CN107406724A - 用粘合剂粘合基材的方法 - Google Patents
用粘合剂粘合基材的方法 Download PDFInfo
- Publication number
- CN107406724A CN107406724A CN201680019947.4A CN201680019947A CN107406724A CN 107406724 A CN107406724 A CN 107406724A CN 201680019947 A CN201680019947 A CN 201680019947A CN 107406724 A CN107406724 A CN 107406724A
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- China
- Prior art keywords
- component
- adhesive
- isocyanate
- adhesive component
- acid
- Prior art date
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- 238000007725 thermal activation Methods 0.000 claims description 12
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Classifications
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C09J5/04—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving separate application of adhesive ingredients to the different surfaces to be joined
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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Abstract
本发明涉及用于粘合基材的方法,包括以下步骤:·I)(a)将至少一种粘合剂组分(a)和至少一种异氰酸酯组分(b)施加在至少两个基材之间;·II)将所述基材相对压制;其特征在于,在步骤I)中将粘合剂组分和异氰酸酯组分单独地施用到基材上。本发明还涉及根据该方法获得的复合件。在一个优选的实施方案中,使用水性聚氨酯分散体或在有机溶剂中的聚氨酯溶液作为粘合剂组分。
Description
本发明涉及用粘合剂组分和异氰酸酯组分粘合基材的方法。本发明还涉及根据该方法可以获得的复合件。
粘合剂通常是溶解的热塑性聚合物,其被施加到第一基材上并且在干燥之后直接或者在热活化后以粘性形式存在于该基材上。在与未涂布的或预先同样配备有粘合剂层的第二基材压制之后,将两个基材彼此结合。在一些经热活化的粘合剂的情况中,在冷却时开始结晶,这改善了粘合接缝的性能。
由于上述体系是热塑性聚合物,因此粘合接缝可以通过加热再次软化,并且可以将基材再次彼此分离。
粘合剂的热塑性性能在某些情况下导致问题。例如可能出现,基材的灵敏度不耐受特别高的活化温度,但在应用中出现高于粘合剂软化点的温度,这将会导致在应用期间基材的意外分离。
这里可示例性地提及鞋底的粘合。尤其在运动鞋的情况下,常常使用结晶的、脂族的聚氨酯分散体。活化温度通常为80℃。用这种粘合剂产生的粘合接缝因此随后具有约60℃的耐热性。然而,鞋业在这方面要求显著更高的耐热性,因为运动鞋更经常在60℃或更高的温度下在洗衣机中洗涤,并且应当避免鞋底分层。
可以例如通过使用双组分(2K)粘合剂来实现耐热性的提高。将2K粘合剂理解为是指其中组分(a)粘合剂组分和(b)交联剂组分由于其反应性而必须储存在分开的容器中的粘合剂。现有技术是将所述两种组分在施用之前不久混合,并立即开始相互反应,通常没有额外的活化。多异氰酸酯通常用作交联剂组分。EP 0 206 059 A中例如描述了这种体系和方法。
这种方法的缺点是:
•混合所需的耗费。
•在混合后,所述体系直接反应。这导致有限的加工时间和如果在受限制的加工时间内该混合物没有被使用,则会意味着产生额外的废料。
•在水性体系的情况下,由于粘度保持不变并且多异氰酸酯与水反应形成脲颗粒,因此有时不能观察到加工时间的过程。这可能导致耐热性没有如计划般增加。
•与混合材料接触的物品(如刷子)必须经常清洁并最终更换。
•混合物的反应性经常产生污染物质,特别是在非理想的工艺条件下,并堵塞施涂设备,特别是在使用辊、挤出机或喷头时,由此导致质量差的粘合剂施涂结果和提高的清洁耗费。
已经尝试通过以喷射混合各组分的方法来解决这些问题的至少一部分。然而,这些方法就其设备构造而言是如此复杂,以至于其仅适用于实验室规模。大工业的建立几乎不可能或者只有以非常大的耗费和高成本才可能,因为在环境条件和相对较长的距离下无法确保以喷射已经足以使各组分混合所需的精确条件。
因此,本发明的目的在于开发一种方法,借助该方法可以制造具有常规2K粘合剂的良好耐热性的粘合接缝,并且该方法不具有上述缺点。
根据本发明,通过粘合基材的方法实现了该目的,所述方法包括以下步骤:
I)将至少一种粘合剂组分(a)和至少一种异氰酸酯组分(b)施加在至少两个基材之间;
II)将所述基材相对压制;
其特征在于,在步骤I)中,将粘合剂组分(a)和异氰酸酯组分(b)分别地施用到基材上。
令人惊奇地已发现,可以如此分别施加2K粘合剂的组分,使得各组分在离开施用装置(例如辊,挤出机,喷枪,打印头,分配器)之后才接触基材,而相对于预混合的2K粘合剂没有由此显著不利地影响粘合剂功能。完全意外地,甚至可在完全干燥粘合剂组分(a)之后将异氰酸酯组分(b)施涂到该干燥的层上,而不会相对于预混合的例如由同样的组分构成的2K粘合剂由此显著不利地影响粘合剂功能。在本发明意义上,将干燥理解为是指除去挥发性成分和/或将粘合剂组分冷却至低于其凝固点(在热塑性塑料的情况下的熔点或玻璃点,任选在结晶之后)。如同在2K粘合剂的情况中惯常的那样,在施涂这两种组分之后,将两个基材压在一起(在可热活化的粘合剂的情况下,任选地在热活化之后)。根据本发明的方法得到一种粘合体系,其耐热性基本上相应于预混合体系(现有技术)的耐热性。
在本发明意义上,分别施用意味着,粘合剂组分和异氰酸酯组分在施用之前和施用期间都不彼此混合。各组分在基材上才彼此接触,并且在至少一个界面上进行接触。
作为粘合剂组分(a),可以考虑在2K方法中已知能与异氰酸酯反应的所有典型粘合剂或者能与异氰酸酯后交联的1-组分(1K)粘合剂。作为用于组分(a)的典型粘合剂原料可提及:聚乙酸乙烯酯、丙烯酸酯、聚氨酯、聚酯、聚醚、聚碳酸酯、聚氯丁烯、全氯异戊二烯和丁二烯,以熔体的形式、作为水性分散体、稀释在有机溶剂中、以及100%的液体体系及其典型混合物和常见制剂。所述粘合剂和制剂可以作为典型的熔体粘合剂(热熔体),永久粘合的压敏粘合剂(PSA),接触粘合剂,可热活化的粘合剂,液体反应性粘合剂,单面或双面地根据典型的应用方式来施加。优先使用基于聚氨酯的粘合剂组分。特别优选地,所述粘合剂组分(a)是2K粘合剂。
在本发明意义上的聚氨酯还包括具有氨基甲酸酯基团和脲基团的聚氨酯脲。
所述粘合剂组分(a)可以作为水性分散体、作为有机溶剂中的溶液或作为未稀释的液体体系存在。所述粘合剂组分优选以水性分散体或溶液的形式存在,特别优选是基于聚氨酯的水性分散体或溶液。特别优选使用水性粘合剂分散体,特别是基于聚氨酯的那些。
在本发明的一个优选实施方案中,使用可热活化的粘合剂作为粘合剂组分(a)。
特别优选涉及基于未稀释的聚氨酯、水性聚氨酯分散体或有机溶剂中的聚氨酯溶液的粘合剂,非常特别优选涉及水性聚氨酯分散体或有机溶剂中的聚氨酯溶液。
所述粘合剂优选包含聚氨酯,所述聚氨酯是以下组分的反应产物:
A1)异氰酸酯
A2)借助凝胶渗透色谱法在四氢呋喃中根据DIN 55672-1测定的数均分子量≥400 g/mol至≤8000 g/mol的聚合的多元醇,
A3)任选的分子量≤400 g/mol的一元醇和/或多元醇或单胺和/或多胺或氨基醇,
以及任选的至少一种选自下列的化合物
A4)具有至少一个离子基团或潜在离子基团的化合物
和
A5)非离子亲水化化合物。
潜在离子基团是例如通过中和而能够形成离子基团的基团。
特别优选的是包含聚氨酯(A)的水性聚氨酯分散体,所述聚氨酯(A)是以下组分的反应产物:
A1)异氰酸酯
A2)借助凝胶渗透色谱法在四氢呋喃中根据DIN 55672-1测定的数均分子量≥400 g/mol至≤8000 g/mol的聚合的多元醇,
A3)任选的分子量≤400 g/mol的一元醇和/或多元醇或单胺和/或多胺或氨基醇,
以及选自以下的至少一种化合物
A4)具有至少一个离子基团或潜在离子基团的化合物
和
A5)非离子亲水化化合物。
聚氨酯(A)优选由≥7重量%至≤45重量%的A1),≥50至≤91重量%的A2),≥0至≤15重量%的A5),≥0至≤12重量的离子化合物或潜在离子化合物A4)以及任选的≥0至≤30重量%的化合物A3)制备,其中A4)和A5)的总和为≥0.1至≤27重量%,并且这些组分的总和加起来为100重量%。
聚氨酯(A)特别优选由≥10重量%至≤35重量%的A1),≥55至≤90重量%的A2),≥0至≤10重量%的A5),≥1至≤9重量%的离子化合物或潜在离子化合物A4)以及任选的≥0至≤10重量%的化合物A3)构成,其中A4)和A5的总和为≥0.1至≤19重量%,并且这些组分的总和加起来为100重量%。
聚氨酯(A)非常特别优选由≥15至≤35重量%的A1),≥55至≤75重量%的A2),≥0至≤8重量%的A5),≥1至≤5重量%的离子化合物或潜在离子化合物A4)以及任选的≥0至≤8重量%的化合物A3)制成,其中A4)和A5的总和为≥0.1至≤10重量%,并且这些组分的总和加起来为100重量%。
合适的异氰酸酯(A1)是芳族,芳脂族,脂族或脂环族的异氰酸酯。也可以使用这些异氰酸酯的混合物。
所述异氰酸酯优选是每分子具有至少两个异氰酸酯基团的异氰酸酯,以下将其称为多异氰酸酯。
合适的多异氰酸酯的实例是亚丁基二异氰酸酯 (BDI),亚戊基二异氰酸酯(PDI),六亚甲基二异氰酸酯 (HDI),异佛尔酮二异氰酸酯 (IPDI),1,3-双(异氰酸根合甲基)苯 (1,3-苯二亚甲基二异氰酸酯,XDI),1,4-双(异氰酸根合甲基)苯 (1,4-苯二亚甲基二异氰酸酯,XDI),1,3-双(1-异氰酸根合-1-甲基乙基)苯 (TMXDI),1,4-双(1-异氰酸根合-1-甲基乙基)苯 (TMXDI),2,2,4-和/或2,4,4-三甲基六亚甲基二异氰酸酯,异构的双(4,4'-异氰酸根合环己基)甲烷异构体或者其任意异构体含量的混合物,异氰酸根合甲基-1,8-辛烷二异氰酸酯 (TIN),1,4-环亚己基二异氰酸酯,1,4-亚苯基二异氰酸酯,2,4-和/或2,6-甲亚苯基二异氰酸酯,1,5-亚萘基二异氰酸酯,2,4'-或4,4'-二苯基甲烷二异氰酸酯,三苯基甲烷-4,4',4''-三异氰酸酯或者它们具有氨基甲酸酯-、异氰脲酸酯-、脲基甲酸酯-、缩二脲-、脲二酮-、亚氨基噁二嗪二酮结构的衍生物和它们的混合物,如其例如描述在J. Prakt. Chem. 336 (1994) 185-200页。优选是仅具有脂族和/或脂环族键合的异氰酸酯基团的所述类型的多异氰酸酯或多异氰酸酯混合物。
特别优选的起始组分(A1)是基于PDI、HDI、IPDI和/或4,4'-二异氰酸根合二环己基甲烷,非常特别优选基于HDI和IPDI的多异氰酸酯或多异氰酸酯混合物。特别有利地,所述组分A1是HDI和IPDI的混合物。
合适的聚合的多元醇(A2)的OH官能度为≥ 1.5至≤ 4,例如聚丙烯酸酯、聚酯、聚内酯、聚醚、聚碳酸酯、聚酯碳酸酯、聚缩醛、聚烯烃和聚硅氧烷。优选的是平均分子量为≥400 g/mol至≤ 2500 g/mol且OH官能度为≥ 1.9至≤ 3的多元醇。特别优选的聚合的多元醇(A2)是聚酯、聚碳酸酯和/或聚醚,非常特别优选聚酯。
在本申请的范围内,数均分子量始终通过凝胶渗透色谱法 (GPC) 在四氢呋喃(THF) 中在23℃下来测定。其程序依据DIN 55672-1:“Gelpermeationschromatographie,第1部分 – Tetrahydrofuran als Elutionsmittel” (PSS Polymer Service的SECurityGPC系统,流速1.0 ml/min;柱:2×PSS SDV linear M, 8×300 mm, 5 µm;RID检测器)进行。使用已知摩尔质量的聚苯乙烯样品进行校对。数均分子量的计算借助软件支持进行。根据DIN 55672的第1部分确定基线点和评估极限。
可以考虑的具有羟基的聚碳酸酯可以通过碳酸衍生物,例如碳酸二苯酯、碳酸二甲酯或光气与二醇反应获得。合适的这类二醇例如包括乙二醇,1,2-和1,3-丙二醇,1,3-和1,4-丁二醇,1,6-己二醇,1,8-辛二醇,新戊二醇,1,4-双羟基甲基环己烷,2-甲基-1,3-丙二醇,2,2,4-三甲基戊烷-1,3-二醇,二丙二醇,聚丙二醇,二丁二醇,聚丁二醇,双酚 A,四溴双酚 A,和内酯改性的二醇。所述二醇组分优选包含≥ 40重量%至≤ 100重量%的己二醇,优选1,6-己二醇和/或己二醇衍生物,优选除了末端OH基团还具有醚基团或酯基团的那些,例如通过根据DE-A 1 770 245的1摩尔己二醇与至少1摩尔,优选1至2摩尔己内酯的反应或通过己二醇与其本身醚化成二-或三-己二醇而得的产物。这些衍生物的制备例如由DE-A 1 570 540已知。也可以使用在DE-A 3 717 060中描述的聚醚-聚碳酸酯二醇。
所述羟基聚碳酸酯应当优选是直链的。然而,它们可以任选地通过并入多官能组分,特别是低分子量多元醇而轻微支化。例如甘油、三羟甲基丙烷、1,2,6-己三醇、1,2,4-丁三醇、三羟甲基丙烷、季戊四醇、对环己二醇、甘露醇和山梨糖醇、甲基糖苷、1,3,4,6-二脱水己糖醇适用于此。
本身为聚氨酯化学中已知的、可例如经由通过阳离子开环的四氢呋喃的聚合制备的聚四亚甲基二醇聚醚适合作为聚醚多元醇。
此外,合适的聚醚多元醇(A2)是使用起始剂分子制备的环氧乙烷、环氧丙烷、环氧丁烷、氧化苯乙烯或表氯醇的加聚产物,以及它们的混合-和接枝加聚产物,以及通过多元醇或其混合物的缩合和通过水、多元醇、胺或氨基醇的烷氧基化而获得的聚醚。优选的是环氧乙烷和/或环氧丙烷的均-和/或混合加聚化合物。
环氧乙烷在环氧乙烷和/或环氧丙烷的均-和/或混合加聚化合物中的含量为0至100重量%,优选0至30重量%,特别优选0至10重量%。
聚酯多元醇例如是由二醇以及任选的三醇和四醇与二羧酸以及任选的三羧酸和四羧酸或者羟基羧酸或者内酯构成的本身已知的缩聚物。代替游离的多羧酸,也可以使用用于制备聚酯的相应的多羧酸酐或低级醇的相应的多羧酸酯。
对此合适的二醇的实例是乙二醇,丁二醇,二乙二醇,三乙二醇,聚烷二醇例如聚乙二醇,此外1,2-丙二醇,1,3-丙二醇,丁烷-1,3-二醇,丁烷-1,4-二醇,己烷-1,6-二醇和异构体,新戊二醇或羟基新戊酸新戊二醇酯。此外也可以使用多元醇如三羟甲基丙烷,甘油,赤藓醇,季戊四醇,三羟甲基苯或三羟基乙基异氰脲酸酯。
可以使用的二羧酸是邻苯二甲酸,间苯二甲酸,对苯二甲酸,四氢邻苯二甲酸,六氢邻苯二甲酸,环己烷二羧酸,己二酸,琥珀酸,壬二酸,癸二酸,戊二酸,四氯邻苯二甲酸,马来酸,富马酸,衣康酸,丙二酸,辛二酸,2-甲基琥珀酸,3,3-二乙基戊二酸和/或2,2-二甲基琥珀酸。作为酸源,也可以使用相应的酸酐。
如果待酯化的多元醇的平均官能度大于2,还可以另外同时使用单羧酸,例如苯甲酸和己烷羧酸。
在制备具有末端羟基的聚酯多元醇时作为反应参与物可以共同使用的羟基羧酸例如是羟基己酸,羟基丁酸,羟基癸酸,羟基硬脂酸等。合适的内酯是己内酯,丁内酯及同系物。优选己内酯。
优选的是基于己二酸和1,4-丁二醇和/或1,6-己二醇的聚酯多元醇。
组分(A3)适合用于聚氨酯-预聚物的扩链和/或终止。为此考虑单官能醇和单胺。优选的一元醇是具有1至18个碳原子的脂族一元醇,例如乙醇、正丁醇、乙二醇单丁醚、2-乙基己醇、1-辛醇、1-十二醇或1-十六醇。优选的单胺是脂族单胺,例如二乙胺、二丁胺、乙醇胺、N-甲基乙醇胺或N,N-二乙醇胺和Jeffamin® M系列的胺(Huntsman Corp. Europe, 比利时)或氨基官能的聚环氧乙烷和聚环氧丙烷。
相应文献中大量描述的具有小于400 g/mol的分子量的多元醇、氨基多元醇或多胺同样适合作为组分(A3)。
优选的组分(A3)例如是:
a) 烷二醇或-三醇如乙烷二醇,1,2-和1,3-丙二醇,1,4-和2,3-丁二醇,1,5-戊二醇,1,3-二甲基丙二醇,1,6-己二醇,新戊二醇,1,4-环己烷二甲醇,2-甲基-1,3-丙二醇,2-乙基-2-丁基丙二醇,三甲基戊二醇,位置异构的二乙基辛二醇,1,2-和1,4-环己二醇,氢化的双酚 A [2,2-双(4-羟基环己基)丙烷],2,2-二甲基-3-羟基丙酸-(2,2-二甲基-3-羟基丙基酯),三羟甲基乙烷,三羟甲基丙烷或甘油,
b) 醚二醇,如二亚乙基二乙二醇,三乙二醇,四乙二醇,二丙二醇,三丙二醇,1,3-丁二醇或氢醌二羟基乙基醚,
c) 通式(I)和(II)的酯二醇,
HO-(CH2)x-CO-O-(CH2)y-OH (I)
HO-(CH2)x-O-CO-R-CO-O(CH2)x OH (II)
其中
R是具有1至10个碳原子,优选2至6个碳原子的亚烷基或亚芳基,
x是2至6,和
y是3至5,
例如δ-羟基丁基-ε-羟基己酸酯,ω-羟基己基-γ-羟基丁酸酯,己二酸(β-羟基乙基)酯,和对苯二甲酸双(β-羟基乙基)酯,和
d) 二-和多胺例如1,2-二氨基乙烷,1,3-二氨基丙烷,1,6-二氨基己烷,1,3-和1,4-亚苯基二胺,4,4'-二苯基甲烷二胺,异佛尔酮二胺,2,2,4-和2,4,4-三甲基-六亚甲基二胺的异构体混合物,2-甲基五亚甲基二胺,二乙三胺,1,3-和1,4-苯二亚甲基二胺,α,α,α,α'-四甲基-1,3-和-1,4-苯二亚甲基二胺,4,4-二氨基二环己基甲烷,氨基官能的聚氧化乙烯或聚氧化丙烯(以商品名Jeffamin,D系列(来自Huntsman Corp. Europe, 比利时)可获得),二乙三胺和三乙四胺。在本发明意义上适合作为二胺的还有肼,肼水合物,和取代的肼,例如N-甲基肼,N,N'-二甲基肼及其同系物,以及酸二酰肼,己二酸,β-甲基己二酸,癸二酸,羟基丙酸和对苯二甲酸,脲氨基-亚烷基酰肼,例如β-脲氨基丙酰肼 (例如描述在DE-A 1 770591中),脲氨基亚烷基-卡巴肼酯(Carbazinester),例如2-脲氨基乙基-卡巴肼酯 (例如描述在DE-A 1 918 504中),或者氨基氨基脲化合物,例如β-氨基乙基脲氨基-碳酸酯 (例如描述在DE-A 1 902 931中)。
组分(A4)含有可以是阳离子、阴离子性质的离子基团。具有阳离子或阴离子分散作用的化合物是例如含有锍、铵、鏻、羧酸根、磺酸根、膦酸根或可通过成盐转化成上述基团(潜在离子基团)并可通过存在的异氰酸酯反应性基团引入到大分子中的基团的那些。合适的异氰酸酯反应性基团优选是羟基和胺基。
合适的离子或潜在离子化合物(A4)是例如单-和二羟基羧酸、单-和二氨基羧酸、单-和二羟基磺酸、单-和二氨基磺酸以及单-和二羟基膦酸或单-和二氨基膦酸和它们的盐,如二羟甲基丙酸、二羟甲基丁酸、羟基特戊酸、N-(2-氨基乙基)-β-丙氨酸、2-(2-氨基乙基氨基)乙磺酸、1,2-或1,3-丙二胺-β-乙基磺酸、乙二胺-丙基-或丁基磺酸、苹果酸、柠檬酸、羟基乙酸、乳酸、甘氨酸、丙氨酸、牛磺酸、赖氨酸、3,5-二氨基苯甲酸、IPDI和丙烯酸的加成产物(EP-A 0 916 647,实施例1)及其碱金属盐和/或铵盐;亚硫酸氢钠在2-丁烯-1,4-二醇上的加合物、聚醚磺酸酯,2-丁烯二醇和NaHSO3的丙氧基化加合物,例如DE-A 2 446440(第5-9页,式I-III)中描述的,以及可转化成阳离子基团的结构单元,如N-甲基二乙醇胺作为亲水性结构组分。优选的离子或潜在离子化合物是具有羧基或羧酸根和/或磺酸根和/或铵基的那些。特别优选的离子化合物是含有羧基和/或磺酸根作为离子或潜在离子基团的那些,如N-(2-氨基乙基)-β-丙氨酸的盐、2-(2-氨基乙基氨基)乙磺酸的盐或IPDI与丙烯酸的加成产物的盐(EP-A 0 916 647,实施例1)和二羟甲基丙酸的盐。非常特别优选的是N-(2-氨基乙基)-β-丙氨酸的钠盐和2-(2-氨基乙基氨基)乙磺酸的钠盐。同样非常特别优选的是二甲基丙酸。在一个有利的实施方案中,使用N-(2-氨基乙基)-β-丙氨酸或2-(2-氨基乙基氨基)乙磺酸的钠盐和二甲基丙酸。
起非离子亲水化作用的合适的化合物(A5)是例如含有至少一个羟基或氨基的聚氧化烯醚。此类聚醚含有30重量%至100重量%份额的衍生自环氧乙烷的结构单元。合适的是官能度为1至3的线性结构的聚醚以及通式(III)的化合物,
其中
R1和R2各自彼此独立地表示可以被氧和/或氮原子插入的具有1至18个碳原子的二价脂族、脂环族或芳族基团,且R3代表烷氧基封端的聚环氧乙烷基团。
起非离子亲水化作用的化合物例如还是按统计平均每分子具有≥ 5至≤70,优选≥ 7至≤55个环氧乙烷单元的一元聚环氧烷聚醚醇,如其可以以本身已知的方式通过合适的起始剂分子的烷氧基化获得的(例如在Ullmanns Encyclopädie der technischenChemie, 第4版, 第19卷, Verlag Chemie, Weinheim, 第31-38页中)。
合适的起始剂分子是例如饱和一元醇,如甲醇、乙醇、正丙醇、异丙醇、正丁醇、异丁醇、仲丁醇、戊醇的异构体、己醇、辛醇和壬醇、正癸醇、正十二烷醇、正十四烷醇、正十六烷醇、正十八烷醇、环己醇、甲基环己醇或羟甲基环己烷的异构体、3-乙基-3-羟甲基氧杂环丁烷或四氢糠醇、二乙二醇单烷基醚,例如二乙二醇单丁基醚,不饱和醇,如烯丙醇、1,1-二甲基烯丙醇或油醇,芳族醇,如酚,异构甲酚或甲氧基酚,芳脂族醇,如苄醇、茴香醇或肉桂醇,仲单胺,如二甲基胺、二乙基胺、二丙基胺、二异丙基胺、二丁基胺、双(2-乙基己基)胺、N-甲基-和N-乙基环己基胺或二环己基胺以及杂环仲胺,如吗啉、吡咯烷、哌啶或1H-吡唑。优选的起始剂分子是饱和一元醇。二乙二醇单丁基醚特别优选用作起始剂分子。
适合烷氧基化反应的环氧烷特别是环氧乙烷和环氧丙烷,它们可以以任意的顺序或以混合物的形式用于烷氧基化反应中。
该聚环氧烷聚醚醇是纯的聚环氧乙烷聚醚或混合的聚环氧烷聚醚,其环氧烷单元的至少30摩尔%,优选至少40摩尔%由环氧乙烷单元构成。优选的非离子化合物是具有至少40摩尔%环氧乙烷单元和最多60摩尔%环氧丙烷单元的单官能混合聚环氧烷聚醚。
为了制备聚氨酯 (A),可以使用离子(A4)和非离子(A5)的亲水化剂的组合。优选使用离子亲水化剂。
在本发明方法的一个特别优选的实施方案中,所述粘合剂包含含有聚氨酯 (A)的水性聚氨酯分散体,该聚氨酯 (A) 是如下物质的反应产物:HDI和IPDI的混合物 (A1),聚酯多元醇,特别是由己二酸和1,4-丁二醇和/或1,6-己二醇形成的聚酯多元醇 (A2),任选的二醇和/或二胺 (A3) 和2-(2-氨基乙基氨基)乙磺酸和/或二羟甲基丙酸的钠盐(A4)。
聚氨酯(A)的制备可以在均相中以一个或多个阶段,或者在多阶段反应的情况下部分在分散相中制备。在完全或部分进行的加聚反应后进行分散-、乳化-或溶解步骤。随后任选在分散相中进一步加聚或改性。
为了制备聚氨酯(A),可以使用由现有技术中已知的所有方法,如乳化剂-剪切力法、丙酮法、预聚物混合法、熔体乳化法、酮亚胺法和固体自发分散法或其衍生方法。这些方法的概述可见于Methoden der organischen Chemie(Houben-Weyl, 对第4版第E20卷的增补和追加卷,H. Bartl和J. Falbe, Stuttgart, New York, Thieme 1987, 第1671-1682页)。优选的是熔体乳化法、预聚物混合法和丙酮法。特别优选的是丙酮法。
通常,将所有或一部分不含伯或仲氨基的成分(A2)至(A5)和多异氰酸酯(A1)预先置于反应器中用于制备聚氨酯预聚物并任选用可与水混合但对异氰酸酯基团呈惰性的溶剂稀释,但优选不用溶剂,加热至较高的温度,优选在50至120℃的范围。
合适的溶剂是例如丙酮、丁酮、四氢呋喃、二氧杂环己烷、乙腈、二丙二醇二甲醚和1-甲基-2-吡咯烷酮,它们不仅可以在制备开始时添加,而且可任选地部分稍后添加。丙酮和丁酮是优选的。可以在常压或升高的压力下进行该反应,例如在溶剂例如丙酮的常压沸点温度以上。
此外,可以一起预先置入或稍后计量加入已知加速异氰酸酯加成反应的催化剂,例如三乙胺、1,4-二氮杂双环-[2,2,2]-辛烷、二丁基氧化锡、二辛酸锡、二月桂酸二丁基锡、双-(2-乙基己酸)锡、二辛酸锌、双-(2-乙基己酸)锌或其它有机金属化合物。
二月桂酸二丁基锡、二辛酸锌和双-(2-乙基己酸)锌是优选的,双-(2-乙基己酸)锌特别优选。
随后,将计量加入任选在反应开始时还未添加的成分(A1)、(A2)、任选的不具有伯或仲氨基的(A3)和(A4)和/或(A5),并且同样加热至较高的温度,优选在50至120℃的范围。在制备聚氨酯预聚物时,异氰酸酯基团与异氰酸酯反应性基团的物质的量的比例为≥0.90至≤3,优选≥0.95至≤2.5,特别优选≥1.05至≤2.0。基于不具有伯或仲氨基的(A2)至(A5)部分的异氰酸酯反应性基团的总量计,组分(A1)至(A5)的反应部分或完全地,但优选完全地进行。通常通过跟踪反应混合物的NCO含量来监测转化度。为此,可以对取出的样品进行光谱测量,例如红外-或近红外光谱、折光率测定和化学分析,如滴定。在本体中或在溶液中获得含有游离异氰酸酯基团的聚氨酯-预聚物。
在由(A1)和(A2)至(A5)制备聚氨酯预聚物之后或期间,进行起分散阴离子和/或阳离子作用的基团的部分或完全成盐,如果这尚未在起始分子中进行。在阴离子基团的情况中,为此使用碱,如氨、碳酸铵或碳酸氢铵、三甲胺、三乙胺、三丁胺、二异丙基乙胺、二甲基乙醇胺、二乙基乙醇胺、三乙醇胺、氢氧化钾或碳酸钠,优选三乙胺、三乙醇胺、二甲基乙醇胺或二异丙基乙胺。碱的物质的量为阴离子基团的物质的量的50至120%,优选50至100%,特别优选60至90%。在阳离子基团的情况中,使用有机或无机酸。如果仅使用具有醚基团的非离子亲水化化合物(A5),则省略中和步骤。在分散水已含有中和剂时,中和也可以与分散同时进行。
可能的胺组分是(A2)、(A3)和(A4),任选仍然留有的异氰酸酯基团可以与它们反应。该扩链可以在分散之前、在分散期间在溶剂中或在分散后在水中进行。如果将胺组分用作(A4),则优选在分散前进行扩链。
胺组分(A3)或(A4)可以用有机溶剂和/或用水稀释,并且加入到反应混合物中。优选使用≥70重量%至≤95重量%的溶剂和/或水。如果存在多种胺组分,则所述反应可以以任意顺序相继进行或通过加入混合物同时进行。
为了制备聚氨酯分散体,将所述聚氨酯预聚物,任选在强烈剪切,例如强烈搅拌下或在使用喷嘴喷射分散器的情况下引入到分散水中,或者相反地将分散水搅拌到预聚物中。然后,如果尚未在该均相中进行,可通过任选存在的异氰酸酯基团与组分(A2)、(A3)的反应实现摩尔质量提高。所用多胺(A2)、(A3)的量取决于仍存在的未反应的异氰酸酯基团。优选异氰酸酯基团的物质的量的≥ 45至≤100%,特别优选≥ 50至≤75%与多胺(A2)、(A3)反应。
有机溶剂可以任选地通过蒸馏除去。分散体的固体含量≥10至70重量%,优选≥25至65重量%,特别优选≥30至60重量%。
该聚氨酯分散体可以单独使用或与已知粘合剂、助剂和添加物质,特别是光保护剂如UV吸收剂和空间位阻胺(HALS),还有抗氧化剂,填料和漆料助剂,例如抗沉降剂,消泡剂和/或润湿剂,流动剂、反应性稀释剂、增塑剂、催化剂、辅助溶剂和/或增稠剂和添加剂,例如分散体、颜料、染料或消光剂一起使用。特别地,与聚氨酯分散体或聚丙烯酸酯分散体(它们也可任选是羟基官能的)的组合也毫不费力地可行。这些添加剂可以在临加工前添加到PUR分散体中。但是,也可以在粘合剂或粘合剂-/交联剂混合物的分散之前或之中添加至少一部分添加剂。在本发明的一个可行实施方案中,粘合剂组分(a)还可以已经包含其它交联活性物质,例如碳二亚胺、氮丙啶或过氧化物,其在独立过程中可能导致粘合剂组分(a)的共交联。可以添加到各个组分和/或整个混合物中的这些物质的选择和计量是本领域技术人员已知的。
特别优选用作粘合剂组分(a)的是可热活化的水性聚氨酯分散体。
异氰酸酯组分(b)是任意的有机异氰酸酯,其具有脂族、脂环族、芳脂族和/或芳族键合的游离异氰酸酯基团,其在室温下为液体或为此目的用溶剂稀释。异氰酸酯成分(b)优选为低粘度的,其优选具有在23℃下5至15000,优选10至5000 mPas,特别优选100至2000mPas的粘度。
所有的粘度测量使用来自Anton Paar Germany GmbH(德国)的Physica MCR 51流变仪根据DIN EN ISO 3219进行。
异氰酸酯组分(b)优选是具有两个或更多个异氰酸酯基团的异氰酸酯或其混合物,下文称为多异氰酸酯。特别优选地,所述多异氰酸酯是(平均)NCO官能度为1.5至5.0,特别优选2.0至4.0的化合物。此外优选地,多异氰酸酯仅具有脂族和/或脂环族键合的异氰酸酯基团。
将脂族和脂环族键合的异氰酸酯基团理解为是指键合在脂族或脂环族烃基上的异氰酸酯基团。
作为具有脂族或脂环族键合的异氰酸酯基团的化合物,不仅可以使用含有异氰酸酯基团的单体化合物,而且可以使用这些单体化合物的聚合物变体,以及它们的混合物。
合适的具有脂族键合的异氰酸酯基团的单体化合物是任意的通过光气化或根据无光气的方法(例如通过氨基甲酸酯热裂解)获得的脂族多异氰酸酯。优选的多异氰酸酯是分子量范围为140至336 g/mol的那些,例如直链脂族的二异氰酸酯1,4-二异氰酸根合丁烷(BDI),1,5-戊烷二异氰酸酯 (PDI),1,6-二异氰酸根合己烷 (HDI),1,3-双(异氰酸根合甲基)苯 (1,3-苯二亚甲基二异氰酸酯,XDI),1,4-双(异氰酸根合甲基)苯 (1,4-苯二亚甲基二异氰酸酯,XDI),1,3-双(1-异氰酸根合-1-甲基乙基)苯 (TMXDI),1,4-双(1-异氰酸根合-1-甲基乙基)苯 (TMXDI),4-异氰酸根合甲基-l,8-辛烷二异氰酸酯 (三异氰酸根合壬烷 (TIN)),2-甲基-1,5-二异氰酸根合戊烷,1,5-二异氰酸根合-2,2-二甲基戊烷,2,2,4-和/或2,4,4-三甲基-1,6-二异氰酸根合己烷,1,10-二异氰酸根合癸烷,以及脂环族的二异氰酸酯1,3-和1,4-二异氰酸根合环己烷,1,4-二异氰酸根合-3,3,5-三甲基环己烷,1,3-二异氰酸根合-2(4)-甲基环己烷,1-异氰酸根合-3,3,5-三甲基-5-异氰酸根合甲基环己烷(异佛尔酮二异氰酸酯,IPDI),1-异氰酸根合-1-甲基-4(3)-异氰酸根合甲基环己烷,1,8-二异氰酸根合-p-薄荷烷,4,4'-二异氰酸根合-1,1'-双(环己基),4,4'-二异氰酸根合-3,3'-二甲基-1,1'-双(环己基),4,4'-二异氰酸根合-2,2',5,5'-四甲基-1,1'-双(环己基),4,4'-和/或2,4'-二异氰酸根合二环己基甲烷,4,4'-二异氰酸根合-3,3'-二甲基二环己基甲烷,4,4'-二异氰酸根合-3,3',5,5'-四甲基-二环己基甲烷,1,3-二异氰酸根合金刚烷和1,3-二甲基-5,7-二异氰酸根合金刚烷,或这些多异氰酸酯的任意混合物。
所述多异氰酸酯有利地是通过脂族多异氰酸酯的改性由至少两种具有脂族键合的异氰酸酯基团的单体化合物制备的具有脲二酮-、异氰脲酸酯-、脲基甲酸酯-、缩二脲-、亚氨基噁二嗪二酮和/或噁二嗪三酮结构的任意的多异氰酸酯。这种改性例如记载在J.Prakt. Chem. 336 (1994) 185-200中,在DE-A 1 670 666,EP-A 0 798 299和EP-A 0 649866中。同样合适的是含有酯基团的多异氰酸酯,如其例如描述在EP0412380中。用于制备所述变体的合适的单体起始化合物是所有上述的单体多异氰酸酯及其混合物。
在本发明范围内优选使用的组分 (b) 是HDI,IPDI,1,3-二异氰酸根合-2(4)-甲基环己烷,4,4'-和/或2,4'-二异氰酸根合二环己基甲烷,或它们具有脲二酮-、异氰脲酸酯-、脲基甲酸酯-、缩二脲和/或亚氨基噁二嗪二酮结构的变体,以及所述化合物的混合物。
特别优选地,异氰酸酯组分 (b) 包含HDI或具有脲二酮-、异氰脲酸酯-、脲基甲酸酯-、缩二脲和/或亚氨基噁二嗪二酮结构的HDI变体,或者由其组成。非常特别地,异氰酸酯组分 (b) 包含具有脲二酮-、异氰脲酸酯-、脲基甲酸酯-、缩二脲和/或亚氨基噁二嗪二酮结构的HDI变体,或者由其组成。
含于异氰酸酯组分中的具有异氰酸酯基团的化合物的总和通常具有≥ 1.5,优选≥ 2,特别优选≥ 2.5和非常特别优选≥ 3.0的数均NCO官能度。
异氰酸酯组分 (b) 可以任选是亲水改性的。水溶性或可分散的多异氰酸酯例如通过用羧酸根-、磺酸根-和/或聚氧化乙烯基团和/或聚氧化乙烯/聚氧化丙烯基团的改性而获得。
所述多异氰酸酯的亲水化例如可通过与不足量的一元的亲水聚醚醇的反应而实现。这类亲水化多异氰酸酯的制备例如描述在EP-A 0 540 985,第3页第55行至第4页第5行中。非常合适的还有记载在EP-A-0 959 087,第3页第39-51行中的包含脲基甲酸酯基团的多异氰酸酯,其通过贫单体的多异氰酸酯与聚氧化乙烯聚醚醇在脲基甲酸酯化条件下的反应而制备。在DE-A 10 007 821,第2页第66行至第3页第5行中描述的可水分散的、基于三异氰酸根合壬烷的多异氰酸酯混合物也是合适的,以及用离子基团(磺酸根基团、膦酸根基团)亲水化的多异氰酸酯,它们例如描述在DE 10 024 624,第3页第13-33行或WO 01/88006中。同样可行的是通过添加乳化剂的外部亲水化。
例如在所谓的聚醚-脲基甲酸酯(借助聚醚亲水化)的情况下,所使用的多异氰酸酯组分 (b) 的NCO含量可以达到5-25重量%。在用磺酸基团亲水化的情况下,NCO含量可以达到4-26重量%,其中这些数值仅理解为示例性的。
所使用的异氰酸酯组分也可以部分地,例如直至存在的异氰酸酯基团的最多三分之一,用异氰酸酯反应性组分封端。在这种情况下,在稍后的步骤中可以发生封端的异氰酸酯组分与其它多元醇的反应,从而产生进一步的交联。
合适的多异氰酸酯封端剂例如是一元醇如甲醇,乙醇,丁醇,己醇,环己醇,苯甲基醇,肟如丙酮肟、甲基乙基酮肟,环己酮肟,内酰胺如ε-己内酰胺,酚,胺如二异丙基胺或二丁基胺,二甲基吡唑或三唑,以及丙二酸二甲酯,丙二酸二乙酯或丙二酸二丁酯。
优选的是使用低粘度的、疏水的或亲水化的多异氰酸酯,其具有基于脂族的、脂环族的、芳脂族的和/或芳族的异氰酸酯,特别优选脂族的或脂环族的异氰酸酯的游离异氰酸酯基团。
本发明的方法优选如下进行:
在至少两个基材之间施加至少一种粘合剂组分(a)和至少一种异氰酸酯组分(b)(步骤I),随后将具有一个或多个涂覆侧的经涂覆的基材任选在通过热作用活化粘合剂组分之后相对压合(步骤II)。仅当粘合剂组分在室温下不发粘时,粘合剂的热活化可能是必需的。例如,通过热活化可能导致熔融或解晶作用,或者通常将粘合剂组分的粘度降低,使得在压力作用下可以将待粘合的组分润湿并结合。对此典型的合适粘度是本领域技术人员所熟知的(例如参见E.P.Chang,J. Adhes. 34, 189 (1991)中提出的通过粘弹性窗口的PSA分类,所谓的Chang窗口)。
根据本发明的施用所述粘合剂组分和异氰酸酯组分的特征在于,不是如现有技术中常规的那样将这两种组分在施用之前或期间彼此混合,而是将它们彼此分开地施用。所述组分在此优选在基材上才彼此接触。这里,所述组分可以同时施用或在时间上彼此错开地施用。在此,不仅粘合剂组分(a)而且异氰酸酯组分(b)均可以作为第一组分施用到基材上。因此,相应随后施用另一个组分。
如果粘合剂组分(b)以溶液或分散体的形式存在,则在步骤II)之前必须从其中除去溶剂或分散介质,因此必须将其干燥。
在一个实施方案中,将粘合剂组分(a)和异氰酸酯组分(b)同时施用到基材上。
在另一个实施方案中,将粘合剂组分(a)和异氰酸酯组分(b)位置错开地施用到基材上。这意味着,这两种组分没有施涂在相同的位置上,但是在至少一个界面处接触。
在一个优选的实施方案中,将异氰酸酯组分单独地且随后地施用到已经施用的粘合剂组分上。在这种情况下,在施用异氰酸酯组分(b)时,先前施用的粘合剂组分(a)可能仍然是液体、已经部分干燥或甚至完全干燥并任选地结晶。
在一个特别优选的实施方案中,将异氰酸酯组分单独地且随后地施用到已经施用的、已经干燥并任选地结晶的粘合剂组分上。干燥在此意味着至少略为变干,但优选完全干燥。
这具有的优点是,例如,在可热活化的粘合剂的情况下,粘合剂层的施涂及其完全干燥可以在时间上如在空间上那样与异氰酸酯组分的施用完全分开。因此,涂覆有粘合剂组分的基材可以储存。
由于干燥的粘合剂组分(a)的特性类似于1K热熔体或干燥的1K溶剂粘合剂的特性,因此该方法适用于多种合适的、预施用的、原则上也可以与异氰酸酯共交联的1K粘合剂。
粘合剂组分(a)优选是可热活化的粘合剂,其在施用后干燥并热活化。在施用异氰酸酯组分(b)之后,通过在压力下压合呈粘合剂的热活化状态的两个基材进行粘合。
因此,在本发明方法的一个有利的实施方案中,在步骤II)之前热活化粘合剂组分(b)。
对于可热活化的粘合剂,粘合剂层的活化可以在施用异氰酸酯组分之前不久进行,或者在热活化之前施涂异氰酸酯组分,然后热活化整个体系。
在一个优选的实施方案中,将粘合剂组分施用到两个待结合的基材上。
在本发明的一个特别优选的实施方案中,在步骤I)中,首先将粘合剂组分施加到两个基材上,然后将异氰酸酯组分施加到至少一个基材上的粘合剂组分上。之后,可以在压力下压合基材。异氰酸酯组分(b)优选至少施加到粘合剂组分(a)的一部分上。异氰酸酯组分(b)优选施加到粘合剂组分(a)没有与基材接触的表面的至少5%,或优选至少10%,或优选至少20%上。可以在干燥粘合剂组分(a)之后直接施涂异氰酸酯组分,或者在干燥后几分钟、几小时、几天、几周、几月或甚至几年之后才施涂异氰酸酯组分。优选将异氰酸酯组分施加到仍然湿的粘合剂组分(a)上。
粘合剂组分(a)可以,优选地由分散体或溶液,作为层来施加。干燥后的该层的厚度优选为0.1至2000μm,更优选为1至300μm,特别优选为5至200μm。也可以施加多个层。在这种情况下,异氰酸酯组分可以施涂到所述层的一个或多个上。
在一个优选的实施方案中,在步骤I)之前的步骤0)中,此外将异氰酸酯组分(b)施加到两个基材中的至少一个的至少一部分上。
将粘合剂组分在整个平面或在部分区域中施加到异氰酸酯组分上和/或至少一个基材上。
将异氰酸酯组分同样地在整个平面或在部分区域中施加到粘合剂组分上和/或至少一个基材上。
在本发明方法的一个优选实施方案中,将异氰酸酯组分(b)在部分区域中施加到粘合剂组分(a)上。
在100重量份的粘合剂组分(a)(固体含量)上,优选使用≥0.5且≤30重量份的异氰酸酯组分(b)(固体含量),或优选≥1且≤15重量份的异氰酸酯组分(b),或优选≥1.5且≤10重量份的异氰酸酯组分(b)。
在本发明方法的一个优选实施方案中,在100重量份的粘合剂组分(a)(固体含量)上,使用≥0.1且≤30重量份的异氰酸酯组分(b)(固体含量),此外优选≥0.2且≤25重量份的异氰酸酯组分(b),或优选≥0.5且≤20重量份的异氰酸酯组分(b),或优选≥1.0且≤15重量份的异氰酸酯组分(b)。
粘合剂组分(a)和异氰酸酯组分(b)可以相同或不同地施涂。合适的施涂方法是用于液体材料的所有常见施涂方法。在此可示例性提及:喷涂,刮涂,刷涂,滚涂,流动涂布,辊涂,挤出,分配(Dispensen)和打印。
有利地,至少打印异氰酸酯组分(b)。由此可以将其位置精确地和目标定向地以任意图案施加在粘合剂组分上。
为粘合基材,将其在-20至180℃的温度下,用0.05至50巴的压力相对压合优选持续0.1至600秒,特别优选在10至150℃的温度下,用0.1至20巴的压力持续1至120秒,非常特别优选在20至120℃的温度下,用0.5至10巴的压力持续2至60秒。
本发明的方法适用于任意基材的粘合。例如适合纸,纸板,木材,金属,皮革,合成革,橡胶材料,任意的塑料,如尤其是聚氨酯基塑料及其泡沫材料,以及氯乙烯的均聚物或共聚物。所述基材还可以是纺织品或薄膜材料。
本发明的方法适用于例如通过粘合来生产鞋类、纺织复合品、家具、薄膜涂层和/或车辆内饰。
通过本发明的方法制备的粘合剂优选具有≥65℃,或优选≥85℃,和非常特别优选≥100℃的软化点。
通过本发明的方法制备的粘合剂优选具有比基于粘合剂组分a)的粘合剂的软化点高>3℃,或优选>5℃,或优选>10℃,或优选>15℃的软化点。
本发明的另一个主题是可通过本发明的方法获得的复合件。
在粘合两个基材的情况下根据本发明产生的复合件的特征在于,基材之间的粘合剂层至少逐段地具有含有聚氨酯-和/或聚氨酯聚脲的不同密度的网络。至少逐段地混有不同密度的含有聚脲-和/或聚氨酯聚脲的网络。
由此将所述复合件与根据现有技术中已知的方法可获得的复合件显著区分开。通过预混合各个组分,这些复合件跨整个粘合剂层具有均匀的、含有聚脲-和/或聚氨酯聚脲的网络。
在组分a)和组分b)的接触区域中的氨基甲酸酯基团和/或脲基团的浓度比在其余复合材料中高至少5重量%,优选至少7重量%,或优选至少10重量%。根据本发明,将接触区域理解为是指沿组分a)和组分b)的接触面至多5微米,优选至多1微米,或优选至多0.5微米的区域。在夹层结构(相继地施涂组分a)和组分b的多层))的情况下,相应地得到多个接触区域。
因此,本发明的另一个主题是包括至少两个基材的复合件,该至少两个基材通过设置在基材之间的粘合剂层结合,其特征在于,粘合剂层至少逐段地混有不同密度的聚异氰脲酸酯和/或聚脲-和/或聚氨酯网络。
关于粘合剂层的性质,上述对于粘合剂组分(a)给出的细节和有利的实施方案同样适用。
所述聚异氰脲酸酯和/或聚脲-和/或聚氨酯网络优选地通过粘合剂组分与异氰酸酯组分(b)的反应而产生,对此同样类似地适用上述细节和有利的实施方案。
优选地,本发明的复合件的特征在于,所述粘合剂层基于可热活化的粘合剂组分。
此外优选的是,本发明的复合件的特征在于,所述粘合剂层基于为水性聚氨酯分散体的粘合剂组分。
本发明的复合件的粘合剂层优选具有≥65℃,或优选≥85℃和非常特别优选≥100℃的软化点。
本发明的复合件的粘合剂层的软化点优选比基于由粘合剂组分a)组成的粘合剂层的粘合剂层的软化点高>3℃,或优选>5℃,或优选>10℃,或优选>15℃。合适的基材例如是纸,纸板,木材,金属,皮革,合成革,橡胶材料,任意的塑料,如尤其是聚氨酯基塑料及其泡沫材料,以及氯乙烯的均聚物或共聚物。所述基材还可以是纺织材料和/或薄膜材料。
本发明的复合件例如是鞋类、纺织复合品、家具、薄膜涂层和/或车辆内饰。
实施例:
方法和使用的材料:
软化点测定:将试样悬挂在烘箱中,负荷有4kg的重量,烘箱加热至40℃。在40℃下停留20分钟后,烘箱以0.5℃/分钟的加热速率进行加热。粘合剂结合分离开的温度是软化点。
Desmodur® N3600 无溶剂聚异氰脲酸酯,基于Bayer MaterialScience AG的HDI;
Desmodur® DN 无溶剂的、亲水改性的脂族多异氰酸酯,基于Bayer MaterialScienceAG,Leverkusen的HDI;
Dispercoll® U 54 来自Bayer MaterialScience AG,Leverkusen的水性聚氨酯分散体;固体含量50重量%;由基于聚酯多元醇的线性聚氨酯链构成的异氰酸酯反应性聚合物,具有HDI/IPDI作为异氰酸酯组分;
Dispercoll® U XP 2643 来自Bayer MaterialScience AG,Leverkusen的高分子量非结晶聚氨酯的水性阴离子亲水改性分散体;
Desmocoll® 540/5 来自Bayer MaterialScience AG,Leverkusen的很大程度线性的、高度结晶的弹性羟基聚氨酯,作为在2-丁酮(来自Deutsche Shell GmbH的2-丁酮)中的15%的溶液来使用;
乙酸丁酯(BA) 来自Azelis,Antwerpen的乙酸丁酯98/100。
除非另有说明,所述原料不经进一步纯化或预处理来使用。
Borchi® Gel L 75 N(Borchigel增稠剂) 来自Borchers GmbH,德国的聚氨酯基增稠剂。
操作程序:
在两个用异丙醇清洁过的PVC条(宽度20mm,长度50mm,高度4mm)上,分别在2cm宽的条的1cm上借助刷子施涂大约200μm厚的粘合剂分散体的层、粘合剂分散体与各自的多异氰酸酯的混合物的层、粘合剂溶液的层或粘合剂溶液与各自的多异氰酸酯的混合物的层。将各个组分的混合物在使用前混合并在其适用时间内加工(2-组分粘合剂混合物的适用时间定义为直至混合物粘度加倍的时间或导致粘合剂初始强度降低> 50%的预反应的时间)。
在单独施涂异氰酸酯组分的情况下,借助数字打印机(Dimatix DMP 2831,打印头DMC-11610(16个喷嘴和10pl的标称液滴尺寸))施涂到事先完全干燥的粘合剂层上,或者直接在其施涂后湿的粘合剂层上。除非在表中另有说明,否则在室温下干燥1小时。随后使用IR灯(冲击活化装置Funck A 2000)热活化结晶的粘合剂层(10秒=>粘合剂温度约90℃)。在含有溶剂的无定形体系的情况下,其在室温下已经发粘,则不进行热活化。将提供的PVC条(试样)通过粘合剂面叠加放置,使得未处理的端部在一条线上彼此远离。随后将试样用压机在4巴下压合1分钟(除非在表1中另有说明)。将制造的试样在室内条件(Raumbedingung)下储存3天,然后进行软化点测量。结果列于表1中。
显而易见的是,通过本发明的方法,可以实现具有与预混合的2K粘合剂体系相同水平或稍微略低水平的软化点的粘合剂。
表1:
在根据本发明施加的由粘合剂组分(a)和异氰酸酯组分(b)组成的粘合剂层的情况下可发现软化点未预料到地明显升高,正如相比于由粘合剂组分(a)和异氰酸酯组分(b)组成的预混合的粘合剂混合物可以明显看出的。在每100份粘合剂组分(a)使用多于0.2份至小于0.5份的异氰酸酯组分(b)的情况下,与预混合的2K粘合剂混合物的软化点相比,软化点已经可以提高多于20℃。
Claims (17)
1.用于粘合基材的方法,包括以下步骤:
I)将至少一种粘合剂组分(a)和至少一种异氰酸酯组分(b)施加在至少两个基材之间;
II)将所述基材相对压制;
其特征在于,在步骤I)中将粘合剂组分和异氰酸酯组分分别地施用到基材上。
2.根据权利要求1所述的方法,其特征在于,将粘合剂组分(a)和异氰酸酯组分(b)在时间上错开地施加。
3.根据权利要求2所述的方法,其特征在于,将异氰酸酯组分(b)单独地和随后地施加在已经施用的粘合剂组分(a)上。
4.根据权利要求3所述的方法,其特征在于,在施加异氰酸酯组分(b)之前,将所施用的粘合剂组分(a)干燥和任选地结晶。
5.根据权利要求1至4中任一项所述的方法,其特征在于,在步骤II)之前,将粘合剂组分(b)热活化。
6.根据权利要求2至5中任一项所述的方法,其特征在于,在步骤I)中,首先将粘合剂组分(a)施加到两个基材上,然后至少在一个基材上,将异氰酸酯组分(b)施加到粘合剂组分(a)上。
7.根据权利要求1至6中任一项所述的方法,其特征在于,将所述异氰酸酯组分(b)在部分区域中施加在粘合剂组分(a)上。
8.根据权利要求1至7中任一项所述的方法,其特征在于,所述粘合剂组分(a)基于聚氨酯。
9.根据权利要求1至8中任一项所述的方法,其特征在于,所述粘合剂组分(a)包含水性聚氨酯分散体或在有机溶剂中的聚氨酯溶液,或者由其组成。
10.根据权利要求1至9中任一项所述的方法,其特征在于,所述异氰酸酯组分(b)仅具有脂族和/或脂环族键合的异氰酸酯基团。
11.根据权利要求1至10中任一项所述的方法,其特征在于,所述异氰酸酯组分(b)包含HDI或HDI的变体,或者由其组成,所述HDI的变体具有脲二酮结构、异氰脲酸酯结构、脲基甲酸酯结构、缩二脲结构和/或亚氨基噁二嗪二酮结构。
12.根据权利要求1至11中任一项所述的方法,其特征在于,每100重量份的粘合剂组分(a)(固体含量)使用≥0.5和≤30重量份的异氰酸酯组分(b)(固体含量)。
13.根据权利要求1至11中任一项所述的方法,其特征在于,每100重量份的粘合剂组分(a)(固体含量)使用≥0.1和≤30重量份的异氰酸酯组分(b)(固体含量)。
14.通过根据权利要求1至13中任一项所述的方法获得的复合件。
15.复合件,其包括至少两个通过设置在基材之间的粘合剂层结合的基材,其特征在于,所述粘合剂层至少逐段地混有不同密度的聚异氰脲酸酯和/或聚脲-和/或聚氨酯-网络。
16.根据权利要求15所述的复合件,其特征在于,所述粘合剂层基于可热活化的粘合剂组分。
17.根据权利要求15或16所述的复合件,其特征在于,所述粘合剂层基于粘合剂组分,所述粘合剂组分基于聚氨酯。
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