Unsaturated polyester is unsaturated dicarboxylic acid (or acid anhydride) or their mixed acid composed of saturated dicarboxylic acid (or acid anhydride) and polyhydric alcohol. It is linear with ester bond and unsaturated double bond. polymer compounds. Usually, the polyesterification polycondensation reaction is carried out at 190-220°C until the desired acid value (or viscosity) is reached. After the polyester condensation reaction is completed, a certain amount of vinyl monomer is added while hot to form a viscous liquid. Such a polymer solution is called an unsaturated polyester resin.

Halogen-free flame retardants, as the name suggests, do not contain halogens and have relatively good flame retardant effects. The main components are phosphorus-based compounds and metal hydroxides. It has the advantages of non-volatile and no corrosive gas during combustion, and is called a pollution-free flame retardant. In addition, there are several new types of halogen-free flame retardants such as silicon series and nitrogen series. Halogen-free flame retardants have become new products that conform to the development trend of international standards for flame retardants because of their clean, environmentally friendly and pollution-free advantages.

PVC cable material is based on polyvinyl chloride resin, adding stabilizers, lubricants and inorganic fillers, etc., and is prepared by mixing, kneading and extruding particles. Although its medium performance is general and not environmentally friendly enough, its price is low and the process is simple; PVC cable material is still one of the most widely used cable materials. When using PVC cable material, there may be pores, rough surface, brittleness, etc.

As we all know, the UL flame retardant grade increases step by step from HB, V-2, V-1, V-0, 5VB to 5VA. The UL flame retardant standard is a popular standard for daily inspection of whether materials are flame retardant. However, because it is an American standard, usually after translation, Chinese people have a variety of understandings of the standard. Each factory has its own set of "V0" grades. It brings great inconvenience to upstream and downstream manufacturers.

The burning and flame retardant burning of rubber is a natural phenomenon in the objective world, such as lightning strikes can cause forest fires. Combustion is also an artificial phenomenon required in human life or production. For combustion to occur and proceed, three conditions are required, none of which are indispensable. Any substance at a certain temperature can ignite only after the ambient temperature reaches the ignition point.

Yellow phosphorus has good economic extension value and plays an important role in my country's economic development. After more than 50 years of development, the production capacity, output and consumption of yellow phosphorus industry ranks first in the world. However, due to the technical bottleneck of the industry, yellow phosphorus is still a resource-based and high-energy-consumption product, and the product was listed in the "high-energy-consumption, high-pollution" product list by the former Ministry of Environmental Protection. In particular, there is no evaluation index system for green factories in the yellow phosphorus industry at home and abroad.

PVC liquid flame retardant is a kind of composite high-efficiency flame retardant. It is colorless and transparent liquid in appearance. It is suitable for the flame retardant of PVC transparent products. It has good flame retardant and plasticizing properties. Improve the water resistance, cold resistance, antistatic properties of products, no exudation, no color pollution. Widely used in soft pvc/pu cable and rigid polyurethane foam, unsaturated polyester resin, polyvinyl chloride, polyvinyl acetate.

Combustion is an indispensable natural phenomenon in the objective world and plays an important role in daily production and life. The generation of combustion needs to meet three conditions, that is, a certain temperature, oxygen and flammable substances, all of which are indispensable. Among them, flammable substances are the bodies that can be burned, which are generally hydrocarbons, such as various biological materials such as flowers, plants and trees, or high-molecular polymers, including plastics, rubber, and fibers. Here, let's learn about rubber combustion and rubber flame retardants.