Halogen-free flame retardant conductive TPU material and preparation technique thereof

Abstract

The invention discloses a halogen-free flame retardant conductive TPU material and a preparation technique thereof. The TPU material is prepared from, by weight, 50-100 parts of thermoplastic polyurethane elastomer, 0.05-4 parts of heat stabilizer, 0-20 parts of assistant conductive agent, 3-50 parts of fire retardant, 0.1-25 parts of alkali metal salt, 0.05-3 parts of lubricant, and 0.05-4 parts of antioxygen. The preparation technique includes steps of weighing thermoplastic polyurethane elastomer, heat stabilizer, assistant conductive agent, fire retardant, alkali metal salt, lubricant, and antioxygen by weight, putting components in a high-speed mixer and mixing for 2-10 minutes; discharging, and then extruding and prilling the mixture by a dual-screw extruder and obtaining the TPU material, wherein the processing temperature of the dual-screw extruder is 140-190 DEG C, and the rotate number of the screw is 20-40 Hz. The prepared TPU material is low-smoke and toxic-free, low in addition, and high in flame retarding efficiency; besides, the TPU material is good in conducting effect, shallow in color, low in cost, good in heat resistance and others; the raw material is low in cost, and the TPU material is convenient to process and can facilitate industrial production.

Description

technical field [0001] The invention relates to the technical field of thermoplastic polyurethane elastomer materials, in particular to a halogen-free flame-retardant conductive TPU material and a preparation process thereof. Background technique [0002] Thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, referred to as TPU, is a (AB) n-type block linear polymer, A is a high molecular weight (1000~6000) polyester or polyether, and B is a polyester or polyether containing 2~12 straight Diols with chain carbon atoms, the chemical structure between AB chain segments is diisocyanate. It consists of a flexible soft segment and a rigid hard segment. TPU with different segment structures have different properties, and the type of segment structure is mainly determined by the type of raw materials. The introduction of side groups in the molecular structure will reduce the orientation crystallinity between macromolecules, resulting in a decrease ...

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Problems solved by technology

The oxygen index of ordinary TPU is only 17.0% to 18.0%, which is a flammable material, and the charring rate is low when burning, and it has a strong droplet phenomenon, which limits its application range.