Abstract:What raw material is polyester made of
Polyester fiber, commonly known as "polyester". It is a synthetic fiber obtained ...
Polyester fiber, commonly known as "polyester". It is a synthetic fiber obtained by spinning polyester obtained by polycondensation of organic dibasic acid and dibasic alcohol, referred to as PET fiber, which belongs to polymer compounds. Invented in 1941, it is currently the largest variety of synthetic fibers. The biggest advantage of polyester fiber is that it has good wrinkle resistance and shape retention, and has high strength and elastic recovery ability. It is strong and durable, anti-wrinkle and non-ironing, and non-sticky.
The main function of polyester fiber:
1. Improve high-temperature stability and increase high-temperature stability. Due to the three-dimensional distribution of polyester fiber monofilament, it has strong adsorption with asphalt and does not entangle. It can absorb too much free asphalt and make the viscosity of asphalt At the same time, due to the crisscross reinforcement and bridging effect, the flow performance of asphalt is reduced, the lateral displacement or flow of aggregate is limited, the high temperature stability is effectively improved, and the stability of fiber asphalt concrete degree has been greatly improved.
2. Improve the crack resistance at low temperature, and the adsorption of fiber to asphalt leads to an increase in the optimal amount of asphalt in asphalt concrete. Higher asphalt content makes the fiber asphalt mixture maintain flexibility and higher at a low temperature of -40°C High tensile strength, effective resistance to shrinkage stress, enhance the low temperature crack resistance of the mixture, reduce the generation of temperature shrinkage cracks and prevent the development of reflective cracks.
3. Improve anti-fatigue performance Asphalt pavement is subjected to repeated wheel loads under the action of external temperature environment. When the load is repeated for more than a certain number of times, the stress generated in the pavement under the load will exceed the structural resistance of the reduced strength. Cracks appear on the pavement, leading to fatigue fracture damage. After adding polyester fiber, the uniform distribution of fiber monofilament in the mixture increases the stiffness modulus and improves the fatigue resistance of asphalt concrete.
4. Improve water stability The water stability of asphalt pavement refers to the repeated action of traffic load and temperature expansion and contraction of asphalt pavement in the presence of water. The addition of polyester fibers thickens the asphalt film, reduces the strength of water-displaced asphalt, and reduces the amount of water infiltrated into asphalt concrete. In addition, the adsorption of fibers increases the viscosity of asphalt, which improves the asphalt and asphalt. The bonding force of the aggregate strengthens the ability of the interface film formed by the asphalt and the aggregate in the asphalt mixture to resist moisture stripping, thereby improving the water stability of the asphalt mixture.