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Method for preparing room-temperature self-crosslinking water-based polyurethane emulsion

A water-based polyurethane and self-crosslinking emulsion technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., to achieve the effects of high elasticity, high hardness, and scratch resistance physical and mechanical properties

Active Publication Date: 2010-05-19
WANHUA CHEM BEIJING +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent also does not overcome some disadvantages of two-component coatings, such as the problem of pot life after the paint is mixed, and the need for accurate measurement when using two components, etc.

Method used

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  • Method for preparing room-temperature self-crosslinking water-based polyurethane emulsion
  • Method for preparing room-temperature self-crosslinking water-based polyurethane emulsion
  • Method for preparing room-temperature self-crosslinking water-based polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 115 grams of Wannate MDI-50 (Yantai Wanhua Polyurethane Co., Ltd., 2,4'-MDI content 45-55%, 2,2'-MDI content is less than 0.5%, the rest is 4,4'-MDI, the same below ) and 150 grams of polypropylene oxide ether glycol PPG1000 with a molecular weight of 1000 were added to a four-necked flask, fed into dry nitrogen, started to stir and gradually warmed up to 70°C, and after 2 hours, the reactant was cooled to 50°C, and 15 grams of 2,2-dimethylolpropionic acid, 10 grams of 1,4-butanediol and 16 grams of pentaerythritol diacetoacetate were kept at a reaction temperature of 60° C. for 2 hours, and 140 grams of acetone was added to reduce the viscosity. Lower the temperature of the prepolymer below 30°C, add 11.5 grams of triethylamine and mix well, use a high-shear disperser to disperse by adding deionized water under rapid stirring conditions, and then add 6.1 grams of ethylenediamine dissolved in water . Finally, the acetone was distilled off under reduced pressure to obta...

Embodiment 2

[0058] Add 115 grams of Wannate MDI-50 and 150 grams of polytetrahydrofuran ether glycol PTMEG1000 with a molecular weight of 1000 into a four-necked flask, pass through dry nitrogen, start stirring and gradually raise the temperature to 70°C, and after 2 hours, cool the reactant to 50°C, divide Add 23 grams of 1,4-butanediol-2-sodium sulfonate, 12 grams of neopentyl glycol and 16 grams of trimethylolpropane monoacetoacetate in batches, keep the reaction temperature at 60°C and continue the reaction for 2 hours, add 140 grams of Acetone reduces viscosity. Lower the temperature of the prepolymer below 30°C, add 16 grams of 25% ammonia water and mix evenly, use a high-shear disperser to disperse by adding deionized water under rapid stirring conditions, and then add 10.9 grams of acetonitrile dissolved in water diamine. Finally, the acetone was distilled off under reduced pressure to obtain a stable room temperature self-crosslinking aqueous polyurethane emulsion.

Embodiment 3

[0060] 115 grams of TDI-80, 120 grams of polybutylene adipate PBA1000 with a molecular weight of 1000 and 30 grams of sodium sulfonate-based glycol (by isophthalic acid-5-sodium sulfonate, adipic acid and 1,4 -Butanediol is produced by condensation reaction, the hydroxyl value is 112mgKOH / g) into the four-necked flask, blown into dry nitrogen, start stirring and gradually raise the temperature to 70°C, after 2 hours, cool the reactant to 50°C, and add 12 gram of neopentyl glycol and 16 grams of pentaerythritol triacetoacetate, kept the reaction temperature at 60° C. to continue the reaction for 2 hours, and added 100 grams of acetone to reduce the viscosity. Lower the temperature of the prepolymer below 30°C, add 16 grams of ammonia water with a concentration of 25% and mix well, use a high-shear disperser to disperse by adding deionized water under rapid stirring conditions, and then add 4.6 grams of bismuth dissolved in water Ethylene triamine. Finally, the acetone was dist...

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Abstract

The invention discloses a method for preparing water-based polyurethane emulsion with a room-temperature self-crosslinking characteristic. The emulsion is prepared from the following raw materials in part by mass: 1) 100 parts of low-polymer diol, 2) 50 to 150 parts of polyisocyanate, 3) 8 to 28 parts of hydrophilic compound, 4) 5 to 50 parts of acetoacetyl compound, 5) 1 to 20 parts of micro-molecule dolichol compound, 6) 0.5 to 10 parts of polyamine compound, 7) 1 to 21 parts of ammonia or organic amine, selectively, 8) 0.01 to 0.1 parts of polyurethane reaction catalyst, and selectively, 9) 20 to 310 parts of organic solvent. After being formed into a film, the emulsion prepared by the method has excellent water resistance, acid and alkali resistance and chemical resistance, and also has the excellent physical and mechanical properties of high hardness, high elasticity, scratch resistance and the like.

Description

technical field [0001] The invention relates to a preparation method of an aqueous polyurethane emulsion, in particular to a preparation method of an aqueous polyurethane emulsion with room temperature self-crosslinking properties. Background technique [0002] At present, the main factors restricting the development of water-based polyurethane are long drying time, and the weather resistance, anti-blocking and scratch resistance are not as good as solvent-based coatings. The cross-linking modification can improve the mechanical properties and chemical resistance of polyurethane aqueous dispersions, which has become a very important topic in the field of waterborne polyurethane. From the perspective of the development trend in Europe and America, in order to improve the physical and mechanical properties of the paint film, it has become a general requirement to form a cross-linked structure after the emulsion is formed at room temperature or at low temperature and dried. Thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/12C09D175/12
Inventor 王景存魏鹏张龙跃魏艳飞齐莹
Owner WANHUA CHEM BEIJING
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