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Photocuring method of large-area dark fiber cloth epoxy composite material

A technology of composite materials and cloth epoxy, which is applied in the light curing of fiber cloth epoxy composite materials and the field of light curing of large-area dark fiber cloth epoxy composite materials, and can solve curing termination, resin cracking, and resin system preparation steps cumbersome and other problems, to achieve the effects of reduced viscosity, smooth surface, high reactivity and mechanical properties

Active Publication Date: 2021-06-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a photocuring method for large-area dark-colored fiber cloth epoxy composite materials, which solves the following four problems: one is the complicated problem of resin system preparation steps, and the other is that it does not increase the cost. Under the premise of solving the problem of premature termination of curing caused by large-scale heat dissipation, the third is to solve the problem of storage stability, and the fourth is to solve the problem of resin cracking under high heat

Method used

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  • Photocuring method of large-area dark fiber cloth epoxy composite material
  • Photocuring method of large-area dark fiber cloth epoxy composite material
  • Photocuring method of large-area dark fiber cloth epoxy composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: curing large area carbon fiber epoxy composite material

[0033] Resin formula: bisphenol A epoxy resin, accounts for 60% of total mass, 15g; Photoinitiator diphenyliodonium antimonate, accounts for 2% of total mass, 0.5g; Thermal initiator benzopinacol, accounts for 2% of the total mass, 0.5g; active solvent 3,3'-(oxybis(methylene))bis(3-ethoxyethane), 20% of the total mass, 5g; toughening agent 201 poly Esters, accounting for 15.5% of the total mass, 3.875g; heat-conducting particles of aluminum nitride, accounting for 0.5% of the total mass, 0.125g.

[0034] The carbon fiber cloth is first cut into a circle with a diameter of 14 cm, and then a piece is cut parallel to the diameter at a distance of 1 cm from the circumference to reserve a heat accumulation area. Cutting diagrams such as figure 1 shown.

[0035] Put the three layers of cut carbon fiber cloth into a round silicone mold with a diameter of 14 cm.

[0036] Dissolve the photoinitiator and ...

Embodiment 2

[0039] Embodiment 2: curing large-area silicon rubber cloth epoxy composite material

[0040]Storage resin formula: bisphenol A epoxy resin, accounting for 65% of the total mass, 195g; thermal initiator benzopinacol, accounting for 2% of the total mass, 6g; active solvent 3,3'-(oxybis(methylene base)) bis(3-ethoxyethane), accounting for 20.6% of the total mass, 61.8g; toughening agent 201 polyester, accounting for 12% of the total mass, 36g; 0.4%, 1.2g.

[0041] Dissolve the thermal initiator in an active solvent and dissolve it completely by ultrasonication for 5 minutes. Add epoxy resin, toughening agent and heat-conducting particles, and mechanically stir for 10 min to obtain 300 g of a resin system that can be stored stably.

[0042] One month later, 30 g of the stored resin was weighed, 0.6 g of photoinitiator diphenyliodonium antimonate was added thereto, and mechanically stirred for 3 min. Put the system into a 90°C oven and heat for 15 minutes. The silicone cloth i...

Embodiment 3

[0044] Embodiment 3: curing large area carbon fiber epoxy composite material

[0045] Resin formula: bisphenol A epoxy resin, accounting for 30% of the total mass, 7.5g; bisphenol S epoxy resin, accounting for 30% of the total mass, 7.5g; photoinitiator diphenyliodonium antimonate, accounting for 2 % of the total mass, 0.5 g; thermal initiator benzopinacol, 2 % of the total mass, 0.5 g; active solvent 3,3'-(oxybis(methylene))bis(3-ethoxy Ethane), accounting for 20% of the total mass, 5g; toughening agent 201 polyester, accounting for 15.5% of the total mass, 3.875g; heat-conducting particles aluminum nitride, accounting for 0.5% of the total mass, 0.125g.

[0046] The carbon fiber cloth is first cut into a square with a side length of 8cm, and then a square with a side length of 4mm is cut at one corner to reserve a heat accumulation area. Put the five layers of cut carbon fiber cloth into the silicone mold.

[0047] Dissolve the photoinitiator and thermal initiator in the a...

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Abstract

The invention discloses a photocuring method of a large-area dark fiber cloth epoxy composite material, wherein the method comprises the following steps: 1, adding a thermal initiator into an active solvent, stirring and dissolving, and then adding epoxy resin, a toughening agent and heat-conducting particles; 2, cutting fiber cloth, and then reserving a heat accumulation area; 3, putting the fiber cloth into a mold, and placing the mold on the horizontal plane of a heat insulation plate; adding a photoinitiator into a resin system, uniformly stirring, defoaming and heating; and rapidly injecting 2 / 3 of the resin system into a mold, after the surface resin completely immerses the fiber cloth, injecting the remaining resin into the mold, standing, and levelling the surface of the resin; and 4, performing illumination in a heat accumulation area, and stopping illumination until the whole system is completely solidified after the heat accumulation area is completely solidified. According to the method, a large amount of resin system can be prepared in advance, a proper amount of mixed photoinitiator can be taken as required when curing is needed, the mixed photoinitiator can be immersed into the fiber cloth for curing after being heated, the steps are simple and easy to operate, and the cost is low.

Description

technical field [0001] The invention belongs to the field of curing epoxy composite materials, and relates to a photocuring method for fiber cloth epoxy composite materials, in particular to a photocuring method for large-area dark fiber cloth epoxy composite materials. Background technique [0002] Fibers play an important supporting role in epoxy resins, so fiber-combined epoxy composites have excellent mechanical properties. There are many types of fiber cloth. For some common dark fiber cloths, such as carbon fiber cloth, when dipped with epoxy resin, the overall color is also dark, so it is difficult to achieve deep curing through light curing. It is also difficult to cure large-area resin systems by heat because it is difficult to control the temperature of the entire system to maintain uniformity. [0003] Existing literature (Zhao Peizhong, Yu Zhouhui, Su Hongbo, Dai Jingtao. Self-propagating light-curing resin and its carbon fiber composite material light-curing be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/02C08L67/00C08L77/10C08K3/28C08K3/38C08K7/06
CPCC08K2003/282C08K2003/385C08L63/00C08L2205/16C08L67/00C08K3/28C08K3/38C08K7/06C08L77/10
Inventor 成中军张静张东杰刘宇艳谢志民
Owner HARBIN INST OF TECH
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