JP5193156B2 - Composition for surface modification of calcium-based inorganic substrate - Google Patents

Description

  The present invention relates to a surface modification composition for a calcium-based inorganic substrate and a surface modification kit for a calcium-based inorganic substrate.

  Products made of calcium-based inorganic base materials such as concrete, cement, gypsum, and stone used for building materials and buildings are subject to deterioration due to weathering, dirt due to moss, etc., or wear, cracking, and peeling due to aging. As a method for repairing the base material thus deteriorated, if the deterioration is slight, a method of applying paint such as paint on the surface of the base material to color it and making cracks or the like inconspicuous can be mentioned. However, although paints such as paint are easy to handle, they are brittle and easy to peel off, so cracking and peeling will be noticeable in a short period of time.

  For the purpose of coloring the substrate itself in addition to the paint, for example, Patent Document 1 discloses a coating composition containing a water-soluble alkali silicate compound and a pigment, and Patent Document 2 discloses dyes, water-soluble substances. A method for coloring a concrete substrate using a coating composition containing an alkali silicate compound and an aqueous solvent is disclosed. However, since these compositions penetrate into the base material, cracks on the surface of the base material cannot be sufficiently hidden.

  In addition, a method of coloring using an organic solvent-based or water-based paint mainly composed of a resin is also performed. When this method is used, it is possible to hide cracks on the surface of the substrate. However, since the concrete base material itself is not colored but only the colored coating film is adhered to the surface of the concrete base material, the coating film is easily peeled off from the adhesive surface. Furthermore, organic solvent-based paints are not so preferable in consideration of environmental aspects.

  On the other hand, when the deterioration is serious, it is necessary to reconstruct with concrete again. However, when reconstructing with concrete or the like, the work is complicated and skillful techniques are required, which cannot be easily performed by ordinary people. Even if it is further constructed, it will crack and peel again due to deterioration.

Japanese Patent Laid-Open No. 2002-211988 Japanese Patent Laid-Open No. 2002-179952

  The object of the present invention is to easily repair the surface of an aged calcium-based inorganic base material such as deterioration due to weathering, dirt due to moss, wear, cracks, peeling, etc., and the surface after repair is excellent An object of the present invention is to provide a composition for modifying the surface of a calcium-based inorganic base material that has strength, water resistance, and weather resistance and that can be applied in any thickness.

  The present invention relates to a composition for surface modification of a calcium-based inorganic base material, comprising a resin having a silanol group or a group that can be converted into a silanol group, a water-soluble alkali silicate compound, and at least one of silica sand and calcium carbonate. Offer things.

  In one embodiment, the surface modifying composition contains both the silica sand and the calcium carbonate.

  In one embodiment, the surface modifying composition further contains a color pigment.

  Furthermore, the present invention provides a surface modification kit for a calcium-based inorganic base material, and the kit includes a liquid composition containing a resin having a silanol group or a group that can be converted into a silanol group, and a water-soluble alkali silicate compound. And a powdered composition containing at least one of silica sand and calcium carbonate.

  In one embodiment, the powdered composition contains both the silica sand and the calcium carbonate.

  In one embodiment, the kit further contains a color pigment, or at least one of the liquid composition and the powdery composition contains a color pigment.

  According to the present invention, it is possible to easily repair the surface of an aged calcium-based inorganic base material such as deterioration due to weathering, dirt due to moss, abrasion, cracking, peeling, and the surface after repair is excellent. Has strength, water resistance, and weather resistance. Furthermore, the surface modifying composition of the present invention can be applied to a substrate with an arbitrary thickness.

(Composition for surface modification of calcium-based inorganic substrate)
The calcium-based inorganic base material surface modification composition of the present invention (hereinafter sometimes simply referred to as “surface modification composition”) is a resin having a silanol group or a group that can be converted into a silanol group ( Hereinafter, it may be simply referred to as “silanol resin”), a water-soluble alkali silicate compound, and at least one of silica sand and calcium carbonate. In addition, in the present specification, the “calcium-based inorganic base material” means a base material made of concrete, cement, gypsum, stone, etc., for example, aggregate (sand, gravel, etc.) is a calcium-based inorganic substance, It also refers to a base material made of asphalt concrete (ascone) in which the binder is asphalt.

  The silanol resin used in the composition for surface modification of the present invention is not particularly limited as long as it is a resin having a silanol group or a group that can be converted into a silanol group. Examples of silanol resins include acrylic resins and styrene-acrylic resins.

  Examples of the group that can be converted into a silanol group include groups in which the hydroxyl portion of the silanol group is an alkoxy group, a halogen group or the like (these can be converted into a hydroxyl group by hydrolysis or the like). Furthermore, resins such as acrylic resins and styrene-acrylic resins preferably contain a carboxyl group.

  Such a silanol resin is used, for example, in the form of an emulsion, or in a state dissolved or dispersed in a solvent, preferably in the form of an aqueous emulsion.

  Only one type of silanol resin may be used, or two or more types may be used in combination.

The water-soluble alkali silicate compound used in the surface modification composition of the present invention is not particularly limited as long as it is a water-soluble alkali silicate compound. Such a compound is generally represented by M ₂ O · nSiO ₂ (M is an alkali metal, and n is an integer of usually 2 to 4). Examples of the water-soluble alkali silicate compound include sodium silicate (sodium orthosilicate, sodium sesquisilicate, sodium metasilicate, etc.), lithium silicate, potassium silicate, and the like. Of these, sodium silicate represented by Na ₂ O.3SiO ₂ is preferably used.

  The water-soluble alkali silicate compound forms an insoluble silicate compound by reaction with a polyvalent metal ion or by removing the alkali component (M) of the compound from the silica network of the compound. A concentrated aqueous solution of a water-soluble alkali silicate compound is generally called water glass.

  Only one type of water-soluble alkali silicate compound may be used, or two or more types may be used in combination.

  Furthermore, the composition for surface modification of the present invention contains at least one of silica sand and calcium carbonate. Since silica sand or calcium carbonate is deposited on the surface of the substrate, the composition for surface modification of the present invention can be applied to the surface of the substrate with any thickness.

  The composition for surface modification of the present invention may contain either one of silica sand and calcium carbonate. However, in order to make thickness easier to apply, it preferably contains both silica sand and calcium carbonate. Furthermore, by containing both silica sand and calcium carbonate, the coated surface becomes firm and the water resistance is further improved.

  The average particle diameter of the silica sand is not particularly limited and can be appropriately set according to the purpose of surface modification of the base material, and is preferably about 10 μm to 1 mm. For example, when it is desired to finish the surface of the base material smoothly, silica sand having a small particle size may be used, and when it is desired to finish the surface of the base material rough, silica sand having a large particle size (coarse) may be used. When the surface of the substrate is roughened, an anti-slip effect can be imparted to the surface of the substrate.

  The particle size of calcium carbonate is not particularly limited, and is preferably 0.1 μm to 100 μm, more preferably 1 μm to 50 μm, and still more preferably 5 μm to 30 μm. For example, when calcium carbonate having a small particle size is used, a part of calcium carbonate can be deposited more densely by filling fine holes on the surface of the substrate. Calcium carbonate includes heavy calcium carbonate derived from natural products such as limestone and chemically synthesized light calcium carbonate, either of which may be used.

  The surface modification composition of the present invention may further contain a color pigment. By containing a coloring pigment, not only can the surface of the substrate be modified (repaired), but it can also be colored in a desired color. The color pigment may be either an inorganic pigment or an organic pigment, but an inorganic pigment is preferred from the viewpoint of further improving the weather resistance after application to the substrate.

  Examples of color pigments include red pigments (eg, red lead and iron oxide red), yellow pigments (eg, yellow lead (chrome yellow), zinc yellow (one type of zinc yellow and two types of zinc yellow)), and blue pigments (ultramarine). Blue, prussian blue (potassium ferrocyanide, cobalt blue, etc.), green pigment (cobalt green, chromium oxide, phthalocyanine green, etc.), white pigment (zinc white, lead white, lithopone, titanium dioxide, precipitated barium sulfate, Barite powder, etc.) and black pigments (carbon black, titanium black, etc.).

  As the coloring pigment, one kind of coloring pigment or two or more kinds of coloring pigments having different particle sizes and origins may be used. For example, by using a white pigment and a black pigment, the substrate surface exhibits a concrete-like gray appearance.

  The silanol resin, the water-soluble alkali silicate compound, and silica sand or calcium carbonate are contained in the proportions described below when the solid content in the surface modification composition is 100% by mass. The silanol resin is preferably contained in a proportion of 5% by mass to 50% by mass, more preferably 10% by mass to 40% by mass. The water-soluble alkali silicate compound is preferably contained in a proportion of 5% by mass to 60% by mass, more preferably 10% by mass to 45% by mass. Silica sand or calcium carbonate is contained alone or in total, preferably 20% by mass to 75% by mass, more preferably 40% by mass to 70% by mass. When both silica sand and calcium carbonate are included, the mass ratio of silica sand and calcium carbonate is preferably 1: 1 to 5: 1.

  Furthermore, when it contains a color pigment, the color pigment can be added as appropriate according to the shade of the desired color.

  The surface modification composition of the present invention can be diluted with water or the like as necessary, and applied to the surface of the substrate with a brush, a spatula, a roller, or the like. The substrate is dried after application, but the drying conditions are not particularly limited. For example, it may be naturally dried for 1 hour to 1 day, although it varies depending on the application amount, application location and the like.

  After drying, it can be applied again and overcoated. By repeatedly applying and drying the coating, a coating surface having a greater thickness can be obtained and the finish becomes beautiful. As described above, the surface modifying composition of the present invention can be easily applied even by ordinary people. Furthermore, depending on the particle size of the silica sand used, it can be finished into a smooth and beautiful surface, or it can be finished into a rough surface for the purpose of imparting a non-slip effect.

The composition for surface modification of the present invention can be applied with a thickness capable of covering cracks on the surface of the substrate. Although depending on the degree of weathering or aging of the substrate surface, the surface modification composition of the present invention is preferably 300 g / m ² or more, more preferably 600 g / m ² or more, preferably in terms of solid content. It can be applied to the substrate surface in an amount of 3000 g / m ² or less, more preferably 2000 g / m ² or less. Furthermore, the thickness after drying may be preferably 0.15 mm or more, more preferably 0.3 mm or more, preferably 1.5 mm or less, more preferably 1 mm or less.

(Calcium-based inorganic surface modification kit)
The calcium-based inorganic base material surface modification kit of the present invention (hereinafter sometimes simply referred to as “surface modification kit”) includes a silanol group or a resin having a group that can be converted into a silanol group, and a water-soluble silicic acid. A liquid composition containing an alkali compound, and a powdered composition containing at least one of silica sand and calcium carbonate.

  The components contained in the liquid composition and the powdery composition are as described above. Moreover, it is preferable that a powdery composition contains both silica sand and calcium carbonate. Furthermore, the surface modification kit of the present invention contains the above-described colored pigment as necessary, or contains a colored pigment in at least one of the liquid composition and the powdery composition.

  The surface modification kit of the present invention can prepare the surface modification composition of the present invention by mixing a liquid composition and a powdery composition and, if necessary, a color pigment at the time of use. In the surface modification kit of the present invention, since the liquid composition and the powdery composition are stored separately, the storage stability is improved as compared with the surface modification composition in which these are mixed. In addition, the liquid composition and the powdery composition are prepared such that each component has the above-described content when they are mixed.

  The surface modification kit of the present invention is used in the form of the surface modification composition of the present invention by mixing a liquid composition, a powdery composition, and, if necessary, a color pigment at the time of use. The application method is as described above.

  The surface modification kit of the present invention includes a specification describing the method of use, if necessary.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited to these Examples.

(Test substrate)
A square plate-shaped concrete substrate having a side of 15 cm was prepared. This concrete base material had a mass ratio of cement to sand of 1: 2, and a water cement ratio of 50%. The concrete base material surface was artificially scratched to be in a deteriorated state, and used as a test base material.

Example 1
8 g of precipitated barium sulfate, 0.2 g of titanium black, 12 g of silanol group-containing styrene-acrylic resin emulsion (in terms of solid content), 15 g of sodium silicate aqueous solution (in terms of solid content), and silica sand (average particle size 200 μm) 40 g) was mixed. Water was added to this mixture and stirred to prepare 135 g of coating solution 1.

  The coating solution 1 was applied so that the solid content was about 6.8 g per one surface of the test substrate, and then subjected to natural drying for 3 hours.

  The surface of the test substrate after drying was firm with the scratches coated without the coating liquid 1 soaking into the substrate. Moreover, it had an appearance as if concrete had been applied. The thickness of the coated portion was measured to be about 0.15 mm.

  The test substrate after drying was further overcoated with the coating solution 1 (the same amount as the first) and subjected to natural drying for 3 hours. When the thickness of the coating portion was measured, it was about 0.3 mm, which was almost twice that before overcoating. Although this overcoated test substrate was impacted, no peeling or the like occurred. Furthermore, dissolution and peeling did not occur even when immersed in water.

(Example 2)
In Example 1, a coating solution 2 was prepared in the same procedure as in Example 1 except that 40 g of calcium carbonate (average particle size: 10 μm) was used instead of silica sand.

  The coating liquid 2 was applied so that the solid content was about 6.8 g per one surface of the test substrate, and subjected to natural drying for 3 hours.

  The surface of the test base material after drying was smooth and strong with the coating of the coating liquid 2 without being infiltrated into the base material and with the scratches covered. Moreover, it had an appearance as if concrete had been applied. The thickness of the coated portion was measured to be about 0.15 mm.

  The test substrate after drying was further overcoated with the coating solution 2 (the same amount as the first) and subjected to natural drying for 3 hours. When the thickness of the coating portion was measured, it was about 0.3 mm, which was almost twice that before overcoating. Although this overcoated test substrate was impacted, no peeling or the like occurred. Furthermore, dissolution and peeling did not occur even when immersed in water.

(Example 3)
In Example 1, in place of silica sand, 20 g of calcium carbonate (average particle size 10 μm) and 20 g of silica sand (average particle size 200 μm) were used. Prepared.

  The coating solution 3 was applied so that the solid content was about 6.8 g per one surface of the test substrate, and subjected to natural drying for 3 hours.

  The surface of the test base material after drying was smooth and strong with the coating of the coating liquid 3 without being infiltrated into the base material, and the scratches were covered. Moreover, it had an appearance as if concrete had been applied. The thickness of the coated portion was measured to be about 0.15 mm.

  The test substrate after drying was further coated with the coating solution 3 (the same amount as the first) and subjected to natural drying for 3 hours. When the thickness of the coating portion was measured, it was about 0.3 mm, which was almost twice that before overcoating. Although this overcoated test substrate was impacted, no peeling or the like occurred. Furthermore, dissolution and peeling did not occur even when immersed in water.

  According to the present invention, it is possible to easily repair the surface of an aged calcium-based inorganic base material such as deterioration due to weathering, dirt due to moss, abrasion, cracking, peeling, and the surface after repair is excellent. It is possible to provide a composition for surface modification of a calcium-based inorganic base material that has strength, water resistance, and weather resistance, and can be applied in any thickness. Therefore, it is useful in many fields including building materials, preferably for modifying cement-based floors and walls in parking lots, warehouses, factories and the like.

Claims (6)

A surface modification composition for imparting thickness to a calcium-based inorganic base material,
Containing a silanol group or a resin having a group that can be converted into a silanol group, a water-soluble alkali silicate compound, and at least one of silica sand or calcium carbonate ,
Here, when the solid content in the surface modification composition is 100% by mass, the silica sand or calcium carbonate is contained in a total of 20% by mass to 75% by mass,
Set Narubutsu. Containing both the sand and the calcium carbonate, the set composition as claimed in claim 1. Further contains a coloring pigment, a set composition as claimed in claim 1 or 2. A surface modification kit for imparting thickness to a calcium-based inorganic base material,
A liquid composition containing a resin having a silanol group or a group convertible to a silanol group and a water-soluble alkali silicate compound; and a powdery composition containing at least one of silica sand or calcium carbonate;
Only including,
Here, when the solid content in the liquid composition and the powdery composition is 100% by mass, the silica sand or calcium carbonate is contained in a total of 20% by mass to 75% by mass,
kit.   The kit according to claim 4, wherein the powdery composition contains both the silica sand and the calcium carbonate.   Furthermore, the kit of Claim 4 or 5 which contains a color pigment or at least one of the said liquid composition and the said powdery composition contains a color pigment.