Water-based silk effect art paint and preparation method thereof

Abstract

The application discloses a kind of water-based silk effect art paint and preparation method thereof, belong to water-based paint technical field.The art paint includes: water-based film-forming emulsion, polyethylene oxide and polyvinyl alcohol;Wherein, the polyethylene oxide is water-soluble polymer with weight average molecular weight 100,000~8,000,000;The alcoholysis degree of polyvinyl alcohol is 80mol%~99.9mol%, and the polymerization degree is 300~3000;The mass ratio of polyethylene oxide and polyvinyl alcohol is 1:1~1:20.The application solves the technical defects such as viscosity drift, flocculation, heat storage instability, poor continuity of wire drawing, wire breakage, burr and the like existing in the existing polyacrylamide silk thread coating by the synergistic compounding of PEO and PVA, the obtained coating wire drawing length is >20cm, viscosity growth <15KU after 2 weeks of heat storage at 55 DEG C, and has excellent construction performance, silk thread texture is delicate and smooth, with silk-like light and shadow flowing effect.

Description

Technical Field

[0001] This invention belongs to the field of water-based coating technology, specifically relating to a water-based silk-textured artistic paint and its preparation method. Background Technology

[0002] As an upgrade direction for wall decoration materials, artistic coatings are shifting from "single color coverage" to "texture expression and spatial mood shaping." Against the backdrop of residential improvement, commercial space renovation, and increasing homogenization of high-end decoration, homeowners and designers have placed higher demands on walls: not only must they be environmentally friendly and durable, but they must also present perceptible layers and details under different lighting and viewing distances, enhancing the recognizability and sophistication of the space, thereby providing consumers with greater emotional value.

[0003] The market exhibits significant price segment differentiation: the high-end emphasizes imported / original processes and systems; the mid-range emphasizes "effect + environmental protection"; and the low-end focuses on "artistic-looking coatings" (low-cost textured paints) to capture market share. Mainstream product forms include: microcement, stucco / lime-based, metallic paint, sandstone / ceramic, velvet / skin-like, and marble-like texture systems.

[0004] Among them, the "silk texture effect" artistic coating system uses a controllable process to create a continuous, fine, and directional silk texture on the wall. This effect produces soft changes in light and shadow and a flowing metallic / silk-like appearance under natural light and side lighting. It is compatible with various styles such as modern, minimalist, and light luxury, and is suitable for visually important areas such as living room background walls, entryways, corridors, and commercial display surfaces, satisfying the aesthetic requirement of "unity from afar and detail up close".

[0005] However, there are currently few textured coating products on the market, and existing technologies mainly rely on polyacrylamide (PAM) to create the textured effect. For example, patent application CN116731581A discloses an artistic coating with a textured effect and its preparation method. This technology adds polyacrylamide to the coating to give it a textured effect, while reducing the negative impact of polyacrylamide on the coating through the synergistic effect between the additives and the components of the premixed solution, and improving the water resistance, stain resistance and anti-settling effect of the artistic coating.

[0006] However, the aforementioned existing technologies still have significant drawbacks: polyacrylamide is prone to viscosity drift, flocculation, and thermal storage instability in formulations, and the paint film has a poor feel. During application, it exhibits poor stringing continuity, is prone to breakage and burrs, and fails to meet the requirements of high-quality textured artistic coatings. Furthermore, polyacrylamide is shear-sensitive, and its performance degrades rapidly during application, limiting its application in professional artistic coating fields.

[0007] Therefore, there is an urgent need to develop a new type of water-based silk-textured artistic coating that is environmentally friendly, stable, easy to apply, and has excellent silk-texturing effect, in order to solve the above-mentioned problems in the existing technology. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a water-based silk-textured artistic paint and its preparation method. This invention introduces polyethylene oxide (PEO) and polyvinyl alcohol (PVA) as synergistic silk-texturing functional materials to construct a novel silk-texturing system, fundamentally solving the technical defects of existing polyacrylamide-based silk-textured coatings, such as viscosity drift, flocculation, unstable thermal storage, poor silk-texturing continuity, broken fibers, and burrs.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: The first objective of this invention is: A water-based silk-textured artistic paint is provided, comprising: a water-based film-forming emulsion, polyethylene oxide, and polyvinyl alcohol; in, The polyethylene oxide is a water-soluble polymer with a weight average molecular weight of 100,000 to 8,000,000. The degree of alcoholysis of the polyvinyl alcohol is 80 mol% to 99.9 mol%, and the degree of polymerization is 300 to 3000. The mass ratio of polyethylene oxide to polyvinyl alcohol is 1:1 to 1:20, and the two are used together as a filament-drawing functional material.

[0010] The water-based silk-textured artistic paint of the present invention is further optimized as follows: The raw material components include the following percentages by mass: Water 15%–45%, aqueous film-forming emulsion 10%–45%, polyethylene oxide 0.03%–3.00%, polyvinyl alcohol 0.10%–8.00%, pigment 0%–25%, filler 4%–50%, dispersant 0.10%–1.50%, wetting agent 0.05%–1.00%, defoamer 0.05%–1.00%, preservative and mildew inhibitor 0.05%–1.00%, pH adjuster 0.05%–1.00%, film-forming aid 0%–5.00%, thickening and rheology modifier 0.05%–3.00%, other functional additives 0%–5.00%, the sum of all components is 100%.

[0011] The water-based silk-textured artistic paint of the present invention is further optimized as follows: The polyethylene oxide has a weight-average molecular weight of 500,000 to 5,000,000, and is added at a rate of 0.05% to 2.00% of the total mass of the coating. The polyvinyl alcohol has a degree of alcoholysis of 87 mol% to 99 mol% and a degree of polymerization of 500 to 2400, and is added at a rate of 0.20% to 6.00% of the total mass of the coating.

[0012] The water-based silk-textured artistic paint of the present invention is further optimized as follows: The polyethylene oxide has a weight-average molecular weight of 1,000,000 to 4,000,000, and is added at a rate of 0.10% to 1.20% of the total mass of the coating. The polyvinyl alcohol has a degree of alcoholysis of 88 mol% to 98 mol% and a degree of polymerization of 800 to 2000, and is added at a rate of 0.50% to 4.00% of the total mass of the coating.

[0013] The water-based silk-textured artistic paint of the present invention is further optimized as follows: The mass ratio of polyethylene oxide to polyvinyl alcohol is 1:2 to 1:12.

[0014] The water-based silk-textured artistic paint of the present invention is further optimized as follows: The mass ratio of polyethylene oxide to polyvinyl alcohol is 1:3 to 1:8.

[0015] The water-based silk-textured artistic paint of the present invention is further optimized as follows: The aqueous film-forming emulsion is selected from one or more of the following: pure acrylic emulsion, styrene-acrylic emulsion, silicone-acrylic emulsion, vinyl acetate-acrylic emulsion, polyurethane dispersion, acrylic-polyurethane composite emulsion, and self-crosslinking acrylic emulsion, and its glass transition temperature Tg is -20℃ to 50℃.

[0016] For interior wall art coatings, emulsions with a Tg of -10℃ to 30℃ are preferred; For exterior wall art coatings, pure acrylic, silicone acrylic, or self-crosslinking acrylic emulsions with better weather resistance are preferred.

[0017] The water-based silk-textured artistic paint of the present invention is further optimized as follows: The pigments include one or more of titanium dioxide, iron oxide pigments, carbon black, phthalocyanine pigments, pearlescent pigments, metallic effect pigments, and mica titanium pearlescent powder; to obtain better brushed and silk-like decorative effects, it is preferable to add flake fillers or pearlescent pigments, such as mica powder, sericite, pearlescent powder, etc.; wherein the amount of flake fillers or pearlescent pigments added is preferably 5% to 50% of the total mass of the fillers; The filler includes one or more of the following: calcium carbonate, sand flour, talc powder, kaolin, wollastonite powder, barite powder, mica powder, quartz powder, bentonite, and diatomaceous earth.

[0018] The water-based silk-textured artistic paint of the present invention is further optimized as follows: The thickening rheology modifier is selected from one or more of the following: hydroxyethyl cellulose, hydroxypropyl methyl cellulose, alkali-swellable acrylic thickener, polyurethane associative thickener, bentonite, magnesium aluminum silicate, and xanthan gum; The thickening rheology modifier is used to adjust the low shear viscosity and anti-sagging properties of the coating, but it does not replace the fiber-drawing function of polyethylene oxide (PEO) and polyvinyl alcohol (PVA).

[0019] The water-based silk-textured artistic paint of the present invention is further optimized as follows: The other functional additives are selected from one or more of the following: antifreeze, hand feel agent, leveling agent, and exterior wall light stabilizer.

[0020] The second objective of this invention is: A method for preparing the aforementioned water-based silk-textured artistic paint is provided, comprising the following steps: Step S1: Prepare a polyvinyl alcohol aqueous solution: Add some water to the reaction vessel, start stirring, slowly add polyvinyl alcohol powder, heat to 80℃~95℃, keep warm and stir for 30~120 minutes to completely dissolve the polyvinyl alcohol, and obtain a polyvinyl alcohol aqueous solution after cooling. Step S2: Prepare an aqueous solution of polyethylene oxide: Add another portion of water to a dispersion container, and slowly sprinkle in polyethylene oxide powder under medium-low speed stirring conditions. Stir for 30 to 180 minutes, and if necessary, let it stand for 2 to 24 hours to mature, to obtain a polyethylene oxide aqueous solution. Step S3: Preparation of PEO / PVA composite drawing solution: The polyvinyl alcohol aqueous solution obtained in step S1 is cooled to 20℃~50℃, and the polyethylene oxide aqueous solution obtained in step S2 is added under low-speed stirring. The mixture is stirred evenly to obtain PEO / PVA composite drawing liquid. Step S4: Preparation of basic coating slurry: Add the remaining water, dispersant, wetting agent, part of the defoamer, pH adjuster, cellulose thickener and other functional additives from the thickening rheology aid to the dispersion tank, stir evenly, then add pigments and fillers, and disperse at high speed to a fineness ≤80μm to obtain the basic coating slurry; Step S5: Paint Mixing: Under medium-low speed stirring, add water-based film-forming emulsion, film-forming aid, thickening rheology modifiers other than cellulose thickeners, preservatives and mildew inhibitors, remaining defoamers and other remaining functional additives to the base coating slurry. Each additive is added at intervals. After stirring evenly, add the PEO / PVA composite drawing liquid obtained in step S3, stir evenly at low speed, adjust the pH to 7.0-10.0, adjust the viscosity, filter and package to obtain the water-based silk texture effect art paint.

[0021] The preparation method of the water-based silk-textured artistic paint of the present invention is further optimized as follows: The stirring speed in step S2 is 200-800 rpm; In step S3, the stirring speed is 100-600 rpm, and high shear dispersion is avoided to prevent the polyethylene oxide molecular chains from breaking; in step S4, the high-speed dispersion speed is 800-2000 rpm, and the dispersion time is 15-60 minutes.

[0022] The preparation method of the water-based silk-textured artistic paint of the present invention is further optimized as follows: The final Stormer viscosity of the water-based silk-textured artistic paint is 80–140 KU, and the Brookfield viscosity is 5,000–80,000 mPa·s.

[0023] The preparation method of the water-based silk-textured artistic paint of the present invention is further optimized as follows: The solid content of the polyvinyl alcohol aqueous solution is 5% to 20%; The solid content of the polyethylene oxide aqueous solution is 0.5% to 5%.

[0024] Compared with the prior art, the present invention has the following technical features and effects: (1) Through the synergistic effect of PEO and PVA, the drawing length of the coating of the present invention can reach more than 20cm (up to 25cm), which is far superior to the level of less than 15cm of commercially available products. Moreover, the silk is continuous and smooth, without broken silk or burrs, and the drawing performance is significantly improved.

[0025] (2) After the coating of the present invention is stored at 55°C for 2 weeks, the viscosity increases by <15KU, while the viscosity of commercially available PAM products increases by >20KU. This effectively solves the problems of viscosity drift and flocculation, and has excellent storage stability.

[0026] (3) PEO provides excellent stretching and lubricity, while PVA provides film-forming and texture retention. Together, they enable the coating to have a suitable application open time and good texture retention, resulting in a smooth application feel, controllable texture direction, and excellent application performance.

[0027] (4) The introduction of PVA enhances the strength, toughness and scrub resistance of the dry film, while improving the feel of the paint film and avoiding the problem of rough feel of the PAM system paint film, thus improving the quality of the paint film.

[0028] (5) Both PEO and PVA are water-soluble polymers, non-toxic and harmless. When combined with water-based emulsion systems, they have low VOC content, which meets the environmental protection requirements of green building and interior decoration. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and comparative experiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Unless otherwise specified, the reagents, equipment, and methods used in this invention are conventional reagents, equipment, and general methods in this technical field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products; conventional auxiliaries whose dosages are not specified are within the appropriate ranges commonly used in this technical field.

[0030] Example 1: A water-based silk-textured artistic paint The sources of raw materials are shown in Table 1.

[0031] Table 1. Raw materials and their sources used in the examples

[0032] The formulation of the water-based silk texture effect art paint is shown in Table 2.

[0033] Table 2 Formulation composition of the examples and comparative examples (unit: parts by weight)

[0034] Preparation method: Step S1: Prepare a polyvinyl alcohol aqueous solution: Take about 10 parts by weight of water from the formula and add it to the reaction vessel. Start stirring and slowly add polyvinyl alcohol powder to fully wet and disperse it. Heat to 90°C and stir for 60 minutes to completely dissolve the polyvinyl alcohol. Cool to room temperature to obtain a polyvinyl alcohol aqueous solution.

[0035] Step S2: Prepare an aqueous solution of polyethylene oxide: Take another portion of the water (about 5 parts by weight) from the formula and add it to a dispersion container. Under medium-speed stirring at 400 rpm, slowly sprinkle the polyethylene oxide powder into the water to avoid clumping caused by adding it all at once. Continue stirring for 60 minutes, and then let it stand and mature for 12 hours to fully hydrate the polyethylene oxide and obtain a polyethylene oxide aqueous solution.

[0036] Step S3: Preparation of PEO / PVA composite drawing solution: The polyvinyl alcohol aqueous solution obtained in step S1 was cooled to 35°C, and the polyethylene oxide aqueous solution obtained in step S2 was slowly added while stirring at a low speed of 300 rpm. Stirring was continued for 30 minutes to obtain the PEO / PVA composite drawing fluid. High-shear dispersion equipment was avoided throughout the process.

[0037] Step S4: Preparation of basic coating slurry: Add the remaining water, NATROSOL 250 HBR, Vantex-T, AD7300A, PF-20, Polyglykol 400, and SN-DEFOAMER 154 to the dispersion tank, and stir at 800 rpm for 10 minutes until homogeneous. Add the sand flour, talc powder, and pearlescent powder, increase the dispersion speed to 1500 rpm, and disperse at high speed for 30 minutes. Take a sample to test the fineness, which should be ≤50μm, to obtain the base coating slurry.

[0038] Step S5: Paint Mixing: Reduce the rotation speed of the base coating slurry to 800 rpm, and add pure acrylic emulsion AC808A, Coasol 290, Acrysol RM-8W, AR TT-935, preservative, mildew inhibitor, and FoamStar ST2410AC in sequence, with each additive added at 2-minute intervals, and stir evenly; then add the PEO / PVA composite drawing liquid obtained in step S3, stir at 500 rpm for 20 minutes, adjust the pH to 8.0-8.5 with Vantex-T, adjust the viscosity to approximately 100 KU (Stormer viscosity) with the remaining water, filter through a 120-mesh filter and package to obtain the water-based silk texture effect art paint.

[0039] The preparation methods of Comparative Examples 1 and 2 are the same as those of the Examples, except that polyacrylamide is used instead of the PEO / PVA compound system.

[0040] Performance testing methods and results: The testing methods were conducted in accordance with GB / T 9756-2018 "Synthetic Resin Emulsion Interior Wall Coatings" and related industry standards. The string length test method involved using a standard brush to pick up paint, lifting it upwards at a uniform speed, and measuring the maximum length of the paint that naturally drooped to form a continuous string. The thermal storage stability test method involved storing the sample in a 55℃ constant temperature chamber for two weeks and measuring the change in Stormer viscosity before and after storage.

[0041] Table 3 Performance test results of the examples and comparative examples

[0042] in conclusion: As can be seen from the test results in Table 3, when only the type and amount of fiber-drawing aid differed, Examples 1 and 2 were significantly superior to Comparative Examples 1 and 2 in terms of fiber length and workability. Regarding thermal storage stability, the viscosity increase in Examples 1 and 2 was significantly lower than that in Comparative Examples 1 and 2. This demonstrates that using a blend of polyethylene oxide and polyvinyl alcohol as a fiber-drawing aid offers significant advantages in storage stability and workability compared to using polyacrylamide alone. PEO imparts excellent fiber-forming properties and lubricity to the system, while PVA enhances the toughness and texture retention of the filamentous structure. The synergistic effect of these two components results in excellent overall performance for the coating.

[0043] Example 3: Silk Texture Art Paint for Exterior Walls The difference between this embodiment and Example 1 is as follows: the aqueous film-forming emulsion used is silicone-acrylic emulsion (Tg=25℃), the pigment is adjusted to a combination of iron oxide red and titanium dioxide, mica powder (flaky filler) is added to the filler to enhance the light and shadow effect of the silk texture, the molecular weight of PEO is 2,000,000, the degree of alcoholysis of PVA is 98 mol%, the degree of polymerization is 1700, and the mass ratio of PEO to PVA is 1:6. The remaining components and preparation methods are basically the same as in Example 1. Testing showed that the silk texture art paint for exterior walls had a string length of 22 cm, a viscosity increase of 12 KU after 2 weeks of heat storage at 55℃, and no obvious chalking or discoloration after 800 hours of accelerated aging, demonstrating excellent weather resistance.

[0044] Example 4: High-gloss silk texture art paint The difference between this embodiment and Example 1 is that the amount of pearlescent powder added to the pigment is increased to 30%, and 2% of metallic effect pigment (copper gold powder) is added. The amount of sand flour in the filler is reduced to 1%, and the amount of ultrafine talc powder is increased. The molecular weight of PEO is 3,000,000, the degree of alcoholysis of PVA is 95 mol%, the degree of polymerization is 1500, and the mass ratio of PEO to PVA is 1:4. The remaining components and preparation methods are basically the same as in Example 1. Testing showed that the high-gloss silk-textured art paint has a silk-like drawing length of 23 cm, and the paint film exhibits a distinct metallic silk luster. The silk-like texture shows rich variations in brightness and darkness under different angles of light, resulting in a prominent decorative effect.

[0045] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water-based silk-textured artistic paint, characterized in that: include: Aqueous film-forming emulsions, polyethylene oxide, and polyvinyl alcohol; in, The polyethylene oxide is a water-soluble polymer with a weight average molecular weight of 100,000 to 8,000,000. The degree of alcoholysis of the polyvinyl alcohol is 80 mol% to 99.9 mol%, and the degree of polymerization is 300 to 3000. The mass ratio of polyethylene oxide to polyvinyl alcohol is 1:1 to 1:

20.

2. The water-based silk-textured artistic paint according to claim 1, characterized in that: The raw material components include the following percentages by mass: Water 15%–45%, aqueous film-forming emulsion 10%–45%, polyethylene oxide 0.03%–3.00%, polyvinyl alcohol 0.10%–8.00%, pigment 0%–25%, filler 4%–50%, dispersant 0.10%–1.50%, wetting agent 0.05%–1.00%, defoamer 0.05%–1.00%, preservative and mildew inhibitor 0.05%–1.00%, pH adjuster 0.05%–1.00%, film-forming aid 0%–5.00%, thickening and rheology modifier 0.05%–3.00%, other functional additives 0%–5.00%, the sum of all components is 100%.

3. The water-based silk-textured artistic paint according to claim 2, characterized in that: The polyethylene oxide has a weight-average molecular weight of 500,000 to 5,000,000, and is added at a rate of 0.05% to 2.00% of the total mass of the coating. The polyvinyl alcohol has a degree of alcoholysis of 87 mol% to 99 mol% and a degree of polymerization of 500 to 2400, and is added at a rate of 0.20% to 6.00% of the total mass of the coating.

4. The water-based silk-textured artistic paint according to claim 3, characterized in that: The polyethylene oxide has a weight-average molecular weight of 1,000,000 to 4,000,000, and is added at a rate of 0.10% to 1.20% of the total mass of the coating. The polyvinyl alcohol has a degree of alcoholysis of 88 mol% to 98 mol% and a degree of polymerization of 800 to 2000, and is added at a rate of 0.50% to 4.00% of the total mass of the coating.

5. The water-based silk-textured artistic paint according to claim 1, characterized in that: The mass ratio of polyethylene oxide to polyvinyl alcohol is 1:2 to 1:

12.

6. The water-based silk-textured artistic paint according to claim 5, characterized in that: The mass ratio of polyethylene oxide to polyvinyl alcohol is 1:3 to 1:

8.

7. The water-based silk-textured artistic paint according to claim 1, characterized in that: The aqueous film-forming emulsion is selected from one or more of the following: pure acrylic emulsion, styrene-acrylic emulsion, silicone-acrylic emulsion, vinyl acetate-acrylic emulsion, polyurethane dispersion, acrylic-polyurethane composite emulsion, and self-crosslinking acrylic emulsion, and its glass transition temperature Tg is -20℃ to 50℃.

8. The water-based silk-textured artistic paint according to claim 2, characterized in that: The pigments include one or more of the following: titanium dioxide, iron oxide pigments, carbon black, phthalocyanine pigments, pearlescent pigments, metallic effect pigments, and mica titanium pearlescent powder. The filler includes one or more of the following: calcium carbonate, sand flour, talc powder, kaolin, wollastonite powder, barite powder, mica powder, quartz powder, bentonite, and diatomaceous earth.

9. The water-based silk-textured artistic paint according to claim 2, characterized in that: The thickening rheology modifier is selected from one or more of the following: hydroxyethyl cellulose, hydroxypropyl methyl cellulose, alkali-swellable acrylic thickener, polyurethane associative thickener, bentonite, magnesium aluminum silicate, and xanthan gum.

10. A method for preparing the water-based silk-textured artistic paint according to claim 9, characterized in that: Includes the following steps: Step S1: Prepare a polyvinyl alcohol aqueous solution: Add some water to the reaction vessel, start stirring, slowly add polyvinyl alcohol powder, heat to 80℃~95℃, keep warm and stir for 30~120 minutes to completely dissolve the polyvinyl alcohol, and obtain a polyvinyl alcohol aqueous solution after cooling. Step S2: Prepare an aqueous solution of polyethylene oxide: Add another portion of water to a dispersion container, and slowly sprinkle in polyethylene oxide powder under medium-low speed stirring conditions. Stir for 30 to 180 minutes, and if necessary, let it stand for 2 to 24 hours to mature, to obtain a polyethylene oxide aqueous solution. Step S3: Preparation of PEO / PVA composite drawing solution: The polyvinyl alcohol aqueous solution obtained in step S1 is cooled to 20℃~50℃, and the polyethylene oxide aqueous solution obtained in step S2 is added under low-speed stirring. The mixture is stirred evenly to obtain PEO / PVA composite drawing liquid. Step S4: Preparation of basic coating slurry: Add the remaining water, dispersant, wetting agent, part of the defoamer, pH adjuster, cellulose thickener and other functional additives from the thickening rheology aid to the dispersion tank, stir evenly, then add pigments and fillers, and disperse at high speed to a fineness ≤80μm to obtain the basic coating slurry; Step S5: Paint Mixing: Under medium-low speed stirring, add water-based film-forming emulsion, film-forming aid, thickening rheology modifiers other than cellulose thickeners, preservatives and mildew inhibitors, remaining defoamers and other remaining functional additives to the base coating slurry. Each additive is added at intervals. After stirring evenly, add the PEO / PVA composite drawing liquid obtained in step S3, stir evenly at low speed, adjust the pH to 7.0-10.0, adjust the viscosity, filter and package to obtain the water-based silk texture effect art paint.

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