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Preparation method of waterborne polyurethane coating

A water-based polyurethane and coating technology, applied in the field of packaging and decoration, can solve the problems of single protection performance, low coating film strength, poor peelability, etc., and achieve the effects of improving mechanical properties and water resistance, improving mechanical strength and improving dispersion.

Inactive Publication Date: 2017-06-09
重庆市共赢包装制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing water-based protective coatings still have the disadvantages of low film strength, poor peelability and single protective performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of water-based polyurethane paint comprises following steps:

[0028] 1) Add isophorone diisocyanate, polypropylene glycol, polyethylene glycol, dibutyltin dilaurate and butanone to the first reaction kettle at room temperature, and then raise the temperature to 58~80°C to make them Mix and react in the reactor until the value of -NCO% in the system does not change, and obtain the primary product for subsequent use;

[0029] 2) Control the temperature at 80°C, add dimethylol propionic acid to the primary product obtained in step 1) and react for 220~260min, then lower the temperature to 38~43°C, add triethylamine to obtain the secondary product ; Add secondary products to the second reaction kettle filled with distilled water and disperse the secondary products in distilled water, then add diethylenetriamine aqueous solution to obtain aliphatic water-based polyurethane emulsion;

[0030] 3) Add propyltrimethoxysilane to the flask filled with etha...

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Abstract

The invention discloses a preparation method of waterborne polyurethane coating. The preparation method comprises the following procedures: 1) adding isophorone diisocyanate and the like into a first reaction kettle at room temperature to obtain a primary product; 2) adding dihydromethyl propionic acid into the primary product and adding triethylamine to prepare aliphatic waterborne polyurethane emulsion; 3) preparing modified silica sol; 4) adding the aliphatic waterborne polyurethane emulsion and the modified silica sol into a third reaction kettle at room temperature to obtain mixed emulsion; 5) adding a proper amount of an acrylic copolymer potassium salt and the like into a fourth reaction kettle containing distilled water to obtain a mixed base solution; 6) adding the mixed emulsion into the mixed base solution to obtain the waterborne polyurethane coating. The coating prepared by the preparation method can be used for carrying out effective sealed protection on a protected object and preventing the protected object from being polluted, corroded and damaged. Meanwhile, the coating also has the advantages of good strippable property, high film coating strength, high cohesive force and high stability.

Description

technical field [0001] The invention relates to the field of packaging and decoration, in particular to a preparation method of water-based polyurethane paint. Background technique [0002] In order to prevent the materials or semi-products exposed to the atmosphere from being polluted, corroded and damaged, and prolong their service life, they are usually coated with good protective and peelable coatings on their surfaces for effective and temporary maintenance. Archive protection. In this way, it can not only isolate the invasion of air, salt spray, and microorganisms from the outside to achieve anti-corrosion effect; but also achieve the effect of cleaning and decontamination by adsorbing pollutants. Compared with solvent-based protective coatings, water-based protective coatings are safer and more environmentally friendly, so they are widely used in the field of product packaging and decoration. However, the existing water-based protective coatings still have the disa...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D7/12C08G18/66C08G18/48C08G18/34
Inventor 谭春芳
Owner 重庆市共赢包装制品有限公司
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