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

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. ...

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