JPS6227866B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a coating film waterproofing construction method using an acrylic resin emulsion, and more particularly to a waterproofing construction method using a multilayer coating film using two types of emulsions. Furthermore, the present invention provides a surface of an object to be waterproofed;
In other words, the present invention relates to an excellent waterproofing construction method that can apply a waterproof coating film having high design quality and excellent durability to surfaces such as roofs and walls of buildings without causing any pollution. Various waterproofing methods have been developed for the purpose of waterproofing buildings. Among these waterproofing methods, the coating film waterproofing method allows the formation of a continuous waterproof cedar film on-site, so it is difficult to apply to complex-shaped parts of buildings or molded materials such as waterproof sheets. It is highly regarded and applied as the most suitable method for waterproofing difficult wall surfaces. Materials used in the coating film waterproofing method include solution-type or solvent-free types made mainly of asphalt, polyurethane resin, epoxy resin, etc., various synthetic rubbers, vinyl acetate, styrene, vinyl chloride, and acrylic esters. There are emulsion-type products that use synthetic resins obtained by polymerizing. Among these, asphalt waterproofing is
Polyurethane and epoxy resins have extremely poor flexibility, making it difficult to obtain a coating with the desired performance unless careful consideration is given to the hardening agent, and there are problems with workability such as odor and the need to be careful about fire. There are some drawbacks, and the coating film has poor followability to cracks in the base. On the other hand, synthetic resin emulsion-based waterproof coating materials are water-based, so they are easy to work with, and
Since most of them are pre-prepared one-component materials, they are characterized by stable coating film properties. Among them, acrylic emulsion type coating waterproofing agents, which are mainly made from acrylic resin, have excellent weather resistance and can obtain appropriate flexibility by selecting the constituent acrylic ester or methacrylic ester. It can be said to be an excellent coating film waterproofing agent because it provides a coating film that has excellent followability to substrate cracks and has excellent water resistance and alkali resistance. As mentioned above, acrylic emulsion-type paint film waterproofing agents have been widely used due to their excellent properties, but more recently acrylic emulsion type paint film waterproofing agents have been used, which give a more flexible paint film, from the perspective of emphasizing substrate crack followability. There has been a strong demand for emulsion type coating film waterproofing agents. Here, the ability to track base cracks refers to cracks in the base coated with a waterproof coating that occur due to hardening and shrinkage of concrete, etc. after the waterproof coating is applied, without causing the waterproof coating to break. refers to the ability to flexibly follow the elongation caused by This property is required to be met by the coating film being flexible and not hardening even under low temperature conditions in winter, and for this reason, the coating film is required to have high flexibility. As described above, the flexibility of waterproof coatings is an important property and is strongly desired for highly reliable waterproofing construction, but simply pursuing flexibility may lead to several weaknesses and new problems. A problem occurs. In other words, for acrylic paint film waterproofing agents,
There is a correlation between the flexibility and adhesion of the coating film.
The more flexible the coating, the more sticky it becomes and the more likely it is to get dirty.Furthermore, increasing flexibility reduces its resistance to mechanical impacts such as punching, sticking, and friction. There is. Japanese Patent Publication No. 49-16352 discloses an acrylic coating waterproofing agent that is strong against mechanical shock and has low stickiness while retaining flexibility by blending various additives with acrylic resin. However, even with such excellent waterproof materials, the above-mentioned problems arise under long-term exposure conditions, leaving unresolved problems. It is something that cannot be obtained. Conventionally, as a countermeasure against this problem, a waterproofing method has been implemented in which a layer for protecting the flexible waterproof coating film, that is, a protective layer is provided on top of the flexible waterproof coating film, and the waterproofing film and the protective layer are multilayered. Generally, the materials used for the protective layer are (1)
Mortar or resin mortar (2), which is mainly made of Portland cement and also uses sand and sometimes polymer emulsion (2) Various paints have been used, but it cannot be said that any of them are fully satisfactory. . This is because cement-based materials such as mortar and resin mortar do not have sufficient adhesion with the waterproof layer, and the protective mortar layer often peels off or lifts.In rare cases, materials with good adhesion However, in the case of hard materials such as cement-based materials, the ability of the waterproofing membrane to follow cracks will be significantly impaired, because if cracks occur in the building base, cracks will subsequently develop in the upper mortar protective layer. As a result, the waterproof layer is subjected to zero spantation from above and below, significantly reducing the crack tracking performance of the waterproof layer. Here, zero spanstation refers to a state in which tensile stress is applied to the waterproof membrane due to cracks generated in the base. For solvent-based and water-based protective paints,
In some cases, the adhesion with the waterproof membrane is insufficient, requiring an adhesion intermediary layer between the waterproof membrane and the protective layer, or the flexibility of the protective agent is inadequate, causing the waterproof membrane to fail in the same way as cement-based protective agents. Decreases crack tracking performance. In addition, it is difficult to apply a thick coating using a solvent-based material, and therefore it is difficult to obtain a protective layer thick enough to protect the waterproof membrane against mechanical impact. The present inventors have proposed that acrylic coating film waterproofing agent be used as a protective material in a waterproofing construction method, which has good weather resistance, does not reduce the crack followability of the waterproofing film, and provides good protection of the waterproofing film against mechanical shock. As a result of intensive research to obtain the right materials, we completed this waterproofing construction method. That is, the present invention applies an emulsion containing an acrylic resin with a glass transition temperature of -20°C or lower to the surface of an object to be waterproofed to form a coating film,
Then, the glass transition temperature is -10℃ or higher on the coating film.
The present invention relates to a waterproof construction method characterized by forming a coating film by applying a cationic emulsion containing an acrylic resin at a temperature of 20°C or less. The coating film obtained from the cationic emulsion containing an acrylic resin with a glass transition temperature of -10°C or higher and 20°C or lower, which is used in the waterproofing method of the present invention, functions as a protective layer and has good adhesion to the waterproofing film. Because of its excellent properties, it does not require an adhesive intermediary layer and does not peel off over a long period of time. In addition, by selecting an appropriate flexibility for the resin used, the crack followability of the waterproof membrane is not degraded, and the waterproof membrane is well protected against mechanical damage. In addition, since the resin is an acrylic resin with excellent weather resistance, it has excellent long-term durability. Next, the constituent components used in the present invention will be specifically described. The acrylic resin in the present invention refers to one or more of acrylic esters and methacrylic esters.
It is a polymer obtained by polymerizing a monomer or a monomer mixture containing 20 to 100%, preferably 40 to 100%, particularly preferably 70 to 100%, by a normal polymerization method, and is generally an acrylic resin. It comprehensively includes what is said to be. Specific examples of the above acrylic esters and methacrylic esters include methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, n-amyl, iso- amyl, n-hexyl,
n-heptyl, oxoheptyl, n-octyl,
Examples include esters such as 2-ethylhexyl, n-nonyl, oxononyl, n-decyl, and oxodecyl. In addition to the above-mentioned acrylic acid alkyl esters, there are vinyl monomers that can be copolymerized with acrylic esters and methacrylic esters as monomers constituting acrylic resins, and specifically, acrylic acid or Methacrylic acid, ethylene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, styrene, butadiene, acrylamide, methylol acrylamide, vinyl propionate, itaconic acid and its esters, maleic acid and its esters, crotonic acid and its esters, etc. is used. If the content of acrylic acid ester and methacrylic acid ester as constituent monomers of the acrylic resin used in the present invention is less than 20%, there is a drawback that the weather resistance of the resin itself decreases. Furthermore, by copolymerizing acrylic acid, methacrylic acid, or other monomers, the toughness of the coating film can be improved and the coating film can be made less likely to crack. On the other hand, if the amount of acrylic acid, methacrylic acid, or other monomers is too large, the flexibility of the coating film will decrease, the ability to follow cracks in the structure will decrease, and the waterproof function will tend to decrease. Of course, this also causes problems with the weather resistance. The glass transition temperature (hereinafter referred to as Tg point) of the acrylic resin used in the present invention is the temperature at which various properties of the amorphous polymer suddenly change. Below this temperature, the motion of the molecular segments of the amorphous portion of the polymer is frozen. The temperature is such that To actually measure the Tg point of the resin used in the present invention, for example, the thermal expansion at various temperatures is measured, the specific volume is plotted for each temperature, and the resulting curve is bent. A common method for determining the temperature at a point is used. However, in practice, if the Tg point value of a resin made of each single monomer is known, the Tg point value of a copolymer resin can be determined by the following formula. 1/Tg=W ₁ /Tg ₁ +W ₂ /Tg ₂ +……+W _o
/Tg _o W ₁ : Weight fraction of component 1. W ₂ : 〃 of component 2. W _o : weight fraction of component n. Tg ₁ : Glass transition temperature of component 1 single polymer
(〓) Tg ₂ :〃 2〃 (〓) Tg _o :〃 n 〃 (〓) Here, W ₁ +W ₂ +...+W _o =1. The Tg points of the main known individual resins (all Tg points in the arc) are polymethyl acrylate (8℃), polybutyl acrylate (-54℃), and poly2-ethylhexyl acrylate (-55℃). ,
Polymethyl methacrylate (105℃), polystyrene (100℃), polyvinyl acetate (30℃), polymethacrylic acid (130℃), etc. Next, an example of calculating the Tg point of a copolymer resin is shown. The Tg point of a copolymer resin containing 70 parts by weight of butyl acrylate (hereinafter abbreviated as parts) and 30 parts of styrene is -23°C when calculated from the above formula. The method for determining the Tg point has been explained above, but the Tg point of the resin used in the coating film waterproofing agent in the present invention is
The point is determined from the above formula and the Tg point (for those not listed, refer to the Chemical Handbook published by Maruzen Co., Ltd.). The waterproofing construction method of the present invention relates to a waterproofing construction method using a multilayer coating film using two types of emulsions, and is characterized by providing a multilayer coating film of a waterproofing film and a protective layer (protective coating film). . In the present invention, the emulsion used to form the waterproof membrane is an emulsion containing an acrylic resin having a Tg point of -20°C or lower. The reason why an acrylic resin with a Tg point of -20°C or less is used as the acrylic resin used in the waterproof membrane is that it does not cause cracks or cracks even if it is applied thickly at one time. This is because using a soft acrylic resin with a Tg point of -20°C or lower is an essential requirement from the perspective of waterproofing the surface of a building, in order to prevent water leakage due to rainwater etc. by creating a uniformly thick film. It is from. If a hard resin with a Tg point higher than -20 is used and the film thickness is several hundred microns or more, troubles such as cracks and crazing will inevitably occur during film formation; Water leaks from the membrane, and even if it is coated thickly, it will not be able to fully demonstrate its performance as a waterproof membrane. The second reason for using a soft resin with a Tg point of -20° C. or lower in the present invention is to provide followability to cracks in the base. In other words, because the resin itself is soft, even if cracks of a few millimeters occur in the base due to movement of buildings, the coating film applied on top of it can easily fill the cracks in the base without causing pinholes or cracks. Follow. If a resin with a Tg point higher than -20°C is used, it will not be able to follow cracks and will not be able to follow the normally occurring cracks of about 0.3 mm (called hair cracks), resulting in cracks, etc., eventually causing water leakage. Furthermore, when a resin with a Tg point of -20°C or lower is used, it retains its coating properties well even at low temperatures and has excellent film-forming performance, making it ideal for waterproof coatings. . Acrylic resins with a Tg point of -20°C or less are obtained by polymerizing acrylic esters and methacrylic esters as described above, but the acrylic resins used in the waterproof membrane of the present invention have a carbon number of 3. Those obtained by polymerizing acrylic acid alkyl esters having from 10 to 10, more preferably from 4 to 9 alkyl groups are preferred. By using an acrylic acid alkyl ester having an alkyl group with 3 to 10 carbon atoms, it has the characteristics of a waterproof membrane, such as maintaining flexibility at low temperatures and not cracking even when applied thickly. It can be further enhanced by using an acrylic acid alkyl ester having an alkyl group having 4 to 9 carbon atoms. Note that if a material with less than 3 carbon atoms is used, problems may occur with the water resistance and flexibility of the coating.
When using a material exceeding the above range, problems may arise in the strength of the coating film. The emulsion containing the acrylic resin used in the present invention can be easily obtained by polymerizing the monomers in a conventional manner using a known emulsifier, and the solid content concentration of the resulting emulsion is usually
It is done so that it becomes 30-70%. In addition, it is preferable that the PH value of this emulsion is 7 to 10 from the viewpoint of stability, and the PH value of the emulsion should be adjusted using ammonia, water-soluble amine, sodium hydroxide, potassium hydroxide, etc. is preferred. However, even in a weakly acidic or acidic region, an emulsion with good stability can be fully utilized as is for the purpose of the present invention. In the present invention, aggregates, short fibers, thickeners, surfactants, viscosity stabilizers, antifoaming agents, etc. are added to the emulsion containing the acrylic resin having the above composition in a conventional manner to form a paint film waterproofing agent. do. Examples of aggregates that can be used include talc, mica, acid clay, diatomaceous earth, kaolin, quartz, silica sand, cold water sand, iron powder, fly ash, satin white, titanium oxide, ferrite, lithopone, baryta, wood powder, and zirconia. , perlite, vermiculite,
These include shirasu balloons, carbon black, bentonite, calcium carbonate, white carbon, and various cements such as portland cement, blast furnace cement, and alumina cement. Although coarse aggregates with a particle size of 1 mm or less can be used, it is usually preferable to use aggregates with a particle size of 100 μm or less. In addition, as short fibers, inorganic fibers, natural fibers, or synthetic fibers can be used, and specific examples include:
Asbestos, rock wool, glass wool, slag wool, pulp, polyethylene fiber, polyvinyl chloride fiber, vinylon fiber, nylon fiber, acrylic fiber, polyester fiber, cotton, hemp, etc. are used. As the thickener, modified cellulose such as methyl cellulose and hydroxyethyl cellulose, polysaccharides, polyethylene oxide, polyvinyl alcohol, water-soluble polyacrylates, polyacrylamide, alkali-thickened polyacrylate, etc. are used. Surfactants are used to improve the dispersibility of aggregates, and examples of such surfactants include ethers such as alkyl of polyoxyethylene and alkylphenol, sorbitan fatty acids of polyoxyethylene, etc. and oxyethylene-oxypropylene block polymers. As the viscosity stabilizer, for example, soda, potash, ammonium salts such as ligninsulfonic acid, polyacrylic acid, polymethacrylic acid, and tripolyphosphoric acid are used. Further, antifoaming agents include octyl alcohol, caprylic alcohol, lauryl alcohol, and cyclohexanol. The emulsion used to form the protective coating film that is the protective layer of the waterproof film in the present invention has a Tg point of -10°C or above 20°C.
It is a cationic emulsion containing an acrylic resin at a temperature of 0.degree. C. or less, preferably -10.degree. C. or more and 10.degree. C. or less. The reason for using an acrylic resin with a Tg point of -10°C or more and 20°C or less as the acrylic resin used in the protective layer is that it does not inhibit the above-mentioned ability to follow the base cracks of the waterproof layer, and that it has good impact resistance as a protective layer.
This is to maintain good design. If a hard resin with a Tg point higher than 20°C is used, cracks will occur in the building base, the protective layer will also crack, and the waterproof membrane will undergo zero spuntation on the top and bottom surfaces, causing cracks. This significantly limits the waterproof performance of the waterproof membrane.
In addition, if a flexible acrylic resin with a Tg point lower than -10°C is used, the adhesiveness will increase significantly, dirt and dust will easily adhere to it, and the surface will lack aesthetic properties as a protective layer. It also lacks impact resistance. Acrylic resins with a Tg point of -10°C or higher and 20°C or lower are obtained by polymerizing acrylic esters and methacrylic esters as described above.
The acrylic resin used in the protective layer of the present invention is preferably one obtained by polymerizing an acrylic acid alkyl ester having an alkyl group having 3 to 10 carbon atoms. The reason for using an acrylic acid alkyl ester having an alkyl group having 3 to 10 carbon atoms is the same as the above-mentioned reason for the waterproof film, but since it is used on the surface as a protective layer, weather resistance and water resistance are particularly strongly required. Therefore, it is preferable to increase the content of acrylic acid alkyl ester, and when combined with methacrylic ester, it accounts for 40% or more of the monomer,
Furthermore, it is particularly preferable to set it to 70% or more. In addition, since water resistance is required as a protective layer,
It is better to avoid using unsaturated carboxylic acids such as acrylic acid and methacrylic acid as monomers constituting the acrylic resin, and even if they are used, it is preferable to keep the amount to a minimum. The emulsion containing the acrylic resin that forms the protective layer must form a coating film with excellent adhesion to the waterproof film, and this property can only be obtained by making the emulsion cationic. It is. The cationic emulsion can be produced by the conventional emulsion polymerization of the monomers in the presence of a cationic surfactant, or by the conventional emulsion polymerization in the presence of a nonionic and/or anionic surfactant. There is a method of producing an emulsion with a solid content concentration of 30 to 70% by adding and mixing a cationic surfactant to an emulsion obtained by emulsion polymerization. The cationic surfactants used include generally commercially available secondary and tertiary amine type surfactants,
Although a quaternary ammonium salt type surfactant can be used, it is preferable to use a quaternary ammonium salt type cationic surfactant, which further improves the adhesion to the waterproof membrane. Specific examples of quaternary ammonium salt type surfactants include lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, alkylbenzyldimethylammonium chloride, and lauryldimethylbenzylammonium chloride. A cationic emulsion containing an acrylic resin with a Tg point of -10°C or higher and 20°C or lower may contain aggregates, short fiber thickeners, as well as coating film waterproofing agents, if necessary.
Add surfactants, viscosity stabilizers, and antifoaming agents to use as a protective agent for waterproof coatings. Since the protective layer of the present invention is applied to the surface of the waterproof membrane, coarse aggregate and fine bone are used in the present invention to prevent slipping when walking, to give a matte finish, or to give a stucco-like appearance to walls. It is preferable that the protective agent is used in combination with the protective agent. Coarse aggregates include silica sand No. 5, silica sand No. 6, and silica sand No. 7.
It is preferable to use talc, titanium oxide, kaolin, etc. as the fine aggregate. When using coarse aggregate and fine aggregate together, the ratio is 60:
The ratio is preferably 40-95:5, more preferably 70:30-90:10. If there is too little coarse aggregate, the surface cannot be roughened, and if there is too much, it is difficult to form a dense film. As for the amount of aggregate added, preferably the resin content is 5 when the total of resin and aggregate is 100.
A good amount is ~40%, more preferably 15-25% by weight. If the resin content is too low, the film-forming properties will be insufficient; if it is too high, the resin may separate, resulting in poor design or slipping, making it unsuitable as a surface protection agent. be. Preferred thickening agents when used as a protective agent include modified celluloses such as methyl cellulose and hydroxyethyl cellulose, and it is also preferable to use an alkyl styrene-propylene oxide block copolymer as a leveling agent. The coating film waterproofing agent and protective agent according to the present invention can be colored freely, and common dyes and pigments can be used as the coloring agent. Next, the construction method of the waterproofing method of the present invention will be explained. The coating film waterproofing agent is applied to the surface of the structure to be waterproofed by applying it with a brush or roller, or spraying it with a spray gun to form a coating film. The viscosity of the waterproofing agent is 300 cps or more (B type viscometer,
30 rpm, rotor No. 2, 20° C.), and more preferably about 1,000 to 50,000 cps, depending on the coating method. If the viscosity is less than 300 cps, the leveling property will be too high and it will be difficult to apply a thick layer at once.
When the viscosity is too high, problems tend to occur during coating. The coating amount of the coating film waterproofing agent is preferably adjusted so that the film thickness after formation is 300μ or more, more preferably 500 to 3000μ. If the film thickness is too thin, the ability to follow cracks in the base will decrease, causing water leakage.If the film thickness is increased, the ability to follow the above will be improved and cracks and cracks will be eliminated, but if the film is too thick, it will not respond to such problems. No improvement in effectiveness was observed. In addition, when using a coating film waterproofing agent, in the joints and large gaps of the structure to be waterproofed, fill in the gaps in advance with a sealant, mortar, and cement mixture mixed with resin emulsion. It is also a preferable method to bury the area and then apply a waterproofing agent. It is also possible to apply a base treatment agent to the frame in advance and then apply a coating film waterproofing agent. Examples of the surface treatment agent include epoxy resin emulsion, general commercially available emulsion type, solvent type paint, adhesive, and the like. The objects to which the coating film waterproofing agent can be applied, that is, the objects to which the waterproofing method of the present invention is applied, are general buildings and building materials, such as concrete, mortar, lightweight materials such as ALC boards and gypsum boards, It covers a wide variety of materials, including metals such as iron plates and aluminum, plywood, and other wood materials. After forming the waterproof membrane, a protective agent is subsequently applied. The application method is the same as that of the paint film waterproofing agent, and the viscosity is adjusted in the same way and it is applied by spraying, brushing, roller coating, etc. The thickness of the protective layer is the same as that of the waterproof membrane in terms of resistance to mechanical damage, that is, preferably 300μ or more, more preferably 500 to 3000μ. In addition, when the purpose is to give a design to a wall surface, etc., it is possible to use paper patterns, joint tape, etc., or a design roller, etc. Furthermore, oil-based or water-based paints may be applied to the surface of the protective layer in order to impart various properties. The coating film formed by the waterproofing method of the present invention is
It is possible to create three-dimensional patterns with excellent aesthetic appearance, and the coating film has no stickiness on the surface, and is waterproof, weather resistant, stain resistant, and flexible at low temperatures. It has the advantage of maintaining excellent waterproof properties over a long period of time without causing cracks or reducing the ability of the waterproof membrane to adhere to the substrate. Next, details of the present invention will be explained using examples. All parts and percentages in the examples are by weight.
It is. In addition, the test methods in the examples are as follows. 1 Preparation of test specimen A slate board (30 x 30 x 0.3 cm) was sprayed with a coating film waterproofing agent at 2.0 kg/m ² using an air spray gun and left in a room for 24 hours. Next, apply the protective agent using the same air spray gun.
It was sprayed with 2.0 kg/m ² and left for 7 days at 20°C and 60% RH to serve as a characteristic evaluation test piece. 2 Adhesive strength The strength of the adjusted test specimen (normal strength) and the strength of the specimen immersed in water at room temperature for one week and then left at room temperature for one day (water resistant strength) were determined by the Kenken style adhesive strength test. Measured using a machine. The appearance of the test specimen after immersion and the position where the coating film was broken were visually observed. The case where the waterproof membrane was broken was shown as M, and the case where it was broken at the interface between the waterproof film and the protective layer was shown as M.P. 3 Substrate crack followability (zero span tension) A crack is created in the center of the slate board on the base of the test specimen,
Crack followability was measured by pulling at a speed of 5 mm/min. The width of the crack was measured when pinholes or breaks began to occur in the waterproof layer. 4. Contamination resistance In accordance with JISZ2381 (General rules for outdoor exposure test methods), the test specimen was maintained at an angle of 30° to the south on the roof of Toagosei Chemical Industry Co., Ltd. Research Institute (1-1 Funami-cho, Minato-ku, Nagoya). An outdoor exposure test was conducted. 6
After exposure for several months, the appearance was visually judged as follows: 〇 Good △ Slightly soiled × Significantly soiled 5 Load loading test Under a temperature of 20℃ and 60% RH environment, bottom 4 x 4
A steel jig with a diameter of 2 cm and a thickness of 2 cm was placed on top of the specimen and a load of 320 kg was applied from above for 10 minutes. The load was removed, and after 24 hours had passed, the condition of the loaded portion was visually observed, and the degree of deformation was determined as follows. 〇 Almost no deformation △ Slight difference in the load side × Significant deformation or cracking Example 1 Production of paint film waterproofing agent 90 parts of butyl acrylate, 10 parts of vinyl acetate, 2 parts of sodium todecylbenzenesulfonate, 2 parts of polyoxyethylene nonylphenol, ammonium persulfate
A composition consisting of 0.3 parts and 100 parts of water was polymerized in a conventional manner at a temperature of 70°C for 5 hours to produce an acrylic resin-containing emulsion with a solids concentration of 48%, and the pH was adjusted to 7.0 by adding aqueous ammonia. did. The Tg point of the obtained acrylic resin was -48°C. Add a nonionic surfactant emulsion manufactured by Kao Atlas Co., Ltd. per 100 parts of resin to the above emulsion.
910.1 part was added, and 30 parts of kaolin clay and 10 parts of calcium carbonate were mixed to obtain a coating film waterproofing agent. Manufacture of protective agent 50 parts of 2-ethylhexyl acrylate, styrene
50 parts of polyoxyethylene nonylphenol ether, 1 part of stearyltrimethylammonium chloride, 0.4 parts of 2,2-azobis(2-amidinopropane) hydrochloride, and 100 parts of water, and emulsified at a temperature of 70°C. Perform polymerization and determine the solid content concentration
An emulsion containing 48% acrylic resin was produced. The Tg point of the obtained acrylic resin was 2°C. A protective agent was obtained by mixing 50 parts of kaolin clay and 5 parts of titanium oxide. Test specimens were prepared using the above coating film waterproofing agent and protective agent, and various properties were measured. The test results are summarized in Table 3, and all showed good performance. Examples 2 to 4 The coating film waterproofing agent shown in Table 1 and the protective agent shown in Table 2 were
A test specimen was prepared in the same manner as in Example 1 except as described in the table. Table 3 shows the results of various characteristic evaluation tests of this product.
Both of them showed good performance. Comparative Examples 1 to 8 As comparative examples, test specimens were prepared in the same manner as in Example 1 using the coating film waterproofing agents obtained in Examples and the protective agents obtained in Examples or commercially available products. The results of various characteristic evaluation tests are also shown in Table 3, and all of the results were significantly inferior to those obtained by the construction method of the present invention.

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Claims (1)

[Claims] 1 The glass transition temperature of the surface of the object to be waterproofed is -
An emulsion containing an acrylic resin having a temperature of 20°C or less is applied to form a coating film, and then a cationic emulsion containing an acrylic resin having a glass transition temperature of -10°C to 20°C is applied on top of the coating film. A waterproofing construction method characterized by forming a coating film.