WO2015064337A1 - アセトアセチル基含有ポリビニルアルコール系樹脂粉末およびその製造方法 - Google Patents
アセトアセチル基含有ポリビニルアルコール系樹脂粉末およびその製造方法 Download PDFInfo
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- WO2015064337A1 WO2015064337A1 PCT/JP2014/077131 JP2014077131W WO2015064337A1 WO 2015064337 A1 WO2015064337 A1 WO 2015064337A1 JP 2014077131 W JP2014077131 W JP 2014077131W WO 2015064337 A1 WO2015064337 A1 WO 2015064337A1
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- pva
- polyvinyl alcohol
- resin powder
- alcohol resin
- pva powder
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L31/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid; Compositions of derivatives of such polymers
- C08L31/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C08L31/04—Homopolymers or copolymers of vinyl acetate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F16/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F16/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F16/04—Acyclic compounds
- C08F16/06—Polyvinyl alcohol ; Vinyl alcohol
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F216/04—Acyclic compounds
- C08F216/06—Polyvinyl alcohol ; Vinyl alcohol
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/06—Treatment of polymer solutions
- C08F6/10—Removal of volatile materials, e.g. solvents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/14—Esterification
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
Definitions
- the present invention relates to an acetoacetyl group-containing polyvinyl alcohol-based resin powder that has an extremely small amount of insoluble matter when made into an aqueous solution, and a method for producing the same.
- AA-PVA acetoacetyl group-containing polyvinyl alcohol resin
- PVA polyvinyl alcohol resin
- AA-PVA production method (Patent Document 1) in which PVA and diketene are reacted in the presence of a fatty acid ester (methyl acetate) and an acid anhydride (acetic anhydride), (2) AA-PVA production method in which PVA and diketene are reacted in the presence of an organic acid (acetic acid) and an acid anhydride (acetic anhydride) (Patent Document 2), (3) AA-PVA production method in which PVA and diketene are reacted in the presence of an organic acid (acetic acid) and water (Patent Document 3), (4) A method of producing AA-PVA using PVA powder as a raw material having an average particle size of 250 to 1000 ⁇ m and a content of PVA powder having a particle size of 150 ⁇ m or less of 20% by weight or less (Patent Document 4), (5) Further, a method for producing AA-PVA by drying AA-
- AA-PVA As the required properties for AA-PVA obtained by the above-described production, for example, there is a small amount of insoluble matter, that is, good water solubility, and particularly AA-PVA excellent in water solubility is required. However, a satisfactory product has not been obtained yet, and its development is desired.
- the present invention has been made in view of such circumstances, and an object thereof is to provide an AA-PVA powder having excellent water solubility and a method for producing the same.
- the present inventor has intensively studied to obtain an AA-PVA powder excellent in water solubility.
- an AA-PVA powder was prepared, washed with a lower alcohol, and then dried.
- the alcohol used for the washing has no influence on the physical properties of AA-PVA. Rather, when using AA-PVA, there is a risk of damaging the health of workers and causing odors.
- the residual alcohol content in AA-PVA powder should be as close to 0 as possible. Has been considered.
- those containing about 5% by weight of residual alcohol are usually used from the viewpoint of drying energy, cost, and the like.
- the present inventor has overturned such technical common sense and found that a good result can be obtained when a specific amount of a lower alcohol is contained to obtain the above characteristics. That is, the inventors have found that when the content of the lower alcohol is within the above specific range, an AA-PVA powder having excellent water solubility and low insoluble content can be obtained, and the present invention has been achieved. By containing a small amount of the lower alcohol, an AA-PVA powder having excellent water solubility and low insoluble content can be obtained. This is because a small amount of the lower alcohol is present in the AA-PVA powder. It is presumed that water easily enters the voids between the particles, and as a result, water solubility is improved.
- the first gist of the present invention is an AA-PVA powder containing 0.5 to 4% by weight of an alcohol having 1 to 3 carbon atoms.
- the present invention is a production method for producing the AA-PVA powder according to the first aspect, wherein the PVA powder is reacted with diketene to produce the AA-PVA powder, and the AA-PVA powder is carbonized.
- the AA-PVA A method for producing AA-PVA powder comprising a step of drying the powder at a temperature of 40 to 120 ° C. and a pressure of 20 kPa or less is a second gist.
- the AA-PVA powder of the present invention contains 0.5 to 4% by weight of alcohol having 1 to 3 carbon atoms. For this reason, it comes to have excellent water solubility.
- the specific AA-PVA powder is prepared by reacting PVA powder with diketene to produce AA-PVA powder, and then washing the AA-PVA powder with an alcohol having 1 to 3 carbon atoms to obtain unreacted diketene. Then, the AA-PVA powder is dried at a temperature of 40 to 120 ° C. and a pressure of 20 kPa or less.
- the specific AA-PVA powder can be obtained by such a production method.
- the specific AA-PVA powder of the present invention contains a specific amount of alcohol having 1 to 3 carbon atoms.
- the AA-PVA powder used as a raw material for the specific AA-PVA powder of the present invention is a product obtained by introducing an acetoacetyl group into a PVA powder obtained by saponifying a polyvinyl ester resin, which is a polymer of vinyl ester monomers.
- PVA in powder form having an acetoacetyl group in the side chain Specifically, it has a structural unit represented by the following formula (1), in addition to the structural unit having an acetoacetyl group represented by the formula (1), a vinyl alcohol structural unit, and further It has a vinyl acetate structural unit that is a saponified moiety.
- vinyl ester monomer used as the raw material examples include vinyl formate, vinyl acetate, vinyl propionate, vinyl valelate, vinyl butyrate, vinyl isobutyrate, vinyl pivalate, vinyl caprate, vinyl laurate, vinyl stearate, benzoic acid.
- vinyl and vinyl versatate examples include vinyl and vinyl versatate, and vinyl acetate is preferably used from the viewpoint of economy.
- a saponified product of a copolymer of the vinyl ester monomer and a monomer copolymerizable with the vinyl ester monomer can be used.
- copolymer monomers include ethylene, propylene, Olefins such as isobutylene, ⁇ -octene, ⁇ -dodecene, ⁇ -octadecene, 3-buten-1-ol, 4-penten-1-ol, 5-hexen-1-ol, 3,4-dihydroxy-1- Hydroxy group-containing ⁇ -olefins such as butene and derivatives thereof such as acylated products thereof, acrylic acids, methacrylic acid, crotonic acid, maleic acid, maleic anhydride, itaconic acid, undecylenic acid and other unsaturated acids, salts and monoesters thereof Or nitriles such as dialkyl esters, acrylonitrile, methacrylonitrile, di Amides such as seton acryl
- the introduction amount of the copolymerization monomer is appropriately set depending on the kind of the monomer, but it is usually 10 mol% or less, particularly 5 mol% or less. If the introduction amount is too large, water solubility and chemical resistance are obtained. Since it may be damaged, it is not preferable.
- the main chain bonding mode is mainly 1,3-diol bond, and the content of 1,2-diol bond is about 1.5 to 1.7 mol%. It is also possible to use those having a content of 1.7 to 3.5 mol% by increasing the polymerization temperature when polymerizing the ester monomer.
- the content of the structural unit having an acetoacetyl group in the AA-PVA powder is usually 0.1 to 20 mol%, more preferably 0.3 to 10 mol%, and particularly preferably 1 to 8 mol%. If the content of the structural unit having an acetoacetyl group is too small, the water resistance tends to decrease, and if the content is too large, the acetoacetyl groups react with each other due to long-term storage in a high temperature and high humidity environment. There is a tendency to form a cross-linked structure and to reduce water solubility.
- the saponification degree in the AA-PVA powder (the saponification degree of the PVA powder as the raw material of the AA-PVA powder) is usually 75 to 99.9 mol%, more preferably 80 to 99.5 mol%, particularly Preferably, it is 85 to 99.3 mol%. If the saponification degree of the AA-PVA powder is too low, the solubility in water tends to decrease, which is not preferable.
- the average degree of polymerization (according to JIS K6726) of the AA-PVA powder is usually 300 to 4000, particularly preferably 400 to 2000, and more preferably 500 to 1500.
- the average degree of polymerization is too low, the water resistance tends to decrease.
- the average degree of polymerization is too high, the viscosity increases and the handling tends to be difficult.
- the average particle size of the AA-PVA powder is usually 50 to 1000 ⁇ m, preferably 100 to 900 ⁇ m, particularly preferably 150 to 800 ⁇ m. If the average particle size is too small, it tends to become a powder during reaction with diketene and tends to cause uneven reaction, and if too large, the reaction with diketene tends to become uneven.
- the average particle diameter means that the AA-PVA particles are 1700 ⁇ m, 1000 ⁇ m, 850 ⁇ m, 500 ⁇ m, 250 ⁇ m, and 150 ⁇ m, and the particle size is 1700 ⁇ m or more, 1000 ⁇ m or more and less than 1700 ⁇ m using a sieve shaker.
- diketene is reacted with the raw material PVA powder (reaction generation step), and then unreacted diketene is washed and removed using an alcohol having 1 to 3 carbon atoms (washing step). ), And then dried under predetermined conditions (drying process).
- a method for introducing an acetoacetyl group by reacting a diketene with the PVA powder include, for example, a method in which a PVA powder and a gaseous or liquid diketene are directly reacted, and an organic acid such as acetic acid is adsorbed and occluded in advance in the PVA powder. Thereafter, a method of reacting a gaseous or liquid diketene in an inert gas atmosphere, a method of reacting a PVA powder by spraying a mixture of an organic acid and a diketene, and the like.
- reaction apparatus an apparatus that can be heated and equipped with a stirrer is preferable.
- a kneader, a Henschel mixer, a ribbon blender, and other various blenders can be used.
- the alcohol having 1 to 3 carbon atoms used in the washing step include ethanol, methanol, and n-butyl alcohol.
- methanol is preferably used because it has a low boiling point and requires less energy for removal.
- the temperature is usually 40 to 120 ° C., preferably 50 to 110 ° C., particularly preferably 60 to 100 ° C. If the temperature is too high, the resin deteriorates, and if it is too low, drying takes too much time.
- the pressure is usually 20 kPa or less, preferably 17.3 kPa or less, particularly preferably 13.3 kPa or less. If the pressure is too high, drying takes time, which is not preferable as a production process. In addition, the lower limit of the said pressure is so good that it is close to 0 kPa.
- the drying time is appropriately selected in consideration of the temperature and pressure conditions as well as the weight of the object to be treated, but it is usually preferable to set it within a range of 30 to 1200 minutes.
- the specific AA-PVA powder obtained as described above usually contains 0.8 to 4% by weight of alcohol having 1 to 3 carbon atoms, preferably 0.8 to 3.5% by weight, particularly The content is preferably 0.8 to 3.0% by weight. If the content of the alcohol is too large, problems such as blocking occur, and if it is too small, the insoluble matter increases.
- the fact that the AA-PVA powder contains a specific amount of alcohol having 1 to 3 carbon atoms does not mean that the alcohol having 1 to 3 carbon atoms is impregnated in each AA-PVA particle. It means that an alcohol having 1 to 3 carbon atoms exists between the AA-PVA particles and on the surface of the particles and exists substantially uniformly without being unevenly distributed in the entire AA-PVA powder.
- the alcohol content (content concentration) of 1 to 3 carbon atoms in the AA-PVA powder is measured by, for example, quantifying the residual alcohol in the AA-PVA powder by an internal standard method using gas chromatography. can do. Specifically, the measurement and calculation can be performed as follows, taking as an example the case where methanol is used as the alcohol having 1 to 3 carbon atoms as the cleaning liquid.
- a gas chromatograph 7890B (using FID as a detector) manufactured by Agilent is used, and ChemStationOpenLAB is used as analysis software.
- a column packed column (material / glass), a filler gas chromo pack 55ID (3 mm ⁇ 3 m) is used, and an analysis temperature is OVEN: 150 ° C., inlet: 150 ° C., detector : 160 ° C., and nitrogen is used as a carrier gas.
- n-propanol (100 ⁇ l), methanol (100 ⁇ l), and methyl acetate (86 ⁇ l) are weighed into a 50 ml volumetric flask and made up to 50 ml with pure water.
- AA-PVA test solution was prepared by first putting 138 ml of pure water and a rotor into a pressure-resistant dissolution bottle and adding 5.30 g of a measurement sample (AA-PVA powder) under stirring with a stirrer. Let After dispersion, the temperature is raised in a hot water bath and the AA-PVA powder is heated and dissolved at 95 ° C. or higher. After confirming complete dissolution, it is cooled to room temperature (20 ⁇ 10 ° C.). After cooling, add n-propanol (100 ⁇ l), seal tightly, and stir to make a uniform solution. (5) The amount of methanol (concentration) in the AA-PVA powder can be determined as follows.
- the calculation is performed according to the following formula from the result of the above reference solution to obtain the Peak Factor (PF) of methanol, and the methanol concentration (wt%) is calculated from the result of the AA-PVA test solution.
- Methanol-containing concentration Used weight of n-propanol (g) ⁇ (methanol area / n-propanol area) ⁇ (methanol PF / 5.30) ⁇ 100
- the specific AA-PVA powder of the present invention includes additives such as antifoaming agents, antifungal agents, preservatives, leveling agents, various emulsions, etc. within the range that does not impair the properties of the present invention depending on the application. These other components may be added as appropriate.
- the amount of the other components added is usually 10 parts by weight or less, and more preferably 5 parts by weight or less with respect to 100 parts by weight of AA-PVA powder.
- Examples of the use of the specific AA-PVA powder of the present invention include various uses as shown in the following (1) to (10).
- Molded items fibers, films, sheets, pipes, tubes, leak-proof membranes, temporary coatings, chemical laces, water-soluble fibers, etc.
- Adhesive-related Adhesives such as wood, paper, aluminum foil and plastic, adhesives, rehumidifiers, binders for nonwoven fabrics, binders for various building materials such as gypsum board and fiberboard, binders for various types of powder granulation , Cement and mortar additives, hot melt adhesives, pressure sensitive adhesives, anionic paint fixing agents, etc.
- Coating agents Paper clear coating agent, paper pigment coating agent, paper internal sizing agent, textile product sizing agent, warp glue, fiber processing agent, leather finishing agent, paint, anti-fogging agent, Metal corrosion inhibitor, galvanizing brightener, antistatic agent, conductive agent, provisional paint, etc.
- Hydrophobic resin blending agent hydrophobic resin antistatic agent, hydrophilicity-imparting agent, composite fiber, film and other additives for molded articles.
- Suspension dispersion stabilizers Suspension polymerization of various vinyl compounds such as pigment dispersion stabilizers such as paint, ink, water color, adhesive, vinyl chloride, vinylidene chloride, styrene, (meth) acrylate, vinyl acetate Dispersion stabilizer for use.
- Emulsion dispersion stabilizers various acrylic monomers, ethylenically unsaturated compounds, emulsifiers for emulsion polymerization of butadiene compounds, hydrophobic resins such as polyolefins and polyester resins, post-emulsifiers such as epoxy resins, paraffin and bitumen.
- Thickener-related Various aqueous solutions and emulsions, thickeners for oil drilling fluids, etc.
- Coagulant relation coagulant of suspension in water and dissolved substance, drainage of pulp, slurry, etc.
- Exchange resin, etc . ion exchange resin, chelate exchange resin, ion exchange membrane, etc.
- Others soil improver, photosensitizer, photosensitive resist resin, and the like.
- AA-PVA powder > 3600 parts of powdered unmodified PVA (average polymerization degree 1200, saponification degree 99.2 mol%, average particle diameter 200 ⁇ m) are charged into a ribbon blender with temperature control, and 1000 parts of acetic acid is added to this to swell and rotate. While stirring at several 20 rpm, the temperature was raised to 60 ° C., 550 parts of diketene was added dropwise over 3 hours, and the mixture was further reacted for 1 hour. After completion of the reaction, AA-PVA powder was prepared by washing with methanol.
- ⁇ Drying process of AA-PVA powder> Of the methanol-containing AA-PVA powder obtained above, 200 parts were dried at 90 ° C. under a pressure of 5.33 kPa for 60 minutes to obtain the intended AA-PVA powder. ⁇ Measurement of methanol content> The amount of methanol contained in the obtained AA-PVA powder was measured and calculated according to the measurement method described above. As a result, the methanol content was 3.71% by weight, the degree of acetoacetylation was 5.3 mol%, the degree of saponification and the average degree of polymerization were as in the raw PVA as a raw material.
- Example 2 AA-PVA powder was obtained in the same manner as in Example 1 except that the drying time was changed to 90 minutes. The obtained AA-PVA powder was used for measurement and evaluation in the same manner as in Example 1. The results are shown in Table 1 below.
- Example 3 In Example 1, AA-PVA powder was obtained in the same manner except that the drying time was changed to 180 minutes. The obtained AA-PVA powder was used for measurement and evaluation in the same manner as in Example 1. The results are shown in Table 1 below.
- AA-PVA powder was obtained in the same manner as in Example 1 except that the drying time was changed to 960 minutes. The obtained AA-PVA powder was used for measurement and evaluation in the same manner as in Example 1. The results are shown in Table 1 below.
- the AA-PVA powder of the present invention includes, for example, various molding materials, various adhesive materials, coating materials, blending agents for hydrophobic resins, suspension dispersion stabilizers, emulsion dispersion stabilizers, thickeners, flocculants, and exchanges. It is suitably used for various applications such as resins.
Abstract
Description
(1)脂肪酸エステル(酢酸メチル)および酸無水物(無水酢酸)の共存下でPVAとジケテンを反応させるAA-PVAの製造方法(特許文献1)、
(2)有機酸(酢酸)および酸無水物(無水酢酸)の共存下でPVAとジケテンを反応させるAA-PVAの製造方法(特許文献2)、
(3)有機酸(酢酸)と水の共存下でPVAとジケテンを反応させるAA-PVAの製造方法(特許文献3)、
(4)平均粒子径が250~1000μmで、かつPVA粉末における粒子径150μm以下の含有量が20重量%以下の原料となるPVA粉末を用いてAA-PVAを製造する方法(特許文献4)、
(5)さらには、上記のような方法にて製造したAA-PVAを100mmHgの減圧下で乾燥することによりAA-PVAを製造する方法が開示されている(特許文献5)、
等が提案されている。
すなわち、本発明は、炭素数1~3のアルコールを0.5~4重量%含有するAA-PVA粉末を第1の要旨とする。
以下、本発明について詳細に説明する。
本発明の特定のAA-PVA粉末の原料となるAA-PVA粉末は、ビニルエステル系モノマーの重合体であるポリビニルエステル系樹脂をケン化して得られるPVA粉末にアセトアセチル基を導入したものであり、側鎖にアセトアセチル基を有する粉末状のPVAである。具体的には、下記の式(1)で表される構造単位を有するものであり、この式(1)で表されるアセトアセチル基を有する構造単位以外に、ビニルアルコール構造単位、さらには未ケン化部分である酢酸ビニル構造単位を有している。
本発明において、(メタ)アクリルとは、アクリルまたはメタクリルをいい、(メタ)アクリレートとはアクリレートまたはメタクリレートをいう。
本発明の特定のAA-PVA粉末は、原料となるPVA粉末にジケテンを反応させ(反応生成工程)、その後、炭素数1~3のアルコールを用いて未反応のジケテンを洗浄除去し(洗浄工程)、ついで所定の条件にて乾燥させる(乾燥工程)ことにより製造することができる。上記PVA粉末にジケテンを反応させることによりアセトアセチル基を導入する方法としては、例えば、PVA粉末とガス状または液状のジケテンを直接反応させる方法、酢酸等の有機酸をPVA粉末に予め吸着吸蔵させた後、これに不活性ガス雰囲気下でガス状または液状のジケテンを反応させる方法、あるいはPVA粉末に有機酸とジケテンの混合物を噴霧して反応させる方法、等があげられる。
(1)ガスクロマト装置として、Agilent社製の7890B(検出器としてFID使用)を使用するとともに、解析ソフトとして、ChemStationOpenLABを使用する。
(2)また、分析条件として、カラム:パックドカラム(材質/ガラス)、充填剤ガスクロパック55ID(3mm×3m)を使用し、分析温度は、OVEN:150℃、注入口:150℃、検出器:160℃とし、キャリアーガスとしては窒素を使用する。
(3)基準液として、n-プロパノール(100μl)、メタノール(100μl)、酢酸メチル(86μl)を50mlメスフラスコに量り採り、純水で50mlとしたものを使用する。
(4)AA-PVA試験溶液の調製方法は、まず、純水138mlおよび回転子を耐圧溶解瓶に投入し、測定サンプル(AA-PVA粉末)5.30gをスターラーの撹拌下において、投入し分散させる。分散後、湯浴槽で昇温して95℃以上でAA-PVA粉末を加熱溶解させる。完溶したのを確認した後、室温(20±10℃)まで冷却する。冷却後、n-プロパノール(100μl)を添加し、密栓した後、撹拌して均一な溶液とする。
(5)AA-PVA粉末中のメタノール量(含有濃度)は、以下のように求めることができる。
メタノールのPF=(メタノールの使用重量/n-プロパノールの使用重量)/(メタノールの面積/n-プロパノールの面積)=重量比(wt)/面積比(AR)
メタノール含有濃度(重量%)=n-プロパノールの使用重量(g)×(メタノールの面積/n-プロパノールの面積)×(メタノールのPF/5.30)×100
(2)接着剤関係:木材、紙、アルミ箔、プラスチック等の接着剤、粘着剤、再湿剤、不織布用バインダー、石膏ボードや繊維板等の各種建材用バインダー、各種粉体造粒用バインダー、セメントやモルタル用添加剤、ホットメルト型接着剤、感圧接着剤、アニオン性塗料の固着剤等。
(3)被覆剤関係:紙のクリアーコーティング剤、紙の顔料コーティング剤、紙の内添サイズ剤、繊維製品用サイズ剤、経糸糊剤、繊維加工剤、皮革仕上げ剤、塗料、防曇剤、金属腐食防止剤、亜鉛メッキ用光沢剤、帯電防止剤、導電剤、暫定塗料等。
(4)疎水性樹脂用ブレンド剤関係:疎水性樹脂の帯電防止剤、および親水性付与剤、複合繊維、フィルムその他成形物用添加剤等。
(5)懸濁分散安定剤関係:塗料、墨汁、水性カラー、接着剤等の顔料分散安定剤、塩化ビニル、塩化ビニリデン、スチレン、(メタ)アクリレート、酢酸ビニル等の各種ビニル化合物の懸濁重合用分散安定剤等。
(6)乳化分散安定剤関係:各種アクリルモノマー、エチレン性不飽和化合物、ブタジエン性化合物の乳化重合用乳化剤、ポリオレフィン、ポリエステル樹脂等疎水性樹脂、エポキシ樹脂、パラフィン、ビチューメン等の後乳化剤等。
(7)増粘剤関係:各種水溶液やエマルジョンや石油掘削流体の増粘剤等。
(8)凝集剤関係:水中懸濁物及び溶存物の凝集剤、パルプ、スラリーの濾水性等。
(9)交換樹脂等関係:イオン交換樹脂、キレート交換樹脂、イオン交換膜等。
(10)その他:土壌改良剤、感光剤、感光性レジスト樹脂等。
<AA-PVA粉末の作製>
温度調節付きリボンブレンダーに、粉末状の未変性PVA(平均重合度1200、ケン化度99.2モル%、平均粒子径200μm)を3600部仕込み、これに酢酸1000部を加えて膨潤させ、回転数20rpmで撹拌しながら、60℃に昇温した後、ジケテン550部を3時間かけて滴下し、更に1時間反応させた。反応終了後、メタノールで洗浄することによりAA-PVA粉末を作製した。
上記にて得られたメタノール含有のAA-PVA粉末のうち200部を、圧力5.33kPa下、90℃で60分間乾燥することにより目的とするAA-PVA粉末を得た。
<含有メタノール量の測定>
得られたAA-PVA粉末の含有メタノール量を上述の測定法に従って測定・算出した。その結果、メタノール含有量は3.71重量%であり、アセトアセチル化度は5.3モル%、ケン化度および平均重合度は原料である未変性PVAの通りであった。
三角フラスコ中のイオン交換水200mlに上記乾燥後のAA-PVA粉末約20g(Sg)を充分に分散させた後、95℃で1時間撹拌することによりAA-PVA粉末を溶解させた。そして、予め秤量してある44μmの金網(Ag)で濾過した。さらに、80~90℃の温水2リットルにて三角フラスコ内の不溶解分を完全に金網上に移して洗浄した後、電気定温乾燥器を用いて105℃で2時間乾燥を行ない、その重量(Bg)を測定した。これらの測定値から、下記の式(1)に基づき、不溶解分(%)を算出した。その結果を後記の表1に示す。
[(B-A)/S]×100 ・・・(1)
実施例1において、乾燥時間を90分に変更した以外は同様にしてAA-PVA粉末を得た。そして、得られたAA-PVA粉末を用い、実施例1と同様にして測定・評価した。その結果を下記の表1に示す。
実施例1において、乾燥時間を180分に変更した以外は同様にしてAA-PVA粉末を得た。そして、得られたAA-PVA粉末を用い、実施例1と同様にして測定・評価した。その結果を下記の表1に示す。
実施例1において、乾燥時間を960分に変更した以外は同様にしてAA-PVA粉末を得た。そして、得られたAA-PVA粉末を用い、実施例1と同様にして測定・評価した。その結果を下記の表1に示す。
Claims (3)
- 炭素数1~3のアルコールを0.5~4重量%含有することを特徴とするアセトアセチル基含有ポリビニルアルコール系樹脂粉末。
- 炭素数1~3のアルコールがメタノールである請求項1記載のアセトアセチル基含有ポリビニルアルコール系樹脂粉末。
- 請求項1または2記載のアセトアセチル基含有ポリビニルアルコール系樹脂粉末を製造する製造方法であって、ポリビニルアルコール系樹脂粉末にジケテンを反応させてアセトアセチル基含有ポリビニルアルコール系樹脂粉末を作製する工程と、上記アセトアセチル基含有ポリビニルアルコール系樹脂粉末を炭素数1~3のアルコールにて洗浄し未反応のジケテンを除去する工程と、上記洗浄後のアセトアセチル基含有ポリビニルアルコール系樹脂粉末の上記アルコール含有量を0.5~4重量%に制御するため、上記アセトアセチル基含有ポリビニルアルコール系樹脂粉末を温度40~120℃、圧力20kPa以下にて乾燥させる工程とを備えたことを特徴とするアセトアセチル基含有ポリビニルアルコール系樹脂粉末の製造方法。
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CN201480047177.5A CN105492471B (zh) | 2013-10-30 | 2014-10-10 | 含有乙酰乙酰基的聚乙烯醇系树脂粉末组合物及其制造方法 |
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CN107428969A (zh) * | 2015-02-20 | 2017-12-01 | 株式会社可乐丽 | 离子交换膜 |
CN108219035A (zh) * | 2016-12-21 | 2018-06-29 | 中国石化集团四川维尼纶厂 | 乙酰乙酰基改性聚乙烯醇及其制备方法和用途 |
CN111527181A (zh) | 2017-12-28 | 2020-08-11 | 三菱化学株式会社 | 地下处理用填塞材料、地下处理方法及坑井壁的填塞方法 |
JP7408625B2 (ja) * | 2019-03-14 | 2024-01-05 | 株式会社クラレ | 変性ビニルアルコール系重合体粒子の製造方法及びそれにより得られる粒子 |
CN111072800B (zh) * | 2019-12-06 | 2023-05-26 | 天津辛德玛悬浮剂有限公司 | 改性超高分子量的聚乙烯醇及其制备方法和应用 |
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CN105492471A (zh) | 2016-04-13 |
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