Preparation method of foam-stabilizing particles and high-stable foaming coating slurry

Abstract

The present solution provides a method for preparing foam-stabilizing particles and a highly stable foaming coating slurry, comprising step S1: adding alkyl alkoxysilane to an inorganic nanoparticle dispersion, and stirring at room temperature for a certain period of time to obtain foam-stabilizing particles, wherein the foam-stabilizing particles are particles whose surfaces have been partially hydrophobically modified; step S2: adding a certain amount of inorganic filler particles, foam-stabilizing particles, a foam stabilizer, and a thickener to a polymer emulsion, adding ammonia water to adjust the pH value, and then adding a curing agent, and mixing uniformly to obtain a coating finishing working fluid; step S3: mechanically aerating and foaming the coating finishing working fluid, and obtaining a stable foaming coating slurry by controlling the liquid feed amount, stirring frequency, and air flow rate, wherein the foam-stabilizing particles replace part of the foam stabilizer to prepare a highly stable foaming coating slurry, thereby reducing the amount of surfactant used and reducing the effect of the processing temperature on foam stability, thereby improving the stability of the foaming coating slurry and the coating uniformity.

Description

Technical Field

[0001] The present invention relates to the technical field of new materials, and in particular to a method for preparing foam-stabilizing particles and a highly stable foaming coating slurry. Background Art

[0002] Fabric coating is the process of applying a layer of polymer or other material to the fabric to impart special functionality, thereby effectively increasing the fabric's added value. Common fabric coating methods include transfer coating, coagulation coating, and direct coating. Foam coating is a type of direct coating, characterized by low dye and chemical usage, low energy consumption, low processing costs, easy-to-control coating volume, and uniform coating. Foam coating mechanically foams the coating slurry by injecting bubbles, which increases the viscosity of the coating liquid, prevents the coating liquid from migrating on the fabric surface, resulting in uneven coating, and prevents the coating slurry from penetrating the front of the base fabric and affecting the fabric's appearance. It also gives the foam-coated fabric a softer feel, improving the quality of the coated fabric.

[0003] In terms of fabric foam coating processing, Chinese invention patent CN202411482209.6 mentions a flame-retardant sunshade foam coating fabric and its preparation method. Polyacrylate slurry and kerosene thickener are added to the phosphorus-nitrogen-silicon synergistic flame-retardant SiO2 aerogel particle dispersion to prepare a coating finishing liquid to prepare a flame-retardant sunshade foam coating fabric. The afterburning time and smoldering time are less than 2 s, and the damaged length is less than 5 cm, has good water resistance, and after washing 10 times, the flame retardant performance of the fabric has not decreased significantly; Chinese invention patent CN202410184196.8 mentions a processing method for a fiber-based sunshade material with automatic temperature regulation function: by preparing modified thermosensitive phase change microcapsules with high light-to-heat conversion efficiency and heat storage capacity, and applying them to the foaming coating, a processing method for a fiber-based sunshade material with light absorption and heat storage, low-temperature heat release and automatic temperature regulation functions is obtained; Chinese invention patent CN202411147903.2 relates to a shock-absorbing, heat-insulating and sound-absorbing TPU car seat cushion and its preparation method: using glass hollow microspheres as physical An epoxy resin-based micro-foaming coating with a foaming microporous source is applied to the surface of the hollow lattice support of the TPU seat cushion component. The coating formed after curing has a micro-foaming structure, which effectively improves the thermal insulation and sound absorption effect during vehicle operation. Chinese invention patent CN202411041111.7 introduces a foamed yarn and a preparation method thereof: a coating slurry is prepared with a foaming resin and heat-expandable microspheres, and after curing and foaming, a foaming coating composed of a flexible resin and elastic filler is formed on the yarn, which can improve the fluffiness and air permeability of the yarn. The cross-linking of the curing agent and the foaming resin in the foaming coating can improve the hydrolysis resistance and flexural resistance of the foaming coating. Although these processes all involve the processing of foaming coatings, the current process technology mainly focuses on how to make the foaming coating give the fabric good functionality to improve the product's fluffiness and air permeability, while there is less research on how to improve the stability of the foaming coating slurry and the uniformity of the coating.

[0004] During actual production and processing, a large amount of foam stabilizer is often added to the coating slurry to improve foam stability and prevent defoaming, which can affect the uniformity of the foamed coating. Chinese invention patent CN201410216595.4 describes a modified acrylic foaming coating emulsion and preparation method, using sodium dodecyl sulfate as the foam stabilizer at a weight ratio of 1-1.3. Chinese invention patent CN202411864020.3 reports a modified hemp core powder composite polyurethane foam material and preparation method, using silicone oil AK8805 as the foam stabilizer at a weight ratio of 1-2. While these surfactants provide excellent foam stability, their surface tension decreases at higher temperatures. Consequently, the actual amount of foam stabilizer required in these foaming coating slurries varies with temperature. The optimal amount of foam stabilizer is difficult to accurately control under different seasonal operating conditions, leading to variations in the quality and uniformity of the coating products.

[0005] In summary, how to conveniently and controllably improve the stability of the foaming coating slurry and the coating uniformity is still a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The object of the present invention is to provide a method for preparing foam-stabilizing particles and a highly stable foaming coating slurry. The method comprises preparing partially hydrophobic silica as foam-stabilizing particles by hyperbranching modification of polysiloxane. The foam-stabilizing particles replace part of the foam stabilizer to prepare a highly stable foaming coating slurry, thereby reducing the amount of surfactant used and reducing the effect of processing temperature on foam stability, thereby improving the stability of the foaming coating slurry and the coating uniformity.

[0007] To achieve the above objectives, the present technical solution provides a method for preparing foam-stabilizing particles, comprising the following steps: adding alkyl alkoxysilane to an inorganic nanoparticle dispersion, and obtaining foam-stabilizing particles after stirring at room temperature for a certain period of time, wherein the foam-stabilizing particles are particles whose surfaces are partially hydrophobically modified.

[0008] It should be noted that the foam-stabilizing particles provided in this solution are inorganic nanoparticles modified with alkylalkoxysilane, whose surfaces are partially hydrophobicized. These foam-stabilizing particles possess unique surface activity, good dispersibility, and excellent foam-stabilizing properties, making them suitable as a replacement for foam stabilizers in subsequent high-foaming coating slurries.

[0009] The surface activity of the foam-stabilizing particles is expressed according to the following formula I:

[0010]

[0011] in is the surface tension of water, θ is the water contact angle of the bubble-stabilizing particles, and r is the radius of the inorganic nanoparticles.

[0012] As can be seen from the above formula I, the particle size and degree of hydrophobic modification of the inorganic nanoparticles will affect the dispersibility of the foam-stabilizing particles in water, as well as the surface activity of the foam-stabilizing particles in water. Therefore, this scheme needs to select inorganic nanoparticles with appropriate particle size and control the amount of added alkylalkoxysilane to regulate the foam-stabilizing particles to have good dispersibility and surface activity.

[0013] In some embodiments, the inorganic nanoparticles have a particle size of 100 nm to 1 μm. This is because water has a high surface tension. Therefore, when the inorganic nanoparticles have a larger particle size (100 nm to 1 μm), the adsorption of some hydrophobically modified foam-stabilizing particles on the water surface becomes irreversible. Therefore, these foam-stabilizing particles are much more effective than organic surfactants in stabilizing foam and are less affected by temperature. However, when the inorganic nanoparticles exceed 1 μm in size, the foam's stability deteriorates due to gravity.

[0014] In some embodiments, 0.05% to 0.2% by mass of alkylalkoxysilane is added to the inorganic nanoparticle dispersion.

[0015] In some embodiments, the silane coupling agent modification is selected from the structural formula One or any combination of the silane monomers shown, wherein m is 1, 2 or 3, The general formula is C n H 2n-1 -a straight or branched chain alkyl group, n is any integer between 1 and 20, is methyl, ethyl, propyl or butyl.

[0016] The silane coupling agent of this scheme partially hydrophobically modifies the inorganic nanoparticles in the inorganic nanoparticle dispersion. The alkoxy group in the silane monomer reacts with the hydroxyl group on the surface of the inorganic nanoparticle to connect the silane monomer to the inorganic nanoparticle in a chemical bond. 1 It extends outward and forms a hydrophobic area on the surface of the inorganic nanoparticles. This hydrophobic modification changes the surface properties of the inorganic nanoparticles, making them surface active in water and able to irreversibly adsorb to the surface of bubbles, thereby stabilizing the bubbles.

[0017] In some embodiments, the inorganic nanoparticles are one or any combination of nano-silicon dioxide, nano-aluminum oxide, nano-titanium dioxide, and nano-zirconium dioxide.

[0018] In a specific embodiment, 0.025 parts of hexadecyltrimethoxysilane were added to the nano-silica dispersion in a constant temperature reactor at 25° C., mixed, and stirred for 48 hours to obtain the silica foam-stable particles.

[0019] In a second aspect, this solution provides a foam-stabilizing particle, comprising:

[0020] The surface of the inorganic nanoparticles is partially modified with alkylalkoxysilane, wherein the alkylalkoxysilane is connected to the inorganic nanoparticles by chemical bonds.

[0021] In some embodiments, the inorganic nanoparticles are one or any combination of nano-silicon dioxide, nano-aluminum oxide, nano-titanium dioxide, and nano-zirconium dioxide.

[0022] In some embodiments, the inorganic nanoparticles have a particle size of 100 nm to 1 μm.

[0023] In some embodiments, the alkylalkoxysilane is selected from the group consisting of One or any combination of the silane monomers shown, wherein m is 1, 2 or 3, The general formula is C n H 2n-1 -a straight or branched chain alkyl group, n is any integer between 1 and 20, is methyl, ethyl, propyl or butyl.

[0024] In some embodiments, the alkoxy groups of the alkylalkoxysilane react with the hydroxyl groups on the surface of the inorganic nanoparticles to be chemically bonded to the surface of the inorganic nanoparticles.

[0025] In a third aspect, the present invention provides a method for preparing a highly stable foaming coating slurry, comprising the following steps:

[0026] Step S1: adding alkylalkoxysilane to the inorganic nanoparticle dispersion and stirring at room temperature for a certain period of time to obtain stable foam particles, wherein the stable foam particles are particles obtained by partially hydrophobically modifying the surface of the inorganic nanoparticles;

[0027] Step S2: adding a certain amount of inorganic filler particles, foam stabilizing particles, foam stabilizer and thickener to the polymer emulsion, adding ammonia water to adjust the pH value, and then adding a curing agent, and mixing well to obtain a coating finishing working solution;

[0028] Step S3: mechanically aerate and foam the coating finishing working liquid, and obtain a stable foaming coating slurry by controlling the liquid feeding amount, stirring frequency and air flow.

[0029] This solution uses foam-stabilizing particles to replace traditional organic surfactants to achieve the stability of the foaming coating slurry. It aims to overcome the problem of different foam stability and poor coating uniformity caused by different surface tensions of foam stabilizers in traditional foaming coating slurries at different temperatures, thereby ensuring the consistency of the coating processing technology and the stability of the quality of different batches of products.

[0030] For the relevant technical features of step S1, please refer to the introduction of the first aspect and will not be described here in detail.

[0031] In step S2, the polymer emulsion is one or more of polyurethane, polyvinyl acetate, polystyrene, polyacrylate, or copolymer emulsions thereof. These polymer emulsions possess excellent film-forming properties, adhesion, and chemical resistance, meeting the diverse requirements of highly stable foaming coating slurries in textile coating processes. Specifically, after drying, these polymer emulsions form a continuous, uniform film that effectively coats the textile surface for both protection and decoration. They also exhibit excellent adhesion to textiles and other additives (such as filler particles and foam-stabilizing particles).

[0032] In step S2, the inorganic filler particles are one or more of titanium dioxide, zinc oxide, aluminum oxide, zirconium dioxide, etc. The addition of the inorganic filler particles is mainly used to improve the covering and light-shielding properties of the foaming coating slurry.

[0033] In step S2, the foam stabilizer is one or more of sodium lauryl sulfate, sodium stearate, etc. It should be noted that the foam stabilizing particles of this solution can replace most foam stabilizers to improve the foaming stability of the foaming coating slurry.

[0034] In some embodiments, the thickener is one of an aqueous alkali swellable thickener and a polyacrylate polymer thickener to increase the viscosity of the foaming coating slurry.

[0035] In some embodiments, aqueous ammonia is added to adjust the pH to 8.5-10.

[0036] In some embodiments, the curing agent is an isocyanate curing agent or an epoxy curing agent.

[0037] In some embodiments, 40-60 parts of the polymer emulsion contain 20-35 parts of inorganic filler particles, 1-3 parts of foam stabilizing particles, 0.1-0.3 parts of a foam stabilizer, 1-2 parts of a thickener, and 9-14 parts of a curing agent.

[0038] In some embodiments, a polymer emulsion, inorganic filler particles, foam stabilizing particles, a foam stabilizer, and a thickener are mixed in a constant temperature reactor of an ultrasonic emulsification rod, and ammonia water is added to adjust the pH value before adding a curing agent. After the ultrasonic emulsification rod is turned on for emulsification for a period of time, the ultrasonic emulsification rod is turned off to obtain a coating finishing working fluid.

[0039] In some specific embodiments, 50 parts of a polymethyl acrylate polymer emulsion with a solid content of 40%, 28 parts of rutile titanium dioxide, 3 parts of foam-stabilizing particles, 0.2 parts of sodium lauryl sulfate, 2 parts of an acrylic acid kerosene polymer thickener, and 10 parts of an isocyanate curing agent are used.

[0040] In step S3, gas is introduced into the coating finishing working liquid through mechanical stirring or aeration, and a large number of tiny bubbles are formed in the emulsion of the coating finishing working liquid. The introduction of bubbles can significantly change the physical properties of the emulsion, such as density, viscosity, permeability and fluidity. An appropriate amount of surfactant and foam stabilizer can ensure that the formed foam is stable and not easy to break. After the emulsion is foamed, the viscosity of the foam slurry increases and its permeability to the fabric decreases, thereby avoiding the infiltration and migration of the coating slurry and avoiding the problems of uneven coating and contamination.

[0041] In some embodiments, the amount of coating slurry foamed is 100 parts, the stirring frequency is 300-1000 r / min, the air flow of the bubbler is 100-400 parts, and the aeration time is 10-60 min.

[0042] In some specific embodiments, the coating slurry foaming liquid dosage is 100 parts, the stirring frequency is 500 r / min, the bubbler air flow rate is 300 parts, the liquid dosage and air flow rate ratio is 1:3, and the aeration time is 30 min.

[0043] Fourthly, this solution provides a highly stable foaming coating slurry, which is prepared by the preparation method of the highly stable foaming coating slurry mentioned in the third aspect. It has the characteristics of fine, uniform, and stable foaming, and the foaming performance is not affected by seasonal temperature. The foaming multiple can reach up to 400%, the amount of foam stabilizer is reduced by 90%, and the half-dissipation time is greater than 12 hours, which is superior to the traditional foaming coating slurry using foam stabilizers.

[0044] In some embodiments, the highly stable foaming coating slurry provided by this solution is applied in the field of textile coating processing.

[0045] Compared with the existing technology, this technical solution has the following characteristics and beneficial effects:

[0046] This scheme prepares partially hydrophobically modified inorganic nanoparticles by adding alkylalkoxysilane to an inorganic nanoparticle dispersion. Using these partially hydrophobically modified inorganic nanoparticles instead of foam stabilizers reduces the amount of surfactant used and the effect of processing temperature on foam stability. This improves the foam stability of the foaming coating slurry and the uniformity of the coating on the fabric surface. The coating formulation remains stable with seasonal temperature fluctuations, ensuring consistent coating processing and consistent product quality across batches. This improves the foam stability of the foaming coating slurry and the uniformity of the fabric surface coating, making it suitable for foam coating finishing on fabric surfaces. The prepared coating slurry exhibits fine, uniform, and highly stable foams, and its foaming performance is unaffected by seasonal temperature. The foaming multiple can reach up to 400%, while reducing the amount of foam stabilizer by 90% and extending the half-life (greater than 12 hours), surpassing conventional foaming coating slurries using foam stabilizers (half-life time approximately 2 hours). BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 1 is the particle size distribution of the silicon dioxide nanoparticles prepared in Example 1 before and after modification.

[0048] Figure 2 This is a SEM morphology of the coating surface prepared in Example 1.

[0049] Figure 3 This is a three-dimensional image of the coating surface prepared in Example 1. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0051] Example 1: A method for preparing a highly stable foaming coating slurry according to this embodiment comprises the following steps:

[0052] Step (1): Preparation of silica foam-stabilized particles: 0.25 mL of hexadecyltrimethoxysilane was added to an aqueous dispersion of silica particles with an average particle size of 100 nm (containing 15 g of silica), and the mixture was stirred at room temperature for 48 h to obtain a mixed solution. The mixed solution was centrifuged at a speed of 11,000 r / min for 30 min, and the centrifuged particles were washed three times with water to obtain silica foam-stabilized particles.

[0053] Step (2): Preparation of coating finishing working fluid: add 28 g of rutile titanium dioxide, 3 g of silica foam-stabilizing particles, 0.2 g of sodium lauryl sulfate and 2 g of acrylic acid kerosene polymer thickener to 50 g of methyl acrylate emulsion with a solid content of 40%, add 0.3 g of ammonia water to adjust the pH value, add 10 g of isocyanate curing agent, and mix the above components evenly to obtain the coating finishing working fluid.

[0054] Step (3): Preparation of high-stable foaming coating slurry: 50 mL coating finishing working liquid, stirring frequency of 500 r / min, bubbler air flow of 150 mL, control the ratio of liquid supply and air flow to be 1:3, and aeration time of 30 min.

[0055] Dynamic Light Scattering (DLS) Measurements:

[0056] The silica particles before and after hydrophobic modification were diluted with water to 1.5 wt‰, and the pH value of the solution was adjusted to 9. The particle size of the silica particles was measured using a Malvern Zetasizer Nano Series dynamic light scattering instrument at a scattering angle of 147° at 25°C. The test results are shown in Figure 2. Figure 1 As shown in the figure, the dynamic light scattering particle size of the unmodified silica particles is 100 nm, while the particle size of the modified silica particles increases to 120 nm, indicating that the particles do not aggregate in the dispersion after hydrophobic modification.

[0057] Determination of half defoaming time of coating slurry:

[0058] Add 20 mL of the coating slurry to a 100 mL graduated cylinder and introduce air at a liquid to air flow ratio of 1:3. Record the maximum foam height. Let the foamed slurry stand, record the foam height at regular intervals, and measure the time it takes for the foam to break halfway. The half-break time of the foamed coating slurry prepared in Example 1 was 11.6 h.

[0059] Coating uniformity test: The prepared foam coating slurry is scraped on the cloth surface, and the coating is dried after preparation, and the uniformity of the coating is measured. The surface morphology of the coating is observed using a scanning electron microscope. Figure 2 The three-dimensional image and height profile of the coating surface were obtained using a confocal laser scanning microscope (CLSM, KEYENCE VK-X150, Japan). Three scans were performed on different areas to calculate the average roughness (Sa). The results are shown in Figure 3 .from Figure 3 It can be seen that the average roughness S of the coating a The value is 2.12 μm, indicating that the coating surface has high flatness and good uniformity.

[0060] Example 2: A method for preparing a highly stable foaming coating slurry according to this embodiment comprises the following steps:

[0061] 2 g of the silica foam-stabilizing particles prepared in Example 1 were dispersed in 40 g of butyl acrylate emulsion with a solid content of 40%, 20 g of anatase titanium dioxide, 0.3 g of sodium lauryl sulfate, and 3 g of an acrylic acid kerosene polymer thickener were added, an appropriate amount of ammonia was added to adjust the pH to 9, 8 g of an isocyanate curing agent was added, and the above components were mixed uniformly to obtain a coating finishing working solution.

[0062] Prepare high-stable foaming coating slurry: 40 mL of coating finishing working liquid, stirring frequency of 400 r / min, air flow of the bubbler of 160 mL, control the ratio of liquid feed and air flow to be 1:4, aeration time of 60 min, and obtain high-stable foaming coating slurry.

[0063] After testing, the half-defoaming time of the prepared foaming coating slurry was 12.3 h. Referring to Example 1, the foaming coating slurry was used to prepare a fabric coating by blade coating. The average roughness of the obtained coating was S a The value is 1.98 μm.

[0064] Example 3: A method for preparing a highly stable foaming coating slurry according to this embodiment comprises the following steps:

[0065] Step (1): Preparation of alumina foam-stabilized particles: 30 mL of hexadecyltrimethoxysilane was added to a dispersion of alumina particles with an average particle size of 250 nm (containing 1.6 kg of alumina), and the mixture was stirred and reacted at room temperature for 48 h; the mixture was centrifuged for 30 min, and the centrifuged particles were washed three times with water to obtain alumina foam-stabilized particles.

[0066] Step (2): Preparation of coating finishing working fluid: 50 kg of butyl acrylate and 15 kg of methyl acrylate emulsion are mixed, and then 30 kg of anatase titanium dioxide is added, and after stirring and mixing evenly, 2 kg of the prepared alumina foam-stabilizing particles and 0.2 kg of sodium lauryl sulfate are added, and after stirring and mixing, 1 kg of acrylic acid kerosene polymer thickener is added, 0.2 kg of ammonia water is added to adjust the pH value, and an appropriate amount of isocyanate curing agent is added. After the above components are mixed evenly, a coating finishing working fluid is obtained.

[0067] Step (3): Preparation of high-stable foaming coating slurry: The coating finishing working solution prepared above was stirred evenly at a rate of 500 r / min, and stirred while aerating at a ratio of 1:3 for 30 minutes to obtain a high-stable foaming coating slurry.

[0068] After testing, the half-defoaming time of the prepared foaming coating slurry was 14.6 h. Referring to Example 1, the foaming coating slurry was used to prepare a fabric coating by blade coating. The average roughness of the obtained coating was S a The value is 2.31 μm.

[0069] Example 4: A method for preparing a highly stable foaming coating slurry according to this embodiment comprises the following steps:

[0070] Step (1): Preparation of titanium dioxide foam-stable particles: 32 mL of hexadecyltrimethoxysilane was added to a titanium dioxide dispersion (containing 1.5 kg of titanium dioxide) with an average particle size of 310 nm, and the mixture was stirred at room temperature for 36 h. The mixture was centrifuged at a speed of 12,000 r / min for 30 min, and the centrifuged particles were washed three times with water to obtain titanium dioxide foam-stable particles.

[0071] Step (2): Preparation of coating finishing working fluid: 30 kg of rutile titanium dioxide, 1.5 kg of titanium dioxide foam-stabilizing particles, 0.5 kg of sodium lauryl sulfate and 3.5 kg of acrylic acid kerosene polymer thickener were added to a mixed emulsion of 42 kg of butyl acrylate emulsion with a solid content of 40% and 22 kg of methyl acrylate, the pH value was adjusted to 9 with aqueous ammonia, 8 kg of isocyanate curing agent was added, and the above components were mixed uniformly to obtain a coating finishing working fluid.

[0072] Step (3): Preparation of high-stable foaming coating slurry: The coating finishing working solution prepared above is stirred evenly at a rate of 800 r / min, and stirred while aerating at a ratio of 1:2 for 40 minutes to obtain a high-stable foaming coating slurry.

[0073] After testing, the half-defoaming time of the prepared foaming coating slurry was 12.5 h. Referring to Example 1, the foaming coating slurry was used to prepare a fabric coating by blade coating. The average roughness of the obtained coating was S a The value is 1.88 μm.

[0074] Example 5: A method for preparing a highly stable foaming coating slurry according to this embodiment comprises the following steps:

[0075] The titanium dioxide foam-stabilizing particles prepared according to Example 4 were used to prepare the coating working solution.

[0076] Preparation of coating finishing working fluid: Add 25 kg of anatase titanium dioxide, 2.6 kg of titanium dioxide foam-stabilizing particles, 0.25 kg of sodium lauryl sulfate and 1.5 kg of acrylic acid kerosene polymer thickener to a mixed emulsion of 50 kg of butyl acrylate emulsion with a solid content of 40% and 19 kg of methyl acrylate, adjust the pH value to 9 with ammonia water, add 8.6 kg of isocyanate curing agent, and mix the above components evenly to obtain the coating finishing working fluid.

[0077] Step (3): Preparation of high-stable foaming coating slurry: The coating finishing working solution prepared above was stirred evenly at a rate of 600 r / min, and stirred for 15 minutes while aerating according to a ratio of 1:4 to obtain a high-stable foaming coating slurry.

[0078] After testing, the half-defoaming time of the prepared foaming coating slurry was 13.3 h. Referring to Example 1, the foaming coating slurry was used to prepare a fabric coating by blade coating. The average roughness of the obtained coating was S a The value is 2.42 μm.

[0079] Comparative Example 1: A method for preparing a high-stable foaming coating slurry according to this embodiment, comprising the following steps:

[0080] In this comparative example, sodium lauryl sulfate is used as a foam stabilizer, and no inorganic nano foam stabilizing particles are added. Other than this, the preparation formula and foaming process of the coating working fluid are consistent with those of Example 4.

[0081] After testing, the half-defoaming time of the prepared foam coating slurry was 2 h. Referring to Example 1, the foam coating slurry was used to prepare a fabric coating by blade coating. The average roughness of the obtained coating was S a The value is 3.82 μm.

[0082] Comparative Example 2: A method for preparing a high-stable foaming coating slurry according to this embodiment, comprising the following steps:

[0083] In this comparative example, sodium stearate is used as a foam stabilizer, and no inorganic nano foam stabilizing particles are added. Apart from this, the preparation formula and foaming process of the coating working fluid are consistent with those of Example 5.

[0084] After testing, the half-defoaming time of the prepared foaming coating slurry was 2.4 h. Referring to Example 1, the foaming coating slurry was used to prepare a fabric coating by blade coating. The average roughness of the obtained coating was S a The value is 4.22 μm.

[0085] Those skilled in the art should understand that the technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above embodiments merely illustrate several embodiments of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for preparing a high-stable foaming coating slurry, characterized in that: The following steps are involved: Step S1: adding alkylalkoxysilane to an inorganic nanoparticle dispersion, and stirring at room temperature for a certain period of time to obtain stable foam particles, wherein the stable foam particles are particles whose surfaces are partially hydrophobically modified, and the particle size of the inorganic nanoparticles is 100 nm to 1 μm; Step S2: adding a certain amount of inorganic filler particles, foam stabilizing particles, foam stabilizer and thickener to the polymer emulsion, adding ammonia water to adjust the pH value, and then adding a curing agent, mixing well to obtain a coating finishing working solution, wherein the foam stabilizer is one or more of sodium lauryl sulfate and sodium stearate, and 20-35 parts of inorganic filler particles, 1-3 parts of foam stabilizing particles, 0.1-0.3 parts of foam stabilizer, 1-2 parts of thickener and 9-14 parts of curing agent are added to 40-60 parts of polymer emulsion; Step S3: mechanically aerate and foam the coating finishing working liquid, and obtain a stable foaming coating slurry by controlling the liquid feeding amount, stirring frequency and air flow.

2. The method for preparing the high-stable foaming coating slurry according to claim 1, wherein: 0.01-0.04 parts of alkylalkoxysilane are added to the inorganic nanoparticle dispersion.

3. The method for preparing the high-stable foaming coating slurry according to claim 1, wherein: Alkylalkoxysilane is selected from the structural formula R 1 4-m Si(OR 2 ) m One or any combination of the silane monomers shown, wherein m is 1, 2 or 3, The general formula is C n H 2n+1 A straight chain or branched alkyl group, n is any integer between 1 and 20, is methyl, ethyl, propyl or butyl.

4. The method for preparing the high-stable foaming coating slurry according to claim 1, wherein: The inorganic nanoparticles are any combination of nano silicon dioxide, nano aluminum oxide, nano titanium dioxide and nano zirconium dioxide.

5. The method for preparing the high-stable foaming coating slurry according to claim 1, characterized in that: The polymer emulsion is one or more of polyurethane, polyvinyl acetate, polystyrene, polyacrylate or copolymer emulsions thereof.

6. The method for preparing the high-stable foaming coating slurry according to claim 1, characterized in that: The high-stable foaming coating slurry is applied in the field of textile coating processing.

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