Halogen-free flame retarding compounded system based on phosphorus/aluminum compound, and application of same in glass fiber reinforced engineering plastic

Abstract

The invention discloses a halogen-free flame retarding compounded system based on a phosphorus/aluminum compound. The compounded system, on the basis of total weight of 100%, includes 40-90% of diethyl aluminum hypophosphite, 10-50% of organic aluminum phosphite, and 1-10% of a zinc salt thermal stable compound. The organic aluminum phosphite is represented as the structural formula (I), wherein Ris selected from C1-C6 straight-chain saturated aliphatic hydrocarbon groups, C1-C6 straight-chain unsaturated aliphatic hydrocarbon groups or aryl groups. The invention discloses a novel halogen-free flame retarding compounded system based on the phosphorus/aluminum compound; the system has high flame retarding performance, is free of migration and has no corrosion on equipment, can be applied to glass fiber reinforced engineering plastic to produce halogen-free flame-retarding glass fiber reinforced engineering plastic, which is used for manufacturing parts of products in the field of electronics and electric appliances.

Description

technical field [0001] The invention relates to the technical field of halogen-free flame retardants, in particular to a halogen-free flame-retardant composite system based on phosphorus-aluminum compounds and its application in flame-retardant glass fiber reinforced engineering plastics. Background technique [0002] Glass fiber reinforced engineering plastics (such as various nylons, polyesters, etc.) are widely used in electronic appliances due to their good rigidity and impact resistance, low warpage, high dimensional stability, and good surface appearance. field. Applications in these fields require flame retardant materials, and most engineering plastics are flammable materials. After compounding with glass fibers, glass fiber reinforced engineering plastics are easier to burn due to the wick effect of glass fibers. Therefore, when glass fiber reinforced engineering plastics are applied in these fields, it is necessary to solve the problem of flame retardancy, and the...

AI Technical Summary

Problems solved by technology

For red phosphorus, although its flame retardant effect is good, it faces two problems: one is the color of red phosphorus, which limits its application range, and is usually only used in black products; the other is that it is easy to generate phosphine during processing and other highly toxic substances, which bring environmental protection and safety problems, so red phosphorus is not the best choice for glass fiber reinforced engineering plastics

However, there are still some shortcomings in the phosphorus-nitrogen complex system based on diethylaluminum hypophosphite, which are mainly manifested in: first, the two components will react and decompose at high temperature, resulting in a small amount of acid gas. It will corrode the metal parts of the processing equipment, and the parts need to be replaced after a certain period of time, which will increase the cost and reduce the production efficiency; the second is that there is a certain precipitation of the nitrogen-containing compound MPP. After the molded product, there will be deposits on the mold. The existence of these deposits will affect the appearance of the product. This requires shutdown to clean the mold, which will also reduce production efficiency. At the same time, this precipitation will also cause the flame retardant to the product. Surface migration leads to uneven distribution and loss of flame retardants, which eventually makes the flame retardant of the material ineffective, posing safety hazards

[0005] Generally speaking, the flame retardant systems currently used in glass fiber reinforced engineering plastics have problems such as color, generation of toxic gases, easy precipitation, and corrosion. Lower etc.

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