JPH07329040A - Surface stain preventive agent for curtain wall tile and manufacture of curtain wall - Google Patents

Abstract

PURPOSE:To reduce chipping operation of a sheet piece and washing operation of a tile surface after releasing from a mold by a method wherein leakage of grout for placed cement is prevented in manufacture of a curtain wall. CONSTITUTION:Concrete is placed after treating tile with a surface stain preventive agent containing; (1) poly(meth)acrylic amide partial hydrolyzed product of 100000-3000000 molecular weight and 5-50mol% hydrolytic ratio; (2) a polymer of 100000-3000000 molecular weight of 50-95mol% of (meth)acrylic amide and 5-50mol% of (meth)acrylic acid and/or its salt; and/or (3) a polymer of 500000 or higher molecular weight of 5-10 mol% of acrylic amide propane sulfonate and 95-0mol% of (meth)acrylic amide and/or its salt. Thereby, water-soluble high-molecular polymers of (1)-(3) form a film for a concrete-placed surface of the tile, and besides finely coagulate cement components and fine particle contents. They prevent bleeding by thickening operation, and prevent grout effectively from leaking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface stain preventive agent for curtain wall tiles and a method of manufacturing a curtain wall, and more particularly, by preventing the leakage of concrete placed in the curtain wall manufacturing process.
The present invention relates to a surface stain preventive agent for a curtain wall tile and a method for manufacturing the curtain wall, which reduces the work of chipping the sheet pieces after demolding and cleaning the tile surface.

[0002]

2. Description of the Related Art In a curtain wall, a tile sheet in which tiles are temporarily fastened with a urethane sheet is laid in advance in a formwork, concrete is placed on the tile sheet, cured and hardened, and then demolded. It is manufactured by peeling off the urethane sheet.

In the above-mentioned conventional method for manufacturing a curtain wall, cement paste permeates into the gap between the tile and the urethane sheet due to the leakage of the cast concrete, and the paste adheres to the tile surface or the joint portion. Stick to the urethane sheet of.

Therefore, when the urethane sheet is peeled off after demolding, a part of the urethane sheet in the joint portion is fixed to the curtain wall side and remains. Further, the tile surface is in a state of being contaminated with the adhered matter of the paste.

For this reason, conventionally, after the urethane sheet is peeled off after removing from the mold, the urethane sheet piece that remains adhered to the curtain wall side is peeled off using a cutter, and a water washing operation using a polishing machine is performed. It is necessary to remove the paste adherent on the tile surface.

[0006]

However, since the work of removing the urethane sheet and the work of cleaning the tile surface require a great deal of labor and time, it is desired to reduce such work.

The present invention solves the above-mentioned conventional problems and prevents the leakage of the placed concrete in the curtain wall manufacturing process, so that the stripping work of the sheet piece after the mold release and the cleaning work of the tile surface are performed. An object of the present invention is to provide a surface stain preventive agent for curtain wall tiles and a method for producing a curtain wall that reduces the above-mentioned problems.

[0008]

The surface stain preventing agent for a curtain wall tile according to claim 1 is characterized by containing at least one water-soluble polymer selected from the group consisting of the followings.

The method for producing a curtain wall according to claim 2 is a method for producing a curtain wall by placing a tile in a formwork and then placing concrete in the formwork. The surface is treated with a surface stain preventive agent containing at least one water-soluble polymer selected from the group consisting of the following, and concrete is poured.

Poly (meth) acrylamide partial hydrolyzate having a molecular weight of 100,000 to 3,000,000 and a hydrolysis rate of 5 to 50 mol%. 50 to 95 mol% of (meth) acrylamide and (meth) acrylic having a molecular weight of 100,000 to 3,000,000. Polymer with 5 to 50 mol% of acid and / or salt thereof, with a molecular weight of 500,000 or more, 5 to 100 mol% of acrylamide propanesulfonic acid, and (meth) acrylamide 95
In the present specification, the poly (meth) acrylamide partial hydrolyzate is a “polyacrylamide partial hydrolyzate and / or a polymethacrylamide partial hydrolyzate”.
Refers to. Further, (meth) acrylamide refers to “acrylamide and / or methacrylamide”, and similarly,
(Meth) acrylic acid refers to "acrylic acid and / or methacrylic acid".

The present invention will be described in detail below.

The surface stain preventive agent for a curtain wall tile and the method for producing a curtain wall of the present invention include at least one water-soluble polymer selected from the group consisting of the above, and
As the poly (meth) acrylamide of the water-soluble high molecular weight polymer, those having a molecular weight of 300,000 to 1,500,000 and a hydrolysis rate of 5 to 40% are particularly preferable. A polymer of (meth) acrylamide and (meth) acrylic acid (ie,
The copolymer preferably has a molecular weight of 300,000 to 1,500,000, (meth) acrylamide 60 to 95 mol%, and (meth) acrylic acid 5 to 40 mol%. In addition, examples of the salt include sodium salt and ammonium salt. Further, as the polymer (or copolymer) of acrylamide propane sulfonic acid and (meth) acrylamide, polyacrylamide propane sulfonic acid having a molecular weight of 500,000 to 10,000,000 or a molecular weight of 500,000 to 1,000 is used.
A copolymer of 10 to 45 mol% of acrylamide propane sulfonic acid and 55 to 90 mol% of (meth) acrylamide is preferable, and examples of these salts include sodium salt and ammonium salt.

The surface-treating agent of the present invention may consist of only one type of these water-soluble high-molecular weight polymers or may include two or more types.

Usually, the surface treating agent of the present invention is used as an aqueous solution containing one or more of the above water-soluble polymer. In this case, the concentration of the aqueous solution is preferably about 0.01 to 5% by weight.

In the method of the present invention, the tile surface is treated with the surface treating agent of the present invention containing at least one of the above water-soluble polymer, and then concrete is poured.

Specifically, a tile before or after placing an aqueous solution containing 0.01 to 5% by weight of at least one of the above-mentioned water-soluble polymer in a mold using a sprayer or the like. It sprays on the concrete pouring surface side of the tile at a rate of about 200 to 500 ml per 1 m ^{2 of the} sheet, and then a little open time (usually 0.25 to 0.25).
After about 5 hours) to spread the surface treatment agent, concrete is poured.

With this, the action of the water-soluble polymer prevents the concrete from leaking, and the work of chipping the urethane sheet pieces after demolding and the work of cleaning the tile surface is greatly reduced.

The method for producing a curtain wall of the present invention is the same as the conventional curing conditions for the placed concrete except for treating the concrete placing surface of the tile with the surface treating agent of the present invention. It can be carried out similarly to the method.

[0019]

The above water-soluble polymer forms a film of water-soluble polymer on the concrete placing surface of the tile, and also has a flocculating action for finely aggregating the cement component and fine particles of concrete or increasing the viscosity of concrete. With the action of preventing breathing, the toro leakage is effectively prevented.

This prevents the concrete paste from infiltrating between the tile and the sheet surface of the urethane sheet or the like, and the residue of the sheet piece on the curtain wall side when peeling off the sheet after demolding is greatly reduced. Is reduced to. Further, the tile surface is prevented from being contaminated by the paste fixed matter.

Therefore, the chipping operation of the sheet piece after the demolding,
Cleaning work on the tile surface and joints is greatly reduced.

[0022]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples unless it exceeds the gist of the invention.

Example 1 A surface treating agent containing a poly (meth) acrylamide partial hydrolyzate having a molecular weight and a hydrolysis rate shown in Table 1 at a concentration of 0.1% by weight was prepared.

This surface treatment agent was sprayed onto the tile sheet surface placed in the mold with a sprayer at a rate of 200 per 1 m ^{2 of} the tile sheet.
Evenly sprayed at a rate of ˜500 ml.

Then, after standing for 3 hours, concrete was added, vibration molding was carried out by a bar-shaped vibrator, and steam curing was carried out overnight, followed by demolding.

After demolding, the following evaluation tests [1] to [3] were conducted, and the results are shown in Table 1.

Evaluation test [1] Evaluation of workability for peeling urethane sheet: Good workability when peeling a residual sheet piece with a cutter. Those with good workability were marked with "○", and those with poor workability were marked with "X".

[2] Surface state of tile surface and joint: The surface is soiled depending on the degree of toro leakage. Those with little dirt and good surface condition were marked with "○", and those with much dirt and poor surface condition were marked with "X".

[3] Washing time: The time for washing the tile surface and the joint portion with water using a sander (time required for washing water with an area of 1 m ² ) was measured.

For comparison, the same evaluation was performed for the case where no surface treatment agent was used (blank), and the results are shown in Table 1.

[0031]

[Table 1]

Example 2 Using the water-soluble high-molecular polymer (salt of the copolymer of (meth) acrylamide and (meth) acrylic acid) at the concentration of 0.1% by weight shown in Tables 2 and 3, Curtain walls were manufactured in the same manner, and evaluation tests [1] to [3] were conducted in the same manner, and the results are shown in Tables 2 and 3.

[0033]

[Table 2]

[0034]

[Table 3]

Example 3 A water-soluble high-molecular polymer (polyacrylamide propane sulfonic acid, or 0.1% by weight) shown in Tables 4 and 5 was used.
A curtain wall was produced in the same manner as in Example 1 using a salt of a copolymer of acrylamide propane sulfonic acid and (meth) acrylamide, and [1] to
The evaluation test of [3] was conducted, and the results are shown in Tables 4 and 5.

[0036]

[Table 4]

[0037]

[Table 5]

Example 4 Example 1 was repeated except that among the water-soluble high molecular weight polymers listed in Tables 1 to 5, the water soluble high molecular weight polymers according to the present invention shown in Table 6 were used together at the concentrations shown in Table 6. Curtain walls were manufactured in the same manner, and the evaluation tests [1] to [3] were conducted in the same manner, and the results are shown in Table 6.

[0039]

[Table 6]

The following are clear from Tables 1-6.
That is, regarding the workability of chipping, since the water-soluble polymer according to the present invention prevents the leaking into the gap between the urethane sheet and the tile, the work of chipping the urethane sheet is reduced. Further, in the surface condition in the example of the present invention, since there was almost no toro leakage, the tile surface and the joint portion were free from stains. Furthermore, it has become possible to shorten the water washing work time with the sander to 20 to 35% of the conventional time.

[0041]

As described in detail above, according to the surface stain preventive agent for curtain wall tiles and the method for producing a curtain wall of the present invention, it is possible to prevent the leakage of the cast concrete in the step of producing the curtain wall. As a result, it is possible to reduce the work of picking up the sheet pieces after the demolding and the work of cleaning the tile surface.

Therefore, the manufacturing efficiency can be improved by the labor saving of the manufacturing process and the manufacturing cost can be reduced, which is industrially extremely advantageous.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Ichihashi 3-4-7 Nishishinjuku, Shinjuku-ku, Tokyo Kurita Industry Co., Ltd. (72) Inventor Kaoru Ishizuka 3-4-7 Nishishinjuku, Shinjuku-ku, Tokyo Kurita Industry Co., Ltd. (72) Inventor, Yoshisuke Hadamada, 53-1331, Shimbashi, Minato-ku, Tokyo In-house stock company of Japan Humm (72) Inventor Hideki Ikawa, 5-33, Shimbashi, Minato-ku, Tokyo No. 11 Japan Humm Tube Stock Company

Claims (2)

[Claims] 1. A surface stain preventing agent for a curtain wall tile, which contains at least one water-soluble polymer selected from the group consisting of: Poly (meth) acrylamide partial hydrolyzate having a molecular weight of 100,000 to 3,000,000 and a hydrolysis rate of 5 to 50 mol%. (Meth) acrylamide of 50 to 95 mol% and a (meth) acrylic acid of 5 having a molecular weight of 100,000 to 3,000,000. Polymer with 50 mol% and / or salt thereof Acrylamide propane sulfonic acid having a molecular weight of 500,000 or more 5 to 100 mol% and (meth) acrylamide 95
To 0 mol% and / or salt thereof 2. A method for producing a curtain wall by placing tiles in a formwork and then placing concrete in the formwork, wherein the concrete placing surface of the tile is selected from the group consisting of: A method for producing a curtain wall, which comprises pouring concrete after treating with a surface stain inhibitor containing at least one selected water-soluble polymer. Poly (meth) acrylamide partial hydrolyzate having a molecular weight of 100,000 to 3,000,000 and a hydrolysis rate of 5 to 50 mol%. (Meth) acrylamide of 50 to 95 mol% and a (meth) acrylic acid of 5 having a molecular weight of 100,000 to 3,000,000. Polymer with 50 mol% and / or salt thereof Acrylamide propane sulfonic acid having a molecular weight of 500,000 or more 5 to 100 mol% and (meth) acrylamide 95
To 0 mol% and / or salt thereof