Kusimba kwe cellulose ether

Cellulose ethersiboka remapolymers akasiyana-siyana anoshandiswa zvakanyanya mumaindasitiri akasiyana-siyana nekuda kwehunhu hwawo hwekukora. Kutanga nekutanga kwe cellulose ethers uye hunhu hwadzo hwemaumbirwo, bepa iri rinoongorora mashandiro ari shure kwehunhu hwadzo hwekukora, richitsanangura kuti kusangana nemamorekuru emvura kunotungamira sei mukuwedzera viscosity. Mhando dzakasiyana dze cellulose ethers dzinokurukurwa, dzinosanganisira methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, uye carboxymethyl cellulose, imwe neimwe ine hunhu hwakasiyana hwekukora. mashandisirwo e cellulose ethers mumaindasitiri akadai sekuvaka, mishonga, chikafu, zvizoro, uye kutarisirwa kwemunhu, zvichiratidza basa razvo rinokosha mukugadzira zvigadzirwa uye maitiro ekugadzira. Chekupedzisira, kukosha kwe cellulose ethers mumaindasitiri emazuva ano kunosimbiswa, pamwe chete netariro dzeramangwana uye kufambira mberi kunogona kuitika mutekinoroji ye cellulose ether.

Cellulose ethers inomiririra boka remapolymers anobva kucellulose, biopolymer inowanikwa munzvimbo dzakawanda mumadziro emasero emiti. Nehunhu hwayo hwe physicochemical hwakasiyana, cellulose ethers dzinoshandiswa zvakanyanya mumaindasitiri akasiyana-siyana, kunyanya nekuda kwekukora kwawo. Kugona kwe cellulose ethers kuwedzera viscosity uye kuvandudza hunhu hwe rheological kunoita kuti dzive dzinokosha mukushandiswa kwakasiyana-siyana kubva pazvinhu zvekuvaka kusvika kumafomu emishonga.

1. Hunhu hweCellulose Ethers

Usati wanyatsoongorora kuti cellulose ethers inokora sei, zvakakosha kuti unzwisise hunhu hwayo. Cellulose ethers inogadzirwa kuburikidza nekuchinja kwemakemikari e cellulose, kunyanya kusanganisira etherification reactions. Mapoka ehydroxyl (-OH) ari mu cellulose backbone anochinjana ne ether groups (-OR), uko R inomiririra zvinhu zvakasiyana-siyana. Kuchinja uku kunotungamira kuchinjwa kwechimiro chemamorekuru uye hunhu hwe cellulose, zvichipa hunhu hwakasiyana kune cellulose ethers.

Kugadziriswa kwemaumbirwo ema cellulose ethers kunokanganisa kunyungudika kwawo, maitiro e rheological, uye hunhu hwekukora. Dhigirii rekutsiva (DS), iro rinoreva huwandu hweavhareji yemapoka ehydroxyl akatsiviwa pachikamu chimwe nechimwe che anhydroglucose, rinoita basa rakakosha pakuona hunhu hwema cellulose ethers. Higher DS inowanzoenderana nekuwedzera kwekunyungudika uye kushanda zvakanaka kwekukora.

2. Nzira dzeKusimba kweMhedzisiro

Kusimba kwemasero emumvura kunoratidzwa nemasero emumvura kunobva mukusangana kwawo nemamorekuru emvura. Kana akapararira mumvura, masero emumvura anonyoroveswa nemvura, umo mamorekuru emvura anoumba hydrogen bonds nemaatomu e-ether oxygen uye mapoka ehydroxyl emaketani epolymer. Maitiro aya ekunyoroveswa mvura anotungamira mukuzvimba kwemasero emumvura uye kuumbwa kwechimiro chenetwork chetatu-dimensional mukati memvura.

Kubatanidzwa kwecheni dze ether dzakanyungudutswa dze cellulose uye kuumbwa kwehydrogen bonds pakati pema polymer molecules kunobatsira mukuwedzera viscosity. Pamusoro pezvo, kudzoserwa kwe electrostatic pakati pemapoka e ether ane charge yakaipa kunobatsirawo mukukora nekudzivirira kusungirirwa kwecheni dze polymer uye kukurudzira kupararira mu solvent.

Maitiro e rheological e cellulose ether solutions anokonzerwa nezvinhu zvakaita se polymer concentration, danho rekutsiva, molecular weight, uye tembiricha. Pa low concentrations, cellulose ether solutions dzinoratidza maitiro e Newton, nepo pa high concentrations, dzinoratidza pseudoplastic kana shear-thinning behavior nekuda kwekukanganiswa kwe polymer entanglements pasi pekumanikidzwa kwe shear.

3. Mhando dzeCellulose Ethers
Cellulose ethers ine mhando dzakasiyana dzezvinogadzirwa, imwe neimwe ichipa hunhu hwakasiyana hwekukora hwakakodzera kushandiswa kwakasiyana-siyana. Mamwe marudzi anowanzoshandiswa ecellulose ethers anosanganisira:

Methyl Cellulose (MC): Methyl cellulose inowanikwa ne etherification ye cellulose ne methyl groups. Inonyungudika mumvura inotonhora uye inoita mhinduro dzinoonekera, dzakasimba. MC ine hunhu hwakanaka hwekuchengetedza mvura uye inowanzoshandiswa sechinokora muzvinhu zvekuvaka, machira, uye zvigadzirwa zvekudya.

Hydroxyethyl Cellulose (HEC): Hydroxyethyl cellulose inogadzirwa

Inosanganiswa nekupinza mapoka ehydroxyethyl pamusana we cellulose. Inonyungudika mumvura inotonhora neinodziya uye inoratidza maitiro epseudoplastic. HEC inoshandiswa zvakanyanya mumishonga, zvigadzirwa zvekuchengetedza muviri, uye sechinokora mupendi dzelatex.

Hydroxypropyl Cellulose (HPC): Hydroxypropyl cellulose inogadzirwa ne etherification ye cellulose ne hydroxypropyl groups. Inonyungudika mumhando dzakasiyana-siyana dze solvents, dzinosanganisira mvura, doro, uye organic solvents. HPC inowanzo shandiswa sechinhu chinosimbisa, chinosunga, uye chinoumba firimu mumishonga, zvizoro, uye ma coatings.

Carboxymethyl Cellulose (CMC): Carboxymethyl cellulose inogadzirwa ne carboxymethylation ye cellulose ine chloroacetic acid kana sodium salt yayo. Inonyungudika zvakanyanya mumvura uye inoumba mhinduro dzakasimba dzine maitiro akanaka epseudoplastic. CMC inoshandiswa zvakanyanya muzvigadzirwa zvekudya, mishonga, machira, uye kugadzira mapepa.

Aya ma cellulose ethers ane hunhu hwakasiyana hwekukora, hunhu hwekunyungudika, uye kuenderana nezvimwe zvinhu, zvichiita kuti akwanise kushandiswa zvakasiyana-siyana mumaindasitiri.

4. Mashandisirwo eCellulose Ethers
Hunhu hwe cellulose ethers hwekukora hunoita kuti dzive dzakakosha mumabasa akasiyana-siyana emaindasitiri. Mamwe mashandisirwo akakosha e cellulose ethers anosanganisira:

Zvinhu Zvokuvaka: Cellulose ethers dzinoshandiswa zvakanyanya sezvinhu zvinowedzerwa nesimende zvakaita sedhaka, grout, uye plaster kuti zvishande zvakanaka, kuchengetedza mvura, uye kunamira. Dzinoshanda senzira dzekugadzirisa rheology, dzichidzivirira kupatsanurwa uye dzichivandudza mashandiro ezvigadzirwa zvekuvaka.

Mishonga: Cellulose ethers inoshandiswa zvakanyanya mumishonga semabinders, disintegrants, uye thickening agents mumapiritsi, makapisiri, suspensions, uye ophthalmic solutions. Inovandudza hunhu hwehupfu, inobatsira kudzvanywa kwepiritsi, uye inodzora kuburitswa kwezvinhu zvinoshanda.

Zvigadzirwa Zvekudya: Cellulose ethers dzinowanzo shandiswa sezvinhu zvinosimbisa, zvinosimbisa, uye zvinogadzira gelling muzvigadzirwa zvakasiyana-siyana zvekudya, zvinosanganisira muto, madhirezi, madhizeti, uye zvigadzirwa zvemukaka. Dzinowedzera magadzirirwo, kunaka, uye kunzwa kwemuromo uku dzichivandudza kugadzikana kwesherufu uye kudzivirira syneresis.

Zvizoro Nekuchengetedza Munhu: Cellulose ethers inoshandiswa muzvizoro nezvigadzirwa zvekuchengetedza munhu zvakaita semakirimu, mafuta ekuzora, mashampoo, uye mushonga wemazino sezvinhu zvinosimbisa, zvinosanganisa mafuta, uye zvinogadzira firimu. Zvinopa hunhu hwakanaka hwerheological, zvinosimudzira kugadzikana kwechigadzirwa, uye zvinopa magadzirirwo akapfava uye akanaka.

Pendi uye Mapendi:Cellulose ethersDzinoshanda senzira dzekugadzirisa rheology mumapendi, machira, uye zvinonamira, dzichivandudza kudzora kupenya, kuramba kudonha, uye kugadzirwa kwefirimu. Dzinobatsira mukugadzikana kwemafomula, kudzivirira kugadzika kwepigment, uye kuwedzera hunhu hwekushandisa.

Kusimba kwe cellulose ethers kunoita basa guru mumabasa akasiyana-siyana emaindasitiri uye mukugadzirwa kwezvigadzirwa. Hunhu hwavo hwakasiyana hwe rheological, kuenderana nezvimwe zvinhu, uye kuora kwehupenyu zvinoita kuti zvive sarudzo dzinofarirwa nevagadziri muzvikamu zvakasiyana-siyana. Sezvo maindasitiri achiramba achikoshesa kuchengetedzeka uye mhinduro dzinochengetedza nharaunda, kudiwa kwe cellulose ethers kunotarisirwa kuwedzera zvakanyanya.