CN-122011686-A - Core-shell fiber reinforced epoxy resin composite material and preparation method thereof

Abstract

The invention discloses a core-shell fiber reinforced epoxy resin composite material and a preparation method thereof, wherein the core-shell fiber reinforced epoxy resin composite material is UHMWPE fiber with a surface coated with a silicon dioxide nano layer, and through uniformly coating the surface with the SiO 2 nano layer, the interfacial bonding property of the fiber and an epoxy resin matrix is effectively improved, and the physical properties of the composite material are greatly improved. The invention has simple process and controllable cost, does not need complex equipment, and is suitable for large-scale production. The material can be widely applied to the fields of high-voltage insulating devices, high-power electronic packages, new energy motor insulating systems and the like with strict requirements on insulating and heat dissipation performance.

Inventors

• DENG JUN
• WU HENG
• ZHANG MINGZE
• SUN YONG
• CHI MINGHE
• ZHOU HAIBIN
• XIE ZHICHENG
• HE XUNJUN
• PAN ZHICHENG
• LV JINZHUANG
• YUE DONG
• CUI YANJIE
• FENG YU

Assignees

• 中国南方电网有限责任公司超高压输电公司电力科研院

Dates

Publication Date

20260512

Application Date

20260213

Claims (10)

1. 1. The core-shell fiber reinforced epoxy resin composite material is characterized by comprising the following raw materials of modified polyethylene fibers and epoxy resin; The modified polyethylene fiber comprises an ultra-high molecular weight polyethylene fiber, and the surface of the ultra-high molecular weight polyethylene fiber is coated with a silicon dioxide nano layer.
2. 2. The core-shell fiber reinforced epoxy resin composite of claim 1, wherein the method of preparing the modified polyethylene fiber comprises the steps of: Mixing ultra-high molecular weight polyethylene fiber, an alkaline catalyst, a template agent and a silicon source in a solvent, and performing condensation reaction to obtain ultra-high molecular weight polyethylene fiber coated with a silicon dioxide nano layer; And modifying the ultra-high molecular weight polyethylene fiber coated with the silicon dioxide nano layer by using a silane coupling agent to prepare the modified polyethylene fiber.
3. 3. The core-shell fiber reinforced epoxy resin composite of claim 2, wherein the silicon source comprises at least one of tetramethoxysilane, tetraethoxysilane, trimethylethoxysilane, ethyltriethoxysilane, propyltriethoxysilane.
4. 4. The core-shell fiber reinforced epoxy resin composite of claim 2, wherein the alkaline catalyst comprises at least one of ammonia water and sodium hydroxide; And/or the template agent comprises at least one of cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, didodecyl dimethyl ammonium chloride and didodecyl dimethyl ammonium bromide.
5. 5. The core-shell fiber reinforced epoxy resin composite of claim 2, wherein the reaction temperature of the condensation reaction is 50-80 ℃; and/or the reaction time of the condensation reaction is 8-16 h.
6. 6. The core-shell fiber reinforced epoxy resin composite of claim 2, wherein the ultra-high molecular weight polyethylene fiber to silicon source ratio is 1 g (2-6) mL.
7. 7. The core-shell fiber reinforced epoxy resin composite of claim 2, wherein the silane coupling agent comprises at least one of aminosilanes, epoxysilanes, vinylsilanes, mercaptosilanes, methacryloxysilanes.
8. 8. The method for preparing the core-shell fiber reinforced epoxy resin composite material according to any one of claims 1 to 7, which is characterized by comprising the following steps of softening/melting epoxy resin, mixing the softened/melted epoxy resin with a curing agent, an accelerator and modified polyethylene fibers, and carrying out a curing reaction to prepare the core-shell fiber reinforced epoxy resin composite material.
9. 9. The method for preparing the core-shell fiber reinforced epoxy resin composite material according to claim 8, wherein the mass percentage of the modified polyethylene fiber in the core-shell fiber reinforced epoxy resin composite material is 4% -15%.
10. 10. The method of preparing a core-shell fiber reinforced epoxy resin composite according to claim 8, wherein the curing temperature of the curing is 60-150 ℃.

Description

Core-shell fiber reinforced epoxy resin composite material and preparation method thereof Technical Field The invention belongs to the technical field of epoxy resin materials, and particularly relates to a core-shell fiber reinforced epoxy resin composite material and a preparation method thereof. Background Epoxy resins (EP) have good chemical resistance, processability, corrosion resistance and electrical insulation properties as typical insulation materials in packaged electronics. However, the epoxy is heated and solidified, and then the molecular chains thereof are crosslinked to generate a reticular structure, the system tends to be saturated, electrons which freely move inside are reduced, the relative molecular mass is larger, and the movement of the molecule is relatively difficult, so that the thermal conductivity is lower, and only 0.17-0.2W/(m.K), the current increasing heat dissipation requirement of the novel electronic device cannot be met, and therefore, the improvement of the thermal conductivity is a key for improving the heat dissipation problem of the whole packaging material. The current method for improving the heat conduction performance of the epoxy resin mainly comprises two approaches of intrinsic modification and filler reinforcement. Intrinsic modification improves the regularity of polymer chains through molecular design, but has complex process and limited improvement, and filler reinforcement builds a heat conduction network by introducing high heat conduction fillers (such as alumina, boron nitride, carbon nano tubes and the like), so that the method has more practical value. However, conventional filler reinforcement faces challenges in terms of filler dispersibility, interfacial compatibility, processability, etc., and after the inorganic filler is highly thermally conductive, thermal conductivity is improved while insulation properties are rapidly reduced. For example, ultra-high molecular weight polyethylene (UHMWPE) fibers have excellent thermal conductivity and high mechanical strength, and can be used as reinforcing phases to promote the thermal conductivity of composite insulation. However, the non-polar surface of the epoxy resin has poor adhesion with the epoxy resin, and direct compounding can introduce interface thermal resistance and insulation defects. There is a need to develop a new preparation process to improve the interfacial bonding problem of UHMWPE fibers in epoxy resin composite media. Disclosure of Invention In order to overcome the problems of the prior art, one of the purposes of the present invention is to provide a core-shell fiber reinforced epoxy resin composite. The second purpose of the invention is to provide a preparation method of the core-shell fiber reinforced epoxy resin composite material. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The first aspect of the invention provides a core-shell fiber reinforced epoxy resin composite material, which comprises the following raw materials of modified polyethylene fibers and epoxy resin; the modified polyethylene fiber comprises an ultra-high molecular weight polyethylene fiber (UHMWPE), and the surface of the ultra-high molecular weight polyethylene fiber is coated with a silica nano layer. Preferably, the preparation method of the modified polyethylene fiber comprises the following steps: Mixing ultra-high molecular weight polyethylene fiber, an alkaline catalyst, a template agent and a silicon source in a solvent, and performing condensation reaction to obtain ultra-high molecular weight polyethylene fiber coated with a silicon dioxide nano layer; And modifying the ultra-high molecular weight polyethylene fiber coated with the silicon dioxide nano layer by using a silane coupling agent to prepare the modified polyethylene fiber. Preferably, the method specifically comprises the steps of mixing ultrahigh molecular weight polyethylene fibers, an alkaline catalyst and a template agent in water to obtain a solution A, mixing a silicon source in an alcohol solvent to obtain a solution B, mixing the solution A and the solution B, and performing condensation reaction. More preferably, the alcohol solvent is selected from at least one of methanol, ethanol, isopropanol. More preferably, the ultra-high molecular weight polyethylene fiber to water usage ratio is 1g (100-300) mL. More preferably, the dosage ratio of the ultra-high molecular weight polyethylene fiber to the alcohol solvent is 1 g (2-6) mL. More preferably, the method further comprises the steps of adding the ultra-high molecular weight polyethylene fiber, the alkaline catalyst and the template agent into water, stirring and mixing at room temperature, and stirring and mixing at 50-70 ℃ to obtain the solution A. Preferably, the silicon source comprises at least one of tetramethoxysilane, tetraethoxysilane, trimethylethoxysilane, ethyltriethoxysilane, propyltriethoxysilane. Preferably, t