SIS技术参数对其热熔压敏胶性能的影响

研究了SIS的技术参数对SIS热熔压敏胶性能的影响。试验表明,星型结构的SIS热熔压敏胶熔融黏度较低,持粘性、剥离强度较大,软化点较高;嵌段比增大,SIS热熔压敏胶的初粘性降低、持粘性增大、熔融黏度减小、软化点升高;分子质量增大,SIS热熔压敏胶的初粘性降低、持粘性增大、熔融黏度增大、软化点升高;2嵌段SI含量增加,SIS热熔压敏胶初粘性增大、持粘性降低,180°剥离强度先增大后减小,且压敏胶的熔融黏度减小、软化点降低、分切性能变好。     

苯乙烯-异戊二烯两嵌段对线型三嵌段聚合物性能的影响

苯乙烯-异戊二烯线型三嵌段（SIS）中加入一定量苯乙烯-异戊二烯两嵌段（SI）对于改进SIS热熔压敏胶性能有一定影响,主要考察不同分子量、嵌段比及含量的SI对线型SIS的力学性能、流动性能及制成热熔压敏胶的性能的影响,结果表明,线型三嵌段SIS中,掺入10％～30％（质量分数）的两嵌段SI,对产品的力学性能影响不明显,对产品的硬度、流动性能有一定影响;将掺有两嵌段SI的线型SIS制成热熔压敏胶后,产品的粘合性能较单纯使用线型SIS做热熔压敏胶有所改善。     

不同种类苯乙烯系热塑性弹性体对热熔压敏胶性能影响

在标签用热熔压敏胶配方基础上研究苯弹性体对胶黏剂性能的影响。研究结果表明:弹性体苯乙烯含量由14%增加至30%时,热熔压敏胶软化点由75℃增至89℃,初黏力由2.2cm降至5.5cm,标签纸渗油量逐渐减少。弹性体苯乙烯含量为15%,双嵌段含量由0增至38%时,剥离强度由0.42kN/m升至1.01kN/m。弹性体的熔融流动指数(MI)由8g/10min增加至25g/10min时,热熔压敏胶的175℃熔融黏度由9200mPa.s下降至2200mPa.s。     

嵌段共聚物结构特征对HMPSA黏附性的影响

为研究嵌段共聚物的结构特征对HMPSA(热熔压敏胶)黏附性(如初粘力、剥离强度和持粘力等)的影响,以不同结构特征的SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)为骨架制备了相应的HMPSA。研究结果表明:SIS弹性体的Mr(相对分子质量)越低且SI(苯乙烯-异戊二烯)双嵌段比例越高,HMPSA的初粘力就越大,而持粘力也就越低,剥离强度则随SIS弹性体的Mr增加而增大;将HMPSA的流变性(储能模量、损耗模量和动态黏度等)与黏附性关联后,HMPSA的初粘力和低频区的储能模量呈负相关,剥离强度和高频区的损耗模量相关,持粘力和系统低频区的动态黏度成正比,说明嵌段共聚物的结构对HMPSA的黏附性影响显著。     

SIS型热熔压敏胶影响因素分析

通过熔融混合制备SIS型热熔压敏胶,重点考察了增黏树脂、软化油、SIS结构参数等因素对热熔压敏胶黏度、初黏、剥离强度的影响。采用单因素实验法系统探讨软化油、增黏树脂、主体树脂等对热熔压敏胶黏度、初黏、剥离等性能的影响,并进一步探讨增黏树脂内在物理化学结构对热熔压敏胶的影响,结果表明:增黏树脂软化点高低对热熔压敏胶的黏度和剥离强度有重大影响。通过正交试验法得出:影响黏度的关键因素是油含量,影响剥离强度的关键因素是增黏树脂,影响初黏的关键因素是油含量和增黏树脂。     

苯乙烯-异戊二烯嵌段聚合物热熔压敏胶性能影响因素探讨

用不同种类增粘树脂、不同牌号苯乙烯-异戊二烯嵌段聚合物(简称SIS)制备SIS热熔压敏胶,考察不同种类增粘树脂、不同牌号SIS及萜烯树脂含量对SIS热熔压敏胶性能的影响,结果表明:萜烯树脂是改性SIS热熔压敏胶适宜的增粘树脂,当萜烯树脂在SIS热熔压敏胶中含量达50%时,SIS热熔压敏胶性能较佳,随不同牌号SIS中两嵌段SI含量的增加,SIS热熔压敏胶的剥离强度有所增加,持粘力有所下降。     

无溶剂型热熔压敏胶的制备及影响因素研究

本文阐述了苯乙烯-异戊二烯嵌段共聚物(SIS)在热熔压敏胶的应用,列举了热熔压敏胶所需原料组分,并展开对热熔压敏胶的影响因素作了进一步研究,探讨了着不同嵌段结构、增粘树脂选型及加入量、环烷油加入量及SIS加入量对热熔压敏胶性能的影响。     

吉化开发出SIS热塑弹性体

由吉化集团公司研究院开发成功的SIS热熔胶粘剂已通过吉林省原经贸委组织的专家鉴定。该胶所使用的SIS热塑性弹性体是苯乙烯和异戊二烯的嵌段共聚物,它兼有塑料的可塑性和硫化橡胶的韧性、弹性以及优良的电绝缘性,具有十分广泛的用途。由这种SIS制成的热熔胶,具有优良的加工性能及使用性能,可用于生产压敏标签和妇女卫生用品。吉化研究院经小试、中试逐级放大,研制出3种牌号的SIS产品,完全符合生产热熔压敏胶的要求。其制品在贮存1年后,初粘性无变化,在零摄氏度以下仍有粘附力。     

紫外光改性SIS热熔压敏胶研究

研究了紫外光改性苯乙烯-异戊二烯-苯乙烯嵌段共聚物(SIS)热熔压敏胶,探讨了SIS弹性体经紫外照射的交联反应机理,并用红外光谱分析;改性后SIS热熔压敏胶的持粘性、剥离强度和耐热性改善。     

用于中成药膏药载体的SIS热熔压敏胶配方研究

考查了多种增塑剂、增黏树脂及其用量对SIS热熔压敏胶的初粘性、持粘性、180°剥离强度和软化点的影响,并通过添加中成药的方法试验研究了膏药、贴剂用热熔压敏胶的配方,得出了m(SIS):m(环烷油):m(氢化C5石油树脂)=10:7:15的基础配方。所制备的膏药具有初粘性较好、持粘性较大、剥离力较小且加药温度较低的特点,满足了膏药、贴剂的使用要求。     

Rheological properties of hot melt pressure-sensitive adhesives based on styrene--isoprene copolymers. Part 1: A rheological model for [sis-si] formulations

The viscoelastic properties of hot melt pressure-sensitive adhesives (HMPSA) based on formulations of block copolymers and tackifying resins have been studied in detail, through the variation of the complex shear modulus, G*, as a function of frequency, y . In this first article, we analyze the individual behavior of the components of HMPSA blends: (1) the two copolymers, styrene-isoprene (SI) diblock copolymer and styrene-isoprene-styrene (SIS) triblock copolymer and (2) two tackifying resins. The viscoelastic behavior of the overall formulation is also presented. We have mainly studied the effects of (1) the molecular characteristics of the SI and SIS copolymers and (2) the composition of the blends (mainly the effect of SI content, S content in SIS and SI, resin content) on the viscoelastic properties. A theoretical approach based on concepts of molecular dynamics leads to a model which describes reasonably well the linear viscoelastic properties of individual components and their formulations. Our systematic study can be used to design new copolymer molecules which can mimic the rheological behavior and end-user properties of regular formulations at room temperature.     

PP/PE-g-MAH/蛋壳粉复合材料的性能研究

采用双螺杆挤出机制备了一系列不同配方的聚丙烯/马来酸酐接枝聚乙烯/蛋壳粉复合材料,研究了蛋壳粉用量对复合材料拉伸强度、冲击强度、断裂伸长率、硬度、维卡软化温度、熔体流动速率(MFR)的影响.结果表明,随着蛋壳粉用量的增加,复合材料的拉伸强度先增加后降低,冲击强度、断裂伸长率逐渐减小,硬度逐渐增加;随着蛋壳粉用量的增加,...     

Viscoelastic properties of a styrene-isoprene-styrene triblock copolymer and its blends with polyisoprene homopolymer and styrene-isoprene diblock copolymer

The effects of added polyisoprene homopolymer (PI) and polyisoprene-blockstyrene diblock copolymer (SI) on the viscoelastic properties of a polystyrene-block-polyisoprene-block-polystyrene triblock copolymer (SIS) having a spherical domain morphology have been examined. The former two species are used to model the effects of imperfections in structures that result from triblock copolymers missing, respectively, two or one polystyrene end blocks. The results indicate that the loss modulus and tangent delta in the plateau region can be dominated by imperfections in the copolymer structure. The interpretation of viscoelastic data in the rubbery plateau region as an indication of interface structure in block copolymers is therefore greatly complicated. Small angle X-ray scattering (SAXS) and rheological tests were also used to determine the order-disorder transition temperature for an SIS triblock copolymer and its blend with an SI diblock. The SAXS data are consistent with Han's rheological criteria for determining the order-disorder transition temperature. However, the complex viscosity does exhibit Newtonian behavior for low rates at the highest temperatures, even though the domain morphology persists. Stress relaxation and dynamic modulus data at high temperatures clearly show a secondary “rubbery” plateau at long times, and we offer a qualitative explanation for this feature based on a proposed relaxation mechanism.     

The mechanical properties of short fiber-styrenic block copolymer composites

The effect of fiber loading, fiber length, matrix type, and interface adhesion on mechanical properties of PET short fiber-styrenic block copolymer TPEs, SIS, and SBS, was investigated. A strong bonding between PET fiber and TPE was obtained by surface treatment of TPE with isocyanate in toluene solution. The stress of the composites, filled with treated fiber, increased with increasing strain by two steps; the modulus for the first step was higher than the one for the second step, and the composites yielded obviously at about 50% strain, with higher stress than that of matrix TPE. With increasing fiber loading and fiber length, the modulus for the first step and the yield stress increased, but the yield elongation decreased. It seems that the matrix elastomer underwent most of the deformation and that the filled fiber underwent large internal stress with little deformation during extension of the composite, which may be an important phenomenon to influence short fiber reinforcement. The stress softening of composites showed a somewhat larger decreased rate than that of the matrix with repeated stress-strain cycles, and the stress softening in the first cycle increased linearly with increasing fiber loading and increased in an S shape with increasing fiber length. In comparison with the SIS elastomer, the hysteresis of the SBS elastomer showed a big residual strain after the first elongation of 30%, and its retraction and subsequent re-extension curves were obviously different from the extension curve, which was considered to be due to the destruction of parts of the styrene hard domai in SBS. The stress softening of the composites was influenced by the matrix elastomer, as well as by the loading fiber. The interface separation around the end of a fiber under large strain, and the breaking and restructuring of hard domain in the matrix, were considered to be important sources of softening of the composite. © 1993 John Wiley & Sons, Inc.     

耐低温SBS热熔压敏胶的研制与应用

以长链高级脂肪酸(H18)、松香和甘油为原料,合成了低软化点、低酸值、低黏度和高透明性的H18改性松香甘油酯;然后以此作为SBS(苯乙烯-丁二烯-苯乙烯热塑性弹性体)基热熔压敏胶(HMPSA)的增黏树脂,探讨了H18改性松香甘油酯含量对HMPSA性能的影响。结果表明:当w(H18改性松香甘油酯)=10%时,HMPSA的环形初粘力、180°剥离强度相对最大,比未改性体系分别增加了54.81%、35.29%;适量的H18改性松香甘油酯可有效降低HMPSA的玻璃化转变温度(T_g)、提高HMPSA的耐寒性。     

SIS热熔压敏胶粘剂的研制

以SIS为主体原料,配合增粘树脂、增塑剂、防老剂等研制出SIS热熔压敏胶。通过实验对反应温度、反应时间、搅拌速度等工艺条件进行了优化;选择了合适的增塑剂、增粘树脂、软化剂、防老剂及填料,确定了胶粘剂的基本配方;讨论了各组分用量对粘接性能的影响,确定了其最适宜用量;通过正交优化设计,优化了SIS热熔压敏胶的配方,得出了包装用热熔压敏胶的最佳配方。     

低软化点204树脂在全钢子午线轮胎中的应用

试验研究低软化点204树脂在全钢子午线轮胎三角胶中的应用。结果表明,以低软化点204树脂等量替代高软化点204树脂后,胶料的硫化特性基本一致,硫化胶的邵尔A型硬度略低,100％和300％定伸应力、拉伸强度及拉断伸长率均有所提高,胶料的粘性提高。     

Epoxidation of Styrene-Isoprene-Styrene Block Copolymer and Its Use for Hot-Melt Pressure Sensitive Adhesives

The epoxidation of styrene-isoprene-styrene block copolymer (SIS) with performic acid generated in situ from hydrogen peroxide and formic acid was studied, and the hot-melt pressure sensitive adhesives (HMPSA) were prepared with epoxidized SIS (ESIS), SIS and the tackifier ESCOREZ-2203LC. The ¹H nucleal magnetic resonance and Fourier transform infrared spectra revealed that the epoxidation reaction mainly occurred in 1,4-isoprene units of SIS, and the reactivity of the cis-1,4-structure was higher than that of the trans-1,4-structure. Analysis by Gel Permeation Chromatography (GPC) showed that the molecular weight of SIS increased and the molecular weight distribution widened after epoxidation. Differential scanning calorimetry analysis showed that ESIS was compatible with SIS and ESCOREZ-2203LC. The addition of certain amount of polar ESIS in the HMPSA was beneficial to the improvement of 180° peel strength when the substrates were polar materials, such as PVC and steel. With the increase in peeling rate, the peel failure mode changed to adhesion failure from cohesion failure.