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Rheology modifying agent and preparation method thereof

A technology of modifying agent and initiator, applied in the direction of coating, etc., can solve the problems that the rheological agent cannot effectively prevent the flocculation of coating particles, cannot be coated, and the viscosity increases, so as to improve the paper covering performance and gloss, Improved fluidity and increased solid content

Inactive Publication Date: 2012-07-18
深圳市瑞成科讯实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Existing rheological agents show many deficiencies for coatings with high solid content, which are mainly manifested in: at high concentrations (>68%), rheological agents cannot effectively prevent the flocculation of coating particles. Therefore, when the solid content of coatings increases When high, it is easy to produce coating scratches; existing rheological agents can improve the viscosity of coatings, which is beneficial in coatings with low solid content
However, when the concentration of the coating is > 68%, the viscosity will increase due to the increase of the solid content of the coating itself, and adding a rheological agent will cause the viscosity to increase too much and cannot be coated

Method used

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  • Rheology modifying agent and preparation method thereof
  • Rheology modifying agent and preparation method thereof
  • Rheology modifying agent and preparation method thereof

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preparation example Construction

[0019] The invention provides a preparation method of a rheology modifier, which comprises the following steps: 1) under stirring conditions, acrylic monomers and functional monomers are polymerized in an aqueous solution under the action of an initiator; 2) step 1 ) adjusting the pH value of the polymerized solution to 6.0-8.0; and 3) keeping warm, stopping stirring, and discharging to obtain a rheology modifier.

[0020] According to an embodiment of the present invention, the acrylic monomer is selected from at least one of acrylic acid (AA), methacrylic acid (MAA), itaconic acid, and fumaric acid.

[0021] According to one embodiment of the present invention, the functional monomer is selected from maleic anhydride (MA), acrylamide (AM), sodium allyl sulfonate, 2-hydroxyethyl methacrylate (HEMA), 2-acrylic acid At least one of hydroxyethyl ester (HEA), sodium methacrylsulfonate, N-methylolacrylamide, and 2-acrylamido-2-methylpropenesulfonic acid (AMPS).

[0022] According...

Embodiment 1

[0029] According to the composition and content shown in Table 1, the rheology modifier of the present invention is prepared according to the following method, and the specific steps are: 1) Add water, 4 g of maleic anhydride, and 1.6 g of sodium hypophosphite in a 250 ml reactor, and start stirring to dissolve Raise the temperature to 75°C; 2) After completely dissolving and keeping the temperature constant, add the mixed monomer (acrylic acid 21g, acrylamide 1.4g, water) and initiator ammonium persulfate aqueous solution 0.45g dropwise, and add dropwise in 2-2.5h; 3 ) After finishing the dropwise addition, keep it warm for 3 hours, then lower the temperature to 45°C, and use 30% sodium hydroxide solution to adjust the pH value to 6.5; agent.

[0030] Table 1: Composition and content of embodiment 1

[0031]

Embodiment 2

[0033] Prepare rheology modifier of the present invention according to the composition and content shown in table 2, concrete steps are: 1) add water, allyl sodium sulfonate 5.2g, sodium bisulfite 4.3g in 250ml reactor , start stirring and dissolving and heat up to 75°C; 2) After completely dissolving and keeping the temperature constant, add the mixed monomer (methacrylic acid 29g, sodium methacrylate sulfonate 0.8g, water) and initiator ammonium persulfate aqueous solution 0.7g , 2-2.5h dropwise addition; 3) After completion of dropwise addition, keep warm for 2h, then lower the temperature to 45°C, adjust the pH value to 7.0 with 30% sodium hydroxide solution; 4) After adjusting the pH value, keep warm for 0.5h, stop Stir and discharge to obtain a rheology modifier.

[0034] Table 2: Composition and content of embodiment 2

[0035]

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Abstract

The invention discloses a rheology modifying agent and a preparation method thereof. The preparation method comprises the following steps: 1) polymerizing an acrylic acid monomer with a functional monomer in an aqueous solution in the presence of an initiator under the condition of stirring; 2) regulating the PH value of a solution obtained after polymerization to 6.0-8.0; and 3) carrying out heat preservation, stopping stirring and discharging to obtain the rheology modifying agent. The preparation method of the rheology modifying agent is simple in process and low in cost. The rheology modifying agent prepared by using the method disclosed by the invention can effectively improve the flowing property of paint, prevent the paint from flocculating, reduce the generation of coating scratches and effectively reduce the viscosity of the paint.

Description

technical field [0001] The invention relates to a rheology modifier, in particular to a rheology modifier which can be used for coatings with high solid content and a preparation method thereof. Background technique [0002] The solid content of the coating is a basic and important performance index of the coating. A high solid content can explain the film-forming substance content of the coating from the side, such as one-time film thickness, convenient construction, less loss of non-solid components, and for solvent-based Coatings also have less impact on the environment. [0003] For the paper industry, one of the development trends of paper coating formulations is that the solid content in coating formulations is gradually increasing. At present, the solid content of coatings used by major coated paper manufacturers in the world is generally above 65%. The use of high solids coatings not only saves drying energy, but also increases vehicle speed and production. Studie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F222/02C08F222/06C08F220/56C08F228/02C08F4/40C09D7/12
Inventor 胡志滨潘好学王传杰
Owner 深圳市瑞成科讯实业有限公司
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