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CN-121992526-A - Polyester and polyamide composition, fiber, fabric and preparation method

CN121992526ACN 121992526 ACN121992526 ACN 121992526ACN-121992526-A

Abstract

The invention relates to a polyester and polyamide composition, fiber, fabric and a preparation method. The composition comprises polyester and polyamide, wherein the polyester contains diethylene glycol, and a plurality of molecular chain ends of the polyamide contain groups-NH 2 , wherein the mass of the diethylene glycol accounts for n percent of the total mass of the polyester and the polyamide, n is less than or equal to 1.5, the content of-NH 2 in the polyamide is m mol/kg, and m is more than or equal to 10. According to the invention, by adopting the combination of the bio-based polyamide and the polyester with different amino-terminated contents, the diethylene glycol content in the mixture system is controlled so that each performance of the fiber product reaches a good balance, and the fiber product which can be stably produced is obtained, and has good fuzzing and pilling resistance, mechanical property, elasticity, dyeability and dyeing fastness.

Inventors

  • SUN CHAOXU
  • Feng Guanchen
  • LIU XIUCAI

Assignees

  • 上海凯赛生物技术股份有限公司
  • CIBT美国公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (16)

  1. 1. A composition comprising a polyester and a polyamide, said polyester comprising diethylene glycol and said polyamide comprising groups-NH 2 at the ends of several molecular chains, wherein: the mass of the diglycol accounts for n% of the total mass of the polyester and the polyamide, and n is less than or equal to 1.5; The content of-NH 2 in the polyamide is m mol/kg, and m is more than or equal to 10.
  2. 2. The composition of claim 1, wherein the intrinsic viscosity of the polyester is 0.4 to 0.9dl/g, further 0.5 to 0.75dl/g.
  3. 3. The composition of claim 1, wherein the polyamide has a relative viscosity of 35 to 63.
  4. 4. The composition according to claim 1, wherein the mass ratio of polyamide to polyester in the composition is (5-40): (60-95), further (15-40): (60-85).
  5. 5. The composition of claim 1, wherein n is 1.15 or less, further wherein n is 1.08 or less, further wherein n is 1.0 or less, further wherein n is 0.9 or less, further wherein n is 0.75 or less, further wherein n is 0.7 or less.
  6. 6. The composition of claim 1 or 5, wherein n is ≡0, further wherein n is ≡0.2.
  7. 7. The composition of claim 1, wherein m is greater than or equal to 30, further wherein m is greater than or equal to 60, further wherein m is greater than or equal to 80.
  8. 8. The composition of claim 1 or 7, wherein m is less than or equal to 200, further wherein m is less than or equal to 150.
  9. 9. The composition of claim 1 or 5 or 7, wherein 0.75< n≤1.15, and m≥30.
  10. 10. The composition of claim 1 or 5 or 7, wherein n≤0.75, and m≥30.
  11. 11. The composition of claim 1 or 5 or 7, wherein 1.15< n≤1.6 and m≥80.
  12. 12. The composition of claim 1, wherein the diethylene glycol content of the polyester is 0.4% -1.6%, further 0.4% -1.1% or 0.7% -1.1%.
  13. 13. A fiber, the raw material of which comprises the composition of any one of claims 1 to 12.
  14. 14. The fiber according to claim 13, wherein the breaking strength of the fiber is 2.0 to 4.5, further 3.0 to 4.5cN/dtex, and/or, The elongation at break is 30% -55%, further 36% -55%, and/or, A constant elongation elastic recovery of 5% or more, further 80% or more, further 87% or more, further 90% or more, and/or, A 15% constant elongation elastic recovery of 60% or more, more preferably 70% or more, more preferably 85% or more, more preferably 88% or more, and/or, The dye uptake is 65% or more, more preferably 85% or more, more preferably 90% or more, more preferably 97% or more, and/or, A wicking height of 13mm or more, further 25mm or more, further 45mm or more, further 55mm or more, and/or, The drip diffusion time is 1 to 30s, further 1 to 18s, further 1 to 10s, and/or, The color fastness grade is 3-5, further 4-5, further 4.5-5, and/or, The fuzzing and pilling resistant grade is 2-5, further 3.5-5, and further 4-5.
  15. 15. A method of making a fiber comprising the steps of: And heating, melting and extruding the composition of the polyester and the polyamide into a spinning box body through a screw extruder, extruding the composition into a spinning assembly through a melt metering pump, forming a primary yarn through a spinneret plate, cooling, oiling, pre-networking, hot roller drafting and heat setting the primary yarn, and winding and forming through a main network and a winding machine to obtain a fiber product.
  16. 16. A facing material comprising the composition of any one of claims 1 to 12, or the fiber of any one of claims 13, 14, or the fiber product of claim 15.

Description

Polyester and polyamide composition, fiber, fabric and preparation method Technical Field The invention belongs to the technical field of blended yarns of polyester and polyamide. Background The Polyester (PET) fiber, namely polyester, has the greatest advantages of good crease resistance and shape retention, relatively high strength and elastic recovery capability, and is firm and durable, crease-resistant, wash-and-wear and non-sticky, and has been widely focused and applied due to the excellent properties. However, polyester fibers lack hydrophilic genes, so that the polyester fabric has poor moisture absorption and dyeing properties, high dyeing requirements (dyeing is performed under high temperature and high pressure) and low color fastness. Early polyester has improved moisture absorption and moisture conductivity by preparing profiled fibers and filling grooves on the surfaces of the profiled fibers, but has limited moisture absorption capacity due to lack of hydrophilic groups. The polyamide 56 (PA 56) has an odd carbon structure, and the fiber has the characteristics of excellent moisture absorption performance, softness, comfort, low-temperature dyeability and the like, so that the polyamide 56 has wide application prospect in high-grade comfort clothing. The polyester and the conventional polyamide are both crystalline polymers, the crystalline phase separation is easy to occur during blending, the mechanical properties of the blended fibers are generally poor, and meanwhile, the fuzzing and pilling resistance, elasticity, dyeing property, hygroscopicity and the like of the fibers are also to be improved. Disclosure of Invention In a first aspect, an embodiment of the present invention provides a polyester and polyamide composition comprising a polyester and a polyamide, said polyester comprising diethylene glycol and said polyamide comprising groups-NH 2 at the ends of several molecular chains, wherein: the mass of the diglycol accounts for n% of the total mass of the polyester and the polyamide, and n is less than or equal to 1.5; The content of-NH 2 in the polyamide is m mol/kg, and m is more than or equal to 10. In one embodiment, the intrinsic viscosity of the polyester is 0.4 to 0.9dL/g, and further 0.5 to 0.75dL/g. In one embodiment, the polyamide has a relative viscosity of 35 to 63, and further 45 to 60. The solvent for the relative viscosity test of the polyamide was 90% by weight formic acid. In the invention, the preparation raw materials of the bio-based polyamide can be all bio-based materials as polymerization monomers, or at least one bio-based material can be used as polymerization monomers and the rest materials derived from petroleum byproducts are polymerized. For example, one of the polymeric monomers of polyamide 56 is a bio-based pentanediamine. Bio-based pentylene diamine is produced by a bioconversion process using a bio-based feedstock, the pentylene diamine containing organic carbon of renewable origin meeting ASTM D6866 standard. In one embodiment, the polyamide is selected from polyamide 56. In one embodiment, the mass ratio of polyamide to polyester in the composition is (5-40): (60-95), and further (15-40): (60-85). Diethylene glycol (DEG) is a byproduct in polyester synthesis, and ether bonds contained in DEG are liable to undergo peroxidation during spinning. The studies of the present invention have found that the diethylene glycol content of the polyester and polyamide composition system affects the properties of the fiber product, and can be improved by using a polyamide with a high terminal amino group content if the diethylene glycol content in the composition is higher, and that the range of terminal amino groups content of the polyamide can be wider if the diethylene glycol content in the composition is controlled lower. According to the invention, fiber products with better comprehensive properties can be obtained by controlling the diethylene glycol content in the polyester and polyamide composition and combining with polyamide with certain amino-terminated content. In one embodiment, n is equal to or less than 1.15, further, n is equal to or less than 1.08, further, n is equal to or less than 1.0, further, n is equal to or less than 0.9, further, n is equal to or less than 0.75, further, n is equal to or less than 0.7. In one embodiment, n is greater than or equal to 0, and further, n is greater than or equal to 0.2. In one embodiment, m is greater than or equal to 30, further, m is greater than or equal to 60, further, m is greater than or equal to 80. In one embodiment, m is equal to or less than 200, and further, m is equal to or less than 150. The specific values of m and n can be arbitrarily combined to form a plurality of combination modes. In one embodiment, n is 0.75< 1.15, and m is 30. In one embodiment, n is less than or equal to 0.75, and m is more than or equal to 30. In one embodiment, n is less than or equal to 0.7, and m is more than or e