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Nano-bentonite modified watersoluble polyurethane paint and manufacture method thereof

A water-based polyurethane and nano-bentonite technology, used in polyurea/polyurethane coatings, coatings, latex paints, etc., can solve the problems of unsatisfactory tear strength, unsatisfactory UV resistance, unsatisfactory tensile strength, etc. The effect of anti-ultraviolet aging function, good ultraviolet absorption function and excellent physical and mechanical properties

Inactive Publication Date: 2008-08-20
李伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyurethane material is a widely used synthetic resin. Polyurethane is generally solvent-based, but organic solvents are flammable, explosive, volatile, and have a strong smell. When used, they cause air pollution and are more or less toxic.
In recent years, with the increasing awareness of environmental protection, some developed countries have formulated fire protection regulations and solvent regulations. These factors have promoted the development of water-based polyurethane materials. Water-based polyurethane refers to a type of polyurethane formed by dissolving or dispersing polyurethane in water. Resin, which has the advantages of non-combustibility, low odor, no pollution to the environment, energy saving, and convenient operation and processing, but water-based polyurethane materials also have some disadvantages, such as the physical and mechanical properties of the adhesive layer need to be further improved, the anti-ultraviolet performance is not ideal, and the tensile strength The strength is not ideal enough, especially the tensile strength after film formation, tear strength and other properties are not ideal. There are some improved methods, but the synthesis steps are quite complicated and the cost is high, which is not conducive to industrialized large-scale production. , limiting the use and promotion of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dehydrate 54g of polyoxypropylene diol at 100°C, add 33g of 4,4'-diphenylmethane diisocyanate, react at 75°C for 1 hour, heat up to 90°C for 2 hours, add 2,2 dimethylolpropionic acid 5.3g, react at 90°C for 2 hours, cool down to 70°C, add 100g of acetone and bring it under reflux for 2 hours, cool down to 30°C, add 3.9g of triethylamine and react for 10 minutes to prepare a polyurethane prepolymer; take 3.4g and 227g of nano-bentonite Heating the ionized water to 50°C with stirring the nano-bentonite aqueous dispersion; slowly adding the above-mentioned polyurethane prepolymer into the nano-bentonite aqueous dispersion, performing compound emulsification for 30 minutes, and removing acetone under reduced pressure to obtain a modified nano-bentonite Waterborne polyurethane coating.

Embodiment 2

[0016] Add 23.8 g of toluene diisocyanate to 54 g of polyoxypropylene diol after dehydration at 100 ° C, react at 78 ° C for 1 hour, raise the temperature to 95 ° C for 2.5 hours, add 3.5 g of 2,2 dimethylol propionic acid and trimethylol Propane 2.0g, react at 92°C for 1.5 hours, cool down to 70°C, add 100g of acetone and bring it under reflux for 2 hours, cool down to 28°C, add 2.6g of triethylamine and react for 20 minutes to prepare polyurethane prepolymer; take 2.9g and 203g of nano-bentonite Deionized water is heated to 50°C with stirring for the nano-bentonite aqueous dispersion; slowly add the above-mentioned polyurethane prepolymer into the nano-bentonite aqueous dispersion, carry out compound emulsification for 30 minutes, remove acetone under reduced pressure, and obtain nano-bentonite modified Waterborne polyurethane coating.

Embodiment 3

[0018] Add 54g of polyoxypropylene triol, dehydrate at 95°C, add 12g of hexamethylene diisocyanate, react at 80°C for 1 hour, heat up to 90°C for 2 hours, add 3.5g of 2,2 dimethylol propionic acid, 90°C React for 2 hours, lower the temperature to 75°C and add 1.3g of 1,4'butanediol to react for 1 hour, lower the temperature to 65°C and add 100g of acetone for reflux reaction for 2 hours, lower the temperature to 30°C and add 2.6g of triethylamine to react for 15 minutes to prepare Polyurethane prepolymer: Take 2.5g of nano-bentonite and 173g of deionized water and heat it to 55°C with agitation of the nano-bentonite aqueous dispersion; slowly add the above-mentioned polyurethane prepolymer into the nano-bentonite aqueous dispersion, and perform composite emulsification for 30 minutes , Acetone was removed under reduced pressure to prepare nano-bentonite modified waterborne polyurethane coatings.

[0019] The nano-bentonite modified water-based polyurethane coating obtained by ...

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Abstract

The invention discloses a nano bentonite modified waterborne polyurethane coating, which comprises: 55 to 75g of polyether polyol, 10 to 30g polyisocyanate, 3.5 to 7.5g of hydrophilicity chain expanding agent, 1.5 to 3.5g of crosslinking agent, 1.5 to 5.5g of salt forming agent, 0.8 to 3.8g of nanometer bentonite, 170 to 270g of deionized water; the particle size of nanometer bentonite is 20 to 100nm. The nano bentonite modified waterborne polyurethane coating is bonded with segmented polyurethane by hydrogen bond formation, reinforces the acting force between molecules, improves cohesive force of hard segment domain after film forming, improves degree of phase separation of soft and hard segment domain, has excellent mechanical property, and strong ultraviolet and ageing resistant function.

Description

Technical field: [0001] The invention relates to a chemical product, relating to a water-based polyurethane coating and a preparation method thereof, in particular to compounding nano-bentonite modified polyurethane coating in the water-based polyurethane coating. Background technique: [0002] Polyurethane material is a widely used synthetic resin. Polyurethane is generally solvent-based, but organic solvents are flammable, explosive, volatile, and have a strong smell. When used, they cause air pollution and are more or less toxic. In recent years, with the increasing awareness of environmental protection, some developed countries have formulated fire protection regulations and solvent regulations. These factors have promoted the development of water-based polyurethane materials. Water-based polyurethane refers to a type of polyurethane formed by dissolving or dispersing polyurethane in water. Resin, which has the advantages of non-combustibility, low odor, no pollution to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/02C09D7/12
Inventor 李伟葛云王新社张志军
Owner 李伟
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