Starch ether bụ okwu n'ozuzu maka klas nke starches gbanwetụrụ nwere ether bonds na molecule, makwaara dị ka etherified starch, nke a na-ejikarị na nkà mmụta ọgwụ, nri, textile, mpempe akwụkwọ, kemịkalụ kwa ụbọchị, mmanụ ala na ụlọ ọrụ ndị ọzọ. Taa, anyị na-akọwakarị ọrụ starch ether na ngwa agha.
Okwu Mmalite na Starch Ether
Ndị a na-ejikarị eme ihe bụ starch nduku, starch tapioca, starch ọka, ọka wit, wdg. E jiri ya tụnyere ọka ọka ọka nwere abụba dị elu na protein protein, mgbọrọgwụ osisi starch dị ka nduku na tapioca starch dị ọcha.
Starch bụ polysaccharide macromolecular mejupụtara nke glucose. Enwere ụdị molekul abụọ, linear na alaka, nke a na-akpọ amylose (ihe dịka 20%) na amylopectin (ihe dịka 80%). Iji meziwanye njirimara starch eji eme ihe eji eme ihe, enwere ike iji usoro anụ ahụ na nke kemịkalụ gbanwee ya iji mee ka ihe onwunwe ya dịkwuo mma maka ebumnuche dị iche iche nke ihe owuwu ụlọ.
Starch nke etherified gụnyere ụdị ngwaahịa dị iche iche. Dị ka carboxymethyl starch ether (CMS), hydroxypropyl starch ether (HPS), hydroxyethyl starch ether (HES), cationic starch ether, wdg. A na-ejikarị hydroxypropyl starch ether.
Ọrụ nke hydroxypropyl starch ether na ngwa agha
1) Mee ka ngwa agha ahụ sie ike, mụbaa mgbochi-sagging, mgbochi-sagging na rheological Njirimara nke ngwa agha ahụ.
Dịka ọmụmaatụ, n'ịrụ ihe mkpuchi tile, putty, na plasta mortar, karịsịa ugbu a na n'ibu spraying na-achọ nnukwu mmiri mmiri, dị ka na gypsum dabeere na ngwa agha, ọ dị mkpa karịsịa (gypsum na-efesa igwe na-achọ nnukwu mmiri mmiri ma ọ ga-eme ka ọ dị njọ. , starch Ether nwere ike mejupụta maka ụkọ a).
Mmiri mmiri na nguzogide sag na-emegidekarị, na ịba ụba mmiri ga-eduga n'ibelata nguzogide sag. Mortar na rheological Njirimara nwere ike dozie esemokwu dị otú ahụ nke ọma, ya bụ, mgbe a na-etinye ike mpụga, viscosity na-ebelata, na-eme ka arụ ọrụ na-arụ ọrụ na pumpability dịkwuo mma, na mgbe a na-ewepụ ike mpụga, viscosity na-abawanye na nkwụsị nke sagging na-akawanye mma.
Maka ihe na-eme ugbu a na-abawanye ebe tile, ịgbakwụnye starch ether nwere ike imeziwanye nkwụghachi nke nrapado taịlị.
2) Ogologo oge mmeghe
Maka adhesives tile, ọ nwere ike imezu ihe achọrọ nke ihe mkpuchi tile pụrụ iche (Klas E, 20min gbatịpụrụ ruo 30min iji ruo 0.5MPa) na-agbatị oge mmeghe.
Njirimara elu emelitere
Starch ether nwere ike ime ka elu nke gypsum base na ciment mortar dị nro, dị mfe itinye, ma nwee mmetụta ịchọ mma. Ọ bara uru nke ukwuu maka plasta ngwa agha na akwa oyi akwa ịchọ mma dị ka putty.
Usoro ọrụ nke hydroxypropyl starch ether
Mgbe ether starch gbazere n'ime mmiri, a ga-agbasasị ya n'otu n'otu na simenti ngwa ngwa simenti. Ebe ọ bụ na starch ether molecule nwere usoro netwọkụ ma na-ebubo ya n'ụzọ na-ezighị ezi, ọ ga-anakọta mkpụrụ osisi ciment nke ọma ma na-eje ozi dị ka àkwà mmiri ngbanwe iji jikọọ ciment, si otú ahụ na-enye uru mkpụrụ buru ibu nke slurry nwere ike imeziwanye mgbochi sag ma ọ bụ mgbochi-slip. mmetụta.
Ọdịiche dị n'etiti hydroxypropyl starch ether na cellulose ether
1. Starch ether nwere ike imeziwanye ihe mgbochi sag na mgbochi nke ngwa agha
Cellulose ether na-enwekarị ike imeziwanye viscosity na njigide mmiri nke usoro ahụ ma ọ nweghị ike imeziwanye ihe mgbochi na-adịghị mma.
2. Thickening na viscosity
N'ozuzu, viscosity nke cellulose ether bụ ihe dị ka iri puku kwuru iri puku, ebe viscosity nke starch ether dị ọtụtụ narị na ọtụtụ puku, ma nke a apụtaghị na starch ether nwere ike ikuku-enraining onwunwe, mgbe starch ether enweghị ihe ikuku-entraing onwunwe. .
5. Ọdịdị molekụla nke cellulose ether
Ọ bụ ezie na starch na cellulose bụ ihe mejupụtara molekul glucose, ụzọ ha si emepụta dị iche. Ntuzi aka nke mkpụrụ ndụ glucose niile dị na starch bụ otu, ebe nke cellulose bụ ihe dị iche, na ntụzịaka nke molekul glucose ọ bụla dị n'akụkụ dị iche. Ọdịiche nhazi a na-ekpebikwa ọdịiche dị na njirimara cellulose na starch.
Oge nzipu: Eprel-10-2023