PET FIBER

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Product Descriptions：

Polyester fiber, also known as “polyester”, is a kind of synthetic fiber made by chemical polycondensation of organic dibasic acid and diol, which belongs to a kind of polymer compound. Its invention can be traced back to the 1930s, and now it is the most important synthetic fiber.

Performance and function:

Physical properties of polyester fiber

1. Color: Polyester is generally milky white with mercerization.
2. Surface and cross-sectional shape: The surface of conventional polyester is smooth, and the cross-section is generally close to circular.
3. Density: Generally, polyester has high crystallinity, and the density is between 1.38 and 1.40 g/cm.
4. Moisture regain: The moisture regain of polyester is 0.4% under standard conditions, which is lower than that of acrylic fiber (1%~2%) and nylon (4%).
5. Thermal properties: The softening point of polyester is 230-240℃, the melting point is 255-265℃, and the decomposition point is about 300℃.
6. Light resistance: Its light resistance is second only to acrylic fiber.
7. Electrical properties: Polyester has poor conductivity because of its low hygroscopicity. The dielectric constant in the range of -100℃ to +160℃ is 3.0~3.8, which is an excellent insulator.

Mechanical properties of polyester fiber

1. High strength: the strength is 4~7cN/dtex in dry state, and slightly decreased in wet state.
2. Moderate extensibility: generally 20%~50%.
3. High modulus: among synthetic fibers, polyester has the highest initial modulus, which can be as high as 14~17GPa.
4. Good resilience: its elasticity is close to wool.
5. Wear resistance: Its wear resistance is second only to nylon.

Chemical stability of polyester fiber

1. Acid resistance: Polyester is very stable to acids (especially organic acids).
2. Alkali resistance: the fiber will be damaged when it reacts with concentrated alkali at room temperature and dilute alkali at high temperature, and it will be more stable to dilute alkali or weak alkali only at low temperature.
3. Solvent resistance: Polyester has strong resistance to general nonpolar organic solvents, even to polar organic solvents at room temperature.
4. Microbial resistance: Polyester has good microbial resistance and is not easily eroded by moths and molds.

Application:

The main function of polyester fiber in asphalt concrete

1. Improve high-temperature stability: The three-dimensional distribution and strong adsorption performance of polyester fiber enable it to adsorb a large amount of free asphalt, increasing the viscosity and cohesion of asphalt.
2. Improve the low-temperature crack resistance: the strong adsorption of polyester fiber on asphalt leads to the increase of the optimum asphalt content, which makes the fiber asphalt mixture have higher asphalt content. This makes the mixture maintain flexibility and high tensile strength at low temperature (-40℃), effectively resist shrinkage stress, enhance the low-temperature crack resistance of the mixture, and reduce the generation of cracks and reflection cracks caused by temperature.
3. Improve fatigue resistance: Under the repeated action of external temperature environment and wheel load, asphalt pavement will produce fatigue fracture. The addition of polyester fiber can be evenly distributed in the mixture, and play a reinforcing role, improving the stiffness modulus of concrete, thus improving the fatigue resistance of asphalt concrete and slowing down the fatigue fracture of pavement.
4. Improve water stability: The water stability of asphalt pavement refers to the repeated actions of traffic load and temperature rise and fall in the presence of water. The addition of polyester fiber thickens the asphalt film and reduces the displacement effect of moisture on asphalt. At the same time, the adsorption of fiber increases the viscosity of asphalt, improves the bonding force between asphalt and aggregate, and enhances the ability of interfacial film formed between asphalt and aggregate in asphalt mixture to resist moisture stripping, thus improving the water stability of asphalt mixture.

Polyester is a kind of synthetic fiber with high strength, high modulus and low water absorption, so it is widely used in civil fabrics and industrial fabrics. As a textile material, polyester staple fiber can be both pure spun and blended with other fibers. It can be blended with natural fibers such as cotton, hemp and wool, and can also be blended with other chemical staple fibers such as viscose fiber, acetate fiber and polyacrylonitrile fiber. The spun cotton-like, wool-like and hemp-like fabrics usually retain the excellent characteristics of polyester, such as wrinkle resistance, dimensional stability, wear resistance and no deformation after washing. By blending hydrophilic fibers, some original shortcomings of polyester can be alleviated and improved to some extent, such as reducing static electricity, improving dyeing performance and enhancing air permeability.

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