TW201836836A - 異向發熱性片、層合玻璃用中間膜及層合玻璃 - Google Patents
異向發熱性片、層合玻璃用中間膜及層合玻璃 Download PDFInfo
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- TW201836836A TW201836836A TW107106270A TW107106270A TW201836836A TW 201836836 A TW201836836 A TW 201836836A TW 107106270 A TW107106270 A TW 107106270A TW 107106270 A TW107106270 A TW 107106270A TW 201836836 A TW201836836 A TW 201836836A
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- Prior art keywords
- aerogel
- layer
- laminated glass
- anisotropic
- heat
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Classifications
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Abstract
本發明之目的在於提供一種可將所產生之熱沿特定方向釋出而高效率地利用其能量且操作性亦優異之異向發熱性片、使用該異向發熱性片之層合玻璃用中間膜及層合玻璃。
本發明之異向發熱性片具有含有氣凝膠之氣凝膠層與發熱層的積層體,且依據JIS C 2151進行拉伸試驗時所獲得之上述氣凝膠層之拉伸破壞應變為0.1%以上。
Description
本發明係關於一種可將所產生之熱沿特定方向釋出而高效率地利用其能量且操作性亦優異之異向發熱性片、使用該異向發熱性片之層合玻璃用中間膜及層合玻璃。
層合玻璃即便受到外部衝擊而破損,玻璃碎片之飛散量亦較少而安全性優異。因此,廣泛用於汽車及建築物等。
近年來,對層合玻璃要求之性能亦多樣化,且正在研究藉由對層合玻璃本身進行加熱而使凍結之窗玻璃暖化從而使霜或冰融化之技術。
作為對層合玻璃本身進行加熱之一方法,業界正在研究於層合玻璃之玻璃面形成導電膜並藉由源自通電時之電阻之發熱使層合玻璃暖化之方法。此種形成有導電膜之層合玻璃例如揭示於專利文獻1等中。
另一方面,作為對層合玻璃本身進行加熱之一方法,亦正在研究於層合玻璃用中間膜積層由導電膜構成之發熱層之方法。此種層合玻璃用中間膜通常係藉由在發熱層上積層含有聚乙烯縮醛等熱塑性樹脂之樹脂層之方法而製造。
然而,即便使用此種可發熱之層合玻璃使凍結之窗玻璃暖化而使霜或冰融化,於霜或冰實際融化之前亦需要一定以上之時間,因此,要求於更短之時間內高效率地使霜或冰融化。
[先前技術文獻]
[專利文獻]
專利文獻1:日本特開2008-222513號公報
本發明者等人對即便使用可發熱之層合玻璃,亦無法高效率地於短時間內使凍結之窗玻璃暖化而使霜或冰融化之原因進行了研究。結果發現,由層合玻璃產生之熱被釋出至層合玻璃之兩面側而未被高效率地利用。即,於汽車及建築物等,霜或冰附著於外側,但於自層合玻璃產生熱時,其能量之大致一半被釋出至外側而用於使霜或冰融化,另一方面,剩餘之大致一半被釋出至內側而無法使霜或冰融化。
本發明者鑒於上述現狀,目的在於提供一種可將所產生之熱沿特定方向釋出而高效率地利用其能量且操作性亦優異之異向發熱性片、使用該異向發熱性片之層合玻璃用中間膜及層合玻璃。
本發明之異向發熱性片具有含有氣凝膠之氣凝膠層與發熱層的積層體,且依據JIS C 2151進行拉伸試驗時所獲得之上述氣凝膠層之拉伸破壞應變為0.1%以上。
以下,對本發明進行詳細說明。
氣凝膠係藉由超臨界乾燥或蒸發乾燥、冷凍乾燥等將凝膠中所包含之溶劑置換成氣體之多孔性物質,除二氧化矽(silica)氣凝膠以外,近年來,亦已知有碳氣凝膠或聚合物氣凝膠等多種。本發明者等人進行了努力研究,結果發現,藉由在含有氣凝膠之氣凝膠層積層發熱層,可製成能夠將所產生之熱沿特定方向釋出而高效率地利用其能量之異向發熱性片。尤其是於將該 異向發熱性片作為層合玻璃用中間膜製造層合玻璃之情形時,可發揮極高之異向發熱性。認為其原因在於:於將本發明之異向發熱性片作為層合玻璃用中間膜製造層合玻璃時,於高壓釜之步驟中成為高溫高壓之狀態,藉此可使氣凝膠中之溶劑較通常進一步蒸發,從而成為孔隙更多之氣凝膠。進而,認為原因在於:藉由進行層合玻璃化,氣凝膠變得不易吸濕而可保持孔隙更多之狀態,從而使熱特別不易通過而絕熱性提高。再者,於利用氣凝膠單體製成與高壓釜相同之高溫高壓狀態之情形時,因氣凝膠較輕而不易將氣凝膠靜置,故進行與層合玻璃製造時相同之處理非常困難。
然而,為了將上述異向發熱性片用作層合玻璃用中間膜,耐衝擊性或操作性等亦重要。大部分氣凝膠之耐衝擊性較低且脆弱,因此,存在亦無法配合曲面進行彎曲加工或為了提高操作性而卷取成輥狀之新問題。因此,本發明者等人進而進行努力研究,結果發現,藉由選擇氣凝膠中柔軟性尤其高之氣凝膠而提高整體之柔軟性,可發揮較高之異向發熱性並且賦予亦可用作層合玻璃用中間膜之耐衝擊性或操作性,從而完成了本發明。
本發明之異向發熱性片具有氣凝膠層與發熱層的積層體。上述氣凝膠層藉由含有氣凝膠而可發揮較高之絕熱性。藉此,發熱層所產生之熱受到氣凝膠層阻礙而不易釋出至氣凝膠層側,而是被釋出至與氣凝膠層相反之側,從而可發揮較高之異向發熱性。尤其是將本發明之異向發熱性片用作層合玻璃用中間膜製造層合玻璃時,可發揮更高之異向發熱性。
上述氣凝膠意指藉由超臨界乾燥、蒸發乾燥、冷凍乾燥等將凝膠中所包含之溶劑置換成氣體而得之多孔性物質。
作為上述氣凝膠,並無特別限定,例如可使用聚合物氣凝膠、二氧化矽氣凝膠、碳氣凝膠、氧化鋁氣凝膠、有機無機混合氣凝膠等先前公知之氣凝膠。其中,就具有較高之柔軟性而可達成下述拉伸破壞應變之方面而言,聚合物氣 凝膠較合適。
上述聚合物氣凝膠係藉由在製備包含有機高分子材料之凝膠後,藉由超臨界乾燥或蒸發乾燥、冷凍乾燥等將溶劑去除之方法而製造之氣凝膠。
作為構成上述聚合物氣凝膠之有機高分子材料,並無特別限定。就獲得顯示尤其高之柔軟性之氣凝膠之方面而言,選自由間苯二酚-福馬林樹脂、纖維素奈米纖維、聚醯亞胺、聚胺酯(polyurethane)、環氧樹脂、聚丙烯酸酯、丙烯酸酯低聚物、聚甲基丙烯酸甲酯、聚氧伸烷基、聚丁二烯、聚醚及聚葡萄胺糖所組成之群中之至少1種有機高分子材料較適合。
上述有機無機混合氣凝膠係由有機物與無機物構成之氣凝膠。
上述二氧化矽氣凝膠或氧化鋁氣凝膠雖被分類為無機氣凝膠,但亦存在被分類為有機無機混合氣凝膠者。例如,作為無機氣凝膠之二氧化矽氣凝膠於2個Si之間不包含有機基。相對於此,作為有機無機混合氣凝膠之二氧化矽氣凝膠於2個Si之間包含有機基。就獲得顯示較高之柔軟性之氣凝膠之觀點而言,作為有機無機混合氣凝膠之二氧化矽氣凝膠較合適。再者,可藉由進行例如NMR解析確認為何種二氧化矽氣凝膠。
上述氣凝膠層除含有上述氣凝膠以外,亦可含有抗氧化劑、紫外線吸收劑、光穩定劑、難燃劑、染料、顏料、塑化劑、抗靜電劑、無機粒子、螢光劑、熱線吸收劑、熱線反射劑、作為接著力調整劑之改質聚矽氧油、耐濕劑、抗黏連劑等添加劑。又,上述氣凝膠層亦可被熱硬化性材料塗佈。
但是,就將異向發熱性及透明性進一步提高之方面而言,上述氣凝膠層較佳為僅由氣凝膠構成或氣凝膠之含量為80重量%以上。
上述氣凝膠層之厚度並無特別限定,較佳之下限為10μm,較佳之上限為30mm。若上述氣凝膠層之厚度為10μm以上,則不僅可賦予較高之異 向發熱性,亦可發揮較高之絕熱性。又,若上述氣凝膠層之厚度為30mm以下,則配合曲面之彎曲加工或卷取成輥狀之情形時之操作性提高。上述氣凝膠層之厚度之更佳之下限為50μm,更佳之上限為15mm,進而較佳之下限為90μm,進而較佳之上限為3mm,尤佳之上限為1.5mm,最佳之上限為800μm。
尤其是若氣凝膠層之厚度為3mm以下,則不僅是操作性提高,氣凝膠之抗斷裂之效果亦進一步提高,並且可進一步抑制氣凝膠層產生褶皺或彎曲痕。隨著氣凝膠層之厚度成為2.0mm以下、1.5mm以下、800μm以下、500μm以下,氣凝膠之抗斷裂效果及褶皺或彎曲痕產生之防止效果提高。
上述發熱層具有藉由施加電壓而發熱,從而使凍結之玻璃暖化或使霜或冰融化之作用。
上述發熱層之表面電阻率較佳為10Ω/□以下。表面電阻率為10Ω/□以下之發熱層可藉由施加電壓而充分地發熱,從而使凍結之玻璃暖化而使霜或冰融化。更佳為5.0Ω/□以下,進而較佳為3.5Ω/□以下,尤佳為2.5Ω/□以下。
上述發熱層係由包含金、銀、銅、鉑等電阻率較低之金屬之單層或複數層構成。藉由包含該等電阻率較低之金屬,於施加電壓時可獲得充分之發熱。
於本說明書中,所謂電阻率較低之金屬,意指電阻率為1×10-6Ωm以下之金屬或合金。此處,作為電阻率為1×10-7Ωm以上且未達1×10-6Ωm之金屬或合金,例如可列舉鉑、鐵、錫、鉻、鉛、鈦、水銀、不鏽鋼等。又,作為電阻率未達1×10-7Ωm之金屬或合金,例如可列舉金、銀、銅、鋁、鎂、鎢、鈷、鋅、鎳、鉀、鋰、黃銅等。
上述發熱層之厚度並無特別限定,較佳為10nm以上。藉由將上述發熱層之厚度設為10nm以上,可藉由對發熱層施加電壓而充分地發熱,從 而使凍結之玻璃暖化或使霜或冰融化。上述發熱層之厚度較佳為15nm以上,更佳為20nm以上。
上述發熱層之厚度之上限並無特別限定,實質而言上限為1000nm左右。
上述發熱層亦可於至少一表面積層透明導電層或金屬氧化物層。藉由使用該等透明導電層或金屬氧化物層,可提高所獲得之異向發熱性片之透明性。
作為上述透明導電層,例如就透明性及電阻率較低之方面而言,較佳為由摻雜有錫之氧化銦(ITO)、摻雜有氟之氧化錫(FTO)、摻雜有銻之氧化錫(ATO)等構成者。
作為上述金屬氧化物層,例如可列舉由氧化鈦(TiO2)、氧化鈮(Nb2O5)、氧化矽(SiO2)等構成者。該等透明導電層或金屬氧化物層可單獨使用,亦可將2種以上併用。其中,由ITO或ATO構成之透明導電層或由選自由氧化鈦、氧化鈮所組成之群中之至少1種構成之金屬氧化物層較合適。
上述透明導電層或金屬氧化物層之厚度並無特別限定,較佳之下限為20nm,較佳之上限為300nm。上述透明導電層或金屬氧化物層之厚度之更佳之下限為25nm,更佳之上限為100nm。
上述發熱層可直接形成於上述氣凝膠層上,亦可形成於基材上後積層於上述氣凝膠層。
於本發明之異向發熱性片具有基材之情形時,上述基材依據JIS C 2151所測得之於150℃進行30分鐘熱處理後之熱收縮率於MD、TD方向上均較佳為1.0~3.5%。藉由使用具有此種熱收縮率之基材,可藉由濺鍍製程等形成均勻之發熱層,並且於製造層合玻璃時可防止因熱收縮率之差異而導致發熱層與下述樹脂層產生偏差,從而可提高上述發熱層與樹脂層之接著性。上述熱收縮率之更佳之下限為1.5%,更佳之上限為3.0%。
再者,於本說明書中,所謂MD方向(Machine Direction),係指將基材擠出加工成片狀時之擠出方向,所謂TD方向(Transverse Direction),係指相對於MD方向垂直之方向。
又,上述熱收縮率相當於JIS C 2151:2006之「21.尺寸變化」之項目之尺寸變化率。
上述基材之楊氏模數較佳為1MPa以上。藉由使用楊氏模數為1MPa以上之基材,可進一步提高與上述樹脂層之接著性。上述基材之楊氏模數更佳為10MPa以上,進而較佳為20MPa以上。上述基材之楊氏模數之較佳之上限為10GPa。
再者,楊氏模數係藉由依據JIS K7127之拉伸試驗於23℃獲得應變-應力曲線,並由該應變-應力曲線之直線部分之斜率表示。
再者,下述樹脂層之楊氏模數通常較佳為未達1GPa。
上述基材較佳為含有熱塑性樹脂。
作為上述基材中所包含之熱塑性樹脂,可列舉:聚乙烯、聚丙烯、聚(4-甲基-1-戊烯)、聚縮醛等鏈狀聚烯烴,或降莰烯類之開環複分解聚合物或加成聚合物、降莰烯類與其他烯烴類之加成共聚物等脂環族聚烯烴。又,可列舉:聚乳酸、聚丁二酸丁酯等生物降解性聚合物。又,可列舉:尼龍6、尼龍11、尼龍12、尼龍66等聚醯胺或聚芳醯胺。又,可列舉:聚甲基丙烯酸甲酯、聚氯乙烯、聚偏二氯乙烯、聚苯乙烯、苯乙烯共聚合聚甲基丙烯酸甲酯、聚碳酸酯、聚對苯二甲酸丙二酯、聚對苯二甲酸乙二酯、聚萘二甲酸乙二酯、聚對苯二甲酸丁二酯、聚2,6-萘二甲酸乙二酯等聚酯。又,可列舉:聚醚碸或聚醚醚酮、或改質聚苯醚、或聚苯硫醚、或聚醚醯亞胺、或聚醯亞胺、或聚芳酯。進而,可列舉:四氟乙烯樹脂、或三氟乙烯樹脂、或三氟氯乙烯樹脂、或四氟乙烯六氟丙烯共聚物、或聚偏二氟乙烯等。該等熱塑性樹脂可單獨使用或 將2種以上併用,且以上述熱收縮率或楊氏模數成為所需範圍內之方式進行調整。
上述基材亦可視需要含有紫外線屏蔽劑或抗氧化劑等先前公知之添加劑。
作為上述紫外線屏蔽劑,例如可使用包含金屬之紫外線屏蔽劑、包含金屬氧化物之紫外線屏蔽劑等先前公知之紫外線屏蔽劑。又,可列舉:具有苯并三唑結構之紫外線屏蔽劑、具有二苯甲酮結構之紫外線屏蔽劑、具有三結構之紫外線屏蔽劑、具有丙二酸酯結構之紫外線屏蔽劑、具有草醯苯胺結構之紫外線屏蔽劑、具有苯甲酸酯結構之紫外線屏蔽劑等。
作為上述抗氧化劑,例如可使用具有酚結構之抗氧化劑、包含硫之抗氧化劑、包含磷之抗氧化劑等先前公知之抗氧化劑。
上述基材之厚度並無特別限定,較佳之下限為10μm,較佳之上限為500μm。若上述基材之厚度為該範圍內,則可使用濺鍍製程等形成均勻之發熱層,且可於製造層合玻璃時防止發熱層與樹脂層之表面產生偏差,從而可進一步提高上述發熱層與樹脂層之接著性。上述基材之厚度之更佳之下限為20μm,更佳之上限為300μm。
於上述氣凝膠層或基材上形成發熱層之方法並無特別限定,例如可使用濺鍍製程、離子鍍、電漿CVD製程、蒸鍍製程、塗佈製程、浸漬製程等先前公知之方法。其中,就可形成均勻之發熱層之方面而言,濺鍍製程較合適。
於在基材上形成上述發熱層之情形時,該基材直接相接之樹脂層之依據JIS C 2151所測得之於150℃進行30分鐘熱處理後之熱收縮率與上述基材之依據JIS C 2151所測得之於150℃進行30分鐘熱處理後之熱收縮率之差之絕對值較佳為於MD、TD方向上均為10%以下。藉由將直接相接之樹脂層與基材 之熱收縮率之差之絕對值設為10%以下,可於製造層合玻璃時防止樹脂層與發熱層之間產生偏差,從而可進一步提高上述發熱層與樹脂層之接著性。上述樹脂層與上述基材之熱收縮率之差之絕對值更佳為8%以下。
再者,樹脂層之熱收縮率除可根據構成樹脂層之熱塑性樹脂之種類、塑化劑之種類或摻合量進行調整,亦可根據退火處理之條件進行調整。
本發明之層合玻璃用中間膜亦可於上述積層體之一面或兩面具有含有熱塑性樹脂之樹脂層(以下,亦將於兩面具有樹脂層之情形時之其中一樹脂層稱為「第1樹脂層」,將另一樹脂層稱為「第2樹脂層」)。藉由具有上述樹脂層,例如於用作層合玻璃用中間膜時,可提高與玻璃之接著性,而發揮耐貫通性等層合玻璃用中間膜所要求之基本性能。
再者,上述第1樹脂層與第2樹脂層可種類相同,亦可不同。
就提高所獲得之異向發熱性片之透明性之方面而言,上述樹脂層較佳為並非為發泡體或多孔質體。換言之,上述樹脂層較佳為非發泡體或非多孔質體。
作為上述樹脂層中所含有之熱塑性樹脂,例如可列舉:聚偏二氟乙烯、聚四氟乙烯、偏二氟乙烯-六氟丙烯共聚物、聚三氟乙烯、丙烯腈-丁二烯-苯乙烯共聚物等。又,可列舉:聚酯、聚醚、聚醯胺、聚碳酸酯、聚丙烯酸酯、聚甲基丙烯酸酯等。又,可列舉:聚氯乙烯、聚乙烯、聚丙烯、聚苯乙烯、聚乙烯縮醛、乙烯-乙酸乙烯酯共聚物、聚甲醛(或聚縮醛)樹脂、乙醯縮醛樹脂、聚乙烯基苄基縮醛樹脂、聚乙烯基異丙苯基縮醛樹脂、離子聚合物樹脂、環烯烴等。其中,上述樹脂層較佳為含有聚乙烯縮醛或乙烯-乙酸乙烯酯共聚物,更佳為含有聚乙烯縮醛。
上述聚乙烯縮醛只要為利用醛來縮醛化聚乙烯醇而獲得之聚乙烯縮醛,則並無特別限定,聚乙烯醇縮丁醛較合適。又,亦可視需要將2種以 上之聚乙烯縮醛併用。
上述聚乙烯縮醛之縮醛化度之較佳之下限為40莫耳%,較佳之上限為85莫耳%,更佳之下限為60莫耳%,更佳之上限為75莫耳%。
上述聚乙烯縮醛之羥基量之較佳之下限為15莫耳%,較佳之上限為40莫耳%。若羥基量為15莫耳%以上,則層合玻璃用中間膜與玻璃之接著性提高。若羥基量為40莫耳%以下,則層合玻璃用中間膜之操作變得容易。
再者,上述縮醛化度及羥基量例如可依據JIS K6728「聚乙烯醇縮丁醛試驗方法」進行測定。
上述聚乙烯縮醛可藉由利用醛來縮醛化聚乙烯醇而製備。
上述聚乙烯醇通常係藉由使聚乙酸乙烯酯皂化而獲得,通常使用皂化度為70~99.9莫耳%之聚乙烯醇。上述聚乙烯醇之皂化度較佳為80~99.9莫耳%。
上述聚乙烯醇之聚合度之較佳之下限為500,較佳之上限為4000。若上述聚乙烯醇之聚合度為500以上,則所獲得之層合玻璃之耐貫通性提高。若上述聚乙烯醇之聚合度為4000以下,則層合玻璃用中間膜之成形變得容易。上述聚乙烯醇之聚合度之更佳之下限為1000,更佳之上限為3600。
上述醛並無特別限定,通常可適當使用碳數為1~10之醛。上述碳數為1~10之醛並無特別限定,例如可列舉:正丁醛、異丁醛。又,例如可列舉:正戊醛、2-乙基丁醛、正己醛、正辛醛、正壬醛、正癸醛、甲醛、乙醛、苯甲醛、聚乙烯基苄醛、聚乙烯基異丙苯基醛等。其中,較佳為正丁醛、正己醛、正戊醛,更佳為正丁醛。該等醛可單獨使用,亦可將2種以上併用。
上述樹脂層較佳為含有塑化劑。上述塑化劑並無特別限定,例如可列舉:一元性有機酸酯、多元性有機酸酯等有機酯塑化劑、有機磷酸塑化劑、有機亞磷酸塑化劑等磷酸塑化劑等。上述塑化劑較佳為液狀塑化劑。
上述一元性有機酸酯並無特別限定,例如可列舉藉由二醇與一 元性有機酸之反應而獲得之二醇酯等。
作為上述醇,可列舉:三乙二醇、四乙二醇、三丙二醇等。又,作為上述一元性有機酸,可列舉:丁酸、異丁酸、己酸、2-乙基丁酸、庚酸、正辛酸、2-乙基己酸、壬酸(正壬酸)、癸酸等。
其中,三乙二醇二己酸酯、三乙二醇二-2-乙基丁酸酯、三乙二醇二正辛酸酯、三乙二醇二-2-乙基己酸酯等較合適。
上述多元性有機酸酯並無特別限定,例如可列舉:己二酸、癸二酸、壬二酸等多元性有機酸與具有碳數4~8之直鏈或支鏈結構之二醇之酯化合物。其中,二丁基癸二酸酯、二辛基壬二酸酯、二丁基卡必醇己二酸酯等較合適。
上述有機酯塑化劑並無特別限定,可列舉:三乙二醇二-2-乙基丁酸酯、三乙二醇二-2-乙基己酸酯、三乙二醇二辛酸酯、三乙二醇二正辛酸酯、三乙二醇二正庚酸酯。又,可列舉:四乙二醇二正庚酸酯、四乙二醇二-2-乙基己酸酯、癸二酸二丁酯、壬二酸二辛酯、二丁基卡必醇己二酸酯、乙二醇二-2-乙基丁酸酯、1,3-丙二醇二-2-乙基丁酸酯。又,可列舉:1,4-丁二醇二-2-乙基丁酸酯、二乙二醇二-2-乙基丁酸酯、二乙二醇二-2-乙基己酸酯、二丙二醇二-2-乙基丁酸酯。又,可列舉:三乙二醇二-2-乙基戊酸酯、四乙二醇二-2-乙基丁酸酯、二乙二醇二癸酸酯。又,可列舉:己二酸二己酯、己二酸二辛酯、己二酸己基環己酯、己二酸二異壬酯、己二酸庚基壬酯、癸二酸二丁酯、油改質癸二酸醇酸。進而,可列舉:磷酸酯與己二酸酯之混合物、由己二酸酯、碳數4~9之烷基醇及碳數4~9之環狀醇製作之混合型己二酸酯、己二酸己酯等碳數6~8之己二酸酯等。
上述有機磷酸塑化劑並無特別限定,例如可列舉:磷酸三丁氧基乙基酯、磷酸異癸酯苯酯、磷酸三異丙酯等。
進而,作為上述塑化劑,為了不易產生水解,較佳為含有三乙二醇二-2-乙基己酸酯(3GO)、三乙二醇二-2-乙基丁酸酯(3GH)、四乙二醇二-2-乙基己酸酯(4GO)、己二酸二己酯(DHA)。更佳為含有四乙二醇二-2-乙基己酸酯(4GO)、三乙二醇二-2-乙基己酸酯(3GO)。進而較佳為含有三乙二醇二-2-乙基己酸酯。
上述樹脂層中之上述塑化劑之含量並無特別限定,相對於上述聚乙烯縮醛100重量份之較佳之下限為10重量份,較佳之上限為90重量份。若上述塑化劑之含量為10重量份以上,則層合玻璃用中間膜之熔融黏度降低,將其作為層合玻璃用中間膜製造層合玻璃時之脫氣性提高。若上述塑化劑之含量為90重量份以下,則層合玻璃用中間膜之透明性提高。上述塑化劑之含量之更佳之下限為25重量份,更佳之上限為80重量份,進而較佳之上限為70重量份。
再者,若將上述塑化劑之含量設為55重量份以上,則可對該樹脂層賦予優異之遮音性。
關於上述塑化劑之含量,第1樹脂層與第2樹脂層可相同,亦可不同。
上述樹脂層較佳為含有接著力調整劑。藉由含有接著力調整劑,可調整對玻璃之接著力而獲得耐貫通性優異之層合玻璃。
作為上述接著力調整劑,例如可適當使用選自由鹼金屬鹽、鹼土金屬鹽及鎂鹽所組成之群中之至少1種。作為上述接著力調整劑,例如可列舉鉀、鈉、鎂等之鹽。
作為構成上述鹽之酸,例如可列舉:辛酸、己酸、2-乙基丁酸、丁酸、乙酸、甲酸等羧酸之有機酸、或鹽酸、硝酸等無機酸。
於對本發明之異向發熱性片要求熱線吸收性之情形時,上述樹脂層亦可含有熱線吸收劑。
上述熱線吸收劑只要具有屏蔽紅外線之性能,則並無特別限定。具體而 言,例如選自由摻雜有錫之氧化銦(ITO)粒子、摻雜有銻之氧化錫(ATO)粒子、摻雜有鋁之氧化鋅(AZO)粒子、摻雜有銦之氧化鋅(IZO)粒子、摻雜有錫之氧化鋅粒子、摻雜有矽之氧化鋅粒子、六硼化鑭粒子及六硼化鈰粒子所組成之群中之至少1種較合適。
上述樹脂層亦可視需要含有紫外線屏蔽劑、抗氧化劑、光穩定劑、作為接著力調整劑之改質聚矽氧油、難燃劑、抗靜電劑、耐濕劑、熱線反射劑、熱線吸收劑、抗黏連劑、由顏料或染料構成之著色劑等先前公知之添加劑。
上述樹脂層之厚度並無特別限定,較佳之下限為10μm,較佳之上限為3500μm。若上述樹脂層之厚度為該範圍內,則可獲得充分之耐久性,又,可滿足所獲得之層合玻璃之透明性、耐貫通性等基本品質。上述樹脂層之厚度之更佳之下限為100μm,更佳之上限為1200μm,進而較佳之下限為200μm,進而較佳之上限為850μm,尤佳之下限為350μm。
本發明之異向發熱性片依據JIS C 2151進行拉伸試驗時所獲得之氣凝膠層之拉伸破壞應變為0.1%以上。藉由使上述拉伸破壞應變為0.1%以上,本發明之異向發熱性片之柔軟性或耐衝擊性變得優異,可配合曲面進行彎曲加工或為了提高操作性而卷取成輥狀。上述拉伸破壞應變較佳為0.2%以上,更佳為0.3%以上,進而較佳為0.5%以上,尤佳為1.0%以上。
再者,上述氣凝膠層之拉伸破壞應變較佳為於23℃及濕度30%之條件進行測定。又,於在上述拉伸試驗中氣凝膠層降伏之情形時,較佳為測定拉伸破壞標稱變形。
再者,JIS C 2151引用JIS K7127,且於拉伸特性之項目中存在旨在「拉伸特性基於JIS K7127」之記載,因此亦可依據JIS K7127測定拉伸破壞應變。
將本發明之異向發熱性片卷取成輥狀之輥狀體亦為本發明之 一。
再者,將上述拉伸破壞應變設為0.1%以上之方法並無特別限定,例如可列舉採用柔軟性優異之聚合物氣凝膠作為上述氣凝膠層中所包含之氣凝膠之方法等。
製造本發明之異向發熱性片之方法並無特別限定,例如,將藉由濺鍍法等方法於上述氣凝膠層上形成上述發熱層而成之積層體夾持於上述第1樹脂層與第2樹脂層之間,並對其進行熱壓接之方法較合適。其中,將各層自經卷繞之輥狀體卷出並積層,使所獲得之積層體通過經加熱之加壓輥間進行熱壓接而獲得異向發熱性片後,將所獲得之異向發熱性片卷取成輥狀之所謂之輥對輥方式較合適。
本發明之異向發熱性片藉由具有上述構成,可將自上述發熱層產生之熱沿特定方向釋出而高效率地利用其能量。又,上述氣凝膠層發揮較高之絕熱性,此外,上述發熱層具有反射遠紅外線之性質,因此,本發明之異向發熱性片具有優異之絕熱性與遠紅外線反射性,亦可發揮較高之隔熱性。進而,上述氣凝膠層發揮較高之遮音性,因此,本發明之異向發熱性片亦可發揮較高之遮音性。
圖1示出表示本發明之異向發熱性片之厚度方向剖面之一例之模式圖。
圖1中,異向發熱性片1具有氣凝膠層2與積層於該氣凝膠層2之一表面側之發熱層3之積層體,於該積層體之發熱層3側積層有第1樹脂層4,於氣凝膠層2側積層有第2樹脂層5。
於圖1之異向發熱性片1中,藉由施加電壓而自發熱層3產生之熱受到氣凝膠層2阻礙,故不易釋出至第2樹脂層5側,而主要釋出至第1樹脂層4側。
本發明之異向發熱性片即便於以單體使用之情形時,亦可使用 於例如具有加熱功能之潛水服或太空衣、融雪片、防結露片、玻璃貼附用發熱性片、鍋蓋等保溫調理器具、水槽保溫材等用途。
本發明之異向發熱性片於作為層合玻璃用中間膜製造層合玻璃之情形時,可發揮尤其高之異向發熱性。認為其原因在於:於將本發明之異向發熱性片作為層合玻璃用中間膜製造層合玻璃時,於高壓釜之步驟中成為高溫高壓之狀態,藉此,可使氣凝膠中之溶劑較通常進一步蒸發,從而成為孔隙更多之氣凝膠。進而,認為其原因在於:藉由進行層合玻璃化,氣凝膠變得不易吸濕,而可保持孔隙更多之狀態,因此,使熱特別不易通過而絕熱性提高。
又,由本發明之異向發熱性片構成之層合玻璃用中間膜亦為本發明之一。
本發明之層合玻璃用中間膜之剖面形狀亦可為楔形。若層合玻璃用中間膜之剖面形狀為楔形,則可對應於層合玻璃之安裝角度來調整楔形之楔角θ,藉此,於用於操作者不降低視線便可同時視認前方視野與儀錶顯示之抬頭顯示器時,可防止雙重像或重影之產生。就進一步抑制雙重像之觀點而言,上述楔角θ之較佳之下限為0.1mrad,更佳之下限為0.2mrad,進而較佳之下限為0.3mrad,較佳之上限為1mrad,更佳之上限為0.9mrad。
再者,例如藉由使用擠出機將樹脂組成物擠出成形之方法製造剖面形狀為楔形之層合玻璃用中間膜之情形時之形狀亦包含於楔形中。即,存在成為自薄側之一端部略朝內側之區域(具體而言,於將一端與另一端之間之距離設為X時,薄側之一端朝向內側0X~0.2X之距離之區域)具有最小厚度之形狀之情況。又,存在成為自厚側之一端部略朝內側之區域(具體而言,於將一端與另一端之間之距離設為X時,自厚側之一端朝向內側0X~0.2X之距離之區域)具有最大厚度之形狀之情況。於本說明書中,此種形狀亦包含於楔形中。再者,上述層合玻璃用中間膜之一端與另一端之距離X較佳為3m以下,更佳為2m以下,尤佳為1.5m以下,較佳為0.5m以上,更佳為0.8m以上,尤佳為 1m以上。
於本發明之層合玻璃用中間膜之剖面形狀為楔形之情形時,例如將上述氣凝膠層及發熱層之厚度設為固定範圍,另一方面,調整上述第1樹脂層及/或第2樹脂層之形狀,藉此,可以作為層合玻璃用中間膜整體之剖面形狀成為固定楔角之楔形之方式進行調整。
將本發明之層合玻璃用中間膜積層於一對玻璃板之間而成之層合玻璃亦為本發明之一。
上述玻璃板可使用通常使用之透明板玻璃。例如,可列舉:浮式平板玻璃、研磨板玻璃、模板玻璃、烙網玻璃、夾絲板玻璃、經著色之板玻璃、熱線吸收玻璃、熱線反射玻璃、綠玻璃等無機玻璃。又,亦可使用於玻璃之表面具有紫外線屏蔽塗層之紫外線屏蔽玻璃。進而,亦可使用聚對苯二甲酸乙二酯、聚碳酸酯、聚丙烯酸酯等有機塑膠板。
作為上述玻璃板,亦可使用2種以上之玻璃板。例如,可列舉於透明浮式平板玻璃與如綠玻璃般經著色之玻璃板之間積層有本發明之層合玻璃用中間膜之層合玻璃。又,作為上述玻璃板,亦可使用2種以上之厚度不同之玻璃板。
作為本發明之層合玻璃之製造方法,並無特別限定,可使用先前公知之製造方法。具體而言,例如可列舉:使於至少2片玻璃板之間積層有層合玻璃用中間膜之積層體通過軋輥進行處理(抽吸脫氣法);或將其放入至橡膠袋中進行減壓抽吸(真空脫氣法);將玻璃板與中間膜之間所殘留之空氣脫氣並進行壓接,繼而,於例如高壓釜內對該積層體進行加熱加壓並壓接之方法等。
具備本發明之層合玻璃、及用以對該層合玻璃中之層合玻璃用中間膜之發熱層施加電壓之電壓供給部之層合玻璃系統亦為本發明之一。
根據本發明,可提供一種可將所產生之熱沿特定方向釋出而高效率地利用其能量且操作性亦優異之異向發熱性片、使用該異向發熱性片之層合玻璃用中間膜及層合玻璃。
1‧‧‧異向發熱性片
2‧‧‧氣凝膠層
3‧‧‧發熱層
4‧‧‧第1樹脂層
5‧‧‧第2樹脂層
圖1係表示本發明之異向發熱性片之厚度方向剖面之一例之模式圖。
以下,列舉實施例對本發明之態樣更詳細地進行說明,但本發明並不僅限定於該等實施例。
(實施例1)
(1)氣凝膠層之製備
向使TEMPO氧化纖維素奈米纖維以成為0.9重量%之方式分散於純水中而成之分散液20mL中滴加0.1M鹽酸10mL後,於室溫靜置1小時,藉此獲得水凝膠。對所獲得之水凝膠進行冷凍乾燥,藉此獲得由含有纖維素奈米纖維之聚合物氣凝膠構成之厚度250μm之氣凝膠層。
針對所獲得之含有纖維素奈米纖維之聚合物氣凝膠,依據JIS C 2151於23℃及濕度30%之條件進行拉伸試驗並求出拉伸破壞應變,結果為1.2%。
(2)發熱層之製備
以銀作為靶,對所獲得之氣凝膠層進行濺鍍。濺鍍功率設為直流(DC)1000W,環境氣體為氬氣且氣體流量設為50sccm,濺鍍時壓力設為0.5Pa,形成由銀構成之厚度20nm之發熱層。
所獲得之發熱層之表面電阻率為3.3Ω/□。
(3)樹脂層之製備
向聚乙烯醇縮丁醛100重量份中添加塑化劑40重量份、紫外線屏蔽劑0.5重量份、抗氧化劑0.5重量份,利用混合輥充分地進行混練而獲得組成物。藉由擠出機將所獲得之組成物擠出,獲得厚度380μm之單層樹脂層。
再者,聚乙烯醇縮丁醛之羥基含有率為30莫耳%,乙醯化度為1莫耳%,丁醛化度為69莫耳%,平均聚合度為1700。塑化劑使用三乙二醇二-2-乙基己酸酯(3GO)。紫外線屏蔽劑使用2-(2'-羥基-3'-第三丁基-5-甲基苯基)-5-氯苯并三唑(BASF公司製造之「Tinuvin 326」)。抗氧化劑使用2,6-二第三丁基對甲酚(BHT)。
(4)異向發熱性片之製造
準備2片所獲得之樹脂層,於其間夾入形成有發熱層之氣凝膠層,並進行熱壓接,藉此製造第1樹脂層/發熱層/氣凝膠層/第2樹脂層之積層結構之異向發熱性片。熱壓接係使用熱壓接積層機(MCK公司製造之「MRK-650Y型」)於加熱溫度90℃、壓接時之線壓0.05kN、搬送時之張力20N之條件藉由輥對輥方式進行。熱壓接使用上下輥均由橡膠構成之積層輥。
(5)層合玻璃之製造
將所獲得之異向發熱性片切成長120mm×寬100mm之大小。將所切取之異向發熱性片作為層合玻璃用中間膜夾入2片透明玻璃(長100mm×寬100mm×厚2.5mm)之間而獲得積層體。此時,所切取之異向發熱性片自透明玻璃端部沿縱向各伸出10mm。將所獲得之積層體放入至橡膠袋中,減壓至0.1MPa後於90℃保持5分鐘,並將玻璃板與中間膜之間所殘留之空氣脫氣,同時進行暫時壓接。繼而,使用高壓釜於150℃、壓力1.01MPa之條件將經暫時壓接之積層體壓接20分鐘而製造層合玻璃。其後,將自玻璃伸出之異向發熱性片之樹脂層切除而使發熱層露出。以發熱層與銅箔膠帶之銅箔相接之方式安裝單面銅箔膠帶 STS-CU42S(積水科技商務西日本公司製造)作為電極,進而,自其上安裝迴形針,藉此固定銅箔膠帶。
(實施例2)
向使TEMPO氧化纖維素奈米纖維以成為0.6重量%之方式分散於純水中而成之分散液20mL中滴加0.1M鹽酸10mL,並於室溫靜置1小時而獲得水凝膠。對所獲得之水凝膠進行冷凍乾燥,藉此獲得由含有纖維素奈米纖維之聚合物氣凝膠構成之厚度250μm之氣凝膠層。所獲得之氣凝膠層之拉伸破壞應變為1.0%。
除使用所獲得之氣凝膠層以外,以與實施例1相同之方式獲得異向發熱性片及層合玻璃。
(實施例3)
利用超純水將使聚葡萄胺糖10(和光純藥工業公司製造)1g溶解於乙酸2體積%水溶液50mL中而成之聚葡萄胺糖溶液以成為10g/L溶液之方式進行稀釋。向10g/L之聚葡萄胺糖水溶液中添加9重量%之丁醛水溶液1.5mL,轉移至培養皿中並密閉,於60℃靜置12小時而製作水凝膠。於室溫緩冷後,利用超純水對水凝膠反覆進行5次5小時浸漬洗淨,利用甲醇歷時3天以3次/天之頻度使水凝膠浸漬並洗淨。將所獲得之凝膠於室溫進行乾燥,藉此獲得由含有聚葡萄胺糖之聚合物氣凝膠構成之厚度250μm之氣凝膠層。
除使用所獲得之氣凝膠層以外,以與實施例1相同之方式獲得異向發熱性片及層合玻璃。
所獲得之氣凝膠層之拉伸破壞應變為1.0%。
(實施例4)
於氣凝膠層之製備中,將氣凝膠之乾燥方法自室溫乾燥設為利用二氧化碳而進行之超臨界乾燥,除此以外,以與實施例3相同之方法獲得厚度3000μm之 氣凝膠層。
除使用所獲得之氣凝膠層以外,以與實施例1相同之方式獲得絕熱性片及層合玻璃。
所獲得之氣凝膠層之拉伸破壞應變為1.2%。
(實施例5)
利用超純水將使聚葡萄胺糖10(和光純藥工業公司製造)2g溶解於乙酸2體積%水溶液100mL中而成之聚葡萄胺糖溶液以成為10g/L溶液之方式進行稀釋。向10g/L之聚葡萄胺糖水溶液中添加9重量%之丁醛水溶液3.0mL,轉移至培養皿並密閉,於60℃靜置12小時而製作水凝膠。於室溫緩冷後,利用超純水對水凝膠反覆進行5次5小時浸漬洗淨,並利用甲醇歷時3天以3次/天之頻度使水凝膠浸漬並洗淨。利用二氧化碳對所獲得之凝膠進行超臨界乾燥,藉此獲得由含有聚葡萄胺糖之聚合物氣凝膠構成之厚度7000μm之氣凝膠層。
除使用所獲得之氣凝膠層以外,以與實施例1相同之方式獲得絕熱性片及層合玻璃。
所獲得之氣凝膠層之拉伸破壞應變為1.5%。
(實施例6)
於氣凝膠層之製備中,將氣凝膠之乾燥方法自室溫乾燥設為利用二氧化碳而進行之超臨界乾燥,除此以外,以與實施例3相同之方法獲得厚度2000μm之氣凝膠層。
使用所獲得之氣凝膠層,並使用乙烯-乙酸乙烯酯共聚物樹脂(EVA、乙酸乙烯酯含量30質量%)代替聚乙烯醇縮丁醛作為構成樹脂層之樹脂,除此以外,以與實施例1相同之方式獲得絕熱性片及層合玻璃。
所獲得之氣凝膠層之拉伸破壞應變為1.0%。
(實施例7)
於氣凝膠層之製備中,將氣凝膠之乾燥方法設為利用二氧化碳而進行之超臨界乾燥,除此以外,以與實施例3相同之方法獲得厚度1000μm之氣凝膠層。
使用所獲得之氣凝膠層,並將第1樹脂層及第2樹脂層之厚度設為800μm,除此以外,以與實施例3相同之方式獲得絕熱性片及層合玻璃。
所獲得之氣凝膠層之拉伸破壞應變為1.0%。
(實施例8)
將脲2.5g與界面活性劑(溴化十六烷基三甲基銨)2.5g溶解於0.01M乙酸溶液50g中。於室溫進行攪拌同時使新戊四醇5.0g溶解後,添加矽烷氧化物(MTMS:甲基三甲氧基矽烷)20.0mL。為了促進水解,直接持續攪拌30分鐘後,以乾燥後之凝膠厚度成為2.0mm之方式調整攪拌後之液體之高度,然後靜置於60℃之恆溫槽中,於密閉條件使溶液凝膠化96小時。其後,為了將未反應物或界面活性劑去除,使用甲醇歷時3天以上以3次/天之頻度進行凝膠之洗淨,並藉由超臨界乾燥獲得厚度2000μm之氣凝膠層(有機無機混合二氧化矽氣凝膠A層)。
除使用所獲得之氣凝膠層以外,以與實施例1相同之方式獲得異向發熱性片及層合玻璃。再者,於將所獲得之異向發熱性片切成長120mm×寬100mm之大小時,以氣凝膠層不會破裂之方式使用砂紙對氣凝膠層進行研削,藉此製成長120mm×寬100mm之大小。
所獲得之氣凝膠層之拉伸破壞應變為0.20%。
(實施例9)
將脲2.5g與界面活性劑(溴化十六烷基三甲基銨)5.0g溶解於0.01M乙酸溶液50g中。於室溫進行攪拌,同時添加矽烷氧化物(MTMS:甲基三甲氧基矽烷)20.0mL與二乙二醇5.0mL。為了促進水解,直接持續攪拌30分鐘後,以乾燥後之凝膠厚度成為2.0mm之方式調整攪拌後之液體之高度,然後靜置於60 ℃之恆溫槽中,於密閉條件使溶液凝膠化96小時。其後,為了將未反應物或界面活性劑去除,使用甲醇歷時3天以上以3次/天之頻度進行凝膠之洗淨,並藉由超臨界乾燥獲得厚度2000μm之氣凝膠層(有機無機混合二氧化矽氣凝膠B層)。
除使用所獲得之氣凝膠層以外,以與實施例1相同之方式獲得絕熱性片及層合玻璃。再者,於將所獲得之異向發熱性片切成長120mm×寬100mm之大小時,以氣凝膠層不會破裂之方式使用砂紙對氣凝膠層進行研削,藉此製成長120mm×寬100mm之大小。
所獲得之氣凝膠層之拉伸破壞應變為0.30%。
(比較例1)
使用由聚對苯二甲酸乙二酯(PET)構成之厚度250μm之膜(TOYOBO公司製造,Cosmoshine A4300)作為基材。以銀作為靶,對上述基材進行濺鍍。濺鍍功率設為直流(DC)1000W,環境氣體為氬氣且氣體流量設為50sccm,濺鍍時壓力設為0.5Pa,形成由銀構成之厚度20nm之發熱層。
所獲得之發熱層之表面電阻率為3.3Ω/□。
準備2片藉由與實施例1相同之方法而製備之樹脂層,於其間夾入形成有發熱層之基材,並進行熱壓接,藉此製造第1樹脂層/發熱層/基材/第2樹脂層之積層結構之發熱性片。熱壓接使用熱壓接積層機(MCK公司製造之「MRK-650Y型」),以加熱溫度90℃、壓接時之線壓0.05kN並藉由輥對輥方式進行。熱壓接使用上下輥均由橡膠構成之積層輥。
切成長120mm×寬100mm之大小。將所切取之異向發熱性片作為層合玻璃用中間膜夾入至2片透明玻璃(長100mm×寬100mm×厚2.5mm)之間而獲得積層體。此時,所切取之異向發熱性片自透明玻璃端部沿縱向各伸出10mm。將所獲得之積層體放入至橡膠袋中,減壓至0.1MPa後於90℃保持5分 鐘,將玻璃板與中間膜之間所殘留之空氣脫氣,同時進行暫時壓接。繼而,使用高壓釜於150℃、壓力1.01MPa之條件將經暫時壓接之積層體壓接20分鐘而製造層合玻璃。其後,將自玻璃伸出之異向發熱性片之樹脂層切除而使發熱層露出。以發熱層與銅箔膠帶之銅箔相接之方式安裝單面銅箔膠帶STS-CU42S(積水科技商務西日本公司製造)作為電極,進而自其上安裝迴形針,藉此將銅箔膠帶固定。
(比較例2)
將脲2.5g與界面活性劑(溴化十六烷基三甲基銨)5.0g溶解於0.01M乙酸溶液50g中。於室溫進行攪拌,同時添加矽烷氧化物(MTMS:甲基三甲氧基矽烷)25.0mL。為了促進水解,直接持續攪拌30分鐘,然後靜置於60℃之恆溫槽中,並於密閉條件使溶液凝膠化96小時。此時,以乾燥後之凝膠厚度成為2mm之方式調整攪拌後之液體之高度。其後,為了將未反應物或界面活性劑去除,使用甲醇歷時3天以上以3次/天之頻度進行凝膠之洗淨後,藉由超臨界乾燥獲得厚度2000μm之氣凝膠層(無機二氧化矽氣凝膠層)。
除使用所獲得之氣凝膠層以外,以與實施例1相同之方式獲得絕熱性片及層合玻璃。再者,於將所獲得之異向發熱性片切成長120mm×寬100mm之大小時,以二氧化矽凝膠不會破裂之方式使用砂紙對二氧化矽凝膠進行研削,藉此製成長120mm×寬100mm之大小。
所獲得之氣凝膠層之拉伸破壞應變為0.08%。
(評價)
針對實施例及比較例中獲得之異向發熱性片及層合玻璃,藉由以下之方法進行評價。
將結果示於表1、2。
(1)異向發熱性片之操作性之評價
將於實施例及比較例中獲得之異向發熱性片切斷成寬3cm、長30cm之長度而獲得試片。將所獲得之試片放置於水平之載台上,以直線將長度方向之一端部之厚度方向之中心與另一端部之厚度方向之中心連結,以該直線與載台所成之角度成為30°之方式使試片彎曲。根據此時之異向發熱性片之狀態並藉由以下之基準對操作性進行評價。
○○:表層及氣凝膠未斷裂,且亦未產生褶皺及彎曲痕
○:表層及氣凝膠未斷裂,但產生褶皺或彎曲痕
△:僅氣凝膠斷裂
×:表層及氣凝膠斷裂
(2)異向發熱性之評價
於在實施例及比較例中獲得之層合玻璃之電極安裝鱷魚夾纜線,並利用黏著帶將熱電偶安裝於第1樹脂層側之玻璃表面與第2樹脂層側之玻璃表面之中心部。將該狀態之層合玻璃於保持為-18℃±2℃之低溫恆溫機(愛斯佩克股份有限公司製造之「PU-2J」)內靜置12小時,使用資料記錄器(基恩士股份有限公司製造之「NR-10000」)記錄玻璃表面溫度。
將鱷魚夾纜線與直流電源裝置PWR800L(KIKUSUI公司製造)連接,施加14V之電壓,測定第1樹脂層側之玻璃表面達到0℃之前所需之時間t1及第2樹脂層側之玻璃表面達到0℃之前所需之時間t2。比較例1之層合玻璃之t1為600秒,t2為605秒。獲得使用包含實施例之氣凝膠之異向發熱性片之層合玻璃之t1較其快而t2較其慢之結果,從而確認到層合玻璃之異向發熱性。
再者,於實施例之層合玻璃中,於判斷第2樹脂層側之玻璃表面達到0℃之可能性不存在之情形時,於經過比較例1之層合玻璃之t2後經過充分之時間後結束通電,判斷較比較例1之t2慢。
[產業上之可利用性]
根據本發明,可提供一種可將所產生之熱沿特定方向釋出而高效率地利用其能量且操作性亦優異之異向發熱性片、使用該異向發熱性片之層合玻璃用中間膜及層合玻璃。
Claims (9)
- 一種異向發熱性片,其具有含有氣凝膠之氣凝膠層與發熱層的積層體,且依據JIS C 2151進行拉伸試驗時所獲得之上述氣凝膠層之拉伸破壞應變為0.1%以上。
- 如請求項1所述之異向發熱性片,其中,氣凝膠為聚合物氣凝膠。
- 如請求項2所述之異向發熱性片,其中,聚合物氣凝膠含有選自由間苯二酚-福馬林樹脂、纖維素奈米纖維、聚醯亞胺、聚胺酯(polyurethane)及環氧樹脂所組成之群中之至少1種有機高分子材料。
- 如請求項1、2或3所述之異向發熱性片,其中,氣凝膠層之厚度為10μm以上且3mm以下。
- 如請求項1、2、3或4所述之異向發熱性片,其中,氣凝膠層之拉伸破壞應變為0.3%以上。
- 如請求項1、2、3、4或5所述之異向發熱性片,其於積層體之一面或兩面具有含有熱塑性樹脂之樹脂層。
- 如請求項6所述之異向發熱性片,其中,熱塑性樹脂為聚乙烯縮醛或乙烯-乙酸乙烯酯共聚物。
- 一種層合玻璃用中間膜,其係由請求項1、2、3、4、5、6或7所述之異向發熱性片構成。
- 一種層合玻璃,其中,請求項7所述之層合玻璃用中間膜積層於一對玻璃板之間。
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