I-Cellulose Acetate, CA for short.I-Cellulose Acetate iwuhlobo lwe-fiber eyenziwe ngumuntu, ehlukaniswe i-diacetate fiber kanye ne-triacetate fiber. I-chemical fiber yenziwe nge-cellulose, eguqulwa ibe yi-cellulose acetate ngendlela yamakhemikhali. Yalungiswa okokuqala ngo-1865 njenge-cellulose acetate. Kuyi-resin ye-thermoplastic etholwe nge-esterification ye-cellulose nge-acetic acid noma i-acetic anhydride ngaphansi kwesenzo se-catalyst. Kuyi-polymer yemvelo eguqulwe ngamakhemikhali etholwe nge-esterification ye-hydroxyl kuma-molecule e-cellulose ane-acetic acid. Ukusebenza kwayo kuncike ezingeni le-acetylation.

01. Ukuhlelwa kwe-CA

I-cellulose ingahlukaniswa ibe i-diacetate fiber kanye ne-triacetate fiber ngokwezinga lokushintshwa kwe-hydroxy ngeqembu le-acetyl.

I-Diacetic acid yakheka ngemva kwe-hydrolysis eyingxenye yohlobo I acetate, futhi idigri yayo ye-esterification iphansi kunaleyo yohlobo lwe-acetate yohlobo lwe-III. Ngakho-ke, ukusebenza kokushisisa kungaphansi kwalokhu kweviniga emithathu, ukusebenza kokudaya kungcono kunalokhu kweviniga emithathu, futhi izinga lokumunca umswakama liphakeme kunalelo lamaviniga amathathu.

I-Triacetic acid iwuhlobo lwe-acetate enezinga eliphezulu le-esterification ngaphandle kwe-hydrolysis. Ngakho-ke, inokumelana nokukhanya okuqinile nokushisa, ukusebenza kabi kokudaya kanye nokumunca umswakama ophansi (owaziwa nangokuthi ukubuyiswa komswakama).

Esakhiweni samangqamuzana e-acetate fiber, iqembu le-hydroxyl eringini ye-glucose ye-cellulose lithathelwa indawo iqembu le-acetyl ukuze lenze ibhondi ye-ester. Idigri ye-esterification ye-diacetate fiber iphansi kune-triacetate fiber ngenxa ye-hydrolysis. I-Diacetate fiber inendawo enkulu ye-amorphous esakhiweni se-supramolecular, kuyilapho i-triacetate fiber inesakhiwo esithile se-crystalline, futhi i-symmetry, ukujwayelekile kanye ne-crystallinity ye-fiber macromolecules iphakeme kune-diacetate fiber.

02. Izakhiwo ze-acetate fiber

Izakhiwo zamakhemikhali

1. Ukumelana ne-alkali

I-agent ebuthakathaka ye-alkali ayizange ibangele umonakalo ku-acetate fiber, futhi izinga lokulahlekelwa kwesisindo se-fiber lalincane kakhulu. Ngemuva kokuhlangana ne-alkali eqinile, ikakhulukazi i-diacetate fiber, kulula ukuqeda i-deacetylate, okuholela ekulahlekelweni kwesisindo, amandla kanye ne-modulus nayo iyancipha. Ngakho-ke, inani le-pH lesisombululo sokwelapha i-acetate fiber akufanele lidlule i-7.0. Ngaphansi kwezimo ezijwayelekile zokuwashwa, inokumelana ne-chlorine bleaching eqinile, futhi ingaphinda yomiswe nge-tetrachlorethylene.

2. Ukumelana nezinyibilikisi zemvelo

I-Cellulose acetate incibilika ngokuphelele ku-acetone, i-DMF ne-glacial acetic acid, kodwa hhayi ku-ethanol ne-tetrachlorethylene. Ngokwalezi zici, i-acetone ingasetshenziswa njenge-solvent yokuphotha ye-acetate fiber, futhi i-tetrachlorethylene ingasetshenziselwa ukuhlanza okomile kwezindwangu ze-acetate fiber.

3. Ukumelana ne-Acid

I-CA inokuqina okuhle kokumelana ne-asidi. I-sulfuric acid evamile, i-hydrochloric acid ne-nitric acid ngeke ithinte amandla, ukucwebezela kanye nokwelula kwe-fiber ngaphakathi kwebanga elithile lokuhlushwa; Kodwa ingancibilika ku-sulfuric acid egxilile, i-hydrochloric acid egxilile kanye ne-nitric acid egxilile.

4. Ukudaya

Nakuba imicu ye-acetate itholakala ku-cellulose, ingxenye enkulu yamaqembu e-polar hydroxyl eringini ye-glucose ye-cellulose ithathelwa indawo amaqembu e-acetyl ukuze akhe ama-ester ngesikhathi se-esterification. Ngakho-ke, odayi abavame ukusetshenziselwa ukudaya imicu ye-cellulose cishe abahlobene nemicu ye-acetate futhi kunzima ukudaywa. Odayi abafaneleka kakhulu befayibha ye-acetate bangamadayi ahlakazekayo anesisindo esiphansi samangqamuzana anamazinga afanayo okuthatha udayi.

Ifayibha ye-acetate noma indwangu edaywe ngodayi abahlakazekile inombala ogqamile, umphumela omuhle wokulinganisa, izinga eliphezulu lokumunca udayi, ukushesha kombala okuphezulu kanye ne-chromatography ephelele.

impahla ebonakalayo

1. I-CA ayinakho nje kuphela ukumuncwa kwamanzi okuthile, kodwa futhi inendawo yokususwa ngokushesha ngemva kokumuncwa kwamanzi.

2. Ukuzinza okushisayo kwe-acetate fiber kuhle. Izinga lokushisa lokushintsha kwengilazi lefiber lingaba ngu-185 ℃, futhi izinga lokushisa lokuncibilika licishe libe ngu-310 ℃. Ekupheleni kokukhuphuka kwezinga lokushisa, izinga lokulahlekelwa kwesisindo se-fiber liyi-90.78%; Amandla okuphuka kwefayibha ye-acetate ngu-1.29 cN/dtex, kanti uhlobo luyi-31.44%.

3. Ubuningi be-CA buncane kune-viscose fiber, eseduze ne-polyester fiber; Amandla aphansi kunawo wonke emicu emithathu.

4. I-CA inokunwebeka okuhle ngokuqhathaniswa, okufana nosilika noboya

5. Ukuncipha kwamanzi abilayo kuphansi, kodwa ukwelashwa kwezinga lokushisa eliphezulu kuzothinta amandla nokucwebezela kwefiber, ngakho izinga lokushisa akufanele lidlule ku-85 ℃

Izinzuzo ze-Cellulose Acetate

I-1.I-Diacetate fiber inomoya omuhle wokungena komoya kanye nempahla ye-anti-static

Emvelweni enomswakama olinganiselwe ongu-65%, i-diacetate inokumunca umswakama ofanayo nokakotini, futhi inomsebenzi ongcono wokomisa ngokushesha kunokotini, ngakho ingakwazi ukumunca kahle umhwamuko ohwamuka emzimbeni womuntu futhi iwukhiphe ngesikhathi esifanayo. Ukuze abantu bazizwe bekhululekile. Ngesikhathi esifanayo, ukusebenza kahle kokumunca umswakama kunganciphisa ukuqoqwa kukagesi omile, okungelula ukukhiqiza ugesi omile.

2. I-Diacetate fiber inokuthinta okuthambile

I-modulus yokuqala iphansi, futhi i-fiber ibuthakathaka futhi iguquguquka ngaphansi kwesenzo somthwalo omncane, obonisa uhlamvu oluthambile, ngakho-ke isikhumba sinomuzwa othambile futhi ukhululekile. Kodwa uma i-modulus yokuqala iphansi kakhulu, izoba buthakathaka.

I-modulus yokuqala iphakeme, futhi i-fiber iqinile futhi akulula ukugoba ngaphansi kwesenzo somthwalo omncane, okubonisa uhlamvu oluqinile.

3. I-Diacetate fiber inomsebenzi omuhle wokuqeda iphunga

Kungani indwangu ye-acetate inokubukeka okuhle?

1. I-Diacetate fiber inokucwebezela okuthambile njengeparele

Ingxenye yesiphambano sikasilika kamalibhele iwunxantathu ongajwayelekile, kanti ingxenye ephambanayo ye-acetate fiber iyi-concave convex engavamile. Zombili zinemigqa yobude ezingxenyeni zazo ze-longitudinal, okwenza ukukhanya kwazo okuphambene kuhlakazeke nokukhanya kwe-longitudinal kuhlakazeke. Inkomba ye-refractive iphansi, i-1.48. Ngakho usilika kamalibhele futhi uveza ukucwebezela okuthambile njengeparele.

2. I-Cellulose Acetate inokudonsa okuhle kakhulu

I-modulus yokuqala ye-fiber ingu-30-45cn/dtex, ukuqina akunamandla, ingxenye yesiphambano i-concave engajwayelekile, indwangu ithambile, futhi umuzwa wokudonsa muhle.

3. I-Diacetate fiber inemibala egqamile nokushesha kombala

Umbala we-acetate fiber, i-chromatography ephelele, umbala ogcwele nomsulwa, ukushesha kombala okuhle kakhulu.

4. I-acetate fiber inokuqina okuhle kwe-dimensional

I-vinegar fiber inokunwebeka okuphansi emanzini, ngakho-ke inokuqina okuhle kwe-dimensional ngemva kokwenziwa kwendwangu ukuze kugcinwe ubuhle bezingubo.

5. I-Diacetate fiber ine-antifouling impahla elinganiselayo

Ngokungcola ngothuli, amanzi namafutha, akulula ukungcoliswa futhi kulula ukuwahlanza