Scratch-resistant high-impact pc alloy material, and preparation method and application thereof

Abstract

The application relates to a scratch-resistant high-impact PC alloy material and a preparation method and application thereof, and comprises the following components and weight contents: 40-60 parts of PC resin, 25-40 parts of PBT resin, 5-10 parts of a surface modifier, 5-10 parts of a composite toughening agent, 1-2 parts of a compatilizer and 0.1-1 parts of other additives. The preparation method is that the components are uniformly stirred in a mixing barrel, and are added into an extruder through a main feeding port of a double-screw extruder; the surface modifier is added into the extruder through a side feeding port of the extruder under pressure, and is granulated through extrusion to obtain a scratch-resistant high-impact PC alloy material. Compared with the prior art, the addition of the PBT resin and the surface modifier greatly improves the overall scratch resistance of the PC base material; and the addition of the composite toughening agent improves the impact resistance of the material. The PC alloy material prepared by the method has good appearance, high surface hardness and high notched impact strength, can be widely applied to small household appliance shells, automobile interior parts and other products, is low in cost and has a wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of polymer molding and processing technology, and in particular relates to a scratch-resistant and high-impact PC alloy material, its preparation method and application. Background Technology

[0002] PC resin possesses properties such as transparency, high impact resistance, and high heat resistance, making it widely used in products such as appliance housings and automotive interior parts. However, because PC resin has relatively low surface hardness, it is easily scratched, causing appearance defects. Therefore, post-processing such as spraying and hardening is required, preventing its direct application to exterior surfaces. Thus, there is a need to develop a scratch-resistant and high-impact PC alloy material. Summary of the Invention

[0003] The purpose of this invention is to overcome the defects of the prior art and provide a scratch-resistant, high-impact PC alloy material, its preparation method, and its application.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A scratch-resistant and high-impact PC alloy material, comprising the following components and their weight percentages:

[0006]

[0007] Preferably, the PC resin has a relative molecular weight of 15,000-30,000 g / mol and a glass transition temperature of 140-150°C.

[0008] Preferably, the intrinsic viscosity η of the PBT resin is 0.8-1.2.

[0009] Preferably, the surface modifier is a composite of PMMA resin, hyperbranched polyester, and silane coupling agent, with the weight ratio of the components being (95-97):(2-3):(1-2).

[0010] Preferably, the hyperbranched polyester is a hydroxyl-terminated hyperbranched polyester with a branching degree of 50%-80% and a molecular weight of 500-2000 g / mol.

[0011] Preferably, the silane coupling agent includes one or more of γ-aminopropyltrimethoxysilane (KH540), γ-aminopropyltriethoxysilane (KH550), or 3-aminopropyltrimethoxysilane (KH551).

[0012] Preferably, the composite toughening agent includes one or more of MBS, silane rubber, or core-shell silicone toughening agents.

[0013] Preferably, the compatibilizer is AS-GMA, wherein the GMA content is 0.5-3 wt%.

[0014] This invention also provides a method for preparing a scratch-resistant, high-impact PC alloy material, comprising the following steps:

[0015] (a) Weigh out the PC resin, PBT resin, composite toughening agent, compatibilizer, and other additives and add them to a mixer for premixing;

[0016] (b) The mixed material in (a) is added to the extruder through the main feed port of the extruder, and the surface modifier is added to the extruder under pressure through the side feed port of the extruder. After blending, melting, extrusion and granulation, a scratch-resistant and high-impact PC alloy material is obtained.

[0017] Preferably, in step (b), the barrel temperature of the twin-screw extruder is 240-290℃, the screw speed is 200-600rpm, and the pressure is 1.5-2.5MPa.

[0018] This invention also provides an application of scratch-resistant, high-impact PC alloy material in the fields of appliance housings and automotive interior parts.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) This invention improves the crystallinity of the material by adding PBT resin, thereby enhancing the overall scratch resistance of the substrate. The surface modifier is added to the extruder through the side feed port, allowing it to disperse on the substrate surface and further improving the scratch resistance. The PMMA component has high surface hardness, which directly improves scratch resistance. Furthermore, the combination of hyperbranched polyester and silane coupling agent improves the compatibility of PMMA and PC, ensuring their uniform distribution on the product surface and further enhancing scratch resistance.

[0021] (2) Since the composite toughening agent has high compatibility with the substrate, the impact resistance of the material is improved by adding the rubber-like composite toughening agent to absorb impact energy.

[0022] (3) The PC alloy material obtained by improving the PC material formula has a good appearance, high surface hardness, and high notched impact strength. It can be widely used in products such as small household appliance shells and automotive interior parts. At the same time, it is inexpensive and has a wide range of application prospects. Detailed Implementation

[0023] The embodiments of the present invention will be described in detail below. The following embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0024] The raw materials used in the following examples and comparative examples are as follows: PBT resin with a viscosity of 1.0, produced by Changchun Chemical; PC resin, produced by Asahi Kasei L-1250Y; surface modifier, a composite of PMMA resin, hyperbranched polyester, and silane coupling agent, with a weight ratio of 96:2:2, wherein the hyperbranched polyester is HyPer C100 with a branching degree of 80%, and the silane coupling agent is KH550; composite toughening agent, MBS and core-shell silicon-based toughening agent, with a weight ratio of 50:50, wherein MBS is EM500, produced by LG, and the core-shell silicon-based toughening agent is S-2001, produced by Mitsubishi Rayon; compatibilizer, produced by Rizhisheng Fine Chemicals, with a GMA content of 1 wt%; other additives include antioxidant B900 (Ciba Specialty Chemicals), ultraviolet absorber Tinuvins UVP (Ciba), and lubricant barium stearate, with a weight ratio of 1:1:1.

[0025] Example 1:

[0026] This embodiment provides a scratch-resistant, high-impact PC alloy material and its preparation method, with the specific steps as follows:

[0027] (a) Weigh the PC resin, PBT resin, composite toughening agent, compatibilizer and other additives according to the formula in Table 1 and add them to the mixer for premixing.

[0028] (b) The mixed material in (a) is added to the twin-screw extruder through the main feed port of the twin-screw extruder. The surface modifier is weighed according to Table 1 and added to the twin-screw extruder under pressure through the side feed port of the extruder. After blending, melting, extrusion and granulation, a scratch-resistant and high-impact PC alloy material is obtained.

[0029] The 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 twin-screw extruder has a feed section temperature of 240℃, a plasticizing section temperature of 270℃, a homogenizing section temperature of 290℃, a screw speed of 400 rpm, and a pressure of 2.5 MPa.

[0030] Example 2:

[0031] This embodiment provides a scratch-resistant, high-impact PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 1, and the preparation method is the same as in Embodiment 1.

[0032] Example 3:

[0033] This embodiment provides a scratch-resistant, high-impact PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 1, and the preparation method is the same as in Embodiment 1.

[0034] The present invention also provides the following comparative examples to demonstrate the beneficial effects of the embodiments of the present invention.

[0035] Comparative Example 1:

[0036] This comparative example provides a PC alloy material and its preparation method, the difference being that no surface modifier is added. The weight ratio of the raw materials is shown in Table 1, and the preparation method is the same as in Example 1.

[0037] Comparative Example 2:

[0038] This comparative example provides a PC alloy material and its preparation method, the difference being that no composite toughening agent is added. The weight ratio of the raw materials is shown in Table 1, and the preparation method is the same as in Example 1.

[0039] Comparative Example 3:

[0040] This comparative example provides a PC alloy material and its preparation method, the difference being that PBT resin is not added. The weight ratio of the raw materials is shown in Table 1, and the preparation method is the same as in Example 1.

[0041] Table 1

[0042] PBT resin 25 25 40 25 25 0 PC resin 60 55 45 60 60 60 Surface modifier 5 10 5 0 5 5 Composite toughening agent 10 20 10 10 0 10 compatibilizer 1 1 1 1 1 1 Additives 1 1 1 1 1 1

[0043] The scratch-resistant, high-impact 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 scratch resistance testing. The abrasion resistance was assessed according to Shenlong D42-1172 standards, using a 2.4kg weight load applied to a 140*90*3mm high-gloss sample before rubbing it back and forth, followed by grayscale rating. Specific test standards and conditions are shown in Table 2.

[0044] Table 2

[0045] Izod notched impact strength (1 / 8) (J / m) 23℃ ASTM D256-10 Flexural modulus (MPa) 3mm / min ASTM D790-10 Abrasion and scratch resistance rating 2.4kg D42-1172

[0046] Note: "The higher the scratch resistance rating, the worse the material's scratch resistance."

[0047] The physical properties and light resistance test results of the PC resins in Examples 1-3 and Comparative Examples 1-3 are shown in Table 3 below.

[0048] Table 3

[0049]

[0050] The test results of Examples 1-3 and Comparative Examples 1-3 in Table 3 show that the addition of PBT resin improved the crystallinity of the material, significantly reduced the scratch resistance level, and improved the overall scratch resistance of the substrate. Simultaneously, the addition of the surface modifier dispersed it on the substrate surface, further enhancing the scratch resistance of the PC alloy material. The composite toughening agent exhibits high compatibility with the substrate, and its addition to the formulation significantly improves the impact resistance of the PC alloy material. In summary, this invention achieves the preparation of a scratch-resistant and high-impact PC alloy material by adding PBT resin, a surface modifier, and a composite toughening agent to the PC plastic formulation, resulting in a significant improvement in its scratch resistance and impact resistance.

[0051] 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 scratch-resistant, high-impact PC alloy material, characterized in that, Includes the following components and their weight percentages: 40-60 parts of PC resin 25-40 parts of PBT resin, 5-10 parts of surface modifier, 10-30 parts of composite toughening agent, 1-2 parts compatibilizer Other adjuvants: 0.1-1 part; The surface modifier is a composite of PMMA resin, hyperbranched polyester, and silane coupling agent; The weight ratio of the composite of PMMA resin, hyperbranched polyester, and silane coupling agent is (95-97): (2-3):(1-2); The composite toughening agent is MBS and a core-shell silicon-based toughening agent; the compatibilizer is AS-GMA, wherein the GMA content is 0.5-3 wt%.

2. The scratch-resistant, high-impact PC alloy material according to claim 1, characterized in that, The PC resin has a relative molecular weight of 15,000-30,000 g / mol and a glass transition temperature of 140-150℃.

3. The scratch-resistant, high-impact PC alloy material according to claim 1, characterized in that, The intrinsic viscosity of the PBT resin is 0.8-1.

2.

4. The scratch-resistant, high-impact PC alloy material according to claim 1, characterized in that, The hyperbranched polyester is a hydroxyl-terminated hyperbranched polyester with a branching degree of 50%-80% and a molecular weight of 500-2000 g / mol.

5. The scratch-resistant, high-impact PC alloy material according to claim 1, characterized in that, The silane coupling agent includes one or more of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, or 3-aminopropyltrimethoxysilane.

6. A method for preparing a scratch-resistant, high-impact PC alloy material as described in any one of claims 1-5, characterized in that, Includes the following steps: (a) Weigh the PC resin, PBT resin, composite toughening agent, compatibilizer, and other additives and add them to a mixer for premixing; (b) The mixed material in (a) is added to the extruder through the main feed port of the twin-screw extruder, and the surface modifier is added to the extruder under pressure through the side feed port of the extruder. After blending, melting, extrusion and granulation, a scratch-resistant and high-impact PC alloy material is obtained.

7. The application of the scratch-resistant, high-impact PC alloy material as described in claim 1 in the fields of appliance housings and automotive interior parts.

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