Ubwiza bwa Hydroxypropyl Methyl Cellulose

Hydroxypropyl methylcellulose itunganyirizwa mu ipamba nyuma ya alkalisiyasi, ikoresheje okiside ya propylene na methyl chloride nka etherification, kandi ikagira ibisubizo byinshi kugirango itange selile itavanze na selile.Hydroxypropyl methylcellulose ni ether ya ionic selulose ether, yera mumiterere, impumuro nziza kandi itaryoshye.Urwego rwo gusimburwa muri rusange.Imiterere yacyo iratandukanye bitewe nikigereranyo cyibintu bya vitoxyl hamwe na hydroxypropyl.

Ubwa mbere, banza urebe synthesis ya hydroxypropyl methylcellulose:

Cellulose itunganijwe neza ivurwa n'umuti wa alkali kuri 35-40 ° C mugihe cyigice cyisaha, ugakanda, hanyuma selile igasunikwa kuri 35 ° C kandi igasaza neza, kuburyo impuzandengo ya polymerisation ya fibre alkali yabonetse iri muri urwego rukenewe.Shira fibre ya alkali muri tank ya etherification, ongeramo okiside ya propylene na methyl chloride ikurikiranye, etherify kuri 50-80 ° C mumasaha 5, kandi umuvuduko ntarengwa uragereranijwe.Noneho shyiramo urugero rukwiye rwa hydrochloric aside na aside ya oxyde mumazi ashyushye kuri 90 ° C kugirango wagure amajwi.Umwuma muri centrifuge.Iyo ubuhehere bwibintu biri munsi ya 60%, bamesa utabogamye, hanyuma ubumishe munsi ya 5% hamwe numwuka ushushe kuri 130 ° C.Amaherezo yamenaguye mumashanyarazi ya mesh 20 kugirango abone ibicuruzwa byarangiye.

Ibicuruzwa biranga Hydroxypropyl Methyl Cellulose:

1. Hydroxypropyl methylcellulose irashobora gushonga byoroshye mumazi akonje kandi izashonga mumazi ashyushye.Nyamara, ubushyuhe bwa gelation mumazi ashyushye buri hejuru cyane ugereranije na methylcellulose.Kugabanuka mumazi akonje nabyo biratera imbere cyane hejuru ya methyl selile.

2. Ubukonje bwa hydroxypropyl methylcellulose bufitanye isano nuburemere bwa molekile, kandi ubukonje buri hejuru iyo uburemere bwa molekile ari bunini.Ubushyuhe nabwo bugira ingaruka ku bwenge bwabwo, uko ubushyuhe bwiyongera, ubukonje bugabanuka.Ariko ububobere bwayo buri hejuru ya methyl selulose.Igisubizo cyacyo gihamye mubushyuhe bwicyumba.

Ubushobozi bwo gufata amazi ya hydroxypropyl methylcellulose biterwa nubunini bwiyongereyeho, ibishishwa, nibindi, kandi igipimo cyacyo cyo gufata amazi kiri hejuru yubwa methyl selile.

3. Hydroxypropyl methylcellulose ihamye kuri acide na alkali, kandi igisubizo cyamazi cyacyo gihamye murwego rwa pH = 2-12.Soda ya Caustic n'amazi ya lime ntacyo bihindura kumiterere yabyo, ariko alkali irashobora kwihutisha iseswa ryayo kandi ikongera ubwiza bwayo.Hydroxypropyl methylcellulose ihamye kumunyu usanzwe, ariko iyo ubunini bwumuti wumunyu mwinshi, ubwiza bwumuti wa hydroxypropyl methylcellulose bikunda kwiyongera.

4. Hydroxypropyl methylcellulose irashobora kuvangwa na polymer zishonga mumazi kugirango bibe igisubizo kimwe, cyinshi cyane.Nka alcool ya polyvinyl, ifu yamazi yikiyaga ether, amase yimboga, nibindi.

Hydroxypropyl methylcellulose ifite imbaraga zo kurwanya enzyme kurusha methylcellulose, kandi igisubizo cyacyo ntigishobora kwangirika cyane kuruta methylcellulose.

5. Gufatanya hagati ya hydroxypropyl methylcellulose nuburyo bwa minisiteri biruta ibya methylcellulose.

Amababi avanze neza ni sima, igiteranyo cyiza, inyongeramusaruro namazi, nibice bitandukanye bigenwa ukurikije imikorere.Nyuma yo kuvanga gupimwa no kuvangwa ku kigero runaka kuri sitasiyo ivanga, imvange ijyanwa aho ikoreshwa n’ikamyo ivanga ikabikwa mu kintu cyihariye, kandi imvange itose ikoreshwa mu gihe cyagenwe.

Nigute ushobora gusuzuma ubwiza bwa hydroxypropyl methylcellulose?

Urebye ubuziranenge bwa hydroxypropyl methylcellulose ahanini biterwa n'ibipimo bibiri, kimwe ni urwego rwo gusimbuza (DS) ikindi ni ubuziranenge.Mubisanzwe, imiterere ya carboxymethyl selulose iratandukanye niba urwego rwo gusimburana rutandukanye;urwego rwo hejuru rwo gusimbuza, gukomera gukomeye, nuburyo bwiza bwo gukorera mu mucyo no guhagarara neza.Nkuko bigaragazwa na raporo zibishinzwe, transparency ya carboxymethyl selulose iba nziza mugihe urwego rwo gusimburwa ari ~, kandi ubwiza bwumuti wacyo wamazi ni mwinshi mugihe agaciro ka pH ari 6-9.Nukuvuga, gupima ubuziranenge bwa carboxymethyl selulose, birakenewe ko dusobanukirwa neza urwego rwasimbuwe nubuziranenge.Ibi bipimo byombi byujuje ibisabwa, bivuze ko ubuziranenge bwayo ari bwiza cyane.