阅读说明：本技术 一种二氧化锆基水性导电丙烯酸乳液及其制备方法 (Zirconium dioxide-based waterborne conductive acrylic emulsion and preparation method thereof ) 是由 许银梅 于 2021-10-22 设计创作，主要内容包括：本发明公开了一种二氧化锆基水性导电丙烯酸乳液,在制备过程中,将纳米二氧化锆加入至乙醇溶液中,超声分散,滴加乙烯基偶联剂搅拌,抽滤得到预处理纳米二氧化锆；向预处理纳米二氧化锆加入丙烯酸、水混合,氮气保护下加入过硫酸钾,搅拌反应,过滤,洗涤,干燥至恒重,得到接枝二氧化锆；将接枝二氧化锆、乳化剂、消泡剂、柔软剂、水混合,超声分散,加入过硫酸铵搅拌,加入丙烯酸正丁酯、甲基丙烯酸羟乙酯、碳系导电物继续搅拌得到二氧化锆基水性导电丙烯酸乳液。相比传统的水性导电涂料,本发明具有更好的亲水性,涂料长期稳定分散好,涂膜在保证导电性的基础上,涂层厚度小,同时具有良好的力学性能,抗冲击好,进一步提升了涂料的相关性能。(The invention discloses a zirconium dioxide-based aqueous conductive acrylic emulsion, which is prepared by adding nano zirconium dioxide into an ethanol solution, ultrasonically dispersing, dropwise adding a vinyl coupling agent, stirring, and performing suction filtration to obtain pretreated nano zirconium dioxide; adding acrylic acid and water into the pretreated nano zirconium dioxide, mixing, adding potassium persulfate under the protection of nitrogen, stirring for reaction, filtering, washing, and drying to constant weight to obtain grafted zirconium dioxide; mixing the grafted zirconium dioxide, an emulsifier, a defoaming agent, a softening agent and water, performing ultrasonic dispersion, adding ammonium persulfate, stirring, adding n-butyl acrylate, hydroxyethyl methacrylate and a carbon-series conductor, and continuously stirring to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion. Compared with the traditional water-based conductive coating, the coating has better hydrophilicity, good long-term stable dispersion, small coating thickness on the basis of ensuring the conductivity of a coating film, good mechanical property and good impact resistance, and the related properties of the coating are further improved.)

1. The zirconium dioxide-based waterborne conductive acrylic emulsion is characterized by comprising the following raw materials in parts by weight: 5-10 parts of n-butyl acrylate, 1-5 parts of hydroxyethyl methacrylate, 10-30 parts of acrylic acid, 0.1-1 part of potassium persulfate, 10-20 parts of nano zirconium dioxide, 1-2 parts of vinyl coupling agent, 5-10 parts of carbon-series conductor, 1-2 parts of emulsifier, 1-2 parts of defoaming agent and 1-2 parts of softening agent.

2. The zirconium dioxide-based aqueous conductive acrylic emulsion according to claim 1, wherein the carbon-based conductive material is at least one of conductive carbon black, graphite, carbon nanotubes, graphene and carbon fibers.

3. The zirconium dioxide-based aqueous conductive acrylic emulsion according to claim 1, wherein the vinyl coupling agent is vinyltrimethoxysilane.

4. The zirconium dioxide-based aqueous conductive acrylic emulsion according to claim 1, wherein the softening agent is at least one of a polysiloxane microemulsion, an amino polysiloxane emulsion or microemulsion, a polyether-modified polysiloxane emulsion, an epoxy-modified polysiloxane, and a carboxyl-modified polysiloxane.

5. The zirconia-based aqueous conductive acrylic emulsion according to claim 1, wherein the defoaming agent is at least one of polysiloxane, polydimethylsiloxane, and a glycol solution of 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol.

6. The zirconium dioxide-based aqueous conductive acrylic emulsion according to claim 1, wherein the emulsifier is an anionic emulsifier, preferably at least one of sodium dodecyl sulfate, sodium oleate, sodium abietate, sodium laurate, sodium dodecyl benzene sulfonate, and sodium alkylphenol polyether sulfosuccinic acid monoester salt.

7. The method for preparing the zirconium dioxide-based aqueous conductive acrylic emulsion according to claim 1, comprising the steps of:

s1, adding the nano zirconium dioxide into an ethanol solution, ultrasonically dispersing for 1-2h, dropwise adding a vinyl coupling agent under the stirring state at 50-70 ℃, continuously stirring, and performing suction filtration to remove a solvent to obtain pretreated nano zirconium dioxide;

s2, adding acrylic acid and water into the pretreated nano zirconium dioxide, mixing, adding potassium persulfate under the protection of nitrogen, stirring and reacting for 1-2h at 60-70 ℃, filtering, washing, and drying to constant weight to obtain grafted zirconium dioxide;

s3, mixing the grafted zirconium dioxide, the emulsifier, the defoamer, the softener and water, performing ultrasonic dispersion for 10-20min, adding ammonium persulfate at 60-80 ℃, stirring for 2-6min, adding n-butyl acrylate, hydroxyethyl methacrylate and a carbon-series conductor, and continuously stirring to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion.

8. The method of claim 1, wherein the ethanol solution in S1 is 30-50 wt%.

9. The method of claim 1, wherein the drying temperature of S2 is 80-100 ℃.

Technical Field

The invention relates to the technical field of conductive coatings, in particular to a zirconium dioxide-based aqueous conductive acrylic emulsion and a preparation method thereof.

Background

At present, the application field of the coating is very wide, the selection of the coating often plays a key role in the industries of building coating, furniture, vehicles, toys, ships and the like, and the conductive coating is a special functional coating which is rapidly developed along with modern scientific technology and has about half century development history. The conductive coating is prepared by adding a conductive material into a specific resin raw material to prepare a coating capable of being sprayed, and the coating can play a role of conductivity after being dried to form a paint film, so that the function of shielding electromagnetic wave interference is realized.

At present, the conductive coating has good conductivity, low cost, nontoxic or low-toxicity raw materials, high bonding fastness with a base material and convenient use, gradually replaces part of metal circuits, and is widely applied to the fields of intelligent textiles, photovoltaic industry, printed circuits, biosensors, electromagnetic shielding materials, ID cards, RFID antennas and the like. At present, the metal conductive paint and the carbon conductive material in the conductive paint are most widely applied, and the carbon conductive material is safe to use, so that the conductive paint can be applied to occasions contacting with human bodies, and is most widely applied at present.

At present, the water-based carbon-series conductor still has the defects of poor conductive stability, low conductive strength and poor water resistance, and the application range of the water-based carbon-series conductor is limited. Zirconium dioxide is the major oxide of zirconium, is chemically inert, and has the properties of high melting point, high electrical resistivity, high refractive index, and low coefficient of thermal expansion. At present, zirconium dioxide has attracted people's attention as a catalyst, a catalyst carrier, ceramics, an electrode and other materials, and the zirconium dioxide is added into a carbon-based conductive substance as a functional material, so that the conductivity of the conductive coating can be enhanced, and the zirconium dioxide has a good research prospect.

However, in the film forming process of conventional nano zirconium dioxide, the compatibility of the nano zirconium dioxide and polymer emulsion is poor, the nano zirconium dioxide is extremely easy to agglomerate in a system, the thickness of a conductive coating is large, the conductivity is unstable, the electromagnetic shielding effect is poor, the hydrophilicity is poor, and the adhesive force does not meet the requirements, so that the problem to be solved is urgently solved.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a zirconium dioxide-based aqueous conductive acrylic emulsion and a preparation method thereof.

A zirconium dioxide-based waterborne conductive acrylic emulsion comprises the following raw materials in parts by weight: 5-10 parts of n-butyl acrylate, 1-5 parts of hydroxyethyl methacrylate, 10-30 parts of acrylic acid, 0.1-1 part of potassium persulfate, 10-20 parts of nano zirconium dioxide, 1-2 parts of vinyl coupling agent, 5-10 parts of carbon-series conductor, 1-2 parts of emulsifier, 1-2 parts of defoaming agent and 1-2 parts of softening agent.

Preferably, the carbon-based conductor is at least one of conductive carbon black, graphite, carbon nanotubes, graphene, and carbon fibers.

Preferably, the vinyl coupling agent is vinyltrimethoxysilane.

Preferably, the softening agent is at least one of polysiloxane microemulsion, amino polysiloxane emulsion or microemulsion, polyether modified polysiloxane emulsion, epoxy modified polysiloxane and carboxyl modified polysiloxane.

Preferably, the defoaming agent is at least one of polysiloxane, polydimethylsiloxane and ethylene glycol solution of 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol.

Preferably, the emulsifier is an anionic emulsifier, preferably at least one of sodium dodecyl sulfate, sodium oleate, sodium abietate, sodium laurate, sodium dodecyl benzene sulfonate and sodium alkylphenol polyether sulfosuccinic acid monoester.

The preparation method of the zirconium dioxide-based waterborne conductive acrylic emulsion comprises the following steps:

s1, adding the nano zirconium dioxide into an ethanol solution, ultrasonically dispersing for 1-2h, dropwise adding a vinyl coupling agent under the stirring state at 50-70 ℃, continuously stirring, and performing suction filtration to remove a solvent to obtain pretreated nano zirconium dioxide;

s2, adding acrylic acid and water into the pretreated nano zirconium dioxide, mixing, adding potassium persulfate under the protection of nitrogen, stirring and reacting for 1-2h at 60-70 ℃, filtering, washing, and drying to constant weight to obtain grafted zirconium dioxide;

s3, mixing the grafted zirconium dioxide, the emulsifier, the defoamer, the softener and water, performing ultrasonic dispersion for 10-20min, adding ammonium persulfate at 60-80 ℃, stirring for 2-6min, adding n-butyl acrylate, hydroxyethyl methacrylate and a carbon-series conductor, and continuously stirring to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion.

Preferably, in S1, the mass fraction of the ethanol solution is 30-50%.

Preferably, in S2, the drying temperature is 80-100 ℃.

The technical effects of the invention are as follows:

(1) performing double-bond modification on the nano zirconium dioxide by adopting a vinyl coupling agent, introducing vinyl on the surface of the nano zirconium dioxide, and then reacting with acrylic acid to graft the nano zirconium dioxide on a polyacrylic acid molecular chain through a free radical reaction, wherein a stable covalent bond is formed between the nano zirconium dioxide and the polyacrylic acid molecular chain to obtain particles with good hydrophilic and dispersing properties;

(2) acrylic acid grafted zirconium dioxide is adopted, so that the dispersion performance of the zirconium dioxide in a system can be enhanced, and the conductivity can be improved; on one hand, the mechanical property of a polyacrylic acid molecular chain is improved through the good physical and mechanical properties of the metal oxide zirconium dioxide; meanwhile, the introduction of zirconium dioxide enlarges the pores among molecular chains, is more beneficial to the entry of water molecules, can effectively enhance the hydrophilic effect of the system, and obviously enhances the wettability of the emulsion;

(3) compared with the traditional water-based conductive coating, the coating obtained by the invention has better hydrophilicity, greatly reduced agglomeration, good long-term stable dispersion, large contact area among components, small coating thickness on the basis of ensuring conductivity of the coating after coating and drying, good mechanical property and good impact resistance, and further improves the related properties of the coating.

(4) The zirconium dioxide-based waterborne conductive acrylic emulsion has very wide application prospect in the application fields of catalysis, photoelectricity and ceramics.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.

Example 1

A preparation method of zirconium dioxide-based waterborne conductive acrylic emulsion comprises the following steps:

s1, adding 10kg of nano zirconium dioxide into 60kg of 30% ethanol solution, ultrasonically dispersing for 2h, dropwise adding 2kg of vinyl diethoxysilane under the stirring state at 50 ℃, continuously stirring for 20min, and performing suction filtration to remove the solvent to obtain pretreated nano zirconium dioxide;

s2, adding 30kg of acrylic acid and 40kg of water into the pretreated nano zirconium dioxide, mixing for 2 hours, adding 0.1kg of potassium persulfate under the protection of nitrogen, stirring and reacting for 1 hour at 70 ℃, filtering, washing with water for 4 times, and drying in an oven at 80 ℃ to constant weight to obtain grafted zirconium dioxide;

s3, mixing the grafted zirconium dioxide, 2kg of sodium abietate, 1kg of polysiloxane, 2kg of carboxyl modified polysiloxane and 30kg of water, ultrasonically dispersing for 20min, adding 1kg of ammonium persulfate at 60 ℃, stirring for 2min, adding 10kg of n-butyl acrylate, 1kg of hydroxyethyl methacrylate and 10kg of carbon fiber, and continuously stirring for 1h to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion.

Example 2

A preparation method of zirconium dioxide-based waterborne conductive acrylic emulsion comprises the following steps:

s1, adding 20kg of nano zirconium dioxide into 30kg of ethanol solution with the mass fraction of 50%, ultrasonically dispersing for 1h, dropwise adding 1kg of vinyl trimethoxy silane under the stirring state at 70 ℃, continuously stirring for 40min, and performing suction filtration to remove the solvent to obtain pretreated nano zirconium dioxide;

s2, adding 10kg of acrylic acid and 60kg of water into the pretreated nano zirconium dioxide, mixing for 1h, adding 1kg of potassium persulfate under the protection of nitrogen, stirring and reacting for 2h at the temperature of 60 ℃, filtering, washing with water for 2 times, and drying in an oven at the temperature of 100 ℃ to constant weight to obtain grafted zirconium dioxide;

s3, mixing the grafted zirconium dioxide, 1kg of sodium dodecyl benzene sulfonate, 2kg of polydimethylsiloxane, 1kg of polysiloxane microemulsion and 60kg of water, ultrasonically dispersing for 10min, adding 0.1kg of ammonium persulfate at 80 ℃, stirring for 6min, adding 5kg of n-butyl acrylate, 5kg of hydroxyethyl methacrylate and 5kg of graphene, and continuously stirring for 2h to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion.

Example 3

A preparation method of zirconium dioxide-based waterborne conductive acrylic emulsion comprises the following steps:

s1, adding 13kg of nano zirconium dioxide into 50kg of ethanol solution with the mass fraction of 35%, ultrasonically dispersing for 1.8h, dropwise adding 1.7kg of vinyl trimethoxy silane under the stirring state at 55 ℃, continuously stirring for 25min, and performing suction filtration to remove the solvent to obtain pretreated nano zirconium dioxide;

s2, adding 25kg of acrylic acid and 45kg of water into the pretreated nano zirconium dioxide, mixing for 1.7h, adding 0.2kg of potassium persulfate under the protection of nitrogen, stirring and reacting for 1.2h at 66 ℃, filtering, washing with water for 3 times, and drying in an oven at 95 ℃ to constant weight to obtain grafted zirconium dioxide;

s3, mixing the grafted zirconium dioxide, 1.3kg of sodium laurate, 1.8kg of ethylene glycol solution of 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol, 1.3kg of amino polysiloxane emulsion and 50kg of water, performing ultrasonic dispersion for 13min, adding 0.2kg of ammonium persulfate at 75 ℃, stirring for 5min, adding 6kg of n-butyl acrylate, 4kg of hydroxyethyl methacrylate and 6kg of carbon nano tubes, and continuously stirring for 1.7h to obtain the zirconium dioxide-based aqueous conductive acrylic emulsion.

Example 4

A preparation method of zirconium dioxide-based waterborne conductive acrylic emulsion comprises the following steps:

s1, adding 17kg of nano zirconium dioxide into 40kg of 45% ethanol solution, ultrasonically dispersing for 1.2h, dropwise adding 1.3kg of vinyl trimethoxy silane under the stirring state at 65 ℃, continuously stirring for 35min, and removing the solvent by suction filtration to obtain pretreated nano zirconium dioxide;

s2, adding 15kg of acrylic acid and 55kg of water into the pretreated nano zirconium dioxide, mixing for 1.3h, adding 0.8kg of potassium persulfate under the protection of nitrogen, stirring and reacting for 1.8h at 64 ℃, filtering, washing with water for 3 times, and drying in an oven at 85 ℃ to constant weight to obtain grafted zirconium dioxide;

s3, mixing the grafted zirconium dioxide, 1.7kg of sodium dodecyl sulfate, 1.2kg of polysiloxane, 1.7kg of epoxy modified polysiloxane and 40kg of water, ultrasonically dispersing for 17min, adding 0.8kg of ammonium persulfate at 65 ℃, stirring for 3min, adding 8kg of n-butyl acrylate, 2kg of hydroxyethyl methacrylate and 8kg of graphite, and continuously stirring for 1.3h to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion.

Example 5

A preparation method of zirconium dioxide-based waterborne conductive acrylic emulsion comprises the following steps:

s1, adding 15kg of nano zirconium dioxide into 45kg of 35-45% ethanol solution by mass, ultrasonically dispersing for 1.5h, dropwise adding 1.5kg of vinyl trimethoxy silane under the stirring state at 60 ℃, continuously stirring for 30min, and performing suction filtration to remove the solvent to obtain pretreated nano zirconium dioxide;

s2, adding 20kg of acrylic acid and 50kg of water into the pretreated nano zirconium dioxide, mixing for 1.5h, adding 0.5kg of potassium persulfate under the protection of nitrogen, stirring and reacting for 1.5h at 65 ℃, filtering, washing with water for 3 times, and drying in a 90 ℃ oven to constant weight to obtain grafted zirconium dioxide;

s3, mixing grafted zirconium dioxide, 1.5kg of alkylphenol polyether sulfosuccinic acid monoester sodium salt, 1.5kg of polydimethylsiloxane, 1.5kg of polyether modified polysiloxane emulsion and 45kg of water, ultrasonically dispersing for 15min, adding 0.5kg of ammonium persulfate at 70 ℃, stirring for 4min, adding 7kg of n-butyl acrylate, 3kg of hydroxyethyl methacrylate and 7kg of conductive carbon black, and continuously stirring for 1.5h to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion.

Comparative example 1

A preparation method of zirconium dioxide-based waterborne conductive acrylic emulsion comprises the following steps:

mixing 15kg of nano zirconium dioxide, 1.5kg of alkylphenol polyether sulfosuccinic acid monoester sodium salt, 1.5kg of polydimethylsiloxane, 1.5kg of polyether modified polysiloxane emulsion and 45kg of water, carrying out ultrasonic dispersion for 15min, adding 0.5kg of ammonium persulfate at 70 ℃, stirring for 4min, adding 7kg of n-butyl acrylate, 3kg of hydroxyethyl methacrylate and 7kg of conductive carbon black, and continuously stirring for 1.5h to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion.

Comparative example 2

A preparation method of zirconium dioxide-based waterborne conductive acrylic emulsion comprises the following steps:

s1, adding 15kg of nano zirconium dioxide into 20kg of acrylic acid and 50kg of water, mixing for 1.5h, adding 0.5kg of potassium persulfate under the protection of nitrogen, stirring and reacting for 1.5h at 65 ℃, filtering, washing with water for 3 times, and drying in a 90 ℃ oven to constant weight to obtain grafted zirconium dioxide;

s2, mixing grafted zirconium dioxide, 1.5kg of alkylphenol polyether sulfosuccinic acid monoester sodium salt, 1.5kg of polydimethylsiloxane, 1.5kg of polyether modified polysiloxane emulsion and 45kg of water, ultrasonically dispersing for 15min, adding 0.5kg of ammonium persulfate at 70 ℃, stirring for 4min, adding 7kg of n-butyl acrylate, 3kg of hydroxyethyl methacrylate and 7kg of conductive carbon black, and continuously stirring for 1.5h to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion.

Comparative example 3

A preparation method of silica-based waterborne conductive acrylic emulsion comprises the following steps:

s1, adding 15kg of nano silicon dioxide into 45kg of 35-45% ethanol solution by mass, ultrasonically dispersing for 1.5h, dropwise adding 1.5kg of vinyl trimethoxy silane under the stirring state at 60 ℃, continuously stirring for 30min, and removing the solvent by suction filtration to obtain pretreated nano silicon dioxide;

s2, adding 20kg of acrylic acid and 50kg of water into the pretreated nano silicon dioxide, mixing for 1.5h, adding 0.5kg of potassium persulfate under the protection of nitrogen, stirring and reacting for 1.5h at 65 ℃, filtering, washing with water for 3 times, and drying in a 90 ℃ oven to constant weight to obtain grafted silicon dioxide;

s3, mixing grafted silicon dioxide, 1.5kg of alkylphenol polyether sulfosuccinic acid monoester sodium salt, 1.5kg of polydimethylsiloxane, 1.5kg of polyether modified polysiloxane emulsion and 45kg of water, ultrasonically dispersing for 15min, adding 0.5kg of ammonium persulfate at 70 ℃, stirring for 4min, adding 7kg of n-butyl acrylate, 3kg of hydroxyethyl methacrylate and 7kg of conductive carbon black, and continuously stirring for 1.5h to obtain the silicon dioxide-based waterborne conductive acrylic emulsion.

Comparative example 4

A preparation method of aqueous conductive acrylic emulsion comprises the following steps:

mixing 1.5kg of alkylphenol polyether sulfosuccinic acid monoester sodium salt, 1.5kg of polydimethylsiloxane, 1.5kg of polyether modified polysiloxane emulsion and 45kg of water, performing ultrasonic dispersion for 15min, adding 0.5kg of ammonium persulfate at 70 ℃, stirring for 4min, adding 7kg of n-butyl acrylate, 3kg of hydroxyethyl methacrylate and 7kg of conductive carbon black, and continuously stirring for 1.5h to obtain the zirconium dioxide-based waterborne conductive acrylic emulsion.

Test example 1

The conductive acrylic emulsions obtained in example 5 and comparative examples 1 to 4 were subjected to a performance test by the following method:

(1) measuring the surface drying time and the actual drying time of the paint film according to GB/T16777-2008 'determination method for drying time of paint film and putty film';

(2) determining the adhesive force of the coating after film forming according to GB 9286-1998 Baige test standard;

(3) spraying the emulsion on a glass substrate which is 50mm multiplied by 50mm and 1mm thick and is wiped by ethanol by a seven-hole high-atomization paint spraying gun under the pressure of 0.3-0.5MPa, spraying a layer, curing for 2-3h at 80 ℃ to obtain a coating with the thickness of 15-25 mu m, spraying a layer, curing for 2-3h at 80 ℃ to obtain a sample to be tested with the coating, wherein the total thickness of the coating is 30-50 mu m. Placing a sample to be tested in water at 25 ℃, soaking a coating with the area of 2/3 in the water for 3d, observing the whitening and falling degree of the coating, observing the water resistance of the coating, taking out the sample, testing the contact angle of the soaked coating with the water at 25 ℃, comparing the contact angle with the contact angle before soaking, and observing the continuous hydrophilicity of the coating, wherein the contact angle is measured by a contact angle measuring instrument (model number is JGW-360A);

the results are as follows:

from the above table, it can be seen that: the conductive acrylic emulsion can be well formed into a film, the formed film layer has good hydrophilicity and water resistance, the hydrophilicity is improved after a long-time soaking test, and the conductive acrylic emulsion is a novel environment-friendly hydrophilic coating, is simple in preparation method and has good application prospects.

Test example 2

Respectively spraying the conductive acrylic emulsion obtained in the example 5 and the comparative examples 1-4 on a glass substrate which is 50mm multiplied by 50mm and 1mm thick and is wiped by ethanol by a seven-hole high-atomization paint spraying gun under the pressure of 0.3-0.5MPa, spraying a layer, curing at 80 ℃ for 2-3h to obtain a coating of 15-25 mu m, spraying a layer, curing at 80 ℃ for 2-3h to obtain a sample to be tested with the coating, and testing the conductivity by using RTS-9 double-electrical four-probe;

the conductive acrylic emulsion obtained in example 5 and comparative examples 1 to 4 was sprayed on the surface of cotton cloth by the same procedure as described above at 23 ±. + -

The shielding effectiveness is measured according to the measuring method of GB/T25471-2010 after being placed for 48 hours under the environment conditions of 2 ℃ and 50 +/-5% relative humidity, and the frequency range is 30MHz-1.5 GHz.

The results are as follows:

	surface resistance, Ω/sq	Shielding effectiveness, dB
			Example 5	0.34	52
Comparative example 1	1.26	36
			Comparative example 2	0.93	43
Comparative example 3	8.45	31
			Comparative example 4	12.56	28

From the above table, it can be seen that: the surface resistance of the conductive acrylic emulsion obtained by the invention is lowest, the conductivity is high, the surface resistance of the comparative example is higher than that of the example 5, and the conductivity is much worse; the conductive acrylic emulsion obtained by the invention has higher shielding efficiency on medium and high frequency electromagnetic waves, and the shielding effect is far better than that of a comparative example, which shows that the conductive coating can be applied to the field of electromagnetic shielding.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.