Hydroxypropyl methylcellulose (HPMC) ipolymer inoshandiswa zvakasiyana-siyana ine zvakasiyana-siyana zvekushandisa mumaindasitiri akasiyana-siyana, kusanganisira mishonga, chikafu, kuvaka, uye cosmetics. Paunenge uchifunga nezve kupisa kwayo, zvakakosha kuti uongorore maitiro ayo maererano nekuchinja kwekushisa, kugadzikana kwekushisa, uye chero zviitiko zvine hukama.
Thermal Kugadzikana: HPMC inoratidza kugadzikana kwakanaka kwekushisa pamusoro pehupamhi hwekushisa. Iyo inowanzoora pakupisa kwakanyanya, kazhinji pamusoro pe200 ° C, zvichienderana nehuremu hwayo hwemamorekuru, dhigirii rekutsiva, uye zvimwe zvinhu. Iyo yekusvibisa maitiro inosanganisira kutsemuka kweiyo cellulose musana uye kuburitswa kwezvinhu zvinoputika zvekuora zvigadzirwa.
Girazi Transition Temperature (Tg): Kufanana nemapolymer mazhinji, HPMC inopinda girazi shanduko kubva kune girazi kuenda kune rubbery state nekuwedzera tembiricha. Iyo Tg yeHPMC inosiyana zvichienderana nehuwandu hwayo hwekutsiva, huremu hwemamorekuru, uye hunyoro hwemukati. Kazhinji, inotangira pa50°C kusvika 190°C. Pamusoro peTg, HPMC inowedzera kushanduka uye inoratidza kuwedzera kwema molecular kufamba.
Melting Point: Yakachena HPMC haina yakasarudzika yekunyungudika nekuti ndeye amorphous polymer. Zvisinei, inopfava uye inogona kuyerera pane tembiricha yakakwirira. Kuvapo kwezvinowedzera kana kusvibiswa kunogona kukanganisa maitiro ayo ekunyunguduka.
Thermal Conductivity: HPMC ine yakaderera kupisa conductivity kana ichienzaniswa nesimbi uye mamwe mapolymers. Ichi chivakwa chinoita kuti chikodzere maapplication anoda kupisa kwemafuta, senge mumapiritsi emishonga kana zvekuvaka.
Kuwedzera kweThermal: Kufanana nemapolymer mazhinji, HPMC inowedzera kana yapiswa uye makondirakiti kana yatonhodzwa. Iyo coefficient of thermal expansion (CTE) yeHPMC inoenderana nezvinhu zvakaita semugadzirirwo wayo wemakemikari uye mamiriro ekugadzirisa. Kazhinji, ine CTE muhuwandu hwe100 kusvika 300 ppm/°C.
Heat Capacity: Kupisa simba kweHPMC kunokonzerwa neiyo molecular chimiro, dhigirii rekutsiva, uye hunyoro hwemukati. Kazhinji inotangira pa1.5 kusvika pa2.5 J/g°C. Madhigirii epamusoro ekutsiva uye kunyorova kwemukati kunowedzera kuwedzera kupisa kugona.
Thermal Degradation: Kana yakafumurwa kune tembiricha yakakwira kwenguva yakareba, HPMC inogona kusangana nekupisa kwekupisa. Iyi nzira inogona kuguma nekuchinja kwemakemikari ayo, zvichiita kuti kurasikirwa kwezvinhu zvakadai seviscosity uye simba remagetsi.
Thermal Conductivity Enhancement: HPMC inogona kugadziridzwa kuti iwedzere kupisa kwayo conductivity kune chaiyo maapplication. Kubatanidza mafirita kana ekuwedzera, senge simbi zvimedu kana kabhoni nanotubes, zvinogona kuvandudza kupisa kutamisa zvivakwa, zvichiita kuti ive yakakodzera kune thermal management application.
Zvishandiso: Kunzwisisa iyo inopisa zvivakwa zveHPMC kwakakosha pakugadzirisa mashandisiro ayo mumhando dzakasiyana dzekushandisa. Mumishonga yemishonga, inoshandiswa sebhainda, firimu rekare, uye rinogara richiburitswa mumiririri mukugadzirwa kwehwendefa. Mukuvaka, inoshandiswa mune simende-based zvinhu kuvandudza kushanda, kunamatira, uye kuchengetedza mvura. Muchikafu uye zvizorwa, inoshanda seyakakora, stabilizer, uye emulsifier.
Hydroxypropyl methylcellulose (HPMC) inoratidza huwandu hwezvinhu zvinopisa zvinoita kuti ive yakakodzera kushandiswa kwakasiyana mumaindasitiri. Kugadzikana kwayo kwekushisa, tembiricha yekuchinja kwegirazi, kupisa kwemhepo, uye humwe hunhu hunoita basa rakakosha pakuona kushanda kwayo munzvimbo dzakatarwa uye mashandisirwo. Kunzwisisa zvivakwa izvi kwakakosha pakushandiswa kunoshanda kweHPMC mune zvakasiyana zvigadzirwa uye maitiro.
Nguva yekutumira: Chivabvu-09-2024