Adsorption/desorption of toluene on a hypercrosslinked polymeric resin in a highly humid gas stream

In many sources of volatile organic compounds (VOCs), large amounts of water vapor come from the air and the reactors. The relative humidity (RH) of exhaust gas is normally >60% and is supersaturated. Maintaining the property of adsorbent on VOCs in a highly humid gas stream is a serious industrial problem. In this study, the adsorption/desorption behavior of toluene in a micro-mesoporous polymeric resin was investigated in a highly humid environment to explore the influence of abound water vapor on resin adsorption and regeneration. This resin could selectively adsorb toluene at an RH of 80%, and its adsorption property was unaffected by the presence of water vapor. In the case of humidity saturation, the resin displayed a high adsorption capacity at a moisture content of <30%. Therefore, the polymer resin is an excellent water-resistant adsorbent of VOCs. In the regenerative experiment, the resin maintained its original adsorption capability after four adsorption/ desorption cycles of toluene purging with nitrogen gas at 120℃. The resin exhibited excellent regeneration performance at high humidity.

Research on testing method of resin sand high temperature compressive strength

High temperature compressive strength is one of the most important performances of resin sand; its value directly concerns the quality of castings. In order to seek the best testing method of resin sand high temperature compressive strength, a self-developed instrument was used to carry out experiments, and the sample shape and size were designed and studied. The results show that a hollow cylinder sample can reflect the strength difference of different resin sands better than a solid cylinder sample, and its data is stable. The experiments selected φ20/5×30 mm as the size of the hollow cylinder samples. The high temperature compressive strengths of phenol-formaldehyde resin coated sand, furan resin self-setting sand, and TEA resin sand were each tested. For the resin sand used for cast steel and cast iron, 1,000 ℃ was selected as the test temperature; for the resin sand used for cast non-ferrous alloy, 800 ℃ was selected as the test temperature; and for all the resin sand samples, 1 min was selected as the holding time. This testing method can truthfully reflect the high temperature performance of three kinds of resin sand; it is reproducible, and the variation coefficients of test values are under 10%.

Simultaneous Determination of Trace Rare Earth Elements and Other Elements in High Purity Terbium Oxide (Tb_4O_7) by ICP-AES After HPLC Separation Using P507 Resin

This article describes a new method for the simultaneous determination of trace rare earth elements (REEs) and non rare earth elements (NREEs) in high purity terbium oxide by ICP-AES after HPLC separation using P507 resin. The chromatographic separation of the analytes from the matrix using dilute nitric acid as mobile phase was studied. The experimental results showed that a favorable separation of trace metals (Cu and Gd) from the matrix (Tb) can easily be achieved by elution with dilute nitric acid within 25 min. The proposed method was applied to the determination of trace metals (Ca, Cu, Mg, Mn, Ni, Si, La, Ce, Pr, Nd, Sm, Eu and Gd) in high purity terbium oxide. The detection limits (DLs) for the analytes ranged from 0.4-4.0 μg\5g -1, and the recoveries are from 78%-105%.

Highly Active and Stable Ni_2P/SiO_2 Catalyst for Hydrogenation of C_9 Petroleum Resin

Catalytic hydrogenation is an appropriate method for the improvement of C9 petroleum resin（C9PR） quality. In this study, the Ni2P/SiO2（containing 10% of Ni） catalyst prepared by the temperature-programmed reduction（TPR） method was used for hydrogenation of C9 petroleum resins. The effect of reaction conditions on catalytic performance was studied, and the results showed that the optimum reaction temperature, pressure and liquid hourly space velocity（LHSV） was 250 ℃, 6.0 MPa, and 1.0 h-1, respectively. The bromine numbers of hydrogenated products were maintained at low values（250 mg Br/100g） within 300h, showing the high activity and stability of Ni2P/SiO2 catalyst. The fresh and spent catalysts were characterized by X-ray diffraction（XRD）, BET surface area（BET） analysis, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, Fourier transform infrared（FTIR） pyridine adsorption, and X-ray photoelectron spectroscopy（XPS）. Compared with the traditional sulfurated-Ni W catalysts, Ni2P possessed globe-like structure instead of layered structure like the active phase of Ni WS, thereof exposing more active sites, which were responsible for the high activity of Ni2P/SiO2 catalyst. The stability of Ni2P/SiO2 catalyst was probably attributed to its high sulfur tolerance, antisintering, anti-coking and carbon-resistance ability. These properties might be further ascribed to the special Ni-P-S surface phase, high thermal stability of Ni2P nanoparticles and weak surface acidity for the Ni2P/SiO2 catalyst.

Self-encoding Functional Resin Applying for Combinatorial Chemistry and High Throughput Screening

A novel solid phase organic synthesis resin was synthesized for combinatorial high-throughput screening,which based on FTIR spectra self-encoding functional resin technology. A new deconvolution strategy termed position encoding deconvolution had illustrated and was compared with some popular combinatorial deconvolution strategies in efficiency and information content. The mimic high throughput screening of hexapeptide library successfully proved the applying of the self-encoding functional resin technology and the position encoding deconvolution strategy.

Preparation of Intercalated Clay/Phenolic Resin Nanocomposites under High Pressure

High pressure method was ased for the first time to produce rectorite clay （REC）/phenolic resin （PF） and organic rectorite clay （OREC） /phenolic resin and montmorillonite（ MMT）lphenolic resin （PF） nanocomposites. The structure of the material phase was studied by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, Fourier transform infrared （ FT- IR ） spectroscopy, thermogravimetric analysis （ TGA ）, and atomic force microscopg＂ （AFM）. The experimental results show that intercalated clay/resin nanocomposites could form under normal temperature and high pressure conditions by the intercalation of polymeric molecules rather than interlayer polymerization.

SYNTHESIS AND PROPERTIES OF HIGHLY OIL-ABSORPTIVE RESIN WITH HYDROXY ETHYLACRYLATE AS POTENTIAL CROSSLINKING AGENT

A concept of potential crosslinking agent was introduced into the synthesizing process of highly oil-absorptive resin that is traditionally prepared by single chemical crosslinking.The resin was heated after manufactured to obtain three-dimension network structure.The effects of potential crosslinking agent and the crosslinking conditions on the absorptive properties of resin were studied.The results showed that hydroxyl ethylacrylate got satisfied results,and the resin with it had good oil absorbency and oil retention.

Development of a new instrument for measurement of high temperature mechanical properties of resin-bonded sand

The mechanical properties of resin-bonded sand mixtures at high temperatures significantly affect the quality of casting. However, the existing instruments for high-temperature performances testing mainly focus on inorganic binder-bonded sands no matter the test items or the atmospheric protection, while the instrumentss specially designed for resin-bonded sand are not yet available. A new instrument for testing the hightemperature performance of resin sand was designed including the confirmation of the testing parameters, loading, measurement and control systems, and the design of the frame shape and heating furnace. This instrument can test the compressive strength, heat tolerance time and restraining load of phenol-formaldehyde resin coated sand, self-hardened furan resin sand, and trimethylamine(TEA)-based resin bonded sand at high temperatures. The developed instrument has a high accuracy offering smaller than 0.3% deviation at a full scale in the measurement of the high temperature compressive strength and the restraining load over the range of 0-6.8 MPa and 0-2,000 N, respectively. The high temperature heat tolerance time range is 0-300 s and its measurement accuracy is ±1 s.

Evaluation study on properties of a macroporous silica-based CMPO extraction resin to be used forminor actinides separation from high level liquid waste

Basic properties of a silica-based octyl(phenyl)-N,N-diisobutylcarbamoyl-methylphosphine oxide (CMPO) extraction resin (CMPO/SiO2-P) was investigated.Adsorption behavior for some rare earth elements (RE) which are constituents of high level liquid waste (HLLW) and the long-term stability of the extraction resin in nitric acid solution were examined.The CMPO extraction resin was significantly stable in 3 mol·L?1 HNO3 solution at 50oC.Furthermore,the RE(III) were efficiently separated from non-adsorptive fission product (FP) elements such as Sr(II) in a column experiment using a highly nitric acid solution.The separation behaviors of the elements are considered to result from the difference in their adsorption and elution selectivity based on the complex formation with CMPO.There was no strong dependency of RE(III) separation efficiency on feed solution flow rate.Only from the perspectives of the acid-resistant behavior of CMPO extraction resin and the elution kinetics for the metal ions with the extraction resin,the CMPO extraction resin can be used in the modified MAREC process for HLLW partitioning.

碳氢树脂高频覆铜板的研究进展

本文综述了高频覆铜板的特点,并对其基体树脂的介电性能进行对比,重点介绍了碳氢树脂(PCH)高频覆铜板的研究进展。通过对目前碳氢树脂高频覆铜板研究的总结,找出现存的问题并对其未来发展趋势进行展望。

耐高温泡沫树脂低伤害均匀固砂技术

针对常规泡沫树脂体系耐温性较差和辽河油田疏松砂岩稠油油藏化学固砂储层伤害大与有效期短的问题,以环氧树脂、酚醛树脂、疏水纳米SiO_(2)、硅烷偶联剂等为原料制得纳米改性树脂基液,然后加入固化剂、乳化剂、起泡剂、稳泡剂等添加剂制得泡沫树脂固砂体系。评价了该体系的固化温度、固砂强度、渗透性能、耐温性能和非均质多层注入性能;研发了配套的泡沫发生器,形成了耐高温泡沫树脂低伤害均匀固砂技术,并在辽河油田进行了现场应用。结果表明,泡沫树脂固砂体系的最优配方为:20%~30%树脂基液+8%~12%酚醛胺类固化剂+0.3%乳化剂OP-10+0.5%起泡剂有机硅表面活性剂+0.1%固体稳泡剂纳米SiO_(2)+0.1%聚合物稳泡剂聚乙二醇+57%~71%清水。该体系的起泡体积约为发泡前的7倍、半衰期大于20 min,可在35℃以上固化,固化后耐温可达280℃,既具有低温固化的特点,又具有耐高温的特点。在不同温度下固化的泡沫树脂固结岩心的抗压强度达到5 MPa以上,固砂强度高,满足疏松砂岩固砂强度的要求。对用0.25~0.42 mm石英砂制得的固结岩心的固砂渗透率达到4.8μm2,优于常规树脂固砂剂(1.9μm~2)。在非均质多油层中可明显防止高渗透层突进,改善固砂剂注入剖面,实现均匀固砂。现场试验取得良好的防砂效果,验证了该技术可实现均匀固砂和低伤害特性。利用泡沫树脂流体特性实现非均质多油层均匀固砂,达到了提高化学固砂效果和防砂有效期的目的。

水性无机耐高温防腐涂料的研制

以硅烷KH560、甲基三甲氧基硅烷偶联剂、气相二氧化硅和氢氧化钾为主要原料合成水性无机耐高温树脂,为提高涂料的耐热性,选择铜铬黑、磷酸锌、碳酸镁作为主要颜填料,并选用抗开裂粉料、消泡剂、分散剂等提高涂层外观及涂料的施工性能等。结果表明,该涂料有机挥发物低于100mg/L,涂层能在200℃固化成膜,700℃煅烧2h仍具有良好的防腐性能,且附着力好、耐盐雾性能良好。

一种性能优异的水性环氧防腐底漆配方研究

通过双酚A型环氧树脂E-51(EP-51)与聚乙二醇4000(PEG-4000)进行开环反应,合成环氧乳化剂,利用相反转技术制备出了一种水性环氧树脂乳液,研究了环氧/活泼氢当量、固化剂体系、防锈颜料、颜料体积浓度(PVC)对水性环氧涂料性能的影响。

药用高粘度丙烯酸树脂合成研究

目的:药用高粘度丙烯酸树脂Ⅱ的合成与表征。方法:以甲基丙烯酸甲酯与甲基丙烯酸为原料,过氧化苯甲酰为引发剂,通过溶液聚合,制备药用高粘度丙烯酸树脂;通过考察了溶剂浓度、引发剂用量以及反应温度等对目标产物粘度和收率的影响,优化了制备工艺。结果:合成的目标产物通过多种表征,符合中国药典标准。结论:在优化的工艺条件下,合成药用丙烯酸树脂Ⅱ粘度在20~50 mPa·S,收率达到89%。

基于表面能理论的粘结剂-UHPC粘结失效模式分析

为探究粘结剂与UHPC的潜在粘结失效模式及其机理,通过表面能理论建立粘结剂-UHPC的粘附模型和剥落模型,提出粘结失效模式判断准则。选择四种常用界面粘结剂(热熔型改性环氧树脂202、高粘高弹沥青(宝利)、高粘高弹沥青PG-100和SBS改性沥青)作为研究对象。采用接触角法测算UHPC、粘结材料的表面能参数,并计算粘结剂的内聚功和剥落功、粘结剂-UHPC的界面粘附功和界面剥落功,依据失效模式判断准则确定粘结剂-UHPC体系的粘结失效类型。研究结果表明:四种粘结剂-UHPC的界面粘附功排序为树脂202>高粘沥青>沥青PG-100>SBS改性沥青;粘结剂内聚功排序为树脂202>SBS改性沥青>沥青PG-100>高粘沥青。无水条件下,四种粘结剂-UHPC体系的粘结剂内聚功远小于界面粘附功,为粘结剂内聚失效,粘结剂内聚功与拉拔强度具有较强的线性相关性。有水条件下,粘结剂的剥落功大于界面剥落功,失效类型为粘结剂内聚失效。通过附着力拉拔试验以及已有研究成果,综合分析和验证判定结果的有效性。本研究为探明粘结剂-UHPC粘结失效机理、改进粘结材料配伍性具有理论与实际意义。

抗菌型高吸水树脂的制备

本文以壳聚糖、丙烯酸为主要原料,先在壳聚糖分子上引入季铵盐侧链,再与丙烯酸钠采用反相悬浮聚合法合成抗菌型高吸水性树脂。并探索了原料的最佳配比,并对吸水性、保水性、抗菌性的影响条件进行了讨论。

高性能高分子材料体系自立自强发展战略研究

高性能高分子材料具有高强高模、高绝缘、耐腐蚀、耐辐照或绿色低碳等特点,是保障国家安全和国民经济发展的战略性材料之一,广泛应用于航空航天、电子电器、生物医疗等重要领域。本文系统梳理了高性能树脂及工程塑料、有机纤维、生物基树脂及可降解材料、特种橡胶及弹性体四大类高性能高分子材料中的重点品种,分析了国内外重点品种的发展现状和特点。研究发现,目前我国在高性能高分子材料方面已建立起比较完备的化工原料–合成–加工改性–制品应用上下游产业体系,但同时也存在关键原料保障不足、产品应用开发有待拓展等问题。在此基础上,从加强技术创新、推进关键原料保障、组建创新联合体等方面提出对策建议,以期为我国高性能高分子材料体系发展提供参考。

电动汽车功率电子封装用耐高温环氧塑封料的研究进展

本文综述了近年来国内外关于耐高温环氧塑封料(EMC)的基础研究与应用进展,从先进功率电子器件发展对塑封材料的性能需求、传统EMC的高温降解机理、EMC结构与耐热稳定性的关系以及提高EMC耐热稳定性的改性途径等方面进行了阐述。重点综述了多芳环(MAR)型以及含萘型EMC的发展状况。最后对功率电子封装用耐高温EMC未来的发展趋势进行了展望。

一种耐酸耐碱高强树脂的合成及性能

小套管二次固井是一种新型的固井工艺,针对目前由于水泥自身脆性大易气窜和水窜且为碱性固化体、易受压产生裂缝、易受酸性介质破坏的问题,以D-33二元醇和顺丁烯二酸为原料,苯乙烯作为活性稀释剂合成了一种不饱和型聚酯树脂。在树脂体系中引入填料,提高产品韧性及抗压强度。采用傅里叶变换红外光谱仪对树脂进行表征;通过万能试验机对树脂体系进行性能评价。结果表明,目标产物包含羰基、碳碳双键和苯环对位取代结构的特征峰,固化体系为过氧化二苯甲酰/N,N-二甲基苯胺,其在50℃、60℃和70℃条件下的添加量分别为0.2%/0.02%、0.1%/0.02%、0.1%/0.01%,万能试验机测试结果显示,在50℃、60℃和70℃下养护24h后的抗压强度分别约为50MPa、70MPa、90MPa。实验获得了一种聚合时间可调、黏度小、抗压强度高且耐酸耐碱的固井材料,有望在水平井重复压裂改造中大规模使用。

CCF800S/8210双马来酰亚胺树脂基复合材料固化工艺参数与耐热性能的关系

采用热分析方法研究了CCF800S/8210双马来酰亚胺树脂基复合材料的固化工艺参数与耐热性能的关系。结果表明,在250℃以内,随着固化温度的增加,CCF800S/8210双马来酰亚胺树脂基复合材料的耐热性能提高,玻璃化转变温度从310℃提高到350℃。进一步考察了该复合材料在室温和250℃时的力学性能,发现在250℃下力学性能保持率大于51%。因此,该双马来酰亚胺树脂基复合材料体系作为结构材料在航天航空领域有着潜在的应用价值。