CN113502078A - Environment-friendly fireproof inorganic interior wall coating and preparation method thereof - Google Patents
Environment-friendly fireproof inorganic interior wall coating and preparation method thereof Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention belongs to the field of decorative materials, and particularly relates to an environment-friendly fireproof inorganic interior wall coating and a preparation method thereof. The environment-friendly fireproof inorganic interior wall coating comprises the following raw materials: 10-20 parts of silica sol, 3-10 parts of potassium silicate, 4-8 parts of emulsion, 0.1-1 part of cellulose, 30-50 parts of filler, 0.1-1 part of anti-settling agent, 0.5-1.5 parts of stabilizer, 0-5 parts of auxiliary agent and 20-40 parts of water. The inorganic interior wall coating has A-grade (non-combustible) fireproof performance, can resist high temperature and resist flame, and does not generate harmful gas; substances harmful to human bodies, such as Volatile Organic Compounds (VOC), free formaldehyde and the like are not detected, the odor is extremely low, and the environment is protected; excellent stability, crack resistance and mildew resistance, etc.
Description
Technical Field
The invention belongs to the field of decorative materials, and particularly relates to an environment-friendly fireproof inorganic interior wall coating and a preparation method thereof.
Background
The interior wall coating has the functions of protecting, decorating, covering defects and other special functions, and is a wall beautifying material which can be adopted by people in the decoration process. The performance of the paint is related to the health of residents, and if the paint contains a large amount of harmful substances, various diseases and injuries can be caused to human bodies. With the enhancement of health consciousness of people, people tend to create a green and environment-friendly home environment. The environmental-friendly inorganic interior wall coating is more and more valued by people.
At present, the traditional interior decoration basically adopts water-based emulsion paint, and the environmental protection and other properties can meet the daily requirements. However, as "technical regulations" for fire safety are released, the relevant departments have higher requirements on the fire-proof function of the building materials. In some markets, hotels, hospitals, schools and other public places, the quality and the environment-friendly characteristic of the coating are considered, the safety and fire-proof factors are also considered, and the environment-friendly coating with the fire-proof function is used.
The invention discloses a preparation method of an inorganic environment-friendly coating with A-grade fireproof function for an inner wall in a Chinese patent application with publication number CN109554006, and the components and mass percentages of the raw materials are as follows: 17-27% of deionized water, 0.4-0.8% of dispersing agent, 0.1-0.3% of wetting agent, 0.1-0.3% of hydroxyethyl methyl cellulose, 0.15-0.4% of defoaming agent, 15-22% of titanium dioxide, 5-12% of kaolin, 4-8% of talcum powder, 3-8% of modified magnesium hydroxide, 3-8% of elastic emulsion, 0.2-0.8% of stabilizing agent, 0.1-0.4% of methyl potassium silicate solution, 5-15% of silica sol, 20-30% of lithium silicate solution, 0.1-0.4% of defoaming agent and 0.2-1% of thickening agent.
The inorganic interior wall coating in the application document has comprehensive ingredients and reasonable collocation. By adopting the inorganic lithium silicate solution, better scrubbing resistance and water resistance are provided, and more importantly, excellent fireproof performance is provided. The smoke generated in the combustion is reduced by adding the modified magnesium hydroxide as a flame retardant. The phenomenon that a paint film of the inorganic coating is hard and easy to crack is improved by adding a small amount of elastic emulsion. However, the lithium silicate and magnesium hydroxide, which are film forming materials used in the invention, are high in cost, resulting in high price of final products. In addition, the product has poor storage stability, and the problems of poor adhesive force and easy cracking of the inorganic coating on an organic substrate cannot be solved by adopting the elastic emulsion, so that the application period and the application range of the inorganic coating are greatly reduced. Therefore, a new solution is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide an environment-friendly fireproof inorganic interior wall coating and a preparation method thereof, and solves the problems in the background art. The prepared inorganic interior wall coating has A-grade (non-combustible) fireproof performance, can resist high temperature and resist flame, and does not generate harmful gas; substances harmful to human bodies, such as Volatile Organic Compounds (VOC), free formaldehyde and the like are not detected, the odor is extremely low, and the environment is protected; excellent stability, crack resistance and mildew resistance, etc. .
In order to achieve the above object, a first aspect of the present invention provides an environment-friendly fireproof inorganic interior wall coating, which comprises the following raw materials:
10-20 parts of silica sol, 3-10 parts of potassium silicate, 4-8 parts of emulsion, 0.1-1 part of cellulose, 30-50 parts of filler, 0.1-1 part of anti-settling agent, 0.5-1.5 parts of stabilizer, 0-5 parts of auxiliary agent and 20-40 parts of water;
the silica sol is a nano silica dispersoid subjected to metal ion surface treatment;
the potassium silicate is silane-modified stable potassium silicate;
the emulsion is of a core-shell structure.
Preferably, the environment-friendly fireproof inorganic interior wall coating comprises the following raw materials: 10-17 parts of silica sol, 5-10 parts of potassium silicate, 5-8 parts of emulsion, 0.4-0.7 part of cellulose, 35-45 parts of filler, 0.1-0.3 part of anti-settling agent, 0.5-1 part of stabilizer, 1-3 parts of auxiliary agent and 20-33 parts of water.
According to the present invention, the nano silica dispersion surface-treated with metal ions (e.g., sodium/potassium ions) enhances electrostatic repulsive force of silica nanoparticles in a solution by positively charged metal ions, thereby achieving stabilization of silica sol.
Preferably, the nanosilica dispersion has a pH of 9-11 and a particle size of 8-14nm, such as Ultracoat manufactured by atlantoan materials technology (Shanghai) LtdTMCS-328 with pH of 9-11 and particle size of 8-14 nm. The nano silicon dioxide dispersion meeting the pH value and the particle size has the advantages that the silicon dioxide particles with the pH value and the particle size are more beneficial to the permeation of the base material, and the adhesive force of a paint film is improved.
Preferably, the potassium silicate is silane-modified stable potassium silicate, and compared with the conventional unmodified potassium silicate, the potassium silicate can effectively reduce the self-polymerization of the potassium silicate in a liquid state, so that in-tank cementation is prevented; the pH value of the stable potassium silicate is 10.5-12.5, and the modulus is 3.5-4.0. Produced by the same chemical company as Australian chemical Co., Ltd
K100, pH 11.5, modulus 3.9. The selection of a stabilized potassium silicate that meets the above pH and modulus benefits: the modular potassium silicate has better film forming continuity than the higher modular potassium silicate; compared with the potassium silicate with lower modulus, the active reaction group density of the potassium silicate with the modulus is lower, and the in-tank stability and the anti-cracking performance of a paint film are better.
Preferably, the emulsion is at least one selected from styrene-acrylate copolymer emulsion, vinyl acetate-acrylate copolymer emulsion, pure acrylic emulsion and organosilicon-acrylate copolymer emulsion, and the most preferred is styrene-acrylate copolymer emulsion. Furthermore, the styrene-acrylate copolymer emulsion is prepared by amine-free polymerization and advanced stripping technology, and harmful substances such as VOC (volatile organic compound) and free formaldehyde of the emulsion are not detected, and amine is not released, so that the product has excellent environmental protection performance. Further, the emulsion is in a power-level core-shell structure, a double electric layer protection technology is adopted, a cross-linking technology is combined, the polymer structure can be kept stable in a high-alkaline environment, as a preferable scheme, the glass transition temperature of the emulsion is 7-9 ℃, the lowest film forming temperature is lower than 5 ℃, for example, harmful substances such as VOC (volatile organic Compounds), free formaldehyde and the like are not detected in RS-837A produced by Ba-Fuji industries, and the lowest film forming temperature is lower than 5 ℃.
Preferably, the cellulose is selected from at least one of methyl ethyl hydroxyethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose, most preferably hydroxyethyl cellulose.
Preferably, the filler is at least one selected from titanium dioxide, kaolin, coarse whiting powder, talcum powder, silica powder and mica powder, and more preferably at least one selected from titanium dioxide, kaolin, coarse whiting powder and mica powder.
Preferably, the anti-settling agent is at least one selected from the group consisting of organobentonite, polyethylene wax, fumed silica and polyamide wax, and most preferably, organobentonite. As produced by the courtesy (Shanghai) chemical Co., Ltd
DY CE。
Preferably, the stabilizer is at least one selected from the group consisting of quaternary ammonium salts and quaternary ammonium bases, and most preferably a quaternary ammonium salt stabilizer. Such as produced by Craine chemical (China) Co., Ltd
SPS。
Preferably, the auxiliary agent comprises at least one of a wetting agent, a dispersing agent, a defoaming agent, an antifreezing agent, a pH regulator and a sterilization and mildew-proof agent. The auxiliary agent is more preferably at least one of a wetting agent, a dispersing agent, a defoaming agent, an antifreezing agent and a bactericidal and mildewproof agent. The kind and the amount of the auxiliary agent can be adjusted by those skilled in the art according to the needs, and other auxiliary agents can be selected according to the needs.
According to the invention, a ternary film forming system is formed by using modified potassium silicate, modified silica sol and core-shell structure emulsion, and after the coating is constructed and coated, the potassium silicate can be crosslinked to form a continuous and compact rigid paint film due to the lower modulus of the potassium silicate; the silica sol participates in the film forming reaction of the potassium silicate, and because the modulus is extremely high and the content of the metal oxide is low, the silica sol is not dissolved after being solidified, and the defect of insufficient water resistance after the potassium silicate film is formed can be overcome; the core-shell structure emulsion can buffer the stress of potassium silicate and silica sol in the film forming process, and the cracking resistance of a paint film is improved. Therefore, the ternary film forming system can ensure the film forming property and the anti-cracking property of the coating. In addition, silica sol and potassium silicate, which are subjected to special surface treatment, have relatively low crosslinking reaction rate in an in-can state; the addition of the stabilizer with the counter ion slows down the silicate crosslinking in the can, and therefore, the coating has excellent in-can storage stability.
The second aspect of the present invention provides a preparation method of the above-mentioned environment-friendly fireproof inorganic interior wall coating, which comprises the following steps:
1) uniformly mixing part of water, a stabilizer and an optional auxiliary agent to obtain a premixed solution;
2) uniformly mixing the premixed solution with filler, anti-settling agent and cellulose to obtain inorganic interior wall coating slurry;
3) and (3) uniformly mixing the inorganic interior wall coating slurry with potassium silicate and silica sol, and then uniformly mixing with the emulsion and the residual water to obtain the environment-friendly fireproof inorganic interior wall coating.
In a specific embodiment, the preparation method of the environment-friendly fireproof inorganic interior wall coating comprises the following steps:
1) uniformly mixing water, a stabilizer and an optional auxiliary agent under the stirring state of 400-500r/min, and stirring for 5-10min to obtain a premixed solution;
2) adding a filler and an anti-settling agent into the premixed liquid obtained in the step 1), gradually increasing the rotating speed to 800-1000r/min, and stirring for 5-10min until the mixture is uniformly stirred; adding cellulose, and dispersing at high speed of 1200-1500r/min until the fineness is less than or equal to 50um to obtain inorganic interior wall coating slurry;
3) adjusting the stirring speed to 600-800r/min, adding potassium silicate and silica sol into the inorganic interior wall coating slurry obtained in the step 2), uniformly mixing, and adding an emulsion; and adding the rest water to obtain the inorganic interior wall coating.
The technical scheme of the invention has the following beneficial effects:
the inorganic interior wall coating has A-grade (non-combustible) fireproof performance, can resist high temperature and resist flame, and does not generate harmful gas; substances harmful to human bodies, such as Volatile Organic Compounds (VOC), free formaldehyde and the like are not detected, the odor is extremely low, and the environment is protected; excellent stability, crack resistance and mildew resistance, etc.
1) The main film forming material of the inorganic interior wall coating is inorganic silica sol and potassium silicate, has flame resistance, can not burn at high temperature and has flame retardant property. According to the detection of the GB 8624 plus 2012 'fire performance grading' of building materials and products, the fire-retardant building material can meet the requirement of A-grade (non-combustible) building materials, can resist high temperature and resist flame, and does not generate harmful gas. The comfortable and safe living environment of public buildings such as schools, offices, hotels and hospitals is ensured.
2) The inorganic interior wall coating disclosed by the invention is free from artificially adding substances harmful to human bodies, such as Volatile Organic Compounds (VOC), free formaldehyde and the like, and is more environment-friendly. According to the detection of the standard GB18582-2020 Limited quantity of harmful substances in the building coating, the harmful substances such as VOC, free formaldehyde, benzene series, heavy metals and the like are not detected. In addition, the raw materials including silica sol, potassium silicate and emulsion are subjected to odor screening, and the odor is extremely low; the adopted emulsion is an emulsion with low MFFT (minimum film forming temperature) developed by combining with an emulsion supplier, does not need to add a film forming auxiliary agent, and reduces the odor caused by the hydrolysis of esters under the alkaline condition.
3) The inorganic inner wall paint of the invention adopts a powder system with lower metal ion content, thereby avoiding the reaction of metal ions and potassium silicate to accelerate the caking of the paint in a tank. In addition, the used silica sol and potassium silicate are both stabilized, and the ionic stability in the coating system can be greatly improved. Compared with the traditional inorganic coating, the inorganic interior wall coating prepared by the formula has excellent storage stability, can be stored and guaranteed for a long time, does not agglomerate or cake, and can support long-time use of the product.
4) The inorganic interior wall coating material of the present invention has excellent crack resistance. The low Tg emulsion used in the invention can greatly improve the internal stress of the coating during film formation. In addition, in the invention, the optimal film forming material proportion is optimized, and the excellent anti-cracking performance of the paint film is ensured.
5) The inorganic interior wall coating adopts a composite film forming technology, takes inorganic components as main film forming substances and organic components as secondary film forming substances, ensures the flame resistance, can form a film on an inorganic base material and also can form a film on an organic coating, and can show excellent adhesive force and cracking resistance on the inorganic base material and the organic base material.
6) In the invention, the inorganic interior wall finish adopts inorganic silica sol and potassium silicate which can not support the growth of mould as main film forming substances, thereby greatly reducing the possibility of the growth of mould. The inorganic interior wall finish has a porous skeleton structure due to the fact that the film forming process is a chemical crosslinking curing process, air permeability is achieved, a building can be kept dry, mold breeding is not facilitated, and the inorganic interior wall finish is preferably compounded with a slow-release dry film mildew inhibitor with strong alkali resistance and has better mildew resistance. The inorganic interior wall coating has an excellent mildew-proof effect, and the coating cannot grow mildew no matter the coating is wet or dry, so that the service life of the coating is long.
7) The production process of the inorganic interior wall finish is simple and easy to operate, labor cost and time cost are reduced in a large range, and the inorganic interior wall finish is very suitable for large-scale production.
8) The inorganic interior wall paint has simple construction process and is very suitable for large-area construction.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer. Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
In the series of examples:
the nano-silica disperse silica sol subjected to metal ion surface treatment is UltraCoat produced by Qinghai atlas Material science and technology (Shanghai) Co., LtdTMCS-328 with pH of 9-11 and particle size of 8-14 nm.
The stable potassium silicate modified by the alkane is produced by Shanghai Australian chemical Co., Ltd
K100, pH 11.5, modulus 3.9.
The styrene-acrylate copolymer emulsion is RS-837A produced by Bade Fukuji Co Ltd, harmful substances such as VOC, free formaldehyde and the like are not detected, and the minimum film forming temperature is less than 5 ℃.
The organic bentonite dust-proof agent is produced by moderate (Shanghai) chemistry Co., Ltd
DY CE。
The quaternary ammonium salt stabilizer is prepared by Claien chemical industry (China) Co., Ltd
SPS。
The sterilization mildew preventive is produced by Torrel special chemical (Zhenjiang) Limited company
EPW 2。
Examples 1 to 3
The invention provides an inorganic interior wall coating and a preparation method thereof, and the use amount of each component in the embodiment is weight portion.
TABLE 1 EXAMPLES 1 TO 3 Each component amount (parts by weight)
| Name (R) | Example 1 | Example 2 | Example 3 |
| Deionized water | 28.8 | 23.4 | 33.9 |
| Potassium silicate | 5.0 | 3.0 | 10.0 |
| Silica sol | 15.0 | 17.0 | 10.0 |
| Aqueous styrene-acrylate copolymer emulsion | 5.0 | 8.0 | 7.0 |
| Cellulose, process for producing the same, and process for producing the same | 0.6 | 0.6 | 0.5 |
| Filler material | 42.0 | 45.0 | 35.0 |
| Anti-settling agent | 0.2 | 0.2 | 0.2 |
| Stabilizer | 1.0 | 0.5 | 1.0 |
| Auxiliary agent: | 2.4 | 2.3 | 2.4 |
| wetting agent | 0.2 | 0.2 | 0.2 |
| Dispersing agent | 0.7 | 0.7 | 0.5 |
| Defoaming agent | 0.6 | 0.6 | 0.6 |
| Antifreeze agent | 0.4 | 0.3 | 0.6 |
| Bactericidal mildew inhibitor | 0.5 | 0.5 | 0.5 |
| Total of | 100.0 | 100.0 | 100.0 |
Comparative examples 1 to 6
The invention provides inorganic interior wall coating and a preparation method thereof in each proportion, and the use amounts of the components in the proportion are parts by weight.
TABLE 2 comparative examples 1 to 6 amounts (parts by weight) of each component
The specific preparation methods of the inorganic interior wall coating provided in the above examples 1 to 3 and comparative examples 1 to 6 are as follows:
1) under the stirring state of 400-500r/min, uniformly mixing part of deionized water, a stabilizing agent, a wetting agent, a dispersing agent, a defoaming agent, an antifreezing agent and an auxiliary agent, and stirring for 5-10min to obtain a premixed solution.
2) Adding the filler and the dust-proof agent into the premixed liquid of the auxiliary agent under the stirring state of 400-1500 r/min, gradually increasing the rotating speed to 800-1000r/min, stirring for 5-10min to a uniform state, then adding the cellulose, and dispersing at a high speed of 1200-1500r/min for 5-10min until the fineness is less than or equal to 50um to obtain the slurry of the inorganic interior wall coating.
3) Adjusting the stirring speed to be 600-800r/min, adding potassium silicate and silica sol, stirring for 5-10min, uniformly mixing, and adding the emulsion.
4) And adding the sterilization mildew preventive and the water in the rest formula amount, and continuously stirring for 5-10min at the rotating speed of 600-.
Examination example
This test was conducted on the inorganic interior wall coatings of examples 1 to 3 and comparative examples 1 to 6, and included: combustion performance, VOC free formaldehyde and other harmful substances and odor, stability, cracking resistance and mildew resistance. The test methods for each test item are described below.
Combustion performance: the method is detected by referring to a detection method of GB 8624 and 2012 'grading of combustion performance of building materials and products'.
Content of harmful substances such as VOC and free formaldehyde: the detection is carried out according to a detection method of GB 18582-. Odor: the inorganic interior wall coatings of examples 1 to 3 and comparative examples 1 to 6 were compared with commercially available interior wall clear odor coatings, respectively. The test is divided into in-tank smell and construction smell, the in-tank smell adopts a 1L iron tank, the tank is filled with about 1/2 coating, and then manual smell identification is randomly searched; the construction smell is selected to be more than 1m3The odor cabin is coated with paint (load ratio: 1 m)2/m3The coating rate: 200g/m2) And then closing the cabin door, keeping the temperature in the cabin to be 23 +/-2 ℃, the humidity to be 50 +/-5%, the ventilation frequency to be 0.5 +/-0.025 AC/h and the air flow rate on the surface of the sample to be 0.1-0.3 m/s, and extracting the air after one week to randomly search for artificial olfaction and identification. The odor of the interior wall odor-free coating is equivalent to 0 minute; the odor of the interior wall odor-removing coating is obviously neutral and the irritation is 5 points.
The stability performance is as follows: it is classified into normal temperature storage stability, thermal storage stability and low temperature stability. The inorganic interior wall coatings of examples 1 to 3 and comparative examples 1 to 6 were allowed to stand at normal temperature for 12 months, respectively, and the viscosity and the apparent state of the coating sample before and after the standing were compared. If no layering exists in the tank, the mixture is stirred uniformly, and the apparent state is 0 min; the apparent state is 5 minutes if the coating is not flowable, seriously delaminates, or agglomerates in a large area. Thermal storage stability test the inorganic interior wall coatings of examples 1 to 3 and comparative examples 1 to 6 were respectively placed in an oven at 50 ℃ and taken out after 1 month to detect the viscosity change and the apparent state. If no layering exists in the tank, the uniform apparent state after stirring is 0 min; the coating is non-flowable, has serious delamination, or has a large-area caking apparent state of 5 minutes. The freeze-thaw stability test refers to a test method of low-temperature stability in GB/T9755-2014 synthetic resin emulsion exterior wall paint.
Cracking resistance: selecting a cement board with internal wall putty, respectively rolling and coating permeable internal wall penetrating primer, internal wall covering primer, inorganic internal wall primer and internal wall superior product finish (simulated compact organic coating) on the putty, respectively brushing and coating the inorganic internal wall coating (coating weight is about 200 g/m) of examples 1-3 and comparative examples 1-6 on the surface of a substrate (coating weight is about 200 g/m)2) And observing the coating condition on the surface of the base material after the base material is completely dried at room temperature. The bad states of a paint film, such as no cracking and peeling, are 0 min; the severe cracking and peeling was 5 points. Mildew resistance: the test is carried out according to the test method GB/T1741-2007 'determination method for the resistance to mildew of paint films'.
The results of the tests of the flame retardancy, environmental protection performance, stability, cracking resistance and mildew resistance of the inorganic interior wall coatings of examples 1 to 3 and comparative examples 1 to 6 are shown in tables 3 and 4, respectively.
In the aspect of combustion performance, the inorganic interior wall coating of the embodiment 1-3 can meet the requirements of A-grade (non-combustible) building materials; the inorganic interior wall coating of the comparative example 4 has high emulsion addition, so that the organic matter content of a paint film is high, and the combustion performance can only meet the requirements of B-grade building materials.
In terms of environmental protection performance, the test results of the inorganic interior wall coating of examples 1 to 3 on harmful substances such as VOC and free formaldehyde were not detected, and the odor in the tank and the construction odor were extremely low; the inorganic interior wall coating of comparative example 2 has a high potassium silicate content and a too high alkalinity, which causes ammonia decomposition of some amino-containing organic substances in the system and is slightly inferior in construction odor.
In terms of stability, the inorganic interior wall coating materials of examples 1 to 3 exhibited excellent stability, in which the change in viscosity upon normal temperature storage was within 10KU and the storage state was good, and the change in viscosity upon heat storage was within 15KU and the storage state was good, and the low-temperature stability passed; the addition amount of the silica sol in the comparative example 1 is slightly higher, the low-temperature stability is relatively poor, the addition amount of the potassium silicate in the comparative example 2 is too high, the reaction activity is too strong, and the stabilizer is not added in the comparative example 6, so that the normal-temperature storage stability and the heat storage stability of the two examples are relatively poor, and the anti-settling agent is not added in the comparative example 5, the normal-temperature heat storage and the heat storage are both seriously layered, and the state is relatively poor.
In terms of anti-cracking performance, the inorganic interior wall coating of examples 1-3 shows excellent anti-cracking performance on different base materials (interior wall penetrating primer, interior wall covering primer, interior wall inorganic primer and interior wall top-grade finish); in contrast, in comparative example 3, no emulsion was added, the film-forming stress of the paint film was too high, the paint film was brittle, and cracking was severe on organic substrates (inner wall covering primer and inner wall top-grade finish).
In the aspect of mold resistance, the inorganic interior wall coating of the embodiment 1 to 3 has a mold resistance grade of 0 grade; while the pH of comparative example 1 is relatively low, mold can grow on the surface of the paint film, and the mold resistance rating is only 1.
Through the comparison of the performances of the examples and the comparative examples, the inorganic coating for the inner wall has certain advantages in the aspects of combustion performance, VOC, free formaldehyde and other harmful substances and odors, stability, anti-cracking performance and mold resistance.
TABLE 3 Standard test results for examples 1-3
TABLE 4 Standard test results for comparative examples 1-6
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and all such modifications, equivalents and improvements that come within the spirit and scope of the invention are therefore intended to be included therein. It is intended that the invention be limited in any way so that any modification or variation of the invention herein disclosed which comes within the spirit of the invention is encompassed by the invention as hereinafter claimed.
Claims (10)
1. The environment-friendly fireproof inorganic interior wall coating is characterized by comprising the following raw materials:
10-20 parts of silica sol, 3-10 parts of potassium silicate, 4-8 parts of emulsion, 0.1-1 part of cellulose, 30-50 parts of filler, 0.1-1 part of anti-settling agent, 0.5-1.5 parts of stabilizer, 0-5 parts of auxiliary agent and 20-40 parts of water;
the silica sol is a nano silica dispersoid subjected to metal ion surface treatment;
the potassium silicate is silane-modified stable potassium silicate;
the emulsion is of a core-shell structure.
2. The environmentally friendly fireproof inorganic interior wall coating of claim 1, wherein the nanosilica dispersion has a pH of 9-11 and a particle size of 8-14 nm.
3. The environmentally friendly fireproof inorganic interior wall coating material according to claim 1, wherein the stable potassium silicate has a pH of 10.5 to 12.5 and a modulus of 3.5 to 4.0.
4. The environment-friendly fireproof inorganic interior wall coating according to claim 1, wherein the emulsion is selected from at least one of styrene-acrylate copolymer emulsion, vinyl acetate-acrylate copolymer emulsion, pure acrylic emulsion, and silicone-acrylate copolymer emulsion.
5. The environment-friendly fireproof inorganic interior wall coating according to claim 1, wherein the glass transition temperature of the emulsion is 7-9 ℃ and the minimum film forming temperature is less than 5 ℃.
6. The environmentally friendly fire-resistant inorganic interior wall coating material of claim 1, wherein the cellulose is selected from at least one of methylethylhydroxyethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, and carboxymethylcellulose.
7. The environment-friendly fireproof inorganic interior wall coating according to claim 1, wherein the filler is at least one selected from titanium dioxide, kaolin, coarse whiting powder, talcum powder, silica powder and mica powder.
8. The environmentally friendly fire-retardant inorganic interior wall coating material according to claim 1,
the anti-settling agent is selected from at least one of organic bentonite, polyethylene wax, fumed silica and polyamide wax;
the stabilizer is at least one of quaternary ammonium salt and quaternary ammonium base.
9. The environmentally friendly fire-retardant inorganic interior wall coating material according to claim 1,
the auxiliary agent comprises at least one of a wetting agent, a dispersing agent, a defoaming agent, an antifreeze agent, a pH regulator and a sterilization and mildew preventive.
10. The method for preparing the environment-friendly fireproof inorganic interior wall coating according to any one of claims 1 to 9, wherein the preparation method comprises the following steps:
1) uniformly mixing part of water, a stabilizer and an optional auxiliary agent to obtain a premixed solution;
2) uniformly mixing the premixed solution with filler, anti-settling agent and cellulose to obtain inorganic interior wall coating slurry;
3) and (3) uniformly mixing the inorganic interior wall coating slurry with potassium silicate and silica sol, and then uniformly mixing with the emulsion and the residual water to obtain the environment-friendly fireproof inorganic interior wall coating.
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| CN113897081A (en) * | 2021-11-22 | 2022-01-07 | 福建省三棵树新材料有限公司 | Phase-change temperature-regulating inorganic interior wall coating and preparation method thereof |
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