1. Hot spot of solid calcium-zinc composite
Heat Stabilizer Environmental protection (relative to lead, cadmium, tin, antimony).
Odorless or low-odor (relative to organotin and liquid calcium-zinc), the odor of organotin is derived from mercaptan, liquid calcium-zinc, antimony-zinc stabilizer may be derived from short-chain acid and low-boiling solvent, solid calcium-zinc does not exist these questions.
Solid assisted stabilizer technology has developed rapidly (relative to liquid calcium and zinc), especially the use of auxiliary stabilizers represented by hydrotalcites and polyol esters, which has solved the problem of zinc burning.
Calcium-zinc stabilizers have made great progress in performance and cost, especially in the hard field. As the formula continues to improve, the cost is decreasing, the performance is improving, and the price has gradually approached the lead salt.
2. Formulation system of solid calcium and zinc
According to the principle of primary stabilizer and secondary stabilizer, zinc soap in the calcium-zinc composite heat stabilizer is used as the main stabilizer, while calcium soap is used as the secondary stabilizer. In fact, as the secondary stabilizer, hydrotalcite, zeolite, Polyol (ester), antioxidants, and the like. Therefore, the calcium-zinc composite heat stabilizer should be strictly referred to as [organic zinc composite heat stabilizer", and the common formulation system of solid organic zinc composite heat stabilizer (without hydrazine) has the following structures:
---Zinc soap + calcium soap + other;
---Zinc soap + hydrotalcite + other;
---zinc soap + zeolite + other;
---Zinc soap + polyol (ester) + other;
---Zinc soap + antioxidant + other;
3. Application classification of powdered calcium and zinc
According to heat resistance grade: soft / hard
According to the influence of PVC transparency: opaque / transparent / high transparency
According to the processing method: extrusion / injection / calender / plastic coating, etc.
According to the application area: cable / leather / toy / profile / pipe / pipe / sheet, etc.
According to product color requirements: dark / light color
According to different requirements of customers: such as the pursuit of initial type / long-term type
Consider cost requirements
4, One Pack features
Application specificity:
Due to the diversity of raw materials, the diversity of formulation systems and the diversity of PVC applications, formulators design the best cost-effective products for specific products in specific areas, making them competitive.
Sometimes designed as a "stabilizer + lubricant" / "stabilizer + lubricant +
Processing Aid" package, the advantages: less stock of goods, easy to process, reduce mixing cycle, improve consistency and reduce human error.
Disadvantages:
The formula of compound calcium-zinc stabilizer is a system. For customers, the choice of calcium-zinc composite stabilizer is to choose this system, relying on the closeness of technical service between customers and suppliers to ensure the best performance and lowest cost. .
For stabilizer manufacturers, it is easy to maintain existing customers, but the products are not versatile and have a narrow application range.
5, the lubricity of the stabilizer
Calcium and zinc stabilizer lubricity source:
1) Metal soap (calcium, magnesium and zinc)
2) Lubricant
3) Some auxiliary stabilizers
be careful:
1) Under normal circumstances, the composite lead salt has better lubricity than the composite calcium-zinc stabilizer, the solid calcium-zinc lubricity is stronger than the liquid calcium-zinc stabilizer; the liquid calcium-zinc lubricity is stronger than the organotin stabilizer. Different types of stabilizers have different lubricity, and even the stabilizers of different manufacturers of different types of stabilizers have different lubricity, so attention should be paid to lubricity when replacing stabilizers.
2) Choose the appropriate lubricant and its dosage, the lubrication is insufficient, the processing is difficult, the stability is lowered; the lubrication is excessive, the plasticization is difficult to be precipitated, and the physical properties of the product are also affected.
6, the amount of stabilizer
Under normal circumstances, the stable dose is increased and the stability is improved.
The total amount of stabilizer is determined according to the processing method. For example, in the twin-screw extrusion process, the amount of stabilizer is smaller than that of the single screw. More injection molding is used than in the extrusion process. Transparent and light colored products are processed at a more stable dose than darker products.
Note: The more the powder transparent stabilizer is used, the lower the transparency.
In addition to meeting the requirements of normal production of the product, the amount of stabilizer should also take into account the improper processing temperature or temperature out of control, accidental parking and so on.
In short, the amount of stabilizer can not only ensure the normal production needs, but also leave room for the material to be seriously decomposed in the event of an accident.
7. Synergistic effect of stabilizers
The solid calcium-zinc stabilizer has good compatibility and coordination with lead, cadmium, tin and antimony stabilizers, and there is no problem of vulcanization pollution.
Calcium-zinc stabilizers have good synergistic effects with
Epoxidized Soybean Oil, phosphites, and organotin.
Stabilizers have a good synergistic effect with lubricants.
8. Mechanism of action of calcium-zinc stabilizer
Related links:|Professional knowledge|Stabilization mechanism of PVC calcium-zinc stabilizer
9. Possible disadvantages of powdered calcium and zinc stabilizers
1) Poor compatibility. As the content of calcium-zinc metal increases, the anion carbon chain grows, and the compatibility is worse, for example, precipitation is easy to precipitate.
2) Easy to absorb moisture. Source calcium soap, polyol, etc.
3) Poor dispersion. The individual components of the source have a high melting point or are easy to agglomerate, and the phenomenon is white spots and scratches.
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10, Our solid
Calcium zinc stabilizer application
Our composite calcium-zinc stabilizer has surface-activated treatment of fatty acid salt, auxiliary heat stabilizer, alcohol ester and anti-aging agent, and then physical assembly. The mixture can optimize PVC processing, and the processing fluidity is good and does not precipitate. The color retention ability is strong, the sulphide resistance is resistant, the surface of the product is bright, and the heat-resisting effect is obviously improved in the later stage.
Its product application coverage areas: automotive wiring harnesses, pipe fittings, doors and windows, wood-plastic panels, calendered packaging, medical accessories, toys, shoe materials, hoses, automotive interiors, curtains, carpets, food conveying equipment, silicone products.
contact more at mandyzhang@novistagroup.com
