汉麻粉中防晒成分的提取条件研究

采用乙醇提取法提取汉麻粉中的防晒成分,通过溶液法和3M胶带法测定其上层清液和下层沉淀的吸光度,以吸光度为指标优化提取工艺。首先在室温条件下进行初步探索,然后考察提取温度、提取时间和汉麻粉混悬液的质量分数对吸光度的影响。实验结果表明,乙醇提取法可以提取出汉麻粉中的防晒成分(主要吸收波长在200~350 nm之间);乙醇提取汉麻粉中防晒成分的较佳条件为:提取温度55℃,提取时间1 h,汉麻粉质量分数15%。     

防晒化妆品防晒效果评价方法——紫外吸光度法的研究

评价防晒化妆品防晒效果的紫外吸光度法是使用紫外分光光度计测定产品的吸光度值Ａ,根据Ａ值的大小,评价产品的性能,并可与防晒因子（ＳＰＦ）值对照,选择了实验条件,对比了几种不同的制样方法,划分了评价防晒效果高低的等级,测定了部分国内外防晒化妆品。     

O/W型防晒化妆品SPF值与吸光度的相关性初探

目前防晒化妆品防晒性能评价主要采用人体测试和仪器测试,人体测试所需周期太长,处理成本太高,仪器测试所需仪器昂贵,制样繁琐而且重现性差。采用样品稀释紫外分光光度法测试O/W型防晒化妆品的吸光度,与仪器法所测SPF值具有良好的相关性,既降低了测试成本,又达到了测试效果。     

介质对VC紫外吸收光谱特性影响及应用

本文研究VC在不同介质环境中紫外吸收光谱特性。比较VC在水、常见的3种酸的最大吸收波长的变化和吸光度的稳定性,对引起最大吸收波长迁移和吸光度改变的机理进行了探讨。建立了紫外吸收分光光度法测定VC的最优环境,并用于VC泡腾片、苹果和柠檬中的VC含量的测定。该方法快速准确,稳定性好,灵敏度高。     

生物防晒剂活酵母细胞衍生物制备中酶解条件的优化

研究了紫外照射培养后蛋白酶添加量、酶解温度、酶解时间及pH等酵母菌酶解条件对酵母水解液的紫外吸收性能的影响,并将活酵母细胞衍生物应用于防晒护肤品中。实验结果表明,活酵母细胞衍生物的优化制备条件为:质量分数10%酵母菌液中添加2%的蛋白酶,1%的纤维素酶,pH=6,52℃酶解26 h。所制得的活酵母细胞衍生物作为防晒护肤品添加剂,使其SPF值最大可提高128.2%。     

金银花中绿原酸防晒作用研究

考察了金银花中绿原酸的紫外吸收性能、光照稳定性、酸碱稳定性及其防晒产品的防晒性能。结果显示,金银花提取物在280~350 nm内具有良好的紫外吸收性能。绿原酸具有光化学活性,发生光降解反应,提取物溶液中绿原酸的保留率随光照时间的延长而降低,光照8 h提取物溶液中绿原酸的保留率为85.6%。在pH=3~7时绿原酸相对稳定。金银花防晒霜体外评价SPF值与金银花提取物中绿原酸含量有关,防晒霜中绿原酸质量分数达2.15%时SPF值为15。     

汉麻织物活性染料浸染染色工艺研究

探讨了汉麻在浸染中的提升性能以及盐、碱、固色时间、固色温度、浴比等工艺条件对得色的影响,通过吸固曲线得到了染料在汉麻上的S、E、R、F值。结果表明,活性染料在汉麻上染色效果较好,各项牢度也较好。     

黄瓜化妆品功效的初步研究

本文对用黄瓜配制化妆品的功效进行了研究。用Metic Digi Mic800检测黄瓜面膜对皮肤纹理的改善效果;把黄瓜汁配制成的保湿霜和美白霜,用CORNEOMETER CM825检测其保湿功效,用吸光度值及SPF值仪器测定法检测其防晒功效。结果发现,黄瓜配成的面膜可有效改善皮肤纹理;黄瓜配成保湿霜和美白霜具有明显的保湿效果,但防晒效果并不明显。     

酸对原子吸收测定钙的影响

讨论了用原子吸收分光光度法测定玻璃中钙含量时,几种不同的酸及其酸度对测定吸光度值的影响.     

两种灭菌方式对医用级聚丙烯结构与性能的影响

将三种不同聚丙烯(PP-1、PP-2、PP-3)的注塑样条分别进行湿热灭菌和辐照灭菌处理,与未经灭菌的聚丙烯进行性能对比,了解灭菌处理后产品是否符合医用标准的要求,并探究产生差异的原因。结果表明:PP-1和PP-2中存在α晶型和γ晶型,PP-3只存在α晶型,两种灭菌方式均不会改变三种PP的晶型,经灭菌处理后PP的结晶度增大,拉伸强度、弯曲强度与弯曲模量增大,但冲击强度下降,PP-1和PP-2的力学性能可达到医用标准;紫外吸光度值可以评定材料中产生水溶性有机物的含量,通过测试紫外吸光度值发现,辐照灭菌后只有PP-1不符合医用安全标准。     

Optimization of variables in grinding brass particles for paint and pigment industry

Flaky metal powders commonly used as paint and pigments, are generally produced by grinding in ball mills or vibration mills. The key to good quality powder production is to optimize the processing parameters. In the present work grinding of brass particles is studied in detail in a laboratory size ball mill to determine the optimal levels of the ball to material ratio, type and amount of additives, mill speed, ball load, etc. The quality of the powder is assessed on the basis of water coverage, degree of flattening and luster by visual inspection. Preliminary results in a 35 cm diameter ball mill with 30% ball load show that a material to ball ratio of 0.067 with a 0.1% dosage of stearic acid is required for good quality powder. For determining optimal mill speed and ball size a 2² factorial design of experiment has been followed. It has been determined that to achieve best powder quality the mill must run at 70% critical speed and the ball size must not exceed 20 mm. The quality of the powder assessed through SEM study for surface morphology and particle size analysis compares very well with the industrial samples.     

蛋白污布的染制均匀性对洗涤剂去污力评价的影响

采用球磨机代替手工磨制炭黑制备改进蛋白污布(改进JB-02),通过测试标准洗衣粉、市售洗衣粉和含蛋白酶的标准洗衣粉对改进JB-02的去污值来评价所制备污布的质量。结果表明,使用球磨机磨制相比于手工磨制的炭黑颗粒的粒径变小,粒度分布变窄,分散均匀性提高;改进JB-02的染制均一度提高;标准洗衣粉对改进JB-02的去污值提高;当标准洗衣粉中蛋白酶的质量分数低于0.15%时,改进JB-02对蛋白酶的敏感度提高;改进JB-02的稳定性较好,可考虑作为标准产品使用。     

基于多重乳化体技术制备中草药防晒霜

采用乙醇提取罗勒等7种中草药,将制备的各单一中草药提取液等质量混合,制得中草药提取液组合物。通过紫外分光光度法对其紫外线吸收率进行测定,结果表明其具有较佳紫外线吸收效果。分别采用4种脱色剂活性炭、高锰酸钾、过氧化氢和草酸对其进行脱色研究,结果表明,经草酸脱色后的中草药提取液组合物颜色较浅,且仍保持较好的紫外线吸收效果。基于多重乳化体技术,将制备的中草药提取液组合物添加于W/O/W型多重乳化体的最内相中,制备得到中草药防晒霜,并与单重乳化体中草药防晒霜进行比较。测试评价结果表明,多重乳化体中草药防晒霜具有较好的温和性和稳定性,当中草药提取液组合物添加量为15.0%时,SPF和PFA值分别为20.3和5.3。     

立磨对水泥配合料的适应性探讨

通过研究不同组成的立磨终粉磨水泥试样的颗粒特性,并与相同组成的球磨机终粉磨水泥试样的颗粒特性进行比较,探讨了以立磨为终粉磨装置对不同入磨物料的适应性问题。试验研究结果发现,以立磨对水泥进行终粉磨时,其对入磨物料变化的适应性明显不如球磨机终粉磨系统。然而当物料的易磨性越好时,立磨终粉磨水泥的颗粒特性表现就会越好,此时与球磨终粉磨水泥颗粒特性的差距也会明显变小。     

半终粉磨钢渣微粉生产线的设计和实践

钢渣微粉化是解决钢渣终端利用的有效途径,但采用传统粉磨工艺无法有效解决钢渣微粉生产中的除铁难题,同时也无法保证钢渣微粉产品的稳定细度和活性。采用带辊压机半终粉磨的圈流高细磨钢渣微粉粉磨工艺,可以充分发挥和利用辊压机的挤压优势和球磨机的研磨功能,达到显著改善产品性能、增产节能,又能高效除铁的效果,是当前钢渣固废利用的可靠有效方案。经优化比较和生产实践,建议在新建或改造钢渣微粉生产线时,以控制辊压机与球磨机的装机功率比在0.6~0.7,球磨机的长径比控制在3.5~4.0为宜。     

球磨法制备超细稻壳二氧化硅

将稻壳用10％(体积分数)的盐酸处理后在600℃焚烧得到稻壳二氧化硅,再利用球磨法进行研磨,得到平均粒径为5.01 μm、分散度为1.31的超细稻壳二氧化硅粉体.研究了研磨时间、球料比和磨球直径对粉体粒径的影响,并对研磨前后粉体的性质、红外光谱(FTIR)及X-衍射图谱(XRD)进行了比较.结果表明:合适的球料比、磨球...     

Kinetics of dry grinding of quartz glass (fused quartz)

Conclusions We studied the kinetics of dry grinding of quartz glass in a ball mill. We determined the dispersion of the powders at different stages of grinding and showed that it is markedly retarded with the attainment of a specific surface in the powder of about 14,000 cm²/g.The dispersion and degree of polydispersion of the powder for different grinding times are characterized.We note the essential change in the coefficient of bulk loading of the mill during grinding as a result of the reduction of the bulk density of the material with an increase in its dispersion.We determined the optimum grinding time for obtaining powder suitable for forming semifinished products with different methods.Translated from Ogneupory, No. 8, pp. 54–57, August, 1970.     

钢渣微粉加工工艺探讨

采用不同的半工业化粉磨试验系统对块状钢渣和水淬钢渣进行粉磨试验,并对不同的粉磨工艺进行了分析比较,从而确定由辊压机加球磨组成的联合粉磨系统是目前较为理想的钢渣微粉生产工艺。     

The influence of grinding technique on the liberation of clinker minerals and cement properties

This paper describes a study of the relationship between the physical, chemical and mineralogical parameters of cement products obtained by different grinding mechanisms namely high pressure grinding rolls (HPGR) and ball milling, and their effects upon the properties of cements prepared from the ground clinker. Samples were prepared as narrow size fractions and also as distribution samples. Characterization parameters were ascertained by using XRF, laser sizing, Blaine and BET surface area and image analysis methods. HPGR grinding resulted in higher degrees of liberation of clinker phases arising from the intergranular breakage along the grain boundaries compared to ball mill grinding. As for service properties, water demand of HPGR products was higher than ball mill products resulting from high micro fissured structure. Despite high liberation of particularly alite mineral in HPGR grinding, the compressive strength of ball mill products was slightly higher than HPGR products for narrow size samples. Finally, particle size distribution effect on strength was more obvious for distribution samples; generally ball milling gave higher strength values.     

The effect of grinding process on mechanical properties and alkali–silica reaction resistance of fly ash incorporated cement mortars

The effect of fineness of fly ash on mechanical properties and alkali–silica reaction resistance of cement mortar mixtures incorporating fly ash has been investigated within the scope of this study. Blaine fineness of fly ash has been increased to 907 m²/kg from its original 290 m²/kg value by a ball mill. Test samples were prepared by replacing cement 20, 40 and 60%, with finer and coarser fly ashes and kept under standard and steam curing conditions until testing. Test results showed that grinding process improved the mechanical properties of all samples significantly. The beneficial effect of grinding fly ash, may increase utilization of this by-product in precast and ready-mix concrete industries. Incorporation of fly ash with different fineness values and ratios also decreased the expansions to harmless levels of cement mortars due to alkali–silica reaction.