JPH1179821A - Production of ligneous cement plate - Google Patents

Production of ligneous cement plate

Info

Publication number
JPH1179821A
JPH1179821A JP24982297A JP24982297A JPH1179821A JP H1179821 A JPH1179821 A JP H1179821A JP 24982297 A JP24982297 A JP 24982297A JP 24982297 A JP24982297 A JP 24982297A JP H1179821 A JPH1179821 A JP H1179821A
Authority
JP
Japan
Prior art keywords
reinforcing material
wood
ligneous
cement
mat
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
Application number
JP24982297A
Other languages
Japanese (ja)
Other versions
JP3919892B2 (en
Inventor
Takashige Akie
孝重 秋江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nichiha Corp
Original Assignee
Nichiha Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nichiha Corp filed Critical Nichiha Corp
Priority to JP24982297A priority Critical patent/JP3919892B2/en
Publication of JPH1179821A publication Critical patent/JPH1179821A/en
Application granted granted Critical
Publication of JP3919892B2 publication Critical patent/JP3919892B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
    • 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)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a ligneous cement plate of high strength regardless of the kinds of ligneous reinforcing materials by admixing a ligneous reinforcing material that previously undergoes cement setting-inhibitory treatment through a specific means to a cement inorganic powder and by subjecting them to a prescribed treatment. SOLUTION: A ligneous reinforcing material is treated with water to make the water content almost uniform at least on its surface, then coated with an aqueous mineral acid solution and an alkali metal silicate is admixed to the treated ligneous reinforcing material thereby producing the ligneous reinforcing material undergoing the cement curing-inhibitory treatment. The resultant ligneous reinforcing material is admixed to a cement inorganic powder to prepare the forming material. This forming material are sprayed on a mold plate to form a mat. Then, the formed mat is compressed together with the mold plate, then aged and cured to give the objective ligneous cement plate. In this invention, a regenerated ligneous reinforcing material that is regenerated from ligneous scraps having an anxiety that they would be include kinds of trees containing large amounts of cement curing-inhibitory substances (saccharides) can be used as a ligneous reinforcing material.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は主として建築材料と
して用いられる木質セメント板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 a method for producing a wood cement board mainly used as a building material.

【０００２】[0002]

【発明の背景】木質セメント板は木質補強材とセメント
系無機材料とを主な原料として湿式法、乾式法あるいは
半乾式法によって製造されている。該木質補強材として
は木片、木毛、木質パルプ等が用いられるが、近年木質
資源が不足の傾向にあり、また地球環境保護の観点から
も木質資源の節約が求められている。したがって最近木
質資源の節約のために木造建築物を解体する際に発生す
る古材、製材工程から発生する鋸屑や端材、針葉樹の間
伐材、木質セメント板のスクラップ等従来では埋立てや
焼却して処分されている木質スクラップから再生した木
質補強材の使用が検討されている。しかしながら上記木
質スクラップは多種多様の樹種からなり、したがって該
木質スクラップにはセメントの硬化阻害物質となる糖類
を多量に含む樹種も混入され、このような樹種を木質ス
クラップから除去することは非常に手間がかゝり困難な
作業となる。したがって木質スクラップから再生した木
質補強材を木質セメント板の原料として実用的に使用す
るには、セメントの硬化阻害を惹起するような樹種が混
入していても、セメントの硬化を円滑に進めることが出
来るようにしなければならない。BACKGROUND OF THE INVENTION Wood cement boards are manufactured by a wet method, a dry method or a semi-dry method using a wood reinforcing material and a cement-based inorganic material as main raw materials. As the wood reinforcing material, wood chips, wood wool, wood pulp, and the like are used. However, in recent years, wood resources tend to be in short supply, and from the viewpoint of global environmental protection, saving of wood resources is required. Therefore, in recent years, waste materials such as old materials generated when dismantling wooden buildings to save wood resources, sawdust and offcuts from the sawmilling process, thinning materials of softwood, scraps of wood cement boards, etc. are conventionally landfilled or incinerated. The use of wood reinforcement recycled from scrap wood that has been disposed of is being considered. However, the above-mentioned woody scraps are composed of a wide variety of tree species, and therefore, the woody scraps are mixed with woody species containing a large amount of saccharides which are substances that inhibit the setting of cement, and it is very troublesome to remove such woody species from the woody scraps. This is a difficult task. Therefore, in order to practically use the wood reinforcing material regenerated from wood scrap as a raw material for wood cement boards, it is necessary to smoothly promote the hardening of the cement even if wood species that cause inhibition of hardening of the cement are mixed. You have to be able to do it.

【０００３】[0003]

【従来の技術】従来、木質補強材に含有される糖類によ
るセメント硬化阻害を解消するためには、木質補強材中
に塩化カルシウム、塩化マグネシウム、塩化アルミニウ
ム等の金属塩を含浸したり混合することによってセメン
トの硬化を促進する方法（特開昭５１−２６９３０号、
特開昭５１−１５１７２２号、特開昭６０−１１８６５
８号等）、木質補強材を硫酸根を有する塩および／また
は酢酸根を有する塩と、ケイ酸塩との混合溶液中に浸漬
処理する方法（特開昭５５−２０２５１号、特開昭５５
−１１３５１３号、特公昭６１−５４２１号等）等が提
供されている。2. Description of the Related Art Conventionally, in order to eliminate the inhibition of cement hardening due to saccharides contained in a wood reinforcing material, a metal salt such as calcium chloride, magnesium chloride or aluminum chloride is impregnated or mixed with the wood reinforcing material. Method for accelerating the hardening of cement (JP-A-51-26930,
JP-A-51-151722, JP-A-60-11865
No. 8, etc.), and a method of immersing a wood reinforcing material in a mixed solution of a salt having a sulfate group and / or a salt having an acetate group and a silicate (JP-A-55-20251, JP-A-55-20251)
No. 113513, JP-B-61-5421, etc.).

【０００４】[0004]

【発明が解決しようとする課題】上記従来の技術では使
用される金属塩やケイ酸塩は主としてセメントの硬化促
進剤であり、原料中に木質補強材から糖類が溶出しない
うちにセメントの硬化を進めようとするものである。し
かし糖類を多く含む樹種が混在している場合には、セメ
ントが硬化する前に糖類が溶出して来てしまい、セメン
トの硬化が阻害され、特に木質スクラップから再生され
た再生木質補強材を利用する場合には、このような糖類
を多く含む樹種が混在しない保証はなく、安定して高品
質の製品を得ることが困難であった。In the above prior art, the metal salts and silicates used are mainly cement hardening accelerators, and harden the cement before the sugars elute from the wood reinforcing material in the raw material. It is going to proceed. However, when wood species containing a lot of sugars are mixed, the sugars elute before the cement hardens, and the hardening of the cement is hindered.In particular, recycled wood reinforcing materials recovered from wood scrap are used. In this case, there is no guarantee that such tree species containing a large amount of such sugars will not be mixed, and it has been difficult to stably obtain high-quality products.

【０００５】[0005]

【課題を解決するための手段】本発明は上記従来の課題
を解決するための手段として、水を添加して少なくとも
表面部分の含水率を略均一にした木質補強材に鉱酸水溶
液を付着させる工程１、鉱酸水溶液を付着させた該木質
補強材にアルカリ金属ケイ酸塩を添加混合することによ
ってセメント硬化阻害防止処理を施す工程２、セメント
硬化阻害防止処理を施した該木質補強材をセメント系無
機粉体に混合して成形原料を調製する工程３、該成形原
料を型板上に散布してマットをフォーミングする工程
４、該マットを型板と共に圧締してから養生硬化せしめ
る工程５、以上の工程からなる木質セメント板の製造方
法を提供するものであり、該木質補強材は木質スクラッ
プから再生された再生木質補強材であることが望まし
い。According to the present invention, as a means for solving the above-mentioned conventional problems, a mineral acid aqueous solution is adhered to a wood reinforcing material whose water content is at least substantially uniform by adding water. Step 1, a step of performing a cement hardening inhibition treatment by adding and mixing an alkali metal silicate to the wood reinforcing material to which a mineral acid aqueous solution is adhered; Step 3 of preparing a molding raw material by mixing with a system inorganic powder, Step 4 of spraying the molding raw material on a template and forming a mat, Step 5 of pressing the mat together with the template and curing and curing. The present invention provides a method for manufacturing a wood cement board comprising the above steps, and it is preferable that the wood reinforcing material is a recycled wood reinforcing material recycled from wood scrap.

【０００６】[0006]

【発明の実施の形態】BEST MODE FOR CARRYING OUT THE INVENTION

〔セメント系無機粉体〕本発明に使用されるセメント系
無機粉体とは、ケイ酸カルシウムを主成分とした水硬性
の無機粉体であり、このような無機粉体としては、例え
ばポルトランドセメント、あるいはポルトランドセメン
トに高炉スラグを混合した高炉セメント、フライアッシ
ュを混合したフライアッシュセメント、火山灰、シリカ
フューム、白土等のシリカ物質を混合したシリカセメン
ト、アルミナセメント、高炉スラグ等がある。[Cement-based inorganic powder] The cement-based inorganic powder used in the present invention is a hydraulic inorganic powder containing calcium silicate as a main component, such as Portland cement Alternatively, there are blast furnace cement in which blast furnace slag is mixed with Portland cement, fly ash cement in which fly ash is mixed, silica cement in which silica materials such as volcanic ash, silica fume, and clay are mixed, alumina cement, blast furnace slag, and the like.

【０００７】〔木質補強材〕本発明に用いられる木質補
強材としては、木粉、木毛、木片、木質繊維、木質パル
プ、木質繊維束等があるが、該木質補強材は竹繊維、麻
繊維、バカス、モミガラ、稲わら等のリグノセルロース
を主成分とする材料を混合してもよい。好ましい木質補
強材としては巾０．５〜２．０mm、長さ１〜２０mm、ア
スペクト比（長さ／厚み）２０〜３０の木片や、直径
０．１〜２．０mm、長さ２〜３５mmの分枝および／また
は彎曲および／または折曲した木質繊維束がある。本発
明では上記木質補強材として木質スクラップから再生し
たものを使用することが出来る。上記木質スクラップと
しては、例えば木造建築物を解体する際に発生する古
材、製材工程から発生する鋸屑や端材、合板製造工程か
ら発生するベニヤレースの端材、針葉樹の間伐材、木質
セメント板の端材やスクラップ等がある。更に本発明で
は竹繊維、竹チップ、麻繊維、ヤシ繊維、サトウキビの
搾り滓等の木材以外の木質補強材を使用することも出来
る。[Wood reinforcement] Wood reinforcement, wood wool, wood chip, wood fiber, wood pulp, wood fiber bundle, etc. are used as wood reinforcement in the present invention. A material containing lignocellulose as a main component such as fiber, bacas, fir, rice straw, etc. may be mixed. Preferred wood reinforcements are wood chips of 0.5 to 2.0 mm in width, 1 to 20 mm in length, 20 to 30 aspect ratios (length / thickness), 0.1 to 2.0 mm in diameter, and 2 to 35 mm in length. And / or bent and / or bent wood fiber bundles. In the present invention, recycled wood scrap can be used as the wood reinforcing material. Examples of the woody scrap include old wood generated when dismantling a wooden building, sawdust and offcuts generated from a sawmilling process, offcuts of veneer lace generated from a plywood manufacturing process, thinned coniferous wood, and wood cement board. Scraps and scraps. Further, in the present invention, a wood reinforcing material other than wood, such as bamboo fiber, bamboo chips, hemp fiber, coconut fiber, and sugarcane scum can also be used.

【０００８】〔セメント硬化阻害防止処理〕上記木質補
強材にはまず水が添加混合される。該水の添加量は該木
質補強材の少なくとも表面部分の含水率が略均一になる
ような量に調節する。このようにして少なくとも表面部
分の含水率を略均一にされた木質補強材には次いで鉱酸
水溶液が付着せしめられる（工程１）。上記鉱酸を例示
すれば、例えば塩酸、硫酸、硝酸、リン酸等であり、水
溶液中の鉱酸濃度は通常１〜５重量％程度にされる。上
記木質補強材に上記鉱酸水溶液を付着せしめるには、例
えば該木質補強材に鉱酸水溶液をスプレーし攪拌混合す
る方法が適用される。上記したように該木質補強材の表
面部分の含水率は略均一にされているので、該木質補強
材に鉱酸水溶液を付着させた時、該鉱酸水溶液は該木質
補強材の芯部にまで含浸されず、大部分は該木質補強材
の表面に略均一にとどまる。上記水添加処理が施されな
い木質補強材の場合は、表面部分の含水率にばらつきが
あり、該木質補強材に鉱酸水溶液を付着させた場合に
は、木質補強材の表面にとどまる鉱酸水溶液の量に大き
なばらつきを生じることになる。木質補強材に対する該
鉱酸水溶液の付着量は、該木質補強材表面部分のｐＨが
２〜５になるようにすることが好ましい。上記鉱酸付着
処理が施された木質補強材には次いでアルカリ金属ケイ
酸塩が添加混合せしめられる（工程２）。該アルカリ金
属ケイ酸塩とは例えばケイ酸リチウム、ケイ酸カリウ
ム、ケイ酸ナトリウム等であり、上記ケイ酸アルカリ金
属塩は二種以上混合使用されてもよく、望ましいケイ酸
アルカリ金属塩としては、安価で入手し易いケイ酸カリ
ウム、ケイ酸ナトリウムがある。また該ケイ酸アルカリ
金属塩において望ましいケイ酸とアルカリ金属のモル比
はＳi Ｏ2 ／Ｎa2Ｏ＝２〜４，Ｓi Ｏ2 ／Ｋ2 Ｏ＝３〜
４である。上記アルカリ金属ケイ酸塩の添加量は通常木
質補強材に対して２〜１０重量％とされる。[Cement Hardening Inhibition Prevention Treatment] First, water is added to and mixed with the above-mentioned wood reinforcing material. The amount of the water added is adjusted so that the water content of at least the surface portion of the wood reinforcing material becomes substantially uniform. A mineral acid aqueous solution is then applied to the wood reinforcing material having at least a surface portion having a substantially uniform moisture content as described above (step 1). Examples of the above mineral acids include hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid and the like, and the concentration of the mineral acid in the aqueous solution is usually about 1 to 5% by weight. In order to attach the mineral acid aqueous solution to the wood reinforcing material, for example, a method of spraying a mineral acid aqueous solution onto the wood reinforcing material and mixing with stirring is applied. As described above, the water content of the surface portion of the wood reinforcing material is substantially uniform, so that when the mineral acid aqueous solution is attached to the wood reinforcing material, the mineral acid aqueous solution is applied to the core of the wood reinforcing material. To a large extent, they remain substantially uniformly on the surface of the wood reinforcement. In the case of the wood reinforcing material which is not subjected to the water addition treatment, the water content of the surface portion varies, and when the mineral acid aqueous solution is attached to the wood reinforcing material, the mineral acid aqueous solution which remains on the surface of the wood reinforcing material Large variations occur in the amount of It is preferable that the amount of the mineral acid aqueous solution adhered to the wood reinforcing material is such that the pH of the surface of the wood reinforcing material is 2 to 5. An alkali metal silicate is then added to and mixed with the wood reinforcing material that has been subjected to the mineral acid deposition treatment (step 2). The alkali metal silicate is, for example, lithium silicate, potassium silicate, sodium silicate, and the like, and the alkali metal silicate may be used as a mixture of two or more kinds. There are potassium silicate and sodium silicate which are cheap and easily available. The molar ratio of the desired silicate and an alkali metal in said alkali metal silicate is Si O 2 / Na 2 O = 2~4, Si O 2 / K 2 O = 3~
4. The addition amount of the alkali metal silicate is usually 2 to 10% by weight based on the wood reinforcing material.

【０００９】〔骨材〕上記セメント系無機材料粉体と木
質補強材以外に本発明においては骨材、特に軽量骨材を
添加してもよい。上記軽量骨材としてはパーライト、シ
ラスバルーン、膨張頁岩、膨張粘土、焼成ケイ藻土、フ
ライアッシュ、石炭ガラ、発泡コンクリートの粉砕物等
の無機発泡体等が使用される。上記軽量骨材は通常成形
原料の固形分１００重量部に対して３０重量部以下で添
加される。[Aggregate] In the present invention, an aggregate, particularly a lightweight aggregate, may be added in addition to the cement-based inorganic material powder and the wood reinforcing material. As the lightweight aggregate, inorganic foams such as pearlite, shirasu balloon, expanded shale, expanded clay, calcined diatomaceous earth, fly ash, coal waste, and crushed foam concrete are used. The lightweight aggregate is usually added in an amount of 30 parts by weight or less based on 100 parts by weight of the solid content of the forming raw material.

【００１０】〔第三成分〕上記組成には所望なれば更に
硫酸カルシウム、アルミン酸塩類等の硬化促進剤やロ
ウ、ワックス、パラフィン、界面活性剤、シリコン等の
防水剤や撥水剤等が添加されてもよい。[Third component] If necessary, a curing accelerator such as calcium sulfate or aluminate, or a waterproofing agent or water repellent such as wax, wax, paraffin, surfactant or silicone may be added to the above composition. May be done.

【００１１】〔木質セメント板の製造〕本発明の木質セ
メント板を製造するには下記の半乾式法が有利に適用さ
れる。半乾式法においては、通常上記組成を所定量混合
して成形原料を調製する（工程３）。この成形原料中上
記セメント系無機材料粉体４０〜７０重量％、上記セメ
ント硬化阻害防止処理を行なった木質補強材２０〜３５
重量％程度の含有量とするのが一般的である。上記した
ように該木質補強材には所定量の水が添加混合されるこ
とによって表面部分の含水率は略均一にされている。こ
のようにして調製された成形原料を型板に散布してマッ
トをフォーミングする（工程４）。上記マットをフォー
ミングした型板は、搬送板上に一体的または別体として
載置され、通常複数段積重ねられてプレス機にセットさ
れ圧締される（工程５）。圧締圧力は通常２〜５ＭＰa
である。該マットは圧締された状態で通常５０〜１００
℃で７〜１５時間加熱硬化され、硬化後得られた木質セ
メント板は型板から離型されて通常常温で２〜４日間養
生されるか、あるいはオートクレーブ養生されて製品と
なる。木質セメント板表面に凹凸模様を付する場合に
は、該型板の型面には該凹凸模様に対応した凹凸模様を
形成しておく。また表面が凹凸模様のない平滑な木質セ
メント板を製造する場合には、型板として直接搬送板を
使用してもよい。本発明の木質セメント板は二層構造あ
るいは三層構造とされてもよい。二層構造の場合にはま
ず粒子径の細かい木質補強材が混合されている成形原料
を型板上に散布し、次いでその上に粒子径の大きい木質
補強材が混合されている成形原料を型板上に散布して二
層構造のマットを形成し、該マットを加熱圧締して上記
粒子径の細かい木質補強材を混合している成形原料によ
って緻密構造の表層部を形成し、上記粒子径の大きい木
質補強材を混合している成形原料によって粗構造の裏層
部を形成する。更に三層構造の場合には更にその上に粒
子径の細かい木質補強材が混合されている成形原料を散
布して三層構造のマットを形成し、該マットを加熱圧締
して上記粒子径の大きい木質補強材が混合されている成
形原料からなる層を芯層部とし、その上の粒子径の細か
い木質補強材が混合されている成形原料からなる層を裏
層部とする。また三層構造を形成する場合には、上記二
層構造のマットを二枚積層して加熱圧締してもよい。こ
の場合は該マットは粒子径の大きい木質繊強材が混合さ
れている成形原料からなる層相互が接触するように積層
される。[Manufacture of Wood Cement Board] The following semi-dry method is advantageously applied to manufacture the wood cement board of the present invention. In the semi-dry method, usually, a predetermined amount of the above composition is mixed to prepare a forming raw material (step 3). 40 to 70% by weight of the cement-based inorganic material powder in the molding raw material, and 20 to 35 of the wood reinforcing material subjected to the above-described cement hardening inhibition prevention treatment.
In general, the content is approximately on the order of weight%. As described above, a predetermined amount of water is added to and mixed with the wood reinforcing material, so that the water content of the surface portion is made substantially uniform. The molding material thus prepared is sprayed on a template to form a mat (step 4). The template on which the mat is formed is placed integrally or separately on a carrier plate, usually stacked in a plurality of stages, set in a press machine and clamped (step 5). Pressing pressure is usually 2-5MPa
It is. The mat is usually 50-100 when pressed.
The wood cement board obtained by heating and curing at 7 ° C. for 7 to 15 hours is released from the template and cured usually at room temperature for 2 to 4 days, or is autoclaved to obtain a product. When an uneven pattern is provided on the surface of the wood cement board, an uneven pattern corresponding to the uneven pattern is formed on the mold surface of the template. In the case of producing a smooth wood-cement board having no uneven surface, a transport board may be directly used as a template. The wood cement board of the present invention may have a two-layer structure or a three-layer structure. In the case of a two-layer structure, first, a forming raw material in which a wood reinforcing material having a fine particle diameter is mixed is sprayed on a template, and then a forming raw material in which a wood reinforcing material having a large particle diameter is mixed thereon is molded. A mat having a two-layer structure is formed by spraying on a plate, and the mat is heated and pressed to form a surface layer portion having a dense structure using a molding raw material in which a wood reinforcing material having a fine particle diameter is mixed, and the above-described particles are formed. A backing layer having a rough structure is formed by a forming raw material mixed with a wood reinforcing material having a large diameter. Further, in the case of a three-layer structure, a forming material in which a wood reinforcing material having a fine particle diameter is mixed is further sprayed thereon to form a three-layer mat, and the mat is heated and pressed to form the mat having the above-mentioned particle diameter. The layer made of the forming material in which the wood reinforcing material having a large particle size is mixed is defined as the core layer portion, and the layer formed of the forming material in which the wood reinforcing material having a small particle diameter is mixed is defined as the back layer portion. When a three-layered structure is formed, two mats having the two-layered structure may be stacked and heated and pressed. In this case, the mat is laminated so that the layers made of the forming raw material in which the woody fiber having a large particle diameter is mixed are in contact with each other.

【００１２】〔作用〕表面部分の含水率が略均一な木質
補強材に鉱酸水溶液を付着させると、該鉱酸水溶液の大
半は該木質補強材の表面付近に略均一にとどまり、この
部分において該木質補強材中に含まれる糖類は該鉱酸に
よって加水分解される。そして更にアルカリ金属ケイ酸
塩を添加混合すると、該木質補強材の表面付近に略均一
に存在している該鉱酸と該アルカリ金属ケイ酸塩との下
記のような反応によって木質補強材表面にケイ酸ゲル
（Ｓi Ｏ2 ）の皮膜が均一に形成される。 塩酸と３号ケイ酸ソーダの場合 Ｎa2Ｏ・３Ｓi Ｏ2 ＋２ＨＣl ＝２Ｎa Ｃl ＋３Ｓi Ｏ
2 ＋Ｈ2 Ｏ 硫酸と３号ケイ酸ソーダの場合 Ｎa2Ｏ・３Ｓi Ｏ2 ＋Ｈ2 ＳＯ4 ＝Ｎa2ＳＯ4 ＋３Ｓi
Ｏ2 ＋Ｈ2 Ｏ リン酸と３号ケイ酸ソーダの場合 ３（Ｎa2Ｏ・３Ｓi Ｏ2 ）＋２Ｈ3 ＰＯ4 ＝２Ｎa3ＰＯ
4 ＋９Ｓi Ｏ2 ＋３Ｈ2Ｏ このようにして形成されたケイ酸ゲル皮膜は木質補強材
中の糖類が成形原料中に溶出して来ることを確実に防止
する。また該ケイ酸ゲル皮膜はセメントの水和によって
発生するカルシウムイオンと反応してケイ酸カルシウム
ゲル皮膜となり、マットの圧締養生中に該ケイ酸カルシ
ウムゲル皮膜は硬化して木質補強材と該セメント系無機
材料硬化物との接着剤的な働きをする。[Operation] When a mineral acid aqueous solution is adhered to a wood reinforcing material having a substantially uniform moisture content in the surface portion, most of the mineral acid aqueous solution remains substantially uniformly near the surface of the wood reinforcing material. Sugars contained in the wood reinforcing material are hydrolyzed by the mineral acid. When the alkali metal silicate is further added and mixed, the reaction between the mineral acid and the alkali metal silicate, which are substantially uniformly present in the vicinity of the surface of the wood reinforcing material, is performed on the wood reinforcing material surface as follows. A silica gel (SiO 2 ) film is formed uniformly. In the case of hydrochloric acid and No. 3 sodium silicate Na 2 O · 3SiO 2 + 2HCl = 2NaCl + 3SiO
2 + H 2 O sulfuric acid and No. 3 sodium silicate Na 2 O.3SiO 2 + H 2 SO 4 = Na 2 SO 4 + 3Si
O 2 + H 2 O phosphoric acid and No. 3 sodium silicate 3 (Na 2 O.3SiO 2 ) + 2H 3 PO 4 = 2Na 3 PO
4 + 9SiO 2 + 3H 2 O The silica gel film thus formed reliably prevents the sugars in the wood reinforcing material from being eluted into the molding material. Further, the silicate gel film reacts with calcium ions generated by hydration of the cement to form a calcium silicate gel film. During the curing of the mat, the calcium silicate gel film hardens, and the wood reinforcing material and the cement are cured. Acts as an adhesive with cured inorganic materials.

【００１３】〔実施例１〜５，比較例１〜２〕表１に示
す組成を混合して成形原料を調製した。使用した木質補
強材の種類は表１に示され、そして表１に示される量の
水が添加され、次いで鉱酸およびアルカリ金属ケイ酸塩
でセメント硬化阻害防止処理が施されている。上記成形
原料は搬送板上に一体的に設けた型板上に散布され搬送
板および型板と共にプレス機にセットして表１に示す条
件で圧締加熱硬化養生を行なう。このようにして得られ
た木質セメント板の物性は表１に示される。Examples 1 to 5 and Comparative Examples 1 and 2 The compositions shown in Table 1 were mixed to prepare raw materials for molding. The type of wood reinforcement used is shown in Table 1, and the amount of water shown in Table 1 was added, followed by a mineral acid and alkali metal silicate to prevent cement setting inhibition. The molding raw material is sprayed on a template integrally provided on the carrier plate, set on a press together with the carrier plate and the mold plate, and subjected to pressurization heat curing under the conditions shown in Table 1. The physical properties of the wood cement board thus obtained are shown in Table 1.

【００１４】[0014]

【表１】 [Table 1]

【００１５】表１によれば本発明の木質セメント板（実
施例１〜５）は糖類を多量に含む樹種の木片を使用して
もセメントの硬化が円滑に行なわれ、良好な強度、寸法
安定性（吸水伸び率）を示すが、水添加処理が施されて
いない木片を使用した比較例１および２では表面のケイ
酸ゲル皮膜の形成が円滑に行なわれず不均一となり、そ
のためにセメントの硬化が起りにくい場合があり、曲げ
強度、ヤング係数、寸法安定性において不十分な結果を
みた。[0015] According to Table 1, the wood cement board of the present invention (Examples 1 to 5) can smoothly cure the cement even when a wood piece containing a large amount of sugar is used, and has good strength and dimensional stability. In Comparative Examples 1 and 2, which use wood pieces that have not been subjected to a water-adding treatment, the silicate gel film on the surface is not smoothly formed and becomes non-uniform. In some cases, and insufficient results were obtained in bending strength, Young's modulus, and dimensional stability.

【００１６】[0016]

【発明の効果】本発明では、木質補強材の少なくとも表
面部分の含水率が略均一とされているので、該木質補強
材に付着された鉱酸の大部分は該木質補強材の表面付近
に均一にとどまり、該木質補強材表面にはケイ酸ゲル皮
膜が均一に形成される。したがってセメント硬化阻害物
質である糖類を多く含む樹種から得られる木質補強材を
用いて木質セメント板を製造しても、該糖類によるセメ
ント硬化阻害の防止が確実に行なわれるから、木質スク
ラップから再生した木質補強材であっても安定して高強
度の木質セメント板を製造することが出来る。According to the present invention, since the water content of at least the surface of the wood reinforcement is substantially uniform, most of the mineral acid attached to the wood reinforcement is located near the surface of the wood reinforcement. It remains uniform, and the silica gel film is uniformly formed on the surface of the wood reinforcing material. Therefore, even if a wood cement board is manufactured using a wood reinforcing material obtained from a tree species containing a large amount of a saccharide which is a cement hardening inhibitor, since the cement hardening inhibition by the saccharide is surely performed, the wood is recycled from the wood scrap. Even with a wood reinforcing material, a high-strength wood cement board can be stably manufactured.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】水を添加して少なくとも表面部分の含水率
を略均一にした木質補強材に鉱酸水溶液を付着させる工
程１、鉱酸水溶液を付着させた該木質補強材にアルカリ
金属ケイ酸塩を添加混合することによってセメント硬化
阻害防止処理を施す工程２、セメント硬化阻害防止処理
を施した該木質補強材をセメント系無機粉体に混合して
成形原料を調製する工程３、該成形原料を型板上に散布
してマットをフォーミングする工程４、該マットを型板
と共に圧締してから養生硬化せしめる工程５、以上の工
程からなることを特徴とする木質セメント板の製造方法1. A step of adhering a mineral acid aqueous solution to a wood reinforcing material whose water content is made at least substantially uniform by adding water, wherein an alkali metal silicate is added to the wood reinforcing material to which the mineral acid aqueous solution has been adhered. Step 2 of performing a cement hardening inhibition treatment by adding and mixing a salt; Step 3 of mixing the wood reinforcing material subjected to the cement hardening inhibition prevention treatment with a cement inorganic powder to prepare a molding raw material; A step of forming a mat by spraying the mat on the template, a step 5 of pressing the mat together with the template and curing and curing the mat, and a step 5 above. 【請求項２】該木質補強材は木質スクラップから再生さ
れた再生木質補強材である請求項１に記載の木質セメン
ト板の製造方法2. The method for manufacturing a wood cement board according to claim 1, wherein said wood reinforcing material is a recycled wood reinforcing material recycled from wood scrap.
JP24982297A 1997-08-29 1997-08-29 Manufacturing method of wood cement board Expired - Fee Related JP3919892B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24982297A JP3919892B2 (en) 1997-08-29 1997-08-29 Manufacturing method of wood cement board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24982297A JP3919892B2 (en) 1997-08-29 1997-08-29 Manufacturing method of wood cement board

Publications (2)

Publication Number Publication Date
JPH1179821A true JPH1179821A (en) 1999-03-23
JP3919892B2 JP3919892B2 (en) 2007-05-30

Family

ID=17198710

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3919892B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010179196A (en) * 2009-02-03 2010-08-19 Taisei Corp Method of stabilizing waste disposal facility early

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010179196A (en) * 2009-02-03 2010-08-19 Taisei Corp Method of stabilizing waste disposal facility early

Also Published As

Publication number Publication date
JP3919892B2 (en) 2007-05-30

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