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CN-121976313-A - Combed sirospun raw material composition containing bio-based polyamide component

CN121976313ACN 121976313 ACN121976313 ACN 121976313ACN-121976313-A

Abstract

The invention relates to the technical field of high polymer compositions and discloses a combed sirospun raw material composition containing a bio-based polyamide component, which comprises a maleic anhydride grafted biomass thermoplastic polyurethane elastomer, polyamide 610/612 copolyamide and bio-based polyamide 56 resin, wherein the components are utilized to induce lubrication to migrate towards the opposite surfaces by means of rheological viscosity ratio mismatch under a molten state, and a microgel anchor point constructed by interface in-situ grafting reaction is matched with the microgel anchor point to form a hierarchical polarity gradient structure on the submicron surface layer of a product fiber.

Inventors

  • LU SIQING
  • ZENG JIE
  • CHEN TIANBAO

Assignees

  • 湖南科创纺织股份有限公司

Dates

Publication Date
20260505
Application Date
20260313

Claims (10)

  1. 1. A combed sirospun raw material composition comprising a biobased polyamide component, characterized in that the composition comprises the following components in parts by total weight, based on 100 parts by weight: 1.5 to 4.5 parts of maleic anhydride grafted biomass thermoplastic polyurethane elastomer, wherein the maleic anhydride grafted biomass thermoplastic polyurethane elastomer is obtained by performing in-situ grafting modification on maleic anhydride monomers after castor oil based polyol is polymerized by diisocyanate, and the grafting rate of the maleic anhydride is 0.8 to 1.5 percent; Polyamide 610/612 copolyamide 2.0 parts to 6.0 parts having a melting point lower than the biobased polyamide 56 resin by 30 ℃ to 50 ℃; 0.1 to 1.0 part of a processing aid, and the balance of a biobased polyamide 56 resin, the biobased polyamide 56 resin having a relative viscosity of 2.4 to 3.2; The apparent viscosity ratio of polyamide 610/612 copolyamide to biobased polyamide 56 resin is 0.6 to 0.8 at 240 ℃ to 270 ℃ and a shear rate of 100s -1 ; The composition is obtained by placing the components in a co-rotating twin-screw extruder, controlling the melting temperature to be 240-270 ℃ and the screw rotating speed to be 350-500 rpm, enabling maleic anhydride groups in the maleic anhydride grafted biomass thermoplastic polyurethane elastomer to perform in-situ grafting reaction with amino groups at the tail ends of the bio-based polyamide 56 resin, and constructing anchor points with steric hindrance effect in a matrix continuous phase formed by the bio-based polyamide 56 resin; The apparent viscosity ratio is utilized to induce the polyamide 610/612 copolyamide to migrate to the surface layer of the fiber, and a surface layer gradient structure formed by maleic anhydride grafted biomass thermoplastic polyurethane elastomer, polyamide 610/612 copolyamide molecular chains and bio-based polyamide 56 resin polar points is formed in a region of 15nm to 45nm below the surface layer of the product fiber through the physical entanglement action of anchor points.
  2. 2. A combed sirospun raw material composition comprising a biobased polyamide component according to claim 1, characterized in that the process further comprises a raw material pretreatment step of drying the biobased polyamide 56 resin in a vacuum at 105 ℃ for 12 hours to a water content of not more than 0.02wt%, the co-rotating twin screw extruder having an aspect ratio of 44 to 48, and in that the screw combination is provided with at least three sets of kneading block elements arranged in a staggered manner for generating a non-linear shear field in the melting zone to trigger an in situ grafting reaction and to maintain the dispersed phase particle size of the polyamide 610/612 copolyamide at a submicron scale.
  3. 3. The combed sirospun raw material composition comprising a biobased polyamide component of claim 1, wherein the maleic anhydride grafted biomass thermoplastic polyurethane elastomer has a shore hardness of 80A to 85A and the biobased polyamide 56 resin has a relative viscosity of 2.85.
  4. 4. A combed sirospun raw material composition comprising a biobased polyamide component according to claim 1, characterized in that the melt viscosity of the polyamide 610/612 copolyamide is 110 Pa-s to 130 Pa-s at 260 ℃ and a shear rate of 100s -1 .
  5. 5. Combed sirospun raw material composition containing bio-based polyamide component according to claim 1, characterized in that the polyamide 610/612 copolyamide is in parts by weight Weight portion of biomass thermoplastic polyurethane elastomer grafted with maleic anhydride The following relationship is satisfied: , wherein, Is the weight part of polyamide 610/612 copolyamide in the composition, The weight parts of the maleic anhydride grafted biomass thermoplastic polyurethane elastomer in the composition.
  6. 6. A combed sirospun raw material composition comprising a biobased polyamide component according to claim 1, characterized in that the processing aid comprises antioxidant 1010 and antioxidant 168 in a weight ratio of antioxidant 1010 to antioxidant 168 of 1:1 to 1:2.
  7. 7. A combed sirospun raw material composition comprising a biobased polyamide component according to claim 1, characterized in that in the in-situ grafting reaction, the melting zone temperature of the co-rotating twin screw extruder is set to 255 ℃ to 265 ℃ and the residence time of each component in the reaction zone is controlled to 25 seconds to 40 seconds.
  8. 8. Combed sirospun raw material composition comprising a biobased polyamide component according to claim 1, characterized in that the skin gradient structure appears as a continuous modulus transition layer by atomic force microscopy in modulus mapping mode, and the modulus value of the modulus transition layer is between the modulus value of the maleic anhydride grafted biomass thermoplastic polyurethane elastomer and the modulus value of the biobased polyamide 56 resin.
  9. 9. A combed sirospun feedstock composition comprising a biobased polyamide component according to claim 2, characterized in that the co-rotating twin screw extruder further comprises a vent zone located at the rear end of the melt zone, the temperature of the vent zone being set at 245 ℃ to 255 ℃.
  10. 10. The combed sirospun raw material composition containing a bio-based polyamide component according to claim 1, wherein the instantaneous break frequency of the fiber prepared by the composition is reduced by more than 55% compared with that of the bio-based polyamide 56 fiber without the surface gradient structure under the working condition of 120 combed sirospun.

Description

Combed sirospun raw material composition containing bio-based polyamide component Technical Field The invention relates to a combed sirospun raw material composition containing a bio-based polyamide component, belonging to the technical field of high polymer compositions. Background The current biobased polyamide 56 is used in high quality combed sirospun feedstock compositions, conventional modification by matrix addition of lubricating components or surface treatments to balance the process friction force field. A long carbon chain diamine structure is introduced into a bio-based polyamide molecular chain to generate a discontinuous polarity distribution phenomenon, in a high shear force field of a combed sirospun twisting triangle area, uneven polarity point distribution causes instant desorption of an interfacial physical film, interfacial balance generated by molecular structural characteristics is destroyed, a high-frequency pulse type stick-slip effect is generated, the use amount of a lubricating phase is increased to cause integral phase separation of a matrix, the melt strength of the composition is reduced, the mechanical support of spinning cannot be met, in order to make up a physical short plate, the mechanical property of the matrix is improved by toughening components in the prior art, for example, china patent with an authorized bulletin number of CN116102882B discloses a low-temperature high-toughness low-water-absorption bio-based PA56 alloy and a preparation method thereof. Therefore, how to eliminate the mutation of the biobased polyamide interface energy at the material body level through the rheological design and interface reconstruction among components becomes the technical problem to be solved by the invention. Disclosure of Invention In order to solve the problems in the background technology, the technical scheme of the invention is as follows, a combed sirospun raw material composition containing a biobased polyamide component comprises the following components in parts by weight based on 100 parts by weight: 1.5 to 4.5 parts of maleic anhydride grafted biomass thermoplastic polyurethane elastomer, wherein the maleic anhydride grafted biomass thermoplastic polyurethane elastomer is obtained by performing in-situ grafting modification on maleic anhydride monomers after castor oil based polyol is polymerized by diisocyanate, and the grafting rate of the maleic anhydride is 0.8 to 1.5 percent; Polyamide 610/612 copolyamide 2.0 parts to 6.0 parts having a melting point lower than the biobased polyamide 56 resin by 30 ℃ to 50 ℃; 0.1 to 1.0 part of a processing aid, and the balance of a biobased polyamide 56 resin, the biobased polyamide 56 resin having a relative viscosity of 2.4 to 3.2; The apparent viscosity ratio of polyamide 610/612 copolyamide to biobased polyamide 56 resin is 0.6 to 0.8 at 240 ℃ to 270 ℃ and a shear rate of 100s -1; The composition is obtained by placing the components in a co-rotating twin-screw extruder, controlling the melting temperature to be 240-270 ℃ and the screw rotating speed to be 350-500 rpm, enabling maleic anhydride groups in the maleic anhydride grafted biomass thermoplastic polyurethane elastomer to perform in-situ grafting reaction with amino groups at the tail ends of the bio-based polyamide 56 resin, and constructing anchor points with steric hindrance effect in a matrix continuous phase formed by the bio-based polyamide 56 resin; The apparent viscosity ratio is utilized to induce the polyamide 610/612 copolyamide to migrate to the surface layer of the fiber, and a surface layer gradient structure formed by maleic anhydride grafted biomass thermoplastic polyurethane elastomer, polyamide 610/612 copolyamide molecular chains and bio-based polyamide 56 resin polar points is formed in a region of 15nm to 45nm below the surface layer of the product fiber through the physical entanglement action of anchor points. Preferably, the process further comprises a raw material pretreatment step of drying the biobased polyamide 56 resin in a vacuum at 105 ℃ for 12 hours to ensure that the water content is not higher than 0.02wt%, wherein the length-diameter ratio of the homodromous double screw extruder is 44 to 48, and at least three groups of kneading block elements which are arranged in a staggered manner are arranged in the screw combination and are used for generating a nonlinear shearing field in a melting zone so as to trigger an in-situ grafting reaction and maintain the disperse phase particle size of the polyamide 610/612 copolyamide to be in a submicron scale. Preferably, the maleic anhydride grafted biomass thermoplastic polyurethane elastomer has a Shore hardness of 80A to 85A and the bio-based polyamide 56 resin has a relative viscosity of 2.85. Preferably, the polyamide 610/612 copolyamide has a melt viscosity of 110 Pa.s to 130 Pa.s at 260℃and a shear rate of 100s -1. Preferably, the polyamide 610/612 copolyamide is present in parts by weig