The difference between polyester full-dull filament and semi-dull filament:
The main difference between semi-dull slices and full-dull slices is the titanium dioxide content. The latter is more than 8 times the former. .
Full-dull polyester chips are high-value-added products in the domestic polyester market. Full-dull chips not only reduce the reflection and flicker of the fibers, but also make subsequent fibers have a soft luster, good deep dyeing properties, and fabric drape. It has the advantages of high durability and strong shielding performance, which can meet the needs of making high-end clothing. Extended information
Characteristics of full-dull and semi-dull polyester (polyester fiber):
1. Physical properties
①Color. Polyester is generally milky white with mercerization. To produce matte products, the matting agent TiO2 needs to be added before spinning. To produce pure white products, a whitening agent needs to be added. To produce colored yarns, pigments or dyes need to be added to the spinning melt.
②Surface and cross-sectional shape. Regular polyester has a smooth surface and a nearly circular cross-section. If special-shaped spinnerets are used, fibers with special cross-section shapes can be made, such as triangular, Y-shaped, hollow and other special-shaped cross-section filaments.
③Density. When polyester is completely amorphous, its density is 1.333g/cm3. When fully crystallized, it is 1.455g/cm3. Generally, polyester has a high degree of crystallinity and a density of 1.38~1.40g/cm3, which is similar to wool (1.32g/cm3).
④ Moisture regain rate. Under standard conditions, the moisture regain of polyester is 0.4%, which is lower than acrylic (1%~2%) and nylon (4%). Polyester has low hygroscopicity, so its wet strength decreases less, and the fabric has good washability and wearability; however, the electrostatic phenomenon is serious during processing and wearing, and the fabric has poor air permeability and hygroscopicity.
⑤Thermal performance. The softening point T of polyester is 230-240°C, the melting point Tm is 255-265°C, and the decomposition point T is about 300°C. Polyester can burn in fire, curl, and melt into beads, producing black smoke and aromatic smell.
⑥Lightfastness. Its light resistance is second only to acrylic. The light resistance of polyester is related to its molecular structure. Polyester only has a strong absorption band in the 315mm light wave region, so after 600 hours of sunlight exposure, the strength only loses 60%, which is similar to cotton.
⑦Electrical properties. Polyester has poor electrical conductivity due to its low hygroscopicity. Its dielectric constant is 3.0~3.8 in the range of -100~+160℃, making it an excellent insulator.
2. Mechanical properties
①High strength. The dry strength is 4~7cN/dex, while the wet strength decreases.
②The elongation is moderate, 20%~50%.
③High modulus. Among the large varieties of synthetic fibers, polyester has the highest initial modulus, which can be as high as 14 to 17 GPa. This makes polyester fabrics dimensionally stable, non-deformable, non-aliased, and durable in pleats.
④ Good resilience. Its elasticity is close to that of wool. When stretched by 5%, it can almost completely recover after load removal. Therefore, the wrinkle resistance of polyester fabrics exceeds that of other fiber fabrics.
⑤Wear resistance. Its wear resistance is second only to nylon and exceeds other synthetic fibers, and its wear resistance is almost the same.
3. Chemical stability. The chemical stability of polyester mainly depends on the molecular chain structure. In addition to poor alkali resistance, polyester has excellent resistance to other reagents.
①Acid resistance. Polyester is very stable to acids (especially organic acids). After being soaked in a hydrochloric acid solution with a mass fraction of 5% at 100°C for 24 hours, or soaked in a sulfuric acid solution with a mass fraction of 70% at 40°C for 72 hours, its strength will decrease. There is no loss, but it cannot resist the long-term action of concentrated nitric acid or concentrated sulfuric acid at room temperature.
②Alkali resistance. Because the ester groups on the polyester macromolecules are easily hydrolyzed by alkali. The fiber can be damaged by the interaction with concentrated alkali at normal temperature and dilute alkali at high temperature. It is relatively stable only at low temperature against dilute alkali or weak alkali.
③Solvent resistance. Polyester has strong resistance to general non-polar organic solvents and even to polar organic solvents at room temperature.
For example, the fiber strength does not decrease when soaked in acetone, chloroform, toluene, trichlorethylene, and carbon tetrachloride for 24 hours at room temperature. Under heating, polyester is soluble in mixed solvents such as phenol, xylenol, o-dichlorophenol, benzyl alcohol, nitrobenzene, phenol-carbon tetrachloride, phenol-chloroform, and phenol-toluene.
4. Microbial resistance.
Polyester is resistant to microorganisms and is not affected by moths, molds, etc. There is no need to protect polyester clothes from moths, and it is easier to store fabrics.
Baidu Encyclopedia - Semi-dull Polyester
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