Polypropylene material, method for preparing the same and use thereof

Abstract

The application relates to a polypropylene material and a preparation method and application thereof, and belongs to the technical field of high polymer materials. The polypropylene material comprises the following components in proportion by weight: 9-21 parts of PP resin, 4-16 parts of Surlyn resin, 68-82 parts of barium sulfate, 0.15-1.1 parts of an antioxidant and 0.05-1.1 parts of a lubricant; the melt flow rate of the PP resin is 110-150 g / 10 min under the condition of 230 DEG C and a 2.16 kg weight; and the crystallinity of the PP resin is 40%-70%. The PP resin with high melt flow index and high crystallinity is compounded with the Surlyn resin, the barium sulfate is added as a filler, and the lubricant is added, so that the scratch resistance of the polypropylene material is effectively improved, the polypropylene material has good appearance, and the use requirements of chip material, such as scratch resistance, good appearance and high density, are met.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a polypropylene material, its preparation method, and its applications. Background Technology

[0002] Chips are commonly used items in the entertainment industry. To ensure a comfortable feel, chips are typically designed and manufactured to have significant weight, a good appearance and texture, and good wear resistance and durability during use. Traditional chip materials are usually made of ceramic, metal, clay, and plastic. The most common type of chip on the market uses an internal metal sheet to increase weight, with an external coating of different colored polymer materials. This type of chip meets the weight requirements, and the external polymer coating is usually made of ABS, PP, or PA. Among these, PP resin is particularly advantageous as an outer coating material due to its excellent overall performance, textured surface, and low price.

[0003] In recent years, chips with embedded chips have emerged to facilitate identification and redemption. Since the presence of metal would hinder chip identification, metal materials cannot be placed in chip chips to increase weight. Instead, the density of the outer polymer material needs to be increased to meet the quality requirements of the chips. In addition, the chips need to tumble and collide in the sorting machine during the sorting process, which also puts high wear resistance requirements on the outer polymer material.

[0004] Therefore, there is an urgent need to prepare polymer materials with high fluidity, high filling capacity, and high wear resistance. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and to provide a polypropylene material, its preparation method, and its application.

[0006] This invention is achieved through the following technical solution:

[0007] In a first aspect, the present invention provides a polypropylene material, comprising, by weight, the following components: 9-21 parts PP resin, 4-16 parts Surlyn resin, 68-82 parts barium sulfate, 0.15-1.1 parts antioxidant, and 0.05-1.1 parts lubricant; wherein the PP resin has a melt flow rate of 110-150 g / 10 min at 230°C and with a 2.16 kg weight; and the PP resin has a crystallinity of 40%-70%.

[0008] This invention uses high melt flow index PP resin as the base material, which has high fluidity and ensures that the injection molded parts are free of defects such as insufficient glue. Furthermore, the high crystallinity of the PP resin effectively improves the material's hardness. Suryn resin is a derivative of ethylene-methacrylic acid copolymer (PEMA), possessing high strength and good toughness. In addition, Suryn resin has high wear resistance and scratch resistance, making it suitable for products with frequently contacted surfaces. Barium sulfate has high density and high thermal stability, and barium sulfate-filled PP materials have high gloss, resulting in a composite material with an excellent appearance. Further addition of a lubricant improves the scratch resistance of the material surface through its migration. This invention uses a high melt flow index PP resin compounded with Suryn resin, which effectively improves the hardness and scratch resistance of polypropylene materials. The addition of barium sulfate and lubricant further enhances the overall performance of the polypropylene material while giving it a good appearance, meeting the requirements for scratch resistance, good appearance, and high density in chip materials.

[0009] Specifically, the crystallinity test method for PP resin in this invention is differential scanning calorimetry, where crystallinity = (ΔHm / ΔHf) × 100%, ΔHm is the enthalpy of melting of the sample (i.e., the area of ​​the melting peak), and ΔHf is the theoretical enthalpy of melting of a fully crystalline substance.

[0010] Preferably, the polypropylene material comprises, by weight, the following components: 10-20 parts PP resin, 5-15 parts Surlyn resin, 70-80 parts barium sulfate, 0.2-1 parts antioxidant, and 0.1-1 parts lubricant.

[0011] In the polypropylene material of the present invention, the weight parts of PP resin are any one or a combination of 9 parts, 10 parts, 25 parts, 20 parts, and 21 parts.

[0012] Preferably, in the polypropylene material, the sum of the mass percentages of the PP resin and the Surlyn resin is not less than 20%.

[0013] Preferably, the crystallinity of the PP resin is 45%-70%; more preferably, the crystallinity of the PP resin is 50%-60%.

[0014] Preferably, the melt flow rate of the PP resin at 230°C and with a 2.16 kg weight is 110-140 g / 10 min.

[0015] Preferably, the mass ratio of the PP resin to the Surlyn resin is (0.6-4):1.

[0016] More preferably, the mass ratio of the PP resin to the Surlyn resin is (1-1.5):1.

[0017] Surlyn resin has excellent surface scratch resistance and abrasion resistance. When mixed and modified with PP resin, it significantly improves the scratch resistance of PP materials. At the same time, the excellent impact toughness of Surlyn resin improves the brittleness of PP composite materials, thereby improving the processing performance. This invention has found that when PP resin and the aforementioned Surlyn resin are in the above-mentioned mass ratio, polypropylene materials can have excellent comprehensive properties.

[0018] Preferably, the melt flow rate of the Surlyn resin at 190°C and with a 2.16 kg weight is 10-70 g / 10 min.

[0019] Preferably, the antioxidant includes hindered phenolic primary antioxidants and phosphite secondary antioxidants.

[0020] Preferably, the hindered phenolic primary antioxidant is antioxidant 1010, which is composed of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] in parts by weight of 0.01-0.5; the phosphite secondary antioxidant is antioxidant 168, which is composed of tris[2,4-di-tert-butylphenyl]phosphite in parts by weight of 0.01-0.5.

[0021] Preferably, the lubricant includes at least one of oleamide, erucamide, and silicone lubricants.

[0022] Preferably, the lubricant is added in the form of a masterbatch for easy processing and production, and the carrier of the masterbatch is acrylate and epoxy resin.

[0023] Preferably, the D50 particle size of the barium sulfate is 0.1 μm-20 μm.

[0024] Secondly, the present invention provides a method for preparing the polypropylene material, comprising the following steps: mixing the components evenly according to the stated weight parts, melting and extruding the mixture through a twin-screw extruder, granulating the mixture, and obtaining the polypropylene material.

[0025] The polypropylene material preparation method of this invention is simple and suitable for industrial production.

[0026] Thirdly, the present invention provides the application of the polypropylene material in chips.

[0027] The polypropylene material of this invention has high flowability, high filling capacity, and high abrasion resistance. It can protect the chip from damage during processing while meeting the requirements of scratch resistance, good appearance, and high density for chip materials.

[0028] The present invention has the following beneficial effects:

[0029] This invention produces a high-flow, highly filled, and highly wear-resistant polypropylene material by blending barium sulfate, Surlyn resin, a lubricant, and PP resin. Barium sulfate, with its high density, effectively increases the density of PP material at high filler contents. Furthermore, barium sulfate-filled PP material exhibits excellent gloss and a superior appearance. Surlyn resin possesses exceptional surface scratch and wear resistance; its blending with PP resin significantly improves the scratch resistance of the PP composite. The excellent impact toughness of Surlyn resin mitigates the brittleness of the PP composite, thereby improving its processing performance. In addition to Surlyn resin, the lubricant migrates to the material surface during use, increasing surface lubricity and further enhancing scratch resistance. This results in a polypropylene material with excellent scratch resistance, wear resistance, high density, and easy processing properties. Detailed Implementation

[0030] To better illustrate the objectives, technical solutions, and advantages of this invention, the invention will be further described below with reference to specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0031] Unless otherwise specified, the experimental methods used in the examples are conventional methods; the materials and reagents used are commercially available unless otherwise specified.

[0032] Examples 1-10

[0033] The composition of the polypropylene material described in the embodiments of the present invention is shown in Table 1.

[0034] The preparation method of the polypropylene material includes the following steps: mixing the components evenly according to the stated weight proportions, melting and extruding them at 200°C using a twin-screw extruder, granulating them, and obtaining the polypropylene material.

[0035] Comparative Examples 1-6

[0036] The only difference between Comparative Examples 1-6 and the Examples is the type and ratio of components, as shown in Table 2.

[0037] In the components described in each embodiment and comparative example,

[0038] The PP resin-1 is: PPH-MN150, produced by China Petroleum & Chemical Corporation Luoyang Branch, with a melt flow rate of 140 g / 10 min at 230℃ and 2.16 kg weight, and a crystallinity of 54%.

[0039] The PP resin-2 is PP BX3950, manufactured by SK Chemicals, with a melt flow rate of 130 g / 10 min at 230°C and a weight of 2.16 kg, and a crystallinity of 48%.

[0040] The PP resin-3 is: PP EP648V, Wanhua Chemical, with a melt flow rate of 110g / 10min at 230℃ and 2.16kg weight, and a crystallinity of 46%.

[0041] The PP resin-4 is PP K7100, manufactured by Yanshan Petrochemical, with a melt flow rate of 100g / 10min at 230℃ and a weight of 2.16kg, and a crystallinity of 41%.

[0042] The PP resin-5 is PP BX3920, manufactured by SK Chemicals, with a melt flow rate of 90 g / 10 min at 230°C and a weight of 2.16 kg, and a crystallinity of 44%.

[0043] The Surlyn resin-1 is: DOWXUS 68S81010, Dow Chemical, with a melt flow rate of 70 g / 10 min at 190°C and a weight of 2.16 kg.

[0044] The Surlyn resin-2 is Surlyn 1702, Dow Chemical, with a melt flow rate of 14 g / 10 min at 190 °C and a weight of 2.16 kg.

[0045] The Surlyn resin-3 is Surlyn 8660, Dow Chemical, with a melt flow rate of 10 g / 10 min at 190 °C and a weight of 2.16 kg.

[0046] The barium sulfate in question is AB-3000N1, manufactured by Guangzhou Huangpu Tiantai Chemical Light Industry Co., Ltd.

[0047] The talc powder is TYT-777A, manufactured by Haicheng Tianyuan Chemical Co., Ltd.

[0048] The antioxidant is a mixture of primary antioxidant 1010 and secondary antioxidant 168 in a mass ratio of 1:1, commercially available.

[0049] The lubricant is: oleamide, Crodamide VRX, and Croda (UK).

[0050] Unless otherwise specified, all components and raw materials used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0051] Table 1. Content of each component (parts) in the materials of Examples 1-10

[0052]

[0053] Table 2. Content of each component (parts) in the materials of Comparative Examples 1-6

[0054] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 PP resin-1 15 25 0 15 PP resin-4 15 PP resin-5 15 Surlyn Resin-1 10 10 10 0 25 10 Barium sulfate 75 75 75 75 75 talcum powder 75 antioxidants 0.5 0.5 0.5 0.5 0.5 0.5 lubricant 0.5 0.5 0.5 0.5 0.5

[0055] The polypropylene materials prepared in each embodiment and comparative example were subjected to the following performance tests, as detailed below:

[0056] 1. Notched impact strength of cantilever beam: ISO 180:2023.

[0057] 2. Density: ISO 1183-1:2019.

[0058] 3. Melt index: ISO 1133-1:2022.

[0059] 4. Rockwell hardness: ISO 868:2003;

[0060] 5. Cross-cutting test: ISO 2409:2020;

[0061] Color difference ΔE = [(△L)] in 100-grid cross-section test 2 +(△a) 2 +(△b) 2 ]^1 / 2,

[0062] L: Represents brightness, that is, the lightness or darkness of a color.

[0063] a and b: represent the opposite dimension of color, a represents the opposite of red and green, and b represents the opposite of yellow and blue.

[0064] A cross-cut test is performed on the sample surface with a fixed force of 4N. The color difference ΔE of the sample surface before and after the cross-cut test is measured by a colorimeter, and the scratch resistance of the material is evaluated. The smaller the color difference, the better the scratch resistance.

[0065] The test results are shown in Tables 3 and 4.

[0066] Table 3. Material property test results of Examples 1-10

[0067]

[0068] Table 4. Material property test results for Comparative Examples 1-6

[0069] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 <![CDATA[Izod impact strength of cantilever beam kJ / m 2 > 4.8 4.2 4.1 2.5 6.2 4.0 <![CDATA[Density g / cm 3 > 2.43 2.40 2.42 2.43 2.41 1.81 Melt index g / 10min 16.6 9.3 8.5 20.6 7.8 15.4 Rockwell hardness 93 92 91 98 82 95 100-square test (4N) ΔE 0.25 0.12 0.10 0.54 0.06 0.23

[0070] As can be seen from the test results in Table 3-4, the polypropylene material of this invention has high fluidity and good impact performance. During processing, it meets the material processability requirements of the chip mold and will not experience problems such as insufficient glue or material breakage at the gate during injection molding. The modified PP resin, formulated with Surlyn resin and lubricant, significantly improves the material's scratch resistance. The cantilever beam notched impact strength of the material is not less than 3 kJ / m. 2 The Rockwell hardness is not less than 85, and the color difference ΔE is less than 0.45 after a 100-cross test with a force of 4N.

[0071] As shown in Comparative Example 1, the absence of lubricant leads to a larger color difference in the cross-cut adhesion test and a decrease in the material's scratch resistance. In Comparative Examples 2 and 3, the melt index of the PP resin decreases, making it prone to molding problems such as insufficient resin and incomplete filling during the part processing, and also reducing the material's impact resistance. In Comparative Example 4, without the addition of Surlyn resin, the material's abrasion resistance does not meet the requirements, and its toughness is reduced, making it prone to material breakage at the gate during injection molding. In Comparative Example 5, using only Surlyn resin, the material's melt index decreases and the material becomes softer. In Comparative Example 6, compared to barium sulfate filler, talc powder as a filler increases density by a smaller proportion, and talc powder has a greater impact on the impact strength of PP.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polypropylene material, characterized in that, By weight, it includes the following components: The composition comprises 12.5-21 parts PP resin, 4-16 parts Surlyn resin, 68-75 parts barium sulfate, 0.15-1.1 parts antioxidant, and 0.05-1.1 parts lubricant; the melt flow rate of the PP resin at 230℃ and with a 2.16 kg weight is 110-150 g / 10 min; the crystallinity of the PP resin is 40%-70%; the mass ratio of the PP resin to the Surlyn resin is (1-1.5):1; and the melt flow rate of the Surlyn resin at 190℃ and with a 2.16 kg weight is 10-70 g / 10 min.

2. The polypropylene material according to claim 1, characterized in that, The antioxidants include hindered phenolic primary antioxidants and phosphite secondary antioxidants.

3. The polypropylene material according to claim 2, characterized in that, The hindered phenolic primary antioxidant includes pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

4. The polypropylene material according to claim 2, characterized in that, The phosphite-based auxiliary antioxidants include tris[2,4-di-tert-butylphenyl]phosphite.

5. The polypropylene material according to claim 1, characterized in that, The lubricant includes at least one of oleamide, erucamide, and silicone lubricants.

6. A method for preparing the polypropylene material according to any one of claims 1-5, characterized in that, Includes the following steps: The components are mixed evenly according to the stated weight proportions, melt-extruded through a twin-screw extruder, and granulated to obtain the polypropylene material.

7. The use of the polypropylene material according to any one of claims 1-5 in chips.

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