Polyester resin composition as well as preparation method and application thereof

Abstract

The invention discloses a polyester resin composition which comprises the following components in parts by weight: 100 parts of PCT resin; 0-50 parts of a reinforcing material; and 0.1-0.8 part of a hyperbranched polyester; wherein the molecular weight of the hyperbranched polyester is 600-10000 g / mol, and the hydroxyl value of the hyperbranched polyester is 200-600 mg KOH / g. By adding specific parameters and a specific amount of hyperbranched polyester, the defect of insufficient dimensional stability of the PCT resin can be improved, and cold crystallization is inhibited.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyester resin composition and its preparation method and application. Background technique [0002] The birth of light-emitting diodes (LEDs) brought the lighting industry into the era of semiconductor lighting. LED light sources have the advantages of high reliability, high luminous power, low power consumption, fast response speed, long life, low price, and rich colors. Following gas lighting, incandescent and fluorescent lamps, LED has become a new generation of mainstream lighting technology. With the development of the times and the advancement of science and technology, LEDs have been widely used in various fields such as street lights, indoor lighting, backlight displays, car headlights, and landscape lights. [0003] The LED reflector is the main component to reflect the LED light source, and it needs to have good dimensional stability and high temperature...

AI Technical Summary

Problems solved by technology

However, the researchers found that because the PCT material is a semi-crystalline polymer, the cooling rate of the material is extremely fast under cold molding conditions, and the molecular chain mobility of the PCT material is insufficient, resulting in some molecular chains not being crystallized in time, causing incomplete crystallization

When the injection molded reflection bracket is dehumidified and baked at 160°C, the glass transition temperature of the PCT material is exceeded, the molecular chains of the material will move, and the molecular chains that have not crystallized in time will crystallize, that is, form cold crystallization, resulting in Shrinkage deformation occurs, and the dimensional stability of the product decreases

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