Temperature-resistant lawn and preparation method thereof

Abstract

The invention discloses a temperature-resistant lawn and a preparation method, the temperature-resistant lawn comprises a base cloth and high-temperature-resistant grass yarns tufted on the base cloth, the roots of the high-temperature-resistant grass yarns penetrate through the base cloth, the bottom surface of the base cloth is provided with a latex layer, and the roots of the high-temperature-resistant grass yarns and the base cloth are bonded and fixed; wherein the high-temperature-resistant grass yarn is prepared from the following raw materials in parts by weight: 55-70 parts of polypropylene, 30-45 parts of modified master batch, 4 parts of color master batch and 3-5 parts of processing aid, and the modified master batch is formed by mixing methyl vinyl silicone rubber, polypropylene, polyethylene and the like and co-extruding at high temperature. According to the invention, the performance of polypropylene is improved through the modified master batch, and flexible modification is carried out, so that the high-temperature-resistant grass yarn has a better soft hand feeling under the condition that the high-temperature-resistant performance of the polypropylene is kept.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial turf, and in particular relates to a temperature-resistant turf and a preparation method thereof. Background Art

[0002] Artificial grass is a man-made product that imitates natural grass. It has good simulation and the texture of natural grass. The movement performance and elasticity of artificial grass are close to those of natural grass. Compared with natural grass, the advantage of artificial grass is that it is less affected by the environment, weather, and region, and has characteristics that natural grass cannot match.

[0003] At present, the application field of artificial grass is no longer limited to sports stadiums. Artificial turf is widely used in various sports, fitness and leisure places such as football fields, tennis courts, hockey fields, golf courses, comprehensive sports fields, amusement parks, kindergartens, residential courtyards, parks, etc., due to its advantages of high frequency use all year round and all-weather, low cost and convenient maintenance. However, artificial grass in outdoor areas will be directly exposed to the sun, especially in summer, the outdoor high temperature can even reach above 40°C, especially in actual use scenarios, some scenes are high temperature environments, even reaching 110-120°C. Most of the popular ones are PE turfs, with a heat resistance temperature of about 60-70°C. Although artificial turfs made of PP and nylon can withstand 110-120°C, their texture is very hard and uncomfortable. The present invention intends to propose a heat-resistant lawn that maintains the softness of the lawn while increasing the temperature resistance limit. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a heat-resistant lawn and a preparation method, by improving the performance of polypropylene through modified masterbatch, performing flexibility modification, and making the heat-resistant grass yarn have a better and smoother feel while retaining the high temperature resistance of polypropylene.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect of the present invention, a heat-resistant lawn is provided, comprising a base fabric and heat-resistant grass yarns tufted on the base fabric, wherein the roots of the heat-resistant grass yarns pass through the base fabric, and a latex layer is provided on the bottom surface of the base fabric to bond and fix the roots of the heat-resistant grass yarns to the base fabric;

[0007] Among them, calculated by weight, the raw materials for preparing the high temperature resistant grass yarn include: 55-70 parts of polypropylene, 30-45 parts of modified masterbatch, 4 parts of masterbatch and 3-5 parts of processing aids, and the modified masterbatch includes polypropylene, polyethylene and solid silicone rubber.

[0008] Preferably, calculated by weight, the raw materials of the modified masterbatch include: 55-75 parts of polypropylene, 10-25 parts of solid silicone rubber, 4-10 parts of POE, 10-20 parts of polyethylene and 5-8 parts of calcium carbonate.

[0009] More preferably, the raw materials of the modified masterbatch include: 60 parts of polypropylene, 15 parts of solid silicone rubber, 5 parts of POE, 20 parts of polyethylene and 8 parts of calcium carbonate.

[0010] More preferably, the solid silicone rubber is methyl vinyl silicone rubber having a molecular weight of 450,000 to 650,000.

[0011] More preferably, the preparation method of the modified masterbatch is: the raw materials polypropylene, solid silicone rubber, POE, polyethylene and calcium carbonate are mixed uniformly at high speed, and then extruded into granules through a twin-screw extruder at an extrusion temperature of 190 to 235°C, and after blending extrusion-water cutting-drying, a solid rubber masterbatch is obtained.

[0012] Preferably, the calcium carbonate is 800-mesh powdered heavy calcium carbonate.

[0013] Preferably, the processing aids include light stabilizers, antioxidants and fluoride processing aids.

[0014] In the second aspect of the present invention, the present invention provides a method for preparing a high temperature resistant lawn, as follows:

[0015] (1) Polypropylene, modified masterbatch, color masterbatch and processing aids are uniformly mixed at 230-240° C., and after co-extrusion, the mixture is subjected to traction, drawing, shaping, winding and twisting to form high temperature resistant grass yarn;

[0016] (2) weaving the prepared high temperature resistant grass yarn on a base fabric, coating the bottom surface of the base fabric with latex to form a latex layer, so that the roots of the high temperature resistant grass yarn are bonded and fixed to the base fabric, thereby obtaining a high temperature resistant lawn.

[0017] Preferably, in step (1), the drafting ratio is 5 to 6 times.

[0018] Beneficial effects:

[0019] The present invention prepares a modified masterbatch to improve the performance of polypropylene and perform flexibility modification. Under the condition of retaining the high temperature resistance of polypropylene, the high temperature resistant grass yarn has a better soft feel. In addition, the modified masterbatch has a long molecular chain and good chemical inertness, and it can also be used as a plasticizer. After the high temperature resistant grass yarn is finalized, the product still has uncross-linked silicone rubber molecules, which are evenly dispersed in the polypropylene, so that the polypropylene molecules are not completely cross-linked, and relative sliding can occur between the polypropylene molecules, thereby improving the flexibility of the high temperature resistant grass yarn product. 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 are described below in conjunction with the embodiments. Obviously, the following description is only some embodiments of the present invention, and for ordinary technicians in this field, other implementation methods can also be obtained based on these embodiments without paying creative work.

[0021] The present invention provides a heat-resistant lawn, which increases the temperature limit of artificial grass yarn to 120°C or even higher, while maintaining the soft and smooth feel of the artificial grass yarn. The heat-resistant lawn of the present invention comprises a base fabric and heat-resistant grass yarn tufted on the base fabric, the roots of the heat-resistant grass yarn pass through the base fabric, a latex layer is arranged on the bottom surface of the base fabric, and the roots of the heat-resistant grass yarn are bonded and fixed to the base fabric.

[0022] Calculated by weight, the raw materials for preparing high temperature resistant grass yarn include: 55-70 parts of polypropylene, 30-45 parts of modified masterbatch, 4 parts of masterbatch and 3-5 parts of processing aids, wherein the components of the modified masterbatch include polypropylene, polyethylene and solid silicone rubber. The modified masterbatch is prepared by the present invention to improve the performance of polypropylene and perform flexibility modification, so that the high temperature resistant grass yarn has a better soft feel while retaining the high temperature resistance of polypropylene. In addition, the modified masterbatch has a long molecular chain and good chemical inertness, and it can also be used as a plasticizer. After the high temperature resistant grass yarn is finalized, the product still has uncross-linked silicone rubber molecules, which are evenly dispersed in the polypropylene, so that the polypropylene molecules are not completely cross-linked, and relative sliding can occur between the polypropylene molecules, thereby improving the flexibility of the high temperature resistant grass yarn product. Moreover, during the extrusion and traction process during preparation, some solid silicone rubber small molecules will migrate out of the material surface to form a thin silicone rubber oil film. Therefore, the present invention realizes the modification of polypropylene through the modified masterbatch, retains its high temperature resistance and significantly improves flexibility.

[0023] In the present invention, the raw materials of the modified masterbatch include, by weight: 55-75 parts of polypropylene, 10-25 parts of solid silicone rubber, 4-10 parts of POE, 10-20 parts of polyethylene and 5-8 parts of calcium carbonate. Preferably, the raw materials of the modified masterbatch include: 60 parts of polypropylene, 15 parts of solid silicone rubber, 5 parts of POE, 20 parts of polyethylene and 8 parts of calcium carbonate.

[0024] In the modified masterbatch, solid silicone rubber has a modifying effect on polypropylene. When the solid silicone rubber is less than 5 parts, it has no softening effect. The grass yarn made with this modified masterbatch is relatively hard and has a similar touch to conventional polypropylene grass yarn. When the solid silicone rubber is higher than 25 parts, the modified masterbatch is not easy to disperse evenly in the system, and the wire breakage is prone to occur during the wire drawing process.

[0025] Preferably, the solid silicone rubber is methyl vinyl silicone rubber with a molecular weight of 450,000 to 650,000. For example, the solid silicone rubber can be Hesheng 110-2 silicone rubber raw rubber.

[0026] POE has a toughening effect and can improve the low-temperature brittleness of polypropylene. Polyethylene also plays a toughening role and also plays a role in dispersing solid silicone rubber. Solid silicone rubber is a whole block paste and is not easy to disperse. Adding calcium carbonate can help with dispersibility. At the same time, calcium carbonate is also a nucleating agent for polypropylene and polyethylene.

[0027] Preferably, the calcium carbonate is 800 mesh powdered heavy calcium carbonate.

[0028] Preferably, in the components of the high temperature resistant grass yarn, the processing aids include light stabilizers, antioxidants and fluoride processing aids that are resistant to ultraviolet light.

[0029] In the present invention, the preparation method of the modified masterbatch is: the raw materials polypropylene, solid silicone rubber, POE, polyethylene and calcium carbonate are mixed uniformly at high speed, and then extruded and granulated by a twin-screw extruder at an extrusion temperature of 190 to 235° C. After blending, extrusion, water cutting and drying, a solid rubber masterbatch is obtained.

[0030] The present invention also provides a method for preparing a high temperature resistant lawn, as follows:

[0031] (1) polypropylene, modified masterbatch, color masterbatch and processing aid are mixed uniformly at 235° C., and after co-extrusion, the mixture is subjected to traction, drawing, shaping, winding and twisting treatment to form high temperature resistant grass yarn, wherein the drawing ratio is 5 to 6 times;

[0032] (2) weaving the prepared high temperature resistant grass yarn on a base fabric, coating the bottom surface of the base fabric with latex to form a latex layer, so that the roots of the high temperature resistant grass yarn are bonded and fixed to the base fabric, thereby obtaining a high temperature resistant lawn.

[0033] The technical scheme of the present invention is described in detail with specific embodiments below, wherein the polypropylene is Sinopec L5E89, the processing aids include light stabilizers, antioxidants, and fluoride processing aids, wherein the light stabilizer is BASF 2020, the antioxidant is 225, the solid silicone rubber is Hesheng 110-2 and the molecular weight is 450,000-650,000 methyl vinyl silicone rubber, the POE is Vistamaxx 3980FL, and the polyethylene is Mobil 6101.

[0034] Example 1

[0035] Preparation of modified masterbatch: 65 parts of polypropylene, 20 parts of solid silicone rubber, 5 parts of POE, 20 parts of polyethylene and 8 parts of calcium carbonate are mixed evenly at high speed, and then extruded into granules through a twin-screw extruder at an extrusion temperature of 230°C. After blending, extrusion, water cutting and drying, a solid rubber masterbatch is obtained.

[0036] Preparation of high temperature lawn: 55 parts of polypropylene, 45 parts of modified masterbatch, 4 parts of color masterbatch, 2.4 parts of light stabilizer, 1.6 parts of antioxidant and 1 part of fluoride processing aid are mixed evenly at 235°C, and after co-extrusion, the mixture is subjected to traction, drawing, shaping, winding and twisting treatment, wherein the drawing ratio is 6 times, to form high temperature resistant grass yarn;

[0037] The prepared high temperature resistant grass yarn is woven on a base fabric, latex is coated on the bottom surface of the base fabric to form a latex layer, and the roots of the high temperature resistant grass yarn are bonded and fixed to the base fabric to obtain a high temperature resistant lawn.

[0038] Example 2

[0039] Preparation of modified masterbatch: 75 parts of polypropylene, 10 parts of solid silicone rubber, 5 parts of POE, 20 parts of polyethylene and 8 parts of calcium carbonate are mixed evenly at high speed, and then extruded into granules through a twin-screw extruder at an extrusion temperature of 235°C. After blending, extrusion, water cutting and drying, a solid rubber masterbatch is obtained.

[0040] Preparation of high temperature lawn: 55 parts of polypropylene, 45 parts of modified masterbatch, 4 parts of color masterbatch, 2.4 parts of light stabilizer, 1.6 parts of antioxidant and 1 part of fluoride processing aid are mixed evenly at 235°C, and after co-extrusion, the mixture is subjected to traction, drawing, shaping, winding and twisting treatment, wherein the drawing ratio is 6 times, to form high temperature resistant grass yarn;

[0041] The prepared high temperature resistant grass yarn is woven on a base fabric, latex is coated on the bottom surface of the base fabric to form a latex layer, and the roots of the high temperature resistant grass yarn are bonded and fixed to the base fabric to obtain a high temperature resistant lawn.

[0042] Example 3

[0043] Preparation of modified masterbatch: 57 parts of polypropylene, 15 parts of solid silicone rubber, 8 parts of POE, 20 parts of polyethylene and 8 parts of calcium carbonate are mixed evenly at high speed, and then extruded into granules through a twin-screw extruder at an extrusion temperature of 235°C. After blending, extrusion, water cutting and drying, a solid rubber masterbatch is obtained.

[0044] Preparation of high temperature lawn: 70 parts of polypropylene, 30 parts of modified masterbatch, 4 parts of color masterbatch, 2.4 parts of light stabilizer, 1.6 parts of antioxidant and 1 part of fluoride processing aid are mixed evenly at 235°C, and after co-extrusion, the mixture is subjected to traction, drawing, shaping, winding and twisting treatment, wherein the drawing ratio is 6 times, to form high temperature resistant grass yarn;

[0045] The prepared high temperature resistant grass yarn is woven on a base fabric, latex is coated on the bottom surface of the base fabric to form a latex layer, and the roots of the high temperature resistant grass yarn are bonded and fixed to the base fabric to obtain a high temperature resistant lawn.

[0046] Comparative Example 1

[0047] Compared with Example 1, no modified masterbatch was added in this comparative example.

[0048] Preparation of high temperature lawn: 100 parts of polypropylene, 4 parts of masterbatch, 2.4 parts of light stabilizer, 1.6 parts of antioxidant and 1 part of fluoride processing aid are mixed evenly at 235°C, and after blending and extrusion, the mixture is subjected to traction, drawing, shaping, winding and twisting treatment, wherein the drawing ratio is 6 times, to form high temperature resistant grass yarn;

[0049] The prepared high temperature resistant grass yarn is woven on a base fabric, latex is coated on the bottom surface of the base fabric to form a latex layer, and the roots of the high temperature resistant grass yarn are bonded and fixed to the base fabric to obtain a high temperature resistant lawn.

[0050] Comparative Example 2

[0051] Compared with Example 1, the solid silicone rubber in the modified masterbatch of this comparative example is excessive.

[0052] Preparation of modified masterbatch: 10 parts of polypropylene, 65 parts of solid silicone rubber, 5 parts of POE, 20 parts of polyethylene and 8 parts of calcium carbonate are mixed evenly at high speed, and then extruded into granules through a twin-screw extruder at an extrusion temperature of 235°C. After blending, extrusion, water cutting and drying, a solid stock rubber masterbatch is obtained (the proportion of solid silicone rubber is too high, the material cannot be discharged normally during extrusion granulation, and the dispersion is uneven, and additional forced feeding equipment is required).

[0053] Preparation of high temperature lawn: 55 parts of polypropylene, 45 parts of modified masterbatch, 4 parts of color masterbatch, 2.4 parts of light stabilizer, 1.6 parts of antioxidant and 1 part of fluoride processing aid were mixed evenly at 235°C, and after co-extrusion, the mixture was treated by traction, drawing, shaping, winding and twisting, wherein the drawing ratio was 6 times, to form high temperature resistant grass yarn (the yarn was frequently broken during the preparation process of grass yarn);

[0054] The prepared high temperature resistant grass yarn is woven on a base fabric, latex is coated on the bottom surface of the base fabric to form a latex layer, and the roots of the high temperature resistant grass yarn are bonded and fixed to the base fabric to obtain a high temperature resistant lawn.

[0055] Comparative Example 3

[0056] Compared with Example 1, the solid silicone rubber in the modified masterbatch of this comparative example is insufficient.

[0057] Preparation of modified masterbatch: 72 parts of polypropylene, 3 parts of solid silicone rubber, 5 parts of POE, 20 parts of polyethylene and 8 parts of calcium carbonate are mixed evenly at high speed, and then extruded into granules through a twin-screw extruder at an extrusion temperature of 235°C. After blending, extrusion, water cutting and drying, a solid rubber masterbatch is obtained.

[0058] Preparation of high temperature lawn: 55 parts of polypropylene, 45 parts of modified masterbatch, 4 parts of color masterbatch, 2.4 parts of light stabilizer, 1.6 parts of antioxidant and 1 part of fluoride processing aid are mixed evenly at 235°C, and after co-extrusion, the mixture is subjected to traction, drawing, shaping, winding and twisting treatment, wherein the drawing ratio is 6 times, to form high temperature resistant grass yarn;

[0059] The prepared high temperature resistant grass yarn is woven on a base fabric, latex is coated on the bottom surface of the base fabric to form a latex layer, and the roots of the high temperature resistant grass yarn are bonded and fixed to the base fabric to obtain a high temperature resistant lawn.

[0060]

[0061] 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. A temperature-resistant lawn, characterized in that: It comprises a base fabric and high temperature resistant grass yarns tufted on the base fabric, wherein the roots of the high temperature resistant grass yarns pass through the base fabric, and a latex layer is arranged on the bottom surface of the base fabric to bond and fix the roots of the high temperature resistant grass yarns to the base fabric; Among them, calculated by weight, the raw materials for preparing the high-temperature resistant grass yarn include: 55-70 parts of polypropylene, 30-45 parts of modified masterbatch, 4 parts of color masterbatch and 3-5 parts of processing aids, and the ingredients of the modified masterbatch include polypropylene, polyethylene and solid silicone rubber.

2. The temperature-resistant lawn according to claim 1, characterized in that: Calculated by weight, the raw materials of the modified masterbatch include: 55-75 parts of polypropylene, 10-25 parts of solid silicone rubber, 4-10 parts of POE, 10-20 parts of polyethylene and 5-8 parts of calcium carbonate.

3. The temperature-resistant lawn according to claim 2, characterized in that: The raw materials of the modified masterbatch include: 60 parts of polypropylene, 15 parts of solid silicone rubber, 5 parts of POE, 20 parts of polyethylene and 8 parts of calcium carbonate.

4. The temperature-resistant lawn according to claim 2 or 3, characterized in that: Solid silicone rubber is methyl vinyl silicone rubber with a molecular weight of 450,000 to 650,000.

5. The temperature-resistant lawn according to claim 2 or 3, characterized in that: The preparation method of the modified masterbatch is: the raw materials polypropylene, solid silicone rubber, POE, polyethylene and calcium carbonate are mixed evenly at high speed, and then extruded into granules through a twin-screw extruder at an extrusion temperature of 190-235°C, and after blending extrusion-water cutting-drying, a solid rubber masterbatch is obtained.

6. The temperature-resistant lawn according to claim 2 or 3, characterized in that: The calcium carbonate is 800-mesh powdered heavy calcium carbonate.

7. The temperature-resistant lawn according to claim 1, characterized in that: The processing aids include light stabilizers, antioxidants and fluoride processing aids.

8. A method for preparing a temperature-resistant lawn, characterized in that: The preparation of the heat-resistant lawn as claimed in any one of claims 1 to 7 comprises the following steps: (1) Polypropylene, modified masterbatch, color masterbatch and processing aids are uniformly mixed at 230-240° C., and after co-extrusion, the mixture is subjected to traction, drawing, shaping, winding and twisting to form high temperature resistant grass yarn; (2) weaving the prepared high temperature resistant grass yarn on a base fabric, coating the bottom surface of the base fabric with latex to form a latex layer, so that the roots of the high temperature resistant grass yarn are bonded and fixed to the base fabric, thereby obtaining a high temperature resistant lawn.

9. The method for preparing a heat-resistant lawn according to claim 8, characterized in that: In step (1), the drafting ratio is 5 to 6 times.

Images