Method for preparing alcohol soluble polyurethane coating

A polyurethane coating, alcohol-soluble technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of uneven thickness, slow evaporation of water, adhesion of dust, etc., and achieve the effect of simple synthesis operation process and good stability

Active Publication Date: 2012-07-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual coating (flow coating or spraying) process, due to slow water volatilization (long drying time) and poor coating environment, the surface of the final coating film may adhere to dust or have uneven thickness, which greatly affects the vision of the glass. Effect
Alcohol-soluble polyurethane not only retains the advantages of environmental friendliness, but also solves the problem that the coating drying time is too long and the coating film is easily polluted by dust during the drying process

Method used

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  • Method for preparing alcohol soluble polyurethane coating
  • Method for preparing alcohol soluble polyurethane coating
  • Method for preparing alcohol soluble polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Synthesis:

[0038] 1. Weigh about 26 g of polytetrahydrofuran ether glycol (PTMEG, molecular weight Mn=1000) and put it into a three-necked flask;

[0039] 2. Put the three-necked bottle into a vacuum drying oven and heat it to 120°C for 2 hours, then weigh 25g accurately after drying to remove moisture;

[0040] 3. Under the protection of nitrogen, add 4.3ml of measured toluene diisocyanate (TDI) and stir at 80°C for 1h;

[0041] 4. Add metered 4g PEG-400 to continue the reaction for about 1h;

[0042] 5. When the reaction system is slightly viscous, add an appropriate amount of ethanol solution to dilute to ensure the stirring, continue the reaction for 1 hour, and obtain the product (sample one, see figure 1) ;

[0043] 6. Slowly pour the product into continuously stirring water to obtain a milky white flocculent precipitate, take out the precipitate and dry it, then dissolve it in ethanol to obtain a transparent solution. Repeat this twice to purify the produc...

Embodiment 2

[0052] Synthesis:

[0053] 1. Weigh about 26 g of polytetrahydrofuran ether glycol (PTMEG, molecular weight Mn=1000) and put it into a three-necked flask;

[0054] 2. Put the three-necked bottle into a vacuum drying oven and heat it to 120°C for 2 hours, then weigh 25g accurately after drying to remove moisture;

[0055] 3. Under nitrogen protection, add 4.3ml of measured toluene diisocyanate (TDI) and stir at 80°C for 1 hour;

[0056] 4. Add 40g PEG-4000 and continue the reaction for about 30 minutes;

[0057] 5. When the reaction system is slightly viscous, add an appropriate amount of ethanol solution to dilute, and continue the reaction for 1 hour to obtain the product (sample 2, see figure 2) ;

[0058] 6. Slowly pour the product into continuously stirring water to obtain a milky white flocculent precipitate, take out the precipitate and dry it, then dissolve it in ethanol to obtain a transparent solution. Repeat this twice to purify the product and remove PEG that h...

Embodiment 3

[0067] Synthesis:

[0068] 1. Weigh about 26 g of polytetrahydrofuran ether glycol (PTMEG, molecular weight Mn=1000) into a three-necked flask.

[0069] 2. Put the three-necked bottle into a vacuum drying oven and heat it to 120°C for 2 hours, then weigh 25g accurately after drying to remove moisture;

[0070] 3. Under nitrogen protection, add 4.3ml of measured toluene diisocyanate (TDI) and stir at 80°C for 1 hour;

[0071] 4. Add 0.67g DMPA, react for half an hour, add 20g PEG-4000, react for about 10min;

[0072] 6. When the reaction system is slightly viscous, add a large amount of ethanol solution to dilute, and continue the reaction for 1 hour to obtain the product (sample three, see Figure 9) ;

[0073] 7. Slowly pour the product into continuously stirring water to obtain a milky white flocculent precipitate, take out the precipitate and dry it, then dissolve it in ethanol to obtain a transparent solution. Repeat this twice to purify the product and remove the unre...

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Abstract

The invention discloses a method for preparing an alcohol soluble polyurethane coating. The method comprises the following steps of: 1) dehydrating polyether or polyester polyhydric alcohol, of which the average molecular weight is 500 to 5,000, and adding polyisocyanate for reaction according to a molar ratio of isocyanic acid radicals contained in the polyisocyanate to hydroxyl radicals containing the polyether or polyester polyhydric alcohol of 1.1-1.4:1 to form a hydroxyl-terminated polyurethane prepolymer; and 2) directly adding the products obtained by the step 1) to a oligomer or polymer of ethylene oxide of which the molecular weight is 100 to 10,000 without separation for blocking reaction, adding proper amount of ethanol to lower the viscosity of the system when the viscosity ofthe system increases as the reaction continues, and after complete reaction, obtaining the transparent alcohol soluble polyurethane coating. The alcohol soluble polyurethane coating has the advantages of simple synthetic operation process, good stability, no toxic solvents, and no pollution to human bodies and environment, and is suitable to be used in places with higher requirements on curing time of a coating layer, visual effect of the coating layer and environmental protection standards.

Description

(1) Technical field [0001] The invention discloses a preparation method of alcohol-soluble polyurethane paint. (2) Background technology [0002] Coating a layer of transparent heat-insulating coating on the glass surface is an important way to realize energy saving of buildings or vehicles. Polyurethane has become an ideal coating matrix resin for glass due to its excellent hardness, abrasion resistance, adhesion, weather resistance, flexibility, heat resistance and excellent transparency. Because water-based polyurethane coatings use water as the dispersion medium (rather than organic solvents), only water volatilizes into the environment during the film-forming process, which meets environmental protection requirements and is easy to construct, so it is very popular. However, in the actual coating (flow coating or spraying) process, due to slow water volatilization (long drying time) and poor coating environment, the surface of the final coating film may adhere to dust o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06C09D175/08C03C17/32
Inventor 冯杰钱欣姚俊玲
Owner ZHEJIANG UNIV OF TECH
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