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High-flame-retardance high-heat-resistance halogen-free flame-retardant thermoplastic polyurethane elastomer cable material and preparation method thereof

A thermoplastic polyurethane and elastomer technology, applied in the direction of insulated cables, cables, conductors, etc., can solve the problems of low temperature resistance grade of cable materials, narrow processing temperature range, difficult cable materials, etc., and achieve excellent flame retardant performance and temperature resistance. performance, improved brightness, improved heat resistance

Inactive Publication Date: 2012-12-12
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current technology of halogen-free flame-retardant thermoplastic polyurethane elastomer cable materials has the following difficulties: (1) the processing temperature range is very narrow, it is very sensitive to temperature, and it is difficult to extrude; (2) the heat resistance of TPU material itself is poor, It is very difficult to prepare high heat-resistant cable materials; (3) TPU melts and drips seriously when it is burned, and it is very difficult to achieve a higher level of flame retardancy; (4) The traditional intumescent flame retardant used It is easy to migrate when exposed to water, making the surface of the material very sticky and affecting the feel of the product
(5) The material characteristic of TPU is that the extruded surface is bright, but most customers require the surface of the material to be matte, so it is very difficult for this product to extinction
Chinese Patent Publication No. CN101599314A, an environmentally friendly flame-retardant thermoplastic polyurethane elastomer cable material, using a bromine-containing flame retardant to flame-retardant thermoplastic polyurethane elastomer, is a non-halogen-free cable material, and the prepared cable material has a temperature resistance level Low, only 80°C temperature resistance grade

Method used

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  • High-flame-retardance high-heat-resistance halogen-free flame-retardant thermoplastic polyurethane elastomer cable material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The ratio of the raw material components in the formula is carried out with reference to Example 1 in Table 1.

[0046] The preparation method is as follows: Weigh each component according to the raw material formula, first add styrene-based elastomer (SEEPS) into the mixer, spray plasticizer (industrial white oil), and stir for 30 minutes, then add TPU, new phosphorus nitrogen Add flame retardant, silicon dioxide, siloxane, antioxidants 1010 and 168, and PE color masterbatch into the mixer and stir for 30 minutes, and mix well. Put the mixed raw materials into the twin-screw extruder, the feeding speed is 80rpm / min, the screw speed is 600rpm / min, the length-to-diameter ratio of the screw is 25, and the processing temperature of the twin-screw: the first stage is 180°C, the second The second stage is 190°C, the third stage is 190°C, the fourth stage is 200°C, the fifth stage is 200°C, and the sixth stage is 200°C. After water-cooling and pelletizing, the halogen-free fl...

Embodiment 2

[0050] The ratio of the raw material components in the formula is carried out with reference to Example 2 in Table 1.

[0051] Preparation method and test method are all the same as embodiment 1.

[0052] Compared with Example 1, the content of SEEPS is increased in this example, and the test results are as shown in Table 2, Example 2. The results show that: after the SEEPS content increases, the heat resistance of the prepared cable material improves, and the tensile strength is increased. Lower rate of decline, higher elongation at break, good flame retardancy, can pass the VW-1 vertical burning test, the cable is soft and elastic, the surface is smooth and matte, no flame retardant migration after a period of time, It is suitable for the production of communication cables, marine cables, automotive cables and computer peripheral cables.

Embodiment 3

[0054] The ratio of the raw material components in the formula is carried out with reference to Example 3 in Table 1.

[0055] Preparation method and test method are all the same as embodiment 1.

[0056] Compared with Example 2, in this example, the content of SEEPS is increased to 28%, the content of TPU is reduced to 30%, and the amount of flame retardant is slightly increased. The test results are shown in Example 3 of Table 2. The results show that: SEEPS After the content of SEEPS is increased to 28%, the heat resistance of the prepared cable material is improved more obviously, and the mechanical properties remain basically unchanged, indicating that the increase of SEEPS content has a great effect on the improvement of heat resistance, and the prepared cable material has good flame retardancy , more soft, good hand feeling, oil resistance, wear resistance, smooth surface and matte effect, no flame retardant migration after a period of time, suitable for the production ...

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Abstract

The invention relates to a high-flame-retardance high-heat-resistance halogen-free flame-retardant thermoplastic polyurethane elastomer cable material and a preparation method thereof, belonging to the field of halogen-free flame-retardant cable materials. The cable material is prepared from the following raw materials in percentage by weight: 20-50% of thermoplastic polyurethane elastomer, 15-40% of styrene elastomer, 3-8% of plasticizer, 20-30% of expansion flame retardant, 4-7% of flatting agent, 0.5-1% of lubricant, 0.5-1% of antioxidant and 1.5-3% of master batch. The thermoplastic polyurethane elastomer is a polyether-type thermoplastic polyurethane elastomer of which the hardness range is Shore A 60-90. The invention improves the problem of too narrow processing temperature region for the thermoplastic polyurethane elastomer cable material, and also improves the heat resistance of the cable material. The thermoplastic polyurethane elastomer, which is used as a base, is subjected to melt blending with the high-temperature-resistant material; and the novel expansion flame retardant which is nonmigratory in contact with water is used as the flame retardant of the base.

Description

Technical field: [0001] The invention relates to a halogen-free flame-retardant cable sheathing material and insulation material with thermoplastic polyurethane elastomer as a matrix resin, in particular to a formula of a halogen-free flame-retardant cable material. Background technique: [0002] Wires and cables have been used in the transmission of various electrical energy and signals for many years. Due to their light weight, excellent electrical insulation and easy molding, polymer materials have become the first choice for wire and cable materials. Traditional PVC cable materials, because they contain chlorine elements, have very good flame retardancy and are widely used in wire and cable materials. However, when it burns, it generates a large amount of toxic gas and smoke, which seriously endangers people's lives and property safety. The hydrogen chloride gas released when the PVC cable material is burned can also cause corrosion to the equipment, thereby causing "se...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L53/02C08K13/04C08K7/22C08K3/36C08J3/22H01B7/295
Inventor 李红霞张立群田明王炎祥梁文利胡伟康胡新兵
Owner BEIJING UNIV OF CHEM TECH
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