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Polyvinylidene fluoride heat-shrinkable sleeve and preparation method thereof

A technology of heat-shrinkable sleeve and polyvinylidene fluoride, which is applied in the field of polyvinylidene fluoride heat-shrinkable sleeve and its preparation, can solve the problems of poor mechanical properties, flame retardancy, oil resistance, high temperature resistance and low temperature resistance, etc. Achieve outstanding oil resistance, high temperature resistance and low temperature resistance

Inactive Publication Date: 2017-05-10
CHANGYUAN ELECTRONICS DONGGUAN +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main technical problem to be solved by the present invention is to overcome the defects of existing polyvinylidene fluoride heat-shrinkable sleeves with poor mechanical properties, flame retardancy, oil resistance, high temperature resistance, and low temperature resistance, and provide a method that can fully satisfy Polyvinylidene fluoride heat-shrinkable sleeve required by UL224 and US military standard SAE-AMS-DTL-23053 / 18 and preparation method thereof

Method used

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Experimental program
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Effect test

preparation example Construction

[0035] The preparation method of the polyvinylidene fluoride heat-shrinkable sleeve, it comprises the steps:

[0036] Step 1: Weigh 100 parts of polyvinylidene fluoride resin, 1-8 parts of antioxidant, 0.5-5 parts of light stabilizer, 5-10 parts of acid absorbing agent, 0.5-3 parts of lubricant, and 0-3 parts of colorant 10 copies;

[0037] Step 2: Mix and granulate through parallel twin-screw extruder, and then extrude into pipe with single-screw extruder;

[0038] Step 3: The tube is cross-linked by radiation of 120-250KGy in an electron accelerator, and the tube after radiation cross-linking is expanded 2-4 times at a temperature of 170-210°C.

preparation Embodiment 1

[0040] Take 100 parts by weight of 1,2 difluoroethylene-hexafluoropropylene copolymer; 1 part of antioxidant 4,4'-bis(α,α-dimethylbenzyl)diphenylamine; light stabilizer poly(1- 5 parts of hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxypiperidine) succinate; 5 parts of magnesium oxide; 0.5 parts of acetylurea diol.

[0041] The above materials are mixed and granulated by a parallel twin-screw extruder, and then extruded into a pipe by a single-screw extruder. The pipe is radiated and cross-linked by an electron accelerator at 120KGy, and the cross-linked pipe is expanded at a temperature of 200°C for 4 Times, to obtain polyvinylidene fluoride heat shrinkable sleeve, its performance is as follows:

[0042] Flame retardancy: Pass vw-1 test;

[0043] Mechanical properties, tensile strength: 32.1MPa, elongation at break: 524%;

[0044] High temperature resistance, after aging at 250℃ / 168hrs, tensile strength: 26.4MPa, elongation at break: 356%;

[0045] Low temperature resistance, af...

preparation Embodiment 2

[0048] Take 80 parts by weight of 1,2 difluoroethylene-hexafluoropropylene copolymer; 20 parts of 1,2 difluoroethylene homopolymer; antioxidant 4,4'-bis(α,α-dimethylbenzyl) 8 parts of diphenylamine; 0.5 parts of light stabilizer poly(1-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxypiperidine) succinate; 4 parts of magnesium oxide; 3 parts of calcium oxide ; 3 parts of zinc oxide; 1 part of acetylurea diol; 2 parts of polyglycerin fatty acid ester; 5 parts of coloring agent.

[0049] The above materials are mixed and granulated by a parallel twin-screw extruder, and then extruded into a pipe by a single-screw extruder. Times, to obtain polyvinylidene fluoride heat shrinkable sleeve, its performance is as follows:

[0050] Flame retardancy: Pass vw-1 test;

[0051] Mechanical properties, tensile strength: 40.9MPa, elongation at break: 464%;

[0052] High temperature resistance, after aging at 250℃ / 168hrs, tensile strength: 33.4MPa, elongation at break: 328%;

[0053] Low tempera...

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Abstract

The invention discloses a polyvinylidene fluoride heat-shrinkable sleeve which contains the following components in parts by weight: 100 parts of polyvinylidene fluoride resin, 1-8 parts of antioxidant, 0.5-5 parts of light stabilizer, 5-10 parts of acid absorber, 0.5-3 parts of lubricant and 0-10 parts of coloring agent; the polyvinylidene fluoride resin is one or a mixture of more of the following substances: 1,2-vinyl difluoride homopolymer, 1,2-vinyl difluoride-hexafluoropropylene copolymer and 1,2-vinyl difluoride tetrafluoroethylene copolymer; the antioxidant is 4,4'-bis(alpha, alpha-dimethyl benzyl) diphenylamine; the light stabilizer is poly(1-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxypiperidine) succinate; and the acid absorber is one or a mixture of more of the following substances: magnesium oxide, calcium oxide and zinc oxide. The radiation crosslinked polyvinylidene fluoride heat-shrinkable sleeve disclosed by the invention can completely meet the requirements of UL224 and American military standard SAE-AMS-DTL-23053 / 18 in performance and can be widely applied to the fields such as locomotives, ships, aerospace and military industry.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride heat-shrinkable sleeve and a preparation method thereof, in particular to a polyvinylidene fluoride heat-shrinkable sleeve which can be used in locomotives, ships, aerospace, military and other fields and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride heat-shrinkable sleeves can be widely used in the protection of electronic components in high temperature and oil-resistant environments, as well as the insulation and protection of resistance capacitors and thermocouples, as well as the mechanical protection of various metal wires, as well as the protection of wire ends, connections, and terminals. Insulate, protect and reinforce. [0003] Although fluoroplastic materials have developed a variety of heat shrinkable products, the production technology of these products is only mastered by a few companies such as Europe, America and Japan. The development of domestic f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L79/04C08L71/02C08K5/18C08K3/22C08K5/21C08K13/02B29C61/02
CPCC08L27/16B29C61/025C08L2201/02C08L2201/08C08L2203/20C08L2205/025C08L2205/03C08L2205/035C08L2312/06
Inventor 曾志安鲁雪莲程炎波杜杰辉鲁尔军
Owner CHANGYUAN ELECTRONICS DONGGUAN
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