Talc powder is one of the most additives, modifiers or fillers. It is widely used in many chemical industries. It has obvious reinforcing effect in plastic and rubber modification applications, which can improve the tensile strength, impact performance and creep resistance of plastic products. Denaturation, heat resistance, tear resistance, and the like. It can also improve the appearance of the product, reduce the shrinkage rate of the product, improve the barrier effect, reduce the gas permeability, increase the rigidity and stiffness of the plastic product, and has become an important modifying material for improving the physical properties of plastic products, and is increasingly favored by the plastics industry. .
The raw material of talcum powder is talc. The talc has the advantages of high gloss, small oil absorption and good transparency. Good chemical stability and excellent physical properties are favored by the majority of modified manufacturers, with a density of 2.7-2.8g/cm3. Similar to heavy calcium, Mohs hardness is 1, and the hardness is the lowest in inorganic powder. Because of its softness in the preparation of talc, only simple mechanical friction is needed, but if better surface activation is to be achieved Sexual effects require special techniques.
So how do you measure the quality of talcum powder?
(1) The higher the purity of the purity talc, the better the enhancement effect. Other mineral impurities and metal minerals (especially iron) in talc have a significant effect on the aging resistance of plastics.
(2) The wet whiteness and the color of the talc and the plastic are mixed to change the color of the plastic more or less. Dark plastic products do not have too high a requirement for added talc whiteness. However, in order to make the light color product have a better color, the talc should have a higher wet whiteness and a suitable hue.
(3) The SiO2 content of silicon (SiO2) in talc is an important indicator for measuring the grade of talc. The talcum powder should be selected according to the performance requirements of different plastic products. For example, the talc powder added to the film should have a higher silicon content, a smaller particle size and a narrow particle size distribution, so that the film has high light transmittance, tensile strength and puncture resistance. Significant improvement in indicators such as sex. In the injection molding, sheet and bar, the silicon content is not necessarily too high, and the talc powder with lower silicon content is lower in price and rich in resources.
(4) Fluidity In the extrusion process, talc is less fluid than other granular inorganic materials, it is difficult to disperse, and the screw torque is large. Therefore, the use of better activation aids is the key to overcome the above problems.
(5) The electrostatic talc has a layered structure, large specific surface area, irregular shape of the particle shape and convex and concave shape of the surface, which makes the friction coefficient large, and easily generates static electricity, causing aggregation between the fine particles, which is difficult to disperse and affects the application effect. .
Plastic application field
Talc powder can be widely used in PP, PE, PS, PA, ABS, PC, PVC and other resins. While reducing the production cost of plastic products, talc has the advantages of significantly improving the rigidity, heat resistance, creep resistance and shrinkage of plastic products.
(1) Film products Talc powder can also improve the mechanical properties of the film, such as tensile strength, bending strength and rigidity. It also makes the appearance of the film more colorful, pearly, and improved in hand.
(2) Wire drawing products Fine talc powder can obviously improve the physical properties of the woven bag, and the service life and long-term safety of the product are obviously improved. Satisfactory results can be obtained by adding an appropriate amount of talc to enhance the modified masterbatch in the production of round filament products. For example, adding 5% to 10% of the product in the fishnet wire can effectively reduce the entanglement resistance of the fishing net wire, improve the visual effect of the fishing net in the fishing operation and improve the fishing efficiency without affecting the transparent effect of the fishing net.
(3) The plastic barrels in the hollow products of hollow products are new packaging containers, which have the advantages of chemical stability, low corrosivity, light weight, clean and hygienic, low production cost, etc., which can replace the barrels produced by metal materials. Widely used in liquid packaging for chemical, daily use, grease, food products, medical supplies
(4) Injection products  There are many types of injection molding products, mainly industrial parts, toys, and daily necessities. After application of talc powder in injection molded products, the mechanical properties of the injection molded product can be significantly improved, the depression caused by shrinkage of the gates and edges of the injection molded parts can be reduced, and the transparency, appearance effect and hand feeling of the product can be improved. Talc also has excellent dielectric properties and barrier properties, reducing the effects of magnetoelectric radiation.
(5) Automotive parts and aviation, military parts talcum powder is the earliest application in automotive plastic parts, the largest amount, in the aircraft, aviation, aerospace, military and other industries, the chemical resistance, high and low temperature stability of talcum powder Excellent mechanical properties have been recognized, widely used in military ammunition packaging, medical boxes, mechanical decorative parts and other products
(6) Home appliance parts In recent years, China's home appliance industry has developed rapidly. According to relevant information, 60%-80% of home appliances are made of plastic parts. Talc not only reduces the production cost of home appliance parts, but also improves the quality and appearance of home appliances.
(7) The talcum powder of pipe and plate products can improve the bursting pressure of the pipe. In particular, the ring stiffness is an important index restricting large plastic pipes. After adding a certain amount of talcum powder, the ring stiffness of the plastic pipe can be obviously improved and the product can be improved. Dimensional stability improves the stiffness, flame retardancy and chemical stability of the board.
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