Waterborne polyurethane coating and preparation method thereof

A technology of water-based polyurethane and coatings, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of water-based polyurethane coatings that have not been seen in research reports and industrial application examples, and achieve excellent hydrolysis resistance, excellent low temperature flexibility, high Effect of Strength and Abrasion Resistance

Active Publication Date: 2011-04-13
HUIZHOU DAYAWAN DAZHI FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Examples

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Embodiment 1

[0021] 100 parts of polypropylene carbonate polyols with a hydroxyl value of 56 were dehydrated under vacuum at 80°C and 5 Pa for 2 hours, and 4 parts of 2,2-dimethylol propionic acid, 1,6-hexamethylene diisocyanate (HDI ) 26.6 parts, react at 75°C for 1 hour, heat up to 85°C for 2 hours, cool down to 70°C and add 2 parts of 1,4 butanediol to react for 0.5-2 hours, cool down to 60°C, add 100 parts of acetone, and reflux for 2 Hours, cool down to 40°C, add 4 parts of triethylamine, react for 20 minutes, add 200 parts of deionized water, heat to 50°C, emulsify for 30 minutes, remove acetone under reduced pressure, and obtain a water-based polyurethane coating. The obtained water-based polyurethane was placed in a centrifuge and settled for 20 minutes at a speed of 3000r / min, and no obvious precipitation was generated. Low-temperature stability: Freeze in a refrigerator at -25°C, thaw at room temperature, repeat 3-5 times, no demulsification occurs. After the paint film is dried...

Embodiment 2

[0023] 100 parts of polypropylene carbonate polyols with a hydroxyl value of 56 were dehydrated under vacuum at 80°C and 5 Pa for 2 hours, and 5 parts of 2,2-dimethylolpropionic acid, 1,6-hexamethylene diisocyanate (HDI ) 38 parts, react at 75°C for 1 hour, heat up to 85°C for 2 hours, cool down to 70°C, add 2 parts of trimethylolpropane to react for 0.5-2 hours, cool down to 60°C, add 100 parts of acetone, and reflux for 2 hours , lower the temperature to 40°C, add 10 parts of triethylamine, react for 40 minutes, add 150 parts of deionized water, heat to 50°C, emulsify for 30 minutes, remove acetone under reduced pressure, and obtain a water-based polyurethane coating. The obtained water-based polyurethane was placed in a centrifuge and settled for 20 minutes at a speed of 3000r / min, and no obvious precipitation was generated. Low-temperature stability: Freeze in a refrigerator at -25°C, thaw at room temperature, repeat 3-5 times, no demulsification occurs. After the paint f...

Embodiment 3

[0025] 100 parts of polypropylene carbonate polyols with a hydroxyl value of 56 were dehydrated under vacuum at 80°C and 5 Pa for 2 hours, and 8 parts of 2,2-dimethylol propionic acid, 1,6-hexamethylene diisocyanate (HDI ) 39.5 parts, react at 75°C for 2 hours, heat up to 85°C for 3 hours, cool down to 70°C and add 2 parts of 1,4 butanediol to react for 0.5-2 hours, cool down to 60°C, add 50 parts of acetone, and reflux for 2 Hours, lower the temperature to 40°C and add 6 parts of triethylamine, react for 30 minutes, add 300 parts of deionized water, heat to 50°C, emulsify for 30 minutes, remove acetone under reduced pressure, and obtain a water-based polyurethane coating. The obtained water-based polyurethane was placed in a centrifuge and settled for 20 minutes at a speed of 3000r / min, and no obvious precipitation was generated. Low-temperature stability: Freeze in a refrigerator at -25°C, thaw at room temperature, repeat 3-5 times, no demulsification occurs. After the pain...

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Abstract

The invention discloses a novel waterborne polyurethane coating which comprises the following components in parts by weight: 50-80 parts of poly (propylene carbonate) polyols, 10-30 parts of polyisocyanates, 3-8 parts of hydrophilic chain extender, 1-4 parts of cross-linking agent and 170-270 parts of deionized water. The invention also discloses a preparation method of the waterborne polyurethane coating. In the invention, polyatomic alcohol is used as polycarbonate (PC), so the coating not only has the advantages of a polyester polyurethane coating such as stronger abrasive resistance, scratch resistance and high bonding strength, but also does not generate hydrolysis and has strong storage stability and weather fastness. In addition, the poly (propylene carbonate) polyols can be prepared by using carbon dioxide as a raw material, thereby having low cost. The coating prepared by the preparation method has wide market prospects.

Description

technical field [0001] The invention relates to a polyurethane coating, in particular to a novel water-based polyurethane coating with hydrolysis resistance and high bonding strength and a preparation method thereof, belonging to the technical field of polyurethane coatings. Background technique [0002] Polyurethane coatings are widely used synthetic materials. Traditional polyurethane coatings are generally solvent-based. Most of the solvents used, such as toluene, benzene, and methyl ethyl ketone, are flammable, explosive, volatile, and smelly. Cause certain air pollution and cause potential harm to human body. In recent years, with the enhancement of public awareness of environmental protection, the environmental protection requirements for materials are getting higher and higher. Water-based coatings use water instead of organic solvents as the dispersion medium. The product has a small odor and does not pollute the environment. It is an environmentally friendly materia...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D7/12C08G18/66C08G18/44
Inventor 蔡志华
Owner HUIZHOU DAYAWAN DAZHI FINE CHEM
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