石墨烯对海上风电叶片底漆的性能影响研究

通过在涂层体系中添加石墨烯或用石墨烯代替防锈颜料的方法,确定石墨烯在风电叶片底漆中的作用,并明确最佳用量。选用环氧改性聚氨酯体系的海上风电叶片底漆,分别添加不同比例的石墨烯或使用石墨烯部分代替体系中的防锈颜料,研究2种情况下底漆的各项性能。结果表明:石墨烯对底漆耐酸性、耐盐雾性有显著的影响。将石墨烯添加至现有的涂层体系中时,底漆的耐酸性和耐盐雾性随着石墨烯用量的增加呈现先提高后降低的趋势;当使用石墨烯部分替代防锈颜料时,漆膜的耐盐雾、耐酸性明显下降。石墨烯在防腐底漆的使用中,与现有的涂层体系相匹配效果更好,适量添加石墨烯可改善底漆的防腐性能。相反,石墨烯部分替代防锈颜料会降低涂层的性能。     

HF-05型聚氨酯防滑漆

化工部海洋化工研究院研制和生产的HF－05型聚氨酯防滑漆由防锈底漆D－31、弹性中间层Z－2、耐候防护面漆M－21或M-31及防滑粒粒组成。底漆、中间层和面漆均为双组分聚氨酯。固化后的涂层有优异的防锈防腐蚀性能、极好的弹性和韧性、优良的耐介质、耐油、耐大气老化和耐磨性，附着力好，摩擦力大。由于采用了综合性能很好的厚涂弹性中间层（厚度可达数毫米）和韧性好的底漆、面漆相配合，涂层的抗冲击性特优。一次施工正常使用寿命在5年以上。该漆可用于船舶甲板、直升飞机起降甲板、舷梯、走道、货舱、海上油气平台、港湾设施、车间及仓…     

工业用改性环氧低表面处理底漆的研制

合成一种分子结构较大的异氰酸酯组分,作为环氧防腐底漆的固化剂,用于改性环氧底漆,使涂膜具有聚氨酯的柔韧性和环氧树脂的附着力,配以磷酸盐活性防锈颜料,使该防锈涂料具有良好的防锈性能、高度的弹性和柔韧性、优异的附着力,用于低表面处理的钢铁表面,可直接刷涂在旧的涂膜上,对底材处理不彻底的钢铁表面也表现出优异的防腐性能。     

涂料及无机颜料

青岛研制出军用甲板防滑漆 由青岛捷德化工集团有限公司和山东海洋大学共同研制的军用甲板防滑漆,最近在青岛通过了山东省科委和南京军区共同主持的技术鉴定。该漆由底漆、弹性中涂漆和面漆组成,均为改性聚氨酯型,自配套性能好,其中防锈底漆已获中国专利。该漆的特点是:有优异的防锈、防护和防滑性能;涂层弹性和韧性好,能耐重载冲击,耐钢板热胀冷缩引起的形变,长期使用不开裂、不脱落;防滑、防磨、耐油、耐化学品性能好,耐海洋性气候;可用常规方法施     

高性能环保无铬卷钢涂料的制备与性能研究

为了制备高性能无铬卷钢涂料,探讨了无铬防锈颜料、无铬底漆、卷钢基板种类及面漆类型对无铬卷钢常规性能以及耐盐雾性能的影响。结果表明：采用硅钙离子交换型防锈颜料制备的涂料耐盐雾性能最好;无铬环氧底漆的铅笔硬度、耐划伤性、切边盐雾和平板盐雾性能表现最好,但是切边盐雾要劣于聚酯和聚氨酯底漆;无铬卷钢底漆配合不同的面漆都表现出较为优异的性能;基板的类型对无铬卷钢涂料的常规性能影响不大,其中低铝锌铝镁基板的耐盐雾性能最好;无铬卷钢涂料与有铬卷钢涂料性能相当,但有铬卷钢涂料的耐盐雾性能稍优于无铬卷材涂料,尤其是切边盐雾和划线盐雾。综上,制备的无铬卷钢涂料可以替代有铬卷钢涂料。     

水性带锈防腐涂料的制备及性能分析

制备了一款水性偏二氯乙烯锈转化底漆及水性丙烯酸聚氨酯面漆。对涂层配套性进行了分析,讨论了锈转化剂添加量对偏二氯乙烯底漆锈转化性能的影响,通过正交实验确定了水性丙烯酸聚氨酯面漆配方中防锈颜填料与树脂的配比,分析了不同锈层厚度对水性带锈防腐涂料涂膜性能的影响。     

钙铁颜料改性及在防锈漆中的应用

本文论述了改性钙铁颜料的防锈机理,颜料改性处理方法,以及它在酚酸底漆、醇酸底漆、环氧酯底漆、聚氨酯底漆等防锈漆中的应用.     

水性醇酸防锈底漆的防锈性和贮存失干现象探讨

采用水性醇酸树脂配制了水性醇酸防锈底漆。通过与溶剂型醇酸防锈底漆的性能比较,探讨了水性醇酸防锈底漆的防锈性和贮存失干现象。     

钢结构重防腐涂层典型配套的水性化研究

研制开发的钢结构水性环氧防锈底漆、水性环氧富锌底漆、水性环氧防腐中间漆和水性丙烯酸聚氨酯面漆系列产品性能接近或达到行业标准(港口机械钢结构防腐涂层技术要求JT/T 733—2008)的技术要求,产品具有明显的竞争优势。     

油罐用聚氨酯改性环氧树脂基防腐底漆的研制

采用聚氨酯改性环氧树脂为基料,环己酮、甲基异丁基酮和2-庚酮(MAK)为混合溶剂,三聚磷酸铝和磷酸锌、云母氧化铁红作为防锈颜填料,制备聚氨酯改性环氧树脂基防腐底漆,研究了基料、混合溶剂和防锈颜填料等因素对底漆防腐性能的影响。利用红外光谱、接触角测试、机械性能测试、电化学交流阻抗谱、耐腐蚀介质测试、单因素和正交试验等方法检测底漆的防腐性能。结果表明:混合溶剂质量比为5∶4∶1的清漆涂层阻抗为1.32×1010Ω·cm2;颜基比(P/B)为0.8~0.9、三聚磷酸铝与磷酸锌质量比为6∶4、厚度为75~90μm的色漆涂层阻抗高达2.1×1010Ω·cm2,涂层电容低至7.2×10-11F/cm2;底漆具有优异的机械性能和防腐性能,能够满足石油储罐的防腐技术要求。     

AZ91D镁合金表面不同树脂体系富镁涂层的保护性能

采用划叉浸泡实验,电化学交流阻抗(electrochemical impedance spectroscopy,EIS),开路电位(open circuit potential,OCP)及动电位扫描研究了不同类型的环氧树脂对于AZ91D镁合金的表面的富镁涂层的保护性能的影响。结果表明环氧618-593构成的富镁涂层防护性能较差;环氧6101-TY650制备的富镁涂层可明显改善涂层对破损处镁合金基体的保护作用,但涂层本身长期防护性能较差;环氧618-T31构成的富镁涂层对AZ91D镁合金的防护作用较强,适宜制备镁合金表面的富镁涂层。3种环氧涂料中加入镁粉颗粒制备的富镁涂层均可对缺陷处裸露的AZ91D镁合金基体提供保护,从而延长漆膜的破坏时间。涂层中的镁粉颗粒被激活后,为镁合金的基体提供了一定程度的阴极保护作用,减缓了镁合金基体的腐蚀。     

Interphases in the Adhesive Bonding of Fluoropolymers

Strong and durable adhesive bonds may be made between polytetrafluoroethylene (PTFE) and either cyanoacrylate (CA) or epoxy adhesives, if the PTFE surface is modified by the use of a “primer” such as triphenylphosphine (TPP) or diaminodiphenylmethane (DDM). The primer mixes with the PTFE surface, and the modified surface is then capable of forming an interphase, tens to hundreds of nanometers thick, where interpenetration of the adhesive and adherend occurs. Using CA adhesives, PTFE/CA/PTFE block compression shear bond strength (ASTM D4501-85) of over 10 MPa can be achieved, with failure occurring cohesively. Initial work with epoxy adhesives indicates that the use of DDM primer gives adhesive bonds comparable in strength with those produced by modification of the fluoropolymer surface by sodium naphthalenide.     

Germacrene D Cyclization: An Ab Initio Investigation

Essential oils that contain large concentrations of germacrene D are typically accompanied by cadinane sesquiterpenoids. The acid-catalyzed cyclization of germacrene D to give cadinane and selinane sesquiterpenes has been computationally investigated using both density functional (B3LYP/6-31G^*) and post Hartree-Fock (MP2/6-31G^{* *}) ab initio methods. The calculated energies are in general agreement with experimentally observed product distributions, both from acid-catalyzed cyclizations as well as distribution of the compounds in essential oils.     

流行性乙型脑炎病毒E蛋白上与病原性相关的氨基酸

目的 分析比较乙脑病毒弱毒株at222与其强毒株AT31全基因核苷酸序列，探索与乙脑病毒病原性相关的氨基酸。方法 由日本基因公司合成多核苷引物，以RT-PCR合成cDNA，筛选出阳性克隆。用Sanger法测定at222与AT31株的全基因序列。结果 全基因序列分析比较显示，非编码区3个不同核苷苷酸均出现在3’－端。编码蛋白氨基酸变化分别是E蛋白上3个，NSI蛋白上3个，NS蛋白上2个，NS4a蛋白上1个，NS4b蛋白上1个，NS5蛋白上2个。结论 强弱毒株间2个变异部位与以前报道一致，且其中AT31的E138位点上E氨基酸为强毒株JaGAr01、JaOArS982、Beijing－l和SA14所共有，而at222E138位点上K氨基酸为弱毒株SA14－14－2所共有。E蛋白上E138、E176位点上氨基酸决定了乙脑病毒病原性。     

Isolation and Characterization of a Docosahexaenoic Acid-Phospholipids Producing Microorganism Crypthecodinium sp. D31

Thirty-four strains of docosahexaenoic acid (DHA)-producing microorganisms were newly isolated from brackish areas in Japan. These strains showing various compositions of fatty acids. Especially, the fatty acids produced by one of the strains, named D31, had a high DHA content (over 60 % of the total fatty acids) and the simple fatty acid composition (16:0, 18:0, 18:1 and DHA without any other polyunsaturated acids). Although most oleaginous microorganisms accumulate DHA as triacylglycerol, the strain D31 accumulated DHA mainly as a polar lipid (79.4 % of total DHA), especially as phosphatidylcholine (71.4 % of polar DHA). This strain D31 was identified as a related species of Crypthecodinium cohnii on the basis of phylogenetic analysis. Crypthecodinium sp. D31 showed high DHA productivity when cultivated in a medium containing glycerol as the carbon source and a mixture of yeast extract and polypeptone as the nitrogen sources, with a salinity that was equivalent to 50 % of that of seawater and a pH in the acidic range (<pH 6.0). Crypthecodinium sp. D31 is considered as a promising producer of high-purity DHA-containing phospholipids.     

钝化镀锌板基板对彩涂板涂层附着力的影响研究

在实际生产的环境下,实验分析在环氧(底漆)-聚酯(面漆)和聚酯(底漆)-聚酯(面漆)涂层体系条件下,使用钝化镀锌板作基板对彩涂板涂层附着性能的不同影响,在实验中选取以T弯和反向冲击功2个典型代表涂层附着力性能指标作为分析对象,对比了其在较短时间尺度上的变化情况,实验结果表明:在使用钝化基板的情况下,2种涂层体系的在线附着性能没有明显变化,但使用环氧底漆较聚酯底漆有更好的附着力性能时效特性,本文对其可能的原因也进行了讨论。     

TLC and <Superscript>31</Superscript>P-NMR Analysis of Low Polarity Phospholipids

High-performance TLC and ³¹P-NMR were assessed as methods of observing the presence of numerous low polarity phospholipids: bis-phosphatidic acid (BPA), semi-lyso bis-phosphatidic acid (SLBPA), N-acyl phosphatidylethanolamine (NAPE), N-(1,1-dimethyl-3-oxo-butyl)-phosphatidylethanolamine (diacetone adduct of PE, DOBPE), N-acetyl PE, phosphatidylmethanol (PM), phosphatidylethanol (PEt), phosphatidyl-n-propanol (PP), phosphatidyl-n-butanol (PB). Both techniques are non-discriminative and do not require the prior isolation of individual lipids. It appears that 2D TLC is superior to ³¹P NMR in the analysis of low polarity phospholipids. All phosphatidylalcohols were well separated by 2D TLC. However, some compounds which can present difficulty in separation by 2D-TLC (e.g., SLBPA and NAPE; or DOBPE and N-acetyl PE) were easily distinguished using ³¹P NMR so the methods are complimentary. A disadvantage of 2D TLC is that Rf values can vary with different brands and batches of TLC plates. The chemical shifts of ³¹P NMR were less variable, and so a library of standards may not be necessary for peak identification. Another advantage of ³¹P NMR is the ease of quantification of phospholipids. The applicability of the methods was tested on natural extracts of fish brain and cabbage stem.     

Evaluation of physico-chemical changes in sub-layers of multi-layer anticorrosive marine paint systems: Plasticizer and solvent release

Increased awareness of the environmental impact of solvent-based anticorrosive marine coatings has urged to predict long-term performance of a coating in order to make dry-docking less frequent. Each coating system was composed by three layers: topcoat, \ and primer. All samples were exposed to four different standard artificial weathering tests: a neutral salt spray test (NSS ISO 9227) and three cycles (QUV ASTM G53, ASTM D5894 and ISO 20340). Besides, the same samples were exposed to a natural weathering during 4 years in three different locations: Pipady (south of France), Kure Beach (North Caroline, USA) and Bandol (south of France). This research project focused exclusively on the degradation of the basecoat and primer by FTIR spectroscopy, PyGC/MS and dynamical mechanical analysis. Basecoat and primer binders formulated with dibutylphtalate as a plasticizer were found to strongly evolve during artificial cycle tests. An extensive diffusion of plasticizer was observed with a rise in T_g of the epoxy binder as high as 40 °C. The impact of these physico-chemical changes on the corrosion protection properties of the whole system were discussed based on electrochemical impedance spectroscopy (EIS) in 3 wt% NaCl solution, SEM observations, pull-off test and measurements of delaminated areas.     

Er,Cr:YSGG laser irradiation influence on Y-TZP bond strength to resin cement

The aim of this study was to evaluate Y-TZP surface pretreatment with different protocols on microshear bond strength (μSBS) ceramic-cement interface. One hundred and sixty pre-sintered IPS e-max ZirCAD (Ivoclar-Vivadent) blocks were randomly divided into sixteen groups according to surface treatment (n=20): G1- no treatment (control); G2- ceramic primer; G3- tribochemical silica coating; G4- tribochemical silica coating+primer; G5- airborne particle abrasion (Al₂O₃); G6- airborne particle abrasion (Al₂O₃)+primer; G7- Er,Cr:YSGG laser; G8- Er,Cr:YSGG laser+primer. All specimens were sintered before surface treatment, except lasers groups, which were sintered after laser irradiation. Ceramic blocks were bonded with Panavia F resin cement (Kuraray, Okayama, Japan) (n=10) or RelyX ARC (3M ESPE, St. Paul, MN, USA) (n=10). The μSBS tests were carried out in a universal testing machine at a speed of 1mm/min after 24 h (n=5) or 6 months storage (n=5). Differences were found for both resin cements and storage conditions in relation to μSBS values (p<0.05). However, no significant difference for interaction between factors was observed in cemented blocks with RelyX ARC. Panavia F resin cement showed significant differences for interaction between factors (p<0.05). Laser treatment was not sufficient to increase μSBS values between Y-TZP and resin cements. Tribochemical silica coating followed by primer achieved the highest immediate μSBS values. The storage did not affect negatively μSBS values to both evaluated cements.     

Etching efficacy and bonding performance of resin to lithium disilicate ceramic using self-etching primer with different reaction times

The purpose of this study was to evaluate the effect of self-etching primer on glass-ceramic at different reaction durations. Fifty specimens of lithium disilicate ceramic were divided into five groups based on the surface treatment (n?=?10); Group A (control): no treatment, Group B: treated with 5%-hydrofluoric acid (HF) followed by a primer, Group C: treated with one-bottle system self-etching primer; (Monobond Etch & Prime (MEP)) for 20?s plus 40?s reaction time, Group D: MEP for 20?s plus 80?s reaction time, Group E: MEP for 20?s plus 120?s reaction time. The outcomes of shear bond strength (SBS), failure mode and surface topography were assessed. Statistical analyses were performed using ANOVA, Chi-squared test and Tukey’s test at a significance level of α?=?0.05. The control group (A) demonstrated the lowest SBS value (0.11MPa, SD:0.022) which was statistically significant, compared to other groups (P?<?0.0001). However, the mean SBS values were not statistically significant among the other four experimental groups. Group B yielded the highest SBS value (13.79MPa, SD:3.57), although was not statistically significant when compared to group C (11.60MPa, SD:1.23), group D (11.94MPa, SD:1.24), and group E (11.67MPa, SD:0.64), P?>?0.05. Scanning electron microscope (SEM) showed increased surface roughness in HF/primer specimens compared to MEP. Stereomicroscopy analyses showed that the main mode of failure was adhesive failure in group A, while was mixed failure in the other experimental groups, with no statistical significance between the groups. The self-etching system can be considered as an alternative for the glass-ceramic surface treatment without compromising the bond strength. The time required for conditioning seems to be sufficient with 40?seconds reaction time.