Preparation method of fluoride-free anti-wicking polyester industrial yarn

Abstract

The invention provides a preparation method of fluoride-free anti-wicking polyester industrial yarn, and belongs to the technical field of polyester fibers. The preparation method comprises the following steps: preparing a hydrophobic oil agent by taking a polyurethane polymer or a polyurethane prepolymer as a main body; polyester chips are guided into a screw extruder to be subjected to melt extrusion and then flow out through a spinning assembly, and after primary oiling, drafting and heat setting are conducted, secondary oiling is conducted through a hydrophobic oil agent; and dynamically heating the tows subjected to secondary oiling through multiple rollers to finish fiber shaping and oil film curing, and winding to obtain the finished fluoride-free anti-wicking polyester industrial yarn with the wicking height of less than or equal to 7.5 cm. According to the invention, fluorine-containing waterproof oil agents such as C8 and C6 which are commonly adopted by current anti-wicking fibers are abandoned, polyurethane materials which have no toxic and harmful effects on human bodies are used as the anti-wicking oil agents, and the anti-wicking fiber has the characteristics of environmental protection, flexible oiling point location and simple and convenient operation, and can be easily realized by being matched with an existing melt spinning device.

Description

Technical Field

[0001] The present application relates to a method for preparing fluorine-free anti-wicking polyester industrial yarn, belonging to the technical field of polyester fibers. Background Art

[0002] Polyester industrial yarn is an industrial filament with a series of excellent properties such as high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, etc. However, the products currently made of general polyester industrial filament have poor waterproof performance. Therefore, anti-wicking treatment is carried out in the process of preparing polyester industrial yarn, which can reduce the surface tension of the fiber and make the fiber surface difficult to infiltrate, thereby achieving the purpose of water repellency. There is an urgent application demand in the fields of outdoor advertising, conveyor belts, cables, etc. At present, the main component of the hydrophobic agent used for polyester industrial yarn on the market is fluorocarbon chain compounds, such as C8. However, during the use of C8 waterproofing agent, perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS) and other substances may be produced, which will produce biological toxicity accumulation in the human body and endanger human health.

[0003] At present, foreign companies have banned the production and sale of C8 waterproof and oil-proof agents, and domestic companies prefer to choose C6 and C4 short-chain fluorine-containing waterproof agents. However, in the long run, the performance and environmental protection performance of C6 waterproof and oil-proof agents cannot fully meet the relevant requirements. Only by choosing fluorine-free waterproof agents can we better meet the needs of the development of the times.

[0004] So far, there are few studies on fluorine-free waterproofing agents. Patent CN117510756A discloses a method for preparing an anti-wicking agent, which uses a fluorine-free acrylic oil as an anti-wicking oil agent, which can give the fabric a good waterproof effect, but has the disadvantages of poor durable waterproofness and reduced hand feel of the finished fabric, and has not been applied to the field of polyester industrial yarn. Patent CN111877003A discloses an anti-wicking waterproof fiber and a preparation method thereof. The anti-wicking oil agent used in the first oiling and the ordinary oil agent used in the second oiling cannot make the spinning oil agent evenly and fully adhere to the fiber surface, and the waterproof effect is poor. Summary of the invention

[0005] In view of this, the present application provides a method for preparing fluorine-free anti-wicking polyester industrial yarn, which abandons the fluorine-containing waterproof oils such as C8 and C6 commonly used in the current anti-wicking fibers, and selects polyurethane materials that are non-toxic to the human body as the anti-wicking main body. It has environmentally friendly characteristics, is easy to operate, and can be easily achieved using existing melt spinning equipment.

[0006] Specifically, the present application is implemented through the following scheme: A method for preparing fluorine-free anti-wicking polyester industrial yarn, the steps are as follows: Step 1, preparing a hydrophobic oil agent with polyurethane polymer or polyurethane prepolymer as the main component; Step 2: The polyester chips are introduced into a screw extruder for melt extrusion, and then flow out through a spinning assembly, and after the first oiling, drawing, and heat setting, the second oiling is performed with the hydrophobic oil obtained in step 1; Step three, the yarn bundle that has been oiled twice is dynamically heated by multiple rollers to promote and complete fiber shaping and oil film solidification, and then wound to obtain a finished fluorine-free anti-wicking polyester industrial yarn with a wicking height of ≤7.5 cm; after the friction test, the strength retention rate of the polyester industrial yarn is ≥90%.

[0007] The above preparation method selects a completely fluorine-free polyurethane material as the main material of the anti-wicking oil agent, configures a reactive polyurethane oil agent or a non-reactive oil agent, and adopts a separate oiling method on the polyester industrial yarn spinning line. Through oiling during the spinning process and curing of the oil film after stretching and heat setting, the fluorine-free anti-wicking polyester industrial yarn is prepared, which has the advantages of simple operation and good hydrophobicity, and solves the problem that the current use of fluorine-containing oil agents is extremely harmful to human health and the environment. In the above preparation process, dynamic oiling is directly carried out during the fiber spinning process, and the polyester industrial yarn prepared by the one-step method has the characteristics of good waterproof effect, good friction resistance, good water washing resistance, etc.

[0008] Further, as a preference: In step 1, different reaction entities form reactive oil or non-reactive oil: When the main body is a polyurethane prepolymer, a difunctional small molecule is added as a chain extender to form a reactive hydrophobic oil agent, and the added mass percentage of the chain extender relative to the polyurethane prepolymer is 7-12%.

[0009] The chain extender is diol or diamine.

[0010] The molecular weight of the polyurethane prepolymer is 2000-4000 g / mol.

[0011] The second oiling process corresponding to the reactive hydrophobic oil agent is chemical oiling, the oiling speed is 1~5 m / min, the oiling agent temperature is controlled at 50~60 ℃, and the oiling rate is 0.1~0.3 wt%.

[0012] When the main body is a polyurethane polymer, a highly soluble and highly volatile solvent is added as a dispersant to form a non-reactive hydrophobic oil agent, the molecular weight of the polyurethane polymer is 8000~15000 g / mol, and the added mass percentage of the dispersant relative to the polyurethane polymer is 5~10%.

[0013] The dispersant is ethyl acetate or N,N-dimethylformamide (DMF) and the like.

[0014] The second oiling process corresponding to the non-reactive hydrophobic oil agent is physical oiling, the oiling speed is 5~10 m / min, the oiling temperature is controlled at 80~90 ℃, and the oiling rate is 0.3~0.5 wt%.

[0015] The above two oiling steps are implemented after the spinning line is heat-set, and the oiling methods include but are not limited to oiling with an oil tanker and oiling with an oil nozzle.

[0016] In step 2, The polyester chips are high-viscosity chips with a characteristic viscosity of 1.0-1.1 dL / g, a melt extrusion temperature of 280-300°C, and a spinning assembly temperature of 290-300°C.

[0017] The total stretching ratio is 3.5~4.5 times, and the heat setting temperature is 120~140 ℃.

[0018] The first oiling is conventional spinning oiling, and the oiling methods include but are not limited to oiling by oil tanker and oiling by oil nozzle. The oiling speed is 1-5 m / min, the oil temperature is controlled at 20-40 °C, and the oiling rate is 0.4-0.6 wt%.

[0019] In step three, the multi-roller dynamic heating is specifically set as follows: the oiled filament bundle is stretched and shaped by five pairs of rollers, the first pair is a preheating roller, the heating temperature is 70~80 ℃, and the heating time is 5~15 s; the second pair of hot rollers is pre-stretching, the stretching ratio is 1.1~1.3 times, the heating temperature is 90~100 ℃, the third pair is the main stretching, the stretching ratio is 3.5~4.0 times, the heating temperature is 130~150 ℃, and the heating time is 3~10 s; the fourth pair of rollers is the secondary stretching, the stretching ratio is 1.4~1.5 times, the heating temperature is 160~200 ℃, and the fifth pair of rollers are heat-setting rollers, the heating temperature is 180~220 ℃, and the heating time is 3~8 s.

[0020] The tow is heated in contact with each roller to complete the solidification film or reaction film. Physical oiling achieves solidification film by high-temperature volatile oil agent during dynamic heating of multiple rollers, and chemical oiling achieves reactive film by high-temperature chain extension during dynamic heating of multiple rollers. Oiling is combined with dynamic heating of multiple rollers, and the fiber spinning oiling method is used to achieve the process of uniform attachment of oil agent to the fiber surface.

[0021] The winding speed is 3800-4500 m / min, and the filament bundle is wound at a high speed.

[0022] Compared with the existing anti-wicking fiber preparation technology, the beneficial effects of the present application are summarized as follows: (1) Compared with the waterproof oil containing perfluorooctane sulfonyl derivatives (PFOS) and perfluorooctanoic acid (PFOA) commonly used in the polyester field, the present invention uses a fluorine-free polyurethane oil, which is non-toxic and harmless to human health and the environment, and has outstanding environmental advantages.

[0023] (2) Compared with other fluorine-free anti-wicking oil absorption agents, the polyurethane anti-wicking oil absorption agent used in the present invention can not only give the polyester industrial yarn good hydrophobicity, but also has excellent friction resistance. After the friction test, the strength retention rate of the polyester industrial yarn is greater than 90%, so that the polyester industrial yarn prepared by the present invention has excellent wear resistance.

[0024] (3) The method proposed in the present invention can be completed using existing melt spinning devices and equipment, without the need to add or purchase new processing equipment, and the cost of technical improvement is low.

[0025] (4) Although the fluorine-free anti-wicking oil agents reported in existing research have low toxicity, most of them cannot achieve the ideal anti-wicking effect. The fluorine-free anti-wicking fiber prepared by the present invention has a wicking height of less than 7.5 cm, which is both environmentally friendly and has a good anti-wicking effect, comparable to fluorine-containing anti-wicking oil agents. DETAILED DESCRIPTION

[0026] In order 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 in combination with the specific cases 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 used to limit the technical solutions of this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] Example 1

[0028] The present embodiment provides a method for preparing a fluorine-free anti-wicking polyester industrial yarn, and the steps are as follows: Step 1, preparation of hydrophobic oil agent: using polyurethane polymer (molecular weight of 8000 g / mol) as the main material and highly soluble and highly volatile ethyl acetate as the solvent, a hydrophobic oil agent specifically for polyester industrial yarn is prepared. During the preparation process, the added mass percentage of ethyl acetate relative to the polyurethane polymer is 5%.

[0029] Step 2, oiling the spinning line: high-viscosity PET chips are used as raw materials, introduced into a screw extruder for melt extrusion, and after flowing out through the spinning assembly, they are subjected to the first oiling, stretching, and heat setting, and then oiled for the second time using the above-mentioned hydrophobic oil agent.

[0030] The intrinsic viscosity of high-viscosity PET chips is 1.0 dL / g, the melt extrusion temperature is 280 ℃, and the spinning component temperature is 290 ℃.

[0031] The first and second oiling passes were both oiled by tanker, where the first oiling speed was 1 m / min and the oil temperature was controlled at 20 °C; the second oiling speed was 10 m / min and the oil temperature was controlled at 90 °C. The total oiling rate of the first and second oiling passes was 0.7 wt%.

[0032] The draft ratio was 3.5 and the heat setting temperature was 120 °C.

[0033] Step 3, oil film solidification of spinning line: The tow after two oiling passes through multiple rollers for dynamic heating to promote fiber shaping and oil film solidification. The tow is wound by high-speed winding to obtain anti-wicking polyester industrial yarn. Among them, the specific setting of multi-roller dynamic heating is: the oiled tow passes through five pairs of rollers for stretching and shaping, the first pair is a preheating roller, the heating temperature is 70℃, and the heating time is 5 s; the second pair of hot rollers is pre-stretching, the stretching multiple is 1.1 times, the heating temperature is 90℃, the third pair of main stretching, the stretching multiple is 3.5 times, the heating temperature is 130℃, the heating time is 3 s, the fourth pair of rollers is secondary stretching, the stretching multiple is 1.4 times, the heating temperature is 160℃, and the fifth pair of rollers is a heat setting roller, the heating temperature is 180℃, and the heating time is 3 s. During the contact heating process between the tow and each roller, the oil agent evaporates at high temperature to complete the curing and film formation. The winding speed is 3800 m / min.

[0034] After testing, the wicking height of the fluorine-free anti-wicking polyester industrial yarn prepared in this embodiment is 6.3 cm; after the friction test, the strength retention rate of the polyester industrial yarn is 90%.

[0035] Example 2

[0036] The present embodiment provides a method for preparing a fluorine-free anti-wicking polyester industrial yarn, and the steps are as follows: Step 1, preparation of hydrophobic oil agent: using polyurethane polymer (molecular weight 11000 g / mol) as the main material and highly soluble and highly volatile DMF as the solvent, a hydrophobic oil agent specially used for polyester industrial yarn is prepared. In the preparation process, the added mass percentage of DMF relative to the polyurethane polymer is 7%.

[0037] Step 2, oiling the spinning line: high-viscosity PET chips are used as raw materials, introduced into a screw extruder for melt extrusion, and after flowing out through the spinning assembly, they are subjected to the first oiling, stretching, and heat setting, and then oiled for the second time using the above-mentioned hydrophobic oil agent.

[0038] The intrinsic viscosity of high-viscosity PET chips is 1.02 dL / g, the melt extrusion temperature is 290 ℃, and the spinning component temperature is 300 ℃.

[0039] Both the first and second oiling are done by oil tanker. The first oiling speed is 2 m / min and the oil temperature is controlled at 25 °C. The second oiling speed is 7 m / min and the oil temperature is controlled at 85 °C. The total oiling rate of the first and second oiling is 0.9 wt%.

[0040] The draft ratio was 3.5 and the heat setting temperature was 130 °C.

[0041] Step 3, oil film solidification of spinning line: The tow after two oiling passes through multiple rollers for dynamic heating to promote fiber shaping and oil film solidification. The tow is wound by high-speed winding to obtain anti-wicking polyester industrial yarn. Among them, the specific setting of multi-roller dynamic heating is: the oiled tow passes through five pairs of rollers for stretching and shaping, the first pair is a preheating roller, the heating temperature is 72°C, and the heating time is 7 s; the second pair of hot rollers is pre-stretching, the stretching multiple is 1.2 times, the temperature is 93°C, the third pair of main stretching, the stretching multiple is 3.6 times, the temperature is 135°C, the heating time is 4 s, the fourth pair of rollers is secondary stretching, the stretching multiple is 1.45 times, the heating temperature is 170°C, and the fifth pair of rollers is a heat setting roller, the heating temperature is 190°C, and the heating time is 4 s. During the contact heating process between the tow and each roller, the oil agent evaporates at high temperature to complete the curing and film formation. The winding speed is 3900 m / min.

[0042] After testing, the wicking height of the fluorine-free anti-wicking polyester industrial yarn prepared in this embodiment is 6.1 cm. After the friction test, the strength retention rate of the polyester industrial yarn is 92%.

[0043] Example 3

[0044] The present embodiment provides a method for preparing a fluorine-free anti-wicking polyester industrial yarn, and the steps are as follows: Step 1, preparation of hydrophobic oil agent: using polyurethane polymer (molecular weight of 15000 g / mol) as the main material and highly soluble and highly volatile ethyl acetate as the solvent, a hydrophobic oil agent specifically for polyester industrial yarn is prepared. During the preparation process, the added mass percentage of ethyl acetate relative to the polyurethane polymer is 10%.

[0045] Step 2, oiling the spinning line: high-viscosity PET chips are used as raw materials, introduced into a screw extruder for melt extrusion, and after flowing out through the spinning assembly, they are subjected to the first oiling, stretching, and heat setting, and then oiled for the second time using the above-mentioned hydrophobic oil agent.

[0046] The intrinsic viscosity of high-viscosity PET chips is 1.03 dL / g, the melt extrusion temperature is 280 ℃, and the spinning component temperature is 290 ℃.

[0047] Both the first and second oiling are done by oil tanker. The first oiling speed is 3 m / min and the oil temperature is controlled at 30 °C. The second oiling speed is 5 m / min and the oil temperature is controlled at 80 °C. The total oiling rate of the first and second oiling is 1.1 wt%.

[0048] The draft ratio was 4.0 and the heat setting temperature was 130 °C.

[0049] Step 3, oil film solidification of spinning line: The tow after two oiling passes through multiple rollers for dynamic heating to promote fiber shaping and oil film solidification. The tow is wound by high-speed winding to obtain anti-wicking polyester industrial yarn. Among them, the specific setting of multi-roller dynamic heating is: the oiled tow passes through five pairs of rollers for stretching and shaping, the first pair is a preheating roller, the heating temperature is 75°C, and the heating time is 9 s; the second pair of hot rollers is pre-stretching, the stretching multiple is 1.2 times, the temperature is 96°C, the third pair of main stretching, the stretching multiple is 3.7 times, the temperature is 140°C, the heating time is 5 s, the fourth pair of rollers is secondary stretching, the stretching multiple is 1.46 times, the heating temperature is 180°C, and the fifth pair of rollers is a heat setting roller, the heating temperature is 200°C, and the heating time is 5 s. During the contact heating process between the tow and each roller, the high temperature promotes chain extension to complete reactive film formation. The winding speed is 4000 m / min.

[0050] After testing, the wicking height of the fluorine-free anti-wicking polyester industrial yarn prepared in this embodiment is 5.2 cm. After the friction test, the strength retention rate of the polyester industrial yarn is 93%.

[0051] Example 4

[0052] The present embodiment provides a method for preparing a fluorine-free anti-wicking polyester industrial yarn, and the steps are as follows: Step 1, preparation of hydrophobic oil agent: using polyurethane prepolymer (molecular weight of 2000 g / mol) as the main material and ethylene glycol as the chain extender, a hydrophobic oil agent specifically for polyester industrial yarn is prepared. During the preparation process, the added mass percentage of ethylene glycol relative to the polyurethane prepolymer is 7%.

[0053] Step 2, oiling the spinning line: high-viscosity PET chips are used as raw materials, introduced into a screw extruder for melt extrusion, and after flowing out through the spinning assembly, they are subjected to the first oiling, stretching, and heat setting, and then oiled for the second time using the above-mentioned hydrophobic oil agent.

[0054] The intrinsic viscosity of high-viscosity PET chips is 1.05 dL / g, the melt extrusion temperature is 300 ℃, and the spinning component temperature is 300 ℃.

[0055] The first and second oiling passes were both oiled with an oil nozzle. The first oiling speed was 4 m / min, and the oil temperature was controlled at 30 °C. The second oiling speed was 1 m / min, and the oil temperature was controlled at 50 °C. The total oiling rate of the first and second oiling passes was 0.5 wt%.

[0056] The draft ratio was 4.5 and the heat setting temperature was 140 °C.

[0057] Step 3, oil film solidification of spinning line: The tow after two oiling passes through multiple rollers for dynamic heating to promote fiber shaping and oil film solidification. The tow is wound by high-speed winding to obtain anti-wicking polyester industrial yarn. Among them, the specific setting of multi-roller dynamic heating is: the oiled tow passes through five pairs of rollers for stretching and shaping, the first pair is a preheating roller, the heating temperature is 77°C, and the heating time is 11 s; the second pair of hot rollers is pre-stretching, the stretching multiple is 1.3 times, the temperature is 95°C, the third pair of main stretching, the stretching multiple is 3.8 times, the temperature is 135°C, the heating time is 7 s, the fourth pair of rollers is secondary stretching, the stretching multiple is 1.48 times, the heating temperature is 190°C, and the fifth pair of rollers is a heat setting roller, the heating temperature is 200°C, and the heating time is 6 s. During the contact heating process between the tow and each roller, the high temperature promotes chain extension to complete reactive film formation. The winding speed is 4200 m / min.

[0058] After testing, the wicking height of the fluorine-free anti-wicking polyester industrial yarn prepared in this embodiment is 3.1 cm. After the friction test, the strength retention rate of the polyester industrial yarn is 95%.

[0059] Example 5

[0060] The present embodiment provides a method for preparing a fluorine-free anti-wicking polyester industrial yarn, and the steps are as follows: Step 1, preparation of a hydrophobic oil agent: using a polyurethane prepolymer (molecular weight of 3000 g / mol) as the main material and ethylenediamine as a chain extender, a hydrophobic oil agent specifically for polyester industrial yarn is prepared. During the preparation process, the added mass percentage of ethylenediamine relative to the polyurethane prepolymer is 10%.

[0061] Step 2, oiling the spinning line: high-viscosity PET chips are used as raw materials, introduced into a screw extruder for melt extrusion, and after flowing out through the spinning assembly, they are subjected to the first oiling, stretching, and heat setting, and then oiled for the second time using the above-mentioned hydrophobic oil agent.

[0062] The intrinsic viscosity of high-viscosity PET chips is 1.08 dL / g, the melt extrusion temperature is 280 ℃, and the spinning component temperature is 295 ℃.

[0063] The first oiling is done by oil tanker, and the second oiling is done by oil nozzle. The oiling speed of the first oiling is 4 m / min, and the oil temperature is controlled at 35 ℃; the oiling speed of the second oiling is 3 m / min, and the oil temperature is controlled at 55 ℃. The total oiling rate of the first and second oiling is 0.7 wt%.

[0064] The draft ratio was 3.5 and the heat setting temperature was 120 °C.

[0065] Step 3, oil film solidification of spinning line: The tow after two oiling passes through multiple rollers for dynamic heating to promote fiber shaping and oil film solidification. The tow is wound by high-speed winding to obtain anti-wicking polyester industrial yarn. Among them, the specific setting of multi-roller dynamic heating is: the oiled tow passes through five pairs of rollers for stretching and shaping, the first pair is a preheating roller, the heating temperature is 75°C, and the heating time is 13 s; the second pair of hot rollers is pre-stretching, the stretching multiple is 1.2 times, the temperature is 98°C, the third pair of main stretching, the stretching multiple is 3.9 times, the temperature is 145°C, the heating time is 9 s, the fourth pair of rollers is secondary stretching, the stretching multiple is 1.48 times, the heating temperature is 195°C, and the fifth pair of rollers is a heat setting roller, the heating temperature is 210°C, and the heating time is 7 s. During the contact heating process between the tow and each roller, the high temperature promotes chain extension to complete reactive film formation. The winding speed is 4400 m / min.

[0066] After testing, the wicking height of the fluorine-free anti-wicking polyester industrial yarn prepared in this embodiment is 4.5 cm. After the friction test, the strength retention rate of the polyester industrial yarn is 96%.

[0067] Example 6

[0068] The present embodiment provides a method for preparing a fluorine-free anti-wicking polyester industrial yarn, and the steps are as follows: Step 1, preparation of hydrophobic oil agent: using polyurethane prepolymer (molecular weight of 4000 g / mol) as the main material and ethylene glycol as the chain extender, a hydrophobic oil agent specifically for polyester industrial yarn is prepared. During the preparation process, the added mass percentage of ethylene glycol relative to the polyurethane prepolymer is 12%.

[0069] Step 2, oiling the spinning line: high-viscosity PET chips are used as raw materials, introduced into a screw extruder for melt extrusion, and after flowing out through the spinning assembly, they are subjected to the first oiling, stretching, and heat setting, and then oiled for the second time using the above-mentioned hydrophobic oil agent.

[0070] The intrinsic viscosity of high-viscosity PET chips is 1.0 dL / g, the melt extrusion temperature is 280 ℃, and the spinning component temperature is 290 ℃.

[0071] Both the first and second oiling are done by oil tanker. The first oiling speed is 5 m / min and the oil temperature is controlled at 40 °C. The second oiling speed is 5 m / min and the oil temperature is controlled at 60 °C. The total oiling rate of the first and second oiling is 0.9 wt%.

[0072] The draft ratio was 4.5 and the heat setting temperature was 130 °C.

[0073] Step 3, oil film solidification of spinning line: The filament bundle after the second oiling is dynamically heated by multiple rollers to promote fiber shaping and oil film solidification. The filament bundle is wound by high-speed winding to obtain anti-wicking polyester industrial yarn. Among them, the specific setting of multi-roller dynamic heating is: the oiled filament bundle is stretched and shaped by five pairs of rollers, the first pair is a preheating roller, the heating temperature is 80℃, and the heating time is 15 s; the second pair of hot rollers is pre-stretching, the stretching multiple is 1.3 times, the temperature is 100℃, the third pair of main stretching, the stretching multiple is 4.0 times, the temperature is 150℃, the heating time is 10 s, the fourth pair of rollers is secondary stretching, the stretching multiple is 1.5 times, the heating temperature is 200℃, and the fifth pair of rollers is a heat setting roller, the heating temperature is 220℃, and the heating time is 8 s. During the contact heating process between the filament bundle and each roller, the high temperature promotes chain extension to complete reactive film formation. The winding speed is 4500 m / min.

[0074] After testing, the wicking height of the fluorine-free anti-wicking polyester industrial yarn prepared in this embodiment is 3.2 cm. After the friction test, the strength retention rate of the polyester industrial yarn is 95%.

[0075] The above-mentioned embodiments only express several feasible implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention, and the embodiments are not used to limit the scope of protection in the claims of the present invention. For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and 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 fluorine-free anti-wicking polyester industrial yarn, characterized in that: Here are the steps: Step 1, preparing a hydrophobic oil agent with polyurethane polymer or polyurethane prepolymer as the main component; Step 2: The polyester chips are introduced into a screw extruder for melt extrusion, and then flow out through a spinning assembly, and after the first oiling, drawing, and heat setting, the second oiling is performed with the hydrophobic oil obtained in step 1; Step three, the yarn bundle that has been oiled twice is dynamically heated by multiple rollers to complete fiber shaping and oil film solidification, and is wound to obtain the finished fluorine-free anti-wicking polyester industrial yarn with a wicking height of ≤7.5 cm.

2. The method for preparing a fluorine-free anti-wicking polyester industrial yarn according to claim 1, characterized in that: The hydrophobic oil agent is a reactive oil agent, which is mainly composed of a polyurethane prepolymer with a molecular weight of 2000-4000 g / mol, and a difunctional small molecule is added as a chain extender to form the hydrophobic oil agent, and the added mass percentage of the chain extender relative to the polyurethane prepolymer is 7-12%.

3. The method for preparing a fluorine-free anti-wicking polyester industrial yarn according to claim 2, characterized in that: The chain extender is a diol or a diamine.

4. The method for preparing a fluorine-free anti-wicking polyester industrial yarn according to claim 2, characterized in that: The second oiling is carried out by chemical oiling, the oiling speed is 1-5 m / min, the oiling agent temperature is controlled at 50-60°C, and the oiling rate is 0.1-0.3 wt%.

5. The method for preparing a fluorine-free anti-wicking polyester industrial yarn according to claim 1, characterized in that: The hydrophobic oil agent is a non-reactive oil agent, which is mainly composed of a polyurethane polymer with a molecular weight of 8000-15000 g / mol, and a dispersant is added to form the hydrophobic oil agent, and the added mass percentage of the dispersant relative to the polyurethane polymer is 5-10%.

6. The method for preparing a fluorine-free anti-wicking polyester industrial yarn according to claim 5, characterized in that: The dispersant is ethyl acetate or N,N-dimethylformamide.

7. The method for preparing a fluorine-free anti-wicking polyester industrial yarn according to claim 5, characterized in that: The second oiling is carried out by physical method, the oiling speed is 5-10 m / min, the oil temperature is controlled at 80-90°C, and the oiling rate is 0.3-0.5 wt%.

8. The method for preparing a fluorine-free anti-wicking polyester industrial yarn according to any one of claims 1 to 7, characterized in that: The polyester chips are high-viscosity chips with a characteristic viscosity of 1.0-1.1 dL / g, a melt extrusion temperature of 280-300°C, and a spinning assembly temperature of 290-300°C.

9. The method for preparing a fluorine-free anti-wicking polyester industrial yarn according to any one of claims 1 to 7, characterized in that: In step 2, the first oiling is conventional spinning oiling, using an oil wheel or an oil nozzle, the oiling speed is 1-5 m / mim, the oil temperature is controlled at 20-40 °C, and the oiling rate is 0.4-0.6 wt%; the total stretching ratio after the first oiling is 3.5-4.5 times, and the heat setting temperature is 120-140 °C.

10. The method for preparing a fluorine-free anti-wicking polyester industrial yarn according to any one of claims 1 to 7, characterized in that: In step three, the multi-roller dynamic heating is carried out by five pairs of rollers, the first pair of rollers are preheating rollers, the heating temperature is 70~80℃, and the heating time is 5~15 s; the second pair of rollers are pre-stretching rollers, the stretching ratio is 1.1~1.3 times, the heating temperature is 90~100℃, the third pair of rollers are main stretching rollers, the stretching ratio is 3.5~4.0 times, the heating temperature is 130~150℃, and the heating time is 3~10 s, the fourth pair of rollers are secondary stretching rollers, the stretching ratio is 1.4~1.5 times, the heating temperature is 160~200℃, the fifth pair of rollers are heat setting rollers, the heating temperature is 180~220℃, and the heating time is 3~8 s. The filament bundle is contact-heated with each roller to complete the solidification film or reaction film.