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Cross-linking process of polyethylene-silane

A polyvinyl silane and vinyl silane technology, applied in the field of polyvinyl silane crosslinking, can solve problems such as reaching the processing level of thermoplastic materials

Inactive Publication Date: 2003-02-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both technologies have so far struggled to bring them up to the level of processing thermoplastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Polyethylene 100 parts

[0012] Dicumyl peroxide 0.07 parts

[0013] Vinyltriethoxysilane 1 part

[0014] 0.1 parts of dibutyltin dilaurate

[0015] Zinc stearate 0.01 parts

[0016] Tetrakis[β-(3,5-di-tert-butyl-4-hydroxy-phenyl)propionic acid]pentaerythritol ester 0.05 part

[0017] 0.05 parts of tris(2,4-tert-butylphenyl)phosphite

[0018] The raw materials are blended and extruded on a φ30 single-screw extruder, and the temperature of each section is 150°C, 175°C, 170°C, and 140°C. The product is hydrolyzed and cross-linked at 80°C for 10 hours, and the gel content is 62.8%, the tensile strength is 32.7Mpa, the elongation at break is 670%, and the impact strength is 7.7J / m.

Embodiment 2

[0020] Polyethylene 100 parts

[0021] Dicumyl peroxide 0.07 parts

[0022] Vinyltriethoxysilane 1 part

[0023] 0.1 parts of dibutyltin dilaurate

[0024] Zinc stearate 0.5 parts

[0025] Tetrakis[β-(3,5-di-tert-butyl-4-hydroxy-phenyl)propionic acid]pentaerythritol ester 0.05 part

[0026] 0.05 parts of tris(2,4-tert-butylphenyl)phosphite

[0027] The experimental operation is the same as that of Example 1, the gel content is 68.9%, the tensile strength is 34.8MPa, the elongation is 810%, and the impact strength is 12.7J / m.

Embodiment 3

[0029] Polyethylene 100 parts

[0030] Dicumyl peroxide 0.07 parts

[0031] Vinyltriethoxysilane 1 part

[0032] 0.1 parts of dibutyltin dilaurate

[0033] 1 part zinc stearate

[0034] Tetrakis[β-(3,5-di-tert-butyl-4-hydroxy-phenyl)propionic acid]pentaerythritol ester 0.05 part

[0035] 0.05 parts of tris(2,4-tert-butylphenyl)phosphite

[0036] The experimental operation is the same as that of Example 1, the gel content is 72.5%, the tensile strength is 36MPa, the elongation is 800%, and the impact strength is 15J / m.

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Abstract

A process for preparing cross-linked polyvinyl silane includes mixing polyethylene, diisoproplbenzene peroxide, vinyl triethoxyl silane, zinc stearate, tert [beta-(3,5-di-tert-butyl-4-hydroxyl-phenyl) propanoic] pentaerythritol ester and tri(2,4-tert-butyl phenyl) phosphite, stirring, extruding out, and immersing in water at 80 + / -5 deg. for 9-11 hrs. Its advantages are less consumption of trigger and cross-linking agent (decreased by 50%) and smooth surface of product.

Description

Technical field: [0001] The invention belongs to a method for polyvinyl silane crosslinking. Background technique: [0002] Polyethylene can greatly improve mechanical properties, chemical resistance, aging resistance, wear resistance, and good adhesive properties through cross-linking reactions. Therefore, it is widely used in the fields of pipes and cables. Hydrolysis crosslinking of polyethylene by silane grafting is a technology that appeared in the 1960s (U.S. 3 075948 (1963)), and was developed in the 1970s. Prior to this, the crosslinking reaction of polyethylene was mostly through radiation crosslinking and peroxide crosslinking. Among them, the radiation crosslinking equipment is extremely expensive, and its application is limited, while the peroxide crosslinking process is difficult to control, and the quality of the product is difficult to guarantee. Therefore, as soon as the silane crosslinking technology appeared, it quickly became the main method of polyethy...

Claims

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Application Information

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IPC IPC(8): B29C35/02C08J3/24C08L23/06
Inventor 刘南安黄燕
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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