Polyether-ether-ketone / aluminum-based composite material and preparation method thereof

Abstract

The invention discloses a polyether-ether-ketone / aluminum-based composite material and a preparation method thereof. The polyether-ether-ketone / aluminum-based composite material comprises the following raw materials in parts by volume: 40-60 parts of polyether-ether-ketone particles and 40-60 parts of Al powder, and the Al powder is soaked in a rare earth modified solvent. The preparation method comprises the following steps: carrying out oxidation film removal treatment on the surface of aluminum powder, then carrying out surface treatment on the aluminum powder by adopting a rare earth modified solvent in an ultrasonic environment, then preparing a prefabricated material from the treated aluminum powder and polyether-ether-ketone, and finally carrying out mold pressing curing molding to prepare the polyether-ether-ketone / aluminum-based composite material. The rare earth modified solvent is a rare earth mixture containing cerium chloride and lanthanum chloride. The method disclosed by the invention is simple and easy to implement, low in cost, energy-saving and environment-friendly, and the prepared polyether-ether-ketone / Al-based composite material has excellent mechanical properties and thermal expansion characteristics and is particularly suitable for being applied to pipeline sealing in special environments.

Description

Technical Field

[0001] The invention relates to the field of composite materials for pipeline seals, and in particular to a polyetheretherketone / aluminum-based composite material and a preparation method thereof. Background Art

[0002] Polyetheretherketone (PEEK) is a special engineering plastic with excellent properties such as high temperature resistance, self-lubrication, easy processing and high mechanical strength. It can be manufactured and processed into various mechanical parts. In pipeline sealing, as a material for sealing, PEEK has unique advantages in wear resistance, hydrolysis resistance, insulation, solubility resistance and aging resistance. However, the low expansion of PEEK causes the pipeline to expand when heated or contract when cooled. The PEEK seal cannot match the pipeline well, which easily produces a sealing gap and causes pipeline leakage. In order to improve the matching between PEEK seals and pipelines and reduce pipeline maintenance costs, it is of great significance to propose a polyetheretherketone / aluminum-based composite material and a preparation method. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a polyetheretherketone / aluminum-based composite material and a preparation method thereof, which has the characteristics of energy saving and environmental protection, simple process and low cost. The rare earth modified solvent used in the present invention can well improve the interface bonding strength between PEEK particles and Al powder, thereby improving the overall mechanical properties of the composite material.

[0004] In a first aspect, the present invention provides a polyetheretherketone / aluminum-based composite material, which is realized by adopting the following technical solution.

[0005] A polyetheretherketone / aluminum-based composite material comprises the following raw materials in parts by volume: 40-60 parts of polyetheretherketone particles and 40-60 parts of Al powder, wherein the Al powder is Al powder treated by soaking in a rare earth modified solvent.

[0006] Preferably, the polyetheretherketone / aluminum-based composite material comprises the following raw materials in volume fractions: 45-55 parts of polyetheretherketone particles and 45-55 parts of Al powder. More preferably, the polyetheretherketone / aluminum-based composite material comprises the following raw materials in volume fractions: 50 parts of polyetheretherketone particles and 50 parts of Al powder.

[0007] By adopting the above technical scheme, the present invention introduces Al powder material with an expansion coefficient twice higher than that of Fe-based materials into the PEEK matrix as an auxiliary agent to improve the expansion performance of PEEK seals, thereby improving the expansion matching of PEEK seals and pipelines. Due to the large performance difference between Al powder and PEEK particles, the interface adhesion between Al powder and PEEK particles is poor, resulting in crack initiation in the PEEK / Al-based composite material, which reduces the overall mechanical properties of the composite material. In order to solve this problem, the present invention proposes to use rare earth modified solvents to introduce rare earth elements into the interface structure of PEEK / Al-based composite materials, using rare earth elements as connecting links to form an interface structure with higher bonding performance, thereby improving the toughness of the interface of PEEK / Al-based composite materials, and increasing the overall mechanical properties and thermal expansion properties of the composite material. The patent of the present invention proposes that the use of PEEK / Al-based composite materials as materials for pipeline seals can extend the service life of pipeline seals.

[0008] Furthermore, the particle size of the Al powder is 100 nanometers to 200 nanometers.

[0009] Furthermore, the rare earth modified solvent comprises the following components in parts by volume: 15 parts of rare earth compound, 45-60 parts of ethanol, 20-40 parts of deionized water, 4 parts of sodium carbonate, 5-10 parts of ethylenediaminetetraacetic acid, and 3-5 parts of urea.

[0010] Furthermore, the rare earth compound consists of 7-8 parts by volume of lanthanum chloride and 7-8 parts by volume of cerium chloride.

[0011] In a second aspect, the present invention provides a method for preparing a polyetheretherketone / aluminum-based composite material, which is achieved by adopting the following technical solution.

[0012] A method for preparing the above-mentioned polyetheretherketone / aluminum-based composite material comprises the following steps:

[0013] S1. The dried Al powder was soaked in a nitric acid solution for 0.1-0.12 hours, and then soaked in anhydrous ethanol for 0.4-0.6 hours;

[0014] S2. The treated Al powder was immersed in a rare earth modified solvent under an ultrasonic environment for 2.5-3 hours, filtered and dried;

[0015] S3. A predetermined amount of polyetheretherketone particles and a predetermined amount of Al powder obtained by the treatment in step S2 are mixed, laid in a mold preheated at 150°C-170°C, heated to 320°C-390°C, kept warm for 0.5-0.6 hours, a pressure of 5Mpa-6Mpa is applied, and the pressure is maintained for 30 minutes-40 minutes, and then cooled to room temperature;

[0016] S4. Heat again to 180°C-200°C and keep warm for 0.9-1.1 hours to obtain a polyetheretherketone / Al-based composite material.

[0017] Furthermore, in step S1, the Al powder is baked at 100-120° C. for 0.5-0.6 hours.

[0018] Furthermore, in step S1, the concentration of the nitric acid solution is 5-15wt%.

[0019] Preferably, in step S3, the applied pressure is 5.5 MPa and the pressure is maintained for 35 minutes.

[0020] Preferably, in step S4, the heating temperature is 200° C. and the temperature is kept for 1 hour.

[0021] This application has the following beneficial effects.

[0022] The present invention introduces rare earth elements into the interface structure of the PEEK / Al-based composite material. With the help of the special electronic layer structure and excellent chemical activity of the rare earth elements, the interface bonding strength of the composite material can be improved, thereby increasing the overall mechanical properties of the composite material. The thermal expansion performance of the PEEK / Al-based composite material prepared by the method of the present invention is similar to that of the metal pipeline, and can be matched with the pipeline, and it is not easy to produce a sealing gap, causing pipeline leakage. The method of the present invention is simple in process, low in cost, energy-saving and environmentally friendly. DETAILED DESCRIPTION

[0023] The present patent application is further described below in conjunction with embodiments.

[0024] The materials used in the preparation process of the following examples were not further processed unless otherwise specified and were purchased from commercial sources.

[0025] Example 1

[0026] A method for preparing a polyetheretherketone / aluminum-based composite material, characterized in that it comprises the following steps:

[0027] (1) 100-200 nanometer Al powder was baked in a 120°C drying oven for 0.6 hours to remove surface moisture; (2) the dried Al powder was immersed in a 10 wt% nitric acid solution for 0.1 hour, and then immersed in anhydrous ethanol for 0.5 hour; (3) a rare earth modified solvent was prepared using the following components by volume: 7.5 parts of lanthanum chloride, 7.5 parts of cerium chloride, 50 parts of ethanol, 40 parts of deionized water, 4 parts of sodium carbonate, 5 parts of ethylenediaminetetraacetic acid, and 5 parts of urea; (4) the treated Al powder was immersed in the rare earth modified solvent under an ultrasonic environment for 3 hours. After filtering, dry and place in a drying container for later use; (5) preheat the metal mold to 170°C; (6) stir and mix 50 parts by volume of PEEK particles and 50 parts by volume of Al powder treated by soaking in a rare earth modified solvent to obtain a mixed powder, and spread it on the mold; (7) heat the mold to 370°C and keep it warm for 30 minutes; (8) apply an axial pressure of 6 MPa; (9) keep the pressure for 40 minutes and cool to room temperature; (10) then heat the mold to 180°C and keep it warm for 1 hour to eliminate the internal stress of the composite material, thereby obtaining a PEEK / Al-based composite material.

[0028] Example 2

[0029] The difference between this embodiment and embodiment 1 is that the rare earth modified solvent is prepared by 8 parts of lanthanum chloride, 7 parts of cerium chloride, 47 parts of ethanol, 30 parts of deionized water, 4 parts of sodium carbonate, 10 parts of ethylenediaminetetraacetic acid, and 3 parts of urea.

[0030] Example 3

[0031] The difference between this embodiment and embodiment 1 is that there are 40 parts of PEEK particles and 60 parts of Al powder.

[0032] Example 4

[0033] The difference between this embodiment and embodiment 1 is that the axial molding pressure is 5 MPa.

[0034] Example 5

[0035] The difference between this embodiment and embodiment 1 is that in step (10), the heating temperature is 200°C.

[0036] Comparative Example 1

[0037] The difference between this comparative example and Example 1 is that the Al powder is not treated by soaking in a rare earth modified solvent.

[0038] With reference to GB / T 1040.1-2018 standard, the mechanical properties of the polyetheretherketone / aluminum-based composite materials prepared in Example 1 and Comparative Example 1 were tested. The experimental results show that compared with Comparative Example 1, the mechanical properties of the composite material in Example 1 are improved by 10%.

[0039] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A polyetheretherketone / aluminum-based composite material, characterized in that: The invention comprises the following raw materials in proportions by volume: 40-60 parts of polyetheretherketone particles and 40-60 parts of Al powder, wherein the Al powder is Al powder soaked in a rare earth modified solvent.

2. The polyetheretherketone / aluminum-based composite material according to claim 1, characterized in that: The particle size of the Al powder is 100 nanometers to 200 nanometers.

3. The polyetheretherketone / aluminum-based composite material according to claim 1, characterized in that: The rare earth modified solvent comprises the following components in parts by volume: 15 parts of rare earth compound, 45-60 parts of ethanol, 20-40 parts of deionized water, 4 parts of sodium carbonate, 5-10 parts of ethylenediaminetetraacetic acid, and 3-5 parts of urea.

4. The polyetheretherketone / aluminum-based composite material according to claim 3, characterized in that: The rare earth compound consists of 7-8 parts by volume of lanthanum chloride and 7-8 parts by volume of cerium chloride.

5. A method for preparing the polyetheretherketone / aluminum-based composite material according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. The dried Al powder was soaked in a nitric acid solution for 0.1-0.12 hours, and then soaked in anhydrous ethanol for 0.4-0.6 hours; S2. The treated Al powder was immersed in a rare earth modified solvent under an ultrasonic environment for 2.5-3 hours, filtered and dried; S3. A predetermined amount of polyetheretherketone particles and a predetermined amount of Al powder obtained by the treatment in step S2 are mixed, laid in a mold preheated at 150°C-170°C, heated to 320°C-390°C, kept warm for 0.5-0.6 hours, a pressure of 5Mpa-6Mpa is applied, and the pressure is maintained for 30 minutes-40 minutes, and then cooled to room temperature; S4. Heat again to 180°C-200°C and keep warm for 0.9-1.1 hours to obtain a polyetheretherketone / Al-based composite material.

6. The method for preparing a polyetheretherketone / aluminum-based composite material according to claim 5, characterized in that: The Al powder is dried as follows: in step S1, the Al powder is baked at 100-120°C for 0.5-0.6 hours.

7. The method for preparing a polyetheretherketone / aluminum-based composite material according to claim 5, characterized in that: The drying method of Al powder is as follows: in step S1, the concentration of nitric acid solution is 5-15wt%.