Focus on Cellulose ethers

Dab tsi yog qhov tseem ceeb ntawm HPMC?

HPMC yog dav siv nyob rau hauv cov khoom siv, coatings, hluavtaws resins, ceramics, tshuaj, khoom noj khoom haus, textiles, ua liaj ua teb, tshuaj pleev ib ce, luam yeeb thiab lwm yam lag luam. HPMC tuaj yeem muab faib ua qib kev lag luam, qib zaub mov thiab qib tshuaj raws li daim ntawv thov.

Dab tsi yog qhov ntau npaum li cas ntawm HPMC hauv putty hmoov?

Tus nqi ntawm HPMC siv nyob rau hauv cov ntaub ntawv siv tau cuam tshuam los ntawm huab cua, kub, zoo ntawm cov hmoov tshauv hauv zos, cov mis ntawm putty hmoov thiab qhov zoo ntawm cov neeg siv khoom. Muaj qhov sib txawv ntawm qhov sib txawv, feem ntau hais lus, nws yog nruab nrab ntawm 4-5 kg.

Dab tsi yog qhov tsim nyog viscosity ntawm hydroxypropyl methylcellulose?

Feem ntau, 100,000 putty hmoov yog txaus, thiab qhov yuav tsum tau nyob rau hauv mortar yog siab dua, thiab nws xav tau 150,000 kom yooj yim siv. Ntxiv mus, qhov tseem ceeb tshaj plaws ua haujlwm ntawm HPMC yog dej tuav, ua raws li thickening. Nyob rau hauv cov hmoov nplej, tsuav yog cov dej tuav tau zoo thiab cov viscosity tsawg (7-8), kuj tseem ua tau. Tau kawg, qhov siab dua qhov viscosity, qhov zoo dua qhov txheeb ze dej tuav. Thaum lub viscosity siab tshaj 100,000, lub viscosity tsis cuam tshuam rau cov dej tuav. loj.

Dab tsi yog cov cim qhia tseem ceeb ntawm hydroxypropyl methylcellulose?

Cov ntsiab lus ntawm Hydroxypropyl

Methyl cov ntsiab lus

viscosity

Tshauv

Poob rau ziab

Dab tsi yog cov khoom siv tseem ceeb ntawm hydroxypropyl methylcellulose?

Lub ntsiab raw khoom ntawm HPMC: refined paj rwb, methyl chloride, propylene oxide, lwm yam raw khoom, caustic soda, acid toluene.

Lub luag haujlwm tseem ceeb ntawm kev thov hydroxypropyl methylcellulose hauv cov hmoov nplej yog dab tsi, thiab nws puas tshwm sim tshuaj?

Ntawm cov hmoov putty, nws plays peb lub luag hauj lwm ntawm thickening, dej tuav thiab kev tsim kho. Thickening, cellulose tuaj yeem thicken kom tshem tawm, ua kom cov tshuaj sib txawv nce thiab nqis, thiab tiv thaiv sagging. Kev tuav dej: ua kom cov hmoov putty qhuav maj mam, thiab pab cov hmoov tshauv calcium kom hnov ​​​​mob hauv qab dej. Kev tsim kho: Cellulose muaj cov nyhuv lubricating, uas tuaj yeem ua rau cov hmoov putty muaj kev tsim kho zoo. HPMC tsis koom nrog cov tshuaj tiv thaiv, tab sis tsuas yog ua lub luag haujlwm pabcuam.

Hydroxypropyl methylcellulose yog non-ionic cellulose ether, yog li dab tsi yog non-ionic?

Nyob rau hauv cov nqe lus ntawm layman, inert tshuaj tsis koom nyob rau hauv chemical tshuaj.

CMC (carboxymethyl cellulose) yog cationic cellulose, yog li nws yuav tig mus rau hauv taum curd thaum nws ntsib tshauv calcium.

Lub gel kub ntawm hydroxypropyl methylcellulose cuam tshuam li cas?

Lub gel kub ntawm HPMC muaj feem xyuam rau nws cov ntsiab lus methoxy, qhov qis dua cov ntsiab lus methoxy, qhov siab dua qhov gel.

Puas muaj kev sib raug zoo ntawm kev poob ntawm cov hmoov putty thiab hydroxypropyl methylcellulose?

Muaj kev sib raug zoo! ! ! Nws yog cov dej tsis zoo ntawm HPMC, uas yuav ua rau cov hmoov poob.

Dab tsi yog qhov txawv ntawm cov dej txias tam sim thiab kub soluble hom hydroxypropyl methylcellulose hauv cov txheej txheem tsim khoom?

Cov dej txias tam sim ntawm HPMC yog qhov chaw kho nrog glyoxal, thiab nws tawg sai sai hauv dej txias, tab sis nws tsis yaj tiag tiag. Nws tsuas yog yaj thaum lub viscosity nce. Kub yaj hom tsis nto kho nrog glyoxal. Yog hais tias tus nqi ntawm glyoxal yog loj, dispersion yuav ceev, tab sis lub viscosity yuav nce maj mam, thiab yog hais tias tus nqi yog me me, qhov opposite yuav muaj tseeb.

Dab tsi yog qhov tsw ntawm hydroxypropyl methylcellulose?

HPMC tsim los ntawm txoj kev hnyav siv toluene thiab isopropanol ua cov kuab tshuaj. Yog tias kev ntxhua khaub ncaws tsis zoo, yuav muaj qee qhov tsw ntxhiab tsw. (Neutralization rov qab yog cov txheej txheem tseem ceeb ntawm tsw)

Yuav ua li cas xaiv txoj cai hydroxypropyl methylcellulose?

Putty hmoov: yuav tsum tau ceev dej siab, kev tsim kho yooj yim

Ordinary cement-based mortar: yuav tsum muaj dej tuav, kub ua hauj, thiab instant viscosity (

Daim ntawv thov kev tsim kho cov kua nplaum: cov khoom siv tam sim nrog cov viscosity siab.

Gypsum mortar: siab dej tuav, nruab nrab thiab tsawg viscosity, instant viscosity nce

Dab tsi yog lub npe hu ua 16 hydroxypropyl methylcellulose?

Lub npe hu ua HPMC lossis MHPC alias hypromellose, cellulose hydroxypropyl methyl ether.

Daim ntawv thov ntawm hydroxypropyl methylcellulose nyob rau hauv putty hmoov, yog vim li cas rau cov huab cua npuas nyob rau hauv lub putty hmoov?

Hauv cov hmoov putty, HPMC plays peb lub luag hauj lwm ntawm thickening, dej tuav thiab kev tsim kho. Cov laj thawj rau cov npuas yog:

(1) Ntxiv dej ntau dhau.

(2) Thaum cov txheej hauv qab tsis qhuav, txhuam lwm txheej saum toj, thiab nws yooj yim ua npuas dej.

Dab tsi yog qhov txawv ntawm hydroxypropyl methylcellulose thiab MC:

MC yog methyl cellulose, uas yog ua los ntawm cellulose ether los ntawm kev kho cov paj rwb refined nrog alkali, siv methane chloride ua tus neeg sawv cev etherification, thiab tau txais cov tshuaj tiv thaiv. Feem ntau, qhov degree ntawm kev hloov pauv yog 1.6-2.0, thiab cov solubility sib txawv nrog cov qib sib txawv ntawm kev hloov pauv. Sib txawv, nws belongs rau non-ionic cellulose ether.

(1) Cov dej tuav ntawm methylcellulose nyob ntawm nws cov nyiaj ntxiv, viscosity, particle fineness thiab dissolution tus nqi. Feem ntau, yog tias qhov sib ntxiv yog qhov loj, qhov zoo me me, thiab cov viscosity loj, cov dej tuav tau siab. Ntawm lawv, qhov sib ntxiv muaj qhov cuam tshuam ntau dua rau tib neeg cov dej tuav tus nqi. Lub viscosity tsis yog proportional rau cov dej tuav tus nqi. Tus nqi dissolution feem ntau yog nyob ntawm qhov chaw ntawm cellulose hais. Degree ntawm kev hloov kho thiab particle fineness. Ntawm cov cellulose ethers saum toj no, methyl cellulose thiab hydroxypropyl methyl cellulose muaj cov dej tuav ntau dua.

(2) Methylcellulose yog soluble hauv dej txias, thiab nws yuav nyuaj rau yaj hauv dej kub. Nws cov tshuaj aqueous yog ruaj khov nyob rau hauv thaj tsam ntawm ph = 3-12. Nws muaj kev sib raug zoo nrog cov hmoov txhuv nplej siab, thiab lwm yam thiab ntau surfactants. Thaum qhov kub thiab txias Thaum lub gelation kub mus txog, gelation yuav tshwm sim.

(3) Kev hloov ntawm qhov kub thiab txias yuav cuam tshuam rau cov dej tuav tus nqi ntawm methyl cellulose. Feem ntau, qhov kub thiab txias ntau dua, cov dej khaws cia yuav tsis zoo. Yog hais tias lub mortar kub siab tshaj 40 degrees, cov dej tuav ntawm methyl cellulose yuav txo qis, uas yuav cuam tshuam rau kev tsim kho ntawm mortar.

(4) Methyl cellulose muaj qhov cuam tshuam loj rau kev tsim kho thiab adhesion ntawm mortar. Adhesion ntawm no yog hais txog lub nplaum nplaum ntawm tus neeg ua haujlwm lub cuab yeej applicator thiab phab ntsa substrate, uas yog, shear resistance ntawm lub mortar. Lub adhesiveness yog siab, shear resistance ntawm lub mortar yog loj, thiab lub zog xav tau los ntawm cov neeg ua hauj lwm nyob rau hauv tus txheej txheem ntawm kev siv kuj yog loj, thiab kev tsim kho ntawm lub mortar yog tsis zoo.

Hydroxypropyl methylcellulose muab faib ua ob peb hom, thiab qhov sib txawv ntawm lawv siv yog dab tsi?

HPMC tuaj yeem muab faib ua hom tam sim (lub npe lub npe "S") thiab hom kub yaj. Cov khoom lag luam tam sim no tawg sai sai hauv dej txias thiab ploj mus rau hauv dej. Lub sijhawm no, cov kua dej tsis muaj viscosity vim tias HPMC tsuas yog tawg mus rau hauv dej yam tsis muaj kev sib cais tiag tiag. Txog 2 feeb, qhov viscosity ntawm cov kua yuav maj mam nce, tsim cov pob tshab dawb viscous colloid. Cov khoom kub yaj, thaum ntsib dej txias, tuaj yeem tawg sai sai hauv dej kub thiab ploj mus hauv dej kub. Thaum qhov kub thiab txias poob rau qee qhov kub (raws li gel kub ntawm cov khoom), viscosity yuav maj mam tshwm sim kom txog thaum nws tsim cov pob tshab viscous colloid.

Yuav ua li cas yog cov txheej txheem dissolution ntawm hydroxypropyl methylcellulose?

1) Txhua tus qauv tuaj yeem muab ntxiv rau cov khoom siv los ntawm kev sib xyaw qhuav;

2) Thaum nws yuav tsum tau muab tso ncaj qha mus rau qhov kub thiab txias aqueous tov, nws yog qhov zoo dua los siv cov dej txias dispersion hom, thiab feem ntau nws yuav siv sij hawm 10-90 feeb kom thicken tom qab ntxiv (kib thiab do)

3) Cov qauv zoo tib yam yog nplawm thiab dispersed nrog dej kub ua ntej, ces nws yuav yaj tom qab ntxiv dej txias rau do thiab txias;

4) Yog hais tias agglomeration thiab wrapping tshwm sim thaum lub sij hawm dissolution, nws yog vim hais tias cov stirring tsis txaus los yog cov qauv zoo tib yam yog ncaj qha ntxiv rau cov dej txias. Lub sijhawm no, nws yuav tsum tau stirred sai. tus

5) Yog tias cov npuas raug tsim tawm thaum lub sijhawm tawg, lawv tuaj yeem tso tseg rau 2-12 teev (lub sijhawm tshwj xeeb yog txiav txim siab los ntawm qhov sib xws ntawm cov tshuaj) lossis tshem tawm los ntawm nqus tsev, nias, thiab lwm yam, lossis tus nqi tsim nyog ntawm defoaming tus neeg sawv cev tuaj yeem ntxiv. tus

Yuav ua li cas txiav txim qhov zoo ntawm hydroxypropyl methylcellulose yooj yim thiab intuitively?

1) Whiteness, txawm hais tias dawb tsis tuaj yeem txiav txim siab seb HPMC puas siv tau yooj yim, thiab yog tias cov tshuaj ntxuav hniav dawb ntxiv rau hauv cov txheej txheem tsim khoom, nws yuav cuam tshuam rau nws qhov zoo, tab sis feem ntau ntawm cov khoom zoo muaj cov xim dawb.

2) Fineness: Qhov zoo ntawm HPMC feem ntau muaj 80 mesh thiab 100 mesh, 120 mesh tsawg dua, qhov zoo dua qhov zoo dua.

3) Lub teeb xa hluav taws xob: Tom qab HPMC muab tso rau hauv dej los tsim cov pob tshab colloid, saib nws lub teeb xa hluav taws xob. Qhov loj dua lub teeb xa hluav taws xob, qhov zoo dua, qhia tias muaj tsawg insolubles nyob rau hauv nws, thiab transmittance ntawm ntsug reactors feem ntau zoo. , kab rov tav reactor yog phem dua, tab sis nws tsis tau txhais hais tias qhov zoo ntawm cov ntsug reactor zoo dua li cov kab rov tav reactor, thiab muaj ntau yam los txiav txim seb cov khoom zoo.

4) Lub ntiajteb txawj nqus tshwj xeeb: qhov loj dua qhov tshwj xeeb lub ntiajteb txawj nqus, qhov hnyav dua qhov zoo dua. Qhov siab dua qhov tshwj xeeb lub ntiajteb txawj nqus, qhov siab dua cov ntsiab lus hydroxypropyl hauv cov khoom. Qhov siab dua cov ntsiab lus hydroxypropyl, qhov dej tuav tau zoo dua.


Post lub sij hawm: Nov-24-2022
WhatsApp Online Sib Tham!