JP2008298601A - Method for measuring neutralization degree of ionomer resin - Google Patents

Method for measuring neutralization degree of ionomer resin Download PDF

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JP2008298601A
JP2008298601A JP2007145372A JP2007145372A JP2008298601A JP 2008298601 A JP2008298601 A JP 2008298601A JP 2007145372 A JP2007145372 A JP 2007145372A JP 2007145372 A JP2007145372 A JP 2007145372A JP 2008298601 A JP2008298601 A JP 2008298601A
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ionomer resin
infrared absorption
absorption spectrum
neutralization
peak height
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Masuhiro Iida
益大 飯田
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for accurately measuring the neutralization degree of ionomer resin capable of reducing the variations in infrared absorption spectra, a method for calculating the neutralization degree of the ionomer resin by measuring infrared absorption spectra. <P>SOLUTION: In this neutralization degree measuring method of the ionomer resin, infrared absorption spectrum of a sample of the ionomer resin is measured, a peak height A of 1,700 cm<SP>-1</SP>and a peak height B of 2,915 cm<SP>-1</SP>are calculated; the sample of the ionomer resin is brought into contact with hydrochloric acid containing alcohol; the infrared absorption spectrum is measured, after removing a metal ion in the ionomer resin; a peak height C of 1700 cm<SP>-1</SP>and a peak height D of 2,915 cm<SP>-1</SP>are calculated; and the calculated value by using expression 100-100×(A/B)/(C/D) is the degree of neutralization (%). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、エチレン等と不飽和カルボン酸との共重合体を、ナトリウムや亜鉛等の金属イオンにより分子間架橋してなるアイオノマー樹脂の中和度測定方法に関する。   The present invention relates to a method for measuring the degree of neutralization of an ionomer resin obtained by intermolecular crosslinking of a copolymer of ethylene or the like and an unsaturated carboxylic acid with a metal ion such as sodium or zinc.

エチレン等と、アクリル酸やメタクリル酸等の不飽和カルボン酸との共重合体に、ナトリウム(Na)や亜鉛(Zn)等の金属イオンを作用させて分子間架橋してなるアイオノマー樹脂は、強度と溶融加工性の両立が可能なポリマーとして知られており、包装材料、ゴルフボール、自動車部品、靴材料、工具、建材、電線等の成形品材料として使用されている。   An ionomer resin made by intermolecular cross-linking of a metal ion such as sodium (Na) or zinc (Zn) with a copolymer of ethylene or the like and an unsaturated carboxylic acid such as acrylic acid or methacrylic acid is strong. It is known as a polymer that can be compatible with melt processability, and is used as a molding material for packaging materials, golf balls, automobile parts, shoe materials, tools, building materials, electric wires, and the like.

一般に、共有結合で架橋したポリマーは、熱可塑性プラスチックとしての成形が不可能である。しかし、イオン結合による分子間架橋は加熱すると剪断力で切れるので、アイオノマー樹脂は、加熱により流動性を示す。その結果、通常の熱可塑性プラスチックと同様な成形が可能となる。一方、常温に冷却すると再び元の分子間架橋を生じ、架橋された樹脂としての優れた特性が得られる。   In general, covalently crosslinked polymers are not moldable as thermoplastics. However, since intermolecular crosslinking by ionic bonds is broken by shearing force when heated, the ionomer resin exhibits fluidity when heated. As a result, molding similar to that of ordinary thermoplastics becomes possible. On the other hand, when cooled to room temperature, the original intermolecular crosslinking occurs again, and excellent properties as a crosslinked resin are obtained.

アイオノマー樹脂では、不飽和カルボン酸に由来するカルボキシル基間が、当該カルボキシル基にイオン結合した金属イオンにより架橋される。そして、アイオノマー樹脂の特性、すなわち、耐摩耗性、高反撥弾性、透明性や接着性等は、金属イオンと結合したカルボキシル基の割合、すなわち中和度により大きく影響されることが知られている。従って、中和度は、アイオノマー樹脂の材料特性を評価する上で不可欠なパラメーターであり、中和度の測定が、材料としての受け入れ検査や製品としての品質管理において行われている。   In the ionomer resin, the carboxyl groups derived from the unsaturated carboxylic acid are cross-linked by metal ions ionically bonded to the carboxyl group. And it is known that the properties of the ionomer resin, that is, abrasion resistance, high rebound resilience, transparency, adhesion, etc. are greatly influenced by the proportion of carboxyl groups bonded to metal ions, that is, the degree of neutralization. . Accordingly, the degree of neutralization is an indispensable parameter for evaluating the material properties of the ionomer resin, and the measurement of the degree of neutralization is performed in the acceptance inspection as a material and the quality control as a product.

アイオノマー樹脂の中和度を測定する方法としては、アイオノマー樹脂の赤外吸収スペクトル測定による方法が、特許文献1等に開示されており、中和度を迅速、簡易に測定できる方法として知られている。この方法は、赤外吸収スペクトルにおける、C=O伸縮に相当する1700cm−1の吸収は、カルボキシル基のイオン化(金属イオンとのイオン結合)の割合に応じて減少することを利用したものであり、具体的には、以下に示す手順で行われる。 As a method for measuring the degree of neutralization of an ionomer resin, a method based on infrared absorption spectrum measurement of an ionomer resin is disclosed in Patent Document 1 and the like, and is known as a method capable of measuring the degree of neutralization quickly and easily. Yes. This method utilizes the fact that the absorption at 1700 cm −1 corresponding to C═O stretching in the infrared absorption spectrum decreases in accordance with the ratio of ionization of carboxyl groups (ion bonds with metal ions). Specifically, the procedure is as follows.

アイオノマー樹脂の試料の赤外吸収スペクトルの測定を行い、1700cm−1の吸収のピーク高さを求める(ピーク高さをaとする。)。又、アイオノマー樹脂の試料を、塩酸と接触させてアイオノマー樹脂中の金属イオンを除去し(脱メタル化)、イオン結合(分子内架橋)がされていない酸共重合体を得る。この酸共重合体の試料の赤外吸収スペクトルの測定を行い、1700cm−1の吸収のピーク高さを求める(ピーク高さをbとする。)。 The infrared absorption spectrum of the ionomer resin sample is measured, and the peak height of absorption at 1700 cm −1 is obtained (the peak height is a). Further, a sample of the ionomer resin is brought into contact with hydrochloric acid to remove metal ions in the ionomer resin (demetalation), thereby obtaining an acid copolymer that is not ion-bonded (intramolecularly crosslinked). The infrared absorption spectrum of this acid copolymer sample is measured to determine the peak height of absorption at 1700 cm −1 (the peak height is b).

ピーク高さをaは、アイオノマー樹脂中のイオン結合がされていないカルボキシル基の数に対応し、ピーク高さをbは、アイオノマー樹脂中の全てのカルボキシル基の数に対応するので、下記の式により、中和度(%)を得ることができる。
中和度(%)=100−100×a/b
特開2000−63593号公報
The peak height a corresponds to the number of carboxyl groups that are not ionically bonded in the ionomer resin, and the peak height b corresponds to the number of all carboxyl groups in the ionomer resin. Thus, the degree of neutralization (%) can be obtained.
Degree of neutralization (%) = 100-100 × a / b
JP 2000-63593 A

しかし、特許文献1等に開示されている方法では、赤外吸収スペクトルのばらつきが大きく、正確なデータが得られないとの問題があった。例えば、図2は、特許文献1に開示されている方法に準じて行われた比較例で得られたアイオノマー樹脂の脱メタル後の赤外吸収スペクトルであり、3回行った測定のそれぞれのスペクトルを示すが、スペクトル間に、大きなばらつきがあることが確認できる。   However, the method disclosed in Patent Document 1 has a problem that the infrared absorption spectrum varies greatly and accurate data cannot be obtained. For example, FIG. 2 is an infrared absorption spectrum after demetalization of an ionomer resin obtained in a comparative example performed in accordance with the method disclosed in Patent Document 1, and each spectrum of measurements performed three times. It can be confirmed that there is a large variation between the spectra.

本発明は、赤外吸収スペクトルの測定により、アイオノマー樹脂の中和度を求める方法であって、赤外吸収スペクトルのばらつきが小さく、アイオノマー樹脂の中和度の正確な測定を可能にする方法を提供することを課題とする。   The present invention relates to a method for determining the degree of neutralization of an ionomer resin by measuring an infrared absorption spectrum, and a method that enables accurate measurement of the degree of neutralization of an ionomer resin with little variation in the infrared absorption spectrum. The issue is to provide.

本発明者は、前記課題を解決するため鋭意検討した結果、前記の特許文献1等に開示されている方法において、塩酸に換えて、アルコールを含有する塩酸(アルコール性塩酸)を用いることにより、赤外吸収スペクトルのばらつきが小さくなり、アイオノマー樹脂の中和度の正確な測定が可能となることを見出し、本発明を完成するに至った。   As a result of intensive studies to solve the above problems, the present inventor, in the method disclosed in Patent Document 1 and the like, by using hydrochloric acid containing alcohol (alcoholic hydrochloric acid) instead of hydrochloric acid, It has been found that variations in the infrared absorption spectrum are reduced, and that the neutralization degree of the ionomer resin can be accurately measured, and the present invention has been completed.

即ち、本発明は、アイオノマー樹脂の試料の赤外吸収スペクトルを測定し、その1700cm−1のピーク高さA及び2915cm−1のピーク高さBを求めると共に、
前記アイオノマー樹脂の試料を、アルコールを含有する塩酸と接触させて、前記アイオノマー樹脂中の金属イオンを除去した後に赤外吸収スペクトルを測定し、その1700cm−1のピーク高さC及び2915cm−1のピーク高さDを求め、
式:100−100×(A/B)/(C/D)による計算値を中和度(%)とすることを特徴とする、アイオノマー樹脂の中和度測定方法を提供するものである(請求項1)。
That is, the present invention is to provide measuring the infrared absorption spectrum of a sample of the ionomer resins, obtains the peak height B of the peak height A and 2915 cm -1 of the 1700 cm -1,
The sample of the ionomer resin was brought into contact with hydrochloric acid containing alcohol to remove metal ions in the ionomer resin, and an infrared absorption spectrum was measured. The peak height C of 1700 cm −1 and 2915 cm −1 were measured. Find the peak height D,
The present invention provides a method for measuring the degree of neutralization of an ionomer resin, characterized in that the calculation value according to the formula: 100-100 × (A / B) / (C / D) is defined as the degree of neutralization (%) ( Claim 1).

本発明の中和度測定方法の対象となるアイオノマー樹脂とは、前記のように、エチレン等と、アクリル酸やメタクリル酸等の不飽和カルボン酸との共重合体に、NaやZn等の金属イオンを作用させて分子間架橋してなる樹脂であるが、このようなエチレン系アイオノマーの他に、ウレタン系、スチレン系やフッ素系高分子を使用したアイオノマー樹脂も本発明の中和度測定方法の対象となる。又、金属イオンとしては、NaやZn以外にもマグネシウム、カルシウム等を挙げることができる。   As described above, the ionomer resin to be subjected to the neutralization degree measurement method of the present invention is a copolymer of ethylene or the like and an unsaturated carboxylic acid such as acrylic acid or methacrylic acid, or a metal such as Na or Zn. The resin is formed by intermolecular crosslinking by the action of ions. In addition to such ethylene ionomers, ionomer resins using urethane-based, styrene-based or fluorine-based polymers can also be used for the neutralization degree measuring method of the present invention. It becomes the object of. In addition to Na and Zn, examples of metal ions include magnesium and calcium.

本発明の中和度測定方法では、試料となるアイオノマー樹脂の赤外吸収スペクトルを測定し、その1700cm−1のピーク高さA及び2915cm−1のピーク高さBを求める。ここで、2915cm−1の吸収はCH伸縮による吸収である。赤外吸収スペクトル測定をATR法で実施する場合、試料の形状や測定時のATR結晶の接触圧等が誤差要因となる可能性があるが、A/Bを求めて1700cm−1の吸収の値Aを規格化することにより、これらの誤差要因の影響を除去することができる。 Degree of neutralization measuring method of the present invention, measuring the infrared absorption spectrum of the ionomer resin as a sample to determine the peak height B of the peak height A and 2915 cm -1 of the 1700 cm -1. Here, absorption at 2915 cm −1 is absorption due to CH 2 expansion and contraction. When carrying out the infrared absorption spectrum measured by ATR method, there is a possibility that the contact pressure and the like may cause an error of a sample of the shape and measurements at the ATR crystal, the absorption of 1700 cm -1 seeking A / B value By normalizing A, the influence of these error factors can be removed.

さらに、前記の赤外吸収スペクトルの測定とともに、アイオノマー樹脂の試料を、アルコール性塩酸と接触させて、前記アイオノマー樹脂中の金属イオンを除去した後に赤外吸収スペクトルを測定し、その1700cm−1のピーク高さC及び2915cm−1のピーク高さDを求める。 Further, the with a measurement of the infrared absorption spectrum of a sample of the ionomer resin is contacted with alcoholic hydrochloric acid, infrared absorption spectrum was measured after removing the metal ions of the ionomer resin, the 1700 cm -1 The peak height C and the peak height D of 2915 cm −1 are determined.

アイオノマー樹脂の試料とアルコール性塩酸と接触は、試料をアルコール性塩酸中に分散し、一定時間、共に振り混ぜる又は撹拌して行うことができる。接触時間は、アイオノマー樹脂中の金属イオンの除去が充分行われるために必要な時間であるが、金属イオンの除去は迅速に行われるので、通常、5〜10分程度である。   The sample of ionomer resin and alcoholic hydrochloric acid can be contacted by dispersing the sample in alcoholic hydrochloric acid and shaking or stirring together for a certain time. The contact time is a time required for sufficiently removing the metal ions in the ionomer resin, but is usually about 5 to 10 minutes because the metal ions are removed quickly.

そして、前記と同様に、C/Dを求めることにより、1700cm−1の吸収の値Cを規格化する。このようにして求めた、A、B、C及びDの値に基づき、式:100−100×(A/B)/(C/D)により中和度(%)を求めることができる。 Then, similarly to the above, the absorption value C of 1700 cm −1 is normalized by obtaining C / D. Based on the values of A, B, C and D thus obtained, the degree of neutralization (%) can be obtained by the formula: 100-100 × (A / B) / (C / D).

本発明は、アイオノマー樹脂を脱メタル処理するために、アルコール性塩酸を用いることを特徴とする。前記の従来の方法においては、アイオノマー樹脂を脱メタル処理するために、アルコールを含有しない一般的な塩酸が用いられていた。しかし、一般的な塩酸では、樹脂との親和性が悪く、塩酸が樹脂の内部まで浸透しにくいため、完全に脱メタル化できず、そのため測定値にばらつきが生じたと考えられる。   The present invention is characterized in that alcoholic hydrochloric acid is used to demetalize the ionomer resin. In the above conventional method, general hydrochloric acid containing no alcohol has been used to demetalize the ionomer resin. However, general hydrochloric acid has poor affinity with the resin, and it is difficult for the hydrochloric acid to penetrate into the resin, so that it cannot be completely demetalized. Therefore, it is considered that the measured values varied.

一方、本発明においては、脱メタル処理にアルコール性塩酸を用いている。アルコール性塩酸は、一般的な塩酸より樹脂との親和性が良く、樹脂の内部まで塩酸が浸透し易いと考えられる。その結果、迅速、確実に脱メタル処理が行われるようになり、測定値のばらつきがなくなり、高精度かつ迅速な測定が達成された。   On the other hand, in the present invention, alcoholic hydrochloric acid is used for the metal removal treatment. Alcoholic hydrochloric acid has better affinity with resin than general hydrochloric acid, and hydrochloric acid is considered to easily penetrate into the resin. As a result, the metal removal process can be performed quickly and reliably, and there is no variation in measured values, and high-accuracy and quick measurement is achieved.

アルコールとしては、エタノールや2−プロパノール等の炭素数4以下のアルコール、すなわち低級アルコールを用いることが好ましい(請求項2)。低級アルコールを用いることにより、樹脂との親和性がより改善され、脱メタル処理がより確実に行われるようになる。   As the alcohol, it is preferable to use an alcohol having 4 or less carbon atoms such as ethanol or 2-propanol, that is, a lower alcohol. By using a lower alcohol, the affinity with the resin is further improved, and the demetallization process is more reliably performed.

塩酸中のアルコールの含有量は、特に限定されないが、アルコールの含有割合が大きい程、アイオノマー樹脂と塩酸との親和性が向上する。一方、アルコールの含有割合が大きすぎると、塩酸が相溶しにくくなると考えられるので、これらを考慮することが好ましい。   The alcohol content in hydrochloric acid is not particularly limited, but the greater the alcohol content, the better the affinity between the ionomer resin and hydrochloric acid. On the other hand, if the alcohol content is too high, it is considered that hydrochloric acid is difficult to be compatible.

脱メタル処理にアルコール性塩酸を用いる点以外は、本発明の測定方法は、特許文献1に記載されているような、アイオノマー樹脂の赤外吸収スペクトルを利用した従来の測定方法と同様な条件で行われる。例えば、アルコール性塩酸の塩酸濃度としては、0.1N程度が好ましい。塩酸濃度が高すぎる場合は、樹脂が酸化して正確な測定値が得られない場合があるので、高濃度の塩酸による脱メタル処理は好ましくない。   Except for using alcoholic hydrochloric acid for demetallization treatment, the measurement method of the present invention is under the same conditions as the conventional measurement method using the infrared absorption spectrum of ionomer resin as described in Patent Document 1. Done. For example, the hydrochloric acid concentration of alcoholic hydrochloric acid is preferably about 0.1N. If the hydrochloric acid concentration is too high, the resin may oxidize and an accurate measurement value may not be obtained, so demetalation treatment with high concentration hydrochloric acid is not preferable.

アイオノマー樹脂の脱メタル処理は、塩酸以外の強酸によっても可能であるが、例えば、硫酸のみからなる強酸を用いた場合には、硫酸の脱水作用により樹脂が炭化されてしまう問題があり、また硝酸のみからなる強酸を用いた場合には、樹脂が硝酸の酸化作用を受ける問題があり、硫酸や硝酸のみからなる強酸、又は硫酸や硝酸を主体とする強酸は好ましくない。   The demetallization treatment of the ionomer resin can be performed with a strong acid other than hydrochloric acid. However, for example, when a strong acid consisting only of sulfuric acid is used, there is a problem that the resin is carbonized due to the dehydrating action of sulfuric acid. In the case of using a strong acid consisting of only acid, there is a problem that the resin is subjected to the oxidizing action of nitric acid, and a strong acid consisting only of sulfuric acid or nitric acid or a strong acid mainly composed of sulfuric acid or nitric acid is not preferred.

本発明の方法により、アイオノマー樹脂の中和度を、迅速かつ正確に測定することができる。   By the method of the present invention, the degree of neutralization of the ionomer resin can be measured quickly and accurately.

次に、本発明を実施するための最良の形態について実施例を用いて説明するが、本発明の範囲は実施例の範囲に限定されるものではなく、本発明の趣旨を損なわない範囲で種々の変更をすることができる。   Next, the best mode for carrying out the present invention will be described with reference to examples. However, the scope of the present invention is not limited to the scope of the examples, and various modifications can be made without departing from the spirit of the present invention. You can make changes.

実施例1〜3
(アイオノマー樹脂試料の作成)
EMAA(エチレン−メタクリル酸共重合体、三井・デュポンケミカル社製、商品名:ニュクレルN0903HC)100重量部と、水酸化マグネシウム5重量部、老化防止剤(チバスペシャリティケミカル社製、商品名:イルガノックス1010)0.5重量部を二軸混合機にて混練りして、実施例1のアイオノマー樹脂試料(Mg系アイオノマー)を作成した。又、三井・デュポンケミカル社製の商品名ハイミラン1706(Zn系アイオノマー)、ハイミラン1707(Na系アイオノマー)を、それぞれ実施例2、実施例3のアイオノマー樹脂試料とした。
Examples 1-3
(Preparation of ionomer resin sample)
100 parts by weight of EMAA (ethylene-methacrylic acid copolymer, manufactured by Mitsui DuPont Chemical Co., Ltd., trade name: Nucrel N0903HC), 5 parts by weight of magnesium hydroxide, anti-aging agent (made by Ciba Specialty Chemicals Co., Ltd., trade name: Irganox) 1010) 0.5 part by weight was kneaded in a twin-screw mixer to prepare an ionomer resin sample (Mg ionomer) of Example 1. Moreover, the product names HiMilan 1706 (Zn ionomer) and HiMilan 1707 (Na ionomer) manufactured by Mitsui DuPont Chemical Co., Ltd. were used as the ionomer resin samples of Example 2 and Example 3, respectively.

[C/Dの測定]
(赤外吸収スペクトル測定用試料の作成)
前記のアイオノマー樹脂試料のそれぞれを凍結粉砕して約0.1g秤量し、バイアル瓶に入れる。試料を入れたバイアル瓶に、0.1Nアルコール性塩酸(試薬:関東化学社製、エタノール含有)10mlを加えて、蓋をする。その後、このバイアル瓶を振とう機にセットして、室温にて1時間振り混ぜ、脱メタル処理(亜鉛イオン等の樹脂中の金属イオンの除去)を行う。その後、試料とアルコール性塩酸を濾紙で分離し、分離した試料は、純水で十分に洗浄して、酸分を完全に除去する。洗浄後の試料を、60℃で3時間ほど真空乾燥して、赤外吸収スペクトル測定用試料を得た。
[Measurement of C / D]
(Preparation of infrared absorption spectrum measurement sample)
Each of the ionomer resin samples is freeze ground and weighed about 0.1 g and placed in a vial. To the vial containing the sample, 10 ml of 0.1N alcoholic hydrochloric acid (reagent: manufactured by Kanto Chemical Co., Inc., containing ethanol) is added and capped. Then, this vial is set on a shaker, shaken at room temperature for 1 hour, and demetallized (removal of metal ions in the resin such as zinc ions). Thereafter, the sample and the alcoholic hydrochloric acid are separated with a filter paper, and the separated sample is sufficiently washed with pure water to completely remove the acid content. The washed sample was vacuum dried at 60 ° C. for about 3 hours to obtain a sample for infrared absorption spectrum measurement.

(赤外吸収スペクトル測定)
このようにして得られた赤外吸収スペクトル測定用試料について、Magna560(Nicolet社製赤外吸収スペクトル測定装置)を用いて、以下に示す条件で、赤外吸収スペクトルを測定した。
アクセサリ:1回反射ATRアクセサリ(Dura Scope:SensIR社製)
測定法 :ATR法
分解能 :4cm−1
積算回数 :16回
(Infrared absorption spectrum measurement)
About the infrared absorption spectrum measurement sample obtained in this manner, an infrared absorption spectrum was measured using Magna 560 (an infrared absorption spectrum measurement apparatus manufactured by Nicolet) under the following conditions.
Accessories: One-time reflection ATR accessory (Dura Scope: manufactured by SensIR)
Measurement method: ATR method Resolution: 4 cm −1
Integration count: 16 times

(測定結果)
この赤外吸収スペクトル測定用試料の作成及び赤外吸収スペクトル測定を、それぞれの試料について計3回行い、各回のC/D(Cは1700cm−1のピーク高さ、Dは2915cm−1のピーク高さ)の平均値をそれぞれの試料についてのC/Dの値とした。なお、図1は、実施例1における赤外吸収スペクトルを示す。図1では、3回の測定データを縦方向に位置をずらして表示している。
(Measurement result)
The creation and the infrared absorption spectrum of the infrared absorption spectrum measurement sample, performed for each sample three times, each time the C / D (C peak of 1700 cm -1 height, D is the peak of 2915 cm -1 The average value of (height) was taken as the value of C / D for each sample. FIG. 1 shows an infrared absorption spectrum in Example 1. In FIG. 1, three times of measurement data are displayed with their positions shifted in the vertical direction.

いずれの試料のいずれの測定についても、3回とも、1585cm−1のピークは見られなかった。1585cm−1のピークは、カルボキシルイオン:−COOの吸収、即ちアイオノマーのイオン架橋形成を示すピークであり、このピークが消失したことから、いずれの場合も金属イオンが全部除去されたことが示されている。その結果C/Dのばらつきは殆ど無かった。 In any measurement of any sample, a peak of 1585 cm −1 was not observed in all three times. The peak at 1585 cm −1 is a peak indicating absorption of carboxyl ion: —COO , that is, ion bridge formation of ionomer. Since this peak disappeared, it was shown that all metal ions were removed in any case. Has been. As a result, there was almost no C / D variation.

[A/Bの測定]
実施例1、2及び3のアイオノマー樹脂試料について、0.1Nアルコール性塩酸による処理を行わない以外は、前記と同じ条件にて、赤外吸収スペクトルを測定し、A/B(Aは1700cm−1のピーク高さ、Bは2915cm−1のピーク高さ)を求めた。
[A / B measurement]
For the ionomer resin samples of Examples 1, 2 and 3, the infrared absorption spectrum was measured under the same conditions as above except that the treatment with 0.1N alcoholic hydrochloric acid was not performed, and A / B (A was 1700 cm − 1 peak height and B was 2915 cm −1 peak height).

以上のようにして求めたA/B及びC/Dと、式:100−100×(A/B)/(C/D)により中和度(%)を求めた。A、B、A/B、C、D、C/D及び中和度(%)の値を表1に示す。   The degree of neutralization (%) was determined from A / B and C / D determined as described above and the formula: 100-100 × (A / B) / (C / D). Table 1 shows values of A, B, A / B, C, D, C / D, and degree of neutralization (%).

Figure 2008298601
Figure 2008298601

比較例
実施例1と同じ試料を用い、0.1Nアルコール性塩酸の代わりに、アルコールを含有しない0.1N塩酸(試薬:関東化学社製)を用いた以外は、実施例と同条件で赤外吸収スペクトル測定用試料の作成を行い、赤外吸収スペクトルを測定した。この赤外吸収スペクトル測定用試料の作成及び赤外吸収スペクトル測定を、計3回行った。得られた赤外吸収スペクトルを図2に示す。なお、図2では、3回の測定データを縦方向に位置をずらして表示している。
Comparative Example The same sample as in Example 1 was used, except that 0.1N hydrochloric acid containing no alcohol (reagent: manufactured by Kanto Chemical Co., Inc.) was used instead of 0.1N alcoholic hydrochloric acid. A sample for measuring an external absorption spectrum was prepared, and an infrared absorption spectrum was measured. This infrared absorption spectrum measurement sample preparation and infrared absorption spectrum measurement were performed three times in total. The obtained infrared absorption spectrum is shown in FIG. In FIG. 2, three measurement data are displayed with their positions shifted in the vertical direction.

図2より明らかなように、1585cm−1のピーク(図中の矢印で示す部分。アイオノマーのイオン架橋形成を示すピーク。)が消失している場合と消失していない場合があり、脱メタル後のスペクトルに大きなばらつきがある。即ち、金属イオンの除去が充分に行われない場合があり、その結果、C/Dの値がばらつき、正確な測定値は得られない。 As is clear from FIG. 2, the peak at 1585 cm −1 (the part indicated by the arrow in the figure. The peak indicating ion bridge formation of the ionomer) may or may not have disappeared. There is a large variation in the spectrum. That is, metal ions may not be sufficiently removed. As a result, C / D values vary, and accurate measurement values cannot be obtained.

なお、以下の表2に塩酸の液性の種類とアイオノマー樹脂との親和性(親和性良を○、親和性低を×で表す。)、及び測定の精度(○:精度高、×:精度低)の関係を示す。   Table 2 below shows the liquid type of hydrochloric acid and the affinity of the ionomer resin (good affinity is indicated by ○, low affinity is indicated by ×), and measurement accuracy (○: high accuracy, ×: accuracy) Low).

Figure 2008298601
Figure 2008298601

実施例1で得られた赤外吸収スペクトルである。2 is an infrared absorption spectrum obtained in Example 1. 比較例で得られた赤外吸収スペクトルである。It is an infrared absorption spectrum obtained in a comparative example.

Claims (2)

アイオノマー樹脂の試料の赤外吸収スペクトルを測定し、その1700cm−1のピーク高さA及び2915cm−1のピーク高さBを求めると共に、
前記アイオノマー樹脂の試料を、アルコールを含有する塩酸と接触させて、前記アイオノマー樹脂中の金属イオンを除去した後に赤外吸収スペクトルを測定し、その1700cm−1のピーク高さC及び2915cm−1のピーク高さDを求め、
式:100−100×(A/B)/(C/D)による計算値を中和度(%)とすることを特徴とする、アイオノマー樹脂の中和度測定方法。
Measuring the infrared absorption spectrum of a sample of the ionomer resins, together with obtaining the peak height B of the peak height A and 2915 cm -1 of the 1700 cm -1,
The sample of the ionomer resin was brought into contact with hydrochloric acid containing alcohol to remove metal ions in the ionomer resin, and an infrared absorption spectrum was measured. The peak height C of 1700 cm −1 and 2915 cm −1 were measured. Find the peak height D,
A method for measuring the degree of neutralization of an ionomer resin, characterized in that the calculated value according to the formula: 100-100 × (A / B) / (C / D) is defined as the degree of neutralization (%).
アルコールが炭素数4以下の低級アルコールであることを特徴とする請求項1に記載のアイオノマー樹脂の中和度測定方法。   The method for measuring the degree of neutralization of an ionomer resin according to claim 1, wherein the alcohol is a lower alcohol having 4 or less carbon atoms.
JP2007145372A 2007-05-31 2007-05-31 Method for measuring neutralization degree of ionomer resin Pending JP2008298601A (en)

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JPH1034800A (en) * 1996-07-19 1998-02-10 Kureha Chem Ind Co Ltd Thermoplastic multi-layer film
JPH11207886A (en) * 1998-01-29 1999-08-03 Kureha Chem Ind Co Ltd Thermoplastic multilayer film
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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