Wetting dispersant and application thereof

A technology of wetting and dispersing agent and dispersing agent, applied in the direction of pigment slurry, coating, etc., can solve the problems of easy aggregation and thickening, pigment instability, etc., to avoid aggregation, improve compatibility and stability, and avoid thickening Effect

Active Publication Date: 2021-12-10
YANGZHOU POLYTECHNIC INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a wetting and dispersing agent to solve the problems of unstable pigments in water-based paints, easy aggregation and coarsening

Method used

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  • Wetting dispersant and application thereof
  • Wetting dispersant and application thereof

Examples

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preparation example Construction

[0041] The preparation process of modified nanocellulose is as follows:

[0042] Add 5g of ground cellulose to the reaction flask, heat to 50°C, slowly add 65% sulfuric acid dropwise, stir for 3 hours, cool to room temperature, add water to terminate the reaction, centrifuge and remove the upper clear night, centrifuge 4-5 times until the upper layer appears colloid; Place the obtained colloid in a reaction flask and heat it to 80°C, add 0.001g of potassium persulfate to it to initiate, then add acrylic acid and alkenyl sulfonic acid compound and stir for 12h; Extraction under low pressure, and then extraction by rotary steaming to obtain modified nanocellulose.

[0043] When the above-mentioned alkenyl sulfonic acid compound is 2-acrylamido dodecyl sulfonic acid or 2-acrylamido-2-methyl propane sulfonic acid, the modified nanocellulose prepared is respectively denoted as CNC-1, CNC-2.

Embodiment 1

[0045] Wetting and dispersing agent A: Mix product 1, polycarboxylate dispersant and block polyether dispersant in a mass ratio of 4:1:1, add ethanol / water with a volume ratio of 1 / 4 to make the solid content 55wt %, prepared by rapid stirring;

[0046] Wetting and dispersing agent B: Add water to CNC-1 to make the solid content 40wt%;

[0047] Mix 6wt% of wetting and dispersing agent A with 40wt% of carbon black pigment, slowly add carbon black pigment in portions, stir and disperse quickly during the addition process; continue stirring for 30min after adding carbon black pigment, then add 1wt% of wetting For wet dispersant B, add water at the end to make the total mass 100%, and continue to stir until a uniform slurry is obtained; finally, ball mill in a ball mill to obtain a carbon black slurry.

Embodiment 2

[0049] Wetting and dispersing agent A: Mix product 2, polycarboxylate dispersant and block polyether dispersant in a mass ratio of 5:1:1, add ethanol / water with a volume ratio of 1 / 4 to make the solid content 55wt %, prepared by rapid stirring;

[0050] Wetting and dispersing agent B: Add water to CNC-1 to make the solid content 45wt%;

[0051] Mix 7wt% of wetting and dispersing agent A with 50wt% of carbon black pigment, slowly add carbon black pigment in portions, stir and disperse quickly during the addition process; continue stirring for 30min after adding carbon black pigment, then add 1wt% of wetting For wet dispersant B, add water at the end to make the total mass 100%, and continue to stir until a uniform slurry is obtained; finally, ball mill in a ball mill to obtain a carbon black slurry.

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Abstract

The invention relates to a wetting dispersant and application thereof. The wetting dispersant comprises a wetting dispersant A and a wetting dispersant B, the wetting dispersant A is prepared by mixing a phospholipid-based wetting dispersant, a polycarboxylate dispersant and a block polyether dispersant according to a mass ratio of (4-6): (0.5-1): (0.5-1), adding ethanol / water with a volume ratio of 1 / 4 until the solid content is 50-60wt%, and rapidly stirring the mixture; and the wetting dispersant B is prepared by adding water into modified nano cellulose until the solid content is 40-50wt%. According to the wetting dispersant and application thereof of the invention, an amphiphilic macromolecular surfactant is obtained through hydrophilic modification on the surface of the phospholipid group, so that the wetting dispersant has enough wetting ability, so that the high efficiency of dispersion is ensured; the steric hindrance is large, so that aggregation of pigment particles is avoided; and the surface of the wetting dispersant has abundant anchoring groups, so that the pigment particles are more stable in a dispersion system; and the modified nano cellulose has a certain viscosity reduction effect, so that thickening is avoided, meanwhile, the compatibility stability of the dispersion system is improved, and settling and flooding are further prevented.

Description

technical field [0001] The invention belongs to the technical field of paint additives, in particular to a wetting and dispersing agent and its application. Background technique [0002] my country's coating industry is facing huge challenges. In the past, volatile and toxic substances such as benzene and methyl ethyl ketone were common in coatings. Heavy metals and TOC in many coating products seriously exceeded the standard, which affected people's health and safety. With the continuous improvement of people's awareness of environmental protection, environmentally friendly coatings such as high-solid coatings, water-based coatings and UV light-curing coatings have been developed accordingly. Among them, water-based coatings need to select appropriate coating resins, pigments and fillers, and then use auxiliary agents to form a stable system. [0003] There are many types of additives in water-based coating systems, such as defoamers, substrate wetting agents, dispersants,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/65C09D17/00
CPCC09D7/65C09D17/001C09D17/005
Inventor 周寅飞
Owner YANGZHOU POLYTECHNIC INST
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