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Epoxy resin composite material synergistically toughened by reactive triblock acrylate polymer and nano silica, and preparation method of epoxy resin composite material

A technology of nano-silica and tough epoxy resin, which is applied in the field of polymer materials, can solve problems such as the precipitation of toughening agents, and achieve the effects of increased tensile strength, small modulus drop, and wide glass transition temperature distribution

Pending Publication Date: 2019-07-16
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, silica with nanocomposite structure and polyether triblock polymer or dendritic macromolecule are used as a toughening agent to toughen epoxy resin, but the polyether triblock polymer used cannot be combined with epoxy resin. Reactive, the obtained toughened epoxy resin will appear toughening agent precipitation after a certain period of time

Method used

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  • Epoxy resin composite material synergistically toughened by reactive triblock acrylate polymer and nano silica, and preparation method of epoxy resin composite material
  • Epoxy resin composite material synergistically toughened by reactive triblock acrylate polymer and nano silica, and preparation method of epoxy resin composite material
  • Epoxy resin composite material synergistically toughened by reactive triblock acrylate polymer and nano silica, and preparation method of epoxy resin composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Dissolve 3 g of reactive tri-block acrylate polymer in ethyl acetate, add 0.3 g of nano-silicon dioxide, heat and mechanically stir in an oil bath at 70°C for 2 h, then precipitate with anhydrous methanol and dry in the air.

[0027] (2) 100g of epoxy resin and 3.3g of the modified triblock acrylate polymer prepared in step (1), heated and mechanically stirred in an oil bath at 80°C for 1 hour, added 25.28g of DDM curing agent, and vacuumized after complete dissolution. Pour the product into a preheated iron mold, put it into an oven for curing at 70°C for 3 hours, and at 140°C for 1 hour.

Embodiment 2

[0029] (1) Dissolve 4 g of tri-block acrylate polymer in ethyl acetate, add 0.4 g of nano-silica, heat and mechanically stir in an oil bath at 75°C for 2.5 h, then precipitate with anhydrous methanol and dry in the air.

[0030] (2) 100g of epoxy resin and 4.4g of the modified triblock acrylate polymer prepared in step (1), heated and mechanically stirred in an oil bath at 85°C for 1 hour, added 25.28g of DDM curing agent, and vacuumized after complete dissolution. Pour the product into a preheated iron mold, put it into an oven for curing at 75°C for 3.5 hours, and at 145°C for 1.5 hours.

Embodiment 3

[0032] (1) Dissolve 5 g of tri-block acrylate polymer in ethyl acetate, add 0.5 g of nano-silica, heat and mechanically stir in an oil bath at 80°C for 3 h, then precipitate with anhydrous methanol and dry in the air.

[0033] (2) 100g of epoxy resin and 5.5g of the modified triblock acrylate polymer prepared in step (1), heated and mechanically stirred in an oil bath at 90°C for 1 hour, added 25.28g of DDM curing agent, and evacuated after complete dissolution. Pour the product into a preheated iron mold, put it into an oven for curing at 80°C for 4 hours, and at 150°C for 2 hours.

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Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to an epoxy resin composite material synergistically toughened by a reactive triblock acrylate polymerand nano silica, and a preparation method of the epoxy resin composite material. The preparation method comprises the following steps: (1) the reactive triblock acrylate polymer is grafted with the nano silicon dioxide at 70-90 DEG C to prepare a modified triblock polymer; and (2) the modified triblock polymer is mixed with epoxy resin and a curing agent, and then the mixture is poured into a preheating mould for curing. According to the invention, the nano silica and the reactive triblock acrylate polymer are used for synergistically toughening the epoxy resin, so that the effect is obvious,plane strain fracture toughness (KIC) is improved by 140-150% relative to pure epoxy resin, the tensile strength is improved by 15-25%, and the elasticity modulus is improved by 40-50%.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a reactive triblock acrylate polymer and nano silicon dioxide synergistically toughened epoxy resin composite material and a preparation method thereof. The epoxy resin prepared by this method has both Very good toughness and modulus of elasticity. Background technique [0002] Epoxy resin has excellent physical, mechanical and electrical insulation properties, excellent bonding properties with various materials, and the flexibility of its use process is not available in other thermosetting plastics. In the field of coatings, it has many characteristics such as excellent chemical resistance, strong adhesion to metal paint films, good heat resistance, electrical insulation and good color retention of paint films. However, there are a large number of epoxy groups in the epoxy resin molecule, and the crosslinking density is large, the elongation is low, the br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L53/00C08K9/06C08K3/36C08G59/50
CPCC08G59/5033C08K2201/011C08L63/00C08L53/00C08K9/06C08K3/36
Inventor 任强陈瑶葛攀峰林肯向玉玲范丽亚吕文达陈可欣周博豪汪称意李坚
Owner CHANGZHOU UNIV