Hydroxypropyl Starch Ether yog dab tsi?

Hydroxypropyl starch ether (HPS) yog cov hmoov txhuv nplej siab hloov pauv uas tau nrov zuj zus hauv ntau qhov kev lag luam ua cov thickening, stabilizing, thiab emulsifying tus neeg sawv cev. Nws yog cov dej-soluble carbohydrate derivative uas yog muab los ntawm tej yam ntuj tso pob kws, qos yaj ywm, los yog tapioca starch los ntawm ib tug tshuaj hloov kho txheej txheem uas koom nrog cov kev taw qhia ntawm hydroxypropyl pawg rau cov starch molecules.

Kev siv HPS tau dhau los ua neeg nyiam hauv kev lag luam zaub mov vim nws txhim kho kev ntxhib los mos, qhov ncauj qhov ntswg, thiab txee lub neej ntawm ntau yam khoom noj. Nws yog feem ntau siv hauv cov kua zaub, kua ntses, gravies, paj npleg, thiab lwm yam khoom uas yuav tsum tau ua kom tuab lossis ruaj khov. HPS kuj tseem siv rau hauv kev lag luam tshuaj los txhim kho kev xa tshuaj, nrog rau hauv cov tshuaj pleev ib ce thiab cov khoom tu tus kheej xws li tshuaj zawv plaub hau, tshuaj pleev, thiab tshuaj pleev.

Hauv tsab xov xwm no, peb yuav tshawb xyuas cov khoom, txheej txheem tsim khoom, kev siv, thiab kev saib xyuas kev nyab xeeb ntawm HPS.

Cov khoom ntawm Hydroxypropyl Starch Ether

Hydroxypropyl hmoov txhuv nplej siab ether yog cov hmoov dawb, tsis muaj ntxhiab, thiab tsis qab ntsev uas yog soluble hauv dej thiab lwm cov kuab tshuaj polar. Nws muaj qhov hnyav molecular li ntawm 1,000 txog 2,000,000 Daltons, nyob ntawm seb qhov kev hloov pauv ntawm pawg hydroxypropyl. Qhov degree ntawm kev hloov pauv (DS) yog hais txog qhov nruab nrab ntawm cov hydroxypropyl pawg per anhydroglucose unit (AGU) hauv cov hmoov txhuv nplej siab. Qhov siab dua DS ua rau muaj ntau dua hydrophilic thiab dej-soluble HPS molecule.

HPS muaj nyob rau hauv ntau qib, nyob ntawm seb nws viscosity, particle loj, thiab lwm yam khoom. Lub viscosity ntawm HPS feem ntau yog qhia nyob rau hauv cov nqe lus ntawm nws Brookfield viscosity, uas yog ntsuas nyob rau hauv centipoise (cP) ntawm ib tug tshwj xeeb shear tus nqi thiab kub. Higher-viscosity HPS qib yog siv rau cov khoom thicker, thaum qis-viscosity qib yog siv rau cov khoom nyias.

Qhov loj me me ntawm HPS kuj yog ib qho khoom tseem ceeb, vim nws cuam tshuam rau nws cov dispersibility thiab flowability. HPS muaj nyob rau hauv ntau qhov sib txawv, xws li cov hmoov zoo rau granules, nyob ntawm daim ntawv thov.

Kev tsim cov txheej txheem ntawm Hydroxypropyl Starch Ether

Kev tsim khoom ntawm HPS suav nrog kev hloov pauv ntawm cov hmoov txhuv nplej siab uas siv cov tshuaj tiv thaiv ntawm cov hmoov txhuv nplej siab thiab propylene oxide (PO), uas qhia cov pab pawg hydroxypropyl rau cov hmoov txhuv nplej siab. Cov txheej txheem feem ntau yog ua tiav hauv cov kua dej aqueous alkaline, nrog rau kev sib ntxiv ntawm cov khoom siv xws li sodium hydroxide lossis potassium hydroxide.

Cov txheej txheem hloov kho yog cuam tshuam los ntawm ntau yam, xws li lub sijhawm tshuaj tiv thaiv, qhov kub thiab txias, pH, PO / starch ratio, thiab catalyst concentration. Cov xwm txheej no cuam tshuam rau qib kev hloov pauv, qhov hnyav molecular, thiab lwm yam khoom ntawm HPS cov khoom lag luam.

Cov hmoov txhuv nplej siab hloov pauv yog ces ntxuav, neutralized, thiab qhuav kom tau cov hmoov dawb los yog granules. Cov khoom HPS tom qab ntawd raug kuaj rau ntau yam khoom xws li viscosity, particle loj, noo noo, thiab purity.

Kev siv ntawm Hydroxypropyl Starch Ether

Kev siv HPS hauv kev tsim kho muaj txiaj ntsig zoo hauv ntau txoj hauv kev, xws li kev txhim kho lub zog thiab ua haujlwm ntev ntawm cov pob zeb, txo cov ntsiab lus dej, thiab txhim kho qhov adhesion thiab cohesion ntawm mortars. Qee qhov kev siv ntawm HPS hauv kev tsim kho yog:

1. Pob zeb:

HPS yog siv rau hauv pob zeb ua cov dej reducer, uas txo cov dej uas xav tau rau kev sib xyaw tsim. Qhov no ua rau muaj zog dua thiab ua haujlwm ntev ntawm cov pob zeb, vim cov dej ntau dhau tuaj yeem ua rau cov pob zeb tsis muaj zog thiab ua rau tawg tawg. HPS kuj tseem txhim kho kev ua haujlwm thiab kev ntws ntawm cov pob zeb, uas muaj txiaj ntsig zoo hauv cov haujlwm loj.

2. Mortar:

HPS yog siv nyob rau hauv mortar li ib tug plasticizer, uas txhim kho lub workability thiab sib xws ntawm lub mortar. Qhov no ua rau muaj kev sib raug zoo ntawm cov mortar thiab cov masonry units, uas yog ib qho tseem ceeb rau kev ncaj ncees ntawm lub tsev. HPS kuj txo cov dej hauv cov mortar, uas txhim kho nws lub zog thiab kav ntev.

3. Gypsum khoom:

HPS yog siv rau hauv cov khoom siv gypsum xws li plaster thiab sib koom ua ke ua cov thickener thiab stabilizer. Qhov no ua rau muaj kev sib haum xeeb thiab zoo sib xws ntawm cov khoom siv gypsum, nrog rau kev txhim kho adhesion thiab cohesion. HPS kuj tseem txhim kho lub sijhawm teeb tsa thiab lub zog ntawm cov khoom siv gypsum, uas yog qhov muaj txiaj ntsig zoo hauv kev tsim kho.

Ntxiv nrog rau cov ntawv thov saum toj no, HPS kuj tseem tuaj yeem siv rau hauv lwm cov ntaub ntawv hauv tsev xws li txheej txheej, nplaum, thiab sealants. Kev siv HPS hauv kev tsim kho tuaj yeem txhim kho qhov zoo, kev ua tau zoo, thiab kev ruaj khov ntawm kev tsim kho, nrog rau txo nqi thiab pov tseg.