JP2000256054A - Inorganic sheet and its production - Google Patents
Inorganic sheet and its productionInfo
- Publication number
- JP2000256054A JP2000256054A JP6443599A JP6443599A JP2000256054A JP 2000256054 A JP2000256054 A JP 2000256054A JP 6443599 A JP6443599 A JP 6443599A JP 6443599 A JP6443599 A JP 6443599A JP 2000256054 A JP2000256054 A JP 2000256054A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- ethylene
- vinyl acetate
- inorganic
- water
- 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.)
- Granted
Links
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
- 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
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0045—Polymers chosen for their physico-chemical characteristics
- C04B2103/0053—Water-soluble polymers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主として建築板と
して用いる無機質抄造板およびその製造方法に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic paperboard mainly used as a building board and a method for producing the same.
【０００２】[0002]
【従来の技術】この種の無機質抄造板はセメント等の水
硬性材料と、木片、木質パルプ等の木質補強材とを主体
とする原料スラリーを抄造脱水して抄造シートとし、該
抄造シートを養生硬化せしめる湿式法によって製造され
るが、強度の向上やクラック発生の防止あるいは耐凍結
融解安定性のために、該スラリーにエチレン−酢酸ビニ
ル共重合体を液状エマルジョンとして添加することが提
案されている。2. Description of the Related Art In this type of inorganic papermaking board, a raw material slurry mainly composed of a hydraulic material such as cement and a wood reinforcing material such as a piece of wood or wood pulp is subjected to papermaking and dewatering to form a papermaking sheet. It is manufactured by a wet method of curing, but it has been proposed to add an ethylene-vinyl acetate copolymer to the slurry as a liquid emulsion in order to improve strength, prevent cracking, or freeze-thaw resistance. .
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
ような湿式抄造法において、液状エマルジョンをそのま
ゝ原料スラリーに添加しても、抄造時に流出し易く歩留
りが悪くなり、更に流出した液状エマルジョンが抄造担
体としてのフェルトやネット等の目詰まりを引き起こし
て濾水性が悪くなるため抄造時間が長くなり、製造上の
効率が悪くなると言う問題点を有する。液状エマルジョ
ンをスプレードライ法や凍結乾燥粉砕法などによって粉
末化したものを原料スラリーに添加する方法も提案され
ている。しかし通常は該液状エマルジョンにポリビニル
アルコール（ＰＶＡ）等の親水性の高い保護コロイドを
使用しているため、またその粉末化物の粒径が比較的小
さいために、原料スラリーに添加した時点で簡単に再乳
化してしまい、液状エマルジョンと同様の問題点が生ず
る。結局湿式抄造法において無機質抄造板を製造するに
あたり、エチレン−酢酸ビニル共重合体エマルジョンや
従来の該エマルジョン粉末化物を原料スラリーに添加し
ても、優れた強度や耐クラック性、耐凍結融解性を有す
る無機質抄造板を効率良く製造することが出来ない。し
たがって本発明が解決しようとする課題は、湿式抄造法
において、エチレン−酢酸ビニル共重合体を使用して優
れた強度や耐クラック性、耐凍結融解性を有する無機質
抄造板を効率良く提供することにある。However, in the above-mentioned wet papermaking method, even if the liquid emulsion is added to the raw material slurry as it is, the liquid emulsion easily flows out during papermaking and the yield is deteriorated. There is a problem in that clogging of a felt or a net as a papermaking carrier causes clogging and poor drainage, so that the papermaking time is prolonged and the production efficiency is deteriorated. A method has also been proposed in which a liquid emulsion obtained by pulverizing a liquid emulsion by a spray drying method, a freeze drying pulverization method, or the like is added to a raw material slurry. However, usually, since a highly hydrophilic protective colloid such as polyvinyl alcohol (PVA) is used in the liquid emulsion, and the particle size of the powdered material is relatively small, when the powder is added to the raw material slurry, it is easily prepared. Re-emulsification results in the same problems as liquid emulsions. In the end, when producing an inorganic paperboard in a wet papermaking method, even if an ethylene-vinyl acetate copolymer emulsion or the conventional powdered emulsion is added to the raw material slurry, excellent strength, crack resistance and freeze-thaw resistance are obtained. Cannot be efficiently produced. Therefore, the problem to be solved by the present invention is to provide an inorganic paperboard having excellent strength, crack resistance and freeze-thaw resistance by using an ethylene-vinyl acetate copolymer in a wet papermaking method. It is in.
【０００４】[0004]
【課題を解決するための手段】本発明者等は上記従来技
術の課題に鑑み鋭意検討を重ねた結果、本発明を完成さ
せるに至った。即ち本発明は水硬性材料と、木質補強材
と、水溶性繊維素系樹脂を保護コロイドとするエチレン
−酢酸ビニル共重合体エマルジョンの粉末化組成物とを
含有する混合物の抄造シートの硬化物からなる無機質抄
造板を提供するものであり、更に水硬性材料と木質補強
材を主体とする原料スラリーを抄造し脱水して抄造シー
トを形成し、該抄造シートをプレス成形後、養生硬化せ
しめることにより無機質抄造板とする製造法において、
水溶性繊維素系樹脂を保護コロイドとするエチレン−酢
酸ビニル共重合体エマルジョンの粉末化組成物を原料ス
ラリーに添加する無機質抄造板の製造方法を提供するも
のである。Means for Solving the Problems The present inventors have made intensive studies in view of the above-mentioned problems of the prior art, and as a result, completed the present invention. That is, the present invention is based on a cured product of a sheet-formed sheet of a mixture containing a hydraulic material, a wood reinforcing material, and a powdered composition of an ethylene-vinyl acetate copolymer emulsion having a water-soluble fibrous resin as a protective colloid. In addition, it is intended to provide an inorganic papermaking board, which is further formed by papermaking and dewatering a raw material slurry mainly composed of a hydraulic material and a wood reinforcing material to form a papermaking sheet, press-molding the papermaking sheet, and then curing and curing. In the manufacturing method of making an inorganic paperboard,
An object of the present invention is to provide a method for producing an inorganic papermaking board, wherein a powdered composition of an ethylene-vinyl acetate copolymer emulsion containing a water-soluble cellulose resin as a protective colloid is added to a raw material slurry.
【０００５】[0005]
【発明の実施の形態】〔水硬性材料〕本発明において使
用される水硬性材料としては、例えばポルトランドセメ
ント、高炉セメント、シリカセメント、フライアッシュ
セメント、アルミナセメント等のセメント類が例示され
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS [Hydraulic Material] Examples of hydraulic material used in the present invention include cements such as Portland cement, blast furnace cement, silica cement, fly ash cement and alumina cement.
【０００６】〔木質補強材〕本発明において使用される
木質補強材としては、例えば木粉、木質繊維、木質パル
プ、木質繊維束、木毛、木片、竹繊維、麻繊維、ヤシ繊
維等が例示される。[Wood reinforcing material] Examples of the wood reinforcing material used in the present invention include wood flour, wood fiber, wood pulp, wood fiber bundle, wood wool, wood chip, bamboo fiber, hemp fiber, palm fiber and the like. Is done.
【０００７】〔ケイ酸含有材料〕本発明においては、上
記水硬性材料に更にケイ酸含有材料が使用されてもよ
い。該ケイ酸含有材料としては、例えばケイ砂、ケイ石
の粉末、シリカヒューム、高炉スラグ、フライアッシ
ュ、シラスバルーン、パーライト等が例示される。[Silicic acid-containing material] In the present invention, a silicic acid-containing material may be used in addition to the hydraulic material. Examples of the silicic acid-containing material include silica sand, silica stone powder, silica fume, blast furnace slag, fly ash, shirasu balloon, pearlite, and the like.
【０００８】〔第三成分〕本発明においては、上記原料
混合物に更に、硫酸マグネシウム、アルミン酸ナトリウ
ム、アルミン酸カリウム、硫酸アルミニウム、水ガラス
等の硬化促進剤、その他二水石膏、半水石膏、無水石
膏、消石灰、生石灰等の活性石灰含有物質、バーミキュ
ライト、ベントナイト等の鉱物粉末、ワックス、パラフ
ィン、シリコン等の撥水剤、他の合成樹脂エマルジョン
等の補強材等が添加されてもよい。[Third component] In the present invention, the above raw material mixture is further added with a curing accelerator such as magnesium sulfate, sodium aluminate, potassium aluminate, aluminum sulfate, water glass, other gypsum dihydrate, hemihydrate gypsum, Activated lime-containing substances such as anhydrous gypsum, slaked lime and quick lime, mineral powders such as vermiculite and bentonite, water repellents such as wax, paraffin and silicon, and reinforcing materials such as other synthetic resin emulsions may be added.
【０００９】〔エチレン−酢酸ビニル共重合体エマルジ
ョン粉末化組成物〕本発明におけるエチレン−酢酸ビニ
ル共重合体（ＥＶＡ）エマルジョンの粉末化組成物と
は、水溶性保護コロイドとして水溶性繊維素系樹脂を用
いて定法のエマルジョン重合法によって製造されたエチ
レン−酢酸ビニル共重合体エマルジョンをスプレードラ
イ法や凍結乾燥粉砕法等の方法で粉末化／造粒すること
によって得られる物であり、その平均粒径は２０〜２０
０μｍであることが好ましく、更に好ましくは４０〜１
６０μｍ、最も好ましくは６０〜１００μｍの範囲であ
る。平均粒径が２０μｍを下回ると抄造時に該粉末化組
成物が再乳化し易くなり、２００μｍを越えると、養生
硬化後の抄造板中に該粉末化組成物を構成する共重合体
成分が均一に分布することが困難となり、充分な強度や
耐クラック性、耐凍結融解性が得られない。[Powdered composition of ethylene-vinyl acetate copolymer emulsion] The powdered composition of ethylene-vinyl acetate copolymer (EVA) emulsion in the present invention is a water-soluble cellulose resin as a water-soluble protective colloid. Is obtained by pulverizing / granulating an ethylene-vinyl acetate copolymer emulsion produced by a conventional emulsion polymerization method by using a method such as spray drying or freeze-drying pulverization. Diameter 20-20
0 μm, more preferably 40 to 1 μm.
60 μm, most preferably in the range of 60-100 μm. When the average particle size is less than 20 μm, the powdered composition is easily re-emulsified at the time of papermaking, and when the average particle size exceeds 200 μm, the copolymer component constituting the powdered composition is uniformly contained in the cured board after curing and curing. Distribution becomes difficult, and sufficient strength, crack resistance, and freeze-thaw resistance cannot be obtained.
【００１０】本発明において、エチレン−酢酸ビニル共
重合体エマルジョンの保護コロイドとして使用される水
溶性繊維素系樹脂としては、ヒドロキシアルキルセルロ
ース、ヒドロキシアルキルアルキルセルロース、カルボ
キシアルキルセルロース、アルキルセルロースからなる
群から選ばれることが望ましく、具体的にはヒドロキシ
エチルセルロース、ヒドロキシプロピルセルロース、ヒ
ドロキシプロピルメチルセルロース、ヒドロキシエチル
メチルセルロース、カルボキシメチルセルロース、メチ
ルセルロース、エチルセルロース等が例示される。In the present invention, the water-soluble cellulose resin used as a protective colloid of the ethylene-vinyl acetate copolymer emulsion is selected from the group consisting of hydroxyalkyl cellulose, hydroxyalkylalkyl cellulose, carboxyalkylcellulose and alkylcellulose. Desirably, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, carboxymethylcellulose, methylcellulose, ethylcellulose and the like are exemplified.
【００１１】上記水溶性繊維素系樹脂のエチレン−酢酸
ビニル共重合体エマルジョン中の含有量としては、０．
５〜１０重量％、好ましくは１〜５重量％であることが
好ましい。該水溶性繊維素系樹脂のエマルジョン中の含
有量が０．５重量％を下回るとエマルジョン重合の際の
エマルジョン安定性を確保することが出来ないので好ま
しくなく、１０重量％を上回るとエチレン−酢酸ビニル
共重合体エマルジョン組成物の粉末化組成物が抄造時に
再乳化し易くなるので好ましくない。The content of the water-soluble cellulose-based resin in the ethylene-vinyl acetate copolymer emulsion is set to 0.1.
It is preferably from 5 to 10% by weight, preferably from 1 to 5% by weight. If the content of the water-soluble cellulose resin in the emulsion is less than 0.5% by weight, it is not preferable because the emulsion stability during emulsion polymerization cannot be secured. It is not preferable because the powdered composition of the vinyl copolymer emulsion composition is easily re-emulsified during papermaking.
【００１２】本発明に使用されるエチレン−酢酸ビニル
共重合体エマルジョンにおけるエチレン−酢酸ビニル共
重合体のガラス転移点は、エチレンモノマーと酢酸ビニ
ルモノマーとの共重合比によって任意に調整することが
出来るが、概ね−３０〜３０℃の範囲で調整されるのが
好ましい。エチレン−酢酸ビニル共重合体のガラス転移
点Ｔｇが−３０℃を下回ると、抄造シートをプレス成形
する際に抄造シートとプレス用プレートが接着してしま
うおそれががあり、更に養生硬化後の硬化物の表面が粘
着性を帯びてくるおそれががあるので好ましくなく、Ｔ
ｇが３０℃を上回ると、酢酸ビニルの比率が大きくなっ
て共重合体が硬く脆くなり、無機質抄造板に充分な強度
や耐クラック性、耐凍結融解性を付与することが出来な
い。The glass transition point of the ethylene-vinyl acetate copolymer in the ethylene-vinyl acetate copolymer emulsion used in the present invention can be arbitrarily adjusted by the copolymerization ratio of the ethylene monomer and the vinyl acetate monomer. However, it is preferable that the temperature be adjusted in a range of approximately −30 to 30 ° C. When the glass transition point Tg of the ethylene-vinyl acetate copolymer is lower than -30 ° C, there is a possibility that the sheet for sheeting and the plate for pressing may adhere to each other when the sheet for sheeting is press-formed, and further curing after curing and curing. It is not preferable because the surface of the product may become tacky.
If g exceeds 30 ° C., the ratio of vinyl acetate becomes large, and the copolymer becomes hard and brittle, so that sufficient strength, crack resistance and freeze-thaw resistance cannot be imparted to the inorganic paper-made board.
【００１３】本発明における水溶性繊維素系樹脂を保護
コロイドとするエチレン−酢酸ビニル共重合体エマルジ
ョンの粉末化組成物には、粉末化／造粒後の粒子のブロ
ッキングを防止するために３〜２５重量％の無機フィラ
ーを含有することが望ましく、該無機フィラーの具体例
としてはシリカ、炭酸カルシウム、タルク、クレー、硫
酸バリウム、マイカ、ドロマイト等が例示される。該無
機フィラーの含有量が３重量％を下回ると耐ブロッキン
グ性の効果発現が困難となり、２５重量％を越えると養
生硬化後の抄造板中に該エマルジョン組成物を構成する
重合体成分が均一に分布することが困難となり、充分な
強度や耐クラック性、耐凍結融解性が得られない。In the present invention, the powdered composition of an ethylene-vinyl acetate copolymer emulsion containing a water-soluble fibrous resin as a protective colloid is used in order to prevent blocking of particles after powdering / granulation. It is desirable to contain 25% by weight of an inorganic filler, and specific examples of the inorganic filler include silica, calcium carbonate, talc, clay, barium sulfate, mica, and dolomite. When the content of the inorganic filler is less than 3% by weight, it becomes difficult to exhibit the anti-blocking effect, and when the content exceeds 25% by weight, the polymer component constituting the emulsion composition is uniformly contained in the sheet after curing and curing. Distribution becomes difficult, and sufficient strength, crack resistance, and freeze-thaw resistance cannot be obtained.
【００１４】本発明における水硬性材料と、木質補強材
と、水溶性繊維素系樹脂を保護コロイドとするエチレン
−酢酸ビニル共重合体エマルジョンの粉末化組成物とを
含有する混合物の抄造シートの硬化物からなる無機質抄
造板において、該粉末化組成物は該無機質抄造板中に
０．２〜１０重量％、好ましくは０．５〜５重量％の範
囲で含有することが好ましい。含有量が０．２重量％を
下回ると充分な強度や耐クラック性、耐凍結融解性を得
ることが困難となり、１０重量％を越えると得られた無
機質抄造板の寸法安定性が低下するので好ましくない。Curing of a sheet-formed sheet of a mixture containing the hydraulic material according to the present invention, a wood reinforcing material, and a powdered composition of an ethylene-vinyl acetate copolymer emulsion containing a water-soluble fibrous resin as a protective colloid. It is preferable that the powdered composition is contained in the inorganic papermaking board in an amount of 0.2 to 10% by weight, preferably 0.5 to 5% by weight. When the content is less than 0.2% by weight, it is difficult to obtain sufficient strength, crack resistance, and freeze-thaw resistance, and when the content exceeds 10% by weight, the dimensional stability of the obtained inorganic papermaking sheet is reduced. Not preferred.
【００１５】〔無機質抄造板の製造方法〕上記原料は混
合され、水を添加されてスラリーが調製される。上記原
料の混合割合は、水硬性材料：ケイ酸含有材料は、通常
４０：６０〜６０：４０重量比、木質補強材は上記原料
混合物中に通常１〜２０重量％、セメント硬化促進剤、
撥水剤等は数重量％程度とされ、更に上記ＥＶＡエマル
ジョン粉末化物は０．２〜１０重量％程度とされる。上
記原料混合物は通常３〜３５重量％の固形分濃度で水に
分散されてスラリーとされ、該スラリーはフェルト、ネ
ット等の抄造担体上に流し出され、吸引脱水されて抄造
シートとされる。上記ＥＶＡエマルジョン粉末化組成物
はスラリー中で再乳化しにくいので、抄造工程中に流出
しにくゝ抄造シート中に保持され易く、歩留りが向上し
かつ上記抄造担体の目詰まりも起りにくい。該抄造シー
トは次いで所望なればプレスによって圧搾脱水されある
いは表面にエンボス模様が付され、次いで養生される。
該抄造シートは所望なれば上記プレス前またはプレス後
で所定寸法に裁断されてもよい。養生としては常温、１
０〜８０時間の自然養生、温度４０〜２００℃、相対湿
度７０〜１００％、圧力１〜１０kg／cm2 で５〜１０時
間のオートクレーブ養生が適用されるが、上記自然養生
またはオートクレーブ養生に先立って、温度４０〜９０
℃、５〜１２時間の予備養生が行なわれてもよい。この
ようにして抄造シートは養生され、そして所望なれば乾
燥されかつトリミングされて製品とされる。[Method of Manufacturing Inorganic Paper Sheet] The above raw materials are mixed and water is added to prepare a slurry. The mixing ratio of the above raw materials is as follows: hydraulic material: silicic acid-containing material is usually 40:60 to 60:40 weight ratio, wood reinforcement is usually 1 to 20% by weight in the raw material mixture, cement hardening accelerator,
The water-repellent agent and the like are about several weight%, and the powdered EVA emulsion is about 0.2 to 10 weight%. The raw material mixture is usually dispersed in water at a solid content of 3 to 35% by weight to form a slurry, and the slurry is poured onto a papermaking carrier such as a felt or a net and suction-dehydrated to form a papermaking sheet. Since the powdered EVA emulsion composition is not easily re-emulsified in the slurry, it hardly flows out during the papermaking process, is easily held in the papermaking sheet, improves the yield, and does not easily cause clogging of the papermaking carrier. The sheet is then pressed and dewatered, if desired, or embossed on the surface, if desired, and then cured.
The sheet may be cut to a predetermined size before or after the pressing, if desired. Normal temperature for curing, 1
Autoclave curing for 0 to 80 hours, temperature of 40 to 200 ° C, relative humidity of 70 to 100%, pressure of 1 to 10 kg / cm 2 for 5 to 10 hours is applied, but prior to the above natural curing or autoclave curing. Temperature 40-90
Preliminary curing at 5 ° C. for 5 to 12 hours may be performed. The sheet is thus cured and, if desired, dried and trimmed into a product.
【００１６】〔実施例〕下記基本配合からなる原料に水
を添加し、攪拌混合して原料スラリーを調製する。 ポルトランドセメント ４０重量％ スラグ ３５ 〃 パーライト ８ 〃 ロックウール ４ 〃 パルプ ６ 〃 その他の添加剤（シリカ、マイカ等） ７ 〃 上記原料スラリーに更に表１に示す各種形態のエチレン
−酢酸ビニル共重合体（ＥＶＡ）を添加し、混合攪拌す
る。上記原料スラリーは１２重量％の固形分濃度とさ
れ、該原料スラリーはフェルト上に流し出され、吸引脱
水されて抄造マットとされる。抄造マットはプレス圧搾
脱水され、温度８０℃で８時間一次養生され、その後温
度１３５℃、８時間オートクレーブ養生され、最後に乾
燥（１２０℃、３時間）した上でトリミングして厚み１
２mmの製品とした。上記のようにして製造された各製品
の物性値は表２のとおりである。EXAMPLE A raw material slurry is prepared by adding water to a raw material having the following basic composition, followed by stirring and mixing. Portland cement 40% by weight slag 35 パ ー perlite 8 〃 rock wool 4 〃 pulp 6 〃 other additives (silica, mica, etc.) 7 に ethylene-vinyl acetate copolymer of various forms shown in Table 1 EVA), and mix and stir. The raw material slurry has a solid content of 12% by weight, and the raw material slurry is poured out onto a felt, suction-dehydrated, and formed into a papermaking mat. The papermaking mat was press-pressed and dewatered, primary cured at a temperature of 80 ° C. for 8 hours, then autoclaved at a temperature of 135 ° C. for 8 hours, and finally dried (120 ° C. for 3 hours) and trimmed to a thickness of 1 mm.
It was a 2 mm product. Table 2 shows the physical property values of the products manufactured as described above.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 〔試験法〕 曲げ強さ：ＪＩＳＡ １４０８ による。 端部凍結融解（凍融）試験：１０cm×２５cmの大きさの
試験片の長手方向の一端部を水を入れた容器内に浸漬す
る。この状態で１２時間凍結させ１２時間室温で融解さ
せ１サイクルとし、９０サイクル後の厚み変化率で表
す。 濾水性：原料スラリー１ｌを真空吸引ヌッチェ（一辺２
７cmの桝) に投入してその投入から脱水が完了するまで
の時間[Table 2] [Test method] Flexural strength: according to JISA 1408. End freeze-thaw (freeze-thaw) test: One end in the longitudinal direction of a test piece having a size of 10 cm × 25 cm is immersed in a container containing water. In this state, the mixture is frozen for 12 hours and thawed at room temperature for 12 hours to form one cycle, which is represented by a thickness change rate after 90 cycles. Drainage: 1 l of the raw material slurry is vacuum sucked by Nutsche (2 sides)
(7 cm square) and the time from the input to the completion of dehydration
【００１９】表２をみると、本発明の水溶性繊維素系樹
脂であるヒドロキシエチルセルロースおよびカルボキシ
メチルセルロースを保護コロイドとしたＥＶＡエマルジ
ョンの粉末化組成物を使用した実施例１〜６は、ＥＶＡ
エマルジョンを使用しないか、あるいはＰＶＡを保護コ
ロイドとしたＥＶＡエマルジョンをそのまゝまたは粉末
化した組成物を使用した比較例１〜５に比して原料スラ
リーの濾水性が良く、また曲げ強さや耐凍結融解性に優
れることがわかる。Referring to Table 2, Examples 1 to 6 using powdered compositions of EVA emulsion using hydroxyethylcellulose and carboxymethylcellulose as protective colloids, which are the water-soluble cellulose resins of the present invention, show EVA emulsions.
The drainage of the raw material slurry is better than those of Comparative Examples 1 to 5 in which an emulsion is not used, or an EVA emulsion in which PVA is used as a protective colloid is used as it is or in a powdered form. It turns out that it is excellent in freeze-thaw property.
【００２０】[0020]
【作用・効果】水溶性繊維素系樹脂はポリビニルアルコ
ール等よりも親水性が低く、したがって該水溶性繊維素
系樹脂を保護コロイドとしたエチレン−酢酸ビニル共重
合体エマルジョンの粉末化組成物は、原料スラリー中で
再乳化しにくい。そのために該粉末化組成物は抄造の際
の流出が少なく、歩留りが良くなりかつ原料スラリーの
濾水性も悪くならない。したがって本発明では優れた強
度や耐クラック性、耐凍結融解性を有する無機質抄造板
が効率良く提供される。[Function / Effect] The water-soluble cellulose resin has a lower hydrophilicity than polyvinyl alcohol and the like. Therefore, the powdered composition of the ethylene-vinyl acetate copolymer emulsion using the water-soluble cellulose resin as a protective colloid, It is difficult to re-emulsify in raw material slurry. For this reason, the powdered composition is less likely to flow out during papermaking, yield is improved, and drainage of the raw material slurry is not deteriorated. Therefore, in the present invention, an inorganic papermaking board having excellent strength, crack resistance and freeze-thaw resistance is efficiently provided.
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１２年３月１７日（２０００．３．１
７）[Submission date] March 17, 2000 (2003.
7)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項１[Correction target item name] Claim 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【手続補正２】[Procedure amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００４[Correction target item name] 0004
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【０００４】[0004]
【課題を解決するための手段】本発明者等は上記従来技
術の課題に鑑み鋭意検討を重ねた結果、本発明を完成さ
せるに至った。即ち本発明は水硬性材料と、木質補強材
と、水溶性繊維素系樹脂を保護コロイドとするエチレン
−酢酸ビニル共重合体エマルジョンの粉末化組成物とを
含有する原料スラリーの抄造シートの硬化物からなる無
機質抄造板を提供するものであり、更に水硬性材料と木
質補強材を主体とする原料スラリーを抄造し脱水して抄
造シートを形成し、該抄造シートをプレス成形後、養生
硬化せしめることにより無機質抄造板とする製造法にお
いて、水溶性繊維素系樹脂を保護コロイドとするエチレ
ン−酢酸ビニル共重合体エマルジョンの粉末化組成物を
原料スラリーに添加する無機質抄造板の製造方法を提供
するものである。Means for Solving the Problems The present inventors have made intensive studies in view of the above-mentioned problems of the prior art, and as a result, completed the present invention. That is, the present invention provides a cured product of a raw sheet slurry containing a hydraulic material, a wood reinforcing material, and a powdered composition of an ethylene-vinyl acetate copolymer emulsion having a water-soluble fibrous resin as a protective colloid. Further, the present invention provides an inorganic papermaking plate comprising: further forming a raw material slurry mainly composed of a hydraulic material and a wood reinforcing material, dewatering to form a papermaking sheet, press-molding the papermaking sheet, and curing and curing the sheet. The present invention provides a method for producing an inorganic papermaking board by adding a powdered composition of an ethylene-vinyl acetate copolymer emulsion containing a water-soluble fibrous resin as a protective colloid to a raw material slurry. It is.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０４Ｂ 18:26） 103:44 111:20 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat ゛ (Reference) C04B 18:26) 103: 44 111: 20
Claims (5)
素系樹脂を保護コロイドとするエチレン−酢酸ビニル共
重合体エマルジョンの粉末化組成物とを含有する混合物
の抄造シートの硬化物からなることを特徴とする無機質
抄造板1. A cured product of a sheet-formed sheet of a mixture containing a hydraulic material, a wood reinforcing material, and a powdered composition of an ethylene-vinyl acetate copolymer emulsion containing a water-soluble fibrous resin as a protective colloid. Inorganic paperboard characterized by consisting of
ョンの粉末化組成物の平均粒径は２０〜２００μｍであ
る請求項１に記載の無機質抄造板2. The inorganic paperboard according to claim 1, wherein the powdered composition of the ethylene-vinyl acetate copolymer emulsion has an average particle size of 20 to 200 μm.
ョンの保護コロイドである水溶性繊維素系樹脂が、ヒド
ロキシアルキルセルロース、ヒドロキシアルキルアルキ
ルセルロース、カルボキシアルキルセルロース、アルキ
ルセルロースからなる群から選ばれる少なくとも一つの
水溶性繊維素系樹脂である請求項１または２に記載の無
機質抄造板3. The water-soluble cellulose resin which is a protective colloid of the ethylene-vinyl acetate copolymer emulsion is at least one selected from the group consisting of hydroxyalkyl cellulose, hydroxyalkylalkyl cellulose, carboxyalkylcellulose, and alkylcellulose. The inorganic papermaking board according to claim 1 or 2, which is one water-soluble fibrous resin.
転移温度が−３０〜３０℃である請求項１〜３に記載の
無機質抄造板4. The inorganic papermaking board according to claim 1, wherein said ethylene-vinyl acetate copolymer has a glass transition temperature of -30 to 30 ° C.
スラリーを抄造し脱水して抄造シートを形成し、該抄造
シートをプレス成形後、養生硬化せしめることにより無
機質抄造板とする製造法において、水溶性繊維素系樹脂
を保護コロイドとするエチレン−酢酸ビニル共重合体エ
マルジョンの粉末化組成物を原料スラリーに添加するこ
とを特徴とする無機質抄造板の製造方法。5. A method of forming a raw material slurry mainly composed of a hydraulic material and a wood reinforcing material, dewatering it to form a paper sheet, press forming the paper sheet, curing it, and curing it to obtain an inorganic paper sheet. 3. The method for producing an inorganic paperboard according to claim 1, wherein a powdered composition of an ethylene-vinyl acetate copolymer emulsion containing a water-soluble cellulose resin as a protective colloid is added to the raw material slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6443599A JP3089001B1 (en) | 1999-03-11 | 1999-03-11 | Inorganic paperboard and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6443599A JP3089001B1 (en) | 1999-03-11 | 1999-03-11 | Inorganic paperboard and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP3089001B1 JP3089001B1 (en) | 2000-09-18 |
| JP2000256054A true JP2000256054A (en) | 2000-09-19 |
Family
ID=13258209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6443599A Expired - Fee Related JP3089001B1 (en) | 1999-03-11 | 1999-03-11 | Inorganic paperboard and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3089001B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2007696A1 (en) * | 2006-03-22 | 2008-12-31 | Leon Kruss | Construction product |
| CN102775091A (en) * | 2012-08-21 | 2012-11-14 | 牡丹江光明新型墙体材料有限公司 | Special moisture-holding thickening agent for masonry mortar and production method thereof |
-
1999
- 1999-03-11 JP JP6443599A patent/JP3089001B1/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2007696A1 (en) * | 2006-03-22 | 2008-12-31 | Leon Kruss | Construction product |
| EP2007696A4 (en) * | 2006-03-22 | 2011-05-25 | Leon Kruss | Construction product |
| CN102775091A (en) * | 2012-08-21 | 2012-11-14 | 牡丹江光明新型墙体材料有限公司 | Special moisture-holding thickening agent for masonry mortar and production method thereof |
| CN102775091B (en) * | 2012-08-21 | 2014-01-15 | 牡丹江光明新型墙体材料有限公司 | Special moisture-holding thickening agent for masonry mortar and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3089001B1 (en) | 2000-09-18 |
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