增稠剂刺云实胶在面膜中的应用研究

本文主要讨论一种增稠剂刺云实胶在面膜中的应用,对其单一使用的用量和与常用增稠剂复配使用情况进行了实验研究,结果表明面膜中单独应用刺云实胶或复配其他增稠剂,能产生丝滑不黏腻的肤感体验且稳定性较优。     

复配体系中主剂AEO-15的最佳实验条件测定

为提升复配体系的降黏效果,对主剂AEO-15的最佳实验条件进行了测定,考察了乳化温度、乳化时间、油水比、含水率、机械搅拌强度和搅拌时间等因素的影响,最终确定出了主剂AEO-15的最佳实验条件,为复配实验提供了重要依据。通过实验确定了AEO-15的质量分数对降黏效果的影响趋势,结果证明了单独使用AEO-15降黏剂并不稳定,但其可以作为复配型降黏剂的一种试剂。     

增黏剂对低密度改性聚硫密封剂粘接性能影响研究

研究了不同种类的增黏剂以及复配后的增黏体系对改性聚硫密封剂粘接性能的影响。研究结果表明:单独使用增黏树脂、硅烷偶联剂和钛酸酯偶联剂,增黏效果不如复配使用的效果好;其中,2份E-44和1份LT550的复配效果最好,可与多种基材具有良好的相容性且粘接强度较高。为实现改性聚硫密封剂与多种基材良好的粘接性能,增黏剂的复配是有效解决方案之一。     

表面活性剂对压敏胶在办公废纸再生过程中的影响

为了分析废纸中的胶黏物,采用胶黏物染色的方法对标签纸中胶黏物进行染色,使之与白色浆料形成色差对比,从而有助于用扫描法分析胶黏物的存在形式。论文系统地探讨了阳离子、阴离子、非离子表面活性剂对压敏胶胶黏物的作用以及对废纸浆的影响。对筛选前后纸片的胶粒尘埃度(NPM)和平均胶粒粒径的分析结果表明:阳离子、阴离子表面活性剂对胶粒有一定的分散作用,阳离子表面活性剂的分散作用尤为突出,而非离子表面活性剂有略微的凝聚作用。处理后纸浆滤液的浊度和胶黏物的接触角的变化规律也证实了以上结论。研究结果可为废纸脱墨过程中表面活性剂对脱墨纸浆中胶黏物的影响规律提供理论依据。     

阳离子改性滑石粉处理OCC纸浆中胶黏物的研究

研究了阳离子改性滑石粉处理废旧瓦楞纸箱(old corrugated containers,OCC)纸浆胶黏物过程的影响因素和作用机理,同时比较了改性前后滑石粉对胶黏物作用效果的差异。结果表明:在一定的滑石粉用量的条件下,适当的纸浆温度和浓度可以促进改性滑石粉的作用效果,当改性滑石粉用量为1.5%,温度80℃,浆浓为20%(wt)时,胶黏物去除率可达到58%;阳离子型助剂能够使滑石粉表面带正电荷,增大滑石粉的比表面积,促进胶黏物吸附改性滑石粉,形成胶黏物―滑石粉微球,有利于胶黏物黏性降低和去除;由OCC手抄片的纸性检测发现:其作用后纸页的紧度、耐破指数、抗张指数和撕裂指数略有下降。     

研究与述评

正201602081钢材阳极防护用智能涂料及其性能研究[刊,英]/Silva,Rodrigo Sanchotene//Progress in Organic Coatings.-2015,78,116~123聚苯胺(PANI)涂层存在溶解性和机械性能等问题,为此,将PANI以氧化态和本征态分别与4-氯-3-甲基苯酚、增塑剂以及溶剂等组分混合,制得胶黏剂。该胶黏剂可以单独作为涂层使用,也可以结合传统的硝基纤维涂料复配成所谓的智能涂料。这种胶黏剂附着力强、     

丹参挥发油与蒲公英复配物在化妆品中的应用

分别测试丹参挥发油、蒲公英提取物及其复配物的抗氧化、美白、抑菌、细胞毒性和皮肤渗透性等作用，并考察丹参挥发油与蒲公英复配后是否具有协同增效作用。结果表明，复配物的抗氧化性能比二者单独作用效果更强，略高于阳性对照VC；丹参挥发油对酪氨酸酶活性的抑制作用强于阳性对照熊果苷，对酪氨酸酶的抑制类型为竞争性抑制，抑制常数KI为0.0049 mg/L，丹参挥发油与蒲公英两者之间对酪氨酸酶抑制无拮抗作用；复配物对金黄色葡萄球菌的抑制作用好于单一成分，与阳性对照硫酸链霉素效果相当；提取物为100 mg/L浓度时无明显细胞毒性；丹参挥发油与蒲公英复配后，蒲公英提取物的皮肤累计渗透量比单独作用时增大，丹参挥发油可促进蒲公英提取物的透皮吸收，复配物具有协同抗氧化和抑菌功效，无明显细胞毒性，皮肤渗透性较好。     

葛根淀粉基胶黏剂制备与性能研究

研究开发以淀粉为主要原料的环保型胶黏剂替代"三醛类"木材胶黏剂,对彻底解决人造板及其制品的甲醛释放问题具有重要意义。以野生葛根淀粉为原料,通过降黏处理,并与聚醋酸乙烯酯和异氰酸酯复配,制备出胶合强度达到国家Ⅱ类要求的淀粉基木材胶黏剂。研究了降黏剂用量、降黏时间、聚醋酸乙烯酯和异氰酸酯用量对淀粉基木材胶黏剂胶合强度的影响。优化工艺条件下制备胶黏剂胶接胶合板的胶合强度为1.89 MPa,能够满足国家Ⅱ类胶合板强度要求。     

FPC用改性丙烯酸酯胶黏剂的研制

采用苯并噁嗪和线型酚醛树脂与丙烯酸酯共聚乳液共混,制备了三种改性丙烯酸酯胶黏剂。对胶黏剂进行热分析确定了柔性覆铜板制作的固化工艺。讨论了两组份对改性胶黏剂及相应柔性覆铜板性能的影响。结果表明,两组份复合使用所得到的改性胶黏剂的粘接强度最大;苯并噁嗪的使用提高了基板的耐热性;单独使用苯并噁嗪的改性胶黏剂制成的基板能在350℃锡浴中10 s内不分层不起泡。     

提高环氧树脂黏钢胶机械性能的研究

研究目的在于提高建筑用环氧树脂黏钢胶的机械性能,以符合建筑行业使用的要求.通过采用自制酚醛胺为固化剂,并采用复配技术优化环氧树脂胶黏剂的组成,达到了调节胶黏剂刚性和韧性平衡的目的.考察了环氧树脂和填料的种类及用量对环氧树脂胶黏剂拉伸、弯曲和压缩强度的影响.当主树脂为E-51,添加100％比例为1:3的滑石粉与细砂复配填...     

Effect of micron sized silver particles concentration on the adhesion induced by sintering and antibacterial properties of hydroxyapatite microcomposites

In this paper, silver microparticles were proposed as an additive (wetting agent) in the sintering of bovine bone-derived hydroxyapatite, and their well-known antibacterial properties were evaluated for the newly-developed materials. Hydroxyapatite was prepared by thermal processing of bovine bones, followed by milling and sorting. After silver addition, the samples were tested as precursors, green compacts and adhered particles-sintered compacts, using complementary morphological, compositional and structural evaluation techniques (scanning electron microscopy coupled with energy dispersive spectrometry, Fourier infrared spectroscopy, X-ray diffraction). The antibacterial effect was assessed on bacterial strains popular for their association with post-implantation infections. The study was designed to evaluate the precursors, investigate the surface, morphology and/or structure changes during forming and adhesion by sintering, and explore the relationship between the silver concentration and the antibacterial effect of the material. The results confirmed the benefits of adding silver as a wetting agent in sintering bovine bone-derived hydroxyapatite as well as its antibacterial effect (with best results at 2 wt%Ag). In spite of the great potential as a wetting agent and antibacterial factor in hydroxyapatite, the proper evaluation of these results requires extensive testing for elevating the control level in designing the material properties, and for establishing optimal concentrations of silver in order to achieve proper antibacterial and biocompatible behaviours.     

Development of heat-resistant anticorrosion urethane siloxane paints

Three two-layer heat-resistant and anticorrosion paints have been formulated from urethane siloxane binder and traditional anticorrosion pigments such as micaceous iron oxide (MIO), zinc phosphate (ZP), and aluminum oxide. These pigments were used as the dominant components of different undercoats or topcoats. Heat-resistant pigments such as silicon nitride and glass-spheres were used in the composition of the topcoats. Thermogravimetric analysis of paints shows that the paint with ZP as dominant component of the undercoat have the highest heat-resistance and stability in inert gas and oxygen. The paint with a combination of MIO and ZP has the best hardness as well as the best protective and anticorrosion properties based on the electrochemical impedance spectroscopy. A maximum synergic effect of the properties of pigments seems to appear in this paint. Surface morphology of paints was studied by means of scanning electron microscopy. Heated at different temperatures and for several hours, paint containing MIO as the dominant component in the undercoat exhibits the best mechanical and adhesion properties.     

煤基载银抗菌剂的研制

研究了以煤为载体、用液相交换吸附法制备煤基载银抗菌剂的实验工艺,探讨了处理温度、处理时间、处理剂浓度等因素对抗菌性离子含量的影响,并找出最佳反应条件为:温度50℃～60℃,时间1h,硝酸银溶液质量浓度0.2mol/L～0.5mol/L。测试了煤基载银抗菌剂的耐洗涤性,同时使用能量色散谱对煤中各元素做了定量、定性分析,探讨了抗菌剂的主要性能和特点,预测了其适用范围。     

Effect of various post materials and resin luting cements on microleakage in endodontically treated root canals

The effect of various post materials luted with different resin luting cements on microleakage in root canals was studied in the present study. Sixty carious and crack-free premolars were prepared using a step-back technique and obturated with gutta-percha. The roots were randomly divided into six groups (n = 10). Two different post types, glass fiber reinforced posts and zirconium posts (ZP), were cemented three different resin adhesive cements (Panavia F 2.0, Smartcem 2, and Variolink II) in the root canals. All specimens were thermal cycled and stored in the methylene blue solution for one week. The roots were sectioned horizontally into three sections: apical, middle, and coronal. The occlusal direction of each section was digitally photographed under a stereomicroscope. Dye penetration area was calculated as the methylene blue-infiltrated surface divided by total dentin area. After the two-way Anova test results, Tukey HSD and Bonferroni tests were used for multiple comparisons. According to the test results, ZP luted with Panavia F showed the best microleakage results and glass fiber posts luted with smartcem 2 showed the most unsuccessful microleakage results (p = 0.146).     

细木工板结构对甲醛释放规律的影响及其控制

采用HJC-1型环境测试舱模拟室内环境,测量细木工板中甲醛的释放浓度,考察了细木工板结构对甲醛释放的影响,用活性炭、甲醛封闭剂、光触媒和空气触媒控制细木工板中甲醛的释放. 结果表明,细木工板中甲醛释放通道主要为端面,且板材内部结构疏松时甲醛释放剧烈;甲醛封闭剂和活性炭吸附控制细木工板中甲醛浓度的效果理想,平均效率分别为56.05%和52.83%,甲醛浓度在短时间内降到低于Ⅱ类和Ⅰ类民用建筑工程标准.     

载银锌纳米二氧化硅抗菌剂的制备及应用

利用纳米二氧化硅的结构特性,将其作为抗菌剂载体,制成了一种载银锌双组分纳米二氧化硅抗菌剂,研究了提高抗菌剂分散性的方法。结果表明,使用振动磨加分散剂的方法进行分散,可以提高载银锌纳米二氧化硅抗菌剂在涤纶基体中的分散性;该抗菌剂对大肠杆菌及金黄色葡萄球菌的抗菌率达96％以上,且抗菌涤纶具有良好的力学性能。     

稀土β-成核剂改性无规共聚聚丙烯抗菌塑料的性能表征

讨论了无机金属离子/纳米二氧化钛抗菌剂和有机季铵盐抗菌剂对加入WBGⅡ的无规共聚聚丙烯(PPR)复合材料抗菌性能、力学性能和结晶性能的影响。结果表明:抗菌剂的加入明显地提高了PPR的抗菌能力,且无机抗菌剂的作用效果要优于所选取的有机季铵盐抗菌剂,但其对于基体力学性能的影响也较大。无机抗菌剂用量在6～10份时,对大肠杆菌、金黄色葡萄球菌的抗菌率分别达到93.8%～99.2%、91.7%～98.2%;有机季铵盐抗菌剂用量在2.5份时,对大肠杆菌、金黄色葡萄球菌的抗菌率分别达到91.0%、91.4%。     

废纸回用过程中胶粘杂质的分类及化学控制

随着废纸回收利用率的提高 ,胶粘杂质的控制问题得到了人们广泛的关注。本文简述了胶粘杂质的来源、分类及化学控制方法。     

离子交换法合成非晶态铝硅酸盐抗菌材料研究

合成了以非晶态铝硅酸盐为基体,银离子作为主要抗菌成分的无机抗菌剂粉体。通过改变离子交换反应中溶液的抗菌离子浓度、反应时间等因素,探讨了用离子交换法制备载银非晶态铝硅酸盐抗菌粉体的最佳工艺和条件。利用电子显微镜扫描技术、X射线衍射技术和抗菌性能测试,对非晶态铝硅酸盐及其抗菌材料的结构与性能进行表征与考察。研究表明：非晶态铝硅酸盐粒径较小,粒径分布范围窄,具有良好的离子交换和吸附性能。恒温下载银的离子交换反应,必须严格控制pH值,应注意银离子浓度不宜大于0．3mol／L。同时载入锌离子或铜离子,并不与银离子明显地互相干扰,相反有利于稳定无机抗菌剂中银离子的存在。所合成的抗菌材料样品,对大肠杆菌、金黄色葡萄球菌、枯草芽胞杆菌和绿脓杆菌等,均表现出良好的抗菌、抑菌性能。     

藏药红景天多糖基抗菌可食膜的制备

以藏药红景天(RP)作为研究对象,以乙醇/硫酸铵双水相体系(EAS)作为活性提取试剂,以提取的红景天多糖作为天然绿色抑菌活性因子,以甘油(Gly)为增塑剂、明胶(Gel)为成膜剂、氯化钙为交联剂,采用斜面自然倾倒流延法,制备了一种新型的抗菌膜材料。以抗菌膜的抗拉强度、抑菌活性、水蒸气透过率,包肉降解特性作为膜材料的评价指标,考察了成膜材质的最佳添加量。抑菌实验结果表明,当红景天多糖加入量为6m L(WRP=14.6%)时,抗菌膜材料对金黄色葡萄球菌和大肠杆菌的最大抑制率分别为97.3%和88.6%。抗拉强度、水蒸气透过率以及包肉降解特性实验结果表明:当添加多糖6 mL、甘油1.5 g、明胶1.0 g、氯化钙0.8 g时制备的抗菌膜性能最好。