CN109476409A - 软包装用薄膜的制造方法 - Google Patents

软包装用薄膜的制造方法 Download PDF

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CN109476409A
CN109476409A CN201780043476.5A CN201780043476A CN109476409A CN 109476409 A CN109476409 A CN 109476409A CN 201780043476 A CN201780043476 A CN 201780043476A CN 109476409 A CN109476409 A CN 109476409A
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agent
manufacturing
flexible package
coated
catalyst
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CN109476409B (zh
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小川雅彦
高桥茂和
高田长
高田长一
市村直树
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DIC Corp
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Dainippon Ink and Chemicals Co Ltd
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Abstract

一种软包装用薄膜的制造方法:其为在基材上涂布有聚氨酯粘接剂的软包装用薄膜的制造方法,该聚氨酯粘接剂为A剂和B剂的混合液,该制造方法具有涂布于一个基材的A剂和B剂的混合液与涂布于另一基材的催化剂接触并压接的2液分别涂布工序,A剂为多异氰酸酯化合物且B剂为多元醇化合物。多元醇化合物优选为以聚醚多元醇或聚酯多元醇为必须成分的聚合物多元醇。

Description

软包装用薄膜的制造方法
技术领域
本发明涉及软包装用薄膜的制造方法、特别是具有分别涂布催化剂的工序的该制造方法。
背景技术
以往,作为软包装用薄膜的粘接剂,广泛使用了2液固化型聚氨酯树脂粘接剂。
对塑料薄膜实施了背面印刷的印刷,在其墨面涂布粘接剂并与另一塑料薄膜贴合,因此其墨妨碍使外观漂亮,要求外观的提高。
进而,对于使用了塑料层叠体的软包装材,优选硬的手感,由于粘接剂涂膜硬的手感良好,因此期望这样的制品。
另外,从提高软包装用薄膜的生产效率的观点出发,也有期望的性能。例如速固化性能提高、初期粘性的提高,可减少隧道现象、或能实现3层层压,因此是对2液固化型聚氨酯树脂粘接剂所期望的性能。
通常,将2液固化型聚氨酯树脂粘接剂涂布于软包装用的薄膜基材的情况下,通常为预先制备预先配混有除多异氰酸酯化合物以外的各成分的预混料,将使其与多异氰酸酯化合物混合而制备的粘接剂组合物涂布于基材的方法(例如参照专利文献1的0029段),该方法存在适用期因反应性高的异氰酸酯成分的影响而变得极短的缺点,其结果速固化性能提高、初期粘性提高的粘接剂设计变得困难。
现有技术文献
专利文献
专利文献1:日本特开2014-189639号公报
发明内容
发明要解决的问题
本发明的问题在于,提供一种通过仅对催化剂进行分别涂布,从而延长可提高生产效率的粘接剂的适用期、固化速度快的软包装用薄膜的制造方法。
用于解决问题的方案
本发明人等为了解决问题而进行了深入研究,结果发现如下软包装用薄膜的制造方法,完成了本发明:其为在基材上涂布有聚氨酯粘接剂的软包装用薄膜的制造方法,该聚氨酯粘接剂为A剂和B剂的混合液,该制造方法具有涂布于一被粘物的A剂和B剂的混合液与涂布于另一被粘物的催化剂接触并压接的2液分别涂布工序,A剂为多异氰酸酯化合物且B剂为多元醇化合物。
即,本发明提供一种软包装用薄膜的制造方法,其为在基材上涂布有聚氨酯粘接剂的软包装用薄膜的制造方法,该聚氨酯粘接剂为A剂和B剂的混合液,所述制造方法具有涂布于一个基材的A剂和B剂的混合液与涂布于另一基材的催化剂接触并压接的2液分别涂布工序,A剂为多异氰酸酯化合物且B剂为多元醇化合物。
另外,本发明提供使用了通过前述记载的制造方法得到的软包装用薄膜的食品用软包装材。
发明的效果
根据本发明,可以提供一种延长为了提高生产效率的粘接剂的适用期、固化速度快的软包装用薄膜的制造方法。
具体实施方式
(A剂多异氰酸酯化合物)
对于本发明中作为A剂使用的多异氰酸酯化合物,可列举出分子内具有至少2个异氰酸酯基的有机化合物。
作为有机多异氰酸酯化合物,例如可列举出甲苯二异氰酸酯、苯二甲基二异氰酸酯、二苯基甲烷二异氰酸酯、1,6-六亚甲基二异氰酸酯、异佛尔酮二异氰酸酯、4,4’-亚甲基双(环己基异氰酸酯)、赖氨酸二异氰酸酯、三甲基六亚甲基二异氰酸酯、1,3-二(异氰酸根合甲基)环己烷、1,5-萘二异氰酸酯、三苯基甲烷三异氰酸酯等多异氰酸酯;这些多异氰酸酯的加合体、这些多异氰酸酯的缩二脲体、或这些多异氰酸酯的异氰脲酸酯体等多异氰酸酯的衍生物(改性物)等。
本发明中使用的多异氰酸酯化合物可以作为固化剂而起作用并适宜选择来使用,可以为芳香族系,也可以为脂肪族系。作为本发明中优选使用的多异氰酸酯化合物,例如可列举出六亚甲基二异氰酸酯(HDI)、异佛尔酮二异氰酸酯(IPDI)、二苯基甲烷二异氰酸酯(MDI)等多异氰酸酯。
对于固化剂,仅通过多异氰酸酯化合物(B)就会体现性能,但也可以通过积极地组合使用多异氰酸酯化合物和后述的环氧树脂,利用固化涂膜赋予高度的耐水解性。
(B剂多元醇化合物)
本发明中作为B剂使用的多元醇化合物没有特别限定,例如可列举出选自聚酯多元醇、聚醚多元醇、聚氨酯多元醇、聚醚酯多元醇、聚酯(聚氨酯)多元醇、聚醚(聚氨酯)多元醇、聚酯酰胺多元醇、丙烯酸类多元醇、聚碳酸酯多元醇、多羟基烷烃、蓖麻油或它们的混合物中的聚合物多元醇。
作为聚酯多元醇,例如可列举出使对苯二甲酸、间苯二甲酸、己二酸、壬二酸、癸二酸等二元酸或它们的二烷基酯或它们的混合物与例如乙二醇、丙二醇、二乙二醇、丁二醇、新戊二醇、1,6-己二醇、3-甲基-1,5-戊二醇、3,3’-二羟甲基庚烷、聚氧乙二醇、聚氧丙二醇、聚四亚甲基醚二醇等二醇类或它们的混合物反应而得到的聚酯多元醇或使聚己内酯、聚戊内酯、聚(β-甲基-γ-戊内酯)等内酯类开环聚合而得到的聚酯多元醇。
作为聚醚多元醇,例如可列举出以例如水、乙二醇、丙二醇、三羟甲基丙烷、甘油等低分子量多元醇为引发剂将环氧乙烷、环氧丙烷、环氧丁烷、四氢呋喃等环氧乙烷(oxirane)类化合物聚合而得到的聚醚多元醇。作为聚醚酯多元醇,例如可列举出使对苯二甲酸、间苯二甲酸、己二酸、壬二酸、癸二酸等二元酸或它们的二烷基酯或它们的混合物与上述聚醚多元醇反应而得到的聚醚酯多元醇。
作为聚氨酯多元醇,为1分子中具有氨基甲酸酯键的多元醇,例如,可列举出为数均分子量200~20,000的聚醚多元醇与有机多异氰酸酯的反应物、且NCO/OH优选不足1、更优选为0.9以下的聚氨酯多元醇。有机多异氰酸酯可以使用后述的多异氰酸酯化合物、特别是二异氰酸酯化合物。
聚醚(聚氨酯)多元醇、聚酯(聚氨酯)多元醇可列举出为聚酯多元醇、聚醚酯多元醇等与有机多异氰酸酯的反应物、且NCO/OH优选不足1、更优选为0.9以下的聚醚(聚氨酯)多元醇、聚酯(聚氨酯)多元醇。
作为聚酯酰胺多元醇,可以通过在上述酯化反应时将例如乙二胺、丙二胺、六亚甲基二胺等具有氨基的脂肪族二胺一起作为原料使用而得到。
作为丙烯酸类多元醇的例子,可以通过使1分子中包含1个以上羟基的丙烯酸羟基乙酯、丙烯酸羟基丙酯、丙烯酸羟基丁酯等或与它们对应的甲基丙烯酸衍生物等与例如丙烯酸、甲基丙烯酸或它们的酯共聚而得到。
作为聚碳酸酯多元醇,例如可列举出通过选自乙二醇、丙二醇、1,4-丁二醇、1,5-戊二醇、1,6-己二醇、3-甲基-1,5-戊二醇、1,9-壬二醇、1,8-壬二醇、新戊二醇、二乙二醇、二丙二醇、1,4-环己二醇、1,4-环己烷二甲醇、双酚A、氢化双酚A中的1种或2种以上的二醇与碳酸二甲酯、碳酸二苯酯、碳酸亚乙酯、光气等的反应来获得。
作为多羟基烷烃,可列举出丁二烯、或使丁二烯与丙烯酰胺等共聚而得到的液状橡胶。
其中,特别优选聚醚(聚氨酯)多元醇。
另外,作为本发明中使用的多元醇化合物,也可以优选使用作为多异氰酸酯与双(羟基烷基)胺的反应物的末端具有脲键基的化合物。
对于前述多元醇化合物与多异氰酸酯化合物的配混比例,以多元醇化合物的固体成分羟基当量(a)与多异氰酸酯化合物的固体成分异氰酸酯当量(b)的当量比〔(b)/(a)〕成为0.5~4.0、更优选成为0.9~3.0的方式来设计。制造的详细情况记载于实施例中。
本发明中使用的粘接剂中根据需要可以含有除前述以外的其他添加剂。作为添加剂,可列举出形成薄膜、涂膜等的树脂组合物中通常使用的添加剂等。作为添加剂,例如,可列举出胶体状二氧化硅;氧化铝溶胶等无机微粒;聚甲基丙烯酸甲酯系的有机微粒;消泡剂;防流挂剂;硅烷偶联剂;粘性调整剂;紫外线吸收剂;金属减活剂;过氧化物分解剂;阻燃剂;补强剂;增塑剂;润滑剂;防锈剂;荧光性增白剂;无机系吸热剂;防火剂;抗静电剂;脱水剂;等。
对于本发明中使用的粘接剂,通常可以预先制备预先配混有除A剂的多异氰酸酯化合物以外的各成分的B剂的预混料,将其与A剂的多异氰酸酯化合物混合而制备。
进而,有时也出于促进粘接性及固化的目的而配混有含环氧基化合物的情况,作为含环氧基化合物,也有配混有三缩水甘油基三(2-羟基乙基)异氰脲酸酯、新戊二醇二缩水甘油醚、1,6-己二醇二缩水甘油醚、丙烯酰基缩水甘油醚、2-乙基己基缩水甘油醚、苯基缩水甘油醚、苯酚缩水甘油醚、对叔丁基苯基缩水甘油醚、己二酸二缩水甘油酯、邻苯二甲酸二缩水甘油酯、甲基丙烯酸缩水甘油酯、丁基缩水甘油醚等化合物、含有环氧基的分子量为几百~几千的低聚物、重均分子量为几千~几十万的聚合物的情况。
<其他添加剂>
本发明中,作为其他添加剂,可以使用公知惯用的热塑性弹性体、增粘剂、催化剂、磷酸化合物、三聚氰胺树脂、或反应性弹性体。对于这些添加剂的含量,可以在不损害本发明的粘接剂的功能的范围内适宜调整而使用。
<薄膜>
作为本发明中使用的薄膜,例如,可列举出纸、塑料薄膜、金属蒸镀薄膜或铜箔、铝箔之类的金属箔等。塑料薄膜为:由有机高分子树脂形成、进行熔融挤出后在长度方向和/或宽度方向拉伸,进而实施了热固定、冷却的双轴拉伸薄膜;或者进行熔融挤出后,在无拉伸下实施了热固定、冷却而成的无拉伸薄膜,作为有机高分子树脂,有烯烃系树脂、丙烯腈-丁二烯-苯乙烯共聚物(ABS树脂)、聚氯乙烯系树脂、氟系树脂、聚(甲基)丙烯酸类树脂、碳酸酯系树脂、聚酰胺系树脂、聚酰亚胺系树脂、聚亚苯基醚系树脂、聚苯硫醚系树脂,作为双轴拉伸薄膜,可列举出由聚对苯二甲酸乙二醇酯(PET)等聚酯系树脂得到的合成树脂薄膜、双轴拉伸聚丙烯(OPP)、聚偏氯乙烯涂布OPP(KOP)、尼龙(NY)、聚偏氯乙烯涂布尼龙、聚氯乙烯、聚乙烯醇、双轴拉伸聚苯乙烯(OPS)等。另外,作为无拉伸薄膜,可列举出LDPE(低密度聚乙烯)、LLDPE(直链状低密度聚乙烯)、MDPE(中密度聚乙烯)、HDPE(高密度聚乙烯)、EVA(乙烯-乙酸乙烯酯共聚物)、CPP(无拉伸聚丙烯)等。这些有机高分子树脂可以与其他有机单体少量共聚、或与其他有机聚合物混合。
另外也可列举出如铝蒸镀PET、二氧化硅蒸镀PET、氧化铝蒸镀PET、铝蒸镀CPP那样地在前述塑料薄膜上具有蒸镀膜的薄膜等。
作为前述薄膜的透明度,没有特别限定,要求透明性的情况下,优选具有50%以上的透光率。另外也可以对层叠有机层、无机层之前的塑料薄膜实施电晕放电处理、等离子体放电处理、火焰处理、表面粗糙化处理等表面处理、公知的锚固涂布处理、印刷、装饰等。
另外,前述薄膜的厚度优选3~500μm的范围、更优选6~300μm的范围。
本发明中使用的聚氨酯粘接剂例如可以以任意比例溶解/分散于酯系溶剂、酮系溶剂、芳香族系烃、脂肪族烃、脂环族烃等溶解性高的有机溶剂或分散剂中,使用模涂、唇口涂布、凹版涂布、直接反向凹版涂布(direct reverse gravure)、接触式反向凹版涂布(kiss reverse gravure)、无溶胶涂布、辊涂、反向涂布、刀涂(knife coating)、刮刀涂布(doctor coating)、挤压式涂布(extrusion coating)、坡流涂布(slide coat)、线棒涂布等公知的涂布方式而形成粘接层。
另外,本发明中使用的聚氨酯粘接剂也可以以不含酯系溶剂、酮系溶剂、芳香族系烃、脂肪族烃、脂环族烃等溶解性高的有机溶剂的所谓无溶剂型的形式而使用。
本发明中使用的聚氨酯粘接剂向薄膜的涂布量没有特别限制,例如,选自0.1~10g/m2、尤其0.1~5.0g/m2的范围,在能够以少量赋予优异的耐候性等这点而言是优选的。
本发明中,若涂布重量低于0.1g/m2,则会在连续均匀涂布性方面产生难点,另一方面,若超过10.0g/m2,则涂布后的溶剂脱离性也降低,操作性显著降低,而且会产生残留溶剂的问题。
<2液分别涂布工序>
对于本发明中的分别涂布工序,本发明中使用的粘接剂由A剂和B剂的混合物、及促进氨基甲酸酯反应的催化剂构成,所述分别涂布工序为涂布于一个被粘物的A剂和B液的混合液与涂布于另一被粘物的催化剂接触并压接的2液分别涂布工序,上述A剂为前述多异氰酸酯化合物,上述B剂为前述多元醇化合物。
本发明中使用的催化剂只要为用于促进氨基甲酸酯化反应的催化剂,就没有特别限制,例如,可以使用金属系催化剂、胺系催化剂、二氮杂二环十一碳烯(DBU)、或脂肪族环状酰胺化合物、钛螯合络合物等催化剂。
作为金属系催化剂,可列举出金属络合物系、无机金属系、有机金属系,作为金属络合物系,具体而言,为选自由Fe(铁)、Mn(锰)、Cu(铜)、Zr(锆)、Th(钍)、Ti(钛)、Al(铝)及Co(钴)组成的组中的金属的乙酰丙酮盐,例如,可列举出乙酰丙酮铁、乙酰丙酮锰、乙酰丙酮铜、乙酰丙酮锆等,这些当中,从毒性和催化剂活性的方面出发,优选乙酰丙酮铁(Fe(acac)3)或乙酰丙酮锰(Mn(acac)2)。
作为无机金属系催化剂,可列举出选自Fe、Mn、Cu、Zr、Th、Ti、Al及Co等中的催化剂。
作为有机金属系催化剂,可列举出二乙酸亚锡、二辛酸亚锡、二油酸亚锡、二月桂酸亚锡、二丁基氧化锡、二乙酸二丁基锡、二月桂酸二丁基锡、二丁基二氯化锡、二月桂酸二辛基锡、辛酸镍、环烷酸镍、辛酸钴、环烷酸钴、辛酸铋、环烷酸铋等。作为这些当中优选的化合物,为有机锡催化剂,进一步优选为二辛酸亚锡、二月桂酸二丁基锡。
叔胺催化剂只要为具有上述结构的化合物即可,没有特别限定,例如,可列举出三亚乙基二胺、2-甲基三亚乙基二胺、奎宁环、2-甲基奎宁环等。这些当中,从催化剂活性优异且工业上可获得的方面出发,优选三亚乙基二胺、2-甲基三亚乙基二胺。
作为其他叔胺催化剂,可列举出N,N,N’,N’-四甲基乙二胺、N,N,N’,N’-四甲基丙二胺、N,N,N’,N”,N”-五甲基二亚乙基三胺、N,N,N’,N”,N”-五甲基-(3-氨基丙基)乙二胺、N,N,N’,N”,N”-五甲基二丙烯三胺、N,N,N’,N’-四甲基六亚甲基二胺、双(2-二甲基氨基乙基)醚、二甲基乙醇胺、二甲基异丙醇胺、二甲基氨基乙氧基乙醇、N,N-二甲基-N’-(2-羟基乙基)乙二胺、N,N-二甲基-N’-(2-羟基乙基)二氨基丙烷、双(二甲基氨基丙基)胺、双(二甲基氨基丙基)异丙醇胺、3-奎宁环醇、N,N,N’,N’-四甲基胍、1,3,5-三(N,N-二甲基氨基丙基)六氢-均三嗪、1,8-二氮杂二环[5.4.0]十一碳烯-7、N-甲基-N’-(2-二甲基氨基乙基)哌嗪、N,N’-二甲基哌嗪、二甲基环己基胺、N-甲基吗啉、N-乙基吗啉、1-甲基咪唑、1,2-二甲基咪唑、1-异丁基-2-甲基咪唑、1-二甲基氨基丙基咪唑、N,N-二甲基己醇胺、N-甲基-N’-(2-羟基乙基)哌嗪、1-(2-羟基乙基)咪唑、1-(2-羟基丙基)咪唑、1-(2-羟基乙基)-2-甲基咪唑、1-(2-羟基丙基)-2-甲基咪唑等。
脂肪族环状酰胺化合物例如可列举出δ-戊内酰胺、ε-己内酰胺、ω-庚内酰胺、η-辛内酰胺、β-丙内酰胺等。这些当中,从固化促进效果优异的方面出发,优选ε-己内酰胺。
钛螯合络合物为通过紫外线照射会提高催化剂活性的化合物,从固化促进效果优异的方面出发,优选为以脂肪族或芳香族二酮为配体的钛螯合络合物。另外,本发明中,从本发明的效果更显著的方面出发,优选在作为配体的芳香族或脂肪族二酮的基础上还具有碳原子数2~10的醇。
本发明中,可以单独使用或组合使用前述催化剂。
对于前述催化剂的用量,将涂布于另一基材的粘接剂的B剂中的多元醇化合物设为100份时,为0.001~10份,优选为0.01~10份。
前述催化剂可以以溶液状或分散状用于涂布工序,可列举出乙二醇、二乙二醇、二丙二醇、丙二醇、丁二醇等醇类、矿油精(mineralturpentine)等烃类、乙酰丙酮及其氟化取代体等β-二酮类、乙酰乙酸甲酯、乙酰乙酸乙酯等酮酯类等可螯合化的溶剂、乙酰丙酮及其氟化取代体等β-二酮类、乙酰乙酸甲酯、乙酰乙酸乙酯等酮酯类等可螯合化的有机溶剂、作为增塑剂的邻苯二甲酸二辛酯、邻苯二甲酸二异壬酯、邻苯二甲酸异癸基酯、邻苯二甲酸二丁酯等邻苯二甲酸酯类、己二酸二辛酯、己二酸二异壬酯等己二酸酯类、癸二酸酯类等,可以利用聚乙烯多元醇或聚丙烯多元醇等多元醇、或本发明的多元醇化合物等制成溶液状或分散状来使用。另外,期望的是,催化剂预先与多元醇、异氰酸酯、预聚物混合而使用。
涂布有本发明中使用的粘接剂的层叠体优选在制作后进行蚀刻。蚀刻条件为室温~100℃下、12~240小时的期间,在该期间内进行固化反应。
将A剂和B剂的混合液涂布于一个基材后,将催化剂涂布于另一基材,进行压接,从而A剂和B剂的混合液与催化剂接触并发生反应。压接方法优选通过干式层压(干式层叠法)贴合的方法,层压辊的温度优选室温~120℃左右,圧力优选3~300kg/cm2左右。这样可以得到软包装薄膜。
另外,对于本发明中得到的软包装用薄膜,优选在制作后进行蚀刻。对于蚀刻条件,优选的温度为25~80℃,时间为12~240小时,在该期间产生粘接强度。本发明的层叠体可以用作例如包装用层叠层体。
根据本发明的软包装用薄膜的制造方法,能够制造层压薄膜的外观提高、软包装的手感变好的软包装用薄膜,得到的软包装用薄膜可以作为食品用包装材而利用。可以作为其他各种包装材料在工业上使用。
[实施例]
以下,通过实施例具体地说明本发明。
(实施例1)
在印刷完的OPP(双轴拉伸聚丙烯)薄膜20μm上以1.5g/m2涂布作为粘接剂的DIC株式会社制的芳香族系聚醚异氰酸酯2K-SF-220A(A剂)和聚醚多元醇HA-220B(B剂)的混合液(以下称为粘接剂混合液(1)),在一个CPP(无轴拉伸聚丙烯)30μm上以0.2g/m2涂布ε-己内酰胺6份和HA-220B 94份的混合液作为催化剂溶液,用轧辊(轧辊温度:50℃)对彼此的涂布面进行压接,制作塑料薄膜层叠体。加工速度为200m/分钟,粘接剂涂布量为1.7g/m2
对于2K-SF-220A和HA-220B,以配混比成为10/7的方式来调整。
(实施例2)
在CPP(无轴拉伸聚丙烯)30μm上以0.2g/m2涂布光潜在性钛催化剂1份和ε-己内酰胺5份和HA-220B 94份的混合液作为将要涂布的催化剂溶液,除此以外,与实施例1同样地操作,制作塑料薄膜层叠体。
(实施例3)
在CPP(无轴拉伸聚丙烯)30μm上以0.2g/m2涂布二月桂酸二丁基锡0.4份和HA-220B 99.6份的混合液作为将要涂布的催化剂溶液,除此以外,与实施例1同样地操作,制作塑料薄膜层叠体。
(实施例4)
在CPP(无轴拉伸聚丙烯)30μm上以0.4g/m2涂布光潜在性钛催化剂1份和ε-己内酰胺5份和HA-220B 94份的混合液作为将要涂布的催化剂溶液,将加工速度设为200m/分钟、将粘接剂涂布量设为1.9g/m2,除此以外,与实施例1同样地操作,制作塑料薄膜层叠体。
(实施例5)
在CPP(无轴拉伸聚丙烯)30μm上以0.1g/m2涂布光潜在性钛催化剂1份和ε-己内酰胺5份和HA-220B 94份的混合液作为将要涂布的催化剂溶液,将加工速度设为200m/分钟、将粘接剂涂布量设为1.5g/m2,除此以外,与实施例1同样地操作,制作塑料薄膜层叠体。
(比较例1)
在印刷完的OPP(双轴拉伸聚丙烯)薄膜20μm的墨面涂布作为2K-SF-220A(A剂)和聚醚多元醇HA-220B(B剂)的混合液的粘接剂混合液(1),用轧辊(轧辊温度:50℃)对其涂布面和CPP(无拉伸聚丙烯)30μm的电晕处理面进行压接,制作塑料薄膜层叠体。加工速度为200m/分钟、粘接剂涂布量为1.5g/m2。对于2K-SF-220和HA-220B,以配混比成为10/7的方式来调整。
(比较例2)
在印刷完的OPP(双轴拉伸聚丙烯)薄膜20μm上以1.0g/m2涂布2K-SF-220A(A剂),在一个CPP(无轴拉伸聚丙烯)30μm上以0.7g/m2涂布聚醚多元醇HA-220B(B剂),用轧辊(轧辊温度:50℃)对彼此的涂布面进行压接,制作塑料薄膜层叠体。加工速度为200m/分钟、粘接剂涂布量为1.7g/m2
(比较例3)
在印刷完的OPP(双轴拉伸聚丙烯)薄膜20μm上涂布2K-SF-220A(A剂)1.0g/m2和ε-己内酰胺0.012g/m2的混合液,在一个CPP(无轴拉伸聚丙烯)30μm上以0.7g/m2涂布聚醚多元醇HA-220B(B剂),用轧辊(轧辊温度:50℃)对彼此的涂布面进行压接,制作塑料薄膜层叠体。加工速度为200m/分钟、粘接剂涂布量为1.7g/m2
(比较例4)
在印刷完的OPP(双轴拉伸聚丙烯)薄膜20μm上涂布2K-SF-220A 1.0g/m2(A剂),在一个CPP(无轴拉伸聚丙烯)30μm上涂布HA-220B 0.7g/m2(B剂)和ε-己内酰胺0.012g/m2的混合液,用轧辊(轧辊温度:50℃)对彼此的涂布面进行压接,制作塑料薄膜层叠体。加工速度为200m/分钟、粘接剂涂布量为1.7g/m2
将层叠体制造时的适用期、固化速度的评价结果示于表1。
(判定方法)
(配混比管理)
采用下述判断基准。
〇:能够事前以重量换算计进行配混比管理。
Δ:若不使用涂布量计,则无法进行配混比管理。
×:不能进行配混比管理。
(适用期)
按照下述表1的涂布方式的配方,配混粘接剂后,立即在流变仪的测定部位载置约0.8g左右,在刚刚配混后的粘度成为1,000mPa·s左右的温度下测定30分钟。根据开始时和30分钟后的粘度值,进行以下的评价。
评价◎:30分钟后的粘度为开始时的配混液的粘度的1倍以上且不足2倍
评价○:30分钟后的粘度为开始时的配混液的粘度的2倍以上且不足3倍
评价Δ:30分钟后的粘度为开始时的配混液的粘度的3倍以上且不足4倍
评价×:30分钟后的粘度为开始时的配混液的粘度的4倍以上
合格线:〇以上
(固化速度)
压接后的塑料薄膜层叠体在40℃气氛下进行24小时的熟化后,在透过方式下进行红外吸收光谱测定,测定源自异氰酸酯的吸收光谱(2270cm-1附近)。
◎:异氰酸酯反应率为90%以上
〇:异氰酸酯反应率为80%以上
Δ:异氰酸酯反应率为70%以上
×:异氰酸酯反应率为50%以上
合格线:〇以上
[表1]
表1中缩略语及※1表示以下。
OPP:双轴拉伸聚丙烯
CPP:无轴拉伸聚丙烯
※1粘接剂混合液(1)表示DIC株式会社制的芳香族系聚醚异氰酸酯2K-SF-220A(A剂)和聚醚多元醇HA-220B(B剂)的混合液。
2K-SF-220A DIC株式会社制的芳香族系聚醚异氰酸酯
HA-220B DIC株式会社制的聚醚多元醇
对于通过具有本发明的分别涂布工序的软包装用薄膜的制造方法得到的软包装用薄膜,能够提供在制造时延长粘接剂的适用期、固化速度快的软包装用薄膜的制造方法。

Claims (5)

1.一种软包装用薄膜的制造方法,其特征在于,其为在基材上涂布有聚氨酯粘接剂的软包装用薄膜的制造方法,该聚氨酯粘接剂为A剂和B剂的混合液,所述制造方法具有涂布于一个基材的A剂和B剂的混合液与涂布于另一基材的催化剂接触并压接的2液分别涂布工序,A剂为多异氰酸酯化合物且B剂为多元醇化合物。
2.根据权利要求1所述的软包装用薄膜的制造方法,其中,多元醇化合物是以聚醚多元醇或聚酯多元醇为必须成分的聚合物多元醇。
3.根据权利要求1或2所述的软包装用薄膜的制造方法,其中,多异氰酸酯化合物为分子内具有至少2个异氰酸酯基的异氰酸酯化合物。
4.根据权利要求1~3中任一项所述的软包装用薄膜的制造方法,其中,催化剂具有选自金属系催化剂、胺系催化剂、二氮杂二环十一碳烯系催化剂、或脂肪族环状酰胺化合物、钛螯合络合物中的至少1种催化剂。
5.根据权利要求1~4中任一项所述的软包装用薄膜的制造方法,其中,基材为塑料薄膜、金属蒸镀薄膜、或金属箔。
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