Low-temperature polyvinylidene fluoride heat-shrinkable sleeve and preparation method thereof

A technology of vinylidene fluoride and heat-shrinkable sleeve, which is applied in the field of low-temperature polyvinylidene fluoride heat-shrinkable sleeve and its preparation, can solve the problems of high shrinkage temperature and long shrinkage time, and achieve low shrinkage temperature, short shrinkage time, Good corrosion resistance to chemical media

Inactive Publication Date: 2019-05-21
CHANGYUAN ELECTRONICS DONGGUAN +3
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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 overcome the problems of high shrinkage temperature and long shrinkage time of existing PVDF heat-shrinkable tubes, to provide a low-temperature shrinkable PVDF heat-shrinkable sleeve resistant to special environments and its preparation method

Method used

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  • Low-temperature polyvinylidene fluoride heat-shrinkable sleeve and preparation method thereof
  • Low-temperature polyvinylidene fluoride heat-shrinkable sleeve and preparation method thereof
  • Low-temperature polyvinylidene fluoride heat-shrinkable sleeve and preparation method thereof

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preparation example Construction

[0033] The present invention also proposes a method for preparing the low-temperature vinylidene fluoride heat-shrinkable sleeve, which includes the following steps:

[0034] Step 1: Weigh basic resin 1, 30-50 parts by weight; basic resin 2, 30-50 parts; fluororubber elastomer, 15-30 parts; auxiliary crosslinking agent, 2-5 parts; rheological agent, 3 -8 parts; 0.5-2 parts of antioxidant; 0.5-2 parts of acid absorbing agent; 5-20 parts of color masterbatch; evenly stirred by high-speed mixer;

[0035] Step 2: Granulate through parallel twin-screw extruder, add five-layer filter screen in the die area of ​​twin-screw, and include large-mesh filter screen; then extrude into pipe extrusion with single-screw extruder, add five-layer filter screen Filter, including large-mesh filter, the extrusion temperature is set at 180-200°C in zone 1, 230-250°C in zone 2, and 230-260°C in zone 3;

[0036] Step 3: Treat the outer surface of the extruded pipe with infrared light with a waveleng...

preparation Embodiment 1

[0039] The various components were weighed according to the weights listed in the table below.

[0040]

[0041]

[0042] Stir evenly with a high-speed mixer.

[0043] After granulation by parallel twin-screw extruder, add five-layer filter screen in the die area of ​​twin-screw, including large-mesh filter screen; then extrude into pipe with single-screw extruder, add five-layer filter screen, It also includes a large-mesh filter, and the extrusion temperature is set at 180-200°C in zone 1, 230-250°C in zone 2, and 230-260°C in zone 3.

[0044] The outer surface of the extruded pipe is treated with infrared light with a wavelength of 700-1600nm at a distance of 5-10cm from the die mouth of the extruder.

[0045] The tube is cross-linked by cobalt 60 or electron accelerator 50KGy radiation, and the tube after radiation cross-linking is expanded by 2 to 4 times at a temperature of 180°C to obtain a low-temperature PVDF heat-shrinkable tube, and its properties are as foll...

preparation Embodiment 2

[0054] The various components were weighed according to the weights listed in the table below.

[0055]

[0056] Stir evenly with a high-speed mixer.

[0057] After granulation by parallel twin-screw extruder, add five-layer filter screen in the die area of ​​twin-screw, including large-mesh filter screen; then extrude into pipe with single-screw extruder, add five-layer filter screen, It also includes a large-mesh filter, and the extrusion temperature is set at 180-200°C in zone 1, 230-250°C in zone 2, and 230-260°C in zone 3.

[0058] The outer surface of the extruded pipe is treated with infrared light with a wavelength of 700-1600nm at a distance of 5-10cm from the die mouth of the extruder.

[0059] The tube is cross-linked by cobalt 60 or electron accelerator 50KGy radiation, and the tube after radiation cross-linking is expanded by 2 to 4 times at a temperature of 180°C to obtain a low-temperature PVDF heat-shrinkable tube, and its properties are as follows.

[006...

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Abstract

A low-temperature polyvinylidene fluoride heat-shrinkable sleeve comprises the following components in parts by weight: 20-80 parts of base resin 1, 20-80 parts of base resin 2,15-30 parts of an fluororubber elastomer, 2-5 parts of a co-crosslinking agent, 3-8 parts of a rheological agent, 0.5-2 parts of an acid-absorbing agent and 5-20 parts of color masterbatch, wherein the base resin 1 is one or a mixture of two of the following substances: a 1,1-difluoroethylene homopolymer and a 1,1-difluoroethylene-hexafluoropropylene copolymer; the base resin 2 is one or a mixture of two or more of thefollowing substances: a vinylidenefluoride and chlorotrifluoroethylene copolymer, a vinylidene fluoride and hexafluoropropylene copolymer and a tetrafluoroethylene, vinylidene fluoride and hexafluoropropylene terpolymer. The low-temperature PVDF heat-shrinkable sleeve has high heat resistance, corrosion resistance, mechanical damage resistance and chemical medium corrosion resistance, is applicable to adverse environments having corrosive gas, heat engine cycle and cargo mechanical stress, and has the characteristics of low shrinkage temperature, high shrinkage speed and the like.

Description

technical field [0001] The invention relates to a low-temperature polyvinylidene fluoride (PVDF) heat-shrinkable sleeve and a preparation method thereof. Background technique [0002] Existing heat-shrinkable tubes require high oil resistance and solvent resistance in various industries, but most companies have put forward new requirements for fluoroplastic heat-shrinkable tubes currently on the market in order to shorten the working time and improve production efficiency. PVDF heat-shrinkable tubing that needs low-temperature shrinkage and shortens the shrinkage time. [0003] The chemical structure of the existing fluoroplastic heat-shrinkable tubes is combined with fluorine-carbon bonds. This short-bond structure forms the most stable and firm combination with hydrogen ions, which not only has strong wear resistance and impact resistance , and has high anti-fading and anti-ultraviolet properties in extremely harsh and harsh environments, and the glass softening point is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/14C08L27/16
Inventor 刘成其刘军杨博谢世平
Owner CHANGYUAN ELECTRONICS DONGGUAN
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