High-flow and temperature-resisting PPO/PA composition for LEDs and preparation method thereof

Abstract

The invention relates to a high-flow and temperature-resisting PPO/PA composition for LEDs and a preparation method thereof. The PPO/PA composition comprises the following components by mass percent: 20-50 percent of polyphenyl ether, 20-50 percent of polyamide, 2-8 percent of a compatilizer, 5-15 percent of a fire retardant, 2-15 percent of polyolefin, 10-25 percent of titanium dioxide, 2-10 percent of a flexibilizer, 1-4 percent of a dispersant, and 0.2-0.6 percent of an antioxygen; the preparation method comprises the following steps: drying titanium dioxide, adding the dispersant, polyphenyl ether, polyamide, compatilizer, flexibilizer and antioxygen, and adding the components from a main feed opening of a twin-screw extruder; after the fire retardant and polyolefin are mixed according to a ratio, adding the mixture by a feed pump from a fourth-section cylinder of the twin-screw extruder; extruding and pelleting, so that the composition is prepared. The high-flow and temperature-resisting PPO/PA composition for LEDs has superior heat resistance, superhigh shading performance and excellent flowability, as well as favorable fire resistance and size stability, meets the requirement of ROHS and Reach regulations, and facilitates the realization of the production of products such as LED nixie tubes with the thickness of 0.2 mm and lattice modules.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a PPO / PA composition for high-fluidity and temperature-resistant LEDs and a preparation method thereof. Background technique [0002] Polyphenylene ether (PPE or PPO for short) is a high-performance thermoplastic engineering plastic with good mechanical properties, chemical stability, dielectric properties, heat resistance and flame retardancy, but the rigidity of the PPO molecular chain is relatively high. Large, notch impact is very sensitive, its high melt viscosity makes it impossible for injection molding and PPO's poor oil resistance and other shortcomings greatly limit its application. Usually PPO and other polymer materials are used as a composition, and the common ones are PPO / HIPS composition, PPO / PA composition, etc. [0003] In the existing invention technology, the high light-shielding PPO composition for LED is mainly the composition of PPO and H...

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Problems solved by technology

[0003] In the existing invention technology, the high light-shielding PPO composition for LED is mainly the composition of PPO and HIPS. This composition has poor temperature resistance, and the LED industry has higher and higher requirements for temperature resistance of materials.

For example, the patent CN101195704A discloses a PPO / HIPS composition, but the temperature resistance of this material is not high, and the dispersibility is not ideal, and the performance is low

For the LED industry, on the premise of meeting the shading properties, the thinner the product, the better. This requires that the materials used have high shading properties and high fluidity to meet the injection molding requirements of thin-walled products, such as A PPO / HIPS composition disclosed in patent CN101307179A, although LLDPE or TPE is used as fluidity improvement and toughening agent, the impact performance and fluidity of the material are still not ideal, and can only meet the production of 0.3MM thin-walled products , and the PPO / HIPS composition is used, the temperature resistance of the material is still unsatisfactory; another example is the patent CN103021281A which discloses a PPO high light-shielding material for LED displays, which uses PPO and titanium dioxide as coverings, although the temperature resistance of the material There are improvements, but the well-known pure PPO has poor fluidity and cannot be injection molded, so it cannot meet the injection molding requirements of thin-walled products. At the same time, due to its poor fluidity, the dispersion of the covering in the resin is poor, and the covering power is not ideal and higher production costs

[0004] The Chinese patent application number 200810067341.5 discloses a flame-retardant PPO / PA alloy and its preparation method, using the following components and formulations: PPO30-50, PA10-60, toughening agent 3-15, composite flame retardant 5- 15. Compatibilizer 3-10, other additives 0.5-2, although it is a flame-retardant PPO / PA alloy material, but this material does not have light-shielding properties, and cannot meet the high light-shielding requirements of the LED industry for materials used

Secondly, the use of nitrogen-phosphorus compound flame retardants will significantly reduce the flow properties and mechanical properties of the material

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