01. Kuiswa kwe cellulose
Cellulose is macromolecular polysaccharide inoumbwa neglucose.Insoluble mumvura uye general organic solvents.Ndiyo chikamu chikuru chechirimwa masero madziro, uye zvakare ndiyo yakanyanya kuparadzirwa uye yakawanda kwazvo polysaccharide muzvisikwa.
Cellulose ndiyo yakanyanya kuwanda inogona kudzokororwa pasi, uye zvakare ndiyo yakasikwa polymer ine yakakura kuunganidza.Iyo ine zvakanakira kuve inogona kuvandudzwa, zvachose biodegradable, uye yakanaka biocompatibility.
02. Zvikonzero zvekugadzirisa cellulose
Cellulose macromolecules ine nhamba huru ye -OH mapoka.Nekuda kwekuita kwehydrogen bond, simba riri pakati pemacromolecules rakakura, izvo zvinozotungamira kune yakakura kunyunguduka enthalpy △H;kune rumwe rutivi, kune zvindori mu cellulose macromolecules.Sezvakaita chimiro, kuomarara kweketani yemamorekuru kwakakura, izvo zvinotungamira kudiki kunyungudika entropy shanduko ΔS.Izvi zvikonzero zviviri zvinoita kuti tembiricha yeyakanyungudutswa cellulose (= △H / △S) ikwire, uye tembiricha yekuora ye cellulose ishoma.Nokudaro, kana cellulose ichipisa kune imwe tembiricha, fiber ichaonekwa Chiitiko chekuti cellulose yakasvibiswa isati yatanga kunyunguduka, saka, kushandiswa kwezvinhu zve cellulose hazvigoni kutora nzira yekutanga kunyunguduka uye kuumba.
03. Kukosha kwekugadzirisa cellulose
Nekuderera zvishoma nezvishoma kwezviwanikwa uye matambudziko ari kuramba achikura ezvakatipoteredza anokonzerwa nemarara emakemikari fiber machira, kusimudzira uye kushandiswa kwezvinhu zvakasikwa zvinodzokororwa faibha zvinhu zvave imwe yenzvimbo dzinopisa dzinotariswa nevanhu.Cellulose ndiyo yakanyanya kuwanda inogona kudzokororwa zviwanikwa mumasikirwo.Iine zvimiro zvemhando yepamusoro senge yakanaka hygroscopicity, antistatic, yakasimba mhepo permeability, yakanaka dyeability, yakagadzikana kupfeka, nyore kugadzira machira, uye biodegradability.Iine maitiro asingaenzaniswi nemakemikari fibers..
Cellulose mamorekuru ane nhamba huru yemapoka e-hydroxyl, ayo ari nyore kuumba intramolecular uye intermolecular hydrogen bond, uye anoora pakupisa kwepamusoro pasina kunyunguduka.Nekudaro, cellulose ine yakanaka reactivity, uye yayo hydrogen bond inogona kuparadzwa nekugadziriswa kwemakemikari kana grafting reaction, iyo inogona kunyatso kudzikisa nzvimbo yekunyungudika.Semhando dzakasiyana dzezvigadzirwa zvemaindasitiri, inoshandiswa zvakanyanya mumachira, kupatsanurwa kwe membrane, mapurasitiki, fodya uye machira.
04. Cellulose etherification kugadziriswa
Cellulose ether rudzi rwekubuda kwe cellulose inowanikwa ne etherification shanduko ye cellulose.Iyo inoshandiswa zvakanyanya nekuda kwekunaka kwayo kukora, emulsification, kumiswa, kuumbwa kwemafirimu, inodzivirira colloid, kuchengetedza mwando, uye adhesion zvivakwa.Inoshandiswa mukudya, mushonga, kugadzira mapepa, pendi, zvekuvaka, nezvimwe.
Etherification ye cellulose inoteedzana yezvinobvamo inogadzirwa nekuita kwemapoka ehydroxyl pa cellulose molecular chain ine alkylating agents pasi pemamiriro ealkaline.Kushandiswa kwemapoka e-hydroxyl kunoderedza nhamba ye intermolecular hydrogen bonds kuderedza masimba e-intermolecular, nokudaro Kuvandudza kugadzikana kwekushisa kwe cellulose, kunatsiridza kushandiswa kwezvinhu, uye panguva imwechete kuderedza kunyunguduka kwe cellulose.
Mienzaniso yemhedzisiro yekugadziriswa kwe etherification pane mamwe mabasa e cellulose:
Vachishandisa donje rakanatswa seyakanyanya mbishi zvinhu, vaongorori vakashandisa nhanho imwe-etherification process kugadzirira carboxymethyl hydroxypropyl cellulose complex ether ine uniform reaction, high viscosity, yakanaka acid kuramba uye munyu kuramba kuburikidza nealkalization uye etherification reactions.Uchishandisa imwe-nhanho etherification process, iyo inogadzirwa carboxymethyl hydroxypropyl cellulose ine yakanaka yemunyu kuramba, acid kuramba uye kunyungudika.Nekuchinja huwandu hwehuwandu hwepropylene oxide uye chloroacetic acid, zvigadzirwa zvine akasiyana carboxymethyl uye hydroxypropyl zviri mukati zvinogona kugadzirwa.Mhedzisiro yemuyedzo inoratidza kuti iyo carboxymethyl hydroxypropyl cellulose inogadzirwa neimwe-nhanho nzira ine pfupi yekugadzira kutenderera, yakaderera solvent kushandiswa, uye chigadzirwa chine kupokana kwakanyanya kune monovalent uye divalent munyu uye yakanaka acid kuramba.
05. Tarisiro ye cellulose etherification modification
Cellulose yakakosha kemikari uye kemikari mbishi zvinhu izvo zvakapfuma muzviwanikwa, zvakasvibira uye zvakatipoteredza zvine hushamwari, uye zvinogona kuvandudzwa.Izvo zvinobva kune cellulose etherification modification zvine mashandiro akanaka, huwandu hwakawanda hwemashandisirwo uye zvakanakisa mhedzisiro yekushandisa, uye inosangana nezvinodiwa zvehupfumi hwenyika kusvika pamwero mukuru.Uye zvinodikanwa zvebudiriro yemagariro, nekuenderera mberi kwetekinoroji uye nekuzadzikiswa kwekushambadzira mune ramangwana, kana zvigadzirwa zvekugadzira uye nzira dzekugadzira dzemaselulosi ezvinobuda dzingave dzakanyanya kugadzirwa, dzichashandiswa zvizere uye nekuziva huwandu hwakawanda hwekushandisa. .Value
Nguva yekutumira: Feb-20-2023