CN115491124A

CN115491124A - Low-odor long-acting antibacterial interior wall latex paint composition, and preparation method and application thereof

Info

Publication number: CN115491124A
Application number: CN202110673380.5A
Authority: CN
Inventors: 窦万强; 林凡秋; 周夏辉
Original assignee: Dbc Group Co ltd; Dbc New Material Technology Shanghai Co ltd; Huantushi Coating Co ltd
Current assignee: Dbc Group Co ltd; Dbc New Material Technology Shanghai Co ltd; Huantushi Coating Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-12-20

Abstract

The invention belongs to the technical field of coatings, and particularly discloses a non-discoloring low-odor long-acting antibacterial interior wall latex paint composition and a preparation method thereof. The emulsion paint composition mainly comprises the following components in parts by weight: 28-38 parts of a film forming substance; 25-40 parts of pigment and filler; 2-5 parts of a coating additive; and water for dilution; wherein, the film forming substance is polymer emulsion with active nano silver ion antibacterial material coupled on the polymer chain; the filler contains 2-3 parts by weight of functional filler, and the functional filler is porous diatomite calcined by temperature control. 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 latex paint prepared by the invention has long-acting antibacterial effect and can effectively kill staphylococcus aureus and escherichia coli. Meanwhile, the paint has the characteristics of safety, no color change, low odor, ultralow VOC and ultralow emission.

Description

Low-odor long-acting antibacterial interior wall latex paint composition, and preparation method and application thereof

Technical Field

The invention belongs to the technical field of coatings, relates to a latex paint composition, and particularly relates to a low-odor long-acting antibacterial interior wall latex paint composition as well as a preparation method and application thereof.

Background

For a long time, epidemic diseases caused by bacterial infection have great influence on life, learning and economy of people. Especially, the cross infection of common staphylococcus aureus, escherichia coli, candida and the like brings great influence on the learning and the life of students. Therefore, antibacterial products, including coatings with antibacterial function, are hot spots for industrial research. The conventional paint mildew-resistant bactericide has high toxicity, easy dissolution and poor heat resistance and durability, while the inorganic antibacterial agent has advantages in the aspects of safety, durability, broad-spectrum antibacterial property, heat resistance and the like, so that the application and research of the conventional paint mildew-resistant bactericide are more and more paid attention to by people. At present, inorganic antibacterial agents used in the paint are mainly carriers containing antibacterial metal ions, and metal ions such as silver, copper, zinc and the like are carried, and especially silver-carrying antibacterial agents are most widely used.

At present, the antibacterial coating using silver ions or copper ions on the market is prepared by physically mixing and adding 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 to realize the antibacterial function. This method of formulating coatings has the following limitations:

1. long-lasting antibacterial effect: reduction of antimicrobial efficiency of latex paints during storage.

In latexes containing silver-loaded antimicrobials, the release of silver ions achieves antimicrobial performance. 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 antibacterial effect. Silver ions can destroy the activity of cell membranes or cell plasma active enzymes of bacteria at very low concentration, and the bactericidal effect is very strong. The emulsion paint can realize the 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 antibacterial effect is reduced. And the emulsion paint is discolored along with the continuous generation and accumulation of the silver oxide.

2. Long-acting performance of the antibacterial effect of the paint film: the long-term durability 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 antibacterial performance, which is the defect of the silver antibacterial agent. 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 the 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 emulsion paint, and the antibacterial agent has to be added in excess to cause the reduction of the utilization efficiency 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 are reduced into simple substance silver and finally converted into dark brown silver oxide in the storage process and the paint film after coating, 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 view of the foregoing, there is a lack in the art of a latex paint composition that is non-discoloring, low odor, has long-lasting antimicrobial properties to meet market pace.

Therefore, the development of a non-discoloring, safe, low-odor and long-acting antibacterial latex paint composition which has a long-acting inhibiting and killing function on various pathogenic bacteria, has the characteristics of safety and low VOC ultralow release on the premise of an obvious antibacterial effect of the latex paint, still has good conventional performance of the paint, maintains excellent water resistance, alkali resistance and scrubbing resistance, and meets various requirements of consumers is urgently needed in the field.

Disclosure of Invention

The invention aims to disclose a low-odor long-acting antibacterial interior wall latex paint composition and a preparation method thereof, wherein the low-odor long-acting antibacterial interior wall latex paint composition has a long-acting inhibiting and killing function on various pathogenic bacteria, has the characteristics of safety and ultralow VOC (volatile organic compound) ultralow release on the premise of obvious antibacterial effect of latex paint, still has good conventional performance of paint, and keeps excellent water resistance, alkali resistance and stain resistance.

In a first aspect, the present invention provides an ultra-low odor, long-lasting antimicrobial latex paint composition comprising:

28-38 parts of a film forming substance;

25-40 parts of pigment and filler;

the filler contains 2 to 3 weight parts of functional filler;

2-5 parts of a coating additive;

proper amount of water is used for the dispersion medium;

the film forming material is coupled with the water-based acrylate polymer emulsion of the active nano silver antibacterial agent;

an aqueous acrylate polymer emulsion coupled with an active nano-silver antimicrobial; the main monomer used by the polymer emulsion is at least 2 monomers selected from methyl methacrylate, styrene, butyl acrylate and isooctyl acrylate, and at least one polymerizable siloxane containing unsaturated bonds is used for obtaining a polymer emulsion through emulsion polymerization; then the emulsion is hydrolyzed in the presence of water and a silicon dioxide carrier containing active nano silver to realize coupling.

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 a 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.

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 inorganic alkali neutralizer.

The dispersant is polyacrylate dispersant;

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

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

the emulsion of the film-forming material is a carrier chemically coupled to an active silver-containing antimicrobial agent on an acrylate polymer chain. The free migration of the carrier is limited by the chemical coupling realized by the reaction of the functional monomer on the polymer chain and the carrier, and the controlled slow release of silver ions is realized by the binding effect of the carrier. The particle size distribution is 100-200 nm, 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.

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

Most preferably, the aqueous polymer emulsion is chemically coupled to its polymer chain with a silver ion antimicrobial agent. The aqueous polymer emulsion does not have any hiding power per se, cannot be directly used as a coating material, and provides an antibacterial function and a function of bonding pigments and fillers in the composition.

Most preferably, the emulsion of the film-forming material is PLUS7045.

The ultralow-odor long-acting antibacterial latex paint composition further preferably comprises:

the film forming material is an antibacterial emulsion adopting a chemical coupling silver ion antibacterial agent;

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

the functional filler is Celite499;

the dispersant is sodium polyacrylate dispersant Dispex AA4140;

the defoaming agent is Foamstar ST2410 star polymer and Foamaster MO NXZ mineral oil, and the weight ratio is 1;

the thickening agent is cellulose thickening agent Natrosol 250HBR and inorganic rheological agent Attagel40; polyether thickener Rheovis PE1331, polyacrylic thickener Rheovis HS1212; 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 LoxanolCA5290;

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 a 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: 28-38 parts of a film forming material; 25-40 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 of the first aspect or the latex paint of the second aspect of the present invention for coating in high environmental requirements (such as schools and hospitals), and efficiently killing germs attached to wall surfaces for a long time to reduce infection and transmission risks.

The low-odor long-acting antibacterial emulsion paint composition is an emulsion paint with safe, non-discoloring, ultralow VOC (volatile organic compounds), ultralow release and long-acting antibacterial functions. Namely, after the latex paint is coated, the harmful bacteria remained on the surface of the coating can be effectively killed, and the antibacterial property reaches the requirement of the antibacterial property I of HG/T3950-2007.

In the invention:

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 and filler is selected from titanium dioxide, kaolin and calcium carbonate powder, and is mixed according to the proportion of (20-25) to (4-8) to (0-7.5) to prepare the emulsion paint, so as to provide the requirements of covering power, gloss and the like required by 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 under the trade name Celite499; 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 contact area of the sterilization surface and enhances the antibacterial effect.

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 a combination thereof.

In one embodiment of the present invention, the dispersant is a sodium polyacrylate dispersant. Specifically, BASF marketed Dispex AA4140.

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 defoamer is prepared by matching and using a BASF product Foamastar ST2410 star polymer defoamer and a Foamaster MO NXZ mineral oil defoamer to ensure the functions of providing quick and long-term defoaming and eliminating micro bubbles, and the preferred matching ratio of the two defoamers is 1 or 1:2.

the paint thickener has various types, 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 250HBR; the inorganic rheology agent is commercially available from BASF under the trade name Attagel40; the polyether thickener used is a commercially available product from BASF under the tradename Rheovis PE1331; polyacrylic acid thickener is commercially available from BASF under the tradename Rheovis HS1212.

The pH regulator provided by the invention adopts an inorganic alkali neutralizing agent, specifically a 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 Loxanol CA5290, 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:

(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 KU to 105KU is tested according to national standard GB/T9756-2018 synthetic resin emulsion interior wall paint. Generally, the desired dispersion medium is between 25 and 35 parts by weight with water, including but not limited to.

The components of the low-odor long-acting antibacterial emulsion paint composition have a synergistic effect, for example, the functional filler can increase the sterilization contact surface and keep a certain humidity so as to enhance the silver ion release sterilization function, and the like, and the details are not repeated here.

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 repeated herein, depending on the space.

Drawings

FIG. 1 is a diagram showing that the coupling technique of the present invention does not produce a zone of inhibition due to dissolution.

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 otherwise defined or stated, 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 inventor of the invention carries out extensive and intensive research, and prepares a low-odor long-acting antibacterial emulsion paint composition by optimizing raw materials and improving a formula, and the low-odor long-acting antibacterial emulsion paint composition has long-acting and consistent killing effect on various pathogenic bacteria, is safe and does not change color; meanwhile, the latex paint still has good conventional performance on the premise of obvious antibacterial effect, meets the requirements of consumers in various aspects, provides a safe and non-discoloring antibacterial latex paint composition for consumers, and completes the invention on the basis.

The technical concept of the invention is as follows:

in order to solve the problems that the long-term effect is influenced and the color of the emulsion paint is changed due to the dissolution consumption of the antibacterial agent, a formula method of physically adding the antibacterial agent is abandoned, and the polymer emulsion with the antibacterial function is selected. The polymer binds the antibacterial agent on macromolecules by a special chemical method to realize uniform distribution, thereby improving the utilization efficiency. Moreover, the anchoring effect realizes the controlled slow release of silver ions, thereby solving the problem of color change on one hand and realizing the long-term effect of the sterilization function on the other hand. In addition, the antibacterial agent is bound on macromolecules, so that the antibacterial agent cannot be dissolved out, and the risk of human body contact injury is solved.

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 amount of dilution includes, but is not limited to, between 25 and 35%.

Herein, "polymer emulsion" refers to a polymer emulsion to which a silver antimicrobial agent is coupled by a chemical method. And the emulsion is subjected to a physical stripping treatment to remove residual monomers and odor.

The invention provides a low-odor long-acting antibacterial emulsion paint composition, which selects polymer emulsion with an antibacterial function, hereinafter referred to as emulsion, and can effectively sterilize for a long time. The composition mainly comprises the following components in parts by weight: 28-38 parts of emulsion; 25-40 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 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 500-800 revolutions per minute;

b) Then adding coating auxiliary agent (cellulose 0.2-0.3 weight portion; and 0.1 to 0.15 parts by weight of a pH regulator) 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, dispersing for 20-25 minutes, and keeping the pulp temperature not to exceed 55 ℃;

e) After the dispersion is finished, reducing the rotating speed to 600-800 revolutions per minute, adding the film forming auxiliary agent, and stirring 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) And finally adding water to adjust the viscosity to (95-105) KU, thus obtaining the finished product.

The weight composition of the components is as follows: 30-35 parts by weight of a film forming substance; 25-40 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 low odor, long lasting antimicrobial latex paint composition.

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 500-800 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, reducing the rotating speed to 600-800 r/min, sequentially adding the film-forming additive and the film-forming emulsion and stirring 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 6.4.21 in GB/T23999-2009, and the antibacterial property is carried out according to antibacterial effect I of HG/T3950-2007 antibacterial coatings.

Specific test results for examples 1,2,3 are given below in tables 3-8.

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 low odor, long lasting antimicrobial latex paint compositions of the present invention were tested for VOC and formaldehyde content according to GB18582-2020 "limits of hazardous materials in building wall coatings" and the results are shown in table 4.

TABLE 4

Item	Unit	Technical requirements	Example 1	Example 2	Example 3
						Free formaldehyde content	mg/kg	≤50	Not detected out	Not detected out	Not detected out
Volatile organic Compound content	g/L	≤80	Not detected out	Not detected out	Not detected out

The low odor, long lasting antimicrobial latex paint compositions of the present invention were tested for Total Volatile Organic Compound (TVOC) emissions according to JG/T481-2015, low Volatile Organic Compound (VOC) aqueous interior wall coating material, and the results are shown in table 5.

TABLE 5

The low-odor long-acting antibacterial latex paint composition of the invention is tested for antibacterial effect according to HG/T3950-2007 antibacterial paint, and the results are shown in tables 6 and 7.

TABLE 6

Item	Unit of	Technical requirements	Example 1	Example 2	Example 3
						Antibacterial properties	％	I≥99％；II≥90％	99.9％	99.9％	99.9％
Antibacterial durability	％	I≥95％；II≥85％	99.9％	99.9％	99.9％

TABLE 7

Item	Unit	Example 1	Example 2	Example 3	Commercial silver ion antibacterial paint
						Staphylococcus aureus (Staphylococcus aureus)	％	99.9％	99.9％	99.9％	99.9％
Escherichia coli	％	99.9％	99.9％	99.9％	99.9％
						Bacteriostatic ring	mm	0	0	0	14

In the 'coupling' technology of the invention in figure 1, the 'coupling' technology can not be dissolved out to generate a bacteriostatic circle picture, if silver ions are leaked out, the bacteriostatic circle can be generated, and the more the silver ions are leaked out, the larger the bacteriostatic circle is. The invention does not generate obvious inhibition mean circle, and the silver ions are bound in the paint film and cannot seep out, thereby ensuring the durability and the safety of the paint film.

Claims

1. A low odor, long lasting antimicrobial interior wall latex paint composition, comprising:

the film-forming material is aqueous acrylate polymer emulsion coupled with an active nano silver antibacterial agent;

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 low odor, long lasting antimicrobial interior wall latex paint composition according to claim 1, wherein said emulsion of film forming material is a carrier chemically coupled to an acrylate polymer chain with an active silver antimicrobial agent; the polymer emulsion has particle size distribution of 100-200 nm, glass transition temperature Tg of 15-25 deg.c and minimum film forming temperature MFFT of 10-22 deg.c.

3. The latex paint composition for interior walls, according to claim 1, characterized in that,

the pH regulator is an inorganic base neutralizer;

the dispersant is polyacrylate dispersant;

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

the film-forming aid is selected from: an organic ester film-forming assistant with a boiling point of more than 287 ℃ under the standard atmospheric pressure.

4. The low odor, long lasting antimicrobial interior wall latex paint composition of claim 1 wherein the thickener: pH regulator: wetting and 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) and (0-0.5).

5. The low odor, long lasting antimicrobial interior wall latex paint composition of claim 1 wherein the thickener: pH regulator: dispersing agent: defoaming agent: film-forming auxiliary agent: preservative: the weight ratio of the mildew preventive is as follows: (1.0-1.5), (0.1-0.2), (0.4-0.6), (0.4-0.8), (1.0-1.5), (0.3-0.5), (0.2-0.5).

6. The low odor, long lasting antimicrobial interior wall latex paint composition according to claim 1, wherein said composition comprises:

the film forming material is antibacterial emulsion adopting a silver antibacterial agent coupling technology;

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: (20-25), (4-8), (0-7.5);

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

the dispersant is sodium polyacrylate dispersant DispexAA4140;

the defoaming agent is FoamstarST2410 star polymer and Foamaster MO NXZ mineral oil, and the weight ratio is 1;

the thickening agent is a cellulose thickening agent Natrosol 250HBR and an inorganic rheological agent Attagel40; polyether thickener Rheovis PE1331 and polyacrylic thickener Rheovis HS1212, wherein the weight ratio is (2.5-4.0): 3.0: (4.0-8.0): (0.0-2.0);

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): (0-0.5).

7. A latex paint for interior walls made from the low odor, long lasting antimicrobial interior wall latex paint composition of claim 1.

8. The method for preparing the latex paint of claim 7, which is characterized by comprising the following steps: 28-38 parts of a film forming material; 25-40 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 germs attached to walls to reduce the risk of infection and transmission.