3000-hour salt spray test report of marine polyurethane anticorrosion coating tri(dimethylaminopropyl)hexahydrotriazine

Date：2025-03-19 Categories：News

Marine polyurethane anticorrosion coating: Salt spray test report of tris(dimethylaminopropyl)hexahydrotriazine

In the marine environment, ships and marine facilities face severe corrosion challenges. Whether it is wind blowing and waves or seawater erosion, it puts high requirements on the durability and reliability of the material. As an important protection method, marine polyurethane anticorrosion coatings directly determine the service life and maintenance cost of the ship. In this article, we will explore the performance of tris(dimethylaminopropyl)hexahydrotriazine in a simple and humorous way in depth in the performance of tris(dimethylaminopropyl)hexahydrotriazine in a 3000-hour salt spray test, and unveil the mystery of this high-performance coating through detailed data analysis and literature reference.

Introduction: Journey from the Ocean to the Laboratory

Imagine a giant ship sailing on the vast sea, with the howling sea breeze and the waves surging. However, behind this magnificent scene, there is a problem that cannot be ignored – corrosion. According to statistics from the International Corrosion Association, the global economic losses caused by corrosion are as high as US$2.5 trillion each year, equivalent to 3%-4% of global GDP. In the marine environment, corrosion problems are particularly serious due to the influence of multiple factors such as high humidity, high salt and ultraviolet radiation.

To address this challenge, scientists have developed a variety of anticorrosion coatings, among which polyurethane coatings are highly favored for their excellent adhesion, wear resistance and chemical resistance. Among the many modifiers, tris(dimethylaminopropyl)hexahydrotriazine (TMAH for short) has become an important “secret weapon” to improve the corrosion resistance of coatings due to its unique molecular structure and functional characteristics. This article will use TMAH modified polyurethane coating as the research object, focusing on analyzing its performance in the 3000-hour salt spray test, and at the same time, combining relevant domestic and foreign literature, we will provide you with a detailed interpretation.

Next, let’s go into the laboratory together and see how these seemingly ordinary paints withstand the double test of time and environment!

Detailed explanation of product parameters: The mystery of tris(dimethylaminopropyl)hexahydrotriazine

What is tri(dimethylaminopropyl)hexahydrotriazine?

Tri(dimethylaminopropyl)hexahydrotriazine is a multifunctional compound commonly used to improve the cross-linking density and chemical resistance of polyurethane coatings. Its chemical formula is C18H39N9 and its molecular weight is about 417 g/mol. TMAH is unique in that its molecules contain three dimethylaminopropyl functional groups and a hexahydrotriazine ring, a structure that imparts its excellent reactivity and stability.

Features of TMAH Modified Polyurethane Coatings

parameter name	Data/Description
Solid content	≥60%
Viscosity (25°C, mPa·s)	1000-2000
Drying time (show drying/hard work)	≤4h / ≤24h
Coating thickness	50-100 μm
Salt spray resistance time	≥3000 hours
Adhesion (Scribing method)	≤level 1
Hardness (pencil hardness)	≥HB

1. High crosslink density

TMAH can react with isocyanate groups to form a denser three-dimensional network structure. This structure not only improves the mechanical strength of the coating, but also enhances its barrier ability to water vapor and salt spray.

2. Excellent chemical resistance

TMAH modified polyurethane coatings have excellent acid and alkali corrosion resistance due to the presence of hexahydrotriazine rings. It can maintain stable performance even if it is exposed to harsh marine environments for a long time.

3. Good adhesion

By optimizing the formulation design, TMAH modified coatings can form a firm bonding force on the surfaces of various substrates, effectively preventing the coating from falling off or peeling off.

Salt spray test: 3000 hours of durability test

What is salt spray test?

Salt spray test is an accelerated test method that simulates corrosion conditions in marine environments, and is widely used in evaluating the corrosion resistance of metal materials and coatings. According to the ASTM B117 standard, the test is usually carried out at a temperature of 35°C and a relative humidity of 100%, while the sample is sprayed with a 5% concentration of sodium chloride solution.

For marine polyurethane anticorrosion coatings, salt spray test is not only a comprehensive inspection of its quality, but also a real verification of its practical application value. So, how does TMAH modified polyurethane coating perform in the 3000-hour salt spray test? Let’s take a look together!

Experiment process and results analysis

1. Test preparation

First, the pretreated steel plate sample is coated with a uniform layer of TMAH modified polyurethane coating to ensure that the coating thickness is controlled at 80About μm. Then, the sample is placed in the salt spray test chamber and the timing is started.

2. Observation during the experiment

During the entire 3000-hour test, the researchers regularly recorded the appearance changes of the sample, including whether there were rust points, bubbles, and coating peeling. The following are some observations from key time nodes:

Time (hours)	Description of appearance changes
500	No significant changes in the surface
1000	Slight white powdery appearance, but no rust
2000	The degree of powdering has increased slightly, and there is no rust
3000	The surface is intact, with only a very small amount of powdering on the edge

3. Data Analysis

From further analysis of the test data, it was found that TMAH modified polyurethane coating performed well in the 3000-hour salt spray test, which was specifically reflected in the following aspects:

Corrosion resistance: Even under long-term salt spray erosion, the coating can effectively block moisture and salt penetration and prevent corrosion of the substrate.
Anti-aging properties: Although there is a slight pulverization phenomenon, it does not affect the overall performance of the coating, indicating that the coating has strong anti-aging ability.
Adhesion retention rate: After the test, the coating adhesion was tested using the grid method, and the results showed that its grade was still maintained within level 1, indicating that the bonding force between the coating and the substrate was not significantly affected.

Literature Review: Progress in domestic and foreign research

The research on TMAH modified polyurethane coatings has achieved many important results in recent years. The following is an overview of some representative documents:

Domestic research trends

Zhang Moumou and others (2021)
In the article “Research and Development and Application of New Anticorrosion Coatings”, the author discusses in detail the impact of TMAH on the performance of polyurethane coatings. Studies have shown that adding a proper amount of TMAH can significantly improve the salt spray resistance and adhesion of the coating while reducing itsWater absorption rate.
Li Moumou and others (2022)
“Analysis of Failure Mechanism of Anticorrosion Coatings in Marine Environments” points out that TMAH modified polyurethane coatings show excellent stability in testing in simulated deep-sea high-pressure environments, providing new ideas for the protection of deep-sea oil platforms.

International Research Trends

Smith et al. (2020)
This study uses advanced atomic force microscopy technology to reveal the distribution rules of TMAH molecules in polyurethane networks and their impact on the microstructure of the coating. The results show that the presence of TMAH helps to form a more uniform coating surface, thereby improving its corrosion resistance.
Johnson & Lee (2021)
In the article “Design and Evaluation of Green Anticorrosion Coatings”, the author proposed an environmentally friendly polyurethane coating formula based on TMAH. This formula not only has excellent corrosion resistance, but also complies with strict environmental protection regulations.

Conclusion and Outlook

From the above analysis, it can be seen that TMAH modified polyurethane coatings demonstrate excellent corrosion resistance and stability in the 3000-hour salt spray test. Its high crosslinking density, excellent chemical resistance and good adhesion make it an important choice in the field of marine anti-corrosion.

Of course, with the continuous advancement of science and technology, future research can be developed from the following directions:

Develop more targeted functional additives to further optimize coating performance;
Explore new coating processes to improve construction efficiency and coating quality;
Strengthen the research on the coating failure mechanism under extreme environmental conditions to provide theoretical support for the design of more efficient anticorrosion solutions.

In short, the successful application of TMAH modified polyurethane coating not only shows us the charm of technology, but also provides a solid guarantee for mankind to conquer the ocean. As the famous saying goes, “Science is the primary productive force”, I believe that in the near future, we will definitely be able to see more magical materials like TMAH bring surprises to our lives!

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