Surface treatment method for enhancing adhesive property of epoxy resin adhesive-bonded joint

Abstract

The invention discloses a surface treatment method for enhancing the adhesive property of an epoxy resin adhesive-bonded joint. The surface treatment method comprises the following steps: before coating of an epoxy resin adhesive, coating a bonding interface of a base material with a resin solution, conducting standing for 2-4 hours, then coating the bonding interface with the epoxy resin adhesivefor bonding, and carrying out pressure curing, wherein the resin solution is formed by mixing resin and acetone, and the resin accounts for 5%-20% of the total mass of the resin solution, with the balance being acetone. The method is simple and convenient, good permeability and wettability can be provided for the bonding interface of the base material, the epoxy resin adhesive can be helped to permeate into micro-cracks and micro-pores in the surface layer of the base material, the contact area and bonding depth of the epoxy resin adhesive and the surface of the base material are increased, and the bonding performance of the bonded joint is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of surface treatment of epoxy resin adhesive joints, in particular to a surface treatment method for enhancing the bonding performance of epoxy resin adhesive joints. Background technique [0002] Bonding is to connect two materials or the bonding interface of the same material through adhesive (such as: epoxy glue). The basic principle of bonding is to form an adhesive force between the curing reaction of the adhesive itself and the bonding interface, and firmly connect the bonding interface and the adhesive into a whole. Compared with traditional mechanical connection joints, bonded joints have the advantages of uniform stress distribution, fewer parts, low cost, light weight, high connection efficiency, and convenient construction. Factors affecting the bonding performance of bonded joints mainly include the surface treatment method of the bonded interface, the bonding length, the type of adhesive, and t...

AI Technical Summary

Problems solved by technology

[0007] ①Narrow scope of application of materials

Although the surface blasting treatment can form a certain surface morphology on the surface of the material and increase the interface roughness, it is more destructive to the surface of the material and often causes structural damage to the surface layer of the material. Therefore, the surface blasting treatment is mostly used for rigid materials such as metal materials. materials, but less applications for materials such as wood

[0008] ② Poor technical controllability

Surface sandblasting can increase the roughness of the material surface, but this roughness is uncontrollable, and the surface morphology formed is irregular. The existing technology cannot achieve regular surface morphology on the material surface through sandblasting technology. , which can lead to large uncertainties in the adhesive properties of the structure

[0009] ③Poor surface wettability

The micro-cracks and micro-pores formed on the surface of the material by surface sandblasting make it difficult to completely wet the material surface, and it is difficult for the viscous epoxy resin with hardener to penetrate into the micro-cracks on the material surface, so that there is a gap between the adhesive and the interface. Micro-bubbles, these bubbles will cause stress concentration when the bonded joints bear the load, and form micro-cracks when they rupture, reducing the bonding performance of the bonded joint

[0010] ④ Difficult to clean

The effect of plasma modification on the surface of materials cannot be maintained for a long time, and it is time-sensitive. The number of polar groups introduced on the surface of materials by low-temperature plasma treatment will gradually decrease over time, the surface activity of materials will decrease, and the surface wettability will decrease. Moreover, in actual engineering, the uncertainty of environmental factors such as temperature and humidity makes it impossible to guarantee the effective time of plasma surface treatment, and it is impossible to grasp the construction time, which is not conducive to the normal development of construction progress.

[0014] ②Low temperature plasma technology is complicated

Both the low-temperature plasma treatment technology and the bonding process need to go through multiple processes. After the surface of the material is treated with low-temperature plasma, it needs to be strictly preserved and maintained, and transported to the construction site for bonding. The actual operation is complex and cumbersome And independent of each other, not suitable for construction sites full of emergencies

The complex and cumbersome process operation and the timeliness of plasma treatment itself make it difficult to achieve the desired effect in the surface treatment of materials in actual construction

[0015] ③High cost and strong dependence on equipment

[0018] ① Difficult to configure

The preparation process is cumbersome, requires precise control, and the reaction time is long, so it is not suitable for the needs of ready-to-use in actual work

[0019] ② High precision requirements, difficult to adapt to large-scale engineering sites

If the mass fraction of the coupling agent is too high, on the one hand, the processing cost will increase; A thin layer of coupling agent is formed, which greatly reduces the bonding strength of the material

If the mass fraction of the coupling agent is too small, part of the coupling agent will permeate into the wood fiber, resulting in a reduction of the residual coupling agent at the interface, failing to meet the requirements of good bridging, and making the effect of the coupling agent limited

Images