Table Of Content
1 What is Antioxidant ?2 Antioxidant types / classification
What is Antioxidant ?
Definition Of Antioxidant
Antioxidant is a chemical compound that prevents oxygen from reacting with other compounds that are susceptible to oxidation.Polymer / plastic antioxidant, is a class of heat stabilizers,can be added to improve shelf life of the product or to improve its high temperature stability. while adding a stability margin during thermal processing
Antioxidant Classification
Classified by mechanism
Antioxidants can be divided into two classes, according to their mechanism in interrupting the degradation process: (a) chain-terminating primary anti-oxidants; and (b) hydroperoxide-decomposing secondary antioxidants
Primary Antioxidant react rapidly and are termed "radical scavengers'".The most important are sterically hindered phenolics and secondary aromatic amines.Hindered phenolics are high molecular weight anti-oxidants for polymer systems that are sensitive to thermal and oxidative degradation, due to formation of free radicals and peroxides. They protects against degradation at high processing temperatures and are highly efficient, low in volatility, and non-staining, with wide toxicological clearance and are effective at very low dosages (0.01-0.1%)
Secondary Antioxidant react with hydroperoxides to produce non-radical products and are therefore often termed 'hydroperoxide decomposers'. They differ from primary phenols and amines in that they are decomposed by reaction with hydroperoxide, rather than containing it. They are particularly useful in synergistic combinations with primary anti-oxidants. Phosphite / phosphonites are generally regarded as secondary antioxidant.
Antioxidant Binary Blends, primary antioxidants plus a high-temperature hydrolytically stable organo-phosphite secondary antioxidant Or thioesters plus phenolic antioxidant, Their use is limited to applications where possible effects on odour or taste and negative interaction with HALS (hindered amine light stabilizers) are not important.
Classification by chemistry
Industrial Antioxidant additives also classified into phenolics,metal deactivates,amines,phosphites,thioesters and binary blends among the industry.classification by application
Industrial Antioxidant can also classified into categories as below
categories
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Material
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Polyolefin
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PP thick section
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PP thin section
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Fiber & strip
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HDPE
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LDPE
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LLDPE
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PEX
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PB
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Styrenics
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PS
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SAN
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IPS
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HIPS
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MBS
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ABS
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SIS
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SBS
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PUR
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PUR
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Engineering plastic
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PC
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POM
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PET
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PBT
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UPR
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Aliphatic PA
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TPEE
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TPU
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PMMA
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PPE
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PSU
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PVC
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RPVC
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PPVC
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Elastomer
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BR
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IR
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SBR
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NBR
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EPR,EPDM
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Thermoplastic rubber
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TPO
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X-SBR
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classification by end use
there are six main end use sector in antioxidant end use- Building and construction
- Electrical and electronic ( E&E industry)
- Packing
- Automotive Industry
- Agriculture
- Fiber/Fibre
About us
Established in 2008 and with nearly a decade of experiences in additives for polymer in China.
Our product range are organic pigments,antioxidants,uv absorber,light stabilizers,optical brighteners.
Committed to provide customers with satisfied goods and services on time.Our goal is to be a comprehensive supplier and our customers' advisor in our section with consistent quality and sustainable oriented.
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