Water-based protective decorative coating for living container and preparation method of water-based protective decorative coating

Abstract

The invention discloses a water-based protective decorative coating for a living container and a preparation method of the water-based protective decorative coating, and relates to the technical field of coatings. The water-based paint mainly comprises water, water-based alkyd resin, IPDI (isophorone diisocyanate), water-based acrylic emulsion, titanium dioxide, barium sulfate, a dispersing agent, a defoaming agent, an anti-flash-rust agent, a base material wetting agent, a drier, a PH (potential of hydrogen) regulator and a thickening agent. IPDI polyurethane modified water-based alkyd resin and water-based acrylic emulsion are mutually modified and are matched with a certain amount of base material wetting agent to prepare the protective decorative coating for the living container, which has excellent oil shrinkage resistance, good initial water resistance, high gloss and high fullness. The coating has a high-gloss and high-fullness decorative effect, is a water-based system, is safe and environment-friendly, has low VOC content, can adopt common spraying, brush coating, roller coating and other construction processes, and forms less solid-phase wastes.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based protective decorative coating for a residential container and a preparation method thereof. Background Art

[0002] Container housing refers to a temporary housing that can be installed and disassembled on site. It has a fast installation cycle, is quick and convenient to install, can be disassembled and moved, does not damage the land, is safe, economical and durable, and can be recycled. We can see these containers on construction sites. They provide a safe and comfortable living environment for people on construction sites, and provide people with various temporary houses to meet people's various daily needs. We can also see container houses in other places, providing lounges and hotels for people gathering during festivals, temporary warehouses for manufacturers, small and flexible personal shops for self-employed individuals, and security booths, newsstands, etc.

[0004] The vast majority of container housing paints currently in use are solvent-based paints, which are flammable and explosive, have high volatile organic compound (VOC) content, and pose a huge hazard to construction workers and the environment. As environmental protection requirements become increasingly important, water-based paints have emerged and developed. Water-based paints use water as a dispersion medium, which greatly reduces the volatile organic compound (VOC) content, reducing harm to construction workers and environmental pollution.

[0005] During the assembly of residential containers, silicone adhesive is used for sealing and bonding. However, when applying general water-based paint on the substrate with silicone adhesive, shrinkage will occur due to surface tension problems. In addition, the painting of residential containers is generally carried out outdoors, and the curing time is short. In rainy days, the coating is prone to bubbling, swelling, peeling, and loss of gloss.

[0006] Therefore, in order to solve these problems, a water-based protective decorative coating for living containers was developed. Summary of the invention

[0007] In order to solve the defects and shortcomings of the prior art, the purpose of the present invention is to provide a water-based protective decorative coating for a residential container and a preparation method thereof.

[0008] To achieve the above object, the technical solution adopted by the present invention is: it is made of the following raw materials in parts by weight:

[0009]

[0010]

[0011] Preferably, the waterborne alkyd resin is at least one of Run Chang Nan Xing RHERI 5406, Chengdu Bogao Synthesis RA 1861-75, Chengdu Bogao Synthesis RA 1863-75, and Chengdu Bogao Synthesis RA1820-72.

[0012] Preferably, the modifier of the waterborne alkyd resin is IPDI, that is, isophorone diisocyanate, and the chemical formula is C 12 H 18 N2O 2。

[0013] Preferably, the waterborne acrylic emulsion is at least one of Badfu 3612, Huiyu Chemical HY-401, and Landberg MT-199.

[0014] Preferably, the titanium dioxide is Longmang R996, rutile type.

[0015] Preferably, the barium sulfate is precipitated barium sulfate.

[0016] Preferably, the dispersant is an ammonium polycarboxylate dispersant, preferably one of Degussa TEGO760W, Shenzhu Chemical SN-1790A, and Shenzhu Chemical SN-1710.

[0017] Preferably, the defoamer is one of a waterborne non-silicone fatty acid polymer, a polyoxyethylene ether, or a modified polysiloxane, preferably Shierli New Materials 5327.

[0018] Preferably, the anti-flash rust agent is one of nitrites and sodium salts of organic acids, preferably at least one of Tongzhou New Materials HM-0828 and Tongzhou New Materials HM-0890.

[0019] Preferably, the substrate wetting agent is a polyether-modified polysiloxane, preferably at least one of Matsuo China MH-4107, Shenzhu Chemical SN-4741, and Shenzhu Chemical SN-4727A.

[0020] Preferably, the drier is a combination of cobalt isooctanoate and manganese isooctanoate, preferably at least one of Shanghai Mingshen Dri 1801 and Shanghai Mingshen Dri 1802.

[0021] Preferably, the pH regulator is at least one of dimethylethanolamine, AMP95, and triethylamine.

[0022] Preferably, the thickener is a polyurethane thickener, preferably the polyurethane thickener UT-1151 of Matsuo China.

[0023] A preparation method of a waterborne residential container protective and decorative coating, characterized by comprising the following steps:

[0024] 1. First, mix a small amount of water and a drier evenly in advance, then mix them with a dispersant, an antifoaming agent, and a part of water at high speed until evenly mixed. Then add titanium dioxide and barium sulfate and mix evenly, and grind until the fineness is less than 40 μm to obtain a slurry.

[0025] 2. Under nitrogen protection, add the waterborne alkyd resin to the reaction kettle, heat up to 60 °C, start stirring, and dropwise add IPDI from the constant pressure funnel, which is added up in 1 h, and keep the temperature for 1 h; then heat up to 80 °C and keep the temperature for 4 h; take a sample to measure the NCO content, and after the content meets the standard, cool down to 60 °C, add triethylamine for neutralization, and continue to disperse for 30 min to obtain the IPDI-modified waterborne alkyd resin.

[0026] 3. Mix the slurry, the IPDI-modified waterborne alkyd resin, and the waterborne acrylic emulsion evenly at a low speed, then add a pH regulator, a rust inhibitor, a substrate wetting agent, and the remaining water and stir evenly. Finally, add a thickener to adjust the viscosity to obtain the waterborne protective and decorative coating for residential containers.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. For the waterborne protective and decorative coating for residential containers of the present invention, by using IPDI polyurethane to modify the waterborne alkyd resin and mutually modifying it with the waterborne acrylic emulsion, and cooperating with a certain amount of substrate wetting agent, a protective and decorative coating for residential containers with excellent oil shrinkage resistance, good initial water resistance, high gloss and high fullness is prepared. This coating has a decorative effect of high gloss and high fullness, and is a waterborne system, which is safe, environmentally friendly, has a low VOC content, and can adopt common construction processes such as spraying, brushing, and roller coating, and generates less solid waste.

[0029] 2. In the coating system, mutual modification between the waterborne alkyd resin and the waterborne acrylic emulsion is introduced, which has excellent initial water resistance. It does not blister after being dried for 2 h and soaked in water for 168 h, and the water loss gloss rate is only 10% after being dried for 2 h and soaked in water for 1 day, etc.

[0030] 3. It can form a good coverage on substrates such as silicone glue and oil stains that are prone to form shrinkage pores.

[0031] 4. By using IPDI to modify the waterborne alkyd resin and taking advantage of the good bonding performance of IPDI polyurethane, good adhesion can be formed on various plates such as color-coated plates, galvanized plates, and channel steels, and it has good adhesion. Specific embodiments

[0032] To make the objectives, technical solutions, and advantages of the present invention more clear and understandable, the present invention will be described below through specific embodiments shown. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0033] Here, it should also be noted that in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown, while other details less related to the present invention are omitted.

[0034] An aqueous living container protective and decorative coating is made from the following raw materials in parts by weight:

[0035]

[0036]

[0037] Among them, the dispersant is an ammonium polycarboxylate dispersant, preferably one of Degussa TEGO 760W, Shenzhu Chemical SN-1790A, and Shenzhu Chemical SN-1710; the defoamer is an aqueous non-silicone fatty acid polymer, polyoxyethylene ether, or modified polysiloxane, preferably Shierli New Materials 5327; the anti-flash rust agent is one of nitrites and sodium salts of organic acids, preferably at least one of Tongzhou New Materials HM-0828 and Tongzhou New Materials HM-0890; the substrate wetting agent is a polyether-modified polysiloxane, preferably at least one of Matsuo China MH-4107, Shenzhu Chemical SN-4741, and Shenzhu Chemical SN-4727A; the drier is a combination of cobalt isooctanoate and manganese isooctanoate, preferably at least one of Shanghai Mingshen Dri 1801 and Shanghai Mingshen Dri 1802; the pH regulator is at least one of dimethylethanolamine, AMP95, and triethylamine; the thickener is a polyurethane thickener, preferably Matsuo China polyurethane thickener UT-1151.

[0038] In addition, the aqueous alkyd resin is preferably at least one of Runchang Nanxing RHERI 5406, Chengdu Bogao Synthesis RA 1861-75, Chengdu Bogao Synthesis RA 1863-75, and Chengdu Bogao Synthesis RA 1820-72; IPDI is isophorone diisocyanate, and its chemical formula is C 12 H 18 N2O 2； The aqueous acrylic emulsion is preferably at least one of Badfu 3612, Huiyu Chemical HY-401, and Landberg MT-199; the titanium dioxide is preferably Longmang R996, rutile type; the barium sulfate is precipitated barium sulfate.

[0039] A preparation method of a water-based living container protective and decorative coating, characterized in that it comprises the following steps:

[0040] First: First, mix a small amount of water and a drier evenly in advance, then mix them with a dispersant, an antifoaming agent and a part of water at high speed until evenly mixed. Then add titanium dioxide and barium sulfate and mix evenly, and then grind to a fineness of less than 40 μm to obtain a slurry.

[0041] Second: Under nitrogen protection, add the water-based alkyd resin to the reaction kettle, heat up to 60 °C, start stirring, and dropwise add IPDI from the constant pressure funnel, and finish adding it in 1 h, and keep the temperature for 1 h; then heat up to 80 °C and keep the temperature for 4 h; take a sample to measure the NCO content, and when the content meets the standard, cool down to 60 °C, add triethylamine for neutralization, and continue to disperse for 30 min to obtain an IPDI-modified water-based alkyd resin.

[0042] Third: Mix the slurry, the IPDI-modified water-based alkyd resin and the water-based acrylic emulsion evenly at low speed, then add a pH regulator, a rust inhibitor, a substrate wetting agent and the remaining water and stir evenly. Finally, add a thickener to adjust the viscosity to obtain a water-based living container protective and decorative coating.

[0043] Example 1:

[0044] A water-based living container protective and decorative coating has the following composition as shown in the following table:

[0045] Table 1 Water-based living container protective and decorative coating

[0046]

[0047]

[0048] The above preparation method of the water-based living container protective and decorative coating comprises the following steps:

[0049] First: First, add Dri 1801 and a small amount of water to the mixer, adjust the rotation speed of the mixer to 1200 r / min, stir for 2 min, and then add 5327, the dispersant and stir for 3 min, then add titanium dioxide and precipitated barium sulfate and stir for 20 min, and grind with sand to a fineness of less than 40 μm to obtain a slurry.

[0050] Second: Under nitrogen protection, add 30 parts of the water-based alkyd resin RHERI 5406 to the reaction kettle, heat up to 60 °C, start stirring, and dropwise add 7.5 parts of IPDI from the constant pressure funnel, and finish adding it in 1 h, and keep the temperature for 1 h; then heat up to 80 °C and keep the temperature for 4 h; take a sample to measure the NCO content, and when the content meets the standard, cool down to 60 °C, add triethylamine for neutralization, and continue to disperse for 30 min to obtain an IPDI-modified water-based alkyd resin.

[0051] III: Add the slurry, IPDI-modified waterborne alkyd resin, 3612, and dimethylethanolamine into a blender, adjust the blender speed to 750 r / min. Stir for 5 min. After stirring evenly, add HM-0828, SN-4741, and the remaining water and stir for 5 min. Finally, add UT-1151 to adjust the viscosity. Obtain the waterborne protective and decorative coating for residential containers.

[0052] Example 2:

[0053] Table 2 Waterborne Protective and Decorative Coating for Residential Containers

[0054]

[0055]

[0056] I: First, add Dri 1801 and a small amount of water into a blender, adjust the blender speed to 1200 r / min, stir for 2 min, and then add 5327, the dispersant and stir for another 3 min. Then add titanium dioxide and precipitated barium sulfate and stir for 20 min. Grind until the fineness is less than 40 μm to obtain the slurry;

[0057] II: Under nitrogen protection, add 25 parts of waterborne alkyd resin RHERI 5406 into a reaction kettle, heat up to 60 °C, start stirring, and dropwise add 6.25 parts of IPDI from a constant pressure funnel within 1 h. Keep warm for 1 h; then heat up to 80 °C and keep warm for 4 h; take a sample to measure the NCO content. After the content meets the standard, cool down to 60 °C, add triethylamine for neutralization, and continue to disperse for 30 min to obtain the IPDI-modified waterborne alkyd resin;

[0058] III: Add the slurry, IPDI-modified waterborne alkyd resin, 3612, and dimethylethanolamine into a blender, adjust the blender speed to 750 r / min. Stir for 5 min. After stirring evenly, add HM-0828, SN-4741, and the remaining water and stir for 5 min. Finally, add UT-1151 to adjust the viscosity. Obtain the waterborne protective and decorative coating for residential containers.

[0059] Compared with Example 1, the difference is that the resin dosage is changed, and the drier is also adjusted accordingly with the change of the resin dosage.

[0060] Example 3

[0061] Table 3 Waterborne Protective and Decorative Coating for Residential Containers

[0062]

[0063] 1. First, add Dri 1802 and a small amount of water to a blender. Adjust the blender's rotation speed to 1200 r / min and stir for 2 minutes. Then add 5327, the dispersant, and stir for another 3 minutes. Then add titanium dioxide and precipitated barium sulfate and stir for 20 minutes. Grind until the fineness is less than 40 μm to obtain a slurry;

[0064] 2. Under nitrogen protection, add 25 parts of waterborne alkyd resin RHERI 5406 to a reaction kettle, heat up to 60 °C, start stirring, and dropwise add 6.25 parts of IPDI from a constant pressure funnel over 1 hour. Keep warm for 1 hour; then heat up to 80 °C and keep warm for 4 hours; take a sample to measure the NCO content. After the content meets the standard, cool down to 60 °C, add triethylamine for neutralization, and continue to disperse for 30 minutes to obtain IPDI-modified waterborne alkyd resin;

[0065] 3. Add the slurry, IPDI-modified waterborne alkyd resin, MT-199, and dimethylethanolamine to a blender. Adjust the blender's rotation speed to 750 r / min. Stir for 5 minutes. After stirring evenly, add HM-0828, SN-4741, and the remaining water and stir for 5 minutes. Finally, add UT-1151 to adjust the viscosity. Obtain a waterborne protective and decorative coating for residential containers.

[0066] Compared with Example 2, the difference is that the waterborne acrylic emulsion is replaced with MT199, and the drier is replaced with Dri 1802 with better drying performance to accelerate the drying speed.

[0067] Example 4

[0068] Table 4 Waterborne Protective and Decorative Coating for Residential Containers

[0069]

[0070]

[0071] 1. First, add Dri 1802 and a small amount of water to a blender. Adjust the blender's rotation speed to 1200 r / min and stir for 2 minutes. Then add 5327, the dispersant, and stir for another 3 minutes. Then add titanium dioxide and precipitated barium sulfate and stir for 20 minutes. Grind until the fineness is less than 40 μm to obtain a slurry;

[0072] 2. Under nitrogen protection, add 25 parts of waterborne alkyd resin RA 1861-75 to a reaction kettle, heat up to 60 °C, start stirring, and dropwise add 6.25 parts of IPDI from a constant pressure funnel over 1 hour. Keep warm for 1 hour; then heat up to 80 °C and keep warm for 4 hours; take a sample to measure the NCO content. After the content meets the standard, cool down to 60 °C, add triethylamine for neutralization, and continue to disperse for 30 minutes to obtain IPDI-modified waterborne alkyd resin;

[0073] III: Add the slurry, IPDI-modified waterborne alkyd resin, MT-199 and dimethylethanolamine into a blender, and adjust the rotation speed of the blender to 750 r / min. Stir for 5 min. After stirring evenly, add HM-0828, MH-4107 and the remaining water and stir for 5 min. Finally, add UT-1151 to adjust the viscosity. Obtain the waterborne protective and decorative coating for residential containers.

[0074] Compared with Example 3, the difference is that the waterborne alkyd resin is replaced with RA 1861-75, the substrate wetting agent is replaced with MH-4107, the caulking property of MT-4107 is slightly better than that of SN-4741, and the amount to be added can be slightly less.

[0075] Performance test:

[0076] Perform performance tests on Examples 1-4 and compare them with waterborne container coatings on the market. The test results are as follows in the table:

[0077] Table 5 Comprehensive performance determination of special coatings

[0078]

[0079]

[0080] Note:

[0081] Glossiness: Determination of paints and varnishes in accordance with GB / T 9271-2008

[0082] Impact resistance: Determination of impact resistance of paint films in accordance with GB / T1732-1993

[0083] Water resistance: Determination of water resistance of paint films in accordance with GB / T1733-1993

[0084] Cross-cut test: Determination of cross-cut test in accordance with GB / T9286-1998

[0085] Artificial accelerated aging resistance: Conducted in accordance with the provisions of Cycle A in Method 1 of GB / T1865-2009, and the result evaluation is carried out in accordance with the provisions of GB / T1766-2008

[0086] As can be seen from Table 5, when comparing Examples 1-4, the protective and decorative coating for residential containers prepared by the present invention has excellent initial water resistance, less water loss and gloss, and good anti-oil shrinkage performance.

[0087] The protective and decorative coating for residential containers of the present invention is a special coating product, mainly aiming at the protective and decorative coating used on the substrates of residential containers. The preparation process of the present invention is simple, and the appearance, physical properties, water resistance, glue covering performance and adhesion performance on its substrates can all meet the performance requirements.

[0088] A waterborne protective and decorative coating for residential containers of the present invention uses IPDI to modify waterborne alkyd resin and mutually modify with waterborne acrylic emulsion, and cooperates with a certain amount of substrate wetting agent to prepare a protective and decorative coating for residential containers that integrates excellent anti-oil shrinkage performance, good initial water resistance performance and a coating with high gloss and high fullness. It can solve the problems of shrinkage holes formed by silicone glue used on residential containers and the problem that the paint film is easily affected when placed outdoors after construction on rainy days. It has excellent properties such as being able to form good coverage on silicone glue without shrinkage holes, being able to withstand water for 168 hours without blistering after air drying at room temperature for 2 hours, and having a light loss rate of only 10% after air drying at room temperature for 2 hours and withstanding water for 1 day. It can effectively solve the problems such as paint film blistering, swelling, peeling and light loss caused by insufficient drying time after construction and then being exposed to rainy and humid weather outdoors. By using the good adhesion of IPDI to modify waterborne alkyd resin, the prepared waterborne protective and decorative coating for residential containers can form good adhesion on galvanized sheets, color-coated plates and channel steels, has a paint film effect with high gloss and high fullness, has a good decorative and aesthetic effect when covering the substrate, and has good weather resistance and light and color retention properties.

[0089] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0090] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An aqueous living container protective and decorative coating is made of the following raw materials in parts by weight:

2. The aqueous living container protective and decorative coating according to claim 1, characterized in that: The waterborne alkyd resin is a short-oil alkyd resin.

3. The aqueous living container protective and decorative coating according to claim 1, characterized in that: The waterborne acrylic emulsion is a styrene-acrylic emulsion obtained by emulsion polymerization of acrylic acid, butadiene, and styrene.

4. The aqueous living container protective and decorative coating according to claim 1, characterized in that: The IPDI is isophorone diisocyanate, and its chemical formula is C 12 H 18 N2O2.

5. The aqueous living container protective and decorative coating according to claim 1, characterized in that: The dispersant is an ammonium polycarboxylate dispersant.

6. The aqueous living container protective and decorative coating according to claim 1, characterized in that: The defoamer is a waterborne non-silicone fatty acid polymer, a polyoxyethylene ether, or a modified polysiloxane.

7. The aqueous living container protective and decorative coating according to claim 1, characterized in that: The anti-flooding and anti-rust agent is one of nitrites and sodium salts of organic acids.

8. The aqueous living container protective and decorative coating according to claim 1, characterized in that: The substrate wetting agent is a polyether-modified polysiloxane; the drier is a combination of cobalt isooctanoate and manganese isooctanoate.

9. The aqueous living container protective and decorative coating according to claim 1, characterized in that: The pH regulator is at least one of dimethylethanolamine, AMP95, and triethylamine; the thickener is a polyurethane thickener.

10. A preparation method of the aqueous living container protective and decorative coating, characterized in that: It includes the following steps: One: First, mix a small amount of water and the drier evenly in advance, then mix them with the dispersant, defoamer, and a part of water at high speed until evenly mixed. Then add titanium dioxide and barium sulfate and mix evenly, and grind until the fineness is less than 40 μm to obtain a slurry. Two: Under nitrogen protection, add the waterborne alkyd resin to the reaction kettle, heat up to 60 °C, start stirring, and dropwise add IPDI from the constant pressure funnel. Finish adding it in 1 h and keep the temperature for 1 h. Then heat up to 80 °C and keep the temperature for 4 h. Take a sample to measure the NCO content. After the content meets the standard, cool down to 60 °C, add triethylamine for neutralization, and continue to disperse for 30 min to obtain the IPDI-modified waterborne alkyd resin. Three: Mix the slurry, the IPDI-modified waterborne alkyd resin, and the waterborne acrylic emulsion evenly at low speed, then add the pH regulator, rust inhibitor, substrate wetting agent, and the remaining water and stir evenly. Finally, add the thickener to adjust the viscosity to obtain the waterborne protective and decorative coating for residential containers.

Images