易加工双马来酰亚胺树脂的分子设计与应用

张丹丹，刘彩召，邢文旭，于鸿鑫，张  斌，孙明明

(黑龙江省科学院石油化学研究院，黑龙江 哈尔滨    150040)

【摘  要】本文系统综述了易加工双马来酰亚胺（BMI）树脂的最新研究进展，重点阐述了改善其加工性能的分子设计与复合改性策略。针对传统BMI树脂存在的熔点高、溶解性差、熔体黏度大及韧性不足等问题，通过在主链中引入柔性脂肪链段、大体积侧基（如芴基、酚酞结构）或功能基团（如DOPO），设计新型BMI单体，可有效降低结晶度、拓宽加工窗口、提升溶解性和韧性。同时，采用共混与共聚改性方法，包括与烯丙基化合物、二元胺扩链以及环氧树脂（EP）、氰酸酯（CE）、苯并噁嗪（BOZ）等其他高性能树脂复合，能够显著优化BMI树脂的熔体流动性、固化行为和综合性能。最后，对易加工BMI树脂的发展前景进行了展望，旨在为开发高性能、高工艺适应性的先进树脂基复合材料提供理论参考和技术指导。

【关键词】双马来酰亚胺树脂；加工性；分子设计；改性；进展

基于分子结构视角的双马来酰亚胺改性研究进展与展望

毕  瑞¹，陆佳莹¹，汪  显²，张雪平^1,2，范和平^1,2

[1.江汉大学，湖北武汉  430056；2.华烁电子材料（武汉）有限公司，湖北鄂州  436032]

【摘  要】双马来酰亚胺（BMI）作为关键的高性能树脂，在电子信息、航空航天等领域具有重要应用。但BMI多数仅能溶于有毒的强极性溶剂，且存在固化温度高、固化后脆性大等缺点，极大地限制其应用，因此对BMI的改性成为目前研究的重点。本文从分子结构设计角度出发，系统阐述了四类主要改性路径：二元胺扩链改性，通过降低交联密度与引入刚性基团实现韧性与耐热性的协同提升；桥键内扩链改性，借助不同桥键结构（如脂肪族、脂环族、芴基Cardo等）显著改善BMI溶解性与综合性能；功能性基团引入，通过N-取代、芳环取代或末端引入烯丙基、磷氧基、硅氧基等基团，定向赋予BMI阻燃、低介电、高韧性等特性；共聚/共混改性，利用多元协同效应，通过与环氧树脂、聚酰亚胺等复合，构建多组分交联网络，实现性能的集成优化。最后，在总结中指出当前改性研究中面临的性能平衡、工艺适配与环保性等挑战，并希望通过多重策略协同、生物基改性剂开发及绿色溶剂体系构建等途径，推动BMI在高端领域向高性能、多功能和可持续方向发展。

【关键词】双马来酰亚胺；分子结构；改性；二元胺；共聚

改性沥青多因素耦合老化机理及表征评价研究综述

徐 博¹，肖  凤^2,3，张浩明¹，王志祥^2,3

（1.广东省公路建设有限公司江罗分公司，广东广州  527423；2.广东交科技术研发有限公司，广东广州  510550；3.广东华路交通科技有限公司，广东广州  510420）

【摘  要】改性沥青在热、氧、紫外线及水分等多因素耦合作用下的老化行为，是决定沥青路面耐久性的关键。本文系统综述了其老化机理，阐述了热氧协同、光化学降解与水侵蚀等过程的相互作用。在表征方法方面，分析了四组分分析、光谱、色谱及显微技术等在揭示化学组分、分子结构与微观形貌演变中的应用与局限。研究指出，现有评价多基于高温、低温及疲劳等宏观性能，并逐步与微观表征相结合。然而，当前研究在模拟条件真实性、多因素协同机制的定量解析以及微观-宏观跨尺度关联方面仍显不足。未来需构建更贴近实际服役环境的耦合老化试验方法，从分子尺度深化机理认识，并建立统一的多尺度性能评价体系，从而为提升路面使用寿命提供理论依据与技术支撑。

【关键词】道路工程；改性沥青；多因素耦合老化；老化机理；老化评价

固化型丙烯酸酯压敏胶的制备与性能研究

宫  菲，薛  刚，张绪刚，孙明明，刘彩召，王  磊，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】针对传统压敏胶粘接强度有限，而高强度结构胶施工复杂的问题，本研究采用丙烯酸酯软、硬单体和含羧基官能单体，通过溶液聚合法合成丙烯酸酯压敏胶液。以乙酰丙酮铝（AlACA）作为交联剂，并引入环氧树脂和潜伏型固化剂，研制出一种固化型丙烯酸酯压敏胶。系统研究了各组分及工艺对其固化前压敏性能（初粘力、180°剥离强度、持粘力）与固化后高强度性能（剪切强度、90°剥离强度）的影响。研究结果表明：确定了较优质量配比为，m（丙烯酸酯压敏胶液）∶m（AlACA溶液）∶m（F-44型环氧树脂）∶m（潜伏型固化剂）=100∶1.5∶30∶1.5。在此配比下，固化型丙烯酸酯压敏胶在固化前后均表现出优异的粘接性能。该胶膜实现了无需外部加压的简易施工与高强度固化的结合，适用于对施工便捷性和粘接强度均有要求的领域。

【关键词】丙烯酸酯；压敏胶；热固化

耐电解液高性能丙烯酸酯压敏胶的研制

李铭杰，李健雄

（皇冠新材料科技股份有限公司，广东中山  528478）

【摘  要】针对锂离子电池用胶带在电解液环境中易失效的问题，本研究通过单因素试验，采用丙烯酸异辛酯（2-EHA）和甲基丙烯酸月桂酯（LMA）为长链软单体，甲基丙烯酸甲酯（MMA）为硬单体，甲基丙烯酸（MAA）和丙烯酸羟乙酯（HEA）为功能单体，甲基丙烯酸缩水甘油酯（GMA）为自交联单体，偶氮二异丁腈（AIBN）和过氧化二苯甲酰（BPO）为引发剂，乙酸乙酯为溶剂，制备了一款耐高温、耐电解液性能优异的溶剂型高性能丙烯酸酯压敏胶。系统探讨了长链软单体、功能单体、引发剂、自交联单体和固化剂的用量对压敏胶的黏度、180°剥离力、耐高温性能和耐电解液性能的影响。研究结果表明：对于耐电解液高性能丙烯酸酯压敏胶，长链软单体的用量、功能单体的用量对压敏胶的180°剥离力性能影响较大，自交联单体能显著提高压敏胶的内聚强度、耐高温和耐电解液性能。当长链软单体占比为79.5%、功能单体为4%、引发剂为0.6%、自交联单体为1.5%、固化剂为胶液质量的0.8%时，所制备的压敏胶综合性能较优，其黏度适中，180°剥离力为14.1 N/25 mm，并同时具备良好的耐高温性能与耐电解液性能。由上述高性能丙烯酸酯压敏胶制备的耐电解液胶带产品可应用于动力电池、储能电池、消费电子电池等产品，耐电解液性能达到电池产品的性能要求。

【关键词】丙烯酸酯；压敏胶；耐电解液；耐高温

聚硫醚橡胶的防霉功能化改性制备及应用研究

彭峪清，吴松华，秦蓬波

（北京航空材料研究院股份有限公司，北京  100095）

【摘  要】针对聚硫醚密封剂在湿热环境中易滋生霉菌的问题，本研究通过巯基-双键迈克尔加成反应，使用3-碘代-2-丙炔基氨甲酸丁酯（IPBC）防霉剂对聚硫醚橡胶进行功能化改性，合成了系列具有防霉官能团的聚硫醚生胶，并进一步制备了相应的防霉密封剂材料。系统考察了不同IPBC投料比对产物结构、分子量、力学性能及防霉性能的影响。研究结果表明：改性反应成功将防霉官能团引入到聚硫醚橡胶分子中；反应产物的分子量与投料配比直接相关；较高的IPBC防霉剂添加比例会造成聚硫醚密封剂的断裂伸长率下降；防霉功能化改性的生胶具有最佳的防霉效果，防霉等级为0级。该方法有效解决了传统物理添加方式中防霉剂分散性差、易迁移等问题，为高性能长效防霉密封剂的开发提供了新途径。

【关键词】聚硫醚橡胶；密封剂；防霉；功能化改性

不同化学体系热熔胶在平滑铝护套高压电缆中的适用性研究

陈嘉威¹，周 宏¹，周韫捷¹，邵  悦¹，李垠阅²，刘 英²

（1.国网上海市电力公司电缆分公司，上海  200072；2.西安交通大学电气工程学院，陕西西安  710049）

【摘  要】平滑铝护套高压交联聚乙烯电缆具有电气接触性能好、传输容量大、外径小、重量轻等优点，但在机械性能方面存在不足，需要通过热熔胶将铝护套和外护层（通常采用聚乙烯或聚氯乙烯材料）牢固粘接进行改善，因此，亟需开展针对电缆实际应用需求的热熔胶关键性能研究。本论文以初步筛选的4种不同化学体系的热熔胶为研究对象，首先进行红外光谱分析和热性能测试，确定基本成分和熔融温度；之后，将4种热熔胶应用于聚乙烯（PE）、聚氯乙烯（PVC）和铝片，制备粘接试样；最后，测试常温、90 ℃稳态温升及180 ℃短时温升条件下试样的T-剥离强度及拉伸剪切强度，据此分析4种热熔胶在分别采用PE和PVC外护层的平滑铝护套高压电缆中的适用性。研究结果表明：⑴PE热熔胶与PE材料相容性良好，其弹性模量约为316.0 MPa，熔点约为128 ℃，室温下T-剥离强度和拉伸剪切强度分别为3.39 N/mm和5.91 MPa，90 ℃稳态温升条件下分别下降为2.63 N/mm和2.31 MPa，180 ℃短时热处理后参数值略有升高，上述各项性能参数均满足采用PE外护层的平滑铝护套电缆应用需求。⑵在应用于PVC材料时，4种热熔胶的粘接效果均不佳，其中PEVA热熔胶的粘接性能在室温下相对最优，T-剥离强度为1.56 N/mm，拉伸剪切强度为3.05 MPa，但其熔融温度仅为58.84 ℃，仍无法满足电缆运行温度要求。⑶基于本文测试结果，对于平滑铝护套高压交联聚乙烯电缆的热熔胶选型建议为：采用PE外护层时，应优先选用高熔融温度的PE热熔胶，其在常温和暂态高温下均能保持优异的粘接强度与稳定性；采用PVC外护层时，则需进一步开发或寻找熔融温度更高、且与PVC极性相匹配的新型热熔胶体系。

【关键词】平滑铝护套高压电缆；热熔胶；粘接强度；热性能

风电混塔用环氧胶粘剂的触变体系优化研究

丁晓旭，薛雪雪，张  超，周洪芝，魏  莹，宋少波

(卡本科技集团股份有限公司，天津 300380)

【摘  要】触变体系影响了环氧胶粘剂搅拌后的密实程度，从而间接地影响到胶体最终的力学性能。为满足风电混塔用结构胶在低温施工下的高强要求，本文探究了疏水或亲水气硅搭配不同助剂后环氧胶粘剂的触变性能和力学性能变化。发现疏水气硅/消泡剂以及亲水气硅/流变助剂两种体系兼具较好的触变性和胶体压缩强度。此外，针对消泡剂和流变助剂的添加量进行了优化。最后，对比了各触变体系在热处理后的稳定性。研究结果表明：⑴疏水气相二氧化硅虽触变性优良，但高黏度易导致气泡缺陷，加入0.5%（质量分数，下同）消泡剂可显著提升压缩强度（>97 MPa）；⑵亲水气相二氧化硅体系结构更密实，但触变性较弱，添加0.7%流变助剂可提高其触变性能至与疏水体系相当；⑶助剂过量会降低性能，流变助剂可改善热稳定性。⑷综上，通过选择疏水气硅/消泡剂或亲水气硅/流变助剂复合体系，并控制助剂添加量，可有效平衡风电结构胶的施工性能、最终强度与高温贮存稳定性。

【关键词】环氧胶粘剂；触变性；气硅；助剂；热稳定性

多色系低红外发射率涂层的制备及性能表征

张伟钢，马雪萍，汤  颖，高  艺，曹彤彤

（滁州学院，安徽滁州 239000）

【摘 要】以聚氨酯（PU）为黏合剂，片状Al粉为低发射率填料，黄绿色浆、橙黄色浆和蓝紫色浆为调色剂，制备得到了绿色系、黄色系和蓝色系三种具有突出力学性能和低光泽性能的低红外发射率涂层。系统研究了黄绿色浆配比、橙黄色浆配比和蓝紫色浆配比对PU/Al复合涂层微结构、颜色特征、反射光谱、光学性能和力学性能的影响。研究结果表明：经不同色浆配比调控后的涂层可在绿色区间、黄色区间和蓝色区间产生强反射峰，从而可使涂层具备绿色系、黄色系和蓝色系颜色特征。经黄绿色浆调控后的绿色系PU/Al复合涂层的发射率和光泽度分别处于0.617~0.640和9.9~12.1范围内。经橙黄色浆调控后的黄色系PU/Al复合涂层的发射率和光泽度分别处于0.508~0.686和10.1~14.2范围内。经蓝紫色浆调控后的蓝色系PU/Al复合涂层的发射率和光泽度分别处于0.507~0.605和6.6~9.3范围内。不同色系的低红外发射率PU/Al复合涂层均具有优异的力学性能（附着力1级、柔韧性2 mm、耐冲击强度50 kg·cm）和红外隐身效果。所制备涂层在坦克、战车、通信车等各类陆上装备的迷彩伪装设计领域具有广阔的应用前景。

【关键词】多色系；涂层；红外发射率；力学性能；光泽度；红外隐身

Molecular design and application of easily processable bismaleimide resin

Zhang Dandan, Liu Caizhao, Xing Wenxu, Yu Hongxin, Zhang Bin, Sun Mingming

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

【Abstract】The latest research progress on easily processable bismaleimide (BMI) resin was systematically reviewed in this article, with a focus on molecular design and composite modification strategies to improve its processing performance. To address the issues of traditional BMI resin, such as high melting point, poor solubility, high melt viscosity, and insufficient toughness, novel BMI monomers were designed by introducing flexible aliphatic segments, bulky side groups (such as fluorenyl groups, phenolphthalein structures), or functional groups (such as DOPO) into the main chain, as well as designing new BMI monomer, which could effectively reduce the crystallinity, broaden the processing window, and enhance the solubility and toughness. Meanwhile, the use of blending and copolymerization modification methods, including compounding with allyl compounds, diamine chain extension, and other high-performance resins such as epoxy resin (EP), cyanate ester (CE), and benzoxazine (BOZ), could significantly optimize the melt flowability, curing behavior, and comprehensive performance of BMI resin. Finally, the development prospects of easily processable BMI resin were discussed, aiming to provide theoretical reference and technical guidance for the development of advanced resin-based composites with high performance and high process adaptability.

【Keywords】bismaleimide resin; processability; molecular design; modification; progress

Research progress and prospects of bismaleimide modification from the perspective of molecular structure

Bi Rui¹,Lu Jiaying¹, Wang Xian², Zhang Xueping^1,2, Fan Heping^1,2

[1. Jianghan University, Wuhan 430056, Hubei, China; 2.Haiso Electronic Materials (Wuhan) Ltd., Ezhou  436032, Hubei, China]

【Abstract】Bismaleimide (BMI), as a key high-performance resin, has significant applications in fields such as electronic information, aerospace, and others. However, most BMI resins can only dissolve in toxic, strongly polar solvents, and have drawbacks such as high curing temperature and high brittleness after curing, which greatly limit their application. Therefore, the modification of BMI has become a major focus of current research. From the perspective of molecular structure design, four main modification approaches were systematically elaborated in this paper. Diamine chain-extension modification achieved a synergistic improvement in toughness and heat resistance by reducing crosslinking density and introducing rigid groups. Bridge-bond internal chain-extension modification significantly improved the solubility and comprehensive properties of BMI through different bridge-bond structures (such as aliphatic, alicyclic, fluorenyl-basedCardo, etc.). Introduction of functional groups, such as N-substitution, aromatic ring substitution, or terminal introduction of allyl, phosphorus-oxygen, silicon-oxygen groups, imparted targeted properties to BMI such as flame retardancy, low dielectric constant, and high toughness. Copolymerization/blending modification utilized multi-component synergistic effect, constructing multi-component crosslinked networks by compounding with epoxy resins, polyimides, to achieve integrated optimization of performance. Finally, in the summary, it was pointed out that current modification research faced challenges such as balancing properties, process compatibility, and environmental friendliness. It was also expressed that through multiple synergistic strategies, the development of bio-based modifiers, and the construction of green solvent systems, BMI could be promoted towards high performance, multifunctionality, and sustainability in high-end fields.

【Keywords】bismaleimide; molecular structure; modification; diamine; copolymerization

A review on the multi-factor coupled aging mechanism of modified asphalt and its characterization evaluation

Xu Bo¹, Xiao Feng^2,3, Zhang Haoming¹, Wang Zhixiang^2,3

(1. Jiangluo Branch of Guangdong Provincial Highway Construction Co., Ltd., Guangzhou 527423, Guangdong, China; 2. Guangdong Transportation Science and Technology R&D Co., Ltd., Guangzhou  510550, Guangdong, China; 3. Guangdong Hualu Transport Technology Co., Ltd., Guangzhou 510420, Guangdong, China)

【Abstract】The aging behavior of modified asphalt under the coupled effects of multiple factors such as heat, oxygen, ultraviolet radiation, and moisture is crucial for determining the durability of asphalt pavement. Its aging mechanism was systematically reviewed in this article, and the interactions among processes such as thermal-oxidative synergism, photochemical degradation, and water erosion were elucidated. In terms of characterization methods, the application and limitations of four component analysis, spectroscopy, chromatography, and microscopy techniques in revealing chemical composition, molecular structure, and microstructural evolution were analyzed. Research indicated that existing evaluations were mostly based on macroscopic properties such as high temperature, low temperature, and fatigue, and were gradually combined with microscopic characterization. However, current research still showed deficiencies in simulating the authenticity of conditions, quantitatively analyzing the multi-factor synergistic mechanisms, and establishing micro-macro cross-scale correlations. In the future, it was necessary to establish a coupled aging test method that was more closely aligned with actual service environments, deepened mechanistic understanding at the molecular scale, and established a unified multi-scale performance evaluation system, in order to provide theoretical basis and technical support for enhancing the service life of pavements.

【Keywords】road engineering; modified asphalt; multi-factor coupled aging; aging mechanism; aging evaluation

Study on preparation and properties of curable acrylate pressure sensitive adhesive

Gong Fei, Xue Gang, Zhang Xugang, Sun Mingming, Liu Caizhao, Wang Lei, Li Jianhui, Zhang Bin

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

【Abstract】In response to the limited bonding strength of traditional pressure sensitive adhesive and the complex construction of high-strength structural adhesive, acrylate pressure sensitive adhesive solution was synthesized in this study through solution polymerization using acrylic soft and hard monomers and carboxyl functional monomers. A curable acrylate pressure sensitive adhesive was developed using aluminum acetylacetonate (AlACA) as the crosslinking agent and incorporating epoxy resin and latent curing agent. The effects of various components and processes on pressure sensitive properties before curing (initial tack, 180° peel strength, holding power) and high-strength properties after curing (shear strength, 90° peel strength) were systematically studied. The research results showed that the optimal mass ratio was determined as follows, m(acrylate pressure sensitive adhesive solution)∶m(AlACA solution)∶m(F-44 epoxy resin)∶m(latent curing agent)=100∶1.5∶30∶1.5. Under this ratio, the curable acrylate pressure sensitive adhesive exhibited excellent bonding properties before and after curing. This adhesive film achieved a combination of simple construction without external pressure and high-strength curing, suitable for fields that required both construction convenience and bonding strength.

【Keywords】acrylate; pressure sensitive adhesive; thermal curing

Development of electrolyte resistance high-performance acrylate pressure sensitive adhesive

Li Mingjie, Li Jianxiong

（Crown New Materials Technology Co., Ltd., Zhongshan  528478, Guangdong, China）

【Abstract】To address the issue of adhesive tape for lithium-ion battery easily failing in electrolyte environments, a solvent-based high-performance acrylate pressure sensitive adhesive with excellent high temperature resistance and electrolyte resistance was prepared in this study through single-factor experiments. The formulation included isooctyl acrylate (2-EHA) and lauryl methacrylate (LMA) as long-chain soft monomers, methyl methacrylate (MMA) as hard monomer, methacrylic acid (MAA) and hydroxyethyl acrylate (HEA) as functional monomers, glycidyl methacrylate (GMA) as self-crosslinking monomer, azobisisobutyronitrile (AIBN) and benzoyl peroxide (BPO) as initiators, and ethyl acetate as solvent. The effects of the dosage of long-chain soft monomers, functional monomers, initiators, self-crosslinking monomer, and curing agents on the viscosity, 180° peel force, high temperature resistance, and electrolyte resistance of pressure sensitive adhesive were explored systematically. The research results showed that for electrolyte resistance high-performance acrylate pressure sensitive adhesive, the amount of long-chain soft monomers and functional monomers had a significant impact on the 180° peel force performance of pressure sensitive adhesive. Self-crosslinking monomer could significantly improve the cohesive strength, high temperature resistance, and electrolyte resistance of pressure sensitive adhesive. When the proportion of long-chain soft monomers was 79.5%, the proportion of functional monomers was 4%, the initiators was 0.6%, the self-crosslinking monomer was 1.5%, and the curing agent was 0.8% of the adhesive solution mass, the comprehensive performance of the prepared pressure sensitive adhesive was excellent. Its viscosity was moderate, the 180° peel force was 14.1 N/25 mm, and it also had good high temperature resistance and electrolyte resistance. The electrolyte resistance adhesive tape product prepared from the high-performance acrylate pressure sensitive adhesive mentioned above could be applied to power batteries, energy storage batteries, consumer electronics batteries, and other products, meeting the performance requirements of battery products in terms of electrolyte resistance.

【Keywords】acrylate; pressure sensitive adhesive; electrolyteresistance; high temperature resistance

Research on the preparation and application of anti-mildew functionalized modification of polythioether rubber

Peng Yuqing, Wu Songhua, Qin Pengbo

(BAIMTEC Material Co., Ltd., Beijing 100095, China)

【Abstract】In response to the problem of mildew growth in polythioether sealant in hot and humid environments, through the Michael addition reaction of thiol-double bond, using 3-iodo-2-propynyl-butyl-carbamate (IPBC) fungicide to functionally modify polythioether rubber, a series of polythioether rubber with anti-mildew functional groups were synthesized, and corresponding anti-mildew sealant materials were further prepared. The effects of different IPBC feeding ratios on product structure, molecular weight, mechanical properties, and mildew resistance were systematically investigated. The research results showed that the modification reaction successfully introduced anti-mildew functional groups into the polythioether rubber molecules.The molecular weight of the reaction product was directly related to the feeding ratio.A higher proportion of IPBC fungicide added would result in a decrease in the elongation at break of the polythioether sealant.The raw rubber with anti-mildew functional modification exhibited the best anti-mildew effect, achieving an anti-mildew grade of 0.This method effectively solved the problems of poor dispersibility and easy migration of fungicide in traditional physical addition methods, providing a new approach for the development of high performance, long lasting anti-mildew sealant.

【Keywords】polythioether rubber; sealant; anti-mildew; functional modification

Applicability of hot melt adhesive with different chemical systems in smooth aluminum-sheathed high-voltage cables

Chen Jiawei¹, Zhou Hong¹, Zhou Yunjie¹, Shao Yue¹,Li Yinyue², Liu Ying²

(1. State Grid Shanghai Cable Company, Shanghai 200072, China; 2. School of Electrical Engineering, Xi’an Jiaotong University, Xi’an  710049, Shaanxi, China)

【Abstract】Smooth aluminum-sheathed high-voltage cross-linked polyethylene cables have advantages such as excellent electrical contact performance, large transmission capacity, small outer diameter, and light weight. However, they have deficiencies in mechanical properties, which need to be improved by firmly bonding the aluminum sheath to the outer protective layer (typically made of polyethylene or polyvinyl chloride) with hot melt adhesive. Therefore, there is an urgent need to conduct research on the key properties of hot melt adhesive tailored to the practical application requirements of cables. The preliminary screening of four different chemical systems of hot melt adhesive was focused in this paper. Firstly, infrared spectroscopy analysis and thermal performance testing were conducted to determine the basic components and melting temperature. Afterwards, four kinds of hot melt adhesive were applied to polyethylene (PE), polyvinyl chloride (PVC), and aluminum sheets to prepare adhesive samples. Finally, the T-peel strength and tensile shear strength of the samples were tested under normal temperature, steady-state temperature rise of 90 ℃, and short-term temperature rise of 180 ℃. Based on this, the applicability of four kinds of hot melt adhesive in smooth aluminum-sheathed high-voltage cables with PE and PVC outer protective layers was analyzed. The research results showed that, ⑴ PE hot melt adhesive had good compatibility with PE material, with the elastic modulus of about 316.0 MPa and the melting point of about 128 ℃. At room temperature, the T-peel strength and tensile shear strength were 3.39 N/mm and 5.91 MPa, respectively. Under steady-state temperature rise conditions at 90 ℃, they decreased to 2.63 N/mm and 2.31 MPa, respectively. After short-term heat treatment at 180 ℃, the parameter values slightly increased. All the above performance parameters met the application requirements of smooth aluminum-sheathed cables with PE outer protective layer. ⑵ When applied to PVC material, the bonding effects of all four kinds of hot melt adhesive were poor. Among them, PEVA hot melt adhesive had relatively the best bonding performance at room temperature, with the T-peel strength of 1.56 N/mm and the tensile shear strength of 3.05 MPa. However, its melting temperature was only 58.84 ℃, which still could not meet the temperature requirements for cable operation. ⑶ Based on the test results in this paper, the recommended selection of hot melt adhesive for smooth aluminum-sheathed high-voltage cross-linked polyethylene cables was: when using PE outer protective layer, high melting temperature PE hot melt adhesive should be preferred, which could maintain excellent bonding strength and stability at both room temperature and transient high temperature. When using PVC outer protective layer, it was necessary to further develop or search for a new type of hot melt adhesive system with higher melting temperature and matching PVC polarity.

【Keywords】smooth aluminum-sheathed high-voltage cable; hot melt adhesive; bonding strength; thermal performance

Research on optimization of thixotropic system of epoxy adhesive for hybrid wind generator tower

Ding Xiaoxu, Xue Xuexue, Zhang Chao, Zhou Hongzhi, Wei Ying, Song Shaobo

(Carbon Technology Group Co., Ltd., Tianjin300380, China)

【Abstract】The thixotropic system affects the compactness of epoxy adhesive after stirring, thereby indirectly influencing the final mechanical properties of the adhesive.In order to meet the high-strength requirements of structural adhesive for hybrid wind generator tower during low-temperature construction, the changes in the thixotropic and mechanical properties of epoxy adhesive with hydrophobic or hydrophilic fumed silica mixed with different additives were explored in this paper. It was found that both hydrophobic fumed silica/defoaming agent and hydrophilic fumed silica/rheological additive systems exhibited good thixotropy and adhesive compressive strength. In addition, the addition amounts of defoaming agent and rheological additive had been optimized.Finally, the stability of each thixotropic system after heat treatment was compared. The research results showed that, ⑴ Although hydrophobic fumed silica had excellent thixotropy, its high viscosity tended to cause bubble defects. Adding 0.5% (mass fraction, the same below) defoaming agent could significantly improve the compressive strength (>97 MPa).⑵ The structure of hydrophilic fumed silica system was denser, but its thixotropy was weaker. Adding 0.7% rheological additive could improve its thixotropic performance to be comparable to that of the hydrophobic system.⑶ Excessive additives could reduce performance, while rheological additives could improve thermal stability.⑷In summary, by selecting the composite system of hydrophobic fumed silica/defoaming agent or hydrophilic fumed silica/rheological additive, and controlling the amount of additives added, the workability, final strength, and high-temperature storage stability of structural adhesive for wind power could be effectively balanced.

【Keywords】epoxy adhesive; thixotropy; fumed silica; additive; thermal stability

Preparation and performance characterization of multi-color low infrared emissivity coating

Zhang Weigang, Ma Xueping, Tang Ying, Gao Yi, Cao Tongtong

(Chuzhou University, Chuzhou 239000, Anhui, China)

【Abstract】Three types of low infrared emissivity coating with outstanding mechanical properties and low gloss properties, namely green, yellow, and blue systems, were prepared by using polyurethane (PU) as the adhesive, flake Al powder as the low emissivity filler, and yellow-green colorant, orange-yellow colorant, and blue-purple colorant as toners.The effects of yellow-green colorant ratio, orange-yellow colorant ratio, and blue-purple colorant ratio on the microstructure, color characteristics, reflectance spectra, optical properties, and mechanical properties of PU/Al composite coating were systematically studied.The research results showed that after adjusting the ratio of different colorants, the coating could produce strong reflection peaks in the green, yellow, and blue ranges, thereby endowing the coating with green, yellow, and blue color characteristics.The emissivity and glossiness of the green PU/Al composite coating after being controlled by yellow-green colorant were in the range of 0.617-0.640 and 9.9-12.1, respectively.The emissivity and glossiness of the yellow PU/Al composite coating after being controlled by orange-yellow colorant were in the range of 0.508-0.686 and 10.1-14.2, respectively.The emissivity and glossiness of the blue PU/Al composite coating after being controlled by blue-purple colorant were in the range of 0.507-0.605 and 6.6-9.3, respectively.The low infrared emissivity PU/Al composite coating of different color systems had excellent mechanical properties (adhesion level of grade 1, flexibility of 2 mm, impact strength of 50 kg·cm) and infrared stealth effect.The prepared coating had broad application prospects in the camouflage design field of various land equipment such as tanks, combat vehicles, communication vehicles, etc.

【Keywords】multi-color; coating; infrared emissivity; mechanical property; glossiness; infrared stealth