A method for preparing a polyurethane-based fluorine-free anti-wicking polyester industrial yarn

Abstract

This application provides a method for preparing polyurethane-based fluorine-free antiwicking polyester industrial yarn, belonging to the field of polyester fiber technology. A diacid reacts with a diisocyanate to obtain a reactive monomer. The obtained reactive monomer reacts with a polysiloxane monomer and an aliphatic diol to obtain an organosilicon-modified polyol. This organosilicon-modified polyol reacts with the diisocyanate to obtain an antiwicking oil-absorbing agent. The obtained antiwicking oil-absorbing agent is used in the oiling process of the antiwicking polyester industrial yarn, imparting antiwicking durability to the polyester industrial yarn and making it suitable for various application scenarios.

Description

Technical Field

[0001] This application relates to a method for preparing polyurethane-based fluorine-free antiwicking polyester industrial yarn, belonging to the field of polyester fiber technology. Background Technology

[0002] Polyester industrial yarn is widely used in industrial textiles, transportation, and engineering construction materials due to its high strength, high modulus, excellent thermal stability, and weather resistance. However, polyester fiber itself has a certain degree of hydrophilicity and a significant wicking effect, causing finished products to easily absorb water and increase in weight in humid environments, affecting their performance and service life. Therefore, anti-wicking modification is an important optimization direction for polyester industrial yarn. Traditional anti-wicking treatments mainly rely on fluorinated oils (such as C8 and C6 types), but fluorinated oils release persistent organic pollutants such as perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) during production and use. These pollutants are bioaccumulative and toxic, seriously endangering human health and the ecological environment, and have been restricted or banned in many countries. Among existing fluorine-free anti-wicking technologies, acrylic oils have problems such as poor abrasion resistance and insufficient waterproof durability, while ordinary polyurethane oils still have relatively high surface energy, making their anti-wicking effect difficult to match that of fluorinated products.

[0003] To date, research on polyurethane-based fluorine-free waterproofing agents is limited. In the preparation process of the anti-wicking waterproof fiber in patent CN111877003A, perfluorooctanoic acid (PFOA) is used as the main component of the anti-wicking agent in the first oiling stage, while ordinary oil is used in the second oiling stage. This fails to ensure that the spinning oil adheres evenly and fully to the fiber surface, resulting in poor waterproofing performance. Patent CN119800529A uses polyurethane-based materials as the anti-wicking agent, but its surface energy is still relatively high, leaving room for improvement in anti-wicking performance.

[0004] Among known materials, organosilicon possesses strong hydrophobic properties and can be used to improve the antiwicking properties of polyurethane oils. However, current research mostly involves physically mixing organosilicon with a polymer matrix to enhance the hydrophobicity of the material, which suffers from problems such as easy migration of silicon-containing components and poor hydrophobic persistence of the composite component. Furthermore, since silicon-containing monomers often lack reactive groups, it is difficult to incorporate silicon-containing components into polymer chains through copolymerization, and there are currently no reports on the preparation of polyurethane-type antiwicking oils using copolymerization. Summary of the Invention

[0005] In view of this, this application first provides a method for preparing a polyurethane-based anti-wicking oil absorbent.

[0006] Specifically, this application is implemented through the following scheme: A method for preparing a polyurethane-based anti-oil absorbent, comprising the following steps: Step 1: Using a diacid and a diisocyanate as raw materials, a reactive monomer is obtained by solution reaction. The diacid is at least one of 2,2-di(hydroxymethyl)propionic acid (DMPA) and 2,3-dihydroxysuccinic acid, and the diisocyanate is at least one of 2,4-toluene diisocyanate, naphthalene diisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate. Step 2: Using polysiloxane monomers, aliphatic diols, and the reactive monomers prepared in Step 1 as raw materials, an organosilicon-modified polyol is obtained by solution reaction. The polysiloxane monomers are at least one of terminal aminopropyl polysiloxane, terminal hydroxypropyl polysiloxane, and terminal hydroxypropyl diethyl polysiloxane, and the aliphatic diols are at least one of ethylene glycol, 1,4-butanediol, and hexanediol. Step 3: Using diisocyanate and the organosilicon-modified polyol prepared in Step 2 as raw materials, an anti-core oil absorbent is prepared by polymerization reaction or polymerization-chain extension reaction, combined with a dispersant or chain extender. The diisocyanate is at least one of aromatic diisocyanate and aliphatic diisocyanate.

[0007] In step one, The molar ratio of the dicarboxylic acid to the diisocyanate is 1:1.5 to 2.5.

[0008] The reaction temperature is 40 ~ 60 ℃.

[0009] The reaction lasts for 2.5 to 4.0 hours.

[0010] In step two, The amount of aliphatic diol added is 85-98% of the total molar amount of the reactive monomer, polysiloxane monomer, and aliphatic diol.

[0011] The molar ratio of the reactive monomer to the polysiloxane monomer is 1:0.8 ~ 1.3.

[0012] The reaction temperature is 40 ~ 60 ℃.

[0013] The reaction lasts for 3.4 to 4.5 hours.

[0014] In step three, The anti-core absorbent is either a reactive anti-core absorbent or a non-reactive anti-core absorbent.

[0015] When the oil-absorbing agent is a reactive anti-wicking oil absorbent, its preparation process is as follows: A silicone-modified polyol reacts with a diisocyanate to generate a polyurethane prepolymer with a molecular weight of 2000-4000 g / mol. Then, a diol-based chain extender or a diamine-based chain extender is added, and the mixture is stirred until homogeneous, continuing the reaction to obtain the reactive anti-wicking oil absorbent. More preferably, the amount of the diol-based chain extender or diamine-based chain extender added is 7-12% of the mass of the polyurethane prepolymer.

[0016] When the oiling agent is a non-reactive anti-wicking oil absorbent, its preparation process is as follows: an organosilicon-modified polyol reacts with a diisocyanate to generate a polyurethane polymer with a molecular weight of 8000-15000 g / mol; then ethyl acetate or N,N-dimethylformamide is added as a dispersant, and the mixture is ultrasonically dispersed to obtain the non-reactive anti-wicking oil absorbent. More preferably, the amount of dispersant added is 5-10% of the mass of the polyurethane polymer.

[0017] The aforementioned polyurethane-based anti-wicking oil absorbent can be directly applied to the oiling process of polyester industrial yarn to prepare anti-wicking polyester industrial yarn.

[0018] In the application process: after the polyester chips are melt-spun, they sequentially undergo initial oiling, multi-stage stretching and heat setting, second oiling, dynamic curing, and winding to obtain anti-wicking polyester industrial yarn. The second oiling uses a polyurethane-based anti-wicking oil-absorbing agent. More preferably, the first oiling uses a conventional oiling agent. The dynamic curing refers to the dynamic curing of the yarn bundle by five pairs of contact heating rollers after the second oiling. The winding speed is 3800 ~ 4500 m / min. The anti-wicking polyester industrial yarn obtained by the above method has a wicking height ≤ 7.5 cm, a breaking strength ≥ 7.0 cN / dtex, a strength retention rate ≥ 90% after friction, and is free of fluorinated toxic and harmful substances such as PFOA and PFOS.

[0019] Compared with the prior art, the beneficial effects of this application are summarized as follows: 1) Starting from the synthetic monomers of polyurethane, this application first prepares a silicone-containing polyol, namely an organosilicon-modified polyol, and then polymerizes it to obtain a polyurethane-based antiwicking oil absorbent. The organosilicon component endows the fiber with low surface energy, and the antiwicking effect is comparable to that of fluorinated products. Under the synergy of the polyurethane structure, organosilicon and the preparation process of the antiwicking oil absorbent, the obtained antiwicking oil absorbent has both the low surface energy of organosilicon and the excellent adhesion and mechanical resistance of polyurethane. While ensuring the durability of use, it also significantly improves the abrasion resistance, thereby giving the antiwicking object, such as antiwicking polyester industrial yarn, good antiwicking performance.

[0020] 2) The oiling agent obtained in this application can be directly applied to the oiling process of polyester industrial yarn, and completely eliminates the use of fluorinated oiling agents. It can achieve the ideal anti-wicking effect when combined with conventional chemical reagents. There is no need to modify the existing melt spinning equipment. It has strong process compatibility and low industrialization cost. It can be widely used in industrial textiles, transportation and other fields. The product and preparation process have the advantages of being non-toxic and environmentally friendly.

[0021] 3) By adjusting the final molding process of the anti-core oil absorbent, two oil agent solutions, reactive and non-reactive, can be obtained to meet the needs of different production processes and equipment conditions, thereby adapting to more application scenarios and making significant innovations in the development of new polyester industrial yarn oil agents. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the technical solutions of this application will be further described in detail below with reference to specific examples in the embodiments of this application. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit the technical solutions of this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Example 1

[0024] This embodiment provides a reactive polyurethane-based anti-oil absorbent, the preparation process of which is as follows: 1) Preparation of reactive monomers: 2,2-dimethylolpropionic acid and 2,4-toluene diisocyanate were weighed in a molar ratio of 1:1.5 and reacted at 40 °C for 2.5 h using a solution method to obtain reactive monomers.

[0025] 2) Preparation of organosilicon-modified polyol: The reactive monomer, ethylene glycol, and terminal aminopropyl polysiloxane were weighed and mixed according to a molar ratio of 1:0.8:1, and reacted in solution at 40 °C for 3.4 h; wherein the content of ethylene glycol in the hydroxylamine reactants was 85%, and organosilicon-modified polyol was obtained.

[0026] 3) Preparation of anti-core oil absorbent: Weigh the above-mentioned organosilicon-modified polyol and 2,4-toluene diisocyanate, and carry out polymerization-chain extension reaction to obtain a polyurethane prepolymer with a molecular weight of 2000 g / mol; weigh 7% of the mass of polyurethane prepolymer and add it as a chain extender, and stir evenly to obtain a reactive polyurethane-based anti-core oil absorbent.

[0027] The reactive polyurethane-based anti-wicking and oil-absorbing agent prepared by the above method is applied to the preparation of anti-wicking polyester industrial yarn: High-viscosity polyester chips with an intrinsic viscosity of 1.1 dL / g were weighed, dried, and melt-spun. After the first conventional oiling (using a special spinning oiling agent for polyester industrial yarn with an oiling rate of 1.0%) and multi-stage drawing and setting (total draw ratio of 4.0 times), a second oiling was performed using the aforementioned reactive anti-core oil-absorbing agent with an oiling rate of 0.5%. The yarn was then dynamically cured by five pairs of contact heating rollers and finally wound at a speed of 3800 m / min to obtain the finished polyester industrial yarn.

[0028] Tests showed that the wicking height of the fluorine-free antiwicking polyester industrial yarn prepared in this embodiment was 4.2 cm, and the breaking strength was 8.0 cN / dtex. After friction testing according to the FZ / T 50008-2014 standard "Test Methods for Polyester Industrial Yarn", the strength retention rate of the polyester industrial yarn was 94%.

[0029] Example 2

[0030] This embodiment provides a non-reactive polyurethane-based anti-wicking oil absorbent, the preparation process of which is as follows: 1) Preparation of reactive monomers: 2,3-dihydroxysuccinic acid and naphthalene diisocyanate (NDI) were weighed in a molar ratio of 1:2 and reacted in solution at 50 °C for 3 h to obtain reactive monomers.

[0031] 2) Preparation of organosilicon-modified polyol: The reactive monomer, 1,4-butanediol and hydroxypropyl-terminated polysiloxane were weighed and mixed in a molar ratio of 1:1:1 and reacted in solution at 50°C for 3.7 h; wherein the content of 1,4-butanediol in the hydroxyamino reactants was 90%, and organosilicon-modified polyol was obtained.

[0032] 3) Preparation of anti-core oil absorbent: Weigh the above-mentioned organosilicon modified polyol and naphthalene diisocyanate (NDI) and polymerize them to generate a polyurethane polymer with a molecular weight of 8000 g / mol; weigh 5% of the mass of the polyurethane polymer and add ethyl acetate dispersant to it, and ultrasonically disperse to obtain a non-reactive anti-core oil absorbent.

[0033] The reactive polyurethane-based anti-wicking and oil-absorbing agent prepared by the above method is applied to the preparation of anti-wicking polyester industrial yarn: High-viscosity polyester chips with an intrinsic viscosity of 1.1 dL / g were weighed, dried, and melt-spun. After the first conventional oiling (using a special spinning oiling agent for polyester industrial yarn with an oiling rate of 1.0%) and multi-stage drawing and setting (total draw ratio of 4.0 times), a second oiling was performed using the aforementioned reactive anti-core oil-absorbing agent with an oiling rate of 0.5%. The yarn was then dynamically cured by five pairs of contact heating rollers and finally wound at a speed of 4000 m / min to obtain the finished polyester industrial yarn.

[0034] Tests showed that the wicking height of the fluorine-free antiwicking polyester industrial yarn prepared in this embodiment was 4.9 cm, and the breaking strength was 8.3 cN / dtex. After friction testing according to the FZ / T 50008-2014 standard "Test Methods for Polyester Industrial Yarn", the strength retention rate of the polyester industrial yarn was 96%.

[0035] Example 3

[0036] This embodiment provides a reactive polyurethane-based anti-oil absorbent, the preparation process of which is as follows: 1) Preparation of reactive monomers: 2,2-dimethylolpropionic acid and diphenylmethane diisocyanate (MDI) were weighed at a molar ratio of 1:2.5 and reacted in solution at 60 °C for 4 h to prepare reactive monomers.

[0037] 2) Preparation of organosilicon-modified polyol: The reactive monomer, hexanediol, and hydroxypropyl diethyl polysiloxane were weighed and mixed according to a molar ratio of 1:1.3:1, and reacted in solution at 60 °C for 4.5 h; wherein the content of hexanediol in the hydroxyamino reactants was 98%, and organosilicon-modified polyol was obtained.

[0038] 3) Preparation of anti-core oil absorbent: Weigh the above-mentioned organosilicon modified polyol and diphenylmethane diisocyanate (MDI) and react to obtain a prepolymer with a molecular weight of 4000 g / mol; weigh 12% of the prepolymer mass of diamine chain extender and add it to it, and stir to obtain a reactive anti-core oil absorbent.

[0039] The reactive polyurethane-based anti-wicking and oil-absorbing agent prepared by the above method is applied to the preparation of anti-wicking polyester industrial yarn: High-viscosity polyester chips with an intrinsic viscosity of 1.1 dL / g were weighed, dried, and melt-spun. After the first conventional oiling (using a special spinning oiling agent for polyester industrial yarn with an oiling rate of 1.0%) and multi-stage drawing and setting (total draw ratio of 4.0 times), a second oiling was performed using the aforementioned reactive anti-core oil-absorbing agent with an oiling rate of 0.5%. The yarn was then dynamically cured by five pairs of contact heating rollers and finally wound at a speed of 4500 m / min to obtain the finished polyester industrial yarn.

[0040] Tests showed that the wicking height of the fluorine-free antiwicking polyester industrial yarn prepared in this embodiment was 3.8 cm, and the breaking strength was 8.5 cN / dtex. After friction testing according to the FZ / T 50008-2014 standard "Test Methods for Polyester Industrial Yarn", the strength retention rate of the polyester industrial yarn was 97%.

[0041] Example 4

[0042] This embodiment provides a non-reactive polyurethane-based anti-wicking oil absorbent, the preparation process of which is as follows: 1) Preparation of reactive monomers: 2,3-dihydroxysuccinic acid and isophorone diisocyanate (IPDI) were weighed at a molar ratio of 1:1.6 and reacted in solution at 45 °C for 2.8 h to obtain reactive monomers.

[0043] 2) Preparation of organosilicon-modified polyol: The reactive monomer, ethylene glycol, and terminal aminopropyl polysiloxane were weighed and mixed according to a molar ratio of 1:0.9:1, and reacted in solution at 45 °C for 3.5 h; wherein the content of ethylene glycol in the hydroxylamine reactants was 88%, and organosilicon-modified polyol was obtained.

[0044] 3) Preparation of anti-core oil absorbent: Weigh the above-mentioned organosilicon modified polyol and isophorone diisocyanate (IPDI) and polymerize to generate a polyurethane polymer with a molecular weight of 10000 g / mol; weigh 7% of N,N-dimethylformamide dispersant by mass of the polymer and add it to it, and ultrasonically disperse to obtain a non-reactive oil absorbent.

[0045] The reactive polyurethane-based anti-wicking and oil-absorbing agent prepared by the above method is applied to the preparation of anti-wicking polyester industrial yarn: High-viscosity polyester chips with an intrinsic viscosity of 1.1 dL / g were weighed, dried, and melt-spun. After the first conventional oiling (using a special spinning oiling agent for polyester industrial yarn with an oiling rate of 1.0%) and multi-stage drawing and setting (total draw ratio of 4.0 times), a second oiling was performed using the aforementioned reactive anti-core oil-absorbing agent with an oiling rate of 0.5%. The yarn was then dynamically cured by five pairs of contact heating rollers and finally wound at a speed of 4200 m / min to obtain the finished polyester industrial yarn.

[0046] Tests showed that the wicking height of the fluorine-free antiwicking polyester industrial yarn prepared in this embodiment was 5.8 cm, and the breaking strength was 7.8 cN / dtex. After friction testing according to the FZ / T 50008-2014 standard "Test Methods for Polyester Industrial Yarn", the strength retention rate of the polyester industrial yarn was 92%.

[0047] Example 5

[0048] This embodiment provides a reactive polyurethane-based anti-oil absorbent, the preparation process of which is as follows: 1) Preparation of reactive monomers: 2,2-dimethylolpropionic acid and naphthalene diisocyanate (NDI) were weighed at a molar ratio of 1:1.8 and reacted in solution at 55 °C for 3.5 h to prepare reactive monomers.

[0049] 2) Preparation of organosilicon-modified polyol: The reactive monomer, 1,4-butanediol and hydroxypropyl-terminated polysiloxane were weighed and mixed according to a molar ratio of 1:1.1:1 and reacted in solution at 55 °C for 4.0 h; wherein the content of 1,4-butanediol in the hydroxyamino reactants was 95%, and organosilicon-modified polyol was obtained.

[0050] 3) Preparation of anti-core oil absorbent: Weigh the above-mentioned organosilicon modified polyol and naphthalene diisocyanate (NDI) and react to obtain a prepolymer with a molecular weight of 3000 g / mol; weigh 9% of the mass of the prepolymer and add ethylene glycol chain extender to it, and stir to obtain a reactive oil agent.

[0051] The reactive polyurethane-based anti-wicking and oil-absorbing agent prepared by the above method is applied to the preparation of anti-wicking polyester industrial yarn: High-viscosity polyester chips with an intrinsic viscosity of 1.1 dL / g were weighed, dried, and melt-spun. After the first conventional oiling (using a special spinning oiling agent for polyester industrial yarn with an oiling rate of 1.0%) and multi-stage drawing and setting (total draw ratio of 4.0 times), a second oiling was performed using the aforementioned reactive anti-core oil-absorbing agent with an oiling rate of 0.5%. The yarn was then dynamically cured by five pairs of contact heating rollers and finally wound at a speed of 4200 m / min to obtain the finished polyester industrial yarn.

[0052] Tests showed that the wicking height of the fluorine-free antiwicking polyester industrial yarn prepared in this embodiment was 3.0 cm, and the breaking strength was 8.4 cN / dtex. After friction testing according to the FZ / T 50008-2014 standard "Test Methods for Polyester Industrial Yarn", the strength retention rate of the polyester industrial yarn was 96%.

[0053] Example 6

[0054] This embodiment provides a non-reactive polyurethane-based anti-wicking oil absorbent, the preparation process of which is as follows: 1) Preparation of reactive monomers: 2,3-dihydroxysuccinic acid and diphenylmethane diisocyanate (MDI) were weighed at a molar ratio of 1:1.7 and reacted in solution at 42 °C for 2.6 h to obtain reactive monomers.

[0055] 2) Preparation of organosilicon-modified polyol: The reactive monomer, hexanediol, and hydroxypropyl diethyl polysiloxane were weighed and mixed according to a molar ratio of 1:1.2:1 and reacted in solution at 42 °C for 3.6 h; wherein the content of hexanediol in the hydroxyamino reactants was 92%, and organosilicon-modified polyol was obtained.

[0056] 3) Preparation of anti-core oil absorbent: Weigh the above-mentioned organosilicon modified polyol and diphenylmethane diisocyanate (MDI), and polymerize to generate a polyurethane polymer with a molecular weight of 15000 g / mol; weigh 10% of the polymer mass of ethyl acetate dispersant and add it to it, and ultrasonically disperse to obtain a non-reactive oil agent.

[0057] The reactive polyurethane-based anti-wicking and oil-absorbing agent prepared by the above method is applied to the preparation of anti-wicking polyester industrial yarn: High-viscosity polyester chips with an intrinsic viscosity of 1.1 dL / g were weighed, dried, and melt-spun. After the first conventional oiling (using a special spinning oiling agent for polyester industrial yarn with an oiling rate of 1.0%) and multi-stage drawing and setting (total draw ratio of 4.0 times), a second oiling was performed using the aforementioned reactive anti-core oil-absorbing agent with an oiling rate of 0.5%. After dynamic curing by five pairs of contact heating rollers, the finished polyester industrial yarn was finally wound at a speed of 4300 m / min to obtain the finished polyester industrial yarn.

[0058] Tests showed that the wicking height of the fluorine-free antiwicking polyester industrial yarn prepared in this embodiment was 5.2 cm, and the breaking strength was 8.0 cN / dtex. After friction testing according to the FZ / T 50008-2014 standard "Test Methods for Polyester Industrial Yarn", the strength retention rate of the polyester industrial yarn was 95%.

[0059] Comparative Example 1

[0060] Using CN119800529A as Comparative Example 1, a hydrophobic oiling agent was formulated based on polyurethane polymers or polyurethane prepolymers. Polyester chips were fed into a screw extruder for melt extrusion, and then flowed out through a spinning assembly. After the first oiling, stretching, and heat setting, a second oiling was performed with the hydrophobic oiling agent. The filament bundle after the second oiling was dynamically heated by multi-rollers to complete fiber setting and oil film curing. The finished product, fluorine-free anti-wicking polyester industrial yarn, was obtained with a wicking height of 3.1~6.3 cm and a strength retention rate of 90~96%.

[0061] Compared with Comparative Example 1, the oil agent of this application, after being modified with organosilicon, has better compatibility with fibers, the oil film is not easy to fall off, and the anti-wicking durability is strong. At the same time, the product has a lower wicking height and a more stable strength retention rate. The product has better overall performance in terms of anti-wicking ability and oil film thermal stability, and is more suitable for industrial applications.

[0062] Comparative Example 2

[0063] Using CN111877003A as Comparative Example 2, an anti-wicking oil-absorbing agent was formulated using 10% perfluorooctanoic acid as an anti-wicking aid. This agent was applied in the first oiling stage, followed by a second oiling stage with conventional spinning oil, a second drafting stage, heat setting, and winding to prepare anti-wicking waterproof polyester fibers. Utilizing a "plum blossom" shaped fiber structure design with multiple grooves, the oil-absorbing function of the grooves is utilized. The oil-absorbing agent is then adhered and fixed to the grooves and fiber surface through heat treatment during the first drafting process.

[0064] Compared with Comparative Example 2, this application uses a fluorine-free organosilicon-modified polyurethane antiwicking oil absorbent, which is environmentally friendly and harmless. It can achieve a firm bond between the oil absorbent and the fiber without relying on a special plum blossom-shaped fiber groove structure, resulting in better antiwicking durability. Furthermore, the spinning process is simpler and easier to industrialize.

[0065] The above-described embodiments are merely illustrative of several feasible implementations of the present invention, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present invention, nor are the embodiments intended to limit the scope of protection in the claims of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention. All equivalent implementations or changes that do not depart from the present invention should be included in the technology of the present invention.

Claims

1. A method for preparing a polyurethane-based anti-wicking oil absorbent, characterized in that, The steps are as follows: Step 1: A dicarboxylic acid reacts with a diisocyanate to obtain a reactive monomer. The dicarboxylic acid is 2,2-bis(hydroxymethyl)propionic acid or 2,3-dihydroxysuccinic acid, and the diisocyanate is at least one of 2,4-toluene diisocyanate, naphthalene diisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate. Step 2: The reactive monomer reacts with polysiloxane monomers and aliphatic diols to obtain organosilicon-modified polyols. The polysiloxane monomers are at least one of terminal aminopropyl polysiloxane, terminal hydroxypropyl polysiloxane, and terminal hydroxypropyl diethyl polysiloxane. The aliphatic diols are ethylene glycol, 1,4-butanediol, or hexanediol. Step 3: The organosilicon-modified polyol reacts with diisocyanate to obtain an anti-oil absorbent, wherein the diisocyanate is an aromatic diisocyanate or an aliphatic diisocyanate.

2. The method for preparing a polyurethane-based anti-wicking oil absorbent according to claim 1, characterized in that: In step one, the molar ratio of dicarboxylic acid to diisocyanate is 1:1.5 ~ 2.

5.

3. The method for preparing a polyurethane-based anti-core oil absorbent according to claim 1, characterized in that: In step one, the reaction temperature is 40 ~ 60℃; in step two, the reaction temperature is 40 ~ 60℃.

4. The method for preparing a polyurethane-based anti-wicking oil absorbent according to claim 1, characterized in that: The amount of aliphatic diol added is 85-98% of the total molar amount of the reactive monomer, polysiloxane monomer, and aliphatic diol, and the molar ratio of the reactive monomer to the polysiloxane monomer is 1:0.8-1.

3.

5. The method for preparing a polyurethane-based anti-core oil absorbent according to claim 1, characterized in that: In step three, the organosilicon-modified polyol reacts with diisocyanate to generate a polyurethane prepolymer with a molecular weight of 2000~4000 g / mol. Then, a diol chain extender or a diamine chain extender is added, and the mixture is stirred evenly to continue the reaction to obtain a reactive anti-core oil absorbent.

6. The method for preparing a polyurethane-based anti-core oil absorbent according to claim 5, characterized in that: The amount of the diol chain extender or diamine chain extender added is 7 to 12% of the mass of the polyurethane prepolymer.

7. The method for preparing a polyurethane-based anti-core oil absorbent according to claim 1, characterized in that: In step three, the organosilicon-modified polyol reacts with diisocyanate to generate a polyurethane polymer with a molecular weight of 8000~15000 g / mol. Then, ethyl acetate or N,N-dimethylformamide is added as a dispersant, and the mixture is ultrasonically dispersed to obtain a non-reactive anti-core oil absorbent.

8. The method for preparing a polyurethane-based anti-core oil absorbent according to claim 7, characterized in that: The amount of dispersant added is 5 to 10% of the mass of the polyurethane polymer.

9. The application of the polyurethane-based anti-wicking oil absorbent of claim 1 in the preparation of anti-wicking polyester industrial yarn.

10. The application according to claim 9, characterized in that: After the polyester chips are melt-spun, they are sequentially subjected to first oiling, multi-stage stretching and heat setting, second oiling, dynamic curing, and winding to obtain anti-wicking polyester industrial yarn. The second oiling uses a polyurethane-based anti-wicking oil absorbent.