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One-component polyurethane waterproof coating and preparation method thereof

A polyurethane waterproof, one-component technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of low tensile strength, poor erosion resistance and wear resistance, and easy occurrence of coating films, so as to improve the Effects of mechanical properties and foreign body puncture resistance, excellent mechanical properties and foreign body puncture resistance, good flexibility and elongation at break

Active Publication Date: 2020-01-14
上海固密特新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, single-component polyurethane coatings generally have shortcomings such as low tensile strength, especially poor erosion and wear resistance, which hinders its development in special fields.
On the other hand, the curing mechanism of the existing one-component polyurethane waterproof coating is that the prepolymer containing -NCO end group is cured to form a film, and releases CO 2 Gas, the construction can not be thick coating, the cured coating film is prone to defects such as lack of compactness, air bubbles and pinholes, which seriously affects the construction quality and popularization and application of single-component polyurethane waterproof coatings
Although the prior art (patent CN 102807812B) has achieved good results in reducing the cost of raw materials, its tensile strength is low (only 2.6-2.9MPa); Ma Jun et al. ("A high-strength single-component polyurethane Development of Waterproof Coatings "China Coatings, 2018, Volume 33, Issue 06: 66-69) The high-strength single-component polyurethane waterproof coating prepared has a tensile strength of up to 8.25MPa, which can only meet the waterproof requirements of ordinary buildings, but cannot meet the requirements of water conservancy projects. Special waterproofing needs of buildings

Method used

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  • One-component polyurethane waterproof coating and preparation method thereof
  • One-component polyurethane waterproof coating and preparation method thereof
  • One-component polyurethane waterproof coating and preparation method thereof

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preparation example Construction

[0047] The present invention also provides a method for preparing the one-component polyurethane waterproof coating described in the above technical scheme, comprising the steps of:

[0048] (1) mixing polyether polyol, filler, defoamer and dispersant, then grinding and drying to obtain a premix;

[0049] (2) In a protective atmosphere, add the dibasic acid ester solution of diisocyanate to the premix, heat up to 70-90°C and react at a constant temperature for 2 hours, then add the dibasic acid ester solution of the catalyst, and continue the constant temperature reaction for 0.5-1 hour; After completion, lower the temperature to 40-50°C, add the dibasic acid ester solution of castor oil-modified polyol, react at constant temperature for 0.5-1 hour, then add latent curing agent, organic acid and dibasic acid ester, and then undergo defoaming to obtain One-component polyurethane waterproof coating.

[0050] The invention mixes polyether polyol, filler, defoamer and dispersant,...

Embodiment 1

[0060] With 240g epoxy propylene polyether trihydric alcohol (number average molecular weight 5000), 10g epoxy propylene polyether trihydric alcohol (number average molecular weight 300), 15g epoxy propylene polyether glycol (number average molecular weight 1000), 5g Bisphenol A polyoxyethylene ether (hydroxyl value 230mKOH / g), 30g polytetramethylene glycol (number average molecular weight 2000), 2g carbon black, 70g titanium dioxide, 15g organic bentonite, 1.5g polyacrylate dispersant and 1.8g Silicone defoaming agent, after mixing evenly, grind it twice with a three-roller mill, and then dry it in a double planetary stirring tank at 120°C and -0.092MPa vacuum conditions for 2 hours to obtain a premix;

[0061] Cool the premixed material to 50°C, replace the vacuum with nitrogen to obtain a protective atmosphere, add the divalent acid ester solution of HMDI (containing 150g of HMDI), and then raise the temperature to 80°C for constant temperature reaction for 2h, then add the ...

Embodiment 2

[0063] With 240g epoxy propylene polyether trihydric alcohol (number average molecular weight 5000), 5g epoxy propylene polyether trihydric alcohol (number average molecular weight 300), 15g epoxy propylene polyether glycol (number average molecular weight 1000), 7g Bisphenol A polyoxyethylene ether (hydroxyl value 345mKOH / g), 15g polytetramethylene glycol (number average molecular weight 1000), 2g carbon black, 70g titanium dioxide, 15g organic bentonite, 1.5g polyacrylate dispersant and 1.8g Silicone defoaming agent, after mixing evenly, grind it twice with a three-roller mill, and then dry it in a double planetary stirring tank at 120°C and -0.092MPa vacuum conditions for 2 hours to obtain a premix;

[0064]Cool the premixed material to 50°C, replace the vacuum with nitrogen to obtain a protective atmosphere, add the divalent acid ester solution of HMDI (containing 150g of HMDI), and then raise the temperature to 80°C for constant temperature reaction for 2h, then add the di...

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Abstract

The invention provides a one-component polyurethane waterproof coating and a preparation method thereof, belonging to the technical field of waterproof coating. The one-component polyurethane waterproof coating provided by the invention comprises the following preparation raw materials in parts by mass: 15 to 20 parts of diisocyanate; 30 to 45 parts of polyether polyol; 6 to 10 parts of castor oilmodified polyol; 10 to 15 parts of divalent acid ester; 10 to 15 parts of filler; 2 to 8 parts of latent curing agent; 0.03 to 0.3 part of organic acid; 0.1 to 0.2 part of catalyst; 0.4-0.6 part of defoamer; 0.3-0.5 part of dispersant. The polyether polyol is a mixture of epoxy propylene polyether diol, epoxy propylene polyether triols, polybutylene glycol and bisphenol A polyether polyol. The one-component polyurethane waterproof coating provided by the invention has excellent mechanical properties, the tensile strength reaches more than 20MPa, the elongation at break is more than 450%, thetear strength is 55N / mm, and the advantage of short surface drying time is also provided.

Description

technical field [0001] The invention relates to the technical field of waterproof coatings, in particular to a single-component polyurethane waterproof coating and a preparation method thereof. Background technique [0002] In recent years, extreme weather has occurred more and more frequently, which puts forward higher requirements for the waterproof protection of hydraulic structures, especially the waterproof protection of hydraulic structures in the severe cold areas of Northwest my country is particularly important. Therefore, it is urgent to further research and develop waterproof coatings suitable for hydraulic structures in special areas. [0003] One-component polyurethane waterproof coatings are favored by many due to their convenient construction, no need for measurement, and excellent performance, and are expected to be used in hydraulic structures in special areas. However, at present, single-component polyurethane coatings generally have shortcomings such as l...

Claims

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Application Information

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IPC IPC(8): C09D175/14C09D7/61C09D7/63C09D7/65C09D7/20C08G18/48C08G18/75C08G18/36C08G18/66
CPCC08G18/36C08G18/4816C08G18/4825C08G18/4829C08G18/4833C08G18/6696C08G18/758C08K2003/2241C09D175/14C09D7/20C09D7/61C09D7/63C09D7/65C08L33/04C08K13/02C08K3/04C08K3/22C08K3/346C08K5/12
Inventor 王建莉徐荣归喻明洋朱永斌任银霞王彩峰刘浩杰张秋菊
Owner 上海固密特新材料科技有限公司
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