Rigid polyurethane-coated polyethylene-twisted prefabricated directly-buried insulation pipe and preparation method thereof

A rigid polyurethane, prefabricated direct burial technology, applied in the direction of thermal insulation, pipeline protection through thermal insulation, pipeline protection, etc., can solve the problems of reducing the life of the pipe network, inconsistent movement of each other, increased thermal insulation energy consumption, etc., and prolong the service life. , the density is uniform, the effect of strengthening the bonding strength

Active Publication Date: 2019-12-20
内蒙古伟之杰节能装备有限公司
View PDF13 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to ensure the thermal insulation effect of the pipeline, a variety of thermal insulation materials are used in the above-mentioned prior art. In the actual working environment, the temperature change causes the thermal expansion and cold contraction of the material. Due to the phase transition of different materials, the mutual movement between the layers is inconsistent, resulting in Heat preservation energy consumption increases, and even reduces the service life of the pipe network

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rigid polyurethane-coated polyethylene-twisted prefabricated directly-buried insulation pipe and preparation method thereof
  • Rigid polyurethane-coated polyethylene-twisted prefabricated directly-buried insulation pipe and preparation method thereof
  • Rigid polyurethane-coated polyethylene-twisted prefabricated directly-buried insulation pipe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The present invention also provides a preparation method for the above-mentioned rigid polyurethane spray-coated polyethylene winding prefabricated direct-buried thermal insulation pipe, comprising the following steps:

[0048] S1, according to mass ratio 1:0.75-0.8, the polyether polyol of mass ratio 100:1 and nano cerium oxide alcohol dispersion liquid white material and polyisocyanate black material are mixed evenly, spray polyurethane foam on steel pipe body, obtain polyurethane foam layer;

[0049] S2, aging the polyurethane foam layer obtained in step S1 at 20-30° C. for 8-10 hours to obtain a polyurethane insulation layer with a thickness of 30-100 mm;

[0050] S3, coating the surface of the polyurethane insulation layer obtained in step S2 with nano-rare earth mixed powder composed of cyclodextrin and nano-rare earth with a mass ratio of 2-3:1, to obtain a rare-earth connection layer with a thickness of 0.5-1 μm;

[0051] S4, melting and plasticizing the high-d...

Embodiment 1

[0054] Example 1 Rigid polyurethane spray-coated polyethylene winding prefabricated direct-buried thermal insulation pipe and preparation method thereof

[0055] A rigid polyurethane spray-coated polyethylene winding prefabricated direct-buried thermal insulation pipe, which sequentially includes a steel pipe body, a 30mm thick polyurethane thermal insulation layer, a 0.5μm thick rare earth connection layer and a 4mm thick high density polyethylene outer protective layer from the inside to the outside;

[0056] The rare earth connecting layer is composed of cyclodextrin and nano rare earth cerium oxide with a mass ratio of 2:1.

[0057] Its preparation method comprises the following steps:

[0058] S1. According to the mass ratio of 1:0.75, mix the polyether polyol polyol and nano-cerium oxide alcohol dispersion white material and polyisocyanate black material with a mass ratio of 100:1 evenly, spray polyurethane foam on the steel pipe body, and obtain polyurethane foam layer...

Embodiment 2

[0064] Example 2 Rigid polyurethane sprayed polyethylene winding prefabricated direct buried insulation pipe and preparation method thereof

[0065] A rigid polyurethane spray-coated polyethylene winding prefabricated direct-buried thermal insulation pipe, which sequentially includes a steel pipe body, a 100mm thick polyurethane thermal insulation layer, a 1μm thick rare earth connection layer and a 9mm thick high density polyethylene outer protective layer from the inside to the outside;

[0066] The rare earth connecting layer is composed of cyclodextrin and nano rare earth cerium oxide with a mass ratio of 3:1.

[0067] Its preparation method comprises the following steps:

[0068] S1. According to the mass ratio of 1:0.8, mix the polyether polyol polyol with a mass ratio of 100:1 and nano-cerium oxide alcohol dispersion white material and polyisocyanate black material, spray polyurethane foam on the steel pipe body, and obtain polyurethane foam layer;

[0069] S2. Aging ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
densityaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a rigid polyurethane-coated polyethylene-twisted prefabricated directly-buried insulation pipe. The rigid polyurethane-coated polyethylene-twisted prefabricated directly-buriedinsulation pipe sequentially comprises a steel pipe body, a polyurethane insulation layer, a rare earth connecting layer and an outer protective layer from inside to outside. A preparation method ofthe rigid polyurethane-coated polyethylene-twisted prefabricated directly-buried insulation pipe comprises the following steps that S1, polyurethane is foamed; S2, curing is carried out; S3, the surface of the polyurethane insulation layer obtained in Step S2 is coated with nano rare earth mixed powder to obtain the rare earth connecting layer; S4, high-density polyethylene is molten and plastified to extrude a belt film which continuously wraps the surface of the rare earth connecting layer obtained in Step S3 so as to form the high-density polyethylene protective layer; S5, grinding is carried out through a rubber roller; and S6, water cooling is carried out to obtain the prefabricated directly-buried insulation pipe. Compared with the prior art, the prefabricated directly-buried insulation pipe is good in long-term temperature resistance, uniform in density, low in shrinkage rate and good in stability.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation pipes, and in particular relates to a rigid polyurethane spray-coated polyethylene winding prefabricated direct-buried thermal insulation pipe and a preparation method thereof. Background technique [0002] Insulation pipe is the abbreviation of heat insulation pipe. The heat preservation pipe is used for the transportation of liquid, gas and other media. [0003] The prefabricated direct buried insulation pipe is composed of working steel pipe, rigid polyurethane foam insulation layer and high-density polyethylene outer protection pipe. The polyethylene outer protective pipe is made of high-density polyethylene material, which can ensure that the pipe is not damaged by external factors during transportation, installation and use. The insulation layer material has a density greater than 60kg / m 3 High-quality rigid polyurethane foam, the foam fully fills the gap between the steel pipe a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): F16L59/02B29D23/00
CPCB29D23/001F16L59/029
Inventor 闫明海
Owner 内蒙古伟之杰节能装备有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap