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CN-121991464-A - High-strength and high-toughness epoxy resin material, and preparation method and application thereof

CN121991464ACN 121991464 ACN121991464 ACN 121991464ACN-121991464-A

Abstract

The invention discloses a high-strength and high-toughness epoxy resin material, and a preparation method and application thereof, and aims to solve the problems that the traditional epoxy resin is high in brittleness and difficult to consider both strength and toughness. The preparation method comprises the steps of carrying out surface modification on glass fiber by using an incomplete silane coupling agent to obtain modified glass fiber with partial silicon hydroxyl, synthesizing modified polyurethane with isocyanate groups at the tail end, directionally grafting the modified polyurethane and the modified polyurethane to form a compound, and mixing and curing the compound with epoxy resin and a curing agent to obtain the target material. The invention realizes normal high-strength and high-toughness stress cooperative performance through controllable defect manufacture and dynamic bond directional anchoring innovative design, has stable material structure, dynamic repair potential, can prolong service life, and is suitable for preparing coatings, electronic packaging materials and adhesives.

Inventors

  • KANG RUNHUA
  • WU ZHILONG

Assignees

  • 深圳市宏进科技有限公司

Dates

Publication Date
20260508
Application Date
20260126

Claims (10)

  1. 1. The preparation method of the high-strength and high-toughness epoxy resin material is characterized by comprising the following steps of: s1, carrying out surface modification on glass fiber by using an incomplete silane coupling agent to obtain modified glass fiber with partial silicon hydroxyl groups reserved on the surface; s2, synthesizing modified polyurethane with isocyanate groups at the tail ends; S3, carrying out directional grafting reaction on the modified polyurethane and the modified glass fiber, so that the modified polyurethane is grafted to the silicon hydroxyl on the surface of the modified glass fiber through the isocyanate group at the tail end of the modified polyurethane to form a compound; S4, mixing the compound with epoxy resin and a curing agent, and curing to obtain the high-strength and high-toughness epoxy resin material.
  2. 2. The method for preparing the high-strength and high-toughness epoxy resin material according to claim 1, wherein in the step S1, the glass fiber is subjected to incomplete silane coupling agent surface modification, specifically, the cleaned glass fiber is placed in a partially hydrolyzed silane coupling agent solution and reacted for 20-40 minutes at 50-70 ℃.
  3. 3. The preparation method of the high-strength and toughness epoxy resin material according to claim 2, wherein the silane coupling agent is gamma- (2, 3-glycidoxy) propyl trimethoxy silane, and the silane coupling agent solution is prepared from the silane coupling agent, ethanol and deionized water according to the mass ratio of 1 (50-70) to 3-5.
  4. 4. The preparation method of the high-strength and high-toughness epoxy resin material according to claim 1, wherein in the step S2, the synthesis method of the modified polyurethane is characterized in that polyethylene glycol and excessive diisocyanate are reacted to generate a polyurethane prepolymer with isocyanate groups at the tail ends, and the polyurethane prepolymer and dithioglycol are subjected to chain extension reaction to obtain the modified polyurethane.
  5. 5. The method for preparing a high-strength and toughness epoxy resin material according to claim 4, wherein the polyethylene glycol is PEG-800, the diisocyanate is toluene diisocyanate, and the dithioglycol is dithiodiglycol.
  6. 6. The method for preparing the high-strength and high-toughness epoxy resin material according to claim 1, wherein in the step S3, the amount of the modified polyurethane is 8-12 parts by weight, and the amount of the modified glass fiber is 15-22 parts by weight; in the step S4, the epoxy resin is used in an amount of 95-105 parts by weight, the compound is used in an amount of 23-35 parts by weight, and the curing agent is used in an amount of 7.5-10.5 parts by weight.
  7. 7. The method for preparing a high-strength and high-toughness epoxy resin material according to claim 6, wherein the epoxy resin is bisphenol A type epoxy resin E44, and the curing agent is triethylene tetramine.
  8. 8. The method for preparing high-strength and toughness epoxy resin material according to claim 1, wherein in the step S4, the curing process is that pre-curing is carried out for 2-4 hours at 20-30 ℃, and then post-curing is carried out for 2-4 hours after heating to 70-90 ℃.
  9. 9. A high strength and toughness epoxy resin material obtained by the method of any one of claims 1 to 8.
  10. 10. Use of the high strength and toughness epoxy resin material according to claim 9 for preparing a coating, an electronic packaging material or an adhesive.

Description

High-strength and high-toughness epoxy resin material, and preparation method and application thereof Technical Field The invention belongs to the technical field of epoxy resin, and relates to a high-strength and high-toughness epoxy resin material, and a preparation method and application thereof. Background Epoxy resins are a type of high molecular compound containing two or more epoxy groups in the molecular structure, and are important in many fields by virtue of their excellent comprehensive properties. The composite material has the outstanding advantages of high bonding strength, excellent mechanical property, strong chemical corrosion resistance, good electrical insulation property, low shrinkage, good compatibility with various base materials and the like, and is widely applied to the fields of composite materials, adhesives, electronic and electrical packaging, coating, aerospace, rail transit, construction engineering, precision machinery manufacturing and the like. However, epoxy resin has the defects of high crosslinking density, strong molecular chain segment rigidity, inherent brittleness, poor impact resistance, low fracture toughness and the like after being cured, and is easy to crack, peel and even fail when being subjected to external force impact, vibration or temperature change, thereby severely limiting the application of the epoxy resin in scenes with higher requirements on toughness. Disclosure of Invention The invention aims to provide a high-strength and high-toughness epoxy resin material, and a preparation method and application thereof, so as to solve the problem of high brittleness of the traditional epoxy resin and realize the cooperative improvement of strength and toughness. The aim of the invention can be achieved by the following technical scheme: in a first aspect, the invention provides a preparation method of a high-strength and high-toughness epoxy resin material, which comprises the following steps: s1, carrying out surface modification on glass fiber by using an incomplete silane coupling agent to obtain modified glass fiber with partial silicon hydroxyl groups reserved on the surface; s2, synthesizing modified polyurethane with isocyanate groups at the tail ends; S3, carrying out directional grafting reaction on the modified polyurethane and the modified glass fiber, so that the modified polyurethane is grafted to the silicon hydroxyl on the surface of the modified glass fiber through the isocyanate group at the tail end of the modified polyurethane to form a compound; S4, mixing the compound with epoxy resin and a curing agent, and curing to obtain the high-strength and high-toughness epoxy resin material. Preferably, in the step S1, the step of carrying out incomplete silane coupling agent surface modification on the glass fiber is specifically that the cleaned glass fiber is placed in a partially hydrolyzed silane coupling agent solution and reacted for 20-40 minutes at 50-70 ℃. Preferably, the silane coupling agent is gamma- (2, 3-glycidoxy) propyl trimethoxy silane, and the silane coupling agent solution is prepared from silane coupling agent, ethanol and deionized water according to the mass ratio of 1 (50-70) to 3-5. Preferably, in the step S2, the synthesis method of the modified polyurethane comprises the steps of reacting polyethylene glycol with excessive diisocyanate to generate a polyurethane prepolymer with isocyanate groups at the tail ends, and then carrying out chain extension reaction on the polyurethane prepolymer and dithioglycol to obtain the modified polyurethane. Preferably, the polyethylene glycol is PEG-800, the diisocyanate is toluene diisocyanate, and the dithioglycol is dithiodiglycol. Preferably, in the step S3, the dosage of the modified polyurethane is 8-12 parts by weight, and the dosage of the modified glass fiber is 15-22 parts by weight; in the step S4, the epoxy resin is used in an amount of 95-105 parts by weight, the compound is used in an amount of 23-35 parts by weight, and the curing agent is used in an amount of 7.5-10.5 parts by weight. Preferably, the epoxy resin is bisphenol a type epoxy resin E44, and the curing agent is triethylene tetramine. Preferably, in the step S4, the curing process is that the pre-curing is carried out for 2-4 hours at 20-30 ℃, and then the post-curing is carried out for 2-4 hours after the temperature is raised to 70-90 ℃. In a second aspect, the invention provides a high-strength and high-toughness epoxy resin material obtained by the preparation method according to the first aspect. In a third aspect, the invention provides an application of the high-toughness epoxy resin material in the second aspect in preparing a coating, an electronic packaging material or an adhesive. The invention has the beneficial effects that: (1) The invention overturns the traditional modification logic for eliminating interface defect, and makes dynamic disulfide bond anchored only at stress concentration site by