A kind of preparation method of normal temperature self-repairing water-based polyurethane car cover with self-extinguishing effect

Abstract

The invention discloses a method for making a normal-temperature self-repairing water-based polyurethane car covering with a self-extinction effect. First, polycarbonate diol is poured into a reaction container, and polyisocyanate and a catalyst are slowly added to obtain a prepolymer I; Add hydrophilic chain extender and solvent, add small molecule chain extender and crosslinking agent, and react to obtain prepolymer II; pour into high-speed disperser, add neutralizer, add deionized water to disperse and emulsify, and quickly pour into Polyamine post-chain extender diluted with ionized water to obtain polyurethane emulsion. Add defoamer, leveling agent, wetting agent, film-forming aid, and thickener to the disperser, and slowly add water-based polyurethane emulsion to obtain water-based polyurethane car coating emulsion, and the spraying is completed. The car cover of the present invention has a good normal temperature self-repair function, and at the same time provides different gloss levels and excellent weather resistance. After the resin is compounded with additives, it is sprayed on the surface of the car, which can protect the paint surface of the car for a long time. Can be stripped.

Description

technical field [0001] The invention relates to the field of self-repairing materials, in particular to the synthesis of a normal-temperature self-repairing water-based polyurethane emulsion with a self-extinction effect, and also to a preparation method of a self-delustering normal-temperature self-repairing car cover. Background technique [0002] With the improvement of the domestic economic level and the accelerated urban expansion year by year, more and more people choose to buy private cars as a means of travel. By the end of 2017, the number of cars in the country was 217 million. Passenger cars (private cars) reached 170 million, accounting for 91.89% of passenger cars. The huge automobile market has also brought huge business opportunities for automobile clothing. [0003] At present, the car covers on the market mainly use the film method to protect the car. By brushing the pressure-sensitive adhesive on the film materials (PVC, PU and PU) for pasting, the prepare...

AI Technical Summary

Problems solved by technology

However, the car cover can only be used to protect the car paint. When the car has scratches and other problems, the appearance will be damaged, and it cannot provide repair and other functions.

The Chinese patent with publication number CN108059896A discloses a method for preparing high-temperature self-repairing car coverings. The method uses acrylic resin as a matrix and adds microcapsules containing liquid acrylic resin to realize the self-repairing function. However, the microcapsules used in this invention Technology can only achieve a single repair of the same part

The Chinese patent with publication number CN108084861A discloses a protective film with self-repairing and oil-proof function. The protective film is coated with solvent-based polyurethane on the release film, and the ultraviolet blocking pressure-sensitive adhesive is used to realize the pasting function. The method is prepared Although the protective film has a good repair function, a lot of solvents are used in the construction process, which is very unfriendly to the environment

In addition, the current car covering materials are basically transparent and high-gloss protective films, which are glaring under natural light and cannot meet the individual needs of different consumers.