Cellulose Acetate, CA ee gaaban. Fiber kiimikaad wuxuu ka samaysan yahay cellulose, kaas oo loo beddelo acetate cellulose habka kiimikaad. Waxaa markii ugu horreysay la diyaariyey 1865 sida acetate cellulose. Waa resin thermoplastic ah oo lagu helo esterification of cellulose leh acetic acid ama acetic anhydride oo hoos timaada ficilka kicinta. Waa polymer dabiici ah oo kiimiko ahaan wax laga beddelay oo lagu helay esterification hydroxyl ee molecules cellulose leh acetic acid. Waxqabadkeedu wuxuu ku xiran yahay heerka acetylation.

01. Kala soocidda CA

Cellulose waxaa loo qaybin karaa fiber diacetate iyo fiber triacetate iyadoo loo eegayo heerka beddelka hydroxy ee kooxda acetyl.

Diacetic acid waxaa la sameeyaa ka dib qayb ka mid ah hydrolysis ee nooca I acetate, iyo shahaadada esterification waxay ka hooseysaa nooca III acetate. Sidaa darteed, waxqabadka kuleylku wuu ka hooseeyaa seddexda khal, waxqabadka dheeha ayaa ka fiican kan saddexda khal, iyo heerka nuugista qoyaanku wuu ka sarreeyaa midka saddexda khal.

Triacetic acid waa nooc ka mid ah acetate oo leh shahaadada esterification sare iyada oo aan lahayn hydrolysis. Sidaa darteed, waxay leedahay iftiin xoog leh iyo caabbinta kulaylka, waxqabadka midabaynta liidata iyo nuugista qoyaanka hooseeya (sidoo kale loo yaqaan dib u soo celinta qoyaanka).

Qaab dhismeedka molecular ee fiber acetate, kooxda hydroxyl ee giraanta gulukooska cellulose waxaa lagu bedelay kooxda acetyl si ay u sameeyaan bond ester. Heerka esterification ee fiber diacetate ayaa ka hooseeya kan fiber triacetate sababtoo ah hydrolysis. Fiber Diacetate waxay leedahay amorphous weyn oo qaab dhismeedka supramolecular ah, halka fiber triacetate uu leeyahay qaab-dhismeedka crystalline gaar ah, iyo summetry, joogtaynta iyo crystallinity ee macromolecules fiber ayaa ka sarreeya fiber diacetate.

02. Qalabka loo yaqaan 'acetate fiber'

Waxyaabaha kiimikada

1. Iska caabin alkali ah

Wakiilka daciifka ah ee alkali ma uusan waxyeello u geysan fiber acetate, iyo miisaanka luminta fiber-ka ayaa ahaa mid aad u yar. Ka dib markii uu la kulmo alkali xooggan, gaar ahaan fiber diacetate, way fududahay in la deacetylate, taas oo keenta miisaan lumis, xoogga iyo modules sidoo kale hoos u dhaco. Sidaa darteed, qiimaha pH ee xalka lagu daaweynayo fiber acetate waa inuusan dhaafin 7.0. Marka la eego xaaladaha dhaqidda caadiga ah, waxay leedahay iska caabin adag oo koloriin ah, sidoo kale waxaa lagu nadiifin karaa tetrachlorethylene.

2. Iska caabinta dareerayaasha organic

Cellulose acetate ayaa si buuxda ugu milmay acetone, DMF iyo glacial acetic acid, laakiin kuma jiraan ethanol iyo tetrachlorethylene. Marka loo eego sifooyinkaas, acetone waxaa loo isticmaali karaa sida dareeraha wareega ee fiber acetate, iyo tetrachlorethylene waxaa loo isticmaali karaa nadiifinta qalalan ee dharka fiber acetate.

3. caabbinta aysiidhka

CA waxay leedahay xasillooni caabbinta aashitada oo wanaagsan. Ashitada sulfuric ee caadiga ah, aashitada hydrochloric iyo nitric acid ma saameyn doonto xoogga, dhaldhalaalka iyo fidinta fiberka gudaha xad gaar ah; Laakiin waxa lagu milmi karaa sulfuric acid, hydrochloric acid iyo nitric acid.

4. Midabaynta

Inkasta oo fiilooyinka acetate ay ka soo jeedaan cellulose, qayb weyn oo ka mid ah kooxaha hydroxyl polar ee giraanta gulukooska cellulose ayaa lagu beddelaa kooxaha acetyl si ay u sameeyaan esters inta lagu jiro esterification. Sidaa darteed, dheeha sida caadiga ah loo isticmaalo dheehidda fiilooyinka cellulose ayaa ku dhawaad ​​wax xidhiidh ah la lahayn fiilooyinka acetate wayna adagtahay in la dheehdo. Midabada ugu habboon ee fiber acetate waa miisaan yar oo unugyo kala firdhiya midabyo leh heerar dheeha la mid ah.

Fiber Acetate ama dharka lagu rinjiyeeyay midabyo kala firdhiyey ayaa leh midab dhalaalaya, saameyn heer sare ah, heerka nuugista dheeha sare, midabka midabka sare iyo chromatography dhamaystiran.

hanti jireed

1. CA kaliya maaha inay leedahay nuugista biyaha qaarkood, laakiin sidoo kale waxay leedahay hantida ka saarista degdega ah ka dib nuugista biyaha

2. Deganaanshaha kulaylka ee fiber acetate waa mid wanaagsan. Heerkulka kala-guurka dhalada ee fiberku waa qiyaastii 185 ℃, heerkulku wuxuu joojinayaa dhalaalku waa ilaa 310 ℃. Dhamaadka heerkulka sare u kaca, heerka miisaanka luminta fiberku waa 90.78%; Awoodda jebinta ee fiber acetate waa 1.29 cN/dtex, halka culaysku yahay 31.44%.

3. Cufnaanta CA way ka yar tahay tan fiilada viscose, taas oo u dhow tan fiber polyester; Xooggu waa kan ugu hooseeya ee saddexda fiil.

4. CA waxay leedahay dabacsanaan aad u wanaagsan, oo la mid ah xariirta iyo dhogorta

5. Biyo-yarida biyaha karkaraya waa hooseeyaan, laakiin daaweynta heerkulka sare waxay saameyn doontaa xoogga iyo dhalaalka fiber-ka, markaa heerkulku waa inuusan dhaafin 85 ℃

Faa'iidooyinka Cellulose Acetate

1.Diacetate fiber waxay leedahay hawo wanaagsan oo hawo leh iyo hanti ka hortag ah

Deegaanka uu qoyaanku ka kooban yahay 65%, diacetate waxay leedahay nuugista qoyaan la mid ah tan suufka, waxayna leedahay waxqabad qallajin degdeg ah oo ka wanaagsan suufka, sidaas darteed waxay si fiican u nuugi kartaa uumiga biyaha ee uumibixiyo jidhka bini'aadamka oo ay sii daayaan isku mar. Si ay dadku u dareemaan raaxo. Isla mar ahaantaana, waxqabadka nuugista qoyaanka ee wanaagsan wuxuu yarayn karaa ururinta korantada taagan, taas oo aan sahlanayn in la soo saaro koronto taagan.

2. Fiber Diacetate waxay leedahay taabasho jilicsan

Module-ka bilawga ah waa mid hooseeya, fiber-kuna waa daciif oo dabacsan marka la eego ficilka culeyska yar yar, oo muujinaya dabeecad jilicsan, sidaas darteed maqaarku wuxuu leeyahay dareen jilicsan oo raaxo leh. Laakiin haddii module-ka bilowga ahi uu aad u hooseeyo, way daciifi doontaa.

Module-ka bilawga ah waa mid sarreeya, fiberkuna waa mid adag oo ma fududa in la leexiyo marka la eego ficilka culeyska yar, oo muujinaya dabeecad adag.

3. Fiber Diacetate waxa uu leeyahay wax qabad carfis ah oo aad u wanaagsan

Waa maxay sababta dharka acetate ay u leedahay muuqaal wanaagsan?

1. Fiber Diacetate waxay leedahay dhalaal jilicsan sida luul

Qaybta iskutallaabta ee xariirta bulberry waa saddex xagal aan joogto ahayn, iyo qaybta iskutallaabta ee fiber acetate waa concave concave aan joogto ahayn. Labaduba waxay leeyihiin xariijimo dhaadheer oo ku yaal qaybahooda dhaadheer, taasoo ka dhigaysa iftiinkooda kala-wareega ah iyo iftiinka dhaadheer ee fidsan. Tusmada dib-u-celinta ayaa hooseeya, 1.48. Markaa xariirta mulberry waxayna soo bandhigaysaa dhalaal jilicsan sida luul.

2. Cellulose Acetate waxay leedahay dabacsanaan aad u fiican

Module-ka bilowga ah ee fiber-ku waa 30-45cn/dtex, qallafsanaantu waa daciif, qaybta iskutallaabtu waa concave convex aan joogto ahayn, dharku waa jilicsan yahay, dareenka duubista ayaa wanaagsan.

3. Fiber Diacetate wuxuu leeyahay midabyo dhalaalaya iyo midab adag

Midabka fiber Acetate, chromatography dhamaystiran, midab buuxa oo saafi ah, midab aad u fiican.

4. Fiber Acetate waxay leedahay xasillooni cabbir wanaagsan

Fiber khalku wuxuu leeyahay balaadhin hoose oo biyaha ah, sidaas darteed waxay leedahay xasillooni cabbir wanaagsan ka dib markii laga sameeyay dhar si loo ilaaliyo quruxda dharka.

5. Fiber Diacetate waxa uu leeyahay hanti ka hortag ah oo dheellitiran

Wasakh leh boodh, biyo iyo saliid, ma fududa in la wasakheeyo oo si fudud loo nadiifiyo