Method for promoting high temperature heat stability of melamine derivative fire retardant by utilizing inorganic and alkyl metallic phosphites, product and application thereof

Abstract

The invention discloses a method for promoting high temperature heat stability of a melamine derivative fire retardant by utilizing inorganic and alkyl metallic phosphites. The method comprises the step of adding a compound of inorganic metallic phosphite and alkyl metallic phosphite into raw materials; the addition of the compound is 0.1-40%, on the basis of the total weight of the melamine derivative fire retardant; the weight ratio of inorganic metallic phosphite to alkyl metallic phosphite is at 1:(1-10); the structural formula of alkyl metallic phosphite is shown by formula (I) or (II); Ris selected from straight chain fat alkyl with 1-6 aryl groups or carbons and Me is selected from zinc, calcium or magnesium. According to the method disclosed by the invention, the melamine derivative has high thermal decomposition temperature and can overcome the defects of decomposition and degradation of substrate polymer, migration, corrosion to equipment, and the like, of fire retardant, and meanwhile, the property of fire retardant is maintained, the synergistic anti-flaming effect with other fire retardants is maintained and the application field of fire retardant is widened.

Description

technical field [0001] The present invention relates to the technical field of flame retardants, in particular to a method for improving the high-temperature thermal stability of melamine derivative flame retardants by using inorganic and alkyl phosphorous acid metal salts, and the melamine with high-temperature thermal stability prepared by the method Derivative flame retardants and applications of the flame retardants. Background technique [0002] Melamine derivatives, due to their high nitrogen content, are usually used as flame retardants or synergistic flame retardants, especially in the field of halogen-free flame retardants, which can be used alone or in combination with phosphorus-containing flame retardants, or It condenses itself with phosphorus-containing compounds and has a high synergistic flame-retardant effect. It is currently widely used in the flame-retardant of polymer materials. Melamine derivative flame retardants, typical representatives such as melami...

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Problems solved by technology

[0003] However, there is a typical problem in the use of this type of compound, that is, in the process of high temperature processing, especially under the action of high temperature and screw shear force, it is easy to decompose, and the decomposition of flame retardants is easy to cause the following problems: Mainly manifested in: 1. It is the acidic component produced by decomposition that will lead to the degradation of the matrix polymer. The obvious phenomenon is that the melt index of the material becomes larger, and it is easy to change color, which has a great impact on the mechanical properties of the material, especially the impact performance of the material. Second, high temperature These acidic components produced by decomposition will corrode the metal parts of the equipment, and parts need to be replaced after a certain period of time, which will increase agency costs and reduce production efficiency. Larger smog is produced, which affects the processing environment and workers' health; fourth, the small molecular substances produced by decomposition accelerate the risk of precipitation. During the injection molding process, after injection molding a product with a certain modulus, there will be deposits on the mold , the existence of these deposits will affect the appearance of the product. At this time, it is necessary to stop the work to clean the mold, which will also reduce the production efficiency. At the same time, this precipitation will also cause the flame retardant to migrate to the surface of the product, resulting in uneven distribution and loss of the flame retardant. In the end, the flame retardancy of the material will fail, and there will be safety hazards

[0005] Although there are a large number of commercial heat stabilizers or antioxidant products for polymers, the effect on melamine derivatives is not obvious, and a large number of organic antioxidants, such as hindered phenols, phosphates, etc., have limited temperature resistance. In a high temperature environment, it is first destroyed and loses its effect

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