JP4846082B2 - Fast dispersible bentonite - Google Patents
Fast dispersible bentonite Download PDFInfo
- Publication number
- JP4846082B2 JP4846082B2 JP2000096552A JP2000096552A JP4846082B2 JP 4846082 B2 JP4846082 B2 JP 4846082B2 JP 2000096552 A JP2000096552 A JP 2000096552A JP 2000096552 A JP2000096552 A JP 2000096552A JP 4846082 B2 JP4846082 B2 JP 4846082B2
- Authority
- JP
- Japan
- Prior art keywords
- bentonite
- sodium bicarbonate
- water
- fast
- dispersibility
- 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.)
- Expired - Lifetime
Links
- 239000000440 bentonite Substances 0.000 title claims description 59
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 title claims description 59
- 229910000278 bentonite Inorganic materials 0.000 title claims description 58
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 42
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 21
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 5
- 229920000620 organic polymer Polymers 0.000 claims description 2
- 229940092782 bentonite Drugs 0.000 description 52
- 230000000694 effects Effects 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000002198 Annona diversifolia Nutrition 0.000 description 1
- 241000283014 Dama Species 0.000 description 1
- 241000282842 Lama glama Species 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical class [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- JNSGIVNNHKGGRU-JYRVWZFOSA-N diethoxyphosphinothioyl (2z)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetate Chemical compound CCOP(=S)(OCC)OC(=O)C(=N/OC)\C1=CSC(N)=N1 JNSGIVNNHKGGRU-JYRVWZFOSA-N 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229940080314 sodium bentonite Drugs 0.000 description 1
- 229910000280 sodium bentonite Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Silicates, Zeolites, And Molecular Sieves (AREA)
Description
【０００１】
【発明の属する技術分野】
この発明は、土木現場等で多く用いられるベントナイトの分散性を改善してなる速分散性ベントナイトに係り、特に、ナトリウム型ベントナイトの分散性を大幅に早めることができる速分散性ベントナイトに関する。
【０００２】
【従来技術とその課題】
粘度鉱物の一種であるベントナイトは、鋳物・鉄鋼・農薬・土木・農業土木等、多くの産業界で多様されているが、水との混合時に、攪拌効果が良くないと十分な性能が発揮できない。特に、この傾向は、ナトリウム型タイプのベントナイトでは顕著となる。
【０００３】
周知のように、ベントナイトは、水に分散させて使用するが、ベントナイトは結晶中に多量の水を含有し分散する機能を有しているので、１０〜３０％程度の濃度で高粘性の懸濁液となる。ベントナイトは、製品において一般に微粉であり、水に分散させる場合には、高速の攪拌機を用いるが、攪拌速度が遅い場合には、多量のベントナイトが水面に浮遊しダマとなり、水を吸収し分散するまでには相当の攪拌時間が必要となる。
【０００４】
例えば、小規模の土木現場でベントナイトを使用する場合、このような土木現場においては、十分な攪拌能力を有する攪拌機が設置されていないのが現状であり、作業性が優先されがちな上記現場においては、攪拌時に未分散のベントナイトダマが多く発生し、これをそのまま使用した場合には、本来のベントナイトの性能を十分に発揮することができない、という問題を有していた。このような傾向は、特に、高膨潤なベントナイトほど顕著であり、一般的には攪拌時間を十分にかけてベントナイトダマを無くした状態で使用すべきであるが、作業時間との関係で、迅速な分散性能を有するベントナイトの出現が当該技術分野では強く要望されていた。また、上記ベントナイトダマは、例えば、現場において網等で漉くって廃棄しなければならないため、この作業が非常に煩雑であり、また、省資源的観点からも無駄が多い、という問題をも有していた。
【０００５】
この発明は、かかる現状に鑑み創案されたものであって、その目的とするところは、６０秒以下の短時間で水と分散してベントナイトダマが発生せず、短時間でベントナイト本来の性能を十分に発揮することができ、ベントナイト投入作業を迅速に行うことができると共に、材料の無駄も生じない分散性に優れ、かつ、低コストで供給することができる速分散性ベントナイトを提供しようとするものである。
【０００６】
上記目的を達成するため、この発明にあっては、速分散性ベントナイトを、ベントナイト１００重量部に対して重炭酸ソーダ５〜３０重量部を混合し、６０秒以下の短時間でベントナイトダマを発生させることなく、ベントナイトの水への分散性を向上させたことを特徴とするものである。重炭酸ソーダの溶解濃度は、８％程度とそれ程高くはないが、水に対しては溶解性（速溶性）は非常に良好であり、水との親和性が悪いベントナイトに溶解性に優れた重炭酸ソーダを混入することで、速溶性が向上する。また、この重炭酸ソーダは、溶解時に水溶液の粘度を上昇させない効果がある。即ち、水に対する溶解性が良好な重炭酸ソーダが、ベントナイトより先に親和するが、そのとき、ベントナイトの溶解を阻害する水溶液の粘度上昇は見られない。さらに、この重炭酸ソーダは、水に溶解すると炭酸として水中に存在するが、この炭酸はベントナイトの水中での膨潤を抑制する作用があり、炭酸が溶解した液はベントナイトの膨潤を抑制することで、水との親和性が向上しダマの発生が低減される。これらの相互作用により、ベントナイトダマの発生が効率的に低減される。
【０００７】
この重炭酸ソーダの混合比としては、上記ベントナイト重量部１００部に対して重炭酸ソーダが５〜３０％に設定するのが望ましく、速分散性能が最も顕著な混合比は、１５〜３０％であり、この混合比で混合した場合には、速分散性が上昇するが、ベントナイトの膨潤は抑制される。
【０００８】
また、この発明にあっては、上記重炭酸ソーダが混合されたベントナイトに、例えば、ＣＭＣ（アクリル酸ポリマー）等の有機物ポリマーを所要量混合して生成する場合でも、同様な性能を得ることができる。
【０００９】
この発明に用いられる重炭酸ソーダ（重曹又は炭酸水素ナトリウムともいう。）は、その量が３０％を越えるとベントナイトの有効成分が大幅に減少し、また、５％以下では十分なベントナイトダマの消失性能が得られない。
【００１０】
また、この発明に用いられるベントナイトとしては、例えば、ワイオミング産のベントナイトが用いられ、分散速度が遅い高膨潤度のナトリウム型タイプのベントナイトであっても、本発明によれば、十分な速分散性能が得られ、作液作業性が大幅に向上する、という実践的に非常に有効な効果を得ることができる。
【００１１】
【発明の効果】
この発明に係る速分散性ベントナイトは、以上説明したように生成されているので、短時間で水と分散してベントナイトダマが発生せず、短時間でベントナイト本来の性能を十分に発揮させることができ、ベントナイト投入作業を迅速に行うことができると共に、ベントナイトダマ廃棄の必要性がなくなるので、材料の無駄もなくなり、分散性に優れたベントナイトを低コストで供給することができる等、幾多の優れた効果が得られる。
【００１２】
【実験例１】
次に、上記配合比によるベントナイトの分散性の実験を行った。この実験例において、Ｎｏ．１は、比重が２．５であるワイオミング産のベントナイト８０ｇを１リットルの水に分散したものであり、Ｎｏ．２乃至Ｎｏ．５は、Ｎｏ．１の液に比重２．２の重炭酸ソーダを、１．６ｇ、４．０ｇ、８．０ｇ、１６．０ｇの順に添加したものである。即ち、上記組成において、Ｎｏ．１〜Ｎｏ．５における重炭酸ソーダの混合比率は、０％、２％、５％、１０％、２０％である。このような組成からなるベントナイトの１分後の浮遊物重量を計測した結果を表１に示す。尚、下表において、ベントナイトの分散性は、攪拌棒で攪拌した後の１５秒後、３０秒後及び６０秒後の浮遊物の量を比較したものであり、また、ファンネル粘性は、浮遊物を目開き１．５ｍｍ網で除去した後の分散液の粘度を測定した。尚、表１は、Ｎｏ．１を１００とした場合の比較を示している。
【００１３】
【表１】
上記表１からも明らかなように、重炭酸ソーダを５％以上添加したベントナイトＮｏ．３〜Ｎｏ．５は、重炭酸ソーダを全く加えないＮｏ．１及び５％以下の２％しか添加していないＮｏ．２のベントナイトに比べ、ベントナイトダマが速やかに消失しており、重炭酸ソーダの量が多くなるほど、その効果が顕著となるのが解かる。
【００１５】
次に、重炭酸ソーダとベントナイトの混合物にＣＭＣを加えた場合の実験例を表２に示す。この場合の測定方法は、表１に示す測定方法と同様である。
【００１６】
【表２】
上記表２からも明らかなように、重炭酸ソーダを５％以上添加したベントナイトＮｏ．４〜Ｎｏ．５は、重炭酸ソーダを全く加えないＮｏ．１及び５％以下の１％又は２．５％しか添加していないＮｏ．１及びＮｏ．２のベントナイトに比べ、ＣＭＣを混合した場合であってもベントナイトダマが速やかに消失しており、重炭酸ソーダの量が多くなるほど、その効果が顕著となるのが解かる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fast dispersible bentonite that is improved in dispersibility of bentonite that is frequently used in civil engineering sites and the like, and more particularly to a fast dispersible bentonite that can greatly accelerate the dispersibility of sodium-type bentonite.
[0002]
[Prior art and its problems]
Bentonite, a kind of viscous mineral, is widely used in many industries such as castings, steel, agrochemicals, civil engineering, and agricultural civil engineering. However, when mixed with water, sufficient performance cannot be achieved when mixing with water. . In particular, this tendency becomes remarkable in sodium type bentonite.
[0003]
As is well known, bentonite is used by being dispersed in water, but since bentonite has a function of containing and dispersing a large amount of water in the crystal, it has a high viscosity suspension at a concentration of about 10 to 30%. It becomes a turbid liquid. Bentonite is generally a fine powder in products, and when it is dispersed in water, a high-speed stirrer is used. However, when the stirring speed is slow, a large amount of bentonite floats on the surface of the water and becomes lumpy, absorbing and dispersing water. A considerable amount of stirring time is required.
[0004]
For example, when using bentonite at a small-scale civil engineering site, in such a civil engineering site, it is the current situation that a stirrer having sufficient stirring ability is not installed, and in the above site where workability tends to be prioritized. Has a problem that many undispersed bentonite lumps are generated at the time of stirring, and when this is used as it is, the performance of the original bentonite cannot be sufficiently exhibited. Such a tendency is particularly noticeable for highly swelled bentonite, and should generally be used in a state where the agitation time is sufficient and the bentonite lumps are eliminated. The appearance of bentonite with performance has been strongly demanded in the art. In addition, the bentonite dama has to be disposed of on the site with a net or the like, so that this work is very complicated, and there is also a problem that it is wasteful from the viewpoint of resource saving. Was.
[0005]
The present invention was devised in view of the present situation, and the object of the present invention is to disperse with water in a short time of 60 seconds or less and to prevent the occurrence of bentonite lumps. An attempt is made to provide a fast dispersible bentonite that can be sufficiently exerted, can perform the bentonite charging operation quickly, has excellent dispersibility without causing material waste, and can be supplied at low cost. Is.
[0006]
In order to achieve the above object, according to the present invention, 5 to 30 parts by weight of sodium bicarbonate is mixed with 100 parts by weight of bentonite, and bentonite dams are generated in a short time of 60 seconds or less. In addition, the dispersibility of bentonite in water is improved . The dissolution concentration of sodium bicarbonate is not so high as about 8%, but the solubility (fast solubility) in water is very good, and sodium bicarbonate with excellent solubility is used for bentonite which has poor affinity with water. By mixing, fast solubility is improved. Further, this sodium bicarbonate has an effect of not increasing the viscosity of the aqueous solution at the time of dissolution. That is, sodium bicarbonate having good solubility in water has affinity before bentonite, but at that time, no increase in viscosity of the aqueous solution that inhibits dissolution of bentonite is observed. Furthermore, this sodium bicarbonate exists in water as carbonic acid when dissolved in water, but this carbonic acid has an action of suppressing the swelling of bentonite in water, and the solution in which carbonic acid is dissolved suppresses the swelling of bentonite. And the occurrence of lumps is reduced. Due to these interactions, the occurrence of bentonite dams is efficiently reduced.
[0007]
As the mixing ratio of this sodium bicarbonate, it is desirable to set sodium bicarbonate to 5 to 30% with respect to 100 parts by weight of the bentonite, and the mixing ratio with the most remarkable rapid dispersion performance is 15 to 30%. When mixed at a ratio, fast dispersibility increases, but swelling of bentonite is suppressed.
[0008]
In the present invention, the same performance can be obtained even when the required amount of organic polymer such as CMC (acrylic acid polymer) is mixed with the bentonite mixed with the sodium bicarbonate.
[0009]
Sodium bicarbonate (also referred to as sodium bicarbonate or sodium bicarbonate) used in the present invention greatly reduces the bentonite active ingredient when the amount exceeds 30%, and if it is less than 5%, the bentonite dam disappears sufficiently. I can't get it.
[0010]
In addition, as the bentonite used in the present invention, for example, Wyoming bentonite is used, and even if it is a high swelling sodium type bentonite with a low dispersion rate, according to the present invention, sufficient fast dispersion performance Can be obtained, and a practically very effective effect that the workability of liquid production is greatly improved can be obtained.
[0011]
【The invention's effect】
Since the fast dispersible bentonite according to the present invention is produced as described above, it can be dispersed with water in a short time without generating bentonite lumps, and can fully exhibit the original performance of bentonite in a short time. It is possible to perform the bentonite charging operation quickly and eliminate the need for the disposal of bentonite, so there is no waste of materials, and it is possible to supply bentonite with excellent dispersibility at a low cost. Effect.
[0012]
[Experiment 1]
Next, the experiment of the dispersibility of bentonite by the said mixture ratio was conducted. In this experimental example, no. No. 1 is obtained by dispersing 80 g of Wyoming bentonite having a specific gravity of 2.5 in 1 liter of water. 2 to No. 5 is No.5. 1. Sodium bicarbonate having a specific gravity of 2.2 was added to liquid 1 in the order of 1.6 g, 4.0 g, 8.0 g, and 16.0 g. That is, in the above composition, no. 1-No. The mixing ratio of sodium bicarbonate in 5 is 0%, 2%, 5%, 10%, 20%. Table 1 shows the results of measuring the weight of suspended matter after 1 minute of bentonite having such a composition. In the table below, the dispersibility of bentonite is a comparison of the amount of suspended matter after 15 seconds, 30 seconds and 60 seconds after stirring with a stir bar, and the funnel viscosity is The viscosity of the dispersion liquid was measured after removing with a 1.5 mm mesh. Table 1 shows No. A comparison when 1 is set to 100 is shown.
[0013]
[Table 1]
As apparent from Table 1 above, bentonite No. 5% added with sodium bicarbonate 5% or more. 3-No. No. 5 is a No. 5 sample containing no sodium bicarbonate. No. 1 and 5% or less added only 2%. It can be seen that the bentonite llama disappears more quickly than the bentonite of No. 2, and the effect becomes more remarkable as the amount of sodium bicarbonate increases.
[0015]
Next, Table 2 shows an experimental example when CMC was added to a mixture of sodium bicarbonate and bentonite. The measurement method in this case is the same as the measurement method shown in Table 1.
[0016]
[Table 2]
As apparent from Table 2 above, bentonite No. 5% added with sodium bicarbonate 5% or more. 4-No. No. 5 is a No. 5 sample containing no sodium bicarbonate. No. 1 or 5% or less, which is added only 1% or 2.5%. 1 and no. It can be seen that even when CMC is mixed, the bentonite dams disappear quickly, and the effect becomes more remarkable as the amount of sodium bicarbonate increases.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000096552A JP4846082B2 (en) | 2000-03-31 | 2000-03-31 | Fast dispersible bentonite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000096552A JP4846082B2 (en) | 2000-03-31 | 2000-03-31 | Fast dispersible bentonite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001278618A JP2001278618A (en) | 2001-10-10 |
| JP4846082B2 true JP4846082B2 (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000096552A Expired - Lifetime JP4846082B2 (en) | 2000-03-31 | 2000-03-31 | Fast dispersible bentonite |
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| Country | Link |
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| JP (1) | JP4846082B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008290923A (en) * | 2007-05-28 | 2008-12-04 | Kurosaki Hakudo Kogyo Kk | Modified bentonite with improved water dispersibility and its manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4742033A (en) * | 1987-01-29 | 1988-05-03 | Phillips Petroleum Company | Cracking catalysts comprising pillared clays |
| JPH09314538A (en) * | 1996-05-28 | 1997-12-09 | Kunimine Kogyo Kk | Method for producing clay-containing paste |
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| Publication number | Publication date |
|---|---|
| JP2001278618A (en) | 2001-10-10 |
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