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Citric acid triester modified polyether polyol and application thereof in polyurethane waterproof coating

A technology of polyether polyol and citric acid three, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy exudation of citrate esters and decreased performance stability of polyurethane materials, and achieves good encapsulation effect and good performance. The effect of leveling and low viscosity

Inactive Publication Date: 2021-10-19
吴胜华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of preparing polyurethane materials, in order to improve the strength of the materials, it is usually necessary to add polyether polyols with more than three functions, and at the same time it is inevitable to add plasticizers to improve toughness and elasticity, such as citric acid esters. However, this The method of physical addition causes citric acid ester to ooze out easily, resulting in a decrease in the performance stability of polyurethane materials

Method used

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  • Citric acid triester modified polyether polyol and application thereof in polyurethane waterproof coating
  • Citric acid triester modified polyether polyol and application thereof in polyurethane waterproof coating
  • Citric acid triester modified polyether polyol and application thereof in polyurethane waterproof coating

Examples

Experimental program
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Effect test

Embodiment 1

[0052] (1) Preparation of tributyl citrate: add 30mol citric acid, 115mol butanol, 110mol water-carrying agent cyclohexane and Quality is the 2.5% p-benzenemethanesulfonic acid of the total mass of citric acid and alcohol and is stirred and heated to 150 ℃, reflux reaction 4h, is cooled to room temperature, product removes excess alcohol and water-carrying agent cyclohexane through decompression distillation, then The catalyst was removed by washing with 3% sodium bicarbonate solution, and finally dried to obtain tributyl citrate.

[0053] (2) Preparation of succinic anhydride acylated tributyl citrate: add 80mol carbon tetrachloride, 50mol tributyl citrate and 50mol butanediol acid anhydride, stirred and heated up to 80°C, reacted for 5h, cooled to room temperature, and the product was distilled to remove the solvent to obtain succinic anhydride acylated tributyl citrate.

[0054] (3) The preparation of tributyl citrate modified trihydric alcohol: add 90mol succinic anhydrid...

Embodiment 2

[0058] (1) Preparation of tripentyl citrate: add 30mol citric acid, 120mol amyl alcohol, 115mol water-carrying agent cyclohexane and 1.0% of the total mass of citric acid and alcohol is heated to 120° C. with stirring for 1.0% p-benzenemethanesulfonic acid, refluxed for 8 hours, and cooled to room temperature. The product is distilled under reduced pressure to remove excess alcohol and water-carrying agent cyclohexane, and then The catalyst was removed by washing with 1% sodium bicarbonate solution, and finally, tripentyl citrate was obtained by drying.

[0059] (2) Preparation of glutaric anhydride acylated tripentyl citrate: add 80mol carbon tetrachloride, 50mol tripentyl citrate and 50mol pentamyl citrate in a reaction kettle equipped with a temperature-controlled oil bath, condenser tube and stirrer acid anhydride, stirred and heated to 50°C, reacted for 8 hours, cooled to room temperature, and the product was distilled to remove the solvent to obtain glutaric anhydride ac...

Embodiment 3

[0064] (1) Preparation of trioctyl citrate: add 30mol citric acid, 110mol octanol, 115mol water-carrying agent cyclohexane and The quality is 4.0% p-benzenemethanesulfonic acid of the total mass of citric acid and alcohol is heated to 130 ℃ with stirring, reflux reaction 5h, is cooled to room temperature, product is removed excess alcohol and water-carrying agent cyclohexane through decompression distillation, then The catalyst was removed by washing with 2% sodium bicarbonate solution, and finally dried to obtain trioctyl citrate.

[0065] (2) Preparation of suberic anhydride acylated trioctyl citrate: add 100mol of carbon tetrachloride, 60mol of trioctyl citrate and 60mol of octane di acid anhydride, stirred and heated to 75°C, reacted for 6 hours, and the product was distilled to remove the solvent to obtain suberic anhydride acylated trioctyl citrate.

[0066] (3) Preparation of trioctyl citrate modified trihydric alcohol: add 90mol suberic anhydride acylated trioctyl cit...

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Abstract

The invention relates to citric acid triester modified polyether polyol and application thereof in polyurethane waterproof coating, and belongs to the technical field of high polymer materials. According to the citrate modified polyether polyol, the citric acid triester is introduced into a polyether polyol molecular side chain through a chemical bond, and the preparation method of the citrate modified polyether polyol comprises the following steps: firstly, citric acid and alcohol react to prepare the citric acid triester, and then dianhydride acylation is performed to prepare anhydride acylated citric acid triester; and then reactions with triglycidyl ether and epoxypropane are conducted to prepare the citric acid triester modified polyether polyol. The citric acid triester is located on a molecular side chain of the polyether polyol, the reaction activity of the polyether polyol is not affected, meanwhile, the polyurethane material is endowed with excellent strength and elasticity, and the branched citric acid triester enables the polyether polyol to have low viscosity and have a good wrapping effect on a filler. The citric acid triester modified polyether polyol prepared by the invention has potential and wide application value in the field of polyurethane materials.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a citrate triester modified polyether polyol and its application in polyurethane waterproof coatings. Background technique [0002] Polyether polyol is an important raw material for polyurethane products, and the raw materials for synthesizing polyether polyol are basically petroleum downstream products. With the depletion of petroleum resources and the increasing requirements for environmental protection, it is particularly important to seek petroleum substitutes in the polyurethane industry and reduce the dependence on non-renewable resources from the source. In recent years, the development trend of polyurethane at home and abroad is mainly towards the development of environmentally friendly and renewable resources, replacing the dwindling non-renewable mineral resources such as coal and petroleum. Citric acid is an organic tribasic acid, which is natura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C09D175/08C08G18/48
CPCC08G65/2615C09D175/08C08G18/4829
Inventor 不公告发明人
Owner 吴胜华
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