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Preparation method of rare earth modified fanglun fiber/epoxy composite material

A technology of aramid fibers and composite materials, which is applied in fiber processing, textiles, and papermaking. It can solve problems such as unsatisfactory processing effects, fiber damage, and affecting fiber strength. It is suitable for large-scale industrial production and improves engineering application value. The effect of improving the interface binding force

Inactive Publication Date: 2004-07-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, preliminary achievements have been made in the research of aramid fiber surface treatment process and engineering application research, but there are still some problems, for example: plasma surface treatment is a continuous method, but the processing speed is slow (only 0.7 m / min), which cannot match the dipping speed (6-10m / s); the surface of the fiber is roughened by etching, oxidation, etc., although the mechanical bonding force between the fiber and the epoxy resin is improved, but it will affect the The fiber causes damage and affects the strength of the fiber itself; the coupling agent treatment method has a simple process and can be processed in large quantities, but the interface layer treated by the coupling agent will decompose at a higher working temperature, and the impact resistance and radiation resistance of the interface The ability is poor, resulting in a decline in the performance of the composite material, and the fibers are easily bonded together after the coupling agent treatment, and the industrial property is not good; the treatment effect of most surface treatment methods is not ideal, and the strength conversion rate of the fiber in the composite material is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The raw materials used include: aramid fiber is F-12 aramid fiber; epoxy resin is E-51 epoxy resin (618 resin) produced by Shanghai Resin Factory; curing agent is 593 (modified aromatic amine) at room temperature Hardener;

[0029] The weight percent of each component of the rare earth modifier is: lanthanum chloride: 0.2%, ethanol: 98.62%, ethylenediaminetetraacetic acid (EDTA): 0.05%, ammonium chloride: 0.1%, nitric acid: 0.03%, urea: 1%.

[0030] Firstly, the aramid fibers were pretreated, and three reagents were used for reflux cleaning, namely acetone, toluene, and deionized water. Each reagent was treated for 3 hours, and then dried in an oven at 110°C.

[0031] The pretreated fibers were immersed in the rare earth modifier, soaked for 2 hours, and dried in an oven at 90°C for 5 hours.

[0032] The epoxy resin and the curing agent are prepared according to the weight ratio of 100:25 to prepare the glue solution, and the modified aramid fiber is immersed in the e...

Embodiment 2

[0035] The raw materials used include: Kevlar fiber produced by DuPont; the epoxy resin is the epoxy resin (618 resin) of E-51 produced by Shanghai Resin Factory; Kimidazole.

[0036] The weight percent of each component of the rare earth modifier is: 1% of cerium chloride; 97.27% of ethanol; 0.5% of ethylenediaminetetraacetic acid (EDTA); 1% of ammonium chloride; 0.2% of nitric acid;

[0037] The surface pretreatment of the fiber is the same as in Example 1.

[0038] The pretreated fibers were immersed in the rare earth modifier, soaked for 3 hours, and dried in an oven at 100°C for 4 hours.

[0039] The epoxy resin and the curing agent are prepared in a weight ratio of 100:7 to prepare a glue solution, and the modified aramid fiber is immersed in the epoxy glue solution, and the volume percentage of the epoxy glue solution to the aramid fiber is 1:3.8. After the fibers are impregnated with glue, use a flat mandrel to carry out parallel winding on a circular numerical contr...

Embodiment 3

[0042]The raw materials used are the same as in Example 2, only the ratio of the rare earth modifier and the fiber treatment process are changed.

[0043] The weight percent of each component of the rare earth modifier is: 2% of lanthanum oxide; 96.49% of ethanol; 0.25% of ethylenediaminetetraacetic acid (EDTA); 0.06% of ammonium chloride; 0.5% of nitric acid;

[0044] The pretreated fibers were immersed in the rare earth modifier, soaked for 4 hours, and dried in an oven at 110°C for 3 hours.

[0045] The fibers treated above were made into a unidirectional aramid fiber reinforced epoxy composite material according to the composite material molding process in Example 2.

[0046] According to the GB3352-82 standard, the shear strength of the composite material is 73.6MPa.

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Abstract

A RE modified aramid fibre / epoxy composite is prepared through pretreating the surface of aramid fibres, using RE modifier to modify the surface of aramid fibres, mixing epoxy resin with solidifying agent, soaking the aramid fibres in the mixture, winding on plate die, infrared baking, cutting the soaked fabric, laminating, and thermal die pressing. Its advantages are high mechanical performance and low cost.

Description

Technical field: [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a rare-earth modified aramid fiber / epoxy composite material, specifically, aramid fiber that has been surface-modified by a rare-earth modifier is used to fill epoxy resin Composite materials can improve the bonding force of the interface of the aramid fiber / epoxy composite material, thereby improving the practical engineering application value of the composite material. Background technique: [0002] Aramid fiber is a high-performance organic fiber with properties such as ultra-high strength, ultra-high modulus, high temperature resistance and light specific gravity. Its strength is more than 3 times higher than that of ordinary organic fibers, its modulus is 10 times that of nylon, and 9 times that of polyester; its relative strength is equivalent to 6 to 7 times that of steel wire, and its modulus is about 2 to 3 times that of steel wire an...

Claims

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Application Information

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IPC IPC(8): C08J5/06C08L63/00D06M11/00
Inventor 程先华吴炬
Owner SHANGHAI JIAO TONG UNIV
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