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These applications of talcum powder in the plastics industry must be clear!

Release time:

2024-01-29 09:38

滑石粉在塑料行业中的这些应用,必须得清楚!

 

1. Application in polypropylene resin

 

Talcum powder is commonly used to fill polypropylene. Talcum powder is characterized by a flake-like structure with a flake-like configuration,Therefore, talcum powder with fine particle size can be used as a reinforcing filler for polypropylene. In the modified system of polypropylene, the addition of ultrafine talc can not only significantly improve the rigidity, surface hardness, heat creep resistance, electrical insulation, dimensional stability of polypropylene products, but also improve the impact strength of polypropylene. Adding a small amount of talcum powder to polypropylene can also play the role of nucleating agent, improve the crystallinity of polypropylene, so that the mechanical properties of polypropylene are improved, and the transparency of polypropylene can be improved due to the improvement of crystallinity and grain refinement.

 

Polypropylene composites filled with 20% and 40% superfine talcum powder can significantly improve the rigidity of polypropylene and the creep resistance at high temperature, both at room temperature and high temperature.In the automobile industry, polypropylene added talcum powder is mainly used for bumpers and instrument panels of automobiles, and is also used for fan covers, heater covers, ducts, battery heat protection plates, fluid pumps, etc. In the aircraft industry, it is used for refrigerator door gaskets, heaters and vacuum pump covers, washing machine stirrers; in the electrical industry, it is used for injection molding of various instrument housings and electrical components.

 

2. Application in polyethylene resin

 

Talc is a natural magnesium silicate, its unique micro-scale structure, with a certain degree of water resistance and a high degree of chemical inertness,Therefore, it has good chemical resistance and sliding properties. It filled with polyethylene can be used as engineering plastics, has good chemical resistance and fluidity, can compete with ABS, nylon, polycarbonate. Filling polyethylene with it can improve the following properties: improve toughness, flexural modulus and torsion modulus, improve flexural strength, reduce creep tendency at room temperature and high temperature, improve thermal temperature and dimensional stability, improve deformation and warpage; At the same time, it also has a lower thermal expansion coefficient, improve thermal conductivity, improve surface hardness and smoothness of molded parts, and improve the mechanical strength of polyethylene.

 

Adding different proportions of talcum powder will have different effects on the physical properties of polyethylene materials,The best addition ratio is 10-15%.For polyethylene blown film, filling superfine talcum powder masterbatch is better than other fillers, easy forming and good processability. Moreover, this kind of film can reduce the oxygen transmission rate by 80%, and is especially suitable for packaging oily foods, such as peanuts, broad beans, etc., and can keep oil and deterioration for a long time: this kind of film can reduce the water vapor transmission rate by 70%, has good moisture resistance, is very suitable for underground geotextile moisture-proof cloth, and is also suitable for packaging food.

 

3. Application in ABS resin

 

ABS resin is an amorphous polymer with excellent molding processability like polystyrene; it has good impact strength, good low temperature resistance, high tensile strength and good creep resistance. In order to improve the existing performance of ABS, people have studied the modification of ABS.

 

Because ABS is an amorphous polymer, it has the function of accommodating more fillers.The addition of superfine talcum powder can not only significantly improve the performance of the original ABS, but also reduce the cost.. Therefore, it is mostly used for injection molding of various instruments, televisions, tape recorders, mobile phones and other housings. Of course, it is also widely used in other fields such as textile equipment, electrical parts, automobile parts, aircraft parts, etc.

 

4. Application in polystyrene resin

 

Unmodified general-purpose polystyrene is an amorphous polymer. It is hard and brittle, but it has good electrical properties, aging resistance and high dimensional stability. The disadvantage is high brittleness and sensitivity to environmental stress cracking.The addition of superfine talcum powder can improve the impact toughness, adjust the rheology, the disturbance modulus is significantly improved, and the tensile yield strength is also improved.For example, by adding 40% superfine talcum powder or talcum powder masterbatch, the distortion modulus increased from 23800kg/cm2 to 58800kg/cm2, and the tensile strength increased from 336kg/cm2 to 385kg/cm2.

 

滑石粉在塑料行业中的这些应用,必须得清楚!

 

5. Application in nylon resin

 

For nylon (polyamide), special attention is paid in the industry to take advantage of the toughness and abrasion resistance of this plastic. Nylon is generally hard, similar to horny, with good abrasion resistance and high dimensional stability. These properties can be further enhanced by fillers or reinforcing agents. Among all kinds of fillers, the talc powder with layered structure can improve the original good performance of nylon, and the improvement of wear resistance is the most important. Compared with metal, unfilled modified nylon has low elastic modulus, low tensile and creep strength, obvious dependence on temperature in mechanical properties, high water absorption rate, high water absorption rate, easy water swelling and deformation of products in use, incomplete cooling and rapid crystallization during processing and molding, and crystallization during use, which leads to deformation and even cracking of products.

 

The above shortcomings of nylon, adding superfine talcum powder can be greatly improved,Talcum powder has the effect of nucleating agent, which can improve the crystallization rate of nylon and increase the degree of crystallinity. Therefore, it can improve the toughness, mechanical strength, hardness, thermal stability and dimensional stability of nylon, improve the surface quality and deformation behavior of products, and also have a good effect on moisture absorption, electrical properties and chemical properties.

 

6. Application in PVC resin

 

Filling polyvinyl chloride with ordinary powder has been widely used. For example, when making hard polyvinyl chloride pipes, the amount of calcium carbonate filled can reach 40%, but the tensile strength and impact strength of polyvinyl chloride should be reduced. If talcum powder with an average particle size of 5 microns, I .e. 2000, is added to 40-45% by volume, it can be found that the yield strength of the material is even higher than the original fracture strength, which has obvious reinforcing effect on the polyvinyl chloride system.With respect to the impact strength, the addition of the ultrafine talc powder did not substantially decrease the unnotched impact strength within 15% by weight, decreased the notched impact strength, and significantly increased the disturbed modulus.Ultrafine powders have a very significant reinforcing effect on PVC systems with toughening agents, such as PVC/CPE and PVC/ABS systems.

 

滑石粉在塑料行业中的这些应用,必须得清楚!

 

7. Application in other resins

 

1. In fluoropolymers such as polytetrafluoroethylene, the addition of talc can improve creep strength, wear resistance, toughness, thermal conductivity, compressive strength, hardness, creep tendency and heat deformability at high temperatures.
2. Adding talcum powder filler in POM can further improve its toughness.
3. Adding superfine talcum powder to polycarbonate can improve toughness.
4. Adding ultrafine talcum powder to polyphenylene sulfide can obtain better processability, lower shrinkage, and precise demoulding size


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