There are two main plastic colorants, one is inorganic […]
There are two main plastic colorants, one is inorganic pigments with strong hiding power and good heat resistance; the other is organic pigments with bright colors and strong tinting power. In addition, there are special colorants, such as fluorescent brighteners that can increase the whiteness of products in injection molding plants, and pearlescent materials that make plastic products pearly. Lubricant is a kind of substance that can reduce the friction inside the plastic melt and between the melt and the processing equipment, and improve the fluidity and demoldability of the plastic during the molding process.
The fillers commonly used in industry include inorganic fillers such as calcium carbonate and talc and organic fillers such as wood powder. Reinforcing materials can significantly improve the mechanical properties, heat resistance and dimensional stability of plastic products. Most of the varieties are fibrous substances, such as glass fiber, asbestos fiber, carbon fiber, etc. Coloring agent is a kind of substance that can color and give plastic color. After coloring, plastic products are not only beautiful and easy to identify, but also increase the commodity value of plastics.
Functional plastic additives, such as colorants, flame retardants, fillers, antistatic agents, etc., can impart various good properties to polymers. Therefore, plastic additives play an important role in the development of the plastics industry. There are many types of plastic additives, and with the development of the plastic industry, new types of additives continue to emerge. There are now more than a dozen categories and hundreds of varieties. The two types of additives, heat stabilizer and plasticizer, are mainly used for polyvinyl chloride and its copolymers.
Because of the unstable molecular chain structure of resins such as heat stabilizers and plasticizers, they are sensitive to heat and are easily degraded during molding and use. Heat stabilizers are produced to solve this problem. There are basic lead salts in varieties. Class, metal soap class, organic tin class. The plasticizer is distributed between the macromolecular chains, reducing the intermolecular force, reducing the viscosity of the polymer and increasing the flexibility.