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What Are Advantages Of Functional Flame Retardant Masterbatch?
2022 / 09 / 17
1. High flame-retardant efficiency Flame-retardant masterbatch is based on a reasonable formula, through the organic combination of flame retardant, lubricating dispersant and carrier, after mixing and mixing uniformly, it is extruded and granulated. After being mixed with plastics, they are more dense and uniform; Meanwhile, the flame-retardant masterbatch contains a dispersant and high melting index carrier, which means it will be dispersed better, so that every flame-retardant molecule can exert the flame-retardant effect, thereby improving fire resistance efficiency. 2. Diversified functions The main feature of flame-retardant masterbatch is the functionalization of flame-retardant masterbatch. With the advancement of science and technology, equipment and materials are constantly improving, and the functionali
Glass Fiber Reinforced Flame Retardant Nylon Application
2022 / 09 / 03
In nylon with glass fiber, after modification of nylon mechanical properties, dimensional stability, heat resistance, aging resistance, resistance to fatigue strength is not increased 2.5 times, add flame retardant after filling, achieve UL94V0 flame retardant grade, in auto parts, electronic appliances, engineering machinery parts, textile, etc widely used. Properties and characteristics of glass fiber flame retardant nylon -Glass fiber flame retardant nylon reduce water absorption, with high tensile strength, stable product size stability. -Commission modified nylon flame retardant level, with self-extinguishing, to adapt to the high temperature requirements of electronics, electrical, communication and other industries. -Improve the mechanical strength of modified nylon toughness resistance, impact resistance, to achieve the strength of metal materials, replace metal.
4 Types Of Flame Retardant Plastic Additives
2022 / 09 / 03
Therefore it is often necessary to add flame retardant plastic additives to meet governmental and industry regulatory standards. Flame retardant plastic additives are compounds added to plastics and other materials to inhibit, suppress or delay combustion. These compounds are useful in impending burning in the ignition phase of fire. They do not prevent charring or melting nor do they increase the heat resistance of a material. Flame retardants are also not effective when a fire is fully engaged. There is no universal additive for all plastics, rather each flame retardant is specific to a particular polymer and a particular flammability test. To understand how flame retardants work, it is necessary to understand how materials burn. When we see the flame of a burning object, we are actually seeing the combustion of flammable gases given off during its thermal decomposition. This process is call pyrolysis. Pyrolysis is the process in which the long-chain molecules of a polymer chain degrade into smaller hydrocarbon molecules and flammable gases. These gases mix with oxygen and exothermic chemical reactions occur producing free radicals (H and OH). In complete combustion, H2O and Co2 are produced as well as other material specific gases. The way that flame retardants interfere in the pyrolysis of a polymer depends on the flame retardant(s) used and the plastic burned. Flame retardants can be either active or reactive. Active means blended into a polymer and reactive means inserted in the polymer molecule. Both types can suppress ign
World Bromine Resources Distribution And Flame Retardant
2022 / 09 / 03
Bromine is an important chemical raw material, widely used in flame retardants, fire extinguishing agents, refrigerants, photosensitive materials, medicine, pesticides, oil fields and other industries. The natural resources of bromine mainly exist in seawater, underground concentrated brines, sediments of ancient oceans and salt lake water. Bromine content in sea water accounts for 99% of the total global resources, the concentration of bromine is about 65ppm, while salt mine is only 0.1ppm, some areas 200~300ppm (such as underground brine in Laizhou, Shandong Province,China), in some foreign salt lake water 2000 to 12000 ppm The world production of bromine is about 800,000 tons/year. Among them, the annual output of the United States and Israel is more than 550,000 tons, ranking first and second in the world. China's annual output is about 160,000 tons, ranking third. Jordan and Japan are the fourth and fifth largest bromine producers in the world, with small quantities in Ukraine, Azerbaijan, India, Germany, Spain and Turkmenistan. Novista Group supplies DBDPE, BDDP, FR245, TTBP,SR130 to global market.
Fire Protection Effect Of Intumescent Steel Structure Fireproof Coating On Steel
2022 / 08 / 27
Barrier function. The high-expansion carbonized layer can effectively isolate the protected steel structure from air and heat sources, thereby effectively reducing the surface temperature of the steel structure and prolonging the support time of the steel structure in a fire. The heat absorption, softening, melting and expansion of the polymer coating, the physical change of the carbonized layer and the thermal decomposition, evaporation and carbonization of the coating components will absorb a lot of heat, thereby effectively reducing the surface temperature of the steel structure. Suspend combustion. Various incombustible gases decomposed by thermal decomposition of coating components can dilute the oxygen concentration and capture free radicals generated by combustion, thereby effectively preventing combustion. The coordination of these three processes finally makes the intumescent steel structure fireproof coating play an effective fireproof role. Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market.
The Development Prospect And Direction of PP Plastic Flame Retardant
2022 / 08 / 27
The development prospect and development direction of PP plastic flame retardant is a new type of reactive flame retardant containing Br (bromine), P (phosphorus) N (nitrogen) and other elements. Brominated flame retardant Most brominated flame retardants will decompose at 200-300 ℃, this temperature range is also the decomposition temperature range of polypropylene, so when polypropylene is thermally decomposed, brominated flame retardants also begin to decompose, and can capture its The free radicals generated by the degradation reaction, thereby delaying or terminating the combustion chain reaction. At the same time, the released HBr itself is a refractory gas. This gas has a high density and can cover the surface of the material, which can block the flammable gas on the surface and inhibit the combustion of the material. The main disadvantage of brominated flame retardants is that they reduce the anti-ultraviolet stability of the flame-retardant substrate, and generate more smoke, corrosive gases and toxic gases during combustion, which limits their application.
Knowledge Of The Use Of Flame Retardants
2022 / 08 / 27
In general, the flame retardant mechanisms of bromine and chlorine systems are similar. At high temperature, the carbon-halogen bond in halogen-based flame retardants will be damaged, releasing halogen free radicals, which can effectively capture free active free radicals generated by thermal degradation of polymer materials, and can effectively reduce the concentration of free radicals, thereby alleviating or stopping burning free radical chain reaction. In addition, because the released hydrogen halide is not easy to burn, halogen-based flame retardants can effectively block oxygen and suppress the burning reaction. However, when a polymer material containing a halogen flame retardant is incinerated, a large amount of hydrogen halide gas is generated. This gas is toxic and corrosive. At the same time, it also simply absorbs moisture in the air, forming a highly corrosive hydrogen halide acid, along with a lot of smoke. These fumes, toxic gases and corrosive gases will damage human health and bring great obstacles to life-saving, escape and recovery. Flame retardant manufacturers: treated aluminum hydroxide flame retardant aluminum hydroxide, also known as trihydrate oxidation Aluminum (ATH), with the molecular formula Al(OH)3, is one of the earliest inorgani
The main difference between CPVC and PVC
2022 / 08 / 20
The main difference between CPVC and PVC is the range of temperatures each is capable of withstanding. CPVC can handle temperatures up to 200° Fahrenheit, while PVC peaks at 140° Fahrenheit. Above those temperatures, both CPVC and PVC will begin to soften, increasing the risk of joints and pipes failing, and therefore, failing of the plumbing system. The primers, solvent cements, and bonding agents are different for PVC and CPVC due to the differences in the material's chemical composition. For example, CPVC solvent cements must meet ASTM F493 specifications, and PVC solvent cements must meet ASTM D2564 specifications. Because of this, CPVC and PVC pipes and fittings, along with their solvents and bonding agents, should not be used interchangeably. In addition to meeting ASTM specifications, there are different solvent cements required based on the pipe`s size and intended application, so check the product containers to be sure you`re using the correct agent for the correct application. PVC comes in nominal pipe sizes only, while CPVC is available in both nominal pipe sizes and copper tube sizes. CPVC has greater flexibility than PVC, and requires support at three foot intervals to maintain its position. Characteristics and Properties CPVC AND PVC VISUAL SIMILARITIES AND DIFFERENCES PVC pipes are white or dark gray in color. CPVC is off-white, light gray, or yellow in color. Both pipe types have technical specifications printed on the side for easy verification. Both pipe types are available in plain end and bell end. Both come in Schedule 40 and Schedule 80 thickness. Schedule 40 PVC also comes in Class 125 fittings. PVC is available in 10 ft and 20 ft lengths. CPVC is available in 10 ft and 20 ft lengths. Certain diameters of PVC pipe and furniture PVC pipe are now available in 5 ft sections. CPVC AND PVC PROPERTIES Bot
2022 / 08 / 20
1. By improving adhesion in the first step of fusion S-PVC grain (secondary particle) of size 90-250 micron has a hard skin of 0.2 – 1.0 micron. This hard skin makes fusion very difficult. Unless this skin breaks, dispersion of secondary particle to primary particle and in turn fusion cannot take place effectively. During extrusion, some degree of adhesion is necessary to facilitate shearing and convey the material along the flights of the screw. In the initial stages of fusion, PVC tends to exhibit reduced adhesion to it and to metal surfaces. This delays heating and breakdown of the grains. Process aids do not have hard skin like PVC. Due to this reason, when heated under shear and stress, process aids soften earlier than PVC and then adhere to the surrounding PVC particles. Owing to good compatibility with PVC, they transmit elongational and shearing forces to PVC grains. In this way process aids work as shear transfer agents, resulting in faster and uniform breakdown of PVC grains to primary particles (dispersion), leading to faster and uniform fusion. Generally, lower the molecular weight of process aid, lower is the temperature of onset of fusion. 2. By providing longer chains to entangle with PVC chains in the second stage of fusion: Acrylic processing aids have very good compatibility with PVC because of their main component PMMA. They also have higher molecular weight and longer chains than PVC. Thus, when heated under shear stress during processing, entanglement appear between PVC chains and process aid chains resulting in viscoelastic network. These entanglements work as cross links during processing and add rubbery characteristics to PVC compounds enabling increase in drawdown for extrudate or blow up ratio for blown films. Process aid chains are elas
Selection of molecular weight of process aids
2022 / 08 / 20
Improves jetting or gate blush and weld line in injection molded products Eliminates distortion in rolling bank and flow marks in calendaring process, and Improves appearance of PVC foamed products (very high mole weight process aids.) PA that adds lubricity are- Low molecular weight MMA copolymers or acrylic polymers. It can be considered as acrylic waxes. These process aids consist of PVC compatible part and PVC incompatible part. Effect of lubricating acrylic process aids: Improves metal release Prevents plate out, and Are neutral to fusion SAN based process aids: They are based on Poly (styrene – Acrylonitrile) They have higher molecular weight and viscosity than acrylic process aids. They are relatively cheaper. They offer higher surface gloss in opaque products. And, they do not affect VST. Copolymer of styrene – MMA, on the other hand has high molecular weight and high glass transition temp than PVC. Some researchers recommend blend of Acrylic and SAN based processing aids for UPVC injection moulding.
Flame retardant for Transportation industry
2022 / 08 / 20
Preventing fires and extending escape time are of utmost importance when people are in a confined and not easily vacated space. From airplanes to cars to trains, flame retardants can play a key role in protecting travelers from the devastation of fire. After the July 2013 Asiana Airline crash in San Francisco, for example, experts credited flame retardant materials with helping passengers survive the crash. Former FAA Director Steven Wallace told the New York Times that flame retardant materials inside the plane, including foil wrapping under the seats, most likely helped protect many passengers. Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market.
BROMINATED FLAME RETARDANTS: ESSENTIAL USE AND SUSTAINABILITY
2022 / 08 / 20
· The use of plastics in durable goods will continue to rise, and fire safety is an expectation of society important to preserve. · Flame retardants are critical chemistries that help protect plastic components used in the modern built environment. · Brominated polymers provide unique and versatile fire safety solutions. · · NOTE: Chlorinated, fluorinated, phosphorous, and mineral based flame retardants are different in terms of how they work; they are not direct substitutes for brominated flame retardants. · · Novista Group supplies equivalent of FP-2100JC, FP-2200S, FP-2500S, Exolit OP1230, OP930, OP1312, OP1314 to global market.
FLAME RETARDANT INITIATIVES UNDERWAY TO ADVANCE A CIRCULAR ECONOMY
2022 / 08 / 20
In a circular economy, it is important to keep resources in use for as long as possible and recover them at the end of their service life, and to be reused as raw material for new products. The flame retardant industry is committed to seeking ways to advance the circularity of flame retardant chemistries. A recently conducted pilot program shows that it is readily possible to use unique markers to represent specific flame retardants (e.g., brominated flame retardants) for rapid identification even when the brominated flame retardants are formulated into plastics. The project demonstrates that unique marker systems can be deployed to help whole value chains improve traceability and circularity of flame retardants throughout the life cycle of plastic used in consumer products. Waste and Electronic and Electrical Equipment (WEEE) Plastics and Circularity: In December 2018, the European Commission launched the Circular Plastic Alliance with the aim of boosting the EU market for recycled plastic with an initial pledge of 10 million tonnes by 2025 and with more than 230 signatories to date. The recycle of flame retardant containing plastics can aid in reaching this important objective. A report by SOFIES, a leading sustainability consultancy, provides a comprehensive analysis regarding WEEE plastics flows and recycling efforts in Europe. The report presents the successes and overarching challenges in making WEEE plastic streams more circular. Among the findings in the report is that the presence of brominated flame retardants (BFRs) in WEEE plastics does not reduce recycling yields more than other flame retardants in WEEE plastics.
2022 / 08 / 13
Fullerene (C60, aka. buckybull) is a carbon allotrope, which has a spheroidal-shaped structure. Combination of magnificent thermal stability and unique physical and electrical properties of fullerene with popular advantages of polymers has attracted a lot of research interests.101-103 However, only a few studies have focused on fullerene flame retardancy effect of polymers. Fullerene has a high reactivity against free radicals. It can act as a free radical scavenger to trap radicals produced during combustion in the gas and/or condensed phase and delay thermo-oxidative degradation of polymers.104-108 Fullerene nanoparticles have a tendency to agglomerate due to their strong Van der Waals forces and significant specific surface area. This, in turn, can result in poor fire performance of the polymer composite. To this extent, it is important to assure uniform dispersion of fullerene nanoparticles in polymer matrix. Song et al reported successful incorporation of pristine fullerene nanoparticles in PP matrix via melt compounding techn
Cellulose nanofibers flame retardant
2022 / 08 / 13
Cellulose is the most abundant organic polymer, which is found in cell wall of plants as well as in fungi, bacteria, and algae. Cellulose has numerous glucose units with high degree of polymerization based on its extraction method. Figure 4 represents a cellulose fiber organization in a plant cell wall, which is consisted of many cellobiose repeating units.13, 73 Char formation mechanism is very complicated in cellulosic materials. During thermal decomposition, cellulose can produce an insulating char layer under certain specifications, depending on its extraction method and surface treatment. Degradation condition and existing species in the combustion environment govern the amount of produced char and its thermal stability. In low temperatures, degradation of cellulose leads to the formation of anhydrocellulose. As temperature goes up, the remaining cellulose unzips into tar and further anhydrocellulose components and finally proceeds to char and gas formation. Many researches were carried out to improve fire retardancy of cellulose by chemical surface modifications or incorporation of other fire retardants (e.g. phosphorous FRs). These attempts proved to furthe
Metallic and non-metallic particles flame retardant
2022 / 08 / 13
Metallic nanoparticles have received considerable attention for their applications as flame retardants in different polymer matrices. Metallic nanoparticles exhibit different reaction mechanisms against fire according to their structure; some metal nanoparticles (metal hydroxide particles) utilize hydrated minerals and release water molecules as they decompose in the presence of fire and provide an endothermic reaction. In this case, the cooling effect would increase the self-extinguishing ability in nanocomposites. Aluminum tri-hydroxide (ATH) and magnesium hydroxide (MH) are two non-halogen fire retardant additives that undergo endothermic reaction and interfere with the combustion process when exposed to heat (Equation 6 and Equation Incorporation of the metal hydroxide nanoparticles in polymer composites would result in a noticeable increase in limiting oxygen index (LOI). This phenomenon is due to yielding a barrier on the polymer surface, which in turn can lower the heat flux provided by flame and improve the fire retardancy. The formation of char is another mechanism in some fire retardant materials, such as, alumina trihydrate (ATH) that delays ignition and fire development.41 In addition, some metal hydroxide FRs release water when de
2022 / 08 / 12
Polyvinyl Chloride (PVC) is one of the most widely used polymers in the world. Due to its versatile nature, PVC is used extensively across a broad range of industrial, technical and everyday applications including widespread use in building, transport, packaging, electrical/electronic and healthcare applications. PVC is a very durable and long lasting material which can be used in a variety of applications, either rigid or flexible, white or black and a wide range of colours in between. The first patent for a polymerisation process to manufacture PVC was granted to German inventor Friedrich Klatte in 1913 and PVC has been in commercial production since 1933. The material now accounts for about 20% of all plastic manufactured world-wide, second only to polyethlene. 1 Production The essential raw materials for PVC are derived from salt and oil. The electrolysis of salt water produces chlorine, which is combined with ethylene (obtained from oil) to form vinyl chloride monomer (VCM). Molecules of VCM are polymerised to form PVC resin, to which appropriate additives are incorporated to make a customised PVC compound . How is PVC Made.jpg The PVC production process consists of 5 steps: - The extraction of salt and hydrocarbon resources - The production of ethylene and chlorine from these resources - The combination of chlorine and ethylene to make the vinyl chloride monomer (VCM) - The polymerisation of VCM to make poly-vinyl-chloride (PVC) - The blending of PVC polymer with other materials to produce different formulations providing a wide range of physical properties. 1.1 Raw Materials PVC takes less non-renewable fossil fuel to make than any other commodity plastic because unlike other thermoplastics wh
2022 / 08 / 12
1.2 Bi-Products Products and bi-products of PVC manufacture include Chlorine and Caustic Soda, two of perhaps the most important manufacturing "ingredients" not only for PVC manufacture, but many other applications. Chlorine is used in the manufacture of life-saving medication, indeed 85% of all pharmaceuticals. Caustic Soda too has many key, everyday applications, including the following applications: pulp and paper manufacture, soap and surfactant manufacture, detergents and cleaners, aluminia extraction, textiles and in the food industry 2 Physical Properties Type Product Tensile Strength 2.60 N/mm² Notched Impact Strength 2.0 - 45 Kj/m² Thermal Coefficient of expansion 80 x 10-6 Max Cont Use Temp 60 oC Density 1.38 g/cm3 2.1 Resistance to Chemicals Type Product Dilute Acid Very Good Dilute Alkalis Very Good Oils and Greases Good (variable) Aliphatic Hydrocarbons Very Good Aromatic Hydrocarbons Poor Halogenated Hydrocarbons Moderate (variable) Alcohols Good (variable) 3 PVC and Additives Before PVC can be made into products, it has to be combined with a range of special additives. These additives can influence or determine a number of the products properties, namely; its mechanical properties, weather fastness, its colour and clarity and indeed whether it is to be used in a flexible application. This process is called compounding. PVC's compatibility with many different kinds of additives is one of the materials many strengths and is what makes it such a highly
2022 / 08 / 12
3.2 Optional Additives These optional additives are not strictly necessary for the integrity of the plastic but are used to draw-upon other properties. Optional additives include processing aids, impact modifiers, fillers, nitrile rubbers, pigments and colorants and Flame Retardants. 4 Benefits of PVC PVC has excellent electrical insulation properties, making it ideal for cabling applications. Its good impact strength and weatherproof attributes make it ideal for construction products. PVC has extensive European food contact and medical approvals PVC is easy to process, long lasting, tough and light PVC consumes less primary energy during production than any of the other commodity plastics PVC uses less primary energy Source: Software GaBi 4 Database - PE Europe With high clarity and excellent organoleptic properties (no transfer of taint to food) it is equally suited for use in short term applications such as specialised packaging. PVC has a relatively small carbon footrpint, the below infographic indicates the CO2 impact PVC compared to other products Carbon Footprint of PVC PVC windows help to cut energy bills and PVC-based windows account for most BFRC `A` Rated Energy Efficient Windows PVC is fully recyclable. Due to its properties it reprocesses well and can be recycled into second (or third life) applications with ease. 5 Applications PVC is a versatile material that offers many possible applications, these include; window frames, drainage pipe, water service pipe, medical devices, blood storage bags, cable and wire insulation, resilient flooring, roofing membranes, stationary, automotive interiors and seat coverings, fashion and footwear, packaging, cling film, credit cards, vinyl records, synthetic leather and other coated fa
2022 / 08 / 12
5.2 Healthcare PVC in Healthcare PVC has been used for hundreds of life-saving and healthcare products for almost 50 years being used in surgery, pharmaceuticals, drug delivery and medical packaging due to its unrivalled performance characteristics and cost-efficiency. Typical examples of PVC healthcare products include: "Artificial skin" in emergency burns treatment Blood and plasma transfusion sets Blood vessels for artificial kidneys Catheters and cannulae Blood bags Containers for intravenous solution giving sets Container for urine continence and ostomy products Endotracheal tubing Inflatable splints Surgical and examination gloves Shatter-proof bottles and jars Overshoes Protective sheeting and tailored covers Mattress and bedding covers Wall and floor coverings Blister and dosage packs for pharmaceuticals and medicines Flexible PVC is used to make blood storage bags, and in fact is the only material approved by the European Pharmacopoeia for this purpose. The nature of the material means that blood can be stored safely for longer. PVC Pharmaceutical PackagingPVC packaging is also widely used in the packaging of pharmaceutical products. Other examples of PVC healthcare products: "Artificial skin" in emergency burns treatment, blood and plasma transfusion sets, blood vessels for artificial kidneys, catheters, blood bags, containers for intravenous solution giving sets, container for urine continence and ostomy products, endotracheal tubing, feeding and pressure monitoring tubing, inhalation masks, surgical and examination gloves, shatter-proof bottles and jars, mattress and bedding covers a
2022 / 08 / 12
6 PVC and Sustainability PVC's contribution is by no means limited to its products. The PVC industry is also setting a unique example in the process of working together as a supply chain in driving forward sustainable development. There are many definitions of Sustainability and Sustainable Development, but it can best be defined by the three main pillars of sustainability; social, economic and environmental. "Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs." Economic Sustainability The PVC industry has enduring pre-war origins and employs huge numbers of people worldwide across the supply chain, which is spread between large multinationals and SME's making a significant contributing to the growth of the global economy . Social Sustainability: Companies offer rewarding, long-term employment opportunities (including training opportunities), with safe working environments and whose products contribute to good quality homes, through energy efficient windows to the safe transportation of drinking water. Generally, PVC products are light-weight to install - thus a potential for fewer accidents, but far from just providing the windows and pipes for your property, cabling, ducting, roofline products are usually PVC. Environmental Sustainability In terms of environmental sustainability there are common elements in all studies (on PVC and other materials) consistent with reducing human impact on eco-systems: With world population over over 7 Billion and growing we need to conserve scarce resources and we should minimise `human` land-usage in order to protect biodiversity by giving priority to essential uses (
2022 / 08 / 12
6.3 Eco-profiles & Life Cycle Assessment On behalf of the European Commission, and as part of a full review of PVC, PE Europe Consulting Group together with the University of Stuttgart undertook a Life Cycle Assessment of PVC and of Principal Competing Materials. The report, published June 2004, showed PVC products to be comparable to alternatives in their environmental impact. The report can be downloaded from the Europa website. Eco-profiles provide environmental analysis for a product from 'cradle-to-gate' (as opposed to the 'cradle-to-grave' approach of Life Cycle Assessment). Eco-profiles of PVC were updated in 2006 and can be downloaded from the PlasticsEurope Eco-profiles webpages. 6.4 Total Cost of Ownership Study In 2011, the European Council of Vinyl Manufacturers (ECVM) commissioned an independent company to undertake a study on the Total Cost of Ownership (TCO) of PVC products. A Total Cost of Ownership study takes into account all costs associated with a product over its entire life cycle. The study focussed on three particular applications; windows, flooring and outdoor pipes, utilising data from Germany and Italy (judged to be a fair representation of conditions in north and south European countries). The study concluds that not only does PVC provide decisive cost advantages due to its low initial purchase price but also in its low cost of ownership throughout the life of the product. (THE END)
2022 / 08 / 06
What is impact modifier? Impact modifier is a chemical that can improve the low temperature embrittlement of polymer materials and gives them higher toughness. Pure PVC resin is a hard and brittle material with poor impact strength, its generally only 3-5 kJ/m. Especially, it has poor impact performance at low temperature and poor weather resistance, which limits its application in many fields. Therefore, it is necessary to add impact modifier to improve the toughness and weatherability of PVC. The technology of blending impact modifier in PVC polymer can effectively toughen brittle rigid PVC. This impact modifier is a kind of polymer elastomer with certain compatibility with PVC. It can not only keep the high modulus and rigidity of UPVC, but also greatly improve its notch impact strength and obviously improve its low temperature impact strength. Because the mixing process of blending modification method is simple and flexible. At present, common UPVC impact modifiers are chlorinated polyethylene (CPE), polyacrylate (ACR), ethylene- vinyl acetate copolymer (EVA), methyl methacrylate-butadiene-styrene terpolymer (MBS) and acrylonitrile- butadiene-styrene copolymer (ABS), which belong to rubber elastomer impact modifier.
common foaming agents for rubber and plastics
2022 / 08 / 06
1. Azodicarbonate, AC blowing agent,ADC foaming agent Usage: suitable for PE, PVC, PS, PP, ABS, etc. The decomposition temperature of AC blowing agent is high, and the bubbles produced are uniform and compact. It is suitable for all kinds of foaming products, such as closed cell foam, atmospheric or pressurized foaming body, thick or thin foamed body, etc. Such as PVC and plasticized paste foam, polyolefin calendering and moulding foam, foamed artificial leather, etc. 2.Foamer H,Blowing agent H,Foaming agent H,N, N'-dinitrosopentamethylene tetramine; It is mainly used for manufacturing sponge rubber and polyvinyl chloride in plastics. Large amount of gas and high foaming efficiency. 3. p-toluene sulfonyl hydrazide, Foaming agent TSH, Usage: This product is a low-temperature foaming agent, suitable for PVC and other plastics and rubber. It is especially suitable for manufacturing closed-cell foam plastics and sponge rubber. This product can not be used with blowing agent H, because the reaction of these two blowing agents produces a lot of heat, which can lead to internal burning of the product. This product should not be used with lead salt to avoid the precipitation of black lead sulfide.
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