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Modified polyformaldehyde material for three-layer composite material

A polyoxymethylene material and composite material technology, which is applied in the field of modified polyoxymethylene materials, can solve the problems affecting the bonding strength of modified polyoxymethylene and steel plates, and does not consider the application of three-layer composite self-lubricating materials, and achieves excellent synergistic effect, low Friction coefficient, effect of reducing deformation

Active Publication Date: 2012-09-19
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

National patent (application) Nos. 00106171.2, 99123812.5, 03151026.4, 200510126587.1, 200610022223.3 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 composite The application of 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 9.3 kg of polyoxymethylene, 0.5 kg of flaky zinc powder, and 0.2 kg of molybdenum disulfide in a plastic mixer for 1 minute before discharging. 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 a three-layer composite material.

Embodiment 2

[0028] 6.4 kg of pre-dried polyoxymethylene, 3.0 kg of flake copper powder, and 0.6 kg of polytetrafluoroethylene were mixed in a plastic mixer for 1 minute and discharged. The mixed material was blended and granulated in a twin-screw extruder, and the temperature of the extruder was set at 170°C to prepare a modified polyoxymethylene material for a three-layer composite material. The performance test is shown in Table 1.

[0029] Table 1

[0030] project

Embodiment 3

[0032] Mix 8.5 kg of pre-dried polyoxymethylene, 0.5 kg of flaky copper powder, 0.5 kg of flaky zinc powder, 0.2 kg of molybdenum disulfide, and 0.3 kg of graphite in a plastic mixer for 2 minutes before discharging. The mixed materials were 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 a three-layer composite material.

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PUM

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Abstract

The invention relates to a modified polyformaldehyde material for a three-layer composite material, which comprises the following components in weight percentage: 64-93% of polyformaldehyde, 5-30% of metal powder and 2-6% of lubricating agent, wherein the metal powder is simplex powder or a mixture of flaky copper powder, copper alloy powder or zinc powder; the lubricating agent comprises simplexpowder or a mixture of polytetrafluoroethylene, molybdenum disulfide or graphite; and the composite material can be prepared by extruding granulation by using the conventional double screw extruder for plastic processing. Compared with the prior art, the bearing made of the three-layer composite materials has the advantages of favorable thermal conduction, carrying capacity, wear resistance and the like.

Description

technical field [0001] The invention belongs to the field of new materials, in particular to a modified polyoxymethylene material used for three-layer composite materials. Background technique [0002] The molecular formula of polyoxymethylene (POM) is -[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] However, when ordinary polyoxymethylene is used as a friction part under the condition of high relative speed and heavy l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L59/02C08L59/04C08L27/18C08K7/00C08K3/08C08K3/04C08K3/30
Inventor 李小慧金石磊杨宝国
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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