Nitrogen-free halogen-free flame-retardant complex system for glass fiber reinforced nylon and application of complex system

Abstract

The invention discloses a nitrogen-free halogen-free flame-retardant complex system for glass fiber reinforced nylon. The nitrogen-free halogen-free flame-retardant complex system comprises the following raw materials in percentage by weight: 60-90% of diethyl aluminum hypophosphite, 9-30% of aluminophosphite and 1-10% of zinc stannate. According to the nitrogen-free halogen-free flame-retardant complex system for glass fiber reinforced nylon disclosed by the invention, the nitrogen-free halogen-free flame-retardant complex system has the characteristics of being highly flame-retardant, migration-free, non-corrosive to equipment and the like, and the defects of the existing phosphorus and nitrogen complex flame-retardant system based on diethyl aluminum hypophosphite applied to the glass fiber reinforced nylon material are overcome. Moreover, the nitrogen-free halogen-free flame-retardant complex system can well adapt to a glass fiber reinforced nylon material system, and a halogen-free flame-retardant glass fiber reinforced nylon material with excellent overall performance is obtained.

Description

technical field [0001] The invention relates to the technical field of flame retardants, in particular to a nitrogen-free and halogen-free flame retardant composite system for glass fiber reinforced nylon and its application in halogen-free flame retardant glass fiber reinforced nylon materials. Background technique [0002] Glass fiber reinforced nylon is widely used in the field of electronic appliances because of its good rigidity and impact resistance, low warpage, high dimensional stability, and good surface appearance. Applications in these fields require flame retardant materials, and nylon is a flammable material. After compounding with glass fiber, glass fiber reinforced nylon is easier to burn due to the wick effect of glass fiber. Therefore, when glass fiber reinforced nylon is used in these fields, it is necessary to solve the problem of flame retardancy, and the existence of the wick effect makes it more difficult to flame retard. [0003] At present, the flame...

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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 and safety issues, so red phosphorus is not the best choice for glass fiber reinforced nylon

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 modulus of the product, there will be deposits on the mold, and 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 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

[0006] Generally speaking, the flame retardant system currently applied to glass fiber reinforced nylon has problems such as color, toxic gas, easy precipitation and corrosion. Some are fatal problems that make it impossible to use, and some lead to increased costs and reduced efficiency Wait

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