Focus on Cellulose ethers

Wai-wairewa cellulose ether pärönaki

Wai-wairewa cellulose ether pärönaki

Ko te tikanga honohono, te huarahi me nga ahuatanga o nga momo momo maatete honohono me te ether cellulose wairewa-wai i whakauruhia.Ma te whakarereketanga whakawhiti, ka taea te tino whakapai ake i te viscosity, rheological properties, solubility me te miihini o te wai-wairewa cellulose ether, kia pai ake ai tana mahi tono.E ai ki te hanganga matū me nga ahuatanga o nga hononga whakawhiti rereke, i whakarapopotohia nga momo o nga tauhohenga whakarereketanga o te cellulose ether crosslinking, me nga ahunga whanaketanga o nga hononga whakawhiti rereke i roto i nga waahanga tono o te cellulose ether i whakarapopotohia.I runga i te pai o te mahi o te cellulose ether wairewa-wai i whakarereketia e te hononga whakawhiti me te iti o nga rangahau i te kainga me nga whenua o waho, ko te whakarereketanga whakawhiti hono o te cellulose ether he nui nga tumanakohanga mo te whanaketanga.Ko tenei mo te tohutoro o nga kairangahau whai take me nga umanga whakangao.
Kupu matua: whakawhiti hononga;Ether Cellulose;Hanganga matū;Wairewa;Mahinga tono

Ko te cellulose ether na te pai o tana mahi, hei kaihoko whakakaha, hei pupuri i te wai, hei whakapiri, hei here me te whakamararatanga, hei whakamarumaru i te colloid, hei whakapumau, hei aukati i te aukati, hei whakaemulsifier me te kaihanga kiriata, e whakamahia nuitia ana i roto i te paninga, te hanga, te hinu, te matū o ia ra, te kai. me te rongoa me etahi atu ahumahi.Ko te ether cellulose te nuinga o te methyl cellulose,hydroxyethyl cellulose,carboxymethyl cellulose, ethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose me etahi atu momo etera whakauru.Hangaia te ether cellulose ki te muka miro, ki te muka rakau ranei na roto i te whakamaaramatanga, te etherification, te horoi i te centrifugation, te whakamaroke, te hurihanga o nga mahi kua oti te whakarite, ko te whakamahi i nga kaihoko etherification te whakamahi i te alkane halogenated epoxy alkane ranei.
Heoi, i roto i te tukanga tono o te wai-wairewa cellulose Ether, te tūponotanga ka tūpono ki te taiao motuhake, pērā i te teitei me te iti pāmahana, taiao waikawa-turanga, taiao katote matatini, enei taiao ka meinga te thickening, memehatanga, pupuri wai, adhesion, piri, whakatārewa pūmau me te emulsification o te wai-wairewa cellulose ether e tino pāngia, a ara arahi ki te mate oti o tona taumahinga.
Hei whakapai ake i te mahi tono o te cellulose ether, he mea tika ki te whakahaere i te maimoatanga whakawhiti, ma te whakamahi i nga momo rereke rereke, he rereke nga mahi hua.I runga i te rangahau o nga momo momo kaihoko whakawhiti me o raatau tikanga whakawhiti, me te hangarau whakawhiti i roto i te tukanga whakaputa ahumahi, ko tenei pepa e korero ana mo te whakawhitinga o te cellulose ether me nga momo rereke rereke, e whakarato ana i te tohutoro mo te whakarereketanga whakawhiti o te cellulose ether. .

1.Te hanganga me te maapono whakawhiti o te etera cellulose

Ether Cellulosehe momo pärönaki cellulose, he mea whakahiatohia e te tauhohenga whakakapinga etera o nga roopu hydroxyl waipiro e toru i runga i nga ngota ngota cellulose taiao me te alkane hauota, te alkane epoxide ranei.Na te rereketanga o nga mea whakakapi, he rereke te hanganga me nga ahuatanga o te cellulose ether.Ko te tauhohenga whakawhiti o te cellulose ether te nuinga ka uru ki te etherification, ki te esterification ranei o te -OH (OH i runga i te mowhiti wae huka, te -OH ranei i runga i te whakakapi, i te carboxyl ranei i runga i te whakakapi) me te kaihoko whakawhiti me nga roopu mahi-rua, maha ranei, kia rua. he maha atu ranei nga ngota ngota etera cellulose e hono tahi ana ki te hanga i te hanganga whatunga mokowā maha.Ko te ether cellulose hono-whakawhiti.
I te nuinga o te korero, ko te cellulose ether me te kaihoko whakawhiti o te wairewa wai kei roto he nui ake -OH penei i te HEC, HPMC, HEMC, MC me te CMC ka taea te whakahiato, te honohono whakawhiti ranei.Na te mea kei roto i te CMC nga katote waikawa carboxylic, ko nga roopu mahi i roto i te kaihoko whakawhiti ka taea te esterified hono whakawhiti ki nga katote waikawa carboxylic.
I muri i te tauhohenga o -OH ranei -COO- i roto i te ngota ngota eter cellulose me te kaihoko whakawhiti, na te whakahekenga o te ihirangi o nga roopu wairewa-wai me te hanganga o te hanganga whatunga maha-ahu i roto i te otinga, tona whakarewatanga, te rheology me nga taonga miihini. ka hurihia.Ma te whakamahi i nga momo hononga honohono rereke ki te tauhohe ki te cellulose ether, ka pai ake te mahi o te tono cellulose ether.Ko te Ether Cellulose e tika ana mo te tono ahumahi i whakaritea.

2. Nga momo o nga kaihoko whakawhiti

2.1 He maatete honohono Aldehydes
Ko nga kaihoko honohono Aldehyde e tohu ana ki nga pūhui waro kei roto te roopu aldehyde (-CHO), he matū matū ka taea te tauhohe ki te hauwai, te haukini, te amide me etahi atu pūhui.Ko nga kaihoko honohono Aldehyde e whakamahia ana mo te cellulose me ona hua ko te formaldehyde, te glyoxal, te glutaraldehyde, te glyceraldehyde, me etahi atu. Ka taea e te roopu Aldehyde te urupare ki te rua -OH ki te hanga acetals i raro i nga tikanga waikawa ngoikore, a ka hoki te tauhohenga.Ko nga ethers cellulose noa i whakarerekehia e nga kaihoko whakawhiti aldehydes he HEC, HPMC, HEMC, MC, CMC me etahi atu etera cellulose wai.
Ko te roopu aldehyde kotahi ka honoa ki nga roopu hydroxyl e rua i runga i te mekameka ngota ngota cellulose ether, ka hono nga ngota ngota eter cellulose na roto i te hanganga o nga acetals, ka hanga he hanganga mokowā whatunga, kia huri ai te whakarewatanga.Na te kore utu -OH tauhohenga i waenga i te kaihoko whakawhiti aldehyde me te cellulose ether, ka whakahekehia te nui o nga roopu hydrophilic molecular, ka hua he ngoikore te wairewa o te hua.Na reira, ma te whakahaere i te nui o te kaihoko whakawhiti, ka taea e te whakawhitinga ngawari o te cellulose ether te whakaroa i te wa whakamakuku me te aukati i te hua kia kore e tere rawa te rewa i roto i te wairewa wai, ka hua mai te agglomeration o te rohe.
Ko te kaha o te whakahiatotanga o te aldehyde cellulose ether te tikanga e whakawhirinaki ana ki te nui o te aldehyde, te pH, te riterite o te tauhohenga honohono, te wa hono, me te pāmahana.Ko te teitei rawa, te iti rawa ranei o te pāmahana whitiwhiti me te pH ka kore e taea te huri i te hononga whakawhiti na te hemiacetal ki te acetal, ka puta ki te cellulose ether ka kore e rewa ki te wai.Ko te nui o te aldehyde me te taurite o te tauhohenga honohono ka pa tika ki te tohu whakawhiti o te cellulose ether.
He iti ake te whakamahi o Formaldehyde mo te whakawhiti i te cellulose ether na te nui o te paitini me te pähekeheke.I nga wa o mua, he maha ake te whakamahi i te formaldehyde i roto i te waahi o te paninga, te whakapiri, te kakano, a inaianei kua whakakapihia e te hunga iti-paitini kore-formaldehyde whakawhiti hononga.He pai ake te hononga whakawhiti o te glutaraldehyde i tera o te glyoxal, engari he tino kaha te kakara o te glutaraldehyde, me te utu nui o te glutaraldehyde.I roto i te whakaaro nui, i roto i te ahumahi, ka whakamahia te glyoxal ki te whakawhiti-hono i te wai-wairewa cellulose ether hei whakapai ake i te whakarewatanga o nga hua.Ko te tikanga i te pāmahana rūma, pH 5 ~ 7 ka taea te kawe i nga tikanga waikawa ngoikore ki te tauhohenga whakawhiti.I muri i te whakawhiti, ka roa ake te wa whakamakuku me te wa whakamahana o te cellulose ether, ka ngoikore te ahuatanga o te agglomeration.Ki te whakatauritea ki nga hua kore-whakawhitiwhiti, he pai ake te whakarewatanga o te cellulose ether, a, karekau he hua kore-kore i roto i te otinga, he pai ki te tono ahumahi.I te wa i taka ai a Zhang Shuangjian i te hydroxypropyl methyl cellulose, ka maputia te kaihoko whakawhiti i te glyoxal i mua i te whakamaroke ki te tiki i te hydroxypropyl methyl cellulose inamata me te marara o te 100%, kaore i piri tahi i te wa e rewa ana, a, he tere te marara me te whakakorenga, i whakaoti te paihere i roto i te mahi. tono me te whakawhānui i te mara tono.
I roto i te ahua kawakore, ka pakaru te tukanga whakahuri o te hanga acetal, ka whakapotohia te wa whakamakuku o te hua, a ka whakahokia mai nga ahuatanga whakakorenga o te cellulose ether me te kore he hononga whakawhiti.I te wa o te whakarite me te hanga o te cellulose ether, ko te tauhohenga whakawhiti o te aldehydes i te nuinga o te wa ka mahia i muri i te tukanga tauhohenga etheration, ahakoa i roto i te waahanga wai o te horoi horoi, i te waahanga totoka ranei i muri i te centrifugation.Ko te tikanga, i roto i te horoi horoi, he pai te tauhohenga tauhohenga whakawhiti, engari he kino te paanga o te whakawhiti.Heoi, na te herenga o nga taputapu miihini, he kino te riterite o te hononga-whakawhitinga i roto i te wahanga totoka, engari he pai ake te hononga-whakawhitinga, he iti noa te nui o te kaihoko whakawhiti.
Ko nga kaihoko whakawhiti Aldehydes i whakarereke i te wai-wairewa cellulose ether, i tua atu i te whakapai ake i tona whakarewatanga, he purongo ano ka taea te whakamahi hei whakapai ake i ona ahuatanga miihini, te pumau o te pokey me etahi atu taonga.Hei tauira, i whakamahia e Peng Zhang te glyoxal ki te hono ki te HEC, me te tirotiro i te awe o te kukū o te kaihoko hononga, te pH hono me te pāmahana whakawhiti i runga i te kaha maku o HEC.Ko nga hua e whakaatu ana i raro i te ahua pai o te whakawhitinga, ko te kaha makuku o te muka HEC i muri i te whakawhitinga ka piki ake i te 41.5%, a ka tino pai ake tana mahi.I whakamahia e Zhang Jin te wai-wairewa phenolic resin, glutaraldehyde me te trichloroacetaldehyde ki te whakawhiti CMC.Ma te whakatairite i nga taonga, ko te otinga o te wai-wairewa phenolic resin crosslinked CMC he iti rawa te whakahekenga pokey i muri i te maimoatanga o te pāmahana teitei, ara, ko te pai rawa atu o te parenga pāmahana.
2.2 Waahanga warowaihā nga kaihoko honohono
Ko nga kaihoko honohono waikawa warowaihā e tohu ana ki nga pūhui waikawa polycarboxylic, ko te nuinga ko te waikawa succinic, te waikawa malic, te waikawa tartaric, te waikawa citric me etahi atu waikawa rua, polycarboxylic ranei.I whakamahia tuatahi nga hononga whakawhiti waikawa warowaihā ki te whakawhiti i nga muka papanga hei whakapai ake i te maeneene.Ko te tikanga honohono e whai ake nei: ka tauhohe te roopu carboxyl me te roopu hydroxyl o te ngota ngota cellulose ki te whakaputa esterified cellulose ether.Welch me Yang et al.ko ratou te hunga tuatahi ki te ako i te tikanga honohono o nga hononga whakawhiti waikawa carboxylic.Ko te tikanga whakawhiti e whai ake nei: i raro i etahi ahuatanga, ko nga roopu waikawa carboxylic e rua e tata ana i roto i nga hononga whakawhiti waikawa carboxylic i te tuatahi ka maroke ki te hanga i te anhydride cyclic, a ka tauhohe te anhydride ki te OH i roto i nga ngota ngota cellulose ki te hanga i te etera cellulose honohono me te hanganga mokowā whatunga.
Ko te nuinga o nga wa ka tauhohe nga kaihoko honohono waikawa waro ki te cellulose ether kei roto nga whakakapi hydroxyl.Na te mea he wairewa te wai-wai-wai-waa-waa-waakawa, he kore-paitini, kua whakamahia nuitia ki te ako i te rakau, te maaka, te chitosan me te cellulose i nga tau tata nei.
Ko nga pärönaki me etahi atu polymer esterification taiao whakawhiti whakawhiti, kia pai ake ai te mahi o tana mara tono.
Hu Hanchang et al.whakamahia te konutai hypophosphite whakakōkī ki te tango i wha waikawa polycarboxylic ki te hanganga rāpoi rerekē: Propane tricarboxylic acid (PCA), 1,2,3, 4-butane tetracarboxylic acid (BTCA), cis-CPTA, cis-CHHA (Cis-ChHA) i whakamahia ki te whakaoti i nga papanga miro.Ko nga hua i whakaatu ko te hanganga porohita o te waikawa polycarboxylic whakaoti papanga miro he pai ake te mahi whakaora reko.Ko nga ngota ngota ngota waikawa polycarboxylic patakataka he maatete honohono whaihua na te mea he nui ake te pakari me te pai ake o te hononga whakawhiti atu i nga ngota ngota ngota ngota waikawa warohiko.
Wang Jiwei et al.i whakamahia te waikawa hanumi o te waikawa citric me te anhydride acetic ki te hanga esterification me te whakawhiti whakawhiti i te māngaro.Na roto i te whakamatautau i nga ahuatanga o te taumira wai me te whakapiri maramara, i whakatau ratou he pai ake te whakamaroke o te maaka hono-whakawhiti, he pai ake te pumau o te whakatio-whakarewa, te iti ake o te marama o te whakapiri me te pai ake o te waiariki pokey atu i te maaka.
Ka taea e nga roopu waikawa carboxylic te whakapai ake i to ratau whakarewatanga, te koiora me nga taonga miihini i muri i te whakamaaramatanga whakawhiti hononga ki te hohe -OH i roto i nga momo polymers, me nga pūhui waikawa carboxylic he mea kore-paitini, he iti-paitini ranei, he nui nga tirohanga mo te whakarereketanga whakawhiti o te wai- Ether cellulose whakarewa i roto i te karaehe kai, te karaehe rongoa me nga waahi paninga.
2.3 He maataki hono honohono puhui epoxy
Epoxy crosslinking agent e rua, neke atu ranei nga roopu epoxy, he puhui epoxy kei roto nga roopu mahi kaha.I raro i te mahi a te whakakorikori, ka tauhohe nga roopu epoxy me nga roopu mahi me te -OH i roto i nga puhui waro hei whakaputa macromolecules me te hanganga whatunga.Na reira, ka taea te whakamahi mo te honohono o te cellulose ether.
Ka taea te whakapai ake i te pokey me nga ahuatanga miihini o te cellulose ether ma te hono whakawhiti epoxy.I whakamahia tuatahi te Epoxide ki te hamani i nga muka papanga me te whakaatu i te pai o te whakaotinga.Heoi, he iti noa nga purongo mo te whakarereketanga honohono o te cellulose ether na te epoxides.I whakawhanakehia e Hu Cheng et al he hononga honohono hou epoxy multifunctional hou: EPTA, i pai ake te koki whakaora rapa makuku o nga papanga hiraka tuturu mai i te 200º i mua i te maimoatanga ki te 280º.I tua atu, ko te utu pai o te hononga whakawhiti i tino piki ake te tere o te tae me te tere o te whakauru o nga papanga hiraka tuuturu ki nga waikano waikawa.Ko te epoxy compound crosslinking agent e whakamahia ana e Chen Xiaohui et al.: Ko te polyethylene glycol diglycidyl ether (PGDE) kua honoa ki te gelatin.Whai muri i te honohono, he pai rawa te mahi whakaora rapa a gelatin hydrogel, me te reiti whakaora elastic teitei ake ki te 98.03%.I runga i nga rangahau mo te whakarereketanga honohono o nga polymers taiao penei i te papanga me te gelatin e nga waikura pokapū i roto i nga tuhinga, ko te whakarereketanga honohono o te cellulose ether me te epoxides he tino tumanako.
Ko te Epichlorohydrin (e mohiotia ana ano ko te epichlorohydrin) he kaihoko honohono e whakamahia ana mo te maimoatanga o nga rawa polymer taiao kei roto -OH, -NH2 me etahi atu roopu kaha.Whai muri i te honohono o te epichlorohydrin, ka pai ake te viscosity, acid and alkali resistance, te parenga mahana, te parenga tote, te kutikuti me nga ahuatanga miihini o te rauemi.No reira, ko te tono o te epichlorohydrin i roto i nga hononga whakawhiti cellulose ether he nui te hiranga rangahau.Hei tauira, i hanga e Su Maoyao tetahi rawa whakangao nui ma te whakamahi i te CMC honohono epiclorohydrin.I korerohia e ia te awe o te hanganga rawa, te tohu whakakapinga me te tohu o te whakawhiti i runga i nga ahuatanga whakauru, a ka kitea ko te uara pupuri wai (WRV) me te uara pupuri tote (SRV) o te hua i hangaia me te 3% te kaihoko whakawhiti i piki ake e 26 nga wa me te 17 nga wa, ia.I a Ding Changguang et al.kua whakaritea te carboxymethyl cellulose tino viscous, i tapirihia te epichlorohydrin i muri i te whakaetherification mo te honohono.Ma te whakataurite, ko te viscosity o te hua whakawhiti kua eke ki te 51% teitei ake i tera o te hua kore-whakawhiti.
2.4 Nga kaihoko honohono waikawa Boric
Ko te nuinga o nga kaihoko honohono Boric ko te waikawa boric, te borax, te borate, te organoborate me etahi atu matū honohono kei roto i te borate.Ko te tikanga honohono ko te waikawa boric (H3BO3) me te borate (B4O72-) ka hanga tetrahydroxy borate katote (B(OH)4-) i roto i te wairewa, ka maroke me te -Oh i roto i te pūhui.Hangaia he pūhui hono whakawhiti me te hanganga whatunga.
Ko nga hononga whakawhiti waikawa Boric e whakamahia nuitia ana hei awhina i roto i te rongoa, te karaihe, te raima, te hinu me etahi atu mara.Ka pai ake te kaha o te miihini o nga mea kua rongoahia ki te waikawa boric acid crosslinking agent, a ka taea te whakamahi mo te whakawhiti o te cellulose ether, kia pai ake ai tana mahi.
I te tekau tau atu i 1960, ko te boron pararopi (borax, waikawa boric me te konutai tetraborate, me etahi atu) te kaihoko whakawhiti matua e whakamahia ana i roto i te wai-a-wai-a-te-wai-a-waa te whakawhanaketanga o te wai pakaru o nga mara hinu me te hau.Ko Borax te kaihoko honohono tuatahi i whakamahia.Na nga ngoikoretanga o te boron pararopi, penei i te wa poto o te whakawhiti hononga me te ngoikore o te pāmahana, kua noho te whanaketanga o te kaihoko whakawhiti organoboron hei waahi rangahau.I timata te rangahau o te organoboron i nga tau 1990.Nā ki ona āhuatanga o te teitei ātete pāmahana, ngāwari ki te wahi i kāpia, controllable whakaroa crosslinking, etc, kua tutuki organoboron pānga tono pai i roto i te hinu me te hau mara whati.Liu Ji et al.i whakawhanakehia he kaihoko polymer crosslinking kei roto te roopu waikawa phenylboric, te kaihoko whakawhiti i konatunatua ki te waikawa kiriaku me te polyol polymer me te hohenga roopu ester succinimide, he pai te mahi matawhānui o te whakapiri koiora, ka taea te whakaatu i te pai o te piri me nga taonga miihini i roto i te taiao makuku, a ka taea adhesion ngawari ake.Yang Yang et al.i whakaputahia he kaihoko whakawhiti hononga zirconium boron teitei, i whakamahia hei whakawhiti i te wai turanga o te guanidine gel o te wai pakaru, me te whakapai ake i te pāmahana me te kutikuti o te wai pakaru i muri i te maimoatanga whakawhiti.Kua panuitia te whakarereketanga o te carboxymethyl cellulose ether na roto i te waikawa boric acid crosslinking agent i roto i te wai keri hinu.Na tona hanganga motuhake, ka taea te whakamahi i te rongoa me te hanga
Te honohono o te cellulose ether i roto i te hanga, te paninga me etahi atu mara.
2.5 He kaihoko whakawhiti Phosphide
Ko nga kaihoko whakawhiti Phosphates ko te phosphorus trichloroxy (phosphoacyl chloride), te konutai trimetaphosphate, te konutai tripolyphosphate, me etahi atu. .
Ko te kaihoko whakawhiti Phosphide na te kore-paitini, te iti ranei o te paitini, e whakamahia nuitia ana i roto i te kai, te whakarereketanga o nga rauemi polymer rongoa, penei i te maaka, te chitosan me etahi atu maimoatanga whakawhiti polymer taiao.Ko nga hua e whakaatu ana ka taea te whakarereke i nga ahuatanga o te gelatinization me te pupuhi o te maaka ma te taapiri i te iti o te kaihoko whakawhiti phosphide.I muri i te whakawhitinga o te maaka, ka piki ake te wera o te gelatinization, ka pai ake te pumau o te whakapiri, ka pai ake te kaha o te waikawa i te maaka taketake, me te kaha o te kiriata.
He maha ano nga rangahau mo te honohono chitosan me te kaihoko whakawhiti phosphide, ka taea te whakapai ake i tona kaha miihini, te pumau matū me etahi atu taonga.I tenei wa, kaore he korero mo te whakamahinga o te kaihoko whakawhiti phosphide mo te maimoatanga whakawhitinga ether cellulose.Na te mea he nui ake te kaha o te etera cellulose me te maaka, te chitosan me etahi atu polymers taiao -OH, me te kaihoko whakawhiti phosphide he kore-paitini, he iti ranei nga ahuatanga o te tinana, ko tana tono i roto i te rangahau whakawhiti i te cellulose etera ka whai hua ano pea.Pērā i te CMC whakamahia i roto i te kai, toothpaste mara kōeke ki phosphide crosslinking kaihoko whakarerekētanga, e taea te whakapai ake tona thickening, āhuatanga rheological.MC, HPMC me HEC whakamahia i roto i te mara o te rongoa ka taea te whakapai ake e te kaihoko whakawhiti phosphide.
2.6 Ētahi atu kaihoko hononga whakawhiti
Ko nga aldehydes, epoxides me te cellulose ether crosslinking no te etherification crosslinking, carboxylic acid, boric acid and phosphide crosslinking agent no te esterification crosslinking.I tua atu, ko nga kaihoko whakawhiti e whakamahia ana mo te cellulose ether crosslinking kei roto ano hoki nga pūhui isocyanate, hauota hydroxymethyl pūhui, pūhui sulfhydryl, matū whakawhiti whakarewa whakarewa, organosilicon crosslinking agents, me etahi atu. he ngawari ki te tauhohe me te -OH, a ka taea te hanga i te hanganga whatunga ahu-maha i muri i te honohono.Ko nga ahuatanga o nga hua whakawhiti e pa ana ki te momo o te kaihoko whakawhiti, te tohu whakawhiti me nga tikanga whakawhiti.
Badit · Pabin · Condu et al.i whakamahia te toluene diisocyanate (TDI) hei whakawhiti i te methyl cellulose.I muri i te whakawhitinga, ka piki ake te pāmahana whakawhiti karaihe (Tg) me te pikinga o te paheketanga o te TDI, a ka pai ake te pumau o tana wairewa wai.Kei te whakamahia hoki te TDI mo te whakarereketanga whakawhiti i roto i nga whakapiri, paninga me etahi atu mara.I muri i te whakarereketanga, ka pai ake nga taonga taapiri, te aukati i te pāmahana me te aukati wai o te kiriata.Na reira, ka taea e TDI te whakapai ake i te mahi o te cellulose ether e whakamahia ana i roto i te hangahanga, te paninga me te whakapiri ma te whakawhiti whakawhiti.
Kei te whakamahia whanuitia te hangarau honohono disulfide i roto i te whakarereketanga o nga rawa rongoa me etahi uara rangahau mo te honohono o nga hua cellulose ether i roto i te mara rongoa.Shu Shujun et al.i honoa te β-cyclodextrin me te moroiti silica, te chitosan mercaptoylated me te glucan i roto i te paparanga anga rōnaki, me te tango i nga microspheres silica ki te whiwhi nanocapses hono-whakawhitinga disulfide, he pai te pai o te whakapumautanga o te pH whaiaroaro.
Ko te nuinga o nga katote whakarewa whakarewa ko te nuinga o nga katote whakarewa nui penei i te Zr(IV), Al(III), Ti(IV), Cr(III) me Fe(III).Ko nga katote whakarewa teitei ka polymerized hei hanga i nga katote piriti hydroxyl maha-karihi na roto i te hydration, hydrolysis me te piriti hydroxyl.E whakaponohia ana ko te hononga-whakawhitinga o nga katote konganuku teitei-whare na roto i nga katote piriti hydroxyl maha-nucleated, he ngawari ki te whakakotahi me nga roopu waikawa warowaihā ki te hanga i nga polymers hanganga mokowā maha.Xu Kai et al.i akohia nga ahuatanga rheological o Zr(IV), Al(III), Ti(IV), Cr(III) me Fe(III) raupapa whakarewa utu nui-whakawhitinga carboxymethyl hydroxypropyl cellulose (CMHPC) me te pumau o te waiariki, te mate filtration , te kaha o te onepu kua whakatarewahia, te toenga pakaru kapia me te hototahi o te tote i muri i te tono.Ko nga hua i whakaatu mai, Ko te hononga whakawhiti whakarewa nga taonga e hiahiatia ana mo te kaihoko cimenting o te wai pakaru o te puna hinu.

3. Te whakapai ake i nga mahi me te whakawhanaketanga hangarau o te cellulose ether ma te whakarereketanga whakawhiti

3.1 Te peita me te hanga
He nui ake te whakamahi i te Ether Cellulose HEC, HPMC, HEMC me te MC i roto i te waahi o te hanga, te paninga, me whai pai tenei momo etera cellulose ki te wai, te matotoru, te tote me te paanga o te wera, te aukati kutikuti, he maha nga wa e whakamahia ana i roto i te raima sima, te peita taherapa. , whakapiri tira uku, peita pakitara o waho, lacquer me etahi atu.Na te mea o te whare, ko nga whakaritenga o te mara whakakikorua o nga rauemi me whai kaha miihini pai me te pumau, ko te nuinga o te waa whiriwhiri i te momo etherification crosslinking kaihoko ki te cellulose ether crosslinking whakarerekētanga, penei i te whakamahi o te epoxy halogenated alkane, boric acid crosslinking agent mo tona whakawhitinga, ka taea te whakapai ake i te hua. te pokey, te tote me te pāmahana parenga, te parenga kutikuti me nga taonga miihini.
3.2 Nga mara rongoa, kai me nga matū o ia ra
Ko te MC, HPMC me te CMC i roto i te wai-wairewa cellulose etera he maha nga wa e whakamahia ana i roto i nga taonga paninga ho'oraa, tāpiritanga puhoi-tuku ho'oraa me te thickener ho'oraa wai me te whakaemulsion stabilizer.Ka taea hoki te whakamahi CMC hei emulsifier me te whakapakeke i roto i te miraka pē, hua miraka me te toothpaste.Ka whakamahia te HEC me te MC i roto i te mara matū o ia ra ki te matotoru, te whakamarara me te whakakotahi.No te mea ko te mara o te rongoa, kai me te karaehe matū o ia ra e hiahia ana ki nga rauemi haumaru me te kore-paitini, no reira, mo tenei momo cellulose ether ka taea te whakamahi waikawa phosphoric, waikawa carboxylic crosslinking agent, sulfhydryl crosslinking agent, etc., i muri i te whakarereketanga whakawhiti, ka taea whakapai ake i te pokey o te hua, te pumau o te koiora me etahi atu taonga.
He iti noa te whakamahi i te HEC i roto i nga mara rongoa me nga kai, engari na te mea ko te HEC he katote cellulose ether me te kaha o te whakarewatanga, kei a ia nga painga motuhake mo te MC, HPMC me te CMC.I te wa kei te heke mai, ka whakawhitihia e nga kaihoko whakawhiti haumaru me te kore paitini, ka nui te kaha o te whakawhanaketanga i roto i nga waahi rongoa me te kai.
3.3 Te keri hinu me nga waahi whakaputa
Ko te CMC me te carboxylated cellulose ether e whakamahia ana hei kaihoko maimoatanga paru keri ahumahi, he kaihoko mate wai, he kaihoko matotoru hei whakamahi.Ka rite ki te ether cellulose kore-katote, HEC te whakamahia whānuitia i roto i te mara o te keri hinu na te mea he pai te whakakaha o te kaha, te kaha o te whakatārewatanga o te kirikiri me te pumau, te aukati wera, te tote teitei, te aukati paipa iti, te iti o te wai, te rapa tere. pakaru me te toenga iti.I tenei wa, he nui ake nga rangahau ko te whakamahi i te waikawa boric crosslinking agents me te whakarewa crosslinking agents ki te whakarereke i te CMC e whakamahia ana i roto i te waahi keri hinu, karekau-katoto cellulose ether crosslinking rangahau whakarerekētanga rangahau he iti ake, engari ko te whakarereketanga hydrophobic o te kore-ionic cellulose ether, e whakaatu ana i te nui. pokey, pāmahana me te tote ātete me te kutikuti pūmautanga, marara pai me te ātete ki te waiwai koiora.I muri i te whakawhitihia e te waikawa boric, te whakarewa, te epoxide, te epoxy halogenated alkanes me etahi atu kaihoko whakawhiti, ko te cellulose ether i whakamahia i roto i te keri hinu me te whakaputa kua pai ake te matotoru, te tote me te atete ki te pāmahana, te pumau me era atu, he pai te tono ki te heke mai.
3.4 Ētahi atu mara
Cellulose ether na te matotoru, te emulsification, te hanga kiriata, te whakamarumaru colloidal, te pupuri makuku, te adhesion, te anti-sensitivity me etahi atu mea tino pai, he nui ake te whakamahi, hei taapiri atu ki nga mara o runga ake nei, i whakamahia ano hoki ki te hanga pepa, karamu, te kakano me te tae, tauhohenga polymerization me etahi atu mara.E ai ki nga whakaritenga o nga rawa taonga i roto i nga waahi rereke, ka taea te whakamahi i nga kaihoko whakawhiti rereke mo te whakarereketanga whakawhiti ki te whakatutuki i nga whakaritenga tono.I te nuinga o te waa, ka taea te wehewehea te eter cellulose hono ki nga waahanga e rua: ether cellulose ether me te eter cellulose estered.Ka tauhohe nga Aldehydes, epoxides me etahi atu hononga whakawhiti ki te -Oh i runga i te cellulose ether ki te hanga i te here eter-oxygen (-O-), no nga hononga whakawhiti etherification.Ka tauhohe te waikawa warowairaka, te phosphide, te waikawa boric me etahi atu matū honohono ki te -OH i runga i te cellulose ether ki te hanga i nga here ester, no nga kaihoko whakawhiti esterification.Ko te roopu carboxyl i roto i te CMC ka tauhohe ki te -OH i roto i te kaihoko honohono ki te whakaputa esterified crosslinked cellulose ether.I tenei wa, he iti noa nga rangahau mo tenei momo whakarereketanga honohono, a he waahi tonu hei whakawhanaketanga mo nga ra kei mua.Na te mea he pai ake te pumau o te here ether i tera o te here ester, he kaha ake te pumau o te ether cellulose ether me nga taonga miihini.E ai ki nga waahanga tono rereke, ka taea te whiriwhiri i te kaihoko whakawhiti tika mo te whakarereketanga o te cellulose ether crosslinking, kia whiwhi hua e tutuki ai nga hiahia o te tono.

4. Whakamutunga

I tenei wa, ka whakamahia e te ahumahi te glyoxal ki te whakawhiti i te cellulose ether, hei whakaroa i te wa rewa, hei whakaoti i te raru o te whakakao hua i te wa e rewa ana.Ka taea e te Glyoxal crosslinked cellulose ether te huri noa i tana whakarewatanga, engari karekau he whakapai ake i etahi atu taonga.I tenei wa, ko te whakamahi i etahi atu matū whakawhiti i tua atu i te glyoxal mo te whakawhiti i te cellulose ether he uaua ki te ako.Na te mea kei te whakamahia whanuitia te cellulose ether i roto i te keri hinu, te hanga, te paninga, te kai, te rongoa me etahi atu ahumahi, ko te whakarewatanga, te rheology, nga taonga miihini he mahi nui ki tana tono.Ma te whakarereketanga whakawhiti, ka taea e ia te whakapai ake i tana mahi tono i roto i nga momo mara, kia tutuki ai nga hiahia tono.Hei tauira, ko te waikawa carboxylic, te waikawa phosphoric, te waikawa boric crosslinking agent mo te cellulose ether esterification ka taea te whakapai ake i tana mahi tono mo te kai me te rongoa.Heoi, kare e taea te whakamahi i te aldehydes i roto i te umanga kai me te rongoa na te mea he paitini tinana.Ko te waikawa Boric me nga kaihoko whakawhiti whakarewa he awhina ki te whakapai ake i te mahi o te wai pakaru hinu me te hau i muri i te whakawhiti i te etera cellulose e whakamahia ana i roto i te keri hinu.Ka taea e etahi atu maatete honohono alkyl, penei i te epichlorohydrin, te whakapai ake i te viscosity, nga ahuatanga rheological me nga taonga miihini o te cellulose ether.Na te whanaketanga tonu o te aoiao me te hangarau, kei te pai haere tonu nga whakaritenga o nga momo umanga mo nga rawa rawa.Hei whakatutuki i nga whakaritenga mahi o te cellulose ether i roto i nga momo waahanga tono, ko nga rangahau mo nga ra kei te heke mai mo te honohono cellulose ether he nui nga tirohanga mo te whanaketanga.


Te wa tuku: Hanuere-07-2023
WhatsApp Chat Online!