High-strength carbon fiber modified plastic and method for preparing the same
By modifying the carbon fiber surface through multiple steps and combining it with maleic anhydride-grafted polypropylene, a covalently bonded interface system is formed, which solves the interfacial incompatibility problem between carbon fiber and polypropylene matrix and significantly improves the mechanical properties and stability of composite materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUBEI FEIGE TECH
- Filing Date
- 2026-04-29
- Publication Date
- 2026-06-09
AI Technical Summary
The interfacial incompatibility between carbon fiber and polypropylene matrix limits the improvement of the mechanical properties of composite materials, and existing improvement methods are limited in effectiveness and unstable.
A multi-step modification process was adopted to treat the surface of carbon fiber, introducing an aminosilane coupling layer, a gallic acid amide bond linking layer, and an itaconic acid active double bond functional layer to form a covalent bonded interface system. Maleic anhydride-grafted polypropylene was used as an interface compatibilizer, and a two-step extrusion granulation process was used to ensure the chemical bonding between the carbon fiber and the polypropylene matrix.
It significantly improves the interfacial shear strength between carbon fiber and polypropylene matrix and the mechanical properties of composite materials, ensuring the uniformity and stability of materials and realizing high-strength carbon fiber modified plastics.
Abstract
Claims
1. A high-strength carbon fiber modified plastic, characterized in that, By weight, it includes the following ingredients: 90-100 parts polypropylene, 8-12 parts modified carbon fiber, 3-5 parts maleic anhydride grafted polypropylene, 2-4 parts toughening agent, 0.7-1.1 parts antioxidant, and 0.5-0.8 parts lubricant.
2. The high-strength carbon fiber modified plastic according to claim 1, characterized in that, By weight, it includes the following raw materials: 95-100 parts polypropylene, 10-12 parts modified carbon fiber, 4-5 parts maleic anhydride grafted polypropylene, 3-4 parts toughening agent, 0.8-1 part antioxidant, and 0.6-0.8 parts lubricant.
3. The high-strength carbon fiber modified plastic according to claim 1, characterized in that, The modified carbon fiber is prepared as follows: S1. Add carbon fiber to nitric acid solution for soaking treatment. After treatment, filter, wash and dry to obtain pretreated carbon fiber. S2. Add γ-aminopropyltriethoxysilane to an aqueous ethanol solution and stir for 30-50 min. Then add pretreated carbon fiber and heat to react. After the reaction is complete, filter, wash and dry to obtain aminated carbon fiber. S3. Add gallic acid, DCC, and NHS to DMF and stir in the dark at 0-4℃ for 1-2 hours. Then add aminated carbon fiber and stir to react. After the reaction is complete, filter, wash, and dry to obtain organic carbon fiber. S4. Add itaconic acid, DCC, and DMAP to DMF and stir in the dark at 0-4℃ for 1-2 hours. Then add organic carbon fiber and carry out a constant temperature reaction. After the reaction is completed, filter and dry to obtain modified carbon fiber.
4. The high-strength carbon fiber modified plastic according to claim 3, characterized in that, In step S1, the mass concentration of nitric acid is 65-75%, the soaking temperature is 60-70℃, and the soaking time is 1.5-2.5h.
5. The high-strength carbon fiber modified plastic according to claim 3, characterized in that, In step S2, the volume ratio of ethanol to water in the aqueous ethanol solution is 95:5, the mass ratio of the pretreated carbon fiber to γ-aminopropyltriethoxysilane is 100:10-15, and the heating reaction temperature is 60-70℃ for 3-4 hours.
6. The high-strength carbon fiber modified plastic according to claim 3, characterized in that, In step S3, the mass ratio of aminated carbon fiber, gallic acid, DCC, and NHS is 100:8-12:9-15:5-9, and the stirring reaction is carried out at a temperature of 25-35°C for 8-12 hours.
7. The high-strength carbon fiber modified plastic according to claim 3, characterized in that, In step S4, the mass ratio of organic carbon fiber, itaconic acid, DCC, and DMAP is 100:7-11:9-15:0.8-1.5, and the isothermal reaction temperature is 25-30℃ for 14-18 hours.
8. The high-strength carbon fiber modified plastic according to claim 1, characterized in that, The antioxidant is a compound of antioxidant 1010 and antioxidant 168 in a mass ratio of 1-2:1; the toughening agent is an ethylene-octene copolymer; and the lubricant is one or both of calcium stearate and ethylene bis-stearamide.
9. A method for preparing high-strength carbon fiber modified plastic as described in any one of claims 1-8, characterized in that, The process includes the following steps: weighing the raw materials according to the formula, mixing polypropylene, maleic anhydride-grafted polypropylene, toughening agent, antioxidant, and lubricant evenly, adding them to a twin-screw extruder for melt blending, performing a first extrusion granulation, mixing the resulting granules with modified carbon fiber, and then performing a second granulation through a twin-screw extruder to obtain high-strength carbon fiber modified plastic.
10. The preparation method according to claim 9, characterized in that, The temperature of the primary extrusion granulation is 170-190℃, and the screw speed is 200-400 rpm; the temperature of the secondary granulation is 185-200℃, and the screw speed is 200-300 rpm.