Cov hmoov txhuv nplej siab ethers yog ib qho kev hloov pauv ntawm cov hmoov txhuv nplej siab uas tau txais kev pom zoo nyob rau hauv ntau yam kev lag luam vim lawv muaj ntau yam thiab cov khoom tshwj xeeb. Thaum nws feem ntau siv rau hauv cov nplaum rau nws cov peev xwm sib txuas, nws qhov tsim nyog rau qhov chaw kub kub nyob ntawm ntau yam.
1. Taw qhia txog hmoov txhuv nplej siab ether:
Starch ethers yog derivatives ntawm ib txwm starch, uas yog polysaccharides pom nyob rau hauv cov nroj tsuag. Los ntawm kev hloov kho tshuaj, feem ntau cuam tshuam nrog etherification, hmoov txhuv nplej siab ethers yog tsim los txhim kho lawv cov khoom thiab ua rau lawv tsim nyog rau cov kev siv tshwj xeeb. Cov txheej txheem hloov pauv hloov cov khoom siv hydrophilic thiab hydrophobic ntawm cov hmoov txhuv nplej siab, yog li txhim kho stability, solubility thiab rheological zog.
2. Cov khoom ntawm starch ether:
Starch ethers muaj ntau yam khoom tseem ceeb uas ua rau lawv txaus nyiam rau ntau yam kev lag luam, nrog rau cov nplaum. Cov khoom no muaj xws li:
A. Dej Soluble: Cov hmoov txhuv nplej siab ethers yog cov dej soluble thiab tuaj yeem yooj yim muab tso rau hauv cov ntawv nplaum thiab txhawb cov khoom ntub dej zoo.
b. Film-forming peev xwm: Starch ethers tuaj yeem tsim cov yeeb yaj kiab uas pab cov nplaum nplaum rau saum npoo thiab muab lub zog rau cov khoom nplaum.
C. Thickener: Nws ua cov thickener nyob rau hauv daim ntawv nplaum, cuam tshuam viscosity thiab txhim kho cov yam ntxwv ntawm daim ntawv thov.
d. Biodegradability: Cov hmoov txhuv nplej siab ethers yog muab los ntawm cov khoom siv txuas ntxiv dua tshiab thiab yog li ntawd ib puag ncig tus phooj ywg thiab tsim nyog rau cov ntawv thov uas tsom mus rau kev ruaj khov.
3. Adhesive daim ntaub ntawv ntawm starch ether:
Cov hmoov txhuv nplej siab ethers tuaj yeem siv tau ntau yam ntawm cov nplaum nplaum, xws li:
A. Ntawv thiab ntim cov nplaum: Cov hmoov txhuv nplej siab ethers feem ntau yog siv rau hauv daim ntawv thiab ntim cov nplaum vim lawv cov yeeb yaj kiab tsim thiab cov khoom nplaum.
b. Kev tsim kho adhesives: Cov dej solubility thiab thickening peev xwm ntawm hmoov txhuv nplej siab ether ua rau nws haum rau siv raws li kev tsim kho adhesives los pab cov ntaub ntawv hauv tsev.
C. Ntoo Adhesives: Hauv kev lag luam woodworking, cov hmoov txhuv nplej siab ethers yog siv rau hauv cov nplaum ntoo los txhim kho kev sib raug zoo thiab kev ruaj ntseg.
d. Textile adhesives: Cov hmoov txhuv nplej siab ether yog siv rau hauv textile adhesives vim nws muaj peev xwm ua kom cov fibers thiab ua kom tag nrho lub zog ntawm cov ntaub.
4. Kev ua tau zoo nyob rau hauv qhov kub thiab txias ib puag ncig:
Rau cov ntawv thov uas muaj qhov kub thiab txias, qhov kev ua tau zoo ntawm cov hmoov txhuv nplej siab ethers hauv qhov chaw kub kub yog qhov tseem ceeb heev. Muaj ntau yam uas cuam tshuam rau nws tus cwj pwm hauv qhov no:
A. Thermal Stability: Cov hmoov txhuv nplej siab ethers muaj qhov sib txawv ntawm cov thermal stability nyob ntawm lawv qhov kev hloov pauv thiab cov kev hloov kho tshuaj tshwj xeeb siv thaum lub sij hawm etherification txheej txheem.
b. Gelatinization kub: Lub gelatinization kub ntawm starch ether yog ib qho tseem ceeb parameter nyob rau hauv high-temperature daim ntaub ntawv thiab yuav raug cuam tshuam los ntawm nws molecular hnyav thiab degree ntawm kev hloov.
C. Kev hloov pauv viscosity: Cov kub kub tuaj yeem hloov cov viscosity ntawm cov nplaum nplaum uas muaj cov hmoov txhuv nplej siab ethers. Kev nkag siab txog cov kev hloov pauv no yog qhov tseem ceeb los ua kom muaj kev ua tau zoo ntawm cov nplaum.
d. Bond Strength: Lub zog ntawm daim ntawv cog lus uas muaj cov hmoov txhuv nplej siab ethers tuaj yeem cuam tshuam los ntawm qhov kub thiab txias, yog li kev nkag siab zoo ntawm cov ntawv thov tshwj xeeb yuav tsum tau ua.
5. Kev hloov kho lub tswv yim rau kev kub siab stability:
Txhawm rau txhim kho qhov siv tau ntawm cov hmoov txhuv nplej siab ether hauv qhov kub thiab txias, cov tswv yim hloov kho hauv qab no tuaj yeem raug coj los siv:
A. Hla-txuas: Hla-txuas cov hmoov txhuv nplej siab ether molecules nce thermal stability thiab tsis kam mus rau qhov kub thiab txias viscosity hloov.
b. Kev sib xyaw nrog cov khoom siv hluav taws xob tiv thaiv hluav taws xob: Kev sib xyaw cov hmoov txhuv nplej siab ethers nrog cov khoom siv hluav taws xob tiv thaiv hluav taws xob tuaj yeem tsim cov nplaum nplaum nplaum uas muaj kev ruaj ntseg ntawm qhov kub thiab txias.
C. Kev hloov kho tshuaj: Kev hloov kho tshuaj ntxiv, xws li kev qhia txog cov pab pawg ua haujlwm kub-tiv taus, tuaj yeem tshawb nrhiav los txiav cov hmoov txhuv nplej siab ethers rau cov ntawv thov kub.
6. Cov ntaub ntawv tshawb fawb thiab kev siv tswv yim:
Kev tshuaj xyuas cov ntaub ntawv tshawb fawb hauv ntiaj teb tiag tiag thiab cov ntaub ntawv siv tau muab kev nkag siab zoo rau kev ua haujlwm ntawm cov hmoov txhuv nplej siab ethers hauv qhov chaw kub kub. Kev lag luam uas kub tsis kam yog qhov tseem ceeb, xws li automotive, aerospace thiab electronics, tuaj yeem muab cov piv txwv tseem ceeb.
7. Kev xav txog ib puag ncig:
Raws li kev txhawj xeeb ib puag ncig tau dhau los ua qhov tseem ceeb, biodegradability ntawm starch ethers ntxiv qhov txiaj ntsig tseem ceeb. Kev ntsuas qhov cuam tshuam ib puag ncig ntawm cov nplaum nplaum uas muaj cov hmoov txhuv nplej siab ethers hauv cov ntawv thov kub kub rau kev coj ua.
8. Cov lus qhia yav tom ntej thiab cov hauv kev tshawb fawb:
Kev tshawb fawb txuas ntxiv thiab kev txhim kho hauv kev hloov pauv ntawm cov hmoov txhuv nplej siab ether tuaj yeem qhib qhov muaj peev xwm tshiab rau nws daim ntawv thov nyob rau hauv qhov chaw kub kub. Tshawb nrhiav cov tswv yim hloov kho tshiab, nkag siab txog cov txheej txheem hauv qab ntawm thermal stability, thiab txheeb xyuas kev sib koom ua ke nrog lwm cov polymers yog qhov tsim nyog ntawm kev tshawb nrhiav.
9. Xaus:
Hauv cov ntsiab lus, cov hmoov txhuv nplej siab ethers tau cog lus rau cov neeg sib tw rau cov ntawv nplaum, muaj ntau yam khoom tsim nyog. Nws qhov kev ua tau zoo nyob rau hauv qhov kub thiab txias ib puag ncig yog nyob ntawm kev ua tib zoo xav txog yam xws li thermal stability, gelatinization kub thiab daim ntawv cog lus lub zog. Los ntawm kev hloov kho cov tswv yim thiab cov qauv tsim tshiab, cov hmoov txhuv nplej siab tuaj yeem tsim kho los daws cov teeb meem tshwj xeeb uas tshwm sim los ntawm qhov kub thiab txias, qhib txoj hauv kev tshiab rau lawv siv hauv kev lag luam uas kub tsis kam yog qhov tseem ceeb. Raws li kev tshawb fawb txuas ntxiv mus, lub luag haujlwm ntawm cov hmoov txhuv nplej siab ethers hauv daim ntawv thov nplaum yuav nthuav dav, ntxiv dag zog rau lawv txoj haujlwm ua ntau yam khoom siv nplaum thiab ruaj khov.
Post lub sij hawm: Dec-02-2023