JP3748362B2 - Foaming agent for gypsum slurry - Google Patents
Foaming agent for gypsum slurry Download PDFInfo
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- JP3748362B2 JP3748362B2 JP2000165985A JP2000165985A JP3748362B2 JP 3748362 B2 JP3748362 B2 JP 3748362B2 JP 2000165985 A JP2000165985 A JP 2000165985A JP 2000165985 A JP2000165985 A JP 2000165985A JP 3748362 B2 JP3748362 B2 JP 3748362B2
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
- C04B24/06—Carboxylic acids; Salts, anhydrides or esters thereof containing hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/42—Pore formers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、軽量石膏ボードの製造に適した気泡の安定性に優れる石膏スラリー用起泡剤に関する。
【０００２】
【従来の技術】
石膏ボード製造プラントでは、所定の配合に応じて、石膏、水、減水剤、硬化促進剤、接着剤等と石膏スラリー用起泡剤を用いて発泡させた泡沫とを同時に連続的にピンミキサーと称す混練機に投入して、１０〜２０秒程度の攪拌で排出する。その石膏スラリー用起泡剤として、アルコールにエチレンオキサイドを付加した硫酸化物が提案されている（特開平７−２９１７６１号公報、特開平６−２３９６７６号公報、特開平４−５０５６０１号公報等）が、機械的な剪断による破泡を生じやすく、排出された発泡石膏スラリーの比重が大きくなるため、その改善が望まれている。
【０００３】
【発明が解決しようとする課題】
本発明は、起泡性が高く、かつ機械的な剪断に対しても破泡し難い泡沫を生成することができる石膏スラリー用起泡剤を提供することを目的とする。
【０００４】
【課題を解決するための手段】
本発明の要旨は、式（Ｉ）：
Ｒ1 Ｏ（ＡＯ）n ＣＨ2 ＣＯＯＨ （Ｉ）
〔式中、Ｒ1 は炭素数６〜２６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種以上を含有してなる石膏スラリー用起泡剤に関する。
【０００５】
【発明の実施の形態】
本発明の石膏スラリー用起泡剤は、式（Ｉ）：
Ｒ1 Ｏ（ＡＯ）n ＣＨ2 ＣＯＯＨ （Ｉ）
〔式中、Ｒ1 は炭素数６〜２６のアルキル基もしくはアルケニル基、好ましくは炭素数６〜１２のアルキル基もしくはオレイル基、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種以上を含有する。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。
【０００６】
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。
【０００７】
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。
【０００８】
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。
【０００９】
式（Ｉ）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（以下、特に明示しない限り、「式（Ｉ）で表される化合物」と記載する）を含有する本発明の石膏スラリー用起泡剤が、起泡性が高く、かつ機械的な剪断に対しても破泡し難い泡沫を生成することができるのは、式（Ｉ）の化合物が無機イオンに安定なポリオキシアルキレン部と多価無機イオンで金属架橋しやすいカルボキシル基を有し、石膏や硬化促進剤から溶出される多価の無機イオンと接触することで、泡沫が安定化されるためと推測される。
【００１０】
本発明の石膏スラリー用起泡剤には、さらに、起泡剤としても知られる式（Ｉ）で表される化合物以外のアニオン系、ノニオン系等の各種界面活性剤が含有されていてもよい。かかる界面活性剤は、気泡安定性の観点から、アニオン系、特にはアルキル（炭素数６〜２６）硫酸エステル、ポリオキシアルキレン（炭素数２〜３、平均付加モル数０．１〜５０）アルキルエーテル（炭素数６〜２６）硫酸エステル、ポリオキシアルキレン（炭素数２〜３、平均付加モル数０．１〜５０）アリールエーテル（炭素数６〜１８）硫酸エステル及びそれらの塩からなる群より選ばれた１種以上が好ましい。かかる塩としては、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。本発明では、ポリオキシアルキレンアルキルエーテル（炭素数６〜１２）硫酸エステル塩が好ましく、かかるオキシアルキレン基は平均付加モル数が０．１〜１０のポリオキシエチレン基が好ましい。
【００１１】
本発明の石膏スラリー用起泡剤における、式（Ｉ）で表される化合物とそれ以外の界面活性剤との配合割合（式（Ｉ）で表される化合物／それ以外の界面活性剤）は、固形分重量比で、９９／１〜１／９９が好ましく、９９／１〜１０／９０がより好ましく、泡沫安定性の観点から、９０／１０〜５０／５０が特に好ましい。
【００１２】
本発明の起泡剤は、石膏組成物スラリーに直接起泡剤を混合して起泡する方法（ミックス法）や、予め泡沫として石膏組成物スラリー等と混合する方法（プレフォーム法）等のいずれでもよく、発泡方法についても特に限定されない。
【００１３】
本発明の起泡剤は、プレフォーム法の場合は、好ましくは０．０１〜３重量％水溶液、より好ましくは０．１〜１重量％水溶液として、これを発泡させて使用するのが、またミックス法の場合は、石膏に対して０．５〜１０重量％、好ましくは１〜３重量％を水と共に添加して攪拌するのが、安定性と経済性の面から好ましい。
【００１４】
なお、本発明の石膏スラリー用起泡剤には、減水剤、消泡剤、防水剤、硬化促進剤、硬化遅延剤、接着剤等の他の添加剤（材）が含有されていてもよい。
【００１５】
本発明の石膏スラリー用起泡剤は、軽量化や断熱を目的とした石膏硬化体に好適に使用することができるが、特に用途を限定するものではない。
【００１６】
【実施例】
実施例１〜６、比較例７〜１４、実施例１５〜２４
表１及び表２に示す起泡剤の０．２５重量％水溶液３０ｍｌを発泡機により攪拌し、６００ｍｌの泡沫とした。得られた泡沫６００ｍｌ（３０ｇ）を、半水石膏（β型、比重２．５０ｇ／ｍｌ）１０００ｇ及び減水剤を溶解した水５７０ｇとともに５リットル容のピンミキサーに投入して、１５秒間混合し、気泡が混入した石膏スラリーを得た。なお、減水剤としては、実施例２ｂでポリエーテル系減水剤「マイテイ２１Ｇ」（花王（株）製）を２ｇ（固形分）、実施例２ｂ以外の実施例及び比較例ではナフタレン系減水剤「マイテイ１５０Ｇ」（花王（株）製）を５ｇ（固形分）使用した。
【００１７】
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）〕を用いた下記式により得られた値から、泡沫の安定性を評価した。結果を表１及び表２に示す。
【００１８】
【数１】
【表１】
【表２】
以上の結果から、実施例１〜６の起泡剤は生成する泡沫の安定性が高く、比較例７〜１４の起泡剤（界面活性剤）は、単独では泡沫の安定性に欠けるが、本発明の起泡剤と併用することにより、実施例１５〜２４で示すように、泡沫の安定性を著しく向上することが分かる。
【００２２】
【発明の効果】
本発明により、安定性した起泡性を有し、かつ機械的な剪断に対しても破泡し難い泡沫を生成することができる石膏スラリー用起泡剤を提供することが可能となった。従って、本発明の起泡剤を用いることにより、起泡剤量の低減や石膏ボード比重の設定が容易となる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foaming agent for gypsum slurry that is suitable for the production of lightweight gypsum board and has excellent bubble stability.
[0002]
[Prior art]
In a gypsum board manufacturing plant, gypsum, water, a water reducing agent, a curing accelerator, an adhesive and the foam foamed using a foaming agent for gypsum slurry are continuously mixed with a pin mixer according to a predetermined composition. It is put into a kneader called and discharged with stirring for about 10 to 20 seconds. As the foaming agent for gypsum slurry, sulfates obtained by adding ethylene oxide to alcohol have been proposed (JP-A-7-2911761, JP-A-6-239676, JP-A-4-505601, etc.). Since foam breakage due to mechanical shearing is likely to occur, and the specific gravity of the discharged foamed gypsum slurry increases, improvement thereof is desired.
[0003]
[Problems to be solved by the invention]
An object of this invention is to provide the foaming agent for gypsum slurries which can produce the foam which has high foamability and is hard to break even with mechanical shearing.
[0004]
[Means for Solving the Problems]
The subject of the present invention is 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 or R 2 — (C 6 H 4 ) —O— (R 2 is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms). A group represented by the formula, 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.
The foaming agent for gypsum slurry containing 1 or more types selected from the group which consists of the compound represented by these, and its salt.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The foaming agent for gypsum slurry of the present invention has the formula (I):
R 1 O (AO) n CH 2 COOH (I)
[Wherein, R 1 represents an alkyl group or alkenyl group having 6 to 26 carbon atoms, preferably an alkyl group or oleyl group having 6 to 12 carbon atoms, or R 2 — (C 6 H 4 ) —O— (where R 2 represents A hydrogen atom or an alkyl group having 1 to 12 carbon atoms), AO represents an oxyalkylene group having 2 to 3 carbon atoms, and n represents an average added mole number of AO and represents a number of 1 to 100.
Containing at least one 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.
[0006]
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.
[0007]
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.
[0008]
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.
[0009]
The present invention containing one or more selected from the group consisting of the compound represented by formula (I) and a salt thereof (hereinafter referred to as “compound represented by formula (I) unless otherwise indicated)” The foaming agent for gypsum slurry of the present invention is capable of producing a foam that has high foaming properties and is difficult to break even with mechanical shearing, because the compound of formula (I) is stable to inorganic ions. It is presumed that the foam is stabilized by contacting the polyoxyalkylene moiety and polyvalent inorganic ions, which have a carboxyl group that easily undergoes metal crosslinking, and coming into contact with polyvalent alkylene ions that are eluted from gypsum and curing accelerators. The
[0010]
The foaming agent for gypsum slurry of the present invention may further contain various anionic and nonionic surfactants other than the compound represented by the formula (I), which is also known as a foaming agent. . Such surfactants are anionic, particularly alkyl (6 to 26 carbon atoms) sulfate ester, polyoxyalkylene (2 to 3 carbon atoms, average added mole number 0.1 to 50) alkyl from the viewpoint of bubble stability. Ether (carbon number 6 to 26) sulfate ester, polyoxyalkylene (carbon number 2 to 3, average added mole number 0.1 to 50) aryl ether (carbon number 6 to 18) sulfate ester and salts thereof One or more selected are preferred. Such salts include one or more selected from the group consisting of alkali metal salts, alkaline earth metal salts, ammonium salts, and mono-, di- and trialkyl ammonium salts having 2 to 8 carbon atoms which may have a hydroxyl group. Are preferred, and alkali metal salts are more preferred. In the present invention, a polyoxyalkylene alkyl ether (carbon number 6 to 12) sulfate ester salt is preferable, and the oxyalkylene group is preferably a polyoxyethylene group having an average addition mole number of 0.1 to 10.
[0011]
In the foaming agent for gypsum slurry of the present invention, the blending ratio of the compound represented by formula (I) and the other surfactant (compound represented by formula (I) / the other surfactant) is The solid content weight ratio is preferably 99/1 to 1/99, more preferably 99/1 to 10/90, and particularly preferably 90/10 to 50/50 from the viewpoint of foam stability.
[0012]
The foaming agent of the present invention is a method of mixing a foaming agent directly with a gypsum composition slurry (foaming method), a method of mixing with a gypsum composition slurry or the like in advance as a foam (preform method), etc. Either method may be used, and the foaming method is not particularly limited.
[0013]
In the case of the preform method, the foaming agent of the present invention is preferably used in a foamed form of 0.01 to 3% by weight aqueous solution, more preferably 0.1 to 1% by weight aqueous solution. In the case of the mix method, it is preferable from the standpoint of stability and economy that 0.5 to 10% by weight, preferably 1 to 3% by weight, is added to water and stirred together with water.
[0014]
The foaming agent for gypsum slurry of the present invention may contain other additives (materials) such as a water reducing agent, an antifoaming agent, a waterproofing agent, a curing accelerator, a curing retarder, and an adhesive. .
[0015]
Although the foaming agent for gypsum slurry of this invention can be used conveniently for the gypsum hardened | cured material aiming at weight reduction and heat insulation, a use is not specifically limited.
[0016]
【Example】
Examples 1-6, Comparative Examples 7-14, Examples 15-24
30 ml of a 0.25 wt% aqueous solution of the foaming agent shown in Tables 1 and 2 was stirred with a foaming machine to form 600 ml of foam. 600 ml (30 g) of the obtained foam was put into a 5-liter pin mixer together with 1000 g of hemihydrate gypsum (β type, specific gravity 2.50 g / ml) and 570 g of water in which a water reducing agent was dissolved, and mixed for 15 seconds. A gypsum slurry mixed with bubbles was obtained. As the water reducing agent, 2 g (solid content) of the polyether type water reducing agent “Mighty 21G” (manufactured by Kao Corporation) in Example 2b, and in the examples and comparative examples other than Example 2b, the naphthalene type water reducing agent “ 5 g (solid content) of “Mighty 150G” (manufactured by Kao Corporation) was used.
[0017]
The weight per fixed volume of the obtained gypsum slurry was weighed, and the foam stability was evaluated from the value obtained by the following formula using the specific gravity [weight (g) / volume (ml)]. The results are shown in Tables 1 and 2.
[0018]
[Expression 1]
[Table 1]
[Table 2]
From the above results, the foaming agents of Examples 1 to 6 have high foam stability, and the foaming agents (surfactants) of Comparative Examples 7 to 14 alone lack foam stability. By using together with the foaming agent of this invention, it turns out that stability of a foam improves remarkably as shown in Examples 15-24.
[0022]
【The invention's effect】
According to the present invention, it is possible to provide a foaming agent for a gypsum slurry that has a stable foaming property and can generate foam that is difficult to break even with mechanical shearing. Therefore, by using the foaming agent of the present invention, it becomes easy to reduce the amount of foaming agent and set the specific gravity of the gypsum board.
Claims (2)
Ｒ1 Ｏ（ＡＯ）n ＣＨ2 ＣＯＯＨ （Ｉ）
〔式中、Ｒ1 は炭素数６〜２６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種以上を含有してなる石膏スラリー用起泡剤。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 or R 2 — (C 6 H 4 ) —O— (R 2 is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms). A group represented by the formula, 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.
A foaming agent for a gypsum slurry comprising one or more selected from the group consisting of a compound represented by the formula:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000165985A JP3748362B2 (en) | 2000-06-02 | 2000-06-02 | Foaming agent for gypsum slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000165985A JP3748362B2 (en) | 2000-06-02 | 2000-06-02 | Foaming agent for gypsum slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001340744A JP2001340744A (en) | 2001-12-11 |
| JP3748362B2 true JP3748362B2 (en) | 2006-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000165985A Expired - Fee Related JP3748362B2 (en) | 2000-06-02 | 2000-06-02 | Foaming agent for gypsum slurry |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3748362B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI265087B (en) | 2002-03-27 | 2006-11-01 | Yoshino Gypsum Co | Plaster board and method of fabricating the plaster board |
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2000
- 2000-06-02 JP JP2000165985A patent/JP3748362B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001340744A (en) | 2001-12-11 |
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