Covering rheological agent and preparation method thereof

A rheological agent and hiding technology, applied in the direction of pigmented coatings, coatings, paper coatings, etc., can solve the problems of poor water retention, low hiding, and poor rheological properties of paper coatings, so as to improve water retention and avoid Flocculation and precipitation, enhance the effect of stress resistance

Inactive Publication Date: 2019-09-13
NINGBO JIAHUA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is the defects of poor rheological properties, low hiding properties and poor water retention of papermaking coatings in the prior art.

Method used

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  • Covering rheological agent and preparation method thereof
  • Covering rheological agent and preparation method thereof
  • Covering rheological agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The opacifying rheological agent provided by the present embodiment has a preparation method as follows:

[0042] Add 60 parts of deionized water, 5 parts of cationic monomer dimethyl diallyl ammonium chloride, 1 part of anionic monomer acrylic acid, 30 parts of hard monomer styrene, 2 parts of crosslinking monomer methyl Hydroxyethyl acrylate, 0.2 part of chain transfer agent mercaptoethanol, 0.4 part of nonionic surfactant alkylphenol polyoxyethylene ether, 0.1 part of reducing agent sodium sulfite, 0.8 part of pH buffer agent sodium bicarbonate, start stirring and mixing evenly, and heat to 60°C, keep warm for 10-20 minutes;

[0043] Increase the stirring speed, and raise the temperature to 90°C, and keep it warm for 10-20 minutes;

[0044]Reduce the stirring speed, add 25% of the total amount of initiator (0.2 parts of ammonium persulfate and potassium persulfate 1:1 mixture) (that is, 0.05 parts of ammonium persulfate and potassium persulfate 1:1 mixture), start t...

Embodiment 2

[0050] Add 60 parts of deionized water, 6 parts of cationic monomer dimethyl diallyl ammonium chloride, 1 part of anionic monomer acrylic acid, 28 parts of hard monomer styrene, 3 parts of crosslinking monomer methyl Hydroxyethyl acrylate, 0.2 part of chain transfer agent mercaptoethanol, 0.6 part of nonionic surfactant alkylphenol polyoxyethylene ether, 0.1 part of reducing agent sodium sulfite, 0.6 part of pH buffer agent sodium bicarbonate, start stirring and mixing evenly, and heat to 60°C, keep warm for 10-20 minutes;

[0051] Increase the stirring speed, and raise the temperature to 90°C, and keep it warm for 10-20 minutes;

[0052] Reduce the stirring speed, add 25% of the total amount of initiator (0.2 parts of ammonium persulfate and potassium persulfate 1:1 mixture) (that is, 0.05 parts of ammonium persulfate and potassium persulfate 1:1 mixture), start the reaction and keep the temperature stable;

[0053] After reacting for 60 minutes, add 25% of the total amount ...

Embodiment 3

[0058] Add 60 parts of deionized water, 8 parts of cationic monomer dimethyl diallyl ammonium chloride, 0.5 parts of anionic monomer acrylic acid, 25 parts of hard monomer styrene, 4 parts of crosslinking monomer methyl Hydroxyethyl acrylate, 0.4 part of chain transfer agent mercaptoethanol, 0.7 part of nonionic surfactant alkylphenol polyoxyethylene ether, 0.1 part of reducing agent sodium sulfite, 0.7 part of pH buffer agent sodium bicarbonate, start stirring and mixing evenly, and heat to 60°C, keep warm for 10-20 minutes;

[0059] Increase the stirring speed, and raise the temperature to 90°C, and keep it warm for 10-20 minutes;

[0060] Reduce the stirring speed, add 25% (ie 0.075 parts of ammonium persulfate and potassium persulfate 1:1 mixture) of the total amount of initiator (0.3 parts of ammonium persulfate and potassium persulfate 1:1 mixture), start the reaction and keep the temperature stable;

[0061] After reacting for 60 minutes, add 25% of the total amount of...

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Abstract

The invention discloses a covering rheological agent. The covering rheological agent comprises, in terms of the total mass percentage of the rheological agent, 3-8% of a cationic monomer, 1-3% of an anionic monomer, 25-35% of a hard monomer, 1-5% of a cross-linking monomer, 0.1-0.4% of a chain transfer agent, 0.25-0.8% of a nonionic surfactant, 0.1-0.3% of an initiator, 0.02-0.1% of a reducing agent, 0.6-1% of a pH buffer and 0.1-0.4% of a preservative, with the balance being water. The invention also discloses a preparation method for the above-mentioned covering rheological agent. The preparation method comprises the following steps: adding the main components except the initiator and the preservative into a reaction kettle, performing uniform mixing, and then carrying out heating; adding the initiator in four stages, wherein 1 / 4 of the initiator is added in each stage, carrying out a reaction and controlling temperature; and finally performing cooling to prepare the covering rheological agent. The preparation method of the invention is simple, can greatly improve the dispersibility, rheological performance, operation stability of mineral pigment particles in a coating, and enhances the covering power and the like of the coating, thereby improving the surface gloss, smoothness and whiteness of coated paper and lowering paint cost at the same time.

Description

technical field [0001] The invention relates to a covering rheological agent, in particular to a dispersed rheological agent used in high-content calcium carbonate papermaking coatings. Background technique [0002] With the progress of the times and the increasing demand of people, the demand for packaging paper is becoming more and more high-end. The difference between high-end and low-end packaging paper, apart from the paper substrate, is mainly the smoothness of its surface. The factors that affect the smoothness of the surface are mainly the roughness of the surface paper, the flow and leveling of the paint, and the pseudo-fluidity (high viscosity at low shear, low viscosity at high shear). The main components of paper coatings are pigments, adhesives, rheological agents, dispersants, lubricants, water repellants, defoamers, etc. The rheological agent in it plays a very important role in the running performance of the coating and the coating effect of the coating. T...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F226/02C08F220/06C08F220/20D21H19/38D21H19/58
CPCC08F212/08D21H19/385D21H19/58C08F226/02C08F220/06C08F220/20
Inventor 夏春生千胜宇葛政台
Owner NINGBO JIAHUA NEW MATERIAL TECH CO LTD
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