Modified waterborne polyurethane resin as well as preparation method and application thereof

A water-based polyurethane and polyurethane resin technology, applied in the field of wood paint coatings, can solve the problems of difficulty in preparing small particle size transparent emulsion, unable to meet the performance requirements of wood paint, and difficult for customers to meet performance requirements, and achieve excellent adhesion effect, High construction efficiency and good thickness

Active Publication Date: 2021-01-05
WANHUA CHEMICAL (NINGBO) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent application CN108623751A discloses a preparation method of acrylate-modified water-based polyurethane for water-based wood lacquers. The sulfonate is used as the hydrophilic center. The sulfonate is a strong acid and strong alkali salt with a high degree of ionization. A very small amount can provide strong hydrophilicity, but its characteristic is that it is difficult to prepare small particle size penetrating emulsion. It is difficult for customers who have wet film penetration requirements for wood paint to meet their performance requirements. It has a certain application limitation
[0004] Chinese patent application CN106279620A discloses a modified waterborne polyurethane resin for wood lacquers and its preparation method, which describes a coating film with fast drying speed, glossiness above 90°, high pencil hardness and excellent water resistance However, due to the ethanol-soluble properties of castor oil in the formula system, its chemical resistance and alcohol resistance are poor, which cannot meet the chemical resistance requirements of high-end wood lacquers.
The modified water-based polyurethane and its modified monomer acrylate are widely used in the field of wood coatings due to their performance advantages and price advantages. However, pure acrylic resins have the characteristics of low fullness, poor indentation resistance, and poor film-forming properties. Can not meet the performance requirements of wood coatings
However, the traditional water-based polyurethane resin cannot meet the performance requirements of wood lacquers due to its low hardness, slow drying speed and poor resistance.

Method used

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  • Modified waterborne polyurethane resin as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Add 72g HMDI (dicyclohexylmethane diisocyanate), 100g PTMEG1000 (polytetrahydrofuran ether glycol), 0.06g8108 catalyst, heat up to 80°C for 1h, cool down to below 60°C, add 5.4g trimethylolpropane, 14.6g dimethylolpropane Propionic acid, 1.2g of 1,4-butanediol, and 58g of acetone were heated to 75°C for reaction. Samples were taken every 1 hour to measure NCO until the NCO reached the theoretical value and the reaction was stopped.

[0101] Cool down to below 60°C (between 50-60°C), add 130g acetone, 11.6g tetrahydrofuran acrylate, 23.2g 3-amino-4,4,4-trifluorobutenoic acid ethyl ester, 46.4g styrene, 150.8g Methyl methacrylate, mix to dissolve.

[0102] Lower the temperature to below 40°C and add 11g of triethylamine, and time the reaction for 5 minutes.

[0103] The prepared prepolymer was poured into a dispersion cup, and 638 g of water was added under a high-speed shear condition of 1500 r / min to obtain a water-based polyurethane-acrylate mixed emulsion. Then 2....

Embodiment 2

[0107] Add 86g HMDI (dicyclohexylmethane diisocyanate), 100g PPG2000 (polypropylene oxide ether glycol), 0.06g8108 catalyst, heat up to 80°C for 1h, cool down to below 60°C, add 6g trimethylolpropane, 16g dimethylol Propionic acid, 2g 1,4-butanediol, 60g acetone, heat up to 75°C for reaction, take samples every 1h to measure NCO, until NCO reaches the theoretical value, stop the reaction.

[0108] Cool down to below 60°C (between 50-60°C), add 134g acetone, 12.5g tetrahydrofuran acrylate, 25g 3-amino-4,4,4-trifluorobutenoic acid ethyl ester, 50.4g styrene, 164.1g formazan methyl acrylate, mix to dissolve.

[0109] Cool down to below 40°C and add 12.06g of triethylamine to neutralize for 5 minutes.

[0110] The prepared prepolymer was poured into a dispersion cup, and 693g of water was added under the condition of high shear of 1500r / min to obtain a water-based polyurethane-acrylate mixed emulsion, and then 2.8g of ethylenediamine was added for chain extension reaction.

[...

Embodiment 3

[0114] Add 86g HMDI (dicyclohexylmethane diisocyanate), 100g PTMEG2000 (polytetrahydrofuran ether glycol), 0.06g8108 catalyst, heat up to 80°C for 1h, cool down to below 60°C, add 6g trimethylolpropane, 16g dimethylolpropionic acid , 2g 1,4-butanediol, 60g acetone, heat up to 75°C to react, take samples every 1h to measure NCO, until NCO reaches the theoretical value, stop the reaction.

[0115] Cool down to below 60°C (between 50-60°C), add 134g acetone, 14.7g tetrahydrofuran acrylate, 29.4g 3-amino-4,4,4-trifluorobutenoic acid ethyl ester, 58.8g styrene, 186.1g Methyl methacrylate, mix to dissolve.

[0116] Cool down to below 40°C and add 12.06g of triethylamine to neutralize for 5 minutes.

[0117] The prepared prepolymer was poured into a dispersing cup, and 753 g of water was added under a high-speed shear condition of 1500 r / min to obtain a water-based polyurethane-acrylate mixed emulsion, and then 2.8 g of ethylenediamine was added for chain extension reaction.

[0...

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Abstract

The invention provides modified waterborne polyurethane resin as well as a preparation method and an application thereof. The resin is prepared by reaction of an isocyanate-terminated prepolymer and amodified monomer. The preparation method comprises the following steps of: synthesizing the isocyanate-terminated prepolymer, fully mixing and dissolving a monomer with a modification function and the isocyanate-terminated prepolymer, dispersing under high-speed shearing to obtain a pre-modified emulsion after neutralization reaction, and adding an initiator into the pre-modified emulsion to initiate polymerization. The polyurethane resin provided by the invention can be used in the field of paint, especially wood lacquer, the preparation process of the modified waterborne polyurethane resinprepared by the preparation method provided by the invention is simple and controllable, the synthesized resin has high solid content and small particle size, and the application performance requirements in the field of wood lacquer are met.

Description

technical field [0001] The invention belongs to the field of wood lacquer coatings, in particular to a modified waterborne polyurethane resin, its preparation method and application. Background technique [0002] In recent years, under the constraints of increasingly strict environmental protection laws in various countries, the market share of water-based wood coatings has increased year by year. At present, the usage rate of water-based wood coatings in Germany has reached 70%, and that of the United States has reached 80%. The annual output is increasing at a rate of 9%. . However, the application performance of wood lacquer coatings needs to be improved. Compared with solvent-based coatings, its hardness is lower, and its adhesion to primers is poor. The effect of sealing primers alone is poor, the fullness is poor, the early anti-adhesion is poor, and the anti-staining ability Poor etc and overpriced. Therefore, it is necessary to develop a wood paint resin with high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/34C08G18/32C08G18/12C08F283/00C08F220/34C08F212/08C08F220/14C08F220/28C09D175/08C09D151/08
CPCC08G18/12C08G18/6692C08G18/4825C08G18/6685C08G18/6677C08G18/6674C08G18/4854C08G18/3206C08G18/348C08F283/006C09D175/08C09D151/08C08G18/3228C08F220/34C08F212/08C08F220/14
Inventor 胡海东孙常青周操张洁纪学顺刘姗韩克
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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