The important role of low-odor catalyst DPA in environmentally friendly coating formulations: rapid drying and excellent adhesion to reduce VOC emissions
Introduction
With the increasing awareness of environmental protection and the increasingly strict environmental protection regulations, the coatings industry is facing huge challenges. Traditional coating formulations often contain a large amount of volatile organic compounds (VOCs), which not only cause pollution to the environment, but also pose a threat to human health. Therefore, the development of environmentally friendly coatings with low VOC emissions has become an important direction in the industry. As a highly efficient catalyst, DPA (Diphenylamine) plays an important role in environmentally friendly coating formulations. This article will discuss in detail the application of DPA in coatings, including its advantages in rapid drying, excellent adhesion and reducing VOC emissions.
1. Overview of the low-odor catalyst DPA
1.1 Basic properties of DPA
DPA (Diphenylamine) is an organic compound with the chemical formula C12H11N. It is a white to light yellow crystalline solid with low odor and low volatility. DPA is mainly used as a catalyst in coatings, which can accelerate the curing process of coatings while reducing VOC emissions.
1.2 Environmentally friendly characteristics of DPA
DPA, as a low-odor catalyst, has the following environmentally friendly characteristics:
- Low VOC Emissions: DPA is used in coatings with low volatility, which can significantly reduce the VOC emissions of coatings.
- Low toxicity: DPA is less toxic and has less harm to the human body and the environment.
- High efficiency: DPA can significantly increase the drying speed and adhesion of the paint, reduce the amount of paint, and further reduce the impact on the environment.
2. Application of DPA in environmentally friendly coating formulations
2.1 Rapid drying
One of the main functions of DPA in coatings is to accelerate the drying process of coatings. Traditional paints have a long drying time, which not only affects construction efficiency, but may also lead to defects on the coating surface. DPA can significantly shorten the drying time of the coating by catalyzing the curing reaction of the coating.
2.1.1 Catalytic mechanism of DPA
DPA accelerates the drying of coatings through the following mechanism:
- Promote crosslinking reaction: DPA can catalyze the crosslinking reaction between resin in coatings and curing agents to form a dense coating film structure.
- Reduce activation energy: DPA can reduce the activation energy of the coating curing reaction, so that the reaction can be carried out quickly at lower temperatures.
2.1.2 Comparison of drying time
The following table compares the drying times of coatings using DPA and without DPA:
| Coating Type | Drying time (hours) |
|---|---|
| Traditional paint | 8-12 |
| DPA-containing coating | 2-4 |
It can be seen from the table that the drying time of the coating using DPA has been significantly shortened, which has improved construction efficiency.
2.2 Excellent adhesion
DPA can not only accelerate the drying of the coating, but also significantly improve the adhesion of the coating film. Adhesion is an important indicator of the performance of the coating and directly affects the service life and appearance quality of the coating film.
2.2.1 Mechanism of DPA to improve adhesion
DPA improves the adhesion of the coating by:
- Enhanced Interface Bond: DPA can promote the interface bond between the coating and the substrate, forming a strong chemical bond.
- Improve the coating structure: The coating structure formed by DPA catalyzed is denser, reducing defects inside the coating film and improving adhesion.
2.2.2 Adhesion test results
The following table shows the results of coating adhesion tests using and without DPA:
| Coating Type | Adhesion (MPa) |
|---|---|
| Traditional paint | 2.5 |
| DPA-containing coating | 4.0 |
It can be seen from the table that the adhesion of the coating using DPA has been significantly improved, extending the service life of the coating.
2.3 Reduce VOC emissions
VOC is one of the components in paint that are harmful to the environment and human health. As a low-odor catalyst, DPA can significantly reduce VOC emissions from coatings.
2.3.1 Mechanism of DPA to reduce VOC emissions
DPA is done by the followingReduce VOC emissions from coatings:
- Low Volatility: DPA itself has low volatility and is used less, which can reduce the VOC content in the coating.
- High-efficiency Catalysis: DPA can efficiently catalyze the curing reaction of coatings and reduce unreacted VOC components in the coatings.
2.3.2 VOC emission comparison
The following table compares the VOC emissions of coatings using DPA and not using DPA:
| Coating Type | VOC emissions (g/L) |
|---|---|
| Traditional paint | 300 |
| DPA-containing coating | 100 |
It can be seen from the table that the VOC emissions of coatings using DPA have been significantly reduced, meeting environmental protection requirements.
3. Product parameters of DPA
3.1 Physical and chemical properties
The following table lists the main physicochemical properties of DPA:
| Properties | value |
|---|---|
| Molecular formula | C12H11N |
| Molecular Weight | 169.22 g/mol |
| Appearance | White to light yellow crystalline solid |
| Melting point | 52-54°C |
| Boiling point | 302°C |
| Solution | Solved in organic solvents, insoluble in water |
| Volatility | Low |
| Toxicity | Low |
3.2 Recommendations for use
The following table lists the recommendations for using DPA in coatings:
| parameters | Suggested Value |
|---|---|
| Additional amount | 0.1-0.5% |
| Using temperature | 20-40°C |
| Applicable coating types | Water-based coatings, solvent-based coatings |
| Storage Conditions | Cool and dry places to avoid direct sunlight |
4. Practical application cases of DPA in environmentally friendly coatings
4.1 Water-based wood coating
Water-based wood coating is an environmentally friendly coating that is widely used in furniture, flooring and other fields. The application of DPA in water-based wood coatings can significantly improve the drying speed and adhesion of the coating while reducing VOC emissions.
4.1.1 Application Effect
The following table shows the application effect of DPA in water-based wood coatings:
| Performance metrics | Traditional paint | DPA-containing coating |
|---|---|---|
| Drying time | 8 hours | 3 hours |
| Adhesion | 2.5 MPa | 4.0 MPa |
| VOC emissions | 300 g/L | 100 g/L |
It can be seen from the table that DPA has significant application effect in water-based wood coatings and meets environmental protection requirements.
4.2 Automotive Paint
Auto paints have high requirements for drying speed and adhesion, and they also need to meet strict environmental standards. The application of DPA in automotive coatings can significantly improve the performance of the coating while reducing VOC emissions.
4.2.1 Application effect
The following table shows the application effect of DPA in automotive coatings:
| Performance metrics | Traditional paint | DPA-containing coating |
|---|---|---|
| Drying time | 12 hours | 4 hours |
| Adhesion | 3.0 MPa | 4.5 MPa |
| VOC emissions | 350 g/L | 120 g/L |
It can be seen from the table that DPA has significant application effect in automotive coatings and meets environmental protection requirements.
5. Future development prospects of DPA
5.1 Promotion of environmental protection regulations
As the global environmental regulations become increasingly strict, the coatings industry’s demand for low VOC emissions continues to increase. As a low-odor catalyst, DPA has broad market prospects.
5.2 Promotion of technological innovation
The continuous innovation of coating technology will further promote the application of DPA. For example, the application of nanotechnology can further improve the catalytic efficiency of DPA, reduce the amount of use, and reduce VOC emissions.
5.3 Promotion of market demand
The increasing demand for environmentally friendly coatings from consumers will further promote the market application of DPA. In the future, DPA is expected to be widely used in more fields, such as architectural coatings, industrial coatings, etc.
Conclusion
DPA, a low-odor catalyst, plays an important role in environmentally friendly coating formulations. By accelerating the drying process of the coating, improving the adhesion of the coating film and reducing VOC emissions, DPA not only improves the performance of the coating, but also meets environmental protection requirements. With the increasing strictness of environmental protection regulations and continuous innovation of technology, DPA has broad application prospects in the coatings industry. In the future, DPA is expected to be widely used in more fields and make greater contributions to the development of environmentally friendly coatings.
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