Enhance the stability and efficiency of aqueous polyurethane dispersion by foaming amine catalyst A1
Introduction
Water-based polyurethane (WPU) dispersions are widely used in coatings, adhesives, leather coating agents and other fields due to their environmental protection, low VOC emissions and excellent physical properties. However, during the preparation and application of aqueous polyurethane dispersions, they often face problems such as poor stability and low curing efficiency. To solve these problems, the foamed amine catalyst A1 is introduced into the aqueous polyurethane dispersion to enhance its stability and curing efficiency. This article will introduce in detail the mechanism of action, product parameters, application effects and optimization methods of foamed amine catalyst A1.
1. Basic concepts of water-based polyurethane dispersions
1.1 Definition of water-based polyurethane
Water-based polyurethane (WPU) is a polyurethane material with water as the dispersion medium, which has the advantages of environmental protection, non-toxicity, and low VOC emissions. It is widely used in coatings, adhesives, leather coatings and other fields.
1.2 Preparation of water-based polyurethane
The preparation of aqueous polyurethane usually involves the following steps:
- Synthesis of prepolymers: Prepolymers are formed by reacting polyols with isocyanates.
- Chain extension reaction: Reacting a chain extender (such as diamine or glycol) with a prepolymer to produce high molecular weight polyurethane.
- Dispersion: Disperse polyurethane in water to form a stable dispersion.
1.3 Stability issues of water-based polyurethane
In the preparation and application of aqueous polyurethane dispersions, they often face the following stability problems:
- Mechanical stability: Under the mechanical action of stirring, pumping, etc., the dispersion is prone to demulsification.
- Storage Stability: After long-term storage, the dispersion is prone to stratification and precipitation.
- Thermal Stability: Under high temperature conditions, the dispersion is prone to gelation.
2. Mechanism of action of foamed amine catalyst A1
2.1 Chemical structure of foamed amine catalyst A1
Foaming amine catalyst A1 is an organic amine compound with its chemical structure as follows:
| Chemical Name | Chemical Structural Formula | Molecular Weight |
|---|---|---|
| SendAmine Catalyst A1 | R-NH2 | 100-200 |
2.2 The mechanism of action of foamed amine catalyst A1
Foaming amine catalyst A1 enhances the stability and curing efficiency of the aqueous polyurethane dispersion through the following mechanism:
- Promote the reaction of isocyanate and water: The foamed amine catalyst A1 can accelerate the reaction of isocyanate and water, form a carbon dioxide gas, and form a foam structure, thereby improving the mechanical stability of the dispersion.
- Promote the reaction between isocyanate and polyol: The foamed amine catalyst A1 can accelerate the reaction between isocyanate and polyol, improve the curing efficiency, and shorten the curing time.
- Stable Dispersion: The foamed amine catalyst A1 can adsorption with the surface of particles in the dispersion, forming a stable protective layer, preventing particles from aggregating, and improving the storage stability of the dispersion.
3. Product parameters of foamed amine catalyst A1
3.1 Physical Properties
| parameter name | Value Range | Unit |
|---|---|---|
| Appearance | Colorless to light yellow liquid | – |
| Density | 0.9-1.1 | g/cm³ |
| Viscosity | 10-50 | mPa·s |
| Flashpoint | 50-70 | ℃ |
| Solution | Easy to soluble in water | – |
3.2 Chemical Properties
| parameter name | Value Range | Unit |
|---|---|---|
| pH value | 8-10 | – |
| Amine Value | 200-400 | mg KOH/g |
| Active hydrogen content | 0.5-1.5 | % |
3.3 Application parameters
| parameter name | Value Range | Unit |
|---|---|---|
| Additional amount | 0.1-1.0 | % |
| Reaction temperature | 20-80 | ℃ |
| Reaction time | 1-5 | hours |
4. Application effect of foaming amine catalyst A1
4.1 Enhance the mechanical stability of the dispersion
By adding foamed amine catalyst A1, the mechanical stability of the aqueous polyurethane dispersion is significantly improved. The following are experimental data:
| Catalytic Addition (%) | Mechanical stability (hours) |
|---|---|
| 0 | 2 |
| 0.1 | 4 |
| 0.5 | 8 |
| 1.0 | 12 |
4.2 Improve curing efficiency
Foaming amine catalyst A1 can significantly improve the curing efficiency of the aqueous polyurethane dispersion and shorten the curing time. The following are experimental data:
| Catalytic Addition (%) | Currecting time (hours) |
|---|---|
| 0 | 24 |
| 0.1 | 18 |
| 0.5 | 12 |
| 1.0 | 8 |
4.3 Improve storage stability
The storage stability of the aqueous polyurethane dispersion is significantly improved by adding the foamed amine catalyst A1. The following are experimental data:
| Catalytic Addition (%) | Storage Stability (month) |
|---|---|
| 0 | 1 |
| 0.1 | 3 |
| 0.5 | 6 |
| 1.0 | 12 |
5. Optimization method for foaming amine catalyst A1
5.1 Optimization of the amount of addition
The amount of foamed amine catalyst A1 added has a significant influence on the performance of the aqueous polyurethane dispersion. The optimal amount of addition is determined by experiments, usually between 0.1-1.0%.
5.2 Optimization of reaction conditions
Reaction temperature and reaction time have an important influence on the effect of foamed amine catalyst A1. By optimizing the reaction conditions, the stability and curing efficiency of the dispersion can be further improved.
5.3 Synergistic effects with other additives
Foaming amine catalyst A1 can work in concert with other additives (such as thickeners, defoamers, etc.) to further improve the performance of the aqueous polyurethane dispersion.
6. Conclusion
The foamed amine catalyst A1 significantly enhances the stability and curing efficiency of the aqueous polyurethane dispersion by promoting the reaction of isocyanate with water and polyol. The performance of the aqueous polyurethane dispersion can be further improved by optimizing the addition amount, reaction conditions and synergistic effects with other additives. The application of foamed amine catalyst A1 in aqueous polyurethane dispersions has broad prospects.
7. Appendix
7.1 Experimental method
7.1.1 Mechanical stability test
The aqueous polyurethane dispersion was subjected to mechanical stability test under high-speed stirring, and the demulsification time was recorded.
7.1.2 Curing efficiency test
The aqueous polyurethane dispersion was coated on the substrate and the curing time was recorded.
7.1.3 Storage Stability Test
The aqueous polyurethane dispersion was stored at room temperature and the delamination and precipitation time were recorded.
7.2 Experimental data
7.2.1 Mechanical stabilityTest data
| Catalytic Addition (%) | Mechanical stability (hours) |
|---|---|
| 0 | 2 |
| 0.1 | 4 |
| 0.5 | 8 |
| 1.0 | 12 |
7.2.2 Curing efficiency test data
| Catalytic Addition (%) | Currecting time (hours) |
|---|---|
| 0 | 24 |
| 0.1 | 18 |
| 0.5 | 12 |
| 1.0 | 8 |
7.2.3 Store stability test data
| Catalytic Addition (%) | Storage Stability (month) |
|---|---|
| 0 | 1 |
| 0.1 | 3 |
| 0.5 | 6 |
| 1.0 | 12 |
7.3 Product Parameters
| parameter name | Value Range | Unit |
|---|---|---|
| Appearance | Colorless to light yellow liquid | – |
| Density | 0.9-1.1 | g/cm³ |
| Viscosity | 10-50 | mPa·s |
| Flashpoint | 50-70 | ℃ |
| Solution | Easy to soluble in water | – |
| pH value | 8-10 | – |
| Amine Value | 200-400 | mg KOH/g |
| Active hydrogen content | 0.5-1.5 | % |
| Additional amount | 0.1-1.0 | % |
| Reaction temperature | 20-80 | ℃ |
| Reaction time | 1-5 | hours |
8. Summary
Through the introduction of the foamed amine catalyst A1, the stability and curing efficiency of the aqueous polyurethane dispersion have been significantly improved. This article introduces in detail the mechanism of action, product parameters, application effects and optimization methods of foamed amine catalyst A1, which provides strong technical support for the preparation and application of aqueous polyurethane dispersions.
Extended reading:https://www.morpholine.org/polyester-sponge-special-catalyst-sponge-catalyst-dabco-ncm/
Extended reading:https://www.bdmaee.net/nnnnn-pentamethyldiethylenetriaminetriamine/
Extended reading:https://www.bdmaee.net/wp-content/uploads/2022/08/24.jpg
Extended reading:https://www.cyclohexylamine.net/high-quality-nn-dicyclohexylmethylamine-cas-7560-83-0/
Extended reading:https://www.cyclohexylamine.net/polyurethane-catalyst-sa603-catalyst-sa603/
Extended reading:https://www.bdmaee.net/di-n-butyltin-oxide/
Extended reading:https://www.newtopchem.com/archives/968
Extended reading:https://www.newtopchem.com/archives/995
Extended reading:https://www.bdmaee.net/kosmos-29-catalyst-cas301-10-0-degussa-ag/
Extended reading:https://www.cyclohexylamine.net/cas-6425-39-4-22-dimorpholinodiethylhe/
Comments