What additives will be light when PP plastic is filled

There are three methods to reduce the density (specific gravity) of plastics: foaming modification, adding lightweight fillers and blending lightweight resins.

1.Foaming modification:

Foaming of plastic products is the most effective way to reduce their density. However, the two modification methods of adding lightweight additives and blending lightweight resins can only reduce the density slightly, and the reduction is generally only about 50%, and the minimum relative density can only reach about that. The density of plastic foamed products varies in a wide range, and the relative density can reach as low as 10-3.

2.Add lightweight filler:

This method makes the density decrease relatively small, and generally the lowest can be reduced to about the relative density. The relative density of fillers is mostly larger than that of plastics, and there are only the following types of fillers with smaller relative density than plastics.

1) Microbeads.

a.Glass hollow microspheres (beads) have a relative density of and are mainly used for thermosetting resins;

b.Phenolic beads have a relative density of.

2) Organic fillers.

a.Cork flour relative density, apparent density;

b.Relative density of fiber powder and cotton chips;

c.Husk crops such as straw meal, peanut flour and coconut shell flour.

3.Blend of lightweight resins.

There is also a lightweight filler: wood flour, which is the fine fiber of wood, which is very light. However, there are certain limitations, and different methods can be adopted according to oneself.

Buy a hydrometer and look for a terno.

Dear, I'm glad to answer for you: What additives will be lighter when filling PP plasticsAnswer: Dear, there are three ways to reduce the density (specific gravity) of plastics: foaming modification, adding lightweight fillers and blending lightweight resins.

Adding oxidant to the raw material of PP plastic board can prevent the raw material from coming into contact with oxygen in the air and automatically dismantling and degrading the oxygen bridge. A small amount of oxidant is also beneficial to improve the quality of PP plastic sheets. At present, the domestic production of slabs always contains oxygen before leaving the factory, so no special needs of antioxidants are added.

Antistatic agents. Due to the excellent insulation performance of PP plastic board, the electrostatic hazard of extruded plastic board is very serious during use. Ultraviolet absorbers.

Plastic sheets are susceptible to light (ultraviolet light) aging and degradation, so polyolefin products are used in light environments for a long time. Molded parts should be added to raw materials prior to the addition of UV absorbers.

Some plastics themselves are simple resins, such as polyethylene, polystyrene, etc., which are called single-component plastics. In addition to synthetic resins, some plastics also contain other auxiliary materials, such as plasticizers, stabilizers, colorants, various fillers, etc., called multi-component plastics, plastic additives The purpose of adding additives to plastics is mainly to improve processing performance, improve efficiency and reduce costs. Additives account for a small proportion of plastic materials, but they have a great impact on the quality of plastic products.

Different types of plastics require different types and dosages of additives due to different molding processing methods and use conditions. The main additives are as follows:

Plasticizer plasticizer can increase the softness, elongation and plasticity of plastics, reduce the flow temperature and hardness of plastics, and is conducive to the molding of plastic products. Commonly used are phthalates, sebacates, chlorinated paraffins, etc.

Flame retardantsAdditives that can improve the flame resistance of plastics are called flame retardants. Most plastics containing flame retardants are self-extinguishing, or have a slowed combustion rate, etc. Commonly used flame retardants include antimony oxide, aluminum, boron compounds, halides and phosphate esters, tetrachlorobenzephthalic anhydride, tetraauphthalic anhydride, etc.

LubricantsLubricants are substances added to improve the release of plastics during heat molding and improve the surface finish of products. Commonly used lubricants are: stearic acid and its salts, paraffin, synthetic wax, etc.

Reinforcements and fillers.

In many plastics, reinforcing materials and fillers occupy a considerable proportion, especially reinforcing plastics and calcium plastic materials. The main purpose is: in order to improve the strength and rigidity of plastic products, various fiber materials or inorganic substances are generally added.

The most commonly used reinforcing materials are: glass fiber, asbestos, quartz, carbon black, silicate, calcium carbonate, metal oxides, etc.

Antistatic agents. Antistatic agents play a role in eliminating or reducing the generation of static electricity on the surface of plastic products. Antistatic agents are mostly electrolytes, which have limited compatibility with synthetic resins, so they can migrate to the surface of plastics to absorb moisture and eliminate static electricity.

Foaming agentPlastic foaming agent is a kind of low-molecular organic matter that can be vaporized at a certain temperature, such as dichlorodifluoromethane; or organic compounds that decompose gases when heated. These gases remain in the plastic matrix to form a foam with many fine foam structures. Commonly used are azo compounds, nitroso compounds, etc.

ColorantsColorants are used in the coloring of plastics. It mainly plays the role of beautification and modification. About 80% of plastic products are colored to make the final product.