Adwinnade a ɛma UV absorbers yɛ adwuma .

Adwinnade a ɛma UV absorbers yɛ adwuma .
1. Nea enti a ultraviolet absorbers tumi twetwe ultraviolet hann ne sɛ saa nnuru yi molecules no wɔ afã abien: nhyehyɛe a ɛwɔ conjugated π electron nhyehyɛe no mu ne nhyehyɛe a etumi ma hydrogen atɔm ahorow no tu. Ɔfã a edi kan no nkutoo na ɛwɔ hɔ nso.
2. Anyɛ yiye koraa no, orthoxyl phenyl substituent biako na ɛwɔ ultraviolet absorber no nhyehyɛe molecule no mu. Wɔ saa aduru yi mu no, chelate ring yɛ ortho-hydroxyl ne nitrogen atom anaa oxygen atom. Bere a wɔatwe ultraviolet rays akyi no, hydrogen bond a ɛpaapae no ba isomerization, ɔhyew a ɛwɔ intramolecular structure no mu no ba, hydrogen bond no sɛe, chelating ring no bue, na intramolecular structure no sesa, sɛnea ɛbɛyɛ a ultraviolet hann a epira no bɛdan ɔhyew ahoɔden a ɛmma asiane biara nni ho, na ɛnam so abɔ nneɛma no ho ban.
3. Wɔ saa adeyɛ yi mu no, chelate ring a ɛba molecule no mu no ne ade titiriw a ɛma wotumi twetwe ultraviolet rays. Energy sensitive range a ɛbue saa ring yi yɛ ultraviolet ahoɔden a ɛyɛ 290-400nm wavelength no ara kwa.
4. Nea ɛka ho no, sɛ́ ultraviolet absorber no, ɛnsɛ sɛ ɛyɛ photochemical reactions wɔ ultraviolet hann anaa hann a wotumi hu no dwumadi ase; Ɛwɔ sɛnea nnuru ne nsu gyina yiye, na ɛma ɔhyew no gyina yiye; Ɛwɔ nsakrae a ɛba fam; Compatibility pa ne solvent extraction biara nni hɔ.
tebea horow a ɛsɛ sɛ UV absorbers yɛ .
1. Ɛtumi twetwe ultraviolet rays no denneennen (titiriw ne wavelength a ɛyɛ 290-400nm);
2. Ɔhyew a ɛyɛ den yiye, wɔ dwumadie mu mpo no, ɛrensesa ɛnam ɔhyew nti, na ɔhyew a ɛyɛ hyew no sua;
3. Nnuru a ɛyɛ den a ɛma ɛyɛ den, biribiara a ɛne nneɛma a ɛwɔ aduru no mu no ntumi nyɛ adwuma yiye;
4. Miscibility pa, wobetumi apete pɛpɛɛpɛ wɔ ade no mu, awɔw biara nni hɔ, nsu a ɛretu biara nni mu;
5. Photochemical stability a ɛwɔ absorbent no ankasa mu no ye, enni porɔwee, kɔla a ɛsakra;
6. kɔla a enni kɔla, ɛnyɛ awuduru, a ɛnyɛ huam;
7. a ɛko tia nsu a ɛbɛtɔ na ahohoro;
8. Ne bo yɛ mmerɛw na ɛnyɛ den sɛ wubenya;
9. Ɛntumi nhyew, anaasɛ ɛkame ayɛ sɛ ɛnyɛ nea ɛtumi nwura nsuo mu.