CN110157267B

CN110157267B - Preparation method of energy-saving emission-reducing functional coating and treatment method of core plate with holes

Info

Publication number: CN110157267B
Application number: CN201910461437.8A
Authority: CN
Inventors: 张巧云; 陈泽民; 于淑媛; 王树军; 张成根
Original assignee: Langfang Normal University
Current assignee: Langfang Aigema Xinli Material Technology Co ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2021-02-26
Anticipated expiration: 2039-05-30
Also published as: CN110157267A

Abstract

The invention discloses a preparation method of an energy-saving emission-reducing functional coating and a treatment method of a core plate with holes, wherein a solution I and a solution II are prepared, the solution II is dropwise added into the solution I and stirred, the solution I is stirred for 20min after the dropwise addition, sealed aging and drying are carried out to obtain dry gel, the dry gel is subjected to temperature programming control in a temperature programming resistance furnace to 550 ℃, and then is roasted for 2h, and the composite material is obtained by grinding; sequentially mixing water, propylene glycol, a dispersant, a wetting agent, a defoaming agent, a composite material and Cr₂O₃Stirring while adding the acrylic emulsion, the DPnB film-forming assistant, dibutyl phthalate, a rheology modifier, a thickening agent and silica sol in a mixing tank to disperse the mixture to obtain an energy-saving emission-reducing functional coating; and (3) putting the phosphorized core plate with the hole into the energy-saving emission-reducing functional coating for soaking and drying. The technology is used for processing the carrier core plate of the automobile air filter, so that the energy conservation and emission reduction of the motor vehicle can be realized, and meanwhile, the technology is convenient to use, high in efficiency, low in cost and wide in prospect.

Description

Preparation method of energy-saving emission-reducing functional coating and treatment method of core plate with holes

Technical Field

The invention relates to the technical field of preparation of functional coatings, in particular to a preparation method of an energy-saving and emission-reducing functional coating and a treatment method of a core plate with holes.

Background

With the continuous and high-speed development of the economy of China, the living standard of people is continuously improved, the automobile ownership is rapidly increased, particularly after WTO is added into China, the price of the automobile is greatly reduced, the automobile holding capacity is rapidly increased, the emission of tail gas after the automobile fuel oil is consumed is greatly increased, the resource and environmental protection problems are further highlighted, and the sustainable development of the economy and the society of China is restricted to a certain extent. The effective realization of energy conservation and emission reduction of automobiles becomes a problem which is urgently needed to be solved at present.

Regarding the research aspect of the energy saving and emission reduction problem of the automobile, the current thought can be summarized into three mixtures from the technical route of the new energy policy of the automobile: (1) combustion mixing, i.e. changing the existing engine structure; (2) fuel mixing, i.e. changing the existing fuel structure; (3) power mixing, i.e., the use of hybrid power and other alternative energy sources. The three aspects are actually a basic process of energy conservation and emission reduction, and cover the reformation of the prior art, the prior equipment and products. The tail gas is mainly generated by fuel oil of a gasoline engine and a gasoline vehicle in the aspects of emission reduction of COx, HC and NOx. The treatment device developed for tail gas according to different parts and different names generated by the fuel oil work of an engine in the world has more than 300 types, the treatment efficiency of most of the pollutants discharged by the whole vehicle can reach 5 percent at the highest, the treatment efficiency of most of the pollutants discharged by the whole vehicle is below 3 percent, and the treatment effect of seven devices can reach more than 10 percent of the pollutants discharged by the whole vehicle. The device is called as the most traditional, most classical and most treatment effect, and is a complete textbook type device, namely: (1) the treatment effect of the activated carbon tank which is researched at the earliest is 15-20% of the pollutant discharged by the whole vehicle from qualified products to high-quality products; (2) the treatment effect of the pollutant discharged by the whole vehicle of the positive ventilation metering valve (namely PCV) of the crankcase is 35-40%; (3) the treatment effect of the external fresh air breathing compensator which is developed and designed for the PVC valve is 10-15%; (4) the device is an exhaust circulation reburning device, and the treatment effect is more than 10 percent. The four-piece device is used for treating tail gas in a mode that gasoline mixed gas which is not burnt or burnt and is finally derived and converted into tail gas is discharged into an exhaust branch pipe, is reversely input into a cylinder for secondary reburning, so that the gasoline mixed gas is burnt completely, and the aim of treating tail gas is fulfilled to the maximum extent; (5) the device is a secondary feeding device, and the treatment efficiency is 10%; (6) the thermal reactor and the secondary feeding device are matched to play a role, and the treatment effect of the thermal reactor and the secondary feeding device is 15 percent in total; (7) the three-way catalyst, namely the international standard three-way catalyst, is called as a representative of the highest technology in the present generation, and the treatment effect is 10-15%. The treatment efficiency of no single device in the treatment modes can reach the Euro I (40-50% of pollutants discharged by the whole vehicle) to Euro IV (80-90%), and the treatment modes can meet any international specified standard by matching with the treatment modes.

The automobile tail gas backfire tank which is successfully developed by the empowerment of the national civil and private enterprises is a series of devices, wherein the first four devices which are designed and cast in an engine in the past and have the backfire function are respectively transplanted out of the engine from the engine, and the devices are modified and deformed to the effect of only keeping the functions of the devices without the prototype in a mode of treating internal diseases by treating the devices outside the engine. In particular to two sets of oil-gas-water separation and decomposition devices which are arranged at the bottom and the upper part of the inner top of an activated carbon tank. The quantitative timing control valve is used for controlling the quantitative timing of the tail waste gas to be input into the cylinder for the back combustion treatment, so that the optimal treatment effect is achieved. The problem of three kinds of series exhaust circulation reburning device of foreign design all exist jointly is solved, promptly: once the waste gas is delivered into the cylinder for combustion, the problems of cylinder temperature drop, flameout and difficult afterburning can be caused. Finally, when the aerospace combustion-supporting anti-explosion additive developed by the users is infiltrated into the granular activated carbon, the volume is expanded by 6-8 times in 72 hours, the treatment effect reaches 85-90% of the whole discharged pollutants, namely the Europe IV standard, and the treatment effect can reach the Europe V discharge standard (90-95%) by matching with an international standard three-way catalyst. The device is the treatment device with the highest treatment effect at present. In summary, currently, an absorption control system of activated carbon, a back-burning device and an exhaust gas purification device of noble metal platinum, palladium and rhodium three-way catalyst are arranged on an exhaust pipe at the same time for effectively treating the exhaust gas emission, so that the automobile manufacturing cost is increased, and the activated carbon or the catalyst needs to be replaced or activated regularly, so that the use cost is increased.

In the aspect of automobile energy-saving technology, an oxygen sensor is adopted to feed back the condition of combusted gas to a key element of an engine control unit in real time, and an electric injection system of the engine accurately controls the concentration of mixed gas according to a signal provided by the oxygen sensor so as to enable the mixed gas to reach the optimal air-fuel ratio. The method has the problems that the serious consequences are caused by over-rich or over-lean mixed gas, the oil consumption is increased after the sensor is aged, the power output of an engine is reduced, the emission exceeds the standard, an expensive catalytic conversion device is damaged, and the like.

Nano TiO2₂Composite materials (e.g., Ce/T)iO₂、La₂O₃/Al₂O₃/TiO₂、ZnO/TiO₂、ZrO₂/TiO₂、SnO₂/TiO₂、CuO/TiO₂Etc.) and performance studies are reported both at home and abroad. The preparation of the La and Ce doped nano TiO2 composite material and the energy-saving and emission-reducing effects of the load and the porous metal sheet support carrier of the automobile air filter are newly discovered, and are not reported at home and abroad.

Disclosure of Invention

The invention aims to provide a preparation method of an energy-saving emission-reducing functional coating and a treatment method of a core plate with holes, so that the energy conservation and emission reduction of an automobile are realized, and the coating is convenient to use, high in efficiency, low in cost, convenient to popularize and wide in prospect.

In order to achieve the aim, the invention provides a preparation method of an energy-saving emission-reducing functional coating and a treatment method of a core plate with holes, which comprises the following steps:

(1) nano La, Ce/TiO₂Preparing a composite material: firstly, dropwise adding butyl titanate into absolute ethyl alcohol under stirring to obtain a solution I, secondly, adding 0.05% of cerium nitrate into a mixed solution of absolute ethyl alcohol and concentrated hydrochloric acid in a volume ratio of 30:1, adding 0.125% of lanthanum nitrate solution into the mixed solution, fully mixing to obtain a solution II, dropwise adding the solution II into the solution I again, stirring, continuously stirring for 20min after dropwise adding is finished, sealing and aging for 15h at room temperature until the solution is completely converted into gel, putting the gel into a drying box for drying to obtain dried gel, finally, controlling the temperature of the dried gel in a temperature programming resistance furnace to 550 ℃, roasting for 2h, and grinding by a nano machine to obtain nano La, Ce/TiO₂A composite material;

(2) preparing the energy-saving emission-reducing functional coating: sequentially mixing water, propylene glycol, a dispersant, a wetting agent, a defoaming agent, nano La and Ce/TiO₂Composite material and Cr₂O₃Stirring in a mixing tank under 50Mpa, dispersing by homogenizer at 30L/h, sequentially adding acrylic acid emulsion, DPnB film-forming assistant, dibutyl phthalate, and rheology modifierAnd dispersing the sex agent, the thickening agent and the silica sol for 30min at the rotating speed of 800 r/min by using a dispersion machine to obtain the energy-saving emission-reducing functional coating.

Preferably, the volume ratio of the butyl titanate to the absolute ethyl alcohol in the step (1) is 1: 6.

Preferably, the lanthanum nitrate solution in the step (1) is prepared by adding 0.125% lanthanum nitrate into distilled water and fully mixing, and the volume ratio of the distilled water to the concentrated hydrochloric acid is 10: 1.

Preferably, the dropping speed of the solution II into the solution I in the step (1) is 1 d/s.

Preferably, the drying temperature for drying the gel into xerogel in the step (1) is 70 ℃, and the drying time is 12 h.

Preferably, the temperature rising speed of the dry gel placed in the temperature-programmed resistance furnace in the step (1) is 1-3 ℃/min.

Preferably, the water, the propylene glycol, the dispersing agent, the wetting agent, the defoaming agent and the Cr in the step (2)₂O₃The mass ratio of the acrylic emulsion to the DPnB film-forming assistant to the dibutyl phthalate, the rheology modifier to the thickening agent to the silica sol is 100:30:10:5:1:2, and the mass ratio of the acrylic emulsion to the DPnB film-forming assistant to the dibutyl phthalate to the rheology modifier to the thickening agent to the silica sol is 543:40:30:5: 2: 75.

A method for treating a core plate with holes by using energy-saving and emission-reducing functional paint comprises the following steps:

A. preparing a core plate with holes;

B. putting the core plate with the hole into 5% of LS-206 degreasing agent, soaking for 10min, and then washing with water;

C. b, putting the core plate with the holes obtained in the step B into 0.3% of LS-104 titanium salt surface conditioner for soaking for 1-2 min;

D. b, phosphorizing the core plate with the holes obtained in the step C for 10min, and then washing with water;

E. and (3) placing the phosphorized core plate with the holes into the energy-saving emission-reducing functional coating to be soaked for 5min, and then drying at the drying temperature of 90-100 ℃ for 40 min.

Preferably, in the step D, the porous core plate is phosphated by a phosphating solution, the phosphating solution is prepared by dissolving ZnO in water, adding 85% phosphoric acid under stirring to completely dissolve the ZnO, sequentially adding nitric acid, citric acid, nickel nitrate, copper nitrate, chromium alum, an accelerator and manganese dihydrogen phosphate, stirring until completely dissolving, adding water and stirring uniformly to obtain a concentrated solution, diluting the concentrated solution by 20 times, adjusting the free acidity by using NaOH for 2-4 points, and adjusting the total acidity by 30-40 points to obtain the phosphating solution.

Preferably, the mass ratio of the ZnO, the nitric acid, the citric acid and the accelerator is 8:6:2:15, and the mass ratio of the nickel nitrate, the copper nitrate, the chrome alum and the manganese dihydrogen phosphate is 10:1:10: 20.

Therefore, the preparation method of the energy-saving emission-reducing functional coating with the structure and the treatment method of the core plate with the holes have the following technical effects:

(1) the La and Ce/TiO2 nano composite materials are successfully prepared by adopting a sol-gel method, the doping amounts of Ce and La are respectively 0.05 percent and 0.125 percent, the maximum roasting temperature is 550 ℃, and the average particle size of the nano material is 12 nm;

(2) the La and Ce/TiO2 nano powder is added into a water-based paint prepared by taking acrylic emulsion as a main raw material, and the paint is used for coating a metal core plate with holes and then used as an inner core supporting carrier of an air filter, so that the prepared functional filter can save oil by about 3% and reduce emission by about 95%.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 shows that the calcination temperatures of the nano La and Ce/TiO are different₂XRD pattern of the composite.

Detailed Description

The invention provides a preparation method of an energy-saving emission-reducing functional coating and a treatment method of a core plate with holes, which comprises the following steps:

(1) nano La, Ce/TiO₂Preparing a composite material: firstly, dropwise adding butyl titanate into absolute ethyl alcohol under stirring to obtain a solution I, wherein the volume ratio of the butyl titanate to the absolute ethyl alcohol is 1:6, and secondly, adding 0.05 percent of cerium nitrate into the absolute ethyl alcohol with the volume ratio of 30:1And adding 0.125% lanthanum nitrate solution into the mixed solution, fully mixing to obtain a solution II, adding 0.125% lanthanum nitrate into distilled water, fully mixing, wherein the volume ratio of the distilled water to the concentrated hydrochloric acid is 10:1, dropwise adding the solution II into the solution I at a dropwise adding speed of 1d/s, stirring, continuously stirring for 20min after dropwise adding is finished, sealing and aging for 15h at room temperature until the solution is completely converted into gel, drying in a drying box to obtain dried gel, wherein the drying temperature is 70 ℃, the drying time is 12h, finally, controlling the temperature of the dried gel in a temperature programming resistance furnace to 550 ℃, the temperature raising speed is 1-3 ℃/min, roasting for 2h, and grinding by a nano machine to obtain nano La, Ce/TiO and nano Ce/TiO₂A composite material.

(2) Preparing the energy-saving emission-reducing functional coating: sequentially mixing water, propylene glycol, a dispersant, a wetting agent, a defoaming agent, nano La and Ce/TiO₂Composite material and Cr₂O₃Stirring while adding in a mixing tank, dispersing by 50Mpa pressure and 30L/h flow of a homogenizer, then sequentially adding acrylic emulsion, DPnB film-forming assistant, dibutyl phthalate, rheological modifier, thickening agent and silica sol, and dispersing for 30min at 800 r/min by a dispersion machine to obtain the energy-saving emission-reduction functional coating, wherein water, propylene glycol, dispersing agent, wetting agent, defoaming agent and Cr are added₂O₃The mass ratio of the acrylic emulsion to the DPnB film-forming assistant to the dibutyl phthalate, the rheology modifier to the thickening agent to the silica sol is 100:30:10:5:1:2, and the mass ratio of the acrylic emulsion to the DPnB film-forming assistant to the dibutyl phthalate to the rheology modifier to the thickening agent to the silica sol is 543:40:30:5: 2: 75.

A. a core plate with holes is prepared.

B. And (3) putting the core plate with the hole into 5% of LS-206 degreasing agent, soaking for 10min, and then washing with water.

C. And D, putting the core plate with the holes obtained in the step B into 0.3% of LS-104 titanium salt surface conditioner for soaking for 1-2 min.

D. B, phosphorizing the core plate with the holes obtained in the step C for 10min, then washing with water, and preparing the used phosphorizing liquid by dissolving ZnO in water, adding 85% phosphoric acid under stirring to completely dissolve ZnO, sequentially adding nitric acid, citric acid, nickel nitrate, copper nitrate, chromium alum, an accelerant and manganese dihydrogen phosphate, stirring until completely dissolving, adding water and stirring uniformly to obtain a concentrated solution, diluting the concentrated solution by 20 times, adjusting the free acidity by 2-4 points by NaOH, and adjusting the total acidity by 30-40 points, wherein the mass ratio of ZnO, nitric acid, citric acid and the accelerant is 8:6:2:15, and the mass ratio of nickel nitrate, copper nitrate, chromium alum and manganese dihydrogen phosphate is 10:1:10: 20.

Examples

A preparation method of an energy-saving emission-reducing functional coating and a treatment method of a core plate with holes comprise the following steps:

(1) nano La, Ce/TiO₂Preparing a composite material: firstly, dropwise adding 6L of butyl titanate into 36L of absolute ethyl alcohol under stirring to obtain a solution I, secondly, adding 0.05% of cerium nitrate into a mixed solution of 18L of absolute ethyl alcohol and 0.6L of concentrated hydrochloric acid, adding 0.125% of lanthanum nitrate solution into the mixed solution, fully mixing to obtain a solution II, adding 0.125% of lanthanum nitrate into 6L of distilled water, fully mixing, dropwise adding the solution II into the solution I at the dropwise adding speed of 1d/s, stirring, continuing to stir for 20min after the dropwise adding is finished, sealing and aging for 15h at room temperature until the solution is completely converted into gel, putting the gel into a drying box to dry gel, drying at the drying temperature of 70 ℃ for 12h, finally, controlling the programmed temperature of the dry gel in a programmed temperature resistance furnace to 550 ℃, controlling the temperature rising speed to be 1-3 ℃/min, roasting for 2h, grinding by a nanometer machine to obtain nanometer La, Ce/TiO₂A composite material.

(2) Preparing the energy-saving emission-reducing functional coating: 10Kg of water, 3Kg of propylene glycol, 1Kg of dispersing agent, 0.5Kg of wetting agent, 0.1Kg of antifoaming agent, and a proper amount of nano La, Ce/TiO in sequence₂Composite material, 0.2KgCr₂O₃Stirring in a mixing tank while stirring, homogenizingDispersing the acrylic emulsion under the pressure of 50MPa and the flow of 30L/h, then sequentially adding 54.3Kg of acrylic emulsion, 4Kg of DPnB film-forming assistant, 3Kg of dibutyl phthalate, 0.5Kg of rheological modifier, 0.2Kg of thickening agent and 7.5Kg of silica sol, and dispersing for 30min at the rotating speed of 800 r/min by using a dispersion machine to obtain the energy-saving and emission-reducing functional coating.

An X-ray diffractometer is adopted for phase analysis of a sample, XRD patterns of the sample at different maximum roasting temperatures are shown in figure 1, with the rise of the roasting temperature, the crystal form of the sample is changed from anatase type to rutile type, the particle size is gradually increased, the crystal structure generates defects, and the surface activity is improved within a certain range. The Ce and the La-TiO can be damaged when the temperature is too high₂The pore structure of (2) inevitably reduces the surface area, thus influencing the function. Experiments show that: when the highest roasting temperature is about 550 ℃, the anatase/rutile type is about 5:1, the energy-saving and emission-reducing effects are better, and the particle size distribution of a sample is calculated by a Scherre formula Dhkc-0.89 lambda/beta hklCOS theta: 5-12 nm.

A. a core plate with holes is prepared.

D. And C, phosphorizing the core plate with the holes obtained in the step C for 10min, and then washing with water, wherein the used phosphorizing solution is prepared by dissolving 8KgZnO in water, adding 85% phosphoric acid under stirring to completely dissolve ZnO, sequentially adding 6Kg of nitric acid, 2Kg of citric acid, 0.1Kg of nickel nitrate, 0.01Kg of copper nitrate, 0.1Kg of chromium alum, 15Kg of accelerant and 0.2Kg of manganese dihydrogen phosphate, stirring until the chromium alum, the accelerant and the manganese dihydrogen phosphate are completely dissolved, adding water and stirring uniformly to obtain a concentrated solution, diluting the concentrated solution by 20 times, adjusting the free acidity by NaOH to 2-4 points, and adjusting the total acidity to 30-40 points.

The treated core board with holes is tested for the coating performance according to GB/T1771 colored paint and varnish, neutral salt spray resistance measurement, GB/T colored paint and varnish, paint film grid test, GB/T1732 paint film impact resistance measurement method, GB/T1734 paint film gasoline resistance measurement method, GB/T colored paint and varnish water-resistant immersion method and the like, and the test results are shown in Table 1.

Table 1 functional coating performance test results

Item	Test results	Reference standard
			Resistance to salt fog	50h	GB/T1771
Lattice test	Level	0				GB/T9286
			Impact resistance	50Kg.cm	GB/T1732
Gasoline resistance	Qualified	GB/T1734
			Water resistance	Qualified	GB/T5209

The core plate with the holes is used on an automobile filter to form a functional filter, the operation conditions of the same vehicle using the same fuel oil to install a common filter and the functional filter are respectively measured according to the method specified in GB18285-2005, the content of the tail gas pollutants is further calculated, and the test results are shown in Table 2.

Table 2 test results of efficiency of treating automobile exhaust pollutants by functional filter

Exhaust gas pollutants	HC(×10-6)	CO(％)	NOx(×10-6)
				Test results for a common Filter	150.0	0.8	20.0
Functional Filter test results	6.0	0.048	0.6
				Emission reduction efficiency (%)	96	94	97

The same fuel is used in the same automobile, and the automobile combustion system is provided with a flowmeter, so that the automobile is driven to run at a fixed distance. (Beijing pentacyclic 102Km) compare fuel consumption using different filters. Through six tests, the statistical result is as follows: compared with the common filter, the functional filter can save oil by 2-4%.

According to the above analysis, CO and CH in the tail gas are both the result of incomplete combustion of fuel hydrocarbons caused by insufficient oxygen supply, and the large amount of nitrogen in the air is not only the source of NOx in the tail gas consuming part of O₂And due to N₂Has a negative effect on the combustion of the fuel hydrocarbon. Therefore, if the nitrogen in the air is controlled to enter the cylinder combustion chamber, the purposes of energy conservation and emission reduction can be achieved. Nano La, Ce/TiO₂The composite material is loaded on the metal sheet with the holes on the inner core of the air filter, so that the nitrogen can be intercepted, and the oxygen can completely pass through the metal sheet and enter a combustion chamber of the cylinder. The action mechanism is as follows: TiO2₂The gap interval between the full band and the empty band is about 3.2eV between the semiconductor and the insulator, which is close to the semiconductor, after doping the rare earth element, because the rare earth element has f electrons, the multi-electron configuration is easy to generate, and the gap interval can be reduced, so that the semiconductor material is changed into a real semiconductor material. N is a radical of₂Has an electronic configuration of 1 sigma_g ²2σ_u ²2σ_g ²2σ_u ²1π_u ⁴3σ_g ²Due to the small difference (6eV) of the energy levels of the 2s and 2p orbitals of the nitrogen atom and the symmetry matching, the 2s and 2pz orbitals are also effectively combined, and finally the energy levels of the 3 sigma g and 1 pi u orbitals are staggered, quantum chemical calculation and ultraviolet photoelectron spectroscopy research show that the highest occupied orbit 3 sigma g is a weak bonding orbit, and electrons are concentrated at two ends of the N atom. N is a radical of₂Electrons at the molecular terminals can coordinate to the semiconductor vacant band to form weak bonds to be adsorbed on the semiconductor surface. The nano semiconductor material has great specific surface area and high dispersivity, and the surface effect and quantum effect can make N possess₂The adsorption and desorption on the surface are carried out alternately at the moment to play a roleTo N₂The interception function of (1). And O is₂Has an electronic configuration of 1 sigma_g ²1σ_u ²2σ_g ²2σ_u ²3σ_g ²1π_u ⁴1π_g ². Due to the large difference in energy levels between the 2s and 2p orbitals (greater than 10eV), the 2s and 2pz orbitals cannot be effectively combined, and the 3 σ g and 1 π u orbitals are in the normal order without energy level crossing. The highest occupied orbit is 1 pi g, two degenerate anti-bonding pi orbitals are occupied by two one-electron components, and the 3 sigma g orbit has lower energy, so that the coordination condition to the semiconductor vacant band is not met. Whereby O is₂Without being intercepted, and smoothly enters the combustion chamber of the cylinder. Thus, N can be made₂And O₂O separated into combustion chamber₂The ratio is greatly increased, and N₂The proportion is greatly reduced, so that the fuel hydrocarbon is fully combusted, the discharge amount of CO, CH and NOx in tail waste gas is reduced, and the fuel hydrocarbon energy is saved.

Therefore, the preparation method of the energy-saving emission-reducing functional coating with the structure and the treatment method of the core plate with the holes ensure that the indexes of energy conservation and emission reduction of the automobile are not reduced, and meanwhile, the coating is convenient to use, high in efficiency, low in cost, convenient to popularize and wide in prospect.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.

Claims

1. The preparation method of the energy-saving emission-reducing functional coating is characterized by comprising the following steps: (1) nano La, Ce/TiO₂Preparing a composite material: firstly, dropwise adding butyl titanate into absolute ethyl alcohol under stirring to obtain a solution I, wherein the volume ratio of the butyl titanate to the absolute ethyl alcohol is 1:6, and secondly, adding 0.05 percent of cerium nitrate into the absolute ethyl alcohol and concentrated hydrochloric acid with the volume ratio of 30:1Adding 0.125% lanthanum nitrate solution into the mixed solution, adding 0.125% lanthanum nitrate into distilled water, fully mixing, wherein the volume ratio of the distilled water to concentrated hydrochloric acid is 10:1, fully mixing to obtain solution II, dropwise adding the solution II into the solution I again, stirring, continuously stirring for 20min after dropwise adding is finished, sealing and aging for 15h at room temperature until the solution is completely converted into gel, putting the gel into a drying box, drying to obtain dried gel, finally performing programmed temperature rise control on the dried gel in a programmed temperature rise resistance furnace to 550 ℃, roasting for 2h, and grinding by a nano-machine to obtain the nano La, Ce/TiO/nano-grade titanium oxide₂A composite material; (2) preparing the energy-saving emission-reducing functional coating: sequentially mixing water, propylene glycol, a dispersant, a wetting agent, a defoaming agent, nano La and Ce/TiO₂Composite material and Cr₂O₃Stirring while adding in a mixing tank, dispersing by 50Mpa pressure and 30L/h flow of a homogenizer, then sequentially adding acrylic emulsion, DPnB film-forming assistant, dibutyl phthalate, rheological modifier, thickening agent and silica sol, dispersing for 30min at 800 r/min by a dispersion machine to obtain the energy-saving emission-reducing functional coating, and adding water, propylene glycol, dispersing agent, wetting agent, defoaming agent and Cr₂O₃The mass ratio of the acrylic emulsion to the DPnB film-forming assistant to the dibutyl phthalate is 100:30:10:5:1:2, and the mass ratio of the acrylic emulsion to the DPnB film-forming assistant to the dibutyl phthalate to the rheology modifier to the thickening agent to the silica sol is 543:40:30:5: 2: 75, treating the core plate with the holes by using the energy-saving emission-reducing functional coating, wherein the treatment method comprises the following steps: A. preparing a core plate with holes; B. putting the core plate with the hole into 5% of LS-206 degreasing agent, soaking for 10min, and then washing with water; C. b, putting the core plate with the holes obtained in the step B into 0.3% of LS-104 titanium salt surface conditioner for soaking for 1-2 min; D. b, phosphorizing the core plate with the holes obtained in the step C for 10min, and then washing with water; E. and (3) placing the phosphorized core plate with the holes into the energy-saving emission-reducing functional coating to be soaked for 5min, and then drying at the drying temperature of 90-100 ℃ for 40 min.

2. The preparation method of the energy-saving emission-reducing functional coating according to claim 1, characterized in that: the dropping speed of the solution II in the step (1) into the solution I is 1 d/s.

3. The preparation method of the energy-saving emission-reducing functional coating according to claim 2, characterized in that: the drying temperature of the gel dried into xerogel in the step (1) is 70 ℃, and the drying time is 12 h.

4. The preparation method of the energy-saving emission-reducing functional coating according to claim 3, characterized by comprising the following steps: and (2) placing the dry gel in the step (1) in a temperature programming resistance furnace, wherein the temperature rising speed is 1-3 ℃/min.

5. The preparation method of the energy-saving emission-reducing functional coating according to claim 1, characterized in that: and D, phosphorizing the porous core plate by using a phosphorizing liquid, wherein the phosphorizing liquid is prepared by dissolving ZnO in water, adding 85% phosphoric acid under stirring to completely dissolve ZnO, sequentially adding nitric acid, citric acid, nickel nitrate, copper nitrate, chromium alum, an accelerator and manganese dihydrogen phosphate, stirring until completely dissolving, adding water and stirring uniformly to obtain a concentrated solution, diluting the concentrated solution by 20 times, adjusting the free acidity by using NaOH to 2-4 points, and adjusting the total acidity by 30-40 points to obtain the phosphorizing liquid.

6. The preparation method of the energy-saving emission-reducing functional coating according to claim 5, characterized in that: the mass ratio of ZnO, nitric acid, citric acid and the accelerator is 8:6:2:15, and the mass ratio of nickel nitrate, copper nitrate, chromium alum and manganese dihydrogen phosphate is 10:1:10: 20.