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CN-121973415-A - Bionic bone material for humanoid robot and preparation method thereof

CN121973415ACN 121973415 ACN121973415 ACN 121973415ACN-121973415-A

Abstract

The invention relates to the technical field of high-performance polymer composite materials, and discloses a bionic bone material for a humanoid robot and a preparation method thereof, wherein the bionic bone material comprises the steps of carrying out melt blending extrusion granulation on 50-75wt% of polyether-ether-ketone, 20-50wt% of modified fiber and 1-3wt% of antioxidant, then carrying out vibration injection molding by an injection molding machine, wherein the temperature of a mold is 160-200 ℃, and applying oscillation shearing with the frequency range of 0.05-2 Hz to a melt by piston reciprocating motion in the injection molding pressure maintaining stage. According to the invention, through regulating and controlling the flow and crystallization of the polymer composite material melt in the injection mold cavity, the internal fibers are promoted to be orderly arranged along the flow direction of the melt, the polymer matrix is further induced to form a columnar crystal structure on the surface of the polymer matrix, a reinforced structure similar to natural bone is constructed in a bionic way on a microscopic scale, and the mechanical property of the composite material is remarkably improved.

Inventors

  • XU JIAZHUANG
  • YAN MING
  • XIA PENGCHENG
  • ZHU GUIYING
  • WANG ZHIGUO
  • LI ZHONGMING

Assignees

  • 四川大学

Dates

Publication Date
20260505
Application Date
20260204

Claims (7)

  1. 1.A method for preparing bionic bone material for humanoid robots, which is characterized by comprising the following steps: S1, dissolving a silane coupling agent in a mixed solution of ethanol and water, regulating the pH value to 4-5 by using acetic acid, and stirring to prepare a hydrolysate; S2, mixing 50-75wt% of polyether-ether-ketone, 20-50wt% of modified fiber and 1-3wt% of antioxidant according to the total mass percentage of 100%, granulating by melt blending extrusion, and drying in vacuum at 80-90 ℃; The antioxidant is at least one of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-stearyl alcohol ester and tri [2, 4-di-tert-butylphenyl ] phosphite; S3, carrying out vibration injection molding on the dried extrusion granules obtained in the step S2, wherein the temperature of a used die is 160-200 ℃, and in the injection molding pressure maintaining stage, applying oscillation shearing with the frequency range of 0.05-2 Hz to the melt through reciprocating motion of a piston, and enabling the shearing flow to be continuous until a gate at a cavity opening of an injection molding machine is completely solidified.
  2. 2. The method for preparing the bionic bone material for the humanoid robot according to claim 1, wherein the silane coupling agent is selected from one or more of KH-550, KH-560 and A-151, and/or the fiber is selected from one or more of glass fiber and carbon fiber, and the diameter of the fiber ranges from 2 μm to 15 μm.
  3. 3. The method for preparing the bionic bone material for the humanoid robot according to claim 1, wherein the molecular weight of the polyether-ether-ketone is 6-12 ten thousand, and the melt flow rate is 10-30 g/10min.
  4. 4. The preparation method of the bionic bone material for the humanoid robot, which is characterized in that the antioxidant is compounded by beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-stearyl alcohol ester and tris [2, 4-di-tert-butylphenyl ] phosphite ester according to a mass ratio of 1-2:2-1.
  5. 5. The method for preparing the bionic bone material for the humanoid robot according to claim 1, wherein the melt blending adopts a double screw extruder, wherein the temperature of a melt plasticizing cylinder is 360-390 ℃, and the screw rotation speed is 50-150 rpm.
  6. 6. A biomimetic bone material, characterized in that it is produced by the preparation method according to any one of claims 1-5.
  7. 7. Use of the biomimetic bone material as claimed in claim 6 as a humanoid robot bone.

Description

Bionic bone material for humanoid robot and preparation method thereof Technical Field The invention relates to the technical field of high-performance polymer composite materials, in particular to a bionic bone material for a humanoid robot and a preparation method thereof. Background Humanoid robots are complex systems with human-like physical features and locomotor capabilities. The mechanical skeleton is used as a core supporting structure of the humanoid robot to directly determine the overall stability and the exercise performance of the humanoid robot. In order to improve comprehensive performance of the humanoid robot in various aspects such as movement flexibility, endurance capacity, energy efficiency and the like, the mechanical skeleton is required to meet requirements of light weight and high specific strength at the same time so as to meet urgent requirements of special application scenes such as high-load operation, aerospace and medical treatment of modern robots. The polymer material has low density, easy processing and forming and adjustable mechanical property, and can obviously reduce the weight of corresponding products by replacing metal materials. Polyether ether ketone (PEEK) is a typical high-performance special engineering plastic, the molecular chain of the PEEK contains a large number of rigid benzene rings, the mechanical property is outstanding, the chemical corrosion resistance is strong, and the PEEK is widely paid attention as a structural material in recent years. Compounding PEEK with reinforcing fillers (e.g., fibrous fillers) can improve its mechanical properties, mainly due to the high strength and modulus fibers being primarily loaded in the composite, providing strength and stiffness to the material. However, the conventional method has limited regulation and control effect on fiber arrangement in the composite material, and further improvement of mechanical properties of the composite material is limited. The human skeleton is a natural biological composite material, and the excellent mechanical property of the natural biological composite material is derived from the highly oriented arrangement of inorganic minerals such as hydroxyapatite and the like in the skeleton along the main stress direction of the skeleton, so that the natural biological composite material can obtain extremely large structural strength with extremely small mass, and is suitable for bearing and protecting functions. However, the prior art has limited regulation means for the arrangement of fibers in the polymer composite material, and is still difficult to construct a highly ordered bionic structure material similar to natural bone at present, so that the further deepening and expansion of the application of the material in a skeleton system of a humanoid robot are restricted. Therefore, there is an urgent need to develop an effective structure-controlling process preparation technology to obtain a high-performance composite material having a microstructure similar to that of natural bone. Disclosure of Invention In order to solve the technical problems, the invention provides a preparation method of a bionic bone material based on vibration injection molding, which is used for promoting internal fiber reinforcement phases to be orderly arranged along a specific direction by actively regulating and controlling the flow and solidification of a composite material melt in a cavity. Furthermore, the polymer melt can form columnar crystals on the surface of the oriented fiber to generate a reinforced structure with natural bone on a microscopic scale, and finally the mechanical property of the product is improved. To achieve the above object, in a first aspect, the present invention provides a method for preparing a bionic bone material for a humanoid robot, comprising the steps of: S1, dissolving a silane coupling agent in a mixed solution of ethanol and water, regulating the pH value to 4-5 by using acetic acid, and stirring to prepare a hydrolysate; S2, mixing 50-75wt% of polyether-ether-ketone, 20-50wt% of modified fiber and 1-3wt% of antioxidant according to the total mass percentage of 100%, granulating by melt blending extrusion, and drying in vacuum at 80-90 ℃; The antioxidant is at least one of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-stearyl alcohol ester and tri [2, 4-di-tert-butylphenyl ] phosphite; S3, carrying out vibration injection molding on the dried extrusion granules obtained in the step S2, wherein the temperature of a used die is 160-200 ℃, and in the injection molding pressure maintaining stage, applying oscillation shearing with the frequency range of 0.05-2 Hz to the melt through reciprocating motion of a piston, and enabling the shearing flow to be continued until a gate at a cavity opening of an injection molding machine is completely solidified. As a further preferable technical scheme of the invention, the silane coupling agent is selected from one o