1. Ka tukuna te cellulose e te D-glucopyranose β- He pūmua rārangi i hangaia mā te hononga o ngā here 1,4 glycoside. He tino tioata te kiriuhi cellulose, ā, kāore e taea te whakakorikori i roto i te wai, te hanga rānei hei kiriuhi, nō reira me whakarerekē matū. Ko te hydroxyl kore utu i ngā tūranga C-2, C-3 me C-6 e whakarato ana i te mahi matū, ā, ka taea te tauhohenga waikura, te etherification, te esterification me te graft copolymerization. Ka taea te whakapai ake i te wairewa o te cellulose kua whakarerekētia, ā, he pai te mahi hanga kiriata.
2. I te tau 1908, i whakaritea e te kaimātai matū o Huiterangi, a Jacques Brandenberg, te kiriata cellulose tuatahi, hei arahi i te whanaketanga o ngā rauemi takai ngohengohe mārama hou. Mai i te tekau tau 1980, ka tīmata te iwi ki te ako i te cellulose kua whakarerekētia hei kiriata kai me te paninga. Ko te kiriuhi cellulose kua whakarerekētia he rauemi kiriuhi i hangaia mai i ngā hua i whiwhihia i muri i te whakarerekētanga matū o te cellulose. He kaha teitei te kume o tēnei momo kiriuhi, he ngāwari, he mārama, he ātete ki te hinu, kāore he kakara me te kore reka, ātete ki te wai me te hāora waenga.
3. Ka whakamahia te CMC i roto i ngā kai parai, pērā i ngā parai parai, hei whakaiti i te mimiti o te ngako. Ina whakamahia ngātahi me te konupūmā hauota, ka pai ake te pānga. He whānuitia te whakamahinga o te HPMC me te MC i roto i ngā kai kua whakamahanatia, inā koa i roto i ngā kai parai, nā te mea he tiēre wera ēnei. I Āwherika, ka whakamahia te MC, te HPMC, te pūmua kānga me te amylose hei aukati i te hinu kai i roto i ngā kai paraoa pīni whero parai hohonu, pērā i te rehu me te tuku i ēnei otinga rauemi mata ki runga i ngā pōro pīni whero hei whakarite i ngā kiriata kai. Ko te rauemi membrane MC kua tuku te mea tino whai hua i roto i te ārai hinu, ka taea te whakaiti i te mimiti hinu mā te 49%. I te nuinga o te wā, he iti ake te mimiti hinu e whakaatuhia ana e ngā tauira kua tuku i ngā tauira kua rehuhia.
4. MCme te HPMC e whakamahia ana hoki i roto i ngā tauira māngaro pērā i ngā pōro rīwai, te paraoa pokepoke, ngā maramara rīwai me te paraoa pokepoke hei whakapai ake i te mahi ārai, mā te rehu i te nuinga o te wā. E whakaatu ana te rangahau ko te MC te mea pai rawa atu hei aukati i te makuku me te hinu. Ko tōna kaha pupuri wai te take nui o tōna iti o te pai ki te wai. Mā te karuārai, ka kitea he pai te piri o te kiriata MC ki te kai parai. Kua whakaatuhia e ngā rangahau he pai te pupuri wai o te paninga HPMC i rehuhia ki runga i ngā pōro heihei, ā, ka taea te whakaiti i te nui o te hinu i te wā e parai ana. Ka taea te whakanui ake i te nui o te wai o te tauira whakamutunga mā te 16.4%, ka taea te whakaiti i te nui o te hinu mata mā te 17.9%, ā, ka taea te whakaiti i te nui o te hinu o roto mā te 33.7%. E pā ana te mahi a te hinu ārai ki te mahi ira wera oHPMCI te tīmatanga o te tiēre, ka tere te piki o te matotoru, ka tere te here i waenga i ngā ngota, ā, ka tiēre te wairewa i te 50-90 ℃. Ka taea e te paparanga tiēre te ārai i te hekenga o te wai me te hinu i te wā e parai ana. Mā te tāpiri i te hauwaiwai ki te paparanga o waho o ngā poro heihei parai kua toua ki roto i ngā kongakonga taro ka taea te whakaiti i te raruraru o te tukanga whakarite, ā, ka taea hoki te whakaiti i te mimiti hinu o te uma heihei, me te pupuri i ngā āhuatanga motuhake o te tauira.
5. Ahakoa he rauemi kiriata kai pai te HPMC, he pai ōna āhuatanga miihini me te ātete ki te kohu wai, he iti noa iho tōna wāhi mākete. E rua ngā āhuatanga e whakawhāiti ana i tōna whakamahinga: tuatahi, he kirikiri wera, arā, he kirikiri totoka viscoelastic i hangaia i te pāmahana teitei, engari kei roto i te otinga he tino iti te matotoru i te pāmahana rūma. Nō reira, me whakamahana te matrix me te whakamaroke i te pāmahana teitei i te wā o te tukanga whakarite. Ki te kore, i te wā o te paninga, te rehu, te tuku rānei, ka ngawari te rere o te otinga ki raro, ka hanga he rauemi kiriata kāore i te ōrite, ka pā ki te mahi a ngā kiriata kai. Hei tāpiri, me whakarite e tēnei mahi kia noho te awheawhe whakaputa katoa ki runga ake i te 70 ℃, ka moumou nui te wera. Nō reira, me whakaiti tōna ira kirikiri, me whakanui rānei tōna matotoru i te pāmahana iti. Tuarua, he tino utu nui, tata ki te 100000 yuan/tana.
Wā tuku: Paenga-whāwhā-26-2024