POLYAZIRIDINE

Polyaziridine is a highly reactive, aziridine-functional polymer commonly used as a crosslinker for waterborne coatings, inks, adhesives, and polymer dispersions.
Polyaziridine reacts readily with carboxyl, hydroxyl, and other nucleophilic groups, and Polyaziridine improves chemical resistance, water resistance, abrasion resistance, and wet rub durability in cured films.
Polyaziridine must be handled with strict safety precautions because Polyaziridine can be a strong skin sensitizer and irritant, and Polyaziridine exposure control, PPE, and regulatory compliance are essential in industrial use.

CAS Number: Mixture (supplier-specific; many commercial polyaziridines are proprietary)
EC Number: Mixture (supplier-specific)
Molecular Formula: Variable (aziridine-functional polymer)
Molecular Weight: Variable (polymer; grade dependent)

Synonyms: Polyaziridine, Polyfunctional Aziridine Crosslinker, Aziridine Crosslinker, Polyaziridine Resin, Polyaziridine Curing Agent, Multifunctional Aziridine, Waterborne Crosslinker Aziridine, Aziridine-Functional Polymer, Polyaziridine Additive, Polyaziridine Hardener, Polyaziridine Fixative (coatings), Aziridine Crosslinking Agent, Polyaziridine, Poly(aziridine), POLYAZIRIDINE, Polyaziridine polymer, Aziridine polymer, Aziridine homopolymer, Poly(ethylene imine), Polyethyleneimine, Poly(ethyleneimine), Polyethylenimine, Polyethylenimine (PEI), PEI, Polyethylene imine, Polyethyleneimine resin, Polyaziridine resin, Polyaziridine crosslinker, Polyaziridine cross-linker, Aziridine-based crosslinker, Polyfunctional aziridine, Polyfunctional aziridine crosslinker, Multifunctional aziridine, Multifunctional aziridine crosslinker, Polyaziridine curing agent, Polyaziridine hardener, Polyaziridine additive, Polyaziridine binder additive, Polyaziridine adhesion promoter (use context), Polyaziridine for coatings (use context), Polyaziridine for inks (use context), Polyaziridine for adhesives (use context), Polyaziridine for waterborne systems (use context), Polyaziridine for dispersions (use context), Polyaziridine for latex (use context), Polyaziridine for pigment pastes (use context), Polyaziridine for printing inks (use context), Polyaziridine for textile coatings (use context), Polyaziridine for paper coatings (use context), Polyaziridine for leather finishes (use context), Polyaziridine for wood coatings (use context), Polyaziridine for metal coatings (use context), Polyaziridine (waterborne crosslinker) (use context), Polyaziridine (carboxyl-reactive crosslinker) (use context), Polyaziridine (self-crosslinking additive) (use context), Polyaziridine dispersion crosslinker (use context), Polyaziridine solution, Polyaziridine in solvent (formulation), Polyaziridine in water (formulation), Polyaziridine concentrate (common wording), Polyaziridine liquid, Polyaziridine low viscosity (grade context), Polyaziridine medium viscosity (grade context)

APPLICATIONS

Polyaziridine is used in waterborne polyurethane dispersions to increase chemical resistance and improve durability.
Polyaziridine is incorporated into waterborne PU topcoats to improve solvent resistance and wet rub performance.
Polyaziridine is used in 2K waterborne clearcoats where pot life and crosslink density are optimized.

Polyaziridine is used in waterborne acrylic coatings to crosslink carboxyl-functional binders and improve water resistance.
Polyaziridine is incorporated into industrial maintenance coatings to improve abrasion resistance and stain resistance.
Polyaziridine is used in floor coatings to improve scuff resistance and cleaning chemical resistance.

Polyaziridine is used in water-based inks to improve rub resistance and reduce blocking in stacked prints.
Polyaziridine is incorporated into packaging inks to improve resistance to oils, greases, and water in compatible systems.
Polyaziridine is used in label inks to improve adhesion and durability on difficult substrates.

Polyaziridine is used in waterborne overprint varnishes to improve mar resistance and increase wet rub durability.
Polyaziridine is incorporated into clear varnishes to reduce tackiness and improve block resistance.
Polyaziridine is used in protective coatings for printed films to improve handling and transport durability.

Polyaziridine is used in waterborne adhesives to improve heat resistance and water resistance in bonded assemblies.
Polyaziridine is incorporated into pressure-sensitive adhesives to improve cohesion and reduce edge ooze in compatible systems.
Polyaziridine is used in laminating adhesives to improve bond durability under humidity exposure.

Polyaziridine is used in textile printing binders to improve wash fastness and wet rub performance.
Polyaziridine is incorporated into pigment printing systems to improve binder crosslinking and reduce crocking.
Polyaziridine is used in textile coatings to improve water resistance and abrasion durability.

Polyaziridine is used in leather finishing coatings to improve resistance to perspiration, water spotting, and abrasion.
Polyaziridine is incorporated into leather topcoats to improve wet rub and chemical resistance.
Polyaziridine is used in synthetic leather coatings to improve durability and surface toughness.

Polyaziridine is used in nonwoven binders to improve wet strength and durability in water exposure.
Polyaziridine is incorporated into paper and packaging coatings to improve water resistance and print durability.
Polyaziridine is used in specialty paper coatings to improve resistance to oils and staining.

Polyaziridine is used in automotive interior coatings to improve stain resistance and wear durability in compatible waterborne systems.
Polyaziridine is incorporated into plastic coatings to improve adhesion and scratch resistance.
Polyaziridine is used in appliance coatings to improve chemical resistance to cleaners and household chemicals.

Polyaziridine is used in corrosion-protective waterborne primers where improved film integrity reduces water uptake.
Polyaziridine is incorporated into metal coatings to improve resistance to saltwater and humidity exposure in compatible designs.
Polyaziridine is valued because Polyaziridine provides efficient crosslinking at low addition levels, improving durability and resistance properties across many waterborne coating, ink, and adhesive systems.

Polyaziridine is used as a crosslinker in waterborne coatings to improve chemical resistance.
Polyaziridine reacts with carboxyl-functional binders to build a tighter polymer network.
Polyaziridine helps increase durability of films exposed to water, solvents, and detergents.

Polyaziridine is used in waterborne polyurethane dispersions to improve wet and solvent resistance.
Polyaziridine supports stronger crosslink density for better abrasion performance.
Polyaziridine helps reduce tack and blocking in cured coating films.

Polyaziridine is used in acrylic emulsion coatings to improve scrub resistance.
Polyaziridine helps coatings withstand repeated cleaning in architectural and industrial applications.
Polyaziridine supports better stain resistance on painted surfaces.

Polyaziridine is used in wood coatings to improve resistance to household chemicals and alcohol.
Polyaziridine supports tougher films that resist marring and wear.
Polyaziridine helps maintain gloss and appearance under service conditions.

Polyaziridine is used in protective coatings for metal to improve corrosion-related durability in some systems.
Polyaziridine supports tighter films that reduce water permeability.
Polyaziridine helps improve adhesion retention after humidity exposure.

Polyaziridine is used in concrete and masonry coatings to improve alkali and water resistance.
Polyaziridine supports performance on mineral substrates in demanding environments.
Polyaziridine helps improve long-term adhesion under moisture cycling.

Polyaziridine is used in waterborne adhesives to improve heat resistance and cohesive strength.
Polyaziridine crosslinks carboxylated polymers to reduce creep under load.
Polyaziridine helps improve bond durability under humidity exposure.

Polyaziridine is used in lamination adhesives for flexible packaging in suitable systems.
Polyaziridine supports improved resistance to delamination after aging.
Polyaziridine helps increase solvent and oil resistance of adhesive layers.

Polyaziridine is used in pressure-sensitive adhesives to improve shear holding power.
Polyaziridine supports reduced cold flow in label and tape adhesives.
Polyaziridine helps maintain performance at elevated temperatures.

Polyaziridine is used in textile printing binders to improve wash fastness.
Polyaziridine supports stronger binder networks that hold pigments on fibers.
Polyaziridine helps reduce crocking and color transfer in printed textiles.

Polyaziridine is used in textile finishing to improve durability of functional finishes.
Polyaziridine supports better retention of water-based coatings on fabric surfaces.
Polyaziridine helps increase resistance to detergents and repeated laundering.

Polyaziridine is used in nonwoven binders to increase wet strength.
Polyaziridine helps stabilize binder films under water exposure.
Polyaziridine supports improved integrity of treated wipes and technical nonwovens.

Polyaziridine is used in paper coating formulations to improve water resistance and wet rub.
Polyaziridine supports improved holdout and surface durability on coated papers.
Polyaziridine helps reduce fiber raising and surface damage during handling.

Polyaziridine is used in primer formulations to improve adhesion of subsequent layers.
Polyaziridine supports stronger intercoat bonding in multi-layer coating stacks.
Polyaziridine helps reduce delamination risk during thermal cycling.

DESCRIPTION

Polyaziridine is a reactive crosslinker containing aziridine rings, and these rings open and react with nucleophiles such as carboxylic acids to form covalent crosslinks.
Polyaziridine is commonly supplied as a liquid crosslinker, often in solvent or as a formulated blend, and Polyaziridine is typically added shortly before application due to limited pot life after mixing.
Polyaziridine performance depends on binder functionality, pH, water content, temperature, and formulation additives, so Polyaziridine dosage and mixing protocol are optimized for each system.

Polyaziridine can significantly improve water resistance and chemical resistance, but Polyaziridine can also increase film hardness and reduce flexibility if overdosed.
Polyaziridine is sensitive to moisture and can self-react or lose activity over time, so Polyaziridine storage conditions and shelf-life control are important for consistent results.
Polyaziridine may be subject to regulatory restrictions or hazard labeling requirements in many markets, so Polyaziridine use requires careful compliance management.

Polyaziridine should be handled to avoid skin contact and inhalation of aerosols, and Polyaziridine should only be used by trained personnel with appropriate PPE.
Polyaziridine mixing equipment should be cleaned promptly after use to prevent cured residues and to reduce exposure risks.
Polyaziridine waste and contaminated materials must be disposed of according to local hazardous waste regulations and facility procedures.

PROPERTIES

Common Name: Polyaziridine
Chemical Type: Aziridine-functional polymer crosslinker (polyfunctional aziridine)
Appearance: Clear to slightly hazy liquid (grade dependent)
Odor: Mild characteristic odor (grade dependent)
Solubility: Dispersible or soluble in compatible solvents and waterborne systems (grade dependent)
Reactivity: Highly reactive toward carboxyl and other nucleophilic groups; crosslinking increases with temperature and time
Pot Life: Limited after addition to binder (system and dosage dependent)
Film Effect: Improves chemical resistance, water resistance, wet rub, abrasion resistance, and block resistance
Compatibility: Best with carboxyl-functional waterborne binders; compatibility depends on pH and formulation components
Stability: Sensitive to moisture and contamination; store tightly closed and follow supplier storage limits
Health Considerations: Strong sensitization and irritation potential; strict exposure control required
Storage Temperature: Typically 5–25°C, tightly closed, protect from moisture and heat (supplier dependent)
Shelf Life: Typically 6–12 months in original sealed packaging (supplier dependent)

FIRST AID

Inhalation:
Move to fresh air immediately if vapors, mists, or aerosols are inhaled.
Seek medical attention promptly if coughing, breathing difficulty, or irritation occurs.
If symptoms persist, obtain medical evaluation due to sensitization risk.

Skin Contact:
Remove contaminated clothing immediately and wash skin thoroughly with soap and water.
Seek medical attention if irritation, rash, or sensitization symptoms develop.
Do not reuse contaminated clothing until it has been thoroughly washed or disposed of appropriately.

Eye Contact:
Rinse cautiously with water for several minutes.
Remove contact lenses if present and easy to do, then continue rinsing.
Seek medical attention promptly if irritation persists.

Ingestion:
Rinse mouth with water and seek medical attention promptly.
Do not induce vomiting unless directed by medical personnel.
Never give anything by mouth to an unconscious person.

Note to Physicians:
Treat symptomatically.
Consider sensitization potential and monitor for delayed dermatitis or respiratory symptoms.
Provide supportive care based on exposure route and symptoms.

HANDLING AND STORAGE

Handling:
Use appropriate PPE including chemical-resistant gloves, goggles or face shield, and protective clothing.
Avoid skin contact and avoid generating aerosols, and do not spray without suitable engineering controls.
Use only in well-controlled industrial environments and follow product SDS instructions.

Ventilation:
Use local exhaust ventilation at points of mixing, dosing, and application.
Avoid confined spaces where vapors or mists can accumulate.
Use respiratory protection if required by risk assessment and product labeling.

Storage:
Store in tightly closed containers in a cool, dry, well-ventilated place.
Protect from moisture, heat, and direct sunlight, and keep away from acids and strong oxidizers.
Segregate from food and consumer areas, and keep containers clearly labeled.

Spill and Leak Procedures:
Isolate area and avoid skin contact, and prevent spill from entering drains if required by site rules.
Absorb with inert material and collect into suitable containers for disposal as hazardous waste.
Clean residues promptly using compatible cleaners and PPE because cured residues can be difficult to remove.

Handling Precautions:
Add Polyaziridine at the recommended stage and mix thoroughly to ensure uniform crosslinking and predictable pot life.
Verify pot life, film properties, and resistance performance with stability testing because over-crosslinking can reduce flexibility.
Rotate stock using FIFO practices and track opening dates to avoid using aged material with reduced reactivity or increased hazard risk.