高阻隔性助剂应用于纸张耐液性的探讨

通过分析浆内施胶与不施胶、酸性施胶与中性施胶和化工助剂添加顺序对高阻隔性助剂性能的影响,确定在酸性施胶、添加湿强剂而不加填料系统中,先添加高阻隔性助剂可使纸张的吸水性降低。当阳离子松香胶用量1.0%、湿强剂用量0.2%和高阻隔性助剂用量0.25%时,纸张吸水性22.8g/m^2;随着高阻隔性助剂用量从0.25%增加到1.25%,纸张吸水性下降22.8%,边渗透下降28.4%,湿强度和抗张指数提升,纸张的耐液性增加,从而满足纸张在纸吸管、纸杯等领域使用的需要。

植物油基水性双组分清漆的研制

从不同乳液中选择大豆油改性水性聚氨酯分散体和丙烯酸乳液为主体树脂,添加消泡剂、流平剂等制得水性植物漆。研究了大豆油改性水性聚氨酯分散体和丙烯酸乳液配比,以及不同消泡剂、分散剂等助剂与固化剂对漆膜性能的影响。结果表明:当大豆油改性水性聚氨酯分散体质量分数为60%,丙烯酸乳液质量分数为20%,固化剂选用5%的万华269,分散剂选择0.3%的Tego380,以Tego810搭配少量Tego902W为消泡剂(用量0.4%),防沉剂用量为1%,蜡乳液用量为3%时,所得漆膜性能较优,硬度为HB,附着力0级,60°光泽21.7,耐液性均达到国家标准。

Microarc oxidation coating fabricated on AZ91D Mg alloy in an optimized dual electrolyte

Microarc oxidation （MAO） process was conducted on AZ91D magnesium alloy in an electrolyte composed of NazSiO3, NaAlO2, NaEB4O7, NaOH, C3H803 and C6H5Na307 by AC pulse electrical source. The surface and cross-sectional morphologies, film thickness, chemical composition and structure of the coatings were characterized by scanning electron microscopy（SEM）, layer thickness metry, energy disperse spectroscopy（EDS） and X-ray diffraction（XRD）. The corrosiofi resistances of the coatings in a 3.5% NaC1 neutral solution were evaluated by electrochemical impedance spectroscopy （EIS） and potentiodynamic polarization test. The results showed that an optimized electrolyte with a composition of 15 g/L NazSiO3, 9 g/L NaA102, 2 g/L NazB407, 3 g/L NaOH, 5 mL/L C3H803 and 7 g/LC,HsNa307 was developed by means of orthogonal experiment. The coating obtained in the optimized electrolyte had a dense structure and revealed a lower current density, decreased by two orders of magnitude as compared with the magnesium substrate. Meanwhile, the corrosive potentials of the coated samples increased nearly by 73 inV. EIS result showed that the corrosion resistance of the coating was mainly determined by the inner dense layer. The coating primarily contained elements Mg, Al, O and Si and XRD analyses indicated that the coating was mainly composed of MgO, Mg2SiO4 and MgAl204.

Laser surface melting AZ31B magnesium alloy with liquid nitrogen-assisted cooling

Laser surface melting（LSM） is a high-energy surface treatment that allows modification of the microstructure and surface properties of Mg alloys. In the present work, an attempt of LSM on magnesium alloy with liquid nitrogen-assisted cooling（LNSC） was carried out to get the higher cooling rate and improve the surface properties. The experimental results were compared with those of Ar gas protection at room temperature. The samples after LSM with LNSC resulted in a thinner melted layer, a highly homogeneous, refined melted microstructure and formed a lot of worm-like nanocrystals and local amorphous structures. Microhardness of the melted layer with LNAC was improved to HV 90-148 as compared to HV 65-105 of the samples with Ar gas protection. The corrosion resistance of the melted layer in a 3.5% Na Cl solution（mass fraction） was improved because of the grain refinement and redistribution of β-Mg17Al12 phases following rapid quenching associated with the process.

Electrodeposition and corrosion behavior of Zn-Ni-Mn alloy coatings deposited from alkaline solution

The potentiostatic electrodeposition of Zn-Ni-Mn was carried out in an alkaline solution with the addition of Mn salt.The effects of electrolyte Mn2+concentration and deposition potential on the surface morphology,phase structure and corrosion behavior of coatings were studied.The results of corrosion polarization showed that the presence of higher Mn content in Zn-Ni-Mn coatings could lead to the formation of a good passive layer with a 7-fold increase in Rp of coating and a significant decrease in the corrosion current density compared to those of Zn-Ni coating.The XRD and the XPS analyses from the surface of Zn-Ni-Mn after corrosion test showed that the passive layer was composed of zinc hydroxide chloride,zinc oxide,zinc hydroxide carbonate,and manganese oxides.

Motion State Analysis and Seal Ability Study on the Magnetic Fluid Seal of Reciprocating Shaft

The authors have studied the motion mechanism of the magnetic fluid in a reciprocating seal gap,on the basis of which the authors obtain an anti pressure formula of the reciprocating shaft magnetic fluid seal from general Navier Stokes equation.In order to verify the correctness of the anti pressure formula,the authors have calculated the magnetic field distribution of seal structure and have gotten the maximum still anti pressure.Finally,the authors have verified the influence of speed and stroke on the seal anti pressure.

Corrosion properties of plastically deformed AZ80 magnesium alloy

AZ80 magnesium alloys were deformed at 200,250,300,350 and 400℃ with different deformation degree of 50%,75%, 83%,87%and 90%,respectively.The corrosion properties of different deformed AZ80 samples were studied by galvanic test in 3.5%NaCl solution.The results show that plastic deformation could improve the corrosion resistance of AZ80 alloy;and the corrosion rate of AZ80 deformed at 250℃ with the deformation degree of 83%was the lowest,which was 33%of the as-cast AZ80 alloy.Further studies of the microstructure show that the refined grain size and continuously distribution ofβphase around the grain boundary did have a positive effect on the improvement of corrosion resistance of AZ80 alloys.For AZ80 alloys,the smaller the grain size is,the more homogeneous the structure is,and the better the corrosion resistance is.

Preparation of anti-resistant stealthy liposomes by incorporating vincristine with quinacrine and the pharmacokinetics in Sprague-Dawley rats

Aim The objectives of the present study were to prepare stealthy vincristine plus quinacrine liposomes and evaluate the pharmacokinetics in Sprague-Dawley rats. Methods Anti-resistant stealthy liposomes were prepared by incorporating vincristine with quinacrine together using the ammonium sulfate gradient loading procedure. For the pharmacokinetic study, Sprague-Dawley rats were divided into two groups： each rat in the Group Ⅰwas administered intravenously via tail vein as stealthy liposomal vincristine plus quinacrine, and the Group Ⅱ similarly given as a mixture solution of free vincristine plus free quinacrine. The concentrations of vincristine and quinacrine in plasma were measured by HPLC with diode array detection and fluorescence detection, respectively. Results The mean particle size of stealthy liposomes was 135.9 ±7.1 nm and the encapsulation efficiencies of stealthy liposomes were 〉 90% for vincristine, and 〉 85% for quinacrine, respectively. Administered as the stealthy vincristine plus quinacrine liposomes, the plasma exposures of both vincristine and quinacrine were significantly extended, and the mean concentrations of both vincristine and quinacrine were significantly higher compared to those given as the mixture solution of free vincristine plus free quinacrine. The Cmax, t1/2, AUC0-24 h values of vincristine for stealthy liposomal group were significantly increased, but the total clearance Cl values decreased, as compared to those of free drug group, respectively. Similarly, the Cmax, t1/2 and AUC0-24 h values of quinacrine for the stealthy liposomal group were significantly increased, but the total clearance C1 values decreased, as compared to those of free quinacrine. Conclusion The anti-resistant stealthy liposomes are successfully prepared by incorporating vincristine with quinacrine, and the liposomes extend significantly the duration in blood circulation and improve evidently the plasma concentrations of both vincristine and quinacrine.

Study the Effect of Boron and Titanium to Resist Corrosion in the Salt Solution for the Alloy （Al-Cu-Mg）

The alloy （AI-Cu-Mg） alloy important one dating back to the series （2xxx） where copper foundries basic element which represents the number （2）, the study relied on foundries add elements boron （B） and titanium （Ti） and then use a heat treatment （homogenizing process） to improve the corrosion resistance in saline （NaC1 3.5%） of the base alloy （A1-Cu-Mg）, was prepared four types of alloys （A, B, C, D） depending on the chemical composition. The results showed that the corrosion resistance in saline solution was the best resistance in the alloy （D） （A1-2% Cu-2% Mg-0.1% B-1.0% Ti） compared with the rest of bullion when an examination of corrosion of the alloy prepared after homogenizing. But by examining the surface roughness of the alloy ingot turned out that （D） is softer than the rest of the surface alloys and this is due to the addition of boron and titanium together increases surface smoothness in alloys because it works to reduce the grain size.

Effects of KMnO_4 on microstructure and corrosion resistance of microarc oxidation coatings on 2024 aluminum alloy

Microarc oxidation （MAO） coatings were prepared on 2024 aluminum alloy in a Na2SiO3-KOH electrolyte with KNinO4 addition varying from 0 to 4 g/L. The microstructure and phases of the coatings were characterized by scanning electron microscopy （SEM） and X-ray diffractometry （XRD）, respectively. The corrosion resistance of MAO coatings was evaluated by electrochemical potentiodynamic polarization in 5% （mass fraction） NaCl solution. The results show that when KMnO4 is added into base electrolyte, the growth speed of oxide coatings is increased obviously. The main phase of oxide coatings is Al2O3, and the contents of MnO2 and MnEA104 phases are increased at the top of oxide coatings with increasing the concentration of KMnO4. The solute elements participate in forming the oxide coatings. When a proper concentration of KMnO4 （2.5 g/L） is added into the base solution, the micropores of the MAO coatings are small and compact, and the corrosion resistance of oxide coatings is increased largely.

Effect of liquid nitriding at 400–670 ℃ on microstructure and properties of C110 Steel

Liquid nitriding of Cll0 steel was conducted in a wide range of temperatures （400-670 ℃） using a kind of chemical heat-treatments, and the hardness, mechanical and corrosion properties of the nitrided surface were evaluated. Experimental results revealed that the microstructure and phase constituents of the nitrided surface alloy are highly depended on the processing condition. When C 110 steel was subjected to liquid nitriding at 430 ℃, the nitrided layer was almost composed of a thin e-Fe2-3N layer. When C 110 steel was subjected to liquid nitriding at 640 ℃, the phase composition of the nitrided layer was greatly changed. The nitrided layer depth increased significantly with increasing the treating temperature. The liquid nitriding effectively improved the surface hardness. After liquid nitriding, the absorption energy of the treated sample decreased and the tensile strength increased by Charpy V-notch （CVN） test. But the elongation of treated sample decreased. The reason is that the nitrided layer of sample is hardened and there is brittlement by diffusion of nitrogen atom. Despite of treatment temperature, the liquid nitriding can improve the corrosion. After being nitrided at 430 ℃, the nitrided layer of the C110 steel was mainly composed by e-Fe2 3N, which has excellent corrosion resistance and high microhardness, the nitrided sample has the best corrosion resistance. After nitriding temperature over 580 ℃, especially at 680 ℃, the sample＇s surface was covered by the thick oxide layer, which has very low hardness and corrosion resistance. So, the corrosion resistance of samples is severely compromised.

卫浴家具(国家监督抽查)

组织部门:国家市场监督管理总局抽查范围:河北、浙江、安徽、福建、河南、广东、四川等7个省53家企业生产的53批次产品发布时间:2019年3月抽查概况:对产品的台盆柜台面理化性能(耐液性、耐湿热、耐干热、抗冲击强度)、木制部件表面漆膜理化性能(耐液性、耐湿热、耐干热、附着力、耐冷热温差、耐磨性、抗冲击)、软硬质覆面理化性能(耐液性、耐湿热、耐干热、耐冷热温差)、金属表面涂层理化性能(硬度、冲击强度、附着力)、产品耐水性、落地式柜台面强度(台面垂直静载荷、沙袋加载)、悬挂式柜(架)极限强度、木质产品有害物质限量(甲醛释放量、重金属含量)、产品放射性等25个项目进行了检验。本次抽查,有5批次产品不符合标准的规定.

Efficacy and mechanism of a compound epirubicin plus quinine injection for the treatment of drug--resistant breast cancer

A single drug chemotherapy fails to eliminate residual cancer cells due to the existence of the multidrug resistance （MDR）. In the present study, we aimed to develop a compound epirubicin plus quinine injection, to characterize the efficacy in treatment of the drug-resistant breast cancer, and to reveal the involved mechanisms. The HPLC-UV methods were developed for quantifications, and the evaluations were performed on the drug-resistant human breast cancer MCF-7/adr cells using a high content screening system. Results demonstrated that the compound epirubicin plus quinine injection was able to effectively block the drug efflux, exhibiting an evidently overall efficacy in treatment of the resistant breast cancer cells by direct killing effect and by apoptosis-inducing effect. In the formulation, quinine played multiple roles in blocking drug efflux and in inducing the apoptosis of the resistant breast cancer cells. The apoptosis signaling pathways were associated with a cascade of reactions by activating Caspase family and by inhibiting Bcl-2 family. In conclusion, the present study preliminarily revealed the efficacy and mechanism of the compound epirubicin plus quinine formulation in treatment of the drug-resistant breast cancer, and offered a potential strategy to overcome drug resistance in cancer treatments.

Improvement in the liquid zinc corrosion resistance of high Nb-TiAl alloys by pre-oxidation in a SiO_2-powder pack

The influence of pre-oxidation on the liquid zinc corrosion resistance of high Nb-TiAl alloys was investigated. The pre-oxidation was performed by heating the specimens, buried in silica powder and encapsulated in a silica tube under a vacuum of 1.3x10-5 Pa at 950℃ for 12 h. Experimental results showed that the preoxidized sample exhibited much higher liquid zinc corrosion resistance than that for the comparative samples. This excellent liquid zinc corrosion resistance was attributed to the formation of high-quality oxide scale during peroxidation. The corrosion of all the samples in liquid zinc was caused by a localized breakdown in the oxide scales. The continuous and dense oxide scale formed during preoxidation substantially may prevent the liquid zinc from diffusing to the substrate, and its good continuity may also reduce the possibility of localized breakdown in the oxide scale.