TWI712721B - 人工皮革及其製造方法 - Google Patents

人工皮革及其製造方法 Download PDF

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TWI712721B
TWI712721B TW109112400A TW109112400A TWI712721B TW I712721 B TWI712721 B TW I712721B TW 109112400 A TW109112400 A TW 109112400A TW 109112400 A TW109112400 A TW 109112400A TW I712721 B TWI712721 B TW I712721B
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Taiwan
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paste
layer
thermoplastic polyurethane
polyurethane fiber
artificial leather
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TW109112400A
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English (en)
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TW202132655A (zh
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林至逸
鄭國光
黃建嘉
林家禾
曾彥綸
陳晉緯
林敬絡
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三芳化學工業股份有限公司
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Priority to CN202010430332.9A priority Critical patent/CN113291020B/zh
Priority to US17/098,558 priority patent/US11555271B2/en
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Publication of TWI712721B publication Critical patent/TWI712721B/zh
Publication of TW202132655A publication Critical patent/TW202132655A/zh

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
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  • Ceramic Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)

Abstract

本發明有關於一種人工皮革及其製造方法。人工皮革包含基材、熱塑性聚氨酯纖維接著層、熱塑性聚氨酯纖維層、糊劑層以及表面層。糊劑層具有熱固型糊劑或高固型糊劑,且糊劑具有特定的貼合溫度。此人工皮革之製造方法可於低溫下進行貼合,且由其所製之人工皮革具有良好的手感度及/或平整度。

Description

人工皮革及其製造方法
本發明係關於一種人工皮革及其製造方法,並且特別是關於一種可低溫貼合之人工皮革及其製造方法。
在習知人工皮革製造方法中,有機溶劑被大量使用,而導致環境汙染,其中前述有機溶劑常為高沸點及低揮發性之溶劑,例如二甲基甲醯胺(DMF)。在前述人工皮革製造方法中,需要使用高貼合溫度來進行表面層與堆疊材之貼合,因而產生耗能之問題。再者,於貼合時,大量有機溶劑容易導致人工皮革平整度變差。此外,前述人工皮革製造方法所製之人工皮革的手感度仍不佳。因此,亟需一種新的人工皮革及其製造方法來改善前述之缺點。
有鑑於上述之問題,本發明之一態樣是在提供一種人工皮革。人工皮革中的糊劑層具有特定的貼合溫度之糊劑。因此,此人工皮革之製造方法可於低溫下進行貼合。
本發明之另一態樣是在提供一種人工皮革之製造方法,以製造前述之人工皮革。
根據本發明之一態樣,提供一種人工皮革。人工皮革包含基材、設置於基材上的熱塑性聚氨酯纖維接著層、設置於熱塑性聚氨酯纖維接著層上的熱塑性聚氨酯纖維層、設置於熱塑性聚氨酯纖維層上的糊劑層、設置於糊劑層上的表面層。其中熱塑性聚氨酯纖維接著層介於熱塑性聚氨酯纖維層與基材之間,且糊劑層介於熱塑性聚氨酯纖維層與表面層之間。此外,糊劑層具有糊劑,且糊劑之貼合溫度為60℃至150℃。
依據本發明之另一實施例,糊劑包含熱固型糊劑及/或高固型糊劑。
依據本發明之再一實施例,表面層包含水性面料及/或油性面料。
根據本發明之另一態樣,提供一種人工皮革之製造方法。在前述人工皮革之製造方法中,先提供基材,再熔噴熱塑性聚氨酯纖維接著層至基材上。接著,熔噴熱塑性聚氨酯纖維層至熱塑性聚氨酯纖維接著層上,且熱塑性聚氨酯纖維接著層介於熱塑性聚氨酯纖維層與基材之間。然後,熱貼合基材、熱塑性聚氨酯纖維接著層及熱塑性聚氨酯纖維層,以形成堆疊材。
在形成堆疊材後,形成糊劑層於表面層上,其中糊劑層包含糊劑。然後,加熱糊劑層至貼合溫度,以將糊劑層貼合至堆疊材的熱塑性聚氨酯纖維層上,而製得人工皮 革,其中貼合溫度為60℃至150℃,且糊劑層介於表面層與熱塑性聚氨酯纖維層之間。
依據本發明之一實施例,糊劑包含熱固型糊劑及/或高固型糊劑。
依據本發明之另一實施例,熱固型糊劑包含架橋試劑。
依據本發明之再一實施例,表面層包含水性面料及/或油性面料。
應用本發明之人工皮革及人工皮革製造方法,其中糊劑層具有糊劑,且糊劑具有特定的貼合溫度,其中糊劑包含具有高揮發且低沸點的溶劑之熱固型糊劑及/或具有低有機溶劑的高固型糊劑。藉此,人工皮革之製造方法可於低貼合溫度下進行糊劑層與熱塑性聚氨酯纖維層之間的貼合,且由其所製之人工皮革具有良好的手感度及/或平整度。
100:人工皮革
110:基材
120:熱塑性聚氨酯纖維接著層
130:熱塑性聚氨酯纖維層
140:糊劑層
150:表面層
200:方法
210,220,230,240,250,260:步驟
為了對本發明之實施例及其優點有更完整之理解,現請參照以下之說明並配合相應之圖式。必須強調的是,各種特徵並非依比例描繪且僅係為了圖解目的。相關圖式內容說明如下:
〔圖1〕係繪示根據本發明之一實施例的人工皮革的結構示意圖。
〔圖2〕係繪示根據本發明之一實施例的人工皮革之製造 方法的流程圖。
以下仔細討論本發明實施例之製造和使用。然而,可以理解的是,實施例提供許多可應用的發明概念,其可實施於各式各樣的特定內容中。所討論之特定實施例僅供說明,並非用以限定本發明之範圍。
請參閱圖1,此圖係根據本發明之一實施例的人工皮革的結構示意圖。本發明之人工皮革100包含基材110、設置於基材110上的熱塑性聚氨酯纖維接著層120、設置於熱塑性聚氨酯纖維接著層120上的熱塑性聚氨酯纖維層130、設置於熱塑性聚氨酯纖維層130上的糊劑層140以及設置於糊劑層140上的表面層150。其中,基材110可為本發明技術領域中具有通常知識者所熟知的基材,例如:不織布、織布或超細纖維等。
前述熱塑性聚氨酯纖維接著層120係用於接著基材110與熱塑性聚氨酯纖維層130。熱塑性聚氨酯纖維接著層120係藉由熔噴方式而形成於基材110上。在一些實施例中,熱塑性聚氨酯纖維接著層120的材質為熱塑性聚氨酯樹酯。
相同於熱塑性聚氨酯纖維接著層120,前述熱塑性聚氨酯纖維層130亦藉由熔噴方式來形成於熱塑性聚氨酯纖維接著層120上。在一些實施例中,熱塑性聚氨酯纖維層130的材質為熱塑性聚氨酯樹酯。
糊劑層140係用於接著熱塑性聚氨酯纖維層130與表面層150。糊劑層140包含糊劑。糊劑包含熱固型糊劑及/或高固型糊劑。熱固型糊劑包含熱塑型聚氨酯(thermoplastic polyurethanes,TPU)及架橋試劑,其中架橋試劑不為有機錫類架橋劑。在一些實施例中,架橋試劑可為脂肪族聚異氰酸酯等架橋劑。藉由聚氨酯與架橋試劑產生架橋反應來提升熱固型糊劑之耐水性、耐化性及耐候性等性質。舉例而言,熱固型糊劑可為二液型接著劑。
此外,熱固型糊劑包含高揮發性且低沸點之溶劑,其中前述溶劑不為二甲基甲醯胺或甲苯。由於熱固型糊劑之溶劑具有高揮發性及低沸點之特性,故可降低人工皮革製造方法之貼合溫度。
熱固型糊劑包含熱塑型聚氨酯。在一些實施例中,前述聚氨酯的化學結構包含軟鏈段(soft segment)及硬鏈段(hard segment),其中軟鏈段為非結晶結構,軟鏈段的分子量為1500至3000g/mole,且較佳為2000g/mole。其次,硬鏈段具有不對稱的碳鏈之結構。前述軟鏈段的結構賦予熱固型糊劑非結晶性及在常溫下呈現軟質地的特性,以致於熱固型糊劑在固化後形成具有柔軟度及韌性之糊劑層140,從而改善人工皮革100之手感度。此外,熱固型糊劑之熱塑型聚氨酯之結構中之非結晶性軟鏈段可降低高固型糊劑的貼合溫度。
在一些實施例中,高固型糊劑包含聚氨酯,且其具 體例為聚胺基甲酸乙酯。高固型糊劑不具有或具有少量有機溶劑,其中前述溶劑不為二甲基甲醯胺、丁酮或甲苯。高固型糊劑之有機溶劑含量很低,不需要高溫加熱來進行貼合,故可降低人工皮革製造方法之貼合溫度。
在一些實施例中,糊劑之固形份為20至100%,其中熱固型糊劑之固形份為20至40%,而高固型糊劑之固形份為90至100%。在熱塑性聚氨酯纖維層130與表面層150之貼合過程,高固型糊劑不具有或具有少量有機溶劑,從而減少由有機溶劑所致之翹起問題,故高固型糊劑可改善人工皮革100的平整度。
在一些實施例中,糊劑之黏度為5000至30000cps,其中熱固型糊劑之黏度為5000至15000cps,而高固型糊劑之黏度為5000至30000cps。一般而言,固形份愈高,黏度愈高;反之則相反。其次,固形份會影響黏度,且黏度會影響糊劑層140的厚度。使用黏度為5000至30000cps之糊劑進行塗佈時,所形成之糊劑層140的厚度為0.16mm至0.30mm。厚度為0.16mm至0.30mm的糊劑層140具有柔軟度且不易斷裂,從而能夠提升人工皮革100的手感度。
前述表面層150用於提供人工皮革100的圖樣或紋路。此外,表面層150可包含水性面料及/或油性面料。在一些實施例中,水性面料的材質可為水性聚氨酯樹脂等,而且油性面料的材質可為油性聚氨酯樹脂等。在一些實施例中,水性面料及油性面料均可用於熱固型糊劑及高固型 糊劑。較佳地,油性面料適用於熱固型糊劑,水性面料適用於高固型糊劑。
請同時參閱圖1與圖2,其中圖2係根據本發明之一實施例的人工皮革之製造方法的流程圖。在本發明之人工皮革100之製造方法200中,首先提供基材110,如步驟210所示。
在前述步驟210後,熔噴熱塑性聚氨酯纖維接著層120至基材110上,如步驟220所示。步驟220係透過熔噴方式使熔融之熱塑性聚氨酯粒子形成熱塑性聚氨酯纖維,並將前述纖維堆疊在基材110上,以形成熱塑性聚氨酯纖維接著層120。
在一些實施例中,在前述步驟210與步驟220之間,可選擇性地對熱塑性聚氨酯粒子進行乾燥步驟,以降低熱塑性聚氨酯粒子的含水率,從而利於熔噴的進行。
在前述步驟220後,熔噴熱塑性聚氨酯纖維層130至熱塑性聚氨酯纖維接著層120上,其中熱塑性聚氨酯纖維接著層120介於熱塑性聚氨酯纖維層130與基材110之間,如步驟230所示。如前所述,在一些實施例中,熔融之熱塑性聚氨酯粒子係藉由熔噴方式形成熱塑性聚氨酯纖維層130。
由於熱塑性聚氨酯纖維接著層120係做為接著之用途,故熱塑性聚氨酯纖維接著層120之熱塑性聚氨酯粒子通常具備低熔點,以提供優越的接著性。然而,熱塑性聚氨酯纖維層130係提供人工皮革100手感度及剝離物性 強度。因此,熱塑性聚氨酯纖維層130之熱塑性聚氨酯粒子的熔點比熱塑性聚氨酯纖維接著層120之熱塑性聚氨酯粒子的熔點更高。
在一些實施例中,在前述步驟220與步驟230之間,進行熱塑性聚氨酯粒子的乾燥步驟。在前述步驟230後,熱貼合基材110、熱塑性聚氨酯纖維接著層120及熱塑性聚氨酯纖維層130,以形成堆疊材,如步驟240所示。在一些實施例中,步驟240係藉由履帶式貼合機或平面燙光輪來複合。
在前述步驟240後,形成具有糊劑之糊劑層140於表面層150上,如步驟250所示。糊劑層140及表面層150係如前所述,故在此不另贅述。
在前述步驟250後,加熱糊劑層140至貼合溫度,以將糊劑層140貼合至堆疊材的熱塑性聚氨酯纖維層130上,而製得人工皮革100,其中貼合溫度為60至150℃,且糊劑層140介於表面層150與熱塑性聚氨酯纖維層130之間,如步驟260所示。在一些實施例中,貼合溫度較佳可為70至140℃。在其他實施例中,貼合溫度較佳可為65至80℃。
如圖2所示,雖然步驟250係於步驟240後進行,但本發明不以此為限。在其他實施例中,步驟250係於步驟240後進行,即先進行步驟210至240後,再進行步驟250。然而,在其他實施例中,步驟250係可與步驟210至240同步進行,以獲得堆疊材及具有糊劑層140 的表面層150。然後,再進行步驟260。
人工皮革之製造方法200進一步可包含後加工塑型。在一些實施例中,後加工塑型的溫度為90至110℃。較佳地,後加工塑型的溫度為100℃。
舉例而言,後加工塑型可例如為使用高周波來進行,使用公母模來塑型,或者使用真空吸塑來進行。高周波之伏特數為60至90V,電流值為3至4A、模溫為50至100℃,且熔接秒數為5至10s。公母模塑型之上模溫度為90至110℃,下模溫度為90至110℃,熱壓時間為1至3min,且壓力為25至100kg/cm2。真空吸塑之加熱溫度為90至120℃,加熱時間為1至2min,吸塑時間為1至2min,且吸塑壓力為-760mmHg。
以下利用實施例以說明本發明之應用,然其並非用以限定本發明,任何熟習此技藝者,在不脫離本發明之精神和範圍內,當可作各種之更動與潤飾。
人工皮革之製造
實施例1
使用100%回收的聚對苯二甲酸乙二酯(PET)不織布做為基材110。接著,TPU粒子在60℃下乾燥4小時後,以使含水率降至100ppm以下。然後,熔噴經乾燥之TPU粒子,使其以纖維狀方式舖疊在前述不織布上,以形成熱塑性聚氨酯纖維接著層。然後,用於形成熱塑性聚氨酯纖維層之TPU粒子在80℃下乾燥4小時後,以使含水率為100ppm以下。然後,熔噴前述TPU粒子,使 其舖疊在前述熱塑性聚氨酯纖維接著層上,以形成熱塑性聚氨酯纖維層。接著,使用履帶式貼合機將熱塑性聚氨酯纖維接著層熱貼合至熱塑性聚氨酯纖維層,以形成堆疊材。
然後,將100克的油性聚氨酯樹脂與1至10克的珠光進行混合後,塗佈於離型紙上,其中塗佈之薄膜厚度為0.13至0.18mm。接著,在100℃下烘乾後,從離型紙上剝離前述薄膜,以形成油性面料。
承上,使用由三芳化學工業股份有限公司所生產的熱固型糊劑,其中熱固型糊劑包含具有分子量為1500至2500g/mole的軟鏈段與具有不對稱的碳鏈的硬鏈段之聚氨酯,且架橋試劑為脂肪族聚異氰酸酯。在熱固型糊劑使用前,才將聚氨酯與架橋試劑進行混合。塗佈熱固型糊劑於前述油性面料上,所塗佈的厚度為0.16至0.3mm。接著,在70℃下進行預烘,以在油性面料上形成糊劑層。再將前述糊劑層貼合至前述堆疊材的熱塑性聚氨酯纖維層上,以製得實施例1的人工皮革,關於實施例1之具體條件如表1所示。
實施例2至4
實施例2至4採用與實施例1相同的方式進行,不同之處主要在於製造堆疊材所使用設備與條件、表面層的種類、糊劑的種類及貼合的條件。實施例2及4使用由三芳化學工業股份有限公司所生產之高固型糊劑及水性聚氨酯之表面層,其中高固型糊劑為高固形份之聚胺基甲酸 乙酯的接著劑。實施例3使用包含具有分子量為1500至2500g/mole的軟鏈段與具有不對稱的碳鏈的硬鏈段之聚氨酯的熱固型糊劑及油性聚氨酯之表面層。關於實施例2至4之具體條件如表1所示。
比較例1
比較例1為習知濕式製程所製之人工皮革,其中使用聚對苯二甲酸乙二酯/耐綸(nylon)之基材、油性聚氨酯之纖維接著層、油性聚氨酯纖維層、含有DMF之油性聚氨酯的糊劑層、脂肪族聚異氰酸酯的架橋試劑及油性聚氨酯之表面層。糊劑層的厚度為0.16至0.3mm,且貼合溫度為150℃。
表1
Figure 109112400-A0101-12-0011-1
表1(續)
Figure 109112400-A0101-12-0012-2
評價方式
1.常溫耐屈撓性
本發明此處所稱之常溫耐屈撓性係依據標準方法SATRA PM55進行試驗,且其結果如表2所示。
2.剝離強度
本發明此處所稱之剝離強度係依據標準方法NIKE G44進行試驗,且其結果如表2所示。
3.軟硬度
本發明此處所稱之軟硬度係在溫度為22±2℃ 及溼度為50±10%之環境下進行測試,以軟硬度計(由MSA公司製造,且型號為ST300),使用25mm之縮環,分別測量前述各實施例及比較例之人工皮革之三個不同的部位之軟硬度,每一個部位測量一次,以三次數據計算出平均值,且其結果如表2所示。
4.翹邊評估
本發明此處所稱之翹邊評估係使用本發明之技術領域中慣用之檢測方法,針對人工皮革進行外緣翹起高度的量測,再根據前述翹起高度做評價,其具體評價標準如下,且其結果如表2所示。
○:人工皮革的外緣之翹起高度小於1cm
×:人工皮革的外緣之翹起高度等於或大於1cm
表2
Figure 109112400-A0101-12-0013-3
請參閱上表2,此表顯示本發明各實施例與比較例的人工皮革經過上述評價方式所獲得之結果。相較於比較例1之濕式製程所製的人工皮革,實施例1至4之所製得之人工皮革具有較佳的軟硬度,從而具有較佳的手感度。再者,相較於比較例1之濕式製程所製的人工皮革,實施例2及4所製得之人工皮革具有較小的外緣翹起高度,從而具有較佳的平整度,以利於後續的機器自動切割。
另一方面,就工皮革製製程而言,比較例1之濕式製程使用較高的溫貼合溫度(150℃),實施例1至4使用較低的溫貼合溫度(70至140℃),從而減少加工製程的耗能。
綜上所述,本發明之人工皮革包含基材、熱塑性聚氨酯纖維接著層、熱塑性聚氨酯纖維層、糊劑層以及表面層。糊劑層具有糊劑,且糊劑具有特定的貼合溫度,其中糊劑包含具有高揮發且低沸點的溶劑之熱固型糊劑及/或具有低有機溶劑的高固型糊劑。故,此人工皮革之製造方法可於低溫下進行貼合,且由其所製之人工皮革具有良好的手感度及/或平整度。
100:人工皮革
110:基材
120:熱塑性聚氨酯纖維接著層
130:熱塑性聚氨酯纖維層
140:糊劑層
150:表面層

Claims (7)

  1. 一種人工皮革,包含:一基材;一熱塑性聚氨酯纖維接著層,設置於該基材上;一熱塑性聚氨酯纖維層,設置於該熱塑性聚氨酯纖維接著層上,且該熱塑性聚氨酯纖維接著層介於該熱塑性聚氨酯纖維層與該基材之間;一糊劑層,設置於該熱塑性聚氨酯纖維層上,其中該糊劑層具有一糊劑,且該糊劑之一貼合溫度為60℃至150℃,該糊劑之一固形份為20至100%,該糊劑之一黏度為5000至30000cps;以及一表面層,設置於該糊劑層上,且該糊劑層介於該熱塑性聚氨酯纖維層與該表面層之間。
  2. 如請求項1之人工皮革,其中該糊劑包含一熱固型糊劑及/或一高固型糊劑,且該熱固型糊劑包含熱塑型聚氨酯,該熱塑型聚氨酯的化學結構包含分子量為1500至3000g/mole之軟鏈段。
  3. 如請求項1之人工皮革,其中該表面層包含一水性面料及/或一油性面料。
  4. 一種人工皮革之製造方法,包含:提供一基材; 熔噴一熱塑性聚氨酯纖維接著層至該基材上;熔噴一熱塑性聚氨酯纖維層至該熱塑性聚氨酯纖維接著層上,且該熱塑性聚氨酯纖維接著層介於該熱塑性聚氨酯纖維層與該基材之間;熱貼合該基材、該熱塑性聚氨酯纖維接著層及該熱塑性聚氨酯纖維層,以形成一堆疊材;形成一糊劑層於一表面層上,其中該糊劑層包含一糊劑,該糊劑之一固形份為20至100%,該糊劑之一黏度為5000至30000cps;以及加熱該糊劑層至一貼合溫度,以將該糊劑層貼合至該堆疊材的該熱塑性聚氨酯纖維層上,而製得該人工皮革,其中該貼合溫度為60℃至150℃,且該糊劑層介於該表面層與該熱塑性聚氨酯纖維層之間。
  5. 如請求項4之人工皮革之製造方法,其中該糊劑包含一熱固型糊劑及/或一高固型糊劑,且該熱固型糊劑包含熱塑型聚氨酯,該熱塑型聚氨酯的化學結構包含分子量為1500至3000g/mole之軟鏈段。
  6. 如請求項5之人工皮革之製造方法,其中該熱固型糊劑包含一架橋試劑。
  7. 如請求項4之人工皮革之製造方法,其中該表面層包含一水性面料及/或一油性面料。
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