1. Gabatarwa
Hydroxypropyl Methylcellulose (HPMC) shine polymer mai narkewa da ruwa wanda aka yadu ana amfani dashi a cikin sutura, kayan gini, magunguna da sauran fannoni. A cikin shafi masana'antu, HPMC ba kawai amfani da a matsayin thickener, stabilizer da film tsohon, amma kuma a matsayin sosai m dispersant. Babban aikinsa a cikin sutura ya haɗa da inganta kwanciyar hankali na sutura, inganta rheology, inganta aikin gine-gine da ingancin suturar ƙarshe.
2. Tsarin halaye na HPMC
Tsarin kwayoyin halitta na HPMC ya ƙunshi kwarangwal cellulose da hydroxypropyl da methyl. Tsarinsa na musamman yana ba HPMC solubility a cikin ruwa da ikon samar da maganin viscoelastic a cikin maganin ruwa. HPMC yana mu'amala da ƙwayoyin ƙarfi ta hanyar haɗin gwiwar hydrogen da rundunonin van der Waals, ta haka ne ke narke cikin ruwa da samar da ingantaccen tsarin watsawa.
Nauyin kwayoyin halitta da digiri na maye gurbin (DS) na HPMC yana shafar solubility da danko. Gabaɗaya magana, mafi girman nauyin kwayoyin halitta da digiri na maye yana ƙara danko da lokacin rushewar HPMC. Waɗannan halayen suna da mahimmanci don aikin HPMC azaman mai tarwatsawa.
3. Matsayin HPMC a cikin sutura
3.1 Inganta rarrabuwar launi
Ana amfani da HPMC galibi don haɓaka rarrabuwa na pigments a cikin sutura. A cikin tsarin samar da sutura, haɓakar ƙwayoyin pigment shine matsala na yau da kullum, wanda ke haifar da rashin daidaituwa da rashin daidaituwa, yana tasiri mai sheki da launi na launi. Masu watsawa na HPMC suna taka rawa a cikin abubuwan da ke gaba:
Electrostatic repulsion: Maganin samar da HPMC narka a cikin ruwa yana da babban aiki na sama kuma ana iya adsorbed a saman barbashi na pigment don yin cajin su. Wannan ƙwaƙƙwaran electrostatic yana raba ɓangarorin pigment daga juna kuma yana rage haɓakawa.
Tasirin hanawa na Steric: Sarkar polymer na HPMC na iya samar da wani Layer mai kariya a saman ɓangarorin pigment, haɓaka tazara tsakanin barbashi, don haka hana jan hankali da haɓaka tsakanin barbashi.
Tasirin daidaitawa: HPMC yana haɗuwa tare da kwayoyin ruwa ta hanyar haɗin hydrogen don samar da tsarin tsari mai tsayayyen tsari, hana ƙwayoyin pigment daga daidaitawa a cikin tsarin, da inganta kwanciyar hankali na sutura.
3.2 Inganta rheology
Wani muhimmin aiki na HPMC shine inganta rheology na sutura, wato, kwarara da halayen lalacewa na sutura. Kyakkyawan halayen rheological na sutura suna taimaka masa ya sami kyakkyawan shimfidawa da daidaitawa a lokacin aikin ginin, samar da fim ɗin suturar uniform. HPMC yana rinjayar rheological Properties na rufi ta hanyar wadannan hanyoyin:
Haɓakawa na Viscoelasticity: Tsarin hanyar sadarwa na sarkar polymer da HPMC ta kafa a cikin ruwa yana ba da bayani wani ɗanɗano. Wannan viscoelasticity na iya daidaita yanayin motsi na sutura, don haka yana da danko mai dacewa lokacin da ake gogewa, rage sagging da dripping.
Shear thinning: HPMC Magani yawanci suna nuna kaddarorin ɓarkewar ƙarfi, wato, suna da ɗanko mafi girma a ƙananan ƙimar shear da ƙananan danko a babban ƙimar shear. Wannan kadarar ta sa suturar ta sami kwanciyar hankali mafi kyau a cikin yanayin da ba ta dace ba kuma mai sauƙin yadawa yayin gini.
Thixotropy: Wasu mafita na HPMC kuma suna nuna thixotropy, wato, an dawo da danko yayin hutawa, wanda yake da mahimmanci musamman don rage sagging da digowar rufin.
3.3 Inganta aikin shafi
HPMC ba wai kawai yana da tasiri mai mahimmanci akan aikin da ake yi na sutura ba a lokacin ginawa, amma har ma yana inganta ingantaccen kayan aiki na ƙarshe. HPMC yana haɓaka aikin sutura a cikin waɗannan abubuwan:
Rufi flatness: HPMC inganta rheology na shafi, kara habaka bazawa da kuma matakin da shafi, da kuma sa shafi smoother kuma mafi uniform.
Juriya na ruwa da juriya na yanayi: HPMC yana samar da tsarin cibiyar sadarwa mai yawa a cikin sutura, wanda ke ƙara ƙarfin juriya na ruwa da ƙarfin tsufa na shafi, kuma yana inganta yanayin juriya na sutura.
Adhesion: HPMC yana haɓaka mannewa na rufin, don haka rufin zai iya kasancewa da tabbaci a kan farfajiyar maɗaukaki, kuma yana inganta ƙarfin daɗaɗɗen.
4. Misalan aikace-aikacen HPMC
4.1 Rubutun gine-gine
A cikin gine-ginen gine-gine, ana amfani da HPMC don inganta tarwatsawa na pigments da kuma rheology na sutura, musamman don suturar ruwa. HPMC yana inganta kwanciyar hankali da aikin ginin rufin, don haka rufin yana da mafi kyawun daidaitawa da mannewa a kan bango, kuma yana hana fim din daga sagging da rashin daidaituwa.
4.2 Rubutun masana'antu
Har ila yau ana amfani da HPMC sosai a cikin suturar masana'antu. Yana ba kawai inganta dispersibility na pigments, amma kuma inganta gina yi na coatings, yin shafi fim mafi m karfe, filastik da sauran substrates, da kuma kafa shafi fim mafi m.
4.3 Sauran sutura
Har ila yau, ana amfani da HPMC a cikin nau'i na musamman na musamman, irin su gyaran wuta na wuta, maganin lalata, da dai sauransu. Matsayinsa a cikin waɗannan suturar ya fi dacewa don inganta kwanciyar hankali na sutura da aikin fim, don haka kayan ado suna da kyakkyawan aiki. daban-daban hadaddun yanayi.
Kamar yadda wani shafi dispersant, HPMC taka muhimmiyar rawa a inganta dispersibility na pigments, inganta rheology na coatings da inganta yi na shafi fina-finai. Tsarinsa na musamman da aikinsa yana ba shi damar yin amfani da dama a cikin masana'antar sutura. Tare da haɓaka fasahar sutura, aikace-aikacen HPMC zai ci gaba da haɓaka, yana ba da ƙarin damar haɓakawa da haɓaka aikin shafi.
Lokacin aikawa: Juni-25-2024