TPU material with flame retardant property meeting vertical combustion level V0 and preparation method thereof

Abstract

The invention provides a TPU material with a flame retardant property meeting a vertical combustion level V0 and a preparation method thereof. The TPU material comprises the components in parts by weight: 100 parts of thermoplastic polyurethane, 35 to 65 parts of a phosphorus-nitrogen flame-retardant system, 2 to 10 parts of a char forming agent and 3 to 15 parts of a flame retardant assistant through mixing. The phosphorus-nitrogen flame-retardant system is applied to the thermoplastic polyurethane, simultaneously, the matching relation among the components is changed, the TPU material with excellent flame retardant property can be obtained, the vertical combustion level of the TPU material reaches the level V0, the oxygen index of the TPU material reaches 39%, the mechanical property ofthe TPU material does not change basically, and the TPU material can meet the requirements of usage occasions of most of TPU materials on the flame retardant property.

Description

technical field [0001] The invention belongs to the field of flame-retardant materials, and in particular relates to a TPU material whose flame-retardant performance reaches the V0 level of vertical combustion and a preparation method thereof. Background technique [0002] Polyurethane, especially thermoplastic polyurethane (TPU) material has a wide range of uses in many fields, however, it has a very fatal weakness that is flammable and not easy to self-extinguish, the molecular structure of TPU material contains a large number of flammable hydrocarbon chain segments, It has low density, large specific surface area, and low thermal conductivity. TPU materials without flame-retardant treatment are common combustibles. It is difficult, especially during the combustion process, expansion openings will occur, the opening rate is relatively high, and there are many combustible components. put out, which seriously limits its widespread use. [0003] With the rapid development o...

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Problems solved by technology

[0004] At present, the flame retardants and flame retardant synergists that can be used for TPU materials are usually mainly organic compounds containing elements such as phosphorus, chlorine, and bromine. For example, a ceramizable flame-retardant polymer composite material is disclosed in CN104650441A , including 30-40 parts by weight of thermoplastic polyurethane elastomer, 25-45 parts by weight of ceramic filler, 20-30 parts by weight of halogen-free flame retardant, 1-5 parts by weight of synergistic flame retardant, 1-3 parts by weight With the plasticizer in parts by weight, the antioxidant in 0.5-2 parts by weight and the crosslinking agent in 0.02-0.15 parts by weight, the performance index of the vertical combustion test can reach V0 level, and the limiting oxygen index can reach 28%; disclosed in CN104693782A A halogen-free flame-retardant polyether-type thermoplastic polyurethane elastomer is developed, and its raw material components include 100 parts of polyether-type thermoplastic polyurethane elastomer resin, 30-50 parts by weight of phosphorus-nitrogen flame-retardant system, 1-5 parts by weight of Flame retardant synergist, 0.5-2 parts by weight of antioxidant, 0.5-2 parts by weight of surface modifier, 0.5-2 parts by weight of coupling agent and 0.5-4 parts by weight of lubricant, the resulting free Considering that the flame retardant TPU material also has a good flame retardant effect, the UL-94 test can reach the V0 level, and the limiting oxygen index can reach more than 33%. However, the flame retardant effect of the above-mentioned organic flame retardant system when used in TPU materials still needs Further improvement, after it is blended with polyurethane materials, the mechanical properties of polyurethane materials such as toughness and modulus are greatly reduced, and the compatibility after blending with polyurethane materials is also poor, and it can be made uniform by processing It is difficult to disperse in polyurethane materials, and its price is relatively expensive, which also limits its application

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