JP2011057507A - Surface repairing material for lightweight cellular concrete panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface repairing material for a lightweight cellular concrete panel used in order to repair the surface of the concrete panel by refilling a flaw wherein a depth from the surface is comparatively shallow as a scratching flaw made on the surface of the lightweight cellular concrete panel. <P>SOLUTION: The surface repairing material for the lightweight cellular concrete panel is obtained by incorporating water of 2-150 wt.% at the outside rate to a solid component ((A)+(B)=100 wt.%) consisting of a water-soluble adhesive consisting of (A) 80-99.7 wt.% lightweight cellular concrete powder having an average particle size of 0.03-0.5 mm and in an absolutely dried condition and (B) 0.3-20 wt.% solid component of an active principle. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lightweight cellular concrete used for repairing a concrete panel surface by refilling a relatively shallow scratch having a depth of 1 mm or less from the surface, such as a scratch formed on the surface of a lightweight cellular concrete panel. The present invention relates to a surface repair material for a panel and a manufacturing method thereof.

Lightweight cellular concrete panels (hereinafter referred to as ALC panels) are porous and light in weight, while being brittle and low in hardness as compared to ordinary concrete. For this reason, there is a drawback in that scratches and chips are likely to occur during manufacture and product conveyance.
Therefore, conventionally, repair materials for repairing scratches, chips, etc. on the surface of the ALC panel have been proposed.
For example, Patent Document 1 discloses an ALC panel repair material in which obsidian perlite and a soluble resin powder are blended with an ALC repair material composed of cement, pearlite, and a thickener.
Patent Document 2 discloses a repair material for ALC panels comprising 20 to 45% by weight of Portland cement, 15 to 25% by weight of ALC powder, 40 to 60% by weight of obsidian perlite powder, and 8 to 20% by weight of acrylic latex. It has been known.

JP-A-1-203282 Japanese Patent Laid-Open No. 2003-300758

These repair materials for ALC panels are filled in missing parts caused by collision of the edges and corners of the panel with other members when the ALC panel is transported to the construction site and attached to the structure. It was.
That is, these repair materials are filled in relatively large defects generated in the panel and used for the purpose of shaping the panel shape.
Therefore, the repair portion filled with the repair material is required to have sufficient compressive strength as a panel as well as strong adhesion to the ALC panel base material. Therefore, as described in Patent Documents 1 and 2, a method has been adopted in which a sufficient compressive strength is provided in the repair material by blending the cement component into the repair material.
Also, obsidian perlite was blended in order to facilitate the ironing work of repair material on large defects.

These repair materials are commonly used for repairs such as scratches having a relatively shallow depth from the panel surface. Therefore, when the panel surface gets wet with rainwater or the like, most of the panel surface into which water has permeated becomes a wet color. When this color was checked in Kodansha's 1989 edition of the Japanese Dictionary of Color Names, it was a color similar to flax or ivory. On the other hand, the repaired portion was colored gray due to the cement component contained in the repair material.
In particular, in the manufacturing process of the ALC panel, scratches generated when a semi-cured body is cut with a piano wire to which foreign matter has adhered are repaired by extending in the longitudinal direction of the completed panel after autoclaving. The problem became prominent and the appearance of the panel was impaired.
In recent years, the use of ALC panels is often used without painting on the inner wall of a warehouse or the like, and even when repaired, the repaired part has become a prominent claim. In addition, since the ALC panel is temporarily placed outdoors after it is built in and after construction, the panel surface gets wet when it rains, and the repaired part turns gray, making it more noticeable. .

  Therefore, the object of the present invention is to repair the concrete panel surface by refilling relatively shallow scratches having a depth of 1 mm or less from the surface, such as scratches formed on the surface of the ALC panel. An object of the present invention is to provide a surface repair material for a lightweight cellular concrete panel which does not make its repaired part conspicuous even when wet with rainwater or the like.

In order to solve the above problems, the present invention provides:
The average particle size is 0.03 to 0.5 mm, and the light-weight cellular concrete granule in the absolutely dry state is 80 to 99.7% by weight (A), and the solid content of the active ingredient is 0.3 to 20% by weight. % For an ALC panel containing 2 to 150% by weight of water with respect to a solid component ((A) + (B) = 100% by weight) comprising a water-soluble adhesive that is (B) The surface repair material was adopted. The average particle size was measured with a laser diffraction particle size distribution measuring device.
The following items were set as preferable conditions.
The lightweight cellular concrete granule is a granule that has passed through a sieve with a nominal size of 1.18 mm of JIS Z 8801 (hereinafter referred to as 1.18 mm sieve), and the carbonation rate of the lightweight cellular concrete granule is 30% or less, the water-soluble adhesive is methylcellulose,
And the surface repair material for ALC panels contains 40 to 150% by weight of water in an outer portion with respect to the solid component of the surface repair material, or is in a paste form, or 2 to 40 in the outer portion. It is in a solid form containing water by weight,

According to the present invention, the surface of the ALC panel can be repaired by refilling a relatively shallow scratch having a depth of 1 mm or less from the surface, such as a scratch on the surface of the ALC panel. Even in the dry state, the repaired portion is almost the same as the color of the unrepaired portion. The almost same color means a state in which the repaired portion cannot be identified by color when observed visually 1 m away from the panel surface.
This is because methylcellulose in the repair material after curing absorbs water and there is a gap between the ALC powder particles in the repair material after curing, making it easier for water to penetrate. Also, once repaired, the repaired part is not easily melted away by rain or the like.

The surface repair material for an ALC panel in the present invention has an average particle size of 0.03 to 0.5 mm, and lightweight cellular concrete particles in the absolutely dry state of 80 to 99.7 wt% (A), With respect to a solid component ((A) + (B) = 100% by weight) comprising a water-soluble adhesive having an active ingredient solid content of 0.3 to 20% by weight (B), an external ratio of 2 to 150 Contains water by weight.
In this surface repair material, the ALC powder is the main component of the filler, and the water-soluble adhesive has both the functions of securing the adhesion between the ALC powder and the powder and the panel base material. Plays.

This surface repair material is suitable as a repair material for the ALC panel, which is the same material, because the ALC powder is blended in a large amount of 80 to 99.7% by weight. Furthermore, when this repair material is filled into a relatively shallow scratch with a depth of 1 mm or less from the panel surface, the repaired portion will be wetted by the ALC panel (flax or ivory) even if the panel surface gets wet with rainwater, etc. Color) and the repaired part does not stand out from its surroundings.
The material that makes fine repairs on the panel surface, such as scratches, does not require its own strength, is easy to fill in narrow and shallow groove-like scratches, and adheres closely to the color of the repaired part and the panel base material. It is important to match.

And since this surface repair material contains 2-150 weight% of water by the outer part with respect to the solid component, the form can be made into a paste form or solid form.
It is preferable that the ALC granular material is a granular material that has passed through a 1.18 mm sieve because it can be easily filled deeply such as scratches.

In addition, since the yellow color of the ALC powder particles increases due to carbonation and a color difference from the base material appears, the carbonation rate (CO ₂ conversion) is preferably 30% or less.

Moreover, this surface repair material is blended so that the water-soluble adhesive is 0.3 to 20% by weight in terms of the solid content of the active ingredient. For this reason, the adhesion between the ALC particles and between the particles and the panel base material is sufficiently ensured. As a result, there is no inconvenience that the repair material of the repaired part peels off from the panel base material and falls off.
As this water-soluble adhesive, those which become transparent or translucent after curing are suitable. Starch adhesives, glue adhesives based on gelatin, ether cellulose adhesives, aqueous polymers Isocyanate adhesives can be used.
As the ether-based cellulose adhesive, methyl cellulose and carboxyl cellulose are preferable, and as the aqueous polymer isocyanate-based adhesive, aqueous vinyl urethane is preferable.
When methylcellulose is used as the water-soluble adhesive, the ALC powder is 97 to 99.5% by weight and the methylcellulose is 0.5 to 3% by weight. It is most desirable from the standpoint of adhesion between the body and the panel base material, as well as economic efficiency.

In addition, if the surface repair material is in a paste form containing 40 to 150% by weight of water with respect to the solid component, appropriate fluidity is imparted to the surface repair material, and scratches, etc. It is possible to easily push the surface repair material deep into the surface with a fingertip or the like.
The surface repair material that is pushed in is connected to the inside of the pores that open on the panel surface, so that the anchor effect is achieved. Even if the surface repair material gets wet or dries in the rain, it will fall off the panel surface. It becomes difficult to do.
Therefore, it is suitable for the panel surface repair work in the product stage before factory shipment.

Further, when the surface repair material is in a solid form containing 2 to 40% by weight of water as an outer portion relative to the solid component, the handling and carrying property is good.
Furthermore, if the shape is made a rod and the tip portion is simply rubbed into a scratch or the like, the surface repair material can be easily filled deep into the wound.
Therefore, it is suitable for the panel surface repair at the final stage at the construction site.

  In addition, the solid component of the surface repair material comprising the ALC granular material and the water-soluble adhesive contains a 2 to 20% by weight solid component water repellent as an outer portion, and is a paste or solid surface repair material. If the panel surface that already has a water-repellent function is repaired, even if the panel surface gets wet with rainwater, etc., the repaired part will be water-repellent in the same way as its surroundings, so there will be color differences and discoloration from the surroundings. Does not occur. The water repellent is preferably a silicon or silane emulsion type.

Next, the manufacturing method of the surface repair material for ALC panels in this invention is demonstrated.
The surface repair material for paste-like ALC panels is composed of 80 to 99.7% by weight of ALC powder having an average particle size of 0.03 to 0.5 mm and an active ingredient contained in a water-soluble adhesive as a solid content. The solid component added to 0.3 to 20% by weight is 100% by weight, and 40 to 150% by weight of water is added to the solid component and kneaded.
When the water content to be added is 40 to 150% by weight with respect to 100% by weight of the solid component, appropriate fluidity is ensured and the work of filling the scratch with the repair material becomes easy.

At this time, as explained in the above-mentioned surface repair material, the ALC powder is preferably a powder having a carbonation rate of 30% or less and having passed through a 1.18 mm sieve. Adhesives become transparent or translucent after curing, specifically starch-based adhesives, glue-based adhesives based on gelatin, ether-based cellulose adhesives, aqueous polymer isocyanate-based adhesives The agent can be used.
Furthermore, it is 97-99.5% by weight of ALC particles and 0.5-3% by weight of methylcellulose, and adhesion between ALC particles and between the particles and the panel base material Furthermore, it is most desirable from the aspect of economy.

The surface repair material for an ALC panel of a solid molded body is 80 to 99.7% by weight of an ALC powder having an average particle size of 0.03 to 0.5 mm, and an active ingredient containing a water-soluble adhesive The solid component obtained by adding 0.3 to 20% by weight in terms of solid content is taken as 100% by weight, and 10% to 70% by weight of water is added and kneaded to form a predetermined shape. Manufactured by.
Drying may be performed by either natural drying or forced drying, and finally, a solid molded body containing 2 to 40% by weight of water as an outer portion is obtained.
In particular, with respect to 100 parts by weight of solids, the water added is 50-60% by weight, molded into a rod shape with a diameter of 10 mm, and then dried in a hot air drying oven at 60-80 ° C. for 2-3 hours. The obtained solid surface repair material has a hard outer side and a soft mid-depth part. Therefore, it is easily filled into scratches and hard to break during filling because the outside is hard.

At this time, the ALC granular material is a granular material having a carbonation rate of 30% or less and passed through a 1.18 mm sieve, and the preferred water-soluble adhesive is the pasty ALC panel. The same as described in the surface repair material.
The method of molding into a predetermined shape may be any method such as press molding, extrusion molding, or molding by human hands.

  Examples of the present invention and comparative examples will be described below.

[Example 1]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter was measured with the laser diffraction type particle size distribution measuring apparatus.
A paste-like surface repair material for ALC was prepared by adding 70% by weight of water and kneading the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose. Obtained.

[Example 2]
The ALC granular material of the repair material obtained in Example 1 was further sieved with a sieve having a nominal size of 300 μm, and the remainder of the sieve was used as the repair material. The average particle size of the particles was measured by a laser diffraction particle size distribution measuring device and found to be 0.50 mm. A paste-like surface repair material for ALC was prepared by adding 70% by weight of water and kneading the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose. Obtained.

[Example 3]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a sieve having a nominal size of 75 μm, and the ALC particles that passed through the sieve were used as the raw material for the repair material.
It was 0.03 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus. A paste-like surface repair material for ALC was prepared by adding 70% by weight of water and kneading the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose. Obtained.

[Example 4]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A surface repair material for paste-like ALC is prepared by adding 70% by weight of water to a mixture of 99.7% by weight of this ALC powder and 0.3% by weight of methylcellulose and kneading. Obtained.

[Example 5]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A paste-like surface repair material for ALC was obtained by adding 70% by weight of water to a mixture of 80% by weight of this ALC powder and 20% by weight of methylcellulose and kneading them.

[Example 6]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A paste-like surface repair material for ALC was prepared by adding 70% by weight of water and kneading a mixture of 99.5% by weight of this ALC powder and 0.5% by weight of methylcellulose. Obtained.

[Example 7]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A paste-like surface repair material for ALC was obtained by adding 70% by weight of water and kneading the mixture of 97% by weight of this ALC powder and 3% by weight of methylcellulose.

[Example 8]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A surface repair material for paste-like ALC is prepared by adding 40% by weight of water to a mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose and kneading them. Obtained.

[Example 9]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A paste-like surface repair material for ALC was prepared by adding 150% by weight of water and kneading the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose. Obtained.

[Example 10]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
To the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose, 60% by weight of water and 5% by weight of an active solid component are added as a water-repellent silicone emulsion. Then, a paste-like surface repair material for ALC was obtained by kneading.

[Example 11]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
To the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose, 60% by weight of water and 2% by weight of an active solid component are added as a water-repellent silicone emulsion. Then, a paste-like surface repair material for ALC was obtained by kneading.

[Example 12]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
To the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose, 60% by weight of water and 10% by weight of a silicone emulsion water repellent are added. Then, a paste-like surface repair material for ALC was obtained by kneading.

[Example 13]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
Even though 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose were mixed, 60% by weight of water was added and kneaded to obtain a paste.
This was shaped into a rod shape (diameter 10 mm, length 50 mm) and then dried in a drying oven at 70 ° C. for 6 hours to obtain an ALC color with a moisture content of 8% by weight with respect to the solid component ( A white surface-shaped solid surface repair material was obtained.
When this was cut into two from the center in the length direction and the cross section was observed visually, it was ALC color (white) uniformly from the outside to the middle depth.
The moisture content of the solid surface repair material was determined by further drying the obtained solid surface repair material for 12 hours in a drying furnace at 105 ° C. to make it completely dry.

[Example 14]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
Even though 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose were mixed, 60% by weight of water was added and kneaded to obtain a paste.
This was shaped by hand into a rod shape (diameter 10 mm, length 50 mm), then dried in a drying oven at 70 ° C. for 12 hours, and the ALC color (white color) was 2% by weight with respect to the solid component. The rod-shaped solid surface repair material was obtained.
When this was cut into two from the center in the length direction and the cross section was observed visually, it was ALC color (white) uniformly from the outside to the middle depth.
The moisture content of the solid surface repair material was determined by further drying the obtained solid surface repair material for 12 hours in a drying furnace at 105 ° C. to make it completely dry.

[Example 15]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus. Even though 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose were mixed, 60% by weight of water was added and kneaded to obtain a paste.
This was shaped into a rod shape (diameter 10 mm, length 50 mm), then dried in a drying oven at 70 ° C. for 2 hours, and the ALC color (white) with a moisture content of 40% by weight with respect to the solid component was obtained. A rod-shaped solid surface repair material was obtained.
When this was cut into two from the center in the length direction and the cross section was observed visually, the outside was dry and ALC color (white), but the middle depth was wet (flax or ivory) I was doing.
The moisture content of the solid surface repair material was determined by further drying the obtained solid surface repair material for 12 hours in a drying furnace at 105 ° C. to make it completely dry.

[Example 16]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
Even though 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose were mixed, 60% by weight of water was added and kneaded to obtain a paste.
After shaping this into a rod shape (diameter 10 mm, length 50 mm), it was dried in a drying oven at 70 ° C. for 3 hours, and the ALC color (white) with a moisture content of 30% by weight with respect to the solid component was obtained. A rod-shaped solid surface repair material was obtained.
When this was cut into two from the center in the length direction and the cross section was observed visually, the outside was dry and ALC color (white), but the middle depth was wet (flax or ivory) I was doing.
The moisture content of the solid surface repair material was determined by further drying the obtained solid surface repair material for 12 hours in a drying furnace at 105 ° C. to make it completely dry.

[Example 17]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
Even though 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose were mixed, 60% by weight of water was added and kneaded to obtain a paste.
After this was shaped into a rod shape (diameter 10 mm, length 50 mm), it was naturally dried for 12 hours in an airless room at 20 ° C., and the wet color (flax) with a moisture content of 40% by weight with respect to the solid component. A solid surface repair material in the form of a stick of color or ivory color) was obtained.
When this was cut into two from the center in the length direction and the cross section was visually observed, it was uniformly wet (flax or ivory) from the outside to the middle depth.
The moisture content of the solid surface repair material was determined by further drying the obtained solid surface repair material for 12 hours in a drying furnace at 105 ° C. to make it completely dry.

[Example 18]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve and 83.1% by weight of ALC powder passed through the sieve. This ALC powder was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
Even though 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose were mixed, 60% by weight of water was added and kneaded to obtain a paste.
After this was shaped into a rod shape (diameter 10 mm, length 50 mm), it was naturally dried in a windless room at 20 ° C. for 24 hours to obtain a wet color (flax) with a moisture content of 30% by weight with respect to the solid component. A solid surface repair material in the form of a stick of color or ivory color) was obtained.
When this was cut into two from the center in the length direction and the cross section was visually observed, it was uniformly wet (flax or ivory) from the outside to the middle depth.
The moisture content of the solid surface repair material was determined by further drying the obtained solid surface repair material for 12 hours in a drying furnace at 105 ° C. to make it completely dry.

[Example 19]
65% by weight of the dust collected from the ALC panel processing machine and 35% by weight of the dust collected forcibly carbonated were dried in a drying oven at 105 ° C. for 12 hours to be completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
Moreover, the carbonation rate of this was 30%. A surface repair material for ALC in the form of a paste was prepared by adding 70% by weight of water and kneading the mixture of 99.8% by weight of this ALC powder and 1.5% by weight of methylcellulose. Obtained.

[Evaluation methods]
Each surface repair material obtained was repaired with a scratch (width 1 mm × depth 1 mm × length 300 mm) previously provided in the center of an ALC panel (width 300 mm × length 1000 mm × thickness 100 mm). . At this time, when the surface repair material was a paste, a spatula was used, and when the surface repair material was a solid, the tip of the surface repair material was rubbed into the scratched portion to fill the surface repair material deep into the scratch. In the case of the filling operation at that time, “◯” indicates that the filling was easy, “Δ” indicates that the filling was not easy, but “x” indicates that the filling was not complete.

  After the repaired panel was naturally dried for 3 hours, the presence or absence of a color difference between the repaired portion and the surrounding area was visually observed at a distance of 1 m and 2 m from the panel surface.

  Next, the panel surface was wetted with water, and the presence or absence of a color difference between the repaired portion and the surrounding area was visually observed 1 m away from the panel surface. The repair material to which water repellent was added was repaired using a water repellent panel. The case where the repaired part could not be identified was designated as “◯”, the case identified by gazing was designated as “△”, and the case where the repaired part was easily identified was designated as “X”.

  Furthermore, when the wet panel surface is forcibly dried with a dryer for 30 seconds, the state of peeling of the surface repair material from the panel surface is confirmed. When there is no peeling, “○”, when peeling is partially confirmed “△”, and “×” when peeling was confirmed at most repair locations.

  For the overall evaluation, “◯” is 2 points for each item, “△” is 1 point, the total is 10 points “O”, 9 to 8 points “△”, and “X” is in the item or The case of 7 points or less was set as “x”.

  The results of the above examples and the following comparative examples are shown in Table 1.

[Comparative Example 1]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This ALC powder was used as a raw material for the repair material. It was 0.68 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A paste-like surface repair material for ALC was prepared by adding 70% by weight of water and kneading the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose. Obtained.

[Comparative Example 2]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a sieve having a nominal size of 75 μm, and the ALC powder particles passing through the sieve were pulverized with a cyclone type pulverizer to obtain a raw material for the repair material.
It was 0.006 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus. A paste-like surface repair material for ALC was prepared by adding 70% by weight of water and kneading the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose. Obtained.

[Comparative Example 3]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material.
It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus. A surface repair material for paste-like ALC was prepared by adding 70% by weight of water to the mixture of 99.8% by weight of this ALC powder and 0.2% by weight of methylcellulose and kneading them. Obtained.

[Comparative Example 4]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material.
It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus. A paste-like surface repair material for ALC was obtained by adding 70% by weight of water and kneading the mixture of 70% by weight of this ALC powder and 30% by weight of methylcellulose.

[Comparative Example 5]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material.
It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus. A surface repair material for ALC in the form of a paste is obtained by adding and mixing 35% by weight of water to a mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose. Obtained.

[Comparative Example 6]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material.
It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus. A surface repair material for paste-like ALC was prepared by adding 180% by weight of water to a mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose and kneading them. Obtained.

[Comparative Example 7]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material.
It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus. Water-repellent agent of silicon emulsion in which 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose are mixed, and 60% by weight of water and the solid content of the active ingredient are 1% by weight. Was added and kneaded to obtain a paste-like surface repair material for ALC.

[Comparative Example 8]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
Water-repellent agent of silicone emulsion in which 98.5% by weight of this ALC granular material and 1.5% by weight of methylcellulose are mixed, and 60% by weight of water and 20% by weight of the solid content of the active ingredient Was added and kneaded to obtain a paste-like surface repair material for ALC.

[Comparative Example 9]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A mixture of 98.5% by weight of this ALC granular material and 1.5% by weight of methylcellulose was shaped by hand into a rod shape (diameter 10 mm, length 50 mm) and then dried in a drying oven at 70 ° C. for 15 hours. A bar-shaped solid surface repair material of ALC color (white) having a water content of 1% by weight with respect to the solid component was obtained.
When this was cut into two from the center in the length direction and the cross section was observed visually, it was ALC color (white) uniformly from the outside to the middle depth.
The moisture content of the solid surface repair material was determined by further drying the obtained solid surface repair material for 12 hours in a drying furnace at 105 ° C. to make it completely dry.

[Comparative Example 10]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose was shaped by hand into a rod shape (diameter 10 mm, length 50 mm) and then dried in a drying oven at 70 ° C. for 1 hour. A bar-shaped solid surface repair material of ALC color (white) having a water content of 50% by weight with respect to the solid component was obtained.
When this was cut into two from the center in the length direction and the cross section was observed visually, the outside was dry and ALC color (white), but the middle depth was wet (flax or ivory) I was doing.
The moisture content of the solid surface repair material was determined by further drying the obtained solid surface repair material for 12 hours in a drying furnace at 105 ° C. to make it completely dry.

[Comparative Example 11]
The dust collected from the ALC panel processing machine was dried in a drying oven at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material. It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus.
A paste was obtained by adding 60% by weight of water and kneading the mixture of 98.5% by weight of this ALC powder and 1.5% by weight of methylcellulose. This was shaped into a rod shape (diameter 10 mm, length 50 mm) and then naturally dried for 6 hours in a windless room at 20 ° C., and the wet color (flax) with a moisture content of 55% by weight relative to the solid component. A solid surface repair material in the form of a stick of color or ivory color) was obtained.
When this was cut into two from the center in the length direction and the cross section was visually observed, it was uniformly wet (flax or ivory) from the outside to the middle depth.
The moisture content of the solid surface repair material was determined by further drying the obtained solid surface repair material for 12 hours in a drying furnace at 105 ° C. to make it completely dry.

[Comparative Example 12]
60% by weight of the dust collected from the ALC panel processing machine and 38% by weight of the dust collected by forcibly carbonizing the dust were dried in a drying furnace at 105 ° C. for 12 hours to make it completely dry. This was sieved with a 1.18 mm sieve, and the ALC powder that passed through the sieve was used as a raw material for the repair material.
It was 0.15 mm when the average particle diameter of this was measured with the laser diffraction type particle size distribution measuring apparatus. The carbonation rate of this was 35%. A surface repair material for ALC in the form of a paste was prepared by adding 70% by weight of water and kneading the mixture of 99.8% by weight of this ALC powder and 1.5% by weight of methylcellulose. Obtained.

[Experimental result]
Since the surface repair material of Examples 1-19 contains the methylcellulose which is 80-99.7 weight% and 0.3-20 weight% of ALC granular material with a particle size of 0.5 mm or less, it repairs After partial drying, the repaired part in the panel could not be recognized even by visual observation from a place 1 m away from the panel surface.

In the surface repair materials of Examples 1 to 19, even when the panel surface is wetted with water, the repaired portion of the scratch shows the same wet color (flax or ivory color) as the non-repaired portion, and is 1 m away from the panel surface Even when visually observed, the color difference from the surroundings was not recognized.
In the case of a water repellent-containing product, the repaired part using a repair material in which the water repellent is mixed with 2 to 10% by weight with respect to the total weight of the ALC particles and methylcellulose is the same as the unrepaired part. No wet color (flax color or ivory color) was shown and no color difference from the surroundings was recognized.
Furthermore, these surface repair materials could be filled easily and did not peel off from the panel surface even after drying.

  The solid surface repair materials of Examples 13 to 18 are easy to use because they are solid, and can be used for final finishing on site. In Examples 13 to 14, the outer side and the mid-deep part are hard, so that they are effective for repairing small scratches and do not require drying. In Examples 17-18, both the outer side and the mid-deep part are soft, so that it is effective for repairing a large scratch, and drying is faster than that of a paste. In Examples 15 to 16, since the outer side is hard and the mid-depth portion is soft, the strength is sufficient and it is difficult to break, and it is also effective for repairing a large scratch.

On the other hand, in Comparative Example 1, it was difficult to fill the surface repair material due to the presence of ALC powder particles having a particle size exceeding 1 mm, and the scratches could not be completely filled.
In Comparative Example 2, the particle size of the ALC granular material was too fine, and with this blending, it became difficult to fill and peeling occurred. In addition, the color of the repaired part was darkened and different in color. This is presumed to be because the silica crystals in the ALC particles were also crushed.
In Comparative Example 3, peeling occurred due to a shortage of methylcellulose. In Comparative Example 4, the cause was unknown, but the repaired part was darkened and different in color. In addition, mixing a large amount of methylcellulose increases the cost and is not practical.
In Comparative Example 5, since the amount of water was too small, the surface repair material became rough and could not be filled deeply into the scratches. In Comparative Example 6, since the amount of water was excessive, it was difficult to fill the surface repair material, and the repaired portion was thin after drying and the repaired portion was conspicuous.
In Comparative Example 7, since the amount of water repellent was too small, the repaired portion showed a wet color (flax color or ivory color), and a color difference occurred with the unrepaired portion.
Comparative Example 8 has no problem in performance, but is not realistic because of high cost.
In Comparative Example 9, water was too little, so the surface repair material was too hard to be filled, and peeling was also observed.
In Comparative Examples 10 and 11, the rod shape could not be maintained due to excessive water and broke during filling.
In Comparative Example 12, the repaired portion became yellow and was particularly noticeable when wet.

  It should be noted that the specific configuration of the present invention is not limited to this embodiment, and any design change or the like within a range not departing from the gist of the invention is included in the present invention.

  According to the present invention, appropriate repairs are made to scratches on the panel surface, and the contribution to the ALC panel industry is tremendous.

Claims (7)

  The average particle size is 0.03 to 0.5 mm, and the light-weight cellular concrete granule in the absolutely dry state is 80 to 99.7% by weight (A), and the solid content of the active ingredient is 0.3 to 20% by weight. % (B) lightweight cellular concrete containing 2 to 150% by weight of water with respect to the solid component ((A) + (B) = 100% by weight) comprising a water-soluble adhesive Surface repair material for panels.   The surface repair material for a lightweight cellular concrete panel according to claim 1, wherein the lightweight cellular concrete granular material is a granular material that has passed through a sieve having a nominal size of JIS Z 8801 of 1.18 mm.   The surface repair material for lightweight cellular concrete panels according to claim 1 or 2, wherein the lightweight cellular concrete powder has a carbonation rate of 30% or less.   The surface repair material for lightweight cellular concrete panels according to any one of claims 1 to 3, wherein the water-soluble adhesive is methylcellulose.   The paste-like lightweight bubble which contains 40 to 150 weight% of water by the outer part with respect to the solid component of the surface repair material for lightweight lightweight concrete panels as described in any one of the said Claims 1-4 Surface repair material for concrete panels.   Solid light-weight air bubbles containing 2 to 40% by weight of water in an external ratio with respect to the solid component of the surface repair material for lightweight light-weight concrete panels according to any one of claims 1 to 4. Surface repair material for concrete panels.   The lightweight cellular concrete panel containing a water repellent having an effective solid content of 2 to 10% by weight based on the solid component of the surface repair material for the lightweight cellular concrete panel according to claim 5 or 6. Surface repair material.