JP2012077205A - Water-swelling friction reducing composition - Google Patents
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本発明は、水膨潤性摩擦低減組成物に関する。更に詳しくは、基礎杭等に作用する摩擦力の軽減、地中に設置した仮設山留壁のＨ鋼、鋼矢板等の鋼材を工事終了後に撤去・回収する際の引抜きを容易にするための引抜き材、更には、仮設土留工として敷設されたＨ鋼、鋼矢板等の鋼材への土砂の付着防止用途として使用することができる水膨潤性摩擦低減組成物に関する。 The present invention relates to a water-swellable friction reducing composition. More specifically, to reduce the frictional force acting on foundation piles, etc., and to facilitate removal when removing and collecting steel materials such as H steel and steel sheet piles of temporary mountain retaining walls installed underground The present invention also relates to a water-swellable friction reducing composition that can be used for the purpose of preventing the adhesion of earth and sand to steel materials such as H steel and steel sheet piles laid as a temporary earth retaining work.
一般に土木工事の基礎構造物の工事において、軟弱地盤に埋設された基礎杭等の基礎構造物が地盤変動により沈下または隆起を引き起こし、基礎杭に支持される構築物に変形・破壊などの大きな影響を及ぼす。この様な現象を防止する対策として水膨潤性摩擦低減組成物を予め基礎杭等に塗布し、この組成物が水と接触して膨潤して潤滑層を形成することにより、基礎杭の沈下を防ぐ方法が知られている。
例えば、特許文献１（特開昭６３−２７６１９号公報）には、ポリビニルブチラールを主体とする吸水性樹脂と製膜性を有する微粉末（ゼラチンまたは寒天）からなる水膨潤性組成物を基礎構造物の表面に塗布して地盤との摩擦力を軽減する設置工法が、特許文献２（特開平４−１２２７８１号公報）には、熱可塑性エラストマーと界面活性剤を含有してなる水膨潤性摩擦低減組成物がそれぞれ開示されている。
また、セメント系固結材中に埋設した杭等の仮設材を回収するために仮設材の表面に水膨潤性摩擦低減組成物を塗布する方法が採られており、特許文献３（特開昭６３−３１２４２１号公報）には、油中水型水膨潤性重合体粒子エマルジョンにより周面摩擦抵抗を低減することが、特許文献４（特開昭６３−１６５６１５号公報）には、揮発性膜形成樹脂と高吸水性樹脂を塗布して膜を形成し、高吸水性樹脂を水で膨潤させる摩擦抵抗力低減方法が、特許文献５（特開昭６４−５８７５１号公報）には、吸水性ポリマーと有機樹脂の割合を２０〜３０：７０〜８０の比率の水膨潤性処理材が、特許文献６（特開平７−２４７５４９号公報）には、吸水性ポリマーが基材に直接固着した吸水性ポリマーシート層を設けた仮埋設物引抜き用潤滑材が、特許文献７（特開平１１−２４１３３９号公報）には、水膨潤性樹脂と酸価が１５ｍｇＫＯＨ／ｇ以下であるアルカリ水溶性樹脂とを含む処理材が、特許文献８（特開２００１−２２６９７９号公報）には、引抜き等を容易にするために、保護層、潤滑剤層で構成された摩擦構造体が開示されている。
なお、鋼材への土砂付着の低減を目的とした水膨潤性摩擦低減材が、特許文献９（特開２００２−６０６９４号公報）、特許文献１０（特開２００２−３２７４４８号公報）に開示されている。
Generally, in the construction of civil engineering foundation structures, foundation structures such as foundation piles buried in soft ground cause subsidence or uplift due to ground fluctuations, and the structures supported by foundation piles have a large impact such as deformation and destruction. Effect. As a measure to prevent such a phenomenon, a water swellable friction reducing composition is applied in advance to a foundation pile, etc., and this composition swells in contact with water to form a lubricating layer, thereby reducing the foundation pile settlement. How to prevent is known.
For example, Patent Document 1 (Japanese Patent Laid-Open No. 63-27619) discloses a water-swellable composition comprising a water-absorbing resin mainly composed of polyvinyl butyral and a fine powder (gelatin or agar) having film-forming properties as a basic structure. Patent Document 2 (Japanese Patent Laid-Open No. 4-122781) discloses an installation method for reducing the frictional force with the ground by applying to the surface of an object, and a water-swellable friction comprising a thermoplastic elastomer and a surfactant. Each reduction composition is disclosed.
Further, a method of applying a water-swellable friction reducing composition to the surface of the temporary material has been adopted in order to recover a temporary material such as a pile embedded in the cement-based consolidated material. No. 63-31421) describes that the frictional resistance of the peripheral surface is reduced by a water-in-oil type water-swellable polymer particle emulsion, and Japanese Patent Application Laid-Open No. 63-165615 discloses a volatile film. A method for reducing frictional resistance by applying a forming resin and a superabsorbent resin to form a film and swelling the superabsorbent resin with water is disclosed in Patent Document 5 (Japanese Patent Application Laid-Open No. 64-58751). A water-swellable treatment material having a polymer / organic resin ratio of 20 to 30:70 to 80 is disclosed in Patent Document 6 (Japanese Patent Laid-Open No. 7-247549) in which water-absorbing polymer is directly fixed to a substrate. Lubricant for pulling out temporarily buried objects with a conductive polymer sheet layer JP-A-11-241339 discloses a treatment material containing a water-swellable resin and an alkaline water-soluble resin having an acid value of 15 mgKOH / g or less. Discloses a friction structure composed of a protective layer and a lubricant layer in order to facilitate drawing and the like.
Note that water-swellable friction reducing materials aimed at reducing sediment adhesion to steel materials are disclosed in Patent Document 9 (Japanese Patent Laid-Open No. 2002-60694) and Patent Document 10 (Japanese Patent Laid-Open No. 2002-327448). Yes.
コンクリート杭、鋼材等に水膨潤性摩擦低減塗料を塗布することにより地盤沈下等によるこれらの基礎杭の沈下変動防止、セメントなどの固着材層に埋設された杭等を回収する場合に引抜きを容易に、土留め壁等で工事後に引抜き回収される鋼材の引抜きを容易にすると共に、鋼材への土付着防止でそれぞれ効果を上げている。
しかし、近年、水膨潤性摩擦低減組成物に要求される機能が多様化している。例えば仮設工事において、杭を打設し、工事が終了後にその杭を引抜くことが多く行われている。この様な仮設工事においては、引抜き力を小さくして引抜きを容易にするために予め杭に水膨潤性摩擦低減塗料を塗布してから杭を打ち込む方法が採られている。
Applying water-swellable friction reducing paint to concrete piles, steel materials, etc. to prevent subsidence fluctuations of these foundation piles due to ground subsidence, etc., easy to pull out when collecting piles embedded in cement and other fixed material layers In addition, it is easy to pull out the steel material that is pulled out and collected after the construction with a retaining wall or the like, and also has an effect in preventing soil adhesion to the steel material.
In recent years, however, the functions required of water-swellable friction reducing compositions have been diversified. For example, in temporary construction, a pile is often driven and the pile is pulled out after the construction is completed. In such temporary construction, a method of driving the pile after applying a water-swellable friction-reducing paint in advance to the pile is adopted in order to reduce the drawing force and facilitate drawing.
しかし、仮設工事施工方法によっては、杭をｐＨが中性の掘削安定液中に建て込み、一昼夜おいてからソイルセメントで置換して固める方法が採られることがある。これまでの水膨潤性摩擦低減塗料では、安定液中で膨潤が進行するため膨潤膜と杭との付着強度が弱くなり、ソイルセメントをポンプで強力に送り込んで置換すると、杭から水膨潤性摩擦低減塗料の膨潤膜が剥れ落ちて、摩擦低減塗料を塗布した効果が失われてしまう。
この様な施工方法に耐えうる水膨潤性摩擦低減塗料としてｐHが中性の掘削安定液中では膨潤せず、セメントコンクリート等のアルカリ液中で膨潤するタイプの水膨潤性摩擦低減組成物が要求される場合がある。
本発明は、水膨潤性摩擦低減組成物の摩擦低減特性を低下させることなく、ｐＨが中性の水中では膨潤せず、アルカリ領域で膨潤することを課題とするものである。
However, depending on the temporary construction method, a method may be employed in which the pile is built in the excavation stabilizing solution having a neutral pH, and is replaced with soil cement after a day and night. With conventional water-swellable friction reducing paints, swelling progresses in a stable liquid, so the adhesion strength between the swelling film and the pile is weakened. The swelling film of the reduced paint peels off, and the effect of applying the friction reducing paint is lost.
A water-swellable friction-reducing composition of the type that does not swell in excavation stable liquid with neutral pH and swells in alkaline liquid such as cement concrete as a water-swellable friction-reducing paint that can withstand such construction methods. May be.
An object of the present invention is to swell in an alkaline region without reducing the friction-reducing properties of the water-swellable friction-reducing composition and without swelling in neutral water.
カルボキシメチルセルロースアルミニウム、カルボキシメチルセルロースカルシウム等の高吸水性ポリマーである特殊ＣＭＣを使用することにより、アルカリ領域において中性の場合に比較して大きな膨潤率が得られることを見出したことに基づくものであり、少なくとも熱可塑性エラストマーと前記のカルボキシメチルセルロースアルミニウム（ＣＭＣ−Ａｌ）、カルボキシメチルセルロースカルシウム（ＣＭＣ−Ｃａ）、カルボキシメチルセルロース（ＣＭＣ−Ｈ）のいずれかを含む水膨潤性摩擦低減組成物である。 It is based on the finding that by using special CMC, which is a highly water-absorbing polymer such as carboxymethylcellulose aluminum and carboxymethylcellulose calcium, a large swelling rate can be obtained in the alkaline region compared to the neutral case. The water-swellable friction-reducing composition comprising at least a thermoplastic elastomer and any one of the carboxymethylcellulose aluminum (CMC-Al), carboxymethylcellulose calcium (CMC-Ca), and carboxymethylcellulose (CMC-H).
本発明に使用する熱可塑剤性エラストマーは、溶剤（トルエン、キシレン、アセトン等）に容易に溶解することが必要である。これは、エラストマー溶液に本発明の他の成分を均一に分散させ、また鋼矢板、Ｈ鋼等の鋼材、及びコンクリ−ト杭等への塗布作業を容易にするためである。
この性能を有するものとして酢酸ビニル樹脂、エチレン酢酸ビニル共重合樹脂、クロロプレンゴム、アクリル酸エステル共重合体樹脂、ウレタン系樹脂、スチレン−ブタジエン樹脂、エチレン・エチルアクリレート共重合樹脂、非晶性ポリエステル樹脂等である。また、膜状（シート状）または帯状に成型加工する場合には、比較的柔軟性のあるエチレン酢酸ビニル共重合樹脂、クロロプレンゴム等の少なくとも一種が好適である。
なお、エチレン酢酸ビニル共重合樹脂は、酢酸ビニル含有量（ＶＡ量）特性４０％以上が好ましい。４０％以下になると溶剤への溶解が悪くなり、樹脂溶解作業が困難となる。
The thermoplastic elastomer used in the present invention needs to be easily dissolved in a solvent (toluene, xylene, acetone, etc.). This is because the other components of the present invention are uniformly dispersed in the elastomer solution, and the application work to steel sheets such as steel sheet piles, H steel, and concrete piles is facilitated.
As those having this performance, vinyl acetate resin, ethylene vinyl acetate copolymer resin, chloroprene rubber, acrylate copolymer resin, urethane resin, styrene-butadiene resin, ethylene / ethyl acrylate copolymer resin, amorphous polyester resin Etc. In the case of molding into a film (sheet) or strip, at least one of a relatively flexible ethylene vinyl acetate copolymer resin, chloroprene rubber and the like is preferable.
The ethylene vinyl acetate copolymer resin preferably has a vinyl acetate content (VA amount) characteristic of 40% or more. If it is 40% or less, the dissolution in the solvent becomes worse and the resin dissolving operation becomes difficult.
高吸水性ポリマーは、淡水でほとんど膨潤せず、アルカリ液中で膨潤するものであり、カルボキシメチルセルロースカルシウム（ＣＭＣ−Ｃａ）、カルボキシメチルセルロースアルミニウム（ＣＭＣ−Ａｌ）、カルボキシメチルセルロース（ＣＭＣ−Ｈ）が好適である。
ここで、一般的にカルボキシメチルセルロース（ＣＭＣ）と呼ばれているのは、末端をナトリウムで置換したカルボキシメチルセルロースナトリウム（ＣＭＣ−Ｎａ）であり、多くの種類があり、種々の用途で広く用いられている。
そして、末端のナトリウムを他の陽イオン、例えば、カルシウム、アルミニウムを導入したＣＭＣは、カルボキシメチルセルロースアルミニウム（ＣＭＣ−Ａｌ）、カルボキシメチルセルロースカルシウム（ＣＭＣ−Ｃａ）と呼ばれカルボキシメチルセルロースナトリウム（ＣＭＣ−Ｎａ）と異なった特性を持っている。また、セルロースにカルボキシメチル基（−ＣＨ2ＣＯＯＨ）を導入したものはＣＭＣ酸（ＣＭＣ−Ｈ）と呼ばれ、これもカルボキシメチルセルロースナトリウムと異なった特性を有しており、これらは日本薬局方では特殊ＣＭＣに分類されて一般的なカルボキシメチルセルロースナトリウム（ＣＭＣ−Ｎａ）とは区別されている。
The superabsorbent polymer hardly swells in fresh water and swells in an alkaline solution, and carboxymethylcellulose calcium (CMC-Ca), carboxymethylcellulose aluminum (CMC-Al), and carboxymethylcellulose (CMC-H) are suitable. It is.
Here, what is generally called carboxymethyl cellulose (CMC) is sodium carboxymethyl cellulose (CMC-Na) having a terminal substituted with sodium, and there are many types, which are widely used in various applications. Yes.
And CMC which introduce | transduced other cation, for example, calcium and aluminum, into the terminal sodium is called carboxymethylcellulose aluminum (CMC-Al) and carboxymethylcellulose calcium (CMC-Ca), and carboxymethylcellulose sodium (CMC-Na) And have different characteristics. Further, those introduced carboxymethyl groups (-CH 2 COOH) cellulose is called CMC acid (CMC-H), which also has different characteristics and sodium carboxymethylcellulose, which are the Japanese Pharmacopoeia It is classified as a special CMC and distinguished from general sodium carboxymethyl cellulose (CMC-Na).
これら特殊ＣＭＣを使用した本発明の水膨潤性摩擦低減組成物で形成される塗膜は、淡水中では１〜３倍前後の膨潤率であるが、例えば、ｐＨが１４のアルカリ液中では１０〜２０倍の膨潤率を示す。
これらの特殊ＣＭＣを使用した場合、実用的に満足できる膨潤率を得るには浸漬水のｐＨは１１以上とするのが好ましい。
The coating film formed from the water-swellable friction reducing composition of the present invention using these special CMCs has a swelling ratio of about 1 to 3 times in fresh water, but for example, 10 in an alkaline solution having a pH of 14. Swell ratio of ~ 20 times is shown.
When these special CMCs are used, the pH of the immersion water is preferably 11 or more in order to obtain a practically satisfactory swelling rate.
有機溶剤は、熱可塑剤性エラストマーを溶解するためのもので、キシレン、トルエン等の芳香族炭化水素、アセトン、ＭＥＫ（メチル・エチルケトン）、シクロヘキサン類等の少なくとも一種である。 The organic solvent is for dissolving the thermoplastic elastomer and is at least one of aromatic hydrocarbons such as xylene and toluene, acetone, MEK (methyl ethyl ketone), and cyclohexanes.
その他添加物質として、充填材、着色顔料等を加えることが可能である。充填材は塗布乾燥膜の強度を得ることが主目的で、無機の充填材はアルミナ、シリカ系の微粉末、ベントナイト等の天然にある粘土性鉱物粉末等を使用することができる。 As other additive substances, fillers, coloring pigments, and the like can be added. The main purpose of the filler is to obtain the strength of the coated and dried film, and the inorganic filler may be natural clay mineral powder such as alumina, silica-based fine powder, bentonite, or the like.
着色顔料は組成物の着色を目的に添加し、例えばベンガラ、チタン白、カーボンブラック等を加えて使用することができる。
水膨潤性摩擦低減組成物の粘度を調整する目的で微粒子シリカ等を加えることも可能である。
The coloring pigment is added for the purpose of coloring the composition, and for example, Bengala, titanium white, carbon black and the like can be added and used.
For the purpose of adjusting the viscosity of the water-swellable friction reducing composition, it is possible to add fine particle silica or the like.
本発明の水膨潤性摩擦低減組成物は、上記の各成分を混合してディゾルバー等を用いて撹拌し、十分に分散させて均一化する。得られた水膨潤性組成物を鋼材、あるいは、コンクリート杭等に刷毛、スプレー等で塗布することによって基礎杭の負摩擦低減用途、仮設材の引抜き、押し込み用途、更には、Ｈ鋼、鋼矢板への土砂付着防止用途として使用される。 In the water-swellable friction reducing composition of the present invention, the above-described components are mixed, stirred using a dissolver or the like, and sufficiently dispersed and homogenized. Applying the obtained water-swellable composition to steel or concrete piles with brush, spray, etc., to reduce negative friction of foundation piles, to pull out and push in temporary materials, and further to H steel, steel sheet piles Used as an anti-sediment application.
そして、鋼材の錆の発生を防止することを目的に防錆剤を添加することも可能である。添加することで、鋼材の寿命向上に繋がる。防錆剤はジノニルナフタレンスルホン酸の金属塩、アニオン系特殊アミン系等が効果的である。
本発明の水膨潤性組成物は容易にシート状に加工成型することができ、このシート成型品の裏面に接着層を設けることによって鋼材等に貼り付けて使用することができる。シート成型品は、塗布する方法に比較して乾燥時間が不要であり、塗布するタイプに比較して工事作業の効率向上が図られる。
And it is also possible to add a rust preventive agent for the purpose of preventing generation | occurrence | production of the rust of steel materials. By adding, it leads to the life improvement of steel materials. As the rust inhibitor, metal salts of dinonylnaphthalene sulfonic acid, anionic special amines, and the like are effective.
The water-swellable composition of the present invention can be easily processed and formed into a sheet shape, and can be used by being attached to a steel material or the like by providing an adhesive layer on the back surface of the sheet molded product. Sheet molded products do not require drying time compared to the method of coating, and the efficiency of construction work can be improved compared to the type of coating.
本発明の水膨潤性摩擦低減組成物によって摩擦低減特性を低下させることなく、中性領域での膨潤が抑制され、アルカリ領域で大きく膨潤するので、水膨潤性摩擦低減組成物の膨潤の時期を制御することができ、施工中に必要に応じて膨潤を開始させることができる。 The water-swellable friction-reducing composition of the present invention suppresses the friction-reducing properties and suppresses swelling in the neutral region and swells greatly in the alkaline region. It can be controlled and can start to swell as needed during construction.
以下に、本発明の実施例を示す。本発明はこれらの実施例のみに限定されるものではない。なお、以下の記載において、配合は重量部で示す。
実施例の水膨潤性摩擦低減組成物について膨潤率、引抜き試験を実施した。その結果を表１に示す。
Examples of the present invention are shown below. The present invention is not limited to these examples. In addition, in the following description, a mixing | blending is shown by a weight part.
The water swellable friction reducing compositions of the examples were subjected to a swelling rate and a pull-out test. The results are shown in Table 1.
膨潤率試験は、水膨潤性摩擦低減組成物をクッキングシート上に１ｍｍの厚さに塗布し、乾燥後にクッキングシートから乾燥塗膜を剥がし、２×２ｃｍ□に裁断し、この裁断試料片を淡水（ｐH７）の入った水槽に入れ浸漬・膨潤させた。浸漬前後の重量変化から次のようにして膨潤率を求めた。
膨潤率＝浸漬後の試料の重量／浸漬前の試料の重量
引抜き試験は、水膨潤性摩擦低減組成物を鉄製のフラットバー（２００×７５×３ｍｍ）に膜厚１ｍｍ程度に塗布し、乾燥後に１Ｌの容器（丸缶）に挿入し、この容器にセメントモルタルを注入して固化させ、一ケ月後に島津製作所製の５０ｋＮのオートグラフにて引抜きを行い、引抜き力を求めた。
In the swelling rate test, a water-swellable friction reducing composition was applied to a cooking sheet to a thickness of 1 mm, dried, the dried coating film was peeled off from the cooking sheet, and cut into 2 × 2 cm □, and this cut specimen was treated with fresh water. It was immersed in and swollen in a water tank containing (pH 7). The swelling ratio was determined from the weight change before and after the immersion as follows.
Swelling ratio = weight of sample after immersion / weight of sample before immersion The pull-out test was performed by applying a water-swellable friction reducing composition to an iron flat bar (200 × 75 × 3 mm) to a film thickness of about 1 mm and drying. It was inserted into a 1 L container (round can), cement mortar was poured into this container and solidified, and after one month, it was pulled out with a 50 kN autograph manufactured by Shimadzu Corporation to determine the pulling force.
アセトンに溶解した５０％濃度の酢酸ビニル樹脂エラストマー溶液３４６部に溶剤としてトルエン１４５部、メチル・エチルケトン（ＭＥＫ）を１４５部加え、ディゾルバーで撹拌しながらカルボキシメチルセルロースカルシウム（ＣＭＣ−Ｃａ）１７７部、ベントナイト１７２部、そして防錆剤としてアルキルアリルスルホン酸カルシウム塩／カルボン酸エステルカルシウム塩複合体（楠本化成 ＮＡ−ＳＵＬ ＣＡ／Ｗ１１４６）５部と微粒子シリカ１０部を加え、十分に撹拌して水膨潤性摩擦低減組成物（実施例１）を得た。
この実施例１の水膨潤性摩擦低減組成物は、淡水（ｐＨ７前後）での浸漬では膨潤率は２．０倍と非常に小さいが、ｐＨ１４のアルカリ溶液での浸漬では、１６倍前後の膨潤率であった。
表１に試験結果特性を示す。
To 346 parts of a 50% strength vinyl acetate resin elastomer solution dissolved in acetone, 145 parts of toluene and 145 parts of methyl ethyl ketone (MEK) are added as solvents, and 177 parts of carboxymethyl cellulose calcium (CMC-Ca) while stirring with a dissolver, bentonite. 172 parts, and 5 parts of alkylallyl sulfonic acid calcium salt / carboxylic acid ester calcium salt complex (Tsubakimoto Kasei NA-SUL CA / W1146) and 10 parts of fine-particle silica as a rust preventive agent, and sufficiently stirred to swell the water A friction reducing composition (Example 1) was obtained.
The water-swellable friction reducing composition of Example 1 has a very low swelling ratio of 2.0 times when immersed in fresh water (around pH 7), but is about 16 times when immersed in an alkaline solution at pH 14. It was rate.
Table 1 shows the test result characteristics.
アセトンに溶解した５０％濃度の酢酸ビニル樹脂エラストマー溶液３４６部に溶剤のトルエン２９０部加え、ディゾルバーで撹拌しながら、カルボキシメチルセルロース（ＣＭＣ−Ｈ）１９０部、ベントナイト１５８部、防錆剤としてアルキルナフタレンスルホン酸バリウム塩（楠本化成 ＮＡ−ＳＵＬ ＢＳＮ−５０ＭＳ）の１０部と微粒子シリカの６部を加え、十分に撹拌して水膨潤性摩擦低減組成物（実施例２）を得た。
実施例２の水膨潤性摩擦低減組成物は、淡水（ｐＨ７前後）での浸漬では膨潤はほとんど認められず、ｐＨ１４のアルカリ溶液での浸漬では、１２倍前後の膨潤率であった。
表１に試験結果特性を示す。
To 346 parts of a 50% strength vinyl acetate resin elastomer solution dissolved in acetone, 290 parts of toluene as a solvent is added, and stirred with a dissolver, 190 parts of carboxymethyl cellulose (CMC-H), 158 parts of bentonite, and alkylnaphthalene sulfone as a rust inhibitor. 10 parts of acid barium salt (Enomoto Kasei NA-SUL BSN-50MS) and 6 parts of fine-particle silica were added and stirred sufficiently to obtain a water-swellable friction reducing composition (Example 2).
The water-swellable friction reducing composition of Example 2 showed almost no swelling when immersed in fresh water (around pH 7), and a swelling ratio of around 12 times when immersed in an alkaline solution at pH 14.
Table 1 shows the test result characteristics.
トルエンに溶解した２０％濃度のエチレン・エチルアクリレート共重合樹脂エラストマー溶液５００部に溶剤のトルエン１１０部を加え、ディゾルバーで撹拌しながらカルボキシメチルセルロースアルミニウム（ＣＭＣ−Ａｌ）１９０部と充填材としてベントナイト１８０部を加え、十分撹拌して水膨潤性摩擦低減組成物（実施例３）を得た。
この実施例３の水膨潤性摩擦低減組成物は、淡水（ｐＨ７前後）浸漬での膨潤率は１．７倍と非常に小さいが、ｐＨ１４のアルカリ溶液での浸漬は、１３倍程度の膨潤率であった。
表１に試験結果特性を示す。
110 parts of toluene as a solvent is added to 500 parts of a 20% ethylene / ethyl acrylate copolymer resin elastomer solution dissolved in toluene, and 190 parts of carboxymethyl cellulose aluminum (CMC-Al) and 180 parts of bentonite as a filler while stirring with a dissolver. And sufficiently stirred to obtain a water-swellable friction reducing composition (Example 3).
The water-swellable friction reducing composition of Example 3 has a very small swelling ratio of 1.7 times when immersed in fresh water (around pH 7). However, when immersed in an alkaline solution at pH 14, the swelling ratio is about 13 times. Met.
Table 1 shows the test result characteristics.
比較例
アセトンに溶解した５０％濃度の酢酸ビニル樹脂エラストマー溶液３４６部に溶剤としてトルエン１４５部、メチル・エチルケトン（ＭＥＫ）を１４５部加え、ディゾルバーで撹拌しながらカルボキシメチルセルロースナトリウム１７７部、ベントナイト１７２部、微粒子シリカ１０部を加え、十分に撹拌して水膨潤性摩擦低減組成物（比較例）を得た。
表１に試験結果特性を示す。
Comparative Example To 346 parts of a 50% strength vinyl acetate resin elastomer solution dissolved in acetone, 145 parts of toluene and 145 parts of methyl ethyl ketone (MEK) were added as solvents, and 177 parts of sodium carboxymethyl cellulose and 172 parts of bentonite while stirring with a dissolver. 10 parts of fine particle silica was added and stirred sufficiently to obtain a water-swellable friction reducing composition (comparative example).
Table 1 shows the test result characteristics.
以上のように、本発明の水膨潤性摩擦低減組成物は、中性域では膨潤せず、アルカリ領域で膨潤するものであり、摩擦低減剤として作用する時期を制御することができるという特徴を有し、摩擦低減特性は、従来のものとほとんど変わることがない。 As described above, the water-swellable friction reducing composition of the present invention does not swell in the neutral region but swells in the alkaline region, and can control the time when it acts as a friction reducing agent. The friction reducing property is almost the same as the conventional one.
Claims (2)
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| JP2012077204A (en) * | 2010-10-01 | 2012-04-19 | Nippon Kagaku Toryo Kk | Water-swellable sealing material composition |
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