相转变组分法制备缠结聚合物有机分散液研究进展与展望

曹文恺¹，王利鹏¹，宿思琦¹，顾  捷²，白永平^1,2

（1.哈尔滨工业大学化工与化学学院，黑龙江哈尔滨  150001；2.无锡海特新材料研究院有限公司，江苏无锡  214100）

【摘  要】分别概述了高、低能乳化法的技术原理，并分析了不同乳化法的技术特点及应用现状。通过借鉴纳米乳液的制备方法，结合缠结聚合物的结构特性以及纳米乳液体系中有机相的分子量低、易变形特性，分析出高能乳化法制备缠结聚合物分散液的缺陷，确定低能乳化法中的相转变法是实现缠结聚合物分散液制备的方法。结合相转变温度法（PIT）和相转变组分法（PIC）对乳化剂曲率变化的影响，确定了PIC法制备缠结聚合物有机分散液的技术可行性，并对缠结聚合物应用领域的拓展进行了技术展望。

【关键词】高能乳化；低能乳化；相转变温度法；相转变组分法

丙烯酸酯基导电压敏胶研究进展

徐 丹¹，张军营²，牛栋华¹，宋佳赟¹，刘  彤¹，程  珏²

(1.北京天宇航天新材料科技有限公司，北京 101407；2.北京化工大学材料科学与工程学院，北京 100020）

【摘  要】综述了丙烯酸酯基导电压敏胶的三类填料的研究进展，包括金属填料、无机非金属填料以及杂化填料。对丙烯酸酯基导电压敏胶的结构设计进行了汇总，包括在丙烯酸酯基础上接入氨基甲酸酯键、环氧基团的导电压敏胶。最后对丙烯酸酯基导电压敏胶未来发展进行了展望。

【关键词】导电压敏胶；丙烯酸酯；导电填料

室温快速固化耐温型环氧树脂的制备及改性密封胶的性能研究

刘坛坛¹，魏  敏¹，程振朔²，朱新宝^1,2

（1.南京林业大学化学工程学院，江苏南京  210037；2.安徽新远科技股份有限公司，安徽黄山  245900）

【摘  要】以邻苯二甲酸酐和环氧氯丙烷为原料合成邻苯二甲酸二缩水甘油酯（PADE），并将其作为一种基体树脂制备了双组分密封胶。对PADE的结构以及双组分密封胶的表干时间、硬度、力学性能、热性能、热稳定性和微观形貌进行测定或表征。研究结果表明：⑴通过FT-IR和¹H-NMR对产物进行了结构表征，产物的环氧值为0.58 mol/100 g，室温（25 ℃）下的黏度为2 245 mPa·s。⑵PADE-10%密封胶比未添加PADE的密封胶表干时间缩短了30 min。⑶随着PADE的掺入量的增大，环氧密封胶的拉伸强度、断裂伸长率、弯曲强度和冲击强度先上升后下降，当PADE添加量为10%时，综合力学性能较好；PADE-10%密封胶在不同的老化时间下拉伸剪切强度均高于PADE-0的密封胶，说明此胶粘剂具有一定的耐老化性。⑷发现PADE具有催化作用，降低了活化能，提高了反应速度；并且随着PADE的加入，体系的T_g不断降低，从93.1 ℃降低到81.6 ℃。⑸PADE-0（纯E-51）密封胶的T_10%和T_max均小于PADE-10%密封胶，说明PADE的掺入形成高交联网络，使得固化物结构更加致密。适量添加PADE，可提高密封胶的耐热性，使密封胶具备更优异的力学性能。⑹通过研究掺入PADE后对改性E-51环氧密封胶粘接机制的影响发现，E-51固化物断裂面呈现脆性断裂特征，而掺入10%PADE时环氧密封胶的断裂表面显示出有序的能带结构，并伴随着大量细小的银纹出现，表现为韧性断裂特征，表明PADE具有增强增韧的作用。

【关键词】密封胶；缩水甘油酯；快速固化；力学性能；热稳定性

烯丙基醚化酚醛亚胺树脂的固化动力学研究

胡良凯¹，虞鑫海¹，李枝芳²

（1.东华大学化学与化工学院，上海 201620；2.山东圣泉新材料股份有限公司特种树脂研究所，山东济南  250200）

【摘  要】采用差示扫描量热仪测定了不同升温速率下烯丙基醚化酚醛亚胺树脂(APMI-F树脂)的DSC曲线，用非等温热力学的研究方法研究了APMI-F树脂的固化反应动力学。用T-β外推法确定了APMI-F树脂的固化反应的起始温度T_i、峰值温度T_p和终止温度T_f，并将其作为探究APMI-F树脂固化工艺的依据。通过Kissinger法和Starink法求得APMI-F树脂的表观活化能，由Starink法得到不同固化度下的表观活化能，并将其与试验数据对比，以验证固化动力学模型的准确性。研究结果表明：⑴利用外推法确定了APMI-F树脂固化反应的T_i、T_p和T_f分别为161.09、226.81、263.42 ℃；⑵Starink法求得的平均活化能要高于Kissinger法所得数据；⑶在固化反应过程中，随着固化程度的升高，APMI-F树脂的表观活化能呈现先降低后升高的趋势，固化初期活化能因黏度的降低而降低，随着交联度的提高，链段运动受到限制导致活化能渐渐升高；⑷采用Málek法成功地建立了APMI-F树脂的固化动力学模型，通过与试验数据对比，发现该模型能够很好地描述APMI-F的固化过程。

【关键词】酚醛亚胺树脂；烯丙基酚醛；固化反应动力学；加成固化反应；表观活化能

聚氨酯绷带用PEG-CL-LA共聚物的制备及其性能的研究

虞远忠，夏浙安，陈伶俐，叶  炜

（华东理工大学材料科学与工程学院，上海  200237）

【摘  要】以辛酸亚锡为催化剂，聚乙二醇（PEG）为起始剂，ε-己内酯（CL）和乳酸（LA）为原料，在170 ℃和高真空的条件下直接缩聚合成了不同数量CL单元与LA单元的二元醇共聚物（PLCA）。PLCA与过量的4,4’-二苯基甲烷二异氰酸酯（MDI-100）及少量叔胺类催化剂混合，在70 ℃反应，得到异氰酸酯封端的共聚物混合胶体（PLCA-PU），并涂覆在聚酯多孔编织带上制备出聚氨酯绷带。保持PEG的量，改变CL和LA的比例和异氰酸酯的量，得到一系列的PLCA和PLCA-PU。对它们的结构进行了分析，并对聚氨酯绷带的固化时间、径向压缩力值进行了测试。研究结果表明：成功制备了PLCA和PLCA-PU；当R=5、n(PEG)∶n(CL)∶n(LA)=1∶6∶7时，PLCA-PU制备的绷带的固化时间为383 s，压缩力值最高能达到19.4 N；选用合适的物料配比可以满足绷带尽快固化、具有合适刚性强度的要求。

【关键词】聚乙二醇；聚氨酯绷带；ε-己内酯；乳酸

兼具高湿强度及长开放期EPI木材胶粘剂的制备与性能表征

余桂勋，黄  鹤

（苏州大学材料与化学化工学部，先进功能高分子材料国家地方联合工程实验室，江苏苏州    215123）

【摘  要】首先分别制备了湿强度优异（6.4 MPa）但开放期较短（40 min），以及开放期较长（145 min）但湿强度偏低（3.8 MPa）的EPI木材胶粘剂用两款乳液（SAEP3和SAEP4），然后探索了两种乳液的配比对复合乳液胶粘剂性能的影响。研究结果表明：当两款乳液用量一样时，产生了协同效应，制得的乳液（SAEP5）胶粘剂开放期为100~120 min，湿强度达6.4 MPa。与同样条件下测试的市售SL6517胶粘剂相比，其开放期相当，湿强度高出SL6517胶粘剂（均值5.1 MPa）约25%。由此，成功制备兼具高湿强度及长开放期的EPI木材胶粘剂。

【关键词】木材胶粘剂；苯丙乳液；湿强度；开放期；复合乳液

轨道车辆用地板布铺装工艺验证的探讨

赵  民，王  浩

（中车青岛四方机车车辆股份有限公司，山东青岛  266111）

【摘  要】针对轨道车辆地板布鼓泡问题，以某车型一等座车厢为研究对象，其地板布铺装结构为“铝蜂窝地板+三层隔音材（未确定材质）+某型号橡胶地板布”。通过正交试验优化最佳焊接施工工艺参数，通过T型剥离、表面润湿试验、热膨胀变形率等判断不同种类隔音材的性能及地板布与隔音材之间的匹配性，通过恶劣环境下结构件的模拟试验确认铺装工艺的可行性，最后根据以上试验结果完成地板布铺装的工艺验证。研究结果表明：⑴适合橡胶地板布焊接的最佳工艺参数为，焊接机温度刻度为3.0，速度刻度为2.5，出风量刻度为2.0，此时焊接接头拉伸强度最大，熔合状态良好；⑵从T型剥离强度、表面润湿性、热膨胀变形等三个维度对隔音材匹配性进行试验分析，表明“铝蜂窝地板+三层橡胶隔音材+橡胶地板布”基本满足生产要求；⑶“铝蜂窝地板+DN341SA+第一层橡胶隔音材+DU345D+第二层橡胶隔音材+DU345D+第三层橡胶隔音材+DN341SA+橡胶地板布”体系，经过高低温循环试验及持续高温试验没有发生地板布表面鼓泡和焊缝开裂的情况，表明该铺装体系耐老化能力强，可满足列车生产及运营的需求。

【关键词】轨道车辆；地板布；工艺验证；老化试验

星载微波介质谐振器高可靠粘接技术研究

樊  田¹，张  乐^1,2，樊  凯¹，第五东超¹

（1.中国空间技术研究院西安分院，陕西西安  710100；2.空间微波技术国家级重点实验室，陕西西安710100）

【摘  要】介质谐振器是星载微波多工器的核心组件，是通信卫星有效载荷的关键组成部分。介质谐振器一般由圆柱形的低损耗、高介电常数、对温度变化稳定的陶瓷介质制成，通常采用胶粘剂粘接在专用螺钉上，并通过石英管或柱调节在多工器腔体中的位置。针对星载微波介质陶瓷谐振器粘接技术中存在的关键难点，通过对选胶、粘接、试验验证等全流程进行控制，设计专用工装保证粘接同轴度、粘接压力、胶粘剂用量等工艺因素，同时保证粘接可靠性和介质谐振器的高Q值，并按照星载产品的试验量级进行了热学、力学、辐照验证，实现了微波介质陶瓷材料的高可靠粘接，从而获得性能优异的星载微波无源产品。研究结果表明：星载微波介质谐振器的粘接工艺由胶液特性、粘接面粗糙度及胶液使用控制工艺所决定。一个满足宇航级使用的谐振器，在特定的工艺参数下通过宇航级的试验验证才可具备宇航飞行的资格。

【关键词】星载；介质谐振器；胶粘剂；高Q值；可靠性

填料及增塑剂对聚硫型道路灌缝胶性能的影响研究

田培军¹，刘虓嵩²，陈  嵩³，张增平²，杨  洋¹，夏静杰¹，钱建行⁴

（1.宁波东兴沥青制品有限公司，浙江  宁波  315000；2.长安大学教育部特殊地区公路工程重点实验室，陕西西安  710064；3.江苏高速公路工程养护有限公司，江苏淮安  223000；4.长安大学长安都柏林国际交通学院，陕西西安  710018）

【摘  要】采用轻质CaCO₃、重质CaCO₃、高岭土和纳米ZnO作为聚硫型道路灌缝胶的填料进行对比，气相SiO₂作为补强填料加入到灌缝胶中，并选用了两种增塑剂邻苯二甲酸二丁酯（DBP）和邻苯二甲酸丁苄酯（BBP）进行比较。研究了不同填料、增塑剂的类型以及掺量对聚硫型道路灌缝胶性能的影响，同时确定了配制聚硫型灌缝胶的填料及增塑剂的最佳掺量。研究结果表明：轻质CaCO₃作为填料制备的聚硫型灌缝胶具有更好的力学性能，并且能够在体系中更好地分散；BBP相较于DBP更加绿色环保，不容易污染基材，因此填料和增塑剂分别选用轻质CaCO₃和BBP。通过对其力学性能、微观形貌、分散情况和热稳定性的研究后认为，当轻质CaCO₃的最佳掺量为200份、BBP的最佳掺量为80份时，所制备的聚硫型灌缝胶的综合性能较好。

【关键词】聚硫型道路灌缝胶；填料；增塑剂；道路养护

Research progress and prospects on organic dispersion of entangled polymer prepared by phase inversion component method

Cao Wenkai¹, Wang Lipeng¹,Su Siqi¹, Gu Jie², Bai Yongping^1,2

(1.School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China; 2.Wuxi HIT New Material Research Institute Co., Ltd., Wuxi  214100, Jiangsu, China)

【Abstract】The technical principles of high and low energy emulsification methods were summarized respectively, and the technical characteristics and application status of different emulsification methods were analyzed. Inspired by the preparation method of nano emulsions, combining the structural characteristics of entangled polymer and the low molecular weight and easy deformation characteristics of organic phase in nano emulsion system, the defects of preparing entangled polymer dispersion by high-energy emulsification method were analyzed, and the phase transformation in the low energy emulsification method could be used to prepare entangled polymer dispersion. The technical feasibility of preparing organic dispersion of entangled polymer by PIC method was determined by combining the effects of phase inversion temperature (PIT) method and phase inversion component (PIC) method on the curvature change of emulsifiers, and the expansion of the application field of entangled polymer was prospected.

【Keywords】high energy emulsification; low energy emulsification; phase inversion temperature method; phase inversion component method

Research progress in acrylate-based conductive pressure sensitive adhesive

Xu Dan¹, Zhang Junying²,Niu Donghua¹, Song Jiayun¹, Liu Tong¹,Cheng Jue²

(1.BeijingTianyu Aerospace New Material Technology Co., Ltd., Beijing  101407, China; 2.College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing  100020, China)

【Abstract】The research progress of three types of fillers for acrylate-based conductive pressure sensitive adhesive, including metal fillers, inorganic non-metallic fillers, and hybrid fillers were reviewed. The structural design of acrylate-based conductive pressure sensitive adhesive, which includes accessing to urethane bond and epoxy group on the basis of acrylate-based conductive pressure sensitive adhesive was summarized. Finally, the future development of acrylate-based conductive pressure sensitive adhesive was prospected.

【Keywords】conductive pressure sensitive adhesive; acrylate; conductive filler

Preparation of temperature resistant epoxy resin with rapid curing at room temperature and properties of modified sealant

Liu Tantan¹, Wei Min¹, Cheng Zhenshuo², Zhu Xinbao^1,2

（1.College of Chemical Engineering, Nanjing Forestry University, Nanjing  210037, Jiangsu, China; 2.Anhui Xinyuan Technology Co., Ltd., Huangshan  245900, Anhui, China）

【Abstract】Phthalic acid diglycidyl ester (PADE) was synthesized by using phthalic anhydride and epichlorohydrin as raw materials, and then it was used as matrix resin to prepare two-component sealant. The structure of PADE and the surface drying time, hardness, mechanical properties, thermal properties, thermal stability, and microstructure of two-component sealant were measured or characterized. The research results showed that, ⑴The product was structurally characterized by FT-IR and ¹H-NMR. The epoxy value of the product was 0.58 mol/100 g, and the viscosity at room temperature (25 ℃) was 2 245 mPa·s. ⑵The surface drying time of PADE-10% sealant was shortened by 30 minutes compared to the sealant without PADE added. ⑶As the amount of PADE added increased, the tensile strength, elongation at break, flexural strength and impact strength of epoxy sealant first increased and then decreased. When the amount of PADE added was 10%, the comprehensive mechanical properties were excellent. The tensile shear strength of PADE-10% sealant at different aging time was higher than that of PADE-0 sealant, indicating that this adhesive had certain aging resistance. ⑷ It was found that PADE had a catalytic effect, reducing the activation energy and increasing the reaction speed. With the addition of PADE, the T_gof the system continued to decrease, from 93.1 ℃to 81.6 ℃. ⑸ TheT_10%and T_maxof PADE-0 (pure E-51) sealant were lower than those of PADE-10% sealant, indicating that the addition of PADE formed a highly crosslinked network, making the cured product structure denser. Adding an appropriate amount of PADE could improve the heat resistance of the sealant and made the sealant have better mechanical properties. ⑹ By studying the effect of adding PADE on the bonding mechanism of modified E-51 epoxy sealant, it was found that the fracture surface of E-51 cured product exhibited brittle fracture characteristics, while the epoxy sealant added with 10% PADE showed an ordered band structure on the fracture surface, accompanied by a large number of small silver lines, exhibiting ductile fracture characteristics, indicating that PADE had the enhancing and toughening effect.

【Keywords】sealant; glycidyl ester; fast curing; mechanical property; thermal stability

Study on curing kinetics of allyl etherified phenolic imine resin

Hu Liangkai¹,Yu Xinhai¹,Li Zhifang²

(1. College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China;2. Special Resin Research Institute, Shandong Shengquan New Materials Co., Ltd., Ji’nan  250200, Shandong, China)

【Abstract】The DSC curves of allyl etherified phenolic imine resin (APMI-F resin) were measured at different heating rates by using differential scanning calorimeter. The curing reaction kinetics of APMI-F resin were studied by using non isothermal thermodynamic research method. Using T-β extrapolation method, the starting temperature T_i, peak temperature T_p, and termination temperature T_f of the curing reaction of APMI-F resin were determined, and it was used as the basis for exploring the curing process of APMI-F resin. The apparent activation energy of APMI-F resin was obtained by Kissinger method and Starink method. The apparent activation energy at different curing degrees was obtained by Starink method and compared with experimental data to verify the accuracy of the curing kinetics model. The research results showed that, ⑴ The T_i, T_p and T_f of the curing reaction of APMI-F resin were determined by extrapolation method to be 161.09, 226.81 and 263.42 ℃, respectively. ⑵ The average activation energy obtained by Starink method was higher than that obtained by Kissinger method. ⑶ During the curing reaction, as the degree of curing increased, the apparent activation energy of APMI-F resin showed a trend of first decreasing and then increasing. In the initial stage of curing, the activation energy decreased due to the decrease in viscosity. As the degree of crosslinking increased, the movement of chain segments was limited, leading to a gradual increase in activation energy. ⑷ The curing kinetics model of APMI-F resin was successfully established through the Málek method, and compared with experimental data, it was found that the model could well describe the curing process of APMI-F.

【Keywords】phenolic imine resin; allyl group phenolic; curing reaction kinetics; addition curing reaction; apparent activation energy

Preparation and properties of PEG-CL-LA copolymer for polyurethane bandage

Yu Yuanzhong, Xia Zhean, Chen Lingli, Ye Wei

(School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China)

【Abstract】Using stannous octoate as the catalyst, polyethylene glycol (PEG) as the starting agent, ε-caprolactone (CL) and lactic acid (LA) as raw materials, the binary alcohol copolymers (PLCA) with different quantities of CL unit and LA unit were directly condensed and synthesized under the condition of 170 ℃ and high vacuum. PLCA was mixed with an excess of 4,4'-diphenylmethane diisocyanate (MDI-100) and a small amount of tertiary amine catalyst, reacted at 70 ℃ to obtain a copolymer mixed colloid (PLCA-PU) with isocyanate end terminated, which was then coated on polyester porous woven belt to prepare polyurethane bandage. By maintaining the amount of PEG, changing the ratio of CL and LA and the amount of isocyanate, a series of PLCA and PLCA-PU were obtained. Their structures were analyzed, and the curing time and radial compressive force of polyurethane bandage were tested. The research results showed that PLCA and PLCA-PU had been successfully prepared. When R=5, and n(PEG)∶n(CL)∶n(LA)=1∶6∶7, the curing time of the bandage prepared by PLCA-PU was 383 s, the maximum compressive force could reach 19.4 N. Choosing the appropriate material ratio could meet the requirements of rapid curing and having appropriate rigidity and strength of bandage.

【Keywords】polyethylene glycol; polyurethane bandage; ε-caprolactone; lactic acid

Preparation and performance characterization of EPI wood adhesive with high wet strength and long opening period

Yu Guixun, Huang He

(College of Chemistry, Chemical Engineering and Materials Science of Soochow University, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Suzhou 215123, Jiangsu, China)

【Abstract】First, two emulsions (SAEP3 and SAEP4) for EPI wood adhesive, i.e. one with excellent wet strength (6.4 MPa) but short opening period (40 min) , the other with long opening period (145 min) but low wet strength (3.8 MPa), were prepared respectively. Then the effect of the ratio of two emulsions on the properties of composite emulsion adhesive was explored. The research results showed that, when the amount of two emulsions was the same, the synergistic effect was achieved. The opening period of the prepared emulsion (SAEP5) adhesive was 100-120 min, and the wet strength reached 6.4 MPa. Compared with the commercially available SL6517 adhesive tested under the same conditions, its opening period was equivalent, and its wet strength was about 25% higher than that of SL6517 adhesive (average 5.1 MPa). As a result, EPI wood adhesive with high wet strength and long opening period was successfully prepared.

【Keywords】wood adhesive; styrene-acrylate emulsion; wet strength; opening period; composite emulsion

Discussion on process verification of flooring cloth paving for rail vehicles

Zhao Min, Wang Hao

（CRRC Qingdao Sifang Co., Ltd., Qingdao  266111, Shandong, China）

【Abstract】In response to the problem of bulging on the flooring cloth of rail vehicles, the first class carriage of a certain vehicle model was taken as the research object. The flooring cloth paving structure was "aluminum honeycomb floor + three layers of soundproofing material (undetermined material) + a certain type of rubber flooring cloth". The optimal welding construction process parameters were optimized through orthogonal experiment. The performance of different types of soundproofing materials and the matching between flooring cloth and soundproofing materials were judged through T-shaped peeling, surface wetting test, thermal expansion deformation rate, etc. The feasibility of the paving process was confirmed through simulation experiment of structural parts in harsh environment. Finally, the process verification of flooring cloth paving was completed based on the above experimental results. The research results showed that, ⑴ The optimal process parameters suitable for welded rubber flooring cloth were the welding machine temperature scale of 3.0, the speed scale of 2.5, and the air output scale of 2.0. At this time, the tensile strength of the welded joint was the highest and the fusion state was good.⑵ Experimental analysis was conducted on the compatibility of soundproofing materials from three dimensions: T-shaped peel strength, surface wettability, and thermal expansion deformation. The results showed that "aluminum honeycomb floor + three layers of rubber soundproofing materials + rubber flooring cloth" basically met the production requirements. ⑶ The system of "aluminum honeycomb floor + DN341SA + the first layer of rubber soundproofing material + DU345D + the second layer of rubber soundproofing material + DU345D + the third layer of rubber soundproofing material + DN341SA + rubber flooring cloth" had undergone high and low temperature cycling test and continuous high temperature test without any surface bulging and weld cracking of the flooring cloth, indicating that the paving system had strong aging resistance and could meet the needs of rail production and operation.

【Keywords】rail vehicles; flooring cloth; process verification; aging test

Research on high reliability bonding technology for space-borne microwave dielectric resonator

Fan Tian¹, Zhang Le^1,2, Fan Kai¹, Diwu Dongchao¹

[1.China Academy of Space Technology (Xi’an), Xi’an710100, Shaanxi, China；2.National Key Laboratory of Science and Technology on Space Microwave, Xi’an  710100, Shaanxi, China]

【Abstract】Dielectric resonator is the core component of the space-borne microwave dielectric multiplexer and is a key component of the payload of communications satellite. Dielectric resonator is generally made of cylindrical ceramic media with low loss, high dielectric constant, and stability to temperature changes. Usually, adhesive is used to bond onto specialized screws and adjust the position in the multiplexer chamber through quartz tubes or columns. In response to the key difficulties in the bonding technology of space-borne microwave dielectric ceramic resonator, a dedicated fixture was designed to control the entire process of adhesive selection, bonding, and experimental verification, ensuring process factors such as adhesive coaxiality, bonding pressure, and adhesive dosage. Simultaneously ensuring the reliability of bonding and the high Q value of the dielectric resonator, thermal, mechanical and radiation verifications were carried out according to the experimental level of space-borne products, achieving high reliability bonding of microwave dielectric ceramic materials and obtaining high-performance space-borne microwave passive products. The research results showed that the bonding process of space-borne microwave dielectric resonator was determined by the characteristics of the adhesive, the roughness of the bonding surface, and the control process of the adhesive usage. A resonator that met the requirements for aerospace use could only be qualified for aerospace flight after passing aerospace level testing verification under specific process parameters.

【Keywords】space-borne; dielectric resonator; high Qvalue; reliability

Research on the influence of fillers and plasticizers on the performance of polysulfide road potting sealant

Tian Peijun¹, Liu Xiaosong², Chen Song³, Zhang Zengping²,Yang Yang¹, Xia Jingjie¹, Qian Jianxing⁴

（1.Ningbo Dongxing Asphalt Products Co., Ltd., Ningbo  315000, Zhejiang, China;2.Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an  710064, Shaanxi, China; 3.Jiangsu Expressway Engineering Maintenance Co., Ltd., Huaian 223000, Jiangsu, China; 4.Chang’an Dublin International College of Transportation at Chang’an University, Xi’an 710018,Shaanxi, China）

【Abstract】A comparison was made by using lightweight CaCO₃, heavy CaCO₃, kaolin, and nano ZnO as fillers for polysulfide road potting sealant. Fumed SiO₂ was added as the reinforcing filler to the sealant, and two kinds of plasticizers, dibutyl phthalate (DBP) and butyl benzyl phthalate (BBP) were selected for comparison. The influence of different types and dosages of fillers and plasticizers on the performance of polysulfide road potting sealant was studied, at the same time, the optimal dosage of filler and plasticizer for polysulfide potting sealant was determined. The research results showed that the polysulfide potting sealant prepared with lightweight CaCO₃ as filler had better mechanical properties and could be better dispersed in the system. Compared to DBP, BBP was more environmentally friendly and less prone to contaminating the substrate. Therefore, lightweight CaCO₃ and BBP were selected as filler and plasticizer, respectively. After studying their mechanical properties, microstructure, dispersion, and thermal stability, it was believed that the comprehensive performance of the prepared polysulfide potting sealant was relatively good when the optimal dosage of lightweight CaCO₃ was 200 parts and the optimal dosage of BBP was 80 parts.

【Keywords】polysulfide road potting sealant; filler; plasticizer; road maintenance