JPH0437672A - Method for preventing rusting of metallic material in inorganic material such as concrete - Google Patents

Abstract

PURPOSE:To improve the waterproofness and salt intercepting property of an inorg. material such as concrete and to enhance the rust preventiveness of a metallic material in the inorg. material by applying a waterproofing agent made of a zircoaluminate type org. metallic complex on the surface of the inorg. material. CONSTITUTION:A waterproofing agent made of a zircoaluminate type org. metallic complex is prepd., applied and impregnated into the surface of an inorg. material such as concrete contg. a metallic material. A coating film of synthetic resin is then formed on the applied waterproofing agent.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to bridges, marine structures, buildings near the coast that are susceptible to salt damage, such as RC, SRC, lath mortar, and 5FRC structures, and precast boards. The present invention relates to a method for preventing rusting of metal materials such as steel contained in inorganic materials such as factory molded products.

(Prior Art) Conventionally, as a rust prevention method for this kind of metal materials, etc., as disclosed in JP-A-57-201444, for example, a synthetic resin containing a glass transition point of 0° C. or lower is used. A method of forming a coating film on the surface of an inorganic material such as concrete is known.

(Problems to be Solved by the Invention) However, the above-mentioned anti-caking method has low adhesion between the inorganic concrete surface and the six-organic paint film, which makes it easy to float and peel, and has poor water repellency and slow field properties. There are problems such as poor durability such as air barrier properties.

Therefore, as a rust prevention method to solve the above-mentioned problem, the present applicant previously proposed in Japanese Patent Application Laid-Open No. 1-203283, a method of applying a waterproofing agent made of aluminate to the surface of an inorganic material such as concrete containing a metal material, JP-A-2-5148 discloses a rust prevention method for metal materials in inorganic materials such as concrete, in which a synthetic resin film is formed on the waterproofing agent after impregnation.
In No. 3, a waterproofing agent made of organic zirconium is applied to the surface of an inorganic material such as concrete that contains a metal material,
We have proposed a rust prevention method for metal materials in inorganic materials such as concrete, in which a synthetic resin film is formed on the waterproofing treatment agent after impregnation.

The present invention is a further improvement of the rust prevention method proposed above, and is capable of improving the bonding stability of a surface treatment agent with an inorganic material and the adhesion of a synthetic resin coating to an inorganic material such as concrete. The purpose of this invention is to provide a rust prevention method for metal materials.

(Means for Solving the Problems) In order to achieve the above object, the present invention applies a surface treatment agent to the surface of an inorganic material such as concrete containing a metal material,
In a method for preventing rust of a metal material in an inorganic material by forming a synthetic resin film on the surface treatment agent after impregnation, the surface treatment agent is a surface treatment agent comprising a zircoaluminate-based organometallic complex. It is characterized by

Furthermore, before applying the treatment agent, an aqueous solution of inorganic salts and/or an aqueous solution of silicate compounds may be applied and impregnated on the surface of an inorganic material such as concrete.

The zircoaluminate-based organometallic complex of the surface treatment agent used in the present invention has good affinity with inorganic materials such as concrete, and there are no restrictions on the selectivity of the synthetic resin that forms the coating, etc. For example, the general formula % formula % "In the formula R alkyl group, alkenyl group, allyl group X, carboxyl group, amino group, methacryloquine group, mercapto group,
Epoxy group, hydrogen disorder. Carboxylado aluminum zirconium organometallic complex represented by ``, alkyl-methacryladoaluminum zirconium organometallic complex, serina-aluminum ruconium organometallic complex, ricinate aluminum zirconium organometallic complex, insteinatoaluminum zirconium organometallic complex Examples include complexes.

As a surface treatment agent, the above-mentioned zircoaluminum fast-type n
Examples include organic solvent-based surface treating agents in which one or two types of metal complexes are dissolved in an organic solvent such as methyl alcohol, methyl ether, or the like.

Further, the amount of the aluminum-based organometallic complex in the organic solvent-based surface treatment agent is about 0.5 to 409%. The coating rate of the surface treatment agent on the surface of the inorganic material is 50 to 60%.
0g/rr? degree.

In addition, examples of the synthetic resin for the film formed on the surface treatment agent include Epoquin resin, urethane resin, acrylic urethane resin, vinyl ester resin, polyurethane acrylic resin, acrylic resin, fluororesin, silicone resin, etc. Any one type of synthetic resin may be used alone, or two or more types may be used in combination. The film can be formed by coating these synthetic resin film materials as they are, or by coating them with a paint dissolved in an appropriate solvent. When using two or more types together, one film is formed and then the other is applied. Another coating may be formed on top of the coating. The amount to be applied is from several tens to several thousand g/min.

The above synthetic resins also include synthetic resins modified with flexible components such as reactive elastomers.

Further, various additives such as glass flakes, additives for improving the gas barrier properties of q+o:y, pigments, and °v' absorbers may be added to the synthetic resin.

In addition, examples of the inorganic salt aqueous solution that is applied and impregnated onto the surface of the inorganic material before applying the surface treatment agent include aqueous solutions of calcium nitrite, sodium nitrite, calcium phosphate, sodium chromate, and the like. Examples of the silicate compound aqueous solution include aqueous solutions of lithium silicate, calcium silicate, sodium silicate, ammonium silicate, and the like.

The aqueous solution may be used alone, or one of the aqueous solutions may be applied and then the other aqueous solution may be applied.

In addition, metal materials built into inorganic materials such as concrete may be metal materials such as steel that have been previously coated with epoxy resin paint.
Metal materials such as galvanized steel may also be used.

(Function) By applying and impregnating the surface of an inorganic material with a surface treatment agent made of a zircoaluminate-based organometallic complex, the hydroxyl groups of the zircoaluminate-based organometallic react with the inorganic material or its hydroxyl groups at room temperature, This reaction is irreversible.

Zircoaluminate-based organometallic complexes are structurally composed of zirconium and aluminum as cores, and exist as bonded complexes and organic functional groups, and the structure itself is thought to be stable.

In addition, by forming a synthetic resin film on the soil of the surface treatment agent, air barrier properties, water resistance, and resistance to adverse conditions are significantly improved.
Their durability is also improved.

This is thought to be because the organic functional groups of the zircoaluminate-based organometallic complex on the inorganic material enhance the affinity with the synthetic resin film formed on the surface treatment agent.

In addition, by coating and impregnating the surface of the inorganic material with an aqueous solution of inorganic salts and/or silicate compounds in advance, the metallic material in the inorganic material is given anti-caking properties by the coating formed from the aqueous solution, and its strong alkaline properties This increases the alkalinity of inorganic materials or retards the rate of neutralization.

(Example n Hereinafter, specific examples of the present invention will be described together with comparative examples.

Example 1 Each of CaCO3 and 5i02 was used as an inorganic material, and a myristirato/methacrylad mixed aluminum zirconium organometallic complex was used as a surface treatment agent. 2 parts of the surface treatment agent was added to 100 parts of the inorganic material, and dry forced stirring was performed for 5 minutes. Thereafter, as shown in Table 1, each inorganic material was mixed and stirred with its respective solvent to prepare a mixed slurry.

Then, the viscosity of each mixed slurry was measured, and the measurement results are shown in Table 1.

In addition, the viscosity of a slurry containing only an inorganic material to which no surface treatment agent was added was measured, and the measurement results are shown in Table 1.

The viscosity of the slurry was determined by measuring the slip rate using a rotational viscometer (E-type viscometer) at a temperature of 25°C after the slurry was prepared.

Comparative Example 1 A mixed slurry was prepared in the same manner as in Example 1, except that acetalkoxyaluminum cyisopropylate or dibutylsilconium isostearate 1 was used as the surface treatment agent added to the inorganic substance H. did.

Then, the viscosity of the valley mixed slurry was measured under the same conditions as in Example 1, and the measurement results are shown in Table 1.

Example 2 Eight rho203/3020 was used as an inorganic material, Carpoquin Aluminum J [conium organometallic complex was used as a surface treatment agent, and 3 parts of the surface treatment agent was added to 100 parts of the inorganic material, and 5 parts of the surface treatment agent was added to 100 parts of the inorganic material.
After dry forced stirring for a minute, the mixture was mixed with water and stirred to prepare a mixed slurry.

Then, the viscosity of the mixed slurry was measured under the same conditions as in Example 1, and the measurement results are shown in Table 2.

Further, the mixed slurry was washed with water for 0.25 hours, and then dried at a temperature of 100° C. for 12 hours, and the 111 powder was dissolved in water again to prepare a regenerated slurry.

Then, the viscosity of the recycled slurry was measured under the same conditions as in Example 1, and the measurement results are shown in Table 2.

In addition, the viscosity of a slurry containing only inorganic material without any surface treatment agent added to the inorganic material was measured under the same conditions as in Example 1, and the measurement results are shown in Table 2.

Comparative Example 2 Mixed slurries were prepared in the same manner as in Example 2, except that acetalkoxyaluminum diisopropylate or diisopropylzirconium diisostearate was used as the surface treatment agent added to the inorganic material.

Then, the viscosity of each mixed slurry was measured under the same conditions as in Example 1, and the measurement results are shown in Table 2.

In addition, each recycled slurry was prepared in the same manner as in Example 2 above.

Then, the viscosity of each recycled slurry was measured under the same conditions as in Example 1, and the measurement results are shown in Table 2.

As is clear from Tables 1 and 2, Example 1 of the present invention
．． In comparison with Comparative Examples 1 and 2, Sample No. 2 showed a significant decrease in viscosity (compared to the viscosity of a slurry made only of inorganic material to which no surface treatment agent was added).

In addition, in Example 2, compared to Comparative Example 2, the slurry was washed with water,
Even after drying and re-slurry treatment, the viscosity of the recycled slurry increased only slightly. This is thought to be because the surface treatment agent strongly binds to the surface of the inorganic material and is uniformly dispersed in the highly concentrated slurry, resulting in a lower viscosity of the slurry.

Therefore, in Example 1.2, compared to Comparative Example 12, the inorganic material was
! : It was confirmed that O-bond stability was improved.

Example 3 A surface treatment agent consisting of a 290 propylene glycol solution of a serinatoaluminum zirconium organometallic complex was applied to the surface of a menment board using asbestos of size 7 cm x 12 cm x 1 cm at a rate of 300 g/g, and then impregnated with epoxy resin. 400g of paint or urethane resin paint
/rf was applied to form an epoxy resin film or a urethane resin film, respectively.

Table 3 shows the adhesion properties of each resin coating, and the resulting results are shown in Table 3.

Comparative Example '3 An asbestos cement board was surface treated in the same manner as in Example 3, except that 300 g/rrl of a waterproofing agent consisting of a 296 isopropanol solution of acetalkoxyaluminum diisopropylate was used as the surface treatment agent. did.

The adhesion properties of each resin coating were investigated using the same method as in Example 3, and the results are shown in Table 3.

Comparative Example 4 Rib 7k An asbestos cement board was surface-treated in the same manner as in Example 3, except that 300 g/g of a waterproofing agent consisting of a 206 toluene solution of diisopropyl zirconium isostearate was used as the treatment agent.

Then, the adhesiveness of each resin coating was examined using the same method as in Example 3, and the results are shown in Table 3.

Adhesion was determined by immersing a surface-treated asbestos cement board in 5% salt water for 1 hour, then pulling it out of the salt water at a temperature of 70°C.
℃ and humidity of 85% for 1.5 hours, then cooled to -5℃ and held at that temperature for 3.5 hours. One cycle treatment was 100 continuous cycles. After that, the adhesion between the asbestos cement board and the resin coating was measured by the JIS-6909 adhesive strength test method.

Also, the measured adhesive strength of Comparative Example 3 (kg/C♂)
was used as the standard (1,0), and Example 3 and Comparative Example 4 were used as comparison values.

As is clear from Table 3, Example 3 of the present invention is Comparative Example 3
It was confirmed that the adhesion with the resin coating was improved compared to .

Example 4 Two selinate aluminum zirconium organometallic complexes were applied to the surface of a columnar structure made of concrete material with a rectangular cross-sectional side length of 30 cm and a height of 10 cm, which contained four reinforcing bars made of steel material with a diameter of 13 mm. After applying 300g/rd of surface treatment agent consisting of % propylene glycol solution and impregnating it, 400g/rn of epoxy resin paint was applied.
was applied to form an epoxy resin film.

After being exposed to 3% salt water spray for 90 days, the concrete material was broken and the surface of the steel material was observed, and no abnormality was observed.

Example 5 Before applying a surface treatment agent to the surface of the same columnar structure as in Example 4, a 30% aqueous solution of lucium nitrite was preliminarily applied.
The columnar structure was waterproofed in the same manner as in Example 2, except that it was coated with 0g/+ rubber and impregnated.

When the surface of the steel material was observed using the same method as in Example 4, no abnormality was observed.

(Effects of the Invention) According to the present invention, a surface treatment agent made of a zircoaluminate-based organometallic complex is applied to the surface of an inorganic material such as concrete containing a metal material and impregnated. Therefore, it is possible to improve the bonding stability with inorganic materials such as concrete, and it is also possible to modify the surface of the inorganic material to increase the affinity and firmly bond the inorganic material and surface treatment agent. Since a synthetic resin film is formed on the surface treatment agent, the adhesion of the synthetic resin film can be improved due to the affinity of the surface treatment agent made of a zircoaluminate-based organometallic complex. It has the effect of further increasing the durability of waterproofness and salt-forming properties, and has excellent anti-caking properties for metal materials.

In addition, before applying the zircoaluminate-based surface treatment agent consisting of a metal complex, an aqueous solution of inorganic salts and/or an aqueous silicate compound is applied to the surface of the inorganic material such as concrete to impregnate it. Metal materials have anti-caking properties due to a coating formed from an aqueous solution! A patent that has the effect of increasing the alkalinity in inorganic materials or slowing down the carbonation rate and improving the anti-caking properties of metal materials.Applicant: Jinyo Mitsui Construction Co., Ltd.
Rihito Kitamura Kingai 3 people

Claims (2)

[Claims] 1. In a rust prevention method for metal materials in inorganic materials, in which a surface treatment agent is applied to the surface of an inorganic material such as concrete containing metal materials and impregnated, and then a synthetic resin film is formed on the surface treatment agent. . A method for preventing rust of metal materials in inorganic materials such as concrete, characterized in that the surface treatment agent is a waterproofing agent made of a zircoaluminate-based organometallic complex. 2. 2. The inorganic material such as concrete according to claim 1, wherein an aqueous inorganic salt solution and/or an aqueous silicate compound solution is applied and impregnated onto the surface of the inorganic material such as concrete before applying the surface treatment agent. Rust prevention method for metal materials.