Talking about the application of talcum powder in plastic industry

First, the application in polypropylene resin

Talc powder is often used to fill polypropylene, and talc has a sheet-like structural feature of a sheet configuration, so that a finer talc powder can be used as a reinforcing filler for polypropylene. In the modified system of polypropylene, the addition of ultrafine talcum powder can not only significantly improve the rigidity, surface hardness, heat creep resistance, electrical insulation, dimensional stability of polypropylene products, but also increase the impact of polypropylene. strength. Adding a small amount of talc powder to polypropylene can also act as a nucleating agent, improve the crystallinity of polypropylene, thereby improving the mechanical properties of polypropylene, and improving crystallinity and refining crystal grains. The transparency of polypropylene. In the automotive industry, polypropylene-added talc is mainly used in bumpers and dashboards for automobiles, as well as in fan covers, heater covers, ducts, fluid pump parts, etc.; in the aircraft industry, for refrigerator door gaskets. , heaters and vacuum pump covers, washer agitators; in the electrical industry, for injection molding various instrument housings and electrical components.

Second, the application in polyethylene resin

Talc is a natural magnesium silicate with a certain water resistance and a high degree of chemical inertness, so it has good chemical resistance and slidability. It can be used as an engineering plastic with polyethylene. It has good chemical resistance and fluidity and can compete with ABS, nylon and polycarbonate. Filling polyethylene with it can improve the following properties: increase toughness, flexural modulus and twist modulus; increase flexural strength; reduce creep tendency at normal temperature and high temperature; increase thermal transition temperature and dimensional stability; improve deformation And warpage, but also has a low coefficient of thermal expansion; improve thermal conductivity; improve the surface hardness and smoothness of molded parts; improve the mechanical strength of polyethylene. Adding different proportions of talc powder will have different effects on the physical properties of polyethylene materials, and the addition ratio is optimal at 10-15%. For polyethylene blown film, the superfine talc powder masterbatch is better than other fillers, easy to form and good in processability.

Third, the 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, research on ABS modification has been widely carried out. For example, ABS and PVC blended automobile instrument panel blister sheet, ABS and PVC blended leather bag hood mask, not only high strength, high toughness and can maintain the durability of the surface pattern. The blending material is filled with ultra-fine calcium carbonate or ultrafine talc powder, which can significantly improve the notched impact strength and tear strength of the blended material. Since ABS is an amorphous polymer, it has the function of accommodating more filler. . The addition of ultrafine talc powder can significantly improve the original performance of ABS and reduce costs. Therefore, it is used to injection molding various casings of various instruments, televisions, mobile phones, and the like.

Fourth, the application in polystyrene resin

Unmodified general-purpose polystyrene is an amorphous polymer which 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 ultrafine talc powder can improve the impact toughness, adjust the rheology, significantly increase the modulus of the distortion, and improve the tensile yield strength. For example, adding 40% ultrafine talcum powder or talcum powder masterbatch, the disturbing modulus is increased by 58800kg/cm2 from 23800kg/cm2, and the tensile strength is increased by 385kg/cm2 from 336kg/cm2.

Fifth, the application in nylon resin

For nylon (polyamide), industrial attention is paid to the toughness and wear resistance of this plastic. Nylon is generally hard, similar to keratin, with good abrasion resistance and high dimensional stability. These properties can be further improved by fillers or reinforcing agents. The hardness, stiffness, wear resistance and heat distortion temperature of PP66 are the highest in nylon; PP6 is known for its high toughness; PP610 has low water absorption and high dimensional stability; PP11 impact strength is in nylon. The highest. Among the various fillers, the layered structure of talc powder can improve the original good performance of nylon, and the improvement of wear resistance is the most important. Compared with metal, the unfilled modified nylon has low elastic modulus, low tensile and creep strength, and a significant dependence on mechanical properties and temperature. The molecule contains a water-absorbing amino group, which has high water absorption and is easy to absorb when used. Expansion deformation, rapid cooling and incomplete crystallization during processing, and crystallization during use, which causes deformation or even cracking of the product. The above disadvantages of nylon can be greatly improved by adding ultrafine talc powder. The talc powder has the function of nucleating agent. After adding, it can increase the crystallization rate of nylon and increase the crystallinity, so it can especially improve the toughness and hardness of nylon. , thermal stability, dimensional stability, improved product surface quality and deformation behavior, also have a good impact on moisture absorption, electrical properties and chemical properties.

Sixth, the application in polyvinyl chloride resin

Filling polyvinyl chloride with ordinary powder has been very common, such as the manufacture of hard PVC pipes, the amount of calcium carbonate can be up to 40%, but the tensile strength and impact strength of PVC are reduced; When the talc powder of 5 micrometers or 2000 mesh is added to 40-45% by volume, the yield strength of the material can be found to be even higher than the original breaking strength, and the polyvinyl chloride system is obviously enhanced. For the impact strength, the addition of the ultrafine talc powder, the unnotched impact strength is substantially not reduced within 15% by weight, the notched impact strength is lowered, and the disturbing modulus can be significantly increased. The ultrafine powder has a very significant reinforcing effect on the polyvinyl chloride system to which the toughening agent is added, such as PVC/CPE and PVC/ABS systems.

7. Application in other resins

1. Adding talc filler to polyoxymethylene can further improve its toughness.

2. In fluoropolymers such as polytetrafluoroethylene, the addition of talc can improve creep strength, wear resistance, thermal conductivity, hardness, creep tendency and thermal deformability at high temperatures.

3. Add ultra-fine talc powder to polycarbonate to improve toughness.

4. Adding ultrafine talc powder to polyphenylene sulfide can obtain better processability, lower shrinkage and accurate demolding size.