Stone-hitting resisting automobile middle coating

Abstract

The invention discloses a stone-hitting resisting automobile middle coating which is composed A and B components, A:B is equal to 1:(1.5-8), A component is formed by dissolving polyisocyanate soft resin and high crosslinking polyisocyanate hard resin in solvent, B component is formed by dissolving acrylic resin, titanium pigment, furnace black, talcum powder, dispersing auxiliary, functional resin, anti-sedimentation assistant, leveling agent and drying accelerator in solvent; in the stone-hitting resisting automobile middle coating, by matching more than two different soft and hard polyisocyanate resins which are self-prepared, the automobile middle coating which has good stone-hitting resisting performance and good construction rubbing property is obtained; the two components in the stone-hitting resisting automobile middle coating have good mild water resistance, acid resistance and alkali resistance, the film is flexible and hard and has adhesive force with a bottom layer and good bonding force with a surface layer; the thickness of dry film of the film formed by one step can reach 40-60mum, the leveling property is good, the surface roughness of the middle coating can reach Ra:0.13, DOI (Dorigon) average value of spraying finishing paint rear automobile body is 83-86 and reaches high level.

Description

technical field [0001] The invention relates to an automobile paint in the technical field of paint making, in particular to a two-component automobile intermediate paint with excellent stone chipping resistance. Background technique [0002] As an outdoor means of transportation, automobiles are always likely to be attacked by various wind, sand and hard objects. Especially when driving at high speed, the coating is more likely to be damaged by the impact of hard objects. Therefore, the stone impact resistance of the automobile surface paint film is proposed higher requirements. [0003] In the prior art, it is generally believed that the stone chip resistance of automobile paint films can be adjusted by adding or subtracting various resin contents. The specific method is as follows: [0004] 1. Add 1% to 3% amino resin to the intermediate coating to increase the hardness of the intermediate coating, and see if it can achieve a good anti-stone impact effect. [0005] 2. ...

AI Technical Summary

Problems solved by technology

[0009] The present invention is aimed at the single polycyanate or amino resin cross-linked film in the prior art, the softness and hardness of the coating film is difficult to meet the requirements of the car coating process, it is difficult to meet the requirements of impact resistance, and it is also difficult to meet the requirements of the coating. Insufficient acid resistance, alkali resistance and sanding performance in the construction process required by the coating, and a kind of intermediate coating with excellent stone chipping resistance obtained by combining two or more different soft and hard resins