Cellulose Acetate, CA luv luv.Cellulose Acetate yog ib hom txiv neej tsim fiber ntau, uas tau muab faib ua diacetate fiber thiab triacetate fiber.Cov tshuaj fiber ntau yog ua los ntawm cellulose, uas yog hloov mus rau hauv cellulose acetate los ntawm kev siv tshuaj.Nws tau npaj thawj zaug hauv xyoo 1865 ua cellulose acetate.Nws yog ib qho thermoplastic cob tau los ntawm esterification ntawm cellulose nrog acetic acid los yog acetic anhydride nyob rau hauv qhov kev txiav txim ntawm catalyst.Nws yog cov tshuaj hloov kho ntuj tsim los ntawm esterification ntawm hydroxyl hauv cellulose molecules nrog acetic acid.Nws qhov kev ua tau zoo nyob ntawm qib ntawm acetylation.

01. Kev faib tawm ntawm CA

Cov cellulose tuaj yeem muab faib ua diacetate fiber thiab triacetate fiber ntau raws li qib ntawm hydroxy hloov pauv los ntawm pawg acetyl.

Diacetic acid yog tsim tom qab ib nrab hydrolysis ntawm hom I acetate, thiab nws cov qib esterification qis dua li hom III acetate.Yog li ntawd, qhov kev ua haujlwm cua sov qis dua li ntawm peb lub vinegar, qhov kev ua haujlwm dyeing zoo dua li ntawm peb lub vinegar, thiab qhov nqus dej noo ntau dua li ntawm peb vinegar.

Triacetic acid yog ib hom acetate nrog siab esterification degree yam tsis muaj hydrolysis.Yog li ntawd, nws muaj zog lub teeb thiab kub tsis kam, tsis zoo dyeing kev ua tau zoo thiab tsis tshua muaj noo noo nqus (tseem hu ua noo noo regain).

Nyob rau hauv cov qauv molecular ntawm acetate fiber, pawg hydroxyl ntawm cellulose qabzib nplhaib yog hloov los ntawm acetyl pawg los tsim ester bond.Lub esterification degree ntawm diacetate fiber yog qis dua li ntawm triacetate fiber ntau vim hydrolysis.Diacetate fiber muaj thaj tsam loj amorphous nyob rau hauv cov qauv supramolecular, thaum triacetate fiber ntau muaj cov qauv crystalline, thiab cov symmetry, tsis tu ncua thiab crystallinity ntawm fiber ntau macromolecules yog siab dua diacetate fiber.

02. Cov khoom ntawm acetate fiber

Cov khoom siv tshuaj

1. Alkali tsis kam

Tus neeg sawv cev tsis muaj zog alkali tsis ua rau muaj kev puas tsuaj rau acetate fiber ntau, thiab qhov hnyav ntawm cov fiber ntau tsawg heev.Tom qab ntsib cov alkali muaj zog, tshwj xeeb tshaj yog diacetate fiber, nws yooj yim rau deacetylate, ua rau poob phaus, lub zog thiab modulus kuj txo.Yog li ntawd, pH tus nqi ntawm cov tshuaj rau kev kho mob acetate fiber yuav tsum tsis txhob ntau tshaj 7.0.Nyob rau hauv cov txheej txheem ntxuav, nws muaj cov tshuaj chlorine bleaching tsis kam, thiab tuaj yeem qhuav ntxuav nrog tetrachloroethylene.

2. Kev tiv thaiv rau cov kuab tshuaj organic

Cellulose acetate yog yaj tag hauv acetone, DMF thiab glacial acetic acid, tab sis tsis nyob rau hauv ethanol thiab tetrachloroethylene.Raws li cov yam ntxwv no, acetone tuaj yeem siv los ua cov kuab tshuaj ntawm acetate fiber ntau, thiab tetrachlorethylene tuaj yeem siv rau ziab ntawm acetate fiber ntau cov ntaub.

3. Acid kuj

CA muaj cov kua qaub zoo stability.Feem ntau sulfuric acid, hydrochloric acid thiab nitric acid yuav tsis cuam tshuam lub zog, luster thiab elongation ntawm fiber ntau nyob rau hauv ib tug tej yam concentration ntau yam;Tab sis nws tuaj yeem yaj hauv concentrated sulfuric acid, concentrated hydrochloric acid thiab concentrated nitric acid

4. Dyeing

Txawm hais tias acetate fibers yog muab los ntawm cellulose, ib feem loj ntawm cov polar hydroxyl pawg ntawm cellulose qabzib nplhaib yog hloov los ntawm acetyl pawg los tsim esters thaum esterification.Yog li ntawd, dyes feem ntau siv rau dyeing cellulose fibers yuav luag tsis muaj affinity rau acetate fibers thiab yog nyuaj rau zas.Qhov zoo tshaj plaws dyes rau acetate fiber yog tsawg molecular hnyav disperse dyes nrog zoo li dye uptake tus nqi.

Acetate fiber los yog ntaub dyed nrog disperse dyes muaj xim ci, zoo leveling nyhuv, siab dye absorption tus nqi, siab xim ceev ceev thiab tiav chromatography.

khoom ntiag tug

1. CA tsis tsuas yog muaj qee qhov nqus dej, tab sis kuj muaj cov cuab yeej ntawm kev tshem tawm sai sai tom qab nqus dej.

2. Lub thermal stability ntawm acetate fiber yog zoo.Cov iav hloov pauv kub ntawm cov fiber ntau yog li 185 ℃, thiab qhov kub ntawm qhov kub yog li 310 ℃.Thaum kawg ntawm qhov kub nce, qhov hnyav poob ntawm cov fiber ntau yog 90.78%;Lub zog tawg ntawm acetate fiber yog 1.29 cN / dtex, thaum lub zog yog 31.44%.

3. Qhov ceev ntawm CA yog me dua li ntawm viscose fiber, uas yog ze rau ntawm polyester fiber;Lub zog yog qhov qis tshaj ntawm peb fibers.

4. CA muaj qhov elasticity zoo, zoo ib yam li lo lo ntxhuav thiab ntaub plaub

5. Boiling dej shrinkage yog tsawg, tab sis kev kho kub kub yuav cuam tshuam lub zog thiab luster ntawm fiber ntau, yog li qhov kub yuav tsum tsis pub tshaj 85 ℃

Qhov zoo ntawm Cellulose Acetate

1.Diacetate fiber ntau muaj huab cua permeability zoo thiab cov cuab yeej tiv thaiv zoo li qub

Nyob rau hauv ib puag ncig nrog cov av noo ntawm 65%, diacetate muaj qhov nqus dej zoo ib yam li paj rwb, thiab muaj kev ua kom qhuav sai dua li paj rwb, yog li nws tuaj yeem nqus dej vapor los ntawm tib neeg lub cev thiab tso tawm tib lub sijhawm.Yog li ntawd kom tib neeg xis nyob.Nyob rau tib lub sijhawm, kev ua haujlwm zoo ntawm cov dej noo tuaj yeem txo qhov sib xyaw ntawm cov hluav taws xob zoo li qub, uas tsis yooj yim los tsim hluav taws xob zoo li qub.

2. Diacetate fiber muaj qhov muag muag

Qhov pib modulus yog qhov tsawg, thiab cov fiber ntau tsis muaj zog thiab hloov pauv tau raws li qhov kev txiav txim ntawm cov khoom me me, uas qhia txog tus cwj pwm mos, yog li daim tawv nqaij muaj qhov muag thiab xis nyob.Tab sis yog tias qhov pib modulus qis dhau, nws yuav tsis muaj zog.

Qhov pib modulus yog siab, thiab cov fiber ntau yog nruj thiab tsis yooj yim rau khoov nyob rau hauv qhov kev txiav txim ntawm me me load, uas qhia ib tug nruj cwj pwm.

3. Diacetate fiber muaj qhov ua tau zoo deodorization

Vim li cas acetate ntaub muaj qhov zoo nkauj?

1. Diacetate fiber ntau muaj luster zoo li hlaws

Qhov hla ntawm mulberry txhob lo lo ntxhuav yog daim duab peb sab tsis xwm yeem, thiab ntu ntu ntawm acetate fiber yog qhov tsis sib xws concave convex.Ob leeg ntawm lawv muaj cov kab txaij ntev ntawm lawv cov ntu ntev, ua rau lawv lub teeb transverse diffuse thiab longitudinal teeb diffuse.Lub refractive index yog tsawg, 1.48.Yog li ntawd mulberry txhob lo lo ntxhuav thiab nthuav tawm ib tug mos luster zoo li pearl.

2. Cellulose Acetate muaj drapability zoo heev

Tus thawj modulus ntawm fiber ntau yog 30-45cn / dtex, lub rigidity yog tsis muaj zog, tus ntoo khaub lig seem yog irregular concave convex, cov ntaub yog mos, thiab draping zoo.

3. Diacetate fiber ntau muaj cov xim ci thiab xim ceev ceev

Acetate fiber ntau xim, ua kom tiav chromatography, tag nrho thiab ntshiab xim, zoo heev xim ceev ceev.

4. Acetate fiber muaj qhov ruaj khov zoo

Vinegar fiber tsis tshua muaj kev nthuav dav rau dej, yog li nws muaj qhov zoo ntawm qhov ruaj khov tom qab ua rau hauv cov ntaub los tswj kev zoo nkauj ntawm cov khaub ncaws.

5. Diacetate fiber ntau muaj qhov sib npaug ntawm cov khoom tiv thaiv fouling

Rau cov av nrog plua plav, dej thiab roj, nws tsis yooj yim rau cov kab mob thiab yooj yim los ntxuav