As an additive, modifier or filler, talc powder is widely used in a number of chemical industries, in the modification of plastics and rubber applications has a significant strengthening effect, can improve the tensile strength of plastic products, impact properties, creep resistance, heat resistance, tear resistance and so on. It can also improve the appearance of products, reduce the shrinkage rate of products to improve the barrier effect, reduce permeability, increase the rigidity and stiffness of plastic products, has become an important modified material to improve the physical properties of plastic products, more and more favored by the plastic industry.

talc powder raw material is talc, talc has high gloss, small oil absorption value, good transparency and other advantages, good chemical stability and excellent physical properties of the majority of modified manufacturers favor, density of 2.7 ~ 2.8g/cm3, similar to heavy calcium, Mohs hardness is 1, the lowest hardness in inorganic powder, In the preparation of talc powder due to its relatively soft, only need to carry out simple mechanical friction can be, but if you want to achieve a better surface activation modification effect, still need to take a special process.

Then how to measure the quality of talc powder?

(1) Purity The higher the purity of talc, the better the effect of its enhancement. Other mineral impurities in talc, metal minerals (especially iron) have a very obvious effect on the anti-aging property of plastics.

(2) Wet whiteness and hue after mixing talc and plastic, the color of plastic changes more or less. Dark plastic products do not have too high a requirement for the whiteness of the talc added. However, in order to make light-colored products have a better color, talc should have a higher wet whiteness and a suitable hue.

(3)SiO2 content The content of silicon (SiO2) in talc is an important indicator to measure the grade of talc. To choose talc powder according to the performance requirements of different plastic products, such as the talc silicon content added in the film should be higher, the particle size is small, the particle size distribution is narrow, in order to make the film's high light transmittance, tensile strength, puncture resistance and other indicators have been significantly improved. And in injection molding, plate, bar silicon content requirements need not be too high, talc with lower silicon content is lower in price, while rich in resources.

(4) fluidity In the extrusion process, talc than other granular inorganic materials poor fluidity, dispersion is difficult, screw torque is large, so the use of better activation additives is the key to overcome the above problems.

(5) electrostatic talc has a layered structure, large specific surface area, the irregularity of particle shape and the convex and concave shape of the surface make it a large friction coefficient, easy to produce static electricity, resulting in condensation between small particles, difficult to disperse, affecting the application effect.

Plastic application field

Talc can be widely used in PP, PE, PS, PA, ABS, PC, PVC and other resins. While reducing the production cost of plastic products, talc powder also has the advantages of significantly improving the rigidity, heat resistance, creep resistance and reducing shrinkage of plastic products.

(1) Film products talc can also improve the mechanical properties of the film, such as: tensile strength, bending strength and rigidity have been improved. It can also make the appearance of the film more colorful, pearl-like, and the hand sensibility is also improved.

(2) fine talc powder of wire drawing products can significantly improve the physical properties of woven bags, and the service life and long-term safety of products are significantly improved. In the production of round silk products to add an appropriate amount of talc to enhance the modified masterbatch, can achieve satisfactory results. Such as adding 5% to 10% of the product in the fishing net silk, can effectively reduce the entanglement of the fishing net silk, without affecting the transparent effect of the fishing net, improve the visual effect of the fishing net in the fishing operation in the water, improve the fishing efficiency.

(3) Hollow products hollow products in the plastic bucket category is a new type of packaging container, with chemical resistance stability, small corrosion, light weight, clean health, low production costs, can replace the metal production of barrels, Widely used in chemical, daily use, grease, food, medical supplies of liquid packaging

(4) Injection molding products Injection molding products are many types, mainly industrial parts, toy products, daily necessities and so on. After the application of talc powder in the injection molding products can significantly improve the mechanical properties of the injection molding products, reduce the dent caused by the contraction of the gate and edge of the injection molding parts, improve the transparency of the product, the appearance effect and the hand sensibility. Talc also has excellent dielectric property and barrier property, reduce the magnetoelectric radiation effect.

(5) Auto parts and aviation, military parts talc powder in the automotive plastic parts of the earliest application, the largest amount, in the aircraft, aviation, aerospace, military industry, talc chemical resistance, high and low temperature stability and excellent mechanical properties have been recognized, Widely used in military ammunition packing boxes, medical boxes, mechanical decorative parts and other products

(6) Home appliance parts China's home appliance industry has developed rapidly in recent years, according to relevant data, home appliance products 60%-80% made of plastic parts. Talc powder can not only reduce the production cost of home appliance parts, but also improve the quality and appearance of home appliance products

(7) pipe, plate products talc powder can improve the explosive pressure resistance of pipe, especially the ring stiffness is an important index restricting large plastic pipe, after adding a certain amount of talc powder, can significantly improve the ring stiffness of plastic pipe, Improve the dimensional stability of products, can improve the stiffness of the plate, flame retardancy and chemical stability.

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