Kev npaj thiab lub cev muaj zog ntawm hydroxypropyl starch ether

Hydroxypropyl starch ether (HPStE) yog npaj los ntawm kev hloov kho tshuaj lom neeg uas koom nrog kev qhia cov pab pawg hydroxypropyl mus rau cov hmoov txhuv nplej siab. Txoj kev npaj feem ntau suav nrog cov kauj ruam hauv qab no:

1. Kev xaiv cov hmoov txhuv nplej siab: Cov hmoov txhuv nplej siab zoo, feem ntau muab tau los ntawm cov chaw xws li pob kws, nplej, qos yaj ywm, lossis tapioca, raug xaiv los ua cov khoom pib. Qhov kev xaiv ntawm cov hmoov txhuv nplej siab tuaj yeem cuam tshuam cov khoom ntawm HPStTE khoom kawg.
2. Kev npaj ntawm Starch Paste: Cov hmoov txhuv nplej siab uas tau xaiv tau muab tso rau hauv dej los tsim cov hmoov txhuv nplej siab. Cov muab tshuaj yog rhuab mus rau ib tug tshwj xeeb kub kom gelatinize cov hmoov txhuv nplej siab granules, tso cai rau kom zoo reactivity thiab nkag mus rau reagents nyob rau hauv lub tom ntej no kev hloov kho cov kauj ruam.
3. Etherification Reaction: Cov hmoov txhuv nplej siab gelatinized yog tom qab ntawd ua haujlwm nrog propylene oxide (PO) nyob rau hauv muaj cov catalyst nyob rau hauv kev tswj xyuas. Propylene oxide reacts nrog cov hydroxyl pawg (-OH) ntawm cov hmoov txhuv nplej siab, uas ua rau kev sib txuas ntawm hydroxypropyl pawg (-OCH2CH(OH)CH3) rau cov pob txha pob txha.
4. Neutralization thiab Purification: Tom qab cov tshuaj tiv thaiv etherification, cov tshuaj tiv thaiv sib tov yog neutralized kom tshem tawm cov reagents ntau dhau los yog catalysts. Lub resulting hydroxypropyl starch ether yog ces purified los ntawm cov txheej txheem xws li pom, ntxuav, thiab ziab kom tshem tawm impurities thiab residual tshuaj.
5. Particle Size Adjustment: Lub cev muaj zog ntawm HPStE, xws li particle loj thiab kev faib tawm, tuaj yeem hloov kho los ntawm kev sib tsoo lossis kev sib tsoo kom ua tiav cov yam ntxwv xav tau rau cov ntawv thov tshwj xeeb.

Cov khoom ntawm lub cev ntawm hydroxypropyl starch ether tuaj yeem sib txawv nyob ntawm seb yam xws li qib kev hloov pauv (DS), qhov hnyav molecular, qhov loj me, thiab kev ua haujlwm. Qee lub cev muaj zog ntawm HPStE suav nrog:

1. Cov tsos mob: HPStE feem ntau yog cov hmoov dawb mus rau cov hmoov dawb nrog cov khoom loj me me. Lub particle morphology yuav txawv ntawm kheej kheej mus rau cov duab tsis zoo nyob ntawm cov txheej txheem tsim khoom.
2. Particle Loj: Qhov loj me me ntawm HPStE tuaj yeem nyob ntawm ob peb micrometers mus rau kaum micrometers, nrog rau kev cuam tshuam loj ntawm nws cov dispersibility, solubility, thiab functionality nyob rau hauv ntau yam kev siv.
3. Bulk Density: Qhov ntau ntom ntom ntawm HPStE cuam tshuam rau nws cov flowability, tuav cov yam ntxwv, thiab ntim khoom. Nws feem ntau ntsuas hauv grams ib cubic centimeter (g / cm³) lossis kilograms ib liter (kg / L).
4. Solubility: HPStE yog insoluble nyob rau hauv dej txias tab sis muaj peev xwm disperse thiab o nyob rau hauv dej kub, tsim viscous tov los yog gels. Lub solubility thiab hydration zog ntawm HPStE yuav txawv nyob ntawm seb yam xws li DS, molecular hnyav, thiab kub.
5. Viscosity: HPStE nthuav tawm thickening thiab rheological tswj cov khoom nyob rau hauv aqueous systems, cuam tshuam lub viscosity, ntws tus cwj pwm, thiab stability ntawm formulations. Lub viscosity ntawm HPStE cov kev daws teeb meem yog nyob ntawm cov yam xws li concentration, kub, thiab shear rate.
6. Tus nqi dej: Tus nqi dej ntawm HPStE yog hais txog tus nqi uas nws nqus dej thiab swells los ua cov kua nplaum lossis cov gels. Cov cuab yeej no yog qhov tseem ceeb hauv cov ntawv thov uas yuav tsum tau hydration sai thiab thickening.

Kev npaj thiab lub cev muaj zog ntawm hydroxypropyl starch ether yog tsim los ua kom tau raws li cov kev thov tshwj xeeb thiab cov qauv kev ua tau zoo, ua rau nws muaj ntau yam thiab muaj txiaj ntsig zoo ntxiv hauv ntau yam lag luam thiab cov qauv tsim.