CN113924210A - 热熔黏合剂组合物 - Google Patents
热熔黏合剂组合物 Download PDFInfo
- Publication number
- CN113924210A CN113924210A CN201980097227.3A CN201980097227A CN113924210A CN 113924210 A CN113924210 A CN 113924210A CN 201980097227 A CN201980097227 A CN 201980097227A CN 113924210 A CN113924210 A CN 113924210A
- Authority
- CN
- China
- Prior art keywords
- adhesive composition
- component
- melt adhesive
- melting point
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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Abstract
热熔黏合剂组合物,其含有:1‑丁烯均聚物、熔点低于80℃的乙烯系聚合物、熔点为80℃以上的α‑烯烃共聚物、增粘树脂、蜡及液状软化剂;乙烯系聚合物包含选自由乙烯‑α‑烯烃共聚物及乙烯‑醋酸乙烯酯共聚物所组成的组中的至少1种共聚物。
Description
技术领域
本发明涉及一种热熔黏合剂组合物。
背景技术
作为汽车内装材料的车门、仪表板、顶棚材料、后托盘、支柱等,一般由成形品及表皮材料所构成。作为成形品,主要是使用聚烯烃成形品。作为表皮材料,一直是使用:聚胺酯(polyurethane)发泡体、带聚胺酯发泡体的织物、带聚烯烃发泡体的片材等的表皮材料。这些成形品与表皮材料,是经由黏合剂并以加压成形法、真空成形法等来黏合。
作为汽车内装用黏合剂,尤其为了满足耐热蠕变特性,使用溶剂型的单组份反应类黏合剂(例如参照专利文献1及2)。然而,对环境应对的要求水平不断提高,正在期望从溶剂型黏合剂向无溶剂型黏合剂转换。
作为无溶剂型黏合剂,可以举出热熔黏合剂。热熔黏合剂中,反应型热熔黏合剂具有耐热性优异的优点,但具有难以获得熟化时间与涂布工作时和储存时的稳定性之间的平衡这样的缺点。考虑到当黏附体为聚烯烃成形品时的黏合性时,能够使用一种反应型热熔黏合剂,其是对聚烯烃进行硅烷改性而成(例如参照专利文献3)。然而,这样的反应型聚烯烃黏合剂会因熟化时的水解反应而向气氛中放出有机溶剂,作为环境对应型黏合剂存在悬念。
另一方面,非反应型热熔黏合剂,由于不会有源自原料及水解反应而发生有机溶剂挥发的疑虑,因此有希望作为环境对应型黏合剂。由于为非反应型,因此无须将黏合剂与黏附体贴合后的熟成时间,且涂布工作时及储存时的稳定性也高,因而使用方便。例如,在专利文献4中公开了一种汽车内装材料用预涂表皮材料,其是将非反应型热熔黏合剂预先涂布于汽车内装用表皮材料的背面而成。
以往技术文献
专利文献
专利文献1:日本特开平5-140522号公报
专利文献2:日本特开2005-290339号公报
专利文献3:日本特开2013-216724号公报
专利文献4:日本特开2004-284575号公报
发明内容
发明要解决的技术课题
由于冬季在仓库中保管、在寒冷地区运输等原因,涂布于表皮材料上的黏合剂无法维持充分的柔软性,在将预涂表皮材料弯曲时,黏合剂有时导致与连同表皮材料会一起破裂。因此,在低温环境中,以辊状来将预涂表皮材料保管、预涂表皮材料的处理工作等存在制约。于是,对于汽车内装用的热熔黏合剂,不仅寻求耐热性优异并且在低温下的柔软性优异。
本发明的目的在于提供一种热熔黏合剂组合物,其具有良好的黏合性及耐热性,且在低温下的柔软性优异。
用于解决技术课题的手段
本发明的热熔黏合剂组合物,其含有:1-丁烯均聚物、熔点低于80℃的乙烯系聚合物、熔点为80℃以上的α-烯烃共聚物、增粘树脂、蜡及液状软化剂;乙烯系聚合物包含选自由乙烯-α-烯烃共聚物及乙烯-醋酸乙烯酯共聚物所组成的组中的至少1种共聚物。
乙烯系聚合物的熔点可以为65℃以下。熔点为80℃以上的α-烯烃共聚物,可包含丙烯-α-烯烃共聚物。增粘树脂可包含氢化系增粘树脂。蜡可包含聚丙烯系蜡。上述热熔黏合剂组合物在180℃下的熔融黏度,可以为100Pa·s以下。
本发明的汽车内装用的预涂表皮材料,具备热熔黏合剂层及汽车内装用表皮材料,该热熔黏合剂层包含上述热熔黏合剂组合物。本发明所涉及的汽车内装材料,其通过至少将汽车内装用的预涂表皮材料与汽车内装用成形品黏合在一起而成。
发明效果
根据本发明,能够提供一种热熔黏合剂组合物,其具有良好的黏合性及耐热性,且在低温下的柔软性优异。
具体实施方式
以下,详细说明本发明的实施方式。但是,本发明不限于以下的实施方式。
[热熔黏合剂组合物]
本实施方式所涉及的黏合剂组合物,其含有:1-丁烯均聚物(以下有时称为“(A)成分”)、熔点低于80℃的乙烯系聚合物(以下有时称为“(B)成分”)、熔点为80℃以上的α-烯烃共聚物(以下有时称为“(C)成分”)、增粘树脂(以下有时称为“(D)成分”)、蜡(以下有时称为“(E)成分”)及液状软化剂(以下有时称为“(F)成分”)。本实施方式的黏合剂组合物是非反应型及无溶剂型的热熔黏合剂。
以下,对黏合剂组合物中所含的各成分进行详细叙述。本实施方式的各成分的含量,是以(A)、(B)、(C)、(D)、(E)及(F)成分((A)~(F)成分)的总量100质量份作为基准的比例。
((A)成分)
作为(A)成分的1-丁烯均聚物,能够通过源自均聚物的结晶性来对黏合剂组合物赋予耐热性。(A)成分的熔体流动速率(MFR)无特别限定。考虑到黏合剂组合物在180℃下的熔融粘度,(A)成分的MFR在190℃、荷载2.16kg的条件下,可以为50g/10分钟以上、100g/10分钟以上、或150g/10分钟以上。(A)成分的MFR(190℃、2.16kg)的上限值,例如可以为1000g/10分钟以下、800g/10分钟以下、或500g/10分钟以下。
考虑到黏合剂组合物的耐热性时,(A)成分的熔点可以为80℃以上、100℃以上、或120℃以上。(A)成分的熔点的上限值例如可以为150℃以下或140℃以下。(A)成分的熔点是测定(A)成分从熔融状态固化10日后的差示扫描热量(DSC)的、熔融峰的顶点的温度。作为(A)成分的市售物,例如可以举出LyondellBasell公司制的商品名“PB0800M”及“PB0801M”。(A)成分可以单独使用1种或组合2种以上使用。
(A)成分的含量,从黏合剂组合物的耐热性的观点来看,可以为10质量份以上,从提高黏合剂组合物的固化后的柔软性的观点来看,可以为30质量份以下。(A)成分的含量优选12~28质量份,更优选15~25质量份。
((B)成分)
作为(B)成分的熔点低于80℃的乙烯系聚合物,能够对黏合剂组合物赋予在低温下的耐龟裂性。通过(B)成分具有聚乙烯结构,可以推测在低温下的柔软性会提高。(B)成分包含选自由乙烯-α-烯烃共聚物及乙烯-醋酸乙烯酯共聚物所组成的组中的至少1种共聚物,因而黏合剂组合物在低温下的柔软性优异。
从进一步提高在低温下的耐龟裂性出发,(B)成分的熔点可以为75℃以下、70℃以下、65℃以下、或60℃以下。(B)成分的熔点的下限值例如可以为0℃以上、10℃以上、或20℃以上,(B)成分也可以不具有熔点。(B)成分的熔点,能够以与(A)成分的熔点相同的方法来进行测定。
作为用以构成乙烯-α-烯烃共聚物的α-烯烃,例如可以举出:丙烯、1-丁烯、1-辛烯等碳原子数3~8的α-烯烃,更优选碳原子数3或4的α-烯烃。
作为乙烯-α-烯烃共聚物的市售物,例如可以举出:Mitsui Chemicals,Inc.制的商品名“TAFMER DF605”、“TAFMER DF610”、“TAFMER DF640”、“TAFMER DF710”、“TAFMERDF740”、“TAFMER DF7350”、“TAFMER DF810”、“TAFMER DF840”、“TAFMER DF8200”、“TAFMERDF940”及“TAFMER DF9200”(“TAFMER”为注册商标)。乙烯-α-烯烃共聚物可以单独使用1种或组合2种以上使用。
作为乙烯·醋酸乙烯酯共聚物的市售物,例如可以举出:TOSOH CORPORATION的商品名“Ultrathene 635”、“Ultrathene 640”、“Ultrathene 634”、“Ultrathene 680”、“Ultrathene 681”、“Ultrathene 684”、“Ultrathene 685”、“Ultrathene 751”、“Ultrathene 710”、“Ultrathene 720”、“Ultrathene 722”、“Ultrathene 725”、“Ultrathene 735”、“Ultrathene 750”、“Ultrathene 752”及“Ultrathene 760”(“Ultrathene”为注册商标);DOW-MITSUI POLYCHEMICALS制的商品名“Evaflex EV 45X”、“Evaflex EV45LX”、“Evaflex EV 40W”、“Evaflex EV 40LX”、“Evaflex V5774ETWR”、“Evaflex V5772ETR”、“Evaflex V5773W”、“Evaflex EV 150”、“Evaflex EV 205WR”、“Evaflex EV 210”、“Evaflex EV 210ETR”、“Evaflex EV 220”、“Evaflex EV 220ETR”、“Evaflex EV 250”、“Evaflex EV 260”、“Evaflex EV 310”、“Evaflex EV 360”、“EvaflexV577”、“Evaflex EV 410”及“Evaflex EV 420”(“Evaflex”为注册商标)。乙烯-醋酸乙烯酯共聚物可以单独使用1种或组合2种以上使用。
(B)成分的含量,从能够进一步提高在低温下的耐龟裂性的观点来看,可以为1质量份以上、2质量份以上、或3质量份以上。(B)成分的含量,从进一步提高耐热性的观点来看,可以为20质量份以下、10质量份以下、或5质量份以下。
((C)成分)
作为(C)成分的熔点为80℃以上的α-烯烃共聚物,能够在使黏合剂组合物熔融时赋予黏性,并且能够提高黏合剂组合物的固化后的耐热性。(C)成分能够有助于提高黏合剂组合物的柔软性、胶黏性及耐热性。
(C)成分的熔点优选100℃以上,更优选110℃以上,进一步优选120℃以上。(C)成分的熔点的上限值无特别限定,可以为160℃以下或150℃以下。(C)成分的熔点能够以与(A)成分的熔点相同的方法来进行测定。
从柔软性的观点来看,(C)成分在23℃下的拉伸弹性模量可以为150MPa以下、100MPa以下、或50MPa以下。拉伸弹性模量能够根据ASTM D638,使用拉伸试验机来进行测定。
从柔软性的观点来看,(C)成分在23℃下的储存弹性模量(E’)可以为150MPa以下、100MPa以下、或50MPa以下。(C)成分的E’(23℃)的下限值无特别限定,例如可以为1MPa以上。E’(23℃)能够使用将黏合剂组合物形成为0.5mm厚度的片状的样品,并通过拉伸模式下的动态黏弹性测定来进行测定,该动态黏弹性测定是以应变0.05%、频率1Hz、从-70℃以升温速度3℃/分钟的条件下来进行。
α-烯烃共聚物可以为2种以上的α-烯烃单体的共聚物、或α-烯烃与α-烯烃以外的单体的共聚物。作为α-烯烃,例如可以举出:丙烯、1-丁烯、1-辛烯等碳原子数3~8的α-烯烃,优选碳原子数3或4的α-烯烃。作为α-烯烃以外的单体,例如可以举出:乙烯、醋酸乙烯酯等乙烯系化合物;(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸缩水甘油酯等具有(甲基)丙烯酰基的化合物;马来酸酐等不饱和羧酸化合物。(C)成分优选包含丙烯-α-烯烃共聚物(丙烯与丙烯以外的α-烯烃的共聚物)。此处,(甲基)丙烯酸酯是指丙烯酸酯或与其对应的甲基丙烯酸酯。
作为(C)成分的市售物,例如可以举出:Mitsui Chemicals,Inc.制的商品名“TAFMER BL2491M”、“TAFMER BL3450M”、“TAFMER BL3110M”、“TAFMER PN-2070”、“TAFMERPN-3560”、“TAFMER PN-2060”、“TAFMER PN-20300”及“TAFMER PN-0040”(“TAFMER”为注册商标)。(C)成分可以单独使用1种、或组合2种以上使用。
(C)成分的含量,从胶黏性的观点来看,可以为7~27质量份、9~25质量份、或12~22质量份。
((D)成分)
作为(D)成分的增粘树脂,例如可以举出:石油树脂、纯单体系石油树脂、氢化石油树脂、松香树脂、松香酯树脂、氢化松香树脂、萜烯树脂、萜烯酚树脂、芳香族改性萜烯树脂、氢化萜烯树脂、香豆酮·茚树脂、烷基酚树脂及二甲苯树脂。为了在使黏合剂组合物熔融时赋予黏性,(D)成分可以包含氢化石油树脂、氢化松香树脂、氢化萜烯树脂等的氢化增粘树脂。
作为(D)成分的市售物,例如可以举出:Arakawa Chemical Industries,Ltd.制的商品名“ARKON M90”、“ARKON M100”、“ARKON M115”、“ARKON M135”、“ARKON P90”、“ARKONP100”、“ARKON P115”、“ARKON P125”及“ARKON P140”(“ARKON”为注册商标);YASUHARACHEMICAL CO.,LTD.制的商品名“YS POLYSTER T80”、“YS POLYSTER T100”、“YS POLYSTERT115”、“YS POLYSTER T130”、“YS POLYSTER T145”、“YS POLYSTER T160”、“YS POLYSTERS145”、“YS POLYSTER G125”、“YS POLYSTER G150”、“CLEARON P85”、“CLEARON P105”、“CLEARON P115”、“CLEARON P125”、“CLEARON P135”及“CLEARON P150”(“CLEARON”为注册商标);Eastman Chemical Company制的商品名“Eastotac C-100R”、“Eastotac C-100L”、“Eastotac C-100W”、“Eastotac C-115R”、“Eastotac C-115L”、“Eastotac C-115W”、“Eastotac H-100R”、“Eastotac H-100L”、“Eastotac H-100W”、“Eastotac H-115R”、“Eastotac H-115L”、“Eastotac H-115W”、“Eastotac H-130R”、“Eastotac H-130L”、“Eastotac H-130W”、“Eastotac H-142R”、“Eastotac H-142W”、“Regalite R1090”、“Regalite R1100”、“Regalite S1100”、“Regalite R1125”、“Regalite R9100”、“RegaliteR7100”、“Regalite S7125”、“Regalite C6100”、“Regalite S5100”、“Regalrez 1085”、“Regalrez 1094”、“Regalrez 1126”、“Regalrez 1128”、“Regalrez 1139”、“Regalrez6108”及“Regalrez 3102”。(D)成分可以单独使用1种、或组合2种以上使用。
(D)成分的软化点可以为90℃以上、100℃以上、115℃以上、或125℃以上。(D)成分的软化点的上限值无特别限定,可以为160℃以下、150℃以下、或140℃以下。该软化点为环球法软化点。
(D)成分的含量,从胶黏性的观点来看,可以为10~50质量份、15~45质量份、或20~40质量份。
((E)成分)
作为(E)成分的蜡,除了通过黏合剂组合物的加热熔融时的粘度降低效果来对黏附体赋予润湿性以外,也有助于表现黏合剂组合物的冷却固化后的耐热性。(E)成分的软化点和/或熔点可以为100℃以上、120℃以上、或140℃以上。(E)成分的熔点能够以与(A)成分的熔点相同的方法来进行测定。考虑到黏合剂组合物对聚丙烯的黏合性时,(E)成分优选包含具有聚丙烯结构的聚丙烯系蜡。
作为(E)成分的市售物,例如可以举出:SANYO CHEMICAL INDUSTRIES,LTD.制的商品名“VISCOL 660-P”及“VISCOL 550-P”(“VISCOL”为注册商标)。(E)成分可以单独使用1种、或组合2种以上使用。
(E)成分的含量,从耐热性的观点来看,可以为4质量份以上,从柔软性的观点来看,可以为26质量份以下。(E)成分的含量优选8~22质量份,更优选10~20质量份。
((F)成分)
作为(F)成分的液状软化剂由于在常温为液状,因此在黏合剂组合物的加热熔融时会进一步增强胶黏性,而会提高对黏附体的密合性,且对在黏合剂组合物固化后形成的被膜赋予柔软性。
作为(F)成分,例如可以举出:液体石蜡、石蜡系加工油、环烷烃系加工油、芳香系加工油、酸酐改性液状烃、液状聚异戊二烯等液状橡胶及液状聚丁烯。考虑到与其它成分的良好的相溶性时,(F)成分优选包含液状聚丁烯等液状烃。
(F)成分在100℃下的动粘度可以为3mm2/s以上、30mm2/s以上、50mm2/s以上、或100mm2/s以上。(F)成分在100℃下的动粘度的上限值可以为1500mm2/s以下、1000mm2/s以下、或800mm2/s以下。动粘度能够根据JIS K2283来进行测定。
作为(F)成分的市售物,例如可以举出:NOF CORPORATION.制的商品名“日油POLYBUTENE 200N”、“日油POLYBUTENE 30N”、“日油POLYBUTENE 10N”及“日油POLYBUTENE3N”;Mitsui Chemicals,Inc.制“LUCANT HC-2000”、“LUCANT HC-600”及“LUCANT HC100”(“LUCANT”为注册商标)。(F)成分可以单独使用1种、或组合2种以上使用。
(F)成分的含量,从密合性及柔软性的观点来看,可以为5质量份以上,从耐热性的观点来看,可以为30质量份以下。(F)成分的含量优选10~25质量份,更优选13~22质量份。
(其它成分)
本实施方式所涉及的黏合剂组合物,根据需要,还可以含有:抗氧化剂、安定剂、着色剂、相溶化剂、抗结块剂等添加剂。相对于(A)~(F)成分的总量100质量份,添加剂的含量可以为20质量份以下、10质量份以下、或5质量份以下。
从涂布性及耐热性的观点来看,黏合剂组合物在180℃下的熔融粘度可以为100Pa·s以下、10~100Pa·s、或15~80Pa·s。熔融粘度能够根据JIS K6862,并使用B型粘度计来进行测定。
从能够熔融的温度及耐热性的观点来看,黏合剂组合物的软化点可以为115~170℃、125~160℃、或135~150℃。软化点能够根据JIS K6863,以环球法来进行测定。
本实施方式所涉及的黏合剂组合物,例如能够以下述工序来制作。首先,使用设定在180℃的捏合机来将(B)成分、(C)成分及(D)成分混炼并使其完全熔融后,添加(A)成分并混炼后,使其完全熔融。然后,添加(E)成分及(F)成分并混炼,而获得熔融物。将所获得的熔融物填充在脱模箱等中、或切割成颗粒(pellet)状等,并冷却固化,而制作黏合剂组合物。
本实施方式所涉及的黏合剂组合物为非反应型热熔黏合剂,具有良好的黏合性及耐热性,且在低温下的柔软性优异。该黏合剂组合物能够在低温时赋予优异的耐龟裂性,并且能够对将黏附体彼此黏合后的成形品赋予优异的耐热蠕变特性。
本实施方式所涉及的黏附体的黏合方法,可包括:将上述黏合剂组合物涂布于第1黏附体来形成热熔黏合剂层的工序;使热熔黏合剂层再活化的工序;及经由经再活化的热熔黏合剂层来将第1黏附体与第2黏附体压接的工序。黏合剂组合物在第1黏附体上的涂布量,例如可以为10~300g/m2。
[预涂表皮材料]
本实施方式所涉及的黏合剂组合物为考虑环境问题而得的无溶剂型黏合剂,且涂布后的处理限制较少。该黏合剂组合物能够作为汽车内装用黏合剂使用,该汽车内装用黏合剂会对聚烯烃等成形品显示优异的黏合性。将黏合剂组合物涂布于汽车内装用表皮材料上而形成热熔黏合剂层,能够制作汽车内装用的预涂表皮材料。本实施方式所涉及的预涂表皮材料,能够具备汽车内装用表皮材料及形成于该表皮材料上的本实施方式所涉及的热熔黏合剂层。经由预涂表皮材料的热熔黏合剂层来将汽车内装用成形品黏合,能够制作汽车内装材料。本实施方式所涉及的汽车内装材料,其通过至少将汽车内装用的预涂表皮材料与汽车内装用成形品黏合在一起而成。
本实施方式所涉及的预涂表皮材料,能够以下述方式制作:使用辊涂机等涂布装置,来将上述黏合剂组合物涂布于聚胺酯发泡体、带有聚胺酯发泡体的织物、带有聚烯烃发泡体的片材等的表皮材料上,而形成热熔黏合剂层。关于预涂表皮材料,例如即使在0℃以下的低温环境中弯曲,也不会发生龟裂。因此,预涂表皮材料的保管及搬运时的限制较少。能够以下述方式获得汽车内装材料:将预涂表皮材料加热,并在热熔黏合剂层熔融后,通过加压成形或真空成形来使其与聚烯烃成形品黏合。本实施方式所涉及的汽车内装材料,在以80℃、荷载100g来进行24小时的耐热蠕变试验后的剥离长度可以设为10mm以下。即,本实施方式所涉及的黏合剂组合物,作为汽车内装用黏合剂,具有良好的黏合性及耐热性,且在低温时的柔软性优异。
实施例
通过实施例及比较例来进一步详细说明本发明,但本发明并不限于这些例子。
准备下述(A)~(F)成分及抗氧化剂。
((A)成分:1-丁烯均聚物)
1-丁烯均聚物:LyondellBasell公司制的商品名“PB0800M”(熔点为124℃、MFR(190℃,2.16kg荷载)200g/10分钟)
((B)成分:熔点低于80℃的乙烯系聚合物)
α-烯烃共聚物(1):Mitsui Chemicals,Inc.制的商品名“TAFMER DF7350”(乙烯-α-烯烃共聚物,熔点为55℃,MFR(190℃,2.16kg荷载)35g/10分钟,拉伸弹性模量(23℃)10MPa,E’(23℃)9MPa)
α-烯烃共聚物(2):Mitsui Chemicals,Inc.制的商品名“TAFMER DF640”(乙烯-α-烯烃共聚物,熔点为39℃,MFR(190℃,2.16kg荷载)3.6g/10分钟,拉伸弹性模量(23℃)5MPa,E’(23℃)4MPa)
EVA(1):TOSOH CORPORATION制的商品名“Ultrathene 735”(乙烯-醋酸乙烯酯共聚物,醋酸乙烯酯含量28质量%,熔点为67℃,MFR(190℃,2.16kg荷载)1000g/10分钟)
EVA(2):TOSOH CORPORATION制的商品名“Ultrathene 710”(乙烯-醋酸乙烯酯共聚物,醋酸乙烯酯含量28质量%,熔点为69℃,MFR(190℃,2.16kg荷载)18g/10分钟)
((C)成分:熔点为80℃以上的α-烯烃共聚物)
α-烯烃共聚物(3):Mitsui Chemicals,Inc.制的商品名“TAFMER BL3450M”(1-丁烯-α-烯烃共聚物,熔点为100℃,MFR(190℃,2.16kg荷载)4.0g/10分钟,拉伸弹性模量(23℃):250MPa,E’(23℃):200MPa)
α-烯烃共聚物(4):Mitsui Chemicals,Inc.制的商品名“TAFMER PN-2070”(丙烯-α-烯烃共聚物,熔点为140℃,MFR(230℃,2.16kg荷载)7.0g/10分钟,拉伸弹性模量(23℃):14MPa,E’(23℃):15MPa)
((D)成分:增粘树脂)
增粘树脂(1):Arakawa Chemical Industries,Ltd.制的商品名“ARKON P140”(氢化石油树脂,软化点:140℃)
增粘树脂(2):Arakawa Chemical Industries,Ltd.制的商品名“ARKON P125”(氢化石油树脂,软化点:125℃)
((E)成分:蜡)
聚丙烯蜡:SANYO CHEMICAL INDUSTRIES,LTD.制的商品名“VISCOL 660-P”(熔点:145℃)
((F)成分:液状软化剂)
液状聚丁烯:NOF CORPORATION.制的商品名“日油POLYBUTENE 30N”(动粘度(100℃):670mm2/秒)
(抗氧化剂)
受阻酚系抗氧化剂:BASF Japan Ltd.制的商品名“Irganox 1010”
磷系抗氧化剂:BASF Japan Ltd.制的商品名“Irgafos 168”
[黏合剂组合物的制作]
(实施例1)
使用一种设定在180℃的内容积2L的捏合机,以使原料馈入量合计成为1kg的方式,将受阻酚系抗氧化剂0.5质量份、磷系抗氧化剂0.5质量份、α-烯烃共聚物(1)3.0质量份、α-烯烃共聚物(4)17.0质量份及增粘树脂(2)30.0质量份混炼,并使其完全熔融后,添加1-丁烯均聚物19.0质量份并混炼后,使其完全熔融。然后,添加聚丙烯蜡14.0质量份及液状聚丁烯17.0质量份并混炼后,使其熔融。将所获得的熔融物填充在脱模箱中,而获得黏合剂组合物。
(实施例2)
除了将α-烯烃共聚物(1)变更为α-烯烃共聚物(2)以外,与实施例1相同,而得到了黏合剂组合物。
(实施例3)
除了将α-烯烃共聚物(1)变更为EVA(1)以外,与实施例1相同,而得到了黏合剂组合物。
(实施例4)
除了将α-烯烃共聚物(1)变更为EVA(2)以外,与实施例1相同,而得到了黏合剂组合物。
(实施例5)
除了将增粘树脂(2)的量变更为27.0质量份、将聚丙烯蜡的量变更为17.0质量份以外,与实施例1相同,而得到了黏合剂组合物。
(实施例6)
除了将增粘树脂(2)30.0质量份变更为增粘树脂(1)27.0质量份、将聚丙烯蜡的量变更为17.0质量份以外,与实施例2相同,而得到了黏合剂组合物。
(比较例1)
除了将1-丁烯均聚物的量变更为22.0质量份、不添加α-烯烃共聚物(1)以外,与实施例1相同,而得到了黏合剂组合物。
(比较例2)
除了将α-烯烃共聚物(1)变更为α-烯烃共聚物(3)以外,与实施例1相同,而得到了黏合剂组合物。
(比较例3)
除了将1-丁烯均聚物的量变更为36.0质量份、不添加α-烯烃共聚物(4)以外,与实施例1相同,而得到了黏合剂组合物。
(比较例4)
除了不添加1-丁烯均聚物、将α-烯烃共聚物(4)的量变更为36.0质量份以外,与实施例1相同,而得到了黏合剂组合物。
(比较例5)
除了将聚丙烯蜡的量变更为31.0质量份、不添加液状聚丁烯以外,与实施例1相同,而得到了黏合剂组合物。
(比较例6)
除了不添加聚丙烯蜡、将液状聚丁烯的量变更为31.0质量份以外,与实施例1相同,而得到了黏合剂组合物。
[评价]
对在实施例及比较例中所制得的黏合剂组合物,进行下述评价。结果是如表1及表2所示。
(1)软化点测定
根据JIS K6863,以环球法来测定黏合剂组合物的软化点。
(2)粘度测定
根据JIS K6862,使用B型粘度计来测定黏合剂组合物在180℃下的熔融粘度。
(3)试验片的制作
准备带有聚丙烯发泡体的热塑性聚烯烃(TPO)片材(聚丙烯发泡体层厚度为2.0mm,TPO片材厚度为0.5mm,聚丙烯发泡体的发泡倍率为20倍)来作为表皮材料,并准备经异丙醇进行脱脂处理后的聚丙烯成形品(Hitachi Kasei Co.,Ltd.制,商品名“KOBEPOLYSHEET PP”的成形板,厚度为2.0mm)来作为聚烯烃成形品。使用一种设定在190℃的辊涂机,以100g/m2来将黏合剂组合物涂布于带有聚丙烯发泡体的TPO片材的聚丙烯发泡体层侧,而制作一种具有热熔黏合剂层的预涂表皮材料。在25℃将预涂表皮材料放置24小时后,使用远红外线加热器来将热熔黏合剂层加热,并在热熔黏合剂层的表面温度成为160℃时,从远红外线加热器将预涂表皮材料取出至25℃气氛中。然后,在热熔黏合剂的表面温度成为120℃的瞬间,通过加压成形(0.05MPa,10秒)来将预涂表皮材料与25℃的聚丙烯成形品压接,而制作试验片。比较例4的黏合剂组合物由于粘度显著增加而无法使用辊涂机来涂布,因此无法制作试验片。
(4)耐热蠕变
在制作试验片后24小时后,在80℃环境中,对试验片的表皮材料的一端施加垂直方向100g/25mm的荷载,而进行24小时的蠕变试验,并测定剥离长度。表1及2中,“A”表示从聚丙烯成形品侧的界面破坏,“B”表示表皮材料的材质破坏,“C”表示黏合剂层的凝集破坏。比较例3及5的黏合剂组合物的试验片,由于发生龟裂,因此不评价耐热蠕变。
(5)剥离黏合强度
在制作试验片后24小时后,在23℃环境中,使用拉伸试验机来测定180剥离黏合强度(拉伸速度:200mm/分钟,测定试验片宽度为25mm)。表1及2中,“A”表示从聚丙烯成形品侧的界面破坏,“B”表示表皮材料的材质破坏,“C”表示黏合剂层的凝集破坏。比较例3及5的黏合剂组合物的试验片,由于发生龟裂,因此不评价剥离黏合强度。
(6)耐龟裂性
在23℃环境中,将预涂表皮材料放置48小时后,将切割成100×50mm大小的预涂表皮材料,放置于低温槽内。在低温槽内,将预涂表皮材料放置30分钟后,将与低温槽相同温度的直径20mm的圆棒压在预涂表皮材料的中央部,使预涂表皮材料卷绕,在3秒内弯曲180°,目视确认了有无龟裂。耐龟裂性试验在按压于圆棒的面为黏合剂层侧的情况和表皮材料侧的情况下进行。将在两个试验中均未发生龟裂的情况下,耐龟裂性判定为“OK”,在至少其中一个试验中发生龟裂的情况下,耐龟裂性判定为“NG”。
[表1]
[表2]
Claims (8)
1.一种热熔黏合剂组合物,其含有:1-丁烯均聚物、熔点低于80℃的乙烯系聚合物、熔点为80℃以上的α-烯烃共聚物、增粘树脂、蜡及液状软化剂,
所述乙烯系聚合物包含选自由乙烯-α-烯烃共聚物及乙烯-醋酸乙烯酯共聚物所组成的组中的至少1种共聚物。
2.根据权利要求1所述的热熔黏合剂组合物,其中,所述乙烯系聚合物的熔点为65℃以下。
3.根据权利要求1或2所述的热熔黏合剂组合物,其中,所述熔点为80℃以上的α-烯烃共聚物包含熔点为80℃以上的丙烯-α-烯烃共聚物。
4.根据权利要求1至3中任一项所述的热熔黏合剂组合物,其中,所述增粘树脂包含氢化系增粘树脂。
5.根据权利要求1至4中任一项所述的热熔黏合剂组合物,其中,所述蜡包含聚丙烯系蜡。
6.根据权利要求1至5中任一项所述的热熔黏合剂组合物,其在180℃时的熔融粘度为100Pa·s以下。
7.一种汽车内装用的预涂表皮材料,其具备热熔黏合剂层及汽车内装用表皮材料,所述热熔黏合剂层包含权利要求1至6中任一项所述的热熔黏合剂组合物。
8.一种汽车内装材料,其中,至少将权利要求7所述的汽车内装用的预涂表皮材料与汽车内装用成形品黏合。
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