Carbon nano dual-cured resin matrix for pultrusion process and composite of carbon nano dual-cured resin matrix

Abstract

The invention relates to a carbon nano dual-cured resin matrix for a pultrusion process and a composite of the carbon nano dual-cured resin matrix. The resin matrix is made from the following raw materials in parts by weight: 50-90 parts of epoxy resin and a curing agent thereof, 10-50 parts of vinyl ester resin and an initiator thereof, 1-2 parts of carbon nanotubes, and an appropriate amount of optional additives; the resin matrix is a dual-cured homogeneous system formed by the epoxy resin and the curing agent thereof, the vinyl ester resin and the initiator thereof, and the carbon nanotubes uniformly dispersed in the resin matrix. The resin system has the characteristics of low viscosity, high invasion with fibers, high curing speed and uniform heat and mass transfer; the resin matrix is high in stability and continuity in the pultrusion process. The composite prepared through pultrusion is high in flexibility, higher in interlaminar shear strength, high in heat resistance, and excellent in surface smoothness and rigidity.

Description

(1) Technical field [0001] The invention relates to the field of fiber-reinforced resin-based composite materials and processing, in particular to a carbon nanometer double-cured resin matrix used in a pultrusion molding process and a composite material thereof. (2) Background technology [0002] Resin-based pultrusion composite materials are prepared by continuous reinforcing fibers and various resins through a pultrusion process, and are widely used in aerospace, construction, electrical, and industrial, agricultural and other fields. With the progress of the times, the performance requirements of resin-based pultruded composite materials are getting higher and higher, among which the strength, flexibility, heat resistance and other performance requirements of composite materials are the main requirements, and the composite materials are required to improve physical properties. At the same time, it has good processing performance. [0003] The reinforcing fibers of pultru...

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Problems solved by technology

However, due to the limitation of the performance of the resin itself, the performance of the existing composite material is single, and it is impossible to meet the needs of all properties at the same time.

For example: Chinese patent CN02117884.4A discloses a fiber-reinforced pultruded composite material for continuous sucker rods, using carbon fiber as the reinforcing fiber, using vinyl ester resin as the matrix, and the pultrusion speed is 0.2-2m / min, but In the production process, the fiber surface treatment furnace must be used to burn off the glue layer on the surface of the carbon fiber and improve the interface performance between the fiber and the resin matrix, but the thermal deformation temperature of the prepared composite material only reaches 131°C-147°C

[0004] Chinese patent ZL200410039473 discloses a resin matrix mixed with phenolic vinyl ester resin and bisphenol A vinyl ester resin and its carbon fiber pultruded composite material. The glass transition temperature of the composite material can reach 153°C-162°C , but in the production process it is also necessary to burn off the adhesive layer on the surface of the carbon fiber, which partially loses the strength of the carbon fiber

[0005] At the same time, epoxy resin is often used in the preparation of pultruded composite materials due to its good bonding performance, excellent interface properties of composite materials, mechanical properties and heat resistance compared with unsaturated resin matrices. The pultrusion molding process requires high resin activity, fast curing speed, and curing within 1 to 3 minutes. However, the curing of epoxy resin is characterized by ring-opening and gradual polymerization, slow reaction speed, high molding temperature, and low production efficiency, which is difficult to meet Rapid pultrusion requirements

[0006] In the prior art, by modifying some thermosetting resins with excellent performance or by adding some functional additives, it is expected to improve the performance of resin-based pultrusion composites in all aspects at the same time, but the results are not ideal, some of which are not good, and some The process is complex, and it is difficult to achieve mass production of high-performance resin-based pultrusion composites

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