Waterborne polyurethane, preparation method therefor and waterborne transfer painting

A technology for water-based polyurethane and transfer coatings, applied in the field of coatings, can solve the problems of environmental pollution, hidden dangers in production safety, and high cost and price of organic solvents

Inactive Publication Date: 2013-10-23
CHANGDE JINDE NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The transfer coatings currently used are all organic solvent-based, that is, oil-based coatings, which use various organic solvents such as: benzene, ketones, lipids, ethers, etc. as dispersion media. The above solvents are easy to volatilize and cause irritation and the volatile solvents cannot be recycled in large quantities, which not only causes waste but also pollutes the environment, and brings safety hazards t

Method used

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  • Waterborne polyurethane, preparation method therefor and waterborne transfer painting
  • Waterborne polyurethane, preparation method therefor and waterborne transfer painting
  • Waterborne polyurethane, preparation method therefor and waterborne transfer painting

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preparation example Construction

[0022] The embodiment of the present invention discloses a kind of preparation method of waterborne polyurethane, comprises the following steps:

[0023] A) reacting isophorone diisocyanate with polyester diol to obtain a prepolymer;

[0024] B) performing chain extension reaction after mixing the prepolymer, alcohol chain extender and hydrophilic chain extender;

[0025] C) Mix the compound and salt-forming agent obtained in step B) with water, and react to obtain water-based polyurethane.

[0026] The invention provides a method for preparing water-based polyurethane. According to the invention, before preparing the water-based polyurethane, raw materials are strictly selected.

[0027] Aromatic water-based polyurethane is similar to oil-based polyurethane, which has obvious yellowing and poor weather resistance, and is a low-end popular product; aliphatic water-based polyurethane has good color retention and weather resistance, but the price is high, and it is a high-end p...

Embodiment 1

[0049] Distill 200g of polycaprolactone diol at 130°C for 2h and then cool down to room temperature, add 150g of isophorone diisocyanate and 2g of stannous octoate to react at 80-140°C for 2-3h, After cooling down, add 15g of dimethylolpropionic acid and 10g of 1,4-butanediol and continue the reaction for 4 to 8 hours, then cool down and add 20g of triethylamine and 50g of N-methylpyrrolidone as salt forming agents, and finally add 553g of deionized water to carry out Chain extension to obtain water-based polyurethane.

Embodiment 2

[0051] Distill 160g of polycaprolactone diol at 130°C for 2h and then cool down to room temperature, add 180g of isophorone diisocyanate and 5g of stannous octoate to react at 80-140°C for 2-3h, After cooling down, add 20g of dimethylolpropionic acid and 15g of 1,4-butanediol and continue the reaction for 4 to 8 hours, then cool down and add 25g of triethylamine and 55g of N-methylpyrrolidone as salt-forming agents, and finally add 540g of deionized water to carry out Chain extension to obtain water-based polyurethane.

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Abstract

The invention provides a preparation method for waterborne polyurethane. The preparation method comprises the following steps: (A) isophorone diisocyanate and polyester dihydric alcohol are reacted to obtain prepolymers; (B) the prepolymers, alcohol chain extenders and hydrophilic chain extenders are mixed and subjected to chain extension; (C) the compounds obtained from the step (B), salt forming agents and water are mixed and reacted to obtain waterborne polyurethane. The waterborne polyurethane is prepared through an internal emulsification method and has good hydrophilicity because the waterborne polyurethane contains hydrophilic groups. The invention also provides a waterborne transfer painting. The waterborne transfer painting comprises waterborne polyurethane, deionized water, antifoaming agents, wetting dispersants, flatting agents and antiseptics. The waterborne transfer painting employs waterborne polyurethane as a waterborne transfer resin. Because hydrophilic groups are introduced into polyurethane macromolecule, The waterborne transfer painting is soluble in water. The waterborne transfer painting employs deionized water as a dispersion medium, so the waterborne transfer painting has high safety and environmental protection.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to water-based polyurethane, a preparation method thereof and water-based transfer coatings. Background technique [0002] The early gold and silver cardboard used in the packaging boxes of tobacco, wine, food, daily necessities, etc. was mainly produced by the composite method, that is, the aluminum foil or aluminized film is directly composited with the paper. Although the process is simple, the aluminum foil and plastic film in the product cannot be degraded and Recycling causes environmental pollution and a large waste of resources. In order to protect the environment and save resources, people have developed a direct plating process and a transfer process. [0003] The direct plating method is to directly vapor-deposit the paper with a vacuum aluminum plating machine, but there are many problems, for example: the moisture content of the paper changes greatly when the aluminum...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/42C08G18/32C08G18/34C08G18/10C09D175/06C09D7/12
Inventor 余赞白永平陆仕稳
Owner CHANGDE JINDE NEW MATERIAL TECH CO LTD
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