Azobisisobutyronitrile CAS 78-67-1

Polyurethane
Polyurethane modification: waterborne polyurethane modification is modified by the reaction of polyurethane (PU) prepolymerized monomer, other products (modified silicone, acrylic emulsion, etc.) and AIBN initiator.

1. The polyurethane prepolymer containing NCO group is reacted with hydroxyacrylic acid, and then acrylic monomer is added for free radical polymerization to obtain polyurethane acrylate (PUA). (single component).
2. The OH-containing acrylic prepolymer is reacted with the NCO group-containing polyurethane prepolymer or polyisocyanate to obtain polyurethane acrylate (PUA). (two-component).
3. Add blocked polyisocyanate to OH-containing acrylate polymer. (single component).

Plexiglass/PMMA
The use of AIBN initiators will improve product clarity and improve impact and tensile properties.

Plexiglass production: use AIBN as an initiator. The first stage is pre-polymerized at 90-95 ℃ to a conversion rate of about 10% to obtain a viscous slurry, and then the mold is heated and polymerized in stages, generally starting from 40-45 ℃, and slowly heating up, and the later temperature reaches about 90 ℃ (needs It lasted several days), and finally demolded into a plexiglass sheet.

PMMA acrylic resin
The synthesis reaction of acrylic resin is a free radical reaction, which is divided into three basic processes of chain initiation, chain growth and chain termination, and is accompanied by a chain transfer process.

Note: Most of the initiators of acrylic emulsions are peroxides, such as; BPO (dibenzoyl peroxide) or APS (ammonium persulfate) /SPS (sodium persulfate), etc.

AIBN is still mainly in acrylic resins, such as PMMA.

Plexiglass/PMMA modification
Modified plexiglass, AIBN initiator will be used when modifying plexiglass

Example: Production process of heat-resistant plexiglass: First, using azobisisobutyronitrile (AIBN) as an initiator, isobornyl methacrylate (IBMA), tricyclo[5.2.1.02,6]decyl methacrylate -8-yl ester or perfluorophenyl methacrylate (PFPMA) was used as the second monomer to prepare cyclic rigid monocopolymer modified plexiglass by bulk polymerization.

Polyether polyol/POP/white oil
Commonly used initiators in industry are azobisisobutyronitrile (AIBN) and benzoyl peroxide (BPO).

The continuous process is to continuously add all the raw materials into the reactor after mixing. Due to the increase of particles and the formation of new particles in the continuous process and the continuous discharge and back-mixing of particles in the reactor, a stable dispersion system with a wide particle size distribution is generally produced. The continuous method generally adopts a double-kettle process, which means that two reactors connected in series are installed in the POP manufacturing process. The process flow is: (basic polyether, macromolecular dispersant, chain transfer agent, AN, SM, AIBN) → batching Kettle → Feeding Kettle → First Reactor → Second Reactor → Flash Evaporator → Thin Film Evaporator → Finished Product Receiving Tank → Packaging, Storage and Transportation.

Synthetic Plastic – Vinyl / VER
Vinyl resin ester (VER)

A part of the synthetic resin (plastic) formed by the polymerization of a vinyl monomer (CH2=CH). Including polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate and its derivatives (polyvinyl alcohol, polyvinyl acetal), polyvinyl ether, polyvinyl carboxy}`, poly (N-vinyl pyrrolidone) )Wait.

Synthetic Plastic – ABS
ABS production mainly includes emulsion grafting, emulsion grafting blending method and continuous bulk method;

The emulsion grafting method has now been replaced by the emulsion grafting blending method;

The emulsion graft blending method is to carry out emulsion graft copolymerization of part of styrene (PS) monomer and acrylonitrile with polybutadiene latex, and another part of styrene monomer and acrylonitrile monomer to copolymerize to form SAN, By blending the two in different proportions, various grades of ABS resin can be obtained. The continuous bulk method refers to the use of 3-5 continuous reactors in series.

ABS modified
Study on the grafting of maleic anhydride (MAH) on ABS by solution grafting method, such as using dicumyl peroxide (DCP) and azobisisobutyronitrile (AIBN) as initiators in suitable acetone or tetrahydrofuran. -Methacrylic acid graft copolymerization to ABS

ABS modification direction
One is to overcome the main shortcomings of ABS resin, such as poor weather resistance and poor transparency;

The second is to improve other properties of ABS, such as mechanical properties and flame retardancy.

Among them, transparent modification and flame retardant modification will use AIBN.

Transparency: ABS is modified with polystyrene, PMMA and polycarbonate, etc.

Weather resistance: adding other elastomers without double bonds in ABS, adding anti-aging and anti-oxidative light stabilizers

Flame retardancy: change the components of ABS copolymer, such as adding fumarate or tribromostyrene as the fourth monomer to copolymerize with styrene, butadiene, acrylonitrile, and mix high flame retardant resin (such as PVC, CPE, etc.), adding flame retardants.

ABS blend, PVC, PC, PMMA, PVDF (polyvinylidene fluoride), AIBN will be used.

ABS/PVC blends not only have excellent flame retardant properties and impact resistance, but also have improved tensile properties, bending properties and hinge properties, chemical resistance and tear resistance compared to ABS. ABS and polycarbonate (PC) For blending, AIBN will be used;

ABS and PC show good impact strength, flexibility, rigidity, heat resistance and a wide processing temperature range, especially can significantly improve the chemical resistance and low temperature toughness of ABS and the compatibility of ABS and PMMA. use AIBN;

The blend has high surface hardness (up to 2 times that of ABS), high rigidity, good appearance, excellent processability, and ideal scratch resistance and impact resistance. By properly adjusting the rubber particle size of ABS, transparent materials can also be obtained.

Blends of ABS and PA are among the materials with the highest impact strength. The chemical stability of ABS at high temperature is improved, and it has warpage resistance, good fluidity and beautiful appearance, but the water absorption is large and the elastic modulus is decreased.

The blending of ABS resin and polybutylene terephthalate (PBT) is a part of the high performance of ABS resin. The amorphous nature of ABS resin and the crystallinity of PBT in this blend make it excellent in moldability, dimensional stability, chemical resistance, oil resistance, and heat resistance.

ABS is blended with polyvinylidene fluoride (PVDF), and AIBN will be used to improve the chemical resistance, abrasion resistance, pollution resistance and ultra-weather resistance of ABS.

Blending with styrene/butadiene/styrene (SBS) copolymer can improve the fluidity and low temperature resistance of ABS, blending ABS with polyphenylene sulfide (PSO) or CPE, heat resistance and flame retardancy of ABS Sex can be improved.

ABS polysulfone (PSF) or tert-butylstyrene-maleic anhydride copolymer blends can increase the heat distortion temperature.

Ternary blend of PSF/ABS/Alkylbenzenediphenylphosphate to improve impact resistance and heat resistance.