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Method for producing silane crosslinked polyethylene hot water flexible tubes through one-step process of single screw extruder

A single-screw extruder and silane cross-linking technology, which is applied in the direction of hoses, pipes, mechanical equipment, etc., can solve the problems of high technical requirements, large equipment investment, and limited development, and achieve simple process, high production efficiency, and good quality. The effect of hygienic performance

Active Publication Date: 2013-09-04
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing one-step process has high technical requirements and large investment in equipment, which limits its development.

Method used

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  • Method for producing silane crosslinked polyethylene hot water flexible tubes through one-step process of single screw extruder
  • Method for producing silane crosslinked polyethylene hot water flexible tubes through one-step process of single screw extruder
  • Method for producing silane crosslinked polyethylene hot water flexible tubes through one-step process of single screw extruder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: A cross-linked modified polyethylene hose with an inner diameter of 8 mm and a wall thickness of 1 mm was prepared.

[0021] The present embodiment adopts following raw material formula:

[0022] Polyethylene: 100kg;

[0023] Vinyltrimethoxysilane: 1.5kg;

[0024] Dicumyl peroxide: 0.6kg;

[0025] Dibutyltin dilaurate: 0.15kg;

[0026] Antioxidant 330: 0.2 kg.

[0027] Hoses were prepared from the above formulation compositions as follows:

[0028] 1. Mix the well-proportioned cross-linked polyethylene composition evenly.

[0029] 2. Add the mixed composition into the single-screw reaction extruder at one time, and control the temperature of each section of the extruder. The feeding section of the first zone is 165°C (the feeding port has a cooling water jacket); the melting section of the second zone 190°C; 200°C in the homogenization section of the third zone; 200°C in the die of the die. The extrusion speed is 40m / min, negative pressure sizing formi...

Embodiment 2

[0032] Example 2: A cross-linked modified polyethylene hose with an inner diameter of 8 mm and a wall thickness of 2 mm was prepared.

[0033] The present embodiment adopts following raw material formula:

[0034] Polyethylene: 100kg;

[0035] Vinyltrimethoxysilane: 1kg;

[0036] Vinyltriethoxysilane: 0.5kg;

[0037] Dicumyl peroxide: 0.7kg;

[0038] Dibutyltin dilaurate: 0.2kg;

[0039] Antioxidant 330: 0.15kg;

[0040] Antioxidant 168: 0.1 kg.

[0041] Hoses were prepared from the above formulation compositions as follows:

[0042] 1. Mix the well-proportioned cross-linked polyethylene composition evenly.

[0043] 2. Add the mixed composition into the single-screw reaction extruder at one time, and control the temperature of each section of the extruder. The feeding section of the first zone is 165°C (the feeding port has a cooling water jacket); the melting section of the second zone 190°C; 200°C in the homogenization section of the third zone; 200°C in the die of t...

Embodiment 3

[0052] Example 3: A cross-linked modified polyethylene hose with an inner diameter of 10 mm and a wall thickness of 2 mm was prepared.

[0053] The present embodiment adopts following raw material formula:

[0054] Polyethylene: 100kg;

[0055] Vinyltrimethoxysilane: 1kg;

[0056] Vinyltriethoxysilane: 0.5kg;

[0057] Dicumyl peroxide: 0.7kg;

[0058] Dioctyltin dilaurate: 0.3kg;

[0059] Antioxidant 1010: 0.15kg;

[0060] Antiaging agent RD: 0.15kg.

[0061] Hoses were prepared from the above formulation compositions as follows:

[0062] 1. Mix the well-proportioned cross-linked polyethylene composition evenly.

[0063] 2. Add the mixed composition into the single-screw reaction extruder at one time, control the temperature of each section of the extruder, the feeding section of the first zone is 165°C (the feeding port has a cooling water jacket); the melting section of the second zone 190°C; 200°C in the homogenization section of the third zone; 200°C in the die of ...

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Abstract

The invention relates to hot water flexible tubes, and concretely relates to a method for producing silane crosslinked polyethylene hot water flexible tubes through a one-step process of a single screw extruder. The method for producing silane crosslinked polyethylene hot water flexible tubes through a one-step process of a single screw extruder has the advantages of obvious reduction of the equipment investment, reduction of the technological difficulty, and increase of the product competitiveness. The method comprises the following steps: adding raw materials to the single screw extruder, carrying out a grafting reaction and mixing of the raw materials through a fusing segment and a homogenizing segment, carrying out extrusion molding through a head grinding mouth, carrying out vacuum sizing, cooling, drawing and curling of the obtained extruded tubes to obtain grafted polyethylene tubes, and crosslinking the grafted polyethylene tubes in hot water to obtain the silane crosslinked polyethylene hot water flexible tubes, wherein the raw materials are composed of 100 parts by mass of a matrix resin, 0.5-5 parts by mass of a silane crosslinking agent, 0.05-0.5 parts by mass of a grafting initiator, 0.02-0.4 parts by mass of a crosslinking catalyst and 0.05-0.5 parts by mass of an antioxidant.

Description

technical field [0001] The invention relates to a hot water hose, in particular to a method for producing a silane cross-linked polyethylene hot water hose in one step with a single-screw extruder mainly suitable for water heater water pipes, geothermal water pipes and other hot water pipes. Background technique [0002] Special fluids, such as hot water, oil and natural gas, generally use various metal pipes. Metal pipes are not only bulky, but also may cause secondary pollution due to corrosion or scaling, resulting in waste of resources. At present, the materials that replace metal pipes are mainly polyvinyl chloride, EPDM rubber, high-density polyethylene, silane cross-linked polyethylene or metal-plastic composite pipes. High and low temperature, aging resistance, corrosion resistance and environmental sanitation, it is the most competitive pipe material. [0003] Silane cross-linked polyethylene is a method to obtain cross-linked polyethylene by grafting silane onto ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F2/01C08J3/24C08L51/06B29C47/92F16L11/04B29C48/92
CPCB29C48/022
Inventor 李磊张爱娟
Owner XIAMEN UNIV
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