JP2000319446A - Biodegradable rubber composition - Google Patents
Biodegradable rubber compositionInfo
- Publication number
- JP2000319446A JP2000319446A JP11127324A JP12732499A JP2000319446A JP 2000319446 A JP2000319446 A JP 2000319446A JP 11127324 A JP11127324 A JP 11127324A JP 12732499 A JP12732499 A JP 12732499A JP 2000319446 A JP2000319446 A JP 2000319446A
- Authority
- JP
- Japan
- Prior art keywords
- polylactate
- filler
- natural rubber
- crepe
- rubber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、生分解性ゴム組成
物に関するものである。[0001] The present invention relates to a biodegradable rubber composition.
【０００２】[0002]
【従来の技術】従来、未加硫天然ゴムは生分解性、すな
わち廃棄されても環境汚染源とならず、時間の経過とと
もに加水分解されるか又は土中の微生物により分解され
る性質がある素材として知られている。2. Description of the Related Art Unvulcanized natural rubber has heretofore been a biodegradable material, that is, it is not a source of environmental pollution when discarded, and is hydrolyzed over time or decomposed by microorganisms in the soil. Also known as
【０００３】ところで、生分解性ゴム組成物として本発
明者はさきに、天然ゴムに磁石粉末を分散してなる植物
を活性化するゴム組成物を発明した（特開平８−２８３
４６０号公報参照）。The inventor of the present invention has previously invented a biodegradable rubber composition which activates plants by dispersing magnet powder in natural rubber (Japanese Patent Laid-Open No. 8-283).
No. 460).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記の
ゴム組成物は柔軟で自己接着性に優れるものの、実際に
植物に取り付けた場合、わずかな外部からの力や直射日
光などによって変形し、形状保持性に劣るという欠点が
ある。However, although the above rubber composition is flexible and excellent in self-adhesiveness, when it is actually attached to a plant, it is deformed by a slight external force or direct sunlight to maintain its shape. There is a drawback that the property is poor.
【０００５】また、生分解性樹脂の１つであるポリ乳酸
は、溶融時の粘度が極端に低下するため、押出成形性や
発泡成形性に劣るという欠点がある。Further, polylactic acid, which is one of the biodegradable resins, has a drawback that the viscosity at the time of melting is extremely reduced, and thus the extrusion moldability and the foam moldability are poor.
【０００６】本発明の目的は、ロールやバンバリーミキ
サーなどの通常のゴム混練機を用いて製造することがで
き、形状保持性に優れ、押出成形性や発泡成形性にも優
れた生分解性ゴム組成物を提供することにある。An object of the present invention is to provide a biodegradable rubber which can be produced by using a usual rubber kneader such as a roll or a Banbury mixer, has excellent shape retention, and has excellent extrudability and foamability. It is to provide a composition.
【０００７】[0007]
【課題を解決するための手段】本発明者は上記の目的を
達成するために鋭意検討の結果、生分解性樹脂と充填剤
とを併用することにより天然ゴム組成物の形状保持性、
押出成形性および発泡成形性を改善することが出来るこ
とを見出し、本発明を完成するに至った。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and have found that by using a biodegradable resin and a filler together, the shape retention of a natural rubber composition can be improved.
The present inventors have found that the extrusion moldability and the foam moldability can be improved, and have completed the present invention.
【０００８】すなわち本発明の生分解性ゴム組成物は、
天然ゴムに生分解樹脂と充填剤とを添加したことを特徴
とするものである。That is, the biodegradable rubber composition of the present invention comprises:
It is characterized by adding a biodegradable resin and a filler to natural rubber.
【０００９】[0009]
【発明の実施の形態】本発明に使用する天然ゴムの種類
は、リブドスモークドシート（ＲＳＳ）、ホワイトクレ
ープ、ペールクレープ、エステートブラウンクレープ、
コンポクレープ、薄手ブラウンクレープ、厚手ブランケ
ットクレープ、フラットバーククレープ、純スモークド
ブランケットクレープなどいずれでもよいが、経済性を
考えるとリブドスモークドシートが好ましい。BEST MODE FOR CARRYING OUT THE INVENTION The types of natural rubber used in the present invention are ribbed smoked sheet (RSS), white crepe, pale crepe, estate brown crepe,
Any of component crepe, thin brown crepe, thick blanket crepe, flat bark crepe, pure smoked blanket crepe and the like may be used, but ribbed smoked sheet is preferable in view of economic efficiency.
【００１０】本発明に使用する生分解性樹脂の種類は、
ポリ乳酸、脂肪族ポリエステル、ポリビニルアルコール
などいずれでもよいが、耐熱性に優れるポリ乳酸が好ま
しい。The kind of the biodegradable resin used in the present invention is as follows.
Any of polylactic acid, aliphatic polyester and polyvinyl alcohol may be used, but polylactic acid having excellent heat resistance is preferable.
【００１１】ポリ乳酸の添加量は、天然ゴム１００重量
部に対して５〜５００重量部の範囲が好ましい。ポリ乳
酸の添加量が５重量部未満であると成形品の形状保持効
果が極端に低下し、一方５００重量部を超えると混練が
困難になる。The amount of polylactic acid to be added is preferably in the range of 5 to 500 parts by weight based on 100 parts by weight of natural rubber. If the amount of polylactic acid is less than 5 parts by weight, the effect of maintaining the shape of the molded article is extremely reduced, while if it exceeds 500 parts by weight, kneading becomes difficult.
【００１２】本発明に使用するポリ乳酸の融点は、１０
０〜１７５℃が好ましい。ポリ乳酸の融点が１７５℃を
超えると、混練時に天然ゴムと充填剤の劣化が起こり、
一方１００℃未満であると、得られた成形品の耐熱性が
低下する。The melting point of the polylactic acid used in the present invention is 10
0-175 ° C is preferred. When the melting point of polylactic acid exceeds 175 ° C., the natural rubber and the filler deteriorate during kneading,
On the other hand, when the temperature is lower than 100 ° C., the heat resistance of the obtained molded product decreases.
【００１３】本発明に使用する充填剤は、混練時のゴム
のグリーン強度（グリーンストレングス）を増大させ、
かつ成形品の分解速度を制御できるものであればいずれ
を使用してもよいが、分解後に環境に及ぼす影響が小さ
いカーボンブラック、二酸化ケイ素、酸化チタン、水酸
化アルミ、ベントナイト、珪藻土、澱粉、木粉（セルロ
ース）、キチンなどが好ましい。The filler used in the present invention increases the green strength (green strength) of the rubber during kneading,
Any type can be used as long as it can control the decomposition rate of the molded product, but carbon black, silicon dioxide, titanium oxide, aluminum hydroxide, aluminum hydroxide, bentonite, diatomaceous earth, starch, wood Powder (cellulose), chitin and the like are preferred.
【００１４】充填剤の添加量は、天然ゴム１００重量部
に対して５〜３００重量部の範囲が好ましい。充填剤の
添加量が５重量部未満であるとグリーンストレングスが
低下するとともにロール作業性が劣り、一方３００重量
部を超えると混練が困難になる。The amount of the filler is preferably in the range of 5 to 300 parts by weight based on 100 parts by weight of the natural rubber. If the amount of the filler is less than 5 parts by weight, the green strength is reduced and the roll workability is poor. On the other hand, if it exceeds 300 parts by weight, kneading becomes difficult.
【００１５】[0015]
【実施例】以下に実施例および比較例を挙げて本発明を
さらに詳しく説明するが、本発明の態様はそれらの実施
例に限定されるものではない。The present invention will be described in more detail with reference to examples and comparative examples, but the embodiments of the present invention are not limited to these examples.
【００１６】実施例１ 天然ゴムとしてリブドスモークドシート（ＲＳＳ）１０
０重量部に、生分解性樹脂としてポリ乳酸（融点１２０
℃）３００重量部および充填剤としてシリカ（商品名Ｖ
Ｎ３、日本シリカ株式会社製）３０重量部を添加し、ロ
ールを用いて混練しゴム組成物を得た。Example 1 A ribbed smoked sheet (RSS) 10 as natural rubber
0 parts by weight of polylactic acid as a biodegradable resin (melting point 120
C) 300 parts by weight and silica as a filler (trade name V
N3, manufactured by Nippon Silica Co., Ltd.) was added and kneaded using a roll to obtain a rubber composition.
【００１７】実施例２ シリカ３０重量部に代えてベントナイト１５０重量部を
使用した以外は実施例１と同様にしてゴム組成物を得
た。Example 2 A rubber composition was obtained in the same manner as in Example 1, except that 150 parts by weight of bentonite was used instead of 30 parts by weight of silica.
【００１８】実施例３ 融点１２０℃のポリ乳酸３００重量部に代えて、融点１
６０℃のポリ乳酸３００重量部を使用した以外は実施例
１と同様にしてゴム組成物を得た。Example 3 A melting point of 1 instead of 300 parts by weight of polylactic acid having a melting point of 120 ° C.
A rubber composition was obtained in the same manner as in Example 1 except that 300 parts by weight of polylactic acid at 60 ° C. was used.
【００１９】比較例１ シリカ（ＶＮ３）３０重量部を添加しない以外は実施例
１と同様にしてゴム組成物を得た。Comparative Example 1 A rubber composition was obtained in the same manner as in Example 1 except that 30 parts by weight of silica (VN3) was not added.
【００２０】比較例２ ポリ乳酸（融点１２０℃）３００重量部を添加しない以
外は実施例１と同様にしてゴム組成物を得た。Comparative Example 2 A rubber composition was obtained in the same manner as in Example 1 except that 300 parts by weight of polylactic acid (melting point: 120 ° C.) was not added.
【００２１】実施例１〜３および比較例１、２につい
て、ロール作業性および成形品の形状保持性を評価した
結果を以下に示す。With respect to Examples 1 to 3 and Comparative Examples 1 and 2, the results of evaluating the roll workability and the shape retention of the molded product are shown below.
【００２２】 実施例１ 実施例２ 実施例３ 比較例１ 比較例２ ロール作業性 〇 〇 〇 × 〇 成形品の形状保持性 〇 〇 〇 〇 × Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Roll workability 〇 〇 〇 × 形状 Shape retention of molded product 〇 〇 〇 〇 ×
【００２３】なおロール作業性および成形品の形状保持
性は、下記の評価基準に従って評価した。The roll workability and the shape retention of the molded product were evaluated according to the following evaluation criteria.
【００２４】〈ロール作業性の評価基準〉 〇：ロールに粘着せず、混練が容易。 ×：ロールに粘着し、混練が困難。<Evaluation Criteria for Roll Workability> 〇: Adhesion to the roll is not observed, and kneading is easy. X: Adhered to the roll and difficult to knead
【００２５】〈成形品の形状保持性の評価基準〉ロール
で２ｍｍシート状に成形し、ＪＩＳ Ｋ６２５１のダン
ベル状３号形に打ち抜き、２０ｍｍの標線を入れたの
ち、片方にクリップを取り付け、５０℃のオーブン内に
１２時間吊るした。その後、２０ｍｍの標線間の変形率
を測定した。<Evaluation Criteria for Shape Retention of Molded Product> A 2 mm sheet was formed with a roll, punched into a dumbbell-shaped No. 3 shape of JIS K6251, a 20 mm mark was inserted, and a clip was attached to one side. Hanged in an oven at 12 ° C for 12 hours. Thereafter, the deformation ratio between the marks of 20 mm was measured.
【００２６】ここでは、変形率を次式のように定義し
た。 変形率（％）＝［（δＬ−２０）／２０］Ｘ１００ （式中、δＬは５０℃で１２時間熱処理後の標線間の長
さ（ｍｍ）を示す）Here, the deformation ratio is defined as follows. Deformation rate (%) = [(δL−20) / 20] × 100 (where, δL indicates the length (mm) between marked lines after heat treatment at 50 ° C. for 12 hours)
【００２７】変形率（％）に基づく評価基準は次のとお
りである。 〇：変形率５％未満 △：変形率５〜１０％ ×：変形率１０％超The evaluation criteria based on the deformation rate (%) are as follows. 〇: Deformation rate of less than 5% △: Deformation rate of 5 to 10% ×: Deformation rate of more than 10%
【００２８】[0028]
【発明の効果】以上説明したように本発明の生分解性ゴ
ム組成物は、天然ゴムに生分解樹脂と充填剤とを添加
したものであるから、ロールやバンバリーミキサーなど
の通常のゴム混練機を用いて製造することができ、その
際ロールに粘着せず混練が容易であり、未加硫天然ゴ
ムに比べて成形品の硬度が高いため形状保持性に優れ、
ポリ乳酸単独の場合に比べて溶融粘度が大であるため
押出成形性や発泡成形性に優れ、充填剤の種類および
添加量を変えることにより分解速度を調節することがで
き、また肥料などを添加できるから、生分解性の基材と
してきわめて有用である。As described above, since the biodegradable rubber composition of the present invention is obtained by adding a biodegradable resin and a filler to natural rubber, it is possible to use a conventional rubber kneading machine such as a roll or a Banbury mixer. It is easy to knead without sticking to the roll at that time, and has excellent shape retention because the hardness of the molded product is higher than that of unvulcanized natural rubber,
The melt viscosity is higher than that of polylactic acid alone, so it excels in extrudability and foam moldability.The decomposition rate can be adjusted by changing the type and amount of filler, and fertilizer is added. Because it can be used, it is extremely useful as a biodegradable substrate.
Claims (1)
したことを特徴とする生分解性ゴム組成物。1. A biodegradable rubber composition characterized by adding a biodegradable resin and a filler to natural rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11127324A JP2000319446A (en) | 1999-05-07 | 1999-05-07 | Biodegradable rubber composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11127324A JP2000319446A (en) | 1999-05-07 | 1999-05-07 | Biodegradable rubber composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000319446A true JP2000319446A (en) | 2000-11-21 |
Family
ID=14957124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11127324A Pending JP2000319446A (en) | 1999-05-07 | 1999-05-07 | Biodegradable rubber composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000319446A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005044922A1 (en) * | 2003-11-07 | 2005-05-19 | Nature Trust Inc. | Bio-degradable/disintegratable resin composition |
| JP2005336414A (en) * | 2004-05-31 | 2005-12-08 | Toyota Motor Corp | Resin composition and molded product therefrom |
| EP1749855A2 (en) | 2005-08-04 | 2007-02-07 | Sumtiomo Rubber Industries Ltd | Rubber composition and pneumatic tire using the same |
| JP2008038124A (en) * | 2006-08-04 | 2008-02-21 | Sumitomo Rubber Ind Ltd | Rubber composition and pneumatic tire produced by using the same |
| EP1950053A1 (en) | 2007-01-26 | 2008-07-30 | Seed Company Ltd. | Elastomer composition, method for producing the same, and eraser using the same |
| EP2058368A1 (en) | 2007-11-08 | 2009-05-13 | Seed Company Ltd. | Elastomer composition, method for producing the same, and eraser using the same |
| WO2010010696A1 (en) | 2008-07-25 | 2010-01-28 | 株式会社シード | Abrasive-containing eraser |
| CN104151726A (en) * | 2014-07-17 | 2014-11-19 | 安徽巢湖南方膜业有限责任公司 | Methylbenzene-polyvinyl alcohol degradable plastic film composition and preparation method thereof |
| CN104151757A (en) * | 2014-07-17 | 2014-11-19 | 安徽巢湖南方膜业有限责任公司 | Formula of polyurethane-polyvinyl alcohol double-degradable plastic film and preparation method of polyurethane-polyvinyl alcohol double-degradable plastic film |
| CN104151632A (en) * | 2014-07-17 | 2014-11-19 | 安徽巢湖南方膜业有限责任公司 | Natural rubber-polyvinyl alcohol dual-degradation plastic film formula and preparation method thereof |
| CN106030023A (en) * | 2014-03-07 | 2016-10-12 | 株式会社吴羽 | Degradable rubber member for downhole tool, degradable seal member, degradable protective member, downhole tool, and well-drilling method |
| US10208559B2 (en) | 2013-12-27 | 2019-02-19 | Kureha Corporation | Diameter-expandable annular degradable seal member for downhole tool, plug for well drilling, and method for well drilling |
-
1999
- 1999-05-07 JP JP11127324A patent/JP2000319446A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005044922A1 (en) * | 2003-11-07 | 2005-05-19 | Nature Trust Inc. | Bio-degradable/disintegratable resin composition |
| JP2005336414A (en) * | 2004-05-31 | 2005-12-08 | Toyota Motor Corp | Resin composition and molded product therefrom |
| CN100588678C (en) * | 2005-08-04 | 2010-02-10 | 住友橡胶工业株式会社 | Rubber composition and pneumatic tire using the same |
| EP1749855A2 (en) | 2005-08-04 | 2007-02-07 | Sumtiomo Rubber Industries Ltd | Rubber composition and pneumatic tire using the same |
| EP1749855A3 (en) * | 2005-08-04 | 2009-03-18 | Sumtiomo Rubber Industries Ltd | Rubber composition and pneumatic tire using the same |
| US8281832B2 (en) | 2005-08-04 | 2012-10-09 | Sumitomo Rubber Industries, Ltd. | Rubber composition and pneumatic tire using the same |
| JP2008038124A (en) * | 2006-08-04 | 2008-02-21 | Sumitomo Rubber Ind Ltd | Rubber composition and pneumatic tire produced by using the same |
| EP1950053A1 (en) | 2007-01-26 | 2008-07-30 | Seed Company Ltd. | Elastomer composition, method for producing the same, and eraser using the same |
| US7732523B2 (en) | 2007-01-26 | 2010-06-08 | Seed Company Ltd. | Elastomer composition, method for producing the same, and eraser using the same |
| EP2058368A1 (en) | 2007-11-08 | 2009-05-13 | Seed Company Ltd. | Elastomer composition, method for producing the same, and eraser using the same |
| WO2010010696A1 (en) | 2008-07-25 | 2010-01-28 | 株式会社シード | Abrasive-containing eraser |
| US10208559B2 (en) | 2013-12-27 | 2019-02-19 | Kureha Corporation | Diameter-expandable annular degradable seal member for downhole tool, plug for well drilling, and method for well drilling |
| CN106030023A (en) * | 2014-03-07 | 2016-10-12 | 株式会社吴羽 | Degradable rubber member for downhole tool, degradable seal member, degradable protective member, downhole tool, and well-drilling method |
| US10280699B2 (en) | 2014-03-07 | 2019-05-07 | Kureha Corporation | Degradable rubber member for downhole tools, degradable seal member, degradable protecting member, downhole tool, and method for well drilling |
| CN110242244A (en) * | 2014-03-07 | 2019-09-17 | 株式会社吴羽 | Drilling well blanking plug |
| CN104151726A (en) * | 2014-07-17 | 2014-11-19 | 安徽巢湖南方膜业有限责任公司 | Methylbenzene-polyvinyl alcohol degradable plastic film composition and preparation method thereof |
| CN104151757A (en) * | 2014-07-17 | 2014-11-19 | 安徽巢湖南方膜业有限责任公司 | Formula of polyurethane-polyvinyl alcohol double-degradable plastic film and preparation method of polyurethane-polyvinyl alcohol double-degradable plastic film |
| CN104151632A (en) * | 2014-07-17 | 2014-11-19 | 安徽巢湖南方膜业有限责任公司 | Natural rubber-polyvinyl alcohol dual-degradation plastic film formula and preparation method thereof |
| CN104151726B (en) * | 2014-07-17 | 2016-06-01 | 安徽巢湖南方膜业有限责任公司 | A kind of chlorosulfonated polyethylene-polyvinyl alcohol double degradation plastic film formula and its preparation method |
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