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A kind of preparation method of waterborne polyamide thixotropic anti-sedimentation agent

A thixotropic anti-settling agent, polyamide technology, applied in coatings and other directions, can solve the problems that coatings cannot be used in water-based systems, transparent coatings are opaque, coating product defects, etc., to balance sag resistance and leveling, Good product quality and excellent thickening effect

Active Publication Date: 2016-07-06
江西省龙海化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unless the required temperature is difficult to control and the process is complex, once the temperature is too high or too low, the finished coating system will produce particles, resulting in coating product defects
As a result, matting and opacity appear in the prepared transparent coatings, and these coatings cannot be used in water-based systems, and the application range is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 20 g of citric acid, 80 g of adipic acid, 62 g of decanediamine, and 50 g of lauryl hydroxystearic acid into a vacuum oven, and dry at 60° C. for 12 hours. Put the dried raw material into a three-necked flask, add 150mL of N-methylpyrrolidone into the flask as a solvent, prepolymerize at 80°C for 1 hour, then raise the temperature to 110°C, add 12mL of triphenyl phosphite, and react for 0.5h. Heat up to 125°C, react for 2 hours, cool down, add 10.3g maleic anhydride and 3g pyridine, stir and heat to 80°C and react for 2 hours to obtain acidified water-based polyamide resin; then add 7g triethanolamine for neutralization, Instant product.

Embodiment 2

[0026] Put 80 g of malic acid, 60 g of isophthalic acid, 39.6 g of hexamethylenediamine, and dimethylol propionic acid into a vacuum oven, and dry at 60° C. for 12 hours. Put the dried raw material into a three-necked flask, add 150mL of N-methylpyrrolidone into the flask as a solvent, pre-polymerize at 70°C for 2 hours, then raise the temperature to 150°C, add 12mL of triphenyl phosphite, and react for 2 hours. After cooling, add 52.1g of phthalic anhydride and 3g of pyridine, stir and heat to 80°C, react for 2 hours, add 20g of ethanolamine to obtain a water-based polyamide thixotropic anti-sedimentation agent.

Embodiment 3

[0028] Put 15 g of malic acid, 60 g of adipic acid, 39 g of 1,7-heptanediamine, and 20 g of dodecyl hydroxystearic acid into a vacuum oven, and dry at 60° C. for 12 hours. Put the dried raw materials into a three-necked flask, add 150mL N-methylpyrrolidone into the flask as a solvent, prepolymerize at 100°C for 1 hour, then raise the temperature to 150°C, add 12mL of phenyl hypophosphorous acid, react for 2 hours, and cool , add 12g of maleic acid and 3g of dimethylaminopyridine, stir and heat to 60°C and react for 2 hours, then add 5g of potassium hydroxide to obtain the water-based polyamide thixotropic anti-sedimentation agent.

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PUM

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Abstract

The invention relates to the field of chemical ink coatings, in particular to a preparation method of a water-based polyamide thixotropic anti-sedimentation agent, comprising the following processing steps: the first step, first copolymerizing a dibasic acid, an organic acid with a hydroxyl group and a diamine, Obtain the hydroxyl-containing copolyamide prepolymer; second step, acidification: carry out the binary copolymerization reaction with the hydroxyl-containing copolyamide prepolymer and the acidulant to obtain the carboxyl-containing polyamide; the third step, the carboxyl-containing The polyamide is neutralized with alkali to obtain a water-based polyamide thixotropic anti-sedimentation agent. The preparation method is simple, the raw material is cheap, and the prepared water-based polyamide has simple process and good product quality. It is mainly used as an anti-settling agent for coatings, which can better balance the anti-sagging and leveling properties of the coating film, and can impart Spear coating system has high thixotropic properties, and has excellent thickening and anti-sedimentation effects, which can effectively prevent the precipitation of pigments and fillers in the coating. It can be widely used in water-based system coatings with a wide range of applications.

Description

technical field [0001] The invention relates to the field of chemical ink coatings, in particular to a preparation method of a water-based polyamide thixotropic anti-sedimentation agent. Background technique [0002] In the prior art, in order to control the rheology of the liquid system, for example, silicon dioxide, hydrogenated castor oil, organically modified bentonite and polyamide wax are generally used. In the field of polyamide and polyamide resin, there are a large number of patents, such as DE69523221, EP0239419, US5510452l and so on. Modified bentonites in combination with polyamides are also used, as described in EP0509202 and DE69704691. [0003] The above technologies are usually powders or pastes, however powders or pastes must be transformed into semi-finished products using solvents and applying shear forces, or introduced into liquid coating systems using special temperature control. Unless the required temperature is difficult to control and the process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/48C09D7/02C09D7/45
Inventor 董清龙巴于磊
Owner 江西省龙海化工有限公司