Synthesis method of peelable water-based polyurethane resin for car cover

Abstract

The invention discloses a synthesis method of peelable water-based polyurethane resin for a car cover. The synthesis method comprises the following steps: firstly, adding polytetramethylene ether glycol and polyether-modified organosilicone into a reaction container, performing vacuum dewatering, introducing nitrogen, dropwise adding diisocyanate into the reaction container, and reacting to obtain a prepolymer I; cooling the prepolymer I to 60 DEG C or below, adding dried polyhydroxycarboxylic acid into the reaction container, then dropwise adding dihydric alcohol into the reaction container, and reacting to obtain a hydrophilic group-containing prepolymer II; cooling the prepolymer II to 45 DEG C, dropwise adding diamine into the reaction container, and reacting to obtain a prepolymer III; and adding organic amine into the prepolymer III, neutralizing to form salt, and then adding diamine diluted with deionized water, stirring for 30-60 min, and emulsifying to obtain the peelable water-based polyurethane resin for the car cover, having the solid content of 30-45%. The peelable water-based polyurethane resin for the car cover, prepared by the synthesis method provided by the invention, improves the water resistance and the aging resistance of the car cover on the premise of easy peeling.

Description

technical field [0001] The invention relates to a method for synthesizing a polyurethane resin, in particular to a method for synthesizing a peelable water-based polyurethane resin for car clothing. Background technique [0002] The peelable coating has important use value and artistic value in the automotive industry. After the coating is sprayed on the surface of the object, a transparent film is formed. The film has excellent ductility and super tensile strength, and can be used on any curved surface It shows the characteristics of ideal accompanying performance without affecting the original color of the car paint; it can increase the gloss of the car paint by 5%-20%. This protective film can not only isolate the erosion of external bad factors, but also withstand mechanical collisions and Friction, and when no protection is needed, the paint can be easily peeled off, which is convenient to use. [0003] There are two main types of temporary protection for the surface o...

AI Technical Summary

Problems solved by technology

The advantage of this process is that it is easy to operate and easy to peel off, but there are also certain technical defects, such as: 1. Poor peelability, it is not easy to peel off the whole sheet of irregularly shaped materials, especially the edge of the material is easy to remain; 2. Low efficiency , the amount of consumables is large, which increases the cost of manpower and consumables to the manufacturer.

Second, oil-based peelable coatings, except for some silicone-based peelable coatings, other types of oil-based peelable coatings contain a certain amount of solvents. The volatilization during use not only wastes resources, but also pollutes the atmosphere and pollutes the construction environment. It brings health hazards to those working in the middle, for example: it often contains benzene, formaldehyde and other substances harmful to the human body, and it is very dangerous to use

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