Highly-anti-yellowing anti-precipitation halogen-free flame-retardant thermoplastic elastomer composition and preparation method thereof

Abstract

The invention discloses a highly-anti-yellowing anti-precipitation halogen-free flame-retardant thermoplastic elastomer composition and a preparation method thereof. The highly-anti-yellowing anti-precipitation halogen-free flame-retardant thermoplastic elastomer composition comprises the following raw material components by mass percentage: 15-30% a styrene-based thermoplastic elastomer, 10 to 25% of polyolefin resin, 15 to 25% of a plasticizer, 10 to 20% of a char forming agent, 15 to 30% of a phosphorus-nitrogen flame retardant, 0.5 to 3% of a flame retardant synergist, 0.1 to 1% of an anti-oxygen agent, 0.1 to 1% of an anti-aging agent and 0.1 to 1% of a processing aid. Through high char forming property of crosslinked polystyrene powder, a triazine char forming agent is compounded, the triazine char forming agent replaces traditional polyphenylene ether to act as the char forming agent of the thermoplastic elastomer TPE, and the highly-anti-yellowing anti-precipitation halogen-free flame-retardant thermoplastic elastomer composition has good flame retardant property and physical property, solves the problem that use of the polyphenylene ether is liable to cause yellowing, hasexcellent UV resistance, and can pass anti-precipitation tests with higher requirements.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a high-yellowing-resistant, precipitation-resistant, halogen-free flame-retardant thermoplastic elastomer composition and a preparation method thereof. Background technique [0002] Thermoplastic Elastomer (TPE) is soft in texture, comfortable to the touch, wide in hardness range, good in processability, and does not contain halogen. However, it is generally required to be flame-retardant when used in the field of consumer electronics, and TPE itself has a low oxygen index and is easy to burn, so flame-retardant modification is required. [0003] At present, the halogen-free flame retardant modification of TPE has been relatively mature, mainly divided into the following three systems: the first is a flame retardant system filled with a large amount of inorganic fillers such as magnesium hydroxide, although the product has good anti-yellowing performance, However, this system ne...

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Problems solved by technology

However, it is generally required to be flame retardant when used in the field of consumer electronics, and TPE itself has a low oxygen index and is easy to burn, so flame retardant modification is required

[0003] At present, the halogen-free flame retardant modification of TPE has been relatively mature, mainly divided into the following three systems: the first is a flame retardant system filled with a large amount of inorganic fillers such as magnesium hydroxide, although the product has good anti-yellowing performance, However, this system needs to be filled with a large amount of inorganic fillers to achieve a good flame retardant grade. The flame retardant efficiency is low, the mechanical strength is poor, and it is not easy to process. It is generally used in occasions that require high smoke density; the second is to expand Type flame retardant system based flame retardant system, the system uses such as APP (ammonium polyphosphate), piperazine pyrophosphate, pentaerythritol, tris (2-hydroxyethyl) isocyanurate, melamine pyrophosphate and other small Molecular flame retardants have good flame retardant performance and good anti-UV discoloration performance. However, since the flame retardants are easily hydrolyzed or highly hydrophilic substances, the flame retardants are easy to precipitate during the use of the product. Although the formula adjustment can Pass the 70℃×168h water boiling precipitation test (for example, the patent number is CN102618015B), but for wires with higher requirements (such as needing to pass 80℃×168h water boiling without precipitation), it cannot meet the use requirements; the third is polyphenylene Ether resin PPO and hypophosphite or alkyl phosphinate-based flame retardant system, the system is made by adding high temperature resistant, high flame retardant PPO, and hypophosphite or alkyl hypophosphite, melamine cyanuric acid Salt and other flame retardants have a synergistic effect, good flame retardant performance, and the product has good heat resistance, good precipitation resistance, and high mechanical strength, but polyphenylene ether resin has poor UV resistance and is prone to yellowing, which affects Although the appearance of the final product can be improved by filling a large amount of titanium dioxide, it sacrifices the processing performance and mechanical properties, and also deteriorates the flame retardancy

In summary, with the current flame retardant system, it is difficult to achieve a halogen-free flame retardant TPE with high resistance to precipitation and excellent UV yellowing resistance, so it is of great significance to develop a new flame retardant system

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