The distinctive feature of cationic waterborne polyurethane comes from its cationic properties, and its applications are mostly based on these ionic characteristics. Due to its positive charge, it exhibits excellent adsorption and adhesion properties, and is widely used in leather base coat coatings, wood paint sealing coatings, metal coatings, adhesives, digital printing ink-receiving layers, personal care products, fabric finishing agents, and more.

About Cationic Waterborne Polyurethane

 

Cationic waterborne polyurethanes refer to a class of polyurethanes that incorporate nitrogen-containing cationic groups in the main chain or side chain of the polyurethane molecule. Hydrophilic cationic groups can be ammonium ions, thiol ions, and phosphonium ions.

Common cationic groups include tertiary amine ions and quaternary ammonium ions. These cationic groups allow the polyurethane molecules to form stable colloidal dispersions in water.

2、Cationic Waterborne Polyurethane Synthesis

Synthesis Method

In order to obtain cationic polyurethanes with excellent performance, researchers have been continuously exploring synthesis methods. Currently, there are mainly two approaches to introduce nitrogen-containing cationic groups through polymerization:

01、Using amine-based chain extenders:

After introducing these groups, hydrophilic ions are formed through acid neutralization.

Using the Menschutkin reaction to introduce quaternary ammonium ions on the side chains of polyurethanes, quaternization forms hydrophilic groups.

Tips：

The formation of salts through acid neutralization is reversible, especially when using volatile acids such as acetic acid or hydrochloric acid. On the other hand, quaternization is permanent.

Synthesis Case

Formula

Synthesis Process

1. PTMG and IPDI are reacted at 102-107°C for about 1 hour under dry nitrogen protection.

2. The reaction temperature is cooled to 77°C, and MDEA is added. The reaction mixture is stirred at 79-85°C for 40 minutes to prepare a prepolymer with NCO end-capping.

3. The mixture is cooled to 51°C, and HAc is added with stirring.

4. The neutralized prepolymer is added to water containing EDA to form a water dispersion of cationic NCO end-capped polyurethane prepolymer.

5. The remaining NCO reacts with water overnight to prepare a stable water dispersion of cationic polyurethane that is clear (without condensation and flocculation).

3、Findunm Cationic Waterborne Products

With a wealth of synthetic experience, the Findunm team continuously innovates and explores based on known synthetic methods, developing a series of high-performance cationic waterborne polyurethane products known for their strong antibacterial properties, high adhesion, and environmentally friendly low VOC characteristics. In addition to cationic waterborne polyurethanes, the Findunm team has also developed cationic waterborne acrylic products for various applications.

Findunm Cationic Resin Testing and Evaluation Report

Basic parameters of resin

Findunm Cationic Waterborne Product TDS

Carboshi®2608 Acrylic Emulsion

Carboshi® 2608 is a cationic acrylic emulsion developed based on proprietary technology. It contains highly permeable components, which have excellent permeability to various substrates. It is applied with cross-linking technology, thus it has excellent adhesion, water resistance, and temperature resistance. It also has excellent adhesion to various underlying old coatings and topcoat coatings, thus it has excellent repair adaptability.

Performance Characteristics

●Excellent permeability

●Excellent adhesion

●Excellent resistance to yellowing

●Excellent repair adaptability

●Water resistance, temperature resistance

Recommended Applications

Leather coatings, plastic coatings, metal anticorrosive coatings, wood sealer primers

 

Physical and Chemical Properties

 

Features	Indicators
Appearance	Milky white liquid
Solid Content, %	25±1
PH	5±1
Viscosity,cps	9
*The above data is for general use only and is not intended as a product specification.

 

Storage Conditions

Recommended storage temperature: 5-35°C

Stir before use, and please clean empty containers promptly

Store in a sealed container for no more than 10 months

Do not use the product if it has been frozen

 

Findunm®2089 Waterborne Resin

 

Findunm®2089 is a waterborne resin product developed and produced using proprietary technology. It is solvent-free and exhibits excellent wetting penetration and sealing properties. It is suitable for base coating and decoration of various white and light-colored leather.

 

Performance Characteristics:

Solvent-free, low VOC

Good film-forming properties

Excellent abrasion resistance and moisture resistance

Chemical resistance

Cationic charge

Excellent wetting penetration and sealing properties

 

Recommended Applications:

Leather coatings

Wood coatings

Plastic coatings

Textile coatings

 

Physical and Chemical Properties

 

Features	Indicators
Appearance	Transparent liquid
Solid Content, %	25±1
PH	5.0±1
Viscosity, mPa·s	38
The above data is for general use only and is not intended as a product specification.

 

Storage Conditions

Recommended storage temperature: 5-35°C

Stir before use, and please clean empty containers promptly

Store in a sealed container for no more than 10 months

Do not use the product if it has been frozen

 

Findunm® 2051 Polyurethane Dispersion

Findunm® 2051 is a tough yet flexible aliphatic cationic polyurethane dispersion that does not contain solvents such as alkylphenol ethoxylates. It is suitable for various applications including digital printing, printing coatings, paper and fiberglass coatings, medical products, personal care products, and more.

Findunm® 2051 can be crosslinked using melamine, isocyanate crosslinkers, or nitrogen-containing compounds. This product is stable with cationic additives and weak acid additives.

 

Performance Characteristics:

●Solvent-free, low VOC

●Excellent film-forming properties

●Outstanding abrasion and moisture resistance

●Chemical resistance

●Cationic charge

●Compliant with TSCA standards

 

Recommended Applications:

Digital printing ink layers, metal coatings, personal care products, textile coatings

 

Physical and Chemical Properties

 

Features	Indicators
Appearance	Semi-transparent blue
Solid Content, %	35±1
pH	6.0±1
Viscosity, mPa·s	23
The above data is for general use only and is not intended as a product specification.

 

Storage Conditions

Recommended storage temperature: 5-35°C

Stir before use, and please clean empty containers promptly

Store in a sealed container for no more than 10 months

Do not use the product if it has been frozen

 

Findunm® 2058 Water-based Resin

 

Findunm® 2058 is a water-based resin product developed and produced based on proprietary technology. It is suitable for fiber impregnation, fabric functional finishing, and is used in ink absorption coatings with good ink fixing effects. It not only has excellent stability and water resistance, but also exhibits good adhesion to metals, especially galvanized steel sheets, with a certain light anti-corrosion effect.

Adding 3-5% curing agent to Findunm® 2058 can enhance water resistance.

 

Performance Characteristics

●Solvent-free, low VOC

●Good adhesion

●Excellent stability and water resistance

●Anti-corrosive properties

 

Recommended Applications

Digital printing ink layers, metal coatings, textile coatings

 

Physical and Chemical Properties

 

Features	Indicators
Appearance	Semi-transparent to milky white liquid.
Solid Content, %	30±1
pH	5±1
The above data is for general use only and is not intended as a product specification.

 

Recommended storage temperature: 5-35°C

Stir before use, and please clean empty containers promptly

Store in a sealed container for no more than 10 months

Do not use the product if it has been frozen