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Double-layer cold-shrink bushing, preparation method and application thereof

A cold-shrinkable sleeve and a cold-shrinkable tube technology are applied in the field of double-layer cold-shrinkable sleeves and their preparation, which can solve the problems of poor physical and mechanical properties, poor retraction performance, easy generation of water storage, etc., and achieve good low temperature resistance. , Improve physical and mechanical properties, enhance waterproof sealing effect and life effect

Pending Publication Date: 2021-01-22
SHENZHEN COTRAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The single-layer silicone cold-shrinkable sleeve has obvious advantages in retractability, but because of its poor physical and mechanical properties, tear resistance, wear resistance and puncture resistance performance are very poor, bumps and hail weather appear during the installation process Cracks will occur when impacting, and eventually the product will fail and cannot meet the waterproof and sealing requirements;
[0005] 2. The built-in silicone rubber cold-shrinkable sleeve is a layer of unvulcanized silicone rubber cement built on the basis of a single-layer silicone cold-shrinkable sleeve, which is superior to a single-layer silicone cold-shrinkable sleeve in terms of waterproof and sealing performance. The defect mentioned in the above point 1, and the built-in silica gel is in a non-vulcanized state, and aging phenomena such as cracks will appear over time, which will affect the waterproof and sealing performance of the product;
[0006] 3. Single-layer ethylene-propylene rubber cold-shrinkable tubing has obvious advantages over silicone rubber in terms of wear resistance and puncture resistance, but its retractability is worse than that of silicone cold-shrinkable tubing in high and low temperature environments, and its storage stability is also poor. With the delay of time, the retractability of the ethylene propylene rubber cold shrinkable tube will be lost in the expanded state, which will eventually affect the waterproof and sealing performance of the product;
[0007] 4. A double-layer cold-shrinkable sleeve mentioned in Chinese patent documents CN205791324U and CN104610664A is to expand a section of silicone tube and then expand a layer of ethylene-propylene rubber tube, and the silicone tube and ethylene-propylene rubber tube have a certain pre-set. The double-layer cold-shrinkable tube using this method will have a large difference in retractability between the ethylene-propylene rubber tube and the silicone tube. After installation, there will be an obvious gap between the silicone layer and the ethylene-propylene rubber layer, and the gap The part is prone to water storage, which will eventually affect the waterproof and sealing performance of the product

Method used

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  • Double-layer cold-shrink bushing, preparation method and application thereof

Examples

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preparation example Construction

[0036] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0037] Unless otherwise specified, the experimental methods used in the following examples are conventional methods; the reagents and materials used in the following examples, unless otherwise specified, can be obtained from commercial sources.

[0038]The test method or standard used in the following examples is: the test standard of tensile strength is ASTM D412-15a Method A; the test standard of elongation at break is ASTM D412-15a Method A; the test standard of tear strength is ASTM ...

Embodiment 1

[0040] A: Select a silicone cold shrink tube with an inner diameter of 7mm and a thickness of 2.5mm (expansion ratio is 4.5 times), and apply vinyl silane surface treatment agent evenly on the outer surface of the silicone cold shrink tube, and then treat the outer surface of the silicone cold shrink tube. surface treatment;

[0041] B: Evenly coat the styrene-butadiene rubber adhesive on the outer surface of the silicone cold shrink tube;

[0042] C: Select an ethylene-propylene rubber cold-shrinkable tube with an inner diameter of 8 mm and a thickness of 2.5 mm (expansion ratio is 4.5 times), and expand the ethylene-propylene rubber cold-shrinkable tube to the silicone cold-shrinkable tube prepared in the above step B through an expansion machine to prepare a Double-layer tubing with an adhesive interface layer;

[0043] D: Cut the double-layer tube prepared in the above step C, and cut it according to the required length, and ensure that the length of the silicone cold shr...

Embodiment 2

[0054] A: Select a silicone cold shrink tube with an inner diameter of 9mm and a thickness of 3.0mm (expansion ratio is 4.5 times), and apply vinyl silane surface treatment agent evenly on the outer surface of the silicone cold shrink tube, and then treat the outer surface of the silicone cold shrink tube. surface treatment;

[0055] B: Evenly coat the styrene-butadiene rubber adhesive on the outer surface of the silicone cold shrink tube;

[0056] C: Select an ethylene-propylene rubber cold-shrinkable tube with an inner diameter of 10mm and a thickness of 3.0mm (expansion ratio is 4.5 times), and expand the ethylene-propylene rubber cold-shrinkable tube to the silicone cold-shrinkable tube prepared in the above step B through an expansion machine to prepare a Double-layer tubing with an adhesive interface layer;

[0057] D: Cut the double-layer tube prepared in the above step C, and cut it according to the required length, and ensure that the length of the silicone cold shri...

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Abstract

The invention provides a double-layer cold-shrinking bushing, a preparation method and application thereof. According to the invention, the double-layer cold-shrinking bushing has excellent wear resistance and scratch resistance by utilizing an ethylene propylene rubber cold-shrinking tube; through the matching design of the inner diameter between the ethylene propylene rubber cold-shrinking tubeand the silica gel cold shrink tube, the problem that a gap is formed due to the difference of retractility between the ethylene propylene rubber cold-shrinking tube and the silica gel cold-shrinkingtube is solved; and when the double-layer cold-shrinkingbushing is used, the double-layer cold-shrinkingbushing can be directly installed on a cable connector, a power cable joint or other various cable joints, and installation can be completed by pulling out a supporting pipe, and the double-layer cold-shrinking bushing can provide durable and reliable waterproof sealing for connectors or jointsneeding to be protected in extremely cold, extremely hot, extremely wet, plateau and salt mist environments.

Description

technical field [0001] The invention belongs to the technical field of waterproof sealing, and in particular relates to a double-layer cold-shrinkable sleeve and its preparation method and application. Background technique [0002] At present, the waterproof sealing of communication connectors, power cables and various cable joints in the fields of communication, electric power, rail transit and petrochemical industry mostly adopts the solution of cold shrinkable sleeve. The main materials of cold-shrinkable sleeves on the market are silicone rubber and ethylene-propylene rubber. The structures of cold-shrinkable sleeves prepared for these two materials mainly include single-layer silicone cold-shrinkable sleeves and built-in silicone cement cold-shrinkable sleeves. Tube, single-layer ethylene-propylene rubber cold-shrinkable sleeve, and a kind of ethylene-propylene rubber double-layer cold-shrinkable tube with built-in silicone tube as mentioned in Chinese patent documents ...

Claims

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Application Information

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IPC IPC(8): B32B1/08B32B9/00B32B9/04B32B25/00B32B7/12B32B33/00B32B37/12B32B38/00H02G3/04
CPCB32B1/08B32B9/00B32B9/043B32B25/00B32B9/04B32B7/12B32B33/00B32B37/1284B32B38/00B32B38/0004H02G3/0462B32B2307/554B32B2307/584B32B2307/7265B32B2307/30B32B2307/51B32B2307/558B32B2597/00
Inventor 占成武周东庄泽峰朱栋栋刘永新
Owner SHENZHEN COTRAN NEW MATERIAL CO LTD
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