Halogen-free flame-retardant adhesion-proof heat-shrinkable bush and preparation method thereof

A heat-shrinkable sleeve and anti-sticking technology, which is applied in the field of halogen-free flame retardant and anti-sticking heat-shrinkable sleeve and its preparation, can solve the problems of short service life and poor flame retardant performance of the heat-shrinkable sleeve, and achieves high resistance to The effect of good dripping performance, good anti-sticking performance and low smoke emission

Inactive Publication Date: 2017-04-26
CHANGYUAN ELECTRONICS DONGGUAN +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problems of poor flame retardancy, short service life and heat shrinkage sticky mold of the existing heat-shrinkable sleeves used in locomo...

Method used

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  • Halogen-free flame-retardant adhesion-proof heat-shrinkable bush and preparation method thereof
  • Halogen-free flame-retardant adhesion-proof heat-shrinkable bush and preparation method thereof
  • Halogen-free flame-retardant adhesion-proof heat-shrinkable bush and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0040] The preparation method of the above-mentioned halogen-free flame-retardant anti-sticking heat-shrinkable sleeve includes the following steps:

[0041] Step 1: Take vinyl polymer by weight, 100 parts; red phosphorus, 20-40 parts; flame retardant, 50-80 parts; antioxidant, 0.5-3 parts; lubricant, 0.5-3 parts; Masterbatch, 5~8 parts;

[0042] Step 2: After mixing and granulating with an internal mixer or a parallel twin-screw extruder, extrude into a pipe with a single-screw extruder;

[0043] Step 3: The pipe is cross-linked by cobalt 60 or electron accelerator 50-160KGy radiation, and the pipe after radiation cross-linking is expanded 2-4 times at a temperature of 85-135°C.

preparation Embodiment 1

[0045] Weigh each according to the weight listed in the table below.

[0046]

[0047] The above-mentioned materials are mixed and granulated by an internal mixer, and then extruded into pipes by a single-screw extruder.

[0048] The pipe is cross-linked by cobalt 60 radiation at 50KGy, and the cross-linked pipe expands 2.5 times at a temperature of 135°C to obtain a halogen-free flame-retardant anti-sticking heat-shrinkable sleeve, and its properties are as follows.

[0049] Flame retardancy: passed the vw-1 flame retardancy test.

[0050] The tensile strength is 13.7MPa, and the elongation at break is 440.32%.

[0051] Halogen-free flame-retardant anti-adhesive heat-shrinkable sleeves for automotive steel pipes are limited and side-by-side. After shrinking and cooling to room temperature, they are separated by two opposite forces. The surface of the heat-shrinkable sleeve has no indentation, no deformation, and no stickiness.

[0052] After aging at 158℃ / 300h, the ten...

preparation Embodiment 2

[0055]

[0056] The above-mentioned materials are mixed and granulated by an internal mixer, and then extruded into pipes by a single-screw extruder.

[0057] The pipe is cross-linked by cobalt 60 radiation at 50KGy, and the cross-linked pipe expands 2.5 times at a temperature of 135°C to obtain a halogen-free flame-retardant anti-sticking heat-shrinkable sleeve, and its properties are as follows.

[0058] Flame retardancy: passed the vw-1 flame retardancy test.

[0059] The tensile strength is 16.83MPa, and the elongation at break is 471.50%.

[0060] Halogen-free flame-retardant anti-adhesive heat-shrinkable sleeves for automotive steel pipes are limited and side-by-side. After shrinking and cooling to room temperature, they are separated by two opposite forces. The surface of the heat-shrinkable sleeve has no indentation, no deformation, and no stickiness.

[0061] After aging at 158℃ / 300h, the tensile strength is 9.43MPa, and the elongation at break is 230.75%.

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Abstract

A halogen-free flame-retardant adhesion-proof heat-shrinkable bush comprises, by weight, 100 parts of a vinyl polymer, 20-40 parts of red phosphorus, 50-80 parts of a fire retardant, 0.5-3 parts of an antioxidant, 0.5-3 parts of a lubricant and 5-8 parts of color master batches. The vinyl polymer is a blend of two or more of the following substances including low-density polyethylene, medium-density polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-methyl acrylate copolymer, an ethylene-butyl acrylate copolymer, an ethylene-octylene copolymer, an ethylene-acrylic ester-maleic anhydride copolymer, methyl vinyl silicone rubber and ethylene propylene rubber. The red phosphorus is microencapsulated red phosphorus. The fire retardant is one or a mixture of more of the following substances including melamine cyanurate, magnesium hydrate, aluminum hydroxide and melamine pyrophosphate. The heat-shrinkable bush is free of halogen, good in flame retardant performance, and capable of passing a vw-1 test and shrinking under a 160 DEG C temperature condition, and does not adhere to a mould after cooling and shaping.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant anti-adhesion heat-shrinkable sleeve and a preparation method thereof, in particular to a heat-shrinkable sleeve for flame-retardant insulation protection of locomotive oil pipes and automobile brake pipes and a preparation method thereof. Background technique [0002] Halogen-free flame-retardant anti-adhesive heat-shrinkable sleeves are widely used in locomotive brake devices, oil passage devices of mechanical equipment, and electrical and electronic products. Material life and so on. [0003] At present, the market products of heat-shrinkable tubes used in locomotive oil pipes and automobile brake pipes are uneven. Most of them are low-end products in China. The products have poor flame retardancy and short service life. After shaping, they stick to each other, and the surface of the pipe is rough, which greatly affects the yield and quality of the product; the flame retardancy and anti-sticki...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L23/16C08L83/07C08K13/06C08K9/10C08K3/02C08K3/22C08K5/3492C08K5/134C08K5/098
CPCC08L23/0853C08L2201/02C08L2201/08C08L2201/22C08L2203/18C08L2205/02C08L2205/035C08L23/0815C08L23/16C08L83/04C08K13/06C08K9/10C08K2003/026C08K2003/2224C08K5/34924C08K5/1345C08K5/098
Inventor 杜杰辉刘军
Owner CHANGYUAN ELECTRONICS DONGGUAN
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