MXene composite structure layer manufacturing method, explosion-proof structure manufacturing method and automobile bumper

Abstract

The invention belongs to the field of automobile bumper manufacturing, and particularly relates to an MXene composite structure layer manufacturing method, an anti-explosion structure and a bumper. According to the manufacturing method, a bidirectional freeze drying method is adopted for preparation, chitosan (CS) and MXene are prepared into a CS-MXene stent through a freeze dryer, then structural gaps of the CS-MXene stent are filled with a borosiloxane polymer silicone rubber matrix through a permeation-drying process, finally, the MXene composite structural layer is prepared, and the MXene composite structural layer is high in deformation resistance. The prepared MXene composite structure layers and the polyurea coatings are alternately combined layer by layer, the polyurea coatings are explosion-proof type polyurea coatings, the whole structure has the explosion-proof capacity, when the whole structure is impacted by high-speed external force, impact force and local stress can be dispersed through stress transfer between the layers, and the strength and toughness of the whole structure are improved.

Description

Technical Field

[0001] The present invention belongs to the field of automobile bumper manufacturing, and specifically relates to a MXene composite structure layer manufacturing method, an explosion-proof structure, and a bumper. Background Art

[0002] With the rapid development of the automotive industry and the frequent occurrence of traffic accidents around the world, ensuring the safety of car occupants has become a vital issue. In traffic accidents, the car bumper, as the front or rear device of the vehicle, has the important function of absorbing collision energy and reducing the damage caused by the collision to the occupants. However, the current car bumper's protection ability under extreme conditions such as high-speed impact or explosion still needs to be improved. Summary of the invention

[0003] In order to solve the above-mentioned problems existing in the prior art, the present invention provides, on the one hand, a MXene composite structural layer and a method for manufacturing an explosion-proof structure. The MXene composite structural layer dissipates impact energy through layer dislocation, layer interlocking and stress wave scattering, thereby improving the deformation resistance; the MXene composite structural layer is then alternately combined with explosion-proof coating layers, so that the whole has explosion-proof performance.

[0004] To achieve the above-mentioned purpose, the present invention provides a method for manufacturing a MXene composite structure layer, comprising the following steps: a) preparing a homogeneous CS-MXene solution from CS and MXene by a bidirectional freezing method, wherein a temperature gradient is generated in both the horizontal and vertical directions of the metal substrate during the bidirectional freezing process, and under the guidance of the temperature gradient, CS-MXene ice crystals nucleate and grow into a long-range lamellar structure; b) sublimating the CS-MXene solution obtained in step a) through a freeze dryer to obtain a CS-MXene bracket; c) annealing the CS-MXene bracket obtained in step b) in nitrogen to make the microstructure of the CS-MXene bracket corrugated; d) adding a borosiloxane polymer silicone rubber-acetone solution to the CS-MXene bracket obtained in step c) under the assistance of ultrasound, so that the borosiloxane polymer silicone rubber-acetone solution penetrates into the microstructure gap of the CS-MXene bracket; e) removing acetone from the CS-MXene bracket obtained in step d).

[0005] Furthermore, the CS-MXene scaffold prepared in step b) is composed of parallel arranged thin sheets.

[0006] On the other hand, the present invention provides a method for manufacturing an explosion-proof structure, comprising providing a MXene composite structure layer 1 prepared by any of the above-mentioned manufacturing methods; spraying a polyurea coating 1 and a polyurea coating 2 on the upper and lower surfaces of the MXene composite structure layer 1, respectively; spraying a MXene composite structure layer 2 on the polyurea coating 1; and spraying a polyurea coating 3 on the MXene composite structure layer 2.

[0007] Another aspect of the present invention provides an automobile bumper, comprising the explosion-proof structure prepared by the above method.

[0008] Compared with the prior art, the present invention has the following beneficial effects: 1. The microstructure of the MXene composite structure layer is connected together through supramolecular non-covalent interactions, in which the CS-MXene scaffold is a long-range layered skeleton with self-supporting effect; the interior of the CS-MXene scaffold is composed of a borosiloxane polymer silicone rubber matrix, which occupies the structural voids through the infiltration-drying process and provides strain rate enhanced bearing capacity; the MXene composite structure layer dissipates impact energy through layer dislocation, layer interlocking and stress wave scattering, significantly improving the deformation resistance.

[0009] 2. The MXene composite structure layer is then alternately combined with the explosion-proof coating layer, giving the whole an explosion-proof property.

[0010] 3. The anti-deformation and explosion-proof performance of the explosion-proof structure can be improved by more than 80%. DETAILED DESCRIPTION

[0011] The present invention is described in further detail below, wherein the raw materials used are commercially available and there are no special requirements.

[0012] The present invention provides a technical solution in one aspect: a method for manufacturing a MXene composite structure layer, comprising the following steps: a) A homogeneous CS-MXene solution was prepared by bidirectional freezing of CS and MXene. During the bidirectional freezing process, the metal substrate generated temperature gradients in both the horizontal and vertical directions. Under the guidance of the temperature gradient, CS-MXene ice crystals nucleated and grew into long-range lamellar structures. b) sublimating the CS-MXene solution obtained in step a) through a freeze dryer to obtain a CS-MXene scaffold; c) placing the CS-MXene scaffold obtained in step b) in nitrogen for annealing heat treatment so that the microstructure of the CS-MXene scaffold is corrugated; d) under the assistance of ultrasound, adding the borosiloxane polymer silicone rubber-acetone solution to the CS-MXene scaffold prepared in step c), so that the borosiloxane polymer silicone rubber-acetone solution penetrates into the microstructure voids of the CS-MXene scaffold; e) Removing acetone from the CS-MXene scaffold obtained in step d).

[0013] Specifically, the CS-MXene scaffold prepared in step b) is composed of parallel arranged thin sheets.

[0014] The microstructure of the MXene composite structure layer is connected together through supramolecular non-covalent interactions, in which the CS-MXene scaffold is a long-range layered skeleton with self-supporting effect; the interior of the CS-MXene scaffold is composed of a borosiloxane polymer silicone rubber matrix, which occupies the structural voids through the infiltration-drying process and provides strain rate enhanced bearing capacity; the MXene composite structure layer dissipates impact energy through layer dislocation, layer interlocking and stress wave scattering, significantly improving the deformation resistance.

[0015] On the other hand, the present invention provides a technical solution: a method for manufacturing an explosion-proof structure, comprising: providing a MXene composite structure layer 1 prepared by any of the above-mentioned manufacturing methods; spraying a polyurea coating 1 and a polyurea coating 2 on the upper and lower surfaces of the MXene composite structure layer 1, respectively; spraying a MXene composite structure layer 2 on the polyurea coating 1; and spraying a polyurea coating 3 on the MXene composite structure layer 2.

[0016] Specifically, polyurea coating one, polyurea coating two and polyurea coating three are composed of xylene diisocyanate prepolymer, polyetheramine, diamine chain extender, graphene and other various additives.

[0017] The MXene composite structure layer is alternately combined with the explosion-proof coating layer, making the whole have explosion-proof properties.

[0018] Another aspect of the present invention provides a technical solution: an automobile bumper, comprising the explosion-proof structure prepared by the above method.

[0019] After the explosion-proof structure is applied to the car bumper, the bumper's anti-deformation and explosion-proof performance can be improved by more than 80%.

[0020] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a MXene composite structure layer, characterized in that: The following steps are involved: a) A homogeneous CS-MXene solution was prepared by bidirectional freezing of CS and MXene. During the bidirectional freezing process, the metal substrate generated temperature gradients in both the horizontal and vertical directions. Under the guidance of the temperature gradient, CS-MXene ice crystals nucleated and grew into long-range lamellar structures. b) sublimating the CS-MXene solution obtained in step a) through a freeze dryer to obtain a CS-MXene scaffold; c) placing the CS-MXene scaffold obtained in step b) in nitrogen for annealing heat treatment so that the microstructure of the CS-MXene scaffold is corrugated; d) under the assistance of ultrasound, adding the borosiloxane polymer silicone rubber-acetone solution to the CS-MXene scaffold prepared in step c), so that the borosiloxane polymer silicone rubber-acetone solution penetrates into the microstructure voids of the CS-MXene scaffold; e) Removing acetone from the CS-MXene scaffold obtained in step d).

2. The method for manufacturing a MXene composite structure layer according to claim 1, characterized in that: The CS-MXene scaffold prepared in step b) is composed of parallel arranged thin sheets.

3. A method for manufacturing an explosion-proof structure, characterized in that: include: Providing a MXene composite structure layer prepared by the manufacturing method according to any one of claims 1 to 2; Spraying polyurea coatings on the upper and lower sides of the MXene composite structure layer respectively; Spraying a MXene composite structure layer on the polyurea coating; A polyurea coating is sprayed on the sprayed MXene composite structure layer.

4. A car bumper, characterized in that: The invention comprises an explosion-proof structure prepared by the method of claim 3.