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A kind of halogen-free flame-retardant thermoplastic polyurethane elastomer and preparation method thereof

A thermoplastic polyurethane and elastomer technology, applied in the field of polyurethane elastomers, can solve the problems of flame retardancy, mechanical properties and processing properties, etc., and achieve the effect of maintaining good mechanical properties and easy extrusion processing

Active Publication Date: 2021-09-17
浙江益弹新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a halogen-free flame-retardant thermoplastic polyurethane elastomer and its preparation method. The purpose is to solve the technical problem that flame-retardant thermoplastic polyurethane Long-chain alkylbenzimidazoles and layered silicate fillers are blended into thermoplastic polyurethane polymers to improve flame retardancy, delay the slippage of molecular chains of the TPU melt in the state of heating and the arrangement and crystallization of TPU melts in the state of cooling, thereby The melt strength of the material is improved, and the extrusion processing window is widened; and in the prepared halogen-free flame-retardant thermoplastic polyurethane elastomer, no components are precipitated to the surface of the product, the appearance of the product is not affected, and various properties remain good; Screw extruder extrusion method, the process is simple

Method used

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  • A kind of halogen-free flame-retardant thermoplastic polyurethane elastomer and preparation method thereof
  • A kind of halogen-free flame-retardant thermoplastic polyurethane elastomer and preparation method thereof
  • A kind of halogen-free flame-retardant thermoplastic polyurethane elastomer and preparation method thereof

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preparation example Construction

[0066] A method for preparing a halogen-free flame-retardant thermoplastic polyurethane elastomer. The thermoplastic polyurethane polymer, long-chain alkyl benzimidazole and inorganic filler are used as main raw materials, mixed and extruded through a twin-screw extruder. The raw materials may also include antioxidants and lubricants; wherein, the extrusion temperature of the twin-screw extruder is 150-220° C., and the screw speed is 150-300 r / min.

[0067] Raw material preparation:

[0068] Thermoplastic polyurethane polymer (TPU): ES85 (polyester TPU with a shore hardness of 85A), 1185 (polyether TPU with a shore hardness of 85A), all purchased from BASF, Germany;

[0069] Long-chain alkyl benzimidazole: 2-tridecyl benzimidazole, prepared according to the method in the literature [Zhang Jingming et al., Guizhou Chemical Industry, 2009, 34(5): 11]; the structural formula is:

[0070]

[0071] Among them, n=12;

[0072] Substance B: Resorcinol bis(diphenyl)diphosphate (RD...

Embodiment 1

[0088] A preparation method of a halogen-free flame retardant thermoplastic polyurethane elastomer is as follows: in parts by weight, 100 parts of ES85, 15 parts of alkyl benzimidazole (ie 2-tridecyl benzimidazole), 5 parts of layered Silicate filler A, 0.2 part of antioxidant 1010, 0.4 part of antioxidant 626 and 0.2 part of lubricant WAX C were mixed uniformly and added to a heated twin-screw extruder (model CTE50, purchased from Coperion (Nanjing) Machinery) Co., Ltd.); the temperature of each section of the screw extruder is 180°C, 220°C, 220°C, 220°C, 220°C, 210°C, 210°C, 200°C, 180°C, the head temperature is 180°C, and the screw speed is set is 200r / min;

[0089] The performance test of the prepared halogen-free flame retardant thermoplastic polyurethane elastomer is shown in Table 1.

Embodiment 2

[0105] A preparation method of a halogen-free flame retardant thermoplastic polyurethane elastomer is as follows: in parts by weight, each component is added according to the addition amount in Table 2, after mixing uniformly, adding a heated twin-screw extruder (same as Example 1) ;The temperature of each section of the screw extruder is 180°C, 200°C, 200°C, 200°C, 200°C, 195°C, 195°C, 185°C, 185°C, the head temperature is 185°C, and the screw speed is set to 160r / min.

[0106] The performance test of the prepared halogen-free flame retardant thermoplastic polyurethane elastomer is shown in Table 3.

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Abstract

A halogen-free flame-retardant thermoplastic polyurethane elastomer and a preparation method thereof according to the present invention, the thermoplastic polyurethane elastomer composition is mainly composed of 100 parts of thermoplastic polyurethane polymer, 10-30 parts of long-chain alkylbenzimidazole and 2 to 10 parts of layered silicate fillers; wherein, the structural formula of long-chain alkylbenzimidazole is: wherein, n=12; the preparation method of the present invention is: thermoplastic polyurethane polymer, long-chain alkylbenzene And imidazole and layered silicate filler are used as main raw materials, mixed and extruded through a twin-screw extruder; wherein, the extrusion temperature of the twin-screw extruder is 150-220°C, and the screw speed is 150-300r / min. The method of the invention is simple, the tensile strength of the prepared halogen-free flame-retardant thermoplastic polyurethane elastomer is 30-45Mpa, the flame-retardant grade is V0, and the extrusion processing window width is ≥±20°C.

Description

technical field [0001] The invention belongs to the technical field of polyurethane elastomers, and relates to a halogen-free flame-retardant thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] Thermoplastic Polyurethane Elastomer (TPU) is a polymer synthetic material composed of flexible segments and rigid segments, which has rubber elasticity at low temperature and can be plasticized when the temperature is raised. TPU has high mechanical strength, excellent wear resistance and good processability, and is widely used in various cable jackets. However, TPU is extremely flammable and poses a great fire safety hazard when applied to cable sheathing, so it needs to be flame-retardant modified to meet application requirements. [0003] Halogen-containing flame retardants have low cost and high flame retardant efficiency, and are widely used in the preparation of flame-retardant TPU. However, due to the continuous improvement of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/06C08L75/08C08L91/06C08K5/3447C08K3/34C08K13/02
CPCC08K3/34C08K3/346C08K5/3447C08L75/06C08L75/08C08L2201/02C08L2201/22C08L2207/04C08L91/06C08K13/02
Inventor 管祎嗣
Owner 浙江益弹新材料科技有限公司
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