JP2003020262A - Dispersant for gypsum slurry - Google Patents
Dispersant for gypsum slurryInfo
- Publication number
- JP2003020262A JP2003020262A JP2001201276A JP2001201276A JP2003020262A JP 2003020262 A JP2003020262 A JP 2003020262A JP 2001201276 A JP2001201276 A JP 2001201276A JP 2001201276 A JP2001201276 A JP 2001201276A JP 2003020262 A JP2003020262 A JP 2003020262A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- gypsum slurry
- water
- dispersant
- slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[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。TECHNICAL FIELD 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】[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。2. Description of the Related Art Surfactants play a role as a dispersant in the production of gypsum slurry used for gypsum board and the like.
【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５３−９５３８１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。Attempts have been made to impart fluidity to the gypsum slurry by using a series of water-soluble polymers, which are superior in dispersibility to surfactants, and surfactants together. JP-A-52-8027 discloses a fluid gypsum plaster composition containing a sulfonic acid-based cement dispersant and a phosphoric acid ester-based surfactant, and JP-A-53-95381 discloses β-naphthalene. A slurry containing a sulfonic acid formaldehyde condensate and a nonionic surfactant having a specific structure is disclosed. However, particularly in the case of producing gypsum board, when gypsum and kneading water are kneaded in an extremely short time, and proper fluidity must be imparted to the gypsum slurry, the dispersibility of the conventionally disclosed method can be improved. Is insufficient.
【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。On the other hand, in the process of gypsum board, in many cases, foam is formed independently of the kneading water, and the kneading water is mixed with the gypsum and the foam to give the gypsum slurry fluidity,
A method of mixing appropriate bubbles into the gypsum slurry has been studied. As a foaming agent for forming this foam, for example, JP-A-7-291761 discloses a foaming agent for producing a light weight 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, kneading water containing a naphthalenesulfonic acid formaldehyde condensate, which is a particularly excellent dispersibility of gypsum, has a strong foam breaking property, and when mixed with gypsum and foam, bubbles derived from foam become unstable. .
【０００５】[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。The object of the present invention is to mix gypsum and kneading water in a short time to produce a gypsum slurry having good fluidity and to improve foam stability. Disclosed is a gypsum slurry dispersant that can be secured, and a method for producing a gypsum slurry and a gypsum board using such a dispersant.
【０００６】[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、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種以上の水溶性高分子と、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、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）が９
７／３〜５０／５０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。Means for Solving the Problems The present invention is selected from the group consisting of (1) a naphthalene sulfonate formaldehyde condensate, a melamine sulfonate formaldehyde condensate and a polyalkylene glycol (meth) acrylate copolymer. A dispersant for a gypsum slurry containing at least one water-soluble polymer and an alkyl sulfate ester salt, wherein the solid content weight ratio of the water-soluble polymer and the alkyl sulfate ester salt (water-soluble polymer / alkyl sulfate ester salt ) Is 9
A dispersant for gypsum slurry that is 7/3 to 50/50,
(2) The gypsum slurry prepared by mixing the dispersant for gypsum slurry, gypsum slurry containing water and gypsum, and (3) the dispersant for gypsum slurry, kneading water, gypsum and foam to obtain gypsum slurry. The present invention relates to a gypsum board manufacturing method having a step of preparing a gypsum board using a slurry.
【０００７】[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。BEST MODE FOR CARRYING OUT THE INVENTION In general, an alkyl sulfate ester salt is difficult to use as a dispersant for a gypsum slurry because of its excellent foaming property, and is rather used as an excellent foaming agent. Is used as a foaming agent for producing foam. However, as a result of various studies by the inventors of the present invention on the dispersing function of the alkyl sulfate ester salt, the alkyl sulfate ester salt can improve the wettability of the gypsum particles in the use amount within a specific range, and further, By producing the gypsum slurry in combination with the water-soluble polymer, it is possible to improve the dispersibility of the water-soluble polymer without generating extra bubbles in the gypsum slurry, and in the gypsum slurry in the production of gypsum board We have found a completely new finding that stable bubbles can be formed when bubbles are mixed in.
【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。The water-soluble polymer is at least one selected from the group consisting of a naphthalene sulfonate formaldehyde condensate, a melamine sulfonate formaldehyde condensate and a polyalkylene glycol (meth) acrylate copolymer, and is used alone. Although it may be a polymer or a combination of two or more kinds, among these, a naphthalene sulfonate formaldehyde condensate having excellent dispersibility of gypsum is preferable.
【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−６
００Ｓ」（（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。Commercially available products of naphthalene sulfonate formaldehyde condensate such as "Mighty 150" (manufactured by Kao Corporation) and commercial products of melamine sulfonate formaldehyde condensate "Mighty 150V-2".
Commercially available products of polyalkylene glycol (meth) acrylate copolymers such as (manufactured by Kao Corporation) are “FC-6.
00S "(manufactured by Nippon Shokubai Co., Ltd.)," Mighty 21G "
(Manufactured by Boleguard Co., Ltd.) and the like.
【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。In the alkyl sulfate ester 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 (the number of added moles: 1 to 30) may be added to the group. The salt is preferably a monovalent metal salt, ammonium salt or amino alcohol group.
【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。The alkyl sulfate ester salt is more preferably a polyoxyethylene alkyl sulfate ester salt,
In particular, it is more preferable that the alkyl group has 10 to 14 carbon atoms and the oxyethylene group has 1 to 5 added moles. Commercially available products of such alkyl sulfate ester salts include "Emar 20C", "Emar 27C", and "Emar D-".
3-D "(above, Kao Corporation make) etc. are mentioned.
【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。The solid content weight ratio of the water-soluble polymer to the alkyl sulfate ester salt (water-soluble polymer / alkyl sulfate ester salt) is 97/3 to 50/50, preferably 95/5 to
It is 60/40, more preferably 90/10 to 70/30. When the content of the alkyl sulfate ester salt is too small, it is not possible to impart sufficient wettability to the gypsum powder in the kneading water, and conversely, when the content is too large, coarse bubbles are generated when the kneading water and gypsum are mixed. Is involved, and the fluidity decreases,
The amount of bubbles in the gypsum slurry is excessive, which is not preferable.
【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。The gypsum slurry dispersant of the present invention, gypsum slurry containing water and gypsum can be obtained, for example, by mixing kneading water composed of a dispersant for gypsum slurry and water with gypsum. By using the dispersant for gypsum slurry of the present invention, gypsum and kneading water can be mixed in a short time, and a gypsum slurry having good fluidity can be produced.
【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。The gypsum may be anhydrous, hemihydrate, dihydrate gypsum, etc., but hemihydrate gypsum is preferred.
【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０．０
５〜０．５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。The content of the gypsum slurry dispersant in the kneading water is not particularly limited as long as it can disperse the gypsum in a short time kneading and does not sprinkle excessive bubbles, but the amount of the water-soluble polymer is gypsum. With respect to 100 parts by weight, the solid content is preferably 0.01 to 1.0 part by weight, more preferably 0.0.
It is desirable to adjust the amount to be 5 to 0.5 parts by weight. The content of water is 100 parts by weight of gypsum,
50 to 70 parts by weight is preferable.
【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。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 added separately in the kneading water in the step of producing the gypsum slurry. Further, the water-soluble polymer and the alkyl sulfate ester salt to be added may be in liquid form or powder form, but liquid form is preferable in any of the aspects in consideration of measurement accuracy.
【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。In the present invention, known additives may be added, if necessary, together with gypsum and kneading water. As additives, dispersants, water-soluble polymers, AE agents, retarders, early-strength agents, accelerators, foaming agents, foaming agents, defoaming agents, waterproofing agents, rust-preventing agents, coloring agents, antifungal agents. , Crack reducing agents, polymer emulsions, swelling agents, fibers, dyes, pigments and the like, and these may be used alone or in combination of two or more kinds.
【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。A gypsum slurry can be obtained by mixing the above-mentioned gypsum, kneading water, additives and the like using a pin mixer or the like.
【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。Further, by producing a gypsum board using the gypsum slurry obtained in the present invention, it is possible to ensure good stability of foam. By previously mixing the kneading water containing the dispersant according to the present invention with gypsum and foam,
It is possible to obtain a gypsum slurry having extremely good fluidity and foam stability in the slurry, and it is possible to improve the productivity of the gypsum board and the uniformity of air bubbles in the gypsum board after hardening.
【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。The foam is a foaming agent, preferably from 0.01 to
An aqueous solution having a concentration of 3% by weight, more preferably 0.1 to 1% by weight, is obtained by foaming the aqueous solution, and the addition volume of the foam is 2 with respect to 100 parts by weight of gypsum from the viewpoint of weight saving of the slurry. ˜200 parts by volume is preferred. The relationship between the weight part of gypsum and the volume part of foam is calculated from the density of gypsum.
【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 −（Ｃ
6 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。The foaming agent is not particularly limited, but in the present invention, the formula (I): R 1 O (AO) n CH 2 COOH (I) [In the formula, R 1 has 6 to 26 carbon atoms, preferably 6-carbon
12 alkyl or alkenyl groups or R 2- (C
6 H 4 ) —O— (R 2 is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms), AO is 2 to 3 carbon atoms.
An oxyalkylene group, and n represents the average number of moles of AO added and represents a number of 1 to 100], and at least one selected from the group consisting of salts thereof. Formula (I)
The salt of the compound represented by is selected from the group consisting of alkali metal salts, alkaline earth metal salts, ammonium salts and mono-, di- and trialkylammonium salts having 2 to 8 carbon atoms which may have a hydroxyl group. One or more are preferred, and alkali metal salts are more preferred.
【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。The compound represented by the formula (I) can be obtained, for example, by reacting an oxyalkylene adduct of alcohol with monochloroacetic acid, and specifically, polyoxyalkylene hexyl ether acetic acid, polyoxyalkylene octyl ether. Acetic acid, polyoxyalkylene 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 nonylphenol ether acetic acid, and their sodium salts , Potassium salt, lithium salt, calcium salt,
Examples thereof include ammonium salts, mono-, di-, triethanol ammonium salts and the like. Among these, alkali metal salts of polyoxyalkylene lauryl ether acetic acid and polyoxyalkylene nonylphenol ether acetic acid are preferable from the viewpoint of foamability and water solubility.
【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。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, but the foaming property. Considering the above, an ethylene oxide homo-addition polymer is preferable.
【００２４】ＡＯの平均付加モル数を表すｎは、１〜１
００、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。N representing the average number of moles of AO added is 1 to 1
00, preferably 1 to 50, more preferably 1 to 10. When n is less than 1, foaming property is lowered, and when n is more than 100, bubble stability tends to be lowered.
【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。The kneading water, gypsum and foam can be mixed 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, by referring to “Gypsum board production” described in “Gypsum lime handbook” (edited by Gypsum Lime Society), pages 322 to 324. it can.
【００２６】[0026]
【実施例】実施例Ａ−１〜１９、比較例Ａ−１〜１３
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。[Examples] Examples A-1 to 19 and Comparative Examples A-1 to 13 Gypsum slurry I: 1000 g of hemihydrate gypsum and the water-soluble polymers and surfactants shown in Tables 1 and 2 are shown in Tables 3 and 4. 600 g of kneading water obtained by mixing in accordance with the prescription of 1. was put into a small pin mixer and mixed for 5 seconds at 300 r / min to prepare a gypsum slurry. Gypsum slurry II: 1000 g of hemihydrate gypsum, 450 g of kneading water obtained by mixing the water-soluble polymer and the surfactant shown in Tables 1 and 2 according to the prescriptions shown in Tables 3 and 4 were put into a small pin mixer. And 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 described below. The results are shown in Tables 1 and 2.
【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）。When the gypsum slurry is prepared, a mixture of a water-soluble polymer and a surfactant is added in advance to the kneading water in the "1 liquid", and the water-soluble polymer and the surfactant are separated. The form of adding to the kneading water as “2 liquid” is shown in Tables 3 and 4.
(The same applies to Table 5 below).
【００２８】〔流動性の評価〕直径５０ｍｍ×高さ５０
ｍｍ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。[Evaluation of fluidity] Diameter 50 mm × height 50
A mm cone is filled with gypsum slurry and the spread (mm) after drawing is measured.
【００２９】[0029]
【表１】 [Table 1]
【００３０】[0030]
【表２】 [Table 2]
【００３１】[0031]
【表３】 [Table 3]
【００３２】[0032]
【表４】 [Table 4]
【００３３】実施例Ａ−１〜１９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。Examples A-1 to 19 and Comparative Examples A-1 to 13
From the contrast of, the expression of the fluidity of the gypsum slurry is extremely effective when the dispersant containing the water-soluble polymer and the alkyl sulfate ester salt according to the present invention is used in a specific solid content ratio range. I understand.
【００３４】実施例Ｂ−１〜８、比較例Ｂ−１〜５
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。Examples B-1 to 8 and Comparative Examples B-1 to 5 30 ml of a 0.3 wt% aqueous solution of a foaming agent (polyoxyethylene (average added mole number = 3) lauryl sulfate sodium salt) was used in a foaming machine. To 600 ml of foam. 600 ml (30 g) of the obtained foam was added to hemihydrate gypsum (β type,
Density: 2.50 g / ml) 1000 g, and the surfactants and water-soluble polymers shown in Tables 1 and 2 were mixed with 570 g of kneading water obtained by mixing in accordance with the formulation shown in Table 5 into a 5-liter pin mixer. Then, the mixture was mixed for 5 seconds to prepare a gypsum slurry containing air bubbles, and its fluidity and foam stability were measured. The results are shown in Table 5. The liquidity evaluation method is as described above.
【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１２
ｍｍ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。Furthermore, the obtained gypsum slurry was laid on a base paper for gypsum board, and the length was 10 cm, the width was 20 cm, and the height was 12 cm.
Pour into a mm frame, and place the gypsum board base paper from above, and mold into a sandwich so that voids do not enter.
The cured product that has been demolded by drying at 90 ° C for 1 hour is further heated at 100 ° C.
A gypsum board was obtained by drying for 1 hour. When the obtained gypsum board was cut and the state of bubbles was observed,
It was a gypsum board in which air bubbles were uniformly dispersed.
【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。[Evaluation of Foam Stability] The weight of the obtained gypsum slurry per constant volume was measured to determine the specific gravity [weight (g)
/ Volume (ml)], and the stability of the foam is measured from the value obtained by the following formula. The larger the obtained value,
Foam stability is good.
【００３７】[0037]
【数１】 [Equation 1]
【００３８】[0038]
【表５】 [Table 5]
【００３９】実施例Ｂ−１〜８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。From the comparison between Examples B-1 to 8 and Comparative Examples B-1 to 5, it was confirmed that the water-soluble polymer according to the present invention was found to exhibit the fluidity of the slurry for gypsum board and the foam stability in the slurry. It can be seen that the dispersant containing the alkyl sulfate ester salt is extremely effective.
【００４０】[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。According to the present invention, a method of producing a gypsum slurry having good fluidity by mixing gypsum and kneading water in a short time, and stability of foam which can be used for producing such a gypsum slurry. It is possible to provide a gypsum slurry dispersant that can be well secured and a method for manufacturing a gypsum board using the gypsum slurry.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０４Ｂ 38/10 Ｃ０４Ｂ 38/10 Ａ Ｂ Ｄ Ｆ Ｃ０８Ｋ 5/42 Ｃ０８Ｋ 5/42 Ｃ０８Ｌ 33/14 Ｃ０８Ｌ 33/14 61/18 61/18 61/32 61/32 //(Ｃ０４Ｂ 28/14 Ｃ０４Ｂ 24:22 Ｂ 24:22 24:30 Ｃ 24:30 24:26 Ｅ 24:26 24:16 24:16 24:32 Ａ 24:32 24:28 Ａ 24:28） 103:40 103:40 111:40 111:40 (72)発明者 藤田 修一 和歌山市湊1334番地 花王株式会社研究所 内 Ｆターム(参考） 4G012 PB22 PB25 PB31 PB34 PB35 PB36 4G019 MA01 MA09 4J002 CC121 CC241 EV246 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 7 Identification code FI theme code (reference) C04B 38/10 C04B 38/10 A B D F C 08K 5/42 C08K 5/42 C08L 33/14 C08L 33 / 14 61/18 61/18 61/32 61/32 // (C04B 28/14 C04B 24:22 B 24:22 24:30 C 24:30 24:26 E 24:26 24:16 24:16 24: 32 A 24:32 24:28 A 24:28) 103: 40 103: 40 111: 40 111: 40 (72) Inventor Shuichi Fujita 1334 Minato Minato, Wakayama City Kao Corporation Research Center F Term (reference) 4G012 PB22 PB25 PB31 PB34 PB35 PB36 4G019 MA01 MA09 4J002 CC121 CC241 EV246
Claims (4)
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種以上の水溶性高分
子と、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、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）が９７／３〜５０／５０である石膏スラリ
ー用分散剤。1. A water-soluble polymer selected from the group consisting of a naphthalene sulfonate formaldehyde condensate, a melamine sulfonate formaldehyde condensate and a polyalkylene glycol (meth) acrylate copolymer, and an alkylsulfate. A gypsum slurry dispersant containing an ester salt, wherein 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 to 50/50. Dispersant for gypsum slurry.
に、オキシエチレン基が付加されている請求項１記載の
石膏スラリー用分散剤。2. The dispersant for gypsum slurry according to claim 1, wherein an oxyethylene group is added to the alkyl group of the alkyl sulfate ester salt.
散剤、水及び石膏を含有した石膏スラリー。3. A gypsum slurry containing the gypsum slurry dispersant according to claim 1 or 2, water and gypsum.
散剤を含有した混練水、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。4. A step of preparing a gypsum board by mixing the kneading water containing the dispersant for gypsum slurry according to claim 1 or 2, gypsum and foam to prepare a gypsum slurry and using the obtained gypsum slurry. A method for manufacturing a gypsum board having the following.
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| JP2001201276A JP3719706B2 (en) | 2001-07-02 | 2001-07-02 | Dispersant for gypsum slurry |
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