Water-based paint in-can preservative

Abstract

The invention provides an application of a compound shown in a formula I in a water-based in-can preservative, and the novel water-based in-can preservative, which is prepared by taking the compound shown in the formula I as an active component and adding a solvent. The preservative has the advantages of being environmentally friendly, long in stable storage time, good in compatibility with a conventional water-based paint system, wide in pH value application range, free of ionization in a solvent system, excellent in inactivation capacity for common microorganisms in the water-based paint, free of generation of formaldehyde gas, capable of being ecologically decomposed after being used and the like. The basic requirements of green paint are met, and the product is suitable for industrial application.

Description

technical field [0001] The invention belongs to the field of water-based paint additives, in particular to an antiseptic in a water-based paint tank. Background technique [0002] Water-based coatings are susceptible to microbial contamination during production and storage. Once contaminated, microorganisms will grow rapidly, their secretions will increase rapidly, and the quality of the coating will be damaged, which will cause the coating to bulge, stink, and flocculate. The in-can anticorrosion of water-based coatings by adding effective preservatives has been a common method in the industry for a long time. [0003] Additives added to water-based coatings often contain nutrients needed by microorganisms. The system is thick and viscous, and contains various inorganic substances, organic substances, and polymers. It is very difficult to prevent corrosion in the tank, and it has always been the largest in the water-based coatings industry. One of the pain points. Combine...

AI Technical Summary

Problems solved by technology

According to the "GB / T 35602-2017 "Green Product Evaluation Coatings"" standard, the above materials have been included in the scope of restricted use

In addition, several types of isothiazolinone substances (including Cathone system CMIT / MIT) have been proven to have the following shortcomings and defects: BIT has gaps in the antibacterial spectrum line, has a general effect on fungi, and its bactericidal speed is also slow; MIT / BIT has weak bactericidal ability, which is not good for anti-corrosion, and its bactericidal ability is not as good as CMIT / MIT

[0015] However, cationic materials, including quaternary ammonium salt systems, polymerized guanidine systems, imidazolium salts, etc., have two major problems: 1) The ability to inhibit and inactivate conventional bacteria is good, but the ability to inhibit fungi / mold Weak, it is difficult to meet the microbial inactivation rate mentioned in the "GBT 30792-2014" standard, and there are hidden dangers of pollution; 2) Based on the combination characteristics of cations and anions, cationic preservatives will directly generate electrostatic bonds with the components of the coating system, resulting in The flocculation phenomenon of paint will destroy the quality of the paint itself, so there are strict restrictions on the choice of paint system

[0018] However, although inorganic antibacterial preservatives have their advantages in anti-mildew and anti-algae, they have obvious shortcomings in the anti-corrosion of water-based coatings: 1) The ability to inhibit and kill fungi is insufficient, such as silver-based, copper-based, zinc-based, etc. Material; 2) Easy to change color, which affects the color of the paint; 3) Inorganic nano powder materials have weak diffusion ability and weak anti-corrosion effect, and it is difficult to meet the standard requirements. Compatibility with the coating system is more difficult to guarantee; 4) Some of them involve metal preservatives, and there are also problems of high cost and environmental accumulation toxicity, such as silver-based materials

However, the current chlorine-containing preservatives exist at the same time: they have poor stability and are not easy to preserve; they can interact with organic matter and polymers, decompose organic matter, and degrade polymers to affect the performance of water-based coating systems. Some chlorine-containing substances have unfriendly tastes; In addition, it is greatly affected by the pH value. For example, 1,3-dichloro-5,5-dimethylhydantoin (DCDMH) can be rapidly decomposed when the pH value is about 9.

[0020] To sum up, all currently reported antibacterial and antiseptic systems, biocidal compositions, microbial inactivation systems, etc. basically adopt a combination method, and achieve synergy by controlling each component. The main problems are: large aquatic hazards, Not environmentally friendly; weak anti-corrosion performance, difficult to meet the standard requirements; many use restrictions, difficult to control the compatibility with the paint itself, high requirements for the selection of water-based paint raw materials; poor storage stability, inconvenient use, and unfriendly smell; extremely It is easy to decompose, and the action period is extremely short; the composition is too complex, and the impact on the quality of the coating is uncontrollable, etc.

Images