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Single-component heavy-duty corrosion-resistant polyurea for buried pipeline and preparation method of polyurea

A buried pipeline, one-component technology, applied in the field of polyurea, can solve the problems of inaccurate measurement of two-component systems, short gel time, limited use, etc., and achieves extended operation time, simple construction and improved work. The effect of efficiency

Inactive Publication Date: 2014-12-03
大连怿文新材料科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the two-component spray polyurea gel has a short time and complex process, and is not suitable for small-area repair of the outer wall coating of buried pipelines. However, the two-component system cannot be accurately measured in harsh environments and its use is limited. In view of the disadvantages of anti-corrosion, a single-component heavy-duty anti-corrosion polyurea for external anti-corrosion of buried pipelines is proposed, which is superior in oil resistance, liquid medium resistance, weather resistance and aging resistance, and has basically the same mechanical properties as the anti-corrosion polyurea on the outer wall of the pipeline. Excellent adhesion

Method used

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  • Single-component heavy-duty corrosion-resistant polyurea for buried pipeline and preparation method of polyurea
  • Single-component heavy-duty corrosion-resistant polyurea for buried pipeline and preparation method of polyurea
  • Single-component heavy-duty corrosion-resistant polyurea for buried pipeline and preparation method of polyurea

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Experimental program
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Embodiment 1

[0042] This embodiment discloses a single-component heavy-duty anti-corrosion polyurea for buried pipelines, which includes the following components by weight:

[0043]

[0044] The preparation method of single-component heavy-duty anti-corrosion polyurea for buried pipelines provided in this embodiment:

[0045] ① Add castor oil, Desmophen NH1420, 800 mesh light calcium, and carbon black into the container according to the above weight parts, stir the liquid material at a low speed for 5 minutes, heat it to 110~120°C, turn on the vacuum pump, and the vacuum degree is -0.1~- 0.08MPa, vacuum dehydration for 2h, remove a small amount of water contained in the raw material, check that the moisture content is below 3 / 10,000, and cool to a liquid temperature of about 25 °C.

[0046] ②Add butyl acetate and HDI into the above container by weight, heat up to 50°C, stir and react for 1 hour, slowly heat up to 110-120°C after the reaction exotherm ends, keep the reaction for 8h, take...

Embodiment 2

[0053] This embodiment discloses a single-component heavy-duty anti-corrosion polyurea for buried pipelines, which includes the following components by weight:

[0054]

[0055]

[0056] The preparation method of single-component heavy-duty anti-corrosion polyurea for buried pipelines provided in this embodiment:

[0057] ①Add polyoxypropylene ether polyol PPG-1000, Desmophen NH1420, 800-mesh light calcium, 800-mesh talcum powder, and carbon black into the container according to the above weight parts, stir the liquid material at low speed for 5 minutes, and heat it to 110-120 ℃, turn on the vacuum pump, the vacuum degree is -0.1~-0.08MPa, vacuum dehydration for 2h, remove a small amount of water contained in the raw material, detect the moisture content below 3 / 10,000, and cool to the liquid temperature of about 25℃.

[0058] ②Add butyl acetate and MDI into the above container by weight, heat up to 50°C, stir and react for 1 hour, slowly heat up to 80-90°C after the rea...

Embodiment 3

[0065] This embodiment discloses a single-component heavy-duty anti-corrosion polyurea for buried pipelines, which includes the following components by weight:

[0066]

[0067] The preparation method of single-component heavy-duty anti-corrosion polyurea for buried pipelines provided in this embodiment:

[0068] ①Add polyoxypropylene ether polyol PPG-1000, Desmophen NH1420, 800 mesh talc and carbon black into the container according to the above weight parts, stir the liquid material at low speed for 5 minutes, heat it to 110~120℃, turn on the vacuum pump, The vacuum degree is -0.1~-0.08MPa, vacuum dehydration for 2h, remove a small amount of water contained in the raw material, detect the moisture content below 3 / 10,000, and cool to the liquid material temperature of about 25 ℃.

[0069] ②Add butyl acetate and HMDI into the container by weight, heat up to 50°C, stir and react for 0.5 hours, after the reaction exotherm is over, add MDI, slowly heat up to 80~90°C, keep the ...

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Abstract

The invention discloses single-component heavy-duty corrosion-resistant polyurea for a buried pipeline. The polyurea is prepared from the following components in parts by weight: 25-70 parts of isocyanate, 50-80 parts of polyalcohol, 5-30 parts of hindered amine compound, 10-30 parts of solvent, 5-40 parts of filler, 0.5-2 parts of defoamer, 0.5-2 parts of catalyst, 1-3 parts of pigment, 5-15 parts of latent curing agent, 5-10 parts of water absorbent and 1-3 parts of retarder, wherein the isocyanate is aliphatic isocyanate and / or aromatic isocyanate. The hindered amine compound is added into the single-component heavy-duty corrosion-resistant polyurea, so that a urea group is introduced in the component to increase the polarity of the component, thereby increasing the attraction of a hard segment of the single-component heavy-duty corrosion-resistant polyurea. The single-component heavy-duty corrosion-resistant polyurea is more compact, and the oil resistance, the medium resistance and the microbial resistance of the single-component heavy-duty corrosion-resistant polyurea are improved. The single-component heavy corrosion-resistant polyurea disclosed by the invention can be used for repairing a heavy-duty corrosion-resistant coating for the buried pipeline.

Description

technical field [0001] The invention relates to polyurea technology, in particular to a single-component heavy-duty anti-corrosion polyurea for buried pipelines and a preparation method thereof. Background technique [0002] With the development of the national economy, buried pipelines, as important urban and rural infrastructure and logistics channels, play an important role in social and economic life. The many advantages of buried pipelines are increasingly recognized by the public, but the various problems caused by the leakage of buried pipelines are also increasingly valued by the public. The environment in which the buried pipeline is located is complex and changeable, and the corrosion situation is complicated. [0003] The outer wall of the buried pipeline is mainly affected by soil corrosion, including soil type, soil resistivity, soil water content (humidity), pH, sulfide content, redox potential, stray current and interference current, microorganisms, plant roo...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D5/08C09D7/12C08G18/79C08G18/75C08G18/73C08G18/76C08G18/67C08G18/66
Inventor 姜鹏波彭瑞史立彤季春波孙世刚蓝晨
Owner 大连怿文新材料科技发展有限公司
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