Resin composition for improving shrinkage cavity of water-based colored paint as well as preparation method and application of resin composition

Abstract

The invention relates to a resin composition for improving water-based colored paint shrinkage cavities, which comprises the following components in parts by weight: 40-50 parts of dispersion resin, 20-30 parts of barium sulfate, 20-40 parts of pure water and 0.3-0.8 part of defoaming agent. The resin composition for improving the shrinkage cavity of the water-based colored paint adopts barium sulfate as a main component for solving the shrinkage cavity property of the water-based colored paint, and has the advantages of simplicity in operation, no influence on other properties of the paint, no color change, low addition cost and the like. After the resin composition for improving the shrinkage cavity of the water-based colored paint is added, the problem of shrinkage cavity or pollution to a cylinder body and a line body caused by shrinkage cavity cannot occur, the solving method is rapid and convenient, and the time cost can be saved. The invention also relates to a preparation method and application of the resin composition for improving the shrinkage cavity of the water-based colored paint.

Description

Technical Field

[0001] The invention relates to the field of water-based coatings, and in particular to a resin composition for improving shrinkage cavities in water-based paints, and a preparation method and application thereof. Background Art

[0002] The shrinkage of water-based paint refers to the shrinkage phenomenon on the surface of the wet film after the water-based paint is sprayed. The shrinkage can be caused by the contamination of the substrate with oil or other impurities, the application of the next coat of paint without sanding the old paint or the topcoat, the long construction interval between two coats of paint, the improper selection of defoaming agent in the paint, and the poor recoatability of the paint.

[0003] Difference in surface tension is the main cause of shrinkage. Existing studies have shown that low coating viscosity is conducive to coating flow, and low thixotropy increases the coating flow time, which is not conducive to the control of shrinkage. Therefore, the existing technology generally reduces the shrinkage source that causes the difference in surface tension of the coating and improves the viscosity and thixotropy of the coating to effectively resist the formation of shrinkage.

[0004] In the existing water-based paint technology field, there are generally two ways to improve the shrinkage of water-based paint. One is to solve the shrinkage of water-based paint by increasing the rotation speed and adding anti-shrinkage additives, but this method will cause other paint film defects and color differences; the other is to solve the shrinkage of water-based paint by adding oil removal filter bags, but in actual operation, it cannot guarantee that the shrinkage problem will be completely solved, and there is a possibility of accidental and unsolvable.

[0005] In view of the above reasons, it is urgent to develop a resin composition for improving shrinkage cavities of water-based paint to solve the problems existing in the prior art. Summary of the invention

[0006] Based on the above facts, the purpose of the present invention is to provide a resin composition for improving shrinkage cavities in water-based paint, which uses barium sulfate as the main component to solve the shrinkage cavities of water-based paint, and has the advantages of simple operation, no effect on other properties of the coating, no color change, and low addition cost. After adding the resin composition for improving shrinkage cavities in water-based paint, shrinkage cavities or the problem of contaminating the cylinder body and the line body due to shrinkage cavities will no longer occur, and the solution is fast and convenient, which can save time and cost. The present invention also relates to the preparation method and application of the resin composition for improving shrinkage cavities in water-based paint.

[0007] The first aspect of the present invention provides a resin composition for improving shrinkage cavities in water-based paint, wherein the components thereof comprise, by weight:

[0008] Dispersed resin 40-50 parts

[0009] Barium sulfate 20-30 parts

[0010] 20-40 parts pure water

[0011] Defoaming agent 0.3-0.8 parts.

[0012] Dispersion resin

[0013] In some embodiments of the present invention, the dispersion resin is an acrylic resin. The acrylic resin can be selected from any commercially available product, including but not limited to the acrylic resin model ACW-1011 (Zhongshan) provided by DIC and the acrylic resin model ACW-1033 provided by Nippon Paint Co., Ltd.

[0014] Barium sulfate

[0015] In the present invention, the addition of barium sulfate can effectively improve the shrinkage cavity occurrence rate of water-based paint.

[0016] In some embodiments of the present invention, the barium sulfate can be selected from any commercially available product, including but not limited to barium sulfate of model MM045 provided by Dalong Manganese Industry and model BARIFINE BF-21 provided by Sakai Chemical of Japan.

[0017] Defoaming agent

[0018] In the present invention, the defoaming agent can effectively solve the problem of increased foam volume during the barium sulfate grinding stage.

[0019] In some embodiments of the present invention, the defoaming agent can be selected from any commercially available product, including but not limited to defoaming agents of model BYK011 and BYK021 provided by BYK.

[0020] The second aspect of the present invention provides a method for preparing the resin composition for improving shrinkage cavities of water-based paint according to the first aspect of the present invention, comprising the following steps:

[0021] S1: Add dispersing resin, part of pure water and defoaming agent into a container and disperse for 10 minutes, then add barium sulfate and stir at high speed for 10-30 minutes to obtain mixture A;

[0022] S2: sand-grinding the mixture A, controlling the sand-grinding temperature to be below 40° C., until the fineness is ≤5 μm, to obtain a mixture B;

[0023] S3: Diluting the mixture B with the remaining pure water to obtain the resin composition for improving shrinkage cavities of water-based paint.

[0024] The third aspect of the present invention provides a use of the resin composition for improving shrinkage cavities of water-based paints according to the first aspect of the present invention for improving shrinkage cavities of water-based paints. It should be noted that the resin composition for improving shrinkage cavities of water-based paints can be added to the water-based paints at any time without any process adjustment, i.e., it can be added in advance or added later.

[0025] In some preferred embodiments of the present invention, the amount of the resin composition for improving shrinkage cavities of water-based paint is 1-10% of the water-based paint in terms of mass percentage.

[0026] The fourth aspect of the present invention provides a method for improving shrinkage cavities in water-based paint, that is, adding the resin composition for improving shrinkage cavities in water-based paint described in the first aspect of the present invention. It should be noted that the resin composition for improving shrinkage cavities in water-based paint can be added to the water-based paint at any time without any process adjustment, that is, it can be added in advance or added later.

[0027] In some preferred embodiments of the present invention, the amount of the resin composition for improving shrinkage cavities of water-based paint is 1-10% of the water-based paint in terms of mass percentage.

[0028] The beneficial effects of the present invention are as follows:

[0029] The present invention aims at the deficiencies in the prior art and provides a resin composition for improving shrinkage cavities in water-based paint. The resin composition innovatively uses barium sulfate as the main component to solve the shrinkage cavities of water-based paint, improves the shrinkage cavities of water-based paint, and has the advantages of simple operation, no effect on other properties of the coating, no color change, and low addition cost. After adding the resin composition for improving shrinkage cavities in water-based paint, shrinkage cavities or the problem of contamination of the cylinder body and the line body caused by shrinkage cavities will no longer occur. The solution is fast and convenient, and can save time and cost. The present invention also relates to a preparation method and application of the resin composition for improving shrinkage cavities in water-based paint. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with specific examples. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention. The experimental methods used in the following examples are conventional methods unless otherwise specified, and the raw materials and reagents used are products that can be purchased from conventional commercial channels unless otherwise specified.

[0031] Example 1-2: Resin composition 1-2 for improving shrinkage cavities in water-based paint

[0032] According to the formula in Table 1, a resin composition 1-2 for improving shrinkage cavities in water-based paint was prepared. The preparation method was carried out according to the following steps:

[0033] S1: Add dispersing resin, pure water and defoaming agent into a container and disperse for 10 minutes, then add barium sulfate and stir at high speed for 10-30 minutes to obtain mixture A;

[0034] S2: sand-grinding the mixture A, controlling the sand-grinding temperature to be below 40° C., until the fineness is ≤5 μm, to obtain a mixture B;

[0035] S3: Dilute the mixture B with pure water to obtain the resin composition 1-2 for improving shrinkage cavities in water-based paint.

[0036] Comparative Example 1: Resin composition 1 as a comparative example

[0037] A resin composition 1 as a comparative example was prepared according to the formula in Table 1. The preparation method was as follows:

[0038] S1: Add dispersing resin, pure water and defoaming agent into a container and disperse for 10 minutes, then add talcum powder and stir at high speed for 10-30 minutes to obtain mixture A;

[0039] S2: sand-grinding the mixture A, controlling the sand-grinding temperature to be below 40° C., until the fineness is ≤5 μm, to obtain a mixture B;

[0040] S3: Dilute the mixture B with pure water to obtain the resin composition 1 as a comparative example.

[0041] Comparative Example 2-3: Resin composition 2-3 as a comparative example

[0042] According to the formula in Table 1, resin compositions 2-3 as comparative examples were prepared, and the preparation methods were all carried out according to the following steps:

[0043] S1: Add dispersing resin, pure water and defoaming agent into a container and disperse for 10 minutes, then add barium sulfate and stir at high speed for 10-30 minutes to obtain mixture A;

[0044] S2: sand-grinding the mixture A, controlling the sand-grinding temperature to be below 40° C., until the fineness is ≤5 μm, to obtain a mixture B;

[0045] S3: Dilute the mixture B with pure water to obtain the resin composition 2-3 as a comparative example.

[0046] Table 1 Formula table of Examples 1-2 and Comparative Examples 1-3

[0047]

[0048] The actual effects of the resin compositions obtained in Examples 1-2 and Comparative Examples 1-3 were tested by taking AR 2000 3R3 water-based paint as an example. The dosage of each test example is shown in Table 2.

[0049] Table 2 Test Example 1-11 Formula Table

[0050]

[0051]

[0052] The shrinkage cavities of Test Examples 1-11 after normal coating are shown in Table 3.

[0053] Table 3 Shrinkage amount of test examples 1-11

[0054]

[0055] The color difference data of test examples 1-11 after addition are shown in Table 4.

[0056] Table 4 Color difference data of test examples 1-11

[0057]

[0058] The actual effects of the resin compositions obtained in Examples 1-2 and Comparative Examples 1-3 were tested using AR 2000 1F7 water-based paint as an example. The dosage of each test example is shown in Table 5.

[0059] Table 5 Test Example 12-22 Formula Table

[0060]

[0061] The shrinkage cavities of test examples 12-22 after normal coating are shown in Table 6.

[0062] Table 6 Shrinkage amount of test examples 12-22

[0063]

[0064] The color difference data of test examples 12-22 after addition are shown in Table 7.

[0065] Table 7 Color difference data of test examples 12-22

[0066]

[0067] As shown in Tables 2-7, Test Examples 1 and 12 are reference examples in which no other components are added; Test Examples 2, 3, 13, and 14 show that after adding the resin composition for improving shrinkage cavities in water-based paints of the present invention, shrinkage cavities will no longer occur, and the cost of addition is low, and it will not affect other properties of the coating and will not cause color changes; Tests 4, 5, 6, 15, 16, and 17 show that adding dispersants, defoamers, leveling agents and other additives cannot improve the shrinkage cavities problem, and the cost of addition is relatively high, and the color difference is obvious; Tests 7, 8, 9, 18, 19, and 20 show that adding a resin composition that is not prepared according to the requirements of the present invention will cause shrinkage cavities and obvious color differences; Test Examples 10, 11, 21, and 22 show that adding too much or too little of the resin composition for improving shrinkage cavities in water-based paints will still cause shrinkage cavities and produce color differences.

[0068] 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 based on 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

1. A resin composition for improving shrinkage cavities of water-based paint, comprising, by weight:

2. The resin composition for improving shrinkage cavities of water-based paint according to claim 1, characterized in that: The dispersion resin is an acrylic resin; preferably, the dispersion resin is selected from one or more of the acrylic resins of model ACW-1011 (Zhongshan) provided by DIC and model ACW-1033 provided by Nippon Paint Co., Ltd.

3. The resin composition for improving shrinkage cavities of water-based paint according to claim 1, characterized in that: The barium sulfate is selected from one or more of the barium sulfates of model MM045 provided by Dalong Manganese Industry and model BARIFINE BF-21 provided by Sakai Chemical of Japan.

4. The resin composition for improving shrinkage cavities of water-based paint according to claim 1, characterized in that: The defoaming agent is selected from one or more of the defoaming agents of BYK011 and BYK021 provided by BYK.

5. A method for preparing a resin composition for improving shrinkage cavities in water-based paint according to any one of claims 1 to 4, characterized in that: The steps include: S1: Add dispersing resin, part of pure water and defoaming agent into a container and disperse for 10 minutes, then add barium sulfate and stir at high speed for 10-30 minutes to obtain mixture A; S2: sand-grinding the mixture A, controlling the sand-grinding temperature to be below 40° C., until the fineness is ≤5 μm, to obtain a mixture B; S3: diluting the mixture B with the remaining pure water to obtain the resin composition for improving shrinkage cavities of water-based paint.

6. A use of the resin composition for improving shrinkage cavities in water-based paints according to any one of claims 1 to 4 for improving shrinkage cavities in water-based paints.

7. The use of the resin composition for improving shrinkage cavities in water-based paint according to claim 6, characterized in that: Calculated by mass percentage, the amount of the resin composition for improving shrinkage cavities of water-based paint accounts for 1-10% of the water-based paint.

8. A method for improving shrinkage cavities of water-based paint, characterized in that: Add the resin composition for improving shrinkage cavities in water-based paint as described in any one of claims 1 to 4.

9. The method for improving shrinkage cavities of water-based paint according to claim 8, characterized in that: Calculated by mass percentage, the amount of the resin composition for improving shrinkage cavities of water-based paint accounts for 1-10% of the water-based paint.

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