A kind of polyester composition for reflecting plate
A composition and reflective plate technology, applied in the field of polymer materials, can solve the problems of unfavorable high temperature resistance and discoloration, affecting the curing effect of silica gel, etc., and achieve the effects of good mold filling fluidity, good curing, and low yellowing resistance
Active Publication Date: 2017-05-31
KINGFA SCI & TECH CO LTD
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Problems solved by technology
If the phosphorus content is too low, it is unfavorable to the high temperature discoloration resistance of the polyester composition for reflectors; but if the phosphorus content exceeds a certain amount, it will also affect the curing effect of the silica gel during the encapsulation process
Method used
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Embodiment 1~8 and comparative example 1~4
[0053] Embodiment 1~8 and comparative example 1~4: the preparation of polyester composition and sample
[0054] Use a high-speed mixer to mix the dried polyester resin with phosphorus-containing compounds, nucleating agents, lubricants, etc., and add it from the main feeding port of the twin-screw extruder, and add titanium dioxide and glass fiber to the twin-screw through the side feeder extruder, at a set temperature of 200-300°C, melt extrusion and granulation through a twin-screw extruder to obtain a granular polyester composition; then dehumidify and dry the obtained granular polymer composition at 110°C for 5 hours, and then At the set temperature of 240~305°C, the samples required for the relevant mechanical properties, whiteness and silicone curing tests were prepared by injection molding. The test results are shown in Table 1.
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Abstract
The invention discloses a polyester composition for a reflecting plate. The polyester composition comprises the following components in parts by weight: (A) 100 parts of polyester resin of which the melting point (Tm) is higher than 220 DEG C, and (B) 9-300 parts of a white pigment (B1) and / or a reinforcing filler (B2), wherein the polyester composition is characterized in that the melt viscosity which is tested when the shearing rate is 1,000s<-1> and the temperature is 300 DEG C according to the test standard ISO 11443 is 50-300Pa.s; and on the basis of the weight of all components, the phosphorus content of the polyester composition is 50-4,000ppm. By virtue of the polyester composition with specific melt viscosity and specific phosphorus content, the polyester composition disclosed by the invention has the characteristics of good mold filling fluidity, good reflectivity, low hygroscopicity and yellowing resistance, and can meet the requirements of actual production; and silica gel is well solidified when be encapsulated.
Description
technical field [0001] The invention relates to the field of polymer materials, in particular to a polyester composition for a reflection plate. Background technique [0002] Due to its low energy consumption, durability, and high design flexibility, LED light sources have been increasingly used in daily life, such as light sources for LED TVs, LED lighting, automotive lighting, and traffic lights. As an indispensable accessory of LED light sources, LED reflectors are prone to yellowing when exposed to light and heat for a long time. For example, in the process of LED packaging, LED components will experience high temperatures higher than 260°C; The temperature of the car headlights will exceed 80°C during use. If the reflector turns yellow due to heat during packaging and use, it will eventually affect the light extraction efficiency of the LED light source. [0003] Usually, the LED reflector is a polyamide resin composition, but because of the presence of amide bonds, p...
Claims
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IPC IPC(8): C08L67/02C08K13/04C08K3/22C08K7/14C08K3/34C08K7/08C08K3/32C08K5/521
Inventor 易庆锋蒋智强姜苏俊张传辉曾祥斌蔡彤旻
Owner KINGFA SCI & TECH CO LTD
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