Universal low-VOC (volatile organic compound) electrophoresis-free water-based primer for bicycles

Abstract

The invention discloses universal low-VOC (volatile organic compound) electrophoresis-free water-based primer for bicycles. The primer is prepared from water-based resin and an auxiliary agent, wherein water-based resin is prepared from, by weight, 23-25% of water dispersed acrylic polyester emulsion, 8-10% of water-based epoxy emulsion and 6-8% of water-based amino resin; the auxiliary agent is prepared from, by weight, 0.6-0.8% of an adhesion promoter, 2-4% of an environment-friendly solvent, 0.1-0.2% of a neutralizing agent, 0.6-0.8% of a wetting dispersant, 18-22% of titanium dioxide, 4-6% of precipitated barium sulfate, 0.3-0.5% of an anti-settling agent, 4-6% of mica powder, 0.4-0.6% of an antifoaming agent, 0.4-0.6% of a leveling agent, 0.3-0.5% of a substrate wetting agent, 0.6-0.8% of catalysts, 18-25% of deionized water and 1-2% of a thickening agent. The universal low-VOC electrophoresis-free water-based primer for bicycles is provided.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a low-VOC electrophoresis-free water-based universal primer for bicycles. Background technique [0002] Bicycle market overview: In October 2014, the national output of two-wheeled bicycles was 5.3 million. From January to October 2014, the national production of two-wheeled bicycles was 52 million, a year-on-year increase of -5.53% compared with 2013. Electric vehicle market overview: In 2014, the national electric bicycle industry produced a total of 26 million units, a year-on-year increase of 18.38%. In 2015, the production capacity reached 31 million vehicles. According to the above information, the production volume of bicycles and electric bicycles reached 89 million in 2015. Several major production bases have formed in the existing bicycle market, among which Tianjin accounts for 38.25%, Zhejiang accounts for 23.38%, Guangdong accounts for 15.96%, Jiangsu accounts for 14.46%, ...

AI Technical Summary

Problems solved by technology

[0004] 1. The existing bicycle primer is mainly solvent-based, which needs to solve the problems of high VOC content, serious pollution, flammability and explosion;

[0005] 2. The existing water-based bicycle primer has the problems of poor flexibility of the coating after three layers of baking, and decreased adhesion on different substrates and electrophoretic paint surfaces;

[0006] 3. The existing water-based bicycle primers generally use water-soluble acrylic resin or polyester resin amino baking varnish. The VOC is as high as 300g / L or more, and the emission is relatively high. It needs organized and centralized treatment, and the cost is high;

[0007] 4. The existing water-based bicycle primer has poor salt spray resistance, generally within 72 hours, and electrophoretic paint is required to improve the anti-corrosion performance. Some manufacturers’ cast iron substrates will have a great corrosion risk if they do not use electrophoretic paint; existing Water-based bicycle primer has poor versatility. When different substrates are involved, other primers need to be replaced. It is inconvenient to use and supply, especially the low-VOC electrophoresis-free water-based general primer for bicycles is still blank

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