Study On Synthesis And Property Of Rosin-based Polyglucoside

The rosin-based polyglucoside is one kind of alkyl polyglucoside(APG).Atpresent, the short carbon chain fatty alcohol is commonly used as raw material inproducing the alkyl polyglucoside surfactant both at home and abroad. In this workthe fatty alcohol was replaced by the rosin alcohol polyoxyethylene ether in theprocess for preparation of rosin-based polyglucoside. A new production of APG wassynthesized.The rosin alcohol polyoxyethylene ether was synthesized by epoxy ethane androsin alcohol which was modified by rosin. Then the rosin alcohol polyoxyethyleneether and the glucose were used as raw materials in synthesis of a new-type non-ionicsurfactant rosin-based polyglucoside. The synthetic reaction and physical qualities ofrosin alcohol polyoxyethylene ether were examined. The synthetic reaction conditions,surface physicochemical properties and applications of the rosin-based polyglucosidewere studied respectively.The detail conclusions of experiments are shown as follows.1. The suitable synthetic conditions of rosin alcohol polyoxyethylene ether arelisted as follows. The potassium hydroxide is the better catalyst, the amount ofcatalyst KOH is 0.5-0.6%(based on the weight of rosin(g)), the reaction pressure is0.2-0.3MPa, the reaction temperature is 150℃,and the proper conditions of removingwater are 120℃/1.33KPa,30minutes.2. The relation between physical properties of the rosin alcohol polyoxyethyleneether and polymerization degree of ethylene oxide(EO) was studied. With theincreasing of polymerization degree of EO, the reaction time will be prolonged, thecolor of the production becomes darker, the viscosity drops smoothly, the content ofpolyethylene glycol is increasing, and the productive rate is declining.3. The process for preparation of rosin-based polyglucoside in which the glucosewas reacted with the rosin alcohol polyoxyethylene ether in the presence of theparatoluenesulfonic acid as catalyst. Both transglycosidation method and direct i温静卫:松香基葡萄糖苷的合成及性能研究 2004 年 5 月 glycosidation method were used in synthetic process. Reaction temperature, reactionpressure and other conditions which influenced the reaction and production were alsostudied respectively. The suitable synthetic conditions are shown as follows:Transglycosidation method: amount of catalyst paratoluenesulfonic acid is0.07(based on glucose(mol/mol)), the ratio of rosin alcohol polyoxyethylene ether(RAEO) to glucose is 1:1(mol/mol),the ratio of n-butanol to glucose is4.5:1(mol/mol),the reaction temperature for the synthesis of butyl glucoside is 110℃,and the reaction temperature for glycoside exchanging reaction is 140℃.Direct glycosidation method: glucose is introduced batch-wisely, the amount ofcatalyst paratoluenesulfonic acid is 0.1(based on glucose(mol/mol)),the ratio ofglucose to RAEO is 1:1(mol/mol), the reaction temperature is 120℃,and the pressureof this reaction is 0.01MPa.The two methods for synthesis of the rosin-based polyglucoside were compared.It is better to use transglycosidation method than direct glycosidation method for thesynthesis of the rosin-based polyglucoside.4. The relation between surface physicochemical properties of the rosin-basedpolyglucoside and the polymerization degree of ethylene oxide(EO) was studied also.With the increasing of polymerization degree of EO, the surface tension, the criticalmicelle concentration and the lime sop dispersing power go up simultaneity, thefoamy capability changes a little, and the emulsifying power becomes stronger.5. The application experimental results of rosin-based polyglucoside are shownas follows. The rosin-based polyglucoside is fit for emulsifier when thepolymerization degree of EO is fifteen or more. It is more suitable for crude oildemulsifier if the polymerization degree of EO is ten.