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Production of rosin based aqueous polyurethanes

A water-based polyurethane and rosin-based technology, applied in the field of preparation of rosin-based water-based polyurethane, can solve the problems of low hardness, poor water resistance, low gloss of water-based polyurethane, etc., and achieve the effect of good heat resistance

Inactive Publication Date: 2009-08-05
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of low gloss, low hardness, heat resistance and poor water resistance of water-based polyurethane in the prior art, the invention provides a method for preparing rosin-based water-based polyurethane. The prepared water-based polyurethane has high gloss, high hardness, Good heat and water resistance

Method used

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  • Production of rosin based aqueous polyurethanes

Examples

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preparation example Construction

[0019] A preparation method of rosin-based water-based polyurethane, the steps are:

[0020] The first step is to prepare rosin-based polyester polyol: compound the modified rosin polyacid alone or with a dibasic acid with 3 to 6 carbon atoms in any ratio, and then mix it with a small molecule polyol, and the alkyd ratio is 1:1.1 -1:1.6, a rosin-based polyester polyol with a number average molecular weight of 500-3000 prepared through dehydration condensation reaction at 150-270°C;

[0021] The second step is to prepare rosin-based water-based polyurethane: the rosin-based polyester polyol obtained in the first step is compounded alone or with polyether polyol or polyester polyol in any ratio, and vacuum dehydrated at 100-120°C for 2-3 After cooling, add diisocyanate and catalyst to react at 60-90°C for 1-3 hours, then add hydrophilic monomer and react at 60-90°C for 1-2 hours, then add organic solvent and small molecule chain extender at 0-90°C React at 70°C for 3 to 6 hours...

Embodiment 1

[0030] Add propylene pimaric acid 74.8g, 1,4-butanediol 27g in the 500ml flask that is equipped with thermometer, agitator, air guide tube, distillation head, 220 ℃ react until the acid value of the system drops to 40mg / g, then vacuum condition The reaction was carried out until the acid value of the system dropped below 3 mg / g, and the temperature was lowered to 160° C. to discharge to obtain a rosin-based polyester polyol with a hydroxyl value of 95.44 mg / g. Depend on figure 1 It can be seen that at 3438.35cm -1 Contains the characteristic absorption peak of hydroxyl at 1728.87cm -1 contains the characteristic absorption peak of ester carbonyl, indicating that the product is indeed a polyester polyol.

[0031] Take 10g of the above-mentioned rosin-based polyester polyol and 15g of polyether N-210, vacuum dehydrate at 120°C for 2-3 hours, add 16g of toluene diisocyanate and 0.02g of dibutyltin dilaurate after cooling, and react at 85°C for 1.5 hours , then add 2.3g of dimeth...

Embodiment 2

[0036] Add propylene pimaric acid 74.8g, diethylene glycol 42.4g in the 500ml flask that is equipped with thermometer, agitator, air guide tube, distillation head, 220 ℃ react until the acid value of the system drops to 40mg / g, then vacuum condition The reaction was carried out until the acid value of the system dropped below 3 mg / g, and the temperature was lowered to 160° C. to discharge to obtain a rosin-based polyester polyol with a hydroxyl value of 195.37 mg / g.

[0037] Take the above-mentioned rosin-based polyester polyol 5g, polyether N-210 15g, vacuum dehydrate at 100-120°C for 2-3 hours, add 16g of toluene diisocyanate and 0.02g of dibutyltin dilaurate after cooling, and react at 85°C After 1.5 hours, add 2.3g of dimethylolpropionic acid, react at 85°C for 1 hour, finally add 4.3g of diethylene glycol and 12g of acetone, react at 60°C for 4-5 hours, add triethylamine to neutralize after cooling, Stir vigorously, disperse in 100 g of water at a rotational speed of 600 ...

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Abstract

The invention discloses a preparation method of rosin-based waterborne polyurethane, which is characterized in that only rosin-based polyester polyol or the compounded rosin-based polyester polyol and regular olyether or polyester polyol is dehydrated in a vacuum way for 2-3 hours at the temperature of 100-120 DEG C, vulcabond and catalyst are added after cooling to react for 1-3 hour(s) at the temperature of 60-90 DEG C, hydrophilic monomer is added to react for 1-2 hours at the temperature of 60-90 DEG C, organic solvent and micromolecule chain extendor are added to react for 3-6 hours at the temperature of 0-70 DEG C, and salt forming agent is added after cooling, is dispersed in water after being stirred dramatically, and finally the solvent is removed in a vacuum way to obtain the rosin-based waterborne polyurethane. The invention has the advantages of high glossiness, big hardness, good heat and water resisting properties, and the like.

Description

technical field [0001] The invention relates to a method for preparing waterborne polyurethane, in particular to a method for preparing rosin-based waterborne polyurethane. Background technique [0002] The characteristic of polyurethane is that it contains repeated urethane bond structural units—NHCOO—on the main chain of the polymer, and is usually polymerized by stepwise polymerization of dibasic or polyisocyanate and polyether polyol or polyester polyol. In addition to the formation of urethane groups, groups such as urea and biuret are also formed, so the polyurethane material has excellent adhesive strength, toughness, abrasion resistance, chemical resistance and durability. Water-based polyurethane is a binary colloidal system formed by dissolving or dispersing polyurethane in water. It relatively completely retains the characteristics of solvent-based polyurethane. At the same time, because its continuous phase is water, it has no pollution to the environment, is saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42
Inventor 商士斌王宏晓宋湛谦王丹饶小平
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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