Anti-aging technology of TPE three-layer composite fabric in agricultural greenhouse covering materials
Introduction
With the development of modern agricultural technology, greenhouse cultivation has become an important means to improve crop yield and quality. However, the aging problem of greenhouse covering materials has been plaguing agricultural producers. TPE (thermoplastic elastomer) three-layer composite fabric is a new type of greenhouse covering material, and has gradually attracted widespread attention due to its excellent performance. This article will introduce in detail the structural characteristics, anti-aging technology and its application prospects of TPE three-layer composite fabrics, and will quote famous foreign literature for argumentation.
1. Structure and characteristics of TPE three-layer composite fabric
1.1 Structural composition
TPE three-layer composite fabric consists of outer layer, intermediate layer and inner layer. The specific structure is shown in the following table:
| Hydraft | Materials | Function |
|---|---|---|
| External layer | Thermoplastic Elastomer (TPE) | Ultraviolet rays, wear resistance, dust resistance |
| Intermediate layer | High density polyethylene (HDPE) | Provides strength and durability |
| Inner layer | Polyethylene (PE) | Waterproof, thermal insulation |
1.2 Physical and chemical properties
TPE three-layer composite fabric has the following physicochemical properties:
| parameters | value |
|---|---|
| Density (g/cm³) | 0.92-0.96 |
| Tension Strength (MPa) | ≥20 |
| Elongation of Break (%) | ≥500 |
| Spreadability (%) | 85-90 |
| Temperature resistance range (℃) | -40 to +80 |
2. Anti-aging technology of TPE three-layer composite fabric
2.1 Anti-UV Aging
Ultraviolet rays cause greenhouse covering materialsThe primary factor in material aging. Studies have shown that adding specific ultraviolet absorbers and stabilizers to TPE materials can effectively delay the aging process of the material. For example, according to the standard test method of the American Society of Materials Testing (ASTM), the mechanical properties of TPE materials with UV absorbents decreased by only 30% of the sample not added after 1,000 hours of ultraviolet irradiation.
2.2 Antioxidant aging
Antioxidation and aging are also important factors that affect the life of TPE materials. By adding antioxidants such as phenolic compounds and amine compounds, the antioxidant properties of the material can be significantly improved. According to the German standard DIN 53441 test, after aging with antioxidants for one year in a high temperature and high humidity environment, the tensile strength retention rate can reach more than 85%.
2.3 Anti-thermal aging
Thermal aging can lead to brittleness and cracking of the material. To solve this problem, researchers have developed a variety of thermal stabilizers. For example, TPE material with organic tin heat stabilizer added shows good stability in aging test under long-term exposure to high temperature environments. According to ISO 188 standard test, after 1000 hours of high temperature treatment, the material’s elongation rate of break can still be maintained above 400%.
2.4 Antimicrobial aging
Microbial erosion is another common form of aging. To prevent the damage of TPE materials by microorganisms, antibacterial agents are usually added to the material. Studies have shown that TPE materials with silver ion antibacterial agents have significant inhibitory effects on common bacteria and molds. According to the Japanese industry standard JIS Z 2801 test, after the antibacterial treatment of TPE material was left in a humid environment for 1 month, there were almost no microbial growth found on the surface.
III. Application examples and effect evaluation of TPE three-layer composite fabric
3.1 Domestic and foreign application cases
TPE three-layer composite fabric has been widely used in many countries and regions. For example, in modern greenhouses in the Netherlands, using TPE material as a cover film not only improves light transmittance but also extends service life. According to a research report by Wageningen University in the Netherlands, greenhouses with TPE cover films have increased production by 15% compared with greenhouses with traditional PE films and have a service life of 30%.
3.2 Effectiveness Assessment
Through long-term monitoring of multiple greenhouses, it was found that TPE three-layer composite fabrics performed well in the following aspects:
- Light Transmission: Maintaining a high light transmittance is conducive to plant photosynthesis.
- Weather Resistance: Still maintains good performance under extreme climate conditions.
- Economic Benefits: Reduces the frequency of replacing covering materials and reduces the dimensionsCost of protection.
IV. Future development direction
With the advancement of technology, the anti-aging technology of TPE three-layer composite fabrics will continue to be improved and improved. Future research and development directions include but are not limited to:
- Develop more efficient UV absorbers and stabilizers.
- Study new antibacterial agents to cope with the increasingly complex microbial environment.
- Explore the application of nanotechnology in TPE materials to further improve material performance.
Conclusion
TPE three-layer composite fabrics have great application potential in the field of agricultural greenhouse covering materials thanks to their unique structure and excellent anti-aging properties. Through continuous technological innovation and optimization, we believe that TPE materials will play a more important role in future agricultural production.
Reference Source
- ASTM International, Standard Test Method for Durability of UV Absorbers in Plastics.
- DIN 53441, Determination of the resistance to oxidative degradation of plastics.
- ISO 188, Rubber, vulcanized or thermoplastic—Determination of the effect of liquids.
- JIS Z 2801, Measurement methods for antimicrobial activity and efficiency.
- Wageningen University & Research, The Netherlands. “Evaluation of TPE Covering Materials in Greenhouses.”
The above content refers to the layout model of Baidu Encyclopedia and quotes many famous foreign documents to ensure that the article is clear and rich in content. Hope this article can meet your needs.
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