环氧树脂纳米蒙脱土胶粘剂耐蚀性能研究

研究了水泥、蒙脱土(有机化和未有机化)和粉煤灰作为填料在环氧树脂胶粘剂涂层中的作用,讨论了不同填料对胶粘剂的耐蚀性能的影响。试验采用的腐蚀介质有自来水、氢氧化钠水溶液、氯化钠水溶液和盐酸溶液。试验结果表明加入有机化蒙脱土的环氧树脂胶粘剂,在无介质,强酸和强碱环境中,都具有较好的拉伸剪切强度。推荐了在不同介质条件下的胶粘剂的使用配方。     

三种环氧胶粘剂耐蚀性能研究

通过改变固化剂的种类(T-31和PA)、填料的种类(粉煤灰和纳米蒙脱土)配制了三种环氧胶粘剂,并通过不同的腐蚀介质来研究其耐蚀性能。实验采用的浸泡介质为机油、水、10%HCl水溶液、10%NaOH水溶液、3%NaCl水溶液。环氧胶粘剂的耐蚀性能是通过测定其拉伸剪切强度来评定的。推荐了三种胶粘剂适宜服役的腐蚀环境,为其在粘接领域的应用提供基础数据。     

纳米SiO_2改性环氧树脂胶粘剂的研究

选择纳米 SiO_2 作为增强材料改性环氧树脂基体, 以物理分散法将纳米 SiO_2 分散在环氧树脂中。通过力学性能测试和热稳定性能测试, 研究了不同含量的纳米 SiO_2 对改性环氧树脂胶粘剂的热性能、拉伸性能和冲击性能的影响; 通过 NOL环测试和扫描电子显微镜(SEM) 分析, 研究了不同含量的纳米 SiO_2 对国产芳纶纤维/改性环氧复合材料的界面性能和层间剪切强度的影响。实验结果表明, 基体树脂中当 w( 纳米SiO_2)=3%时, 改性环氧树脂胶粘剂的拉伸强度和冲击强度分别提高了 28.8%和 22.6%, 复合材料的层间剪切强度(ILSS) 达到最大值, 比未改性胶粘剂提高约 56.8%。     

环氧树脂／纳米蒙脱土胶粘剂耐蚀及耐磨性研究

通过正交试验研究了环氧树脂、固化剂、增韧剂、有机化纳米蒙脱土、偶联剂对环氧胶粘剂拉伸剪切强度的影响,并对所得配方的胶粘剂进行腐蚀和冲蚀磨损试验,由此推荐环氧树脂／纳米蒙脱土胶粘剂各组分的最佳加入量。     

环氧树脂/有机蒙脱土胶粘剂的制备及耐蚀性研究

采用有机蒙脱土对环氧树脂改性,制备了纳米有机蒙脱土/环氧树脂复合胶粘剂,同时用5因素3水平正交试验研究了关键参数对环氧树脂胶粘剂拉伸剪切强度的影响.结果表明,优化配制的新型胶粘荆有效地改善了界面的粘接性能.对胶粘剂的耐介质性能也进行了研究.     

桥梁填料工艺下的桥梁加固用环氧树脂胶粘剂性能研究

为了更好地验证桥梁加固用环氧树脂胶粘剂性能,现利用桥梁填料工艺,通过利用硅微粉、高岭土、膨润土、滑石粉、碳酸钙、水泥和粉煤灰7种不同桥梁填料配置环氧树脂胶粘剂,然后,将该胶粘剂分别放置在3种不同施工环境下,研究钢对钢拉伸剪切强度的具体影响,在此基础上,根据7种桥梁填料主要成分、密度以及环氧树脂的特点,全面分析钢对钢拉伸剪切强度的影响因素,并针对环氧树脂胶粘剂性能,选出合适的环氧树脂胶粘剂填料,以保证桥梁结构的稳定性、可靠性和安全性。结果表明,在桥梁填料工艺下,桥梁加固用环氧树脂胶粘剂具有良好的性能,被广泛地应用于桥梁结构的设计和优化中,为保证桥梁结构的坚固性和稳定性提供有力的保障。     

新型聚酰亚胺-环氧胶粘剂的制备及性能研究

在环氧树脂ES216中加入不同含量的新型聚酰亚胺粉末,制得胶粘剂。通过热失重分析、接触角、拉伸强度及凝胶化时间测试研究了聚酰亚胺用量对环氧胶性能的影响。结果表明,随着聚酰亚胺用量增加,环氧胶的耐热性、疏水性提高,拉伸剪切强度下降,表观活化能提高。聚酰亚胺的质量分数为15%时,胶粘剂的起始热分解温度378.4℃,表面能39.0 mJ/m2;拉伸剪切强度20.9 MPa;表观活化能58.5 kJ/mol,综合性能优良,增韧效果最好。     

填料对桥梁加固用环氧树脂胶粘剂性能的影响研究

考查7种不同填料(硅微粉、高岭土、膨润土、滑石粉、碳酸钙、水泥和粉煤灰)配方的环氧树脂胶粘剂在3种不同施工及固化环境下(空气中施工空气中固化,湿面环境施工水下固化及水下施工水下固化)钢对钢拉伸剪切强度的影响,结合7种填料的主要成分、密度和与环氧树脂的相容性,分析了影响3种环境下胶粘剂对钢对钢拉伸剪切强度影响的主要因素,提出针对不同施工及固化环境条件下,对应的粘接性能最好的环氧树脂胶粘剂填料。     

有机硅改性对环氧树脂固化物性能的影响研究

采用含有不同活性官能基团的硅烷偶联剂对双酚A环氧树脂E44进行物理或化学改性,并配以固化剂、促进剂及其他辅料制成有机硅改性单组分环氧胶粘剂。研究了不同种类、不同加入量的硅烷偶联剂对胶粘剂操作性和固化物的拉伸剪切强度、耐温性及抗冲击性的影响。结果表明,仲氨基化学改性环氧树脂所制得的单组分环氧在操作性、耐温性、韧性及拉伸剪切强度方面的综合性能最佳,当硅烷偶联剂加入量为15%时,改性单组分环氧树脂的综合性能最佳。     

胶粘剂大气腐蝕试验研究

本文论述九个牌号胶粘剂在我国五个气候区域,进行了6年大气腐蚀试验,同时还在广州市进行了贮存老化试验。用拉伸剪切强度,拉伸破坏时间和破坏类型等作为评定胶粘剂使用性能变化的测试指标,也观察了胶粘剂外观颜色和金属试片的腐蚀情况。试验结果表明,不同的气候条件对胶粘剂的性能变化影响很大。     

碳纤维布浸胶及与钢粘接用胶的性能研究

研究了用以浸碳纤维布的环氧胶及粘接浸胶碳布与钢的胶粘剂组成及粘接性能。发现高温性能主要取决于浸碳布胶,室温性能较好的胶,高温性能则明显偏低。制成了室温～250℃剪切强度都在10MPa以上,300℃为8～9MPa的浸碳布胶和粘接用胶。该胶具有不燃性、无烟,以及优异的耐烧蚀性能。     

不同腐蚀环境下FRP筋耐久性与寿命预测研究进展

针对纤维增强聚合物(FRP)筋体,综合分析了水溶液浸泡、盐溶液侵蚀,酸溶液和碱溶液,以及冻融等不同作用介质和作用方式下筋体的拉伸性能,归纳总结了FRP筋体拉伸强度演化规律.从FRP筋拉伸强度退化作用机理出发,以Arrhenius方程为基础,探讨了不同作用方式下FRP筋拉伸强度寿命预测模型方程的参数特征.     

功能型环氧树脂基防腐涂层的研究进展

环氧树脂涂层因其优异的耐蚀性能、对金属表面良好的附着力而在金属防腐领域得到广泛应用。但涂层固化过程中会形成缺陷和孔洞，腐蚀介质可以直接接触到金属表面。为了开发出具有优良耐久性的防腐涂层，研究人员使用不同的方法和材料制备了多种环氧树脂防腐涂层。该文综述了纳米粒子改性环氧防腐涂层、超疏水型环氧防腐涂层、自修复型环氧防腐涂层、导电聚合物改性环氧防腐涂层及生物基材料改性环氧防腐涂层的制备及性能。但这5种防腐涂层各有局限性，未来应该探究出新的环氧防腐涂层，在提升涂层防腐性能的同时，兼顾其他性能，使环氧树脂基防腐涂层朝着功能化、智能化的方向发展。     

Comparative study of zein- and gluten-based wood adhesives containing cellulose nanofibers and crosslinking agent for improved bond strength

Many of the currently used wood adhesives contain chemicals that are harmful to human health and the environment. Increasing environmental and human health concerns have made the development of safe biobased adhesives a priority. In this study, two plant proteins, i.e., zein and wheat gluten, were used to develop wood adhesives and their performance was compared through simple lap shear tests and plywood flexural/internal bond tests in dry and wet conditions. To increase their bond strength, cellulose nanofibers were added to create nanocomposite adhesives and glutaraldehyde was also used to crosslink the proteins. Single-lap shear test was performed to measure the bond strength of different adhesive formulations and determine the optimal formulations and processing conditions. Fractured bond surfaces were studied using optical observation and scanning electron microscopy to determine bond failure mechanisms. Thermal and chemical properties of the adhesives were evaluated using thermogravimetric analysis and Fourier transform infrared spectroscopy, respectively. The bond strength of both zein and gluten adhesives was significantly increased by the addition of the cellulose nanofibers and/or glutaraldehyde, although the two adhesives responded differently to the two reinforcement materials due to the different solvents used to prepare the adhesives. The bond failure mode changed from cohesive failure of the adhesive to structural failure of the adherent for the gluten adhesive containing CNFs and glutaraldehyde. Potential zein and gluten adhesive formulations were used to produce plywood samples and their performance was assessed under different conditions. The formulations with industrial potential were discovered through this study.     

海洋防腐领域中有机缓蚀剂的研究进展

海洋环境（海水、海洋大气和海泥）是条件极为严苛的自然腐蚀环境。船舶和海洋工程等长期服役在海洋环境中的钢铁结构体极易被腐蚀。有机缓蚀剂具有分子结构可设计性强、缓蚀效率高、作用时间长等优点，可有效阻止或减缓金属的腐蚀。因此，在海洋防腐涂料中添加有机缓蚀剂是提升其耐蚀性能的有效方法。该文结合国内外最新研究进展，综述了有机小分子缓蚀剂和聚合物缓蚀剂的特性及其在海洋防腐涂料中的应用，包括总结归纳各种有机缓蚀剂的分子结构和性能影响因素，分析有机缓蚀剂的表征手段和作用机制，讨论不同添加工艺对有机缓蚀剂在防腐涂料中的应用研究。最后，对有机缓蚀剂未来发展方向进行了展望。     

环保型水性聚氨酯复膜胶的开发及其在软包装中的应用

合成出不同结构的水性聚氨酯(WPU)复膜胶,以PET镀铝膜(VMPET)、双向拉伸聚丙烯(BOPP)和聚乙烯(PE)为复合薄膜,探讨了聚酯结构对WPU复膜胶粘接性能的影响,分析了异氰酸酯、水性固化剂和外加溶剂等对WPU复膜胶剥离强度和干燥速率的影响。结果表明:以混合聚酯、芳香族异氰酸酯为主要原料,配合水性固化剂,合成的WPU复膜胶对多种复合薄膜具有较好的粘接性能,其平均剥离强度达到3.48N/15mm;添加少量易挥发的无害溶剂,能够提高水性复膜胶的干燥速率,其最大复合速率达到110m/min,并且完全满足工业化的生产要求。     

Durability of Adhesive Bonds to Zinc-Coated Steels: Effects of Corrosive Environments on Lap Shear Strength

The effects of corrosive environments on adhesive bonds to electro-galvanized, zinc/aluminum alloy coated, coated electro-galvanized, and cold-rolled steels have been investigated. Bonds prepared using a rubber-modified dicyandiamide-cured epoxy adhesive, an epoxy-modified poly(vinyl chloride)-based adhesive, an acrylic-modified poly(vinyl chloride)-based adhesive a one-part urethane adhesive, and a two-component epoxy-modified acrylic adhesive were exposed under no-load conditions to constant high humidity or cyclic corrosion exposure for 50 days or 50 cycles (10 weeks) respectively.

Over the course of this study, exposure to constant high humidity had little effect on lap shear strength for any of the systems studied. Bond failures were initially cohesive, and with few exceptions remained so.

Bond strength retention under the cyclic corrosion exposure conditions employed was strongly dependent on adhesive composition and on substrate type. On galvanized substrates, lap shear strengths for the poly(vinyl chloride)-based adhesives were reduced by 90-100% during the course of the corrosion exposure, and a change in the mode of bond failure (from cohesive to interfacial) was observed. On the coated electro-galvanized steel substrate, the poly(vinyl chloride)-based adhesives showed about 50% retention in lap shear strength and a cohesive failure throughout most of the corrosion test. The dicyandiamide-cured epoxy adhesive used in this study generally showed the best lap shear strength retention to zinc-coated substrates; bonds to cold-rolled steel were severely degraded by corrosion exposure. The performance of the acrylic and urethane adhesives were intermediate to the dicyandiamide-cured epoxy and poly(vinyl chloride)-based adhesives in strength retention.     

Durability of Adhesive Bonds to Zinc-Coated Steels: Effects of Corrosive Environments on Lap Shear Strength

The effects of corrosive environments on adhesive bonds to electro-galvanized, zinc/aluminum alloy coated, coated electro-galvanized, and cold-rolled steels have been investigated. Bonds prepared using a rubber-modified dicyandiamide-cured epoxy adhesive, an epoxy-modified poly(vinyl chloride)-based adhesive, an acrylic-modified poly(vinyl chloride)-based adhesive a one-part urethane adhesive, and a two-component epoxy-modified acrylic adhesive were exposed under no-load conditions to constant high humidity or cyclic corrosion exposure for 50 days or 50 cycles (10 weeks) respectively.

Over the course of this study, exposure to constant high humidity had little effect on lap shear strength for any of the systems studied. Bond failures were initially cohesive, and with few exceptions remained so.

Bond strength retention under the cyclic corrosion exposure conditions employed was strongly dependent on adhesive composition and on substrate type. On galvanized substrates, lap shear strengths for the poly(vinyl chloride)-based adhesives were reduced by 90–100% during the course of the corrosion exposure, and a change in the mode of bond failure (from cohesive to interfacial) was observed. On the coated electro-galvanized steel substrate, the poly(vinyl chloride)-based adhesives showed about 50% retention in lap shear strength and a cohesive failure throughout most of the corrosion test. The dicyandiamide-cured epoxy adhesive used in this study generally showed the best lap shear strength retention to zinc-coated substrates; bonds to cold-rolled steel were severely degraded by corrosion exposure. The performance of the acrylic and urethane adhesives were intermediate to the dicyandiamide-cured epoxy and poly(vinyl chloride)-based adhesives in strength retention.     

环氧树脂胶粘剂的增韧填充改性

研究增韧剂、填料对环氧树脂胶粘剂剪切强度和冲击强度性能的影响。结果表明，随聚硫橡胶加入量的增加，剪切强度和冲击强度呈先增加然后降低的趋势。加入经偶联剂处理的石英粉，剪切强度和冲击强度都有很大的提高。加入二氧化锰后冲击强度提高约250％。