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Novel PTFE (polytetrafluoroethylene)-base composite material and preparation method thereof

A technology of PTFE and composite materials, applied in the field of new PTFE-based composite materials and their preparation, can solve the problems of unfavorable vibration reduction and compression resistance, less than ideal, poor resistance, etc., achieve good vibration isolation and sound absorption ability, and low manufacturing cost , the effect of low cost

Active Publication Date: 2016-12-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, epoxy resin is used as the matrix to prepare such resin-based composite materials. However, this kind of material has poor resistance to long-term acid and alkali corrosion, which is not ideal.
[0003] As a matrix, PTFE has excellent chemical corrosion resistance; the applicable temperature range is wide, and its material properties will not be affected between -200 and 260 °C; it has excellent electrical insulation properties and is not affected by frequency, temperature and environment. impact; however, its stiffness is relatively poor, and a single PTFE material is not conducive to making vibration-absorbing and compressive-resistant machine tool foundations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: prepare a kind of novel PTFE-based composite material, the steps are as follows:

[0025] Step 1. Obtaining high-purity quartz sand components: weighing high-purity quartz sand with a particle size range of 0.9 to 1.6 mm and high-purity quartz sand with a particle size range of 3.2 to 4.0 mm according to the secondary discontinuous gradation ratio, Among them, the high-purity quartz sand with a particle size range of 0.9-1.6mm accounts for 43.51wt%. After stirring and mixing, it is ultrasonically cleaned for 5 minutes, dried in an electric constant temperature drying oven for 2 hours, and set aside;

[0026] Step 2, modifying the hollow glass microspheres and high-purity quartz sand respectively, so that the hollow glass microspheres and high-purity quartz sand can be better combined with polytetrafluoroethylene;

[0027] (1) modify the hollow glass microspheres, first measure the silane coupling agent KH-550 whose mass fraction is 3wt% of the hollow glass...

Embodiment 2

[0032] Embodiment 2: prepare a kind of novel PTFE-based composite material, and the preparation step of embodiment 1 is basically the same, and difference is only: the weight percent of the raw material that weighs in step 3 stirring and mixing is different, namely: weigh 21.6g average grain Diameter is the PTFE powder of 30 μm and 7.5g through step two modified high-purity quartz sand (that is, the mass fraction of this component is changed from 35% to 25%) and 0.9g through step two modified hollow glass microspheres (mass fraction is 3%), mechanically stirred for 1 h to obtain a homogeneous mixture.

Embodiment 3

[0033] Embodiment 3: prepare a kind of novel PTFE-based composite material, and the preparation step of embodiment 1 is basically the same, and difference is only: the weight percent of the raw material that is weighed in step 3 stirring and mixing is different, namely: take by weighing 15.6g average grain Diameter is the PTFE powder of 30 μm and 13.5g through step two modified high-purity quartz sand (that is, the mass fraction of this component is changed from 35% to 45%) and 0.9g through step two modified hollow glass microspheres (mass fraction is 3%), mechanically stirred for 1 h to obtain a homogeneous mixture.

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Abstract

The invention discloses a novel PTFE (polytetrafluoroethylene)-base composite material which is prepared from 25-55 wt% of high-purity quartz sand, 1-5 wt% of hollow glass microspheres and the balance of PTFE. The high-purity quartz sand is prepared according to a two-stage discontinuous grading scheme from 43.51 wt% of high-purity quartz sand with the particle size range of 0.9-1.6mm and the balance of high-purity quartz sand with the particle size range of 3.2-4.0mm; and the PTFE is PTFE powder with the average particle size of 30 mu m. The preparation process comprises the following steps: carrying out modification treatment on the high-purity quartz sand and hollow glass microspheres by using a coupling agent, proportionally mixing the raw materials uniformly, spreading the mixture into a mold, and carrying out cold-press molding to obtain a prefabricated part; and sintering the prefabricated part in a muffle furnace. The finally obtained PTFE-base composite material has the characteristic of corrosion resistance in PTFE, and also has the advantages of high rigidity and excellent damping and noise reduction properties.

Description

technical field [0001] The invention relates to a novel PTFE-based composite material and a preparation method thereof, in particular to a PTFE-based composite material with high rigidity, corrosion resistance and excellent vibration and noise reduction performance and a preparation method thereof. Background technique [0002] Resin-based composite materials use resin as the matrix and are made by mixing resin, aggregate and fillers in a certain proportion, and have good vibration-absorbing properties. At present, epoxy resin is used as the matrix to prepare such resin-based composite materials. However, this kind of material has poor resistance to acid and alkali corrosion for a long time, which is not ideal. [0003] As a matrix, PTFE has excellent chemical corrosion resistance; the applicable temperature range is wide, and its material properties will not be affected between -200 and 260 °C; it has excellent electrical insulation properties and is not affected by frequen...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K9/06C08K3/36C08K7/28B29C43/00B29C43/58
CPCB29C43/006B29C43/58B29C2043/5808B29C2043/5816C08K3/36C08K7/28C08K9/06C08K2201/003C08K2201/014C08L27/18
Inventor 林彬胡泽华
Owner TIANJIN UNIV
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