Reactive Hot Melts on the Basis of Polyester and Polyamide

Hot melts show many advantages over other adhesives, for instance, their lack of solvent and their very short setting time just by cooling. The weak point of hot melts in comparison to thermosetting resins is their limited thermal resistance. There is no doubt that the high performance hot melts on the basis of polyester and polyamide show a better heat performance than the widely-used rubbery hot melts. Nevertheless, it is true that the thermal resistance is limited by the melting point of the hot melt. To improve the heat performance, without losing the favourable hot melt properties, crosslinkable hot melts have been created. For the example, copolyamide/blocked isocyanate blends, it can be shown that crosslinkable hot melts are achievable in a wide range of reactivities. After curing, which takes place during the bonding process, these hot melts withstand temperatures of over 220°C even if the melting point of the initial hot melt was 100°C.     

阻燃EVA热熔胶的研制

对无机阻燃剂进行表面改性,从而提高其与高分子聚合物的相容性和分散性。将改性后的阻燃剂填充到EVA体系中,通过对阻燃性能和机械性能的测定,进而得到了最适宜阻燃剂和填充量。通过对EVA热熔胶中其它组分的考察,得到了环保型阻燃EVA热熔胶的最适宜配比。结果表明：复配型阻燃剂为最适宜阻燃剂,加入量为5％(质量分数,下同);当E...     

聚酰胺热熔胶抗氧化研究

系统研究了各种抗氧剂及一些抗氧剂复合配方体系对聚酰胺热熔胶热氧化的稳定作用，所用抗氧剂包括受阻酚、芳香胺、铜盐、亚磷酸酯等。实验结果表明，在聚酰胺热熔胶的热氧化过程中，单独使用一种抗氧剂的抗氧效果不显著，而使用主抗氧剂与辅助抗氧剂的复合体系有比较显著的抗氧作用。各种黏度的聚酰胺热熔胶的耐热氧化稳定性不相同，黏度小的聚酰胺热熔胶的耐热氧化性能比黏度大的好。     

聚合物熔体的介电性能研究

研究了聚碳酸酯（PC）、低密度聚乙烯（LDPE）两种聚合物熔体的介电性能。结果表明, PC熔体在220~320 ℃范围内,PE-LD熔体在120~300 ℃温度范围内,两种聚合物熔体的介电常数在低频时随频率的增加而显著减小;频率为10 Hz时,PC熔体的介电常数在220~320 ℃范围内随温度的升高而增大,介电常数变化较大,而频率为100~1 000 Hz时,PC熔体的介电常数在此温度范围内随温度的升高变化较小;频率为10 Hz时,PE-LD熔体的介电常数在120~300 ℃范围内随温度的升高表现出先增大后减小,再增大的复杂关系,频率为1 000 Hz时,PE-LD熔体的介电常数受温度的影响较小。     

浅析水质对服装粘合衬用热熔胶浆性能的影响

本文就水中杂质(碳酸盐、硫酸盐、氯化物等)对服装粘合衬布用热熔胶浆的性能(包括:粘合性能、耐洗性能、热性能、粉体性能、抗老化性能等)的影响程度进行了分析和讨论     

国外湿固化聚氨酯热熔胶技术进展

叙述了湿固化聚氨酯热熔胶的主要特点和用途。通过大量专利文献的查阅,从预聚体、热塑性树脂、增粘剂、添加剂等几个方面论述了湿固化聚氨酯热熔胶的组成及国外在这些方面改进胶性能的技术进展。由文献得知,增加聚氨酸预聚体和热塑性树脂的结晶度,能提高该热熔胶的初粘力,带有羟基的热塑性树脂与低聚物多元醇一起与多异氰酸酯反应,可制得优质热熔胶。     

用于钢塑复合管热熔胶的PE接枝母料的制备

研究和制备了一种用于钢塑复合管热熔胶的PE接枝母料。结果表明:LLDPE接枝母料复配热熔胶的黏结力最强;马来酸酐(MAH)和过氧化二异丙苯(DCP)的最佳用量分别为1.5和0.08 phr;通过引入共聚单体苯乙烯(St)能进一步提高PE接枝母料的接枝率,从而提高PE接枝母料复配热熔胶的黏结力;PE接枝母料的最佳配比为LLDPE:DCP:MAH:St=100:0.08:1.5:2.1。     

湿固化聚氨酯热熔胶的研究近况及展望

叙述了湿固化聚氨酯热熔胶的特点、应用,重点介绍了它的主要组成及性能和近年来湿固化聚氨酯热熔胶的研究成果,并展望了其发展趋势。     

电子行业用聚酯热熔胶的制备及其性能研究

以玻璃化转变温度较低的共聚酯制备了聚酯热熔胶。研究结果表明:聚酯热熔胶对丙烯腈-丁二烯-苯乙烯共聚物(ABS)、聚碳酸酯(PC)等极性塑料与金属材料具有良好的粘接性能,稳定后的剥离强度大于100N/25mm;同时,具有良好的耐老化性能及粘接持久性。聚酯热熔胶可取代国外产品用于电子行业用极性聚合物与金属材料粘接。     

我国湿固化聚氨酯热熔胶的研究现状和趋势

对聚氨酯热熔胶的分类和湿固化聚氨酯热熔胶的定义做了简明的阐述。分别从合成方法、改性和应用等方面对国内湿固化聚氨酯热熔胶的研究现状进行了综述。最后,对我国湿固化聚氨酯热熔胶的研究趋势进行了展望。     

Hot melt extrusion for pressure sensitive tapes: A European viewpoint

The state-of-the-art in slot extrusion-type hot melt coaters is reviewed. Case histories on several European pressure sensitive tape installations are given. These include specifications on jobs being produced, with an emphasis on handling films and on the type of adhesives being used, including electron-beam cured adhesives. Economic justification of pressure sensitive hot melts vs solvents and emulsions plus recommendations for equipment configurations are also given.     

聚苯乙烯熔体挤出流动特性的研究

应用毛细管流变仪,考察了两种聚苯乙烯-Styron498(PS498)和Styron492J(PS492J)熔体挤出过程中的流动行为及其影响因素。实验发现,两试样熔体的流动均不严格地服从幂律;在相同条件下,PS492J的非牛顿性较PS498明显;两试样熔体的粘度对温度的依赖关系符合Arrhenius方程。本文还就熔体流变行为与分子结构参数的关系进行了初步定量分析。     

单组分湿固化聚氨酯热熔胶黏剂的研制

以多元醇和异氰酸酯为主要原料合成不同-NCO含量的单组分湿固化聚氨酯热熔胶黏剂。阐述了固化机理,讨论了软段结构、-NCO含量、固化时间和其它填料对其性能的影响。结果表明,以自制的多元醇,设定-NCO质量分数为3．0％左右时,添加适量的EVA和萜烯树脂改性,其性能较好,固化时间为24h,拉伸强度达到9．5MPa,初黏强度达到0．38MPa,剪切强度达到8．4MPa。     

压敏胶粘剂的技术发展

对水基（ 丙烯酸酯乳液） 、热熔型和射线固化型３ 类环境友善的压敏胶粘剂近几年国内外的主要技术发展进行了介绍和评述。     

人造板封边用EVA热熔胶研制

介绍了有较好耐热性和耐湿性的人造板封边用EVA型热熔胶的制备方法。     

Hot melt adhesive properties of PA/TPU blends compatibilized by EVA-g-MAH

A new copolyamide (PA52) with good adhesion to aluminum (Al) sheets was synthesized from caprolactam, nylon 66 salt, nylon 1010 salt, and stearic acid, and a series of PA52/TPU blends compatibilized by maleic anhydride-grafted ethylene vinyl acetate (EVA-g-MAH) were prepared for use as hot melt adhesives. In the ternary blends (PA52/EVA-g-MAH/TPU), the weight ratio of PA52 to TPU was kept constant at 50/50 and the amount of EVA-g-MAH was varied at 0, 2, 4, 6, and 8 wt% over the total weight of the blend, respectively. The solubility parameters were taken into account to describe the partial compatibility of PA52/TPU blends. The effects of EVA-g-MAH content on the melt viscosity, morphology, mechanical and thermal properties of ternary blends were systematically investigated, and the adhesion strength of hot melt adhesives based on the ternary blends were determined in terms of 90° peeling strength tests of Al/adhesive/ABS stacks. The results showed that the melt viscosity of ternary blends were greater than that of PA52/TPU blend, and the blend containing 6 wt% EVA-g-MAH exhibited an optimal miscibility behavior and excellent mechanical properties, at the same time, its peeling strength reached the maximum (120 N/25 mm).     

反应型聚氨酯热熔胶粘剂的研制

以聚己二酸己二醇酯二醇(PHA)和聚醚多元醇(PPG)为软段,4,4’-二苯基甲烷二异氰酸酯(MDI)为硬段,制备了一系列聚酯／聚醚不同配比的反应型聚氨酯热熔胶。考察了各因素对反应型聚氨酯热熔胶粘接强度、固化速度等性能的影响。     

用SIS及SBS制备热熔压敏胶的工艺研究

本文探讨了用SIS和SBS制备热熔压敏胶的工艺条件及最佳组成问题,实验表明,当SBS与SIS用量为1：1时,其产品性能与SIS热坟敏胶性能相当,选用R100或聚萜烯树脂作为增粘剂,产品的粘接力较大,增塑剂的用量及材料的组成对产品的性能也有一定的影响。     

高耐温性钢塑管材用热熔胶黏剂的制备及性能研究

以神华均聚聚丙烯（PP）为基体树脂,通过与聚烯烃弹性体（POE）共混反应挤出制备了高耐温性钢塑管材用热熔胶黏剂。研究了引发剂含量、接枝单体含量和PP/POE配比对热熔胶性能的影响,考察了自制热熔胶在实际应用中的耐温性能。结果表明,反应挤出制备的聚丙烯接枝马来酸酐(PP?g?MAH)基热熔胶综合性能优异,其剥离强度和100 %拉伸弹性回复率分别可达131.4 N/25 mm和65.5 %;高低温循环（-40~130 ℃）800次后自制热熔胶的剥离强度依然可以维持在122.2 N/25 mm,剥离失效率只有7.0 %,其耐温性明显优于选取的两个商业化牌号热熔胶。     

EVA型热熔胶的材料与性能

本文介绍了共聚物ＥＶＡ树脂结构,ＥＶＡ树脂,增粘剂及其它调解剂配比对热熔胶性能的影响。