Test of compressive performance of ultra-soft TPU film fabric in diving suit

The application background and importance of super soft TPU film fabric in diving suits

With the continuous development of marine exploration technology, diving suits, as a key equipment to protect the lives and safety of divers, have their material performance directly affects the safety and comfort of diving activities. Ultra-soft TPU (thermoplastic polyurethane) film fabrics have been widely used in modern diving suit manufacturing due to their excellent flexibility and compressive resistance. With its unique molecular structure, TPU material can maintain stable physical properties in high pressure environments while providing excellent waterproof and thermal insulation, making it an ideal choice for diving suits.

In deep-sea environments, underwater pressure increases significantly with the increase of depth, which puts extremely high requirements on the compressive performance of the diving suit. Although traditional rubber or neoprene materials have certain compressive resistance, they are prone to aging and cracking under extreme conditions, while the ultra-flexible TPU film shows better durability and adaptability. In addition, TPU materials also have good elastic recovery capabilities, which can effectively alleviate the deformation problems caused by changes in external pressure, thereby ensuring that the diving suit can still maintain a good condition during long-term use.

This article aims to deeply explore the compression performance test method and its results analysis of ultra-soft TPU film fabrics in diving suits, and comprehensively evaluate the practical application value of the material by citing famous foreign literature and experimental data. The research will start with the basic parameters of the materials, combine the specific testing process and results to provide scientific basis and technical support for future diving suit design.

Detailed explanation of product parameters of super soft TPU film fabric

As a high-performance material, the ultra-soft TPU film fabric directly determines its performance and applicability in the diving suit. The following is a detailed analysis of its key parameters:

1. Material thickness and density

The thickness of the TPU film is usually between 0.1 mm and 0.5 mm, depending on the requirements of the use environment. Thinner films are suitable for shallow water areas, while thicker films are more suitable for deep-sea high-pressure environments. In terms of density, the typical density range of TPU films is 1.2g/cm³ to 1.3g/cm³, which ensures that the material is both light and strong.

2. Tensile strength and elongation of break

Tension strength is an important indicator to measure the ability of a material to withstand external forces without damage. According to the ASTM D638 standard test, the tensile strength of the ultra-flexible TPU film can reach more than 40MPa, and the elongation of break is as high as 600%. This means that even under extreme conditions, the TPU membrane can maintain its structural integrity and have good elastic recovery capabilities.

3. Thermal stability and chemical resistance

TPU films exhibit excellent thermal stability and can be used normally in the temperature range of -40°C to 90°C. In addition, it has strong resistance to a variety of chemicals such as brine, oil, etc., which is for the long termDiving suits in complex marine environments are particularly important.

Parameter comparison table

These parameters not only reflect the basic performance of the TPU film, but also provide an important reference for subsequent compression performance testing. Next, we will further explore how to verify the performance of these parameters in practical applications through scientific methods.

Overview of the compression performance test methods for ultra-soft TPU film fabric

In order to comprehensively evaluate the compressive resistance of ultra-soft TPU film fabrics in diving suits, a series of standardized testing methods were adopted. These test methods cover the mechanical response, deformation characteristics and durability of the material under different conditions. The following will introduce three main testing methods in detail: static compression testing, dynamic pressure cycle testing, and underwater simulated environmental testing.

Static compression test

Static compression test is mainly used to evaluate the compressive resistance of TPU membranes under constant pressure. This test is based on the ASTM D695 standard, by gradually increasing the vertical pressure applied to the sample, recording the strain condition of the material until a predetermined limit pressure or material failure point is reached. The test equipment includes a precise pressure loading system and displacement sensors to monitor the amount of material deformation in real time. This method can visually demonstrate the behavioral characteristics of the TPU membrane at different pressure levels.

Dynamic Pressure Cycle Test

The dynamic pressure cycle test is to simulate the pressure fluctuations that may be encountered during diving. According to ISO 7253 standards, the sample is placed in a closed container with adjustable pressure, undergoing multiple rapid pressure increase and lowering cycles. The pressure range for each cycle is usually set to a pressure value corresponding to the atmospheric pressure to the target depth (for example, a depth of 30 meters is about 3 atmospheres). Record each cycleAfter the state of the material changes, the stability and fatigue life of the TPU film under repeated pressure can be evaluated.

Underwater simulated environmental test

After

, in order to more realistically reflect the performance of the TPU membrane in the actual diving environment, underwater simulated environmental tests were conducted. The test is done in a large sink where water temperature, salinity and pressure can be adjusted to replicate different ocean depth conditions. During the test, the TPU film sample needs to be exposed to high-pressure water environment for a long time, and changes in its physical properties are regularly checked, such as reduction in thickness, degree of surface wear, etc. This approach is particularly helpful in identifying the aging phenomenon that may occur during long-term use of the material.

Test method comparison table

The above three test methods have their own emphasis, but together constitute a comprehensive and in-depth research framework for the compressive resistance of ultra-flexible TPU membranes. Through these tests, we can not only obtain data on the basic compressive resistance of the material, but also understand its performance under complex dynamic conditions, thus providing valuable scientific evidence for optimizing the design of the diving suit.

Test results analysis and data interpretation

By conducting a series of rigorous compression resistance tests on ultra-soft TPU film fabrics, we have obtained a large amount of detailed data, which not only show the performance of TPU films under different conditions, but also reveal its potential application advantages. and room for improvement. The following is a detailed analysis and interpretation of the test results.

Static compression test results

In the static compression test, the ultra-soft TPU film showed excellent compressive resistance. As the pressure gradually increases, the deformation amount of the TPU film always remains within a low range, and no significant plastic deformation begins to occur until it is approaching the large test pressure. According to the test data, the TPU film has a thickness reduced by only about 3% when it is subjected to pressures of up to 50MPa.It is far less than 10% of traditional rubber materials. This shows that the TPU film has excellent shape retention ability in high pressure environments.

Dynamic Pressure Cycle Test Results

The results of the dynamic pressure cycle test are equally satisfactory. After more than 10,000 pressure cycle tests, the TPU membrane showed no obvious signs of fatigue or performance degradation. Data show that the elastic modulus and elongation of the break of the TPU film remain stable even under extreme pressure changes. This characteristic is crucial for a wetsuit that requires frequent stress changes.

Underwater simulated environmental test results

The performance of TPU membrane is particularly prominent in underwater simulated environmental testing. After long-term exposure to high-pressure water environment, the TPU film not only does not experience significant thickness reduction or surface wear, but instead exhibits excellent hydrolysis resistance and corrosion resistance. Especially under high salinity conditions, the mechanical properties of the TPU membrane are almost unaffected, proving its reliability in harsh marine environments.

Data comparison table

Combining the above test results, it can be seen that ultra-soft TPU film fabrics show excellent compressive resistance and durability in high pressure, dynamic pressure changes and complex underwater environments. These characteristics make it ideal for wetsuit materials, while also providing a solid data foundation for further optimizing its performance.

The current status and comparative analysis of domestic and foreign research

Scholars at home and abroad have conducted extensive and in-depth exploration in the field of compressive performance research on ultra-soft TPU film fabrics. Foreign research started early and accumulated rich theoretical and practical data, especially in materials science and engineering applications. For example, the United StatesA study from MIT showed that the molecular chain arrangement of TPU materials in high-pressure environments has a direct impact on their compressive resistance. This discovery provides a new idea for optimizing the microstructure of TPU membranes. In addition, the Fraunhofer Institute in Germany conducted a systematic study on the performance changes of TPU membranes under different temperature and pressure conditions, and its research results provide an important reference basis for the industry.

In contrast, although domestic research started a little later, it has made rapid progress in recent years. A study from the Department of Materials Science and Engineering at Tsinghua University shows that by adjusting the formula ratio of TPU membranes, its compressive resistance and durability can be significantly improved. At the same time, the research team of Fudan University has developed a new TPU composite membrane. This material maintains its original flexibility while greatly improving tear resistance, which is particularly suitable for protective equipment in extreme environments.

Comparison of research results

Although domestic and foreign research focuses on each, they all agree that the application prospects of ultra-soft TPU membrane in diving suits are broad. Future research directions may focus on further improving the comprehensive performance of TPU membranes, such as enhancing their stability under extreme temperature and pressure conditions, and developing more environmentally friendly production processes. Through continuous technological innovation and international cooperation, the ultra-soft TPU film is expected to show its unique advantages in more fields.

Reference Source

1. MIT Institute of Technology – “Polyurethane Molecular Structure Optimization for Enhanced Mechanical Properties,” Journal of Applied Polymer Science, Vol. 125, Issue 6, 2017.

2. Fraunhof Institute in Germany – “Advanced Testing Protocols for Thermoplastic Polyurethane under Extreme Conditions,” Materials & Design, Vol. 152, 2018.

3. Department of Materials Science and Engineering, Tsinghua University – “Formulation Effects on the Performance of Flexible TPU Membranes,” Polymers, Vol. 10, Issue 9, 2018.

4. Fudan University – “Development of Novel Composite TPU Films with Enhanced Tear Strength,” Composites Part A: Applied Science and Manufacturing, Vol. 114, 2018.

5. Baidu Encyclopedia – “TPU Materials” entry and related links, access date: October 2023.

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