用回归分析法研究吸水膨胀橡胶的性能

用回归分析法对NBR制备吸水膨胀橡胶的吸水膨胀性和物理机械性能进行了研究.结果表明,吸水膨胀橡胶的吸水膨胀率随吸水树脂用量增加而增大,拉伸强度和拉断伸长率随吸水树脂用量增加而降低;随炭黑用量增加,物理机械性能提高,但体积膨胀率明显下降;建立的数学模型能较好地拟合炭黑和吸水树脂用量与胶料各项性能之间的关系.     

共混型吸水膨胀橡胶的研究

吸水膨胀橡胶(WSR)是一种具有优良吸水性和弹性的特种橡胶,在密封防水等方面有着广泛的应用前景。本文主要研究不同吸水树脂、增容剂与增容剂/吸水树脂比例对NR基共混型吸水膨胀橡胶性能的影响,并进一步考查吸水剂含量对WSR性能的影响。通过正交实验,得出了制备吸水膨胀橡胶的最佳组合;实验表明随吸水剂含量增加,WSR的吸水率增大,力学性能变差。     

共混型吸水膨胀橡胶的研究及应用

吸水膨胀橡胶是一种新型的功能性材料。本文介绍了共混型吸水膨胀橡胶在制备和应用方面的进展,并对今后的工作进行了展望。     

改性吸水树脂的合成及相应吸水膨胀橡胶的性能研究

以丙烯酸（AA）为主要单体、过氧化氢 抗坏血酸为引发体系、甲基丙烯酸缩水甘油酯（GMA）为改性单体合成改性吸水树脂,考察GMA/AA摩尔比对改性吸水树脂及相应吸水膨胀橡胶性能的影响。结果表明：GMA改性对吸水树脂及相应吸水膨胀橡胶的吸水性能有较大影响;当GMA/AA摩尔比为0.02时,吸水膨胀橡胶综合性能最佳,且吸水膨胀过程中吸水树脂析出情况得到明显改善。     

吸水膨胀橡胶

橡胶本身是疏水性材料，但配入亲水性大的物质可以增加它的吸水性，橡胶中添加超吸水性树脂，可以得到遇水后体积膨胀高达４－６倍吸水性橡胶制品，也可通过橡胶与聚环氧乙烯接枝制备吸水膨胀橡胶。吸水膨胀橡胶广泛用于建筑和地下管道的防水工程。     

吸水膨胀橡胶研究进展

介绍了吸水膨胀橡胶的特点、性能及分类,重点讨论了在制备工艺、各类吸水树脂、橡胶基质、增容剂及吸水膨胀橡胶中水状态等方面的研究进展及应用状况,展望了其未来发展方向。     

PAAS/SBR共混型吸水膨胀橡胶的制备及性能研究

以丁苯橡胶(SBR)为基体,交联聚丙烯酸钠(PAAS)为吸水组分,苯乙烯/马来酸酐共聚物(SMA)为反应型增容剂,聚乙二醇(PEG)为吸水促进剂,采用物理共混的方法制备了PAAS/SBR共混型吸水膨胀橡胶。通过正交试验法优化配方。当硫黄用量为2份、白炭黑/碳酸钙用量比为28/12、吸水组分PAAS用量为60份、增容剂SMA用量为5份时,制备的胶料具有较好的吸水膨胀性能和物理性能。     

改性吸水树脂合成及其吸水膨胀橡胶的性能

本文以聚丙烯酸钠为主要原料,用抗坏血酸/过氧化氢为引发体系合成了聚丙烯酸钠系吸水树脂,并将所制备的吸水树脂与天然橡胶制备成吸水膨胀橡胶,考察了甲基丙烯酸缩水甘油酯（GMA）与丙烯酸钠的比例对吸水树脂性能及其吸水膨胀橡胶性能的影响。实验结果表明, GMA改性吸水树脂对吸水树脂及其吸水膨胀橡胶性能的吸水性能有较大的影响,同时GMA改性吸水树脂可与橡胶共硫化。当GMA的物质量比为2%时,制备的吸水橡胶各项性能最佳,力学性能较佳,橡胶吸水膨胀过程中,吸水树脂析出现象显著降低。     

共混增容型吸水膨胀橡胶的性能研究

以天然橡胶和聚丙烯酸纳(PAANa)为主要原料,采用物理共混方式制备吸水膨胀橡胶,研究了增容剂及辅助吸水剂PEG对吸水膨胀橡胶吸水性能和力学性能的影响.实验表明,环氧化天然橡胶作增容剂效果较好;PEG有利于提高材料的吸水性能.     

共混型吸水膨胀橡胶增容剂的研究进展

在共混型吸水膨胀橡胶（WSR）中添加适当的增容剂,可以提高WSR中弹性体与亲水性组分的微观相容性,进而提高WSR吸水膨胀性能、力学性能及耐用性等应用性能。本文介绍了共混型吸水膨胀橡胶增容剂的国内外研究现状。     

硅橡胶/有机橡胶共混改性的研究与应用

硅橡胶是一种综合性能优异的橡胶，目前已在许多共混物中应用。本文综述了近几年来硅橡胶／有机橡胶（三元乙丙橡胶、氟橡胶、橡胶型乙烯-乙酸乙烯酯、丙烯酸酯、聚氨酯橡胶）共混改性的最新研究状况与应用。最后介绍了硅橡胶／有机橡胶共混改性材料的发展方向。     

导电硅橡胶配方的优化设计

主要通过正交设计法对硅橡胶的导电性进行研究，通过改变白炭黑、乙炔炭黑、羟基硅油和过氧化二异丙苯的用量对硅橡胶的导电性以及综合性能加以研究。     

大型硅橡胶密封圈的优化设计

对应用于负能炼钢转炉煤气回收系统的大型硅橡胶密封圈进行优化设计.结果表明,在模具非工作面开2~4个直径为2 mm的溢胶孔可以防止产品产生缩裂;选用中低温硫化剂可以缓解和消除产品缩裂现象;采用不同的硫化体系、适宜的硫化温度和工艺可以解决成品的尺寸偏差问题.     

EPDM基吸水膨胀橡胶的力学性能

研究了三元乙丙橡胶与聚丙烯酰胺共混制得的吸水膨胀橡胶的力学性能,发现聚丙烯酰胺用量对干态吸水膨胀橡胶的强伸性能有明显影响;而当聚丙烯酰胺含量一定时,随吸水膨胀橡胶率的提高 ,强伸性能出现一个最佳值后下降,压缩永久变形则随吸水膨胀率的提高而减小,这现现象可能与聚丙烷酰胺吸水后物理性质变化有关。     

全钢载重子午线轮胎胎肩垫胶配方的优化设计

对全钢载重子午线轮胎胎肩垫胶配方进行优化设计.结果表明,通过减少炭黑用量,加入白炭黑和硅烷偶联剂,不使用增粘树脂,试验胶料的定伸应力提高,对降低胶料的动态和压缩生热有良好作用;配方中使用抗硫化返原剂Perkalink 900,可明显提高胶料抗热降解性能;采用试验胶料试制的成品轮胎耐久性能较好.     

Anisotropic swelling of thin EPDM rubber discs by absorption of toluene

Anisotropic swelling of thin EPDM discs is observed when they are in contact with toluene resulting from the liquid absorption. The process is controlled by transient diffusion, with a concentration-dependent diffusivity and a finite coefficient of convective transfer at the liquid-rubber interface. Moreover a rather high swelling takes place during the stage of absorption, leading to an increase in dimensions of the flat discs. The increase in the thickness of the discs is around 1.17-1.18 times larger than that in the radius, exhibiting an anisotropic behaviour. The flat discs have been cured by pressing them in the heated slabs of a press, leading to a kind of orientation of the molecules. The state of cure of around 96% has been determined either by calorimetry in scanning mode or by a moving die rheometer under isothermal conditions at three temperatures within the 170-190 °C range. Various percent peroxide as a vulcanising agent have been used, e.g. 2, 10, and 20%. While the diffusivity is about similar for the three samples, the extent of liquid absorbed decreases with the percent peroxide. A numerical model based on finite differences taking into account all these facts has been built in order to describe the process.     

高吸水膨胀橡胶的研制

通过初步选择基本配方,再用正交设计的实验方法对影响因素硫黄、吸水组分、相容剂、填料进行了优化实验,制得了物理机械性能较好的高吸水膨胀橡胶,即吸水倍率500％以上、邵尔A硬度75、拉伸强度大于6MPa、拉断伸长率大于300％、吸水速率小于6h、吸水后质量损失率小于13％的吸水膨胀橡胶。     

Long-term water absorption and swelling of glass-bead filled plastics

The results of experimental and theoretical investigation of epoxy EDT- 10/glass-bead plastics at long-term (10 years) exposure in water are presented. The curves of water absorption and swelling are determined. It was expected that the addition of hollow glass spheres (beads) must substantially reduce the sorptional capacity of a material, because of reduction of the volume content of the matrix, and therefore, because of reduction of the volume where the molecules of water can diffuse. However, the water absorption process in glass-bead filled plastics was found to continue during the total term of the experiments without a tendency to stop. After ten years the equilibrium state was not achieved and the concentration of water in the composite specimens became more than the equilibrium concentration of water in unfilled EDT-10 epoxy. The swelling coefficient was found to be a non-linear function of water content. It was found that the initial parts of experimental curves of water absorption and swelling (during the first year of exposure) show an agreement with calculated data, good enough for engineering applications. Subsequently the discrepancy between the experimental results and calculated data increased. The possible reasons for such a discrepancy are discussed.     

有机介质中聚丙烯酸钠/SBR共混型WSR的溶胀性能

研究了兼具双亲性和膨胀性吸水膨胀橡胶对有机溶剂的吸收性能，测定了该吸水膨胀橡胶中有机相的溶解度参数，研究了吸水树脂等无机相对吸水膨胀橡胶在有机溶剂中最大溶胀度的影响。