Water-based environment-friendly coating and preparation process thereof

Abstract

The present application relates to the technical field of water-based paint, in particular to a kind of water-based environmental protection paint and its preparation process, comprising: water-based acrylic emulsion, deionized water, modified glass flake and modified nano titanium dioxide are poured into dispersing machine and are uniformly stirred, and mixed material is obtained;Dispersing agent, defoaming agent, thickening agent and film-forming aid are added to the mixed material, and continue to be uniformly stirred, to prepare water-based environmental protection paint.The present application realizes the covering enhancement of glass flake by depositing boron nitride particle layer on the surface of glass flake, overcomes the problem that glass flake is large in brittleness and not resistant to impact;Then the surface of glass flake is modified using silane coupling agent, so that it can be better dispersed in acrylic emulsion, improves the compatibility of modified glass flake and emulsion matrix, thereby improving the quality of final paint.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water-based paint technology, in particular to a water-based environment-friendly paint and a preparation process thereof. BACKGROUND

[0002] The water-based environment-friendly paint is a paint using water as a diluent and containing no organic solvent, which has the characteristics of non-toxic, non-irritating odor, no environmental pollution, full paint film, and easy to use. The water-based acrylic anticorrosive paint has good application in the fields of metal, furniture and automobile.

[0003] Some water-based acrylic anticorrosive paints use glass flake as an anticorrosive filler. The core principle is that the glass flake can form a unique shielding protection structure in the coating to isolate the corrosive medium from the matrix and hinder the corrosive medium from penetrating the coating, thereby reducing the erosion of the matrix by the corrosive material. However, the glass flake itself has the problems of high brittleness and easy mechanical damage. When the coating formed by the glass flake is subjected to external impact, the internal glass flake will be broken, resulting in easy damage and peeling of the coating surface, which seriously affects the quality of the water-based acrylic anticorrosive paint. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a water-based environment-friendly paint and a preparation process thereof, which improves the corrosion resistance of the paint by using modified glass flake and modified nano-titanium dioxide in combination.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a water-based environment-friendly paint, comprising the following raw materials by weight: water-based acrylic emulsion 60-70 parts, modified glass flake 15-25 parts, modified nano-titanium dioxide 5-10 parts, dispersing agent 0.5-1 part, defoaming agent 0.2-0.5 part, thickening agent 0.5-0.8 part, film-forming aid 0.5-1 part, and deionized water 10-15 parts.

[0006] Preferably, the solid content of the water-based acrylic emulsion is 60%; the dispersing agent is BYK-190 type dispersing agent or BYK-110 type dispersing agent; and the defoaming agent is TEGO810 type defoaming agent or TEGO960W type defoaming agent.

[0007] Preferably, the thickening agent is BASF Rheovis AS1130 or BASF Rheovis AS1125; and the film-forming aid is ethylene glycol ether or propylene glycol phenyl ether.

[0008] Preferably, the preparation method of the modified glass flake is as follows: S1, ultrasonic cleaning and drying the glass flake, and then placing it in a deposition furnace; S2, introducing nitrogen, boron trichloride and ammonia into the deposition furnace for deposition reaction, and then cooling the furnace to room temperature after the deposition reaction is completed to obtain pretreated glass flake.

[0009] S3, coating the surface of the pretreated glass flake with a silane coupling agent to obtain modified glass flake.

[0010] Preferably, in step S1, the size of the glass flake is 100-200 mu m.

[0011] Preferably, in step S2, the specific process of the deposition reaction is as follows: the flow ratio of nitrogen, boron trichloride and ammonia is 50:10:1, the deposition reaction pressure is 45 mbar, the deposition reaction temperature is 750 DEG C, and the deposition reaction time is 4 h.

[0012] Preferably, the modified nano-titanium dioxide is coated on the surface of the nano-titanium dioxide with a silane coupling agent.

[0013] Preferably, the silane coupling agent is any one or a combination of silane coupling agent KH-550, silane coupling agent KH-560 and silane coupling agent KH-570.

[0014] The application further provides a preparation process of the water-based environment-friendly paint, which comprises the following steps:

[0015] (1) uniformly stirring water-based acrylic emulsion, deionized water, modified glass flake and modified nano-titanium dioxide in a dispersing machine to obtain a mixture;

[0016] (2) adding a dispersing agent, a defoaming agent, a thickening agent and a film-forming aid to the mixture and continuously stirring to obtain the water-based environment-friendly paint.

[0017] The application provides a water-based environment-friendly paint and a preparation process thereof, and has the following beneficial effects compared with the prior art:

[0018] The application realizes the coverage and enhancement of the glass flake by depositing a boron nitride particle layer on the surface of the glass flake, overcomes the problem of large brittleness and poor impact resistance of the glass flake, and modifies the surface of the glass flake with a silane coupling agent, so that the modified glass flake can be better dispersed in the acrylic emulsion, the compatibility of the modified glass flake and the emulsion matrix is improved, and the quality of the final paint is improved.

[0019] The application combines the use of modified glass flake and modified nano-titanium dioxide to improve the corrosion resistance of the coating; specifically, the modified glass flake can be arranged in parallel and stacked in the coating, forming a dense anti-permeation layer similar to fish scales, greatly prolonging the path and time of medium permeation, and improving the anti-permeation performance and corrosion resistance of the coating; and the nano-titanium dioxide is dispersed in the connection gaps of the modified glass flake, which can further improve the corrosion resistance of the paint. DETAILED DESCRIPTION

[0020] The following examples are used to illustrate the embodiments of the present application in detail, so that the application of technical means to solve technical problems and achieve technical effects can be fully understood and implemented.

[0021] Example 1

[0022] The preparation method of the modified glass flake is as follows:

[0023] S1, the glass flake with a size of 100-200 μm is ultrasonically cleaned and dried, and then placed in a deposition furnace.

[0024] S2, nitrogen, boron trichloride and ammonia are introduced into the deposition furnace at a flow ratio of 50:10:1 for deposition reaction, and after the deposition reaction is completed, the furnace is cooled to room temperature, and the pretreated glass flake is prepared; during the process, the deposition reaction pressure is 45 mbar, the deposition reaction temperature is 750℃, and the deposition reaction time is 4h.

[0025] S3, the pretreated glass flake surface is coated with silane coupling agent KH-550 to prepare modified glass flake.

[0026] Example 2

[0027] The same as example 1, the difference is that the silane coupling agent KH-550 is replaced by KH-560.

[0028] Example 3

[0029] The same as example 1, the difference is that the silane coupling agent KH-550 is replaced by KH-570

[0030] Example 4

[0031] An aqueous environmental protection coating, comprising the following raw materials by weight: 70 parts of water-based acrylic emulsion with a solid content of 60%, 15 parts of modified glass flake, 10 parts of modified nano-titanium dioxide, 0.5 parts of BYK-190 type dispersant, 0.5 parts of TEGO810 type defoamer, 0.5 parts of BASF Rheovis AS1130 type thickener, 1 part of ethylene glycol ether, and 10 parts of deionized water. The modified nano-titanium dioxide is coated on the surface of the nano-titanium dioxide by using silane coupling agent KH-550.

[0032] A preparation process of an aqueous environmental protection coating, comprising the following steps:

[0033] (1) the water-based acrylic emulsion, deionized water, modified glass flake and modified nano-titanium dioxide are poured into a dispersing machine for uniform stirring to obtain a mixture;

[0034] (2) adding dispersant, defoaming agent, thickening agent and film forming aid into the mixture, continuing to stir uniformly, to obtain the water-based environmental protection coating.

[0035] In this embodiment, the modified glass flake in Example 1 is used.

[0036] Example 5

[0037] A water-based environmental protection coating includes the following raw materials by weight: water-based acrylic emulsion with solid content of 60% 60 parts, modified glass flake 25 parts, modified nano-titanium dioxide 5 parts, BYK-110 type dispersant 1 part, TEGO960W type defoaming agent 0.2 parts, BASF Rheovis AS1125 type thickening agent 0.8 parts, propylene glycol phenyl ether 0.5 parts, deionized water 15 parts. The modified nano-titanium dioxide is coated on the surface of nano-titanium dioxide by using silane coupling agent KH-560.

[0038] A preparation process of a water-based environmental protection coating includes the following steps:

[0039] (1) uniformly stirring water-based acrylic emulsion, deionized water, modified glass flake and modified nano-titanium dioxide in a dispersing machine to obtain a mixture;

[0040] (2) adding dispersant, defoaming agent, thickening agent and film forming aid into the mixture, continuing to stir uniformly, to obtain the water-based environmental protection coating.

[0041] In this embodiment, the modified glass flake in Example 2 is used.

[0042] Example 6

[0043] A water-based environmental protection coating includes the following raw materials by weight: water-based acrylic emulsion with solid content of 60% 65 parts, modified glass flake 20 parts, modified nano-titanium dioxide 8 parts, BYK-190 type dispersant 0.6 parts, TEGO810 type defoaming agent 0.4 parts, BASF Rheovis AS1130 type thickening agent 0.6 parts, ethylene glycol ether 0.8 parts, deionized water 12 parts. The modified nano-titanium dioxide is coated on the surface of nano-titanium dioxide by using silane coupling agent KH-570.

[0044] A preparation process of a water-based environmental protection coating includes the following steps:

[0045] (1) uniformly stirring water-based acrylic emulsion, deionized water, modified glass flake and modified nano-titanium dioxide in a dispersing machine to obtain a mixture;

[0046] (2) adding dispersant, defoaming agent, thickening agent and film forming aid into the mixture, continuing to stir uniformly, to obtain the water-based environmental protection coating.

[0047] In this embodiment, the modified glass flake in Example 3 is used.

[0048] Comparative Example 1

[0049] An aqueous environmental-friendly coating includes the following raw materials by weight: 65 parts of an aqueous acrylic emulsion with a solid content of 60%, 20 parts of modified glass flake, 0.6 parts of BYK-190 type dispersant, 0.4 parts of TEGO810 type defoamer, 0.6 parts of BASF Rheovis AS1130 type thickener, 0.8 parts of ethylene glycol ether, and 12 parts of deionized water.

[0050] A preparation process of an aqueous environmental-friendly coating includes the following steps:

[0051] (1) Pour the aqueous acrylic emulsion, deionized water, and modified glass flake into a dispersing machine for uniform stirring to obtain a mixture;

[0052] (2) Add the dispersant, defoamer, thickener, and film-forming aid to the mixture, and continue to stir uniformly to obtain the aqueous environmental-friendly coating.

[0053] In this comparative example, the modified glass flake in Example 3 is used.

[0054] Comparative Example 2

[0055] The same as Example 6, except that the modified glass flake is replaced by pretreated glass flake.

[0056] Comparative Example 3

[0057] The same as Example 6, except that the modified glass flake is prepared as follows:

[0058] S1, ultrasonically clean and dry the glass flake with a size of 100-200 μm, and then put it into a deposition furnace.

[0059] S2, coat the surface of the cleaned glass flake with silane coupling agent KH-550 to obtain the modified glass flake.

[0060] Comparative Example 4

[0061] An aqueous environmental protection coating, comprising the following raw materials by weight: 65 parts of an aqueous acrylic emulsion with a solid content of 60%, 20 parts of modified glass flake of Comparative Example 3, 10 parts of modified boron nitride, 8 parts of modified nano-titanium dioxide, 0.6 parts of a dispersing agent of BYK-190 type, 0.4 parts of a defoaming agent of TEGO 810 type, 0.6 parts of a thickening agent of BASF Rheovis AS1130 type, 0.8 parts of ethylene glycol ether, and 12 parts of deionized water. The modified nano-titanium dioxide is coated on the surface of nano-titanium dioxide by using silane coupling agent KH-570. The modified boron nitride is coated on the surface of boron nitride by using silane coupling agent KH-570.

[0062] A preparation process of an aqueous environmental protection coating, comprising the following steps:

[0063] (1) Pouring the aqueous acrylic emulsion, deionized water, modified glass flake of Comparative Example 3, modified nano-titanium dioxide and modified boron nitride into a dispersing machine for uniform stirring to obtain a mixture;

[0064] (2) Adding a dispersing agent, a defoaming agent, a thickening agent and a film-forming aid into the mixture, and continuing to stir uniformly to prepare the aqueous environmental protection coating.

[0065] Quality detection

[0066] 1. The technical indexes of the aqueous environmental protection coatings in Example 6 and Comparative Examples 1-4 are detected. The specific detection results are shown in the following table.

[0067] Table 1 Coating performance

[0068] Item Standard Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Hardness GB 6739 2H H 2H H 2H Impact resistance, cm GB / T 1732 56 48 48 42 50 Salt spray resistance, h GB / T 1771 735 596 558 542 627 Elongation at break, % GB / T 528 621 567 537 541 588 Tensile strength, MPa GB / T 528 1.45 1.28 1.27 1.21 1.34 Artificial aging, 1500 h GB / T 1826 Dust 2nd grade Dust 2nd grade Dust 3rd grade Dust 3rd grade Dust 2nd grade

[0069] From the above table, it can be seen that:

[0070] (1) Compared with Example 6, the coating in Comparative Example 1 performs weakly in salt spray resistance, indicating that the combination of modified glass flake and modified nano-titanium dioxide can further improve the corrosion resistance of the coating.

[0071] (2) The coatings in Comparative Examples 2-3 perform worse than the coating in Example 6 in salt spray resistance, impact resistance and strength, indicating that the deposition of boron nitride on the surface of glass flake and the treatment of silane coupling agent can greatly improve the quality of the coating.

[0072] (3) Compared with Example 6, the quality of the coating in Comparative Example 4 is still a little bit poor, indicating that the deposition of boron nitride on the surface of glass flake can better improve the quality of the coating.

[0073] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A water-based environmentally friendly coating, characterized in that, The raw materials include the following parts by weight: 60-70 parts of water-based acrylic emulsion, 15-25 parts of modified glass flakes, 5-10 parts of modified nano titanium dioxide, 0.5-1 part of dispersant, 0.2-0.5 parts of defoamer, 0.5-0.8 parts of thickener, 0.5-1 part of film-forming aid, and 10-15 parts of deionized water; The modified glass flakes are prepared as follows: S1. The glass flakes are ultrasonically cleaned and dried, and then placed in a deposition furnace. S2. Nitrogen, boron trichloride and ammonia are introduced into the deposition furnace to carry out the deposition reaction. After the deposition reaction is completed, the furnace is cooled to room temperature to obtain pretreated glass flakes. S3. The surface of the pretreated glass flakes is coated with a silane coupling agent to obtain modified glass flakes. In step S1, the size of the glass flakes is 100-200 μm; In step S2, the specific process of the deposition reaction is as follows: the flow ratio of nitrogen, boron trichloride and ammonia is 50:10:1, the deposition reaction pressure is 45 mbar, the deposition reaction temperature is 750℃, and the deposition reaction time is 4 h.

2. The water-based environmentally friendly coating according to claim 1, characterized in that, The aqueous acrylic emulsion has a solid content of 60%; the dispersant is BYK-190 or BYK-110; and the defoamer is TEGO810 or TEGO960W.

3. The water-based environmentally friendly coating according to claim 1, characterized in that, The thickener is BASF Rheovis AS1130 or BASF Rheovis AS1125; the film-forming aid is ethylene glycol ethyl ether or propylene glycol phenyl ether.

4. The water-based environmentally friendly coating according to claim 1, characterized in that, The modified nano-titanium dioxide is coated with a silane coupling agent.

5. The water-based environmentally friendly coating according to claim 1 or 4, characterized in that, The silane coupling agent is any one or a combination of silane coupling agents KH-550, KH-560, and KH-570.

6. The preparation process of the water-based environmentally friendly coating according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Aqueous acrylic emulsion, deionized water, modified glass flakes and modified nano titanium dioxide were poured into a disperser and stirred evenly to obtain a mixture; (2) Add dispersant, defoamer, thickener and film-forming aid to the mixture and continue to stir evenly to obtain water-based environmentally friendly coating.