Low-temperature-resistant super-tough halogen-free flame-retardant nylon alloy and preparation method thereof

Abstract

The invention discloses a low-temperature-resistant super-tough halogen-free flame-retardant nylon alloy and a preparation method thereof. The nylon alloy comprises, in weight percent, 50-80% of nylonresin, 10-20% of toughening agents, 2-10% of reinforcing agents, 5-10% of flame retardants, 0.1-1% of antioxidants, 0.2-2% of light stabilizers, 1-3% of flame-retardant synergist and 1-3% of processing additives. The flame resistance of the nylon alloy can reach grade V0, the tensile strength is higher than 70MPa, simply-supported beam notch impact strength can reach 70KJ / m<2> at indoor temperature, and the strength can reach 20KJ / m<2> at low temperature. The flame resistance, the tensile property and the impact property of products are effectively balanced, comprehensive performances are good, and the nylon alloy effectively meets the use requirements of special engineering plastics for low temperature resistance in Chinese alpine regions and other extreme environments and can be widelyapplied to the fields of automobiles, electronics, machinery, rail traffic, sports equipment and the like.

Description

technical field [0001] The invention belongs to the field of polymer material modification, and in particular relates to a low-temperature-resistant super-tough halogen-free nylon alloy and a preparation method thereof. Background technique [0002] Nylon is a widely used engineering plastic with good mechanical properties, heat resistance, wear resistance, chemical solvent resistance, self-lubrication and certain flame retardancy, excellent processing performance, and can be integrated into complex molding The structural components are widely used in automobiles, electronic appliances, machinery, rail transit, sports equipment and other fields. However, due to the influence of environment and temperature, its performance will change greatly, which hinders its development and application, and its modification can significantly improve its comprehensive performance. [0003] With the development of the high-end equipment manufacturing industry vigorously promoted by the coun...

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Problems solved by technology

However, due to the influence of environment and temperature, its performance will change greatly, which hinders its development and application, and its modification can significantly improve its comprehensive performance.

[0003] With the development of the high-end equipment manufacturing industry vigorously promoted by the country, the performance requirements of modified nylon and other engineering plastics are getting higher and higher, but most domestically produced modified nylon products have properties such as low temperature resistance, toughness, and mechanical strength. Uncoordinated, the specific performance is: low temperature resistance, high toughness products have poor mechanical strength, high mechanical strength products have poor toughness; if you want to achieve flame retardant effect, you need to add flame retardants, but the addition of flame retardants will lead to nylon Decreased mechanical properties such as impact strength and bending strength

The main reason is that the synergy and compatibility between the various functional additives are poor, which leads to the product being easily damaged during use and the service life is very short

[0004] At present, domestic patents CN1290594A, CN101870811A, etc. disclose the preparation method of maleic anhydride grafted polyolefin material to toughen nylon, and the toughness of nylon is enhanced by adding more polyolefin, but practice has proved that with the increase of polyolefin addition, the product The mechanical strength of the product drops sharply, and the overall performance of the product is not good

CN102690512B, CN102558843B, etc. disclose the preparation method of toughened nylon reinforced with glass fiber. Although the obtained product has high tensile strength, its Charpy notched impact strength is relatively poor, especially at a low temperature of -40°C. The notched impact strength is only 10KJ / m 2 about

[0005] In order to solve the above problems, CN103421309B discloses a cold-resistant and super-tough reinforced nylon 6 material for automobiles and a preparation method thereof, which solves the problems between the toughening agent and the glass fiber interface and the toughening agent and the nylon interface by preparing a modified precursor in the early stage. For compatibility issues, the -40°C notched impact strength has been increased to 20KJ / m 2 or so, but this method requires a higher amount of modified precursor, the performance of the product is better, and the flame retardant effect of the product is not good, the overall performance is not balanced enough,

[0006] The special engineering plastics used in my country's alpine regions and other extreme environments such as the North and South Poles have high requirements for the balance performance of the products. The existing nylon products may have poor impact resistance, easy cracking, and long service life under ultra-low temperature conditions. The problem of short length, or the mismatch of strength, toughness and flame retardancy, etc., cannot meet the special requirements of nylon products in my country's alpine regions.

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