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Method for preparing composite heat shrinkable sleeve with small shrinkage temperature range

A technology of heat-shrinkable sleeve and shrinkage temperature, which is applied in the direction of coating, etc., can solve the problem of insufficient high-voltage resistance performance of double-layer heat-shrinkable sleeves, insufficient high-voltage resistance of heat-shrinkable sleeves, and identification information on the surface of heat-shrinkable sleeves Damage and other problems, to achieve the effect of narrowing the shrinkage temperature range, delaying environmental aging, and avoiding high voltage breakdown

Inactive Publication Date: 2019-09-13
张宏春
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Heat-shrinkable sleeve Heat-shrinkable sleeve, also known as heat-shrinkable protective sleeve, provides insulation protection for wires, cables and wire terminals. There are single-layer and double-layer types. It is widely used in the insulation protection of various wiring harnesses, solder joints, inductance, and the rust and corrosion protection of metal pipes and rods; as the external insulation coating of components, it can play a significant role in protecting electronic components. The information of the electronic components is marked on the surface of the heat-shrinkable sleeve for easy identification, which has high practicability; however, the existing heat-shrinkable sleeves are relatively flexible, but the high-voltage resistance of the heat-shrinkable sleeves is insufficient. When used in a voltage environment, aging phenomena such as cracking are prone to occur, and the heat-shrinkable sleeves currently available on the market generally have an initial shrinkage temperature of about 70°C and a complete shrinkage temperature of about 130°C. The shrinkage temperature range is large, and the temperature range The gradual increase is accompanied by the extension of the heating time. Long-term heating will damage the marking information on the surface of the heat shrinkable sleeve, which will reduce the marking effect. At the same time, it will also cause damage to the protected components, and the protection effect will also be affected. effect, thereby reducing the usefulness of the heat shrinkable sleeve
[0003] The existing patent document CN101989476A discloses a silicone grease coating process for a heat-shrinkable sleeve. The patent document discloses that a silicone grease layer is coated on the inner wall of the heat-shrinkable sleeve. Although it can be formed once, the prepared double-layer heat-shrinkable The high voltage resistance of the sleeve is insufficient, and it needs to be heated for a long time during heat shrinkage, which will have adverse effects on the heat shrinkable sleeve and the covered components

Method used

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  • Method for preparing composite heat shrinkable sleeve with small shrinkage temperature range
  • Method for preparing composite heat shrinkable sleeve with small shrinkage temperature range

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing a composite heat-shrinkable sleeve with a shrinkage temperature in a small range, comprising the following steps:

[0022] (1) Modification of the main material: put polyethylene terephthalate in the reaction kettle, slowly heat until it is completely melted, the heating rate is 2°C / min, keep it warm for 15 minutes, add stearic acid into the reaction kettle, The addition amount is 3.4% of polyethylene terephthalate weight, with 400r / min insulation stirring 40min, can promote both fully mix and graft, improve the modification effect of polyethylene terephthalate, make The stability of polyethylene terephthalate is further enhanced, avoiding high voltage breakdown, prolonging the service life of heat shrinkable sleeves in extreme environments, and obtaining modified polyethylene terephthalate;

[0023] (2) Colloid mixing: Add perfluoroether rubber and tributyl citrate to the modified polyethylene terephthalate, the amount of perfluoroether rubber ad...

Embodiment 2

[0029] A method for preparing a composite heat-shrinkable sleeve with a shrinkage temperature in a small range, comprising the following steps:

[0030] (1) Modification of the main material: put polyethylene terephthalate in the reaction kettle, slowly heat until it is completely melted, the heating rate is 2.5°C / min, keep it warm for 18 minutes, add stearic acid into the reaction kettle, Addition amount is 3.5% of polyethylene terephthalate weight, with 450r / min insulation stirring 45min, can promote both fully mix and graft, improve the modification effect of polyethylene terephthalate, make The stability of polyethylene terephthalate is further enhanced, avoiding high voltage breakdown, prolonging the service life of heat shrinkable sleeves in extreme environments, and obtaining modified polyethylene terephthalate;

[0031](2) Colloid mixing: Add perfluoroether rubber and tributyl citrate to the modified polyethylene terephthalate, the amount of perfluoroether rubber added...

Embodiment 3

[0037] A method for preparing a composite heat-shrinkable sleeve with a shrinkage temperature in a small range, comprising the following steps:

[0038] (1) Modification of the main material: put polyethylene terephthalate in the reaction kettle, slowly heat until completely melted, the heating rate is 3°C / min, keep warm for 20min, add stearic acid into the reaction kettle, The addition amount is 3.6% of polyethylene terephthalate weight, with 500r / min heat preservation and stirring 50min, can promote both fully mixing and grafting, improve the modification effect of polyethylene terephthalate, make The stability of polyethylene terephthalate is further enhanced, avoiding high voltage breakdown, prolonging the service life of heat shrinkable sleeves in extreme environments, and obtaining modified polyethylene terephthalate;

[0039] (2) Colloid mixing: Add perfluoroether rubber and tributyl citrate to the modified polyethylene terephthalate, the amount of perfluoroether rubber...

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Abstract

The invention mainly relates to the technical field of heat shrinkable sleeve processing, and discloses a method for preparing a composite heat shrinkable sleeve with a small shrinkage temperature range. The method comprises the following steps: (1) modification of a main material; (2) rubber matrix mixing; (3) addition of an additive; (4) vulcanization molding; and (5) coating of an outer wall. According to the method for preparing the composite heat shrinkable sleeve with the small shrinkage temperature range in the invention, no toxic and harmful components are generated during the preparation process, and harm to the environment is avoided; and the prepared composite heat shrinkable sleeve has high strength, strong flexibility, good resistance to high voltage and the small shrinkage temperature range, can avoid damage to the heat shrinkable sleeve and a coated component, and is improved in protection and identification effect.

Description

technical field [0001] The invention mainly relates to the technical field of processing heat-shrinkable sleeves, in particular to a method for preparing a composite heat-shrinkable sleeve with a shrinkage temperature in a small range. Background technique [0002] Heat-shrinkable sleeve Heat-shrinkable sleeve, also known as heat-shrinkable protective sleeve, provides insulation protection for wires, cables and wire terminals. There are single-layer and double-layer types. It is widely used in the insulation protection of various wiring harnesses, solder joints, inductance, and the rust and corrosion protection of metal pipes and rods; as the external insulation coating of components, it can play a significant role in protecting electronic components. The information of the electronic components is marked on the surface of the heat-shrinkable sleeve for easy identification, which has high practicability; however, the existing heat-shrinkable sleeves are relatively flexible, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L71/00C08K5/09C08K5/11C08K5/375C08K5/098C08K5/00C08J7/04
CPCC08L67/02C08L71/00C08K5/09C08K5/11C08K5/375C08K5/098C08K5/00C08L2201/08C08L2203/18C08J2367/02C08J2467/04C08J7/0427
Inventor 张宏春
Owner 张宏春
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