Cellulose Acetate, CA for short.Cellulose Acetate imhando yefiber yakagadzirwa nevanhu, iyo yakakamurwa kuva diacetate fiber uye triacetate fiber. Iyo kemikari fiber inogadzirwa ne cellulose, iyo inoshandurwa kuita cellulose acetate nemakemikari nzira. Yakatanga kugadzirirwa muna 1865 se cellulose acetate. Iyo thermoplastic resin inowanikwa ne esterification ye cellulose neacetic acid kana acetic anhydride pasi pechiito che catalyst. Iyo ikemikari yakagadziridzwa yakasikwa polymer inowanikwa ne esterification ye hydroxyl mu cellulose mamorekuru ane acetic acid. Kuita kwayo kunoenderana nehuwandu hweacetylation.

01. Kurongwa kweCA

Iyo cellulose inogona kukamurwa kuita diacetate faibha uye triacetate fiber zvinoenderana nedhigirii rehydroxy inotsiva neacetyl boka.

Diacetic acid inoumbwa mushure mechidimbu hydrolysis yerudzi I acetate, uye dhigirii rayo reesterification rakaderera pane iro rerudzi III acetate. Naizvozvo, kudziya kwekuita kwakadzikira pane kuya kwevhiniga mitatu, kuita kwekudhaya kuri nani pane kuya kwevhiniga mitatu, uye mwero wekunyudza hunyoro wakakwira kupfuura wevhiniga mitatu.

Triacetic acid imhando yeacetate ine yakakwira esterification degree isina hydrolysis. Naizvozvo, ine mwenje wakasimba uye inodzivirira kupisa, kuita kushoma kwekudhaya uye kunyura kwakadzika (kunozivikanwawo sekuti mwando kudzorera).

Mune mamolecular chimiro cheacetate fiber, boka rehydroxyl pa cellulose glucose mhete rinotsiviwa neboka reacetyl kuti rigadzire ester bond. Iyo esterification degree ye diacetate fiber yakaderera pane iyo ye triacetate fiber nekuda kwehydrolysis. Diacetate fiber ine yakakura amorphous nzvimbo mune supramolecular chimiro, nepo triacetate fiber ine imwe crystalline chimiro, uye symmetry, kugara uye crystallinity ye fiber macromolecules yakakwirira kupfuura diacetate fiber.

02. Zvinhu zveacetate fiber

Chemical properties

1. Alkali kuramba

Iyo isina kusimba alkali mumiriri haina kukonzera kukanganisa kune acetate fiber, uye uremu hwekuremerwa kwefiber hwaive hudiki kwazvo. Mushure mekusangana nealkali yakasimba, kunyanya diacetate fiber, zviri nyore ku deacetylate, zvichiita kuti uremu huremerwe, simba uye modulus zvakare inoderera. Naizvozvo, iyo pH kukosha kwemhinduro yekurapa acetate fiber haifanire kudarika 7.0. Pasi pemamiriro ekugeza akajairika, ine yakasimba chlorine bleaching resistance, uye inogona zvakare kuoma kucheneswa ne tetrachlorethylene.

2. Kuramba kune organic solvents

Cellulose acetate yakanyungudika zvachose muacetone, DMF uye glacial acetic acid, asi kwete mu ethanol uye tetrachlorethylene. Zvinoenderana neaya maitiro, acetone inogona kushandiswa seinotenderera inonyungudika yeacetate fiber, uye tetrachlorethylene inogona kushandiswa kuomesa kuchenesa kweacetate fiber machira.

3. Acid resistance

CA ine yakanaka acid kuramba kugadzikana. Yakajairwa sulfuric acid, hydrochloric acid uye nitric acid haizokanganisa simba, kupenya uye kurebesa kwefiber mukati meimwe nzvimbo yekusimbisa; Asi inogona kunyungudutswa mune yakanyungudutswa sulfuric asidhi, yakadzika hydrochloric acid uye yakawedzera nitric acid.

4. Kudhaya

Kunyange zvazvo acetate fibers inotorwa kubva ku cellulose, chikamu chikuru chepolar hydroxyl mapoka pa cellulose glucose ring inotsiviwa nemapoka eacetyl kuti aumbe ester panguva ye esterification. Naizvozvo, madhayi anowanzo shandiswa pakudhaya selulosi faibha anenge asina hukama hweacetate fiber uye anonetsa kudhaya. Madhayi akakodzera kwazvo eacetate faibha akaderera mamorekuru uremu hwekuparadzira madhayi ane madhayi akafanana ekutora mazinga.

Acetate faibha kana jira rakadhayiwa nedhayi dzakapararira rine ruvara rwakajeka, yakanaka kuyera mhedzisiro, yakakwira dhayi kunyudzwa mwero, kukurumidza kwemavara uye yakazara chromatography.

pfuma chaiyo

1. CA haingove nekumwe kunyura kwemvura, asi inewo pfuma yekubvisa nekukurumidza mushure mekutora mvura.

2. Kugadzikana kwekupisa kweacetate fiber yakanaka. Iyo tembiricha yekuchinja yegirazi yefiber ingangoita 185 ℃, uye tembiricha yekunyunguduka ingangoita 310 ℃. Pakupera kwekupisa kwekushisa, chiyero chekurasikirwa kwefiber ndicho 90.78%; Simba rekupwanya reacetate fiber i1.29 cN/dtex, nepo kunetsa kuri 31.44%.

3. Kuwanda kweCA kuduku kudarika kweviscose fiber, iyo iri pedyo neyo polyester fiber; Simba ndiro rakaderera pamafibhi matatu.

4. CA ine elasticity yakanaka, yakafanana nesilika nemvere dzemakwai

5. Mvura inofashaira shrinkage yakadzikira, asi kupisa kwakanyanya kurapwa kuchakanganisa simba uye kupenya kwefiber, saka tembiricha haifanire kudarika 85 ℃

Zvakanakira Cellulose Acetate

1.Diacetate fiber ine simba rakanaka remhepo uye anti-static pfuma

Munzvimbo ine hunyoro hwe65%, diacetate ine hunyoro hwakafanana nedonje, uye ine zvirinani kuomeswa nekukurumidza kupfuura donje, saka inokwanisa kutora mhute yemvura inobuda nemuviri wemunhu nekuiburitsa panguva imwe chete. Kuti vanhu vanzwe vakasununguka. Panguva imwecheteyo, kuita zvakanaka kunyura hunyoro kunogona kuderedza kuunganidzwa kwemagetsi akamira, izvo zvisiri nyore kugadzira magetsi akamira.

2. Diacetate fiber ine nyoro kubata

Iyo yekutanga modulus yakaderera, uye fiber haina simba uye inoshanduka pasi pechiito chemutoro muduku, ichiratidza unhu hunyoro, saka ganda rine manzwiro akapfava uye akasununguka. Asi kana yekutanga modulus yakanyanya kuderera, inenge isina simba.

Iyo yekutanga modulus yakakwirira, uye fiber yakasimba uye haisi nyore kukotama pasi pechiito chemutoro muduku, kuratidza unhu hwakaoma.

3. Diacetate fiber ine yakanakisa deodorization performance

Sei jira reacetate rine chimiro chakanaka?

1. Diacetate fiber ine soft luster separera

Muchinjikwa wemuhabhurosi sirika hauenzaniswi katatu, uye chikamu chemuchinjiko cheacetate faibha haina kurongeka concave convex. Ose ari maviri ane mitsetse yakarebesa pazvikamu zvadzo zvenguva refu, zvichiita kuti chiedza chazvo chakachinjika chipararire uye chiedza chenguva refu chipararire. Iyo refractive index yakaderera, 1.48. Saka sirika yemurubheri uye inopa kupenya kwakapfava separera.

2. Cellulose Acetate ine yakanakisa drapability

Iyo yekutanga modulus ye fiber ndeye 30-45cn / dtex, iyo kuomarara haina kusimba, chikamu chemuchinjiko hachina kurongeka concave convex, jira rakapfava, uye kunzwa kwekudonha kwakanaka.

3. Diacetate fiber ine mavara akajeka uye kukurumidza kwemavara

Acetate fiber color, yakazara chromatography, yakazara uye yakachena ruvara, yakanakisa ruvara kukurumidza.

4. Acetate fiber ine yakanaka dimensional kugadzikana

Vinegar fiber ine yakaderera kuwedzera kumvura, saka ine yakanaka dimensional kugadzikana mushure mekugadzirwa mucheka kuchengetedza runako rwembatya.

5. Diacetate faibha ine yakaringana antifouling pfuma

Kune tsvina ine guruva, mvura nemafuta, hazvisi nyore kusvibiswa uye nyore kuchenesa