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MoS2-PMMA (polymethyl methacrylate) nanocomposite

A nanocomposite material, mos2-pmma technology, applied in nanotechnology, molybdenum sulfide, etc., can solve problems such as limited wear resistance

Inactive Publication Date: 2018-06-01
刘芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as polyethylene is concerned, even if ultra-high-density raw materials and hot-pressing technology are used to improve its wear resistance, the service life is only about 3 months when the paper handling speed is below 400m·min.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0012] MoS 2 - The raw materials for the preparation of PMMA nanocomposites include: Synthetic nano-MoS 2 Reagents used: sodium molybdate (A.R) (Shanghai Colloidal Chemical Factory). Hydroxylamine hydrochloride (A.R), thiourea (A.R) (Tianjin Standard Technology Co., Ltd.). Absolute ethanol (A.R) (Sinopharm Chemical Reagent Co., Ltd.). Nano-MoS 2 Reagents for surface modification: A. R-grade cetyltrimethylammonium bromide (cTAB). A. R-grade sodium dodecyl sulfonate (SDS) (Shanghai Zhenxing Chemical Plant No. 1). Polymer-based raw materials for the preparation of composite materials: plexiglass PMMA (commercial grade) (Shanghai Chemical Plant No. 1). Auxiliary solvent: ethyl acetate (A.R) (Sinopharm Chemical Reagent Co., Ltd.). MoS 2 -The preparation steps of the PMMA nanocomposite material are: dissolving 4mmol of sodium molybdate in 60mL of ethanol-water solution with a volume ratio of 1:1, adding 8mmol of hydroxylamine hydrochloride, and stirring evenly. Then add 8m...

Embodiment example 2

[0014] Native MoS 2 The average particle size is about 200-300nm, and the BET surface area is about 18.2 m 2 / g, and self-assembled into a nano-flower-like structure from dozens to hundreds of nanosheets (petals) with a thickness of about 10nm, the calcined modified MoS 2 The nanoflower structure has little effect. SDS and CTAB modified MoS 2 Then it presents a thin sheet or laminated structure, which shows that the intervention of organic groups will make MoS 2 The petal structure decomposes into sheets and forms single sheets or laminates under its modified coating, which also indicates that this aggregated MoS 2 Particles can play MoS better 2 Its own layered structure is conducive to the formation of self-lubricating and anti-friction mechanism in the shear sliding state.

Embodiment example 3

[0016] The observation of the tensile section at room temperature shows that the original smooth and flat brittle section of PMMA is compounded with primary MoS and SDS-MoS: the degree of plastic deformation of the matrix PMMA after the particles is intensified, and it has evolved into a three-dimensional cabbage flower-like ductile section with rich layers. The mechanism change is mainly related to the fact that MoS: particles act as stress concentration points when subjected to tensile force. In addition, the clearer MoS 2 The particle shape shows that its compatibility with the matrix and the phase boundary combination are weak, but SDS-MoS 2 The dispersion and compatibility of the particles in the matrix have been improved, which causes the directional tensile yield of the lamellar PMMA matrix, the ductile fracture of the curl and necking, or the core-shaped tensile structure to be more significant. With the MoS 2 When the amount of addition increases, they gradually appe...

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Abstract

The invention discloses a MoS2-PMMA (polymethyl methacrylate) nanocomposite. The MoS2-PMMA nanocomposite is prepared by the aid of ultrasonic dispersion and solution thermal casting technologies withnano MoS2 prepared with liquid phase solvothermal synthesis and surface modification technologies as an antifriction agent and PMMA with poor wear resistance as a polymer matrix. MoS2 nanoparticles are introduced into the polymer matrix PMMA, the decrease amplitude of the friction coefficient of PMMA reaches 50% or above, and the decrease amplitude increases with increase of the addition amount ofMoS2. MoS2 subjected to surface modification with CTAB (cetyl trimethyl ammonium bromide) has the best antifriction effect on PMMA, and the friction coefficient of PMMA can be decreased by 73% after5% by mass of MoS2 is added.

Description

technical field [0001] The invention relates to a composite thin film material, in particular to a MoS 2 - PMMA nanocomposites. Background technique [0002] Material wear is caused by the relative frictional motion between its surface and the contacting object, and the material quality is gradually lost or even destroyed. Polymers (such as polyphenylene sulfide, polypropylene, polyethylene and plexiglass, etc.) are cost-effective as friction structural materials or contact transmission functional parts, but the friction and wear are serious when used. Taking the dewatering element of the fourdrinier paper machine as an example, the materials of the forming board, dewatering board, dewatering box and water suction box are continuously updated from natural wood, rubber, polyethylene to ceramics in order to continuously improve the performance of the dehydrating element. Abrasion resistance, service life and cost performance in high speed scour and friction operating environ...

Claims

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Application Information

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IPC IPC(8): C08K9/04C08K3/30C08L33/12C01G39/06B82Y40/00
CPCC08K9/04C01G39/06C01P2002/70C01P2004/03C01P2004/30C01P2004/62C01P2006/12C08K3/30C08L33/12
Inventor 刘芳
Owner 刘芳
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