CN115216163A - Inorganic electric heating coating material, preparation method and application thereof, and conductive fiber - Google Patents
Inorganic electric heating coating material, preparation method and application thereof, and conductive fiber Download PDFInfo
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Abstract
The invention discloses an inorganic electric heating coating material, a preparation method and application thereof, and conductive fibers, and belongs to the field of environment-friendly electric heating coatings. The inorganic electric heating coating material comprises the following components: the coating comprises a silicon dioxide aqueous solution, an aluminum hydroxide sol, a pH regulator, a surfactant K20, a film forming aid, an anti-settling filler, sericite, a leveling agent, a wear-resistant additive, an inorganic toner and conductive fibers. Wherein the conductive fiber comprises conductive polyvinyl alcohol fiber and AZO @ TiO 2 And (3) conductive crystals. The inorganic electric heating coating material does not contain organic components, has the functions of ultraviolet resistance, acid and alkali resistance, fire prevention and water prevention, is less influenced by temperature, has good weather resistance, and is environment-friendlyThe electric heating coating material can be widely applied to the fields of home decoration, petrochemical industry, scientific research, food, cultivation and the like, can be matched with solar energy and wind energy, and can also be applied to areas with severe environments such as plateau glaciers and the like.
Description
Technical Field
The invention relates to the field of environment-friendly electric heating coatings, in particular to an inorganic electric heating coating material, a preparation method and application thereof, and conductive fibers.
Background
The general heating coating on the market is prepared by mixing acrylic acid or other organic resin into graphene and conductive carbon black, stirring and coating the mixture on a substrate, and outputting stable constant voltage current through a transformer to heat the coating so as to generate heat energy. The coating has the following disadvantages: acrylic acid and organic resin are not high temperature resistant and have poor weather resistance, and after a period of time of use, the coating is easy to age and denature, then loses conductivity, cannot be used normally, and has poor durability. Moreover, due to the use of graphene and conductive carbon black, the coating is only black and matte, and cannot adapt to diversified scenes. In addition, organic resins cannot be used in food grade environments and do not have the properties of water and fire resistance.
Therefore, the development of the food-grade environment-friendly electrothermal coating which has the advantages of high temperature resistance, difficult aging and color change, no formaldehyde or other organic volatile solvents, difficult peeling, bulging and falling of the coating, and good weather resistance, and can be used for preparing different colors according to application scenes is very important.
Disclosure of Invention
The invention mainly aims to provide an electromechanical heating coating material, a preparation method and application thereof, and conductive fibers, and aims to solve the technical problems that the existing electromechanical heating coating material is easy to age and fade in a high-temperature environment, is poor in weather resistance, is difficult to adapt to application of diversified scenes due to single color and organic components which are not environment-friendly, and the like.
In order to achieve the aim, the invention provides an inorganic electric heating coating material which comprises the following components in parts by weight:
100-300 parts of silicon dioxide aqueous solution;
100-300 parts of aluminum hydroxide sol;
1-2 parts of a pH regulator;
1-3 parts of a surface active additive K20;
50-130 parts of a film-forming assistant;
10-20 parts of anti-settling filler;
30-80 parts of sericite;
1-3 parts of a leveling agent;
10-30 parts of a wear-resistant additive;
100-200 parts of conductive fibers;
100-150 parts of inorganic toner;
wherein the conductive fiber comprises conductive polyethyleneEnol fibres and AZO @ TiO 2 And (3) conductive crystals.
The adhesive force of the inorganic electric heating coating material is 0-1 grade, the fire-proof grade reaches A1 grade, the pencil hardness reaches more than 8H, and the heating efficiency reaches more than 96%.
Optionally, the conductive polyvinyl alcohol fiber is mixed with AZO @ TiO 2 The weight ratio of the conductive crystal is 1.5-3. Further alternatively, conductive polyvinyl alcohol fibers with AZO @ TiO 2 The weight ratio of the conductive crystal is 1:2
Optionally, the coalescing agent consists of 30-80 parts by weight of aluminum silicate, 10-30 parts by weight of sodium phosphate and 10-20 parts by weight of zinc oxide.
Optionally, the pH adjuster is at least one of hydrochloric acid, oxalic acid, and citric acid.
Optionally, the anti-settling filler is at least one of fumed silica, magnesium aluminum silicate, and hydroxyethyl cellulose.
Optionally, the leveling agent is at least one of boron nitride, modified dimethyl silicone oil and talcum powder, and the modified dimethyl silicone oil is alkyl modified dimethyl silicone oil.
Optionally, the wear-resistant additive is at least one of silicon carbide, silicon nitride, zirconia and nano alumina powder.
Optionally, at least one of titanium dioxide, iron oxide, cobalt blue, cadmium yellow, or cadmium red.
In order to achieve the aim, the invention also provides a conductive fiber for preparing an electric heating coating material, wherein the conductive fiber comprises conductive polyvinyl alcohol fiber and AZO @ TiO 2 And (4) conductive crystals.
In addition, in order to achieve the above object, the present invention also provides a preparation method of an inorganic electrothermal coating raw material, comprising the steps of:
s10, adjusting the aqueous solution of silicon dioxide to be acidic by using a pH regulator, mixing the aqueous solution of silicon dioxide with aluminum hydroxide sol, adding a surface active additive K20, and uniformly mixing to obtain a mixed solution;
s20, mixing the film forming auxiliary agent, the anti-settling filler, the sericite, the flatting agent, the wear-resisting additive and the inorganic toner, and grinding to obtain powder;
and S30, mixing the powder with the mixed solution, uniformly dispersing at 40-50 ℃, adding conductive fibers, and uniformly dispersing at 40-50 ℃ to obtain the inorganic heating coating material.
The invention also provides application of the inorganic electric heating coating material, and the inorganic electric heating coating material can be widely applied to various fields of home decoration, petrochemical industry, scientific research, food, cultivation and the like, is matched with solar energy and wind energy, and can also be applied to regions with severe environments such as plateau glaciers and the like.
The invention can realize the following beneficial effects:
the invention provides an inorganic electric heating coating material, which belongs to a pure inorganic electric heating material, does not contain organic components, has the functions of high temperature resistance, acid and alkali resistance, fire prevention and water prevention, is less influenced by temperature, has good weather resistance and is not easy to fade, is an environment-friendly electric heating coating material, can be widely applied to the fields of home decoration, petrochemical industry, scientific research, food, cultivation and the like, is matched with solar energy and wind energy, and can also be applied to regions with severe environment such as plateau glaciers and the like.
The invention adopts pure silicon dioxide as a main film forming substance, can form a layer of compact silicon dioxide film on the surface after curing, ensures that the product has good hardness and wear resistance, also avoids the harm of surface electric leakage, can be directly used as finish paint, does not need to additionally increase an emulsion paint coating, thereby improving the heat dissipation efficiency, saving energy, and can adjust the resistivity according to the thickness of the coating, realize the 36V low-pressure heating function and improve the use safety.
The invention adopts the conductive fiber prepared by conductive polyvinyl alcohol fiber and AZO @ TiO2 conductive crystal to replace the traditional conductive carbon black, not only can improve the acid and alkali resistance, weather resistance and heating rate of the product, but also can be adjusted by adding inorganic pigment to beautify the appearance of the product, breaks through the limitation that the coating only can be black and matte, and then can be applied to diversified scenes.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions in the prior art are briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a preparation method of an inorganic electric heating coating material of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Descriptions in this specification as relating to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to any indicated technical feature or quantity. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an inorganic electric heating coating material which comprises the following components in parts by weight:
100-300 parts of silicon dioxide aqueous solution;
100-300 parts of aluminum hydroxide sol;
1-2 parts of a pH regulator;
1-3 parts of a surface active additive K20;
50-130 parts of a film-forming assistant;
10-20 parts of anti-settling filler;
30-80 parts of sericite;
1-3 parts of a leveling agent;
10-30 parts of a wear-resistant additive;
100-200 parts of conductive fibers;
100-150 parts of inorganic toner;
wherein the conductive fiber comprises conductive polyvinyl alcohol fiber and AZO @ TiO 2 And (3) conductive crystals.
The polyvinyl alcohol fiber has the characteristics of high strength, high modulus, low elongation, wear resistance, acid and alkali resistance, good weather resistance and the like, and has good affinity and associativity.
The AZO @ TiO 2 The conductive crystal has good conductivity and ultraviolet resistance, high whiteness and easy coloring, and can obtain a product with diversified colors by adding inorganic fillers with different colors.
The AZO @ TiO 2 The conductive crystal and the conductive polyvinyl alcohol fiber are compounded, so that the conductive crystal and the conductive polyvinyl alcohol fiber play a role in synergy in the aspect of conductivity, the conductivity of the product is further enhanced, the heating efficiency of the product is improved, and meanwhile, the product is endowed with excellent weather resistance and hardness, so that the product is easier to color, and the possibility of diversification is realized.
Preferably, the conductive polyvinyl alcohol fiber is mixed with AZO @ TiO 2 The weight ratio of the conductive crystal is 1.5-3, and further preferably, the conductive polyvinyl alcohol fiber and AZO @ TiO are in a ratio of 1 2 The weight ratio of the conductive crystals is 1:2. Within the weight ratio range, the product has excellent conductivity and heating efficiency after film forming, and also has the advantages of good hardness and weather resistance, difficult peeling of a coating, uniform and consistent color and the like.
The invention also provides a conductive fiber used for preparing the electric heating coating material. The conductive fiber comprises conductive polyvinyl alcohol fiber and AZO @ TiO 2 The conductive crystal has the same beneficial effects as the conductive fiber in the inorganic electrothermal coating material, and the details are not repeated.
In the present invention, the conductive fiber is obtained by the following preparation method: mixing the conductive polyvinyl alcohol fiber with the AZO @ TiO 2 And mixing the conductive crystals, and uniformly stirring.
The invention provides a preparation method of the inorganic electric heating coating material, and referring to fig. 1, the preparation method of the inorganic electric heating coating material comprises the following steps:
and S10, adjusting the aqueous solution of the silicon dioxide to be acidic by using a pH regulator, mixing the aqueous solution of the silicon dioxide with the aluminum hydroxide sol, adding a surface active additive K20, and uniformly mixing to obtain a mixed solution.
In the invention, because the pH value of the silicon dioxide aqueous solution is close to 6-7 and the aluminum hydroxide sol is acidic, the silicon dioxide aqueous solution is adjusted to be acidic by using the pH adjusting agent, so that the acid-base environments of the silicon dioxide aqueous solution and the aluminum hydroxide sol tend to be the same, and the silicon dioxide aqueous solution are mixed at the moment, so that the floccule caused by the acid-base neutralization reaction can be avoided.
The invention adopts silicon dioxide aqueous solution as main film forming matter, and a layer of compact silicon dioxide film can be formed on the surface after curing, so that the product has good hardness and wear resistance, and the harm of surface electric leakage is avoided, and the product can be directly used as finish paint without adding emulsion paint coating, thereby improving the heat dissipation efficiency and saving energy. Moreover, the resistivity can be adjusted according to the thickness of the coating, so that the 36V low-voltage heating function is realized, and the use safety is improved. The thickness of the coating corresponding to the function of realizing 36V low-voltage heating is 120-150 mu m.
The present invention does not limit the kind of the pH adjustor, and preferably, the pH adjustor is at least one of hydrochloric acid, oxalic acid, and citric acid. The pH value of the silicon dioxide aqueous solution is adjusted to 2-5 by at least one acid-base regulator, and the silicon dioxide aqueous solution and the aluminum hydroxide sol can be mixed to obtain uniform mixed solution in an acidic environment.
Preferably, the invention further promotes the fusion between the silicon dioxide aqueous solution and the aluminum hydroxide sol by adding the surface active auxiliary agent K20, thereby improving the film forming effect of the product.
It is understood that the above-mentioned restriction of the kind of the pH adjuster and the range of the pH of the silica aqueous solution adjusted by the pH adjuster may be satisfied at the same time or may be satisfied only one of them, and as a preferred embodiment of the present invention, the above-mentioned simultaneous satisfaction can promote the fusion between the silica aqueous solution and the aluminum hydroxide sol to obtain a uniform mixed solution.
In this embodiment, the particle size of the particles in the aqueous silica solution is 40 to 60nm, and the particle size of the particles in the alumina sol is 10 to 30nm.
And S20, mixing the film forming auxiliary agent, the anti-settling filler, the sericite, the flatting agent, the wear-resisting additive and the inorganic pigment, and grinding to obtain uniform powder.
The invention does not limit the particle size of the powder, preferably, the particle size of the powder is ground to 30-60nm, the particle size range of the powder is similar to the particle size ranges of the silicon dioxide aqueous solution and the alumina sol, which is beneficial to forming a more uniform system, and the phenomena that the roughness of the final product is obvious, the coating is not easy to adhere and the orange peel is even easy to crack in long-term use due to overlarge particle size can be avoided.
Preferably, the film forming aid disclosed by the invention consists of 30-80 parts of aluminum silicate, 10-30 parts of sodium phosphate and 10-20 parts of zinc oxide. The film forming additive is prepared by mixing the components, so that the product has a better film forming effect.
The present invention is not limited with respect to the kind of the anti-settling filler, and preferably, the anti-settling filler is at least one of fumed silica, magnesium aluminum silicate, and hydroxyethyl cellulose. The application of at least one anti-settling filler can effectively prevent the reaction system from settling in the process of preparing the coating material.
In the embodiment, the sericite is added to promote the dispersibility of the components, so that a more uniform inorganic thermoelectric coating material can be obtained, the glossiness of the coating can be effectively improved, and the coating can be prevented from cracking.
The invention does not limit the type of the leveling agent, preferably, the leveling agent can be at least one of boron nitride, modified dimethyl silicone oil and talcum powder, wherein the modified dimethyl silicone oil is alkyl modified dimethyl silicone oil, the fluidity of a product can be effectively improved by applying the at least one leveling agent, and further preferably, the leveling agent contains boron nitride, and the boron nitride can not only improve the fluidity of the product, but also enhance the mechanical property of the product.
In addition, the invention also does not limit the types of the wear-resistant additives, the wear-resistant additives can be at least one of silicon carbide, silicon nitride, ceramic powder, zirconia and nano alumina powder, and the wear resistance and the mechanical property of the product can be effectively improved by adding the wear-resistant additives.
The invention does not limit the kind of inorganic toner, which can be selected according to the need, preferably, the inorganic toner is any one of titanium dioxide, ferric oxide, cobalt blue, cadmium yellow or cadmium red.
And S30, mixing the mixed solution obtained in the step S10 with the powder obtained in the step S20, uniformly dispersing at 40-50 ℃, adding the conductive fibers, and uniformly dispersing at 40-50 ℃ to obtain the inorganic heat-generating coating material.
The invention does not limit the mode of uniform dispersion, and preferably, the invention adopts a high-speed disperser to stir and disperse, and the rotating speed of the stirring and dispersing is 2000-3000rpm.
In addition, the invention also does not limit the time for uniform dispersion, and preferably, the time for uniform dispersion of the mixed solution and the powder is 20-60min; the time for uniform dispersion after the conductive fiber is added is 10-30min.
It is noted that dispersing at 40-50 deg.C can avoid the problems of high viscosity, poor fluidity and slow film formation of the product caused by over-high temperature of each component.
It is understood that the above-mentioned limitations on the dispersion method and conditions may be satisfied simultaneously or only one of them may be satisfied, and as a preferred embodiment of the present invention, the above-mentioned simultaneous satisfaction can result in a more uniform and stable inorganic heating coating material.
The technical solutions of the present invention are further described in detail with reference to the following specific examples, which should be understood as merely illustrative and not limitative.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart of a method 1 for preparing an inorganic thermoelectric generation coating material according to an embodiment of the present invention.
In this embodiment, the preparation method of the inorganic thermoelectric generation coating material includes the following steps:
and S10, adjusting 300 parts of a silicon dioxide aqueous solution with the particle size of 50nm to pH =5 by using 1 part of oxalic acid, mixing the silicon dioxide aqueous solution with 200 parts of aluminum hydroxide sol with the particle size of 10nm, adding 1 part of surface active additive K20, and uniformly stirring to obtain a mixed solution.
S20, mixing 40 parts of aluminum silicate, 30 parts of sodium phosphate, 20 parts of zinc oxide, 20 parts of fumed silica, 50 parts of sericite, 2 parts of boron nitride, 20 parts of silicon nitride and 100 parts of cobalt blue, and performing ball milling by using a ball mill to obtain uniform powder with the particle size of 60 nm.
And S30, mixing the mixed solution obtained in the step S10 and the powder obtained in the step S20, placing the mixture in a high-speed dispersion machine, stirring the mixture at the rotating speed of 3000rpm for 40min at the temperature of 40 ℃, uniformly dispersing the mixture, then adding 150 parts of conductive fibers, stirring the mixture at the rotating speed of 3000rpm at the temperature of 40 ℃ for 20min, and uniformly dispersing the mixture to obtain the inorganic electric heating coating material. The inorganic electric heating coating is blue.
The conductive fiber in the embodiment is obtained by the following steps: according to the weight portion, 50 portions of conductive polyvinyl alcohol fiber and 100 portions of AZO @ TiO are mixed 2 And mixing the conductive crystals, and uniformly stirring to obtain the conductive fiber.
Example 2
Referring to fig. 1, fig. 1 is a schematic flow chart of a method 2 for preparing an inorganic electric heating coating material according to an embodiment of the present invention.
In this embodiment, the preparation method of the inorganic thermoelectric generation coating material includes the following steps:
s10, adjusting 200 parts of a silicon dioxide aqueous solution with the particle size of 50nm to pH =4 by using 2 parts of oxalic acid, mixing the silicon dioxide aqueous solution with 300 parts of aluminum hydroxide sol with the particle size of 20nm, adding 2 parts of a surface active additive K20, and uniformly stirring to obtain a mixed solution.
S20, mixing 40 parts of aluminum silicate, 10 parts of sodium phosphate, 10 parts of zinc oxide, 10 parts of fumed silica, 10 parts of magnesium aluminum silicate, 30 parts of sericite, 3 parts of boron nitride, 30 parts of silicon carbide and 150 parts of cadmium yellow by weight, and performing ball milling by using a ball mill to obtain uniform powder with the particle size of 40 nm.
And S30, mixing the mixed solution obtained in the step S10 and the powder obtained in the step S20 according to parts by weight, placing the mixture in a high-speed dispersion machine, stirring the mixture for 20min at the rotating speed of 2000rpm at the temperature of 50 ℃, uniformly dispersing the mixture, then adding 100 parts of conductive fibers, stirring the mixture for 10min at the rotating speed of 2000rpm at the temperature of 50 ℃, and uniformly dispersing the mixture to obtain the inorganic electric heating coating material, wherein the inorganic electric heating coating material is yellow.
Wherein, the conductive fiber in the embodiment is obtained by the following steps: according to the weight portion, 40 portions of conductive polyvinyl alcohol fiber 60 portions of AZO @ TiO 2 And mixing the conductive crystals, and uniformly stirring to obtain the conductive fiber.
Example 3
Referring to fig. 1, fig. 1 is a schematic flow chart of a method 3 for preparing an inorganic electric heating coating material according to an embodiment of the present invention.
In this embodiment, the preparation method of the inorganic thermoelectric generation coating material includes the following steps:
and S10, adjusting 100 parts of a silicon dioxide aqueous solution with the particle size of 40nm to pH =2 by using 2 parts of hydrochloric acid, mixing with 200 parts of an aluminum hydroxide sol with the particle size of 20nm, adding 3 parts of a surface active additive K20, and uniformly stirring to obtain a mixed solution.
S20, mixing 80 parts of aluminum silicate, 30 parts of sodium phosphate, 20 parts of zinc oxide, 20 parts of hydroxyethyl cellulose, 60 parts of sericite, 2 parts of boron nitride, 1 part of modified dimethyl silicone oil, 20 parts of nano-alumina powder and 100 parts of cobalt blue, and performing ball milling by using a ball mill to obtain uniform powder with the particle size of 60 nm.
And S30, mixing the mixed solution obtained in the step S10 and the powder obtained in the step S20, placing the mixture in a high-speed dispersion machine, stirring the mixture for 40min at the rotating speed of 2500rpm under the condition of 45 ℃, uniformly dispersing the mixture, then adding 200 parts of conductive fibers, stirring the mixture for 20min at the rotating speed of 2500rpm under the condition of 45 ℃, uniformly dispersing the mixture, and obtaining the inorganic electro-thermal coating material, wherein the product is blue.
Wherein, the conductive fiber in the embodiment is obtained by the following steps: according to the weight portion, 50 portions of conductive polyvinyl alcohol fiber and 150 portions of AZO @ TiO 2 And mixing the conductive crystals, and uniformly stirring to obtain the conductive fiber.
Example 4
Referring to fig. 1, fig. 1 is a schematic flow chart of a method 4 for preparing an inorganic electric heating coating material according to the present invention.
In this embodiment, the preparation method of the inorganic thermoelectric generation coating material includes the following steps:
s10, adjusting 250 parts of a 60 nm-sized aqueous silica solution to pH =3 with 1 part of hydrochloric acid and 1 part of citric acid, mixing with 100 parts of 30 nm-sized aluminum hydroxide sol, adding 2 parts of a surfactant K20, and stirring uniformly to obtain a mixed solution.
S20, mixing 60 parts of aluminum silicate, 10 parts of sodium phosphate, 20 parts of zinc oxide, 10 parts of fumed silica, 80 parts of sericite, 1 part of talcum powder, 1 part of modified dimethyl silicone oil, 20 parts of zirconium oxide and 150 parts of cadmium yellow, and performing ball milling by using a ball mill to obtain uniform powder with the particle size of 40 nm.
And S30, mixing the mixed solution obtained in the step S10 and the powder obtained in the step S20, placing the mixture in a high-speed dispersion machine, stirring the mixture for 60 minutes at the rotating speed of 2000rpm under the condition of 40 ℃, uniformly dispersing the mixture, then adding 160 parts of conductive fibers, stirring the mixture for 30 minutes at the rotating speed of 2000rpm under the condition of 40 ℃, and uniformly dispersing the mixture to obtain the inorganic electric heating coating material, wherein the inorganic electric heating coating material is yellow.
The conductive fiber in the embodiment is obtained by the following steps: according to the weight portion, 40 portions of conductive polyvinyl alcohol fiber and 120 portions of AZO @ TiO are mixed 2 And mixing the conductive crystals, and uniformly stirring to obtain the conductive fiber.
Example 5
Referring to fig. 1, fig. 1 is a schematic flow chart of a method 5 for preparing an inorganic electric heating coating material according to the present invention.
In this embodiment, the preparation method of the inorganic thermoelectric generation coating material includes the following steps:
and S10, adjusting 150 parts of a silicon dioxide aqueous solution with the particle size of 40nm to pH =3 by using 1 part of oxalic acid and 1 part of citric acid, mixing the silicon dioxide aqueous solution with 300 parts of aluminum hydroxide sol with the particle size of 20nm, adding 1 part of a surface active additive K20, and uniformly stirring to obtain a mixed solution.
S20, mixing 50 parts of aluminum silicate, 20 parts of sodium phosphate, 10 parts of zinc oxide, 10 parts of fumed silica, 5 parts of hydroxyethyl cellulose, 40 parts of sericite, 1 part of boron nitride, 1 part of modified dimethyl silicone oil, 1 part of talcum powder, 15 parts of nano-alumina powder and 120 parts of cadmium red, and performing ball milling by using a ball mill to obtain uniform powder with the particle size of 60 nm.
And S30, mixing the mixed solution obtained in the step S10 and the powder obtained in the step S20, placing the mixture in a high-speed dispersion machine, stirring the mixture for 20min at the rotating speed of 3000rpm under the condition of 40 ℃, uniformly dispersing the mixture, then adding 180 parts of conductive fibers, stirring the mixture for 30min at the rotating speed of 2000rpm under the condition of 50 ℃, and uniformly dispersing the mixture to obtain the inorganic electric heating coating material, wherein the inorganic electric heating coating material is red.
The conductive fiber in the embodiment is obtained by the following steps: according to the weight portion, 60 portions of conductive polyvinyl alcohol fiber and 120 portions of AZO @ TiO are mixed 2 And mixing the conductive crystals, and uniformly stirring to obtain the conductive fiber.
Comparative example 1
Comparative example 1 was prepared substantially in the same manner as in example 1, except that the conductive fiber did not contain AZO @ TiO 2 Conductive crystals and equal parts by weight of conductive polyvinyl alcohol fibers.
Comparative example 2
Comparative example 2 was prepared substantially in the same manner as in example 1, except that the conductive fiber did not contain the conductive polyvinyl alcohol fiber, and AZO @ TiO was used in equal parts by weight 2 Conductive crystals are substituted.
Comparative example 3
Comparative example 3 was prepared substantially in the same manner as in example 1, except that the conductive fiber was obtained in the following manner: according to the weight portion, 30 portions of conductive polyvinyl alcohol fiber and 120 portions of AZO @ TiO are mixed 2 And mixing the conductive crystals, and uniformly stirring to obtain the conductive fiber. Namely, the conductive polyvinyl alcohol fiber and AZO @ TiO 2 The mass ratio of the conductive crystal is as follows: 1:4.
comparative example 4
Comparative example 4 was prepared substantially in the same manner as in example 1, except that the conductive fiber was replaced with an equal part by weight of conductive carbon black.
Comparative example 5
Comparative example 5 is prepared substantially the same as in example 1 except that sodium phosphate and zinc oxide are replaced with equal parts by weight of aluminum silicate.
Comparative example 6
In step S10, the aqueous silica solution is not adjusted to be acidic with a pH adjusting agent.
Performance test
The products of examples 1 to 5 and comparative examples 1 to 6 were coated on cold-rolled galvanized sheets to obtain coatings, the appearances of the coatings were observed, and the properties thereof were measured, and the test standards are shown in Table 1 and the test results are shown in Table 2.
TABLE 1 test standards
TABLE 2 comparison of the Properties of the products obtained in examples 1-5 and comparative examples 1-6
From table 2 it is found that:
from comparative examples 1 to 3, it can be seen that: the conductive fiber only contains AZO @ TiO 2 The conductive crystal only contains the conductive polyvinyl alcohol fiber, or the addition amount difference of the two raw materials is too large, the obtained product has the problems of unqualified appearance, slightly poor hardness, poor solvent resistance, heating efficiency which does not reach the level of more than 96 percent and only 88 percent, 89 percent and 91 percent respectively, and the like, and in addition, the conductive polyvinyl alcohol fiber also has great influence on the acid and alkali resistance of the product, which is discovered from the comparative example 2 and the comparative example 3.
Comparative example 4 the conductive fiber of the present invention was replaced with conventional conductive carbon black, the product could not exhibit blue color, the product could exhibit only black color of conductive carbon black itself, and the product had slightly poor acid and alkali resistance and fire resistance of only A2.
The film-forming aid in comparative example 5 contained only aluminum silicate, and compared with the film-forming aid obtained by combining aluminum silicate, sodium phosphate and zinc oxide in example 1, the film-forming effect was poor, resulting in the surface of the product being wavy, uneven in color, and poor in comprehensive properties, which was not a qualified product. Therefore, the combination of the aluminum silicate, the sodium phosphate and the zinc oxide as the film forming auxiliary agent can effectively improve the film forming effect of the product and further ensure the comprehensive performance of the product.
Comparative example 6 the aqueous silica solution was adjusted to be acidic without using a pH adjuster, and when the aqueous silica solution was mixed with an aluminum hydroxide sol, flocs were generated, directly resulting in a product having poor appearance and undesirable physicochemical properties.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (10)
1. An inorganic electric heating coating material is characterized by comprising the following components in parts by weight:
100-300 parts of silicon dioxide aqueous solution;
100-300 parts of aluminum hydroxide sol;
1-2 parts of a pH regulator;
1-3 parts of a surface active additive K20;
50-130 parts of a film-forming assistant;
10-20 parts of anti-settling filler;
30-80 parts of sericite;
1-3 parts of a leveling agent;
10-30 parts of a wear-resistant additive;
100-200 parts of conductive fibers;
100-150 parts of inorganic toner;
wherein the conductive fiber comprises conductive polyvinyl alcohol fiber and AZO @ TiO 2 And (4) conductive crystals.
2. The inorganic thermoelectric heating coating material of claim 1, wherein the conductive polyvinyl alcohol fiber is mixed with azo @ tio 2 The weight ratio of the conductive crystal is 1.5-3.
3. The inorganic heat generating coating material according to claim 1, wherein the film-forming aid consists of 30 to 80 parts by weight of aluminum silicate, 10 to 30 parts by weight of sodium phosphate and 10 to 20 parts by weight of zinc oxide.
4. The inorganic thermoelectric coating material of claim 1, wherein the pH adjuster is at least one of hydrochloric acid, oxalic acid, and citric acid.
5. The inorganic thermoelectric coating material of claim 1, wherein the anti-settling filler is at least one of fumed silica, magnesium aluminum silicate, and hydroxyethyl cellulose; and/or the flatting agent is at least one of boron nitride, modified dimethyl silicone oil and talcum powder.
6. The inorganic thermoelectric coating material of claim 1 wherein the wear-resistant additive is at least one of silicon carbide, silicon nitride, zirconia, nano-alumina powder.
7. The inorganic thermoelectric coating material of claim 1, wherein the inorganic toner is at least one of titanium dioxide, iron oxide, cobalt blue, cadmium yellow, or cadmium red.
8. A method for preparing the inorganic electric heating coating material of any one of claims 1 to 7, comprising the steps of:
adjusting the silicon dioxide aqueous solution to be acidic by using a pH regulator, then mixing the silicon dioxide aqueous solution with the aluminum hydroxide sol, adding the surface active auxiliary K20, and uniformly mixing to obtain a mixed solution;
mixing a film-forming auxiliary agent, an anti-settling filler, sericite, a flatting agent, a wear-resistant additive and inorganic toner, and grinding to obtain powder;
and mixing the powder with the mixed solution, uniformly dispersing at 40-50 ℃, adding conductive fibers, and uniformly dispersing at 40-50 ℃ to obtain the inorganic electrothermal coating material.
9. A conductive fiber for preparing electric heating coating material is characterized by comprising conductive polyvinyl alcohol fiber and AZO @ TiO 2 And (3) conductive crystals.
10. Use of the inorganic electrothermal coating material according to any one of claims 1 to 7 in the fields of home decoration, petrochemical industry, scientific research, food and cultivation.
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