Silica sol composite coating and preparation process thereof

Abstract

The invention provides a silica sol composite coating and a preparation process thereof, and belongs to the technical field of silica sol composite coatings. Comprises: 10 parts of silica sol; 2 parts of a silane coupling agent organic solution; 2-3 parts of silicate; 0.5 to 1 part of ethylene vinyl acetate emulsion; 0.6 to 0.8 part of styrene-acrylic acid emulsion; 1-1.5 parts of pigment and filler; 0.7 to 0.9 part of an auxiliary agent; the preparation method comprises the following steps: S1, preparing raw materials, namely preparing silica sol, namely selecting the silica sol with stable performance and excellent quality as a base material; s2, proportioning and mixing: accurately weighing various raw materials according to formula requirements; s3, grinding and dispersing; s4, adjusting and filtering: adjusting performance indexes of viscosity, color and pH value of the coating according to requirements; and S5, packaging and storing. According to the silica sol coating, a reasonable preparation method is adopted, important links are controlled within the range meeting requirements, it is ensured that the quality and performance of the coating meet the requirements, it can be ensured that the preparation value of the coating is always kept within the specified range, and the production and use requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of silica sol composite coatings, and particularly relates to a silica sol composite coating and a preparation process thereof. Background Art

[0002] The silica sol composite coating is a coating with excellent performance. Its preparation process and formulation design have a crucial impact on the performance of the coating. The silica sol composite coating is mainly composed of silica sol, polymer emulsion, and other additives (such as pigments, fillers, and auxiliaries). Silica sol is a colloidal substance formed by the hydrolysis and polymerization of silicate or silicate acidic solution under certain conditions, and has excellent film-forming property, wear resistance, weather resistance, etc. The polymer emulsion provides the flexibility, adhesion, and water resistance of the coating, etc. Through scientific formulation design and fine process control, a silica sol composite coating with excellent performance can be prepared. For the coatings of the prior art, after construction, color difference is relatively easy to form, cracks and voids are formed inside, the preparation process is relatively complex, the service life of the paint surface is reduced, and it cannot match the service life of the building. Therefore, the present application provides a silica sol composite coating and a preparation process to meet the requirements. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a silica sol composite coating and a preparation process to solve the problems that the existing preparation process is relatively complex, the service life of the paint surface is reduced, and it cannot match the service life of the building.

[0004] To solve the above technical problems, the present invention provides the following technical solutions:

[0005] A silica sol composite coating and a preparation process thereof, which are composed of the following components, including:

[0006] Silica sol: 10 parts;

[0007] Organic solution of silane coupling agent: 2 parts;

[0008] Silicate: 2 - 3 parts;

[0009] Ethylene vinyl acetate emulsion: 0.5 - 1 part;

[0010] Styrene - acrylic emulsion: 0.6 - 0.8 part;

[0011] Pigment and filler: 1 - 1.5 parts;

[0012] Auxiliary: 0.7 - 0.9 part;

[0013] Silane coupling agent: 0.3 - 0.5.

[0014] A preparation process of a silica sol composite coating, including the following steps:

[0015] S1. Raw material preparation: For silica sol, select silica sol with stable performance and excellent quality as the base material;

[0016] For polymer emulsion, select a suitable polymer emulsion according to the performance requirements of the coating, such as ethylene vinyl acetate emulsion, styrene-acrylic emulsion;

[0017] For pigments and fillers, select appropriate pigments and fillers to improve the hiding power and decorative properties of the coating, which can be one or more of titanium dioxide, heavy calcium carbonate, and talc powder;

[0018] For additives, it can be one or more of dispersants, thickeners, defoamers, and wetting agents, which are used to improve the processing performance and construction performance of the coating;

[0019] Silane coupling agent (used to enhance the adhesion between the coating and the base material), phosphoric acid (used for sterilization);

[0020] S2. Batching and mixing: Weigh various raw materials accurately according to the formula requirements;

[0021] Under stirring conditions, add silica sol, polymer emulsion, pigments and fillers, and additives into the mixing container in sequence, and stir well;

[0022] S3. Grinding and dispersion: Feed the mixed coating into the grinding equipment for grinding and dispersion to improve the dispersion degree of pigments and fillers and the fineness of the coating;

[0023] S4. Adjustment and filtration: Adjust the performance indexes of the viscosity, color, and pH value of the coating according to needs;

[0024] Remove impurities and particles in the coating through the filtration equipment to ensure the quality of the coating;

[0025] S5. Packaging and storage: Package the prepared coating and store it in a cool, dry, and ventilated place, avoiding direct sunlight and high temperature.

[0026] Optionally, in S4, the pH value of the mixed coating is detected. The pH value of the coating is controlled within the weak alkaline range, which can be 8.5 - 10.0. The pH value of the coating is adjusted by adding an appropriate amount of ammonia water. Other more excellent coating additives can also be selected to adjust the pH value;

[0027] The pH value of the silica sol composite coating is usually detected using a precision pH meter. Compare the measured pH value with the specified standard range (8.5 - 10.0). If the measured value is within this range, it indicates that the pH value of the coating meets the standard. In addition to directly measuring the pH value, the pH value of the coating can also be judged by observing the performance of the coating.

[0028] Optionally, in S1, the particle size of the silica sol particles needs to be pre-screened. The particle size range of the silica sol particles is between 5 and 100 nm. Titrate the content of silanol groups on the surface of the silica sol particles with a standard sodium hydroxide solution, and calculate the particle size of the silica sol according to the empirical formula. The measurement result is close to that of the electron microscopy method (such as TEM).

[0029] Or analyze the particle size of the silica sol by the spatial distribution (scattering spectrum) of the diffracted or scattered light of the silica sol particles.

[0030] The particle size and uniformity of the silica sol can also be directly observed by transmission electron microscopy (TEM) or scanning electron microscopy (SEM).

[0031] Optionally, in S3, under low-speed stirring, preliminarily disperse the mixed coating to ensure the uniform distribution of each component. During the grinding process, regularly detect the fineness of the coating to ensure that it reaches the required fineness range, at least below 20 μm.

[0032] In S4, according to the characteristics of the coating and the required filtration accuracy, select a suitable filtration device, such as filter cloth, filter screen or filter. Pour the coating into the filtration device, and remove the impurity particles and particulate matter in the coating through the filtration medium. During the filtration process, it is necessary to keep the filtration device clean and unobstructed to avoid blockage and affect the filtration effect. After filtration, it is necessary to detect the clarity and impurity content of the coating to ensure that the required quality standard is reached.

[0033] Optionally, in S4, understand the customer's color requirements, including the required color number, hue, lightness and saturation. Combine the coating color matching experience and color theory to formulate a color formula. According to the color formula, select suitable pigments, and use precise weighing equipment to weigh. Mix the weighed pigments with the coating base material, and use color mixing equipment to mix. During the mixing process, it is necessary to continuously detect the color and make necessary corrections to ensure that the color meets the customer's requirements.

[0034] Optionally, determine the required viscosity range, select a suitable viscosity regulator, such as thickener or diluent. Add the viscosity regulator to the coating, and use a viscometer to test the viscosity. According to the test results, adjust the dosage of the viscosity regulator until the required viscosity range is reached.

[0035] Optionally, in S5, the sol composite coating should be stored in a dry, cool and well-ventilated warehouse, avoiding direct sunlight and high temperature. The temperature of the storage environment should be controlled between 5 and 40 degrees Celsius, and the humidity should be moderate to avoid the coating from getting damp or deteriorating. Regularly check the stored coating to ensure that the packaging is intact and there is no leakage, and check the performance parameters such as the appearance, viscosity and color of the coating.

[0036] Optionally, in S5, a sealing machine is used to seal the package, and a label printer is used to print labels and attach them to the package, indicating the name, specifications, production date, and expiration date information of the coating.

[0037] Compared with the prior art, the present invention has at least the following beneficial effects:

[0038] In the above solution, in the preparation process of the silica sol composite coating, performance parameters such as the color and viscosity of the coating are adjusted according to customer requirements, as well as subsequent packaging and storage, which involve a series of specific steps and process equipment. Through precise formulation and strict packaging and storage management, the quality and performance of the coating can be ensured to meet customer requirements. The silica sol coating adopts a reasonable preparation method, and important links are controlled within the required range to ensure that the quality and performance of the coating meet the requirements. Through reasonable control methods and accurate detection methods, the preparation values of the coating can be ensured to always remain within the specified range, thus meeting the production and use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention and, together with the specification, are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0040] Figure 1 is a schematic process flow diagram for the preparation of the silica sol composite coating;

[0041] Figure 2 is a schematic diagram for detecting the pH value of the coating;

[0042] Figure 3 is a schematic diagram for screening silica sol particles;

[0043] Figure 4 is a schematic process flow diagram for filtering the coating;

[0044] Figure 5 is a schematic process flow diagram for adjusting the color of the coating;

[0045] As shown in the figure, in order to clearly show the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present invention to this specific structure, device, and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The following will combine the accompanying drawings and specific embodiments to describe in detail a silica sol composite coating and its preparation process provided by the present invention. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the drawing part is only for more specifically describing the embodiments and is not intended to specifically limit the present invention.

[0047] It should be noted that in the specification, references to "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Additionally, when combining embodiments to describe specific features, structures, or characteristics, implementing such features, structures, or characteristics in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0048] Generally, terms can be understood at least in part from their use in context. For example, at least in part depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather can alternatively, at least in part depending on the context, allow for the existence of other factors that may not be explicitly described.

[0049] It can be understood that the meanings of "on...", "above...", and "over..." in the present invention should be interpreted in the broadest manner, such that "on..." not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above..." or "over..." not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0050] Furthermore, spatial relative terms such as "under...", "below...", "lower", "above...", "upper", etc. are used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the drawings. Spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the drawings. The device can be oriented in other ways, and the spatial relative descriptive terms used herein can be similarly interpreted accordingly.

[0051] As Figures 1 - 5 shown, the embodiments of the present invention provide a silica sol composite coating, which is composed of the following components, including:

[0052] Silica sol: 10 parts;

[0053] Organic solution of silane coupling agent: 2 parts;

[0054] Silicate: 2 - 3 parts;

[0055] Ethylene vinyl acetate emulsion: 0.5 - 1 part;

[0056] Styrene - acrylic emulsion: 0.6 - 0.8 part;

[0057] Pigment and filler: 1 - 1.5 parts;

[0058] Auxiliary agent: 0.7 - 0.9 part;

[0059] Silane coupling agent: 0.3 - 0.5.

[0060] A preparation process of a silica sol composite coating, comprising the following steps:

[0061] S1. Raw material preparation, silica sol: Select a silica sol with stable performance and excellent quality as the base material;

[0062] Polymer emulsion: Select a suitable polymer emulsion according to the coating performance requirements, such as ethylene vinyl acetate emulsion, styrene - acrylic emulsion;

[0063] Pigment and filler: Select appropriate pigment and filler to improve the covering power and decoration of the coating, which can be one or more of titanium dioxide, heavy calcium, and talc powder;

[0064] Auxiliary agent: It can be one or more of a dispersant, thickener, defoamer, and wetting agent, which are used to improve the processing performance and construction performance of the coating;

[0065] Silane coupling agent (used to enhance the adhesion between the coating and the base material), phosphoric acid (used for sterilization);

[0066] S2. Batching and mixing, accurately weigh various raw materials according to the formula requirements;

[0067] Under stirring conditions, add silica sol, polymer emulsion, pigment and filler, and auxiliary agent into the mixing container in sequence, and stir evenly;

[0068] S3. Grinding and dispersion, send the mixed coating into the grinding equipment for grinding and dispersion to improve the dispersion degree of the pigment and filler and the fineness of the coating;

[0069] S4. Adjustment and filtration, adjust the performance indexes of the viscosity, color, and pH value of the coating as needed;

[0070] Remove impurities and particles in the coating through the filtration equipment to ensure the quality of the coating;

[0071] S5, Packaging and storage: Package the prepared coating and store it in a cool, dry, and well-ventilated place, avoiding direct sunlight and high temperatures.

[0072] In S4, the pH value of the mixed coating is detected. The pH value of the coating is controlled within the weakly alkaline range, which can be 8.5 - 10.0. Adjust the pH value of the coating by adding an appropriate amount of ammonia water. Other more excellent coating additives can also be selected to adjust the pH value.

[0073] The pH value of the silica sol composite coating is usually detected using a precision pH meter. Compare the measured pH value with the specified standard range (8.5 - 10.0). If the measured value is within this range, it indicates that the pH value of the coating meets the standard. In addition to directly measuring the pH value, the pH value can also be judged by observing the performance of the coating.

[0074] In S1, the particle size of the silica sol particles needs to be pre-screened. The particle size range of the silica sol particles is between 5 - 100 nm. Titrate the content of silanol groups on the surface of the silica sol particles with a standard sodium hydroxide solution, and calculate the particle size of the silica sol according to the empirical formula. The measurement result is close to the result of the electron microscopy method (such as TEM).

[0075] Or analyze the particle size of the silica sol by the spatial distribution of the diffracted or scattered light of the silica sol particles (scattering spectrum).

[0076] The particle size and uniformity of the silica sol can also be directly observed using a transmission electron microscope (TEM) or a scanning electron microscope (SEM).

[0077] In S3, under low-speed stirring, the mixed coating is preliminarily dispersed to ensure the uniform distribution of each component. During the grinding process, it is necessary to regularly detect the fineness of the coating to ensure that it reaches the required fineness range, at least below 20 μm.

[0078] In S4, select a suitable filtering device according to the characteristics of the coating and the required filtering accuracy, such as filter cloth, filter screen, or filter. Pour the coating into the filtering device, and remove the impurity particles and particulate matters in the coating through the filtering medium. During the filtering process, it is necessary to keep the filtering device clean and unobstructed to avoid blockage and affect the filtering effect. After filtering, it is necessary to detect the clarity and impurity content of the coating to ensure that it meets the required quality standards.

[0079] In S4, understand the customer's color requirements, including the required color number, hue, lightness, and saturation. Combine the color mixing experience of the paint and color theory to formulate a color formula. According to the color formula, select appropriate pigments and use precise weighing equipment for weighing. Mix the weighed pigments with the paint base and use color mixing equipment for mixing. During the mixing process, continuously detect the color and make necessary corrections to ensure the color meets the customer's requirements.

[0080] Determine the required viscosity range, select appropriate viscosity regulators such as thickeners or diluents, add the viscosity regulator to the paint, and use a viscometer for viscosity testing. According to the test results, adjust the dosage of the viscosity regulator until the required viscosity range is reached.

[0081] In S5, the sol composite paint should be stored in a dry, cool, and well-ventilated warehouse, avoiding direct sunlight and high temperatures. The temperature of the storage environment should be controlled between 5 and 40 degrees Celsius, and the humidity should be moderate to prevent the paint from getting damp or deteriorating. Regularly check the stored paint to ensure the packaging is intact and there is no leakage, and check the performance parameters such as the appearance, viscosity, and color of the paint.

[0082] In S5, use a sealing machine to seal the packaging and use a label printer to print labels and attach them to the packaging, indicating the name, specification, production date, and expiration date information of the paint.

[0083] This invention covers any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To enable the public to have a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments of this invention. However, those skilled in the art can fully understand this invention even without the description of these details. Additionally, to avoid unnecessary confusion to the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0084] The above are only the preferred embodiments of this invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of this invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of this invention.

Claims

1. A silica sol composite coating, characterized in that: It is composed of the following components, including: Silica sol: 10 parts; Silane coupling agent organic solution: 2 parts; 2-3 parts of silicate; 0.5-1 part of ethylene vinyl acetate emulsion; Styrene-acrylic emulsion 0.6-0.8 parts; 1-1.5 parts of pigment and filler; Additives 0.7-0.9 parts; Silane coupling agent 0.3-05.

2. A process for preparing a silica sol composite coating, which is applicable to the silica sol composite coating according to claim 1, characterized in that: The following steps are involved: S1. Raw material preparation, silica sol: Select silica sol with stable performance and good quality as the base material; Polymer emulsion: Select appropriate polymer emulsion according to coating performance requirements, such as ethylene vinyl acetate emulsion and styrene-acrylic emulsion; Pigments and fillers: Choose appropriate pigments and fillers to improve the hiding power and decorative properties of the paint. One or more of titanium dioxide, heavy calcium, and talcum powder can be selected; Auxiliary agent: can be one or more of dispersant, thickener, defoamer, wetting agent; Silane coupling agent (used to enhance the adhesion between the coating and the substrate), phosphoric acid (used for sterilization); S2, batching and mixing, accurately weigh various raw materials according to the formula requirements; Under stirring conditions, add silica sol, polymer emulsion, pigments and fillers and additives into the mixing container in sequence and stir thoroughly; S3, grinding and dispersing, sending the mixed paint into the grinding equipment for grinding and dispersing, improving the dispersion of pigments and fillers and the fineness of the paint; S4, adjustment and filtration, adjust the performance indicators of the coating such as viscosity, color and pH value as needed; Remove impurities and particles from the paint through filtering equipment to ensure the quality of the paint; S5. Packaging and storage: Package the prepared coating and store it in a cool, dry, ventilated place, avoiding direct sunlight and high temperature.

3. The preparation process of the silica sol composite coating according to claim 2, characterized in that: In S4, the mixed coating is tested for pH value, and the pH value of the coating is controlled within the weak alkaline range, which can be 8.5-10.

0. The pH value of the coating is adjusted by adding an appropriate amount of ammonia water, and other more excellent coating additives can also be selected to adjust the pH value; The pH value of silica sol composite coatings is usually tested using a precision pH meter. The measured pH value is compared with the specified standard range (8.5~10.0). If the measured value is within this range, it means that the pH value of the coating meets the standard. In addition to directly measuring the pH value, the performance of the coating can also be observed to determine whether its pH value meets the standard.

4. The preparation process of the silica sol composite coating according to claim 2, characterized in that: In S1, the particle size of silica sol particles needs to be pre-screened. The particle size of silica sol particles ranges from 5 to 100 nm. The content of silanol groups on the surface of silica sol particles is titrated with sodium hydroxide standard solution. The particle size of silica sol is calculated according to the empirical formula. The measurement result is close to the result of electron microscopy (such as TEM). Or analyze the size of silica sol particles through the diffraction or spatial distribution of scattered light (scattering spectrum) of silica sol particles; The size and uniformity of the silica sol particles can also be directly observed using a transmission electron microscope (TEM) or a scanning electron microscope (SEM).

5. The preparation process of the silica sol composite coating according to claim 2, characterized in that: In S3, the mixed coating is preliminarily dispersed under low-speed stirring to ensure that the components are evenly distributed. During the grinding process, the fineness of the coating needs to be regularly tested to ensure that the required fineness range is reached, at least below 20 μm.

6. The preparation process of the silica sol composite coating according to claim 2, characterized in that: In S3 and S4, according to the characteristics of the paint and the required filtering accuracy, select appropriate filtering equipment, such as filter cloth, filter screen or filter, pour the paint into the filtering equipment, and remove the foreign particles and particulate matter in the paint through the filtering medium. During the filtering process, the filtering equipment needs to be kept clean and unobstructed to avoid blockage and affect the filtering effect. After filtering, the clarity and impurity content of the paint need to be tested.

7. The preparation process of the silica sol composite coating according to claim 2, characterized in that: In S4, we understand the customer's color needs, including the required color number, hue, lightness and saturation, and formulate a color formula based on the paint color mixing experience and color theory. According to the color formula, we select the appropriate pigment and use precise weighing equipment to weigh it. The weighed pigment is mixed with the paint base material and mixed with color mixing equipment. During the mixing process, the color needs to be constantly tested and necessary corrections made to ensure that the color required by the customer is achieved.

8. The preparation process of the silica sol composite coating according to claim 7, characterized in that: Determine the desired viscosity range, select a suitable viscosity modifier, such as a thickener or diluent, add the viscosity modifier to the coating, and use a viscometer to perform a viscosity test. Based on the test results, adjust the amount of viscosity modifier until the desired viscosity range is achieved.

9. The preparation process of the silica sol composite coating according to claim 2, characterized in that: In S5, sol composite coatings should be stored in a dry, cool, well-ventilated warehouse, avoiding direct sunlight and high temperature. The temperature of the storage environment should be controlled between 5 and 40 degrees Celsius, and the humidity should be moderate to avoid the coating from getting damp or deteriorating. The stored coatings should be inspected regularly to ensure that the packaging is intact and leak-free, and the performance parameters of the coatings such as appearance, viscosity and color should be checked.

10. The preparation process of the silica sol composite coating according to claim 2, characterized in that: In S5, a sealing machine is used to seal the package, and a label is printed using a label printer and affixed to the package to indicate the name, specification, production date, and expiration date of the coating.

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