JP4890127B2 - Emulsion composition for ALC rebar anti-rust treatment material - Google Patents

Description

  The present invention relates to an emulsion composition for an ALC rebar antirust treatment material capable of preparing a rebar antirust treatment material excellent in rust prevention, bond strength, viscosity stability, and rebar adhesion.

  When manufacturing lightweight aerated concrete (hereinafter referred to as “ALC”), first, a raw material slurry as a concrete raw material is injected into a formwork in which reinforcing reinforcing bars are set and foamed. After the concrete has hardened, ALC can be obtained by curing under high temperature and high pressure conditions using an autoclave.

  The ALC obtained in this way has a problem that moisture and salt are liable to enter inside through the formed bubbles, and the embedded reinforcing bars are easily corroded. In order to avoid such a problem, rust prevention treatment such as application of a rust inhibitor is performed on the reinforcing bars in advance.

  As a related prior art, there is a method in which a rust preventive material containing a retarder is used, and the reinforcing bars are coated with a rust preventive by delaying curing. Further, a rust preventive for reinforcing bars is disclosed which mainly contains an aqueous emulsion of a styrene resin and asphalt as a binder and an inorganic powder of alkaline earth carbonate (for example, see Patent Document 1).

However, even with these conventional rust preventive materials, it is the actual situation that satisfactory results have not yet been obtained with respect to the general characteristics as the rust preventive materials. Specifically, it has not been found that a rust-preventing material that exhibits the rust-proofing property and simultaneously exhibits the bond strength between the ALC concrete part and the reinforcing bar simultaneously. Further, a general rust preventive material is likely to change in viscosity with time after preparation, and its viscosity stability is not sufficiently satisfactory. Furthermore, since it may be difficult to form a rust preventive film in a uniform state, it is necessary to further improve the reinforcing bar adhesion.
JP-A-10-176292

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is rebar rust prevention excellent in rust prevention, bond strength, viscosity stability, and rebar adhesion. An object of the present invention is to provide an emulsion composition for an ALC rebar antirust treatment material capable of preparing a treatment material.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have found that a styrene-butadiene copolymer emulsion, a nonionic surfactant having one or more glass transition temperatures (Tg) within two specific temperature ranges, and It has been found that the above-mentioned problems can be achieved by mixing polycarboxylates at a specific ratio, and the present invention has been completed.

  That is, according to this invention, the emulsion composition for ALC rebar antirust processing materials shown below is provided.

  [1] (A) Styrene-butadiene copolymer emulsion having at least one glass transition temperature (Tg) in the range of −10 ° C. or more and less than 40 ° C. and 40 to 80 ° C., and (A) styrene -100 parts by mass (but as solid content) of butadiene copolymer emulsion (B1) 0.5-8 parts by mass of nonionic surfactant and (C) 0.2-6 parts by mass of polycarboxylate And an emulsion composition for an ALC rebar antirust treatment material.

  [2] The (A) styrene-butadiene copolymer emulsion (A1) has a glass transition temperature (Tg) in the range of −10 ° C. or higher and lower than 40 ° C. 90% by mass (however, as a solid content) and (A2) 10 to 70% by mass (however, solid) a styrene-butadiene copolymer emulsion having one or more glass transition temperatures (Tg) within the range of 40 to 80 ° C. (In the case of (A1) + (A2) = 100% by mass). The emulsion composition for an ALC rebar antirust treatment material according to the above [1].

  [3] (B2) The emulsion composition for an ALC rebar antirust treatment material according to [1] or [2], further including an anionic surfactant.

  [4] The emulsion composition for an ALC rebar antirust treatment material according to any one of [1] to [3], wherein the (B1) nonionic surfactant is a polyoxyethylene alkyl ether.

  [5] The emulsion composition for an ALC rebar antirust treatment material according to [4], wherein the polyoxyethylene alkyl ether has an HLB value of 10.0 to 18.9.

  The emulsion composition for an ALC rebar antirust treatment material of the present invention has an effect that a rebar antirust treatment material excellent in rust prevention, bond strength, viscosity stability, and rebar adhesion can be provided.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described below, but the present invention is not limited to the following embodiment, and is based on the ordinary knowledge of those skilled in the art without departing from the gist of the present invention. It should be understood that modifications and improvements as appropriate to the following embodiments also fall within the scope of the present invention.

1. One embodiment of the emulsion composition of the present invention is (A) −10 ° C. or more and less than 40 ° C. and 40 to 80 ° C. A styrene-butadiene copolymer emulsion having (Tg) (hereinafter also referred to as “component (A)”) and (B1) nonionic surfactant (hereinafter referred to as “B”) with respect to 100 parts by mass of the solid content of this component (A). , Containing 0.5 to 8 parts by mass (also referred to as “component (B1)”) and 0.2 to 6 parts by mass of (C) polycarboxylate (hereinafter also referred to as “component (C)”) It is. If the emulsion composition of this embodiment is used as an additive (additive for reinforcing steel anticorrosive material), a reinforcing steel anticorrosive treatment material excellent in anticorrosiveness, bond strength, viscosity stability, and reinforcing steel adhesion is prepared. Can do. The details will be described below.

((A) Styrene-butadiene copolymer emulsion)
The component (A) contained in the emulsion composition of this embodiment is a styrene-butadiene copolymer emulsion (SBR emulsion). This component (A) has one or more Tg in the range of −10 ° C. or more and less than 40 ° C. (in the low temperature range) and in the range of 40 to 80 ° C. (in the high temperature range). .

  As described above, by using the SBR emulsion having one or more Tg in the low temperature range and the high temperature range, not only the rust prevention property but also the bond strength, the viscosity stability, and the reinforcing bar adhesion were improved. It can be set as the emulsion composition for ALC reinforcing bars antirust processing materials which can prepare a reinforcing steel antirust processing materials.

  As an SBR emulsion having one or more Tg in the low temperature range and in the high temperature range, for example, a core portion composed of a first SBR having Tg in the low temperature range and a Tg in the high temperature range It is possible to use an emulsion comprising a so-called core / shell structure copolymer comprising a second SBR and a shell portion covering at least a part of the core portion.

  Further, as the SBR emulsion having one or more Tg in the low temperature range and the high temperature range, in addition to the emulsion containing the copolymer having the core / shell structure described above, (A1) −10 ° C. to 40 ° C. A styrene-butadiene copolymer emulsion (hereinafter also referred to as “component (A1)”) having one or more glass transition temperatures (Tg) within the range of less than, and (A2) one or more within the range of 40 to 80 ° C. A so-called blend containing a styrene-butadiene copolymer emulsion having a glass transition temperature (Tg) of (hereinafter also referred to as “component (A2)”) can be used. Even if the emulsion of any aspect is used, a desired effect is exhibited.

((A1) Styrene-butadiene copolymer emulsion)
The amount of the component (A1) contained in the component (A) is preferably 30 to 90% by mass as a solid content when the total of the component (A1) and the component (A2) is 100% by mass. More preferably, it is 30-70 mass%, and it is especially preferable that it is 30-60 mass%. When the amount of the component (A1) contained in the component (A) is less than 30% by mass, the bond strength (high temperature bond strength) particularly under high temperature conditions tends to decrease. On the other hand, if it exceeds 90% by mass, the reinforcing bar adhesion tends to decrease.

  The amount of the styrene unit contained in the SBR of the component (A1) is preferably 60 to 80% by mass and 62 to 78% by mass with respect to 100% by mass in total of the styrene unit and the butadiene unit. Further preferred. When the content of the styrene unit is less than 60% by mass, the high-temperature bond strength tends to decrease. Similarly, if it exceeds 80% by mass, the high-temperature bond strength tends to decrease.

  In addition, as a commercial item which can be used suitably as (A1) component, a brand name "JSR0589" (made by JSR company), a brand name "JSR0693" (made by JSR company), etc. can be mentioned, for example.

  Further, the SBR of the component (A1) may contain a small amount of “other structural unit” other than the styrene unit and the butadiene unit within a range not impairing the effects of the present invention. Examples of the monomer that can be used to form the “other structural unit” include methyl methacrylate, acrylonitrile, and acrylic acid ester.

  The amount of “other structural unit” that may be contained in the SBR of the component (A1) is preferably 20% by mass or less, and 15% by mass or less when the entire structural unit is 100% by mass. More preferably. When the content of “other structural unit” is more than 20% by mass, the viscosity stability of the obtained reinforcing steel rust preventive material tends to be lowered.

((A2) Styrene-butadiene copolymer emulsion)
The amount of the component (A2) contained in the component (A) is preferably 10 to 70% by mass as a solid content when the total of the component (A1) and the component (A2) is 100% by mass. More preferably, it is 30-70 mass%, and it is especially preferable that it is 40-70 mass%. When the amount of the component (A2) contained in the component (A) is less than 10% by mass, the high-temperature bond strength tends to decrease. On the other hand, if it exceeds 70% by mass, cracks tend to occur in the rust-preventing material film.

  The amount of the styrene unit contained in the SBR of the component (A2) is preferably 81 to 95% by mass and 82 to 93% by mass with respect to 100% by mass in total of the styrene unit and the butadiene unit. Further preferred. When the content of the styrene unit is less than 81% by mass, the viscosity stability of the reinforcing steel rust preventive material tends to decrease. On the other hand, if it exceeds 95% by mass, the viscosity stability of the reinforced anticorrosive material tends to be deteriorated.

  In addition, as a commercial item which can be used suitably as (A2) component, brand name "JSR640 (made by JSR company), brand name" JSR602 "(made by JSR company), etc. can be mentioned, for example.

  Further, the SBR of the component (A2) may contain a small amount of “other structural unit” other than the styrene unit and the butadiene unit within a range not impairing the effects of the present invention. Examples of the monomer that can be used for forming the “other structural unit” include the same monomers as those exemplified in the aforementioned component (A1).

  The amount of “other structural unit” that may be contained in the SBR component (A2) is preferably 20% by mass or less, and 15% by mass or less, assuming that the entire structural unit is 100% by mass. More preferably. When the content of “other structural unit” exceeds 20% by mass, the viscosity stability of the reinforced anticorrosive material tends to deteriorate.

((B1) nonionic surfactant)
The component (B1) contained in the emulsion composition for an ALC rebar antirust treatment material of this embodiment is a nonionic surfactant. Specific examples of the component (B1) include polyoxyethylene lauryl ether and polyoxyethylene oleyl ether represented by the following general formula (1). Of these, polyoxyethylene lauryl ether is preferable. These (B1) components can be used individually by 1 type or in combination of 2 or more types.
R—O (CH ₂ CH ₂ O) _n H (1)
(In the general formula (1), R is an alkyl group, and n is an added mole number, preferably an integer of 10 to 45)

  The amount of the component (B1) contained in the emulsion composition for ALC rebar antirust treatment material of the present embodiment is 0.5 to 8 parts by mass, preferably 100 parts by mass of the solid content of the component (A), preferably It is 2.0-7.0 mass parts, More preferably, it is 3.0-6.0 mass parts. When the amount of the component (B1) is less than 0.5 parts by mass, the viscosity stability of the reinforcing steel rust preventive material obtained by adding the emulsion composition for ALC reinforcing steel rust preventive material decreases. On the other hand, if it exceeds 8.0 parts by mass, the viscosity of the reinforcing steel anticorrosive treatment material decreases, the formed anticorrosion film becomes thin, and the bond strength decreases.

  When the polyoxyethylene alkyl ether is used as the component (B1), the HLB value is preferably 10.0 to 18.9, and more preferably 11.0 to 17.0. When the HLB value of the polyoxyethylene alkyl ether is less than 10.0, the viscosity stability tends to decrease. On the other hand, even if the HLB value exceeds 18.9, the viscosity stability tends to decrease.

((B2) anionic surfactant)
It is preferable that the emulsion composition of this embodiment further contains (B2) an anionic surfactant (hereinafter also referred to as “component (A2)”). By containing this (B2) component, the viscosity stability of the reinforcing bar antirust processing material obtained by adding this emulsion composition for ALC reinforcing steel antirust processing material can further be improved.

Specific examples of the component (B2) include dodecylbenzenesulfonic acid, potassium oleate, and long-chain sulfosuccinic acid represented by the following structural formula (2). Among these, long-chain sulfosuccinic acid represented by the following structural formula (2) is preferable. These (B2) components can be used individually by 1 type or in combination of 2 or more types.
_{CH 2 CONC 18 H 37 -CHCOONa-} SO 3 Na (2)

  The content of the component (B2) is preferably 0.5 to 8 parts by mass and more preferably 0.7 to 5.0 parts by mass with respect to 100 parts by mass of the solid content of the component (A). Preferably, it is particularly preferably 1.0 to 4.0 parts by mass. When the amount of the component (B2) is less than 0.5 parts by mass, the effect of containing the component (B2) tends to be insufficiently exhibited. On the other hand, if it exceeds 6 parts by mass, the viscosity of the reinforced anticorrosive treatment material decreases, the formed anticorrosion film becomes thin, and the bond strength tends to decrease.

((C) polycarboxylate)
The component (C) contained in the emulsion composition for an ALC rebar antirust treatment material of the present embodiment is a polycarboxylate. As this (C) component, a sodium salt, potassium salt, an amine salt etc. can be mentioned, for example. These (C) components can be used singly or in combination of two or more.

  The amount of the component (C) contained in the emulsion composition for ALC rebar antirust treatment material of the present embodiment is 0.2 to 6.0 parts by mass with respect to 100 parts by mass of the solid content of the component (A), Preferably it is 0.5-5.0 mass parts, More preferably, it is 1.0-4.0 mass parts. When the amount of the component (C) is less than 0.2 parts by mass, the viscosity stability of the reinforcing agent for rust prevention obtained by adding the emulsion composition for ALC reinforcing steel rust prevention treatment material is lowered. On the other hand, if it exceeds 6.0 parts by mass, the viscosity of the reinforcing agent for rust prevention is reduced, the formed rust prevention film becomes thin, and the bond strength is reduced.

(Other ingredients)
The emulsion composition for an ALC rebar antirust treatment material of the present embodiment can contain other components as long as the effects of the present invention are not impaired. Examples of other components include antifoaming agents, preservatives, pigments, thickeners, dispersants, antifreezing agents and the like.

  Specific examples of the antifoaming agent include silicon-based, mineral oil-based, fatty acid-based or higher alcohol-based antifoaming agents, nonionic surfactants, and the like. These antifoaming agents can be used alone or in combination of two or more.

  Specific examples of the preservative include benzoisothiazoline (BIT) type and methylisothiazoline (MIT) type. These preservatives can be used singly or in combination of two or more.

2. Reinforcing Bar Antirust Treatment Material Next, an embodiment of a reinforcing steel antirust treatment material obtained using the emulsion composition for an ALC rebar antirust treatment material of the present invention will be described. The reinforcing steel rust preventive material of this embodiment is contained in (D) the emulsion composition for ALC reinforcing steel rust preventive material (hereinafter also referred to as “component (D)”) and the component (D) (A). ) Asphalt emulsion (hereinafter also referred to as “(E) component”) and (F) inorganic filler (hereinafter referred to as “(F) component”) as needed, with respect to 100 parts by mass of component (but as solid content). Can also be added). Since the reinforcing bar rust preventive material of this embodiment contains the emulsion composition (component (D)) for the above-mentioned ALC reinforcing bar rust preventive material, it has excellent rust preventive properties, bond strength, viscosity stability, and reinforcing bar adhesion. It shows sex. In particular, the bond strength under high temperature conditions (adhesive strength between the ALC concrete part and the reinforcing bars) is improved, so ALC can be moved even in a high temperature state immediately after curing in an autoclave, and the temperature decrease waiting time can be shortened. There are advantages such as. Hereinafter, the detail of the reinforcing bar rust prevention processing material of this embodiment is explained.

((E) asphalt emulsion)
The (E) component contained in the reinforcing steel rust preventive material of this embodiment is an asphalt emulsion. By including this (E) component, the adhesiveness with respect to the reinforcing bar of a reinforcing bar antirust processing material improves.

  As the component (E), a conventionally known asphalt emulsion can be used. In addition, (E) component can be used individually by 1 type or in combination of 2 or more types. Examples of commercially available products that can be suitably used as component (E) include, for example, the trade name “Assol M” (manufactured by Nichireki Co., Ltd.), the trade name “Aniazole” (manufactured by Nichireki Co., Ltd.), Petroleum products).

((F) inorganic filler)
The (F) component contained in the reinforcing steel rust preventive material of this embodiment is an inorganic filler. Specific examples of the component (F) include calcium carbonate and aluminum hydroxide. These inorganic fillers can be used alone or in combination of two or more.

(Other ingredients)
The reinforcing steel rust preventive material of this embodiment can contain other components as long as the effects of the present invention are not impaired. Examples of other components include antifoaming agents, antiseptics, rust inhibitors, pH adjusters, pigments, thickeners, dispersants, antifreeze agents, and the like.

  As a specific example of an antifoamer, the thing similar to what was illustrated as a specific example of the antifoamer which can be contained in the above-mentioned emulsion composition for ALC rebar antirust processing materials can be mentioned.

  Specific examples of the preservative include the same as those exemplified as specific examples of the preservative that can be contained in the above-described emulsion composition for ALC rebar antirust treatment materials.

  As a rust preventive agent, the conventionally well-known rust preventive agent contained in a general rebar rust preventive agent can be used. Specific examples of the rust inhibitor include lithium nitrite, calcium nitrite, and oxycarboxylate. These rust preventives can be used singly or in combination of two or more.

  As the pH adjuster, a conventionally known pH adjuster contained in a general reinforcing steel rust preventive material can be used. Specific examples of the pH adjuster include potassium hydroxide, sodium hydroxide, slaked lime, and the like. These pH adjusters can be used singly or in combination of two or more. In addition, the usage-amount of a pH adjuster is suitably set to the quantity from which the pH of the reinforcing bar antirust processing agent obtained becomes a desired value.

(Preparation of rebar antirust treatment materials)
The reinforcing steel anticorrosive treatment material of this embodiment mixes the component (D), the component (E), the component (F), and other components and solvents, which are added as necessary, according to a conventionally known method. Can be prepared. The solid content concentration of the reinforcing steel rust preventive material to be obtained is usually 70.0 to 82.0% by mass, preferably 72.0 to 80.0% by mass. Moreover, pH of the reinforcing steel rust prevention processing material obtained is normally adjusted to 10.0-14.0, Preferably it is 11.0-13.0. Furthermore, the viscosity of the reinforcing steel rust preventive material obtained is usually 2000 to 7000 mPa · s, preferably 2500 to 6000 mPa · s.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples. In the examples and comparative examples, “parts” and “%” are based on mass unless otherwise specified. Moreover, the measuring method of various physical-property values and the evaluation method of various characteristics are shown below.

  [Viscosity]: Using a BM viscometer, the viscosity (mPa · s) of the reinforcing steel anticorrosive material at the initial stage of preparation (after 1 day) and 3 days after preparation was measured.

[Rust prevention]: The salt water test shown below was performed, and the rust prevention was evaluated according to the following criteria.
Salt water test: After immersing the reinforcing bar coated with reinforcing steel anti-rust treatment material in 0.1% calcium chloride aqueous solution for 14 days in normal condition, peel off the anti-rust film on the reinforcing bar surface by hand, and observe the rust state of the reinforcing bar did.
○: Rust was not generated ×: Rust was generated even at one point

[Bond strength]: After reinforcing steel bars (diameter 6 mm, length 400 mm) were applied to the reinforcing steel anticorrosive treatment material, it was dried with a dryer at 40 ° C. for 1 hour. Next, the second liquid application was performed, and the mixture was dried with a dryer at 50 ° C. for 1 hour. The obtained rebar after the treatment was fixed to a small formwork, and after pouring the ALC slurry, autoclave curing was performed to produce ALC with rebar. The manufactured ALC containing a reinforcing bar was cut into a prismatic shape having a length of 150 mm and a length and width of 50 mm so that the reinforcing bar was at the center. A load was applied to the reinforcing bar portion under normal conditions (20 ° C.) and high temperature (75 ° C.) with respect to the obtained ALC reinforcing bar containing a prismatic reinforcing bar, and the bond strength (adhesion strength ( N / mm ² )) was measured.

[Reinforcing Bar Adhesion]: The adhesion state of the reinforced anticorrosive material to the reinforcing bars was evaluated by touch according to the following criteria.
○: Adhesion good △: Slightly brittle, somewhat poor adhesion ×: Adhesion is considerably poor and easy to remove

  [Rust-proof film thickness]: 200-300 μm so that the viscosity and the change with time are good. Considering cost and performance, it is set to 240 μm. A cycle of dipping and drying the reinforcing bar in the reinforcing steel antirust treatment material was repeated twice. The thickness of the rust preventive film formed on the reinforcing bar surface was measured at the initial stage of formation (after 1 day) and after 3 days of formation.

(Various components and reagents)
In preparing the emulsion composition and the reinforcing steel rust preventive material, the following various components and reagents were used.
[1] SBR emulsion (1): trade name “JSR0589”, manufactured by JSR, Tg = 5 ° C., solid content concentration = 50.0%
[2] SBR emulsion (2): trade name “JSR0640”, manufactured by JSR, Tg = 56 ° C., solid content concentration = 48.3%
[3] SBR emulsion (3): trade name “JSR0568”, manufactured by JSR, Tg = −22 ° C., solid content = 50.8%
[4] SBR emulsion (4): trade name “JSR0579”, manufactured by JSR, Tg = 88 ° C., solid content = 54.3%
[5] Polyoxyethylene alkyl ether: trade name “Emulgen 1118S-25”, manufactured by Kao Corporation, HLB = 16.4
[6] Sodium polycarboxylate: trade name “SN Dispersant 5045”, manufactured by San Nopco

1. Preparation of emulsion composition for ALC rebar antirust treatment material (Example 1)
By mixing 70 parts of SBR emulsion (1) (Tg: 5 ° C.), 30 parts of SBR emulsion (2) (Tg: 56 ° C.), 3 parts of polyoxyethylene alkyl ether and 2 parts of sodium polycarboxylate, ALC An emulsion composition (H-1) for reinforcing steel anticorrosive treatment material was prepared.

(Examples 2-3, Comparative Examples 1-6)
Except making it the compounding prescription shown in Table 1, it carried out similarly to the case of the above-mentioned Example 1, and the emulsion composition for ALC rebar antirust processing materials (H-2 ~ H-3, R-1 ~ R-6). ) Was prepared.

2. Preparation of reinforced anticorrosive material (Example 4)
By mixing 105 parts of the emulsion composition for ALC rebar antirust treatment material prepared in Example 1 (H-1), 130 parts of asphalt emulsion, and 900 parts of inorganic filler, rebar antirust treatment material (Example 4) ) Was prepared. The prepared reinforcing steel rust preventive material had a solid content concentration of 76.1%, a pH of 12.2, a viscosity (initial) of 4600 mPa · s, and a viscosity (after 3 days) of 3600 mPa · s.
It can be mentioned that additives for rust preventives; calcium hydroxide, titanium dioxide, ethylene glycol, etc. are used in addition to the above.

The ALC reinforcing bars were immersed in the prepared reinforcing steel rust preventive material, and the rust prevention treatment for the reinforcing bars was performed. As a result, the evaluation of rust prevention is “◯”, the bond strength (normal state) is 1.7 N / mm ² , the bond strength (high temperature) is 0.6 N / mm ² , and the evaluation of rebar adhesion is “○”. The rust film thickness (initial) was 272 μm, and the rust film thickness (after 3 days) was 233 μm.

(Examples 5 and 6, Comparative Examples 7 to 12)
Reinforcing bar anti-rust treatment materials (Examples 5 and 6, Comparative Examples 7 to 12) were prepared in the same manner as in Example 4 except that the formulation shown in Table 2 was used. Table 2 shows various physical property values of the prepared reinforcing steel material. Moreover, the rust prevention process with respect to the reinforcing bar was implemented using the prepared reinforcing steel rust prevention material. Various evaluation results are shown in Table 2.

  From the results shown in Table 2, the reinforcing steel rust preventive materials of Examples 4 to 6 prepared using the emulsion compositions for ALC reinforcing steel rust preventive materials of H-1 to H-3 are R-1 to R-6. Compared to the reinforcing steel anticorrosive treatment materials of Comparative Examples 7 to 12 prepared using the emulsion composition for ALC reinforcing steel anticorrosive treatment material, excellent antirust properties, bond strength, viscosity stability, and reinforcing steel adhesion It is clear that it has.

  The rebar rust preventive material of the present invention is suitable mainly as a rust preventive material for rusting ALC reinforcing steel bars, general reinforcing steel bars for reinforced concrete, and the like.

Claims (5)

(A) a styrene-butadiene copolymer emulsion having a glass transition temperature (Tg) of -10 ° C. or more and less than 40 ° C. and 40 to 80 ° C., respectively,
With respect to 100 parts by mass (however, as a solid content) of the (A) styrene-butadiene copolymer emulsion,
(B1) 0.5-8 parts by weight of a nonionic surfactant;
(C) 0.2-6 parts by mass of a polycarboxylate;
An emulsion composition for an ALC rebar antirust treatment material containing The (A) styrene-butadiene copolymer emulsion is
(A1) 30 to 90% by mass (as solid content) of a styrene-butadiene copolymer emulsion having one or more glass transition temperatures (Tg) within a range of −10 ° C. or more and less than 40 ° C. (A2) 40 to Styrene-butadiene copolymer emulsion having a glass transition temperature (Tg) within a range of 80 ° C. within a range of 10 to 70% by mass (however, as a solid content),
(However, (A1) + (A2) = 100 mass%) The emulsion composition for ALC rebar antirust processing materials of Claim 1 characterized by the above-mentioned.   (B2) The emulsion composition for ALC rebar antirust treatment materials according to claim 1 or 2, further comprising an anionic surfactant.   The emulsion composition for an ALC rebar antirust treatment material according to any one of claims 1 to 3, wherein the (B1) nonionic surfactant is a polyoxyethylene alkyl ether.   The emulsion composition for an ALC rebar antirust treatment material according to claim 4, wherein the polyoxyethylene alkyl ether has an HLB value of 10.0 to 18.9.