ESEPI prefabricated heat-preservation directly-buried heat-resistant high-density polyethylene low-temperature heat supply composite pipe

A high-density polyethylene and composite pipe technology, applied in the direction of thermal insulation, protection of pipes and pipes through thermal insulation, etc. problem, to achieve good thermal insulation effect, small molding shrinkage, good crack resistance strength

Active Publication Date: 2021-11-30
黑龙江贞财管道有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the properties of polyurethane rigid foam and the formation method of the insulation layer will directly affect the performance and service life of the insulation pipe.
If the density of polyurethane rigid foam is too low, the insulation layer is prone to carbonization, which affects the insulation effect; or the traditional "pipe-in-pipe process" is used to inject polyurethane rigid foam, resulting in uneven molding of polyurethane foam, which may easily cause local cavities and affect the insulation pipe insulation performance and other issues

Method used

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  • ESEPI prefabricated heat-preservation directly-buried heat-resistant high-density polyethylene low-temperature heat supply composite pipe
  • ESEPI prefabricated heat-preservation directly-buried heat-resistant high-density polyethylene low-temperature heat supply composite pipe
  • ESEPI prefabricated heat-preservation directly-buried heat-resistant high-density polyethylene low-temperature heat supply composite pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Preparation of white material in the components of rigid polyurethane foam:

[0063] Including ingredients:

[0064] Polyoxypropylene glycol 30 parts, aliphatic polyester polyol 10 parts, monofluorodichloroethane 10 parts, polysiloxane 2 parts, dibutyltin dilaurate 0.5 parts, triethyl phosphate 5 parts, expandable 10 parts of graphite;

[0065] Preparation:

[0066] Mix aliphatic polyester polyol, polyoxypropylene glycol, and expandable graphite evenly, then add monofluorodichloroethane, polysiloxane, triethyl phosphate, and dibutyltin dilaurate, and mix evenly to obtain polyol Composition, i.e. white material;

[0067] Preparation of high-density polyethylene pipes for coiled high-toughness sprinkler irrigation:

[0068] (1) Perform surface decontamination and cleaning pretreatment on the outer wall of PE-RT II heat-resistant polyethylene pipe;

[0069] (2) Prepare an insulation layer on the outer wall of the pretreated working tube:

[0070] 1) Fixed working tub...

Embodiment 2

[0077] Preparation of white material in the components of rigid polyurethane foam:

[0078] Including ingredients:

[0079] 50 parts of polytetrahydrofuran ether glycol, 30 parts of aromatic polyester polyol, 30 parts of fluorodichloroethane, 4 parts of polysiloxane, 1.5 parts of triethylenediamine, tris(dipropylene glycol) phosphite 15 parts, 25 parts of expandable graphite;

[0080] Preparation:

[0081] Mix aromatic polyester polyol, polytetrahydrofuran ether glycol, and expandable graphite evenly, then add fluorodichloroethane, polysiloxane, tris(dipropylene glycol) phosphite and triethylenediamine, Mix evenly to obtain polyol composition, ie white material.

[0082] The preparation process of the coiled high-toughness high-density polyethylene pipe for sprinkler irrigation is the same as in Example 1.

Embodiment 3

[0084] Including ingredients:

[0085] 20 parts of polyoxypropylene diol, 20 parts of polytetrahydrofuran ether diol, 10 parts of aliphatic polyester polyol, 10 parts of aromatic polyester polyol, 20 parts of fluorodichloroethane, 3 parts of polysiloxane , 1 part of triethanolamine, 5 parts of triethyl phosphate, 5 parts of tris(dipropylene glycol) phosphite, 15 parts of expandable graphite;

[0086] Preparation:

[0087] Mix aliphatic polyester polyol, aromatic polyester polyol, polyoxypropylene glycol polytetrahydrofuran ether glycol and expandable graphite evenly, then add fluorodichloroethane, polysiloxane, triethyl phosphate Ester, tris(dipropylene glycol) phosphite and triethanolamine are uniformly mixed to obtain a polyol composition, that is, a white material.

[0088] The preparation process of the coiled high-toughness high-density polyethylene pipe for sprinkler irrigation is the same as in Example 1.

[0089] In Examples 1-3, the selected black material is PM200...

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Abstract

The invention discloses an ESEPI prefabricated heat-preservation directly-buried heat-resistant high-density polyethylene low-temperature heat supply composite pipe which is composed of an outer protective pipe, a heat-preservation layer and a working pipe. The outer protective pipe is a high-density polyethylene pipe, the heat-preservation layer is hard polyurethane foam plastic, and the working pipe is a heat-resistant polyethylene (PE-RT II type) pipe. The ESEPI prefabricated heat-preservation directly-buried heat-resistant high-density polyethylene low-temperature heat supply composite pipe prepared by the invention has excellent heat resistance, corrosion resistance, impact resistance and sealing performance, and is convenient to construct and maintain, beneficial to reducing heat loss in a conveying link, long in service life, and suitable for a secondary pipe network system for central heating and cold and hot water systems for life, air conditioners, solar energy and the like.

Description

technical field [0001] The invention relates to the technical field of prefabricated thermal insulation directly buried pipelines, in particular to an ESEPI prefabricated thermal insulation direct buried heat-resistant high-density polyethylene low-temperature heating composite pipe. Background technique [0002] The heating season in northern my country is from November to next March. The energy loss of the heating system is mainly reflected in the low heat utilization efficiency. Among them, the loss in the pipe network accounts for more than 20% of the energy loss, and the energy waste is serious. The use of traditional steel pipes as heat supply pipes has problems such as poor corrosion resistance, short service life, and high maintenance costs. [0003] High-density polyethylene direct-buried prefabricated insulation pipe is an excellent new type of pipe that has appeared in the world in recent years. It has been widely used for its excellent thermal insulation, anti-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/12F16L57/02F16L58/10F16L59/02F16L59/10B29C44/12B29C70/34B29C70/68C08G18/48C08G18/42C08K5/521C08K7/24C08K5/524C08J9/14C08L75/04C08G101/00
CPCF16L9/123F16L57/02F16L59/028F16L59/02F16L59/10F16L58/10B29C70/68B29C70/34B29C44/12C08G18/4825C08G18/42C08G18/4854C08G18/4018C08K5/521C08K7/24C08K5/524C08J9/144C08J9/0038C08J9/0066C08J9/0095Y02E10/10
Inventor 崔健伟张喜宝姜洪坤范占新王贤旸
Owner 黑龙江贞财管道有限公司
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