CN114456644A

CN114456644A - High-saturation environment-friendly water-based red paste and preparation method thereof

Info

Publication number: CN114456644A
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: 2022-05-10
Anticipated expiration: 2041-12-29
Also published as: CN114456644B

Abstract

The invention relates to the field of pigment preparations, in particular to 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 water-based red paste has good fluidity and can be used as an automobile coating; 2. has high saturation and bright red color; 3. the detection of various harmful substances meets the national GB18582-2008, GB24408-2009 standard, and is an 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 high-saturation environment-friendly water-based red paste 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 and individuation trend is highlighted, and the upgrade and innovation of the coating technology are shown behind the color change. Automotive coatings can directly affect the "color value" and image of an automobile. And even the visual appearance, mechanical properties, durability and environmental protection of the car body, and the hidden functions and development potentials thereof are not small and varied. In recent years, along with the improvement of physical life and the enrichment of spiritual culture of people, the aesthetic concept and the cultural taste of people are greatly improved, and the attention on the color of the automobile is higher and higher when the automobile is purchased. Red cars have received much attention from customers in recent years, second only to black and white.

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

the first method, a multi-pigment blend-milling method. All the pigments used in the colored paint formulation are mixed together, ground and dispersed into a paint slurry 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 pigment produced by the method is only used for proportioning pigment by experience, and the pigment is designed for batch production, so that the pigment paint with accurate pigment color is difficult to obtain; meanwhile, due to the difference in structural characteristics of the various pigments, the adsorption capacity to the base material is different during the milling dispersion, so that the various pigments cannot be sufficiently dispersed in the paint base material, the optimum performance of the pigment cannot be exerted, and the dispersion efficiency is lowered. Even when the pigment dispersant was used, no good effect was obtained.

The second method, single pigment paste milling. And (2) grinding the pigment paint containing a plurality of pigments into slurry by adopting the same pigment, preparing monochromatic pigment slurry, and mixing various monochromatic color pastes according to a formula during toning and paint preparation, and then adding resin, solvent and various auxiliaries to prepare the pigment paint with the required pigment. In this method, since each pigment is separately ground and dispersed, an optimum grinding apparatus and process conditions can be selected according to the characteristics of each pigment, and different types of wetting agents and dispersing agents can be used separately, and these auxiliaries can sufficiently and stably disperse various pigments (including organic or inorganic pigments) in the same paint base to maximize the performance of each pigment. The accuracy of the colored paint prepared by the method is much higher than that of the first method, and the method 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. If there are dozens of hundreds of paint varieties of different resin bases in the same factory. Hundreds of different mill bases are needed (even if there are several resins and several mill bases of the same color are needed for the same pigment). The production complexity is increased, the inventory is increased, and the mobile capital is increased; and meanwhile, a large number of single pigment slurry storage tanks are required to be arranged, and the occupied amount of equipment and products is increased. The saturation of the color paste is not high, and the high-transparency requirement cannot be met.

Disclosure of Invention

The invention aims to solve the defects of the prior art, and the prepared high-saturation environment-friendly water-based red paste has higher saturation and more gorgeous red color after being applied to automobile coatings.

In order to achieve the purpose, the high-saturation environment-friendly water-based red paste 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, the pigment comprises at least one red pigment.

Preferably, the pigment is a DPP-based pigment, a perylene pigment transparent-type 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 ethoxylated acetylenic diol product.

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

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

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

(1) 10 to 30 percent of pigment, 10 to 45 percent of dispersant, 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 proportionally introduced into a small amount of water and are stirred and mixed evenly;

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

(3) placing the obtained mixed material in a high-energy pin grinder with a cavity of 1-2L, wherein the filling rate of the cavity is 80-90%, the grinding medium is selected to be zirconium beads, the particle size is required to be 0.3-0.6 mm, the linear speed is controlled to be 16-20 m/s, further grinding is carried out by using a circulating grinding mode, and the flow is controlled to be 120-150 kg/h; sanding to the fineness of less than 5 μm and the particle size of 100-200 nm.

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

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

2. has high saturation and bright red color;

3. the detection of various harmful substances meets the national GB18582-2008, GB24408-2009 standard, and is an environment-friendly water-based color paste.

Detailed Description

The invention will be further illustrated 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, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

1. The reagents used

Pigment: comprising at least one red pigment, the red pigment being of Basf

Red L 3885，

Red L 3875，

Maroon L3920, Nike DPP Red MT, DPP Red ST, and the like.

Aqueous dispersant: containing at least one ofThe following components: BYK-DISPERSANT 190, BYK-DISPERSANT 2012, BYK-DISPERSANT 2015,

4585，

4575。

wetting agent: preference is given to

And (4) series.

Defoaming agent: foamstar SI antifoam is preferred.

Fungicides, including fungicides, preferably of Thor

MBS5050

2. The preparation method comprises the following steps:

according to the size of production batch, selecting a proper mixing cylinder, respectively and sequentially putting a first batch of deionized water, a dispersing agent, a wetting agent and a defoaming agent in corresponding proportion into the mixing cylinder, stirring for 10-20 minutes by using a matched stirrer at 200-500 rpm, then slowly adding pigment in corresponding proportion, and gradually increasing the rotating speed of the stirrer to ensure that the slurry has a vortex of about 45 degrees in the mixing cylinder so as to ensure that all raw materials are uniformly mixed. After all the raw materials are put into the reactor, stirring the mixture for about 30 minutes, sanding the mixture by using a sand mill until the fineness is less than 5 mu m and the particle size reaches 100-200nm, and adding a bactericide and a second batch of deionized water according to corresponding proportions to adjust the viscosity.

According to the preparation method, the corresponding red paste is obtained by adopting the mixture ratio in the examples 1,2,3 and 4 and the mixture ratio in the comparative examples 1 and 2, and the four batches of red paste in the examples 1 to 4 are tested for appearance, viscosity, fineness, particle size, saturation and haze value, and the test results are shown in the seventh table. The test results of example 1 were compared with those of comparative examples 1 and 2, as shown in table eight.

Example 1

Table one: the raw material ratio in example 1.

Example 2

Table two: the raw material ratio in example 2.

Example 3

Table three: the raw material ratio in example 3.

Example 4

Table four: the raw material ratio in example 4.

Comparative example 1

Table five: the raw material ratio in comparative example 1.

Comparative example 2

Table six: the raw material ratio in comparative example 2.

TABLE VII: test results for examples 1-4.

The red slurry prepared in the examples 1 to 4 has good fluidity, and has high saturation while the particle size reaches the nanometer level.

The example 1 with the best saturation is selected to be compared with the comparative examples 1 and 2 for the tests of appearance, viscosity, fineness, particle size (D50) and saturation, and the test results are shown in the table eight. Wherein comparative example 1 is different from example 1 in that comparative example 1 uses lily DPP red-2028 as a red pigment, comparative example 2 is different from example 1 in that BYK-346 is used as an aqueous dispersant, and the component ratios of comparative examples 1,2 are shown in Table five and Table six.

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

Product(s)	Example 1	Comparative example 1	Comparative example 2	Detection method
					Appearance of the product	Smooth and no abnormal condition	Smooth and free from abnormal conditions	Surface particles	Visualization of
Viscosity of the oil	54KU	76KU	102KU	Stormer viscometer
					Fineness of fineness	＜5μ	＜5μ	＜30μ	Scraper blade fineness gauge
Particle size (D50)	0.132um	0.322um	1.532um	Particle size meter
					Degree of saturation	79.0832	58.7832	38.7832	Photometric instrument

The particle size and the saturation of the red paste in the example 1 are obviously better than those in the comparative example 1 and the comparative example 2, which shows that the red paste in the example 1 can provide higher saturation when being applied to automobile paint and can provide a red brilliant feeling for customers.

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

Description of the drawings: the detection unit is the detection center of the Haolison paint (Shanghai) Limited company.

In the examples 1,2,3 and 4, the total content (VOC), free formaldehyde, benzene, toluene, ethylbenzene and xylene of the Volatile Organic Compounds (VOC) is detected according to GB18582-2008 by a Haolison paint (Shanghai) Limited company detection center, and the total content of glycol ether and ether ester is detected according to GB24408-2009, so that no harmful substance is detected, and the color paste belongs to environment-friendly water-based red paste.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

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 defoaming agent, 0.1% -0.5% of bactericide and the balance of water.

2. The highly saturated, environmentally friendly aqueous red paste according to claim 1, wherein at least one of said pigments is a red pigment.

3. The high-saturation environment-friendly aqueous red paste according to claim 2, wherein the pigment is DPP pigment, perylene pigment transparent pigment and combination thereof.

4. The highly saturated, environmentally friendly aqueous red paste according to claim 1, wherein the dispersant is prepared by free radical polymerization or by controlled free radical polymerization.

5. The highly saturated, environmentally friendly aqueous red paste according to claim 1, wherein the wetting agent is an ethoxylated acetylenic diol product.

6. The high-saturation environment-friendly water-based red paste according to claim 1, wherein the defoaming agent is modified polysiloxane or polymer-based defoaming agent.

7. The high-saturation environment-friendly water-based red paste according to claim 1, wherein the bactericide is 2-methyl-4-isothiazolin-3-one.

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

s1, introducing 10-30% of pigment, 10-45% of dispersing agent, 0.1-3% of wetting agent, 0.1-1% of defoaming agent and 0.1-0.5% of bactericide into a small amount of water according to the proportion, and stirring and mixing uniformly;

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

s3, placing the obtained mixed material in a high-energy rod pin grinding machine with a cavity of 1-2L, wherein the filling rate of the cavity is 80% -90%, selecting grinding media as zirconium beads, the grain diameter is required to be 0.3-0.6 mm, controlling the linear speed to be 16-20 m/S, and further grinding in a circulating grinding mode, wherein the flow rate is controlled to be 120-150 kg/h; sanding to the fineness of less than 5 μm and the particle size of 100-200 nm.