KR100657020B1 - Water Soluble Asphalt Waterproofing Agent For Waterproofing Film Formation - Google Patents

Abstract

A water-soluble asphalt-based waterproofing agent for forming a waterproof coating film having excellent performances such as water resistance and strength is disclosed. The waterproofing agent has an acid value of 120 to 210 mgKOH / g, and polymerizes a monomer mixture having an alkali-soluble neutralized styrene / acrylic resin, a monomer having an alkyl group, and an aceto group, and then adding a substance having a diamine group to prepare a room temperature crosslinking emulsion. 10 to 70% by weight resin and 30 to 90% by weight emulsified asphalt. The waterproofing agent having such a composition provides a crosslinking performance in the water-soluble asphalt-based waterproofing film to be formed, thereby shortening the internal drying time and forming a waterproofing coating having excellent chemical and physical performances such as water resistance and strength.

Description

Water-soluble asphalt-type waterproof agent for forming waterproof layer}

The present invention relates to a waterproofing agent, and more particularly, to a water-soluble asphalt-based waterproofing agent for forming a waterproofing coating that can form a waterproofing coating.

In general, the waterproofing agent refers to a composition in which a waterproofing agent in an aqueous or oily liquid form is applied to a surface to obtain a waterproofing effect using a remaining film after evaporation of water or a solvent. The waterproofing agent is generally used for external waterproofing of construction and civil engineering structures, waterproofing of retaining walls or ceilings of underground structures, and indoor waterproofing of toilets, bathrooms, verandas, and the like.

The waterproofing agent is classified into an emulsion type mainly composed of rubberized asphalt, acrylic rubber or acrylic resin, and a reactive type containing chloroprene or chlorosulfonated polyethylene and having a urethane or epoxy resin as a main component. Among these, emulsion type rubberized asphalt waterproofing agents and reactive urethane waterproofing agents are mainly used.

In particular, the rubberized asphalt-based waterproofing agent includes at least one of a styrene-based polymer, ethylene-vinyl acetate, or styrene-butadiene latex in the asphalt, and characteristics such as excellent elongation, crack resistance, cold resistance, and bondability that the asphalt does not have It is formed by modifying to have. In addition, a surfactant or a curing accelerator may be added to further enhance the heat resistance, strength, and hardness of the asphalt, and may be formed by adding a thermoplastic elastomer.

At this time, the rubberized asphalt-based waterproofing agent is classified into water-soluble and oily, but the oil-based waterproofing agent has a problem of environmental pollution. That is, the oil-based rubberized asphalt-based waterproofing agent contains toluene, etc. as a solvent, the toluene causes pollution problems as environmental pollutants. In addition, when moisture remains on the surface of the coating material, the penetration force is weak, causing the oily rubberized asphalt-based waterproofing agent to be inferior in adhesive strength.

Therefore, the water-soluble rubberized asphalt-based waterproofing agent which is more environmentally friendly than the oil-based rubberized asphalt-based waterproofing agent which can be applied even when the surface of the coated material has a large amount of water is generally used.

In order to form a waterproof coating using the water-soluble rubberized asphalt-based waterproofing agent, first, by applying a water-soluble rubberized asphalt-based waterproofing agent using a brush, roller or spray to a place where the waterproofing film is to be formed, a preliminary waterproofing film To form. Subsequently, moisture contained in the water-soluble rubberized asphalt waterproofing agent is naturally dried to form a waterproof coating film.

However, it takes about 24 hours until the moisture is completely dried to harden to form the waterproof coating film has a problem that the construction process is delayed because the subsequent process input is late. In particular, when rain falls within 24 hours (curing time) after construction, the waterproofing agent is dissolved in water, causing trouble of re-installation due to breakage of the waterproofing layer. In addition, it is difficult to use the water-soluble waterproofing agent because it is hard to evaporate moisture in a cold region, and in order to maintain a constant thickness, two to five repetitive constructions are performed because the waterproof coating film applied flows down in a hot region. It is difficult to apply because there is a problem depending on the temperature and climate conditions, such as need.

That is, since the water-soluble asphalt-based waterproofing agent for forming a waterproofing coating film forms a thermoplastic waterproofing coating in which the drying rate of the coating is determined according to the rate of evaporation of water, in particular, poor drying occurs in a construction site having a very high humidity or a low temperature. In addition, the case where the surface or the internal drying for forming the waterproof coating film is delayed is the situation causing the greatest delay in construction.

An object of the present invention is to provide a water-soluble asphalt-based waterproofing agent capable of shortening the internal drying time and forming a waterproof coating with improved water resistance and strength.

In order to achieve the above object, the water-soluble asphalt waterproofing agent for forming a waterproof coating film of the present invention has an acid value of 120 to 210 mgKOH / g, and polymerized a monomer mixture having an alkali-soluble neutralized styrene / acrylic resin, a monomer having an alkyl group, and an aceto group. After that, 10 to 70 wt% of the room temperature crosslinkable emulsion resin prepared by adding a substance having a diamine group and 30 to 90 wt% of the emulsified asphalt.

As an example, the emulsified asphalt may be cationic emulsified asphalt, anionic emulsified asphalt, nonionic emulsified asphalt, or the like. In particular, the water-soluble asphalt-based waterproofing agent may include 20 to 60% by weight of the room temperature cross-linked emulsion resin and 40 to 80% by weight of the emulsified asphalt.

The water-soluble asphalt-based waterproofing agent having the above-mentioned composition may include a room temperature crosslinkable emulsion resin in a waterproof coating film to be formed to form a crosslinked structure, thereby reinforcing water resistance, adhesiveness with the bottom, and strength. Therefore, the waterproof coating film which can shorten an internal drying time can be formed. In addition, by adding the modified emulsified asphalt, it is possible to form an asphalt-based waterproof coating film having excellent chemical and physical performances such as water resistance, rust resistance and adhesion.

Hereinafter, the water-soluble asphalt-based waterproofing agent for forming a waterproof coating film of the present invention will be described in detail.

The water-soluble asphalt-based waterproofing agent for forming a waterproof coating film of the present invention has a composition including a room temperature cross-linkable emulsion resin and emulsified asphalt.

The room temperature crosslinkable emulsion resin applied to form the water-soluble asphalt-based waterproofing agent neutralizes a resin soluble in a styrene / acrylic alkali having an acid value in the range of 190 to 210 mgKOH / g with a neutralizing agent and a monomer mixture having a monomer and an aceto group. After the polymerization, a substance having a diamine group is added to prepare it.

When the amount of the styrene / acrylic resin is less than 10% by weight, the particle size of the emulsion resin is increased while the stability between emulsion particles is poor. On the other hand, when the amount of use exceeds 40% by weight, the particle size of the emulsion resin is reduced, the viscosity and acid value is increased, so that the water resistance and alkali resistance is weak. Therefore, the styrene / acrylic resin preferably uses about 10 to 40% by weight of the total weight of the monomer having an alkyl group. Specific examples of the resin soluble in the styrene / acrylic alkali include J.C. Joncryl-67, which has an acid value of 200, is available from Johnson.

In addition, examples of the neutralizing agent used for neutralizing the styrene / acrylic resin include aqueous ammonia solution, sodium hydroxide and the like.

The monomer mixture used for the polymerization includes a monomer having an aceto group and a monomer having an alkyl group. Examples of the monomer having an aceto group include diacetone acrylamide, acetoacetoxy acrylate, acetoacetoxyethyl methacrylate, and the like, and may be used alone or in combination of two or more thereof.

In addition, examples of the monomer having an alkyl group include methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, butyl acrylate, styrene, methacrylic acid ester, and ethyl acrylate ester. And butyl acrylate ester etc. are mentioned, It is similarly used individually or as a mixture of 2 or more types.

At this time, when the amount of the monomer having an aceto group is less than 0.1% by weight, the crosslinking structure does not occur well. When the amount of the monomer having an aceto group exceeds 10% by weight, the amount of unreacted residue during polymerization increases, and the unreacted residue subsequently forms a tee with an initiator. The appearance of the resin becomes poor. Therefore, the amount of the monomer having an aceto group is preferably used from about 0.1 to 10% by weight of the amount of the monomer having an alkyl group. A polymerization initiator may be added thereto, and the polymerization initiator used may include, for example, ammonium persulfate, potassium persulfate, and the like. The addition amount of the polymerization initiator is used up to 0.05 to 3% by weight based on the monomer having an alkyl group.

As the material having the diamine group, ethylenediamine, hexamethylenediamine, hydrazine, adipic dihydrazide, and the like may be used. The addition of the material having the diamine group converts the aceto groups in the emulsion particles into the enol form through keto-enol totomism with the evaporation of water at room temperature. At this time, two molecules of the aceto group converted to the enol form react with one molecule of a substance having a diamine group, thereby forming two molecules of water to form an enamine crosslink. Therefore, the crosslinking performance is imparted to the waterproof coating film formed of the water-soluble asphalt-based waterproofing agent for forming the waterproof coating film.

Here, when the content of the room temperature cross-linked emulsion resin contained in the waterproofing agent to be formed is less than 10% by weight, the crosslinking performance imparted to the existing asphalt-based waterproof coating is lowered. On the other hand, when the content exceeds 70% by weight, the ductility, waterproofing, rust prevention and adhesion performance of the asphalt is significantly reduced, and economically ineffective.

Therefore, the water-soluble asphalt-based waterproofing agent contains 10 to 70 wt% of the room temperature crosslinkable emulsion resin, and preferably contains 20 to 60 wt%.

Examples of the emulsified asphalt include cationic emulsified asphalt in which the emulsifier has a positive charge, anionic emulsified asphalt in a negative charge, and nonionic emulsified asphalt having neither of positive or negative charges. In addition, cationic, anionic and nonionic emulsified asphalt may be used in which the emulsified asphalt is modified with synthetic rubber latex and natural rubber latex.

When the content of the emulsified asphalt applied to form the waterproofing agent to be formed is less than 30% by weight, the ductility, waterproofing, rustproofing and adhesion performance of the asphalt are significantly reduced. On the other hand, when the content of the emulsified asphalt exceeds 90% by weight, physical performance such as mechanical strength is significantly reduced.

Therefore, the water-soluble asphalt-based waterproofing agent contains 30 to 90% by weight of the emulsified asphalt, and preferably contains a content of 40 to 80% by weight.

Hereinafter, the water-soluble asphalt-based waterproofing agent will be described in detail through specific examples and evaluation examples of the present invention. However, the present invention is not limited to the following examples and evaluation examples.

Example

487.7 g of ion-exchanged water, 120 g of Joncryl-67, and 10.3 g of an aqueous ammonia solution were added to the 2 L flask, and Joncryl-67 was dissolved while maintaining the temperature at 60 ° C. After confirming that the solution was completely dissolved, the temperature was raised to 80 ° C, and 1 g of ammonium persulfate as a polymerization initiator was dissolved in 10 g of ion-exchange water. Thereafter, a monomer mixture of 150 g of styrene monomer and 50 g of n-butylacrylate was added dropwise for 2 hours. Subsequently, a monomer mixture of 50 g of styrene monomer, 90 g of n-butyl acrylate, 60 g of methyl methacrylate, and 4 g of diacetone acrylamide and an aqueous solution of 1 g of ammonium persulfate dissolved in 100 g of ion-exchanged water were simultaneously added dropwise for 3 hours. After completion of the dropwise addition, the reaction was maintained for 1 hour and then cooled to 50 ° C. or less, 5 g of ammonia aqueous solution and 2 g of adipic dihydrazide having a diamine group were dissolved in 13 g of ion-exchanged water to synthesize a room temperature crosslinkable emulsion resin.

300 g of emulsified asphalt was added to a 1 L flask and 200 g of the synthesized room temperature crosslinkable emulsion resin was slowly added while stirring using a stirrer to obtain a water-soluble asphalt waterproofing agent.

Evaluation of Waterproofing Film of Water Soluble Asphalt Waterproofing Agent

The water-soluble asphalt-based waterproofing agent and the emulsified asphalt prepared in the above Examples were respectively coated on a slate plate to a thickness of 0.01 to 2 mm to obtain a waterproof coating film. In addition, drying time was measured for each waterproof coating film specimen. The results are shown in Table 1 below.

TABLE 1

Oil painting asphalt Example Dry touch 4 hours 2 hours Solidification 24 hours 10 hours

Referring to Table 1, as can be seen from the drying time evaluation results of the embodiment, the obtained water-soluble asphalt-based waterproofing agent reduced the drying time by about two times or more compared with drying after forming a waterproof coating film using only conventional emulsified asphalt. Had the effect of. This seems to result in the formation of the crosslinked structure of the emulsion resin by shortening the drying time by mixing the emulsion resin.

The water-soluble asphalt-based waterproofing agent having the above-mentioned composition may include a room temperature crosslinkable emulsion resin in a waterproof coating film to be formed to form a crosslinked structure, thereby reinforcing water resistance, adhesiveness with the bottom, and strength. Therefore, the waterproof coating film which can shorten an internal drying time can be formed. In addition, by adding the modified emulsified asphalt, it is possible to form an asphalt-based waterproof coating film having excellent chemical and physical performances such as water resistance, rust resistance and adhesion.

As such, it is possible to solve the problem of delay in the construction period due to the very slow internal drying time of the water-soluble asphalt-based waterproofing agent used in the construction civil engineering and the physical performance of the water-soluble thermoplastic coating at the same time. It can be performed quickly and effectively for indoor and construction waterproofing.

  Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. I can understand that you can.

Claims (3)

10 to room temperature crosslinking emulsion resin prepared by polymerizing a monomer mixture having an acid value of 120 to 210 mgKOH / g, an alkali-soluble neutralized styrene / acrylic resin, a monomer having an alkyl group, and a monomer having an aceto group, and then adding a substance having a diamine group. Water-soluble asphalt-based waterproofing agent for forming a waterproof coating film comprising 70% by weight and emulsified asphalt 30 to 90% by weight. The water-soluble asphalt-based waterproofing agent according to claim 1, wherein the emulsified asphalt is at least one selected from the group consisting of cationic emulsified asphalt, anionic emulsified asphalt, and nonionic emulsified asphalt. The water-soluble asphalt-based waterproofing agent according to claim 1, comprising 20 to 60% by weight of the room temperature crosslinkable emulsion resin and 40 to 80% by weight of the emulsified asphalt.