JP2007291175A - Modified asphalt composition, and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a lightweight modified asphalt composition curable and accomplishing film formation in a short time even if thick-coated, and keeping its softness even at low temperatures. <P>SOLUTION: The modified asphalt composition is obtained by compounding (A) a modified asphalt emulsion consisting mainly of a total of 100 mass% of (a1) 5-90 mass%, on a solid basis, of a polymer latex and (a2) 95-10 mass% of asphalt with (B) 0.1-2 vol.time(s), on a volume basis and based on 100 vol., on a solid basis, of the component A, of a lightweight filler and (C) 0.1-40 pts.mass, based on 100 pts.mass, on a solid basis, of the component A, of a polyisocyanate compound. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a modified asphalt composition and a method for producing the same, and more specifically, a light weight filler and a polyisocyanate compound are blended in an asphalt emulsion obtained by adding molten asphalt to a polymer latex, thereby reducing the weight of various structures. The present invention relates to a modified asphalt composition useful for a wide range of applications including waterproofing materials, water-stopping materials, and the like, and a method for producing the same.

  As waterproofing / waterproofing materials used for civil buildings such as rooftops of concrete buildings, industrial waste disposal sites, underground structures, etc., mainly (1) asphalt emulsions mainly composed of asphalt and polymer latex, ( 2) Polymer cement mortar mainly composed of cement, (3) Polyvinyl chloride resin sheet, vulcanized rubber sheet of ethylene propylene rubber or styrene butadiene rubber, (4) Coating material using urethane polymer, etc. in use. For these waterproof / waterproof materials, demands for shortening the construction period, reducing maintenance, improving waterproof / waterproof performance, etc. reflecting the recent increase in productivity, labor saving, environmental conservation, etc. Is becoming increasingly severe. However, among the conventional waterproof / waterstop materials, (1) asphalt emulsions mainly composed of asphalt and polymer latex are particularly poor in workability due to their slow drying and curing rate, and also have low adhesion to the substrate. . In addition, (2) polymer cement mortar has a slow drying and curing rate and is brittle in terms of material. Therefore, it cannot be said that the waterproof / waterproof performance is sufficient. In addition, (3) the sheet-like waterproof material of the polyvinyl chloride resin sheet or the vulcanized rubber sheet has poor adhesion to the ground with a step, so that not only the waterproof / waterproof performance becomes insufficient, but the sheet The disadvantage is that the safety and workability when heated and adhered to the substrate are also poor. Furthermore, (4) a coating material using a urethane-based polymer has poor dimensional stability of the coating film, and as a result, is unsatisfactory in terms of waterproof / waterproof performance. Moreover, these waterproof / waterproof materials are usually laminated to improve waterproof / waterproof performance, but the current waterproof / waterproof materials have a slow drying and curing rate, so they are used in the laminating work process. It takes time and productivity and labor saving are worsened. In addition, major problems such as damage to the waterproof layer due to other types of work such as contact with the waterproof layer during assembling of the bar arrangement as well as underground structures, and damage to the waterproof layer due to dropping of tools etc. will also cause serious problems is doing. In order to improve productivity and labor saving, a curable composition in which a water-soluble polyisocyanate is blended with a bituminous emulsion containing cement obtained by adding cement to a bituminous emulsion such as asphalt has also been proposed (Patent Document 1: Japanese Patent Publication). No. 59-38990), since the composition uses a hardening reaction of cement, it takes, for example, 24 hours or more to sufficiently harden, and the above-mentioned problems relating to workability are still being solved. Absent. In addition, there is a strong demand for the development of a waterproof / waterproof material that is less susceptible to damage to the waterproof layer during work and can satisfy both waterproof and waterproof performance.

Patent Document 2 (JP-A-8-157553) discloses a modified asphalt composition that is excellent in dry curability and, as a result, has a short lamination coating time, excellent workability, and waterproof / waterproof performance. Things have been proposed. However, since the specific gravity of this asphalt composition is large, if it is difficult to attach a thickness to a portion where it is difficult to add a thickness, for example, the lower part of an overhang, the periphery of the portion is naturally more than specified. In the end, a thickness exceeding a specified value cannot withstand its own weight, sags occur, and there is a tendency that the portion is depleted of material and the film thickness is further reduced.
Japanese Patent Publication No.59-38990 JP-A-8-157553

  The present invention provides a modified asphalt composition that reduces the specific gravity of the asphalt composition, cures and forms a film in a short time even when it is thickened, retains flexibility even at low temperatures, and imparts impact resistance. The purpose is to provide.

In the present invention, (A) (a1) polymer latex is 5 to 90% by mass in terms of solid content, and (a2) asphalt is 95 to 10% by mass [where (a1) + (a2) = 100% by mass]. For the modified asphalt emulsion as the main component,
(B) 0.1 to 2 times the volume of (A) component (in terms of solid content), and (C) polyisocyanate compound (A) in terms of (A) component (in terms of solid content) 0.1 to 40 parts by mass with respect to
The present invention relates to a modified asphalt composition.
Here, the component (A) is preferably a mixture of (a1) polymer latex and molten (a2) asphalt, and (a1) the polymer latex has a gel content of 60% or less.
The viscosity of the component (A) is preferably 100 to 50,000 mPa · s.
In the composition of this invention, you may mix | blend a thickener further in (A) component so that the viscosity of the said (A) component may be 100-50,000 mPa * s.
Further, the (B) lightweight filler preferably has a bulk specific gravity of 0.005 to 0.5.
Next, this invention relates to the manufacturing method of the said modified asphalt composition which mix | blends the said (A) component, (B) component, and (C) component just before use.
Moreover, this invention relates to the manufacturing method of the said modified asphalt composition formed by mixing (A) component and (B) component previously, and preparing this and (C) component just before use.

In the modified asphalt composition of the present invention, the specific gravity can be reduced by blending a lightweight filler with the modified asphalt, and the thickness can be increased correspondingly, and the impact resistance can be improved. In addition, as an additional effect, it is possible to provide a waterproof / waterproof material with improved sound deadening and heat insulation.
Furthermore, by using an isocyanate system as the curing agent, it is possible to provide a composition that cures and forms a film in a short time even when it is thickened and retains flexibility even at low temperatures.

(A) Modified asphalt emulsion Examples of the (a1) polymer latex used in the component (A) of the present invention include polybutadiene latex, styrene-butadiene copolymer latex, styrene-methyl methacrylate-butadiene copolymer latex, Methyl methacrylate-butadiene copolymer latex, acrylonitrile-butadiene copolymer latex, chloroprene rubber latex, vinyl chloride latex, vinylidene chloride latex, ethylene-vinyl acetate copolymer latex, acrylate-vinyl acetate copolymer latex, Acrylate-styrene copolymer latex, acrylate-ethylene copolymer latex, silicone-acrylate copolymer latex, olefin latex, polyurethane It can be mentioned rubber latex or resin latex, such as box. These polymer latexes can also have at least one functional group such as a carboxyl group, an amide group, an N-methylol group, a glycidyl group, a hydroxyl group, and a sulfonic acid group.
In the present invention, particularly preferred polymer latexes are styrene-butadiene copolymer latex and carboxyl-modified styrene-butadiene copolymer latex.

Here, the gel content of the (a1) polymer latex is usually 60% or less, preferably 0 to 50%, more preferably 0 to 40%.
Here, the gel content is measured by measuring the insoluble toluene content. (1) A polymer latex film is prepared, 0.3 g is collected in an Erlenmeyer flask, and (2) 100 ml of toluene is added and stirred for 1 hour. (3) Leave for 15 hours ± 1 hour, (4) Stir again for 1 hour, filter the whole volume with filter paper, (5) Dispense into a pre-weighed aluminum pan, dry the toluene, (6) The value obtained by calculating the insoluble content of toluene. When the gel content exceeds 60%, a high-concentration asphalt emulsion cannot be produced when an (a1) polymer latex and (a2) asphalt are emulsified to produce an asphalt emulsion.
The gel content of (a1) polymer latex can be adjusted to 60% or less by adjusting the molecular weight or the functional group.
Moreover, the polymer latex which made the average gel part 60% or less can be used by mixing 2 or more types of polymer latexes with a high gel part, and a low gel part polymer latex.

The glass transition temperature (Tg) of the polymer constituting the polymer latex is preferably −80 to + 10 ° C., more preferably −70 to 0 ° C., and particularly preferably −65 to −10 ° C. . In this case, if the Tg is less than −80 ° C., the coating strength of the resulting modified asphalt composition is reduced, and the stain resistance is insufficient. On the other hand, if it exceeds + 10 ° C., the coating becomes hard and cold resistant. Decreases. Here, the Tg of the polymer latex in the present invention is determined by the following condition (i) using a differential scanning calorimeter (DSC) manufactured by Rigaku Corporation.
And measured in (ii).
(i) About 5 g of polymer latex is thinly drawn on a glass plate and dried at 25 ° C. for 7 days to obtain a polymer film.
(ii) The Tg of the obtained dry polymer film is measured under the conditions of a heating rate: 20 ° C./min, an atmosphere: nitrogen gas, and a sample amount of 20 mg.

The solid content of the polymer latex is usually 45 to 75% by mass.
In this invention, polymer latex can be used individually or in mixture of 2 or more types.

  The amount of the polymer latex used in the present invention is 5 to 90% by mass, preferably 30 to 90% by mass, more preferably 50 to 85% by mass with respect to the asphalt emulsion (solid content) as a solid content. . In this case, when the amount of the polymer latex used is less than 5% by mass, the temperature dependence of the coating film of the finally obtained modified asphalt composition is increased, the coating film is likely to be blistered, and the coating to the base Adhesiveness also decreases, and if it exceeds 90% by mass, waterproof / waterproof performance corresponding to the cost cannot be obtained.

In addition, surfactant may be mix | blended with the said polymer latex. Surfactants to be incorporated include anions such as rosinate, fatty acid salt, higher alcohol sulfate, alkylbenzene sulfonate, diphenyl ether disulfonate, dialkyl disulfosuccinate, alkyl phosphate salt, polyoxyethylene sulfate salt, etc. Cationic surfactants such as alkylamine salts, quaternary ammonium salts and polyoxyalkylamines; polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, Polyoxyethylene amine ester, polyoxyethylene-polyoxypropylene block polymer, alkyl alkanolamide, alkyl polyglucoside, alkyl glycerin ester And the like nonionic surface active agents such as ether. Moreover, the said surfactant can also be a fluorine-type surfactant in which a lipophilic group has a fluorine atom. Of these surfactants, rosin acid salts, fatty acid salts and polyoxyethylene sulfate salts are preferred. The said surfactant can be used individually or in mixture of 2 or more types.
The amount of the surfactant used is preferably 0.01 to 5.0% by mass, more preferably 0.05 to 4.5% by mass, particularly preferably based on the modified asphalt emulsion (solid content). It is 0.1-3.0 mass%. In this case, when the amount of the surfactant used is less than 0.01% by mass, the viscosity stability over time of the asphalt emulsion is lowered. On the other hand, when the amount exceeds 5.0% by mass, the resulting modified asphalt composition The water absorption resistance is lowered, and it becomes difficult to maintain the initial waterproof / waterproof performance.

  Next, the (a2) asphalt used for the component (A) of the present invention is not particularly limited, and may be natural asphalt or petroleum asphalt. Examples of such asphalt include slate asphalt, blown asphalt, and semi-blown asphalt mainly composed of asphaltene, paraffin, naphthene, and aromatic resin.

The penetration of (a2) asphalt used in the present invention is usually 20 to 200, preferably 40 to 150, and more preferably 60 to 120. If the penetration is less than 20, the kinematic viscosity is high and a stable emulsion cannot be prepared. On the other hand, if it exceeds 200, the coating film properties after the product are large and the strength as a coating film is high. It is difficult to express.
Here, the penetration is a value measured according to JIS K2207.

  The amount of (a2) asphalt used in the present invention is 95 to 10% by mass, preferably 90 to 30% by mass, more preferably 85 to 50% by mass in the modified asphalt emulsion (A) [provided that (a1) + (A2) = 100 mass%]. In this case, when the amount of asphalt used is less than 10% by mass, the waterproof / waterproof performance is deteriorated. On the other hand, when it exceeds 95% by mass, the temperature dependency of the resulting modified asphalt composition becomes large, and asphalt modification As a result, the coating film is likely to change with time, and the elongation at low temperature is reduced, resulting in a brittle coating film.

  The (A) modified asphalt emulsion in the present invention is prepared by adding asphalt heated and melted at, for example, 90 to 150 ° C. to the polymer latex, mixing and then cooling. In this way, by adding and mixing heated and melted asphalt into the polymer latex, the waterproof and water-stop performance is particularly improved compared to when adding and mixing the polymer latex into the pre-prepared asphalt emulsion. Is done.

The particles in the modified asphalt emulsion (A) thus obtained have an average particle size of 1 to 30 μm, preferably 3 to 30 μm, more preferably 5 to 20 μm. If it is less than 1 μm, an asphalt emulsion having a high solid content (70% by mass or more) cannot be produced, while if it exceeds 30 μm, storage stability is impaired.
In addition, it is preferable that the particle | grains in (A) modified asphalt emulsion occupy 70% or more in 1-50 micrometers by particle size distribution.
Here, the particle diameter is a value obtained by measuring the particle diameter at a volume average of 50% using Microtrac MT3300EXII (manufactured by Nikkiso Co., Ltd.).
In addition, the particle diameter of (A) modified asphalt emulsion can be easily adjusted with the addition amount of a surfactant, and emulsification / dispersion time.

The viscosity of the (A) modified asphalt emulsion thus prepared is usually 100 to 50,000 mPa · s, preferably 200 to 30,000 mPa · s, more preferably 300 to 20,000 mPa · s. . If it is less than 100 mPa · s, the light filler is likely to be localized, while if it exceeds 50,000 mPa · s, the workability of construction is lowered.
The viscosity is a value measured using a B-type rotational viscometer manufactured by Tokimec.
This viscosity can be adjusted by adding a thickener such as polycarboxylic acid, polyacrylic acid, polyether, or water-soluble polymer.

  In addition, the total solid content of (A) asphalt emulsion in this invention is 65-90 mass% normally, Preferably it is 70-88 mass%, More preferably, it is 75-85 mass%. In this case, if the total solid content is less than 65% by mass, the emulsion has a large amount of water generated in the curing process, and it takes a long time to complete the film formation. The total solid content of the resulting modified asphalt composition is also low, As a result, the dry curability is lowered, and the workability for making the laminated coating film is deteriorated. On the other hand, when it exceeds 90% by mass, the asphalt emulsion tends to change in viscosity with time, and the viscosity of the asphalt emulsion becomes high, so that the coating suitability of the resulting modified asphalt composition is also lowered.

The elongation percentage of the coating film of the modified asphalt emulsion (A) is 300% or more, preferably 500% or more, more preferably 600% or more in the normal state (in an atmosphere of 23 ° C. and humidity 50% RH). It is. If it is less than 300%, the flexibility when a lightweight filler is contained decreases.
Here, the measurement of the elongation percentage of the coating film is a value measured in accordance with JIS A6021 architectural waterproofing film.
In order to make the elongation percentage of the coating film 300% or more in a normal state, it can be easily adjusted by the ratio of the component of the polymer latex or the components (a1) and (a2) of the modified asphalt emulsion.

(B) Lightweight filler (B) The lightweight filler used in the present invention reduces the weight of the composition in the modified asphalt composition of the present invention, and the lightweight filler absorbs an impact received from the outside. It achieves the effect of sound insulation and heat insulation by intervening.
(B) Lightweight fillers include glass balloons, silica balloons, shirasu balloons, carbon balloons, phenol balloons, alumina balloons, polystyrene balloons, polyethylene balloons, ceramic beads, vermiculite, perlite, thermally expandable microcapsules, porous calcium silicate However, elastic materials such as polystyrene balloons and polyethylene balloons are preferred.
(B) The lightweight filler is more preferably in a non-water-absorbing state. Such (B) lightweight filler does not absorb water and can maintain waterproof performance. Moreover, an asphalt emulsion and a lightweight filler can exist independently, and the heat insulation effect can be provided. Furthermore, the adhesion between the modified asphalt emulsion and the lightweight filler can be improved by imparting a functional group to the surface.
(B) As a commercial item of a lightweight filler, Sekisui Chemicals Co., Ltd. eslen beads etc. are mentioned.

  (B) The bulk specific gravity of the lightweight filler is 0.005 to 0.5 (corresponding to 2 to 200 times in terms of foaming rate), preferably 0.006 to 0.1 (corresponding to 10 to 150 times in terms of foaming rate), More preferably, it is 0.05 to 0.01 (corresponding to 20 to 100 times in terms of foaming rate). If it is less than 0.005, the lightweight filler is localized and does not exist uniformly in the composition, and if it exceeds 0.5, the resulting composition is difficult to have a thickness when applied to a vertical surface.

The average particle size of the (B) lightweight filler is usually 0.3 to 3.0 mm, preferably 0.5 to 2.5 mm, more preferably 0.8 to 2.0 mm, and less than 0.3 mm. Then, even if it constructs using the composition obtained, thickness securing is difficult and impact resistance falls. On the other hand, when it exceeds 3.0 mm, even if it constructs using the composition obtained, a modified asphalt layer will become thin partially and it will be difficult to form a continuous coating film.
Moreover, the aspect ratio (major axis / minor axis ratio) of the (B) lightweight filler is 1 to 2, preferably 1 to 1.8, and more preferably about 1 to 1.5. When it exceeds 2, it is difficult to form a continuous layer, and it is difficult to form a continuous coating film.
Here, the average particle diameter is arbitrarily taken out the light filler particles five times, take a magnified photograph at 50 times, find the length of the short side and the long side, respectively, calculate the ratio of the short side and the long side, It is a value obtained by obtaining an average value of five pieces.

  (B) The usage-amount of a lightweight filler is 0.1-2 volume times with respect to 100 volume part of (A) component (solid content conversion), Preferably it is 0.5-1.5 volume times, More preferably, it is 0.00. 8 to 1.2 times the volume. If it is less than 0.1 volume times, even if it constructs using the composition obtained, thickness ensuring is difficult and impact resistance falls. On the other hand, when it exceeds 2 volume times, the flexibility of the composition obtained cannot be secured and it is difficult to form a continuous layer.

(C) Polyisocyanate compound Next, the (C) polyisocyanate compound used in the present invention is flexible with a thickness of 5 mm or more by applying the resulting composition in the asphalt composition of the present invention. The solidified product can be produced and plays the role of forming the solidified product in a short time. This (C) polyisocyanate compound is a polyisocyanate compound having an isocyanate group.
Examples of the (C) polyisocyanate compound include phenylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, 4,4′-biphenyl diisocyanate, 3,3′-dimethyl-4,4′-biphenyl diisocyanate. 4,4'-diphenylmethane diisocyanate, 3,3'-dimethyl-4,4'-diphenylmethane diisocyanate, triphenylmethane diisocyanate, naphthalene diisocyanate, isophorone diisocyanate, cyclohexylene diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylylene diisocyanate Diisocyanate compounds such as dicyclohexylmethane diisocyanate and hexamethylene diisocyanate; Methane triisocyanate, triphenylmethane triisocyanate, triisocyanate compounds such as naphthalene triisocyanate; and the like of these polymers.

The compounding quantity of the polyisocyanate compound in this invention is 0.1-40 mass parts with respect to 100 mass parts (solid content) of a modified asphalt emulsion, Preferably it is 0.3-30 mass parts, More preferably, it is 0.00. 5 to 25 parts by mass. In this case, if the blending amount of the polyisocyanate compound is less than 0.1 parts by mass, the resulting modified asphalt composition has low dry curability, and it takes time to apply the layer coating, and the workability of the work is reduced. On the other hand, when it is thickened, the film is not formed. On the other hand, when the amount exceeds 40 parts by mass, carbon dioxide gas is generated in the coating film due to the reaction of water and isocyanate, and a dense coating film is not formed. As a result, the viscosity of the resulting modified asphalt composition is likely to change over time, resulting in a decrease in coating suitability.
In the present invention, the (C) polyisocyanate compound can be blended at an appropriate stage from the preparation of the asphalt emulsion to just before use of the final composition, but just before the final composition is used as a waterproofing material, for example. It is desirable to do.

  In the present invention, the waterproof material composition [excluding the above component (B)] comprising the component (A) and the component (C) is a material having flexibility even if it contains the component (B). The elongation measured by the waterproof material alone according to JIS A6021 is 300% or more, preferably 500% or more. If the elongation is less than 300%, the asphalt composition obtained according to the present invention may crack due to impact load. This elongation can be easily adjusted by the type and amount of the polymer latex in the component (A).

Thickener In addition, the modified asphalt composition of the present invention can be added with (A) a thickener during preparation of the asphalt emulsion. By adding this thickener to the component (A), the thickening agent has effects such as prevention of localization of the lightweight filler and improvement of thick coating property on the vertical surface. Examples of the thickener include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, casein, block copolymer latex emulsified with polyacrylic acid or derivatives thereof (Japanese Patent Publication No. 52-22651), and water-soluble. Examples thereof include polycarboxylic acids (salts), cation-based polymers such as dimethylaminoethyl methacrylate methyl chloride quaternary salt polymer and diallyldimethylammonium chloride quaternary salt polymer.
These may be used alone or in combination of two or more.
The amount of the thickener used can be suitably used within the range where the viscosity of the component (A) is 100 to 50,000 mPa · s.

  Furthermore, the modified asphalt composition of the present invention includes, if necessary, tackifiers such as cement, petroleum resin, rosin resin; other bitumen substances such as heavy oil, pitch, tar, calcium carbonate, aluminum hydroxide, Fillers other than component (B) such as magnesium hydroxide, talc, clay, mica and rubber powder; reinforcing materials such as carbon fiber, glass fiber and organic fiber; aggregates such as dredged sand, crushed stone and gravel; titanium oxide, carbon Pigment such as black; Anti-aging agent such as styrenated phenol, diphenylamine, 2,6-ditertiarybutyl-4-methylphenol; Ultraviolet absorber such as hindered amine, benzophenone, benzotriazole; Dioctyl phthalate, dibutyl phthalate, (dibutyl adipate , Dioctyl adipate, dibutyl sebacate, geo Chilsebacypate) Plasticizers such as polyethylene glycol, butyl cellosolve, carbitol acetate and triethylene glycol monobutyl ether; Diluents such as toluene, xylene and ethyl acetate; Antifoaming agents such as dimethylpolysiloxane emulsions; Methyltrimethoxysilane, Vinyltri Alkoxysilane compounds such as methoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane; cross-linking agents such as zinc oxide, calcium acetate, zirconium acetate, aziridine, melamine resin; benzoisothiazoline, methyliso Anti-septics such as azoline and hydrogen peroxide; flame retardants such as antimony trioxide; antifoaming agents such as sodium hydroxide, zeolite and diatomaceous earth, protective colloids, etc. It can also be of.

Preparation of Composition As described above, in the modified asphalt composition of the present invention, (C) the polyisocyanate compound can be blended at an appropriate stage from the preparation of the asphalt emulsion to just before use of the final composition. However, when the final composition is used as a waterproofing material, for example, it is desirable to blend it immediately before.
Therefore, to prepare the modified asphalt composition of the present invention,
(1) The above component (A) (which may contain a thickener), (B) component and (C) component are prepared immediately before use,
(2) It is preferable that the component (A) (which may contain a thickener) and the component (B) are mixed in advance and the component (C) is prepared immediately before use.

The construction method in the case of using the modified asphalt composition of the present invention, for example, as a waterproofing material for rooftops of underground structures and outer wall waterproofing materials for underground structures, first, preferably a primer such as an asphalt primer, After applying and drying about 0.1 to 0.2 kg / m ² , the modified asphalt composition of the present invention is laminated and applied once or twice so that the film thickness is usually about 5 to 20 mm. To do. In this application, an appropriate application means such as a brush, a roller brush, a trowel, or a sponge brush, or a spraying means can be used. In addition, in drying after application | coating, it is not necessary to heat in particular.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. In the examples, parts and% are based on mass unless otherwise specified.

In the following examples, the components used are as follows.
(A) Component JSR 0561: manufactured by JSR, styrene-butadiene rubber latex, solid content 69% by mass, gel content = less than 3% JSR 0548: manufactured by JSR, carboxylic acid-modified styrene-butadiene rubber latex rubber latex, gel content = 85%
JSR 0858: manufactured by JSR, styrene-butadiene rubber latex rubber latex, gel content = 28%
JSR 2108: made by JSR, styrene-butadiene rubber latex rubber latex, gel content = less than 3% Asphalt: straight asphalt made by Cosmo Asphalt with a penetration of 80-100

(B) Component φ1.5 mm PS beads: manufactured by Sekisui Plastics Co., Ltd., Eslen HNB 30 times expanded product, bulk specific gravity = 0.03
φ3 mm PS beads: Sekisui Plastics Kogyo Co., Ltd., Eslen HNB 50 times expanded product, bulk specific gravity = 0.05
Ceramic beads: manufactured by Sanchemtech, φ1.5 mm, bulk specific gravity = 0.3
Vermiculite GS: NITTA, bulk specific gravity = 0.14
Perlite L: manufactured by Fuji Talc Industrial Co., Ltd., bulk specific gravity = 0.18

(C) Component polyisocyanate compound: manufactured by Nippon Polyurethane Industry Co., Ltd. (Wood Cure 300)
Other additives Portland cement: Taiheiyo Cement, Normal Portland cement Polycarboxylic acid soda (thickener): Etec, QL180

In addition, the examples and various measurement items are measured as follows.
(A) Component viscosity (mPa · s):
The measurement was performed using a B-type rotational viscometer manufactured by Tokimec.
Coating thickness (mm):
The thickness when a 15 mm thick formwork was made on the release paper and the modified asphalt composition was poured into the formwork.

Method for measuring gel content in polymer latex:
The method for measuring the bulk specific gravity of lightweight filler:
Using a specific gravity cup manufactured by Yoshimitsu, the specific gravity was converted to water.

Impact resistance (impact resistance test):
1． Preparation of test specimen (1) On the release paper, form a mold to a specified thickness, and pour a waterproof material uniformly into a size of 200 x 300 (mm).
(2) Cured for 7 days in an atmosphere of 23 ° C x 50% RH.
2． Test method (1) Install the test specimen as shown in Fig. 1 and cure it in a 20 ℃ atmosphere for 1 hour or longer.
(2) First, drop the weight from a height of 0.5m, and if there is no hole in the waterproof layer, change the height to 1m and 1.5m and check the hole in the waterproof layer.

○: Pass (satisfying impact resistance 3, 4)
Δ: lower limit of pass (impact resistance 2 satisfied)
X: Fail (impact resistance is 1)

Bendability (flexibility):
1-1. Preparation of test specimen (1) Pour evenly into a 500 x 500 x 15 (mm) formwork.
(2) Cured for 7 days (or more) in an atmosphere of 23 ° C x 50% RH.
(3) This is a test specimen.
1-2. Preparation of test pieces (1) Prepare six test specimens that are 30mm wide x 150mm long.
1-3. Test method
1-3-1. Bending test in standard condition (1) Bend with a φ30mm rod as shown in Fig. 2 in an atmosphere of 23 ° C x 60% RH, and check the state of the coating film (the state of cracking).
○: Pass (no cracking occurs even when bent more than 5 times)
Δ: Acceptance lower limit (crack occurs in 2-4 times)
X: Fail (crack occurs by one bend)

Curability:
Component (C) was mixed to confirm the state of cured film formation (the emulsion was not attached by finger touch).
○: Pass (hardens within 8 hours)
Δ: Acceptable lower limit (not cured within 8 hours, cured within 24 hours)
X: Fail (There is a liquid part even if it exceeds 24 hours.)

Pressurized water permeability test:
1． Preparation of test specimen (1) Pour evenly into a 500 x 500 x 15 (mm) formwork.
(2) Cured for 7 days (or more) in an atmosphere of 23 ° C x 50% RH.
(3) This is a test specimen.
2． Preparation of test piece (1) A test piece is cut to φ300 mm.
(2) Make a hole in the bolt hole of the testing machine with a punch.
3． Test method (1) A test body is attached to a pressurized water permeability tester as shown in FIG.
(2) Tighten the bolt and apply a water pressure of 0.3 MPa for 1 hour to check for water leakage from the hole at the bottom of the tester.
(Note) Always tighten the bolts to prevent leakage from the packing part of the testing machine.
○: Pass (no water leakage)
X: Fail (leaks water)

Sagging (yield): A 200 × 300 (mm) slate plate was set up vertically, the modified asphalt composition was applied, and the thickness at which sagging occurred was measured.
A yield of 5 mm or more in thickness is accepted.
Specific gravity measurement method: The specific gravity was converted to water and calculated using a specific gravity cup manufactured by Yoshimitsu.

Elongation rate of coating film: Based on JIS A6021, a coating film containing only component (A) was prepared and measured.
An elongation of 300% or more is acceptable.

Workability: A 10mm width x 15mm height spacer is attached to both ends of a 200mm x 300mm slate plate to create a formwork, and a thickener and polyisocyanate compound are mixed in a lightweight filler-containing modified asphalt emulsion. The state until it was poured into the mold, pressed with a trowel, and in line with this formwork was judged.
In addition, after 24 hours, the mold was removed from the mold, and it was confirmed that the material had spread to every corner.
○: Passed (can be brought into the formwork within 10 times of pressing the iron)
△: Lower limit of acceptance (can be brought into a state where the iron has been pressed down more than 10 times and within 20 times in the mold)
X: Failed (cannot be in the form even if the iron has been pressed more than 20 times. Or, after demolding, the material has not passed.)

Example 1 [Examples and comparative examples in which the type of component (A) was changed]
An asphalt emulsion was prepared by blending materials having the composition shown in Table 3 into a stainless steel container having an internal volume of 1 liter. That is, (A) Asphalt emulsion is first made of 15 parts by mass of polymer latex in terms of solid content and 0.9 parts by mass of potassium rosinate surfactant with respect to polymer latex + asphalt = 100 parts by mass. After mixing in a container and stirring at 300 rpm with a laboratory stirrer, the mixture was heated to 50 ° C., and 85 parts by mass of straight asphalt heated and melted at 130 ° C. was gradually added to this liquid under stirring. Thereafter, in order to obtain a predetermined solid content (80% by mass), water and 2 parts by mass of sodium polycarboxylate as a thickener were added and cooled to prepare. (A) Asphalt emulsion prepared in this way, immediately before use, (B) φ1.5 mm PS beads as a lightweight filler, 1/1 in volume ratio of (A) component / (B) component, and (C) 10 parts by mass of a polyisocyanate compound was added as shown in Table 3 for evaluation. The results are shown in Table 3. In Table 3, the viscosity of the component (A) is the viscosity of the component (A) alone when no thickener is added.

Examples 2-7, Comparative Examples 1-2
Asphalt compositions were prepared and evaluated in the same manner as in Example 1 with the formulation shown in Table 3. The results are shown in Table 3.
Comparative Example 1 did not contain polymer latex and was made only from molten asphalt.
The comparative example 2 did not contain a molten asphalt, and produced only with polymer latex.

Examples 8 to 14 and Comparative Examples 3 to 4 [Examples and Comparative Examples in which Component (B) was Changed]
An asphalt composition was prepared and evaluated in the same manner as in Example 1 except that the formulation of Table 4 was used. The results are shown in Table 4. In addition, Example 2 in Table 4 and Example 2 in Table 5 are the same as Example 2 in Table 3.

Examples 15-19, Comparative Examples 5-7
An asphalt composition was prepared and evaluated in the same manner as in Example 1 except that the thickening agent was added or not, and the formulation shown in Table 5 was used. The results are shown in Table 5.
The thickener (polycarboxylic acid soda, QL180 manufactured by Etec Co., Ltd.) was added to the target viscosity while stirring with a lab stirrer when the component (A) was prepared.
The modified asphalt emulsion (A) used in Examples 15 to 19 and Comparative Examples 5 to 7 had the same composition, and the particle diameter of the emulsion was as shown in Table 2.

  The modified asphalt composition of the present invention is a waterproofing material used for roofs and walls of ground structures such as concrete buildings, wall surfaces of underground structures such as subways and tunnels, slopes and bottoms of industrial waste treatment plants, or the like. Water-stopping materials; cement concrete, cement secondary products, ceramics, aggregates, wood, paper, metal, plastic, rubber, glass, fibers, etc., binders, adhesives, protective coating materials or grout materials; sealing materials It is useful as a binder for road paving.

It is the schematic of an impact resistance test. It is the schematic of a bending test. It is the schematic of a pressurized water permeability test.

Claims (7)

(A) (a1) The polymer latex is 5 to 90% by mass in terms of solid content, and (a2) 95 to 10% by mass of asphalt [provided that (a1) + (a2) = 100% by mass] is the main component. For modified asphalt emulsion,
(B) 0.1 to 2 times the volume of (A) component (in terms of solid content), and (C) polyisocyanate compound (A) in terms of (A) component (in terms of solid content) 0.1 to 40 parts by mass with respect to
A modified asphalt composition obtained by blending.   The modified asphalt composition according to claim 1, wherein the component (A) is a mixture of (a1) polymer latex and molten (a2) asphalt, and (a1) the polymer latex has a gel content of 60% or less. object.   The modified asphalt composition according to claim 1 or 2, wherein the component (A) has a viscosity of 100 to 50,000 mPa · s.   The modified asphalt composition according to any one of claims 1 to 3, wherein a thickener is further blended in the component (A) so that the viscosity of the component (A) is 100 to 50,000 mPa · s.   (B) The lightweight filler has a bulk specific gravity of 0.005 to 0.5. The modified asphalt composition according to any one of claims 1 to 4.   The manufacturing method of the modified asphalt composition in any one of Claims 1-5 which prepares (A) component, (B) component, and (C) component just before use. The manufacturing method of the modified asphalt composition in any one of Claims 1-5 which mixes (A) component and (B) component previously, and prepares this and (C) component just before use.