Paint set

Abstract

We provide a paint set that can form a protective film for corrosion prevention. [Solution] The solution comprises a first agent and a second agent, which are packaged separately. The first agent is acidic and, with a total amount of the first agent being 100 wt%, comprises 25 wt% to 40 wt% of an alkoxysilane composition and the remainder of a first solvent containing water and alcohol. With a total amount of the alkoxysilane composition being 100 wt%, the alkoxysilane composition contains at least 10 wt% of dialkoxysilane. The second agent is alkaline and, with a total amount of the second agent being 100 wt%, contains 5 wt% or less of water and 20 wt% to 50 wt% of aminoalkylalkoxysilane and the remainder of a second solvent containing alcohol. The amount of the first agent used is 0.4 to 2 times the amount of the second agent used, and the alkoxysilane composition does not contain aminoalkylalkoxysilane.

Description

Technical Field

[0001] The present invention relates to related technologies of wind power generation, and particularly to a paint set for preventing or delaying the corrosion of wind turbines.

Background Art

[0002] Green power generation is becoming an important power generation method worldwide, and one of them is wind power generation. When the machinery of wind power generation is installed on the coast, it is blown by sea winds with high humidity and high salinity for a long time. Without anti-corrosion treatment, its service life will be shortened.

[0003] Conventional anti-corrosion technologies involve applying a paint that can impart anti-corrosion properties to the wind turbine. Such paints include, for example, the paints disclosed in Patent Document 1 and polyalkoxysilane (also referred to as "polysiloxane").

[0004] The drawback of conventional polyalkoxysilane-based anti-corrosion paints is that after being applied to form a coating layer, the time required for the coating layer to dry and form a protective film is long, usually about 12 to 24 hours. However, the weather at sea is changeable, and the longer the time required for dry film formation, the lower the processing success rate. Therefore, further improvement is needed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In view of the above, the object of the present invention is to provide a paint set that can alleviate at least one drawback of the prior art.

Means for Solving the Problems

[0007] The present invention comprises a first agent and a second agent. The first agent is acidic and comprises an alkoxysilane composition in an amount of 25 wt% to 40 wt% of the total amount of the first agent, and the remainder of the first solvent. With a total amount of the alkoxysilane composition being 100 wt%, the alkoxysilane composition contains a content of 10 wt% or more of dialkoxysilane. The first solvent comprises water and alcohol. The second agent is alkaline, and with a total amount of the second agent of 100 wt%, it contains 5 wt% or less of water, and comprises 20 wt% to 50 wt% of aminoalkylalkoxysilane and the remainder of the second solvent. The second solvent contains alcohol, The first agent and the second agent are packaged separately. Based on the amount of the second agent used, the amount of the first agent used is 0.4 to 2 times the amount of the second agent used. The present invention provides a paint set characterized in that the alkoxysilane composition does not contain aminoalkylalkoxysilane. [Effects of the Invention]

[0008] The effect of the paint set of the present invention is that the drying time required to form a protective film is effectively shortened by the action of the first and second agents.

[0009] Specifically, the coating layer obtained by mixing the first and second agents and then applying it can be dried and formed in just about 3 hours in a drying film formation experiment at around 50°C. This significantly increases the success rate of corrosion protection coating work, and the formed protective film can be evaluated satisfactorily in adhesion strength and solvent resistance measurements. [Brief explanation of the drawing]

[0010] [Figure 1]This photograph shows the results of a salt spray test conducted using Example 1 of the paint set of the present invention. [Modes for carrying out the invention]

[0011] In this description of the present invention, terms such as "first," "second," etc., are used solely for the purpose of distinction and do not imply or suggest relative importance.

[0012] The present invention will be described in detail below.

[0013] The paint set of the present invention comprises a first agent and a second agent, which are packaged separately.

[0014] After mixing the first agent and the second agent in a certain ratio to obtain a paint, a coating layer is formed by applying the paint to the object to be coated. Compared to conventional paints, this coating layer can dry in a shorter time and form a protective film with corrosion-resistant properties.

[0015] <First Agent> The first agent is acidic and comprises an alkoxysilane composition and a first solvent for hydrolysis of the alkoxysilane composition.

[0016] In some embodiments, the first agent may further include a pH adjuster for making the first agent acidic, and an oxide for further improving the wear resistance and scratch resistance of the protective film formed.

[0017] The above-mentioned acidity has a pH value of less than 7, and in some embodiments, a pH value of less than 4, such as 1, 1.5, 2, 2.5, 2.8, 3, 3.2, 3.5, etc. In some embodiments, the acidity has a pH value of 3.

[0018] <Alkoxysilane composition> The alkoxysilane composition is a main component for film formation. The alkoxysilane composition is a monomer for polymerizing polyalkoxysilane.

[0019] Taking the total amount of the first agent as 100 wt%, the first agent contains an alkoxysilane composition with a content of 25 wt% - 40 wt%.

[0020] For example, the first agent can contain an alkoxysilane composition with a content of 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34 wt%, 35 wt%, 36 wt%, 37 wt%, 38 wt%, 39 wt%.

[0021] When the content of the alkoxysilane composition is lower than 25 wt%, film formation cannot be achieved after mixing the first agent and the second agent. When the content of the alkoxysilane composition is higher than 40 wt%, the content of the first solvent becomes too low, so the degree of hydrolysis becomes insufficient.

[0022] In some embodiments, the alkoxysilane composition includes dialkoxysilane, trialkoxysilane, and tetraalkoxysilane. The properties of the protective film can be adjusted by alkoxysilanes with different numbers of alkoxy groups.

[0023] Also, since the alkoxysilane composition needs to have the property of being able to perform chain extension or cross-linking between chains, that is, it needs to have the property of being able to polymerize, the main components of the alkoxysilane composition are dialkoxysilane, trialkoxysilane, and tetraalkoxysilane. That is, preferably, the alkoxysilane composition does not contain monoalkoxysilane.

[0024] Dialkoxysilanes can be used to improve the toughness and ductility of protective films. Trialkoxysilanes can improve the permeation resistance of protective films. Tetraalkoxysilanes can improve the density of the protective film structure.

[0025] In order to ensure that the protective film possesses properties such as toughness, ductility, permeability resistance, adhesive strength (adhesion), and structural density, the alkoxysilane composition, with a total amount of 100 wt%, comprises 10 wt% to 35 wt% of dialkoxysilane, 40 wt% to 80 wt% of trialkoxysilane, and 10 wt% to 30 wt% of tetraalkoxysilane.

[0026] <Dialkoxysilane> With the total amount of the alkoxysilane composition being 100 wt%, the alkoxysilane composition may contain, for example, dialkoxysilanes in content of 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 31 wt%, 32 wt%, 33 wt%, and 34 wt%.

[0027] Dialkoxysilanes include dialkyldialkoxysilanes, such as dialkyldimethoxysilanes or dialkyldiethoxysilanes, and in some embodiments, the dialkoxysilane is a dialkyldimethoxysilane.

[0028] More specifically, the dialkoxysilane is dimethyldimethoxysilane (CAS number: 1112-39-6).

[0029] When the total amount of the alkoxysilane composition is taken as 100 wt%, and the content of the dialkoxysilane is less than 10 wt%, the formed protective film cannot obtain satisfactory evaluations in adhesion strength measurements and solvent resistance measurements.

[0030] <Tralkoxysilane> With a total amount of alkoxysilane composition as 100 wt%, the alkoxysilane composition may contain trialkoxysilanes in amounts of, for example, 45 wt%, 50 wt%, 55 wt%, 60 wt%, 65 wt%, 70 wt%, and 75 wt%.

[0031] In some embodiments, with a total amount of alkoxysilane composition of 100 wt%, the alkoxysilane composition contains 60 wt% or less of trialkoxysilane.

[0032] When the alkoxysilane composition contains 60 wt% or less of trialkoxysilane, the formed protective film can be evaluated more favorably in adhesion strength measurements.

[0033] Trialkoxysilanes include alkyltrialkoxysilanes, such as alkyltrimethoxysilane or alkyltriethoxysilane, and in some embodiments, the trialkoxysilane is alkyltrimethoxysilane.

[0034] Alkyltrimethoxysilane may be methyltrimethoxysilane (CAS number: 1185-55-3). Trialkoxysilane may also be 3-(glycidyloxy)propyltrimethoxysilane (CAS number: 2530-83-8).

[0035] In some embodiments, the trialkoxysilane comprises both methyltrimethoxysilane and 3-(glycidyloxy)propyltrimethoxysilane.

[0036] In some embodiments, with a total amount of alkoxysilane composition of 100 wt%, the alkoxysilane composition contains methyltrimethoxysilane in an amount of 10 wt% to 25 wt% and 3-(glycidyloxy)propyltrimethoxysilane in a total amount of 40 wt% to 80 wt% (i.e., the total amount of methyltrimethoxysilane and 3-(glycidyloxy)propyltrimethoxysilane is 40 wt% to 80 wt%).

[0037] For example, assuming a total amount of alkoxysilane composition of 100 wt%, the alkoxysilane composition may contain methyltrimethoxysilane in amounts of 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, and 24 wt%.

[0038] <Tetraalkoxysilane> With the total amount of the alkoxysilane composition being 100 wt%, the alkoxysilane composition may contain, for example, tetraalkoxysilanes in content of 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, and 29 wt%.

[0039] Tetraalkoxysilanes include, for example, tetraethyl orthosilicate (CAS number: 78-10-4).

[0040] In some embodiments, the tetraalkoxysilane can be omitted by increasing the amount of trialkoxysilane.

[0041] Since the hydrolysis rate varies depending on the length (number of carbon atoms) of the alkoxy group, the reason for adopting ethoxysilane (such as tetraethyl orthosilicate etc.) as tetraalkoxysilane and methoxysilane (such as dialkyldimethoxysilane, alkyltrimethoxysilane etc.) as dialkoxysilane and trialkoxysilane is that it can be prepared so that the degree of hydrolysis is appropriate, the alkoxysilane composition can form an appropriate three-dimensional structure in subsequent reactions, and the properties of the protective film are improved.

[0042] <pH adjuster> The pH adjuster is for making the first agent acidic and promotes the hydrolysis of the alkoxysilane.

[0043] The pH adjuster can be, for example, a weak acid or a strong acid. The weak acid can be, for example, acetic acid or citric acid. The strong acid can be, for example, hydrochloric acid, hydrofluoric acid or sulfuric acid.

[0044] In some embodiments, the pH adjuster is a strong acid, such as hydrochloric acid.

[0045] The usage amount and concentration of the pH adjuster are not particularly limited as long as the pH value of the first agent can be made acidic or within the above pH value range.

[0046] <First solvent><000017)6>The first solvent contains water and alcohol and is for hydrolyzing the alkoxysilane composition together with the pH adjuster.

[0047] In some embodiments, the alcohol is isopropanol, but it can be other hydrocarbon group alcohols (R-OH, R is a hydrocarbon group) such as ethanol, 1-propanol, butanol etc.

[0048] Since the alcohol may cause an azeotropic phenomenon with water, the alcohol can be an alcohol containing water or an alcohol containing little water. [[ID=)3]]

[0049] In some embodiments, the alcohol is an alcohol (solution) with an alcohol concentration of 95 wt% or higher (in other embodiments, 99.5 wt% or higher).

[0050] Assuming a total amount of the first agent is 100 wt%, the first solvent may include alcohols with a content of 20 wt% to 30 wt%, for example, alcohols with a content of 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, and 29 wt%, and the remainder being water.

[0051] <Oxides> The oxide was selected from the group consisting of silicon dioxide, titanium dioxide, and zirconium dioxide, with at least one element being selected.

[0052] In some embodiments, the oxide is readily available silicon dioxide.

[0053] In some embodiments, the total amount of the first agent is 100 wt%, and the first agent further comprises oxides in a content of 5 wt% to 15 wt%, for example, oxides in a content of 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, and 14 wt%.

[0054] The first agent, when containing an oxide, further improves the abrasion resistance and scratch resistance of the formed protective film.

[0055] In some embodiments, the oxide is an oxide on a nanometer scale, specifically a dioxide with a particle size or dimension of 5 nm to 60 nm, for example, a dioxide with a particle size or dimension of 10 nm, 20 nm, 30 nm, 40 nm, or 50 nm.

[0056] In some embodiments, after mixing the components of the first agent, the components in the alkoxysilane composition are hydrolyzed by heating at 60°C to 80°C for 4 to 9 hours.

[0057] In some embodiments, the components of the first agent are mixed simultaneously or almost simultaneously, for example, by mixing the alkoxysilane composition, the first solvent, the pH adjuster, and the oxide at the same time.

[0058] <Second Agent> The second agent is alkaline.

[0059] The above alkalinity refers to a pH value exceeding 7, such as 7.5, 8, 8.5, 9, and 9.5, and in some embodiments, the pH value is 10 or higher, such as 10.5, 11, 11.5, 12, 12.5, and 13.

[0060] With a total amount of 100 wt% of the second agent, the second agent contains 20 wt% to 50 wt% of aminoalkylalkoxysilane and the remaining amount of the second solvent.

[0061] <Aminoalkylalkoxysilane> The second agent may contain aminoalkyl alkoxysilanes in amounts of 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34 wt%, 35 wt%, 36 wt%, 37 wt%, 38 wt%, 39 wt%, 40 wt%, 41 wt%, 42 wt%, 43 wt%, 44 wt%, 45 wt%, 46 wt%, 47 wt%, 48 wt%, and 49 wt%.

[0062] The aminoalkylalkoxysilane is not included in the alkoxysilane composition of the first agent and may specifically be 3-aminopropyltrimethoxysilane (CAS No.: 13822-56-5) or N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (CAS No.: 1760-24-3).

[0063] If the aminoalkylalkoxysilane content is within the above range, the entire second agent becomes alkaline, and after the second agent is mixed with the first agent to form a paint, the pH value of the first agent increases.

[0064] After the pH value rises, the polymerization reaction between the alkoxysilane composition in the paint and the aminoalkylalkoxysilane begins, polymerizing to form a polyalkoxysilane and creating a protective film.

[0065] Furthermore, since the aminoalkylalkoxysilane is designed to be present in the second agent, it is not added to the first agent.

[0066] In other words, the alkoxysilane composition contained in the first agent does not contain aminoalkylalkoxysilane.

[0067] <Second solvent> The second solvent contains alcohol, but does not require the separate addition of water; in other words, the second agent may contain water that is difficult to separate from the alcohol.

[0068] Specifically, assuming a total amount of the second agent is 100 wt%, the water content in the second agent is controlled to 5 wt% or less, for example, 0 wt%, 1 wt%, 2 wt%, 3 wt%, or 4 wt% or less.

[0069] To give a more specific example, when the second solvent contains alcohol at a concentration of 95 wt% or higher, and the total amount of the second agent is 100 wt%, the maximum water content in the second agent is (100 wt% - 20 wt%) × 0.05 = 4 wt%.

[0070] In some embodiments, the alcohol is isopropanol, but in other embodiments, the alcohol may be other hydrocarbon alcohols such as ethanol, 1-propanol, or butanol.

[0071] <Dosage of the first agent relative to the second agent> Based on the amount (weight) of the second agent used, the amount of the first agent used is 0.4 to 2 times the amount of the second agent used, for example, 0.5 times, 0.6 times, 0.7 times, 0.8 times, 0.9 times, 1 time, 1.1 times, 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, and 1.9 times.

[0072] The amount of the first agent used can be 0.6 times or more the amount of the second agent used when the alkoxysilane composition contains dialkoxysilane, trialkoxysilane, and tetraalkoxysilane simultaneously, and can be reduced to 0.4 times the amount of the second agent used when the alkoxysilane composition contains only dialkoxysilane and trialkoxysilane. [Examples]

[0073] <Example 1> In Example 1 of the paint set of the present invention, the paint set comprises a first agent and a second agent, which are packaged separately.

[0074] As shown in Table 3 below, with a total amount of 100 wt% of the first agent, the first agent comprises a 29 wt% alkoxysilane composition, a 60 wt% first solvent, a 1 wt% pH adjuster, and a 10 wt% oxide. The pH value of the first agent is approximately 3 to 4.

[0075] Taking the total amount of the alkoxysilane composition as 100 wt%, the alkoxysilane composition contains 24 wt% dimethyldimethoxysilane, 12 wt% methyltrimethoxysilane, 42 wt% 3-(glycidyloxy)propyltrimethoxysilane, and 22 wt% tetraethyl orthosilate.Taking the total amount of the alkoxysilane composition as 100 wt%, the amount of trialkoxysilane is 12 wt% + 42 wt% = 54 wt%.

[0076] The total amount of the first agent is 100 wt%, and the content of the first solvent is 60 wt%. Specifically, the total amount of the first agent is 100 wt%, and the first solvent contains 36 wt% water and 24 wt% isopropanol. The concentration of the isopropanol is 99.5% or higher.

[0077] The pH adjusting agent is hydrochloric acid with a concentration of 0.2 N.

[0078] The oxide is silicon dioxide with an average particle size of 10 nm to 15 nm.

[0079] After simultaneously mixing each component of the first agent, the mixture was heated at 80°C for 8 hours. After heating was complete, it was allowed to stand for later use.

[0080] With a total amount of the second agent being 100 wt%, the second agent comprises 31 wt% of 3-aminopropyltrimethoxysilane and 69 wt% of the second solvent.

[0081] The second solvent is isopropanol with a concentration of 99.5% or higher. The pH value of the second agent is approximately 11 to 12.

[0082] <Preparing the sample> Using the amount of the second agent as a baseline of 1, the paint was formed by simultaneously mixing the first agent at 0.78 times the amount and the second agent at 1 times the amount.

[0083] An appropriate amount of the paint was applied to a test sheet to form a coating layer approximately 10 μm thick. After the coating layer dried and formed a protective film, a sample was obtained. The test sheet was a tin sheet approximately 17 cm x 4 cm. The pH value after mixing the first agent and the second agent was approximately 6-7.

[0084] <Drying speed measurement> The drying rate was measured simultaneously with the production of the sample.

[0085] The specific measurement method involved applying the paint completely to the entire surface of the test sheet under conditions of 50°C. After a coating layer was formed that covered the entire surface, timing was started. The coating layer was touched with a finger at regular intervals, and when no visible fingerprints remained on the coating layer, it was determined that the coating layer had dried and formed a protective film. Timing was then stopped when it was determined that the layer was completely dry. The measurement results are recorded in Table 3.

[0086] <Adhesion force measurement> Adhesion strength was measured according to the measurement method of ASTM D3359. The measurement method is briefly described below. A cross-hatch cutter was used to cross-cut the protective film of the sample in a grid pattern, creating multiple intersecting cuts in the protective film and multiple square grids between the cuts. The adhesion strength between the protective film and the coated object was then evaluated by observing the peeling condition of the grids. The evaluation criteria are shown in Table 1. The measurement results are recorded in Table 3.

[0087] [Table 1]

[0088] <Solvent resistance measurement> Solvent resistance was measured according to the measurement method of ASTM D4752. The measurement method is briefly described below. A cheesecloth was folded in half and immersed in methyl ethyl ketone (MEK). The cheesecloth, thoroughly immersed in methyl ethyl ketone, was then used to perform 50 reciprocating frictions (for example, one reciprocating friction consisting of one leftward friction and one rightward friction) against the protective film of the sample. The solvent resistance of the protective film was then evaluated by observing the surface changes of the protective film. The evaluation criteria are shown in Table 2. The measurement results are recorded in Table 3.

[0089] [Table 2]

[0090] <Examples 2 to 6> Examples 2 to 6 are similar to Example 1, the only difference being the specific composition and proportion (wt%) of the first and second agents.

[0091] The specific compositions and proportions of the first and second agents in each example, as well as the ratio of the amount of the first agent used to the amount of the second agent used, are shown in Table 3.

[0092] Example 6 does not contain tetraalkoxysilane (tetraethyl orthosilate), and contains only dialkoxysilane and trialkoxysilane.

[0093] The same drying speed, adhesive strength, and solvent resistance measurements were performed for Examples 2 to 6, and the measurement results were recorded in Table 3 in the same manner.

[0094] <Comparative Example 1> Comparative Example 1 contains the first agent but does not contain the second agent. The specific composition of Comparative Example 1 is shown in Table 4. The composition of Comparative Example 1 is similar to the conventional polyalkoxysilane-based anticorrosive coating described in the background art, and since the film formation time is long, the drying rate measurement described above was not performed, and only adhesion strength measurement and solvent resistance measurement were performed. The measurement results are recorded in Table 4.

[0095] <Comparative Example 2 to Comparative Example 5> Comparative Examples 2 to 4 are similar to Example 1, the only difference being the amount of the first agent used relative to the amount of the second agent used. Details are shown in Table 4.

[0096] Comparative Example 5 primarily measured the effects of low dialkoxysilane content. The same drying rate, adhesive strength, and solvent resistance measurements were performed for Comparative Examples 2 to 5, and the measurement results were recorded in Table 4 in the same manner.

[0097] [Table 3]

[0098] [Table 4]

[0099] <Salt spray test> The following salt spray test was performed on Example 1. The measurement results are shown in Figure 1.

[0100] The measurement method for this test involves spraying a measurement solution onto the sample and observing the permeability resistance of the protective film. Specifically, a measurement solution is prepared, which is a sodium chloride aqueous solution with a concentration of 50±5 g / L (pH value is approximately 6.5-7.2). To confirm the effectiveness of the experiment, an incision is made in the protective film with a cutter, and then the measurement solution is sprayed onto the sample. After standing for one week in an environment with a temperature of 35±2°C and a relative humidity of RH>95%, the measurement results are observed. The above salt spray test can also be performed using an existing salt spray test apparatus.

[0101] <Explanation of experimental results> As shown in Figure 1, rust definitely formed in the unprotected areas of the salt spray test sample, i.e., the cut areas, while rust did not form in the areas protected by other protective films. Therefore, the protective film formed in Example 1 reliably prevents the penetration of salt and moisture, and can prevent corrosion caused by exposure to sea breeze.

[0102] Furthermore, according to the measurement results of Examples 1 to 6, the first agent contains an alkoxysilane composition in a content of 27 wt% to 39 wt%, a pH adjuster in a content of 1 wt%, and a first solvent in a content of 60 wt% to 72 wt%, and the second agent contains an aminoalkylalkoxysilane in a content of 25 wt% to 48 wt%, and the amount of the first agent used is 0.43 to 1.7 times the amount of the second agent, allowing for film formation in just about 3 hours under drying conditions of 50°C. Compared to conventional paints in the background art that require a drying time of 12 to 24 hours, the paint set of the present invention significantly reduces the drying time for film formation, greatly increasing the success rate of corrosion protection coating work.

[0103] Furthermore, the protective films of Examples 1 to 6 all received an evaluation of "Good" or higher in adhesive strength and solvent resistance measurements, thus demonstrating their value as commercial products.

[0104] In contrast, Comparative Example 1 lacks a second agent, and therefore, aside from the required drying time being as long as that of conventional paints in the background technology, all evaluations in adhesion strength measurement and solvent resistance measurement were "inferior," resulting in considerably low competitiveness as a product.

[0105] According to the measurement results of Examples 3, 4, and 6, when the total amount of the alkoxysilane composition is set at 100 wt%, if the trialkoxysilane content exceeds 60 wt% (75.3 wt% in Example 3, 62 wt% in Example 4, and 65.5 wt% in Example 6), the formed protective film is relatively hard and brittle, and its ductility is not as good as in Examples 1 and 2. Therefore, the evaluation of the adhesive strength of the protective films formed by Examples 3, 4, and 6 remains "good".

[0106] In contrast, according to the results of Examples 1 and 2, when the total amount of the alkoxysilane composition is 100 wt%, the trialkoxysilane content is 60 wt% or less (54 wt% in Example 1 and 42 wt% in Example 2). This indicates that the trialkoxysilane content is appropriate, and an excellent balance is achieved between dialkoxysilane, trialkoxysilane, and tetraalkoxysilane. As a result, the ductility of the formed protective film is superior, and a better evaluation was obtained in the adhesion strength measurement.

[0107] Furthermore, assuming a total amount of alkoxysilane composition of 100 wt%, the trialkoxysilane content in Example 5 is 60 wt% or less. However, since the amount of the first agent used is higher than the amount of the second agent used, the evaluation in the adhesion strength measurement remains "good".

[0108] According to the measurement results of Examples 1 to 5, when the amount of the first agent used was 0.4 to 2 times the amount of the second agent used, for example, 0.78 times, 0.71 times, 0.69 times, 0.75 times, 1.7 times, and 0.43 times, the evaluation of the adhesive strength and solvent resistance of the protective films formed by Examples 1 to 5 was "good" or better. When the amount of the first agent used was 0.6 to 0.8 times the amount of the second agent used, for example, under the conditions of Examples 1 to 4, the evaluation of the solvent resistance of the protective films formed by Examples 1 to 4 was "excellent".

[0109] According to the measurement results for Comparative Examples 2 to 3, when the amount of the first agent used is less than 0.4 times the amount of the second agent used, for example, when it is 0.1 times or 0.39 times, the amount of the first agent used is insufficient to provide sufficient components for film formation. As a result, the formed protective film has an unstable structure and is evaluated as "poor" in adhesive strength measurement.

[0110] Furthermore, according to the measurement results of Comparative Example 4, when the amount of the first agent used increased to 3.2 times the amount of the second agent used, the amount of the second agent was small, and the amount of 3-aminopropyltrimethoxysilane was also small. As a result, the degree of cross-linking between the components was insufficient, and the formed protective film could not obtain an evaluation that met the requirements in solvent resistance measurements.

[0111] According to the measurement results of Comparative Example 5, when the dialkoxysilane content was less than 10 wt% (specifically 2.5 wt%), the formed protective film did not meet the requirements in adhesive strength and solvent resistance measurements, specifically receiving a "poor" rating.

[0112] Based on the above, the effect of the paint set of the present invention is that the drying time required to form a protective film is significantly shortened by the action of the first and second agents, and the formed protective film can be evaluated with excellent results in adhesion strength measurement and solvent resistance measurement.

[0113] Specifically, the coating layer applied after mixing the first and second agents can dry and form a film in one morning or afternoon, significantly increasing the success rate of corrosion protection coating work. Furthermore, the formed protective film receives excellent evaluations in adhesion strength and solvent resistance measurements, thus satisfying market demand.

[0114] Therefore, the objectives of the present invention can be reliably achieved.

[0115] Table 5 shows the suppliers and specifications of the drugs used in each example and comparative example.

[0116] [Table 5]

[0117] The above embodiments are illustrative in illustrating the principles and effects of the present invention and do not limit it. A person skilled in the art can make some modifications and alterations to the above embodiments, provided that they do not deviate from the spirit and scope of the invention. Therefore, all modifications and alterations made by a person skilled in the art, provided that they do not deviate from the spirit of the invention, should also be considered to fall within the scope of protection of the present invention. [Industrial applicability]

[0118] The paint set of the present invention is suitable for forming a protective film for corrosion prevention.

Claims

1. A first agent and a second agent are included. The first agent is acidic and comprises an alkoxysilane composition in an amount of 25 wt% to 40 wt% of the total amount of the first agent, and the remainder of the first solvent. With a total amount of the alkoxysilane composition being 100 wt%, the alkoxysilane composition contains a content of 10 wt% or more of dialkoxysilane. The first solvent comprises water and alcohol. The second agent is alkaline, and with a total amount of the second agent of 100 wt%, it contains 5 wt% or less of water, and comprises 20 wt% to 50 wt% of aminoalkylalkoxysilane and the remainder of the second solvent. The second solvent contains alcohol, The first agent and the second agent are packaged separately. Based on the amount of the second agent used, the amount of the first agent used is 0.4 to 2 times the amount of the second agent used. The paint set is characterized in that the alkoxysilane composition does not contain aminoalkylalkoxysilane.

2. The alkoxysilane composition further comprises trialkoxysilane and tetraalkoxysilane. The paint set according to claim 1, characterized in that, based on the amount of the second agent used, the amount of the first agent used is 0.6 to 2 times the amount of the second agent used.

3. With a total amount of the alkoxysilane composition being 100 wt%, the alkoxysilane composition comprises a content of 10 wt% to 35 wt% of dialkoxysilane, a content of 40 wt% to 80 wt% of trialkoxysilane, and a content of 10 wt% to 30 wt% of tetraalkoxysilane. The paint set according to claim 1, characterized in that, based on the amount of the second agent used, the amount of the first agent used is 0.6 to 2 times the amount of the second agent used.

4. The paint set according to claim 3, wherein the total amount of the alkoxysilane composition is 100 wt%, and the alkoxysilane composition contains trialkoxysilane in an amount of 40 wt% to 60 wt%.

5. The paint set according to claim 4, characterized in that, based on the amount of the second agent used, the amount of the first agent used is 0.6 to 0.8 times the amount of the second agent used.

6. The paint set according to any one of claims 2 to 5, characterized in that the dialkoxysilane is a dialkyldimethoxysilane, the trialkoxysilane is an alkyltrimethoxysilane, and the tetraalkoxysilane is a tetraethyl orthosilate.

7. The paint set according to any one of claims 2 to 5, characterized in that the dialkoxysilane is dimethyldimethoxysilane, the trialkoxysilane comprises methyltrimethoxysilane and 3-(glycidyloxy)propyltrimethoxysilane, and the tetraalkoxysilane is tetraethyl orthosilate.

8. The paint set according to claim 7, characterized in that the aminoalkylalkoxysilane is 3-aminopropyltrimethoxysilane.

9. The total amount of the first agent is 100 wt%, and the first agent further contains an oxide in an amount of 5 wt% to 15 wt%, The paint set according to claim 1, characterized in that the oxide is selected from the group consisting of silicon dioxide, titanium dioxide, and zirconium dioxide, at least one of these.

10. The paint set according to claim 1, characterized in that, after mixing the components of the first agent, the mixture is heated at a temperature of 60°C to 80°C for 4 to 9 hours.

11. The paint set according to claim 1, wherein the total amount of the alkoxysilane composition is 100 wt%, and the alkoxysilane composition does not contain tetraalkoxysilane, and contains 10 wt% to 35 wt% of dialkoxysilane and the remaining trialkoxysilane.

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