JPH02283645A - Cement admixture - Google Patents
Cement admixtureInfo
- Publication number
- JPH02283645A JPH02283645A JP10453989A JP10453989A JPH02283645A JP H02283645 A JPH02283645 A JP H02283645A JP 10453989 A JP10453989 A JP 10453989A JP 10453989 A JP10453989 A JP 10453989A JP H02283645 A JPH02283645 A JP H02283645A
- Authority
- JP
- Japan
- Prior art keywords
- water
- cement
- admixture
- dispersion
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004568 cement Substances 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229920005989 resin Polymers 0.000 claims abstract description 27
- 239000011347 resin Substances 0.000 claims abstract description 27
- 239000004815 dispersion polymer Substances 0.000 claims abstract description 18
- 239000006185 dispersion Substances 0.000 claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 30
- 239000004576 sand Substances 0.000 abstract description 10
- 239000000377 silicon dioxide Substances 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 239000007787 solid Substances 0.000 abstract description 7
- 229920001577 copolymer Polymers 0.000 abstract description 5
- 229920000126 latex Polymers 0.000 abstract description 5
- 239000004816 latex Substances 0.000 abstract description 5
- 238000003860 storage Methods 0.000 abstract description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 abstract description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 4
- 239000011398 Portland cement Substances 0.000 abstract description 4
- 229920000609 methyl cellulose Polymers 0.000 abstract description 4
- 239000001923 methylcellulose Substances 0.000 abstract description 4
- 235000010981 methylcellulose Nutrition 0.000 abstract description 4
- 239000002174 Styrene-butadiene Substances 0.000 abstract description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 abstract description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 2
- 229920006173 natural rubber latex Polymers 0.000 abstract description 2
- 229920000058 polyacrylate Polymers 0.000 abstract description 2
- 239000011115 styrene butadiene Substances 0.000 abstract description 2
- 235000010216 calcium carbonate Nutrition 0.000 abstract 1
- 239000004570 mortar (masonry) Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000002250 absorbent Substances 0.000 description 5
- 230000002745 absorbent Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- -1 isobutyne Chemical compound 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 150000002688 maleic acid derivatives Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2676—Polystyrenes
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、貯蔵安定性が極めて良好で、コテ作業性がよ
く、かつ製造が簡単なセメント混和剤に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cement admixture that has extremely good storage stability, good troweling properties, and is easy to manufacture.
従来、土木建築の分野においては、モルタルは一般的に
構造物の内壁や外壁などの表面の化粧、補修、あるいは
タイル張りに使用されている。Conventionally, in the field of civil engineering and construction, mortar is generally used for decorating, repairing, or tiling the surfaces of internal and external walls of structures.
この従来のモルタルの製造は、■作業現場において、骨
材、セメント、セメント混和用ポリマーディスパージョ
ンなどに、必要量の水をそれぞれ測り加えて練り混ぜる
方法が一般的である。The conventional method for manufacturing mortar is as follows: 1. At the work site, the required amount of water is measured and mixed with aggregate, cement, polymer dispersion for mixing with cement, etc.
また、■セメント混和用ポリマーデイスパージョンと、
粉体（セメント、骨材、ＭＣなど）をセットにして現場
に持ち込み、そのセット品を練り混ぜれば、配合が安定
で硬さも同じモルタルを製造することもできる。In addition, ■polymer dispersion for cement mixing,
By bringing a set of powders (cement, aggregate, MC, etc.) to the site and mixing the set, it is possible to produce mortar with a stable composition and the same hardness.
さらに、■必要量の練り混ぜ水またはポリマーディスパ
ージョンを高吸水性樹脂に含水させて得たゲル状化物に
、骨材を配合して得た物質にセメントを練り混ぜてモル
タルを製造することもある。Furthermore, it is also possible to manufacture mortar by mixing the required amount of kneading water or polymer dispersion into a gel-like product obtained by impregnating a super absorbent resin with aggregate, and mixing cement into the material obtained. be.
しかしながら、前記■の方法では、現場で配合する材料
の種類が多く、配合間違いが起こりやすい。However, in the method (2) above, there are many types of materials that are mixed on site, and mixing mistakes are likely to occur.
また、前記■の液粉セットでは、セット品を全量練り混
ぜなければならず、必要のない量まで練ることになり、
材料が無駄となる。また、セット品のため、混練りモル
タルの硬さを変えることが難しい。In addition, with the liquid powder set mentioned above, it is necessary to knead the entire set of products, which results in kneading to an unnecessary amount.
Material is wasted. Also, since it is a set product, it is difficult to change the hardness of the kneaded mortar.
さらに、前記■では、ポリマーディスパージョンのゲル
化物と骨材を混合するには、分散性が悪くて混和剤がう
まく混ざらず、またボリマーデイスパージョンおよび水
と骨材を混合したものは、保存期間中に分離を起こしや
すい、などの欠点を有している。Furthermore, in the case of (2) above, when mixing the gelled product of polymer dispersion and aggregate, the admixture does not mix well due to poor dispersibility, and the mixture of polymer dispersion and water and aggregate does not mix well. It has disadvantages such as easy separation during storage.
本発明は、前記従来技術の課題を背景になされたもので
、貯蔵安定性が極めて良好で、コテ作業性がよく、かつ
製造が簡単なセメント混和剤を提供することを目的とす
る。The present invention was made against the background of the problems of the prior art, and aims to provide a cement admixture that has extremely good storage stability, good workability with a trowel, and is easy to manufacture.
本発明は、セメント混和用ポリマーディスパージョンお
よび水に骨材を分散させた分散液に、吸水性樹脂を添加
して余剰水を吸水させてなるセメント混和剤を提供する
ものである。The present invention provides a cement admixture made by adding a water-absorbing resin to a polymer dispersion for mixing with cement and a dispersion of aggregate dispersed in water to absorb excess water.
本発明で使用されるセメント混和用ポリマーディスパー
ジョンとは、一般の天然あるいは合成高分子の水性分散
液を指称する。このポリマーディスパージョンの具体例
としては、スチレン、スチレン誘導体、マレイン酸、マ
レイン酸誘導体、アクリロニトリル、ブタジェン、クロ
ロプレン、イソプレン、イソブチン、アクリル酸、アク
リル酸エステル、酢酸ビニル、エチレン、塩化ビニリデ
ンなどから選ばれた１種以上の（共）重合体もしくはこ
れ・らと共重合可能な他の単量体との共重合、体の分散
液、または天然ゴムラテックスもしくはエポキシ樹脂エ
マルジョンなどが挙げられる。The polymer dispersion for cement admixture used in the present invention refers to an aqueous dispersion of a general natural or synthetic polymer. Specific examples of this polymer dispersion include styrene, styrene derivatives, maleic acid, maleic acid derivatives, acrylonitrile, butadiene, chloroprene, isoprene, isobutyne, acrylic acid, acrylic esters, vinyl acetate, ethylene, vinylidene chloride, etc. Examples include copolymers of one or more types of (co)polymers or other monomers copolymerizable with these, dispersions of polymers, natural rubber latex, or epoxy resin emulsions.
本発明においては、前記ポリマーディスパージョンのう
ち、スチレン−ブタジェンラテックス、アクリル酸およ
びそのエステルあるいはメタクリル酸およびそのエステ
ルを共重合した（メタ）アクリルエマルジョン、エチレ
ン−酢酸ビニル共重合体エマルジョンが好ましい。特に
、ポリマーディスパージョンの重合時における電解質を
減少させたものが好ましい。In the present invention, among the polymer dispersions described above, styrene-butadiene latex, (meth)acrylic emulsion copolymerized with acrylic acid and its ester or methacrylic acid and its ester, and ethylene-vinyl acetate copolymer emulsion are preferred. Particularly preferred is a polymer dispersion in which the amount of electrolyte during polymerization is reduced.
このポリマーディスパージョンのポリマーの混和剤中の
割合は、使用するポルトランドセメント１００重量部に
対して、１〜５００重量部、好ましくは３〜３００重量
部であり、１重量部未満ではセメントと混練りしたとき
、ポリマー量が少なくてセメント改質材としての効果が
です、一方５００重量部を超えるとセメントの強度がで
ない。The proportion of the polymer in this polymer dispersion in the admixture is 1 to 500 parts by weight, preferably 3 to 300 parts by weight, per 100 parts by weight of Portland cement used, and if it is less than 1 part by weight, it will not mix with the cement. When the amount of polymer is small, it is effective as a cement modifier, but on the other hand, if it exceeds 500 parts by weight, the strength of the cement is lost.
また、水は、混和剤の最終固形分が目的の値となるよう
に必要量添加する。すなわち、水の添加量は、混和剤の
最終固形分が３０〜８５重量％、好ましくは４０〜８０
重量％、さらに好ましくは５０〜７５重量％になるよう
に添加するのがよく、最終固形分が３０重量％未満では
吸水性樹脂の添加量が多くなり得られる混和・剤をセメ
ントに加えてもモルタルにしたときの物性が低下し、一
方８５重量％を超えると得られる混和剤をセメントと混
練りする場合、水分が不足し練りにくくなり、モルタル
物性も所定の強度がでないことになる。Further, water is added in a necessary amount so that the final solid content of the admixture becomes the desired value. That is, the amount of water added is such that the final solid content of the admixture is 30 to 85% by weight, preferably 40 to 80% by weight.
It is best to add the water-absorbing resin in an amount of 50 to 75% by weight, and if the final solid content is less than 30% by weight, the amount of water-absorbing resin added will be large, even if the resulting admixture/agent is added to the cement. When made into mortar, the physical properties deteriorate. On the other hand, when the resulting admixture exceeds 85% by weight, it becomes difficult to knead due to lack of moisture, and the mortar physical properties do not have the required strength.
さらに、骨材としては、炭酸カルシウム、クレー、タル
ク、石粉、珪砂などのほか、パーライトなどの軽°量骨
材、アスベスト、カーボンファイバー、ポリエステルフ
ァイバー、アラミドファイバーなどを挙げることができ
、これらの骨材の１種または２種以上を併用することが
できる。骨材としては、好ましくは石粉、珪砂である。In addition, examples of aggregates include calcium carbonate, clay, talc, stone powder, silica sand, etc., as well as lightweight aggregates such as perlite, asbestos, carbon fiber, polyester fiber, aramid fiber, etc. One type or a combination of two or more types of materials can be used. Preferably, the aggregate is stone powder or silica sand.
この骨材の使用量は、使用するポルトランドセメント１
００重量部に対して、１０〜４００重量部、好ましくは
４０〜３００重量部であり、１０重量部未満ではセメン
トと混練りしたとき、セメントの分散があまりよ（なく
、一方４００重量部を超えるとポリマーモルタルとして
の性能に影響がでてくる。The amount of this aggregate used is 1
00 parts by weight, 10 to 400 parts by weight, preferably 40 to 300 parts by weight; if it is less than 10 parts by weight, the dispersion of cement will not be very good when kneaded with cement; on the other hand, if it exceeds 400 parts by weight, This will affect the performance of the polymer mortar.
本発明は、このようにしてセメント混和用ポリマーディ
スパージョンおよび水に骨材を分散させた得られた分散
液に、吸水性樹脂を添加して余剰水を吸水させることを
特徴とする。The present invention is characterized in that a water-absorbing resin is added to the polymer dispersion for mixing cement and the dispersion obtained by dispersing aggregate in water to absorb excess water.
ここで、吸水性樹脂としては、ポリアクリル酸塩、酢酸
ビニル−アクリル酸塩共重合体、イソブチレン−無水マ
レイン酸共重合体、ポリエチレンオキサイド変性物、デ
ンプンまたは多糖類に（メタ）アクリル酸、、そのエス
テル塩もしくはアクリロニトリルをグラフト共重合した
架橋物、カルボキシメチルセルロース架橋物などが挙げ
られる。Here, as the water-absorbing resin, polyacrylate, vinyl acetate-acrylate copolymer, isobutylene-maleic anhydride copolymer, polyethylene oxide modified product, starch or polysaccharide, (meth)acrylic acid, Examples thereof include ester salts thereof, crosslinked products obtained by graft copolymerizing acrylonitrile, and carboxymethylcellulose crosslinked products.
これらの吸水性樹脂は、１種単独であるいは２種以上を
併用することができる。These water-absorbing resins can be used alone or in combination of two or more.
これらの吸水性樹脂の吸水倍率は、純水で２０〜１ ０
００ｇ／ｇであるが、使用する単独または混合した吸水
性樹脂の吸水倍率は、純水で５０〜ｌ、０００ｇ／ｇ、
好ましくは１００〜１．０００ｇ／ｇ、さらに好ましく
は２００〜１．０００ｇ／ｇとなるものがよい。The water absorption capacity of these water-absorbing resins is 20 to 10 in pure water.
00g/g, but the water absorption capacity of the water-absorbing resin used alone or in combination is 50-1 in pure water, 000g/g,
Preferably it is 100 to 1.000 g/g, more preferably 200 to 1.000 g/g.
この吸水性樹脂は、電解質があると吸水倍率が落ちるた
め、前記吸水倍率が５０ｇ／ｇ未満では混和剤中の電解
質の影響で吸水能力が低くなりすぎて混和剤の静置安定
性が悪くなる場合がある。The water absorption capacity of this water-absorbing resin decreases if there is an electrolyte, so if the water absorption capacity is less than 50 g/g, the water absorption capacity will be too low due to the influence of the electrolyte in the admixture, and the static stability of the admixture will deteriorate. There are cases.
吸水性樹脂の添加量は、混和剤中の水分１００□重量部
に対して、０．１〜２０重量部、好ましくは０． ２〜
１０重量部であり、０．１重量部未満では水分の吸水能
力が小さく、得られる混和剤が分離し、一方２０重量部
を超えるとセメントと混和したとき吸水性樹脂中に残る
水分が多くなり、混練りしにくくなったり、水／セメン
ト比が大きくなるため、モルタル物性に影響がでる。The amount of water absorbent resin added is 0.1 to 20 parts by weight, preferably 0.1 to 20 parts by weight, per 100 parts by weight of water in the admixture. 2~
If the amount is less than 0.1 part by weight, the water absorption capacity will be small and the resulting admixture will separate, while if it exceeds 20 parts by weight, a large amount of water will remain in the water absorbent resin when mixed with cement. , it becomes difficult to knead, and the water/cement ratio increases, which affects the physical properties of the mortar.
本発明では、この吸水性樹脂を前記分散液（セメント混
和用ポリマーディスパージョンおよび水＋骨材）に添加
し、かくて余剰水をこの吸水性樹脂に吸水させることが
必要である。In the present invention, it is necessary to add this water-absorbing resin to the dispersion liquid (polymer dispersion for cement mixing and water + aggregate), and thus make the excess water absorbed by this water-absorbing resin.
吸水性樹脂の添加は、樹脂粉末単独あるいは添加水の一
部を吸水性樹脂に吸水させたものを添加してもよい。The water-absorbing resin may be added as a resin powder alone or as a result of the water-absorbing resin absorbing a portion of the added water.
例えば、ポリマーディスパージョンにまず吸水性樹脂混
合してゲル化物を作製し、次いでこのゲル化物に骨材を
配合しても、このポリマーディスパージョンのゲル化物
と骨材との分散性が悪くて均一に分散させるには、プラ
ネタリ−ミキサーのような特殊な高粘度設備が必要とな
る。For example, even if a polymer dispersion is first mixed with a water-absorbing resin to create a gelled product, and then aggregate is added to this gelled product, the dispersibility between the gelled product and the aggregate in the polymer dispersion is poor, resulting in a uniform Dispersion requires special high-viscosity equipment such as a planetary mixer.
なお、本発明により得られる混和剤中には、さらに必要
に応じて公知に充填剤、分散剤、消泡剤、架橋剤、増粘
剤、発泡剤、着色剤、難燃剤、防腐剤、耐水化剤、老化
防止剤、安定剤、加硫促進剤、帯電防止剤、ｐＨ調整剤
、保水剤などを配合することもできる。本発明において
、これらの配合剤は、吸水性樹脂を加える前に添加する
ことが好ましい。In addition, the admixture obtained by the present invention may further contain known fillers, dispersants, antifoaming agents, crosslinking agents, thickeners, foaming agents, coloring agents, flame retardants, preservatives, and waterproofing agents, if necessary. A curing agent, an anti-aging agent, a stabilizer, a vulcanization accelerator, an antistatic agent, a pH adjuster, a water retaining agent, etc. can also be blended. In the present invention, these compounding agents are preferably added before adding the water absorbent resin.
以下、実施例を挙げ、本発明をさらに具体的に説明する
。EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples.
実施例１
ポリマーディスパージョンとして、スチレン−ブタジェ
ン共重合体ラテックス（日本合成ゴム■製、ＪＳＲＯ５
８８、固形分濃度５０重量％）を固形分換算で１００重
量部に対し、水５００重量部、珪砂６号を６００重量部
、メチルセルロース（日本合成化学■製、ハイメトロー
ズ９０ＳＨ４０００）５重量部を加えて攪拌して分散液
となした。Example 1 Styrene-butadiene copolymer latex (manufactured by Japan Synthetic Rubber, JSRO5) was used as a polymer dispersion.
88, solid content concentration 50% by weight) to 100 parts by weight in terms of solid content, 500 parts by weight of water, 600 parts by weight of silica sand No. 6, and 5 parts by weight of methyl cellulose (manufactured by Nippon Gosei Kagaku ■, Hymetrose 90SH4000) were added. The mixture was stirred to form a dispersion.
この分散液に、吸水性樹脂としてポリアクリル酸ソーダ
塩（製鉄化学■製、アクアキープ１Ｏ３Ｈ）５重量部を
加えて２分３０秒間攪拌した。To this dispersion, 5 parts by weight of polyacrylic acid sodium salt (Aqua Keep 1O3H, manufactured by Tetsutsu Kagaku ■) was added as a water absorbent resin, and the mixture was stirred for 2 minutes and 30 seconds.
このようにして得られたセメント混和剤を１昼夜静置し
ても、珪砂は沈澱しておらず固液の分離は起こらなかっ
た。Even when the cement admixture thus obtained was allowed to stand for a day and night, silica sand did not precipitate and solid-liquid separation did not occur.
また、ここで作製したコンパウンドの上部５００重量部
と下部の５００重量部に各々ポルトランドセメント６３
０重量部を加えて、ＪＩＳＲ５２０１に準じてフロー値
を測定した。In addition, 500 parts by weight of the upper part and 500 parts by weight of the lower part of the compound prepared here were each added with Portland cement 63.
0 parts by weight was added, and the flow value was measured according to JISR5201.
その結果、上部のフロー値は１６０、下部のフロー値は
１６１であった。As a result, the upper flow value was 160, and the lower flow value was 161.
比較例１
実施例１に使用したスチレン−ブタジェン共重合体ラテ
ックスを固形分換算で１００重量部に対し、水５００重
量部、珪砂６号を６００重量部、メチルセルロース５部
を加えて、撹拌後静置したが２４時間後、珪砂が沈降し
、固液分離した。Comparative Example 1 To 100 parts by weight of the styrene-butadiene copolymer latex used in Example 1 in terms of solid content, 500 parts by weight of water, 600 parts by weight of silica sand No. 6, and 5 parts of methylcellulose were added, and after stirring, the mixture was allowed to stand still. However, after 24 hours, the silica sand settled and solid-liquid separation occurred.
比較例２
実施例１において、混和順序を変える以外は、実施例１
と同様にして実験した。Comparative Example 2 Same as Example 1 except for changing the mixing order.
I conducted an experiment in the same way.
すなわち、まずスチレン−ブタジェン共重合体ラテック
ス、水、メチルセルロースおよび吸水性樹脂を混合して
ゲル化物を作製し、次いでこれに骨材である珪砂を加え
て２分３０秒攪拌した。That is, first, a styrene-butadiene copolymer latex, water, methyl cellulose, and a water-absorbing resin were mixed to prepare a gelled product, and then silica sand as an aggregate was added thereto and stirred for 2 minutes and 30 seconds.
このコンパウンドの上部５００重量部と下部の５００重
量部に各々ポルトランドセメント６３０重量部を加えて
、ＪＩＳ Ｒ５２０１に準じてフロー値を測定した。630 parts by weight of Portland cement was added to 500 parts by weight of the upper part and 500 parts by weight of the lower part of this compound, and the flow value was measured according to JIS R5201.
その結果、上部のフロー値は１３３、下部のフロー値は
１６３であった。すなわち、珪砂の分散不良がみられた
。As a result, the upper flow value was 133, and the lower flow value was 163. In other words, poor dispersion of silica sand was observed.
（発明の効果〕
本発明の混和剤は、珪砂のように粗い骨材を混和剤に使
用しても、保存安定性がよく、長期間放置しておいても
固液の分離がない。(Effects of the Invention) The admixture of the present invention has good storage stability even when a coarse aggregate such as silica sand is used as an admixture, and there is no solid-liquid separation even if left for a long period of time.
また、本発明の混和剤とセメントを混ぜると、吸水性樹
脂はセメントの強アルカリおよび電解質によって吸収倍
率が小さくなり、水を放出するため練りやすく施工現場
でセメントと混和剤を練り混ぜて適当な硬さになるよう
にするだけでもモルタルとして使用でき、モルタル製造
する際、水や骨材を加える必要がない。さらに、製造時
に吸水性樹脂を最後に添加するため、吸水性樹脂を添加
するまでの混和剤の粘度が低く、骨材その他の添加剤の
分散性がよく、高粘度設備のような特殊な機械を使用し
なくても製造することができる。In addition, when the admixture of the present invention is mixed with cement, the water-absorbing resin has a small absorption capacity due to the strong alkali and electrolyte of the cement, and releases water, making it easy to mix and mix the cement and admixture at the construction site. It can be used as mortar just by making it hard, and there is no need to add water or aggregate when making mortar. Furthermore, since the water-absorbing resin is added last during manufacturing, the viscosity of the admixture is low until the water-absorbing resin is added, and the dispersibility of aggregate and other additives is good. It can be manufactured without using.
Claims (1)
水に骨材を分散させた分散液に、吸水性樹脂を添加して
余剰水を吸水させてなるセメント混和剤。(1) A cement admixture made by adding a water-absorbing resin to a polymer dispersion for mixing with cement and a dispersion of aggregate dispersed in water to absorb excess water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10453989A JPH02283645A (en) | 1989-04-26 | 1989-04-26 | Cement admixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10453989A JPH02283645A (en) | 1989-04-26 | 1989-04-26 | Cement admixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02283645A true JPH02283645A (en) | 1990-11-21 |
Family
ID=14383300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10453989A Pending JPH02283645A (en) | 1989-04-26 | 1989-04-26 | Cement admixture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02283645A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020038211A (en) * | 2000-11-17 | 2002-05-23 | 강종구 | preparation material with hardenability |
| JP2005089288A (en) * | 2003-08-11 | 2005-04-07 | Nanba Kenchiku Kenkyushitsu:Kk | Gel composition for mortar, plastering material production kit using the same, and mortar |
| US8491969B2 (en) | 2008-06-27 | 2013-07-23 | Akzo Nobel N.V. | Redispersible polymer powder |
| US8623462B2 (en) | 2008-06-27 | 2014-01-07 | Akzo Nobel N.V. | Redispersible polymer powder composition |
| CN111484282A (en) * | 2020-03-13 | 2020-08-04 | 上海练定新材料科技有限公司 | High-flow-state anti-crack concrete and preparation method thereof |
-
1989
- 1989-04-26 JP JP10453989A patent/JPH02283645A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020038211A (en) * | 2000-11-17 | 2002-05-23 | 강종구 | preparation material with hardenability |
| JP2005089288A (en) * | 2003-08-11 | 2005-04-07 | Nanba Kenchiku Kenkyushitsu:Kk | Gel composition for mortar, plastering material production kit using the same, and mortar |
| US8491969B2 (en) | 2008-06-27 | 2013-07-23 | Akzo Nobel N.V. | Redispersible polymer powder |
| US8623462B2 (en) | 2008-06-27 | 2014-01-07 | Akzo Nobel N.V. | Redispersible polymer powder composition |
| CN111484282A (en) * | 2020-03-13 | 2020-08-04 | 上海练定新材料科技有限公司 | High-flow-state anti-crack concrete and preparation method thereof |
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