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A kind of synthetic method of self-crosslinking water-based resin

A synthesis method and technology of cross-linked resin, applied in the direction of epoxy resin coating, coating, etc., can solve the problems of cumbersome process and achieve the effect of simple process, fast reaction and good water dispersibility

Active Publication Date: 2022-07-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The problem with existing resins for water-based coatings is that other components need to be added for curing, which increases the cumbersome process; while epoxy resin is a thermoplastic polymer prepolymer, which needs to be converted into linear molecules under the action of a curing agent. Only with a three-dimensional network structure can we obtain high polymers with use value

Method used

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  • A kind of synthetic method of self-crosslinking water-based resin
  • A kind of synthetic method of self-crosslinking water-based resin
  • A kind of synthetic method of self-crosslinking water-based resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) The bisphenol A epoxy resin E-20 containing 1 mole of epoxy group, 0.5 mole of threonine, 0.01 mole of dimethylaminoethanol, and 1 mole of water were sequentially added to the reactor, and the temperature was heated at 120° C. The reaction was stirred at high speed for 1 hour. With the progress of the reaction, the whole becomes clear and transparent from milky white to obtain a self-crosslinkable resin.

[0018] (2) Curing the obtained self-crosslinkable resin at 100°C for 15 minutes to obtain a transparent yellowish crosslinked resin coating film, such as image 3 .

[0019] figure 1 For the H NMR spectrum of the cross-linked resin coating film, it can be seen that after the polymerization reaction, the characteristic peaks of epoxy groups originally located at 2.7 and 2.8 ppm disappeared, and the characteristic of the methyl group of threonine appeared at 1.25 ppm. peak, which proves that in this polymerization reaction, the epoxy group and the amino group of ...

Embodiment 2

[0022] (1) The bisphenol A epoxy resin E-20 containing 1 mole of epoxy group, 0.5 moles of threonine, 0.1 moles of dimethylaminoethanol, and 100 moles of water were sequentially added to the reactor, and the temperature was heated at 50°C. The reaction was stirred at high speed for 12 hours. With the progress of the reaction, the whole becomes clear and transparent from milky white to obtain a self-crosslinkable resin.

[0023] (2) Curing the obtained self-crosslinkable resin at 150° C. for 5 minutes to obtain a transparent yellowish crosslinked resin coating film.

[0024] It is confirmed by proton NMR that the cross-linked resin coating film synthesized in the above examples contains hydroxyl groups and carboxyl groups, so that the cross-linked resin coating film has very good water dispersibility, and the cross-linked resin coating film still contains a large amount of hydroxyl groups , so that it still has good adhesive properties.

Embodiment 3

[0026] (1) The bisphenol A epoxy resin E-20 containing 1 mole of epoxy group, 0.5 mole of threonine, and 0.01 mole of 2-dimethylamino-2-methyl-1- Propanol and 1 mol of water were reacted with high-speed stirring at 120° C. for 1 hour. With the progress of the reaction, the whole becomes clear and transparent from milky white to obtain a self-crosslinkable resin.

[0027] (2) Curing the obtained self-crosslinkable resin at 100° C. for 15 minutes to obtain a transparent yellowish crosslinked resin coating film.

[0028] It is confirmed by proton NMR that the cross-linked resin coating film synthesized in the above examples contains hydroxyl groups and carboxyl groups, so that the cross-linked resin coating film has very good water dispersibility, and the cross-linked resin coating film still contains a large amount of hydroxyl groups , so that it still has good adhesive properties.

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Abstract

The invention discloses a method for synthesizing a self-crosslinking water-based resin. The method comprises the following steps: adding 1 mole of epoxy group-containing epoxy resin, 0.5 mole of threonine, and 0.01-0.1 mole of neutralization to a reactor. agent, 1-100 moles of water, and react with high-speed stirring at 50-120°C for 1-12 hours to obtain a self-crosslinkable resin; cure the obtained self-crosslinkable resin at 100-150°C for 5-15 minutes, that is, A transparent yellowish coating film can be obtained. The resin obtained by the invention has low cost, good stability, low toxicity and easy curing, and can be used in the fields of coatings, adhesives, thermosetting plastic products and the like.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a method for synthesizing a self-crosslinking water-based resin. Background technique [0002] The problem with the existing resins for water-based coatings is that other components need to be added for curing, which increases the complexity of the process; and epoxy resin is a prepolymer of thermoplastic polymers, which needs to be converted into linear molecules under the action of a curing agent. For the three-dimensional network three-dimensional structure, can obtain high polymer with use value. Therefore, when two-component epoxy resin is used, it is necessary to mix resin and curing agent in a certain metering ratio, and cross-link curing under suitable conditions. When the resin has chemical self-crosslinking ability, it can be formulated into one component. From the consideration of simplifying the process and improving the applicability, one-component epo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/14C09D163/00C08J3/24C08L63/00
CPCC08G59/1477C09D163/00C08J3/24C08J2363/00
Inventor 仇涛磊沈宇鹏马佳奇冯祎平韩金
Owner ZHEJIANG UNIV OF TECH