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1.
阐述了蛋白质等杂质对肌醇质量,得率以及原辅助材料消耗造成的影响,针对肌醇中蛋白质等杂质的特点,在不改变原生产流程,不增添设备前提下,采用净化剂FNO-10,在去除蛋白质方面取得了明显的效果,不但提高了肌醇的质量,而且提高了肌醇得率,减少了辅助材料的消耗,降低了生产成本。  相似文献   

2.
鉴于新型锌合金的硅含量,可高于常见锌合金的10倍,在用光度法测硅前,对单硅酸的聚合性问题,进行了理论分析,并作了试验验证。结果表明,新型锌合金在测定条件下,单硅酸不聚合,所配制的一系列测硅检量液可隔夜使用,这既保证了测硅的准确度,又简化了操作,提高了分析速度,节约了药品。  相似文献   

3.
氢化丁腈橡胶性能研究   总被引:8,自引:0,他引:8  
本文对氢化丁腈橡胶的基本特性进行了介绍,分别进行了补强剂,硫化剂,助交联剂的变量试验,讨论了补强剂,硫化剂,助交联剂对氢化丁腈橡胶性能的影响,同时还测试了常温条件下,热空气老化及浸油后的各项性能,还比较了不同温度条件下的压缩永久变形值,通过计算机将所测得的性能参数进行回归分析,从而进一步评价了氢化丁腈 橡胶的物理机械性能。  相似文献   

4.
复合稳定剂稳定过碳酸钠的研究   总被引:6,自引:0,他引:6  
研究了过碳酸钠的制备方法,筛选了合成的最佳工艺条件,对硅酸钠,三乙醇胺,乙二胺四乙酸钠等内稳定剂分别作了研究,选择了最佳内稳定配比,再结合外稳定剂复合稳定,产品稳定性好,有效氧含量高,工艺简单,具有较高的工业生产价值。  相似文献   

5.
汪凌云 《中国橡胶》1993,(20):11-12
1987年以来,跃进橡胶厂进行了卓有成效的技术改造,兴建了8000多m^2的成型大楼,淘汰了一些老设备,改建了2000m^2的制帮车间,新装了五条生产线,并对公用工程进行了填平补齐,从而为九十年代的经济发展奠定了物质基础,使企业长期保持兴旺发达。该厂的经验归纳起来有如下几点:  相似文献   

6.
符兴国 《广东化工》2003,30(1):40-43
本文分析了大储罐的结构,制造及设计,讨论了加工设计中面临的几个问题,介绍了实际的解决方法,详述了怎样解决尺寸确定,机构设计,加工制造,焊接的问题。  相似文献   

7.
马维山  赵鹏  何铁钢  于明哲  王金成 《辽宁化工》2007,36(6):407-408,411
通过对聚酯厂涤纶循环水系统的考察,在保证设备平稳运行的前提下,优化操作,确定了最佳水处理方案,解决了进一步提高循环水浓缩倍数的难题,进而大大减少了新鲜水的用量和污水的排放量,节约水资源,保护环境,提高经济效益,获得了良好的社会效益。  相似文献   

8.
氨液浸出催化氧化制备硫酸铜晶体的方法探讨   总被引:1,自引:1,他引:1  
探讨了氨液浸出催化氧化制备硫酸铜的方法,并从热力学,动力学等角度进行了分析,对其反应可能性进行了论证,从多方面对反应机理进行了探讨。同时,将氨液浸出法与高温焙烧法作了对比,对其工业生产可能性作了分析,在多次实验的基础上,得出了较为合理的工艺条件。  相似文献   

9.
魏刚  陈建寿 《中国氯碱》2003,(10):16-18,24
通过改进工艺流程,科学确定加热面积的配比,合理选择采盐泵等技术改进措施,提高了生产强度,满足了高气压的生产条件,延长了洗效周期,减少了设备的腐蚀,提高了成品碱的质量,满足了生产联二脲的要求并降低了汽耗和电耗,年可节约ll0万元。  相似文献   

10.
左小青 《塑料技术》1995,15(2):29-32
综述了无机填料的表面处理,提出了固体表面设计理论,一是催化活动比固体表面,提高分子定向反应的选择性;二是改性填料表面,提高补强作用,从此理论出发,研究了液体羟基丁二烯,磷酸酯偶联剂等在一定的催化剂存在下,在填料的粒子表面产生了化学反应,提高了与橡胶,塑料的亲合性。  相似文献   

11.
树脂基复合材料成型工艺研究进展   总被引:3,自引:0,他引:3  
主要综述了树脂基复合材料的几种成型工艺,包括RTM、VARTM、CRTM、LRTM、RFI、VARI、SCRIMP、SRIM、TERM,各自的发展现状、成型原理、特点等.  相似文献   

12.
收集了2010年7月~2011年6月世界塑料工业的相关资料,介绍了2010~2011年世界塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚氯乙烯、聚苯乙烯、ABS树脂),工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚),特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮),通用热固性树脂(酚醛、不饱和聚酯树脂、环氧树脂、聚氨酯)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。  相似文献   

13.
Polyvinylidene fluoride (PVDF) is a semicrystalline thermoplastic and electroactive polymer with piezoelectric and pyroelectric properties, thermal stability, elasticity, and chemical resistance. PVDF exits in five different phases (α, β, δ, γ, and ε-phase). Unique properties of this polymer enhances its use in chemical, biomedical, and electronic industries such as supercapacitors, transducers, actuators, and batteries. Carbon nanotube (CNT) is used as reinforcement to exploit full potential of PVDF in energy, electronics, and membrane technology. The nanofiller affects morphology, piezoelectric, pyroelectric, electrical, dielectric, thermal, and mechanical properties of PVDF-based nanocomposite. CNT content and chemical modification influence properties as well as application of PVDF.  相似文献   

14.
2004~2005年国外塑料工业进展   总被引:1,自引:0,他引:1  
收集了2004年7月-2005年6月国外塑料工业的相关资料,介绍了2004年~2005年国外塑料工业的发展情况。提供了世界几大区域塑料的产量、增长率及所占份额;美国、德国、日本、韩国、法国、比利时、印度、西班牙、中国台湾、加拿大、巴西、英国等国家和地区的不同树脂的产量及消费量;各国、各地区塑料原料的产量、进出口量、国内消费量和人均消费量;日本塑料原料的生产情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、通用热固性树脂(酚醛、聚氨酯、不饱和树脂、环氧树脂)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮、聚砜)的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。  相似文献   

15.
《Ceramics International》2023,49(20):32343-32358
The many branches of nanoscience have made significant strides and advancements during the past ten years, as has the entire scientific community. Zirconia nanoparticles have several uses as adsorbents, nanosensors, nanocatalysts, and other types of nanomaterials. Their outstanding biomedical uses in dental care and drug delivery, as well as their intriguing biological characteristics, such as their anti-cancer, anti-microbial, and antioxidant activity, have further encouraged researchers to investigate their physicochemical properties using various synthetic pathways. Due to the popularity of zirconia-based nanomaterials, the current research comprehensively examines several synthesis techniques and their effects on the composition, dimensions, forms, and morphologies of these nanomaterials. In general, there are two methods for creating zirconia nanoparticles: chemical synthesis, which uses hydrothermal, solvothermal, sol-gel, microwave, solution combustion, and co-precipitation processes; and a greener method, which uses bacteria, fungi, and plant components. The aforementioned techniques have been evaluated in the present review for achieving particular phases and shapes. A thorough analysis of zirconia-based nanomaterial's uses is also included in the review. Furthermore, comparisons with their equivalent composites for various applications as well as the influence of particular phases and morphologies have been added. The final portion includes the summary, future outlook, and potential application.  相似文献   

16.
Over the last years, different nanomaterials have been investigated to design highly selective and sensitive sensors, reaching nano/picomolar concentrations of biomolecules, which is crucial for medical sciences and the healthcare industry in order to assess physiological and metabolic parameters. The discovery of graphene (G) has unexpectedly impulsed research on developing cost-effective electrode materials owed to its unique physical and chemical properties, including high specific surface area, elevated carrier mobility, exceptional electrical and thermal conductivity, strong stiffness and strength combined with flexibility and optical transparency. G and its derivatives, including graphene oxide (GO) and reduced graphene oxide (rGO), are becoming an important class of nanomaterials in the area of optical and electrochemical sensors. The presence of oxygenated functional groups makes GO nanosheets amphiphilic, facilitating chemical functionalization. G-based nanomaterials can be easily combined with different types of inorganic nanoparticles, including metals and metal oxides, quantum dots, organic polymers, and biomolecules, to yield a wide range of nanocomposites with enhanced sensitivity for sensor applications. This review provides an overview of recent research on G-based nanocomposites for the detection of bioactive compounds, providing insights on the unique advantages offered by G and its derivatives. Their synthesis process, functionalization routes, and main properties are summarized, and the main challenges are also discussed. The antioxidants selected for this review are melatonin, gallic acid, tannic acid, resveratrol, oleuropein, hydroxytyrosol, tocopherol, ascorbic acid, and curcumin. They were chosen owed to their beneficial properties for human health, including antibiotic, antiviral, cardiovascular protector, anticancer, anti-inflammatory, cytoprotective, neuroprotective, antiageing, antidegenerative, and antiallergic capacity. The sensitivity and selectivity of G-based electrochemical and fluorescent sensors are also examined. Finally, the future outlook for the development of G-based sensors for this type of biocompounds is outlined.  相似文献   

17.
Electrospinning jets and polymer nanofibers   总被引:4,自引:0,他引:4  
In electrospinning, polymer nanofibers are formed by the creation and elongation of an electrified fluid jet. The path of the jet is from a fluid surface that is often, but not necessarily constrained by an orifice, through a straight segment of a tapering cone, then through a series of successively smaller electrically driven bending coils, with each bending coil having turns of increasing radius, and finally solidifying into a continuous thin fiber. Control of the process produces fibers with nanometer scale diameters, along with various cross-sectional shapes, beads, branches and buckling coils or zigzags. Additions to the fluid being spun, such as chemical reagents, other polymers, dispersed particles, proteins, and viable cells, resulted in the inclusion of the added material along the nanofibers. Post-treatments of nanofibers, by conglutination, by vapor coating, by chemical treatment of the surfaces, and by thermal processing, broaden the usefulness of nanofibers.  相似文献   

18.
Even though several plants can improve the female reproductive function, the use of herbs, herbal preparations, or essential oils during pregnancy is questionable. This review is focused on the effects of some essential oils and their constituents on the female reproductive system during pregnancy and on the development of the fetus. The major concerns include causing abortion, reproductive hormone modulation, maternal toxicity, teratogenicity, and embryo-fetotoxicity. This work summarizes the important studies on the reproductive effects of essential oil constituents anethole, apiole, citral, camphor, thymoquinone, trans-sabinyl acetate, methyl salicylate, thujone, pulegone, β-elemene, β-eudesmol, and costus lactone, among others.  相似文献   

19.
Liquid silicone rubber (LSR) is an elastomer molded into critical performance components for applications in medical, power, consumer, automotive, and aerospace applications. This article reviews process behavior, material modeling, and simulation of the (LSR) injection molding process. Each phase of the LSR injection molding process is discussed, including resin handling, plastication, injection, pack and hold, and curing; and factors affecting the molding process are reviewed. Processing behavior of LSR is marked by transient interactions between curing, shear rate, temperature, pressure, and tooling. Therefore, current LSR models for curing, viscosity, pressure, and temperature are discussed. Process dynamics and material modeling are combined in LSR injection molding simulations with applications in mold design, troubleshooting process-induced defects, and management of shear stress and non-uniform temperatures between LSR and substrates during overmolding. Finally, case studies using commercial simulation software are presented, which have shown cavity pressure and flow front advancement within 3% of experimental values. Optimization of LSR materials, data collection, model fitting, venting, and bonding remain areas of continued interest.  相似文献   

20.
This standard specifies the classification, shape, dimension, technical requirements, test method, inspection rules, packing, marking, transportation, storage and quality certification of fireclay refractory bricks for hot blast stove.  相似文献   

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