Ko te Hydroxypropyl methylcellulose (ingoa INN: Hypromellose), he mea ngawari ano hei hypromellose (hydroxypropyl methylcellulose, whakapotohia hei HPMC), he momo momo momo etero whakaurunga nonionic cellulose.He waerau hangarua, hohekore, viscoelastic e whakamahia nuitia ana hei whakahinuhinu i roto i te ophthalmology, hei awhina, hei awhina ranei i roto i nga rongoa-waha, a ka kitea i roto i nga momo hua arumoni.
Hei taapiri kai, ka taea e te hypromellose te mahi i nga mahi e whai ake nei: ko te whakaemulsifier, te whakamaarata, te kai whakatarewa me te whakakapi mo te gelatin kararehe.Ko tana waehere (E-waehere) kei te Codex Alimentarius ko E464.
Āhuatanga matū:
Ko te hua kua oti o te hydroxypropyl methylcellulose he paura ma, he totoka kikokore ma ranei, a ka haere te rahi o te matūriki i roto i te tatari 80-mata.Ko te tauwehenga o te ihirangi methoxyl ki te ihirangi hydroxypropyl o te hua kua oti te rereke, me te rereke o te viscosity, na reira ka waiho hei momo momo me nga mahi rereke.Ko nga ahuatanga o te wairewa i roto i te wai matao me te kore e rewa i roto i te wai wera he rite ki te methyl cellulose, a ko tona whakarewanga i roto i nga whakarewa waro nui atu i te wai.Ka taea te rewa i roto i te methanol anhydrous me te ethanol, ka taea hoki te rewa i roto i te waiwaro chlorinated penei i te dichloro methane, trichloroethane, me nga whakarewa waro penei i te acetone, isopropanol, me te waipiro diacetone.Ka rewa ana ki te wai, ka whakakotahi ki nga ngota ngota wai ka hanga he colloid.He pumau ki te waikawa me te kawakawa, kaore e pa ki te awhe pH=2~12.Ko te Hypromellose, ahakoa ehara i te paitini, he muramura, he kaha te tauhohenga ki nga matū waiora.
Ka piki ake te viscosity o nga hua HPMC me te pikinga o te kukū me te taumaha ngota, a ka piki te pāmahana, ka timata te heke o tona pokey.Ka tae ki tetahi pāmahana, ka piki ohorere te pokey, ka puta te wai.teitei o.Ka noho pumau tana wairewa wai i te pāmahana rūma, engari ka taea te whakahekehia e nga enzymes, a, karekau he ahuatanga whakahekenga o tona pokey whanui.He momo waiariki motuhake, he pai te hanga kiriata me te mahi mata.
Te hanga:
I muri i te maimoatanga o te cellulose ki te alkali, ka taea e te anion alkoxy i hangaia e te deprotonation o te roopu hydroxyl te taapiri i te propylene oxide ki te whakaputa i te hydroxypropyl cellulose ether;ka taea hoki te whakakoi ki te methyl chloride hei whakaputa i te methyl cellulose ether.Ka puta te Hydroxypropyl methylcellulose i te wa e mahia ana nga tauhohenga e rua i te wa kotahi.
Ma te whakamahi:
Ko te whakamahinga o te hydroxypropyl methylcellulose he rite ki era atu etera cellulose.Kei te nuinga whakamahia te reira rite te dispersant, suspending agent, thickener, emulsifier, stabilizer me te adhesive i roto i ngā mara.He pai ake i era atu etera cellulose i runga i te whakarewatanga, te whakamararatanga, te marama me te aukati i te whaa.
I roto i te ahumahi kai me te rongoa, ka whakamahia hei taapiri.Ka whakamahia hei whakapiri, hei whakamaarama, hei whakamarara, Emollient, hei whakapumau me te emulsifier.Karekau he paitini, karekau he uara kai, karekau he huringa metabolic.
I tua atu, he tono a HPMC ki te polymerization resin synthetic, petrochemicals, ceramics, papermaking, hiako, cosmetics, coatings, building materials and photosensitive printing plates.
Te wa tuku: Maehe-15-2023