Ko te Cellulose Acetate, CA mo te poto.Ko te Cellulose Acetate te ahua o te muka i hangaia e te tangata, ka wehewehea ki te muka diacetate me te muka triacetate. Ko te muka matū he mea hanga ki te cellulose, ka huri hei cellulose acetate ma te tikanga matū. I whakaritea tuatahitia i te tau 1865 hei acetate cellulose. Ko te kapia thermoplastic ka riro mai i te esterification o te cellulose me te waikawa acetic, anhydride acetic ranei i raro i te mahi a te whakakōkī. He waerau matū kua whakarerekētia matū mā te whakahāwea o te hydroxyl i roto i ngā rāpoi ngota cellulose me te waikawa acetic. Ko tana mahi ka whakawhirinaki ki te tohu o te acetylation.

01. Whakarōpū o CA

Ka taea te wehewehea te cellulose ki te muka diacetate me te muka triacetate kia rite ki te tohu o te whakakapi hydroxy e te roopu acetyl.

Ka hangahia te waikawa diacetic i muri i te hauwai o te momo I acetate, a he iti ake tona tohu esterification i tera o te momo III acetate. Na reira, he iti ake te mahi whakawera i nga winika e toru, he pai ake te mahi tae i te winika e toru, a, ko te tere o te makuku o te makuku he nui ake i te winika e toru.

Ko te waikawa Triacetic he momo acetate me te tohu esterification teitei me te kore hauwai. Na reira, he kaha te marama me te wera, he ngoikore te mahi tae me te iti o te makuku (e mohiotia ana ko te makuku hoki).

I roto i te hanganga ngota o te muka acetate, ka whakakapihia te roopu hydroxyl i runga i te mowhiti hukahuka cellulose e te roopu acetyl hei hanga i te here ester. Ko te tohu esterification o te muka diacetate he iti ake i tera o te muka triacetate na te hydrolysis. Ko te muka diacetate he waahi amorphous nui i roto i te hanganga supramolecular, ko te muka triacetate he hanganga tioata, a ko te hangarite, te riterite me te tioata o nga macromolecules muka he teitei ake i te muka diacetate.

02. Nga ahuatanga o te muka acetate

Ngā āhuatanga matū

1. Atete alkali

Ko te kaihoko alkali ngoikore kaore i pakaru te muka acetate, a he iti rawa te mate o te taumaha o te muka. Whai muri i te tutakitanga ki te kawakore kaha, ina koa te muka diacetate, he ngawari ki te deacetylate, na te mea ka heke te taumaha, te kaha me te modulus. Na reira, ko te uara pH o te otinga mo te maimoatanga muka acetate kaua e neke ake i te 7.0. I raro i nga tikanga horoi paerewa, he kaha te aukati chlorine bleaching, ka taea hoki te whakamaroke ki te tetrachloroethylene.

2. Te ātete ki te whakarewa pararopi

Ko te acetate Cellulose kua tino memeha ki te acetone, DMF me te waikawa acetic glacial, engari kaore i roto i te ewaro me te tetrachloroethylene. E ai ki enei ahuatanga, ka taea te whakamahi i te acetone hei whakarewa hurihuri o te muka acetate, ka taea te whakamahi te tetrachlorethylene mo te horoi maroke o nga papanga muka acetate.

3. Atete waikawa

He pai te pumau o te waikawa waikawa a CA. Ko te waikawa pungatara noa, te waikawa pūhaumāota me te waikawa nitric e kore e pa ki te kaha, te kanapa me te whakaroa o te muka i roto i tetahi awhe kukū; Engari ka taea te rewa i roto i te waikawa pungatara, te waikawa hauwai me te waikawa nitric.

4. Waikano

Ahakoa ko nga muka acetate i ahu mai i te cellulose, ko tetahi waahanga nui o nga roopu hydroxyl polar i runga i te mowhiti hukahuka cellulose ka whakakapihia e nga roopu acetyl hei hanga esters i te wa esterification. No reira, ko nga waikano e whakamahia nuitia ana mo te tae o nga muka cellulose he tata kore hononga ki nga muka acetate, he uaua ki te tae. Ko nga waikano tino pai mo te muka acetate ko nga waikano marara te taumaha ngota iti he rite te reiti o te tango waikano.

Ko te muka acetate, he papanga ranei kua pania ki te waikano marara he kanapa te tae, he pai te awe taumata, he nui te tere o te whakauru waikano, he tere te tae me te chromatography.

taonga tinana

1. Ko te CA ehara i te mea he whakauru wai anake, engari he taonga mo te tango tere i muri i te whakauru wai.

2. He pai te pumau o te waiariki o te muka acetate. Ko te pāmahana whakawhiti karaihe o te muka e pā ana ki te 185 ℃, a ko te pāmahana whakamutu rewa e pā ana ki te 310 ℃. I te mutunga o te piki o te pāmahana, ko te 90.78% te tere o te mate taimaha o te muka; Ko te kaha pakaru o te muka acetate ko 1.29 cN/dtex, ko te riaka ko 31.44%.

3. Ko te kiato o CA he iti ake i te muka viscose, e tata ana ki te muka polyester; Ko te kaha te iti rawa o nga muka e toru.

4. He ahua pai te ahua o te CA, he rite ki te hiraka me te huruhuru

5. He iti te paheketanga o te wai kohua, engari ko te maimoatanga o te pāmahana teitei ka pa ki te kaha me te kanapa o te muka, kia kaua e neke ake te pāmahana ki te 85 ℃

Nga painga o te Cellulose Acetate

1.Diacetate muka he pai te uruhanga rangi me te taonga anti-pateko

I roto i te taiao me te haumākū o te 65%, he rite tonu te makuku o te diacetate ki te miro, a he pai ake te whakamaroke tere atu i te miro, na reira ka taea te mimiti i te kohu wai i whakaetohia e te tinana o te tangata me te tuku i te wa ano. Kia pai ai nga tangata. I te wa ano, ka taea e te pai o te whakauru makuku te whakaheke i te kohinga o te hiko hiko, ehara i te mea ngawari ki te whakaputa hiko hiko.

2. Ko te muka diacetate he pa ngawari

He iti te modulus tuatahi, he ngoikore te muka me te ngawari i raro i te mahi o te kawenga iti, e whakaatu ana i te ahua ngawari, na te kiri he ahua ngawari me te pai. Engari ki te iti rawa te waahanga tuatahi, ka ngoikore.

He teitei te kōwae tuatahi, he mārō te muka me te kore e ngawari ki te whakapiko i raro i te mahi a te kawenga iti, e whakaatu ana i te ahua maro.

3. Ko te muka diacetate he tino mahi whakahekenga

He aha te ahua pai o te papanga acetate?

1. Ko te muka o te diacetate he whiti ngawari ano he peara

Ko te wahanga whiti o te hiraka maperi he tapatoru kohikohiko, a ko te wahanga whiti o te muka acetate he porowhita kopikopiko. He karawhiu roa o raua e rua i runga i o raua wahanga roa, e marara ana te marama whakawhiti me te marama roa. He iti te taupū whakaata, 1.48. No reira he hiraka maperi me te whakaatu i te kanapa ngawari ano he peara.

2. Cellulose Acetate he pai rawa te drapability

Ko te waahanga tuatahi o te muka ko te 30-45cn/dtex, he ngoikore te rigidity, he korikori te wahanga o te whitinga, he ngawari te papanga, he pai te ahua o te draping.

3. He kanapa nga tae me te tere o te tae o te muka diacetate

Te tae muka acetate, te chromatography oti, te tae ki tonu me te parakore, te tere o te tae.

4. Ko te muka acetate he pai te pumau o te ahu

He iti te roha o te muka winika ki te wai, no reira he pai te ahua o te ahua i muri i te hanga hei papanga hei pupuri i te ataahua o nga kakahu.

5. Ko te muka diacetate he tino taurite nga taonga antifouling

Mo te paru me te puehu, te wai me te hinu, ehara i te mea ngawari te poke me te ngawari ki te horoi