Preparation method of strippable waterborne polyurethane resin and application thereof in coating

A water-based polyurethane and resin technology, applied in polyurea/polyurethane coatings, coatings, etc., to achieve good stability, strong adhesion, and simple synthesis steps

Active Publication Date: 2019-11-22
青岛水性七彩新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing patent CN102010650A discloses a water-based polyurethane coating, which specifically discloses 50-80 parts of polypropylene carbonate polyol, 10-30 parts of polyisocyanate, 3-8 parts of hydrophilic chain extender, and 1-8 parts of crosslinking agent. 4 parts, 170-270 parts of deionized water, the invention also discloses the preparation method of the water-based polyurethane coating; but the coating in the invention needs to reach a certain thickness when forming a film to achieve the corresponding technical effect

Method used

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  • Preparation method of strippable waterborne polyurethane resin and application thereof in coating
  • Preparation method of strippable waterborne polyurethane resin and application thereof in coating
  • Preparation method of strippable waterborne polyurethane resin and application thereof in coating

Examples

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Effect test

Embodiment 1

[0033] A preparation method of peelable water-based polyurethane resin, comprising the following steps:

[0034] In parts by weight, 30 parts of polypropylene carbonate diol with a molecular weight of 2500, 15 parts of isophorone diisocyanate, 1 part of trimethylolpropane and 0.1 part of organic bismuth catalyst are mixed at 70-90°C React at low temperature for 2-4 hours; add 3 parts of 1,4-butanediol and 30 parts of acetone, and react at 60-70°C for 2-6 hours; cool down to 35-60°C, add 1 part of triethylamine, and stir for 10- After 20 minutes, quickly add 220 g of deionized water for high-speed emulsification, and stir for 10-20 minutes; put the obtained product on a rotary evaporator, reduce the pressure under vacuum, and remove the solvent to obtain a peelable water-based polyurethane resin.

[0035] Add 150 parts of the water-based polyurethane resin prepared above, 1 part of pullulan, 0.05 parts of leveling agent Tech 233A, 2 parts of water-based color paste, and 0.02 pa...

Embodiment 2

[0038] A preparation method of peelable water-based polyurethane resin, comprising the following steps:

[0039] In parts by weight, 20 parts of polypropylene carbonate diol with a molecular weight of 2000, 12 parts of polytetrahydrofuran ether diol with a molecular weight of 2000, 10 parts of toluene diisocyanate, 1 part of trimethylolpropane and 0.2 Parts of organic bismuth catalyst react at 70-90°C for 2-4 hours, add 2 parts of 1,6-butanediol and 40 parts of acetone, react at 60-70°C for 2-6 hours, cool down to 35-60°C and add 1 part of triethylamine, stirred for 10-20 minutes, quickly added 225g of deionized water for high-speed emulsification, stirred for 10-20 minutes; put the obtained product on a rotary evaporator, vacuum decompressed, and removed the solvent to obtain a strippable water-based polyurethane resin .

[0040]Add 150 parts of the water-based polyurethane resin prepared above, 1.5 parts of pullulan, 0.05 parts of leveling agent Tech233A, 2 parts of water-b...

Embodiment 3

[0043] A preparation method of peelable water-based polyurethane resin, comprising the following steps:

[0044] In parts by weight, 35 parts of polypropylene carbonate diols with a molecular weight of 2000, 10 parts of toluene diisocyanate and 15 parts of isophorone diisocyanate, 1 part of trimethylolpropane, and 0.2 parts of organic bismuth The catalyst is reacted at 70-90°C for 2-4 hours, add 3 parts of neopentyl glycol and 35 parts of acetone, react at 60-70°C for 2-6 hours, cool down to 35-60°C, add 1 part of triethylamine, and stir After 10-20 minutes, quickly add 225g of deionized water for high-speed emulsification, and stir for 10-20 minutes; put the obtained product on a rotary evaporator, reduce the pressure under vacuum, and remove the solvent to obtain a peelable water-based polyurethane resin.

[0045] Add 150 parts of the water-based polyurethane resin prepared above, 2 parts of pullulan polysaccharide, 0.05 parts of leveling agent Tech 233A, 2 parts of water-ba...

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Abstract

The invention provides a preparation method of strippable waterborne polyurethane resin and application thereof in coating. The preparation method comprises the following steps: uniformly stirring andmixing 10-40 parts of polypropylene carbonate polyol, 20-40 parts of isocyanate and 0.5-6 parts of a hydrophilic agent, and then adding 0.1-0.2 part of a catalyst to obtain a mixed solution A; adding1-5 parts of a chain extender and 20-70 parts of acetone into the mixed solution A obtained in the step 1 to obtain a mixed solution B; cooling the mixed solution B in the step 2 to 35-60 DEG C, adding 0.3-3 parts of triethylamine, adding deionized water, emulsifying the mixture at a high speed, and stirring the mixture for 10-20 minutes to obtain an emulsion; and 4, placing the emulsion obtainedin step 3 on a rotary evaporator, carrying out vacuum pressure reduction concentrating, and removing the solvent to obtain the strippable waterborne polyurethane resin. The resin is mixed with pullulan and the like to obtain the coating. The waterborne strippable coating has biodegradability, does not pollute the environment, can reduce the investment of manpower and financial resources, and hasmore obvious environmental protection advantages compared with traditional films and other strippable resins.

Description

technical field [0001] The invention belongs to the field of water-based coatings, in particular to the synthesis of a strippable water-based polyurethane resin and its application in preparing strippable coatings. Background technique [0002] During the loading, unloading and transportation process of metal, plastic and other parts, they are extremely vulnerable to external erosion such as rainwater, oil stains, bacteria, etc. or artificial scratches, causing unnecessary damage. In order to reduce the risk during transportation and prolong the service life of equipment and parts, a layer of film is usually covered on the surface of the device as a temporary protection, and the protective film is peeled off when the device is used, which will not affect the performance and appearance of the device, and It can reduce equipment loss and is a convenient and efficient protection method. The film used for this temporary protection is usually called a peelable protective film. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/34C08G18/40C08G18/44C08G18/48C08G18/32C08G18/12C09D175/04C09D175/08C09D5/20C09D7/65
CPCC08G18/12C08G18/348C08G18/4018C08G18/44C08G18/4854C08G18/6659C08G18/6692C08L2201/06C09D5/20C09D7/65C09D175/04C09D175/08C08G18/3206C08L5/00
Inventor 不公告发明人
Owner 青岛水性七彩新材料有限公司
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