Environmentally friendly antibacterial colored sand and preparation method thereof

Abstract

The present invention belongs to the technical field of functional sand materials, and specifically relates to an environmentally friendly antibacterial colored sand and a preparation method thereof. The colored sand comprises the following components by weight: 100-120 parts of quartz sand; 1-2 parts of pigment; 5-10 parts of modified polyacrylate emulsion; 3-5 parts of antibacterial agent; 1-2 parts of auxiliary agent; the present invention uses modified polyacrylate emulsion as a binder to achieve a good dyeing effect on quartz sand, and obtains colored sand with good mechanical stability, water resistance, acid resistance, alkali resistance and aging resistance. At the same time, the modified polyacrylate and the antibacterial agent can also synergistically enhance the antibacterial performance of the colored sand. The obtained colored sand has excellent antibacterial performance, and no non-volatile organic solvent is used in the preparation process of the colored sand, which has the advantages of being green and environmentally friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of functional sand materials, and in particular relates to an environmentally friendly antibacterial colored sand and a preparation method thereof. Background Art

[0002] As a substitute for natural colored sand, artificial colored sand has the advantages of rich colors, stable performance and no fading, and is widely used in the field of architectural decoration. Artificial colored sand is mainly divided into dyed colored sand and high-temperature sintered colored sand. Dyed colored sand is mainly dyed by mixing organic dyes or resins with inorganic colorants. Its preparation method is simple and the cost is low, but its color resistance is poor and it is easy to fade. It is also prone to problems such as uneven coloring and easy agglomeration between particles. High-temperature sintered colored sand is made by mixing inorganic pigments and quartz sand and sintering them at high temperature. It has good anti-aging properties, but the preparation temperature is high, the energy consumption is large, and the cost is high, which limits its production and application. With the continuous improvement of social living standards, people's performance requirements for building decoration materials such as artificial colored sand are also getting higher and higher, and multifunctional artificial colored sand has become a research hotspot in the industry.

[0003] Chinese patent application with application number 202010026088.X discloses an antibacterial colored sand and a preparation method thereof, wherein the colored sand includes a base material, a binder and an antibacterial agent, wherein the binder includes water glass, and the antibacterial agent includes a titanium dioxide-based photocatalytic inorganic antibacterial agent, a zinc oxide-based photocatalytic inorganic antibacterial agent, a zinc oxide inorganic antibacterial agent, a copper oxide inorganic antibacterial agent or a lithium carbonate inorganic antibacterial agent, and a high-efficiency antibacterial effect is achieved through the synergistic effect of the binder and the antibacterial agent, but the antibacterial performance of the colored sand still has room for improvement; Chinese patent application with application number 202410281077.4 discloses an artificial colored Sand and a preparation method thereof. The artificial colored sand comprises sand to be dyed and a dye layer attached to the surface of the sand to be dyed. The dye layer is formed by a fast-curing solvent-free alkoxysilyl-modified polyether dyeing slurry, which is attached to the surface of the sand to be dyed by stirring and undergoes a curing reaction on the surface of the sand to be dyed under the condition of passing humid hot air. The prepared colored sand has good weather resistance, is not easy to fade, and has good color. However, it has a single function and cannot meet special use requirements. A large amount of non-volatile organic solvents are used in the preparation process, and the environmental protection is poor. Therefore, it is urgent to develop a functional and environmentally friendly colored sand with stable performance and excellent antibacterial performance. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly antibacterial colored sand and a preparation method thereof in view of the deficiencies in the prior art. The modified polyacrylate emulsion is used as a binder to achieve a good dyeing effect on quartz sand, and the colored sand with good mechanical stability, water resistance, acid resistance, alkali resistance and aging resistance is obtained. At the same time, the modified polyacrylate and the antibacterial agent can also synergistically enhance the antibacterial property of the colored sand, and the prepared colored sand has excellent antibacterial property.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0006] Disclosed is an environmentally friendly antibacterial colored sand, which comprises the following components in parts by weight: 100-120 parts of quartz sand; 1-2 parts of pigment; 5-10 parts of modified polyacrylate emulsion; 3-5 parts of antibacterial agent; and 1-2 parts of auxiliary agent.

[0007] Furthermore, the particle size of the quartz sand is 50-100 mesh.

[0008] Furthermore, the antibacterial agent is composed of antibacterial monomer and water in a mass ratio of 1:1-2.

[0009] Furthermore, the auxiliary agent is ethylene glycol or propylene glycol.

[0010] In the technical scheme of the present invention, the preparation method of the modified polyacrylate emulsion is: add water and antibacterial monomer into a reaction container, stir and dissolve, protect with nitrogen, heat to 60°C, add ammonium persulfate, maintain the temperature at 75-80°C, slowly drop the monomer mixture, continue to heat to 95°C, react for 1-1.5h, and after the reaction is completed, cool to obtain the modified polyacrylate emulsion.

[0011] Furthermore, the monomer mixture is composed of methyl methacrylate, butyl acrylate and acrylic acid in a mass ratio of 1:2-2.1:0.1-0.2; the amount of ammonium persulfate is 0.2-0.25% of the total mass of the monomer mixture and the antibacterial monomer; the mass ratio of the monomer mixture, the antibacterial monomer and water is 1:0.2-0.3:1.5-1.8.

[0012] In the technical solution of the present invention, the preparation method of the antibacterial monomer is:

[0013] (1) Add ethanol, p-chlorobenzyl alcohol and dodecyl dimethyl tertiary amine to a reaction vessel, stir evenly, heat to 80° C., react for 8-10 hours, and after the reaction is complete, cool, remove ethanol, extract with water and dichloromethane, and concentrate the aqueous phase under reduced pressure to obtain intermediate 1, the structural formula of which is:

[0014]

[0015] (2) Add toluene, intermediate 1, 4-chlorobutyric acid and p-toluenesulfonic acid to a reaction vessel, stir evenly, heat to 110° C., react for 4-6 hours, and after the reaction is complete, cool, remove toluene, extract with water and dichloromethane, and concentrate the aqueous phase under reduced pressure to obtain intermediate 2, the structural formula of which is:

[0016]

[0017] (3) Add acetonitrile, dimethylaminoethyl methacrylate and intermediate 2 to a reaction vessel, stir evenly, heat to 70-80° C., react for 6-8 hours, and after the reaction is complete, cool, remove acetonitrile, extract with water and dichloromethane, and concentrate the aqueous phase under reduced pressure to obtain an antibacterial monomer having the structural formula:

[0018]

[0019] Furthermore, the molar ratio of p-chlorobenzyl alcohol to dodecyldimethyl tertiary amine in step (1) is 1:1-1.1.

[0020] Furthermore, in step (2), the molar ratio of the intermediate 1,4-chlorobutyric acid and p-toluenesulfonic acid is 1:1-1.1:0.03-0.05.

[0021] Furthermore, in step (3), the molar ratio of dimethylaminoethyl methacrylate to intermediate 2 is 1:1-1.1.

[0022] The present invention also provides a method for preparing environmentally friendly antibacterial colored sand, comprising the following steps: firstly uniformly mixing the pigment, modified polyacrylate emulsion, antibacterial agent and auxiliary agent according to the mass ratio, then uniformly mixing with quartz sand, and drying to obtain the environmentally friendly antibacterial colored sand.

[0023] The present invention has the following beneficial effects:

[0024] In order to obtain an environmentally friendly antibacterial colored sand, the present invention first uses p-chlorobenzyl alcohol as a raw material, reacts with dodecyl dimethyl tertiary amine, 4-chlorobutyric acid, and dimethylaminoethyl methacrylate in sequence to obtain an antibacterial monomer containing a quaternary ammonium salt with an antibacterial effect, a long-chain quaternary ammonium salt group, and a methacrylic acid group in the structure. The present invention compounded the antibacterial monomer with water as an antibacterial agent, and further polymerized the antibacterial monomer with methyl methacrylate, butyl acrylate, and acrylic acid under the action of ammonium persulfate to form a modified polyacrylate emulsion. The prepared modified polyacrylate emulsion has a high solid content. It has good adhesion and water resistance. Its polyacrylate molecular chain contains antibacterial monomers. The long-chain quaternary ammonium salt groups give the antibacterial monomers and modified polyacrylates a certain dispersing effect, preventing the quartz sand from agglomerating when mixed with other components for dyeing, and can also make the quartz sand more fully and evenly dyed, thereby obtaining colored sand with stable comprehensive performance; multiple quaternary ammonium salt groups with antibacterial effects also give the antibacterial monomers and modified polyacrylates good antibacterial effects, so that the two can work synergistically and exert their multiple antibacterial effects, thereby greatly improving the antibacterial properties of colored sand.

[0025] The present invention uses the modified polyacrylate emulsion prepared by polymerization as a binder, can achieve a good dyeing effect on quartz sand, and obtain colored sand with good mechanical stability, water resistance, acid resistance, alkali resistance and aging resistance. At the same time, the modified polyacrylate and the antibacterial agent can also synergistically enhance the antibacterial property of the colored sand. The prepared colored sand has excellent antibacterial property. In the process of preparing the colored sand, no non-volatile organic solvent is used, the environment is good, and the green production process is met. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments; the technical features designed in different implementation modes of the present invention described below can be combined with each other as long as they do not conflict with each other; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] In the technical scheme of the present invention, the chemical reagents used are all commonly available on the market, the pigment is phthalocyanine red, methyl methacrylate CAS No. 80-62-6; butyl acrylate CAS No. 141-32-2; acrylic acid CAS No. 79-10-7; ammonium persulfate CAS No. 7727-54-0; p-chlorobenzyl alcohol CAS No. 873-76-7; dodecyl dimethyl tertiary amine CAS No. 112-18-5; 4-chlorobutyric acid CAS No. 627-00-9; p-toluenesulfonic acid CAS No. 104-15-4; dimethylaminoethyl methacrylate CAS No. 2867-47-2.

[0028] In the technical solution of the present invention, the preparation method of the antibacterial monomer is:

[0029] (1) Add 500 mL of ethanol, 15.0 g of p-chlorobenzyl alcohol and 22.5 g of dodecyl dimethyl tertiary amine to a reaction container, stir evenly, heat to 80° C., react for 10 h, and after the reaction is completed, cool, remove ethanol, extract with water and dichloromethane, and concentrate the aqueous phase under reduced pressure to obtain 32.8 g of intermediate 1; the molar ratio of p-chlorobenzyl alcohol to dodecyl dimethyl tertiary amine is 1:1; the reaction process is:

[0030]

[0031] Intermediate 1: ESI (m / z): 356.9 [M+H] + , 1H-NMR (600MHz, DMSO-d6, δppm): 7.28 (d, J=8.6Hz, 2H), 7.03 (d, J=8.6Hz, 2H), 5.27 (s, 1H), 4.61 (s, 2H), 3.72 (s, 6H), 3.22-3.25 (m, 2H), 1.71-1.74 (m, 2H), 1.26-1.30 (m, 18H), 0.88 (t, J=6.5Hz, 3H).

[0032] (2) Add 250 mL of toluene, 18.0 g of intermediate 1, 6.2 g of 4-chlorobutyric acid and 0.3 g of p-toluenesulfonic acid to a reaction vessel, stir evenly, heat to 110° C., react for 6 h, and after the reaction is completed, cool, remove toluene, extract with water and dichloromethane, and concentrate the aqueous phase under reduced pressure to obtain 20.4 g of intermediate 2; the molar ratio of intermediate 1, 4-chlorobutyric acid and p-toluenesulfonic acid is 1:1:0.03; the reaction process is:

[0033]

[0034] Intermediate 2: ESI (m / z): 461.5 [M+H] + , 1 H-NMR (600MHz, DMSO-d6, δppm): 7.28 (d, J=8.6Hz, 2H), 7.04 (d, J=8.6Hz, 2H), 5.20 (s, 2H), 3.72 (s, 6H), 3.65-3 .68 (m, 2H), 3.23-3.25 (m, 2H), 2.32-2.36 (m, 2H), 1.75-1.80 (m, 4H), 1.26-1.30 (m, 18H), 0.88 (t, J=6.5Hz, 3H).

[0035] (3) Add 200 mL of acetonitrile, 5.1 g of dimethylaminoethyl methacrylate and 15.0 g of intermediate 2 to a reaction container, stir evenly, heat to 80° C., react for 8 h, cool after the reaction is complete, remove acetonitrile, extract with water and dichloromethane, and concentrate the aqueous phase under reduced pressure to obtain 16.5 g of antibacterial monomer; the molar ratio of dimethylaminoethyl methacrylate to intermediate 2 is 1:1; the reaction process is:

[0036]

[0037] Antibacterial monomer: ESI (m / z): 618.7 [M+H] + , 1H-NMR (600MHz, DMSO-d6, δppm): 7.29 (d, J=8.6Hz, 2H), 7.03 (d, J=8.6Hz, 2H) , 6.42-6.46(m, 2H), 5.22(s, 2H), 4.59-4.62(m, 2H), 3.72(s, 6H), 3.52-3.55 (m, 2H), 3.30 (s, 6H), 3.23-3.25 (m, 4H), 2.32-2.35 (m, 2H), 2.21-2.24 (m, 2H ), 2.01 (s, 3H), 1.75-1.80 (m, 2H), 1.26-1.30 (m, 18H), 0.88 (t, J=6.5Hz, 3H).

[0038] Example 1

[0039] An environmentally friendly antibacterial colored sand comprises the following components in parts by weight: 120 parts of quartz sand; 2 parts of pigment; 10 parts of modified polyacrylate emulsion; 4 parts of antibacterial agent; 2 parts of auxiliary agent; the particle size of the quartz sand is 100 meshes; the antibacterial agent is composed of an antibacterial monomer and water in a mass ratio of 1:1; and the auxiliary agent is ethylene glycol.

[0040] The preparation method of the modified polyacrylate emulsion is as follows: add water and antibacterial monomer into a reaction container, stir and dissolve, protect with nitrogen, heat up to 60°C, add ammonium persulfate, maintain the temperature at 80°C, slowly drop the monomer mixture, continue to heat up to 95°C, react for 1.5 hours, cool after the reaction is completed, and obtain the modified polyacrylate emulsion. The solid content is 43.2% as measured by reference to standard GB / T1725-79; the monomer mixture is composed of methyl methacrylate, butyl acrylate and acrylic acid in a mass ratio of 1:2.1:0.2; the amount of ammonium persulfate is 0.25% of the total mass of the monomer mixture and the antibacterial monomer; the mass ratio of the monomer mixture, the antibacterial monomer and water is 1:0.2:1.5.

[0041] A method for preparing environmentally friendly antibacterial colored sand comprises the following steps: firstly uniformly mixing pigment, modified polyacrylate emulsion, antibacterial agent and auxiliary agent according to mass ratio, then uniformly mixing with quartz sand, and drying to obtain environmentally friendly antibacterial colored sand.

[0042] Example 2

[0043] An environmentally friendly antibacterial colored sand comprises the following components in parts by weight: 110 parts of quartz sand; 1 part of pigment; 8 parts of modified polyacrylate emulsion; 5 parts of antibacterial agent; 1.5 parts of auxiliary agent; the particle size of the quartz sand is 80 meshes; the antibacterial agent is composed of an antibacterial monomer and water in a mass ratio of 1:2; and the auxiliary agent is propylene glycol.

[0044] The preparation method of the modified polyacrylate emulsion is as follows: add water and antibacterial monomer into a reaction container, stir and dissolve, protect with nitrogen, heat up to 60°C, add ammonium persulfate, maintain the temperature at 75°C, slowly drop the monomer mixture, continue to heat up to 95°C, react for 1.3 hours, cool after the reaction is completed, and obtain the modified polyacrylate emulsion. The solid content is 42.4% as measured by reference to standard GB / T1725-79; the monomer mixture is composed of methyl methacrylate, butyl acrylate and acrylic acid in a mass ratio of 1:2:0.1; the amount of ammonium persulfate is 0.23% of the total mass of the monomer mixture and the antibacterial monomer; the mass ratio of the monomer mixture, the antibacterial monomer and water is 1:0.3:1.7.

[0045] The preparation method of an environmentally friendly antibacterial colored sand is the same as that in Example 1.

[0046] Example 3

[0047] An environmentally friendly antibacterial colored sand comprises the following components in parts by weight: 100 parts of quartz sand; 1.5 parts of pigment; 5 parts of modified polyacrylate emulsion; 3 parts of antibacterial agent; 1 part of auxiliary agent; the particle size of the quartz sand is 60 meshes; the antibacterial agent is composed of antibacterial monomer and water in a mass ratio of 1:1.5; and the auxiliary agent is ethylene glycol.

[0048] The preparation method of the modified polyacrylate emulsion is as follows: add water and antibacterial monomer into a reaction container, stir and dissolve, protect with nitrogen, heat up to 60°C, add ammonium persulfate, maintain the temperature at 80°C, slowly drop the monomer mixture, continue to heat up to 95°C, react for 1h, cool after the reaction is completed, and obtain the modified polyacrylate emulsion, and its solid content is 41.5% measured by referring to the standard GB / T1725-79; the monomer mixture is composed of methyl methacrylate, butyl acrylate and acrylic acid in a mass ratio of 1:2:0.15; the amount of ammonium persulfate is 0.2% of the total mass of the monomer mixture and the antibacterial monomer; the mass ratio of the monomer mixture, the antibacterial monomer and water is 1:0.3:1.8.

[0049] The preparation method of an environmentally friendly antibacterial colored sand is the same as that in Example 1.

[0050] Example 4

[0051] An environmentally friendly antibacterial colored sand comprises the following components in parts by weight: 120 parts of quartz sand; 1.5 parts of pigment; 8 parts of modified polyacrylate emulsion; 4 parts of antibacterial agent; 1 part of auxiliary agent; the particle size of the quartz sand is 50 meshes; the antibacterial agent is composed of antibacterial monomer and water in a mass ratio of 1:1.5; and the auxiliary agent is propylene glycol.

[0052] The preparation method of the modified polyacrylate emulsion is as follows: add water and antibacterial monomer into a reaction container, stir and dissolve, protect with nitrogen, heat up to 60°C, add ammonium persulfate, maintain the temperature at 75°C, slowly drop the monomer mixture, continue to heat up to 95°C, react for 1.2 hours, cool after the reaction is completed, and obtain the modified polyacrylate emulsion. The solid content is 42.8% as measured by reference to standard GB / T1725-79; the monomer mixture is composed of methyl methacrylate, butyl acrylate and acrylic acid in a mass ratio of 1:2.1:0.1; the amount of ammonium persulfate is 0.2% of the total mass of the monomer mixture and the antibacterial monomer; the mass ratio of the monomer mixture, the antibacterial monomer and water is 1:0.25:1.6.

[0053] The preparation method of an environmentally friendly antibacterial colored sand is the same as that in Example 1.

[0054] Comparative Example 1

[0055] Compared with Example 1, this comparative example adopts polyacrylate emulsion.

[0056] An environmentally friendly antibacterial colored sand comprises the following components in parts by weight: 120 parts of quartz sand; 2 parts of pigment; 10 parts of polyacrylate emulsion; 4 parts of antibacterial agent; 2 parts of auxiliary agent; the particle size of the quartz sand is 100 meshes; the antibacterial agent is composed of an antibacterial monomer and water in a mass ratio of 1:1; and the auxiliary agent is ethylene glycol.

[0057] The preparation method of polyacrylate emulsion is as follows: add water into a reaction container, protect with nitrogen, heat up to 60°C, add ammonium persulfate, maintain the temperature at 80°C, slowly drop a monomer mixture, continue to heat up to 95°C, react for 1.5 hours, cool after the reaction is completed, and obtain polyacrylate emulsion; the monomer mixture consists of methyl methacrylate, butyl acrylate and acrylic acid in a mass ratio of 1:2.1:0.2; the amount of ammonium persulfate used is 0.25% of the mass of the monomer mixture; the mass ratio of the monomer mixture to water is 1:1.5.

[0058] The preparation method of an environmentally friendly antibacterial colored sand is the same as that in Example 1.

[0059] Comparative Example 2

[0060] Compared with Example 1, the same amount of water as that in the antibacterial agent was used to replace the antibacterial agent in this comparative example.

[0061] The invention discloses an environmentally friendly antibacterial colored sand, comprising the following components in parts by weight: 120 parts of quartz sand; 2 parts of pigment; 10 parts of modified polyacrylate emulsion; 2 parts of water; 2 parts of auxiliary agent; the particle size of the quartz sand is 100 meshes; and the auxiliary agent is ethylene glycol.

[0062] The preparation methods of the modified polyacrylate emulsion and the environmentally friendly antibacterial colored sand are the same as those in Example 1.

[0063] Comparative Example 3

[0064] Compared with Example 1, polyacrylate emulsion is used in this comparative example, and the same amount of water as that in the antibacterial agent is used to replace the antibacterial agent.

[0065] The invention discloses an environmentally friendly antibacterial colored sand, comprising the following components in parts by weight: 120 parts of quartz sand; 2 parts of pigment; 10 parts of polyacrylate emulsion; 2 parts of water; 2 parts of auxiliary agent; the particle size of the quartz sand is 100 meshes; and the auxiliary agent is ethylene glycol.

[0066] The preparation method of the polyacrylate emulsion is the same as that of Comparative Example 1.

[0067] The preparation method of an environmentally friendly antibacterial colored sand is the same as that in Example 1.

[0068] With reference to the standard JC / T 2328-2015, the performance tests were carried out on the colored sand prepared in Examples 1-4 and Comparative Examples 1-3, the mechanical stability test conditions were 1000r / min, stirring for 30min; the water resistance test time was 7d; the acid resistance test conditions were 10% sulfuric acid, 48h; the alkali resistance test conditions were 2% sodium hydroxide, 72h; the color difference of the samples after the test was observed respectively; the UV aging color fastness was tested with reference to the standard GB / 2424.14.C method UVA340 continuous irradiation for 60 days, the blue wool standard L7 fading reached level 4 exposure, and the color difference of the samples before and after exposure was tested; the results are shown in Table 1.

[0069] Table 1 Performance test results of colored sand

[0070]

[0071] The antibacterial properties of the colored sands prepared in Examples 1-4 and Comparative Examples 1-3 were tested with reference to standard GB / T 21510-2008. The results are shown in Table 2.

[0072] Table 2 Antibacterial performance test results of colored sand

[0073]

[0074]

[0075] It can be seen from the results in Table 1 that the colored sands prepared in Examples 1-4 of the present invention have good mechanical stability, water resistance, acid resistance, alkali resistance and aging resistance. Compared with Comparative Examples 1-3, the modified polyacrylate emulsion used in Example 1 of the present invention contains a long-chain quaternary ammonium salt structure on the polyacrylate molecular chain and in the antibacterial monomer in the antibacterial agent, which can play a dispersing role, prevent the quartz sand from agglomerating when mixed with other components for dyeing, and can also make the quartz sand more fully and evenly dyed, thereby obtaining colored sand with stable comprehensive performance.

[0076] From the results in Table 2, it can be seen that the colored sand prepared in Examples 1-4 of the present invention has good antibacterial properties against Staphylococcus aureus, Escherichia coli, Bacillus subtilis and Candida albicans. Compared with Comparative Examples 1-3, the modified polyacrylate emulsion used in Example 1 of the present invention contains multiple quaternary ammonium salt groups with antibacterial effects on the polyacrylate molecular chain and the antibacterial monomer in the antibacterial agent, and the two can work synergistically to exert their multiple antibacterial effects, thereby greatly improving the antibacterial properties of the colored sand.

[0077] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0078] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly antibacterial colored sand, characterized in that: The colored sand comprises the following components by weight: 100-120 parts of quartz sand; 1-2 parts of pigment; 5-10 parts of modified polyacrylate emulsion; 3-5 parts of antibacterial agent; 1-2 parts of auxiliary agent; the antibacterial agent is composed of antibacterial monomer and water in a mass ratio of 1:1-2; The preparation method of the modified polyacrylate emulsion is as follows: add water and antibacterial monomers into a reaction container, stir and dissolve, protect with nitrogen, heat up to 60°C, add ammonium persulfate, maintain the temperature at 75-80°C, slowly drop the monomer mixture, continue to heat up to 95°C after the drop is complete, react for 1-1.5h, cool after the reaction is complete, and obtain the modified polyacrylate emulsion; the monomer mixture is composed of methyl methacrylate, butyl acrylate, and acrylic acid in a mass ratio of 1:2-2.1:0.1-0.2; The structural formulas of the antibacterial monomers in the preparation methods of the antibacterial agent and the modified polyacrylate emulsion are: The preparation method of the antibacterial monomer is: (1) Add ethanol, p-chlorobenzyl alcohol and dodecyl dimethyl tertiary amine to a reaction vessel, stir evenly, heat to 80° C., react for 8-10 hours, and after the reaction is complete, cool, remove ethanol, extract with water and dichloromethane, and concentrate the aqueous phase under reduced pressure to obtain intermediate 1, the structural formula of which is: (2) Add toluene, intermediate 1, 4-chlorobutyric acid and p-toluenesulfonic acid to a reaction vessel, stir evenly, heat to 110° C., react for 4-6 hours, and after the reaction is complete, cool, remove toluene, extract with water and dichloromethane, and concentrate the aqueous phase under reduced pressure to obtain intermediate 2, the structural formula of which is: (3) Add acetonitrile, dimethylaminoethyl methacrylate and intermediate 2 to a reaction vessel, stir evenly, heat to 70-80° C., react for 6-8 hours, and after the reaction is completed, cool, remove acetonitrile, extract with water and dichloromethane, and concentrate the aqueous phase under reduced pressure to obtain an antibacterial monomer.

2. The environmentally friendly antibacterial colored sand according to claim 1, characterized in that: The molar ratio of p-chlorobenzyl alcohol to dodecyl dimethyl tertiary amine in step (1) is 1:1-1.1; the molar ratio of intermediate 1, 4-chlorobutyric acid and p-toluenesulfonic acid in step (2) is 1:1-1.1:0.03-0.05; the molar ratio of dimethylaminoethyl methacrylate to intermediate 2 in step (3) is 1:1-1.

1.

3. The environmentally friendly antibacterial colored sand according to claim 1, characterized in that: In the preparation method of the modified polyacrylate emulsion, the amount of ammonium persulfate used is 0.2-0.25% of the total mass of the monomer mixture and the antibacterial monomer; the mass ratio of the monomer mixture, the antibacterial monomer and water is 1:0.2-0.3:1.5-1.

8.

4. The environmentally friendly antibacterial colored sand according to claim 1, characterized in that: The particle size of the quartz sand is 50-100 meshes.

5. The environmentally friendly antibacterial colored sand according to claim 1, characterized in that: The auxiliary agent is ethylene glycol or propylene glycol.

6. A method for preparing the environmentally friendly antibacterial colored sand according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: firstly, according to the mass ratio, uniformly mixing the pigment, modified polyacrylate emulsion, antibacterial agent and auxiliary agent, then uniformly mixing with quartz sand, and after drying, obtaining environmentally friendly antibacterial colored sand.

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