CN114149701A

CN114149701A - Antiviral and formaldehyde-resistant A-grade fireproof interior wall coating and preparation method thereof

Info

Publication number: CN114149701A
Application number: CN202111468061.7A
Authority: CN
Inventors: 陈颖; 区英强; 蔡天康; 刘伟达; 陈文基
Original assignee: Guangdong Carpoly Science & Technology Material Co ltd
Current assignee: Guangdong Carpoly Science & Technology Material Co ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-03-08
Anticipated expiration: 2041-12-03
Also published as: CN114149701B

Abstract

The invention discloses an antiviral and formaldehyde-resistant A-grade fireproof interior wall coating and a preparation method thereof, wherein the antiviral and formaldehyde-resistant A-grade fireproof interior wall coating comprises the following components in parts by weight: comprises 20 to 30 portions of deionized water, 0.3 to 0.6 portion of cellulose, 0.3 to 0.6 portion of dispersant, 0.3 to 0.8 portion of antifreeze, 30 to 45 portions of modified calcined shell powder slurry with the solid content of 65 to 75 percent, 5 to 10 portions of titanium pigment, 10 to 15 portions of photocatalyst dispersion liquid, 5 to 17 portions of heavy calcium carbonate, 5 to 9 portions of acrylic emulsion, 0.1 to 0.5 portion of defoamer and 0.3 to 0.8 portion of film forming additive; has good antiviral and antibacterial properties and formaldehyde resistance, excellent fireproof performance and storage stability, and is odorless and environment-friendly.

Description

Antiviral and formaldehyde-resistant A-grade fireproof interior wall coating and preparation method thereof

Technical Field

The invention relates to the field of interior wall coatings, in particular to an antiviral and formaldehyde-resistant A-grade fireproof coating and a preparation method thereof.

Background

Along with the increasing epidemic diseases, the public attention to bacteria and viruses is increased, the spread speed of the viruses is very high in public places such as schools, hospitals, markets, restaurants and the like with large flow of people, the viruses are easy to cross-infect, and in addition, a lot of viruses can survive for a long time without hosts, so that the virus protection challenge is raised, the traditional indoor decoration material basically has no antiviral function, and the interior wall coating occupying most of the indoor decoration area has great significance if the interior wall coating has the antiviral function.

Formaldehyde is determined as a carcinogen by the world health organization, and the influence of formaldehyde on human health is mainly reflected in aspects of abnormal smell, stimulation, allergy, abnormal lung function, abnormal liver function, abnormal immune function and the like. When the indoor formaldehyde concentration reaches 0.1mg/m³In time, peculiar smell and uncomfortable feeling are generated; up to 0.5mg/m³It can stimulate eyes and cause lacrimation; up to 0.6mg/m³It can cause discomfort or pain in the throat; higher concentrations can cause nausea, vomiting, cough, chest distress, asthma and even pulmonary edema. The national standard stipulates that the safety value of the formaldehyde concentration of indoor air is 0.1mg/m³The formaldehyde concentration of the newly-decorated house is generally 0.3-0.6mg/m³Therefore, the product with the function of removing formaldehyde is selected to decorate the room, which is greatly helpful for purifying the formaldehyde in the room.

The conventional interior wall coating has high organic matter content and poor fireproof performance, can burn at high temperature, emits a lot of harmful gases and can accompany dense smoke, and in case of fire, the conventional interior wall coating causes great threat to escape of personnel. The regulations in the "interior decoration design fire protection code for buildings" approved by the Ministry of housing and urban and rural construction: a class A fireproof material is adopted in places such as the interior decoration of a windowless room, the ceiling of an evacuation staircase, the front room, the wall surface, the ground and the like.

CN 104592841A discloses an inorganic antibacterial aldehyde-removing paint and a preparation method thereof, wherein inorganic nano zinc oxide is adopted as a main functional material for antibacterial aldehyde removal, and the nano zinc oxide can decompose cell walls of bacteria under the catalysis of visible light and remove formaldehyde under the catalysis of the visible light. On one hand, the nano zinc oxide can play a catalytic role only under the condition of a light source, and the effect is greatly reduced under the condition without the light source; on the other hand, the dosage of the emulsion is 20-30 parts, the content of organic matters is very high, the requirement of fire-proof grade cannot be met, and the emulsion does not belong to the category of inorganic coating.

CN 10449109A discloses an antiviral natural paint and a preparation method thereof, wherein antiviral agents are prepared by using Chinese herbal medicines such as honeysuckle, forsythia, isatis root, dandelion, houttuynia and the like, and the antiviral agents are added into a coating to prepare the antiviral natural paint. On the one hand, the anti-virus mechanism of these herbs in humans is not necessarily suitable for use in paints; on the other hand, the long-acting properties of antiviral agents are also a great challenge.

CN 111333862A discloses an antiviral emulsion composition, a coating and a preparation method thereof, wherein an aqueous high polymer containing high content quaternary phosphonium salt unit is synthesized, and an inorganic metal nano composite material dispersion liquid is combined to prepare the antiviral emulsion composition. On one hand, the paint combines inorganic metal nano materials, and a plurality of metal ions have colors, so that the problem of color change of the paint is difficult to control while the antibacterial and antiviral properties of the paint are ensured; on the other hand, the coating prepared by the method does not have the functions of formaldehyde resistance and fire resistance.

The present invention also lists and contrasts some existing paint antiviral technologies, in combination with other data, summarized as follows: (1) the photocatalytic antibacterial antiviral material is prepared by reacting inorganic material with photocatalytic function with water or air under the action of light to generate superoxide radical O with high reactivity^2-And a reactive functional group such as hydroxyl radical OH, which reacts with microorganisms to produce CO₂And H₂O, thereby achieving the antibacterial and antiviral effects; (2) metal and its derivatives, the metal dissolving mechanism, namely in the antibacterial, antiviral agent use process, inorganic metal ion in antibacterial, antiviral material dissolve gradually, react with protein, nucleic acid in vivo of microorganism, functional group (such as sulfydryl and amino) containing sulfur, ammonia, thus produce antibacterial, antiviral effect; (3) natural antibacterial and antiviral material comprising plant source andanimal sources, mainly alkaloids, organic acids, phenols, volatile oil or high molecular protein and polysaccharide, wherein the molecules of the materials contain S (O) -S-bonds, which play a role in sulfur-containing substances in microbial cells, can inhibit and inhibit the normal metabolism of bacteria, and thus play a bactericidal role; (4) organic low-molecular antibacterial and antiviral materials, including quaternary ammonium salts, quaternary phosphonium salts, biguanides, alcohols, phenols, organic metals, pyridines, imidazoles and the like, wherein the antibacterial and antiviral mechanisms are mainly combined with anions on the surfaces of cell membranes of bacteria and molds or react with sulfydryl to destroy the synthetic system of proteins and the cell membranes, thereby inhibiting the propagation of the bacteria and the molds; (5) the organic high molecular antibacterial and antiviral material is obtained by introducing antibacterial and antiviral functional groups, wherein the antibacterial and antiviral functional groups can be introduced by homopolymerization or copolymerization of functional group monomers or by grafting, or a metal precursor is grafted into the structure of emulsion or resin.

However, different routes to antiviral technologies also present different problems, such as: photocatalysts, which must rely on light sources to function; metals and derivatives thereof can bring serious color change to the paint and also bring great challenges to the stability of the paint; natural antibacterial and antiviral materials, the extraction process is complex and the extraction efficiency is not high; the organic low-molecular antibacterial and antiviral material is easy to migrate to the surface of a paint film, and the long-acting property is insufficient; many organic polymer antibacterial and antiviral materials are not high temperature resistant, and the stability of emulsion or resin and the compatibility with a system when the emulsion or resin is applied in a coating are not good.

In the aspect of formaldehyde resistance of the coating, a plurality of reports are also provided at present, and the formaldehyde-resistant interior wall coating can be developed through different technical routes, mainly comprising 3 types of formaldehyde-resistant emulsion, photocatalyst photocatalytic materials added and other functional powder for adsorbing and decomposing formaldehyde.

CN 112521777A discloses an inorganic mineral shell powder coating with formaldehyde purification and decomposition functions, which utilizes the combination of a nano catalyst and shell powder to lead the shell powder to decompose formaldehyde into CO₂And H₂And O. However, the main component of the shell powder is carbonic acidCalcium, limited ability to decompose formaldehyde, and whose main component after sintering and aging is Ca (OH)₂,Ca²⁺Very readily with SiO₃ ^2-Reaction, resulting in a thick lump after the system.

Different formaldehyde-resistant technical routes also have respective problems, and by utilizing the acrylic emulsion, a plurality of organic matters are added, so that the fireproof performance of the product is poor; the photocatalyst catalytic material has the effect of resisting formaldehyde only under the condition of wide sources; the powder with other functions of adsorption and decomposition is added, a lot of powder only has the adsorption function and is released very subsequently, and the compatibility of the powder with the function of formaldehyde decomposition and a system is not good, so that the storage stability of the product is not good easily.

In the aspect of fireproof interior wall coatings, many interior wall inorganic coatings can meet the A-level fireproof requirement at present, but need to simultaneously achieve the A-level fireproof, antiviral and formaldehyde purification functions, and reports are not yet found at present, so that the development of an interior wall product with the fireproof performance, formaldehyde purification function and antiviral function is urgently needed.

Disclosure of Invention

Aiming at the problem of single function of the existing interior wall coating, the invention provides an antiviral and formaldehyde-resistant A-grade fireproof interior wall coating on the one hand, and the alkali-rich performance of the modified calcined shell powder is utilized to ensure that a paint film can keep high alkalinity and high alkalinity for a long time and inhibit microorganisms such as bacteria, mold and viruses from propagating and growing on the surface of the paint film so as to achieve the antibacterial and antiviral functions; the photocatalyst dispersion liquid and the acrylic emulsion are compounded, so that a paint film can continuously degrade formaldehyde in the presence or absence of a light source, the content of organic matters is reduced, and the modified calcined shell powder is used as a main film forming substance, so that the content of the organic matters in the whole paint is very low, and the A-level fireproof standard is reached.

The invention also provides a preparation method of the antiviral and formaldehyde-resistant A-grade fireproof coating, which is simple to operate, easy to control the process and stable in performance of the obtained coating.

In order to achieve the purpose, the technical scheme of the invention is as follows:

an antiviral and formaldehyde-resistant A-grade fireproof interior wall coating comprises the following components in parts by weight: comprises 20-30 parts of deionized water, 0.3-0.6 part of cellulose, 0.3-0.6 part of dispersing agent, 0.3-0.8 part of antifreezing agent, 30-45 parts of modified calcined shell powder slurry with the solid content of 65-75%, 5-10 parts of titanium dioxide, 10-15 parts of photocatalyst dispersion liquid, 5-17 parts of heavy calcium carbonate, 5-9 parts of acrylic emulsion, 0.1-0.5 part of defoaming agent and 0.3-0.8 part of film-forming auxiliary agent.

In the invention, the modified calcined shell powder slurry is prepared by the following method: carrying out surface coating treatment on the calcined shell powder by using a titanate coupling agent, and then carrying out emulsification treatment by using a surfactant for emulsifying the calcined shell powder; specifically, the following may be mentioned:

preparing calcined shell powder: calcining the shell powder at the temperature of 1000-1200 ℃, cooling after the calcination is completed, and then carrying out ball milling by using a ball mill;

aging of calcined shell powder: soaking calcined shell powder in deionized water for curing;

preparing an emulsion: mixing deionized water and a surfactant for emulsifying and calcining the shell powder, heating to 50-60 ℃, stirring for 58-62min, and keeping the system in a uniform state for later use;

surface modification calcined shell powder slurry: mixing deionized water and a titanate coupling agent, uniformly stirring, adding cured calcined shell powder, dispersing, coating the surface of the calcined shell powder, adding an emulsion for emulsification treatment, and passing through a 160-mesh filter cloth after dispersing to obtain the modified calcined shell powder slurry.

The calcined shell powder has high alkalinity and large surface energy, and is easily unstable when directly added into a coating system, and the method is mainly shown in the following aspects: 1. the calcined shell powder has high thixotropy and is difficult to disperse in the coating; 2. calcining the shell powder can rob an emulsifier on the surface of the latex particles, so that emulsion breaking is easily caused, and the whole system is damaged; 3. bare calcined shell powder vs. Mg²⁺、SiO₃ ^2-、Al³⁺Are sensitive and can react to cause flocculation and caking; the calcined shell powder is prepared by the following method: carrying out surface coating treatment on the calcined shell powder by using a titanate coupling agent, and then carrying out emulsification treatment by using a surfactant; the methodThe method does not destroy the alkali-rich performance of the calcined shell powder, and can reduce OH when added into water^-The burst release of the surfactant reduces the direct impact on the emulsion, and the coating of the surfactant can reduce the surface tension, improve the dispersibility, and increase the compatibility with other components and the long-term storage stability; the obtained modified calcined shell powder slurry has high strength porous structure and good water respiration function, and the main component of the modified calcined shell powder slurry is calcium hydroxide which is used as a main film forming substance and absorbs CO in the air₂And calcium carbonate is generated through reaction, the calcium carbonate is solidified to form a film, and after the film is formed, the pH value of the paint film can be ensured to be 11.5-12.5, and microorganisms such as bacteria, mould, viruses and the like can not be propagated and grown on the surface of the paint film, so that the paint film has good antibacterial and antiviral functions.

In the invention, the acrylic emulsion is prepared by the following method:

pre-emulsifying monomers: sequentially adding a hard monomer, a soft monomer, a functional monomer and an emulsifier into deionized water, heating to 73-75 ℃, and fully stirring to prepare a pre-emulsified monomer;

synthesizing a seed emulsion: mixing deionized water and 1/4 pre-emulsified monomers, heating to 78-80 ℃, adding 1/4 initiator, and initiating polymerization to obtain seed emulsion;

heating the seed emulsion to 81-83 ℃, uniformly dropwise adding 2/4 pre-emulsified monomers and 2/4 initiators into the seed emulsion at 81-83 ℃ within 3-3.5h, and mixing for polymerization;

heating to 85 ℃, dripping the remaining 1/4 pre-emulsified monomer and 1/4 initiator into the mixture within 1 hour, and preserving the temperature for 0.5 to 1 hour after the dripping is finished;

cooling to 63-65 deg.C, adding tert-butyl hydroperoxide and NaHSO₃Reducing the content of residual monomers, after 0.5-1h, reducing the temperature to 35-40 ℃, adjusting the PH to 7.5-8 by ammonia water, and filtering to obtain the acrylic emulsion.

Further, the functional monomer used in the process of preparing the acrylic emulsion is one of acetoacetoxy ethyl methacrylate (AAEMA), acrylamide or methacrylamide, preferably acetoacetoxy ethyl methacrylate (AAEMA).

In the invention, the photocatalyst dispersion liquid is prepared by the following method:

in deionized water, the photocatalyst is prepared by pre-dispersing with at least one nonionic surfactant, and the solid content in the photocatalyst dispersion liquid is more than 40%.

The photocatalyst dispersion liquid and the acrylic emulsion are compounded, the photocatalyst dispersion liquid decomposes formaldehyde under the condition of light, the acrylic emulsion can decompose formaldehyde under the conditions of light and no light, and the addition of the photocatalyst dispersion liquid can reduce the use amount of the acrylic emulsion and reduce the fire resistance to reach the A level because the acrylic emulsion is an organic matter, so the two are compounded and cooperated with each other to make up for the defects; and the alkali-rich performance of the modified calcined shell powder slurry can also stimulate the reducibility of formaldehyde, so that the formaldehyde is easier to be oxidized, and the modified calcined shell powder slurry, the photocatalyst dispersion liquid and the acrylic emulsion have a synergistic effect with each other, thereby achieving the A-grade fire prevention and simultaneously decomposing the formaldehyde under the condition of light or no light, and meeting the requirement of removing the formaldehyde.

In the invention, the surfactant used in the modification process of the calcined shell powder is sodium dodecyl sulfate or polyoxyethylene ether.

According to the invention, the rutile titanium dioxide which is prepared by a chlorination method and is not subjected to surface coating has good compatibility with the modified calcined shell powder, and is favorable for the long-term storage stability of the coating.

In the invention, the cellulose is selected from hydroxyethyl cellulose and/or hydroxypropyl methyl cellulose, preferably hydroxyethyl cellulose.

In the invention, the dispersant is polyacrylic acid sodium salt dispersant.

In the invention, the antifreezing agent is one of ethylene glycol, propylene glycol and surfactant type antifreezing agent, and propylene glycol is preferred.

In the invention, the defoaming agent is one or more of mineral oil, vegetable oil, polyether modified organic silicon and hydrocarbon, and strong hydrophobic mineral oil is preferred.

In the invention, the film-forming auxiliary agent is selected from alcohol ether and/or alcohol ester film-forming auxiliary agents, preferably alcohol ester film-forming auxiliary agents, and more preferably Iseman OE 300.

In the invention, the heavy calcium is selected as high as possible in purity, and Mg brought by impurities is selected as much as possible²⁺、Al³⁺It has a slight effect on the long-term stability of the system, preferably 1250 mesh.

A preparation method of an antiviral and formaldehyde-resistant A-grade fireproof interior wall coating comprises the following steps:

mixing deionized water and cellulose, fully stirring and dispersing, then adding a dispersing agent and an antifreezing agent, and uniformly stirring to obtain a mixed solution 1;

adding the modified calcined shell powder slurry, the titanium dioxide, the photocatalyst dispersion liquid and the heavy calcium into the mixed solution 1 in sequence, and dispersing until the fineness is less than 60um to obtain a mixed solution 2;

and (3) adding the acrylic emulsion, the defoaming agent and the film forming auxiliary agent into the mixed solution 2 in sequence, and stirring uniformly.

The invention has the beneficial effects that:

1. and (3) antibacterial and antiviral: the high alkalinity of the calcined shell powder is utilized to maintain the system in an alkali-rich state, and the porous structure of the calcined shell powder can ensure that the pH value of a paint film is 11.5-12.5 for a long time, microorganisms such as bacteria, molds, viruses and the like can not propagate and grow on the surface of the paint film, and the synergistic effect of the two functions is realized by the catalytic decomposition function of the photocatalyst, so that the paint film is further ensured to have good antibacterial and antiviral functions.

2. And (3) decomposing formaldehyde: the photocatalyst can generate a photocatalytic reaction similar to photosynthesis under the irradiation of light to generate free hydroxyl and active oxygen with extremely strong oxidizing power, has a very strong photooxidation function, can oxidize and decompose formaldehyde, and has a very strong purification function on the formaldehyde; the acrylic emulsion can also purify formaldehyde under the condition of no light source; the alkali-rich environment of the paint film can also excite the reducibility of the formaldehyde, so that the formaldehyde is easier to be oxidized; three different technical paths and mutual cooperation can ensure that the paint film has extremely high decomposition function on formaldehyde no matter whether under the condition of having a light source or not.

Class a fire protection: except a small amount of emulsion and a very small amount of organic auxiliary agent, other components in the paint are inorganic materials, the proportion of organic components is less than 5 wt%, the fire-proof grade reaches A level, and the formed paint film has good incombustibility and fire resistance and good fire-proof effect.

4. And (3) smell removal and environmental protection: because calcined shell powder is mainly used as a film forming substance, the addition amount of the emulsion is small, Volatile Organic Compounds (VOC) brought into the coating are few, the coating does not need to be added with a preservative, formaldehyde and other harmful components are not contained, and the environment-friendly performance of the coating is high.

5. The storage stability is high: the calcined shell powder is subjected to surface treatment to prepare slurry, so that the compatibility with other components is greatly increased, and particularly the direct impact on the emulsion is reduced; the pre-emulsification of the photocatalyst inhibits the self-aggregation of the photocatalyst, and reduces the thickening tendency of the system; functional monomers are introduced in the process of preparing the acrylic emulsion, and a designed synthesis process is combined, so that the formaldehyde resistance function is ensured, the alkali resistance is good, the acrylic emulsion has good compatibility with other components of a system, several important links influencing the stability are optimized, and the final coating has good storage stability.

Detailed Description

The modified calcined shell slurries used in the following examples or comparative examples were prepared by the following steps:

s1: preparing calcined shell powder: fully calcining the shell powder at the temperature of 1000-1200 ℃, cooling after the calcination is finished, and then carrying out ball milling by using a ball mill;

s2: aging of calcined shell powder: soaking the calcined shell powder obtained in the step S1 in deionized water, and fully curing;

s3: preparing an emulsion: adding deionized water and sodium dodecyl sulfate into a heating container according to a mass ratio of 99:1, heating to 60 ℃, fully stirring for 60min, and stopping the machine for standby when the system is in a uniform state;

s4: modified calcined shell powder slurry: adding deionized water and a titanate coupling agent into a stirring kettle, uniformly stirring, adding calcined shell powder aged in the step S2, fully dispersing, coating the surface of the calcined shell powder, adding the emulsion in the step S3, emulsifying the calcined shell powder coated by the coupling agent, fully dispersing, and filtering with a filter cloth of 160 meshes to obtain the modified calcined shell powder slurry.

The acrylic emulsions used in the following examples or comparative examples were prepared by the following steps:

s1, pre-emulsifying monomers, namely adding deionized water into a reaction kettle, then sequentially adding hard monomers, soft monomers, acetoacetoxy ethyl methacrylate and an emulsifier, heating to 75 ℃, and fully stirring to prepare pre-emulsifying monomers;

s2, synthesizing seed emulsion, namely adding deionized water and 1/4 pre-emulsified monomers into a reaction kettle, heating to 78 ℃, adding a 1/4 initiator, initiating polymerization and synthesizing seed emulsion;

s3, heating to 83 ℃, uniformly dripping 2/4 pre-emulsified monomers and 2/4 initiator into the reaction kettle within 3-3.5h, and fully polymerizing;

s4, heating to 85 ℃, dropwise adding the remaining 1/4 pre-emulsified monomers and 1/4 initiator into the reaction kettle within 1h, and preserving heat for 0.5h after dropwise adding;

s5, cooling to 65 ℃, and using tert-butyl hydroperoxide (TBHP) and NaHSO₃Reducing the content of residual monomers, after 0.5h, reducing the temperature to 40 ℃, adjusting the PH value to 7.5-8 by ammonia water, filtering and discharging.

The photocatalyst dispersion used in each of the following examples or comparative examples was prepared by the following steps:

adding a certain amount of deionized water into a reaction kettle, adding a nonionic surfactant, uniformly stirring, then adding a photocatalyst, dispersing at a high speed until the fineness is less than 60 um.

The solvent used in each of the following examples or comparative examples was deionized water.

Example 1

The antiviral and formaldehyde-resistant class A fireproof interior wall coating comprises the raw materials shown in the table 1.

TABLE 1

The preparation method of the antiviral formaldehyde-resistant A-grade fireproof interior wall coating comprises the following steps:

s1, adding the water and the cellulose in the table 1 into a stirring kettle, fully stirring and dispersing, then adding the dispersing agent and the antifreezing agent, and uniformly stirring;

s2, sequentially adding the modified calcined shell powder slurry, titanium dioxide, photocatalyst dispersion liquid and coarse whiting in the table 1 into a reaction kettle, and dispersing at high speed until the fineness is less than 60 um;

s3, sequentially adding the acrylic emulsion, the defoaming agent and the film-forming assistant in the table 1 into the reaction kettle, and uniformly stirring at a medium speed to obtain a finished product.

Example 2

The antiviral and formaldehyde-resistant class A fireproof interior wall coating comprises the raw materials shown in the table 2.

TABLE 2

s1, adding the water and the cellulose in the table 2 into a stirring kettle, fully stirring and dispersing, then adding the dispersing agent and the antifreezing agent, and uniformly stirring;

s2, sequentially adding the modified calcined shell powder slurry, titanium dioxide, photocatalyst dispersion liquid and coarse whiting in the table 2 into a reaction kettle, and dispersing at high speed until the fineness is less than 60 um;

s3, sequentially adding the acrylic emulsion, the defoaming agent and the film-forming assistant in the table 2 into the reaction kettle, and uniformly stirring at a medium speed to obtain a finished product.

Example 3

The antiviral and formaldehyde-resistant class A fireproof interior wall coating comprises the raw materials shown in the table 3.

TABLE 3

s1, adding the water and the cellulose in the table 3 into a stirring kettle, fully stirring and dispersing, then adding the dispersing agent and the antifreezing agent, and uniformly stirring;

s2, sequentially adding the modified calcined shell powder slurry, titanium dioxide, photocatalyst dispersion liquid and coarse whiting in the table 3 into a reaction kettle, and dispersing at a high speed until the fineness is less than 60 um;

s3, sequentially adding the acrylic emulsion, the defoaming agent and the film-forming assistant in the table 3 into the reaction kettle, and uniformly stirring at a medium speed to obtain a finished product.

Comparative example 1

Compared with the embodiment 1, the modified calcined shell powder slurry is lacked, and other raw materials are unchanged; and adding no modified calcined shell powder slurry in the preparation process to obtain the product.

Comparative example 2

Compared with the embodiment 1, the modified calcined shell powder slurry is lacked, the acrylic emulsion is changed into the common styrene-acrylic emulsion, and other raw materials are unchanged; the modified calcined shell powder slurry and the acrylic emulsion are not added in the preparation process, so that the product is obtained.

Comparative example 3

Compared with the example 1, the comparative example lacks acrylic emulsion and has the same raw materials; the product is obtained without adding acrylic emulsion in the preparation process.

Comparative example 4

Compared with the example 1, the comparative example lacks photocatalyst dispersion liquid, and other raw materials are unchanged; the photocatalyst dispersion liquid is not added in the preparation process to obtain the product.

Comparative example 5

Compared with the example 1, the comparative example lacks photocatalyst dispersion liquid and acrylic emulsion, and other raw materials are unchanged; the photocatalyst dispersion liquid and the acrylic emulsion are not added in the preparation process, and the product is obtained.

The antiviral performance and antiviral durability were tested according to T/CNCIA 01014-.

The antibacterial performance was tested according to HG-T3950-2007 antibacterial paint.

The formaldehyde purification performance and the formaldehyde purification durability were tested according to JCT 1074-2008 "indoor air purification function coating material purification performance".

The fire-retardant rating classification is carried out according to GB 8624-2012 'fire-retardant rating of building materials and products'.

The VOC of the product is tested according to GB 18582-.

The products obtained in examples 1 to 3 and comparative examples 1 to 5 were subjected to corresponding performance tests according to the above criteria, and the results are shown in Table 4.

TABLE 4

As is clear from Table 4, the products prepared in examples 1 to 3 are excellent in antiviral and antibacterial properties and also in durability, formaldehyde resistance and durability, and fire resistance, and have few volatile organic compounds; compared with the comparative example 1, the modified calcined shell powder slurry is lacked, the antiviral and antibacterial functions are basically absent, and the formaldehyde purification performance is slightly reduced; compared with the comparative example 2, the modified calcined shell powder slurry is lacked, the common acrylic emulsion is adopted, the antiviral and antibacterial functions are obviously reduced, the antiviral and antibacterial functions are basically not generated, and the formaldehyde purification performance is also reduced more; compared with the comparative example 3, the acrylic emulsion is lacked, the antiviral and antibacterial functions are not obviously reduced, and the formaldehyde purification performance is reduced to a certain extent; compared with the comparative example 4, the example 1 lacks of photocatalyst dispersion liquid, the antiviral and antibacterial properties are not obviously reduced, and the formaldehyde purification performance is obviously reduced; compared with the comparative example 5, the photocatalyst dispersion and the acrylic emulsion are absent in the example 1, the antiviral and antibacterial effects are not obviously reduced, and the formaldehyde purification performance is very weak.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An antiviral and formaldehyde-resistant A-grade fireproof interior wall coating is characterized by comprising the following components in parts by weight: comprises 20-30 parts of deionized water, 0.3-0.6 part of cellulose, 0.3-0.6 part of dispersing agent, 0.3-0.8 part of antifreezing agent, 30-45 parts of modified calcined shell powder slurry with the solid content of 65-75%, 5-10 parts of titanium dioxide, 10-15 parts of photocatalyst dispersion liquid, 5-17 parts of heavy calcium carbonate, 5-9 parts of acrylic emulsion, 0.1-0.5 part of defoaming agent and 0.3-0.8 part of film-forming auxiliary agent.

2. The antiviral and formaldehyde-resistant class A fireproof interior wall coating according to claim 1, wherein the modified calcined shell powder slurry is prepared by the following method:

and (3) carrying out surface coating treatment on the calcined shell powder by using a titanate coupling agent, and then carrying out emulsification treatment by using a surfactant for emulsifying the calcined shell powder.

3. The antiviral and formaldehyde-resistant class A fireproof interior wall coating according to claim 1 or 2, wherein the modified calcined shell powder slurry is prepared by the following method:

4. The antiviral and formaldehyde-resistant class A fireproof interior wall coating according to claim 1 or 2, wherein the acrylic emulsion is prepared by the following method:

5. The antiviral and formaldehyde-resistant class A fireproof interior wall coating according to claim 1 or 2, wherein the photocatalyst dispersion is prepared by the following method:

6. The antiviral formaldehyde-resistant class A fireproof interior wall coating according to claim 1, wherein the titanium dioxide is rutile titanium dioxide which is prepared by a chlorination method and is not subjected to surface coating; the surfactant for emulsifying the shell powder is sodium dodecyl sulfate or polyoxyethylene ether; the cellulose is hydroxyethyl cellulose and/or hydroxypropyl methyl cellulose; the dispersant is polyacrylic acid sodium salt dispersant.

7. The antiviral and formaldehyde-resistant class A fireproof interior wall coating according to claim 1, wherein the antifreeze agent is one selected from ethylene glycol, propylene glycol and surfactant type antifreeze agents.

8. The antiviral and formaldehyde-resistant class A fireproof interior wall coating according to claim 1, wherein the defoamer is selected from one or more of mineral oil, vegetable oil, polyether modified silicone and hydrocarbon.

9. The antiviral and formaldehyde-resistant class A fireproof interior wall coating according to claim 1, wherein the film forming aid is selected from alcohol ether and/or alcohol ester film forming aids.

10. A method for preparing an antiviral and formaldehyde-resistant class a fire-retardant interior wall coating according to any one of claims 1 to 9, comprising the steps of: