Overall Introduction of Polymer Antioxidant

What Is Antioxidant? (Definition of Antioxidant)

An antioxidant is a chemical compound that prevents oxygen from reacting with other compounds that are susceptible to oxidation. Polymer antioxidant, is a class of heat stabilizers, can be added to improve the shelf life of the product or to improve its high-temperature stability. While adding a stability margin during thermal processing.

Polymer Antioxidant Classification

Industry Antioxidant Types

Type features Application
hindered phenolic Excellent Hydrolysis resistance

Extraction resistance

Yellowing resistance

Provide long-term stability

PE/PP pipe

High crystalline PP

Elastomer

Nylon

Phosphites/Phosphonites Excellent processing stability and color stability

Heat stability, no residual impurity

Hard precipitation, no adhere to water,

No blooming, improve transparency of article

Provide processing stability

PP/PE, elastomer, transparent article, PC, PC/ABS, nylon, POM etc.
thiosynergists Long heat resistance better than DSTDP/ DLTDP

No odor

For PP/PE need long-term stabilizing, filler modified PP/PE, wire, and cable
Metal Deactivators Low melting point, easy to use

Good stability, strong anti-aging

Extraction stability

Deactivate metal ion activity to prevent it boosting polyolefins degradation

PP/PE wire and cable

Filled modified materials

Antioxidant blends Excellent processing and color stability

Heat stability, no residual impurity

Granules form, no dust

Polyolefins, PC and PC alloy

Nylon, styrenics, elastomer, POM

 

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 the formation of free radicals and peroxides. They protect 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 reacts with hydroperoxides to produce non-radical products and is therefore often termed ‘hydroperoxide decomposers’. They differ from primary phenols and amines in that they are decomposed by reaction with a hydroperoxide, rather than containing it. They are particularly useful in synergistic combinations with primary anti-oxidants. Phosphite/phosphonites are generally regarded as the 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 odor 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 apply in plastics, synthetic fibers, elastomers, adhesives, tackifier resins, and waxes.

 

How Does Polymer Stabilizer (Antioxidant | UVA | HALS) Work?

Mechanism of polymer stabilizer as the photo below, polymer stabilizer include heat stabilizer and UV absorber / HALS (hindered amine light stabilizer). Heat stabilizer can subdivided into phenolics, amines, phosphites, thioesters, metal deactivates in this photo.

How to Choose Polymer Antioxidant?

General Rules to Follow When Choosing Antioxidant and UV Stabilizers

1. Stability & Extraction

Uv Stabilizers and antioxidant hydrolysis resistance are ok,it are the color stability needs to pay attention. Also, there two additives shall not react with other ingredients in a system, neither corrosion equipment nor extract by the substance on the article surface.

Hindered amine light stabilizer normally shows low alkalinity, no acidic additives shall be used together, and final article shall not apply in an acidic environment.

 

2. Solubility & Compatibility

Most polymers are non-polar while antioxidant, UV stabilizer are somewhat polar. Solubility is an issue need to concern. Antioxidant and UV stabilizers shall dissolve while not decompose in polymers processing temperature which most UV stabilizer could meet this requirement.

 

3. Migration

When possible, high molecule weight and relatively high melting point antioxidants and UVA shall be selected, each dosage shall determine based on most stringent processing and end-user environment.

 

4. Processing

When antioxidant and UV stabilizer melting range quite differ from resins’. Bias current or stick to screwing could occur. When this gap exceeds 100 ℃, UV stabilizer and antioxidant shall add in masterbatch form then mix with resin to process.

 

5. Handling and Safety

Antioxidant and UV stabilizer shall none or low toxic. No or low dust. Not harmful to human during plastic process and lifetime. Not harmful to animal or plates. No pollution to air,earth and water.

For agriculture file, food packing, toys, disposable infusion set or direct food, drug, medical device, medical devices, human contact plastics. Only FDA or EU approval antioxidant and UV stabilizer follow maximum concentration is allowed.

 

General Selection of Antioxidants for Use With UV Absorber

Care is needed in selecting anti-oxidants for use in combination with effective light-stabilization systems. High molecular weight stabilizers provide high levels of heat stability at normal application temperature. To avoid color shifts (especially yellow discoloration), BHT-free resins should be used with HALS formulations. Sulphur-containing organic compounds used as the-synergists are known to reduce the light stability level conferred by HALS, and high levels should be avoided.

PE food

contact

PE greenhouse film PP colored food contact (General

purpose

PP tapes, moldings PP colored food contact
Base resin PH PE PP PH PP PP
HMW-HALS Yes Yes Yes Yes Low

molecular

weight

Yes
Benzophenone Yes Yes Yes
food contact Yes Yes Yes Yes Yes
Thermal

stabilization

good good Very good Very good Good Limited
Application and let-down Heavy-duty sticks:

1.5-     2.5%:           film: 1.25-1.75%,

2.5-3.5%(24m); mouldings:

1.5-3%

Heavy-duty

sacks:

1.5-     2.5%: greenhouse film:

1.25-1.75%.

2.5- 3.5         (24m)

Tapes:

1-3%;

fibre: 1-3%: mouldings:

0.5-2.5%

Shrink wrap: 0.75-1.5%; greenhouse film:1-1.5%;

HDPE crates:

0.25-0.5%;

mouldings:

0.5-2.0%

Tapes:

0.5-2.0%; mouldings: 0.5-2.5%

Food crates: 0.5-1.5%; tapes:

1-3%; black tapes: 1-3%

 

 

Typical Use of Antioxidant, UV Absorber, Light Stabilizer For Plastics

The information below is not to be construed as a warranty or representation for which we assume legal responsibility, it would change without any statement, Users should undertake sufficient verification and testing to determine the suitability for their own particular purpose of any information or products referred to herein.if any questions when choosing these additives for your material,please contact our support team by (Click Here).

For Antioxidants (Click Here), jump to antioxidant product portfolio page.

For UV Absorber/Light Stabilizer (Click Here), jump to product portfolio page.

Material Application Antioxidants UV Absorber/HALS Remark
POLYOLEFIN

 

PP thick section 260-280℃

Outdoor table&chair

1010+DSTDP 622+326 DSTDP=3*1010
PP thin section

Fiber & strip

240-300℃ PP fiber:1425

1010+168/DSTDP

 

Fiber:

770 without heat

622with heat

Strip:791

Low volatile

Heat stability

Extraction resistance

Gas yellowing

HDPE 180-240℃ blowing, injection, extrusion 1010+168 791 ,944 Compatibility
LDPE Film, packing, cover,mulch,

greenhouse cover

1010 622+531 <0.1%
LLDPE Film, blowing, injection 1010+168 944/622+531 /
PEX Wire cable TMB 6 / /
PB Pipe 1010DLTDP Extraction resistance
STYRENICS PS Instrument&lamp shell 1076 UV P+770 /
SAN Kitchenware

Electrical

Automotive

1076+168 UV P+770 /
 IPS / 245,1076 UV P+770 0.1~0.25%
HIPS 245 / /
MBS / 1076+DLTDP / /
ABS Machinery industry / 245+DLTDP UV P+770 High dosage

Based on process technical

SIS Hotmelt adhensive

pressure sensitive adhesion

1076/1010

0.1-0.5%

UV P+770

Hotmelt adhensive 213 /770

pressure sensitive adhesion

213/770

SBS Sole,tar regulator 1076/1010

0.1-0.5%

UV P

Adhensive 1010+626+136

POLYURETHANE PUR Form,RIM,coating,

adhensive,fiber

 

1076+5057

Aromatic amines<0.05%

 

leather,elastomer,textile,

sole,adhensive,

fiber need uv absorber,

Sole:UV P+770 +1010

Film:770 +UV P

Color stain

mechanical property

gas yellowing

ENGINEERING 

PLASTICS

PC Window 1076+168 UV P,1577 Color stain issue
POM 220-230 245,1010 622+234 Carbon black
PET Film,coating,bottle,

Electricals,pipeline,

conveyance

1010 1577

PET fiber:770 +329

/
PBT 245 1577 /
UPR / / 329 user to test and decide
Aliphatic PA Engine blade

Heat sink cover etc.

245/1098+168 944,770 0.2-0.7%
TPEE / 329 /
TPU / 1010/245+

DLTDP+445

/ /
PMMA Glazing,signboard

lamps

0.05-0.2% UV P+770

Not always use together

/
PPE / / UV P or 770
PSU / / / exceed certain amount
PVC RPVC / / UV P or 320
PPVC / 531+944
ELASTOMER&

Rubber

BR 1520 320
IR 565 320
SBR Tire process, 1520+TNPP 320
NBR 1520+TNPP
EPR,EPDM Wire,roof film

Liner,automotive

1010 329+770
Thermoplastic rubber
TPO 3052+168
X-SBR Paper coating,

carpet backing

Nonwoven &textile liner

Cas 31851-03-3

Cas 26780-96-1

Market Trend of Polymer Antioxidant

In recent years, the development is mainly focused on the technical improvement of products, easier to handle and disperse.The main technical goal is a more lasting effect, at a lower dose level, to maintain good color and transparency when needed.The improved toxicological nature for food contact and medical applications is also a continuing goal for developers.In order to improve treatment, particles and liquid systems have been introduced and there is a general trend to greater use of masterbatch.

  • Easier to handle/disperse
  • Low dose level
  • Durable effect
  • Food Contact/Medical Application
  • Particle/liquid

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