JP6341952B2 - Gypsum board and method for producing gypsum board - Google Patents
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- 229910052602 gypsum Inorganic materials 0.000 title claims description 113
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 239000011398 Portland cement Substances 0.000 claims description 35
- 239000002002 slurry Substances 0.000 claims description 27
- 229920002472 Starch Polymers 0.000 claims description 25
- 239000008107 starch Substances 0.000 claims description 24
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- 238000000034 method Methods 0.000 claims description 10
- 229940121375 antifungal agent Drugs 0.000 claims description 7
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Description
本発明は、石膏部材、石膏ボード及び石膏部材の製造方法に関する。 The present invention relates to a gypsum member, a gypsum board, and a method for manufacturing a gypsum member.
石膏を主成分とする石膏ボード等の石膏部材は、耐火性、断熱性、遮音性等に優れており、建材等として広く用いられている。例えば、特許文献１には、建築物の外壁の下地に利用される石膏ボードが開示されている。また、特許文献２には、エレベーターシャフト内で利用される石膏ボードが開示されている。
Gypsum members such as gypsum board mainly composed of gypsum are excellent in fire resistance, heat insulation, sound insulation, and the like, and are widely used as building materials and the like. For example, Patent Document 1 discloses a gypsum board that is used as a base of an outer wall of a building.
この種の石膏ボードは、通常の石膏ボードと比べて、湿気の多い環境下で使用されるため、カビの発生を防止又は抑制すること（いわゆる、防カビ性）が求められている。そのため、従来、この種の石膏ボードを構成する芯材や、芯材に積層される原紙には防カビ剤が付与されている（特許文献１，２参照）。例えば、特許文献２には、イミダゾール系、チアゾリン系、クロロフェノール系等の有機系の防カビ剤が開示されている。
Since this type of gypsum board is used in a humid environment compared to a normal gypsum board, it is required to prevent or suppress the generation of mold (so-called mold resistance). Therefore, conventionally, an antifungal agent is applied to the core material constituting this type of gypsum board and the base paper laminated on the core material (see Patent Documents 1 and 2). For example,
石膏部材に利用される防カビ剤は、防カビ性に優れるものの、一般的に高価であり、石膏部材の製造コストを高くする一因となっていた。 Antifungal agents used in gypsum members are excellent in antifungal properties, but are generally expensive and contribute to increase the production cost of gypsum members.
本発明の目的は、一般的な防カビ剤を使用せずに、石膏部材及び石膏ボードに防カビ性を付与する技術を提供することである。 An object of the present invention is to provide a technique for imparting antifungal properties to a gypsum member and a gypsum board without using a general antifungal agent.
本発明に係る石膏部材は、焼石膏、及び水を含有するスラリーを硬化させたものからなる石膏部材であって、前記スラリーは、ポルトランドセメントを含有し、前記ポルトランドセメントの含有量が、前記焼石膏１００質量部当たり、０．１〜１０．０質量部であることを特徴とする。 The gypsum member according to the present invention is a gypsum member made by curing a slurry containing calcined gypsum and water, wherein the slurry contains Portland cement, and the content of the Portland cement is the calcined gypsum. It is characterized by 0.1 to 10.0 parts by mass per 100 parts by mass of gypsum.
前記石膏部材において、前記ポルトランドセメントの含有量が、前記焼石膏１００質量部当たり、０．１〜１．０質量部であることが好ましい。 In the gypsum member, the content of the Portland cement is preferably 0.1 to 1.0 part by mass per 100 parts by mass of the calcined gypsum.
前記石膏部材において、前記スラリーは、デンプンを含有し、前記デンプンの含有量が、前記焼石膏１００質量部当たり、０．３〜２．４質量部であり、前記ポルトランドセメントの含有量が、前記焼石膏１００質量部当たり、０．２５質量部以上であることが好ましい。 In the gypsum member, the slurry contains starch, the starch content is 0.3 to 2.4 parts by mass per 100 parts by mass of the calcined gypsum, and the Portland cement content is It is preferable that it is 0.25 mass part or more per 100 mass parts of calcined gypsum.
また、本発明の石膏ボードは、前記何れかに記載の石膏部材からなり、ボード状をなした芯材と、この芯材の両面に貼り付けられる一対のボード用原紙とを備える。 Moreover, the gypsum board of this invention consists of a gypsum member in any one of the said, and is provided with the core material which made the board shape, and a pair of base paper for boards affixed on both surfaces of this core material.
前記石膏ボードにおいて、前記ボード用原紙の表面に形成され、クロス用糊が５０〜４００ｇ／ｍ２の割合で塗布されてなる糊層を備えてもよい。 The gypsum board may include a glue layer formed on the surface of the board base paper and coated with a cloth glue at a rate of 50 to 400 g / m 2 .
また、本発明に係る石膏部材の製造方法は、焼石膏、及び水を含有するスラリーを硬化させて石膏部材を製造する石膏部材の製造方法であって、前記スラリーに、ポルトランドセメントを、前記焼石膏１００質量部当たり、０．１〜１０．０質量部の割合で、添加する工程を有することを特徴とする。 The method for producing a gypsum member according to the present invention is a method for producing a gypsum member by curing a slurry containing calcined gypsum and water, wherein Portland cement is added to the slurry. It has the process of adding in the ratio of 0.1-10.0 mass part per 100 mass parts of gypsum, It is characterized by the above-mentioned.
前記石膏部材の製造方法において、前記添加工程では、前記スラリーに、前記ポルトランドセメントを、前記焼石膏１００質量部当たり、０．１〜１．０質量部の割合で添加することが好ましい。 In the method for producing a gypsum member, in the adding step, the Portland cement is preferably added to the slurry at a ratio of 0.1 to 1.0 part by mass per 100 parts by mass of the calcined gypsum.
前記石膏部材の製造方法において、前記添加工程では、前記スラリーに、デンプンを、前記焼石膏１００質量部当たり、０．３〜２．４質量部の割合で添加し、かつ前記ポルトランドセメントを、前記焼石膏１００質量部当たり、０．２５質量部以上の割合で添加することが好ましい。 In the method for producing a gypsum member, in the adding step, starch is added to the slurry at a ratio of 0.3 to 2.4 parts by mass per 100 parts by mass of the calcined gypsum, and the Portland cement is added to the slurry. It is preferable to add at a rate of 0.25 parts by mass or more per 100 parts by mass of calcined gypsum.
本発明によれば、一般的な防カビ剤を使用せずに、石膏部材及び石膏ボードに防カビ性を付与することができる。 ADVANTAGE OF THE INVENTION According to this invention, antifungal property can be provided to a gypsum member and a gypsum board, without using a general antifungal agent.
〔石膏部材〕
本発明の石膏部材は、焼石膏（ＣａＳＯ４・１／２Ｈ２０）、水、及びポルトランドセメントを少なくとも含有するスラリーを硬化させたもの（硬化体）からなり、二水石膏（ＣａＳＯ４・２Ｈ２０）を主成分とする。
[Gypsum materials]
Gypsum member of the present invention, calcined gypsum (CaSO 4 · 1 / 2H 2 0), water, and those obtained by curing a slurry containing at least Portland cement consists (cured body), gypsum (CaSO 4 · 2H 20 ) is the main component.
石膏部材は、内装建材（例えば、天井材、床材、壁材、外壁等の下地材）等の様々な用途で用いられ、特に、厨房等の多湿環境になり易い箇所で好適に用いられる。石膏部材の外観形状は、特に制限はなく、目的に応じて適宜、設定されればよい。石膏部材は、例えば、図１に示されるような、石膏ボード１のボード状の芯材２に利用される。なお、芯材２の両面には、ボード用原紙３，４が積層されている。
The gypsum member is used in various applications such as interior building materials (for example, base materials such as ceiling materials, floor materials, wall materials, and outer walls), and is particularly preferably used in a place that tends to be in a humid environment such as a kitchen. There is no restriction | limiting in particular in the external appearance shape of a gypsum member, What is necessary is just to set suitably according to the objective. The gypsum member is used for, for example, a board-
石膏部材を製造するために利用される焼石膏（半水石膏）の原材料としては、天然石膏や、各種の化学石膏（例えば、リン酸石膏、排煙脱硫石膏、チタン石膏、フッ酸石膏、製塩石膏、精錬石膏等）を使用することができる。 Raw materials for calcined gypsum (half-water gypsum) used to manufacture gypsum components include natural gypsum and various chemical gypsum (for example, phosphate gypsum, flue gas desulfurization gypsum, titanium gypsum, hydrofluoric gypsum, salt production Gypsum, refined gypsum, etc.) can be used.
本発明では、石膏部材中に、少量のポルトランドセメントが添加されることで、石膏部材に防カビ性能が付与される。 In the present invention, antifungal performance is imparted to the gypsum member by adding a small amount of Portland cement to the gypsum member.
ポルトランドセメントとしては、本発明の目的を損なわない限り、特に制限はなく、例えば、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント、低熱ポルトランドセメント、耐硫酸塩ポルトランドセメント等の各種のポルトランドセメントが挙げられる。なお、コスト、入手容易性等の観点より、ポルトランドセメントとしては、普通ポルトランドセメントが好ましい。 The Portland cement is not particularly limited as long as it does not impair the object of the present invention. And various Portland cements. In addition, from the viewpoints of cost, availability and the like, ordinary Portland cement is preferable as Portland cement.
ポルトランドセメントの含有量（含有割合）は、石膏部材を製造するためのスラリー中に含まれる焼石膏１００質量部当たり、０．１〜１０．０質量部である。ポルトランドセメントの含有量がこのような範囲であると、石膏部材の防カビ性が確保される。 The content (content ratio) of Portland cement is 0.1 to 10.0 parts by mass per 100 parts by mass of calcined gypsum contained in the slurry for producing a gypsum member. When the content of Portland cement is within such a range, the mold prevention property of the gypsum member is ensured.
なお、ポルトランドセメントの含有量（含有割合）としては、石膏部材を製造するためのスラリー中に含まれる焼石膏１００質量部当たり、０．１〜１．０質量部であることが好ましい。ポルトランドセメントの含有量がこのような範囲であると、石膏部材の防カビ性が確保されると共に、石膏部材が略中性（例えば、ｐＨ５．８〜ｐＨ８．６）となり、石膏部材に貼り付けられる原紙等が石膏部材中に含まれる成分によって腐食すること等が抑制される。 In addition, as content (content ratio) of Portland cement, it is preferable that it is 0.1-1.0 mass part per 100 mass parts of calcined gypsum contained in the slurry for manufacturing a gypsum member. When the content of Portland cement is in such a range, the gypsum member is protected against mold and the gypsum member becomes substantially neutral (for example, pH 5.8 to pH 8.6) and is attached to the gypsum member. Corrosion of the base paper or the like that is corroded by components contained in the gypsum member is suppressed.
また、ポルトランドセメントの含有量（含有割合）としては、石膏部材を製造するためのスラリー中に含まれる焼石膏１００質量部当たり、０．２５質量部以上（０．２５〜）が好ましい。ポルトランドセメントの含有量がこのような範囲であると、後述するように、石膏部材中にデンプンが含まれる場合であっても、デンプンの含有量が、前記スラリー中に含まれる焼石膏１００質量部当たり、０．３〜２．４質量部であれば、石膏部材の防カビ性が確保される。 Moreover, as content (content ratio) of Portland cement, 0.25 mass part or more (0.25) is preferable per 100 mass parts of calcined gypsum contained in the slurry for manufacturing a gypsum member. When the content of Portland cement is within such a range, as will be described later, even if the gypsum member contains starch, the content of starch is 100 parts by mass of calcined gypsum contained in the slurry. If the hit is 0.3 to 2.4 parts by mass, the mold resistance of the gypsum member is ensured.
（添加剤）
なお、本発明の目的を損なわない限り、石膏部材を製造するためのスラリーに、焼石膏、水、ポルトランドセメント以外のその他の成分（添加剤）が添加されてもよい。具体的な添加剤としては、例えば、デンプンが挙げられる。デンプンとしては、例えば、コーンスターチ、馬鈴薯デンプン、小麦デンプン、米デンプン、タピオカデンプン、サゴデンプン、化工デンプン等が挙げられる。
(Additive)
In addition, unless the objective of this invention is impaired, other components (additive) other than calcined gypsum, water, and Portland cement may be added to the slurry for manufacturing a gypsum member. Specific examples of the additive include starch. Examples of the starch include corn starch, potato starch, wheat starch, rice starch, tapioca starch, sago starch, and modified starch.
デンプンの含有量は、本発明の目的を損なわない限り、特に制限はないが、例えば、石膏部材を製造するためのスラリー中に含まれる焼石膏１００質量部当たり、０．３〜２．４質量部が好ましい。デンプンの含有量がこのような範囲であると、ポルトランドセメントの含有量が、スラリー中に含まれる焼石膏１００質量部当たり、０．２５質量部以上であれば、防カビ性を確保することができる。デンプンは、カビ等の菌類の栄養源となり得るものの、石膏部材中に少量のポルトランドセメントが添加されているだけで、石膏部材の防カビ性が確保される。 The content of starch is not particularly limited as long as the object of the present invention is not impaired, but, for example, 0.3 to 2.4 mass per 100 mass parts of calcined gypsum contained in a slurry for producing a gypsum member. Part is preferred. If the content of the starch is in such a range, if the content of the Portland cement is 0.25 parts by mass or more per 100 parts by mass of calcined gypsum contained in the slurry, it is possible to ensure antifungal properties. it can. Although starch can serve as a nutrient source for fungi such as mold, the anti-mold property of the gypsum member is ensured only by adding a small amount of Portland cement into the gypsum member.
他の添加剤としては、例えば、界面活性剤、有機質繊維（アクリル繊維、ビニロン繊維等）、無機質繊維（ガラス繊維、カーボン繊維等）、ＰＶＡ（ポリビニルアルコール）、メチルセルロース、無機軽量骨材（パーライト、シラスバルーン、バーミキュライト、ガラスバルーン等）、耐水剤、酸化防止剤、紫外線吸収剤、着色剤（顔料、染料）、酒石酸塩（酒石酸カリウム、酒石酸水素カリウム、及び酒石酸ナトリウムカリウム四水和物等）、ホルマリンキャッチャー剤等が挙げられる。これらは単独で又は２種以上を組み合わせて使用されてもよい。 Examples of other additives include surfactants, organic fibers (acrylic fibers, vinylon fibers, etc.), inorganic fibers (glass fibers, carbon fibers, etc.), PVA (polyvinyl alcohol), methylcellulose, inorganic lightweight aggregates (perlite, Shirasu balloon, vermiculite, glass balloon, etc.), water resistant agent, antioxidant, ultraviolet absorber, colorant (pigment, dye), tartrate (potassium tartrate, potassium hydrogen tartrate, sodium potassium tartrate tetrahydrate, etc.), Formalin catcher agent and the like. These may be used alone or in combination of two or more.
石膏部材の製造方法としては、成型工程、乾燥工程、仕上工程等を含む公知の方法を適用することができる。 As a method for producing a gypsum member, a known method including a molding process, a drying process, a finishing process, and the like can be applied.
また、本発明の場合、石膏ボードの表面（片面、又は両面）に、クロスを貼り付ける際、クロス用糊の塗布量が、通常の使用量（例えば、４００ｇ／ｍ２以下）であれば、石膏ボードの防カビ性能が確保される。この種の糊は、通常、デンプンを含有しており、カビ等の菌類の栄養分となり得るものの、通常の使用量であれば、後述する試験の結果より、防カビ性能が確保される。 Further, in the case of the present invention, when the cloth is applied to the surface (one side or both sides) of the gypsum board, the amount of application of the paste for the cloth is a normal use amount (for example, 400 g / m 2 or less), The mold prevention performance of the gypsum board is secured. This type of paste usually contains starch and can serve as a nutrient for fungi such as fungi, but if it is used in a normal amount, antifungal performance is ensured from the results of the tests described below.
以下、実施例に基づいて本発明を更に詳細に説明する。なお、本発明はこれらの実施例により何ら限定されるものではない。 Hereinafter, the present invention will be described in more detail based on examples. In addition, this invention is not limited at all by these Examples.
〔試験体の作製〕
（実施例１）
半水石膏（焼石膏）７００ｇ、デンプン２．１ｇ（焼石膏１００ｇ当たり、０．３ｇ）及びポルトランドセメント７ｇ（焼石膏１００ｇ当たり、０．１ｇ）を混合した粉体を水８００ｇと混ぜ合わせて、石膏スラリーを調製した。調製したスラリーを、表原紙（坪量：２１０ｇ／ｍ２）と裏原紙（坪量：２１０ｇ／ｍ２）で挟み込んだ状態で５０分間養生し、２００℃に設定したオーブン内に６０分間静置した。その後、４０℃の乾燥機で恒量になるまで乾燥し、嵩密度が０．７７±０．０２ｇ／ｃｍ３のものを実施例１の試験体とした。
[Preparation of specimen]
Example 1
A powder prepared by mixing 700 g of hemihydrate gypsum (calcined gypsum), 2.1 g of starch (0.3 g per 100 g of calcined gypsum) and 7 g of Portland cement (0.1 g per 100 g of calcined gypsum) was mixed with 800 g of water, A gypsum slurry was prepared. The prepared slurry was cured for 50 minutes with being sandwiched between front base paper (basis weight: 210 g / m 2 ) and back base paper (basis weight: 210 g / m 2 ), and left in an oven set at 200 ° C. for 60 minutes. did. Then, it dried until it became constant weight with a 40 degreeC dryer, and the test body of Example 1 was made into a thing with a bulk density of 0.77 +/- 0.02 g / cm < 3 >.
（実施例２〜４及び参考例５〜７及び比較例１）
スラリーを調製する際に、デンプン及びポルトランドセメントの添加量（添加割合）を、表１に示されるものに変更したこと以外は、実施例１と同様にして、実施例２〜４及び参考例５〜７及び比較例１の試験体を作製した。
(Examples 2 to 4 and Reference Examples 5 to 7 and Comparative Example 1)
In preparing the slurry, Examples 2 to 4 and Reference Example 5 were performed in the same manner as in Example 1 except that the addition amounts (addition ratios) of starch and Portland cement were changed to those shown in Table 1. -7 and Comparative Example 1 specimens were prepared.
〔防カビ効果試験１（ポルトランドセメントの含有量と防カビ効果との関係）〕
実施例１〜７及び比較例１の各試験体について、ＪＩＳ Ｚ ２９１１の「かび抵抗性試験方法」に準拠しつつ、以下に示される条件、手順で防カビ効果試験１を行った。なお、実施例１〜５及び比較例１について、それぞれ２つの試験体（Ｎ＝１，Ｎ＝２）を用意して、それぞれ２回試験を行った。
[Anti-fungal effect test 1 (Relation between Portland cement content and anti-fungal effect)]
About each test body of Examples 1-7 and the comparative example 1, the antifungal effect test 1 was done on the conditions and procedures shown below, based on the "mold resistance test method" of JIS Z 2911. For Examples 1 to 5 and Comparative Example 1, two test bodies (N = 1, N = 2) were prepared, and the test was performed twice.
（試験菌）
試験菌としては、５種類の混合菌を使用した。具体的な菌種は、Aspergillus niger, Penicillium pinophilum, Cladosporium cladosporioides, Aurebasidium pullulans, Trichoderma virensである。
(Test bacteria)
Five types of mixed bacteria were used as test bacteria. Specific bacterial species are Aspergillus niger, Penicillium pinophilum, Cladosporium cladosporioides, Aurebasidium pullulans, Trichoderma virens.
（試験体の調製）
各試験体について、それぞれ容量２００ｍｌのビーカーを１つずつ用意し、各ビーカーに精製水２００ｍｌを入れ、水温を約２０℃に保ち、その水の中に試験体を浸して１８時間静置した。その後、水中から試験体を取り出し、８０〜８５℃に保たれた乾燥機の中に入れて２時間放置した。このようにして各試験体の前調製を行った。
(Preparation of test specimen)
For each specimen, one beaker with a capacity of 200 ml was prepared, 200 ml of purified water was put in each beaker, the water temperature was kept at about 20 ° C., the specimen was immersed in the water and allowed to stand for 18 hours. Thereafter, the test specimen was taken out of the water, placed in a dryer maintained at 80 to 85 ° C., and left for 2 hours. Thus, each specimen was pre-prepared.
（試験開始）
上記乾燥機から試験体を取り出し、その試験体を、シャーレ内の平板培地における培養面の中央に置いた。続いて、混合胞子懸濁液１ｍｌを培養面と試験体の上面とに均等に吹き付け、その後、シャーレに蓋をし、温度２６±２℃に保った場所にシャーレを置いて培養を開始した。
（防カビ効果の評価）
(Test start)
The test body was taken out from the dryer, and the test body was placed at the center of the culture surface in the flat plate medium in the petri dish. Subsequently, 1 ml of the mixed spore suspension was sprayed evenly on the culture surface and the upper surface of the test specimen, and then the petri dish was covered, and the petri dish was placed in a place maintained at a temperature of 26 ± 2 ° C. to start the culture.
(Evaluation of mold prevention effect)
培養期間は４週間であり、１週間毎（つまり、７日後、１４日後、２１日後及び２８日後）に、以下に示される評価基準に基づいて、各試験体の防カビ効果を目視で確認した。結果は表１に示した。 The culture period was 4 weeks, and the fungicidal effect of each specimen was visually confirmed on a weekly basis (that is, after 7, 14, 21, and 28 days) based on the evaluation criteria shown below. . The results are shown in Table 1.
（評価基準）
「○」：試験体の接種部分に菌糸の発育が認められない。
「△」：試験体の接種部分に認められる菌糸の発育部分の面積が、全面積の１／３未満である。
「×」：試験体の接種部分に認められる菌糸の発育部分の面積が、全面積の１／３以上である。
(Evaluation criteria)
“O”: No hyphal growth was observed in the inoculated part of the specimen.
“Δ”: The area of the growth part of the mycelium recognized in the inoculated part of the test specimen is less than 1/3 of the total area.
"X": The area of the mycelial growth part recognized in the inoculated part of the test specimen is 1/3 or more of the total area.
表１に示されるように、ポルトランドセメントの添加量が焼石膏１００質量部当たり０．１〜１０．０質量部である実施例１〜４及び参考例５〜７の各試験体では、菌糸の発育が認められず、防カビ効果を備えていることが確かめられた。
As shown in Table 1, in each specimen of Examples 1 to 4 and Reference Examples 5 to 7 in which the addition amount of Portland cement is 0.1 to 10.0 parts by mass per 100 parts by mass of calcined gypsum, The growth was not recognized, and it was confirmed that it had an antifungal effect.
各実施例の代表として、４週間後の実施例１の試験体（Ｎ＝１）の状態を撮影した写真を図２に示した。実施例１の試験体は、実施例１〜７の中でポルトランドセメントの含有量が最も少ないものの、図２に示されるように、その表面において菌糸が発育していないことが確かめられた。 As a representative of each example, a photograph of the state of the specimen (N = 1) of Example 1 after 4 weeks is shown in FIG. Although the test body of Example 1 had the smallest content of Portland cement among Examples 1 to 7, as shown in FIG. 2, it was confirmed that hyphae did not grow on the surface.
これに対し、ポルトランドセメントを含有していない比較例１の試験体では、試験開始から２週間後には、Ｎ＝２の場合に菌糸の育成が認められ、３週間後には、Ｎ＝１及びＮ＝２の何れの場合でも、試験体の表面の広範囲で、菌糸の育成が認められた。 On the other hand, in the test body of Comparative Example 1 that does not contain Portland cement, hyphae growth was observed when N = 2 after 2 weeks from the start of the test, and N = 1 and N after 3 weeks. In any case of = 2, hyphal growth was observed over a wide range of the surface of the specimen.
図３は、２週間後の比較例１の試験体（Ｎ＝２）の状態を撮影した写真を示す図である。図３に示されるように、試験体の表面に、菌糸が集合している部分が認められた。 FIG. 3 is a view showing a photograph of the state of the specimen (N = 2) of Comparative Example 1 after 2 weeks. As shown in FIG. 3, a portion where the mycelium was gathered was observed on the surface of the test body.
〔試験体の作製〕
（実施例８〜１０及び比較例２，３）
スラリーを調製する際に、デンプン及びポルトランドセメントの添加量（添加割合）を、表２に示されるものに変更したこと以外は、実施例１と同様にして、実施例８〜１０及び比較例２，３の試験体を作製した。なお、実施例８〜１０及び比較例２，３について、それぞれ２つの試験体（Ｎ＝１，Ｎ＝２）を用意して、それぞれ２回試験を行った。
[Preparation of specimen]
(Examples 8 to 10 and Comparative Examples 2 and 3)
When preparing the slurry, Examples 8 to 10 and Comparative Example 2 were performed in the same manner as Example 1 except that the addition amounts (addition ratios) of starch and Portland cement were changed to those shown in Table 2. , 3 specimens were prepared. For Examples 8 to 10 and Comparative Examples 2 and 3, two test bodies (N = 1, N = 2) were prepared, and the test was performed twice.
〔防カビ効果試験２（デンプンの含有量と防カビ効果との関係）〕
実施例８〜１０及び比較例２，３の各試験体について、上述した防カビ効果試験１と同様の方法で、試験及び評価を行った。結果は、表２に示した。
[Anti-fungal effect test 2 (Relation between starch content and anti-fungal effect)]
About each test body of Examples 8-10 and Comparative Examples 2 and 3, it tested and evaluated by the method similar to the anti-mold effect test 1 mentioned above. The results are shown in Table 2.
表２に示されるように、デンプンの添加量が焼石膏１００質量部当たり０．６〜２．４質量部である実施例８〜１０の各試験体では、Ｎ＝１及びＮ＝２の何れの場合でも、菌糸の発育が認められず、防カビ効果を備えていることが確かめられた。 As shown in Table 2, in each specimen of Examples 8 to 10 in which the added amount of starch is 0.6 to 2.4 parts by mass per 100 parts by mass of calcined gypsum, any of N = 1 and N = 2 Even in the case of, mycelium growth was not observed, and it was confirmed that it had an antifungal effect.
各実施例の代表として、４週間後の実施例１０の試験体（Ｎ＝１）の状態を撮影した写真を図４に示した。実施例１０の試験体は、実施例８〜１０の中でデンプンの含有量が最も多いものの、図４に示されるように、その表面において菌糸が発育していないことが確かめられた。 As a representative of each example, a photograph of the state of the test body of Example 10 (N = 1) after 4 weeks is shown in FIG. Although the test body of Example 10 had the highest starch content in Examples 8 to 10, as shown in FIG. 4, it was confirmed that hyphae did not grow on the surface.
これに対し、デンプンの添加量が焼石膏１００質量部当たり４．８〜９．６質量部である比較例２，３の各試験体では、２週間後には、Ｎ＝１及びＮ＝２の何れの場合でも、試験体の表面の広範囲で、菌糸の育成が認められた。 On the other hand, in each test body of Comparative Examples 2 and 3 in which the added amount of starch is 4.8 to 9.6 parts by mass per 100 parts by mass of calcined gypsum, N = 1 and N = 2 after 2 weeks. In any case, hyphal growth was observed over a wide area on the surface of the test specimen.
図５は、４週間後の比較例３の試験体（Ｎ＝１）の状態を撮影した写真を示す図である。図５に示されるように、試験体の表面に、菌糸が集合している部分が認められた。 FIG. 5 is a view showing a photograph of the state of the specimen (N = 1) of Comparative Example 3 after 4 weeks. As shown in FIG. 5, a portion where the mycelium was gathered was observed on the surface of the test body.
〔試験体の作製〕
（実施例１１〜１５）
スラリーを調製する際に、デンプン及びポルトランドセメントの添加量（添加割合）を、表３に示されるものに変更したこと以外は、実施例１と同様にして、実施例１１〜１５の試験体を作製した。なお、実施例１１〜１５について、それぞれ２つの試験体（Ｎ＝１，Ｎ＝２）を用意して、それぞれ２回試験を行った。
[Preparation of specimen]
(Examples 11 to 15)
When preparing the slurry, the test bodies of Examples 11 to 15 were prepared in the same manner as in Example 1 except that the addition amount (addition ratio) of starch and Portland cement was changed to that shown in Table 3. Produced. In addition, about Examples 11-15, each prepared two test bodies (N = 1, N = 2), and performed the test twice, respectively.
〔クロス用糊の塗布及びクロスの貼り付け〕
実施例１１〜１５の各試験体の両面に、それぞれ表３に示される塗布量で、クロス用糊を塗布した。その後、クロス用糊の塗布物に積層する形で、試験体の表面と同じ大きさのクロスを、各試験体の両面にそれぞれ貼り付けた。なお、クロスが貼り付けられた各試験体を、クロス付き試験体と称する。
[Application of glue for cloth and application of cloth]
The cloth paste was applied to both surfaces of each of the test bodies of Examples 11 to 15 in the application amounts shown in Table 3, respectively. Thereafter, a cloth having the same size as the surface of the test specimen was pasted on both sides of each specimen in a form of being laminated on the coated product of the cloth paste. In addition, each test body to which a cloth is attached is referred to as a test body with a cloth.
〔防カビ効果試験３（クロス用糊の塗布量と防カビ効果との関係）〕
実施例１１〜１５の各クロス付き試験体について、上述した防カビ効果試験１と同様の方法で、試験及び評価を行った。結果は、表３に示した。
[Anti-fungal effect test 3 (Relationship between amount of paste applied for cloth and anti-fungal effect)]
About each test body with a cloth of Examples 11-15, it tested and evaluated by the method similar to the anti-mold effect test 1 mentioned above. The results are shown in Table 3.
表３に示されるように、クロス用糊の塗布量が５０．０〜４００．０ｇ／ｍ２である実施例１１〜１５のクロス付き試験体では、Ｎ＝１及びＮ＝２の何れの場合でも、菌糸の発育が認められず、防カビ効果を備えていることが確かめられた。 As shown in Table 3, in the specimens with cloth of Examples 11 to 15 in which the amount of cloth paste applied was 50.0 to 400.0 g / m 2 , N = 1 and N = 2 However, the growth of mycelia was not recognized, and it was confirmed that it had an antifungal effect.
各実施例の代表として、４週間後の実施例１３の試験体（Ｎ＝１）の状態を撮影した写真を図６に示した。図６に示されるように、４週間後における実施例１３の試験体の表面には、菌糸が発育していないことが確かめられた。 As a representative of each example, a photograph of the state of the specimen (N = 1) of Example 13 after 4 weeks is shown in FIG. As shown in FIG. 6, it was confirmed that hyphae did not grow on the surface of the test body of Example 13 after 4 weeks.
〔ｐＨの測定〕
上記実施例１〜４及び参考例５〜７の各試験体のｐＨを測定した。ｐＨの測定は、「ＪＩＳ Ｒ ９１０１：１９９５ セッコウの化学分析方法」に準拠して行った。具体的には、試験体の芯材をすり鉢で粉砕して、芯材の粉末を作製し、その粉末５ｇを試料として水１００ｍｌに投入し、マグネチックスターラーを用いて４分間かき混ぜた。その後、ｐＨ計の電極を試料懸濁液に浸して、更にかき混ぜ、試料投入時から５分経過したときのｐＨの値を読み取った。測定の結果、実施例１がｐＨ６．７、実施例２がｐＨ６．８、実施例３がｐＨ６．７、実施例４がｐＨ６．８、参考例５がｐＨ１０．９、参考例６がｐＨ１１．０、参考例７がｐＨ１１．１であった。このように、実施例１〜４の試験体のｐＨは、略中性であり、参考例５〜７の各試験体はアルカリ性であることが確かめられた。このことより、実施例１〜４の各試験体に貼り付けられた原紙は、参考例５〜７の各試験体に貼り付けられた原紙と比べて、化学的に安定であり、腐食し難いと言える。
[Measurement of pH]
The pH of each test body of Examples 1 to 4 and Reference Examples 5 to 7 was measured. The pH was measured according to “JIS R 9101: 1995 Chemical analysis method of gypsum”. Specifically, the core material of the test body was pulverized in a mortar to prepare a core material powder, and 5 g of the powder was put into 100 ml of water as a sample and stirred for 4 minutes using a magnetic stirrer. Thereafter, the electrode of the pH meter was immersed in the sample suspension, and further stirred, and the pH value was read when 5 minutes had elapsed since the sample was charged. As a result of the measurement, Example 1 was pH 6.7, Example 2 was pH 6.8, Example 3 was pH 6.7, Example 4 was pH 6.8, Reference Example 5 was pH 10.9, Reference Example 6 was pH 11. 0 and Reference Example 7 had a pH of 11.1. Thus, pH of the test of Examples 1-4 is substantially neutral, each specimen of Reference Example 5-7 was confirmed to be alkaline. From this, the base paper affixed on each test body of Examples 1-4 is chemically stable and is hard to corrode compared with the base paper affixed on each test body of Reference Examples 5-7. It can be said.
１…石膏ボード、２…芯材、３，４…ボード用原紙 1 ... gypsum board, 2 ... core material, 3, 4 ... base paper for board
Claims (7)
前記スラリーは、ポルトランドセメントを含有し、前記ポルトランドセメントの含有量が、前記焼石膏１００質量部当たり、０．１〜１．０質量部であり、かつThe slurry contains Portland cement, and the Portland cement content is 0.1 to 1.0 parts by mass per 100 parts by mass of the calcined gypsum, and
前記スラリーは、デンプンを含有し、前記デンプンの含有量が、前記焼石膏１００質量部当たり、０．３〜２．４質量部である石膏ボード。The slurry contains starch, and the content of the starch is 0.3 to 2.4 parts by mass per 100 parts by mass of the calcined gypsum.
前記ボード用原紙の表面に形成され、クロス用糊が５０〜４００ｇ／ｍFormed on the surface of the board base paper, the cloth paste is 50 to 400 g / m ２2 の割合で塗布されてなる糊層を備える請求項１に記載の石膏ボード。The gypsum board of Claim 1 provided with the adhesive layer formed by the ratio of these.
前記スラリーに、ポルトランドセメントを、前記焼石膏１００質量部当たり、０．１〜１．０質量部の割合で、添加し、かつ、デンプンを、前記焼石膏１００質量部当たり、０．３〜２．４質量部の割合で添加する添加工程を有することを特徴とする石膏ボードの製造方法。Portland cement is added to the slurry at a ratio of 0.1 to 1.0 part by mass per 100 parts by mass of the calcined gypsum, and starch is added to 0.3 to 2 per 100 parts by mass of the calcined gypsum. The manufacturing method of the gypsum board characterized by having the addition process added in the ratio of 4 mass parts.
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