KR20090108357A - A rust inhibitor for iron and steel - Google Patents

Abstract

PURPOSE: A rust inhibitor for iron and steel is provided to effectively express colors and have a good adhesive force on a rust inhibition coating layer. CONSTITUTION: A rust inhibitor for iron and steel includes a cement 100 weight unit, a glass powder 10 to 300 weight unit, an epoxy resin 1 to 60 weight unit and a mixed water 50 to 500 weight unit. A glass bean 10 to 300 weight unit whose grain diameter is 1~500 micro meter is additionally included about the cement 100 weight unit. A rust inhibition material includes a coagulant, a hardener, a curing accelerator, a curing delay agent, an antifoaming agent or an expansion agent.

Description

Steel rust inhibitor {A RUST INHIBITOR FOR IRON AND STEEL}

The present invention relates to a steel anti-corrosive agent, and more particularly, has high water resistance, excellent anti-rusting performance and durability, excellent workability and economical efficiency, easy mixing of pigments, and effective in expressing color, and anti-rust coating is firm with steel. The present invention relates to a steel rust preventive method which is closely adhered to and has excellent adhesion to mortar or concrete on an rustproof coating layer, and a method of rust prevention of steel using the same.

Generally, corrosion of steel is caused by water or other electrolyte solution. Conventionally, the corrosion prevention method through the coating material is mainly applied as an anticorrosive method of general steel. This method protects by blocking iron and corrosive environment through the use of paints with low permeability, thickening of coatings and pigments with high barrier effect, and more resistant to ionizing pigments such as lead and iron. The method of applying and protecting zinc metal is mainly used. The general coating method is applied so as to apply rust preventive materials such as light list, zinc powder, chromium-based, and finishes with vinyl chloride, rubber, rubber, urethane and epoxy paint in the middle and top coats. These anticorrosive paints are effective in preventing corrosion of iron and have good durability, but contain heavy metals such as zinc, lead, and chromium in their ingredients, and because they require the use of toxic and ignitable organic solvents as diluents, In terms of safety hygiene, the usage regulations are gradually being tightened. Rust removal of the ground is also essential for workability, and it cannot be used on days when the ground is damp or high humidity. Particularly, these organic coating materials are required to be fully ventilated, exploded, and poisoned when working in confined spaces, and they are not suitable for structural and economical applications in the application of reinforcing steel or section steel that are coated with concrete in construction and civil engineering. It has a hard disadvantage.

In addition, a rust preventive admixture for concrete is used as a method of protecting the reinforcing steel in concrete from corrosion. The concrete admixture type rust preventive agent had a great effect when the water tightness of the concrete was secured, but the rust prevention effect was small when cracking of the concrete, and there was a problem that it was vulnerable to long-term rust preventive maintenance at the site of continuous salt penetration.

In addition, a series of repair processes have been proposed for repairing the fractured surface with polymer mortar after applying the nitrite-based bipolar rust preventive agent and the silicate aqueous solution to the rebar portion exposed by the corrosion prevention method of reinforcing steel embedded in concrete. This process is applicable to the repair of small areas where bar is partially exposed, but it is not suitable as a fundamental method for preventing corrosion of steel bars or for general corrosion protection of steels. In addition, Korean Patent Publication No. 153086 discloses an anticorrosive coating composition including an inorganic powder including cement, a synthetic polymer rubber dispersion, a fatty acid-based polymer aqueous dispersion, and a nitrite-based metal salt, but is still water resistant, antirust, and durable. There is no rust preventive agent to satisfy adhesion with steel and concrete, and there is an urgent need for this.

In order to solve the problems of the prior art as described above, the present invention is strong in water resistance, excellent in rust prevention performance and durability, excellent in workability and economical efficiency, easy to mix pigments, effective in expressing color, and anti-rust coating with steel The object of the present invention is to provide a steel anticorrosive agent that is firmly adhered and has excellent adhesion to mortar or concrete on the rustproof coating layer.

In order to achieve the above object, the present invention

a) 100 parts by weight of cement;

b) 10 to 300 parts by weight of the glass powder;

c) 1 to 60 parts by weight of an epoxy resin; And

d) 50 to 500 parts by weight of the compounded water

It provides a steel rust inhibitor comprising a.

In addition, the present invention in the anticorrosive method of steel,

It provides a steel rust prevention method characterized in that the steel rust inhibitor is applied to the surface of the steel.

Steel rust inhibitor of the present invention is strong in water resistance, excellent in rust prevention performance and durability, excellent in workability and economical efficiency, and easy to mix pigments, effective in expressing color, antirust coating is tightly adhered to steel, antirust coating Excellent adhesion to mortar or concrete on the floor.

Hereinafter, the present invention will be described in detail.

Steel rust inhibitor of the present invention a) 100 parts by weight of cement; b) 10 to 300 parts by weight of the glass powder; c) 1 to 60 parts by weight of an epoxy resin; And d) 50 to 500 parts by weight of the blended water.

The cement of a) used in the present invention may use a conventional cement used in the concrete admixture in the art.

These cements include ordinary cement, back cement, blast furnace cement, silica cement, fly cement, such as mixed cement and alumina cement, colloid cement, oil well cement, geothermal cement, acid resistant cement. Cement may be used depending on the particular application, but portland cement is particularly preferred in terms of construction costs and ease of purchase of materials.

In addition, the glass powder of b) used in the present invention, the glass powder does not absorb the resin or water, improves the cohesion of the steel rust inhibitor and at the same time increases the strength of the antirust coating layer, and increases the impact resistance and tensile strength. And inhibits contraction and expansion.

The glass powder may be used in a variety of particle shapes and sizes, the particles of the glass powder is obtained by pulverizing the glass, cullet, glass fiber, or glass curet, etc., the glass composition is A, C, E, alkali-resistant glass It will not specifically limit, if it is compatible with resin, such as a powder composition.

It is preferable that the particle diameter of the said glass powder is 10 nm-500 um, More preferably, it is 100 nm-50 um. When the particle diameter of the glass powder is within the above range, the strength of the anti-corrosion coating layer may be increased, and impact resistance and tensile force may be simultaneously increased.

The glass powder is preferably contained in 10 to 300 parts by weight with respect to 100 parts by weight of cement, more preferably 30 to 150 parts by weight. If the content of the glass powder is in the above range, it is better in suppressing shrinkage and expansion and in adhesion to steel and concrete.

The epoxy resin of c) used in the present invention is mixed with the cement and glass powder so that there is no disturbance in water, so that it has excellent water resistance and durability, and is particularly contained in the steel rust inhibitor of the present invention to improve adhesion to steel and concrete. To act.

The epoxy resin is preferably a solvent-diluted epoxy resin having a weight average molecular weight in the range of 350 to 3,000 MW among diglycidyl and triglycidyl types.

The epoxy resin is preferably contained in 1 to 60 parts by weight, more preferably 1 to 30 parts by weight based on 100 parts by weight of the cement in the steel rust inhibitor of the present invention. If the content is in the above range, it is better to improve the water resistance and durability.

As the compounded water of d) used in the present invention, general water may be used, and the content thereof is preferably included in an amount of 50 to 500 parts by weight based on 100 parts by weight of the cement in order to maintain an appropriate viscosity for construction.

 In addition, the steel rust inhibitor of the present invention may further include a glass bead (glass bead). The glass bead (glass bead) serves to increase the permeability to provide a very good fluidity by the ball bearing effect (ball bearing effect) of the glass bead to reach the narrow gap and deep, Provides good dispersibility for other mixtures. In addition, the cement, glass powder, epoxy resin, and dry mixtures exhibit excellent storage properties that are well mixed by simple stirring even after long-term storage, and provide high strength and impact resistance to the steel rust inhibitor of the present invention due to its high strength and hardness. do.

The glass beads may be of various particle sizes, and may be obtained by treating glass powder obtained by pulverizing glass, cullet, glass fiber, or glass curet, and the like. The glass composition may be A, C, E, alkali-resistant glass powder. It will not specifically limit, if it is compatible with resin and cement, such as a composition.

The glass beads may be spherical, elliptical, or glass beads of any shape equivalent thereto, and may be used, from those in which various sizes are distributed to those of only a predetermined size.

The particle diameter of the glass beads can be selected and used appropriately according to the construction target, preferably 1-500 ㎛ can be used.

The glass beads are preferably included in 10 to 300 parts by weight based on 100 parts by weight of cement. When the content is within the above range, the steel rust inhibitor has excellent durability and strength, and glass beads do not fall off.

In addition, the steel rust inhibitor of the present invention may further include a glass fiber (glass fiber).

The glass fiber acts to increase the tensile strength and crack resistance of the cured body through the role of the fibrous composite inside the cured cured body when the steel rust inhibitor is cured.

The glass fiber may be a long glass fiber of the E composition or a fiber or carbon fiber of the alkali resistance composition, specifically, a chopped fiber obtained by cutting a glass fiber having a fiber diameter of 10 to 20 ㎛ in a uniform strand length ) Or milled fibers prepared by milling to an average fiber length can be used. In particular, the chopped fiber is preferably cut to a fiber length of about 2 to 12 mm in consideration of the effect of the fiber, the ease of construction and the fluidity, permeability of the mortar composition, the pulverized fiber is a general fiber diameter of the crushed fiber, manufacturing In consideration of the convenience and the fibrous effect, the average fiber length is preferably from 100 to 300 µm. In particular, the pulverized fiber is preferable in view of ease of production, economy, tensile strength reinforcement and dispersibility, and may be used by mixing the chopped fiber and the pulverized fiber.

The glass fiber is preferably contained in 5 to 20 parts by weight with respect to 100 parts by weight of the cement, when the content is in the above range is excellent in the tensile strength of the cured cured body, cracks, shrinkage, and expansion does not occur There is an advantage.

In addition, the steel rust inhibitor of the present invention may further include a pigment to impart color to the steel rust inhibitor layer. The pigment may be applied to the cement admixture and the conventional pigments usable, the steel rust inhibitor of the present invention is particularly suitable for giving color to the steel rust inhibitor layer by the easy mixing of the pigment with the use of glass powder and epoxy resin. The pigment is preferably contained in 10 to 100 parts by weight based on 100 parts by weight of the cement in the steel rust inhibitor of the present invention.

In addition, the steel rust inhibitor of the present invention may further include silicone oil (silicone oil). The silicone oil is an oil-like nonvolatile flowable liquid mainly composed of organopolysiloxane. Steel rust preventive agent of the present invention will have a more strong water resistance and anti-fouling resistance when the silicone oil. The silicon oil is preferably contained in 10 to 100 parts by weight based on 100 parts by weight of the cement in the steel rust inhibitor of the present invention.

In addition, the steel rust inhibitor of the present invention may further include a monovalent metal compound. As the metal compound, for example, a calcium compound or a sodium compound may be used. When the steel rust inhibitor of the present invention includes the metal compound, when the sand, silica sand or glass beads are sprayed and attached to the steel rust preventive coating layer, the adhesion may be improved. The metal compound is preferably included in 0.001 to 50 parts by weight based on 100 parts by weight of the cement.

In addition, the steel rust inhibitor of the present invention can be used additives commonly used in steel rust inhibitors, such as a flocculant, a curing agent, a curing accelerator, a curing retardant, an antifoaming agent, an expanding agent.

In another aspect, the present invention provides a method for rust prevention of the steel, characterized in that the steel rust preventive agent is applied to the surface of the steel bar, the steel is rust prevention for rust prevention, such as steel in the exposed steel and concrete Of course, this means all the steel that is requested. In particular, the rust prevention method of the present invention is particularly effective when applied to a place that is in contact with moisture for a long time excellent in water resistance, durability, and adhesion to the rebar and concrete. This is more effective, for example, in the rust prevention of exposed steel such as steel, tech plates, railways, vehicle stacks, dams, bridges, tunnels, etc., and steel in concrete.

In addition, in the steel rust prevention method of the present invention, the coating may be applied through a common coating method such as spray, brush, roller, etc., the coating thickness may be appropriately adjusted according to the use of the steel applied. Preferably the coating thickness is 50 um to 3 mm. If it is in the above range can be satisfied at the same time durability, durability and economy.

In addition, in the steel rust prevention method of the present invention, sand, silica sand (including color silica), or glass beads are sprayed onto the surface of the steel rust inhibitor coating layer before application of the steel rust preventive agent to harden the sand, silica sand, or glass beads. You can. The particle size and amount of the sand, silica sand, or glass beads to be sprayed can be appropriately selected by those skilled in the art, in this case it can further improve the durability and weather resistance of the steel rust inhibitor by blocking ultraviolet rays to the coated steel rust inhibitor.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention, and the scope of the present invention is not limited to the following examples.

EXAMPLE

Example 1

500 g of a glass powder having an average particle size of 100 nm and 300 g of an epoxy resin were added to 1 kg of cement, and 1.0 L of compounded water was uniformly mixed to prepare a steel rust inhibitor.

Example 2

A steel rust inhibitor was prepared in the same manner as in Example 1, except that 500 g of glass beads having an average particle size of 50 μm was further included in Example 1.

Example 3

A steel rust preventive agent was prepared in the same manner as in Example 1 except that Example 1 further included 100 g of crushed glass fibers having an average fiber thickness of 13.5 μm and an average fiber length of 300 μm.

Example 4

A steel rust preventive agent was prepared in the same manner as in Example 1, except that 100 g of the pigment was further included in Example 1.

Example 5

A steel rust preventive agent was prepared in the same manner as in Example 1, except that 200 g of silicone oil was further included in Example 1.

As a result of measuring the properties of water resistance, durability, rust resistance, adhesive strength, hardness, etc. with respect to the steel rust inhibitors prepared in Examples 1 to 5, the steel rust inhibitors of Examples 1 to 5 manufactured according to the present invention were conventional rust inhibitors. All showed excellent compared with.

In addition, after the application of the steel rust inhibitors of Examples 1 to 5 was applied to the steel rust inhibitor by spraying sand, silica sand and glass beads before curing, respectively, it was confirmed that durability and weather resistance were further improved.

The present invention described above is not limited to the above detailed description and examples, and various modifications and changes of those skilled in the art are possible without departing from the spirit and scope of the present invention as set forth in the claims below. Of course it is also included within the scope of the present invention.

Claims (13)

a) 100 parts by weight of cement; b) 10 to 300 parts by weight of the glass powder; c) 1 to 60 parts by weight of an epoxy resin; And d) 50 to 500 parts by weight of the compounded water Steel rust inhibitor comprising a. The method of claim 1, The particle diameter of the glass powder of b) is 10 nm-500 micrometers, The steel corrosion inhibitor. The method of claim 1, Steel anti-corrosive agent, characterized in that it further comprises 10 to 300 parts by weight of glass beads having a particle size of 1-500 ㎛ with respect to 100 parts by weight of cement. The method of claim 1, Glass fiber or carbon fiber having a fiber diameter of 10 to 20 μm with respect to 100 parts by weight of cement, or chopped fiber cut to a uniform strand length, or pulverized fiber obtained by grinding the average fiber length to 100 to 300 μm (milled fiber) Steel rust inhibitor further comprises 5 to 20 parts by weight. The method of claim 1, Steel rust inhibitor further comprises 10 to 100 parts by weight of the pigment with respect to 100 parts by weight of the cement. The method of claim 1, Steel anti-corrosive agent, characterized in that it further comprises 10 to 100 parts by weight of the corn cone with respect to 100 parts by weight of the cement. The method of claim 1, Steel rust inhibitor further comprises 0.001 to 50 parts by weight of the monovalent metal compound based on 100 parts by weight of the cement. The method of claim 1, The steel rust inhibitor further comprises a flocculant, a curing agent, a curing accelerator, a curing retardant, an antifoaming agent or an expanding agent. In the method of rust prevention of steel, The steel rust preventive method according to any one of claims 1 to 8, wherein the steel rust preventive agent is applied to the surface of the steel. The method of claim 9, The coating is antirust method of the steel, characterized in that applied to a thickness of 50 um to 3 mm. The method of claim 9, The steel is a method of rust prevention, characterized in that the steel constituting the ship, deck plate, vehicle loading, railroad, dam, pier, tunnel exposed steel or steel in concrete. The method of claim 9, The method for rust prevention of steel, characterized in that the sand, silica sand or glass beads are applied to the coated surface before the curing after the application of the steel rust inhibitor. The method of claim 12, The steel rust preventive method of the steel rust prevention method comprising a 0.001 to 50 parts by weight of a monovalent metal compound based on 100 parts by weight of the cement.