Cold-resistant weather-resistant shading PC / ABS composition and preparation method thereof

Abstract

The invention relates to a cold-resistant weather-resistant shading PC / ABS composition and a preparation method thereof. The cold-resistant weather-resistant shading PC / ABS composition comprises the following components: polycarbonate, ABS, a polymethylsiloxane coated titanium flexibilizer, a core-shell structure silicon flexibilizer, an antioxidant, an ultraviolet absorbent and a light stabilizer. The cold-resistant weather-resistant shading film has good cold-resistant weather-resistant shading performance, the impact strength is larger than or equal to 35 KJ / m < 2 > at the low temperature of-40 DEG C / 168 hr, meanwhile, the product has the high weather-resistant grade UVB-313 illumination 168 hr color difference kettle smaller than or equal to 6.0, the mechanical performance of the product cannot be affected by shading light-tight lamp beads, and the cold-resistant weather-resistant shading film has good comprehensive performance.

Description

Technical Field

[0001] The invention belongs to the field of polymer materials, and particularly relates to a cold-resistant, weather-resistant and light-shielding PC / ABS composition and a preparation method thereof. Background Art

[0002] PC / ABS alloy material is a thermoplastic plastic. It has excellent properties such as mechanical properties, impact strength and temperature resistance. These advantages make it widely used in electronic display screens, electrical sockets and other electronic and electrical products. However, some products are used for a long time in cold areas. Since the shell material of the product itself is not cold-resistant, the product will crack and cause leakage, which affects the safety of the product. The long-term use of electronic and electrical products made of this material in cold weather will bring potential safety hazards. Therefore, further improvements are needed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a cold-resistant, weather-resistant and light-shielding PC / ABS composition and a preparation method thereof, wherein the product has a low-temperature impact strength of -40°C / 168hr≧35KJ / m 2 At the same time, the product has a high weather resistance level of UVB-313 light 168hr color difference ▲E≦6.0 and the light-shielding and opaque lamp beads will not affect the mechanical properties of the product, and has good comprehensive performance.

[0004] The present invention provides a cold-resistant, weather-resistant and light-shielding PC / ABS composition, which comprises the following components in parts by weight:

[0005]

[0006] Preferably, the polycarbonate is an aromatic polycarbonate.

[0007] Preferably, the weather-resistant transparent grade ABS

[0008] Preferably, the titanium-based toughening agent includes one or more of rutile titanium dioxide, titanium (IV) oxide, titanium dioxide, and polymethylsiloxane-coated titanium dioxide; and the average particle size thereof is 0.2-5 μm (D50).

[0009] Preferably, the core-shell structured silicon-based toughening agent.

[0010] Preferably, the antioxidant is a hindered amine antioxidant.

[0011] Preferably, the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0012] Preferably, the light stabilizer is a hindered amine light stabilizer.

[0013] The present invention also provides a method for preparing a cold-resistant, weather-resistant and light-shielding PC / ABS composition, comprising the following steps:

[0014] After fully mixing the components according to the proportion, the components are extruded and made into materials to obtain a cold-resistant, weather-resistant and light-shielding PC / ABS composite; wherein the processing temperature during extrusion is 250-260°C.

[0015] The invention provides a cold-resistant, weather-resistant and light-shielding PC / ABS composition for use in high-end electronic products, plugs and sockets.

[0016] Beneficial Effects

[0017] (1) The present invention compounded a titanium toughening agent coated with polymethylsiloxane, a core-shell structure silicon toughening agent, an ultraviolet absorber, and a light stabilizer to enable the product to achieve a cold-resistant and high-weather-resistant grade of light-shielding effect.

[0018] (2) The present invention adds a special polymethylsiloxane-coated titanium toughening agent, which can improve the uniform dispersion effect inside the polymer and has good compatibility with PC / ABS, so that very thin products can achieve the effect of light-shielding and light-proof lamp beads without affecting the mechanical properties of the products.

[0019] (3) The present invention unexpectedly enhances the cold resistance of the product by compounding the titanium toughening agent coated with polymethylsiloxane and the core-shell structure silicon toughening agent.

[0020] (4) The present invention has good cold resistance, low temperature -40℃ / 168hr impact strength ≥35KJ / m 2 At the same time, the product has a high weather resistance level of UVB-313 light 168hr color difference ▲E≦6.0 and the light-shielding and opaque lamp beads will not affect the mechanical properties of the product, and has good comprehensive performance. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0022] The specific raw materials used in the embodiments and comparative examples and their brands and manufacturers are as follows:

[0023] Polycarbonate: Covestro ET3117, its melt index is 7g / 10min (300℃×1.2kg);

[0024] Transparent ABS: Acrylonitrile-butadiene-styrene, Chimei PA-758;

[0025] Titanium toughening agent 1#: Polymethylsiloxane coated titanium dioxide, average particle size 0.2μm, Shanghai Jiuying New Materials Co., Ltd. R2238

[0026] Titanium toughening agent 2#: titanium dioxide, average particle size 0.2 μm, R248 from Shanghai Jiuying New Materials Co., Ltd.;

[0027] Titanium toughening agent 3#: rutile titanium dioxide, average particle size 0.2 μm, R666 from Shanghai Jiuying New Materials Co., Ltd.;

[0028] Titanium toughening agent 4#: titanium dioxide, average particle size 10 μm, R2366 from Shanghai Jiuying New Materials Co., Ltd.;

[0029] Silicone toughening agent 1#: core-shell structure silicon-based toughening agent, Zhongyuan Chemical MR01;

[0030] Silicone toughening agent 2#: ordinary MBS toughening agent, EM500 from LG Chemical of South Korea;

[0031] Antioxidant: Hindered phenol antioxidant, Rianlon B900;

[0032] Weathering agent: Benzotriazole UV absorber, Lianlong UV1577;

[0033] Weathering agent: Hindered amine light stabilizer, Rianlon 770.

[0034] The preparation method comprises:

[0035] According to the ratio, each raw material was added into a high-speed mixer in turn and mixed at high speed for 2 minutes. Then, the fully mixed mixture was placed in a twin-screw extruder with a length-to-diameter ratio of 40:1. The processing temperature was controlled at 260°C and the speed of the twin-screw extruder was controlled at 390 rpm. Extrusion and granulation were performed to obtain the product.

[0036] Test methods include:

[0037] Before testing, the samples were placed at a temperature of 23±2°C and a humidity of 50±5% for 48 hours.

[0038] ① Cold impact test: The material is injection molded into a test strip with a width of 10mm, a length of 80mm, and a thickness of 4mm. After being placed in a -40℃ refrigerator for 168 hours, it is tested according to ISO179. If the notched impact is greater than 35, it is qualified.

[0039] ② Weathering test: The material was injection molded into a 60mm wide, 80mm long, and 3mm thick color plate, and placed in a UV light box with UVB-313 light for 8 hours, the blackboard temperature was 60℃, and the temperature was 0.55W / (m 2nm)@310nm; condensation for 4 hours, blackboard temperature at 60℃, 14 cycles of 168 hours of illumination, and color difference test. The customer requires ▲E≦6 to be qualified.

[0040] Table 1 Comparison of formulation composition and test performance of embodiments and comparative examples

[0041]

[0042] It can be seen from the above table that the products of Examples 1-6 have excellent cold resistance and weather resistance. Compared with Example 1, Comparative Example 1 and Comparative Example 2 show that the cold resistance of the material is significantly enhanced by compounding the polymethylsiloxane-coated titanium toughening agent and the core-shell structure silicon toughening agent. Compared with Example 1, the core-shell structure silicon toughening agent and the weathering agent are compounded in Comparative Example 3, which has a significantly improved weathering effect. Compared with Example 1, the use of ordinary MBS toughening agent and the core-shell structure silicon toughening agent in Comparative Example 4 is unqualified in terms of weather resistance and low-temperature impact.

[0043] Examples 1-4 verify that by adding titanium-based toughening agents of different particle sizes and types, the product performance reaches the optimal effect only when the average particle size is 0.2-5 μm (D50) and the titanium dioxide is coated with polymethylsiloxane.

[0044] Example 5 verifies that by adding core-shell silicon toughening agent, polymethylsiloxane-coated titanium dioxide, ultraviolet absorber and light stabilizer to the PC / ABS material system in the optimal ratio, the cold resistance and high weather resistance are unexpectedly enhanced, and the ultra-low temperature -40℃ / 168hr impact strength is ≧35KJ / m 2 At the same time, the product has a high weather resistance level of UVB-313 light 168hr color difference ▲E≦6.0, and the light-shielding and opaque lamp beads. The cold resistance, high weather resistance and light-shielding comprehensive performance meet the customer's usage requirements.

Claims

1. A cold-resistant, weather-resistant and light-shielding PC / ABS composition, characterized in that: In parts by weight, it comprises the following components:

2. The PC / ABS composition according to claim 1, characterized in that: The polycarbonate is an aromatic polycarbonate.

3. The PC / ABS composition according to claim 1, characterized in that: The ABS is transparent weather-resistant ABS.

4. The PC / ABS composition according to claim 1, characterized in that: The titanium toughening agent includes one or more of rutile titanium dioxide, titanium oxide, titanium dioxide, and polymethylsiloxane-coated titanium dioxide; and the average particle size thereof is 0.2-5 μm.

5. The PC / ABS composition according to claim 1, characterized in that: The antioxidant is a hindered amine antioxidant.

6. The PC / ABS composition according to claim 1, characterized in that: The ultraviolet absorber is a benzotriazole ultraviolet absorber.

7. The PC / ABS composition according to claim 1, characterized in that: The light stabilizer is a hindered amine light stabilizer.

8. A method for preparing the cold-resistant, weather-resistant and light-shielding PC / ABS composition according to any one of claims 1 to 6, comprising the following steps: After fully mixing the components according to the proportion, the components are extruded and made into materials to obtain a cold-resistant, weather-resistant and light-shielding PC / ABS composite; wherein the processing temperature during extrusion is 250-260°C.

9. Use of the cold-resistant, weather-resistant and light-shielding PC / ABS composition according to any one of claims 1 to 6 in electronic products, plugs and sockets.

Images