耐热溶剂型丙烯酸酯压敏胶的制备与性能

在引发剂过氧化苯甲酰(BPO)的引发作用下合成溶剂型丙烯酸酯压敏胶(PSA),通过加入不同用量的黏度调节剂来改善压敏胶的耐热性能。采用差示扫描量热仪(DSC)及红外光谱对丙烯酸酯压敏胶进行了表征;通过制备压敏胶带,讨论了黏度调节剂对压敏胶180°剥离强度的影响;并运用旋转黏度计测试了其黏度在不同温度下的变化量。结果表明:反应时间为6.5 h,反应温度为78℃,溶剂乙酸乙酯(EAc)的用量与黏性单体质量一致时,所制备的溶剂型PSA性能较好。加入黏度调节剂后的压敏胶,玻璃化温度为-36.507℃左右,并增大了压敏胶的180°剥离强度,黏度调节剂用量为总质量的4%、6%时,压敏胶性能稳定,且耐热性优异。     

聚氨酯-聚丙烯酸酯互穿聚合物网络压敏胶及其耐热性研究

为了提高丙烯酸酯压敏胶的耐热性能,本文采用聚氨酯/聚丙烯酸酯(PU/PAA)互穿聚合物网络(IPN)技术对丙烯酸酯压敏胶进行改性,研制出一种软化点达到125℃左右的耐热压敏胶。分析讨论了不同制备工艺因素对该压敏胶性能的影响,并对其耐热性机理进行了探讨。     

聚氨酯-聚丙烯酸酯互穿聚合物网络压敏胶及其耐热性研究

为了提高丙烯酸酯压敏胶的耐热性能,本文采用聚氨酯/聚丙烯酸酯(PU/PAA)互穿聚合物网络(IPN)技术对丙烯酸酯压敏胶进行改性,研制出一种软化点达到125℃左右的耐热压敏胶。分析讨论了不同制备工艺因素对该压敏胶性能的影响,并对其耐热性机理进行了探讨。     

耐高温聚丙烯酸酯压敏胶的合成与研究

采用溶液聚合的方法制备了具有良好粘接性能的溶剂型聚丙烯酸酯压敏胶,并探讨了聚合工艺、聚合单体配方等对聚丙烯酸酯压敏胶的物理性能和粘接性能的影响。在此基础上,引入交联剂乙酰丙酮铝、异氰酸酯、耐高温材料硅树脂对压敏胶基胶进行耐高温改性,制得了耐高温性能优异的聚丙烯酸酯压敏胶。研究结果表明:相对较优的聚合条件是软单体丙烯酸异辛酯(2-EHA)与丙烯酸丁酯(BA)的比例为2∶1,硬单体苯乙烯(St)的含量为7%,官能单体丙烯酸(AA)的含量为3.5%,丙烯酸羟丙酯(HPA)的含量为0.6%,引发剂过氧化二苯甲酰(BPO)的用量占单体总量的0.3%。交联剂的引入可影响聚丙烯酸酯压敏胶体系的粘接性能,其中,乙酰丙酮铝(ALAA)交联得到的压敏胶的综合性能要优于甲苯二异氰酸酯(TDI)交联得到的压敏胶。甲基乙烯基MQ硅树脂的引入,可以大幅度提高聚丙烯酸酯压敏胶的耐高温性能,并且对压敏胶的黏性和内聚强度有一定的提升;当VMQ硅树脂的含量为单体总量0.8%时,压敏胶的黏性和耐高温性能较佳,经过260℃/5 min高温测试后,依然保持良好的黏性,且压敏胶未出现黄变现象。     

新型硅改性丙烯酸酯压敏胶的研究

MQ硅树脂可用作改性聚丙烯酸酯类压敏胶,在保持较好力学性能(初粘性、持粘性和剥离强度)和绝缘性的同时,可较大地提高硅改性压敏胶的耐高温性能。MQ树脂的结构和压敏胶的性能用29Si-NMR,DSC,粘性等表征。MQ硅树脂含量对硅改性压敏胶性能影响极大,通常MQ硅树脂用量为(0.3～0.5)%时具有较好的综合性能。该压敏胶粘剂可以直接涂布于经电晕处理的聚酯膜制备压敏胶粘带,便于工业化生产。     

紫外光本体聚合制备丙烯酸酯压敏胶

采用紫外光(UV)本体聚合的方法,将光引发剂在UV LED光源激发分解下引发多种丙烯酸酯类单体聚合制备压敏胶。考察了光照强度与距离的关系以及不同单体的聚合反应速率,进而确定了软硬单体最佳配比以及压敏胶最佳反应时间,表征了压敏胶交联前后的热稳定性,并且将UV本体聚合制备的压敏胶与加热本体聚合的压敏胶进行了对比。结果显示,当丙烯酸(AA)作为硬单体、软硬单体配比为90∶10(质量比)、单体质量为30g、反应时间为20s时,压敏胶有最佳的综合性能。与加热本体聚合相比,UV本体聚合制备的压敏胶无论在性能还是生产方式上都占有很大优势。     

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。     

便贴纸用热熔压敏胶的研制

介绍了以苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)为基础材料制备便贴纸用热熔压敏胶的方法,讨论了其他原材料如:增粘树脂、软化剂、防老剂等的选择对热熔压敏胶性能的影响。     

卫生用品用环保型热熔压敏胶的研制

介绍了以嵌段共聚物苯乙烯-丁二烯-苯乙烯(SBS)为基础材料制备卫生用品用热熔压敏胶的方法,讨论了其它原材料:增粘剂、增塑剂、防老剂以及反应温度、反应时间、空气中的氧对热熔压敏胶性能的影响。     

UV本体聚合制备压敏胶的性能研究

以丙烯酸酯类单体为原料,采用UV本体聚合的方法制备丙烯酸酯预聚物,然后补加引发剂和光敏树脂后制备得到压敏胶。选择丙烯酸(AA)作为硬单体,考察了单体的选择及配比、预聚物中单体转化率、固化光照强度、光敏树脂交联剂以及引发剂用量对压敏胶性能的影响,并通过TG表征了固化前后的热稳定性,DSC表征了玻璃化温度,最后将光聚合与热聚合生产的压敏胶进行了对比。结果表明:当AA含量为10%,BA与2-EHA质量比为4:1,光敏树脂用量为3%~3.5%时,压敏胶的综合性能最佳;而较低的固化光照强度可以赋予压敏胶更好的力学性能,适宜的引发剂用量可以提高固化速率。与加热溶液聚合相比,UV本体聚合制备的压敏胶无论在性能还是生产方式上都具有很大的优势。     

有机硅压敏胶的研制

采用价格低廉的水玻璃制备MQ硅树脂,通过对硅树脂体系引入苯基、乙烯基提高压敏胶的综合性能,研究MQ硅树脂的合成与压敏胶的制造工艺,制备出高性能的有机硅压敏胶。     

用于药物透皮吸收制剂的压敏胶的新进展

药物制剂的发展很大程度上依赖于药用辅料的发展，一种新型高分子药用辅料的开发将会带动一类新剂型和一大批药物新制剂的发展，药用压敏胶的发展对于药物透皮吸收制剂的发展至关重要，本文主要综述了国内外用于药的透皮吸收制剂的压敏胶的发展现状，包括几种通用压敏胶和压敏胶的最新进展。     

纳米SiO2-Al2O3协同改性有机硅压敏胶的性能研究

采用纳米SiO2和Al2O3两种粉体协同对有机硅压敏胶进行改性,并以改性后的压敏胶为胶黏剂,聚酰亚胺薄膜、云母纸、无碱玻璃布为基材制备柔软复合材料。研究了纳米粒子含量和比例对有机硅压敏胶耐热性和柔软复合材料电性能的影响。实验结果表明:适量的纳米SiO2和Al2O3加到有机硅压敏胶中,使压敏胶的表观分解温度和复合材料的击穿场强得到明显提高。     

Sustainable isosorbide‐based transparent pressure‐sensitive adhesives for optically clear adhesive and their adhesion performance

A biomass‐based isosorbide acrylate (ISA) was synthesized in a one‐pot reaction at low temperature with a quite slow dropwise technique using a syringe pump. Using the ISA monomer, UV‐cured transparent acrylic pressure‐sensitive adhesives (PSAs) composed of semi‐interpenetrating networks were prepared. The effect of ISA on the adhesion performance of the resulting acrylic PSAs was investigated by changing the ISA content, while fixing the mole ratio between 2‐ethylhexyl acrylate and 2‐hydroxyethyl acrylate in the PSAs. The prepared acrylic PSAs, with ISA content ranging from 3.2 to 14.3 mol%, were evaluated in terms of 180° peel strength, probe tack, static shear testing and optical properties. Increasing the ISA content in the acrylic PSAs improved the adhesion properties, such as 180° peel strength (0.25–0.32 N/25 mm), shear holding power (0.086–0.023 mm) and probe tack (1.21–2.26 N). Dynamic mechanical analysis indicated that ISA is a good candidate monomer, playing the role of adhesion promoter and hard monomer in the acrylic PSAs. © 2017 Society of Chemical Industry     

Synthesis of high‐solid‐content,acrylic pressure‐sensitive adhesives by solvent polymerization

In this study, we prepared high solid content (SC), solvent‐based, acrylic pressure‐sensitive adhesives (PSAs) with n‐dodecyl mercaptan as a chain‐transfer agent (CTA) and studied the crosslinking reactions between the crosslinker and the acrylic PSAs. Acrylic PSAs were prepared from 2‐ethyl hexyl acrylate, acrylic acid (AA), and 2‐azobisisobutyronitrile with a solution polymerization process. The results show AA resulted in an effective molecular weight in the acrylic PSAs, as it improved the hydrophilicity with increasing peel strength of the acrylic PSAs. As for the high SC, the molecular weight and system viscosity decreased through the addition of CTA. At a constant AA amount, the addition of CTA decreased the molecular weight and increased the hydrophobicity of the acrylic PSAs; this decreased the peel strength of the acrylic PSAs on the glass. Furthermore, the addition of CTA decreased the molecular weight and improved the acrylic PSAs' surface morphologies and optical properties. The acrylic PSAs produced in this study could meet production needs. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46257.     

乳液型聚丙烯酸酯医用压敏胶的改性研究

分别采用多步乳液聚合法和乳液共混法改性制备粘接性能较好的乳液型聚丙烯酸酯医用压敏胶。分析讨论了种子乳液的组成、预溶胀时间和预溶胀次数、引发剂种类、原位聚合温度等因素对压敏胶粘接性能的影响。结果表明,多步乳液聚合法是全面提高粘接性能的有效方法;而基于预乳化半连续聚合工艺的乳液共混法,仅在一定范围内有改性效果。     

Improvement in wettability of pressure‐sensitive adhesive on silicon wafer using crosslinking agent with siloxane groups

Acrylic copolymers are prepared by radical polymerization of 2‐ethylhexyl acrylate, ethyl acrylate, and acrylic acid followed by crosslinking to manufacture the pressure‐sensitive adhesives (PSAs) for silicon wafer protection. Both higher reliability and wettability are required for the protective acrylic PSAs in the semiconductor processing applications. The siloxane linkages are introduced in the acrylic PSAs via crosslinking with siloxane‐containing crosslinking agent to modify the thermal and wetting properties of PSAs efficiently. The more efficient formation of crosslinked network structure was achieved with higher content of tetra‐functional crosslinking agent, and the surface energy of PSAs decreased significantly with increasing the content of siloxane linkage resulting in the improved areal wetting rate. The thermal stability of PSAs was also improved significantly by incorporation of siloxane linkages. The adhesion properties such as peel strength and probe tack of acrylic PSAs decreased significantly by increasing the content of either crosslinking agent or siloxane linkage. The acrylic PSA with siloxane group showed both satisfactory wetting and clean debonding properties for the optimal protection of thin silicon wafers. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Effects of blending and coating methods on the performance of SIS (styrene-isoprene-styrene)-based pressure-sensitive adhesives

SIS (styrene-isoprene-styrene)-based pressure sensitive adhesives (PSAs) were prepared by melt- or solution-blending. In the coating process, two methods were used: solution coating and melt coating. The performances of the PSAs were found to be different, depending on which of these two blending or coating methods was used. In this study, we investigated the relationship between the viscoelastic properties and the performances of the SIS-based PSAs using different blending and coating methods. Three methods were used: (1) melt-blending and melt-coating, (2) melt-blending and solution-coating and (3) solution-blending and solution-coating. PSAs applied using melt-blending/melt-coating (M—M) have higher peel strength and probe tack than PSAs applied using melt-blending/solution-coating (M—S) and solution blending/solution coating (S—S). However, PSAs applied using M—M blends have lower holding power and SAFT (Shear adhesion failure temperature) than PSAs applied using M—S and S—S blends. The viscoelastic properties and GPC curves of M—S blends were similar to M-M blends, while the peel strength and tack of M—S blends were similar to S—S blends. Therefore, it was concluded that the blending process had more effect on the viscoelastic properties and shear creep of PSAs than the coating process.     

Adhesion performance of UV-cured semi-IPN structure acrylic pressure sensitive adhesives

UV-curable solvent-free pressure sensitive adhesives (PSAs) are gaining importance in the area of adhesives because of increasing environmental concerns and the goal to reduce volatile organic compounds (VOCs) in work areas and consumption places. These PSAs have advantages such as low emission of VOCs, a solvent-free process, a fast producton rate at ambient temperature and only a modest requirement for operating space. In this study, UV-curable PSAs were investigated by measuring their adhesion performance in terms of probe tack, peel strength, shear adhesion failure temperature (SAFT) and holding power. PSAs were synthesized from 2-ethylhexyl acrylate (2-EHA), acrylic acid (AA) and vinyl acetate (VAc), using variations in AA concentration to control the glass transition temperature (T _g) of the prepared PSAs. In addition, two types of trifunctional monomers, trimethylolpropane triacrylate (TMPTA) and trimethylolpropane ethoxylated (6) triacrylate (TMPEOTA), which have different chain lengths, were used to form semi-interpenetrating polymer network (semi-IPN) structures after UV exposure. With increasing AA concentration in the PSAs, both the T _g and viscosity increased. Also, probe tack and SAFT increased, but peel strength decreased. After UV irradiation, probe tack decreased, and SAFT and peel strength increased as AA concentration increased in the PSAs. In most cases, cohesive failure changed to interfacial failure after UV exposure. Also, TMPTA increased the cohesion of PSAs; however, TMPEOTA affected the mobility of PSAs due to the different chain lengths of the two types of trifunctional monomer in a different way. The increase of TMPEOTA content diminished the cohesion of PSAs. Consequently, the adhesion performance of the PSAs was closely related to the T _g of the PSAs, and the two types of trifunctional monomer showed different adhesion performances.     

Heat resistance of acrylic pressure-sensitive adhesives based on commercial curing agents and UV/heat curing systems

The development of adhesive tapes that can be applied at high temperature is a major challenge for pressure-sensitive adhesives (PSAs). To date, the heat resistance of PSAs has not been investigated in sufficient details. In this study, based on the relationship between curing structures and properties, a series of acrylic PSAs with excellent heat resistance were prepared. Commercial zirconium acetylacetonate (ZrACA), desmodur L75 (L75), and N,N,N′,N′-tetrakis(2,3-epoxypropyl)-m-xylene-α,α′-diamine (GA240) were employed as heat-curing agents. Trimethylolpropane triacrylate (TMPTA) was used as ultraviolet (UV)-curing agent to form semi-interpenetration polymer network structures after UV exposure. The influences of different curing agents on the thermal stability, adhesion performance, gel fraction, and viscoelastic of PSAs were explored. The results showed that the PSAs cured by L75, GA240, and TMPTA exhibited excellent heat resistance. Especially, when the content of L75 was 1.0 wt %, the PSAs could be peeled off substrate without residues on substrate surface after treatment at 170 °C for 4 h, while the nonmodified acrylic PSAs possessed residues after treatment from 110 °C. The cured PSAs adhesive performance was evaluated showing maximum 180° peel strength of 16.7 N/25 mm comparable to current PSAs. These resulting PSAs showed high heat resistance and they are suitable for a broad range of special fields. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47310.