Nneɛma a esiw phenolic antioxidants a esiw ano no yɛ nnuru a ɛwɔ benzene ring no hydroxyl kuw no afã biako anaa abien no nyinaa. Sɛnea phenolic dwumadi akuw dodow a esiw kwan wɔ ne molecule mu no kyerɛ no, wɔtaa kyekyɛ mu ma ɛyɛ phenolic biako a esiw kwan ne multi-asiw phenolic ano. Wɔ saa asɛm yi mu no, yɛbɛkyerɛkyerɛ ɔkwan a wɔfa so siw phenolic antioxidants ano no bɔ polymers ho ban.
Dɛn ne ɔkwan a wɔfa so yɛ polymer onyin?
Bere a wɔde di dwuma anaasɛ wɔde sie no, polymers betumi ayɛ nea ɛsɛe ade esiane ɔhyew, hann, ozone oxidation anaa dade ion catalysis nti. Afei nneɛma a ɛwɔ aduru no mu no so tew, te sɛ kɔla a ɛsakra, ɛyɛ mmerɛw, ɛyɛ mmerɛw, anaasɛ ɛpaapae. Ne saa nti, use value no yera.
Wɔ radical chain oxidation a ɛwɔ polymers mu no, phenolic antioxidants a esiw kwan no de proton ahorow ma ma ɛyɛ phenolic oxygen radicals. Esiane sɛ free radical ne benzene ring no yɛ conjugated nhyehyɛe nti, ɛwɔ ahoɔden pa ne dwumadi a ɛba fam, a ebetumi ama oxidation-a ɛde ba no ayɛ brɛoo. Bere koro no ara mu no, phenolic oxygen radicals nso wɔ tumi a ɛma free radicals no kɔ, a ebetumi agyae oxidation chain reaction no.
Nneɛma atitiriw ne nea wɔde di dwuma wɔ phenolic antioxidants a wɔasiw ano mu .
Monophenolic antioxidants wɔ phenolic unit biako pɛ a esiw ano. Titiriw anti-staining, efĩ biara nni hɔ. Nanso, molecule mu duru no sua na ɛyɛ hyew, na ɛma tumi a ɛko tia ɔyare mmoawa no so tew. Wobetumi de adi dwuma wɔ nhyehyɛe ahorow a enhia sɛ wim tebea no gyina ano kɛse nkutoo mu. Sɛ nhwɛso no, omnistab nneɛma bi a ɛwɔ saa ɔfa yi mu ne:
Omnistab an 1076; Nhyiam a ɛkyɛn so ne polymer nneɛma dodow no ara, low volatility, precipitation resistance pa. te sɛ PP, PE, PVC, PA, ABS, PS, PVC, SBS, PU, PET, PMMA.
Omnistab an 1135; Nsu a ɛyɛ adwuma yiye no siw phenolic antioxidant a ɛyɛ adwuma yiye no kwan. Sɛ nhwɛso no, PUR, PMMA, PVB, nneɛma a wɔde kata so ne nneɛma a wɔde nkata so.
Omnistab an 565; Ɛfata sɛ wɔde yɛ rɔba a ɛnyɛ den. Ebetumi ama thermo-oxidative aging ne degradation a ɛwɔ elastomers mu no agyina yiye, na ebetumi asiw adeyɛ a ɛne gelation no ano. Ɛfata ma SBS, SIS, TPE, BR, SBR ne rɔba afoforo.
Bisphenol a ɛko tia ɔyare mmoawa .
Bisphenol antioxidants kyerɛ phenolic antioxidants a phenol units abien a esiw kwan no nam alkyl bond anaa sulphur bond so na ɛka bom tẽẽ. Sɛ wode toto monophenolic type no ho a, bisphenolic type no wɔ molecule mu duru a ɛkorɔn na ɛma ɔhyew no gyina yiye, enti ɛwɔ anti-anyin nkɛntɛnso pa. Omnistab bisphenol antioxidants abien no ne:
Omnistab an 1035; yɛ sulfur a esiw phenolic antioxidant a ɛma ɛyɛ adwuma yiye ma polymers. Wɔde di dwuma kɛse wɔ PE waya ne cable, anaa pp, HDPE, PUR mu.
Omnistab an 1024; Metal passivator a ɛwɔ anti-oxidation ne dadeɛ passivation dwumadie mmienu .
Polyphenol a ɛko tia ɔyare mmoawa .
Polyphenol antioxidants no wɔ phenol units bɛboro abien a esiw kwan wɔ wɔn molecule nhyehyɛe mu. Omnistab nneɛma abiɛsa, a ɛyɛ polyphenol a ɛko tia ɔyare mmoawa:
Omnistab an 1010; Nsakrae a ɛba fam, hua a enni hɔ, tumi kɛse a esiw phenolic antioxidant ano. Ɛyɛ papa wɔ PP, PE, PVC, PA, PBT, PET ne nneɛma a wɔde nkata so mu.
Omnistab an 1330; Nea ɛfata titiriw ma polyolefin nneɛma a ɛhwehwɛ sɛ wɔko tia nsu a woyi fi mu ne kɔla a ɛsakra kɛse. Nneɛma a wɔde di dwuma wɔ PP, HDPE, TPE, ABS, PVC.
Omnistab an 3114; Ɛyɛ adwuma yiye koraa wɔ polyolefins mu. Omnistab an 3114 ne UV absorbers anaa phosphites yɛ adwuma bom.
Akwankyerɛ a ɛfa phenolic antioxidants a wɔasiw ano a wɔde bedi dwuma ho .
Sɛ wɔka phenolic antioxidants a esiw kwan ne phosphite anaa thioester antioxidants bom di dwuma a, ebetumi ama wɔanya nkɛntɛnso ahorow a ɛyɛ adwuma abom! phenolic antioxidants a esiw kwan no yɛ adwuma sɛ nkɔnsɔnkɔnsɔn terminators denam free radicals a ɛtwetwe no so. Nanso, phenols a esiw kwan no ntumi nsɛe hydroperoxides, enti ɛsɛ sɛ wɔtaa de di dwuma wɔ nnuru a ɛto so abien a ɛko tia ɔyare mmoawa (te sɛ phosphites anaa thioesters) ne HALS ho.
Wobɛpɛ sɛ wosua pii fa ɔkwan a wɔfa so yɛ adwuma no ho anaasɛ wo nsa ka application-afotu pɔtee? Di yɛn ho nkɔmmɔ na yɛn ani begye sɛ yɛbɛboa wo. Sɔ yɛn hwɛ!
