Cellulose Acetate, CA muri make.Cellulose Acetate ni ubwoko bwa fibre yakozwe n'abantu, igabanijwemo fibre diacetate na fibre triacetate. Fibre chimique ikozwe muri selile, ihindurwamo acetate ya selile hakoreshejwe uburyo bwa chimique. Yateguwe bwa mbere mu 1865 nka selulose acetate. Nibikoresho bya termoplastique byabonetse mugusuzuma selulose hamwe na acide acike cyangwa anhydride ya acetike ikorwa na catalizator. Ni polymer karemano yahinduwe muburyo bwa esterifike ya hydroxyl muri molekile ya selile hamwe na acide acike. Imikorere yacyo biterwa nurwego rwa acetylation.

01. Ibyiciro bya CA.

Cellulose irashobora kugabanywamo fibre diacetate na fibre triacetate ukurikije urugero rwo gusimbuza hydroxy nitsinda rya acetyl.

Acide Diacetique ikorwa nyuma ya hydrolysis igice cyubwoko bwa acetate, kandi impamyabumenyi ya esterification iri munsi yubwoko bwa acetate ya III. Kubwibyo, imikorere yubushyuhe iri munsi yubwa vinegere eshatu, imikorere yo gusiga irangi iruta iyo vinegere eshatu, kandi igipimo cyo kwinjiza amazi kiri hejuru ya vinegere eshatu.

Acide Triacetic ni ubwoko bwa acetate ifite impamyabumenyi ihanitse idafite hydrolysis. Kubwibyo, ifite urumuri rukomeye nubushyuhe, imikorere mibi yo gusiga irangi hamwe no kwinjiza neza (bizwi kandi ko bigarura ubuhehere).

Mu miterere ya molekulire ya fibre acetate, itsinda rya hydroxyl kumpeta ya selile glucose isimburwa nitsinda rya acetyl kugirango ribe ester bond. Urwego rwa esterification ya fibre diacetate iri munsi yubwa fibre triacetate kubera hydrolysis. Fibre ya Diacetate ifite ahantu hanini amorphous mumiterere ya supramolecular, mugihe fibre triacetate ifite imiterere ya kristaline, kandi guhuza, guhoraho hamwe na kristu ya fibre macromolecules birenze fibre diacetate.

02. Ibyiza bya fibre acetate

Imiterere yimiti

1. Kurwanya Alkali

Intege nke ya alkali ntabwo yangije fibre acetate, kandi igipimo cyo kugabanya ibiro cya fibre cyari gito cyane. Nyuma yo guhura na alkali ikomeye, cyane cyane fibre ya diacetate, biroroshye deacetylate, bigatuma kugabanuka ibiro, imbaraga na modulus nabyo bigabanuka. Kubwibyo, pH agaciro k'igisubizo cyo kuvura fibre acetate ntigomba kurenga 7.0. Mugihe cyo gukaraba gisanzwe, ifite imbaraga zo kurwanya chlorine, kandi irashobora gukama hamwe na tetrachlorethylene.

2. Kurwanya ibishishwa kama

Cellulose acetate yashonga rwose muri acetone, DMF na acide glacial acetic, ariko ntabwo iri muri Ethanol na tetrachlorethylene. Ukurikije ibyo biranga, acetone irashobora gukoreshwa nkumuzunguruko wa fibre acetate, na tetrachlorethylene irashobora gukoreshwa mugusukura byumye imyenda ya acetate.

3. Kurwanya aside

CA ifite aside irwanya imbaraga. Acide isanzwe ya sulfurike, aside hydrochloric na aside nitric ntabwo bizagira ingaruka kumbaraga, kurabagirana no kurambura fibre murwego runaka; Ariko irashobora gushonga muri acide sulfurike yibanze, aside hydrochloric yibanze hamwe na acide nitricike

4. Irangi

Nubwo fibre ya acetate ikomoka kuri selile, igice kinini cyamatsinda ya hydroxyl ya polar kumpeta ya selile glucose isimbuzwa amatsinda ya acetyl kugirango ikore est est mugihe cya esterification. Kubwibyo, amarangi akunze gukoreshwa mugusiga fibre ya selile ntaho ihuriye na fibre acetate kandi biragoye kuyisiga. Irangi ryiza cyane rya fibre acetate ni uburemere buke bwa molekile ikwirakwiza amarangi hamwe nigipimo cyo gufata amarangi.

Fibre ya Acetate cyangwa imyenda irangi irangi irangi ifite ibara ryiza, ingaruka nziza yo kuringaniza, igipimo kinini cyo kwinjiza irangi, kwihuta kwamabara menshi hamwe na chromatografi yuzuye.

umutungo kamere

1. CA ntabwo ifite amazi amwe gusa, ahubwo ifite n'umutungo wo gukuraho vuba nyuma yo kwinjiza amazi

2. Ubushyuhe bwumuriro wa fibre acetate nibyiza. Ubushyuhe bwikirahure bwa fibre bugera kuri 185 ℃, nubushyuhe bwo kurangiza gushonga ni 310 ℃. Iyo ubushyuhe bumaze kuzamuka, igipimo cyo kugabanya ibiro cya fibre ni 90,78%; Imbaraga zo kumena fibre acetate ni 1.29 cN / dtex, mugihe imbaraga ari 31.44%.

3. Ubucucike bwa CA ni buto kuruta ubw'imitsi ya viscose, yegeranye n'iya fibre polyester; Imbaraga nizo hasi cyane muri fibre eshatu.

4. CA ifite ubuhanga bworoshye, busa nubudodo nubwoya

5. Kugabanya amazi abira ni bike, ariko kuvura ubushyuhe bwinshi bizagira ingaruka kumbaraga no kurabagirana kwa fibre, bityo ubushyuhe ntibugomba kurenga 85 ℃

Ibyiza bya Acetate ya Cellulose

1.Diacetate fibre ifite umwuka mwiza kandi urwanya ibintu

Mu bidukikije bifite ubuhehere bugereranije bwa 65%, diacetate ifite iyinjizwa ry’amazi nk’ipamba, kandi ifite imikorere yumye vuba kurusha ipamba, bityo irashobora gukuramo neza imyuka y’amazi ihumeka umubiri wumuntu ikayirekura icyarimwe. Kugira ngo abantu bumve bamerewe neza. Muri icyo gihe, imikorere myiza yo gufata neza irashobora kugabanya ikwirakwizwa ry’amashanyarazi ahamye, ntibyoroshye kubyara amashanyarazi ahamye.

2. Fibre ya diacetate ifite gukorakora byoroshye

Modulus yambere iri hasi, kandi fibre ifite intege nke kandi ihindagurika mugikorwa cyumutwaro muto, werekana imiterere yoroshye, bityo uruhu rufite ibyiyumvo byoroshye kandi byiza. Ariko niba modulus yambere iri hasi cyane, izaba ifite intege nke.

Modulus yambere ni ndende, kandi fibre irakomeye kandi ntabwo byoroshye kugorama munsi yumutwaro muto, werekana imiterere ikomeye.

3. Fibre ya Diacetate ifite imikorere idasanzwe ya deodorizasiyo

Kuki imyenda ya acetate ifite isura nziza?

1. Diacetate fibre ifite urumuri rworoshye nka puwaro

Igice cyambukiranya ubudodo bwa tuteri ni mpandeshatu idasanzwe, naho igice cyambukiranya fibre acetate ni convex idasanzwe. Bombi bafite imirongo miremire ku bice byabo birebire, bigatuma urumuri rwabo runyura rukwirakwira kandi urumuri rurerure rukwirakwira. Igipimo cyo kugabanya ni gito, 1.48. Ubudodo bwa tuteri rero kandi bugaragaza urumuri rworoshye nka puwaro.

2. Acetate ya Cellulose ifite drapability nziza

Modulus yambere ya fibre ni 30-45cn / dtex, gukomera birakomeye, igice cyambukiranya ni convex idasanzwe, imyenda iroroshye, kandi ibyiyumvo byo guswera nibyiza

3. Diacetate fibre ifite amabara meza kandi yihuta

Acetate fibre fibre, chromatografi yuzuye, ibara ryuzuye kandi ryera, amabara meza yihuta.

4. Fibre ya Acetate ifite ihame ryiza rihamye

Finegre fibre ifite kwaguka gake kumazi, bityo ikagira ituze ryiza nyuma yo gukorwa mumyenda kugirango igumane ubwiza bwimyenda.

5. Diacetate fibre ifite imitungo iringaniye irwanya antifouling

Ku mwanda ufite ivumbi, amazi namavuta, ntabwo byoroshye kwanduzwa kandi byoroshye kubisukura