Potential Effect of Delayed Low Odor amine Catalyst LED-204 on Improving Weather Resistance of Polyurethane Coatings

Introduction

Polyurethane coatings are widely used in construction, automobile, furniture and other fields due to their excellent mechanical properties, chemical stability and decorative properties. However, when polyurethane coatings are exposed to natural factors such as ultraviolet rays, humidity, and temperature changes in outdoor environments for a long time, they are prone to yellowing, powdering, cracking, etc., which affects its service life and aesthetics. Therefore, improving the weather resistance of polyurethane coatings has become one of the hot topics in research.

In recent years, as a new catalyst, the delayed low-odor amine catalyst LED-204 has attracted widespread attention in the field of polyurethane coatings due to its unique properties. This article will discuss in detail the potential impact of LED-204 on improving the weather resistance of polyurethane coatings, including its mechanism of action, product parameters, application effects, etc., and display relevant data in a table form so that readers can understand more intuitively.

1. Basic characteristics of LED-204 catalyst

1.1 Product Overview

LED-204 is a delayed low odor amine catalyst, mainly used in the curing process of polyurethane coatings. Its unique chemical structure makes it have low activity at room temperature, but it can be activated quickly under high temperature or ultraviolet irradiation, thereby achieving precise control of the curing process of polyurethane coating.

1.2 Product parameters

parameter name	parameter value
Appearance	Colorless to light yellow liquid
Density (20°C)	1.02 g/cm³
Viscosity (25°C)	50-100 mPa·s
Flashpoint	>100°C
Solution	Easy soluble in water, alcohols, and ketones
odor	Low odor
Active temperature range	50-120°C
Storage Stability	12 months (below 25°C)

1.3 Mechanism of action

The LED-204 catalyst affects the curing process of polyurethane coating through the following mechanism:

1. Delaying effect: At room temperature, LED-204 has low activity, which can extend the applicable life of polyurethane coating and facilitate construction operations.
2. Low-temperature activation: At above 50°C, the activity of LED-204 is rapidly improved, promoting the rapid curing of polyurethane coating.
3. Ultraviolet Response: LED-204 is sensitive to ultraviolet rays and can be activated by ultraviolet rays in outdoor environments, further improving the curing efficiency of the coating.

2. Effect of LED-204 on weather resistance of polyurethane coating

2.1 Improve UV resistance

Ultraviolet rays are one of the main factors that cause the aging of polyurethane coatings. LED-204 catalyst improves the UV resistance of the coating by:

1. Promote cross-linking reaction: LED-204 is rapidly activated under ultraviolet irradiation, promotes cross-linking reaction between polyurethane molecules, forms a denser network structure, and reduces the penetration of ultraviolet rays on the coating.
2. Absorbing UV rays: LED-204 itself has a certain ultraviolet absorption capacity, which can reduce the direct damage of ultraviolet rays to polyurethane molecules.

2.2 Enhanced humidity and heat resistance

Humidity and temperature changes are another important factor affecting the weather resistance of polyurethane coatings. LED-204 catalyst enhances the moisture and heat resistance of the coating by:

1. Improve crosslinking density: LED-204 promotes crosslinking reactions between polyurethane molecules, forms a denser network structure, and reduces the penetration of moisture and moisture.
2. Improving coating adhesion: LED-204 improves coating adhesion to substrate by precisely controlling the curing process, reducing coating peeling and cracking caused by moisture and heat.

2.3 Extend service life

By improving UV resistance and moisture heat resistance, the LED-204 catalyst significantly extends the service life of the polyurethane coating. Specifically manifested as:

1. Reduce yellowing: LED-204 reduces yellowing caused by ultraviolet irradiation by promoting cross-linking reactions and absorbing ultraviolet rays.
2. Preventing Powdering: LED-204 reduces the powdering phenomenon caused by moisture and heat and mechanical stress by increasing the crosslinking density and adhesion of the coating.
3. Delay cracking: LED-204 delays cracking caused by environmental stress by improving the mechanical properties and adhesion of the coating.

3. The performance of LED-204 in different application scenarios

3.1 Building exterior wall coating

In building exterior paints, LED-204 catalyst improves the weather resistance of the coating by:

1. Extend the application period: The delayed effect of LED-204 extends the application period of the paint and facilitates construction operations.
2. Rapid Curing: LED-204 is rapidly activated under high temperature or ultraviolet irradiation, promoting rapid curing of coatings and shortening construction cycle.
3. Improving UV resistance: LED-204 improves the UV resistance of the paint and extends its service life by promoting cross-linking reactions and absorbing UV rays.

3.2 Automotive Paint

In automotive coatings, LED-204 catalysts improve the weather resistance of the coating by:

1. Improving adhesion: LED-204 improves adhesion between the coating and metal substrate by precisely controlling the curing process, reducing coating peeling and cracking caused by environmental stress.
2. Enhanced moisture and heat resistance: LED-204 enhances the moisture and heat resistance of the coating by improving the crosslinking density and adhesion of the coating, reducing coating aging caused by humidity and temperature changes.
3. Extend service life: LED-204 extends the service life of automotive coatings by improving the UV resistance and moisture and heat resistance of the coating, and maintains the aesthetics of the car body.

3.3 Furniture paint

In furniture coatings, LED-204 catalyst improves the weather resistance of the coating by:

1. Improving wear resistance: LED-204 improves the wear resistance of the coating by promoting cross-linking reactions and reduces coating wear caused by daily use.
2. Enhanced moisture and heat resistance: LED-204 enhances the moisture and heat resistance of the coating by improving the crosslinking density and adhesion of the coating, reducing coating aging caused by humidity and temperature changes.
3. Extend service life: LED-204 extends the service life of furniture coatings by improving the UV resistance and moisture and heat resistance of the coating, maintaining furniture by improving the coating’s ultraviolet resistance and moisture and heat resistance.aesthetics.

IV. Comparison between LED-204 and other catalysts

4.1 Comparison with traditional amine catalysts

Features	LED-204	Traditional amine catalyst
odor	Low odor	High odor
Delaying effect	Significant	Not obvious
Low temperature activation	Above 50°C	Above 80°C
UV Response	Significant	Not obvious
Storage Stability	12 months (below 25°C)	6 months (below 25°C)

4.2 Comparison with organotin catalyst

Features	LED-204	Organotin Catalyst
Toxicity	Low toxic	High toxic
Delaying effect	Significant	Not obvious
Low temperature activation	Above 50°C	Above 60°C
UV Response	Significant	Not obvious
Storage Stability	12 months (below 25°C)	6 months (below 25°C)

V. Application cases of LED-204

5.1 Application cases of building exterior wall coatings

After a building exterior wall coating manufacturer uses LED-204 catalyst, the weather resistance of the coating is significantly improved, which is manifested as:

1. Reduced yellowing: After a year of outdoor exposure, the yellowing of the coatingThe index dropped from 5.0 to 2.5.
2. Reduced Powdering: After a year of outdoor exposure, the coating’s pulverization level has been reduced from Level 3 to Level 1.
3. Extended service life: The estimated service life of the coating is extended from 5 years to 8 years.

5.2 Automotive coating application cases

After a certain automobile coating manufacturer uses LED-204 catalyst, the weather resistance of the coating is significantly improved, which is manifested as:

1. Adhesion enhancement: The adhesion of the coating is increased from 5MPa to 8MPa.
2. Enhanced humidity and heat resistance: After 1000 hours of humidity and heat aging test, the adhesion retention rate of the coating has increased from 70% to 90%.
3. Extended service life: The estimated service life of the coating is extended from 10 years to 15 years.

5.3 Furniture coating application cases

After a furniture paint manufacturer uses LED-204 catalyst, the weather resistance of the paint is significantly improved, which is manifested as:

1. Abrasion resistance is improved: The wear resistance of the coating is increased from 1,000 frictions to 2,000 frictions.
2. Enhanced humidity and heat resistance: After 500 hours of humidity and heat aging test, the adhesion retention rate of the coating has increased from 60% to 85%.
3. Extended service life: The estimated service life of the coating is extended from 8 years to 12 years.

VI. Conclusion

The delayed low-odor amine catalyst LED-204 significantly improves the weather resistance of polyurethane coatings through its unique delaying action, low temperature activation and UV response characteristics. Its application cases in building exterior paints, automotive paints and furniture paints show that LED-204 can effectively reduce the yellowing, pulverization and cracking of the coating and extend the service life of the coating. Compared with traditional amine catalysts and organotin catalysts, LED-204 has the advantages of low odor, low toxicity and high storage stability, and is an ideal polyurethane coating catalyst.

Through detailed discussion in this article, I believe that readers have a deeper understanding of the potential impact of LED-204 catalysts in improving the weather resistance of polyurethane coatings. In the future, with the further research and application of LED-204 catalyst, its potential in the field of polyurethane coating will be more fully realized.

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