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A kind of water-based heat-resistant polyurethane resin and preparation method thereof

A technology of polyurethane resin and water-soluble polyurethane, applied in the field of water-based heat-resistant polyurethane resin and its preparation, can solve the problems of loss of protection performance, poor heat resistance and water resistance of coating film, poor water resistance, etc., achieve excellent water dispersibility, improve Excellent heat resistance grade and water resistance

Active Publication Date: 2015-08-19
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyurethane resin also has its own inherent disadvantages, that is, low softening point, and it is easy to soften and deform when the temperature is higher than 120°C, and the urethane bond in the resin structure is easy to hydrolyze, making the overall paint film easy to damage and lose its protective performance. The heat resistance and water resistance of the film are poor, while waterborne polyurethane is a dispersion system formed by dispersing polyurethane resin in water
In order to improve the dispersion stability of the resin, in general, the resin structure needs to contain a sufficient amount of hydrophilic groups, such as carboxyl, sulfonic acid, amine, etc., so its performance in water resistance is worse
Although polyurethane resin has been used very well in some common fields, its shortcomings of insufficient heat resistance and water resistance limit its application range and also affect the promotion of waterborne polyurethane

Method used

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  • A kind of water-based heat-resistant polyurethane resin and preparation method thereof
  • A kind of water-based heat-resistant polyurethane resin and preparation method thereof
  • A kind of water-based heat-resistant polyurethane resin and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1～2）

[0028] The water-soluble polyurethane prepolymer of the present invention is composed of 5-20wt% hydrophilic hydroxyl-containing monomer, 20-40wt% polyisocyanate, 5-20wt% glycol and 30-60wt% hydrophilic solvent. 50 ~ 100 ℃, formed by polyaddition reaction, the sum of the weight percentages of the above components is 100%;

Embodiment 1

[0030] ① Prepare the raw materials according to the ratio in Table 1

[0031] Table 1

[0032]

[0033] ②Preparation process

[0034]Add the above-mentioned raw materials into the reaction container, stir and slowly raise the temperature to 90°C, keep the temperature for 3 hours, test the residual NCO content until the residual NCO content is ≤0.1wt%, and cool down to room temperature to obtain a water-soluble polyurethane prepolymer. The number-average molecular weight ranges from 1000 to 8000g / mol, and both ends of the linear molecular chain are hydroxyl groups, which are preserved for future use.

Embodiment 2

[0036] ① Prepare the raw materials according to the ratio in Table 2.

[0037] Table 2

[0038]

[0039] ②Preparation process

[0040] Add the above-mentioned raw materials into the reaction container, stir and slowly raise the temperature to 90°C, keep the temperature for 3 hours, test the residual NCO content until the residual NCO content is ≤0.1wt%, and cool down to room temperature to obtain a water-soluble polyurethane prepolymer. The number-average molecular weight ranges from 1000 to 8000g / mol, and both ends of the linear molecular chain are hydroxyl groups, which are preserved for future use.

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Abstract

The invention relates to water-base heat-resistant polyurethane resin and a preparation method of the same. The resin is an addition polymerization product of polyisocyanates, dihydric alcohol, heat-resistant polyhydric alcohol, hydrophilic solvent and water-soluble polyurethane prepolymer, and is prepared by neutralization, dispersing, chain propagation and solid content regulation; according to percentage by weight, dosage of each constituent is shown as follows: 1-40% of polyisocyanates, 1-30% of dihydric alcohol, 1-10% of heat-resistant polyhydric alcohol, 1-30% of hydrophilic solvent, and 1-15% of water-soluble polyurethane prepolymer; the water-soluble polyurethane prepolymer is prepared from 5-20wt% of hydrophilic hydroxyl-containing monomer, 20-40wt% of polyisocyanates, 5-20wt% of dihydric alcohol and 30-60wt% of hydrophilic solvent through the addition polymerization under the condition of 50-100 DEG C. For the resin provided by the invention, weight loss at 200 DEG C is not more than 3wt%, and the paint film is unchanged after the resin is dipped for 168 hours at 25 DEG C, so that the application range of the water-base polyurethane resin is expanded.

Description

technical field [0001] The invention relates to a water-based heat-resistant polyurethane resin and a preparation method thereof. The resin is especially suitable for use in places with a temperature of 150°C to 230°C and where there may be water vapor. Background technique [0002] Polyurethane resin has excellent acid resistance, alkali resistance, wear resistance and adhesion properties, and its application fields are very wide, such as: wood coatings, car repair coatings, anti-corrosion coatings, floor coatings, electronic coatings, special coatings, etc. However, polyurethane resin also has its own inherent disadvantages, that is, low softening point, and it is easy to soften and deform when the temperature is higher than 120°C, and the urethane bond in the resin structure is easy to hydrolyze, making the overall paint film easy to damage and lose its protective performance. The heat resistance and water resistance of the film are poor, and the water-based polyurethane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/12C08G18/34C08G18/32C08G18/66C09D175/04C09D175/06C09D175/08
CPCC08G18/0823C08G18/3829C08G18/6644C08G18/6677C08G18/8019C08G18/8048C09D175/06C09D175/08
Inventor 曹亚成王木立勾运书张玉兴
Owner CHINA NAT OFFSHORE OIL CORP
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