水下新老混凝土界面粘结剂的研究进展

欧阳增信^1,2，吴启民²，林忠华²，裴克梅¹

（1.中国电建集团华东勘测设计研究院有限公司，浙江杭州  311221；

2.浙江理工大学化学与化工学院，浙江杭州  310018）

【摘要】水下新老混凝土界面粘结剂是一种适用于水下或潮湿环境中的新型混凝土界面粘结剂，然而真正在水下能发挥较为理想作用的混凝土粘结剂却并不多见。本文基于环境的特殊性和混凝土的基本性质，归纳了影响水下新老混凝土界面粘接性能的关键因素，综述了当下该粘结剂的主要类型及研究进展。展望了水下新老混凝土界面粘结剂的主要发展趋势和方向，认为“自愈粘结剂”对未来开发新型高效的水下新老混凝土界面粘结剂具有重要意义。

【关键词】新老混凝土；水下粘结；界面粘结剂；粘接性能；建筑修复

自催化邻苯二甲腈树脂的研究进展

李帅杰，刘彩召，孙明明，张绪刚，李坚辉，张    斌

(黑龙江省科学院石油化学研究院，黑龙江  哈尔滨    150040)

【摘 要】邻苯二甲腈树脂是一类具有优异综合性能的热固性树脂，在航空航天、船舶制造、电子封装等使用环境苛刻的领域中有着广泛的应用需求。然而邻苯二甲腈树脂本身固化非常缓慢，设计合成自催化邻苯二甲腈树脂分子结构是一种有效的解决方式。本文将自催化邻苯二甲腈归纳为酚羟基、氨基、仲胺、席夫碱、咪唑、苯并噁嗪、烷烃、马来酰亚胺和自由基等九大类，分别综述了不同类型树脂近几年的研究进展情况，并对自催化邻苯二甲腈树脂今后的发展趋势进行了展望。

【关键词】自催化；邻苯二甲腈树脂；分子结构；固化机理

有机硅胶粘剂老化研究进展

杨智慧^1,2，史浩伯³，刘晓宇³，田伟智³，王远榕^1,2，姜振浩^1,2，覃珊珊^1,2，卢海峰^1,2

（1.山东大学化学与化工学院，山东  济南    250100；2.山东省先进有机硅材料与技术重点试验室，山东  济南    250100；3.北京星航机电装备有限公司，北京    100074)

【摘  要】有机硅胶粘剂由于其对特殊材料的高粘接力、高可渗透性等独特性能，在航天、制造业、机械加工等领域得到广泛应用。然而，有机硅胶粘剂在氧气、湿度、水分等环境条件下容易发生老化降解，使其失去使用价值。对有机硅胶粘剂的老化过程进行深入研究，对于设备长期使役老化寿命预测至关重要。本文系统综述了有机硅胶粘剂的老化机理，并总结了近年来国内外对有机硅胶粘剂在人工加速老化领域的研究进展，旨在为有机硅胶粘剂的寿命评价及延寿提供参考价值，最后对未来发展进行了展望。

【关键词】有机硅；胶粘剂；老化；寿命预测

有机硅胶粘剂加速老化与自然老化的相关性研究

毕骁毅，安靖怡，李子阳，储甜甜，张孝阿，张军营

（北京化工大学，碳纤维及功能高分子教育部重点实验室，材料科学与工程学院，北京 100029）

【摘要】选取一种单组分有机硅胶粘剂在国内典型气候条件下的漠河和敦煌两个试验站进行了自然大气暴露试验，同时在实验室环境下进行了热空气老化、湿热老化、高低温交变老化和氙灯老化4种人工加速老化试验。通过测试老化后有机硅胶粘剂试样的拉伸强度、断裂伸长率和拉伸剪切强度3种力学性能，采用灰色关联分析的方法，计算了自然老化与各种人工加速老化之间的关联度，找出了退化趋势与自然老化最相似的加速老化条件，并用Pearson相关系数的方法进行了验证。进而进行了加速因子的计算，根据加速因子即可快速预测有机硅胶粘剂在自然老化过程中的性能退化规律。研究结果表明：以拉伸剪切强度的保留率为性能衰退指标时，氙灯老化试验与漠河和敦煌两个地区自然老化试验的相关性最大，关联度分别为0.92和0.95，加速因子分别为5.51和4.14。

【关键词】有机硅胶粘剂；自然老化试验；加速老化试验；灰色关联；加速因子

蓖麻油基聚氨酯改性聚丙烯酸酯压敏胶的制备及性能研究

朱  冲，王宝兰，刘亦曾，马宇彤，佘静丽，李盛彪

（华中师范大学化学学院，湖北武汉  430079）

【摘 要】以丙烯酸异辛酯、丙烯酸、丙烯酸羟乙酯为原料，合成了丙烯酸酯聚合物及相应的压敏胶，探讨了有关软硬单体添加量对压敏胶性能的影响。以蓖麻油、聚丙二醇、异佛尔酮二异氰酸酯以及丙烯酸羟乙酯为原料，分两步制得蓖麻油基聚氨酯丙烯酸酯预聚物（PUA）。采用化学改性法调节聚丙烯酸酯压敏胶的性能，结合紫外光固化技术，制备了基于蓖麻油的聚氨酯丙烯酸酯压敏胶，并对各步骤组分添加量、性能和结构进行分析。研究结果表明：⑴选择软硬单体比例为90：10时，聚丙烯酸酯压敏胶的性能相对最佳。⑵PUA预聚物反应中，当m(蓖麻油)∶m(聚丙二醇)=4∶6时，预聚物的性能相对最佳。⑶在制备基于蓖麻油的聚氨酯丙烯酸酯压敏胶时，通过对其180°剥离强度和持粘性的分析，得出蓖麻油基聚氨酯丙烯酸酯预聚物的相对最佳用量为3%。⑷探讨了双官能的活性稀释剂NPGDA添加量对固化后压敏胶性能的影响。从固化后黏度、凝胶率、180°剥离强度及持粘时间的情况来看，选择活性稀释剂的添加量为4%较为合适。⑸对改性后的压敏胶进行热稳定性分析，并对比改性前后的持粘性、180°剥离强度和固化时间。研究结果表明，改性后压敏胶具有较好的热稳定性，持粘时间、180°剥离强度以及固化时间都有了大幅进步。

【关键词】丙烯酸酯；压敏胶；UV固化；蓖麻油改性

在宽温度范围内具备低模量压敏胶的制备和性能研究

乔立根^1,2，巫  柯¹，白永平²

(1.广州鹿山新材料股份有限公司，广东广州  510530；2.哈尔滨工业大学化工与化学学院，黑龙江哈尔滨  150001)

【摘要】使用丙烯酸异辛酯(2-EHA)作为软单体，丙烯酸甲酯(MA)作为硬单体，4-羟基丁基丙烯酸酯缩水甘油醚(4-HBAGE)、丙烯酸羟乙酯(2-HEA) 作为官能单体，1,6-己二醇二丙烯酸酯(HDDA)作为内交联单体，醚化氨基树脂(L-109-65)作为热固化交联剂，采用溶剂法自由基连锁加聚工艺制得聚丙烯酸酯压敏胶。探讨了原胶配方中软硬单体的比例、HDDA的添加量、热固化交联剂的添加量对压敏胶性能、不同温度下弹性模量的影响。研究结果表明：⑴硬单体(MA)质量比的增加，会造成丙烯酸酯压敏胶的初粘力不断降低，持粘力不断增加，剥离强度先增加后降低；储能模量均随着样品温度的逐渐升高而逐渐降低。综合压敏胶性能和不同温度下的模量数据，选择软硬单体的质量比为89∶11较好。⑵当过氧化苯甲酸叔丁酯(TBPB，引发剂C)添加量为0.2%、HDDA添加量为0.3%时，制备的丙烯酸酯压敏胶的重均分子量（M_w）可以达到1.02×10⁶，数均分子量（M_n）可以达到3.10×10⁵。⑶探究了热固化交联剂添加量对压敏胶性能和不同温度下模量的影响，热固化交联剂的添加量选择0.45%（质量分数）为宜。⑷所制备的丙烯酸酯压敏胶在原胶拥有高分子量的同时，还能够兼顾较好的高温(80 ℃)持粘力，初粘力较好，剥离强度较高，是一款压敏性能优异、在宽温度范围内具备低模量的溶剂型丙烯酸酯压敏胶。

【关键词】丙烯酸酯压敏胶；低模量；高分子量；溶剂型

高性能双组分环氧铸工胶的研制

王冠璋，田学深，王德鹏，匡广际，姜    哲，杨    猛

（哥俩好新材料股份有限公司，辽宁  抚顺    113004）

【摘  要】选用双酚A型环氧树脂作为基料，酚醛胺等4种类型作为固化剂，配以高效促进剂（DMP-30）、铁粉及其他填料，制备出剪切强度高、耐介质性好的高性能双组分环氧铸工胶。重点考察了环氧树脂、固化剂、促进剂及铁粉对铸工胶性能的影响。研究结果表明：⑴随着环氧树脂E-44质量分数的增加，混合胶液的黏度不断提高，固化时间逐渐缩短，剪切强度随着E-44含量的增加先升后降，在质量分数为40%时剪切强度最大。本研究确定环氧树脂以E-44与E-51混合为主，E-44的质量分数在40%时相对最佳。⑵在其他组分用量不变的条件下，考察了脂环胺、聚酰胺、酚醛胺以及聚硫醇4种类型固化剂对胶液固化时间、硬度及剪切强度的影响，并考察了固化剂对胶液耐介质性的影响。研究结果表明，选用酚醛胺作为固化剂。⑶随着促进剂DMP-30添加量的增加，胶液的固化时间逐渐缩短，硬度逐渐变大，剪切强度则先增大后减小。本研究确定DMP-30的相对最佳添加量为4%。⑷随着3种（600、800、1 250目）铁粉添加量的提升，胶液的剪切强度均先增大后减小，其中1 250目铁粉提升胶液的剪切强度最为明显，并且在添加量为50%时达到峰值，最高剪切强度可达29 MPa。本研究确定铁粉的目数为1 250目，添加量为50%。

【关键词】双组分环氧；铸工胶；高剪切强度；耐介质性

聚硫橡胶和填料对耐冻融型桥梁加固用胶粘剂性能的影响

王苓力^1,2，宋承哲^1,2，孔靖勋¹，陆  波³

(1.辽宁省交通规划设计院有限责任公司，辽宁沈阳  110166；2.辽宁大通公路工程有限公司，辽宁沈阳  110111；3.沈阳化工大学，辽宁沈阳  110142）

【摘要】以双酚A环氧树脂、双酚F环氧树脂、活性稀释剂、聚硫橡胶、硅烷偶联剂、聚醚胺、改性脂环胺、酚醛胺、促进剂、硅微粉和白炭黑为原料配制成胶粘剂，用DSC法研究了固化剂对环氧树脂的固化反应的影响，进一步研究了聚硫橡胶、填料和环氧树脂NPEF-170对胶粘剂拉伸强度、弯曲强度、压缩强度、拉伸剪切强度等性能的影响。研究结果表明：⑴随着填料含量（40%~55%）的增加，当聚硫橡胶添加量为0份和10份时，胶粘剂的拉伸强度呈先降低后增加的趋势；当聚硫橡胶添加量为20份时，胶粘剂的拉伸强度呈现先增加后降低的趋势。因此当聚硫橡胶添加量为20份、填料含量为45%时，胶粘剂固化收缩减少，韧性增加，内应力减小，此时胶粘剂的拉伸强度最高（为38.7 MPa）。⑵当填料含量为40%和45%时，树脂含量较高，聚硫橡胶添加量对胶粘剂弯曲强度的影响比填料含量大；当填料含量为50%和55%时，树脂含量较低，聚硫橡胶添加量对胶粘剂的弯曲强度影响比填料含量小。⑶随着填料含量的增加，胶粘剂的压缩强度呈增加的趋势，但幅度不大；随着聚硫橡胶的添加，使得胶粘剂的压缩强度下降，对性能影响幅度较大，但在20份以内，压缩强度仍高于70 MPa。⑷当填料含量在45%时，胶粘剂的树脂含量较高，韧性较好，达到17.6~18.7 MPa，拉伸剪切强度较高。⑸冻融循环试验表明，有2个配方（A-1和A-2）满足JTG/T J22—2008和GB 50728—2011标准中的规定，即冻融循环试验前后强度降低的百分率不大于5%的要求。

【关键词】桥梁加固用胶粘剂；性能；耐冻融；聚硫橡胶；填料

建筑墙体环保装饰板用酯溶型复合胶粘剂的制备与性能测试

卢真琮¹，谢翔宇²，高  帅¹，李成尧¹，高  磊¹

（1.中建八局第一建设有限公司，山东济南  250100；

2.广州高新区投资集团有限公司，广东广州  510799）

【摘 要】以聚氨酯树脂、丙烯酸酯单体结合引发剂（CHP）、促进剂（TMTU）等主要材料，通过热溶解法制备了建筑墙体环保装饰板用酯溶型复合胶粘剂。选择异佛尔酮二异氰酸酯作为固化剂，测试了不同制备温度、引发体系的物质用量、引发剂用量、丙烯酸酯类单体/聚氨酯树脂比例、固化温度和固化剂含量等条件下，胶粘剂的拉伸剪切强度、绝对黏度、涂膜性能、固化时间、断面形貌、热稳定性等性能。研究结果表明：⑴制备温度在45~55 ℃之间，胶粘剂的制备效果相对最好。选择由CHP-TMTU共同组成的引发体系，当w(CHP)=5%、w(TMTU)=4%时，胶粘剂的拉伸剪切强度可达到6.48 MPa。⑵引发剂用量对胶粘剂的绝对黏度有显著影响，适当增加引发剂用量可以提高聚合反应速率和固含率，从而增加胶粘剂的黏度。⑶丙烯酸酯类单体/聚氨酯树脂比例对胶粘剂涂膜性能有显著影响，丙烯酸酯类单体的引入增加了交联度和硬段含量，从而提高了涂膜的硬度和耐冲击性。⑷固化温度和固化剂比例对胶粘剂的固化时间有明显的影响。添加固化剂后，胶粘剂具有更为韧性的断面特点，且胶粘剂在高温条件下表现出更高的热稳定性。

【关键词】建筑墙体；环保装饰板；酯溶型；胶粘剂；固化剂

脱硫胶粉复合SBS改性沥青的稳定化制备及其性能研究

景  杰¹，路永春²，吕弘煜²，丁明强²，王仕峰³

(1.甘肃公航旅建设集团有限公司，甘肃兰州  730099；2.甘肃公航旅低碳科技有限公司，甘肃兰州  730099；3.上海交通大学化学化工学院，上海  200240)

【摘  要】胶粉改性沥青作为优良的沥青路面热熔型粘结剂虽已得到推广应用，但仍存在加工黏度高、储存稳定性差等问题。本研究以储存稳定性及流变性能为指标，采用低门尼高溶胶含量的脱硫胶粉，控制胶粉与苯乙烯-丁二烯-苯乙烯共聚物（SBS）复配比例，优化加工工艺，制备了稳定型脱硫胶粉复合SBS改性沥青。探究了其加工性能、高温抗变形能力、热稳定性及延展性。研究结果表明：⑴通过溶凝胶试验和计算发现，脱硫胶粉的溶胶含量大幅提升，可以有效改善胶粉与沥青间相容性。当脱硫胶粉复合SBS后，可以看出沥青的黏度大幅提升。从加工性能角度来说，需要合理地控制SBS的复合用量，以保证改性沥青的拌合流动性。⑵基于高温性能评价的试验结果，20%脱硫胶粉+2%SBS、25%脱硫胶粉+2%SBS组合均具有良好的高温性能。⑶通过离析试验测定了48 h软化点差，分析了不同温度下车辙因子及相位角变化，基于脱硫胶粉改性沥青的储存稳定性考虑，推荐25%脱硫胶粉复配2%SBS的改性沥青方案。⑷从延展性出发，最终选择25%脱硫胶粉复配2%SBS的改性沥青方案。

【关键词】道路工程；橡胶沥青；流变性能；稳定性；脱硫胶粉；SBS

Research progress of interface binder for underwater old and new concrete

Ouyang Zengxin^1,2, Wu Qimin², Lin Zhonghua², Pei Kemei¹

(1. POWERCHINA Huadong Engineering Corporation Limited, Hangzhou 311221, Zhejiang, China; 2.School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou  310018, Zhejiang, China)

【Abstract】Interface binder for underwater old and new concrete is a new type of concrete interface binder suitable for underwater or humid environments. However, there are not many concrete binders that can truly play an ideal role underwater. Based on the particularity of the environment and the basic properties of concrete, the key factors that affect the interface bonding performance of underwater old and new concrete were summarized in this paper, and the main types and research progress of this binder at present were reviewed. The main development trends and directions of interface binders for underwater old and new concrete were prospected, and it was believed that "self-healing binder" was of great significance for the future development of new and efficient interface binders for underwater old and new concrete.

【Keywords】old and new concrete; underwater binding; interface binder; bonding performance; building restoration

Research progress of self-catalyzed phthalonitrile resin

Li Shuaijie, Liu Caizhao, Sun Mingming, Zhang Xugang, Li Jianhui, Zhang Bin

(Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin 150040,Heilongjiang, China)

【Abstract】Phthalonitrile resin is a kind of thermosetting resin with excellent comprehensive properties, which has a wide range of application requirements in the field of harsh environments such as aerospace, shipbuilding and electronic packaging. However, the curing of phthalonitrile resin itself is very slow, and designing and synthesizing the molecular structure of self-catalyzed phthalonitrile resin is an effective solution. In this paper, self-catalyzed phthalonitriles were divided into nine categories, such as phenolic hydroxyl group, amino group, secondary amine, Schiff base, imidazole, benzoxazine, alkane, maleimide and free radical. The research progress of different types of resins in recent years was reviewed, and the development trend of self-catalyzed phthalonitrile resin in the future was prospected.

【Keywords】self-catalyzed; phthalonitrile resin; molecular structure; curing mechanism

Research progress on aging of silicone adhesive

Yang Zhihui^1,2, Shi Haobo³, Liu Xiaoyu³, Tian Weizhi³, Wang Yuanrong^1,2, Jiang Zhenhao^1,2, Qin Shanshan^1,2, Lu Haifeng^1,2

(1.School of Chemistry and Chemical Engineering, Shandong University, Ji’nan 250100, Shandong, China; 2.Shandong Key Laboratory of Advanced Organo Silicon Materials and Technologies, Ji’nan    250100, Shandong China; 3.Beijing Xinghang Electromechanical Equipment Co., Ltd., Beijing    100074, China)

【Abstract】Silicone adhesive has been widely used in aerospace, manufacturing, mechanical processing, and other fields due to its unique properties such as high adhesion and high permeability to special materials. However, silicone adhesive is prone to aging and degradation under environmental conditions such as oxygen, humidity, and moisture, making it to lose its practical value. It is crucial to conduct in-depth research on the aging process of silicone adhesive for predicting the long-term service life of equipment. In this paper, the aging mechanism of silicone adhesive was systematically reviewed, and the research progress of silicone adhesive in the field of artificial accelerated aging both domestically and internationally in recent years was summarized. The aim was to provide reference value for the life evaluation and extension of silicone adhesive, and finally, the future development was prospected.

【Keywords】silicone; adhesive; aging; life prediction

Study on the correlation between accelerated aging and natural aging of silicone adhesive

Bi Xiaoyi, An Jingyi, Li Ziyang, Chu Tiantian, Zhang Xiaoa, Zhang Junying

（Key Laboratory of Carbon Fiber and Functional Polymers of Ministry of Education, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing  100029, China）

【Abatract】A single-component silicone adhesive was selected to carry out natural atmospheric exposure tests at two test stations in Mohe and Dunhuang under typical climatic conditions in China, and at the same time, four artificial accelerated aging tests, namely hot air aging, hydrothermal aging, high and low temperature alternating aging and xenon lamp aging, were conducted in laboratory environment. By testing three mechanical properties of silicone adhesive samples after aging, namely tensile strength, elongation at break and tensile shear strength, the grey correlation analysis method was used to calculate the correlation degree between natural aging and various artificial accelerated aging conditions. The accelerated aging conditions with the most similar degradation trend to natural aging were identified, and the Pearson correlation coefficient method was used to verify the results. Furthermore, the acceleration factor was calculated, and based on the acceleration factor, the performance degradation law of silicone adhesive during natural aging could be quickly predicted. The research results showed that when the retention rate of tensile shear strength was used as the performance degradation index, the correlation between xenon lamp aging test and natural aging test in Mohe and Dunhuang area was the highest, with correlation coefficients of 0.92 and 0.95, and acceleration factors of 5.51 and 4.14, respectively.

【Keywords】silicone adhesive; natural aging test; accelerated aging test; grey correlation; acceleration factor

Preparation and properties of castor oil-based polyurethane modified polyacrylate pressure sensitive adhesive

Zhu Chong, Wang Baolan, Liu Yizeng, Ma Yutong, She Jingli, Li Shengbiao

(College of Chemistry, Central China Normal University, Wuhan 430079, Hubei, China)

【Abstract】Acrylate polymer and corresponding pressure sensitive adhesive were synthesized by using 2-ethylhexyl acrylate, acrylic acid and hydroxyethyl acrylate as raw materials, and the effects of soft and hard monomer addition amount on the properties of pressure sensitive adhesives were investigated. Castor oil-based polyurethane acrylate prepolymer (PUA) was prepared in two steps by using castor oil, polypropylene glycol, isophorone diisocyanate and hydroxyethyl acrylate as raw materials. The performance of polyacrylate pressure sensitive adhesive was adjusted by using chemical modification method, combined with ultraviolet curing technology, castor oil-based polyurethane acrylate pressure sensitive adhesive was then prepared. The addition amounts of components in each step, as well as the performance and structure were analyzed. The research results showed that, ⑴ When the ratio of soft and hard monomers was 90:10, the performance of polyacrylate pressure sensitive adhesive was relatively optimal. ⑵ In the PUA prepolymer reaction, the performance of the prepolymer was relatively optimal when m(castor oil) : m(polypropylene glycol)=4:6. ⑶When preparing polyurethane acrylate pressure sensitive adhesive based on castor oil, the relative optimal dosage of castor oil-based polyurethane acrylate prepolymer was determined to be 3% through analysis of its 180° peel strength and holding power. ⑷ The effects of the addition amount of bifunctional reactive diluent NPGDA on the properties of cured pressure sensitive adhesive were explored. According to the viscosity after curing, gelation rate, 180° peel strength and adhesive holding time, 4% of reactive diluent was appropriate. (5) Thermal stability analysis on the modified pressure sensitive adhesive was conducted, and its holding power, 180° peel strength, and curing time before and after modification were compared. The research results indicated that the modified pressure sensitive adhesive had good thermal stability, with significant improvements in adhesion time, 180° peel strength and curing time.

【Keywords】acrylate; pressure sensitive adhesive; UV curing; castor oil modification

Preparation and properties of low modulus pressure sensitive adhesive in a wide temperature range

Qiao Ligen^1,2,Wu Ke¹, Bai Yongping²

Guangzhou Lushan New Materials Co., Ltd., Guangzhou510530, Guangdong, China; 2.School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin  150001, Heilongjiang, China)

【Abstract】Polyacrylate pressure sensitive adhesive was prepared by using 2-ethylhexyl acrylate (2-EHA) as the soft monomer, methyl acrylate (MA) as the hard monomer, 4-hydroxybutyl acrylate glycidyl ether (4-HBAGE) and hydroxyethyl acrylate (2-HEA) as the functional monomers, 1,6-hexanediol diacrylate (HDDA) as the internal crosslinking monomer, etherified amino resin (L-109-65) as the thermosetting crosslinking agent through solvent-based free radical chain addition polymerization process. The effects of the ratio of soft and hard monomers in the original adhesive formula, the addition amount of HDDA, and the addition amount of thermosetting crosslinking agent on the pressure sensitive adhesive performance and elastic modulus at different temperatures were explored. The research results showed that, ⑴ The increase in the mass ratio of hard monomer (MA) would cause a continuous decrease in the tack of acrylic pressure sensitive adhesive, an increase in holding power, and first an increase in peel strength followed by a decrease. The storage modulus gradually decreased as the sample temperature increased. Based on the comprehensive performance of pressure sensitive adhesive and modulus data at different temperatures, a mass ratio of 89:11 for soft and hard monomers was selected preferably. ⑵ When the addition amount of tert-butyl peroxybenzoate (TBPB, initiator C) was 0.2% and the addition amount of HDDA was 0.3%, the weight average molecular weight (M_w) of the prepared acrylic pressure sensitive adhesive could reach 1.02×10⁶, and the number average molecular weight (M_n) could reach 3.10×10⁵. ⑶ The effects of the addition amount of thermosetting crosslinking agent on the properties of pressure sensitive adhesive and modulus at different temperatures were investigated. The appropriate addition amount of thermosetting crosslinking agent was 0.45% (mass fraction). ⑷ The prepared acrylic pressure sensitive adhesive not only had high molecular weight in the original adhesive, but also had good high-temperature (80 ℃) holding power, good initial tack, and high peel strength, which was a solvent-based acrylic pressure sensitive adhesive with excellent pressure sensitive performance and low modulus in a wide temperature range.

【Keywords】acrylic pressure sensitive adhesive; low modulus; high molecular weight; solvent type

Development of high performance two-component epoxy casting adhesive

Wang Guanzhang, Tian Xueshen, Wang Depeng, Kuang Guangji, Jiang Zhe, Yang Meng

(Gleihow New Materials Co., Ltd., Fushun 113004, Liaoning, China)

【Abstract】A high performance two-component epoxy casting adhesive with high shear strength and good medium resistance was prepared by using bisphenol A-type epoxy resin as the base material, four types of curing agents including phenolic amine, combined with efficient accelerator (DMP-30), iron powder, and other fillers. The effects of epoxy resin, curing agent, accelerator, and iron powder on the properties of casting adhesive were investigated. The research results showed that, ⑴ As the mass fraction of epoxy resin E-44 increased, the viscosity of the mixed adhesive solution continued to increase, the curing time gradually shortened, and the shear strength first increased and then decreased with the increase of E-44 content. The shear strength reached its maximum at a mass fraction of 40%. It was determined in this study that the epoxy resin was mainly mixed with E-44 and E-51, and the mass fraction of E-44 was relatively optimal at 40%. ⑵ Under the condition of constant dosage of other components, the effects of four types of curing agents, namely cyclic amine, polyamide, phenolic amine and polythiol on the curing time, hardness and shear strength of the adhesive solution were investigated, and the effects of curing agents on the medium resistance of the adhesive solution were also examined. The research results indicated that phenolic amine was chosen as the curing agent. ⑶ As the addition amount of accelerator DMP-30 increased, the curing time of the adhesive solution gradually shortened, the hardness gradually increased, and the shear strength first increased and then decreased. It was determined in this study that the relatively optimal addition amount of DMP-30 was 4%. ⑷ With the increase of the addition amount of three types of iron powder (600, 800, 1 250 mesh), the shear strength of the adhesive solution first increased and then decreased. Among them, 1 250 mesh iron powder had the most significant effect on improving the shear strength of the adhesive solution, and reached its peak at an addition amount of 50%, with the highest shear strength reaching 29 MPa. It was determined in this study that the mesh size of iron powder was 1 250 and the addition amount was 50%.

【Keywords】two-component epoxy; casting adhesive; high shear strength; medium resistance

Influence of polysulfide rubber and filler on the properties of freeze-thaw resistant adhesive for bridge reinforcement

Wang Lingli^1,2, Song Chengzhe^1,2, Kong Jingxun¹, Lu Bo³

(1.Liaoning Provincial Transportation Planning and Design Institute Co., Ltd., Shenyang 110166, Liaoning, China; 2.Liaoning Datong Highway Engineering Co., Ltd., Shenyang  110111, Liaoning, China; 3.Shenyang University of Chemical Technology, Shenyang  110142, Liaoning, China)

【Abstract】Adhesive was prepared by using bisphenol A epoxy resin, bisphenol F epoxy resin, reactive diluent, polysulfide rubber, silane coupling agent, polyetheramine, modified cyclic amine, phenolic amine, accelerator, silica micro powder, and fumed silica as raw materials. The effects of curing agents on the curing reaction of epoxy resin were studied by using DSC method, and the effects of polysulfide rubber, filler, and epoxy resin NPEF-170 on the tensile strength, bending strength, compressive strength, tensile shear strength, and other properties of the adhesive were further investigated. The research results showed that, ⑴ As the filler content (40%-55%) increased, the tensile strength of the adhesive showed a trend of first decreasing and then increasing when the addition amount of polysulfide rubber was 0 and 10 parts, respectively. When the addition amount of polysulfide rubber was 20 parts, the tensile strength of the adhesive showed a trend of first increasing and then decreasing. Therefore, when the addition amount of polysulfide rubber was 20 parts and the filler content was 45%, the curing shrinkage of the adhesive decreased, the toughness increased, and the internal stress decreased. At this time, the tensile strength of the adhesive was the highest (38.7 MPa). ⑵ When the filler content was 40% and 45%, the resin content was relatively high, and the effects of the addition amount of polysulfide rubber on the bending strength of the adhesive were greater than that of the filler content. When the filler content was 50% and 55%, the resin content was relatively low, and the effects of the addition amount of polysulfide rubber on the bending strength of the adhesive were smaller than that of the filler content. ⑶ With the increase of filler content, the compressive strength of the adhesive showed an increasing trend, but the magnitude was not significant. With the addition of polysulfide rubber, the compressive strength of the adhesive decreased, which had a significant impact on its performance. However, within 20 parts, the compressive strength was still higher than 70 MPa. ⑷ When the filler content was 45%, the resin content of the adhesive was relatively high, the toughness was good, reaching 17.6-18.7 MPa, and the tensile shear strength was high. ⑸ The freeze-thaw cyclic test showed that two formulas (A-1 and A-2) met the requirements of JTG/T J22-2008 and GB 50728-2011 standards, which stipulated that the percentage of strength reduction before and after the freeze-thaw cyclic test should not exceed 5%.

【Keywords】adhesive for bridge reinforcement; property; freeze-thaw resistant; polysulfide rubber; filler

Preparation and performance testing of ester-soluble composite adhesive for environmentally friendly decorative panel on building wall

Lu Zhencong¹, Xie Xiangyu², Gao Shuai¹,Li Chengyao¹, Gao Lei¹

(1.The First Company of China Eighth Engineering Bureau Ltd., Ji’nan 250100, Shandong, China;2.Guangzhou Hi-Tech Investment Group Co., Ltd., Guangzhou  510799, Guangdong, China)

【Abstract】A ester-soluble composite adhesive for environmentally friendly decorative panel on building wall was prepared by thermal dissolution method using main materials such as polyurethane resin, acrylic monomer, combined with initiator (CHP), and accelerator (TMTU). Isophorone diisocyanate was selected as the curing agent, and the tensile shear strength, absolute viscosity, coating film properties, curing time, cross-sectional morphology, thermal stability, and other properties of the adhesive were tested under different preparation temperatures, mass amounts of initiator system, amounts of initiators, proportions of acrylic monomer/polyurethane resin, curing temperatures, and curing agent contents. The research results showed that, ⑴ The preparation temperature was between 45-55 ℃, and the preparation effect of the adhesive was relatively good. When choosing the initiation system composed of CHP-TMTU, the tensile shear strength of the adhesive could reach 6.48 MPa when w(CHP)=5% and w(TMTU)=4%. ⑵ The amount of initiator had a significant impact on the absolute viscosity of the adhesive. Increasing the amount of initiator appropriately could improve the polymerization reaction rate and solid content, thereby increasing the viscosity of the adhesive. ⑶ The proportion of acrylic monomer/polyurethane resin had a significant impact on the performance of adhesive coating film. The introduction of acrylic monomer increased the crosslinking degree and hard segment content, thereby improving the hardness and impact resistance of the coating film. ⑷ The curing temperature and curing agent ratio had a significant impact on the curing time of the adhesive. After adding the curing agent, the adhesive had a more resilient cross-sectional characteristic, and the adhesive exhibited higher thermal stability under high temperature conditions.

【Keywords】building wall; environmentally friendly decorative panel; ester soluble; adhesive; curing agent

Stabilized preparation and properties of modified asphalt by desulfurized rubber powder composite SBS

Jing Jie¹, Lu Yongchun²,Lyu Hongyu², Ding Mingqiang², Wang Shifeng³

(1.GHATG Construction Group, Lanzhou 730099, Gansu, China;2.Gansu HATG Low Carbon Technology Co., Ltd., Lanzhou 730099, Gansu, China; 3.School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai  200240, China)

【Abstract】Although rubber powder modified asphalt has been widely used as an excellent hot melt binder for asphalt pavement, there are still problems such as high processing viscosity and poor storage stability. In this study, focusing on the storage stability and rheological properties, using low Mooney and high sol content desulfurized rubber powder, controlling the composite ratio of rubber powder to styrene-butadiene-styrene copolymer (SBS), and optimizing the processing technology, desulfurized rubber powder composite SBS modified asphalt was prepared stably. Its processing performance, high-temperature deformation resistance, thermal stability, and ductility were explored. The research results showed that, ⑴ Through the sol-gel test and calculation, it was found that the sol content of desulfurized rubber powder was significantly increased, which could effectively improve the compatibility between rubber powder and asphalt. When desulfurized rubber powder was compounded with SBS, it could be seen that the viscosity of asphalt was significantly increased. From the perspective of processing performance, it was necessary to reasonably control the composite content of SBS to ensure the mixing flowability of modified asphalt. ⑵ Based on the test results of high-temperature performance evaluation, the combination of 20% desulfurized rubber powder + 2% SBS and 25% desulfurized rubber powder + 2% SBS both had good high-temperature performance. ⑶ The 48 hour softening point difference was determined through segregation test, and the changes in rutting factor and phase angle at different temperatures were analyzed. Based on the storage stability of desulfurized rubber powder modified asphalt, a modified asphalt scheme of 25% desulfurized rubber powder compounded with 2% SBS was recommended. ⑷ Starting from ductility, the modified asphalt scheme of 25% desulfurized rubber powder compounded with 2% SBS was ultimately chosen.

【Keywords】road engineering; rubberized asphalt; rheological performance; stability; desulfurized rubber powder; SBS