Water-based single-component decorative coating for foaming material as well as production method and application of water-based single-component decorative coating

Abstract

The invention provides a water-based single-component decorative coating for a foaming material and a production method and application thereof, and the water-based single-component decorative coating comprises the following raw material components in parts by weight: 75-90 parts of acrylic synthetic emulsion, 5-15 parts of polyurethane emulsion, 1-3 parts of purified water, 1-5 parts of an anti-sticking aid, 1-2 parts of color paste and 1.4-5.5 parts of other aids. The acrylic emulsion and the polyurethane emulsion have a slight cross-linking reaction through compounding, a small amount of-OH groups in the acrylic emulsion react with-NCO groups in the polyurethane emulsion to generate carbamate groups, the carbamate groups have good cohesiveness, pressing strength and rebound resilience, the molecular weight is increased after cross-linking, and the adhesive force of the polyurethane emulsion is increased. The comprehensive performance is further improved, so that the pressing strength, the elastic recovery, the flexibility and the like can be greatly improved.

Description

Technical Field

[0001] The invention relates to the field of decorative coatings for foaming materials, and in particular to a water-based single-component decorative coating for foaming materials, and a production method and application thereof. Background Art

[0002] Traditional decorative coatings for foam materials mainly use two-component acrylic polyurethane decorative coatings, which have good adhesion with various foam materials, bright coatings, good resilience and good anti-adhesion properties. However, in the production process, it is inevitable to use a large amount of organic solvents, and a large amount of volatile organic solvents will be released during the production process. Organic solvents are flammable, explosive, toxic and harmful substances. The safety and health of workers are not guaranteed, which wastes resources and pollutes the environment, and has a great impact on human health and the environment. The emission limit of volatile organic compounds (VOCs) is stipulated in the United States. In addition to the United States, other European countries have also taken measures to limit the emission concentration of VOCs. With the strengthening of environmental protection, the restrictions on VOCs are more stringent. Because the acrylic polyurethane solvent-based coating used in the decorative coatings for traditional foam materials is a two-component coating, it needs to be configured in proportion before use, and the configured coating must be used up within the specified time, otherwise it will solidify and easily cause waste. Generally speaking, the coating is applied by spraying or dipping on the assembly line in the workshop. The subsequent drying step is to form a film by low-temperature baking on a drying oven at 50-70°C. Therefore, a large amount of organic solvents will be volatilized and released during the spraying or dipping construction process and the baking and drying process, which will not only cause great harm to the health of the construction workers, but also pose great safety hazards such as combustion and explosion. As the environmental protection regulations of various countries have higher and higher requirements for organic volatiles, the use of solvent-based paints will be greatly restricted, and only water-based environmentally friendly coatings can meet environmental protection requirements. Therefore, after research and improvement, some European and American countries have introduced the so-called "green" water-based coatings and resins. This type of water-based coating does not use or only uses a small amount of organic solvents, which fundamentally eliminates or reduces environmental pollution problems.

[0003] In the prior art, for example, Chinese patent CN104817946A discloses a one-component water-based wood coating, which has good wear resistance and high coating hardness, but is only applicable to wood surfaces. When used as a coating in the field of foam material decoration, it is also necessary to adapt to the deformation of the foam material, requiring the coating to be soft and have a certain resilience. In addition, due to molds and foaming processes, it is impossible to ensure that the foaming holes on the surface of the foam material are the same size, so the coating needs to have good filling properties to cover the holes, and the coating needs to have good elasticity to adapt to the deformation of the foam material. High-hardness wood coatings cannot meet the coating requirements of the surface of decorative foam materials. At present, there is no report on the use of water-based one-component coatings in the field of foam materials and decorative foam materials. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology and provide a water-based one-component decorative coating suitable for foaming materials, which is safe and environmentally friendly, has a certain resilience, good pressing strength, flexibility, and good anti-stickiness.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is: A water-based single-component decorative coating for foaming materials comprises the following raw material components by weight: 75-90 parts of acrylic synthetic emulsion, 5-15 parts of polyurethane emulsion, 1-3 parts of pure water and 1-5 parts of anti-adhesion auxiliary agent.

[0006] Preferably, the acrylic synthetic emulsion is a combination of one or more of pure acrylic synthetic emulsion, styrene acrylic synthetic emulsion, and silicone acrylic synthetic emulsion. The acrylic synthetic emulsion has a glass transition temperature of 20-35° C. and a solid content of 45-50%.

[0007] In the present invention, the glass transition temperature and solid content of the acrylic synthetic emulsion are controlled within the above ranges because the glass transition temperature of the emulsion directly affects the hardness and resilience of the final coating film, and the solid content affects the overall unit thickness and gloss of the coating film. If the hardness and resilience of the coating film are not within the above ranges, they will not reach the optimal state.

[0008] Preferably, the polyurethane emulsion comprises an aliphatic polyester polyether mixture synthetic emulsion, the tensile strength at break of the polyurethane emulsion is greater than 50MPa, the elongation at break is greater than 500%, and the solid content is 30-40%. The aliphatic polyether polyurethane emulsion selected in the present invention has excellent yellowing resistance and hydrolysis resistance. Controlling the tensile strength at break, elongation at break and solid content of the polyurethane emulsion within the above range is conducive to maintaining the optimal resilience, compression strength and anti-sticking properties of the water-based single-component decorative coating.

[0009] Preferably, the anti-sticking agent includes one or a combination of water-based polyethylene wax emulsion and water-based polypropylene wax emulsion. The water-based polyethylene wax emulsion and / or water-based polypropylene wax emulsion are non-ionic systems, and using them as anti-sticking agents can have good compatibility with film-forming substances, so that the finished coating has good anti-sticking properties.

[0010] Preferably, the water-based single-component decorative paint further comprises 1 to 2 parts of color paste, and the color paste is a water-based super-dispersed color paste.

[0011] Preferably, in parts by weight, the other additives include 0.2 to 0.5 parts of thickener, 1.0 to 4.0 parts of film-forming aid, 0.1 to 0.3 parts of preservative, and 0.1 to 0.3 parts of defoaming agent.

[0012] Preferably, the thickener comprises a polyurethane associative thickener, an acrylic associative thickener, or a combination of both, and the film-forming aid comprises alcohol ester dodecahydrate.

[0013] Preferably, the preservative includes one or a combination of two of Kathon-type and BIT-type preservatives, and the defoaming agent includes one or a combination of two of mineral oil and silicone defoaming agents.

[0014] Preferably, the following raw material components are included in parts by weight: 86 parts of acrylic synthetic emulsion, 7 parts of polyurethane emulsion, 0.1 parts of defoaming agent, 0.2 parts of thickener, 2.0 parts of film-forming aid, 0.2 parts of preservative, 1.0 parts of purified water, 2.5 parts of anti-sticking agent, and 1.0 parts of color paste.

[0015] Preferably, the water-based one-component decorative paint has a resilience of ≥95%, a glossiness of >90 at 60°, an adhesion of <1 level, an anti-stickiness and heat resistance of no sticking at 60°C, a compression strength of ≥0.5MPa, and can be bent 100 times without breaking or wrinkling.

[0016] Based on the overall inventive concept, the present invention also provides a method for producing a water-based one-component decorative coating for foaming materials, wherein acrylic synthetic emulsion, polyurethane emulsion, other additives, purified water, anti-sticking additive, and color paste are added in sequence while maintaining stirring, and the water-based one-component decorative coating for foaming materials is obtained by mixing evenly.

[0017] Based on the overall inventive concept, the present invention also provides an application of a water-based one-component decorative coating for foaming materials in the field of decorative foaming materials, wherein the foaming material is a soft foaming material selected from one of PVC, polyurethane or PE.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses acrylic ester synthetic emulsion and polyurethane emulsion to compound as film-forming substances. Through compounding, a slight cross-linking reaction will occur between the two, that is, a small amount of -OH groups in the acrylic emulsion react with -NCO groups in the polyurethane emulsion to generate carbamate groups. The generation of this group can make the coating film have good adhesion, compression strength and resilience, and the molecular weight will increase after cross-linking, and the comprehensive performance of the coating film will be further improved, that is, the compression strength, elastic recovery and flexibility and other indicators are all improved. Its medium is water, and no organic solvent is used. Therefore, it has great advantages in environmental protection, construction safety and price. At the same time, it has low production cost, simple construction and energy saving. It is a good choice for decorative coatings to replace traditional solvent-based foaming materials.

[0019] (2) The present invention uses water-based polyethylene and polypropylene wax emulsions as anti-sticking aids. The wax emulsions are non-ionic and therefore have good compatibility with acrylic and polyurethane emulsions, so that the finished coating film has good anti-sticking properties. Color paste is added, and the color can be selected according to customer needs, making it decorative and ornamental.

[0020] (3) The present invention is a water-based one-component self-drying paint that is ready for use right out of the bucket. It can form a film naturally at room temperature or by baking at low temperature. Compared with the solvent-based two-component decorative paint used for foaming materials in the prior art, it does not require the addition of a curing agent on site for preparation. The construction method is the same as that of traditional solvent-based paints. It can be applied by spraying or dipping, and then baked in a drying oven to form a film. The construction method is convenient and does not require the purchase of additional equipment. In addition, no toxic or harmful substances are generated during the construction and drying process, and there is no impact on the health of construction workers and the environment. There are no safety risks such as combustion and explosion.

[0021] In summary, water-based one-component decorative coatings for foaming materials have good environmental protection, construction safety, simple construction, and cost advantages. They are a good choice to replace traditional solvent-based decorative coatings for foaming materials. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in combination with the specification and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0023] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0024] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0025] Raw materials: All raw materials used are commercially available. Acrylic emulsion is silicon-modified styrene acrylic emulsion, model HZ-912N, Hebei Haoze Chemical; polyurethane emulsion is water-based polyurethane dispersion, model PU-202C, Guangzhou Guanzhi; anti-adhesive agent is water-based polyethylene wax emulsion, model AD9203, Dongguan Aoda Environmental Protection New Materials; defoamer is mineral oil, model NXZ, Japan Nopco; preservative is BIT preservative, model 310, Shanghai Maiken.

[0026] Embodiment 1: A water-based single-component decorative coating for foaming materials, comprising the following components in parts by weight: 78 parts of acrylic synthetic emulsion, 14 parts of polyurethane emulsion, 0.1 parts of defoamer, 0.3 parts of thickener, 1.0 parts of film-forming aid, 0.2 parts of preservative, 1.0 parts of purified water, 2.5 parts of anti-sticking aid, and 1.0 parts of color paste. The glass transition temperature of the acrylic synthetic emulsion is 20-35°C, and the solid content is 45-50%. The color paste is a water-based super-dispersed color paste. The preservative is a BIT preservative, and the defoamer is a silicone defoamer.

[0027] In this embodiment, the preparation method of the water-based one-component decorative coating for the foaming material comprises the following steps: ①First, add acrylic synthetic emulsion into the production tank, start the high-speed disperser, stir at a speed of 200r / min, and then add polyurethane emulsion and stir for 5 minutes; ②Then slowly add film-forming aid and stir for 3 minutes, and increase the speed to 400r / min according to the viscosity of the material; ③Add defoamer and stir evenly, dilute the preservative with pure water and add it, and keep stirring for 3 minutes; ④Add anti-sticking agent and keep stirring for 5 minutes, ⑤Finally, add thickener, increase the speed to 500r / min, and keep stirring for 15 minutes; ⑥Add color paste and keep stirring for 5 minutes to obtain water-based single-component decorative coating for foaming material, detect, filter, and package to obtain finished products.

[0028] Embodiment 2: A water-based single-component decorative coating for foaming materials, comprising the following components in parts by weight: 86 parts of silicone-acrylic synthetic emulsion, 7 parts of polyurethane emulsion, 0.1 parts of defoamer, 0.2 parts of thickener, 2.0 parts of film-forming aid, 0.2 parts of preservative, 1.0 parts of purified water, 2.5 parts of anti-sticking aid, and 1.0 parts of color paste. The thickener is a combination of a polyurethane associative thickener and an acrylic associative thickener. The preservative is a kason-type preservative, and the defoamer is a mineral oil defoamer.

[0029] In this embodiment, the preparation method of the water-based one-component decorative coating for the foaming material comprises the following steps: ① First, add silicone-acrylic synthetic emulsion into the production tank, turn on the high-speed disperser, stir at a speed of 350r / min, and then add polyurethane emulsion and stir for 5 minutes; ② Then slowly add film-forming aid and stir for 3 minutes, and increase the speed to 450r / min according to the viscosity of the material; ③ Add defoaming agent and stir evenly, dilute the preservative with pure water and add it, and keep stirring for 3 minutes; ④ Add anti-sticking agent and keep stirring for 5 minutes, ⑤ Finally, add thickener, increase the speed to 600r / min, and keep stirring for 15 minutes; ⑥ Add color paste and keep stirring for 5 minutes to obtain a water-based single-component decorative coating for the foaming material, test, filter, and package to obtain a finished product.

[0030] Embodiment 3: A water-based single-component decorative coating for foaming materials, comprising the following components by weight: 76 parts of styrene-acrylic synthetic emulsion, which can be obtained by modifying dihydroxy tetracoordinated silicon according to a conventional method, and the content of dihydroxy tetracoordinated silicon is 2-3% by weight; 15 parts of polyurethane emulsion, which is a modified polyurethane resin aqueous dispersion, and is an aliphatic polyester polyether mixed system, and its performance indicators are: 100% modulus greater than 8MPa, breaking strength greater than 55MPa, and elongation greater than 900%. 0.2 parts of defoaming agent, 0.3 parts of thickener, 2.0 parts of film-forming agent, 0.2 parts of preservative, 1.5 parts of purified water, 4.5 parts of anti-sticking agent. The anti-sticking agent used is a non-ionic high-density aqueous polyethylene wax emulsion, and its performance indicators are: emulsion particle size D50: 200-400nm, D90: 400-800nm, solid wax melting point: 125-130℃, and color paste 1.0 parts.

[0031] In this embodiment, the styrene-acrylic synthetic emulsion can be obtained by modifying dihydroxy tetracoordinate silicon according to a conventional method, and the content of the dihydroxy tetracoordinate silicon is 2-3% by weight.

[0032] The polyurethane emulsion is a modified polyurethane resin aqueous dispersion, which is an aliphatic polyester polyether mixed system, and its performance indicators are: 100% modulus greater than 8MPa, breaking strength greater than 55MPa, and elongation greater than 900%.

[0033] The anti-sticking auxiliary agent is a non-ionic high-density water-based polyethylene wax emulsion, and its performance indicators are: emulsion particle size D50: 200-400nm, D90: 400-800nm, solid wax melting point: 125-130°C, and color paste 1.0 part.

[0034] The preservative is a combination of a Kathon preservative and a BIT preservative, the defoamer is a combination of a mineral oil defoamer and an organosilicon defoamer, the thickener is an acrylic acid associative thickener, and the film-forming aid is alcohol ester dodecahydrate.

[0035] In this embodiment, the preparation method of the water-based one-component decorative coating for the foaming material comprises the following steps: ① First, add styrene-acrylic synthetic emulsion into the production tank, start the high-speed disperser, stir at a speed of 300r / min, and then add the polyurethane emulsion and stir for 5 minutes; ② Then slowly add the film-forming agent and stir for 3 minutes, and increase the speed to 450r / min according to the viscosity of the material; ③ Add the defoamer and stir evenly, dilute the preservative with pure water and add it again, and keep stirring for 3 minutes; ④ Add the anti-sticking agent and keep stirring for 5 minutes, ⑤ Finally, add the thickener, increase the speed to 550r / min, and keep stirring for 15 minutes; ⑥ Add the color paste and keep stirring for 5 minutes to obtain a water-based single-component decorative coating for the foaming material, test, filter, and package to obtain the finished product.

[0036] Comparative Example 1: A water-based one-component decorative coating for foaming materials: no anti-sticking agent is added, the coating prepared and the performance test: The following components are included in parts by weight: 85.8 parts of pure acrylic synthetic emulsion (Tg value is 25° C.), 10 parts of polyurethane emulsion, 0.2 parts of defoamer, 0.3 parts of thickener, 2.0 parts of film-forming aid, 0.2 parts of preservative, 1.5 parts of purified water, and 1.0 parts of color paste. The preparation method is the same as that of Example 1.

[0037] Comparative Example 2: A water-based one-component decorative coating for foaming materials: a coating made of acrylic synthetic emulsion without using polyurethane emulsion and performance test: The composition comprises the following components in parts by weight: 90.3 parts of pure acrylic synthetic emulsion (Tg value is 25° C.), 0.2 parts of defoamer, 0.3 parts of thickener, 2.0 parts of film-forming aid, 0.2 parts of preservative, 1.5 parts of purified water, 4.5 parts of anti-sticking aid (aqueous polyethylene wax emulsion), and 1.0 parts of color paste. The preparation method is the same as that of Example 1.

[0038] Comparative Example 3: A water-based one-component decorative coating for foaming materials: coating made of polyurethane emulsion only without using acrylic synthetic emulsion and performance test: The composition comprises the following components in parts by weight: 91.3 parts of polyurethane emulsion, 0.2 parts of defoamer, 0.3 parts of thickener, 2.0 parts of film-forming aid, 0.2 parts of preservative, 1.5 parts of purified water, 3.5 parts of anti-sticking aid (aqueous polyethylene wax emulsion), and 1.0 parts of color paste. The preparation method is the same as that of Example 1.

[0039] Comparative Example 4 The properties of solvent-based two-component polyurethane foam decorative coatings currently available on the market.

[0040] The performance index requirements of decorative coatings suitable for foaming materials are as follows: Table 1: Performance requirements of decorative coatings for foaming materials

[0041] The embodiments and comparative examples were subjected to performance tests, and the test items and test data are shown in Table 2.

[0042] Table 2: Performance test data of the embodiments of the present invention and the comparative examples

[0043] From the above comparative test data, it can be seen that when acrylic acid synthetic emulsion, polyurethane emulsion and anti-adhesive agent are added in appropriate amounts, the gloss, adhesion, resilience, anti-adhesive heat resistance, compressive strength, low-temperature flexibility, flex resistance and VOC content of water-based single-component decorative coatings can meet the requirements. However, the performance of water-based single-component decorative coatings without using propionic acid synthetic emulsion, polyurethane emulsion or anti-adhesive agent cannot meet the requirements, mainly in terms of pressing strength, gloss, low-temperature flexibility, adhesion and anti-adhesive heat resistance.

[0044] The water-based single-component decorative coating prepared in Examples 1-3 was applied on the polyurethane foam board by spraying or dipping. After being baked at 60-80°C to form a film, the performance fully met the use requirements, and the performance basically reached the performance of the two-component solvent-based foam decorative coating currently in use, and it has more advantages in environmental protection and safety. The specific performance data are shown in Table 3: Table 3: Test data applied to polyurethane foam boards

[0045] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A water-based one-component decorative coating for foaming materials, characterized in that: The raw material components are as follows: 75-90 parts of acrylic synthetic emulsion, 5-15 parts of polyurethane emulsion, 1-3 parts of purified water and 1-5 parts of anti-sticking auxiliary agent.

2. The water-based one-component decorative paint according to claim 1, characterized in that: The acrylic synthetic emulsion is a combination of one or more of pure acrylic synthetic emulsion, styrene acrylic synthetic emulsion, and silicone acrylic synthetic emulsion. The acrylic synthetic emulsion has a glass transition temperature of 20-35° C. and a solid content of 45-50%.

3. The water-based one-component decorative paint according to claim 1, characterized in that: The polyurethane emulsion comprises a synthetic emulsion of aliphatic polyester polyether mixture, the tensile strength at break of the polyurethane emulsion is greater than 50MPa, the elongation at break is greater than 500%, and the solid content is 30-40%.

4. The water-based one-component decorative paint according to claim 1, characterized in that: The anti-sticking aid comprises one or a combination of water-based polyethylene wax emulsion and water-based polypropylene wax emulsion.

5. The water-based one-component decorative paint according to claim 1, characterized in that: The water-based single-component decorative paint also includes 1 to 2 parts of color paste, and the color paste is a water-based super-dispersed color paste.

6. The water-based one-component decorative paint according to claim 1, characterized in that: The raw material components also include other additives, which include, by weight, 0.2-0.5 parts of thickeners, 1.0-4.0 parts of film-forming aids, 0.1-0.3 parts of preservatives, and 0.1-0.3 parts of defoaming agents; the thickener includes a combination of one or more of polyurethane associative thickeners and acrylic associative thickeners, and the film-forming aid includes alcohol ester dodecahydrate; the preservative includes a combination of one or two of Kathon and BIT preservatives, and the defoaming agent includes a combination of one or two of mineral oil and silicone defoaming agents.

7. The water-based one-component decorative paint according to claim 6, characterized in that: The raw material components are calculated by weight: 86 parts of acrylic synthetic emulsion, 7 parts of polyurethane emulsion, 0.1 parts of defoaming agent, 0.2 parts of thickener, 2.0 parts of film-forming aid, 0.2 parts of preservative, 1.0 parts of purified water, 2.5 parts of anti-sticking agent and 1.0 parts of color paste.

8. The water-based one-component decorative paint according to claims 1-7, characterized in that: The water-based single-component decorative paint has a resilience of ≥95%, a 60° glossiness of >90, an adhesion of <1 level, an anti-stickiness and heat resistance of no sticking at 60°C, a pressing strength of ≥0.5MPa, and is bent 100 times without breaking or wrinkling.

9. A method for producing a water-based one-component decorative coating for foaming materials as claimed in any one of claims 1 to 7, characterized in that: While stirring, add acrylic synthetic emulsion, polyurethane emulsion, other additives, purified water, anti-sticking additive and color paste in sequence, and mix them evenly to obtain a water-based single-component decorative coating for foaming materials.

10. Use of a water-based one-component decorative coating for foaming materials according to any one of claims 1 to 8 in the field of decorative foaming materials, characterized in that: The foaming material is a soft foaming material, and the soft foaming material is selected from one of PVC, polyurethane or PE.

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