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Coating thickening water-retaining agent and preparation method thereof

A thickening water-retaining agent and coating technology, applied in paper coating, coating, fiber raw material treatment, etc., can solve problems such as poor water retention, inability to increase vehicle speed, and residual monomers

Pending Publication Date: 2021-07-13
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

At present, the disadvantages of traditional thickener products mainly include: residual monomers, extensive use of APEO emulsifiers, and insufficient water retention and thickening properties of the product, as well as high viscosity under high-speed shear force. Coating application
Poor water retention will mainly cause failures such as sticking rollers of the coating machine, blocked feeding pipes, and failure to increase the speed of the vehicle, as well as paper defects such as scratches and poor strength in the finished paper, which will affect the production quality of coated paper.
Insufficient thickening performance will mainly cause the viscosity of the paint to increase, resulting in flocculation or precipitation of pigments in the paint, which will affect the use of the paint
In the future, papermaking will move toward large-scale and high-speed paper machines, and the speed of coating will reach 1800-2000m / min. To meet these development trends, it is usually required to speed up the operation of the paper machine during the coating process, and the speed of coating will be accelerated. Causes high shear. Under high shear, the viscosity of the coating will increase significantly, which will affect the operation of the paper machine and also affect the quality of the paper. Under high shear conditions, it is easy to cause problems such as coating streaks

Method used

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  • Coating thickening water-retaining agent and preparation method thereof
  • Coating thickening water-retaining agent and preparation method thereof
  • Coating thickening water-retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] A paint thickening and water-retaining agent, prepared through the following steps:

[0073] 1. Add emulsifier K (anionic emulsifier sodium dodecylsulfonate) 0.2g, emulsifier AEO-151g, add water 50g, stir and mix well, then add sodium bicarbonate 0.1g, mix Evenly, add 2g of BEM, 1.5g of SEM, mix well, add 0.5g of N,N-methylenebisacrylamide, mix well, then add 24g of methacrylic acid, 5g of methyl methacrylate, 29g of ethyl acrylate, 3g of hydroxyethyl methacrylate was stirred and emulsified to obtain a pre-emulsion;

[0074] 2. Weigh 0.02g of initiator (sodium persulfate), add 5g of water, and stir to completely dissolve;

[0075] 3. Add 60g of water to the reaction kettle, then add 0.5g of emulsifier DBR-Z, start stirring, and raise the temperature to 82°C;

[0076] 4. Add the initiator (sodium persulfate) aqueous solution obtained in step 2 into the reactor, stir for 2min, then add 3g of pre-emulsion, stir and react, the stirring speed is controlled at 180-200r / min,...

Embodiment 2

[0083] A paint thickening and water-retaining agent, prepared through the following steps:

[0084] 1. Add 0.3g of emulsifier K (anionic emulsifier sodium dodecylbenzenesulfonate), 1.1g of emulsifier AEO-15, 50g of water, stir and mix well, and then add 0.08 sodium bicarbonate g, mix well, then add BEM 3g, SEM 2g, mix well, add N,N-methylenebisacrylamide 0.3g, mix well, then add methacrylic acid 28g, butyl acrylate 6.7g, ethyl acrylate 20g, Hydroxyethyl methacrylate 5g is stirred and emulsified to obtain a pre-emulsion;

[0085] 2. Weigh 0.02g of initiator (ammonium persulfate), add 5g of water, and stir to completely dissolve;

[0086] 3. Add 60g of water into the reaction kettle, then add 0.45g of emulsifier DBR-Z, start stirring, and raise the temperature to 85°C;

[0087] 4. Add the initiator (ammonium persulfate) obtained in step 2 into the reactor, stir for 2min, then add 5g of pre-emulsion, stir and react, the stirring speed is controlled at 180-200r / min, and the reac...

Embodiment 3

[0094] A paint thickening and water-retaining agent, prepared through the following steps:

[0095] 1. Add 0.4g of emulsifier K (anionic emulsifier sodium dodecylbenzenesulfonate), 1.05g of emulsifier AEO-15, 50g of water, stir and mix well, and then add 0.05g of sodium bicarbonate g, mix well, then add BEM1g, SEM3g, mix well, add N,N-methylenebisacrylamide 0.5g, mix well, then add methacrylic acid 25g, methyl methacrylate 5g, ethyl acrylate 27g, 3.5g of hydroxyethyl acrylate was stirred and emulsified to obtain a pre-emulsion;

[0096] 2. Weigh 0.02g of initiator (ammonium persulfate), add 5g of water, and stir to completely dissolve;

[0097] 3. Add 60g of water to the reaction kettle, then add 0.4g of emulsifier DBR-Z, start stirring, and raise the temperature to 85°C;

[0098] 4. Add the initiator (ammonium persulfate) obtained in step 2 into the reactor, stir for 2min, then add 5g of pre-emulsion, stir and react, the stirring speed is controlled at 180-200r / min, and the...

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Abstract

The invention discloses a coating thickening water-retaining agent, which is prepared from the following raw materials in parts by weight: 0.05 to 10 parts of an anionic emulsifier, 0.05 to 20 parts of a nonionic emulsifier, 0.5 to 200 parts of a reaction monomer, 0.1 to 40 parts of a functional monomer, 0.1 to 30 parts of a modified monomer, 0.01 to 10 parts of a buffering agent, 0.005 to 10 parts of an initiator, 0.005 to 20 parts of an oxidant and a proper amount of water. The functional monomer comprises at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methylacrylate and hydroxypropyl methacrylate. The coating thickening water-retaining agent prepared by the invention has the characteristic of small dosage, is good in thickening effect, excellent in water retention performance and excellent in shear thinning capability, and is very suitable for high-solid-content coatings; and the prepared coating thickening water-retaining agent is environmentally friendly and free of peculiar smell, residual monomers are removed through some post-treatment processes, the residual monomers are greatly reduced, and therefore the prepared product is environmentally friendly and free of peculiar smell and does not contain APEO substances.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a thickening and water-retaining agent for coatings and a preparation method thereof. Background technique [0002] In the field of coatings, as environmental protection requirements become more and more stringent, higher restrictions are put forward for organic volatiles and APEOs (alkylphenol polyoxyethylene ether compounds) in coatings, and additives in coatings are required The agent should have extremely low monomer residue and not contain APEO substances. At present, the disadvantages of traditional thickener products mainly include: residual monomers, extensive use of APEO emulsifiers, and insufficient water retention and thickening properties of the product, as well as high viscosity under high-speed shear force. Coating application. Poor water retention will mainly cause failures such as sticking rollers of the coating machine, blocked feeding pipes, and failure to increase the...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/14C08F220/18C08F222/38C08F220/20C08F2/26C08F2/30D21H19/20
CPCC08F220/06C08F2/26C08F2/30D21H19/20
Inventor 胡志滨潘好学鲁代玉沈杰陈荦
Owner 深圳市瑞成科讯实业有限公司
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