Environment-friendly halogen-free flame retardant for glass fiber reinforced PA6 (polyamide) and preparation method thereof

Abstract

The invention discloses an environment-friendly halogen-free flame retardant for glass fiber reinforced PA6 (polyamide) and a preparation method thereof. The environment-friendly halogen-free flame retardant for glass fiber reinforced PA6 consists of the following raw materials, by weight, 10-12 parts of aluminum phosphate, 4-5 parts of melamine cyanurate, 1-3 parts of ammonium polyphosphate, 0.5-3.0 parts of association-effect carbonatic, 0.5-3.0 parts of flame-retardant association effect agent and 0.2-1.0 part of anti-oxidizer, wherein the aluminum phosphate is prepared by phosphoric acid and aluminum hydroxide. The environment-friendly halogen-free flame retardant has the advantages of excellent flame-retardant function and low fuming quantity, can be used for retarding the glass fiber reinforced PA6 by substituting for antimony and bromide flame retardant, and is higher in cost performance when being compared with the antimony and bromide flame retardant in the aspect of cost andlower in usage when in application as compared with antimony and bromide flame retardant and is prior to the like products of antimony and bromide in indexes of environment protection. Besides, the environment-friendly halogen-free flame retardant can completely substitute for the antimony and bromide flame retardant and has higher flame retardant level.

Description

technical field [0001] The invention relates to a novel phosphorus and nitrogen series environment-friendly halogen-free flame retardant, which is used for glass fiber reinforced nylon 6 (PA6). Background technique [0002] Nylon, or polyamide (PA), is a polymer compound containing amide groups (-NHCO-) ​​in the main chain. It is an important engineering resin, ranking first among the five general-purpose engineering plastics. It is widely used in daily life and industrial fields widely. According to the number of carbon atoms in the polyamide unit chain, it can be divided into PA6, PA66, PA46, etc. Among them, PA6 and PA66 are the most widely used and the largest output. PA6 has good comprehensive performance. However, because of the hydrophilic amide group in its molecular structure, it is easy to absorb water and moisture, resulting in a decrease in the mechanical strength of the product and affecting the dimensional stability. Although PA6 has a certain self-extinguish...

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Problems solved by technology

However, because of the hydrophilic amide group in its molecular structure, it is easy to absorb water and moisture, resulting in a decrease in the mechanical strength of the product and affecting the dimensional stability. Although PA6 has a certain self-extinguishing property, it is still combustible. In the live working environment, the danger of fire caused by leakage, short circuit, arc and electric spark still exists. The use of glass fiber (referred to as glass fiber) can overcome the lack of mechanical properties of PA6, but the addition of glass fiber makes PA6 less The "wick effect" is more flammable, so since the 1970s, countries around the world have conducted extensive research on improving the flame retardancy of nylon

[0003] At present, 70% of the flame retardants used in flame-retardant PA6 are halogen-containing flame retardants. Although halogen-containing flame retardants have good flame-retardant effects, they release a large amount of smoke and toxic gases to irritate the eyes and respiratory system, causing "Secondary damage"

In particular, polybrominated diphenyls will produce diphenyls, which may have carcinogenic effects on the human body. Therefore, the application of halogen-containing flame retardants is greatly restricted, and the development of feasible halogen-free flame retardants is bound to become a top priority.

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