CN114456644B

CN114456644B - High-saturation environment-friendly water-based red paste and preparation method thereof

Info

Publication number: CN114456644B
Application number: CN202111635331.9A
Authority: CN
Inventors: 周贤; 郑仁忠; 刘薇薇; 赵颖; 代海强; 王晨亮
Original assignee: HLS COATING (SHANGHAI) CO Ltd
Current assignee: HLS COATING (SHANGHAI) CO Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2023-04-21
Anticipated expiration: 2041-12-29
Also published as: CN114456644A

Abstract

The invention relates to the field of pigment preparations, in particular to a high-saturation environment-friendly water-based red paste and a preparation method thereof, wherein the water-based red paste comprises, by mass, 10% -30% of pigment, 10% -45% of dispersing agent, 0.1% -3% of wetting agent, 0.1% -1% of defoaming agent, 0.1% -0.5% of bactericide and 20% -50% of water. Compared with the prior art, the invention has the advantages that: 1. the aqueous red paste has good fluidity and can be used as an automobile coating; 2. the color is red and bright, and has very high saturation; 3. the detection of various harmful substances accords with the national GB18582-2008 and GB24408-2009 standards, and the color paste is environment-friendly water-based color paste.

Description

High-saturation environment-friendly water-based red paste and preparation method thereof

Technical Field

The invention relates to the field of pigment preparations, in particular to an environment-friendly water-based red paste with high saturation and a preparation method thereof.

Background

With the rapid development and consumption upgrade of the automobile industry, the colors of the automobile body are diversified day by day, the fashion personalized trend is highlighted, and the color changes are presented at the back and are the upgrade and innovation of the paint technology. The automobile paint can directly influence the 'color value' and the image of the automobile. And even the visual appearance, mechanical properties, durability and environmental protection properties of the car body, the functions and development potential of the car body can not be quite varied. In recent years, along with the improvement of the material life and the enrichment of the mental culture of people, the aesthetic concept and the cultural grade of people are greatly improved, and the attention to the automobile color is also higher and higher when the automobile is purchased. In recent years, red cars have been very interesting to customers, with sales inferior to black and white.

The method for preparing the high-saturation environment-friendly water-based red paste comprises the following steps:

the first method, the mixed refining method of a plurality of pigment. All the pigment used in the paint formulation are mixed together, and ground and dispersed into paint paste by a sand mill or other grinding and dispersing equipment, and then the paint (resin), solvent and auxiliary agent are added to prepare the paint. The paint produced by the method is prepared by only empirically, and is designed for batch production, so that the paint with accurate pigment can be hardly obtained; meanwhile, due to the difference in structural characteristics of various pigment materials, the adsorption ability to the base material is different at the time of grinding dispersion, so that the various pigment materials cannot be sufficiently dispersed in the paint base material, the optimal performance of pigment cannot be exerted, and the dispersion efficiency is lowered. Even if pigment dispersant is used, no excellent effect is obtained.

The second method, the single pigment pulping method. The pigment paste is prepared by grinding pigment into paste, and when the pigment paste is used for preparing color, various monochromatic color pastes are mixed according to the formula, and then resin, solvent and various auxiliary agents are added to prepare the pigment with required pigment color. Since each pigment is individually ground and dispersed in this method, the optimum grinding equipment and process conditions can be selected according to the characteristics of each pigment, and different types of wetting agents and dispersants can be used, respectively, which aid enables the various pigment (including organic or inorganic pigment) to be sufficiently stably dispersed in the same paint base and the optimum performance of the various pigment to be exerted to the maximum extent. The accuracy of the color paint prepared by the method is greatly improved compared with that of the first method, and the color paint is accepted by most manufacturers at home and abroad. However, each color paste produced by the method must be ground and dispersed by using the resin used for producing the color paint, so that the color paste is single in use and has no versatility. Hundreds of paint varieties if there are tens of different resin binders in the same plant. Several hundred different color pastes (even one pigment, several resins, and several color pastes of the same color) are required. Increased production complexity, increased inventory, increased mobile funds; at the same time, a large number of single pigment slurry tanks are required, and the occupation amount of equipment and products is increased. The color paste saturation is not high, and the high-transmittance requirement cannot be met.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and the preparation method is used for preparing the high-saturation environment-friendly water-based red paste, so that the red paste can have higher saturation and presents more gorgeous red after being applied to the automobile coating.

In order to achieve the aim, the environment-friendly water-based red paste with high saturation is designed and comprises, by mass, 10% -30% of pigment, 10% -45% of dispersing agent, 0.1% -3% of wetting agent, 0.1% -1% of defoaming agent, 0.1% -0.5% of bactericide and the balance of water.

Preferably, at least one of the pigments is a red pigment.

Preferably, the pigment is a DPP-based pigment, a perylene-based pigment transparent pigment, and combinations thereof.

Preferably, the dispersant is prepared by free radical polymerization or by controlled free radical polymerization.

Preferably, the wetting agent is an ethoxyalkyne diol product.

Preferably, the defoamer is a modified polysiloxane, polymer-based defoamer.

Preferably, the bactericide is 2-methyl-4-isothiazolin-3-one.

Also designed is a method for preparing high-saturation and environment-friendly water-based red paste, which comprises the following specific steps:

(1) 10 to 30 percent of pigment, 10 to 45 percent of dispersing agent, 0.1 to 3 percent of wetting agent, 0.1 to 1 percent of defoamer and 0.1 to 0.5 percent of bactericide are introduced into a small amount of water according to the proportion, and are stirred and mixed uniformly;

(2) Adding a large amount of water, and stirring and mixing uniformly at a high speed;

(3) Placing the obtained mixture into a high-energy bar pin grinder with a cavity of 1-2L, wherein the cavity filling rate is 80% -90%, selecting zirconium beads as grinding media, controlling the grain diameter to be 0.3-0.6 mm, controlling the linear speed to be 16-20 m/s, further grinding by using a circulating grinding mode, and controlling the flow to be 120-150 kg/h; sand milling to fineness less than 5 μm and particle size of 100-200nm.

Compared with the prior art, the invention has the advantages that:

1. the aqueous red paste has good fluidity and can be used as an automobile coating;

2. the color is red and bright, and has very high saturation;

3. the detection of various harmful substances accords with the national GB18582-2008 and GB24408-2009 standards, and the color paste is environment-friendly water-based color paste.

Detailed Description

The invention is further illustrated below in connection with specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the invention.

1. Reagents used

And (3) pigment: comprises at least one red pigment which is basf

Red L 3885，/>

Red L 3875，/>

Maroon L3920, DPP Red MT, DPP Red ST of Nissan, etc.

Aqueous dispersants: comprises at least one of the following components: BYK-DISPERSANT 190, BYK-DISPERSANT 2012, BYK-DISPERSANT 2015,

4585，/>

4575。

wetting agent: preferably

A series.

Defoaming agent: foamstar SI defoamer is preferred.

Bactericides, including fungicides, preferably Thor

MBS5050

2. The preparation method comprises the following steps:

according to the production batch size, a proper mixing cylinder is selected, a first batch of deionized water, a dispersing agent, a wetting agent and a defoaming agent with corresponding proportions are respectively put into the mixing cylinder in sequence, the mixing cylinder is stirred for 10-20 minutes by using a matched stirrer with the stirring cylinder at 200-500 rpm, then pigments with corresponding proportions are slowly added, the rotating speed of the stirrer is gradually increased, and the slurry has a vortex of about 45 degrees in the mixing cylinder so as to ensure uniform mixing of various raw materials. After all the raw materials are put into the mixer, the mixture is stirred for about 30 minutes, and is sanded by a sand mill until the fineness is less than 5 mu m and the grain diameter reaches 100-200nm, and the bactericide and the second batch of deionized water with corresponding proportions are added to adjust the viscosity.

According to the preparation method, the corresponding red paste is obtained by adopting the proportions in examples 1,2,3 and 4 and the proportions in comparative examples 1 and 2, and the four batches of red pastes in examples 1 to 4 are subjected to the tests of appearance, viscosity, fineness, particle size, saturation and haze values, and the test results are shown in a table seven. The results of each test of example 1 and comparative examples 1,2 are compared as shown in table eight.

Example 1

Table one: raw material ratio in example 1.

Example 2

And (II) table: raw material ratio in example 2.

Example 3

Table three: raw material ratio in example 3.

Example 4

Table four: the raw material ratios in example 4.

Comparative example 1

Table five: the raw materials in comparative example 1 were compounded.

Comparative example 2

Table six: the raw materials in comparative example 2 were compounded.

Table seven: test results of examples 1-4.

/>

The red pulps prepared in examples 1-4 had good flowability, and had very high saturation while achieving a particle size of nanometer scale.

Example 1 with the best saturation was selected and compared with comparative examples 1 and 2 for appearance, viscosity, fineness, particle size (D50), and saturation, and the test results are shown in table eight. Wherein the comparative example 1 and example 1 are different in that the comparative example 1 uses lily DPP red-2028 as red pigment, the comparative example 2 and example 1 are different in that BYK-346 is used as aqueous dispersant, and the composition ratio of the comparative examples 1,2 is shown in Table five, table six.

Table eight: example 1 was compared with the test results of comparative examples 1 and 2.

Product(s)	Example 1	Comparative example 1	Comparative example 2	Detection method
					Appearance of	Smooth and flat, without abnormal	Smooth and flat, without abnormal	Surface particles	Visual inspection
Viscosity of the mixture	54KU	76KU	102KU	Stormer viscometer
					Fineness of	＜5μ	＜5μ	＜30μ	Scraper fineness gauge
Particle size (D50)	0.132um	0.322um	1.532um	Particle diameter instrument
					Saturation level	79.0832	58.7832	38.7832	Photometer

The particle size and saturation of the red paste of example 1 are significantly better than those of comparative examples 1 and 2, demonstrating that the red paste of example 1 provides higher saturation and gives a "red feel" to the customer when applied to automotive paint.

The volatile organic content and the harmful substances were measured in examples 1,2,3 and 4, and the measurement results are shown in Table nine. Table nine: examples 1,2,3 and 4 were conducted to examine the content of harmful substances such as volatile organic compounds.

Description: the detection unit is Haolisen paint (Shanghai) limited company detection center.

Examples 1,2,3 and 4 were tested by the test center of Shanglisen coating (Shanghai) for Volatile Organic Compounds (VOC), free formaldehyde, benzene, toluene, ethylbenzene and xylene according to GB18582-2008, and glycol ether and ether esters according to GB24408-2009, without any harmful substances, and the preparation method belongs to environment-friendly water-based red paste.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

1. The high-saturation environment-friendly water-based Red paste is characterized by comprising, by mass, 10% -30% of pigment, 10% -45% of dispersing agent, 0.1% -3% of wetting agent, 0.1% -1% of defoamer, 0.1% -0.5% of bactericide and the balance of water, wherein the pigment at least comprises one Red pigment, wherein the Red pigment is Paliogen L3885, paliogen Red L3875, paliogen Marool L3920, DPP Red MT of Nissaceae and DPP Red ST, and the dispersing agent comprises at least one of the following components: BYK-DISPERSANT 190, BYK-DISPERSANT 2012, BYK-DISPERSANT 2015, BSF-Dispex 4585, BSF-Dispex 4575.

2. The high-saturation, environment-friendly water-based red paste according to claim 1, wherein the wetting agent is an ethoxyalkyne diol product.

3. The high saturation, environmentally friendly aqueous red paste of claim 1 wherein said defoamer is a polymer-based defoamer.

4. The high-saturation, environment-friendly aqueous red paste according to claim 1, wherein the antifoaming agent is a modified polysiloxane.

5. The high saturation, environmentally friendly aqueous red paste of claim 1 wherein said biocide is 2-methyl-4-isothiazolin-3-one.

6. The method for preparing the high-saturation environment-friendly water-based red paste is characterized by comprising the following specific steps of:

s1, 10 to 30 percent of pigment, 10 to 45 percent of dispersing agent, 0.1 to 3 percent of wetting agent, 0.1 to 1 percent of defoaming agent and 0.1 to 0.5 percent of bactericide are introduced into a small amount of water according to the proportion, and are stirred and mixed uniformly;

s2, adding a large amount of water, and stirring and mixing uniformly at a high speed;

s3, placing the obtained mixture into a high-energy bar pin grinding machine with a cavity of 1-2L, wherein the cavity filling rate is 80% -90%, selecting a grinding medium as zirconium beads, controlling the linear speed to be 16-20 m/S with the particle size of 0.3-0.6 mm, further grinding by using a circulating grinding mode, and controlling the flow to be 120-150 kg/h; sand milling to fineness less than 5 μm and particle size of 100-200nm.