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Polyurethane waterproof coating and preparation method thereof

A polyurethane waterproofing and coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of waterproof coating performance degradation, lack of elasticity, shortening the service life of waterproof coatings, etc.

Active Publication Date: 2021-07-06
广州鸿泰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although small molecule alcohols have low viscosity and rapid reaction, the curing process causes the polyurethane material to shrink greatly, making the polyurethane material brittle and lacking in elasticity, and reducing the bonding performance of the polyurethane waterproof coating. Therefore, a large amount of propellant is usually added to the polyurethane waterproof coating plasticizers to improve their properties
However, these small molecule additives are easy to migrate from the waterproof coating, which reduces the performance of the waterproof coating and shortens the service life of the waterproof coating

Method used

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  • Polyurethane waterproof coating and preparation method thereof
  • Polyurethane waterproof coating and preparation method thereof
  • Polyurethane waterproof coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Preparation of tributyl citrate: add 100mol citric acid, 380mol butanols, p-benzenemethanesulfonic acid (mass fraction is 2% of the total mass of citric acid and alcohol) and 360mol water-carrying agent cyclohexane in the reactor alkane, heated to 120°C under stirring, refluxed for 6 hours, recovered excess alcohol by distillation under reduced pressure to obtain crude tributyl citrate, then washed the crude tributyl citrate with 2% sodium bicarbonate solution, removed the catalyst, and recovered the organic phase Tributyl citrate is obtained.

[0027] (2) Preparation of carboxyl-terminated tributyl citrate: add 100mol carbon tetrachloride, 70mol tributyl citrate and 70mol succinic anhydride to the reactor, feed nitrogen into the reactor, stir and heat up to 80°C, and react for 4h , After cooling, extract and separate with ethyl acetate, dry the organic phase with anhydrous calcium chloride, filter under reduced pressure after drying for 8 hours, and obtain the prod...

Embodiment 2

[0030] (1) Preparation of tripentyl citrate: add 100mol citric acid, 400mol amyl alcohol, p-benzenemethanesulfonic acid (mass fraction is 2% of the total mass of citric acid and alcohol) and 370mol water-carrying agent cyclohexane in the reactor alkane, stirred and heated to 130°C, refluxed for 5 hours, recovered excess alcohol by distillation under reduced pressure, and obtained the crude product of tripentyl citrate, then washed the crude product of triamyl citrate with 2% sodium bicarbonate solution, removed the catalyst, and recovered the organic phase This gives tripentyl citrate.

[0031] (2) Preparation of carboxyl-terminated tripentyl citrate: add 100 mol carbon tetrachloride, 70 mol tripentyl citrate and 70 mol glutaric anhydride to the reaction kettle, feed nitrogen into the reaction kettle, stir and heat up to 60 ° C, and react for 7 hours , After cooling, extract and separate with ethyl acetate, dry the organic phase with anhydrous calcium chloride, filter under re...

Embodiment 3

[0034] (1) preparation of trioctyl citrate: add 100mol citric acid in the reactor, 380mol octanol, toluenesulfonic acid (mass fraction is 2% of the total mass of citric acid and alcohol) and 360mol water-carrying agent toluene, Heat up to 150°C under stirring, reflux for 4 hours, and recover excess alcohol by distillation under reduced pressure to obtain crude trioctyl citrate, then wash the crude trioctyl citrate with 2% sodium bicarbonate solution, remove the catalyst, and recover the organic phase to obtain lemon trioctyl acid.

[0035] (2) Preparation of carboxyl-terminated trioctyl citrate: add 100 mol carbon tetrachloride, 70 mol trioctyl citrate and 70 mol adipic anhydride to the reaction kettle, feed nitrogen into the reaction kettle, stir and heat up to 75°C, and react for 5 hours , After cooling, it was extracted and separated with ethyl acetate, and the organic phase was dried with anhydrous calcium chloride, dried for 8 hours and filtered under reduced pressure, an...

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Abstract

The invention discloses a polyurethane waterproof coating and a preparation method thereof. The polyurethane waterproof coating comprises a novel dihydric alcohol chain extender. A preparation method of the chain extender comprises the following steps that firstly, citric acid and alcohol react to prepare citric acid triester; then dianhydride acylation is carried out to prepare carboxyl-terminated citric acid triester; and then the carboxyl-terminated citric acid triester and 1,4-butanediol diglycidyl ether react to prepare the chain extender. The prepared chain extender is used for preparing the polyurethane waterproof coating; and since citrate is combined into chain extender molecules through chemical bonds and the steric effect of side chains can reduce the reaction activity of the chain extender and relieve hydrolysis of ester bonds, excellent mechanical properties, water resistance and durability can be provided for the polyurethane coating.

Description

technical field [0001] The invention belongs to the field of waterproof coatings, in particular to a polyurethane waterproof coating and a preparation method thereof. Background technique [0002] Polyurethane waterproof coating belongs to chemical reaction type waterproof coating. After curing, it becomes a rubber-like high-elastic coating film. With its excellent comprehensive performance, this material is the most successful coating film waterproof material used so far. It is widely used in building waterproofing applications. occupy an important position in. Chain extenders are very important to the synthesis of polyurethane materials, directly affect the mechanical properties and process properties of products, and are necessary reagents in polyurethane production. Polyurethane is a prepolymer formed by the reaction of aliphatic or aromatic monomers containing diisocyanate groups and polyesters or polyethers containing dibasic or polyols. When used, a chain extender is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D7/61
CPCC09D175/08C09D7/61C08K2003/265C08K3/26
Inventor 不公告发明人
Owner 广州鸿泰新材料科技有限公司