KR870001542B1 - Composition of water-proof agent - Google Patents

Abstract

This invention relates to a water proof agent for cement and mortar. Epoxy resin composition is composed of 68 wt. parts of epoxy resin, 0.5 wt. part of methylcellulose, 3 wt. parts of copolymer of alkylphenol and ethylene oxide, 1 wt. part of silicon oil and 27.5 wt. parts of water. The epoxy resin is prepd. by polymerization of epichlorohydrin and bisphenol A, and the methyl cellulose is prepd. by reaction of celluloseacetone with sodium hydroxide and dimethyl sulfate. Polyamide composition is composed of polyamide resin, silicon oil, the copolymer and water. The mixt. of the epoxy resin composition and the polyamide composition is used as a water proof agent.

Description

Waterproofing agent composition

The present invention relates to a waterproofing agent composition and a method for producing the same. More specifically, the present invention relates to a waterproofing composition for cement or mortar comprising an epoxy resin polymerized with epichlorohydrin and bisphenol A, a methylcellulose emulsifier, an antifoaming agent, and a curing agent made by reacting cellulose with an aqueous alkali solution and diethyl sulfate. .

Conventionally, various waterproofing agents are known. In other words, the method of forming a film using a pitch or asphalt roofing to waterproof the film has recently suffered from such disadvantages as the trouble of requiring hot working of the waterproof layer, poor weather resistance, and economical cost. Legal demand is gradually decreasing. As an improvement of the above method, there is also a sheet waterproofing method of forming a waterproofing layer by bonding the sheet, which is an asphalt cold work material, to the lower surface. Good, but it is difficult to increase the repair cost when cracks and defects occur on the waterproof surface of the cement. Another method is to apply synthetic rubber, resin solution, latex, etc. to the base to a certain thickness or more, and to form a waterproof layer, but this method also applies a separate waterproofing solution to form a waterproof film and cement mortar on it. There is an inconvenient point to construct.

Patent Publication No. 67-179 discloses that a p-sulfonyl-m-cresol in which sulfonic groups are introduced by sulfuric acid treatment of cresyl acid containing 40% or more of m-cresol is condensed with formalin to give poly- The leakage preventing agent formed by adding an ester, an epoxy resin and a fibrous polymer compound, a solvent, a filler, and the like has many problems such as weather resistance because it is not hygienic and is not easily mixed with cement.

Japanese Patent Publication No. 47-3639 discloses a cement waterproofing agent mainly composed of xyleneamine and higher fatty acid amide.

These waterproofing agents are expensive and are not easily and uniformly mixed with cement, and thus have a weakness in weather resistance such as cracking after a certain period of time.

Patent specification No. 79-621 discloses a waterproofing agent by mixing stearic acid and hydrated lime at 70-80 ° C., mixing hydrated lime and calcium chloride, and adding lignin sulfonate thereto. Although a waterproofing agent containing stearic acid or a derivative thereof has been widely used to date, organic waterproofing agents have a disadvantage in that they are not easily mixed with inorganic materials, and these waterproofing agents also do not exhibit a perfect waterproofing effect due to poor curability, dispersibility, and waterproofing properties.

In addition, a waterproofing agent mainly composed of polystyrene-based asphalt obtained by reacting styrene monomer with asphalt, a method of obtaining an acid-resistant waterproofing agent by treating silicon halides, esterification of phosphoric acid, mixed with low-polyvinyl alcohol, and sacrificing tallow Although a waterproofing agent that mixes a liquid with a solution of sulfuric acid treated with vegetable oil is disclosed (see Patent Publication No. 76-371, Patent Publication No. 80-505, Patent Publication; No. 80-1331, etc.). It has not been put to practical use because of poor waterproof, dispersibility and weather resistance.

The present inventors have diligently studied and studied to improve the above-mentioned shortcomings, and mainly polymerized epichlorohydrin and bisphenol A to form a polymer liquid epoxy resin having a viscosity of 11,000-14,000 centipoise and a low viscosity polyamide resin. In addition, methyl cellulose, an emulsifier, and an antifoaming agent obtained by reacting a basic compound such as cellulose, acetone, potassium hydroxide, or sodium hydroxide with dimethyl sulfuric acid, have excellent dispersibility and curability, and exhibit excellent waterproofing effect. The invention was completed. Hereinafter, the present invention will be described in more detail.

Methylcellulose obtained by reacting cellulose, acetone, and a basic compound with a polymer liquid resin having an epoxy equivalent of 184-194 and a viscosity of 11,000-14,000 centipoise was added in an amount of about 0.2-1.0% by weight to the resin, and this mixed solution To the epoxy resin was added about 2% by weight of water and stirred sufficiently. In this mixture, emulsifiers soluble in cold water and organic solvents, such as lanolin, rosin, cholesterine, lecithin, fatty acid esters of polyhydric alcohols, copolymers of alkylphenols and ethylene oxide or propylene oxide, and the like, are used in the above-mentioned epoxy resin. Add 5% by weight and stir at 800-1,200 RPM while slowly adding water to emulsify uniformly. A small amount of silicon oil is added to remove bubbles generated at this time. (The mixed solution obtained in this way is hereinafter referred to as A.)

The homogeneous mixture (A) is excellent in water resistance, chemical resistance, acid resistance, durability, etc., and shows an excellent effect as a waterproofing agent.

The epoxy resin used above is different from the conventional commercial epoxy resin, and epoxy equivalent 184-194 and viscosity 11,000-14,000 are preferred as the waterproofing agent raw material of the present invention.

Apart from the homogeneous epoxy compound (A), polyamide HO (CORCONH-CH ₂ CH ₂ NH) _n H obtained by polycondensation with dicarboxylic acid and diamines is blended into the mixture (A) to improve curability. . Such polyamide may be commercially available, but should be a low viscosity polyamide having a viscosity of 2,500-4,500 centipoise, an acidity of 2-4, and an active hydrogen equivalent weight of 90-110.

The epoxy equivalent in the epoxy resin composition (A) is blended at an active hydrogen equivalent ratio of the polyamide, and then stirred until it is uniform at a speed of 300-400 RPM while adding the emulsifier described above. In order to remove the bubbles generated at this time is carried out while adding a small amount of a defoaming agent such as silicon oil.

In order to simplify the actual construction, the polyamide composition is prepared and stored and transported separately from the epoxy resin composition (A), and then the composition (A) and the polyamide composition (hereinafter referred to as composition B) are used in combination at a ratio of 1: 1. Can be. In the production of the polyamide composition (B), 0.5-1.5 parts by weight of the emulsifier described above is added to 30 parts by weight of the polyamide, and 0.3-0.8 parts by weight of water and an antifoaming agent are added and stirred until uniform.

When commercially available polyamide is used instead of the low viscosity polyamide used above, the water-proofing agent desired in the present invention cannot be obtained. Only when the polyamide having the above-mentioned drying is used as a curing agent, the pot life is appropriate, curing of the waterproofing agent can be easily achieved at room temperature, irritant, non-toxic and excellent adhesion, and compatible with plasticizers, diluents, solvents Excellent in sex

The waterproofing agent of the present invention is mixed with an inorganic filler and mixed with a small amount of cement to be applied to the waterproof surface to reinforce the surface of the building and close the pores of the concrete to maximize the waterproofing effect.

The waterproofing agent of the present invention is a low viscosity liquid which can be easily dispersed in water, and is easily mixed with cement and uniformly penetrates into a porous surface that is easily permeable to moisture such as cement or mortar, thereby exhibiting a perfect waterproofing effect.

Example 1 (composition)

Epoxy Resin Composition (A)

Epichlorohydrin and bisphenol A are polymerized to produce an epoxy resin having an epoxy equivalent of 184-194 and a pan of 11,000-14,000 centipoise. 68 parts by weight

When the composition (A) and (B) were mixed by 1: 1 and were constructed, they were extremely superior to the conventional waterproofing agent.

Example 2 (Manufacture Example)

Preparation of Epoxy Resin Composition (A)

Epichlorohydrin and bisphenol A were polymerized to obtain a liquid epoxy resin having an epoxy equivalent of 184-194 and a viscosity of 11,000-14,000 centipoise, and ethyl cellulose obtained by reacting cellulose, acetone, and calcium hydroxide was 100 wt% of epoxy resin. 1.5 parts by weight is added to the parts, and 2 parts by weight of water are added gradually with a small amount of stirring. A copolymer of alkylphenol and propylene oxide is added thereto as an emulsifier, followed by stirring sufficiently. A small amount of silicon oil is added to remove bubbles generated at this time. After sufficient stirring, 4 parts by weight of water was added thereto, and stirred until uniform, thereby obtaining an epoxy resin composition A.

Preparation of Polyamide Composition (B)

To 100 parts by weight of a low viscosity polyamide having a viscosity of 2,5000-4,500 centipoise, an acid value of 3, and an active hydrogen equivalent weight of 90-110, 228 parts by weight of 3.5 parts by weight of a copolymer of alkylphenol and propylene oxide are added and stirred sufficiently. About 1.8 parts by weight of silicone oil is added to remove bubbles generated at this time. The polyamide composition thus produced is referred to as B.

The Example which produced the epoxy resin composition (A) and polyamide composition (B) above was mentioned, respectively. However, you may manufacture a composition (A) and (B) simultaneously as needed.

Claims (1)

65-70 parts by weight of an epoxy resin having an epoxy equivalent of 184-94 and a viscosity of 11,000-14,000 centipoise, 0.2-1.0 parts by weight of methyl cellulose, 2-5 parts by weight of an emulsifier, 0.5-2 parts by weight of an antifoaming agent, and 22.2-32.3 Epoxy resin composition (A) composed of parts by weight, viscosity 2,500-4,500, acid value 2-4, 25-33 parts by weight of low-viscosity polyamide with active hydrogen equivalent weight 90-110, defoamer 0.2-1.0 parts by weight, emulsifier 0.5 Waterproofing agent composition consisting of polyamide (B) composed of -1.5 parts by weight, 62.5-74.3 parts by weight of water.