阅读说明：本技术 分散剂、含该分散剂的有机色浆及制备方法 (Dispersing agent, organic color paste containing dispersing agent and preparation method ) 是由 刘阳 周贤 刘薇薇 赵颖 张建中 何伟杨 廖伟琪 于 2019-11-13 设计创作，主要内容包括：本发明涉及分散剂、含该分散剂的有机色浆及制备方法,有机色浆中采用的分散剂为钛酸酯改性阴离子无规共聚物。本发明的分散剂能够有效提高了有机颜料在水中的润湿分散性,所得组合物颜料颗粒的平均粒径≤100nm,着色力高,长时间储存不会出现颜料沉淀、粘度变化显著等问题,且该分散助剂制备工艺简单,色浆具有良好的流变性和均一性。同时该有机颜料分散体的性能与使用苯乙烯-丙烯酸钠盐分散剂、苯乙烯-马来酸酐铵盐分散剂等传统助剂制备的有机颜料分散体相当,但所用助剂绿色环保。(The invention relates to a dispersant, organic color paste containing the dispersant and a preparation method thereof, wherein the dispersant adopted in the organic color paste is titanate modified anion random copolymer. The dispersant can effectively improve the wetting dispersibility of the organic pigment in water, the average particle size of the pigment particles of the obtained composition is less than or equal to 100nm, the tinting strength is high, the problems of pigment precipitation, obvious viscosity change and the like can not occur after long-time storage, and the dispersing auxiliary has simple preparation process and good rheological property and uniformity of color paste. Meanwhile, the performance of the organic pigment dispersion is equivalent to that of an organic pigment dispersion prepared by using traditional additives such as a styrene-acrylic acid sodium salt dispersing agent, a styrene-maleic anhydride ammonium salt dispersing agent and the like, but the used additives are green and environment-friendly.)

1. A dispersant, characterized by containing a random copolymer having the structure of formula I,

wherein the content of the first and second substances,

m and n are integers of 5 to 30,

x is H, Na⁺、K⁺Or NH₄ ⁺。

2. An organic color paste characterized by being added with the dispersant as described in claim 1.

3. The organic color paste according to claim 2, wherein the organic color paste comprises 38.0-52.0 wt% of organic pigment, 1.5-3.2 wt% of wetting agent, 12.0-3.2 wt% of dispersing agent, 8.0-20.0 wt% of water-soluble organic solvent, 0.5-3.0 wt% of functional auxiliary agent and the balance of water.

4. The organic color paste according to claim 3, wherein the organic pigment has an oil absorption of 30 to 72g and is at least one selected from the group consisting of phthalocyanine pigments, polycyclic pigments and azo pigments.

5. The organic color paste according to claim 3, wherein the water-soluble organic solvent is at least one selected from the group consisting of ethylene glycol, propylene glycol, polypropylene glycol, and the like.

6. The organic color paste according to claim 3, wherein the functional assistant is at least one selected from the group consisting of a mildewproof sterilizing agent and a pH regulator.

7. The organic color paste according to claim 6, wherein the pH regulator is selected from the group consisting of potassium hydroxide solution, sodium hydroxide solution, ammonia, monoethanolamine, diethanolamine and triethanolamine.

8. The organic color paste according to claim 6, wherein the mildew-proof bactericide is at least one selected from the group consisting of 1, 2-benzisothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, and sodium benzoate.

9. The organic color paste as claimed in claim 6, wherein the addition amount of the mildew-proof sterilizing agent is 0.5-0.8% of the weight of the organic pigment.

10. A process for preparing the dispersing agent according to claim 1, characterized in that acrylic acid, styrene and isopropanol are polymerized at 80 ℃, then the compound of formula II is added for modification and dehydration, the pH is adjusted to 6.5-8,

Technical Field

The invention relates to a dispersant, organic color paste containing the dispersant and a preparation method thereof.

Background

With the rise of industrial paint, the diversification of colors and the automatic implementation of equipment, the timeliness of color mixing has prevented the rapid development, and the preparation of the color paste for the automatic color mixing system of the water-based paint solves the problem of the obstacle.

The invention mainly solves the problem that the automatic color mixing system is difficult to realize from the viscosity, the specific gravity, the rheological property, the uniformity, the drying speed and the like of color paste.

Disclosure of Invention

The main object of the present invention is to provide a new dispersant structure,

in order to achieve the above object, the invention provides a dispersant containing a random copolymer having a structure of formula I,

wherein the content of the first and second substances,

m and n are integers of 5 to 30,

x is H, Na⁺、K⁺Or NH₄ ⁺。

The invention also relates to organic color paste, wherein the dispersant is added into the organic color paste.

The organic color paste further comprises 38.0-52.0 wt% of organic pigment, 1.5-3.2 wt% of wetting agent, 12.0-3.2 wt% of dispersing agent, 8.0-20.0 wt% of water-soluble organic solvent, 0.5-3.0 wt% of functional auxiliary agent and the balance of water.

The organic pigment used in the organic color paste preferably has an oil absorption of 30-72g, and is selected from at least one of phthalocyanine pigment, polycyclic pigment and azo pigment.

The water-soluble organic solvent used in the organic color paste is preferably at least one selected from ethylene glycol, propylene glycol, polypropylene glycol and other solvents.

The functional auxiliary agent adopted in the organic color paste is at least one selected from a mildew-proof sterilizing agent and a pH value regulator.

The pH regulator is preferably selected from potassium hydroxide solution, sodium hydroxide solution, ammonia water, monoethanolamine, diethanolamine or triethanolamine.

The mildew-proof bactericide is preferably at least one selected from 1, 2-benzisothiazolin-3-one, 2-methyl-4-isothiazolin-3-one and sodium benzoate. The organic pigment dispersion may have phenomena of mold growth or odor emission caused by mass bacterial reproduction, titanate auxiliary agent degradation and the like, and the proper amount of the mildew-proof bactericide can prevent the phenomena.

The addition amount of the mildew-proof sterilizing agent is 0.5-0.8% of the weight of the organic pigment.

The invention also relates to a preparation method of the dispersant, which comprises the steps of carrying out polymerization reaction on acrylic acid, styrene and isopropanol at the temperature of 80 ℃, adding a compound shown as a formula II for modification and dehydration, adjusting the pH value to 6.5-8,

compared with the prior art, the invention has the following beneficial effects:

1. the dispersing agent is a titanate modified anionic random copolymer, can effectively improve the wetting dispersibility of organic pigments in water, has the advantages of average particle size of not more than 100nm, high tinting strength, no pigment precipitation after long-time storage, obvious viscosity change and the like, and has simple preparation process and good rheological property and uniformity of color paste.

2. Meanwhile, the performance of the organic pigment dispersion is equivalent to that of an organic pigment dispersion prepared by using traditional additives such as a styrene-acrylic acid sodium salt dispersing agent, a styrene-maleic anhydride ammonium salt dispersing agent and the like, but the used additives are green and environment-friendly.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

TABLE 1 compositions of examples 1-8

(unit: mass percentage)