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A kind of waterborne coating resin based on konjac flour, its preparation method and composition

A water-based coating, konjac flour technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of high content, environmental and human harm, difficult to degrade, etc., to achieve good biosafety, good biocompatibility, Easily degradable effect

Active Publication Date: 2021-08-03
上海鸿鹄化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, organic solvent coatings have good solubility and good coating uniformity, but the dispersed coatings have a high content of volatile organic compounds (VOC), which will cause air pollution during use and cause serious greenhouse effects in some areas, which are gradually restricted , Eliminate products used; water-dispersible coatings contain almost no VOC, and are products that are promoted and encouraged to be used
[0003] Common water-based coatings in the prior art, such as polyvinyl alcohol coatings, water-soluble alkyd resin coatings, water-soluble epoxy resin coatings, etc., these coatings mostly use artificial synthetic resins as the main film-forming substance, and their biocompatibility is poor , difficult to degrade, harmful to the environment and the human body, difficult to apply to children's toys, stationery, food and pharmaceutical packaging, and its raw material resin synthesis process is complicated and the production cost is high

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0053] In a specific embodiment of the preparation method of the water-based paint resin based on konjac flour, it may further comprise the steps:

[0054] step 1):

[0055] Konjac flour is dried to control its water content below 2%, then it is uniformly mixed with organic acid and / or its anhydride in a certain mass ratio, a certain proportion of catalyst is added, and it is reacted at a certain temperature for a certain period of time to obtain Konjac flour organic acid ester with a degree of substitution of 1.6~2.3, after the reaction is completed, add distilled water to the reaction system, filter, and dry the solid to obtain the product; measure the degree of substitution and reserve it, and the remaining liquid can be reused after being concentrated and distilled.

[0056] Wherein said konjac flour is the solid matter extracted from the tubers of konjac varieties with higher KGM content such as flower konjac, white konjac, Youle konjac, Ximeng konjac or the dried and pul...

Embodiment 1

[0088] (1) Take 1.5kg of refined konjac flour (dried in advance, the water content is less than 2%, and its KGM content is 85%), add 0.6kg of acetic anhydride in an ice-water bath, stir well; gradually heat up to about 100°C, continue Add 2.25kg of acetic anhydride and 60g of p-toluenesulfonic acid, continue to stir, react at 100°C for 2h, heat up to 115°C for 1h; then cool down to about 40°C, add 8kg of deionized water to the reactant system, and After precipitating, concentrating and filtering, drying and pulverizing the obtained solid components to obtain the product konjac flour organic acid ester, the measured degree of substitution is 2.02; concentrating and distilling the remaining liquid components to obtain glacial acetic acid, which can be used to reproduce acetic anhydride;

[0089] (2) Stir 275g of IPDI and 84.5g of dimethylolpropionic acid, and mix evenly; protect with nitrogen gas (nitrogen flow rate is 0.1L / min), then raise the temperature to 80°C, and react for ...

Embodiment 2

[0093] (1) Take 1.5kg of konjac dry powder (dried in advance, the water content is less than 2%, and its KGM content is 75%), add 0.9kg of butyric anhydride in the ice water bath, stir well; gradually raise the temperature to about 130°C, continue Add 2.5 kg of butyric anhydride and 75 g of perchloric acid, keep stirring, react at 130 °C for 0.5 h, then raise the temperature to 170 °C for 1 h; then cool down to about 40 °C, add 9 kg of deionized water to the reaction system , then precipitate, concentrate, filter, dry and pulverize the solid components to obtain the product konjac flour organic acid ester, the measured degree of substitution is 1.86, the remaining liquid components are concentrated and distilled to obtain butyric acid, which can be reproduced anhydride;

[0094] (2) Stir 200g of TDI and 76g of dimethylolpropionic acid, mix evenly, then pass nitrogen protection (nitrogen flow rate is 0.1 L / min), heat up to 60°C, and react for 2.5h;

[0095] (3) Add 170 g of ep...

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Abstract

The invention discloses a water-based paint resin based on konjac flour, a preparation method and a composition thereof. The water-based paint resin is prepared by the following steps: (1) reacting konjac flour with an organic acid and / or an anhydride of the organic acid to obtain an organic acid ester of konjac flour; react to obtain the second component; (3) react the konjac flour organic acid ester, the second component, and epoxy resin under a catalyst and an inert environment to obtain a precursor resin; (4) prepare the precursor The organic solvent in the resin is removed, and water is added to obtain the water-based paint resin. The obtained water-based coating based on konjac flour has good biocompatibility, biosafety and degradability, and can be widely used in children's toys, stationery, food and medicine packaging.

Description

technical field [0001] The invention relates to the technical field of water-based paint resin and its composition. Background technique [0002] Coatings are a large class of materials that are coated on the surface of a substrate and cured to form a film to decorate and protect the substrate. It is composed of film-forming substances dispersed (dissolved) in water or organic solvents. Among them, organic solvent coatings have good solubility and good coating uniformity, but the dispersed coatings have a high content of volatile organic compounds (VOC), which will cause air pollution during use and cause serious greenhouse effects in some areas, which are gradually restricted , Eliminate used products; and water-dispersible coatings contain almost no VOC, which are products that are promoted and encouraged to be used. [0003] Common water-based coatings in the prior art, such as polyvinyl alcohol coatings, water-soluble alkyd resin coatings, water-soluble epoxy resin coat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/65C08G18/64C08G18/58C08G18/34C09D175/04
CPCC08G18/58C08G18/6484C08G18/6541C09D175/04
Inventor 马素德陈君魏刚蔡芳共张建军黄浩
Owner 上海鸿鹄化工科技有限公司
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