Octocryleneyog ib qho organic compound, feem ntau yog siv los ua tshuaj pleev thaiv hnub, thiab nws cov tshuaj tiv thaiv tshuaj muaj raws li hauv qab no:
1. UV nqus:
Octocrylene tuaj yeem nqus tau UVB thiab UVA rays thiab ua lub luag haujlwm hauv tshuaj pleev thaiv hnub. Qhov siab tshaj plaws wavelength ntawm UVB nqus yog 310 nm, thiab qhov siab tshaj plaws wavelength ntawm UVA nqus yog 360 nm.
2. Cov tshuaj tiv thaiv oxidation:
Octocrylene yooj yim oxidized thiab tuaj yeem tsim cov diketone tebchaw los ntawm cov tshuaj tiv thaiv oxidation. Cov tshuaj tiv thaiv no feem ntau ua tiav nyob rau hauv lub teeb, thiab lub accelerator tuaj yeem yog cua, oxygen, hydrogen peroxide, thiab lwm yam.
3. Sib xyaw nrog lwm cov tshuaj pleev thaiv hnub:
Octocrylene tuaj yeem sib xyaw nrog lwm cov tshuaj pleev thaiv hnub los txhim kho cov tshuaj pleev thaiv hnub. Piv txwv li, nws tuaj yeem sib xyaw nrog titanium dioxide, zinc oxide thiab lwm yam khoom los tsim cov tshuaj pleev thaiv hnub zoo dua.
4. Cov tshuaj tiv thaiv thermal decomposition:
Octocrylene yog nquag rau decomposition cov tshuaj tiv thaiv nyob rau hauv kub kub tej yam kev mob los tsim cov khoom uas tsis muaj molecular hnyav, xws li formaldehyde, acetone thiab sulfuric acid.
5. Cov tshuaj tiv thaiv Esterification:
Octocrylene tuaj yeem cuam tshuam nrog cawv los tsim cov khoom esterification. Cov tshuaj tiv thaiv no feem ntau yog ua los ntawm cov kua qaub, thiab cov catalyst tuaj yeem yog sulfuric acid.
Raws li qhov tshwm sim, Octocrylene feem ntau yog siv los ua tshuaj pleev thaiv hnub. Nws cov tshuaj tiv thaiv tshuaj lom neeg feem ntau suav nrog ultraviolet absorption, oxidation cov tshuaj tiv thaiv, sib xyaw nrog lwm cov tshuaj pleev thaiv hnub, cov tshuaj tiv thaiv thermal decomposition thiab esterification cov tshuaj tiv thaiv. Ntawm lawv, cov tshuaj tiv thaiv oxidation thiab thermal decomposition cov tshuaj tiv thaiv tuaj yeem ua rau txo lossis poob ntawm nws cov tshuaj tiv thaiv tshav ntuj. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau nws qhov chaw cia thiab siv cov xwm txheej thaum siv.
Txoj kev synthesis ntawm Octocrylene feem ntau suav nrog cov kauj ruam hauv qab no:
1. Synthesis ntawm 4-methylbenzoic acid.
2. Synthesis ntawm 2-ethoxyethyl 4-methylbenzoate
3. Synthesis of 2-ethoxy-2-oxo-1,3,2-dioxane 6-ib
4. Synthesis ntawm 2-oxo-1,3,2-dioxocycloheptane-6-keto-4-carboxylate
5. Synthetic Octocrylene
Nov yog cov kauj ruam ntxaws:
1. Synthesis ntawm 4-methylbenzoic acid:
Benzaldehyde thiab acetone raug cua sov nyob rau hauv acidic tej yam kev mob los tsim 4-methylbenzoic acid.
2. Synthesis ntawm 2-ethoxyethyl 4-methylbenzoate:
Ethyl 4-methylbenzoate tau npaj los ntawm cov tshuaj tiv thaiv ntawm 4-methylbenzoic acid thiab ethanol nyob rau hauv acidic tej yam kev mob. Tom qab ntawd, ethyl 4-methylbenzoate reacts nrog ethylene glycol nyob rau hauv alkaline tej yam kev mob los tsim 2-ethoxyethyl 4-methylbenzoate.
3. Synthesis of 2-ethoxy-2-oxo-1,3,2-dioxane 6-ib:
2-ethoxyethyl 4-methylbenzoate reacted nrog sulfuric acid thiab acetylacetone ntawm qhov kub thiab txias los tsim 2-ethoxy-2-oxo-1,3,2-dioxocycloheptane{ {7}}ib.
4. Synthesis of 2-oxo-1,3,2-dioxocycloheptane-6-keto-4-carboxylate:
Cov tshuaj tiv thaiv ntawm 2-ethoxy-2-oxo-1,3,2-dioxocycloheptane-6-ib qho nrog formic acid nyob rau hauv alkaline tej yam kev mob tsim 2-oxo{{ 7}},3,2-dioxocycloheptane-6-ib-4-carboxylate.
5. Synthetic Octocrylene:
Cov 2-oxo-1,3,2-dioxocycloheptane-6-keto-4-carboxylate tau ua kom sov nyob rau hauv acidic tej yam kev mob los tsim Octocrylene.
Feem ntau, txoj kev sib txuas ntawm Octocrylene yog qhov nyuaj, thiab nws yuav tsum muaj ob peb kauj ruam kom tau txais cov khoom lag luam.
Octocrylene yog thawj zaug los ntawm cov kws tshawb fawb John H. Fowle III thiab James J. Leyden ntawm Hallstar Company hauv 1991. Thaum xub thawj, Octocrylene tau siv los ua hom tshiab ntawm ultraviolet absorber. Nws qhov zoo yog tias nws tuaj yeem muab kev tiv thaiv dav dav ntawm ultraviolet, thiab nws tuaj yeem txhim kho ib leeg thaum siv nrog rau lwm cov tshuaj ultraviolet absorbent formulations. Txij thaum ntawd los, Octocrylene tau siv dav hauv ntau yam tshuaj pleev ib ce, khoom tu tawv nqaij thiab tshuaj pleev thaiv hnub.
Nrog rau kev paub txog kev puas tsuaj ntawm ultraviolet rays rau ntawm daim tawv nqaij thiab kev saib xyuas los ntawm cov neeg siv khoom tiv thaiv ultraviolet, kev lag luam xav tau ntawm Octocrylene yog nce. Txhawm rau ua kom tau raws li kev xav tau ntawm kev lag luam, ntau lub tuam txhab tshuaj pleev ib ce thiab kho tawv nqaij tau pib siv Octocrylene ua ultraviolet absorber. Tam sim no, Octocrylene tau dhau los ua ib qho ntawm feem ntau siv ultraviolet absorbers, thiab nws daim ntawv thov nyob rau hauv ntau yam tshuaj pleev ib ce thiab cov khoom tu tawv nqaij kuj nce zuj zus.
Nws yuav tsum raug sau tseg tias nrog kev nthuav dav ntxiv ntawm daim ntawv thov ntawm Octocrylene, qee cov kws tshawb fawb tau pib ua qhov tsis ntseeg txog nws txoj kev nyab xeeb. Nws tau tshaj tawm tias Octocrylene tuaj yeem ua rau muaj kev tsis haum tshuaj, cuam tshuam rau cov kab mob endocrine thiab lwm yam teeb meem, yog li nws yuav tsum tau siv ua tib zoo thiab raws li kev qhia ntawm cov kws tshaj lij.