JP4321688B2 - Polyester polyurethane composition - Google Patents
Polyester polyurethane composition Download PDFInfo
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- JP4321688B2 JP4321688B2 JP13487099A JP13487099A JP4321688B2 JP 4321688 B2 JP4321688 B2 JP 4321688B2 JP 13487099 A JP13487099 A JP 13487099A JP 13487099 A JP13487099 A JP 13487099A JP 4321688 B2 JP4321688 B2 JP 4321688B2
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- Prior art keywords
- polyester polyurethane
- polyester
- plasticizer
- polyurethane composition
- weight
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Description
【０００１】
【発明の属する技術分野】
本発明は、新規な可塑剤を含有するポリエステルポリウレタン組成物に関する。
【０００２】
【従来の技術】
従来より、ポリエステルポリウレタンは耐油性に優れることを特長とし、極性が高いので、広く用いられているジオクチルフタレート（ＤＯＰ）などの可塑剤を大量に含有させることは困難であった。ポリエステルウレタンエラストマー向けの可塑剤としては、ジブチルフタレート（ＤＢＰ）、ジエチレングリコールエステル、ジプロピレングリコールジベンゾエート（特公平６−２９１１３号公報参照）などの限定したものしか使用が困難であり、しかもポリウレタンの持つ優れた物性を維持するため添加量は２０ｐｈｒ程度を上限とするよう推奨されていた。
【０００３】
【発明が解決しようとする課題】
しかしながら、ＤＢＰ等は揮発性が大きく高温での長期使用に難点があり、また、脂肪族エーテル結合を含むジグリコールエステル系は耐酸化性や吸湿性に問題があり、ポリエステルポリウレタンの特長である高強度・耐摩耗性を最大限に活かすことができる可塑剤の出現が望まれている。
【０００４】
本発明は、このような事情に鑑み、ポリエステルポリウレタンに好適な新規な可塑剤を用いたポリエステルウレタン組成物を提供することを課題とする。
【０００５】
【課題を解決するための手段】
上記課題を解決する本発明の第１の態様は、ポリエステルジオールをジイソシアネートで連結して得られるポリエステルポリウレタン組成物であって、炭素数が４のアルキルアルコールと、トリメリット酸とから得られるエステル化合物を可塑剤として含有することを特徴とするポリエステルポリウレタン組成物にある。
【０００６】
本発明の第２の態様は、第１の態様において、前記ポリエステルジオールのエステル基含有量が４５重量％以下であることを特徴とするポリエステルポリウレタン組成物にある。
【０００７】
本発明の第３の態様は、第１又は２の態様において、前記ポリエステルポリウレタン１００重量部に対して、前記可塑剤を２０重量部以上含有することを特徴とするポリエステルポリウレタン組成物にある。
【０００８】
本発明の第４の態様は、第１〜３の何れかの態様において、前記ポリエステルポリウレタン１００重量部に対して、前記可塑剤存在下にてポリウレタン生成反応が行われたことを特徴とするポリエステルポリウレタン組成物にある。
【０００９】
本発明の第５の態様は、第１〜４の何れかの態様において、前記ポリエステルポリウレタンがポリ−ε−カプロラクトンポリウレタンであることを特徴とするポリエステルポリウレタン組成物にある。
【００１０】
本発明の第６の態様は、第１〜５の何れかの態様において、前記可塑剤がトリメリット酸トリブチルであることを特徴とするポリエステルポリウレタン組成物にある。
【００１１】
本発明のポリエステルポリウレタン組成物は、炭素数が４〜６のアルキルアルコールと、トリメリット酸、ピロメリット酸及びセバシン酸からなる群から選択されるポリカルボン酸とから得られるエステル化合物を可塑剤として含有する。これらのエステル化合物はポリウレタン用の可塑剤としては新規な化合物であり、特に、ポリエステルポリウレタンとの相溶性に優れてブリードの虞がなく、揮発性も高くなく、且つ低温特性を改良できるという利点があり、特に低硬度エラストマーの調製に効果がある。
【００１２】
ポリカルボン酸としては、特にトリメリット酸が好適であり、アルキルアルコールとしてはブチルアルコール、又はイソブチルアルコールが好適である。すなわち、トリブチルトリメリテート又はトリイソブチルトリメリテートはＤＯＰと同等の沸点であり且つポリエステルウレタンとの相溶性が高い。
【００１３】
一方、本発明で用いるポリエステルポリウレタンは、好適には混練型ポリウレタンであるが、ポリオールのエステル結合部分の割合が、４５重量％以下のものが好ましい。このようなポリオールとしては、ポリ−ε−カプロラクトン系ジオールを主成分としたものがあるが、その他、例えば、３−メチル−１，５−ペンタンジオールアジペート系ポリオールで、当該ポリオール中のメチルペンタンジオール／アジピン酸の比が７０％以上であり、当該ポリオールの数平均分子量が１５００〜５０００の範囲にあるものなどを挙げることができる。
【００１４】
強度、耐摩耗性の点で、メチル基などの側鎖を含有しないポリオールが優れている。特にポリ−ε−カプロラクトン系ジオールを主成分とするものが好適である。しかしながら、ポリカプロラクトンは、結晶性が強いため、低硬度品に使用することは低温時の結晶化のため困難であるが、本発明の可塑剤を用いると、低硬度と耐摩耗性との両立を図ることができる。この点は従来の低硬度かつ高強度なエラストマーとして用いられている高分子量のＥＰＤＭ、ポリエチリデンノルボルネン、塩素化ポリエチレン系の油展エラストマーに比べ卓越した強度、耐摩耗性を示す事が明らかとなった。
【００１５】
【発明の実施の形態】
以下、実施例により本発明をさらに詳細に説明するが、これらの実施例は本発明の範囲を何ら限定するものではない。
【００１６】
（実施例１〜８）
ポリエステルジオールとして分子量１２５０のポリ−ε−カプロラクトン（ＰＣＬ）と、エチレン・ブチレン（モル比５０：５０）アジペートとを用いた。エステル基濃度はそれぞれ、３９％および４７％である。このポリエステルジオールに対し等モルのＭＤＩ（４，４’−ジフェニルメタンジイソシアネート）を反応させて混練り型ウレタンを得た。この混練り型ウレタン１００重量部に対し、可塑剤としてトリメリット酸トリブチル（ＴＢＴＭ）を所定量混合し、さらに２重量部のジクミルパーオキシド（パークミルＤ、日本油脂（株）製）を添加し混練りした後、１６０℃で２０分熱プレスにより２ミリ厚のシートを作製した。
【００１７】
得られたサンプルを１０℃の冷蔵庫に１週間保管し、可塑剤のブリードを観察した結果を下記表１および表２に示す。ここで、充填不能とは混練り中にブリードが発生しロール混練りが不可能になった事を示す。
【００１８】
（比較例１〜１６）
比較のため、可塑剤をジオクチルフタレート（ＤＯＰ）およびジヘキシルフタレート（ＤＨＰ）にかえた以外は同様にした。
【００１９】
【表１】
【表２】
（実施例９〜１１）
ＴＢＴＭ２０，５０，１００ｐｈｒをそれぞれ存在させた状態において実施例１と同様にウレタン化反応を行い混練り型ウレタンを得た。
【００２２】
架橋体の物性値を下記表３に示す。ここで、硬度はＪＩＳ Ｋ６２５３により、破断強度はＪＩＳ Ｋ６２５１により、圧縮永久ひずみはＪＩＳ Ｋ６２６２により、アクロン摩耗量はＪＩＳ Ｋ６２６４に基づいて傾角１５度、荷重２７．０Ｎにより、それぞれ測定した。
【００２３】
（比較例１７〜１９）
比較として、下記表４に示す配合で硬度約３５Ａに調製した低硬度エラストマーについての物性値を同様に表３に示す。
【００２４】
【表３】
【表４】
以上の結果より、ポリエステル系ポリウレタンに対し、特定の構造を有する可塑剤を選定することにより、可塑剤を高濃度且つ安定に含有させることが可能となり、しかもポリエステルポリウレタンの有する卓越した高強度・耐摩耗性を維持できることが判明した。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyester polyurethane composition containing a novel plasticizer.
[0002]
[Prior art]
Conventionally, polyester polyurethane is characterized by excellent oil resistance and has high polarity, so it has been difficult to contain a large amount of a plasticizer such as dioctyl phthalate (DOP) which is widely used. As plasticizers for polyester urethane elastomers, only limited ones such as dibutyl phthalate (DBP), diethylene glycol ester, dipropylene glycol dibenzoate (see Japanese Patent Publication No. 6-29113) are difficult to use, and polyurethane has In order to maintain excellent physical properties, the addition amount was recommended to be about 20 phr.
[0003]
[Problems to be solved by the invention]
However, DBP and the like are highly volatile and have difficulties in long-term use at high temperatures, and the diglycol ester system containing an aliphatic ether bond has problems with oxidation resistance and hygroscopicity. The appearance of a plasticizer that can make the most of strength and wear resistance is desired.
[0004]
In view of such circumstances, an object of the present invention is to provide a polyester urethane composition using a novel plasticizer suitable for polyester polyurethane.
[0005]
[Means for Solving the Problems]
A first aspect of the present invention for solving the aforementioned problems is a polyester polyurethane composition obtained by connecting a polyester diol with a diisocyanate, and an alkyl alcohol having a carbon number of 4, an ester compound obtained from trimellitic acid Is contained in a polyester polyurethane composition characterized in that it contains as a plasticizer.
[0006]
According to a second aspect of the present invention, there is provided the polyester polyurethane composition according to the first aspect, wherein the polyester diol has an ester group content of 45% by weight or less.
[0007]
A third aspect of the present invention is the polyester polyurethane composition according to the first or second aspect, wherein the plasticizer contains 20 parts by weight or more of the plasticizer with respect to 100 parts by weight of the polyester polyurethane.
[0008]
According to a fourth aspect of the present invention, in any one of the first to third aspects, a polyester forming reaction is performed in the presence of the plasticizer with respect to 100 parts by weight of the polyester polyurethane. In the polyurethane composition.
[0009]
According to a fifth aspect of the present invention, there is provided the polyester polyurethane composition according to any one of the first to fourth aspects, wherein the polyester polyurethane is poly-ε-caprolactone polyurethane.
[0010]
A sixth aspect of the present invention is the polyester polyurethane composition according to any one of the first to fifth aspects, wherein the plasticizer is tributyl trimellitic acid.
[0011]
The polyester polyurethane composition of the present invention uses, as a plasticizer, an ester compound obtained from an alkyl alcohol having 4 to 6 carbon atoms and a polycarboxylic acid selected from the group consisting of trimellitic acid, pyromellitic acid and sebacic acid. contains. These ester compounds are novel compounds as plasticizers for polyurethanes. In particular, they have the advantage that they are excellent in compatibility with polyester polyurethane, have no fear of bleeding, are not highly volatile, and can improve low-temperature characteristics. In particular, it is effective in preparing a low hardness elastomer.
[0012]
As the polycarboxylic acid, trimellitic acid is particularly preferable, and as the alkyl alcohol, butyl alcohol or isobutyl alcohol is preferable. That is, tributyl trimellitate or triisobutyl trimellitate has the same boiling point as DOP and high compatibility with polyester urethane.
[0013]
On the other hand, the polyester polyurethane used in the present invention is preferably a kneaded polyurethane, but it is preferable that the ratio of the ester bond portion of the polyol is 45% by weight or less. Examples of such polyols include those based on poly-ε-caprolactone-based diols. Other examples include 3-methyl-1,5-pentanediol adipate-based polyols, and methylpentanediol in the polyols. The ratio of / adipic acid is 70% or more, and the number average molecular weight of the polyol is in the range of 1500 to 5000.
[0014]
A polyol that does not contain a side chain such as a methyl group is excellent in terms of strength and wear resistance. Particularly preferred are those containing poly-ε-caprolactone-based diol as a main component. However, polycaprolactone has strong crystallinity, so it is difficult to use it in low hardness products due to crystallization at low temperatures. However, when the plasticizer of the present invention is used, both low hardness and wear resistance are achieved. Can be achieved. It is clear that this point shows superior strength and wear resistance compared to high-molecular weight EPDM, polyethylidene norbornene, and chlorinated polyethylene oil-extended elastomers used as conventional low-hardness and high-strength elastomers. It was.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, these Examples do not limit the scope of the present invention at all.
[0016]
(Examples 1-8)
As the polyester diol, poly-ε-caprolactone (PCL) having a molecular weight of 1250 and ethylene butylene (molar ratio 50:50) adipate were used. The ester group concentrations are 39% and 47%, respectively. This polyester diol was reacted with equimolar MDI (4,4′-diphenylmethane diisocyanate) to obtain a kneaded urethane. To 100 parts by weight of this kneaded urethane, a predetermined amount of tributyl trimellitic acid (TBTM) is mixed as a plasticizer, and 2 parts by weight of dicumyl peroxide (Park Mill D, manufactured by NOF Corporation) is added. After kneading, a 2 mm thick sheet was produced by hot pressing at 160 ° C. for 20 minutes.
[0017]
The obtained samples were stored in a refrigerator at 10 ° C. for 1 week, and the results of observing plasticizer bleed are shown in Tables 1 and 2 below. Here, impossibility of filling means that bleeding occurred during kneading and roll kneading became impossible.
[0018]
(Comparative Examples 1-16)
For comparison, the same procedure was followed except that the plasticizer was changed to dioctyl phthalate (DOP) and dihexyl phthalate (DHP).
[0019]
[Table 1]
[Table 2]
(Examples 9 to 11)
In the state where TBTM20, 50, and 100 phr were present, urethanization reaction was performed in the same manner as in Example 1 to obtain a kneaded urethane.
[0022]
The physical properties of the crosslinked product are shown in Table 3 below. Here, the hardness was measured according to JIS K6253, the breaking strength was measured according to JIS K6251, the compression set was measured according to JIS K6262, and the acron wear was measured according to JIS K6264 at an inclination of 15 degrees and a load of 27.0 N.
[0023]
(Comparative Examples 17-19)
For comparison, the physical properties of a low hardness elastomer prepared to a hardness of about 35 A with the formulation shown in Table 4 below are also shown in Table 3.
[0024]
[Table 3]
[Table 4]
From the above results, by selecting a plasticizer having a specific structure for the polyester-based polyurethane, it becomes possible to contain the plasticizer at a high concentration and stably, and the polyester polyurethane has excellent high strength and resistance. It was found that the wearability can be maintained.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13487099A JP4321688B2 (en) | 1999-05-14 | 1999-05-14 | Polyester polyurethane composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13487099A JP4321688B2 (en) | 1999-05-14 | 1999-05-14 | Polyester polyurethane composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000319502A JP2000319502A (en) | 2000-11-21 |
| JP4321688B2 true JP4321688B2 (en) | 2009-08-26 |
Family
ID=15138412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13487099A Expired - Lifetime JP4321688B2 (en) | 1999-05-14 | 1999-05-14 | Polyester polyurethane composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4321688B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6911491B2 (en) * | 2001-04-20 | 2005-06-28 | Rohm And Haas Company | Hot melt adhesive |
| US20220081561A1 (en) * | 2019-01-09 | 2022-03-17 | Avient Corporation | Thermoplastic polyurethane compounds exhibiting enhanced stain resistance |
| US11697733B2 (en) | 2019-01-09 | 2023-07-11 | Avient Corporation | Thermoplastic polyurethane compounds exhibiting stain resistance and enhanced UV stability |
| CN112480361B (en) * | 2020-12-01 | 2022-03-08 | 上海恒安聚氨酯股份有限公司 | Preparation method of moisture-permeable thermoplastic polyurethane film |
-
1999
- 1999-05-14 JP JP13487099A patent/JP4321688B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JP2000319502A (en) | 2000-11-21 |
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