CN115124924A

CN115124924A - Antivirus emulsion paint composition without bactericide addition, preparation method and application

Info

Publication number: CN115124924A
Application number: CN202111543974.0A
Authority: CN
Inventors: 陈月志; 杨勇
Original assignee: Huantushi Coating Co ltd
Current assignee: Huantushi Coating Co ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-09-30

Abstract

The invention belongs to the technical field of coatings, and particularly discloses an antiviral latex paint composition without addition of a bactericide, and a preparation method and application thereof. The emulsion paint composition comprises the following components in parts by weight: 20-32 parts of a film forming substance; 22-38 parts of pigment and filler; 2-5 parts of a coating additive; and water; wherein the film forming substance is organic-inorganic hybrid acrylate copolymer emulsion; the filler contains 2-3 parts by weight of functional filler; the coating additive comprises a thickening agent, a pH regulator, a dispersing agent, a defoaming agent, a film-forming additive, a preservative, a mildew inhibitor or a combination thereof. The emulsion paint has long-acting antiviral and antibacterial effects, and can effectively kill influenza A virus H3N2, enterovirus 71 (hand-foot-and-mouth disease), human coronavirus HCoV-229E, staphylococcus aureus, escherichia coli and mould; has the characteristics of safety, durability, no color change, low odor, ultralow VOC, ultralow emission, excellent scrubbing resistance, excellent covering power and the like.

Description

Antivirus emulsion paint composition without bactericide addition, preparation method and application

Technical Field

The invention belongs to the technical field of coatings, relates to a latex paint composition, and particularly relates to an antiviral latex paint composition without addition of a bactericide, and a preparation method and application thereof.

Background

In recent years, epidemic diseases caused by viral and bacterial infections have greatly influenced people's life, learning, and economy. Especially, like the cross infection of common staphylococcus aureus, escherichia coli, candida and the like, seasonal influenza, hand-foot-and-mouth disease and the like caused by viruses have great influence on the life and study of students. Therefore, antiviral and antibacterial products, including coatings with antiviral and antibacterial functions, are hot spots for industrial research. At present, the antiviral paint mainly realizes the antiviral and antibacterial functions of the paint by adding an antibacterial agent and a preservative. The inorganic antibacterial agent used in the paint is mainly a carrier containing metal ions with antiviral and antibacterial properties, and carries metal ions such as silver, copper, zinc and the like, and particularly, the silver ion-carrying agent is widely used. The bactericide added into the conventional coating has high toxicity, easy dissolution and poor heat resistance and durability, and the bactericide-free antibacterial agent has advantages in safety, durability, broad-spectrum antibacterial property, heat resistance and the like, so that the application and research of the bactericide are more and more paid attention to by people.

The main technical route of the antiviral and antibacterial coating using silver ions or copper ions in the market at present is to physically mix and add an antibacterial agent containing a metal ion carrier in a coating formula in the coating preparation process, wherein the silver-carrying antibacterial agent is the most common antibacterial agent, so that the antiviral and antibacterial functions are realized. This method has the following limitations for formulating coatings:

1. long-lasting antiviral, antibacterial effect: the latex paint has reduced antiviral and antibacterial efficiency during storage.

In the latex containing the silver-carrying antibacterial agent, the release of silver ions realizes the antiviral and antibacterial properties. The release speed is higher and is slowed down along with the time, and the continuous release of the silver ions ensures the long-acting antiviral and antibacterial effects. Silver ion can destroy the activity of cell membrane or cell plasma active enzyme of bacteria and virus at very low concentration, and has very strong bactericidal and sterilizing effects. The latex paint can realize the antiviral and antibacterial efficiency of more than 99 percent by adding a small amount of silver-carrying antibacterial agent.

In the storage process of the emulsion paint, silver ions continuously released are converted into simple substance silver and oxidized into dark brown silver oxide, so that the antiviral and antibacterial effects are reduced. And the emulsion paint is discolored along with the continuous generation and accumulation of the silver oxide.

2. The long-acting performance of the antiviral and antibacterial effects of the paint film is as follows: the long-term efficacy is affected due to dissolution consumption of the antibacterial agent;

silver ions are sensitive to heat and light and are easily reduced into silver simple substances to reduce the antiviral and antibacterial properties, which is the defect of the silver antibacterial agent. Along with the continuous release and conversion of silver ions, the silver ions on the surface are continuously lost, so that the antibacterial agent can not release enough silver ions to completely kill bacteria and viruses, and the antiviral and antibacterial efficiency is reduced.

3. The utilization efficiency of the antibacterial agent is low, the inorganic antibacterial agent is attenuated continuously in the storage and use processes of the latex paint, and the antibacterial agent has to be added excessively in consideration of long-term effects;

4. the 'side effect' brought by the antibacterial agent causes the discoloration problem of the latex paint and the paint film. Silver ions in the latex paint and the paint film after coating are reduced into simple substance silver and finally converted into dark brown silver oxide in the storage process of the latex paint, and the color of the latex paint and the paint film is changed along with the continuous accumulation of the silver oxide;

5. the side effect brought by the antibacterial agent, undefined safety, namely injury possibly caused by contact with a human body after the antibacterial agent is dissolved out;

in conclusion, the latex paint composition which has no bactericide addition and has long-acting antiviral and antibacterial functions is lacked in the field so as to meet the market demand.

Therefore, the development of an antiviral latex paint composition which is free of bactericide addition, free of color change, safe, long-acting and low in odor is urgently needed in the field, has a long-acting inhibiting and killing function on various viruses and bacteria, has the characteristics of safety, long-acting and low VOC ultralow release on the premise of remarkable antiviral and antibacterial effects of latex paint, still has good conventional performance of paint, maintains excellent washing resistance and covering power, and meets various requirements of consumers.

Disclosure of Invention

The invention aims to disclose an antiviral latex paint composition without bactericide addition and a preparation method thereof, wherein the antiviral latex paint composition has a long-acting inhibiting and killing function on various bacteria and viruses, has the characteristics of safety, long acting and low VOC ultralow release on the premise of obvious antiviral and antibacterial effects of latex paint, still has good conventional performance of paint, and keeps excellent washing resistance and covering power.

In a first aspect, the present invention provides an antiviral latex paint composition without the addition of a biocide, said composition comprising:

the film-forming substance is organic-inorganic hybrid acrylate copolymer emulsion, and the polymer emulsion is formed by grafting an inorganic silicate compound on an acrylate polymer through chemical bonding. Compared with the conventional polymer, the coating prepared by adopting the inorganic silicon hybrid polymer emulsion has more micropore structures and is rich in alkalinity; has better antiviral and antibacterial effects!

The silicate may be an alkali metal silicate, or a monovalent alkali metal silicate bearing an alkyl group.

The pigment and the filler are selected from: titanium dioxide, kaolin, calcium carbonate powder, talcum powder or a combination thereof;

the functional filler is porous diatomite calcined at controlled temperature;

the paint auxiliary agent comprises a thickening agent, a pH regulator, a dispersing agent, a defoaming agent, a film-forming auxiliary agent, a preservative, a mildew preventive and the like.

The emulsion particle size distribution of the film forming material is 100-200nm, the glass transition temperature Tg is 15-25 ℃, and the minimum film forming temperature MFFT is 10-22 ℃. And subjected to physical odor removal treatment.

The antivirus emulsion paint composition without the bactericide is free of bactericide in the preparation process, after film forming, no metal ions are separated out, the composition is environment-friendly and non-sensitive, and an environment type immune antibody can be constructed.

The antiviral process of the antiviral emulsion paint composition without the bactericide addition after film formation can be simply understood as follows: the density (number) of the pores of the paint film is more than ten times of that of the conventional high PVC paint (see figure 1), the pore diameter of the paint film is larger than the particle diameter of viruses, the viruses can easily enter the pores, the pores are rich in alkalinity, the viruses and bacteria can be easily killed, the viruses and the bacteria are easy to kill, like pitcher plant catches insects, and the killing process is defined as 'trapping and killing of caging'.

Further, the coating auxiliary agent has one or more of the following characteristics:

the thickening agent is selected from: inorganic clays, cellulosic thickeners, HASE thickeners, HEUR thickeners, or combinations thereof;

the pH regulator is an inorganic base neutralizer.

The dispersant is polyacrylate dispersant;

the defoaming agent is selected from: silicone based defoamers, mineral oil based defoamers, or combinations thereof;

the film-forming aid is selected from: organic ester film-forming assistant with boiling point higher than 287 ℃ under standard atmospheric pressure;

the coating auxiliary agent comprises the following components in percentage by weight:

thickening agent: pH regulator: dispersing agent: defoaming agent: film-forming auxiliary agent: preservative: the weight ratio of the mildew preventive is as follows:

(0.5～2.0)：(0.05～0.25)：(0.3～0.7)：(0.3～0.8)：(0.8～1.8)：(0.1～0.5)：(0～0.5)。

the antiviral latex paint composition without the bactericide addition further preferably comprises:

the film forming substance is organic-inorganic hybrid acrylate copolymer emulsion;

the pigment and filler is titanium dioxide, kaolin and calcium carbonate powder, and the weight ratio of the titanium dioxide, the kaolin and the calcium carbonate powder is as follows: (20 to 25), (4 to 8), (0 to 7.5);

the functional filler is Celite 499;

the dispersant is sodium polyacrylate dispersant Dispex AA 4140;

the defoaming agent is Foamstar ST2410 star polymer and Foamaster MO NXZ mineral oil in a weight ratio of 1:1 or 1: 2;

the thickening agent is cellulose thickening agent Natrosol 250HBR and inorganic rheological agent Attagel 40; polyether thickener Rheovis PE1331, polyacrylic thickener Rheovis HS 1212; the weight ratio is (2.5-4.0): 3.0: (4.0-8.0): (0.0 to 2.0);

the pH regulator is KOH solution (the concentration can be 10%);

the film-forming assistant is a high-boiling organic ester solvent LoxanolCA 5290;

preservatives, fungicides and water;

the thickening agent is: pH regulator: dispersing agent: defoaming agent: film-forming auxiliary agent: preservative: the weight ratio of the mildew preventive is as follows:

(0.5～2.0)：(0.05～0.20)：(0.3～0.7)：(0.3～0.8)：(0.8～1.8)：(0.1～0.5)：(0～0.5)。

in a second aspect, the present invention provides a latex paint for interior walls, said latex paint being prepared from the composition according to the first aspect of the invention.

In a third aspect, the present invention provides a method for preparing the latex paint according to the second aspect, wherein the method comprises the following steps: 20-32 parts by weight of a film forming material; 22-38 parts of pigment and filler; 2-3 parts of functional filler; 2-5 parts of a coating additive; diluting and mixing with water to obtain the latex paint.

In a fourth aspect, the present invention provides a use of the composition according to the first aspect or the latex paint according to the second aspect, which is used for coating in places with high environmental requirements (such as schools and hospitals), and can kill viruses and bacteria attached to wall surfaces efficiently for a long time, so as to reduce the risk of infection and transmission.

The antiviral emulsion paint composition without the bactericide is an emulsion paint with safe, long-acting and low-VOC ultralow-release functions, has excellent washing resistance and covering power, and can effectively kill harmful viruses and bacteria remained on the surface after the emulsion paint is coated. The antivirus and antibacterial performances meet the standard of T/CNCIA01014-2020 antibacterial and antivirus paint.

Detailed description of the invention:

the antiviral emulsion paint composition without the bactericide is mainly composed of the following components in parts by weight:

20-32 parts of a film forming material;

22-38 parts of pigment and filler;

2-3 parts of functional filler;

2-5 parts of a coating additive;

and water for the dispersion medium.

Film-forming material:

the film forming matter is organic-inorganic hybrid acrylate copolymer emulsion.

In one embodiment of the invention, the film-forming material has an emulsion glass transition temperature Tg of between 15 ℃ and 25 ℃.

In the invention, specifically, the solid content of the film-forming substance is about 48%, the VOC content is less than or equal to 200ppm, and the glass transition temperature Tg is 18-22 ℃.

Most preferably, the aqueous polymer emulsion is a microporous, alkali-rich polymer formed by mixing and hybridizing organic and inorganic substances, and is easy to kill viruses and bacteria. The water-based polymer emulsion has no hiding power, can not be directly used as a coating material, and provides antiviral and antibacterial functions and functions of bonding pigments and fillers in the composition.

Pigment and filler: in one embodiment of the present invention, the pigment and filler is selected from titanium dioxide, kaolin, ultrafine calcium carbonate powder, talc or a combination thereof.

Preferably, the pigment filler is selected from titanium dioxide, kaolin and calcium carbonate powder, and is mixed according to the proportion of (20-25): 4-8): 0-7.5 to prepare the emulsion paint, so as to provide the covering power, the gloss and other requirements of the coating material, and meet the functions of product decoration and building wall protection.

Functional filler

In one embodiment of the present invention, the functional filler is temperature-controlled calcined porous diatomaceous earth;

specifically, a commercial product from IMERYS corporation under the name Celite 499; the composition plays a role in regulating gloss and improving covering in the coating material, mainly due to the principle of light weight, fluffy particles and porous structure. In addition, it also increases the surface contact area for killing virus and bacteria and enhances the antiviral and antibacterial effects.

Coating auxiliary agent

In one embodiment of the present invention, the coating adjuvant is selected from a dispersant, a defoamer, a thickener, a pH adjuster, a film forming adjuvant, a mildewcide, a preservative, or combinations thereof.

In one embodiment of the present invention, the dispersant is a sodium polyacrylate dispersant. Specifically, BASF, marketed dispex aa 4140.

Because latex paints themselves have a tendency to foam, which is problematic to manufacture and apply, defoaming agents are needed to suppress foam. In one embodiment of the present invention, the defoamer is a star polymer based defoamer, a mineral oil based defoamer or a combination thereof. More specifically, the defoaming agent is prepared by matching BASF commercial foamstar ST2410 polymer defoaming agent and Foamaster MO NXZ mineral oil defoaming agent to ensure the functions of providing quick and long-term defoaming and eliminating micro bubbles, and the preferred ratio of the two types of defoaming agents is 1:1 or 1: 2.

the paint thickener has many varieties, and mainly comprises four types, namely cellulose, polyacrylic acid thickener, nonionic associative thickener and inorganic thickener.

In one embodiment of the present invention, the thickener is a combination of a cellulose thickener, an inorganic rheological aid, a polyether thickener, and a polyacrylic thickener. Specifically, for example, as the cellulose-based thickener, a commercially available product of Ashland, trade name Natrosol 250 HBR; the inorganic rheology agent is commercially available from BASF under the trade name Attagel 40; the polyether thickener used is a commercially available product from BASF under the tradename Rheovis PE 1331; polyacrylic acid thickener is commercially available from BASF under the tradename Rheovis HS 1212.

The pH regulator of the invention adopts an inorganic alkali neutralizing agent, in particular KOH solution, so as to avoid causing odor.

The film-forming assistant adopts a high-boiling organic ester solvent, specifically a product sold in BASF under the trade name of LoxanolCA5290, so as to avoid causing odor and release amount.

The preservative of the present invention is not particularly limited as long as it does not limit the object of the present invention. Specifically, a commercially available product of Thor is used under the trade name of Acticide MBS.

The mildewcide of the present invention is not particularly limited as long as it does not limit the object of the present invention. Specifically, a commercially available product of Thor is used under the trade name of activide EPW.

Preferably, the thickening agent: pH regulator: dispersing agent: defoaming agent: film-forming auxiliary agent: preservative: the weight proportion of the mildew preventive is as follows:

(1.0～2.0):(0.1～0.2):(0.4～0.6):(0.4～0.8):(1.0～1.5):(0.3～0.5):(0.2～0.5)

more preferably, the coating auxiliary agent has the following weight ratio:

thickening agent: pH regulator: dispersing agent: defoaming agent: film-forming auxiliary agent: preservative: the weight proportion of the mildew preventive is as follows:

(1.3～1.8):(0.1～0.15):(0.5～0.6):(0.5～0.6):(1.2～1.5):(0.3～0.5):(0.3～0.5)。

the latex paint composition also contains an amount of water as a dispersing medium sufficient to allow for proper production, dilution of the low latex paint composition during construction. It is usually diluted to make the viscosity of the latex paint meet the required requirements. For example, 95-105KU is tested according to GB/T9756-2018 national standard of synthetic resin emulsion interior wall coating. Generally, the desired dispersing medium includes, but is not limited to, between 25 and 35 parts by weight water.

The components of the antiviral latex paint composition without the bactericide are synergistic, for example, the functional filler can increase the contact surface for killing viruses and bacteria, and keep a certain humidity so as to enhance the antiviral and antibacterial functions, and the like, and the details are not repeated herein.

The invention has the beneficial technical effects that:

the inventor of the invention has made extensive and intensive research, and through optimizing raw materials and improving a formula, the antivirus latex paint composition without the addition of a bactericide is prepared, has a long-acting inhibiting and killing function on various bacteria and viruses, has the characteristics of safety, long acting, low VOC ultralow release on the premise of remarkable antivirus and antibacterial effects of the latex paint, still has good conventional performance of the paint, maintains excellent washing resistance and covering power, provides a safe and colorless antivirus and antibacterial latex paint composition for consumers, and completes the invention on the basis.

It is to be understood that within the scope of the present invention, the above-described features of the present invention and those specifically described below (e.g., in the examples) may be combined with each other to form new or preferred embodiments. Not to be reiterated herein, but to the extent of space.

Drawings

FIG. 1 is a graph of the micropores formed by the present technology (a) compared with the micropore amount of a conventional high PVC interior wall paint (b) at a paint film magnification of 500 times (example 1).

Detailed Description

For a better understanding of the present invention, the following examples are provided to illustrate specific embodiments of the present invention and to enable those skilled in the art to understand the invention. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified; or prepared according to conventional methods in the art. Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer. Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

The technical concept of the invention is as follows:

in order to solve the problems of environmental hazard, human body contact injury, influence on long-term effect and emulsion paint color change caused by dissolution consumption of the antibacterial agent, a formula method of physically adding the antibacterial agent is abandoned, and the antiviral polymer emulsion without the addition of the antibacterial agent is selected. The polymer is prepared by a special inorganic matter and organic matter hybridization technology, so that emulsion film-forming substances are microporous and alkaline, and viruses and bacteria are easy to kill. Fundamentally solves various negative problems caused by adding bactericides outside the traditional antiviral paint.

As used herein, the appropriate amount of "dilution water" means that the water is present in an amount sufficient to dilute the latex paint composition. It is usually diluted to make the viscosity of the latex paint meet the required requirements. For example 95-105KU, according to the national standard for interior wall coatings GB/T9756-2018. Typically, the desired dilution amount includes, but is not limited to, between 25-35%.

Herein, the "polymer emulsion" refers to a polymer emulsion obtained by mixing and hybridizing an organic substance and an inorganic substance, wherein the polymer emulsion is formed by grafting an inorganic silicate compound on an acrylate polymer through chemical bonding. Compared with the conventional polymer, the coating prepared by adopting the inorganic silicon hybrid polymer emulsion has more micropore structures and is rich in alkalinity; has better sterilization effect! And the emulsion is subjected to a physical stripping treatment to remove residual monomers and odor.

The preparation of the organic-inorganic hybrid acrylate copolymer emulsion is characterized in that about 20 percent of silicate compound is introduced to participate in the reaction at the later stage of polymerization reaction, and the silicate compound and the polymer react and graft on organic macromolecules through a special bonding effect to generate the organic-inorganic hybrid polymer emulsion. The silicate may be an alkali metal silicate, or a monovalent alkali metal silicate bearing an alkyl group.

The invention provides an antiviral emulsion paint composition without bactericide, which selects polymer emulsion with antiviral and antibacterial functions, hereinafter referred to as emulsion for short, and can effectively kill viruses and bacteria for a long time. The composition mainly comprises the following components in parts by weight: 20-32 parts of a film forming substance; 22-38 parts of pigment and filler; 2-3 parts of functional filler; 2-5 parts of a coating additive; and water for the dispersion medium. Wherein, the film forming substance (i.e. antivirus emulsion or organic-inorganic hybrid acrylate copolymer emulsion) is introduced with about 20 percent of silicate compound to participate in the reaction at the later stage of the polymerization reaction, and the silicate compound and the polymer react and graft on organic macromolecules through special bonding action to generate organic-inorganic hybrid polymer emulsion. The silicate may be an alkali metal silicate, or a monovalent alkali metal silicate bearing an alkyl group. The particle size distribution of the obtained polymer emulsion is 100-200nm, the glass transition temperature Tg is 15-25 ℃, and the minimum film-forming temperature MFFT is 10-22 ℃. The solid content of the film forming material is about 48 percent, and the VOC content is less than or equal to 200 ppm.

The preparation method of the latex paint composition comprises the following steps:

a) putting water into a dispersion tank of a high-speed stirrer, and controlling the rotating speed at 800 revolutions per minute;

b) then adding a coating additive (0.2-0.3 parts by weight of cellulose; and 0.1 to 0.15 parts by weight of a pH adjusting agent) for 3 minutes;

c) adding the paint auxiliary agents (wetting dispersant and partial defoaming agent) into a dispersion tank slowly in sequence in a dispersion state;

d) respectively adding the inorganic rheological additive, the pigment, the filler and the functional filler into a dispersion tank, gradually increasing the rotating speed to 1800 rpm, and dispersing for 20-25 minutes, wherein the pulp temperature is not more than 55 ℃;

e) after the dispersion, the rotating speed is reduced to 600 plus 800 revolutions per minute, and the film forming additive is added and stirred for 5 minutes;

f) then adding the polymer emulsion, stirring for 5 minutes, sequentially adding the coating additives (rheological additive, preservative and mildew inhibitor), and stirring for 5 minutes;

g) then adding the rest of the defoaming agent to eliminate bubbles generated in the post-addition process;

h) finally adding water to adjust the viscosity to (95-105) KU, and preparing the finished product.

The weight composition of the components is as follows: 20-32 parts of a film forming material; 22-38 parts of pigment and filler; 2-3 parts of functional filler; 2-5 parts of a coating additive; and water for the dispersion medium.

The following table details the names, specific functions and preferred weight percentages of the raw materials of each component in the antiviral latex paint composition without biocide addition.

TABLE 1

The formulations of the examples are shown in table 2:

preparing raw materials according to the parts by weight in the table 2, and preparing the latex paint by adopting the following steps:

firstly, putting water into a dispersion tank, and controlling the rotating speed at 800 revolutions per minute; then adding the thickening agent 1 and the pH regulator and stirring for 5 minutes; sequentially and slowly adding the wetting dispersant and a part of the defoaming agent into a dispersion tank in a dispersion state; adding pigment, filler, functional filler and thickener 2 into a dispersion tank, gradually increasing the rotating speed to 1800 rpm, dispersing for 15-20 minutes, and keeping the pulp temperature not to exceed 55 ℃; after the dispersion, the rotating speed is reduced to 600-800 r/min, and the film-forming additive and the film-forming emulsion are sequentially added and stirred for 5 min; then sequentially adding the mildew preventive, the preservative and the thickening agent 3, and stirring for 3 minutes; then adding a defoaming agent; finally, adding water to adjust the viscosity to (95-105) KU, thus obtaining the finished product of the latex paint.

The material properties were tested according to the following criteria:

the product of the invention is subjected to performance tests such as water resistance, alkali resistance, adhesive force, stain resistance, washing resistance and the like, wherein the main performance test refers to GB/T9756-2018 national standards for interior wall coatings, the yellowing resistance is carried out according to the specification of GB/T23999-2009 6.4.21, and the antiviral and antibacterial functions are carried out according to the standard of T/CNCIA01014-2020 antibacterial and antiviral coatings.

Specific test results for examples 1, 2, 3 are given below in tables 3-6.

The latex paints prepared in the examples meet the technical requirements in aspects of container state, application property, alkali resistance, thick film cracking resistance, odor and the like.

TABLE 3

The antiviral and antibacterial performance effects of the antiviral emulsion paint composition without the addition of the bactericide according to the T/CNCIA01014-2020 antibacterial and antiviral paint are tested, and the results are shown in tables 4, 5 and 6.

TABLE 4

TABLE 5

TABLE 6

From the above examples 1, 2 and 3 and the antiviral and antibacterial effects thereof, the requirements of the standard of T/CNCIA01014-2020 antibacterial and antiviral paint can be completely met, and in the comparative example, the key substance of the invention is the use of the film forming substance, namely the antiviral emulsion, and the weight part of the film forming substance is 20-32, if the film forming substance is added in an amount of less than 20% by weight, such as 16%, the stain resistance of the finished paint is reduced, the children paint standard cannot be met, the physical properties are also reduced, and even the durability of the antiviral and antibacterial properties is greatly reduced if the content of the film forming substance is further reduced. On the contrary, if the coating is prepared by adding more than 32 weight percent, for example, 35 percent, the finished paint film is more compact and more resistant to washing, but the number of micropores of the paint film is reduced, the antiviral and antibacterial properties are affected, the more the content of the film-forming substance is added, the higher the cost is, and the antiviral property is gradually weakened; and then, a film forming substance is added, the compactness of a paint film is better after drying, but the negative influence is that the quality of matched primer and putty is good, otherwise, poor putty can be brought, and the phenomenon of bottom biting occurs, so that the ratio of the parts by weight of the film forming substance is 20-32 in conclusion.

FIG. 1 is a graph of the micropores formed by the present technology, compared with the amount of micropores in a conventional high PVC interior wall paint at a 500-fold magnification of the paint film. And testing the density and size of pores in the dried paint film by a mercury intrusion method. The test principle is to sufficiently penetrate mercury into a dried coating film under pressure and then determine the size and density of pores by testing the particle size and number thereof. The distribution of the pores indicates that: 1. the pore diameter of the pores is distributed around 1um (the virus is 100-200nm), and the density (number) of the pores is 2, which is tens of times of that of the conventional high PVC coating.

Claims

1. An antiviral latex paint composition without the addition of a biocide, said composition comprising:

the film-forming substance is organic-inorganic hybrid acrylate copolymer emulsion, and the polymer emulsion is formed by grafting an inorganic silicate compound on an acrylate polymer through chemical bonding;

the functional filler is porous diatomite calcined at a controlled temperature;

the coating auxiliary agent comprises a thickening agent, a pH regulator, a dispersing agent, a defoaming agent, a film-forming auxiliary agent, a preservative and a mildew preventive.

2. The antiviral latex paint composition without the addition of a bactericide according to claim 1, wherein the emulsion of the film-forming material is microporous and alkaline, and is susceptible to killing viruses and bacteria; the polymer emulsion has the particle size distribution of 100-200nm, the glass transition temperature Tg of 15-25 ℃, and the minimum film-forming temperature MFFT of 10-22 ℃.

3. The antiviral latex paint composition without the addition of bactericide according to claim 1,

the pH regulator is an inorganic base neutralizer;

the dispersant is polyacrylate dispersant;

the film-forming aid is selected from: organic ester film-forming assistant with boiling point higher than 287 deg.c at normal atmosphere.

4. The antiviral latex paint composition without the addition of a bactericide according to claim 1, wherein the weight ratio of the thickener: pH regulator: wetting and dispersing agent: defoaming agent: film-forming auxiliary agent: preservative: the weight ratio of the mildew preventive is as follows: (0.5 to 2.0), (0.05 to 0.20), (0.3 to 0.7), (0.3 to 0.8), (0.8 to 1.8), (0.1 to 0.5), (0 to 0.5).

5. The antiviral latex paint composition without the addition of a bactericide according to claim 1, wherein the weight ratio of the thickener: pH regulator: dispersing agent: defoaming agent: film-forming auxiliary agent: preservative: the weight ratio of the mildew preventive is as follows: (1.0 to 1.5), (0.1 to 0.2), (0.4 to 0.6), (0.4 to 0.8), (1.0 to 1.5), (0.3 to 0.5), (0.2 to 0.5).

6. The antiviral latex paint composition without the addition of germicides according to claim 1, wherein said composition comprises:

the film forming material is organic-inorganic hybrid acrylate copolymer emulsion, and the weight ratio is 20-32;

the functional filler is Celite499, and the weight ratio is 2-3;

the dispersant is sodium polyacrylate dispersant DispexAA 4140;

the thickening agent is a cellulose thickening agent Natrosol 250HBR and an inorganic rheological agent Attagel 40; polyether thickener Rheovis PE1331 and polyacrylic thickener Rheovis HS1212, wherein the weight ratio is (2.5-4.0): 3.0: (4.0-8.0): (0.0 to 2.0);

the pH regulator is KOH solution;

preservatives, fungicides and water;

the thickening agent is: pH regulator: dispersing agent: defoaming agent: film-forming auxiliary agent: preservative: the weight proportion of the mildew preventive is as follows: (0.5-2.0): (0.05-0.20): (0.3-0.7): (0.3-0.8): (0.8-1.8): (0.1-0.5): (0 to 0.5).

7. A latex paint for interior walls made from the antimicrobial latex paint composition of claim 1.

8. A method for preparing the latex paint of claim 7, comprising the steps of: 20-32 parts by weight of a film forming material; 22-38 parts of pigment and filler; 2-3 parts of functional filler; 2-5 parts of a coating additive; diluting and mixing with water to obtain the latex paint.

9. Use of the composition according to any one of claims 1 to 6 for coating high environmental demand places to kill bacteria and viruses attached to walls, thereby reducing the risk of infection and transmission.