发泡微胶囊仿麂皮工艺探讨

本文主要研究发泡微胶囊的制备及其仿麂皮工艺条件。通过原位聚合法合成发泡微胶囊 ,利用发泡微胶囊的发泡特性进行织物仿麂皮整理 ,确定了最佳的仿麂皮发泡涂层配制工艺     

高温物理发泡微胶囊的制备及其对发泡性能的影响研究

以丙烯腈、甲基丙烯酸甲酯和丙烯酸甲酯为主要的聚合单体,通过添加一定量的第三单体甲基丙烯酸缩水甘油酯(GMA),利用原位聚合法合成了发泡性能优良、应用更加广泛的物理发泡微胶囊;探讨了甲基丙烯酸缩水甘油酯加入量、单体配比及种类、交联剂种类对微胶囊发泡性能的影响;同时对微胶囊的耐溶剂性能做了测试。通过比较得出:当GMA添加量为油相质量的7.9%、丙烯腈与甲基丙烯酸甲酯质量比在8∶1时,可得到高温使用的发泡良好的微胶囊产品;对于三种不同的交联剂的使用发现,三官能度交联剂能制备得到发泡性能最优的发泡微球。同时由耐溶剂性能测试发现,制得的发泡微胶囊对二甲苯、异丙醇、丙酮及环己烷溶剂有很好的抗性。     

扩链剂丁二醇对聚氨酯热膨胀微胶囊性能的影响

通过界面聚合反应,制备了以水性聚氨酯为壳、正己烷为核的热膨胀微胶囊。通过热重仪和激光粒度仪研究了丁二醇对微胶囊包覆量及粒径的影响,采用静态热机械分析仪研究了丁二醇对微胶囊发泡性能的影响。研究结果表明：随着丁二醇用量的增加,微胶囊中正己烷的包覆量略有降低,粒径变化不大,发泡倍率先减小后增大,发泡温度逐步增加;当w（丁二醇）=33.2%（相对于聚氨酯总物质的量而言）时,可以制得平均粒径为78.8 nm、正己烷发泡剂包覆量为13.2%（相对于聚氨酯总质量而言）且性能优良的热膨胀微胶囊;其起始发泡温度为206℃,最大发泡温度为220.1℃,发泡倍率最大为4.10倍。     

丙烯腈-丙烯酸甲酯共聚低温热膨胀微胶囊的制备与性能

以丙烯腈(AN)、丙烯酸甲酯(MA)和甲基丙烯酸甲酯(MMA)为单体,采用悬浮聚合的方式制备出具有核壳结构的低温发泡热膨胀微胶囊。通过激光粒度分析仪和光学显微镜分析产物的形态,考察纳米二氧化硅用量和水相pH对微胶囊粒径大小及分布的影响;通过精密恒温控制热台和金相分析软件测试产物发泡情况,考察了MA用量、反应温度、发泡剂用量、交联剂用量和存放时间对微胶囊发泡性能的影响。结果表明,以22%纳米二氧化硅(油相质量分数,下同),pH=4配制水相,可制备出平均粒径约20μm,分布较窄的微胶囊。MA加入量为7.5%,反应温度为62℃,异丁烷用量为21.4%,交联剂用量为0.12%时制备的微胶囊,初始发泡温度为99℃,稳泡温程为45℃,发泡前后微胶囊平均粒径之比可达约1 5∶。     

立体印花物理发泡微胶囊的研制及其分布

立体印花物理发泡微胶囊的研制及其分布物理发泡立体印花是近代发展起来的印花新技术，它具有强烈的绒绣感和贴花般的风格。本文采用有限凝聚聚合法原位制备了内含低沸点有机溶剂的热膨胀性物理发泡微胶囊。该微胶囊呈正园球状芯／壁结构，具有良好的气密性，平均粒径约３...     

微胶囊发泡剂的合成研究

一、前言微胶囊发泡剂是近年来国外发展起来的新型物理发泡剂,它是由低沸点的囊心和热塑性树脂的囊膜组成的。受热时,囊心液体迅速气化产生内压力,同时囊膜受热软化,在内压力的作用下,囊膜膨胀使体积增大发泡。由于微胶囊发泡剂具有发泡温度低,发泡时间短,发泡无污染等特点而被用来制造     

一种新型耐溶剂发泡微胶囊的制备与性能

通过悬浮聚合法合成制备了1种耐有机溶剂性能极佳的发泡微胶囊,这种微胶囊能够在二甲苯、丁酮、邻苯二甲酸二辛酯、环己烷或者混合溶剂中使用。它的壁材由以丙烯腈为主要单体合成的共聚物组成,芯材由异丁烷和异戊烷混合组成,引发剂为过氧化苯甲酰,交联剂为二丙烯酸丁二醇酯。通过热机械分析、热失重分析及耐溶剂性能测试等一系列分析方法,对微胶囊发泡性能和耐溶剂性能进行了分析,同时还研究了影响微胶囊发泡性能和耐溶剂性能的主要因素。结果表明:当丙烯腈用量为75%,甲基丙烯酸甲酯用量为25%,引发剂用量为单体质量分数1.5%,交联剂用量为单体质量分数0.2%,发泡剂异丁烷和异戊烷用量均为单体质量分数20%,时,制备出的发泡微球的最大发泡温度θm达167.5℃,发泡后密度仅为10.3 kg/m3。同时,发泡微球表现出良好的耐溶剂性能。     

专利介绍

一种热塑性弹性体发泡垫板的制备方法及制品专利申请号：CN200910043952.0公开号：CN101618593申请日：2009年7月24日公开日：2010年1月6日申请人：株洲时代新材料科技股份有限公司一种热塑性弹性体发泡垫板的制备方法及制品,采用热塑性聚氨酯和热塑性聚酯弹性体的共混物为原料,利用微胶囊发泡剂或微胶囊发泡母粒为发泡剂,通过挤出或者先造粒后注塑的工艺成型制成热塑性弹性体发泡垫板。     

专利介绍

聚酯弹性体微发泡板的生产方法 本发明公开了一种可起到减震作用的聚酯弹性体微发泡板的生产方法,其特点是：用聚酯弹性体作为原料,再利用微胶囊化发泡剂或微胶囊化发泡剂母粒,采用挤出机并通过模具成型制成发泡板材。利用该方法制成的聚酯弹性体微发泡板,可提高其使用寿命2．5倍以上,减震效果更优,并能大大降低轮轨动力效应。     

微胶囊发泡剂及立体印花浆中试通过鉴定

广东省肇庆科达合成材料厂和广州市化学工业研究所进行技术合作,通过特殊的分散微化工艺和溶液沉淀聚合方法,在我国首家中试生产微胶囊发泡剂及其立体印花浆,于1992年12月通过广东省科委组织的专家鉴定。中试产品 KDL 型微胶囊发泡印花浆质量符合企业产品标准要求,产品性能达到了国外同类产品技术水平,填补了国内制造微胶囊发泡荆及其印花浆技术的空白。     

Intensified Effect of Reduced Pressure on the Foam Fractionation Process of Bovine Serum Albumin

A novel method to intensify the foam fractionation process by operating the column under reduced pressure was reported in this paper. It was found that a poorer foam stability, a bigger mean bubble size and a wider bubble size distribution in the foam layer, a less upward liquid flux and volumetric liquid fraction at the top of the foam layer, and a higher enrichment ratio but a lower mass recovery of the foam fractionation process were obtained under reduced pressures compared to the ones under atmospheric pressure. The most important effect of the reduced pressure on the foam layer during the foam fractionation process is the encouraged bubble coalescence process which was exhibited by those unusual foam properties discussed above. The limitations of this new method were also discussed.     

腰果酚对聚异氰脲酸酯性能的改性研究

聚异氰脲酸酯(PIR)泡沫是一种新型的热固性保温材料,它具有密度低、耐热性能及耐寒性能优越、阻燃性能好、尺寸稳定性高等优点,但纯PIR泡沫质脆,无法直接使用。为了改善PIR泡沫的韧性,以异氰酸酯和聚醚多元醇为原料,通过腰果酚对其增韧改性,研究了腰果酚用量对PIR泡沫性能的影响。结果表明:引入腰果酚会显著提高PIR的韧性,PIR发泡塑料的密度、压缩强度、韧性均会随着腰果酚用量的增加而变大;而随着腰果酚用量的增加,PIR泡沫吸水率逐渐下降,粉化度下降,导热系数也会降低。加入适量的腰果酚可以改善泡沫的韧性,提高泡沫的保温防水性能。     

氯化聚乙烯/废旧轮胎胶粉共混发泡性能研究

采用模压法进行发泡,以氯化聚乙烯（CM）为基体,研究了胶粉用量、硫化温度、硫化助剂对CM发泡体的泡体性能、泡孔结构的影响。结果表明,CM发泡体随着胶粉用量的增加,发泡密度逐渐增加,泡孔体积及发泡倍率逐渐减少。综合CM发泡体的泡体性能及泡孔结构,当胶粉用量为10份,170℃下硫化7min,使用TCHC作硫化助剂时,可得到发泡效果好,断面均匀分布,泡孔结构明显的CM发泡体。     

Predicting and Controlling the Effect of Solubilized Flavor Oil on Foam Properties of Surfactant through Study of the Adsorption Activity and Configuration

In the wide application of foam products, the effect of oil additive on foam property is a critical issue that has gained increasing attention; the effect on foam induced by various flavor oils is still a puzzling question, and relative study is rare. In this article, a series of typical flavor oils were studied for their effects on the foam properties of sodium dodecylsulfate. Measurements of foamability, foam stability, foam elasticity, and surface activity were taken; meanwhile, molecular dispersion and interfacial arrangement behavior of surfactant and oil molecules were explored by molecular dynamics simulation. Through a combination of macroscopic phenomenon and microscopic information, how flavor oils with different chemical structures affected the foaming properties of surfactants was demonstrated, and an evaluation scheme for predicting the level of influence on foam properties by different flavor oils was constructed. This investigation may help better understand the role of flavor oils in foam systems and provide a theoretical foundation for optimizing the application of flavor oils in relevant industries.     

Analysis of the Effects of Hydrocarbon Chain on Foam Properties of Alkyl Polyglycosides

The influence of surfactant structure on foam properties of different alkyl polyglycosides (APGs) in aqueous solutions was studied. Foamability, foam stability, and foam morphology were analyzed using the FoamScan method. Results showed that the foamability, foam stability, and the liquid carrying ability of long-chain APGs are higher than those of short-chain APGs. Foam morphology analysis showed that the foam produced by short-chain APGs is more unstable than the foam generated by long-chain APGs. Long-chain APGs have stronger intermolecular cohesion force, stringency, and ductility than short-chain APGs.     

Proposed Model to Match the Experimental Results for Oil Displaced by Externally Generated Foam

A mathematical model was developed to predict the performance of the oil displaced by water foam in porous media. In this model, the diffusivity equations of both water foam (the displacing phase) and oil (the displaced phase) were combined in a single equation, which was solved numerically by a finite difference method, using the implicit-explicit method. The proposed model was compared with Poiseueille's model which represents the porous media by straight capillary tubes. It was found that the proposed model is superior to that of Poiseueille, because the Poiseueille model does not take into account the variations in foam properties along the sand pack. The production data used for the proposed model were obtained experimentally from the displacement of oil by water foam of different qualities (externally generated foam). The plastic viscosity of the water foam was measured experimentally for four foam quality ranges using capillary tubes of different sizes. The effective viscosity of the water foam determined from the plastic viscosity was used in the proposed model. Foam viscosity was found to increase as the quality increases, and the water foam obeys a Bingham plastic fluid model. The porous medium was represented by a sand pack whose length was 36 cm and diameter was 6.3 cm. Its absolute permeability was 341 md and porosity was 22.8%. The foam consisted of tap water, surfactant, and nitrogen gas.     

氯化聚乙烯橡胶自由发泡性能的研究

试验研究氢氧化铝、滑石粉和三氧化二锑的用量对氯化聚乙烯橡胶(CM)自由发泡材料的泡孔结构、密度和阻燃性能的影响。结果表明:随着氢氧化铝或滑石粉填料用量的增大,发泡CM的密度增大,泡孔尺寸变小,均匀性变差,发泡体的氧指数随填料用量增大而不断增大,阻燃性能得到提高。三氧化二锑对CM发泡材料泡孔结构及密度影响不大,但在氢氧化铝用量为20份时,少量三氧化二锑能显著提高材料的氧指数。     

低不饱和度聚醚在软泡中的应用研究

以自产聚醚多元醇为主要原料 ,试制成普通块状软泡。讨论了催化剂用量、填料用量、密度等对泡沫性能的影响 ,并与普通软泡聚醚所制泡沫的性能进行比较     

Study on the performance of syntactic foam reinforced by hybrid functionalized carbon nanotubes

Hollow glass microspheres (HGMs)/epoxy syntactic foam were reinforced by hybrid functionalized carbon nanotubes that were synthesized by simultaneous covalent and noncovalent functionalization of carbon nanotubes. The effect of hybrid functionalized carbon nanotubes on density, mechanical properties, and water absorption of HGMs/epoxy syntactic foam was studied. The study indicated that the dispersion of carbon nanotubes in epoxy resin can be improved by hybrid functionalization. The compression strength of syntactic foam reinforced by hybrid functionalized carbon nanotubes was significantly enhanced. The maximum compressive strength of syntactic foam corresponding to chitosan modified carbon nanotubes approached 60 MPa. Hybrid functionalized carbon nanotubes had little effect on the water absorption ability of syntactic foam, and was less than 1%. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48586.     

The effect of wet foam stability on the microstructure and strength of porous ceramics

Wet foam stability is of prime importance in fabricating porous ceramics with the desired microstructure and mechanical properties. In this research, wet foams were fabricated via direct foaming after separately adding an anionic surfactant (TLS) and a cationic surfactant (DTAC) into alumina slurries with a copolymer of isobutylene and maleic anhydride (PIBM) as both the dispersant and the gelling agent. The foam stability was evaluated by a stability analyzer. The bubble size rapidly increased in the wet foam with TLS as the foam stabilizer and many large bubbles appeared within 60 min. The wet foam containing DTAC was very stable. Cationic DTAC increased the hydrophobicity of alumina particles by interacting with the anionic PIBM adsorbed on the particles. The hydrophobically modified particles acted as the foam stabilizer and enhanced the wet foam stability. Furthermore, the fast gelling speed of the slurry containing DTAC also enhanced the wet foam stability. The average cell size of the ceramic with 82.9% porosity from the wet foam with TLS was 188 µm and the compressive strength was 9.7 MPa. The counterparts from the wet foam with DTAC were 54 µm of average cell size and 18.1 MPa of compressive strength. The superior stability of wet foam brought about a smaller cell size and higher strength of the resultant ceramic.