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Preparation method of talc filled PTFE composite material

A composite material and talc technology, applied in the field of polytetrafluoroethylene composite material and its preparation, can solve the problems of complex preparation process, large surface wear of abrasive parts, high hardness of ceramic powder, etc., and achieve simple preparation process and strong market competitiveness. , the effect of large filling ratio

Inactive Publication Date: 2012-10-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glass fiber, carbon fiber, graphite, molybdenum disulfide and various ceramic powders are the most commonly used fillers in industry at present, but they all have disadvantages, such as glass fiber is not resistant to alkali and hydrofluoric acid, has poor thermal conductivity, and does not dissolve in water. Wear-resistant, carbon fiber is not resistant to strong oxidants, the preparation process is complicated, graphite is not resistant to oxidants, molybdenum disulfide is not resistant to strong acids, various ceramic powders have high hardness, and wear on the surface of abrasive parts, etc. (Zhang Yongming, Li Hong, Zhang Heng. Fluorine Functional Materials, Beijing: Chemical Industry Press, 2008:60-70), so people still need to continue to look for suitable fillers to prepare PTFE composites with better performance and wider application fields

Method used

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  • Preparation method of talc filled PTFE composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1. A method for preparing a talc-filled PTFE composite material, followed by the following steps:

[0043] 1) Ingredients:

[0044] PTFE (particle size 50 μm), 90%,

[0045] Talc (particle size 5 μm), 10%.

[0046] 2) Put the mixture prepared in step 1) into a mixer and stir evenly at high speed; then cold-press molding (ie, press molding at room temperature) under a pressure of 38 MPa, and the cold-pressing time is 3 minutes.

[0047] 3) Put the molded product obtained in step 2) into a high-temperature sintering furnace, and heat it at a temperature increase rate of 80°C / hour. When the temperature reaches 290°C, keep it for 30 minutes; then continue to heat it to a temperature of 60°C / hour Keep at 370°C for 0.5 hour.

[0048] 4) The sintered product obtained in step 3) is cooled to 290°C at a rate of 60°C / hour and kept for 24 minutes, and then naturally cooled to room temperature to obtain a talc-filled PTFE composite material.

[0049] The talc-filled PTFE composite mat...

Embodiment 2

[0050] Example 2. A method for preparing a talc-filled PTFE composite material, followed by the following steps:

[0051] 1) Ingredients:

[0052] PTFE (particle size 50 μm), 80%,

[0053] Talc (particle size 5 μm), 20%.

[0054] 2) Put the mixture prepared in step 1) into a mixer and stir evenly at high speed; then cold-press molding (ie, press molding at room temperature) under a pressure of 38 MPa, and the cold-pressing time is 3 minutes.

[0055] 3) Put the molded product obtained in step 2) into a high-temperature sintering furnace and heat it at a heating rate of 60°C / hour. When the temperature reaches 290°C, keep it for 30 minutes; then continue to heat it at a heating rate of 30°C / hour to Keep the temperature at 370°C for 1 hour.

[0056] 4). The sintered product obtained in step 3) is cooled to 290°C at a rate of 60°C / hour, kept for 24 minutes, and then naturally cooled to room temperature to obtain a talc-filled PTFE composite material.

[0057] The talc-filled PTFE composite m...

Embodiment 3

[0058] Example 3. A method for preparing a talc-filled PTFE composite material, followed by the following steps:

[0059] 1) Ingredients:

[0060] PTFE (particle size 50 μm), 87%,

[0061] Talc (particle size 10 μm), 10%,

[0062] Nano Al 2 O 3 (60 nm), 3%.

[0063] 2) Put the mixture prepared in step 1) into a mixer and stir evenly at high speed; then cold-press molding (ie, press molding at room temperature) under a pressure of 35 MPa, and the cold-pressing time is 5 minutes.

[0064] 3) Put the molded product obtained in step 2) into a high-temperature sintering furnace and heat it at a heating rate of 60°C / hour. When the temperature reaches 290°C, keep it for 30 minutes; then continue to heat it at a heating rate of 30°C / hour to Keep the temperature at 370°C for 1 hour.

[0065] 4). The sintered product obtained in step 3) was cooled to 292°C at a rate of 60°C / hour and kept for 30 minutes, and then naturally cooled to room temperature to obtain a talc-filled PTFE composite material....

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Abstract

The invention discloses a preparation method of a talc filled PTFE (polytetrafluoroethylene) composite material. The method comprises the following steps in order: 1) conducting burdening with 50-99 wt% of PTFE, 1-50 wt% of talc powder, 0 wt%-10 wt% of filler I, and 0 wt%-20 wt% of filler II; 2) mixing the mixture obtained in step 1) uniformly, then carrying out cold pressing molding under a pressure of 25-40 MPa, and maintaining the pressure for 3-10 minutes; 3) putting the molded product obtained in step 2) into a high temperature sintering furnace, heating the product to a temperature of 360-380DEG C at a heating rate of 30-100DEG C / h, then preserving the heat for 0.5-2h; and 4) leaving the sintered product obtained in step 3) to natural cooling to room temperature, thus obtaining the talc filled PTFE composite material. The talc filled PTFE composite material prepared by the method of the invention has excellent performances and a wide application range.

Description

Technical field [0001] The invention belongs to the field of polymer material modification technology, and specifically relates to a polytetrafluoroethylene composite material and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent chemical stability, aging resistance, radiation resistance, thermal stability, etc., but it also has some shortcomings, such as poor mechanical properties and load carrying capacity, large linear expansion coefficient, and poor thermal conductivity , Poor creep resistance, poor wear resistance, high production cost, etc., these defects limit its application. In order to improve the comprehensive performance of PTFE, people have been working on the modification of PTFE for many years. Filling modification is to add fillers to PTFE. On the basis of maintaining the original advantages of PTFE, the composite effect is used to achieve the purpose of improving the comprehensive performance of PTFE. Glass...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08L61/16C08L81/02C08K3/34C08K3/22C08K13/04C08K7/14C08K3/08C08K3/14C08K7/08B29C69/02B29C67/04B29C43/58
Inventor 汪海风罗仲宽徐意杨辉
Owner ZHEJIANG UNIV
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