Polyamide resin composition and preparation method thereof

Abstract

The invention discloses polyamide resin composition and a preparation method thereof. The polyamide resin composition is prepared from the following components in parts by weight: 5-15 parts of polyamide resin, 0.1-5 parts of a metal salt compound and 35-80 parts of a keto-carbonyl polymer. The composition is selected from compounds containing repeating units derived from olefinic comonomers and ketone units derived from alternating structures of carbon monoxide repeating units, and the keto-carbonyl content of the keto-carbonyl polymer is 15wt%-80wt%, preferably 30wt%-50wt%, and the number-average molecular weight is higher than or equal to 1*10<4> and lower than or equal to 3*10<5>. Metal elements of the metal salt compound are at least one selected from main groups I-II and subgroups I-II, and anions paired with metal ions are at least one selected from halogen ions and acetate ions. The prepared polyamide resin composition has the advantages of excellent long-term thermo-oxidativeaging resistance, excellent damp-heat aging resistance at 85 DEG C under the condition of relative humidity being 90%, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of polymer chemistry, in particular to a polyamide resin composition and a preparation method thereof. Background technique [0002] Due to their excellent mechanical properties, chemical resistance, processability, and heat-oxidative aging resistance, polyamides are often used in the electronics and motor vehicle industries that have strict requirements on the working environment. Among them, the applications around the motor vehicle engine Very common. The demand for high temperature resistance of materials in the field of motor vehicles is becoming more and more obvious. This is based on the fact that the temperature in the surrounding area of ​​the automobile engine is usually higher than 150 ° C, especially for engines with turbocharged air intake, the temperature is even higher than 180 ° C or even High temperature above 200°C. As polyamide compositions are often used at such service temperatures, th...

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Problems solved by technology

However, the amount of polyol added is high and the cost is high. Moreover, its heat and oxygen aging resistance will gradually decrease and be extended to 21 days when it is treated under more stringent test conditions (85°C and 90% relative humidity) for 14 days. It was found that its heat and oxygen aging resistance will be greatly reduced because of its poor long-term moisture and heat aging resistance under this condition

Therefore, its scope of application is limited

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