大孔径聚四氟乙烯筛板的加工及应用

采用聚四氟乙烯(PTFE)车削板为原料,机械加工生产大孔径PTFE筛板,对筛板与车削板进行了拉伸性能分析。结果表明,随筛板孔距的增加,其拉伸强度、拉伸屈服应力及拉伸断裂应力均提高;随筛板孔径的增大,其拉伸强度、拉伸屈服应力及拉伸断裂应力均降低。试验发现,厚度为0.40mm、孔型(孔径×孔距)为1.5mm×1.5mm及厚度为0.50mm、孔型为1.5mm×1.5mm及2.0mm×2.0mm三种型号筛板的拉伸性能优良,透氨性能好,适合oce655、oce642S、Admiral AD及QU和DH-9916B型等多种型号的高速晒图机使用。     

聚氨酯橡胶筛板研制成功

选煤、选矿、采石、钻井泥浆回收及城市垃圾处理等部门都离不开各种规格型号的筛机。筛板是筛机上确保筛分质量的核心部件它常年在震动、冲击、摩擦的恶劣条件下工作，极易破损。清洗使用的筛板是不耐磨、噪音大、寿命短、更换频繁的钻孔、冲孔或拼焊的碳钢和不锈钢筛板，为克服金属筛板的上述缺点，山西省化工研究所参照进口同类筛板的结构，采用本所技术，研制成功不阻塞型聚氨酯橡胶筛板。其主要特点为：①耐磨性好，使用寿命长，一般为钢制筛板的3—5倍②耐温性好，可以在水或油介质的条件下长期工作；③耐腐蚀性好，可在PH6—12的酸碱…     

聚氨酯弛张筛板的研制

以聚酯多元醇、TDI、MOCA为原料研制了弛张筛板用浇注型聚氨酯弹性体。采用离心浇注法成型。讨论了原料、配方和成型工艺对弛张筛板性能的影响。所研制的筛板性能优异、质量稳定、使用寿命半年以上。     

聚氨酯驰张筛板的研制

以聚酯多元醇,ＴＤＩ、ＭＯＣＡ为原料研制了驰张筛板用浇注型聚氨酯弹性体。采用离心浇注法成。讨论了原料,配方和成地驰张筛板性能的影响。所研制的筛板性能优异,质量稳定,使用寿命半年以上。     

聚四氟乙烯纤维滤料及其制备方法

本发明提供一种聚四氟乙烯纤维滤料及其制备方法，它具有极强的高温化学稳定性、过滤精度高、耐磨损、使用寿命长、应用范围广等优点，尤其适用于工况环境恶劣的过滤需要。本发明的聚四氟乙烯纤维滤料是使用聚四氟乙烯纤维滤布经过浸渍处理，再进行覆膜或涂层处理；所述浸渍处理采用聚四氟乙烯溶液进行浸渍；所述聚四氟乙烯溶液包括：聚四氟乙烯和质量分数30％-40％；聚苯酯的质量分数20％-30％；粘合剂的质量分数1％-3％；水，余量。     

氯气处理工艺的完善

通过增加事故氯气处理装置、改进氯气冷却方式、改装泡沫干燥筛板塔、更换氯气泵及完善氯气自控手段等措施，完善了氯气处理工艺，达到了节电、提高氯气质量及延长设备使用寿命的目的。     

聚四氟乙烯在氟塑料换热器方面的应用

阐述了聚四氟乙烯在氟塑料换热器方面的应用研究状况,分析了聚四氟乙烯换热器所具有的优势,如成本低、防腐防垢、体积小和质量轻等及聚四氟乙烯复合改性。重点讨论了聚四氟乙烯换热器在不同领域的应用研究,并进一步明确了对加强聚四氟乙烯换热器综合性能的研究方向。     

晒图技术应用及安全操作

重氮氨熏晒图技术被广泛应用于石油企业。本文重点推介重氮氨熏晒图技术、标准化操作、晒图常见故障排除、员工属地管理等知识点,方便企业对新员工培训及标准化管理。     

晒图技术应用及安全操作

重氮氨熏晒图技术被广泛应用于石油企业。本文重点推介重氮氨熏晒图技术、标准化操作、晒图常见故障排除、员工属地管理等知识点,方便企业对新员工培训及标准化管理。     

生料磨隔仓板的技术改造

我厂为大型湿法水泥生产厂，生料磨主要有 ２．４ｍ×１３ｍ及　２．６ｍ×１３ｍ磨机。自投产以来，磨 机隔仓板存在易松动、断裂，隔仓板缝隙过宽等问 题。从而造成球、段串仓，台时产量低、能耗高、细度 波动大。为解决这一问题，我们对生料磨隔仓板进行 技术改造，经过近两年的生产实践，效果显著。 １原因分析 １）磨机隔仓板由筛板及中心圆筛板通过螺丝联 接而成（见图１），筛板与中心圆筛板依靠筛板凸台定 位。筛板凸出部位无保护措施，这样磨机运转过程 中，研磨体直接对凸出部位进行冲击，从而造成…     

核电用聚四氟乙烯密封件老化状态研究及使用寿命预测

选用核电用聚四氟乙烯（PTFE）材料,在不同温度下（315、300、285 ℃）进行高温加速老化试验。通过傅里叶变换红外光谱仪（FTIR）、扫描电子显微镜（SEM）、热失重分析仪（TG）对材料的微观结构、热性能进行了表征分析,然后采用热老化和热失重法建立了2种老化寿命预测模型。结果表明,随着老化时间的延长,PTFE的FTIR谱图出现了明显的红移,表面出现了明显的孔洞,材料的热稳定性和力学性能变差;寿命预测模型显示热失重法与热老化法推算出的寿命预测结果基本一致,并且随着使用温度的增加,误差进一步缩小,这表明热失重法对PTFE材料使用寿命的推算是可靠的,这种简单易行的方法非常适用于PTFE材料。     

聚四氟乙烯油封在车辆上的应用研究

通过对影响油封密封性的主要因素以及油封在车辆上的使用环境分析,选用了丁腈橡胶、填充聚四氟乙烯（PTFE）、氟橡胶、PTFE复合材料4种密封材料,并对所制成的不同结构的油封进行了对比试验。结果证袜,PTFE复合材料具有良好的耐高低温性、自润滑性、耐磨性和耐压性。PTFE复合油封能提高车辆的密封性,满足车辆的使用要求。     

Study on preparation and anticorrosive performance of a new high hydrophobic anticorrosive coating

Water-based anticorrosive coatings have poor water resistance, which easily lead to coating deterioration and metal corrosion. In order to improve the anticorrosion performance of waterborne coating, herein, the polytetrafluoroethylene/dimethyl siloxane/epoxy resin (PTFE/PDMS/EP) hydrophobic anticorrosive coating was prepared by layer-by-layer construction. The spatial structure and microscopic morphology of the hydrophobic coating were analyzed by XRD, FTIR, and SEM. The hydrophobicity and corrosion resistance of the composite coating were analyzed by hydrophobicity test, electrochemical polarization curve, hydrophobicity and corrosion resistance test of the mixed layer, Tafel polarization curves, and AC impedance spectrum. The results showed that the water contact angle of PTFE/PDMS/EP coating reached 141° and the protection efficiency of PTFE/PDMS/EP coating was 98.62%. After soaking for 7 days, the corrosion process still stays at the initial stage, which was mainly due to the good sealing and barrier properties and high anticorrosion efficiency of PTFE/PDMS/EP coating. The coating has high corrosion protection efficiency and long service life, which is of great significance to metal corrosion protection in harsh marine environments.     

Porous polytetrafluoroethylene (PTFE) electret films: porosity and time dependent charging behavior of the free surface

Electrically charged porous polytetrafluoroethylene (PTFE) films are often discussed as active layers for electromechanical transducers. Here, the electric charging behavior of open-porous PTFE films with different porosities is investigated. Optimized electric charging of porous PTFE films is determined by variation of charging parameters such as electric fields and charging times. Maximum surface potentials are depending on the porosity of the PTFE films. Suitable charging leads to high surface potentials observed on non-stretched or slightly stretched porous PTFE films. Further increase of charging fields yields decreasing values of the surface potential accompanied with an increase of conductivity.     

氨基磺酸镀液制备长寿命Ti/PTFE-F-PbO2电极及在有机物降解中的应用（英文）

A polytetrafluoroethylene (PTFE)-doped PbO2 electrode on a Ti substrate was prepared by galvanostatic method from the sulfamic acid bath (Ti/PTFE-F-PbO2-I) or nitric acid bath (Ti/PTFE-F-PbO2-II). Scanning Electron Microscopy revealed that the Ti/PTFE-PbO2-I electrode had a more regular morphology with smaller size crystals than the Ti/PTFE-F-PbO2-II electrode. On the basis of the results of both the accelerated electrolysis test and the empirical formula for estimating the service life of an electrode, the service life of the Ti/PTFE-PbO2-I electrode was predicted to be more than 7 years under conventional electrolysis conditions (0.1 A·cm-2). During the treatment of 4-chlorophenol-contaminated water, the Ti/PTFE-PbO2-I anode showed both a good electro-catalytic activity and high electrochemical stability, exhibiting an excellent potential application.     

国产聚四氟乙烯纤维的特性与应用

介绍了聚四氟乙烯(PTFE)的化学、物理等特性及其应用。PTFE为大分子线型结构,熔点327℃,分解温度在415℃以上。PTFE纤维具有优良的耐腐蚀性,低摩擦因数,不燃,能耐强酸、强碱、强氧化剂等强腐蚀性试剂或溶剂,耐高、低温性能优良。用PTFE纤维制成的滤材广泛应用于垃圾焚烧、高硫煤除尘等领域。     

聚四氟乙烯纤维的成型方法

聚四氟乙烯(PTFE)纤维,具有高度的化学惰性、低摩擦系数,极好的绝缘性和高低温稳定性,优良的耐老化性和抗紫外辐射性以及极小的吸水率等优异特性,在材料领域引起广泛关注。该文重点介绍了聚四氟乙烯(PTFE)纤维的几种制备方法,包括膜裂纺丝法、糊状挤压纺丝法、乳液纺丝法、凝胶状挤压纺丝法及PTFE共聚物熔体纺丝法,并展望了我国PTFE纤维的发展前景。     

Effect of cathode binder on capacity retention and cycle life in transition metal phosphate of a rechargeable lithium battery

With an objective of understanding the differences in the capacity retention behavior and cycle life of cathode consisting transition metal phosphate, Cr_0.5Nb_1.5(PO₄)₃, active material and the binder polyvinylidene fluoride (PVDF) or polytetrafluoroethylene (PTFE), the role of these binders have been analyzed. An electrochemical analysis of the active material mixed with the binders PVDF or PTFE reveals that the PTFE cell experiences an additional discharge capacity of 93 mA h g⁻¹ during the discharge cycle compared to the PVDF cell. The results of X-ray photoelectron spectroscopy studies of the PTFE mixed cathode reveals nearly the same intensity of F (1s) spectra for before and after discharge cycles suggests that the fluorine atom is not decomposed but permits high utilization of the reactant to be achieved in the cathode during discharge/charge cycles. A remarkable improvement in cell performance in terms of capacity and cycle life for PTFE suggests that the binder PTFE should be an attractive candidate in lithium batteries than that of PVDF.     

聚四氟乙烯在仪表防腐上的应用

介绍聚四氟乙烯（PTFE）的性能,比较各种常用防腐材料的耐化学药品性能的优劣,给出PTFE在仪表防腐上的常用工艺,并介绍了PTFE在仪表防腐上的实际应用。     

Recycling and application of wasted polytetrafluoroethylene via high‐energy ball milling technology for nitrile rubber composites preparation

Wasted polytetrafluoroethylene fibers were recycled using high‐energy ball milling technique, and the recylced polytetrafluoroethylene (r‐PTFE) was employed to prepare nitrile rubber (NBR)/r‐PTFE composites. The structure of r‐PTFE and properties of NBR/r‐PTFE composites were investigated by polarized optical microscope, laser particle size analyzer, differential scanning calorimetry, and scanning electron microscopy, respectively. The results show that increasing the milling time from 4 to 7 h leads to decreasing the average particle size, the degree of crystallinity and the number‐average molecular weight of r‐PTFE, whereas no obvious change is found by further prolonging the milling time. It is also clear that the NBR/r‐PTFE composite with the r‐PTFE obtained from a longer milling time possesses a higher mechanical and solvent resistance property. Compared with pure NBR, NBR/r‐PTFE composites with r‐PTFE for 7 h milling show a 21.9% increase in modulus at 300% and 27.8% decrease in swelling index. POLYM. ENG. SCI., 56:643–649, 2016. © 2016 Society of Plastics Engineers