CN105121492A - 聚氨酯结构粘合剂 - Google Patents
聚氨酯结构粘合剂 Download PDFInfo
- Publication number
- CN105121492A CN105121492A CN201480020968.9A CN201480020968A CN105121492A CN 105121492 A CN105121492 A CN 105121492A CN 201480020968 A CN201480020968 A CN 201480020968A CN 105121492 A CN105121492 A CN 105121492A
- Authority
- CN
- China
- Prior art keywords
- polyurethane adhesive
- diol
- bis
- aminomethyl
- range
- 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
Links
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- 230000001070 adhesive effect Effects 0.000 title claims abstract description 101
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 79
- 229920005862 polyol Polymers 0.000 claims abstract description 65
- 150000003077 polyols Chemical class 0.000 claims abstract description 65
- 150000002009 diols Chemical class 0.000 claims abstract description 49
- -1 poly(trimethylene oxide) Polymers 0.000 claims abstract description 48
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 48
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 48
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims abstract description 30
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 17
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- 229920000642 polymer Polymers 0.000 claims description 34
- 239000000758 substrate Substances 0.000 claims description 34
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 31
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims description 21
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- 238000006243 chemical reaction Methods 0.000 claims description 10
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- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical compound CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 6
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- FDLQZKYLHJJBHD-UHFFFAOYSA-N [3-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC(CN)=C1 FDLQZKYLHJJBHD-UHFFFAOYSA-N 0.000 claims description 5
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- PWGJDPKCLMLPJW-UHFFFAOYSA-N 1,8-diaminooctane Chemical compound NCCCCCCCCN PWGJDPKCLMLPJW-UHFFFAOYSA-N 0.000 claims description 4
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- VTAMQDCTAXRISX-UHFFFAOYSA-N 1-[2-(2-aminopropoxy)ethoxy]propan-2-amine Chemical compound CC(N)COCCOCC(C)N VTAMQDCTAXRISX-UHFFFAOYSA-N 0.000 claims description 4
- DPQHRXRAZHNGRU-UHFFFAOYSA-N 2,4,4-trimethylhexane-1,6-diamine Chemical compound NCC(C)CC(C)(C)CCN DPQHRXRAZHNGRU-UHFFFAOYSA-N 0.000 claims description 4
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- POTQBGGWSWSMCX-UHFFFAOYSA-N 3-[2-(3-aminopropoxy)ethoxy]propan-1-amine Chemical compound NCCCOCCOCCCN POTQBGGWSWSMCX-UHFFFAOYSA-N 0.000 claims description 4
- YOOSAIJKYCBPFW-UHFFFAOYSA-N 3-[4-(3-aminopropoxy)butoxy]propan-1-amine Chemical compound NCCCOCCCCOCCCN YOOSAIJKYCBPFW-UHFFFAOYSA-N 0.000 claims description 4
- CNPURSDMOWDNOQ-UHFFFAOYSA-N 4-methoxy-7h-pyrrolo[2,3-d]pyrimidin-2-amine Chemical compound COC1=NC(N)=NC2=C1C=CN2 CNPURSDMOWDNOQ-UHFFFAOYSA-N 0.000 claims description 4
- QTKDDPSHNLZGRO-UHFFFAOYSA-N 4-methylcyclohexane-1,3-diamine Chemical compound CC1CCC(N)CC1N QTKDDPSHNLZGRO-UHFFFAOYSA-N 0.000 claims description 4
- QLBRROYTTDFLDX-UHFFFAOYSA-N [3-(aminomethyl)cyclohexyl]methanamine Chemical compound NCC1CCCC(CN)C1 QLBRROYTTDFLDX-UHFFFAOYSA-N 0.000 claims description 4
- OXIKYYJDTWKERT-UHFFFAOYSA-N [4-(aminomethyl)cyclohexyl]methanamine Chemical compound NCC1CCC(CN)CC1 OXIKYYJDTWKERT-UHFFFAOYSA-N 0.000 claims description 4
- ISKQADXMHQSTHK-UHFFFAOYSA-N [4-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=C(CN)C=C1 ISKQADXMHQSTHK-UHFFFAOYSA-N 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 claims description 4
- YQLZOAVZWJBZSY-UHFFFAOYSA-N decane-1,10-diamine Chemical compound NCCCCCCCCCCN YQLZOAVZWJBZSY-UHFFFAOYSA-N 0.000 claims description 4
- QFTYSVGGYOXFRQ-UHFFFAOYSA-N dodecane-1,12-diamine Chemical compound NCCCCCCCCCCCCN QFTYSVGGYOXFRQ-UHFFFAOYSA-N 0.000 claims description 4
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- DPNYVVLIXCRDQZ-UHFFFAOYSA-N [5-(aminomethyl)-2-bicyclo[2.2.1]heptanyl]methanamine [6-(aminomethyl)-2-bicyclo[2.2.1]heptanyl]methanamine Chemical compound NCC1CC2CC1CC2CN.NCC1CC2CC(CN)C1C2 DPNYVVLIXCRDQZ-UHFFFAOYSA-N 0.000 claims description 2
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- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 9
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- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 8
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Classifications
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Abstract
本发明涉及一种由多元醇组分和多异氰酸酯组分组成的双组分聚氨酯粘合剂,其中多元醇组分包含分子量在1000至10000g/mol的三元醇,拥有两个伯羟基基团并且分子量在60至150g/mol的二元醇,分子量在200至3000g/mol的聚三亚甲基醚二醇或者聚四亚甲基醚二醇,和脂肪族多胺。所述粘合剂的特征在于高的早期强度、低的机械特性的温度的相关性、好的粘附性以及可控的热感应脱胶的可能性。
Description
技术领域
本发明涉及双组分聚氨酯粘合剂的领域,特别是粘弹性聚氨酯结构粘合剂。
背景技术
基于多元醇和多异氰酸酯的双组分聚氨酯粘合剂已经在多年前就开始应用。双组分聚氨酯粘合剂的优点是,混合后很快固化并因此在短时间后就已经可以吸收并传递较高的力。为了用作结构粘合剂,对此种粘合剂的强度和粘附力提出了很高的要求,因为此种粘合剂是承重结构的组成部分。
特别地,对于粘合剂,希望具有在结构粘合意义上的高强度并尽管如此在尽可能宽的温度范围内具有高的可伸长性,同时机械性能对于温度相关性不太显著。此外,粘合剂也应该尽可能快地构建一定的强度,也就是说,在它完全固化前已经可以承受一定的负荷,这样被粘合的部件很早就可以进行移动,或者固定粘合连接的装置可以尽早移去。此种特性也被称为“高早期强度”。此外,粘合剂应该不仅在环境温度下,而且也应该在通过热来加速的固化过程中可以固化至最终强度,并且在金属和非金属上基材上都表现出好的粘附性。
此外还需求这样的粘合剂,其满足前述特性并且还可以通过一种特殊的处理方法轻易地从基材上除去,或者基于已固化的粘合剂的粘接可以在不由于这种处理如高机械或热负荷而损坏基材的情况下被消除。
发明内容
本发明的目的因此在于,提供一种双组分聚氨酯粘合剂,所述粘合剂有高强度和高可伸长性并且机械性能对于温度的相关性非常弱,而且有高早期强度,因此非常适合作为结构粘合剂。
出人意料地发现,依据本发明的聚氨酯粘合剂可以达到所述目的。出人意料地发现,依据发明的聚氨酯粘合剂,因为使用聚三亚甲基醚二醇或者聚四亚甲基醚二醇作为多元醇组分,表现出提高的早期强度和非常好的粘附性,特别是在金属表面和玻璃纤维或碳纤维增强的塑料上的粘附性。这还特别体现在粘合之后的早期时间点上的高拉伸剪切强度值,以及完全固化的粘接的高拉伸剪切强度值。此外出人意料的是,当使用聚三亚甲基醚二醇时另外观察到特别小的弹性模量的温度相关性。
此外,使用聚三亚甲基醚二醇或者聚四亚甲基醚二醇的组合物,当应用≥120℃、特别是140℃至200℃的温度≥10分钟、特别是≥20分钟时允许粘合剂发生可控的热降解,这可以根据需要用于可控的脱胶。
本发明的其他方面为其他独立权利要求的主题。本发明的特别优选的实施方案是从属权利要求的主题。
具体实施方式
本发明涉及由多元醇组分K1和多异氰酸酯组分K2组成的聚氨酯粘合剂;其中:
多元醇组分K1包含
–至少一种平均分子量在1000至10000g/mol范围的三元醇A1,
–至少一种拥有两个伯羟基基团并且分子量在60至150g/mol范围的二元醇A2,
–至少一种平均分子量在200至3000g/mol范围的二元醇A3,其是聚三亚甲基醚二醇或者聚四亚甲基醚二醇,和
–至少一种分子量在60至500g/mol范围的脂肪族多胺PA;并且
多异氰酸酯组分K2包含
–至少一种多异氰酸酯B1,和
–至少一种具有异氰酸酯基团的聚氨酯聚合物B2;
其中,三元醇A1、二元醇A2和二元醇A3以这样的量存在,即重量比例(A1+A3)/A2在范围2.5至20之间、优选在3至15之间、特别在4至10之间,并且重量比例A1/A3在范围2至100之间、优选在3至75之间、特别在4至50之间。
在本文中,物质名称如“多元醇”、“多异氰酸酯”、“聚醚”或“多胺”中的前缀“多/聚”表示每种物质形式上每分子包含多于一个在名称中出现的官能团。
在本文中,“分子量”理解为分子的摩尔质量(克每摩尔)。“平均分子量”表示分子的低聚物或聚合物混合物的数均分子量(Mn),其通常借助于以聚苯乙烯为标准物的GPC确定。
“伯羟基基团”表示的是与具有两个氢的碳原子相连的OH基团。
在本文中,“开放时间”表示的是在组分混合后待粘合部件必须接合的时间。
在本文中,术语“强度”表示的是已经固化的粘合剂的强度,其中强度特别指的是抗拉强度和弹性模量(E-模量),特别是在拉伸范围0.05至0.25%下的。
在本文中,粘合连接的“脱胶”被定义为在其强度方面可控地削弱粘合剂。由此,通过使用相对小的力就可以使基材机械分离,也就是说,粘合连接可以很好地被解除。此种分离可以粘合剂和基材表面之间胶粘方式,或者粘合剂内部内聚方式实现。
在本文中,“室温”指的是温度23℃。
适合作为三元醇A1的特别是聚氧化亚烷基三醇,也被称为聚醚三醇。它是环氧乙烷、1,2-环氧丙烷、1,2-或2,3-环氧丁烷或者它们混合物的聚合产物。通常地,它们借助于拥有三个活性氢原子的起始剂分子如甘油、1,1,1-三羟甲基乙烷、1,1,1-三羟甲基丙烷或者它们的混合物进行聚合。
作为三元醇A1优选的是聚氧亚丙基三醇、聚氧亚乙基三醇和聚氧亚丙基-聚氧乙基三醇。
特别优选地,三元醇A1具有伯羟基基团;最优选地,其只具有伯羟基基团。
作为三元醇A1特别优选的是所谓的“EO-封端”(环氧乙烷封端)的聚氧亚丙基三醇。这是特殊的聚氧亚丙基-聚氧亚乙基三醇,其例如通过如下得到:使纯聚氧亚丙基三醇在聚丙氧基化反应完成后继续与环氧乙烷进行烷氧化,并因此具有伯羟基基团。与纯的聚氧亚乙基三醇相比,其具有更低的亲水性并且在室温下是液态的优点。
优选地,三元醇A1具有范围在2.2至3之间的平均OH-官能度。采用此种三元醇A1,得到具有良好的机械性能的粘合剂。
优选地,三元醇A1的平均分子量范围在3000至8000g/mol,特别优选在4000至6000g/mol,最优选在4500至5000g/mol。此种三元醇具有高官能度和链长的良好组合,由此获得具有良好的机械性能的粘合剂。
优选地,基于多元醇组分K1的总重量计,三元醇A1以30至60重量%的量使用。
此外,多元醇组分K1还包含至少一种具有两个伯羟基基团并且分子量在60至150g/mol范围的二元醇A2。分子量大于150g/mol的二元醇会造成已固化状态下明显更低的强度。
优选地,基于多元醇组分K1计,二元醇A2以2至15重量%的量使用。
适合作为二元醇A2的特别是1,2-乙二醇、1,3-丙二醇、1,4-丁二醇、1,5-戊二醇、1,6-己二醇、1,3-环己烷二甲醇、1,4-环己烷二甲醇和二乙二醇。这些二元醇具有几乎没有空间位阻的伯羟基,其与异氰酸基团特别有反应性。
特别优选的二元醇A2是线性二元醇,其特别选自1,3-丙二醇、1,4-丁二醇和1,5-戊二醇。这些二元醇有非常好的可操作性,因为它们几乎不亲水并且在室温下是液体,而且它们在粘合剂固化时在氨基甲酸酯键上产生大量链段,这有利于在宽的温度范围内同时具有好的可伸长性和高强度。其中,特别优选的是1,4-丁二醇和1,5-戊二醇,最优选的是1,4-丁二醇。
此外,多元醇组分K1还包含至少一种平均分子量范围在200至3000g/mol的二元醇A3,其为聚三亚甲基醚二醇或者聚四亚甲基醚二醇。
此种二元醇A3是有利的,因为在-35至85℃的温度下所述粘合剂具有微弱的机械性能的温度相关性,特别是在弹性模量、抗拉强度和断裂伸长率方面,特别是从这些性能的整体方面考虑。此外,这些二元醇A3有助于在粘合之后的早期时刻,特别是在1至5小时以后,优选3小时以后即产生高的拉伸剪切强度。
优选地,该二元醇A3具有800至2200g/mol范围的平均分子量。采用该二元醇A3在具有高强度的同时获得特别高的可伸长性。
在本发明的一个实施方案中,二元醇A3优选是聚三亚甲基醚二醇。这是有利的,因为所述粘合剂具有特别低的弹性模量的温度相关性。
优选地,合适的聚三亚甲基醚二醇有≥90重量%、特别优选≥95重量%由氧杂环丁烷的聚合产物或者由1,3-丙烷二醇的缩聚产物组成。该聚三亚甲基醚二醇可以特别通过缩聚反应制得,特别是通过1,3-丙二醇的酸催化缩聚反应或者通过氧杂环丁烷的开环聚合反应,特别是通过氧杂环丁烷的阳离子开环聚合反应制得。
优选地,聚三亚甲基醚二醇指的是式(I)的聚三亚甲基醚二醇,
其中
m和n分别彼此独立地是1至30,并且以使聚三亚甲基醚二醇的平均分子量范围在200至3000g/mol、特别是800至2200g/mol的方式进行选择,并且
R′是具有两个OH官能团、特别是两个伯OH官能团,在去除这两个OH官能团之后的有机多元醇,其优选地选自1,3-丙二醇、1,4-丁二醇和乙二醇,特别是1,3-丙二醇和乙二醇,最优选是1,3-丙二醇。
在本发明另一个实施方案中,二元醇A3优选是聚四亚甲基醚二醇。这是有利的,因为粘合剂有特别高的早期强度,这特别是表现在在粘合后的早期时间点之后具有高的剪切抗拉强度值。
优选地,合适的聚四亚甲基醚二醇有≥90重量%、特别优选≥95重量%由四氢呋喃的聚合产物或者1,4-丁二醇的缩聚产物组成。此种聚四亚甲基醚二醇可以例如通过缩聚反应制得,特别是通过1,4-丁二醇的酸催化缩聚反应或者通过四氢呋喃的开环聚合反应制得。
优选地,聚四亚甲基醚二醇指的是式(II)的聚四亚甲基醚二醇,
其中,
p和q分别彼此独立地是1至20,并且以使得聚四亚甲基醚二醇的平均分子量范围在200至3000g/mol、特别是800至2200g/mol的方式进行选择,并且
R”是具有两个OH官能团、特别是两个伯OH官能团,在去除这两个OH官能团之后的有机多元醇,其优选地选自1,3-丙二醇、1,4-丁二醇和乙二醇,特别是1,4-丁二醇和乙二醇,最优选是1,4-丁二醇。
有利地,二元醇A3的份额为基于多元醇组分K1计0.5至20重量%,优选为1至15重量%,特别是1至10重量%。
所述三元醇A1、二元醇A2和二元醇A3在粘合剂中以这样的量存在,即使得重量比例(A1+A3)/A2在2.5至20的范围内。此种粘合剂同时显示出高可伸长性和高强度,以及低的弹性模量的温度相关性。优选地,重量比例(A1+A3)/A2在3至15、特别在4至10的范围内。为了用作结构粘合剂,此种粘合剂的可伸长性的数值处于特别令人感兴趣的范围内。
所述三元醇A1和二元醇A3在粘合剂中以这样的量存在,即使得重量比例A1/A3在2至100、优选3至75、特别是4至50的范围内。
在所述二元醇A3是聚三亚甲基醚二醇的情况下,此重量比例A1/A3特别有益于获得不取决于温度的弹性模量。
在所述二元醇A3是聚四亚甲基醚二醇的情况下,此重量比例A1/A3在低温和室温下特别有益于获得在已固化状态下的高拉伸剪切强度。
此外,多元醇组分K1包含至少一种分子量在60至500g/mol,优选在60至240g/mol范围内的脂肪族多胺PA。
适合作为脂肪族多胺PA的是具有两个或三个脂肪族氨基基团的胺,特别是以下商业通用的多胺:
–脂肪族的、脂环族的或芳基脂肪族的伯二胺,特别如乙二胺、1,2-丙二胺、1,3-丙二胺、2-甲基-1,2-丙二胺、2,2-二甲基-1,3-丙二胺、1,3-丁二胺、1,4-丁二胺、1,3-戊二胺(DAMP)、1,5-戊二胺、1,5-二氨基-2-甲基-戊烷(MPMD)、2-丁基-2-乙基-1,5-戊二胺(C11-新二胺)、1,6-己二胺、2,5-二甲基-1,6-己二胺、2,2,4-和2,4,4-三甲基-六亚甲基二胺(TMD)、1,7-庚二胺、1,8-辛二胺、1,9-壬二胺、1,10-癸二胺、1,11-十一烷二胺、1,12-十二烷二胺、1,2-、1,3-和1,4-二氨基环己烷、1,4-二氨基-2,2,6-三甲基-环己烷(TMCDA)、双(4-氨基环己基)-甲烷(H12-MDA)、双(4-氨基-3-甲基环己基)-甲烷、双(4-氨基-3-乙基环己基)-甲烷、双(4-氨基-3,5-二甲基环己基)-甲烷、双(4-氨基-3-乙基-5-甲基环己基)-甲烷(M-MECA)、1-氨基-3-氨基甲基-3,5,5-三甲基环己烷(=异佛尔酮二胺或IPDA)、2-和4-甲基-1,3-二氨基环己烷和它们的混合物、1,3和1,4-双(氨基甲基)环己烷、2,5(2,6)-双(氨基甲基)-双环[2.2.1]庚烷(NBDA)、3(4),8(9)-双(氨基甲基)-三环[5.2.1.02,6]癸烷、1,8-薄荷烷二胺和1,3-和1,4-双(氨基甲基)苯;
–含醚基团的脂肪族伯二胺,特别如双(2-氨基乙基)醚、3,6-二氧杂辛烷-1,8-二胺、4,7-二氧杂癸烷-1,10-二胺、4,7-二氧杂癸烷-2,9-二胺、4,9-二氧杂十二烷-1,12-二胺、5,8-二氧杂十二烷-3,10-二胺、4,7,10-三氧杂十三烷-1,13-二胺和这些二胺的更高低聚体,3,9-双(3-氨基丙基)-2,4,8,10-四氧杂螺[5.5]-十一烷、双(3-氨基丙基)聚四氢呋喃和其它聚四氢呋喃二胺、RFD-270(来自Huntsman),以及聚氧亚烷基二胺(“聚醚-二胺”)。后者是通过聚氧亚烷基二醇的胺化反应制得的产品,并且例如可以名称(来自Huntsman)、Polyetheramin(来自BASF)或(来自Nitroil)获得。特别合适的聚氧亚烷基二胺是D230、D400、PolyetheraminD230、PolyetheraminD400、PCDA250和PCDA400;和
–聚氧亚烷基三胺(“聚醚-三胺”),其是由聚氧亚烷基三醇的胺化反应得到的产物并且例如可以商品名称如(来自Huntsman)、Polyetheramin(来自BASF)或PC(来自Nitroil)获得,特别是如T-403,PolyetheraminT403,和PCTA403。
特别优选地,多胺PA选自下组:1,5-二氨基-2-甲基戊烷、2,2,4-和2,4,4-三甲基六亚甲基二胺、1,8-辛二胺、1,10-癸二胺、1,12-十二烷二胺、1-氨基-3-氨基甲基-3,5,5-三甲基环己烷、2-和4-甲基-1,3-二氨基环己烷和它们的混合物、1,3-双(氨基甲基)环己烷、1,4-双(氨基甲基)环己烷、2,5(2,6)-双(氨基甲基)-双环[2.2.1]庚烷、3(4),8(9)-双(氨基甲基)-三环[5.2.1.02,6]癸烷、双(2-氨基甲基)醚、3,6-二氧杂辛烷-1,8-二胺、4,7-二氧杂癸烷-1,10-二胺、4,7-二氧杂癸烷-2,9-二胺、4,9-二氧杂十二烷-1,12-二胺、5,8-二氧杂十二烷-3,10-二胺、1,3-双(氨基甲基)苯和1,4-双(氨基甲基)苯。
这些多胺可特别良好地获得,并且在非常快速的反应中和异氰酸酯生成脲基,其有效地形成基于氢桥键的网络,这导致粘度的快速上升并由此可以有效地阻止粘合剂从基材上流下。由此制备的粘合剂具有特别高的强度,特别高的弹性模量,和不显著的机械性质的温度相关性。
其中优选的是1,3-双(氨基甲基)环己烷和1,3-双(氨基甲基)苯,最优选的是1,3-双(氨基甲基)苯。采用这类多胺,形成具有特别高强度的经固化的粘合剂。
优选地,脂肪族多胺PA以基于多元醇组分K1的总重量计0.1至3重量%的量使用。这种粘合剂可特别良好地加工。其表现出快速的稳固性(Standfestigkeit),而不会使得开放时间过短。
特别优选的聚氨酯粘合剂包含多元醇组分K1,其包含:
–至少一种平均分子量在1000至10000g/mol、特别是3000至8000g/mol范围内的三元醇A1,其优选的含量为30至60重量%,其中这特别指的是所谓的“EO封端”(环氧乙烷封端)的聚氧亚丙基三醇;
–至少一种具有两个伯羟基基团且分子量在60至150g/mol范围内的二元醇A2,其优选的含量为2至15重量%,其中这优选是1,4-丁二醇或1,5-戊二醇;
–至少一种平均分子量在200至3000g/mol、特别在800至2200g/mol范围内的二元醇A3,其是聚三亚甲基醚二醇或者聚四亚甲基醚二醇,其优选的含量为0.5至20重量%;和
–至少一种分子量在60至500g/mol范围内的脂肪族多胺PA,其优选的含量为0.1至3重量%,其中这优选是选自以下的脂肪族多胺:1,5-二氨基-2-甲基戊烷、2,2,4-和2,4,4-三甲基六亚甲基二胺、1,8-辛二胺、1,10-癸二胺、1,12-十二烷二胺、1-氨基-3-氨基甲基-3,5,5-三甲基环己烷、2-和4-甲基-1,3-二氨基环己烷和它们的混合物、1,3-双(氨基甲基)环己烷、1,4-双(氨基甲基)环己烷、2,5(2,6)-双(氨基甲基)-双环[2.2.1]庚烷、3(4),8(9)-双(氨基甲基)-三环[5.2.1.02,6]癸烷、双(2-氨基甲基)醚、3,6-二氧杂辛烷-1,8-二胺、4,7-二氧杂癸烷-1,10-二胺、4,7-二氧杂癸烷-2,9-二胺、4,9-二氧杂十二烷-1,12-二胺、5,8-二氧杂十二烷-3,10-二胺、1,3-双(氨基甲基)苯和1,4-双(氨基甲基)苯;
其中,重量比例(A1+A3)/A2在2.5至20、优选在3至15、特别是4至10的范围;
并且优选地,重量比例A1/A3在2至100、优选在3至75、特别是4至50的范围。
在此,所述的重量百分比是基于整个多元醇组分K1计的。
多异氰酸酯组分K2包含至少一种多异氰酸酯B1。
作为多异氰酸酯B1特别合适的是单体的二或三异氰酸酯,以及单体的二或三异氰酸酯的低聚体、聚合物和衍生物,以及它们的任意混合物。
特别合适的芳香族单体的二或三异氰酸酯是2,4-和2,6-甲苯二异氰酸酯和它们异构体的任意混合物(TDI)、4,4'-,2,4'-和2,2'-二苯基甲烷二异氰酸酯和它们异构体的任意混合物(MDI)、1,3-和1,4-亚苯基二异氰酸酯、2,3,5,6-四甲基-1,4-二异氰酸基苯、萘-1,5-二异氰酸酯(NDI)、3,3'-二甲基-4,4'-二异氰酸基联苯(TODI)、联茴香胺二异氰酸酯(DADI)、1,3,5-三(异氰酸基甲基)苯、三(4-异氰酸基苯基)甲烷和三(4-异氰酸基苯基)硫代磷酸酯。
特别合适的脂肪族单体的二或三异氰酸酯是1,4-四亚甲基二异氰酸酯、2-甲基五亚甲基-1,5-二异氰酸酯、1,6-六亚甲基二异氰酸酯(HDI)、2,2,4-和2,4,4-三甲基-1,6-六亚甲基二异氰酸酯(TMDI)、1,10-十亚甲基二异氰酸酯、1,12-十二亚甲基二异氰酸酯、赖氨酸-和赖氨酸酯二异氰酸酯、环戊烷-1,3-和-1,4-二异氰酸酯、1-甲基-2,4-和-2,6-二异氰酸基环己烷和它们异构体的任意混合物(HTDI或H6TDI)、1-异氰酸基-3,3,5-三甲基-5-异氰酸基甲基-环己烷(=异佛尔酮二异氰酸酯或IPDI)、全氢-2,4'-和-4,4'-二苯基甲烷二异氰酸酯(HMDI或H12MDI)、1,4-二异氰酸基-2,2,6-三甲基环己烷(TMCDI)、1,3-和1,4-双(异氰酸基甲基)环己烷、m-和p-苯二亚甲基二异氰酸酯(m-和p-XDI)、m-和p-四甲基-1,3-和-1,4-苯二亚甲基二异氰酸酯(m-和p-TMXDI)、双(1-异氰酸基-1-甲基乙基)萘、二聚-和三聚脂肪酸异氰酸酯如3,6-双(9-异氰酸基壬基)-4,5-二(1-庚烯基)环己烯(二聚的二异氰酸酯)和α,α,α',α',α”,α”-六甲基-1,3,5-均三甲苯三异氰酸酯。
特别适合的所述单体的二-和三异氰酸酯的低聚体、聚合物和衍生物是由MDI、TDI、HDI、和IPDI衍生出的。其中特别适合的是商业可得类型,特别是HDI-缩二脲如N100和N3200(来自Bayer)、HDB和HDB-LV(来自Rhodia)和24A-100(来自AsahiKasei);HDI-异氰尿酸酯,如N3300、N3600和N3790BA(全部来自Bayer),HDT-LV和HDT-LV2(来自Rhodia),和THA-100(来自AsahiKasei)和HX(来自NipponPolyurethane);HDI-脲二酮,如N3400(来自Bayer);HDI-亚氨基噁二嗪二酮,如XP2410(来自Bayer);HDI-脲基甲酸酯,如VPLS2102(来自Bayer);IPDI-异氰尿酸酯,例如溶液中的Z4470(来自Bayer)或固体形式的VesT1890/100(来自Degussa);TDI-低聚体,如IL(来自Bayer);以及基于TDI/HDI的混合异氰尿酸酯,例如HL(来自Bayer)。此外,特别适合的是在室温下以液体形式存在的MDI(所谓的“改性MDI”),其是MDI和MDI的衍生物,特别如MDI-碳二亚胺或MDI-脲酮亚胺或MDI-氨基甲酸酯的混合物,其已知作为商品名如CD、PF、PC(全部来自Bayer)或M143(来自Dow),以及MDI和MDI同系物(聚合的MDI和PMDI)的混合物,其可通过以下商标名获得如VL、VL50、VLR10、VLR20、VH20N和VKS20F(全部来自Bayer),M309、M229和M580(全部来自Dow)或M10R(来自BASF)。在实践中,上述低聚的多异氰酸酯通常是具有不同低聚度和/或化学结构的物质的混合物。有利地,其平均NCO-官能度是2.1至4.0。
优选地,多异氰酸酯B1是室温下液态形式的MDI。特别地,它们是所谓的聚合的MDI以及包含部分其低聚体或衍生物的MDI。此种液体形式MDI的MDI(=4,4'-,2,4'-和2,2'-二苯基甲烷二异氰酸酯和它们异构体的任意混合物)的含量特别是50至95重量%,特别是60至90重量%。
特别优选的多异氰酸酯B1是聚合的MDI,以及特别是在室温下为液体的MDI类型,其包含部分MDI-碳二亚胺或其加合物。
使用此种多异氰酸酯B1得到特别好的加工性能和特别高的强度。
此外,多异氰酸酯组分K2包含至少一种具有异氰酸酯基团的聚氨酯聚合物B2。
优选地,所述聚氨酯聚合物B2包含50至95质量百分数,特别是70至90质量百分数的聚氧亚烷基单元,特别优选是聚氧亚乙基和/或聚氧亚丙基单元,更特别优选的是聚氧亚丙基单元。此种聚氨酯聚合物具有低粘度并能实现良好的可伸长性。
优选地,聚氨酯聚合物B2的平均分子量在1000至20000g/mol,特别优选在2000至10000g/mol的范围内。
优选地,聚氨酯聚合物B2的平均NCO官能度在1.7至3、特别是1.8至2.5的范围内。此种聚氨酯聚合物能实现在已固化状态下的良好的加工性能和良好的机械性能。
特别优选地,聚氨酯聚合物B2的平均NCO官能度在2.05至2.5的范围内。此种聚氨酯聚合物能够实现特别好的可伸长性和高强度。
优选地,聚氨酯聚合物B2的游离异氰酸酯基团的含量在1至10重量%,特别优选在1至5重量%。
适合的具有异氰酸酯基团的聚氨酯聚合物B2可通过至少一种多异氰酸酯和至少一种多元醇的反应得到。该反应可以如此进行:采用常规方法例如在50至100℃的温度下,任选地并用合适的催化剂使所述多元醇和多异氰酸酯反应,其中如此计量加入多异氰酸酯,使得其异氰酸酯基团相对于多元醇的羟基以化学计量过量的量存在。有益地,如此计量加入多异氰酸酯,使得NCO/OH比例保持在1.3至5,特别是1.5至3。“NCO/OH比例”理解为所用的异氰酸酯基团的数量和所用的羟基的数量的比例。
合适的用于制备聚氨酯聚合物B2的多元醇特别是下列商业可得的多元醇或者它们的混合物:
-聚氧亚烷基多元醇,也称为聚醚多元醇或低聚醚醇,它们是环氧乙烷、1,2-环氧丙烷、1,2-或2,3-环氧丁烷、氧杂环丁烷、四氢呋喃或它们的混合物的聚合产物,其可能情况下借助具有两个或更多个活性氢原子的起始剂分子进行聚合,所述起始剂分子例如水、氨或具有多个OH-基团或NH-基团的化合物,例如1,2-乙二醇、1,2-和1,3-丙二醇、新戊二醇、二乙二醇、三乙二醇、异构的二丙二醇和三丙二醇、异构的丁二醇、戊二醇、己二醇、庚二醇、辛二醇、壬二醇、癸二醇、十一烷二醇、1,3-和1,4-环己烷二甲醇、双酚A、氢化双酚A、1,1,1-三羟甲基乙烷、1,1,1-三羟甲基丙烷、丙三醇、苯胺,以及前述化合物的混合物。既可以使用具有低不饱和度(根据ASTMD-2849-69测量并以每克多元醇的毫当量不饱和度(mEq/g)给出)的聚氧化亚烷基多元醇,其例如借助于所谓的双金属氰化物络合物催化剂(DMC-催化剂)制得,也可以使用具有较高不饱和度的聚氧亚烷基多元醇,其例如借助于阴离子催化剂如NaOH、KOH、CsOH或碱金属醇盐制得。
特别适合的是聚氧亚烷基二醇或聚氧亚烷基三醇,特备是聚氧亚乙基和聚氧亚丙基的二醇和三醇。
非常适合的是不饱和度低于0.02mEq/g且分子量在1000至30000g/mol范围内的聚氧亚烷基二醇和三醇,以及分子量为400至8000g/mol的聚氧亚丙基二醇和三醇。
特别适合的是所谓环氧乙烷封端(“EO-封端”,环氧乙烷封端)的聚氧亚丙基多元醇。
-苯乙烯-丙烯腈-或丙烯腈-甲基丙烯酸甲酯接枝的聚醚多元醇。
-聚酯多元醇,也称为低聚酯醇,其根据已知方法制备,特别是通过羟基羧酸的缩聚或者脂肪族和/或芳族多羧酸与二元醇或更多元醇的缩聚来制备。
特别适合作为聚酯多元醇的是由二元至三元醇,特别是二元醇与有机二羧酸或三羧酸,特别是二羧酸或它们的酸酐或酯制备的那些聚酯多元醇,其中所述二元至三元醇例如是乙二醇、二乙二醇、丙二醇、二丙二醇、新戊二醇、1,4-丁二醇、1,5-戊二醇、3-甲基-1,5-己二醇、1,6-己二醇、1,8-辛二醇、1,10-癸二醇、1,12-十二烷二醇、1,12-羟基硬脂醇、1,4-环己烷二甲醇、二聚脂肪酸二醇(二聚二醇)、羟基特戊酸新戊二醇酯、丙三醇、1,1,1-三羟甲基丙烷或者上述醇的混合物;所述有机二羧酸或三羧酸或它们的酸酐或酯例如是琥珀酸、戊二酸、己二酸、三甲基己二酸、辛二酸、壬二酸、癸二酸、十二烷二羧酸、马来酸、富马酸、二聚脂肪酸、邻苯二甲酸、邻苯二甲酸酐、间苯二甲酸、对苯二甲酸、对苯二甲酸二甲酯、六氢邻苯二甲酸、偏苯三酸和偏苯三酸酐,或者上述酸的混合物;以及由内酯例如由ε-己内酯和起始剂如前述的二元醇或三元醇制备的聚酯多元醇。
特别适合的聚酯多元醇是聚酯二醇。
-聚碳酸酯多元醇,如通过例如上述用于构建聚酯多元醇所使用的醇类与碳酸二烷基酯、碳酸二芳基酯或光气的反应可获得的那些。
-携带至少两个羟基基团的嵌段共聚物,它具有至少两个包含如上所述类型的聚醚结构、聚酯结构和/或聚羧酸酯结构的不同嵌段,特别是聚醚聚酯多元醇。
-聚丙烯酸酯多元醇和聚甲基丙烯酸酯多元醇。
-多羟基官能的脂肪和油,例如天然脂肪和油,特别是蓖麻油;或者通过对天然脂肪和油进行化学改性而获得的(所谓的油脂化学)多元醇,例如通过不饱和油的环氧化和随后用羧酸或醇进行开环作用而得到的环氧聚酯或环氧聚醚,或者通过不饱和油的氢甲酰化和氢化而得到的多元醇;或者由天然脂肪和油通过分解工艺如醇解或臭氧分解并随后对如此获得的分解产物或其衍生物进行化学键接,例如酯交换或二聚作用而得到的多元醇。天然脂肪和油的适合的分解产物特别是脂肪酸和脂肪醇以及脂肪酸酯,尤其是甲基酯(FAME),其例如可以通过氢甲酰化和氢化而被衍生化成羟基脂肪酸酯。
-聚烃多元醇,也称为低聚烃醇(Oligohydrocarbonole),例如多羟基官能的聚烯烃、聚异丁烯、聚异戊二烯;多羟基官能的乙烯-丙烯-、乙烯-丁烯-或乙烯-丙烯-二烯-共聚物,例如可由KratonPolymers公司制备的那些;二烯的多羟基官能聚合物,特别是1,3-丁二烯的多羟基官能聚合物,其特别也可以由阴离子聚合来制备;由二烯如1,3-丁二烯或二烯混合物和乙烯基单体如苯乙烯、丙烯腈、氯乙烯、醋酸乙烯酯、乙烯醇、异丁烯和异戊二烯得到的多羟基官能的共聚物,例如多羟基官能的丙烯腈/丁二烯共聚物,其可例如由环氧化物或氨基醇和羧基封端的丙烯腈/丁二烯共聚物(例如可从德国NanoresinsAG或EmeraldPerformanceMaterialsLLC以商品名(以前是)CTBN和CTBNX和ETBN商业获得)制备;以及二烯的氢化多羟基官能的聚合物或共聚物。
作为用于制备聚氨酯聚合物B2的多元醇的优选是聚氧亚烷基多元醇、聚酯多元醇、聚碳酸酯多元醇和聚丙烯酸酯多元醇。特别优选的是聚氧亚烷基多元醇,特别是聚氧亚丙基多元醇和聚氧亚乙基-聚氧亚丙基-混合多元醇。
优选地,用于制备聚氨酯聚合物B2的多元醇的平均分子量在500至20000g/mol,特别是1000至8000g/mol的范围内。
优选地,用于制备聚氨酯聚合物B2的多元醇优选是二元醇或由至少一种二元醇和至少一种三元醇组成的混合物,特别是由至少一种二元醇和至少一种三元醇组成的混合物。
特别地,下列商业可得的多异氰酸酯或者它们的混合物适合用作用于制备聚氨酯聚合物B2的多异氰酸酯:
2,4-和2,6-甲苯二异氰酸酯和这些异构体的任意混合物(TDI)、4,4'-,2,4'-和2,2'-二苯基甲烷二异氰酸酯和这些异构体的任意混合物(MDI)、1,3-和1,4-亚苯基二异氰酸酯、2,3,5,6-四甲基-1,4-二异氰酸基苯、萘-1,5-二异氰酸酯(NDI)、3,3'-二甲基-4,4'-二异氰酸基联苯(TODI)、1,3,5-三(异氰酸基甲基)苯、2-甲基五亚甲基-1,5-二异氰酸酯、1,6-六亚甲基二异氰酸酯(HDI)、2,2,4-和2,4,4-三甲基-1,6-六亚甲基二异氰酸酯(TMDI)、1,10-十亚甲基二异氰酸酯、1,12-十二亚甲基二异氰酸酯、赖氨酸和赖氨酸酯二异氰酸酯、环己烷-1,3-和-1,4-二异氰酸酯、1-甲基-2,4-和-2,6-二异氰酸基环己烷和这些异构体的任意混合物(HTDI或H6TDI)、1-异氰酸基-3,3,5-三甲基-5-异氰酸基甲基-环己烷(=异佛尔酮二异氰酸酯或IPDI)、全氢-2,4'-和-4,4'-二苯基甲烷二异氰酸酯(HMDI或H12MDI)、1,4-二异氰酸基-2,2,6-三甲基环己烷(TMCDI)、1,3和1,4-双(异氰酸基甲基)环己烷、m-和p-苯二亚甲基二异氰酸酯(m-和p-XDI)以及m-和p-四甲基-1,3-和1,4-苯二亚甲基二异氰酸酯(m-和p-TMXDI)。优选是MDI、TDI、IPDI和HDI。特别优选是MDI。
最优选是4,4'-二苯基甲烷二异氰酸酯。
有利地,具有异氰酸酯基团的聚氨酯聚合物B2可以由4,4'-二苯基甲烷二异氰酸酯与至少一种多元醇的反应得到。由此,在粘合剂固化过程中得到特别有效的硬链段和由此获得特别高的强度。
优选地,多异氰酸酯B1和用于制备聚氨酯预聚物B2的多异氰酸酯是不同种类的多异氰酸酯。
特别优选地,多异氰酸酯B1是在室温下液态的MDI,用于制备聚氨酯聚合物B2的多异氰酸酯是4,4'-二苯基甲烷二异氰酸酯,其在室温下通常是固态的。因此,所述第二种组分在室温下是液态的,这实现了简单的加工,并且得到了特别好的机械性能。一种由多异氰酸酯B1和聚氨酯聚合物B2组成的已定义的混合物通过以下得到:在聚氨酯聚合物B2和多异氰酸酯B1混合之前,将聚氨酯聚合物B2事先单独制备。
由此优选在聚氨酯聚合物B2的制备过程中不存在多异氰酸酯B1。
优选地,多异氰酸酯B1和聚氨酯聚合物B2之间的重量比例为0.25至4,优选为0.25至2,特别优选为0.3至1.5,特别是0.4至1.0。此种多异氰酸酯组分K2可实现具有好的可加工性、高的强度和高的伸长性的粘合剂。
特别优选的聚氨酯粘合剂包含多异氰酸酯组分K2,其含有
–20至60重量%的至少一种多异氰酸酯B1,其中其优选是室温下液态形式的4,4'-、2,4'-或2,2'-二苯基甲烷二异氰酸酯,和以聚合的MDI或包含部分低聚体或衍生物的MDI形式的这些异构体(MDI)的任意混合物,和
–30至70重量%的至少一种具有异氰酸酯基团的聚氨酯聚合物B2,其中,其氨基甲酸酯基团和游离异氰酸酯基团优选来自4,4'-二苯基甲烷二异氰酸酯。
在此所述的重量百分比是基于所有多异氰酸酯组分K2计的。
此外,聚氨酯粘合剂作为多元醇组分K1的组成成分,还可以包含其他能与异氰酸酯基团反应的物质。特别地,多元醇组分K1可以包含之前所述的用于氨酯聚合物B2制备的至少一种多元醇和/或至少一种低分子量的二元或更多元醇。
此外,聚氨酯粘合剂也可以包含加速羟基基团和异氰酸酯基团反应的催化剂,特别是锡、锌和铋的有机金属催化剂,例如二月桂酸二丁基锡,或叔胺,脒或胍,例如1,4-二氮杂双环[2.2.2]辛烷(DABCO)或1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)。为了获得热活化,特别是叔胺、脒或胍可以与苯酚或羧酸,特别是酚类或其他芳基的羧酸可逆地形成在温度升高时会分解的盐。
此外,聚氨酯粘合剂可以包含其他为双组分聚氨酯化学领域专业人员所熟知的其他成分。这些成分可以只存在于一个组分中,或在两个组分中。特别地,作为此种额外的成分可以存在溶剂,增塑剂和/或增量剂,填料如特别是炭黑、白垩或层状硅酸盐,此外还有颜料,流变改进剂如特别是无定型二氧化硅、干燥剂如特别是沸石,增附剂如特别是三烷氧基硅烷,抗氧化、热、光和紫外辐射的稳定剂,阻燃物质,以及表面活性物质,特别是润湿剂。
有利地,多元醇组分K1和多异氰酸酯组分K2可以如此配制,使得它们的体积混合比在1:3至3:1范围内,特别是1:2至2:1。特别优选是在0.8:1.2范围内。
优选地,组分K1和K2之间的混合比如此确定,使得在混合的聚氨酯粘合剂中,异氰酸酯基团数量和对于异氰酸酯基团有反应性的基团(特别是OH和NH2基团的总和)的数量之间的比例,在固化之前大约在1.2至1的范围内,优选在1.15至1.05。
组分K1和K2是分开单独制备的,并且至少对多异氰酸酯组分K2来说在隔绝水分条件下制备。组分K1和K2通常分别在各自的容器中储存。聚氨酯粘合剂的其他成分可以作为多元醇组分K1或者是多异氰酸酯组分K2的成分存在,其中对于异氰酸酯基团有反应性的其他成分优选是多元醇组分K1的成分。储存每种组分用的合适的容器特别是桶、提桶、袋、筒、罐、料盒或管。组分K1和K2都是可稳定储存的,也就是说,它们在使用前的数月到一年甚至更长的时间里可以在它们各自的性能不会在与其使用相关范围的程度上发生改变的情况下保存。
在粘合剂使用之前,多元醇组分K1和多异氰酸酯组分K2是分别分开储存的并且直到使用时或使用之前很短时间才互相混合。有利地,它们存在于由两个互相分开的腔室组成的包装中。
另一方面,本发明包括由两个互相分开的腔室组成的包装,其分别含有聚氨酯粘合剂的多元醇组分K1和多异氰酸酯组分K2。
优选的此类包装一方面是并排的双料盒或同轴料盒,其中两个管状的腔室并列地或嵌套地布置,并且用活塞隔绝空气和水分密封。所述组分可以通过推进活塞而从料盒中挤出。管的与活塞相对的那侧会任选地通过适配头改装,使得腔室开口在开口区域经由分隔壁彼此直接相连。有利地,在腔室的出口区域装有螺纹,使得静态混合器或动态混合器可以被密封安装。此种包装对于少量应用是特别优选的,特别是在填充量不超过1升时。
对于大量应用,特别是对于工业生产中的应用,有利地将这两种组分在桶或提桶中灌装和储存。应用时,组分通过推动泵压出并通过管道计量加入如通常在工业生产中为双组分粘合剂使用的混合装置。
通常,混合通过静态混合器或借助动态混合器进行。混合时需要注意的是,多元醇组分K1和多异氰酸酯组分K2必须尽量均匀混合。如果这两种组分混合得很差,则会出现与有利混合比例的局部偏差,这会导致机械性能劣化。为了可以目视地控制混合质量,可能有利地是使得这两种组分有两种不同的颜色。充分混合的粘合剂具有一种均匀的混合颜色而没有可见的条纹或纹影时,存在良好的混合。
在多元醇组分K1和多异氰酸酯组分K2的异氰酸酯基团接触时,通过化学反应开始固化。在此过程中,多胺PA的氨基基团和三元醇A1、二元醇A2和二元醇A3的羟基基团,和可能存在的其他对于异氰酸酯基团有反应的物质,与存在的异氰酸酯基团反应。过量的异氰酸酯基团与存在的水分反应。此反应的结果是,聚氨酯粘合剂固化为固体材料。这个过程也被称为交联。
因此,本发明的另一个主题是经固化的聚氨酯粘合剂,其由如上文所述的聚氨酯粘合剂固化得到。
本发明的另一个方面涉及一种粘合第一基材和第二基材的方法,其包括以下步骤:
–混合前述的多元醇组分K1和多异氰酸酯组分K2,
–将经混合的聚氨酯粘合剂涂布到至少一个待粘合的基材表面,
–在开放时间内,将待粘合的基材接合,
–使聚氨酯粘合剂固化。
在此,这两种基材可以由同种或不同种材料组成。
在此粘合方法中,适合的基材特别是
–玻璃、玻璃陶瓷、玻璃矿物纤维垫;
–金属和合金,如铝、铁、钢和有色金属,以及表面精整的金属和合金,如镀锌或镀铬的金属;
–经涂覆和涂漆的基材,如粉末涂覆的金属或合金和涂漆的金属片;
–塑料,如聚氯乙烯(硬和软质PVC)、丙烯晴-丁二烯-苯乙烯二烯共聚物(ABS)、聚碳酸酯(PC)、聚酰胺(PA)、聚(甲基丙烯酸甲酯)(PMMA)、聚酯、环氧树脂(特别是基于环氧树脂的热固性塑料)、聚氨酯(PUR)、聚甲醛(POM)、聚烯烃(PO)、聚乙烯(PE)或聚丙烯(PP)、乙烯/丙烯共聚物(EPM)和乙烯/丙烯/二烯-三元共聚物(EPDM),其中塑料优选可以借助等离子体、电晕或火焰表面处理过;
–纤维增强的塑料,如碳纤维增强的塑料(CFK)、玻璃纤维增强的塑料(GFK)和片状模塑料(SMC);
–木材,与树脂结合的木质材料,所述树脂如苯酚树脂、三聚氰胺树脂或环氧树脂,树脂-织物复合材料和其它所谓的聚合物复合材料;以及
–混凝土,砂浆,石膏,砖和天然石材如花岗岩、石灰岩和砂岩或大理石。
本方法中,一个或两个基材优选是金属或玻璃陶瓷或玻璃或玻璃纤维增强的塑料或碳纤维增强的塑料或基于环氧树脂的热固性塑料。
在需要时,基材可以在施涂粘合剂之前进行预处理。特别地,此种预处理包括物理的和/或化学的清洁方法,以及施加增附剂、增附剂溶液或底胶。
此外可能有利的是,此方法在聚氨酯粘合剂固化步骤之后还包含其他步骤
–加热已固化的聚氨酯粘合剂以消除粘合。
有利地,加热在≥120℃、特别在140至200℃、特别优选在150至160℃的温度下进行,其时间为≥10分钟、特别是≥20分钟、特别优选是20至40分钟、最优选是20至40分钟。
特别地,加热通过红外加热器、暖风机、感应加热设备或在炉中进行。
加热导致已固化的粘合剂的破坏,至少是部分破坏。加热以后,通过将粘合的基材彼此脱离,或通过将粘合的基材与预先加热的已固化的聚氨酯粘合剂脱离就可以轻易地,通常采用很小的单位粘合面上的施加力如用小于2.0MPa、特别是用1.5至0.2MPa的力解除粘合。
这在修复粘合的工件时是特别有利的,因为由此通过加热已固化的聚氨酯粘合剂,可以容易地以可控的方式置换损坏的或错误粘合的基材。因此,例如对于其部件是使用根据本发明的粘合剂粘合的车辆,各个接合部件的粘结处可以以可控的方式加热,例如用热风机或红外灯加热,或存在金属基材时通过感应加热。如此,单个接合部件借助加热通过解除粘合而从车辆上移除,而不会损害其他接合部件的粘合。因为这可以不需施加很大的力,所以也就不会损坏其他成型部件。
因此在另一方面,本发明涉及一种经由通过使用120℃至200℃的温度10至50分钟、优选通过使用150℃至160℃的温度20至40分钟的可控粘合剂热退化和脱离前述的聚氨酯粘合剂而热感应脱胶的方法。
由所述的粘合方法形成其中粘合剂将两个基材互相连接起来的制品。
特别地,所述制品尤其是轻型建筑结构的夹层元件,建筑物例如桥梁,工业品或消费品,特别是窗户,风力发电装置的转子叶片或者是交通工具,特别是车辆,优选是汽车、客车、卡车、轨道车辆或船舶,以及飞机或直升机;或者这类物品的部件。
特别优选地,根据本发明的聚氨酯粘合剂用于粘合第一基材和第二基材,其中至少所述第一基材是玻璃纤维增强的塑料或碳纤维增强的塑料或基于环氧树脂的热固性塑料或玻璃矿物纤维垫。
特别地,此种粘合体是所谓的轻质结构车辆(也就是其车身至少部分是由玻璃纤维增强的塑料或碳纤维增强的塑料构成的车辆)的组成部分。在此,所述第二基材尤其可以是玻璃纤维增强的塑料、碳纤维增强的塑料、钢、用KTL处理的钢、铝或塑料。
此外,此种粘合体尤其是用于所谓的轻型建筑结构的夹层元件的组成部分,所述轻型建筑结构可以是可移动的或固定的。在此,第一基材特别是玻璃矿物纤维垫。
所述的聚氨酯粘合剂作为结构粘合剂具有非常好的性质。
在此,结构粘合剂被定义为一种粘合剂,其在已固化状态下形成粘合的结构部件的承载结构的一部分。因此,结构粘合剂是构造的一个重要连接部分,其中结构粘合剂连接了两个部件或基材。与此相应地,对其机械性能提出了很高的要求。
结构粘合剂的另一个重要特性是其良好的可加工性。在本文中,两种组分单独和在混合时都应该具有低粘度,以便于其可良好运送和混合,但之后很快立刻形成这样一种粘度,使得立即获得结构粘性的稳固的材料,从而可以尺寸稳定地涂覆高达10毫米或以上的层厚度。
使用所述的聚氨酯粘合剂,这些要求可以特别好地被满足。
实施例
使用的物质:
通过如下制备聚合物-1:将1300g聚氧亚丙基二醇(Bayer的4200N;OH值28.5mgKOH/g)、2600g聚氧亚丙基聚氧亚乙基三醇(Shell的MD34-02;OH值35.0mgKOH/g)、600g4,4'-亚甲基二苯基二异氰酸酯(Bayer的44MCL)和500g邻苯二甲酸二异癸酯按照已知的方法在80℃下反应生成NCO封端的、游离异氰酸酯基团含量为2.1重量%的聚氨酯聚合物。
制备聚氨酯粘合剂
对于每种粘合剂,将在表1中以多元醇组分K1的指示量(以重量份表示)示出的内含成分,通过真空溶解器在隔绝水分的情况下加工成一种均匀的糊料并保存。相似地,将在表1中列出的多异氰酸酯组分K2的内含成分进行加工和保存。接着,这两种组分以指示的混合比例K2/K1(以重量份,w/w表示)借助于(DAC150FV,Hauschild)在30秒内加工为均匀的糊料并且立即对其进行如下测试:
为了确定机械性质,将粘合剂按照ISO527,第2部分,1B制成哑铃形状,并且在25℃下储存和固化24小时,之后在80℃下储存和固化3小时。
在表2给出的温度(-35℃或23℃或85℃)下经过24小时的调节时间之后,如此制得的样品体的0.05至0.25%伸长范围下的弹性模量(“E-模量”)、抗拉强度和断裂伸长率按照ISO527在ZwickZ020拉伸测试机上,分别在表中给出的温度下,以50mm/分钟的测试速度进行测量。
为了测量拉伸剪切强度,制备各种不同的测试体,其中在每种情况下粘合剂都在混合时间结束后1分钟,以层厚度2mm涂覆在两个用异丙醇除去油脂的以KTL涂覆的钢片之间并且涂覆在15x45mm的重叠的粘合面上。在这些测试体上,按照DINEN1465测量拉伸剪切强度,其中在测量前将所述测试体在不同条件下储存:或者作为早期强度的度量在23℃下1小时或在23℃下3小时并在23℃下测量;或者为了测量完全固化状态下的拉伸剪切强度在23℃下12小时并接着在80℃下3小时和之后在-35℃或23℃或85℃下24小时,在-35℃或23℃或85℃下进行测量。在完全固化状态下的此种测量在表2中被标为“固化的”。其中,代号(af)、(cf)和(acf)分别表示断裂模式,其中“af”表示粘合断裂模式,“cf”表示内聚断裂模式,“acf”表示粘合和内聚混合断裂模式。
结果在表2中给出。
表1中的描述(A1+A3)/A2和A1/A3涉及存在的三元醇A1、二元醇A2和二元醇A3在各自粘合剂中的重量比例。
Rf.1是一个比较实施例,Z-1到Z-10是根据本发明的实施例。
表1
表2
在图1和2中示出的DMTA测量通过MettlerDMA/SDTA861e进行。此测量的条件是:在剪切中测量,激发频率为10Hz且加热速率为5K/min。作为测试体的是在标准气候(23℃,50%相对湿度)下已固化7天的膜的盘状试样(厚度2-3mm,直径10mm)。它们被冷却到-60℃,之后以5K/min的加热速率加热到200℃,并测量复数剪切模量G*[MPa]。
Claims (15)
1.聚氨酯粘合剂,其由多元醇组分K1和多异氰酸酯组分K2组成;其中
多元醇组分K1包含
–至少一种平均分子量在1000至10000g/mol范围的三元醇A1,
–至少一种拥有两个伯羟基基团并且分子量在60至150g/mol范围的二元醇A2,
–至少一种平均分子量在200至3000g/mol范围的二元醇A3,其是聚三亚甲基醚二醇或者聚四亚甲基醚二醇,和
–至少一种分子量在60至500g/mol范围的脂肪族多胺PA;并且
多异氰酸酯组分K2包含
–至少一种多异氰酸酯B1,和
–至少一种具有异氰酸酯基团的聚氨酯聚合物B2;
其中,三元醇A1、二元醇A2和二元醇A3以这样的量存在,即重量比例(A1+A3)/A2在范围2.5至20之间、优选在3至15之间、特别在4至10之间,并且重量比例A1/A3在范围2至100之间、优选在3至75之间、特别在4至50之间。
2.根据权利要求1所述的聚氨酯粘合剂,其特征在于,所述三元醇A1是聚醚三元醇。
3.根据前述权利要求任一项所述的聚氨酯粘合剂,其特征在于,所述三元醇A1有伯羟基。
4.根据前述权利要求任一项所述的聚氨酯粘合剂,其特征在于,所述三元醇A1的平均分子量在3000至8000g/mol范围内。
5.根据前述权利要求任一项所述的聚氨酯粘合剂,其特征在于,所述二元醇A3是聚三亚甲基醚二醇。
6.根据前述权利要求1至4任一项所述的聚氨酯粘合剂,其特征在于,所述二元醇A3是聚四亚甲基醚二醇。
7.根据前述权利要求任一项所述的聚氨酯粘合剂,其特征在于,所述多胺PA选自:1,5-二氨基-2-甲基戊烷、2,2,4-和2,4,4-三甲基六亚甲基二胺、1,8-辛二胺、1,10-癸二胺、1,12-十二烷二胺、1-氨基-3-氨基甲基-3,5,5-三甲基环己烷、2-和4-甲基-1,3-二氨基环己烷和它们的混合物、1,3-双(氨基甲基)环己烷、1,4-双(氨基甲基)环己烷、2,5(2,6)-双(氨基甲基)-双环[2.2.1]庚烷、3(4),8(9)-双(氨基甲基)-三环[5.2.1.02,6]癸烷、双(2-氨基甲基)醚、3,6-二氧杂辛烷-1,8-二胺、4,7-二氧杂癸烷-1,10-二胺、4,7-二氧杂癸烷-2,9-二胺、4,9-二氧杂十二烷-1,12-二胺、5,8-二氧杂十二烷-3,10-二胺、1,3-双(氨基甲基)苯和1,4-双(氨基甲基)苯。
8.根据前述权利要求任一项所述的聚氨酯粘合剂,其特征在于,所述多异氰酸酯B1是在室温下液态的4,4'-,2,4'-或2,2'-二苯基甲烷二异氰酸酯,以及以聚合MDI或包含部分低聚体或衍生物的MDI形式的这些异构体(MDI)的任意混合物。
9.根据前述权利要求任一项所述的聚氨酯粘合剂,其特征在于,所述具有异氰酸酯基团的聚氨酯聚合物B2由4,4'-二苯基甲烷二异氰酸酯与至少一种多元醇的反应得到。
10.根据前述权利要求任一项所述的聚氨酯粘合剂,其特征在于,所述多元醇组分K1和所述多异氰酸酯组分K2之间的体积计的混合比例在1:3至3:1,优选0.8:1.2的范围内。
11.粘合第一基材和第二基材的方法,其包括以下步骤:
–混合根据权利要求1至10任一项所述的聚氨酯粘合剂的多元醇组分K1和多异氰酸酯组分K2,
–将经混合的聚氨酯粘合剂施涂到至少一个待粘合的基材表面上,
–将待粘合的基材在开放时间内接合,
–使聚氨酯粘合剂固化。
12.根据权利要求11所述的方法,其特征在于,一种或两种基材是金属或玻璃陶瓷或玻璃或玻璃纤维增强的塑料或碳纤维增强的塑料或基于环氧树脂的热固性塑料。
13.由根据权利要求11或12任一项所述的方法形成的物品。
14.经由通过使用120℃至200℃的温度10至50分钟、优选通过使用150至160℃的温度20至40分钟的热退化和脱离根据权利要求1至10任一项所述的聚氨酯粘合剂而热感应脱胶的方法。
15.根据权利要求1至10任一项所述的聚氨酯粘合剂的用途,用于粘合第一基材和第二基材,其中至少所述第一基材是玻璃纤维增强的塑料或碳纤维增强的塑料或基于环氧树脂的热固性塑料或玻璃矿物纤维垫。
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