Preparation method and application of high-temperature-resistant alkali liquor waterborne polyurethane coating

A technology of water-based polyurethane and high temperature resistance, applied in the field of water-based polyurethane, can solve the problems of poor printability, easy dispersion of ink, poor mechanical properties, etc., and achieve the goal of improving gloss, improving poor medium resistance, and improving gloss Effect

Active Publication Date: 2018-08-10
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Because the base paper has not been processed and modified, it usually has poor mechanical properties, and because the cellulose is easy to absorb water and ink, the ink is easily dispersed when the surface is printed, resulting in extremely poor printability. Usually need to be coated and processed to meet the use requirements

Method used

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  • Preparation method and application of high-temperature-resistant alkali liquor waterborne polyurethane coating
  • Preparation method and application of high-temperature-resistant alkali liquor waterborne polyurethane coating
  • Preparation method and application of high-temperature-resistant alkali liquor waterborne polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, the high-temperature-resistant alkali-liquid water-based polyurethane coating is first introduced into the polyurethane with epoxy resin and double bonds to achieve copolymerization with acrylic monomers, and the high-temperature-resistant alkali is prepared by self-emulsification of the matrix resin in water The preparation process of the water-based polyurethane emulsion and the high-temperature-resistant alkali-liquid water-based polyurethane coating obtained by adding additives includes the following steps:

[0035] 1. At 110°C, 12 parts by mass of epoxy resin EP44 and 37 parts by mass of polycarbonate diol (Mn=2000) were vacuumed in the container to remove water for 1 hour; the temperature of the system was reduced to 85°C, and 23 parts by mass were added Part of isophorone isocyanate was reacted with 8 parts by mass of dimethylolpropionic acid for 2 hours, then 6 parts by mass of 1,4 butanediol were added to continue the reaction for 1 hour, and final...

Embodiment 2

[0042] In this example, the high-temperature-resistant alkali-liquid water-based polyurethane coating is first introduced into the polyurethane with epoxy resin and double bonds to achieve copolymerization with acrylic monomers, and the high-temperature-resistant alkali is prepared by self-emulsification of the matrix resin in water The preparation process of the water-based polyurethane emulsion and the high-temperature-resistant alkali-liquid water-based polyurethane coating obtained by adding additives includes the following steps:

[0043] 1. At 110°C, 18 parts by mass of epoxy resin EP12 and 25 parts by mass of polycarbonate diol (Mn=1000) were vacuumed in the container to remove water for 1 hour; the temperature of the system was reduced to 80°C, and 20 parts by mass were added Part of isophorone isocyanate was reacted with 7 parts by mass of dimethylolpropionic acid for 2 hours, then 6 parts by mass of 1,4 butanediol were added to continue the reaction for 1 hour, and final...

Embodiment 3

[0050] In this example, the high-temperature-resistant alkali-liquid water-based polyurethane coating is first introduced into the polyurethane with epoxy resin and double bonds to achieve copolymerization with acrylic monomers, and the high-temperature-resistant alkali is prepared by self-emulsification of the matrix resin in water The preparation process of the water-based polyurethane emulsion and the high-temperature-resistant alkali-liquid water-based polyurethane coating obtained by adding additives includes the following steps:

[0051] 1. At 110°C, 13 parts by mass of epoxy resin EP44 and 40 parts by mass of polycarbonate diol (Mn=1000) were vacuumed to remove water in the container for 1 hour; the temperature of the system was reduced to 80°C, and 18 parts by mass were added Parts of hexamethylene diisocyanate and 6 parts by mass of dimethylolpropionic acid were reacted for 3 hours, and then 6 parts by mass of 1,4 butanediol were added to continue the reaction for 1 hour,...

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Abstract

The invention discloses a preparation method and application of a high-temperature-resistant alkali liquor waterborne polyurethane coating. Firstly, molecular design and process optimization are usedto realize the copolymerization of alkali-resistant epoxy-acrylate-polyurethane and self-emulsification in water, and relevant additives are then added, so that a waterborne polyurethane coating is obtained; the surface of packaging paper is coated with the waterborne polyurethane coating, so that a polyurethane coating with a high-temperature-resistant sodium hydroxide solution is formed on the surface of the paper; after ink is printed on the surface of the paper, the coating can be maintained not to be degraded and the ink can be maintained not to be peeled off when the paper is soaked in 2% sodium hydroxide solution for 20min at the temperature of 85 DEG C; furthermore, the hardness, gloss and folding resistance of the paper can be significantly improved; after the paper is coated withthe waterborne polyurethane coating, the hardness of the paper is increased to 5H from HB, the gloss of the paper is improved by about 261%, and the folding resistance of the paper is increased by 178%.

Description

Technical field [0001] The invention relates to a water-based polyurethane, in particular to a preparation method and application of a high-temperature-resistant alkali-liquid water-based polyurethane coating, which is suitable for paper processing and treatment to improve the printability of the paper surface and the high-temperature alkali resistance The purpose of the paper, but also can improve the paper's hardness, folding resistance and gloss. Background technique [0002] Because the base paper has not been processed and modified, its mechanical properties are usually poor, and because the cellulose is easy to absorb water and ink, the ink is easily dispersed when printing on its surface, resulting in extremely poor printability. These two points lead to the base paper Usually need to be coated to meet the requirements of use. At present, the commonly used paper coatings on the market are usually oil-soluble polyurethane, polyacrylate and polyvinyl acetate. These coatings...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/32C08G18/34C08G18/38C08G18/44C08G18/58C08G18/67D21H19/24
CPCC08G18/3206C08G18/3228C08G18/3275C08G18/348C08G18/3855C08G18/44C08G18/58C08G18/664C08G18/6651C08G18/6655C08G18/6659C08G18/672D21H19/24
Inventor 丁运生汪逸航徐梁峰江晓飞李嘉晋孙晓红
Owner HEFEI UNIV OF TECH
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