Preparation method and application method of high-temperature-resistant defoaming agent based on water-soluble silicon

Abstract

The invention relates to a high-temperature-resistant defoaming agent based on water-soluble silicon, the high-temperature-resistant defoaming agent comprises a solvent and raw materials, the raw materials comprise, by mass, 5-30 parts of a titanium compound, 10-30 parts of water-soluble silica sol, 2-3 parts of a dispersant, 2-3 parts of a surfactant and 2-3 parts of a flame retardant, and the solvent comprises, by mass, 31-79 parts of pure water. According to the high-temperature-resistant defoaming agent based on the water-soluble silicon, the problems of high cost, strong pollution and harmfulness, poor foam inhibition capability of an organic silicon defoaming agent and complex preparation process in a traditional defoaming agent applied to a glass kiln are solved, a synthesis method which is simple in preparation process and green and environment-friendly is provided, the effect of eliminating a foam layer can be efficiently achieved, and the high-temperature-resistant defoaming agent based on the water-soluble silicon is suitable for industrial production. And the foam layer is eliminated in a mode of combining physical defoaming and chemical defoaming.

Description

Technical Field

[0001] The invention relates to the technical field of defoamer production, and in particular to a preparation method and an application method of a high-temperature resistant defoamer based on water-soluble silicon. Background Art

[0002] With the global emphasis on renewable energy and the booming development of the solar energy industry, the market demand for photovoltaic glass, as one of the key components of solar cells, continues to grow. Glass melting is one of the most important processes in glass production. The melting capacity of a single photovoltaic glass melting furnace has been upgraded from the initial 250t / d level to more than 1000t / d. The melting rate of the melting furnace has increased, and the melting part has no large enough area to share the white foam layer. The foam area covers an area that is too large. On the one hand, it blocks the heat from being transferred downward to the glass liquid, resulting in weak temperature convection, low glass liquid temperature, slow melting of glass batch materials, and other problems such as reduced furnace efficiency and difficulty in clarification. On the other hand, it is reflected upward to the furnace space, causing the breast wall and arch top temperature to be too high, reducing thermal efficiency and shortening the life of the furnace. Secondly, in the production process of photovoltaic glass, bubbles are easily generated on the glass surface. These bubbles not only seriously affect the light transmittance and aesthetics of the product, but also reduce its photoelectric conversion efficiency and increase production costs. Therefore, it is of great significance to eliminate bubbles through defoaming agents, improve glass quality, and save energy and reduce consumption.

[0003] Defoamers are widely used compounds. In the melting of photovoltaic glass, the traditional defoaming and foam suppression method is to use butyl titanate plus aviation kerosene. This method can achieve good defoaming effects, but the cost is high, and aviation kerosene is not only not environmentally friendly but also a highly hazardous chemical that is strictly controlled by the government. At present, silicone defoamers are gradually replacing traditional defoamers. Such defoamers are often polysiloxane defoamers. Polyether chains are introduced into polysiloxane chains through condensation technology. In the molecules of siloxane copolymers, the siloxane segment is a lipophilic group and the polyether segment is a hydrophilic group. The polyethylene oxide chain in the polyether segment can provide hydrophilicity and foaming properties, and the polypropylene oxide chain can provide hydrophobicity and permeability. It has a strong effect on reducing surface tension, making it have the advantages of the second type of defoamer, but the preparation is complicated and the foam suppression ability is weak. Therefore, it is necessary to provide an implementation plan for the problems discussed above and make further improvements. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a preparation method and application method of a high-temperature resistant defoaming agent based on water-soluble silicon, which can overcome the problems of high cost, strong pollution and harmfulness of traditional defoaming agents, poor foam suppression ability of silicone defoaming agents, and complex preparation process, and provides a synthesis method with a simple preparation process and green environmental protection, which can effectively achieve the effect of eliminating the foam layer and eliminate the foam layer by combining physical defoaming with chemical defoaming.

[0005] After the defoamer is atomized by the defoaming spray gun, the hydrophobic particles in the ingredients become hydrophilic and enter the water phase to act on the tiny bubbles on the surface, destroying the surface tension of the bubbles, causing the bubbles to burst and eliminate, and reducing the formation of a foam layer after the tiny bubbles grow and accumulate. Under high temperature, the water and solvent in the defoamer evaporate rapidly, and the solute molecules become solid crystalline particles, which settle on the foam surface and puncture the foam layer.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a high temperature resistant defoaming agent based on water-soluble silicon, comprising a solvent and raw materials, characterized in that: in terms of mass fraction, the raw materials comprise: 5 to 30 parts of a titanium compound, 10 to 30 parts of a water-soluble silica sol, 2 to 3 parts of a dispersant, 2 to 3 parts of a surfactant, and 2 to 3 parts of a flame retardant, and the solvent comprises: 31 to 79 parts of pure water;

[0007] Furthermore, the titanium compound is obtained by reacting butyl titanate, acrylic acid and lactic acid.

[0008] Furthermore, the water-soluble silica sol is obtained by uniformly dispersing modified silicon dioxide in water in the form of flocs to form a colloidal solution of silicate polymers, and adding a small amount of sodium oxide as a stabilizer. The water-soluble silica sol is a system in which amorphous silicon dioxide is dispersed in a water solute to form a colloidal solution of silicate polymers, and a small amount of sodium oxide is added as a stabilizer, and the appearance is milky white.

[0009] Furthermore, the titanium compound is in the rutile form with a viscosity of 180 mm 2 / s.

[0010] Furthermore, the dispersant is an amine dispersant.

[0011] A method for preparing a high temperature resistant defoaming agent based on water-soluble silicon, characterized in that it comprises the following steps:

[0012] Step 1: reacting butyl titanate, acrylic acid and lactic acid to obtain a modified water-soluble titanium compound;

[0013] Step 2: Dispersing the modified silica in the form of micelles evenly in water to form a colloidal solution of silica polymers, and adding a small amount of sodium oxide as a stabilizer to obtain a water-soluble silica sol;

[0014] Step 3: Stir 10 to 30 parts of water-soluble silica sol and 5 to 30 parts of water-soluble titanium compound;

[0015] Step 4: Add 2-3 parts of dispersant and 2-3 parts of surfactant and continue stirring;

[0016] Step 5: Add 2-3 parts of flame retardant and 31-79 parts of pure water, and continue stirring until it becomes a light yellow, transparent and uniform liquid to obtain a defoaming agent.

[0017] Furthermore, the defoaming agent has a density of 0.9-1.2 g / mL, a pH value of PH≈9, and a viscosity of 2.21 mPa·s.

[0018] Conductivity: 567μS / cm; Salinity: 0.03TDS: 282mg / L.

[0019] The invention discloses an application method of a high temperature resistant defoaming agent based on water-soluble silicon, characterized in that the defoaming agent is sprayed in a glass kiln to achieve defoaming, the glass batch enters the kiln, decomposes and melts under high temperature conditions, and generates a large number of tiny bubbles, the defoaming agent sprayed on the surface of the molten glass liquid immediately acts on the tiny bubbles on the surface, and utilizes the surface activity of the high temperature resistant nano material particles to reduce the surface tension of the foam, so that the walls of the tiny bubbles are thinned and broken, and the tiny bubbles are reduced from aggregating into white foam; at the same time, under high temperature conditions, the particles left by the evaporation of the defoaming agent can eliminate the white foam, so as to achieve the effect of completely eliminating the foam; in the whole defoaming process, the defoaming agent spray flow rate is controlled at 12 to 16 L / H.

[0020] Compared with the prior art, the present invention provides a preparation method and application method of a high temperature resistant defoaming agent based on water-soluble silicon, which has the following beneficial effects:

[0021] 1. The present invention adopts the method of in-kiln spraying, combining chemical defoaming in the initial stage of bubble generation and physical defoaming in the foam formation stage to carry out effective defoaming. In the initial stage, the hydrophilic particles and surfactants in the defoaming agent destroy the tension of small bubbles and reduce the aggregation of bubbles to form a foam layer; under high temperature conditions, the formed crystal particles can be physically punctured to effectively remove the formed foam layer.

[0022] 2. The aqueous solution based on red stone TiO2 can not only form crystalline granular substances together with silica sol at high temperature, but also has good light scattering effect and ability to absorb ultraviolet light. It can absorb ultraviolet light entering the defoamer system, protect the chemical bonds of the entire polymer component from being destroyed by ultraviolet light, and improve the stability of the defoamer structure, thereby effectively improving the defoaming performance and storage time of the defoamer.

[0023] 3. The raw materials of the defoaming agent of the present invention are easy to obtain. Compared with the traditional defoaming agent using raw materials such as aviation kerosene, it solves the technical problems of complex process, high cost, environmental pollution, low safety factor, and poor defoaming effect. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] A high temperature resistant defoaming agent based on water-soluble silicon comprises a solvent and raw materials, characterized in that: in terms of mass fraction, the raw materials comprise: 5 to 30 parts of a titanium compound, 10 to 30 parts of a water-soluble silica sol, 2 to 3 parts of a dispersant, 2 to 3 parts of a surfactant, and 2 to 3 parts of a flame retardant; and the solvent comprises: 31 to 79 parts of pure water.

[0026] In this embodiment, the defoaming agent is mainly obtained by mixing and stirring a solvent and raw materials, wherein the solvent is pure water without impurities; the raw materials include titanium compounds, water-soluble silica sol, dispersants, surfactants, and flame retardants in accordance with mass percentages.

[0027] Specifically, the raw material titanium compound is 5 to 30 parts, the water-soluble silica sol is 10 to 30 parts, the dispersant is 2 to 3 parts, the surfactant is 2 to 3 parts, the flame retardant is 2 to 3 parts, and the pure water is 31 to 79 parts according to mass percentage.

[0028] It should be noted that the titanium compound is obtained by reacting butyl titanate, acrylic acid and lactic acid. The crystal form of the titanium compound is rutile and the viscosity is 180 mm 2 / s; water-soluble silica sol is obtained by uniformly dispersing modified silicon dioxide in water in the form of micelles to form a colloidal solution of silicate polymers, and adding a small amount of sodium oxide as a stabilizer. The water-soluble silica sol is a system in which amorphous silicon dioxide is dispersed in water solute to form a colloidal solution of silicate polymers, and a small amount of sodium oxide is added as a stabilizer, and the appearance is milky white; the dispersant is an amine dispersant.

[0029] Another technical problem to be solved by the present invention is a method for preparing a high temperature resistant defoaming agent based on water-soluble silicon, comprising the following steps:

[0030] Step 1: reacting butyl titanate, acrylic acid and lactic acid to obtain a modified water-soluble titanium compound;

[0031] Step 2: Dispersing the modified silica in the form of micelles evenly in water to form a colloidal solution of silica polymers, and adding a small amount of sodium oxide as a stabilizer to obtain a water-soluble silica sol;

[0032] Step 3: Stir 10 to 30 parts of water-soluble silica sol and 5 to 30 parts of water-soluble titanium compound;

[0033] Step 4: Add 2-3 parts of dispersant and 2-3 parts of surfactant and continue stirring;

[0034] Step 5: Add 2 to 3 parts of flame retardant and 31 to 79 parts of pure water, and continue stirring until it becomes a light yellow, transparent and uniform liquid to obtain a defoaming agent. The density of the defoaming agent is 0.9 to 1.2 g / mL, and the pH value is PH≈9; viscosity: 2.21 mPa·s; conductivity: 567 μS / cm; salinity: 0.03 TDS: 282 mg / L.

[0035] Another technical problem to be solved by the present invention is an application method of a high-temperature resistant defoaming agent based on water-soluble silicon. The defoaming agent is sprayed in a glass kiln to achieve defoaming. The glass batch enters the kiln, decomposes and melts under high temperature conditions, and produces a large number of tiny bubbles. The defoaming agent sprayed on the surface of the molten glass liquid immediately acts on the tiny bubbles on the surface, and utilizes the surface activity of the high-temperature resistant nanomaterial particles to reduce the surface tension of the foam, thinning and breaking the walls of the tiny bubbles, and reducing the aggregation of tiny bubbles into white foam. At the same time, under high temperature conditions, the particles left by the evaporation of the defoaming agent can eliminate the white foam to achieve the effect of completely eliminating the foam. During the entire defoaming process, the defoaming agent injection flow rate is controlled at 12 to 16 L / H.

[0036] The working principle of the above embodiment is:

[0037] In practical application of the invention, firstly, 20 parts of water-soluble silica sol and 18 parts of water-soluble titanium compound are stirred.

[0038] Next, add 2 parts of dispersant and 3 parts of surfactant and continue stirring.

[0039] Finally, add 2 parts of flame retardant and 55 parts of pure water, and continue stirring until a light yellow, transparent and uniform liquid is obtained to obtain a defoaming agent.

[0040] The defoamer has a density of 1.1 g / mL, a pH value of PH≈9, a viscosity of 2.21 mPa·s, a conductivity of 567 μS / cm, and a salinity of 0.03 TDS: 282 mg / L.

[0041] After the defoaming agent is obtained, the foam on the surface of the glass liquid is defoamed by spraying in the glass kiln. The glass batch enters the kiln, decomposes and melts under high temperature conditions, and generates a large number of tiny bubbles. The defoaming agent sprayed on the surface of the molten glass liquid immediately acts on the tiny bubbles on the surface, and utilizes the surface activity of the high-temperature resistant nano material particles to reduce the surface tension of the foam, thinning and breaking the tiny bubble walls, and reducing the aggregation of tiny bubbles into white foam; at the same time, under high temperature conditions, the particles left by the evaporation of the defoaming agent can eliminate the white foam to achieve the effect of completely eliminating the foam; during the entire defoaming process, the defoaming agent injection flow rate is controlled at 14L / H.

[0042] Butyl orthotitanate, acrylic acid, lactic acid, silicon dioxide, sodium oxide, amine dispersants, surfactants, flame retardants, etc. mentioned in the article are conventional chemical raw material components and belong to existing public technologies and will not be described in detail in the article.

[0043] It should be noted that, in this article, terms such as "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including the following..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant defoamer based on water-soluble silicon, comprising a solvent and a raw material, characterized in that: In terms of mass fraction, the raw materials include: 5 to 30 parts of titanium compound, 10 to 30 parts of water-soluble silica sol, 2 to 3 parts of dispersant, 2 to 3 parts of surfactant, 2 to 3 parts of flame retardant, and the solvent includes: 31 to 79 parts of pure water.

2. A high temperature resistant defoaming agent based on water-soluble silicon according to claim 1, characterized in that: The titanium compound is obtained by reacting butyl titanate, acrylic acid and lactic acid.

3. A high temperature resistant defoaming agent based on water-soluble silicon according to claim 1, characterized in that: The water-soluble silica sol is obtained by uniformly dispersing modified silicon dioxide in water in the form of flocs to form a colloidal solution of silicate polymers, and adding a small amount of sodium oxide as a stabilizer. The water-soluble silica sol is a system in which amorphous silicon dioxide is dispersed in a water solute to form a colloidal solution of silicate polymers, and adding a small amount of sodium oxide as a stabilizer, and has a milky white appearance.

4. A high temperature resistant defoaming agent based on water-soluble silicon according to claim 2, characterized in that: The titanium compound has a rutile crystal form and a viscosity of 180 mm 2 / s.

5. The high temperature resistant defoaming agent based on water-soluble silicon according to claim 1, characterized in that: The dispersant is an amine dispersant.

6. A method for preparing a high temperature resistant defoaming agent based on water-soluble silicon according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: reacting butyl titanate, acrylic acid and lactic acid to obtain a modified water-soluble titanium compound; Step 2: Dispersing the modified silica in the form of micelles evenly in water to form a colloidal solution of silica polymers, and adding a small amount of sodium oxide as a stabilizer to obtain a water-soluble silica sol; Step 3: Stir 10 to 30 parts of water-soluble silica sol and 5 to 30 parts of water-soluble titanium compound; Step 4: Add 2-3 parts of dispersant and 2-3 parts of surfactant and continue stirring; Step 5: Add 2-3 parts of flame retardant and 31-79 parts of pure water, and continue stirring until it becomes a light yellow, transparent and uniform liquid to obtain a defoaming agent.

7. The method for preparing a high temperature resistant defoaming agent based on water-soluble silicon according to claim 6, characterized in that: The defoamer has a density of 0.9-1.2 g / mL and a pH value of PH≈9; Viscosity: 2.21mPa·s; Conductivity: 567μS / cm; Salinity: 0.03TDS: 282mg / L.

8. The application method of the high temperature resistant defoaming agent based on water-soluble silicon according to claim 1 or 6, characterized in that: The defoaming agent is sprayed in a glass kiln to achieve defoaming. The glass batch enters the kiln, decomposes and melts under high temperature conditions, and generates a large number of tiny bubbles. The defoaming agent sprayed on the surface of the molten glass liquid immediately acts on the tiny bubbles on the surface, and utilizes the surface activity of the high-temperature resistant nano material particles to reduce the surface tension of the foam, so that the walls of the tiny bubbles are thinned and broken, and the tiny bubbles are reduced from gathering into white foam. At the same time, under high temperature conditions, the particles left by the evaporation of the defoaming agent can eliminate the white foam, so as to achieve the effect of completely eliminating the foam. During the entire defoaming process, the defoaming agent injection flow rate is controlled at 12 to 16 L / H.