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Waterborne polyurethane emulsion coating and method for preparing same

A water-based polyurethane and coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of late start of research on water-based polyurethane emulsion, easy yellowing of water-based polyurethane, and unsatisfactory mechanical properties, and achieve excellent yellowing resistance And temperature resistance, not easy to decompose or turn yellow, excellent mechanical properties

Inactive Publication Date: 2010-05-19
SHANGHAI CHENGYING NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the domestic research on water-based polyurethane emulsion started late and developed slowly.
In the late 1970s, relevant research was carried out in China, but the polyether type and the aromatic type of toluene diisocyanate (TDI) accounted for the vast majority, and the water-based polyurethane synthesized by it was easy to yellow, and the surface of the film was sticky. not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A preparation method of waterborne polyurethane emulsion paint, the method may further comprise the steps:

[0047] (1) Material preparation:

[0048] Prepare raw materials according to the following components and weight: 20g isophorone diisocyanate, 20g commercially available polyester 210N, 5g dihydroxypropionic acid, 5g isophorone diamine, 1g trimethylolpropane, 3.77g triethylamine , 2gN-methylpyrrolidone (5mL);

[0049] (2) Preparation of prepolymer:

[0050] Add polyester 210N into a three-necked flask, heat it up to 130°C under vacuum, remove water for 1 hour, then cool down to 80°C, add isophorone diisocyanate into the flask, react for 2 hours, then add dihydroxypropionic acid and trimethylol Propane, continue to react for 1h, then lower the temperature to 50°C, use triethylamine as the neutralizer, use the constant pressure titration funnel to add the neutralizer into the three-necked flask, add N-methylpyrrolidone (NMP) to adjust the viscosity, and stir for ...

Embodiment 2

[0054] A preparation method of waterborne polyurethane emulsion paint, the method may further comprise the steps:

[0055] (1) Material preparation:

[0056] Prepare raw materials according to the following components and weight: 20g isophorone diisocyanate, 20g commercially available polyester 210N, 5g dihydroxypropionic acid, 5g isophorone diamine, 1g trimethylolpropane, 3.32gN,N- Dimethylethanolamine, 2g N-methylpyrrolidone (5mL);

[0057] (2) Preparation of prepolymer:

[0058] Add polyester 210N into a three-necked flask, heat it up to 130°C under vacuum, remove water for 1 hour, then cool down to 70°C, add isophorone diisocyanate into the flask, react for 3 hours, then add dihydroxypropionic acid and trimethylol propane, continue to react for 2h, then lower the temperature to 40°C, use N,N-dimethylethanolamine as the neutralizing agent, use the constant pressure titration funnel to add the neutralizing agent into the three-necked flask, add N-methylpyrrolidone (NMP) A...

Embodiment 3

[0062] A preparation method of waterborne polyurethane emulsion paint, the method may further comprise the steps:

[0063] (1) Material preparation:

[0064]Prepare raw materials according to the following components and weight: 20g isophorone diisocyanate, 20g commercially available polyester 210N, 5g dihydroxypropionic acid, 3g ethylene glycol, 1g trimethylolpropane, 3.77g triethylamine, 3g N-methylpyrrolidone;

[0065] (2) Preparation of prepolymer:

[0066] Add polyester 210N into a three-necked flask, heat it up to 130°C under vacuum, remove water for 1 hour, then cool down to 70°C, add isophorone diisocyanate into the flask, react for 5 hours, then add dihydroxypropionic acid and trimethylol Propane, continue to react for 2 hours, then lower the temperature to 40°C, use triethylamine as the neutralizing agent, use the constant pressure titration funnel to add the neutralizing agent into the three-necked flask, add N-methylpyrrolidone (NMP) to adjust the viscosity, and ...

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PUM

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Abstract

The invention relates to a waterborne polyurethane emulsion coating and a method for preparing the same. The coating comprises the following components in percentage by weight: 20 to 40 percent of isophorone diisocyanate, 20 to 40 percent of polyester, 5 to 10 percent of hydrophilic chain extender, 2 to 10 percent of chain extender, 1 to 3 percent of crosslinking agent, 3 to 10 percent of neutralizing agent, and 0.5 to 8 percent of N-methylpyrrolidone. The preparation process comprises the steps of: preparing raw materials, dewatering polyester, synthesizing prepolymers, neutralizing prepolymer, extending chains and emulsifying. Compared with the prior art, the method has the advantage that high-boiling point solvents in small quantity are used and acetone is not used, so that the coating does not contain residual acetone, has good temperature endurance, weather resistance, stripping property and water resistance, and can be widely applied in the field of pack coatings.

Description

technical field [0001] The invention relates to a coating and a preparation method thereof, in particular to a water-based polyurethane emulsion coating and a preparation method thereof. Background technique [0002] Polyurethane (PU) coatings have excellent properties such as abrasion resistance, flexibility, adhesion and chemical resistance, and are widely used in fields such as wood coatings, architectural coatings, automotive coatings, and waterproof coatings. Since the solvent-based polyurethane contains a large amount of organic solvents, it seriously pollutes the environment, especially the residual isocyanate monomer of the solvent type, which is highly toxic and extremely harmful to human health. [0003] With the improvement of the quality of human life, environmental protection regulations are becoming more and more stringent. Various environmental protection regulations have strict restrictions on the emission of volatile organic compounds (VOC) and the content o...

Claims

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Application Information

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IPC IPC(8): C09D175/14C09D175/12C09D175/06C09D5/20
Inventor 戴炜枫邓庆仪朱先义刘杰
Owner SHANGHAI CHENGYING NEW MATERIALS
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