Inkqubo ye-ECF elemental chlorine-free bleaching for bamboo tissue

Sinembali ende yokwenza iphepha le-bamboo eTshayina. I-bamboo fiber morphology kunye nokwakheka kweekhemikhali zikhethekileyo. Umndilili wobude befayibha ubude, kwaye i-microstructure ye-fiber cell wall ikhethekile. Ukusebenza kophuhliso lwamandla ngexesha le-pulping kulungile, ukunika i-pulp exutywe iipropathi ezilungileyo ze-opacity ephezulu kunye ne-coefficient yokusabalalisa ukukhanya. Umxholo we-lignin wezinto eziluhlaza ze-bamboo (malunga ne-23% -32%) uphezulu, omisela isixa esiphezulu se-alkali kunye ne-sulfidation degree ngexesha lokucofa nokupheka (iqondo le-sulfidation ngokubanzi li-20% -25%), elikufutshane ne-coniferous wood. Umgangatho ophezulu we-hemicellulose kunye ne-silicon yemathiriyeli ekrwada kwakhona kuzisa ubunzima obuthile ekusebenzeni okuqhelekileyo kokuhlamba i-pulp kunye nokuphuma kotywala obumnyama kunye nenkqubo yezixhobo zoxinaniso. Ngaphandle koku, izinto ezikrwada ze-bamboo ziseyinto elungileyo yokwenza iphepha.

Inkqubo yokuxutywa kwezityalo zemichiza emikhulu kunye nobukhulu obuphakathi kwi-bamboo iya kwamkela ngokusisiseko inkqubo ye-TCF okanye ye-ECF yokucoca. Ngokuqhelekileyo, kudityaniswe ne-deignification enzulu kunye ne-oxygen delignification ye-pulping, i-TCF okanye i-ECF ye-bleaching technology isetyenziswa. Ngokuxhomekeke kwinani lezigaba zokujija, i-bamboo pulp inokufakwa ibleach ukuya kwi-88% -90% yokukhanya.

Iithishu zethu ze-bamboo pulp ezifakwe i-bleached zonke zifakwe i-bleach nge-ECF (engena-chlorine ye-elemental), elahlekelwa yi-bleach encinci kwi-bamboo pulp kunye ne-pulp viscosity ephezulu, ngokubanzi ifikelela ngaphezulu kwe-800ml/g. Iithishu ze-bamboo ezifakwe i-bleached ze-ECF zinomgangatho ongcono we-pulp, zisebenzisa iikhemikhali ezimbalwa, kwaye zisebenza kakuhle nge-bleach. Kwangaxeshanye, inkqubo yezixhobo ivuthiwe kwaye ukusebenza kwayo kuzinzile.

Amanyathelo enkqubo ye-ECF elemental chlorine-free bleaching of bamboo tissues zezi: okokuqala, ioksijini (02) ifakwe kwinqaba ye-oxidation ye-oxidative delignification, kwaye emva koko i-D0 bleaching-washing-Eop extraction-washing-D1 bleaching-washing iqhutywa ngokulandelelana emva kokuhlamba. Iikhemikhali eziphambili ze-bleaching agents ziyi-CI02 (i-chlorine dioxide), i-NaOH (i-sodium hydroxide), i-H202 (i-hydrogen peroxide), njl. Ubumhlophe be-bamboo pulp tissue enokufikelela ngaphezu kwama-80%.