Hydroxypropyl methylcellulose (HPMC) inonyungudika isina-ionic cellulose ether inoshandiswa zvakanyanya mukuvaka, mishonga, chikafu, zvigadzirwa zvekuchengeta munhu uye machira. Mumaindasitiri machira uye pendi, HPMC yave yakakosha yekuwedzera nekuda kwekusiyana kwayo kwemuviri nemakemikari zvimiro. Basa rayo guru nderekushanda semukobvu, stabilizer, firimu-forming agent uye rheology control agent kuti ivandudze kushanda, kuchengetedza kugadzikana uye kuvhara kwehutano hwehuputi uye pendi.
1. Basic maitiro eHPMC
HPMC musanganiswa unowanikwa nekemikari kushandura selulosi chaiwo. Iyo ine zvinotevera zvakakosha zvemuviri uye zvemakemikari zvimiro, zvichiita kuti ishandiswe zvakanyanya mumaindasitiri machira uye pendi:
Kunyungudika kwemvura: HPMC ine kunaka kunyungudika mumvura inotonhora, ichigadzira yakajeka viscous mhinduro inobatsira kuvandudza viscosity yepende.
Thermal gelability: Pane imwe tembiricha, HPMC inogadzira gel uye yodzokera kune imwe mhinduro mushure mekutonhora. Ichi chimiro chinobvumira kuti chipe zvirinani coating performance pasi pemamiriro ekuvaka chaiwo.
Yakanaka firimu-yekugadzira zvimiro: HPMC inogona kuumba inoenderera firimu kana pendi yaoma, ichivandudza kunamatira uye kusimba kwejasi.
Kugadzikana: Iine kupikisa kwakanyanya kune acids, mabhesi uye electrolytes, kuvimbisa kugadzikana kwekuputira pasi pekuchengetedza kwakasiyana uye kushandiswa kwemamiriro.
2. Mabasa makuru eHPMC mune maindasitiri ekupfeka uye pendi
2.1 Mukobvu
Mumaindasitiri machira, iyo thickening mhedzisiro yeHPMC inonyanya kukosha. Mhinduro yayo ine yakakwira viscosity uye yakanaka shear kutetepa zvivakwa, ndiko kuti, panguva yekukurudzira kana kupenda maitiro, iyo viscosity inoderera kwechinguva, nekudaro ichifambisa kuvakwa kwepende, uye viscosity ichakurumidza kupora mushure mekuvakwa kwakamira kudzivirira pendi. kubva pakudonha. Ichi chivakwa chinovimbisa kunyangwe kuvharidzira application uye kunoderedza sagging.
2.2 Kudzora Rheology
HPMC ine simba rakakosha pane rheology yejasi. Iyo inochengetedza iyo viscosity yakakodzera yejasi panguva yekuchengetedza uye inodzivirira machira kubva pakudonha kana kugadzirisa. Panguva yekushandiswa, HPMC inopa akakodzera ekuyeresa zvivakwa kubatsira pendi kugovera zvakaenzana pamusoro penzvimbo yekushandisa uye kuumba yakapfava yekuputira. Uye zvakare, iyo shear kuonda zvimiro inogona kuderedza mabhurashi mamaki kana roll mamaki anogadzirwa panguva yekushandisa uye kugadzirisa kutaridzika kweiyo yekupedzisira yekuputira firimu.
2.3 Mumiriri wekugadzira firimu
Iyo firimu-inogadzira zvimiro zveHPMC inobatsira kuvandudza kunamatira uye kusimba kwefirimu rejasi. Munguva yekuomesa, iyo firimu yakaumbwa neHPMC ine kusimba kwakanaka uye elasticity, iyo inogona kukwidziridza kuramba kwekuputika uye kupfeka kuramba kwejasi, kunyanya mune mamwe anodiwa zvakanyanya maindasitiri ekuputira maapplication, senge ngarava, mota, nezvimwewo, HPMC The Mafirimu ekugadzira zvinhu anogona kunyatso kuvandudza kusimba kwejasi.
2.4 Stabilizer
Sekudzikamisa, HPMC inogona kudzivirira kunaya kwe pigment, mafirita uye zvimwe zvimedu zvimedu mukugadzira machira, nekudaro zvichivandudza kugadzikana kwekuchengetedza machira. Izvi zvinonyanya kukosha kune mvura-based coatings. HPMC inogona kurambidza delamination kana agglomeration yejasi panguva yekuchengetedza uye ive nechokwadi chemhando yechigadzirwa kuenderana kwenguva yakareba yekuchengetedza.
3. Kushandiswa kweHPMC mune zvakasiyana-siyana
3.1 Mvura-based coatings
Mvura-yakavakirwa machira yakawana kutariswa kwakanyanya mumakore achangopfuura nekuda kwehushamwari hwavo kwezvakatipoteredza uye yakaderera volatile organic compound (VOC) emissions. HPMC inoshandiswa zvakanyanya mumvura-based coatings. Seyakakora uye inodzikamisa, HPMC inogona kunyatso kuvandudza kugadzikana kwekuchengetedza uye kushanda kwemvura-yakavakirwa machira. Inopa yakanakisa kuyerera kwekudzora munzvimbo dzakaderera kana dzepamusoro tembiricha, zvichiita kuti pendi iite seyakapfapfaidzwa, yakabhurwa kana kukungurutswa.
3.2 Latex pendi
Latex pendi ndeimwe yeanonyanya kushandiswa architectural coatings nhasi. HPMC inoshandiswa se rheology control agent uye thickener mu latex pendi, iyo inogona kugadzirisa viscosity ye latex pendi, kuwedzera kupararira kwayo, uye kudzivirira firimu repende kubva pakudonha. Uye zvakare, HPMC ine zvirinani kudzora mhedzisiro pakupararira kwependi yelatex uye inodzivirira zvikamu zvependi kubva pakugadzirisa kana stratifying panguva yekuchengetedza.
3.3 Oiri-yakavakirwa pendi
Kunyangwe kushandiswa kwemafuta-based coatings kwadzikira nhasi nekuwedzera kuomarara kwekuchengetedza kwezvakatipoteredza zvinodiwa, zvichiri kushandiswa zvakanyanya mune mamwe chaiwo maindasitiri minda, senge simbi inodzivirira. HPMC inoshanda senge inomisa mumiriri uye rheology inodzora mumiriri mune mafuta-based coatings kudzivirira pigment kugadzika uye kubatsira iyo coating kuve nechiyero chirinani uye kunamatira panguva yekushandisa.
4. Mashandisiro uye dosage yeHPMC
Huwandu hweHPMC hunoshandiswa mukupfekwa kazhinji hunotarwa nerudzi rwekupfekedza uye nezvinodiwa zvekushandisa. Kazhinji kutaura, huwandu hwekuwedzera hweHPMC hunowanzo kudzorwa pakati pe0.1% ne0.5% yehuremu hwese hwejasi. Iyo yekuwedzera nzira inonyanya kunanga yakaoma hupfu yekuwedzera kana pre-yakagadzirirwa mhinduro uye yobva yawedzerwa. Iyo solubility uye viscosity gadziriso mhedzisiro yeHPMC inobatwa nekupisa, kunaka kwemvura uye nekukurudzira mamiriro. Nokudaro, nzira yekushandisa inoda kugadziriswa maererano nemamiriro chaiwo ekugadzirisa.
Hydroxypropyl methylcellulose (HPMC) inoshandiswa seyakakura, rheology control agent, film-forming agent uye stabilizer muindasitiri yekugadzira uye pendi, inovandudza zvakanyanya kuita kwekuvaka, kugadzikana kwekuchengetedza uye yekupedzisira yekuvhara firimu rejasi. quality. Nekusimudzirwa kwemachira ane hushamwari kwezvakatipoteredza uye kuwedzera kwemusika kudiwa kweakanyanya-kuita machira, HPMC icharamba ichiita basa rakakosha mune remangwana maindasitiri ekupfeka. Kuburikidza nekushandisa zvine musoro kweHPMC, iyo yemuviri uye yemakemikari zvimiro zvejasi zvinogona kuvandudzwa, uye kusimba uye kushongedza mhedzisiro yejasi inogona kuvandudzwa.
Nguva yekutumira: Sep-13-2024