Hydroxypropyl methylcellulose (HPMC, Hydroxypropyl Methylcellulose) yog cov khoom siv polymer feem ntau siv hauv cov nplaum, cov khoom siv hauv tsev thiab kev npaj tshuaj. Vim nws cov qauv tshuaj lom neeg tshwj xeeb thiab cov khoom siv, HPMC tau siv ntau dua hauv cov nplaum, tshwj xeeb tshaj yog hauv kev txhim kho daim ntawv cog lus.
Cov khoom siv tshuaj thiab cov qauv ntawm HPMC
HPMC yog ib qho derivative ntawm cellulose, tsim los ntawm kev hloov cov hydroxyl pawg ntawm cov cellulose molecule nrog methoxy (-OCH3) thiab hydroxypropoxy (-OCH2CH (OH) CH3) pawg. Cov qauv tshwj xeeb ntawm HPMC muab ntau yam khoom zoo, xws li dej solubility, thermal gelling, film-forming thiab thickening zog. Cov khoom no tso lub hauv paus rau nws siv hauv cov nplaum, tshwj xeeb tshaj yog nyob rau hauv kev tsim kho thiab kev lag luam adhesives.
Cov txheej txheem ntawm kev ua ntawm HPMC hauv cov nplaum
Cov nyhuv Thickening HPMC muaj cov nyhuv thickening zoo heev thiab tuaj yeem ua kom cov viscosity ntawm cov nplaum. Nyob rau hauv daim ntawv nplaum, HPMC ua raws li cov thickener, txhim kho cov khoom rheological ntawm cov nplaum los ntawm kev tsim ib lub network ntawm cov saw ntev molecules hauv cov kua theem. Qhov thickening no pab cov nplaum sib faib ntau qhov sib npaug thaum lub sijhawm thov, ua rau thaj chaw sib cuag ntawm cov ntaub ntawv thiab yog li txhim kho daim ntawv cog lus.
Water Retention HPMC muaj peev xwm tuav tau dej zoo heev, tshwj xeeb tshaj yog nyob rau hauv cov khoom siv xws li cement-based adhesives, khaws cov dej noo thaum lub sijhawm kho. Cov yam ntxwv no ua kom lub ntsej muag zoo ib yam ntawm cov nplaum thiab zam kev sib koom ua ke tsis sib xws lossis poob ntawm lub zog vim kev ya raws sai. Tsis tas li ntawd, cov khoom tuav dej ntawm HPMC txuas ntxiv lub sijhawm qhib ntawm cov nplaum, ua rau kev tsim kho kom yooj yim dua thiab yog li txhim kho cov txiaj ntsig kev sib txuas zaum kawg.
Cov khoom ua yeeb yaj kiab Cov yeeb yaj kiab tsim cov khoom ntawm HPMC kuj yog ib qho tseem ceeb rau kev txhim kho kev sib raug zoo. HPMC tuaj yeem sau cov yeeb yaj kiab tuab nyob rau saum npoo ntawm cov khoom, uas tsis yog ua kom cov khoom siv tshuab ntawm cov nplaum, tab sis kuj muab cov dej tsis huv thiab tshuaj lom neeg. Hauv qee cov ntawv thov tshwj xeeb, xws li kev sib txuas ntoo lossis cov khoom siv ntawv gluing, cov txheej txheem tiv thaiv zaj duab xis tsim los ntawm HPMC tuaj yeem pab txhim kho daim ntawv cog lus kom muaj zog thiab ua kom lub neej ntev.
Interfacially modified HPMC kuj tuaj yeem txhim kho qhov sib txuam sib luag ntawm cov nplaum thiab cov substrate. Vim yog cov qauv polar molecular ntawm HPMC, nws tuaj yeem tsim muaj zog lub cev lossis tshuaj lom neeg nrog rau qhov chaw ntawm ntau yam ntaub ntawv, tshwj xeeb tshaj yog nyob rau hauv substrates nrog ntau polarity (xws li iav, ceramics, hlau, thiab lwm yam), HPMC tuaj yeem txhim kho Adhesion ntawm cov nplaum. thiab substrate. Qhov kev hloov kho interface no yog qhov tseem ceeb hauv kev txhim kho daim ntawv cog lus.
Kev siv HPMC hauv cov tshuab nplaum sib txawv
Water-Based Adhesives Nyob rau hauv dej-raws li nplaum nplaum, HPMC plays lub luag hauj lwm tseem ceeb raws li ib tug thickener thiab dej tuav tus neeg sawv cev. Lub ntsiab tseem ceeb ntawm cov nplaum nplaum yog dej. Cov dej tuav cov khoom ntawm HPMC tuaj yeem pab cov nplaum kho kom zoo dua ntawm qhov chaw ntawm cov substrate thiab ua kom muaj zog sib txuas. Tsis tas li ntawd, cov yeeb yaj kiab tsim cov khoom ntawm HPMC kuj tseem ua rau muaj kev ua haujlwm ntev ntawm cov nplaum dej.
Cement-based adhesive HPMC yog siv dav hauv cov cement-based adhesives xws li pobzeb adhesives thiab phab ntsa plastering. Cov cement-based adhesives yuav tsum muaj qee qhov av noo thaum lub sijhawm kho, thiab cov dej tuav tau zoo ntawm HPMC ua kom cov cement zoo sib xws thaum lub sijhawm kho thiab tsis txhob tawg lossis tsis muaj zog los ntawm cov dej nrawm nrawm. Tsis tas li ntawd, HPMC txhim kho kev tsim kho ntawm cov nplaum nplaum, ua rau kev tsim kho kom yooj yim dua thiab du, thiab ntxiv dag zog rau kev sib txuas.
Latex xim thiab lwm yam architectural coatings Nyob rau hauv latex xim thiab lwm yam architectural coatings, HPMC yog siv raws li ib tug thickener thiab stabilizer los txhim kho lub uniformity thiab adhesion zog ntawm lub txheej, xyuas kom meej tias lub txheej yuav zoo dua adhere rau ntawm lub substrate, yog li txhim kho cov xim. durability thiab waterproofing zog. Cov cuab yeej no yog qhov tseem ceeb rau qhov zoo thiab kev sib raug zoo ntawm cov vaj tsev txheej txheej.
Cov xwm txheej cuam tshuam rau HPMC kev ua haujlwm
Degree of Hloov Cov qib ntawm kev hloov ntawm HPMC (piv txwv li, qhov kev faib ua feem ntawm methoxy thiab hydroxypropoxy pawg hloov hauv cov molecule) ncaj qha cuam tshuam rau nws cov kev ua tau zoo hauv cov nplaum. Feem ntau hais lus, qhov siab dua qhov kev hloov pauv, qhov zoo dua cov dej tuav thiab cov yeeb yaj kiab tsim ntawm HPMC, yog li ua kom lub zog sib txuas ntawm cov nplaum. Yog li ntawd, kev xaiv muaj txiaj ntsig ntawm qib kev hloov pauv ntawm HPMC tuaj yeem txhim kho qhov ua tau zoo ntawm cov nplaum.
Molecular Luj Qhov hnyav molecular ntawm HPMC muaj kev cuam tshuam ncaj qha rau nws cov nyhuv thickening thiab cov yeeb yaj kiab tsim cov khoom. HPMC nrog qhov hnyav dua molecular muaj zog thickening nyhuv, thaum HPMC nrog ib tug me me molecular hnyav yog ntau soluble thiab haum rau siv nyob rau hauv daim ntawv nplaum uas yuav tsum tau ceev curing. Yog li, xaiv HPMC nrog qhov hnyav molecular raws li cov kev xav tau tshwj xeeb ntawm cov nplaum nplaum yog qhov tseem ceeb los txhim kho lub zog sib txuas.
Environmental Factors HPMC nthuav tawm cov khoom sib txawv hauv ib puag ncig sib txawv. Piv txwv li, qhov thickening thiab dej tuav cov khoom ntawm HPMC tej zaum yuav cuam tshuam rau qhov kub thiab txias ib puag ncig. Yog li ntawd, cov qauv thiab kev siv nyiaj ntawm HPMC raug hloov kho rau qhov sib txawv siv ib puag ncig kom ntseeg tau tias cov nplaum tuav lub zog muaj zog hauv ntau yam.
HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov nplaum nplaum nplaum. Los ntawm nws cov txheej txheem ntau yam xws li thickening, dej tuav, kev tsim cov yeeb yaj kiab thiab kev hloov pauv ntawm lub ntsej muag, HPMC tuaj yeem txhim kho kev ua haujlwm ntawm cov nplaum, tshwj xeeb tshaj yog nyob rau hauv cov dej-raws li nplaum nplaum, cement-based adhesives thiab architectural coatings. Raws li cov cuab yeej nplaum txuas ntxiv txhim kho, HPMC lub luag haujlwm hauv kev txhim kho daim ntawv cog lus muaj zog yuav dhau los ua qhov tseem ceeb.
Post lub sij hawm: Sep-09-2024