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Two-dimensional covalent organic framework modified flexible fiber fabric and preparation method thereof

A covalent organic framework, flexible fiber technology, applied in the direction of fiber type, fiber treatment, textile and paper making, etc., can solve the problems of low friction coefficient, large local bearing load, thinning and drying of lubricating film, etc., to achieve optimal swing Effect of friction state, reduction of oscillating friction moment, good machinability

Active Publication Date: 2020-03-24
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] Polytetrafluoroethylene (PTFE) composite fiber fabric self-lubricating gasket material is essentially a fiber fabric-reinforced polymer-based composite material. In large self-lubricating rod end joint bearings, the dual size is larger, and the ball diameter is from 80mm ranges from 800 mm to 800 mm, the bearing may be subject to excessive local loads, severe friction conditions, and large friction torque during application. Using the existing PTFE composite fiber fabric self-lubricating liner to reduce friction has been difficult to meet the requirements of the application conditions. Due to the urgent requirement of low friction coefficient and long wear life, the existing anti-friction treatment of PTFE composite fiber fabric self-lubricating liner is mainly to apply lubricating oil, but there are the following problems: directly coating lubricating oil on the surface of the fiber fabric, Lubricating oil cannot be preserved implicitly on the surface of the fabric, and it will inevitably penetrate into the adhesive layer and cause soaking and swelling of the adhesive, which will have the opposite effect; coating lubricating oil, although the friction coefficient can be effectively reduced, but in During storage and transportation, the lubricating film formed on the surface of lubricating oil and friction pair is easy to become thinner and dry due to volatilization, and even oxidized by air to cause lubrication failure. This is mainly because the lubricating oil is exposed to the external atmosphere for a long time after being coated on the surface In the environment, the exchange of matter and energy with the external environment (such as air, moisture, corrosive gas, temperature, dust, light, etc.) cannot be avoided

Method used

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  • Two-dimensional covalent organic framework modified flexible fiber fabric and preparation method thereof
  • Two-dimensional covalent organic framework modified flexible fiber fabric and preparation method thereof
  • Two-dimensional covalent organic framework modified flexible fiber fabric and preparation method thereof

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preparation example Construction

[0034] The invention provides a method for preparing a two-dimensional covalent organic framework modified flexible fiber fabric, comprising the following steps:

[0035] Mix 2,4,6-tris(4-aminophenyl)-1,3,5-triazine and 2,5-dihydroxyterephthalaldehyde for polymerization to obtain a two-dimensional covalent organic framework;

[0036] Mix the two-dimensional covalent organic framework, tetrahydrofuran, diethyl azodicarboxylate, triphenylphosphine and PEG2000 for Mitsunobu etherification reaction to obtain 2D COF-PEG2000;

[0037] Mixing the 2D COF-PEG2000 and a dispersant to obtain a nano-lubricant impregnation solution;

[0038] The PTFE composite fiber fabric is soaked in the nano-lubricant impregnation solution and then dried to obtain the two-dimensional covalent organic framework modified flexible fiber fabric.

[0039] In the present invention, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine and 2,5-dihydroxyterephthalaldehyde are mixed and polymerized to obtain a two-dimension...

Embodiment 1

[0059] a. Preparation of two-dimensional covalent organic framework (2D COF):

[0060] 3.544 grams (0.01mol) of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine and 2.492 grams (0.015mol) of 2,5-dihydroxyterephthalaldehyde were loaded into the reaction In the bottle, after three cycles of "freezing-pumping-gassing", fill it with high-purity nitrogen, seal the reaction bottle, put it in a blast drying oven at 120°C for 3 days to complete the polymerization reaction, and obtain the phenolic hydroxyl group 2D COF brown-red powder, dry weight 5.30 g, yield about 96%. figure 1 It is the XRD pattern of 2D COF, and the assignment of each crystal plane parameter shows that a 2D COF material with a two-dimensional layered structure has been obtained.

[0061] b. Post-functionalization of 2D COF grafted with PEG2000 to prepare 2D COF-PEG2000:

[0062] Weigh 1.0 g of 2D COF powder into a reaction bottle and add 10.0 g of solvent tetrahydrofuran, 0.01 g (0.057 mmol) of diethyl azodicarboxylate ...

Embodiment 2

[0070] a. Preparation of two-dimensional covalent organic framework (2D COF):

[0071] 3.544 grams (0.01mol) of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine and 2.492 grams (0.015mol) of 2,5-dihydroxyterephthalaldehyde were loaded into the reaction In the bottle, after three cycles of "freezing-pumping-gassing", fill it with high-purity nitrogen, seal the reaction bottle, put it in a blast drying oven at 120°C for 3 days to complete the polymerization reaction, and obtain the phenolic hydroxyl group 2D COF brown-red powder, dry weight 5.30 g, yield about 96%;

[0072] b. Post-functionalization of 2D COF grafted with PEG2000 to prepare 2D COF-PEG2000:

[0073]Weigh 1.0 g of 2D COF powder into a reaction bottle and add 25.0 g of solvent tetrahydrofuran, 0.45 g (2.58 mmol) of diethyl azodicarboxylate as a catalyst and 0.45 g (1.72 mmol) of triphenylphosphine, then weigh 35.0 g ( 17.5mmol) PEG2000 was added, stirred at room temperature for 36 hours to complete the etherification rea...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention provides a two-dimensional covalent organic framework modified flexible fiber fabric and a preparation method thereof, and belongs to the field of fabrics. The modified flexible fiber fabric prepared by the method can be used for antifriction processing between the inner and outer spherical surfaces of a large self-lubricating rod end joint bearing, and the solid / oil composite lubrication effect is effectively achieved. On the premise that the flexibility and deformability of the PTFE composite fiber fabric is not lost, the surface friction coefficient of the PTFE composite fiberfabric and the swing friction torque between the inner and outer spherical surfaces of the rod end joint bearing are further reduced.

Description

technical field [0001] The invention relates to the technical field of fabrics, in particular to a two-dimensional covalent organic framework modified flexible fiber fabric and a preparation method thereof. Background technique [0002] Self-lubricating spherical plain bearing is a kind of spherical sliding bearing, which is composed of the inner and outer rings of the bearing and the self-lubricating liner material pasted on the inner spherical surface of the outer ring. , among which, the self-lubricating liner materials generally include three types of metal-backed layered composite materials, polymers and their filled composite materials, and PTFE composite fiber fabrics. The self-lubricating liner materials of PTFE composite fiber fabrics have the advantages of Unique technical advantages and huge application prospects. [0003] Polytetrafluoroethylene (PTFE) composite fiber fabric self-lubricating gasket material is essentially a fiber fabric-reinforced polymer-based ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D06M15/53D06M15/423C08G12/42D06M101/22D06M101/36
CPCC08G12/425D06M15/423D06M15/53D06M2101/22D06M2101/36D06M2200/40
Inventor 陶立明郭丽和王廷梅王齐华
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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