Composite resin composition for geocell or coral cell

Abstract

The present invention relates to a composite resin composition for geocells or coral cells. The composite resin composition according to a specific embodiment of the present invention has a high density and excellent mechanical properties such as tensile strength and elongation. Composite resin molded articles obtained therefrom can be effectively used to manufacture geocells or coral cells.

Description

Technical Field

[0001] The present invention relates to a composite resin composition for geocells or coral cells. Specifically, the present invention relates to a composite resin composition for geocells or coral cells having high density and excellent mechanical properties such as tensile strength and elongation. Background Art

[0002] Geocells are civil engineering reinforcement materials used to strengthen weak foundations. They have a three-dimensional honeycomb structure made by ultrasonically fusing multiple high-density polyethylene strips of a fixed width at regular intervals. After the geocells are deployed extensively on the foundation and filled with mud, sand, or other fillers and compacted, they improve the foundation's rigidity and engineering properties (see Korean Patent Application Publication Nos. 10-2016-0104634 and 10-2017-0112806).

[0003] In recent years, rapid climate change has led to increased rainfall in Southeast Asia and other regions, causing frequent dam breaches. Therefore, geocells are expected to play a role in preventing these incidents.

[0004] On the other hand, coral cells are artificial coral reefs used to prevent coastal erosion. Compared with existing concrete-based artificial coral reefs, they have the advantages of being easy to manufacture and construct and low in cost (see Korean Patent Application Publication No. 10-2020-0088784, etc.).

[0005] However, the density of the existing high-density polyethylene (HDPE) resin composition used for geocells and coral cells is about 1.0 g / cm 3 Below, thereby floating in water, there may be a situation where its function is lost.

[0006] Therefore, there is a demand for the development of a composite resin composition having a higher density and excellent mechanical properties such as tensile strength and elongation compared to the existing polyethylene resin compositions for geocells or coral cells. Summary of the Invention

[0007] An object of the present invention is to provide a composite resin composition for geocells or coral cells having high density and excellent mechanical properties such as tensile strength and elongation.

[0008] According to one embodiment of the present invention for achieving the above-mentioned object, a composite resin composition is provided, comprising, based on the total weight of components (A) to (C), (A) 70.0 to 88.0 wt% of a high-density polyethylene resin; (B) 10.0 to 30.0 wt% of calcium carbonate; and (C) 2.0 to 4.0 wt% of a modified polyolefin resin, and having a density of 1.0 to 1.2 g / cm 3 .

[0009] In a specific embodiment of the present invention, the composite resin composition comprises, based on the total weight of components (A) to (C), 77.0 to 82.0 wt% of (A) high-density polyethylene resin; 15.0 to 20.0 wt% of (B) calcium carbonate; and 2.5 to 3.0 wt% of (C) modified polyolefin resin, and the density may be 1.04 to 1.10 g / cm 3 .

[0010] In a specific example of the present invention, the melt index (MI) of the composite resin composition measured at 190°C with a load of 2.16 kg is 2.16 ) is 0.1 to 0.3 g / 10 minutes, and the melt index (MI) is measured at 190°C with a load of 21.6 kg. 21.6 ) and the melt index (MI) measured with a load of 2.16 kg 2.16 ) ratio (melt flow ratio; MFR) can be 80-120.

[0011] In a specific embodiment of the present invention, the density of the high-density polyethylene resin (A) is 0.930 to 0.960 g / cm 3 , melt index (MI) measured at 190°C with a load of 2.16 kg 2.16 ) is 0.1 to 1.0 g / 10 minutes, and the melt index (MI) is measured at 190°C with a load of 21.6 kg. 21.6 ) and the melt index (MI) measured with a load of 2.16 kg 2.16 ) ratio (MFR) can be 60 to 140.

[0012] In a specific example of the present invention, the average particle size of calcium carbonate may be 2.0 to 5.0 μm.

[0013] In a specific example of the present invention, the modified polyolefin resin (C) may be maleic anhydride-grafted polyethylene.

[0014] In this case, the content of maleic anhydride in the modified polyolefin resin (C) may be 0.3 to 2.0% by weight.

[0015] In a specific embodiment of the present invention, the composite resin composition may further contain an additive (D) in an amount of 3 parts by weight or less relative to 100 parts by weight of components (A) to (C). In this case, the additive (D) may be at least one selected from the group consisting of an antioxidant, a neutralizer, a reinforcing agent, a weathering stabilizer, an antistatic agent, a lubricant, a slip agent, carbon black, a pigment, and a dye.

[0016] According to another embodiment of the present invention, there is provided a composite resin molded article obtained by molding the composite resin composition, wherein the density of the composite resin molded article is 1.0 to 1.2 g / cm 3 , tensile strength is 150~300kgf / cm 2 , the elongation is 300-600%.

[0017] In a specific example of the present invention, the composite resin molded article may be a sheet or a film.

[0018] The composite resin composition according to the specific example of the present invention has a high density and excellent mechanical properties such as tensile strength and elongation, and can be effectively used for the production of geocells or coral cells. DETAILED DESCRIPTION

[0019] Hereinafter, the present invention will be described in more detail.

[0020] Composite resin composition

[0021] According to one embodiment of the present invention, a composite resin composition is provided, comprising, based on the total weight of components (A) to (C), (A) 70.0 to 88.0 wt% of a high-density polyethylene resin; (B) 10.0 to 30.0 wt% of calcium carbonate; and (C) 2.0 to 4.0 wt% of a modified polyolefin resin, and having a density of 1.0 to 1.2 g / cm 3 .

[0022] According to a preferred embodiment of the present invention, a composite resin composition is provided, which comprises, based on the total weight of components (A) to (C), (A) 77.0 to 82.0 weight percent of a high-density polyethylene resin; (B) 15.0 to 20.0 weight percent of calcium carbonate; and (C) 2.5 to 3.0 weight percent of a modified polyolefin resin, and has a density of 1.04 to 1.10 g / cm 3 .

[0023] (A) High-density polyethylene resin

[0024] The composite resin composition according to a specific embodiment of the present invention comprises 70.0 to 88.0% by weight, preferably 75 to 85% or 77.0 to 82.0% by weight, of a high-density polyethylene resin (A), based on the total weight of components (A) to (C). If the content of the high-density polyethylene resin (A) is less than 70.0% by weight, it may be difficult to produce a molded article from the composite resin composition, or the elongation of the molded article obtained from the composite resin composition may decrease. Conversely, if the content of the high-density polyethylene resin (A) exceeds 88.0% by weight, the mechanical properties of the molded article, such as tensile strength, may decrease.

[0025] Here, the method for making high-density polyethylene resin (A) is not particularly limited, can use the manufacture method of high-density polyethylene resin known in the technical field of the present invention intact or suitably deformed.For example, can make by gas phase polymerization, solution polymerization or slurry polymerization etc.Preferably, the polymerization of ethylene monomer can be implemented by gas phase polymerization, specifically, the polymerization of ethylene monomer can be implemented in gas phase fluidized bed reactor.

[0026] In a specific embodiment of the present invention, the density of the high-density polyethylene resin (A) can be 0.930 to 0.960 g / cm 3 Preferably, the density of the high-density polyethylene resin (A) can be 0.935 to 0.950 g / cm 3 When the density of the high-density polyethylene resin (A) is within this range, a high-density polyethylene resin having a density of 1.0 g / cm 3 A composite resin composition having a density above .

[0027] In a specific embodiment of the present invention, the melt index (MI) of the high-density polyethylene resin (A) measured at 190°C with a load of 2.16 kg is 2.16 ) can be 0.1 to 1.0 g / 10 minutes. Preferably, the melt index of the high-density polyethylene resin (A), measured at 190°C under a load of 2.16 kg, can be 0.1 to 0.5 g / 10 minutes. When the melt index of the high-density polyethylene resin (A) is within this range, the composite resin composition has sufficient processability, and molded articles produced therefrom can have excellent mechanical properties.

[0028] In a specific embodiment of the present invention, the melt index (MI) of the high-density polyethylene resin (A) measured at 190°C with a load of 21.6 kg is 21.6 ) and the melt index (MI) measured with a load of 2.16 kg 2.16 ) ratio (MFR) may be 60 to 140. Preferably, the MFR of the high-density polyethylene resin (A) may be 70 to 130. When the MFR of the high-density polyethylene resin (A) is within this range, the processability of the composite resin composition may be sufficient.

[0029] (B) Calcium carbonate

[0030] The composite resin composition according to a specific embodiment of the present invention contains 10.0 to 30.0% by weight, preferably 13.0 to 22.0% by weight or 15.0 to 20.0% by weight of calcium carbonate (B), based on the total weight of components (A) to (C). If the content of calcium carbonate (B) is less than 10.0% by weight, the mechanical properties such as tensile strength of the molded article obtained from the composite resin composition may be reduced. Conversely, if the content of calcium carbonate (B) exceeds 30.0% by weight, the production of the molded article may be difficult or the elongation of the molded article may be reduced.

[0031] In a specific embodiment of the present invention, the average particle size of calcium carbonate can be 2.0 to 5.0 μm. When the average particle size of calcium carbonate (C) is within this range, the dispersion in the resin matrix is ​​improved, which is effective in improving the mechanical properties of the molded product.

[0032] In order to prevent the degradation of the mechanical properties of the molded product, the cohesion between the inorganic material and the high-density polyethylene resin should be strengthened to prevent the migration of the inorganic material. To this end, modified polyolefin resin can be used as a compatibilizer. The cohesion can be enhanced through hydrogen bonding between the carboxyl groups of the modified polyolefin resin and the hydroxyl groups of calcium carbonate.

[0033] In addition, the olefin chains of the modified polyolefin form physical entanglements with the chains of the high-density polyethylene, thereby increasing thermal stability and preventing a decrease in tensile strength and elongation of the composite resin composition.

[0034] (C) Modified polyolefin resin

[0035] The composite resin composition according to a specific embodiment of the present invention comprises 2.0 to 4.0% by weight, preferably 2.5 to 3.5% by weight or 2.5 to 3.0% by weight, of the modified polyolefin resin (C), based on the total weight of components (A) to (C). Increasing the content of the modified polyolefin resin (C) improves the compatibility between the high-density polyethylene resin (A) and the calcium carbonate (B). However, if the content exceeds 4.0% by weight, the mechanical properties, such as tensile strength, of a molded article produced from the composite resin composition may decrease.

[0036] In a specific example of the present invention, the modified polyolefin resin (C) may be maleic anhydride-grafted polyethylene. In this case, the maleic anhydride-grafted polyethylene may be produced by gas phase polymerization.

[0037] Here, the content of maleic anhydride in the modified polyolefin resin (C) can be 0.3 to 2.0 wt%. When the grafting rate of maleic anhydride is within this range, the effect of improving the adhesion to polar substrates can be obtained. In an exemplary embodiment, the maleic anhydride grafted polyethylene contained in the composite resin composition of the present invention can be obtained by grafting maleic anhydride onto a polyethylene having a density of 0.91 to 0.97 g / cm 3 , and is made of polyethylene with a melt index of 0.2 to 1.5 g / 10 minutes.

[0038] (D) Additives

[0039] The composite resin composition according to a specific example of the present invention may further contain an additive (D) in an amount of 3 parts by weight or less relative to 100 parts by weight of the components (A) to (C).

[0040] In a specific example, the additive (D) may be at least one selected from, for example, antioxidants, neutralizers, reinforcing agents, weather stabilizers, antistatic agents, lubricants, slip agents, carbon black, pigments, and dyes, but is not limited thereto.

[0041] In an exemplary embodiment, the additive (D) may include at least one antioxidant selected from the group consisting of a primary antioxidant, i.e., a phenolic antioxidant, such as BHT (butylated hydroxytoluene), Irganox 1076, Irganox 1010, and Irganox 3114, which removes free radicals and improves thermal stability during processing; and a secondary antioxidant, i.e., a phosphorus antioxidant, such as Irgafos 168, which decomposes peroxides generated by the primary antioxidant.

[0042] In this case, the antioxidant may be included in an amount of 0.01 to 1 part by weight, preferably 0.05 to 0.5 parts by weight, based on 100 parts by weight of the composite resin composition. If the antioxidant content is less than 0.01 parts by weight, it is difficult to ensure the antioxidant effect of the composite resin composition. If it exceeds 1 part by weight, the increase in antioxidant effect is minimal, and the cost-effectiveness of the composite resin composition may be reduced, which is not preferred.

[0043] The density of the composite resin composition according to a specific example of the present invention containing the above components is 1.0 to 1.2 g / cm 3 Preferably, the density of the composite resin composition may be 1.04 to 1.10 g / cm 3 or 1.05~1.09g / cm 3When the density of the composite resin composition is within this range, the geocell or coral cell obtained by processing a sheet produced therefrom does not float in water, and thus can maintain its function.

[0044] In a specific example of the present invention, the melt index (MI) of the composite resin composition measured at 190°C with a load of 2.16 kg is 2.16 ) can be 0.1 to 0.3 g / 10 minutes. Preferably, the melt index of the composite resin composition, measured at 190°C under a load of 2.16 kg, can be 0.1 to 0.2 g / 10 minutes. When the melt index of the composite resin composition is within this range, the composite resin composition has sufficient processability, and the mechanical properties of molded articles produced therefrom can be excellent.

[0045] In a specific example of the present invention, the melt index (MI) of the composite resin composition measured at 190°C with a load of 21.6 kg is 21.6 ) and the melt index (MI) measured with a load of 2.16 kg 2.16 ) ratio (melt flow ratio; MFR) can be 80 to 120. Preferably, the MFR of the composite resin composition can be 85 to 110 or 90 to 110. When the MFR of the composite resin composition is within this range, the processability of the composite resin composition can be sufficient.

[0046] The method for producing the composite resin composition of the present invention is not particularly limited. Methods for producing composite resin compositions known in the art to which the present invention pertains may be used as is or with appropriate modifications. The resin components described above may be freely selected and mixed in a desired order without particular restrictions. Specifically, for example, the composite resin composition of the present invention may be produced by adding the desired amounts of the resins and additives mentioned above to a kneader, roll, Banbury mixer, or single-screw or twin-screw extruder, and then mixing the raw materials using these machines.

[0047] Preferably, the above-mentioned resins and additives are melt-mixed in a twin-screw extruder at a temperature of 60 to 210° C. and pelletized.

[0048] Composite resin molded products

[0049] According to another embodiment of the present invention, there is provided a composite resin molded article produced by molding the composite resin composition of the present invention.

[0050] The method for producing a molded article from the composite resin composition according to the specific example of the present invention is not particularly limited, and methods known in the art of the present invention can be used. For example, the composite resin composition according to the specific example of the present invention can be molded by conventional methods such as injection molding, extrusion molding, casting molding, and melt-blowing molding to produce a composite resin molded article.

[0051] In a specific embodiment of the present invention, the composite resin molded article is an extrusion molded article or a cast molded article. More specifically, the composite resin molded article is a sheet or a film, and more specifically, the composite resin molded article is a sheet for geocells or coral cells.

[0052] In a specific embodiment of the present invention, the density of the composite resin molded article is 1.0 to 1.2 g / cm 3 Preferably, the density of the composite resin molded product can be 1.04 to 1.10 g / cm 3 or 1.05~1.09g / cm 3 When the density of the composite resin molded product is within this range, the geocell or coral cell obtained by processing the composite resin molded product does not float in water and can maintain its function.

[0053] In addition, the tensile strength of composite resin molded products is 150 to 300 kgf / cm 2 Preferably, the tensile strength of the composite resin molded product is 200 to 270 kgf / cm 2 When the tensile strength of the composite resin molded product is within this range, the geocell or coral cell obtained by processing the composite resin molded product will not deform under external forces and can maintain its function.

[0054] Furthermore, the elongation of the composite resin molded article is 300-600%. Preferably, the elongation of the composite resin molded article is 350-550%. When the elongation of the composite resin molded article is within this range, the geocell or coral cell obtained by processing the composite resin molded article will not break under external forces and will maintain its function.

[0055] Modes for Carrying Out the Invention

[0056] Example

[0057] The present invention will be described in more detail below by way of examples and comparative examples. However, the following examples are merely illustrative of the present invention and the scope of the present invention is not limited thereto.

[0058] The resins and compounds shown below were used in Examples and Comparative Examples.

[0059] A1: High-density polyethylene (Hanwha Solutions, 9031; density 0.944 g / cm 3 , melt index 0.2g / 10min, MFR 113)

[0060] B1: calcium carbonate (KOCH, CMS8000; average particle size 3.0 μm)

[0061] B2: Talc (KOCH, KC5000L; average particle size 3.0 μm)

[0062] C1: Maleic anhydride grafted polyethylene resin (Lotte Chemical, Adpoly EM101, maleic anhydride content 0.5-1.0 wt%)

[0063] Manufacturing Example

[0064] Resins and compounds of the types and contents (unit: parts by weight) shown in Table 1 below were melt-mixed and pelletized in a twin-screw extruder at 60-210° C. Inorganic fillers were added from the side of the middle of the extruder to maintain its shape.

[0065] Then, a sheet having a thickness of 2 mm was produced using a molding press at 190° C. and 30 bar, and then a specimen for physical property measurement was produced using an ASTM D638 specimen cutter.

[0066] [Table 1]

[0067]

[0068] Experimental example

[0069] The physical properties of the compositions and molded articles of Examples and Comparative Examples were measured by the following methods. The results are shown in Table 2 below.

[0070] (1) Density

[0071] The measurement was performed according to ASTM D1505.

[0072] (2) Melt index and melt flow ratio (MFR)

[0073] According to ASTM D 1238, the melt index was measured at 190°C with a load of 21.6 kg and a load of 2.16 kg, and the ratio (MI 21.6 / MI 2.16 ).

[0074] (3) Tensile strength and elongation

[0075] The measurement was performed at 200 mm / min according to ASTM D638.

[0076] [Table 2]

[0077]

[0078] As confirmed from Tables 1 and 2 above, the samples produced from the composite resin compositions of Examples falling within the scope of the present invention had high density and were excellent in tensile strength and elongation.

[0079] In contrast, the test specimens produced from the composite resin compositions of Comparative Examples that fall outside the scope of the present invention were inferior in at least one of density, tensile strength, and elongation.

[0080] Specifically, for Comparative Example 1, which has a high HDPE content, a low calcium carbonate content, and no modified polyolefin resin, the sample exhibited poor density and tensile strength. For Comparative Example 2, which has a high HDPE content and a low calcium carbonate content, the sample exhibited poor density. For Comparative Example 3, which has a high HDPE content and no modified polyolefin resin, the sample exhibited poor tensile strength and elongation. For Comparative Example 4, which did not use a modified polyolefin resin, the sample exhibited poor tensile strength and elongation. For Comparative Example 5, which has a high HDPE content, uses talc instead of calcium carbonate, and does not use a modified polyolefin resin, the sample exhibited poor density and elongation. For Comparative Example 6, which uses talc instead of calcium carbonate, the sample exhibited poor density and elongation.

[0081] Industrial application possibilities

[0082] Therefore, the composite resin composition according to the embodiment within the scope of the present invention has high density and excellent tensile strength and elongation, so the molded article produced therefrom, specifically, the sheet produced therefrom can be effectively used for manufacturing geocells or coral cells.

Claims

1. A composite resin composition comprising, based on the total weight of components (A) to (C), 75.0 to 85 wt% of (A) a high-density polyethylene resin; 13.0 to 22.0 wt% of (B) calcium carbonate; and 2.0 to 4.0 wt% of (C) a modified polyolefin resin, and having a density of 1.04 to 1.10 g / cm 3 , in, The modified polyolefin resin (C) is maleic anhydride grafted polyethylene. The average particle size of calcium carbonate is 2.0 to 5.0 μm.

2. The composite resin composition according to claim 1, wherein The melt index measured at 190°C with a load of 2.16 kg is 0.1 to 0.3 g / 10 minutes, and the ratio of the melt index measured at 190°C with a load of 21.6 kg to the melt index measured with a load of 2.16 kg is 80 to 120.

3. The composite resin composition according to claim 1, wherein The density of high-density polyethylene resin (A) is 0.930-0.960 g / cm 3 The melt index measured at 190°C with a load of 2.16 kg is 0.1-1.0 g / 10 minutes, and the ratio of the melt index measured at 190°C with a load of 21.6 kg to the melt index measured with a load of 2.16 kg is 60-140.

4. The composite resin composition according to claim 1, wherein The content of maleic anhydride in the modified polyolefin resin (C) is 0.3 to 2.0% by weight.

5. The composite resin composition according to claim 1, wherein The additive (D) is further contained in an amount of 3 parts by weight or less relative to 100 parts by weight of the components (A) to (C). The composite resin composition according to claim 5 , wherein The additive (D) is at least one selected from the group consisting of an antioxidant, a neutralizer, a reinforcing agent, an antistatic agent, a lubricant, a pigment, and a dye.

7. A composite resin molded article obtained by molding the composite resin composition according to any one of claims 1 to 6, wherein the composite resin molded article has a density of 1.04 to 1.10 g / cm 3 , tensile strength is 150~300kgf / cm 2 , the elongation is 300-600%.

8. The composite resin molded article according to claim 7, wherein The composite resin molded product is a sheet or film.

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