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Halogen-free phosphorus-free flame-retardant thermoplastic alloy and preparation method thereof

A thermoplastic and thermoplastic elastomer technology, which is applied in the field of halogen-free and phosphorus-free flame-retardant thermoplastic alloys and their preparation, can solve the problem of reducing the thermal stress cracking resistance and tear resistance of products, reducing the mechanical properties of materials, and mechanical decomposition of materials overheating, etc. problems, achieve good physical and chemical properties, reduce toxic emissions, and improve flexibility

Pending Publication Date: 2020-04-10
FAR EAST CABLE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this will significantly reduce the mechanical properties of the material, increase the hardness of the material, reduce the heat stress cracking resistance and tear resistance of the product, and have poor processing fluidity, low plasticizing performance, strong heat sensitivity, shear heat generation, and easy to cause material damage. Overheated mechanical decomposition, resulting in rough product surface, pores and other undesirable phenomena
[0005] Commonly used intumescent flame retardants are less added and have good flame retardant effects, but most intumescent flame retardants contain phosphorus compounds, which will increase the amount of smoke generated by the material when burned

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] A preparation method of a halogen-free and phosphorus-free flame-retardant thermoplastic alloy, comprising the following methods: S1, weighing each component according to the above-mentioned proportion; S2, putting each component into an internal mixer, mixing by the internal mixer, extruding out of granulation to obtain a thermoplastic alloy.

[0032] Before each component is added to internal mixer in above-mentioned steps S2, calcium gluconate is carried out pretreatment earlier, and the method for its pretreatment comprises the following steps:

[0033] Step S21, adding calcium gluconate into a ball mill and grinding for 30 minutes to obtain calcium gluconate ball mill powder;

[0034] Step S22, adding calcium gluconate ball mill powder into a spray-type high-speed mixer, while stirring at a high speed, spray-type adding titanate coupling agent, the amount of coupling agent is 0.5% of the weight of calcium gluconate, and the high-speed mixer The interlayer is fed w...

Embodiment 1

[0037] A halogen-free and phosphorus-free flame-retardant thermoplastic alloy, the composition and ratio of which are calculated by weight: 60 parts of polyethylene, 35 parts of ethylene-vinyl acetate copolymer, 5 parts of maleic anhydride grafted polyethylene, calcium gluconate 30 parts, 10 parts of melamine cyanuric acid, 5 parts of hydrotalcite, 3 parts of zinc stannate, 0.3 parts of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, silicone 3 parts lubricant.

[0038] By adding the above components and proportioning according to the above ratio, the material can prolong the service life and improve the flame retardancy, while ensuring good mechanical properties and processing properties. By adding calcium gluconate to make thermoplastic alloys, calcium gluconate After burning, calcium carbonate and carbon dioxide will be produced. Under the action of carbon dioxide, calcium carbonate will expand rapidly to form porous calcium carbonate, whic...

Embodiment 2

[0048] The method of this embodiment is roughly the same as that of Example 1, except that the alloy components and proportions of this embodiment are different. The specific components and proportions are: 50 parts of polypropylene, 40 parts of styrene-based thermoplastic elastomer, polyethylene 10 parts of grafted styrene, 45 parts of calcium gluconate, 15 parts of melamine cyanuric acid, 5 parts of hydrotalcite, 3 parts of zinc stannate, tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) 0.3 parts of propionic acid] pentaerythritol ester, 5 parts of silicone lubricants.

[0049] Performance tests were performed on the halogen-free and phosphorus-free flame-retardant thermoplastic alloys, and the results are shown in Table 2:

[0050] Test items unit Example 2 Tensile Strength MPa 15.5 elongation at break ％ 300 130℃×1h thermal shock resistance - no cracking 3mm vertical burn - FV-1 Onset decomposition temperature ℃ 438

[0...

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Abstract

The invention discloses a halogen-free phosphorus-free flame-retardant thermoplastic alloy and a preparation method thereof. The halogen-free phosphorus-free flame-retardant thermoplastic alloy is prepared from the following components in parts by weight: 50 to 70 parts of polyolefin, 25 to 40 parts of a thermoplastic elastomer, 5 to 10 parts of a compatilizer, 30 to 50 parts of calcium gluconate,10 to 15 parts of melamine cyanuric acid, 5 to 10 parts of hydrotalcite, 3 to 5 parts of zinc stannate, 0.1 to 0.5 part of an antioxidant and 3 to 5 parts of a silicone lubricant. According to the invention, the thermoplastic alloy is prepared by adding calcium gluconate; after combustion of calcium gluconate, calcium carbonate and carbon dioxide are produced, calcium carbonate can rapidly expandto form porous calcium carbonate under the action of carbon dioxide, the good flame-retardant synergistic effect is achieved, the high mechanical property and the high flame-retardant effect of the thermoplastic alloy are ensured, meanwhile, the smoke generation amount can be reduced, emission of toxic substances is effectively reduced, the environment is protected, and the mechanical property and the chemical property of the alloy are not affected.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a halogen-free and phosphorus-free flame-retardant thermoplastic alloy and a preparation method thereof. Background technique [0002] At present, the most common method to improve the flame retardancy of styrene is to add halogen-containing flame retardants. Halogenated flame retardants have a good cost-effectiveness balance and are widely applicable. However, due to the large amount of smoke generated, the released gas is highly corrosive, and brominated flame retardants decompose into polybrominated dibenzos under certain conditions. Dioxane (PBDD) and polybrominated dibenzofuran (PBDF) substances, which have strong carcinogenic effects. For this reason, traditional halogen-containing flame retardants are facing enormous environmental pressure, and non-halogenation has become the main trend in the development and application of flame retardants. [0003] Low-smoke ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08L23/12C08L51/06C08L53/02C08K13/02C08K5/098C08K5/3492C08K3/22C08K3/24C08K5/134
CPCC08L23/06C08L23/12C08L2205/035C08L2201/02C08L2201/22C08L2201/08C08L2207/04C08L23/0853C08L51/06C08K13/02C08K5/098C08K5/34928C08K3/22C08K3/24C08K5/1345C08L53/02
Inventor 王成陈静王宏杰
Owner FAR EAST CABLE
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