WO2024066591A1 - Environment-friendly antimicrobial mildew-proof water-based pigment paste as well as preparation method therefor and use thereof - Google Patents

Abstract

An environment-friendly antimicrobial mildew-proof water-based pigment paste, comprising the following components in percentage by mass: 10-80 wt% of a pigment, 0-40 wt% of a dispersing agent, 0.3-3 wt% of a microbicide, 0-5 wt% of a wetting agent, 0-5 wt% of a defoaming agent and 0-3 wt% of an anti-settling agent, with the balance being water, and the total mass percentage content of the components being 100%. The environment-friendly antimicrobial mildew-proof water-based pigment paste does not contain isothiazolinone and pyrithione type microbicides, and is thus harmless to the environment and human bodies; and the pigment paste is suitable for color mixing in water-based coating, and has the advantages of good antimicrobial and mildew-proof effect, long lasting time, a wide range of applicable coating systems, etc. The present invention further relates to a preparation method for and the use of the environment-friendly antimicrobial mildew-proof water-based pigment paste.

Description

Environmentally friendly antibacterial and mildew-proof water-based pigment paste and preparation method and application thereof Technical Field

The invention relates to the field of water-based pigment paste, and in particular to an environmentally friendly antibacterial and mildew-proof water-based pigment paste, and a preparation method and application of the paste.

Background technique

With the long-term development of the coatings industry and people's increasing demand for green environmental protection, water-based coatings have gradually become an inevitable trend in the development of coatings. As a coloring material, color paste can not only make the coating present rich and colorful colors, but also give the coating better hiding power, coating mechanical strength and other properties. It is an indispensable component of coatings. In the production, use and storage of color pastes, microorganisms such as bacteria and fungi are often easily introduced. The aqueous environment provides a good environment for the growth and reproduction of these microorganisms. When microorganisms multiply in large numbers, the color paste and coating products will be degraded, which is specifically manifested in the change of color of the color paste, the generation of pungent odor, the stability of the color paste, the decrease of viscosity, etc., causing the product to deteriorate and become unusable.

The main solution to the above problem in the prior art is to add an in-tank mildew and fungicide to the color paste. Among them, isothiazolinone and its derivatives (such as MIT, BIT, OIT, CMIT, etc.) are currently commonly used mildew and fungicide because of their irreversible killing and inhibitory effects on microorganisms. For example, CN1449245A discloses a fungicide containing 2-methylisothiazolin-3-one; CN108676478A discloses a washable relief paint with isothiazolinone as a fungicide.

However, due to the high irritation of isothiazolinone and its derivatives to the skin, which can cause a certain degree of harm to the human body, the use of such fungicides is currently subject to great restrictions. For example, the EU environmental label stipulates that the total amount of isothiazolinone shall not exceed 500ppm, the German Blue Angel paint regulations require that interior wall paints will no longer be allowed to use MIT/CIT fungicides, and China's "Green Product Evaluation-Coatings" (GB/T 35602-2017) also limits the total amount of isothiazolinone to 750ppm. In addition to isothiazolinone and its derivatives, zinc pyrithione is also a highly effective fungicide because it can interact with microbial membranes to kill microorganisms. However, due to its reproductive toxicity and negative impact on the environment and ecology, its use is also restricted. For example, the "Green Product Evaluation-Coatings" stipulates that the use of zinc pyrithione shall not exceed 1500ppm.

In view of the above reasons, it is urgent to develop an environmentally friendly antibacterial and mildew-proof water-based pigment paste that does not contain isothiazolinone and pyridinethione fungicides to solve the problems faced in the field of existing water-based pigment pastes.

Summary of the invention

Based on the above facts, the purpose of the present invention is to provide an environmentally friendly antibacterial and mildew-proof water-based pigment paste, which uses alcohol ether solvents to replace isothiazolinone and pyridinethione fungicides, is harmless to the environment and human body, can effectively inhibit the growth of microorganisms such as bacteria and fungi, is not consumed while sterilizing, and has a long-lasting sterilization and mildew-proof effect. The present invention also relates to the preparation method and application of the above environmentally friendly antibacterial and mildew-proof water-based pigment paste.

The first aspect of the present invention provides an environmentally friendly antibacterial and mildew-proof water-based pigment paste, which comprises, by weight percentage:

The total weight percentage of the above components is 100 wt%.

pigment

In the present invention, the pigment is a substance that provides color. All substances that can be used for coloring are included in the scope of the pigment. Specifically, the pigment can be divided into two categories: organic pigments and inorganic pigments.

In some preferred embodiments of the present invention, the organic pigment is selected from one or more of black pigments and color pigments; specifically, the organic pigment is selected from one or more of disazo pigments, disazo condensation pigments, dibenzopyrene dione pigments, anthraquinone pigments, anthraquinone pyrimidine pigments, benzimidazolone pigments, quinacridone pigments, quinophthalone pigments, diketopyrrolopyrrole pigments, dioxazine pigments, indanthrone pigments, isoindoline pigments, isoindolinone pigments, perylene pigments, phthalocyanine pigments, pyrazolequinazolinone pigments; more specifically, the organic pigment is selected from one or more of the following types of pigments:

Disazo pigments: C.I. Pigment Yellow 12, 13, 14, 16, 17, 81, 83, 106, 113, 126, 127, 155, 170, 174, 176 and 188; C.I. Pigment Orange 16, 34 and 44;

Disazo condensation pigments: C.I. Pigment Yellow 93, 95 and 128; C.I. Pigment Red 144, 166, 214, 220, 221, 242 and 262; C.I. Pigment Brown 23 and 41;

Dibenzopyrene dione pigment: C.I. Pigment Red 168;

Anthraquinone pigments: C.I. Pigment Yellow 147 and 199; C.I. Pigment Red 177;

Anthraquinone pigment: C.I. Pigment Yellow 108;

Benzimidazolone pigments: C.I. Pigment Yellow 120, 151, 154, 180, 181; C.I. Pigment Orange 36 and 72; C.I. Pigment Red 175, 185, 208; C.I. Pigment Brown 25; C.I. Pigment Violet 32;

Quinacridone pigments: C.I. Pigment Orange 48 and 49; C.I. Pigment Red 122, 202, 206 and 209; C.I. Pigment Violet 19;

Quinophthalone pigment: C.I. Pigment Yellow 138;

Diketopyrrolopyrrole pigments: C.I. Pigment Orange 71, 73 and 81; C.I. Pigment Red 254, 255, 264, 270 and 272;

Dioxazine pigment: C.I. Pigment Violet 23;

Indanthrone pigments: C.I. Pigment Blue 60 and 64;

Isoindoline Pigments: C.I. Pigment Yellow 139 and 185; C.I. Pigment Orange 61 and 69; C.I. Pigment Red 260;

Isoindolinone pigments: C.I. Pigment Yellow 109, 110 and 173;

Perylene Pigments: C.I. Pigment Red 123, 149, 178, 179 and 224; C.I. Pigment Violet 29; C.I. Pigment Black 31 and 32;

Phthalocyanine pigments: C.I. Pigment Blue 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16; C.I. Pigment Green 7, 36;

Pyrazolequinazolinone pigments: C.I. Pigment Orange 67 and C.I. Pigment Red 216.

In some preferred embodiments of the present invention, the inorganic pigment is selected from one or more of coloring pigments and pearlescent pigments, wherein the coloring pigment can be selected from black, white, and colored coloring pigments; specifically, the inorganic pigment One or more of the following pigments:

White pigment: titanium dioxide (C.I. Pigment White 6);

Black pigments: black iron oxide (C.I. Pigment Black 11), iron manganese black, spinel black (C.I. Pigment Black 27); carbon black (C.I. Pigment Black 7); graphite (C.I. Pigment Black 10); chromium iron oxide black (P. Brown 29);

Color pigments: red iron oxide (C.I. Pigment Red 101); brown iron oxide (C.I. Pigment Brown 6 and 7); yellow iron oxide (C.I. Pigment Yellow 42); nickel titanium yellow (C.I. Pigment Yellow 53; C.I. Pigment Yellow 157, 158, 159, 160, 161, 162, 163, 164 and 189); spinel phase (C.I. Pigment Yellow 119); bismuth vanadate (C.I. Pigment Yellow 184).

In some more preferred embodiments of the present invention, in the environmentally friendly antibacterial and mildew-proof water-based pigment paste, the content of the pigment is 20-70wt% by weight, which may be determined according to the type of the pigment.

Dispersant

In some embodiments of the present invention, the dispersant is an aqueous dispersant.

Specifically, the dispersant is selected from one or more of styrene/acrylic acid copolymer, acrylic acid/maleic acid copolymer, acrylic acid/methacrylic acid copolymer, butadiene/acrylic acid copolymer, isobutylene/maleic acid copolymer, diisobutylene/maleic acid copolymer, styrene/maleic acid copolymer, and polyethylene glycol monovinyl ether/maleic acid copolymer.

More specifically, the dispersant is selected from one or more of styrene/acrylic acid copolymers, acrylic acid/maleic acid copolymers, acrylic acid/methacrylic acid copolymers, butadiene/acrylic acid copolymers, isobutylene/maleic acid copolymers, diisobutylene/maleic acid copolymers, styrene/maleic acid copolymers, and polyethylene glycol monovinyl ether/maleic acid copolymers produced by BYK, EVONIK, BASF and other companies.

In some preferred embodiments of the present invention, in the environmentally friendly antibacterial and mildew-proof water-based pigment paste, the content of the dispersant is 5-30wt% by weight, which may be determined according to the type of pigment.

Fungicides

In the present invention, the bactericide is an alcohol ether solvent. The alcohol ether solvent added to the water-based pigment paste can penetrate into microorganisms such as bacteria and fungi, react with their proteins to cause protein coagulation, and can also destroy the capsule on the surface of microorganisms. The two factors work synergistically to effectively achieve the effect of sterilization and mildew prevention.

In some embodiments of the present invention, the bactericide is selected from one or more alcohol ether solvents having an average molecular weight of 70-170.

In some preferred embodiments of the present invention, the bactericide is selected from one or more of propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol butyl ether, ethylene glycol ethyl ether, ethylene glycol butyl ether, n-butanol, and 2-phenoxyethanol. Specifically, the bactericide is selected from one or more of propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol butyl ether, ethylene glycol ethyl ether, ethylene glycol butyl ether, n-butanol, and 2-phenoxyethanol produced by Jurong Chemical, Tairong Chemical, Juchuan Chemicals, and other companies.

In some more preferred embodiments of the present invention, in the environmentally friendly antibacterial and mildew-proof water-based pigment paste, the content of the bactericide is 0.5-2.5wt% by weight, which may be determined according to the type of the bactericide.

D

In some embodiments of the present invention, the wetting agent is selected from one or more of modified alkoxylates, polyether-modified siloxanes, ethoxylated acetylenic glycols, and siloxane dual-effect surfactants; specifically, the wetting agent is selected from DOW, One or more of the modified alkoxylates, polyether-modified siloxanes, ethoxylated acetylenic glycols, and siloxane dual-effect surfactants produced by EVONIK and other companies.

In some preferred embodiments of the present invention, in the environmentally friendly antibacterial and mildew-proof water-based pigment paste, the content of the wetting agent is 0-2wt% by weight.

Defoaming agent

In some embodiments of the present invention, the defoamer is selected from one or more of modified polysiloxane and polymer-based defoamers; specifically, the defoamer is selected from one or more of modified polysiloxane and polymer-based defoamers produced by BASF, EVONIK and other companies.

In some preferred embodiments of the present invention, in the environmentally friendly antibacterial and mildew-proof water-based pigment paste, the content of the defoaming agent is 0-1wt% by weight.

Anti-settling agent

In some embodiments of the present invention, the anti-settling agent is selected from one or more of hectorite clay, fumed silica, and polyamide wax; specifically, the anti-settling agent is selected from one or more of hectorite clay, fumed silica, and polyamide wax produced by EVONIK, Himax, and other companies.

In some preferred embodiments of the present invention, the anti-settling agent is fumed silica.

In some more preferred embodiments of the present invention, in the environmentally friendly antibacterial and mildew-proof water-based pigment paste, the content of the anti-settling agent is 0.3-1.5wt% by weight.

The second aspect of the present invention provides a method for preparing the environmentally friendly antibacterial and mildew-proof water-based pigment paste according to the first aspect of the present invention. The machine equipment used in the method is a general equipment in a paint or pigment paste production factory, does not contain complicated processes, can be industrialized and mass-produced, has good practicality, and mainly comprises the following steps:

(1) adding a dispersant, a wetting agent and a defoaming agent according to the formula weight into a portion of water, stirring at a speed of 800-1000 r/min for 10-20 min to obtain a mixture A;

(2) adding a pigment and an anti-settling agent to the mixture A, and dispersing the mixture at a high speed of 1500-2000 r/min for 30 min to obtain a mixture B;

(3) sand-grinding the mixture B, and maintaining the grinding state until the material fineness is dispersed to less than 10 μm, to obtain a mixture C;

(4) Add the fungicide and the remaining water to the mixture C, and stir at a speed of 800-1000 r/min for 10 min to obtain the environmentally friendly antibacterial and mildew-proof water-based pigment paste.

The third aspect of the present invention provides the use of the environmentally friendly antibacterial and mildew-proof water-based pigment paste described in the first aspect of the present invention in water-based industrial coatings, wherein the water-based industrial coatings are selected from one or more of water-based two-component polyurethane coatings, two-component epoxy paints, one-component acrylic coatings, and water-based amino baking varnishes.

The beneficial effects of the present invention are as follows:

The present invention solves the problem that the water-based pigment paste bactericide in the prior art is harmful to human body or environment. The antibacterial and mildew-proof water-based pigment paste uses alcohol ether solvents to replace isothiazolinone and pyridinethione fungicides. The prepared water-based pigment paste is harmless to the environment and human body, and will not be consumed while effectively inhibiting the growth of microorganisms such as bacteria and fungi, and the bactericidal and mildew-proof effect lasts for a long time. The environmentally friendly antibacterial and mildew-proof water-based pigment paste of the present invention has good compatibility with water-based industrial coatings, and will not affect the gloss, water resistance, salt spray resistance and other physical and chemical properties of the coating.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the corresponding standards for reading the number of bacterial species in the color paste antibacterial detection test.

FIG2 is a schematic diagram of the test results of the antibacterial test of the pigment pastes prepared in Examples 1-5 and Comparative Examples 1-5.

Detailed ways

In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the content specifically described below is illustrative and non-restrictive, and protection scope of the present invention should not be limited by this. In the embodiment, if specific techniques or conditions are not indicated, they are carried out according to the technical conditions described in the document in this area or according to the product specification. If the reagents or instruments are not indicated by the manufacturer, they are all conventional products that can be obtained by commercial purchase.

Example 1: Environmentally friendly antibacterial and mildew-proof organic orange pigment paste 1

The environmentally friendly antibacterial and mildew-proof organic orange pigment paste 1 of the present invention is prepared according to the formula in Table 1 below:

Table 1 Formula of environmentally friendly antibacterial and anti-mildew organic orange pigment paste 1

The preparation of the environmentally friendly antibacterial and mildew-proof organic orange pigment paste 1 comprises the following steps:

(1) adding 20.0 wt% of dispersant, 2.0 wt% of wetting agent and 0.3 wt% of defoamer to 25.0 wt% of water according to the formula weight, stirring at a speed of 800-1000 r/min for 10-20 min to obtain a mixture A;

(2) adding 40.0 wt % of pigment to mixture A and dispersing at a speed of 1500-2000 r/min for 30 min to obtain mixture B;

(3) sand-grinding the mixture B, and maintaining the grinding state until the material fineness is dispersed to less than 10 μm, to obtain a mixture C;

(4) Add 0.5 wt % of fungicide and 12.2 wt % of water to the mixture C, and stir at a speed of 800-1000 r/min for 10 min to obtain the environmentally friendly antibacterial and mildew-proof organic orange pigment paste 1.

Example 2: Environmentally friendly antibacterial and mildew-proof carbon black pigment paste 2

The environmentally friendly antibacterial and mildew-proof carbon black pigment paste 2 of the present invention is prepared according to the formula in Table 2 below:

Table 2 Formula of environmentally friendly antibacterial and antifungal carbon black pigment paste 2

The preparation of the environmentally friendly antibacterial and mildew-proof carbon black pigment paste 2 comprises the following steps:

(1) adding 30.0 wt% of dispersant and 0.5 wt% of defoamer according to the formula weight to 30.5 wt% of water, stirring at a speed of 800-1000 r/min for 10-20 min to obtain a mixture A;

(2) adding 30.0 wt% of pigment to mixture A and dispersing at a speed of 1500-2000 r/min for 30 min to obtain mixture B;

(3) sand-grinding the mixture B, and maintaining the grinding state until the material fineness is dispersed to less than 10 μm, to obtain a mixture C;

(4) Add 1.0 wt % of fungicide and 8.0 wt % of water to the mixture C, and stir at a speed of 800-1000 r/min for 10 min to obtain the environmentally friendly antibacterial and mildew-proof carbon black pigment paste 2.

Example 3: Environmentally friendly antibacterial and mildew-proof titanium dioxide pigment paste 3

The environmentally friendly antibacterial and mildew-proof titanium dioxide pigment paste 3 of the present invention is prepared according to the formula in Table 3 below:

Table 3 Formula of environmentally friendly antibacterial and antifungal titanium dioxide pigment paste 3

The preparation of the environmentally friendly antibacterial and mildew-proof titanium dioxide pigment paste 3 comprises the following steps:

(1) adding 15.0 wt% of dispersant and 0.8 wt% of defoamer to 5.2 wt% of water according to the formula weight, stirring at a speed of 800-1000 r/min for 10-20 min to obtain a mixture A;

(2) adding 75.0 wt% of pigment and 1.0 wt% of anti-settling agent to mixture A, and dispersing at a speed of 1500-2000 r/min for 30 min to obtain mixture B;

(3) sand-grinding the mixture B, and maintaining the grinding state until the material fineness is dispersed to less than 10 μm, to obtain a mixture C;

(4) Add 2.0 wt % of fungicide and 1.0 wt % of water to the mixture C, and stir at a speed of 800-1000 r/min for 10 min to obtain the environmentally friendly antibacterial and mildew-proof titanium dioxide pigment paste 3.

Example 4: Environmentally friendly antibacterial and mildew-proof organic red pigment paste 4

The environmentally friendly antibacterial and mildew-proof organic red pigment paste 4 of the present invention was prepared according to the formula in Table 4 below:

Table 4 Formula of environmentally friendly antibacterial and anti-mildew organic red pigment paste 4

The preparation of the environmentally friendly antibacterial and mildew-proof organic red pigment paste 4 comprises the following steps:

(1) adding 20.0 wt% of dispersant, 1.5 wt% of wetting agent and 0.8 wt% of defoamer according to the formula weight to 28.2 wt% of water, stirring at a speed of 800-1000 r/min for 10-20 min to obtain a mixture A;

(2) adding 40.0 wt % of pigment to mixture A and dispersing at a speed of 1500-2000 r/min for 30 min to obtain mixture B;

(3) sand-grinding the mixture B, and maintaining the grinding state until the material fineness is dispersed to less than 10 μm, to obtain a mixture C;

(4) Add 1.0 wt % of fungicide and 8.5 wt % of water to the mixture C, and stir at a speed of 800-1000 r/min for 10 min to obtain the environmentally friendly antibacterial and anti-mildew organic red pigment paste 4.

Example 5: Environmentally friendly antibacterial and mildew-proof organic blue pigment paste 5

The environmentally friendly antibacterial and mildew-proof organic blue pigment paste 5 of the present invention is prepared according to the formula in Table 5 below:

Table 5 Formula of environmentally friendly antibacterial and mildew-proof organic blue pigment paste 5

The preparation of the environmentally friendly antibacterial and mildew-proof organic blue pigment paste 5 comprises the following steps:

(1) adding 25.0 wt% of dispersant, 1.8 wt% of wetting agent and 1.0 wt% of defoamer to 25.2 wt% of water according to the formula weight, stirring at a speed of 800-1000 r/min for 10-20 min to obtain a mixture A;

(2) adding 40.0 wt % of pigment to mixture A and dispersing at a speed of 1500-2000 r/min for 30 min to obtain mixture B;

(3) sand-grinding the mixture B, and maintaining the grinding state until the material fineness is dispersed to less than 10 μm, to obtain a mixture C;

(4) Add 2.0 wt % of fungicide and 5.0 wt % of water to the mixture C, and stir at a speed of 800-1000 r/min for 10 min to obtain the environmentally friendly antibacterial and mildew-proof organic blue pigment paste 5.

Comparative Example 1: Organic orange pigment paste 1 as a comparative example

An equal amount of the fungicide in Example 1 was replaced by water, and other conditions and preparation methods remained unchanged to prepare an organic orange pigment paste 1 as a comparative example.

Comparative Example 2: Carbon black pigment paste 2 as a comparative example

An equal amount of the fungicide in Example 2 was replaced by water, and other conditions and preparation methods remained unchanged to prepare a carbon black pigment paste 2 as a comparative example.

Comparative Example 3: Titanium White Pigment Paste 3 as Comparative Example

The fungicide in Example 3 was replaced by water in equal amount, and the other conditions and preparation method remained unchanged to prepare titanium dioxide pigment paste 3 as a comparative example.

Comparative Example 4: Organic red pigment paste 4 as a comparative example

An equal amount of the fungicide in Example 4 was replaced by water, and other conditions and preparation methods remained unchanged to prepare an organic red pigment paste 4 as a comparative example.

Comparative Example 5: Organic blue pigment paste 5 as a comparative example

An equal amount of the fungicide in Example 5 was replaced by water, and other conditions and preparation methods remained unchanged to prepare an organic blue pigment paste 5 as a comparative example.

Test method for antibacterial detection of color paste

A certain amount of the test microbial suspension is added to the pigment pastes prepared in Examples 1-5 and Comparative Examples 1-5, respectively, and after being mixed evenly, the suspension is observed at a suitable temperature for a certain period of time, and the reproduction of the microorganisms in the sample is regularly observed to determine whether the added bactericide can effectively improve the antibacterial and mildew-proof effect of the product. As the test microorganisms, conventional laboratory test bacteria (mixed bacteria or mixed fungi) are used unless otherwise specified. The specific operation is:

(1) Add 1g of bacterial strain to 99g of color paste product, stir evenly, and store in a 30℃ constant temperature box for 14 days.

(2) Take the color paste after storage and dilute it in a ratio of 1:9. Immerse the test bacteria detection plate in the diluent or pipette the diluent onto the detection plate. After both sides are fully soaked for 10 seconds, let the excess liquid flow off.

(3) The above test plate was placed in a 30°C constant temperature box for two days, and the number of bacterial strains was read. The reading standard was as shown in Figure 1 of the specification.

The pigment pastes prepared in Examples 1-5 and Comparative Examples 1-5 were subjected to antibacterial testing, and the test results are shown in Table 6 and Figure 2 of the specification:

Table 6 Antibacterial test results of pigment pastes of Examples 1-5 and Comparative Examples 1-5

From the results shown in Table 6 and Figure 2 of the specification, it can be seen that after the pigment pastes prepared in Examples 1-5 were stored at 30°C for 14 days, no bacteria or fungi were detected, indicating that they have efficient antibacterial and antifungal effects; while the pigment pastes prepared in Comparative Examples 1-5 After the pigment paste prepared in the experiment was stored at 30° C. for 14 days, colonies of different sizes could be detected. This test shows that the environmentally friendly antibacterial and mildew-proof water-based pigment paste of the present invention can effectively inhibit the growth of microorganisms such as bacteria and fungi, and the bactericidal and mildew-proof effect lasts for a long time.

Example 6: Application of pigment paste in water-based industrial coatings

The pigment pastes prepared in Examples 1-5 were added to water-based baking varnish, water-based two-component polyurethane varnish and water-based two-component epoxy varnish respectively. The specific formulas are shown in Tables 7-9 below.

Table 7 Composition formula of water-based baking varnish in Example 6

Table 8 Composition formula of water-based two-component polyurethane varnish in Example 6

Table 9 Composition formula of water-based two-component epoxy varnish in Example 6

The effects of environmentally friendly antibacterial and anti-mildew water-based pigment paste in water-based baking varnish, water-based two-component polyurethane varnish and water-based two-component epoxy varnish were tested according to the following methods:

1. Gloss (60°) is measured according to GB/T 9754.

2. The salt spray resistance test is carried out according to the neutral salt spray test (NSS test) of GB/T 10125.

3. Water resistance shall be in accordance with the provisions of Method A of GB/T 1733-1993.

The test results are shown in Table 10 below.

Table 10 Test results of the pigment pastes of Examples 1-5 in three kinds of varnishes

As can be seen from Table 10, after the pigment pastes prepared in Examples 1-5 were added to the varnishes of the above three coating systems, the resulting products had high gloss, small color difference after grinding, good compatibility, salt spray resistance and water resistance. This test shows that the environmentally friendly antibacterial and mildew-proof water-based pigment paste described in the present invention has good compatibility with water-based industrial coatings and will not affect the gloss, water resistance, salt spray resistance and other physical and chemical properties of the coating.

Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims (10)

1. An environmentally friendly antibacterial and mildew-proof water-based pigment paste, which comprises, by weight percentage:
   

   The mass percentage of the above components totals 100%, and the feature is that the bactericide is an alcohol ether solvent.
2. The environmentally friendly antibacterial and mildew-proof water-based pigment paste according to claim 1 is characterized in that the bactericide is selected from one or more of alcohol ether solvents with an average molecular weight of 70-170; preferably, the bactericide is selected from one or more of propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol butyl ether, ethylene glycol ethyl ether, ethylene glycol butyl ether, n-butanol, and 2-phenoxyethanol.
3. According to the environmentally friendly antibacterial and mildew-proof water-based pigment paste as described in claim 1 or 2, it is characterized in that, based on the mass percentage, the content of the bactericide in the environmentally friendly antibacterial and mildew-proof water-based pigment paste is preferably 0.5-2.5wt%.
4. The environmentally friendly antibacterial and mildew-proof water-based pigment paste according to claim 1 is characterized in that the pigment is selected from one or more of organic pigments and inorganic pigments; preferably, the organic pigment is selected from one or more of disazo pigments, disazo condensation pigments, dibenzopyrene dione pigments, anthraquinone pigments, anthraquinone pyrimidine pigments, benzimidazolone pigments, quinacridone pigments, quinophthalone pigments, diketopyrrolopyrrole pigments, dioxazine pigments, indanthrone pigments, isoindoline pigments, isoindolinone pigments, perylene pigments, phthalocyanine pigments, and pyrazolequinazolinone pigments, and the inorganic pigment is selected from one or more of titanium dioxide, black iron oxide, iron manganese black, spinel black, carbon black, graphite, chromium oxide iron black, red iron oxide, brown iron oxide, yellow iron oxide, nickel titanium yellow, spinel phase, and bismuth vanadate; more preferably, the content of the pigment in the environmentally friendly antibacterial and mildew-proof water-based pigment paste is 20-70wt% by mass percentage.
5. The environmentally friendly antibacterial and mildew-proof water-based pigment paste according to claim 1 is characterized in that the dispersant is an aqueous dispersant; preferably, the dispersant is selected from one or more of styrene/acrylic acid copolymer, acrylic acid/maleic acid copolymer, acrylic acid/methacrylic acid copolymer, butadiene/acrylic acid copolymer, isobutylene/maleic acid copolymer, diisobutylene/maleic acid copolymer, styrene/maleic acid copolymer, polyethylene glycol monovinyl ether/maleic acid copolymer; more preferably, the content of the dispersant in the environmentally friendly antibacterial and mildew-proof water-based pigment paste is 5-30wt% by mass percentage.
6. The environmentally friendly antibacterial and mildew-proof water-based pigment paste according to claim 1 is characterized in that the wetting agent is selected from one or more of modified alkoxylates, polyether-modified siloxanes, ethoxylated acetylenic glycols, and siloxane dual-effect surfactants; preferably, the content of the wetting agent in the environmentally friendly antibacterial and mildew-proof water-based pigment paste is 0-2wt% by mass percentage.
7. The environmentally friendly antibacterial and mildew-proof water-based pigment paste according to claim 1 is characterized in that the defoaming agent is selected from one or more of modified polysiloxanes and polymer-based defoaming agents; preferably, the content of the defoaming agent in the environmentally friendly antibacterial and mildew-proof water-based pigment paste is 0-1wt% by mass percentage.
8. The environmentally friendly antibacterial and mildew-proof water-based pigment paste according to claim 1 is characterized in that the anti-settling agent is selected from one or more of hectorite clay, fumed silica, and polyamide wax; preferably, the anti-settling agent is fumed silica; more preferably, the content of the anti-settling agent in the environmentally friendly antibacterial and mildew-proof water-based pigment paste is 0.3-1.5wt% by mass percentage.
9. A method for preparing the environmentally friendly antibacterial and mildew-proof water-based pigment paste according to any one of claims 1 to 8, comprising the following steps:

   (1) adding a dispersant, a wetting agent and a defoaming agent according to the formula weight into a portion of water, stirring at a speed of 800-1000 r/min for 10-20 min to obtain a mixture A;

   (2) adding a pigment and an anti-settling agent to the mixture A, and dispersing the mixture at a high speed of 1500-2000 r/min for 30 min to obtain a mixture B;

   (3) sand-grinding the mixture B, and maintaining the grinding state until the material fineness is dispersed to less than 10 μm, to obtain a mixture C;

   (4) Add the fungicide and the remaining water to the mixture C, and stir at a speed of 800-1000 r/min for 10 min to obtain the environmentally friendly antibacterial and mildew-proof water-based pigment paste.
10. The use of the environmentally friendly antibacterial and mildew-proof water-based pigment paste in water-based industrial coatings according to any one of claims 1 to 8 is characterized in that the water-based industrial coating is selected from one or more of water-based two-component polyurethane coatings, two-component epoxy paints, one-component acrylic coatings, and water-based amino baking varnishes.