CN111847975A - Preparation and application method of gypsum composite mildew inhibitor with waterproof function - Google Patents
Preparation and application method of gypsum composite mildew inhibitor with waterproof function Download PDFInfo
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Abstract
The invention discloses a preparation method and an application method of a gypsum composite mildew preventive with a waterproof function, wherein the preparation method comprises the following components in parts by weight: 3-8 parts of inorganic antibacterial component, 3-8 parts of chitosan, 3-7 parts of sodium methyl silicate, 4-14 parts of silicone-acrylic emulsion, 0.2-2 parts of pH regulator and 0.1-1 part of sodium dodecyl sulfate. On one hand, the invention can efficiently eliminate mould by compounding chitosan and inorganic antibacterial components; on the other hand, the waterproof component is adopted to effectively prevent the interior of the gypsum from easily forming an environment suitable for the existence of the mould; the pH regulator can inhibit the survival of most bacteria and improve the film forming quality; the adoption of the sodium dodecyl sulfate can lead the waterproof component and the antibacterial component to be uniformly dispersed in the gypsum, improve the mildew resistance of the gypsum to reach 0 grade, and has a hydrophobic effect, the saturated water absorption is reduced by more than 5 times compared with the common gypsum, and the softening coefficient reaches more than 0.86. The preparation and application method is simple and easy to operate, so that the gypsum can be used in the areas which are easy to wet, such as kitchens, bathrooms and the like, and the application range of the gypsum product is widened.
Description
Technical Field
The invention relates to a preparation method and an application method of a gypsum composite mildew preventive with a waterproof function, and belongs to the technical field of preparation of building material mildew preventives.
Background
The building gypsum product is a material made of building gypsum as a main raw material, has the advantages of light weight, fire resistance, heat insulation, good processing performance, unique 'breathing effect' and the like, and is widely promoted by the building industry.
However, when the gypsum product is used, if the gypsum product is contacted with a water source or in a dark and humid environment, the surface of the gypsum product is easy to generate mildewing. The mildewed gypsum product is characterized in that the gypsum is a material containing certain nutrients, most of the mildewed gypsum products are caused by dampness, the durability and the aesthetic degree of the mildewed gypsum product are greatly influenced when the mildewed gypsum product is mildewed, and the mildewed gypsum product is not suitable for being used continuously. The water-resistant function of the gypsum is improved, so that the mildew resistance of the gypsum can be improved to a certain extent; the addition of the mildew preventive can inhibit the generation of bacteria and improve the antibacterial effect of the gypsum. The development of the gypsum mildew inhibitor with the water-resistant function can prevent the gypsum product from mildewing in a humid environment, and obviously improve the durability and the aesthetic degree of the gypsum product.
Disclosure of Invention
The invention mainly overcomes the defects in the prior art and provides a preparation method and an application method of a gypsum composite mildew inhibitor with a waterproof function. According to the invention, the inorganic antibacterial component, the organic antibacterial component and the waterproof component are compounded, so that the mildew phenomenon of a gypsum product in a humid environment can be prevented, the mildew resistance of the gypsum is obviously improved, and the preparation method and the application method are simple and easy to operate.
The technical scheme provided by the invention for solving the technical problems is as follows: a gypsum composite mildew inhibitor with a waterproof function comprises the following components in parts by weight: 3-8 parts of inorganic antibacterial component, 3-8 parts of chitosan, 3-7 parts of sodium methyl silicate, 4-14 parts of silicone-acrylic emulsion, 0.2-2 parts of pH regulator and 0.1-1 part of sodium dodecyl sulfate; the inorganic antibacterial component comprises 1-3 parts of nano silver, 1-3 parts of borax and 1-5 parts of nano titanium dioxide.
The further technical scheme is that the nano titanium dioxide is lipophilic nano titanium dioxide, the crystal form is anatase, the particle size is 30-60 nm, and the purity is more than 99.5%.
The further technical scheme is that the nano silver is wet nano silver powder with the purity of more than 99%, and the particle size is 15-30 nm; the borax is chemical analysis pure grade sodium tetraborate decahydrate, and the purity is more than 99%.
The further technical proposal is that the inorganic antibacterial component also comprises a carrier, the carrier is montmorillonite, and the proportion of the montmorillonite to the inorganic antibacterial component is preferably 2:1 to 10: 1; the granularity of montmorillonite is 300-1000 meshes, and the chemical composition is SiO250 to 70 mass% of Al2O3The content is 10 to 20 mass%. . CarrierThe addition of the inorganic antibacterial agent can improve the synergistic effect among different inorganic antibacterial components, improve the dispersibility and activity of the antibacterial components in a gypsum system and increase the antibacterial efficiency.
The action mechanism of the inorganic antibacterial component is as follows: 1. metal ions in the inorganic antibacterial component can enter microbial cells to inactivate most enzymes, and can also be combined with nucleic acid to destroy the division and reproduction capability of the cells; 2. titanium oxide and zinc oxide have photocatalytic activity, and react with water or hydroxyl to generate hydroxyl with strong oxidizing property to kill pathogenic microorganisms, thereby achieving the antibacterial effect.
The further technical scheme is that the deacetylation degree of the chitosan is more than or equal to 80%, and the relative molecular mass is 30000-50000. Chitosan belongs to an organic natural antibacterial component. The action mechanism of the organic antibacterial component is as follows: 1. through chemical reaction, cell membranes are damaged, protein is denatured, metabolism is hindered, and therefore the effects of sterilization and mildew prevention are achieved; 2. penetrate into the microbial cells of the disease bacteria to adsorb anionic substances, so that the physiological activity of the microbial cells is abnormal, and the antibacterial effect is achieved.
The composite use of the organic natural antibacterial component and the inorganic antibacterial component can destroy the structure and reproductive capacity of the mildew cells through physical and chemical actions to kill the cells, thereby achieving the aim of high-efficiency antibacterial.
The further technical scheme is that the sodium methyl silicate is an organic silicon waterproof agent solution, and the solid content is more than or equal to 25 percent; the solid content of the silicone-acrylate emulsion is more than or equal to 50 percent, and the viscosity is more than or equal to 2000mPa & s. The sodium methyl silicate and the silicone acrylic emulsion belong to waterproof components, the addition of the sodium methyl silicate and the silicone acrylic emulsion can endow the mildew preventive with a waterproof function, and the waterproof mechanism of the mildew preventive in gypsum is as follows: the silanol groups, carboxyl groups and other groups in the sodium silyl can generate dehydration crosslinking reaction with hydrophilic groups on the surface of the gypsum, the hydrophobic groups face outwards, and a closed hydrophobic film is gradually formed on the surface of the gypsum crystal along with the progress of the hydration reaction of the gypsum, so that the surface energy of the gypsum is changed, and the invasion of moisture is hindered; the silicone-acrylate emulsion can also play a role in forming a film or filling pores, and the waterproof performance is improved. The sodium methyl silicate and the silicone-acrylate emulsion can obviously improve the water resistance of the gypsum, reduce the water absorption of the gypsum product, keep the gypsum at low humidity and solve the problem that the interior of the gypsum product is easy to form a suitable mold living environment.
The further technical scheme is that the pH regulator is chemically-analytically pure-grade sodium bicarbonate or anhydrous disodium hydrogen phosphate, and the purity of the pH regulator is more than 99%. Most bacteria have the optimum living environment pH value of 6-7, and the pH value of a gypsum system is adjusted to 7-10 by adopting a pH regulator, so that the survival of the bacteria can be inhibited to a certain extent, and even some acidophilic microorganisms can die. Changes in pH can have the following effects on bacterial survival: 1. affecting the activity of bacterial cell membrane protein and extracellular hydrolase, thereby affecting the normal absorption and operation of nutrient substances; 2. affecting the property of the surface charge of the cell membrane and the permeability of the membrane, and further affecting the absorption capacity of bacteria to substances.
In addition, the used waterproof component does not hydrolyze or slowly hydrolyzes in an acid environment, and the pH value of the gypsum system is adjusted to be alkaline by using the pH regulator, so that the hydrolysis of the waterproof component and the dehydration crosslinking reaction between the waterproof component and the hydrophilic groups of the gypsum can be promoted, the film forming effect of a hydrophobic film is improved, and the improvement on the water resistance and the mildew resistance of the gypsum is facilitated.
The sodium dodecyl sulfate is a chemical analysis pure grade, has the purity of more than 99 percent, is a surfactant, has two opposite properties of lipophilicity and hydrophilicity in molecules, can uniformly disperse waterproof components and antibacterial components in the gypsum, and further improves the antibacterial and waterproof effects of the gypsum.
The further technical scheme is that the gypsum composite mildew preventive with the waterproof function is prepared by the following steps:
(1) treatment of montmorillonite
Sodium modification: preparing 1-3 mol/L NaCl solution as a modifier, mixing NaCl and montmorillonite in a mass ratio of 10:1, stirring in a water bath at a constant temperature of 75-85 ℃ for 0.7-2 h at a rotating speed of 2000-4000 r/min, standing for 24h, centrifuging the obtained product at a high speed for 15-20 min in a centrifugal machine, removing supernatant, washing with distilled water for centrifuging for 2-4 times, drying by a blower at 50 ℃ to constant weight, grinding and sieving to obtain the modified sodium-based montmorillonite powder with the mesh number of 300-1000 meshes.
Roasting: roasting the modified sodium-based montmorillonite powder at 150-250 ℃ for 2-3 h, and taking out to obtain the montmorillonite for later use.
The montmorillonite chemical composition SiO selected by the invention250 to 70 mass% of Al2O3The content is 10 to 20 mass%.
(2) Preparation of boric acid solution
Slowly pouring 1-3 parts of borax into water under a low-speed stirrer of 800-1200 r/min, and stirring for 10-15 min to prepare a boric acid solution with the concentration of 10000-11000 mg/L.
(3) Preparation of inorganic antibacterial component
Adding 1-3 parts of nano silver and 1-5 parts of nano titanium dioxide into a boric acid solution, stirring and mixing for 15-20 min on a magnetic stirrer, placing in an ultrasonic cleaner, and carrying out ultrasonic treatment for 15min under the condition of ultrasonic power of 300-330W to uniformly disperse the nano silver and the nano titanium dioxide in the boric acid solution.
Adding the treated montmorillonite into a boric acid solution mixed with nano silver and nano titanium dioxide, and stirring for 2-3 h at the speed of 100-200 r/min to prepare the inorganic antibacterial component, wherein the ratio of montmorillonite to nano silver, nano titanium dioxide and borax is 2: 1-10: 1.
(4) Preparation of chitosan antibacterial agent
Adding 3-8 parts of chitosan into 400-500 ml of dilute acetic acid solution with the mass fraction of 0.2% -0.3%, uniformly stirring at room temperature, and dissolving for 7-8 h to obtain a chitosan solution. And (3) dropwise adding a sodium hydroxide solution with the mass fraction of 0.2% into the chitosan solution to adjust the pH to 7-8, separating out the chitosan sol from the solution, and changing the solution from clarification to a white emulsion. And carrying out suction filtration on the white emulsion to obtain the chitosan antibacterial agent.
(5) Preparation of composite mildew preventive
Mixing the previously prepared chitosan antibacterial agent and inorganic antibacterial component with 3-7 parts of sodium methyl silicate, 4-14 parts of silicone-acrylic emulsion and 0.1-1 part of lauryl sodium sulfate, stirring for 15-30 min in a stirrer at 20-25 ℃ and 4000-6000 r/min to obtain a mixed solution with good adaptability, aging the mixed solution for 24h at normal temperature, and obtaining the gypsum composite mildew preventive with the waterproof function without layering and agglomeration.
The further technical scheme is that the mass ratio of the gypsum composite mildew preventive with the waterproof function to gypsum is 1: 90-1: 100, and the pH of gypsum slurry is regulated to 7-10 by a pH regulator.
A gypsum composite mildew preventive with a waterproof function comprises the following steps:
(1) adding the gypsum composite mildew inhibitor with the waterproof function into mixing water, and uniformly stirring to obtain a solution A;
(2) adding the solution A into gypsum, uniformly stirring to obtain gypsum slurry, testing the pH value of the slurry, adding a pH regulator into the slurry, continuously stirring, and regulating the pH value of the gypsum slurry to 7-10;
(3) and (3) putting the gypsum slurry with the pH value adjusted to a proper range into a mold, removing the mold after 24 hours, and drying at 40-50 ℃ to constant weight to obtain the gypsum product with the waterproof and mildew-proof functions.
The invention has the beneficial effects that:
(1) the gypsum composite mildew inhibitor with the waterproof function can effectively solve the problem that gypsum is easy to mildew, enables the mildew-proof effect of the gypsum to reach 0 level, simultaneously improves the water resistance of the gypsum, enables water drops to reach the lotus leaf hydrophobic effect on a gypsum matrix, improves the saturated water absorption rate by more than 5 times compared with common gypsum, and enables the softening coefficient to reach more than 0.86.
(2) The gypsum composite mildew preventive with the waterproof function is prepared by compounding an organic antibacterial component and an inorganic antibacterial component, and the cell structure and the reproductive capacity of the mould are destroyed through physical and chemical actions to cause cell death, so that the aim of high-efficiency antibiosis is fulfilled; the use of the waterproof component effectively avoids the environment suitable for the existence of the mould easily formed inside the gypsum product; the surfactant is adopted to uniformly disperse the waterproof component and the antibacterial component in the gypsum, so that the mildew resistance of the gypsum is further improved.
(3) The gypsum composite mildew inhibitor with the waterproof function contains a pH regulator, the pH value of gypsum slurry can be regulated to 7-10, and the pH value environment has inhibiting effect on the survival of most bacteria; and the alkaline environment is favorable for the formation of a hydrophobic film of the waterproof component in the gypsum, and the water resistance and the mildew resistance of the gypsum are improved.
(4) The preparation method and the application method of the gypsum composite mildew inhibitor with the waterproof function are simple and easy to operate, and can be widely applied to various gypsum products, so that the durability and the aesthetic degree of the gypsum products are improved, the gypsum can be used in the moisture-prone areas such as kitchens, bathrooms and the like, and the application range of the related gypsum products is widened.
Drawings
FIG. 1 is a graph of the mold test 180d for various comparative and example tests.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Comparative group 1
The comparative group 1 consists of the following components in mass fraction: 100 parts of gypsum and 60 parts of water. Stirring water and gypsum until the mixture is uniform, forming, maintaining, and observing the mildew condition of the sample under the environment that the relative humidity is more than 60%. The results show that the sample without the mildew preventive has mildew after half a year, and the comparative group 1 has obvious mildew.
Comparative group 2
The comparative group 2 consists of the following components in mass fraction: 4 parts of inorganic antibacterial component, 4 parts of chitosan, 5 parts of sodium methyl silicate, 13 parts of silicone-acrylic emulsion, 1.5 parts of sodium bicarbonate and 1 part of sodium dodecyl sulfate. Wherein the inorganic antibacterial component comprises 1 part of borax, 2 parts of nano titanium dioxide and 12 parts of montmorillonite.
Comparative group 3
The comparative group 3 consists of the following components in mass fraction: 4 parts of inorganic antibacterial component, 4 parts of chitosan, 5 parts of sodium methyl silicate, 13 parts of silicone-acrylic emulsion, 1.5 parts of sodium bicarbonate and 1 part of sodium dodecyl sulfate. Wherein the inorganic antibacterial component comprises 1 part of nano silver, 1 part of borax and 12 parts of montmorillonite.
Comparative group 4
The comparative group 4 consists of the following components in mass fraction: 4 parts of inorganic antibacterial component, 5 parts of sodium methyl silicate, 13 parts of silicone-acrylic emulsion, 1.5 parts of sodium bicarbonate and 1 part of sodium dodecyl sulfate. Wherein the inorganic antibacterial component comprises 1 part of nano silver, 1 part of borax, 2 parts of nano titanium dioxide and 12 parts of montmorillonite.
Comparative group 5
The comparative group 5 consists of the following components in mass fraction: 4 parts of inorganic antibacterial component, 4 parts of chitosan, 1.5 parts of sodium bicarbonate and 1 part of lauryl sodium sulfate. Wherein the inorganic antibacterial component comprises 1 part of nano silver, 1 part of borax, 2 parts of nano titanium dioxide and 12 parts of montmorillonite.
Comparative group 6
The comparative group 6 consists of the following components in mass fraction: 5 parts of sodium methylsilicate, 13 parts of silicone-acrylic emulsion, 1.5 parts of sodium bicarbonate and 1 part of sodium dodecyl sulfate.
Example 1
The gypsum composite mildew inhibitor with the waterproof function comprises the following components in percentage by mass: 4 parts of inorganic antibacterial component, 4 parts of chitosan, 5 parts of sodium methyl silicate, 13 parts of silicone-acrylic emulsion, 1.5 parts of sodium bicarbonate and 1 part of sodium dodecyl sulfate. Wherein the inorganic antibacterial component comprises 1 part of nano silver, 1 part of borax, 2 parts of nano titanium dioxide and 12 parts of montmorillonite.
Example 2
The gypsum composite mildew inhibitor with the waterproof function comprises the following components in percentage by mass: 3 parts of inorganic antibacterial component, 3 parts of chitosan, 3 parts of sodium methyl silicate, 4 parts of silicone-acrylic emulsion, 0.1 part of sodium dodecyl sulfate and 0.2 part of sodium bicarbonate. Wherein the inorganic antibacterial component comprises 1 part of nano silver, 1 part of borax, 1 part of nano titanium dioxide and 6 parts of montmorillonite.
Example 3
The gypsum composite mildew inhibitor with the waterproof function comprises the following components in percentage by mass: 8 parts of inorganic antibacterial component, 8 parts of chitosan, 7 parts of sodium methyl silicate, 14 parts of silicone-acrylic emulsion, 2 parts of anhydrous disodium hydrogen phosphate and 1 part of sodium dodecyl sulfate. Wherein the inorganic antibacterial component comprises 2 parts of nano silver, 1 part of borax, 5 parts of nano titanium dioxide and 40 parts of montmorillonite.
Example 4
The gypsum composite mildew inhibitor with the waterproof function comprises the following components in percentage by mass: 6 parts of inorganic antibacterial component, 6 parts of chitosan, 5 parts of sodium methylsilicate, 8 parts of silicone-acrylic emulsion, 1 part of sodium bicarbonate and 0.8 part of sodium dodecyl sulfate. Wherein the inorganic antibacterial component comprises 1 part of nano silver, 2 parts of borax, 3 parts of nano titanium dioxide and 24 parts of montmorillonite.
The preparation method of the gypsum composite mildew inhibitor with the waterproof function in the comparative groups 2-6 and the embodiments 1-4 comprises the following steps:
(1) Treatment of montmorillonite
Sodium modification: preparing 1mol/L NaCl solution as a modifier, mixing NaCl and montmorillonite in a mass ratio of 10:1, stirring in a water bath at a constant temperature of 80 ℃ for 1h at a rotating speed of 3000r/min, standing for 24h, centrifuging the obtained product at a high speed for 20min in a centrifugal machine, discarding supernatant, washing and centrifuging for 2 times with distilled water, drying by a blower at 50 ℃ to constant weight, grinding and sieving to obtain the modified sodium-based montmorillonite powder with the mesh number of 500-700.
Roasting: roasting the modified sodium-based montmorillonite powder at 200 ℃ for 2.5h, and taking out the modified sodium-based montmorillonite powder to obtain the montmorillonite for later use.
The montmorillonite chemical composition SiO selected by the invention260% by mass of Al2O3The content was 15% by mass.
(2) Preparation of boric acid solution
Slowly pouring borax into water under a low-speed stirrer of 900r/min, and stirring for 15min to prepare boric acid solution with concentration of 10000 mg/L.
(3) Preparation of inorganic antibacterial component
Adding nano silver and nano titanium dioxide into a boric acid solution, stirring and mixing for 15min on a magnetic stirrer, placing in an ultrasonic cleaning instrument, and carrying out ultrasonic treatment for 15min under the condition of ultrasonic power of 320W, so that the nano silver and the nano titanium dioxide are uniformly dispersed in the boric acid solution.
Adding the treated montmorillonite into boric acid solution mixed with nano silver and nano titanium dioxide, and stirring for 2h at 200r/min to obtain inorganic antibacterial component.
(4) Preparation of chitosan antibacterial agent
Adding chitosan into 500ml of dilute acetic acid solution with the mass fraction of 0.3%, stirring uniformly at room temperature, and dissolving for 8 hours to obtain a chitosan solution. And (3) dropwise adding a sodium hydroxide solution with the mass fraction of 0.2% into the chitosan solution to adjust the pH to 7.5, separating out the chitosan sol from the solution, and changing the solution from clarification to a white emulsion. And carrying out suction filtration on the white emulsion to obtain the chitosan antibacterial agent.
(5) Preparation of composite mildew preventive
Mixing the previously prepared chitosan antibacterial agent, the inorganic antibacterial component, sodium methyl silicate, silicone-acrylic emulsion and sodium dodecyl sulfate, stirring for 20min in a stirrer at 22 ℃ and 5000r/min to obtain a mixed solution with good adaptability, and aging the mixed solution for 24h at normal temperature without layering and agglomeration to obtain the gypsum composite mildew preventive with the waterproof function.
The further technical scheme is that the mass ratio of the gypsum composite mildew preventive with the waterproof function to gypsum is 1:97, and the pH of gypsum slurry is regulated to 7-10 through a pH regulator.
The application method of the gypsum composite mildew inhibitor with the waterproof function in the comparison groups 2-6 and the embodiments 1-4 comprises the following steps:
(1) Adding the gypsum composite mildew inhibitor with the waterproof function into mixing water, and stirring for 2min to obtain a solution A; (2) adding the solution A into gypsum, stirring for 1.5 minutes to obtain gypsum slurry, testing the pH value of the slurry, adding a pH regulator into the slurry, and continuously stirring uniformly, wherein the mass ratio of the gypsum composite mildew preventive with the waterproof function to the gypsum is 1: 90; (3) filling the gypsum slurry into a mold, removing the mold after 24 hours, and drying at 45 ℃ to constant weight to obtain a gypsum product with waterproof and mildew-proof functions; (4) and (3) placing the prepared gypsum test piece with the waterproof and mildewproof functions in an environment with the relative humidity of more than 60%, and observing the mildewing condition.
The results of the performance tests of the comparative groups 1 to 6 and examples 1 to 4 are shown in table 1, and the pictures of the mold tests are shown in fig. 1. The mold test refers to a paint film mold resistance determination method of standard GB/T1741-2007.
Table 1 results of performance testing
In summary, the comparative example 1 is not added with the antibacterial component and the waterproof component, the mold production speed is fast, the mold-proof grade is only 4 grade, the comparative example 5 is only added with the inorganic antibacterial component and the organic antibacterial component, and the waterproof component is not added for compounding, the mold-proof effect is better, the inorganic antibacterial component and the organic antibacterial component have certain effect on killing the mold, but the mold-proof grade is still 2 grade, the mold starts to grow on the edge of the gypsum after 180 days, the mold-proof effect is not particularly remarkable, the mold-proof effect and the mold-proof grade are almost the same in the comparative examples 2-6, no matter the inorganic antibacterial component and the organic antibacterial component are used for compounding the antibacterial, or only the waterproof component is used for waterproofing, the mold-proof grade is 2 grade, the inorganic antibacterial component, the organic antibacterial component and the waterproof component are compounded innovatively, as can be seen in the examples 1-4, the mildew of the gypsum is hardly grown on the surface of the gypsum after 180 days, the technical effect that a single component is not purposeful is achieved through the compounding, coordination and synergism of the inorganic antibacterial component, the organic antibacterial component and the waterproof component, the mildew-proof grade can reach 0 grade, the mildew-proof effect is outstanding, compared with the compounding of the inorganic antibacterial component and the organic antibacterial component for resisting bacteria or the waterproofing of the waterproof component, the mildew-proof effect of the gypsum-containing composite antibacterial agent is remarkably improved, the mildew-proof agent prepared by the method can prevent the gypsum product from easily generating mildew in a humid environment, the mildew-proof performance of the gypsum is remarkably improved, and the preparation method and the application method are simple and easy to operate.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (10)
1. The preparation method and the application method of the gypsum composite mildew inhibitor with the waterproof function are characterized by comprising the following components in parts by weight: 3-8 parts of inorganic antibacterial component, 3-8 parts of chitosan, 3-7 parts of sodium methyl silicate, 4-14 parts of silicone-acrylic emulsion, 0.2-2 parts of pH regulator and 0.1-1 part of sodium dodecyl sulfate; the inorganic antibacterial component comprises 1-3 parts of nano silver, 1-3 parts of borax and 1-5 parts of nano titanium dioxide.
2. The preparation method and the application method of the gypsum composite mildew preventive with the waterproof function of claim 1, wherein the nano titanium dioxide is lipophilic nano titanium dioxide, the crystal form is anatase type, the particle size is 30-60 nm, and the purity is more than 99.5%.
3. The preparation method and the application method of the gypsum composite mildewcide with the waterproof function according to claim 1, wherein the nano silver is wet nano silver powder with the purity of more than 99%, and the particle size is 15-30 nm.
4. The method for preparing and using the gypsum composite mildewcide with the waterproof function according to claim 1, wherein the inorganic antibacterial component further comprises a carrier, the carrier is montmorillonite, and preferably the ratio of the montmorillonite to the inorganic antibacterial component is 2:1 to 10: 1; the granularity of montmorillonite is 300-1000 meshes, and the chemical composition is SiO250 to 70 mass% of Al2O3The content is 10 to 20 mass%.
5. The preparation method and the application method of the gypsum composite mildewcide with the waterproof function according to claim 1, wherein the deacetylation degree of the chitosan is more than or equal to 80 percent, and the relative molecular mass is 30000-50000.
6. The preparation method and the application method of the gypsum composite mildewcide with the waterproof function according to claim 1 are characterized in that the sodium methyl silicate is an organic silicon waterproof agent solution, and the solid content is more than or equal to 25 percent; the solid content of the silicone-acrylate emulsion is more than or equal to 50 percent, and the viscosity is more than or equal to 2000mPa & s.
7. The preparation method and the application method of the gypsum composite mildewcide with the waterproof function according to claim 1, wherein the pH regulator is chemically pure sodium bicarbonate or anhydrous disodium hydrogen phosphate, and the purity of the pH regulator is more than 99%.
8. The gypsum composite mildewcide with waterproof function according to any one of claims 1 to 7, wherein the preparation method comprises the following steps:
(1) treatment of montmorillonite: sodium modification: preparing 1-3 mol/L NaCl solution as a modifier, mixing NaCl and montmorillonite in a mass ratio of 10:1, stirring in a water bath at a constant temperature of 75-85 ℃ for 0.7-2 h at a rotating speed of 2000-4000 r/min, standing for 24h, centrifuging the obtained product at a high speed for 15-20 min in a centrifuge, removing supernatant, washing with distilled water for centrifuging for 2-4 times, drying by a blower at 50 ℃ to constant weight, grinding and sieving to prepare modified sodium-based montmorillonite powder with the mesh number of 300-1000 meshes; ② roasting: roasting the modified sodium-based montmorillonite powder at 150-250 ℃ for 2-3 h, and taking out to obtain montmorillonite for later use;
(2) preparing a boric acid solution: slowly pouring 1-3 parts of borax into water under a low-speed stirrer of 800-1200 r/min, and stirring for 10-15 min to prepare a boric acid solution with the concentration of 10000-11000 mg/L;
(3) preparation of inorganic antibacterial component: adding 1-3 parts of nano silver and 1-5 parts of nano titanium dioxide into a boric acid solution, stirring and mixing for 15-20 min on a magnetic stirrer, placing in an ultrasonic cleaner, and carrying out ultrasonic treatment for 15min under the condition of ultrasonic power of 300-330W to uniformly disperse the nano silver and the nano titanium dioxide in the boric acid solution; secondly, adding the treated montmorillonite into boric acid solution mixed with nano silver and nano titanium dioxide, and stirring for 2-3 hours at the speed of 100-200 r/min to prepare an inorganic antibacterial component, wherein the ratio of the montmorillonite to the nano silver, the nano titanium dioxide and the borax is 2: 1-10: 1;
(4) Preparing a chitosan antibacterial agent: adding 3-8 parts of chitosan into 400-500 ml of dilute acetic acid solution with the mass fraction of 0.2% -0.3%, uniformly stirring at room temperature, and dissolving for 7-8 h to obtain a chitosan solution; dropwise adding a sodium hydroxide solution with the mass fraction of 0.2% into the chitosan solution to adjust the pH value to 7-8, separating out the chitosan sol from the solution, and changing the solution from clarification to a white emulsion; carrying out suction filtration on the white emulsion to obtain a chitosan antibacterial agent;
(5) preparing a composite mildew preventive: mixing the previously prepared chitosan antibacterial agent and inorganic antibacterial component with 3-7 parts of sodium methyl silicate, 4-14 parts of silicone-acrylic emulsion and 0.1-1 part of lauryl sodium sulfate, stirring for 15-30 min in a stirrer at 20-25 ℃ and 4000-6000 r/min to obtain a mixed solution with good adaptability, aging the mixed solution for 24h at normal temperature, and obtaining the gypsum composite mildew preventive with the waterproof function without layering and agglomeration.
9. The application method of the waterproof gypsum composite mildewcide according to any one of claims 1 to 7, wherein the mass ratio of the waterproof gypsum composite mildewcide to the gypsum is 1:90 to 1:100, and the pH of the gypsum slurry is adjusted to 7 to 10 by a pH regulator.
10. The method for applying the gypsum composite mildewcide with waterproof function according to any one of claims 1 to 7, comprising the following steps of: (1) adding the gypsum composite mildew inhibitor with the waterproof function into mixing water, and uniformly stirring to obtain a solution A; (2) adding the solution A into gypsum, uniformly stirring to obtain gypsum slurry, testing the pH value of the slurry, adding a pH regulator into the slurry, continuously stirring, and regulating the pH value of the gypsum slurry to 7-10; (3) and (3) putting the gypsum slurry with the pH value adjusted to a proper range into a mold, removing the mold after 24 hours, and drying at 40-50 ℃ to constant weight to obtain the gypsum product with the waterproof and mildew-proof functions.
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