Search

CN-122013353-A - Polyester industrial yarn for geogrid and preparation method thereof

CN122013353ACN 122013353 ACN122013353 ACN 122013353ACN-122013353-A

Abstract

The invention relates to the technical field of high-performance polyester, and discloses a polyester industrial yarn for geogrid and a preparation method thereof, wherein the preparation method of the polyester industrial yarn for geogrid comprises the following steps of reacting cyanuric chloride with m-phenylenediamine to obtain an intermediate product; the intermediate product is reacted with 4-hydroxyphthalic anhydride to obtain an imide compound, terephthalic acid, ethylene glycol, 1, 6-hexanediol and a modifier are polymerized, discharged and granulated to obtain high-performance PET copolyester master batches, the high-performance PET copolyester master batches, polyester chips and composite modified graphene oxide are mixed and melt-spun to obtain the polyester industrial yarn for the geogrid, and the polyester industrial yarn for the geogrid has the characteristics of high strength and high temperature resistance, has good corrosion resistance, and can be used in the warp-knitted polyester geogrid to improve the working performance of the warp-knitted polyester geogrid and prolong the service life of the warp-knitted polyester geogrid.

Inventors

  • TAN HONGLEI
  • Pang Taixin
  • TAN HONGSHAN
  • LI JIANGWEI

Assignees

  • 山东阳光新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260330

Claims (10)

  1. 1. The preparation method of the terylene industrial yarn for the geogrid is characterized by comprising the following steps of: reacting cyanuric chloride with m-phenylenediamine to obtain an intermediate product, and reacting the intermediate product with 4-hydroxyphthalic anhydride to obtain an imide compound; Step two, polymerizing terephthalic acid, ethylene glycol, 1, 6-hexanediol and a modifier, discharging, granulating and obtaining high-performance PET copolyester master batch, wherein the modifier is obtained by reacting a fluorine-containing compound with an imide group compound, and the fluorine-containing compound is obtained by reacting 2,3, 4-hexafluoro-1, 5-pentanediol with hexamethylene diisocyanate; And thirdly, mixing the high-performance PET copolyester master batch, the polyester chips and the composite modified graphene oxide, and carrying out melt spinning to obtain the polyester industrial yarn for the geogrid.
  2. 2. The method for producing a polyester industrial yarn for geogrid according to claim 1, wherein in the first step, the method for producing an imido compound comprises: Adding cyanuric chloride into tetrahydrofuran in a nitrogen atmosphere, cooling to 0 ℃, dropwise adding 7.6wt% of m-phenylenediamine/tetrahydrofuran solution under stirring, then adding sodium bicarbonate, heating to 50-60 ℃, stirring for 4-6 hours, and purifying to obtain an intermediate product, wherein the mass ratio of cyanuric chloride, tetrahydrofuran, 7.6wt% of m-phenylenediamine/tetrahydrofuran solution and sodium bicarbonate is (6-12): 120-150): (46.3-92.6): (8.2-16.4); And adding the intermediate product into N, N-dimethylformamide, stirring, adding 4-hydroxyphthalic anhydride, reacting for 2-4 hours at 120-130 ℃ and purifying to obtain the imide compound, wherein the mass ratio of the intermediate product to the N, N-dimethylformamide to the 4-hydroxyphthalic anhydride is (4-6.4) (100-150) (4.9-7.9).
  3. 3. The method for preparing polyester industrial yarn for geogrid according to claim 1, wherein in the second step, the method for preparing high-performance PET copolyester master batch comprises the following steps: In nitrogen atmosphere, mixing terephthalic acid, ethylene glycol, 1, 6-hexanediol, tetrabutyl titanate and a modifier, reacting for 2-3 hours at 230-240 ℃ and 0.25-0.3MPa, reducing pressure, then heating to 270-280 ℃, reacting for 20-40min, keeping the temperature unchanged, adjusting the pressure to 160-180Pa, continuing to react for 2-3 hours, discharging, solidifying and granulating to obtain the high-performance PET copolyester master batch.
  4. 4. The method for preparing the terylene industrial yarn for the geogrid according to claim 3, wherein the mol ratio of terephthalic acid to ethylene glycol to 1, 6-hexanediol to modifier is (1.68-1.74): 2 (7-7.5): 0.5-1), and the dosage of tetrabutyl titanate is 0.8-1.2wt% of the dosage of terephthalic acid.
  5. 5. The method for producing polyester industrial yarn for geogrid according to claim 1, wherein in the second step, the modifier is produced by: Adding 2,3, 4-hexafluoro-1, 5-pentanediol and dibutyltin dilaurate into tetrahydrofuran in nitrogen atmosphere, then adding hexamethylene diisocyanate, heating to 57-63 ℃, stirring and reacting for 3-5h, and purifying to obtain fluorine-containing compounds; wherein the mass ratio of the 2,3, 4-hexafluoro-1, 5-pentanediol, the dibutyl tin dilaurate, the tetrahydrofuran and the hexamethylene diisocyanate is (4.2-8.4): (0.01-0.03): (100-150): (7-15); And (3) adding the fluorine-containing compound, the imide compound and the dibutyl tin dilaurate into N, N-dimethylformamide in a nitrogen atmosphere, stirring at 70-80 ℃ for reacting for 2-4 hours, and purifying to obtain the modifier, wherein the mass ratio of the fluorine-containing compound to the imide compound to the dibutyl tin dilaurate to the N, N-dimethylformamide is (8.2-16.4): 4.2-8.4): (0.02-0.04): 100-200.
  6. 6. The method for preparing the polyester industrial yarn for the geogrid according to claim 1, wherein in the third step, the mass ratio of the high-performance PET copolyester master batch to the polyester chips to the composite modified graphene oxide is (20-40): 100 (5-15).
  7. 7. The method for producing a polyester industrial yarn for geogrid according to claim 1, wherein in the third step, the melt spinning condition is that the spinning speed is 600m/min and the melting temperature is 282-291 ℃.
  8. 8. The method for preparing polyester industrial yarn for geogrid according to claim 1, wherein in the third step, the composite modified graphene oxide is prepared by the following method: Step S1, mixing acyl carborane chloride and tetrahydrofuran according to the mass ratio of (2.5-3.5) to (40-60), stirring to obtain a mixed solution A, mixing graphene oxide and tetrahydrofuran according to the mass ratio of (3-5) to (300-400), carrying out ultrasonic treatment, adding the mixed solution A at the temperature of 0 ℃, stirring for 1.5-2.5h, then stirring for 3.5-4.5h at the temperature of 23-25 ℃, and purifying to obtain the surface modified graphene oxide; S2, mixing dimethyl terephthalate, ethylene glycol and zinc acetate, reacting for 1.5-2.5 hours at 188-192 ℃, then adding antimony trioxide and triphenyl phosphate, continuously stirring for 50-70 minutes, then adding surface modified graphene oxide, heating to 226-234 ℃ and maintaining for 100-150 minutes, and purifying to obtain the composite modified graphene oxide, wherein the mass ratio of dimethyl terephthalate, ethylene glycol, zinc acetate, antimony trioxide, triphenyl phosphate and surface modified graphene oxide is (11.2-33.6): (7.8-23.4): (0.02-0.04): (0.01-0.03): (0.03-0.07): (0.1-0.5).
  9. 9. The method for producing polyester industrial yarn for geogrid according to claim 8, wherein the method for producing carborane chloride comprises the steps of: Dissolving m-carborane in tetrahydrofuran, stirring, adding 2.4mol/L n-hexane solution of n-butyllithium at 0 ℃, stirring, introducing carbon dioxide gas for 50-70min, quenching with 1mol/L hydrochloric acid aqueous solution, and purifying to obtain carboxylated carborane, wherein the mass ratio of the n-hexane solution of m-carborane, tetrahydrofuran and 2.4mol/L n-butyllithium is (4.4-6.6): (100-120): (22.8-34.2); Mixing carboxylated carborane, phosphorus pentachloride and phosphorus oxychloride in the mass ratio of (2.2-4.4): (16.8-33.6): (3.3-6.6), stirring for 100-150min at 88-92 ℃, then, maintaining the temperature unchanged, introducing chlorine for 50-70min, and purifying to obtain the acyl carborane chloride.
  10. 10. A polyester industrial yarn for geogrid prepared by the method for preparing the polyester industrial yarn for geogrid according to any one of claims 1 to 9.

Description

Polyester industrial yarn for geogrid and preparation method thereof Technical Field The invention relates to the technical field of high-performance polyester, in particular to a polyester industrial yarn for geogrid and a preparation method thereof. Background With the continuous development of social economy, the construction of the foundation facilities is more and more emphasized in China, the problems of lack of land resources, insufficient engineering conditions and the like are brought to the construction, the problems can be improved to a great extent when the geosynthetic material is applied to the engineering, the geogrid has the characteristics of high tensile strength, low elongation, good tear resistance, good durability and the like, is often applied to reinforcing soft soil foundations, reinforcing dykes and reinforcement, can improve the stability of a substrate, improve the bearing capacity and further reduce uneven settlement, can also be used in reinforced engineering of roadbed side slopes, so as to improve the stability of the slope, and can improve the strength and the integrity of the abutment when being applied to the reinforced abutment, so as to prevent the phenomenon of bridge head jumping, and therefore, the application scale of the geogrid in the engineering is continuously expanded. The warp-knitted polyester geogrid is a relatively new geotechnical material, is a geogrid which is made by taking polyester industrial filaments as raw materials, firstly weaving grid grey cloth through a warp-weft directional weaving technology and then coating the grid grey cloth through a coating material, and has the characteristics of high strength and corrosion resistance in order to meet the production requirement of the warp-knitted polyester geogrid and the use requirement in various complex environments. Disclosure of Invention In order to solve the technical problems, the invention provides a preparation method of terylene industrial yarns for geogrid, which comprises the following steps: reacting cyanuric chloride with m-phenylenediamine to obtain an intermediate product, and reacting the intermediate product with 4-hydroxyphthalic anhydride to obtain an imide compound; Step two, polymerizing terephthalic acid, ethylene glycol, 1, 6-hexanediol and a modifier, discharging, granulating and obtaining high-performance PET copolyester master batch, wherein the modifier is obtained by reacting a fluorine-containing compound with an imide group compound, and the fluorine-containing compound is obtained by reacting 2,3, 4-hexafluoro-1, 5-pentanediol with hexamethylene diisocyanate; And thirdly, mixing the high-performance PET copolyester master batch, the polyester chips and the composite modified graphene oxide, and carrying out melt spinning to obtain the polyester industrial yarn for the geogrid. Preferably, in the first step, the preparation method of the imido compound comprises: Adding cyanuric chloride into tetrahydrofuran in a nitrogen atmosphere, cooling to 0 ℃, dropwise adding 7.6wt% of m-phenylenediamine/tetrahydrofuran solution under stirring, then adding sodium bicarbonate, heating to 50-60 ℃, stirring for 4-6 hours, and purifying to obtain an intermediate product, wherein the mass ratio of cyanuric chloride, tetrahydrofuran, 7.6wt% of m-phenylenediamine/tetrahydrofuran solution and sodium bicarbonate is (6-12): 120-150): (46.3-92.6): (8.2-16.4); adding the intermediate product into N, N-dimethylformamide in a nitrogen atmosphere, stirring, then adding 4-hydroxyphthalic anhydride, and reacting for 2-4 hours at 120-130 ℃ and purifying to obtain an imide compound, wherein the mass ratio of the intermediate product to the N, N-dimethylformamide to the 4-hydroxyphthalic anhydride is (4-6.4): (100-150): (4.9-7.9); In the process, three chlorine atoms in cyanuric chloride react with amino at one end of m-phenylenediamine to obtain an intermediate product, the intermediate product contains a plurality of benzene ring structures and triazine rings, the intermediate product has good mechanical properties and thermal stability, and then the amino of the intermediate product reacts with 4-hydroxyphthalic anhydride to generate an imide compound containing an imide ring structure, wherein the imide ring structure has good mechanical properties, corrosion resistance, hydrophobicity and thermal stability. Preferably, in the second step, the preparation method of the high-performance PET copolyester masterbatch comprises the following steps: In nitrogen atmosphere, mixing terephthalic acid, ethylene glycol, 1, 6-hexanediol, tetrabutyl titanate and a modifier, reacting for 2-3 hours at 230-240 ℃ and 0.25-0.3MPa, reducing pressure, then heating to 270-280 ℃, reacting for 20-40min, keeping the temperature unchanged, adjusting the pressure to 160-180Pa, continuing to react for 2-3 hours, discharging, solidifying and granulating to obtain high-performance PET copolyester master batch; In the process,