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Preparation And Properties Study Of Low Viscosity Hydroxypropyl Starch Size Mixture

Posted on:2016-06-30Degree:MasterType:Thesis
Country:ChinaCandidate:Z H YinFull Text:PDF
GTID:2271330482471673Subject:Textile Engineering
Abstract/Summary:PDF Full Text Request
The low viscosity hydroxypropyl starch(HPS) size mixture was prepared by solvent method in the paper. The results show that the main factors affecting substitution degree and reaction efficiency of HPS were etherification temperature, etherification time, catalyst dosage, bath ratio, water content and etherification dose and so on. The main effects factors of HPS sizing viscosity were etherification temperature, etherification time, catalyst dosage and etherification dose and so on. Under the same conditions, the higher the etherification temperature or the etherification time, the higher the MS and reaction efficiency of HPS. With the catalyst dosage or solvent amount or water content increasing, the MS increased first and then decreased. The MS increased and the reaction efficiency decreased as the dosage of etherification agent increased. HPS sizing viscosity decreased as the etherification temperature, etherification time, the mass fraction of NaOH and dosage of etherification agent increased. The optimum preparation conditions that the etherification temperature was 75 ℃, the etherification time was 10 h, the mass fraction of NaOH up to 6%, bath ratio was 1.95:1, the water content was 5% and the dosage of etherification agent was 20%. Sizing pH value within 5~11 has no significant effect on size film property. When indoor temperature was higher, the mass fraction of preservatives was added up to 0.6%, size film property was best. HPS sizing viscosity was in 20.0 to 25.0 mPa?s, size film of HPS size miture was excellent, adhesion property and sizing effect on pure cotton yarn were better when MS was up to 0.10.The oxidized hydroxypropyl starch(OHPS) size mixture on the basis of the preparation HPS was prepared in the paper by composite modification of oxidation and hydroxypropylation. Influence of sizing viscosity, degree of substitution to OHPS size mixture property was studied. The results show that OHPS size mixture concentration was higher and size viscosity was lower. Its size viscosity thermostability and film-forming property were better. In certain limitation, as the increase of oxidizing agent dosage, sizing viscosity was decreased, breaking strength and elongation of size film was reduced, abrasion resistance was increased. As the increase of substitution degree, size viscosity thermostability was improved, breaking strength and elongation of the size film were both increased, water-soluble speed was increased, sizing adhesion was enlarged. Size film of OHPS size was excellent, adhesion property and sizing effect on pure cotton yarn were better when sizing viscosity was in 9.0 to 12.0 mPa?s and MS was up to 0.30.In order to further improve size mixture properties of OHPS, the size mixture property of oxidation hydroxypropyl carboxymethyl starch(OHPCMS) was prepared by composite modification of oxidation, hydroxypropyl and carboxymethyl. The results show that the MS increased and the DS decreased as the dosage of etherification agent increased. The mass fraction of NaOH was 6%, the chloroacetic acid content was 7%, sizing viscosity was in 10.0 to 14.0 mPa?s, MS reached 0.20, DS reached 0.10 that size film of OHPCMS size mixture was excellent, adhesion property and sizing effect on pure cotton yarn were better. Than influence of add urea to size mixture property of sample were compared. Adding 5% urea in sizing, adhesion property and sizing effect on pure cotton yarn of OHPCMS size mixture were excellent. OHPS was better, CMS was poorer. Characterized and analysised product by infrared spectroscopy and polarized light microscopy and thermal gravimetric.
Keywords/Search Tags:hydroxypropyl starch, oxidation hydroxypropyl starch, oxidation hydroxypropyl carboxymethyl starch, size film property, sizing adhesion property, sizing yarn property
PDF Full Text Request
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