Usoro mmepụta nke hydroxypropyl methylcellulose

N'ozuzu, na njikọta nkehydroxypropyl methylcellulose, a na-eji mmiri alkali na-agwọ cellulose owu a nụchara anụcha na 35-40°C maka ọkara awa, a pịpịa ya, a na-akụ mkpụrụ ndụ ihe nketa ahụ, ma mee ka ọ dị mma na 35°C, ka eriri alkali enwetara wee bụrụ nke a na-eme ka ọ dị na polymerized dị n'ime oke achọrọ. Tinye eriri alkali n'ime ketulu etherification, tinye propylene oxide na methyl chloride n'otu aka ahụ, wee mee ka ọ dị ọkụ na 50-80 ℃ ruo awa ise ruo nrụgide dị elu nke ihe dị ka 1.8 MPa. Mgbe ahụ, tinye oke kwesịrị ekwesị nke hydrochloric acid na oxalic acid na mmiri ọkụ na 90°C iji saa ihe ahụ iji gbasaa olu ya. Jiri centrifuge mee ka mmiri gwụ. Sachaa ruo mgbe ọ na-anọpụ iche, mgbe mmiri dị n'ime ihe ahụ erughị 60%, kpoo ya na ikuku ọkụ na 130°C ruo ihe na-erughị 5%.

Nhazi Alkalị: A na-etinye owu a gwakọtara agwakọta nke ọma mgbe emepechara ya n'ime ihe mgbaze na-adịghị agbanwe agbanwe, ma jiri alkali na mmiri dị nro rụọ ọrụ iji mee ka eriri kristal nke owu a gwakọtara agwakọta gbasaa, nke na-eme ka molekul ihe na-eme ka etherifying pụta ìhè ma na-eme ka mmeghachi omume etherification dịkwuo mma. Alkalị eji eme alkalị bụ hydroxide metal ma ọ bụ ntọala organic. Ọnụọgụ alkalị agbakwunyere (site na oke, otu ihe ahụ dị n'okpuru) bụ ugboro 0.1-0.6 nke owu a gwakọtara agwakọta, ọnụọgụ mmiri dị nro dịkwa ugboro 0.3-1.0 nke owu a gwakọtara agwakọta; ihe mgbaze inert bụ ngwakọta nke mmanya na hydrocarbon, ọnụọgụ nke ihe mgbaze inert agbakwunyere bụ owu a gwakọtara agwakọta. Ugboro 7-15: ihe mgbaze inert nwekwara ike ịbụ mmanya nwere atọm carbon 3-5 (dị ka mmanya, propanol), acetone. Ọ nwekwara ike ịbụ hydrocarbons aliphatic na hydrocarbons aromatic; a ga-achịkwa okpomọkụ n'ime 0-35°C n'oge alkalị; oge alkalị bụ ihe dị ka awa 1. Enwere ike ikpebi mgbanwe nke okpomọkụ na oge dịka ihe achọrọ na ngwaahịa na ngwaahịa si dị.

Ntucha: Mgbe a gbasịrị ọgwụ alkalization, n'ọnọdụ ikuku, a na-eme etherification site na itinye ihe na-eme ka ikuku dị ọcha, ihe na-eme ka ikuku dị ọcha bụ propylene oxide. Iji belata oriri nke ihe na-eme ka ikuku dị ọcha, a na-agbakwunye ihe na-eme ka ikuku dị ọcha ugboro abụọ n'oge usoro etherification.