Plastik kanea a ɛma hann no gyina hɔ no yɛ ade a ebetumi asiw hann a ɛresɛe wɔ plastic so no ano anaasɛ ayɛ mmerɛw na ama hann a ɛko tia plastic nneɛma no atu mpɔn.
Wɔn mu dodow no ara tumi twetwe mframa a ano yɛ den, enti wɔsan frɛ no ultraviolet absorbers. Ultraviolet rays a ɛwɔ owia hann mu no ne ade titiriw nti a onyin nya nneɛma a ɛyɛ polymer so nkɛntɛnso. Ɛwom sɛ ultraviolet hann anya owia hann bɛyɛ 5% de, nanso n’ahoɔden yɛ kɛse paa. N’ahoɔden no dɔɔso sɛ ɛbɛma nnuru a ɛwɔ polymer no mu no abubu, abubu na abɔ molecule nkɔnsɔnkɔnsɔn no mu, na ama ne mfiridwuma mu nneɛma ayɛ nsakrae bɔne. Bere koro no ara mu no, ne kɔla nso sesa.
Sɛnea ɔkwan a wɔfa so yɛ adwuma no kyerɛ no, wobetumi akyekyɛ mu ayɛ no 1) hann a ɛbɔ ho ban, 2) UV absorber, 3) quencher, ne 4) free radical trap.
1) Hann a ɛbɔ ho ban: Ne dwumadi te sɛ nea ɛde akwanside bi si polymer ne hann mframa no ntam, sɛnea ɛbɛyɛ a hann no rentumi nkɔ polymer no mu tẽẽ, sɛnea ɛbɛyɛ a ultraviolet mframa renpira polymer no mu, na ɛnam so asiw photooxidation ano yiye. Nneɛma a wɔsɛe no.
2) Ultraviolet absorber: Nea ɛyɛ adwuma ne sɛ ɛbɛtwe ultraviolet hann a ɛyɛ mmerɛw a ɛwɔ polymer no mu no denneennen, na ebetumi adan ahoɔden no ayɛ ɔhyew ahoɔden a asiane biara nni ho.
3) quencher: Ɛbɛtumi agye ahoɔden a chromophore no twetwe wɔ plastic no mu no atom, na ɛma ahoɔden no yɛ radiate wɔ ɔhyew, fluorescence anaa phosphorescence mu de san kɔ base material no mu, na ɛnam so bɔ polymer no ho ban fi UV sɛe no ho.
4) Free radical trapping agent: Saa hann a ɛma ɛyɛ den yi betumi afiri free radicals a ɛyɛ adwuma a ɛba wɔ polymer no mu no afiri, na ɛnam so asiw photooxidation nhyehyɛe no ano na ama hann no atumi agyina.
Plastik hann a ɛma ɛyɛ den[1] no, ɛnyɛ sɛ wɔde adi dwuma wɔ rɔba, nneɛma a wɔde kata so, ne nnuru a wɔde yɛ nhama mu nko, na mmom ɛwɔ abakɔsɛm a ɛfa mfe aduanan kosi aduonum ho wɔ hann a ɛma nneɛma yɛ den a wɔde di dwuma wɔ plastic nnwuma mu, titiriw ma ABS resin ne polyformaldehyde. . afoforo te sɛ polyamide, polycarbonate, a wɔde acrylate resin di dwuma nso.
Ɛnyɛ sɛ plastic kanea a ɛma nneɛma gyina hɔ no tumi bɔ nneɛma no ankasa ho ban nko, na mmom ɛyɛ nneɛma a wɔde kyekyere nneɛma a ɛyɛ mmerɛw sɛ mframa a ano yɛ den te sɛ nnuru bɛka no nso. food etc. nso wɔ ahobanbɔ tumi pa. Enti, Light Stabilizers benya nkɔso ho anidaso a ɛtrɛw wɔ plastic adwumayɛ mu.
