The important function and application mode of carbon black in plastic products

Carbon black is a black powder substance, which is widely used in plastic products because of its good pigment properties and enhancement properties. In plastic products, the main role of carbon black is to enhance the strength, hardness, wear resistance and weather resistance of plastic, but also can improve the processing performance and surface gloss of plastic. The important role and application of carbon black in plastic products will be introduced in detail below.

I. The role of carbon black in plastic product

Enhance the strength and hardness of plastic

Carbon black can increase the strength and hardness of plastic, so that plastic products have better durability and compression performance. Carbon black can increase the tensile strength, bending strength and impact strength of plastics, thereby improving the mechanical properties of plastic products.

Improve the wear resistance and weather resistance of plastics

Carbon black can improve the wear resistance and weather resistance of plastics, so that plastic products have better durability and anti-aging properties. Carbon black can prevent the erosion of ultraviolet rays and prolong the service life of plastic products.

Improve the processing performance of plastics

Carbon black can improve the processing performance of plastics and make plastic products easier to process. Carbon black can reduce the melting point and viscosity of plastics, improve the fluidity of plastics, and thus make plastics easier to process and form.

Improve the surface gloss of plastic

Carbon black can improve the surface gloss of plastic and make plastic products more beautiful. Carbon black can increase the antistatic properties of plastic, prevent the generation of static electricity, so that plastic products have more gloss.

Ⅱ.Application of carbon black in plastic products

The amount of carbon black added

The amount of carbon black added is generally 1% to 10% of the weight of the plastic, and the specific amount should be determined according to the type and requirements of the plastic. If the amount is too large, it will affect the transparency and color of the plastic, but also reduce the toughness and ductility of the plastic.

Dispersion mode of carbon black

The dispersion mode of carbon black has great influence on the properties of plastic products. Carbon black can be dispersed by mechanical mixing, hot melt mixing, wet mixing and other ways. Among them, mechanical mixing is the most commonly used dispersion method, which can evenly disperse carbon black in plastics by high-speed stirring and grinding.

Selection of carbon black

The choice of carbon black should be determined according to the type and requirements of plastics. In general, carbon black can be divided into three types: reactive carbon black, semi-reactive carbon black and inactive carbon black.

Reactive carbon black has high specific surface area and adsorption property, which can enhance the strength and hardness of plastics. Semi-reactive carbon black has medium surface area and adsorption property, which can improve the wear resistance and weather resistance of plastics. Inactive carbon black has low specific surface area and adsorption property, which can improve the processing performance and surface gloss of plastics.

Therefore, when using carbon black, we need to determine the amount of carbon black addition, dispersion and selection according to the types and requirements of plastics to achieve the best effect.