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Self-defoaming water-based polyurethane emulsion

A water-based polyurethane and emulsion technology, applied in the field of polyurethane emulsion, can solve the problems of poor defoaming durability of external defoaming agent, poor compatibility of defoaming agent and polyurethane, and large-scale foam production efficiency, etc., to achieve good hand feeling, Increased glass transition temperature and excellent mechanical properties

Inactive Publication Date: 2014-01-29
SHANGHAI CHENGYING NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the promotion of the use of polyurethane emulsion, the defoaming problem of polyurethane aqueous emulsion is becoming more and more prominent. A large amount of foam is easy to be generated during the process of brushing on the machine, resulting in low production efficiency. Poor compatibility leads to a decrease in the stability of the emulsion

Method used

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  • Self-defoaming water-based polyurethane emulsion
  • Self-defoaming water-based polyurethane emulsion
  • Self-defoaming water-based polyurethane emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The self-defoaming aqueous polyurethane emulsion of the present embodiment is prepared by the method comprising the following steps:

[0025] (1) Material preparation:

[0026] Prepare raw materials according to the following components and quality: 10.00g isophorone diisocyanate, 10.00g hexamethylene diisocyanate, 30.00g commercially available polybutylene adipate (Mn=3000), 10.00g commercially available hydroxyl Silicone oil (Mn=300, hydroxyl content 9.0%), 5.00g hydrophilic chain extender 2,2-dimethylolbutyric acid, 0.50g chain extender ethylene glycol, 1.00g chain extender diethylenetriamine, 0.50 g crosslinking agent glycerol, 3.00g neutralizing agent N,N-dimethylethanolamine, 30.00g urethane grade acetone (about 38.00ml);

[0027] (2) Preparation of prepolymer:

[0028] Add 30.00g of polybutylene adipate (Mn=3000) into a four-neck flask equipped with a thermometer, condenser and stirrer, vacuumize and heat to 110°C, remove water for 2.0h, and then add 10.00g of ...

Embodiment 2

[0037] The self-defoaming aqueous polyurethane emulsion of the present embodiment is prepared by the method comprising the following steps:

[0038] (1) Material preparation:

[0039] Prepare raw materials according to the following components and quality: 25.00g hexamethylene diisocyanate, 25.00g commercially available polycarbonate (Mn=2000), 15.00g commercially available hydroxyl silicone oil (Mn=400, hydroxyl content 8.50%), 6.00g Hydrophilic chain extender 2,2-dimethylolbutyric acid, 2.50g chain extender triethylene glycol, 2.00g chain extender triethylenetetramine, 1.00g crosslinking agent trimethylolpropane, 3.50 g neutralizer N,N-dimethylethanolamine, 20.00g acetone (about 25.00ml);

[0040] (2) Preparation of prepolymer:

[0041] Add 25.00g of polycarbonate (Mn=2000) into a four-neck flask equipped with a thermometer, condenser and stirrer, vacuumize and heat to 120°C, remove water for 1.5h, then add 15.00g of hydroxy silicone oil and cool down to 75 Stir at ℃ for ...

Embodiment 3

[0050] The self-defoaming aqueous polyurethane emulsion of the present embodiment is prepared by the method comprising the following steps:

[0051] (1) Material preparation:

[0052] Prepare raw materials according to the following components and quality: 30.00g hexamethylene diisocyanate, 20.00g commercially available polyneopentyl adipate (Mn=3000), 20.00g commercially available hydroxyl silicone oil (Mn=500, hydroxyl content 8.0%), 7.00g hydrophilic chain extender 2,2-dimethylolbutyric acid, 7.00g chain extender triethylene glycol, 0.50g chain extender triethylenetetramine, 1.50g crosslinking agent triethylene glycol Methylolpropane, 4.00g neutralizer N,N-dimethylethanolamine, 10.00g butanone (about 13.00ml);

[0053] (2) Preparation of prepolymer:

[0054] Add 20.00g of polyneopentyl glycol adipate (Mn=3000) into a four-neck flask equipped with a thermometer, condenser and stirrer, vacuumize and heat to 130°C, remove water for 1.0h, then add 20.00g Hydroxyl silicone oi...

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Abstract

The invention relates to a self-defoaming water-based polyurethane emulsion which is prepared by the following steps: vacuum-heating macromolecular polyhydric alcohol to 110-140 DEG C, and dewatering for 0.5-2.0 hours; adding hydroxyl silicone oil and reducing the temperature to 60-75 DEG C, and stirring for 0.5-1.0 hour; adding isocyanate and stirring for reaction at 70-85 DEG C for 1.5-3.0 hours; adding a hydrophilic chain extender and a crosslinking agent, and stirring for reaction for 1.0-2.0 hours to obtain a prepolymer; reducing the temperature of the prepolymer to 40-50 DEG C; adding a solvent, dropwise adding a neutralizer and stirring for 15-45 minutes; and after the chain extender is dissolved in water, dropwise adding into the neutralized prepolymer, and stirring at a stirring rate of 1,000-3,000rpm for 20-40 minutes to obtain the emulsion. According to the self-defoaming water-based polyurethane emulsion provided by the invention, the chemical structure of the molecular chain segment of polyurethane is changed from a synthesis source of polyurethane, and the silicon with low surface energy is introduced so that the emulsion has excellent defoaming ability; and after film formation, the emulsion has good water resistance and solvent resistance.

Description

technical field [0001] The invention relates to the technical field of polyurethane emulsions, in particular to a self-defoaming aqueous polyurethane emulsion. Background technique [0002] With the improvement of the quality of human life, environmental protection regulations are becoming more and more stringent. Various environmental regulations and regulations have strict restrictions on the emission of volatile organic compounds (VOC) and the content of harmful solvents. Because water-based polyurethane emulsion uses water as the dispersion medium, it has the advantages of non-toxic, non-polluting, non-flammable, energy-saving, safe and reliable, etc. Therefore, water-based polyurethane emulsion coatings have gained widespread attention in recent years. In terms of industrialization, foreign countries have formed a certain production scale in the early 1980s. For example, Bayer Corporation of Germany, Japan's major ink companies, and Wyandotte Chemical Corporation of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/61C08G18/66C08G18/12C09D175/06C09D175/08
CPCC08G18/0823C08G18/12C08G18/6633C08G18/6644C08G18/6659C08G18/6666C08G18/6674C08G18/6692C08G18/3228C08G18/3234
Inventor 虞明东任天翔王玉春
Owner SHANGHAI CHENGYING NEW MATERIALS
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