How to classify environmentally friendly brominated flame retardants
Although halogen-free flame retardants such as phosphorus-nitrogen flame retardants and inorganic flame retardants are the hot spots in the research of plastic flame retardants, brominated flame retardants cannot be completely replaced because of their high flame retardant efficiency and wide application range. In order to reduce the pollution of the environment, the toxicity of the human body and the destruction of the ecology, many environmentally friendly brominated flame retardants have been developed, mainly polymeric brominated flame retardants and reactive brominated flame retardants. 1. Brominated epoxy resin: Brominated epoxy resin has excellent self-extinguishing and thermal stability, as well as good light stability, flame retardancy and high melt flow rate.
Although halogen-free flame retardants such as phosphorus-nitrogen flame retardants and inorganic flame retardants are the hot spots in the research of plastic flame retardants, bromine-based flame retardantsflame retardantWith its high flame retardant efficiency and wide application range, it can not be completely replaced. In order to reduce the pollution of the environment, the toxicity of the human body and the destruction of the ecology, many environmentally friendly brominated flame retardants have been developed, mainly polymeric brominated flame retardants and reactive brominated flame retardants.
1. Brominated epoxy resin: Brominated epoxy resin has excellent self-extinguishing and thermal stability, as well as good light stability, flame retardancy and high melt flow rate. It was originally developed and promoted by Tokyo Chi Company in Japan and is mainly used for electronic potting materials. With the emergence of "dioxin" problem, the environmental problems of traditional brominated flame retardants gradually attract people's attention. Brominated epoxy resin has been popularized and applied as an upgraded product, at present, it has become an important substitute for decaBDE, mainly used in PBT, polyolefin, PC/ABS alloy and other polymer materials flame retardant. When brominated epoxy resin is mixed with antimony trioxide, the content of the two is about 12%, which can make nylon 6, polyester and other materials reach UL94 V-0 grade.
2. Brominated polystyrene: Brominated polystyrene is an additive polymer brominated flame retardant. Its appearance is white or light yellow powder, insoluble in water, bromine content is more than 65%, thermal decomposition temperature is more than 310 ℃, and its molecular structure is a long-chain macromolecule. It has the advantages of high thermal stability and good compatibility with polymers. More importantly, it does not produce carcinogens such as dioxin during combustion. It is an environmentally friendly brominated flame retardant with excellent performance.
3. Pentabromobenzyl polyacrylate: Pentabromobenzyl polyacrylate is another excellent variety of polymerized bromine flame retardant, with high bromine content (about 70%). Products with different relative molecular masses can be synthesized according to the requirements of flame retardant materials. It has high flame retardancy, excellent thermochemical stability and electrical properties, no frost, no migration and excellent processing performance, it can reduce and inhibit the dripping phenomenon during resin combustion, and will not release carcinogens such as dioxins, which meets the requirements of environmental protection.
4. Brominated SBS: Brominated styrene-butadiene-styrene copolymer (SBS) is a new type of macromolecular brominated flame retardant developed and promoted by Dow Company in 2012. The US Safety and Protection Agency (EPA) has determined to replace hexabromocyclododecane with brominated SBS, and has now realized industrial production. The molecular weight of brominated SBS is about 100000, which has the advantages of no frost, no migration, no bioaccumulation, etc., because the structure is similar to polystyrene, it can be widely used in the flame retardant of polystyrene and other polymer materials.
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Everyone knows that there are two common flame retardants. Today we are going to talk about only one of them. Aluminum hydroxide flame retardant is an environmentally friendly halogen-free flame retardant, which can be widely used in fabrics, wood, plastics, and rubber., Polyurethane and other industries have ideal flame retardant effect. In the process of industrial application, it is found that flame retardant failure occurs when aluminum hydroxide flame retardant is added. The following are the reasons for the failure of aluminum hydroxide flame retardant, how to prevent it, how to deal with the operation, and restore the original function.
As a flame retardant, magnesium hydroxide also need to improve what aspects?
When it comes to flame retardants, everyone is familiar with them. Although we usually have less contact with them, we can know what they are used for from the name. Have to talk about magnesium hydroxide, we all know that its main presentation state is a granular, at present, the market sales of magnesium hydroxide particle size is larger, part of the commodity particle size up to tens of microns, immediately used as a flame retardant, poor dispersion, the physical properties of raw materials greater harm. In industrial production, physical grinding methods are generally used to reduce the particle size to 1 micron. The surface of magnesium hydroxide has high polarity and is easy to agglomerate. As the compatibility of refractory materials and polymer substrates, it not only reduces its flame retardant grade, but also causes more serious harm to the physical properties of raw materials.
Hefei Zhongke Flame Retardant New Material Co., Ltd
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