Production method of room-temperature self-repairing type waterborne polyurethane car cover with self-extinction effect

Abstract

The invention discloses a production method of a room-temperature self-repairing type waterborne polyurethane car cover with a self-extinction effect. The production method comprises the following steps: firstly, pouring polycarbonate diol into a reaction container; slowly adding polyisocyanate and a catalyst to obtain a pre-polymer I; adding a hydrophilic chain-extending agent and a solvent; adding a small molecular chain-extending agent and a crosslinking agent and reacting to obtain a pre-polymer II; pouring into a high-speed dispersion device and adding a neutralizing agent; adding de-ionized water and dispersing and emulsifying; rapidly pouring a polyamine chain-extending agent diluted by the de-ionized water to obtain polyurethane emulsion; adding a de-foaming agent, a leveling agent, a wetting agent, a film-forming auxiliary agent and a thickening agent into a dispersion device; slowly adding the waterborne polyurethane emulsion to obtain waterborne polyurethane car cover emulsion and finishing spray coating. The car cover provided by the invention has a good room-temperature self-repairing function and also provides different glossiness and excellent weather resistance; after resin is compounded with the auxiliary agent, a mixture is sprayed on the surface of a car; a paint surface of the car can be protected for a long time and can be stripped at any time.

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.