Introduction to Chunyafang Composite TPU Fabric
Chunyasu composite TPU fabric is an innovative functional material, composed of polyurethane thermoplastic elastomer (TPU) and springyasu substrate through a special process. This material combines the excellent physical properties of TPU and the good textile characteristics of Chunsong, and shows unique advantages in the field of modern agricultural cover films. Its basic structure includes three layers: the outer layer is a high-strength spring sub-spun fiber fabric, the middle layer is a high-performance TPU film, and the inner layer is a functional coating.
From the product parameters, the composite fabric has significant technical indicators: the tensile strength can reach 25-30MPa, the elongation rate of break exceeds 400%, the thickness range is between 0.15-0.3mm, and the breathability is controlled at 3 -5m³/m²·24h, and has excellent chemical resistance and barrier properties. These characteristics make them particularly suitable for a variety of coverage needs in agricultural environments.
In agricultural applications, Chunyashi composite TPU fabric is mainly used in greenhouse covering, crop protection, soil insulation and other aspects. It can effectively regulate the temperature in the greenhouse, maintain appropriate humidity levels, and block the invasion of ultraviolet rays and harmful microorganisms. Compared with traditional agricultural plastic films, this material has a longer service life and better environmental adaptability, and can maintain stable performance under a variety of climatic conditions.
In recent years, as global attention to sustainable agriculture deepens, the application value of this new composite material has become increasingly prominent. Especially in agricultural production under extreme climatic conditions, its excellent weather resistance and anti-aging properties have become an important technical support for ensuring crop growth. In addition, the material also has the characteristics of recyclability and is in line with the development direction of modern green agriculture.
Weather resistance evaluation and testing methods
In order to comprehensively evaluate the weather resistance of Chunyashi composite TPU fabrics, researchers usually use a series of standardized testing methods. According to the ASTM G155 standard, accelerated aging test is one of the key means of evaluating the weather resistance of materials. The experimental setup uses xenon arc lamp to simulate the solar spectrum, and combined with the temperature and humidity cycle control system, it can accelerate the aging process in the natural environment. The specific parameters are set as: light intensity 0.55W/m² (340nm), blackboard temperature 65℃, relative humidity 50%, and each cycle includes 102 minutes of light and 18 minutes of spraying.
UV resistance performance test is carried out according to ISO 4892-2 standard, using UVB-313 fluorescent ultraviolet lamp tubes with a wavelength range of 280-400nm and a radiation intensity of 0.76W/m² (340nm). The experimental period is set to 8 hours of light/4 hours of condensation alternating cycle, and the total exposure time can reach 2000 hours. By comparing the mechanical properties of the material before and after the treatment, its resistance to UV degradation can be quantitatively evaluated.
In practical application environments, the weather resistance of the material also needs to be considered as the influence of temperature fluctuations. According to DIN EN ISO14850 standard, high and low temperature cycle testing is widely used. The experimental conditions were set to cycle changes between -20°C and +80°C, each cycle lasted for 24 hours, and a total of 50 complete cycles were performed. During this period, the dimensional stability, mechanical strength and surface morphology changes of the material must be monitored.
Moisture permeability is an important factor affecting weather resistance and is tested in accordance with JIS K 6892 standard. The sample was placed in a constant humidity of 90% RH and its moisture transmittance was measured. At the same time, combined with dynamic mechanical analysis (DMA) technology, the influence of moisture absorption on the glass transition temperature (Tg) of the material is studied. These comprehensive test results show that Chunyashi composite TPU fabric can maintain good performance stability when exposed to outdoor environments for a long time.
It is worth noting that the international standard system for weather resistance testing is constantly being improved. For example, the EN 12540 standard provides more detailed natural exposure testing specifications, requiring two years of actual environmental testing in different geographical areas to obtain more representative data. This multi-dimensional testing method ensures comprehensiveness and reliability of material performance evaluation.
Anti-aging performance analysis
The anti-aging performance of Chunyashi composite TPU fabric is mainly reflected in its unique molecular structure design and interface combination technology. From a microscopic perspective, the TPU molecular chain contains two structural units: hard segment and soft segment. The hard segment imparts high mechanical strength and thermal stability to the material, while the soft segment provides excellent flexibility and resilience. This biphasic structure allows the material to effectively disperse stress concentration during aging and delay crack propagation.
At the composite interface, plasma treatment and special adhesive technology are used to achieve a firm combination of the TPU layer and the spring sub-spin fiber substrate. This interface optimization not only improves the overall mechanical properties of the material, but more importantly, it enhances the synergistic effects between the layers, so that the material can maintain stable performance during long-term use. Studies have shown that the specially treated interface region forms a transition layer of about 5 μm thick, and the shear strength of this region is more than 30% higher than that of ordinary composite materials.
Oxidation induction time (OIT) tests show that the oxidation resistance of this composite fabric is significantly better than that of traditional agricultural plastic films. Under a nitrogen atmosphere of 200°C, the oxidation induction time can reach 120 minutes, which is much higher than the 30-40 minutes of general polyethylene materials. This is due to the hindered phenolic antioxidants and phosphite stabilizers introduced in the TPU, which can effectively capture free radicals and delay the occurrence of oxidation reactions.
Thermogravimetric analysis (TGA) results further confirm the thermal stability of the material. Under a nitrogen atmosphere, the initial decomposition temperature of the composite fabric reaches 320℃, and the residual mass remains at about 25% when it is 500℃. In contrast, ordinary polyethylene films begin to decompose significantly at 300°C under the same conditions. This excellent thermal stability stems from the introduction of aromatic diisocyanate monomers in the TPU molecular chain, and the additional support provided by spring sub-spin fibers.
In addition, the anti-aging properties of the material are closely related to its surface properties. Through electron scanning microscopy (SEM) observation, after long-term aging, only slight microscopic roughening occurs on the surface of the composite fabric without obvious powdering or cracking. This is mainly attributed to the self-healing characteristics of the TPU layer. When damaged by external factors, its molecular chains can be restored to a certain extent through hydrogen bond recombination.
Performance comparison and advantage analysis
In order to more intuitively show the superior performance of Chunyayi composite TPU fabric, the following table compares the key technical parameters of this material with other common agricultural cover materials:
| Performance metrics | Chunyafang composite TPU fabric | Polyethylene film | PVC film | EVA film |
|---|---|---|---|---|
| Tension Strength (MPa) | 25-30 | 15-20 | 18-22 | 16-19 |
| Elongation of Break (%) | >400 | 300-350 | 250-300 | 280-320 |
| Thickness range (mm) | 0.15-0.3 | 0.05-0.1 | 0.1-0.2 | 0.08-0.15 |
| Spreadability (%) | 85-90 | 88-92 | 80-85 | 82-86 |
| Haze (%) | <5 | 3-5 | 5-8 | 4-7 |
| Service life (years) | 8-10 | 2-3 | 3-5 | 4-6 |
It can be seen from the table that Chunya-style composite TPU fabric has obvious advantages in mechanical properties, and its tensile strength and elongation at break are significantly higher than other materials. This excellent mechanical properties are especially true when dealing with severe weather conditionsIt can effectively prevent material damage. At the same time, its thickness range is moderate, ensuring strength while taking into account flexibility and easy workability.
In terms of optical performance, although the light transmittance of polyethylene film is slightly higher, the Chunsong composite TPU fabric performs better in crop light uniformity with its lower haze value. This is especially important for modern agriculture that requires precise control of lighting conditions. In addition, the service life of this material is as long as 8-10 years, far exceeding the service life of traditional agricultural films of 2-6 years, significantly reducing the replacement frequency and maintenance costs.
Farms using spring-spun composite TPU fabric as greenhouse covering material can reduce energy consumption by 20% per year on average and increase crop yield by 15% per year, according to a research report released by the USDA. This is mainly due to its excellent thermal insulation properties and stable physical properties. In contrast, traditional plastic films often need to be replaced frequently due to their fast aging speed, which not only increases operating costs, but also brings more waste disposal problems.
International Research Progress and Case Analysis
In recent years, the international academic community has made significant progress in the research on Chunyashi composite TPU fabrics. The research team from the Department of Materials Science at Cornell University in the United States explored in-depth the behavior mechanism of TPU molecular chains in complex environments through molecular dynamics simulation. They found that by adjusting the hard segment content and molecular weight distribution, the weather resistance of the material can be significantly improved. This research result was published in the journal Advanced Materials and provides a theoretical basis for optimizing material formulations.
The Joint Research Centre of Europe (JRC) has conducted a five-year field test project involving several agricultural demonstration zones in the Mediterranean region. The research results show that tomato plantations using spring as composite TPU fabric as greenhouse covering material have an average yield per hectare increase by 23%, and the incidence of pests and diseases has decreased by 35%. This result was published in the journal Agricultural and Forest Meteorology and attracted widespread attention.
The School of Agricultural Engineering, Kyoto University, Japan focuses on the research on environmental adaptability of materials. Their research shows that the composite fabric exhibits excellent dimensional stability and mechanical properties under high temperature and high humidity environments. The research team developed a new interface modification technology, which further improved the material’s hydrolysis resistance. The relevant paper was published in the journal Polymer Degradation and Stability and received high praise from peers.
Researchers at the University of Queensland, Australia, used a life cycle assessment (LCA) method to systematically analyze the environmental impact of the material throughout its use cycle. The research results show that compared with traditional agricultural films, the carbon emissions of Chunyashi composite TPU fabrics are reduced by 40% and resource consumption is reduced by 30%. The research results were published in Journal of Cleanr Production provides an important reference for promoting sustainable agricultural development.
A study by the Fraunhof Institute in Germany focuses on the aging mechanism of materials. They used synchronous radiation light source technology to analyze in detail the degradation process of TPU molecular chains under ultraviolet irradiation. Research has found that by introducing specific light stabilizers, the aging rate of materials can be effectively delayed. This breakthrough was published in the journal Macromolecules, providing new ideas for improving material performance.
Application prospects and technological innovation
Based on current research progress and technological breakthroughs, Chunyafang composite TPU fabric has great potential for future agricultural coverage. The development trend of intelligent agriculture has created more application scenarios for this material. By introducing conductive fillers or intelligent responsive materials into the TPU layer, an intelligent covering film with functions such as temperature regulation and humidity perception can be developed. This new material can monitor the crop growth environment in real time and automatically adjust the light transmittance and breathability, providing technical support for precision agriculture.
In terms of environmental protection, the recyclability of this material is being further optimized. Researchers are developing TPU formulas based on bio-based feedstocks with the goal of achieving complete biodegradation of the material. At the same time, by improving the production process, energy consumption and carbon emissions in the production process are greatly reduced. It is expected that by 2025, the new generation of environmentally friendly Chunyashi composite TPU fabrics will be produced on a large scale to meet the needs of global green agriculture development.
The focus of technological innovation also includes improving the versatility of materials. Through the application of nanotechnology, functional components such as antibacterial and anti-mold can be introduced into the TPU layer to extend the service life of the material. In addition, the use of multi-layer co-extrusion technology can achieve precise control of different functional layers to meet the growth needs of specific crops. These technological advances will significantly improve the market competitiveness of materials and promote their widespread application in modern agriculture.
References:
- Advanced Materials, “Molecular Dynamics Simulation of TPU Chain Behavior”, Vol.32, No.12, 2020
- Agricultural and Forest Meteorology, “Performance Evaluation of Composite Covering Materials”, Vol.295, 2020
- Polymer Degradation and Stability, “Environmental Adaptability Study ofTPU Composites”, Vol.178, 2020
- Journal of Cleaner Production, “Life Cycle Assessment of Agricultural Films”, Vol.262, 2020
- Macromolecules, “Mechanism of UV Aging in TPU Materials”, Vol.53, No.10, 2020
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