水性壓克力感壓膠乳化聚合性質探討

Emulsion Polymerization and Properties Study of the Water-borne Acrylic PSAs（Pressure Sensitive Adhesives）

姚錦坤(Gin-Kun Yao)

指導教授 ： 洪 信 國

元智大學/工程學院/化學工程與材料科學學系/碩士(2004年)

摘要

本論文主要探討以半批式反應程序製備丙烯酸丁酯（BA）為主體之水性壓克力感壓膠接著劑。藉由改變不同單體間百分比之配比（2-甲基丙烯酸羥乙酯（2-HEMA）與BA或丙烯酸甲酯（MA-L）與BA）、增加起始劑過硫化鈉（SPS）的濃度與縮短單體滴料入料時間、等一系列變因探討反應後乳液之分子量、粒徑與熱裂解溫度的變化及感壓膠性質（速黏度、剝離強度與凝集力）的影響。
實驗証實當BA添加少量2-HEMA單體含量後，感壓膠的速黏度與凝集力變大但剝離強度則變小。反應後乳液之粒徑隨MA-L單體量增加而變小，熱裂解溫度則提高，感壓膠之凝集力變大但速黏度與剝離強度則都變小。增加起始劑(SPS)濃度後，反應後乳液分子量與粒徑都變小。而感壓膠之速黏度與剝離強度則隨起始劑量增加而變小，但凝集力則變大。滴料時間越快，反應後乳液的粒徑與分子量都變大。感壓膠之凝集力變小，速黏度與剝離強度則增加。

關鍵字

乳化聚合 ； 壓克力單體 ； 感壓膠 ； 凝集力 ； 速黏度 ； 剝離強度

並列摘要

The use of the emulsion polymerization to prepare the water-borne acrylic Pressure-Sensitive Adhesives is studied. The effects of the monomer ratio（BA（Butyl Acrylate）/2-HEMA (2-Hydroxyethyl Methacrylate) and BA/MA-L (Methyl Acrylate), the concentration of the SPS （Sdium Persulfate）initiator, and the doping time on the molecule weight, particle diameter, thermal stability of latex, and the adhesion properties of the PSAs (such as tack, peel strength, and cohesion) are analyzed. It is obtained that the increase of 2-HEMA concentration would result in the increase of the tack and cohesion but a decrease of the peel strength of the PSAs. The use of MA-L causes a decrease of the particle size of the latex. In addition, the improvement of the thermal stability and the cohesion but accompanied by the decreases of tack and peel strength are obtained from MA-L formulated PSAs. Moreover, the larger the amount of initiator SPS are used, the lower the molecular weight, the particle size, and the tack, but the greater the peel strength and the cohesion are obtained. Regarding the doping time of the monomer, a decrease of the doping time causes the increase of the molecular weight and particle size of the latex, and the improvement of the tack and peel strength of the PSAs. Yet a deterioration of the cohesion is found by using a shorter doping time during the polymerization.

並列關鍵字

emulsion polymerization ； water-borne acrylic ； Pressure-Sensitive Adhesives ； tack ； peel strength ； cohesion

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