Phosphorus-nitrogen halogen-free flame retardant composition capable of improving thermal stability by utilizing inorganic metal phosphite and application of phosphorus-nitrogen halogen-free flame retardant composition

Abstract

The invention discloses a phosphorus-nitrogen halogen-free flame retardant composition capable of improving thermal stability by utilizing inorganic phosphite. The phosphorus-nitrogen halogen-free flame retardant composition is composed of the following raw materials by weight: 40 to 90 wt% of aluminum diethylphosphinate, 20 to 50 wt% of melamine polyphosphate, 0.1 to 10 wt% of a zinc-containing compound and 0.1 to 8 wt% of the inorganic phosphite. The flame retardant system provided by the invention has the characteristics of high flame retardancy, high thermal stability, no migration, no corrosion to equipment, etc. The flame retardant provided by the invention can be applied to glass fiber reinforced thermoplastic engineering plastics; and the halogen-free flame-retardant glass fiber reinforced thermoplastic engineering plastics containing the flame retardant provided by the invention can be used for preparation of parts or products in the fields of electronics and electrical appliances.

Description

technical field [0001] The present invention relates to the technical field of flame retardants, in particular to a phosphorus-nitrogen halogen-free flame retardant composition that utilizes inorganic phosphorous acid metal salts to improve thermal stability, and the phosphorus-nitrogen halogen-free flame retardant composition is used in the preparation of halogen-free Application in flame retardant glass fiber reinforced materials. Background technique [0002] Glass fiber reinforced thermoplastic engineering plastics are widely used in the field of electronic appliances because of their good rigidity and impact resistance, low warpage, high dimensional stability, good surface appearance, easy processing and recyclability. Applications in these fields require flame retardant materials, and thermoplastic 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 g...

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 thermoplastic engineering plastics

However, there are still some shortcomings in the phosphorus-nitrogen complex system based on aluminum diethyl hypophosphite, which are mainly manifested in: first, the two components will react and decompose at high temperature, resulting in a small amount of acidic substances. 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; third, the existence of MPP has a degrading effect on thermoplastic polymers. The obvious phenomenon is that the melt index of the material becomes larger, and It is easy to change color and has a great influence on the mechanical properties of the material, especially the impact performance of the material is greatly reduced

[0006] In general, the flame retardant systems currently used in glass fiber reinforced thermoplastic engineering plastics have problems such as color, generation of toxic gases, easy precipitation, corrosion, degradation, discoloration, and degradation of material mechanical properties. use, some lead to increased costs, reduced efficiency, etc.

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