SIS型热熔压敏胶的粘接性能及动态流变行为研究

以SIS(苯乙烯-异戊二烯-苯乙烯三嵌段共聚物)作为基体树脂制备HMPSA(热熔压敏胶)。研究了不同类型增塑剂与SIS基体的相容性对压敏胶(PSA)性能及动态流变行为的影响,并探讨了PSA性能与动态流变行为之间的关系。结果表明:当增塑剂与SIS中PS(聚苯乙烯)相的相容性较好时,相应HMPSA在低频(1 Hz)时的储能模量较低,初粘力较好;当增塑剂与SIS中PI(聚异戊二烯)相的相容性较好时,相应HMPSA在高频(100 Hz)时的损耗模量较高,剥离强度较大。     

热熔压敏胶粘接性能的流变学研究

研究了苯乙烯嵌段共聚物系热熔压敏胶的动态流变学行为和持粘力之间的联系,主要研究了决定持粘力的流变学参数.研究证明,持粘力受到体系的蠕变过程的控制,可以通过较高温度下得到的持粘力数据来预测室温持粘力的大小.研究了液体树脂含量对持粘力的影响,提出损耗角正切(tan δ)最小值及其对应的温度是决定热熔压敏胶持粘力的关键流变学参数.     

大豆油基压敏胶粘接性能和交联机制研究

以环氧大豆油为原料,通过研究磷酸添加量、松香酯添加量、涂胶厚度、反应温度和反应时间等因素对大豆油基压敏胶粘接性能的影响,确定大豆油基压敏胶的较佳制备工艺。在此基础上,采用傅里叶变换红外光谱仪（FT-IR）和核磁共振仪（NMR）对压敏胶的结构进行解析,揭示其交联聚合机制和老化前后的结构变化。研究结果表明：大豆油基压敏胶的较佳制备工艺为,w（磷酸）=6%,w（松香酯）=70%（均相对于环氧大豆油质量而言）,涂胶厚度为80μm,反应温度为50℃,反应时间为5 min。此时,胶膜呈连续状态,分子链间得到有效缠结,聚醚、聚酯反应逐步进行,极性官能团较多,与钢板的贴合力更强,交联程度较大,内聚强度增大,制备的大豆油基压敏胶无残胶,180°剥离强度为（1.866±0.18）N/cm,环形初粘力为（3.88±0.44）N。结合FTIR和1H-NMR分析压敏胶结构,表明磷酸一方面催化环氧键开环生成羟基聚醚,另一方面可以和环氧大豆油生成磷酸酯,还有部分以游离态存在。大豆油基压敏胶中松香酯以共价或物理嵌段的形式,一部分完全嵌入网络结构中,一部分以半嵌入式或游离状态在聚合物结构中。     

SIS热熔压敏胶的研制

本文研究了以SIS为主体材料的热熔。敏胶的配比问题。探讨了增粘剂、增塑剂种类、含量对压敏胶性能的影响。试验表明，在特定配方组成中，胶粘剂的初粘力随增粘剂、增塑剂用量增大而提高，其软化点下降。     

热熔压敏胶(SI)nR的制备和性能

以自制的星形嵌段共聚物(SI)nR为主胶，制备了热熔压敏胶。结果表明，所得到的试样完全符合热熔压敏胶的要求，其初始黏接性小于80mm，持续黏接性大于20h，剥离强度大于0．50kN／m。     

环保型热熔压敏胶的制备

实验采用加氢改性后的C5石油树脂,即氢化C5石油树脂作为热熔压敏胶(HMPSA)配方中的增黏剂,SBS热塑性弹性体为增韧剂,同时还加入了增塑剂和少量的抗氧剂和防老剂等助剂,来制备环保型热熔压敏胶.并通过对压敏胶产品初黏性、180℃熔融黏度、剥离强度等性能的测定,得到了一个最佳的热熔压敏胶配方.实验结果表明,当氢化C5石...     

热熔压敏胶(SI)nR的制备和性能

以自制的星形嵌段共聚物(SI)nR为主胶,制备了热熔压敏胶.结果表明,所得到的试样完全符合热熔压敏胶的要求,其初始黏接性小于80 mm,持续黏接性大于20 h,剥离强度大于0.50kN/m.     

热塑性水胶体压敏胶力学性能与流变性能研究

本文主要讨论压敏胶橡胶组分的配比对胶体性能的影响。用动态流变仪测试了25℃压敏胶从低频到高频的储能模量(E’)、损耗模量(E’’)、损耗因子(tanδ),从微观上表征压敏胶的力学性能及其橡胶组分配比对性能的影响。结果表明,随着环烷油,液体橡胶,增粘树脂的增加,胶体在粘合频率(0.01~1HZ)下储能模量减小,初粘增大;随着低分子量聚异丁烯,增粘树脂的增加,胶体的剥离频率(100HZ)下损耗模量增大,剥离强度增大;随着增粘树脂、高分子量聚异丁烯的增加,粘度、内聚强度增加,持粘时间增加。     

APAO热熔压敏胶的流变性能研究

采用高级流变扩展系统（ARES）研究了基体树脂无规聚α 烯烃(APAO)的牌号、增黏剂C5石油树脂用量和增塑剂种类对APAO热熔压敏胶流变性能的影响。结果表明,APAO相对分子质量越大,热熔压敏胶的剪切黏度越高;随着C5石油树脂用量的增加,热熔压敏胶的剪切黏度会出现一个峰值;增塑剂的相对分子质量越小,热熔压敏胶剪切黏度越小,而增塑剂的种类对热熔压敏胶的切敏性无影响;同时热熔压敏胶的温敏性良好,温度升高,热熔压敏胶的黏度下降,高温低频率时切敏性较差,高温高频率时切敏性良好,随着温度的降低,切敏性变好。     

丙烯酸酯乳液压敏胶合成及其常规性能研究

采用半连续种子乳液聚合法制得纯丙乳液压敏胶。研究了胶粘剂厚度、基材厚度、基材类型对压敏胶常规力学性能影响。结果发现,各因素对压敏胶的初粘性和剥离强度影响较大;基材厚度及类型对持粘性影响较小;胶层厚度为15μm左右的压敏胶具有较高性价比。     

Rheological and adhesion properties of acrylic pressure‐sensitive adhesives

Different pressure‐sensitive adhesives (PSAs) based on acrylic monomers were synthesized under different reaction conditions. The synthesized PSAs have good adhesive properties and without leaving any residue can be easily peeled off from the surface of a substrate. The relationship between PSAs rheological behavior and its adhesion properties (e.g., peel, tack, and shear resistance) has been studied at constant adhesive thickness. The samples were examined for their surface energy and viscoelastic characteristics. It was observed that increase in reaction temperature and reaction time results in decreased storage modulus due to lowered molecular weight, which finally leads to lower elasticity of the PSA. While the storage (G′) and loss (G″) modulus of samples increase with increased initiator concentration, the elasticity of PSA is increased as well. High G″ at high frequency (100 Hz) represents high peel strength because of higher dissipation of viscoelastic energy during debonding. The tack values increase by lowering storage modulus at 1 Hz due to higher M_e. Shear values are increased by higher storage modulus at low frequency (0.1 Hz) due to hydrogen bonding of the different components. Some parallel investigations on the surface energy of the samples showed that they have different properties because of the nature of different monomeric units with their corresponding orientations. Our results reveal that the peel strength is not affected by surface energy. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

热塑性弹性体型热熔压敏胶的研究进展

介绍了热熔压敏胶用热塑性弹性体以及增粘树脂的特点、作用以及研究进展,并对热熔压敏胶的发展方向以及应用前景进行了展望。     

四元共聚丙烯酸酯热熔压敏胶膜的合成研究

以丙烯酸-2-乙基己酯(2-EHA)、甲基丙烯酸甲酯(MMA)、丙烯腈(AN)和丙烯酰胺(AM)为共聚单体,采用预乳化法制备聚丙烯酸酯热熔胶,研究了单体用量配比,乳化剂用量、配比及乳化方式,引发剂用量,温度和滴加速度对反应及性能的影响。结果表明：2-EHA/MMA 1/0．6,AN 5％,AM 5％,复合乳化剂3．0％,引发剂过硫酸钾0．3％,80～85℃,反应4h,丙烯酸酯橡胶分子量在10万以上时,制得的热熔压敏胶膜综合性能良好。     

丙烯酸酯类压敏胶的合成与性能研究

以丙烯酸丁酯（BA）、丙烯酸异辛酯（2-EHA）、醋酸乙烯酯（VAc）、丙烯酸（AA）、丙烯酸羟丙酯（HPA）为原料,乙酸乙酯为溶剂,过氧化苯甲酰为引发剂制备了五元共聚丙烯酸酯类压敏胶。考查了软单体组成、软硬单体配比、丙烯酸用量、丙烯酸羟丙酯加量、增粘树脂对压敏胶性能的影响。实验结果表明,当软单体m2-EHA：mBA=2：1、软硬单体的质量比为6：1、丙烯酸用量为5％、丙烯酸羟丙酯加量为8％、松香用量为5g时,压敏胶性能较佳。     

环氧化SDS型热熔压敏胶的制备及粘接性能研究

采用苯乙烯-丁二烯-苯乙烯(SBS)和苯乙烯-异戊二烯-苯乙烯(SIS)嵌段共聚物,并配合极性的环氧化SBS(ESBS)和环氧化SIS(ESIS)作为基体材料,制备了环氧化SDS(苯乙烯系热塑性弹性体)型热熔压敏胶。研究了ESBS和ESIS用量对压敏胶的初粘力、持粘力和在不同极性底材上剥离强度的影响。结果表明,随着ESBS和ESIS用量的增加,压敏胶的初粘力和持粘力下降,在聚乙烯(PE)上的剥离强度下降,但在聚氯乙烯(PVC)和不锈钢上的剥离强度先增加后下降。当ESBS和ESIS的质量份数均为20份时,压敏胶的初粘力和持粘力分别为23#和43.6 h,在PVC和不锈钢底材上的剥离强度分别达到0.82 N/mm和1.10 N/mm。     

Effects of polymeric emulsifiers on the properties of acrylic emulsion pressure‐sensitive adhesives

A series of polymeric emulsifiers was polymerized with 2‐ethylhexyl acrylate, butyl acrylate, and acrylic acid. The polymeric emulsifiers were used to make emulsion copolymers of 2‐ethylhexyl acrylate, butyl acrylate, and acrylic acid. The average particle size of the synthesized emulsions was around 145 nm and the size distribution was very narrow. Also, the emulsions showed good freeze–thaw stability and adhesion properties. The peel strength and holding power of the emulsions were investigated by changing the composition and molecular weight of the polymeric emulsifier. The results show that the peel strength exhibits a maximum at particular molecular weight and acrylic acid content of the polymeric emulsifier, while the holding power increases with molecular weight. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 1456–1460, 2004     

Adhesion and rheological properties of EVA-based hot-melt adhesives

Ethylene vinyl acetate (EVA) copolymers of various melt indexes were blended with aromatic hydrocarbon resin in the molten state, and the thermal and adhesion properties as hot-melt adhesives (HMAs) were investigated. The thermal properties for the EVA blends with aromatic hydrocarbon resin were studied using differential scanning calorimeter, Brookfield viscometer and dynamic mechanical thermal analyzer. Their adhesion strength was also obtained using single lap shear strength. The examination of thermal properties for the blend of EVA copolymers with aromatic hydrocarbon resin over a large temperature range showed that the glass transition temperature was independent of their melt index (MI), but that their heat of fusion decreased with increasing MI of EVA copolymers. Furthermore, the storage and loss moduli of the blends decreased with increasing temperature and MI of EVA copolymers, but the loss tangent (tan δ) of the blends increased. An increase in the MI of EVA copolymers decreased the adhesion strength of the blend at the same test condition.     

共混热塑性弹性体热熔压敏胶的制备及性能研究

以苯乙烯热塑性弹性体(HYBRAR7311)和丙烯酸酯热塑性弹性体(LA2250)为主体树脂,2种材料优势互补,制备的热熔压敏胶(HMPSA)性能优良,且工艺设备简单。采用正交实验较优热熔压敏胶配比,在此基础上探讨了填料硅微粉对热熔压敏胶性能的影响,并比较了较优配方热熔压敏胶与自制SIS热熔压敏胶和乳液压敏胶的力学性能。针对3种压敏胶力学性能上的差异,对3种压敏胶的粘弹性能进行了对比研究,结果表明,压敏胶在低频区(0.01~0.1 Hz)贮能模量越小,初粘性越大,E’’(f 1)/E’(f 2)越大(f 1=32.03 Hz,f 2=0.07 Hz),剥离强度越大。