UPy封端超分子可剥离热熔胶的本体合成及性能研究

饶厚东¹，张  玲¹，程  伟¹，王雯霏¹，袁  煜²，魏柳荷²，李禹函²

（1.中国船舶集团有限公司第七二五研究所，河南洛阳  471027；

2.郑州大学化学学院，河南郑州  450001）

【摘  要】可重复使用及回收的胶粘剂是电子工业领域发展的必然趋势。本研究采用本体聚合法，以聚酯多元醇(7130)、聚乙二醇(PEG-1500)和异佛尔酮二异氰酸酯(IPDI)为原料合成聚氨酯预聚体。再以2-氨基-4-羟基-6-甲基嘧啶（UPy）封端，在直链型聚氨酯的末端接入UPy序列形成自互补四重氢键，合成了具备优良力学性能、粘接性能、抗冲击、可重复使用的超分子聚氨酯热熔胶（HMA-UPy），并对其结构和各项性能进行了测定或表征。研究结果表明：⑴成功合成了HMA-UPy，并且该热熔胶比常规的聚氨酯热熔胶法得到的分子量小；⑵在聚合物末端中引入UPy交联剂，对软链段的玻璃化转变温度（T_g）没有明显的影响，UPy序列提供了高热力学稳定性和快速的动力学可逆性，并且聚合物链末端的UPy序列不会破坏基于PEG-7130的软链段嵌段结构，从而使HMA-UPy柔软、可拉伸但又坚韧；⑶该热熔胶易于加工，可重复使用，机械强度良好，中等的黏流转变温度（135 ℃）和氢键的快速动态可逆性非常适合多次剥离和重复粘接；⑷该热熔胶具有两个失重峰值，分别为338.03和428.34℃，远高于常规热熔胶的热熔温度，完全满足使用需求；⑸这一合成策略有望为设计抗冲击和可重复使用的热熔结构胶开辟一条新的途径，对于开发高强度、可剥离、可重复使用、抗冲击的热可逆胶粘剂提出了一种新的策略，为其在工业生产领域的应用提供了一种有效方案。

【关键词】热熔胶；抗冲击；可重复；高强度；自互补四重氢键

新型含砜环氧胶粘剂的研制

赖立兴，虞鑫海

(东华大学化学与化工学院，上海  201620)

【摘 要】研究了主要成分为双酚S环氧树脂、E-51环氧树脂和SRTEM-80环氧树脂的环氧胶粘剂体系，通过改变胶粘剂体系中双酚S环氧树脂、E-51环氧树脂和SRTEM-80环氧树脂的比例，经过一系列化学反应，制备得到SJ-1、SJ-2、SJ-3、SJ-4和SJ-5等含砜的环氧胶粘剂体系。对其黏度性能、凝胶化时间、表观活化能、力学性能、电学性能、吸水性能等进行了系统研究，优化了配方及制备工艺。研究结果表明：双酚S环氧树脂和SRTEM-80环氧树脂中有较多的活性基团，可使胶粘剂体系的交联反应活性增加，交联速度加快，导致胶粘剂体系的凝胶化时间变短；5种胶粘剂的力学性能、电学性能和疏水性都较好，并且SJ-3胶粘剂的各项性能比其他配方均要优异；SJ-3胶粘剂固化后拉伸强度为32.3 MPa，电容为5.94~5.98 pF，介电损耗为0.37%~0.51%，吸水率仅为0.16%，是较合理的配方，有较大的应用前景。

【关键词】双酚S环氧树脂；环氧胶粘剂；含砜环氧胶粘剂；制备；性能

改性氮化硼/水性环氧导热绝缘涂层的制备及性能研究

黄  鹏，裴克梅

（浙江理工大学化学与化工学院，浙江杭州  310020）

【摘  要】在氢氧化钠溶液中使氮化硼(BN)羟基化，后协同三种硅烷偶联剂（KH-550、KH-560和KH-570）改性，制备了一系列偶联剂改性BN样品（mBN-550、mBN-560和mBN-570）。通过分散性能测试，确定了最佳改性硅烷偶联剂种类及用量。将具有最佳分散性的mBN-570加入水性环氧涂料中，制备了水性环氧导热绝缘涂层，并研究了mBN-570添加量对复合涂层的力学性能、导热性能、耐热性能和绝缘性能的影响。研究结果表明：⑴改性后的BN在环氧树脂溶液中的分散性提升，并且通过3%KH-570改性的mBN-570分散效果最好，分散时长为18 d；⑵力学性能测试表明，mBN-570含量为3%和5%时，mBN-570/EP复合涂层的力学性能均相对最佳；⑶导热性能测试表明，室温下5%mBN-570/EP复合涂层的热导率为0.245 W/(mžK)，比纯EP涂层提升了28.3%，同时5%mBN-570/EP复合涂层的散热速度明显快于纯EP涂层，因此5%mBN-570的加入提升了复合涂层的导热性能；⑷热稳定性能测试表明，5%mBN-570的加入显著增强了复合材料的热稳定性，并延缓了热降解过程；⑸绝缘性能测试表明，5%mBN-570/EP复合涂层的体积电阻率为2.65×10¹⁶Ωžcm，表面电阻率为4.73×10¹⁶Ω，因此该复合涂层具有较好的电绝缘性能。

【关键词】水性环氧树脂；氮化硼；表面改性；导热绝缘涂层

用于LED玻璃光显示基板的新型UV胶的制备及性能表征

李小源，罗文慧，黄芙铭，黄  路，李怡坤

（天津师范大学，天津  300387)

【摘  要】以脂环族环氧树脂为基体树脂，以氮化铝（AlN）为导热填料，制备了用于光显示基板的UV胶粘剂。通过测试显示基板上UV胶与铜箔间的综合性能（包括导热性能、剥离强度、耐浸焊性、可靠性分析及透光率测试）对材料进行全面评价。研究结果表明：在m(TA3150)∶m(TA21)=40∶60、光引发剂用量为环氧树脂质量分数3.5%、光促进剂用量为环氧树脂质量分数6%的胶液中，AlN用量为环氧树脂质量60%，UV胶可快速固化。其导热系数为1.1 W/(m∙K)，剥离强度为1.20 N/mm，耐浸焊时间达到10 min，透光率为86%，有很好的可靠性，满足LED玻璃光显示基板制备的性能要求，具有广阔的应用前景。

【关键词】环氧树脂；UV胶；导热系数；剥离强度；透光率；可靠性

高温持续老化对车用粘接接头静态特性的影响研究

杨  阳¹，林英豪²，王元伍³，范以撒²

（1.圣彼得堡理工大学材料与运输研究所，圣彼得堡  195251；2.华北水利水电大学机械学院，河南郑州 450040；3.中车唐山机车车辆有限公司，河北唐山  064000）

【摘  要】选择对接接头在高温80℃条件下，分别老化144、288、432、576和720 h，测试不同老化时间接头在常温下的失效载荷。把该失效载荷分成100%、60%、50%、40%、30%和20%六个等级进行疲劳试验，获得相应载荷等级接头疲劳失效次数。基于疲劳失效次数建立接头疲劳寿命函数，对比不同老化时间对接头疲劳寿命影响。最后，使用扫描电镜对比观察失效接头表面微观形貌。研究结果表明：⑴80 ℃条件下随着老化时间增加，对接接头平均失效强度缓慢减小，经过720 h高温老化，接头平均失效强度比初始减小了16.55%。⑵所有载荷-位移曲线全部呈非线性变化。80 ℃条件下随着老化时间增加，接头失效位移逐渐减小，说明高温老化导致粘接剂的韧性降低。虽然失效位移随老化时间逐渐减小，但是载荷-位移曲线斜率随老化时间增加而逐渐增加。⑶不同老化时间下，接头疲劳失效断面的微观形貌发生了明显变化。⑷疲劳试验数据表明，环境和时间的共同作用降低了粘接剂的疲劳耐久性，80 ℃高温环境下老化时间越久，对接头疲劳性能的影响越显著。

【关键词】轻量化；粘接技术；粘接接头；高温环境；疲劳特性

β-二酮的合成及其在金属粘接中的应用

刘倚帆，刘  燕，林  浩，刘  剑

（西南科技大学材料与化学学院，四川绵阳  621010）

【摘 要】以苯乙酮、庚酸乙酯为原料，乙二醇二甲醚为溶液，乙醇钠为催化剂，制备了1-苯基壬烷-1,3二酮(记为b-二酮)，用于对钢表面预处理以及处理后粘接性能的研究。研究了在有氧和无氧条件下β-二酮和铁的反应，测试了反应液中Fe³⁺浓度的变化、钢板表面的腐蚀情况，对使用b-二酮处理前后的钢板粘接接头进行粘接性能测试。研究结果表明：通过傅里叶变换红外光谱分析仪(FT-IR)和傅里叶数字化核磁共振仪(¹H-NMR)的结构表征，证明成功合成了β-二酮；电感耦合等离子体发射光谱分析证明，Fe只有被氧化成Fe³⁺才能与β-二酮中的氧原子形成配位键，生成螯合物；通过循环伏安测试和恒电位测试的方法，加速了b-二酮与钢板的反应速率；通过电化学的方法处理钢板2 h得到的表面腐蚀程度与在常温下处理18 h的表面相似，因此可以使用电化学处理来改善粘接性能；当β-二酮处理钢板18 h后，得到的粗糙面可以与胶粘剂形成牢固的机械互锁，粘接强度比原来提升了27.0%，达到了最高强度。

【关键词】β-二酮；表面预处理；螯合物；机械互锁；粘接强度

胶粘剂中丙烯酰胺及丙烯酸酯类残留单体释放量和含量的研究

孙文慧，刘晓琴，潘敏霞，田光超，何毅华，赵志浩，张兰兰

（广电计量检测集团股份有限公司，广东广州  510656）

【摘  要】采用袋式法对固化后的胶粘剂中丙烯酰胺及丙烯酸酯类残留单体进行释放量测定，研究了固化时间、试验温度及加热时间对这两类物质释放量的影响。研究结果表明：适当延长固化时间，对减少胶粘剂固化后的单体残留有明显作用；袋式法中试验温度为60 ℃时，胶粘剂中残留单体的释放量远大于试验温度为40 ℃对应的释放量，表明温度对胶粘剂残留单体的释放具有较大的影响；气袋的加热时间不同会对胶粘剂中残留单体的释放量造成影响，因此应选择合适的加热时间，避免残留单体未检出或过饱和情况；通过对各类胶粘剂固化后的残留单体进行释放量和含量情况分析，可以更加充分地了解各类胶粘剂的组成成分及环保性能；数据对比结果表明，胶粘剂中丙烯酰胺及丙烯酸酯类残留单体的释放量与含量基本呈正相关。

【关键词】胶粘剂；丙烯酰胺；丙烯酸酯；单体；释放量；含量；袋式法

丙烯酸酯压敏胶的制备及性能研究

王贝贝¹，曹  盛²，崔  傲¹，王莉娅²

（1.西安航空学院，陕西西安  710077；2.西安航天三沃化学有限公司，陕西西安  710089）

【摘  要】采用溶液聚合工艺，以丙烯酸-2-乙基己酯为软单体，丙烯酸甲酯为硬单体，丙烯酸为功能单体，乙酸乙酯为溶剂，偶氮二异丁腈为引发剂，制备了不同单体浓度和胶层厚度的溶剂型丙烯酸酯压敏胶。研究了单体浓度和胶层厚度对丙烯酸酯压敏胶力学性能（环形初粘力、180°剥离强度、持粘性）的影响。研究结果表明：单体浓度对丙烯酸压敏胶的固含率影响较小；单体浓度为47.64%时，黏度相对最为合适；当单体浓度为47.64%，胶层厚度30 μm时，可以得到在环形初粘力、180°剥离强度、持粘性这三种性能之间较为平衡和性能优异的丙烯酸酯压敏胶。

【关键词】丙烯酸酯；压敏胶；单体浓度；胶层厚度；力学性能

高性能聚酰亚胺胶粘剂的研究进展

时瑞鑫¹，吴  霄²，徐  慧²，蔡秀莲¹，于文芳¹，武明月¹，朱庆增¹

（1.山东大学化学与化工学院，特种功能聚集体材料教育部重点实验室，山东济南  250100；

2.中国航空工业集团公司济南特种结构研究所，山东济南  250023）

【摘要】聚酰亚胺凭借其优良的耐高温特性，在高科技领域中具有重要应用前景。本文综述了近年来高性能聚酰亚胺胶粘剂的研究以及应用进展。从聚酰亚胺胶粘剂的分类及改性的研究现状进行分析，重点描述了在聚酰亚胺中引入大体积基团、聚硅氧烷、活性端基等方法进行的结构改性，阐述了将聚酰亚胺与碳纤维和纳米无机颗粒组合的组分改性研究进展，并对高性能聚酰亚胺胶粘剂的发展前景作了展望。

【关键词】聚酰亚胺；改性；胶粘剂；研究进展

纤维素气凝胶的开发及其在染料吸附领域的应用

杜彦力¹，吴    桐²，赵学燕²，裴    璐²，任    芳²

（1.核工业203研究所，陕西  咸阳   712000；2.西安理工大学，陕西  西安   710048）

【摘    要】现代印刷工业产生的大量印染废水，如果直接排放，将严重破坏生态环境并威胁人体健康。在诸多解决污染的方法中，吸附法由于其操作简便、成本低廉以及无二次污染的绿色环保特性，备受研究者关注。纤维素气凝胶以其大的比表面积、高孔隙率、出色的生物相容性，以及可再生和可降解等特性，成为吸附领域的研究焦点。本文介绍了纤维素气凝胶的制备及改性方法（如疏水改性、化学改性），重点探讨了纤维素气凝胶在染料吸附领域的应用研究进展，并对纤维素气凝胶的发展前景进行了展望。

【关键词】印染废水；纤维素气凝胶；吸附性能；改性

Bulk synthesis and properties of UPy-terminated supramolecular peelable hot melt adhesive

Rao Houdong¹, Zhang Ling¹, Cheng Wei¹, Wang Wenfei¹, Yuan Yu², Wei Liuhe², Li Yuhan²

(1.CSSC Luoyang Ship Material Research Institute, Luoyang 471027, Henan, China; 2.College of Chemistry, Zhengzhou University, Zhengzhou  450001, Henan, China)

【Abstract】Reusable and recyclable adhesives are an inevitable trend in the development of the electronic industry.In this study, polyurethane prepolymer was synthesized by using polyester polyols (7130), polyethylene glycol (PEG-1500) and isophorone diisocyanate (IPDI) as raw materials through bulk polymerization. Then it was terminated with 2-amino-4-hydroxy-6-methylpyrimidine (UPy) and inserted into the UPy sequence at the end of the linear polyurethane to form self-complementary quadruple hydrogen bonds, the supramolecular polyurethane hot melt adhesive (HMA-UPy) with excellent mechanical properties, bonding properties, impact resistance, and reusability was synthesized, and its structure and various properties were measured or characterized.The research results showed that, ⑴ HMA-UPy was successfully synthesized, and the molecular weight of this hot melt adhesive was smaller than that obtained by conventional polyurethane hotmelt adhesive method. ⑵ Introducing UPy crosslinking agent into the polymer end had no significant effect on the glass transition temperature (T_g) of the soft chain segment. The UPy sequence provided high thermal mechanical stability and fast kinetic reversibility, and the UPy sequence at the polymer chain end did not damage the block structure of soft chain segment based on PEG-7130, making HMA-UPy soft, stretchable, but tough. ⑶ This hot melt adhesive was easy to process, reusable, with good mechanical strength, moderate viscous flow transition temperature (135 ℃), and fast dynamic reversibility of hydrogen bonds, making it very suitable for multiple peeling and repeated bonding. ⑷ This hot melt adhesive had two weight loss peaks, namely 338.03 and 428.34 ℃, which were much higher than the hot melting temperature of conventional hot melt adhesive and fully met the usage requirements. ⑸ This synthesis strategy was expected to open up a new path for designing impact resistance and reusable hot melt structural adhesive. It proposed a new strategy for developing high-strength, peelable, reusable, and impact resistance thermally reversible adhesive and provided an effective solution for their application in industrial production.

【Keywords】hot melt adhesive; impact resistance; repeatable; high-strength; self-complementary quadruple hydrogen bonds

Development of new sulfone-containing epoxy adhesive

Lai Lixing, Yu Xinhai

(College of Chemistry and Chemical Engineering, Donghua University 201620, Shanghai, China)

【Abstract】Epoxy adhesive systems consisting mainly of bisphenol S epoxy resin, E-51 epoxy resin and SRTEM-80 epoxy resin were investigated, and by changing the ratio of bisphenol S epoxy resin, E-51 epoxy resin and SRTEM-80 epoxy resin in the adhesive system, the epoxy adhesive systems containing sulfone such as SJ-1, SJ-2, SJ-3, SJ-4 and SJ-5 were prepared through a series of chemical reactions. The viscosity, gelation time, apparent activation energy, mechanical properties, electrical properties, water absorption properties were systematically studied, and the formulation and preparation process were optimized. The research results showed that bisphenol S epoxy resin and SRTEM-80 epoxy resin had more active groups, which could increase the activity of the crosslinking reaction of the adhesive system and accelerate the crosslinking speed, resulting in a shorter gelation time of the adhesive system. The mechanical properties, electrical properties, and hydrophobicity of the five adhesives were all good, and the various properties of SJ-3 adhesive were superior to other formulations. After curing, the tensile strength of SJ-3 adhesive was 32.3 MPa, the capacitance was 5.94-5.98 pF, the dielectric loss was 0.37%-0.51%, and the water absorption rate was only 0.16%, which was a reasonable formulation with great application prospects.

【Keywords】bisphenol S epoxy resin; epoxy adhesive; sulfone-containing epoxy adhesive; preparation; property

Preparation and properties of modified boron nitride/waterborne epoxy thermally conductive insulation coating

Huang Peng, Pei Kemei

(School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310020, Zhejiang, China)

【Abstract】A series of coupling agent modified BN samples (mBN-550, mBN-560 and mBN-570) were prepared by hydroxylation of boron nitride (BN) in sodium hydroxide solution and modification with three kinds of silane coupling agent (KH-550, KH-560 and KH-570). The optimal type and content of modified silane coupling agent were determined through dispersion performance testing. The waterborne epoxy thermally conductive insulation coating was prepared by adding mBN-570 with the best dispersibility to the waterborne epoxy coating. The effect of mBN-570 content on the mechanical properties, thermal conductivity, heat resistance, and insulation properties of the composite coating was studied. The research results showed that, ⑴ The dispersibility of modified BN in epoxy resin solution was improved, and the mBN-570 modified with 3% KH-570 had the best dispersion effect, with the dispersion time of 18 days. ⑵ The mechanical performance test indicated that when the content of mBN-570 was 3% and 5%, the mechanical properties of mBN-570/EP composite coating were relatively optimal. ⑶ The thermal conductivity test indicated that the thermal conductivity of the 5%mBN-570/EP composite coating at room temperature was 0.245 W/(mžK), which was 28.3% higher than that of the pure EP coating. At the same time, the heat dissipation rate of the 5%mBN-570/EP composite coating was significantly faster than that of the pure EP coating. Therefore, the addition of 5%mBN-570 improved the thermal conductivity of the composite coating. ⑷ The thermal stability test indicated that the addition of 5%mBN-570 significantly enhanced the thermal stability of the composite material and delayed the thermal degradation process. ⑸ The insulation performance test indicated that the volume resistivity of the 5%mBN-570/EP composite coating was 2.65×10¹⁶ Ωžcm, the surface resistivity was 4.73×10¹⁶Ω, therefore this composite coating had good electrical insulation performance.

【Keywords】waterborne epoxy resin; boron nitride; surface modification; thermally conductive insulation coating

Preparation and performance characterization of novel UV adhesive for LED glass display substrate

Li Xiaoyuan, Luo Wenhui, Huang Fuming, Huang Lu, Li Yikun

(Tianjin Normal University, Tianjin 300387, China)

【Abstract】UV adhesive for light display substrate was prepared by using alicyclic epoxy resin as matrix resin and aluminum nitride (AlN) as thermal conductive filler. The material was overall evaluated by testing the comprehensive performance between the UV adhesive on the substrate and the copper foil, including thermal conductivity, peel strength, immersion welding resistance, reliability analysis and light transmittance test. The research results showed that, in the adhesive solution with m(TA3150):m(TA21)=40:60, the content of photoinitiator was 3.5% of epoxy resin mass fraction, the content of photopromoter was 6% of epoxy resin mass fraction, the content of AlN was 60% of epoxy resin mass fraction, the UV adhesive could be quickly cured. Its thermal conductivity was 1.1 W/(m∙K), peel strength was 1.20 N/mm, immersion welding resistance time reached 10 minutes, and light transmittance was 86%. It had good reliability and met the performance requirements of LED glass display substrate preparation, which had broad application prospects.

【Keywords】epoxy resin; UV adhesive; thermal conductivity; peel strength; light transmittance; reliability

Effect of continuous aging at high temperature on static characteristics of vehicle adhesive joints

Yang Yang¹, Lin Yinghao², Wang Yuanwu³, Fan Yisa²

(1. Materials and Transportation Research Institute, Peter the Great Saint-Petersburg Polytechnic University, Saint-Petersburg195251, Russia; 2. School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou  450040, Henan, China;3.CRRC Tangshan Co., Ltd., Tangshan  064000, Hebei, China）

【Abstract】The butt joint was selected to be aged for 144, 288, 432, 576, and 720 hours respectively, at high temperature of 80 ℃, and the failure load of the joint at room temperature for different aging time was tested. The failure load was divided into six levels: 100%, 60%, 50%, 40%, 30%, and 20% for fatigue testing, and the corresponding number of fatigue failure of load level joints was obtained. The joint fatigue life function based on the number of fatigue failure was established, and the effect of different aging time on the joint fatigue life was compared. Finally, the microstructure of the failure joint surface was compared and observed by using scanning electron microscopy. The research results showed that, ⑴ Under the condition of 80 ℃, as the aging time increased, the average failure strength of the butt joint slowly decreased. After 720 hours of high temperature aging, the average failure strength of the joint decreased by 16.55% compared to the initial value. ⑵ All load-displacement curves exhibited nonlinear changes. Under the condition of 80 ℃, as the aging time increased, the joint failure displacement gradually decreased, indicating that high temperature aging led to a decrease in the toughness of the adhesive. Although the failure displacement gradually decreased with aging time, the slope of the load-displacement curve gradually increased with aging time. ⑶ Under different aging time, the microstructure of the fatigue failure section of the joint underwent significant changes. ⑷ The fatigue test data showed that the combined effect of environment and time reduced the fatigue durability of the adhesive. The longer the aging time in the high temperature environment of 80 ℃, the more significant the impact on the fatigue performance of the joint.

【Keywords】lightweight; adhesive technology; adhesive joint; high temperature environment; fatigue property

Synthesis of β-diketone and its application in metal bonding

Liu Yifan, Liu Yan, Lin Hao, Liu Jian

(School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China)

【Abstract】1-phenylnonane-1,3-diketone (denoted as β-diketone) was prepared by using acetophenone and ethyl heptanoate as raw materials, ethylene glycol dimethyl ether as solution, and sodium ethanol as catalyst, for the study of bonding properties with pretreatment of steel surface and after treatment. The reaction between β-diketone and iron was studied under aerobic and anaerobic conditions, the changes in Fe³⁺concentration in the reaction solution and the corrosion on the steel plate surface were tested, and the bonding performance of the steel plate bonding joints before and after treatment with β-diketone was tested. The research results showed that β-diketone was successfully synthesized by structural characterization of Fourier transform infrared spectroscopy (FT-IR) and Fourier digital nuclear magnetic resonance (¹H-NMR). Inductively coupled plasma emission spectroscopy analysis showed that coordination bonds could be formed with oxygen atoms in β-diketone after Fe  was oxidized into Fe3+, forming chelates. The reaction rate between β-diketone and steel plate was accelerated through cyclic voltammetry and potentio static testing methods. The surface corrosion degree obtained by electrochemical treatment of steel plate for 2 hours was similar to that obtained by treatment at room temperature for 18 hours, therefore electrochemical treatment could be used to improve bonding performance. When the steel plate was treated with β-diketone for 18 hours, the rough surface obtained could form the strong mechanical interlock with the adhesive, the bonding strength increased by 27.0% compared to the original, reaching the highest strength.

【Keywords】β-diketone; surface pretreatment; chelate; mechanical interlock; bonding strength

Study on release amount and content of acrylamide and acrylate residual monomers in adhesive

Sun Wenhui, Liu Xiaoqin, Pan Minxia, Tian Guangchao, He Yihua, Zhao Zhihao, Zhang Lanlan

(GRG Metrology & Test Group Co., Ltd., Guangzhou 510656, Guangdong, China)

【Abstract】The bag method was used to determine the release amount of residual monomers such as acrylamide and acrylate in cured adhesive. The effects of curing time, test temperature, and heating time on the release amount of these two substances were studied. The research results showed that extending the curing time appropriately had a significant effect on reducing the residual monomers of adhesive after curing. When the test temperature in the bag method was 60 ℃, the release amount of residual monomers in adhesive was much greater than the release amount corresponding to the test temperature of 40 ℃, indicating that temperature had a significant impact on the release of residual monomers in adhesive. The different heating time of the air bag could affect the release of residual monomers in adhesive. Therefore, an appropriate heating time should be selected to avoid the situation of undetected or oversaturated residual monomers. By analyzing the release amount and content of residual monomers in various adhesives after curing, it was possible to have a more comprehensive understanding of the composition and environmental performance of various adhesives. The data comparison results indicated that the release amount and content of residual monomers such as acrylamide and acrylate in adhesive were basically positively correlated.

【Keywords】adhesive; acrylamide; acrylate; monomer; release amount; content; bag method

Study on the preparation and properties of acrylate pressure sensitive adhesive

Wang Beibei¹, Cao Sheng ², Cui Ao¹, Wang Liya ²

(1.Xi'an Aeronautical Institute, Xi'an 710077, Shaanxi, China; 2.Xi'an Aerospace Sunvalor Chemical Co., Ltd., Xi'an  710089, Shaanxi, China)

【Abstract】Solvent-based acrylate pressure sensitive adhesive with different monomer concentrations and adhesive thickness were prepared by solution polymerization process, using 2-ethylhexyl acrylate as soft monomer, methyl acrylate as hard monomer, acrylic acid as functional monomer, ethyl acetate as solvent, and azodiisobutyronitrile as initiator. The effects of monomer concentration and adhesive thickness on the mechanical properties (loop tack, 180° peel strength and holding power) of acrylate pressure sensitive adhesive were studied. The research results showed that the monomer concentration had little effect on the solid content of acrylate pressure sensitive adhesive. When the monomer concentration was 47.64%, the viscosity was relatively optimal. When the monomer concentration was 47.64% and the adhesive thickness was 30 μm, the acrylate pressure sensitive adhesive with excellent performance and balance among the three properties of loop tack, 180° peel strength and holding power could be obtained.

【Keywords】acrylate; pressure sensitive adhesive; monomer concentration; adhesive thickness; mechanical property

Research progress of high performance polyimide adhesive

Shi Ruixin¹, Wu Xiao², Xu Hui², Cai Xiulian¹, Yu Wenfang¹, Wu Mingyue¹, Zhu Qingzeng¹

(1.Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan250100, Shandong, China; 2.AVIC Research Institutefor Special Structures of Aeronautical Composites, Jinan  250023, Shandong, China)

【Abstract】Polyimide has important application prospects in the high-tech field due to its characteristics of excellent high-temperature resistance. In this paper, the research and application progress of high performance polyimide adhesive in recent years were reviewed. The classification of polyimide adhesive and the current status of modification research were analyzed, the introduction of bulk groups, polysiloxanes, active end groups and other methods of structural modification in polyimide were mainly described. The research progress of component modification by combining polyimide with carbon fibers and nano inorganic particles was elaborated,and the development prospects of high performance polyimide adhesive were put forward.

【Keywords】polyimide; modification; adhesive; research progress

Development of cellulose aerogels and their application in dye adsorption

Du Yanli¹, Wu Tong²,Zhao Xueyan², Pei Lu², Ren Fang²

（1. No.203 Research Institute of Nuclear Industry, Xianyang    712000, Shaanxi, China; 2. Xi'an University of Technology, Xi'an    710048, Shaanxi, China）

【Abstract】The modern printing industry produces a large amount of printing and dyeing wastewater, if directly discharged, it will seriously damage the ecological environment and threaten human health. Among many methods to solve the pollution, adsorption method has attracted the attention of researchers due to its easy operation, low cost and green characteristics of no secondary pollution. Cellulose aerogels have become the focus of research in the field of adsorption due to their large specific surface area, high porosity, excellent biocompatibility, as well as renewable and degradable properties. In this paper, the preparation and modification methods (e.g., hydrophobic modification, chemical modification) of cellulose aerogels were introduced, the research progress on the application of cellulose aerogels in the field of dye adsorption was emphatically discussed, and the development prospect of cellulose aerogels was put forward.

【Keywords】printing and dyeing wastewater; cellulose aerogels; adsorption performance; modification