JP2596749B2 - Reinforced makeup method for old deteriorated surface - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for protecting and decorating a deteriorated wall surface, floor surface, etc. of a concrete building.

(Conventional technology) Conventionally, when repairing a deteriorated concrete body surface or a deteriorated undersized coating surface, firstly, a first sealer for the purpose of infiltrating and strengthening the deteriorated foundation, and then a second sealant for improving the adhesion with the waterproof topcoat A sealer was used for reinforcement of the undercoat, and then a finish was obtained by applying a paint for coloring or a multi-layer pattern finish coating material.

As described above, even in the case of simply changing the color of a deteriorated substrate, in the past, the undercoating alone generally relied on two steps and two types of paint.

(Problems to be Solved by the Invention) According to the conventional technology, a paint which also has an improved adhesion of a base reinforcing and topcoat paint and a waterproof property directly on a deteriorated concrete surface or a deteriorated decorative paint film surface as a base. Or there was no paint that could double as a top coat.

Also, in the case of a construction method using two or more general paints (including a base adjustment coating material), the construction period, materials, and labor tend to increase.

(Means for Solving the Problems) In the present invention, it is intended to provide a method of protection and makeup different from the conventional one using a novel material.

For this reason, as this coating composition, the component (A):
Water-soluble silicate represented by M ₂ O · xSiO ₂ · aq (where M represents an alkali metal belonging to Group 1A of the periodic table, x represents a positive value of 2.0 to 4.5, and aq represents an aqueous solution) A single aqueous solution or a mixed aqueous solution of two or more types. Component (B): The resin component is based on acrylic resins such as various acrylate copolymers, styrene / acrylate copolymers, and veova acrylate copolymers. A synthetic resin emulsion containing a carboxyl group (; -COOH) in the polymer composition of the resin, and an acid value of the resin in the range of 2 to 30; And / or a mixture of two or more water-soluble resin solutions, component (C): a water repellent or a waterproofing agent,
Component (D): A coating composition containing a pigment in the meaning of a combination of a coloring pigment and an extender, or a component (A), a component (B), a component (C), a component (D) and a component (E). ) Ingredient: A coating composition containing a solvent as a film-forming aid sufficient to form a film by drying as a whole as a coating composition is used.

The surroundings of the composition and the method are described in more detail below.

The concrete skeleton surface as a groundwork referred to in the present invention is a surface of a RC structure which has been finished without being subjected to a decorative finish and which has been finished only by application of a water-repellent agent or the like, which has deteriorated due to aging. Similarly, a deteriorated decorative paint surface is a building wall made of RC or PC,
A surface coated with a cement, synthetic resin emulsion, or synthetic resin finish coating material in the form of a yuzu skin or irregularities, and a surface on which the coating film of the finish coating material has deteriorated due to aging. Although there is no particular reason to designate a deteriorated underlayer in the present invention, it is rare that the paint is usually repainted as soon as new construction is completed.

Next, before the coating composition of the present invention is applied, it is the same as before, except for the rust prevention treatment of the rusted part, the repair of the chipped or cracked part, the removal of the fragile part, the cleaning, the high pressure water washing and the like. Prior processing is performed.

As the aqueous solution of the water-soluble silicate of the component (A), for example, commercially available Nippon Kagaku Kogyo Co., Ltd.
No. 3, No. 4, Sodium silicate No. 4, Potassium silicate A, 2K potash silicate,
Lithium silicate 30. Although there is silicate lithium 40 etc., it does not specify anything, and the general formula M ₂ O · xSiO ₂ · aq (where M represents Li, Na, K belonging to Group 1A of the periodic table, and x is 2.0
A positive value of ~ 4.5, aq indicates aqueous solution. ) May be used. The reason why the value of x in the formula is limited to the range of 2.0 to 4.5 is that a coating material having both good adhesion and good water resistance can be provided. If the value of x is less than 2.0, there is a slight problem in stability, and if the value of x is 4.6 or more, it is difficult to obtain continuous film properties, and the waterproof effect or the adhesion is poor.

Next, the synthetic resin emulsion and / or the synthetic resin solution of the component (B) will be described.

Selection of the resin includes various acrylic esters (eg, methyl ester, ethyl ester, butyl ester,
Ethyl hexyl ester, etc.), styrene-acrylate copolymer, veova acrylate copolymer-based acrylic resin. Carboxyl group as a functional group at the terminal or / and side chain of the resin It is preferable to have a high functionality in the range of 2 to 30 in terms of the acid value of the resin. The reason for the high functionality is that the resin can be stably mixed with the water-soluble silicate aqueous solution.
The acid value in this case is in the range of 2 to 30. If the acid value is less than 2, miscibility with the water-soluble silicate aqueous solution is poor, and agglomerates are formed. However, even if the miscibility is good, it is not preferable because the water resistance is slightly lowered. In addition, a carboxyl group (; -CO
OH), carbamoyl group (; -CONH ₂ ), epoxy group A vinyl group (; -CH = CH ₂₎ or the like acid value of the resin be contained no problem if the range of 2 to 30.

The synthetic resin emulsion or water-soluble resin which can be stably mixed with the aqueous solution of a water-soluble silicate referred to in the present invention comprises a hydrophilic monomer such as an acrylate or a methacrylate, which has a high hydrophobicity such as an acrylate having a large C number, styrene or the like. 2-12 mol% in the synthetic resin emulsion with respect to the monomer,
In the case of a water-soluble resin, it is obtained by introducing 13 to 20 mol%. Examples of such a synthetic resin emulsion include AC-604 manufactured by Rohm & Haas Co., Ltd., Movinyl 975 manufactured by Hoechst Gosei Co., Ltd., and Boncart A manufactured by Dainippon Ink and Chemicals, Inc.
W-7228, and the water-soluble resin includes Watersol S-701 manufactured by Dainippon Ink and Chemicals, Inc.

As the water repellent and waterproofing agent of the component (C), there are silicone emulsion type, metal soap type, petroleum wax type, etc., and Sepal # 380 manufactured by Chukyo Yushi Co., Ltd., Polon C manufactured by Shin-Etsu Chemical Co., Ltd. Aqua Seal manufactured by Iron and Steel Chemical Industry Co., Ltd.

Examples of the component (D) include white pigments such as titanium oxide, zinc oxide, and lithopone; carbon black, red iron oxide, graphite, chromium oxide, phthalocyanine blue, phthalocyanine green, ultramarine, and toluidine red. Extenders such as coloring pigments, heavy calcium carbonate, talc, clay, and silica powder;

When the minimum film forming temperature of the coating composition is 0 ° C. or higher without the component (E), the film forming aid of the component (E) may be methylcellosolve, carbitol, triethylene glycol, texanol, or the like. The solvent is preferably added in an amount not exceeding 30% by weight based on the synthetic resin emulsion. In the case of a synthetic resin emulsion having a minimum film-forming temperature of 0 ° C. or lower, a solvent may not be added, but it may be added in consideration of improvement in frozen storage stability and coating workability at the time of coating. The reason why the addition amount of the solvent does not exceed 30% by weight is that if too much is added, the drying property deteriorates. Preferably 5 to 15 for the synthetic resin emulsion
It is the amount of addition by weight.

The ratio of the component (A) to the component (B) is suitably solid ratio (A) solid content: (B) solid content = 10: 1 to 1:30. When this is (A) :( B) = 10: 1 or less, the water resistance of the coating film is deteriorated. On the contrary, when (A) :( B) = 1: 30 or more, adhesion to chalks or a highly deteriorated substrate is observed. Gets worse.

(Operation) As described above, the coating composition of the present invention has an action of deeply penetrating and strengthening a deteriorated concrete surface or a deteriorated decorative coating film surface. In addition, if the PVC of the paint is increased, it can be used as a repair material. The intrusion of water from outside is restricted by including a water repellent or a waterproofing agent in the paint component.

(Example) Example 1 After the exterior wall 10 years after the finish was made with RC construction and exterior thin coating material E (Risin), high pressure water washing was performed as a pretreatment, and then 200 g of the coating composition was prepared according to the following composition. / m ²
To the extent, it was painted with a roller. After 6 months, the painted wall has no abnormal appearance and no accident such as peeling has occurred.

Formulation 1 Raw material Formulation amount Sodium silicate No. 3 80 parts by weight Boncoat AW-7228 (synthetic resin emulsion manufactured by Dainippon Ink and Chemicals, NV = 45%) 40 parts by weight Water repellent [manufactured by Chukyo Yushi Co., Ltd. , AS-02] 2 parts by weight Titanium oxide 15 parts by weight Iron black 1 part by weight Yellow iron oxide 2 parts by weight Silica fine powder 40 parts by weight Water 18 parts by weight Additives (thickener, defoaming agent, etc.) 2 parts by weight 1 paint on commercial PC board, 15cm × 15cm × 5cm
Was coated with a roller, and the water permeability and water resistance of the coated surface and a heating / cooling repetition test were conducted in accordance with the method of JIS A 6910. The water permeability was 2 ml. No abnormalities occurred in the repeated test.

In addition, water repellency is maintained even after irradiation for 500 hours with a sunshine weatherometer as an accelerated weather resistance test, preventing water from entering the inside of the frame by water repellency, protecting the reinforcing steel from water, and having an indirect rust prevention effect Was something.

Example 2 A deteriorated concrete block was subjected to high-pressure water washing as a pretreatment, and then a coating composition having the following composition was used.
Paint about 150 g / m ^{2 with} a spray gun, dry at room temperature for 4 hours, then in a multi-layered finish coating material specified in JIS A 6910, a synthetic resin emulsion-based material and an acrylic resin-based synthetic resin solution one day later With enamel.

Then, when the adhesive strength was measured after one week at room temperature, the adhesive strength was 16.5 kg / cm ² , and the exfoliated portion was ground concrete. It was also found that the coating film was good and had good water resistance even after immersion in normal temperature water for 10 days.

Blending 2 Raw material Blending amount J sodium silicate No. 3 [Nippon Kagaku Kogyo Co., Ltd., NV = 38.5
%] 80 parts by weight Primal AC-604 20 parts by weight (Rohm & Haas Synthetic Resin Emulsion NV = 46.0
%) Water repellent [Polon C, manufactured by Shin-Etsu Chemical Co., Ltd.] 5 parts by weight Titanium oxide 30 parts by weight Heavy calcium carbonate 30 parts by weight Methyl cellosolve 2 parts by weight Water 32 parts by weight Additives (thickener, defoamer) 1 part by weight Comparative Example 1 The deteriorated concrete block was subjected to high-pressure water washing as a pretreatment, then permeated with lithium silicate solution and dried at room temperature for 24 hours, and then treated with an acrylic resin emulsion-based sealer at room temperature. It was dried for 4 hours, and was coated with a synthetic resin emulsion-based main material and one day later with an enamel of an acrylic resin-based synthetic resin solution in a multilayer finish coating material specified in JIS A 6910. When the adhesive strength was measured after one week at room temperature, the adhesive strength was 15.4 kg / cm ² , and the peeled portion was concrete. Also, when immersed in room temperature water for 10 days, swelling was supposed to occur from the interface between the lithium silicate and the acrylic resin emulsion sealer after 2 days. This means that the decorative paint film is damaged by rainwater or the like, and it can be said that it is impractical in a rainy area.

Comparative Example 2 A 15 cm x 15 cm x 5 cm commercially available PC board was first coated with a permeable one-pack type urethane sealer, dried at room temperature for 12 hours, coated with an acrylic resin-based solvent-type sealer, dried at room temperature for 2 hours, and then painted as a finish. Painted. Water permeation and waterproofness of the coated surface, and repeated heating and cooling tests according to the method of JIS A 6910, the amount of water permeation was 1.5 ml, water resistance, and the results of the repeated heating and cooling tests showed no abnormalities . Here, compared with Experimental Example 2, in the embodiment, the underlayer reinforcement, the waterproof coating film, and the decorative coating film can be formed in one step, and the time required for the construction is very short, and the coating film performance is sufficiently good. On the other hand, in Comparative Example 2, although the coating film performance was good, three steps were required, and the time required for construction was very long, and this difference was very large. It can be said.

(Effect of the Invention) According to the method for enhancing makeup of an old deteriorated surface of the present invention, it is possible not only to enhance the penetration than the deteriorated surface, but also to provide a water-repellent, waterproof and water-resistant cosmetic surface or a waterproof finish coating material. Can provide a primer surface. In addition, the composition is highly alkaline,
It also has the effect of preventing the neutralization of concrete, so it gives a good quality undercoat in renovation work. Also waterproof agent,
Due to the effect of the water repellent, the durability of water resistance is extremely good and the practicability is high as compared with the conventional silicate-based primer.

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-62333 (JP, A) JP-A-55-67590 (JP, A) JP-A-55-60081 (JP, A)

Claims (3)

(57) [Claims] In a concrete building protection and decorative construction method, a general formula M ₂ O.xSiO ₂ .aq (where M is the periodic table
X represents a positive value of 2.0 to 4.5, and aq represents an aqueous solution. ) Or a mixed aqueous solution of two or more water-soluble silicates (A) and a resin component composed of various acrylate ester copolymers, styrene / acrylate ester copolymers, veoba acrylate ester copolymers, etc. A single or a mixture of two or more selected from those based on acrylic resin,
The resin composition contains a carboxyl group (; -COOH) and further has an acid value of the resin in the range of 2 to 30. A synthetic resin emulsion or / and a water-soluble resin solution alone or as a mixture of two or more (B ), A coating composition containing a water repellent or waterproofing agent (C) and a pigment (D) is applied to the outer surface of a deteriorated building. 2. In a concrete building protection and decorative method, a general formula M ₂ O.xSiO ₂ .aq (where M is the periodic table
X represents a positive value of 2.0 to 4.5, and aq represents an aqueous solution. ) Or a mixed aqueous solution of two or more water-soluble silicates (A) and a resin component composed of various acrylate ester copolymers, styrene / acrylate ester copolymers, veoba acrylate ester copolymers, etc. A single or a mixture of two or more selected from those based on acrylic resin,
The resin composition contains a carboxyl group (; -COOH) and further has an acid value of the resin in the range of 2 to 30. A synthetic resin emulsion or / and a water-soluble resin solution alone or as a mixture of two or more (B ), A coating composition containing a water repellent or waterproofing agent (C), a pigment (D) and a solvent (E) as a film-forming aid is applied to the outer surface of a deteriorated building. Surface enhancement makeup method. 3. The composition ratio of the water-soluble silicate (A) and the component (B) is a solid content ratio of (A) :( B) = 10: 1 to 1:30.
The method for enhancing makeup of an old deteriorated surface according to claim 1 or 2, characterized in that: