JPS59129280A - Waterproofing of concrete surface with polymer sheet - Google Patents

Abstract

PURPOSE:To prevent lowering of adhesive power due to temperature rise, by applying an alkali-crosslinking adhesive in emulsion to the surface of concrete and forming a crosslinked adhesive layer between the concrete and a sheet made of polymer material. CONSTITUTION:An emulsion type alkali-crosslinking adhesive is prepared by adding surfactant, thickener, tackifier, etc. to a cationic or nonionic polymer obtained by copolymerizing vinyl monochloroacetate, methylolacrylamide, etc. with (meth)acrylic ester. The adhesive is applied to the surface of concrete and a sheet made of polymer material (e.g. roofing sheet) is laid over it so that alkaline substances in the concrete may be dissolved in water in the adhesive and the sheet and concrete may be bonded together by the crosslinked adhesive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for waterproofing a concrete surface using a molded polymer material.

In order to fix and integrate a sheet made of molded polymer material onto a concrete surface such as the roof of a building, there are two methods: (1) using split nails or rivets; (2) heat-welding on the back of the sheet; Methods such as (3) using a bonding member and (3) providing an adhesive at the interface to be fixed and fixing via this are possible, but the method (3) using an adhesive is the most common.

Conventionally, when fixing a sheet to a concrete surface using an adhesive, a solvent-based adhesive was applied to both the sheet and the concrete, dried, and then the sheet was bonded to the concrete surface, or an emulsion-based adhesive was applied to the concrete surface. After applying the agent, the notebook was glued to the concrete surface and integrated.

However, the former method has the disadvantage that the adhesive must be applied to both adherends, and the latter method uses an emulsion-based adhesive whose adhesive strength decreases as the temperature rises. The drawbacks are /ζ.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the drawbacks of the prior art and to provide a method for bonding a sheet and a concrete surface which is simple and in which the adhesive strength is less likely to decrease due to an increase in temperature.

That is, the gist of the present invention is to provide a method for waterproofing a concrete surface with a polymeric material, in which an emulsion adhesive capable of cross-linking with alkali is applied to the concrete surface. The alkali content contained in the emulsion adhesive is eluted into the aqueous medium in the emulsion adhesive, and the emulsion adhesive is capable of alkali crosslinking between the concrete surface and the polymer material sheet layer without adding an alkali content in advance. This invention relates to a method for waterproofing a concrete surface with a polymer material sheet, which is characterized by providing a cross-linked layer of John-based adhesive.

Examples of the alkali-crosslinkable emulsion adhesive that can be used in the present invention include acrylic esters such as ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate, and methacrylic esters such as methyl methacrylate and ethyl methacrylate. Contains a cationic or nonionic polymer made by copolymerizing one or more monomers such as and acrylic acid with one or more monomers such as monochlorovinyl acetate, methylol acrylamide, and glycol-7-nor methacrylate. Examples include emulsion-based products.

This type of emulsion adhesive is usually Pace, J
In addition to the IJ polymer, it may contain various adjuvants such as surfactants, thickeners, tackifiers, and fillers. These auxiliary agents shall not suppress the elution of alkaline components in the concrete, nor will they interfere with the formation of a crosslinked layer of the emulsion adhesive between the concrete surface and the polymer material sheet layer. is desirable. More preferably, an acrylic emulsion adhesive containing a type in which the surfactant can promote the elution of alkaline content in concrete, and a type in which the surfactant can promote contact between the base polymer and the eluted alkali content. It is.

The sheet formed by molding the polymeric material used in the present invention includes, for example, 1. Examples include roofing sheets (hereinafter referred to as waterproof sort) specified in RTS A6008 (Synthetic Polymer Roofing), and among these, vulcanized rubber waterproof sheets are particularly preferred.

In addition, the concrete surface to which the method of the present invention is applied is made by combining cement such as ordinary Portland cement or early-strength Portland cement with aggregate such as sand or gravel eight times, adding water and mixing, and then pouring and hardening. - Examples include 7i mortar, which is made by mixing cement, sand, and water in an appropriate ratio and solidifying it.

Next, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

In the examples, the following polymer compositions and additives were used. Here, "parts" simply refer to parts by weight.

Composition A Zolaimal Jv-1126 (trade name, manufactured by Rohm and Half Co., Ltd.) Polyacrylic acid ester emulsion composition B Primal t-1736 (trade name, manufactured by Rohm and Half Co., Ltd.) Polyacrylic acid ester emulsion composition 0 Primal N -580 (trade name, manufactured by Rohm and Half Co., Ltd.) Polyacrylic acid ester emulsion additive Nopco NXZ (trade name, manufactured by Nozoko Chemical Co., Ltd.) Example 1 0 or 2 of the additive Nozoco NXZ was added to 100 parts of composition A.
parts, 3% aqueous solution of hydroquine ethyl cellulose 4
parts were added and gently mixed with finger stirring to obtain the composition of the present invention.

As an adherend, 33 parts of ordinary Portland cement and 6 parts of sand are used.
7 parts, then add an appropriate amount of water, mix, ladle into a mold, and cure at room temperature for 14 days until the surface has a smooth thickness of 1.
The obtained adhesive composition was applied to the mortar plate at a rate of 200 g/m2 using a brush at a temperature of 20°C and a humidity of 60°C.
% (for rt) for 5 to IO minutes and before completely drying, make a waterproof notebook (JIS6008 manufactured by Hitachi Cable, synthetic polymer roofing sheet that complies with vulcanized rubber waterproofing 7-T, 12mm thick). were pasted together and crimped using a hand roller. After bonding, the test piece was placed in the snow for 7 days at 20℃ and 60% relative humidity, and then heated at 20℃ and 60%.
Peel adhesive strength at 0°C was measured (180° peel). The measurement was carried out at a tensile speed of 200 mm for 7 minutes, and the values are shown as the average value of 5 test pieces. The method for measuring adhesive strength is JTS K6854 unless otherwise specified.
Compliant with. After the composition of the present invention was left for 30 days under conditions of vorticity of 20° C. and humidity of 60%, the properties and brush applicability of the composition were examined.

Example 2 A test piece was prepared under the same conditions as in Example 1 except that Composition B was used in place of Composition A used in Example 1.
This was measured.

Comparative Example 1 A test piece was prepared under the same conditions as Example 1 except that Composition C was used in place of Composition A used in Example 1.
This was measured.

Comparative Example 2 Instead of the mortar board used in Example 1, JIS
Measurements were made under the same conditions as in Example 1, using a stainless steel plate cleaned with trichlorethylene specified in K6854, and using the same composition as in Example 1 in all other respects.

Comparative Example 3 The method of Comparative Example 2 was repeated, except that Composition A plus 3 parts of sodium sesquicarbonate was used.

These results are summarized in Table 1 below.

Table 1 As is clear from this table, the adhesive layer of the present invention not only has excellent room-temperature adhesion but also exhibits excellent high-temperature peeling resistance (-7), and also exhibits no deterioration in workability over time. It has the remarkable effect of reducing the amount of water used, and its practical value is extremely important.

Claims (1)

[Claims] In a method of waterproofing a concrete surface with a sheet of polymer material, an alkali-crosslinkable emulsion adhesive is applied to the concrete surface 112, and the alkali content contained in the concrete is absorbed into the water medium in the emulsion adhesive. of a concrete surface, which is characterized by providing a cross-linked layer of an emulsion adhesive capable of alkali cross-linking between the concrete surface and the polymeric material sheet layer without adding an alkali component in advance. Polymer material sheet waterproofing construction method.