Thermoplastic resin composition, preparation method and applications thereof

Abstract

The invention discloses a thermoplastic resin composition, which comprises the following components in parts by weight: 5 to 60 parts of polyamide resin, 1 to 10 parts of polyol, and 0.5 to 79 parts of compound containing carbonyl group; on the basis of the total weight of the compound containing carbonyl group, according to the GB / T6324.5-2008 or element analysis method, the measured carbonyl group content is in a range of 10 to 70 wt%, the preferable content is 25 to 60 wt%, and the more preferable content is 30 to 50 wt%. According to the provided preparation method, a compound with a certain ratio of carbonyl group is added to prepare the thermoplastic resin composition; compared with the conventional thermoplastic resin composition, which only contains a specific amount of polyol, the prepared thermoplastic resin composition has an excellent performance on resisting thermo-oxidative aging, wherein the performance is represented by the tensile strength retention rate after thermo-oxidative aging; the provided thermoplastic resin composition is exposed in an environment cabinet with a humidity of 85% and a temperature of 85 DEG C for seven days, the phenomenon of precipitation and whitening does not appear; while conventional thermoplastic resin composition that does not contain the compound containing carbonyl group easily transfers to the surface of mould parts namely precipitation and whitening, and the provided thermoplastic resin composition avoids the phenomenon mentioned above.

Description

Technical field [0001] The invention relates to the technical field of modified thermoplastic resin compositions, in particular to a thermoplastic resin composition with excellent heat-resistant oxygen aging performance and anti-precipitation whitening, and a preparation method and application thereof. Background technique [0002] Polyamides have excellent mechanical properties, chemical resistance, processability, and heat and oxygen aging properties, so they are often used in the electronic and electrical and motor vehicle industries that have strict requirements on the working environment, including applications around motor vehicle engines. Especially common. The demand for high temperature resistance of materials in the automotive field is becoming more and more obvious. This is based on the fact that the temperature in the surrounding area of ​​the car engine is usually higher than 150℃, especially for turbocharged engines, the temperature is even higher than 180℃ or even ...

AI Technical Summary

Problems solved by technology

However, for coolants used to store or transport heat, it usually involves contact with ethylene glycol and / or water. Since the polyamide composition is plasticized by water or ethylene glycol, the polyhydroxyl structure in the composition is put into Increased freedom of movement of the molecules, these polyhydric structures put into the molecules, are extracted after long-term alcoholysis tests, which is not conducive to the long-term thermo-oxidative stability of polyamide compositions involved in this application

And the use of such polyhydroxy polymers with molecules containing polyhydroxy structures will further improve the original high moisture absorption rate of nylon, resulting in attenuation of mechanical properties and thermal properties.

Images