High-temperature nylon composite material with low water absorption and preparation method of high-temperature nylon composite material

Abstract

The invention provides a high-temperature nylon composite material with low water absorption and a preparation method of the high-temperature nylon composite material. A formula of the composite material comprises components in parts by weight as follows: 24-60 parts of PA6T, 10-20 parts of PTT, 1-5 parts of a PTT-PA6T copolymer, 0.2 parts of a main antioxidant, 0.3 parts of an auxiliary antioxidant, 40 parts of glass fiber, 0.5 parts of a lubricant and 0-0.5 parts of other aids. The preparation method comprises the steps as follows: firstly, PA6T, PTT and the PTT-PA6T copolymer are dried in avacuum oven at 100 DEG C for 8 h, then, the prepared materials are uniformly mixed in a high-speed mixer in proportion, and extrusion granulation is performed by twin screws at 230-290 DEG C at 200-300 rad / s. Compatibility of high-temperature nylon with PTT is realized by directly adding PTT with low water absorption to PA6T. The PTT-PA6T copolymer is synthesized through polymerization and addedto PA6T and PTT, and mechanical performance is improved by improving the compatibility of PA6T and PTT.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a low water absorption nylon composite material and a preparation method thereof. Background technique [0002] When high-temperature nylon PA6T is used for heating and foaming test of SMT parts (test conditions: put the sample in cold water for one day, take it out for testing at 275°C), PA10T can pass, PA6T cannot pass, because PA6T water 0.5% in cold water, PA10T Water absorption is 0.2%. There are many PA6T manufacturers, and the price is lower than that of PA10T. After solving the water absorption performance, it can reduce the difficulty of PA6T processing and pass the SMT air bubble test. At present, the injection-molded PA6T product is sealed to control moisture absorption during the production process to prevent moisture absorption. However, most SMT connectors have complicated manufacturing processes, and the products are exposed to the air for a long time, so moi...

AI Technical Summary

Problems solved by technology

CN102757640A discloses a thermally conductive nylon composite material, which greatly improves the physical and mechanical properties of the product, thereby solving the problem that the high filling amount of the thermally conductive component has too much influence on the physical properties of the material

[0004] However, none of the above-mentioned published technologies involves the problem of how to reduce water absorption under the situation of using low-cost PA6T

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