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CN-121975470-A - High-strength epoxy adhesive and preparation method thereof

CN121975470ACN 121975470 ACN121975470 ACN 121975470ACN-121975470-A

Abstract

The invention discloses a high-strength epoxy adhesive and a preparation method thereof, and relates to the technical field of epoxy adhesives, wherein the epoxy adhesive comprises 80-120 parts of epoxy resin, 20-40 parts of curing agent, 10-35 parts of ethylene propylene diene monomer rubber powder, 5-20 parts of toughening resin, 30-80 parts of inorganic filler, 0.5-3 parts of coupling agent, 0.5-2 parts of auxiliary agent and the preparation based on the formula. According to the invention, ethylene propylene diene monomer rubber powder is introduced into an epoxy resin system and matched with toughening resin, inorganic filler and coupling agent for collaborative design, so that the adhesive has higher bonding strength and structural stability, and meanwhile, the shock resistance and deformation adaptability of a cured adhesive layer are obviously improved, and the obtained high-strength epoxy adhesive has good mechanical property, construction performance and engineering adaptability, and is suitable for popularization and application under various complex working conditions.

Inventors

  • QIU HAOYUN
  • LONG LIQUN

Assignees

  • 广东阿普邦新材料科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260227

Claims (10)

  1. 1. The high-strength epoxy adhesive is characterized by comprising the following components in parts by mass: 80-120 parts of epoxy resin; 20-40 parts of curing agent; 10-35 parts of ethylene propylene diene monomer rubber powder; 5-20 parts of toughening resin; 30-80 parts of inorganic filler; 0.5-3 parts of coupling agent; 0.5-2 parts of auxiliary agent.
  2. 2. The high-strength epoxy adhesive according to claim 1, wherein the ethylene propylene diene monomer rubber powder is modified ethylene propylene diene monomer rubber powder obtained through modification treatment, ethylene propylene diene monomer rubber with a Mooney viscosity in a range of 40-70 is selected as a basic raw material, and is cut into rubber particles with a particle size of not more than 5 mm.
  3. 3. The high-strength epoxy-based adhesive according to claim 2, wherein the modification treatment of the ethylene propylene diene monomer rubber powder comprises: placing rubber particles in a closed low-temperature freezing device 80 ℃ To Freezing at 120deg.C for 30-60 min; then, the frozen and embrittled rubber particles are sent into an air flow mill for crushing treatment, the air flow pressure is controlled to be 0.6-0.9MPa in the crushing process, the average particle size of the obtained rubber powder is controlled to be 20-80 mu m, and after crushing, the rubber powder is subjected to grading treatment through a vibrating screen, and coarse particles with the particle size exceeding 100 mu m are removed; then, placing the sieved rubber powder into high-speed mixing equipment for activation treatment; Finally, the treated rubber powder is dried in vacuum at the temperature of 60-80 ℃ for 4-8 hours to remove residual volatile matters, and the modified ethylene propylene diene monomer rubber powder is obtained.
  4. 4. A high strength epoxy-based adhesive according to claim 3, wherein the activation treatment comprises: Adding a surface activation treatment agent according to 0.5-3% of the mass of rubber powder in high-speed mixing equipment, and simultaneously carrying out high-speed stirring treatment at 60-90 ℃, wherein the stirring rotation speed is controlled at 800-1500rpm, and the treatment time is 20-40 minutes; By this treatment, a uniform activation layer is formed on the surface of the rubber powder.
  5. 5. The high-strength epoxy adhesive according to claim 1, wherein the inorganic filler is an interface-enhanced inorganic filler obtained by surface conditioning treatment, and inorganic mineral powder with a particle size of 1-10 μm is selected as a base material.
  6. 6. The high strength epoxy-based adhesive of claim 5, wherein the surface conditioning treatment of the inorganic filler comprises: adding inorganic mineral powder into deionized water to form slurry with the mass fraction of 20-40%, and pre-dispersing the slurry in a mechanical stirring mode for 15-30 minutes; Transferring the pre-dispersed slurry into wet grinding equipment for refining treatment; After the treatment is completed, inorganic filler is separated from the slurry in a filtering mode; drying the separated inorganic filler at 80-110deg.C for 6-12 hr to control the water content below 0.5%.
  7. 7. The high strength epoxy-based adhesive of claim 6, wherein the detailing process comprises: the grinding time is controlled to be 30-90 minutes, after grinding is finished, the slurry is heated to 50-70 ℃, and a surface regulator is added under the condition of continuous stirring, wherein the addition amount is 0.3-2% of the mass of the inorganic filler; After the surface regulator is added, stirring reaction is continued for 30-60 minutes, so that the surface regulator is fully adsorbed or combined on the surface of the inorganic filler.
  8. 8. The high-strength epoxy-based adhesive according to claim 1, wherein the epoxy resin is selected from one or a combination of two of bisphenol a type epoxy resin and bisphenol F type epoxy resin, wherein the epoxy resin has an epoxy equivalent of 180-230g/eq and is liquid or semi-liquid at normal temperature.
  9. 9. The high-strength epoxy-based adhesive according to claim 1, wherein the auxiliary agent is one or more selected from the group consisting of an antifoaming agent, a leveling agent, a plasticizer and a dispersing agent, wherein the antifoaming agent is an organosilicon antifoaming agent or a mineral oil type antifoaming agent, the leveling agent is an acrylic leveling agent, and the plasticizer is a phthalate or an environment-friendly plasticizer.
  10. 10. A method for preparing a high strength epoxy-based adhesive, based on the high strength epoxy-based adhesive of any one of claims 1-9, comprising the specific steps of: S1, adding epoxy resin into a stirring kettle, and stirring at a low speed under normal temperature to enable the epoxy resin to be in a uniform flow state; s2, gradually adding ethylene propylene diene monomer powder into the epoxy resin matrix system obtained in the step S1, and simultaneously increasing the stirring rotation speed to uniformly disperse the ethylene propylene diene monomer powder in the epoxy resin matrix to form a mixed system containing an elastic disperse phase; s3, after the ethylene propylene diene monomer powder is dispersed, adding inorganic filler into the mixed system in batches, and mixing under the condition of continuous stirring to ensure that the inorganic filler is gradually wetted by the resin system and uniformly dispersed; S4, after the inorganic filler is fully dispersed, adding a coupling agent into the system, and keeping stirring for a certain time to enable the coupling agent to form an effective interface effect among the resin phase, the inorganic filler and the ethylene propylene diene monomer rubber powder; s5, after interface regulation is completed, adding an auxiliary agent, and continuing stirring to uniformly disperse the auxiliary agent in the system; S6, after the mixing and adjustment of the components are completed, adding a curing agent into the system before use, and fully mixing in a specified time to uniformly distribute the curing agent in the adhesive system, so as to obtain a high-strength epoxy adhesive finished product.

Description

High-strength epoxy adhesive and preparation method thereof Technical Field The invention relates to the technical field of epoxy-based adhesives, in particular to a high-strength epoxy-based adhesive and a preparation method thereof. Background The epoxy adhesive has high bonding strength, good chemical resistance and wide applicable substrate range, and is widely applied to the fields of building structure reinforcement, waterproof engineering, composite material bonding, industrial assembly and the like. However, the existing high-strength epoxy adhesive is mostly used for improving the crosslinking density or increasing the content of inorganic filler as a main reinforcing means, and the tensile strength or the shearing strength can be improved to a certain extent, but the problems of increased brittleness and reduced impact resistance of the system are often accompanied, so that the adhesive layer is easy to crack or lose efficacy at interfaces under the conditions of external force impact, base layer deformation or temperature change, and the comprehensive performance requirements of high strength and high toughness are difficult to be met. On the other hand, in some prior art, although the epoxy system is modified by introducing rubber or flexible components, a simple blending mode is adopted, the dispersion state of the elastic modified components in the system and the interface effect between the elastic modified components, resin and filler are not subjected to system design, the problems of rubber aggregation, insufficient interface combination and the like are easy to occur, the toughening effect is weakened, and the workability and long-term stability of the adhesive are possibly adversely affected. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a high-strength epoxy adhesive and a preparation method thereof, which are used for solving the problems in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: the invention provides a high-strength epoxy adhesive, which comprises the following components in parts by mass: 80-120 parts of epoxy resin; 20-40 parts of curing agent; 10-35 parts of ethylene propylene diene monomer rubber powder; 5-20 parts of toughening resin; 30-80 parts of inorganic filler; 0.5-3 parts of coupling agent; 0.5-2 parts of auxiliary agent. According to the technical scheme, the ethylene propylene diene monomer rubber powder is modified ethylene propylene diene monomer rubber powder obtained through modification treatment, ethylene propylene diene monomer rubber with the Mooney viscosity in the range of 40-70 is selected as a basic raw material, and is cut into rubber particles with the particle size of not more than 5 mm. Further optimizing the technical scheme, the modification treatment of the ethylene propylene diene monomer rubber powder comprises the following steps: placing rubber particles in a closed low-temperature freezing device 80 ℃ ToFreezing at 120deg.C for 30-60 min; then, the frozen and embrittled rubber particles are sent into an air flow mill for crushing treatment, the air flow pressure is controlled to be 0.6-0.9MPa in the crushing process, the average particle size of the obtained rubber powder is controlled to be 20-80 mu m, and after crushing, the rubber powder is subjected to grading treatment through a vibrating screen, and coarse particles with the particle size exceeding 100 mu m are removed; then, placing the sieved rubber powder into high-speed mixing equipment for activation treatment; Finally, the treated rubber powder is dried in vacuum at the temperature of 60-80 ℃ for 4-8 hours to remove residual volatile matters, and the modified ethylene propylene diene monomer rubber powder is obtained. Further optimizing the technical scheme, the activation treatment comprises the following steps: Adding a surface activation treatment agent according to 0.5-3% of the mass of rubber powder in high-speed mixing equipment, and simultaneously carrying out high-speed stirring treatment at 60-90 ℃, wherein the stirring rotation speed is controlled at 800-1500rpm, and the treatment time is 20-40 minutes; By this treatment, a uniform activation layer is formed on the surface of the rubber powder. Further optimizing the technical scheme, the inorganic filler is an interface enhanced inorganic filler obtained by surface regulation treatment, and inorganic mineral powder with the particle size of 1-10 mu m is selected as a basic raw material. Further optimizing the technical scheme, the surface regulation treatment of the inorganic filler comprises the following steps: adding inorganic mineral powder into deionized water to form slurry with the mass fraction of 20-40%, and pre-dispersing the slurry in a mechanical stirring mode for 15-30 minutes; Transferring the pre-dispersed slurry into wet grinding equipment for refining treatment; After the treatment is co