| To solve the problem of insolubility regarding starch sizes in Medium-Low-temperature water.According to the requirements of Medium-low-Temperature sizing in solubility,sizing viscosity,film-forming properties and adhesion properties to textile fibers involving sizes.Modifying the raw starch by acid hydrolysis,quaternary ammonium cation and ethanol-alkali method,the medium-low-temperature water soluble Quaternary ammonium cationic starch suitable for medium-low-temperature sizing was prepared.The specific studies are as follows.?1?The first step:Treating the RS?raw starch?with HCl,got the HS?hydrolyzed starch?,testing the size film performance of HS.After optimization,the preparation process of HS was as follows:the reaction temperature is 60?,the reaction time is 90min,starch concentration is 30%,acid content is 2%.The HS starch slurry viscosity 4.8s?solid content is 6%,No.3 hole of the funnel,water viscosity is 4.3s,RS viscosity is 12.5s?.The HS starch has a good adhesion to textile fibers,however,the stability of freezing and thawing of the slurry is bad,the film properties are bad which is hard to obtain.?2?The second step:The QACS size was prepared by treating the HS starch with CHPTMA,testing its size and film performance.After optimization,the preparation process of QACS was as follows:the reaction temperature was 50?,the reaction time was4h,the molar ratio of starch:CHPTMA:NaOH=1:0.05:0.14,the DS was 0.032,the RE was 64%.The slurry viscosity of the size was 4.9s?solid content 6%?,besides,QACS has low viscosity,satisfying adhesion to textile fiber,good stability of freezing and thawing,and soft film.but it can not dissolve is in Medium-low-temperature water.?3?The third step:The MWQACS size was prepared by dealing the QACS size with ethanol and alkali,testing its size and film performance.After optimization,the preparation process of QACS was as follows:the reaction temperature was 60?,the reaction time was50min,The mole ratio of starch:water:ethanol:base=1mol:20mol:8mol:0.4mol.The slurry viscosity of MWSQACS was 5.7s after pulp?65??,in addition,the size has good water solubility which can be used to middle and low temperature pulp mixing,low viscosity,satisfying adhesion to textile fiber,and good stability of freezing and thawing,soft film.?4?The microstructure and properties of RS,HS,QACS,MWSQACS starch were characterized by means of SEM,FTIR,electrophoretic analysis,energy spectrum analyzer.The results show that:the RS granules were spherical,and the surface was smooth,the surface of QACS and HS starch granules were cracked,and the surface of MWSQACS starch granules showed depression,swelling and void,the sample was found characteristic absorption peak at the wave length of 3400cm-1,2930cm-1,1649cm-1,1362cm-1,577cm-1 and so on,which showed that the four sample were all starches.We can not find any other new characteristic absorption peak in HS.CHPTMA,QACS,and MWSQACS all appeared the characteristic absorption peak at the wave length of 3800cm-1,RS HS starch were neutral containing N elements;QACS,MWSQACS starch were Charged molecules containing N element.?5?Sizing the cotton and polyester/cotton yarn with MWQACS starch,the results shows that the resistance,wear resistance,strong stretch sizing index are compared to the original yarn is improved,to achieve high temperature sizing,weaving to meet production requirements.The research results show that the Preparation procedure of MWSQACS was as follows:RS?HS?QACS?MWSQACS,got the medium-low-temperature water soluble quaternary ammonium cationic starch.The solubility and film properties,size performance,sizing performance can reach the high temperature sizing effect,meeting the requirements of medium-low-temperature sizing,laiding the foundation for the realization of medium-low-temperature sizing slurry. |
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