DIN 45673-1 test of high-speed railway shock absorbing pad tri(dimethylaminopropyl)hexahydrotriazine catalytic system

Introduction: A contest about vibration

In the world of high-speed railways, speed and comfort are like a lover who loves each other. On the one hand, we hope that the train can speed like a cheetah; on the other hand, we hope that the passengers in the car can enjoy a stable experience as if they were as smooth as a lake. However, reality is often not so beautiful – when the train whistles by at a speed of 300 kilometers per hour, the vibration between the track and the roadbed will be transmitted into the car through various channels, affecting the riding experience. To solve this problem, engineers designed a magical “cushion master” – shock absorber pads.

In this contest about vibration, a special chemical substance quietly appeared, which is tris(dimethylaminopropyl)hexahydrotriazine (THA for short). This compound is not only a difficult name, but also attracts great attention for its excellent catalytic properties. This article will discuss the THA catalytic system in high-speed railway shock absorbing pads, and focus on its testing performance under the DIN 45673-1 standard. This is a journey full of technical details, scientific charm and interesting interpretations. Let’s explore it together!

Next, we will analyze in-depth from the following aspects:

1. Basic Principles of THA Catalytic System
2. The standard and significance of DIN 45673-1 test
3. Standard Analysis of Shock Absorbing Pad Products
4. The current situation and prospects of relevant domestic and foreign research

Don’t worry, although the content is professional, I will use easy-to-understand language and funny metaphors to take you into this seemingly complex but full of wisdom.

The basic principles of THA catalytic system: the hero behind chemical magic

What is tri(dimethylaminopropyl)hexahydrotriazine?

Tri(dimethylaminopropyl)hexahydrotriazine (THA) is a multifunctional organic compound with a unique cyclic structure and three active amino functional groups. Its molecular formula is C9H21N5 and its molecular weight is about 227 g/mol. The reason why THA can shine in the field of shock absorber pads is mainly because it has excellent catalytic activity and reaction selectivity.

Imagine THA is like a skilled chef who can accurately control every step in complex chemical reactions. It reacts through cross-linking with epoxy groups in the epoxy resin to form a solid and flexible three-dimensional network structure. This network structure gives the shock absorber excellent mechanical properties, allowing it to withstand great pressureAt the same time, maintain good elasticity.

Mechanism of action of catalytic system

The core of the THA catalytic system is to promote the curing process of epoxy resin. Specifically, the amino functional groups in THA can undergo ring-opening reaction with the epoxy groups to form hydroxyl groups and new azocyclic intermediates. These intermediates will further participate in subsequent reactions and eventually form a highly crosslinked polymer network.

The following are the main features of the THA catalytic system:

In addition, THA can work in concert with other additives, such as plasticizers, fillers and antioxidants, further optimizing the overall performance of the shock absorber pad.

Advantages in practical applications

In high-speed railway shock absorbing pads, the THA catalytic system brings the following significant advantages:

1. Enhanced shock absorption effect: The cured material exhibits excellent dynamic mechanical properties and can effectively absorb and disperse high-frequency vibrations generated during train operation.
2. Extend service life: Because the crosslinking network formed by THA is highly fatigue-resistant and anti-aging, the service time of the shock absorber pad is greatly extended.
3. Simplify production process: THA’s efficient catalytic characteristics make the entire production process easier, reduce costs and improve efficiency.

DIN 45673-1 Test: Touchstone of shock absorber pad performance

What is DIN 45673-1?

DIN 45673-1 is one of a series of specifications for testing vibration isolation components of railway vehicles formulated by the German Industrial Standards Association (DIN). This standard aims to evaluate the performance of shock absorber pads under actual working conditions, including key indicators such as dynamic stiffness, damping coefficient, and frequency response..

Simply put, DIN 45673-1 is like a strict test paper to test whether the shock absorber has the ability to deal with complex vibration environments. Only products that pass this test can be recognized as qualified high-speed railway shock absorption solutions.

Testing Methods and Evaluation Standards

According to the requirements of DIN 45673-1, the shock absorber pad needs to undergo a series of rigorous tests, mainly including the following aspects:

1. Dynamic stiffness test

Dynamic stiffness refers to the ability of the shock absorber pad to resist deformation when subjected to periodic loads. During the test, the sample will be installed on a specially designed test bench and the sine wave excitation force of different frequencies and amplitudes is applied. By measuring the relationship between input force and output displacement, the dynamic stiffness value can be calculated.

Where (F ) represents the input force, (Delta x ) represents the displacement change amount, (P_{loss} ) represents the energy loss, and (omega ) represents the angular frequency.

2. Damping performance test

Damping performance reflects the vibration energy absorption capacity of the shock absorber pad. Usually measured by the loss factor (Loss Factor), the higher its value, the better the damping effect of the material.

3. Frequency response test

????????????????????????? Ideally, the shock absorbing pad should have effective shock absorption capabilities of a wide band, which can not only suppress low-frequency resonance but also attenuate high-frequency noise.

Test results analysis

To better understand the performance of THA catalytic system in the DIN 45673-1 test, we can perform a comparative analysis through the following table:

From the data, it can be seen that the THA catalytic system has obvious advantages in terms of dynamic stiffness, damping performance and frequency response.

Shock Absorbing Pad Product Parameters: The Secret Behind Numbers

Core parameters at a glance

A good shock absorbing pad product, its performance parameters directly determine its performance in actual applications. The following are some typical parameters of shock absorber pads developed based on THA catalytic system:

Parameter optimization strategy

In order to further improve the comprehensive performance of shock absorber pads, R&D personnel usually take the following measures:

1. Adjust the amount of THA added: Determine the best amount through experiments to balance the curing speed and final material properties.
2. Introduction of functional fillers: such as carbon fiber or glass microbeads, can significantly improve the mechanical strength of the material andWear resistance.
3. Improving production process: Adopt advanced kneading technology and molding process to ensure uniform internal structure of the material.