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Method for improving interfacial bonding strength of aramid fiber reinforced composite

A technology for enhancing composite material and interface bonding strength, applied in the field of improving the interface bonding strength of aramid fiber reinforced composite materials, can solve the problems of damaged fiber surface structure and performance, high reaction conditions, poor interface bonding, etc. Improve mechanical properties and enhance the effect of adhesion

Inactive Publication Date: 2013-05-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, the modification methods of aramid fibers include chemical methods such as chemical grafting and surface coating, and physical methods such as cold plasma, γ-rays or ultrasonic waves on the surface, but there are problems when the above methods are used for modification. The investment is large, the reaction conditions are high, and there are many reaction equipments, and the interface bonding is poor; in addition, the above-mentioned methods such as chemical modification all damage the surface structure and performance of the fiber to varying degrees. Therefore, this patent discusses a physical modified aramid fiber Method for fiber surface structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for improving interfacial bond strength of aramid fiber reinforced composite material, characterized in that it comprises the following steps:

[0016] 1) To modify the aramid fiber, the specific method is: heat the polyvinylidene fluoride PVDF solution casting film to 195-205 ℃ for 10-15 minutes to eliminate the heat history, and then heat the polyvinylidene fluoride PVDF film at 50-60 ℃ Cool down to 168-170°C at a rate of / min, immediately apply tension to both ends and place the stretched aramid fiber or woven fabric on the surface of the supercooled polyvinylidene fluoride PVDF film and make close contact with it;

[0017] 2) Mechanically blend 10% to 20% of the aramid fiber modified in step 1 with 80% to 90% of epoxy resin, then put the mixed powder into the mold of the flat vulcanizer for molding, and first raise the temperature of the furnace To 135~145℃, keep for 50~60min, preform the preform, and control the pressure at 9~11 MPa;

[0018] 3) Rapidly r...

Embodiment 2

[0021] A method for improving interfacial bonding strength of aramid fiber reinforced composite material, comprising the following steps:

[0022] 1) To modify the aramid fiber, the specific method is: heat the solution-cast film of polyvinylidene fluoride PVDF to 200°C for 10 minutes to eliminate the heat history, and then cool the PVDF film to 170°C at a rate of 50°C / min , Immediately apply tension to both ends and place the stretched aramid fiber or woven cloth on the supercooled PVDF film surface and make close contact with it, observe the crystallization process and crystallization completion after the temperature is lowered to 170°C under a polarizing microscope The crystal structure of the epiphytic crystallized aramid short fiber was studied and improved by means of infrared spectroscopy (FTIR), scanning electron microscope (SEM), transmission electron microscope (TEM) and differential scanning calorimetry (DSC). The morphology, structure and performance of the surface...

Embodiment 3

[0029] A method for improving interfacial bonding strength of aramid fiber reinforced composite material, comprising the following steps:

[0030] 1) To modify the aramid fiber, the specific method is: heat the solution-cast film of polyvinylidene fluoride PVDF to 200°C for 10 minutes to eliminate the heat history, and then cool the PVDF film to 170°C at a rate of 50°C / min , Immediately apply tension at both ends and place the stretched aramid fiber or woven cloth on the surface of the supercooled PVDF film and make close contact with it, observe the crystallization process and crystallization completion after the temperature is lowered to 170°C under a polarizing microscope The crystal structure of the epiphytic crystallized aramid staple fiber was studied and improved by means of infrared spectroscopy (FTIR), scanning electron microscope (SEM), transmission electron microscope (TEM) and differential scanning calorimetry (DSC). The morphology, structure and performance of the...

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Abstract

The invention discloses a method for improving the interfacial bonding strength of an aramid fiber reinforced composite, which comprises the following steps: 1) modifying the aramid fiber; 2) mixing the modified aramid fiber with epoxy resin in a mechanical manner, then, placing the mixed powder into a press vulcanizer mould to be shaped, and pre-moulding the preformed blank; 3) rapidly increasing the temperature to 180-185 DEG C and maintaining for 50-60 minutes to mould the mould-pressed material, and removing the pressure when the temperature is decreased to 110 DEG C along with the furnace; and 4) taking out the mould-pressed composite material together with the mould, and cooling to the room temperature to obtain the composite material. The technique is simple, and the prepared composite material has excellent interfacial bonding strength and excellent mechanical property.

Description

technical field [0001] The invention belongs to the technical field of interface bonding strength of composite materials, and in particular relates to a method for improving the interface bonding strength of aramid-reinforced composite materials. Background technique [0002] Aramid fiber is widely used in aerospace and other fields because of its high strength, high modulus, corrosion resistance, wear resistance, strong toughness and excellent heat resistance, among which aramid fiber reinforced resin matrix composites It is the main application form of aramid fiber, accounting for about 70-80% of the total application of aramid fiber. However, due to the low polarity of the surface of the aramid fiber, its solubility and fatigue resistance are not good enough, its light resistance is poor, its shear performance is poor, and the fiber is easily microfibrillated and split. The chemical inertness and smooth surface of aramid fibers lead to smooth and low activity of the fibe...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L77/10C08L27/16C08L67/02C08L33/12C08J5/06
Inventor 王海军赵庭山王学川李文举冯会平
Owner SHAANXI UNIV OF SCI & TECH
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