CN110894385A

CN110894385A - Single-component aqueous environment-friendly industrial crack paint and preparation method thereof

Info

Publication number: CN110894385A
Application number: CN201911236033.5A
Authority: CN
Inventors: 马祥格; 姜凤冕; 郑同同; 党勇
Original assignee: Shandong Seven Reform Materials Co Ltd
Current assignee: Shandong Seven Reform Materials Co Ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-03-20

Abstract

The invention relates to the technical field of crack paints, in particular to a single-component water-based environment-friendly industrial crack paint and a preparation method thereof, wherein the crack paint comprises a crack paint primer and a crack paint finish, and the crack paint primer comprises the following components: deionized water A, a wetting dispersant, bentonite, a first defoaming agent, a black pigment, kaolin, mica powder, an antirust pigment, an acrylic emulsion, silica sol, an anti-flash rust agent, a second defoaming agent, a thickening agent and deionized water B, wherein the crack paint finish comprises: the coating comprises water-based aluminum paste, deionized water, a wetting dispersant, silica sol, a silver powder directional auxiliary agent, an anti-flash rust agent, a defoaming agent and a thickening agent; the preparation method comprises a preparation method of the crack lacquer primer and a preparation method of the crack lacquer finish. The crackle paint disclosed by the invention is green and environment-friendly, has good high-temperature resistance and mechanical properties, can be self-dried at normal temperature, is uniform in grain cracking, and is simple in preparation method.

Description

Single-component aqueous environment-friendly industrial crack paint and preparation method thereof

Technical Field

The invention relates to the technical field of crack paints, in particular to a single-component aqueous environment-friendly industrial crack paint and a preparation method thereof.

Background

The crack paint is a paint with special decorative effect, so that the crack paint is named after the coating, can form scattered cracks, can protect and decorate the surface of an object, and can improve the added value of a product, so that the crack paint is widely applied to the fields of home decoration, artware and the like.

Most of common industrial crack paints on the market at present are solvent-based paints, which contain a large amount of organic solvents, and the paints can release a large amount of VOCS (volatile organic Compounds) during production and use, so that the production and the body health of users are seriously harmed, the atmosphere is polluted, and the ecological environment is damaged; although the water-based paint can reduce VOCS (volatile organic compounds) brought by organic solvents in the paint, the water-based paint used in the market at present contains different contents of cosolvent and film-forming additive, and can also cause harm to human bodies and pollution to the environment. In a word, the existing crack paints on the market generally have the defects of poor environmental protection, more volatile substances in a solvent, larger smell and the like. In addition, most crack paint products on the market have the defects of difficult construction, uneven surface cracking and the like.

Therefore, the water-based environment-friendly industrial crack paint which can improve the current situation of crack paint products, reduce the damage of the paint to human bodies and the pollution to the environment, and has good construction performance, easy construction and uniform crack effect is very necessary to provide.

Disclosure of Invention

Aiming at the problems of large VOCS release amount, difficult construction and uneven surface cracking of the existing crack paint, the invention provides the single-component aqueous environment-friendly industrial crack paint and the preparation method thereof.

In a first aspect, the invention provides a single-component aqueous environmentally-friendly industrial crack lacquer, which comprises a single-component aqueous environmentally-friendly industrial crack lacquer primer and a single-component aqueous environmentally-friendly industrial crack lacquer finish;

the crack paint primer comprises the following components in parts by weight: 5-20 parts of deionized water A, 0.1-1.5 parts of wetting dispersant, 0.05-0.3 part of bentonite, 0.05-0.3 part of first-class defoaming agent, 0.1-1.5 parts of black pigment, 5-20 parts of kaolin, 1-10 parts of mica powder, 1-15 parts of antirust pigment, 25-45 parts of acrylic emulsion, 15-35 parts of silica sol, 0.1-1.5 parts of flash rust inhibitor, 0.05-0.3 part of second-class defoaming agent, 0.1-1.0 part of thickening agent and 0.38-10 parts of deionized water B1;

the crack paint finish comprises the following components in parts by weight: 1-15 parts of water-based aluminum paste, 15-30 parts of deionized water, 1-10 parts of wetting dispersant, 40-70 parts of silica sol, 1-5 parts of silver powder directional assistant, 0.1-1.5 parts of flash rust inhibitor, 0.05-0.3 part of defoaming agent and 0.1-1.0 part of thickening agent.

Preferably, the crack lacquer primer comprises the following components in parts by weight: 10-20 parts of deionized water A, 0.5-1.5 parts of wetting dispersant, 0.05-0.15 part of bentonite, 0.05-0.15 part of first-class defoaming agent, 0.5-1.5 parts of black pigment, 10-20 parts of kaolin, 1-6 parts of mica powder, 1-10 parts of antirust pigment, 25-35 parts of acrylic emulsion, 15-25 parts of silica sol, 0.5-1.5 parts of flash rust inhibitor, 0.05-0.1 part of second-class defoaming agent, 0.1-0.5 part of thickening agent and 1-6 parts of deionized water B;

the crack paint finish comprises the following components in parts by weight: 1-10 parts of water-based aluminum paste, 15-25 parts of deionized water, 1-6 parts of wetting dispersant, 50-70 parts of silica sol, 1-3 parts of silver powder directional assistant, 0.1-1.0 part of flash rust inhibitor, 0.05-0.15 part of defoaming agent and 0.1-0.5 part of thickening agent.

Further, in the crack lacquer primer, the wetting dispersant is a modified polyacrylate high molecular polymer solution, such as Afcona4599S, which is suitable for co-grinding;

the first type of defoaming agent is an organic silicon defoaming agent, such as digao 810, and the defoaming efficiency is high;

the black pigment is copper-chromium black, such as 2800 of Hangzhou Sitan new material Co., Ltd, and has good temperature resistance;

kaolin was purchased from Shanghai Haimai Co., Ltd;

mica powder was purchased from hebei xinfa mining ltd;

the anti-rust pigment is a high-temperature resistant anti-rust pigment and is purchased from Hangzhou Stent pigment Co.Ltd;

the acrylic emulsion has good temperature resistance and quick drying, and is purchased from lotus leaf chemical company Limited in Foshan City;

the silica sol has good temperature resistance and good compatibility with acrylic emulsion, and is purchased from Shandong Baite New Material Co., Ltd;

the anti-flash rust agent is CK25 of Enze chemical Co., Ltd in Qingdao, and has excellent anti-flash rust effect;

the second type of defoaming agent is polyether siloxane copolymer, such as digao 902W, which has high defoaming efficiency and easy dispersion;

the thickener was a polyurethane thickener purchased from modesty.

Further, in the crack paint finish, the waterborne aluminum paste is purchased from Asahi chemical industry Co., Ltd;

the wetting dispersant is BYK 190;

the silica sol is M3010 of Shandong Baite new material company Limited, and has good temperature resistance;

the silver powder orientation auxiliary agent is rheology modified wax emulsion, such as BYK8421, and has silver powder orientation and precipitation prevention effects;

the defoaming agent is an organic silicon defoaming agent, such as digao 810, and the defoaming efficiency is high;

the thickening agent is BYK420, has the functions of thickening, anti-settling and anti-sagging, and can keep the storage stability of the product.

In a second aspect, the invention provides a preparation method of the single-component aqueous environmental-friendly industrial crack lacquer, which comprises a preparation method of the single-component aqueous environmental-friendly industrial crack lacquer primer and a preparation method of the single-component aqueous environmental-friendly industrial crack lacquer surface lacquer;

the preparation method of the crack lacquer primer comprises the following steps:

1) adding deionized water A into a grinding cylinder, and slowly adding a wetting dispersant, bentonite and a first class defoamer into the grinding cylinder while stirring;

2) adding black pigment, kaolin, mica powder and anti-rust pigment in sequence, fully stirring, adding grinding pickaxe beads, replacing a grinding disc, opening condensed water, and starting grinding until the fineness of water slurry is less than or equal to 30 microns;

3) taking out the ground water slurry for later use;

4) taking a new coating tank, replacing the new coating tank with a dispersion disc, sequentially adding the acrylic emulsion and the silica sol into the tank, and slowly adding the water slurry into the tank while stirring;

5) sequentially adding the flash rust inhibitor, the second type defoaming agent, the thickening agent and the deionized water B into a tank, dispersing and filtering, removing filter residues, and finishing the preparation of the crack lacquer primer;

the preparation method of the crack paint finish comprises the following steps:

1) sequentially adding the waterborne aluminum paste, the deionized water and the dispersing agent into a tank, stirring for 15-20 min, and uniformly dispersing;

2) taking a new coating tank, adding silica sol into the tank, slowly adding the aluminum paste mixed in the step (1) into the tank while stirring, and continuously dispersing until the aluminum paste is uniform;

3) and adding the silver powder directional auxiliary agent, the flash rust prevention agent, the defoaming agent and the thickening agent into the tank in sequence, dispersing and filtering, removing filter residues, and finishing the preparation of the crackle paint finish.

Further, the preparation method of the crack lacquer primer comprises the following steps:

1) adding deionized water A into a grinding cylinder, and slowly adding a dispersing agent, bentonite and a first defoaming agent into the grinding cylinder in sequence under stirring at the rotating speed of 900-1200 rpm/min, wherein the rotating speed of 900-1200 rpm/min can ensure that the dispersing agent and the defoaming agent are fully dispersed, and the bentonite is prevented from being agglomerated due to poor dispersion;

2) adjusting the rotating speed to 400-600 rpm/min, adding the black pigment, kaolin, mica powder and anti-rust pigment in sequence, fully stirring for 15-20 min, adding grinding pickaxe beads, changing a grinding disc, opening condensed water, adjusting the rotating speed to 3000-3500 rpm/min, starting grinding until the fineness of water slurry is less than or equal to 30 microns, and preventing the black pigment, the kaolin, the mica powder and the anti-rust pigment from flying at the rotating speed of 400-600 rpm/min;

3) taking out the ground water slurry for later use;

4) taking a new paint tank, replacing a dispersion disc, sequentially adding acrylic emulsion and silica sol into the tank, slowly adding water slurry into the tank under low-speed stirring at 400-600 rpm/min, uniformly mixing under low-speed stirring at 400-600 rpm/min, and easily causing paint liquid splashing and emulsion breaking of the emulsion when the speed is too high;

5) and increasing the rotating speed to 700-900 rpm/min, sequentially adding the anti-flash rust agent, the second type defoaming agent, the thickening agent and the deionized water B into the tank, dispersing for 15-20 minutes, filtering, removing filter residues, and finishing the preparation of the crack paint base, wherein the uniform dispersion of the anti-flash rust agent, the second type defoaming agent and the thickening agent can be ensured at the rotating speed of 700-900 rpm/min.

Furthermore, the adding amount of the grinding pickaxe beads is 75-85% of the total grinding mass, and the grinding pickaxe beads with the total grinding mass of 80% are added to obtain a good grinding effect.

Further, the preparation method of the crack paint finish paint comprises the following steps:

1) sequentially adding the waterborne aluminum paste, the deionized water and the dispersing agent into a tank, stirring at the rotating speed of 400-600 rpm/min for 15-20 min, uniformly dispersing, and selecting the speed of 400-600 rpm/min to uniformly stir the waterborne aluminum paste, the deionized water and the dispersing agent, wherein the aluminum paste is easily blackened due to overhigh speed;

2) adding silica sol into a new coating tank, slowly adding the aluminum paste mixed in the step (1) into the tank under the stirring of 400-600 rpm/min, and continuously dispersing for 5-10 min until the aluminum paste is uniform, so that the phenomenon that the aluminum paste is easily blackened when the rotating speed is too high is avoided;

3) the rotating speed is increased to 800-1000 rpm/min, the silver powder directional auxiliary agent, the flash rust prevention agent, the defoaming agent and the thickening agent are sequentially added into a tank, the mixture is dispersed for 15-20 minutes, the filter residue is filtered, the crack paint finish is manufactured, the silver powder directional auxiliary agent, the flash rust prevention agent, the defoaming agent and the thickening agent can be uniformly stirred at the rotating speed of 800-1000 rpm/min, and a higher speed is not selected for reducing the influence of the rotating speed on the aluminum silver paste.

The single-component water-based environment-friendly industrial crack paint has the advantages that,

(1) the crack paint primer film forming substance comprises organic nano emulsion and inorganic emulsion, the organic nano emulsion and the inorganic emulsion are organically combined to form a compact and continuous film together with pigments and fillers, and the crack paint primer film forming substance has the characteristics of good adhesive force and excellent mechanical strength; the crack paint surface paint film forming substance is silica sol, and has the characteristics of good temperature resistance, excellent adhesion with a primer layer, normal-temperature self-drying and high drying speed;

(2) through creative selection of components and dosage, excellent temperature resistance, mechanical strength and construction performance can be achieved on the premise of not using any cosolvent and film-forming additive, specifically, the paint can bear the temperature of more than 200 ℃ for a long time, a 1kg weight falls from the height of 50cm, no crack and no drop are caused by impact, the pencil hardness exceeds 2H, the paint can be self-dried at normal temperature and has high drying speed, meanwhile, the environmental protection of the paint is ensured, and the zero emission of VOC can be realized;

(3) the crack lacquer has simple construction method and uniform grain cracking.

On the other hand, the invention also provides a preparation method of the single-component water-based environment-friendly industrial crack lacquer, which comprises the preparation of the crack lacquer primer and the crack lacquer finish, and the components added in each step are uniformly dispersed by creatively adjusting the rotating speed of each step in the preparation process, so that the stability of the properties of the primer and the finish is ensured.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The raw materials used by the crack lacquer of the invention are all products which can be directly purchased from the market, in particular,

in the crack lacquer primer, the wetting dispersant is Afcona 4599S; the first type of defoamer is digao 810; the black pigment is 2800 of Hangzhou Sitan new material company Limited; kaolin was purchased from Shanghai Haimai Co., Ltd; mica powder was purchased from hebei xinfa mining ltd; the rust preventive pigment was purchased from Hangzhou Stant pigment Co., Ltd; the acrylic emulsion is purchased from lotus leaf chemical company Limited in Foshan City; silica sol was purchased from Shandong Baite New materials, Inc.; the flash rust inhibitor is CK25 of Enze chemical Co., Ltd; the second type of antifoaming agent is digao 902W; thickeners were purchased from modesty;

in the crack paint finish, the waterborne aluminum paste is purchased from Asahi chemical Co., Ltd; the wetting dispersant is BYK 190; the silica sol is M3010 of Shandong Baite New Material Co., Ltd; the silver powder orientation auxiliary agent is BYK 8421; the flash rust inhibitor is CK25 of Enze chemical Co., Ltd; the defoaming agent is digao 810; the thickener is BYK 420.

Example 1 Single-component aqueous environmental-friendly industrial crack lacquer

The raw material components of the crack lacquer are shown in table 1 by weight parts.

1) adding deionized water into a grinding cylinder, slowly adding a dispersing agent, bentonite and a first defoaming agent into the grinding cylinder in sequence under the stirring of the rotation speed of 1000rpm/min, ensuring that the dispersing agent and the defoaming agent are fully dispersed at the rotation speed of 1000rpm/min, and preventing the bentonite from being dispersed badly and agglomerating;

2) adjusting the rotating speed to 500rpm/min, adding the black pigment, kaolin, mica powder and anti-rust pigment in sequence, fully stirring for 18min, adding grinding pickaxe beads with the total grinding mass of 80%, replacing a grinding disc, opening condensed water, adjusting the rotating speed to 3500rpm/min, starting grinding until the fineness of water slurry is less than or equal to 30 microns, preventing the black pigment, the kaolin, the mica powder and the anti-rust pigment from flying at the rotating speed of 500rpm/min, and adding the grinding pickaxe beads with the total grinding mass of 80% to obtain a better grinding effect;

3) taking out the ground water slurry for later use;

4) taking a new paint tank, replacing a dispersion disc, sequentially adding acrylic emulsion and silica sol into the tank, slowly adding water slurry into the tank under low-speed stirring of 500rpm/min, wherein the water slurry can be uniformly mixed under low-speed stirring of 500rpm/min, and paint liquid splashing and emulsion breaking are easily caused by overhigh speed;

5) increasing the rotating speed to 800rpm/min, sequentially adding the anti-flash rust agent, the second type defoaming agent, the thickening agent and deionized water into a tank, dispersing for 18 minutes, filtering, removing filter residues, and finishing the preparation of the crack paint primer, wherein the uniform dispersion of the anti-flash rust agent, the second type defoaming agent and the thickening agent can be ensured at the rotating speed of 800 rpm/min;

the preparation method of the crack paint finish comprises the following steps:

1) sequentially adding the waterborne aluminum paste, the deionized water and the dispersing agent into a tank, stirring at 500rpm/min for 18min, uniformly dispersing, selecting the speed of 500rpm/min to uniformly stir the waterborne aluminum paste, the deionized water and the dispersing agent, and easily blackening the aluminum paste when the speed is too high;

2) adding silica sol into a new coating tank, slowly adding the aluminum paste mixed in the step (1) into the tank under the stirring of 500rpm/min, and continuously dispersing for 8min until the aluminum paste is uniform, so that the phenomenon that the aluminum paste is easily blackened when the rotating speed is too high is avoided;

3) the rotating speed is increased to 900rpm/min, the silver powder directional auxiliary agent, the flash rust prevention agent, the defoaming agent and the thickening agent are sequentially added into a tank, the mixture is dispersed for 18 minutes, the filter residue is filtered, the crack paint finish is manufactured, the silver powder directional auxiliary agent, the flash rust prevention agent, the defoaming agent and the thickening agent can be uniformly stirred at the rotating speed of 900rpm/min, and a higher speed is not selected in order to reduce the influence of the rotating speed on the aluminum silver paste.

Examples 2 to 4

As shown in table 1, examples 2 to 4 are different from example 1 in the raw material composition of the crack lacquer.

Table 1 examples 1-4 raw material components (unit: parts) of crack lacquer

Test example 1

The crack paints of the above examples 1 to 4 were subjected to the performance test, and the test results are shown in the following table 2.

Table 2 examples 1-4 crack lacquer performance test results

Test results show that the single-component aqueous environment-friendly industrial crack paint provided by the invention has good high temperature resistance and mechanical properties.

Example 5

As shown in table 3, example 5 differs from example 1 in the amounts of silica sol and acrylic emulsion used for the crack lacquer primer.

Comparative examples 1 to 2

As shown in Table 3, comparative examples 1-2 differ from example 1 in the amount of silica sol and acrylic emulsion used in the crack lacquer primer.

TABLE 3 amount of silica sol and acrylic emulsion used in examples 1 and 5 and comparative examples 1 to 2 (unit: parts)

Raw materials	Example 1	Example 5	Comparative example 1	Comparative example 2
					Acrylic emulsion	31.5	25.0	39.5	12.5
Silica sol	16.0	22.5	8.0	35.0

Test example 2

The crack paints of example 5 and comparative examples 1 to 2 were subjected to the performance test, and the test results are shown in table 4 below.

TABLE 4 test results of crack lacquer properties of example 5 and comparative examples 1-2

Performance of	Example 1	Example 5	Comparative example 1	Comparative example 2
					Adhesion (lattice drawing method)	Level 1	Level 1	Grade 3	Stage 2
Impact resistance (kg cm)	50	50	20	30
					Hardness of	2H	2H	H	H

According to the test results in Table 4, the invention can adjust the dosage of the acrylic emulsion and the silica sol to make the adhesion, the impact resistance and the hardness of the crack lacquer reach higher levels.

Comparative example 3

Comparative example 3 differs from example 1 in that the crack lacquer top-coat of comparative example 3 is prepared by a method comprising the steps of:

1) sequentially adding the waterborne aluminum paste, deionized water and a dispersing agent into a tank, stirring at the rotating speed of 500rpm/min for 18min, and uniformly dispersing;

2) adding silica sol into a new coating tank, slowly adding the aluminum paste mixed in the step (1) into the tank under the stirring of 750rpm/min, and continuously dispersing for 8 min;

3) and increasing the rotating speed to 900rpm/min, sequentially adding the silver powder orientation auxiliary agent, the flash rust prevention agent, the defoaming agent and the thickening agent into a tank, dispersing for 18 minutes, filtering, removing filter residues, and finishing the preparation of the crack paint finish.

Comparative example 4

Comparative example 4 differs from example 1 in that the crack lacquer top-coat of comparative example 4 is prepared by a method comprising the steps of:

2) adding silica sol into a new coating tank, slowly adding the aluminum paste mixed in the step (1) into the tank under the stirring of 250rpm/min, and continuously dispersing for 8 min;

Test example 3

The crack paints of the embodiment 1 and the comparative examples 3 to 4 are respectively adopted for construction, and the wall surface after construction is observed. In the embodiment 1, after the crack paint is constructed, crack lines are cracked uniformly, the surface of a coating film is smooth and flat, the covering power is high, and the metal feeling is obvious; comparative example 3 after the crack paint construction, crack lines crack unevenly, the coating covering power is reduced, the coating is black and white and large-area spots appear locally; comparative example 4 after the crack paint construction, the crack lines are not uniform, and the coating film has particles with uneven height.

Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The single-component aqueous environmental-friendly industrial crack lacquer is characterized by comprising a single-component aqueous environmental-friendly industrial crack lacquer primer and a single-component aqueous environmental-friendly industrial crack lacquer finish;

2. The one-component aqueous environmentally friendly industrial crack lacquer according to claim 1, wherein the crack lacquer primer comprises, in parts by weight: 10-20 parts of deionized water A, 0.5-1.5 parts of wetting dispersant, 0.05-0.15 part of bentonite, 0.05-0.15 part of first-class defoaming agent, 0.5-1.5 parts of black pigment, 10-20 parts of kaolin, 1-6 parts of mica powder, 1-10 parts of antirust pigment, 25-35 parts of acrylic emulsion, 15-25 parts of silica sol, 0.5-1.5 parts of flash rust inhibitor, 0.05-0.1 part of second-class defoaming agent, 0.1-0.5 part of thickening agent and 1-6 parts of deionized water B.

3. The one-component aqueous environmentally friendly industrial crack lacquer according to claim 1, wherein the crack lacquer finish comprises the following components in parts by weight: 1-10 parts of water-based aluminum paste, 15-25 parts of deionized water, 1-6 parts of wetting dispersant, 50-70 parts of silica sol, 1-3 parts of silver powder directional assistant, 0.1-1.0 part of flash rust inhibitor, 0.05-0.15 part of defoaming agent and 0.1-0.5 part of thickening agent.

4. The single-component aqueous environmentally friendly industrial crack lacquer according to claim 1, wherein in the crack lacquer primer, the wetting dispersant is a modified polyacrylate high polymer solution, the first type of defoamer is an organosilicon defoamer, the black pigment is copper chromium black, the second type of defoamer is a polyether siloxane copolymer, and the thickener is a polyurethane thickener.

5. The single-component aqueous environmentally friendly industrial crack lacquer according to claim 1, wherein in the crack lacquer finish, the silver powder orientation aid is a rheology modified wax emulsion and the defoamer is an organosilicon defoamer.

6. The method for preparing a one-component aqueous environmentally friendly industrial crackle paint according to claim 1, wherein the method comprises a method for preparing a one-component aqueous environmentally friendly industrial crackle paint primer and a method for preparing a one-component aqueous environmentally friendly industrial crackle paint topcoat;

3) taking out the ground water slurry for later use;

the preparation method of the crack paint finish comprises the following steps:

7. The method for preparing a one-component aqueous environmentally friendly industrial crack lacquer according to claim 6, wherein the method for preparing the crack lacquer primer comprises the following steps:

1) adding deionized water A into a grinding cylinder, and slowly adding a dispersing agent, bentonite and a first defoaming agent into the grinding cylinder in sequence under stirring at the rotating speed of 900-1200 rpm/min;

2) adjusting the rotating speed to 400-600 rpm/min, adding the black pigment, kaolin, mica powder and anti-rust pigment in sequence, fully stirring for 15-20 min, adding grinding pickaxe beads, changing a grinding disc, opening condensed water, adjusting the rotating speed to 3000-3500 rpm/min, and starting grinding until the fineness of water slurry is less than or equal to 30 microns;

3) taking out the ground water slurry for later use;

4) taking a new coating tank, replacing a dispersion disc, sequentially adding the acrylic emulsion and the silica sol into the tank, and slowly adding the water slurry into the tank under the condition of low-speed stirring at 400-600 rpm/min;

5) and increasing the rotating speed to 700-900 rpm/min, sequentially adding the anti-flash rust agent, the second type defoaming agent, the thickening agent and the deionized water B into the tank, dispersing for 15-20 minutes, filtering, removing filter residues, and finishing the preparation of the crack paint base.

8. The preparation method of the single-component aqueous environmentally friendly industrial crack lacquer according to claim 6, wherein the addition amount of the grinding pick bead is 75-85% of the total grinding mass.

9. The preparation method of the single-component aqueous environmental-friendly industrial crack lacquer as claimed in claim 6, wherein the preparation method of the crack lacquer finish paint comprises the following steps:

1) sequentially adding the waterborne aluminum paste, deionized water and a dispersing agent into a tank, stirring at 400-600 rpm/min for 15-20 min, and uniformly dispersing;

2) adding silica sol into a new coating tank, slowly adding the aluminum paste mixed in the step (1) into the tank under the stirring of 400-600 rpm/min, and continuously dispersing for 5-10 min until the aluminum paste is uniform;

3) and increasing the rotating speed to 800-1000 rpm/min, sequentially adding the silver powder directional auxiliary agent, the flash rust prevention agent, the defoaming agent and the thickening agent into the tank, dispersing for 15-20 minutes, filtering, removing filter residues, and finishing the preparation of the crack paint finish.