CN111848102A - A kind of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint and preparation method thereof - Google Patents

Abstract

The invention discloses a high-efficiency mildew-proof bactericidal fireproof interior wall paint and a preparation method thereof, belonging to the field of inorganic coatings. The interior wall paint comprises the following components in parts by weight: 30-40 parts of inorganic powder; 10-15 parts of titanium dioxide; 30-40 parts of potassium silicate; 0.1-0.3 part of silver ion bactericide; 0.4-0.5 part of cellulose; 0.1-1 part of a dispersant; 0.1-1 part of wetting agent; 0.1-0.5 part of defoaming agent; 10-20 parts of water. The preparation method comprises the following steps: adding a defined amount of a dispersing agent, a wetting agent and a defoaming agent into a defined amount of water in sequence; under the condition of stirring, adding specified amounts of titanium dioxide, inorganic powder and cellulose, and increasing the stirring speed; finally, adding specified amount of potassium silicate and silver ion bactericide, and stirring. The inorganic coating does not contain volatile organic compounds, is an environment-friendly coating, has strong antibacterial effect and can meet the A-grade fireproof requirement.

Description

A kind of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint and preparation method thereof

technical field

The invention relates to the field of inorganic coatings, in particular to a high-efficiency mildew-proof, bactericidal, fire-proof interior wall paint and a preparation method thereof.

Background technique

Coatings refer to a class of materials used for building decoration or protection. Because of its light weight, good safety, bright colors, good decorative texture, convenient construction, easy maintenance, and energy saving, it has become an ideal building wall decoration material. At present, coatings are mainly divided into two categories: organic coatings and inorganic coatings. Organic coatings have been widely used with the development of petrochemical industry. They have good film-forming properties, good brushability, good flexibility and excellent decorative effects. Inorganic coatings refer to architectural decoration materials that use silicate inorganic polymer compounds as film-forming substances. Such film-forming substances are mainly alkali metal silicates or silica sols. Compared with organic coatings, this kind of architectural coatings using inorganic polymers as film-forming substances has excellent weather resistance and is very stable under the action of ultraviolet light; good heat resistance, non-flammable and smoke-free in case of fire; Good pollution resistance; it is not easy to absorb ash, and can maintain a bright decorative effect; no volatile organic compounds are produced during the production and use process, and it will not pollute the environment. , the application prospect is broad.

With the emergence of the new coronavirus pneumonia epidemic, consumers are more environmentally and health-conscious than ever. Due to the lack of functionality, organic coatings are easily polluted by moisture and water seepage in the environment. Bacteria will erode the wall to varying degrees. After being corroded by mold, the coating will fade, stain, and even fall off, and it has peculiar smell and formaldehyde, which is harmful to consumers. The health of the patients is threatened to varying degrees, and it is particularly easy to aggravate diseases such as breathing and leukemia. With the advancement of science and technology, there are more and more new functional coatings, but they often only focus on one or several aspects of deodorization, mildew resistance, sterilization, and fire prevention, and it is difficult to cover them all. For example, high-end latex paint can It can achieve the functions of deodorization, mildew prevention and sterilization, but the fire resistance is relatively poor; for example, inorganic coatings are better in terms of deodorization, mildew resistance and fire prevention, and have a certain antibacterial function, but the rapid killing effect of bacteria and viruses is relatively low. Difference.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the first objective of the present invention is to provide an efficient anti-mold, bactericidal and fire-resistant interior wall paint, which has the advantages of deodorization, anti-mold, sterilization and fire prevention at the same time.

The second objective of the present invention is to provide a preparation method for an efficient anti-mold, bactericidal and fireproof interior wall paint, so that a simple preparation method can obtain an interior wall paint with the advantages of deodorization, mildew resistance, sterilization and fire prevention at the same time.

The above-mentioned technical purpose of the present invention is achieved through the following technical solutions:

A high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint, comprising the following components by weight:

Inorganic powder 30-40 copies;

10-15 parts of titanium dioxide;

Potassium silicate 30-40 parts;

Silver ion fungicide 0.1-0.3 parts;

Cellulose 0.4-0.5 servings;

0.1-1 part of dispersant;

Wetting agent 0.1-1 part;

Defoamer 0.1-0.5 parts;

Water 10-20 parts.

By adopting the above technical solution, the wall surface coated with ordinary organic paint can become a breeding ground for the survival and mass reproduction of bacteria, molds and viruses under suitable temperature and humidity, which will cause great harm to the health of people living in the room. Long-term exposure to mold can cause respiratory diseases and allergic symptoms. People with low immunity may also cause headaches, fever, asthma, skin or mucous membrane inflammation, tonsillitis, and serious carcinogens. Especially in the hospital environment, the pathogenic bacteria mainly come from patients, and the patient population flows in large numbers. The pathogenic bacteria combine with the dust particles in the air of the hospital, attach to the wall, fly to the ground, and breed and multiply in a suitable environment. It is very easy. Re-spread to medical staff and patients who seek medical treatment. However, the coating of the present invention is pure inorganic coating, does not contain emulsion, prevents providing nutrients to bacteria and viruses, and will not affect physical health after long-term use.

At the same time, the coating of the present invention introduces an inorganic antibacterial agent to exert antibacterial and bactericidal effects. Antibacterial agents can be divided into four types: organic antibacterial agents, inorganic antibacterial agents, natural antibacterial agents and organic-inorganic composite antibacterial agents according to their different materials, of which the first two are the most commonly used. Organic antibacterial agents have good bactericidal effects on Shigella, Escherichia coli, and Staphylococcus aureus, and the bactericidal mechanisms of different organic antibacterial agents are different. However, compared with inorganic antibacterial agents, although the short-term sterilization effect is obvious, organic antibacterial agents have poor temperature resistance. Inorganic antibacterial agents combine the inherent stability of inorganic materials with the high efficiency and broad spectrum of antibacterial components, and successfully overcome the above shortcomings of organic antibacterial agents.

The selected antibacterial agent of the present invention belongs to the silver ion type inorganic antibacterial agent in the inorganic antibacterial agent, and the silver ion in the coating can be attached to the titanium dioxide to form an aqueous dispersion, and the silver ion and the cell wall/cell membrane rely on the charge to attract each other, and aggregate to form small particles; Then silver ions enter the interior of the cell, combine with protein (coagulation) and DNA, and erode cell viability; then silver ions cause morphological changes in the cell and erode the cell membrane, causing it to be separated from the cell wall, allowing the cytoplasm in the cell to flow out, So as to achieve the effect of sterilization. The inorganic antibacterial agent of the invention is a strong alkali-resistant high-efficiency broad-spectrum bactericide, which can quickly and effectively kill most bacteria and viruses for a long time under high temperature and high humidity conditions.

In addition, the inorganic coating of the present invention does not contain combustibles, and can meet the requirements of Class A fire protection. The paint film formed by the organic paint on the wall is combustible, which will burn in the event of a fire and release a large amount of toxic and harmful smoke.

The present invention is further provided that, the interior wall paint also includes the following components by weight:

Hydrotalcite 0.01-0.1 part;

Nano silicon carbide 3-8 copies;

1-5 parts of nano-magnesium oxide;

Magnetic graphene oxide 2-7 parts.

By adopting the above technical scheme, among the silver ion bactericides, the silver-loaded bactericide has better antibacterial effect, but the photosensitivity effect of silver is very strong and the stability is poor. The hydrotalcite of the present invention is a kind of hydroxide with rigid structure on the outside and anionic layered compound filled with anions inside. Insert various anions. The Ag ⁺ of the present invention can enter the interior of the hydrotalcite, thereby stabilizing the Ag ⁺ and improving the bactericidal effect of the bactericide.

In the present invention, nano silicon carbide is added, and in order to further enhance the bactericidal effect of the bactericide, the nano silicon carbide has a better bactericidal effect at a lower concentration. Due to the high surface activity of nano-silicon carbide, the strong lipid peroxide and damage antioxidant capacity can effectively destroy the permeability of bacterial cell membranes, resulting in bacterial metabolic dysfunction and eventually death, thereby achieving the effect of sterilization.

In the present invention, nano-magnesium oxide is further added to the inorganic coating, and the purpose is to further improve the sterilization effect of the coating. There are Fs ⁺ color centers on the surface of nano-MgO samples, and O ₂ ^- can be stably adsorbed on the defects generated by the edges and corners of MgO crystals, and form coordination structures with four or three Mg ²⁺ ; nano-MgO is produced in aqueous solution The OH ^- and O ₂ ^- can effectively kill S. aureus and B. subtilis ; O ₂ ^- can destroy the secondary phthalamide structure in the cell outer wall, thereby playing a role in killing bacteria. In addition, magnesium oxide can also be used as a refractory material, thereby enhancing the refractory performance of the coating of the present invention.

A part of Ag ⁺ of the present invention is combined with _TiO2 , and another part of Ag ⁺ is combined with magnetic graphene oxide to form a graphene-Ag composite material. In the graphene-Ag composite material, due to the large specific surface area of GO, Ag ⁺ is easily precipitated on the surface of GO. Therefore, GO can be well adsorbed on the surface of bacteria with Ag ⁺ , which improves the probability of contact between Ag and bacteria. , thereby greatly improving the antibacterial activity.

The present invention is further provided that the interior wall paint comprises the following components by weight:

Inorganic powder 32-38 parts;

11-14 parts of titanium dioxide;

Potassium silicate 32-38 parts;

Silver ion fungicide 0.1-0.3 parts;

Hydrotalcite 0.02-0.08 part;

Nano silicon carbide 4-7 copies;

2-4 parts of nano-magnesium oxide;

Magnetic graphene oxide 3-6 copies;

Cellulose 0.4-0.5 servings;

Dispersant 0.2-0.8 part;

Wetting agent 0.2-0.8 parts;

Defoamer 0.2-0.4 parts;

Water 12-18 parts.

The present invention further provides that the particle size of the hydrotalcite is 50-200 nm.

By adopting the above technical scheme, the present invention limits the particle size of the hydrotalcite to 50-200nm. On the one hand, the hydrotalcite with a particle size in the range of 50-200nm has the best effect of combining with ^Ag , and on the other hand, the particle size is After the hydrotalcite in the range of 50-200nm is combined with Ag ⁺ , the obtained composite can be better dispersed in the coating.

The present invention is further provided that the preparation method of the nano-magnesium oxide is as follows: respectively weighing a certain amount of Mg(NO ₃ ) ₂ ·6H ₂ O and anhydrous Na ₂ CO ₃ and dissolving in water, respectively preparing Mg ²⁺ The concentration ratio with CO ₃ ^2- solution is 1:2; after the two solutions are heated to 60-70 ℃, basic magnesium carbonate is prepared by nucleation/crystallization isolation method, washed and dried, and then calcined at 500-600 ℃ for 0.5 -1.5h, the preparation of nano-magnesium oxide.

The present invention further provides that the particle size of the nano-magnesium oxide is 20-45 nm.

By adopting the above technical scheme, the present invention limits the particle size of the nano-magnesium oxide to 20-45 nm, which can achieve a good sterilization effect. The bactericidal effect of nano-magnesium oxide decreased with the increase of particle size. And the particle size is too small, the sterilization effect is not ideal.

The present invention is further provided that the preparation method of the magnetic graphene oxide is as follows: dispersing 10-15 parts of graphene oxide in deionized water, then adding 0.1-0.3 parts of FeCl ₃ and 0.2-0.6 parts of FeCl ₂ , mixing uniformly, The pH is adjusted to 9-11, then heated to 80-90° C., stirred for 2-4 hours, cooled to room temperature, filtered, washed and dried to obtain magnetic graphene oxide.

By adopting the above-mentioned technical scheme, the above-mentioned preparation method can fully react graphene oxide with FeCl ₃ and FeCl ₂ , the prepared magnetic graphene oxide is compounded with ^Ag , and the probability of contact between ^Ag and bacteria is increased, thereby increasing the present invention Antibacterial properties of coatings.

The present invention is further provided that the preparation method of the nano silicon carbide is as follows: 300-350 parts of water, 40-60 parts of silicon carbide powder and 1-2 parts of silane coupling agent are mixed under vacuum conditions at a temperature of 4-9°C/min The heating rate is heated to 75-85°C and the reaction is stirred for 3-5.5h, then the reaction product is rapidly cooled to room temperature, and then vacuum filtered, washed and dried to obtain nano-silicon carbide after cooling.

By adopting the above technical solution, the preparation method of the above-mentioned nano-silicon carbide is simple, the operation is convenient, the addition of the silane coupling agent can improve the preparation success rate, and the prepared nano-silicon carbide has high surface activity, which can effectively destroy the permeability of bacterial cell membranes. Sex, leading to bacterial metabolic dysfunction and eventually death.

The present invention further provides that the dispersant is Nopco SN-5040. The inorganic powder, titanium dioxide, silver ion bactericide, hydrotalcite, nanometer silicon carbide, nanometer magnesium oxide, magnetic graphene oxide and cellulose of the present invention all have good dispersion effect in silicate.

The present invention further provides that the wetting agent is Huahan BL9. The wetting agent of the present invention can make the solid material more easily wetted by water. It wets the solid material by reducing its surface tension or interfacial tension, so that water can spread on the surface of the solid material or penetrate into its surface.

The present invention further provides that the defoamer is Aorun AF-34. The defoaming agent of the present invention can reduce the surface tension, inhibit the generation of foam or eliminate the generated foam during the preparation process of the coating.

The second purpose of the present invention is: to provide a kind of preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint, comprising the following steps:

a. Put 0.1-1 part of dispersant, 0.1-1 part of wetting agent and 0.1-0.5 part of defoamer into 10-20 parts of water in sequence, stir at 500-800r/min, and stir for 3-8min;

b. Under the stirring speed of 500-800r/min, add 10-15 parts of titanium dioxide, 30-40 parts of inorganic powder and 0.4-0.5 parts of cellulose, increase the stirring speed to 1200-1500r/min, and stir for 20-40min;

c. Add 30-40 parts of potassium silicate and 0.1-0.3 parts of silver ion bactericide, and stir at 600-1000r/min for 3-8min.

The present invention further provides that, in step b, 2-7 parts of magnetic graphene oxide, 0.01-0.1 parts of hydrotalcite, 3-8 parts of nanometer silicon carbide, and 1-5 parts of nanometer magnesium oxide are also added.

By adopting the above technical scheme, inorganic coatings with the advantages of clean smell, mildew resistance, sterilization and fire prevention can be produced simply and quickly. The pure inorganic coating prepared by the invention is especially suitable for the inner walls of public buildings such as hospitals, schools, libraries, etc., and can quickly and effectively kill the adhered bacteria, reduce the cross-infection of personnel and the bacterial adhesion in the environment, and ensure the safety of personnel .

To sum up, the present invention has the following beneficial effects:

1. The present invention is a pure inorganic coating, no volatile organic matter is produced in the preparation process, and it will not pollute the environment, so it is a kind of green and environment-friendly coating;

2. The inorganic antibacterial agent is added to the coating of the present invention, which has strong antibacterial effect, strong temperature resistance and long service life;

3. The coating of the present invention does not contain combustibles, and can meet the requirements of Class A fire protection, and nano-magnesium oxide is a refractory material, and its addition can increase the fire resistance of the coating of the present invention.

Detailed ways

The inorganic powder of the present invention is purchased from the active micropowder of Konaiou Trading (Shanghai) Co., Ltd.;

The scientific name of the titanium dioxide of the present invention is titanium dioxide, CAS: 13463-67-7;

Potassium silicate of the present invention is purchased from Konaiou Trading (Shanghai) Co., Ltd., model CB108;

The hydrotalcite of the present invention is purchased from Jingjiang Kanggaote Plastic Technology Co., Ltd., model FM300;

The silver ion bactericide of the present invention was purchased from Clariant Chemical (China) Co., Ltd., model LP 10.

The present invention will be described in further detail below in conjunction with the embodiments.

Example 1

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint, comprising the following steps:

a. Put 5g Nuopco SN-5040, 5g Huahan BL9 and 3g AF-34 into 150g water in sequence, stir at 700r/min, and stir for 5min;

b. At 700r/min stirring speed, add 120g titanium dioxide, 350g inorganic powder and 4.5g cellulose, increase the stirring speed to 1400r/min, and stir for 30min;

c. Add 350g potassium silicate and 2g silver ion bactericide, stir at 900r/min for 5min.

Example 2

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint, comprising the following steps:

a. Put 1g of Nopco SN-5040, 10g of Huahan BL9 and 1g of AF-34 into 100g of water in sequence, stir at 800r/min, and stir for 3min;

b. At 800r/min stirring speed, add 150g titanium dioxide, 300g inorganic powder, 70g magnetic graphene oxide, 1g hydrotalcite, 30g nano silicon carbide, 50g nano magnesium oxide and 5g cellulose, increase the stirring speed to 1200r/ min, stirring for 40min;

c. Add 300g potassium silicate and 1g silver ion bactericide, stir at 1000r/min for 3min.

The preparation method of the nano-magnesium oxide is as follows: respectively weighing a certain amount of Mg(NO ₃ ) ₂ ·6H ₂ O and anhydrous Na ₂ CO ₃ to dissolve in water, and the concentration of Mg ²⁺ is 0.8mol·L ^- The salt solution of ¹ and the alkali solution with a concentration of CO ₃ ^2- of 1.6 mol.L ^-1 ; after heating the two solutions to 60 ℃, basic magnesium carbonate was prepared by nucleation/crystallization isolation method, washed and dried in Baked at 600°C for 0.5h to prepare nano-magnesium oxide. The particle size of the prepared nano-magnesium oxide is 20 nm.

The preparation method of the magnetic graphene oxide is as follows: dispersing 100g graphene oxide in deionized water, then adding 3g FeCl ₃ and 2g FeCl ₂ , mixing evenly, adjusting the pH to 9, then heating to 80° C., stirring for 4 hours, and cooling to At room temperature, filter, wash and dry to obtain magnetic graphene oxide.

The preparation method of the nano-silicon carbide is as follows: heating 3000 g of water, 400 g of silicon carbide powder and 20 g of a silane coupling agent to 75° C. at a heating rate of 4° C./min under vacuum conditions and stirring and reacting for 5.5 hours, and then the reaction product is rapidly After cooling to room temperature, vacuum filtration, washing and drying are carried out to obtain nano silicon carbide after cooling.

Example 3

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint, comprising the following steps:

a. Put 10g Nuopco SN-5040, 1g Huahan BL9 and 5g AF-34 into 200g water in sequence, stir at 500r/min, and stir for 8min;

b. At 500r/min stirring speed, add 100g titanium dioxide, 400g inorganic powder, 20g magnetic graphene oxide, 0.1g hydrotalcite, 80g nano silicon carbide, 10g nano magnesium oxide and 4g cellulose, increase the stirring speed to 1500r /min, stirring for 20min;

c. Add 400g potassium silicate and 3g silver ion bactericide, stir at 600r/min for 8min.

The preparation method of the nano-magnesium oxide is as follows: respectively weighing a certain amount of Mg(NO ₃ ) ₂ ·6H ₂ O and anhydrous Na ₂ CO ₃ to dissolve in water, and the concentration of Mg ²⁺ is 0.7mol·L ^- The salt solution of ¹ and the alkali solution with a concentration of CO ₃ ^2- of 1.4mol.L ^-1 ; after heating the two solutions to 70 ℃, basic magnesium carbonate was prepared by nucleation/crystallization isolation method, washed and dried in Baked at 500°C for 1.5h to prepare nano-magnesium oxide. The particle size of the prepared nano-magnesium oxide is 45 nm.

The preparation method of the magnetic graphene oxide is as follows: disperse 150 g of graphene oxide in deionized water, then add 1 g of FeCl ₃ and 6 g of FeCl ₂ , mix evenly, adjust the pH to 11, then heat to 90° C., stir for 2 hours, and cool to At room temperature, filter, wash and dry to obtain magnetic graphene oxide.

The preparation method of the nano-silicon carbide is as follows: heating 3500g water, 600g silicon carbide powder and 10g silane coupling agent to 85°C at a heating rate of 9°C/min under vacuum conditions, stirring and reacting for 3 hours, and then rapidly cooling the reaction product After reaching room temperature, vacuum filtration, washing, drying, and cooling are performed to obtain nano-silicon carbide.

Example 4

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint, comprising the following steps:

a. Put 2g Nuopco SN-5040, 8g Huahan BL9 and 2g AF-34 into 120g water in sequence, stir at 700r/min, and stir for 4min;

b. At 700r/min stirring speed, add 110g titanium dioxide, 320g inorganic powder, 60g magnetic graphene oxide, 0.8g hydrotalcite, 40g nano silicon carbide, 40g nano magnesium oxide and 5g cellulose, increase the stirring speed to 1300r /min, stirring for 38min;

c. Add 320g potassium silicate and 1g silver ion bactericide, stir at 800r/min for 6min.

The preparation method of the nano-magnesium oxide is as follows: respectively weighing a certain amount of Mg(NO ₃ ) ₂ ·6H ₂ O and anhydrous Na ₂ CO ₃ to dissolve in water, and the concentration of Mg ²⁺ is 0.6mol·L ^- The salt solution of ¹ and the alkaline solution with a concentration of CO ₃ ^2- of 1.2 mol.L ^-1 ; after heating the two solutions to 66 ℃, basic magnesium carbonate was prepared by nucleation/crystallization isolation method, washed and dried in Baked at 540°C for 0.8h to prepare nano-magnesium oxide. The particle size of the prepared nano-magnesium oxide is 40 nm.

The preparation method of the magnetic graphene oxide is as follows: dispersing 120g graphene oxide in deionized water, then adding 1.5g FeCl ₃ and 5g FeCl ₂ , mixing evenly, adjusting the pH to 9, then heating to 88° C., stirring for 2.6 hours, and cooling to room temperature, filtered, washed and dried to obtain magnetic graphene oxide.

The preparation method of the nano-silicon carbide is as follows: heating 3400g water, 450g silicon carbide powder and 18g silane coupling agent to 82°C at a heating rate of 8°C min under vacuum conditions and stirring for 5h, and then rapidly cooling the reaction product to At room temperature, vacuum filtration, washing, drying, and cooling are performed to obtain nano-silicon carbide.

Example 5

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint, comprising the following steps:

a. Put 8g Nuopco SN-5040, 2g Huahan BL9 and 4g AF-34 into 180g water in sequence, stir at 600r/min, and stir for 6min;

b. At 600r/min stirring speed, add 140g titanium dioxide, 380g inorganic powder, 30g magnetic graphene oxide, 0.2g hydrotalcite, 70g nano silicon carbide, 20g nano magnesium oxide and 4g cellulose, increase the stirring speed to 1450r /min, stirring for 25min;

c. Add 380g potassium silicate and 3g silver ion bactericide, stir at 900r/min for 4min.

The preparation method of the nano-magnesium oxide is as follows: respectively weighing a certain amount of Mg(NO ₃ ) ₂ ·6H ₂ O and anhydrous Na ₂ CO ₃ to dissolve in water, and the concentration of Mg ²⁺ is 0.9mol·L ^- The salt solution of ¹ and the alkali solution with a concentration of CO ₃ ^2- of 1.8mol.L ^-1 ; after heating the two solutions to 64 ℃, basic magnesium carbonate was prepared by nucleation/crystallization isolation method, washed and dried in After calcining at 560°C for 1.2h, nano-magnesium oxide was prepared. The particle size of the prepared nano-magnesium oxide is 30 nm.

The preparation method of the magnetic graphene oxide is as follows: dispersing 140g graphene oxide in deionized water, then adding 2.5g FeCl ₃ and 3g FeCl ₂ , mixing evenly, adjusting the pH to 11, heating to 83° C., stirring for 3.8 hours, and cooling to room temperature, filtered, washed and dried to obtain magnetic graphene oxide.

The preparation method of the nano-silicon carbide is as follows: heating 3200 g of water, 550 g of silicon carbide powder and 12 g of a silane coupling agent to 78° C. at a heating rate of 5° C./min under vacuum conditions and stirring for 3.5 hours, and then the reaction product is rapidly After cooling to room temperature, vacuum filtration, washing and drying are carried out to obtain nano silicon carbide after cooling.

Comparative Example 1

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint is different from Example 1 in that no silver ion bactericide is added.

Comparative Example 2

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint, the difference from Example 2 is that magnetic graphene oxide is not added in step b.

Comparative Example 3

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint is different from Example 3 in that nano-silicon carbide is not added in step b.

Comparative Example 4

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint is different from Example 4 in that nano-magnesium oxide is not added in step b.

Comparative Example 5

A preparation method of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint, the difference from Example 5 is that hydrotalcite is not added in step b.

Comparative Example 6

The organic coating is prepared according to the technical scheme of the patent number 2015108037047 and the patent name is an organic coating.

Comparative Example 7

The organic coating is prepared according to the technical scheme of the patent number 2016107684504 and the patent name is an organic fluorine coating.

Performance Testing

The viscosity test in the examples and comparative examples of the present invention is determined by using the GB 1723-1979 standard.

The test of the contrast ratio in the embodiment of the present invention and the comparative example is determined by using the GB/T5211.17-1988 standard.

The scrub resistance test in the examples and comparative examples of the present invention is measured by ASTM D2486-17 "Standard Test Method for Scrub Resistance of Wall Coatings".

The 30-day thermal storage stability in the examples and comparative examples of the present invention was measured by GB/T 6753.3-1986 "Test method for storage stability of coatings".

The antibacterial properties, antibacterial durability properties and antifungal properties in the examples and comparative examples of the present invention were measured using HG/T3950-2007 "Antibacterial Paint".

The fire resistance in the examples and comparative examples of the present invention was measured by using GB8624-2012 and GB/T 20285-2006.

The VOCs in the examples and comparative examples of the present invention are measured by GB/T 29592-2013 "Method for Determination of Volatile Organic Compounds (VOC) and Aldehyde Compounds Released in Construction Adhesives".

The test results are shown in Table 1.

As can be seen from Table 1, the interior wall paints prepared in Examples 1-5 of the present invention all have antibacterial properties, antibacterial durability and mildew resistance, and in Example 2-5, hydrotalcite and nano-silicon carbide are added. After , nano-magnesium oxide and magnetic graphene oxide, the antibacterial effect is further enhanced by enhancing the stability of Ag ⁺ or the probability of Ag ⁺ contacting bacteria or destroying the cell membrane or cell wall of the bacteria. In addition, the interior wall paints prepared in Examples 1-5 of the present invention have good fire resistance, the fire rating is A, almost no combustion occurs, and the smoke toxicity is a safety first (AQ1). The interior wall paints prepared in Examples 1-5 of the present invention belong to inorganic coatings, wherein the antibacterial agent is selected from sterile antibacterial agents, and no VOC and macromolecular organic matter are detected, and they belong to green environmental protection coatings.

The difference between Comparative Example 1 and Example 1 is that it does not contain Ag ⁺ . As can be seen from Table 1, in Comparative Example 1, the antibacterial performance is 30.3%, the antibacterial durability is 25.8%, and the antifungal performance is grade 2, that is, the colony of mold spreads intermittently or is loosely distributed on the surface of the substrate, and the mold grows. account for less than 30% of the total area. This shows that Ag ⁺ has a very good bacteriostatic effect in the present invention. Ag ⁺ and cell wall/cell membrane rely on charge to attract, and then silver ions enter the interior of the cell, combine with protein (coagulation) and DNA, and destroy the cell membrane, so as to achieve bactericidal effect.

The difference between Comparative Example 2 and Example 2 is that no magnetic graphene oxide is added. As can be seen from Table 1, Comparative Example 2 has an antibacterial performance of 99.6% and an antibacterial durability of 98.7%, which is slightly lower than Example 2 in terms of antibacterial performance and antibacterial durability. This shows that the magnetic graphene oxide can be well adsorbed on the surface of bacteria with Ag ⁺ , which improves the probability of Ag contacting with bacteria, thereby greatly improving the antibacterial activity of interior wall paint.

The difference between Comparative Example 3 and Example 3 is that nano silicon carbide is not added. As can be seen from Table 1, the antibacterial performance of Comparative Example 3 is 99.3%, and the antibacterial durability is 96.4%, which is slightly lower than that of Example 3 in terms of antibacterial performance and antibacterial durability. This shows that the high surface activity of nano-silicon carbide can effectively destroy the permeability of bacterial cell membranes, leading to bacterial metabolic dysfunction and eventually death, and further improving the bactericidal effect of the interior wall paint of the present invention.

The difference between Comparative Example 4 and Example 4 is that nano-magnesium oxide is not added. As can be seen from Table 1, the antibacterial performance of Comparative Example 4 is 99.4%, and the antibacterial durability is 96.9%, which is slightly lower than that of Example 4 in terms of antibacterial performance and antibacterial durability. This indicates that the OH ^- and O ₂ ^- produced by nano-MgO in aqueous solution can destroy the cell structure, thereby killing bacteria.

The difference between Comparative Example 5 and Example 5 is that no hydrotalcite is added. As can be seen from Table 1, the antibacterial performance of Comparative Example 5 is 99.7%, and the antibacterial durability is 99.0%, which is slightly lower than that of Example 5 in terms of antibacterial performance and antibacterial durability. This shows that Ag ⁺ can enter the interior of the hydrotalcite, thereby stabilizing Ag ⁺ , thereby improving the bactericidal effect of the interior wall paint of the present invention.

Comparative Example 6 is an existing organic paint. As can be seen from Table 1, firstly, Comparative Example 6 is significantly lower than any of the embodiments of the present invention in terms of antibacterial performance, antibacterial durability, and antifungal performance, especially in antifungal performance, which belongs to 3 Grade, that is, the mold grows and reproduces in a large amount, accounting for less than 70% of the total area, and there is almost no bacteriostatic and bactericidal effect. Secondly, there is a large amount of organic matter in the coating composition of Comparative Example 6. In terms of fire resistance, it belongs to the B1 level, that is, the flame-retardant building material, and the smoke-producing toxicity belongs to the safety level 2 (AQ2), but it is lower than any implementation of the present invention. example. Finally, there are volatile organic compounds in the paint composition of Comparative Example 6, which will affect the health of users.

Comparative Example 7 is an existing organic fluorine-containing coating. As can be seen from Table 1, first of all, Comparative Example 7 is significantly lower than any of the embodiments of the present invention in terms of antibacterial performance, antibacterial durability, and antifungal performance, especially in antifungal performance, which belongs to 3 Grade, that is, the mold grows and reproduces in a large amount, accounting for less than 70% of the total area, and there is almost no bacteriostatic and bactericidal effect. Secondly, there is a large amount of organic matter in the coating composition of Comparative Example 7. In terms of fire resistance, it belongs to the B1 level, that is, a flame-retardant building material, and the smoke-producing toxicity belongs to the quasi-safety level (ZA1), but it is lower than any one of the present invention. Example. Finally, there are volatile organic compounds in the paint composition of Comparative Example 7, which will affect the health of users.

The embodiments of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered in within the protection scope of the present invention.

Claims (10)

1. an efficient anti-mildew sterilization fire-proof interior wall paint, is characterized in that: comprise the component of following weight portion: Inorganic powder 30-40 copies; 10-15 parts of titanium dioxide; Potassium silicate 30-40 parts; Silver ion fungicide 0.1-0.3 parts; Cellulose 0.4-0.5 servings; Dispersant 0.1-1 part; Wetting agent 0.1-1 part; Defoamer 0.1-0.5 parts; Water 10-20 parts. 2. a kind of high-efficiency anti-mildew sterilization fire-proof interior wall paint according to claim 1, is characterized in that: described interior wall paint also comprises the following components by weight: Hydrotalcite 0.01-0.1 part; Nano silicon carbide 3-8 copies; 1-5 parts of nano-magnesium oxide; Magnetic graphene oxide 2-7 parts. 3. a kind of high-efficiency anti-mildew sterilization fire-proof interior wall paint according to claim 2, is characterized in that: described interior wall paint comprises the following components by weight: Inorganic powder 32-38 parts; 11-14 parts of titanium dioxide; Potassium silicate 32-38 parts; Silver ion fungicide 0.1-0.3 parts; Hydrotalcite 0.02-0.08 part; Nano silicon carbide 4-7 copies; 2-4 parts of nano-magnesium oxide; Magnetic graphene oxide 3-6 copies; Cellulose 0.4-0.5 servings; Dispersant 0.2-0.8 part; Wetting agent 0.2-0.8 parts; Defoamer 0.2-0.4 parts; Water 12-18 parts. 4. A kind of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint according to claim 2 or 3, characterized in that: the particle size of the hydrotalcite is 50-200 nm. 5. a kind of high-efficiency mildew-proof, bactericidal and fire-proof interior wall paint according to claim 2 or 3, characterized in that: the preparation method of the nano-magnesium oxide is: respectively taking a certain amount of Mg(NO ₃ ) ₂ ·6H ₂ O and anhydrous Na ₂ CO ₃ are dissolved in water, and the concentration ratio of the respectively prepared Mg ^{2 +} and CO ₃ ^2- solutions is 1:2; The basic magnesium carbonate is prepared by chemical isolation method, washed and dried, and then calcined at 500-600° C. for 0.5-1.5 h to prepare nano-magnesium oxide. 6. A kind of high-efficiency anti-mold, bactericidal and fire-resistant interior wall paint according to claim 5, characterized in that: the particle size of the nano-magnesium oxide is 20-45 nm. 7. a kind of high-efficiency anti-mildew sterilization fireproof interior wall paint according to claim 2 or 3, is characterized in that: the preparation method of described magnetic graphene oxide is: 10-15 parts of graphene oxide are dispersed in deionized water , then add 0.1-0.3 parts of FeCl ₃ and 0.2-0.6 parts of FeCl ₂ , mix well, adjust pH to 9-11, then heat to 80-90 ° C, stir for 2-4 hours, cool to room temperature, filter, wash, dry , to obtain magnetic graphene oxide. 8. A kind of high-efficiency anti-mildew, sterilization and fire-proof interior wall paint according to claim 2 or 3, characterized in that: the preparation method of the nano-silicon carbide is: 300-350 parts of water, 40-60 parts of silicon carbide powder and 1-2 parts of silane coupling agent under vacuum conditions, heated to 75-85 ℃ at a heating rate of 4-9 ℃/min and stirred for 3-5.5 h, then the reaction product was rapidly cooled to room temperature, and then vacuum filtered. , washing, drying, and cooling to obtain nano-silicon carbide. 9. the preparation method of the high-efficiency mildew-proof, bactericidal, fire-proof interior wall paint described in any one of claim 1-8, is characterized in that: comprises the following steps: a. Put 0.1-1 part of dispersant, 0.1-1 part of wetting agent and 0.1-0.5 part of defoamer into 10-20 parts of water in sequence, stir at 500-800r/min, and stir for 3-8min; b. Under the stirring speed of 500-800r/min, add 10-15 parts of titanium dioxide, 30-40 parts of inorganic powder and 0.4-0.5 parts of cellulose, increase the stirring speed to 1200-1500r/min, and stir for 20-40min; c. Add 30-40 parts of potassium silicate and 0.1-0.3 parts of silver ion bactericide, and stir at 600-1000r/min for 3-8min. 10. the preparation method of a kind of high-efficiency anti-mildew sterilization fire-proof interior wall paint according to claim 9, is characterized in that: in step b, also add 2-7 parts of magnetic graphene oxide, 0.01-0.1 part of hydrotalcite, 3- 8 parts nano silicon carbide and 1-5 parts nano magnesium oxide.