Polycarbonate composition as well as preparation method and application thereof

Abstract

The invention discloses a polycarbonate composition as well as a preparation method and application thereof, and the polycarbonate composition comprises the following components in parts by weight: 80-90 parts of polycarbonate resin; 3-5 parts of a toughening agent; 4-14 parts of a wear-resistant auxiliary agent; 2-5 parts of a carbon nanotube; the wear-resistant additive is fluoride and ultra-high molecular weight polyethylene. The polycarbonate composition provided by the invention can achieve both high wear resistance and high toughness, and is suitable for the field with high requirements on wear resistance and toughness at the same time.

Description

Technical Field

[0001] This invention relates to the field of engineering plastics technology, specifically to a polycarbonate composition, its preparation method, and its application. Background Technology

[0002] In the semiconductor industry, wafers are easily contaminated by abrasive debris during the unloading and loading process, requiring wafer casings to have good wear resistance and low wear. Polycarbonate (PC) itself does not have excellent wear resistance, and the addition of carbon nanotubes (CNTs) reduces the material's modulus and worsens its wear resistance. To avoid abrasive debris generation due to wear, the wear resistance of PC+CNT materials needs to be improved. At the same time, since the material is used to load wafers, it also requires high toughness to prevent cracking due to drops during production.

[0003] However, wear resistance and toughness are inversely related, and current polycarbonate compositions still struggle to achieve a balance between both. Therefore, how to achieve a balance between wear resistance and high toughness in polycarbonate materials is an urgent problem to be solved. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention proposes a polycarbonate composition, its preparation method, and its application. The specific technical solution is as follows:

[0005] A polycarbonate composition, by weight, comprises the following components: 80-90 parts of polycarbonate resin, such as 80, 82, 84, 86, 88, or 90 parts; 3-5 parts of toughening agent, such as 3, 4, or 5 parts; 4-14 parts of wear-resistant additive, such as 4, 6, 8, 10, 12, or 14 parts; and 2-5 parts of carbon nanotubes, such as 2, 2.5, 3, 3.2, 3.5, 4, 4.5, or 5 parts; wherein the wear-resistant additive is a fluoride and ultra-high molecular weight polyethylene, wherein the fluoride is 1- 10 parts, of which 1-10 parts are ultra-high molecular weight polyethylene; the weight ratio of the fluoride to ultra-high molecular weight polyethylene is (0.16-1.8):1, such as 0.16:1, 0.2:1, 0.4:1, 0.6:1, 0.8:1, 1:1, 1.17:1, 1.25:1, 1.5:1, 1.77:1, 1.8:1, and the toughening agent is one or more of methyl methacrylate-butadiene-styrene toughening agents or organosilicon toughening agents.

[0006] Wear-resistant additives can improve the wear resistance of materials due to their self-lubricating properties. However, the addition of wear-resistant additives often leads to a significant decrease in the mechanical properties of the final material, with the most noticeable decrease in impact performance. The inventors discovered that adding a specific mass ratio of polytetrafluoroethylene and / or tetrafluoroethylene-hexafluoropropylene copolymer and ultra-high molecular weight polyethylene to PC resin, along with a specific toughening agent, can improve wear resistance while reducing the decrease in impact performance, resulting in a polycarbonate resin with good toughness and wear resistance.

[0007] Furthermore, the wear-resistant additive is a fluoride and ultra-high molecular weight polyethylene, wherein the number-average molecular weight of the ultra-high molecular weight polyethylene is 1.5 million to 6 million, such as 1.5 million, 1.7 million, 2 million, 2.5 million, 3 million, 3.7 million, 4 million, 4.5 million, 5 million, 5.5 million, or 6 million, preferably 3.5 million to 6 million, and the number-average molecular weight is obtained according to the Margolies' equation.

[0008] Furthermore, the fluoride is polytetrafluoroethylene and / or tetrafluoroethylene-hexafluoropropylene copolymer.

[0009] Furthermore, the weight ratio of the fluoride to ultra-high molecular weight polyethylene is (0.8-1.2):1, such as 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1.

[0010] Furthermore, the toughening agent has a core-shell structure.

[0011] Furthermore, the polycarbonate resin has a melt index of 15-25 g / 10 min under the test conditions of 300℃ / 1.2 kg, and the test standard for melt index is ISO 1133-2022.

[0012] Furthermore, the carbon nanotubes are single-walled carbon nanotubes and / or multi-walled carbon nanotubes.

[0013] Furthermore, it also includes 0-2 parts of antioxidants or dispersants.

[0014] Furthermore, the antioxidant is one or more of the following: phenolic antioxidants, hindered amine antioxidants, phosphite antioxidants, and sulfuric acid-containing antioxidants.

[0015] Furthermore, the dispersant is a modified synthetic wax.

[0016] The present invention also provides a method for preparing the above-mentioned polycarbonate composition, comprising the following steps:

[0017] According to the formula, weigh each component and mix them to obtain a premix; put the premix into an extruder, melt blend and extrude granulation to obtain the polycarbonate composition.

[0018] Furthermore, the extruder is a twin-screw extruder, and the temperature of each zone of the barrel of the twin-screw extruder is 230-250℃.

[0019] The present invention also provides the application of the above-described polycarbonate composition in the semiconductor industry, such as the preparation of wafer cassettes for preparing wafers.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The polycarbonate composition provided by this invention can achieve a balance between wear resistance and toughness. The wafer cassette made with this composition has good wear resistance, greatly reducing material wear. Furthermore, due to its high toughness, it is not prone to cracking during production and use. It also has high cleanliness during use and a long service life. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] <Preparation of Examples and Comparative Examples>

[0024] The raw materials used in the embodiments and comparative examples of this invention are all commercially available, but are not limited to these materials:

[0025] Polycarbonate: melt index 19 g / 10 min, grade PC 2220, purchased from Wanhua Chemical;

[0026] Toughening agent A: Methyl methacrylate-butadiene-styrene toughening agent, brand name M 521, purchased from Foshan Ruishan Group;

[0027] Toughening agent B: Organosilicon toughening agent, MR-01, purchased from Foshan Ruishan Group;

[0028] Toughening agent C: Polyolefin elastomer, Engage 8137, purchased from Dow Chemical Company, USA;

[0029] Carbon nanotubes: Multi-walled carbon nanotubes, LUCAN BT1001M, purchased from LG, South Korea;

[0030] Fluoride A: Polytetrafluoroethylene, F-5AEX, purchased from Solvay;

[0031] Fluoride B: Tetrafluoroethylene-hexafluoropropylene copolymer, FX-5911, purchased from 3M.

[0032] Ultra-high molecular weight polyethylene A: GUR 4012, with a number average molecular weight of 170W, purchased from Celanese;

[0033] Ultra-high molecular weight polyethylene B: GUR 4113, with a number average molecular weight of 370W, purchased from Celanese;

[0034] Ultra-high molecular weight polyethylene C: GUR 4022, with a number average molecular weight of 500W, was purchased from Celanese.

[0035] Antioxidants: Antioxidant 1076 and Antioxidant 168 were compounded in a 1:1 ratio and were commercially available. The same commercially available products were used in parallel experiments.

[0036] The preparation methods of the embodiments and comparative examples of the present invention are as follows:

[0037] According to the formula, weigh each component and mix them to obtain a premix; put the premix into a twin-screw extruder for melt blending and extrusion granulation to obtain a polycarbonate composition. The temperature of each zone of the barrel of the twin-screw extruder is 230-250℃.

[0038] Unless otherwise specified, the word "parts" in this instruction manual means "parts by weight".

[0039] <Test Standards>

[0040] The performance testing standards for the various embodiments and comparative examples of this invention are as follows:

[0041] Wear: Tested according to standard JIS-K7218-1986;

[0042] Notched impact strength: ISO 180-2023, Type A notch, 23°C, 50% humidity conditions.

[0043] Table 1. Formulations (parts by weight) and performance test results of Examples 1-12

[0044]

[0045]

[0046] Table 2. Comparative Examples 1-5: Formulations (parts by weight) and Performance Test Results

[0047] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 polycarbonate 80 80 80 80 80 Toughening agent B 3 3 3 3 Toughening agent C 3 carbon nanotubes 3 3 3 3 3 Fluoride A 10 5 0.5 7.2 Ultra-high molecular weight polyethylene C 10 5 9.5 2.8 antioxidants 1 1 1 1 1 Wear (mg) 42 102 75 80 17 <![CDATA[Izod impact strength (kJ / m 2 )]]> 11 25 14 22 13

[0048] Based on the test data for abrasion and notched impact strength in Tables 1 and 2, the polycarbonate compositions prepared in Examples 1-12 show significant advantages compared to the comparative examples, effectively meeting the high standards required by customers and the market. Examples 1-12 of this application simultaneously incorporate polycarbonate, abrasion-resistant additives, specific toughening agents, and carbon nanotubes. Furthermore, the mass ratio of fluoride to ultra-high molecular weight polyethylene in the abrasion-resistant additives is within a specific range. The resulting polycarbonate compositions possess high toughness while maintaining high abrasion resistance, with abrasion loss below 30 mg and notched impact strength above 16.3 kJ / m. 2 This achieves a balance between wear resistance and high toughness.

[0049] Comparative Examples 1-5 were all compared with Example 1. Comparative Example 1 did not add ultra-high molecular weight polyethylene, resulting in low notched impact strength. The addition of fluoride alone could not achieve both wear resistance and high toughness. Comparative Example 2 did not add fluoride, resulting in poor wear resistance. The addition of ultra-high molecular weight polyethylene alone could not achieve both high wear resistance and high toughness. The toughening agent added to Comparative Example 3 was a polyolefin elastomer, which prevented the toughness of the composition from being improved. In Comparative Examples 4-5, the mass ratio of fluoride to ultra-high molecular weight polyethylene was either too low or too high, which prevented the composition from achieving both wear resistance and toughness.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polycarbonate composition, characterized in that, By weight, it includes the following components: The wear-resistant additive is a fluoride and ultra-high molecular weight polyethylene, wherein the weight ratio of the fluoride to ultra-high molecular weight polyethylene is (0.16-1.8):1, and the toughening agent is one or more of methyl methacrylate-butadiene-styrene toughening agents or organosilicon toughening agents.

2. The polycarbonate composition according to claim 1, characterized in that, The number average molecular weight of the ultra-high molecular weight polyethylene is 1.5 million to 6 million.

3. The polycarbonate composition according to claim 1, characterized in that, The fluoride is polytetrafluoroethylene and / or tetrafluoroethylene-hexafluoropropylene copolymer.

4. The polycarbonate composition according to claim 1, characterized in that, The weight ratio of the fluoride to ultra-high molecular weight polyethylene is (0.8-1.2):

1.

5. The polycarbonate composition according to claim 1, characterized in that, The toughening agent has a core-shell structure.

6. The polycarbonate composition according to claim 1, characterized in that, The carbon nanotubes are single-walled carbon nanotubes and / or multi-walled carbon nanotubes.

7. The polycarbonate composition according to claim 1, characterized in that, It also includes 0-2 parts of antioxidants or dispersants.

8. The polycarbonate composition according to claim 7, characterized in that, The antioxidant is one or more of the following: phenolic antioxidants, hindered amine antioxidants, phosphite antioxidants, or sulfuric acid-containing antioxidants.

9. A method for preparing a polycarbonate composition according to any one of claims 1-8, characterized in that, Includes the following steps: According to the formula, weigh each component and mix them to obtain a premix; put the premix into an extruder, melt blend and extrude granulation to obtain the polycarbonate composition.

10. The use of the polycarbonate composition according to any one of claims 1-8 in the semiconductor industry, preferably in the preparation of wafer cassettes.

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