Artificial grass silk with self-repairing function and preparation method and application thereof

Abstract

The invention discloses an artificial grass yarn with a self-repairing function and a preparation method and application thereof.The artificial grass yarn is prepared from, by weight, 75-95 parts of linear low-density polyethylene, 5-25 parts of linear high-density polyethylene, 3-6 parts of color master batch, 3-6 parts of reversible cross-linked polymer, 1-3 parts of initiator, 2-5 parts of anti-aging additive and 1-3 parts of processing additive, the mass of the reversible cross-linked polymer accounts for 2-6% of the total mass of the artificial grass, and the mass ratio of the reversible cross-linked polymer to the initiator is 2: 1. After the interior of the material is damaged, the material can be self-repaired, and the service life of the material is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of artificial turf yarns, and in particular relates to artificial turf yarns with a self-repairing function, a preparation method and an application thereof. Background Art

[0002] Artificial turf has the advantages of high frequency use all year round and all-weather, as well as low cost and convenient maintenance. It is widely used in various sports, fitness and leisure places. For example, artificial turf is often used in football fields, tennis courts, hockey fields, golf courses, comprehensive sports fields, amusement parks, kindergartens, residential courtyards, parks and other places. Artificial grass is the core material of artificial turf. At present, the main raw materials of artificial turf are polyethylene, polypropylene, etc. These materials have excellent physical, chemical and mechanical properties, such as light weight, good corrosion resistance, and convenient molding. However, the surface hardness of polymers is low, the bearing capacity is poor, and they are easy to wear. In addition, artificial turf is frequently used and has a large degree of wear. Artificial grass is inevitably damaged, and microcracks will appear on its surface during long-term use, which affects the service life of artificial turf. The present invention is intended to provide an artificial grass with self-repairing ability to extend the service life of artificial turf. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide an artificial grass yarn with self-repairing function and a preparation method and application, so that the material can self-repair after damage occurs inside, thereby extending the service life of the material.

[0004] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0005] The present invention provides an artificial turf yarn with a self-repairing function. The artificial turf yarn comprises, by weight, 75 to 95 parts of linear low-density polyethylene, 5 to 25 parts of linear high-density polyethylene, 3 to 6 parts of masterbatch, 3 to 6 parts of reversibly cross-linked polymer, 1 to 3 parts of initiator, 2 to 5 parts of anti-aging aid and 1 to 3 parts of processing aid, wherein the mass of the reversibly cross-linked polymer accounts for 2 to 6% of the total mass of the artificial turf yarn, and the mass ratio of the reversibly cross-linked polymer to the initiator is 2:1.

[0006] Preferably, the temperature at which the artificial turf fibers undergo a reversible cross-linking reaction is 50-80°C.

[0007] Preferably, the reversibly cross-linked polymer is treated with a silane coupling agent in the following manner:

[0008] The reversibly cross-linked polymer is stirred and heated to 85-120° C., 1-2% of a silane coupling agent is added, and the mixture is stirred for 20-40 minutes to uniformly mix the reversibly cross-linked polymer and the silane coupling agent.

[0009] Preferably, the reversibly cross-linked polymer comprises one or more of triallyl isocyanurate, 2-furancarboxylic acid, 3-furancarboxylic acid, and 2-furyl acrylic acid.

[0010] Preferably, the initiator includes one or more of bismaleimide, 1,4-(bismaleimide)butane, and N-phenylmaleimide.

[0011] Preferably, the anti-aging aid comprises calcium carbonate and an anti-ultraviolet agent.

[0012] Preferably, the processing aid is composed of zinc silicate, an environmentally friendly plasticizer, a softener, talcum powder, a reinforcing agent, a light stabilizer, a metal ion passivator, a dispersant, a light shielding agent and a sustained-release agent.

[0013] Preferably, the shape of the artificial turf is any one of diamond, olive, wavy or curly.

[0014] Preferably, the thickness of the artificial turf is 150-400 μm.

[0015] In the second aspect of the present invention, the present invention proposes a method for preparing artificial turf with self-repairing function, as follows:

[0016] The raw materials are added into a screw machine respectively, and after being processed in sequence such as blending, melt extrusion, traction, drawing, shaping, winding and twisting, artificial grass yarn with self-repairing function is obtained.

[0017] In a third aspect of the present invention, the present invention proposes an application of artificial grass yarn with self-repairing function, and the artificial grass yarn with self-repairing function is made into artificial lawn.

[0018] Beneficial effects:

[0019] Thermally reversible crosslinking is a reversible Diels-Alder reaction between a diene and a dienophile, which can realize reversible breaking and reorganization of covalent bonds under specific conditions. The present invention evenly distributes the reversible crosslinking polymer and the initiator in the artificial grass material. When the material is damaged, the reversible crosslinking polymer will automatically repair the material defects under the action of the initiator at 50-80°C, which helps to extend the service life of the polymer material. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the examples. Obviously, the following descriptions are only some embodiments of the present invention, and for those of ordinary skill in the art, other implementation methods can also be obtained based on these embodiments without creative work.

[0021] The present invention proposes an artificial turf yarn with a self-repairing function, which introduces the self-repairing function into the artificial turf yarn so that the material can self-repair after being damaged. Specifically, the artificial turf yarn includes 75 to 95 parts of linear low-density polyethylene, 5 to 25 parts of linear high-density polyethylene, 3 to 6 parts of masterbatch, 3 to 6 parts of reversible cross-linked polymer, 1 to 3 parts of initiator, 2 to 5 parts of anti-aging aid and 1 to 3 parts of processing aid by weight. Preferably, the mass of the reversible cross-linked polymer accounts for 2 to 6% of the total mass of the artificial turf yarn. The mass ratio of the reversible cross-linked polymer to the initiator is 2:1.

[0022] The main materials are linear low-density polyethylene and linear high-density polyethylene, and an initiator and a reversible cross-linking polymer are uniformly dispersed in the main materials.

[0023] Reversibly cross-linked polymers can undergo cross-linking and de-cross-linking reactions under specific temperature conditions. For example, in hot weather, artificial turf fibers tend to soften and then become damaged. Under such temperature conditions, when the artificial turf fibers are damaged, the material defects will be automatically repaired under the action of the initiator. The principle is that the reversible covalent bonds in reversibly cross-linked polymers are a type of covalent bonds that can be reversibly broken and reorganized under specific temperature conditions. By introducing reversible cross-linked polymers into the main material, when the artificial turf fibers are damaged by external stimuli, the artificial turf fibers can quickly and efficiently self-repair.

[0024] Thermally reversible crosslinking is a reversible Diels-Alder reaction between a diene and a dienophile, which can achieve reversible breaking and reorganization of covalent bonds under specific conditions. The present invention evenly distributes reversible crosslinking polymers and initiators in the artificial grass silk material. When the material is damaged, the reversible crosslinking polymer will automatically repair material defects under the action of the initiator at 50-80°C, which helps to extend the service life of the polymer material.

[0025] Preferably, the temperature at which the artificial turf fibers undergo a reversible cross-linking reaction is 50-80°C.

[0026] Preferably, the reversibly cross-linked polymer comprises one or more of triallyl isocyanurate, 2-furancarboxylic acid, 3-furancarboxylic acid, and 2-furyl acrylic acid.

[0027] Preferably, the reversibly cross-linked polymer is treated with a silane coupling agent. The silane coupling agent includes one or both of γ-aminopropyltriethoxysilane (KH550) and γ-glycidyloxypropyltrimethoxysilane (KH560). Specifically, the reversibly cross-linked polymer is stirred and heated to 85-120° C., 1-2% of the silane coupling agent is added, and stirred for 20-40 minutes to uniformly mix the reversibly cross-linked polymer and the silane coupling agent.

[0028] Preferably, the initiator includes one or more of bismaleimide, 1,4-(bismaleimide)butane, and N-phenylmaleimide.

[0029] Preferably, the anti-aging aid comprises calcium carbonate and an anti-ultraviolet agent.

[0030] Preferably, the processing aid is composed of zinc silicate, an environmentally friendly plasticizer, a softener, talcum powder, a reinforcing agent, a light stabilizer, a metal ion passivator, a dispersant, a light shielding agent and a sustained-release agent.

[0031] The present invention also provides a method for preparing artificial turf with self-repairing function, as follows:

[0032] The raw materials of linear low-density polyethylene, linear high-density polyethylene, masterbatch, reversible cross-linked polymer, initiator, anti-aging agent and processing aid are added into a screw machine, and after blending, melt extrusion, traction, drawing, shaping, winding and twisting treatment, artificial grass yarn with self-repairing function is obtained.

[0033] In the present invention, the shape of the artificial turf yarn is any one of diamond, olive, wavy or curly, and the diameter, ie, thickness, of the artificial turf yarn is 150-400 μm.

[0034] The technical solution of the present invention is described in detail below with specific embodiments.

[0035] Example 1

[0036] Calculated by weight, the raw materials of artificial turf are: 85 parts of linear low-density polyethylene, 15 parts of linear high-density polyethylene, 4 parts of masterbatch, 6 parts of reversible cross-linked polymer triallyl isocyanurate, 3 parts of initiator bismaleimide, 3 parts of anti-aging additive, and 3 parts of processing aid.

[0037] The raw materials are added into a screw machine respectively and the steps of blending, melt extrusion, pulling, drawing, shaping and winding are carried out in sequence, and finally twisting is performed to obtain artificial grass yarn with self-repairing function.

[0038] Example 2

[0039] Calculated by weight, the raw materials of artificial turf are: 75 parts of linear low-density polyethylene, 25 parts of linear high-density polyethylene, 5 parts of masterbatch, 4 parts of reversibly cross-linked polymer 2-furancarboxylic acid, 2 parts of initiator 1,4-(bismaleimide)butane, 2 parts of anti-aging additive, and 2 parts of processing aid.

[0040] The raw materials are added into a screw machine respectively and the steps of blending, melt extrusion, pulling, drawing, shaping and winding are carried out in sequence, and finally twisting is performed to obtain artificial grass yarn with self-repairing function.

[0041] Example 3

[0042] Calculated by weight, the raw materials of artificial turf are: 95 parts of linear low-density polyethylene, 5 parts of linear high-density polyethylene, 6 parts of masterbatch, 3 parts of reversibly cross-linked polymer 3-furancarboxylic acid, 1.5 parts of initiator N-phenylmaleimide, 5 parts of anti-aging additives, and 1 part of processing aids.

[0043] The raw materials are added into a screw machine respectively and the steps of blending, melt extrusion, pulling, drawing, shaping and winding are carried out in sequence, and finally twisting is performed to obtain artificial grass yarn with self-repairing function.

[0044] Example 4

[0045] Calculated by weight, the raw materials of artificial turf are: 80 parts of linear low-density polyethylene, 20 parts of linear high-density polyethylene, 3 parts of masterbatch, 5 parts of reversibly cross-linked polymer 2-furyl acrylic acid, 2.5 parts of initiator N-phenylmaleimide, 4 parts of anti-aging additives, and 3 parts of processing aids.

[0046] The raw materials are added into a screw machine respectively and the steps of blending, melt extrusion, pulling, drawing, shaping and winding are carried out in sequence, and finally twisting is performed to obtain artificial grass yarn with self-repairing function.

[0047] The artificial grass is made into artificial turf as follows:

[0048] The artificial grass with self-repairing function is woven on the base fabric through a tufting machine. A preset amount of adhesive is injected into a high-speed stirring kettle, and then inorganic fillers are added according to the ratio and stirred for 90 minutes to obtain glue. The prepared glue is evenly applied to the back of the base fabric with tufted artificial grass, and after drying, drying and punching, an artificial lawn with self-repairing function can be obtained.

[0049] Comparative Example 1

[0050] Calculated by weight, the raw materials of conventional artificial turf are: 85 parts of linear low-density polyethylene, 15 parts of linear high-density polyethylene, 4 parts of masterbatch, 3 parts of anti-aging additives, and 3 parts of processing aids.

[0051] The raw materials are added into a screw machine respectively, and the steps of blending, melt extrusion, pulling, drawing, shaping and winding are carried out in sequence, and finally twisting is performed to obtain conventional artificial grass yarn.

[0052] Comparative Example 2

[0053] Calculated by weight, the raw materials of conventional artificial turf are: 75 parts of linear low-density polyethylene, 25 parts of linear high-density polyethylene, 5 parts of masterbatch, 2 parts of anti-aging additives, and 2 parts of processing aids.

[0054] The raw materials are added into a screw machine respectively, and the steps of blending, melt extrusion, pulling, drawing, shaping and winding are carried out in sequence, and finally twisting is performed to obtain conventional artificial grass yarn.

[0055] The artificial grass is made into artificial turf as follows:

[0056] The conventional artificial grass yarn is woven on the base fabric through a tufting machine. A preset amount of adhesive is injected into a high-speed stirring kettle, and then inorganic fillers are added according to the proportion and stirred for 90 minutes to obtain glue. The prepared glue is evenly applied to the back of the base fabric on which the artificial grass yarn has been tufted, and then the conventional artificial turf is obtained after drying, drying, and punching.

[0057] The artificial turf with self-repairing function prepared in Examples 1-4 and the conventional artificial turf prepared in Comparative Examples 1-2 were subjected to ultraviolet light accelerated aging test. The test conditions are as follows. The test results are shown in Tables 1-4.

[0058] Aging equipment: Q-Lab, USA.

[0059] Experimental conditions: light source UVA-340nm, cycle: 4 hours, 0.80W / m 2 , 55℃; 2 hours, dark condensation, 45℃.

[0060] Testing equipment: Universal material testing machine

[0061] Test items: force and elongation at break

[0062] Test standard: EN14836-2018.

[0063] Table 1 Force test results

[0064]

[0065] Table 2 Force retention rate test results

[0066]

[0067]

[0068] Table 3 Elongation at break test results

[0069]

[0070] Table 4 Elongation retention test results

[0071]

[0072] From the data in Table 1-4, it can be seen that the force retention rate of artificial turf with self-repair function after 5000 hours of UV aging test is 90.49-91.06%, while the force retention rate of conventional artificial turf is only 70.35%; the elongation retention rate of artificial turf with self-repair function after 5000 hours of UV aging test is 92.12-92.52%, while the elongation retention rate of conventional artificial turf is only 78.17%. This shows that artificial turf with the addition of reversible cross-linking polymer and initiator has a significant enhancement effect in anti-aging.

[0073] The embodiments provided by the present invention are described in detail above. Specific examples are used herein to describe the principles and implementation methods of the present invention, and the description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An artificial turf with self-repairing function, characterized in that: In parts by weight, the artificial turf yarn includes 75 to 95 parts of linear low-density polyethylene, 5 to 25 parts of linear high-density polyethylene, 3 to 6 parts of masterbatch, 3 to 6 parts of reversibly cross-linked polymer, 1 to 3 parts of initiator, 2 to 5 parts of anti-aging additives and 1 to 3 parts of processing aids, wherein the mass of the reversibly cross-linked polymer accounts for 2 to 6% of the total mass of the artificial turf yarn, and the mass ratio of the reversibly cross-linked polymer to the initiator is 2:

1.

2. The artificial turf with self-repairing function according to claim 1, characterized in that: The temperature at which artificial turf undergoes a reversible cross-linking reaction is 50-80°C.

3. The artificial turf with self-repairing function according to claim 1, characterized in that: The reversibly cross-linked polymer is treated with a silane coupling agent in the following manner: The reversibly cross-linked polymer is stirred and heated to 85-120° C., 1-2% of a silane coupling agent is added, and the mixture is stirred for 20-40 minutes to uniformly mix the reversibly cross-linked polymer and the silane coupling agent.

4. The artificial turf with self-repairing function according to any one of claims 1 to 3, characterized in that: The reversibly cross-linked polymer includes one or more of triallyl isocyanurate, 2-furancarboxylic acid, 3-furancarboxylic acid, and 2-furyl acrylic acid.

5. The artificial turf with self-repairing function according to claim 1, characterized in that: The initiator includes one or more of bismaleimide, 1,4-(bismaleimido)butane, and N-phenylmaleimide.

6. The artificial turf with self-repairing function according to claim 1, characterized in that: The anti-aging additives include calcium carbonate and anti-ultraviolet agents.

7. The artificial turf with self-repairing function according to claim 1, characterized in that: The processing aid consists of zinc silicate, an environmentally friendly plasticizer, a softener, talc, a reinforcing agent, a light stabilizer, a metal ion passivator, a dispersant, a light shielding agent and a sustained-release agent.

8. The artificial turf with self-repairing function according to claim 1, characterized in that: The shape of the artificial turf yarn is any one of diamond, olive, wavy or curly, and the thickness of the artificial turf yarn is 150-400 μm.

9. A method for preparing artificial turf with self-repairing function, characterized in that: A method for preparing artificial turf with self-repairing function as claimed in any one of claims 1 to 8, comprising: The raw materials are added into a screw machine respectively, and after being processed in sequence such as blending, melt extrusion, traction, drawing, shaping, winding and twisting, artificial grass yarn with self-repairing function is obtained.

10. An application of artificial turf with self-repairing function, characterized in that: The artificial turf with self-repairing function as claimed in any one of claims 1 to 8 is made into an artificial lawn.

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