Long glass fiber flame-retardant reinforced nylon 6 composite material without fibers exposed to surface and preparation method of material

Abstract

The invention relates to a long glass fiber flame-retardant reinforced nylon 6 composite material without fibers exposed to the surface and a preparation method of the composite material. The composite material is prepared from the following components in parts by weight: 30-80% of nylon 6, 10-60% of alkali-free long fibers, 2-10% of nano calcium carbonate, 1-3% of a main flame retardant, 0.5-1% of an auxiliary flame retardant, 2-5% of low viscosity nylon 6, 0.5-1% of a glass fiber modifier and 0.5-1% of other auxiliaries. The glass fibers provided by the invention have good compatibility with nylon 6 and are not exposed to the surface of the composite material and are smooth and attractive on the surface. By adopting double flame retardants, the flame retardance of the product is effectively improved and the flame retardance of the product can reach V-0 level, so that the composite material can be used on products such as home furnishing and offices and the like with relatively high surface smoothness or aesthetic measure and safety performance.

Description

technical field [0001] The invention relates to an organic polymer nanocomposite material, more specifically, to a long glass fiber flame-retardant reinforced nylon 6 composite material with no fiber exposed on the surface and a preparation method thereof. Background technique [0002] Nylon 6 is one of the most widely used engineering plastics. Its phthaloamide group is polar and has a strong hydrogen bond in its structure, which makes nylon 6 have a high melting point and good physical and mechanical properties. Performance and wear resistance, as well as self-lubricating properties, these comprehensive characteristics are not available in other plastics. However, the heat distortion temperature of pure nylon 6 is low, the water absorption is high, the impact strength before water absorption is low, the rigidity drops sharply after water absorption, and the size is unstable, which limits the application of nylon 6 and further reduces the downstream industry. Material sele...

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Problems solved by technology

[0003] At present, glass fiber reinforced nylon 6 is one of the most widely used engineering plastics, with high mechanical properties and heat distortion temperature, especially long glass fiber reinforced nylon 6 material, but due to the "wick" effect of glass fiber It makes the material more flammable, and the flame retardant performance does not meet the requirements of some industries, which limits its wider application, while the use of conventional halogen-free flame retardants is too expensive to promote; on the other hand, glass fiber reinforced nylon 66 While greatly improving the physical and mechanical properties of nylon 66, there is another obvious disadvantage, that is, because the two-phase interface between glass fiber and nylon 66 is not easy to combine well, it is easy to produce glass fiber exposure on the surface of the product, making the surface of the product rough and blooming. This limits the use of this raw material in products that require a high level of surface finish or aesthetics

[0004] At present, the industry has passed the research on long glass fiber reinforced flame retardant nylon composite materials. Among them, the Chinese invention patent CN102504529A is a kind of halogen-free flame retardant long glass fiber reinforced nylon 6 and its preparation method, which uses composite materials such as phosphate ester and attapulgite. Mechanical properties and flame retardant properties, the addition of inorganic materials affects the interface bonding between glass fiber and nylon, resulting in an uneven material surface; a glass fiber reinforced nylon 6 composite material and its preparation method and application in the Chinese invention patent CN102690512A, using glass Fiber dispersant, grafted polyolefin, grafted elastomer, glass fiber and other modified nylon, the product has good dispersibility, but the process is complicated, the cost is high and it is difficult to flame retard; The production process of nylon 66 uses glass fiber treatment agent, nucleating agent, heat stabilizer, and glass fiber filled nylon. The compatibility between glass fiber and nylon is good, but the product cost is high and the flame retardancy is poor; a kind of Chinese invention patent CN103013099A High fluidity long glass fiber reinforced nylon 6 material and its preparation method, using continuous glass fiber, lubricant, compatibilizer, antioxidant to modify nylon 6, the product has good fluidity and good appearance, but the cost is high and the flame retardancy is poor

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