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The use of talc in the plastics industry

2019-05-22 11:40:18

At 30%, the original strength can still be maintained, and the impact strength is slightly increased. For polyethylene blown film, filling superfine talc masterbatch is better than other fillers, easy to form, and good processability. Moreover, this kind of film can reduce the oxygen transmission rate by 80%, which is especially suitable for packaging oily foods, such as peanuts, broad beans, etc., without oil or deterioration for a long time: this kind of film can reduce the water vapor transmission rate by 70% , has good moisture resistance, very suitable for underground geotechnical moisture-proof cloth, but also suitable for packaging such as ham, sausage, cheese and other foods. Talc Masterbatch

3. Application in ABS resin: The superfine talc masterbatch made by special method has good dispersion 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, good creep resistance, and can withstand 7Mpa load without dimensional change Therefore, it is often used to injection mold the shells of various instruments, TV sets, tape recorders, mobile phones, etc. Of course, it is also widely used in other fields such as textile equipment, electrical parts, auto parts, and aircraft parts. However, people are not satisfied with the existing performance of ABS, and the research on ABS modification has been carried out extensively, and the relevant information published is not small. For example, the blister sheet of automobile instrument panel made by blending ABS and PVC, and the cover of imitation leather luggage made by blending ABS and PVC, not only have high strength and toughness, but also can maintain the durability of surface patterns. This blended material is filled with ultrafine calcium carbonate or ultrafine talc powder, which can significantly improve the notched impact strength and tear resistance of the blended material, for example: adding ultrafine calcium carbonate 5-15%, notched impact strength It can be increased by 2-4 times. Since ABS is an amorphous polymer, it has the function of accommodating more fillers. Adding superfine talc masterbatch can not only significantly improve the original performance of ABS, but also have better performance than adding calcium carbonate, but also reduce costs.


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. It is highly brittle and susceptible to environmental stress cracking. The addition of superfine talc masterbatch can improve the impact toughness, adjust the rheology, significantly improve the flexural modulus, and also improve the tensile yield strength. For example: adding 40% superfine talc masterbatch, the flexural modulus increases from 23800kg/cm2 to 58800kg/cm2, and the tensile strength increases from 336kg/cm2 to 385kg/cm2

5. Application in nylon resin: For nylon (polyamide), special attention is paid to the toughness and wear resistance of this plastic in the industry. Nylon is generally hard, horny-like, with good abrasion resistance and high dimensional stability. These properties can be further enhanced by fillers or reinforcing agents. The hardness, stiffness, wear resistance and heat distortion temperature of PP66 are higher in nylon; PP6 is known for its higher toughness; PP610 has lower water absorption and thus higher dimensional stability; PP11 has the highest impact strength in nylon . Among various fillers, talc with layered structure can improve the original good properties 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, and mechanical properties are significantly dependent on temperature. The molecule contains water-absorbing gene amine group, which has high water absorption rate, and the product is easy to absorb water during use. Expansion deformation, rapid cooling and incomplete crystallization during processing and molding, and still crystallization during use, which leads to product deformation and even cracking. The above shortcomings of nylon can be greatly improved by adding superfine talc masterbatch. Talc has the function of a nucleating agent, which can increase the crystallization rate of nylon and increase the degree of crystallinity after adding; therefore, it can especially improve the toughness of nylon. , mechanical strength, hardness, thermal stability, dimensional stability, improve product surface quality and deformation behavior, also have a good impact on moisture absorption, electrical properties and chemical properties. For example: Fill PP6 with 2500 mesh talc masterbatch, the properties are as follows: Mechanical properties Unfilled PP6 Filled with 35% talc masterbatch Tensile strength (Kg/Cm2) 690-790 900 Tensile elongation (%) 100 4.3 Disturbance Bending strength (Kg/Cm2) 1087 1470 Odd bending strength (Kg/Cm2) 2.6×104 60000 Thermal strength 0.48mpa(℃) 185-190 212 1.86mpa(℃) 68-85 183

6. Application in polyvinyl chloride resin: Filling polyvinyl chloride with ordinary powder has been widely used, such as the manufacture of rigid polyvinyl chloride pipes, the filling amount reaches 40%, but the tensile strength and impact of polyvinyl chloride The strength must be reduced. For example, according to the literature: adding powder to 100 parts of 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 The strength number is reduced from 252kg/cm2 to 204kg/cm2; when added to 35 parts by volume, the tensile strength is reduced to 150kg/cm2; however, if the added powder particles become smaller (such as 5 microns, 2500 mesh), add to At 40-45% volume fraction, it can be found that the yield strength of the material is even higher than the original fracture strength, and the average particle size of 5 microns (2500 mesh) flake talc, even at high content, is not suitable for polyvinyl chloride systems. Enhancement can also be shown. For impact strength, adding ultrafine talcum powder, the unnotched impact strength is basically not reduced within 15% by weight, the notched impact strength is reduced, and the flexural modulus can be significantly increased. However, ultrafine powder has a very significant reinforcing effect on PVC systems with toughening agents, such as PVC/CPE and PVC/ABS systems. For example, in the PVC/ABS (=100/8) system, when adding 5 parts of ultrafine calcium carbonate, the notched impact strength of the material increases from 10kg/cm2 to 25kg/cm2, and the tensile strength increases from 29kg/cm2 to 28kg/cm2. When 10 parts were added, the notched impact strength increased from 10kg/cm2 to 33kg/cm2, and the tensile strength remained at the level of 28kg/cm2.

Seven applications in other resins: 1. In fluoropolymers such as polytetrafluoroethylene, adding fillers or reinforcing agents can improve creep strength, wear resistance, toughness, thermal conductivity, compressive strength, hardness, creep Tendency to change and thermal deformation at high temperature. 2. Adding fillers to polyoxymethylene can further improve its own 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 demoulding size and improved surface gloss.

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