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WO2005087815A1 - Inhibiteur d’entartrage - Google Patents

Inhibiteur d’entartrage Download PDF

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Publication number
WO2005087815A1
WO2005087815A1 PCT/JP2005/003938 JP2005003938W WO2005087815A1 WO 2005087815 A1 WO2005087815 A1 WO 2005087815A1 JP 2005003938 W JP2005003938 W JP 2005003938W WO 2005087815 A1 WO2005087815 A1 WO 2005087815A1
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Prior art keywords
hydroxyl group
group
scale adhesion
silyl group
polymerization
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PCT/JP2005/003938
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English (en)
Japanese (ja)
Inventor
Kazuyuki Somemiya
Kunio Kamata
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Kuraray Co Ltd
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Kuraray Co Ltd
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Priority to JP2006510933A priority Critical patent/JP4554602B2/ja
Publication of WO2005087815A1 publication Critical patent/WO2005087815A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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  • the present invention relates to a scale adhesion inhibitor. More specifically, the present invention relates to a scale adhesion preventive agent that is applied in advance to the inside of a polymerization reactor in order to prevent the generation of scale when polymerizing a butyl monomer.
  • Patent Reference 3 For the purpose of shortening the time required to apply the scale adhesion inhibitor to the inside of the polymerization reactor, a method using a steam stream for applying the scale adhesion inhibitor has been proposed (Patent Reference 3). According to this method, a coating can be applied to the reactor surface in a closed polymerization system without opening the reactor.
  • the scale adhesion inhibitor used in this method must be soluble in an aqueous medium.
  • a scale adhesion inhibitor soluble in an aqueous alkaline solution a modified polyvinyl alcohol containing a silyl group in the molecule is used. (Patent Document 4), and a product having a deposition inhibitory activity that can be formed by condensation of effective 1 naphthol with formaldehyde (Patent Document 5) are known.
  • Patent Document 1 JP-A-62-201832
  • Patent Document 2 JP-A-54-7487
  • Patent Document 3 JP-A-55-36288
  • Patent Document 4 JP-A-59-184208
  • Patent Document 5 JP-A-57-164107
  • An object of the present invention is to preliminarily coat a vinyl monomer inside a polymerization reactor when producing a vinyl polymer by (co) polymerizing a vinyl monomer alone or with another copolymer component. Accordingly, an object of the present invention is to provide a scale adhesion preventing agent exhibiting an excellent scale adhesion prevention effect. Means for solving the problem
  • the present inventors have conducted intensive studies and as a result, it has been found that an aqueous alkali solution containing a butyl alcohol-based polymer having a specific functional group and a phenolic hydroxyl group-containing compound exhibits excellent effects as a scale adhesion inhibitor. This led to the completion of the present invention.
  • the present invention provides a silyl group-containing butyl alcohol-based polymer (A) having a silyl group content of 0.1 to 10 mol% represented by the following general formula (1) and a phenolic hydroxyl It is a scale adhesion inhibitor containing a group-containing compound (B) and having an aqueous pH of 9 or more.
  • the phenolic hydroxyl group-containing compound (B) is preferably a compound in which a hydroxyl group is bonded to a naphthalene ring, particularly preferably naphthol.
  • the phenolic hydroxyl group-containing compound (B) is a condensation product of an aldehyde with a phenolic hydroxyl group-containing compound. Furthermore, the compounding weight ratio (AZB) of the silyl group-containing butyl alcohol polymer (A) and the phenolic hydroxyl group-containing compound (B) is S1Z99-99Z1, and the solid concentration is 0.01-20% by weight. It is also preferable that
  • the scale adhesion inhibitor of the present invention can be used for producing a vinyl polymer by polymerizing a butyl monomer alone in an aqueous medium and polymerizing it alone or copolymerizing it with another copolymerization component. Is applied beforehand to the inside of the polymerization reactor. As a result, a film is formed on the inner wall of the polymerization reactor, and by the action of this film, the scale adhering to the inner wall of the polymerization reactor can be suppressed to an extremely small amount. Further, since the scale adhesion inhibitor of the present invention is soluble in an aqueous medium, it can be easily applied to the inside of the polymerization reactor in a short time using a steam stream.
  • silyl group-containing vinyl alcohol polymer (A) (hereinafter sometimes abbreviated as silyl group-containing PVA (A), and an unmodified vinyl alcohol polymer is referred to as PVA
  • the degree of polymerization is not particularly limited, but is usually 100 to 8000, preferably 150 to 6000, and more preferably 200 to 5000.
  • the degree of polymerization of the sidyl group-containing PVA is measured according to IS K6726. That is, it can be determined from the intrinsic viscosity measured in water at 30 ° C. after saponification and purification of the silyl group-containing PVA (A).
  • the degree of polymerization of the silyl group-containing PVA (A) is less than 100, the strength of the film formed on the inner wall of the polymerization reactor may decrease. If the degree of polymerization is greater than 8000, the viscosity of the alkaline aqueous solution may be too high, and the viscosity stability may decrease.
  • the degree of saponification of the silyl group-containing PVA (A) is usually 80- 99.9 9 mole 0/0, preferably 85 to 99.95 mol 0/0, more Preferably it is 90-99.9 mol%.
  • the saponification degree of the silyl group-containing PVA (A) is measured according to JIS K6726. It was done.
  • the saponification degree of the silyl group-containing PVA (A) is less than 80 mol%, the water resistance of the coating formed on the inner wall of the polymerization reactor may be reduced. Further, it is difficult to industrially produce PVA (A) containing a silyl group having a saponification degree exceeding 99 mol%.
  • PVA can be produced by saponifying a vinyl ester polymer, and as the vinyl ester monomer that can be used in the production thereof, there are butyl formate, vinyl acetate, butyl propionate, and valerin. Examples thereof include acid bur, caproic bur, lauric bur, stearic bur, benzoic bur, vivalic bur, versatic bur and the like.
  • a vinyl ester monomer that can be particularly preferably used is vinyl acetate.
  • a known polymerization method such as a solution polymerization method, a bulk polymerization method, a suspension polymerization method, and an emulsion polymerization method is used.
  • an alcohol such as methanol is used.
  • a solution polymerization method using a solvent is used.
  • the polymerization temperature is no particular limitation on the polymerization temperature, but it is usually arbitrarily selected within the range of 0 to 150 ° C.
  • Various known methods can be used as a method for saponifying a butyl ester polymer.
  • sodium alcoholate or sodium hydroxide is used in an alcohol solvent (which may contain a small amount of water).
  • a method of saponification using an alkaline substance such as potassium hydroxide.
  • the silyl group-containing PVA (A) used in the present invention contains a silyl group represented by the following general formula (1) in an amount of 0.1 to 10 mol%.
  • the content of the silyl group is preferably 0. a 2-8 mole 0/0, more preferably 0. 3-6 the molar 0/0, particularly preferably at 0.5 5 5 mole 0/0 . If the content of the silyl group is less than 0.1 mol%, the effect of preventing scale adhesion is undesirably reduced. If the amount is more than 10 mol%, the viscosity of the alkaline aqueous solution becomes extremely high, which is not preferable because the handling and the properties are deteriorated. [0018] [Formula 2]
  • R 1 represents a hydrogen atom or a hydrocarbon group having 8 or less carbon atoms which may have a substituent
  • R 2 has a substituent containing oxygen!
  • / represents an alkoxyl or acyloxyl group having 1 to 40 carbon atoms
  • n represents an integer of 0 to 2
  • m represents an integer of 0 to 3, provided that the sum of n and m is 3 or less
  • X is hydrogen Represents an atom or a monovalent metal atom.
  • the silyl group represented by the general formula (1) is directly bonded to the side chain or the terminal of the PVA, and is linked to the PVA via a linking group which is not cleaved at the time of saponification of the vinyl ester polymer.
  • A is bonded to the side chain or terminal of A.
  • a vinyl ester-based monomer and an olefinic unsaturated monomer containing a silyl group or having a group capable of forming a silyl group are copolymerized. And a method of saponifying the obtained copolymer.
  • the OX group is introduced when saponifying the copolymer, wherein X represents a monovalent metal atom such as sodium or potassium.
  • olefinic unsaturated monomer examples include, for example, burtrimethoxysilane, vinyltris- (j8-methoxyethoxy) silane, aryltrimethoxysilane, vinyltriacetoxysilane, and aryltriacetoxysilane.
  • Silane vinyl methyl dimethoxy silane, vinyl dimethyl methoxy silane, vinyl methyl ethoxy silane, vinyl dimethyl ethoxy silane, bimethoxy silane, vinyl triisopropoxy silane, vinyl tributoxy silane, vinyl trihexyloxy silane, vinyl methoxy dihexyloxy Silane, vinyldimethoxyoctyloxysilane, vinylmethoxydioctyloxysilane, vinyltrioctyloxysilane, vinylmethoxydilauryloxysilane, buldimethoxylauryloxysilane, burmet Xysiole Xysilane, Buldimethoxyeole Xysilane, 3- (meth) acrylamido-provided trimethoxysilane, 3- (meth) acrylamido-propyltriethoxysilane, 3- (meth) acryl Amido-propyltri ( ⁇ -methoxye
  • Another method for introducing a silyl group into PVA is obtained by polymerizing a butyl ester monomer in the presence of an epoxy group-containing compound such as arylglycidyl ether or butadiene monooxide.
  • an epoxy group-containing compound such as arylglycidyl ether or butadiene monooxide.
  • a method of reacting a vinyl ester-based copolymer containing an epoxy group with a compound having a mercapto group and a silyl group in the molecule, for example, trimethoxysilylmethylmercaptan, and then saponifying the compound is used.
  • a vinyl ester-based polymer obtained by polymerizing a vinyl ester-based monomer using a compound having a mercapto group and a silyl group in the molecule, for example, trimethoxysilylmethylmercaptan as a chain transfer agent is used.
  • a method for producing a PVA having a silyl group at the terminal by saponification is also included in the method S, but is not limited to these methods.
  • the purpose of the present invention is not impaired! / Within the range, even when a copolymerizable monomer is copolymerized when polymerizing a bulester-based monomer.
  • a monomer include ⁇ -olefins such as ethylene, propylene, 1-butene and isobutene; unsaturated acids such as acrylic acid, methacrylic acid, crotonic acid, fumaric acid, maleic acid and itaconic acid; Salts or C18-C18 mono- or dialkylesters; acrylamide, C11-C18 ⁇ ⁇ ⁇ ⁇ alkylacrylamide, ⁇ , ⁇ -dimethylacrylamide, diacetone acrylamide, 2-acrylamidopropanesulfonic acid or a salt thereof, Atari Acrylamides such as luamidopropyldimethylamine or an acid salt or a quaternary salt thereof; methacrylamide, N-alkylmethacrylamide having 118 carbon
  • Halogenated butyls such as acrylyl acetate, acrylyl chloride, aryl alcohol, dimethylaryl alcohol, etc., but not limited thereto.
  • the amount of these monomers used is not particularly limited as long as the obtained silyl group-containing PVA (A) can be dissolved in an alkaline aqueous solution having a pH of 9 or more, but all the units used for copolymerization are usually used. It is preferably 10 mol% or less in a ratio based on.
  • the silyl group-containing PVA (A) that can be used in the present invention is a vinyl ester monomer in the presence of a thiol compound such as thiolacetic acid, mercaptopropionic acid, or an alkyl mercaptan having 18 or less carbon atoms. It can also be produced by polymerizing the polymer and saponifying the resulting vinyl ester polymer having a silyl group at the terminal.
  • a thiol compound such as thiolacetic acid, mercaptopropionic acid, or an alkyl mercaptan having 18 or less carbon atoms. It can also be produced by polymerizing the polymer and saponifying the resulting vinyl ester polymer having a silyl group at the terminal.
  • the silyl group-containing PVA (A) that can be used in the present invention is obtained by converting a PVA to a carboxylic acid group-containing conjugate such as formaldehyde, acetoaldehyde and butyraldehyde in the presence of an acid catalyst. It is produced by introducing a silyl group by post-modification into the acetal ⁇ PV PVA that has been subjected to acetal ⁇ ⁇ ⁇ ⁇ ⁇ , or by introducing a silyl group by post-modification into a PVA containing an acetoacetyl group obtained by the reaction of PVA and diketene. I'll tell you.
  • the scale adhesion inhibitor of the present invention is obtained by polymerizing a vinyl monomer such as Shiridani Bull alone or in an aqueous medium, or by copolymerizing with another copolymer component. Manufacture of polymer It can be used when doing.
  • the polymerization of vinyl chloride for the purpose of producing a vinyl chloride polymer is usually carried out by using a polymerization initiator such as a peroxide compound or an azoide compound under stirring in an aqueous medium.
  • a polymerization initiator such as a peroxide compound or an azoide compound under stirring in an aqueous medium.
  • the process is carried out in the temperature range of 40-80 ° C, but when ordinary PVA is used as an antifouling agent, the film formed on the inner wall of the polymerization reactor is gradually added to the aqueous medium during the polymerization of vinyl chloride. Will dissolve.
  • the scale adhesion inhibitor of the present invention has improved water resistance to the aqueous medium under the polymerization conditions, so that the coating formed on the inner wall of the polymerization reactor is long without being dissolved in the aqueous medium. It is maintained over time and has an excellent anti-scaling effect.
  • the silyl group-containing PVA (A) can be used alone or in combination of two or more.
  • the phenolic hydroxyl group-containing compound (B) used in the present invention is a compound in which a hydroxyl group is directly bonded to an aromatic ring.
  • the aromatic ring includes not only a benzene ring but also a condensed aromatic ring such as a naphthalene ring or an anthracene ring, or a heteroaromatic ring.
  • the phenolic hydroxyl group-containing compound (B) those which dissolve in an alkaline aqueous solution having a pH of 9 or more are preferably used.
  • the phenolic hydroxyl group-containing compound (B) preferably used is a compound having a hydroxyl group bonded to a naphthalene ring, particularly naphthol.
  • a compound having a hydroxyl group bonded to a naphthalene ring is often less soluble in pure water than a compound having a hydroxyl group bonded to a benzene ring, and thus is suitable as a scale inhibitor.
  • the phenolic hydroxyl group-containing compound (B) can be used alone or in combination of two or more.
  • the silyl group-containing PVA (A) and the phenolic hydroxyl group-containing compound (B) are dissolved in water to prepare an alkaline aqueous solution having a pH of 9 or more. Used as an inhibitor.
  • the pH of the aqueous solution is less than 9, the silyl group-containing PVA (A) Hardly dissolves
  • most phenolic hydroxyl group-containing compounds (B) such as naphthol hardly dissolve. Therefore, it is impossible to uniformly apply such an aqueous solution to the polymerization reactor, and it is impossible to prevent the generation of scale.
  • a basic substance (C) such as sodium hydroxide, potassium hydroxide, ammonia, hydroxyammonium.
  • a basic substance (C) such as sodium hydroxide, potassium hydroxide, ammonia, hydroxyammonium.
  • X in the general formula (1) is a sodium atom
  • potassium hydroxide is used, Most of X in the general formula (1) is a potassium atom.
  • the alkaline aqueous solution may contain an organic solvent (eg, methanol, dioxane, or the like) that is mixed with water at an arbitrary ratio. When an organic solvent is used, its amount is preferably less than 50% by volume based on the total amount of the alkaline aqueous solution.
  • the scale adhesion inhibitor of the present invention there is no particular limitation on the use ratio of the silyl group-containing PVA (A) and the phenolic hydroxyl group-containing compound (B)!
  • the range where AZB) is 1 Z99-99Z1 is more preferable, and more preferably 1Z9-9Z1. If the weight ratio (AZB) between the silyl group-containing PVA (A) and the phenolic hydroxyl group-containing compound (B) is less than 1 Z99, a good film may not be formed on the inner wall of the polymerization reactor.
  • the concentration of the silyl group-containing PVA (A) and the phenolic hydroxyl group-containing compound (B) in the alkaline aqueous solution is not particularly limited, but is in the range of 0.01 to 20% by weight as the total solid concentration including other components. Is preferred. When the solid content concentration is within this range, it becomes easy to spray the scale adhesion inhibitor using a steam stream and apply it to the inside of the polymerization vessel.
  • the solid content concentration is more preferably 0.1 to 10% by weight.
  • the scale anti-adhesion agent of the present invention may be used in combination with any additive as needed within a range that does not hinder the effect of preventing scale adhesion.
  • the additives include water-soluble polymer compounds such as polyvinyl alcohol, partially saponified polyvinyl alcohol, methylcellulose, and sodium polyacrylate, anionic surfactants such as sodium dodecyl sulfate, silica sol, and alumina sol.
  • Water-soluble alkali metal salts such as ium, sodium ascorbate, sodium citrate, sodium bisulfite, sodium dithionite, sodium pyrophosphate, sodium hydrogen phosphate, potassium acetate and the like can be mentioned.
  • the scale adhesion inhibitor of the present invention is applied to the inside of a polymerization reactor, and then dried or washed with water. Although water washing may be performed immediately after the application, it is preferable that the substrate be dried and then washed with water. By such an operation, a film is formed quickly and easily inside the polymerization reactor.
  • the coating amount of the scale adhesion inhibitor is not particularly limited, but is preferably 0.01 to 10 g per square meter in terms of solid content.
  • the scale adhesion inhibitor of the present invention is a chlorinated butyl-based compound obtained by copolymerizing a salted butyl alone or another copolymerizable monomer in an aqueous medium, among the butyl-based monomers. It can be preferably employed in the production of a polymer.
  • the (co) polymerization of vinyl chloride can be performed by a suspension polymerization method or an emulsion polymerization method.
  • Examples of the monomer copolymerizable with vinyl chloride include vinyl acetate, ethylene, vinylidene chloride, acrylonitrile, and aryl methacrylate.
  • Examples of the polymerization initiator used for the (co) polymerization of vinyl chloride include organic peroxides such as isopropylperoxydicarbonate, lauroyl peroxide, tertiary butyl peroxypivalate, and benzoyl peroxide. And known compounds such as inorganic peroxidation compounds such as potassium persulfate, and azo compounds such as azobisisobutylyl-tolyl. Further, it is preferable to use a redox-based polymerization initiator in which a peroxidized product and a reducing agent are combined.
  • a dispersion stabilizer In the (co) polymerization of vinyl chloride by the suspension polymerization method, a dispersion stabilizer can be used.
  • a dispersion stabilizer a partial Ken-Dani Polyvinyl alcohol, methyl cellulose or the like can be suitably used.
  • an emulsion stabilizer When (co) polymerization of vinyl chloride is carried out by an emulsion polymerization method, an emulsion stabilizer can be used.
  • the emulsion stabilizer that can be used include anionic surfactants such as sodium dodecyl sulfate and sodium dodecyl benzene sulfonate, and nonionic surfactants such as polyoxyethylene lauryl ether.
  • aqueous alkaline solution was prepared by dissolving silyl group-containing PVA (A) and Z or phenolic hydroxyl group-containing conjugate (B) in an aqueous solution containing a basic substance (C), and used as an anti-scale adhesion agent.
  • the scale adhesion inhibitor was applied to the inner wall of the polymerization reactor using a scalpel, dried, washed sufficiently with water, and polymerized vinyl chloride.
  • the solid concentration in the alkaline aqueous solution was adjusted so that the coating amount of the scale adhesion inhibitor was about 0.2 g per square meter in terms of solid content.
  • the molar ratio of sodium hydroxide to vinyl acetate units of the vinyl ester polymer was 0.02 in the methanol solution containing 40% of the vinyl ester polymer, and the solid content concentration of the vinyl ester polymer was Was adjusted to 20% by weight, and methanol and a methanol solution containing 10% by weight of sodium hydroxide were stirred in this order under stirring, and a saponification reaction was started at 40 ° C.
  • PVA (Al) except that the amount of vinyl acetate and methanol charged, the amount of monomer having a silyl group, the type and amount of polymerization initiator used, the polymerization reaction conditions, and the saponification reaction conditions were changed.
  • the content of the butyltrimethylsilane unit in the obtained silyl group-containing PVA (A2) was 2.0 mol%, the saponification degree was 98.5 mol%, and the polymerization degree was 150.
  • a 3 L flask equipped with a reflux condenser was charged with 1350 mL of methanol, and then 144 g (0.9 mol) of 2,3-dihydroxynaphthalene was dissolved. After dissolution, the solution was heated to 65 ° C and refluxed, and a solution of 243 g (0.9 mol) of ferric chloride hexahydrate dissolved in 450 mL of methanol was added dropwise over 30 minutes. After completion of the dropwise addition, the reaction was continued for 5 hours while maintaining the reflux state. Next, the reaction solution was transferred into 4.5 L of dilute hydrochloric acid and stirred for 12 hours to produce a dimer of 2,3-dihydroxynaphthalene.
  • the weight average molecular weight (Mw) of the obtained co-condensate was 1,490.
  • Sodium hydroxide was dissolved in 100 g of distilled water to prepare a 0.3% by weight aqueous sodium hydroxide solution.
  • This further silyl group-containing PVA (A) a silyl group obtained in Synthesis Example 1 as containing P VA (A1) (polymerization degree 2500, saponification degree 98.0 mole 0/0, the silyl group content 0.8 mole%)
  • An alkaline aqueous solution was prepared by dissolving 0.10 g and 0.40 g of 1 naphthol (B1) as the phenolic hydroxyl group-containing compound (B), and used as an anti-scale adhesion agent.
  • the pH of the alkaline aqueous solution was 13.
  • the polymerization of the Shiri-Dairu bead was performed to evaluate the scale adhesion prevention property.
  • the scale adhesion amount was 0 in the case of the suspension polymerization method. . In the case of the emulsion polymerization method, it was 0.06 gZm 2 .
  • a scale adhesion inhibitor was used in the same manner as in Example 1 except that the types and amounts of the silyl group-containing PVA (A), the phenolic hydroxyl group-containing compound (B), and the basic substance (C) were changed as shown in Table 1. It was prepared and evaluated for scale adhesion prevention in the same manner as in Example 1. The results are shown in Table 1.
  • Comparative Example 1 and Comparative Example 3 Except not using the silyl group-containing PVA (A), a scale adhesion inhibitor was prepared in the same manner as in Examples 3 and 7, and the evaluation of scale adhesion prevention was performed in the same manner as in Example 1. Was. Table 1 shows the results.
  • a scale adhesion inhibitor was prepared in the same manner as in Example 3 and Example 7 except that PVA was changed to PVA (A3) (“PVA-117” manufactured by Kuraray Co., Ltd., unmodified PVA). Evaluation of the anti-scale adhesion property was performed in the same manner. The results are shown in Table 1.
  • Table 1 shows the results when PVA having a silyl group was used alone.
  • Table 1 shows the results when no scale adhesion inhibitor was used.
  • Example 1 Compound (B) (g / m 2 ) Type S.Mlg) Type Weight (g) Type Weight) Weight (g) ab
  • Example 1 A1 0.10 B1 0.40 C1 0.3 100 13 0.05 0.06
  • Example 2 A1 0.40 B1 0.10 C1 0.3 100 13 0.07 0.05
  • Example 3 A2 0.25 B1 0.25 C1 0.3 100 13 0.06 0.07
  • Example 4 A1 0.25 B2 0.25 C1 0.2 100 12 0.21 0.20
  • Example 5 A1 0.20 B3 0.25 C1 0.2 100 12 0.23 0.44
  • Example 6 A2 0.40 B3 0.25 C1 0.2 100 12 0.31 0.41
  • Example 7 A1 0.10 B3 0.25 C1 0.3 100 13 0.25 0.35
  • Example 8 A1 0.25 B4 0.25 C2 0.25 100 13 0.70 0.63
  • Example 9 A2 0.10 B5 0.25 C3 1.0 100 10 1.2 1.2
  • Example 10 A1 0.30 B6 0.15 C1 0.3 100 (Note
  • A1 a silyl group-containing PVA (modification amount 0.8 mole 0/0)
  • A2 PVA containing silyl group (modified amount 2.0 mol 0 /
  • the scale adhesion inhibitor of the present invention contains a silyl group-containing PVA (A) having a specific structure
  • the phenolic hydroxyl group-containing compound ( B) alone (Comparative Example 1, Comparative Example 3) and a scale anti-sticking agent using phenolic hydroxyl group-containing compound (B) and unmodified PVA (Comparative Example 2, Comparative Example 4)
  • the water resistance of the coating formed on the inner wall of the polymerization reactor is greatly improved as compared with the case of (1), and that the film has excellent scale adhesion prevention properties.
  • the anti-scaling agent of the present invention (Examples 11 to 11) is characterized in that the silyl group-containing PVA (A) is used alone for scale adhesion. Compared with the inhibitor (Comparative Example 5), it is remarkably superior in terms of anti-scale adhesion.
  • the reason why such an excellent effect is provided by the scale adhesion inhibitor of the present invention is that the use of the PVA (A) containing a silyl group enables the formation of a hydrophilic and water-resistant coating film. It is considered that this is because different effects, that is, polymerization inhibiting effects by using the phenolic hydroxyl group-containing compound (B) act synergistically.

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Abstract

Inhibiteur d’entartrage comprenant une solution aqueuse alkaline avec un pH de 9 ou supérieur qui contient un polymère silylate d’alcool vinylique (A) dans lequel le contenu de groupes silyles représentés par la formule générale suivante (1) est de 0.1 à 10 mol%, et un composé (B) de groupe phénolique hydroxy. Lorsqu’elle est préalablement appliquée aux parties internes d’ un vaisseau de polymérisation lors de la production d’un polymère vinylique en (co)polymérisant un monomère vinylique unique ou avec d’autre(s) ingrédient(s) copolymérisable(s), l’inhibiteur d’entartrage donne un excellent résultat de prévention d’entartrage. (1) (Dans la formule, R1 représente l’hydrogène ou un C8 optionnellement substitué ou un groupe d’hydrocarbure inférieur ; R2 représente l’alkoxy ou l’acyloxy C1-40 avec un substitut oxygénique en option ; n est un nombre entier compris entre 0 et 2 et m est un nombre entier compris entre 0 et 3, et la somme de n et de m est égale à 3 ou inférieure ; X représente l’hydrogène ou un atome de métal monovalent.
PCT/JP2005/003938 2004-03-11 2005-03-08 Inhibiteur d’entartrage Ceased WO2005087815A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008248167A (ja) * 2007-03-30 2008-10-16 Kuraray Co Ltd スケール付着防止剤
US9434844B2 (en) 2011-10-12 2016-09-06 Ineos Europe Ag Additive, composition comprising it and use thereof
JP7307290B1 (ja) * 2023-01-27 2023-07-11 信越化学工業株式会社 組成物、組成物を生産するための方法、反応装置、重合体を生産するための方法

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