Development and application of the hottest environ

Environmental Friendly Flame Retardants: development and application in domestic plastic packaging (Part 1)

with the increasing awareness of global safety and environmental protection, people have higher and higher requirements for fire safety and flame retardant products. Halogen-free, low smoke, low toxicity environmental friendly flame retardants have become the goal of people. At present, nearly 80% of domestic flame retardants for plastic modification are halogen-containing flame retardants, represented by polybrominated diphenyl ethers and polybrominated biphenyls. Brominated flame retardants have high efficiency, low dosage, little impact on the performance of materials, and moderate price. Compared with other types of flame retardants, its efficiency/price ratio is more superior. 70% - 80% of China's electronic and electrical products for export use this kind of flame retardant. However, bromine antimony flame retardant system will generate a large amount of smoke and corrosive gases during thermal cracking and combustion, and in recent years, some European Union countries believe that bromine flame retardants will produce toxic and carcinogenic polybrominated benzoxaying (PBDD) and polybrominated dibenzofuran (pbdf) when burning, and there is no need to use adhesive tape. In February 2003, the European Union issued two prohibitions, RoHS and WEEE, RoHS is the prohibition of hazardous substances, and the restriction of hazrodous Substances Directive stipulates that all electronic and electrical equipment sold in EU countries shall not contain PBBs and PBDEs since January 1, 2006

commonly used environmental friendly flame retardants

I. environmental friendly bromine flame retardants

1. Decabromodiphenylethane 8010 8010 is not a polybrominated diphenyl ether, and it is absolutely impossible to produce PBDD or pbdf in combustion; The relative molecular weight of 8010 is 971; The bromine content is 82%, which is equivalent to that of DBDPO (83%), so the flame retardancy is basically the same; The initial melting point is 345 ℃, and the thermal stability is higher than that of DBDPO (305 ℃); Its light resistance and difficult dialysis characteristics are better than DBDPO. The most valuable thing is that its flame-retardant plastic can be recycled, which is a feature that many bromine flame retardants do not have. 8010 industrial products have an average particle size of 3 μ m. The free flowing, micro granulated white crystalline powder is easy to disperse in plastic modification, and the color of plastic products is free. Moreover, the industrialization cost is equivalent to that of DBDPO, and it is the most ideal substitute for DBDPO

as an additive bromine flame retardant, 8010 also needs to be used with antimonides in the process of use, and the proportion is the same as that of dbdpo/antimonides; Compared with DBDPO, 8010 is more suitable for engineering plastics with high temperature and high viscosity

first of all, the industrial production of IML molding system for 8010 thin-walled containers with fully biodegradable materials was carried out by Yabao company of the United States, and the production and use patents were applied for; This once delayed the domestic research and production units of flame retardants to carry out this research, but after inquiry, it was found that the dedicated ASIC chip of Ya shared a series of peripheral work such as sampling and condition monitoring. The patent scope of Bao company is outside China, so 8010 can be produced and used in China, but it cannot be exported and applied for a patent. The domestic research and production units have invested in research, and the industrial scale test was successful at the end of 2002. At present, the representatives of manufacturers in the domestic market include Yabao company, Dahu company, Suzhou Jinghua Industry Co., Ltd., Shandong Laiyu chemical industry, etc

2. Brominated epoxy resin

brominated epoxy resin for flame retardant, also known as tetrabromobisphenol A epoxy resin oligomer, has a bromine content of 50% and a molecular weight of 1000~45000, which is divided into EP type and EC type; Compared with EC type, EP type has better light resistance but lower bromine content, while ABS and hips, which are flame retardant, have better impact strength. Commercial brominated epoxy resin is a mixture of milky yellow semi transparent chips and white powder. Domestic brominated epoxy resin has pungent smell, while Israel deadsea brominated products have no smell. Brominated epoxy resin has satisfactory melt flow rate, high flame retardant efficiency, excellent thermal stability and light stability, and can endow flame retardant substrate with good mechanical properties, and the product does not frost

low phase molecular weight brominated epoxy resin is suitable for flame retardant ABS and hips, and high phase molecular weight is suitable for flame retardant abs/pc alloy and engineering plastics such as PC, pet, PBT, etc. It needs to be used together with antimonide in the process of use

deadsea bromine company of Israel is the most famous manufacturer of brominated epoxy flame retardant in the world, with perfect production process and excellent product quality; It was once the only brand in the domestic brominated epoxy flame retardant market. Since 2002, Shandong Laiyu Chemical Co., Ltd. has commercialized brominated epoxy resin successively, but the product quality is not satisfactory. At present, the representative products in the domestic market include: Israel deadsea bromine company f2100f2400, Shandong Laiyu chemical, Taiwan Changchun beb series, etc. (to be continued)