JP4550984B2 - Admixture for inorganic substrate - Google Patents

Admixture for inorganic substrate Download PDF

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Publication number
JP4550984B2
JP4550984B2 JP2000287682A JP2000287682A JP4550984B2 JP 4550984 B2 JP4550984 B2 JP 4550984B2 JP 2000287682 A JP2000287682 A JP 2000287682A JP 2000287682 A JP2000287682 A JP 2000287682A JP 4550984 B2 JP4550984 B2 JP 4550984B2
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Prior art keywords
inorganic base
base material
inorganic
resin
mixture
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JP2002097054A (en
Inventor
靖浩 堤
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KMEW Co Ltd
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Kubota Matsushitadenko Exterior Works Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

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  • Curing Cements, Concrete, And Artificial Stone (AREA)

Description

【0001】
【発明の属する技術分野】
この出願の発明は、無機質基材用混和物に関するものである。さらに詳しくは、この出願の発明は、無機質基材の廃材および塗料廃液を高配合で再利用することができて、無機質基材の強度および耐久性を損ねることなく、さらには向上させることができる無機質基材用混和物に関するものである。
【0002】
【従来の技術】
セメント板等の無機質板は、住宅等の屋根材、外壁材等の外装材等として使用されている。その製造方法としては、一般には、セメント等の水硬性材料を主成分とし、必要に応じて、ケイ石粉、珪砂等の骨材、パルプ,ロックウール等の補強繊維、フライアッシュ等の無機質充填材等を配合した水硬性スラリー原料を、抄造法、注型法、押出成形法等によって成形した後、養生して硬化させて無機質基材を製造している。この養生については、無機質基材をより緻密なものとし、後硬化による寸法変化が少ない、オートクレーブによる養生が一般に行われている。さらには、得られた無機質基材を切削あるいは切断する等して所定の寸法、形状に加工し、表面を塗料で塗装する等して化粧塗装を施し、製品としての無機質板を製造している。
【0003】
無機質基材は、上記のようなオートクレーブによる養生を行っても、養生中に変形して寸法にばらつきが生じるため、寸法、形状を一定とするには養生後の無機質基材を切削あるいは切断する必要があり、無機質基材の端材が多く発生していた。また、その無機質基材を用いた無機質板の施工現場やパネル製造工程等でも、無機質板の端材が発生していた。しかしながら、従来より、これらの端材の多くは廃材として廃棄されていた。
【0004】
【発明が解決しようとする課題】
そして近年では、上記のような廃材を粉砕し、無機質基材の水硬性スラリー原料中に固形分として5〜15%混入させることで再利用している。この廃材は、水硬性スラリー原料中に少量を配合することにより、充填材として、またオートクレーブ養生中のセメント水和反応の核となり、結晶化促進剤として機能している。しかしながら、廃材の添加量が増えるに従い、無機質基材の強度や耐久性が低下し、十分な強度および耐久性を有する無機質基材を得ることができなくなるという欠点があった。
【0005】
また、無機質基材の表面塗装は、その多くが合成樹脂塗料を、製造ラインの各種の塗装機にて自動塗装することにより行われている。その際、塗装ロス、塗装機に滞留する塗料あるいは塗料切替え時の塗装機洗浄廃液等として、合成樹脂塗料を含んだ廃液が必ずいくらか発生し、処分されていた。
【0006】
そこで、この出願の発明は、以上の通りの事情に鑑みてなされたものであり、従来技術の問題点を解消し、無機質基材の廃材および塗料廃液を高配合で再利用することができて、無機質基材の強度および耐久性を損ねることなく、さらには向上させることができる無機質基材用混和物を提供することを課題としている。
【0007】
【課題を解決するための手段】
そこで、この出願の発明は、上記の課題を解決するものとして、以下の通りの発明を提供する。
【0008】
すなわち、まず第1には、この出願の発明は、セメントを主成分としてオートクレーブ養生される無機質基材に対して使用される無機質基材用混和物であって、セメントを主成分として成形、硬化した無機質材の粉砕物に樹脂粉体を融着混合させてなる粉状体よりなることを特徴とする無機質基材用混和物を提供する。
【0009】
そして、第2には、この出願の発明は、上記第1の発明について、樹脂粉体の一部あるいは全部が、Tg≦80℃の熱可塑性樹脂よりなることを特徴とする無機質基材用混和物を、第3には、樹脂粉体の一部あるいは全部が、樹脂塗料廃液から回収された塗料樹脂よりなることを特徴とする無機質基材用混和物を、第4には、樹脂粉体の一部あるいは全部が親水性樹脂よりなることを特徴とする無機質基材用混和物を提供する。
【0010】
【発明の実施の形態】
この出願の発明は、上記の通りの特徴を持つものであるが、以下にその実施の形態について説明する。
【0011】
この出願の発明が提供する無機質基材用混和物は、セメントを主成分としてオートクレーブ養生される無機質基材に対して使用される無機質基材用混和物であって、セメントを主成分として成形、硬化した無機質材の粉砕物に樹脂粉体を融着混合させてなる粉状体よりなることを特徴としている。
【0012】
硬化後の無機質材には水硬性が失われているため、硬化後の無機質材、たとえばセメント等の粉砕物は、無機質基材の水硬性スラリー原料中に配合されることで、従来の再利用法とおなじく、充填材および結晶化促進剤として機能する。
【0013】
この出願の発明の無機質基材用混和物は、さらには、無機質材粉砕物に樹脂粉体を融着させることによって、結合材としての機能が付与される。すなわち、無機質材粉砕物に樹脂粉体を融着混合させた粉状体を水硬性スラリー原料中に配合し、粉状体が水硬性スラリー原料中の水硬性材料に囲まれた状態で成形およびオートクレーブ養生に供する。すると、粉状体中の樹脂成分が一部軟化溶融し、無機質材粉砕物と水硬性スラリー原料中の水硬性材料やフィラーとの間に浸透する。養生後には、この樹脂成分により無機質材粉砕物と無機質基材とが固結されて、無機質基材はより高い硬化を発現する。また、得られる無機質基材は、より緻密で塗膜との密着性が高められ、耐久性の高いものとなる。
【0014】
また、樹脂粉体についても、樹脂粉体を単体で配合しても水および水硬性スラリー原料になじみにくく、ダマになって均一に分散できない。そのため、この出願の発明の無機質基材用混和物においては、樹脂粉体を、親水性を有する無機質材粉砕物と融着することにより、水硬性スラリー原料中に均一に分散させるようにしている。
【0015】
この出願の発明の無機質基材用混和物は、たとえば、無機質材粉砕物を約80℃以上に加熱攪拌する中に樹脂粉体を投入し、融着混合させることで粉状体として得ることができる。無機質材粉砕物と樹脂粉体の混合割合は、70:30〜30:70程度とすることができる。
【0016】
これによって、無機質基材の強度および耐久性を損ねることなく、さらには向上させることができる無機質基材用混和物が実現される。この出願の発明の無機質基材用混和物は、無機質基材の水硬性スラリー原料中に、固形分として60〜90%程度混入することができる。また、無機質基材を抄造法により製造する場合等には、常法にしたがって、別途成形した通常の抄造シート上に、予め少量の水硬性スラリー原料と配合しておいた無機質基材用混和物を散布することで添加するなどしてもよい。
【0017】
この出願の発明の無機質基材用混和物において、樹脂粉体は、その一部あるいは全部がTg(ガラス転移点)が80℃以下の熱可塑性樹脂であることが好ましい。樹脂粉体の一部あるいは全部のTgが80℃を超えると、オートクレーブ養生中に樹脂粉体が溶融されにくく、十分な効果発現が期待できない。
【0018】
また、この出願の発明の無機質基材用混和物において、樹脂粉体の一部あるいは全部が、樹脂塗料廃液から回収された塗料樹脂であってもよい。塗料樹脂を樹脂塗料廃液から回収する方法としては、たとえば、塗料廃液を噴霧し乾燥させて塗料樹脂を粉体として回収する方法等、各種の方法が利用できる。
【0019】
樹脂粉体の一部に塗料樹脂を用いる場合には、たとえば、樹脂塗料廃液より得た塗料樹脂と樹脂粉体とを溶融混練して硬めたのち粉砕して用いたり、あるいは、予め樹脂粉体を分散させた塗料廃液を噴霧乾燥して粉体として用いること等ができる。この場合も、塗料樹脂のTgは、80℃以下であることが望ましい。
【0020】
加えて、この出願の発明の無機質基材用混和物において、樹脂粉体の一部あるいは全部が水溶性樹脂、水系エマルジョン樹脂等の親水性樹脂であると、より水硬性スラリー原料への混和が容易となり、好ましい。
【0021】
この出願の発明の無機質基材用混和物を用いて無機質基材を製造する方法について、成型法として抄造法を利用する場合を例に説明する。
無機質基材の原料として、たとえば、普通ポルトランドセメント、ケイ石粉、珪砂、パルプ、ロックウール、フライアッシュ、水等を用い、これらを配合した水硬性スラリー原料を抄造法により成形して湿潤状態の抄造シートを作製する。
一方で、この出願の発明の無機質基材用混和物、普通ポルトランドセメント、ケイ石粉、珪砂、水等よりなる散布スラリーを調製し、湿潤状態の抄造シート上に散布する。この散布スラリーを散布した抄造シートを脱水し、プレス機による脱水プレス成形等を行い、自然養生した後、オートクレーブに入れて170℃程度で養生させる。これによって、この出願の発明の無機質基材用混和物を混入させた無機質基材を得ることができる。得られた無機質基材は、切断、切削、塗装等の所望の工程を施すことができる。
【0022】
もちろん、無機質基材の製造において、この出願の発明の無機質基材用混和物を水硬性スラリー原料に混和して、注型法、押出成形法等の各種の成形方法により成形するなどしてもよい。
【0023】
以下、実施例を示し、この発明の実施の形態についてさらに詳しく説明する。
【0024】
【実施例】
(実施例1)
普通ポルトランドセメント45重量%、珪砂20重量%、ケイ石粉25重量%、パルプ10重量%の配合で、固形分濃度を45重量%とした水性スラリーを抄造し、湿潤な抄造シートを作製した。
【0025】
この抄造シートを固形分濃度70重量%にまで脱水する途中の抄造シートに、下記に示す散布用水性スラリーAを散布した。
水性スラリー散布後の抄造シートをプレス脱水成形して成形体とし、80℃で一次養生、次いで170℃でオートクレーブ養生した。養生後の成形体には、アクリルクリア塗装による化粧塗装を施し、化粧無機質板Aを得た。
【0026】
なお、散布用水性スラリーAは、以下のように作製した。
まず、熱硬化性樹脂であるビスフェノールA型エポキシ樹脂(エピコート1009;油化シェルエポキシ社製)とフェノール系硬化剤、顔料(前記樹脂に対して30重量%)を80〜100℃で溶融混合した後冷却し、平均粒径60ミクロンにまで粉砕して、樹脂粉体とした。
【0027】
次に、硬化セメント粉砕物70重量%を80℃以上に加熱攪拌しながら、上記樹脂粉体を30重量%加え、粉体状の無機質材混和物とした。
そして上記の無機質材混和物60重量%,普通ポルトランドセメント20重量%,ケイ石粉20重量%、および水を混合し、散布用水性スラリーAとした。
(実施例2)
実施例1において、散布用水性スラリーAの代わりに、下記の散布用水性スラリーBを用いて化粧無機質板Bを得た。
【0028】
散布用水性スラリーBは、以下のように作製した。
まず、硬化セメント粉砕物30重量%を80℃以上に加熱攪拌した中に、アクリルエマルジョン塗料より回収した塗料樹脂(Tg=40℃、固形分10%)を30重量%加え、粉体状の無機質材混和物とした。
【0029】
次に、上記の無機質材混和物90重量%と、実施例1と同じ樹脂粉体10重量%および水を混合し、散布用水性スラリーBとした。
(比較例1)
実施例1において、散布用水性スラリーAの代わりに、下記の散布用水性スラリーCを用いて化粧無機質板Cを得た。
【0030】
散布用水性スラリーCは、以下のように作製した。
アクリルスチレンエマルジョン樹脂15重量%(固形分)、普通ポルトランドセメント40重量%、ケイ石粉40重量%、カーボンブラック5重量%および水を混合し、散布用水性スラリーCとした。
(比較例2)
実施例1において、抄造シートに水性スラリーの散布を行なわずに一次養生し、アクリル系シーラー塗料を塗布してから、オートクレーブ養生して化粧無機質板Dを得た。
【0031】
以上の実施例1、2および比較例1、2で得られた化粧無機質板A〜Dについて強度試験を行なった結果、化粧無機質板Aの強度は化粧無機質板Cよりも高く、化粧無機質板Bについては同程度であった。化粧無機質板Dは、いずれのものよりも強度が低かった。
【0032】
さらに、実施例1、2および比較例1、2における、化粧無機質板A〜Dの成形時の作業性、破断面における樹脂の浸透封止性(耐水性)、化粧塗膜との耐久密着性(塗膜密着性)を評価し、その結果を表1にまとめた。
【0033】
【表1】

Figure 0004550984
【0034】
実施例1および2では、化粧無機質板の成形時の作業性もよく、耐水性および塗膜密着性に優れた化粧無機質板A,Bが得られた。
これによって、この出願の発明の無機質基材用混和物は、無機質基材中に多量に混和させても、無機質基材の強度および耐久性を損ねることなく、さらには向上させることが示された。
【0035】
一方の比較例1では、抄造シートのプレス成形時に成形体が金型に付着するなどし、成形時の作業性は悪かった。金型に離型油を塗布した場合でも、作業性は改善されなかった。これは、散布用水性スラリーCに配合されているアクリルスチレンエマルジョン樹脂により抄造水が汚染されたため、抄造速度が低下してしまったことによるものと推察される。また、得られた化粧無機質板Cについては、耐水性は良いが、塗膜密着性が悪かった。
【0036】
比較例2では、抄造シートのプレス成形時に成形体が金型に付着するなどし、成形時の作業性は悪かった。比較例2の場合は、金型に離型油を塗布することで作業性は改善された。しかしながら、得られた化粧無機質板Dは、耐水性および塗膜密着性ともに劣っていた。
【0037】
もちろん、この発明は以上の例に限定されるものではなく、細部については様々な態様が可能であることは言うまでもない。
【0038】
【発明の効果】
以上詳しく説明した通り、この発明によって、無機質基材の廃材および塗料廃液を高配合で再利用することができて、無機質基材の強度および耐久性を損ねることなく、さらには向上させることができる無機質基材用混和物が提供される。[0001]
BACKGROUND OF THE INVENTION
The invention of this application relates to an admixture for an inorganic substrate. More specifically, the invention of this application can recycle the waste material of the inorganic base material and the paint waste liquid with high blending, and can further improve without impairing the strength and durability of the inorganic base material. The present invention relates to a mixture for an inorganic substrate.
[0002]
[Prior art]
Inorganic boards such as cement boards are used as exterior materials such as roofing materials for houses, outer wall materials, and the like. As a manufacturing method thereof, generally, a hydraulic material such as cement is a main component, and aggregates such as quartzite powder and silica sand, reinforcing fibers such as pulp and rock wool, and inorganic fillers such as fly ash are necessary. After forming a hydraulic slurry raw material blended with a papermaking method, a casting method, an extrusion molding method or the like, it is cured and cured to produce an inorganic base material. As for this curing, curing by an autoclave is generally performed in which the inorganic base material is made denser and the dimensional change due to post-curing is small. Furthermore, the resulting inorganic base material is processed into predetermined dimensions and shapes by cutting or cutting, etc., and the surface is painted with a paint, etc., and a decorative coating is applied to produce an inorganic board as a product. .
[0003]
Even if the inorganic base material is cured by the autoclave as described above, it deforms during the curing and causes variations in dimensions. Therefore, to keep the size and shape constant, the inorganic base material after cutting is cut or cut. It was necessary, and many scraps of the inorganic base material were generated. Moreover, the edge material of the inorganic board has generate | occur | produced also in the construction site of the inorganic board using the inorganic base material, a panel manufacturing process, etc. However, conventionally, many of these mill ends have been discarded as waste materials.
[0004]
[Problems to be solved by the invention]
In recent years, waste materials such as those described above are pulverized and reused by mixing 5-15% as solids in the hydraulic slurry raw material of the inorganic base material. By mixing a small amount of this waste material in the hydraulic slurry raw material, it serves as a filler and as a core of cement hydration reaction during autoclave curing and functions as a crystallization accelerator. However, as the amount of waste material added increases, the strength and durability of the inorganic base material decrease, and there is a drawback in that it is impossible to obtain an inorganic base material having sufficient strength and durability.
[0005]
Moreover, most of the surface coating of the inorganic base material is performed by automatically applying a synthetic resin paint with various coating machines on the production line. At that time, some waste liquid containing synthetic resin paint was always generated and disposed of as paint loss, paint staying in the paint machine, or paint machine washing waste liquid at the time of paint switching.
[0006]
Therefore, the invention of this application has been made in view of the circumstances as described above, solves the problems of the prior art, and can recycle waste materials of inorganic base materials and paint waste liquids with high blending. An object of the present invention is to provide an inorganic base material mixture that can be further improved without impairing the strength and durability of the inorganic base material.
[0007]
[Means for Solving the Problems]
Therefore, the invention of this application provides the following invention as a solution to the above-mentioned problems.
[0008]
That is, first of all, the invention of this application is an inorganic base material mixture used for an inorganic base material cured by autoclaving with cement as a main component, and molded and hardened with cement as a main component. Provided is an inorganic base material mixture comprising a powdery product obtained by fusing and mixing a resin powder to a pulverized product of an inorganic material.
[0009]
Secondly, the invention of this application relates to the first invention, wherein a part or all of the resin powder is made of a thermoplastic resin having a Tg ≦ 80 ° C. Thirdly, an inorganic base material admixture characterized in that a part or all of the resin powder is made of a paint resin recovered from the resin paint waste liquid, and fourth, a resin powder. A mixture for an inorganic base material is provided in which a part or all of is made of a hydrophilic resin.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The invention of this application has the features as described above, and an embodiment thereof will be described below.
[0011]
The mixture for inorganic base material provided by the invention of this application is an inorganic base material mixture used for an inorganic base material cured by autoclaving with cement as a main component, and molded with cement as a main component, It is characterized by comprising a powdery material obtained by fusing and mixing resin powder to a ground product of a cured inorganic material.
[0012]
Since the inorganic material after curing has lost hydraulic properties, the inorganic material after curing, for example, pulverized material such as cement, is blended in the hydraulic slurry raw material of the inorganic base material, so that it can be reused in the past. Similar to the method, it functions as a filler and crystallization accelerator.
[0013]
The blend for inorganic substrates of the invention of this application is further given a function as a binder by fusing resin powder to the pulverized inorganic material. That is, a powdery material obtained by fusing and mixing resin powder to a pulverized inorganic material is blended in a hydraulic slurry raw material, and the powdery material is molded and surrounded by the hydraulic material in the hydraulic slurry raw material. Use for autoclave curing. Then, a part of the resin component in the powder is softened and melted and penetrates between the pulverized inorganic material and the hydraulic material or filler in the hydraulic slurry raw material. After curing, the pulverized inorganic material and the inorganic base material are consolidated by this resin component, and the inorganic base material develops higher curing. Moreover, the obtained inorganic base material is denser, has improved adhesion to the coating film, and has high durability.
[0014]
In addition, even if the resin powder is blended alone, the resin powder is difficult to adapt to water and the hydraulic slurry raw material and cannot be uniformly dispersed. Therefore, in the mixture for inorganic substrates of the invention of this application, the resin powder is uniformly dispersed in the hydraulic slurry raw material by fusing with the pulverized inorganic material having hydrophilicity. .
[0015]
The admixture for inorganic base material of the invention of this application can be obtained as a powdery material by, for example, adding resin powder and stirring and mixing the pulverized inorganic material to about 80 ° C. or higher. it can. The mixing ratio of the pulverized inorganic material and the resin powder can be about 70:30 to 30:70.
[0016]
Thus, an inorganic base material mixture that can be further improved without impairing the strength and durability of the inorganic base material is realized. The mixture for inorganic base material of the invention of this application can be mixed in the hydraulic slurry raw material of the inorganic base material by about 60 to 90% as a solid content. In addition, when an inorganic base material is produced by a papermaking method, etc., an inorganic base material admixture previously mixed with a small amount of a hydraulic slurry raw material on a normal papermaking sheet separately formed according to a conventional method. It may be added by spraying.
[0017]
In the mixture for inorganic substrates of the invention of this application, the resin powder is preferably a thermoplastic resin having a part or all of Tg (glass transition point) of 80 ° C. or less. If the Tg of a part or all of the resin powder exceeds 80 ° C., the resin powder is hardly melted during autoclave curing, and sufficient effects cannot be expected.
[0018]
Further, in the mixture for inorganic base material of the invention of this application, a part or all of the resin powder may be a paint resin recovered from a resin paint waste liquid. As a method for recovering the paint resin from the resin paint waste liquid, various methods such as a method for recovering the paint resin as powder by spraying and drying the paint waste liquid can be used.
[0019]
When a coating resin is used for a part of the resin powder, for example, the coating resin obtained from the resin coating waste liquid and the resin powder are melted and kneaded and then pulverized, or used in advance. The paint waste liquid in which is dispersed can be spray-dried and used as a powder. Also in this case, the Tg of the coating resin is desirably 80 ° C. or less.
[0020]
In addition, in the admixture for inorganic base material of the invention of this application, if a part or all of the resin powder is a hydrophilic resin such as a water-soluble resin or an aqueous emulsion resin, the mixture into the hydraulic slurry raw material is further improved. It is easy and preferable.
[0021]
The method for producing an inorganic base material using the mixture for inorganic base material of the invention of this application will be described by taking as an example the case of using a papermaking method as a molding method.
For example, ordinary Portland cement, quartzite powder, silica sand, pulp, rock wool, fly ash, water, etc. are used as the raw material for the inorganic base material. A sheet is produced.
On the other hand, a dispersion slurry made of the inorganic base material admixture of the invention of this application, ordinary Portland cement, quartzite powder, silica sand, water and the like is prepared and dispersed on a wet paper sheet. The papermaking sheet sprayed with the sprayed slurry is dehydrated, subjected to dehydration press molding with a press machine, naturally cured, and then placed in an autoclave and cured at about 170 ° C. Thereby, an inorganic base material mixed with the mixture for inorganic base material of the invention of this application can be obtained. The obtained inorganic substrate can be subjected to desired processes such as cutting, cutting, and painting.
[0022]
Of course, in the production of the inorganic base material, the mixture for inorganic base material of the invention of this application may be mixed with the hydraulic slurry raw material and molded by various molding methods such as casting and extrusion molding. Good.
[0023]
Hereinafter, examples will be shown, and the embodiments of the present invention will be described in more detail.
[0024]
【Example】
Example 1
An aqueous slurry having a solid content of 45% by weight was prepared by blending 45% by weight of ordinary Portland cement, 20% by weight of silica sand, 25% by weight of quartzite powder, and 10% by weight of pulp to prepare a wet paper sheet.
[0025]
An aqueous slurry A for spraying shown below was sprayed on the paper sheet in the process of dehydrating the paper sheet to a solid content concentration of 70% by weight.
The papermaking sheet after spraying the aqueous slurry was press-dehydrated to form a molded body, which was subjected to primary curing at 80 ° C. and then autoclave curing at 170 ° C. The molded body after curing was subjected to a cosmetic coating by acrylic clear coating to obtain a decorative inorganic board A.
[0026]
The spraying aqueous slurry A was prepared as follows.
First, a thermosetting resin bisphenol A type epoxy resin (Epicoat 1009; manufactured by Yuka Shell Epoxy Co., Ltd.), a phenolic curing agent and a pigment (30% by weight with respect to the resin) were melt-mixed at 80 to 100 ° C. After cooling, it was pulverized to an average particle size of 60 microns to obtain a resin powder.
[0027]
Next, 30% by weight of the resin powder was added while heating and stirring 70% by weight of the hardened cement pulverized product at 80 ° C. or more to obtain a powdery inorganic material mixture.
And 60 weight% of said inorganic material mixture, 20 weight% of normal Portland cement, 20 weight% of silica powder, and water were mixed, and it was set as the aqueous slurry A for dispersion | spreading.
(Example 2)
In Example 1, instead of the spraying aqueous slurry A, a cosmetic mineral board B was obtained using the following spraying aqueous slurry B.
[0028]
The spraying aqueous slurry B was prepared as follows.
First, 30% by weight of a hardened cement pulverized product was heated and stirred at 80 ° C. or higher, and 30% by weight of a coating resin (Tg = 40 ° C., solid content 10%) recovered from an acrylic emulsion paint was added. A mixture of materials was used.
[0029]
Next, 90% by weight of the above inorganic material mixture, 10% by weight of the same resin powder as in Example 1, and water were mixed to obtain an aqueous slurry B for spraying.
(Comparative Example 1)
In Example 1, instead of the spraying aqueous slurry A, a decorative inorganic board C was obtained using the following spraying aqueous slurry C.
[0030]
The spraying aqueous slurry C was prepared as follows.
Acrylic styrene emulsion resin 15% by weight (solid content), ordinary Portland cement 40% by weight, quartzite powder 40% by weight, carbon black 5% by weight and water were mixed to obtain an aqueous slurry C for spraying.
(Comparative Example 2)
In Example 1, the paper sheet was primarily cured without spraying the aqueous slurry, applied with an acrylic sealer paint, and then autoclaved to obtain a decorative inorganic board D.
[0031]
As a result of conducting a strength test on the decorative inorganic plates A to D obtained in Examples 1 and 2 and Comparative Examples 1 and 2, the strength of the decorative inorganic plate A was higher than that of the decorative inorganic plate C, and the decorative inorganic plate B About the same. The decorative inorganic board D was lower in strength than any of them.
[0032]
Furthermore, in Examples 1 and 2 and Comparative Examples 1 and 2, the workability during molding of the decorative inorganic plates A to D, the permeation sealing property (water resistance) of the resin at the fracture surface, and the durable adhesion to the decorative coating film (Coating film adhesion) was evaluated, and the results are summarized in Table 1.
[0033]
[Table 1]
Figure 0004550984
[0034]
In Examples 1 and 2, cosmetic inorganic boards A and B having excellent workability during molding of the decorative inorganic board and excellent water resistance and coating film adhesion were obtained.
As a result, it was shown that the mixture for inorganic base material of the invention of this application can be further improved without impairing the strength and durability of the inorganic base material even when mixed in a large amount in the inorganic base material. .
[0035]
On the other hand, in Comparative Example 1, the molded product adhered to the mold during press molding of the paper sheet, and the workability during molding was poor. Even when release oil was applied to the mold, workability was not improved. This is presumably due to the fact that the papermaking speed was reduced because the papermaking water was contaminated by the acrylic styrene emulsion resin blended in the aqueous slurry C for spraying. Moreover, about the obtained decorative inorganic board C, although water resistance was good, the coating-film adhesiveness was bad.
[0036]
In Comparative Example 2, the workability at the time of forming was poor because the formed body adhered to the mold during press forming of the paper sheet. In the case of Comparative Example 2, workability was improved by applying release oil to the mold. However, the obtained decorative inorganic board D was inferior in both water resistance and coating film adhesion.
[0037]
Of course, the present invention is not limited to the above examples, and it goes without saying that various aspects are possible in detail.
[0038]
【The invention's effect】
As described above in detail, according to the present invention, the waste material of the inorganic base material and the paint waste liquid can be reused with high blending, and can be further improved without impairing the strength and durability of the inorganic base material. An inorganic substrate blend is provided.

Claims (4)

セメントを主成分としてオートクレーブ養生される無機質基材に対して使用される無機質基材用混和物であって、セメントを主成分として成形、硬化した無機質材の粉砕物に樹脂粉体を融着混合させてなる粉状体よりなることを特徴とする無機質基材用混和物。 A mixture for inorganic base materials used for inorganic base materials cured by autoclaving with cement as the main component, and resin powder fused and mixed with the pulverized inorganic material molded and hardened with cement as the main component A mixture for an inorganic base material, characterized by comprising a powdery body. 樹脂粉体の一部あるいは全部が、Tg≦80℃の熱可塑性樹脂よりなることを特徴とする請求項1記載の無機質基材用混和物。  2. The mixture for inorganic base material according to claim 1, wherein a part or all of the resin powder is made of a thermoplastic resin having a Tg ≦ 80 ° C. 樹脂粉体の一部あるいは全部が、樹脂塗料廃液から回収された塗料樹脂よりなることを特徴とする請求項1または2記載の無機質基材用混和物。  The mixture for inorganic base material according to claim 1 or 2, wherein a part or all of the resin powder is made of a paint resin recovered from a resin paint waste liquid. 樹脂粉体の一部あるいは全部が親水性樹脂よりなることを特徴とする請求項1ないし3いずれかに記載の無機質基材用混和物。  4. The mixture for inorganic base material according to claim 1, wherein a part or all of the resin powder is made of a hydrophilic resin.
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JPH09255386A (en) * 1996-03-22 1997-09-30 Chichibu Onoda Cement Corp Improved aggregate and its production

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JPS5371125A (en) * 1976-12-07 1978-06-24 Toda Construction Method for production of mixturs or aggregate
JPS53126028A (en) * 1977-04-12 1978-11-02 Yoshimasa Matsunaga Method for regenerative treatment of concrete waste
JP2870567B2 (en) * 1993-05-07 1999-03-17 株式会社クボタ Method for producing inorganic building material having improved strength and low water absorption
JPH09241054A (en) * 1996-03-06 1997-09-16 Tekken Constr Co Ltd Regenerated concrete aggregate and its treatment
JPH1192204A (en) * 1997-09-16 1999-04-06 Honda Motor Co Ltd Molding for molded product utilizing coating waste and system therefor
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