Wear-resistant pc alloy material and preparation method thereof

Abstract

The application relates to the field of polymer blending and polymer forming processing, and particularly relates to a wear-resistant PC alloy material and a preparation method thereof. The material comprises the following components in parts by weight: PC resin: 40-70 parts; modified PSF-PBT copolymer: 25-40 parts; toughening agent: 5-10 parts; lubricant, antioxidant and ultraviolet absorber: 0.1-1 part. Compared with the prior art, the application greatly improves the wear resistance of the material, the PBT section slightly ester-exchanges with the base material PC resin, the compatibility of the two is enhanced, and the appearance of the product is good.

Description

Technical Field

[0001] This invention relates to the fields of polymer blending and polymer molding, specifically to a wear-resistant PC alloy material and its preparation method. Background Technology

[0002] PC resin is widely used in various small household appliances, automotive interiors and other products due to its excellent impact resistance. However, because PC material has low surface hardness, it is easily worn during use and requires post-processing such as spraying, which limits its application range.

[0003] Chinese patent application CN107805380A discloses a formula for a wear-resistant PC material. The formula contains a lot of additives and salts, the product composition is relatively complex, and its performance and effect have not been tested, resulting in poor applicability.

[0004] Chinese patent CN115109403B discloses a high-strength wear-resistant PC material and its preparation process. First, microcrystalline cellulose is used as a raw material to prepare nanoscale nanocrystalline cellulose. Under the activation of 1-ethyl-(3-dimethylaminopropyl)carbodiimide, the hydroxyl groups on the surface of the nanocrystalline cellulose are replaced with epoxy groups. Under catalytic conditions, it reacts with high-pressure CO2 gas to achieve ring-opening of the epoxy groups, obtaining modified nanocrystalline cellulose with carbonate monomers. Then, a diol compound is used to generate polycarbonate, allowing the modified nanocrystalline cellulose to be effectively dispersed in the polycarbonate matrix and enhancing its binding ability. This disperses the stress applied to the polycarbonate surface, avoiding damage caused by stress concentration, thereby effectively enhancing the wear resistance and strength of the polycarbonate. However, this production process has problems such as cumbersome processing, making it unsuitable for large-scale mass production. Furthermore, the production process requires high-pressure conditions, which has certain limitations. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology by providing a wear-resistant PC alloy material and its preparation method. By adding a modified PSF-PBT copolymer, the wear resistance of the material is significantly improved due to the effect of the PSF component. Furthermore, the PBT segment undergoes slight transesterification with the substrate PC resin, thereby enhancing their compatibility and preventing delamination, ensuring a good product appearance. This process is simple and convenient, and the prepared material exhibits excellent appearance and surface wear resistance, as well as high notched impact strength. It can be widely used in products such as small household appliance housings and automotive interior parts, showing broad application prospects.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A wear-resistant PC alloy material, characterized in that the material comprises the following components in parts by weight:

[0008]

[0009] Furthermore, the relative molecular weight of the PC resin is 15,000-30,000.

[0010] Furthermore, the toughening agent includes one or more of methyl methacrylate, butadiene, styrene terpolymer, silane rubber, or core-shell silicone toughening agents.

[0011] Furthermore, the modified PSF-PBT copolymer is prepared by dissolving bisphenol A polysulfone, terephthaloyl chloride and 1,4-butanediol in an organic solvent, reacting, cooling and transferring the reaction product to a methanol solution to precipitate the copolymer, allowing it to stand, washing and drying to obtain the modified PSF-PBT copolymer.

[0012] Furthermore, the mass ratio of bisphenol A polysulfone, terephthaloyl chloride and 1,4-butanediol is 50:(4-5):1, and the mass ratio of the organic solvent to terephthaloyl chloride is 500:(4-5).

[0013] Furthermore, the organic solvent includes one or more of acetone, chlorobenzene, and trichlorobenzene.

[0014] Furthermore, the additives include lubricants, antioxidants, and ultraviolet absorbers, wherein the mass ratio of the lubricant, antioxidant, and ultraviolet absorber is 1:1:(1-1.1).

[0015] A method for preparing a wear-resistant PC alloy material, characterized by comprising the following steps:

[0016] The modified PSF-PBT copolymer, PC resin, toughening agent, and additives are mixed evenly in a mixing tank, and then extruded and granulated in a twin-screw extruder to obtain the wear-resistant PC alloy material.

[0017] Furthermore, the barrel temperature of the twin-screw extruder is 240-290℃, the screw speed is 200-600rpm, and the extrusion pressure is 1.5-2.5MPa.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] This invention incorporates a modified PSF-PBT copolymer. Due to the effect of the PSF component, the wear resistance of the material is significantly improved. At the same time, the PBT segment undergoes slight ester exchange with the substrate PC resin, enhancing the compatibility between the two and preventing stratification and precipitation, thus ensuring a good product appearance.

[0020] The material prepared by this invention has excellent appearance and surface wear resistance, and high notched impact strength. It can be widely used in products such as small household appliance shells and automotive interior parts, and has broad application prospects. Detailed Implementation

[0021] The present invention will now be described in detail with reference to specific embodiments.

[0022] The raw materials used in the following examples and comparative examples are:

[0023] The PC resin used is Asahi Kasei's L-1250Y;

[0024] Bisphenol A polysulfone (PSF), purchased from Hubei Kewode Chemical Co., Ltd.;

[0025] Terephthaloyl chloride, 1,4-butanediol, and trichlorobenzene are chemically pure and commercially available.

[0026] The toughening agent is MBS and a core-shell silicon-based toughening agent with a mass ratio of 50:50. The MBS used is EM500, LG, and the core-shell silicon-based toughening agent used is S-2001, Mitsubishi Rayon.

[0027] The additives include antioxidant B900 (Ciba Specialty Chemicals), ultraviolet absorber Tinuvins UVP (Ciba), and lubricant barium stearate, with a weight ratio of 1:1:1 for each additive.

[0028] The following embodiments are implemented based on the above-described technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments.

[0029] The following are more detailed implementation examples, which further illustrate the technical solution of the present invention and the technical effects that can be obtained.

[0030] In the following embodiments, unless otherwise specified, the raw materials, reagents or processing techniques are all conventional commercial products or conventional processing techniques in the art.

[0031] Example 1

[0032] This embodiment provides a wear-resistant PC alloy material and its preparation method. The preparation steps are as follows:

[0033] (1) Preparation of modified PSF-PBT copolymer: Bisphenol A polysulfone, terephthaloyl chloride, and 1,4-butanediol were added to trichlorobenzene (the mass ratio of trichlorobenzene to bisphenol A polysulfone, terephthaloyl chloride, and 1,4-butanediol was 500:50:5:1) and dissolved. The mixture was heated to 200℃ and reacted for 4 hours. After cooling, the reaction product was transferred to a methanol solution, and the copolymer was precipitated. After standing overnight, it was washed twice with methanol, then boiled and washed three times with deionized water, dried, and stored for later use.

[0034] (2) The prepared modified PSF-PBT copolymer and the remaining components are mixed evenly in a mixing tank according to the proportion (see Table 1), and fed into the main feed of a twin-screw extruder. The sample is obtained by melt extrusion, cooling, drying and pelletizing. The twin-screw extruder is a co-rotating twin-screw extruder with a screw length-to-diameter ratio of 40:1. The screw barrel is equipped with a vacuum extraction device and a temperature control device. The temperature of the feeding section of the twin-screw extruder is 240℃, the temperature of the plasticizing section is 270℃, the temperature of the homogenizing section is 290℃, the screw speed is 400rpm, and the pressure is 2.5MPa.

[0035] Example 2

[0036] This embodiment provides a wear-resistant PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 1. Other preparation methods are the same as in Embodiment 1.

[0037] Example 3

[0038] This embodiment provides a wear-resistant PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 1. Other preparation methods are the same as in Embodiment 1.

[0039] Comparative Example 1

[0040] This comparative example provides a wear-resistant PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 1, and other preparation methods are the same as in Example 1.

[0041] Comparative Example 2

[0042] This comparative example provides a wear-resistant PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 1, and other preparation methods are the same as in Example 1.

[0043] Comparative Example 3

[0044] This comparative example provides a wear-resistant PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 1. The preparation method of this comparative example is different from that of Example 1 in that PSF, terephthaloyl chloride, and 1,4-butanediol are not pre-reacted, but are directly added to each component and directly extruded to obtain the extruded material.

[0045] Table 1. Raw material weight ratio of Examples 1-3 and Comparative Examples 1-3

[0046]

[0047]

[0048] Performance Testing: The wear-resistant PC alloy materials prepared in Examples 1-3 and Comparative Examples 1-3 were dried at 80℃ for 5 hours. Their physical properties were then tested using injection-molded test strips according to ASTM standards. High-gloss samples with injection molded dimensions of 160*90*3mm were used for wear resistance testing. The wear resistance performance was tested according to Volkswagen's PV3975 standard, including gloss retention rate, and surface condition was observed. Specific testing standards and conditions are shown in Table 2.

[0049] Table 2 Test Standards and Test Conditions

[0050] Izod notched impact strength (1 / 8) (J / m) 23℃ ASTM D256-10 Flexural modulus (MPa) 3mm / min ASTM D790-10 Abrasion resistance and gloss retention rate (%) 23℃ PV3975

[0051] Note: "The higher the scratch resistance rating, the worse the material's wear resistance."

[0052] The physical properties and abrasion resistance results of the PC resins in Examples 1-3 and Comparative Examples 1-3 are shown in Table 3 below.

[0053] Table 3. Physical properties and abrasion resistance results of PC resins in Examples 1-3 and Comparative Examples 1-3.

[0054]

[0055] The test results of Examples 1-3 and Comparative Examples 1-3 in Table 3 show that the addition of the modified PSF-PBT copolymer significantly improves the wear resistance of the material due to the effect of the PSF component. Furthermore, the PBT segment undergoes slight transesterification with the substrate PC resin, enhancing their compatibility and preventing delamination, thus ensuring a good product appearance. This material has a good appearance, excellent surface wear resistance, and high notched impact strength, making it widely applicable in products such as small appliance housings and automotive interior parts, with broad application prospects.

[0056] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A wear-resistant PC alloy material, characterized in that, The material comprises the following components in parts by weight: 40-70 parts of PC resin; 25-40 parts of modified PSF-PBT copolymer; 5-10 parts toughening agent; 0.1-1 part of auxiliary agent; The toughening agent is MBS and a core-shell silicon-based toughening agent.

2. The wear-resistant PC alloy material according to claim 1, characterized in that, The relative molecular weight of the PC resin is 15,000-30,000.

3. The wear-resistant PC alloy material according to claim 1, characterized in that, The modified PSF-PBT copolymer is prepared by dissolving bisphenol A polysulfone, terephthaloyl chloride and 1,4-butanediol in an organic solvent, reacting, cooling and transferring the reaction product to a methanol solution to precipitate the copolymer, allowing it to stand, washing and drying to obtain the modified PSF-PBT copolymer.

4. The wear-resistant PC alloy material according to claim 3, characterized in that, The mass ratio of bisphenol A polysulfone, terephthaloyl chloride and 1,4-butanediol is 50:(4-5):1, and the mass ratio of organic solvent to terephthaloyl chloride is 500:(4-5).

5. The wear-resistant PC alloy material according to claim 3, characterized in that, The organic solvent includes one or more of acetone, chlorobenzene, and trichlorobenzene.

6. The wear-resistant PC alloy material according to claim 1, characterized in that, The additives include lubricants, antioxidants, and ultraviolet absorbers, wherein the mass ratio of the lubricant, antioxidant, and ultraviolet absorber is 1:1:(1-1.1).

7. The wear-resistant PC alloy material according to claim 6, characterized in that, The mass ratio of the lubricant, antioxidant, and ultraviolet absorber is 1:1:

1.

8. A method for preparing a wear-resistant PC alloy material as described in any one of claims 1-7, characterized in that, Includes the following steps: The modified PSF-PBT copolymer is mixed with PC resin, toughening agent and additives, and then extruded and granulated in a twin-screw extruder to obtain the wear-resistant PC alloy material.

9. The method for preparing the wear-resistant PC alloy material according to claim 8, characterized in that, The twin-screw extruder has a barrel temperature of 240-290℃, a screw speed of 200-600rpm, and an extrusion pressure of 1.5-2.5MPa.

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