A polyphenylene ether nanocomposite and a method for preparing the same

Abstract

The application belongs to the technical field of high polymer materials, and specifically provides a polyphenyl ether nanocomposite and a preparation method thereof.The polyphenyl ether nanocomposite comprises the following components in parts by weight: 50-85 parts of polyphenyl ether, 5-30 parts of a flow modifier, 3-10 parts of a toughening agent, 0.5-15 parts of organic montmorillonite, 0.5-3 parts of an antioxidant, and 0.5-2 parts of a release agent; the toughening agent is a hydrogenated styrene-butadiene-styrene block copolymer.The application utilizes the synergistic effect of the organic montmorillonite and the toughening agent SEBS to modify the polyphenyl ether resin, thereby improving the processing performance and rigidity of the polyphenyl ether material and greatly improving the toughness of the polyphenyl ether material.The obtained polyphenyl ether nanocomposite has excellent mechanical performance and processing performance, and expands the application of the polyphenyl ether material in the fields of electronic appliances and the like.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a polyphenylene ether nanocomposite material and its preparation method. Background Technology

[0002] Polyphenylene oxide (PPO), as a high-performance thermoplastic engineering plastic, occupies an important position in the industrial field due to its excellent mechanical properties, heat resistance, flame retardancy, and water resistance. However, PPO resin itself has many unavoidable defects, such as high melt viscosity, difficult molding and processing, susceptibility to stress cracking, and poor toughness, which seriously limit its independent application and industrial promotion.

[0003] To improve the processing performance of PPO resin, the industry commonly modifies it by blending it with other resins. The most frequently used modified resin is polystyrene (PS). PS and PPO have excellent compatibility; blending them can significantly reduce the melt viscosity of PPO and greatly improve the processing performance of PPO materials. However, PS has poor heat resistance, and its addition will lower the service temperature of polyphenylene oxide materials, making it difficult to balance processing performance and heat resistance, thus failing to meet the requirements of applications with high heat resistance.

[0004] To address the poor toughness of PPO, existing technologies typically employ the addition of toughening agents to the blend system. However, the addition of toughening agents reduces the material's rigidity, while in practical applications, most PPO products require not only sufficient toughness but also good rigidity (usually measured by flexural modulus). Inorganic fillers can effectively improve the modulus of polymer materials; however, the addition of inorganic fillers often has a significant negative impact on the material's toughness, especially for inorganic fillers with large aspect ratios and large dimensions, which cause more severe damage to toughness. Furthermore, the addition of inorganic fillers can easily lead to a decrease in the material's melt flow index, adversely affecting processing. Therefore, developing a polyphenylene oxide (PPO) composite material that combines excellent processing performance, high rigidity, and high toughness is of great practical significance and industrial value for solving the current bottlenecks in PPO applications and expanding its application areas. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, the purpose of this invention is to provide a polyphenylene ether nanocomposite material and its preparation method, so as to achieve a balanced improvement in the processing performance, rigidity and toughness of polyphenylene ether materials.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a polyphenylene ether nanocomposite material, which comprises the following components in parts by weight: 50-85 parts polyphenylene ether, 5-30 parts flow modifier, 3-10 parts toughening agent, 0.5-15 parts organomontmorillonite, 0.5-3 parts antioxidant, and 0.5-2 parts release agent; wherein the toughening agent is hydrogenated styrene-butadiene-styrene block copolymer (SEBS).

[0007] Furthermore, the ratio of the toughening agent to organomontmorillonite is 1:3 to 5:1; preferably 1:3 to 2.5:1; more preferably 1:2 to 2.5:1.

[0008] Furthermore, the polyphenylene ether nanocomposite material comprises the following components in parts by weight: 65-80 parts polyphenylene ether, 10-20 parts flow modifier, 5-10 parts toughening agent, 2-15 parts organomontmorillonite, 0.5-2 parts antioxidant, and 0.5-1 part release agent; preferably: 70-75 parts polyphenylene ether, 14-15 parts flow modifier, 5-10 parts toughening agent, 5-10 parts organomontmorillonite, 0.5-2 parts antioxidant, and 0.5-1 part release agent.

[0009] Furthermore, the flow modifier is polystyrene.

[0010] Furthermore, the antioxidant includes one or more of antioxidant 1076, antioxidant 1010, or antioxidant 168.

[0011] Furthermore, the release agent is linear low-density polyethylene or pentaerythritol stearate.

[0012] The preparation method of the above-mentioned polyphenylene ether nanocomposite material includes the following steps: (1) Add polyphenylene ether, flow modifier, toughening agent, organomontmorillonite, antioxidant and release agent to the mixer for premixing; (2) The premixed material is melt-extruded and granulated; (3) The particles are made into samples through a molding process.

[0013] Furthermore, the melt extrusion is performed using a twin-screw extruder, and the process parameters for the twin-screw extruder are as follows: zone 1 temperature 100-170℃, zone 2 temperature 220-260℃, zone 3 temperature 230-270℃, zone 4 temperature 260-290℃, zone 5 temperature 260-290℃, and die head temperature 270-300℃.

[0014] Furthermore, the molding process in step (3) is injection molding.

[0015] The beneficial effects of this invention are as follows: This invention modifies polyphenylene ether (PPE) resin by compounding organomontmorillonite with a specific type of toughening agent (SEBS) in a specific ratio. This effectively overcomes the bottleneck in existing PPE composite material modification technologies where processing performance, rigidity, and toughness cannot be balanced. Under screw shearing and high melt viscosity, organomontmorillonite and SEBS are uniformly dispersed in the PPE material, imparting a unique network structure. The synergistic effect of these two components significantly improves the toughness of the PPE material while simultaneously enhancing its processing performance and rigidity, ultimately achieving simultaneous optimization of processing performance, toughness, and rigidity.

[0016] The polyphenylene ether nanocomposite material obtained by this invention has excellent processing performance, high rigidity and high toughness, which will greatly expand the application of polyphenylene ether materials in the fields of electronics and electrical appliances. Attached Figure Description

[0017] Figure 1 This is a scanning electron microscope image of the polyphenylene ether nanocomposite material of the present invention. Detailed Implementation

[0018] To better illustrate the purpose, technical solution, and advantages of this invention, the invention will be further described below with reference to specific embodiments. The following embodiments are merely typical examples of this invention, and the scope of protection of this invention is not limited thereto.

[0019] The polyphenylene ether used in the embodiments and comparative examples of this invention is LXR040 (intrinsic viscosity 40±2 cm). 3 / g), polystyrene was PG-33, organomontmorillonite was DK10, and other experimental materials were commercially available unless otherwise specified.

[0020] Examples 1-8, Comparative Examples 1-11 The preparation method of the polyphenylene ether nanocomposite materials described in Examples 1-8 and Comparative Examples 1-11 of this invention comprises the following steps: First, each component is added to a mixer for premixing according to the formula ratio shown in Table 1. Then, the premixed material is added to a twin-screw extruder for melt extrusion and granulation. Finally, the particles are made into samples through injection molding. The extrusion process parameters are: zone 1 temperature 150℃, zone 2 temperature 250℃, zone 3 temperature 270℃, zone 4 temperature 280℃, zone 5 temperature 290℃, and die head temperature 300℃.

[0021] Table 1 like Figure 1 The image shown is a scanning electron microscope image of the polyphenylene ether nanocomposite material prepared in Example 1 of the present invention. Organomontmorillonite is uniformly dispersed in the polyphenylene ether material, giving the polyphenylene ether material a special network structure.

[0022] The performance of the polyphenylene ether nanocomposites prepared in Examples 1-8 and Comparative Examples 1-11 was tested, and the specific measurement methods are as follows: Melt flow index: The melt flow index of the particles was tested using a melt flow rate tester according to ASTM D1238-04 standard. The test temperature was 300℃ and the nominal load was 5kg. Notched impact strength: Tested according to ASTM D256 standard, with a pendulum energy of 5.5 J; Flexural modulus: Tested according to ASTM D790 standard, with a span of 50 mm, a loading rate of 1.27 mm / min, and a spline thickness of 3.2 mm.

[0023] The performance of the polyphenylene ether nanocomposites prepared in Examples 1-10 and Comparative Examples 1-11 was tested, and the test results are shown in Table 2.

[0024] Table 2 As can be seen from the data in Table 2, only when organomontmorillonite and toughening agent SEBS are present simultaneously and within the optimal ratio range can the obtained polyphenylene ether nanocomposite material possess excellent flowability, rigidity, and superior toughness. As described in Examples 2 and 7, the polyphenylene ether composite material, while maintaining a high melt index and flexural modulus, exhibits a notched impact strength more than 10 times higher than that of Comparative Example 5. Arbitrarily changing the type of organomontmorillonite or toughening agent, or the ratio of organomontmorillonite to toughening agent, will weaken the synergistic effect.

Claims

1. A polyphenylene ether nanocomposite material, characterized in that, The product comprises the following components in parts by weight: 50-85 parts polyphenylene ether, 5-30 parts flow modifier, 3-10 parts toughening agent, 0.5-15 parts organomontmorillonite, 0.5-3 parts antioxidant, and 0.5-2 parts release agent. The toughening agent is a hydrogenated styrene-butadiene-styrene block copolymer, and the organomontmorillonite is DK10. The ratio of the toughening agent to the organomontmorillonite is 1:3 to 5:

1.

2. The polyphenylene ether nanocomposite material according to claim 1, characterized in that, The toughening agent and organomontmorillonite are added in a ratio of 1:3 to 2.5:

1.

3. The polyphenylene ether nanocomposite material according to claim 1, characterized in that, It includes the following components by weight: 65-80 parts polyphenylene ether, 10-20 parts flow modifier, 5-10 parts toughening agent, 2-15 parts organomontmorillonite, 0.5-2 parts antioxidant, and 0.5-1 part release agent.

4. The polyphenylene ether nanocomposite material according to claim 1, characterized in that, The flow modifier is polystyrene.

5. The polyphenylene ether nanocomposite material according to claim 1, characterized in that, The antioxidant includes one or more of antioxidant 1076, antioxidant 1010, or antioxidant 168.

6. The polyphenylene ether nanocomposite material according to claim 1, characterized in that, The release agent is linear low-density polyethylene or pentaerythritol stearate.

7. The method for preparing the polyphenylene ether nanocomposite material according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Add polyphenylene ether, flow modifier, toughening agent, organomontmorillonite, antioxidant and release agent to the mixer for premixing; (2) The premixed material is melt-extruded and granulated to obtain the polyphenylene ether nanocomposite material.

8. The preparation method according to claim 7, characterized in that, The melt extrusion is performed using a twin-screw extruder. The process parameters for the twin-screw extruder are as follows: Zone 1 temperature 100-170℃, Zone 2 temperature 220-260℃, Zone 3 temperature 230-270℃, Zone 4 temperature 260-290℃, Zone 5 temperature 260-290℃, and die head temperature 270-300℃.

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