JP3912433B2

JP3912433B2 - Papermaking cement molding and its manufacturing method

Info

Publication number: JP3912433B2
Application number: JP8158996A
Authority: JP
Inventors: 和夫横山; 丈尚加藤
Original assignee: A&A Material Corp
Current assignee: A&A Material Corp
Priority date: 1996-04-03
Filing date: 1996-04-03
Publication date: 2007-05-09
Anticipated expiration: 2016-04-03
Also published as: JPH09268044A

Description

【０００１】
【発明の属する技術分野】
本発明は、建築用内装及び外装材、特に曲面加工性及び弾性を有する抄造セメント成形体及びその製造方法に関するものである。
【０００２】
【従来の技術・課題】
曲面施工に利用される建築材として抄造石膏ボードが良く知られている。しかし、抄造石膏ボードは水によって崩壊してしまい、水回りで利用できなかった。そのため、内装材でしか利用できなかった。また、抄造石膏ボードにおいても、例えば半径５００ｍｍ程度の小さな曲面に加工する場合、抄造石膏ボードを一度水に浸けなければ加工することができなかった。更に、抄造石膏ボードは比重が大きく、それに伴って重量が重くなり、施工性が悪いと言った欠点がある。
【０００３】
従って、本発明の目的は、上記従来技術の欠点である建築用外装材としても利用可能であり、水付け工程を経ずに半径２００ｍｍ程度の曲面加工が可能であり、比較的軽量な抄造セメント成形体及びその製造方法を提供することにある。
【０００４】
【課題を解決するための手段】
即ち、本発明の抄造セメント成形体は、セメント１０〜５８重量％、セメントに対して不活性な粒径０．０５〜１ｍｍの粒子４０〜８０重量％、少なくとも木質パルプを含む補強繊維２〜１０重量％及びゴム系エマルジョン及び／または樹脂系エマルジョンを固形分として２０重量％以下含有してなることを特徴とする。
【０００７】
また、本発明の抄造セメント成形体の製造方法は、セメント１０〜５８重量％、セメントに対して不活性な粒径０．０５〜１ｍｍの粒子４０〜８０重量％、少なくとも木質パルプを含む補強繊維２〜１０重量％及びゴム系エマルジョンを固形分として２０重量％以下含有してなる原料混合物に、固形分の５〜２５倍（重量比）の水を添加してスラリーを得、次に、該スラリー全量に対して固形分として１〜１００重量ｐｐｍのカチオン性高分子凝集剤を添加し、更に、固形分として０．１〜５０重量ｐｐｍのアニオン性高分子凝集剤を添加し、次に、所定の形状に抄造成形した後、養生硬化することを特徴とする。
【０００８】
更に、本発明の抄造セメント成形体の製造方法は、セメント１０〜５８重量％、セメントに対して不活性な粒径０．０５〜１ｍｍの粒子４０〜８０重量％、少なくとも木質パルプを含む補強繊維２〜１０重量％及び樹脂系エマルジョンまたは樹脂系エマルジョンとゴム系エマルジョンを固形分として２０重量％以下含有してなる原料混合物に、固形分の５〜２５倍（重量比）の水を添加してスラリーを得、次に、該スラリー全量に対して固形分として５〜５００重量ｐｐｍのカチオン性高分子凝集剤を添加し、更に、固形分として０．１〜５０重量ｐｐｍのアニオン性高分子凝集剤を添加し、所定の形状に抄造成形した後、養生硬化することを特徴とする。
【０００９】
【発明の実施の形態】
本発明の抄造セメント成形体のセメントには、普通ポルトランドセメント、白色セメント等の他、必要に応じて、スラグ等の水硬性物質を使用することもできる。ここで、セメントの添加、配合量は１０〜５８重量％の範囲内である。セメントの添加、配合量が１０重量％未満であると、充分な結合強度が得られず、また、該添加、配合量が５８重量％を超えると、曲面加工が難しくなる。
【００１０】
また、セメントには、必要に応じて珪藻土、シリカヒューム、フライアッシュ等の非晶質シリカ源のようなセメントとポゾラン反応を示すポゾラン性物質を加えても良い。ポゾラン性物質は、抄造セメント成形体のかさ比重を低下させ、曲げ強度を向上させるので、ハンドリング性を向上させるためには有用な原料である。なお、ポゾラン性物質を添加する場合、その添加、配合量は２５重量％以下の範囲内である。該添加、配合量が２５重量％を超えると、得られる抄造セメント成形体のかさ比重は低下するが、セメントと反応しないポゾラン性物質が増加するため、曲げ強度が低くなり、ハンドリング性を低下させる原因となる。
【００１１】
セメントに対して不活性な粒子とは、炭酸カルシウム、珪砂等のセメントと反応しない物質を言い、添加により曲面加工性の向上が得られる。ただし、粒径が０.０５ｍｍ未満であるとほとんど曲面加工性が向上せず、また、１ｍｍを超えると著しく曲げ強度が低下するため、セメントに対して不活性にな粒子は、０.０５〜１ｍｍの粒径を有するものが好ましい。また、セメントに対して不活性な粒子の添加、配合量は４０〜８０重量％、好ましくは４５〜７０重量％の範囲内である。ここで、該添加、配合量が８０重量％を超えると、抄造セメント成形体の曲げ強度が弱くなり、抄造セメント成形体をその両端のみで支えた時に、抄造セメント成形体が自重に耐えられなくなり、そのためハンドリング性が著しく悪くなってしまう。なお、このハンドリング性は、抄造セメント成形体の曲げ強度が強く、かさ比重が低くなれば向上する。また、該添加、配合量が４０重量％未満では、曲面加工性が充分ではない。
【００１２】
補強繊維としては、木質パルプを利用することが不可欠である。木質パルプは抄造成形には必要不可欠であり、更に、抄造セメント成形体の補強剤の役割を担っている。また、補強繊維には、木質パルプの他に必要に応じてレーヨン、ポリプロピレン、アクリロニトリル、ポリビニルアルコール等の合成有機繊維、炭素繊維、耐アルカリ性ガラス繊維等を利用することができる。ここで、補強繊維の添加、配合量は２〜１０重量％の範囲内である。なお、該添加、配合量が１０重量％を超えると、繊維自身が分散しにくくなり、他の固形分との混合も困難になるため、抄造、成形し難くなり、得られる抄造セメント成形体の内部組織も不均一となる。また、該添加、配合量が２重量％未満であると、抄造時の粉体ロスが多くなり抄造性が悪くなる。
【００１３】
本発明の抄造セメント成形体は、セメント、セメントに対して不活性な粒子、補強繊維並びに任意成分であるポゾラン物質を上記配合割合を有する原料混合物に５〜２５倍(重量比)の水を添加して固形分を分散、混合してスラリーを形成し、所定の形状に抄造成形した後、例えば６０〜８０℃の温度で水蒸気養生または自然養生することにより得ることができる。このようにして得られる抄造セメント成形体は、水付け工程を行うことなしに、小半径の曲面加工を行うことができ、比較的軽量であるという特徴を有するものである。
【００１４】
なお、上記抄造セメント成形体の製造に際して、抄造時の固形分ロスを低減する目的で、スラリーに適宜アニオン性高分子凝集剤を添加することができる。アニオン性高分子凝集剤を添加する場合、その添加、配合量はスラリー全量に対して０.１〜５０重量ｐｐｍの範囲内である。該添加、配合量が５０重量ｐｐｍを超えるとスラリーの粘度が高くなり、濾過速度が遅くなり抄造性が悪くなる。
【００１５】
また、本発明の抄造セメント成形体には、固形分として２０重量％以下、好ましくは２〜１５重量％のゴム系エマルジョン及び／または樹脂系エマルジョンを配合する。これらエマルジョンを添加、配合することにより、得られる抄造セメント成形体の曲げ強度を向上させると共に、小半径の曲面加工性を更に向上させることができる。ここで、ゴム系エマルジョンまたは樹脂系エマルジョンの添加、配合量が固形分として２０重量％を超えると、抄造成形時に、濾過速度が遅くなり、抄造性が悪くなると共に、他の配合成分に比べて単価が著しく高いために、得られる抄造セメント成形体の単価を上昇させるために好ましくない。
【００１６】
ゴム系エマルジョンとしては、例えばスチレン−ブタジエン共重合体、ポリブタジエン等を利用することができ、また、樹脂系エマルジョンとしては、アクリルエマルジョン、酢酸ビニル−エチレン共重合体等を例示することができる。なお、曲面加工性向上の理由から、利用するゴム系エマルジョン、樹脂系エマルジョンはガラス転移点が比較的低いものを選定することが望ましいこともある。
【００１７】
ゴム系エマルジョンを含有してなる抄造セメント成形体は、セメント、セメントに対して不活性な粒子、補強繊維並びに任意成分であるポゾラン物質を上記配合割合を有する原料混合物に５〜２５倍(重量比)の水を添加して固形分を分散、混合してスラリーを形成し、次に、カチオン性高分子凝集剤を該スラリー全量に対して固形分として１〜１００重量ｐｐｍ添加してゴム系エマルジョンを小さなフロックとした後、更に、アニオン性高分子凝集剤を固形分として０.１〜５０重量ｐｐｍ添加してゴム系エマルジョンを他の固形分と共に凝集させ、次に所定の形状に抄造成形した後、例えば６０〜８０℃の温度で水蒸気養生または自然養生することにより得ることができる。ここで、カチオン性高分子凝集剤の添加、配合量が固形分として１重量ｐｐｍ未満であると、ゴム系エマルジョンが他の固形分と共に凝集されず、抄造時の濾水速度を低下し、更に、フェルトにエマルジョンが詰まったり、フェルトから抜けてロスの原因となる。また、該添加、配合量が固形分として１００重量ｐｐｍを超えると、逆に分散され、上記と同様の結果となる。また、アニオン性高分子凝集剤の添加、配合量が固形分として０.１重量ｐｐｍ未満であると、ゴム系エマルジョンが凝集されず、上記のカチオン性高分子凝集剤と同様に抄造性が悪くなる。更に、アニオン性高分子凝集剤の添加、配合量が固形分として５０重量ｐｐｍを超えると、アニオン性高分子凝集剤は粘度が高いため、スラリーの粘度を上昇させると共に、各フロックの保水量が増加し、濾水速度が低下し、抄造性が悪化する。
【００１８】
また、樹脂系エマルジョンを含有してなる抄造セメント成形体は、セメント、セメントに対して不活性な粒子、補強繊維並びに任意成分であるポゾラン物質を上記配合割合を有する原料混合物に５〜２５倍(重量比)の水を添加して固形分を分散、混合してスラリーを形成し、次に、カチオン性高分子凝集剤を該スラリー全量に対し固形分としてて５〜５００重量ｐｐｍ添加して樹脂系エマルジョンを小さなフロックとした後、更に、アニオン性高分子凝集剤を固形分として０.１〜５０重量ｐｐｍ添加して樹脂系エマルジョンを他の固形分と共に凝集させ、次に所定の形状に抄造成形した後、例えば６０〜８０℃の温度で水蒸気養生または自然養生することにより得ることができる。ここで、カチオン性高分子凝集剤の添加、配合量が固形分として５重量ｐｐｍ未満であると、樹脂系エマルジョンが他の固形分と共に凝集されず、抄造時の濾水速度を低下し、更に、フェルトにエマルジョンが詰まったり、フェルトから抜けてロスの原因となる。また、該添加、配合量が固形分として５００重量ｐｐｍを超えると、逆に分散され、上記と同様の結果となる。また、アニオン性高分子凝集剤の添加、配合量が固形分として０.１重量ｐｐｍ未満であると、樹脂系エマルジョンが凝集されず、上記のカチオン性高分子凝集剤と同様に抄造性が悪くなる。更に、アニオン性高分子凝集剤の添加、配合量が固形分として５０重量ｐｐｍを超えると、アニオン性高分子凝集剤は粘度が高いため、スラリーの粘度を上昇させると共に、各フロックの保水量が増加し、濾水速度が低下し、抄造性が悪化する。
【００１９】
なお、ゴム系エマルジョンと樹脂系エマルジョンを併用する場合には、上記樹脂系エマルジョンを用いる場合と同様の方法にて抄造セメント成形体を製造することができる。
【００２０】
ゴム系エマルジョン及び／または樹脂系エマルジョンを含有してなる抄造セメント成形体は、これらエマルジョンを含有しない抄造セメント成形体より、更に曲げ強度が向上し、小半径の曲面加工が可能となり、弾性にも富むものとなる。
【００２４】
【実施例】
以下に実施例を挙げて、本発明の抄造セメント成形体及びその製造方法を更に説明する。
実施例１
セメントとして普通ポルトランドセメント［日立セメント（株）社製］、セメントに対して不活性な粒子として粒径０．４ｍｍの寒水石［炭酸カルシウム：日立寒水石（株）社製］、ポゾラン性物質として珪藻土［日本鉱業（株）社製］、補強繊維として木質パルプ並びにゴム系エマルジョンとしてスチレン−ブタジエン共重合体ＳＢＲ０５８９（ガラス転移点５．５℃）、ＳＢＲ０５６１（ガラス転移点−６３℃）［日本合成ゴム（株）社製］、樹脂系エマルジョンとしてアクリルエマルジョンＡＥ−６１０Ｃ（ガラス転移点−６２℃）［日本合成ゴム（株）社製］を用い、これらを表１に示す配合比率で混合し、２５倍（重量比）の水を添加してスラリーとした。次に、該スラリーに、カチオン性高分子凝集剤としてセロポールＹＭ−５００［三洋化成工業（株）社製］をゴム系エマルジョンのみの場合には、固形分として５重量ｐｐｍ、樹脂系エマルジョンまたはゴム系エマルジョンと樹脂系エマルジョンを併用する場合には、固形分として１５重量ｐｐｍ添加し、その後、アニオン性高分子凝集剤サンクロックＡＨ４００Ｐ［三洋化成工業（株）社製］を０．５重量ｐｐｍ加えて抄造成形し、次に、１２０ｋｇ／ｃｍ^２の圧力でプレスすることにより加圧脱水し、次に、６０℃で８時間水蒸気養生することにより抄造セメント成形体を得た。
得られた抄造セメント成形体を６０℃で２４時間乾燥した後のかさ比重、曲げ強度、曲げ破壊時までのたわみ量の測定結果並びに抄造性の優劣を表１に併記する。
【００２５】
比較例１
セメント、寒水石、珪藻土、木質パルプ及びスチレン−ブタジエン共重合体を表１に示す配合比率で混合し、実施例１と同様の操作にて抄造セメント成形体を得た。
得られた抄造セメント成形体を６０℃で２４時間乾燥した後のかさ比重、曲げ強度、曲げ破壊時までのたわみ量の測定結果並びに抄造性の優劣を表１に併記する。
【００２６】
表１に示す結果から明らかなように、スチレン−ブタジエン共重合体の添加、配合量が多くなり過ぎると、曲げ強度が弱くなり、更に、抄造成形時に、濾水速度が遅くなり、抄造性に問題が生じた。
【００２７】
【表１】

【００２８】
表１中、「たわみ量」は、４０ｍｍ×１６０ｍｍ×６ｍｍ(厚さ)の寸法の試験体のスパン１００ｍｍにおける曲げ破壊時までのたわみ量を表す。
【００２９】
実施例２及び比較例２
セメント２０重量％、寒水石６０重量％、珪藻土１０重量％、木質パルプ５重量％及びスチレン−ブタジエン共重合体（ＳＢＲ０５８９）またはアクリルエマルジョン（ＡＥ−６１０Ｃ）固形分換算量５重量％並びに２５倍（重量比）の水を混合し、表２に示す添加量でカチオン性高分子凝集剤（セロポールＹＭ５００）及びアニオン性高分子凝集剤（サンフロックＡＨ−４００Ｐ）を添加し、抄造成形した時の抄造性の優劣を調べた。
得られた結果を表２に併記する。
【００３０】
【表２】

【００３１】
表２の結果から明らかなように、カチオン性高分子凝集剤の添加、配合量が本発明範囲よりも少ないと、ゴム系エマルジョンまたは樹脂系エマルジョンが凝集されず、フェルトの穴目に詰まって濾水速度を低下し、更に細かいものはロスとなって廃水と共に流れ出てしまい抄造性が劣るものとなった。逆に、カチオン性高分子凝集剤の添加、配合量が本発明範囲よりも多いと、凝集せず、逆に分散してしまい同様の結果となった。
また、アニオン性高分子凝集剤の添加、配合量が本発明範囲よりも少ないと、カチオン性高分子凝集剤と同様にゴム系エマルジョンまたは樹脂系エマルジョンの凝集が不充分となり、抄造性が悪くなった。逆に、アニオン性高分子凝集剤の添加、配合量が本発明範囲よりも多いと、スラリーの粘度が上がり、更に、各凝集体(フロック)が大きく、保水量も増加するので、濾水速度が遅くなり、抄造性が悪化した。
【００３２】
【発明の効果】
本発明の効果は、水付け工程を経ずに半径２００ｍｍ程度の曲面加工が可能であり、比較的軽量な抄造セメント成形体及びその製造方法を提供したことにある。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an interior and exterior material for buildings, and more particularly to a papermaking cement molded body having curved surface workability and elasticity, and a method for producing the same.
[0002]
[Conventional technologies and issues]
Papermaking gypsum board is well known as a building material used for curved construction. However, the paper-made gypsum board collapsed by water and could not be used around the water. Therefore, it was available only for interior materials. Also, in the papermaking gypsum board, for example, when processing into a small curved surface having a radius of about 500 mm, the papermaking gypsum board cannot be processed unless it is once immersed in water. In addition, the papermaking gypsum board has a large specific gravity, which increases the weight and has the disadvantage of poor workability.
[0003]
Therefore, the object of the present invention can be used as a building exterior material, which is a drawback of the above-described prior art, and can be processed into a curved surface with a radius of about 200 mm without going through a watering process, and is a relatively lightweight papermaking cement. It is providing the molded object and its manufacturing method.
[0004]
[Means for Solving the Problems]
That is, the papermaking cement molded body of the present invention has 10 to 58% by weight of cement, 40 to 80% by weight of particles having a particle diameter of 0.05 to 1 mm which is inert to the cement, and 2 to 10 reinforcing fibers containing wood pulp. It is characterized by containing 20% by weight or less of a rubber emulsion and / or a resin emulsion as a solid content.
[0007]
Moreover, the manufacturing method of the papermaking cement molded object of this invention is 10-58 weight% of cement, 40-80 weight% of particle | grains with a particle diameter of 0.05-1 mm which are inert with respect to cement, and the reinforced fiber containing a wood pulp at least To a raw material mixture containing 2 to 10% by weight of a rubber emulsion and 20% by weight or less as a solid content, water of 5 to 25 times (weight ratio) of the solid content is added to obtain a slurry. adding a cationic high molecular coagulant of 1 to 100 ppm by weight as solid content relative to the slurry entire amount, further, an anionic polymer coagulant of 0.1 to 50 ppm by weight was added as a solid, then It is characterized by curing and curing after paper-molding into a predetermined shape.
[0008]
Furthermore, the manufacturing method of the papermaking cement molded body of the present invention is a reinforcing fiber containing 10 to 58% by weight of cement, 40 to 80% by weight of particles having an inactive particle size of 0.05 to 1 mm , and at least wood pulp. To a raw material mixture containing 2 to 10% by weight and a resin-based emulsion or a resin-based emulsion and a rubber-based emulsion in a solid content of 20% by weight or less, water having a solid content of 5 to 25 times (weight ratio) is added. to obtain a slurry, then adding a cationic high molecular coagulant of 5 to 500 ppm by weight as a solid content with respect to the slurry entire amount, further, the anionic polymer flocculant of 0.1 to 50 ppm by weight as a solid content It is characterized by curing and curing after adding an agent and making it into a predetermined shape.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
As the cement of the papermaking cement molded body of the present invention, a hydraulic substance such as slag can be used, if necessary, in addition to ordinary Portland cement, white cement and the like. Here, the addition and blending amount of cement is in the range of 10 to 58% by weight. When the addition and blending amount of cement is less than 10% by weight, sufficient bond strength cannot be obtained. When the addition and blending amount exceeds 58% by weight, curved surface processing becomes difficult.
[0010]
Moreover, you may add the pozzolanic substance which shows pozzolanic reaction with cement like amorphous silica sources, such as diatomaceous earth, a silica fume, and a fly ash, as needed. The pozzolanic substance is a useful raw material for improving the handling property because it lowers the bulk specific gravity of the papermaking cement molding and improves the bending strength. In addition, when adding a pozzolanic substance, the addition and a compounding quantity are in the range of 25 weight% or less. When the addition and blending amount exceeds 25% by weight, the bulk specific gravity of the resulting papermaking cement molded article is lowered, but the pozzolanic material that does not react with cement is increased, so that the bending strength is lowered and the handling property is lowered. Cause.
[0011]
The particles that are inert to the cement are substances that do not react with the cement such as calcium carbonate and silica sand, and the curved surface processability can be improved by addition. However, when the particle size is less than 0.05 mm, the curved surface workability is hardly improved, and when it exceeds 1 mm, the bending strength is remarkably lowered. Those having a particle size of 1 mm are preferred. Further, the addition and blending amount of particles inert to the cement are in the range of 40 to 80% by weight, preferably 45 to 70% by weight. Here, when the added and blended amount exceeds 80% by weight, the bending strength of the papermaking cement molded body is weakened, and when the papermaking cement molded body is supported only at both ends, the papermaking cement molded body cannot withstand its own weight. For this reason, the handling property is remarkably deteriorated. This handling property can be improved if the bending strength of the papermaking cement molding is strong and the bulk specific gravity is low. Further, when the addition and blending amount is less than 40% by weight, curved surface processability is not sufficient.
[0012]
It is essential to use wood pulp as the reinforcing fiber. Wood pulp is indispensable for papermaking and further plays a role of reinforcing agent for papermaking cement moldings. In addition to wood pulp, synthetic organic fibers such as rayon, polypropylene, acrylonitrile, and polyvinyl alcohol, carbon fibers, alkali-resistant glass fibers, and the like can be used as the reinforcing fibers. Here, the addition and blending amount of the reinforcing fibers are in the range of 2 to 10% by weight. If the addition and blending amount exceeds 10% by weight, the fiber itself is difficult to disperse and mixing with other solids becomes difficult, making papermaking and molding difficult. The internal structure is also uneven. Further, if the addition and blending amount is less than 2% by weight, the powder loss at the time of papermaking increases and the papermaking property deteriorates.
[0013]
The paper-making cement molded body of the present invention adds 5 to 25 times (weight ratio) water to the raw material mixture having the above blending ratio of cement, cement-inactive particles, reinforcing fibers, and an optional component pozzolanic material. Then, after the solid content is dispersed and mixed to form a slurry and formed into a predetermined shape, it can be obtained by steam curing or natural curing at a temperature of 60 to 80 ° C., for example. The paper-making cement molded body obtained in this way is characterized by being able to perform curved processing with a small radius without performing a watering step and is relatively lightweight.
[0014]
In the production of the papermaking cement molded body, an anionic polymer flocculant can be appropriately added to the slurry for the purpose of reducing solid loss during papermaking. When an anionic polymer flocculant is added, the addition and blending amount are within the range of 0.1 to 50 ppm by weight with respect to the total amount of the slurry. If the addition and blending amount exceeds 50 ppm by weight, the viscosity of the slurry increases, the filtration rate becomes slow, and the papermaking property deteriorates.
[0015]
Further, the papermaking cement molded article of the present invention, 20 wt% or less as solid content, preferably you blend 2 to 15% by weight of the rubber emulsion and / or resin emulsion. By adding and blending these emulsions, it is possible to improve the bending strength of the resulting papermaking cement molded body and further improve the curved processability with a small radius. Here, when the addition of rubber-based emulsion or resin-based emulsion and the blending amount exceeds 20 % by weight as a solid content, the filtration rate is slowed at the time of paper-molding, and the paper-making property is deteriorated, compared with other blending components. Since the unit price is remarkably high, it is not preferable for increasing the unit price of the resulting papermaking cement molded body.
[0016]
As the rubber-based emulsion, for example, styrene-butadiene copolymer, polybutadiene and the like can be used. As the resin-based emulsion, acrylic emulsion, vinyl acetate-ethylene copolymer and the like can be exemplified. For reasons of improving curved surface processability, it may be desirable to select a rubber-based emulsion or resin-based emulsion having a relatively low glass transition point.
[0017]
The papermaking cement molding containing the rubber-based emulsion comprises 5 to 25 times (weight ratio) of the cement, the particles inert to the cement, the reinforcing fiber and the pozzolanic material which is an optional component in the raw material mixture having the above blending ratio. ) Water is dispersed and mixed to form a slurry, and then a cationic polymer flocculant is added in an amount of 1 to 100 ppm by weight as a solid content with respect to the total amount of the slurry. In addition, 0.1 to 50 ppm by weight of an anionic polymer flocculant as a solid content was added to agglomerate the rubber emulsion together with other solid content, and then formed into a predetermined shape. Then, it can obtain by carrying out steam curing or natural curing, for example at the temperature of 60-80 degreeC. Here, if the addition and blending amount of the cationic polymer flocculant is less than 1 ppm by weight as the solid content, the rubber-based emulsion is not agglomerated with other solid content, and the drainage speed at the time of papermaking is reduced. , The emulsion is clogged with the felt, or the felt falls out and causes loss. Moreover, when this addition and a compounding quantity exceed 100 weight ppm as solid content, it will disperse | distribute conversely and will become the result similar to the above. Further, if the addition and blending amount of the anionic polymer flocculant is less than 0.1 ppm by weight as a solid content, the rubber-based emulsion is not agglomerated and the papermaking property is poor as in the case of the cationic polymer flocculant. Become. Further, when the addition and blending amount of the anionic polymer flocculant exceeds 50 ppm by weight as the solid content, the viscosity of the anionic polymer flocculant is increased, so that the viscosity of the slurry is increased and the water retention amount of each floc is increased. It increases, the drainage speed decreases, and papermaking properties deteriorate.
[0018]
In addition, the papermaking cement molding containing the resin-based emulsion is 5 to 25 times as much as the raw material mixture having the above-mentioned blending ratio of the cement, the particles inert to the cement, the reinforcing fibers, and the optional pozzolanic substance ( (Weight ratio) water is added to disperse and mix the solid content to form a slurry, and then the cationic polymer flocculant is added to the slurry as a solid content in an amount of 5 to 500 ppm by weight as a resin. After making the system emulsion into small flocs, 0.1 to 50 ppm by weight of anionic polymer flocculant is added as a solid content, and the resin emulsion is aggregated with other solid contents, and then made into a predetermined shape. After molding, it can be obtained, for example, by steam curing or natural curing at a temperature of 60 to 80 ° C. Here, if the addition and blending amount of the cationic polymer flocculant is less than 5 ppm by weight as the solid content, the resin- based emulsion is not agglomerated with other solid content, and the drainage speed at the time of papermaking is reduced. , The emulsion is clogged with the felt, or the felt falls out and causes loss. Moreover, when this addition and a compounding quantity exceed 500 weight ppm as solid content, it will disperse | distribute conversely and will become the result similar to the above. Further, if the addition and blending amount of the anionic polymer flocculant is less than 0.1 ppm by weight as the solid content, the resin emulsion is not aggregated, and the papermaking property is poor as in the case of the cationic polymer flocculant. Become. Further, when the addition and blending amount of the anionic polymer flocculant exceeds 50 ppm by weight as the solid content, the viscosity of the anionic polymer flocculant is increased, so that the viscosity of the slurry is increased and the water retention amount of each floc is increased. It increases, the drainage speed decreases, and papermaking properties deteriorate.
[0019]
In addition, when using a rubber-type emulsion and a resin-type emulsion together, a papermaking cement molding can be manufactured by the method similar to the case where the said resin-type emulsion is used.
[0020]
Papermaking cement moldings containing rubber-based emulsions and / or resin-based emulsions have improved bending strength, can be processed with a curved surface with a small radius, and are also elastic. It will be rich.
[0024]
【Example】
The papermaking cement molded body and the method for producing the same according to the present invention will be further described below with reference to examples.
Example 1
Ordinary Portland cement (manufactured by Hitachi Cement Co., Ltd.) as cement, cryogenic stone with a particle diameter of 0.4 mm as particles inert to cement (calcium carbonate: manufactured by Hitachi Seisui Co., Ltd.) , as a pozzolanic substance Diatomaceous earth [manufactured by Nippon Mining Co., Ltd.] , wood pulp as reinforcing fiber, and styrene-butadiene copolymer SBR0589 (glass transition point 5.5 ° C.), SBR 0561 (glass transition point −63 ° C.) [Nippon Synthesis ] as rubber emulsion Rubber Co., Ltd.], acrylic emulsion AE-610C (glass transition point -62 ° C.) [manufactured by Nippon Synthetic Rubber Co., Ltd.] as a resin-based emulsion, and these are mixed at a blending ratio shown in Table 1, 25 times (weight ratio) water was added to form a slurry . Next, in the case where Cellolol YM-500 (manufactured by Sanyo Kasei Kogyo Co., Ltd.) is used as the cationic polymer flocculant in the slurry, the solid content is 5 wt ppm, resin emulsion or rubber. When using a combination emulsion and resin emulsion, add 15 ppm by weight as solids, then add 0.5 ppm by weight of anionic polymer flocculant Sunclock AH400P [manufactured by Sanyo Chemical Industries, Ltd.] Then, pressure-dehydration was performed by pressing at a pressure of 120 kg / cm ² , and then steam curing was performed at 60 ° C. for 8 hours to obtain a paper-making cement molded body.
Table 1 shows the results of measurement of bulk specific gravity, bending strength, deflection amount until bending failure, and superiority or inferiority of papermaking after the obtained papermaking cement molding was dried at 60 ° C for 24 hours.
[0025]
Comparative Example 1
Cement, cold water stone, diatomaceous earth, wood pulp and styrene-butadiene copolymer were mixed at the blending ratio shown in Table 1, and a papermaking cement molded body was obtained in the same manner as in Example 1 .
Table 1 shows the results of measurement of bulk specific gravity, bending strength, deflection amount until bending failure, and superiority or inferiority of papermaking after the obtained papermaking cement molding was dried at 60 ° C for 24 hours.
[0026]
As is apparent from the results shown in Table 1, when the addition and blending amount of the styrene-butadiene copolymer is excessive, the bending strength is weakened, and further, the draining speed is slowed during papermaking and the papermaking property is improved. There was a problem.
[0027]
[Table 1]

[0028]
In Table 1, “amount of deflection” represents the amount of deflection until bending failure in a span of 100 mm of a specimen having a size of 40 mm × 160 mm × 6 mm (thickness).
[0029]
Example 2 and Comparative Example 2
20% by weight of cement, 60% by weight of garnet, 10% by weight of diatomaceous earth, 5% by weight of wood pulp, and 5% by weight and 25 times as much as the solid content of styrene-butadiene copolymer (SBR0589) or acrylic emulsion (AE-610C) (Weight ratio) water was mixed, and the cationic polymer flocculant (Celopol YM500) and anionic polymer flocculant (Sanfloc AH-400P) were added at the addition amounts shown in Table 2, and the papermaking was performed. Sexual superiority or inferiority was examined.
The obtained results are also shown in Table 2.
[0030]
[Table 2]

[0031]
As is apparent from the results in Table 2, when the addition and blending amount of the cationic polymer flocculant is less than the range of the present invention, the rubber emulsion or the resin emulsion is not agglomerated and clogged in the felt holes. The water speed was lowered, and finer ones were lost and flowed with the wastewater, resulting in poor papermaking. On the contrary, when the addition amount and the blending amount of the cationic polymer flocculant are larger than the range of the present invention, the agglomeration does not occur, but the dispersion disperses and the same result is obtained.
Also, if the addition and blending amount of the anionic polymer flocculant is less than the range of the present invention, the aggregation of the rubber emulsion or the resin emulsion becomes insufficient as in the case of the cationic polymer flocculant, resulting in poor papermaking. It was. Conversely, if the amount of the anionic polymer flocculant added and blended is greater than the range of the present invention, the viscosity of the slurry increases, and each aggregate (floc) is large and the water retention amount increases, so the drainage rate However, papermaking properties deteriorated.
[0032]
【The invention's effect】
The effect of the present invention is to provide a relatively lightweight paper-making cement molded body and a method for producing the same, which can be curved with a radius of about 200 mm without going through a watering step.

Claims

10 to 58% by weight of cement, 40 to 80% by weight of particles having a particle diameter of 0.05 to 1 mm inert to the cement, 2 to 10% by weight of reinforcing fibers containing at least wood pulp, and rubber-based emulsion and / or resin system A papermaking cement molded article containing an emulsion in a solid content of 20% by weight or less.

10 to 58% by weight of cement, 40 to 80% by weight of particles having a particle diameter of 0.05 to 1 mm that is inert to the cement, 2 to 10% by weight of reinforcing fibers containing at least wood pulp, and a rubber emulsion as a solid content of 20 A slurry is obtained by adding 5 to 25 times (weight ratio) water of solid content to a raw material mixture containing not more than wt%, and then 1 to 100 ppm by weight as solid content with respect to the total amount of the slurry. Add a cationic polymer flocculant, and further add an anionic polymer flocculant of 0.1 to 50 ppm by weight as a solid content, and then form and shape into a predetermined shape, followed by curing and curing. The manufacturing method of the papermaking cement molding characterized by the above-mentioned.

10 to 58% by weight of cement, 40 to 80% by weight of particles having a particle diameter of 0.05 to 1 mm which is inert to the cement, 2 to 10% by weight of reinforcing fibers containing at least wood pulp, and a resin-based emulsion or a resin-based emulsion To a raw material mixture containing 20% by weight or less of a rubber-based emulsion as a solid content, 5 to 25 times (weight ratio) water of the solid content is added to obtain a slurry, and then solid based on the total amount of the slurry. After adding 5 to 500 ppm by weight of the cationic polymer flocculant, and further adding 0.1 to 50 ppm by weight of the anionic polymer flocculant as the solid content, A method for producing a papermaking cement molded article, characterized by curing and curing.