Modified polyformaldehyde material for flange bearing
A polyoxymethylene material and polyoxymethylene technology, which is applied in the field of new materials, can solve the problems of decreasing surface hardness, increasing friction coefficient, and it is difficult to meet the flanging of flanged bearings without cracking, etc., and achieve the effect of good bearing capacity and wear resistance.
Inactive Publication Date: 2011-01-05
SHANGHAI RES INST OF MATERIALS CO LTD
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AI Technical Summary
Problems solved by technology
[0004] Flanged bearing is one of the application products of three-layer composite self-lubricating material. It is different from ordinary composite bearings. In addition to being rolled into a cylindrical shape, one end must be turned 90 degrees at the end. Conventional modified polyoxymethylene is used in Under such working conditions, cracking will occur at the bending and flanging, and the use of toughened polyoxymethylene purchased in the market can solve the cracking problem, but ordinary toughened polyoxymethylene is added with rubber or elastomer components, which increases toughness but resists compression at the same time The performance declines and the friction coefficient increases, which cannot meet the needs of the bearing industry
[0005] Regarding the modification of polyoxymethylene, many documents and patents have reports, patent (application) No. 200710077042.5, 200610147544.6, 200610022223.3, 200410040158.8, 02128048.7 have reported the method of polyoxymethylene toughening modification, but all are by adding rubber or elastomer components To modify, the toughness increases but at the same time the compressive performance decreases, the surface hardness decreases, and the coefficient of friction increases, which cannot meet the needs of the bearing industry
National patent (application) Nos. 00106171.2, 99123812.5, 03151026.4, 200510126587.1, 200610022223.3, 200910241374.1 and other patents have announced some methods for improving the friction and wear properties of polyoxymethylene, but they are all based on the modification of the polyoxymethylene material itself, without considering its three-layer The application of composite self-lubricating materials, the addition of its main modifiers grease, ultra-high molecular weight polyethylene, etc., will affect the bonding strength of modified polyoxymethylene with steel plate and copper powder layer, and it is difficult to meet the requirements of flanging bearing flanging without cracking requirements
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0028] 8.8 kg of pre-dried polyoxymethylene, 0.5 kg of attapulgite powder, 0.5 kg of thermoplastic polyurethane elastomer (TPU), 0.2 kg of molybdenum disulfide, 300 mesh of attapulgite powder, and the above raw materials are mixed in a plastic mixer for 1 Minutes, discharge. The mixed materials were blended and granulated in a twin-screw extruder, and the temperature of the extruder was set at 160° C. to prepare a modified polyoxymethylene material for flanging bearings.
Embodiment 2
[0030] 6.2 kg of pre-dried polyoxymethylene, attapulgite powder 0.8 kg, thermoplastic polyurethane elastomer (TPU) 1.0 kg, polytetrafluoroethylene 0.8 kg, attapulgite powder is 400 mesh, the above raw materials in the plastic mixer Mix for 1 minute and discharge. The mixed materials were blended and granulated in a twin-screw extruder, and the temperature of the extruder was set at 170° C. to obtain a modified polyoxymethylene material for flanging bearings.
Embodiment 3
[0032] 8.0 kg of pre-dried polyoxymethylene, 1.0 kg of attapulgite powder, 0.6 kg of thermoplastic polyurethane elastomer (TPU), 0.2 kg of molybdenum disulfide, 0.2 kg of graphite, and attapulgite powder of 400 mesh. Mix in the feeder for 2 minutes and discharge. The mixed material was blended and granulated in a twin-screw extruder, and the temperature of the extruder was set at 185°C to prepare a modified polyoxymethylene material for flanging bearings. The performance test is shown in Table 1.
[0033] Table 1
[0034] project
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Abstract
The invention relates to a modified polyformaldehyde material for a flange bearing, raw materials comprise the following components in parts by weight: 62-88 parts of polyformaldehyde, 5-10 parts of attapulgite powder, 5-10 parts of thermoplastic polyurethane elastomer and 2-8 parts of lubricant, and the raw materials are placed in a plastic mixer for mixing and then placed in a twin-screw extruder for carrying out mixing and granulation, thereby obtaining the modified polyformaldehyde material for the flange bearing. Compared with the prior art, the modified polyformaldehyde material adopts the polyformaldehyde, the thermoplastic polyurethane elastomer, the solid lubricant and the attapulgite powder to constitute a compound modification system, thereby obtaining excellent synergy by compounding, meeting the requirement that a flange of the flange bearing has no cracks, having the abrasion resistance and the compression bearing capacity required for the bearing, and meeting the requirements on no cracks, good bearing capacity and abrasion resistance of the three-layer compound bearing flanging process.
Description
technical field [0001] The invention belongs to the field of new materials, in particular to a modified polyoxymethylene material for flanged bearings. Background technique [0002] Polyoxymethylene (POM) has the molecular formula -[CH 2 O] n -, because its molecular chain has a smooth profile, so it has good self-lubricating property and low friction coefficient. And because it is a linear high-crystalline polymer with flexible chains, high crystallinity and large bond energy, it is not easy to transfer to the opposite grinding surface, and it has inherent good wear resistance and high strength. It is a resin whose specific strength is closer to that of metal among all plastics. One of the varieties, it is widely used in the manufacture of various parts in the fields of machinery, automobiles, electronic appliances, etc. [0003] In the technical field, the modified polyoxymethylene material is applied to a three-layer composite self-lubricating flange bearing. The thre...
Claims
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IPC IPC(8): C08L59/02C08L59/04C08L75/04C08K3/34
Inventor 李小慧金石磊
Owner SHANGHAI RES INST OF MATERIALS CO LTD