Solvent-borne coating and main agents, hardening agent and preparation method and coating method of coating

Abstract

The invention discloses a solvent-borne coating and main agents, a hardening agent and a preparation method and a coating method of the coating. The solvent-borne coating comprises 20-60 parts by weight of a solid component and 40-80 parts by weight of an organic solvent, wherein the organic solvent comprises 0-35 parts by weight of a low hydrophilic solvent group and 65-100 parts by weight of a highly hydrophilic solvent group, the low hydrophilic solvent group is at least one group of organic solvent groups with water solubility lower than 5 g / 100 mL, and the highly hydrophilic solvent group is at least one group of organic solvent groups with water solubility higher than 8 g / 100 mL. The hydrophilicity of the volatile organic solvent is improved without changing the physical and chemical properties of the coating, so that when the surface of a substrate is coated, the volatile organic gas can be effectively adsorbed by water, thereby reducing the emission of the volatile organic gas.

Description

technical field [0001] The invention relates to a solvent-based paint, in particular to a solvent-based paint with a highly hydrophilic solvent to reduce the emission of volatile organic gases and meet the requirements of environmental protection. Background technique [0002] Due to the high growth of the industry, in order to avoid the recurrence of the previous oil crisis and to meet the increasingly stringent environmental protection requirements, it is necessary to reduce or replace the use of solvents used in coating-related industries in order to produce low-pollution and resource-saving and energy-saving coatings. [0003] Existing paint types are roughly divided into solvent-based paints and water-based paints. The existing solvent-based coatings contain a large amount of volatile organic compounds (Volatile Organic Compounds, VOCs), which makes the baking temperature lower and the time shorter during coating, and the production capacity is relatively increased. Ho...

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Problems solved by technology

[0005] 1. Since water-based coatings use water as a solvent, water vapor will be evaporated to the coating equipment and baking equipment during the coating process. In order to ensure the durability of the equipment and avoid the problem of oxide pollution caused by metal corrosion, coating Equipment and baking equipment must be made of stainless steel, which will inevitably cause a large capital expenditure for the coating industry

[0006] 2. Although the volatility of water-based paint is low, it requires a long baking time, resulting in a decrease in production capacity. At the same time, in order to improve the quality of the painted surface (such as the problem of paint vertical flow), the paint factory needs to install paint heating and parts Preheating the system will inevitably result in substantial capital expenditures for the coating industry

[0008] As far as the surface coating of current plastic components (such as acrylonitrile-butadiene-styrene copolymer (Acrylonitrile-Butadiene-Styrene, ABS), nylon (Nylon) and polypropylene (Polypropylene, PP) etc.) The use of solvent-based coatings for painting is the most common. The main reason is that in the coating operation of plastic components, due to the low-temperature baking process, it can avoid the corrosion of the equipment caused by the evaporation of water vapor on the spraying and baking equipment, so the equipment It does not need to be made of expensive stainless steel, so the cost is reduced. However, the known effective prevention and control methods for VOC volatile gas emissions are not adopted by the general coating industry due to the high cost of installation and operation. Direct emission is adopted.

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