共查询到20条相似文献,搜索用时 46 毫秒
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L-乳酸薄荷酯的合成及其在个人护理用品中的应用研究 总被引:1,自引:0,他引:1
以发酵乳酸和天然薄荷醇为主要原料用直接酯化法合成了乳酸薄荷酯,讨论了合成过程中带水剂的选择、投料配比、反应温度和反应时间对反应转化率的影响.实验结果表明,以四氯化碳为带水剂,m(乳酸):m(薄荷醇)=1.2:1,110℃反应3 h,薄荷醇对乳酸薄荷酯反应转化率可达75.5%.产品经减压蒸馏、重结晶处理后质量分数达99.6%.将其作为清凉剂应用于沐浴露、护肤乳液、爽身粉等个人护理化学品的配方中,并与传统清凉剂薄荷脑进行了性能对比研究.结果表明此产品应用于个人护理用品中,在人皮肤上的清凉作用和感觉方面与薄荷脑相比较更为温和而持久. 相似文献
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针对高磷铁水脱磷过程,运用FactSage软件对CaO系、Na2CO3系和CaO-Na2CO3系渣的脱磷能力进行了热力学模拟计算.综合分析计算结果得出,对于成分为ω[Fe]=95.08%,ω[c]=3.5%,ω[p]=1.3%,ω[si]=0.1%,ω[s]=0.02%的高磷铁水,将磷含量降到0.1%以下适宜的渣系组成为,ω(CaO)=37.5%,ω(siO2)=9.4%,ω(Fe2O3)=43.3%,ω(Na2CO3)=3.8%,ω(CaF2)=6%,渣铁比为0.2,温度为1623 K. 原始磷含量1.3%的铁水脱磷实验结果表明,用模拟计算得出的渣系,在温度1623 K,渣铁比0.2的条件下,可将铁水磷含量降到0.1%以下.热力学模拟计算对高磷铁水脱磷剂组成的确定及渣铁比、温度的选择具有一定的指导作用. 相似文献
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采用反相乳液聚合方法,以丙烯酸、甲基丙烯酸、十六醇为主要原料,合成出聚丙烯酸酯涂料印花增稠剂,并对合成工艺进行了研究,以及对产品性能进行了测试.结果表明,通过控制ω(丙烯酸)=55%,ω(甲基丙烯酸十六酯)=45%,ω(交联剂)=0.3‰、ω(引发剂)=0.4‰,可得到性能优良的增稠剂,其质量完全达到进口增稠剂PTF的水平,但成本价格不到PTF的一半. 相似文献
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《橡塑技术与装备》2017,(24)
本文以壳聚糖(CTS)﹑马来酸酐(MA)以及2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为高吸水性树脂的合成原料,并以过硫酸铵(APS)为作为合成反应引发剂,以N,N’-亚甲基双丙烯酰胺(NMBA)为合成反应的交联剂,采用紫外光固化法合成交联型CTS-g-AMPS-MA高吸水树脂。同时,研究了各组分种类及用量对交联型CTS-g-AMPS-MA树脂吸水性能的影响。实验研究结果表明:当固含量为15.87%,n(AMPS):n(MA)=14:1,ω(CTS)=2%,ω(NMBA)=2.5%,ω(APS)=0.3%,p H=3,固化时间为5 min时可得到具有较好吸水性的交联型高吸水树脂,其在蒸馏水中的最大吸水率达到555 g/g。采用FT-IR和TGA对交联型高吸水树脂结构和热稳定性进行了表征,并对交联型高吸水树脂吸水速率及动力学进行了分析。通过反吸液能力实验测定,交联型CTS-g-AMPS-MA高吸水树脂具有一定的降解能力。 相似文献
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以聚乙二醇20000(PEG20000)为分散稳定剂,过硫酸铵/亚硫酸氢钠(APS/SB)为引发体系,将丙烯酰胺(AM)和甲基丙烯酰氧乙基三甲基氯化铵(DMC)进行水分散聚合,得到了水包水型阳离子聚丙烯酰胺乳液。考察了影响聚合物稳定性的参数,用红外光谱仪对产品进行了表征。实验结果表明:40℃,ω(PEG20000)=60%~80%,ω(APS/SB)=0.2%~0.4%,ω(AM+DMC)=15%~20%,ω(DMC)=15%~20%时,产品稳定性和流动性都较好。 相似文献
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为研究超声波法制备薄荷油β环状糊精包合物的最佳工艺,采用正交试验研究原料配比和包合时间两个因素对薄荷油β-环状糊精包合物的超声波法制备工艺的影响,考察包合物的收率。得到最佳工艺条件为:β-环状糊精与薄衙油的用量比为6.0:2.0,包合时间为5min/次,共1.5h。此方法可用于制备薄荷油β-环状糊精包合物。 相似文献
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《合成纤维》2017,(2):8-12
以密胺树脂为壁材、薄荷油为芯材制备薄荷油微胶囊并与聚丙烯(PP)进行熔融共混纺丝得到了芳香纤维。通过设计正交试验,获得微胶囊的最佳制备工艺条件为:芯壁质量比2∶3、壁材质量分数8%、乳化剂质量分数0.8%、缩聚时间2 h;所得的微胶囊平均粒径小(4.568μm)、热稳定性好、形貌规整且产率高(63.17%)。以PP为基体制备微胶囊质量分数20%的母粒,再与PP进行共混熔融纺丝,结果表明:当共混物中微胶囊的实际添加质量分数为2.5%时,共混物可纺性好,纤维的强度可达3.4 c N/dtex。在纺丝前后微胶囊的含油率变化不大,纤维中的含油量为14.05 mg/g。 相似文献
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密封条件下超声法制备薄荷油β-环糊精包合物研究 总被引:1,自引:0,他引:1
研究超声法制备薄荷油β-环糊精包合物的最佳工艺,采用L9(34)正交实验设计,以综合评分为总评价指标,优选其制备工艺。最佳工艺条件:温度为60℃,挥发油/β-CD(mL:g)配比为1:5,超声时间为45min。本法优选工艺条件下挥发油包合物收率和包合率均较高,稳定性强,生产效率高,实用性强,具有可行性,为薄荷油的进一步利用奠定基础。 相似文献
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Bhupesh C. Roy Motonobu Goto Akio Kodama Tsutomu Hirose 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1996,67(1):21-26
Essential oils and cuticular waxes were extracted from peppermint leaves with supercritical carbon dioxide in a semicontinuous-flow extractor. The effects of CO2 flow rate and pressure on the extraction rate were studied within the flow rate range of (4·1–9·8) × 10−5 kg s−1 and the pressure range of 10–30 MPa. Flow rate effect indicated that the intraparticle diffusion resistance was not dominant in this process. The extraction rate of cuticular waxes increased remarkably with the pressure, whereas that of essential oils was almost constant as compared with cuticular waxes. The concentration of cuticular waxes at the exit of the extractor was close to the solubility of triacontane while that of essential oils was much lower than the solubility of 1-menthol. 相似文献
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以明胶、阿拉伯胶为壁材,通过复合凝聚法可制备易于过滤的球状多核微胶囊。最佳的制囊工艺条件为:壁材浓度为1%,芯材:壁材(质量比)=2:1,明胶:阿拉伯胶(质量比)=1:1,pH值为4.0,甲醛:明胶(质量比)=1:1。 相似文献
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为了优化折板絮凝器结构及提升折板絮凝器对中药液的絮凝效果,利用FLUENT软件对同波/对波折板絮凝器的内部流场进行了模拟,分析了两种折板絮凝器内的涡旋分布及涡量.以薄荷水提液为研究对象,壳聚糖为絮凝剂,采用不同折板絮凝器对薄荷水提液进行絮凝处理,以薄荷水提液澄清层高度、絮体沉降速度、总黄酮保留率、絮凝率、药液吸光度及絮... 相似文献
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Marcin Masowski Andrii Aleksieiev Justyna Miedzianowska Krzysztof Strzelec 《International journal of molecular sciences》2021,22(14)
In this study, peppermint (Mentha piperita L.), German chamomile (Matricaria chamomilla L.) and yarrow (Achillea millefolium L.) were applied as natural fibrous fillers to create biocomposites containing substances of plant origin. The purpose of the work was to investigate the activity and effectiveness of selected plants as a material for the modification of natural rubber composites. This research was the first approach to examine the usefulness of peppermint, German chamomile and yarrow in the field of polymer technology. Dried and ground plant particles were subjected to Fourier transmission infrared spectroscopy (FTIR) and UV–Vis spectroscopy, thermogravimetric analysis (TGA), goniometric measurements (contact angle) and scanning electron microscopy (SEM). The characterization of natural rubber composites filled with bio-additives was performed including rheometric measurements, FTIR, TGA, cross-linking density, mechanical properties and colour change after simulated aging processes. Composites filled with natural fillers showed improved barrier properties and mechanical strength. Moreover, an increase in the cross-linking density of the materials before and after the simulated aging processes, compared to the reference sample, was observed. 相似文献
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The apolar and hydrophobic jojoba molecule was made more hydrophilic by the incorporation of primary amino groupsvia the introduction and subsequent reduction of azido groups. The azides were obtained by the substitution of bromine or a mesylate
group introduced into the jojoba oil molecule; by opening of the epoxide ring in epoxy jojoba; or by the addition of bromoazide
to the double bonds of jojoba. 相似文献