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Viscosity reducer, preparation method thereof, and paper coating

A technology of viscosity reducer and slurry, which is applied in paper coating, paper, textile and papermaking, etc. It can solve the problems of coating streaks, viscosity increase, drying on rollers, etc., and achieve high shear viscosity reduction and good viscosity reduction Effect, effect of dispersion and precipitation

Active Publication Date: 2019-04-30
深圳市瑞成科讯实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet this development trend, the paper machine is usually required to run faster during the coating process, and the coating speed is increased, which will cause high shear. However, the viscosity of the coating will increase significantly under high shear, which will affect the paper quality.
The traditional viscosity reducer is not ideal for reducing the viscosity of the coating under high shear conditions, which may easily cause problems such as drying on the roller and coating streaks, which will affect the actual use effect of the paper

Method used

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  • Viscosity reducer, preparation method thereof, and paper coating
  • Viscosity reducer, preparation method thereof, and paper coating
  • Viscosity reducer, preparation method thereof, and paper coating

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preparation example Construction

[0037] The present invention provides the preparation method of the viscosity reducer described in the above technical scheme, comprising the following steps:

[0038] (1) Mix functional monomers, maleic anhydride, part of itaconic acid, part of reducing agent and water, and mix at 78-85°C to obtain the first slurry;

[0039] (2) Mix the first slurry with part of acrylic acid and part of oxidant, keep it warm at 75-85°C for 2.5-3.5 hours, and carry out polymerization reaction to obtain the second slurry;

[0040] (3) mixing the second slurry with the remaining itaconic acid, the remaining reducing agent, the remaining acrylic acid and the remaining oxidizing agent, keeping the temperature at 75-85° C. for 2.5-3.5 hours, and performing a polymerization reaction to obtain the third slurry;

[0041] (4) Mixing the third slurry with an inorganic base to obtain a viscosity reducer.

[0042] The present invention mixes functional monomers, maleic anhydride, part of itaconic acid, p...

Embodiment 1

[0055] In terms of parts by weight, put 62.5 parts of allyl polyoxyethylene ether in a four-necked flask, raise the temperature to 80°C, make it melt, then add 200 parts of water, heat to 80°C, and then add 25 parts of maleic anhydride , 22.5 parts of itaconic acid, 6.4 parts of sodium hypophosphite and 42 parts of water are heated up to 80°C to obtain the first slurry;

[0056] 28.13 parts of acrylic acid and 7 parts of ammonium persulfate were successively added dropwise to the first slurry, the total dropping time was 1 hour, and the temperature was kept at 80° C. for 2.5 hours to obtain the second slurry;

[0057] Add 27.5 parts of itaconic acid and 9.6 parts of sodium hypophosphite to the second slurry, then add 34.37 parts of acrylic acid and 7 parts of ammonium persulfate dropwise, the total dropping time is 1 hour, and keep warm at 80°C for 3 hours , to obtain the third slurry;

[0058] The temperature of the obtained third slurry was lowered to 45° C., 50 parts of so...

Embodiment 2

[0061] In parts by weight, put 50 parts of methallyl alcohol polyoxyethylene ether into a four-necked flask, heat up to 80°C, make it melt, then add 180 parts of water, heat to 80°C, and add 12.5 parts of horse Toric anhydride, 22.5 parts of itaconic acid, 7 parts of sodium hypophosphite and 44 parts of water are heated up to 80°C to obtain the first slurry;

[0062] Add 60 parts of acrylic acid and 7.7 parts of ammonium persulfate successively dropwise to the first slurry, the total dropping time is 1 hour, keep warm at 80°C for 3 hours, to obtain the second slurry;

[0063] Add 15 parts of itaconic acid and 7 parts of sodium hypophosphite to the second slurry, then dropwise add 40 parts of acrylic acid and 6.3 parts of ammonium persulfate in sequence, the total time of dropping is 1.5h, and keep warm at 80°C 3h, obtain the third slurry;

[0064] The temperature of the obtained third slurry was lowered to 45° C., 70 parts of sodium hydroxide was added, and stirred for 0.5 h ...

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Abstract

The invention belongs-the technical field of coatings, and provides a viscosity reducer. The viscosity reducer is prepared from, by weight, 10-62.5 parts of a functional monomer, 1-25 parts of maleicanhydride, 10-50 parts of itaconic acid, 1-20 parts of a reducing agent, 10-150 parts of acrylic acid, 1-15 parts of an oxidant, 10-80 parts of an inorganic base and 50-250 parts of water; and the functional monomer comprises allyl polyoxyethylene ether or methallyl alcohol polyoxyethylene ether. The allyl polyoxyethylene ether or methallyl alcohol polyoxyethylene ether, used as the functional monomer, is copolymerized with the maleic anhydride, itaconic acid and acrylic acid under the action of the reducing agent, the oxidant and water, and the pH value of the obtained reaction product is adjusted by the inorganic base to obtain a copolymer composed of a functional group and a long-chain structure. The viscosity reducer has a good viscosity-reducing effect, especially has an excellent high-shear viscosity-reducing effect, and is environmentally friendly and degradable.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a viscosity reducer, a preparation method thereof and paper coatings. Background technique [0002] Paper coating is an important factor that determines the quality of the final paper product and the coating process. The ideal paper coating is a pseudoplastic fluid with a certain thixotropy, that is, the fluid characteristics of shear thinning or viscosity reduction. The runnability of the paint not only refers to the runnability of the coating machine, but also includes the runnability of the entire coating process. Good rheological properties of the paint must meet the requirements of various aspects, including pumping, sieving, feeding, and metering. , sizing, reflow and flow and other processes. If the rheological properties of the paint cannot meet the corresponding requirements, then there will be runnability problems. Most of the viscosity reducers on the market can effectively co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F4/40D21H19/38D21H19/40D21H19/44D21H19/58D21H19/64D21H21/08D21H21/12D21H21/14
CPCC08F4/40C08F283/065D21H19/385D21H19/40D21H19/44D21H19/58D21H19/64D21H21/08D21H21/12D21H21/14C08F220/06C08F222/02
Inventor 胡志滨潘好学鲁代玉沈杰赵玥祯
Owner 深圳市瑞成科讯实业有限公司
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