A kind of preparation method and application of high temperature resistant lye waterborne polyurethane coating

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

Active Publication Date: 2021-01-15
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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  • A kind of preparation method and application of high temperature resistant lye waterborne polyurethane coating
  • A kind of preparation method and application of high temperature resistant lye waterborne polyurethane coating
  • A kind of preparation method and application of high temperature resistant lye waterborne polyurethane coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the high-temperature-resistant lye water-based polyurethane coating is first introduced into the polyurethane with epoxy resin and double bonds to realize copolymerization with acrylate monomers, and the high-temperature-resistant lye is prepared by self-emulsification of the matrix resin in water Water-based polyurethane emulsion, a high-temperature alkali-resistant water-based polyurethane coating obtained after adding additives, the preparation process specifically includes the following steps:

[0035] 1. At 110°C, vacuum dewater 12 parts by mass of epoxy resin EP44 and 37 parts by mass of polycarbonate diol (Mn=2000) in the container for 1 hour; lower the temperature of the system to 85°C, and add 23 parts by mass Parts 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 was added to continue the reaction for 1 hour, and finally the temperature was lowered to 60...

Embodiment 2

[0042] In this embodiment, the high-temperature-resistant lye water-based polyurethane coating is first introduced into the polyurethane with epoxy resin and double bonds to realize copolymerization with acrylate monomers, and the high-temperature-resistant lye is prepared by self-emulsification of the matrix resin in water Water-based polyurethane emulsion, a high-temperature alkali-resistant water-based polyurethane coating obtained after adding additives, the preparation process specifically includes the following steps:

[0043]1. At 110°C, vacuum dewater 18 parts by mass of epoxy resin EP12 and 25 parts by mass of polycarbonate diol (Mn=1000) in the container for 1 hour; lower the temperature of the system to 80°C, and add 20 mass parts Parts 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 was added to continue the reaction for 1 hour, and finally the temperature was lowered to 60°C, ...

Embodiment 3

[0050] In this embodiment, the high-temperature-resistant lye water-based polyurethane coating is first introduced into the polyurethane with epoxy resin and double bonds to realize copolymerization with acrylate monomers, and the high-temperature-resistant lye is prepared by self-emulsification of the matrix resin in water Water-based polyurethane emulsion, a high-temperature alkali-resistant water-based polyurethane coating obtained after adding additives, the preparation process specifically includes the following steps:

[0051] 1. At 110°C, vacuum dewater 13 parts by mass of epoxy resin EP44 and 40 parts by mass of polycarbonate diol (Mn=1000) in the container for 1 hour; lower the temperature of the system to 80°C, and add 18 mass parts Parts of hexamethylene diisocyanate reacted with 6 parts by mass of dimethylolpropionic acid for 3 hours, then added 6 parts by mass of 1,4 butanediol to continue the reaction for 1 hour, and finally lowered the temperature to 60°C, and ad...

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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, specifically a preparation method and application of a high-temperature-resistant lye water-based polyurethane coating, which is suitable for the processing and treatment of paper, so as to improve the printability and high-temperature alkali resistance of the paper surface It can also improve the hardness, folding resistance and gloss of the paper. Background technique [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 it needs to be coated and processed to meet the use requirements. At present, the commonly used paper coatings on the market are usually oil-soluble polyurethane, polyacrylate and polyvinyl acetate. These coatings have serious problems of solvent volatilization...

Claims

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Application Information

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Patent Type & Authority Patents(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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