Preparation method of art coating capable of decomposing formaldehyde

Abstract

The invention discloses a preparation method of an art coating capable of decomposing formaldehyde, which is used in the field of coating preparation and comprises the following steps: preparing a basic coating part, the basic coating is prepared from, by mass, 30-40 parts of emulsion, 15-20 parts of titanium dioxide, 10-15 parts of heavy calcium carbonate powder, 5-10 parts of talcum powder, 1-2 parts of coalescing agent, 0.3-0.5 part of thickening agent, 0.1-0.2 part of mildew-proof bactericide, 0.2-0.3 part of defoaming agent and 10-15 parts of deionized water, the deionized water is added into a reaction kettle with low-speed stirring, then the thickening agent, the mildew-proof bactericide and the defoaming agent are sequentially added, stirring is conducted for 10-15 min, and the paint is obtained. Fully dissolving and uniformly dispersing to form a premixed solution; the art coating is divided into the basic coating and the formaldehyde decomposition composition, so that the preparation process is more convenient, the composition not only can be suitable for the basic coating in the scheme, but also can be suitable for other coatings, the application range is wide, and the composition adopts three different-state preparation modes and is convenient to select according to needs.

Description

Technical Field

[0001] The invention relates to the field of coating preparation, and in particular to a method for preparing an artistic coating capable of decomposing formaldehyde. Background Art

[0002] As people's living standards improve, they pay more and more attention to indoor air quality. Formaldehyde, as one of the main pollutants in indoor decoration pollution, has been widely recognized for its hazards. Traditional wall paints mainly focus on decorative functions, such as providing beautiful colors, good coverage and flatness, etc., to meet people's demand for the aesthetics of living environment. However, in the newly decorated environment, furniture, panels, etc. continue to release formaldehyde. It is difficult to quickly and effectively remove formaldehyde by conventional means such as ventilation alone. This has led to the emergence of paints with formaldehyde decomposition function.

[0003] In previous technical attempts, some coatings simply added some adsorbent materials to deal with the formaldehyde problem, such as activated carbon powder, but the adsorption effect is often limited and easy to reach adsorption saturation. Once saturated, formaldehyde may be released again, causing secondary pollution. In addition, although some early photocatalytic coatings introduced photocatalytic materials such as nano-titanium dioxide, their poor dispersion in the coating system resulted in low photocatalytic efficiency and could not fully play the role of decomposing formaldehyde. At the same time, the basic properties of the coating, such as film-forming property, scrub resistance, color stability, etc., are difficult to balance with the formaldehyde decomposition function. Either the decorative requirements are met but the formaldehyde decomposition effect is poor, or the decomposition function is over-emphasized, which greatly reduces the construction and appearance of the coating. In addition, different usage scenarios have different requirements for the state of the coating. For example, in automated high-precision construction scenarios, liquid coatings may be preferred for accurate addition and mixing, while manual construction scenarios or places that require long-term decomposition of formaldehyde have different requirements for the fluidity and storage stability of the coating. The existing single coating formula and process cannot fully meet the diverse needs.

[0004] Currently, no effective solution has been proposed for the above technical problems. Summary of the invention

[0005] In order to overcome the above problems, the present invention aims to propose a method for preparing an artistic paint that can decompose formaldehyde, with the aim of solving the technical problem that different usage scenarios have different requirements for the paint state that cannot be achieved in the prior art.

[0006] To this end, the specific technical solution adopted by the present invention is as follows:

[0007] According to one aspect of the present invention, a method for preparing an artistic coating capable of decomposing formaldehyde is provided, the method comprising the following steps:

[0008] S1. Prepare a base coating, wherein the base coating comprises, by mass, 30-40 parts of emulsion, 15-20 parts of titanium dioxide, 10-15 parts of heavy calcium powder, 5-10 parts of talc, 1-2 parts of film-forming aid, 0.3-0.5 parts of thickener, 0.1-0.2 parts of mildew and fungicide, 0.2-0.3 parts of defoamer, and 10-15 parts of deionized water. Add deionized water to a slow-speed stirring reactor, then add the thickener, mildew and fungicide, and defoamer in sequence, and stir for 10-15 minutes to fully dissolve and disperse them evenly to form a premixed liquid.

[0009] S2. After increasing the speed of the premixed liquid reactor prepared in S1 to 1200-1500 rpm, titanium dioxide, heavy calcium powder, and talcum powder are added in sequence, and stirred for 30-45 minutes to obtain a uniform base coating paste. The stirring speed is reduced to 400-600 rpm, and the emulsion and film-forming aid are added, and stirred for 15-20 minutes to fully mix the emulsion and the paste to obtain a base coating;

[0010] S3, preparing materials for preparing a formaldehyde decomposition composition, specifically including nano titanium dioxide, negative ion powder, dispersant, binder, surfactant, cosolvent, thickener, and deionized water;

[0011] S4, preparing formaldehyde decomposing compositions in three states: granular, semi-fluid and liquid according to the materials in S3;

[0012] S5. Select a formaldehyde decomposition combination in a suitable state from S4 and mix it with the basic paint prepared in S1 and S2 to obtain an artistic paint that can decompose formaldehyde.

[0013] Optionally, in S4, the granular formaldehyde decomposition composition materials are as follows in parts by mass: 20-30 nano titanium dioxide, 10-15 negative ion powder, 2-3 dispersant, 5-8 binder, 0 surfactant, 0 cosolvent, 0 thickener, and 40-50 deionized water, wherein the dispersant is sodium hexametaphosphate and the binder is polyvinyl alcohol.

[0014] Optionally, in S4, the preparation method of the granular formaldehyde decomposition composition is as follows:

[0015] Sa41, add 45 parts of deionized water into the reactor, start stirring, set the speed to 700 rpm, add 2.5 parts of sodium hexametaphosphate, stir for 12 minutes to fully dissolve it, and obtain a solution;

[0016] Sa42, add 25 parts of nano titanium dioxide and 12 parts of negative ion powder to the solution of Sa41 in sequence, increase the stirring speed to 1100 rpm after adding, continue stirring for 40 minutes, and obtain a uniform slurry after the powder is evenly dispersed;

[0017] Sa43, dissolve 6 parts of polyvinyl alcohol in twice the amount of deionized water, add to the slurry prepared in Sa42, and continue stirring for 25 minutes to fully mix the polyvinyl alcohol and the slurry;

[0018] Sa44, drying and granulation are carried out by spray drying equipment, the drying air inlet temperature is controlled at 200°C, and the air outlet temperature is controlled at 90°C to obtain a granular formaldehyde decomposition composition.

[0019] Optionally, in S4, the semi-fluid formaldehyde decomposition composition materials are as follows in parts by mass: 20-30 nano titanium dioxide, 10-15 negative ion powder, 2-3 dispersant, 0 binder, 0 surfactant, 0 cosolvent, 0.5-1.5 thickener, and 50-60 deionized water, wherein the dispersant is sodium hexametaphosphate and the thickener is xanthan gum.

[0020] Optionally, in S4, the preparation method of the semi-fluid formaldehyde decomposition composition is as follows:

[0021] Sb41, add 55 parts of deionized water into the reactor, start stirring, control the speed at 700 rpm, add 2 parts of sodium hexametaphosphate, stir for 12 minutes to fully dissolve it, and obtain a solution;

[0022] Sb42, add 22 parts of nano titanium dioxide and 10 parts of negative ion powder to the solution prepared in Sb41, increase the stirring speed to 1100 rpm after adding, continue stirring for 35 minutes, and obtain a uniform slurry after the powder is evenly dispersed;

[0023] Sb43. Add 1 part of xanthan gum to the slurry prepared in Sb42, reduce the stirring speed to 500 rpm, stir for 25 minutes to evenly disperse the thickener in the system, adjust the viscosity of the system to a semi-fluid state, and finally obtain a semi-fluid formaldehyde decomposition composition.

[0024] Optionally, in S4, the liquid formaldehyde decomposition composition materials are as follows in parts by mass: 20-30 nano titanium dioxide, 10-15 negative ion powder, 3-5 dispersant, 0 binder, 1-2 surfactant, 5-10 cosolvent, 0 thickener, and 40-50 deionized water, wherein the dispersant is sodium salt of polycarboxylate, the surfactant is sodium dodecylbenzene sulfonate, and the cosolvent is propylene glycol.

[0025] Optionally, in S4, the preparation method of the liquid formaldehyde decomposition composition is as follows:

[0026] Sc41, add 46 parts of deionized water into the reactor of the high-speed disperser, start stirring, control the speed at 900 rpm, add 8 parts of propylene glycol, 4 parts of polycarboxylate sodium salt dispersant and 1.5 parts of sodium dodecylbenzene sulfonate in sequence, stir for 12 minutes, and obtain a slurry after fully dissolving;

[0027] Sc42, add 28 parts of nano titanium dioxide and 13 parts of negative ion powder to the slurry prepared in Sc41 in sequence, continue stirring for 50 minutes after adding, and after uniform dispersion, obtain a preliminary liquid formaldehyde decomposition composition;

[0028] Sc43. Grind the preliminary liquid formaldehyde decomposition composition prepared in Sc42 by a sand mill to refine the particles to obtain a final liquid formaldehyde decomposition composition.

[0029] Optionally, the preparation method of mixing the granular formaldehyde decomposing composition and the basic coating in S5 is as follows: add the prepared basic coating to a stirring kettle, start stirring, control the speed at 500-600rpm, add 3%-15% of the granular formaldehyde decomposing composition, continue stirring for 20-30 minutes, and then filter through a filter to obtain an artistic coating that can decompose formaldehyde.

[0030] Optionally, the semi-fluid formaldehyde decomposition composition in S5 is mixed with the basic coating to prepare the following method: add the prepared basic coating to a stirring kettle, start stirring, control the speed at 600-700rpm, add 3%-15% of the semi-fluid formaldehyde decomposition composition, continue stirring for 20-30 minutes, and then filter through a filter to obtain an artistic coating that can decompose formaldehyde.

[0031] Optionally, the preparation method of mixing the liquid formaldehyde decomposing composition with the basic coating in S5 is as follows: add the prepared basic coating to a stirring kettle, start stirring, control the speed at 700-800rpm, add 3%-15% of the liquid formaldehyde decomposing composition, continue stirring for 20-30 minutes, and then filter through a filter to obtain an artistic coating that can decompose formaldehyde.

[0032] Compared with the prior art, this application has the following beneficial effects:

[0033] 1. This process uses a combination of nano-titanium dioxide and negative ion powder as the core components for decomposing formaldehyde. The electron-hole pairs generated by nano-titanium dioxide under light conditions can generate highly oxidizing superoxide anions and hydroxyl free radicals. These free radicals can directly oxidize formaldehyde into harmless carbon dioxide and water. The negative ions released by the negative ion powder further promote the redox reaction and synergistically enhance the formaldehyde decomposition ability. Compared with traditional adsorption materials, it fundamentally solves the formaldehyde pollution problem and avoids the risk of secondary pollution.

[0034] 2. By optimizing the preparation process of the raw materials for decomposing formaldehyde concentration, whether in the form of particles, liquid or semi-fluid, the good dispersion of nano titanium dioxide and negative ion powder in the system is ensured. For example, in the liquid preparation, efficient polycarboxylate sodium salt dispersant and surfactant are used to make the powder evenly dispersed, greatly improving the photocatalytic efficiency, effectively decomposing formaldehyde in the air, and purifying the indoor air.

[0035] 3. The entire artistic coating is divided into two parts: a base coating and a formaldehyde decomposition composition. On the one hand, the formaldehyde decomposition composition can be applied to the base coating proposed in this scheme as well as other coatings, and has a wider range of applications. Secondly, the formaldehyde decomposition composition is prepared in three different states. The three states of the prepared formaldehyde decomposition concentrated raw materials can be selected as needed, and the specific effects are as follows:

[0036] The granular form is convenient for storage and transportation, and performs well in scenarios where formaldehyde decomposition components are slowly released over a long period of time, such as when used for adding air purification filters or wall paint in long-term living environments. Construction workers can use metering equipment to add it to the base paint as needed to accurately control the formaldehyde decomposition performance;

[0037] The liquid has excellent fluidity and dispersibility, and is suitable for high-precision automated coating production lines. It can be perfectly integrated with other liquid additives. In the production of high-end artistic coatings, automotive coatings and other products with stringent quality and process requirements, it can be quickly and evenly dispersed into the coating system to ensure that the coating quickly decomposes formaldehyde, while meeting the requirements of fine color matching and appearance.

[0038] The semi-fluid state has both fluidity and stability, and is the preferred choice for general-purpose building coatings. In manual residential and office wall painting, it will not flow and affect construction, and can ensure that the decomposed formaldehyde components are evenly distributed. It also has good compatibility with a variety of paint bases such as water-based and oil-based, and does not destroy the original basic properties of the coating such as film-forming and drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above characteristics, features and advantages of the present invention and their implementation methods and methods will become more clearly understood in conjunction with the following description of the embodiments, which are described in detail in conjunction with the accompanying drawings. Herein, a schematic diagram is shown:

[0040] Figure 1 The present invention is a flowchart of a method for preparing an artistic coating capable of decomposing formaldehyde according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Embodiment 1

[0043] According to an embodiment of the present invention, a method for preparing an artistic coating capable of decomposing formaldehyde is provided.

[0044] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1 As shown, according to one embodiment of the present invention, a method for preparing an artistic coating capable of decomposing formaldehyde is provided, the method comprising the following steps:

[0045] S1. Prepare the base coating part, which includes 30-40 parts by mass of emulsion, 15-20 parts of titanium dioxide, 10-15 parts of heavy calcium powder, 5-10 parts of talc, 1-2 parts of film-forming aid, 0.3-0.5 parts of thickener, 0.1-0.2 parts of mildew and fungicide, 0.2-0.3 parts of defoamer, and 10-15 parts of deionized water. Add deionized water to a slow-speed stirring reactor, and then add thickener, mildew and fungicide, and defoamer in sequence, and stir for 10-15 minutes to fully dissolve and disperse them evenly to form a premixed liquid;

[0046] S2. After increasing the speed of the premixed liquid reactor prepared in S1 to 1200-1500 rpm, titanium dioxide, heavy calcium powder, and talcum powder are added in sequence, and stirred for 30-45 minutes to obtain a uniform base coating paste. The stirring speed is reduced to 400-600 rpm, and the emulsion and film-forming aid are added, and stirred for 15-20 minutes to fully mix the emulsion and the paste to obtain a base coating;

[0047] S3, preparing materials for preparing a formaldehyde decomposition composition, specifically including nano titanium dioxide, negative ion powder, dispersant, binder, surfactant, cosolvent, thickener, and deionized water;

[0048] S4, preparing formaldehyde decomposing compositions in three states: granular, semi-fluid and liquid according to the materials in S3;

[0049] S5. Select a formaldehyde decomposition combination in a suitable state from S4 and mix it with the basic paint prepared in S1 and S2 to obtain an artistic paint that can decompose formaldehyde.

[0050] Preferably, in S4, the granular formaldehyde decomposition composition materials are as follows in parts by mass: 20-30 nano titanium dioxide, 10-15 negative ion powder, 2-3 dispersant, 5-8 binder, 0 surfactant, 0 cosolvent, 0 thickener, and 40-50 deionized water, wherein the dispersant is sodium hexametaphosphate and the binder is polyvinyl alcohol.

[0051] Preferably, in S4, the semi-fluid formaldehyde decomposition composition materials are as follows in parts by mass: 20-30 nano titanium dioxide, 10-15 negative ion powder, 2-3 dispersant, 0 binder, 0 surfactant, 0 cosolvent, 0.5-1.5 thickener, and 50-60 deionized water, wherein the dispersant is sodium hexametaphosphate and the thickener is xanthan gum.

[0052] Preferably, in S4, the materials of the liquid formaldehyde decomposition composition are as follows in parts by mass: 20-30 nano titanium dioxide, 10-15 negative ion powder, 3-5 dispersant, 0 binder, 1-2 surfactant, 5-10 cosolvent, 0 thickener, and 40-50 deionized water, wherein the dispersant is sodium salt of polycarboxylate, the surfactant is sodium dodecylbenzene sulfonate, and the cosolvent is propylene glycol.

[0053] It should be noted that when the nano-titanium dioxide in the base coating is exposed to light, electron-hole pairs will be generated on its surface. The electrons (e-) react with oxygen in the air to generate superoxide anions (·O2-), and the holes (h + ) reacts with the water adsorbed on the surface to generate hydroxyl radicals (·OH). These strong oxidizing free radicals can oxidize formaldehyde (HCHO) into carbon dioxide (CO2) and water (H2O). The chemical reaction formula is as follows:

[0054] TiO2+hv→e-+h + ;

[0055] e-+O2→·O 2 - ;

[0056] h + +H 2 O→·OH+H + ;

[0057] ·O 2 - +HCHO→H 2 O+CO 2 +Other products;

[0058] OH+HCHO→H 2 O+CO 2 +Other products;

[0059] The negative ions released by negative ion powder can combine with oxygen, water molecules, etc. in the air to form substances with strong redox properties, further promoting the decomposition reaction of formaldehyde. Overall, formaldehyde is decomposed into harmless substances through a series of redox reactions.

[0060] Preferably, in S4, the preparation method of the granular formaldehyde decomposition composition is as follows:

[0061] Sa41, add 45 parts of deionized water into the reactor, start stirring, set the speed to 700 rpm, add 2.5 parts of sodium hexametaphosphate, stir for 12 minutes to fully dissolve it, and obtain a solution;

[0062] Sa42, add 25 parts of nano titanium dioxide and 12 parts of negative ion powder to the solution of Sa41 in sequence, increase the stirring speed to 1100 rpm after adding, continue stirring for 40 minutes, and obtain a uniform slurry after the powder is evenly dispersed;

[0063] Sa43, dissolve 6 parts of polyvinyl alcohol in twice the amount of deionized water, add to the slurry prepared in Sa42, and continue stirring for 25 minutes to fully mix the polyvinyl alcohol and the slurry;

[0064] Sa44, drying and granulation are carried out by spray drying equipment, the drying air inlet temperature is controlled at 200°C, and the air outlet temperature is controlled at 90°C to obtain a granular formaldehyde decomposition composition.

[0065] It should be noted that because the granular formaldehyde-decomposing composition can slowly release the effective ingredients for decomposing formaldehyde in the paint for a long time, it can effectively deal with the long-term formaldehyde emission in the indoor environment. If the artistic paint is mainly used in long-term living environments, such as family bedrooms, nursing homes and other places, granular formaldehyde-decomposing raw materials are a better choice.

[0066] Preferably, in S4, the preparation method of the semi-fluid formaldehyde decomposition composition is as follows:

[0067] Sb41, add 55 parts of deionized water into the reactor, start stirring, control the speed at 700 rpm, add 2 parts of sodium hexametaphosphate, stir for 12 minutes to fully dissolve it, and obtain a solution;

[0068] Sb42, add 22 parts of nano titanium dioxide and 10 parts of negative ion powder to the solution prepared in Sb41, increase the stirring speed to 1100 rpm after adding, continue stirring for 35 minutes, and obtain a uniform slurry after the powder is evenly dispersed;

[0069] Sb43. Add 1 part of xanthan gum to the slurry prepared in Sb42, reduce the stirring speed to 500 rpm, stir for 25 minutes to evenly disperse the thickener in the system, adjust the viscosity of the system to a semi-fluid state, and finally obtain a semi-fluid formaldehyde decomposition composition.

[0070] It should be noted that because the semi-fluid formaldehyde decomposition composition has both fluidity and stability, good construction performance, can adapt to manual construction tools such as brushes and rollers, and has good compatibility with most general-purpose artistic paint systems, semi-fluid formaldehyde decomposition raw materials are more suitable for wall painting in general buildings, such as ordinary residences and offices.

[0071] Preferably, in S4, the preparation method of the liquid formaldehyde decomposition composition is as follows:

[0072] Sc41, add 46 parts of deionized water into the reactor of the high-speed disperser, start stirring, control the speed at 900 rpm, add 8 parts of propylene glycol, 4 parts of polycarboxylate sodium salt dispersant and 1.5 parts of sodium dodecylbenzene sulfonate in sequence, stir for 12 minutes, and obtain a slurry after fully dissolving;

[0073] Sc42, add 28 parts of nano titanium dioxide and 13 parts of negative ion powder to the slurry prepared in Sc41 in sequence, continue stirring for 50 minutes after adding, and after uniform dispersion, obtain a preliminary liquid formaldehyde decomposition composition;

[0074] Sc43. Grind the preliminary liquid formaldehyde decomposition composition prepared in Sc42 by a sand mill to refine the particles to obtain a final liquid formaldehyde decomposition composition.

[0075] It should be noted that because the liquid formaldehyde decomposition composition has good dispersibility, it can enable the formaldehyde decomposition components to quickly contact formaldehyde and take effect, and it is also easier to operate in the high-precision paint production process. For newly renovated commercial places, such as shopping malls, exhibition halls, etc., formaldehyde needs to be quickly decomposed in a short time to meet business standards, and the construction process usually has higher precision requirements. At this time, liquid formaldehyde decomposition raw materials are more suitable.

[0076] Preferably, the preparation method of mixing the granular formaldehyde decomposing composition and the basic coating in S5 is as follows: add the prepared basic coating to a stirring kettle, start stirring, control the speed at 500-600rpm, add 3%-15% of the granular formaldehyde decomposing composition, continue stirring for 20-30 minutes, and then filter through a filter to obtain an artistic coating that can decompose formaldehyde.

[0077] It should be noted that the advantages of choosing a granular formaldehyde decomposition composition are as follows:

[0078] 1) Granular materials have good stability and are not easily affected by external factors such as vibration and temperature changes, which may cause changes in properties. The interaction force between particles is small. Compared with semi-fluids or liquids, they are less likely to leak or deteriorate during packaging and storage. For example, granular materials can better maintain their integrity and performance during long-distance transportation or long-term storage.

[0079] 2) The size and quality of the particles are relatively uniform. When added to the paint, the number of added particles can be accurately controlled by precise metering equipment, such as electronic balances, particle counters, etc., so as to more accurately control the content of decomposed formaldehyde components in the paint. This is very important for paint products that have strict requirements on formaldehyde decomposition performance.

[0080] 3) In the coating system, the granular raw materials for decomposing formaldehyde can achieve a slow release function. As the coating dries and is used, the particles come into contact with the external environment, and the effective ingredients therein, such as nano titanium dioxide and negative ion powder, can be gradually released to play a role in decomposing formaldehyde, thereby extending the effective time for decomposing formaldehyde.

[0081] Applicable situations are as follows:

[0082] 1) For some coatings that need to play the function of decomposing formaldehyde for a long time, such as wall coatings used in indoor long-term living environments, such as family bedrooms, study rooms, etc., granular formaldehyde-decomposing raw materials are a good choice. It can continuously release components that decompose formaldehyde over a long period of time, effectively improving indoor air quality.

[0083] 2) When the paint needs to be applied to some special carriers, such as breathable diatom mud walls, fibrous decorative materials, etc., granular raw materials can better combine with these carriers. For example, in diatom mud paint, the particles can be embedded in the pore structure of diatom mud. With the circulation of air, the components that decompose formaldehyde are slowly released without affecting the breathability of the diatom mud itself.

[0084] 3) If the paint manufacturer needs to provide the formaldehyde decomposition function as an optional additional function to customers with different needs, the granular raw materials can be conveniently pre-mixed with other basic paints and added when the customer needs it, so as to flexibly adjust the function of the paint.

[0085] Preferably, the semi-fluid formaldehyde decomposition composition in S5 is mixed with the basic coating to prepare the following method: add the prepared basic coating to a stirring kettle, start stirring, control the speed at 600-700rpm, add 3%-15% of the semi-fluid formaldehyde decomposition composition, continue stirring for 20-30 minutes, and then filter through a filter to obtain an artistic coating that can decompose formaldehyde.

[0086] It should be noted that the advantages of choosing a semi-fluid formaldehyde decomposition composition are as follows:

[0087] 1) The semi-fluid state has a certain fluidity, which allows it to diffuse well in the paint, and a certain consistency, so that the effective ingredients will not easily precipitate or stratify in the paint system. This characteristic ensures the uniform distribution and long-term stability of the formaldehyde decomposition components in the paint, which is beneficial to the continuous decomposition of formaldehyde throughout the entire service life of the paint.

[0088] 2) During the paint construction process, semi-fluid raw materials can better adapt to different construction tools, such as brushes, rollers, spray guns, etc. It will not be too thin like liquid to cause flowing, nor will it cause clogging of construction tools like particles. For example, during the brushing process, semi-fluid paint can be evenly adhered to the wall to ensure construction quality and appearance.

[0089] 3) Semi-fluid formaldehyde decomposition raw materials can be more easily integrated with different types of coating matrices, such as water-based paint, oil-based paint, latex paint, etc. Its moderate viscosity and rheological properties enable it to find a suitable balance point in the viscosity and ingredient system of various coatings without destroying the original basic properties of the coating, such as film-forming properties, drying time, hardness, etc.

[0090] Applicable situations are as follows:

[0091] 1) For most common indoor and outdoor wall coatings, floor coatings, etc., semi-fluid raw materials for decomposing formaldehyde are a relatively common choice. In actual use, these coatings need to comprehensively consider factors such as construction convenience, formaldehyde decomposition performance and cost. The semi-fluid state can just meet these requirements and can effectively decompose formaldehyde in indoor and outdoor environments while ensuring basic functions.

[0092] 2) In some small-scale decoration projects or DIY paint application scenarios, construction mainly relies on manual tools such as brushes and rollers. Semi-fluid paint is easier to operate manually, and users can more easily control the thickness and uniformity of the paint. For example, when home users renovate their interior walls themselves, using paint containing semi-fluid formaldehyde-decomposing raw materials can ensure the construction quality while achieving the function of decomposing formaldehyde.

[0093] 3) If the paint needs to be stored in some more complex environmental conditions, such as warehouses and construction sites with large changes in temperature and humidity, or the paint's own component system has high requirements for stability, such as containing a variety of additives that are easy to interact with each other, semi-fluid formaldehyde decomposition raw materials can enhance the overall stability of the paint. Its stable presence in the paint system helps maintain the quality and performance of the paint and avoid affecting the use effect of the paint due to changes in the decomposition of formaldehyde components.

[0094] Preferably, the preparation method of mixing the liquid formaldehyde decomposing composition and the basic coating in S5 is as follows: add the prepared basic coating to a stirring kettle, start stirring, control the speed at 700-800rpm, add 3%-15% of the liquid formaldehyde decomposing composition, continue stirring for 20-30 minutes, and then filter through a filter to obtain an artistic coating that can decompose formaldehyde.

[0095] It should be noted that the advantages of choosing a liquid formaldehyde decomposition composition are as follows:

[0096] 1) The formaldehyde decomposition raw materials in liquid state can achieve better dispersion effect in the coating. Due to its good fluidity, when mixed with other components of the coating, it can more easily penetrate into various parts of the coating system, ensuring that the effective ingredients such as nano titanium dioxide and negative ion powder are evenly distributed. This helps to improve the overall formaldehyde decomposition performance of the coating and avoid affecting the decomposition effect due to excessive or low local concentration.

[0097] 2) During the coating production process, liquid materials can be accurately and conveniently added through pipeline transportation, metering pumps and other equipment, and the mixing process with the coating is also simpler and more efficient. It does not require special stirring equipment or long stirring to ensure uniform mixing like granular or semi-fluid materials. This can improve the production efficiency of the coating and reduce production time and cost.

[0098] 3) Liquid raw materials are easy to mix and formulate with other liquid additives, such as pigment dispersions, special functional additives, etc. This allows for more flexibility in adjusting the formaldehyde decomposition function according to different usage requirements, such as color changes, addition of other additional functions, etc., to maintain a balance in the overall performance of the coating.

[0099] Applicable situations are as follows:

[0100] 1) In some occasions where the quality and performance of coatings are required to be high and the production process is relatively sophisticated, such as high-end artistic coatings, automotive coatings, etc., liquid formaldehyde decomposition raw materials are an ideal choice. These coatings usually require strict control of the dispersion and uniformity of each component to ensure good appearance and performance. Liquid materials can meet this requirement well.

[0101] 2) For companies that use automated production lines to produce coatings, liquid raw materials are more compatible with automated equipment. Through precise metering and automatic addition systems, stable and efficient production can be achieved, and the consistency of product quality can be better guaranteed.

[0102] 3) If the coating application scenario needs to quickly decompose formaldehyde in a short period of time, such as wall coatings used in newly renovated commercial places such as shopping malls, hotels, etc., the liquid formaldehyde decomposition raw materials can contact and react with formaldehyde in the air more quickly, because their good dispersibility allows the active ingredients to be quickly exposed to the formaldehyde environment and start the decomposition process.

[0103] Embodiment 2

[0104] The components of granular, semi-fluid and liquid are shown in Table 1:

[0105]

[0106]

[0107] Table 1

[0108] Test Example 1

[0109] The influence of the addition ratio of 3%-15% particulate matter to formaldehyde composition and base coating is shown in Table 2:

[0110]

[0111] Table 2

[0112] Test Example 2

[0113] The influence of the addition ratio of 3%-15% semi-fluid decomposition formaldehyde composition to the base coating is shown in Table 3:

[0114]

[0115] Table 3

[0116] Test Example 3

[0117] The effect of adding 3%-15% liquid decomposition formaldehyde composition to the base coating is shown in Table 4:

[0118]

[0119]

[0120] Table 4

[0121] The experimental methods based on Experimental Example 1, Experimental Example 2, and Experimental Example 3 are as follows:

[0122] Viscosity: measured using a rotational viscometer. A rotational viscometer is used to measure the viscosity of paints at different ratios. The paint sample is placed in the measuring system of the viscometer. The viscosity value is obtained by measuring the resistance encountered by the rotor rotating in the paint at a speed of 200 rpm.

[0123] Drying time: Use the finger touch drying test. On the surface of the painted sample, gently touch the paint surface with your finger every five minutes. The surface is dry when the finger does not stick to the paint. Record the time at this time as the surface drying time.

[0124] Hardness and wear resistance. The hardness is measured using a Shore hardness tester. The indenter of the hardness tester is pressed vertically on the coating surface, and the value of the hardness tester is read to indicate the hardness of the coating. The wear resistance is measured using a Taber abraser. The coating sample is fixed on the instrument workbench. Under a pressure of 1000g, a rotating silicon carbide grinding wheel is rubbed against the sample surface. After 200 wear cycles, the mass loss of the sample or the reduction in coating thickness is measured to evaluate the wear resistance.

[0125] Formaldehyde decomposition efficiency: The environmental chamber experiment was conducted by placing the sample coated with paint in a sealed environmental chamber and injecting 1 mg / m 3 The formaldehyde concentration in the environmental chamber is monitored in real time by a formaldehyde detector.

[0126] Although the present invention has been disclosed as above with preferred embodiments, the embodiments are merely examples for the convenience of description and are not intended to limit the present invention. Those skilled in the art may make several changes and modifications without departing from the spirit and scope of the present invention. The scope of protection claimed by the present invention shall be based on the claims.

Claims

1. A method for preparing an artistic coating capable of decomposing formaldehyde, characterized in that: The preparation method comprises the following steps: S1. Prepare a base coating, wherein the base coating comprises, by mass, 30-40 parts of emulsion, 15-20 parts of titanium dioxide, 10-15 parts of heavy calcium powder, 5-10 parts of talc, 1-2 parts of film-forming aid, 0.3-0.5 parts of thickener, 0.1-0.2 parts of mildew and fungicide, 0.2-0.3 parts of defoamer, and 10-15 parts of deionized water. Add deionized water to a slow-speed stirring reactor, then add the thickener, mildew and fungicide, and defoamer in sequence, and stir for 10-15 minutes to fully dissolve and disperse them evenly to form a premixed liquid. S2. After increasing the speed of the premixed liquid reactor prepared in S1 to 1200-1500 rpm, titanium dioxide, heavy calcium powder, and talcum powder are added in sequence, and stirred for 30-45 minutes to obtain a uniform base coating paste. The stirring speed is reduced to 400-600 rpm, and the emulsion and film-forming aid are added, and stirred for 15-20 minutes to fully mix the emulsion and the paste to obtain a base coating; S3, preparing materials for preparing a formaldehyde decomposition composition, specifically including nano titanium dioxide, negative ion powder, dispersant, binder, surfactant, cosolvent, thickener, and deionized water; S4, preparing formaldehyde decomposing compositions in three states: granular, semi-fluid and liquid according to the materials in S3; S5. Select a formaldehyde decomposition combination in a suitable state from S4 and mix it with the basic paint prepared in S1 and S2 to obtain an artistic paint that can decompose formaldehyde.

2. The method for preparing an artistic coating capable of decomposing formaldehyde according to claim 1, characterized in that: In S4, the granular formaldehyde decomposition composition materials are as follows in parts by mass: 20-30 nano titanium dioxide, 10-15 negative ion powder, 2-3 dispersant, 5-8 binder, 0 surfactant, 0 cosolvent, 0 thickener, and 40-50 deionized water, wherein the dispersant is sodium hexametaphosphate and the binder is polyvinyl alcohol.

3. The method for preparing an artistic coating capable of decomposing formaldehyde according to claim 2, characterized in that: In S4, the preparation method of the granular formaldehyde decomposition composition is as follows: Sa41, add 45 parts of deionized water into the reactor, start stirring, set the speed to 700 rpm, add 2.5 parts of sodium hexametaphosphate, stir for 12 minutes to fully dissolve it, and obtain a solution; Sa42, add 25 parts of nano titanium dioxide and 12 parts of negative ion powder to the solution of Sa41 in sequence, increase the stirring speed to 1100 rpm after adding, continue stirring for 40 minutes, and obtain a uniform slurry after the powder is evenly dispersed; Sa43, dissolve 6 parts of polyvinyl alcohol in twice the amount of deionized water, add to the slurry prepared in Sa42, and continue stirring for 25 minutes to fully mix the polyvinyl alcohol and the slurry; Sa44, drying and granulation are carried out by spray drying equipment, the drying air inlet temperature is controlled at 200°C, and the air outlet temperature is controlled at 90°C to obtain a granular formaldehyde decomposition composition.

4. The method for preparing an artistic coating capable of decomposing formaldehyde according to claim 1, characterized in that: In S4, the semi-fluid formaldehyde decomposition composition materials are as follows in parts by mass: 20-30 nano titanium dioxide, 10-15 negative ion powder, 2-3 dispersant, 0 binder, 0 surfactant, 0 cosolvent, 0.5-1.5 thickener, and 50-60 deionized water, wherein the dispersant is sodium hexametaphosphate and the thickener is xanthan gum.

5. The method for preparing an artistic coating capable of decomposing formaldehyde according to claim 4, characterized in that: In S4, the preparation method of the semi-fluid decomposition formaldehyde composition is as follows: Sb41, add 55 parts of deionized water into the reactor, start stirring, control the speed at 700 rpm, add 2 parts of sodium hexametaphosphate, stir for 12 minutes to fully dissolve it, and obtain a solution; Sb42, add 22 parts of nano titanium dioxide and 10 parts of negative ion powder to the solution prepared in Sb41, increase the stirring speed to 1100 rpm after adding, continue stirring for 35 minutes, and obtain a uniform slurry after the powder is evenly dispersed; Sb43. Add 1 part of xanthan gum to the slurry prepared in Sb42, reduce the stirring speed to 500 rpm, stir for 25 minutes to evenly disperse the thickener in the system, adjust the viscosity of the system to a semi-fluid state, and finally obtain a semi-fluid formaldehyde decomposition composition.

6. The method for preparing an artistic coating capable of decomposing formaldehyde according to claim 1, characterized in that: In S4, the materials of the liquid formaldehyde decomposition composition are as follows in parts by mass: 20-30 parts of nano titanium dioxide, 10-15 parts of negative ion powder, 3-5 parts of dispersant, 0 parts of binder, 1-2 parts of surfactant, 5-10 parts of cosolvent, 0 parts of thickener, and 40-50 parts of deionized water, wherein the dispersant is sodium salt of polycarboxylate, the surfactant is sodium dodecylbenzene sulfonate, and the cosolvent is propylene glycol.

7. The method for preparing an artistic coating capable of decomposing formaldehyde according to claim 6, characterized in that: In S4, the preparation method of the liquid formaldehyde decomposition composition is as follows: Sc41, add 46 parts of deionized water into the reactor of the high-speed disperser, start stirring, control the speed at 900 rpm, add 8 parts of propylene glycol, 4 parts of polycarboxylate sodium salt dispersant and 1.5 parts of sodium dodecylbenzene sulfonate in sequence, stir for 12 minutes, and obtain a slurry after fully dissolving; Sc42, add 28 parts of nano titanium dioxide and 13 parts of negative ion powder to the slurry prepared in Sc41 in sequence, continue stirring for 50 minutes after adding, and after uniform dispersion, obtain a preliminary liquid formaldehyde decomposition composition; Sc43. Grind the preliminary liquid formaldehyde decomposition composition prepared in Sc42 by a sand mill to refine the particles to obtain a final liquid formaldehyde decomposition composition.

8. The method for preparing an artistic coating capable of decomposing formaldehyde according to claim 1, characterized in that: The preparation method of mixing the formaldehyde decomposing composition with the base coating in S5 is as follows: Add the prepared basic coating into a stirring kettle, start stirring, control the speed at 500-600rpm, add 3%-15% of the granular formaldehyde decomposing composition, continue stirring for 20-30 minutes, and then filter through a filter to obtain an artistic coating that can decompose formaldehyde.

9. The method for preparing an artistic coating capable of decomposing formaldehyde according to claim 8, characterized in that: The method for preparing the semi-fluid formaldehyde decomposition composition and the liquid formaldehyde decomposition composition by mixing with the base coating is the same as that for preparing the granular formaldehyde decomposition composition, wherein the mixing speed of the semi-fluid formaldehyde decomposition composition and the base coating is controlled at 600-700 rpm, and the mixing speed of the liquid formaldehyde decomposition composition and the base coating is controlled at 700-800 rpm.

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