Resin Composition Weather Resistance
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Solution Overview
Problem
Poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin lacks weather resistance and low-temperature impact resistance while maintaining chemical resistance and impact resistance at room temperature, necessitating a novel resin composition that addresses these issues through polymer alloying with a polycarbonate resin.
Innovation Solution
A resin composition containing 60% to 95% poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin and 5% to 40% polycarbonate resin, with a melt viscosity ratio of 2.0 or more at 280°C and the addition of UV absorbing agents or hydrolysis inhibitors to enhance weather resistance and low-temperature impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin is used, then chemical resistance and impact resistance at room temperature are maintained, but weather resistance and low-temperature impact resistance are insufficient
Solution Approach 1:
The patent applies composite materials by combining poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin with polycarbonate resin in a specific ratio (60-95% copolyester and 5-40% polycarbonate). This composite resin composition leverages the chemical resistance of the copolyester while incorporating polycarbonate's superior weather resistance and low-temperature impact resistance, thereby resolving the contradiction between maintaining chemical resistance and improving weather resistance.
2Strength
If poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin is used, then impact resistance at room temperature is maintained, but low-temperature impact resistance is insufficient
Solution Approach 1:
The patent uses composite materials by formulating a resin composition that combines poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin with polycarbonate resin. The polycarbonate component contributes excellent low-temperature impact resistance, while the copolyester maintains room-temperature impact resistance. This composite approach allows the material to perform reliably across a wide temperature range, from low temperatures to room temperature.
3Strength
If polycarbonate resin is used for helmet material, then mechanical strength and heat resistance are achieved, but chemical resistance is insufficient
Solution Approach 1:
The patent applies composite materials by creating a resin composition that combines polycarbonate resin with poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin. The polycarbonate provides high mechanical strength and heat resistance, while the copolyester component contributes excellent chemical resistance. This composite formulation allows the helmet material to simultaneously achieve mechanical strength, heat resistance, and chemical resistance that neither material could provide alone.
Data Source
AI summary
Provided is a resin composition having weather resistance and low-temperature impact resistance, which are the problems of a poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin, and sustaining the chemical resistance and room-temperature impact resistance of poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin. It is a resin composition containing a poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin and a polycarbonate resin, in which the poly(1,4-cyclohexylene dimethylene terephthalate) copolyester resin is contained at 60 to 95% by weight and the polycarbonate resin is contained at 5 to 40% by weight.