JP2000136323A - Flame-retardant coating film waterproofing composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition which can give a coating film excellent in waterproofing performance and flame retardancy by adding a specified amount of an inorganic hydraulic substance and a specified amount of an inorganic flame retardant to an aqueous emulsion of a copolymer comprising structural units of an alkyl (meth)acrylate and structural units of (meth)acrylamide and having a specified or lower glass transition point. SOLUTION: An inorganic hydraulic substance in an amount of 10-150 pts.wt., 80-200 pts.wt. inorganic flame retardant selected from among a metal hydroxide, a metal oxide, and a metal salt are added to 100 pts.wt. aqueous emulsion of a copolymer essentially consisting of 20-90 wt.% structural units of an alkyl (meth)acrylate with a 4-10C alkyl, 0.1-8 wt.% structural units of methyl (meth) acrylate and/or ethyl (meth)acrylate, and 0.01-30 wt.% structural units of (meth) acrylamide of the formula and having a glass transition point of -20 deg.C or below. In the formula, R1 is H or methyl; and R2 is H or a 1-4C alkyl.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for waterproofing a flame-retardant coating film having a coating film having both waterproof performance and flame retardancy, and can be widely used in the technical fields of civil engineering and construction. Things.

[0002]

2. Description of the Related Art Conventionally, for waterproofing a structure, a coating film waterproofing composition comprising an emulsion of an alkyl acrylate polymer having excellent weather resistance has been used in many cases. The performance required of these coating film waterproofing compositions is that, in terms of waterproofing of buildings, they have the ability to follow a base crack, and this performance does not decrease even at low temperatures such as winter, and in summer. At high temperatures, it does not cause sagging or decrease in strength, and the coating film is excellent in glossiness without stickiness and excellent in water resistance, chemical resistance, ultraviolet resistance, ozone resistance, etc. No.

[0003] On the other hand, from the viewpoint of disaster prevention, in recent years, it has been required in all fields to make materials inflammable due to overcrowding of living environment. For example, legal regulations on the use of flame-retardant materials include, where theaters, public halls, hospitals, department stores, etc., where a large number of people enter and leave, may use non-combustible, semi-non-combustible and flame-retardant materials. It is stipulated by the Building Standards Law, and even some paints are required to have flame retardancy as Fire Protection Material Certification No. 0003, 0004 and 0005 for building.

There is no particular restriction on the flame retardancy of the coating film waterproofing composition. However, in facilities handling hazardous materials, the Fire and Disaster Management Agency's Dangerous Goods-related notice "Urethane foam as a heat insulator for outdoor storage tanks" It is desired to pass the flame-retardant test in the section "Judgment Criteria for Flame Retardancy", and it is expected that this tendency will become stronger in the future. However, many of the coating films obtained from the conventional coating film waterproofing composition are flammable, and various methods have been studied for imparting flame retardancy thereto.

[0005] The main methods include a method of blending a flame retardant into a waterproofing composition, a method of blending a nonflammable inorganic filler, and a method of making a polymer constituting the waterproofing composition itself flame-retardant. No.

As a method of blending a flame retardant, there are known halogen phosphorus compounds such as perchloropentacyclodecane, tris (chloromonopropyl) phosphate, hexabromobenzene and tris (chlorobromopropyl) phosphate, and dicumyl paroxylate. There is a method of blending a liquid flame retardant such as an oxide and an inorganic flame retardant such as antimony trioxide in a waterproofing composition. However, when a liquid flame retardant is added, it is difficult to impart flame retardancy to the coating film over a long period of time because the flame retardant escapes with time, and the strength and gloss of the coating film decrease. However, when an inorganic flame retardant is blended, the flame retardant does not escape, but the resulting coating film has insufficient elongation and cracks in the base The followability was insufficient.

[0007] As a method of compounding the non-combustible inorganic filler, calcium carbonate, silica sand and the like, which are available at a low cost, have been compounded. However, if these inorganic substances are not mixed in large amounts, they do not have flame retardancy. Mostly, the main purpose is to reduce the amount of smoke, and the flame retardancy itself is weak. Furthermore, since the obtained coating film contains a large amount of the above-mentioned inorganic substances, there is a problem that the elongation of the coating film is reduced, and the coating film cannot be used as a waterproofing composition.

The method of making the polymer itself flame-retardant is to carry out flame-retardation by replacing the flammable polymer with a more flame-retardant polymer. Although there is a method of using a polymer or compounding a halogen-based polymer, the flexibility of the coating film is poor, such as a coating film waterproof material,
It could not be used for applications that require a high degree of elongation, such as low temperature flexibility and the ability to follow cracks in the substrate.

[0009]

DISCLOSURE OF THE INVENTION As a waterproofing composition for solving the above problems, the present inventors have proposed a (meth) acrylic copolymer or a (meth) acrylic copolymer obtained by copolymerizing a vinylidene chloride monomer. However, the present inventors have found a flame-retardant coating waterproofing composition comprising a copolymer having a triazine ring and a vinylidene chloride-based polymer (Japanese Patent No. 2669011). In the event that the coating burns due to the inclusion of vinylidene,
Since harmful substances may be generated, a waterproofing composition that does not use a halogen-based polymer such as vinylidene chloride has been required. In addition, since vinylidene chloride as a component is decomposed with time, the weather resistance of the coating film is reduced with time.

[0010] The inventors of the present invention have excellent safety without using a halogen-based monomer or polymer, and the obtained coating film has flame retardancy, and the coating film is formed quickly. The inventor conducted intensive studies to find a composition for waterproofing a flame-retardant coating film in which the film is excellent in performance required as a waterproof material such as weather resistance, strength, flexibility, water resistance and alkali resistance.

[0011]

Means for Solving the Problems The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, have determined that a specific monomer is a constituent component and that the glass transition point is -20 ° C or lower. The present inventors have found that a composition comprising an inorganic hydraulic substance such as an aqueous emulsion of a copolymer and cement and an inorganic flame retardant have both flame retardancy and ability as a waterproofing material, and have completed the present invention. Hereinafter, the present invention will be described in detail. In this specification, an acrylate or a methacrylate is referred to as a (meth) acrylate, and an acrylamide or a methacrylamide is referred to as a (meth) acrylamide.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A (A) Aqueous Emulsion of Copolymer The copolymer in the aqueous emulsion of the copolymer of the present invention is an alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms. 90% by weight, methyl (meth) acrylate and / or ethyl (meth) acrylate 0.1 to 8
%, And 0.01 to 30% by weight of (meth) acrylamide represented by the following general formula are essential constituent monomer units, and the glass transition point is −20 ° C. or lower.

The alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms is a component for imparting weather resistance, cold resistance and alkali resistance to the coating film. Carbon number 4 ~
Specific examples of the alkyl (meth) acrylate having 10 alkyl groups include butyl (meth) acrylate, isobutyl (meth) acrylate, and (meth) acrylic acid-2-
Examples include ethylhexyl, n-octyl (meth) acrylate, and n-hexyl (meth) acrylate.
An alkyl (meth) acrylate having less than 4 carbon atoms is
Alkali (meth) acrylates having more than 10 carbon atoms cannot be used because of their reduced cold resistance, because the alkali resistance of the coating film deteriorates and cannot be used in large amounts. The copolymerization ratio of the alkyl (meth) acrylate is 20 to 90% by weight, preferably 60 to 90% by weight. When this proportion is less than 20% by weight, the weather resistance of the coating film is reduced, while when it exceeds 90% by weight, the coating film becomes sticky or the strength is reduced.

In the present invention, methyl (meth) acrylate and / or ethyl (meth) acrylate are used as an essential component of the copolymer, and among them, methyl (meth) acrylate is preferred. These monomer units in the copolymer,
It is hydrolyzed by the alkali in the cement, which forms internal crosslinks with Ca in the cement, and has a favorable effect such as increasing the strength of the coating film. These monomer copolymerization ratios,
0.1 to 8% by weight. If the ratio is less than 0.1% by weight, the strength of the coating film is reduced. If the ratio is more than 8% by weight, the water resistance and alkali resistance of the coating film are extremely reduced, and the performance as a waterproof material is reduced. Cannot be maintained.

Examples of (meth) acrylamide represented by the following general formula include N-methylol (meth) acrylamide and N- (butoxymethyl) (meth) acrylamide.

[0016]

Embedded image

(However, R ¹ is hydrogen or a methyl group, R ² is hydrogen or an alkyl group having 1 to 4 carbon atoms.) The details of the action of the monomer are unknown, but inorganic water such as cement or the like is not known. When mixed with a hard substance, it has a function of improving the stability of the aqueous emulsion, the drying property of the obtained coating film, the adhesion to the base, and the like. The copolymerization ratio of the monomer is 0.01 to 30% by weight, preferably 0.1 to 10% by weight. If the amount is less than 0.01% by weight, the above effect cannot be exhibited. If the amount exceeds 30% by weight, the water resistance of the coating film is remarkably reduced.

The copolymer may be a copolymer obtained by copolymerizing a monomer having an unsaturated ethylene bond copolymerizable with the above-mentioned monomer, if necessary. As the monomer,
Usually, any one may be used as long as it is used as a copolymerizable monomer in a (meth) acrylic polymer, and specifically,
Examples include styrene, (meth) acrylonitrile, vinyl acetate, and vinylidene chloride. However, a monomer having a carboxyl group or a sulfonic acid group as a functional group and a usual cationic monomer may reduce the stability of the emulsion, and it is preferable not to use the monomer. The copolymerizable ratio of these copolymerizable monomers is preferably 100 parts by weight or less based on 100 parts by weight of the alkyl (meth) acrylate, and the glass transition point of the copolymer shown below is -20.
It is preferable to select the type and the copolymerization ratio so that the temperature is lower than or equal to ° C.

As the copolymer in the component (A), of the copolymers obtained by polymerizing the above monomers, those having a glass transition point (hereinafter referred to as Tg point) of -20 ° C. or lower are used. Thereby, even when applied as a waterproofing agent at a thickness of several hundred μ or more at a time, cracks and cracks do not occur, and the base cracking ability is excellent, and specifically, several mm is applied to the base by the movement of the building or the like. Even if cracks occur, the film can follow well without generating pinholes, etc.
It is also excellent in coating properties and film forming properties at low temperatures. Here, when a polymer having a Tg point exceeding −20 ° C. is used, if the film thickness is set to several hundreds μ or more, which is usually applied with a waterproofing agent, cracks and cracks are likely to occur in the film at the time of film formation. Water leakage occurs due to cracks and cracks in the film, so that waterproof performance cannot be sufficiently exhibited, and the formed coating film has insufficient followability to cracks in the base.

In the present invention, the Tg point of the copolymer is the temperature at which various properties of the amorphous polymer suddenly change. Below this temperature, the temperature at which the movement of the molecular segments of the amorphous portion of the polymer is frozen. It is. In order to actually measure the Tg point of the copolymer, as an example, the thermal expansion at various temperatures is measured, and the specific volume is plotted at each temperature. A general method for determining the temperature is used. However, since the value of the Tg point of a polymer composed of individual single monomers is actually known, the value of the Tg point of the copolymer can be obtained by the following formula.

[0021]

[Equation 1] 1 / Tg = CA / TgA + CB / TgB +
・ + CX / TgX

CA: weight fraction of component A CB: weight fraction of component B CX: weight fraction of component X TgA: Tg of component A homopolymer (° K) TgB: Tg of component B homopolymer ° K) TgX: Tg of component B homopolymer (° K) where CA + CB + ... + CX = 1.

The component (A) may be any one obtained by polymerizing the above monomer in the presence of a surfactant. As the surfactant, a cationic or nonionic surfactant is preferable in terms of excellent stability of the emulsion and adhesion to the substrate. Examples of the cationic surfactant that can be used in the present invention include trimethyloctadecyl ammonium chloride, trimethyl dodecyl ammonium chloride,
Quaternary ammonium salts such as trimethylhexadecyl ammonium chloride, alkyldimethylbenzylammonium chloride, distearyldimethylammonium chloride and trimethylstearylammonium chloride, and dimethyloctylamine, dimethyldecylamine, dimethyllaurylamine, dimethylmyristylamine, dimethylpalmitylamine And tertiary amines such as dimethylstearylamine, dimethyloleylamine, trioctylamine, N-methylmorpholin, dimethylbenzylamine and polyoxyethylene alkylamine.

As the nonionic surfactant, any of those commonly used for producing (meth) acrylic polymer emulsions can be used. Specifically, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether,
Sorbitan fatty acids such as polyoxyethylene alkyl or alkyl phenol ethers such as polyoxyethylene octyl phenol ether and polyoxyethylene nonyl phenol ether, sorbitan monostearate, sorbitan monolaurate, sorbitan distearate, sorbitan monooleate and sorbitan trioleate Examples include esters, polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monolaurate, polyethylene glycol fatty acid esters, and glycerin mono fatty acid esters. Among these, it is preferable to use a polyethylene oxide-based nonionic surfactant having an HLB value of 15 or more, since it is particularly excellent in polymerization stability, mechanical stability, and chemical stability.

The blending ratio of the surfactant may be appropriately adjusted according to the properties required for the copolymer emulsion, etc. In order to improve the stability of the emulsion, it is desirable that the blending amount of the surfactant is large. In order to improve the drying property and the water resistance of the coating film, the smaller the amount, the better.
A suitable compounding ratio is 1 to 5% by weight based on the copolymer in the emulsion.

Examples of the catalyst used in the production of the component (A) include radical polymerization catalysts, and include general nonionic catalysts and cationic catalysts. Of these, the cationic catalysts 2,2 ' It is preferred to use -azobis (2-amidinopropane). The component (A) may be produced by a general emulsion polymerization method.

The proportion of the copolymer in the component (A) is as follows:
40-65% by weight is preferred. When the amount is less than 40% by weight, the drying property becomes insufficient and the elongation of the coating film becomes insufficient. On the other hand, when the amount exceeds 65% by weight, gelation may occur in the production of the copolymer, In addition, the viscosity of the composition may increase, and the workability may decrease.

○ (B) Inorganic hydraulic substance The inorganic hydraulic substance is a substance in which a polyvalent metal such as Ca in this substance and the copolymer in the component (A) are crosslinked, and the drying property of the coating film and the It is a component that improves the adhesiveness, flexibility and strength of a coating film. Examples of the inorganic hydraulic substance include ordinary bolt land cement, land cement, early-strength cement, blast furnace cement, white cement, silica cement, fly ash cement, alumina cement, and other cements. Land cement and alumina cement are preferred. As the blending ratio of the inorganic hydraulic substance, the copolymer 100 in the component (A)
The amount is 10 to 150 parts by weight, preferably 40 to 90 parts by weight based on parts by weight. If this ratio is less than 10 parts by weight, the drying property and strength of the coating film will be reduced.
If the amount exceeds 50 parts by weight, the kneading property with the component (A) decreases, the workability decreases, and the physical properties of the coating film, particularly the elongation, deteriorate, and the film becomes unsuitable as a waterproof material.

(C) Inorganic Flame Retardant The inorganic flame retardant is a component that imparts flame retardancy to the coating film of the composition of the present invention, and is selected from metal hydroxides, metal oxides and metal salts. It is. Examples of the metal hydroxide include aluminum hydroxide and magnesium hydroxide, and examples of the metal oxide include antimony trioxide and antimony pentoxide. Examples of the metal salt include sodium antimonate, magnesium carbonate, and sulfuric acid. Examples include magnesium and barium metaborate. The inorganic flame retardant is 2
More than one species may be used in combination. Among these, aluminum hydroxide and antimony trioxide are preferable in that they are excellent in price and flame retardancy. The mixing ratio of the inorganic flame retardant was 8 parts by weight based on 100 parts by weight of the copolymer in the component (A).
0 to 200 parts by weight, preferably 90 to 160 parts by weight. If the proportion is less than 80 parts by weight, the coating film cannot be provided with flame retardancy, while if it exceeds 200 parts by weight, the strength of the coating film decreases and the water resistance decreases.

Other components In addition to the above essential components, the composition of the present invention also has improved kneading properties, improved coating properties, a sufficient coating thickness, and toughness and flexibility in the coating film. Aggregates can be added for the purpose of imparting and reducing the tack of the coating film. Specific examples of the aggregate include foams such as silica sand, talc, calcium carbonate, gypsum, diatomaceous earth, titanium oxide, silica, and pearlite.
Examples thereof include mica, ferrite, and carbon black. Further, a fibrous material can be blended if necessary. As the mixing ratio of the aggregate, the inorganic hydraulic substance 100
The amount is preferably from 20 to 200 parts by weight, more preferably from 30 to 115 parts by weight, based on parts by weight. If the amount is less than 20 parts by weight, the elongation and strength of the coating film may decrease, while if it exceeds 200 parts by weight, the flame retardancy may decrease. In addition to the aggregate, a thickening agent, a defoaming agent, a film-forming aid, a reaction retarder, a pigment, a dye, and the like, which are blended in an ordinary waterproof coating material, can also be added. Further, water can be further added for the purpose of adjusting the viscosity of the composition. Specifically, the total amount of the components (A), (B) and (C) is 10
It is preferably 10 parts by weight or less with respect to 0 parts by weight, and the viscosity of the composition of the present invention is essentially 4000 to 20000 c.
It is preferable to add an amount such that it becomes ps. Thereby, the coatability of the composition can be improved.

Production Method and Method of Use The composition of the present invention is a slurry comprising the components (A), (B) and (C), and comprises the components (A), (B) and (C) Alternatively, if necessary, these materials and the aggregate may be mixed according to a conventional method, and are usually manufactured by mixing each component at a construction site using a mixer. The method of applying the composition of the present invention may be in accordance with a method generally applied in a coating film waterproofing method, and specifically, a coating method using a brush, a roller brush, a rubber lake, or the like, or spraying using a spray gun. And the like. In the application, the viscosity of the composition of the present invention is preferably about 4,000 to 20,000 cps, because the thickness of the coating film can be increased by one application. The composition of the present invention can be applied to various substrates, and includes concrete, mortar, slate, metal, glass, plastic, and the like, and can be directly applied on a structure composed of these. Also, to improve the adhesion with the substrate,
It is preferable to apply after applying a suitable primer according to a conventional method. Other paints can be applied as a top coat to the coating film of the composition.

[0032]

The present invention will be described more specifically below with reference to examples and comparative examples. In the following, “parts” means “parts by weight” and “%” means “% by weight” unless otherwise specified. Production Example 1 (Production of copolymer emulsion) In a stainless steel reactor equipped with a stirrer having an internal volume of 500 L, 114.2 parts of ion-exchanged water was put, and the internal temperature was heated to 80 ° C. 231 parts of acrylate,
9 parts of methyl acrylate, 51 parts of styrene, 9 parts of N-methylolacrylamide, 5 parts of a polyoxyethylene nonylphenol ether (HLB: 18.9) surfactant as an emulsifier, 0.03 parts of a defoamer, and 1 part of ion-exchanged water
An aqueous solution comprising 1.2 parts of 2,2'-azobis (2-amidinopropane) hydrochloride and 10.8 parts of ion-exchanged water was continuously added as a polymerization initiator,
Polymerization was performed for 4 hours to obtain a copolymer emulsion. The obtained emulsion was a copolymer 5 having a Tg point of -58.3 ° C.
It had a viscosity of 256 cps and a pH of 5.7. (This emulsion is No. 1)

(Freeze-thaw stability) The above emulsion N
o. After placing 400 cc in a polyethylene bag and sealing, leave it in a thermo-hygrostat manufactured by Nagoya Scientific Instruments Co., Ltd.
After 8 cycles at 60 ° C. for 6 hours, the emulsion state was observed. As a result, no suspicious matter was generated and the viscosity was 290 cps, which was good.

Production Examples 2 to 5 (Production of Copolymer Emulsion) Copolymer emulsions were prepared in the same manner as in Production Example 1 except that the raw materials shown in Table 1 were used and used in the proportions shown in Table 1. Was manufactured.

[0035]

[Table 1]

1) to 7) in Table 1 have the following meanings. 1) Unit: part 2) NMAA: N-methylolacrylamide 3) NBAA: N- (butoxymethyl) acrylamide 4) TMHDAC: trimethylhexadecyl ammonium chloride 5) POENPE: polyoxyethylene nonylphenol ether (HLB: 18.5) 6 ) Catalyst: 2,2'-azobis (2-aminodipropane) 7) Defoamer: Nopco 267A, manufactured by San Nopco

Examples 1 to 7 Using the obtained copolymer emulsion, the components shown in Table 2 were stirred and mixed to produce a waterproofing composition. Various physical properties and coating film physical properties of the obtained composition were evaluated as follows. Table 3 shows the results.

Pot life The kneaded waterproofing composition is placed in a polyethylene cup and placed in a polyethylene cup.
The viscosity in the stationary state was measured by standing in a constant temperature chamber at 0 ° C., and the time when the viscosity became 30,000 cps or less was defined as the pot life (usable life).

Coating physical properties In accordance with JIS A 6021 “Test of acrylic rubber roofing coating agent”, at 20 ° C. and −
A tensile test was performed at 10 ° C., and the elongation and the tensile strength at each temperature were measured. For testing, thickness 1 ± 0.2m
m of coatings were used.

Swelling rate after immersion in water (water resistance / alkali resistance) A test piece was punched out from a coating film used in a tensile test on physical properties of the coating film with a dumbbell No. 3 mold, left in water for one week, and according to JIS. After the alkali treatment of A 6021, the length of the coating film immediately after removing the test piece was measured.

Flame retardancy Based on the test of the Fire Services Act, Dangerous Goods Related Criteria, "Judgment Criteria for Urethane Foam as a Heat Insulating Agent for Outdoor Storage Tanks", from the moment the burner is released until the fire of the test specimen goes out. Is the burning time, and the length at that time is the burning length.
Those with a burning time of 60 sec or less and a burning length of 60 mm or less were accepted.

· Weather resistance JIS A 141 according to JIS A 6021
The appearance of the coating film after 1000 hours of ultraviolet treatment with No. 5 was visually observed. ：: no change in the coating film, Δ: slight discoloration in the coating film, ×: cracks and discoloration in the coating film

Film-forming properties The resulting waterproofing composition was sprayed onto a slate plate of 300 × 300 × 3 mm coated with an epoxy primer and dried at 2 kg / m ² at 20 ° C., 60 ° C. % RH
, And a load test was performed to measure the curing time of the coating film. * Weight test: Stand a pencil on the coating surface and apply 1kg weight
Add 5 seconds and measure the time until almost no pencil mark is left on the coating surface.

[0044]

[Table 2]

1) to 6) in Table 2 have the following meanings. 1) The unit is part 2) PC: Portland cement, AC: Alumina cement The number in parentheses is the number of parts per 100 parts of the copolymer in the emulsion 3) Al: aluminum hydroxide, Sb: antimony trioxide The number in parentheses is 4) Milcon: natural fibrous clay mineral Anti-sagging material, trade name of Showa Mining Co., Ltd .; Milcon 5) Viscosity: slurry viscosity, unit is cps 6) PL: pot life

[0046]

[Table 3]

Comparative Examples 1 to 5 Compositions were produced in the same manner as in Example 1 except that the components shown in Table 4 were used. Table 5 shows the results of evaluating the obtained composition in the same manner as in Example 1. Comparative Example 1 The composition of Comparative Example 1 was an example in which the proportion of the inorganic flame retardant was small, and the test piece of the coating film was completely burned in a combustion test, and did not have flame retardancy. Comparative Example 2 The composition of Comparative Example 1 was an example in which the proportion of the inorganic hydraulic substance was blended in a large amount, and the coating film had flame retardancy, but the weather resistance was insufficient. It was inferior in flexibility. Comparative Example 3 The composition of Comparative Example 3 was an example in which a large amount of an inorganic flame retardant was blended, and although the coating film had flame retardancy, the coating film had strength,
It was inferior in water resistance and alkali resistance. Comparative Example 4 The composition of Comparative Example 4 was an example using a commercially available ethylene-vinyl acetate emulsion, and was inferior in the flame retardancy, low-temperature elongation, water resistance, and alkali resistance of the coating film. Comparative Example 5 In the composition of Comparative Example 5, the copolymer was not a copolymer of methyl (meth) acrylate or ethyl (meth) acrylate, and the proportions of the inorganic hydraulic substance and the inorganic flame retardant were the same as those of the present invention. In the examples, the coating film was inferior in flame retardancy, strength, elongation, water resistance and alkali resistance.

[0048]

[Table 4]

1) to 7) in Table 4 have the following meanings. 1) The unit is part 2) PC: Portland cement, AC: Alumina cement The number in parentheses is the number of parts per 100 parts of the copolymer in the emulsion 3) Al: aluminum hydroxide, Sb: antimony trioxide The number in parentheses is 4) Milcon: natural fibrous clay mineral Anti-sagging material, trade name of Showa Mining Co., Ltd .; Milcon 5) Viscosity: slurry viscosity, unit is cps 6) PL: pot life 7 ) Commercial product 1: Ethylene vinegar biemulsion, trade name of Nippon Synthetic Chemical Industry Co., Ltd .; Highflex # 1000 (solid content 50%)

[0050]

[Table 5]

[0051]

Industrial Applicability The composition of the present invention is excellent in safety without using a halogen-based monomer or polymer, has a fast coating film formation, and has an excellent flame retardancy. In addition, it has excellent performance required as a waterproof material such as weather resistance, strength, flexibility, water resistance and alkali resistance. Furthermore, when a cationic or nonionic emulsion is employed as an emulsion of the copolymer, it is excellent in freezing stability, and when an inorganic hydraulic substance, an inorganic flame retardant and an aggregate are blended, a sharp increase in viscosity or It has a sufficient pot life without gelling.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) C09D 133/12 C09D 133/12 133/26 133/26 C09K 3/18 101 C09K 3/18 101

Claims (1)

[Claims] (A) 20 to 90% by weight of an alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms, methyl (meth) acrylate and / or ethyl (meth) acrylate 0.1 to 8; Aqueous emulsion of a copolymer having an essential constituent monomer unit of 0.01 to 30% by weight of (meth) acrylamide represented by the following general formula and having a glass transition point of -20 ° C or lower, (B A) a slurry mixture comprising an inorganic hydraulic substance and (C) an inorganic flame retardant selected from metal hydroxides, metal oxides and metal salts, wherein the component (B) is a copolymer in the component (A) 10 to 150 parts by weight based on 100 parts by weight, and 80 to 2 parts by weight based on 100 parts by weight of the copolymer in the component (A).
A composition for waterproofing a flame-retardant coating film, wherein the composition is 00 parts by weight. Embedded image (However, R ¹ is hydrogen or a methyl group, and R ² is hydrogen or an alkyl group having 1 to 4 carbon atoms.)