Hydroxypropylmethylcellulose

Nyochaa: akpọrọ HPMC, ọcha ma ọ bụ na-acha ọcha fibrous ma ọ bụ ntụ ntụ granular. Enwere ọtụtụ ụdị cellulose ma na-ejikarị ya eme ihe, mana anyị na-akpọtụrụ ndị ahịa na ụlọ ọrụ ihe owuwu ụlọ ntụ ntụ. Cellulose kachasị na-ezo aka na hypromellose.

Production usoro: The isi akụrụngwa nke HPMC: nụchara anụcha owu, methyl chloride, propylene oxide, ndị ọzọ akụrụngwa gụnyere flake alkali, acid, toluene, isopropanol, wdg. Na-emeso ndị nụchara anụcha cellulose na alkali ngwọta na 35-40 ℃ maka ọkara otu. awa, pịa, tufuo cellulose, na afọ nke ọma na 35 ℃, nke mere na nkezi ogo nke polymerization nke nwetara. eriri alkali dị n'ime oke achọrọ. Tinye eriri alkali n'ime kettle etherification, tinye propylene oxide na methyl chloride n'aka nke ya, na etherify na 50-80 Celsius maka awa 5, na oke nrụgide nke ihe dịka 1.8 MPa. Mgbe ahụ tinye ihe kwesịrị ekwesị nke hydrochloric acid na oxalic acid na mmiri ọkụ na 90 Celsius C iji sachaa ihe iji gbasaa olu. Wepu mmiri site na centrifuge. Na-asa ahụ ruo mgbe na-anọpụ iche, na mgbe mmiri ọdịnaya dị n'ime ihe na-erughị 60%, kpochaa ya na ikuku na-ekpo ọkụ na 130 ° C na-erughị 5%. Arụ ọrụ: njide mmiri, ndim, thixotropic mgbochi sag, ikuku-enraining workability, retarding ntọala.

Njide mmiri: Njide mmiri bụ ihe kachasị mkpa nke cellulose ether! Na mmepụta nke putty gypsum mortar na ihe ndị ọzọ, ngwa cellulose ether dị mkpa. Nnukwu njide mmiri nwere ike meghachi omume n'ụzọ zuru ezu ciment ash na calcium gypsum (ka mmeghachi omume ahụ n'ụzọ zuru ezu, otú ahụ ka ike dị ukwuu). N'okpuru otu ọnọdụ ahụ, ka viscosity nke cellulose ether dị elu, ka mma na-ejigide mmiri (ohere dị n'elu 100,000 viscosity na-ebelata); dị elu nke usoro onunu ogwu, ka njigide mmiri dị mma, na-abụkarị obere cellulose ether nwere ike ime ka arụ ọrụ nke ngwa agha dịkwuo mma. Ọnụ ọgụgụ njide mmiri, mgbe ọdịnaya ruru ọkwa ụfọdụ, usoro nke ịba ụba nke njide mmiri na-eji nwayọọ nwayọọ; ọnụ ọgụgụ njide mmiri nke cellulose ether na-ebelatakarị mgbe ọnọdụ okpomọkụ na-abawanye, ma ụfọdụ cellulose ethers gel-gel na-arụkwa ọrụ ka mma n'okpuru ọnọdụ okpomọkụ dị elu. Njide mmiri. Mkparịta ụka dị n'etiti mkpụrụ ndụ mmiri na cellulose ether molecular chains na-enyere mkpụrụ ndụ mmiri aka ịbanye n'ime agbụ cellulose ether macromolecular wee nweta ike njikọ siri ike, si otú ahụ na-akpụ mmiri n'efu, na-ekekọta mmiri, na imeziwanye njide mmiri nke ciment slurry.

Thickening, thixotropic na mgbochi sag: na-enye ezigbo viscosity na ngwa agha mmiri! Ọ nwere ike ịbawanye nrapado dị n'etiti ngwa ngwa mmiri na oyi akwa, ma melite arụmọrụ mgbochi nke ngwa agha. Mmetụta siri ike nke cellulose ethers na-abawanye nguzogide mgbasa na homogeneity nke ihe ndị a gwakọtara ọhụrụ, na-egbochi delamination ihe, nkewa na ọbara ọgbụgba. Mmetụta siri ike nke cellulose ethers na ihe ndị sitere na ciment sitere na viscosity nke ngwọta ether cellulose. N'okpuru otu ọnọdụ ahụ, ka viscosity nke cellulose ether dị elu, ọ ka mma viscosity nke ihe eji eme ciment a gbanwere, ma ọ bụrụ na viscosity dị ukwuu, ọ ga-emetụta mmiri na ịrụ ọrụ nke ihe ahụ (dị ka trowel na-egbuke egbuke na batch). scraper). na-arụ ọrụ). Ngwa ngwa na-edozi onwe ya na ihe na-ejikọta onwe ya nke na-achọ ka mmiri dị elu chọrọ obere viscosity nke cellulose ether. Tụkwasị na nke ahụ, mmetụta dị nro nke cellulose ether ga-eme ka mmiri na-achọ ihe ndị dabeere na ciment ma mee ka mkpụrụ nke ngwa agha dịkwuo elu. Nnukwu viscosity cellulose ether aqueous ngwọta nwere thixotropy dị elu, nke bụkwa isi njirimara cellulose ether. Aqueous ngwọta nke cellulose n'ozuzu nwere pseudoplastic, na-abụghị thixotropic eruba Njirimara n'okpuru ha gel okpomọkụ, ma Newtonian eruba Njirimara na ala shiee ọnụego. Pseudoplasticity na-abawanye site n'ịdị arọ molekụla na-abawanye ma ọ bụ itinye uche nke ether cellulose. A na-emepụta gels ihe owuwu mgbe okpomọkụ na-abawanye, na nnukwu thixotropic eruba na-eme. Cellulose ethers nwere nnukwu mkpokọta na viscosity dị ala na-egosipụta thixotropy ọbụna n'okpuru okpomọkụ gel. Ngwongwo a bara ezigbo uru maka owuwu ihe owuwu ụlọ iji dozie ọkwa ya na sag. Ekwesiri ighota ebe a na elu viscosity nke cellulose ether, mma njigide mmiri, ma elu viscosity, elu nke ikwu molekul arọ nke cellulose ether, na kwekọrọ ekwekọ mbelata ya solubility, nke nwere ihe ọjọọ. mmetụta na ngwa agha ịta na workability.

Ihe kpatara ya: Cellulose ether nwere mmetụta ikuku na-eme ka ọ pụta ìhè na ihe ndị dabeere na ciment ọhụrụ. Cellulose ether nwere ma a hydrophilic otu (hydroxyl otu, ether otu) na a hydrophobic otu (methyl otu, glucose mgbanaka), bụ a surfactant, nwere elu ọrụ, ma si otú na-enwe ikuku-entraning mmetụta. Mmetụta ikuku nke cellulose ether ga-emepụta mmetụta "bọọlụ", nke nwere ike imeziwanye ọrụ ọrụ nke ihe a gwakọtara ọhụrụ, dị ka ịba ụba plasticity na ire ụtọ nke ngwa agha n'oge arụ ọrụ, nke bara uru na paving nke ngwa agha. ; ọ ga-emekwa ka mpụta ngwa ngwa pụta. , na-ebelata ọnụ ahịa nke mmepụta ngwa agha; ma ọ ga-eme ka porosity nke ihe siri ike na-eme ka ọ dịkwuo elu ma belata ihe eji arụ ọrụ ya dị ka ike na mgbanwe mgbanwe. Dị ka a surfactant, cellulose ether nwekwara a wetting ma ọ bụ lubricating mmetụta na simenti irighiri, nke ya na ikuku-entraning mmetụta na-eme ka fluidity nke simenti dabeere n'ihe, ma ya ndim mmetụta ga-ebelata fluidity. Mmetụta nke eruba bụ ngwakọta nke plasticizing na ndim mmetụta. Mgbe ọdịnaya nke cellulose ether dị ntakịrị, a na-egosipụtakarị ya dị ka plasticizing ma ọ bụ mmetụta na-ebelata mmiri; mgbe ọdịnaya dị elu, mmetụta na-ebuwanye ibu nke cellulose ether na-abawanye ngwa ngwa, na mmetụta ikuku ya na-eme ka ọ bụrụ nke jupụtara na ya, ya mere arụ ọrụ ahụ na-abawanye. Mmetụta siri ike ma ọ bụ ụbara agụụ mmiri.

Ntọala nkwụghachi azụ: Cellulose ether nwere ike igbu oge usoro hydration nke ciment. Cellulose ethers na-enye ngwa agha ahụ ihe dị iche iche bara uru, ma na-ebelata mmalite nke hydration okpomọkụ ntọhapụ nke ciment ma na-egbu oge usoro hydration kinetic nke ciment. Nke a adịghị mma maka iji ngwa agha na mpaghara oyi. Ihe na-akpata nkwụghachi azụ a bụ mgbasa nke cellulose ether molecules na ngwaahịa hydration dị ka CSH na ca(OH)2. N'ihi mmụba nke viscosity nke ngwọta pore, cellulose ether na-ebelata mmegharị nke ion na ngwọta, si otú ahụ na-egbu oge usoro hydration. N'ịdị elu nke cellulose ether na ihe gel ịnweta, ka mmetụta nke igbu oge hydration na-apụtawanye ìhè. Cellulose ethers ọ bụghị nanị na ntọala azụ azụ, kamakwa ọ na-ebelata usoro siri ike nke simenti ngwa agha. Mmetụta retardation nke cellulose ether na-adabere ọ bụghị nanị na ntinye ya na usoro gel nke ịnweta, kamakwa na nhazi nke kemịkal. N'ịdị elu nke methylation nke HEMC, nke ka mma mmetụta nkwụsị azụ nke cellulose ether. Mmetụta nkwụghachi azụ dị ike karị. Otú ọ dị, viscosity nke cellulose ether enwechaghị mmetụta na hydration kinetics nke ciment. Site na mmụba nke cellulose ether ọdịnaya, nhazi oge nke ngwa agha na-abawanye nke ukwuu. Enwere mmekọrịta dị mma na-enweghị isi n'etiti mmalite mmalite oge nke ngwa agha na ọdịnaya nke cellulose ether, na oge nhazi ikpeazụ nwere ezigbo njikọ linear na ọdịnaya nke cellulose ether. Anyị nwere ike ijikwa oge na-arụ ọrụ nke ngwa agha site n'ịgbanwe ọdịnaya nke cellulose ether. N'ime ngwaahịa ahụ, ọ na-arụ ọrụ nke njide mmiri, na-agbakọ, na-egbu oge ike hydration ciment, na imeziwanye arụmọrụ ihe owuwu. Ezi mmiri njigide ikike na-eme ka ciment gypsum ash calcium meghachi omume ọzọ kpamkpam, budata enwekwu mmiri viscosity, mma nkekọ ike nke ngwa agha, na n'otu oge ahụ nwere ike n'ụzọ kwesịrị ekwesị melite tensile ike na shiee ike, ukwuu mma ewu mmetụta na-arụ ọrụ arụmọrụ. Oge mgbanwe. Na-akwalite ịgbasa ma ọ bụ mgbapụta nke ngwa agha, yana ike nhazi. N'ime usoro ntinye akwụkwọ n'ezie, ọ dị mkpa iji chọpụta ụdị, viscosity, na ọnụ ọgụgụ nke cellulose dịka ngwaahịa dị iche iche, àgwà ihe owuwu, na gburugburu ebe obibi.