WO2015037605A1 - 多孔質構造を有する生分解性樹脂組成物、及び、その表面処理方法 - Google Patents
多孔質構造を有する生分解性樹脂組成物、及び、その表面処理方法 Download PDFInfo
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- 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
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/14—Chemical modification with acids, their salts or anhydrides
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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
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0033—Additives activating the degradation of the macromolecular compound
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- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/16—Biodegradable polymers
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Definitions
- the present invention relates to a biodegradable resin molded article using a biodegradable resin having a porous structure in the biodegradable resin composition on the surface, and a method for treating the surface.
- Such wastewater treatment is generally performed by biochemical treatment which is advantageous in terms of cost.
- the sewage introduced into the treatment tank is aerated in the presence of activated sludge, and the organic matter (BOD (Biochemical Oxygen Demand) source) contained in the sewage is oxidized and decomposed by the action of aerobic microorganisms in the activated sludge. Is done.
- This treatment with activated sludge has a weak function of removing nitrogen components, and nitrogen components such as ammonia tend to remain.
- nitrate nitrogen component
- nitrification treatment with ammonia as nitrate is performed by nitrifying bacteria, and then nitrogen components (nitrates) are removed by denitrification treatment with denitrifying bacteria under anoxic conditions. It is.
- This denitrification treatment uses the reducing action of denitrifying bacteria using organic matter (ie, BOD source) as an energy source and nitrate as an electron acceptor, and the organic matter that is the energy source is necessary for the reduction reaction of the denitrification reaction.
- organic matter ie, BOD source
- nitrate is reduced to nitrogen through nitrous acid, nitric oxide, and dinitrogen monoxide, and as a result, various nitrogen compounds in the wastewater are diffused into the atmosphere as nitrogen gas and removed.
- This denitrification treatment uses microorganisms as described above, and uses a solid organic substance as an energy source required for the denitrification reaction while supplementing the reducing power necessary for denitrification (solid-phase denitrification method). Etc. are adopted.
- the treatment efficiency can be improved by using microorganisms adhered to the surface of the resin carrier.
- surface treatment such as porosity
- surface treatment (such as porosity) is generally used. ) Must be applied.
- a production method by a so-called precipitation method has been proposed as shown in JP-A-2009-144012 and JP-A-2009-242728.
- a carrier that is easy to adhere to microorganisms and that is more suitable as a carbon source in the solid-phase denitrification method.
- An object of the present invention is to provide a biodegradable resin molded article that is easily fixed with microorganisms and that is particularly suitable for use in the solid-phase denitrification method, and a method for treating the surface thereof.
- the inventors of the present application have found that the above-described problems can be solved by treating a biodegradable resin molded article obtained by dispersing an ester decomposition accelerator in a biodegradable resin in a specific decomposition solution.
- the present invention has been completed.
- the present invention provides a biodegradable bioresin molded article having a porous structure in the biodegradable resin composition on the surface portion and having an ester degradation accelerator dispersed in the internal biodegradable resin composition.
- the present invention also relates to a method for treating the surface of a biodegradable resin molded article in which an ester degradation accelerator is dispersed in a biodegradable resin, the phosphoric acid having a pH in the range of 9 to 12 containing hydrolase.
- a surface treatment of a biodegradable resin molded article which comprises treating the biodegradable resin in a containing solution.
- a biodegradable resin molded product having a porous structure on the resin surface with low energy thereby allowing useful microorganisms to adhere easily, and having a high ability to supply a carbon source such as lactic acid used in a denitrification reaction.
- a carbon source such as lactic acid used in a denitrification reaction.
- the rate of resin degradation after treating a biodegradable resin molded article in a decomposition solution for 4 days is shown.
- the electron micrograph of the surface of a biodegradable resin molding and an inside is represented.
- the confocal laser scanning micrograph of the surface of a biodegradable resin molding is represented.
- the biodegradable resin molded article of the present invention has a porous structure in the biodegradable resin composition on the surface, and an ester decomposition accelerator is dispersed in the internal biodegradable resin composition.
- the arithmetic average roughness Sa of the surface of the porous structure is 1.0 ⁇ m or more, particularly 1.0 to 5.0 ⁇ m, and more preferably 1.0 to 2.0 ⁇ m. If it is larger than this range, the weight reduction rate with respect to the biodegradable resin molded product before the enzyme treatment is increased, so that the productivity is lowered. On the other hand, if it is smaller than this range, carriers such as microorganisms are hardly fixed.
- the arithmetic mean roughness Sa of the surface of the porous structure means the degree of porosity of the surface of the molded body.
- the porous structure surface is measured using a confocal laser scanning microscope (LSM-5 PASCAL-MAT: Carl Zeiss). It can be obtained from the 3D data obtained by observing the surface using the attached software.
- the biodegradable resin used in the present invention produces a carbon source such as lactic acid or a derivative of lactic acid mainly by non-biological hydrolysis, and the lactic acid or the like is a substrate that is an energy source of denitrifying bacteria. Become.
- an ester decomposition accelerator is dispersed in the biodegradable resin composition.
- Any biodegradable resin may be used as long as it exhibits biodegradability, for example, polylactic acid resin, polybutylene succinate, polycaprolactone, polyhydroxyalkanoate, polybutylene succinate-adipate copolymer, polybutylene terephthalate.
- polylactic acid resins are particularly preferred. These may be used alone or in combination of two or more.
- the above components may form a copolymer with other components.
- the component forming the biodegradable resin copolymer include polyhydric alcohols such as ethylene glycol, propylene glycol, butanediol, octanediol, dodecanediol, neopentyl glycol, glycerin, pentaerythritol, sorbitan, bisphenol A, and polyethylene glycol.
- Dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, glutaric acid, decanedicarboxylic acid, cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, anthracene dicarboxylic acid; glycolic acid, lactic acid, hydroxypropionic acid, hydroxybutyric acid, hydroxy Hydroxycarboxylic acids such as herbic acid, hydroxycaproic acid, hydroxybenzoic acid; glycolide, caprolactone, butyrolactone, valerolactone, poropiola Tons, such as lactones, such as undecalactone and the like.
- the molecular weight of the biodegradable resin is not particularly limited, but in view of mechanical properties and processability, the weight average molecular weight is preferably in the range of 5,000 to 1,000,000, and 10,000 to A range of 500,000 is more preferred.
- the ester decomposition accelerator used in the present invention is not particularly limited as long as it can accelerate the decomposition of the biodegradable resin.
- the ester decomposition accelerator is an acid releasing resin.
- the acid releasing resin is a polyester having a high polarity, that is, a high affinity to water, and preferably has a higher hydrolysis rate than the biodegradable resin. Since such an acid-releasing resin has a high hydrolysis rate, it is hydrolyzed in the biodegradable resin to release a water-soluble acid, and the acid is bleed from the biodegradable resin. Disassemble. As a result, the decomposition rate of the electron donor supply agent is also increased.
- Polarity can use SP value (solubility parameter) calculated from Fedors method (Polym.Eng.Sci., 14,147-154 (1974)) as an index, and the SP value is, for example, 22.0 or more. It may be 23.0 or more and 24.0 or more, and is preferably 25.0 or more.
- the acid to be released is preferably an aqueous solution having a concentration of 0.005 g / ml and a pH (25 ° C.) of 4 or less, particularly 3 or less.
- the acid released by the acid releasing resin is selected from the group consisting of lactic acid, oxalic acid, maleic acid, or glycolic acid and combinations thereof.
- Polyoxalate and polyglycolic acid-based resins are exemplified as those having the above characteristics, and these may be used alone or blended.
- a polymer obtained by polymerizing oxalic acid as at least one monomer in the homopolymer, copolymer or blend is preferably polyoxalate.
- the above components may form a copolymer with other components.
- the component forming the copolymer of the acid releasing resin include polyhydric alcohols such as ethylene glycol, propylene glycol, butanediol, octanediol, dodecanediol, neopentyl glycol, glycerin, pentaerythritol, sorbitan, bisphenol A, and polyethylene glycol.
- Dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, glutaric acid, decanedicarboxylic acid, cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, anthracene dicarboxylic acid; glycolic acid, lactic acid, hydroxypropionic acid, hydroxybutyric acid, hydroxy Hydroxycarboxylic acids such as herbic acid, hydroxycaproic acid, hydroxybenzoic acid; glycolide, caprolactone, butyrolactone, valerolactone, poropiola Tons, such as lactones, such as undecalactone and the like.
- the component released from the acid releasing resin is preferably used for biological treatment by microorganisms after bleeding from the biodegradable resin.
- the biodegradable resin molding is completely decomposed in the decomposition solution, and the entire decomposition product is used for biological treatment, thereby providing an environmental purification method that does not generate a residue.
- the component released from the acid releasing resin can be expected to have an effect of increasing the activity of microorganisms that purify the substance to be treated.
- the bleeding here refers to a phenomenon in which the hydrolyzate of the acid-releasing resin oozes from the inside of the biodegradable resin to the surface of the biodegradable resin.
- the content of the ester decomposition accelerator in the biodegradable resin molded product of the present invention is preferably 1 to 30% by weight, more preferably 5 to 20% by weight in view of processability.
- a biodegradable resin molded body containing a biodegradable resin and an ester decomposition accelerator before the treatment having a porous structure on the surface can be produced by a conventional method.
- an electron donor supply agent can be produced by supplying a biodegradable resin and an ester decomposition accelerator to a uniaxial or biaxial extrusion kneader at the same time, melt mixing them, and then pelletizing them.
- the melt extrusion temperature can be appropriately set by those skilled in the art in consideration of the glass transition temperature, melting point, mixing ratio, etc. of the biodegradable resin and ester decomposition accelerator to be used, but is generally 100 to 250 ° C. .
- biodegradable resin molded product of the present invention a known plasticizer, heat stabilizer, light stabilizer, antioxidant, ultraviolet absorber, flame retardant, colorant, pigment, filler, filler, if necessary Additives such as mold release agents, antistatic agents, fragrances, lubricants, foaming agents, antibacterial / antifungal agents, and nucleating agents may be blended. Moreover, you may mix
- water-soluble resins such as polyethylene glycol and polyvinyl alcohol
- water-soluble resins such as polyethylene glycol and polyvinyl alcohol
- a copolymer of a biodegradable resin and an acid releasing resin may be blended.
- the form of the biodegradable resin molded product of the present invention is not particularly limited, and may be in the form of pellets, films, powders, fibers, or filters.
- the biodegradable resin molded product of the present invention has a porous structure on the surface.
- the porous structure of the above-described surface portion of the biodegradable resin molded body is obtained by converting a biodegradable resin molded body in which an ester decomposition accelerator is dispersed in a biodegradable resin into phosphoric acid containing a hydrolase. It is obtained by processing in the method of the present invention including processing in a containing solution.
- a phosphoric acid-containing solution containing a hydrolase is used as a decomposition solution, and the above-described biodegradable resin molded body is treated in the same solution.
- the phosphoric acid-containing solution include aqueous solutions of sodium dihydrogen phosphate (NaH 2 PO 4 ), disodium hydrogen phosphate (Na 2 HPO 4 ), and buffers using these solutions, such as sodium dihydrogen phosphate.
- examples thereof include a phosphate buffer solution and a citrate-phosphate buffer solution obtained by mixing aqueous solutions of (NaH 2 PO 4 ) and disodium hydrogen phosphate (Na 2 HPO 4 ).
- the salt concentration can be, for example, 10 to 150 mM, preferably 50 to 120 mM.
- the pH of the phosphoric acid-containing solution can be appropriately selected depending on the type of biodegradable resin, ester degradation accelerator, hydrolase used, etc., and is preferably alkaline pH, for example, pH 9-12, preferably pH 10 11 can be adopted.
- the hydrolase used in the present invention is not particularly limited as long as it generally decomposes a biodegradable resin, and those skilled in the art can use any hydrolase.
- examples of such enzymes include protease, cellulase, cutinase, lipase and the like.
- proteases particularly alkaline proteases showing activity in an alkaline pH range are preferable, and for example, Savinase 16.0 L can be used.
- the amount of the hydrolyzable enzyme can be appropriately determined by those skilled in the art. For example, the amount of the hydrolyzable enzyme can be determined corresponding to the resin to be decomposed on the basis of the activity unit for each enzyme used.
- the biodegradable resin molding is treated by placing it in the decomposition solution. If necessary, operations such as shaking and stirring may be performed. Conditions such as treatment temperature and time can be appropriately set by those skilled in the art depending on the type and amount of biodegradable resin, ester degradation accelerator, and hydrolase used. -60 ° C, preferably 40-50 ° C, and the time can be 1 to 10 days, preferably 3 to 5 days.
- the portion of the ester decomposition accelerator is decomposed to make the surface portion porous. It is possible to have a quality structure.
- the decomposition of the biodegradable resin molded body is stopped at the surface portion, and the entire decomposition amount (weight reduction) of the main body of the biodegradable resin molded body is suppressed, so that it is possible to leave a large amount of base material. Therefore, the state in which the ester decomposition accelerator is present in the biodegradable resin can be maintained while the inside of the biodegradable resin molded body remains untreated.
- the biodegradable resin molded product produced by the method of the present invention is used in the solid-phase denitrification method, microorganisms adhere to the porous structure formed on the surface of the biodegradable resin molded product.
- Carbon that serves as an energy source for denitrifying bacteria in the denitrifying reaction because the ester decomposition accelerator remaining inside the biodegradable resin molded body promotes the decomposition from the inside of the biodegradable resin.
- the supply of the source is performed efficiently, and the efficiency of the denitrification process can be improved.
- the method of the present invention makes it possible to selectively treat the surface portion while minimizing the degradation of the base material itself of the biodegradable resin molded article.
- the weight loss of the entire resin molding is reduced.
- the weight reduction rate with respect to the biodegradable resin molded body before being treated by the method of the present invention is 40% or less, 10% or less, preferably 5% or less.
- ⁇ Degradable resin composition > 1. Polylactic acid; Nature Works 4032D was used. 2. Polyethylene oxalate (hereinafter abbreviated as “PEOx”) What was synthesize
- PEOx Polyethylene oxalate
- the taken-out polymer was granulated with a crusher, and crystallized by vacuum drying at 110 ° C. for 4 hours.
- the obtained polymer had a weight average molecular weight of 70,000, a melting point of 180 ° C., and a glass transition temperature of 35 ° C.
- the degree of porosity was evaluated using a phosphoric acid aqueous solution (disodium hydrogen phosphate 100 mM, pH 10.5) or a CHES aqueous solution (CHES 100 mM, pH 10.5).
- Example 1 A hydrolysis test was performed using PLA containing 5% PEOx as a biodegradable resin molded article, an aqueous phosphoric acid solution as a decomposition solution, and Savinase 16.0L (manufactured by Novozymes) as an enzyme.
- Comparative Example 1 The same procedure as in Example 1 was performed except that a CHES aqueous solution was used as the decomposition solution.
- Reference Example 1 The same procedure as in Example 1 was performed except that PLA was used as the biodegradable resin molded product.
- Reference Example 2 The same procedure as in Reference Example 1 was performed except that a CHES aqueous solution was used as the decomposition solution.
- FIG. 1 shows the resin degradation rates after 4 days for Example 1, Comparative Example 1, and Reference Examples 1 and 2.
- the weight reduction rate of each test example is as follows.
- FIG. 2 shows electron micrographs of the surface and the inside (only Example 1 and Comparative Example 1) of Example 1, Comparative Example 1, and Reference Examples 1 and 2.
- the confocal laser scanning micrograph which measured arithmetic mean roughness Sa about said Example 1, the comparative example 1, and the reference example 2 is shown in FIG.
- Example 1 in which the predetermined biodegradable resin molded body of the present application was treated with a phosphoric acid aqueous solution was compared with Comparative Example 1 in which the CHES aqueous solution was treated, It can be understood that a porous structure is formed on the surface of the degradable resin molded body while largely suppressing the overall decomposition (weight reduction). Further, referring to an electron micrograph of the inside of the biodegradable resin molded body, in Comparative Example 1, the internal porous structure is advanced due to the decomposition of the ester decomposition accelerator (PEOx) present inside. Can understand.
- PEOx ester decomposition accelerator
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Abstract
Description
また、本発明は、生分解性樹脂中にエステル分解促進剤が分散してなる生分解性樹脂成形体の表面を処理する方法であって、加水分解酵素を含むpH9~12の範囲のリン酸含有溶液中で生分解性樹脂を処理することを含む、生分解性樹脂成形体の表面処理を提供する。
生分解性樹脂の分子量としては、特に制限されるものではないが、機械的特性や加工性を考えると、重量平均分子量で5,000~1,000,000の範囲が好ましく、10,000~500,000の範囲がより好ましい。
上記特徴を有するものとして、ポリオキサレート、ポリグリコール酸系樹脂が挙げられ、これらは単独で用いてもよく、ブレンドしてもよい。本発明においては、ホモポリマー、共重合体、ブレンド体において、少なくとも一つのモノマーとしてシュウ酸を重合したポリマーをポリオキサレートとすることが好ましい。
リン酸含有溶液のpHは、使用する生分解性樹脂、エステル分解促進剤、加水分解酵素の種類等によって適宜選択することが可能であり、好ましくはアルカリ性のpH、例えばpH9~12、好ましくはpH10~11を採用することができる。
装置:セイコーインスツルメント株式会社製DSC6220(示差走査熱量測定)
試料調整:試料量5~10mg
測定条件:窒素雰囲気下、10℃/minの昇温速度で0℃~250℃の範囲で測定。
装置:ゲル浸透クロマトグラフGPC
検出器:示差屈折率検出器RI(Waters製RI-2414型、感度512)
カラム:昭和電工製Shodex HFIP-LG(1本)、HFIP-806M(2本)
溶媒:ヘキサフルオロイソプロパノール(5mM トリフルオロ酢酸ナトリウム添加)
流速:0.5mL/min
カラム温度:40℃
試料調製:試料約1.5mgに溶媒5mLを加え、室温で緩やかに攪拌した(試料濃度約0.03%)。目視で溶解していることを確認した後、0.45μmフィルターにて濾過した(秤量から繰り返し2回行った)。全ての試料について、調製開始から約1時間以内に測定を行った。
1.ポリ乳酸;
Nature Works社製 4032Dを用いた。
2.ポリエチレンオキサレート(以下「PEOx」と略す)
以下の方法で合成したものを用いた。
マントルヒーター、攪拌装置、窒素導入管、冷却管を取り付けた1Lのセパラブルフラスコに、
シュウ酸ジメチル 472g(4mol)
エチレングリコール 297g(4.8mol)
テトラブチルチタネート 0.42g
を入れ、窒素気流下フラスコ内温度を120℃からメタノールを留去しながら180℃まで加熱し7時間反応させた。最終的に270mlのメタノールを留去した。
その後、内温170℃~190℃に段階的に昇温し、0.1kPa~0.2kPaの減圧度で7時間反応後、粘度が上がり取り出した。
取り出したポリマーをクラッシャーで造粒し、110℃で4時間真空乾燥処理し結晶化させた。
得られたポリマーは重量平均分子量70000、融点180℃、ガラス転移温度35℃であった。
上述したポリ乳酸(PLA)、又は、PLAとPEOxのドライブレンドを、二軸押出機(テクノベル社製ULT Nano05-20AG)を用いて200℃で溶融混合し、ペレット状の生分解性樹脂成形体を試料とした。PLAとPEOxのブレンド比は重量比で95:5となるように成形した。得られた成形体は120℃5時間で乾燥し、吸水を防止するためアルミ袋に封入し、4℃にて保存した。
50mlのバイアル瓶に、上記で作製された生分解性樹脂成形体200mgを、所定量の酵素と共に、分解溶液30mlに加え、45℃、100rpmで振とうした。4日後にペレットを取りだし、60℃の真空乾燥機で4時間乾燥させ、重量を測定し、重量保持率を測定した。重量保持率は下記式で算出した。
重量保持率=100-{(初期重量-分解後重量)×100/初期重量}
その後、SEMにて形態観察を行った。
尚、分解溶液としては、リン酸水溶液(リン酸水素二ナトリウム 100mM, pH10.5)、又は、CHES水溶液(CHES 100mM, pH10.5)を用いて、多孔化度の評価を行った。
上述試験により得られたペレットを走査型電子顕微鏡(S-3400N:HITACHI社)を用いて表面形状を観察した。また、共焦点レーザースキャン顕微鏡(LSM 5 PASCAL MAT:Carl Zeiss社)を用いて1000倍にて267x210μm2の範囲で観察を行い、得られた3次元データから付属ソフトウェアを用いて多孔質構造表面の算術平均粗さ(Sa)を求めた。
生分解性樹脂成形体として5%PEOx含有PLA、分解液としてリン酸水溶液、酵素としてSavinase 16.0L(Novozymes社製)を用いて加水分解試験を行った。
(比較例1)
分解液としてCHES水溶液を用いた他は実施例1と同様に行った。
(参考例1)
生分解性樹脂成形体としてPLAを用いた他は実施例1と同様に行った。
(参考例2)
分解液としてCHES水溶液を用いた他は参考例1と同様に行った。
また、上記の実施例1、比較例1、参考例1、2について、表面及び内部(実施例1、比較例1のみ)の電子顕微鏡写真を図2に示す。
また、上記の実施例1、比較例1、参考例2について、算術平均粗さSaを測定した共焦点レーザースキャン顕微鏡写真を図3に示す。
Claims (10)
- 表面部の生分解性樹脂組成物に多孔質構造を有し、内部の生分解性樹脂組成物中にエステル分解促進剤が分散されている、生分解性樹脂成形体。
- 前記多孔質構造表面の算術平均粗さSaが1.0μm以上である、請求項1に記載の生分解性樹脂成形体。
- エステル分解促進剤が酸放出性樹脂であり、前記酸放出性樹脂が放出する酸が、乳酸、シュウ酸、マレイン酸、又は、グリコール酸及びその組み合わせからなる群から選択される、請求項1又は2に記載の生分解性樹脂成形体。
- 前記酸放出性樹脂のFedors法から計算される溶解度パラメーターが22以上である、請求項1~3のいずれか1項に記載の生分解性樹脂成形体。
- 前記酸放出性樹脂がポリオキサレート及び/又はポリグリコール酸系樹脂である、請求項3又は4に記載の生分解性樹脂成形体。
- ペレット、フィルム、粉末、繊維、又は、フィルターの形態にある、請求項1~5のいずれか1項に記載の生分解性樹脂成形体。
- 酵素処理される前の生分解性樹脂成形体に対する重量減少率が40%以下である請求項1~6のいずれかに記載の生分解性樹脂成形体。
- 生分解性樹脂組成物中にエステル分解促進剤が分散してなる生分解性樹脂成形体の表面を処理する方法であって、加水分解酵素を含むpH9~12の範囲のリン酸含有溶液中で生分解性樹脂成形体を処理することを含む、生分解性樹脂成形体の表面処理方法。
- 酵素処理される前の生分解性樹脂組成物に対する重量減少率が40%以下である請求項8に記載の方法。
- 加水分解酵素がアルカリプロテアーゼである、請求項8又は9に記載の方法。
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WO2020014466A1 (en) | 2018-07-13 | 2020-01-16 | Novomer, Inc. | Polylactone foams and methods of making the same |
CN113735252A (zh) * | 2021-10-11 | 2021-12-03 | 广州科宝水处理科技股份有限公司 | 一种生物填料及其制备方法、废水处理方法 |
CN113880546A (zh) * | 2021-10-27 | 2022-01-04 | 杭州金鼎实业有限公司 | 一种碱式硫酸镁水泥混凝土及其制备方法 |
KR20230131143A (ko) * | 2022-03-04 | 2023-09-12 | 씨제이제일제당 (주) | 폴리락트산 수지 기화 촉진제 및 이를 포함하는 조성물 |
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