Waterborne polyurethane primer for coating plastic film and preparation method thereof

A water-based polyurethane and plastic film technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of restricting the development of coating films, operators' physical and environmental hazards, and unsatisfactory use conditions

Active Publication Date: 2013-02-13
HAINAN SHINER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating primer currently used in the market is mainly solvent-based polyurethane, which must be diluted with a large amount of organic solvents such as ethyl acetate, which causes the coating workshop to be full of organic volatiles, which is harmful to the operator's body. and the environment will cause harm. At the same time, the solvent residue of the coating film has become one of the main concerns of customers, which limits the development of the coating film to a certain extent.
[0003] With the increasing emphasis on human health and green environment in today's society, water-based polyurethane primer should replace solvent-based polyurethane and become the mainstream of the market, but on the contrary, the existing water-based polyurethane is not ideal for use

Method used

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  • Waterborne polyurethane primer for coating plastic film and preparation method thereof
  • Waterborne polyurethane primer for coating plastic film and preparation method thereof
  • Waterborne polyurethane primer for coating plastic film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Add 3.6 kilograms of polycaprolactone diol and 0.3 kilograms of dimethylol propionic acid to the reaction vessel, and feed N 2 protection, stirring and raising the temperature to 70° C., adding 0.24 kg of isophorone diisocyanate and reacting for 1 hour to prepare prepolymer A.

[0029] 2. Dissolve 0.03 kg of diethylenetriamine and 0.3 kg of ammonia water in 22.16 kg of water to form mixed solution B.

[0030] 3. Slowly add the mixed solution B into the prepolymer A, and add 1.2 kg of N-methylpyrrolidone to adjust the viscosity of the emulsion to 12s. At this time, the amount of N-methylpyrrolidone added accounted for 4.5% of the total mass of the prepolymer A and the mixed solution B. At room temperature, increase the rotation speed to 2000 rpm, raise the temperature to 40°C, and keep it for 1 hour.

[0031] 4. Reduce to normal temperature, vacuumize (-0.08MPa) and distill under reduced pressure to remove the organic solvent, finally add 0.015 kg of 1,2-benzisothia...

Embodiment 2

[0034] 1. Add 5.6 kg of polycarbonate diol and 0.8 kg of dimethylol butyric acid to the reaction vessel, and feed N 2 protection, stirring and raising the temperature to 75° C., adding 3.6 kg of tetramethylxylylene diisocyanate and reacting for 1.2 hours to prepare prepolymer A.

[0035] 2. Dissolve 0.12 kg of ethylenediamine and 0.8 kg of triethylamine in 27.45 kg of water to form mixed solution B.

[0036] 3. Slowly add the mixed solution B to the prepolymer A, and add 1.6 kg of N-methylpyrrolidone to adjust the viscosity of the emulsion to 14s. Wherein, the addition amount of N-methylpyrrolidone accounts for 4.2% of the total mass of the prepolymer A and the mixed solution B. At room temperature, increase the rotation speed to 2100 rpm, raise the temperature to 42°C, and keep it for 2 hours.

[0037] 4. Reduce to normal temperature, vacuumize (-0.08MPa) and distill under reduced pressure to remove the organic solvent, finally add 0.032 kg of 1,2-benzisothiazol-3-one, stir...

Embodiment 3

[0040] 1. Add 4.8 kilograms of polycaprolactone diols, 4.8 kilograms of polycarbonate diols, and 1.5 kilograms of 1,4-butanediol-2-sodium sulfonate in the reaction vessel, feed N 2 protection, stirring and raising the temperature to 78°C, adding 6 kg of hexamethylene diisocyanate and reacting for 1.5 hours to prepare prepolymer A.

[0041] 2. Dissolve 0.3 kg of hydrazine and 1.5 kg of triethylamine in 38.52 kg of water to form mixed solution B.

[0042] 3. Slowly add the mixed solution B into the prepolymer A, and add 2.52 kg of N-methylpyrrolidone to adjust the viscosity of the emulsion to 16s. Wherein, the addition amount of N-methylpyrrolidone accounts for 4.4% of the total mass of the prepolymer A and the mixed solution B. At room temperature, increase the rotation speed to 2300 rpm, raise the temperature to 43°C, and keep it for 2.2 hours.

[0043] 4. Reduce to normal temperature, vacuumize (-0.08MPa) and distill under reduced pressure to remove the organic solvent, final...

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Abstract

The invention relates to a waterborne polyurethane primer for coating a plastic film. The primer is prepared from the following raw materials in percentage by weight: 8 to 10 percent of diisocyanate, 12 to 16 percent of polyester polyol, 1 to 2.7 percent of hydroxycarboxylic acid compound, 2.3 to 4.2 percent of N-methyl ketopyrrolidine, 0.05 to 0.19 percent of preservative, 0.1 to 1.25 percent of chain extender, 1 to 3.13 percent of neutralizer and 73.9 to 80.7 percent of deionized water. Compared with the conventional waterborne polyurethane primer, the waterborne polyurethane primer has the advantages that after the waterborne polyurethane primer and a functional coating are coated sequentially, the waterborne polyurethane primer is high in bonding force (which can reach 2N/15mm), attractive in appearance, environment-friendly and safe, does not contain solvent residues and is particularly suitable for the field of coated films, and the adhesive force of the coating is high.

Description

technical field [0001] The invention relates to a water-based polyurethane primer suitable for coating plastic films and a manufacturing method thereof, belonging to the field of new polymer materials. Background technique [0002] Polyurethane is widely used in coatings, adhesives and plastics industries due to its excellent properties such as elasticity, abrasion resistance, impact resistance and tensile properties. As an adhesive, polyurethane also plays an important role in the field of film coating. Before applying functional coatings, it is necessary to coat a layer of adhesive primer to enhance the adhesion of functional coatings (such as modified polyvinyl alcohol, polyvinylidene chloride and acrylic coatings) on the substrate. However, the coating primer currently used in the market is mainly solvent-based polyurethane, which must be diluted with a large amount of organic solvents such as ethyl acetate, which causes the coating workshop to be full of organic volati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C08G18/66C08G18/44C08G18/42C08G18/12
Inventor 朱清梅胡连芹
Owner HAINAN SHINER IND
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