Ngā Whakamahinga o te Waikawa Acetic i roto i te Ahumahi
Ko te waikawa acetic tētahi o ngā matū taketake tino nui o te ao ahumahi. E mōhiotia whānuitia ana tēnei matū hei wāhanga matua o te winika i roto i ngā kukū iti, engari i roto i te horopaki ahumahi, ka hangaia te waikawa acetic, ā, ka whakamahia i roto i ngā kukū teitei (hukapapa) mō ngā tukanga hanga rerekē. Mā te tātai matū CH₃COOH, ko te waikawa acetic he waikawa waro māmā he kakara kakara, he waikura i ngā kukū teitei, ā, he ngāwari ki te wairewa i roto i te wai me te maha o ngā whakarewa waro. Nā tēnei huinga o ngā āhuatanga ka tino whai hua mō te whakamahi i roto i ngā rāngai maha, mai i ngā ahumahi matū, kakahu, kai, rongoā, me te pūngao.
1. Te waikawa acetic hei rauemi matū
Ko te whakamahinga nui rawa atu o te waikawa acetic i roto i ngā ahumahi ko te rauemi mata mō te hanga i ngā mea e ahu mai ana i ngā hua kaihoko maha. I te ao whānui, ko te nuinga o te whakamahinga o te waikawa acetic e whakamahia ana i roto i te hanga o:
a. Monomer acetate vinyl (VAM)
Ko te monomer vinyl acetate te pūtake matua o te waikawa acetic, ā, e whakamahia ana hei hanga i ngā polymer pērā i te polyvinyl acetate (PVAc) me te polyvinyl alcohol (PVA). He mea tino nui ēnei hua i roto i ngā ahumahi e whai ake nei:
– He piripiri rakau me te piripiri pepa, tae atu ki te piripiri mā.
– Ngā peita me ngā paninga e hangai ana ki te emulsion, e whakamahia whānuitia ana i roto i ngā peita o roto.
– He mea here mō ngā kakahu me te pepa.
He tino rautaki te VAM nā te mea kei roto i ngā taonga o ia rā tōna hua whakamutunga—mai i te takai ki ngā tāonga whare me ngā rauemi hanga whare.
b. Āniwaira Ākiti (āniwaira Ākiti)
He matū ahumahi nui te anhydride acetic mō te tukanga acetylation (te tāpiri i tētahi rōpū acetyl). Ko ōna whakamahinga ko:
– Te hanga o te cellulose acetate, he rauemi mō ngā kiriata, ngā tātari hikareti, me ētahi muka kakahu.
– He rauemi takawaenga mō te hanga i ētahi hua rongoā me ngā matū pai.
c. Ngā ester acetate (hei tauira, te acetate ethyl, te acetate butyl)
Ka tauhohe te waikawa acetic ki te waipiro hei hanga i ngā esters. E whakamahia whānuitia ana ngā esters acetic hei:
– He whakarewa i roto i ngā ahumahi waituhi tā, peita, paninga me te horoi ahumahi.
– Ko ētahi rauemi kawe kakara i roto i te umanga kakara me te kakara (me te tino tirotiro kounga).
2. Ahumahi polima me te kirihou
He mahi ā-korekore engari he mahi nui tā te waikawa acetic i roto i te mekameka tuku polymer. Ko ōna hua, inā koa ko te VAM me te acetic anhydride, ka whakamahia hei whakaputa rauemi e whai wāhi ana ki:
– He takai me ngā paninga ngāwari e hiahia ana kia pai te piri.
– Ngā rīpene piri me ngā kāpia ahumahi mō te takai me te hanga.
– Ngā hua kei runga i te PVA e whakamahia ana i roto i ētahi kiriata wairewa-wai (hei tauira, ngā tono takai motuhake me ngā tukanga matū).
Ko te painga o te waikawa acetic i tēnei rāngai ko tōna kaha ki te whakaputa i tētahi monomer me tētahi whakarewa "maha": he ngāwari ki te hanga, he hototahi ki ngā rauemi maha, ā, he rawaka te mahi.
3. Ahumahi kakahu
I roto i ngā kakahu, ka whakamahia te waikawa acetic i roto i ētahi wāhanga o te tukanga whakaputa. Ko tētahi o ōna whakamahinga ko:
– te kaiwhakahaere pH i te wā e tae ana, e whakaoti ana hoki i ngā papanga.
– Mā te tukatuka ka pai ake te ōritetanga o te tae, ka whakahaere hoki i ngā tauhohenga matū kia kore ai e tino kaha ki te muka.
– He wāhanga i roto i te hanga muka cellulose acetate (mā roto i ngā matū waikawa acetic), ka taea te whakamahi mō ngā papanga he āhuatanga motuhake pērā i te pai o te arai me te āhua kanapa.
He mea nui te whakahaere pH i roto i ngā kakahu nā te mea he pai te mahi a te nuinga o ngā tae i roto i tētahi awhe pH motuhake. Nō reira, ka āwhina te waikawa acetic ki te whakapai ake i te kounga o te hua me te whakaiti i ngā hapa hanga.
4. Ahumahi kai me te inu
Ahakoa e mōhiotia whānuitia ana ko te winika kīhini, he mahi nui anō tā te waikawa acetic i roto i te tukatuka kai i runga i te tauine ahumahi. I ngā kukū me ngā paerewa kua whakaritea, ka whakamahia te waikawa acetic hei:
– Ngā matū tiaki me ngā aukati tipu moroiti i roto i ētahi hua.
– He pūwhakahaere waikawa hei pupuri i te reka me te pumau o te hua.
– Ngā kai o te tukanga whakapūkara (te tote/te whakakawa) pērā i te pīkara.
He reka kawa motuhake te waikawa acetic, he āwhina ki te pehi i te tipu o ngā huakita, ā, ka taea te whakaroa i te roa o te oranga o te hua. Heoi, me tutuki i tōna whakamahinga ngā herenga haumaru me ngā ture kai, tae atu ki te parakore me ngā whakaritenga tapanga.
5. Ahumahi rongoā me te matū pai
I roto i te umanga rongoā, ka whakamahia te waikawa acetic me ōna hua pēnei i:
– Ngā tauhohenga i roto i te hanganga o ngā matū hohe me ngā takawaenga.
– te kaiwhakahaere pH i roto i ētahi whakatakotoranga.
– He wāhanga hei hanga i ngā matū acetate (ngā tote acetate) e whakamahia ana i ētahi wā hei whakapiki i te pumau, i te wairewa rānei o ngā rauemi.
Nā te mea he nui te parakore e hiahiatia ana e ngā kamupene rongoā, ko te tikanga ka whakaratohia e ngā kaiwhakarato waikawa acetic ki tēnei rāngai he whakaritenga motuhake (hei tauira, te taumata rongoā) me ngā mana tino pakari ki ngā poke.
6. Ahumahi peita, waituhi me te paninga
Ko te waikawa acetic te mea nui e whakamahia ana mō te hanga o ngā acetate esters (pērā i te ethyl acetate me te butyl acetate), he whakarewa rongonui ēnei. I roto i ngā peita me ngā mangumangu, he mea nui te mahi a ngā whakarewa mō:
– Whakatikatikahia te matotoru kia māmā ai te paninga.
– Whakahaerehia te wā maroke me te hua whakamutunga o te paninga.
– Āwhina i te horapa o ngā tae me ngā tāpiringa.
Ko te painga o ngā whakarewa kei roto i te acetate ko tōna āhua ngāwari ki te huri, ā, he pai mō ngā tukanga ahumahi maha, tae atu ki te tānga takai me ngā paninga ki ngā momo papa rerekē.
7. Te ahumahi horoi me te tukatuka whakarewa
I ētahi kukū, ka taea te whakamahi i te waikawa acetic mō:
– Te tango me te tango i ngā putunga kohuke i runga i ngā taputapu.
– He āwhina ki te whakapūkara māmā, ki te horoi rānei i te mata i mua i te paninga, ahakoa mō ngā tono taumaha ka whakamahia pinepinetia ētahi atu waikawa kaha ake.
– Whakatikatikahia te pH o te otinga tukatuka.
I roto i te tukatuka whakarewa, he mea nui te ma o te mata ki te kounga o ngā paninga, te whakarewa, me ngā maimoatanga e whai ake nei. He kōwhiringa pea te waikawa acetic mō ētahi tono ina he ngāwari te whakahaere i te waikawa waro ki te whakaritea ki ētahi waikawa kohuke, ahakoa me whai tonu i ngā tikanga haumaru me te hauora.
8. Te umanga pūngao me ngā rauemi matatau (ngā tono motuhake)
I ētahi whakamahinga hou, ka whakamahia te waikawa acetic hei:
– Te whakarewa, te reo tauhohenga rānei i roto i te hanganga o ētahi rauemi.
– Ngā rauemi e whakamahia ana mō te hanga i ētahi matū matua mō ngā rauemi whai hua.
Ahakoa kāore pea tōna takoha i te nui pērā i te VAM, i te acetic anhydride rānei, nā te tūranga o te waikawa acetic hei matū taketake, he mea nui tonu i roto i te rauropi rangahau me te hanga rauemi.
9. Te whakaputanga ahumahi me te wātea
I roto i te ahumahi, ko te nuinga o te waikawa acetic ka whakaputaina mā roto i ngā tukanga warohanga methanol whai hua, nui (hei tauira, ngā tukanga Monsanto me Cativa). Nā te pumau o te whakaputanga me ngā utu whakataetae ka wātea te waikawa acetic ki ngā momo rāngai ahumahi. Ka tautokohia hoki e ēnei āhuatanga te whanaketanga o ngā hua whakaputa e whakawhirinaki ana ki ngā tuku waikawa acetic.
10. Ngā āhuatanga haumaru me te whakahaere (K3)
Ahakoa he tino whai hua, he waikura te waikawa acetic kukū, ā, ka pā kino ki te kiri, ki ngā kanohi, me te ara manawa. I roto i te ahumahi, ko te whakahaere tika ko:
– Te whakamahi i ngā PPE (ngā karapu ātete matū, ngā mōhiti tiaki, te whakangungu kanohi mēnā e tika ana).
– Kia pai te hauhautanga me te penapena i roto i ngā ipu e tika ana.
– Ngā tikanga whakahaere turuturu me te whakangungu kaimahi.
– Te tutuki i ngā pepa raraunga haumaru rauemi (SDS/MSDS) me ngā ture taiao.
Ehara i te mea ko te haumaru anake te tiaki i ngā kaimahi, engari ka ārai hoki i te kino o ngā taputapu me ngā whakararuraru i te whakaputanga.
Whakamutunga
He pou nui te waikawa acetic mō te ahumahi hou nā te mea he rauemi matū mata hei whakaputa i ngā momo hua nui, inā koa ko te vinyl acetate monomer, te acetic anhydride, me ngā acetate esters. Ka horapa tōna pānga ki ngā polymers, ngā piripiri, ngā kakahu, ngā kai, ngā rongoā, ngā peita, ngā waituhi, me ngā rauemi motuhake. Nā te mea kua whakapumautia te hanga me te ngāwari o te whakamahinga, ka noho tonu te waikawa acetic hei taonga matū rautaki. Heoi, me taurite ēnei painga nui ki te whakahaere haumaru me te tutuki i ngā paerewa OHS kia pai ai te whai hua, te whai hua, me te kawenga o ngā tukanga ahumahi.
Ki te hiahia koe, ka taea e au te whakarite i tēnei tuhinga kia motuhake ake ki tētahi rāngai (hei tauira, ngā ahumahi kai, kakahu, kāpia/piripiri rānei), ka taea rānei te tāpiri i ngā raraunga ia whakamahinga o te ao me ngā tauira hua tūturu i te mākete Initonīhia.
