I-Methyl Hydroxyethyl Cellulose (MHEC)

I-Methyl Hydroxyethyl Cellulose (MHEC) yi-ether ye-cellulose eqhelekileyo. Ifunyanwa nge-etherification ye-cellulose kwaye isetyenziswa ikakhulu kumashishini amaninzi afana nokwakha, amayeza, izinto zokuthambisa, kunye nokutya. I-MHEC ine-solubility efanelekileyo yamanzi, ukuqina, ukumiswa, kunye neempawu zokudibanisa, kwaye iyongezo ebaluleke kakhulu esebenzayo.

1. Ukwakhiwa kweekhemikhali kunye nokulungiselela

1.1 Ubume bekhemikhali

I-MHEC ifunyenwe nge-methylation inxalenye kunye ne-hydroxyethylation ye-cellulose. Ubume balo beekhemikhali zenziwa ngokuyinhloko ngokutshintshwa kweqela le-hydroxyl kwi-cellulose ye-molecular chain nge-methyl (-CH₃) kunye ne-hydroxyethyl (-CH₂CH₂OH). Ifomyula yayo yesakhiwo idla ngokuchazwa ngolu hlobo:

Iseli−��−����3+Iseli−��−����2����Iseli−O−CH 3+O−CH 2+O2

Iseli imele i-cellulose molecular skeleton. Iqondo lokutshintshwa kwamaqela e-methyl kunye ne-hydroxyethyl ichaphazela iimpawu ze-MHEC, ezifana ne-solubility yamanzi kunye ne-viscosity.

1.2 Inkqubo yamalungiselelo

Amalungiselelo e-MHEC ikakhulu abandakanya la manyathelo alandelayo:

Ukusabela kwe-Etherification: Ukusebenzisa i-cellulose njengento ekrwada, iphathwa okokuqala ngesisombululo se-alkaline (njenge-sodium hydroxide) ukuze kusebenze amaqela e-hydroxyl kwi-cellulose. Emva koko i-methanol kunye ne-ethylene oxide zongezwa ukwenza i-etherification reaction ukuze amaqela e-hydroxyl kwi-cellulose athathelwe indawo ngamaqela e-methyl kunye ne-hydroxyethyl.

I-Neutralization kunye nokuhlamba: Emva kokuba i-reaction igqityiwe, i-alkali engaphezulu isuswe yi-acid neutralization reaction, kwaye imveliso yokusabela ihlanjwa ngokuphindaphindiweyo ngamanzi ukuze isuse iimveliso kunye nezixhobo ezingasetyenziswanga.

Ukomisa kunye nokutyumza: Ukumiswa kwe-MHEC ehlanjiweyo yomile ukufumana i-MHEC powder, kwaye ekugqibeleni icolile ukuze ifumane ukucokiseka okufunekayo.

2. Iimpawu zomzimba kunye neekhemikhali

2.1 Imbonakalo kunye nokunyibilika

I-MHEC ngumgubo omhlophe okanye okhanyayo otyheli onyibilika ngokulula kumanzi abandayo nashushu, kodwa une-solubility ephantsi kwii-solvents eziphilayo. I-solubility yayo ihambelana nexabiso le-pH yesisombululo, kwaye ibonisa ukunyibilika okulungileyo kwi-neutral ukuya kuluhlu olubuthakathaka lwe-asidi.

2.2 Ukujiya nokunqunyanyiswa

I-MHEC inokunyusa kakhulu i-viscosity yesisombululo emva kokuchithwa emanzini, ngoko isetyenziswa ngokubanzi njenge-thickener. Ngelo xesha, i-MHEC nayo inokumiswa kakuhle kunye ne-dispersibility, enokuthi ithintele i-particle sedimentation, eyenza isetyenziswe njenge-agent yokumisa kwiingubo kunye nezinto zokwakha.

2.3 Uzinzo kunye nokuhambelana

I-MHEC ine-asidi efanelekileyo kunye nokuzinza kwe-alkali kwaye inokugcina ukuzinza kwayo kwi-pH ebanzi. Ukongezelela, i-MHEC inokunyamezela okulungileyo kwi-electrolytes, eyenza ukuba isebenze kakuhle kwiinkqubo ezininzi zeekhemikhali.

3. Iinkalo zesicelo

3.1 Ishishini lokwakha

Kwintsimi yokwakha, i-MHEC isetyenziswa kakhulu njenge-thickener kunye ne-arhente yokugcina amanzi kwizinto ezifana nodaka, i-putty kunye ne-gypsum. I-MHEC inokuphucula ngokufanelekileyo ukusebenza kwezixhobo zokwakha, ukwandisa ukubambelela kunye neempawu ezichasene ne-anti-sagging ngexesha lokwakha, ukwandisa ixesha elivulekileyo, kwaye ngexesha elifanayo liphucule ukugcinwa kwamanzi kwezinto zokuthintela ukuqhekeka kunye nokunciphisa amandla okubangelwa ukulahleka kwamanzi ngokukhawuleza.

3.2 Izithambiso

I-MHEC isetyenziswa njenge-emulsifier, i-thickener, kunye ne-stabilizer kwi-cosmetics. Iyakwazi ukunika izimonyo ukuthintela okulungileyo kunye ne-rheology, ukwandisa ukuzinza kunye nokusetyenziswa kwamava emveliso. Ngokomzekelo, kwiimveliso ezifana ne-lotions, i-creams, kunye ne-shampoos, i-MHEC inokuthintela ngokufanelekileyo i-stratification kunye nemvula kunye nokwandisa i-viscosity yemveliso.

3.3 Ishishini lezamayeza

Kwishishini lamachiza, i-MHEC isetyenziswa njenge-binder, i-agent-release-release, kunye ne-ejenti yokumisa iipilisi. Inokuphucula ubunzima kunye nokuchithwa kweempawu zeepilisi kunye nokuqinisekisa ukukhululwa okuzinzile kwamachiza. Ukongezelela, i-MHEC iphinda isetyenziswe ngokuqhelekileyo kumachiza amisiweyo ekuncedeni izithako ezisebenzayo zihlakazeke ngokulinganayo kunye nokuphucula ukuzinza kunye ne-bioavailability yamachiza.

3.4 Ishishini lokutya

Kwishishini lokutya, i-MHEC isetyenziswa kakhulu njenge-thickener kunye ne-stabilizer, kwaye ifanelekile kwiintlobo ezahlukeneyo zokutya, njengemveliso yobisi, i-sauces, i-condiments, njl. ukutya.

4. UKhuseleko lweNdalo kunye noKhuseleko

4.1 Ukusebenza kokusingqongileyo

I-MHEC ine-biodegradability elungileyo kwaye akukho ngcoliseko lucacileyo lokusingqongileyo. Ekubeni iinqununu zayo eziphambili ziyi-cellulose kunye ne-derivatives yayo, i-MHEC inokunciphisa ngokuthe ngcembe kwizinto ezingenabungozi kwindawo yendalo kwaye ayiyi kubangela ukulimala kwexesha elide kumhlaba kunye namanzi.

4.2 Ukhuseleko

I-MHEC inokhuseleko oluphezulu kwaye ayinayo ityhefu kwaye ayinabungozi kumzimba womntu. Xa isetyenziswe kwi-cosmetics kunye namashishini okutya, kufuneka ihambelane nemigangatho efanelekileyo yokhuseleko kunye nemimiselo yokuqinisekisa ukuba umxholo we-MHEC kwimveliso ungaphakathi koluhlu oluchaziweyo. Ngethuba lokusetyenziswa, kufuneka kuthathelwe ingqalelo ukukhusela ukuphefumla ubuninzi bothuli ukuphepha ukucaphuka kokuphefumula.

5. IiNdlela zoPhuhliso lwexesha elizayo

5.1 UkuPhuculwa koMsebenzi

Olunye lwezalathiso zophando lwexesha elizayo lwe-MHEC kukuphucula ngakumbi ukusebenza kwayo ngokuphucula inkqubo yokudibanisa kunye noyilo lwefomula. Ngokomzekelo, ngokunyusa izinga lokutshintshwa kunye nokuphucula isakhiwo se-molecular, i-MHEC ingaba nokusebenza okungcono kwiimeko ezikhethekileyo zesicelo, ezifana nokuchasana nokushisa okuphezulu, i-asidi kunye nokuxhatshazwa kwe-alkali, njl.

5.2 Ukwandiswa kwesicelo

Ngophuhliso oluqhubekayo lwezixhobo ezintsha kunye neenkqubo ezintsha, intsimi yesicelo se-MHEC kulindeleke ukuba yandise ngakumbi. Ngokomzekelo, kwintsimi yamandla amatsha kunye nezinto ezintsha, i-MHEC, njengesongezo esisebenzayo, inokudlala indima ebalulekileyo.

5.3 Ukhuseleko lokusingqongileyo kunye nozinzo

Ngokuphuculwa kolwazi lwendalo esingqongileyo, ukuveliswa kunye nokusetyenziswa kwe-MHEC kuya kuphuhliswa kwakhona ngendlela ehambelana nokusingqongileyo kunye nesikhokelo esizinzileyo. Uphando lwexesha elizayo lunokujolisa ekunciphiseni ukukhutshwa kwenkunkuma kwinkqubo yokuvelisa, ekuphuculeni ukonakaliswa kwemveliso yezinto eziphilayo, kunye nokuphuhlisa iinkqubo zemveliso eluhlaza.

I-Methyl hydroxyethyl cellulose (MHEC), njenge-multifunctional cellulose ether, inethuba elibanzi lokusetyenziswa kunye namandla ophuhliso. Ngophando olunzulu malunga neekhemikhali zayo kunye nokuphucula iteknoloji yesicelo, i-MHEC iya kudlala indima ebaluleke kakhulu kumashishini ahlukeneyo kwaye ifake isandla ekuphuculeni ukusebenza kwemveliso kunye nokukhuselwa kwendalo. Kwixesha elizayo lezinto zesayensi kunye nobunjineli, ukusetyenziswa kwe-MHEC kuya kuzisa izinto ezintsha kunye nokuphumelela.