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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 incompatibility of flame retardant properties, mechanical properties and processing properties, and achieve the effects of maintaining good mechanical properties, delaying slippage and improving melt strength.

Active Publication Date: 2020-06-09
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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  • Halogen-free flame-retardant thermoplastic polyurethane elastomer and preparation method thereof
  • Halogen-free flame-retardant thermoplastic polyurethane elastomer and preparation method thereof
  • Halogen-free flame-retardant thermoplastic polyurethane elastomer and preparation method thereof

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preparation example Construction

[0066] The invention relates to a preparation method of a halogen-free flame-retardant thermoplastic polyurethane elastomer. The thermoplastic polyurethane polymer, long-chain alkylbenzimidazole 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 Shore hardness of 85A), 1185 (polyether TPU with Shore hardness of 85A), all purchased from BASF, Germany;

[0069] Long-chain alkylbenzimidazole: 2-tridecylbenzimidazole, 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] where n=12;

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

Embodiment 1

[0088] A preparation method of a halogen-free flame-retardant thermoplastic polyurethane elastomer is: in parts by weight, 100 parts of ES85, 15 parts of alkylbenzimidazole (i.e. 2-tridecylbenzimidazole), 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 are mixed evenly and then 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 setting 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: in parts by weight, each component is mixed according to the addition amount in Table 2, and then added to 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

The invention provides a halogen-free flame-retardant thermoplastic polyurethane elastomer and a preparation method thereof. The thermoplastic polyurethane elastomer is mainly composed of the following components in parts by weight: 100 parts of a thermoplastic polyurethane polymer, 10-30 parts of long-chain alkyl benzimidazole and 2-10 parts of a layered silicate filler, wherein the structural formula of the long-chain alkyl benzimidazole is as shown in the specification, and n in the structural formula is equal to 12. The preparation method comprises the following steps: with the thermoplastic polyurethane polymer, the long-chain alkyl benzimidazole and the layered silicate filler as main raw materials, carrying out mixing and then performing extruding with a double-screw extruder, wherein the extrusion temperature of the double-screw extruder is 150-220 DEG C, and the screw speed of the double-screw extruder is 150-300r / min. The method disclosed by the invention is simple; and the prepared halogen-free flame-retardant thermoplastic polyurethane elastomer has tensile strength of 30-45 Mpa, a flame-retardant grade of V0, and an extrusion processing window of greater than or equalto + / - 20 DEG 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 kind of polymer synthetic material composed of flexible segment and rigid segment, which has rubber elasticity at low temperature and can be plasticized at elevated temperature. TPU has high mechanical strength, excellent wear resistance and good processability, and is widely used in various cable sheaths. However, TPU is extremely flammable and has a great fire safety hazard when applied to cable sheathing, so it needs to be flame-retardant modified to meet application requirements. [0003] Halogenated flame retardants are low in cost and high in flame retardant efficiency, and are widely used in the preparation of flame retardant TPU. However, due to the continuous improvement of envir...

Claims

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Application Information

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Patent Type & Authority Applications(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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