Hydroxypropyl Methylcellulose (HPMC)uyeMethyl Hydroxyethyl Cellulose (MHEC)ndiwo maviri emhando dze cellulose ether dzinoshandiswa zvakanyanya dzinobva mu cellulose yechisikigo, polymer inowanikwa mumadziro esero emiti. Makemikari aya anogadziriswa kuburikidza nemaitiro emakemikari kuti agadzire zvinhu zvinoratidza kukora, kuchengetedza mvura, kuumbwa kwefirimu, uye hunhu hwekubatanidza. Kunyange zvazvo vaine hunhu hwakafanana hwekushanda, vanosiyana muchimiro chemakemikari, hunhu, mashandisirwo, uye mashandiro pasi pemamiriro akasiyana-siyana.

1. Kuumbwa kweMakemikoro uye Maumbirwo

HPMC (Hydroxypropyl Methylcellulose)

HPMC imhando ye non-ionic cellulose ether inogadzirwa nekuita cellulose ne methyl chloride ne propylene oxide. Mapoka ehydroxyl (-OH) ari pa cellulose backbone anotsiviwa zvishoma ne methoxy (-OCH₃) uye hydroxypropyl (-CH₂CHOHCH₃).

MHEC (Methyl Hydroxyethyl Cellulose)

Kune rumwe rutivi, MHEC inogadzirwa nekubatanidza cellulose ne ethylene oxide ne methyl chloride. Izvi zvinounza methoxy (-OCH₃) uye hydroxyethyl (-CH₂CH₂OH) mapoka.

Kusiyana Kwakakosha Mumaumbirwo:

HPMC ine zvinhu zvinotsiva hydroxypropyl, nepo MHEC ine mapoka ehydroxyethyl.

Rudzi rweboka re ether runokanganisa hydrophilicity, solubility, uye maitiro ekupisa gelation.

Maitiro eViscosity: HPMC neMHEC zvese zviripo mumhando dzakasiyana dzeviscosity, zvakagadzirirwa mashandisirwo akasiyana. Zvisinei, chimiro chemamorekuru chinokanganisa mashandiro anoita viscosity mumushonga. HPMC inowanzopa thermal gelation iri nani uye viscosity inogara iripo pamusoro pe pH yakafara.

3. Hunhu Hunoshanda

Kuchengetwa kweMvura:

Zvinhu zvose izvi zvinobatsira zvikuru pakuchengetedza mvura, izvo zvakakosha mumasisitimu akavakirwa pasimende negypsum. Zvisinei, HPMC inowanzoita kuti mvura irambe iri nani, zvichiita kuti ive sarudzo inofarirwa mumamortar akaoma, mataira, uye marender.

Mhedzisiro Yokukora:

MHEC inowanzoita kuti mvura irambe yakapfava uye yakasimba, zvichiita kuti ishandiswe zvakanaka kana mvura ichiyerera zvakanaka uye ichishanda zvakanaka.

Kuumbwa Kwemafirimu:

HPMC inowanzogadzira mafirimu anochinjika uye akajeka, nepo MHEC ichigadzira mafirimu akapfava. Kusiyana uku kunokanganisa mashandisirwo ekuputira pamusoro uye zvinonama.

Kupisa kweGelation:

HPMC inoiswa muchimiro chekupisa, zvichiita kuti gel iite seyakapiswa. MHEC inoratidzawo ganda rinopisa, asi zvishoma. Hunhu uhwu hwakakosha zvikuru mumishonga uye chikafu kana paine chinodzivirira kana magadzirirwo ejeli.

4. Mashandisirwo

HPMC neMHEC zvese zvinoshandiswa mumaindasitiri akasiyana-siyana. Zvisinei, mamwe maitiro anoita kuti imwe ive yakakodzera kupfuura imwe pakushandiswa kwakananga.

4.1 Indasitiri yekuvaka

HPMC:

Zvinonamira zvemataira

Mapurasita nemagadzirirwo akavakirwa pa simende

Makomputa anozvienzanisa

Masisitimu ekupedzisa ekudzivirira ekunze (EIFS)

Mapurasita akagadzirwa negypsum

Zvakanakira mukuvaka:

Kuchengetwa kwemvura yakawanda

Nguva iri nani yekuvhura kana uchiisa zvinonamira

Kushanda zvakanaka

MHEC:

Majasi asina mafuta

Purasitiki yakareruka

Zvinonamira zvemadziro

Mishonga yakasanganiswa yakagadzirwa

Zvakanakira mukuvaka:

Kugadzikana kwakapfava

Hunhu hwakanaka hwekunamatira

Maitiro ekusanganisa ari nyore

4.2 Mishonga

HPMC:

Inoshandiswa semushonga wekubatanidza uye wekuvhara firimu mumapiritsi

Masisitimu ekuburitsa mishonga anodzorwa

Madonhwe emaziso uye majeli emaziso

MHEC:

Hazviwanzo shandiswa zvakanyanya nekuda kwehunhu hwayo hwe gelation hushoma, asi zvichiri kushanda mune:

Mishonga inomiswa nemuromo

Mafomu ekushandisa paganda

4.3 Mapendi uye Mapendi

MHEC:

Inowanzo shandiswa mupendi dzakagadzirwa nemvura nekuda kwemaitiro epamusoro epseudoplastic (kucheka-kutetepa)

Inowedzera kukwesha kwebvudzi uye kushandiswa kwakapfava

HPMC:

Inoshandiswawo mumapendi, kunyanya kana mvura yakawanda ichichengetwa kana kuti paine zvinhu zvinoita kuti igare zvakanaka.

D. Sipo dzekuchenesa uye Kutarisirwa Kwemunhu

HPMC:

Mashampoo, maconditioner, uye mafuta ekuzora

Inoshanda sechinosimbisa uye chinosimbisa

MHEC:

Sipo dzemaoko nekugeza muviri

Inonyanya kujeka uye nyore kugadzira

4.4 Indasitiri yezvekudya

HPMC:

Yakatenderwa sechinowedzera chikafu (E464)

Inoshandiswa mumakapisi emuriwo, zvigadzirwa zvebhekari, uye mumasosi akasanganiswa

Inobatsira mukugadzirwa uye kugadzikana

MHEC:

Hazvibvumirwi zvakanyanya kushandiswa kwechikafu; kushandiswa kwacho kwakaganhurirwa.

5. Zvinhu Zvakatipoteredza Nezvemitemo

HPMC neMHEC hazvina chepfu, zvinoora, uye hazvishandisi ionic, zvichiita kuti zvive zvakachengeteka kushandiswa muzvigadzirwa zvakawanda. Zvisinei:

HPMC inotenderwa zvakanyanya kushandiswa mumishonga uye muchikafu.

MHEC inonyanya kushandiswa mumaindasitiri uye muzvishongedzo.

6. Mutengo uye Kuwanikwa

MHEC inowanzo shanda zvishoma pane HPMC nekuda kwemaitiro ayo ekugadzira ari nyore uye kudiwa kwayo kwakaderera mumisika yemishonga neyekudya. Zvisinei, kushandiswa kwakakura kweHPMC, kunyanya mumaindasitiri anotongwa nemutemo, kunoita kuti mutengo wayo wakakwira uve wakakwirira.

Mumasystem anoshanda zvakanyanya akadai sema tile glues kana ma rendering uko mvura yakawanda inochengetwa uye inonamirwa, HPMC ndiyo inosarudzwa. Kusiyana neizvi, kuti zvive nyore kushandisa uye nyore kusanganisa, senge mumajoint compounds kana wall putty, MHEC inogona kushanda zvakanaka.

Panguva iyoHPMCuyeMHECMakemikari akafanana ne cellulose ethers, mapoka avo akasiyana e substituent (hydroxypropyl mu HPMC vs. hydroxyethyl mu MHEC) anotungamira mumisiyano yakakosha mukushanda, kunyanya maererano nekupisa, kuchengetedza mvura, kugadzirwa kwefirimu, uye kuenderana kwekushandiswa.