CN-121989528-A - Shape-following reinforced repairing sheet of composite material packaging box and preparation and use methods thereof

Abstract

The invention discloses a composite material packing box conformal reinforcing repair sheet and a preparation and use method thereof, and belongs to the technical field of composite material repair. The invention aims to solve the technical problems that the traditional repair material is insufficient in structural reinforcement capability, interfaces are easy to fall off, special-shaped curved surfaces are difficult to adapt to and the like, and an ultrathin micro honeycomb core layer is arranged between an elastic transition adhesive film layer and a fiber putty layer containing curing agent microcapsules, so that interface stress is buffered by utilizing gradient modulus design, and shape-following attachment is realized by means of ultrathin and semi-cured design. The invention can realize the structural reinforcement and appearance repair integration of the damaged area, remarkably simplifies the construction process by triggering the microcapsule to release the curing agent through heating, improves the repair efficiency, has excellent compatibility with vinyl resin base materials, and is suitable for the rapid maintenance of various composite material packaging boxes.

Inventors

• XIA JUN
• KONG DELI
• WANG YAN
• JING WENQI
• LI NAN

Assignees

• 航天特种材料及工艺技术研究所

Dates

Publication Date

20260508

Application Date

20260213

Claims (10)

1. 1. The composite material packing box conformal reinforcement repairing piece is characterized by comprising an elastic transition adhesive film layer, a micro honeycomb core layer and a fiber putty layer which are paved in sequence; The elastic transition adhesive film layer is a nitrile rubber modified vinyl resin adhesive film, and the elastic modulus of the elastic transition adhesive film layer is between the micro honeycomb core layer and the fiber putty layer; The micro honeycomb core layer is an aramid micro honeycomb core; the fiber putty layer is vinyl resin putty containing chopped fibers and curing agent microcapsules.
2. 2. The composite packing case conformal reinforcement repair patch of claim 1, wherein the thickness of the elastic transition film layer is 0.1-0.2mm.
3. 3. The composite packing box conformal reinforcement repair patch of claim 1, wherein said microcellular core layer has a thickness of 0.5-1mm.
4. 4. The composite packing box conformal reinforcement repair patch of claim 1, wherein the shell material softening temperature of the curing agent microcapsules is 60-80 ℃.
5. 5. The composite package conformal reinforcement patch of claim 1, wherein said curing agent microcapsules comprise a curing agent and a thermoplastic shell material surrounding the curing agent.
6. 6. The composite package form-fitting reinforcement patch of claim 1, wherein the chopped fibers are chopped glass fibers or chopped spandex fibers.
7. 7. The composite packing box conformal reinforcement repair patch of claim 6, wherein the chopped fiber is added in an amount of 10% -20% of the total mass of the fiber putty layer.
8. 8. The composite package conformal reinforcement repair patch of claim 1, wherein said fiber putty layer further comprises a color paste of the same color system as the original paint surface of the package.
9. 9. A method for preparing the composite packing box conformal reinforcing repair patch according to any one of claims 1-8, comprising the following steps: cutting an aramid micro honeycomb core, taking the aramid micro honeycomb core as a micro honeycomb core layer, coating the surface of the aramid micro honeycomb core with vinyl resin diluent, and airing for later use; mixing nitrile rubber and vinyl resin, adding an initiator, uniformly stirring, coating the mixture on one side surface of an aramid micro honeycomb core, and pre-curing to form an elastic transition adhesive film layer; Adding chopped fibers, curing agent microcapsules and color paste into vinyl resin, uniformly stirring at a high speed, coating the mixture on the surface of the other side of the aramid micro honeycomb core, and pre-curing to form a fiber putty layer; and compounding the three-layer structure, paving release paper on the outer side after compounding, and winding the release paper on a die to prepare the coiled material.
10. 10. A method of using the composite packing box conformal reinforcement patch of any one of claims 1-8, comprising the steps of: Cutting out a repair patch with a corresponding size according to the size of the damaged part; after cleaning the surface of the damaged part, manually bending the repairing piece to make the repairing piece fit on the curved surface of the damaged part along with the shape; Heating the repair sheet to crack the curing agent microcapsule and release the curing agent to finish curing; and after solidification and cooling, polishing the surface of the repair sheet to enable the repair sheet to be flush with the original surface of the packing box.

Description

Shape-following reinforced repairing sheet of composite material packaging box and preparation and use methods thereof Technical Field The invention relates to the technical field of composite material repair, in particular to a composite material packing box conformal reinforcing repair sheet and a preparation and use method thereof. Background The composite material packaging box is widely applied in the fields of aerospace, military equipment, precise instrument transportation and the like due to light weight, high strength and excellent weather resistance. However, in the process of long-term turnover and loading and unloading of the packaging box, local damage or structural damage caused by collision inevitably occurs, so that the efficient after-sales repair technology is important for prolonging the service life of the packaging box. At present, the traditional repair of the composite material packaging box mostly adopts a process of filling putty and spraying finishing paint. In practice, however, this process exposes the following major drawbacks: 1. the putty is an unstructured filling material, the reinforcing phase of the putty consists of particles, the matrix consists of unsaturated polyester resin, the putty can only repair surface pits, and can not provide effective mechanical support and structural reinforcement for damaged parts, and the putty has the hidden trouble of secondary cracking after repair for a packing box with cracks or penetrating damage. 2. The interfacial compatibility is poor and the composite material base materials such as putty and vinyl or epoxy are easy to fall off, and the composite material base materials have weaker chemical compatibility, so that failure phenomena such as cracking and peeling of a repair layer are easy to occur due to mismatching of the thermal expansion coefficient and the elastic modulus under the temperature difference change or transportation vibration environment. 3. The traditional repair process involves a plurality of manual processes such as putty knife coating, drying, multiple polishing, primer spraying, finish spraying and the like, so that a single repair period is usually as long as several hours, and the requirement of after-sale quick maintenance is difficult to meet. 4. Although some fiber reinforced putty materials appear in the prior art, the aim is to improve the cracking resistance, but the materials are in paste form, and the construction is highly dependent on manual blade coating experience. Especially when facing special-shaped areas or complex curved surfaces, the pasty material is difficult to ensure the thickness uniformity and structural compactness of the repair layer, and complex curing agent proportioning procedures are often needed to be matched. Therefore, how to develop a composite material packing box rapid repair material with shape-following fit and strong compatibility and capable of simplifying the construction process has become a technical topic to be solved in the art. Disclosure of Invention The invention aims to provide a composite material packing box conformal reinforcing repair sheet and a preparation and use method thereof. Aiming at the technical problems that the traditional putty repairing process is insufficient in structural reinforcement capability, poor in interface compatibility, easy to crack and fall off, complicated in construction procedure, difficult to adapt to special-shaped curved surface repairing and the like, the gradient modulus design is introduced, so that the problem of repairing interface cracking is effectively solved, the repairing structure is accurately matched with the mechanical property of the original packaging box, and a hidden mechanical reinforcing layer can be formed in a special-shaped curved surface area. Finally, the purposes of enhancing the interface connection stability, realizing shape-following reinforcement by utilizing a micro honeycomb structure and greatly improving the repair efficiency and the appearance consistency by means of a microcapsule temperature control release mechanism are achieved. In order to achieve the above purpose, the present invention provides the following technical solutions. A composite material packing box conformal reinforcement repair patch comprises an elastic transition adhesive film layer, a micro honeycomb core layer and a fiber putty layer which are paved in sequence; The elastic transition adhesive film layer is a nitrile rubber modified vinyl resin adhesive film, and the elastic modulus of the elastic transition adhesive film layer is between the micro honeycomb core layer and the fiber putty layer; The micro honeycomb core layer is an aramid micro honeycomb core; the fiber putty layer is vinyl resin putty containing chopped fibers and curing agent microcapsules. Further, the thickness of the elastic transition adhesive film layer is 0.1-0.2mm. Further, the thickness of the micro honeycomb core layer is 0.5-1mm. Furthe