1. Nhanganyaya
Hydroxypropyl Methylcellulose (HPMC) ipolymer inonyungudika nemvura inoshandiswa zvakanyanya mukupfeka, zvekuvakisa, mishonga nemimwe minda. Muindasitiri yekupfekedza, HPMC haingo shandiswe seyakakora, stabilizer uye firimu rekare, asiwo seanoparadzira zvakanyanya. Basa rayo guru mukuputira rinosanganisira kuvandudza kugadzikana kwekuputira, kuvandudza rheology, kuvandudza kushanda kwekuvaka uye kunaka kwekuvhara kwekupedzisira.
2. Mamiriro ezvinhu eHPMC
Iyo molecular chimiro cheHPMC ine cellulose skeleton uye hydroxypropyl uye methyl substituents. Chimiro chayo chakakosha chinopa HPMC kunyungudika mumvura uye kugona kugadzira viscoelastic mhinduro mune aqueous mhinduro. HPMC inodyidzana nemamorekuru ekunyungudutsa kuburikidza nehydrogen bonding uye van der Waals forces, nokudaro ichinyungudika mumvura nekugadzira yakagadzikana yekuparadzira hurongwa.
Iyo molecular huremu uye dhigirii rekutsiva (DS) yeHPMC inokanganisa kunyungudika kwayo uye viscosity. Kazhinji kutaura, huremu hwemamorekuru uye dhigirii rekutsiva zvinowedzera viscosity uye nguva yekuparara kweHPMC. Aya maitiro akakosha pakuita kweHPMC sechinhu chinoparadzira chinoputira.
3. Basa reHPMC mukuputira
3.1 Kuvandudza pigment dispersibility
HPMC inonyanya kushandiswa kunatsiridza dispersibility ye pigment mune coatings. Mukugadzira maitiro ekuputira, iyo agglomeration ye pigment particles idambudziko rakajairika, rinotungamira kune asina kuenzana uye asina kugadzikana machira, anokanganisa kupenya uye kwemavara kufanana kwejasi. HPMC vanoparadzira vanoita basa mune zvinotevera zvinhu:
Electrostatic repulsion: Mushonga wakagadzirwa neHPMC kunyungudika mumvura une basa repamusoro uye unogona kushambadzwa pamusoro pepigment particles kuti iite chaji. Iyi electrostatic repulsion inoparadzanisa pigment particles kubva kune mumwe uye inoderedza agglomeration.
Steric hindrance effect: Iyo polymer cheni yeHPMC inogona kuumba chidziviriro pamusoro pepigment zvimedu, kuwedzera nzvimbo yepakati pakati pezvimedu, uye nekudaro inhibidza kukwezvana uye kuwirirana pakati pezvimedu.
Kudzikamisa mhedzisiro: HPMC inosanganisirwa nemamorekuru emvura kuburikidza nehydrogen zvisungo kuti igadzire yakagadzika mhinduro sisitimu, kudzivirira pigment zvimedu kubva pakugadzika muhurongwa, uye kugadzirisa kugadzikana kwejasi.
3.2 Kuvandudza rheology
Rimwe basa rakakosha reHPMC nderekuvandudza rheology yejasi, ndiko kuti, kuyerera uye deformation maitiro ekupfeka. Iyo yakanaka rheological properties yejasi inobatsira kuti ive nekupararira kwakanaka uye kuenzana panguva yekuvaka, kuumba firimu rekuvhara yunifomu. HPMC inokanganisa rheological zvimiro zvejasi kuburikidza neanotevera maitiro:
Kukwidziridzwa kweViscoelasticity: Iyo polymer chain network chimiro chakagadzirwa neHPMC mumvura chinopa mhinduro imwe viscoelasticity. Iyi viscoelasticity inogona kugadzirisa mafambiro ekuyerera kwejasi, kuitira kuti ive neyakakodzera viscosity paunenge uchikwesha, kuderedza kudonha uye kudonha.
Shear thinning: HPMC mhinduro dzinowanzo ratidza shear thinning zvivakwa, kureva kuti, dzine viscosity yakakwira pamitengo yakaderera yeshear uye yakaderera viscosity pamitengo yakakwira yekugera. Ichi chivakwa chinoita kuti iyo coating ive nani kugadzikana mune static mamiriro uye nyore kuparadzira panguva yekuvaka.
Thixotropy: Mimwe mhinduro dzeHPMC dzinoratidzawo thixotropy, ndiko kuti, viscosity inodzorerwa pakuzorora, iyo inonyanya kukosha pakuderedza kudonha uye kudonha kwejira.
3.3 Kuvandudza coating performance
HPMC haina kungoita zvakakosha pakuita kwejasi panguva yekuvaka, asi zvakare inovandudza zvakanyanya kunaka kweiyo yekupedzisira coating. HPMC inovandudza mashandiro ejasi mune zvinotevera zvinhu:
Coating flatness: HPMC inovandudza rheology yejasi, inowedzera kupararira uye kuenzana kwejasi, uye inoita kuti iyo yekupfeka iite mushe uye yunifomu.
Kuramba kwemvura uye kuramba kwemamiriro ekunze: HPMC inoumba dense network chimiro mujasi, iyo inowedzera kudzivirira kwemvura uye anti-kuchembera kugona kwejasi, uye inovandudza kuramba kwemamiriro ekunze kwejasi.
Adhesion: HPMC inosimudzira kusungirirwa kwechifukidzo, kuitira kuti chifukidzo chive chakanyatsobatanidzwa nechepamusoro pe substrate, uye inovandudza kusimba kwekuputira.
4. Mienzaniso yekushandisa yeHPMC
4.1 Architectural coatings
Mumachira ekugadzira, HPMC inoshandiswa kuvandudza kupararira kwemavara uye rheology yejasi, kunyanya yemvura-yakavakirwa machira. HPMC inovandudza kugadzikana uye kuita kwekuvaka kwejasi, kuitira kuti iyo yekupfekedza ive nani kuenzana nekunamatira pamadziro, uye inodzivirira iyo firimu kubva pakudonha uye kusaenzana coating.
4.2 Industrial coatings
HPMC inoshandiswawo zvakanyanya mumaindasitiri ekupfeka. Haisi kungovandudza dispersibility yemavara, asiwo inovandudza kushanda kwekuvaka kwekuputira, zvichiita kuti firimu rekuputira riwedzere kuomerera kune simbi, plastiki uye mamwe ma substrates, uye iyo yakaumbwa yekuvhara firimu inogara yakasimba.
4.3 Mamwe machira
HPMC inoshandiswawo mumhando dzakasiyana-siyana dzakashongedzwa, dzakadai semagetsi ekudzivirira moto, anti-corrosion coatings, nezvimwe. nzvimbo dzakasiyana dzakaoma kunzwisisa.
Sechinhu chinoparadza, HPMC inoita basa rakakosha mukuvandudza dispersibility yepigment, kuvandudza rheology yejasi uye kugadzirisa mashandiro emafirimu ekuputira. Chimiro chayo chakasiyana uye basa rinopa huwandu hwakasiyana hwemashandisiro ekushandisa muindasitiri yekupfeka. Nekuvandudzwa kwetekinoroji yekupfekedza, kushandiswa kweHPMC kucharamba kuchiwedzera, kuchipa mikana yakawanda yekuvandudza uye hunyanzvi hwekuita coating.
Nguva yekutumira: Jun-25-2024