A kind of water-based dacromet zinc sealing agent and preparation method thereof

Abstract

The present invention relates to a water-based Dacromet zinc-penetrating sealant, which is made of the following raw materials in parts by weight: 50-60 parts of water-based epoxy-modified acrylic resin, 10-15 parts of ionized water, 1.5-3.5 parts of alcohol ester twelve, 0.2-0.5 parts of dimethylethanolamine, 25-35 parts of pigments and fillers, and 2-3 parts of other auxiliary agents, wherein the other auxiliary agents include dispersants, wetting agents and thickeners. The present invention also protects the preparation method of the above-mentioned water-based Dacromet zinc-penetrating sealant. The water-based Dacromet zinc-penetrating sealant of the present invention meets environmental protection requirements, has no volatile odor, and has a simple preparation method. In addition, the hardness, impact strength, adhesion and durability of the film layer after the product of the present invention is coated are significantly improved compared with the existing water-based sealant, so that the Dacromet coating can be effectively protected, and the scratch resistance, corrosion resistance and durability of the parts can be greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water-based paints, and in particular relates to a water-based Dacromet zinc sealing agent and a preparation method thereof. Background Art

[0002] At present, the two common types of sealants used for the Dacromet process (zinc-aluminum coating) or multi-alloy co-penetration coating (high-temperature sherardizing) are oily Dacromet sherardizing sealant and water-based Dacromet sherardizing sealant. Among them, the oily Dacromet sherardizing sealant is a sealant based on organic solvents. It has the characteristics of fast drying after being applied on the original coating or sherardizing coating, uniform film layer and good anti-corrosion effect. However, due to the organic solvent, the oily Dacromet sherardizing sealant may have the problem of volatile organic compounds (VOCs), so its application is limited to certain extent in areas with strict environmental protection.

[0003] Water-based Dacromet zinc sealer is a new type of sealer based on water. It has the characteristics of no organic solvent and harmless to the environment. At the same time, it dries quickly after coating, has high film uniformity, and can be safer and more environmentally friendly in production. Therefore, in today's increasingly environmentally friendly world, water-based Dacromet zinc sealer has received widespread attention and application.

[0004] However, the existing water-based Dacromet zinc-penetrating sealant has low adhesion and hardness after coating, and its durability is generally poor compared with the oil-based Dacromet zinc-penetrating sealant film. Summary of the invention

[0005] The invention aims at the technical problems existing in the prior art and provides a water-based dacromet zinc sealing agent and a preparation method thereof.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A water-based dacromet zinc-penetrating sealant is prepared from the following raw materials in parts by weight: 50-60 parts of water-based epoxy-modified acrylic resin, 10-15 parts of ionized water, 1.5-3.5 parts of alcohol ester dodecanedione, 0.2-0.5 parts of dimethylethanolamine, 25-35 parts of pigments and fillers, and 2-3 parts of other additives, wherein the other additives include a dispersant, a wetting agent and a thickener.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the water-based dacromet zinc sealing agent is made of the following raw materials in parts by weight: 55-58 parts of water-based epoxy modified acrylic resin, 10-15 parts of ionized water, 2.5-3.5 parts of alcohol ester dodecanedione, 0.3-0.4 parts of dimethylethanolamine, 29-32 parts of pigments and fillers, and 2-3 parts of other additives.

[0010] Furthermore, the mass ratio of the dispersant, the wetting agent and the thickener is (0.8-0.9):(0.1-0.3):1.

[0011] Furthermore, the waterborne epoxy-modified acrylic resin has a solid content of 63-67 wt %, a viscosity of 5000-7000 mPa·s / 25° C., and an acid value of 28-32 mg·KOH / g.

[0012] Furthermore, the pigment filler is an environmentally friendly water-based pigment.

[0013] Furthermore, the thickener is water-based thickening powder.

[0014] The present invention also protects a method for preparing the above-mentioned water-based Dacromet zincizing sealant, comprising the following steps:

[0015] S1. The amount of waterborne epoxy modified acrylic resin, dimethylethanolamine and other additives were mixed with ionized water and stirred at a speed of more than 300 rpm for 0.5-1h to obtain a mixed solution;

[0016] S2. Add the formulated amount of pigment and filler to the mixture obtained in S1 and mix thoroughly to obtain a semi-finished sealant;

[0017] S3. Add the formulated amount of alcohol ester twelve to the semi-finished sealant obtained in S2, stir at a speed of more than 300 rpm for 0.5-1h to obtain a finished water-based Dacromet zinc sealing agent.

[0018] Based on the above technical solution, the present invention has the following improvements.

[0019] Furthermore, in S2, the mixed liquid and the pigment and filler are fully mixed by ball milling, the ball milling speed is 60-80r / min, and the ball milling time is 1.5-3h.

[0020] The beneficial effects of the present invention are: firstly, the water-based Dacromet zinc-penetrating sealant of the present invention meets environmental protection requirements, has no volatile odor, and has a simple preparation method; secondly, the hardness, impact strength, adhesion and durability of the film layer of the product of the present invention after coating are significantly improved compared with the existing water-based sealant, thereby effectively protecting the Dacromet coating and significantly improving the scratch resistance, corrosion resistance and durability of the parts. DETAILED DESCRIPTION

[0021] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0022] Unless otherwise specified, the raw materials used in the specific embodiments of the present invention are conventional raw materials in the field of the present technology and can be purchased on the market. Among them, the water-based epoxy-modified acrylic resin uses Tuchuan Chemical TC-101B, the dispersant uses BYK-156 dispersant, and the wetting agent uses TEGO Dispers 652 wetting agent, Hongrun HR-8160 wetting agent or Ona F940 wetting agent. The test methods and detection methods in the following embodiments are all conventional methods unless otherwise specified, and the instruments and equipment used in the test can be obtained through commercial channels. The parts not elaborated in detail in this specification belong to the prior art.

[0023] The present application discloses a water-based dacromet zinc sealing agent, which is prepared from the following raw materials in parts by weight: 50-60 parts of water-based epoxy modified acrylic resin, 10-15 parts of ionized water, 1.5-3.5 parts of alcohol ester dodecanedione, 0.2-0.5 parts of dimethylethanolamine, 25-35 parts of pigments and fillers, and 2-3 parts of other additives, wherein the other additives include dispersants, wetting agents and thickeners.

[0024] The method is prepared by a specific preparation method, comprising the following steps:

[0025] S1. The amount of waterborne epoxy modified acrylic resin, dimethylethanolamine and other additives were mixed with ionized water and stirred at a speed of more than 300 rpm for 0.5-1h to obtain a mixed solution;

[0026] S2. Add the formulated amount of pigment and filler to the mixture obtained in S1 and mix thoroughly to obtain a semi-finished sealant;

[0027] S3. Add the formula amount of alcohol ester twelve to the semi-finished sealant obtained in S2, stir at a speed of more than 300rpm for 0.5-1h to obtain a finished water-based Dacromet zinc sealant;

[0028] Among them, in S2, the mixed liquid and the pigment and filler are fully mixed by ball milling, the ball milling speed is 60-80r / min, and the ball milling time is 1.5-3h to control the particle size, so that the one-time film is less than or equal to 25μm, otherwise it will be sealed because the surface dries too quickly and the water inside is not completely evaporated, affecting the water resistance, adhesion and hardness; the water resistance is best after the co-solvent and water in the paint film are completely evaporated.

[0029] The following are examples of the present application.

[0030] Example 1

[0031] The aqueous Dacromet zinc sealing agent of Example 1 of the present invention is prepared by the following steps:

[0032] S1. Take 50Kg of water-based epoxy-modified acrylic resin, 0.2Kg of dimethylethanolamine, 0.7Kg of dispersant, 0.3Kg of wetting agent and 1Kg of aqueous thickening powder, put into a stirring device, add 15Kg of deionized water and mix, stir at 300rpm for 1h to obtain a mixed solution;

[0033] S2. 25 kg of environmentally friendly water-based pigment was added to the mixture obtained in S1, and the semi-finished sealant was obtained by ball milling. The ball milling speed was 60 r / mi n, and the ball milling time was 3 h.

[0034] S3. Add 1.5 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 300 rpm for 1 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0035] Example 2

[0036] The aqueous dacromet zinc sealing agent of Example 2 of the present invention is prepared by the following steps:

[0037] S1. Take 52Kg of water-based epoxy-modified acrylic resin, 0.25Kg of dimethylethanolamine, 0.9Kg of dispersant, 0.4Kg of wetting agent and 0.9Kg of aqueous thickening powder, put into a stirring device, add 14Kg of deionized water and mix, stir at 600rpm for 0.75h to obtain a mixed solution;

[0038] S2. 27Kg of environmentally friendly water-based pigment was added to the mixture obtained in S1, and the semi-finished sealant was obtained by ball milling. The ball milling speed was 70r / mi n, and the ball milling time was 2.5h;

[0039] S3. Add 1.8 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 600 rpm for 0.75 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0040] Example 3

[0041] The aqueous Dacromet zinc sealing agent of Example 3 of the present invention is prepared by the following steps:

[0042] S1. Take 54Kg of water-based epoxy-modified acrylic resin, 0.3Kg of dimethylethanolamine, 1.2Kg of dispersant, 0.5Kg of wetting agent and 1.3Kg of water-based thickening powder, put into a stirring device, add 12Kg of deionized water and mix, stir at 800rpm for 0.5h to obtain a mixed solution;

[0043] S2. Add 30Kg of environmentally friendly water-based pigment to the mixture obtained in S1, and mix by ball milling to obtain a semi-finished sealant at a ball milling speed of 70r / mi n for 2h;

[0044] S3. Add 2.3 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 300 rpm for 1 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0045] Example 4

[0046] The aqueous Dacromet zinc sealing agent of Example 4 of the present invention is prepared by the following steps:

[0047] S1. Take 60Kg of water-based epoxy-modified acrylic resin, 0.5Kg of dimethylethanolamine, 1.1Kg of dispersant, 0.4Kg of wetting agent and 1Kg of aqueous thickening powder, put into a stirring device, add 10Kg of deionized water and mix, stir at 300rpm for 1h to obtain a mixed solution;

[0048] S2. Add 35Kg of environmentally friendly water-based pigment to the mixture obtained in S1, and mix by ball milling to obtain a semi-finished sealant at a ball milling speed of 80r / mi n for 1.5h;

[0049] S3. Add 3.5 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 600 rpm for 0.75 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0050] Example 5

[0051] The aqueous Dacromet zinc sealing agent of Example 5 of the present invention is prepared by the following steps:

[0052] S1. Take 55Kg of water-based epoxy-modified acrylic resin, 0.3Kg of dimethylethanolamine, 0.8Kg of dispersant, 0.4Kg of wetting agent and 0.9Kg of water-based thickening powder, put into a stirring device, add 12Kg of deionized water and mix, stir at 600rpm for 0.75h to obtain a mixed solution;

[0053] S2. 29Kg of environmentally friendly water-based pigment was added to the mixture obtained in S1, and the semi-finished sealant was obtained by ball milling. The ball milling speed was 60r / mi n, and the ball milling time was 3h;

[0054] S3. Add 2.5 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 800 rpm for 0.5 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0055] Example 6

[0056] The aqueous Dacromet zinc sealing agent of Example 6 of the present invention is prepared by the following steps:

[0057] S1. Take 56.5Kg of water-based epoxy-modified acrylic resin, 0.35Kg of dimethylethanolamine, 1.1Kg of dispersant, 0.3Kg of wetting agent and 1Kg of aqueous thickening powder, put into a stirring device, add 13Kg of deionized water and mix, stir at 300rpm for 1h to obtain a mixed solution;

[0058] S2. Add 30.5Kg of environmentally friendly water-based pigment to the mixture obtained in S1, and mix by ball milling to obtain a semi-finished sealant at a ball milling speed of 70r / mi n for 2.5h;

[0059] S3. Add 3 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 600 rpm for 0.75 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0060] Example 7

[0061] The aqueous Dacromet zinc sealing agent of Example 7 of the present invention is prepared by the following steps:

[0062] S1. Take 58Kg of water-based epoxy-modified acrylic resin, 0.4Kg of dimethylethanolamine, 1.2Kg of dispersant, 0.4Kg of wetting agent and 1.2Kg of aqueous thickening powder, put into a stirring device, add 14Kg of deionized water and mix, stir at 300rpm for 1h to obtain a mixed solution;

[0063] S2. 32 kg of environmentally friendly water-based pigment was added to the mixture obtained in S1, and the semi-finished sealant was obtained by ball milling at a speed of 80 r / mi n for 1.5 h;

[0064] S3. Add 3.5 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 800 rpm for 0.5 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0065] Example 8

[0066] The aqueous dacromet zinc sealing agent of Example 8 of the present invention is prepared by the following steps:

[0067] S1. Take 56Kg of water-based epoxy-modified acrylic resin, 0.32Kg of dimethylethanolamine, 0.8Kg of dispersant, 0.3Kg of wetting agent and 1Kg of water-based thickening powder, put into a stirring device, add 13Kg of deionized water and mix, stir at 600rpm for 0.75h to obtain a mixed solution;

[0068] S2. Add 30Kg of environmentally friendly water-based pigment to the mixture obtained in S1, and mix by ball milling to obtain a semi-finished sealant at a ball milling speed of 70r / mi n for 2h;

[0069] S3. Add 3 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 300 rpm for 1 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0070] Example 9

[0071] The aqueous Dacromet zinc sealing agent of Example 9 of the present invention is prepared by the following steps:

[0072] S1. Take 57Kg of water-based epoxy-modified acrylic resin, 0.4Kg of dimethylethanolamine, 0.9Kg of dispersant, 0.1Kg of wetting agent and 1Kg of aqueous thickening powder, put into a stirring device, add 14Kg of deionized water and mix, stir at 600rpm for 0.75h to obtain a mixed solution;

[0073] S2. Add 32Kg of environmentally friendly water-based pigment to the mixture obtained in S1, and mix by ball milling to obtain a semi-finished sealant at a ball milling speed of 80r / mi n for 1.5h;

[0074] S3. Add 3.5 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 600 rpm for 0.75 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0075] Example 10

[0076] The aqueous Dacromet zinc sealing agent of Example 10 of the present invention is prepared by the following steps:

[0077] S1. Take 53Kg of water-based epoxy-modified acrylic resin, 0.3Kg of dimethylethanolamine, 0.85Kg of dispersant, 0.2Kg of wetting agent and 1Kg of water-based thickening powder, put into a stirring device, add 12Kg of deionized water and mix, stir at 300rpm for 1h to obtain a mixed solution;

[0078] S2. 28Kg of environmentally friendly water-based pigment was added to the mixture obtained in S1, and the semi-finished sealant was obtained by ball milling. The ball milling speed was 70r / mi n, and the ball milling time was 2.5h;

[0079] S3. Add 2 kg of alcohol ester twelve to the semi-finished sealant obtained in S2 and stir at 800 rpm for 0.5 h to obtain the water-based dacromet zinc sealing agent of the present embodiment.

[0080] Performance testing:

[0081] Taking JF-AR88 water-based sealant and HF727 water-based Dacromet sealant as comparative examples 1 and 2, and taking the water-based Dacromet zinc-penetrating sealant prepared in Examples 1-10 of the present application as an example, the Dacromet coating on the surface of the parts was sealed, dried and solidified, and the film thickness was 20 μm. Then, the film was tested for hardness according to GB / T6739-2006; the film was tested for impact strength according to GB / T1732-93; the film was tested for adhesion according to GB1720-89; the film was tested for water resistance according to GB / T1733-93; and the film was tested for salt spray according to GB / T1771-91. The specific test results are shown in Table 1 below.

[0082] Table 1 Test results of Examples 1-10 and Comparative Examples 1-2

[0083]

[0084] It can be seen from the data in Table 1 that the water-based Dacromet zinc sealant prepared in the present application has significantly improved film hardness, impact strength, adhesion and durability after coating compared with the currently commercially available water-based sealants, thereby effectively protecting the Dacromet coating and significantly improving the scratch resistance, corrosion resistance and durability of the parts. In addition, it can be seen from Examples 8-10 that when the mass ratio of the dispersant, wetting agent and thickener is (0.8-0.9): (0.1-0.3): 1, the comprehensive performance of the film layer can be further improved.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A water-based Dacromet zinc sealing agent, characterized in that: Prepared by the following steps: S1. Take 56Kg of water-based epoxy-modified acrylic resin, 0.32Kg of dimethylethanolamine, 0.8Kg of dispersant, 0.3Kg of wetting agent and 1Kg of aqueous thickening powder, put into a stirring device, add 13Kg of deionized water and mix, stir at 600rpm for 0.75h to obtain a mixed solution; S2. Add 30Kg of environmentally friendly water-based pigment to the mixture obtained in S1, and mix by ball milling to obtain a semi-finished sealant at a ball milling speed of 70r / min for a ball milling time of 2h; S3. Add 3 kg of alcohol ester twelve to the semi-finished sealant obtained in S2, and stir at 300 rpm for 1 hour to obtain the water-based Dacromet zinc sealing agent.

2. A water-based Dacromet zinc sealing agent, characterized in that: Prepared by the following steps: S1. Take 57Kg of water-based epoxy-modified acrylic resin, 0.4Kg of dimethylethanolamine, 0.9Kg of dispersant, 0.1Kg of wetting agent and 1Kg of aqueous thickening powder, put into a stirring device, add 14Kg of deionized water and mix, stir at 600rpm for 0.75h to obtain a mixed solution; S2. Add 32Kg of environmentally friendly water-based pigment to the mixture obtained in S1, and mix by ball milling to obtain a semi-finished sealant at a ball milling speed of 80r / min for a ball milling time of 1.5h; S3. Add 3.5 kg of alcohol ester twelve to the semi-finished sealant obtained in S2, and stir at 600 rpm for 0.75 h to obtain the water-based dacromet zinc sealing agent.

Images