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Polybenzoxazole porous oil-containing retainer material for bearing and preparation method thereof

A technology of polybenzoxazole and cage, applied to bearings, bearing components, shafts and bearings, etc., can solve the problems of fast oil output rate and reduced oil supply life of bearing cages

Active Publication Date: 2020-10-23
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing porous polyimide material is based on the YS-20 material of the Shanghai Synthetic Resin Research Institute. The particle size is about 10-50 μm, and the particles are relatively large. The traditional four-column hydraulic press combined with the preparation process of limit sintering (such as ZL200410010165.3 and ZL201310480892.5), the average pore diameter of the obtained pores is above 1.0 μm, and the average pore size directly determines the capillary action of the through pores and affects the throwing and adsorption of the implicit lubricating oil. Therefore, The existing porous polyimide cage made of YS-20 can throw out the lubricating oil at a speed of 3000rpm, and when the bearing speed is further increased, the oil output rate is too fast, causing the lubricating oil to be released in a short period of time. Throwing out from the inside of the cage reduces the oil supply life of the bearing cage and is not suitable for high-speed bearings

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  • Polybenzoxazole porous oil-containing retainer material for bearing and preparation method thereof
  • Polybenzoxazole porous oil-containing retainer material for bearing and preparation method thereof

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preparation example Construction

[0042] The invention provides a method for preparing a polybenzoxazole porous oil-containing cage material for bearings, comprising the following steps:

[0043] Under a protective atmosphere, the aromatic dibasic acid anhydride, the aromatic ortho-hydroxyl diamine and the polar aprotic solvent are mixed for a solution polycondensation reaction to obtain a homogeneous solution of the intermediate;

[0044] Mixing the intermediate homogeneous solution with a dehydrating agent and performing imidization reaction to obtain polyimide molding powder containing phenolic hydroxyl side groups;

[0045] The polyimide molding powder containing phenolic hydroxyl side groups is subjected to cold isostatic pressing to obtain a cold-pressed blank;

[0046] performing controllable hot isostatic pressing on the cold-pressed blank to obtain a porous polybenzoxazole material;

[0047] The porous polybenzoxazole material is subjected to oil immersion treatment to obtain the polybenzoxazole poro...

Embodiment 1

[0082] A, under normal temperature and normal pressure, in a nitrogen protective atmosphere, in a 5L three-necked flask equipped with mechanical stirring, thermometer and condenser, add 183.13g (0.50mol) 6FAP and 1500g N-methylpyrrolidone (NMP), Stir for 0.5 hour to completely dissolve 6FAP to obtain 6FAP solution, slowly add 109.06g (0.50mol) PMDA powder in 4 batches, add 25% of the total mass each time, add 253g solvent NMP after the powder is added, so that the NMP in the reaction system The quality of the two monomers is 6 times that of the two monomers (i.e., the mass concentration is 14.29wt%), and the reaction is stirred at room temperature for 12 hours to obtain 2145.19 g of the intermediate homogeneous solution; then 614 g of toluene is added to the intermediate homogeneous solution, The amount of toluene used is 30% of the mass of the homogeneous solution of the intermediate, and the temperature is raised to 160° C., and the imidization reaction is carried out for 12 ...

Embodiment 2

[0087] A. Under normal temperature and pressure, in a nitrogen protective atmosphere, add 183.13g (0.50mol) 6FAP and 1500gDMAc into a 5L three-necked flask equipped with mechanical stirring, a thermometer and a condenser, and stir for 0.5 hours to completely dissolve 6FAP Obtain 6FAP solution, slowly add 155.11g (0.50mol) ODPA powder in 5 batches, add 20% of the total mass of powder each time, add 191g solvent DMAc after powder is added, make the quality of DMAc in the reaction system be two monomers 5 times of the mass (that is, the mass concentration is 16.67wt%), stirred and reacted at room temperature for 18 hours to obtain 2029.24 g of the intermediate homogeneous solution; then 406 g of benzene was added to the intermediate homogeneous solution, and the consumption of benzene was 20% of the mass of the bulk homogeneous solution, the temperature is raised to 160°C, and the imidization reaction is carried out by using the azeotropy of benzene and water for 24 hours. After t...

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Abstract

The invention provides a polybenzoxazole porous oil-containing retainer material for a bearing and a preparation method thereof, and belongs to the field of organic material preparation. In the present invention, aromatic dicarboxylic anhydride has an anhydride functional group, the ortho-position of an amino group in aromatic o-hydroxy diamine contains a phenolic hydroxyl group; the phenolic hydroxyl group is stable in property at a relatively low temperature (300 DEG C or below), but at a high temperature (350 DEG C or above), a thermal rearrangement reaction can be carried out on the phenolic hydroxyl group and a nearby imide ring to remove CO2 molecules and convert into benzoxazole fragments, and therefore, the strength and the temperature-resistant grade of the polybenzoxazole porousoil-containing retainer material for the bearing are improved; two mechanisms of 'rigid stacking' physical stacking pore forming and 'in-situ CO2 gas molecule removal' gas phase nucleation pore forming are comprehensively utilized, the pore performance of the porous material is regulated and optimized, and the pore size range and the pore size distribution width of the polybenzoxazole porous oil-containing retainer material for the bearing are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of organic material preparation, in particular to a polybenzoxazole porous oil-containing cage material for bearings and a preparation method thereof. Background technique [0002] The physical and chemical properties and lubricating properties of porous polymer bearing cage materials directly determine the bearing accuracy and service life. With the development of long-life high-precision bearings, polymer porous oil-containing materials are also developing towards high temperature, high load, and high performance. [0003] The porous polyimide bearing cage has a through-hole structure, which can not only isolate the rolling elements from each other, but also use its internal pore structure to contain lubricating oil to realize the storage and supply of lubricating oil. When the bearing runs at high speed, the lubricating oil adsorbed in the pores is thrown out under the action of centrifugal force to part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/22C08G73/10C08J9/40C08J9/00F16C33/44F16C33/56C08L79/04C08L79/08
CPCC08G73/1039C08G73/1067C08G73/1071C08G73/22C08J9/00C08J9/40C08J2379/04C08J2379/08F16C33/44F16C33/56F16C2208/40
Inventor 陶立明郭丽和王超杨丽君王廷梅王齐华
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI