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Preparation method of epoxy-modified polyurethane packaging coating

A technology of epoxy modification and polyurethane, which is applied in the field of packaging and decoration, can solve the problems of low coating film strength, single protective performance, and poor peelability, so as to improve water resistance and mechanical properties, avoid particle agglomeration, and improve stability. Effect

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
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  • 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

[0023] The preparation method of epoxy-modified polyurethane packaging coating comprises the following steps:

[0024] 1) Add butanone to the flask containing epoxy resin, stir and mix at a speed of 150~200r / min for 10~30min to obtain an epoxy resin-butanone solution for later use; add to the first reaction kettle at room temperature Toluene diisocyanate, polypropylene glycol, polyethylene glycol, dibutyltin dilaurate, triethylamine and methyl ethyl ketone, then raise the temperature to 58~70°C, let them mix and react into the system in the first reactor-NCO % value no longer changes, get the primary product, standby;

[0025] 2) Control the temperature at 80°C, add dimethylolpropionic acid to the primary product obtained in step 1) and react for 100~130min, then add the epoxy resin-butanone solution obtained in step 1) and react for 100~130min ; then lower the temperature to 38~43°C, add triethylamine to obtain the secondary product; add the secondary product to the second rea...

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Abstract

The invention discloses a preparation method of an epoxy-modified polyurethane packaging coating. The preparation method comprises the following processes: (1) preparing an epoxy resin-butanone solution; adding toluene diisocynate and the like into a first reaction kettle to obtain a primary product; (2) adding dimethylolpropionic acid into the primary product, and then adding triethylamine to prepare epoxy-modified aromatic polyurethane emulsion; (3) adding silica sol and the epoxy-modified aromatic polyurethane emulsion into a third reaction kettle at the room temperature to obtain mixed emulsion for later use; (4) adding right amount of acrylic copolymer potassium salt and the like into a fourth reaction kettle filled with distilled water to obtain a mixed base solution; (5) adding the mixed emulsion into the mixed base solution to obtain the epoxy-modified polyurethane packaging coating. The epoxy-modified polyurethane packaging coating prepared by the method has excellent water resistance, higher stability, stronger cohesion, good strippable property and higher coating strength.

Description

technical field [0001] The invention relates to the field of packaging and decoration, in particular to a preparation method of epoxy-modified polyurethane packaging 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 ...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D7/12C08G18/48C08G18/76C08G18/24C08G18/18C08G18/66C08G18/32C08G18/58
Inventor 谭春芳
Owner 重庆市共赢包装制品有限公司
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