防弹复合材料用树脂基体胶粘剂研究进展

李  鹏，郭学彬，张积财，曹书良，葛慧宪，张  涛

（中纺新材料科技有限公司，天津  301700）

【摘 要】随着防弹复合材料在多领域的广泛应用，树脂基体作为其关键组成成分，其性能对材料防护效能的提升具有决定性影响。本文系统梳理了环氧树脂、酚醛树脂、聚氨酯树脂、丙烯酸酯树脂及聚酰胺树脂等多种典型树脂基体在防弹复合材料中的应用实践及其性能特征。认为不同树脂基体通过改性技术的持续优化，在力学性能、界面结合强度、耐环境适应性及能量吸收效率等方面既展现出显著优势，亦存在特定局限性。最后对防弹复合材料用树脂基体胶粘剂的未来发展进行展望。相信伴随新型树脂基体的研发突破与复合材料设计理念的革新，未来研究将更聚焦于树脂与增强材料间的协同增效机制，着力推动防弹材料向轻量化、多功能集成及环境友好型方向发展，以精准响应动态演变的防护应用需求。

【关键词】防弹复合材料；树脂基体；胶粘剂；防弹性能

中国及主要贸易国/地区食品接触材料及制品用黏合剂法规标准分析

潘静静¹，丘尽花¹，侯英梁²，尹  琴¹，钟怀宁¹，朱  云²，陈  胜¹

（1.广州海关技术中心，广东广州  510623；2.农夫山泉股份有限公司，浙江杭州  310024）

【摘  要】本文系统梳理了中国及主要贸易伙伴国/地区（欧盟、德国、美国）关于食品接触材料及制品用黏合剂的法规标准体系。通过深入解析各国具体法规要求——涵盖管理机制、产品分类、许可物质清单、生产过程规范、限量指标设定及产品信息标识等核心要素，并基于对黏合剂中高关注物质的重点筛查，针对性地为原料生产企业、黏合剂制造企业及终端使用企业提供了合规性实践指引。同时，前瞻性地探讨了食品接触材料及制品用黏合剂领域未来在合规管理及安全评估方面的发展趋势。

【关键词】食品接触材料及制品；黏合剂；法规标准；国际贸易；合规

新型无色透明环氧胶粘剂的研制

朱宸廷，虞鑫海，于克波，武海朋

（东华大学化学与化工学院，上海  201620）

【摘 要】通过调整3种环氧树脂（双酚AF环氧树脂、双酚A环氧树脂和有机硅改性环氧树脂）在胶粘剂体系中的比例以及环氧固化剂的比例，成功制备了多种透明的环氧胶粘剂体系（JQD-1~JQD-4）。对其温度-凝胶化时间、黏度、电学性能以及固化反应动力学、紫外-可见光透过率等进行了系统研究，优化了配方及制备工艺。研究结果表明：⑴4个配方的环氧胶粘剂的黏度均随着温度的升高而降低。其中加入少量有机硅改性环氧树脂的配方体系的黏度上升幅度较大。⑵温度是影响凝胶化时间的主要因素，温度升高会显著缩短环氧胶粘剂的凝胶化时间。双酚AF环氧树脂中三氟甲基使得JQD-1的凝胶化时间则相对较长。另外，环氧固化剂QCA-48995能够有效提升胶粘剂体系的反应活性，使胶凝化时间明显缩短。⑶通过引入双酚AF环氧树脂和有机硅改性环氧树脂对双酚A环氧树脂进行复合改性，有效提高了活化能，延长了凝胶化时间。试验数据的线性拟合结果表明，该固化过程符合阿伦尼乌斯行为特征，可为优化环氧胶粘剂的固化工艺参数提供理论依据。⑷4种配方的环氧胶粘剂在不同频率下的电容和介电损耗均表现出稳定性。⑸4种配方的环氧胶粘剂在-60~90 ℃区间范围内的剪切强度均大于10 MPa，其中JQD-3与JQD-4在低温到130 ℃温度测试区间基本符合耐热性的要求。⑹4种配方的环氧胶粘剂的吸水率在0.073%~0.697%之间，均具有优异的疏水性能。双酚AF环氧树脂相比传统的双酚A环氧树脂，通常具有更好的耐水性。⑺4种配方的环氧胶粘剂均表现出优异的无色透明性，其中JQD-3的透光率表现最佳，达到91.42%。⑻综合而言，JQD-3胶粘剂的各项性能比其他配方更优异，这些特性构成了一个较为合理的配方，使其在应用上展现出广阔的前景。

基于正交试验的CR/SBS复合改性沥青制备及性能研究

商红发¹，樊    亮^2,4，申全军¹，任海庆^3,4，李永振^2,4，毕  飞^2,4

（1.山东高速集团有限公司创新研究院，山东  济南   250014；2.山东省交通科学研究院，山东  济南   250102；3.山东建筑大学，山东  济南   250101；4.高速公路养护技术交通行业重点实验室，山东  济南   250102）

【摘 要】选取不同的活化胶粉掺量、SBS掺量和油胶比，采用五因素四水平的正交试验，基于针入度、软化点、延度和弹性恢复等指标，通过均值和极差等综合分析得到了双螺杆活化胶粉/苯乙烯-丁二烯-苯乙烯嵌段共聚物（CR/SBS）复合改性沥青的相对最佳配方。通过温度扫描、多应力蠕变恢复试验、低温弯曲蠕变及荧光显微观测等试验，将其与不同掺量的活化胶粉单一改性沥青（CR30%和CR40%）、SBS改性沥青和70号基质沥青进行对比分析，以评价其性能。研究结果表明：⑴通过正交试验均值和极差分析，得到了CR/SBS复合改性沥青的最优配方：活化胶粉掺量为30%，SBS掺量为2.5%，油胶比为1：6。⑵最优配方下的CR/SBS复合改性沥青相较其他4种沥青，具有更高的复数剪切模量和车辙因子、更小的相位角、更宽的PG分级温度范围，综合性能相对最佳。⑶采用活化胶粉和SBS对沥青进行复合改性时，活化胶粉颗粒与SBS相结合使橡胶聚合物的连续性层叠网状结构更加紧密，使沥青具有更好的高温抗变形和低温抗开裂能力。

【关键词】正交试验；活化胶粉；改性沥青；流变特性；SBS改性沥青

层压板用胶粘剂的研制

田学深，匡广际，夏令明，王冠璋，王德鹏，杨  猛

（哥俩好新材料股份有限公司，辽宁抚顺   113004）

【摘  要】采用混合双酚A型环氧树脂（E-51与E-44）与甲基丙烯酸为原料合成乙烯基树脂，并通过系统优化苯乙烯用量、促进剂用量、滑石粉用量及偶联剂选型，成功制备出具有高剪切强度与高热变形温度特性的层压胶。研究结果表明：⑴随着环氧树脂E-51质量分数的增加，层压胶的硬度和热变形温度逐渐上升，剪切强度先升后降，质量分数为60%时相对最佳，此时粘接层压板的力学性能优异且符合相关标准。本研究确定环氧树脂以E-44与E-51混合为主，E-51的质量分数为60%时相对最佳。⑵随着苯乙烯添加量的增加，层压板内层强度保持率先升高后下降。当苯乙烯添加量为35%时，胶粘剂交联程度相对最高，粘接的层压板浸油后内层强度保持率超过80%。最终确定苯乙烯添加量为35%时相对最佳。⑶随着促进剂异辛酸钴和N,N-二甲基邻甲苯胺（DMA）添加量的增加，层压胶操作时间逐渐缩短，且低温条件下的固化不受影响。本研究确定异辛酸钴和DMA的添加量分别为1.0%和1.2%时，层压胶兼具适中的操作时间与良好的低温操作性能。⑷随着滑石粉添加量的增加，层压板的收缩率逐渐下降，力学性能先增大后减小。本研究确定滑石粉添加为30%时相对最佳。⑸偶联剂的引入可有效降低层压板的水分含量与电导率。通过对3种硅烷偶联剂的对比研究，结果表明KH-570在降低水分含量和电导率方面表现最为显著。本研究确定选用KH-570作为复合体系的偶联剂。

【关键词】层压板；胶粘剂；乙烯基树脂；力学性能；性能稳定

金属结构复材粘接修理的喷砂表面处理工艺研究

杨海龙^1,2，谢金标^1,2,3，周  健^1,2，刘  鹏^1,2，孙运刚^1,2，宣善勇^1,2

（1.国营芜湖机械厂，安徽芜湖 241007；2.安徽省航空复合材料维修工程技术研究中心，安徽芜湖  241007；3.清华大学，北京 100084）

【摘  要】针对狭窄区域内金属结构复合材料粘接修理的表面处理工艺，本文通过实施多样化的表面处理方法对粘接修理工艺进行探索。研究对比了打磨、喷砂和偶联剂等多种表面处理手段，并深入分析了不同表面处理工艺参数下的粘接性能表现。进一步从表面形貌特征、接触角大小以及粗糙度等级等多个维度，剖析了表面处理工艺对提升粘接性能的内在机理。在此基础上，对表面处理工艺进行了优化，以提高粘接质量。研究结果表明：⑴相较未经处理的表面，喷砂处理粗糙度存在显著差异，而打磨工艺对表面粗糙度的提升效果相对有限。经喷砂工艺处理后的表面粗糙度呈先增后减的趋势。⑵采用过小或过大的喷砂目数进行表面处理均不利于粘接质量的提升。适中的喷砂目数能够在保证胶粘剂充分浸润的同时，形成良好的机械啮合作用，从而最大化提高粘接性能。⑶随着喷砂目数的增加，材料表面的接触角呈现先减小后增大的变化趋势。⑷喷砂处理工艺能够实现更优异的粘接性能，随喷砂目数增大，剪切强度先增大后减小。在采用高喷砂压力配合30目喷砂粒度的表面处理工艺时，可获得最高的剪切强度（达30.2 MPa）。⑸成功获得了一组经优化的表面处理工艺参数，适用于狭窄区域内的金属结构复合材料粘接修理。本研究的结果为金属结构复合材料粘接修理工艺的优化提供了依据。

【关键词】复合材料粘接修理；金属结构；胶粘剂；表面处理；喷砂；偶联剂

聚氨酯结构胶在新能源汽车动力电池包中的粘接性能研究
刘永军，王  宁，保玉环，张明杰，杨博文，王  帅

(比亚迪汽车有限公司，陕西西安  710100)

【摘 要】针对新能源汽车动力电池包中塑料-金属异质材料连接的技术需求，本研究系统探究了聚氨酯结构胶粘接性能的关键影响因素。通过设计拉伸剪切、垂直拉拔及加速老化试验，重点揭示了基材表面特性、胶层厚度、环境温度及湿热老化对粘接强度的影响规律。研究结果表明：⑴基材表面微观结构对粘接强度具有显著影响。透明PET因表面粗糙度较高，结合等离子表面处理后，其粘接强度可进一步提升至14.05 MPa，增幅达16.69%，表明表面粗糙度优化可有效提高粘接强度。⑵胶层厚度对粘接强度呈现非线性影响，当胶层厚度为0.5 mm时，试样的拉伸剪切强度和垂直拉拔强度接近且最大，分别达到14.2和15.7 MPa；胶层厚度为3.0 mm时，拉伸剪切强度下降47.89%，而对垂直拉拔强度的影响则明显较小。⑶温度影响性分析表明，聚氨酯结构胶在常规使用温度下，较低的环境温度能够保证拥有更好的粘接强度，但过低的温度（0℃以下）将会明显影响其拉伸剪切强度。高温环境对于异种材料的粘接界面，由于热膨胀系数差异，可能存在较大的热应力，导致粘接性能下降。⑷老化试验揭示，在高温高湿环境下，试样的拉伸剪切强度呈现显著下降趋势。在冷热冲击环境下，试样的拉伸剪切强度并无明显衰减，且低温环境（-25℃）下放置的试样在经过1 000 h老化后，性能存在27.95%的提升。⑸综上，建议聚氨酯结构胶在实际应用中优先选用表面粗糙化PET基材，辅以等离子处理工艺，严格控制胶层厚度（≤0.5 mm），并针对服役环境选择配套防护策略以提升耐久性。

【关键词】聚氨酯结构胶；动力电池包；粘接强度；湿热老化；等离子体处理

一种超支化聚氨酯树脂的合成及其在聚氨酯导热灌封胶中的应用

廖哲慧，方章建，李桂妃

(广东普赛达材料科技股份有限公司，广东东莞  523646）

【摘 要】本文采用聚丙二醇(PPG2000)、4,4´-二苯基甲烷二异氰酸酯（MDI）和硼酸为原料，制备了一种超支化聚氨酯树脂，使用这种超支化聚氨酯树脂制备了一种超支化聚氨酯导热灌封胶。研究了超支化聚氨酯不同R值、不同硼酸值、灌封胶配方中不同超支化树脂含量、不同填料含量对灌封胶力学性能及导热性能的影响。研究结果表明：⑴超支化聚氨酯导热灌封胶的剪切强度和断裂伸长率与R值有密切关系，当R值为1.8时，粘接剪切强度最大，断裂伸长率最小。⑵超支化树脂中硼酸添加量的增加，对导热灌封胶力学性能有重要影响。⑶导热灌封胶中超支化树脂的含量对粘接剪切强度和断裂伸长率也有较大影响，当超支化树脂含量为12%时，剪切强度达到最大值。⑷导热填料用量对灌封胶力学、电学及导热性能有明显的影响，填料的适宜最大填充量应控制在75%左右。此时，灌封胶具有较好的热稳定性。

【关键词】聚氨酯灌封胶；导热性能；超支化聚氨酯

基于环氧结构胶固化性能的涂装车间烘房特性研究

李 娇¹，刘清松²，钟海平²，张 玲³，李 佳³

(1.重庆工业职业技术大学化学与制药工程学院，重庆 401120；2.重庆长安汽车股份有限公司，重庆400023；3.重庆工业职业技术大学电气工程学院，重庆 401120)

【摘 要】为提升汽车车身制造中环氧树脂结构胶的粘接性能，本文通过分析不同烘烤温度和时间下粘接接头强度的变化趋势与接头断裂形貌，以判断接头失效形式。探究了不同烘烤固化工艺条件对车身钣金粘接接头性能的影响。研究结果表明：⑴170 ℃烘烤20 min时，接头强度达到峰值27.74 MPa，断裂形式近乎100%胶层内聚破坏，表明胶层均匀固化，粘接性能较佳。⑵烘烤温度过高或过低时，受胶层降解和固化不充分的影响，均会导致粘接接头强度下降。同时结合某汽车涂装车间烘房的炉温跟踪测试，发现实际生产中烘烤温度分布不均，导致部分区域结构胶固化不足，增加了车辆运行中结构胶脱胶的风险。⑶优化烘房设计与气流管理，以及提高胶粘剂的温度适应性，是确保结构胶在实际生产中稳定性能的关键。⑷基于模糊PID控制算法的温度调控，可实现对烘房温度的精确控制，确保温度在165～175 ℃范围内稳定运行，以满足汽车车身用结构胶烘烤固化的工艺要求。

【关键词】环氧树脂；结构胶；固化工艺；涂装烘房

自修复微胶囊改性水性丙烯酸装饰涂层及性能验证

叶 芬¹，周泽龙²

(1.九州职业技术学院，江苏徐州 221116；2.徐州建滔能源有限公司，江苏徐州 221700）

【摘 要】为解决建筑外墙表面涂层的裂纹、裂缝问题，本文创新性地将微胶囊自修复技术引入水性丙烯酸建筑涂料体系，通过KH-560型硅烷偶联剂改性二氧化钛，提升涂层的抗紫外老化性能和表面硬度。同时，通过原位聚合法制备丙烯酸树脂微胶囊，提高涂层的耐候性和动态损伤修复能力。重点探讨了自修复微胶囊添加量对涂层性能（如光泽度、色差、表面粗糙度、耐紫外老化性能以及自修复性能）的影响。研究结果表明：⑴自修复微胶囊添加量对涂层光泽度影响显著。在0~6%范围内，自修复微胶囊添加量可使涂层光泽度提升，6%时涂层光泽度达到峰值47.8 GU。为保证这种自修复丙烯酸涂层良好的光泽度，自修复微胶囊添加量不宜超过6%。⑵当自修复微胶囊添加量为4%或6%时，与未添加自修复微胶囊的空白涂层相比，涂层的色差变化相对良好。⑶随着自修复微胶囊添加量的增加，涂层粗糙度不断增大，抗冲击性能提高。当自修复微胶囊添加量为10%时，涂层的抗冲击力最大，为7 kg/cm。⑷适量自修复微胶囊的添加有助于提高涂层的耐紫外老化性能和裂缝自修复性能。当自修复微胶囊添加量为6%时，涂层在耐紫外老化试验前后的色差较小，为5.69，且涂层的划痕宽度变化率最大，达到31.06%。⑸本试验制备的自修复涂层表现出良好性能，可为建筑外墙修复提供新思路。

【关键词】丙烯酸涂层；自修复；微胶囊；光泽度；抗冲击力

Research progress on resin matrix adhesive for bulletproof composite materials

Li Peng, Guo Xuebin, Zhang Jicai, Cao Shuliang, Ge Huixian, Zhang Tao

(CTA Hi-Tech Textiles Co., Ltd., Tianjin 301700, China)

【Abstract】With the widespread application of bulletproof composite materials in various fields, resin matrix, as its key component, had a decisive impact on the improvement of material protection effectiveness. The application practices and performance characteristics of various typical resin matrices, such as epoxy resin, phenolic resin, polyurethane resin, acrylic resin, and polyamide resin, in bulletproof composite materials were systematically reviewed in this article. It was believed that through continuous optimization of modification technology, different resin matrices showed significant advantages in mechanical properties, interfacial bonding strength, environmental adaptability, and energy absorption efficiency, but also had specific limitations. Finally, the future development of resin matrix-based adhesive for bulletproof composite materials was discussed. It was believed that with the breakthrough in the research and development of new resin matrices and the innovation of composite material design concepts, future research would focus more on the synergistic mechanism between resins and reinforcement materials, and strive to promote the development of bulletproof materials towards lightweight, multifunctional integration, and environmentally friendly directions, in order to accurately respond to the dynamic evolution of protective application needs.

【Keywords】bulletproof composite material; resin matrix; adhesive; bulletproof performance

Analysis of regulatory standards for adhesives used in food contact materials and products in China and major trading countries/regions

Pan Jingjing¹, Qiu Jinhua¹, Hou Yingliang², Yin Qin¹,Zhong Huaining¹, Zhu Yun², Chen Sheng¹

(1. Guangzhou Customs Technology Center, Guangzhou510623, Guangdong, China;

2. Nongfu Spring Co., Ltd., Hangzhou 310024, Zhejiang, China)

【Abstract】The regulatory standard system for adhesives used in food contact materials and products in China and major trading partner countries/regions (EU, Germany, USA) was systematically reviewed in this article. Through in-depth analysis of specific regulatory requirements in various countries, including management mechanisms, product classification, permitted substance lists, production process standards, limit indicator settings, and product information labeling, and based on the key screening of high concern substances in adhesives, targeted compliance practice guidelines were provided for raw material production enterprises, adhesive manufacturing enterprises, and end use enterprises. Meanwhile, the future development trends in compliance management and safety assessment in the field of adhesives for food contact materials and products were prospectively explored.

【Keywords】food contact material and article; adhesive; regulatory standard; international trade; compliance

Development of new colorless and transparent epoxy adhesive

Zhu Chenting, Yu Xinhai, Yu Kebo, Wu Haipeng

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

【Abstract】Multiple transparent epoxy adhesive systems (JQD-1~JQD-4) were successfully prepared by adjusting the proportion of three types of epoxy resin (bisphenol AF epoxy resin, bisphenol A epoxy resin, and silicone modified epoxy resin) in the adhesive system and the proportion of epoxy curing agent. The temperature-gel time, viscosity, electrical properties, curing reaction kinetics, UV visible light transmittance, etc. were systematically studied, and the formulation and preparation process were optimized. The research results showed that, ⑴The viscosity of four formulations of epoxy adhesive decreased with increasing temperature. The viscosity of the formula system with a small amount of silicone modified epoxy resin added had a significant increase. ⑵Temperature was the main factor affecting the gel time, and the increase of temperature significantly shortened the gel time of epoxy adhesive. The gel time of JQD-1 was relatively long due to trifluoromethyl in bisphenol AF epoxy resin. In addition, the epoxy curing agent QCA-48995 could effectively enhance the reactivity of the adhesive system, significantly reducing the gel time. ⑶Bisphenol A epoxy resin was modified by introducing bisphenol AF epoxy resin and silicone modified epoxy resin, which effectively increased the activation energy and prolonged the gel time. The linear fitting results of the experimental data indicated that the curing process conformed to the Arrhenius behavior characteristics, which could provide a theoretical basis for optimizing the curing process parameters of epoxy adhesive. ⑷Four formulations of epoxy adhesive showed stability in capacitance and dielectric loss at different frequencies. ⑸The shear strength of four formulations of epoxy adhesive was greater than 10 MPa in the temperature range of -60~90 ℃. Among them, JQD-3 and JQD-4 basically met the requirements of heat resistance in the temperature test range from low temperature to 130 ℃. ⑹The water absorption rate of four formulations of epoxy adhesive ranged from 0.073% to 0.697%, and all had excellent hydrophobic properties. Bisphenol AF epoxy resin usually had better water resistance compared to traditional bisphenol A epoxy resin. ⑺Four formulations of epoxy adhesive all exhibited excellent colorless transparency, with JQD-3 showing the best transmittance of 91.42%. ⑻Overall,the various properties of JQD-3 adhesive were superior to other formulations, and these characteristics constituted a relatively reasonable formulation that demonstrated broad prospects in its application.

【Keywords】bisphenol AF epoxy resin; epoxy adhesive; colorless and transparent epoxy adhesive; preparation; property

Preparation and performance study of CR/SBS composite modified asphalt

based on orthogonal experiment

Shang Hongfa¹, Fan Liang^2,4, Shen Quanjun¹, Ren Haiqing^3,4,Li Yongzhen^2,4, Bi Fei^2,4

(1.Shandong Hi-Speed Group Innovation Research Institute, Ji'nan 250014, Shandong, China; 2.Shandong Transportation Institute, Ji'nan  250102, Shandong, China; 3.Shandong Jianzhu University, Ji'nan  250101, Shandong, China; 4.Key Laboratory of Expressway Maintenance Technology, Ministry of Transport, Ji'nan  250102, Shandong, China）

【Abstract】By selecting different amounts of activated rubber powder, SBS content, and oil/rubber ratio, the five-factor four-level orthogonal experiment was conducted based on indicators such as penetration, softening point, ductility, and elastic recovery, and the relative optimal formula for twin-screw activated rubber powder/styrene-butadiene-styrene block copolymer (CR/SBS) composite modified asphalt was obtained through comprehensive analysis of mean and range. Through temperature scanning, multi stress creep recovery test, low-temperature bending creep, and fluorescence microscopy observation, it was compared and analyzed with activated rubber powder single modified asphalt (CR30% and CR40%) with different dosages, SBS modified asphalt, and matrix asphalt No. 70 to evaluate its performance. The research results showed that, ⑴The optimal formula for CR/SBS composite modified asphalt was obtained through mean and range analysis of orthogonal experiment: activated rubber powder content was 30%, SBS content was 2.5%, and oil/rubber ratio was 1:6. ⑵ The CR/SBS composite modified asphalt under the optimal formula had higher complex shear modulus and rutting factor, smaller phase angle, and wider PG grading temperature range compared to other four types of asphalt, and its comprehensive performance was relatively the best. ⑶When using activated rubber powder and SBS for composite modification of asphalt, the combination of activated rubber powder particles and SBS made the continuous layered network structure of rubber polymer more compact, resulting in better high-temperature deformation resistance and low-temperature cracking resistance of asphalt.

【Keywords】orthogonal experiment; activated rubber powder; modified asphalt; rheological property; SBS modified asphalt

Development of adhesive for laminated board

Tian Xueshen, Kuang Guangji, Xia Lingming, Wang Guanzhang, Wang Depeng, Yang Meng

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

【Abstract】Ethylene based resin was synthesized by using a mixture of bisphenol A-type epoxy resin (E-51 and E-44) and methyl acrylic acid as raw materials. Through systematic optimization of styrene content, promoter content, talc powder content, and coupling agent selection, the laminated adhesive with high shear strength and high thermal deformation temperature characteristics was successfully prepared. The research results showed that, ⑴ As the mass fraction of epoxy resin E-51 increased, the hardness and thermal deformation temperature of laminated adhesive gradually increased, and the shear strength first increased and then decreased. When the mass fraction was 60%, it was relatively optimal, and the mechanical properties of the bonded laminated board were excellent and met relevant standards. This study determined that the epoxy resin was mainly composed of the mixture of E-44 and E-51, with the optimal mass fraction of E-51 being 60%. ⑵ As the amount of styrene added increased, the strength of the inner layer of laminated board first increased and then decreased. When the amount of styrene added was 35%, the crosslinking degree of adhesive was relatively highest, and the strength retention rate of the inner layer of the bonded laminated board after immersion in oil exceeded 80%. The final determination was that the addition of styrene was relatively optimal at 35%. ⑶ With the increase of accelerator cobalt isooctanoate and N,N-dimethyl-o-toluidine (DMA) added, the operation time of laminated adhesive gradually shortened, and the curing under low temperature condition was not affected. This study determined that when the addition amounts of cobalt isooctanoate and DMA were 1.0% and 1.2%, respectively, the laminated adhesive had both moderate operating time and good low-temperature operating performance. ⑷ As the amount of talc powder added increased, the shrinkage rate of laminated board gradually decreased, and the mechanical properties first increased and then decreased. This study determined that adding 30% talc powder was relatively optimal. ⑸ The introduction of coupling agent could effectively reduce the moisture content and conductivity of laminated board. By comparing three types of silane coupling agent, the results showed that KH-570 exhibited the most significant performance in reducing moisture content and conductivity. This study determined to use KH-570 as the coupling agent for the composite system.

【Keywords】laminated board; adhesive; vinyl resin; mechanical property; stable performance

Study on sandblasting surface treatment technology for bonding repair of metal structure composite materials

Yang Hailong^1,2,Xie Jinbiao^1,2,3, Zhou Jian^1,2, Liu Peng^1,2,Sun Yungang^1,2, Xuan Shanyong^1,2

(1.Wuhu State-Owned Factory of Machining, Wuhu 241007, Anhui, China; 2.Anhui Aeronautical Composite Maintenance Engineering Technology Research Center, Wuhu  241007, Anhui China; 3.Tsinghua University, Beijing  100084, China)

【Abstract】The surface treatment process for bonding repair of metal structure composite materials in narrow areas by implementing diverse surface treatment methods was explored in this article. Various surface treatment methods such as grinding, sandblasting, and coupling agents were studied and compared, and the bonding performance under different surface treatment process parameters was analyzed in depth. Furthermore, the intrinsic mechanism of surface treatment technology in improving bonding performance was analyzed from multiple dimensions such as surface morphology characteristics, contact angle size, and roughness level. On this basis, the surface treatment process was optimized to improve the bonding quality. The research results showed that, ⑴ Compared to untreated surface, sandblasting treatment had significant difference in roughness, while the improvement effect of grinding process on surface roughness was relatively limited. The roughness of the surface after sandblasting treatment showed a trend of first increasing and then decreasing. ⑵ Using too small or too large sandblasting mesh size for surface treatment was not conducive to improving the bonding quality. Moderate sandblasting mesh size could ensure sufficient wetting of the adhesive while forming good mechanical engagement, thereby maximizing the bonding performance.⑶ With the increase of sandblasting mesh size, the contact angle on the material surface showed a trend of first decreasing and then increasing. ⑷The sandblasting process could achieve better bonding performance. As the sandblasting mesh size increased, the shear strength first increased and then decreased. When using a surface treatment process with high sandblasting pressure and 30 mesh sandblasting particle size, the highest shear strength (up to 30.2 MPa) could be obtained. ⑸ A set of optimized surface treatment process parameters were successfully obtained, which were suitable for bonding repair of metal structure composite materials in narrow areas. The results of this study provided a basis for optimizing the bonding repair process of metal structure composite materials.

【Keywords】bonding repair of composite material; metal structure; adhesive; surface treatment; sandblasting; coupling agent

Study on bonding performance of polyurethane structural adhesive

in power battery pack of new energy vehicle

Liu Yongjun, Wang Ning, Bao Yuhuan, Zhang Mingjie, Yang Bowen, Wang Shuai

(BYD Auto Co., Ltd., Xi’an 710100, Shaanxi, China)

【Abstract】In response to the technical requirements for the connection of plastic-metal heterogeneous materials in power battery pack of new energy vehicle, the key influencing factors of bonding performance of polyurethane structural adhesive were systematically explored in this study. By designing tensile shear, vertical pull-out, and accelerated aging tests, the influence of substrate surface characteristics, adhesive layer thickness, ambient temperature, and hydrothermal aging on bonding strength was highlighted.The research results showed that, ⑴The microstructure of substrate surface had a significant impact on the bonding strength. Due to its high surface roughness, the bonding strength of transparent PET could be further improved to 14.05 MPa after plasma surface treatment, with an increase of 16.69%. This indicated that optimizing surface roughness could effectively improve the bonding strength. ⑵ The thickness of adhesive layer had a nonlinear effect on the bonding strength. When the thickness of adhesive layer was 0.5 mm, the tensile shear strength and vertical pull-off strength of the sample were close to the maximum, reaching 14.2 and 15.7 MPa, respectively. When the thickness of adhesive layer was 3.0 mm, the tensile shear strength decreased by 47.89%, while the effect on the vertical pull-off strength was significantly smaller. ⑶ The analysis of temperature influence showed that polyurethane structural adhesive could ensure better bonding strength at lower ambient temperature under conventional use temperature, but excessively low temperatures (below 0 ℃) would significantly affect its tensile shear strength. High temperature environment may result in significant thermal stress at the bonding interface of dissimilar materials due to differences in thermal expansion coefficients, leading to a decrease in bonding performance. ⑷The aging test revealed that under high temperature and high humidity conditions, the tensile shear strength of the sample showed a significant decreasing trend. Under cold and hot shock environment, there was no significant decrease in the tensile shear strength of the sample, and the sample placed in a low-temperature environment (-25 ℃) showed 27.95% improvement in performance after 1 000 hours of aging. ⑸ In summary,it was recommended to prioritize the use of surface roughened PET substrates for polyurethane structural adhesive in practical application, supplemented by plasma treatment process, strictly controlling the thickness of the adhesive layer (≤0.5 mm), and selecting corresponding protective strategies for service environment to enhance durability.

【Keywords】polyurethane structural adhesive; power battery pack; bonding strength;hydrothermal aging; plasma treatment

Synthesis of hyperbranched polyurethane resin and its application in polyurethane thermal conductive potting sealant

Liao Zhehui, Fang Zhangjian, Li Guifei

(Guangdong Pustar Material Technology Co., Ltd., Dongguan523646, Guangdong, China)

【Abstract】Using polypropylene glycol (PPG2000), 4,4'-diphenylmethane diisocyanate (MDI), and boric acid as raw materials, hyperbranched polyurethane resin was prepared in this article. Then hyperbranched polyurethane thermal conductive potting sealant was prepared by using this hyperbranched polyurethane resin. The effects of different R values, boric acid content, hyperbranched resin content, and filler content in the formulation of hyperbranched polyurethane on the mechanical and thermal conductivity properties of potting sealant were studied. The research results showed that, ⑴ Theshear strength and elongation at break of hyperbranched polyurethane thermal conductive potting sealant were closely related to the R value. When the R value was 1.8, the adhesive shear strength was the highest and the elongation at break was the lowest. ⑵Theincrease in the amount of boric acid added to hyperbranched resin had a significant impact on the mechanical properties of thermal conductive potting sealant. ⑶The content of hyperbranched resin in thermal conductive potting sealant also had a significant impact on the adhesive shear strength and elongation at break. When the content of hyperbranched resin was 12%, the shear strength reached its maximum value. ⑷ The amount of thermal conductive filler had a significant impact on the mechanical, electrical, and thermal conductivity properties of potting sealant. The appropriate maximum filling amount of filler should be controlled at around 75%. At this point, the potting sealant had good thermal stability.

【Keywords】polyurethane potting sealant; thermal conductivity; hyperbranched polyurethane

Study on the characteristics of baking room in the painting workshop

based on the curing performance of epoxy structural adhesive

Li Jiao¹,Liu Qingsong²,Zhong Haiping²,Zhang Ling³,Li Jia³

(1.School of Chemistry and Pharmaceutical Engineering, Chongqing Industry Polytechnic University, Chongqing 401120, China; 2.Chongqing Changan Automobile Co., Ltd., Chongqing  400023, China; 3.School of Electrical Engineering, Chongqing Industry Polytechnic University, Chongqing  401120, China)

【Abstract】In order to improve the bonding performance of epoxy resin structural adhesive in automobile body manufacturing, the strength variation trend and fracture morphology of bonding joint under different baking temperatures and time to determine the failure mode of joint were analyzed in this paper. The influence of different baking and curing process conditions on the bonding performance of car body sheet metal joint was explored. The research results showed that, ⑴ When baked at 170 ℃ for 20 min, the joint strength reached a peak of 27.74 MPa, and the fracture mode was almost 100% cohesive failure of the adhesive layer, indicating that the adhesive layer was uniformly cured and the bonding performance was good. ⑵When the baking temperature was too high or too low, the degradation of the adhesive layer and insufficient curing could lead to a decrease in the strength of the bonded joint. At the same time, combined with the temperature tracking test of the baking room in a certain automobile painting workshop, it was found that the temperature distribution during actual production was uneven, resulting in insufficient curing of structural adhesive in some areas, which increased the risk of structural adhesive delamination during vehicle operation. ⑶ Optimizing the design of the baking room and airflow management, as well as improving the temperature adaptability of the adhesive, were key to ensuring the stable performance of structural adhesive in actual production. ⑷ Based on the fuzzy PID control algorithm, temperature regulation could achieve precise control of the baking room temperature, ensuring stable operation within the temperature range of 165-175 ℃ to meet the process requirements for baking and curing of structural adhesive used in automobile bodies.

【Keywords】epoxy resin; structural adhesive; curing process; painting and baking room

Self-repairing microcapsule modified waterborne acrylic decorative coating

and performance verification

Ye Fen¹, Zhou Zelong²

(1.Jiuzhou Polytechnic, Xuzhou 221116, Jiangsu, China;

2.Xuzhou Jiantao Energy Co., Ltd., Xuzhou 221700, Jiangsu, China)

【Abstract】To solve the problem of cracks and fissures in the surface coating of building exterior walls, self-repairing microcapsule technology was innovatively introduced into the waterborne acrylic building coating system in this article. By modifying titanium dioxide with silane coupling agent KH-560, the anti UV aging performance and surface hardness of the coating were improved. At the same time, acrylic resin microcapsules were prepared by in-situ polymerization method to improve the weather resistance and dynamic damage repair ability of the coating. The influence of the addition amount of self-repairing microcapsule on the coating performance (such as glossiness, color difference, surface roughness, UV aging resistance, and self-repairing performance) was mainly explored. The research results showed that, ⑴ The addition of self-repairing microcapsules had a significant impact on the glossiness of the coating. Within the range of 0-6%, the addition of self-repairing microcapsules could improve the glossiness of the coating, with a peak glossiness of 47.8 GU at 6%. To ensure good glossiness of this self-repairing acrylic coating, the addition of self-repairing microcapsules should not exceed 6%. ⑵ When the amount of self-repairing microcapsules added was 4% or 6%, the color difference change of the coating was relatively good compared to the blank coating without self-repairing microcapsules added. ⑶ As the amount of self-repairing microcapsules added increased, the roughness of the coating continued to increase and the impact resistance improved. When the amount of self-repairing microcapsules added was 10%, the coating had the highest impact resistance, which was 7 kg/cm. ⑷ The addition of an appropriate amount of self-repairing microcapsules could help improve the UV aging resistance and crack self-repairing performance of the coating. When the self-repairing microcapsule dosage was 6%, the color difference of the coating before and after the UV aging resistance test was relatively small, at 5.69%, and the scratch width change rate of the coating was the largest, reaching 31.06%. ⑸ The self-repairing coating prepared in this experiment exhibited good performance and could provide new ideas for the repair of building exterior walls.

【Keywords】acrylic coating; self-repairing;microcapsule; glossiness; impact resistance