JPH10204373A - Coating liquid for secondary coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating liq. that is excellent in applicability and can form a secondary coating without being affected by water, etc. SOLUTION: This coating liq. comprises the first liq. contg. a cold-curable epoxy resin and the second liq. contg. a curing agent therefor. Examples of the epoxy resin are a bisphenol epoxy resin (e.g. one based on bisphenol A or F) and a urethane- or polysulfide-modified epoxy resin. The curing agent is selected from among aliph. polyamines (e.g. m-xylenediamine, isophoronediamine, and polyethylenepolyamine), heterocyclic polyamines, arom. polyamines (e.g. diaminodiphenylmethane), and epoxy modifications of these amines.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating liquid used for applying secondary lining to a shield tunnel or the like.

[0002]

2. Description of the Related Art Conventionally, in constructing a shield tunnel, a primary lining is conventionally performed with a prefabricated structure using segments, and concrete is cast as a finish which also serves as reinforcement, corrosion protection, meandering correction, waterproofing, and the like. Secondary lining. It has been pointed out that the secondary lining with concrete requires excavation of a tunnel larger than necessary, resulting in an increase in the amount of sediment discharged and the amount of concrete used, and a problem that drying takes a long time. .

[0003] On the other hand, attempts have been made to solve the above problems. For example, a secondary lining material using a polyurethane-based or other synthetic resin material instead of concrete has been proposed. According to the secondary lining material, although the above-mentioned problems caused by the concrete secondary lining material are improved, the polyurethane secondary lining material has high reactivity with water due to the use of the isocyanate component, When used on a wet surface, there is a disadvantage that the curing of the resin component does not proceed sufficiently.

[0004]

An object of the present invention is to provide a coating liquid capable of forming a secondary lining excellent in workability without being affected by moisture or the like. The task to be done.

[0005]

The coating liquid for secondary lining according to the present invention comprises a first liquid containing a cold-setting epoxy resin component and a second liquid containing the curing agent component. It is characterized by.

The epoxy resin component is preferably a urethane-modified epoxy resin or a polysulfide-modified epoxy resin. The first liquid preferably contains an elasticity-imparting component such as a reactive diluent or a non-reactive diluent.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below.

[0008] The coating solution for secondary lining according to the present invention is preferably applied after the surface of the primary lining applied to the shield tunnel is subjected to a normal pretreatment such as sander, sandblasting or the like. There is no particular limitation on the primary lining, and a prefabricated structure of the segments may be used.

In the coating liquid of the present invention, the epoxy resin to be blended in the first liquid can be arbitrarily selected from those commonly used as room-temperature-curable epoxy resin compositions. For example, bisphenol type epoxy resins such as bisphenol A type and bisphenol F type, and modified epoxy resins modified with urethane, polysulfide and the like are used. These epoxy resins may be used alone or as a mixture of two or more.

The first liquid may contain, if necessary, a reactive diluent such as glycidyl ether, glycidyl ester, glycidylamine, chain aliphatic epoxide, or alicyclic epoxide, benzyl alcohol, nonylphenol, butyldiglycol, dioctyl. Phthalate, non-reactive diluents such as dibutyl phthalate, a small amount of toluene, xylene,
Solvents such as ketones and alcohols, extenders such as silica, talc, calcium carbonate and barium sulfate, various coloring pigments, and water can be blended. The maximum blending amount of these in the first liquid is preferably 40% for the reactive diluent, 30% for the non-reactive diluent, 60% for the extender, and 30% for the color pigment.

[0011] The secondary lining is an expansion of the primary lining segment,
It is required to follow shrinkage, and therefore, the epoxy composition constituting the secondary lining preferably has elasticity (flexibility). As a method of imparting elasticity to the epoxy resin composition, a method using an epoxy resin modified with urethane or polysulfide, polyethylene glycol diglycidyl ether, a bifunctional long-chain reactive diluent such as polypropylene glycol diglycidyl ether or Examples include a method using a non-reactive diluent such as dioctyl phthalate and dibutyl phthalate, a method using a polyamidoamine having a small amine value, a urethane-modified amine, an alkylamine, a hexamethylenediamine-modified product, and a mercaptan-based curing agent. it can. Further, if necessary, an elasticity-imparting component such as an acrylic resin or an acrylic resin emulsion may be used.

[0012] The curing agent component blended in the second liquid includes those conventionally used as curing agents for cold-setting epoxy resin compositions, for example, aliphatic polyamines such as meta-xylene diamine, isophorone diamine, and polyethylene polyamine; It can be arbitrarily selected from aromatic polyamines such as heterocyclic polyamines and diaminodiphenylmethane, and amines obtained by modifying these with epoxy. These curing agents may be used alone or as a mixture of two or more. In addition, if necessary, a curing accelerator such as phenol, bisphenol A, salicylic acid, tris (dimethylaminomethyl) phenol, a non-reactive diluent incorporated in the first liquid, a small amount of a solvent, an extender, a coloring pigment And water may be blended. These maximum loadings in the second liquid are 10% for the curing accelerator and 30% for the non-reactive diluent.
%, 60% for the extender pigment, and 30% for the color pigment.

The first liquid and the second liquid are mixed by a mixing means such as an electric stirrer or a static mixer, and then spray-coated. The mixing amount of the second liquid with respect to the first liquid is an amount sufficient to cure the epoxy resin composition mixed in the first liquid, and the ratio of the first liquid and the second liquid is generally 1: 1:
It is about 1 to 5: 1.

When the secondary lining of the tunnel is performed by using the coating liquid of the present invention, if necessary, the primary lining surface is coated with a primer or epoxy resin for improving the adhesion to the base with an epoxy-based paint. May be coated with a putty material and a base material.

The primer may be either a one-pack type epoxy paint or a two-pack type epoxy paint. Water, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, acetone, ethyl acetate, butyl acetate, methyl glycol acetate, ethyl glycol acetate May be used after being diluted with a solvent such as

As the one-pack type epoxy paint, for example, an epoxy paint containing ketimine is used. Further, as an example of a two-pack type epoxy coating, a cold-curable bisphenol-type epoxy resin is generally used as the first liquid, and a meta-xylenediamine commonly used as a cold-setting epoxy resin curing agent is used as the second liquid. And aliphatic polyamines such as isophorone diamine and polyethylene polyamine, heterocyclic polyamines, diaminodiphenylmethane and the like. In addition to the above components, additives such as extender pigments, coloring pigments, and modifiers commonly used in ordinary epoxy paints can be added to the epoxy paint for primer.

As the putty material and the base material, a two-pack type epoxy resin composition is used, and a bisphenol epoxy resin such as bisphenol A type or bisphenol F type or an epoxy resin modified with urethane or polysulfide is used as a main component. And a second liquid containing a curing agent of a room temperature-curable epoxy resin composition as a main component. It is preferable that these putty materials and the base material include the above-described epoxy resin component having elasticity, and may further include additives such as extender pigments, color pigments, and modifiers.

The primer, the putty material, and the base material are applied to a desired film thickness with a coating tool such as a brush, a roller, an airless coating machine, and a spatula. In addition, it is also desirable to adhere a glass cloth or a carbon cloth to the putty material to prevent moisture from entering and improve the strength of the coating film.

In this manner, the secondary coating is formed by the coating film having a thickness of 1 to 10 mm mainly composed of the epoxy resin composition, and the coating film has a wet adhesion strength to the concrete segment as the primary coating. 15kgf / cm
Concrete breaks at ² or more, coating strength (Shore D hardness) is 40 or more, impact resistance is 50 kg-cm or more, abrasion resistance is 80 mg or less, water permeability is 0.01 g or less, and back pressure test It shows that there is no abnormalities, and it shows impact resistance, abrasion resistance and water impermeability more than the conventional secondary lining with concrete.

[0020]

Next, the present invention will be described in detail with reference to examples.

[Execution of secondary lining] Example 1 After the primary lining of a circular prefabricated structure using a concrete segment in a shield tunnel, the surface was washed with water and the surface moisture was wiped off with a rag or the like. The first liquid and the second liquid of the primer having the composition shown in Table 1 were mixed at a weight ratio of 1: 1. After coating with a roller brush, the first liquid and the second liquid of the base conditioner having the composition shown in Table 2 were immediately obtained. And aggregate in weight ratio of 4.
Mix at a ratio of 3: 0.7: 8.0 and spray 1kg
/ M ² .

[0022]

[Table 1] (Water-based primer) Component composition Composition ratio First liquid epoxy resin emulsion 100 Second liquid modified polyamidoamine 25 Water 75

[0023]

[Table 2] (Elastic type base material) Component composition Composition ratio First liquid epoxy resin emulsion 20 Acrylic resin emulsion 80 Second liquid modified polyamidoamine 25 Water 75 Aggregate Portland cement 50 Silica sand 50

One day after the application of the base material, the first liquid and the second liquid of the putty material shown in Table 3 were mixed at room temperature (20 ° C.) at a weight ratio of 1: 1 to obtain 0.5 kg / m ^2. Paint with a rubber spatula so that it becomes a glass cloth while removing air bubbles.
0 was pasted. Next, a filling of 0.8 kg / m ² was performed with the same paint. After curing at room temperature (20 ° C.) for one day, 0.4 kg of the elastic epoxy resin composition (top coat) shown in Table 4 was applied.
/ M ² to obtain a smooth and uniform coating film without sagging or unevenness. FIG. 1 is a cross-sectional view of the coating film, and the thickness of the entire coating film was about 1.5 mm.

[0025]

[Table 3] (Putty material) Composition ratio First liquid bisphenol A type epoxy resin 40 Polyethylene glycol diglycidyl ether 20 Calcium carbonate 30 Rutile type titanium oxide 5 Carbon 0.1 Additive (inorganic thixotropic agent) 4 .9 second liquid meta-xylene diamine epoxy modified product 15 polyamidoamine 15 benzyl alcohol 15 calcium carbonate 45 titanium oxide 5 additive (inorganic thixotropic agent) 5

[0026]

(Table 4) (Top coating) Component composition Composition ratio First liquid Bisphenol A type epoxy resin 50 Polyethylene glycol diglycidyl ether 25 Precipitable barium sulfate 10 Rutile type titanium oxide 4.6 Carbon 0.1 Additive (inorganic type 5) Additive (antifoaming agent) 0.3 Second liquid meta-xylene diamine epoxy modified product 50 Benzyl alcohol 10 Talc 35 Titanium oxide 3 Additive (inorganic thixotropic agent) 2

Example 2 After the same primary lining as in Example 1 was applied, the surface was washed with water and the surface was wiped off with a rag, and then the first and second solvent-based primers shown in Table 5 were used. The liquids were mixed at a weight ratio of 1: 1 and painted with a roller brush. Next, the first liquid, the second liquid, and the aggregate of the base material shown in Table 6 were used in a weight ratio of 3.
The mixture was mixed at a ratio of 3: 0.7: 8.0 and spray-coated so as to be 1 kg / m ² .

[0028]

[Table 5] (Solvent-based primer) Component composition Composition ratio First liquid bisphenol A type epoxy resin 50 (Epoxy equivalent: about 450) Xylene 25 Normal butanol 25 Second liquid modified polyamidoamine 50 Xylene 25 Normal butanol 25

[0029]

[Table 6] (Elastic type base material) Component composition Composition ratio First liquid epoxy resin emulsion 20 Acrylic resin emulsion 80 Second liquid modified aliphatic polyamine 25 Water 75 Aggregate Portland cement 50 Silica sand 50

One day after the application of the base material, the first liquid and the second liquid of the putty material shown in Table 7 were mixed at a room temperature (20 ° C.) at a weight ratio of 1: 1 and 0.5 kg / after construction in a rubber spatula so that m ^2, while unplug the air bubbles, glass cloth # 2
30 was pasted. Next, with the same paint, 1.0 kg / m ²
Was stopped by. After curing at room temperature (20 ° C.) for one day, the polysulfide-modified elastic epoxy resin composition (top coating) shown in Table 8 was applied at 0.6 kg / m ² to obtain a smooth and uniform coating film without sagging or unevenness. . The thickness of the entire coating is about 2mm
Met.

[0031]

TABLE 7 (putty) Ingredient pair formation ratio first liquid polysulfide-modified epoxy resin 40 Polyethylene glycol diglycidyl ether 20 Calcium carbonate 30 rutile titanium oxide 5 Carbon 0.1 additive (inorganic thixotrope) 4. 9 Second liquid meta-xylene diamine epoxy modified product 15 Polyamide amine 15 Benzyl alcohol 15 Calcium carbonate 45 Titanium oxide 5 Additive (inorganic thixotropic agent) 5

[0032]

TABLE 8 (top coating) Ingredient pair formation ratio first liquid polysulfide-modified epoxy resin 50 Polyethylene glycol diglycidyl ether 25 precipitated barium sulfate 10 rutile titanium oxide 4.6 Carbon 0.1 additive (inorganic thixotropic 5) Additive (antifoaming agent) 0.3 Second liquid meta-xylenediamine epoxy modified product 55 Benzyl alcohol 5 Talc 35 Titanium oxide 3 Additive (inorganic thixotropic agent) 2

Example 3 The procedure of Example 2 was repeated, except that the urethane-modified elastic epoxy resin composition shown in Table 9 was applied at 0.6 kg / m ² as an overcoating material. A smooth and uniform secondary coating film was obtained.

[0034]

[Table 9] (Urethane-modified elastic epoxy paint) Composition ratio First liquid urethane-modified epoxy resin 50 Polyethylene glycol diglycidyl ether 25 Precipitable barium sulfate 10 Rutile type titanium oxide 4.6 Carbon 0.1 Additive (inorganic) System thixotropic agent) 5 Additive (antifoaming agent) 0.3 Second liquid metaxylenediamine epoxy modified product 55 Benzyl alcohol 5 Talc 35 Titanium oxide 3 Additive (inorganic thixotropic agent) 2

Comparative Example 1 On a mortar board conforming to JIS R 5201, a cement obtained by mixing Portland cement, Toyoura standard sand and water at a ratio of 520: 1040: 338 was applied so as to have a thickness of 40 mm. C) for 28 days.

Comparative Example 2 After the same primary lining as in Example 1 was applied, the surface was washed with water and the surface was wiped off with a rag, and then the first and second liquids of the urethane paint shown in Table 10 were obtained. Was mixed at a weight ratio of 1: 1 and applied with a roller brush to a coating thickness of 1.5 mm to obtain a smooth and uniform coating film.

[0037]

[Table 10] (Urethane paint) Component composition Ratio 1st liquid 3,3'-dichloro-4,4'-diaminophenylmethane modified product 45 dioctyl phthalate 15 silica 35 rutile type titanium oxide 4.8 carbon 0.1 Silicone defoamer 0.1 Second liquid modified tolylene diisocyanate 100

Comparative Example 3 After the same primary lining as in Example 1 was applied, the surface was washed with water and the surface was wiped off with a waste cloth. The solution was mixed at a weight ratio of 100: 2, and 0.15 kg /
It was painted in such a way as to provide in m ^2.

[0039]

[Table 11] (Polyester resin primer) Component composition Composition ratio First liquid unsaturated polyester resin liquid (containing catalyst) 100 Second liquid organic peroxide 100

After the primer has cured after 6 hours,
At room temperature (20 ° C.), the first liquid and the second liquid of the putty material shown in Table 12 were mixed at a weight ratio of 100: 1.5, and the mixture was coated with a rubber spatula to 1.0 kg / m ² .

[0041]

Table 12 (polyester resin putty) Ingredient pair formation ratio first liquid unsaturated polyester resin solution (catalyst-containing) 50 Talc 50 second liquid organic peroxides 100

After the putty material has been cured after 6 hours, the first liquid and the second liquid of the polyester resin shown in Table 13 are mixed at a room temperature (20 ° C.) in a weight ratio of 100: 2, and 0.5 kg / m 2. ^Two
Was painted with a roller brush. Thereafter, a glass mat # 450 (450 g / m ² ) was stuck so as to prevent wrinkles. Next, the polyester resin paint prepared as described above was applied so as to be 0.6 kg / m ² while removing bubbles with a defoaming roller. One day later, after the polyester resin was cured, the mixed and prepared polyester resin paint was applied again with a roller brush so as to be 0.2 kg / m ² to obtain a smooth and uniform coating film.

[0043]

[Table 13] (Polyester resin) Component composition Ratio First liquid Unsaturated polyester resin liquid (containing catalyst) 100 Second liquid Organic peroxide 100

Comparative Example 4 After the same primary lining as in Example 1 was applied, the surface was washed with water and the surface was wiped off with a rag, and then the first liquid of the high-strength resin mortar shown in Table 14 was prepared. The two liquids and the aggregate were mixed at a weight ratio of 2: 1: 6, and coated with a trowel so as to have a coating thickness of 3.0 mm to obtain a smooth and uniform coating film.

[0045]

[Table 14] (high-strength resin mortar) Ingredient pair formation ratio first liquid bisphenol A type epoxy resin 80 alkyl (C12-13) glycidyl ether 18 additive (inorganic thixotropic agent) 1.7 additives (defoaming 0.3) second liquid metaxylenediamine epoxy modified product 55 polyamidoamine 30 benzyl alcohol 15 aggregate silica sand 100

[Performance Test of Secondary Coating Film] Test (1) After the coating films obtained in Examples 1 to 3 and Comparative Examples 2 to 4 were cured (one week), they were bonded to a wet surface. The test was conducted by a Kenken-type tensile test. The test results are shown in Table 15, and the meanings of the symbols in the table are as follows. Numerical values in parentheses indicate adhesive strength. ○ ・ ・ ・ Concrete cohesive failure × ・ ・ ・ Interfacial peeling of coating film surface

Next, in order to carry out the following strength test, JI
The same coating film as in the above Examples and Comparative Examples was formed on a mortar plate based on SR 5201, and tested one week later. Table 15 also shows the results.

Test (2) A DuPont impact test was performed according to JIS K5400. The meanings of the symbols in Table 15 are as follows. ○ ・ ・ ・ No abnormality × ・ ・ ・ Crack generation

Test (3) The coating film hardness (Shore D) was measured according to JIS K 7215.

Test (4) A taper wear test was performed according to JIS K 5400.

Test (5) A water permeability test was performed according to JIS A1404. The test body used was one in which each paint was applied on a mortar plate formed into a size of 150 mmφ × 40 mm and cured at 20 ° C. for 28 days. The values in Table 15 indicate the amount of water permeation at 3 kg / cm ² · 1 hr.

Test (6) A back pressure test was performed in accordance with JIS A1404. 10mm
Using a flexible board having a hole of φ, a water pressure of 1 kg / cm ² was applied from the back, and the change of the coating film after one day was observed. The meanings of the symbols in Table 15 are as follows. ○ ・ ・ ・ No abnormality × ・ ・ ・ Destruction of coating film

[0053]

[Table 15] Tests (1) (2) (3) (4) (5) (6) ( kg / cm ² ) mg g Example 1 ○ (23) ○ 50 80 0.01 ○ Example 2 ○ (24) ○ 47 85 0.01 ○ Example 3 ○ (22) ○ 45 88 0.01 ○ Comparative Example 1 − (−) × − 600 15 − Comparative Example 2 × (−) ○ 50 100 0.01 ○ Comparative Example 3 × (−) ○ 80 100 0.00 ○ Comparative Example 4 ○ (25) × 90 75 0.00 ○

[0054]

The coating liquid of the present invention is different from resin lining materials such as urethane-based or polyester-based coatings in that it has excellent workability, is not affected by moisture, etc., and is used for secondary lining on shield tunnels and the like. Can be formed. Moreover, the formed coating film has a strength performance equal to or higher than that of conventional concrete even with a thin film thickness of 1 to 10 mm.

[Brief description of the drawings]

FIG. 1 is a sectional view of a secondary lining using a coating liquid of the present invention.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masahiro Endo 1-1-1 Tomie-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Inside the Kumagaya Gumi Yokohama Branch (72) Inventor Shunji 1-1-1, Fujiya-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Inside the Kumagaya Gumi Yokohama Branch (72) Inventor Yoshiyuki Kawamura 2-1 Tsukudocho, Shinjuku-ku, Tokyo Headquarters, Inc. Kumagai Gumi Tokyo Head Office (72) Inventor Tatsuya Okamoto 2-1 Tsukudocho, Shinjuku-ku, Tokyo Co., Ltd. Kumagai Gumi Tokyo Head Office (72) Inventor Kozo Takemura 1-1-1 Okubo, Shinjuku-ku, Tokyo Nisshin Waterproofing Co., Ltd. (72) Inventor Takashi Suda 1778 Owase Sezaki, Miwa-cho, Sarushima-gun, Ibaraki Pref. Material Industry Co., Ltd.

Claims (3)

[Claims] 1. A coating liquid for secondary lining comprising a first liquid containing a cold-setting epoxy resin component and a second liquid containing the curing agent component. 2. The coating solution for a secondary coating according to claim 1, wherein the epoxy resin component is a urethane-modified epoxy resin or a polysulfide-modified epoxy resin. 3. The coating solution for secondary lining according to claim 1, wherein an elasticity-imparting component is blended with the first liquid.