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Water base varnish and preparation method thereof

A technology of water-based varnish and water-based auxiliaries, applied in textile and papermaking, non-fibrous pulp addition, papermaking, etc., can solve problems such as difficulty in meeting actual needs, increase product cost, and unfavorable anti-adhesion, and achieve excellent adhesion, Low cost and excellent compatibility

Active Publication Date: 2012-07-18
上海奇想青晨新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Paper glazing requires high gloss, high wear resistance, good adhesion, anti-explosion line (dry film flexibility) and good anti-blocking properties. However, it is difficult for the current commercially available water-based varnish products to meet the requirements, especially some properties. There will be mutual restraint between them. If high gloss is required, then the Tg of the coating film must be high, and the film-forming property of high Tg is not good. If it is required that the coating film has good adhesion to the paper substrate, then use low Tg emulsion can solve it, but general low Tg emulsion is not good for anti-adhesion
[0003] At present, the main solution to the above problems is to use conventional technical means, such as adding a large amount of film-forming aids, some even as high as 20%, to improve film-forming properties and ensure high gloss, but it is difficult to call it a true film. Water-based environmentally friendly glazing oil, the film-forming aid is a volatile organic component, a large amount of use will pollute the environment and increase product costs
There is also the method of physical blending of soft and hard resin liquids. This method seems to be very simple and practical, but there are many factors that affect the blending effect, such as the compatibility between resins, and the results are often difficult to predict. , it is also difficult to meet the actual demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 300 parts of core copolymer monomer (including 250 parts of methyl methacrylate, 32 parts of vinyl acetate, 6 parts of acrylic acid, 8 parts of 2-hydroxyethyl acrylate, and 4 parts of acrylamide) in the reactor, 300 parts Deionized water, 18 parts of compound emulsifier, 12 parts of sodium bicarbonate, N 2 , be warming up to 80 DEG C, dropwise add 9 parts of initiators (mass fraction is 20% potassium persulfate aqueous solution, control dropwise in 3 hours, after dropping, be warming up to 95 DEG C and heat preservation reaction for 1 hour. Then cool down to 70 DEG C, Then add 150 parts of shell copolymer monomer (90 parts of butyl acrylate and 60 parts of styrene), after adding shell copolymer monomer, start to drop 10 parts of initiator (mass fraction is 20% potassium persulfate aqueous solution) , control the dropwise addition in 4 hours, after the dropwise addition, the temperature is raised to 75°C and the temperature is kept for 1 hour. Then the temperature is...

Embodiment 2

[0039] The core copolymer monomers in Example 1 were adjusted to: 220 parts of methyl methacrylate, 60 parts of vinyl acetate, 8 parts of acrylic acid, 8 parts of 2-hydroxyethyl acrylate, and 4 parts of acrylamide. Other formulations and processes are the same as in Example 1, and a water-based varnish with a viscosity of 60 s for coating 4# cups at 25° C. is prepared.

[0040] The water-based glazing oil that this embodiment prepares, its various performances are as follows:

[0041] Gloss: 86%;

[0042] Solid content: 42%;

[0043] Adhesion: Level 1;

[0044] Abrasion resistance: level 1;

[0045] Bond strength ≥ 2.67N / 15mm.

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PUM

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Abstract

The invention relates to water base varnish, which is formed by mixing the following components in percentage by weight: 40-80% of strawberry type heterotypic nuclear / shell type emulsion, 7-50% of alkali soluble resin liquid, 8-20% of wax emulsion and 5-10% of aqueous adjuvant. The invention further provides a preparation method of the water base varnish. The water base varnish provided by the invention uses the strawberry type heterotypic nuclear / shell type emulsion and the alkali soluble resin liquid as main systems, is not necessary to be added with a film forming adjuvant externally, has favorable film forming property, compatibility and excellent base material adhesiveness, and has the characteristics of low carbon, environment friendliness and low cost; by using the water base varnish provided by the invention, the high gloss, the high abrasion resistance, the good adhesive force, the line explosion resistance and the conglutination resistance can be considered at one and the same time; and the water base varnish can be widely used for the polishing of various packaging paper products.

Description

technical field [0001] The invention relates to a water-based glazing oil and a preparation method thereof. Background technique [0002] Because of its non-toxic, harmless and environmentally friendly features, water-based varnish has become more and more popular among people and has become the main force in paper glazing. Paper glazing requires high gloss, high wear resistance, good adhesion, anti-explosion line (dry film flexibility) and good anti-blocking properties. However, it is difficult for the current commercially available water-based varnish products to meet the requirements, especially some properties. There will be mutual restraint between them. If high gloss is required, then the Tg of the coating film must be high, and the film-forming property of high Tg is not good. If it is required that the coating film has good adhesion to the paper substrate, then use low Tg emulsion can solve it, but general low Tg emulsion is not good for anti-adhesion. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/14C08F220/14C08F218/08C08F220/06C08F220/28C08F220/56C08F220/18C08F212/08C08F2/26
Inventor 刘检仔
Owner 上海奇想青晨新材料科技股份有限公司