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Water-based coating for backing of packaging paper before printing and preparation method of coating

A water-based paint and wrapping paper technology, applied to wrapping paper, paper coating, wrapping paper, etc., can solve the problems of ink printing inaccuracy, unfavorable quality control, inaccurate printing registration, etc., achieve low cost, easy quality control, The effect of simple ingredients

Inactive Publication Date: 2019-09-17
中山市海恒包装材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing pre-printing primers have complex components, which is not conducive to quality control; and there are unfavorable phenomena such as ink printing and poor firmness during UV offset printing, and electrostatic adsorption affects poor paper movement and inaccurate printing registration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of Styrene Copolymer

[0053] 1) After mixing 9.6g of emulsifier with 181.7g of deionized water, add 170g of butyl acrylate, 60g of methyl methacrylate, 100g of styrene, 80g of isooctyl acrylate, 10g of methacrylic acid, 30g of polyester acrylate and Glycidyl methacrylate 5g, emulsified for 40min to obtain a uniform and stable pre-emulsion;

[0054] 2) After mixing the remaining 2.4g emulsifier and 337.3g deionized water with 2g sodium bicarbonate, add 5% of the pre-emulsion, heat up to 80°C, add 0.75g of the initiator to react to obtain the seed emulsion;

[0055] 3) Add the remaining pre-emulsion and 2.25 g of the initiator to the seed emulsion synchronously, after the addition is completed, keep the temperature at 85° C. for 60 minutes, and then add 3 g of tert-butyl hydroperoxide and Heat 2g of Diaobai powder for 45 minutes, then cool down to 45°C, add 4g of defoamer, and filter to obtain the product.

[0056] Wherein, the emulsifier is 4g fatty alcoho...

Embodiment 2

[0068] Preparation of Styrene Copolymer

[0069] 1) After mixing 11.25g of emulsifier with 169.9g of deionized water, add 120g of butyl acrylate, 80g of methyl methacrylate, 130g of styrene, 40g of isooctyl acrylate, 15g of methacrylic acid, 20g of polyester acrylate and Glycidyl methacrylate 8g, emulsified for 30min to obtain a uniform and stable pre-emulsion;

[0070] 2) After mixing the remaining 3.75g of emulsifier and 389.3g of deionized water with 5.5g of sodium bicarbonate, add 2% of the pre-emulsion, heat up to 75°C, add 0.3g of initiator to react to obtain a seed emulsion ;

[0071] 3) Add the remaining pre-emulsion and 0.7 g of the initiator to the seed emulsion synchronously, after the addition is completed, keep the temperature at 83° C. for 80 minutes, and then add 0.5 g of tert-butyl hydroperoxide dropwise at 68° C. Keep warm with 3.8g of Diaobai powder for 30min, then cool down to 50°C, add 2g of defoamer, and filter to obtain.

[0072] Wherein, the emulsifie...

Embodiment 3

[0084] Preparation of Styrene Copolymer

[0085] 1) After mixing 10.2g of emulsifier with 227.4g of deionized water, add 150g of butyl acrylate, 70g of methyl methacrylate, 80g of styrene, 60g of isooctyl acrylate, 12g of methacrylic acid, 25g of polyester acrylate and Glycidyl methacrylate 6g, emulsified for 50min to obtain a uniform and stable pre-emulsion;

[0086] 2) After mixing the remaining 1.8g emulsifier and 341.1g deionized water with 3g sodium bicarbonate, add 4% of the pre-emulsion, heat up to 78°C, add 1.0g of initiator to react to obtain the seed emulsion;

[0087] 3) Add the remaining pre-emulsion and 4.0 g of the initiator to the seed emulsion synchronously, after the addition is completed, keep the temperature at 83° C. for 80 minutes, and then add 2.0 g of tert-butyl hydroperoxide dropwise at 72° C. Keep warm with 2.5g of Diaobai powder for 60min, then cool down to 40°C, add 4g of defoamer, and filter to obtain.

[0088] Wherein, the emulsifier is 4g fatty ...

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Abstract

The invention belongs to the technical field of coatings, and particularly relates to a water-based coating for backing of packaging paper before printing and a preparation method of the coating. The coating comprises the following raw materials: deionized water, alcohol, a styrene copolymer, acrylic resin and an auxiliary agent, wherein the styrene copolymer is obtained by polymerizing styrene and at least one monomer selected from the group consisting of butyl acrylate, methyl methacrylate, isooctyl acrylate, methacrylic acid, polyester acrylate and glycidyl methacrylate, and preparation monomers of the acrylic resin comprise butyl acrylate, methyl methacrylate, isooctyl acrylate, methacrylic acid, polyester acrylate and glycidyl methacrylate. The coating provided by the invention does not contain substances toxic to human bodies, such as benzene and methanol, has the advantages of good printing adaptability, good adhesion fastness, high surface brightness of a coating film and friction resistance, and is suitable for printing of paper products with high environmentally-friendly requirements, such as tobacco, wine, cosmetics and daily necessities.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a water-based coating for priming before printing of wrapping paper and a preparation method thereof. Background technique [0002] With the growth of the national economy, the demand for packaging and printing has also increased greatly. Due to its low pollution and recyclability, paper product packaging is widely used in the outer packaging of cosmetics, daily necessities, tobacco and wine and other products. As a high-grade printing paper, it must not only have environmental protection and good printing performance, but also put forward quite high requirements for the backing paper used for printed matter, that is, it must ensure that the backing paper used for printed matter has excellent smoothness, toughness, strength, Glossiness, various effects, hue, sensory, etc. There are many factors that affect the quality of packaging printing paper, including base paper, coating a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/10D21H19/20D21H21/14C08F283/01C08F220/14C08F220/06C08F220/18C08F220/32C08F212/08C08F2/26
CPCD21H27/10D21H19/20D21H21/14C08F283/01C08F2/26
Inventor 邓海玻
Owner 中山市海恒包装材料有限公司
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