JP2000345533A - Waterproof and erosion-proof concrete block with modified shape and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a labor-saving manufacturing method for concrete blocks with modified shapes having excellent waterproof and erosion-proof properties. SOLUTION: These are concrete blocks with modified shapes covered with resins such as polyurea resin, or sequentially epoxy resin, polyurethane resin, and polyurea resin. Also, on the inner surfaces of a forming formwork, polyurea resin or sequentially polyurea resin, polyurethane resin and epoxy resin are coated and a coating is formed, thereafter concrete is poured and a block is formed thereby transferring and forming the coating to the block.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof / corrosion-resistant deformed concrete block and a method for producing the same, and more particularly to a resin-coated deformed concrete block excellent in waterproofness, acid resistance, alkali resistance and mechanical strength. The present invention relates to a labor-saving manufacturing method.

[0002]

2. Description of the Related Art Conventionally, concrete wave-dissipating blocks,
When a deformed block such as a block for consolidation or a concrete block is used in a natural environment such as a sea or a river, the concrete surface may be flooded, corroded, and the block may collapse. In order to prevent this, after forming the deformed block, a means of applying and spraying a waterproofing agent or the like on the block surface to form a film such as a resin and bonding the film to the block has been adopted.

As the waterproofing agent, an epoxy resin-based reactive curable resin, an asphalt emulsion, a rubber-modified asphalt emulsion, and the like are used. As the anticorrosive, an epoxy resin-based reaction curable resin is frequently used.

However, in this case, the block is huge,
Since it was extremely heavy, it was troublesome and time-consuming, and the work was sometimes dangerous. Further, in the case of spraying, a large amount of a waterproof agent or the like is wasted regardless of the formation of the coating, and uneven thickness of the coating and occurrence of pinholes are unavoidable, resulting in poor appearance. Furthermore, the conventional waterproofing agent and anticorrosive agent may not be able to sufficiently satisfy the performance required for a film used under severe conditions. For example, in some cases, the adhesiveness between the deformed block and the coating is low, or the performance of the coating itself is not sufficient.

[0005] Epoxy resin-based coatings can be adhered to concrete, but the epoxy resin coatings have insufficient elongation characteristics to follow the cracks generated in the deformed blocks, and therefore exhibit sufficient waterproofing and anticorrosion functions. Can not. Therefore, it is conceivable to use an epoxy resin-based waterproofing agent or a polyurethane resin-based waterproofing agent that imparts elongation characteristics to the coating, but the coating made of them generally has a problem of low mechanical strength. Furthermore, asphalt-based waterproofing agents have a problem that adhesion to concrete is very low and mechanical strength is low.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a waterproof property capable of withstanding use as a seawall material for coasts, rivers, and the like.
It is an object of the present invention to provide a deformed concrete block having a coating having corrosion resistance (acid resistance and alkali resistance) and mechanical strength, and a method for manufacturing the same in which labor and time are remarkably reduced and labor is saved.

[0007]

Means for Solving the Problems The first invention of the present invention is:
A waterproof / corrosion-resistant deformed concrete block characterized in that the deformed concrete block is coated with a polyurea resin.
A method for manufacturing a waterproof / corrosion-resistant deformed concrete block, comprising coating a polyurea resin, injecting ready-mixed concrete, curing the concrete, removing the mold, and forming a block having a polyurea resin coating.

[0008] A second invention of the present invention is a waterproof / corrosion-resistant deformed concrete block characterized in that the deformed concrete block is sequentially coated with an epoxy resin, a polyurethane resin and a polyurea resin. The inner surface of the mold is coated with a polyurea resin, a polyurethane resin film is formed on the cured film, and an epoxy resin film is further formed on the dried multilayer film. It is a method for producing a waterproof / corrosion-resistant deformed concrete block, which comprises injecting ready-mixed concrete, demolding the concrete after hardening, and forming a block having a multilayer coating.

The preferred present invention is the waterproof / corrosion-resistant deformed concrete block according to the first invention, wherein the deformed concrete block and the polyurea resin film are adhered to each other. A preferred present invention is the waterproof / corrosion-resistant deformed concrete block according to the second invention, wherein the deformed concrete block and the epoxy resin coating are adhered to each other, wherein the epoxy resin coating, the polyurethane resin coating and the polyurethane resin coating are provided. And a polyurea resin film are adhered to each other.

In a further preferred aspect of the present invention, the polyurea resin is obtained by reacting a polyamine of the following (1) with a polyisocyanate of the following (2). And a method for producing the same. (1) a polyamine containing a polyalkylene ether polyamine having an amino group bonded to a terminal secondary carbon atom of the polyalkylene ether; and (2) an isocyanate residue obtained by reacting an active hydrogen-containing compound with a polyisocyanate. Isocyanate prepolymers or mixtures of said isocyanate prepolymers and polyisocyanates.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A deformed concrete block is a four-handed wave-dissipating block used as a seawall on a seashore or a river bank, a projecting-type wave-dissipating block having a protrusion above a four-handed shape, reinforcing around a pier, and the like. Means a stiffening block, a protective bed block laid on a riverbed, a retaining block used to prevent landslides on slopes, and the like.

The first invention relates to a structure in which a deformed concrete block is covered with a polyurea resin and a method for producing the same. The coating referred to here means that the polyurea resin film shrinks, comes into close contact with the concrete block and adheres, to the case where the coating is partially or wholly adhered to the block. Include.

The polyurea resin film constituting the present invention is a cured film formed by, for example, a reaction between an isocyanate prepolymer and a polyamine. Preferred polyurea resins are
It is obtained by reacting the following polyamine (1) with the following polyisocyanate (2). (1) a polyamine containing a polyalkylene ether polyamine having an amino group bonded to a terminal secondary carbon atom of the polyalkylene ether; and (2) an isocyanate residue obtained by reacting an active hydrogen-containing compound with a polyisocyanate. Isocyanate prepolymers or mixtures of said isocyanate prepolymers and polyisocyanates.

The polyurea resin film has a tensile strength of 9.8 MPa or more and a breaking elongation of 100% or more in order to maintain the abrasion property of the concrete block, the ability to follow cracks, and the impact resistance against impact of driftwood and the like. It is preferred to have. It is particularly preferred that the coating has an elongation at break of 200% or more and is elastomeric. The resin film has a thickness of 300 to 3000 g /
cm ² , preferably 500 to 2000 g / cm ² , exhibits excellent effects such as waterproofness, corrosion resistance, weather resistance, heat resistance, abrasion resistance, and hardness.

The polyalkylene ether polyamine having an amino group of the above (1) can be prepared, for example, by using a polymerization initiator such as ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, ethylenediamine, or aromatic diamine. And a lower alkylene oxide such as butylene oxide or a mixture thereof, and is obtained by substituting an amino group for a hydroxyl group present at a terminal of a polyether obtained by the reaction. For example, it can be obtained by a reductive amination reaction of a hydroxyl group bonded to a terminal secondary carbon of polypropylene glycol. Specifically, a diamine having an average molecular weight of 200 to 4,100, a molecular weight of 400 to 5,500 obtained by reductive amination of a hydroxyl group bonded to a terminal secondary carbon of polypropylene triol having trimethylolpropane or glycerin as a core. Triamine and the like. These are used alone or in combination of two or more.

The amine-terminal chain extender used for the modification of the polyalkylene ether polyamine having an amino group of the above (1) is not particularly limited. For example, 1-methyl-3,5-diethyl-2,4- Diaminobenzene, 1
-Methyl-3,5-diethyl-2,6-diaminobenzene, 1,3,5-triethyl-2,6-diaminobenzene, 3,3 ′, 5,5′-tetraethyl-4,4′-diaminodiphenylmethane , N, N'-bis (t-butyl) ethylenediamine, di (methylthio) toluenediamine and the like. Preferred are 1-methyl-3,5-diethyl-2,4-diaminobenzene, 1-methyl-3,
5-diethyl-2,6-diaminobenzene and di (methylthio) toluenediamine. These amine terminal chain extenders are used alone or in combination of two or more.

The active hydrogen-containing compound (2) is not particularly restricted but includes, for example, polyhydric alcohols such as ethylene glycol, propylene glycol, glycerin, hexylenetriol and trimethylolpropane, ethylene glycol, glycerin, trimethylolpropane, and the like. Using ethylenediamine, an initiator such as aromatic diamine, ethylene oxide, propylene oxide, polyethylene glycol obtained by reacting a lower alkyl oxide such as butylene oxide or a mixture thereof, cationic polymerization of polyethylene propylene glycol, polypropylene glycol, tetrahydrofuran. Polyether polyols such as polytetramethylene ether glycol,
Polyester polyols such as polyethylene adipate glycol, polyethylene propylene adipate glycol, polybutylene adipate glycol, polyhexamethylene adipate glycol, polycaprolactone glycol, acrylic polyol, phenolic resin polyol, epoxy polyol, butadiene polyol,
Polyols such as polyester polyether polyols, polycarbonate polyols and vegetable oils and the above-mentioned (1) polyalkylene ether polyamines having an amino group.

Preferred are polyether polyols having a molecular weight of 200 to 6,000, and amine-terminated polyalkylene ethers having a molecular weight of 200 to 6000. These are used alone or in combination of two or more.

The isocyanate prepolymer obtained by reacting the active hydrogen-containing compound with polyisocyanate in the above (2) is a prepolymer having one or more isocyanate residues in one molecule. Further, the isocyanate prepolymer may contain a polyisocyanate monomer that has not reacted with the active hydrogen compound.

For example, a reaction product of a polyisocyanate with a polyol and / or an amine-terminated polyether, wherein the isocyanate group 1 of the polyisocyanate
0.02 to 0.4 hydroxyl groups of the polyol per unit, or 0.02 to 0.02 of the amino groups of the amine-terminated polyether
It is a reaction product having a composition of 0.4 or a total of 0.02 to 0.4 hydroxyl groups of the polyol and amino groups of the amine-terminated polyether, and has a viscosity of 1 at 25 ° C.
000MPa · S or less, preferably 3,000MPa
a · S or less.

Examples of the polyisocyanate include isophorone diisocyanate (IPDI), 1,6,11-undecane triisocyanate, m-xylylene diisocyanate (MXDI), 1,8-diisocyanate-4-isocyanatomethyloctane, bis ( 4-isocyanatocyclohexyl) methane (hydrogenated MDI), hexamethylene-1,6-diisocyanate (HDI), 4,4 ′
-Diphenylmethane diisocyanate (MDI), tetramethylxylylene diisocyanate (TMXDI),
Examples thereof include 2,4-tolylene diisocyanate (TDI), norbonene diisocyanate, and isocyanurates, uretdione, carbodiimide-modified products, and uretonimine-modified products thereof.

Preferred are IPDI, MXDI, NBD
I, MDI and their carbodiimide-modified and uretonimine-modified products. Particularly preferred are MDI and MDI.
XDI, NBDI and their carbodiimide modified products and uretonimine modified products. These are used alone or in combination of two or more.

In the above-mentioned polyurea resin, the polyalkylene ether polyamine having an amino group (1) is used in an amount of 500 parts by weight or less, preferably 10 to 300 parts by weight, based on 100 parts by weight of an amine terminal chain extender. Is done. In this case, the reaction is extremely fast, and it is not necessary to use a catalyst. Therefore, a combination of an efficient high-speed mixing method and a component having a reaction rate suitable for sprayability and film forming property is important. In this case, it is not affected by moisture and moisture and reacts and cures even at a low temperature of 0 ° C. or less. The resulting polyurea resin is tough and elastic, and has excellent chemical resistance, heat resistance, and water resistance. Having.

The polyurea resin of the present invention is disclosed in US Pat. Nos. 4,379,729 and 4,433,06.
No. 7 and No. 4,444,910, quasi-prepolymers in which some of the isocyanate groups produced from amine-terminated polyethers, aromatic diamine chain extenders, polyisocyanates and polyols remain unreacted And the polyisocyanate may be an aromatic polyisocyanate.

In the present invention, an ultraviolet absorber, a radical scavenger, a coloring agent, an extender, a plasticizer, a flame retardant, an additive, and the like can be added to the polyurea resin as required. .

As the UV absorber, for example, "RUV
A "-93 (manufactured by Otsuka Chemical Co., Ltd.)," Tinuvin "-P,
Examples include "Tinuvin" -144, "Tinuvin" -320 (manufactured by Ciba-Geigy), HCB (manufactured by Dow), and "Sumisorb" -100 (manufactured by Sumitomo Chemical Co., Ltd.).

As a radical scavenger, "Simasolve" is used.
-622, "Simasolve" -944, "Irganox" -1010, and "Irganox" -245 (manufactured by Ciba Geigy).

Coloring agents include zinc white, ultra marine, carbon black, cadmium red, cobalt green, cobalt violet, cobalt blue, chromium oxide green, titanium oxide, cerulean blue, titanium yellow, plush blue, mars violet, and bengala. , Permanent Red, Hansa Yellow, Phthalocyanine Green, Phthalocyanine Blue,
Benzidine yellow and lake red are exemplified.

As extenders, alumina, kaolin,
Activated carbon, activated clay, glass balloon, glass beads, glass flakes, glass powder, graphite, diatomaceous earth, acid clay, silica, zirconia, aluminum hydroxide, slag, zeolite, talc, calcium carbonate, magnesium carbonate, titania, dolomite, bentonite, Examples include mica, magnesia, montmorillonite, and barium sulfate.

As the plasticizer, dioctyl phthalate,
And dibutyl phthalate. Examples of the flame retardant include trisdichloropropyl phosphate (manufactured by Daihachi Chemical Co., Ltd.). These compounding agents are used in combination with the polyamine of the above (1) for forming a polyurea resin.

The second invention relates to a structure in which a deformed concrete block is sequentially coated with an epoxy resin, a polyurethane resin and a polyurea resin, and a method for producing the same. The coating referred to here means that each coating or multilayer coating shrinks, comes into close contact with and adheres to the concrete block, to the case where the epoxy resin coating partially or completely adheres to the block. Is included.

The second invention is a deformed concrete block having a multilayer coating structure in which an epoxy resin coating and a polyurethane resin coating and a polyurethane resin coating and a polyurea resin coating are adhered. The epoxy resin coating adheres to the deformed concrete block and also adheres to the polyurethane resin coating, and functions as a primer for the polyurea resin coating. The polyurethane resin film adheres to the polyurea resin film and functions as a primer by adhering to the polyurea resin film.

That is, the polyurea resin coating has low adhesion to the concrete block, while the epoxy resin coating has high adhesion to the deformed concrete block. By interposing the coating, the polyurea resin coating can be adhered to the concrete block. As a result, the waterproofness, corrosion resistance, weather resistance, heat resistance, abrasion resistance, impact resistance, hardness, and the like provided by the polyurea resin film are more remarkably exhibited.

The coating amount of the epoxy resin film and the polyurethane resin film is 5 to 500 g each as a dry film.
/ M ² , preferably 50 to 150 g / m ² , without defects such as pinholes. The coating amount corresponds to a film thickness of about 5 to 500 μm, preferably about 50 to 150 μm. The coating amount of the polyurea resin film is, 300~3,000g / cm ² as a dry thickness is preferably 500~2,000g / cm ^2.

The epoxy resin includes a resin having two or more epoxy groups in one molecule and, if necessary,
It is a cured resin produced by reacting a curing agent with a base comprising a reactive diluent having one or more epoxy groups in the molecule and a modifier, and a curing agent.

The epoxy resin has, for example, an epoxy equivalent (g
/ Epoxy group: the same applies hereinafter) in the range of 165 to 550, bisphenol A type epoxy resin, bisphenol A
D type epoxy resin, bisphenol F type epoxy resin,
Novolak type epoxy resin having an epoxy equivalent of 170 to 250, diglycidyl phthalate having an epoxy equivalent of 160 to 350, glycidylamines having an epoxy equivalent of 100 to 250, and a molecular weight of 700 to 1, having the epoxy resin and a polyethylene glycol chain. And 500 addition products with amines. These are used alone or in combination of two or more. Among these, bisphenol A type epoxy resin, bisphenol AD type epoxy resin, and bisphenol F type epoxy resin which are liquid at 25 ° C. are preferable.

Examples of the reactive diluent having one or more epoxy groups in one molecule include n-butyl glycidyl ether prepared from alcohols having 4 or more carbon atoms, and glycidyl of alcohol having 11 to 14 carbon atoms. Monoglycidyl ethers such as ethers, polyfunctional glycidyl ethers such as 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, phenylglycidyl ethers prepared from phenols, and γ-glycidoxypropyltrimethoxysilane And the like. These are blended as needed for the purpose of lowering the viscosity or imparting flexibility.

As a curing agent for the epoxy resin, for example,
Polyethylene polyamines, polyalkylene ether polyamines, chain aliphatic polyamines such as polymethylene polyamine, norbornene diamine, N-aminoethyl piperazine, cyclic aliphatic polyamines such as isophorone diamine,
Polyamines composed of at least one of aliphatic aromatic amines such as xylylenediamine, amidoamines composed of the polyamines and fatty acids, and modified polyamines derived from the polyamines are preferable because they are curable at room temperature.

Examples of the modifying agent include chroman, indene, dicyclopentadiene, benzyl alcohol, and xylene resin. The epoxy resin and / or the curing agent are used in the form of a non-solvent type, a solvent type dissolved in a solvent, a water dilution type dissolved or dispersed in water, or the like in consideration of workability and the like.

In the second invention, the polyurethane resin film is interposed between the polyurea resin film and the epoxy resin film. Polyurethane resin is polyisocyanate,
A one-part liquid curing polyurethane prepolymer having an isocyanate residue at the molecular terminal obtained by reacting a polyol having two or more primary alcohol and / or secondary alcohol terminals in one molecule with moisture. This is a two-pack type polyurethane resin in which an organic solution of a type polyurethane resin or polyisocyanate and an organic solution containing a polyol and a catalyst are mixed at a predetermined ratio immediately before application. The polyurethane resin is used alone or in combination of two or more.

The one-pack type polyurethane resin is not particularly limited, and is, for example, a product obtained by reacting a polyether polyol with 4,4′-diphenylmethane diisocyanate in the presence of a dibutyltin dilaurate catalyst, An organic solvent solution of a polyurethane prepolymer having an isocyanate residue can be used.

As the first component liquid of the two-pack type urethane resin,
For example, a solution of an acrylic polyol which is a reaction product of methyl acrylate, styrene and 2-hydroxy methacrylate, a solution of a polycaprolactone polyol, or a solution of a polyester polyol which is a reaction product of neopentyl glycol, adipic acid and isophthalic acid Is raised. Examples of the second component liquid include a solution composed of an adduct, buret, or isocyanurate solution of trimethylolpropane such as toluene diisocyanate, m-xylylene diisocyanate, and hexamethylene-1,6-diisocyanate.

Other examples of the polyisocyanate include:
Isophorone diisocyanate, 1,6,11-undecane triisocyanate, xylylene diisocyanate,
Cyclohexane-1,4-diisocyanate, 4,4 ′
-Dicyclohexylmethane diisocyanate, 1,8-
Diisocyanate-4-isocyanate tetramethylxylene diisocyanate, 3,3′-dimethyl-4,
4′-dicyclohexylmethane diisocyanate, 1,
6-hexamethylene diisocyanate, 4,4'-diphenylmethane diisocyanate, tetramethylxylylene diisocyanate, tolylene diisocyanate, and the like. These can be used alone or in combination of two or more.

Other polyols include polyether polyols such as polyethylene glycol, polypropylene glycol and polytetramethylene glycol, polyethylene adipate glycol, polyethylene propylene adipate glycol, polybutylene adipate glycol, polyhexamethylene adipate glycol, and the like.
Examples thereof include polyester polyols such as polycaprolactone glycol, and acrylic polyols. Further, as a chain extender, low molecular weight aliphatic, aromatic, heterocyclic and other glycols, trimethylolpropane and other triols, ethanolamine and other amino alcohols, and other sucrose and other high hydroxyl values. Polyols and the like. These can be used alone or in combination of two or more.

The organic solvent for the polyurethane resin is not particularly limited as long as it can dissolve the polyurethane resin. For example, an organic solvent containing at least one selected from ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, toluene, and xylene is preferable because it enhances the adhesion between the polyurethane resin and another coating.

For forming the polyurethane resin film, a catalyst for controlling drying and curing is used. Examples of the catalyst include tertiary amines such as triethylenediamine, triethylamine, tetramethylbutanediamine, dimorpholinodiethylether, and dibutylamine. Tin dilaurate, tin octate
And the like. These may be used alone or in combination of two or more.

The epoxy resin film of the present invention and / or
Or as a polyurethane resin film, if necessary, zinc white, ultramarine, carbon black, cadmium red, cobalt green, cobalt violet, cobalt blue, chromium oxide green, titanium oxide, cerulean blue, titanium yellow, plush blue, Color pigments such as Mars Violet, Bengala, Permanent Red, Hansa Yellow, Phthalocyanine Green, Phthalocyanine Blue, Benzidine Yellow, Lake Red, etc., alumina, kaolin, activated carbon, activated clay,
Glass balloon, glass beads, glass flake, glass powder, graphite, diatomaceous earth, acid clay, silica, zirconia, aluminum hydroxide, slag, zeolite,
Talc, calcium carbonate, magnesium carbonate, titania, dolomite, bentonite, mica, magnesia,
An extender pigment such as montmorillonite and barium sulfate can be blended.

The polyurea resin used in the second invention is not different from that of the first invention, and is used similarly.

The waterproof / corrosion-resistant deformed concrete block of the present invention usually uses an iron form panel, assembles a form having an open top, and previously forms a resin film such as a polyurea resin film on the inner surface of the form. Then, put ready-mixed concrete inside the formwork, compact it, finish the top end exposed at the opening, cure the concrete, disassemble the formwork, take out the formed block from the formwork A resin film such as a polyurea resin film is formed on the top end, and a resin film such as a polyurea resin film is transferred and formed on the entire surface of the deformed concrete block to obtain a product. The present invention is characterized in that a resin film such as a polyurea resin film is previously formed on the inner surface of a mold before the ready-mixed concrete is cast, and the film is finally transferred to a deformed block.

The coating method of the present invention is not particularly limited as long as it can spray-coat a polyurea resin or the like. For example, when coating with a polyurea resin, the above (1)
The polyether polyamine of the above and the isocyanate prepolymer of the above (2) are weighed, regulated and heated by a proportioner and supplied to the inside of the spray gun. A spraying method is employed. In the case where the polyether polyamine of the above (1) and the polyisocyanate of the above component (2) are used and the reaction rate is relatively slow, mixing is performed by a stirring mixer or a static mixer as in the case of ordinary airless spray. After that, a method of spraying from a spray gun can also be adopted.

To prevent the polyurea resin film from adhering to the mold, a mold release agent such as soapy water, a silicone-based or fluorine-based compound is applied to the inner surface of the mold, or a mold release agent such as polyethylene or polypropylene is applied. It is preferable to perform a process such as attaching a film.

The epoxy resin and the polyurethane resin are generally coated with a solution obtained by dissolving the resin in an organic solvent by roller coating or spray coating.

The polyurea resin sprayed on the inner surface of the mold has a fast curing speed, and solidifies within a few seconds when the following polyamine (1) is reacted with the following polyisocyanate (2). (1) a polyamine containing a polyalkylene ether polyamine having an amino group bonded to a terminal secondary carbon atom of the polyalkylene ether; and (2) an isocyanate residue obtained by reacting an active hydrogen-containing compound with a polyisocyanate. Isocyanate prepolymers or mixtures of said isocyanate prepolymers and polyisocyanates.

When a polyurea resin film is formed, a polyurethane resin is immediately coated on the film. Next, when the polyurethane resin is in a dry state, it is coated with an epoxy resin. The drying time of the polyurethane resin is about 60 minutes, but the epoxy resin is preferably applied early.

In the present invention, in order to protect the polyurea resin film from sunlight and improve weather resistance, a film can be formed by applying a light-shielding paint. The coating amount of the light-shielding paint is usually about 50 to 500 g / m ² , and preferably about 100 to 300 g / m ² .

Examples of the light-shielding paint include oil-based paints,
Examples include alkyd resin paints, unsaturated polyester resin paints, urethane resin paints, acrylic resin paints, vinyl resin paints, etc. Among them, vinyl resin paints or non-yellowing urethane resins in terms of appearance stability and adhesion to polyurethane resin Paints are preferred. In order to further improve the light-shielding properties of light-shielding paints, powders of aluminum, zinc, iron, stainless steel, etc., carbon black, chrome oxide green,
It is particularly preferable to mix a powder having a particle size of 0.1 to 500 μm, such as titanium oxide and red iron oxide, and an ultraviolet absorber.

[0057]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments. (Example 1) Soap water was applied to the entire inner surface of an iron formwork for producing a deformed block for revetment and subjected to a mold release treatment. Immediately, a liquid A containing polyisocyanate as a main component and a liquid B containing polyamine as a main component, which has a gel time of 3 seconds and a tack-free time of 10 seconds, are sprayed onto the inner surface by an impingement mixing spray gun. A polyurea resin film obtained from the two solutions was formed. Time required for film formation is 20
Minutes. As a result of measurement using an electromagnetic film thickness meter, the coating amount was 1,000 g / m ^{2 as a} target, and the effective adhesion rate calculated from the relationship between the used amount of the two reactive liquids and the film thickness was 91%.

Then immediately, inside the coated formwork,
While vibrating, concrete was poured from the upper opening of the formwork, and filled and compacted for 1 hour. The vicinity of the opening (top end) of the deformed block was flattened with a metal iron, and the mold was disassembled the next day, and the formed deformed block was taken out. The two liquids were sprayed on the top with a collision mixing spray gun for 5 minutes to produce a deformed block whose entire surface was coated with a polyurea resin. The effective adhesion rate was 73%. The polyurea resin film was smooth and had a uniform film thickness.
The effective adhesion rate is a measure of waterproofness and anticorrosion. The higher the effective adhesion rate, the higher the waterproofness and anticorrosion. The results are shown in Table 1.

(Example 2) On the polyurea resin film formed in Example 1, immediately after coating, a one-component moisture-curable polyurethane solution was applied over the entire surface at an application amount of 150 g / m ² . One hour later, a mixture of an epoxy resin and a modified polyamidoamine was further applied on the entire surface at an application amount of 150 g / m ² . Next, concrete was poured into the inside of the coated form from the upper opening of the form while vibrating, and filled for 1 hour. A metal trowel was used near the opening of the deformed block. The next day, the mold was disassembled, and a moisture-curable one-component polyurethane solution was applied in an amount of 150 g / m ^2.
Was applied to the end face of the opening. One hour later, the liquid A containing polyisocyanate as a main component and the liquid B mainly containing a polyamine of Example 1 were sprayed on the end face of the opening by a collision-mixing spray gun for 5 minutes, and the entire surface was coated with a polyurea resin. A modified block was manufactured. The effective adhesion rate was 77%. The polyurea resin film was smooth and had a uniform film thickness.
The results are shown in Table 1.

(Comparative Example 1) Using the same formwork as in Example 1,
The top and side surfaces of the embankment shaped block with the inner surface of the mold not covered with resin were polished with a disk sander to remove latency and protrusions. With the crane suspended, apply an epoxy putty material to the entire bottom surface using a rubber spatula to suppress the formation of cavities and dents on the concrete surface and the occurrence of pinholes. Then, an epoxy putty material was similarly applied to the entire upper and side surfaces to cure and cure. Eighteen hours later, an impingement-mixing spray gun is used for the liquid A having polyisocyanate as a main component and the liquid B having polyamine as a main component, having a gel time of 3 seconds and a tack-free time of 10 seconds used in Example 1. Then, the irregular block was lifted by a crane and sprayed on the bottom surface. During spraying, the pinholes generated were overpainted to eliminate this. As a result of measurement using an ultrasonic film thickness meter, the film thickness of the overcoated portion was non-uniform, and the effective adhesion rate was 58% from the relationship between the used amount of the two reactive liquids and the film thickness. Due to the open system, material loss during spraying was large. The results are shown in Table 1.

Comparative Example 2 Using the same formwork as in Example 1,
The top and side surfaces of the embankment shaped block with the inner surface of the mold not covered with resin were polished with a disk sander to remove latency and protrusions. With the crane suspended, apply an epoxy putty material to the entire bottom surface using a rubber spatula to suppress the formation of cavities and dents on the concrete surface and the occurrence of pinholes. Then, an epoxy putty material was similarly applied to the entire upper and side surfaces to cure and cure. Next, the moisture-curable one-component urethane solution used in Example 2 was applied to the entire surface at a rate of 150 g per 1 m ² . One hour later, a solution A containing polyisocyanate as a main component and a solution B containing polyamine as a main component having a gel time of 3 seconds and a tack-free time of 10 seconds were sprayed on the surface by a collision mixing spray gun. . As a result of measurement using an ultrasonic film thickness meter, the film thickness was non-uniform as in Comparative Example 1, and the effective adhesion rate was 61% from the relationship between the amount of the reactive two liquid used and the film thickness. Due to the open system, material loss during spraying was large. The results are shown in Table 1.

[0062]

[Table 1]

[0063]

Since the deformed concrete block is covered with a polyurea resin film, it is excellent in waterproofness and corrosion resistance, and has a long service life as a seawall material. When the block is coated with a polyurea resin coating after being coated with an epoxy resin coating or a polyurethane resin coating, the block is more excellent in waterproofness and corrosion resistance. Further, since a coating such as a polyurea resin coating is formed by spray coating on the block molding form, then transferred to the block and coated with the block, manufacturing time and time are greatly reduced. And labor saving, and the work safety is high.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kentaro Kauchi 4-14-14 Nihonbashi Honcho, Chuo-ku, Tokyo F-term (reference) in San Techno Chemical Co., Ltd. 2D018 EA01 4G028 CA01 CB02 CC03 CD02 FA01 4G052 AB25 AC02

Claims (9)

[Claims] 1. A waterproof / corrosion-resistant deformed concrete block, wherein the deformed concrete block is coated with a polyurea resin. 2. The waterproof / corrosion-resistant deformed concrete block according to claim 1, wherein the deformed concrete block and the polyurea resin film are adhered to each other. 3. A waterproof / corrosion resistant deformed concrete block, wherein the deformed concrete block is sequentially coated with an epoxy resin, a polyurethane resin and a polyurea resin. 4. The waterproof / corrosion-resistant deformed concrete block according to claim 3, wherein the deformed concrete block and the epoxy resin film are adhered to each other. 5. The waterproof / corrosion-resistant deformed concrete block according to claim 3, wherein the epoxy resin film and the polyurethane resin film, and the polyurethane resin film and the polyurea resin film are adhered to each other. 6. The waterproof and anticorrosive composition according to claim 1, wherein the polyurea resin is obtained by reacting the following polyamine (1) with the following polyisocyanate (2). Sex deformed concrete block. (1) a polyamine containing a polyalkylene ether polyamine having an amino group bonded to a terminal secondary carbon atom of the polyalkylene ether; (2) an isocyanate residue obtained by reacting an active hydrogen-containing compound with a polyisocyanate Isocyanate prepolymers or mixtures of said isocyanate prepolymers and polyisocyanates. 7. A polyurea resin is coated on the inner surface of a deformed concrete block forming form, and ready-mixed concrete is poured therein.
The method for producing a waterproof / corrosion-resistant deformed concrete block according to claim 1 or 2, wherein the concrete is demolded after curing to form a block having a polyurea resin coating. 8. A polyurea resin is coated on the inner surface of the deformed concrete block molding form, and the cured coating is
After forming a polyurethane resin coating, on top of the dried multilayer coating, further form an epoxy resin coating, and after drying,
The method for producing a waterproof / corrosion-resistant deformed concrete block according to any one of claims 3 to 5, wherein the fresh concrete is poured, and after the concrete is hardened, the concrete is released from the mold and a block having a multilayer coating is formed. 9. The waterproofing device according to claim 7, wherein the polyurea resin is obtained by reacting a polyamine of the following (1) with a polyisocyanate of the following (2). -A method for producing a corrosion-resistant deformed concrete block. (1) a polyamine containing a polyalkylene ether polyamine having an amino group bonded to a terminal secondary carbon atom of the polyalkylene ether; (2) an isocyanate residue obtained by reacting an active hydrogen-containing compound with a polyisocyanate Isocyanate prepolymers or mixtures of said isocyanate prepolymers and polyisocyanates.