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Ptfe composite material and its preparation method

A technology of composite materials and raw materials, applied in the field of composite materials, can solve the problems of poor mechanical properties of polytetrafluoroethylene, achieve excellent mechanical properties, improve mechanical properties, and improve radial stiffness

Inactive Publication Date: 2020-12-01
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the poor mechanical properties of PTFE limit its practical application to some extent.

Method used

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  • Ptfe composite material and its preparation method
  • Ptfe composite material and its preparation method
  • Ptfe composite material and its preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0039] A kind of preparation method of above-mentioned PTFE composite material, comprises the steps:

[0040] S10, mixing the PTFE powder and the filler powder to obtain a composite material powder, making the composite material powder wrap the continuous fiber to obtain a fiber powder tape.

[0041] S20, winding the fiber powder tape to form a fiber powder tape cylinder.

[0042] S30, sintering the fiber powder with the cylinder to obtain the above-mentioned PTFE composite material.

[0043] Preferably, before the sintering process, the metal cladding plate with the release material on the inner wall is wrapped on the surface of the fiber powder belt cylinder, so as to provide support and protection for the PTFE composite material during the sintering process and avoid deformation or damage.

[0044] Preferably, the release material is graphite powder or PTFE glass fiber cloth, which has the characteristics of high temperature resistance, wear resistance, chemical resistance...

Embodiment 1-19

[0052] Prepare PTFE composite according to the component ratio in Table 1 according to the following steps:

[0053] Put PTFE powder and Al metal powder into a mixer and mix them well to obtain composite material powder. In Examples 1-11 and Example 14, the continuous fibers are dispersed by tools or by hand to make them fluffy. In Example 14, the specific use The untwisting machine disperses the continuous fibers. The composite material powder is mixed with the continuous fiber, so that the composite material powder wraps the continuous fiber and then is gathered to obtain a powder belt.

[0054] Cover the release material on the surface of the winding roller, adjust the pressing roller to closely contact the winding roller, then feed the fiber powder tape from one end surface between the two rollers, turn the winding roller, and the pressing roller will press the fiber powder tape on the winding roller, The fiber powder belt is hoop-wound without gaps until it reaches the o...

Embodiment 20

[0060] The mass percentages of PTFE powder, Al powder, and PBO fiber were 68.9%, 24.8%, and 6.3%, respectively. The PTFE composite material was prepared according to the steps of Example 1, except that only hoop winding was performed. The prepared PTFE composite material has a height of 155 mm, an inner diameter of 155 mm, and a barrel mass of 316 g. The thickness of the barrel at different measurement positions is shown in Table 2. The thickness of the barrel at about 10 mm from the edge is measured every 60°. Both sides of the cylinder are measured, the average thickness of one end is 2.05mm, and the average thickness of the other end is 2.08mm. Slice samples were taken for tensile strength test, the tensile strength in the fiber direction (hoop direction) was 53.6 MPa, and the tensile strength in the fiber vertical direction (axial direction) was 6.56 MPa.

[0061] Table 2

[0062] Measurement orientation (°) One end thickness(mm) Thickness of the other end (...

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Abstract

The invention relates to a PTFE composite material, and a preparation method thereof. The PTFE composite material is prepared from, by mass, 2 to 30% of continuous fiber, 30 to 98% of PTFE powder, and 0 to 50% of a filling material powder. According to the preparation method, the PTFE composite material is obtained via modification of polytetrafluoroethylene with a certain ratio of continuous fiber and the filling material powder, the continuous fiber is taken as a skeleton, internal stress concentration points are reduced, when the PTFE composite material is loaded with external load, the load is transferred onto the continuous fiber, the continuous fiber is used for load-bearing, the mechanical properties of the PTFE composite material are improved effectively, and the tensile strength is capable of reaching 272.4MPa. The PTFE composite material with a large size thin wall cylindrical body shape is provided with excellent mechanical properties, and annular reinforcing ribs are arranged on the cylindrical PTFE composite material so as to improve the radial stiffness of the PTFE composite material further.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a PTFE composite material and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) is a synthetic polymer material that uses fluorine to replace all hydrogen atoms in polyethylene. This material has the characteristics of acid and alkali resistance and various organic solvent resistance, and is almost insoluble in all solvent. With the development of science and technology, the application of polytetrafluoroethylene in engineering has grown rapidly, and has become one of the indispensable materials for cutting-edge science and modern industry. It is used in atomic energy, national defense, aerospace, electronics, electrical, chemical, It is widely used as high and low temperature resistant, corrosion resistant materials, insulating materials, etc. in industries such as machinery, instruments, meters, construction, textiles, metal surface t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08L77/06C08L79/04C08K3/08C08K7/14C08K7/06C08K3/04C08K7/10
CPCC08K3/04C08K3/08C08K7/06C08K7/10C08K7/14C08K2003/0812C08L27/18C08L77/06C08L79/04
Inventor 阳世清
Owner NAT UNIV OF DEFENSE TECH
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