JP4108264B2 - Cement modifier and resin mortar composition - Google Patents
Cement modifier and resin mortar composition Download PDFInfo
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- JP4108264B2 JP4108264B2 JP2000303971A JP2000303971A JP4108264B2 JP 4108264 B2 JP4108264 B2 JP 4108264B2 JP 2000303971 A JP2000303971 A JP 2000303971A JP 2000303971 A JP2000303971 A JP 2000303971A JP 4108264 B2 JP4108264 B2 JP 4108264B2
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- cement
- resin
- formalin condensate
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- powder resin
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、セメントモルタルに再乳化形粉末樹脂を添加した樹脂モルタルに関する。更に詳しくは、例えば建築物の下地調整用材料、タイル貼り用接着剤等として利用されるものであり、作業性に優れ、且つ高強度を発現する樹脂モルタル組成物に関するものである。
【０００２】
【従来の技術】
コンクリート構造物の下地調整用材料、タイル貼り用接着剤等に要求される性能は、硬化が早く、下地コンクリートに対する付着性が高いことであり、コンクリート中のアルカリに対する抵抗性が大きく耐久性が良いことである。更に施工時の作業性が良く、低価格であることが望まれる。
これらの要求性能を満足させるため、数多くの材料の開発が進んでいるが、性能及び価格面で、普通モルタルにラテックスポリマーを加えた樹脂モルタルの使用頻度が近年一段と増す傾向にある。
【０００３】
樹脂モルタルの性能は普通モルタルに比較し、1)接着強さが高い、2)曲げ引っ張り強さが高い、変形能が向上する、3)透水量及び吸水量が低下し、防水性能が向上する、4)乾燥収縮量が低減する、5)耐衝撃性、耐磨耗性が向上する、等の改良された点が多く挙げられる。
但し、ラテックスは液状であるため容器に入れて移動させ、またセメントモルタルに添加する場合、現場で調合する必要がある。これにともない、使用後のラテックス容器の廃棄問題、また現場における調合ミスの発生問題などが、最近特に取り上げられるようになった。
【０００４】
これらの課題に対して、現場で配合するラテックスの代わりに、再乳化形粉末樹脂を使用するようになって来た。ここで言う再乳化形粉末樹脂とは、水に投入することにより、再乳化し得る樹脂を指す。再乳化形粉末樹脂は、例えばセメント、充填材等に事前に配合されていて、現場で水を投入するだけでよく、そのセメント硬化後の性能は、ほぼラテックスを配合する樹脂モルタルと同等の性能を発揮する。
【０００５】
しかしながら、従来使用されている再乳化形粉末樹脂は、セメントモルタルに配合した場合、コテ塗り作業性が不良であるという問題点を有している。ちなみに再乳化形粉末樹脂を配合しない普通モルタルの場合コテ塗り作業性は問題ない。ここで言うコテ塗り作業性は、再乳化形粉末樹脂を配合した樹脂モルタルの経時での粘度変化と、コテでの作業性の二つを含むものである。これに対して、特公昭５１−４６１２６号公報では、再乳化形粉末樹脂を製造する際、メラミンスルホン酸塩のホルマリン縮合物を添加する技術が開示されているが、コテ塗り作業性の改良については記載はない。
【０００６】
【発明が解決しようとする課題】
本発明は、ラテックス容器の廃棄問題、現場での調合ミスを解決でき、さらにはコテ塗り作業性が良好で、かつコンクリートに対する接着性が良好な樹脂モルタル組成物を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明者は、前記課題を解決するため、セメントモルタルに配合する再乳化形粉末樹脂に、特定の添加剤を特定量配合することにより、コテ塗り作業性、接着性が向上することを見いだし、本発明をなすに至った。
すなわち、本発明は、
発明１．再乳化形粉末樹脂、メラミンスルホン酸塩のホルマリン縮合物、及びナフタレンスルホン酸塩のホルマリン縮合物を含み、該メラミンスルホン酸塩のホルマリン縮合物／該再乳化形粉末樹脂の質量比率が、１／２００〜１／１０であり、且つ該メラミンスルホン酸塩のホルマリン縮合物とナフタレンスルホン酸塩のホルマリン縮合物との質量比率が２／１〜１／４であり、該ナフタレンスルホン酸塩のホルマリン縮合物／該再乳化形粉末樹脂の質量比率が、１／１００〜１／１０であるセメント改質剤。
発明２．セメント１００質量部に対し、充填材が５〜６００、及び再乳化形粉末樹脂を１〜５０質量部含む発明１のセメント改質剤を含む樹脂モルタル組成物である。
【０００８】
【発明の実施の形態】
本発明について、以下具体的に説明する。
本発明で用いられる再乳化形粉末樹脂とは、水に投入することにより、再乳化する樹脂を指し、ＪＩＳ Ａ ６２０３に定義されるセメント混和用再乳化形粉末樹脂と同等の意味を持つ。再乳化形粉末樹脂は、例えば「ポリマー混入セメント」（徳本 実著、高分子刊行会（１９９５））の第５１頁に記載の方法で製造されている。樹脂成分として特に限定されるものではなく、例えば酢酸ビニル系、エチレン−酢酸ビニル系、酢酸ビニル−ベオバ系、アクリル系、アクリル−スチレン系等が使用することができる。
【０００９】
本発明に用いられるメラミンスルホン酸塩のホルマリン縮合物は、別途メラミン樹脂スルホン酸塩とも呼ばれるもので、例えば「ポリマー混入セメント」（徳本 実著、高分子刊行会（１９９５））の第６０頁に代表的な構造が記載されている。また、本発明に用いられるナフタレンスルホン酸塩のホルマリン縮合物の代表的な構造も同頁に記載されている。これら以外にも、各々の変成物も含まれる。
【００１０】
本願発明のメラミンスルホン酸塩のホルマリン縮合物と再乳化形粉末樹脂との質量比率は、１／２００〜１／１０である。１／２００以上でコテ塗り作業性に問題なく、１／１０以下で耐水接着性に問題がない。好ましくは１／１００〜１／２０である。
また、本願発明のナフタレンスルホン酸塩のホルマリン縮合物と再乳化形粉末樹脂との質量比率は、１／１００〜１／１０である。１／１００以上でコテ塗り作業性に問題なく、１／１０以下で耐水接着性に問題がない。好ましくは１／５０〜１／１２．５である。
【００１１】
メラミンスルホン酸塩のホルマリン縮合物とナフタレンスルホン酸塩のホルマリン縮合物との質量比率は、好ましくは、メラミンスルホン酸塩のホルマリン縮合物とナフタレンスルホン酸塩のホルマリン縮合物との質量比率が２／１〜１／４である。
本発明に用いられるセメントとしては、例えば普通ポルトランドセメント、白色ポルトランドセメント、早強ポルトランドセメント、アルミナセメント、高炉セメント、フライアッシュセメント等種々のセメントを使用できる。
【００１２】
充填材としては、一般的にセメントモルタルに用いられる砂、珪砂、寒水砂、天然及び人工軽量骨材等が使用できる。またその使用量は５〜６００質量部であり、５質量部以上で、強度の増加と、乾燥に伴うひび割れに問題ない。一方、６００質量部以下で、強度に問題がない。好ましくは５０〜５００質量部の範囲である。
本発明で用いられる再乳化形粉末樹脂とセメントとの比率は、セメント１００質量部に対して再乳化形粉末樹脂が１〜５０質量部である。再乳化形粉末樹脂１質量部以上で接着性に問題がなく、５０質量部以下でコテ塗り作業性に問題がない。好ましくは再乳化形粉末樹脂２〜２５質量部でる。
【００１３】
本発明の樹脂モルタル組成物は、上記の成分に限定されるものではなく、他のいかなる成分を添加するようにしても良い。例えば、収縮低減剤（グリコールエーテル系、ポリエーテル系等）、耐寒剤（塩化カルシウム等）、防水剤（ステアリン酸等）、防錆剤（リン酸塩等）、粘度調整剤（メチルセルロース、ヒドロキシエチルセルロース、ポリビニルアルコール等）、凝結調整剤（リン酸塩等）、膨張剤（エトリンガイト系、石灰系等）、着色剤（酸化鉄、酸化クロム等）、消泡剤（シリコン系、鉱油系等）、補強材（鋼繊維、ガラス繊維、合成繊維等）、界面活性剤（アニオン、ノニオン、カチオン系等）等である。
【００１４】
本発明の樹脂モルタル組成物の用途は特に限定されるものではない。例えば、下地調整材、タイル接着用、防錆、防水、グラウト用、パテ用、セルフレベリング床用、耐磨耗性床用、デッキカバリング用、弾性モルタル用、塗料用、防食用、成型品用などが挙げられる。
本発明を実施例に基づいて説明する。本発明の実施態様は、これらによって限定されるものではない。なお、例中の部数、混合割合などはすべて固形分で示した。また、「部」は特に断らない限り「質量部」を示すものである。
【００１５】
各特性は次ぎのようにして求めた。
（１）コテ塗り作業性試験
ａ．コテ作業性：表１、表３に示す樹脂モルタル組成物を作製した後に、コテ離れ、コテ伸び等総合して評価した。５段階評価とし、４以上を合格とした。
５：良好
３：やや不良
１：不良
ｂ．配合品粘度変化：表１、表３に示す樹脂モルタル組成物を作製した後、２０℃に放置し、攪拌可能な時間を測定した。
攪拌可能１時間以上を合格とした。
【００１６】
（２）曲げ強さ試験
表１、表３に示す樹脂モルタル組成物を作製した後、１０×２５×１５０ｍｍの供試体を作製し、３点曲げ試験により曲げ強さを測定した。
【００１７】
（３）割れ発生の状態
ＪＩＳ Ａ５３０４に規定するコンクリート平板に、２ｍｍ厚で表１、表３の樹脂モルタル組成物を塗りつけ、１日後（２０℃／６５％ＲＨ条件下）の割れ発生の状態を観察した。評価は以下を基準に５段階で評価した。３以上を合格とした。
５：割れの発生なし
３：一部に割れが発生
１：全面に割れが発生
【００１８】
（４）コンクリートへの接着性（常態接着及び耐水接着強さ）
割れ発生の状態３以上の試料を２０℃６５％ＲＨの恒温室で１４日間養生した後、建研式引っ張り試験器で樹脂モルタル組成物の接着強さを測定した（常態接着強さ）。さらに２０℃の水中に２４時間浸漬し、湿潤状態のままで耐水強度を測定した（耐水接着強さ）。
常態で１．０Ｎ／ｍｍ2以上、、耐水で０．５Ｎ／ｍｍ2以上を合格とした。
【００１９】
【実施例１〜１０】
セメント１００質量部に対し、表１に記載の樹脂モルタル組成物を調整し、コテ塗り作業性試験（コテ作業性、配合品粘度変化）、曲げ強さ試験、割れ発生、コンクリートへの接着性（常態接着及び耐水接着強さ）を行った。評価結果を表２に示す。
使用した原材料は、以下の通りである。
【００２０】
セメント：普通ポルトランドセメント（太平洋セメント株式会社製）
再乳化形粉末樹脂：ビィナパスＲＥ５１０Ｚ（エチレン−酢ビ系：ワッカーケミカルズイーストアジア株式会社製）
ビィナパスＬＬ５６４（アクリル系：ワッカーケミカルズイーストアジア株式会社製）
メラミンスルホン酸塩のホルマリン縮合物：メルメントＦ１０Ｍ（昭和電工株式会社製）
ナフタレンスルホン酸塩のホルマリン縮合物：マイティ１００（花王株式会社製）
充填材 ：珪砂６号（一般市販品）
水 ：水道水
ラテックス：ポリトロンＡ１５００（アクリルスチレン系：旭化成工業株式会社製、固形分４５％）
メチルセルロース：ｈｉメトローズ９０ＳＨ４００（信越化学工業株式会社製）
【００２１】
【比較例１〜５】
セメント１００質量部に対し、表３に記載の樹脂モルタル組成物を調整し、コテ塗り作業性試験（コテ作業性、配合品粘度安定性）、曲げ強さ試験、割れ発生、コンクリートへの接着性（常態接着及び耐水接着強さ）を、実施例と同様に行った。評価結果を表４に示す。
比較例５はラテックスを用いた例である。性能的には問題ないものの、やはりラテックス使用後の容器は、業者に廃棄委託を行い問題であった。
【００２２】
【表１】
【表２】
【表３】
【表４】
【発明の効果】
本発明のセメント改質剤を用いることにより、従来の再乳化形粉末樹脂を含む樹脂モルタルで問題であったコテ塗り作業性（コテ塗り性、モルタル配合物の粘度変化）、及び下地コンクリートに対する接着強さを大きく向上させる効果を有する。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin mortar obtained by adding a re-emulsifying powder resin to cement mortar. More specifically, the present invention relates to a resin mortar composition that is used, for example, as a base preparation material for buildings, an adhesive for tiling, and the like, has excellent workability and exhibits high strength.
[0002]
[Prior art]
The performance required for materials for adjusting the foundation of concrete structures, adhesives for tiling, etc. is that they are fast-curing and have high adhesion to the concrete, and have high resistance to alkali in the concrete and good durability. That is. Furthermore, it is desirable that the workability during construction is good and the price is low.
In order to satisfy these required performances, many materials have been developed. However, in terms of performance and price, the frequency of use of resin mortar in which latex polymer is added to ordinary mortar has been increasing in recent years.
[0003]
Resin mortar performance compared to ordinary mortar: 1) High adhesive strength, 2) High bending tensile strength, improved deformability, 3) Reduced water permeability and water absorption, and improved waterproof performance 4) There are many improved points such as 4) reduced drying shrinkage, 5) improved impact resistance and wear resistance.
However, since latex is in a liquid state, it must be moved in a container and added to cement mortar. Along with this, the problem of disposal of latex containers after use and the problem of occurrence of formulation errors in the field have recently been particularly addressed.
[0004]
In response to these problems, a re-emulsified powder resin has been used instead of the latex compounded in the field. The re-emulsifying powder resin referred to here refers to a resin that can be re-emulsified by being poured into water. For example, re-emulsified powder resin is pre-mixed in cement, filler, etc., and it is only necessary to add water on site, and its performance after hardening of the cement is almost equivalent to that of resin mortar containing latex. Demonstrate.
[0005]
However, conventionally used re-emulsifying powder resins have a problem that the ironing workability is poor when blended with cement mortar. Incidentally, in the case of ordinary mortar that does not contain a re-emulsifying powder resin, there is no problem with the ironing workability. The ironing workability mentioned here includes two things: the viscosity change with time of the resin mortar containing the re-emulsified powder resin, and the workability with the iron. On the other hand, Japanese Patent Publication No. 51-46126 discloses a technique of adding a formalin condensate of melamine sulfonate when producing a re-emulsified powder resin. Is not described.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a resin mortar composition that can solve the problem of disposal of latex containers and on-site formulation mistakes, and that has good troweling workability and good adhesion to concrete.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present inventor has found that the reworkability powder resin to be blended with cement mortar improves the workability and adhesiveness of ironing by blending a specific amount of a specific additive, It came to make this invention.
That is, the present invention
Invention 1. A re-emulsified powder resin, a formalin condensate of melamine sulfonate, and a formalin condensate of naphthalene sulfonate, wherein the mass ratio of the formalin condensate of melamine sulfonate / the re-emulsified powder resin is 1 / 200 to 1/10 , and the mass ratio of formalin condensate of melamine sulfonate and formalin condensate of naphthalene sulfonate is 2/1 to 1/4 , and formalin condensation of naphthalene sulfonate A cement modifier having a mass ratio of the product / the re-emulsified powder resin of 1/100 to 1/10.
Invention 2. It is a resin mortar composition containing the cement modifier of invention 1 containing 5 to 600 fillers and 1 to 50 parts by mass of a re-emulsifying powder resin with respect to 100 parts by mass of cement.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be specifically described below.
The re-emulsifying powder resin used in the present invention refers to a resin that is re-emulsified by being poured into water, and has the same meaning as the re-emulsifying powder resin for cement admixture defined in JIS A 6203. The re-emulsified powder resin is produced, for example, by the method described on page 51 of “Polymer-Containing Cement” (Motoru Tokumoto, Kobunshi Kokai (1995)). The resin component is not particularly limited, and for example, vinyl acetate, ethylene-vinyl acetate, vinyl acetate-veova, acrylic, acryl-styrene, and the like can be used.
[0009]
The formalin condensate of melamine sulfonate used in the present invention is also referred to as melamine resin sulfonate, which is described in, for example, “Polymer-Containing Cement” (Motoru Tokumoto, Polymer Publishing Association (1995)), page 60. A typical structure is described. The typical structure of the formalin condensate of naphthalenesulfonate used in the present invention is also described on the same page. In addition to these, each modification is also included.
[0010]
The mass ratio between the formalin condensate of melamine sulfonate and the re-emulsified powder resin of the present invention is 1/200 to 1/10. At 1/200 or more, there is no problem in the ironing workability, and at 1/10 or less, there is no problem in water-resistant adhesion. Preferably it is 1/100 to 1/20.
Moreover, the mass ratio of the formalin condensate of naphthalenesulfonate of the present invention and the re-emulsified powder resin is 1/100 to 1/10. At 1/100 or more, there is no problem in the ironing workability, and at 1/10 or less, there is no problem in water-resistant adhesion. Preferably it is 1/50 to 1 / 12.5.
[0011]
The mass ratio between the formalin condensate of melamine sulfonate and the formalin condensate of naphthalene sulfonate is preferably 2 / mass ratio of the formalin condensate of melamine sulfonate and the formalin condensate of naphthalene sulfonate. 1-1 / 4.
As the cement used in the present invention, various cements such as ordinary Portland cement, white Portland cement, early-strength Portland cement, alumina cement, blast furnace cement, fly ash cement and the like can be used.
[0012]
As the filler, sand, quartz sand, cold water sand, natural and artificial lightweight aggregates and the like generally used for cement mortar can be used. Moreover, the usage-amount is 5-600 mass parts, and is 5 mass parts or more, and there is no problem in the increase in intensity | strength and the crack accompanying drying. On the other hand, there is no problem in strength at 600 parts by mass or less. Preferably it is the range of 50-500 mass parts.
The ratio of the re-emulsifying powder resin and cement used in the present invention is 1 to 50 parts by mass of the re-emulsifying powder resin with respect to 100 parts by mass of cement. There is no problem in adhesiveness when the re-emulsified powder resin is 1 part by mass or more, and there is no problem in the ironing workability when it is 50 parts by mass or less. Preferably, it is 2 to 25 parts by mass of the re-emulsified powder resin.
[0013]
The resin mortar composition of the present invention is not limited to the above components, and any other components may be added. For example, shrinkage-reducing agents (glycol ethers, polyethers, etc.), anti-chilling agents (calcium chloride, etc.), waterproofing agents (stearic acid, etc.), rust inhibitors (phosphates, etc.), viscosity modifiers (methylcellulose, hydroxyethylcellulose) , Polyvinyl alcohol, etc.), setting modifiers (phosphate, etc.), swelling agents (ettringite, lime, etc.), colorants (iron oxide, chromium oxide, etc.), antifoaming agents (silicon, mineral oil, etc.), Reinforcing materials (steel fibers, glass fibers, synthetic fibers, etc.), surfactants (anions, nonions, cationic systems, etc.) and the like.
[0014]
The use of the resin mortar composition of the present invention is not particularly limited. For example, base material adjustment, tile adhesion, rust prevention, waterproof, grout, putty, self-leveling floor, wear-resistant floor, deck covering, elastic mortar, paint, anticorrosion, molded product Etc.
The present invention will be described based on examples. However, the embodiments of the present invention are not limited thereto. In the examples, the number of parts, the mixing ratio, etc. are all shown as solid contents. “Part” means “part by mass” unless otherwise specified.
[0015]
Each characteristic was calculated | required as follows.
(1) Ironing workability test a. Iron workability: After the resin mortar compositions shown in Tables 1 and 3 were prepared, evaluations were made comprehensively such as iron separation and iron elongation. A five-step evaluation was made, and four or more were accepted.
5: Good 3: Somewhat bad 1: Bad b. Blend viscosity change: After preparing the resin mortar compositions shown in Tables 1 and 3, the resin mortar compositions were allowed to stand at 20 ° C., and the stirring time was measured.
Stirable 1 hour or longer was regarded as acceptable.
[0016]
(2) Bending Strength Test After preparing the resin mortar compositions shown in Tables 1 and 3, 10 × 25 × 150 mm specimens were prepared and the bending strength was measured by a three-point bending test.
[0017]
(3) Crack generation state Apply a resin mortar composition shown in Tables 1 and 3 to a concrete flat plate specified in JIS A5304 at a thickness of 2 mm, and check the crack generation state after 1 day (under 20 ° C / 65% RH condition). Observed. Evaluation was performed in five stages based on the following. Three or more were accepted.
5: No cracking occurred 3: Partial cracking occurred 1: Cracking occurred on the entire surface
(4) Adhesion to concrete (normal and water-resistant adhesive strength)
After the samples having cracks of 3 or more were cured in a thermostatic chamber at 20 ° C. and 65% RH for 14 days, the bond strength of the resin mortar composition was measured with a Kenken-type tensile tester (normal bond strength). Furthermore, it was immersed in 20 degreeC water for 24 hours, and the water-resistant strength was measured in the wet state (water-resistant adhesive strength).
1.0 N / mm 2 or more in normal conditions and 0.5 N / mm 2 or more in water resistance were set as acceptable.
[0019]
Examples 1 to 10
The resin mortar composition shown in Table 1 is adjusted with respect to 100 parts by mass of cement. Normal adhesion and water-resistant adhesion strength) were performed. The evaluation results are shown in Table 2.
The raw materials used are as follows.
[0020]
Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.)
Re-emulsified powder resin: VINAPASS RE510Z (ethylene-vinyl acetate system: manufactured by Wacker Chemicals East Asia Co., Ltd.)
VINAPASS LL564 (acrylic: manufactured by Wacker Chemicals East Asia Co., Ltd.)
Formalin condensate of melamine sulfonate: Melment F10M (manufactured by Showa Denko KK)
Formalin condensate of naphthalene sulfonate: Mighty 100 (manufactured by Kao Corporation)
Filling material: Silica sand No. 6 (general commercial product)
Water: Tap water Latex: Polytron A1500 (acryl styrene system: manufactured by Asahi Kasei Kogyo Co., Ltd., solid content 45%)
Methylcellulose: hi Metroles 90SH400 (manufactured by Shin-Etsu Chemical Co., Ltd.)
[0021]
[Comparative Examples 1-5]
The resin mortar composition shown in Table 3 is adjusted with respect to 100 parts by mass of cement, and a troweling workability test (trowel workability, blended product viscosity stability), a bending strength test, crack generation, and adhesion to concrete. (Normal adhesion and water-resistant adhesion strength) were performed in the same manner as in the examples. The evaluation results are shown in Table 4.
Comparative Example 5 is an example using latex. Although there was no problem in terms of performance, the container after using the latex was still a problem by entrusting disposal to a contractor.
[0022]
[Table 1]
[Table 2]
[Table 3]
[Table 4]
【The invention's effect】
By using the cement modifier of the present invention, ironing workability (trowelability, change in viscosity of mortar composition), which has been a problem with conventional resin mortars containing re-emulsified powder resin, and adhesion to underlying concrete Has the effect of greatly improving strength.
Claims (2)
該メラミンスルホン酸塩のホルマリン縮合物と該再乳化形粉末樹脂との質量比率が１／２００〜１／１０であり、
該ナフタレンスルホン酸塩のホルマリン縮合物と該再乳化形粉末樹脂との質量比率が１／１００〜１／１０であり、且つ
該メラミンスルホン酸塩のホルマリン縮合物とナフタレンスルホン酸塩のホルマリン縮合物との質量比率が２／１〜１／４であるセメント改質剤。A re-emulsifying powder resin, a formalin condensate of melamine sulfonate, and a formalin condensate of naphthalene sulfonate,
The mass ratio of the formalin condensate of the melamine sulfonate and the re-emulsified powder resin is 1/200 to 1/10,
The mass ratio of the formalin condensate of the naphthalene sulfonate and the re-emulsifying powder resin is 1/100 to 1/10 , and
A cement modifier having a mass ratio of 2/1 to 1/4 of the formalin condensate of melamine sulfonate and the formalin condensate of naphthalene sulfonate .
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