JPH05319890A - Gypsum composition - Google Patents
Gypsum compositionInfo
- Publication number
- JPH05319890A JPH05319890A JP4148324A JP14832492A JPH05319890A JP H05319890 A JPH05319890 A JP H05319890A JP 4148324 A JP4148324 A JP 4148324A JP 14832492 A JP14832492 A JP 14832492A JP H05319890 A JPH05319890 A JP H05319890A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- gypsum
- polymer
- polyvinyl alcohol
- pts
- 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.)
- Pending
Links
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は建材用などに使用される
石膏ボード、各種型枠および彫刻などの成形物に好適な
強度の優れた石膏系成形物が得られる石膏組成物に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gypsum composition capable of obtaining a gypsum-based molded product having excellent strength, which is suitable for molded products such as gypsum board used for building materials, various forms and engravings.
【０００２】[0002]
【従来の技術】石膏を主成分とする粉末を硬化すること
により得られた石膏系成形物は比較的脆く、強度も低
い。例えば石膏ボードは、半水石膏を主成分とする粉体
を水に濁懸したスラリーを紙上に流し硬化したものであ
るが、石膏ボードの表裏から狭んだ紙により補強してい
る。更に強度の高い石膏ボードを得るためには、石膏の
厚みを厚くすることにより対応している。しかしなが
ら、同じ物性であれば、軽く薄い方が扱い易いことか
ら、強度の高い石膏系組成物が望まれていた。2. Description of the Related Art A gypsum-based molding obtained by curing a powder containing gypsum as a main component is relatively brittle and has low strength. For example, a gypsum board is one in which a powder containing hemihydrate gypsum as a main component is slurried and suspended in water and poured onto paper to cure it. The gypsum board is reinforced with paper narrowed from the front and back. In order to obtain a stronger gypsum board, the thickness of gypsum is increased. However, a gypsum-based composition having high strength has been desired because it is easier to handle if it has the same physical properties as it is light and thin.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、半水
石膏を主成分とする粉末を水と混和した時の発熱によ
り、バインダーが溶解し、強度の高い石膏系成形物が得
られる石膏組成物を提供することにある。DISCLOSURE OF THE INVENTION An object of the present invention is to obtain a gypsum-based molded product having a high strength by dissolving a binder due to heat generated when a powder containing hemihydrate gypsum as a main component is mixed with water. To provide a composition.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に鋭意検討した結果、８０℃の水に２０分間で９０％以
上が溶解するポリビニルアルコール系重合体粉末（Ａ）
および該ポリビニルアルコール系重合体を増粘させうる
粉末（Ｂ）を、半水石膏を主成分とする粉体（Ｃ）に配
合した石膏組成物を見出し、本発明を完成させるに到っ
た。[Means for Solving the Problems] As a result of intensive studies to solve the above problems, a polyvinyl alcohol polymer powder (A) in which 90% or more is dissolved in water at 80 ° C. for 20 minutes
Further, the inventors have found a gypsum composition in which the powder (B) capable of increasing the viscosity of the polyvinyl alcohol polymer is mixed with the powder (C) containing hemihydrate gypsum as a main component, and have completed the present invention.
【０００５】本発明の石膏組成物において、８０℃の水
に２０分間で９０％以上が溶解するポリビニルアルコー
ル粉末（Ａ）とは、半水石膏を水に混和した時の発熱に
より溶解するものを意味する。ポリビニルアルコール系
重合体（Ａ）の重合度は５００以上が好ましく、１００
０以上がより好ましい。ポリビニルアルコール系重合体
（Ａ）のけん化度については、水溶性の範囲のものであ
れば特に制限はないが、強度の点から、けん化度９４モ
ル％以上が好ましい。また変性ポリビニルアルコールの
場合には、強度の点から、けん化度９５モル％以上が好
ましい。本発明のポリビニルアルコール系重合体（Ａ）
としては、未変性ポリビニルアルコール；カルボキシル
基、スルホン酸などのアニオン変性ポリビニルアルコー
ル；カチオン変性ポリビニルアルコール；ピバリン酸ビ
ニル、バーサチッチ酸ビニルなどのノニオン変性ポリビ
ニルアルコールが挙げられる。カルボキシル基変性ポリ
ビニルアルコールとは、マレイン酸、イタコン酸、メタ
アクリル酸、アクリル酸等の変性ポリビニルアルコール
を意味する。カルボキシル基変性ポリビニルアルコール
の変性度は特に制限はないが、変性度０．５〜６モル％
が使い易く効果が大きい。In the gypsum composition of the present invention, the polyvinyl alcohol powder (A) in which 90% or more of which is dissolved in water at 80 ° C. for 20 minutes is one which is dissolved by heat generated when hemihydrate gypsum is mixed with water. means. The polymerization degree of the polyvinyl alcohol polymer (A) is preferably 500 or more,
0 or more is more preferable. The saponification degree of the polyvinyl alcohol polymer (A) is not particularly limited as long as it is in the water-soluble range, but from the viewpoint of strength, the saponification degree is preferably 94 mol% or more. In the case of modified polyvinyl alcohol, the saponification degree is preferably 95 mol% or more from the viewpoint of strength. Polyvinyl alcohol polymer (A) of the present invention
Examples thereof include unmodified polyvinyl alcohol; anion-modified polyvinyl alcohol such as carboxyl group and sulfonic acid; cation-modified polyvinyl alcohol; nonion-modified polyvinyl alcohol such as vinyl pivalate and vinyl versatate. The carboxyl group-modified polyvinyl alcohol means a modified polyvinyl alcohol such as maleic acid, itaconic acid, methacrylic acid and acrylic acid. The modification degree of the carboxyl group-modified polyvinyl alcohol is not particularly limited, but the modification degree is 0.5 to 6 mol%.
Is easy to use and has a great effect.
【０００６】ポリビニルアルコール系重合体（Ａ）の粒
子径は、溶解性の点から、けん化度が９９モル％より大
の場合には、粒子径は１００メッシュパスが好ましく、
２００メッシュパスがより好ましい。けん化度が９４〜
９９モル％の場合には、粒子径は５０メッシュパスが好
ましく、１００メッシュパスがより好ましい。けん化度
が９４モル％未満の場合には、粒子径は１４メッシュパ
スが好ましく、３０メッシュパスがより好ましい。カル
ボキシル基変性ポリビニルアルコール、スルホン酸変性
ポリビニルアルコール等のアニオン変性ポリビニルアル
コールは水への溶解性が良好なことから特に好ましく、
比較的粒子径の大きいものでも使いうるが、３０メッシ
ュパスの粒子径が好ましい。From the viewpoint of solubility, the particle size of the polyvinyl alcohol polymer (A) is preferably 100 mesh pass when the degree of saponification is more than 99 mol%.
A 200 mesh pass is more preferred. Saponification degree is 94 ~
In the case of 99 mol%, the particle size is preferably 50 mesh pass, more preferably 100 mesh pass. When the degree of saponification is less than 94 mol%, the particle size is preferably 14 mesh pass, more preferably 30 mesh pass. Carboxyl group-modified polyvinyl alcohol, anion-modified polyvinyl alcohol such as sulfonic acid-modified polyvinyl alcohol are particularly preferable because they have good solubility in water,
Although a particle having a relatively large particle size can be used, a particle size of 30 mesh pass is preferable.
【０００７】ポリビニルアルコール系重合体を増粘させ
うる粉末（Ｂ）としては、ポリビニルアルコールまたは
変性ポリビニルアルコールの官能基である水酸基、カル
ボキシル基、スルホン酸基等と反応したり、あるいはキ
レートを形成したりして増粘させうる粉体を意味する。
例えば硼酸、硼酸ナトリウム、硼酸カリウム、硼酸アン
モニウム等の水溶性の硼酸化合物；硫酸鉄、硫酸銅、硫
酸クロム、硫酸アルミニウム、硫酸亜鉛、硝酸鉄、塩化
鉄、硝酸アルミニウム、塩化マンガン、塩化チタン等水
溶性の多価金属塩；レゾルシノール、カテュール、フロ
ログルシノール、バンサン、没食子酸などが挙げられ
る。これらの粉末（Ｂ）は、適当にｐＨ調整して水との
混和時にゲル化しない様にして使用する必要がある。本
発明における半水石膏を主成分とする粉末（Ｃ）には、
必要に応じて硫酸アルミニウム、硫酸ナトリウム、硫酸
マグネシウム、塩化ナトリウム、ペプトン等の硬化調整
剤、リグニンスルホン酸塩、スルホン化メラミン樹脂等
の減水剤メチルセルロース、カルボキシメチルセルロー
ス、ポリ酢酸ビニルエマルジョン等を添加しても良い。The powder (B) capable of thickening the polyvinyl alcohol polymer reacts with a functional group of polyvinyl alcohol or modified polyvinyl alcohol such as a hydroxyl group, a carboxyl group and a sulfonic acid group, or forms a chelate. It means a powder that can be thickened.
Water-soluble boric acid compounds such as boric acid, sodium borate, potassium borate, ammonium borate, etc .; water-soluble iron sulfate, copper sulfate, chromium sulfate, aluminum sulfate, zinc sulfate, iron nitrate, iron chloride, aluminum nitrate, manganese chloride, titanium chloride, etc. And polyvalent metal salts; resorcinol, cathel, phloroglucinol, bansan, gallic acid and the like. It is necessary to adjust the pH of these powders (B) appropriately so as not to gel when mixed with water. In the powder (C) containing hemihydrate gypsum as a main component in the present invention,
Add aluminum sulfate, sodium sulfate, magnesium sulfate, sodium chloride, peptone or other curing modifier, lignin sulfonate, water reducing agent such as sulfonated melamine resin, methyl cellulose, carboxymethyl cellulose, polyvinyl acetate emulsion, etc. as needed. Is also good.
【０００８】上記の粉末（Ａ）、粉末（Ｂ）および粉末
（Ｃ）の配合割合については特に制限はないが、以下の
配合割合は好ましい。成分（Ｃ）１００重量部に対し
て、成分（Ａ）は０．２〜５重量部が好ましく、０．５
〜２重量部がより好ましい。成分（Ａ）１００重量部に
対して成分（Ｂ）は１〜３０重量部が好ましく、２〜２
０重量部がより好ましい。There are no particular restrictions on the compounding ratio of the above powder (A), powder (B) and powder (C), but the following compounding ratios are preferred. The component (A) is preferably 0.2 to 5 parts by weight, and 0.5 to 100 parts by weight of the component (C).
˜2 parts by weight is more preferred. Component (B) is preferably 1 to 30 parts by weight, and 2 to 2 per 100 parts by weight of component (A).
0 weight part is more preferable.
【０００９】[0009]
【実施例】次に実施例、比較例をあげて本発明を具体的
に説明する。なお、以下の実施例において「部」とは、
特に断わりのない限り、「重量部」を意味する。各例に
共通した試験項目、試験方法が次の通りである。 １）試験体の製作 本発明及び比較例の石膏組成物と混練水を混和したスラ
リーを、２ｃｍ×２ｃｍ×８ｃｍの成形用の型枠に流し
込み、水和硬化後脱型し試験体として温度２０℃の水を
張ったデシケーター中に７日間養生した後、取り出して
３５℃の乾燥機中にて恒量になるまで乾燥し、曲げ強度
測定用試験体とした。 ２）曲げ強度の測定 ＪＩＳ−Ａ−６９０４「せっこうプラスター」５．５に
より測定した。EXAMPLES Next, the present invention will be specifically described with reference to Examples and Comparative Examples. In the following examples, "part" means
Unless otherwise specified, it means "part by weight". The test items and test methods common to each example are as follows. 1) Manufacture of Specimen A slurry prepared by mixing the gypsum composition of the present invention and the comparative example with kneading water was poured into a mold for molding having a size of 2 cm × 2 cm × 8 cm, and after hydration curing, the mold was removed and the temperature was set to 20 After curing in a desiccator filled with water at ℃ for 7 days, it was taken out and dried in a drier at 35 ℃ until a constant weight was obtained to obtain a bending strength measurement test body. 2) Measurement of bending strength It was measured according to JIS-A-6904 "Gypsum plaster" 5.5.
【００１０】実施例１ 表１に示す石膏組成物について、上記の方法で成形し、
曲げ強度を測定した。その結果を表１に示す。Example 1 The gypsum composition shown in Table 1 was molded by the above method,
The bending strength was measured. The results are shown in Table 1.
【００１１】[0011]
【表１】 [Table 1]
【００１２】実施例２ 半水石膏１００重量部にマレイン酸２モル％を共重合し
た重合度１７５０、けん化度９８モル％、粒子径３０メ
ッシュパスのカルボキシル基変性ポリビニルアルコール
１部および表２に示す増粘させうる粉体（Ｂ）０．１部
をよく混合後、混練水３３部と混練し成型した後、曲げ
強度を測定した。その結果を表２に示す。Example 2 100 parts by weight of hemihydrate gypsum were copolymerized with 2 mol% of maleic acid to give a polymerization degree of 1750, a saponification degree of 98 mol% and a carboxyl group-modified polyvinyl alcohol having a particle size of 30 mesh and 1 part and Table 2 After thoroughly mixing 0.1 part of the powder (B) capable of thickening, kneading with 33 parts of kneading water and molding, bending strength was measured. The results are shown in Table 2.
【００１３】[0013]
【表２】 [Table 2]
【００１４】[0014]
【発明の効果】半水石膏が水硬時に発生する熱により、
ポリビニルアルコール系重合体粉末（Ａ）の大部分を溶
解させ、更にポリビニルアルコール系重合体を増粘させ
る物質（Ｂ）により架橋させ、ポリビニルアルコール系
重合体のバインダー作用を増強させることにより、粉末
使用の便利さならびに石膏を硬化させることにより得ら
れた成形体の強度の向上に寄与する。EFFECT OF THE INVENTION Due to the heat generated when hemihydrate gypsum is hydraulically set,
Most of the polyvinyl alcohol-based polymer powder (A) is dissolved, and the polyvinyl alcohol-based polymer is thickened by crosslinking with a substance (B) to increase the binder action of the polyvinyl alcohol-based polymer, thereby using the powder. Contributes to the convenience of and the improvement of the strength of the molded product obtained by curing the gypsum.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 //(Ｃ０４Ｂ 28/14 24:26） Ｂ 2102−4Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display area // (C04B 28/14 24:26) B 2102-4G
Claims (1)
解するポリビニルアルコール系重合体粉末（Ａ）および
該ポリビニルアルコール系重合体を増粘させうる粉末
（Ｂ）を、半水石膏を主成分とする粉体（Ｃ）に配合し
た石膏組成物。1. A polyvinyl alcohol-based polymer powder (A) capable of dissolving 90% or more in water at 80 ° C. for 20 minutes and a powder (B) capable of thickening the polyvinyl alcohol-based polymer, and a hemihydrate gypsum. A gypsum composition blended with powder (C) as the main component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4148324A JPH05319890A (en) | 1992-05-13 | 1992-05-13 | Gypsum composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4148324A JPH05319890A (en) | 1992-05-13 | 1992-05-13 | Gypsum composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05319890A true JPH05319890A (en) | 1993-12-03 |
Family
ID=15450239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4148324A Pending JPH05319890A (en) | 1992-05-13 | 1992-05-13 | Gypsum composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05319890A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007122804A1 (en) | 2006-04-21 | 2007-11-01 | Next21 K.K. | Figure-forming composition, process for production of figures in three dimensions by using the composition and process for production of three-dimensional structures |
| JP6683339B1 (en) * | 2019-03-22 | 2020-04-15 | ポリマーアソシエイツ合同会社 | Gypsum molding excellent in chipping resistance and compressive strength and method for producing the same |
| CN113800867A (en) * | 2021-08-06 | 2021-12-17 | 北新集团建材股份有限公司 | Thistle board |
-
1992
- 1992-05-13 JP JP4148324A patent/JPH05319890A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007122804A1 (en) | 2006-04-21 | 2007-11-01 | Next21 K.K. | Figure-forming composition, process for production of figures in three dimensions by using the composition and process for production of three-dimensional structures |
| US8105517B2 (en) | 2006-04-21 | 2012-01-31 | Next21 K.K. | Figure-forming composition, method for forming three-dimensional figures and three-dimensional structures by using the same |
| JP6683339B1 (en) * | 2019-03-22 | 2020-04-15 | ポリマーアソシエイツ合同会社 | Gypsum molding excellent in chipping resistance and compressive strength and method for producing the same |
| WO2020194372A1 (en) * | 2019-03-22 | 2020-10-01 | ポリマーアソシエイツ合同会社 | Plaster molding having excellent chipping resistance and compressive strength, and production method therefor |
| CN113800867A (en) * | 2021-08-06 | 2021-12-17 | 北新集团建材股份有限公司 | Thistle board |
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