High-impact-strength glass fiber reinforced PPS composite material and production process thereof

Abstract

The invention discloses a high-impact-strength glass fiber reinforced PPS composite material and relates to the field of high-performance composite materials, and the composite material is widely applied to the high-requirement fields of automobiles, electronics, aerospace and the like and has the characteristics of excellent thermal stability, impact resistance, corrosion resistance and high strength. The material is prepared from the following raw materials in parts by weight: 60-80% of a polyphenylene sulfide (PPS) matrix; the mass fraction of the glass fiber is 20-40%; an interface modifier with a mass fraction of 0.5-2%; a flexibilizer with a mass fraction of 0.5-3%; the mass fraction of the antioxidant is 0.1 to 0.5 percent; and the mass fraction of the ultraviolet light absorber is 0.1-0.5%. The material has outstanding impact resistance, thermal stability, ultraviolet resistance and oxidation resistance, and meanwhile, through surface modification, a toughening formula and an efficient forming process, the high temperature resistance, ultraviolet resistance and oxidation resistance of the material are remarkably improved, so that the material has better impact resistance and toughness under high impact, the service life of a product is effectively prolonged, and the service life of the product is prolonged. And material aging and performance reduction are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of high-performance composite materials, in particular to a glass fiber reinforced PPS composite material with high impact strength and its production process. Background Art

[0002] Polyphenylene sulfide (PPS), as a high-performance engineering plastic with excellent properties, has excellent chemical stability, high temperature resistance, and electrical insulation properties, and is widely used in high-demand fields such as automotive engine components, electrical insulation materials, and aerospace components. However, PPS itself has poor impact toughness, which limits its use in applications that require high impact strength.

[0003] The mechanical properties of glass fiber reinforced PPS composites are enhanced by introducing glass fibers. However, due to the weak interfacial bonding between PPS and glass fibers, the composite material is prone to cracking under high impact loads, affecting the overall performance of the material. Therefore, how to optimize the interfacial bonding between glass fibers and the PPS matrix and improve the toughness and impact strength of the composite material has become a difficult point in current technology. Therefore, a glass fiber reinforced PPS composite material with high impact strength and its production process have important practical significance. Summary of the Invention

[0004] In order to solve the above technical deficiencies, the present invention adopts a modified technical solution. A glass fiber reinforced PPS composite material with high impact strength is composed of the following raw materials in parts by weight:

[0005] Polyphenylene sulfide (PPS) matrix: mass fraction of 60 - 80%;

[0006] Glass fiber: mass fraction of 20 - 40%;

[0007] Interface modifier: mass fraction of 0.5 - 2%;

[0008] Toughening agent: mass fraction of 0.5 - 3%;

[0009] Antioxidant: mass fraction of 0.1 - 0.5%;

[0010] Ultraviolet absorber: mass fraction of 0.1 - 0.5%.

[0011] As a further preferred embodiment of the present invention, the interface modifier is a mixture composed of epichlorohydrin or epoxy resin (DGEBA) and 3-aminopropyltriethoxysilane (APTES). The specific usage amounts are: epichlorohydrin or epoxy resin (DGEBA): mass fraction of 0.5 - 1%; 3-aminopropyltriethoxysilane (APTES): mass fraction of 0.5 - 1%.

[0012] As a further preferred embodiment of the present invention, the toughening agent is a mixture composed of styrene-acrylonitrile-butadiene (MBS) and polyester rubber (such as PEBA). The specific usage amounts are as follows: MBS: mass fraction is 1-2%; polyester rubber (such as PEBA): mass fraction is 1-2%.

[0013] As a further preferred embodiment of the present invention, the antioxidant is 2,6-di-tert-butyl-p-cresol, and the ultraviolet agent is 2-hydroxy-4-nonyloxyphenol.

[0014] As a further preferred embodiment of the present invention, it includes the following steps

[0015] S1. Perform surface treatment on the glass fiber. Use a surface modifier to treat the modified glass fiber to enhance its compatibility and adhesion with the PPS matrix;

[0016] S2. Dry mixing: Dry mix the surface-treated modified glass fiber, PPS resin, and toughening agent to ensure uniform distribution of each component;

[0017] S3. Melt extrusion molding: Feed the dry-mixed raw materials into a twin-screw extruder for melt extrusion to obtain a modified glass fiber-reinforced PPS composite material;

[0018] S4. Feed the dry-mixed raw materials into a twin-screw extruder for melt extrusion, and feed the pelletized composite material into an injection molding machine to produce finished products.

[0019] As a further preferred embodiment of the present invention, in step S1, during the glass fiber modification process, glass fibers with a length of 50-300 μm and a diameter of 5-15 μm are selected, which are single fibers or glass fiber bundles. The modifier is a mixture composed of epichlorohydrin and 3-aminopropyltriethoxysilane (APTES). Mix the selected glass fibers with the modifier, and use a temperature-controlled stirrer for uniform mixing. After mixing, react the glass fibers with the modified liquid. At a temperature of 60-80°C, the reaction time is 1 hour to ensure that the modifier fully reacts on the surface of the glass fiber to form stable chemical bonds. The reacted glass fibers need to be dried to remove excess solvents or unreacted modifiers. The drying temperature is 70-80°C, and the time is 2 hours.

[0020] As a further preferred embodiment of the present invention, in step S3, when using a twin-screw extruder for melt extrusion, the feeding section temperature is 250°C; the reaction section temperature is 280°C; the metering section temperature is 300°C; the screw speed is 300 rpm, and the feeding speed is 1 - 2 kg / h, which is adjusted according to production requirements and material fluidity. For the extrusion process, the dry-blended material is fed into the extruder for high-temperature melting. At a temperature of 270 - 280°C, it is ensured that the PPS resin is completely melted and fully mixed with the modified glass fiber, toughening agent, etc. The extruded material is cooled through the cooling zone and then sent to a pelletizer for cutting into pellets. A cold water pelletizer is used for pelletizing, and the pellet length is controlled within 3 - 5 mm.

[0021] As a further preferred embodiment of the present invention, in step S4, during the injection molding process, the injection temperature: the feeding section is 270°C; the plasticizing section is 280°C; the mold temperature is controlled at 50 - 60°C, the injection pressure is 8 - 10 MPa, the holding pressure is 6 - 8 MPa, and the cooling time is 30 - 60 seconds.

[0022] Beneficial effects

[0023] The present invention enhances the interfacial bonding force. In traditional glass fiber-reinforced PPS materials, the interfacial bonding force is weak, and delamination and peeling are likely to occur. However, through a specific surface treatment process, the present invention effectively improves the bonding force between the glass fiber and the PPS resin, improving the comprehensive mechanical properties of the composite material, especially significantly improving its performance in a high-impact environment; compared with existing glass fiber-reinforced PPS composite materials, through a unique toughening agent formula and the use of modified glass fiber, the present invention enables the material to have better impact resistance and toughness under high impact, meeting more demanding application requirements; traditional PPS composite materials usually easily experience performance degradation in high-temperature, ultraviolet, and oxidation environments. The composite material of the present invention significantly improves the high-temperature resistance, ultraviolet resistance, and oxidation resistance of the material through optimized formulation and the addition of antioxidants and ultraviolet absorbers; due to the improvement of ultraviolet resistance, oxidation resistance, and heat resistance, the composite material of the present invention performs more excellently in various harsh environments, has a wider application range, especially in the fields of automobiles, electronic products, outdoor equipment, etc., and can effectively extend the service life of products and reduce problems such as material aging and performance degradation. Specific embodiments

[0024] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] The present invention provides a technical solution: a glass fiber reinforced PPS composite with high impact strength, which is composed of the following raw materials in parts by weight:

[0026] Polyphenylene sulfide (PPS) matrix: mass fraction of 60 - 80%;

[0027] Glass fiber: mass fraction of 20 - 40%;

[0028] Interface modifier: mass fraction of 0.5 - 2%; used to improve the interfacial bonding between glass fiber and PPS matrix;

[0029] Toughening agent: mass fraction of 0.5 - 3%; used to improve the toughness and impact strength of the composite;

[0030] Antioxidant: mass fraction of 0.1 - 0.5%;

[0031] Ultraviolet absorber: mass fraction of 0.1 - 0.5%, ensuring the long-term stability and weather resistance of the material.

[0032] The interface modifier is a mixture composed of epichlorohydrin or epoxy resin (DGEBA) and 3-aminopropyltriethoxysilane (APTES). Specific usage amount: epichlorohydrin or epoxy resin (DGEBA): mass fraction of 0.5 - 1%; 3-aminopropyltriethoxysilane (APTES): mass fraction of 0.5 - 1%.

[0033] The toughening agent is a mixture composed of styrene-acrylonitrile-butadiene (MBS) and polyester rubber (such as PEBA). Specific usage amount: MBS: mass fraction of 1 - 2%; polyester rubber (such as PEBA): mass fraction of 1 - 2%.

[0034] The antioxidant is 2,6-di-tert-butyl-p-cresol, and the ultraviolet agent is 2-hydroxy-4-nonyloxyphenol.

[0035] The manufacturing process includes the following steps:

[0036] S1. Surface treatment of glass fiber: Use a surface modifier to treat the modified glass fiber to enhance its compatibility and adhesion with the PPS matrix;

[0037] S2. Dry mixing: Dry mix the surface-treated modified glass fiber, PPS resin, and toughening agent to ensure uniform distribution of each component;

[0038] S3. Melt extrusion molding: Feed the dry-mixed raw materials into a twin-screw extruder for melt extrusion to obtain a modified glass fiber reinforced PPS composite;

[0039] S4. Feed the dry-blended raw materials into a twin-screw extruder for melt extrusion. Feed the pelletized composite materials into an injection molding machine to produce finished products.

[0040] In step S1, during the glass fiber modification process, select glass fibers with a length of 50 - 300 μm and a diameter of 5 - 15 μm, which can be single fibers or glass fiber bundles. The modifier is a mixture composed of epichlorohydrin and 3-aminopropyltriethoxysilane (APTES). Mix the selected glass fibers with the modifier and use a temperature-controlled stirrer for uniform mixing. After mixing, react the glass fibers with the modified liquid at a temperature of 60 - 80 °C for 1 hour to ensure that the modifier fully reacts on the surface of the glass fibers to form stable chemical bonds. The reacted glass fibers need to be dried to remove excess solvents or unreacted modifiers. The drying temperature is 70 - 80 °C and the time is 2 hours.

[0041] In step S3, when using a twin-screw extruder for melt extrusion, the feeding section temperature: 250 °C; the reaction section temperature: 280 °C; the metering section temperature: 300 °C; the screw speed, 300 rpm, the feeding speed, 1 - 2 kg / h, adjusted according to production requirements and material fluidity. The extrusion process: Feed the dry-blended materials into the extruder for high-temperature melting. At a temperature of 270 - 280 °C, ensure that the PPS resin is completely melted and fully mixed with the modified glass fibers, toughening agent, etc. The extruded materials are cooled through the cooling zone and sent to a pelletizer for cutting into pellets. Use a cold water pelletizer for pelletizing, and control the pellet length within 3 - 5 mm.

[0042] In step S4, during the injection molding process, the injection temperature: feeding section: 270 °C; plasticizing section: 280 °C; mold temperature: controlled at 50 - 60 °C, injection pressure: 8 - 10 MPa, holding pressure: 6 - 8 MPa, and the cooling time is 30 - 60 seconds.

[0043] Example 1

[0044] The raw material ratio and treatment method are as follows.

[0045] Modified glass fiber: Glass fiber type: E glass fiber, length: 100 μm, diameter: 8 μm;

[0046] Surface treatment: Use epichlorohydrin (epoxidizing agent) to modify the surface of the glass fibers. The mass fraction of the modifier is 1%; Modification method: Mix the glass fibers and epichlorohydrin in proportion, react at room temperature for 2 hours, then wash with deionized water and dry to obtain modified glass fibers.

[0047] Polyphenylene sulfide (PPS): Type: Commercial PPS particles, molecular weight of 15,000, softening point of 290 °C; Usage: 70%. Toughening agent (MBS): Type: Styrene-acrylonitrile-butadiene (MBS) toughening agent; Usage: 1.5%. Other auxiliary materials: Antioxidant: Used to prevent PPS from oxidizing at high temperatures, such as BHT is selected as the antioxidant, and the usage is 0.2%; Ultraviolet absorber: Used to improve the ultraviolet stability of the material, such as UV-531 is selected, and the usage is 0.1%.

[0048] Process flow: Glass fiber surface modification: Mix glass fiber and epichlorohydrin, react for 2 hours, and after washing with water and drying, obtain surface-modified glass fiber. Mix the surface-modified glass fiber, PPS resin, MBS toughening agent, antioxidant, and ultraviolet absorber in the above proportions, and perform dry mixing to ensure uniform distribution of each component. Melt extrusion: Feed the mixture into a twin-screw extruder, set the temperature at 280 °C, and perform melt extrusion to obtain granular composite materials. Feed the extruded particles into an injection molding machine, the injection molding temperature is 280 - 290 °C, the injection molding pressure is 9 MPa, and the molding cycle is 30 seconds to finally obtain the required composite material parts.

[0049] Example 2

[0050] This example is similar to Example 1, but 3-aminopropyltriethoxysilane (APTES) is used as the interfacial modifier for glass fiber modification, and polyester rubber is used as the toughening agent.

[0051] Raw material ratio and treatment method:

[0052] Modified glass fiber: Glass fiber type: E glass fiber, length: 150 μm, diameter: 10 μm;

[0053] Surface treatment: Modified with 3-aminopropyltriethoxysilane (APTES), the mass fraction of the modifier is 1%; Modification method: Mix glass fiber with 3-aminopropyltriethoxysilane (APTES), react at 80 °C for 1 hour, and then wash with deionized water and dry. Polyphenylene sulfide (PPS): Type: Commercial PPS particles, molecular weight of 12,000, softening point of 280 °C; Usage: 75%. Toughening agent (PEBA): Type: Polyester rubber (PEBA); Usage: 2%. Other auxiliary materials: Antioxidant: BHT, usage is 0.1%; Ultraviolet absorber: UV-531, usage is 0.05%.

[0054] Process flow: Surface modification of glass fiber: Mix glass fiber and 3-aminopropyltriethoxysilane (APTES), react at 80 °C for 1 hour, wash with water and dry to obtain modified glass fiber. Dry mixing process: Mix the modified glass fiber, PPS resin, polyester rubber (PEBA), antioxidant and ultraviolet absorber in proportion, perform dry mixing to ensure uniform distribution of each component. Melt extrusion: Feed the mixed raw materials into a twin-screw extruder, set the temperature at 270 °C, and perform melt extrusion to obtain granular composite materials. Injection molding: Feed the extruded granules into an injection molding machine, the injection temperature is 270 - 280 °C, the injection pressure is 8 MPa, and the molding cycle is 25 seconds to finally obtain the required composite material part with high impact strength.

[0055] The performance test results of the products made in Example 1 and Example 2 are as follows in the table:

[0056] Performance indicators Example 1 Example 2 Commercial standard PPS Tensile strength (MPa 105 110 90 Flexural strength (MPa) 160 170 140 <![CDATA[Impact strength (kJ / m 2 )]]> 15 18 10 Heat distortion temperature (°C) 290 280 260 Vicat softening point (°C) 295 280 275 。

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0058] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Glass fiber reinforced PPS composite material with high impact strength, characterized in that: It consists of the following raw materials in parts by weight: Polyphenylene sulfide (PPS) matrix: mass fraction is 60 - 80%; Glass fiber: mass fraction is 20 - 40%; Interface modifier: mass fraction is 0.5 - 2%; Toughening agent: mass fraction is 0.5 - 3%; Antioxidant: mass fraction is 0.1 - 0.5%; Ultraviolet absorber: mass fraction is 0.1 - 0.5%.

2. The high impact strength glass fiber reinforced PPS composite material according to claim 1, wherein The interface modifier is a mixture composed of epichlorohydrin or epoxy resin (DGEBA) and 3 - aminopropyltriethoxysilane (APTES). The specific usage amounts are: epichlorohydrin or epoxy resin (DGEBA): mass fraction is 0.5 - 1%; 3 - aminopropyltriethoxysilane (APTES): mass fraction is 0.5 - 1%.

3. The glass fiber reinforced PPS composite material with high impact strength according to claim 1, wherein The toughening agent is a mixture composed of styrene - acrylonitrile - butadiene (MBS) and polyester rubber (such as PEBA). The specific usage amounts are: MBS: mass fraction is 1 - 2%; polyester rubber (such as PEBA): mass fraction is 1 - 2%.

4. The glass fiber-reinforced PPS composite material with high impact strength according to claim 1, characterized in that, The antioxidant is 2,6 - di - tert - butyl - p - cresol, and the ultraviolet agent is 2 - hydroxy - 4 - nonyloxyphenol.

5. The manufacturing process of the glass fiber reinforced PPS composite material with high impact strength according to claim 1, characterized in that, It includes the following steps, S1. Conduct surface treatment on the glass fiber. Use a surface modifier to treat the modified glass fiber to enhance its compatibility and adhesion with the PPS matrix; S2. Dry mixing: Dry mix the surface - treated modified glass fiber, PPS resin, and toughening agent to ensure uniform distribution of each component; S3. Melt extrusion molding: Feed the dry - mixed raw materials into a twin - screw extruder for melt extrusion to obtain a modified glass fiber - reinforced PPS composite; S4. Feed the dry - mixed raw materials into a twin - screw extruder for melt extrusion. Feed the pelletized composite into an injection molding machine to produce finished products.

6. The manufacturing process of the high impact strength glass fiber reinforced PPS composite material according to claim 5, characterized in that, In step S1, during the glass fiber modification process, select glass fibers with a length of 50 - 300 μm and a diameter of 5 - 15 μm, which are single - fiber or glass fiber bundles. The modifier is a mixture composed of epichlorohydrin and 3 - aminopropyltriethoxysilane (APTES). Mix the selected glass fibers with the modifier, and use a temperature - controlled stirrer for uniform mixing. After mixing, let the glass fibers react with the modified liquid at a temperature of 60 - 80°C for 1 hour to ensure that the modifier fully reacts on the surface of the glass fiber to form stable chemical bonds. The reacted glass fibers need to be dried to remove excess solvents or unreacted modifiers. The drying temperature is 70 - 80°C, and the time is 2 hours.

7. The manufacturing process of the high impact strength glass fiber reinforced PPS composite material according to claim 5, characterized in that, In step S3, when performing melt extrusion using a twin-screw extruder, the temperature of the feeding section is 250 °C, the temperature of the reaction section is 280 °C, the temperature of the metering section is 300 °C, the screw speed is 300 rpm, and the feeding speed is 1 - 2 kg / h, which is adjusted according to production requirements and material fluidity. For the extrusion process, the dry-blended material is fed into the extruder for high-temperature melting. At a temperature of 270 - 280 °C, it is ensured that the PPS resin is completely melted and fully mixed with modified glass fiber, toughening agent, etc. The extruded material is cooled through the cooling zone and then sent to a pelletizer for cutting into pellets. A cold water pelletizer is used for pelletizing, and the pellet length is controlled at 3 - 5 mm.

8. The manufacturing process of the high impact strength glass fiber reinforced PPS composite material according to claim 5, characterized in that, In step S4, during the injection molding process, the injection temperature of the feeding section is 270 °C. The plasticizing section is 280 °C; the mold temperature is controlled at 50 - 60 °C, the injection pressure is 8 - 10 MPa, the holding pressure is 6 - 8 MPa, and the cooling time is 30 - 60 seconds.