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Study On The Aqueous Synthesis And Sizing Property Of Low-Substituted Carboxymethyl Starch

Posted on:2009-07-21Degree:MasterType:Thesis
Country:ChinaCandidate:L X ZhangFull Text:PDF
GTID:2121360272456651Subject:Textile Engineering
Abstract/Summary:PDF Full Text Request
A series of low-substituted carboxymethyl starch were prepared in aqueous phase by using ClCH2COOH as an etherifying agent for enhancing starch sizing properties and expanding its application. The effects of single factor variation such as the molar ratio of NaOH to ClCH2COOH, reaction temperature, reaction time, starch concentration and the feed ratio of etherifying agent to corn starch on the carboxymethylization were discussed, and the structure of the obtained carboxymethyl starch was characterized by IR. The experimental rusults demonstrated that the etherification efficiency was closely related to the reaction conditions. The reaction efficiency initially increased and then decreased as the concentrations of NaOH and starch increased. It increased when reaction time prolonged in the initial 12h, and basically tended to equilibrium after 12h; while it decreased gradually with the increasing reaction temperature and the decreasing feed ratio of ClCH2COOH to corn starch. The experimental rusults testified that the low-substituted carboxymethyl starch could be obtained in the following parameters: the molar ratio of NaOH to ClCH2COOH was 2.5:1, reaction temperature was 50℃, reaction time was 12, and starch concentration was 30%.With size viscosity, adhesion, film behavior and sizing quality as evaluation indexes, the relationship between the modification extent and the adhesion to fibers was surveyed. The influences of the modification extent on the properties of the size viscosity, adhesion, film and sizing quality were also investigated. The results showed that the starch carboxymethylation could improve the adhesion to cotton and polyester/cotton fibers of corn starch. The adhesion to cotton and polyester/cotton enhanced, while the adesion to polyester decreased gradually. The breaking strength and abrasion resistance of the film decreased slightly as the DS increases. The result of sizing quality testified that the low-substituted carboxymethyl starch could be used as main size, and it could be further increased in blended size recipe to replace more PVA for sizing cotton warp yarns. The queous synthesis was advantageous to reduce the cost of CMS production.
Keywords/Search Tags:carboxymethyl starch, aqueous synthesis, degree of substitution, adhesion, film behavior, sizing
PDF Full Text Request
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