N-methyl pyrrolidone-free polyurethane dispersions based on dimethylol propionic acid

A technology of methylpyrrolidone and dimethylolpropionic acid, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, devices for coating liquid on surfaces, etc., can solve problems such as DMPA infeasibility

Inactive Publication Date: 2006-11-22
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a step is not feasible for DMPA

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 121.6 g Desmophen  C 2200, 56.1 grams of polycarbonate diol (based on 1,6-hexanediol and 1,4-butanediol (25:75 by weight), Mn is 1000 grams / mole), 29.1 grams of dimethylolpropane A mixture of acid, 39.0 grams of neopentyl glycol, 1.4 grams of butanediol, and 160.6 grams of acetone was heated to 55°C with stirring. Then add 117.9 grams of Desmodur  W and 116.6 grams of Desmodur  I, and the mixture was heated to 68 °C. Stirring was carried out at this temperature until the NCO content reached 3.4%. Then, the mixture was cooled to 60°C, and 22.0 g of triethylamine was added. With vigorous stirring, 550 grams of this solution was dispersed in 546 grams of water, which was added at 35°C. After dispersion, stirring was continued for 5 minutes. Then, a solution of 5.0 grams of hydration trap, 3.0 grams of diethylenetriamine and 1.3 grams of ethylenediamine in water (60.7 grams) was added over 10 minutes. After complete addition of the aqueous solution, the mixture wa...

Embodiment 2

[0071] 277.9 g Desmophen  C 2200, 27.0 grams of dimethylolpropionic acid, 37.9 grams of neopentyl glycol, 1.2 grams of butanediol and 185.3 grams of acetone were heated to 55°C and stirred. Then add 37.5 grams of Desmodur  W and 174.5 grams of Desmodur  I, and the mixture was heated to 70 °C. Stirring is carried out at this temperature until the NCO content reaches 2.5%. Then, the mixture was cooled to 68°C and 20.3 g of triethylamine was added. With vigorous stirring, 600 grams of this solution was dispersed in 726.0 grams of water, which was added at 35°C. After dispersion, stirring was continued for 5 minutes. Then, a solution of 4.0 grams of hydration trap, 2.4 grams of diethylenetriamine and 1.0 grams of ethylenediamine in water (80.7 grams) was added over 10 minutes. After complete addition of the aqueous solution, the mixture was stirred at 40° C. for 20 minutes, then the acetone was removed by vacuum distillation at this temperature. In order to enable comple...

Embodiment 3

[0078] 152.1 g of Desmodur  W and 348.7 grams of Desmodur  I was heated to 55°C and stirred. Then 62.2 g of dimethylolpropionic acid were added. After 5 minutes, add 470.4 g of Desmophen over 20 minutes  A solution of C 1200, 96.3 grams of neopentyl glycol, 2.8 grams of butanediol and 377.5 grams of acetone, and the mixture was heated to 68°C. Stirring was carried out at this temperature until the NCO content reached 2.8%. Then, the mixture was cooled to 60°C, and 46.9 g of triethylamine was added. With vigorous stirring, 450 grams of this solution was dispersed in 545.9 grams of water, which was added at 35°C. After dispersion, stirring was continued for 5 minutes. Then, a solution of 2.0 g of diethylenetriamine, 1.1 g of n-butylamine and 3.5 g of ethylenediamine in water (60.7 g) was added over 10 minutes. After complete addition of the aqueous solution, the mixture was stirred at 40° C. for 20 minutes, then the acetone was removed by vacuum distillation at this te...

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Abstract

The present invention relates to aqueous polyurethane dispersions that are free from N-methylpyrrolidone and other solvents and wherein the polyurethanes are the reaction products of A) a mixture of 25% to 90% by weight of 1-isocyanate-3,3,5,-trimethyl-5-isocyanatomethylcyclohexane (IPDI) and 10% to 75% by weight of 4,4'-diisocyanatodicyclohexylmethane, wherein the preceding percentages are based on the weight of component A), with B) one or more polyols having average molarcular weights (Mn) of 500 to 6000, C) one or more compounds which have at least one OH- or NH-functional group and contain a carboxyl and / or carboxylate group, wherein at least 50 mol % of the acid groups, based on the total moles of acid incorporated into the polyurethane, are incorporated by dimethylolpropionic acid, D) one or more polyols and / or polyamines having average molecular weights (Mn) of below 500, and E) optionally one or more monoalcohols and / or monoamines. The present invention also relates to a process for preparing the aqueous polyurethane dispersions and to the use of the polyurethane dispersions for preparing coatings or adhesives.

Description

technical field [0001] The invention relates to aqueous polyurethane dispersions which contain dimethylolpropionic acid as hydrophilic agent and which have been prepared without the use of N-methylpyrrolidone, and to them as highly resistant Application of the coating composition. technical background [0002] In order to reduce the emission of organic solvents, waterborne coating compositions are increasingly being used instead of solventborne systems. An important class of waterborne coating binders are polyurethane dispersions. The advantage of polyurethane dispersions is the combination of important properties such as chemical resistance and mechanical load resistance. The use of polyurethane dispersions is advantageous especially where the coated surface is to be subjected to strong mechanical stress. [0003] In polyurethane dispersions (PUD), the poorly soluble high-melting compound dimethylolpropionic acid (DMPA) is often used as the hydrophilic component. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/70B05D7/02B05D7/06C08G18/10C08G18/16C08G18/32C08G18/48C09D175/08C09J175/08
CPCC08G18/0823C08G18/12C08G18/44C08G18/6659C08G18/673C08G18/722C08J3/07C08J2375/06C09D175/06C09D175/16Y10T428/31551C08G18/3231C08G18/72C08G18/28C08G18/32C08J3/02C08G18/40C08G18/0866C08G18/10
Inventor R·格特兹曼E·吕曼R·科普
Owner BAYER MATERIALSCIENCE AG
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