Non-ionic reaction type water-based paint hyperdispersant and preparation method thereof

A non-ionic reactive, water-based coating technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve the problems of low metal substrate adhesion, insufficient salt spray resistance, poor long-term stability, etc., to achieve enhanced surface moisturization Wet, increase the crosslink density, improve the effect of water resistance

Active Publication Date: 2022-04-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersion state of pigments and fillers in water-based coatings directly determines the performance of water-based coatings, and the role of dispersants is to evenly disperse the solid pigments and fillers in the coatings in the water-based system. There are many types of water-based coating dispersants. Traditional Low-molecular-weight dispersants include anionic, cationic, electrically neutral, and non-ionic types, but low-molecular-weight dispersants have disadvantages such as weak adsorption on the surface of solid pigments and fillers, and poor long-term stability of the system.
[0003] Polymer dispersant, also known as hyperdispersant, on the one hand, its molecular chain skeleton contains multiple anchoring groups, which have a strong adsorption effect on solid pigments and fillers , on the other hand, its hydrophilic chain extends into the water, prevents the aggregation of particles through electrostatic repulsion or steric hindrance, and maintains the uniform and stable dispersion of pigments and fillers. For example, patent 201810525247.3 discloses a polyurethane-based non-ionic water-based coating hyperdispersant and its preparation method, 202010429012.1 discloses a polymer dispersant that can be used in coatings and its preparation method, but the current hyperdispersants do not have the ability to react with film-forming substances, and the cured water-based coating still has poor water resistance, Insufficient salt spray resistance and low adhesion to metal substrates

Method used

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  • Non-ionic reaction type water-based paint hyperdispersant and preparation method thereof
  • Non-ionic reaction type water-based paint hyperdispersant and preparation method thereof
  • Non-ionic reaction type water-based paint hyperdispersant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Mix 1 mol of dehydrated oleic acid polyoxyethylene ether with 3000 ml of dioxane solvent, add 2 g of boron trifluoride etherate complex, and add 1 mol of bisphenol F epoxy resin with stirring at 55 ° C. (referring to the amount of the substance containing the structural unit of the bisepoxide group in the bisphenol F epoxy resin), the reaction temperature was controlled at 110° C., and the reaction was carried out for 50 minutes to obtain the intermediate 1.

[0038] (2) Add 0.35 mol of glutaric acid and 0.05 mol of p-toluenesulfonic acid to the product of step (1), and react at 150°C for 120 min to obtain a mixture 2 including intermediate 2 and intermediate 1.

[0039](3) Add 0.05mol benzyl alcohol and 0.1mol ethylene glycol to mixture 2, react at 120°C for 30min, remove the solvent by rotary evaporation, add deionized water according to the solid content of 40% after cooling down, and cool and discharge to obtain 40% solid content Hyperdispersant products.

[00...

Embodiment 2

[0042] (1) Mix 1 mol of dehydrated castor oil-based polyoxyethylene ether with 3000 ml of xylene solvent, add 2 g of boron trifluoride etherate complex, and add 1.2 mol of bisphenol A epoxy resin with stirring at 55° C. (Referring to the amount of the substance containing the structural unit of the bisepoxide group in the bisphenol A epoxy resin), the reaction temperature is controlled at 40° C., and the reaction is carried out for 120 minutes to obtain the intermediate 1.

[0043] (2) Add 0.4 mol of adipic acid and 0.05 mol of p-toluenesulfonic acid to the product of step (1), and react at 100°C for 60 minutes to obtain a mixture 2 including intermediate 2 and intermediate 1.

[0044] (3) Add 0.1mol benzyl alcohol to the mixture 2, react at 80°C for 120min, remove the solvent by rotary evaporation, add deionized water according to the solid content of 15% after cooling down, and cool and discharge to obtain a hyperdispersant product with a solid content of 15%.

Embodiment 3

[0046] (1) Mix 1mol of dehydrated polyoxyethylene lauryl ether with 3000ml of ethyl acetate solvent, add 2g of triphenylphosphine, and add 1,4-butanediol diglycidyl ether while stirring at 55°C 0.8mol, the reaction temperature was controlled at 60°C, and the reaction was carried out for 30 minutes to obtain intermediate 1.

[0047] (2) Add 0.36 mol of phthalic acid and 0.05 mol of p-toluenesulfonic acid to the product of step (1), and react at 180°C for 30 minutes to obtain a mixture 2 including intermediate 2 and intermediate 1.

[0048] (3) Add 0.05mol isooctyl alcohol to the mixture 2, react at 100°C for 150min, remove the solvent by rotary evaporation, add deionized water according to 90% solid content after cooling down, and cool and discharge to obtain a hyperdispersant product with 90% solid content.

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Abstract

The invention relates to the technical field of water-based paint, in particular to a nonionic reaction type water-based paint hyperdispersant and a preparation method thereof.The preparation method comprises the following steps that 1, in the presence of a solvent and a catalyst, a binary epoxy compound reacts with mono-substituent polyoxyethylene ether to prepare an intermediate 1; 2, reacting the intermediate 1 obtained in the step 1 with a dicarboxylic acid compound in a solvent to prepare a mixture 2; 3, the mixture 2 obtained in the step 2 reacts with a unit or polyol compound in a solvent under the action of a catalyst, the solvent is distilled out after the reaction, quantitative deionized water is added according to the designed solid content after cooling, cooling and discharging are conducted, and the non-ionic reaction type water-based paint hyperdispersant is obtained. The hyperdispersant prepared by the preparation method disclosed by the invention not only can stably and uniformly disperse solid pigments and fillers in a coating, but also can improve the water resistance and salt spray resistance of a water-based coating and the adhesion performance of the water-based coating to a metal base material.

Description

technical field [0001] The invention relates to the technical field of water-based paint, in particular to a non-ionic reactive water-based paint hyperdispersant and a preparation method thereof. Background technique [0002] With the restrictions on volatile organic compounds in the national environmental protection policy, water-based coatings have received widespread attention and rapid development. Water-based coatings are generally composed of film-forming substances, solvents (water), pigments and fillers, and additives. Additives include thickeners, leveling agents, defoamers, dispersants, wetting agents, etc., which account for a small proportion of the entire coating ratio, but play a vital role. The dispersion state of pigments and fillers in water-based coatings directly determines the performance of water-based coatings, and the role of dispersants is to evenly disperse the solid pigments and fillers in the coatings in the water-based system. There are many type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/332C08G65/331C08G65/28C09D7/65C09D163/00
Inventor 杨延格王家良曹京宜王兴奇李亮方志刚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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