JP2023132657A - 赤外線放射樹脂組成物 - Google Patents
赤外線放射樹脂組成物 Download PDFInfo
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- titanium dioxide
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Abstract
Description
赤外線放射材料は、二酸化チタンと、焼成ハイドロタルサイト類化合物と、ナノサイズダイヤモンドと、を含み、
赤外線放射材料において、二酸化チタンと、焼成ハイドロタルサイト類化合物との質量比が60:40~90:10であり、ナノサイズダイヤモンドの含有量が、二酸化チタンと焼成ハイドロタルサイト類化合物との合計100質量部に対して0.01質量部以上0.5質量部以下である赤外線放射樹脂組成物である。
1.赤外線放射樹脂組成物
1.1.赤外線放射材料
1.2.二酸化チタン
1.3.焼成ハイドロタルサイト類化合物
1.4.ナノサイズダイヤモンド
2.赤外線放射樹脂組成物の製造方法
本実施形態に係る赤外線放射樹脂組成物は、赤外線放射材料と樹脂とを有している。赤外線放射材料は粉末状であることが好ましく、赤外線放射樹脂組成物において、赤外線放射材料粉末が樹脂中に分散していることが好ましい。赤外線放射材料については後述する。
赤外線放射材料は、遠赤外線を放射する材料である。本実施形態では、特に、物質、人体、動植物等に含まれる水分子を励起するのに適した波長を有する遠赤外線を放射する材料であることが好ましい。また、当該赤外線放射材料は、波長が5μmから20μmの範囲、特に好ましくは、7μmから14μmの範囲内において遠赤外線放射率が高い材料であることが好ましい。遠赤外線放射率は、フーリエ変換赤外分光光度計(Fourier Transform Infrared Spectroscopy:FTIR)を用いて、たとえば、遠赤外線協会が認定する測定方法に基づき測定することができる。
二酸化チタンは、結晶構造の違いにより、アナタース型(正方晶)、ルチル型(正方晶)、ブルッカイト型(斜方晶)が存在する。本実施形態では、二酸化チタンの結晶構造は特に制限されないが、工業原料としての入手性の観点から、アナタース型またはルチル型であることが好ましい。また、二酸化チタンを工業的に製造する方法としては、塩素法および硫酸法が知られているが、本実施形態では、二酸化チタンの製造方法は特に制限されない。
ハイドロタルサイト類化合物は、化学式Mg1-xAlx(OH)2(CO3)x/2・mH2Oで表される層状の無機化合物である。化学式から明らかなように、ハイドロタルサイト類化合物は結晶水を含んでおり、層間に存在している。ハイドロタルサイト類化合物を加熱すると、約180~230℃付近で結晶水の脱離が生じる。
なお、二酸化チタン粉末の平均粒子径と、焼成ハイドロタルサイト類化合物粉末の平均粒子径とは同程度であることが好ましい。
ナノサイズダイヤモンドは、微細な粒子状ダイヤモンドであり、ダイヤモンド構造を有するコアの表層が、アモルファス炭素、グラフェン、グラファイト等の炭素層で被覆されている。ナノサイズダイヤモンドは、赤外線により励起され、波長が1~10μm程度の赤外線を放射する。励起されるキャリア数が酸化物に比べて多いので、ナノサイズダイヤモンドの含有量が上記の範囲内であっても、十分に遠赤外線放射効率を高くすることができる。
本実施形態に係る赤外線放射樹脂組成物は、樹脂と赤外線放射材料とを混合することにより混合物として得られる。混合物中では、赤外線放射材料が樹脂中に分散していることが好ましい。
赤外線放射材料の原料として、二酸化チタン粉末(富士チタン社製「TA301」)と、焼成ハイドロタルサイト類化合物粉末(堺化学工業社製「HT-9」)と、ナノサイズダイヤモンド粉末(ナノ炭素研究所社製「NanoAmando」)とを準備した。二酸化チタン粉末の平均粒子径D50は580nmであり、焼成ハイドロタルサイト類化合物粉末の平均粒子径D50は500nmであり、ナノサイズダイヤモンドの二次粒子の平均粒子径は50nmであった。
赤外線放射材料の原料として、二酸化チタン粉末(石原産業社製「CR-60」)と、焼成ハイドロタルサイト類化合物粉末(堺化学工業社製「HT-9」)と、ナノサイズダイヤモンド粉末(ナノ炭素研究所社製「NanoAmando」)とを準備した。二酸化チタン粉末の平均粒子径D50は210nmであり、焼成ハイドロタルサイト類化合物粉末の平均粒子径D50は500nmであり、ナノサイズダイヤモンドの二次粒子の平均粒子径D50は50nmであった。
赤外線放射材料の原料として、二酸化チタン粉末(石原産業社製「A-100」)と、焼成ハイドロタルサイト類化合物粉末(協和化学工業社製「DHT-4A-2」)と、ナノサイズダイヤモンド粉末(ダイヤマテリアル社製「SCMナノダイヤ」)とを準備した。二酸化チタン粉末の平均粒子径D50は100nmであり、焼成ハイドロタルサイト類化合物粉末の平均粒子径D50は400nmであり、ナノサイズダイヤモンドの二次粒子の平均粒子径D50は50~100nmであった。
実施例3A-3の赤外線放射材料と、PET樹脂との質量比が1:9となるように配合して、樹脂溶解混練装置(東洋精機所社製「50C型150」)を用いて、加熱温度:280℃、回転数:100rpmの条件で混練を行い、マスターバッチ3MA-1を作製した。
Claims (5)
- 赤外線放射材料と樹脂とを含む赤外線放射樹脂組成物であって、
前記赤外線放射材料は、二酸化チタンと、焼成ハイドロタルサイト類化合物と、ナノサイズダイヤモンドと、を含み、
前記赤外線放射材料において、前記二酸化チタンと、前記焼成ハイドロタルサイト類化合物との質量比が60:40~90:10であり、前記ナノサイズダイヤモンドの含有量が、前記二酸化チタンと前記焼成ハイドロタルサイト類化合物との合計100質量部に対して0.01質量部以上0.5質量部以下である赤外線放射樹脂組成物。 - 前記赤外線放射樹脂組成物は、前記赤外線放射材料が樹脂中に分散した板状、筒状、シート状、または、繊維状である請求項1に記載の赤外線放射樹脂組成物。
- 前記二酸化チタンの平均粒子径が10nm以上1000nm以下である請求項1または2に記載の赤外線放射樹脂組成物。
- 前記焼成ハイドロタルサイト類化合物の平均粒子径が10nm以上1000nm以下である請求項1から3のいずれかに記載の赤外線放射樹脂組成物。
- 前記ナノサイズダイヤモンドの二次粒子の平均粒子径が5nm以上200nm以下である請求項1から4のいずれかに記載の赤外線放射樹脂組成物。
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