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A kind of preparation method of baking varnish type waterborne polyurethane/amino resin composite emulsion

A water-based polyurethane and amino resin technology, applied in the field of water-based polyurethane, can solve the problems of difficult adhesion of coatings, low content of water-based polyurethane, and emission of volatile organic compounds, and achieve reduced emissions, high cross-linking degree, high hydroxyl functionality and hydroxyl value effect

Active Publication Date: 2016-07-06
UNIV OF SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem that the coating is difficult to adhere, organic solvents such as N-methylpyrrolidone and N,N-dimethylacetamide, which account for nearly 50% of the total mass, are used in the preparation of the adhesion promoter. The content of water-based polyurethane in this system is small. There is also the same problem of volatile organic compound emissions as the above-mentioned several composite systems

Method used

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  • A kind of preparation method of baking varnish type waterborne polyurethane/amino resin composite emulsion
  • A kind of preparation method of baking varnish type waterborne polyurethane/amino resin composite emulsion

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Experimental program
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Effect test

Embodiment 1

[0022] Synthesize first with polypropylene carbonate diol as one of the components of the polyhydroxyl-terminated water-based polyurethane prepolymer emulsion: 120 grams of number-average molecular weight is 2000 of PPC and 30 grams of number-average molecular weight of 2000 PPG at 110 After dehydration at -120°C for 1 hour, cool to 50°C, add 100 grams of IPDI, react at 90°C for 3 hours, add 18 grams of DMPA, 7 grams of BDO, 3 grams of TMP, 250 grams of acetone and 0.4 grams of DBTDL, After 8 hours of reaction, a polyurethane prepolymer solution was obtained; 25.83 grams of diethanolamine was added, and the reaction was carried out at 60°C for 3 hours; After 10 minutes, add 696 grams of water, stir for 10 minutes, transfer the reaction product to a rotary evaporator, remove acetone at 40-50°C under vacuum conditions, and obtain polyhydroxyl-terminated water-based polyurethane prepolymer emulsion I (PUD -1), the hydroxyl value of its solid component is 88.3mgKOH / g, and the acid...

Embodiment 2

[0030] 95 grams of PPC with a number average molecular weight of 2000 and 55 grams of PPG with a number average molecular weight of 2000 were dehydrated at 110-120°C for 1 hour and then cooled to 50°C. Added 100 grams of IPDI and reacted at 90°C for 3 hours, followed by adding 18 gram DMPA, 7 gram BDO, 3 gram TMP, 250 gram acetone and 0.4 gram DBTDL, obtain polyurethane prepolymer solution after 8 hours of reaction at 60 ℃; Add 25.83 gram diethanolamine again, react 3 hours at 60 ℃; Add 14 grams of TEA under the condition of rotating speed shearing per minute and 0-40 °C, and react for 2 minutes, add 696 grams of water, stir for 10 minutes, transfer the reaction product to a rotary evaporator, and heat it at 40-50 °C, Acetone was removed under vacuum conditions to obtain polyhydroxyl-terminated aqueous polyurethane prepolymer emulsion II (PUD-2), the hydroxyl value of its solid component was 88.3 mgKOH / g, and the acid value was 24.8 mgKOH / g;

[0031] Then 500 grams of PUD-2 pr...

Embodiment 3

[0033] 120 grams of PPC with a number average molecular weight of 2000 and 30 grams of PPG with a number average molecular weight of 2000 were dehydrated at 110-120 °C for 1 hour and then cooled to 50 °C, 78.4 grams of TDI were added, and after reacting at 80 °C for 3 hours, 18 gram DMPA, 7 gram BDO, 3 gram TMP, 250 gram acetone and 0.4 gram DBTDL, obtain polyurethane prepolymer solution after 8 hours of reaction at 60 ℃; Add 25.83 gram diethanolamine again, react 3 hours at 60 ℃; Add 14 grams of TEA under the condition of rotating speed shearing per minute and 0-40 °C, and react for 2 minutes, add 696 grams of water, stir for 10 minutes, transfer the reaction product to a rotary evaporator, and heat it at 40-50 °C, Acetone was removed under vacuum conditions to obtain polyhydroxyl-terminated aqueous polyurethane prepolymer emulsion III (PUD-3), the hydroxyl value of its solid component was 94.9 mgKOH / g, and the acid value was 26.7 mgKOH / g;

[0034] Then 500 grams of PUD-3 pre...

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Abstract

The invention discloses a preparation method of an amino resin-based water-based polyurethane / amino resin composite emulsion for making water-based baking paint, which is characterized by first combining polypropylene carbonate diol and conventional macromolecular diol, Or replace all conventional macromolecular diols, react with diisocyanate, dimethylol propionic acid, small molecule chain extender and crosslinking agent, then use end capping agent to cap, and obtain polyhydroxy capping through neutralization and emulsification. The water-terminated polyurethane prepolymer emulsion is then compounded with amino resin, catalyst, coating auxiliary and deionized water to obtain a water-based polyurethane / amino resin composite emulsion. The method does not need to add organic co-solvent, and at the same time, because polypropylene carbonate is used as one of the raw materials and end-capped with a capping agent containing secondary amino groups and hydroxyl groups, it has higher hydroxyl functionality and hydroxyl value, and the cured baking paint The molecular chain has a high degree of cross-linking, the water and corrosion resistance of the coating is improved, and the cost and environmental protection advantages are obvious.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane, and in particular relates to the synthesis and application of polyhydroxyl-terminated water-based polyurethane prepolymer emulsion with polypropylene carbonate diol as one of the components and the application of the prepolymer and amino resin to form a baking varnish The preparation method of water-based polyurethane / amino resin composite emulsion. Background technique [0002] At present, the amino resin-based compounds used to make water-based baking varnishes mainly include water-based acrylic resin / amino resin, water-based alkyd resin / amino resin, and water-based polyester / amino resin composite systems. Generally speaking, the molecular chain of acrylic acid is a chain-like linear structure. The baking varnish made of water-based acrylic resin / amino resin composite system is more sensitive to temperature and has the characteristics of "hot sticky and cold brittle". Problems...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C09D175/06C09D161/32C08G18/83C08G18/44C08G18/48C08G18/42C08G18/34C08G18/32
Inventor 张兴元许海燕戎佳萌孙伟许飞徐玉华徐玉俊
Owner UNIV OF SCI & TECH OF CHINA
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