High-strength and high-weather-resistance long-fiber polyester base cloth and preparation method thereof

Abstract

The invention belongs to the technical field of preparation of textile materials, and particularly relates to high-strength and high-weather-resistance long-fiber polyester base cloth and a preparation method of the high-strength and high-weather-resistance long-fiber polyester base cloth. The preparation method of the high-strength and high-weather-resistance long-fiber polyester tire base cloth comprises the following steps of crystallization drying, melt extrusion, spinning drafting, needling reinforcement, hot rolling and gum dipping. According to the prepared high-strength and high-weather-resistance long-fiber polyester base cloth, the viscous creep quantity is 0.30-0.35 mm, the bonding firmness of a product is high, the elongation is 57-65%, the longitudinal tensile strength is 655-685 N / 5 cm, the transverse tensile strength is 539-570 N / 5 cm, the mechanical property of the base cloth is excellent, the yellowing degree delta YI of an ultraviolet aging test is 1.5-1.6, and the weather resistance of the product is high.

Description

Technical Field

[0001] This invention belongs to the field of textile material preparation technology, specifically relating to a high-strength, high-weather-resistant long-fiber polyester base fabric and its preparation method. Background Technology

[0002] Polyester, as an important synthetic fiber material, can be produced into two types of products: long fibers and short fibers through different production processes. Among them, long polyester fibers are widely used in textiles, construction, automobiles and other fields due to their advantages such as lightweight, high strength and corrosion resistance. Short polyester fibers, on the other hand, are mostly used in plastic products, carpets, water treatment filters and other applications due to their good dispersibility and cost-effectiveness, and are one of the mainstream engineering plastics at present.

[0003] In the field of tire base fabric, early products were mostly prepared using short fiber carding and needle punching consolidation processes. However, the bonding force between short fibers is relatively weak, and local damage is prone to occur under repeated stress. This not only significantly shortens the service life of the base fabric but also increases the later maintenance costs. To overcome this performance bottleneck, the industry has gradually shifted to the research and development of long fiber polyester tire base fabric. Some processes use polyester chips to directly spin into webs, eliminating intermediate steps such as cutting and carding in short fiber production. This shortens the production process, improves production efficiency, and reduces fiber damage, allowing long fibers to maintain a more complete shape and stronger mechanical continuity. This, in turn, enhances the cohesion between fibers and the overall structural stability, resulting in a qualitative improvement in the core properties of tire base fabric, such as tensile strength, tear resistance, and abrasion resistance.

[0004] The impregnation process is crucial for optimizing the performance of the base fabric. Among existing long-fiber base fabric preparation technologies, starch impregnation is an economical and efficient pretreatment method. It can effectively improve the strength of the base fabric and extend its processing life. Specifically, through impregnation and drying, starch solution forms a protective film on the fiber surface. This film not only firmly coats and bonds each fiber, reducing slippage and frictional loss under stress, but also significantly improves the base fabric's elongation at constant load, tear resistance, and fatigue resistance. Furthermore, it improves the base fabric's dimensional stability, abrasion resistance, and weather resistance. However, while starch impregnation has these advantages, it also has corresponding disadvantages. Starch-based materials are prone to breakage under high temperature, humid heat, or repeated stress, resulting in insufficient weather resistance and durability of the adhesive layer, reducing the overall strength of polyester tires and making them unsuitable for long-term use in harsh environments such as outdoor and construction sites.

[0005] Patent CN117604774A discloses a hydrophobic polyester base fabric, its preparation method, and a waterproof membrane. The method mainly prepares a modified corn starch layer by reacting a composition of corn starch, a hydrophobic modifier, and hydrophobic silica. The resulting polyester base fabric has strong hydrophobicity, which enhances its waterproof performance. However, this method reduces the bonding strength with the fibers during impregnation, resulting in a decrease in the durability and strength of the polyester base fabric. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method for preparing high-strength, high-weather-resistant long-fiber polyester base fabric, which ensures that the long-fiber polyester base fabric has good strength and impregnation effect.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric includes the following steps: crystallization drying, melt extrusion, spinning and stretching, needle punching reinforcement, hot rolling, and impregnation.

[0008] The crystallization drying method is as follows: fiber-grade semi-dull polyester chips are placed in a crystallization bed, the equipment temperature is controlled at 175-185℃, the crystallization time is 10-20 min, after crystallization, the product is placed in a container and dried at 165-175℃ for 5-7 h, and after drying, dried polyester chips are obtained.

[0009] The melt extrusion method involves mixing dried polyester chips with weather-resistant additives and dispersants, mixing them evenly, and then adding the mixture to an extruder. The temperature of each heating zone of the screw extruder is controlled at 260-305℃. After extrusion, the extruded melt is filtered, and the pressure of the filter instrument is controlled at 6.5-12 MPa. After filtration, the filtered melt is obtained. The weather-resistant additive is HALS; the dispersant is zinc stearate; The mass ratio of the dried polyester chips, weather-resistant additives, and dispersants is 80-85:0.5-1:1-2.

[0010] The spinning and drawing method involves placing the filtered melt in a spinning machine and extruding it through a spinneret to form nascent fiber filaments. The initial pressure of the spinning assembly is controlled at 15-25 MPa, the temperature of the heat transfer medium in the spinning system is controlled at 280-305℃, the nascent fibers are cooled by side blowing air, and the side blowing air temperature is controlled at 18-26℃, the relative humidity is controlled at 60-65%, the static pressure in the air duct is controlled at 400-600 Pa, and the air velocity is controlled at 0.3-0.8 m / s. The cooled nascent fibers are then drawn using an airflow drawing device, and the airflow drawing pressure is controlled at 0.3-1.0 MPa. After drawing, the drawn filament bundle is obtained.

[0011] The needle-punching reinforcement method involves mechanically separating the drawn filament bundles, placing the separated filament bundles into a filament oscillator, controlling the oscillator frequency at 400-800 n / min and the oscillation amplitude at 35-65 mm to obtain a filament bundle. The filament bundle is then evenly laid on a web forming curtain to form a fiber web. The web forming machine process speed is controlled at 5-15 m / min, the pre-pressing roller temperature at 100-160℃, and the suction wind speed at 2-10 m / min. The fiber web is then needle-punched for reinforcement, controlling the needle density of the needle punching machine at 3000-5000 needles / m, the needle punching frequency at 800-1500 times / min, the needle punching stroke at 20-40 mm, the needle punching depth at 3-10 mm, and the needle punching density at 23-36 needles / cm². After needle punching, a needle-punched semi-finished fabric is obtained.

[0012] The hot rolling method involves heat-setting the needle-punched semi-finished fabric at 150-180℃ for unit mesh. After the setting is completed, the set semi-finished fabric is placed in a hot rolling mill, and the temperature of the hot rolling rollers is controlled at 180-200℃ and the pressure at 50-60 bar. After hot rolling, the hot-rolled base fabric is obtained.

[0013] The impregnation method is as follows: deionized water, composite starch, water-soluble polymeric ultraviolet absorber and initiator are added to a reaction vessel and stirred evenly to obtain a composite adhesive. The temperature of the reaction vessel is raised to 65-75℃, and the hot-rolled base fabric is immersed in the composite adhesive for 30-50 minutes. After impregnation, the impregnated base fabric is pre-dried using a rotary screen through-drying method, with the pre-drying temperature controlled at 120-160℃ and the pre-drying time controlled at 20-30 minutes. After pre-drying, the base fabric is dried using a rotary screen through-drying method, with the drying temperature controlled at 190-230℃ and the drying time controlled at 10-20 minutes. After drying, a high-strength, high-weather-resistant long-fiber polyester base fabric is obtained. The mass ratio of the deionized water, composite starch, water-soluble polymeric ultraviolet absorber, and initiator is 81-88:8-12:4-6:0.1-0.3. The water-soluble polymeric ultraviolet absorber is 2,4-dihydroxybenzophenone; The initiator is ammonium persulfate.

[0014] The method for preparing the composite starch is as follows: polyethylene glycol diglycidyl ether and 3,3-dithiodipropionic acid dihydrazide are added to a container, the container temperature is controlled at 55-65℃, and the reaction is carried out under nitrogen for 1.5-2 hours. After the reaction is completed, a composite modifier is obtained. Corn starch is slowly added to deionized water while stirring, and the stirring speed is controlled at 100-120 r / min. The container temperature is heated to 75-85℃, and stirring is maintained during the process. After the system becomes a uniform and transparent paste, the temperature is kept high for 30-40 minutes for gelatinization. After gelatinization is completed, the mixture is sieved to obtain a filtered starch paste. The filtered starch paste and catalyst are added to the composite modifier, the container temperature is controlled at 85-95℃, and the reaction time is 3-5 hours. After the reaction is completed, the mixture is washed, precipitated, filtered, and dried to obtain the composite starch. The catalyst is tetrabutylammonium bromide; The sieve used for sieving is 100 mesh; The mass ratio of polyethylene glycol diglycidyl ether to 3,3-dithiodipropionic acid dihydrazide is 1:1.5-2.5; The mass ratio of corn starch to deionized water is 10:45-55; The mass ratio of the filtered starch paste, catalyst, and composite modifier is 55-65:0.05:1.5-2.

[0015] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The composite modifier prepared in this invention reacts with the hydrazide group and the epoxy three-membered ring to form a composite modifier molecule containing epoxy and hydrazide groups. After corn starch gelatinization, the hydroxyl groups on the molecular chain are exposed, and the epoxy group of the composite modifier undergoes a ring-opening reaction with the starch hydroxyl group to form an ether bond, which firmly grafts the modifier onto the starch molecular chain. In the drying step of the impregnation process, the hydrazide group in the grafted chain undergoes an exchange reaction with the ester group of the polyester fiber to generate hydrazide ester bond, which achieves covalent connection with the polyester backbone and improves the adhesion between the adhesive layer and the polyester fiber.

[0016] 2. The high-strength, high-weather-resistant long-fiber polyester base fabric prepared by this invention has an adhesive creep of 0.30-0.35 mm, strong adhesion, strong product bonding, elongation of 57-65%, longitudinal tensile strength of 655-685 N / 5 cm, and transverse tensile strength of 539-570 N / 5 cm. The base fabric has excellent mechanical properties, and the yellowing degree ΔYI in the ultraviolet aging test is 1.5-1.6, indicating strong weather resistance.

[0017] Example 1 A method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric includes the following steps: crystallization drying, melt extrusion, spinning and stretching, needle punching reinforcement, hot rolling, and impregnation.

[0018] (1) Crystallization and drying Fiber-grade semi-dull polyester chips were placed in a crystallization bed, and the equipment temperature was controlled at 180℃ for 15 minutes. After crystallization, the product was placed in a container and dried at 170℃ for 6 hours. After drying, dried polyester chips were obtained.

[0019] (2) Melt extrusion The dried polyester chips are mixed with weather-resistant additives and dispersants. After the mixture is evenly mixed, it is added to the extruder. The temperature of each heating zone of the screw extruder is controlled at 280℃. After extrusion, the extruded melt is filtered. The pressure of the filter instrument is controlled at 10 MPa. After filtration, the filtered melt is obtained. The weather-resistant additive is HALS; the dispersant is zinc stearate; The mass ratio of the dried polyester chips, weather-resistant additives, and dispersant is 83:0.7:1.5.

[0020] (3) Spinning and drawing The filtered melt is placed in a spinning machine and extruded through a spinneret to form nascent fiber filaments. The initial pressure of the spinning assembly is controlled at 20 MPa, the temperature of the heat transfer medium in the spinning system is controlled at 295°C, the nascent fibers are cooled by side blowing, the side blowing air temperature is controlled at 21°C, the relative humidity is 63%, the static pressure in the air duct is 500 Pa, and the air velocity is 0.5 m / s. The cooled nascent fibers are then stretched using an airflow stretching device, with the airflow stretching pressure controlled at 0.7 MPa. After stretching, the stretched filament bundle is obtained.

[0021] (4) Acupuncture reinforcement The drawn filament bundles are mechanically separated and placed into a filament oscillator. The oscillator frequency is controlled at 600 rpm and the oscillation amplitude is 50 mm to obtain the filament bundles. The filament bundles are then evenly laid on a web forming curtain to form a fiber web. The web forming machine process speed is controlled at 10 m / min, the pre-pressing roller temperature is 130℃, and the suction air speed is 7 m / min. The fiber web is then needle-punched for reinforcement. The needle-punching machine needle density is controlled at 4000 needles / m, the needle-punching frequency is 1100 times / min, the needle-punching stroke is 30 mm, the needle-punching depth is 7 mm, and the needle-punching density is 29 needles / cm². After the needle-punching is completed, the needle-punched semi-finished fabric is obtained.

[0022] (5) Hot rolling The needle-punched semi-finished fabric is heat-set at 170℃ for unit mesh. After the setting is completed, the set semi-finished fabric is placed in a hot rolling mill, and the temperature of the hot rolling roller is controlled at 190℃ and the pressure is 55 bar. After the hot rolling is completed, the hot-rolled base fabric is obtained.

[0023] (6) Impregnation A. Preparation of composite starch Polyethylene glycol diglycidyl ether and 3,3-dithiodipropionic acid dihydrazide were added to a container, and the container temperature was controlled at 60℃. The reaction was carried out under nitrogen for 1.7 h. After the reaction was completed, a composite modifier was obtained. Corn starch was slowly added to deionized water while stirring. The stirring speed was controlled at 110 r / min. The container temperature was heated to 80℃ while stirring was maintained. After the system became a uniform and transparent paste, it was kept at the temperature for another 35 min for gelatinization. After gelatinization, the paste was sieved to obtain a filtered starch paste. The filtered starch paste and catalyst were added to the composite modifier. The container temperature was controlled at 90℃ and the reaction time was 4 h. After the reaction was completed, the paste was washed, precipitated, filtered and dried to obtain the composite starch. The catalyst is tetrabutylammonium bromide; The sieve used for sieving is 100 mesh; The mass ratio of the polyethylene glycol diglycidyl ether to 3,3-dithiodipropionic acid dihydrazide is 1:2; The mass ratio of corn starch to deionized water is 10:50; The mass ratio of the filtered starch paste, catalyst, and composite modifier is 60:0.05:1.7.

[0024] B. Impregnation and drying Deionized water, composite starch, water-soluble polymer UV absorber, and initiator were added to a reaction vessel and stirred until homogeneous to obtain a composite adhesive. The temperature of the reaction vessel was raised to 70°C, and the hot-rolled base fabric was immersed in the composite adhesive for 40 minutes. After immersion, the base fabric was pre-dried using a rotary screen through-drying method at a temperature of 140°C for 25 minutes. After pre-drying, the base fabric was dried using a rotary screen through-drying method at a temperature of 210°C for 15 minutes. After drying, a high-strength, high-weather-resistant long-fiber polyester base fabric was obtained. The mass ratio of the deionized water, composite starch, water-soluble polymeric ultraviolet absorber, and initiator is 85:11:5:0.2. The water-soluble polymeric ultraviolet absorber is 2,4-dihydroxybenzophenone; The initiator is ammonium persulfate.

[0025] Example 2 A method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric includes the following steps: crystallization drying, melt extrusion, spinning and stretching, needle punching reinforcement, hot rolling, and impregnation.

[0026] (1) Crystallization and drying Fiber-grade semi-dull polyester chips were placed in a crystallization bed, and the equipment temperature was controlled at 175℃ for 10 minutes. After crystallization, the product was placed in a container and dried at 165℃ for 5 hours. After drying, dried polyester chips were obtained.

[0027] (2) Melt extrusion The dried polyester chips are mixed with weather-resistant additives and dispersants. After the mixture is evenly mixed, it is added to the extruder. The temperature of each heating zone of the screw extruder is controlled at 260℃. After extrusion, the extruded melt is filtered. The pressure of the filter instrument is controlled at 6.5 MPa. After filtration, the filtered melt is obtained. The weather-resistant additive is HALS; the dispersant is zinc stearate; The mass ratio of the dried polyester chips, weather-resistant additives, and dispersant is 80:0.5:1.

[0028] (3) Spinning and drawing The filtered melt is placed in a spinning machine and extruded through a spinneret to form nascent fiber filaments. The initial pressure of the spinning assembly is controlled at 15 MPa, the temperature of the heat transfer medium in the spinning system is controlled at 280℃, the nascent fiber is cooled by side blowing, the side blowing air temperature is controlled at 18℃, the relative humidity is 60%, the static pressure in the air duct is 400 Pa, and the air velocity is 0.3 m / s. The cooled nascent fiber is then stretched using an airflow stretching device, with the airflow stretching pressure controlled at 0.3 MPa. After stretching, the stretched filament bundle is obtained.

[0029] (4) Acupuncture reinforcement The drawn filament bundles are mechanically separated and placed into a filament oscillator. The oscillator frequency is controlled at 400 rpm and the oscillation amplitude is 35 mm to obtain the filament bundles. The filament bundles are then evenly laid on a web forming curtain to form a fiber web. The web forming machine process speed is controlled at 5 m / min, the pre-compression roller temperature is 100℃, and the suction air speed is 2 m / min. The fiber web is then needle-punched for reinforcement. The needle-punching machine needle density is controlled at 3000 needles / m, the needle-punching frequency is 800 times / min, the needle-punching stroke is 20 mm, the needle-punching depth is 3 mm, and the needle-punching density is 23 needles / cm². After the needle-punching is completed, the needle-punched semi-finished fabric is obtained.

[0030] (5) Hot rolling The needle-punched semi-finished fabric is heat-set at 150℃ for unit mesh. After the setting is completed, the set semi-finished fabric is placed in a hot rolling mill, and the temperature of the hot rolling roller is controlled at 180℃ and the pressure is 50 bar. After the hot rolling is completed, the hot-rolled base fabric is obtained.

[0031] (6) Impregnation A. Preparation of composite starch Polyethylene glycol diglycidyl ether and 3,3-dithiodipropionic acid dihydrazide were added to a container, and the container temperature was controlled at 55°C. The reaction was carried out under nitrogen for 1.5 hours. After the reaction was completed, a composite modifier was obtained. Corn starch was slowly added to deionized water while stirring. The stirring speed was controlled at 100 r / min. The container temperature was heated to 75°C while stirring was maintained. After the system became a uniform and transparent paste, it was kept at the temperature for another 30 minutes for gelatinization. After gelatinization, the paste was sieved to obtain a filtered starch paste. The filtered starch paste and catalyst were added to the composite modifier. The container temperature was controlled at 85°C and the reaction time was 3 hours. After the reaction was completed, the paste was washed, precipitated, filtered, and dried to obtain the composite starch. The catalyst is tetrabutylammonium bromide; The sieve used for sieving is 100 mesh; The mass ratio of polyethylene glycol diglycidyl ether to 3,3-dithiodipropionic acid dihydrazide is 1:1.5; The mass ratio of corn starch to deionized water is 10:45; The mass ratio of the filtered starch paste, catalyst, and composite modifier is 55:0.05:1.5.

[0032] B. Impregnation and drying Deionized water, composite starch, water-soluble polymer UV absorber and initiator are added to a reaction vessel and stirred evenly to obtain a composite adhesive. The temperature of the reaction vessel is raised to 65°C, and the hot-rolled base fabric is immersed in the composite adhesive for 30 minutes. After immersion, the base fabric is pre-dried by a rotary screen through-drying at a temperature of 120°C for 20 minutes. After pre-drying, the base fabric is dried by a rotary screen through-drying at a temperature of 190°C for 10 minutes. After drying, a high-strength, high-weather-resistant long-fiber polyester base fabric is obtained. The mass ratio of the deionized water, composite starch, water-soluble polymeric ultraviolet absorber, and initiator is 81:8:4:0.1. The water-soluble polymeric ultraviolet absorber is 2,4-dihydroxybenzophenone; The initiator is ammonium persulfate.

[0033] Example 3 A method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric includes the following steps: crystallization drying, melt extrusion, spinning and stretching, needle punching reinforcement, hot rolling, and impregnation.

[0034] (1) Crystallization and drying Fiber-grade semi-dull polyester chips were placed in a crystallization bed, and the equipment temperature was controlled at 185℃ for 20 minutes. After crystallization, the product was placed in a container and dried at 175℃ for 7 hours. After drying, dried polyester chips were obtained.

[0035] (2) Melt extrusion The dried polyester chips are mixed with weather-resistant additives and dispersants. After the mixture is evenly mixed, it is added to the extruder. The temperature of each heating zone of the screw extruder is controlled at 305℃. After extrusion, the extruded melt is filtered. The pressure of the filter instrument is controlled at 12Mpa. After filtration, the filtered melt is obtained. The weather-resistant additive is HALS; the dispersant is zinc stearate; The mass ratio of the dried polyester chips, weather-resistant additives, and dispersants is 85:1:2.

[0036] (3) Spinning and drawing The filtered melt is placed in a spinning machine and extruded through a spinneret to form nascent fiber filaments. The initial pressure of the spinning assembly is controlled at 25 MPa, the temperature of the heat transfer medium in the spinning system is controlled at 305℃, the nascent fiber is cooled by side blowing, the side blowing air temperature is controlled at 26℃, the relative humidity is 65%, the static pressure in the air duct is 600 Pa, and the air velocity is 0.8 m / s. The cooled nascent fiber is then stretched using an airflow stretching device, with the airflow stretching pressure controlled at 1.0 MPa. After stretching, the stretched filament bundle is obtained.

[0037] (4) Acupuncture reinforcement The drawn filament bundles are mechanically separated and placed into a filament oscillator. The oscillator frequency is controlled at 800 rpm and the oscillation amplitude is 65 mm to obtain the filament bundles. The filament bundles are then evenly laid on a web forming curtain to form a fiber web. The web forming machine process speed is controlled at 15 m / min, the pre-compression roller temperature is 160℃, and the suction air speed is 10 m / min. The fiber web is then needle-punched for reinforcement. The needle-punching machine needle density is controlled at 5000 needles / m, the needle-punching frequency is 1500 times / min, the needle-punching stroke is 40 mm, the needle-punching depth is 10 mm, and the needle-punching density is 36 needles / cm². After the needle-punching is completed, the needle-punched semi-finished fabric is obtained.

[0038] (5) Hot rolling The needle-punched semi-finished fabric is heat-set at 180℃ for unit mesh. After the setting is completed, the set semi-finished fabric is placed in a hot rolling mill, and the temperature of the hot rolling roller is controlled at 200℃ and the pressure is 60 bar. After the hot rolling is completed, the hot-rolled base fabric is obtained.

[0039] (6) Impregnation A. Preparation of composite starch Polyethylene glycol diglycidyl ether and 3,3-dithiodipropionic acid dihydrazide were added to a container, and the container temperature was controlled at 65°C. The reaction was carried out under nitrogen for 2 hours. After the reaction was completed, a composite modifier was obtained. Corn starch was slowly added to deionized water while stirring. The stirring speed was controlled at 120 r / min. The container temperature was heated to 85°C while stirring was maintained. After the system became a uniform and transparent paste, it was kept at the temperature for another 40 minutes for gelatinization. After gelatinization, the paste was sieved to obtain a filtered starch paste. The filtered starch paste and catalyst were added to the composite modifier. The container temperature was controlled at 95°C and the reaction time was 5 hours. After the reaction was completed, the paste was washed, precipitated, filtered, and dried to obtain the composite starch. The catalyst is tetrabutylammonium bromide; The sieve used for sieving is 100 mesh; The mass ratio of polyethylene glycol diglycidyl ether to 3,3-dithiodipropionic acid dihydrazide is 1:2.5; The mass ratio of corn starch to deionized water is 10:55; The mass ratio of the filtered starch paste, catalyst, and composite modifier is 65:0.05:2.

[0040] B. Impregnation and drying Deionized water, composite starch, water-soluble polymer UV absorber, and initiator were added to a reaction vessel and stirred until homogeneous to obtain a composite adhesive. The temperature of the reaction vessel was raised to 75°C, and the hot-rolled base fabric was immersed in the composite adhesive for 50 minutes. After immersion, the base fabric was pre-dried using a rotary screen through-drying method at a temperature of 160°C for 30 minutes. After pre-drying, the base fabric was dried using a rotary screen through-drying method at a temperature of 230°C for 20 minutes. After drying, a high-strength, high-weather-resistant long-fiber polyester base fabric was obtained. The mass ratio of the deionized water, composite starch, water-soluble polymeric ultraviolet absorber, and initiator is 88:12:6:0.3. The water-soluble polymeric ultraviolet absorber is 2,4-dihydroxybenzophenone; The initiator is ammonium persulfate.

[0041] Comparative Example 1 Comparative Example 1 uses the preparation method of high-strength and high-weather-resistant long-fiber polyester base fabric described in Example 1. The difference is that in the impregnation step, composite starch is not used, and ordinary starch is replaced in an equal amount with composite starch.

[0042] Test Example 1: Test on the bonding strength of the base fabric The high-strength, high-weather-resistant long-fiber polyester base fabrics prepared in Examples 1-3 and Comparative Example 1 were subjected to a base fabric bonding strength test. The test results are shown in Table 1. Table 1. Test results of the bonding strength of the base fabric

[0043] Test Example 2: Strength Performance Test of Base Fabric The high-strength, high-weather-resistant long-fiber polyester base fabrics prepared in Examples 1-3 and Comparative Example 1 were subjected to strength performance tests. The test results are shown in Table 2. Table 2 Test results of the strength performance of the base fabric

[0044] As can be seen from the test examples in the table, the high-strength and high-weather-resistant long-fiber polyester base fabrics prepared in Examples 1-3 have an adhesive creep of 0.30-0.35 mm, strong adhesion, strong bonding of the product, an elongation of 57-65%, a longitudinal tensile strength of 655-685 N / 5 cm, and a transverse tensile strength of 539-570 N / 5 cm. The base fabric has excellent mechanical properties, and the yellowing degree ΔYI in the ultraviolet aging test is 1.5-1.6, indicating strong weather resistance. In contrast, in Comparative Example 1, no composite starch was used in the impregnation step; ordinary starch was used instead, resulting in a base fabric with weak adhesion.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength, high-weather-resistant long-fiber polyester base fabric, characterized in that, The preparation method includes the following steps: crystallization drying, melt extrusion, spinning and drawing, needle punching reinforcement, hot rolling, and resin impregnation; The impregnation method includes preparing composite starch and impregnating and drying; The method for preparing the composite starch is as follows: polyethylene glycol diglycidyl ether and 3,3-dithiodipropionic acid dihydrazide are added to a container, the container temperature is controlled at 55-65℃, and the reaction is carried out under nitrogen for 1.5-2 hours. After the reaction is completed, a composite modifier is obtained. Corn starch is slowly added to deionized water while stirring, and the stirring speed is controlled at 100-120 r / min. The container temperature is heated to 75-85℃, and stirring is maintained during the process. After the system becomes a uniform and transparent paste, the temperature is kept high for 30-40 minutes for gelatinization. After gelatinization is completed, the mixture is sieved to obtain a filtered starch paste. The filtered starch paste and catalyst are added to the composite modifier, the container temperature is controlled at 85-95℃, and the reaction time is 3-5 hours. After the reaction is completed, the mixture is washed, precipitated, filtered, and dried to obtain the composite starch.

2. The method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric according to claim 1, characterized in that, The catalyst is tetrabutylammonium bromide; The sieve used for sieving is 100 mesh; The mass ratio of polyethylene glycol diglycidyl ether to 3,3-dithiodipropionic acid dihydrazide is 1:1.5-2.5; The mass ratio of corn starch to deionized water is 10:45-55; The mass ratio of the filtered starch paste, catalyst, and composite modifier is 55-65: 0.05：1.5-2。 3. The method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric according to claim 1, characterized in that, The crystallization drying method is as follows: fiber-grade semi-dull polyester chips are placed in a crystallization bed, the equipment temperature is controlled at 175-185℃, the crystallization time is 10-20 min, after crystallization, the product is placed in a container and dried at 165-175℃ for 5-7 h, and after drying, dried polyester chips are obtained.

4. The method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric according to claim 1, characterized in that, The melt extrusion method involves mixing dried polyester chips with weather-resistant additives and dispersants, mixing them evenly, and then adding the mixture to an extruder. The temperature of each heating zone of the screw extruder is controlled at 260-305℃. After extrusion, the extruded melt is filtered, and the pressure of the filter instrument is controlled at 6.5-12 MPa. After filtration, the filtered melt is obtained. The weather-resistant additive is HALS; the dispersant is zinc stearate; The mass ratio of the dried polyester chips, weather-resistant additives, and dispersants is 80-85: 0.5-1：1-2。 5. The method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric according to claim 1, characterized in that, The spinning and drawing method involves placing the filtered melt in a spinning machine and extruding it through a spinneret to form nascent fiber filaments. The initial pressure of the spinning assembly is controlled at 15-25 MPa, the temperature of the heat transfer medium in the spinning system is controlled at 280-305℃, the nascent fibers are cooled by side blowing air, and the side blowing air temperature is controlled at 18-26℃, the relative humidity is controlled at 60-65%, the static pressure in the air duct is controlled at 400-600 Pa, and the air velocity is controlled at 0.3-0.8 m / s. The cooled nascent fibers are then drawn using an airflow drawing device, and the airflow drawing pressure is controlled at 0.3-1.0 MPa. After drawing, the drawn filament bundle is obtained.

6. The method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric according to claim 1, characterized in that, The needle-punching reinforcement method involves mechanically separating the drawn filament bundles, placing the separated filament bundles into a filament oscillator, controlling the oscillator frequency at 400-800 n / min and the oscillation amplitude at 35-65 mm to obtain a filament bundle. The filament bundle is then evenly laid on a web forming curtain to form a fiber web. The web forming machine process speed is controlled at 5-15 m / min, the pre-pressing roller temperature at 100-160℃, and the suction wind speed at 2-10 m / min. The fiber web is then needle-punched for reinforcement, controlling the needle density of the needle punching machine at 3000-5000 needles / m, the needle punching frequency at 800-1500 times / min, the needle punching stroke at 20-40 mm, the needle punching depth at 3-10 mm, and the needle punching density at 23-36 needles / cm². After needle punching, a needle-punched semi-finished fabric is obtained.

7. The method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric according to claim 1, characterized in that, The hot rolling method involves heat-setting the needle-punched semi-finished fabric at 150-180℃ for unit mesh. After the setting is completed, the set semi-finished fabric is placed in a hot rolling mill, and the temperature of the hot rolling rollers is controlled at 180-200℃ and the pressure at 50-60 bar. After hot rolling, the hot-rolled base fabric is obtained.

8. The method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric according to claim 1, characterized in that, The impregnation and drying method is as follows: deionized water, composite starch, water-soluble polymeric ultraviolet absorber, and initiator are added to a reaction vessel and stirred evenly to obtain a composite adhesive. The temperature of the reaction vessel is raised to 65-75℃, and the hot-rolled base fabric is immersed in the composite adhesive for 30-50 minutes. After impregnation, the impregnated base fabric is pre-dried using a rotary screen through-drying method, with the pre-drying temperature controlled at 120-160℃ and the pre-drying time controlled at 20-30 minutes. After pre-drying, the base fabric is dried using a rotary screen through-drying method, with the drying temperature controlled at 190-230℃ and the drying time controlled at 10-20 minutes. After drying, a high-strength, high-weather-resistant long-fiber polyester base fabric is obtained.

9. The method for preparing a high-strength, high-weather-resistant long-fiber polyester base fabric according to claim 8, characterized in that, The mass ratio of the deionized water, composite starch, water-soluble polymeric ultraviolet absorber, and initiator is 81-88:8-12:4-6:0.1-0.

3. The water-soluble polymeric ultraviolet absorber is 2,4-dihydroxybenzophenone; The initiator is ammonium persulfate.

10. The high-strength, high-weather-resistant long-fiber polyester base fabric prepared by the method according to any one of claims 1-9.

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