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2022 / 08 / 06
Introduce of raw materials for SPC floor production SPC(stone plastic compound)floor is a new type of environmental protection floor, with zero formaldehyde, mildew-proof, moisture-proof, fire-proof, insect-proof, simple installation and other characteristics. Widely used in offices, hotels, business, home and other indoor places. The raw materials be needed to produce SPC flooring are as follows
2022 / 08 / 06
In addition to inorganic fire retardants, certain plants have developed a defense mechanism against fire invasions due to their specific molecular structure. Bio based compounds in these plants owe their intrinsic fire retardancy to the formation of a thermally stable char layer when exposed to fire. A review of bio based flame retardants has been previously published by Costes et al.13 Briefly, char formation mechanism is initiated as the stored water in wood starts to be liberated during thermal decomposition of wood components (lignin, cellulose, etc.). This barrier char layer insulates the underlying wood from further burning by hindering the heat exposure. Biomass is the largest resource for bio-based materials and a massive range of chemicals and biofuels are produced based on biomass derivatives, thanks to their abundant resources and reasonable pricing. The inherent char formation ability of biomass and the resulting fire retardancy makes it desirable for FR applications.61 Up to 75% of biomass is composed of saccharide-based products (e.g. cellulose, hemicellulose, and lignin), while the rest is mostly energy storage components (e.g. starch), proteins, and vegetable oils. Lignin is one of the most abundant bio-based produc
Carbon nanotube flame retardant
2022 / 08 / 06
A wide range of studies have shown that carbon nanotubes (CNTs) either single-walled (SWCNTs) or multi-walled (MWCNTs) are among the most promising alternatives for traditional flame retardants to be used in different polymers, such as, PP, PE, PLA, lignocellulose, epoxy resin.84-88 These studies have demonstrated that adding a small amount of well-dispersed CNTs (<5 wt%) to polymer composites can significantly improve the fire behavior due to their fascinating chemical and physical properties. CNTs have a highly elongated structure with a large aspect ratio. Their specific geometry enables them to create a strong protective network in the condensed phase to protect the underlying polymer from heat. This behavior could result in suppression of heat release rate (pHRR reduction in cone calorimetry) and weight loss rate during the combustion.85, 90 Moreover, low flame spread rate, smoke-suppression, and anti-dripping properties have been reported while incorporating CNTs in different polymers.
2022 / 08 / 06
Geographer is a two-dimensional carbon nano material with outstanding physical properties, such as, electrical properties and excellent thermal conductivity due to its large surface area.93, 94 Recently, graphene flame retardants have shown promising impact on thermal stability of different polymers, mostly because of their insulator barrier effect.95-98 Graphene is mostly prepared by removal of oxygen groups from the surface of graphene oxide (GO) or reduced graphene oxide (rGO).99 The challenge involving the application of graphene nanosheets in the polymer matrix is to achieve a good dispersion. Graphene layers have a high tendency to restack because of their strong Van der Waals forces and π-π interactions.95,
How to solve the problem of bending deformation in the extrusion of u-PVC profile?
2022 / 07 / 30
How to solve the problem of bending deformation in the extrusion of u-PVC profile? Bending deformation of PVC profiles is a common problem in the extrusion process, and its causes are mainly: uneven discharge of material from the mouth die; inadequate cooling of materials and inconsistent post-shrinkage when cooling and shaping; equipment and other factors. 1. Ensure the concentricity and level of the whole line of the extruder, and correct the concentricity and level of the extruder, mouth die, sizing die and water tank at each die change. 2. Assemble the mouth die carefully before starting the machine to make the gap of each part consistent. If the uneven material discharge from the mouth die is found when starting the machine, adjust the temperature of the mouth die according to the bending and deformation direction of the billet to ensure the uniform material discharge from the mouth die, if adjusting the temperature of the mouth die is not effective, the plasticization degree of the material can be increased appropriately. 3. Adjust the cooling system of the shaping mold and increase the cooling water on the side of the profile bearing tensile stress. 4. Adjust the method of mechanical offset center, that is, while producing, adjust the positioning bolt in the middle of the shaping mold, and make reverse micro adjustment according to the direction of profile bending (the method should be adopte
2022 / 07 / 30
Profile extrusion is a process by which various plastic materials are used to develop quality plastic products. These products have a continuous cross-section such as pipe, drinking straws, decorative molding, eavestroughing, window trimming and many others. The basic procedure of profile extrusion is that the polymer is melted into a hollow mold cavity, under the influence of high pressure. Process of Profile Extrusion A wide range of special profile extrusion equipment are used to carry out this process effectively. In this process, first the plastic (pellet form) is fed into the machine hopper / extruder. Along with this, the material is constantly conveyed in the forward direction by the way of rotating screw which is placed inside the heated barrel that is being regularly softened by friction as well as heat. Then, the softened plastic is thrown out via a die, straight in the cool water that solidifies the product. From this point, it is conveyed to take-off rollers that actually pull the softened plastic from the die. The die is basically a metal plate which is placed at the extruders' end with a section that is cut out of its interior. This cutout along with the speed of take-off rollers are the two major factors that determine the final cross-section of manufactured product.
2022 / 07 / 30
With the advent of nanotechnology in the past few decades, the prospects of nano scale fillers in polymer-based composites in the flame retardancy applications have progressed rapidly. Although nanofillers do not show excellent fire retardance inherently, incorporation of low amount of them in polymer composites tend to provide drastic improvement in thermal stability, smoke release amount, peak heat release rate and the speed at which flames spread throughout the nanocomposites. The main mechanism of fire retardancy for nanocomposites, which happens in the condensed phase, depends on different factors including structure and chemical composition of the nanofiller. In general, the presence of nanofillers in polymer matrix can alter the overall response of nanocomposites during exposure to flame. A list of most commonly used nanofillers in nanocomposites with the aim of fire retardant is summarized in Table 2. TABLE 2. List of common nano flame retardants in polymer composites Nanofiller
2022 / 07 / 30
Zinc oxide (ZnO) is one of the most popular photocatalyst metallic compounds because of its advantages, such as, cost efficiency, numerous active sites, high surface reactivity, and low environmental impacts. In fact, it is listed as safe by the US Food and Drug Administration given that zinc is an essential trace element. ZnO particles have high thermal conductivity as well as great heat capacity. Therefore, incorporating them into polymeric compounds will result in absorbing the heat transmitted from the surroundings and retarding the direct thermal impact to the polymer backbone. In other terms, they act as an inhibitor to slow down the flame spread rate. With recent advancements in nanotechnology, nano-sized zinc oxides are among the emerging high-value inorganic products with significant features, (such as, high catalyst effect, effective antibacterial properties, high UV absorption, high thermal and physical stability, and high heat capacity) that have many applications in different industries, such as, cosmetics, plastics, sensors, and semiconductors. It is common to use high concentration of inorganic mineral fillers, such as, Al(OH)3 up to 20 wt% to modify flame retardancy of polyvinyl chloride (PVC). However, it is reported that the addition of only 0.635 wt% of ZnO and 9 wt% of Al(OH)3 combination into PVC can significantly increase the LOI value of PVC nanocomposite (up to 30%). This observation was more likely due to the formation of crosslinked surface modified ZnO in polymer matrix, which accelerate the nucleation process and improve the heterogeneous nucleating ability in the cros
2022 / 07 / 30
Nanoclays are ubiquitous nanofillers that are isolated from naturally occurring clays through energetic stirring, followed by centrifugation and freeze-drying, centrifugation and cross-flow filtration, or ultracentrifugation. Nanoclays are composed of stacked mineral silicates layers, forming complex clay crystallites. Three main mechanisms have been reported for fire retardancy in composite materials containing clay particles, including migration, barrier, and paramagnetic mechanisms. In the combustion process of the composites containing clay particles, the bubbles that are formed during polymer degradation push the clay nanoparticles from interior layers to the surface of the composites. The clay migration to the outer surface could be attributed to different factors; the difference in surface free energy between polymer and polymer-clay blend, the temperature and viscosity gradient during directional heating, and the formation of rising gasses during combustion process. The aggregation of clay particles results in more hydrophilicity (i.e. less compatible with common hydrophobic matrices) due to the degradation of the organic treatment on the clay interlayers. Consequently, a clay-rich barrier layer will form and reduce the rate of weight loss in the composite combustion. Barrier mechanism during the condensed phase suggests the formation of a char layer in composites containing clay particles while exposing to fire. The insulating char barrier prevents the mass transfer of degradation products to the combusting polymer surface. This, in turn, would limit further exposure to heat and oxygen
Plastic Extrusions: What Are They?
2022 / 07 / 30
Plastic extrusions, sometimes referred to as plastic profiles or sections, are used widely and across a range of sectors including construction, manufacturing, transport, retail and events. However little is known about what a plastic extrusion actually is or how it's made. In broad terms, extrusion implies a pushing out action. In this context it refers to the process of that is involved in creating the plastic tube, angle or edge trim through combining raw plastic with a die through a melting process in order to achieve the desired shape. What is the extrusion process? The process behind a plastic extrusion can be broken down into three steps. 1. Mixing 2. Melting and extrusion 3. Shaping and cooling Stage 1: Mixing The first step is to mix all raw ingredients for a plastic extrusion. Raw plastic, typically in the form of compound, is first fed into a long barrel-shaped extruder. At this stage, any additives for the plastic extrusion, such as colourants, can be added according to the required specifications. Stage 2: Melting and Extrusion The second step of plastic extrusion is to melt the ingredients together. Along the barrel there are heating zones strategically positioned to melt the plastic material gradually, reducing the risk of overheating and degrading the polymer. Further heat is then generated through friction from a rotating screw. The molten plastic emerges at the end of the barrel and is subject to filtration to ensure that no contaminants are present in the final product. After this the plastic extrusion will take its final shape (last stage) Stage 3: Shaping and Cooling The last step of plastic extrusion is shaping and cooling. The molten polymer is then forced into a die, which attributes the
PVC and uPVC - What's the Difference?
2022 / 07 / 30
Polyvinyl chloride or PVC plastic is one of the most used plastics in the world. It is incredibly versatile and found in an endless array of products that impact our everyday lives, and is suitable for recycling. PVC is particularly used for building and construction but also plays an important role in health, transport, packaging as well as art and fashion. Rigid and flexible PVC plastic PVC plastic comes in two main forms: rigid and flexible. To attribute it a flexible nature, plasticisers are added to PVC. In this way, the 'u' in 'uPVC' stands for unplasticised and uPVC plastic retains rigidity. Unplasticised polyvinyl chloride (uPVC plastic) Rigid uPVC is often used externally as it is more resistant to weathering and isn't susceptible to biological decomposition. In addition, it retains its shape at normal temperatures, though it can be reshaped under intense heat. It features prominently in construction, particularly in windows. However in the double-glazing and windows industries, additional stabilisers are often added to the uPVC, which are not used on our uPVC products. uPVC can also be used internally. For example, it provides a durable edge protection to boards, panels and other applications. Flexible polyvinyl chloride (flexible PVC plastic) On the other hand, flexible plasticised polyvinyl chloride is durable and used for a number of internal applications. Our flexible profiles are often used for domestic applications such as edge protection and cover strips for boards, panels, furniture and worktops amongst others.
2022 / 07 / 30
Profile ExtrusionTypical Raw Materials For Plastic Profiles: - HDPE (High Density Polyethylene) - LDPE (Low Density Polyethylene) - LLDPE (Linear Low Density Polyethylene) - PETG - Flexible PVC - Butyrate - Polypropylene - Polystyrene - ABS Advantages And Disadvantages of Profile Extrusion The only main disadvantage of the profile extrusion is the limitations in the design possibilities, which is due to the linear nature of the process. It has various advantages as well that are as follows: - Equipment widely available in all geographical areas - Relatively low tooling costs - Inexpensive process - Product combinations possible - Design freedom Typical Applications & Design Possibilities There are number of applications where the process of profile extrusion is extremely useful. Also, there are many design possibilities with the use of this process. Typical applications and design possibilities of the profile extrusion process are as follows: - Windows profile - Sealing sections - Modular drawer profiles - Decorative trim
2022 / 07 / 30
Do you remember as a kid shoving play dough into the red and yellow toy to squeeze out a [rope" shaped like a star or a flower? Well, that defines Extrusion: a process used to create objects of a fixed cross-sectional profile. Commonly extruded materials include metals, polymers, ceramics, concrete, modeling clay, and foods, such as macaroni and cheese puffs. Here we will focus on the high output use of plastic extrusion to form plastic parts that we use on an everyday basis and for industrial and medical processes. Plastics Extrusion in advanced manufacturing is not simply choosing different colors to push through several basic shapes- Custom Plastic Extrusion can combine the properties of advanced materials to enable specific performance characteristics for plastic tubing or plastic parts, and can form multi-lumen tubing or complex profiles to fit a wide range of applications for commercial, industrial, food processing, filtration, automotive, military and medical/pharmaceutical industries. The extrusion process starts by feeding plastic material (pellets, granules, flakes or powders) from a hopper into t
HOW FUSION IS PROMOTED BY PROCESS AIDS?
2022 / 07 / 29
ntroduction: Process aids (PA) are unique additives that dramatically improve the processability of PVC, at relatively lower concentration. Besides, they are used to achieve processing improvements, higher productivity, and better product quality. Nature of process aids: Process aids are random copolymers, whose major component is methyl methacrylate. Other component may be styrene or acrylonitrile. They are PVC compatible. Process aids are produced by emulsion polymerization. Processing aids have two categories – 1. That promotes fusion and adds rubber elasticity during processing, and 2. That adds lubricity during processing. Processing Aids that promotes fusion – They are acrylic polymer, high molecular weight MMA copolymers (MMA / styrene) or Acrylonitrile styrene. Modified rheology (Viscosity & Elasticity) and morphology (how primary particles arrange – fuse together) of PVC compound during processing is a function of molecular weight of process aid.
2022 / 07 / 29
AIM – Acrylic Impact Modifiers Acrylic impact modifiers (AIM) with varying ranges in gloss and impact capability are available, including one-packs with process aids. We stock many grades of acrylic impact modifiers depending on your exact needs. Under the right circumstances it is also possible to customize a new product for a customer based on their needs. Acrylic impact modifiers for clear applications are available as well. CPE – Chlorinated Polyethylene Rigid grade chlorinated polyethylene impact modifiers (CPE) products produced with unique practices to provide superior performance at competitive pricing. Traditionally, chlorinated polyethylene impact modifiers are used in non-weatherable applications. In some instances, CPE can serve the dual function of a process aid as well as an impact modifier. Multiple chlorinated polyethylene impact modifier products are available, some with extremely high elongation for niche applications. MBS – Methyl Methacrylate Butadiene Styrene Polymer Methyl Methacrylate Butadiene Styrene polymer (MBS) impact modifiers, provide superb cold temperature impacts for extrusion, injection molding and calendering. Due to its composition, a MBS impact modifier is used in non-weatherable applications. Both clear and opaque versions of MBS impact modifiers are available.
2022 / 07 / 29
Specialized processing techniques,Weifang we supply the industry leading ultra-high molecular weight plastic processing aids, PVC process aids, acrylic processing aids, and more. We offer traditional acrylic and plastic process aids to complement the UHMW, LMW, and MMW products. LMW: These lower molecular weight process aids primarily provide metal release and are used in all PVC manufacturing processes for clear and opaque products. Grades with FDA approval are also available. MMW: These process aids can aid in fusion, metal release and melt strength. They are available in varying molecular weight ranges. Can be used in all PVC manufacturing processes for clear and opaque products. Grades with FDA approval are also available. UHMW: Ultra high molecular weight process aid products that provide excellent melt strength as well as significant usage reductions. These are products are targeted for cellular PVC applications.
Flame retardant is indispensable
2022 / 07 / 23
In order to meet fire safety requirements and diminish fire hazards, different solutions have been developed. Various chemical and physical strategies have evolved to prevent polymers from burning or to lower the heat release amount. Recently, flame retardants (FRs) have been widely recognized as fire safety tools capable of lowering the number of fire injuries and death. The term flame retardant refers to a diverse group of chemicals that are added to synthesis materials, such as, plastics to prevent or slow down the combustion process. Adding flame retardants to polymers, fibers, and papers are an expanding trend that can protect the final product from burning. Therefore, it is clear that flame retardants are an important part of polymer composite formulations. Role of FRs is significant for those cases that polymers have a high chance of being exposed to the ignition source (like in electronics and electrical applications), and those where polymers can ignite and spread fire quickly (like in residential and industrial buildings, limiting evacuation, and transportation). Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market.
2022 / 07 / 23
According to their specific mechanisms, fire retardants interrupt polymer pyrolysis in one or more steps. Three of the most common flame retardancy mechanisms are described in previous studies. Gas phase inhibition mechanism, where the FRs react with the polymer under combustion in the gas phase with hydroxyl or oxygen agents at the molecular level and extinguish the combustion. Halogenated and phosphorous FRs are common in this category. Hydrated minerals (halogen free) decompose in an endothermic reaction when exposed to fire, using a cooling mechanism. They release water molecules that cool down the combustion environment of polymers. Char forming polymers (e.g. cellulose or carbon family FRs) react to combustion in a solid phase. these FRs crosslink to the polymer matrix in elevated temperatures and create a barrier layer that hinders the heat transfer and release of additional gasses. They react to form a porous carbonaceous 3D-char layer that insulate the polymer surface and slow down the pyrolysis. Intumescent FRs, such as, melamine compounds and phosphorous compounds are from this category. Novista Group supplies equivalent of FP-2100JC, FP-2200S, FP-2500S, Exolit OP1230, OP930, OP1312, OP1314 to global market.
Flammability characterization methods
2022 / 07 / 23
Flame retardancy process can be characterized either in gas phase, by investigating present pyrolysis species, or in solid phase, by studying the morphology and composition of the char layer. There are numerous macro and micro fire characterization methods. Limiting oxygen index (LOI), UL-94, cone calorimetry, microscale calorimetry, and thermogravimetric analysis (TGA) are of the most common fire characterization methods. LOI is one of the primary methods that has been used for many years to investigate the relative flammability of materials. Material with LOI less than 21% can burn easily whereas materials with LOI greater than 21% exhibit reduced flammability after removal from ignition source. LOI requires a cost-effective setup and small sample size. However, due to the high oxygen index simulation and small scale input heat, it is not very suitable for determining the real extent of fire performance. UL-94 tests have been considered for measuring burning rate and characteristics of plastics. UL94 vertical test is widely used for determination of ignitability and flame spread rate of plastic materials. In this test, the specimen is burnt using specific flame conditions for a certain time period. The time required for the fire to be extinguished (after-flame removal) is an indication of fire retardancy properties of the specimen. As one of the most important fire characterization methods for polymeric materials, cone calorimetry measures the reducing oxygen concentration in the combustion gasses of a
2022 / 07 / 16
PVC Modifier Usage advice When the manufacturers adopt PVC modifier Novista system, all formulas keep the same, except the change of ACR, MBS and CPE. According to the original formula of MBS, ACR, CPE and ACM modification system, as per technical requirement of the products, users should adjust the quantity correspondingly to achieve the best using effect. When using products of impact modifier WS-E system, as without adding CPE, users should decrease the quantity of both internal and external lubricant in formula to achieve the best plasticizing effect.
2022 / 07 / 16
PVC Modifier Product futures The PVC modifier has excellent modification effect with less dosage, which conforms to EU ROHS Directive, eco-friendly and without secondary pollution. The impact PVC modifier has good compatibility and doesn`t precipitate, which is the preferred choice of environmental protection efficient modifier in PVC industry. The PVC impact modifier has good modification effect, excellent processing performance, make the products appearance gloss improved greatly, with moderate hardness and the synergistic effect of thermal stability enhanced. It also have functions of antioxidant and light stability, which can improve the weather resistance and heat resistance of various PVC products. To adopt the modifier of acrylic modification, fundamentally changed the current CPE modified method, which is in line with international advanced technology. It can decrease the rest chlorine of CPE products erode screw and other equipments.
Impact Modifier MBS Resin For PVC
2022 / 07 / 16
MBS additives are commonly known as MBS resin. As one of the most important impact modifiers of PVC, MBS resin can maintain the transparency of PVC at the same time as toughening, and at the same time, compared with other impact modifiers, Can be more substantial to enhance the toughness of products, which is widely used in PVC and PBT / PC and other engineering plastics processing applications. MBS resin is a functional polymer material synthesized on the basis of particle design concept. It is a ternary polymer prepared by emulsion graft polymerization. The submicron morphology has a typical core-shell structure. The core of the particle is that it is subjected to mild crosslinking With a low shear volume of styrene-butadiene rubber core, mainly to improve the role of polymer impact toughness. The shell is the hard shell formed by grafting styrene and methyl methacrylate. The main role of MMA in the shell is to improve its compatibility with PVC, so that MBS can be uniformly dispersed in PVC body; St is mainly to improve the MBS Resin refractive index to MBS has a similar refractive index with PVC, so MBS resin is a typical particle dispersion toughening modifier. It is semi-compatible with PVC two phases, that is, with PVC resin has a good interface compatibility, but also in the PVC / MBS system to maintain the integrity of the particle shape. MBS added a small amount of good dispersion in the PVC ball particles, not a decentralized "sea - island" structure, can not achieve the role of impact energy, material toughening effect is not good. With the addition of MBS resin, the dispersed particles gradually coalesce to form the island structure. When the material is subjected to external impact, the rubber core in the MBS resin is the stress concentration point, causing it to deform, and in the surrounding induced crazing and shear zone, through the crazing and shear zone to disperse and absorb the impact energy, forming the material From brittle fra
Different Products Require Different Chemical Compounds
2022 / 07 / 16
Not all flame retardants are the same. Plastics and other materials where flame retardants are used are widely different in their inherent properties and in roles they serve in their products. Similarly, flame retardants are a widely diverse set of chemicals that vary by functionality and application. They all help to inhibit or suppress fire ignition - no ignition, no fire. Specific flame retardants are included in electronics products based on product attributes, properties, use, and potential ignition threats. Novista Group supplies equivalent of FP-2100JC, FP-2200S, FP-2500S, Exolit OP1230, OP930, OP1312, OP1314 to global market.
Common mistakes in the use of flame retardants
2022 / 07 / 16
Misunderstanding 1: The larger the amount of flame retardant, the better the flame retardant effect. The limiting oxygen index (LOI) and UL-94 test results show that the flame retardant performance of the material is related to the flame retardant dosage. With the increase of flame retardant content, the flame retardant effect first increases and then decreases. Too much flame retardant can have a significant impact on the mechanical properties of the material. Misunderstanding 2: The higher the flame retardant rating, the better. In general, people always want their materials to have a higher flame rating. However, in fact, various flame retardant test methods have limitations, and their conclusions are relative. For example, UL94 V-0 is better than V-2, however, some electrical products require arc ignitable materials and V-2 is better than V-0. Since V-2 plastic does not form conductivity and coke under the action of electricity, the possibility of fire is greatly reduced, but V-0 plastic is the complete opposite. Novista Group supplies DBDPE, BDDP, FR245, TTBP,SR130 to global market.
Send Inquiry
Mr. Ron Han
Tel:86-536-8206760
Fax:86-536-8206750
Mobile Phone:+8615336365800
Email:manager.han@novistagroup.com
Address:RM1232-1233,#4 Building No.4778 Shengli East Street, Weifang, Shandong
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.