Focus on Cellulose ethers

Etherification ụkpụrụ sịntetik nke Hydroxypropyl Methyl Cellulose (HPMC)

Hydroxypropyl methylcellulose (HPMC), raw cellulose, nwere ike nụchara anụcha owu ma ọ bụ osisi pulp, ọ dị ezigbo mkpa na-egwepịa ya tupu alkalization ma ọ bụ n'oge alkalization, na-echipịakwa bụ site n'ibu ike Bibie mkpokọta Ọdịdị nke cellulose akụrụngwa iji belata ogo nke cellulose. crystallinity na polymerization, na-abawanye ebe elu ya, si otú ahụ na-emeziwanye ohere na ike mmeghachi omume nke mmeghachi omume reagent na atọ hydroxyl otu na glucose mgbanaka nke cellulose macromolecule.

A na-eji Hydroxypropyl methylcellulose (HPMC) mee ihe dị ka akụrụngwa akụrụngwa iji mepụta mmanụ, nke nwere ike ịghọta ojiji nke mkpokọta shuga, meziwanye ọnụego ojiji nke akụrụngwa, belata ihe fọdụrụ nke mkpụrụ n'ime efere gbaa ụka, ma belata ọnụ ahịa mmiri mkpofu. ọgwụgwọ. Nke a hydroxypropyl methylcellulose Njirimara nke methylcellulose na-eme ka njikarịcha nke batch, nri-ogbe na usoro ịgba ụka na-aga n'ihu, na-ezere usoro nsogbu dị ka ịchịkwa ihe mejupụtara nke ọkara na ọnụọgụ dilution; ọ dịkwa mma maka ịhazi usoro ịgba ụka. Ebe ọ bụ na arụmọrụ nke hydroxypropyl methylcellulose (HPMC) yiri ndị ọzọ mmiri-soluble ethers, ọ nwere ike ji mee ihe na latex agba na mmiri-soluble resin agba components dị ka a film-akpụ gị n'ụlọnga, thickener, emulsifier na stabilizer, wdg The film nwere. ezigbo nguzogide iyi, nhazi na nrapanye, ma mee ka esemokwu elu dị elu, nkwụsi ike na acid na alkali, na ndakọrịta na pigmenti dara.

Etherification sịntetik

Hydroxypropyl methylcellulose (HPMC) nwere mmetụta dị mma dị ka onye na-agba agba maka agba polyvinyl acetate na-acha ọcha. Ogo nke nnọchi nke cellulose ether na-abawanye, a na-akwalitekwa nguzogide nje bacteria.

Ọ bụ ezie na ụkpụrụ etherification synthesis nke hydroxypropyl methyl cellulose (HPMC) adịghị mgbagwoju anya, ọ dị mkpa ka a na-eme ka ọ bụrụ alkalized, ihe ọkụkụ na-egweri, na alkalized. Ebe ọ bụla nke etherification, mgbake mgbaze, centrifugation, ịsacha na ihicha gụnyere ọnụ ọgụgụ dị ukwuu nke isi teknụzụ na ihe ọmụma bara ụba.

Maka ụdị ngwaahịa dị iche iche, gburugburu ebe obibi ọ bụla nwere ọnọdụ nchịkwa kachasị ọhụrụ, dị ka okpomọkụ, oge, nrụgide na nchịkwa ihe. Ngwa inyeaka na ngwa njikwa bụ nkwa dị mma maka ịdị mma ngwaahịa kwụsiri ike na sistemụ nrụpụta ntụkwasị obi.


Oge nzipu: Dec-15-2022
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