Study on the Preparation and Properties of Oxidized Hydroxypropyl Starch-Based Plastic Wrap
In this paper,oxidized hydroxypropyl starch was used as the film-forming substrate to prepare a green environmental protection plastic wrap with excellent comprehensive performance.Different plasticizers(glycerin,sorbitol)and cross-linking agents(sodium trimetaphosphate,citric acid,CaCl2)were used to modify hydroxypropyl starch oxide.The effects of different additives on the performance of plastic wrap and the effect of plastic wrap on the preservation effect of cherry tomatoes were analyzed.The results showed that the elongation at break of plastic wrap with a ratio of glycerol to sorbitol was 5:3 and the elongation at break was increased by 32 times compared with pure starch film.Compared with the unmodified starch film,the performance of the starch film modified by the crosslinker was improved to different degrees,among which the starch film modified by sodium trimetaphosphate crosslinking had obvious effects,its tensile strength increased by 4 times,water resistance increased by 1.5 times,and moisture permeability decreased by 74%.The modified plastic wrap has the characteristics of high water resistance and low moisture permeability,which is more conducive to freshness,and the weight loss rate compared with the blank group is reduced by 77%after 8 days.The freshness preservation effect has been improved.
fresh-keeping filmoxidation of hydroxy propylene starchplasticizercross-linking agent
NETL
NSTL
万方数据
