JP3719706B2 - Dispersant for gypsum slurry - Google Patents
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- JP3719706B2 JP3719706B2 JP2001201276A JP2001201276A JP3719706B2 JP 3719706 B2 JP3719706 B2 JP 3719706B2 JP 2001201276 A JP2001201276 A JP 2001201276A JP 2001201276 A JP2001201276 A JP 2001201276A JP 3719706 B2 JP3719706 B2 JP 3719706B2
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Description
【０００１】
【発明の属する技術分野】
本発明は石膏スラリー用分散剤、該分散剤を含有した石膏スラリー及び該分散剤を用いた石膏ボードの製造方法に関する。
【０００２】
【従来の技術】
石膏ボード等に用いられる石膏スラリーの製造において、界面活性剤は分散剤としての役割を担っている。
【０００３】
分散性においては界面活性剤よりも優れている一連の水溶性高分子と界面活性剤とを併用して、石膏スラリーの流動性を付与する試みがなされている。特開昭５２−８０２７号公報には、スルホン酸系セメント分散剤とリン酸エステル系界面活性剤を含有した流動性石膏プラスター組成物が、特開昭５５−２３０４７号公報には、β−ナフタレンスルホン酸ホルムアルデヒド縮合物と特定構造のノニオン系界面活性剤を含有したスラリーが開示されている。
しかしながら、特に石膏ボードの製造のように、石膏と混練水とを極めて短時間で混練して、石膏スラリーに適正な流動性を付与しなければならない場合に、従来開示されてきた方法では分散力が不十分である。
【０００４】
一方、石膏ボードの工程では、多くの場合、混練水と独立に泡沫を形成し、混練水と石膏及び泡沫を混合することで石膏スラリーに流動性を与えつつ、石膏スラリー中に適性な気泡を混入する方法が検討されている。この泡沫を形成する際の起泡剤として、例えば、特開平７−２９１７６１号公報には、特定構造のアルキル硫酸エステル塩と特定構造のアルキルエーテルとを含有した軽量石膏ボード製造用起泡剤について開示されている。
しかしながら、例えば、石膏の分散性に特に優れる剤であるナフタレンスルホン酸ホルムアルデヒド縮合物を含有した混練水は破泡性が強く、石膏及び泡沫と混合した際に、泡沫由来の気泡が不安定となる。
【０００５】
【発明が解決しようとする課題】
本発明の目的は、石膏と混練水とが短時間で混合し、良好な流動性を有する石膏スラリーを製造することができ、かつ泡沫の安定性を良好に確保し得る石膏スラリー用分散剤並びにかかる分散剤を用いた石膏スラリー及び石膏ボードの製造方法を提供することにある。
【０００６】
【課題を解決するための手段】
本発明は、
（１） ナフタレンスルホン酸塩ホルムアルデヒド縮合物と、アルキル硫酸エステル塩とを含有した石膏スラリー用分散剤であって、ナフタレンスルホン酸塩ホルムアルデヒド縮合物とアルキル硫酸エステル塩の固形分重量比率（ナフタレンスルホン酸塩ホルムアルデヒド縮合物／アルキル硫酸エステル塩）が９７／３〜５０／５０である石膏スラリー用分散剤、
（２） 前記石膏スラリー用分散剤、水及び石膏を含有した石膏スラリー、並びに
（３） 前記石膏スラリー用分散剤、混練水、石膏及び泡沫を混合して石膏スラリーを調製し、得られた石膏スラリーを用いて石膏ボードを調製する工程を有する石膏ボードの製造方法に関する。
【０００７】
【発明の実施の形態】
一般に、アルキル硫酸エステル塩は、その優れた起泡性故に、石膏スラリー用の分散剤としては使い難く、むしろ優れた起泡剤として使用されており、特に、石膏ボードの製造においては、泡沫製造用の起泡剤として使用されている。しかしながら、本件発明者らが、アルキル硫酸エステル塩の分散機能について種々検討した結果、アルキル硫酸エステル塩が特定の範囲の使用量において、石膏粒子の濡れ性を向上することができ、さらに、特定の水溶性高分子と併用して石膏スラリーを製造することにより、石膏スラリー中に余分な気泡を発生することなく水溶性高分子の分散性を向上し得ることと、石膏ボードの製造において石膏スラリー中に泡沫が混入した時に安定した気泡を形成し得るという全く新規な知見を見出した。
【０００８】
水溶性高分子は、ナフタレンスルホン酸塩ホルムアルデヒド縮合物、メラミンスルホン酸塩ホルムアルデヒド縮合物及びポリアルキレングリコール（メタ）アクリレート共重合物からなる群より選ばれた１種以上であり、単独の高分子であっても、２種以上の併用であってもよいが、これらの中では、石膏の分散力に優れたナフタレンスルホン酸塩ホルムアルデヒド縮合物が好ましい。
【０００９】
ナフタレンスルホン酸塩ホルムアルデヒド縮合物の市販品としては、「マイテイ１５０」（花王（株）製）等の、メラミンスルホン酸塩ホルムアルデヒド縮合物の市販品としては「マイテイ１５０Ｖ−２」（花王（株）製）等の、ポリアルキレングリコール（メタ）アクリレート共重合物の市販品としては「ＦＣ−６００Ｓ」（（株）日本触媒製）、「マイテイ２１Ｇ」（ボレガード（株）製）等が、それぞれ挙げられる。
【００１０】
アルキル硫酸エステル塩において、アルキル基の炭素数は８〜２２が好ましいが、アルキル硫酸エステル塩はさらに炭素数６〜２２のアリーレン基、好ましくはフェニレン基を有していてもよく、アルキル基にはオキシエチレン基（付加モル数：１〜３０）が付加されていてもよい。塩は一価金属塩、アンモニウム塩、アミノアルコール基が好ましい。
【００１１】
アルキル硫酸エステル塩としては、ポリオキシエチレンアルキル硫酸エステル塩がより好ましく、特にアルキル基の炭素数が１０〜１４、オキシエチレン基の付加モル数が１〜５のものがよりが好ましい。このようなアルキル硫酸エステル塩の市販品としては、「エマール２０Ｃ」、「エマール２７Ｃ」、「エマールＤ−３−Ｄ」（以上、花王（株）製）等が挙げられる。
【００１２】
水溶性高分子とアルキル硫酸エステル塩の固形分重量比率（水溶性高分子／アルキル硫酸エステル塩）は、９７／３〜５０／５０、好ましくは９５／５〜６０／４０、より好ましくは９０／１０〜７０／３０である。アルキル硫酸エステル塩の含有量が少なすぎると、混練水に石膏粉末に対して十分な濡れ性が付与できず、逆に含有量が多すぎると、混練水と石膏を混合した際に、粗大泡を巻き込み、流動性が低下するとともに、石膏スラリー中の気泡量が過剰となり好ましくない。
【００１３】
本発明の石膏スラリー分散剤、水及び石膏を含有する石膏スラリーは、例えば、石膏スラリー用分散剤と水とからなる混練水を、石膏と混合することにより得ることができるが、本発明の石膏スラリー用分散剤を用いることにより、石膏と混練水とを短時間で混合することができ、良好な流動性を有する石膏スラリーを製造することができる。
【００１４】
石膏は、無水、半水、二水石膏等のいずれでもよいが、半水石膏が好ましい。
【００１５】
混練水中の石膏スラリー用分散剤の含有量は、短時間の混練で石膏を分散でき過剰な気泡をまきこまない程度であれば、特に限定されないが、水溶性高分子の量が、石膏１００重量部に対して、固形分で、好ましくは０．０１〜１．０重量部、より好ましくは０．０５〜０．５重量部となるように、調整することが望ましい。また、水の含有量は、石膏１００重量部に対して、５０〜７０重量部が好ましい。
【００１６】
水溶性高分子とアルキル硫酸エステル塩は、予め両者を混合し、本発明の分散剤として添加してもよく、石膏スラリーの製造工程において、混練水中に別々に添加してもよい。また、添加する水溶性高分子とアルキル硫酸エステル塩は、液状であっても粉末状であってもよいが、計量精度を考慮すると、いずれの態様においても液状が好ましい。
【００１７】
本発明においては、石膏及び混練水とともに、必要に応じて、公知の添加剤を添加してもよい。添加剤としては、分散剤、水溶性高分子、ＡＥ剤、遅延剤、早強剤、促進剤、起泡剤、発泡剤、消泡剤、防水剤、防錆剤、着色剤、防黴剤、ひびわれ低減剤、高分子エマルジョン、膨張剤、繊維類、染料、顔料等が挙げられ、これらは単独であっても、または２種以上の併用であってもよい。
【００１８】
以上に説明した石膏、混練水、添加剤等を、ピンミキサー等を用いて混合することにより、石膏スラリーを得ることができる。
【００１９】
さらに、本発明で得られる石膏スラリーを用いて石膏ボードを製造することにより、泡沫の安定性を良好に確保することができる。予め本発明に係る分散剤を含有した混練水と石膏及び泡沫を混合することで、流動性及びスラリー中の泡沫安定性の極めて良好な石膏スラリーを得ることができ、石膏ボードの生産性と硬化後の石膏ボード中の気泡の均一性を向上することができる。
【００２０】
泡沫は、起泡剤を、好ましくは０．０１〜３重量％、より好ましくは０．１〜１重量％の濃度の水溶液とし、これを発泡させて得られ、泡沫の添加容量は、スラリーの軽量化の観点から、石膏１００重量部に対して２〜２００容量部が好ましい。なお、石膏の重量部と泡沫の容量部の関係は石膏の密度から計算する。
【００２１】
起泡剤は、特に限定されないが、本発明では、式（Ｉ）：
Ｒ1 Ｏ（ＡＯ）n ＣＨ2 ＣＯＯＨ （Ｉ）
〔式中、Ｒ1 は炭素数６〜２６、好ましくは炭素数６〜１２のアルキル基もしくはアルケニル基又はＲ2 −（Ｃ6 Ｈ4 ）−Ｏ−（Ｒ2 は水素原子又は炭素数１〜１２のアルキル基である）で表される基、ＡＯは炭素数２〜３のオキシアルキレン基、ｎはＡＯの平均付加モル数を表し１〜１００の数を示す〕
で表される化合物及びその塩からなる群より選ばれた１種以上が好ましい。式（Ｉ）で表される化合物の塩は、アルカリ金属塩、アルカリ土類金属塩、アンモニウム塩並びに水酸基を有していてもよい炭素数２〜８のモノ、ジ及びトリアルキルアンモニウム塩からなる群より選ばれた１種以上が好ましく、アルカリ金属塩がより好ましい。
【００２２】
式（Ｉ）で表される化合物は、例えば、アルコールのオキシアルキレン付加物とモノクロロ酢酸の反応により得ることができ、具体的には、ポリオキシアルキレンヘキシルエーテル酢酸、ポリオキシアルキレンオクチルエーテル酢酸、ポリオキシアルキレンラウリルエーテル酢酸、ポリオキシアルキレンオレイルエーテル酢酸、ポリオキシアルキレンセチルエーテル酢酸、ポリオキシアルキレンフェニルエーテル酢酸、ポリオキシアルキレンメチルフェニルエーテル酢酸、ポリオキシアルキレンノニルフェノールエーテル酢酸、及びこれらのナトリウム塩、カリウム塩、リチウム塩、カルシウム塩、アンモニウム塩、モノ、ジ、トリエタノールアンモニウム塩等が挙げられる。これらの中では、起泡性及び水溶解性の観点から、ポリオキシアルキレンラウリルエーテル酢酸及びポリオキシアルキレンノニルフェノールエーテル酢酸のアルカリ金属塩が好ましい。
【００２３】
式中、ＡＯで表されるオキシアルキレン基は、エチレンオキシド及び／又はプロピレンオキシドであり、その付加形態は、単独付加、ランダム付加及びブロック付加のいずれであってもよいが、起泡性を考慮すると、エチレンオキシド単独付加重合体が好ましい。
【００２４】
ＡＯの平均付加モル数を表すｎは、１〜１００、好ましくは１〜５０、より好ましくは１〜１０である。ｎが１未満では、起泡性が低下し、ｎが１００を超えると気泡安定性が低下傾向にある。
【００２５】
混練水、石膏及び泡沫の混合は、ピンミキサー等を用いて行うことができ、混合時間は、それらが十分に混ざり合う程度であれば特に限定されない。得られた石膏スラリーは、常法により、例えば、『石膏石灰ハンドブック』（石膏石灰学会編）第３２２〜３２４頁に記載の「石膏ボード製造」を参照することにより、石膏ボードに成形することができる。
【００２６】
【実施例】
実施例Ａ−１〜１６、比較例Ａ−１〜１３及び参考例Ａ−１〜３
石膏スラリーＩ： 半水石膏１０００ｇと表１、２に示す水溶性高分子及び界面活性剤を、表３、４に記載の処方に従って混合して得られる混練水６００ｇとを小型ピンミキサーに投入して、３００ｒ／ｍｉｎで５秒間混合して、石膏スラリーを調製した。
石膏スラリーII： 半水石膏１０００ｇと表１、２に示す水溶性高分子及び界面活性剤を、表３、４に記載の処方に従って混合して得られる混練水４５０ｇとを小型ピンミキサーに投入して、３００ｒ／ｍｉｎで５秒間混合して、石膏スラリーを調製した。
得られた石膏スラリーの流動性を以下に示す方法に従って測定した。結果を表１、２に示す。
【００２７】
なお、石膏スラリーを調製する際、予め水溶性高分子と界面活性剤とを混合したものを混練水に添加する形態を「１液」、水溶性高分子と界面活性剤とを別々に混練水に添加す形態を「２液」として、表３、４に示す（以下、表５についても同じ）。
【００２８】
〔流動性の評価〕
直径５０ｍｍ×高さ５０ｍｍのコーンに石膏スラリーを充填し、引き抜き後の拡がり（ｍｍ）を測定する。
【００２９】
【表１】
【表２】
【表３】
【表４】
実施例Ａ−１〜１６と比較例Ａ−１〜１３の対比より、石膏スラリーの流動性の発現には、本発明に係る水溶性高分子とアルキル硫酸エステル塩を含有する分散剤を、特定の固形分比率の範囲で使用した場合に極めて有効であることがわかる。
【００３４】
実施例Ｂ−１〜５、比較例Ｂ−１〜５及び参考例Ｂ−１〜３
起泡剤（ポリオキシエチレン（平均付加モル数＝３）ラウリル硫酸エステルナトリウム塩）の０．３重量％水溶液３０ｍｌを発泡機により６００ｍｌの泡沫とした。得られた泡沫６００ｍｌ（３０ｇ）を、半水石膏（β型、密度：２．５０ｇ／ｍｌ）１０００ｇ及び表１、２に示す界面活性剤、水溶性高分子を、表５に記載の処方に従って混合して得られる混練水５７０ｇとともに５リットル容のピンミキサーに投入して、５秒間混合し、気泡が混入した石膏スラリーを調製し、その流動性と泡沫安定性を測定した。結果を表５に示す。流動性の評価方法は前記のとおりである。
【００３５】
さらに、得られた石膏スラリーを石膏ボード用原紙を敷いた、縦１０ｃｍ、横２０ｃｍ、高さ１２ｍｍの型枠に流し込み、更に上から石膏ボード用原紙を載せ、空隙が入らないようにサンドイッチに成形する。９０℃で１時間乾燥し、脱型した硬化体を更に１００℃で１時間乾燥することにより、石膏ボードを得た。得られた石膏ボードを切断し、気泡状態を観察したところ、気泡が均一に分散した石膏ボードであった。
【００３６】
〔泡沫安定性の評価〕
得られた石膏スラリーの一定容積当たりの重量を計量し、比重〔重量（ｇ）／容積（ｍｌ）〕を用い、下記式により得られた値から、泡沫の安定性を測定する。得られた値が大きい程、泡沫安定性は良好である。
【００３７】
【数１】
【表５】
実施例Ｂ−１〜５と比較例Ｂ−１〜５との対比より、石膏ボード用スラリーの流動性の発現とスラリー中の泡沫安定性に、本発明に係る水溶性高分子とアルキル硫酸エステル塩を含有した分散剤が極めて有効であることがわかる。
【００４０】
【発明の効果】
本発明により、石膏と混練水とが短時間で混合し良好な流動性を有する石膏スラリーを製造し得る方法、並びにかかる石膏スラリーの製造に用いられ得る、泡沫の安定性を良好に確保できる石膏スラリー用分散剤及びかかる石膏スラリーを用いた石膏ボードの製造方法を提供することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dispersant for gypsum slurry, a gypsum slurry containing the dispersant, and a method for producing a gypsum board using the dispersant.
[0002]
[Prior art]
In the production of gypsum slurry used for gypsum board and the like, the surfactant plays a role as a dispersant.
[0003]
Attempts have been made to impart flowability of gypsum slurry by using a combination of a series of water-soluble polymers that are superior to surfactants and surfactants in terms of dispersibility. JP-A 52-8027 discloses a flowable gypsum plaster composition containing a sulfonic acid cement dispersant and a phosphate ester surfactant, and JP-A 55-23047 discloses β-naphthalene. A slurry containing a sulfonic acid formaldehyde condensate and a nonionic surfactant having a specific structure is disclosed.
However, in the case where gypsum and kneaded water are kneaded in an extremely short time to give proper flowability to the gypsum slurry, particularly in the case of gypsum board production, the conventionally disclosed method has a dispersion force. Is insufficient.
[0004]
On the other hand, in the gypsum board process, in many cases, foam is formed independently of the kneaded water, and by mixing the kneaded water, the gypsum and the foam, fluidity is given to the gypsum slurry, and suitable bubbles are formed in the gypsum slurry. Methods for mixing are being studied. As a foaming agent when forming this foam, for example, JP-A-7-291176 discloses a foaming agent for producing a lightweight gypsum board containing an alkyl sulfate ester salt having a specific structure and an alkyl ether having a specific structure. It is disclosed.
However, for example, kneaded water containing naphthalene sulfonic acid formaldehyde condensate, which is an agent that is particularly excellent in dispersibility of gypsum, has strong foam breaking properties, and bubbles derived from foam become unstable when mixed with gypsum and foam. .
[0005]
[Problems to be solved by the invention]
An object of the present invention is to disperse a gypsum slurry that can be mixed with gypsum and kneaded water in a short time, can produce a gypsum slurry having good fluidity, and can ensure good foam stability. It is providing the manufacturing method of the gypsum slurry and gypsum board using such a dispersing agent.
[0006]
[Means for Solving the Problems]
The present invention
(1) naphthalene sulfonate-formaldehyde condensate and, a gypsum slurry dispersing agent containing an alkyl sulfate, a solid weight ratio (naphthalenesulfonic acid naphthalene sulfonate formaldehyde condensates and alkyl sulfate Salt formaldehyde condensate / alkyl sulfate ester salt) is 97 / 3-50 / 50, a dispersant for gypsum slurry,
(2) The gypsum slurry dispersant, gypsum slurry containing water and gypsum, and (3) gypsum slurry prepared by mixing the gypsum slurry dispersant, kneaded water, gypsum and foam. The present invention relates to a method for producing a gypsum board including a step of preparing a gypsum board using a slurry.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In general, alkyl sulfate ester salt is difficult to use as a dispersant for gypsum slurry because of its excellent foaming property, but rather is used as an excellent foaming agent. Especially in the production of gypsum board, foam production Used as a foaming agent. However, as a result of various studies on the dispersion function of the alkyl sulfate salt by the present inventors, the alkyl sulfate ester salt can improve the wettability of the gypsum particles in a specific range of use amount. By producing a gypsum slurry in combination with a water-soluble polymer, the dispersibility of the water-soluble polymer can be improved without generating extra bubbles in the gypsum slurry, and in gypsum slurry in the production of gypsum board The present inventors have found a completely novel finding that stable bubbles can be formed when bubbles are mixed into the.
[0008]
The water-soluble polymer is at least one selected from the group consisting of naphthalene sulfonate formaldehyde condensate, melamine sulfonate formaldehyde condensate and polyalkylene glycol (meth) acrylate copolymer, and is a single polymer. However, among these, naphthalene sulfonate formaldehyde condensate having excellent dispersibility of gypsum is preferable.
[0009]
Commercial products of naphthalene sulfonate formaldehyde condensate include “Mighty 150” (manufactured by Kao Corporation), and commercial products of melamine sulfonate formaldehyde condensate include “Mighty 150 V-2” (Kao Corporation). As commercial products of polyalkylene glycol (meth) acrylate copolymer such as “manufactured”, etc., “FC-600S” (manufactured by Nippon Shokubai Co., Ltd.), “Mighty 21G” (manufactured by Borregard Co., Ltd.), and the like, respectively. It is done.
[0010]
In the alkyl sulfate salt, the alkyl group preferably has 8 to 22 carbon atoms, but the alkyl sulfate ester salt may further have an arylene group having 6 to 22 carbon atoms, preferably a phenylene group. An oxyethylene group (number of added moles: 1 to 30) may be added. The salt is preferably a monovalent metal salt, an ammonium salt, or an amino alcohol group.
[0011]
The alkyl sulfate ester salt is more preferably a polyoxyethylene alkyl sulfate ester salt, particularly preferably an alkyl group having 10 to 14 carbon atoms and an oxyethylene group having 1 to 5 added moles. Examples of such commercially available alkyl sulfate salts include “Emar 20C”, “Emar 27C”, “Emar D-3-D” (manufactured by Kao Corporation), and the like.
[0012]
The solid content weight ratio of the water-soluble polymer and the alkyl sulfate ester salt (water-soluble polymer / alkyl sulfate ester salt) is 97 / 3-50 / 50, preferably 95 / 5-60 / 40, more preferably 90 / 10-70 / 30. If the content of the alkyl sulfate salt is too small, sufficient wettability cannot be imparted to the gypsum powder in the kneaded water. Conversely, if the content is too large, coarse foam is generated when the kneaded water and gypsum are mixed. This is not preferable because the fluidity is lowered and the amount of bubbles in the gypsum slurry becomes excessive.
[0013]
The gypsum slurry containing the gypsum slurry dispersant of the present invention, water and gypsum can be obtained, for example, by mixing kneaded water composed of a gypsum slurry dispersant and water with gypsum. By using the slurry dispersant, gypsum and kneaded water can be mixed in a short time, and a gypsum slurry having good fluidity can be produced.
[0014]
The gypsum may be any of anhydrous, hemihydrate, dihydrate gypsum, etc., but preferably hemihydrate gypsum.
[0015]
The content of the dispersant for the gypsum slurry in the kneaded water is not particularly limited as long as the gypsum can be dispersed by a short time kneading and does not entrap excessive bubbles, but the amount of the water-soluble polymer is 100 parts by weight of gypsum. The solid content is preferably adjusted to 0.01 to 1.0 part by weight, more preferably 0.05 to 0.5 part by weight. The water content is preferably 50 to 70 parts by weight with respect to 100 parts by weight of gypsum.
[0016]
The water-soluble polymer and the alkyl sulfate ester salt may be mixed in advance and added as the dispersant of the present invention, or may be separately added to the kneaded water in the production process of the gypsum slurry. Further, the water-soluble polymer and the alkyl sulfate ester salt to be added may be in a liquid form or a powder form, but in consideration of measurement accuracy, a liquid form is preferred in any aspect.
[0017]
In this invention, you may add a well-known additive with a gypsum and kneading water as needed. Additives include dispersants, water-soluble polymers, AE agents, retarders, early strengtheners, accelerators, foaming agents, foaming agents, antifoaming agents, waterproofing agents, rust preventives, colorants, antifungal agents , Cracking reducing agents, polymer emulsions, swelling agents, fibers, dyes, pigments, and the like. These may be used alone or in combination of two or more.
[0018]
A gypsum slurry can be obtained by mixing the above-described gypsum, kneaded water, additives and the like using a pin mixer or the like.
[0019]
Furthermore, foam stability can be ensured satisfactorily by producing a gypsum board using the gypsum slurry obtained in the present invention. By mixing the kneaded water containing the dispersant according to the present invention with gypsum and foam in advance, a gypsum slurry with extremely good fluidity and foam stability in the slurry can be obtained, and the productivity and hardening of gypsum board The uniformity of bubbles in the later gypsum board can be improved.
[0020]
The foam is obtained by foaming the foaming agent, preferably an aqueous solution having a concentration of 0.01 to 3% by weight, more preferably 0.1 to 1% by weight. From the viewpoint of weight reduction, 2 to 200 parts by volume is preferable with respect to 100 parts by weight of gypsum. The relationship between the weight part of gypsum and the volume part of foam is calculated from the density of gypsum.
[0021]
The foaming agent is not particularly limited, but in the present invention, the formula (I):
R 1 O (AO) n CH 2 COOH (I)
[Wherein R 1 is an alkyl group or alkenyl group having 6 to 26 carbon atoms, preferably 6 to 12 carbon atoms, or R 2 — (C 6 H 4 ) —O— (R 2 is a hydrogen atom or 1 to 12 is an alkyl group of 12), AO is an oxyalkylene group having 2 to 3 carbon atoms, and n is an average added mole number of AO and represents a number of 1 to 100.
One or more selected from the group consisting of a compound represented by the formula: The salt of the compound represented by the formula (I) is composed of an alkali metal salt, an alkaline earth metal salt, an ammonium salt, and a mono-, di- and trialkylammonium salt having 2 to 8 carbon atoms which may have a hydroxyl group. One or more selected from the group is preferred, and alkali metal salts are more preferred.
[0022]
The compound represented by the formula (I) can be obtained, for example, by the reaction of an oxyalkylene adduct of alcohol and monochloroacetic acid, specifically, polyoxyalkylene hexyl ether acetic acid, polyoxyalkylene octyl ether acetic acid, poly Oxyalkylene lauryl ether acetic acid, polyoxyalkylene oleyl ether acetic acid, polyoxyalkylene cetyl ether acetic acid, polyoxyalkylene phenyl ether acetic acid, polyoxyalkylene methyl phenyl ether acetic acid, polyoxyalkylene nonyl phenol ether acetic acid, and sodium and potassium salts thereof Lithium salt, calcium salt, ammonium salt, mono-, di-, triethanolammonium salt and the like. Among these, alkali metal salts of polyoxyalkylene lauryl ether acetic acid and polyoxyalkylene nonyl phenol ether acetic acid are preferable from the viewpoint of foamability and water solubility.
[0023]
In the formula, the oxyalkylene group represented by AO is ethylene oxide and / or propylene oxide, and the addition form thereof may be any of single addition, random addition, and block addition. Ethylene oxide homoaddition polymers are preferred.
[0024]
N representing the average number of added moles of AO is 1 to 100, preferably 1 to 50, and more preferably 1 to 10. When n is less than 1, the foaming property is lowered, and when n is more than 100, the bubble stability tends to be lowered.
[0025]
Mixing of the kneaded water, gypsum, and foam can be performed using a pin mixer or the like, and the mixing time is not particularly limited as long as they are sufficiently mixed. The obtained gypsum slurry can be formed into a gypsum board by a conventional method, for example, referring to “gypsum board production” described in “Gypsum Lime Handbook” (edited by the Gypsum Lime Society), pages 322 to 324. it can.
[0026]
【Example】
Examples A-1 to 16 , Comparative Examples A-1 to 13, and Reference Examples A-1 to A-3
Gypsum slurry I: 1000 g of hemihydrate gypsum and 600 g of kneaded water obtained by mixing the water-soluble polymers and surfactants shown in Tables 1 and 2 according to the formulations described in Tables 3 and 4 are charged into a small pin mixer. The mixture was mixed at 300 r / min for 5 seconds to prepare a gypsum slurry.
Gypsum slurry II: 1000 g of hemihydrate gypsum and 450 g of kneaded water obtained by mixing the water-soluble polymer and surfactant shown in Tables 1 and 2 in accordance with the formulations shown in Tables 3 and 4 are charged into a small pin mixer. The mixture was mixed at 300 r / min for 5 seconds to prepare a gypsum slurry.
The fluidity of the obtained gypsum slurry was measured according to the method shown below. The results are shown in Tables 1 and 2.
[0027]
In addition, when preparing the gypsum slurry, a form in which a mixture of a water-soluble polymer and a surfactant is added to the kneaded water is “one solution”, and the water-soluble polymer and the surfactant are separately kneaded with water. The forms to be added to are shown in Tables 3 and 4 as “2 liquids” (the same applies to Table 5 below).
[0028]
[Evaluation of fluidity]
A cone having a diameter of 50 mm and a height of 50 mm is filled with gypsum slurry, and the spread (mm) after drawing is measured.
[0029]
[Table 1]
[Table 2]
[Table 3]
[Table 4]
From the comparison between Examples A-1 to 16 and Comparative Examples A-1 to A-13, the dispersant containing the water-soluble polymer and the alkyl sulfate ester salt according to the present invention is specified for the expression of the fluidity of the gypsum slurry. It can be seen that it is extremely effective when used in the range of the solid content ratio.
[0034]
Examples B-1 to 5 , Comparative Examples B-1 to B-5 and Reference Examples B-1 to B-3
30 ml of a 0.3% by weight aqueous solution of a foaming agent (polyoxyethylene (average added mole number = 3) lauryl sulfate sodium salt) was made into a foam of 600 ml by a foaming machine. 600 ml (30 g) of the obtained foam was mixed with 1000 g of hemihydrate gypsum (β type, density: 2.50 g / ml), and the surfactants and water-soluble polymers shown in Tables 1 and 2 in accordance with the formulation described in Table 5. The mixture was put into a 5 liter pin mixer together with 570 g of kneaded water obtained by mixing and mixed for 5 seconds to prepare a gypsum slurry mixed with bubbles, and its fluidity and foam stability were measured. The results are shown in Table 5. The evaluation method of fluidity is as described above.
[0035]
Furthermore, the obtained gypsum slurry is poured into a 10 cm long, 20 cm wide, 12 mm high formwork on which a gypsum board base paper has been laid, and then the gypsum board base paper is placed from above to form a sandwich so that no voids are formed. To do. The cured product that had been dried at 90 ° C. for 1 hour and demolded was further dried at 100 ° C. for 1 hour to obtain a gypsum board. When the obtained gypsum board was cut and the state of bubbles was observed, it was a gypsum board in which bubbles were uniformly dispersed.
[0036]
[Evaluation of foam stability]
The weight per fixed volume of the obtained gypsum slurry is weighed, and the specific gravity [weight (g) / volume (ml)] is used to measure the foam stability from the value obtained by the following formula. The larger the value obtained, the better the foam stability.
[0037]
[Expression 1]
[Table 5]
From the comparison between Examples B-1 to 5 and Comparative Examples B-1 to B-5, the water-soluble polymer and the alkyl sulfate ester according to the present invention were used in the expression of the fluidity of the gypsum board slurry and the foam stability in the slurry. It can be seen that a dispersant containing a salt is extremely effective.
[0040]
【The invention's effect】
INDUSTRIAL APPLICABILITY According to the present invention, a method capable of producing a gypsum slurry having good fluidity by mixing gypsum and kneaded water in a short time, and a gypsum that can be used for the production of such a gypsum slurry and that can satisfactorily ensure foam stability. A dispersing agent for slurry and a method for producing a gypsum board using such a gypsum slurry can be provided.
Claims (4)
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| JP2001201276A JP3719706B2 (en) | 2001-07-02 | 2001-07-02 | Dispersant for gypsum slurry |
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| JP2001201276A JP3719706B2 (en) | 2001-07-02 | 2001-07-02 | Dispersant for gypsum slurry |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20180000335A (en) * | 2017-12-20 | 2018-01-02 | 숭실대학교산학협력단 | Hybrid sspcm gypsum board for reduction of heating and cooling load in buildings and method for manufacturing the same |
| KR101841945B1 (en) * | 2017-12-26 | 2018-03-26 | 숭실대학교산학협력단 | Heat storage properties enhanced sspcm concrete and method for manufacturing the same |
| KR20190113738A (en) | 2017-02-03 | 2019-10-08 | 세키스이가가쿠 고교가부시키가이샤 | Admixture Compositions and Kits for Gypsum Compositions |
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| US9840066B2 (en) | 2005-06-09 | 2017-12-12 | United States Gypsum Company | Light weight gypsum board |
| US11338548B2 (en) | 2005-06-09 | 2022-05-24 | United States Gypsum Company | Light weight gypsum board |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190113738A (en) | 2017-02-03 | 2019-10-08 | 세키스이가가쿠 고교가부시키가이샤 | Admixture Compositions and Kits for Gypsum Compositions |
| KR20180000335A (en) * | 2017-12-20 | 2018-01-02 | 숭실대학교산학협력단 | Hybrid sspcm gypsum board for reduction of heating and cooling load in buildings and method for manufacturing the same |
| KR101869255B1 (en) * | 2017-12-20 | 2018-06-20 | 숭실대학교산학협력단 | Hybrid sspcm gypsum board for reduction of heating and cooling load in buildings and method for manufacturing the same |
| KR101841945B1 (en) * | 2017-12-26 | 2018-03-26 | 숭실대학교산학협력단 | Heat storage properties enhanced sspcm concrete and method for manufacturing the same |
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