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Preparation method for ultraviolet curing water-based paper varnish

A technology of water-based varnish and ultraviolet light, which is applied in the field of polymer chemistry, can solve the problems of difficult active monomers, harmful environment and human health, and the impact of long-term performance and safety indicators of printed materials, and achieves short curing time, simple equipment, and recycling. The effect that recycling processing is easy

Active Publication Date: 2015-03-18
陕西润泰化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since most of the varnishes currently used in China are solvent-based, it is inevitable to use acrylate reactive diluent monomers in the formula, some of which may be harmful to the environment and human health
In addition, paper is a kind of porous adsorption medium. During the coating and curing process, it is difficult for the active monomer to react completely, and it is easy to absorb and remain in the paper fiber layer, which will have a negative impact on the long-term performance of printed matter and the safety indicators of the environment.

Method used

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  • Preparation method for ultraviolet curing water-based paper varnish

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Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of ultraviolet curing water-based varnish for paper is realized by the following steps:

[0043] Step 1: Add 10.8 parts by weight of polymer polyol to the drying reactor, and after vacuum degassing at 110°C, cool down to 50°C, add 7.63 parts by weight of isocyanate monomer into the reactor, and carry out at 70°C Polymerization, the reaction time is 1h.

[0044] Wherein, polymer polyol selects the polyoxypropylene glycol that relative molecular mass is 1000;

[0045] Isocyanate monomer is selected from isophorone diisocyanate.

[0046] Step 2: Add 0.68 parts by weight of a hydrophilic chain extender to the reactor and react at 60°C for 2 hours;

[0047] Wherein, the hydrophilic chain extender is selected from dimethylol propionic acid.

[0048] Step 3: Cool down to 50°C, add 1.62 parts by weight of functional monomers, react for 2 hours, cool down to 15°C, add an organic base to adjust the pH of the reaction system to 7, add deionized water and ...

Embodiment 2

[0057] The preparation method of ultraviolet curing water-based varnish for paper is realized by the following steps:

[0058] Step 1: Add 10.8 parts by weight of polymer polyol to the drying reactor, and after vacuum degassing at 110°C, cool down to 50°C, add 8.63 parts by weight of isocyanate monomer into the reactor, and carry out at 75°C Polymerization, the reaction time is 1h.

[0059] Wherein, polymer polyol selects the polyoxypropylene glycol that relative molecular mass is 1000;

[0060] The isocyanate monomer is toluene diisocyanate.

[0061] Step 2: Add 1.10 parts by weight of a hydrophilic chain extender to the reactor and react at 60°C for 2 hours;

[0062] Wherein, the hydrophilic chain extender is selected from dimethylol butyric acid.

[0063] Step 3: Cool down to 50°C, add 2.27 parts by weight of functional monomers, react for 2 hours, cool down to 15°C, add an organic base to adjust the pH of the reaction system to 7, add deionized water and polymer seed la...

Embodiment 3

[0072] The preparation method of ultraviolet curing water-based varnish for paper is realized by the following steps:

[0073] Step 1: Add 10.8 parts by weight of polymer polyol to the dry reactor, and after vacuum degassing at 110°C, cool down to 55°C, add 9.63 parts by weight of isocyanate monomer into the reactor, and carry out the process at 75°C Polymerization, the reaction time is 2h.

[0074] Wherein, polymer polyol selects polytetrahydrofuran ether diol;

[0075] The isocyanate monomer is selected from hexamethylene diisocyanate.

[0076] Step 2: Add 1.52 parts by weight of a hydrophilic chain extender to the reactor and react at 65°C for 3 hours;

[0077] Wherein, the hydrophilic chain extender is a mixture of dimethylolpropionic acid and sodium ethylenediaminoethanesulfonate in a mass ratio of 1:0.2.

[0078] Step 3: Cool down to 50°C, add 2.92 parts by weight of functional monomers, react for 3 hours, cool down to 20°C, add an organic base to adjust the pH of the...

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Abstract

The invention relates to a preparation method for an ultraviolet curing water-based paper varnish. Most of ultraviolet curing paper varnishes are solvent type varnishes, acrylic ester active dilute monomers are inevitably used in a formula, and certain monomers are possibly harmful to the environment and the human health. The preparation method comprises the steps as follows: carrying out vacuum degassing on polymer polyol, cooling, and adding isocyanate monomers for polymerization reaction; adding a hydrophilic chain extender for reaction; cooling, adding functional monomers for reaction, adjusting the pH value of a reaction system, adding a mixture of de-ionized water and polymeric seed latex for emulsification to prepare a photo-curing water-based polyurethane-acrylate emulsion; and adding a photoinitiator, a defoaming agent and a leveling agent to prepare the ultraviolet curing water-based paper varnish. According to the preparation method, an active diluent in the conventional varnish is replaced with water, volatile organic compounds are prevented being generated in the paper operation environment, and the full green and environment-friendly effect can be achieved.

Description

technical field [0001] The invention belongs to the field of macromolecule chemistry, and in particular relates to a preparation method of ultraviolet-cured water-based varnish for paper. Background technique [0002] The UV curing and glazing process of paper products is to apply a layer of colorless and transparent paint on the surface of the printed matter by roller coating (or spraying, printing), and form a thin and uniform coating on the surface of paper or cardboard after leveling, UV curing, and calendering. The transparent bright layer, after the paper product is polished, increases the surface gloss, smoothness, wear resistance and water resistance, and can protect the printed graphics, so it is widely used in packaging and decoration, albums, large Surface processing of printed matter such as decoration and advertisement. [0003] UV-curable paper varnish is a printing chemical for surface treatment of paper or cardboard to obtain high gloss, abrasion resistance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/24D21H21/12D21H21/06C08F283/00C08F220/28C08F222/20C08G18/66
Inventor 赖小娟王磊杜媛宋远波
Owner 陕西润泰化工科技有限公司