Non-halogen flame-retardant thermoplastic elastomer composite with SEBS (Styrene-Ethylene/Butylene-Styrene) as base material and preparation method thereof

Abstract

The invention discloses a non-halogen flame-retardant thermoplastic elastomer composite with SEBS (Styrene-Ethylene / Butylene-Styrene) as a base material, comprising the following components in parts by mass: 25-45 parts of SEBS, 15-25 parts of polyester elastomer, 5-15 parts of flame-retardant plasticizer, 5-15 parts of softening plasticizer, 15-25 parts of flame retardant, 3-5 parts of compatibilizer, 0.1-1 parts of antioxidant and 0.5-2 parts of processing aid. A preparation method of the non-halogen flame-retardant thermoplastic elastomer composite with SEBS as the base material comprises the following steps of: (1) mixing all materials in a mixer uniformly; (2) adding the mixture in a double-screw extruder, and melt extruding, stripping, cooling and cutting into granules so as to obtain the finished product. The non-halogen flame-retardant thermoplastic elastomer composite with SEBS as the base material has the advantages of good flame retardant property, good mechanical property, and easiness of manufacturing and molding.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant thermoplastic elastomer compound based on SEBS and a preparation method. Background technique [0002] PVC is a commonly used insulating material for cables. However, PVC has poor thermal stability. Therefore, when the cable is powered on for a long time and exposed to sunlight, the outer layer of PVC insulating material is prone to aging and failure, causing safety hazards. At the same time, PVC insulating material During the long-term heating and aging process, toxic chlorine-containing organic compounds will be released, polluting the environment, and not in line with the concept of sustainable development. [0003] With the increasing awareness of environmental protection, people are constantly looking for other materials. The SEBS-based blend has excellent weather resistance, aging resistance and processing properties. However, SEBS is flammable. Therefore, the SEBS-based resistance Fuel cab...

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Problems solved by technology

[0002]PVC is a commonly used insulating material for cables. However, PVC has poor thermal stability. Therefore, when the cable is energized for a long time and exposed to sunlight, the outer layer of PVC insulation The material is easy to age and fail, causing potential safety hazards. At the same time, PVC insulation materials will release toxic chlorine-containing organic compounds during the long-term electrification and heating aging process, which will pollute the environment and do not conform to the concept of sustainable development.

[0003]With the increasing awareness of environmental protection, people are constantly looking for other materials. The blend based on SEBS has excellent weather resistance, aging resistance and processing properties However, SEBS is flammable. Therefore, flame-retardant cable materials based on SEBS are becoming a research hotspot. In the prior art, flame-retardant cable materials based on SEBS are mainly divided into two categories, (1) SEBS+other thermoplastic Plastic (such as PP) + halogen-free flame retardant + other additives; patents such as CN101955626A, CN1772807A, CN101629007A, and CN101735546A respectively describe thermoplastic elastomers with different proportions of SEBS + PP + different types of halogen-free intumescent flame retardant + additives Compound and its preparation method; (2) SEBS+char forming agent PPO+phosphate ester+flame retardant+other additives; for example, patents US2009 / 0088502A1, US2009 / 00884577A1, CN101824201A, and CN100509938C describe different proportions of SEBS+PPO+phosphate ester + Flame retardant + other additives thermoplastic elastomer compound and its preparation method; (1) Since SEBS and PP itself do not have the function of charring, the addition of flame retardant is too large, resulting in the composite material Performance, appearance and processability are severely reduced. In type (2), due to the introduction of PPO, which has a carbon-forming function during combustion, the flame retardancy and mechanical properties are better, but this kind of blend is difficult to process, and the material is due to Unpleasant odor due to the addition of modified PPO

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