关键词: 紫胶树脂, 聚乙烯醇, 膜, 物理共混, 吸湿性, 亲水性

Abstract: Both PVA and shellac resin are easy to form film , and both of them are mainly used in mem-brane products. In order to improve the poor water vapor permeability and high brittleness of shellac resinafter film formation, PVA was specially added and blended with shellac resin in aqueous phase when w(PVA)was0%,10%,20%, 30% , 40% and 50% , respectively. The feasibility of the two films wasstudied and the film forming process was determined: preparing shellac resin aqueous emulsion and PVAaqueous solution respectively , and mixing them evenly at 50 ℃. Finally, pour the liquid into the petridish , dry and form a film. The surface morphology, water drop contact angle and hygroscopicity of thefilm - forming samples were measured respectively. The results show that PVA and shellac resin have cer.tain physical compatibility, and the addition of PVA improves the compactness of shellac resin mem-brane , and with the increase of PVA content, the compactness of PVA/ shellac resin membrane inereases , and the degree of chemical reaction between them is low. When the mass fraction of PVA was thehighest [a (PVA) 50% ], the hydrophilicity and hygroscopicity of PVA/ shellac resin membrane werethe strongest , which indicated that the addition of PVA improved the hydrophilicity of shellae resin, andthe greater the amount of PVA added, the greater the hydrophilicity and hygroscopicity of the membrane.

Key words: shellac resin:, polyvinyl alcohol , membrane , physical blending:, hygroscopicity , hydrophilicity