Powder is involved in many industries and fields. It can be said that powder technology is one of the basic technologies supporting high technology. The so-called powder technology includes two aspects, one is the design and manufacturing technology of powder particles, and the other is the powder processing technology, that is, how to add powder to other substances to exert its unique role. The superfine talcum powder masterbatch is added to the plastic to significantly increase the rigidity and creep resistance, hardness and surface scratch resistance, heat resistance and heat distortion temperature of the plastic product. The talcum powder of a fineness can also be improved. Improve the impact strength of plastic products. And after adding, it also has a lubricating effect, which can promote the flow and improve the processing technology of the plastic.
First, the application in polypropylene resin:
Talc is often used to fill polypropylene. Talc has a sheet-like structural feature of a flake configuration. Therefore, 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 masterbatch can not only significantly improve the rigidity, surface hardness, heat creep resistance, electrical insulation, dimensional stability of polypropylene products, but also improve polypropylene. Impact 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. Polypropylene composites filled with 20% and 40% ultrafine talc powder can significantly improve the rigidity of polypropylene and the creep resistance at high temperatures, both at room temperature and high temperature. In the automotive industry, polypropylene-added talc masterbatch composites are used in fan covers, heater covers, ducts, battery heat shields, fluid pump parts, etc.; in the aircraft industry, for refrigerator door gaskets, heating And vacuum pump cover, washing machine agitator; 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 four particle types: fibrous, layered, acicular and standard (frozen). However, only the layer is applied industrially. The layered sandwich structure of talc, each layer has a certain degree of 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. For example, filling the injection-grade high-density polyethylene composite with superfine talc powder (1250 mesh, 2500 mesh) masterbatch, in addition to the above-mentioned performance is significantly improved, the tensile strength of the composite material increases, increased to 10% when added The maximum value, the original strength can be maintained when 30% is added, and the impact strength is slightly increased. For polyethylene blown film, the superfine talc powder masterbatch is better than other fillers, easy to form and good in processability. Moreover, the film can reduce the oxygen transmission rate by 80%, and is particularly suitable for packaging oily foods, such as peanuts, broad beans, etc., and maintains no oil for a long time, and does not deteriorate: the film can reduce the water vapor transmission rate by 70%. It has good moisture resistance and is suitable for underground geotextile moisture-proof cloth. It is also suitable for packaged food.
Third, the application in aBS resin:
The superfine talcum powder masterbatch manufactured by special method has good dispersibility and uniformity when added to plastic.
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 creep resistance, and can withstand 7Mpa load without changing size. Therefore, it is used to injection molding various housings of various instruments, televisions, tape recorders, mobile phones, etc., of course, in other fields such as textile equipment, electrical parts, automobile parts, aircraft parts and the like. However, people do not meet the existing performance of aBS, and extensive research on aBS modification has not been published. 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, for example: adding ultrafine calcium carbonate 5-15%, notched impact The strength can be increased by 2-4 times. Since aBS is an amorphous polymer, it has a function of accommodating more filler. The addition of ultrafine talc masterbatch can significantly improve the original performance of aBS and reduce costs.
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 talcum powder masterbatch can improve the impact toughness, adjust the rheology, significantly increase the modulus of deformation, and improve the tensile yield strength. For example, adding 40% ultrafine talc masterbatch, the disturbing modulus is increased by 58800kg/cm2 from 23800kg/cm2, and the tensile strength is increased from 336kg/cm2 to 385kg/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, the addition of ultrafine talcum powder masterbatch can greatly improve, talc powder has the function of nucleating agent, can increase the crystallization rate of nylon and increase the crystallinity after adding; therefore, it can especially improve the toughness of nylon. , mechanical strength, hardness, thermal stability, dimensional stability, improve the surface quality and deformation behavior of the product, also have a good influence on moisture absorption, electrical properties and chemical properties. For example: Filling PP6 with 2500 mesh talc masterbatch, the performance is as follows: mechanical properties unfilled PP6 filled 35% talcum powder masterbatch tensile strength (Kg/Cm2) 690-790900 tensile elongation (%) 1004.3 disturbing strength (Kg/Cm2) 10871470 odd bending strength (Kg/Cm2) 2.6×10460000 hot deformation strength 0.48mpa (°C) 185-1902121.86mpa (°C) 68-85183
6. Application in polyvinyl chloride resin:
Filling polyvinyl chloride with ordinary powder has been very common, such as the manufacture of hard polyvinyl chloride pipe, the filling amount is up to 40%, but the tensile strength and impact strength of polyvinyl chloride are reduced, as described in the literature: at 100 Adding powder to the polyvinyl chloride, when added to 7.3 parts by volume, the tensile strength is reduced from 252kg/cm2 to 215kg/cm2;
When added to 13.5 parts by volume, the tensile strength decreased from 252 kg/cm 2 by 204 kg/cm 2 ; when added to 35 parts by volume, the tensile strength decreased to 150 kg/cm 2 ; however, if the added powder particles were made smaller (eg 5 micron, 2500 mesh), when added to 40-45% by volume, it can be found that the yield strength of the material is even higher than the original breaking strength, and the average particle size is 5 micrometers (2500 mesh) of flaky talcum powder, even in At high levels, it also shows an enhanced effect on the PVC system. 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. However, 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. For example, PVC/aBS (=100/8) system, adding ultra-fine calcium carbonate, when adding 5 parts, the notched impact strength of the material is increased from 10kg/cm2 to 25kg/cm2, and the tensile strength is from 29kg/cm2 to 28kg/cm2. When 10 parts were added, the notched impact strength was increased from 10 kg/cm 2 to 33 kg/cm 2 , and the tensile strength was maintained at the level of 28 kg/cm 2 .
7. Application in other resins:
1. In fluoropolymers such as polytetrafluoroethylene, the addition of fillers or reinforcing agents can improve creep strength, wear resistance, toughness, thermal conductivity, compressive strength, hardness, creep tendency and heat at high temperatures. Deformability.
2. Adding a filler to polyoxymethylene can further improve its toughness.
3. Adding superfine talc masterbatch to polycarbonate can improve toughness.
4. Adding superfine talc masterbatch to polyphenylene sulfide can obtain better processability, lower shrinkage, accurate demolding size and improved surface gloss.
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