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Anti-cracking, low-smoke, halogen-free and flame-retardant sheath material and preparation method thereof

A technology of flame retardant sheathing and sheathing material, applied in plastic/resin/wax insulators, organic insulators, etc., can solve problems such as limiting practical application, reducing mechanical properties, sheath cracking, etc., achieving excellent practical performance, reducing internal Stress, high economical effect

Pending Publication Date: 2020-06-12
云南鑫成鹏高分子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the flame retardant and low smoke effects of low-smoke and halogen-free materials, a large amount of halogen-free flame retardants and halogen-free fillers are generally used for filling. Although the overall flame retardant and low-smoke effects can be guaranteed, the filling of a large number of fillers The overall mechanical properties of the material are greatly reduced, and it is easy to cause cracking and damage to the sheath, which greatly limits the practical application of this material. Therefore, it is necessary to study a crack-resistant low-smoke halogen-free flame-retardant sheathing material with high mechanical properties.

Method used

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  • Anti-cracking, low-smoke, halogen-free and flame-retardant sheath material and preparation method thereof
  • Anti-cracking, low-smoke, halogen-free and flame-retardant sheath material and preparation method thereof

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preparation example Construction

[0036] The present invention also provides a preparation method for the above-mentioned sheath material, adopting the formula of the above-mentioned sheath material, mainly comprising the following steps:

[0037] 1) Put the raw materials into the internal mixer according to the proportion and banbury, and banbury at 140-150°C for 15-20min;

[0038] 2) extruding the product obtained in step 1) using an extruder.

[0039] Among them, the banburying process and extrusion process are subject to the actual equipment and products, but it should be ensured that the material is mixed at 140-150°C for no less than 15 minutes, and it should not exceed 20 minutes; in step 2), it is preferable to use two-stage Type extruder extrusion, twin-screw segment extrusion temperature is 100 ~ 165 ℃, single-screw extrusion temperature is 120 ~ 140 ℃.

[0040] The invention provides an anti-cracking low-smoke halogen-free flame-retardant sheathing material and a preparation method thereof. The sheat...

Embodiment 1

[0043] The anti-cracking low-smoke halogen-free flame-retardant sheath material described in this embodiment is calculated in parts by weight, and its raw materials include: 27.5 parts of EVA (FL00328 Exxon Mobil), 7.5 parts of metallocene linear low-density polyethylene (1018LA Exxon Mobil) Sen Mobil), 7.5 parts of compatibilizer, 55 parts of halogen-free flame retardant filler, 5 parts of charring agent, 0.75 part of filler treatment agent, 0.6 part of antioxidant, 0.65 part of lubricant, 0.06 part of crosslinking agent. Wherein, the VA content of the EVA is 27%; the compatibilizer maleic anhydride grafted EVA (9630 DuPont); the halogen-free flame retardant filler is aluminum hydroxide (Hengyi Chemical) and magnesium hydroxide (Heng billion chemical industry) according to the mass ratio of 2:1 composition; the filler treatment agent uses low polyvinyl triethoxysilane (Jessica) with a degree of polymerization of 2 to 3; the antioxidant uses four [ β-(3,5-di-tert-butyl-4-hydro...

Embodiment 2

[0045] The anti-cracking low-smoke halogen-free flame-retardant sheath material described in this embodiment is calculated in parts by weight, and its raw materials include: 30 parts of EVA, 10 parts of metallocene linear low-density polyethylene, 5 parts of compatibilizer, 45 parts of halogen-free Flame retardant filler, 3 parts of char forming agent, 0.5 part of filler treatment agent, 0.2 part of antioxidant, 0.3 part of lubricant and 0.04 part of crosslinking agent. Wherein, the VA content of the EVA is 26-28%; the compatibilizer maleic anhydride grafted polyethylene (1020 ExxonMobil); the halogen-free flame retardant filler is aluminum hydroxide and magnesium hydroxide according to A composition with a mass ratio of 2:1; the filler treatment agent uses low polyvinyl tris (β-methoxyethoxy) silane (Jessica) with a degree of polymerization of 2 to 3; the antioxidant Use β-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate (Shenghong Chemical); the lubricant is a silo...

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Abstract

The invention relates to the technical field of polymer modification, and concretely relates to an anti-cracking, low-smoke, halogen-free and flame-retardant sheath material and a preparation method thereof. According to the sheath material, EVA with VA content of 24-30% and metallocene linear low-density polyethylene are used as matrix resin, the metallocene linear low-density polyethylene is narrow in molecular weight distribution and regular in molecular structure, and a uniform three-dimensional network structure can be formed through crosslinking modification with EVA, so that the internal stress of a molecular structure is reduced, the cracking resistance is enhanced, and the defect of insufficient processability of metallocene linear low-density polyethylene is overcome by virtue ofgood fluidity and processability of EVA. In addition, a maleic anhydride grafted polymer and a silane oligomer filler treating agent are also added to enhance the compatibility between each resin anda halogen-free flame-retardant filler, so that the structural stability of the sheath material is further enhanced, and the anti-cracking performance is improved. The halogen-free and flame-retardantsheath material provided by the invention has good comprehensive performances, and especially has excellent cracking resistance.

Description

technical field [0001] The application relates to the technical field of polymer modification, in particular to an anti-cracking low-smoke halogen-free flame-retardant sheathing material and a preparation method thereof. Background technique [0002] With the rapid development of electric power, electronics and information industries, the consumption of cables as a supporting transmission medium has increased dramatically. Conventional cable sheaths usually use polyvinyl chloride materials. Although polyvinyl chloride materials have excellent performance, good processing performance, and low price, when polyvinyl chloride materials are burned, they will emit thick smoke and contain a lot of hydrogen chloride. Harmful gas, in the event of an accidental fire, these dense smoke containing a large amount of hydrogen chloride poisonous substances have brought great harm to the escapees. With the gradual enhancement of people's awareness of fire protection and safety, people are ...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L51/06C08K13/02C08K3/22C08K5/14C08K5/3492H01B3/44
CPCC08L23/0853H01B3/44C08L2201/02C08L2201/22C08L2201/08C08L2205/02C08L2205/035C08L2203/202C08K2003/2227C08K2003/2224
Inventor 王俊龙张金平石克界
Owner 云南鑫成鹏高分子科技有限公司
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