Ultraviolet-yellowing-resistant halogen-free flame-retardant thermoplastic elastomer composition and preparation method thereof

A thermoplastic elastomer, UV-resistant technology, used in the field of flame-retardant materials and flame-retardant compositions, can solve the problems of unsatisfactory yellowing resistance, unable to meet the long-term use of light-colored or white products without discoloration, etc.

Active Publication Date: 2021-05-11
HANGZHOU JLS FLAME RETARDANTS CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the peripheral lines of mobile phones and computers, light-colored or white products have gradually become the mainstream, but traditional halogen-free flame-retardant TPE-S materials mostly use ammonium polyphosphate system or polyphenylene ether PPE and phosphinate flame-retardant system. Both ammonium polyphosphate and polyphenylene ether will cause yellowing of the material under ultraviolet light, which cannot meet the requirements of long-term use of light-colored or white products without discoloration
Piperazine pyrophosphate is also used as a flame retardant, but piperazine pyrophosphate has a certain acidity, and the yellowing resistance is not ideal

Method used

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  • Ultraviolet-yellowing-resistant halogen-free flame-retardant thermoplastic elastomer composition and preparation method thereof
  • Ultraviolet-yellowing-resistant halogen-free flame-retardant thermoplastic elastomer composition and preparation method thereof
  • Ultraviolet-yellowing-resistant halogen-free flame-retardant thermoplastic elastomer composition and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the piperazine polyphosphate modified by metal ion comprises the steps:

[0034] 1. Salt forming step: put piperazine into the reaction vessel, slowly add polyphosphoric acid (P 2 o 5 The mass percentage is 79.5~86.8%), the mol ratio of the phosphorus atom in the system and piperazine is about 1.6-3:1 at this moment; The oxazine molar ratio is 0.05-0.1:1, continue to heat up to 140-150°C and react for 2-3 hours, then cool and pulverize to obtain the primary product of metal ion-modified piperazine polyphosphate;

[0035] 2. Polycondensation step: Heat the primary product of metal ion-modified piperazine polyphosphate under nitrogen protection to 190-210°C for 3-4 hours, cool and pulverize to obtain metal ion-modified piperazine polyphosphate, whiteness ≥95, the particle size D50 is 1.0-3.0μm, and the D98 is 7.0-18.0μm. It is a flame retardant and can be used to prepare halogen-free flame-retardant compositions. The addition amount is 25-40wt%...

Embodiment 2

[0037] A halogen-free flame-retardant thermoplastic elastomer composition resistant to ultraviolet yellowing, its raw materials include the following components by mass percentage:

[0038]

[0039] Among them, the metal ion-modified piperazine polyphosphate is mixed with a coupling agent (such as KH550) in a kneader at 90-110° C., cooled and pulverized, and sieved with 200 meshes for use. The feeding ratio of the coupling agent is 0.5wt% of the flame retardant. The above raw materials are put into a twin-screw extruder in proportion, and the halogen-free flame-retardant thermoplastic elastomer composition is obtained after extruding water-cooled strands and pelletizing. The twin-screw processing temperature is 180°C to 200°C, and the aspect ratio is 44:1. For other forms of flame retardants, those skilled in the art can make adaptive changes under the existing technology and teaching.

[0040]Among them, the molecular structure of the SEBS block copolymer is linear, the ...

Embodiment 3

[0048] Salt formation: Put 8.62Kg of piperazine into the horizontal reactor, slowly add polyphosphoric acid (P 2 o 5 Mass fraction = 84.03%) 17.32Kg, keep the temperature at 55±10°C, stir and react for 0.5 hours, add 0.81Kg of zinc oxide and stir evenly, heat up to 140-150°C, continue to react for 3 hours, cool and pulverize to obtain zinc ion modified Primary piperazine polyphosphate;

[0049] Polycondensation: The primary product of zinc ion-modified piperazine polyphosphate was reacted for 3 hours at 210°C under the protection of nitrogen, cooled and pulverized to obtain zinc ion-modified piperazine polyphosphate halogen-free flame retardant.

[0050] Product morphology description: whiteness 97, particle size D50=2.7μm, D98=12μm.

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Abstract

The invention discloses an ultraviolet-yellowing-resistant halogen-free flame-retardant thermoplastic elastomer composition and a preparation method thereof. The preparation method comprises the following steps: stirring polyphosphoric acid, piperazine and a metal salt according to a specific ratio to obtain a metal ion modified piperazine phosphate halogen-free flame retardant, conducting treatment with a coupling agent, and adding SEBS, PP and maleic anhydride grafted LLDPE to form the halogen-free intumescent flame-retardant composition with excellent ultraviolet yellowing resistance. The composition retains excellent mechanical properties and flame retardancy at the same time, especially greatly improves the yellowing resistance, and meets the requirements of current electronic products on halogen-free flame-retardant plastics.

Description

technical field [0001] The invention relates to the fields of flame-retardant materials and flame-retardant compositions, in particular to a thermoplastic elastomer composition resistant to ultraviolet yellowing and halogen-free flame-retardant and a preparation method thereof. Background technique [0002] Since PVC and other halogen-containing flame-retardant polymer materials will produce a lot of black smoke during combustion, they will also produce a large amount of harmful gases and substances such as hydrogen halide, polluting the surrounding environment. Therefore, from the perspective of protecting the environment and human health, the European Union and the United States have issued relevant regulations and standards to prohibit the use of certain halogenated flame retardants in electrical and electronic products. The substitution of PVC materials in the electrical and electronic industries is in full swing. At present Manufacturers of mobile phones, computers and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/02C08L23/12C08L51/06C08K3/32C08K5/3462C08K9/06
CPCC08L53/025C08L23/12C08L2201/02C08L2201/22C08L2205/03C08L2207/04C08L2201/08C08K2003/329C08K2201/005C08L51/06C08K9/06C08K3/32C08K5/3462
Inventor 王益锦邵江斌裘雪阳施寅斌
Owner HANGZHOU JLS FLAME RETARDANTS CHEM
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