Wear-resistant self-lubricating resin for composite surface layer structure and preparation method thereof

Abstract

This invention discloses a wear-resistant self-lubricating resin for composite surface layer structures and its preparation method, belonging to the field of composite surface layer technology. It includes a matrix resin component A, a lubricating component B, a curing agent component C, and a coupling agent component D. Reactive functional groups are introduced onto the surface of solid lubricating particles through coupling agent component D. This invention uses a silane coupling agent to perform surface grafting modification on PTFE and MoS₂, introducing reactive functional groups onto the particle surface. These functional groups participate in the curing and crosslinking network of the epoxy resin, forming a "chemically bonded interface." This structure allows the lubricating particles to wear uniformly in the form of a "molecular brush" during friction, while deep lubricating particles are continuously exposed and replenished to the friction interface, achieving a long-term mechanism of lubrication reserve and continuous release. The low surface energy of PTFE fills the gaps in the transfer film, forming a "continuous, dense, low surface energy" composite lubricating film on the mating surface. This synergistic effect significantly reduces the coefficient of friction.

Claims

1. A wear-resistant self-lubricating resin for composite material surface layer structures, characterized in that, It consists of the following components in parts by weight: Matrix resin component A: 30-90 parts; Lubricating component B: 5-30 parts; Curing agent component C: 1-30 parts; Coupling agent component D: 1–30 parts; The lubricating component B is a surface-grafted modified solid lubricating particle, and the solid lubricating particle contains at least two types: polytetrafluoroethylene and molybdenum disulfide. The surface grafting modification refers to the introduction of reactive functional groups onto the surface of solid lubricating particles through coupling agent component D. The reactive functional groups are selected from at least one of hydroxyl, carbonyl, or carbon-carbon unsaturated bonds.

2. The wear-resistant self-lubricating resin for composite material surface layer structures according to claim 1, characterized in that, In the lubricating component B, the mass ratio of polytetrafluoroethylene to molybdenum disulfide is 1-3:0.5-2.

3. The wear-resistant self-lubricating resin for composite material surface layer structures according to claim 1, characterized in that, The matrix resin component A comprises at least glycidylamine type epoxy resin and glycidyl ether type epoxy resin, and the mass ratio of the two is 0.5-2:1-3.

4. The wear-resistant self-lubricating resin for composite material surface layer structures according to claim 1, characterized in that, The matrix resin component A further comprises fluorinated epoxy resin and liquid crystal epoxy resin, wherein the fluorinated epoxy resin and liquid crystal epoxy resin account for 10% to 50% of the total mass of matrix resin component A.

5. The wear-resistant self-lubricating resin for composite material surface layer structures according to claim 1, characterized in that, The coupling agent component D is a silane coupling agent with reactive unsaturated double bonds, and the matrix resin component A contains an epoxy resin with unsaturated double bonds. During the curing process, the unsaturated double bonds on the surface of lubricating component B undergo a copolymerization reaction with the unsaturated double bonds in the matrix resin component A, forming chemical bonds.

6. The wear-resistant self-lubricating resin for composite material surface layer structures according to claim 1, characterized in that, The curing agent component C is an amine curing agent, selected from one or more of aliphatic amines, cycloaliphatic amines, polyamides, aromatic amines, or phenolic amines; The coupling agent component D is selected from one or more of aminosilane, epoxysilane, methacryloxysilane, mercaptosilane, or vinylsilane.

7. A method for preparing a wear-resistant self-lubricating resin for a composite material surface layer structure according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Preparation of modified solid lubricating particles: a. Mix 50-100 parts of ethanol, 10-50 parts of deionized water and 1-30 parts of coupling agent component D, adjust the pH to 5-6, and obtain the coupling agent hydrolysate; b. Disperse 5 to 30 parts of solid lubricating particles in ethanol, and disperse by ultrasonication and stirring 3 to 5 times to obtain a solid lubricating particle dispersion; c. Add the solid lubricating particle dispersion obtained in step b to the coupling agent hydrolysate obtained in step a, and reflux at 30-70°C for 5-15 hours. After the reaction is completed, filter, wash, dry, and grind to obtain modified solid lubricating particles. S2. Preparation of resin composite materials: a. Melt-blend matrix resin component A at 80–120°C; b. Cool to 60-80℃, add the modified solid lubricating particles prepared by S1, and disperse them using a planetary stirrer; c. Add curing agent component C and continue dispersing; d. After being collected by pressing with a press and degassed under vacuum, a wear-resistant self-lubricating resin composite material is obtained.

8. The method for preparing a wear-resistant self-lubricating resin for a composite material surface layer structure according to claim 7, characterized in that, In step S2b, the modified solid lubricating particles are added in batches, with the rotation speed of the planetary stirrer controlled at 30-100 r / min and the dispersion time at 10-30 min.

9. The method for preparing a wear-resistant self-lubricating resin for a composite material surface layer structure according to claim 7, characterized in that, The curing process of the wear-resistant self-lubricating resin composite material is as follows: pre-curing at 85°C for 1 hour, followed by curing at 130°C for 2 hours.

Images