空心玻璃微珠填充固体浮力材料的制备及性能研究

以双酚A环氧树脂E51为基质原料,甲基四氢苯酐为固化剂,K25空心玻璃微珠为轻质填充物,采用模压成形的方法制备了空心玻璃微珠填充固体浮力材料。研究了玻璃微珠的填充率对体系粘度、浮力材料的密度、抗压强度及耐静水压件能的影响。结果表明,低密度空心微珠的引入,有效降低了固体浮力材料的密度,并且随着玻璃微珠填充量的增大,材料的理论计算密度与实际密度的偏差逐渐变大;浮力材料的单轴压缩强度和耐静水压强度随着空心玻璃微珠填充量的增大而降低,当玻璃微珠填充量超过18％时,材料性能下降幅度增大。     

空心玻璃微珠填充固体浮力材料的制备及性能研究

以双酚A环氧树脂E51为基质原料,甲基四氢苯酐为固化剂,K25空心玻璃微珠为轻质填充物,采用模压成形的方法制备了空心玻璃微珠填充固体浮力材料。研究了玻璃微珠的填充率对体系粘度、浮力材料的密度、抗压强度及耐静水压性能的影响。结果表明,低密度空心微珠的引入,有效降低了固体浮力材料的密度,并且随着玻璃微珠填充量的增大,材料的理论计算密度与实际密度的偏差逐渐变大;浮力材料的单轴压缩强度和耐静水压强度随着空心玻璃微珠填充量的增大而降低,当玻璃微珠填充量超过18%时,材料性能下降幅度增大。     

环氧树脂及环氧树脂基固体浮力材料吸水性研究进展

综述了国内外对环氧树脂及空心玻璃微珠填充环氧树脂基固体浮力材料吸水性的研究,分析了导致其吸水的各个影响因素。结果表明:造成吸水的原因是环氧树脂基固体浮力材料中存在的极性基团与自由体积以及环氧树脂和玻璃微珠界面间存在的间隙;可以通过改进环氧树脂的配方以及使用硅烷偶联剂活化空心玻璃微珠来降低固体浮力材料的吸水性。最后对环氧树脂基固体浮力材料的研究方向进行了展望。     

空心玻璃微珠填充环氧树脂复合材料力学性能

对不同填充质量比的改性空心玻璃微珠(HGB)/环氧树脂复合材料进行了拉伸、压缩准静态实验。研究了改性空心玻璃微珠不同填充量对复合材料密度、弹性模量、拉伸强度和压缩强度的影响, 并分析其应力松弛。实验发现, 材料的各项数据随填充比增加均有所降低。空心玻璃微珠的填入使材料表现出脆性破坏, 但破坏前有较大的变形, 破坏后回弹率大, 说明玻璃微珠的填充增强了材料的弹性。HGB/环氧树脂复合材料具有明显的应力松弛现象, 且填充比越高, 应力松弛速率越大, 可见HGB/环氧树脂复合材料具有明显的黏弹性。      

环氧树脂基固体浮力材料的制备及性能研究

实验采用低密度空心玻璃微珠(HGMS)填充脂环族环氧树脂E-4221制备固体浮力材料。讨论了环氧树脂E-4221体系的固化工艺制度和树脂体系配方对固化环氧树脂材料强度的影响,测得固化树脂产物压缩强度范围值100～150 MPa。分析了树脂配方以及玻璃微珠体积含量对最终固体浮力材料性能的影响,通过优化条件制备出抗压强度在40～70 MPa之间,密度范围在0.5～0.7 g/cm3,吸水率低于0.2%的固体浮力材料,最后对浮力材料的压缩断面做了简要分析。     

全海深浮力材料的研究与制备

选用缩水甘油醚型环氧树脂、芳香族多胺固化剂和空心玻璃微珠等原材料制备了低密度、高强度的全海深浮力材料,研究了低密度空心玻璃微珠K1的加入量对浮力材料的密度、单轴压缩强度、耐静水压强度和吸水率等性能的影响.结果表明,在空心玻璃微珠总体积分数为66.7％的全海深浮力材料中,加入适量空心玻璃微珠K1取代空心玻璃微珠HM42,...     

环氧树脂基复合泡沫材料的研究

以环氧树脂为基体,空心玻璃微珠为填充材料制备了具有高强度、低密度的复合泡沫材料。系统研究了固化剂用量,空心玻璃微珠的填充量、偶联剂的用量等对复合泡沫材料的力学性能的影响,并采用扫描电镜分析了复合泡沫材料的断口形貌。研究表明:随着空心玻璃微珠填充量的增大,复合泡沫材料的压缩强度和密度逐渐降低;偶联剂的加入能有效地改善环氧树脂与空心玻璃微珠之间的界面作用,从而提高力学性能。     

空心玻璃微珠对阻尼固体浮力材料力学性能影响研究

通过空心玻璃微珠（HGB）的体积分数、粒径、偶联剂改性等系列实验,总结分析了空心玻璃微珠对阻尼固体浮力材料力学性能的影响。结果表明,随着空心玻璃微珠体积分数的增加,浮力材料的吸水率逐渐增大,而密度、压缩强度和阻尼损耗因子逐渐降低;随着空心玻璃微珠粒径的增大,浮力材料的吸水率和阻尼损耗因子逐渐增加,而密度、压缩强度逐渐减小;添加偶联剂可有效改善空心玻璃微珠与环氧树脂的界面结合性,提高浮力材料的性能。      

空心微珠/环氧树脂高强浮力材料的性能及断裂分析

以环氧树脂为基体, 经硅烷活化处理的空心玻璃微珠(HGM)为填充剂, 制备了高强浮力材料。采用XRD、 FRIR分析了HGM的结构和硅烷处理效果, 通过密度测试和单轴静态压缩试验研究了HGM的类型和含量对浮力材料性能的影响, 利用SEM和吸水率试验研究了浮力材料的断裂特性和吸水性。结果表明: HGM为无定形结构; 硅烷分子接枝在HGM表面, 使得HGM与环氧树脂完好结合且两者界面没有间隙沟槽; HGM的较大比压缩强度有利于提高浮力材料的性能; 高强浮力材料密度为0.645~0.850 g/cm3, 抗压强度为60~93 MPa, 比压缩强度为92~112 MPa·cm3·g-1; HGM含量较少时, 浮力材料断裂表面HGM破裂处的基体环氧树脂有拖尾特征, HGM含量增多时, HGM的破坏程度不断增大直至完全破坏; 浮力材料具有较好的抗吸水性。      

环氧树脂基固体浮力材料的吸水性及压缩性

以不同固化剂固化的环氧树脂为基体,空心玻璃微珠(HGB)为分散相,加入硅烷偶联剂,制备得到固体浮力材料;研究了硅烷偶联剂添加量对固体浮力材料吸水性、45 MPa静水压力下吸水前后及干燥后压缩强度的影响;讨论了两种不同固化体系固体浮力材料性能的差异。结果表明:添加6%(质量分数)的偶联剂可以改善固体浮力材料的吸水性和压缩强度;酸酐固化剂甲基四氢苯酐(MeTHPA)固化的固体浮力材料的压缩强度高于胺类固化剂二氨基二苯基甲烷(DDM)固化的固体浮力材料的;固体浮力材料经过45 MPa静水压力吸水后及烘干后的压缩强度有不同程度的下降,添加偶联剂可以减小压缩强度下降的幅度。     

Hollow glass microsphere composites: preparation and properties

Composites consisting of bonded hollow glass microspheres are promising for constructions in which materials are needed that combine a high Young's modulus with a low density. The elastic properties of ideally bonded hollow glass microsphere composites are predicted theoretically. Heat-treated castings of quartz glass microspheres approach the theoretical Young's modulus from below. The best result achieved was a Young's modulus of about 1 GPa with a strength of about 0.8 MPa at a density of about 180 kg m^–3. This was obtained with a casting of quartz glass microspheres, bonded with mono-aluminium phosphate. Composites made by pressing of appropriate microsphere/ binder mixtures, followed by heating, had a density that was lower than for castings but had a Young's modulus far below the theoretical value.     

空心玻璃微珠/环氧树脂固体浮力材料模压成型工艺及性能

借鉴陶瓷材料模压成型工艺提出了适用于环氧树脂基固体浮力材料制备的真空辅助模压成型自由固化方法，实现了固体浮力材料制备过程中成型与固化环节的分离，为高性能固体浮力材料的制备提供了新方法。以环氧树脂(E-4221)为基体，空心玻璃微珠(Hollow glass microsphere, HGMS)做填充材料，采用模压成型自由固化方法制备高HGMS体积分数的HGMS/E-4221固体浮力材料，研究了HGMS体积分数、成型压力对HGMS/E-4221固体浮力材料密度、抗压强度、吸水率等性能的影响。结果表明，真空辅助模压成型自由固化方法适用于HGMS体积分数为65%~67%的HGMS/E-4221固体浮力材料制备，所获得的HGMS/E-4221固体浮力材料密度为0.621~0.655 g/cm3，适用深度可达到8 000~10 000 m。      

空心玻璃微珠/硅橡胶基柔性浮力材料的制备与性能研究

以牌号为HGS8000X的空心玻璃微珠(HGM)为填料,以液体硅橡胶(SR)为基体,采用真空辅助浇铸法和模压法制备柔性浮力材料,并研究空心玻璃微珠体积分数对柔性浮力材料的密度、拉伸性能、硬度和吸水率的影响。结果表明,所制备的柔性浮力材料的密度为0.6~0.8 g/cm3,在40 MPa水静压下2 h吸水率最大不超过0.25%,是良好的深海用柔性浮力材料;随着空心玻璃微珠添加量的增加,柔性浮力材料的密度降低,吸水率增加,弹性降低,硬度提高。     

Fatigue behaviour in hybrid hollow microspheres/fibre reinforced composites

This article presents the results of a current study concerning the influence of the addition of short fibres on the fatigue behaviour of syntactic foams. The material was obtained by vacuum-assisted resin transfer moulding adding hollow glass microspheres to an epoxy resin acting as binding matrix. Specimens with microsphere contents up to 50% and fibre reinforcement up to 1.2% in volume were tested at three-point bending at room temperature. Foams show significantly lower static and fatigue strength than an epoxy matrix. A significant decrease in the absolute strength with filler increase was observed, and even specific strength decreases for low filler contents and is nearly constant for the higher filler contents. Fatigue strength also decreases with the increase in filler content. The addition of glass fibre reinforcement produces only a slight improvement in flexure strength, while the addition of carbon fibres promotes an important improvement; a hybrid composite containing 0.9% carbon fibre is about 30% stronger than unreinforced foams. An improvement in fatigue strength more than 30% was obtained by the addition of small percentages of glass or carbon fibre.     

Dynamic Mechanical Analysis of Hybrid Fibre/Glass Microspheres Composites

Abstract: This article presents the results obtained in a current study of the viscous properties on hybrid short fibre/hollow glass microspheres composites fabricated with epoxy binder. The effect of the filler volume fraction and of the fibre reinforcement on the dynamic stiffness modulus, damping coefficient and glass transition temperature was studied. These properties were determined using dynamic mechanical analysis (DMA) in three points bending mode. The specimens were cut from plates produced by vacuum resin transfer moulding with microspheres weight contents up to 17%. Net resin exhibits storage modulus significantly higher than the 2% in weight of microspheres foam, while negligible effect was observed on the maximum loss modulus, maximum damping coefficient and glass transition temperature. The increase in filler volume fraction tends to decrease significantly storage and loss modulus at stable regions and the maximum damping coefficient, while glass transition temperature is only marginally affected. The addition of low contents of short fibre increases significantly storage modulus, particularly for carbon fibre, while maximum loss modulus does not exhibit a well‐defined tendency. Important reduction in the maximum damping coefficient was observed by the addition of both fibre reinforcements.