High-toughness and high-gloss piano black spraying-free weather-resistant PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) material and preparation method thereof

Abstract

The invention discloses a high-gloss piano black spraying-free and high-toughness weather-resistant PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) material which can be used for automotive interiors. The preparation method of the material comprises the following steps: 1) weighing 65%-75% of PC resin, 15%-25% of ABS resin, 1%-2% of antioxidant, 1%-3% of light stabilizer, 1%-2% of toner and 3%-5% of flexibilizer, adding into a high-speed mixer, and uniformly mixing; and 2) adding the mixed material into a main feeding port, and melting, homogenizing, extruding and granulating by an extruder to obtain a final product. According to the prepared high-gloss piano black spraying-free PC / ABS, the appearance effect of high-gloss piano black can be obtained through secondary injection molding, environmental pollution caused by a traditional spraying process is avoided, and perfect combination of environmental protection and aesthetics is achieved. Meanwhile, the material has good weather resistance, can meet the weather resistance requirement of the automotive trim, has the characteristics of high toughness, high heat resistance and high processability, and can be used as an exterior part without paint spraying for the automotive trim.

Description

Technical Field

[0001] The invention relates to the field of plastics with special appearance, and in particular to a high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material and a preparation method thereof. Background Art

[0002] As one of the important engineering plastic alloys, PC / ABS alloy has good impact resistance, high temperature resistance and excellent molding and processing performance, and is widely used in automotive parts. In recent years, consumers have paid more and more attention to the aesthetics of automobile appearance. The use of PC / ABS parts with high-gloss piano black as the color has improved the appearance texture of automobile interiors and has been well received by consumers. At present, the high-gloss piano black effect of automobile interiors is mostly obtained through the surface treatment process of traditional spraying. However, the spraying process involves multiple processes such as pretreatment and painting. Not only is the process complicated and the production cost high, but it also produces a large amount of volatile organic compounds and has a serious impact on the environment. With the rapid development of the automobile industry and the improvement of consumers' environmental awareness, the requirements for energy conservation and environmental protection of automobiles are also getting higher and higher, and the demand for spray-free materials is increasing. The high-gloss black PC / ABS material without spraying can obtain the appearance of high-gloss black through one-time injection molding, avoiding the environmental pollution caused by the traditional spraying process, achieving a perfect combination of environmental protection and aesthetics, and at the same time low comprehensive cost.

[0003] At present, the high-gloss piano black PC / ABS material is directly used as the product appearance, and its weather resistance (light aging) performance still needs further evaluation. Under the combined effects of light, heat, and oxygen during ultraviolet light irradiation, the main chain PC in the PC / ABS alloy will undergo Fries rearrangement, changing from a para structure to a meta structure that is easier to color; the double bonds of butadiene in the ABS component are destroyed, producing chromophores such as carbonyl. Because of its high gloss and blackness, the color difference of high-gloss piano black PC / ABS after light aging is more obvious, which limits the application of the material.

[0004] PC / ABS is a commonly used material for automotive interiors and is the preferred substrate for making high-gloss piano black. By selecting phosgene-process PC with a suitable melt flow rate and bulk-process ABS, adding suitable additives, and using suitable processing technology, a high-gloss piano black effect can be developed. PC / ABS materials with good toughness and weather resistance can be directly used for interior exterior parts, eliminating the need for painting and maintaining a good appearance. It can be used as a new type of exterior material. Summary of the invention

[0005] The present invention successfully prepares a PC / ABS material with a high-gloss piano black effect, which has good toughness and weather resistance, a special appearance and excellent comprehensive performance. It can be used for automotive interior exterior parts to achieve a special appearance effect, and the surface does not need to be painted, thereby achieving the effect of cost reduction and environmental protection.

[0006] To achieve the above purpose, the technical solution used in the present invention is as follows:

[0007] A high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material, prepared by the following components in percentage:

[0008] PC resin 65%-75%,

[0009] ABS resin 15%-25%,

[0010] Toughener 3%-5%,

[0011] Antioxidant 1%-2%,

[0012] Light stabilizer 1%-3%,

[0013] Color powder 1%-2%.

[0014] In a further embodiment, the PC resin is a phosgene-processed PC, and under the test conditions of 260° C.*5 kg, the melt flow rate needs to be ≥15 g / 10 min.

[0015] The ABS resin is a type of bulk ABS.

[0016] The toughening agent is acrylonitrile-butadiene-styrene graft copolymer, and the butadiene content is greater than 65%, and the compounding ratio of the toughening agent and the ethylene methyl acrylate copolymer is: acrylonitrile-butadiene-styrene graft copolymer: ethylene methyl acrylate copolymer = 2:1.

[0017] The antioxidant is a compound of antioxidant 1010 and antioxidant 168, and the compounding ratio is 1010:168=1:2.

[0018] The light stabilizer is a benzotriazole ultraviolet absorber.

[0019] The color powder can be matched according to actual needs. The color powder used in this patent is black masterbatch.

[0020] Another object of the present invention is to provide a method for preparing the above-mentioned high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material. After various required raw materials are evenly mixed in a high-speed mixer according to the ratio, they are added to the main feeding port of a twin-screw extruder, and after melt plasticization and shear mixing, they are extruded, water-cooled, and granulated.

[0021] The present invention has the following beneficial effects:

[0022] 1. In the present invention, suitable PC and ABS resins are selected and matched with suitable processes to develop a special appearance material with high-gloss piano black effect, which can be used for automobile interior appearance parts, and the surface does not need to be painted to achieve a high-gloss appearance effect.

[0023] 2. The toughening agent added in the present invention, especially the toughening agent used, has a certain volume expansion effect, which positively improves the thermal stability and toughness of the material and satisfies the basic mechanical properties as an automotive interior decoration part.

[0024] 3. The antioxidant and light stabilizer added in the present invention enable the material to meet the light resistance test requirements of automotive interior decoration parts.

[0025] 4. The preparation method of the present invention is to mix various required raw materials in a high-speed mixer according to the ratio, and then add them to the main feeding port of the twin-screw extruder. The appearance is good and the performance is stable and excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a product sample of high-gloss piano black spray-free PC / ABS. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the embodiments, but they are not intended to limit the present invention.

[0028] The manufacturers of the products used in the embodiments of the present invention are as follows: PC resin: Wanhua; ABS resin: Trinseo; toughening agent: Kumho, South Korea; antioxidant 1010 and antioxidant 168: BASF; light stabilizer: Tianjin Lianlong; color powder: homemade;

[0029] Embodiment 1:

[0030] PC resin 71%

[0031] ABS resin 20%

[0032] Toughener 5%

[0033] Antioxidant 2%

[0034] Light stabilizer 1%

[0035] Color powder 1%

[0036] After the various required raw materials are evenly mixed in a high-speed mixer, they are added to the main feeding port of the twin-screw extruder, melt-plasticized, sheared and mixed, and then extruded, water-cooled and granulated.

[0037] Embodiment 2:

[0038] PC resin 71%

[0039] ABS resin 20%

[0040] Toughener 5%

[0041] Antioxidant 2%

[0042] Light stabilizer 2%

[0043] Color powder 1%

[0044] After the various required raw materials are evenly mixed in a high-speed mixer, they are added to the main feeding port of the twin-screw extruder, melt-plasticized, sheared and mixed, and then extruded, water-cooled and granulated.

[0045] Embodiment 3:

[0046] PC resin 71%

[0047] ABS resin 20%

[0048] Toughener 5%

[0049] Antioxidant 2%

[0050] Light stabilizer 3%

[0051] Color powder 1%

[0052] After the various required raw materials are evenly mixed in a high-speed mixer, they are added to the main feeding port of the twin-screw extruder, melt-plasticized, sheared and mixed, and then extruded, water-cooled and granulated.

[0053] Comparative Example 1:

[0054] PC resin 71%

[0055] ABS resin 20%

[0056] Toughener 5%

[0057] Antioxidant 2%

[0058] Light stabilizer 0%

[0059] Color powder 1%

[0060] After the various required raw materials are evenly mixed in a high-speed mixer, they are added to the main feeding port of the twin-screw extruder, melt-plasticized, sheared and mixed, and then extruded, water-cooled and granulated.

[0061] Comparative Example 2:

[0062] PC resin 71%

[0063] ABS resin 20%

[0064] Toughener 0%

[0065] Antioxidant 2%

[0066] Light stabilizer 0%

[0067] Color powder 1%

[0068] After the various required raw materials are evenly mixed in a high-speed mixer, they are added to the main feeding port of the twin-screw extruder, melt-plasticized, sheared and mixed, and then extruded, water-cooled and granulated.

[0069] The materials prepared in the above-mentioned examples 1-3 and comparative examples 1-2 were respectively made into test strips, and then the bending strength, bending modulus, notched impact strength (23°C), tensile strength, and Vicat softening temperature (B50) thereof were tested according to ISO standards. Meanwhile, the materials prepared in the above-mentioned examples 1-3 and comparative examples 1-2 were respectively made into test plates, and then the weather resistance thereof, i.e., the color difference change ▲E, was tested according to the PV1303 / 5 cycle standard. The specific data are shown in Table 1 below.

[0070] Table 1 Example test results

[0071]

[0072] From the results in Table 1, it can be seen that compared with ordinary PC / ABS materials (Comparative Example 2), the high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS prepared by the present invention has greatly improved comprehensive performance, and Example 2 has the best comprehensive performance. While having a special appearance, it has high toughness and good weather resistance. Compared with the high-performance PC / ABS without the addition of benzotriazole light stabilizer (Comparative Example 1), the weather resistance of Example 2 with the addition of benzotriazole light stabilizer is greatly improved, and the strength and toughness are not much reduced. This is due to the fact that the toughening agent used has a certain volume expansion effect, which minimizes the negative impact of the light stabilizer on the mechanical properties. The high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS appearance parts that can be used for automotive interiors are successfully prepared. At the same time, the appearance does not need to be sprayed to meet the visual effect, and has a good application prospect in the future automotive field or other plastic parts with such needs. (such as Figure 1 (shown)

[0073] The above description of the embodiments is to facilitate the understanding and application of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and 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 present invention should be within the protection scope of the present invention.

Claims

1. A high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material, characterized by: Prepared from the following ingredients in percentage: PC resin 65%-75%, ABS resin 15%-25%, Toughener 3%-5%, Antioxidant 1%-2%, Light stabilizer 1%-3%, Color powder 1%-2%.

2. The high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material according to claim 1, characterized in that: The PC resin is a type of phosgene-processed PC, and under the test conditions of 260° C.*5kg, the melt flow rate must be ≥15 g / 10 min.

3. The high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material according to claim 1, characterized in that: The ABS resin is a type of bulk ABS.

4. The high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material according to claim 1, characterized in that: The toughening agent is acrylonitrile-butadiene-styrene graft copolymer, and the butadiene content is greater than 65%, and the compounding ratio of the toughening agent and the ethylene methyl acrylate copolymer is: acrylonitrile-butadiene-styrene graft copolymer: ethylene methyl acrylate copolymer = 2:

1.

5. The high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material according to claim 1, characterized in that: The antioxidant is a compound of antioxidant 1010 and antioxidant 168, and the compounding ratio is 1010:168=1:

2.

6. The high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material according to claim 1, characterized in that: The light stabilizer is a benzotriazole ultraviolet absorber.

7. The high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material according to claim 1, characterized in that: The color powder can be matched according to actual needs. The color powder used in this patent is black masterbatch.

8. A method for preparing the high-toughness, high-gloss piano black spray-free weather-resistant PC / ABS material according to any one of claims 1 to 7, characterized in that: According to the ratio, various required raw materials are mixed evenly in a high-speed mixer, and then added to the main feeding port of the twin-screw extruder. After melt plasticization, shear mixing, extrusion, water cooling and granulation.

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