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Sun-proof anti-aging polyethylene pipe

A polyethylene pipe, anti-aging technology, applied in pipeline protection, chemical instruments and methods, pipeline damage/wear prevention, etc., can solve the performance of pipes used above the ground or exposed to sunlight, limit the application scope of polyethylene pipes, The performance of polyethylene pipes is reduced and other problems, so as to expand the application range and safety factor, improve the performance of light fastness, thermal oxygen resistance and photoaging, and improve light fastness.

Inactive Publication Date: 2014-04-23
浙江经纬集团环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the pipe is used above the ground or exposed to sunlight, the performance and service life of the pipe will be greatly reduced, because polyethylene materials are not resistant to thermal, oxygen and photoaging, and will age and degrade in the air and sunlight for a long time. The performance of polyethylene pipes decreases, which affects the use, and the protective layer on the outside of the pipes will increase the construction cost. It can only be buried in the ground or inside the building wall to ensure the service life, which limits the application range of polyethylene pipes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The outer layer raw material composition of the present embodiment is by weight:

[0041] mLLDPE60 parts,

[0042] 40 copies of EPDM,

[0043] 3 parts of chain extender dihydroxymethyl-formaldehyde resin,

[0044] 0.5 parts of chain extender 2,5-2 methyl-2,5-bis(tert-butyl peroxy)hexane,

[0045] Catalyst SnCl 2 2H 2 O 0.4 parts,

[0046] 7 parts of carbon black,

[0047] 2 parts of titanium dioxide,

[0048] 0.5 parts of anti-aging agent 2,2,4-trimethyl-1,2-dihydroquinoline polymer,

[0049] Anti-aging agent thiourea derivative 0.5 part,

[0050] 1.3 parts of calcium stearate.

[0051] The above-mentioned components are mixed by a high-speed mixer, and then added to a single-screw extruder with an aspect ratio of not less than 36 to extrude the outer sun-resistant and anti-aging protective layer 2 of the pipe at an extrusion temperature of 160-190°C. The HDPE compound with a carbon black content of more than 2% and a carbon black dispersion of less than grade...

Embodiment 2

[0053] The outer layer raw material composition of the present embodiment is by weight:

[0054] mLLDPE60 parts,

[0055] 40 copies of EPDM,

[0056] 1.5 parts of chain extender 2,5-2 methyl-2,5-bis(tert-butyl peroxy)hexane,

[0057] Catalyst SnCl 2 2H 2 O 0.4 parts,

[0058] 7 parts of carbon black,

[0059] 2 parts of titanium dioxide,

[0060] 0.5 parts of anti-aging agent 2,2,4-trimethyl-1,2-dihydroquinoline polymer,

[0061] Anti-aging agent thiourea derivative 0.5 part,

[0062] 1.3 parts of calcium stearate.

[0063] The above-mentioned components are formed into pipes according to the method of Example 1. The performance test index of the pipe is shown in Table 1.

Embodiment 3

[0065] The outer layer raw material composition of the present embodiment is by weight:

[0066] mLLDPE60 parts,

[0067] 40 copies of EPDM,

[0068] 3 parts of chain extender dihydroxymethyl-formaldehyde resin,

[0069] 0.5 parts of chain extender 2,5-2 methyl-2,5-bis(tert-butyl peroxy)hexane,

[0070] Catalyst SnCl 2 2H 2 O 0.4 parts,

[0071] 7 parts of carbon black,

[0072] 2 parts of titanium dioxide,

[0073] 1 part of anti-aging agent 2,2,4-trimethyl-1,2-dihydroquinoline polymer,

[0074] 1.3 parts of calcium stearate.

[0075] The above-mentioned components are formed into pipes according to the method of Example 1. The performance test index of the pipe is shown in Table 1.

[0076] Table 1 Anti-aging properties of light-resistant and anti-aging polyethylene pipes

[0077]

[0078] It can be seen from Table 1 that the light-resistant and anti-aging polyethylene pipe prepared in Example 1 has the best anti-aging performance, and the compounding of chain ...

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Abstract

The invention relates to a sun-proof anti-aging polyethylene pipe comprising two layers of an inner layer and an outer layer, the inner layer is a pipe main body, and the outer layer is a sun-proof anti-aging protective layer. The outer layer thickness is 10%-15% of the overall pipe wall thickness, but is not less than 1mm. The outer layer material comprises the following components: by weight, 50-70 parts of mLLDPE (metallocene polyethylene), 50-30 parts of EPDM (ethylene-propylene-diene monomer), 0.3-4 parts of a chain extender, 0.2-0.5 part of a catalyst, 5-10 parts of carbon black, 1-2 parts of titanium dioxide, 0.5-1.5 parts of an antioxidant and 1-2 parts of a dispersant; the inner layer material is a HDPE (high-density polyethylene) composite material with the carbon black content being more than 2% and the carbon black grade being less than grade 3. The polyethylene pipe is prepared by high-speed mixing and mixed plasticizing of the outer layer material then use of a composite die for extrusion molding of the outer layer material and the inner layer material, compared with ordinary polyethylene pipes, the anti-aging performance is improved, the pipe service life is prolonged, the sun-proof anti-aging polyethylene pipe can be exposed on the earth surface for use, and the application scope of the polyethylene pipe can be expanded.

Description

technical field [0001] The invention relates to the technical field of plastic pipes, in particular to a sun-resistant and anti-aging polyethylene pipe. Background technique [0002] Polyethylene pipe has the advantages of good flexibility, strong corrosion resistance, no rust, safety and sanitation, convenient hot-melt connection, long service life, etc. It is widely used in water supply, gas, sewage, irrigation and other fields. Use for 50 years. However, if the pipe is used above the ground or exposed to sunlight, the performance and service life of the pipe will be greatly reduced, because polyethylene materials are not resistant to thermal, oxygen and photoaging, and will age and degrade in the air and sunlight for a long time. The performance of polyethylene pipes is degraded, which affects the use, and the protective layer on the outside of the pipes will increase the construction cost. It can only be buried underground or in the walls of buildings to ensure the serv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B1/08B32B27/08B32B27/18B32B27/32C08L23/08C08L23/16C08L23/06C08K13/02C08K3/04C08K3/22C08K5/405C08K5/098C08K5/14C08K5/09F16L57/04F16S3/00
Inventor 杨宝生王顺海
Owner 浙江经纬集团环保工程有限公司
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