A fixing wire for reinforcing a carton and a preparation method thereof

Abstract

The present invention relates to the technical field of polymer materials, and discloses a fixing wire for reinforcing a carton and a preparation method thereof. The fixing wire for reinforcing a carton prepared by the present invention adopts recycled polyester particles as the main raw material, and polyurethane and silicone resin are added for blending, thereby improving the comprehensive performance of the matrix; at the same time, a modified chain extender is added to improve the mechanical properties and heat resistance of the matrix; and the addition of reinforcing fillers can also synergize with the modified chain extender to further improve the mechanical properties of the matrix, and at the same time has a certain flame retardant effect.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a fixing wire for reinforcing a carton and a preparation method thereof. Background Art

[0002] The plastic fixing wire is a kind of industrial material specially used for carton reinforcement. It has many advantages such as light weight, strong, corrosion resistance and convenient use. Therefore, it quickly replaced the iron sheet and paper fixing wire after it came out and developed rapidly. With the development of the packaging industry, the demand for plastic fixing wire is increasing, and the production of plastic fixing wire will show a trend of doubling.

[0003] The materials commonly used for fixing wires on the market are polyethylene, polypropylene, steel wire, etc., but the tensile strength of fixing wires made of these materials is low. When subjected to a large external force impact, they may break due to their low strength. Therefore, they cannot adapt to impacts under higher strengths, otherwise they will break. The fixing wire synthesized with recycled polyester particles can not only save resources, but also has better comprehensive performance. Considering its application in the fixation of cartons, researchers need to develop a fixing wire with excellent mechanical properties, good heat resistance and good flame retardant properties. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a fixing wire for reinforcing a carton and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A fixing wire for reinforcing a carton, comprising the following raw materials in parts by weight: 70-100 parts of recycled polyester particles, 15-25 parts of polyurethane, 10-20 parts of reinforcing filler, 5-10 parts of modified chain extender, 3-6 parts of silicone resin, and 1-3 parts of antioxidant;

[0007] The reinforcing filler is prepared by the following steps:

[0008] Step A1, allylamine and sodium hydroxide are dispersed in acetone, recorded as solution 1; ethylenediamine and sodium hydroxide are dispersed in acetone, recorded as solution 2; cyanuric chloride is dispersed in acetone, slowly added to solution 1, transferred to an ice water bath for reaction for 2-3h, then heated to 40-50°C, half of solution 2 is added, stirring and reacting for 4-5h, then heated to 90°C, the remaining half of solution 2 is added, stirring and reacting for 6-8h, filtered and dried to obtain an intermediate product;

[0009] Step A2, the intermediate product and sodium hydroxide are uniformly dispersed in ethanol, and then 1,2,7,8-diepoxyoctane is added and stirred for 2-3 hours, and distilled under reduced pressure, filtered, washed and dried to obtain a functional monomer;

[0010] Step A3, dispersing the nanocellulose uniformly in N,N-dimethylformamide, then adding 4-bromo-1-butene and sodium hydroxide in sequence, stirring and reacting for 18-22 hours, centrifuging and purifying to obtain grafted modified cellulose;

[0011] Step A4, styrene, functional monomer and azobisisobutyronitrile are mixed and stirred in xylene to obtain a mixed solution; the grafted modified cellulose is dispersed in xylene and subjected to ultrasonic treatment for 10 minutes, and then the mixed solution is added and subjected to ultrasonic treatment for 10 minutes, and then transferred to a 65-75° C. oil bath pot, reacted for 10-12 hours under nitrogen conditions, centrifuged, washed and dried to obtain a reinforced filler;

[0012] Furthermore, in step A1, the dosage ratio of cyanuric chloride, acetone, solution 1, and solution 2 is 0.1-0.2 mol: 100 mL: 50 mL: 100 mL;

[0013] Further, in step A1, the ratio of allylamine, sodium hydroxide and acetone in solution 1 is 0.1-0.2 mol: 4-6 g: 50 mL, and the ratio of ethylenediamine, sodium hydroxide and acetone in solution 2 is 0.2-0.4 mol: 6-10 g: 100 mL;

[0014] Further, in step A2, the usage ratio of the intermediate product, sodium hydroxide, ethanol and 1,2,7,8-diepoxyoctane is 0.2-0.4 mol: 0.5-1.5 g: 100 mL: 0.22-0.45 mol;

[0015] Further, in step A3, the ratio of nanocellulose, N,N-dimethylformamide, 4-bromo-1-butene and sodium hydroxide is 1-3 g: 100 mL: 2-5 g: 1-3 g;

[0016] Further, in step A4, the amount ratio of grafted modified cellulose, xylene and mixed solution is 1-3 g: 50 mL: 50 mL;

[0017] Furthermore, the dosage ratio of styrene, functional monomer, azobisisobutyronitrile and xylene in the mixed solution of step A4 is 4-8 g: 1-3 g: 0.15-0.3 g: 50 mL.

[0018] The modified chain extender is prepared by the following steps:

[0019] Step B1, under nitrogen conditions, 4-vinylaniline is dispersed in N,N-dimethylformamide, and then the succinic anhydride solution is slowly added dropwise and stirred at room temperature for 24 hours, and then the above solution is poured into distilled water and allowed to stand for 1 hour, filtered and dried to obtain a terminal double bond product;

[0020] Step B2, under nitrogen conditions, add diethanolamine to methanol and disperse it evenly, add the terminal double bond product while stirring, and raise the temperature to 30-40°C at the same time, react for 3-5h, and rotary evaporate to obtain the modified chain extender;

[0021] Further, in step B1, the dosage ratio of 4-vinylaniline, N,N-dimethylformamide, succinic anhydride solution and distilled water is 0.01-0.03 mol:50 mL:50 mL:100 mL, and the succinic anhydride solution is prepared by mixing succinic anhydride and N,N-dimethylformamide in a dosage ratio of 0.01-0.03 mol:50 mL;

[0022] Furthermore, in step B2, the usage ratio of diethanolamine, methanol and terminal double bond product is 0.01-0.02 mol:50 mL:0.01-0.02 mol.

[0023] A method for preparing a fixing wire for reinforcing a carton comprises the following steps:

[0024] Weigh the raw materials by weight, add the recycled polyester particles, polyurethane, silicone resin and modified chain extender into a mixer, mix at 150-180°C for 30-60 minutes, then add reinforcing filler and antioxidant and mix evenly, extrude into a linear shape through a twin-screw extruder to obtain a fixed wire for carton reinforcement.

[0025] Beneficial effects of the present invention:

[0026] The fixing wire for reinforcing a carton prepared by the present invention adopts recycled polyester particles as a main raw material, and polyurethane and silicone resin are added for blending, thereby improving the comprehensive performance of the matrix; at the same time, a modified chain extender is added to improve the mechanical properties and heat resistance of the matrix; and the addition of reinforcing fillers can also synergize with the modified chain extender to further improve the mechanical properties of the matrix, and at the same time has a certain flame retardant effect.

[0027] In the modified chain extender, succinic anhydride is first reacted with 4-vinylaniline to generate a terminal double bond product, and then the double bonds in the terminal double bond product are reacted with the secondary amine in diethanolamine to obtain a modified chain extender containing hydroxyl groups; after the modified chain extender is introduced into the matrix, the mechanical properties of the matrix are improved, because the modified chain extender can react with the functional groups on the polyester chain to increase the molecular weight of the polyester, thereby improving its mechanical properties and enhancing the durability and impact resistance of the material; and the imide group introduced into the modified chain extender improves the heat resistance of the matrix.

[0028] In the reinforcing filler, allylamine, ethylenediamine and cyanuric chloride are first reacted to generate an intermediate product; then the amino group in the intermediate product is reacted with the epoxy group in 1,2,7,8-diepoxyoctane to generate a functional monomer containing a terminal epoxy structure; then the hydroxyl group on the surface of nanocellulose is reacted with the bromine atom in 4-bromo-1-butene to generate a grafted modified cellulose; then styrene and the functional monomer are used as raw materials to in-situ polymerize on the surface of the grafted modified cellulose to generate a coating layer to obtain the reinforcing filler. After the reinforcing filler is introduced into the matrix, it can use the epoxy group it contains to form a covalent bond with the end group of the polyester to anchor the nanocellulose in the polyester matrix, thereby improving the compatibility between the two and reducing the interaction between the nanocellulose particles; when the matrix is ​​subjected to external force, the reinforcing filler will produce stress concentration and shear yield, and the shear yield process can enable the matrix to absorb a large amount of energy when it breaks, and can hinder the expansion of the crack, thereby improving the toughness of the matrix; among them, the organic flexible coating layer on the surface of the reinforcing filler improves the dispersibility of the nanocellulose in the matrix, so that there is a certain activity between the nanocellulose and the polyester, thereby improving the mechanical properties of the matrix; in addition, the triazine structure contained in the reinforcing filler and the nanocellulose can work synergistically to improve the flame retardant properties of the matrix. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1: The reinforcing filler is prepared by the following steps:

[0031] Step A1, 0.1 mol of allylamine and 4 g of sodium hydroxide are dispersed in 50 mL of acetone, recorded as solution 1; 0.2 mol of ethylenediamine and 6 g of sodium hydroxide are dispersed in 100 mL of acetone, recorded as solution 2; 0.1 mol of cyanuric chloride is dispersed in 100 mL of acetone, 50 mL of solution 1 is slowly added, transferred to an ice water bath to react for 2 h, then heated to 40° C., 50 mL of solution 2 is added, stirring and reacting for 4 h, then heated to 90° C., the remaining 50 mL of solution 2 is added, stirring and reacting for 6 h, filtered and dried to obtain an intermediate product;

[0032] Step A2, 0.2 mol of the intermediate product and 0.5 g of sodium hydroxide are evenly dispersed in 100 mL of ethanol, and then 0.22 mol of 1,2,7,8-diepoxyoctane is added and stirred for 2 h, and the mixture is distilled under reduced pressure, filtered, washed and dried to obtain a functional monomer;

[0033] Step A3, dispersing 1 g of nanocellulose evenly in 100 mL of N,N-dimethylformamide, then adding 2 g of 4-bromo-1-butene and 1 g of sodium hydroxide in sequence, stirring and reacting for 18 h, centrifuging and purifying to obtain grafted modified cellulose;

[0034] Step A4, 4g styrene, 1g functional monomer and 0.15g azobisisobutyronitrile were mixed and stirred in 50mL xylene, which was recorded as a mixed solution; 1g grafted modified cellulose was dispersed in 50mL xylene and ultrasonicated for 10min, and then 50mL of the mixed solution was added and ultrasonicated for 10min, and then transferred to a 65°C oil bath, reacted for 10h under nitrogen conditions, centrifuged, washed and dried to obtain a reinforced filler.

[0035] The modified chain extender is prepared by the following steps:

[0036] Step B1, under nitrogen conditions, 0.01 mol of 4-vinylaniline was dispersed in 50 mL of N, N-dimethylformamide, and then 50 mL of succinic anhydride solution was slowly added dropwise, and stirred at room temperature for 24 hours, and then the above solution was poured into 100 mL of distilled water and allowed to stand for 1 hour, filtered and dried to obtain a terminal double bond product, and the succinic anhydride solution was prepared by mixing and stirring succinic anhydride and N, N-dimethylformamide in a dosage ratio of 0.01 mol: 50 mL;

[0037] Step B2, under nitrogen conditions, add 0.01 mol of diethanolamine to 50 mL of methanol and disperse evenly, add 0.01 mol of the terminal double bond product while stirring, and at the same time raise the temperature to 30°C, react for 3 hours, and rotary evaporate to obtain the modified chain extender.

[0038] Example 2: The reinforcing filler is prepared by the following steps:

[0039] Step A1, 0.15 mol of allylamine and 5 g of sodium hydroxide were dispersed in 50 mL of acetone, recorded as solution 1; 0.3 mol of ethylenediamine and 8 g of sodium hydroxide were dispersed in 100 mL of acetone, recorded as solution 2; 0.15 mol of cyanuric chloride was dispersed in 100 mL of acetone, 50 mL of solution 1 was slowly added, transferred to an ice water bath to react for 2.5 h, then heated to 45° C., 50 mL of solution 2 was added, stirring and reacting for 4.5 h, then heated to 90° C., the remaining 50 mL of solution 2 was added, stirring and reacting for 7 h, filtered and dried to obtain an intermediate product;

[0040] Step A2, 0.3 mol of the intermediate product and 1 g of sodium hydroxide are evenly dispersed in 100 mL of ethanol, and then 0.35 mol of 1,2,7,8-diepoxyoctane is added and stirred for 2.5 h, and the mixture is distilled under reduced pressure, filtered, washed and dried to obtain a functional monomer;

[0041] Step A3, 2 g of nanocellulose was evenly dispersed in 100 mL of N, N-dimethylformamide, and then 3.5 g of 4-bromo-1-butene and 2 g of sodium hydroxide were added in sequence, and the mixture was stirred for 20 h, centrifuged and purified to obtain grafted modified cellulose;

[0042] Step A4, 6g of styrene, 2g of functional monomer and 0.23g of azobisisobutyronitrile were mixed and stirred in 50mL of xylene, which was recorded as a mixed solution; 2g of grafted modified cellulose was dispersed in 50mL of xylene and ultrasonicated for 10min, and then 50mL of the mixed solution was added and ultrasonicated for 10min, and then transferred to a 70°C oil bath pot, reacted under nitrogen conditions for 11h, centrifuged, washed and dried to obtain a reinforced filler.

[0043] The modified chain extender is prepared by the following steps:

[0044] Step B1, under nitrogen conditions, 0.02 mol of 4-vinylaniline was dispersed in 50 mL of N, N-dimethylformamide, and then 50 mL of succinic anhydride solution was slowly added dropwise, and stirred at room temperature for 24 hours, and then the above solution was poured into 100 mL of distilled water and allowed to stand for 1 hour, filtered and dried to obtain a terminal double bond product, and the succinic anhydride solution was prepared by mixing succinic anhydride and N, N-dimethylformamide in a dosage ratio of 0.02 mol: 50 mL;

[0045] Step B2, under nitrogen conditions, add 0.015 mol of diethanolamine to 50 mL of methanol and disperse evenly, add 0.015 mol of the terminal double bond product while stirring, and at the same time raise the temperature to 35°C, react for 4 hours, and rotary evaporate to obtain the modified chain extender.

[0046] Example 3: The reinforcing filler is prepared by the following steps:

[0047] Step A1, 0.2 mol of allylamine and 6 g of sodium hydroxide are dispersed in 50 mL of acetone, recorded as solution 1; 0.4 mol of ethylenediamine and 10 g of sodium hydroxide are dispersed in 100 mL of acetone, recorded as solution 2; 0.2 mol of cyanuric chloride is dispersed in 100 mL of acetone, 50 mL of solution 1 is slowly added, transferred to an ice water bath to react for 3 h, then heated to 50° C., 50 mL of solution 2 is added, stirring and reacting for 5 h, then heated to 90° C., the remaining 50 mL of solution 2 is added, stirring and reacting for 8 h, filtered and dried to obtain an intermediate product;

[0048] Step A2, 0.4 mol of the intermediate product and 1.5 g of sodium hydroxide are evenly dispersed in 100 mL of ethanol, and then 0.45 mol of 1,2,7,8-diepoxyoctane is added and stirred for 3 h, and the mixture is distilled under reduced pressure, filtered, washed and dried to obtain a functional monomer;

[0049] Step A3, 3 g of nanocellulose was evenly dispersed in 100 mL of N, N-dimethylformamide, and then 5 g of 4-bromo-1-butene and 3 g of sodium hydroxide were added in sequence, stirred for reaction for 22 h, centrifuged and purified to obtain grafted modified cellulose;

[0050] Step A4, 8g of styrene, 3g of functional monomer and 0.3g of azobisisobutyronitrile were mixed and stirred in 50mL of xylene, which was recorded as a mixed solution; 3g of grafted modified cellulose was dispersed in 50mL of xylene and ultrasonicated for 10min, and then 50mL of the mixed solution was added and ultrasonicated for 10min, and then transferred to a 75°C oil bath pot, reacted for 12h under nitrogen conditions, centrifuged, washed and dried to obtain a reinforced filler.

[0051] The modified chain extender is prepared by the following steps:

[0052] Step B1, under nitrogen conditions, 0.03 mol of 4-vinylaniline was dispersed in 50 mL of N, N-dimethylformamide, and then 50 mL of succinic anhydride solution was slowly added dropwise, and stirred at room temperature for 24 hours, and then the above solution was poured into 100 mL of distilled water and allowed to stand for 1 hour, filtered and dried to obtain a terminal double bond product, and the succinic anhydride solution was prepared by mixing succinic anhydride and N, N-dimethylformamide in a dosage ratio of 0.03 mol: 50 mL;

[0053] Step B2, under nitrogen conditions, add 0.02 mol of diethanolamine to 50 mL of methanol and disperse evenly, add 0.02 mol of the terminal double bond product while stirring, and at the same time raise the temperature to 40°C, react for 5 hours, and rotary evaporate to obtain the modified chain extender.

[0054] Embodiment 4: A method for preparing a fixing wire for reinforcing a carton comprises the following steps:

[0055] 70 parts of recycled polyester particles, 15 parts of polyurethane, 10 parts of the reinforcing filler prepared in Example 1, 5 parts of the modified chain extender prepared in Example 1, 3 parts of silicone resin, and 1 part of antioxidant 1010;

[0056] The raw materials were weighed by weight, and the recycled polyester particles, polyurethane, silicone resin and the modified chain extender prepared in Example 1 were added into a mixer, mixed at 150° C. for 30 min, and then the reinforcing filler prepared in Example 1 and antioxidant 1010 were added and mixed evenly, and extruded into a linear shape through a twin-screw extruder to obtain a fixed wire for reinforcing a carton.

[0057] Embodiment 5: A method for preparing a fixing wire for reinforcing a carton comprises the following steps:

[0058] 80 parts of recycled polyester particles, 20 parts of polyurethane, 15 parts of the reinforcing filler prepared in Example 2, 8 parts of the modified chain extender prepared in Example 2, 4 parts of silicone resin, and 2 parts of antioxidant 1010;

[0059] The raw materials were weighed by weight, and the recycled polyester particles, polyurethane, silicone resin and the modified chain extender prepared in Example 2 were added into a mixer, mixed at 165° C. for 45 min, and then the reinforcing filler prepared in Example 2 and antioxidant 1010 were added and mixed evenly, and extruded into a linear shape through a twin-screw extruder to obtain a fixed wire for reinforcing a carton.

[0060] Embodiment 6: A method for preparing a fixing wire for reinforcing a carton comprises the following steps:

[0061] 100 parts of recycled polyester particles, 25 parts of polyurethane, 20 parts of the reinforcing filler prepared in Example 3, 10 parts of the modified chain extender prepared in Example 1, 6 parts of silicone resin, and 3 parts of antioxidant 1010;

[0062] The raw materials were weighed by weight, and the recycled polyester particles, polyurethane, silicone resin and the modified chain extender prepared in Example 3 were added into a mixer, mixed at 180° C. for 60 min, and then the reinforcing filler prepared in Example 3 and antioxidant 1010 were added and mixed evenly, and extruded into a linear shape through a twin-screw extruder to obtain a fixed wire for reinforcing a carton.

[0063] Comparative Example 1: This comparative example is a fixing wire for reinforcement. The difference from Example 6 is that magnesium hydroxide is used instead of the reinforcing filler prepared in Example 3, and the rest is the same.

[0064] Comparative Example 2: This comparative example is a fixing wire for reinforcement. The difference from Example 6 is that 1,4-butanediol is used instead of the modified chain extender prepared in Example 3, and the rest is the same.

[0065] The reinforcement fixing wires prepared in Examples 4-6 and Comparative Examples 1-2 were made into specifications with a width of 8 mm and a thickness of 0.5 mm, and the performance of the fixing wires was tested:

[0066] Tensile strength test: Use a plastic strapping tensile testing machine for testing;

[0067] Impact strength test: using a pointer-type cantilever beam impact strength tester for testing;

[0068] Breaking tensile strength test: Use the packing belt breaking tensile strength testing machine for testing;

[0069] Flame retardant performance test: The limiting oxygen index (LOI) is tested by slice layering in accordance with the national standard GB / T 2406.2-2009.

[0070] Heat deformation temperature test: Test according to GB1634-79 "Test method for heat deformation temperature of plastics under bending load (abbreviated as heat deformation temperature)";

[0071] The test results are shown in the following table:

[0072]

[0073] As can be seen from the above table, after the performance test, the tensile strength of the fixed wire prepared by the present invention is in the range of 373MPa-385MPa, and the impact strength is 19.3kJ / m 2 -19.9kJ / m 2 The tensile force at break is in the range of 3.3kN-3.9kN, the limiting oxygen index is in the range of 31%-34%, and the heat deformation temperature is in the range of 93.1℃-104.6℃, indicating that it has excellent mechanical properties, flame retardant properties and heat resistance.

[0074] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A fixing wire for reinforcing a carton, characterized in that: The invention comprises the following raw materials in parts by weight: 70-100 parts of recycled polyester particles, 15-25 parts of polyurethane, 10-20 parts of reinforcing filler, 5-10 parts of modified chain extender, 3-6 parts of silicone resin, and 1-3 parts of antioxidant; The reinforcing filler is prepared by the following steps: Step A1, allylamine and sodium hydroxide are dispersed in acetone, recorded as solution 1; ethylenediamine and sodium hydroxide are dispersed in acetone, recorded as solution 2; cyanuric chloride is dispersed in acetone, slowly added to solution 1, transferred to an ice water bath for reaction for 2-3h, then heated to 40-50°C, half of solution 2 is added, stirring and reacting for 4-5h, then heated to 90°C, the remaining half of solution 2 is added, stirring and reacting for 6-8h, filtered and dried to obtain an intermediate product; Step A2, the intermediate product and sodium hydroxide are uniformly dispersed in ethanol, and then 1,2,7,8-diepoxyoctane is added and stirred for 2-3 hours, and distilled under reduced pressure, filtered, washed and dried to obtain a functional monomer; Step A3, dispersing the nanocellulose uniformly in N,N-dimethylformamide, then adding 4-bromo-1-butene and sodium hydroxide in sequence, stirring and reacting for 18-22 hours, centrifuging and purifying to obtain grafted modified cellulose; Step A4, styrene, functional monomer and azobisisobutyronitrile are mixed and stirred in xylene to obtain a mixed solution; the grafted modified cellulose is dispersed in xylene and subjected to ultrasonic treatment for 10 minutes, and then the mixed solution is added and subjected to ultrasonic treatment for 10 minutes, and then transferred to a 65-75° C. oil bath pot, reacted for 10-12 hours under nitrogen conditions, centrifuged, washed and dried to obtain a reinforced filler; The modified chain extender is prepared by the following steps: Step B1, under nitrogen conditions, 4-vinylaniline is dispersed in N,N-dimethylformamide, and then the succinic anhydride solution is slowly added dropwise and stirred at room temperature for 24 hours, and then the above solution is poured into distilled water and allowed to stand for 1 hour, filtered and dried to obtain a terminal double bond product; Step B2: under nitrogen, add diethanolamine to methanol and disperse it evenly, add the terminal double bond product while stirring, and raise the temperature to 30-40° C., react for 3-5 hours, and rotary evaporate to obtain the modified chain extender.

2. A fixing wire for reinforcing a carton according to claim 1, characterized in that: Step A1: The dosage ratio of allylamine, sodium hydroxide and acetone in solution 1 is 0.1-0.2 mol: 4-6 g: 50 mL, and the dosage ratio of ethylenediamine, sodium hydroxide and acetone in solution 2 is 0.2-0.4 mol: 6-10 g: 100 mL.

3. A fixing wire for reinforcing a carton according to claim 1, characterized in that: In step A2, the usage ratio of the intermediate product, sodium hydroxide, ethanol and 1,2,7,8-diepoxyoctane is 0.2-0.4 mol: 0.5-1.5 g: 100 mL: 0.22-0.45 mol.

4. A fixing wire for reinforcing a carton according to claim 1, characterized in that: In step A3, the usage ratio of nanocellulose, N,N-dimethylformamide, 4-bromo-1-butene and sodium hydroxide is 1-3 g:100 mL:2-5 g:1-3 g.

5. A fixing wire for reinforcing a carton according to claim 1, characterized in that: In step A4, the amount ratio of grafted modified cellulose, xylene and mixed solution is 1-3g:50mL:50mL, and the amount ratio of styrene, functional monomer, azobisisobutyronitrile and xylene in the mixed solution is 4-8g:1-3g:0.15-0.3g:50mL.

6. A fixing wire for reinforcing a carton according to claim 1, characterized in that: In step B1, the dosage ratio of 4-vinylaniline, N,N-dimethylformamide, succinic anhydride solution and distilled water is 0.01-0.03 mol:50 mL:50 mL:100 mL, and the succinic anhydride solution is prepared by mixing succinic anhydride and N,N-dimethylformamide in a dosage ratio of 0.01-0.03 mol:50 mL.

7. A fixing wire for reinforcing a carton according to claim 1, characterized in that: In step B2, the usage ratio of diethanolamine, methanol and terminal double bond product is 0.01-0.02 mol:50 mL:0.01-0.02 mol.

8. A method for preparing the fixing wire for reinforcing a carton according to any one of claims 1 to 7, characterized in that: The following steps are involved: Weigh the raw materials by weight, add the recycled polyester particles, polyurethane, silicone resin and modified chain extender into a mixer, mix at 150-180°C for 30-60 minutes, then add reinforcing filler and antioxidant and mix evenly, extrude into a linear shape through a twin-screw extruder to obtain a fixed wire for carton reinforcement.

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