JPH0324436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a waterproof construction method that uses an epoxy composition as a base conditioner, has excellent waterproof performance, and is effective in preventing swelling of a waterproof sheet. Typical conventional waterproofing methods to prevent swelling include the degassing method and the heavy weight pressing method. However, among these construction methods, the deaeration construction method is as follows: (1) Because it is a floating construction, if even one part of the waterproof layer is damaged, water will spread over the entire surface. (2) It is easy to create a step in the waterproof layer. (Because there is a lap part in the ventilation layer) (3) Because the adhesion to the building structure is weak, the waterproof layer is prone to peeling off due to negative pressure caused by typhoons, etc. (4) Peeling of the joint part is likely to occur due to cracks in the base. (5) Construction is complicated and expensive. (The ventilation layer and waterproof sheet must be installed twice.) (6) Ventilation is necessary, and if it is not very high-performance, water will get in. It has the following disadvantages. There are many pinholes in the concrete subsurface. The moisture contained in the base evaporates through these pinholes, causing the tarpaulin sheet to swell. According to the waterproofing construction method of the present invention, in order to apply the above-mentioned base preparation composition to the concrete base surface,
Pinholes in the concrete subsurface are sealed. When the composition for base preparation hardens, it becomes hard and also firmly adheres to the concrete base surface. This prevents moisture from evaporating from the pinhole. Therefore, blistering of the waterproof sheet can also be prevented. Further, in the heavy object pressing method, (1) weight is applied to the building frame; (2) If a variable load is applied to a heavy object, the sheet will tear. (3) Waterproofing repairs require the removal of heavy objects, which is difficult. (4) Construction is complicated and expensive. It has the following disadvantages. The inventors completed this invention as a result of intensive research into a waterproofing method that does not have the above-mentioned drawbacks. That is, the present invention is composed of an epoxy resin, a curing agent, optionally a low boiling point organic solvent, and an inorganic filler in an amount of 10 to 200 parts by weight per 100 parts by weight of the epoxy resin, and has a viscosity of 50 to 20,000 centipoise at 25°C. A method of waterproofing a concrete subsurface, which comprises uniformly applying a base conditioning composition (CP) to the concrete subsurface, curing the epoxy resin, and then pasting a waterproof sheet on the surface. It is something. The waterproofing method of this invention has excellent waterproofing performance due to its close adhesion, is easy to install, is inexpensive, and uses an epoxy resin composition, so it has high mechanical strength and strong adhesion to the base. Moreover, it has the feature of good heat resistance. In the method of the present invention, first, an epoxy resin, a hardening agent, optionally a low boiling point organic solvent, and an inorganic filler of 10 to 200 parts by weight, preferably 20 to 100 parts by weight per 100 parts by weight of epoxy resin are added to the concrete base surface. The viscosity at 25℃ is 50
~20,000 CP, and preferably the tensile Young's modulus of the cured product at 70°C is 50 Kg/cm ² or more, and is preferably applied uniformly at a rate of 0.1 to 0.5 Kg/m ² . Examples of the epoxy resins include bisphenol A type epoxy resin, hydrogenated bisphenol A diglycidyl ether resin, bisphenol A
Side chain type diglycidyl ether resin, brominated bisphenol A type epoxy resin, novolak type epoxy resin, urethane modified epoxy resin, resorcing glycidyl ether epoxy resin, glycidyl ester type epoxy resin, alicyclic type epoxy resin,
Examples include glycidylamine epoxy resin. Examples of the curing agent include aliphatic polyamines, aromatic polyamines, polyamide resins, acid anhydrides, heterocyclic amines, and mercaptans. The above-mentioned curing agent is used per reaction equivalent of epoxy resin.
It is preferable to blend 0.5 to 2 reaction equivalents, particularly 0.8 to 1.5 reaction equivalents. If the amount of the epoxy curing agent added is less than 0.5 reaction equivalent per 1 reaction equivalent of epoxy resin, the curing time at room temperature becomes longer and construction tends to become difficult, and mechanical strength, heat resistance, and adhesive strength decrease. There is a tendency to Moreover, if the amount is more than 2 reaction equivalents, curing at room temperature and pot life will be shortened, and construction will tend to become difficult. The above-mentioned inorganic filler is not particularly limited,
Examples include calcium carbonate (mechanically pulverized one is preferred because it is inexpensive), magnesium carbonate, aluminum carbonate, silica, talc, silica sand, mica powder, asbestos, and the like. The above-mentioned inorganic filler is blended in an amount of 10 to 200 parts by weight, preferably 20 to 100 parts by weight, per 100 parts by weight of the epoxy resin. If the amount of the inorganic filler is less than 10 parts by weight, the pot life will be shortened and the mechanical strength will be reduced, which is a problem in construction. Moreover, if it exceeds 200 parts by weight, it will be difficult to apply, the viscosity will increase, and the mechanical strength, heat resistance, and adhesive strength will decrease, causing problems in terms of construction and physical properties. The base preparation composition used in the method of this invention has a viscosity (as measured by a rotational viscometer) obtained by mixing the above-mentioned epoxy resin, curing agent, inorganic filler, and, if necessary, an organic solvent with a low boiling point. measured at 25℃) is 50 to 20,000CP. Examples of the low boiling point organic solvent include ketones such as methyl ethyl ketone and acetone, xylene,
Examples include hydrocarbons such as toluene, gasoline, and benzene, and methylene chloride. When blending an organic solvent, the amount of organic solvent should be 100% of the epoxy resin.
The amount per part by weight is preferably 30 parts by weight or less. If the viscosity of the base conditioning composition is less than 50CP, the workability of the composition will be poor and the anti-swelling effect will decrease;
If it is larger than 20000CP, the workability will be poor. In the method of the present invention, the above-mentioned epoxy resin base preparation composition is uniformly applied to the concrete base surface using a spatula, etc., and left to stand preferably for at least 1 hour, particularly preferably for about 3 to 50 hours, before applying the epoxy resin. After the resin is cured, a waterproof sheet such as a synthetic rubber sheet, a synthetic resin sheet, or a rubber asphalt sheet is applied to the surface of the composition for waterproofing. There are no particular restrictions on the method for attaching the waterproof sheet, and any known sheet waterproofing construction method may be employed. Examples and comparative examples are shown below. In each of the following examples, the viscosity of the composition for base preparation was measured at 25°C using a B-type rotational viscometer, and the Young's modulus of the cured product of the composition was measured using a dumbbell test using a Tensilon tensile tester. Measurements were made on the piece at 70°C and at a crosshead movement speed of 50 mm/min. Example 1 One reaction equivalent of bisphenol A epoxy resin (Epicure 828 manufactured by Yuka Ciel Epoxy Co., Ltd.) and one reaction equivalent of an aliphatic polyamine (Epicure T manufactured by Yuka Ciel Epoxy Co., Ltd.) were added, and calcium carbonate was further added. Add 50 parts by weight of powder (average particle size 25μ) per 100 parts by weight of epoxy resin and stir well until the viscosity reaches 25℃.
20000CP, tensile Young's modulus after curing is 100 at 70℃
A composition having a value of Kg/cm ² was prepared, and 300 g/m ² of this was uniformly applied to the concrete subsurface, left to harden for 24 hours, and a waterproof sheet (RA sheet SS- manufactured by Ube Industries, Ltd.) was applied. 20) for waterproofing. The results are shown in Table 1. Example 2 One reaction equivalent of bisphenol A epoxy resin (Epicote 802 manufactured by Yuka Ciel Epoxy Co., Ltd.) and one reaction equivalent of a heterocyclic amine (Epomate LX-1N manufactured by Yuka Ciel Epoxy Co., Ltd.) were added, and Add 50 parts by weight of calcium carbonate powder (average particle size 25μ) per 100 parts by weight of epoxy resin and stir well until the viscosity reaches 25℃.
1000CP, tensile Young's modulus after curing is 80 at 70℃
A composition having a value of Kg/cm ² was prepared, and 300g/cm ² of this was evenly applied to the concrete subsurface.
After leaving it for a while to harden, a waterproof sheet (RA Sheet SS-20) was pasted on top of it to make it waterproof.
The results are shown in Table 1. Example 3 One reaction equivalent of bisphenol A epoxy resin (Epicoat 802 manufactured by Yuka Ciel Epoxy Co., Ltd.), one reaction equivalent of an aliphatic polyamine (Epicure 3012 manufactured by Yuka Ciel Epoxy Co., Ltd.) and calcium carbonate powder (average Add 50 parts by weight of (particle size 25 μ) per 100 parts by weight of epoxy resin, further add 5 parts by weight of methyl ethyl ketone, and stir well to obtain a particle size of 500CP at 25℃ and a tensile Young's modulus of 80Kg/cm ² at 70℃ after curing. Prepare a composition showing the value and apply it to the concrete base surface per 1 m ²
300g of it was applied evenly and left to harden for 24 hours, and a waterproof sheet (RA Sheet SS-20) was pasted on top of it for waterproofing. The results are shown in Table 1. Comparative example 1 Asphalt primer (JASS-8 standard product)
Apply 300g per ^1m2 evenly to the concrete base surface, leave it for 24 hours, and then apply a waterproof sheet (RA).
Waterproofing was carried out by pasting sheet SS-20). The results are shown in Table 1. Examples 1, 2, and 3 and Comparative Example 1 were observed for six months. The results are shown in Table 1. 【table】

Claims (1)

[Claims] 1. Epoxy resin, curing agent, optionally low-boiling organic solvent and 10 to 100 parts by weight of epoxy resin.
A base conditioning composition containing 200 parts by weight of an inorganic filler and a viscosity of 50 to 20,000 centipoise (CP) at 25°C is uniformly applied to the concrete base surface, and the epoxy resin is cured. , a waterproofing construction method for concrete subsurface surfaces, which is characterized by pasting a waterproof sheet on the surface.