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Polyurethane rigid foam composition, thermal insulation layer and thermal insulation pipe

A technology of polyurethane rigid foam and composition, which is applied in the direction of protecting pipelines through thermal insulation, polyurea/polyurethane coatings, thermal insulation, etc., can solve the problems of easy agglomeration of the composition and uneven unevenness of the thermal insulation layer, so as to avoid the thermal insulation layer of the pipeline. The effect of unevenness, improving the effect of pipe spraying

Active Publication Date: 2015-12-30
北京碧海云智新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the leveling time of the polyurethane rigid foam composition is too long and the curing time is too short, the composition will quickly solidify before leveling, making the composition very prone to agglomeration, which will lead to unevenness of the insulation layer

Method used

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  • Polyurethane rigid foam composition, thermal insulation layer and thermal insulation pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Configure the polyurethane rigid foam composition, and place it in the sprayer for use, and its components and proportioning are as follows:

[0038] components

[0039] Using the polyurethane rigid foam composition above, prepare an insulation layer on the surface of the pipe by spraying. The specific method is as follows: rotate the pipe to be sprayed (DN300) on a fixed support at a speed of 6r / min. Using a Graco H-VR sprayer, the composition was heated to 70°C. Then, the spray head is set at a distance of 1m from the surface of the pipe to be sprayed, and the spray head is relatively moved in one direction along the axial direction of the pipe at a speed of 1m±0.1m / min to spray the above composition on the outer surface of the pipe . Among them, the surface temperature of the steel pipe is 20°C, and a pipe insulation layer is formed on the surface of the pipe after one-time molding.

Embodiment 2

[0041] Configure the polyurethane rigid foam composition, and place it in the sprayer for use, and its components and proportioning are as follows:

[0042] components

[0043] Utilize above-mentioned rigid polyurethane foam composition, adopt spraying method to prepare insulation layer on pipeline surface, specific method is as shown in embodiment 1.

Embodiment 3

[0045] Configure the polyurethane rigid foam composition, and place it in the sprayer for use, and its components and proportioning are as follows:

[0046] components

[0047] Potassium acetate

[0048] Utilize above-mentioned rigid polyurethane foam composition, adopt spraying method to prepare insulation layer on pipeline surface, specific method is as shown in embodiment 1.

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Abstract

The invention discloses a polyurethane rigid foam composition, a heat-insulation layer and a heat-insulation pipeline. The polyurethane rigid foam composition comprises following components in parts by weight: 95-230 parts of polyisocyanate, 45-95 parts of polyether polyol, 5-55 parts of polyester polyol, and proper amounts of a catalyst and a foaming agent, wherein the polyether polyol comprises at least two polyether polyols with different hydroxyl values. According to the polyurethane rigid foam composition, the polyisocyanate, the at least two polyether polyols and the polyester polyol are simultaneously added according to a ratio, so that the liquidity of the composition can be adjusted; different reaction systems are formed by the at least two polyols and the polyisocyanate so that the solidification speed of the composition can be adjusted; the common adjustment is carried out by the different polyols and isocyanate so that the leveling and solidification time of the composition can be matched. Furthermore, a phenomenon that the polyurethane rigid foam composition is thrown away by a rotary centrifugal force when the polyurethane rigid foam composition is coated in a pipeline is improved, and a phenomenon that the heat-insulation layer of the pipeline is uneven is improved.

Description

technical field [0001] The invention relates to the field of insulation pipe manufacturing, in particular to a polyurethane rigid foam composition, an insulation layer and an insulation pipe. Background technique [0002] The structure of polyurethane rigid foam insulation pipe mainly includes working steel pipe, polyurethane rigid foam insulation layer and polyethylene outer protection pipe from inside to outside. Among them, rigid polyurethane foam has the advantages of low density, high specific strength, good heat insulation effect, and simple molding process. The insulation layer made of it also has the characteristics of abrasion resistance and non-absorption. These advantages make polyurethane rigid foam widely favored in thermal insulation engineering, especially in cold insulation engineering. At present, polyurethane rigid foam insulation pipes have been widely used in the fields of district heating, district cooling, oil and gas, industrial liquid transmission a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/42C08J9/14C08J9/08C09D175/08C09D175/06F16L59/02C08G101/00
CPCC08G18/092C08G18/4018C08G18/4804C08G18/4883C08G18/5021C08G18/7664C08G2150/60C08J9/08C08J9/144C08J2203/02C08J2203/142C08J2203/184C09D175/06C09D175/08C08G2110/0025C08G2115/02F16L59/02
Inventor 任建鹏邸建军刘小平李依璇赖广森张凯昌
Owner 北京碧海云智新材料技术有限公司
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