Starch ethers na cellulose ethers bụ ma ethers na-arụ ọrụ dị mkpa na ụlọ ọrụ dị iche iche, karịsịa na-ewu na dị ka ihe mgbakwunye na ngwaahịa dị iche iche. Ọ bụ ezie na ha nwere ụfọdụ myirịta, ha bụ ogige dị iche iche nwere ụdị kemịkal dị iche iche, ihe onwunwe na ngwa.
1.Chemical Ọdịdị:
Starch ether:
A na-enweta starch ethers site na starch, polysaccharide nke mejupụtara nkeji glucose. Ọdịdị kemịkalụ nke starch nwere ihe abụọ bụ isi: amylose (agbụ nke mkpụrụ ndụ glucose na-ejikọta ya na njikọ α-1,4-glycosidic) na amylopectin (nwere α-1,4 na α-1,6- polymers nke nwere njikọ glycosidic). ) kọntaktị. A na-enweta Starch ethers site n'ịgbanwe otu hydroxyl nke starch site na usoro etherification.
Cellulose ether:
Cellulose, n'aka nke ọzọ, bụ polysaccharide ọzọ, mana nhazi ya nwere nkeji glucose jikọtara ya na njikọ β-1,4-glycosidic. A na-enweta cellulose ethers site na cellulose site na usoro etherification yiri ya. Ejikọtara nkeji ugboro ugboro na cellulose site na njikọ beta, na-akpụ usoro ahịrị na kristal nke ukwuu.
2. Isi mmalite:
Starch ether:
Starch na-esite na osisi dịka ọka, ọka wit na poteto. Osisi ndị a bụ ebe nchekwa starch na starch ethers nwere ike ịwepụta ma hazie ya.
Cellulose ether:
Cellulose bụ isi akụkụ nke mgbidi cell osisi ma dị ebe niile na okike. Isi mmalite nke cellulose na-agụnye pulp osisi, owu, na eriri osisi dị iche iche. A na-emepụta ethers cellulose site n'ịgbanwe mkpụrụ ndụ cellulose ewepụtara na ebe ndị a.
3. Usoro etherification:
Starch ether:
Usoro etherification nke starch gụnyere iwebata otu ether n'ime otu hydroxyl (OH) dị na mkpụrụ ndụ starch. Otu ether nkịtị agbakwunyere gụnyere methyl, ethyl, hydroxyethyl, na hydroxypropyl, na-ebute mgbanwe na njirimara nke starch emezigharịrị.
Cellulose ether:
Etherification nke cellulose gụnyere usoro yiri nke ahụ nke ether dị iche iche na-abanye n'ime ìgwè hydroxyl nke cellulose. Mwepụta nke cellulose ether a na-ahụkarị gụnyere methylcellulose, ethylcellulose, hydroxyethylcellulose na carboxymethylcellulose.
4. Solubility:
Starch ether:
Starch ether n'ozuzu nwere obere mmiri solubility karịa cellulose ethers. Dabere na otu ether akọwapụtara n'oge mgbanwe, ha nwere ike igosipụta ogo dị iche iche nke solubility.
Cellulose ether:
A maara ethers cellulose maka ihe ndị na-agbaze mmiri ma ọ bụ na-ekesa mmiri. Solubility dabere na ụdị na ogo nke nnọchi ether.
5. Ịrụ ihe nkiri:
Starch ether:
Starch ether n'ozuzu nwere oke ime ihe nkiri n'ihi ọdịdị nke ọkara kristal ha. Ihe nkiri a na-esi na ya pụta nwere ike ịbụ nke na-enweghị nghọta na nke na-adịghị agbanwe agbanwe karịa ihe nkiri sitere na cellulose ethers.
Cellulose ether:
Cellulose ethers, karịsịa ụfọdụ usoro dị ka methylcellulose, bụ ndị a maara maka ọmarịcha ihe na-emepụta ihe nkiri. Ha nwere ike ịmepụta ihe nkiri doro anya ma na-agbanwe agbanwe, na-eme ka ha baa uru na ngwa ndị dị ka mkpuchi na nrapado.
6.Rheological Njirimara:
Starch ether:
Starch ethers nwere ike ịbawanye viscosity nke mmiri mmiri ngwọta, ma ha rheological omume nwere ike ịdị iche na cellulose ethers. Mmetụta dị na viscosity na-adabere na ihe ndị dị ka ogo nke nnọchi na ịdị arọ molecular.
Cellulose ether:
A na-amatakarị ethers cellulose maka ike njikwa rheology ha. Ha nwere ike imetụta viscosity nke ukwuu, njide mmiri na ihe ndị na-asọpụta na ngwa dị iche iche gụnyere agba, nrapado na ihe owuwu.
7. Ngwa:
Starch ether:
Enwere ike iji starch ethers na nri, textile na ụlọ ọrụ ọgwụ. N'ime ụlọ ọrụ ihe owuwu, a na-eji ngwa agha, plasta na adhesives kwalite ihe ndị dị ka njide mmiri na ịrụ ọrụ.
Cellulose ether:
A na-ejikarị ethers cellulose eme ihe na ọgwụ, nri, ihe ịchọ mma na ogige ihe owuwu. A na-ejikarị ha eme ihe dị ka ndị na-agbapụta, stabilizers na rheology modifiers na agba, ngwa agha, adhesives tile na ụdị dị iche iche.
8. Mmebi ndụ:
Starch ether:
Starch ethers sitere na osisi ma bụrụ nke a na-enwekarị ike imebi. Ha na-enyere aka ịbawanye nkwado nke ngwaahịa eji eme ihe.
Cellulose ether:
Cellulose ethers ewepụtara na cellulose osisi bụkwa ihe na-emebi emebi. Ndakọrịta gburugburu ebe obibi ha bụ isi uru na ngwa ebe nkwado dị mkpa.
na ngwụcha:
Ọ bụ ezie na starch ethers na cellulose ethers na-ekerịta ụfọdụ ihe ndị a na-ahụkarị dị ka ihe mmepụta nke polysaccharide, ụdị kemịkalụ ha pụrụ iche, isi mmalite, solubility, ihe ndị na-emepụta ihe nkiri, omume rheological na ngwa na-ekewapụ ha maka iji mee ihe n'ubi dị iche iche. Starch ethers sitere na starch na cellulose ethers nke sitere na cellulose nke ọ bụla nwere uru pụrụ iche na ọnọdụ dị iche iche. Ịghọta ọdịiche ndị a dị oke mkpa maka ịhọrọ ether ziri ezi maka otu ngwa ngwa, na-eme ka arụmọrụ dị mma na njirimara achọrọ.
Oge nzipu: Jan-25-2024