DSC分析在聚酯生产中的应用

通过聚酯产品的DSC测试谱图信息,剖析不同情况下聚酯切片及瓶胚的特性,提出了利用DSC测试进行聚酯切片的异物分析、切片来源判断、结晶性能评价、用户投诉样品剖析以及新产品开发时工艺调整的建议,进一步说明DSC测试在聚酯生产、品质控制工作中的重要作用。     

氢氧化钠法提取镁元素的资源化利用研究

基于海水提镁的原理,以反渗透海水淡化后的浓水为原料,采用Na_2CO_3做脱钙剂,改变Na_2CO_3的量,反应时间,反应温度,确定出了最佳脱钙条件并向脱钙母液中滴加NaOH,改变其物质的量、反应温度、反应时间及静置时间,考察其对Mg(OH)_2产率及纯度的影响。     

原位生成SiO_2改性硼硅酚醛树脂的合成与性能研究

在合成酚醛树脂的过程中引入有机硅预聚物和硼酸,制得硼硅酚醛树脂,并在此基础上加入正硅酸乙酯,原位水解生成SiO 2,进一步改性了硼硅酚醛树脂。分别考查了有机硅预聚物、硼酸和正硅酸乙酯加入量对改性酚醛树脂粘接强度的影响。通过IR考查了改性树脂的结构,硼氧键和硅氧键成功地引入到酚醛树脂中。还通过DSC和不同条件下粘接强度的测试考查了改性树脂的固化性能,确定了其固化工艺。空气气氛中的热重分析则表明改性酚醛树脂初始分解温度为475℃,1 000℃残炭率为21%,耐热性明显优于普通酚醛树脂。     

扇三角洲前缘储层构型及对剩余油分布的影响研究

随着不断的深入开发,国内大部分油田已进入特高含水后期开发阶段,剩余油分布零散复杂,储层构型已经成为控制剩余油分布的主要地质因素。为了进一步提高开发效率,掌控剩余油分布规律,对储层构型进行精细解剖,明确储层构型对剩余油分布的影响关系尤为重要。本文以储层地质学、沉积学及储层层次分析理论为指导,综合利用钻井岩芯、测井及开发动态资料,以河南双河油田437区块核三段Ⅱ油组1、2层为例,对扇三角洲前缘储层内部构型及对剩余油分布的影响进行了精细研究。结果表明:目的层段扇三角洲前缘构型可划分为7级,并且复合砂体存在4种平面组合方式;基于3种砂体边界识别方法,得出单一辫状河道砂体在垂向上的3种叠置方式,即叠加式、切叠式和独立式。在此基础上,本文探讨了储层构型对剩余油分布规律的影响,分析可知复合砂体平面组合样式和单一砂体内部韵律性以及单一砂体之间垂向叠置样式是造成剩余油富集的主要因素,为指导研究区部署剩余油挖潜方案,以及类似沉积环境下构型解剖提供参考。     

Study on the influence of three-grid assembly thermal deformation on breakdown times and an ion extraction process

In order to study the influence of three-grid assembly thermal deformation caused by heat accumulation on breakdown times and an ion extraction process,a hot gap test and a breakdown time test are carried out to obtain thermal deformation of the grids when the thruster is in 5 k W operation mode.Meanwhile,the fluid simulation method and particle-in-cell-Monte Carlo collision(PICMCC) method are adopted to simulate the ion extraction process according to the previous test results.The numerical calculation results are verified by the ion thruster performance test.The results show that after about 1.2 h operation,the hot gap between the screen grid and the accelerator grid reduce to 0.25–0.3 mm,while the hot gap between the accelerator grid and the decelerator grid increase from 1 mm to about 1.4 mm when the grids reach thermal equilibrium,and the hot gap is almost unchanged.In addition,the breakdown times experiment shows that 0.26 mm is the minimal safe hot gap for the grid assembly as the breakdown times improves significantly when the gap is smaller than this value.Fluid simulation results show that the plasma density of the screen grid is in the range 6?×10~(17)–6?×?10~(18) m~(13) and displays a parabolic characteristic,while the electron temperature gradually increases along the axial direction.The PIC-MCC results show that the current falling of an ion beam through a single aperture is significant.Meanwhile,the intercepted current of the accelerator grid and the decelerator grid both increase with the change in the hot gap.The ion beam current has optimal perveance status without thermal deformation,and the intercepted current of the accelerator grid and the decelerator grid are 3.65 m A and 6.26 m A,respectively.Furthermore,under the effect of thermal deformation,the ion beam current has over-perveance status,and the intercepted current of the accelerator grid and the decelerator grid are 10.46 m A and 18.24 m A,respectively.Performance test results indicate that the breakdown times increase obviously.The intercepted current of the accelerator grid and the decelerator grid increases to 13 m A and 16.5 m A,respectively,due to the change in the hot gap after 1.5 h operation.The numerical calculation results are well consistent with performance test results,and the error comes mainly from the test uncertainty of the hot gap.     

Study of the key factors affecting the triple grid lifetime of the LIPS-300 ion thruster

In order to ascertain the key factors affecting the lifetime of the triple grids in the LIPS-300 ion thruster,the thermal deformation,upstream ion density and component lifetime of the grids are simulated with finite element analysis,fluid simulation and charged-particle tracing simulation methods on the basis of a 1500 h short lifetime test.The key factor affecting the lifetime of the triple grids in the LIPS-300 ion thruster is obtained and analyzed through the test results.The results show that ion sputtering erosion of the grids in 5 kW operation mode is greater than in the case of 3 kW.In 5 kW mode,the decelerator grid shows the most serious corrosion,the accelerator grid shows moderate corrosion,and the screen grid shows the least amount of corrosion.With the serious corrosion of the grids in 5 kW operation mode,the intercept current of the acceleration and deceleration grids increases substantially.Meanwhile,the cold gap between the accelerator grid and the screen grid decreases from 1 mm to 0.7 mm,while the cold gap between the accelerator grid and the decelerator grid increases from 1 mm to 1.25 mm after 1500 h of thruster operation.At equilibrium temperature with 5 k W power,the finite element method(FEM)simulation results show that the hot gap between the screen grid and the accelerator grid reduces to 0.2 mm.Accordingly,the hot gap between the accelerator grid and the decelerator grid increases to 1.5 mm.According to the fluid method,the plasma density simulated in most regions of the discharge chamber is 1?×?10~(18)-8?×?10~(18)m~(-3).The upstream plasma density of the screen grid is in the range 6?×?10~(17)-6?×?10~(18)m~(-3)and displays a parabolic characteristic.The charged particle tracing simulation method results show that the ion beam current without the thermal deformation of triple grids has optimal perveance status.The ion sputtering rates of the accelerator grid hole and the decelerator hole are 5.5?×?10~(-14)kg s~(-1)and 4.28?×?10~(-14)kg s~(-1),respectively,while after the thermal deformation of the triple grids,the ion beam current has over-perveance status.The ion sputtering rates of the accelerator grid hole and the decelerator hole are 1.41?×?10~(-13)kg s~(-1)and 4.1?×?10~(-13)kg s~(-1),respectively.The anode current is a key factor for the triple grid lifetime in situations where the structural strength of the grids does not change with temperature variation.The average sputtering rates of the accelerator grid and the decelerator grid,which were measured during the 1500 h lifetime test in5 k W operating conditions,are 2.2?×?10~(-13)kg s~(-1)and 7.3?×?10~(-13)kg s~(-1),respectively.These results are in accordance with the simulation,and the error comes mainly from the calculation distribution of the upstream plasma density of the grids.     

聚硫密封胶耐老化性能研究

以环氧改性液体聚硫密封胶为基胶,研究了环氧树脂、液体聚硫橡胶、填料、防老剂种类及用量对聚硫密封胶常温拉伸性能及老化后拉伸性能的影响.结果表明,通过环氧改性聚硫橡胶,可有效提高聚硫密封胶的扯断伸长率及耐热老化性能.填料对聚硫密封胶均有一定的补强效果,炭黑的补强效果最好,A-380的耐热老化性能最好.防老剂D可有效提高聚硫...     

二胺结构对线形缩聚型聚酰亚胺性能的影响

以3,3',4,4'-二苯醚二酐(OPDA)与六种不同结构的二胺在N,N-二甲基乙酰胺中通过逐步聚合,合成了线性缩聚型聚酰胺酸,并通过热关环制备了聚酰亚胺,探讨了二胺结构对其热性能及粘接性能的影响.红外分析表明,固化后的聚酰亚胺已经完全酰亚胺化.差示扫描量热(DSC)结果表明,聚酰亚胺具有较高的玻璃化转变温度,并随着结...     

上海莘庄工业区西区绿色低碳建设实践

莘庄工业区西区秉持"绿色低碳示范"发展战略,通过制定绿色生态专项规划,明确全生命周期低碳建设目标,创新性引入第三方监管机构参与建设管理、建造冷热电三联供能源中心实现能源梯级利用、构建能源管理系统和客户端能源管理系统实现运行节能,确保园区按照绿色低碳的路径进行建设和落实。