High-wear-resistance polyester material and preparation method thereof

Abstract

The invention relates to a high-wear-resistance polyester material and a preparation method thereof. The high-wear-resistance polyester material is prepared from the following components in percentage by mass: 95-99.9% of polyester, 0.4-4.9% of a cross-linking agent and the balance of a catalyst. By adding the catalyst and the cross-linking agent, the reaction between the functional group of the cross-linking agent and the terminal group of the polyester is promoted by using the catalyst at high temperature, so that the polyester is subjected to chain extension and cross-linking, the molecular weight of the polyester is improved, and the performance and the wear resistance of the polyester are greatly improved; compared with a polyester material using a wear-resistant auxiliary agent, the polyester material provided by the invention has the advantages of equivalent normal temperature performance and lower cost.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a highly wear-resistant polyester material and a preparation method thereof. Background Art

[0002] Polyester is one of the most widely used engineering materials in the market. It is widely used in packaging bags, mineral water bottles and other packaging fields. However, it is extremely important to maintain the appearance of the packaging material, which requires the polyester material to have excellent wear resistance. At present, wear-resistant additives are mainly added to polyester materials to improve the wear resistance of polyester materials. However, the addition of most wear-resistant additives will affect the transparency of polyester materials, which is not conducive to the further expansion of the use of polyester materials in the packaging field. Summary of the invention

[0003] Based on this, in order to solve the technical problem that the wear resistance of polyester materials is currently improved by adding wear-resistant additives, but the addition of wear-resistant additives will affect the transparency of polyester materials, which is not conducive to the further expansion and utilization of polyester materials in the packaging field, the present invention provides a high wear-resistant polyester material and a preparation method thereof.

[0004] The invention provides a highly wear-resistant polyester material, which is prepared from the following components in percentage by mass: 95%-99.9% polyester, 0.4%-4.9% cross-linking agent, and the remainder catalyst.

[0005] The present invention adds a catalyst and a cross-linking agent, and utilizes the catalyst to promote the reaction of the functional groups of the cross-linking agent with the terminal groups of the polyester under high temperature conditions, so as to extend the polyester chain and cross-link the polyester, thereby increasing the molecular weight of the polyester, thereby greatly improving the performance and wear resistance of the polyester; compared with polyester materials using wear-resistant additives, the polyester material of the present invention has equivalent performance at room temperature and lower cost.

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

[0007] As a further improvement of the above solution of the present invention, the crosslinking agent is glycidyl ester. A catalyst is used to promote the reaction of the epoxy functional group of glycidyl ester with the terminal group of polyester at high temperature to extend the chain and crosslink, thereby improving the performance and wear resistance of polyester.

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

[0009] The present invention provides a method for preparing the above-mentioned highly wear-resistant polyester material, which comprises the following steps: after uniformly mixing polyester, a crosslinking agent and a catalyst in proportion, putting them into an extruder for extrusion to obtain the highly wear-resistant polyester material.

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

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

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

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

[0014] 1. The present invention adds a catalyst and a cross-linking agent, and utilizes the catalyst to promote the reaction of the functional groups of the cross-linking agent with the terminal groups of the polyester under high temperature conditions, so as to extend the polyester chain and cross-link the polyester, thereby increasing the molecular weight of the polyester, thereby greatly improving the performance and wear resistance of the polyester; compared with the polyester material using the wear-resistant additive, the polyester material of the present invention has equivalent performance at room temperature and lower cost.

[0015] 2. The method provided by the present invention is applicable to various types of polyesters and has excellent universality; the method of the present invention uses low-cost raw materials, is easy to operate, and is suitable for large-scale industrial use. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

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

[0020] Polybutylene terephthalate PBT: KH2100 produced by Kanghui, KH2083 produced by Kanghui, 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] The above raw materials can all be obtained commercially. The above raw materials are only for illustrating the sources and components of the reagents used in the experiments of the present invention so as to fully disclose the information. It does not mean that the present 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 the present invention are conventional reagents, methods and equipment in the present technical field.

[0027] Example 1

[0028] This embodiment provides a highly wear-resistant polyester material, which includes the following component raw materials in percentage by weight: 98 wt % of PBT (KH2083), 1.8 wt % of TGIC, and 0.2 wt % of DMAP.

[0029] The preparation method of the high wear-resistant polyester material of the present embodiment comprises the following steps: PBT (KH2083), TGIC, and DMAP are put into a blender in proportion and mixed evenly, and then the mixture is poured into a twin-screw extruder at a temperature of 240° C. and a rotation speed of 200 r / min, and the mixture is reacted by high temperature and screw shearing action, and pellets are prepared by extrusion, cooling, and pelletizing, namely, the high wear-resistant polyester material. The microstructure of the high wear-resistant polyester material after chain extension by TGIC and DMAP in the present embodiment is as follows: Figure 1 After the pellets were mixed evenly with 1.5wt% of black masterbatch, injection molding was performed in an injection molding machine at 250°C to obtain a sample.

[0030] Example 2

[0031] This embodiment provides a highly wear-resistant polyester material, which includes the following component raw materials in percentage by weight: 95 wt % of PBT (KH2083), 4 wt % of TGIC, and 1 wt % of DMAP.

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

[0033] Example 3

[0034] This embodiment provides a highly wear-resistant polyester material, which includes the following component raw materials in percentage by weight: 95 wt % of PBT (KH2100), 4 wt % of TGIC, and 1 wt % of DMAP.

[0035] The preparation method of the high wear-resistant polyester material of this embodiment comprises the following steps: PBT (KH2100), TGIC, and DMAP are put into a blender in proportion and mixed evenly, and then the mixture is poured into a twin-screw extruder at a temperature of 240° C. and a rotation speed of 300 r / min, and the mixture is reacted by high temperature and screw shearing action, and pellets are prepared by extrusion, cooling, and pelletizing, that is, the high wear-resistant polyester material. The pellets are mixed evenly with 1.5wt% of 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 highly wear-resistant polyester material, which includes the following component raw materials in percentage by weight: 48wt% of PBT (KH2083), 45wt% of PBT (KH2100), 5wt% of PET (FG600), 1.8wt% of TGIC, and 0.2wt% of DMAP.

[0038] The preparation method of the high wear-resistant polyester material of this embodiment comprises the following steps: PBT (KH2083), PBT (KH2100), PET (FG600), TGIC, and DMAP are put into a blender in proportion and mixed evenly, and then the mixture is poured into a twin-screw extruder at a temperature of 240° C. and a rotation speed of 350 r / min, and the mixture is reacted by high temperature and screw shearing action, and pellets are prepared by extrusion, cooling, and pelletizing, that is, the high wear-resistant polyester material. After the pellets are evenly mixed with 1.5wt% black masterbatch, injection molding is performed in an injection molding machine at 260° C. to obtain a sample.

[0039] Example 5

[0040] This embodiment provides a highly wear-resistant polyester material, which includes the following component raw materials in percentage by weight: 99.5wt% of PBT (1100-211M), 0.4wt% of TGIC, and 0.1wt% of DMAP.

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

[0042] Example 6

[0043] This embodiment provides a highly wear-resistant polyester material, which includes the following component raw materials in percentage by mass: 99.5wt% of PET (FG600), 0.4wt% of TGIC, and 0.1wt% of DMAP.

[0044] The preparation method of the high wear-resistant polyester material of this embodiment comprises the following steps: PET (FG600), TGIC, and DMAP are put into a blender in proportion and mixed evenly, and then the mixture is poured into a twin-screw extruder at a temperature of 280° C. and a rotation speed of 350 r / min, and the mixture is reacted by high temperature and screw shearing action, and pellets are prepared by extrusion, cooling, and pelletizing, that is, the high wear-resistant polyester material. The pellets are mixed evenly with 1.5wt% of black masterbatch, and then injection molded in an injection molding machine at 280° C. to obtain a sample.

[0045] Example 7

[0046] This embodiment provides a highly wear-resistant polyester material, which includes the following component raw materials in percentage by weight: 99 wt % of PET (BG80), 0.8 wt % of TGIC, and 0.2 wt % of DMAP.

[0047] The preparation method of the high wear-resistant polyester material of this embodiment comprises the following steps: PET (BG80), TGIC, and DMAP are put into a blender in proportion and mixed evenly, and then the mixture is poured into a twin-screw extruder at a temperature of 290° C. and a rotation speed of 200 r / min, and the mixture is reacted by high temperature and screw shearing action, and pellets are prepared by extrusion, cooling, and pelletizing, that is, the high wear-resistant polyester material. After the pellets are evenly mixed with 1.5wt% black masterbatch, injection molding is performed in an injection molding machine at 270° C. to obtain a sample.

[0048] Example 8

[0049] This embodiment provides a highly wear-resistant polyester material, which includes the following component raw materials in percentage by weight: 99 wt % of PET (BG80), 0.8 wt % of diglycidyl ester, and 0.2 wt % of DMAP.

[0050] The preparation method of the high wear-resistant polyester material of this embodiment comprises the following steps: PET (BG80), diglycidyl ester, and DMAP are put into a blender in proportion and mixed evenly, and then the mixture is poured into a twin-screw extruder at a temperature of 290° C. and a rotation speed of 200 r / min, and the mixture is reacted by high temperature and screw shearing action, and pellets are prepared by extrusion, cooling, and pelletizing, that is, the high wear-resistant polyester material. After the pellets are evenly mixed with 1.5wt% black masterbatch, injection molding is performed in an injection molding machine at 270° C. to obtain a sample.

[0051] Comparative Example 1

[0052] This comparative example proposes a highly wear-resistant polyester material, which includes the following component raw materials in percentage by mass: 100wt% of PBT (KH2083).

[0053] The preparation method of the high wear-resistant polyester material of this embodiment comprises 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, and reacts by high temperature and screw shearing action, and pellets are prepared by extrusion, cooling, and pelletizing, namely the high wear-resistant polyester material. The pellets are mixed evenly with 1.5wt% of black masterbatch, and then injection molded in an injection molding machine at 250°C to obtain a sample.

[0054] Comparative Example 2

[0055] This comparative example proposes a highly wear-resistant polyester material, which includes the following component raw materials in percentage by mass: 100wt% of PBT (KH2100).

[0056] The preparation method of the high wear-resistant polyester material of this embodiment comprises 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, and reacted by high temperature and screw shearing action, and pellets are prepared by extrusion, cooling, and pelletizing, namely the high wear-resistant polyester material. The pellets are mixed evenly with 1.5wt% of black masterbatch, and then injection molded in an injection molding machine at 260°C to obtain a sample.

[0057] Comparative Example 3

[0058] This comparative example proposes a highly wear-resistant polyester material, which includes the following component raw materials in percentage by mass: 100wt% of PBT (1100-211M).

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

[0060] Comparative Example 4

[0061] This comparative example proposes a highly wear-resistant polyester material, which includes the following component raw materials in percentage by mass: 100wt% of PET (FG600).

[0062] The preparation method of the high wear-resistant polyester material of this embodiment comprises the following steps: pouring PET (FG600) into a twin-screw extruder at a temperature of 280°C and a rotation speed of 350r / min, causing it to react by high temperature and screw shearing action, and preparing pellets by extrusion, cooling, and pelletizing, namely the high wear-resistant polyester material. After the pellets are uniformly mixed with 1.5wt% of black masterbatch, injection molding is performed in an injection molding machine at 280°C to obtain a sample.

[0063] Comparative Example 5

[0064] This comparative example proposes a highly wear-resistant polyester material, which includes the following component raw materials in percentage by mass: 100wt% of PET (BG80).

[0065] The preparation method of the high wear-resistant polyester material of this embodiment comprises the following steps: pouring PET (BG80) into a twin-screw extruder at a temperature of 290°C and a rotation speed of 200r / min, causing it to react by high temperature and screw shearing action, and preparing pellets by extrusion, cooling, and pelletizing, namely the high wear-resistant polyester material. After the pellets are uniformly mixed with 1.5wt% of black masterbatch, injection molding is performed in an injection molding machine at 270°C to obtain a sample.

[0066] Test Case

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

[0068] Color difference change before and after cross scratching: Use a colorimeter 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] Izod beam notched impact: standard GB 1843.1;

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

[0073] Table 1 Performance test results

[0074]

[0075] It can be seen from the results in Table 1 that 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 can be clearly seen that adding a catalyst and a cross-linking agent and using the catalyst to promote the reaction of the functional groups of the cross-linking agent with the terminal groups of the polyester at high temperature, so as to extend the chain of the polyester and cross-link it, and increase the molecular weight of the polyester, can effectively improve the scratch resistance of the polyester material.

[0076] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A highly wear-resistant polyester material, characterized in that: The invention is prepared from the following components in percentage by mass: 95%-99.9% polyester, 0.4%-4.9% crosslinking agent, and the remainder catalyst.

2. The highly wear-resistant polyester material according to claim 1, characterized in that: The polyester is at least one of polylactic acid, polybutylene terephthalate-adipate, polybutylene terephthalate and polyethylene terephthalate.

3. The highly wear-resistant polyester material according to claim 1, characterized in that: The crosslinking agent is glycidyl ester.

4. The highly wear-resistant polyester material according to claim 1, characterized in that: The catalyst is 4-dimethylaminopyridine or triphenylphosphine.

5. A method for preparing a highly wear-resistant polyester material as claimed in any one of claims 1 to 4, characterized in that: It includes the following steps: After the polyester, the cross-linking agent and the catalyst are uniformly mixed in proportion, the mixture is put into an extruder for extrusion to obtain a highly wear-resistant polyester material.

6. The method for preparing a highly wear-resistant polyester material according to claim 5, characterized in that: The extruder is a twin-screw extruder.

7. The method for preparing a highly wear-resistant polyester material according to claim 6, characterized in that: The extrusion temperature of the twin-screw extruder is 230-300°C.

8. The method for preparing a highly wear-resistant polyester material according to claim 6, characterized in that: The rotation speed of the twin-screw extruder is 200-400r / min.

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