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A radiation-crosslinked halogen-free flame-retardant polyurethane elastomer and its preparation method

A polyurethane elastomer, cross-linked technology, used in insulators, plastic/resin/wax insulators, electrical components, etc., can solve the problem of tensile strength, tear strength, water resistance can not meet the requirements, heat aging performance is average, TPU problems such as poor flame retardancy, to achieve the effect of increased rigidity, high physical and mechanical properties, and improved stress crack resistance

Active Publication Date: 2020-04-24
ZHEJIANG WANMA MACROMOLECULE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flame retardancy of TPU is poor. Once the burning flame is very large and accompanied by thick black smoke, accompanied by serious droplet phenomenon, there is a risk of expanding the fire. In addition, its thermal aging performance is average.
[0003] At present, the temperature resistance grade of the mature halogen-free flame-retardant thermoplastic polyurethane on the market is 80°C, and the improvement of its tensile strength, tear strength, water resistance, etc. through its physical modification has been unable to meet the requirements.

Method used

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  • A radiation-crosslinked halogen-free flame-retardant polyurethane elastomer and its preparation method
  • A radiation-crosslinked halogen-free flame-retardant polyurethane elastomer and its preparation method
  • A radiation-crosslinked halogen-free flame-retardant polyurethane elastomer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh raw materials according to the following formula in parts by weight: 77 parts of polybutadiene type TPU, 13 parts of melamine urate, 6 parts of aluminum hypophosphite, 3 parts of zinc borate, 1.5 parts of TAIC, 0.2 parts of antioxidant, and 3 parts of other additives parts (1.5:1:0.5 of colorants, lubricants and light stabilizers).

[0038] Put the polybutadiene type TPU into the oven and bake at 95°C for 1.5 hours, then put all the raw materials into the high mixer for stirring, and then carry out basic granulation through the twin-screw extruder, the host of the twin-screw extruder The rotation speed is 250r / min, and the extrusion temperature is 165°C; finally, the finished product (cable sheath) is injected into the finished product (cable sheath) with the granules, and then various performance tests are carried out after irradiation cross-linking with a radiation dose of 15Mard. The results are shown in Table 1 .

Embodiment 2

[0040] Weigh the raw materials according to the following parts by weight formula: 77 parts of polybutadiene type TPU (thermoplastic polyurethane), 13 parts of melamine urate, 6 parts of aluminum hypophosphite, 3 parts of zinc borate, TMPTMA (trimethylolpropane trimethyl Acrylate) 1 part, antioxidant 0.2 part, non-flame retardant additive 3 parts (1.5:1:0.5 colorant, lubricant and light stabilizer).

[0041] Put the polybutadiene type TPU in an oven and bake at 105°C for 1 hour; then mix all the raw materials in a high mixer, and then carry out basic granulation through a twin-screw extruder, the host speed of the twin-screw extruder is 250r / min, and the extrusion temperature is 150°C; finally, the finished product (film) is injected into the finished product (film) with a radiation dose of 10Mard, and various performance tests are carried out after irradiation cross-linking. The results are shown in Table 1.

Embodiment 3

[0043] Raw materials are weighed according to the formula in parts by weight: 67 parts of polybutadiene thermoplastic polyurethane, 10 parts of EVM, 13 parts of melamine urate, 6 parts of aluminum hypophosphite, 3 parts of zinc borate, 1 part of TMPTMA, 0.2 part of antioxidant, 3 parts of non-flame retardant additives (1.5:1:0.5 of colorants, lubricants and light stabilizers).

[0044] Put the TPU in an oven and bake at 90°C for 2 hours; then mix all the raw materials in a high-mixer, and then perform basic granulation through a twin-screw extruder. The main engine speed of the twin-screw extruder is 250r / min. The temperature is 180°C; finally, the finished product (cable sheath) is injected into the finished product (cable sheath), and various performance tests are carried out after cross-linking with a radiation dose of 10Mard. The results are shown in Table 1.

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Abstract

The invention relates to a radiation crosslinking halogen-free flame retardant polyurethane elastomer and a preparation method thereof. The preparation method has the characteristic of being simple in process, and the provided elastomer has excellent technical performance. According to the technical scheme, the radiation crosslinking halogen-free flame retardant polyurethane elastomer comprises the components of thermoplastic polyurethane (TPU) and the like. The preparation method of the radiation crosslinking halogen-free flame retardant polyurethane elastomer is carried out in the following steps of (1) weighing various raw materials; (2) putting the TPU raw material into an oven; (3) putting the dried TPU into a stirrer, and then adding an auxiliary radiation crosslinking material and a sensitizer for stirring; (4) adding other materials to a mixture treated in the step (2), and then stirring and mixing evenly; (5) adding the mixed materials to a twin-screw extruder, extruding and carrying out water cooled pelletizing to obtain the crosslinking halogen-free flame retardant polyurethane elastomer; and (6) forming a finished product and carrying out radiation crosslinking.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic polymer materials, and in particular relates to a radiation-crosslinked halogen-free flame-retardant polyurethane elastomer and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer (TPU) is a material between rubber and plastic. It is composed of diisocyanate molecules such as diphenylmethane diisocyanate (MDI) or toluene diisocyanate (TDI) and macromolecular polyols. A polymer material formed by co-reacting and polymerizing molecular polyols (chain extenders). TPU has been widely used in automobiles, wires and cables, medical and health care, electronic appliances, industry and sports, etc. It has high strength, good toughness, wear resistance, cold resistance, oil resistance, water resistance, etc. that other plastic materials cannot match. It has many excellent functions such as high waterproof and moisture permeability, windproof, cold proof, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/14C08L83/04C08L23/08C08L63/10C08K13/02C08K5/3492C08K3/32C08K3/38H01B3/30
CPCC08K3/32C08K3/38C08K5/34928C08K13/02C08K2003/387C08L75/14C08L2201/02C08L2201/08C08L2201/22C08L2203/202C08L2312/06H01B3/302C08L83/04C08L23/0853C08L63/10
Inventor 黄青松贺锡挺盛逸文高爽李秀娟
Owner ZHEJIANG WANMA MACROMOLECULE MATERIAL
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