Polyester resin composition, application thereof and molded product

Abstract

The invention discloses a polyester resin composition, application thereof and a molded product. The polyester resin composition comprises the following components: 0-55 parts of polyester resin A with the melting temperature being more than 280 DEG C and less than 290 DEG C; 5-60 parts of polyester resin B with the melting temperature being greater than 290 DEG C and less than 300 DEG C; 5-60 parts of a white pigment; 0.1-5 parts of an inorganic nucleating agent; and 1-40 parts of filler. According to the invention, the polyester resin B with high crystallization capacity is compounded with the inorganic nucleating agent, so that the crystallization performance of the polyester resin composition can be greatly improved, the minimum curing time required by normal cooling and demolding of the molded product in the injection molding process is greatly shortened, and the development requirements of ultra-multi-mold-cavity and rapid cooling of a LED reflection support material can be wellmet; and meanwhile, the problem of interface micro-stripping between LED packaging silica gel and a metal material belt in the functional area can be well solved, and the ultrasonic scanning layeringresistance and the long-term use reliability are greatly improved.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a polyester resin composition, its application, and a molded product. Background technique [0002] Compared with polyamide compositions, polyester compositions have excellent discoloration resistance, so that high heat-resistant polyester compositions have been widely used in light-efficient LED components. However, the crystallization performance of the polyester composition deviates, and under the same mold cooling conditions, the polyester composition requires a longer cooling time to be normally released from the mold. Especially when the molding of the LED reflective bracket material is developing towards multi-cavity rapid prototyping, the molding defect of the polyester composition becomes more and more obvious. This largely limits the development of polyester compositions as LED reflective bracket materials. [0003] In the prior art, the crystalliza...

AI Technical Summary

Problems solved by technology

However, during the whole process of LED packaging and long-term use, LED lamp beads are constantly affected by complex external conditions such as heat, oxygen, light, and moisture. If the design or material selection is improper, it will easily lead to dead light failure.

One of the most common causes of failure is that the interface between the LED packaging silica gel and the metal strip in the functional area is slightly peeled off, and external h