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Pressure-resistant and tensile PE pipe and production method thereof

A production method and pipe technology, which are applied in metal material coating process, coating, hot dip plating process, etc., can solve the problems of difficulty in meeting use requirements, decreased durability, poor pressure resistance, etc., and avoid intermolecular relaxation effects. Effect

Inactive Publication Date: 2019-12-20
扬中市长龙管业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When PE pipes are used for water supply, mining and sewage discharge, because the pipes need to withstand the friction of the fluid contained in them to ensure their lifespan, non-polar thermoplastics with large molecular weight, high crystallinity, low melt viscosity, good fluidity and easy processing are usually selected. Resin high-density polyethylene, but high-density polyethylene resin has low tensile strength and poor pressure resistance, which leads to poor toughness and rigidity of PE pipes, and poor dimensional stability during molding processing, which is easy to cause pipe ends It is difficult to connect and install the size, the pipe is cracked by mechanical or chemical stress, the durability is reduced, and it is difficult to meet the needs of use

Method used

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  • Pressure-resistant and tensile PE pipe and production method thereof
  • Pressure-resistant and tensile PE pipe and production method thereof
  • Pressure-resistant and tensile PE pipe and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A pressure-resistant and tensile-resistant PE pipe production method, the method is as follows:

[0021] (1) Nitrogen protection is passed into the reaction kettle, and 62 parts of high-density polyethylene, 13 parts of monomer and 5 parts of initiator are successively dropped in by mass parts, and the number-average molecular weight of the high-density polyethylene is 10 to 20 10,000, carry out copolymerization reaction;

[0022] During the copolymerization process, first raise the temperature to 75°C at 10°C / min, then raise the temperature to 190°C at 30°C / min, keep the temperature for 3 hours, then cool down to 45°C at 20°C / min, and the stirring rate is 90r / min;

[0023] The monomer is 4-isopropylphenylacetic acid and 1,4-diacetoxybutane in a mass ratio of 2:3, and the initiator is dicumyl peroxide and dibenzoyl peroxide by mass Mix ratio 2:1;

[0024] Then wash and filter with acetone, place the filter cake in an acetone solution for reflux extraction for 2 hours,...

Embodiment 2

[0029] A pressure-resistant and tensile-resistant PE pipe production method, the method is as follows:

[0030] (1) Nitrogen protection is passed into the reaction kettle, and 55 parts of high-density polyethylene, 9 parts of monomer and 6 parts of initiator are successively dropped in by mass parts, and the number-average molecular weight of the high-density polyethylene is 10 to 20 10,000, carry out copolymerization reaction;

[0031] During the copolymerization process, first raise the temperature to 80°C at 10°C / min, then raise the temperature to 195°C at 30°C / min, keep it warm for 3-4 hours, then lower the temperature to 40°C at 20°C / min, and the stirring rate is 1100r / min;

[0032] The monomer is mixed in ethyl methacrylate and 1,4-diacetoxybutane in a mass ratio of 5:3, and the initiator is dibenzoyl peroxide;

[0033] Then wash and filter with acetone, place the filter cake in an acetone solution for reflux extraction for 2 hours, and dry to obtain a graft copolymer; ...

Embodiment 3

[0038] A pressure-resistant and tensile-resistant PE pipe production method, the method is as follows:

[0039] (1) Nitrogen protection is passed into the reaction kettle, and 62 parts of high-density polyethylene, 13 parts of monomer and 5 parts of initiator are successively dropped in by mass parts, and the number-average molecular weight of the high-density polyethylene is 10 to 20 10,000, carry out copolymerization reaction;

[0040] During the copolymerization process, first raise the temperature to 80°C at 10°C / min, then raise the temperature to 180°C at 30°C / min, keep it warm for 4 hours, then lower the temperature to 52°C at 20°C / min, and the stirring rate is 110r / min;

[0041] The monomer is formed by mixing ethyl methacrylate, 4-isopropylphenylacetic acid, isopropyl methacrylate and 1,4-diacetoxybutane in a mass ratio of 1:1:3:2, Described initiator is dicumyl peroxide;

[0042] Then wash and filter with acetone, place the filter cake in an acetone solution for ref...

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Abstract

The invention relates to a pressure-resistant and tensile PE pipe and a production method thereof. A medium-molecular weight high-density polyethylene is used as a polymer matrix, direct swelling graft copolymerization with a small molecule or a mixed monomer under the action of an initiator is carried out, the monomer is one or more of ethyl methacrylate, 4-isopropylphenylacetic acid, isopropyl methacrylate, and 1,4-diacetoxybutane, an auxiliary agent comprises one or more of an antioxidant, a light stabilizer, and a variable valence metal ion inhibitor, and a single-phase stable radical is formed. The PE pipe is extruded from a machine head by pre-plasticization compression, pipe demoulding pre-shaping is promoted by hot-dip galvanizing, vacuum sizing and cooling shaping are performed, and then traction cutting is performed, wear resistance and machining performance of the PE pipe are ensured, pressure-resistant and tensile properties are improved, environmental stress cracking is avoided, and the PE pipe is suitable of various drainage and pollution discharge, mining and gas pipelines.

Description

technical field [0001] The invention relates to a pressure-resistant and tensile-resistant PE pipe and a production method thereof, belonging to the technical field of PE pipes. Background technique [0002] PE pipe is a pipe made of polyethylene plastic. It has excellent resistance to most domestic and industrial chemicals. Compared with steel pipe, it does not need anti-corrosion treatment. At the same time, it has the advantages of light weight, convenient installation and movement, and is gradually replaced and widely Applied to various water, oil and gas pipeline transportation environments. When PE pipes are used for water supply, mining and sewage discharge, because the pipes need to withstand the friction of the fluid contained in them to ensure their life, they usually choose non-polar thermoplastics with large molecular weight, high crystallinity, low melt viscosity, good fluidity, and easy processing. Resin high-density polyethylene, but high-density polyethylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06C08F255/02C08F220/18C08F220/16C08F2/40C23C2/06C23C2/38
CPCC08F2/40C08F255/02C08L51/06C08L2203/18C23C2/06C23C2/38C08F220/16
Inventor 施金周
Owner 扬中市长龙管业有限公司
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