CN112552820A

CN112552820A - Reinforcing liquid for opening of film-coated metal plate and preparation method

Info

Publication number: CN112552820A
Application number: CN202011226933.4A
Authority: CN
Inventors: 郭永忠; 杨照军; 金辉; 陈齐超
Original assignee: Anhui Wonderful Wall Color Coating Aluminum Science Technology Co ltd
Current assignee: Anhui Wonderful Wall Color Coating Aluminum Science Technology Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-03-26

Abstract

The invention discloses a film-coated metal plate opening reinforcing liquid and a preparation method thereof, wherein the reinforcing liquid comprises the following components in parts by weight: 9-11 parts of resin; 0.4-0.6 part of PEI modified mesoporous oxide; 3.5-3.9 parts of composite emulsion; 1.9-2.1 parts of water; 0.02-0.05 part of dispersion stabilizer; 0.02-0.05 part of pigment and filler; 0.3-0.5 part of anticorrosive filler; firstly, adding a dispersing agent and other auxiliaries into a premixing tank, uniformly stirring, then adding a filler, and adding powder into a vortex; stirring, adding all the powder, wetting, grinding, dispersing, filtering, and packaging to obtain the final product; the invention can well perform fluid infusion on the opening of the film-coated metal plate, has stronger corrosion resistance and salt spray resistance, better leveling property and glossiness, stronger adhesive force, environmental protection and strong impact resistance.

Description

Reinforcing liquid for opening of film-coated metal plate and preparation method

Technical Field

The invention relates to the technical field of metal plate processing, in particular to a film-coated metal plate opening reinforcing liquid and a preparation method thereof.

Background

The laminated metal plate is a processing technology for sticking a plastic film to a metal plate by hot pressing the plastic film and the metal plate at high temperature, the plastic film is generally a high polymer film and widely applied to various fields such as building material internal and external decoration, household appliances, automobiles and the like, because the processing does not use adhesives or solvents and does not contain formaldehyde, the plastic film is widely accepted in the market, and the plastic film is subjected to treatment such as beautifying decoration, antibiosis, dye prevention and the like, so that the health of people is ensured.

Disclosure of Invention

The invention aims to provide a film-coated metal plate opening reinforcing liquid and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention is realized by the following technical means:

a reinforcing liquid for an opening of a film-coated metal plate comprises the following components in parts by weight:

9-11 parts of resin;

0.4-0.6 part of PEI modified mesoporous oxide;

3.5-3.9 parts of composite emulsion;

1.9-2.1 parts of water;

0.02-0.05 part of dispersion stabilizer;

0.02-0.05 part of pigment and filler;

0.3-0.5 part of anticorrosive filler.

Further, as a preferred embodiment of the present invention, the reinforcing liquid for the opening of the film-coated metal plate comprises the following components in parts by weight:

10 parts of resin;

0.5 part of PEI modified mesoporous oxide;

3.78 parts of composite emulsion;

2.01 parts of water;

0.04 part of dispersion stabilizer;

0.04 part of pigment and filler;

0.4 part of anticorrosive filler.

Further, in a preferred embodiment of the present invention, the PEI-modified mesoporous oxide is polyethyleneimine-modified mesoporous titania.

Further, as a preferred embodiment of the present invention, wherein the composite emulsion comprises the following components in parts by weight:

12-15 parts of composite dispersion stabilizer

170 portions of composite antiseptic medium and 200 portions of composite antiseptic medium;

90-110 parts of talcum powder;

18-22 parts of body filler;

110 portions and 130 portions of 5 percent nanometer suspension stabilizer;

5-7 parts of 5% macromolecular thickening agent;

10% OP-10, 4-6 parts.

13.8 parts of composite dispersion stabilizer

186 parts of composite anticorrosive medium;

100 parts of talcum powder;

20 parts of body filler;

120 portions of 5 percent nanometer suspension stabilizer;

5% macromolecular thickening agent, 6 parts;

10% OP-10, 5 parts.

A preparation method of a reinforcing liquid for an opening of a film-coated metal plate comprises the following steps: the method comprises the following steps:

(1) firstly, adding a dispersing agent and other auxiliaries into a premixing tank, uniformly stirring, and then adding a filler;

(2) the filling material which is difficult to disperse is firstly added, and then the filling material which is easy to disperse is added; firstly, filling the filler with low density, high water absorption and fine particle size; feeding and stirring the corresponding materials in sequence;

(3) feeding the materials under stirring, and adding the powder materials to a vortex; the feeding speed is consistent with the mixing condition of the slurry, after each bag of pigment powder is added, powder adhered to the wall of the tank and the stirring shaft is scraped into the slurry, stirred evenly and then fed into the next bag; after all the powder is put into the tank, process water is applied to thoroughly clean the inner wall of the tank; continuously stirring for a period of time, well mixing the mixture, fully wetting the filler, and grinding and dispersing the mixture to obtain a corresponding material; then filtering and packaging to obtain the finished product.

Compared with the prior art, the invention has the following beneficial effects:

the invention can well perform fluid infusion on the opening of the film-coated metal plate, has stronger corrosion resistance and salt spray resistance, better leveling property and glossiness, stronger adhesive force, environmental protection and strong impact resistance.

Description of the drawings:

FIG. 1 is a graph of Nernst with a pure resin coating soaked in 3.5% NaCl solution for 1h, 24h and 48h, respectively;

FIG. 2 is a Nernst diagram of pure resin coating +0.2g nano-oxide soaked in 3.5% NaCl solution for 1h, 24h and 48h, respectively;

FIG. 3 is a Nernst diagram of pure resin coating +0.2g of mesoporous oxide soaked in 3.5% NaCl solution for 1h, 24h and 48h, respectively;

FIG. 4 is a Nernst chart of pure resin coating +0.2g mesoporous oxide/PEI soaked in 3.5% NaCl solution for 1h, 24h and 48h, respectively;

FIG. 5 is a plot of the AC impedance of four coatings after fitting by the Zview software;

fig. 6 is a simulation diagram of the corrosion prevention mechanism of the nano reinforced resin coating.

The specific implementation mode is as follows:

in order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is further described below with reference to the following examples:

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The invention relates to a method for preparing a composite material, which comprises the following steps: see the drawings.

In this embodiment, a reinforcing liquid for an opening of a film-coated metal plate comprises the following components in parts by weight:

9-11 parts of resin;

0.4-0.6 part of PEI modified mesoporous oxide;

3.5-3.9 parts of composite emulsion;

1.9-2.1 parts of water;

0.02-0.05 part of dispersion stabilizer;

0.02-0.05 part of pigment and filler;

0.3-0.5 part of anticorrosive filler.

10 parts of resin;

0.5 part of PEI modified mesoporous oxide;

3.78 parts of composite emulsion;

2.01 parts of water;

0.04 part of dispersion stabilizer;

0.04 part of pigment and filler;

0.4 part of anticorrosive filler.

12-15 parts of composite dispersion stabilizer

90-110 parts of talcum powder;

18-22 parts of body filler;

110 portions and 130 portions of 5 percent nanometer suspension stabilizer;

5-7 parts of 5% macromolecular thickening agent;

10% OP-10, 4-6 parts.

13.8 parts of composite dispersion stabilizer

186 parts of composite anticorrosive medium;

100 parts of talcum powder;

20 parts of body filler;

120 portions of 5 percent nanometer suspension stabilizer;

5% macromolecular thickening agent, 6 parts;

10% OP-10, 5 parts.

In an experiment for researching the influence of different coating reinforcing particles on the corrosion resistance of a water-based resin coating, four groups of experiments are designed, wherein 0.2g of nano oxide, 0.2g of mesoporous oxide and 0.2g of PEI modified mesoporous oxide are respectively added on the basis of 10g of resin and 17g of total coating. Then placing the coating in a planetary ball mill, setting relevant parameters, grinding for 5h, taking out the coating, preparing the coating by adopting a brush coating method according to GB/T1727-1992 general preparation method of the coating, respectively coating the coating on tinplate with the specification of 50 multiplied by 120 multiplied by 0.3mm by a 50-micron coating device, and drying at normal temperature for 48h to obtain a uniform wet film with the thickness of about 200 mu m, wherein 4 groups of coatings A-1, A-2, A-3 and A-4; the influence of the content of the PEI modified mesoporous oxide on the corrosion resistance of the coating is researched, and the amounts of the PEI modified mesoporous oxide added into the basic formula are respectively 0g, 0.5g, 1.0g, 1.5g, 2.0g and 2.5 g. The prepared emulsion was fully ground in a planetary ball mill, coated on a tinplate of 50X 120X 0.3mm with a 50 μm coater, and dried at room temperature for 8 hours to obtain 6 groups of coatings B-1, B-2, B-3, B-4, B-5 and B-6.

The alternating current impedance performance of the coating is mainly measured by an electrochemical alternating current impedance technology, the selected instrument is CHI600E series electrochemical workstation of Shanghai Chenghua instruments Co., Ltd, and a three-electrode system is adopted to test the alternating current impedance performance of the coating. The three electrodes are respectively a working electrode, an auxiliary electrode platinum electrode and a reference electrode calomel electrode, and after the device is connected, the device waits for 20min before each AC impedance test is carried out so as to prevent the scattering condition in the test process. The electrolyte for testing is 3.5% NaCl solution, and the frequency scanning range is 0.01Hz-100KHz during the testing process. The initial potential setting is dependent on the open circuit voltage measurement.

In order to influence the depolymerized ethyleneimine modified mesoporous titanium dioxide on the performance of the waterborne resin anticorrosive coating, four groups of experiments are designed, and the performance of the prepared coating is tested by adopting an alternating current impedance technology (EIS). The formulations corresponding to the four groups of experiments were pure resin coating, pure resin coating +0.2g nano-oxide, pure resin coating +0.2g mesoporous oxide and pure resin coating +0.2g PEI modified mesoporous oxide, respectively. The ac impedance test results are shown in fig. 1, 2, 3 and 4. It can be seen from the figure that the nernst diagram corresponding to each of the four experiments has only one capacitive reactance arc, the impedance value of the coating can be roughly seen from the figure to change along with the change of the soaking time, and the longitudinal comparison can also show that the resistance of the coating in the group is larger.

From fig. 1, it can be seen that the arc radius of capacitive reactance of the pure resin coating is significantly reduced along with the increase of the soaking time, and the arc radius of capacitive reactance corresponding to 48h of soaking is continuously reduced on the basis of 24h of soaking, but the amplitude is smaller.

It can be qualitatively seen from fig. 2 that as the soaking time increases, the capacitive reactance arc radius of the coating layer is significantly reduced, that is, the resistance value of the coating layer decreases rapidly, and after soaking for 24h, the capacitive reactance arc radius of the coating layer still decreases, but the amplitude is smaller, and the corresponding resistance value of the coating layer decreases slowly.

As can be seen from FIG. 3, the arc-tolerant radius of the coating does not decrease significantly with the increase of the soaking time, but the initial radius is smaller and much smaller than that of other coatings, presumably because the mesoporous oxide is not well dispersed in the coating, the resulting coating is not flat and smooth, and some white particles are precipitated on the surface of the coating.

As can be seen from FIG. 4, the initial capacitive arc radius of the coating was significantly larger than that of the other coatings, and after 24h soaking in 3.5% NaCl saline, the capacitive arc radius of the coating decreased, but the amplitude was smaller relative to the other coatings, and after 48h soaking, the capacitive arc radius of the coating continued to decrease, but remained larger for the other coatings.

In order to obtain more exact parameters for evaluating the protective properties of the coating: coating capacitance (Rc), coating resistance (Rc), polarization resistance (Rp), etc., require the selection of appropriate physical models and equivalent circuit diagrams to fit the measured ac impedance data. In the experiment, Zview software is adopted to fit measured data, an impedance diagram obtained by the fitting of the Zview software is shown in figure 5, and corresponding electrochemical parameters obtained are shown in tables 1-4

TABLE 1A-1 electrochemical values of plate coating

TABLE 2A-2 electrochemical values of plate coating

TABLE 3A-3 electrochemical values of plate coating

TABLE 4A-4 electrochemical values of plate coating

Tables 1-4 show the relevant electrochemical parameters for the plate coatings A-1, A-2, A-3 and A-4, respectively, and the resulting electrochemical parameters are solution resistance Rs, coating capacitance Cc and coating resistance Rc. The solution resistance represents the resistance between the working electrode and the reference electrode, and has many factors, which are related to the concentration of the electrolyte, the distance between the working electrode and the reference electrode, the experimental temperature, and possibly the open circuit voltage. It can be seen from tables 1 to 4 that the solution resistance of the coating layer did not change significantly, indicating that the relevant influencing factors did not affect it much, while in Table 4, the solution resistance of the A-4 plate soaked for 1h and 48h coating layer was 11.82 Ω. cm²And 11.61. omega. cm²And the resistance of the solution obtained by soaking for 24 hours is 20.84 omega cm²Significantly greater solution resistance than soaking for 1h and 24h, which may be related to the position of the electrodes and the height of the electrolyte at the time of the experiment. The value of the coating capacitance Cc is related to the water absorption of the coating, the influence factors are more, and the position and the parallelism of the conducting wire during measurement can influence the result. In addition, the arrangement position, the inclination degree and the operation in the picking-up detection process of the tinplate in the beaker filled with 3.5 percent NaCl solution can influence the result. The most effective coating corrosion protection is the coating resistance Rc, which was individually selected for each plate and shown in Table 5 for ease of observation and analysis

TABLE 5 rule of coating resistance Rc of different sample plates according to soaking time

As can be seen from the comparative data in Table 5, the resistance of the A-4 plate coating is obviously higher than that of other plates, and the resistance value of the A-4 plate coating can reach 807.7 omega cm after being soaked for 1h²Higher than 732.4 omega cm of pure resin coating²And the coating resistances of the A-2 and A-3 plates are 559.2 omega cm respectively²And 276.4. omega. cm²And the resistance value is far smaller than that of the pure resin coating, which shows that the addition of the nano oxide not only does not increase the protective performance of the pure resin coating, but also deteriorates the protective performance of the coating. Viewed from the longitudinal direction, the resistance value of the A-1 plate coating is reduced by 522.2 omega cm after soaking for 24 hours²The reduction amplitude is 71.3%; the resistance value of the A-2 plate coating is reduced by 288 omega cm²The reduction amplitude is 51.5%; the resistance value of the A-3 plate coating is not obviously changed, and the resistance value of the A-4 plate coating is reduced by 269.3 omega cm²The reduction amplitude is 33.3%; after soaking for 48h, the resistance value of the A-1 plate coating is reduced by 545.7 omega cm²The decrease was 74.5%, and the resistance of the A-2 plate coating was decreased by 352.4. omega. cm²The reduction amplitude is 63.0%; the resistance value of the A-3 plate coating is reduced by 24.4 omega cm²The reduction amplitude is 8.8%; the resistance value of the A-4 plate coating is reduced by 349 omega cm²The reduction was 43.2%. From the above analysis, it can be seen that the pure resin coating layer is immersed in 3.5% NaCl solution for 24h and 48h, and the decrease of the coating resistance is 71.3% and 74.5%, respectively, while the pure resin coating layer, to which 1.5g of PEI-modified mesoporous oxide is added, is immersed in 3.5% NaCl solution for 24h and 48h, and the decrease of the coating resistance is 33.3% and 43.2%, respectively. The PEI modified mesoporous oxide can enhance the salt water resistance of the coating and reduce the erosion speed of salt water. In conclusion, the protective performance of the coating can be obviously improved by adding the polyethyleneimine modified mesoporous oxide.

On the basis, the influence of the addition amount of the PEI modified mesoporous oxide on the anticorrosion performance of the coating is analyzed.

TABLE 6 rule of coating resistance Rc of six different sample plates with soaking time

As shown in table 6, since the electrochemical test was directly performed without soaking, scattering occurred, and the initial corrosion prevention performance of the coating was replaced by the resistance of the coating obtained by soaking for 1 hour. Transverse comparison As can be seen from the above table, the initial coating resistance of the B-4 plate is at a maximum, reaching 1887. omega. cm²1546 Ω · cm of B-5 plate with the second largest resistance of the coating²Far greater than the resistance value of 732.4 omega cm of pure resin coating². After soaking for 24h, the coating still has the largest resistance of the B-4 plate, and the resistance of the coating is 1121 omega cm²A B-3 plate with resistance value of 981.1 omega cm larger than the second largest coating resistor². Far greater than 214.2 omega cm of pure resin coating². After being soaked in the solution for 48 hours, the resistance value of the B-4 plate coating is 772.9 omega cm²Slightly smaller than 786.1 omega cm of B-2 plate². Transverse comparison shows that the optimal addition amount of the mesoporous oxide is the addition amount corresponding to the B-4 plate, and the addition amount is 1.5 g. And longitudinally comparing, wherein after soaking for 24h, the reduction rates of the resistance values of the coatings from the B-1 plate to the B-6 plate are respectively as follows: 70.8%, 12.6%, 7.2%, 40.5%, 39% and 37.4%. The reduction rate of the resistance value of the coating from the B-1 plate to the B-6 plate after soaking for 48 hours is respectively as follows: 74.5%, 35.4%, 29.2%, 59.0%, 56.6% and 39.3%. From the reduction rate of the resistance value of the coating obtained by longitudinal comparison, the coating corresponding to the optimal addition amount of the mesoporous oxide is a B-2 plate, the addition amount of the mesoporous oxide corresponding to the coating is 0.5g, and the corresponding content is 2.9%.

FIG. 6 is a simulated corrosion mechanism diagram of two different coatings, (a), (b) are respectively a pure resin coating and a nano reinforced resin coating, as shown in (a) of FIG. 6, the pure resin coating has extremely small holes, water, chloride ions and hydroxide ions in the air can pass through the extremely small holes in the coatings to reach the metal surface, and Cl^-And H₂The arrival of O on the metal surface will generate HCl and HClO^-The acid can corrode the metal. In addition if H₂O and O₂Molecules reach the surface of the metal and can be subjected to oxygen absorption electrochemical corrosion with the metal. And the nano functional material is added into the pure resin coating, so that the path of ions or molecules of the corrosion metal to reach the metal surface can be prolongedAs shown in FIG. 1 (b), when the nano-functional particles are added to the aqueous resin, there are no pores in the coating layer which directly reach the metal surface, and OH is present^-、Cl^-、O₂And H₂When the O plasma or molecule wants to pass through the coating from the outside to the metal surface, the O plasma or molecule is hindered by the nano functional particle material, or changes the motion path of the O plasma or molecule, or passes through the nano particles, so that the motion path of the corrosion particles is prolonged, and the motion path of the corrosion particles is greatly prolonged due to the accumulation effect because of a large amount of nano dispersoids contained in the coating. Thus, the addition of the nano-functional material to the pure resin coating can improve the corrosion resistance of the coating.

According to the technical scheme disclosed by the invention, the composite emulsion comprises the following components: 0.138g of composite dispersion stabilizer, 1.86g of composite anticorrosion medium, 1.0g of talcum powder, 0.2g of extender filler, 1.2g of 5% nano suspension stabilizer, 0.06g of 5% macromolecular thickener and 10% OP-100.05 g. In the preparation process of the anticorrosive paint, the problem to be solved is the proportion of water and the composite emulsion. In order to investigate the influence of the ratio of the composite emulsion to water on the coating performance, the influence of the film thickness was controlled, and the coating film was dried at room temperature. The results are shown in Table 7.

TABLE 7 Effect of the ratio of Complex emulsion to Water on coating-related Properties

When the mass of the composite emulsion is smaller than that of water and is less than 13:8, the appearance of the coating material is thinner visually, and the dosage of the thickening agent needs to be increased correspondingly to maintain the consistency of the coating material. The paint is coated on a tinplate by a coating device and dried at room temperature, the surface drying time is about 20min, the actual drying time is less than 1h, the obtained coating has a smooth surface and no shrinkage sagging phenomenon, but the surface is rough because the volume concentration (PVC) of the pigment and filler is large, the amount of the emulsion is small, the pigment and filler cannot be completely coated in the emulsion, the phenomenon that the surface of the coating is rough is caused, the amount of the thickening agent needs to be reduced properly to maintain the viscosity of the paint along with the increase of the mass ratio of the composite emulsion to the water mass, when the mass ratio is large and is more than 23:8, the prepared coating is dry under the same condition, the actual drying time is not obviously changed, the appearance gloss of the coating is good, but is not full, the leveling property is poor, the adhesive force is reduced to 6 level because the adhesive force of the composite emulsion is poor, and the volume concentration of the pigment and filler is correspondingly gradually, the pigment and filler can be completely coated in the emulsion, so that the glossiness of a coating film is better, but the adhesive force is poor, in addition, the appropriate pigment and filler volume concentration can greatly improve the leveling property of the coating, so that the leveling property of the coating is poor when the pigment and filler volume concentration is passively reduced to be below a critical value along with the increase of the content of the composite emulsion. When the ratio of the mass of the composite emulsion to the mass of water is 13/8-2, the experimental result shows that the coating has good appearance leveling property and glossiness and the salt spray resistance is greatly improved although the adhesive force of the coating is slightly reduced. The mass ratio of the composite emulsion to the water is selected to be 15:8 in a comprehensive consideration.

The effect of dispersion stabilizer content on coating performance was explored.

Table 8 explores the effect of dispersion stabilizer content on coating performance

When the amount of the dispersion stabilizer is less than 0.05g, the coating is light yellow emulsion, but the subjective feeling shows that when the amount of the dispersion stabilizer is 0.04-0.05g, the appearance of the coating is fuller and more exquisite, and the anticorrosive performance of the coating is combined, when the amount of the dispersion stabilizer is less than 0.01g, the salt spray resistance of the coating is 60 hours, which is relatively poor, when the amount of the dispersion stabilizer is more than 0.05, the skinning phenomenon begins to appear on the surface of the coating, then the skinning phenomenon is more serious along with the increase of the content of the anticorrosive filler, and the salt spray resistance of the coating prepared by coating through a coater is also reduced to 48 hours. From the above results, it can be obtained by combining literature examination that the dispersion stabilizer promotes the improvement of the anticorrosive property, and the dispersion stabilizer is added in the anticorrosive paint in a proper amount, which is beneficial to the dispersion of the pigment and filler in the paint and improves the dispersion stability of the pigment and filler. Therefore, the stability of the coating is improved, but when the addition amount of the pigment and the filler exceeds 0.05g, the stability of the coating is not improved but becomes worse, the surface of the coating has a skinning phenomenon, and the corresponding salt spray resistance is also greatly reduced. The appearance of the coating and the salt spray resistance of the coating are integrated, and the addition amount of the dispersion stabilizer is 0.04 g.

The influence of the content of the anticorrosive filler on the performance of the coating is explored.

Table 9 explores the effect of anticorrosive filler content on coating performance

Under the condition of controlling the content of other components to be unchanged, the influence of the amount of the anticorrosive filler on the performance of the anticorrosive coating is researched, and the result shows that the content of the anticorrosive filler has more important influence on the salt spray resistance of the anticorrosive coating, and the salt spray resistance of the upper surface coating can be shown, when the content of the anticorrosive filler is less than 0.15g, the salt spray resistance of the coating is 24h, the salt spray resistance of the coating reaches 48h when the amount of the anti-corrosive filler reaches 0.2g, the salt spray resistance of the coating reaches 72h when the amount of the anti-corrosive filler reaches 0.3g, and then the salt spray resistance of the coating does not increase as the amount of the anti-corrosive filler increases to 0.5g, as the amount of the anticorrosive filler is continuously increased, the large volume concentration of the pigment and the filler, the appearance performance of the paint and the anticorrosive performance of the coating are integrated, and the content of the anticorrosive filler in the paint is 0.40 g.

And (5) carrying out adhesion test, water resistance test and acid and alkali resistance test on the coating.

The thickness of the coating can directly affect the corrosion protection of a coating, and generally, the thicker the coating, the better the corrosion protection of the coating is found, because the thicker the coating, the longer the time the water and corrosive medium contact with the surface metal substrate, so as to play a role of protection. For the accurate reliability of the experiment, the same thickness is needed to be adopted for the coating, the thickness is measured by a coating thickness gauge, 5 points are arbitrarily selected on the coating accurately according to the ISO2808-743 method, and the measured thickness is averaged.

The test method for the coating adhesion of the water-based anticorrosive paint refers to GB/T1720-1979.

The coating surface of a sample plate to be tested is fixed on a workbench of a QFD type electric paint film adhesion tester in an upward mode, a pressing plate is used for pressing, an alligator clip is used for tightly clamping an embedded piece, then a circuit is connected, and a movable half-open nut is lifted by a hand and moved to the outer end. Then the power switch is closed and weights are added to the machine tray, after which the half-open nut is lowered. The test adhesion of the coating was judged from the round-rolling line pattern and recorded. The adhesion rating was judged according to the standard GB/T9286-1998[93], and is given in Table 10.

TABLE 10 Standard representation of coating adhesion ratings

The coating Water resistance test was according to standard ASTM D2247-92.

The salt fog resistance of the coating is tested according to the national standard GB/T1731-93.

The coated panels were edge sealed and immersed in a salt spray corrosion tank and the appearance of the coating was observed every 24 hours and recorded. Table 11 shows the evaluation criteria of the corrosion rating of the coating surface.

TABLE 11 evaluation criteria for corrosion rating of coating surface

Evaluation criteria for coating appearance rating are shown in Table 12

TABLE 12 evaluation criteria for coating appearance rating

The impact resistance test of the coating is referred to the national standard GB/T10125-1997.

And horizontally placing the tinplate sample plate with the coating under the drop hammer of the QCJ paint film impactor, and adjusting the height of the drop hammer to perform an impact resistance experiment. The same template was chosen for the interior of the depression and for the damaged edge surface, and the drop weight height was recorded. The degree of damage to the panel from drop weight was recorded as specified in GB/T1731-93. A1 Kg drop weight is conventionally used, the height being 50 cm.

The coating is resistant to chemical testing.

Cotton balls dipped with 5% hydrochloric acid, 5% sodium hydroxide and 5% sodium chloride were placed on the surface of the coating layer to be subjected to coating property detection, respectively. After 24h, the cotton ball is removed, and the paint film is observed to have the phenomena of light loss, color change, bubbling, spots, falling off and the like. If not, the product is qualified, and if the phenomenon occurs, the product is unqualified.

TABLE 13 Main test Properties of aqueous anticorrosion coatings

Through the performance analysis, researchers of the invention think that the anticorrosive material meets the requirement of end face corrosion prevention of the PVDF film-coated steel plate, and the aqueous dispersion is adopted, so that the anticorrosive material has the remarkable advantage of environmental friendliness, can be used for pilot plant and large-scale production, can well perform liquid supplementation on the opening of the film-coated metal plate, has strong corrosion resistance and salt spray resistance, has good leveling property, glossiness and strong adhesive force, and is environment-friendly and strong in impact resistance.

The embodiments disclosed in the present invention are within the scope of the claims, and the specific embodiments are only for describing the specific embodiments of the present invention, and the scope of the present invention is not limited to the specific embodiments, and the specific embodiments should not be construed as limiting the scope of the claims.

In addition, the present invention does not disclose relevant components in the specification and the drawings, which do not hinder the understanding of the present invention by those skilled in the art, and does not disclose other conventional components of the present invention, which do not hinder the understanding of the present invention by those skilled in the art.

The product structure connection relation falling within the protection scope of the invention falls within the protection content of the invention; it is within the spirit of the present invention that conventional technical modifications to the structure of product parts, such as those made in the specific embodiments of the present invention, may be made without departing from the spirit of the present invention.

While certain exemplary embodiments of the invention have been described above by way of illustration only, it will be apparent to those skilled in the art that the described embodiments may be modified in various different ways without departing from the scope of the invention. Accordingly, the foregoing description is illustrative in nature and is not to be construed as limiting the scope of the invention as claimed.

Unless defined otherwise, all academic and scientific terms used herein have the same meaning as is understood by one of ordinary skill in the art to which this invention belongs.

In case of conflict, the present specification, including definitions, will control.

All percentages, parts, ratios, etc., are by weight unless otherwise indicated.

When a value or range of values, preferred range or list of lower preferable values and upper preferable values is given, it should be understood that it specifically discloses any range formed by any pair of values of any lower range limit or preferred value and any upper range limit or preferred value, regardless of whether ranges are separately disclosed. Where a range of numerical values is described herein, unless otherwise stated, the range is intended to include the endpoints of the range and all integers and fractions within the range.

When the term "about" or "approximately" is used to describe a numerical value or an end of a range, the disclosure should be interpreted to include the specific numerical value or end points referred to.

The use of "a" and "an" are merely for convenience and to provide a general context for the invention. Unless expressly stated otherwise, this description should be read to include one or at least one.

Claims

1. The utility model provides a tectorial membrane metal sheet opening part reinforcing liquid which characterized in that: the paint comprises the following components in parts by weight:

9-11 parts of resin;

0.4-0.6 part of PEI modified mesoporous oxide;

3.5-3.9 parts of composite emulsion;

1.9-2.1 parts of water;

0.02-0.05 part of dispersion stabilizer;

0.02-0.05 part of pigment and filler;

0.3-0.5 part of anticorrosive filler.

2. The film-coated metal plate opening reinforcing liquid as claimed in claim 1, wherein: the paint comprises the following components in parts by weight:

10 parts of resin;

0.5 part of PEI modified mesoporous oxide;

3.78 parts of composite emulsion;

2.01 parts of water;

0.04 part of dispersion stabilizer;

0.04 part of pigment and filler;

0.4 part of anticorrosive filler.

3. The film-coated metal plate opening reinforcing liquid as claimed in claim 1, wherein: the PEI modified mesoporous oxide is polyethyleneimine modified mesoporous titanium dioxide.

4. The film-coated metal plate opening reinforcing liquid as claimed in claim 1, wherein: the composite emulsion comprises the following components in parts by weight:

12-15 parts of composite dispersion stabilizer

90-110 parts of talcum powder;

18-22 parts of body filler;

110 portions and 130 portions of 5 percent nanometer suspension stabilizer;

5-7 parts of 5% macromolecular thickening agent;

10% OP-10, 4-6 parts.

5. The film-coated metal plate opening reinforcing liquid as claimed in claim 4, wherein: the composite emulsion comprises the following components in parts by weight:

13.8 parts of composite dispersion stabilizer

186 parts of composite anticorrosive medium;

100 parts of talcum powder;

20 parts of body filler;

120 portions of 5 percent nanometer suspension stabilizer;

5% macromolecular thickening agent, 6 parts;

10% OP-10, 5 parts.

6. A preparation method of a reinforcing liquid for an opening of a film-coated metal plate comprises the following steps: the method is characterized in that: the method comprises the following steps: