A matte functional masterbatch for artificial turf and preparation method thereof

Abstract

The invention discloses a matting functional masterbatch for artificial grass yarn and a preparation method thereof. In terms of weight percentage, the raw material for preparation contains 20%-50% of base resin, 45%-75% of modified matting agent, 1%-3% of lubricant and 2%-4% of adhesive, and the modified matting agent is a polystyrene-inorganic matting agent composite particle with a core-shell structure. The melted material can achieve good integrity and maintain good fluidity, and is not prone to slag falling or excessive viscosity adhering to the die of a wire drawing device, thereby helping to improve the continuity, efficiency and output of production, and also reducing the occurrence of melt fracture.

Description

Technical Field

[0001] The invention relates to the field of masterbatches for plastics, and in particular to a matte functional masterbatch for artificial turf and a preparation method thereof. Background Art

[0002] With the development of society, the use of artificial turf is increasing. Among them, artificial grass is the core material of artificial turf. In order to simulate the color of natural grass, it is necessary to maintain the natural and elegant color of grass, and not to highlight the brightness and unnaturalness of plastic. Therefore, it is necessary to eliminate the mirror reflection of grass. For this reason, the matte color of grass becomes the main color requirement of artificial turf.

[0003] However, many of the current grass wire matting methods use calcium carbonate or talcum powder and other mineral filling methods to make matting masterbatch. The matting masterbatch is added during the wire drawing process. As a result, the minerals precipitate to form carbon deposits at the die mouth, which can easily lead to wire breakage and interrupt continuous production, resulting in huge production waste and reduced production efficiency. In addition, the matting effect of such mineral filling is not ideal.

[0004] Chinese patent CN109880195B discloses a matting masterbatch for plastics and its preparation method, as well as a plastic product, wherein the matting masterbatch for plastics, in terms of weight percentage, comprises raw materials for preparing the matting masterbatch including 10-30% of a carrier, 1-5% of a lubricant, 20-50% of an inorganic matting agent, and 20-50% of an organic matting agent. The inorganic matting agent is a mixture of a matting agent with a porous structure and a matting agent with a strip structure, and the organic matting agent is a fully vulcanized powder rubber and / or a fully cross-linked powder resin. In the invention, the matting performance of the matting masterbatch is improved by the mutual cooperation of the inorganic matting agent and the organic matting agent in two shapes. However, the inorganic matting agent in the invention is difficult to be evenly dispersed in the carrier (i.e., the plastic matrix), which will cause a decrease in the mechanical properties of the matting masterbatch, thereby affecting the mechanical properties of the plastic made by introducing the matting masterbatch.

[0005] Chinese patent application CN114591554A discloses a matting masterbatch for plastics and a preparation method thereof, wherein the matting masterbatch for plastics comprises the following raw materials: base resin, composite matting agent, lubricant and compatibilizer; the composite matting agent is an inorganic matting agent (titanium dioxide) with a matting hyperbranched polymer grafted on the surface, wherein the matting hyperbranched polymer contains a large number of pyridine rings and benzotriazole light-absorbing structures, which greatly reduces the reflected light of the masterbatch and improves the matting performance of the masterbatch; again, the matting hyperbranched polymer is grafted on the surface of titanium dioxide, which promotes the uniform dispersion of titanium dioxide in the masterbatch base material, and at the same time, the grafted matting hyperbranched polymer can interact with the masterbatch base material to form a polymer molecular chain, reduce the migration of titanium dioxide in the matting masterbatch base material, and promote the composite matting agent to enhance the matting performance of the matting masterbatch and the mechanical performance. However, the cost of titanium dioxide is high, the preparation method of the composite matting agent is complicated, the grafting rate is not high, and it is rarely used in artificial grass. Summary of the invention

[0006] The purpose of the present invention is to provide a matte functional masterbatch for artificial turf yarn.

[0007] To achieve the above-mentioned purpose, the present invention provides a matting functional masterbatch for artificial turf yarn, characterized in that, in terms of weight percentage, the preparation raw materials contain 20%-50% of base resin, 45%-75% of modified matting agent, 1%-3% of lubricant and 2%-4% of adhesive, and the modified matting agent is a polystyrene-inorganic matting agent composite particle with a core-shell structure.

[0008] Furthermore, the matrix resin is any one of polyethylene, polypropylene and nylon 6.

[0009] Furthermore, the preparation method of the modified matting agent is:

[0010] (1) At room temperature, 3-(methoxysilyl)propyl methacrylate is ultrasonically dispersed in an ethanol solution, and then an inorganic matting agent powder is added and ultrasonically dispersed for 30-45 minutes;

[0011] (2) adding styrene monomer, polyvinyl pyrrolidone and azoisobutyronitrile to the above solution, heating in a water bath at 70° C. for 24 hours, and stirring at a speed of 300 r / min-500 r / min;

[0012] Preferably, the usage ratio of 3-(methoxysilyl)propyl methacrylate, ethanol solution, inorganic matting agent: styrene monomer, PVP, AIBN, inorganic matting agent is 1-2g: 1000mL: 100-200g; 100-200g: 1g: 4-8g: 100-200g;

[0013] (3) After the reaction is completed, the obtained sample is washed with water and alcohol for multiple times until there are no soluble impurities on the surface, and then filtered and vacuum dried to obtain polystyrene-inorganic matting agent composite particles.

[0014] Furthermore, the inorganic matting agent is one or more of calcium carbonate, talc, silicon dioxide, kaolin, and diatomaceous earth.

[0015] Furthermore, the lubricant is at least two of a mixture of stearic acid and N,N'-ethylene bisstearamide, a complex fatty acid salt mixture, polyethylene wax, zinc stearate, calcium stearate, silicone, and polyvinylidene fluoride.

[0016] Furthermore, the binder is at least one of ethylene glycol stearate and pullulan.

[0017] The present invention also provides a method for preparing the matting functional masterbatch for the artificial turf, which is characterized by comprising the following steps:

[0018] The base resin, two-thirds of the volume of the modified matting agent, the adhesive, and the lubricant are preliminarily mixed and mixed evenly to obtain the main feed mixture 1, and at the same time, one-third of the volume of the modified matting agent is used as the side feed mixture 2. The main feed mixture 1 is added to the twin-screw extruder from the main feed port, and at the same time, the side feed mixture 2 is added to the twin-screw extruder from the side feed port. The mixture is melt-extruded by the twin-screw extruder, and then the strands are granulated to obtain the matting functional masterbatch for artificial turf.

[0019] The present invention adds a modified matting agent with a core-shell structure, and the inorganic matting agent in the core can improve the matting performance and mechanical properties of the master batch base material. At the same time, the polystyrene in the shell has good compatibility with the base resin, which promotes the uniform dispersion of the inorganic matting agent in the master batch base material; the base resin and the lubricant are combined together to help the functional matting master batch material have good mixing uniformity. At the same time, the addition of the adhesive also helps to increase the adhesion effect between the base resin and the modified matting agent, thereby improving the combined effect between the components inside the matting functional master batch material, so that the melted material can achieve good integrity and maintain good fluidity, and is not prone to slag falling or excessive viscosity adhering to the die of the wire drawing equipment, thereby helping to improve the continuity, high efficiency and output of production, and also reducing the occurrence of melt fracture. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, and the examples of the embodiments are intended to be used to explain the present invention, but should not be construed as limiting the present invention. In the embodiments, if specific techniques or conditions are not specified, they are carried out according to the techniques or conditions described in the literature in this area or according to the product specification. If the manufacturer is not specified for reagents or instruments used, they are all conventional products that can be obtained commercially.

[0021] The invention provides a matting functional masterbatch for artificial turf yarn, which is characterized in that, in terms of weight percentage, the preparation raw materials contain 20%-50% of base resin, 45%-75% of modified matting agent, 1%-3% of lubricant and 2%-4% of adhesive, and the modified matting agent is a polystyrene-inorganic matting agent composite particle with a core-shell structure.

[0022] Furthermore, the matrix resin is any one of polyethylene, polypropylene and nylon 6.

[0023] Furthermore, the preparation method of the modified matting agent is:

[0024] (1) At room temperature, 3-(methoxysilyl)propyl methacrylate is ultrasonically dispersed in an ethanol solution, and then an inorganic matting agent powder is added and ultrasonically dispersed for 30-45 minutes;

[0025] (2) adding styrene monomer, polyvinyl pyrrolidone and azoisobutyronitrile to the above solution, heating in a water bath at 70° C. for 24 hours, and stirring at a speed of 300 r / min-500 r / min;

[0026] Preferably, the usage ratio of 3-(methoxysilyl)propyl methacrylate, ethanol solution, inorganic matting agent: styrene monomer, PVP, AIBN, inorganic matting agent is 1-2g: 1000mL: 100-200g; 100-200g: 1g: 4-8g: 100-200g;

[0027] (3) After the reaction is completed, the obtained sample is washed with water and alcohol for multiple times until there are no soluble impurities on the surface, and then filtered and vacuum dried to obtain polystyrene-inorganic matting agent composite particles.

[0028] Furthermore, the inorganic matting agent is one or more of calcium carbonate, talc, silicon dioxide, kaolin, and diatomaceous earth.

[0029] Furthermore, the lubricant is at least two of a mixture of stearic acid and N,N'-ethylene bisstearamide, a complex fatty acid salt mixture, polyethylene wax, zinc stearate, calcium stearate, silicone, and polyvinylidene fluoride.

[0030] Furthermore, the binder is at least one of ethylene glycol stearate and pullulan.

[0031] The present invention also provides a method for preparing the matting functional masterbatch for the artificial turf, which is characterized by comprising the following steps:

[0032] The base resin, two-thirds of the volume of the modified matting agent, the adhesive, and the lubricant are preliminarily mixed and mixed evenly to obtain the main feed mixed material 1, and at the same time, one-third of the volume of the modified matting agent is used as the side feed mixed material 2. The main feed mixed material 1 is added to the twin-screw extruder from the main feed port, and at the same time, the side mixed material 2 is added to the twin-screw extruder from the side feed port. The mixture is melt-extruded by the twin-screw extruder, and then the strands are granulated to obtain the matting functional masterbatch for artificial turf.

[0033] Example 1: Preparation of matte functional masterbatch

[0034] 20% of polyethylene, 75% of modified matting agent, 1% of lubricant and 4% of adhesive were weighed by weight, mixed at high speed, melt-kneaded and extruded into granules by a twin-screw extruder to obtain matting functional masterbatch.

[0035] Among them, the modified matting agent is a polystyrene-silicon dioxide composite material with a core-shell structure, the particle size of the silicon dioxide is 2-8 microns, and the specific amounts of TMSMA, ethanol solution, and inorganic matting agent in the preparation are: 2g:1000mL:150g; ultrasonic dispersion for 40min; the specific amounts of styrene monomer, PVP, AIBN, and inorganic matting agent are: 150g:1g:6g:150g.

[0036] The lubricant is a mixture of polyethylene wax and zinc stearate in a mass ratio of 1:1, and the adhesive is stearic acid ethylene glycol diester.

[0037] Example 2: Preparation of matte functional masterbatch

[0038] 30% of polypropylene, 65% of modified matting agent, 2% of lubricant and 3% of adhesive were weighed by weight, mixed at high speed, melt-kneaded and extruded into granules by a twin-screw extruder to obtain matting masterbatch.

[0039] Among them, the modified matting agent is a polystyrene-talc composite material with a core-shell structure, the particle size of the talc is 2-8 microns, and the specific amounts of TMSMA, ethanol solution, and inorganic matting agent in the preparation are: 1g: 1000mL: 100g; ultrasonic dispersion for 45min; the specific amounts of styrene monomer, PVP, AIBN, and inorganic matting agent are: 100g: 1g: 4g: 100g.

[0040] The lubricant is a mixture of stearic acid and N, N'-ethylene bisstearamide in a mass ratio of 1:1, and the adhesive is pullulan.

[0041] Example 3: Preparation of matte functional masterbatch

[0042] 40% of nylon 6, 55% of modified matting agent, 2.5% of lubricant and 2.5% of adhesive were weighed by weight, mixed at high speed, melt-kneaded and extruded into granules by a twin-screw extruder to obtain matting masterbatch.

[0043] Among them, the modified matting agent is a polystyrene-calcium carbonate composite material with a core-shell structure, the particle size of calcium carbonate is 2-8 microns, and the specific amounts of TMSMA, ethanol solution, and inorganic matting agent in the preparation are: 1.5g: 1000mL: 200g; ultrasonic dispersion for 30min; the specific amounts of styrene monomer, PVP, AIBN, and inorganic matting agent are: 200g: 1g: 8g: 200g.

[0044] The lubricant is a mixture of silicone and polyvinylidene fluoride in a mass ratio of 1:1, and the adhesive is pullulan.

[0045] Example 4: Preparation of matte functional masterbatch

[0046] 50% of polyethylene, 45% of modified matting agent, 3% of lubricant and 2% of adhesive were weighed by weight, mixed at high speed, melt-kneaded and extruded into granules by a twin-screw extruder to obtain matting masterbatch.

[0047] Among them, the modified matting agent is a polystyrene-diatomaceous earth composite material with a core-shell structure, the particle size of the diatomaceous earth is 2-8 microns, and the specific amounts of TMSMA, ethanol solution, and inorganic matting agent in the preparation are: 2g:1000mL:180g; ultrasonic dispersion for 35min; the specific amounts of styrene monomer, PVP, AIBN, and inorganic matting agent are: 180g:1g:8g:180g.

[0048] The lubricant is a mixture of calcium stearate, silicone and polyvinylidene fluoride in a mass ratio of 1:1:1, and the adhesive is stearic acid ethylene glycol diester.

[0049] Comparative Example 1

[0050] Similar to Example 1, except that the modified matting agent is replaced by an unmodified inorganic matting agent, that is, unmodified silica.

[0051] Comparative Example 2

[0052] Similar to Example 1, no lubricant was added.

[0053] Comparative Example 3

[0054] Similar to Example 1, no adhesive was added.

[0055] Comparative Example 4

[0056] Similar to Example 1, except that the amount of polyethylene added is changed to 75%, and the amount of inorganic matte masterbatch added is changed to 20%.

[0057] The matting functional masterbatch of Example 1, Example 4, and Comparative Examples 1 to 4 was added to 80% of polyethylene plastic particles at a weight fraction of 20%, the matting functional masterbatch of Example 2 was added to 80% of polypropylene plastic particles at a weight fraction of 20%, and the matting functional masterbatch of Example 3 was added to 80% of nylon 6 plastic particles at a weight fraction of 20%. After being mixed, they were injection molded into samples by an injection molding machine. The glossiness of each sample was tested by a gloss tester, wherein the melt flow rate adopted the ISO 1133 test standard, and the gloss adopted the IS0 2883 test standard. At the same time, after mixing, they were extruded into artificial grass yarns. During the drawing process, the accumulation of the test samples on the die and the melt fracture phenomenon were observed, recorded and analyzed, and the results are shown in Table 1.

[0058] Table 1

[0059]

[0060]

[0061] As can be seen from Table 1, compared with Comparative Examples 1 to 3, the plastic samples made of matting functional masterbatch of Examples 1 to 4 have smaller gloss values ​​and better matting effects when subjected to gloss test. This is mainly because the inorganic matting agent in Comparative Example 1 is not modified, and it is often wrapped inside the plastic during plastic processing, and will not be enriched on the surface of the plastic product, thereby greatly reducing the matting effect. Comparative Example 2 does not add lubricant, the matting effect is poor, the accumulation phenomenon at the die mouth and the melt fracture phenomenon are serious. Comparative Example 3 does not add adhesive, the adhesion effect between the base resin and the modified matting agent is poor, the matting effect, the accumulation phenomenon at the die mouth and the melt fracture phenomenon are serious, and when the amount of the modified matting agent is reduced, such as the modified matting agent added in Comparative Example 4 is 20%, the matting effect is poor.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A matte functional masterbatch for artificial turf, characterized in that: The raw material contains 20%-50% of base resin, 45%-75% of modified matting agent, 1%-3% of lubricant and 2%-4% of adhesive in terms of weight percentage, wherein the modified matting agent is polystyrene-inorganic matting agent composite particles having a core-shell structure; The lubricant is at least two of a mixture of stearic acid and N,N'-ethylene bisstearamide, polyethylene wax, zinc stearate, calcium stearate, silicone, and polyvinylidene fluoride; The binder is at least one of ethylene glycol stearate and pullulan; The preparation method of the modified matting agent is: (1) At room temperature, ultrasonically disperse 3-(methoxysilyl)propyl methacrylate in an ethanol solution, then add an inorganic matting agent powder and ultrasonically disperse for 30-45 minutes; (2) Add styrene monomer, polyvinyl pyrrolidone and azoisobutyronitrile to the solution obtained above, heat in a water bath at 70°C for 24 hours, and stir at a speed of 300-500 r / min; The usage ratio of 3-(methoxysilyl)propyl methacrylate, ethanol solution and inorganic matting agent is 1-2g:1000mL:100-200g, and the usage ratio of styrene monomer, PVP, AIBN and inorganic matting agent is 100-200g:1g:4-8g:100-200g; (3) After the reaction is completed, the sample is washed with water and alcohol for multiple times until there are no soluble impurities on the surface, and then filtered and vacuum dried to obtain polystyrene-inorganic matting agent composite particles.

2. The matting functional masterbatch for artificial turf according to claim 1, characterized in that: The matrix resin is any one of polyethylene, polypropylene and nylon 6.

3. The matting functional masterbatch for artificial turf according to claim 1, characterized in that: The inorganic matting agent is one or more of calcium carbonate, talc, silicon dioxide, kaolin and diatomaceous earth.

4. A method for preparing the matting functional masterbatch for artificial turf according to any one of claims 1 to 3, characterized in that: The following steps are involved: The base resin, two-thirds of the volume of the modified matting agent, the adhesive and the lubricant are preliminarily mixed and evenly mixed to obtain a main feed mixed material 1, and at the same time, one-third of the volume of the modified matting agent is used as a side feed mixed material 2. The main feed mixed material 1 is added to the twin-screw extruder from the main feed port, and at the same time, the side feed mixed material 2 is added to the twin-screw extruder from the side feed port. The mixture is melt-extruded by the twin-screw extruder, and then the matting functional masterbatch for artificial turf is obtained after stranding and granulation.

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