Preparation method of high-elasticity antibacterial trampoline net

Abstract

The invention discloses a preparation method of a high-elasticity antibacterial trampoline net, and relates to the technical field of fibers. According to the preparation method, firstly, 2-hydroxyethyl triethylenediamine reacts with guanidine hydrochloride to prepare polyhexamethylene guanidine with hydroxyl groups, the hydroxyl groups on the polyhexamethylene guanidine are combined with graphene quantum dots to prepare a composite filler, the composite filler is added into outer-layer fibers, and while the agglomeration phenomenon of the graphene quantum dots is reduced, the composite filler cooperates with the graphene quantum dots to physically cut bacteria and perform chemical action to resist bacteria at the same time; secondly, the trampoline net is formed by weaving double-layer fibers serving as raw materials; the outer layer is a three-dimensional network cross-linked structure syndiotactic polypropylene fiber added with sodium carboxymethyl cellulose, and has high elasticity and a binding site of the composite filler, so that the composite filler is stable and not easy to break; the inner-layer fiber is hard elastic modified polypropylene fiber, polypropylene is grafted with maleic anhydride and then is blended with nylon-11, the hard elastic performance of the inner-layer fiber is improved by improving technological parameters, and the inner-layer fiber serves as the inner-layer fiber to support the strength of a trampoline net. The trampoline net prepared by the invention has the effects of high elasticity and antibiosis.

Description

Technical Field

[0001] The invention relates to the field of fiber technology, in particular to a method for preparing a high-elasticity antibacterial trampoline net. Background Art

[0002] With the improvement of people's living standards and the enhancement of health awareness, the market demand for antibacterial materials has increased rapidly. Polypropylene is the main raw material for industrial textiles, and polypropylene products are distributed in all aspects of people's daily lives. It is of great practical significance to carry out antibacterial treatment on its fibers. The existing methods for preparing antibacterial fibers mainly focus on post-treatment of fibers, attaching or grafting inorganic substances to the fiber surface, and providing antibacterial active points. However, the significant defect of the above method is that the fiber fabric will inevitably peel off the antibacterial coating during the washing process, thereby reducing or even eliminating the antibacterial effect. Although organic antibacterial agents such as chemical antibacterial agents are easier to enter the resin through melt blending, avoiding the problem of elution, their decomposition temperature is low, and the high temperature process of polymer melt processing will cause the chemical to decompose, thereby reducing its antibacterial activity and destroying the product appearance.

[0003] As an emerging sport, trampoline has been widely promoted. Due to the high elasticity of the trampoline, the mesh used for the trampoline must have high elasticity, high strength and dimensional stability. The trampoline nets on the market have room for further improvement: as a sport, during the use of the trampoline, the sweat and feet of the participants make the trampoline net very easy to breed bacteria, thus causing unsafe factors. How to ensure the high elasticity of the trampoline net while having an antibacterial effect to ensure the safety of this sport is the research direction of the current invention. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a high-elastic antibacterial trampoline net to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for preparing a highly elastic antibacterial trampoline net, comprising the following preparation steps: (1) Guanidine hydrochloride and 2-hydroxyethyltriethylenediamine are added to a reaction kettle in proportion, and the temperature is raised to 100°C and maintained for 1 hour, 150°C and maintained for 2 hours, 200°C and maintained for 1 hour, and 250°C and maintained for 1 hour, and the temperature is gradually raised at a heating rate of 20°C / min; after the heating reaction is completed, 0.02 parts of a terminator based on the total mass of the reactants are added to terminate the reaction, and polyhexamethylene guanidine with hydroxyl groups is obtained; graphene quantum dots are added to ethanol, and stirred at 150 rpm for 20 minutes at 20 to 30°C to disperse them evenly, and then polyhexamethylene guanidine with hydroxyl groups is added, and the reaction is continued at 20 to 30°C for 12 to 36 hours. After the reaction is completed, the filter cake is filtered, and the obtained filter cake is washed twice with ethanol and dried at 50°C for 3 hours to obtain a composite filler; (2) Extruding syndiotactic polypropylene fiber and diisopropylbenzene peroxide in a twin-screw extruder, wherein the amount of diisopropylbenzene peroxide added is 1wt%, the extrusion temperature is 120-130°C, and granulating to obtain an initiator masterbatch; then, reacting and extruding the syndiotactic polypropylene fiber, the initiator masterbatch, and sodium carboxymethyl cellulose in a twin-screw extruder, wherein the extrusion temperature is 160-170°C, and granulating to obtain a cross-linked syndiotactic polypropylene fiber; finally, heating and stirring the cross-linked syndiotactic polypropylene fiber and the composite filler at a mass ratio of 50:1-2 at a high temperature, the temperature is 150-160°C, the stirring speed is 250rpm, and the time is 20min. After the stirring is completed, an outer layer fiber material is obtained; (3) Melt maleic anhydride, benzoyl peroxide and grafting monomer at 50°C, stir at 200 rpm for 10 min to form a mixed liquid; mix the weighed 2085GW polypropylene and the mixed liquid at a mass ratio of 10:0.5-0.9 at 165°C, stir at 60 rpm for 10 min to graft, then add the modified polypropylene and nylon-11 into the extruder, extrude and granulate at 170°C to obtain the inner layer fiber material; (4) The inner layer fiber material and the outer layer fiber material are used as raw materials, melted and metered, and the two-component fiber with skin-core structure is sprayed out from the fine holes of the composite spinneret assembly, and then cooled by blowing air at a temperature of 20°C and a speed of 0.8 cm / s. Then, it is annealed at 120°C for 1 hour, and then cooled to 110°C for a second annealing treatment for 2 hours. Then, it is oiled, bundled, pulled, and fed into a wire barrel. After balancing, the filaments are sent to subsequent stretching, curling, drying and other stages to prepare double-layer fibers, and then woven to make a trampoline net.

[0006] Furthermore, in step (1), the mass ratio of guanidine hydrochloride to 2-hydroxyethyltriethylenediamine is 1:1.2-1.6.

[0007] Furthermore, the terminator in step (1) is polyvinyl alcohol.

[0008] Furthermore, in step (1), the molar ratio of graphene quantum dots, ethanol, and hydroxyl-bearing polyhexamethylene guanidine is 1:10:1-2.

[0009] Furthermore, in the step (2), the mass ratio of the intermediate regular polypropylene fiber, the initiator masterbatch, and the sodium carboxymethyl cellulose is 1:1:0.1-0.15.

[0010] Furthermore, in step (3), the mass ratio of maleic anhydride, benzoyl peroxide and grafting aid monomer is 1:8-12:0.1-0.2.

[0011] Furthermore, in step (3), the auxiliary grafting monomer is triallyl isocyanurate.

[0012] Furthermore, in step (3), the mass ratio of modified polypropylene to nylon-11 is 15:0.2-0.4.

[0013] Furthermore, in step (4), the mass ratio of the inner layer fiber material to the outer layer fiber material is 1:1-2.

[0014] Furthermore, in step (4), the melting temperature of the inner layer fiber material is 160°C, and the melting temperature of the outer layer fiber material is 180°C.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: The invention uses syndiotactic polypropylene fiber with composite filler as the outer layer and hard elastic modified polypropylene fiber as the inner layer to prepare a double-layer fiber weaving into a trampoline net to achieve high elasticity and antibacterial effects.

[0016] Firstly, the present invention uses 2-hydroxyethyltriethylenediamine and guanidine hydrochloride to react to prepare hydroxyl-bearing polyhexamethyleneguanidine, which is then combined with graphene quantum dots to prepare a composite filler, which is added into an outer fiber layer; polyhexamethyleneguanidine can generate ionization in an aqueous solution such as sweat, and when a user drips sweat on a trampoline, its hydrophilic group part contains strong positive charge, which adsorbs various bacteria and viruses that are usually negatively charged, enters the cell membrane, inhibits the synthesis of liposomes in the membrane, causes bacterial apoptosis, and thus achieves an antibacterial effect; the hydroxyl groups on the polyhexamethyleneguanidine are combined with graphene quantum dots to reduce the aggregation of graphene quantum dots, and cooperate with the graphene quantum dots to physically cut bacteria and chemically act to achieve antibacterial effect; Secondly, the trampoline net is woven with double-layer fibers as raw materials; the outer layer is syndiotactic polypropylene fiber with added composite fillers, to which sodium carboxymethyl cellulose is added to form a three-dimensional network cross-linking structure. This three-dimensional network structure can improve the elastic elongation at break of syndiotactic polypropylene fiber, and also provide binding sites for the composite filler, making the outer fiber more stable and less likely to break; the inner fiber is hard elastic modified polypropylene fiber, which is made by grafting maleic anhydride with polypropylene and then blending it with nylon-11. Its hard elastic performance is improved by adding and improving the process parameters of air cooling and two-stage annealing, while taking into account compatibility to ensure elasticity. The hard elastic modified polypropylene fiber has similar elasticity to syndiotactic polypropylene fiber, and also has better strength than it. As the inner fiber, it supports the strength of the trampoline net. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of a high elastic antibacterial trampoline net made in the following examples as follows: Elasticity: The size of the trampoline nets prepared in the examples and comparative examples was limited to 10 cm*10 cm*0.2 cm, and the tensile strength and elongation at break were measured according to the American ASTM D 412 standard; Antibacterial: The size of the trampoline nets prepared in the examples and comparative examples was limited to 10cm*10cm*0.2cm, and with reference to GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", Staphylococcus aureus and Escherichia coli were selected as bacterial species.

[0019] Example 1; (1) Guanidine hydrochloride and 2-hydroxyethyltriethylenediamine are added to a reactor in a mass ratio of 1:1.2, and the temperature is raised to 100°C for 1 hour, 150°C for 2 hours, 200°C for 1 hour, and 250°C for 1 hour, and the temperature is gradually raised at a heating rate of 20°C / min; after the heating reaction is completed, 0.02 parts of polyvinyl alcohol based on the total mass of the reactants are added to terminate the reaction to obtain hydroxyl-containing polyhexamethylene guanidine; graphene quantum dots are added to ethanol, stirred at 150 rpm for 20 minutes at 20°C to disperse evenly, and then hydroxyl-containing polyhexamethylene guanidine is added, the molar ratio of graphene quantum dots, ethanol, and hydroxyl-containing polyhexamethylene guanidine is 1:10:1, and the reaction is continued at 20°C for 12 hours. After the reaction is completed, the filter is filtered, and the obtained filter cake is washed twice with ethanol and dried at 50°C for 3 hours to obtain a composite filler; (2) Extruding syndiotactic polypropylene fiber and diisopropylbenzene peroxide in a twin-screw extruder, wherein the addition amount of diisopropylbenzene peroxide is 1wt%, the extrusion temperature is 120°C, and granulation is performed to obtain an initiator masterbatch; then, the syndiotactic polypropylene fiber, the initiator masterbatch, and sodium carboxymethyl cellulose are reacted and extruded together in a twin-screw extruder in a mass ratio of 1:1:0.1, and the extrusion temperature is 160°C, and granulation is performed to obtain cross-linked syndiotactic polypropylene fiber; finally, the cross-linked syndiotactic polypropylene fiber and the composite filler are heated and stirred at a mass ratio of 50:1 at a high temperature, the temperature is 150°C, the stirring speed is 250 rpm, and the time is 20 min. After the stirring is completed, the outer layer fiber material is obtained; (3) Maleic anhydride, benzoyl peroxide and triallyl isocyanurate were melted at 50°C, with the mass ratio of maleic anhydride, benzoyl peroxide and grafting monomer being 1:8:0.1, and stirred at 200 rpm for 10 min to form a mixed liquid; the weighed 2085GW polypropylene and the mixed liquid were mixed at a mass ratio of 10:0.5 at 165°C, and stirred at 60 rpm for 10 min for grafting, and then the modified polypropylene and nylon-11 were added to the extruder at a mass ratio of 15:0.2, and extruded and granulated at 170°C to obtain the inner layer fiber material; (4) An inner layer fiber material and an outer layer fiber material are used as raw materials, the inner layer fiber material is melted at a melting temperature of 160°C and the outer layer fiber material is melted at a melting temperature of 180°C, and the mass ratio of the inner layer fiber material to the outer layer fiber material is 1:1, and a two-component fiber with a core-skin structure is sprayed out from the fine holes of a composite spinneret assembly, and then cooled by blowing air at a temperature of 20°C and a speed of 0.8 cm / s, and then annealed at 120°C for 1 hour, and then cooled to 110°C for a second annealing treatment for 2 hours; then, the fiber is oiled, bundled, pulled, and fed into a wire barrel, and after balancing, the fiber strips are sent to subsequent stretching, curling, drying and other stages to be prepared into a double-layer fiber, and then woven to obtain a trampoline net.

[0020] Example 2; (1) Guanidine hydrochloride and 2-hydroxyethyltriethylenediamine are added to a reactor in a mass ratio of 1:1.4, and the temperature is raised to 100°C for 1 hour, 150°C for 2 hours, 200°C for 1 hour, and 250°C for 1 hour, and the temperature is gradually raised at a heating rate of 20°C / min; after the heating reaction is completed, 0.02 parts of polyvinyl alcohol based on the total mass of the reactants are added to terminate the reaction to obtain hydroxyl-containing polyhexamethylene guanidine; graphene quantum dots are added to ethanol, stirred at 150 rpm for 20 minutes at 25°C to disperse evenly, and then hydroxyl-containing polyhexamethylene guanidine is added, the molar ratio of graphene quantum dots, ethanol, and hydroxyl-containing polyhexamethylene guanidine is 1:10:1.5, and the reaction is continued at 25°C for 24 hours. After the reaction is completed, the filter is filtered, and the obtained filter cake is washed twice with ethanol and dried at 50°C for 3 hours to obtain a composite filler; (2) Extruding syndiotactic polypropylene fiber and diisopropylbenzene peroxide in a twin-screw extruder, wherein the amount of diisopropylbenzene peroxide added is 1 wt%, the extrusion temperature is 125°C, and granulation is performed to obtain an initiator masterbatch; then, the syndiotactic polypropylene fiber, the initiator masterbatch, and sodium carboxymethyl cellulose are reacted and extruded together in a twin-screw extruder in a mass ratio of 1:1:0.125, and the extrusion temperature is 165°C, and granulation is performed to obtain cross-linked syndiotactic polypropylene fiber; finally, the cross-linked syndiotactic polypropylene fiber and the composite filler are heated and stirred at a mass ratio of 50:1.5 at a high temperature, the temperature is 155°C, the stirring speed is 250 rpm, and the time is 20 min. After the stirring is completed, the outer layer fiber material is obtained; (3) Maleic anhydride, benzoyl peroxide and triallyl isocyanurate were melted at 50°C, with the mass ratio of maleic anhydride, benzoyl peroxide and grafting monomer being 1:10:0.15, and stirred at 200 rpm for 10 min to form a mixed liquid; the weighed 2085GW polypropylene and the mixed liquid were mixed at a mass ratio of 10:0.7 at 165°C, and stirred at 60 rpm for 10 min for grafting, and then the modified polypropylene and nylon-11 were added to the extruder at a mass ratio of 15:0.3, and extruded and granulated at 170°C to obtain the inner layer fiber material; (4) An inner layer fiber material and an outer layer fiber material are used as raw materials, the inner layer fiber material is melted at a melting temperature of 160°C and the outer layer fiber material is melted at a melting temperature of 180°C, and the mass ratio of the inner layer fiber material to the outer layer fiber material is 1:1.5, and a two-component fiber with a core-skin structure is sprayed out from the fine holes of a composite spinneret assembly, and then cooled by blowing air at a temperature of 20°C and a speed of 0.8 cm / s, and then annealed at 120°C for 1 hour, and then cooled to 110°C for a second annealing treatment for 2 hours; then, the fiber is oiled, bundled, pulled, and fed into a wire barrel, and after balancing, the fiber strips are sent to subsequent stretching, curling, drying and other stages to be prepared into a double-layer fiber, and then woven to obtain a trampoline net.

[0021] Example 3; (1) Guanidine hydrochloride and 2-hydroxyethyltriethylenediamine are added to a reactor in a mass ratio of 1:1.6, and the temperature is raised to 100°C for 1 hour, 150°C for 2 hours, 200°C for 1 hour, and 250°C for 1 hour, and the temperature is gradually raised at a heating rate of 20°C / min; after the heating reaction is completed, 0.02 parts of polyvinyl alcohol based on the total mass of the reactants are added to terminate the reaction to obtain hydroxyl-containing polyhexamethylene guanidine; graphene quantum dots are added to ethanol, stirred at 150 rpm for 20 minutes at 30°C to disperse evenly, and then hydroxyl-containing polyhexamethylene guanidine is added, the molar ratio of graphene quantum dots, ethanol, and hydroxyl-containing polyhexamethylene guanidine is 1:10:2, and the reaction is continued at 30°C for 36 hours. After the reaction is completed, the filter is filtered, and the obtained filter cake is washed twice with ethanol and dried at 50°C for 3 hours to obtain a composite filler; (2) Extruding syndiotactic polypropylene fiber and diisopropylbenzene peroxide in a twin-screw extruder, wherein the amount of diisopropylbenzene peroxide added is 1wt%, the extrusion temperature is 130°C, and granulation is performed to obtain an initiator masterbatch; then, the syndiotactic polypropylene fiber, the initiator masterbatch, and sodium carboxymethyl cellulose are reacted and extruded together in a twin-screw extruder in a mass ratio of 1:1:0.15, and the extrusion temperature is 170°C, and granulation is performed to obtain cross-linked syndiotactic polypropylene fiber; finally, the cross-linked syndiotactic polypropylene fiber and the composite filler are heated and stirred at a mass ratio of 50:2 at a high temperature, the temperature is 160°C, the stirring speed is 250rpm, and the time is 20min. After the stirring is completed, the outer layer fiber material is obtained; (3) Maleic anhydride, benzoyl peroxide and triallyl isocyanurate were melted at 50°C, with the mass ratio of maleic anhydride, benzoyl peroxide and grafting monomer being 1:12:0.2, and stirred at 200 rpm for 10 min to form a mixed liquid; the weighed 2085GW polypropylene and the mixed liquid were mixed at a mass ratio of 10:0.9 at 165°C, and stirred at 60 rpm for 10 min for grafting, and then the modified polypropylene and nylon-11 were added to the extruder at a mass ratio of 15:0.4, and extruded and granulated at 170°C to obtain the inner layer fiber material; (4) An inner layer fiber material and an outer layer fiber material are used as raw materials, the inner layer fiber material is melted at a melting temperature of 160°C and the outer layer fiber material is melted at a melting temperature of 180°C, and the mass ratio of the inner layer fiber material to the outer layer fiber material is 1:2, and a two-component fiber with a core-skin structure is sprayed out from the fine holes of a composite spinneret assembly, and then cooled by blowing air at a temperature of 20°C and a speed of 0.8 cm / s, and then annealed at 120°C for 1 hour, and then cooled to 110°C for a second annealing treatment for 2 hours; then, the fiber is oiled, bundled, pulled, and fed into a wire barrel, and after balancing, the fiber strips are sent to subsequent stretching, curling, drying and other stages to be prepared into a double-layer fiber, and then woven to obtain a trampoline net.

[0022] Comparative Example 1: The difference between Comparative Example 1 and Example 2 is that step (1) is omitted, and step (2) is changed to: extrude syndiotactic polypropylene fibers and diisopropylbenzene peroxide in a twin-screw extruder, the added amount of diisopropylbenzene peroxide is 1wt%, the extrusion temperature is 125°C, and granulation is performed to obtain an initiator masterbatch; then, the syndiotactic polypropylene fibers, the initiator masterbatch, and sodium carboxymethyl cellulose are reacted and extruded together in a twin-screw extruder in a mass ratio of 1:1:0.125, the extrusion temperature is 165°C, and granulation is performed to obtain cross-linked syndiotactic polypropylene fibers; finally, the cross-linked syndiotactic polypropylene fibers and graphene quantum dots are heated and stirred at a mass ratio of 50:1.5 at a high temperature, the temperature is 155°C, the stirring speed is 250rpm, the time is 20min, and the stirring is completed to obtain an outer fiber; the remaining steps are the same as those in Example 2.

[0023] Comparative Example 2: The difference between Comparative Example 2 and Example 2 is that step (1) is different, and step (1) is changed to: guanidine hydrochloride and triethylenediamine are added to a reactor in a mass ratio of 1:1.4, and the temperature is raised to 100°C and maintained for 1 hour, 150°C and maintained for 2 hours, 200°C and maintained for 1 hour, and 250°C and maintained for 1 hour, and the temperature is gradually raised at a heating rate of 20°C / min; after the heating reaction is completed, 0.02 parts of polyvinyl alcohol based on the total mass of the reactants are added to terminate the reaction to obtain polyhexamethylene guanidine; graphene quantum dots are added to ethanol, stirred at 150 rpm for 20 minutes at 25°C to disperse evenly, and then polyhexamethylene guanidine is added, the molar ratio of graphene quantum dots, ethanol, and polyhexamethylene guanidine is 1:10:1.5, and the reaction is continued at 25°C for 24 hours. After the reaction is completed, the filter is filtered, and the obtained filter cake is washed twice with ethanol and dried at 50°C for 3 hours to obtain a composite filler; the remaining steps are the same as those in Example 2.

[0024] Comparative Example 3: The difference between Comparative Example 3 and Example 2 is that steps (1) (2) are different, and steps (1) (2) are changed to: (1) Guanidine hydrochloride and 2-hydroxyethyltriethylenediamine are added to a reaction kettle at a mass ratio of 1:1.4, and the temperature is raised to 100°C for 1 hour, 150°C for 2 hours, 200°C for 1 hour, and 250°C for 1 hour, and the temperature is gradually raised at a heating rate of 20°C / min; after the heating reaction is completed, 0.02 parts of polyvinyl alcohol based on the total mass of the reactants is added to terminate the reaction, and polyhexamethylene guanidine with hydroxyl groups is obtained; (2) Extruding syndiotactic polypropylene fiber and diisopropylbenzene peroxide in a twin-screw extruder, wherein the added amount of diisopropylbenzene peroxide is 1 wt %, the extrusion temperature is 125° C., and granulating to obtain an initiator masterbatch; then, reacting and extruding the syndiotactic polypropylene fiber, the initiator masterbatch, and sodium carboxymethyl cellulose in a mass ratio of 1:1:0.125 in a twin-screw extruder, and the extrusion temperature is 165° C., and granulating to obtain cross-linked syndiotactic polypropylene fiber; finally, heating and stirring the cross-linked syndiotactic polypropylene fiber and hydroxyl-containing polyhexamethylene guanidine in a mass ratio of 50:1.5 at high temperature, the temperature is 155° C., the stirring speed is 250 rpm, and the time is 20 min. After stirring, the outer fiber material is obtained; the remaining steps are the same as those in Example 2.

[0025] Comparative Example 4: The difference between Comparative Example 4 and Example 2 is that step (2) is different. Step (2) is changed to: the syndiotactic polypropylene fiber and the composite filler are heated and stirred at a mass ratio of 50:1.5 at a high temperature, the temperature is 155°C, the stirring speed is 250 rpm, the time is 20 min, and the outer layer fiber material is obtained after the stirring is completed; the remaining steps are the same as Example 2.

[0026] Comparative Example 5: The difference between Comparative Example 5 and Example 2 is that step (4) is different. Step (4) is changed to: using inner layer fiber material and outer layer fiber material as raw materials, melting the inner layer fiber material at a melting temperature of 160°C and the outer layer fiber material at a melting temperature of 180°C, and measuring the inner layer fiber material to the outer layer fiber material at a mass ratio of 1:1.5, spraying out a two-component fiber of a skin-core structure from the fine holes of the composite spinneret assembly, cooling by air cooling at a temperature of 30°C and a speed of 0.5 cm / s, and then oiling, bundling, pulling, and feeding into a wire drum. After balancing, the filaments are sent to subsequent stretching, curling, drying and other stages to prepare a double-layer fiber, and then weaving to obtain a trampoline net; the remaining steps are the same as Example 2.

[0027] Effect example Table 1 below shows the performance analysis results of a high elastic antibacterial trampoline net using Examples 1 to 3 of the present invention and Comparative Examples 1 to 5.

[0028] Table 1

[0029] From the comparison of the experimental data of the antibacterial property of the embodiment and the comparative example, it can be found that the present invention uses 2-hydroxyethyltriethylenediamine and guanidine hydrochloride to react to prepare hydroxyl-bearing polyhexamethyleneguanidine, which is then combined with graphene quantum dots to prepare a composite filler and added to the outer fiber; polyhexamethyleneguanidine can produce ionization in an aqueous solution such as sweat. When the user sweats on the trampoline, its hydrophilic group contains a strong positive charge, which adsorbs various bacteria and viruses that are usually negatively charged, enters the cell membrane, inhibits the synthesis of liposomes in the membrane, and causes bacterial apoptosis, thereby achieving an antibacterial effect; the hydroxyl groups on the polyhexamethyleneguanidine are combined with graphene quantum dots to reduce the aggregation of graphene quantum dots, and cooperate with the graphene quantum dots to physically cut bacteria and chemically act simultaneously to achieve antibacterial effect. From the comparison of the elastic experimental data of the embodiment and the comparative example, it can be found that the trampoline net fiber prepared by the present invention is a double-layer fiber, the outer layer is a syndiotactic polypropylene fiber with a composite filler added, wherein sodium carboxymethyl cellulose is added to form a three-dimensional mesh cross-linked structure, and this three-dimensional mesh structure can improve the elastic elongation at break of the syndiotactic polypropylene fiber, and also provides a binding site for the composite filler, making the outer layer fiber more stable and not easy to break. The inner layer fiber is a hard elastic modified polypropylene fiber, which is blended with nylon-11 after grafting maleic anhydride with polypropylene, and its hard elastic performance is improved by adding and improving the process parameters of air cooling and two-stage annealing. The hard elastic modified polypropylene fiber has similar elasticity to the syndiotactic polypropylene fiber, and also has better strength than it, and as the inner layer fiber, it supports the strength of the trampoline net.

[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a high elastic antibacterial trampoline net, characterized in that: The method comprises the following preparation steps: (1) Guanidine hydrochloride and 2-hydroxyethyltriethylenediamine are added to a reaction kettle in proportion, and the temperature is raised to 100°C and maintained for 1 hour, 150°C and maintained for 2 hours, 200°C and maintained for 1 hour, and 250°C and maintained for 1 hour, and the temperature is gradually raised at a heating rate of 20°C / min; after the heating reaction is completed, 0.02 parts of a terminator based on the total mass of the reactants are added to terminate the reaction, and polyhexamethylene guanidine with hydroxyl groups is obtained; graphene quantum dots are added to ethanol, and stirred at 150 rpm for 20 minutes at 20 to 30°C to disperse them evenly, and then polyhexamethylene guanidine with hydroxyl groups is added, and the reaction is continued at 20 to 30°C for 12 to 36 hours. After the reaction is completed, the filter cake is filtered, and the obtained filter cake is washed twice with ethanol and dried at 50°C for 3 hours to obtain a composite filler; (2) Extruding syndiotactic polypropylene fiber and diisopropylbenzene peroxide in a twin-screw extruder, wherein the amount of diisopropylbenzene peroxide added is 1wt%, the extrusion temperature is 120-130°C, and granulating to obtain an initiator masterbatch; then, reacting and extruding the syndiotactic polypropylene fiber, the initiator masterbatch, and sodium carboxymethyl cellulose in a twin-screw extruder, wherein the extrusion temperature is 160-170°C, and granulating to obtain a cross-linked syndiotactic polypropylene fiber; finally, heating and stirring the cross-linked syndiotactic polypropylene fiber and the composite filler at a mass ratio of 50:1-2 at a high temperature, the temperature is 150-160°C, the stirring speed is 250rpm, and the time is 20min. After the stirring is completed, an outer layer fiber material is obtained; (3) Melt maleic anhydride, benzoyl peroxide and grafting monomer at 50°C, stir at 200 rpm for 10 min to form a mixed liquid; mix the weighed 2085GW polypropylene and the mixed liquid at a mass ratio of 10:0.5-0.9 at 165°C, stir at 60 rpm for 10 min to graft, then add the modified polypropylene and nylon-11 into the extruder, extrude and granulate at 170°C to obtain the inner layer fiber material; (4) The inner layer fiber material and the outer layer fiber material are used as raw materials, melted and metered, and the two-component fiber with skin-core structure is sprayed out from the fine holes of the composite spinneret assembly, and then cooled by blowing air at a temperature of 20°C and a speed of 0.8 cm / s. Then, it is annealed at 120°C for 1 hour, and then cooled to 110°C for a second annealing treatment for 2 hours. Then, it is oiled, bundled, pulled, and fed into a wire barrel. After balancing, the filaments are sent to subsequent stretching, curling, drying and other stages to prepare double-layer fibers, and then woven to make a trampoline net.

2. The method for preparing a high elastic antibacterial trampoline net according to claim 1, characterized in that: In the step (1), the mass ratio of guanidine hydrochloride to 2-hydroxyethyltriethylenediamine is 1:1.2-1.

6.

3. The method for preparing a high elastic antibacterial trampoline net according to claim 1, characterized in that: The terminating agent in step (1) is polyvinyl alcohol.

4. The method for preparing a high elastic antibacterial trampoline net according to claim 1, characterized in that: In the step (1), the molar ratio of graphene quantum dots, ethanol and hydroxyl-bearing polyhexamethylene guanidine is 1:10:1-2.

5. The method for preparing a high elastic antibacterial trampoline net according to claim 1, characterized in that: In the step (2), the mass ratio of the intermediate regular polypropylene fiber, the initiator masterbatch, and the sodium carboxymethyl cellulose is 1:1:0.1-0.

15.

6. The method for preparing a high elastic antibacterial trampoline net according to claim 1, characterized in that: In the step (3), the mass ratio of maleic anhydride, benzoyl peroxide and auxiliary grafting monomer is 1:8-12:0.1-0.

2.

7. The method for preparing a high elastic antibacterial trampoline net according to claim 1, characterized in that: In the step (3), the grafting aid monomer is triallyl isocyanurate.

8. The method for preparing a high elastic antibacterial trampoline net according to claim 1, characterized in that: In the step (3), the mass ratio of modified polypropylene to nylon-11 is 15:0.2-0.

4.

9. The method for preparing a high elastic antibacterial trampoline net according to claim 1, characterized in that: In the step (4), the mass ratio of the inner layer fiber material to the outer layer fiber material is 1:1-2.

10. The method for preparing a high elastic antibacterial trampoline net according to claim 1, characterized in that: In the step (4), the melting temperature of the inner layer fiber material is 160°C, and the melting temperature of the outer layer fiber material is 180°C.

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