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Novel low-viscosity bio-based epoxy resin composition and carbon fiber composite material

A technology based on epoxy resin and composite material, which is applied in the field of new low-viscosity bio-based epoxy resin composition and carbon fiber composite material, and can solve the problems of reduced strength, carbon fiber damage, and insufficient practicability.

Active Publication Date: 2020-02-18
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these traditional surface treatment methods have obvious advantages and disadvantages
For example, chemical treatment methods can increase the active groups on the surface of carbon fibers, thereby enhancing the interaction with the matrix: but they often cause damage to carbon fibers and reduce their strength.
The physical sizing method can prevent the carbon fiber from fluffing and opening during transportation and processing without affecting its mechanical properties, and may even improve it: However, the sizing method often cannot make the carbon fiber form a strong chemical interaction with the matrix
Patent CN107057283A and patent CN106046682A respectively disclose methods for improving the interfacial bonding force of carbon fiber and epoxy resin, but use expensive raw materials such as graphene and carbon nanotubes, which have insufficient practicability; and these nanomaterials are dispersed in composite materials poor sex
Patents CN110172228A and CN110172229 respectively disclose the preparation method of lignin epoxy resin / carbon fiber reinforced composite material, but the prepared lignin epoxy resin is solid and needs to be heated and melted, which increases the difficulty of processing

Method used

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  • Novel low-viscosity bio-based epoxy resin composition and carbon fiber composite material
  • Novel low-viscosity bio-based epoxy resin composition and carbon fiber composite material
  • Novel low-viscosity bio-based epoxy resin composition and carbon fiber composite material

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preparation example Construction

[0039] A method for preparing a low-viscosity bio-based epoxy resin composition of the present invention, comprising:

[0040] Step 1: Mix the raw materials; the mixing can be directly mixed according to the type of curing agent, or when the curing agent is an amine curing agent, the amine curing agent and the bio-based epoxy resin can be heated separately and then mixed ; The heating temperature is preferably 60-90 ° C;

[0041] Step 2: Curing the fully mixed raw materials at 60-90°C for 2-6 hours, then curing at 91-120°C for 2-6 hours, and then curing at 121-150°C for 3-5 hours to obtain the low-viscosity bio-based epoxy resin composition.

[0042] The present invention also provides a carbon fiber composite material, which comprises:

[0043]

[0044] Described bio-based epoxy resin, it has the structure shown in formula (1):

[0045]

[0046] The curing agent is an acid anhydride curing agent or an amine curing agent. The acid anhydride curing agent is preferably m...

Embodiment 1

[0063] The preparation of embodiment 1 bio-based epoxy resin

[0064] Step 1. Add 0.3mol powdered itaconic acid, 0.1mol glycerin, 50ml toluene, and 5wt% catalyst methanesulfonic acid into a three-neck round bottom flask, one of which is equipped with a stirrer and the other for nitrogen flow, a third neck toluene reflux and azeotropic distillation apparatus, the internal temperature was set to 150 °C and the reaction was continued for 10 hours. From toluene, gradually extract the condensed release water (1.5mol); Anhydrous toluene is continuously refluxed in the reactor to obtain product 1; the nuclear magnetic spectrum is as figure 2 shown.

[0065] Step 2. Add the mixture of product 1 (0.1mol), THF (100ml) and DMF (catalyst, 0.05ml) to a round-bottomed flask, and add oxalyl chloride (0.3mol) drop by drop within 20min in an ice-water bath at 0°C . The reaction mixture was slowly heated and reacted at 50 °C for 4 hours until the solid was completely dissolved. The resulti...

Embodiment 2

[0071] Embodiment 2 The preparation of bio-based epoxy resin / methyltetrahydrophthalic anhydride / three (dimethylaminomethyl) phenol composition solidification

[0072] After taking 100g of bio-based epoxy resin, add 60g of methyltetrahydrophthalic anhydride curing agent and 0.2g of tris(dimethylaminomethyl)phenol accelerator according to the proportion, stir and mix evenly, and then put it into a vacuum oven to remove Air bubbles in the resin. Place the mold coated with release agent in the oven, pour epoxy resin into the mold, and then cover the upper part with a 2kg iron plate, set the temperature at 80°C / 3 hours, 100°C / 3 hours, 120°C / 3 hours The curing can be completed within 1 hour, and the cured composition (4mm thick dumbbell-shaped sample) is taken out for use in tensile testing experiments.

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Abstract

The invention provides a novel low-viscosity bio-based epoxy resin composition and a carbon fiber composite material, and belongs to the field of epoxy resin compositions. The epoxy resin compositioncomprises the following components in parts by weight: 100 parts of bio-based epoxy resin and 1-70 parts of a curing agent, and the bio-based epoxy resin has a structure as shown in a formula (1). Theinvention also provides a carbon fiber composite material which comprises the following components in parts by weight: 15-30 parts of bio-based epoxy resin, 10-20 parts of a curing agent, 0.1-0.3 part of an accelerant and 25-50 parts of a carbon fiber material, and the bio-based epoxy resin has a structure as shown in a formula (1). The composition has excellent mechanical properties, and when the low-viscosity epoxy resin and the carbon fiber are compounded, the wettability of the low-viscosity epoxy resin and the carbon fiber is improved due to the fact that the low-viscosity epoxy resin and the carbon fiber have low enough viscosity, and the interface adhesiveness of the low-viscosity epoxy resin and the carbon fibers can be improved due to enough epoxy functional groups.

Description

technical field [0001] The invention belongs to the field of epoxy resin compositions, and in particular relates to a novel low-viscosity bio-based epoxy resin composition and a carbon fiber composite material. Background technique [0002] Carbon fiber (CF) is a special fiber with high carbon content obtained by high-temperature carbonization of organic fibers in an inert gas. It has the intrinsic characteristics of carbon materials and is fibrous, soft, and can be added to various It is a new generation of reinforced fiber. Carbon fiber has excellent properties such as high strength, high modulus, high temperature resistance, low density, friction resistance, corrosion resistance, and electrical and thermal conductivity. Because its graphite microcrystalline structure is preferentially oriented along the fiber axis, it has high strength and modulus along the fiber axis. Under the same volume, its weight is less than 1 / 4 of that of steel. The tensile strength of carbon fi...

Claims

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Application Information

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IPC IPC(8): C08G59/32C08L63/00C08K7/06
CPCC08G59/3218C08K7/06C08L63/00
Inventor 尚垒敖玉辉庄海林刘浏杜巍峰马岩石飞郭宗伟
Owner CHANGCHUN UNIV OF TECH
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