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Single-component solvent-free polyurethane coating and preparation method thereof

A solvent-free polyurethane, one-component technology, applied in the field of coatings, can solve the problems that it is not easy to achieve the performance of two-component polyurethane waterproof coatings, volatile organic compound pollution, large prepolymer molecular weight, etc., and achieve good environmental performance and low VOC content. Low, the effect of improving the bonding performance

Pending Publication Date: 2022-05-06
SHANGHAI ZHENGOU IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the one-component polyurethane waterproof coating, it is not easy to achieve the performance of the two-component polyurethane waterproof coating
Therefore, when the one-component polyurethane waterproof coating is prepared, a relatively large molecular weight of the prepolymer is often required, resulting in a high viscosity.
At present, in order to meet the requirements of construction and application, it is necessary to add a certain amount of organic solvent to adjust the viscosity of the one-component polyurethane waterproof coating, thus causing the pollution of volatile organic compounds

Method used

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  • Single-component solvent-free polyurethane coating and preparation method thereof
  • Single-component solvent-free polyurethane coating and preparation method thereof
  • Single-component solvent-free polyurethane coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0057] A kind of castor oil resin, each component and corresponding weight thereof are as shown in table 1, and prepare and obtain by following steps:

[0058] Mix castor oil and polyol, and stir and mix for 2 hours under nitrogen atmosphere at 220°C, then add dicarboxylic acid at 150°C, stir and mix for 0.5h, then stir and mix for 1 hour at 210°C to obtain Castor oil resin.

[0059] After testing, the hydroxyl value of castor oil resin is 200mgKOH / g.

preparation example 2

[0061] A kind of castor oil resin, each component and corresponding weight thereof are as shown in table 1, and prepare and obtain by following steps:

[0062] Mix castor oil and polyol, and stir and mix for 2 hours under nitrogen atmosphere at 200°C, then add dicarboxylic acid at 180°C, stir and mix for 0.5h, and then stir and mix for 1 hour at 150°C to obtain Castor oil resin.

[0063] After testing, the hydroxyl value of castor oil resin is 300mgKOH / g.

preparation example 3-6

[0065] A kind of castor oil resin, differs from Preparation Example 2 in that each component and its corresponding weight are as shown in Table 1.

[0066] Each component and its weight (kg) in table 1 preparation example 1-5

[0067]

[0068] In the preparation examples of the present application, only a brief description will be made by taking polyhydric alcohol, which is composed of allyl alcohol and pentaerythritol in a weight ratio of 1:1.6, as an example. Because when polyhydric alcohol is obtained by the weight ratio defined in the application by allyl alcohol and pentaerythritol, the impact on the castor oil resin hydroxyl value is approximately the same, and the gained castor oil resin hydroxyl value is within 400-500mgKOH / g. Therefore, it does not affect the application of the polyhydric alcohol in the application of the formula composed of allyl alcohol and pentaerythritol according to other weight ratios of the application.

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Abstract

The invention relates to the technical field of coatings, in particular to a single-component solvent-free polyurethane coating and a preparation method thereof. The single-component solvent-free polyurethane coating is prepared from the following raw materials in parts by weight: 9 to 14 parts of castor oil resin, 32 to 45 parts of polyether polyol, 5 to 15 parts of isocyanate, 0.4 to 1.8 parts of latent curing agent, 5 to 15 parts of talcum powder and 10 to 15 parts of calcium carbonate. The castor oil resin is prepared by mixing dicarboxylic acid, polyhydric alcohol and castor oil; the preparation method comprises the following steps: mixing the polyether polyol, the talcum powder, the calcium carbonate and the other auxiliary agents, and dehydrating to obtain a mixture A; adding castor oil resin and isocyanate into the mixture A, and carrying out heat preservation reaction to obtain a mixture B; and adding a latent curing agent into the mixture B, and stirring and mixing to obtain the single-component solvent-free polyurethane coating. The single-component solvent-free polyurethane coating has the advantages of being low in viscosity and VOC content and high in bonding strength.

Description

technical field [0001] The application relates to the technical field of coatings, more specifically, it relates to a one-component solvent-free polyurethane coating and a preparation method thereof. Background technique [0002] Polyurethane waterproof coating has been widely recognized and applied in the building waterproof industry at home and abroad because of its high strength, good extensibility and corrosion resistance, and its output has also increased year by year. Among them, polyurethane waterproof coatings can be divided into single-component and two-component polyurethane waterproof coatings. Compared with two-component polyurethane waterproof coatings, single-component polyurethane waterproof coatings do not have measurement errors during construction. widely used in recent years. [0003] However, due to the one-component polyurethane waterproof coating, it is not easy to achieve the performance of the two-component polyurethane waterproof coating in terms of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D7/61C08G18/66C08G18/48C08G18/42C08G18/08C08G63/52C08G63/48C08G63/672
CPCC09D175/14C09D7/61C08G18/6681C08G18/48C08G18/4288C08G18/4018C08G18/088C08G63/52C08G63/48C08G63/672C08K2003/265C08K3/34C08K3/26
Inventor 周忠良李海刚宗正新
Owner SHANGHAI ZHENGOU IND
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