Method for preparing high-temperature baking type water-soluble damping coating for vehicles

Abstract

The invention discloses a method for preparing high-temperature baking type water-soluble damping coating for vehicles. The method comprises the following steps: (1) numbering water-soluble acrylic resin emulsions having a glass-transition temperature of negative 10 DEG C, 0 DEG C, 20 DEG C and 50 DEG C respectively to be emulsion No.1, emulsion No.2, emulsion No.3 and emulsion No.4 in a weight ratio of (0.5-1):(1-1.5):(1.5-2.5):(0.5-1), wherein the emulsions account for 20-45 percent of the weight of the coating; (2) selecting wollastonite powder, mica powder and ground calcium carbonate in a weight ratio of (0.5-1):(2-3):(1.5-2.5) as functional packing, wherein the functional packing accounts for 50-65 percent of the weight of the coating; and (3) adding water into a reaction kettle, adding the following materials in percentage by weight: 0.2-0.5 percent of dispersant, 0.2-0.5 percent of a wetting agent, 0.2-0.5 percent of a defoaming agent, 0.2-0.5 percent of a bactericide, 0.2-0.5 percent of coalescing agent and 0.2-0.5 percent of color paste, stirring for 10-15 minutes, adding the emulsions, and keeping on stirring for 15-20 minutes, adding the functional packing, stirring and dispersing for 20-25 minutes, adding 0.1-0.4 percent of thickener to regulate the viscosity. The coating can be cured when being baked at 140 DEG C for 15-20 minutes, can be applied to the assembly line of a vehicle maker, and has good damping performance, weather resistance, adhesive force and environmental friendliness.

Description

Technical field [0001] The invention belongs to the technical field of resin-based composite materials, and specifically relates to a method for preparing a high-temperature baking type water-based damping paint for automobiles. Background technique [0002] When a car is running, its vibration and noise will seriously affect the comfort of the drivers and passengers. Therefore, a large area of ​​damping materials must be applied to the car body to reduce the vibration and noise of the car. The damping materials for automobiles mainly include damping plates and damping coatings. At present, the most widely used bituminous damping plate in China has the advantages of lower cost and good damping effect; but its disadvantages are also many, such as manual construction, easy to fall off, heavy products, unenvironmental protection, etc., the current automotive noise reduction materials The development trend is environmental protection and light weight. Due to the advantages of low VOC...

AI Technical Summary

Problems solved by technology

[0002] During the driving process of the car, its vibration and noise will seriously affect the ride comfort of the drivers and passengers. Therefore, it is necessary to apply damping materials on a large area of ​​the car body to reduce the vibration and noise of the car. The damping materials for cars mainly include damping plates and damping coatings. At present, the asphalt damping plate is widely used in China. Its advantages are low cost and good damping effect; The development trend is environmental protection and light weight. Due to the advantages of low VOC emissions and low dry film density, water-based damping coatings will replace asphalt damping panels and be used by major OEMs