A high abrasion-resistant polyester material and its preparation method

Abstract

This invention relates to a high-wear-resistant polyester material and its preparation method. The high-wear-resistant polyester material is prepared from the following components by mass percentage: 95%-99.9% polyester, 0.4%-4.9% crosslinking agent, and the balance being a catalyst. This invention, by adding a catalyst and a crosslinking agent, utilizes the catalyst to promote the reaction between the functional groups of the crosslinking agent and the terminal groups of the polyester at high temperatures, thereby extending and crosslinking the polyester chain, increasing the molecular weight of the polyester, and thus significantly improving the polyester's performance and wear resistance. Compared to polyester materials using wear-resistant additives, the polyester material of this invention has comparable room-temperature performance and is at a lower cost.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a high wear-resistant polyester material and its preparation method. Background Technology

[0002] Polyester is one of the most widely used engineering materials on the market, with extensive applications in packaging bags, mineral water bottles, and other packaging fields. However, maintaining the aesthetic appearance of packaging materials is crucial, requiring polyester to possess excellent abrasion resistance. Currently, this is mainly achieved by adding abrasion-resistant additives to polyester to improve its abrasion resistance. However, the addition of most abrasion-resistant additives can affect the transparency of polyester, which hinders its further expansion and utilization in the packaging field. Summary of the Invention

[0003] Based on this, and addressing the technical problem that current methods improve the abrasion resistance of polyester materials by adding abrasion-resistant additives, but the addition of abrasion-resistant additives affects the transparency of polyester materials, which is not conducive to the further expansion and utilization of polyester materials in the packaging field, this invention provides a high abrasion-resistant polyester material and its preparation method.

[0004] The present invention provides a high wear-resistant polyester material, which is prepared from the following components in mass percentage: 95%-99.9% polyester, 0.4%-4.9% crosslinking agent, and the balance being a catalyst.

[0005] This invention adds a catalyst and a crosslinking agent. The catalyst promotes the reaction between the functional groups of the crosslinking agent and the terminal groups of the polyester at high temperatures, thereby extending and crosslinking the polyester chain, increasing the molecular weight of the polyester, and thus significantly improving the polyester's performance and wear resistance. Compared with polyester materials using wear-resistant additives, the polyester material of this invention has comparable room temperature performance and lower cost.

[0006] As a further improvement to the above-mentioned solution of the present invention, the polyester is at least one of polylactic acid, polybutylene terephthalate, polybutylene terephthalate, and polyethylene terephthalate.

[0007] As a further improvement to the above-described scheme of the present invention, the crosslinking agent is glycidyl ester. A catalyst is used to promote the reaction between the epoxy functional groups of the glycidyl ester and the terminal groups of the polyester at high temperature, thereby extending its chain, crosslinking it, and improving the polyester's properties and abrasion resistance.

[0008] As a further improvement to the above-described scheme of the present invention, the catalyst is 4-dimethylaminopyridine or triphenylphosphine.

[0009] The present invention proposes a method for preparing the high abrasion-resistant polyester material as described above, which includes the following steps: mixing polyester, crosslinking agent and catalyst in proportion and then extruding them in an extruder to obtain the high abrasion-resistant polyester material.

[0010] As a further improvement to the above-described solution of the present invention, the extruder is a twin-screw extruder.

[0011] As a further improvement to the above-mentioned solution of the present invention, the extrusion temperature of the twin-screw extruder is 230-300℃.

[0012] As a further improvement to the above-mentioned solution of the present invention, the rotational speed of the twin-screw extruder is 200-400 r / min.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This invention adds a catalyst and a crosslinking agent. The catalyst promotes the reaction between the functional groups of the crosslinking agent and the terminal groups of the polyester at high temperature, thereby extending and crosslinking the polyester chain, increasing the molecular weight of the polyester, and thus significantly improving the polyester performance and wear resistance. Compared with polyester materials using wear-resistant additives, the polyester material of this invention has comparable room temperature performance and lower cost.

[0015] 2. The method provided by this invention is applicable to various types of polyesters and has excellent versatility; the method of this invention uses low-cost raw materials and is easy to operate, making it suitable for large-scale industrial use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the microstructure of the high wear-resistant polyester material according to an embodiment of the present invention. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0019] The specific information on the raw materials used in the following examples and comparative examples is as follows:

[0020] Polybutylene terephthalate (PBT): KH2100 and KH2083 produced by Kanghui Chemical, and 1100-211M produced by Changchun Chemical.

[0021] Polyethylene terephthalate (PET): FG600 and BG80 produced by Yizheng Chemical Fiber;

[0022] Triglycidyl ester (TGIC): Produced by Shanghai Aladdin Biochemical Technology Co., Ltd.

[0023] Diglycidyl ester: Produced by Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0024] 4-Dimethylaminopyridine (DMAP): Produced by Shanghai Aladdin Biochemical Technology Co., Ltd.

[0025] All of the above-mentioned raw materials are commercially available. The above-mentioned raw materials are only used to illustrate the source and composition of the reagents used in the experiments of this invention, so as to fully disclose them, and do not mean that the invention cannot be achieved by using other similar reagents or reagents provided by other suppliers.

[0026] Unless otherwise specified, the reagents, methods and equipment used in this invention are conventional reagents, methods and equipment in this technical field.

[0027] Example 1

[0028] This embodiment proposes a high abrasion-resistant polyester material, which comprises the following raw materials in weight percentage: 98 wt% PBT (KH2083), 1.8 wt% TGIC, and 0.2 wt% DMAP.

[0029] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PBT (KH2083), TGIC, and DMAP are mixed evenly in a blender in a certain proportion. Then, the mixture is poured into a twin-screw extruder at a temperature of 240°C and a speed of 200 r / min. The mixture reacts under high temperature and screw shearing action. The granules are then prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The microstructure of the high abrasion-resistant polyester material after chain extension by TGIC and DMAP in this embodiment is as follows: Figure 1 As shown. After the granules were mixed evenly with 1.5 wt% black masterbatch, they were injection molded in an injection molding machine at 250℃ to obtain the sample.

[0030] Example 2

[0031] This embodiment proposes a high abrasion-resistant polyester material, which comprises the following raw materials in weight percentage: 95 wt% PBT (KH2083), 4 wt% TGIC, and 1 wt% DMAP.

[0032] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PBT (KH2083), TGIC, and DMAP are mixed evenly in a blender according to a certain ratio. Then, the mixture is poured into a twin-screw extruder at a temperature of 250°C and a rotation speed of 300 r / min. The mixture reacts under high temperature and screw shearing action. The granules are then prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The granules are mixed evenly with 1.5 wt% black masterbatch and then injection molded in an injection molding machine at 210°C to obtain a sample.

[0033] Example 3

[0034] This embodiment proposes a high abrasion-resistant polyester material, which comprises the following raw materials in weight percentage: 95 wt% PBT (KH2100), 4 wt% TGIC, and 1 wt% DMAP.

[0035] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PBT (KH2100), TGIC, and DMAP are mixed evenly in a blender according to a certain ratio. Then, the mixture is poured into a twin-screw extruder at a temperature of 240°C and a rotation speed of 300 r / min. The mixture reacts under high temperature and screw shearing action. Granules are prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The granules are mixed evenly with 1.5 wt% black masterbatch and then injection molded in an injection molding machine at 250°C to obtain a sample.

[0036] Example 4

[0037] This embodiment proposes a high abrasion-resistant polyester material, which comprises the following raw materials in weight percentages: 48 wt% PBT (KH2083), 45 wt% PBT (KH2100), 5 wt% PET (FG600), 1.8 wt% TGIC, and 0.2 wt% DMAP.

[0038] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PBT (KH2083), PBT (KH2100), PET (FG600), TGIC, and DMAP are mixed evenly in a blender according to a certain ratio. Then, the mixture is poured into a twin-screw extruder at a temperature of 240°C and a speed of 350 r / min. The mixture reacts under high temperature and screw shearing action. The granules are then prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The granules are mixed evenly with 1.5 wt% black masterbatch and then injection molded in an injection molding machine at 260°C to obtain a sample.

[0039] Example 5

[0040] This embodiment proposes a high abrasion-resistant polyester material, which comprises the following raw materials in weight percentage: 99.5 wt% PBT (1100-211M), 0.4 wt% TGIC, and 0.1 wt% DMAP.

[0041] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PBT (1100-211M), TGIC, and DMAP are mixed evenly in a blender according to a certain ratio. Then, the mixture is poured into a twin-screw extruder at a temperature of 240°C and a speed of 300 r / min. The mixture reacts under high temperature and screw shearing action. The granules are then prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The granules are mixed evenly with 1.5 wt% black masterbatch and then injection molded in an injection molding machine at 270°C to obtain a sample.

[0042] Example 6

[0043] This embodiment proposes a high abrasion-resistant polyester material, which comprises the following raw materials in weight percentages: 99.5 wt% PET (FG600), 0.4 wt% TGIC, and 0.1 wt% DMAP.

[0044] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PET (FG600), TGIC, and DMAP are mixed evenly in a blender according to a certain ratio. The mixture is then poured into a twin-screw extruder at a temperature of 280°C and a rotation speed of 350 r / min. The mixture undergoes a reaction due to high temperature and screw shearing action. Granules are then prepared by extrusion, cooling, and pelletizing, which yields the high abrasion-resistant polyester material. The granules are then mixed evenly with 1.5 wt% black masterbatch and injection molded in an injection molding machine at 280°C to obtain a sample.

[0045] Example 7

[0046] This embodiment proposes a high abrasion-resistant polyester material, which comprises the following raw materials in weight percentages: 99 wt% PET (BG80), 0.8 wt% TGIC, and 0.2 wt% DMAP.

[0047] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PET (BG80), TGIC, and DMAP are mixed evenly in a blender according to a certain ratio. The mixture is then poured into a twin-screw extruder at a temperature of 290°C and a speed of 200 r / min. The mixture undergoes a reaction due to high temperature and screw shearing action. Granules are prepared by extrusion, cooling, and pelletizing, which yields the high abrasion-resistant polyester material. The granules are then mixed evenly with 1.5 wt% black masterbatch and injection molded in an injection molding machine at 270°C to obtain a sample.

[0048] Example 8

[0049] This embodiment proposes a high abrasion-resistant polyester material, which comprises the following raw materials in weight percentages: 99 wt% PET (BG80), 0.8 wt% diglycidyl ester, and 0.2 wt% DMAP.

[0050] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PET (BG80), diglycidyl ester, and DMAP are mixed evenly in a blender according to a certain ratio. The mixture is then poured into a twin-screw extruder at a temperature of 290°C and a rotation speed of 200 r / min. The mixture undergoes a reaction due to high temperature and screw shearing action. Granules are then prepared by extrusion, cooling, and pelletizing, which yields the high abrasion-resistant polyester material. The granules are then mixed evenly with 1.5 wt% black masterbatch and injection molded in an injection molding machine at 270°C to obtain a sample.

[0051] Comparative Example 1

[0052] This comparative example presents a high abrasion-resistant polyester material comprising the following component raw materials by mass percentage: 100 wt% PBT (KH2083).

[0053] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PBT (KH2083) is poured into a twin-screw extruder at a temperature of 240°C and a rotation speed of 200 r / min. The high temperature and screw shearing action cause a reaction. Granules are prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The granules are then mixed evenly with 1.5 wt% black masterbatch and injection molded in an injection molding machine at 250°C to obtain a sample.

[0054] Comparative Example 2

[0055] This comparative example presents a high abrasion-resistant polyester material comprising the following component raw materials by mass percentage: 100 wt% PBT (KH2100).

[0056] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PBT (KH2100) is poured into a twin-screw extruder at a temperature of 240°C and a rotation speed of 350 r / min. The high temperature and screw shearing action cause a reaction. Granules are prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The granules are then mixed evenly with 1.5 wt% black masterbatch and injection molded in an injection molding machine at 260°C to obtain a sample.

[0057] Comparative Example 3

[0058] This comparative example presents a high abrasion-resistant polyester material comprising the following component raw materials by mass percentage: 100 wt% PBT (1100-211M).

[0059] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PBT (1100-211M) is poured into a twin-screw extruder at a temperature of 260°C and a rotation speed of 250 r / min. The high temperature and screw shearing action cause a reaction. Granules are prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The granules are then mixed evenly with 1.5 wt% black masterbatch and injection molded in an injection molding machine at 270°C to obtain a sample.

[0060] Comparative Example 4

[0061] This comparative example presents a high abrasion-resistant polyester material comprising the following component raw materials by mass percentage: 100 wt% PET (FG600).

[0062] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PET (FG600) is poured into a twin-screw extruder at a temperature of 280℃ and a rotation speed of 350 r / min. The high temperature and screw shearing action cause a reaction. Granules are prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The granules are then mixed evenly with 1.5 wt% black masterbatch and injection molded in an injection molding machine at 280℃ to obtain a sample.

[0063] Comparative Example 5

[0064] This comparative example presents a high abrasion-resistant polyester material comprising the following component raw materials by mass percentage: 100 wt% PET (BG80).

[0065] The preparation method of the high abrasion-resistant polyester material in this embodiment includes the following steps: PET (BG80) is poured into a twin-screw extruder at a temperature of 290°C and a rotation speed of 200 r / min. The high temperature and screw shearing action cause a reaction. Granules are prepared by extrusion, cooling, and pelletizing, which is the high abrasion-resistant polyester material. The granules are then mixed evenly with 1.5 wt% black masterbatch and injection molded in an injection molding machine at 270°C to obtain a sample.

[0066] Test case

[0067] The samples obtained in Examples 1-8 and Comparative Examples 1-5 were subjected to the following performance tests:

[0068] Color difference change before and after cross-scraping: A colorimeter was used to determine the color difference change of the material before and after scratching;

[0069] Tensile strength: Standard GB 1040.2;

[0070] Bending strength: Standard GB 9341;

[0071] Cantilever beam notched impact: Standard GB 1843.1;

[0072] The degree of wear was determined by the change in color difference before and after cross-scraping. The test results are shown in Table 1.

[0073] Table 1 Performance Test Results

[0074]

[0075] As can be seen from the results in Table 1, by comparing Example 1 with Comparative Example 1, Example 3 with Comparative Example 2, Example 5 with Comparative Example 3, Example 6 with Comparative Example 4, and Examples 7-8 with Comparative Example 5, it is evident that the addition of catalysts and crosslinking agents, and the use of catalysts to promote the reaction between the functional groups of the crosslinking agent and the terminal groups of the polyester at high temperatures, thereby extending and crosslinking the polyester chain, increasing the molecular weight of the polyester, can effectively improve the scratch resistance of polyester materials.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high abrasion-resistant polyester material, characterized in that, It is prepared from the following components in weight percentage: 95%-99.5% polyester, 0.4%-4.9% crosslinking agent, and the balance being a catalyst, the amount of which is not zero; the catalyst is 4-dimethylaminopyridine; the polyester is at least one of polybutylene terephthalate and polyethylene terephthalate; the crosslinking agent is diglycidyl ester or TGIC; The preparation method of the high wear-resistant polyester material is as follows: after the polyester, crosslinking agent and catalyst are mixed evenly in proportion, they are fed into an extruder and extruded to obtain the high wear-resistant polyester material; the extruder is a twin-screw extruder and the extrusion temperature of the twin-screw extruder is 230-300℃.

2. A method for preparing the high abrasion-resistant polyester material as described in claim 1, characterized in that, It includes the following steps: After the polyester, crosslinking agent and catalyst are mixed evenly in a certain proportion, they are fed into an extruder and extruded to obtain a high wear-resistant polyester material. The extruder is a twin-screw extruder.

3. The method for preparing the high abrasion-resistant polyester material according to claim 2, characterized in that, The twin-screw extruder operates at a speed of 200-400 r / min.

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