N'ebe adhesives ụlọ ọrụ mmepụta ihe, ọchịchọ maka ihe ndị na-enye arụmọrụ dị elu, nkwado gburugburu ebe obibi, na ọnụ ahịa bara uru bụ ihe kacha mkpa. N'ime ihe dị iche iche a nyochara, starch ethers apụtawo dị ka ihe dị mkpa na-enye aka na-emeziwanye ihe nrapado. Starch ethers, nke ewepụtara na starch eke, na-enweta mgbanwe kemịkalụ iji kwalite akụrụngwa anụ ahụ na kemịkal ha, na-eme ka ha dabara nke ọma maka ngwa ụlọ ọrụ dị iche iche.
Ịghọta Starch Ethers
Starch, polysaccharide nke mejuputara nkeji glucose, bụ ihe enwere ike imeghari na ihe na-emebi emebi nke a na-ejikarị na ụlọ ọrụ dị iche iche. Otú ọ dị, starch obodo nwere ụfọdụ njedebe, dị ka nghọta na iru mmiri, njedebe dị oke na mmiri oyi, na ọchịchọ nke retrograde (recrystallize), nke na-egbochi ngwa ya na nrapado. Iji merie ihe ndọghachi azụ ndị a, a na-emezi starch na kemịkal iji mepụta ether starch.
A na-etolite ethers starch site na iwebata otu ether (alkyl ma ọ bụ otu hydroxyalkyl) n'ime molekul starch. Mgbanwe a na-eme ka solubility, nkwụsi ike, na ihe na-emepụta ihe nkiri nke starch, na-eme ka ọ dịkwuo mma maka iji ya mee ihe na adhesives. Ụdị starch ethers ndị a na-ahụkarị gụnyere hydroxyethyl starch (HES), hydroxypropyl starch (HPS), na carboxymethyl starch (CMS).
Njikọ nke Starch Ethers
Ngwakọta nke starch ethers na-agụnye usoro mmeghachi omume kemịkalụ ebe a na-eji ihe na-eme ka starch eme ihe. Dịka ọmụmaatụ, a na-emepụta stachi hydroxypropyl site n'imeghachi starch na propylene oxide, ebe a na-emepụta starch carboxymethyl site na iji monochloroacetic acid. Ogo nke nnọchi (DS), nke na-egosi nkezi ọnụọgụ hydroxyl dị na molekul starch nke ether nọchiri anya ya, na-arụ ọrụ dị oke mkpa n'ịchọpụta njirimara nke ether starch na-arụpụta.
Mmelite na Njirimara Nrapado
Starch ethers na-eweta ọtụtụ nkwalite na nrapado nke ngwaahịa ụlọ ọrụ:
Mmụba Solubility na njikwa viscosity: Mwebata nke otu ether na-eme ka mmiri solubility nke starch ethers dịkwuo mma, na-enye ha ohere igbari na ma mmiri oyi na mmiri ọkụ. Ngwongwo a dị oke mkpa maka adhesives ka ọ na-eme ka ngwa ngwa na ịdị n'otu. Ọzọkwa, viscosity nke starch ether ngwọta nwere ike ịchịkwa site n'ịgbanwe ogo nke nnọchi, na-eme ka adhesives na kpọmkwem rheological Njirimara.
Mgbakwunye na njikọta emelitere: Starch ethers na-egosipụta nrapado ka mma n'ụdị dị iche iche, gụnyere akwụkwọ, osisi, textiles, na plastik. Nke a bụ n'ihi mmụba na mmekọrịta dị n'etiti ụmụ irighiri ihe starch emezigharịrị na ihe ndị dị n'ime ala. Tụkwasị na nke ahụ, a na-eme ka ike nchịkọta nke ihe nkiri ntanye na-eme ka ọ dịkwuo mma n'ihi nhazi nke otu netwọk polymer na-agbanwe agbanwe.
Nkwụsi ike na Nguzogide: Adhesives emepụtara na starch ethers na-egosipụta nkwụsi ike dị mma n'okpuru ọnọdụ gburugburu ebe obibi dịgasị iche iche. Ha na-egosipụta nguzogide iru mmiri, nke bụ uru dị ukwuu karịa nrapado starch nke ala nke na-ada mbà n'ọnọdụ mmiri. Nke a na-eme ka adhesives starch dabeere na ether dị mma maka ngwa ebe ikpughe na mmiri bụ nchegbu.
Biodegradability na Sustainability: Otu n'ime uru dị mkpa nke starch ethers bụ biodegradability ha. N'adịghị ka adhesives sịntetik ewepụtara site na petrochemicals, starch ether dabeere na adhesives bụ enyi na enyi gburugburu ebe obibi ma na-emebi emebi na ndammana, na-ebelata akara ukwu nke gburugburu ebe obibi. Nke a kwekọrọ na mmụba na-arịwanye elu maka ngwọta nrapado na-adịgide adịgide na akwụkwọ ndụ akwụkwọ ndụ na ụlọ ọrụ dị iche iche.
Ngwa ụlọ ọrụ mmepụta ihe
Ngwongwo emelitere nke starch ethers emeela ka nnabata ha zuru ebe niile na ngwa ụlọ ọrụ dị iche iche:
Ụlọ ọrụ mpempe akwụkwọ na nkwakọ ngwaahịa: A na-eji adhesives starch ether eme ihe n'ọtụtụ akwụkwọ na ụlọ ọrụ nkwakọ ngwaahịa n'ihi ike njikọ ha siri ike na biodegradability. A na-eji ha eme ihe maka imepụta bọọdụ corrugated, lamination akwụkwọ, yana dịka onye na-ejikọ ọnụ na ngwaahịa akwụkwọ.
Ịrụ osisi na arịa ụlọ: N'ebe a na-arụ osisi na ngwá ụlọ, starch ether adhesives na-enye njikọ siri ike ma na-adịgide adịgide. Nkwụsi ike nke mmiri ha dị mma na-aba uru karịsịa maka ijikọ ihe ndị e ji osisi rụọ nke nwere ike ikpughe na ọkwa iru mmiri dị iche iche.
Textiles: A na-eji starch ethers na ụlọ ọrụ textiles maka nha na imecha ngwa. Ngwongwo adhesion emelitere na-eme ka a mata na eriri na-ejikọta ya nke ọma, na-eme ka mma na ịdịte aka nke ngwaahịa textile ikpeazụ.
Ihe owuwu: N'ebe a na-ewu ihe owuwu, a na-eji starch ether eme ihe maka mkpuchi mgbidi, ala ala, na ihe mgbakwunye na ciment na plasta. Ikike ha iji kwalite ihe nrapado nke ihe owuwu ihe na-enye aka n'iguzosi ike n'ezi ihe na ịdị ogologo nke ụlọ.
Ụlọ ọrụ nri: A na-ejikwa ether starch emezigharịrị na ụlọ ọrụ nri dị ka ihe na-ekekọta na ihe na-eme ka ọ dị arọ na ngwaahịa ndị dị ka mkpuchi, ekpomeekpo mkpuchi, na nrapado oriri. Nchekwa ha na biodegradaability na-eme ka ha dị mma maka ojiji na ngwa ndị metụtara nri.
Ọdịnihu na ihe ịma aka
Ọdịnihu nke starch ethers na nrapado ụlọ ọrụ na-ele anya na-ekwe nkwa, na-akpali site na ọchịchọ na-aga n'ihu maka ihe ndị na-adigide na ọganihu na usoro mgbanwe kemịkal. A lekwasịrị anya nyocha n'ịzụlite ụdị starch ethers ọhụrụ nwere akụrụngwa ahaziri maka ngwa akọwapụtara. Ihe ọhụrụ dị na usoro njikọ na-achọ ịkwalite arụmọrụ nke usoro mgbanwe, belata ọnụ ahịa, na ibelata mmetụta gburugburu ebe obibi.
Agbanyeghị, enwere nsogbu ị ga-edozi. Arụmọrụ nke starch ether dabeere adhesives nwere ike imetụta isi iyi na mma nke ala starch, nke dịgasị iche iche na ọrụ ugbo. Ịhụ na ịdị mma na ịrụ ọrụ nke ngwaahịa ikpeazụ chọrọ njikwa siri ike na ngwa ngwa na usoro mmepụta ihe. Na mgbakwunye, ebe starch ethers bụ ihe na-emebi emebi, a ga-enyocharịrị mmetụta gburugburu ebe obibi zuru oke nke mmepụta na mkpofu ha iji hụ na ha nọgidere bụrụ nhọrọ na-adigide n'ezie.
Starch ethers agbanweela ngalaba nke nrapado ụlọ ọrụ site n'inye nchikota arụmọrụ emelitere yana uru gburugburu ebe obibi. Ọdịmma ha emelitere, nrapado, nkwụsi ike, na biodegradability na-eme ka ha bụrụ ihe ọzọ mara mma na nrapado sịntetik ọdịnala. Ka ụlọ ọrụ na-aga n'ihu na-ebute nkwado nkwado, ọrụ nke starch ethers na ngwa nrapado ka atọrọ ịgbasa, nke nyocha na-aga n'ihu na ọganihu nkà na ụzụ na-akwalite. Ihe ịma aka a dị n'ịkwalite mmepụta na ngwa ha iji bulie uru ma na-ebelata ihe ndọghachi azụ ọ bụla, na-ahụ na starch ethers nọgidere bụrụ isi nkuku nke ngwọta nrapado enyi na enyi n'ọdịnihu.
Oge nzipu: Jun-04-2024