Halogen-free flame-retardant compounding system coordinated with organic aluminum phosphite and application of same to glass fiber reinforced engineering plastics

Abstract

The invention discloses a halogen-free flame-retardant compounding system coordinated with organic aluminum phosphate. The compounding system comprises the following raw materials: in terms of a totalweight of 100%, 40-90% of aluminum diethylhypophosphite, 10-30% of organic aluminum phosphate, 1-20% of melamine metal phosphate and 1-15% of zinc stannate. The organic aluminum phosphate has a structural formula as shown in a formula (I) which is described in the specification. In the formula, R is selected from a group consisting of a straight-chain fatty acid saturated alkyl group with a carbon number of 1-6, a straight-chain fatty acid unsaturated alkyl group with a carbon number of 1-6 and an aryl group. The invention discloses the novel o halogen-free flame-retardant compounding systemcoordinated with organic aluminum phosphate. The halogen-free flame-retardant compounding system has the characteristics of high flame retardancy, no migration, no corrosion to equipment and the like,and can be applied to glass fiber reinforced engineering plastics to prepare halogen-free flame-retardant glass fiber reinforced engineering plastic materials used for the preparation of parts or products of electronic 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 synergized with organic aluminum phosphite and its application in 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 existence o...

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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