以聚乙二醇二丙烯酸酯为壁材的防晒微胶囊的制备及性能表征

采用自由基界面聚合法,以聚乙二醇二丙烯酸酯(PEGDA 200)为壁材单体,过氧化二苯甲酰(BPO)为引发剂,紫外线吸收剂胡莫柳酯(HMS)为芯材,制备具有防晒功能的微胶囊。通过扫描电镜、激光粒度分析仪和傅里叶红外光谱分别对微胶囊的形貌、粒径分布和化学组成等进行表征。结果表明,在优化的反应条件下,制备的微胶囊为光滑的球形,包覆率达96.8%,平均粒径11.7μm。通过UV-2000S紫外线透过率分析仪测试其SPF值,证明微胶囊化的胡莫柳酯的防晒效果有明显提高。     

二氧化硅包覆硫黄微胶囊的制备

以正硅酸四乙酯(TEOS)为硅源,采用溶胶凝胶法制备二氧化硅包覆硫黄微胶囊,研究其制备条件,并对包覆机理进行分析。通过扫描电镜分析微胶囊的表面形貌,确定微胶囊的最佳制备条件为:硫黄/TEOS摩尔比2/1~3/2,氨水用量2.5~3 m L,醇/水质量比85/15~80/20,所制得的硫黄微胶囊形貌规整,包覆完整。     

紫外线吸收剂奥克立林的合成新工艺研究

在对甲苯磺酸催化下,氰基乙酸与异辛醇进行酯化反应;酯化液在-10℃冷却过滤,滤液中再加入二苯甲酮和催化剂乙酸铵,发生Knoevenagel缩合反应;后处理得到深色产物,经硅胶层过滤脱色后制得浅黄色的奥克立林纯品,总收率达86%(以实际消耗的异辛醇计),纯度为99%.     

防晒化妆品用紫外线吸收剂BP-3的研究进展

综述了防晒化妆品用紫外线吸收剂BP-3的研究进展,介绍了使用防晒化妆品的必要性。概括了BP-3的命名、理化性质、在化妆品中的最大使用量和它的毒理学性质。简述了BP-3的合成方法及进展,并且对BP-3的国内外市场情况及发展趋势作了分析。     

Pickering乳液聚合法制备复合防晒微球体

设计了一种表面负载物理防晒剂TiO2、内部包埋化学防晒剂阿伏苯宗(AVB)的PMMA微球体(TiO2@PMMA-AVB),并以TiO2纳米粒子为Pickering乳化剂,利用Pickering乳液聚合法,在无表面活性剂的条件下一步法制备了TiO2@PMMA-AVB复合防晒微球体.紫外光透过率、光稳定性、体外透皮以及感官...     

表面包覆微胶囊硫黄的制备及其应用研究

采用包覆剂通过溶胶-凝胶法对普通硫黄进行包覆,制备出表面包覆微胶囊硫黄产品,并对其性能进行研究.试验结果表明,影响包覆率的主要因素有包覆剂品种、包覆温度、搅拌时间、包覆剂用量及溶剂用量;包覆硫黄产品的粒径比普通硫黄有所增大,具有较好的高温热稳定性,且可抑制喷霜现象;与普通硫黄和不溶性硫黄硫化胶相比,包覆硫黄硫化胶的物理性能相当或较优,符合橡胶制品的性能要求.     

二氧化硅包覆硫磺微胶囊的制备工艺探讨

以正硅酸四乙酯为硅源,在硫磺溶胶的表面通过溶胶凝胶法制备了二氧化硅包覆硫磺微胶囊,分别从核壳材料比,醇水比以及催化剂浓度等几方面对合成反应条件进行了探究,通过扫描电镜对微胶囊形貌对比后确定了微胶囊的最佳制备条件,认为在醇水比为80/20,氨水用量为2.5~3ml条件下选用一定量的TEOS可以得到形貌规整,包覆完整的硫磺微胶囊,并对包覆机理进行了研究。     

脲醛树脂微胶囊包覆红磷阻燃剂制备工艺的研究——Ⅱ．包覆工艺研究

研究了脲醛树脂的预聚物通过原位聚合对红磷进行包覆的一些影响因素。实验表明,影响包覆条件的主要因素是预聚物与水的质量比、包覆温度、pH值和包覆时间。通过正交实验得到了进行微胶囊包覆的最佳条件为：红磷与水的质量比为1∶30,反应温度为75℃,pH值为3．5,反应时间为2h。颜色为白色,吸湿量为4．01％,用微胶囊红磷去阻燃聚氯乙烯,当含量为9．0％时,在500℃下残余物为14．45％。     

聚苯乙烯接枝包覆硫黄微胶囊的制备与表征

以合成硫黄为芯材、聚苯乙烯(PS)为壳材,采用原位接枝改性聚合方法制备PS接枝包覆硫黄微胶囊,分析不同苯乙烯/硫黄颗粒配比对硫黄微胶囊形貌的影响,表征接枝状况和热稳定性。结果表明,当硫黄颗粒用量不变、苯乙烯用量为1.5 mL时,硫黄微胶囊的表面形貌规整,分散性较好,热稳定性提高。     

脲醛树脂包覆环氧树脂微胶囊的制备及性能研究

制备了脲醛树脂包覆环氧树脂(EP-UF)微胶囊,探讨了芯材与壁材的质量比、工艺条件对微胶囊的性能影响,以及微胶囊对EP基体的修复过程与修复能力。结果表明,当脲甲醛预聚体的合成温度为70℃、EP和苯甲醇的质量比为10:3、芯材与壁材的质量比为0.8、乳化剂用量为5%-7%、分散搅拌速度为500r/min、pH=3时,所制得的EP-UF微胶囊的平均粒径约为55μm,囊壁的密闭性好、强度高,芯材的包覆率高、流动性好,微胶囊填充EP基体材料的拉伸强度、修复率较高。     

微胶囊固定化P507萃取Sm3+的性能研究与优化

为解决传统溶剂萃取回收稀土中两相分离困难、溶剂流失和设备庞大的问题,利用溶剂萃取法结合同轴环管微通道装置制备聚砜微胶囊,研究了微胶囊固定化P507 对Sm³⁺的萃取性能及其优化。系统地考察了微胶囊固定化P507 对Sm³⁺ (300 mg·L^-1) 的萃取动力学、反萃性能和循环萃取反萃稳定性,揭示了微胶囊萃取体系的优点,操作简单、萃取剂流失较小、稳定性高。为强化传质过程,提高萃取、反萃动力学,用煤油稀释负载的P507,考察P507-煤油溶液中P507 体积分数对萃取效果的影响。P507-煤油溶液中的P507 体积分数为40%时,在液液体系中对Sm³⁺的萃取效果最好。将其用于微胶囊体系中,和稀释前相比,萃取平衡时间由120 min 缩短到40 min,萃取容量从由45.09 mg·(g P507)^-1 增大到69 mg·(g P507)^-1,P507 利用率由55%提高到84%,反萃完成时间由600 min 减小到120 min。用煤油稀释负载的P507 能有效提高萃取速率、平衡萃取量和反萃速率。20 次萃取反萃循环表明P507 稀释后微胶囊仍然具有较好的稳定性。     

Preparation and characterization of microcapsules containing capsaicin

With urea‐formaldehyde (UF) resin as walls and capsaicin as core substances, microcapsules were prepared based on in situ polymerization process. The morphology and size distribution of the microcapsules were analyzed by Fourier transform infrared spectroscopy, laser particle size analyzer, and scanning electron microscopy. The microcapsulated capsaicin (MC) agents had a mean diameter of about 30–50 μm. Moreover, the thermal properties of the MC agents were measured by differential scanning calorimetry and thermogravimetric analysis. It was demonstrated that the melting point and thermal stability of the MC agents were greatly improved compared with that of the uncovered capsaicin, which were caused by the encapsulating crosslinked UF resin over the surface. The shell formation mechanism and the effects of the process conditions such as U/F ratio, shearing force, and acidification time on the particle size of the MC agents were discussed. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

聚苯乙烯接枝包覆硫磺微胶囊的制备与表征

以合成硫磺为芯材,聚苯乙烯为壳材,采用原位接枝改性聚合方法制备了聚苯乙烯接枝包覆硫磺微胶囊,研究了不同苯乙烯/硫磺颗粒配比对微胶囊形貌的影响,制备了粒径均一分布的硫磺微胶囊,且分散均匀。结果表明苯乙烯的含量对微胶囊的表面形貌有很大影响,经包覆之后硫磺微胶囊的热稳定性提高。     

Innovative and high performance synthesis of microcapsules containing methyl anthranilate by microsuspension iodine transfer polymerization

In this research, preparations of polymer microcapsule encapsulated methyl anthranilate (MA) as an essential oil model by both microsuspension conventional radical polymerization (ms CRP) and microsuspension iodine transfer polymerization (ms ITP) using methyl methacrylate (MMA) and ethylene glycol dimethacrylate (EGDMA) copolymer as the polymer shell were studied. In the case of ms CRP, a large amount of free polymer particles nucleated in aqueous medium were obtained. Using ms ITP, the free polymer particle formation was significantly depressed. Iodoform (CHI₃) as a chain transfer agent with 0.8 wt% relative to the monomer, such a phenomenon was not observed. Various emulsifiers (oleic acid, Span 80 and PEG 30 dipolyhydroxystearate (DPHS)) with low hydrophile–lipophile balance value were used to retain MA in the monomer droplets or polymerizing particles. DPHS is the most effective emulsifier to retain MA in microcapsules giving 58% encapsulation at 20 wt% of DPHS relative to MA. In addition, from the controlled release study, only 55 wt% of the encapsulated MA was released by 90 days. Polymer microcapsule encapsulated MA using an MMA‐EGDMA copolymer shell with a high percentage of encapsulation and without free polymer particles was successfully prepared for the first time. Based on slow release of the encapsulated MA, the prepared microcapsules could be used in various applications. © 2017 Society of Chemical Industry     

工业废渣—铬渣制取矿棉

用铬渣作主要原料,配以辅助原料,可以制成矿棉.其性能与用途跟普通矿棉一样,最高使用温度和化学稳定性高于普通矿棉.铬渣制造矿棉是控制铬污染的有效的途径,而且能将有害的废渣转化为有利用价值的工业产品.     

微胶囊的制备技术及其应用

综述了微胶囊的制备技术及其应用,介绍了微胶囊技术在国内的研究进展。     

Optimal preparation and characterization of poly(urea–formaldehyde) microcapsules

Microcapsules with epoxy curing agent were successfully prepared by an in‐situ polymerization route with epoxy resin and poly‐(urea–formaldehyde) as core and shell materials, respectively. The synthetic conditions were optimized by a comprehensive investigation on raw materials consumption, size distribution, and surface morphology. Preparation of microcapsules with high wrap ratio was also demonstrated. The as‐synthesized microcapsules were studied using various characterizations techniques, including optical microscope, fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and contact angle meter. Spherical microcapsules (size: ～ 60 μm) with smooth surface were obtained when the stirring rate was 400 rpm and the amount of core materials is 76 wt %. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Study on functional microcapsules containing catalysts for controlling the curing time and temperature of epoxy resin

In this study, functional microcapsules (FMs) were designed for controlling the curing time and temperature of epoxy through modifications to thermally expandable microcapsules. The FMs were prepared with a mixture of liquid hydrocarbons and N,N-dimethylbenzylamine in the core, and acrylonitrile (AN)—methyl methacrylate copolymer or AN–methacrylate copolymer were used for the shell. Since the FMs were intentionally designed to have thermally vulnerable polymeric shells, the catalyst in the core could be released at the designated temperature. Therefore, FMs do not activate in epoxy at room temperature; rather, the FMs only become functional when the epoxy is cured under a heated atmosphere. Released catalyst at the higher temperature was confirmed by pyrolysis gas chromatography–mass spectrometry and optical microscopy. This study shows that the results will depend on the different compositions of liquid hydrocarbons and catalyst. Particle size of the capsules was changed with different ratio of catalyst and liquid hydrocarbon at the core and type of polymeric shell. Differential scanning calorimetry and rheometer results showed that higher catalyst loading resulted lower in crystalline and shear thickening temperature, respectively. Adhesion strength of epoxy containing FMs was analyzed by lap shear strength in order to detect the void effect due to released gas from the FM. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47499.     

两个含硫杂环化合物的合成及结构表征

报道了两个新的含硫杂环化合物萘并［２，１－ｂ］噻吩和萘并［２，１－ｄ］噻吩的合成，用元素分析、红外光谱、核磁共振谱及质谱表征产物的结构。     

纤维蛋白原在微胶囊表面的吸附行为

Alginate-chitosan-alginate (ACA) microcapsules have been widely studied as devices for the immuno-isolation and transplantation of living cells.However, long-term survival of the micro-encapsulated cell grafts and thus their potential clinical applications are hampered by the pericapsular fibrotic overgrowth induced by adsorbed protein.In this study, the adsorption behavior of plasma fibrinogen (Fgn) onto ACA microcapsules was studied by using the batch technique.The results showed that the equilibrium time for the adsorption was 24 h.The adsorption of Fgn onto ACA microcapsules fitted very well with Freundlich isotherm, which was indicative of multilayer adsorption.The kinetic experimental data correlated well with the second-order kinetic model,indicating that chemical sorption was the rate-limiting step.The effects of pH and ionic strength on the adsorption were also studied to interpret the mechanism of adsorption.It was found that the amount of adsorbed Fgn decreased with increasing pH in the range of 4.9—7.4.At pH 7.4, the amount of adsorbed Fgn increased with increasing NaCl concentration, and then decreased with further increase in NaCl concentration.At pH 6.0, the amount of adsorbed Fgn decreased with increasing NaCl concentration, indicating that electrostatic interaction was one of the main interactions between Fgn and ACA microcapsules and the positively charged chitosans which was not sufficiently neutralized on the surface of microcapsules induced the adsorption.