All-water perforated hard polyurethane foam for submarine pipeline joints

A technology of hard polyurethane and water boiling, applied in the field of polyurethane foam, can solve the problems of mastic anti-corrosion layer damage, low compressive strength, large raw material footprint, etc., to achieve shortened laying construction time, high compressive strength, The effect of low construction cost

Active Publication Date: 2012-10-17
TIANJIN AIDEJIA TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, domestic subsea pipeline joints mainly adopt the joint technology of asphalt mastic pouring, that is, the structure of "working steel pipe + anti-corrosion layer + asphalt mastic", but this joint material has the following disadvantages: ① It takes up a lot of space in offshore site installation , a large mastic melting furnace is required on the pipe-laying ship, and the raw material covers a large area; ②It needs to be heated to 200°C during use, which is easy to cause burns and combustion; ③The melted mastic is easy to cause damage to the anti-corrosion layer. Destruction; ④Because asphalt mastic contains strong carcinogens (3,4-benzopyrene), the smoke is relatively large when heated, producing harmful gases, polluting the environment, and posing a threat to seawater and marine life. At the same time, it needs to be cooled by water for solidification ; ⑤ It is necessary to manually fill the joints, which is easy to cause cavities and burns
Because the polyol used in this patent has a lower hydroxyl value and a larger molecular weight, the crosslinking density of the obtained polyurethane decreases, and the mechanical properties of the foam, such as compressive strength, decrease significantly.
Low compressive strength is not suitable for high-strength and high-density full-water open-cell rigid polyurethane foam that needs to withstand seawater hydrostatic pressure, steel pipe weight, etc. in submarine pipeline joints

Method used

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  • All-water perforated hard polyurethane foam for submarine pipeline joints
  • All-water perforated hard polyurethane foam for submarine pipeline joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of preparation method of amido grafted polyether polyol, comprises the steps:

[0033] Use 15 parts of glycerin as the initiator, 15 parts of sucrose as the initiator, 10 parts of ethylene oxide, 70 parts of propylene oxide as the polymer monomer, and 0.7 parts of potassium hydroxide as the catalyst at 100 ° C and 0.4 MPa pressure Carry out ring opening and keep warm for 3 hours to obtain the basic polyether. On this basis, add 3 parts of amide-based monomer (N, N-dimethylacrylamide) and 0.2 parts of azobisisobutylcyanide as the initiator at 70 ° C And under the protection of nitrogen, it is formed by free radical grafting polymerization, and then undergoes neutralization and refining steps to obtain amido grafted polyether polyol.

Embodiment 2

[0035] A preparation method of full water open-cell rigid polyurethane foam, comprising the steps of:

[0036] Preparation of component A: Take 70 parts of amide-based grafted polyether polyols prepared in Example 1, 1 part of rigid polyether polyols with sorbitol as the initiator and a hydroxyl value between 400 and 600 mgKOH / g, 29 parts of rigid polyether polyol with a hydroxyl value of 250-500 mgKOH / g, 0.5 part of N, N-dimethylcyclohexylamine, N, N, N', N', N 0.1 part of ″-pentamethyldiethylenetriamine, 0.25 part of N,N-dimethylbenzylamine, and 0.2 part of water were added in order, and stirred for 30 minutes to make the system uniformly mixed to obtain component A;

[0037] After mixing component A and component B polymethylene polyphenyl polyisocyanate at 25°C in a weight ratio of A:B=1:1.10,

[0038] That is, the full water open-cell rigid polyurethane foam of the present invention is obtained.

[0039] Response performance: Milk white time 15s, gel time 65s

[0040] ...

Embodiment 3

[0042] A preparation method of full water open-cell rigid polyurethane foam, comprising the steps of:

[0043] Preparation of component A: Take 50 parts of the amido-grafted polyether polyol prepared in Example 1, 10 parts of rigid polyether polyol with sorbitol as the initiator and a hydroxyl value between 400 and 600 mgKOH / g, 40 parts of rigid polyether polyol with a hydroxyl value between 250 and 500 mgKOH / g, 0.5 part of N, N-dimethylcyclohexylamine, and 0.1 part of N, N-dimethylbenzylamine with propylene glycol as the initiator , 0.2 parts of water are added in order, and stirred for 30 minutes to make the system mix until uniform, and obtain component A;

[0044] After mixing component A and component B polymethylene polyphenyl polyisocyanate at 25°C in a weight ratio of A:B=1:1.20, the full water open-cell rigid polyurethane foam of the present invention can be obtained.

[0045] Response performance: milk white time 30s, gel time 100s.

[0046] Foam performance: free ...

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Abstract

The invention relates to an all-water perforated hard polyurethane foam for submarine pipeline joints, which is formed by carrying out chemical reaction after evenly mixing a polyether glycol mixture and polymethylene polyphenyl polyisocyanate in a weight ratio of 1:(1.1-1.8), wherein the polyether glycol mixture comprises the following components in parts by weight: 100 parts of one or more polyether glycols, 0-1.5 parts of catalyst and 0-0.5 part of water; and the polyether glycol mixture at least contains one amido grafted polyether glycol, of which the hydroxyl value is 200-450mg KOH / g and the functionality is 2-5. The perforated hard polyurethane foam provided by the invention has the advantages of high density (120kg / m<3>), high perforation rate (70-90%) and high water absorption rate (the weight water absorptivity can reach 400-900% within one hour).

Description

technical field [0001] The invention relates to a polyurethane foam, in particular to an all-water perforated rigid polyurethane foam used for joint construction of pipeline joints during laying of submarine thermal insulation / counterweight pipelines. Background technique [0002] At present, domestic subsea pipeline joints mainly adopt the joint technology of asphalt mastic pouring, that is, the structure of "working steel pipe + anti-corrosion layer + asphalt mastic", but this joint material has the following disadvantages: ① It takes up a lot of space in offshore site installation , a large mastic melting furnace is required on the pipe-laying ship, and the raw material covers a large area; ②It needs to be heated to 200°C during use, which is easy to cause burns and combustion; ③The melted mastic is easy to cause damage to the anti-corrosion layer. Destruction; ④Because asphalt mastic contains strong carcinogens (3,4-benzopyrene), the smoke is relatively large when heated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08G18/63C08G18/48C08G65/28C08F283/06C08G101/00
Inventor 马丽红梁辰林涛张凯张汝民其他发明人请求不公开姓名
Owner TIANJIN AIDEJIA TECH CO LTD
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