Ii-starch ethers luhlobo oluguquliweyo lwesitatshi oluye lwafumana ingqwalasela ebanzi kwiindlela ezahlukeneyo zokusebenza kwemizi-mveliso ngenxa yokuguquguquka kwazo kunye neempawu zazo ezikhethekileyo. Nangona isetyenziswa kakhulu kwi-adhesives ngenxa yamandla ayo okubopha, ukufaneleka kwayo kwiindawo ezinobushushu obuphezulu kuxhomekeke kwizinto ezahlukeneyo.
1. Intshayelelo kwi-starch ether:
Ii-starch ethers zizinto ezivela kwi-starch yendalo, eziyi-polysaccharides ezifumaneka kwizityalo. Ngokusebenzisa utshintsho lweekhemikhali, oludla ngokubandakanya i-etherification, ii-starch ethers ziveliswa ukuphucula iipropati zazo kwaye zizenze zilungele ukusetyenziswa okuthile. Inkqubo yokuguqula itshintsha iipropati ze-hydrophilic kunye ne-hydrophobic ze-starch, ngaloo ndlela iphucula uzinzo, ukunyibilika kunye neepropati ze-rheological.
2. Iimpawu ze-starch ether:
Ii-starch ethers zineempawu eziphambili ezizenza zibe nomtsalane kwiintlobo ngeentlobo zezicelo zoshishino, kuquka nezincamathelisi. Ezi mpawu ziquka:
A. Ukunyibilika Ngamanzi: Ii-starch ethers ziyanyibilika emanzini kwaye zinokufakwa lula kwiifomyula zokuncamathelisa kwaye zikhuthaze iipropati ezilungileyo zokumanzisa.
b. Amandla okwenza ifilimu: Ii-starch ethers zinokwenza iifilimu ezinceda i-adhesive ukuba inamathele kumphezulu kwaye zinike amandla kwizinto ezinamathelayo.
C. I-Thickener: Isebenza njengesithambisi kwimixube yokuncamathelisa, ichaphazela i-viscosity kwaye iphucula iimpawu zokusetyenziswa.
d. Ukubola kwezinto eziphilayo: Ii-starch ethers zifumaneka kwizixhobo ezivuselelekayo kwaye ke ngoko zinobuhlobo nokusingqongileyo kwaye zifanelekile kwizicelo ezigxile ekuzinzeni.
3. Ukusetyenziswa kwe-starch ether enamathelayo:
Ii-starch ethers zingasetyenziswa kwiintlobo ngeentlobo ze-adhesive formulations, ezifana nezi:
A. Izincamathelisi zephepha kunye nokupakisha: Ii-starch ethers zisetyenziswa kakhulu kwii-adhesive zephepha kunye nokupakisha ngenxa yeempawu zazo zokwenza ifilimu kunye nokuncamathelisa.
b. Izincamathelisi zokwakha: Ukunyibilika kwamanzi kunye nokukwazi ukuqina kwe-starch ether kwenza ukuba ifaneleke ukusetyenziswa njengezincamathelisi zokwakha ukunceda ukubopha izixhobo zokwakha.
C. Izincamathelisi zoMthi: Kwishishini lokwenza imithi, ii-starch ethers zisetyenziswa kwizincamathelisi zomthi ukomeleza amandla okubopha kunye nokubonelela ngozinzo.
d. Izincamathelisi zelaphu: I-starch ether isetyenziswa kwizincamathelisi zelaphu ngenxa yokukwazi kwayo ukubopha imicu nokwandisa amandla elaphu ngokubanzi.
4. Ukusebenza kwindawo enobushushu obuphezulu:
Kwizicelo apho kudibana khona amaqondo obushushu aphezulu, ukusebenza kwee-starch ethers kwiindawo ezinobushushu obuphezulu yinto ebalulekileyo ekufuneka iqwalaselwe. Kukho izinto ezininzi ezichaphazela indlela ezisebenza ngayo kule meko:
A. Uzinzo lobushushu: Ii-starch ethers zibonisa amazinga ahlukeneyo ozinzo lobushushu ngokuxhomekeke kwinqanaba lazo lokutshintsha kunye notshintsho oluthile lweekhemikhali olusetyenziswayo ngexesha lenkqubo ye-etherification.
b. Ubushushu beGelatinization: Ubushushu beGelatinization yeStarch ether yiparameter ephambili kwizicelo zobushushu obuphezulu kwaye iya kuchaphazeleka bubunzima bayo bemolekyuli kunye nenqanaba lokutshintshwa kwayo.
C. Utshintsho kwi-viscosity: Amaqondo obushushu aphezulu anokutshintsha i-viscosity yeefomyula ze-adhesive ezine-starch ethers. Ukuqonda olu tshintsho kubalulekile ukuqinisekisa ukusebenza kwe-adhesive rhoqo.
d. Amandla eBond: Amandla ebond eefomyula eziqulethe i-starch ethers anokuchaphazeleka bubushushu, ngoko ke kufuneka ukuqonda ngokupheleleyo iimfuno ezithile zokusetyenziswa.
5. Icebo lokuguqula uzinzo lobushushu obuphezulu:
Ukuze kuphuculwe ukusetyenziswa kwe-starch ether kwiindawo ezinobushushu obuphezulu, kungasetyenziswa ezi ndlela zilandelayo zokuguqula:
A. Ukudibanisa okunqamlezileyo: Iimolekyuli ze-ether zesitatshi ezidibanisa okunqamlezileyo zonyusa uzinzo lobushushu kunye nokumelana notshintsho lwe-viscosity olubangelwa bubushushu.
b. Ukudibanisa neepolymers ezimelana nobushushu: Ukudibanisa ii-starch ethers kunye neepolymers ezimelana nobushushu kunokwenza iifomyula ze-hybrid adhesive ezigcina uzinzo kumaqondo obushushu aphezulu.
C. Utshintsho lweekhemikhali: Utshintsho olongezelelweyo lweekhemikhali, olufana nokungeniswa kwamaqela asebenzayo angatshisi ubushushu, lunokuhlolwa ukuze kulungiselelwe ii-starch ethers kwizicelo ezithile zobushushu obuphezulu.
6. Izifundo zetyala kunye nokusetyenziswa kwazo:
Ukuhlola izifundo zeemeko zehlabathi lokwenyani kunye nokusetyenziswa okusebenzayo kubonelela ngengqiqo ebalulekileyo malunga nokusebenza kwee-starch ethers kwiindawo ezinobushushu obuphezulu. Amashishini apho ukumelana nobushushu kubaluleke kakhulu, njengeemoto, i-aerospace kunye ne-elektroniki, anokubonelela ngemizekelo exabisekileyo.
7. Izinto eziqwalaselwayo malunga nokusingqongileyo:
Njengoko iinkxalabo zokusingqongileyo zisiba zibaluleke ngakumbi, ukubola kwee-starch ethers kongeza inzuzo ebalulekileyo. Ukuvavanya impembelelo yokusingqongileyo yeefomyula zokuncamathelisa ezine-starch ethers kwizicelo zobushushu obuphezulu kwizenzo ezizinzileyo.
8. Izikhokelo zexesha elizayo kunye namathuba ophando:
Uphando oluqhubekayo nophuhliso kwicandelo lokuguqulwa kwe-starch ether kunokuvula amathuba amatsha okusetyenziswa kwayo kwiindawo ezinobushushu obuphezulu. Ukuhlola iindlela ezintsha zokuguqulwa, ukuqonda iindlela ezisisiseko zokuzinza kobushushu, kunye nokuchonga ukusebenzisana nezinye iipolymers ziindawo ezifanelekileyo zophando.
9. Isiphelo:
Ngamafutshane, ii-starch ethers zizinto ezithembisayo zokusetyenziswa kwe-adhesive, zineempawu ezahlukeneyo ezinqwenelekayo. Ukusebenza kwazo kwiindawo ezinobushushu obuphezulu kuxhomekeke ekuqwalaselweni ngononophelo kwezinto ezinje ngokuzinza kobushushu, ubushushu be-gelatinization kunye namandla e-bond. Ngokusebenzisa utshintsho olucwangcisiweyo kunye neendlela ezintsha zokwenziwa, ii-starch ethers zinokulungiswa ukuze zijongane nemingeni ethile ebangelwa kubushushu obuphezulu, zivule iindlela ezintsha zokusetyenziswa kwazo kumashishini apho ukumelana nobushushu kubalulekile khona. Njengoko uphando luqhubeka, indima yee-starch ethers kwizicelo ze-adhesive isenokukhula, iqinise isikhundla sayo njengezithako ze-adhesive ezinokuguquguquka nezizinzileyo.
Ixesha lokuthumela: Disemba-02-2023