Modified waterborne polyurethane resin and synthesis method

A technology of water-based polyurethane and synthesis method, which is applied in the field of macromolecular polymers, can solve the problems of poor film-forming property, flexibility, weather resistance and water resistance, it is difficult to meet diversified demands, and the variety of water-based polyurethane is small, and the weather resistance is achieved. Improve the performance of water resistance and water resistance, improve physical properties and feel, and have a wide range of applications.

Active Publication Date: 2014-05-07
山东聚东新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, my country's industrialized water-based polyurethane has few varieties and low output, and it is difficult to meet the current diversified needs. The film-forming properties, flexibility, weather resistance and water resistance of the products are poor, and they are mainly used for leather treatment with general properties. and fabric treatment
Defects in performance severely limit the promotion and application of waterborne polyurethane in the field of coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Prepare materials according to the following weight ratio: 15% isophorone diisocyanate (IPDI), 15% polyester polyol, 10% dimethylol propionic acid, 7% triethylamine, 3% diethylenetriamine, Diethylene glycol 10%, deionized water 40%.

[0020] The synthesis method is to put IPDI into a reactor equipped with a thermometer and a stirrer, drop polyether polyol and dimethylol propionic acid into the reaction vessel, and react at about 70°C for about 3 hours. During the reaction, acetone can be used The viscosity of the system was adjusted by the solvent, and the concentration of isocyanate was titrated by the n-dibutylamine method. The obtained hydrophilic modified polyurethane prepolymer was chain-extended with diethylene glycol for about 1.5h, then cooled to room temperature, modified by adding diethylenetriamine to deionized water dissolved in triethylamine, and dispersed at high speed Emulsify on the machine to obtain a light yellow, translucent water-based polyurethane ...

example 2

[0022] Prepare materials according to the following weight ratio: 18% isophorone diisocyanate (IPDI), 15% polyester polyol, 10% dimethylol propionic acid, 10% triethylamine, 5% diethylene glycol, Diethylenetriamine 2%, deionized water 40%.

[0023] The synthesis method is to put IPDI into a reactor equipped with a thermometer and a stirrer, drop polyether polyol and dimethylol propionic acid into the reaction vessel, react at about 75°C for about 2.5 hours, and adjust the system with acetone solvent Viscosity, the concentration of isocyanate was titrated by n-dibutylamine method. The obtained hydrophilic modified polyurethane prepolymer was chain-extended with diethylene glycol for about 3 hours, then cooled to room temperature, modified by adding diethylenetriamine to deionized water dissolved in triethylamine, and placed on a high-speed disperser After emulsification, a light yellow, translucent aqueous polyurethane dispersion is obtained.

Embodiment 2

[0024] In embodiment 2, the concentration test method of titrating isocyanate with n-dibutylamine method is to utilize isocyanate group to react with excessive di-n-butylamine to produce urea, and then use hydrochloric acid to titrate excessive di-n-butylamine to quantitatively calculate the content of isocyanate group

[0025] R-NCO+(C4H9)2NH→RNHCON(C4H9)2(C4H9)2NH+HCL→(C2H9)2NH·HCL

[0026] Steps

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PUM

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Abstract

The invention discloses modified waterborne polyurethane resin which consists of the following raw materials in percentage by weight: 10-20 percent of isophorone diisocyanate, 10-20 percent of polyester polyol, 5-10 percent of dimethylolpropionic acid, 5-10 percent of triethylamine, 5-10 percent of diethylene glycol, 40-60 percent of deionized water and 1-3 percent of diethylenetriamine. A synthesis method comprises the steps of (1) putting the isophorone diisocyanate into a stirrer, dropping the polyester polyol and the dimethylolpropionic acid, and generating reaction at temperature of about 60-80 DEG C for 3-5 hours; (2) adding the diethylene glycol to generate chain extension reaction for 1-5 hours, and cooling to room temperature; (3) emulsifying the deionized water with triethylamine on a high-speed dispersion machine, adding the diethylenetriamine to implement modification to obtain a light-yellow and semi-transparent waterborne polyurethane dispersoid. According to the modified waterborne polyurethane resin and the synthesis method, small-molecular polyhydric alcohols are modified through gradual polymerization reaction, so that the performance of waterborne polyurethane is improved, and the waterborne polyurethane can be widely applied; furthermore, the cost can be reduced.

Description

Technical field: [0001] The invention relates to a modified waterborne polyurethane resin and a synthesis method in the field of high molecular polymers. Background technique: [0002] Water-based polyurethane has the advantages of non-combustibility, non-toxicity, no pollution to the environment, energy saving, etc., and has excellent properties such as high strength, wear resistance, and safety in use. Therefore, it has been widely used and has become an important development direction in the field of new materials at home and abroad. . So far, my country's industrialized water-based polyurethane has few varieties and low output, and it is difficult to meet the current diversified needs. The film-forming properties, flexibility, weather resistance and water resistance of the products are poor, and they are mainly used for leather treatment with general properties. and fabric treatment. The performance defect seriously limits the promotion and application of waterborne pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/42C08G18/32
CPCC08G18/0823C08G18/12C08G18/348C08G18/6659C08G18/755C08G18/3206
Inventor 王福生张蕾刘淑芳
Owner 山东聚东新材料有限责任公司
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