Coating material for electrostatic spraying on polypropylene automobile bumper bar

Abstract

The invention discloses a coating material for electrostatic spraying on a polypropylene automobile bumper bar. The coating material is prepared from 8-15 parts by weight of polyurethane resin ester, 10-20 parts by weight of polyester resin, 18-28 parts by weight of modified functional resin, 5-10 parts by weight of ethyl acetate, 5-10 parts by weight of butyl acetate, 0.5-2 parts by weight of an auxiliary agent, 5-10 parts by weight of acrylic resin, 0.5-2 parts by weight of a resistance regulator and 30-40 parts by weight of colorant paste. The preparation method comprises the following steps: a. adding the polyurethane resin ester, the polyester resin, the modified functional resin, the ethyl acetate, the butyl acetate, the auxiliary agent, the acrylic resin and the resistance adjusting agent into a blending kettle and carrying out uniform stirring, b. according to the color of the automobile coating, adding 80-95% of the corresponding colorant paste into the above mixture, carrying out stirring, detecting the color of the coating film, and according to color difference, continuously adding different colorant paste to adjust the color so that the coating film color satisfies the standard, and c. carrying out detection, and when the coating film is qualified, carrying out filtration and packaging.

Description

technical field [0001] The invention relates to a paint for automobile bumpers, in particular to a paint for electrostatically spraying polypropylene material car bumpers, and also to a method for preparing the paint. Background technique [0002] Automobile bumper is an important safety part of the automobile. It is responsible for absorbing and mitigating external impacts to protect the safety of the body and the person. It must have strong flexibility. At present, most automobile bumpers are made of polypropylene material, and then the paint is sprayed by robotic wire body electrostatic spraying method. The utilization rate of robot electrostatic spraying paint is more than 30% higher than that of traditional air spraying, and the paint utilization rate reaches more than 80%, which reduces energy consumption, and the electrostatic spraying efficiency of robot lines is high, which can meet the requirements of high-efficiency production capacity. Large-scale automobile manu...

AI Technical Summary

Problems solved by technology

[0003] However, the coatings in the prior art cannot meet the requirements that the bumper paint surface must have good weather resistance, durability, flexibility, impact resistance, sun resistance, water washing resistance and decorative properties at the same time.

For example, some water resistance is not good, after 120 hours of manual washing with 5% washing solvent, the gloss and color of the coating film will be significantly reduced; some weather resistance is poor, after 2000 hours of artificial accelerated aging, or after professional drying field testing, the gloss will be lost High rate, serious fading, or unqualified water resistance, heat and humidity resistance, poor gasoline resistance, chemical resistance; Decorative parts do not match the main body; some have poor flexibility, are prone to bending and cracking at low temperatures, and are prone to splashing when stones collide; etc.

In particular, most of the existing coatings cannot meet the requirements of electrostatic spraying of robot wires

The main reason is that the paint has poor adaptability to the equipment in robot spraying, so it is easy to cause equipment failure or poor paint film effect after spraying, which cannot meet the requirements of electrostatic spraying by robots on the assembly line of automobile factories, so it cannot meet the needs of modern automobile production