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Preparation method for halloysite, ultrafine inorganic powder and PTFE micro-nano composite material

A technology of polytetrafluoroethylene and inorganic powder is applied in the field of preparation of polytetrafluoroethylene micro-nano composite materials, which can solve the problem that creep resistance cannot be effectively improved, elongation at break and tensile strength are decreased, heavy metal pollution, etc. problems, to achieve the effect of improving mechanical properties, excellent friction resistance and creep resistance, and increasing crystallinity

Active Publication Date: 2015-10-21
安徽桑瑞泰粉末材料有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon nanotube (CNT) filled PTFE greatly improves the wear resistance of the composite material and reduces its coefficient of friction, but CNT is expensive
The filling of molybdenum disulfide will improve the wear resistance of PTFE, but the creep resistance cannot be effectively improved
The filling of glass fiber will greatly improve the wear resistance and creep resistance of PTFE, but the elongation at break and tensile strength will be greatly reduced
The addition of copper powder and lead powder will cause heavy metal pollution, etc.

Method used

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  • Preparation method for halloysite, ultrafine inorganic powder and PTFE micro-nano composite material
  • Preparation method for halloysite, ultrafine inorganic powder and PTFE micro-nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix polytetrafluoroethylene with a particle size of 25 μm and glass fiber at a mass ratio of 70:30, and prepare a homogeneous mixture of glass fiber / polytetrafluoroethylene by mechanical blending.

[0025] The prepared powder was cold-pressed under a pressure of 35MPa and kept under pressure for 2 minutes. The resulting flake sample was removed from the mold, placed in a muffle furnace, heated to 370~380°C at a heating rate of 200°C / hour, kept for 2 hours, and then the sintered product was cooled to room temperature with the furnace to obtain modified glass fiber PTFE composite material.

[0026] The glass fiber modified polytetrafluoroethylene composite material is tested according to GB / T 1040-92, and its elongation at break = 268.68%, tensile strength = 15.75MPa. GB / T 3960-1983 test, its wear amount = 0.2mg, friction coefficient = 0.18. At 40-100°C, the coefficient of linear expansion is nearly 2 orders of magnitude lower than that of pure PTFE.

Embodiment 2

[0028] The polytetrafluoroethylene with a particle size of 25 μm and the talc powder with a particle size of 4 μm were mixed at a mass ratio of 95:5, and a homogeneous mixture of talc powder / polytetrafluoroethylene was prepared by mechanical blending.

[0029] The prepared powder was cold-pressed under a pressure of 35MPa and kept under pressure for 2 minutes. The obtained flake sample was removed from the mold, placed in a muffle furnace, heated to 370~380°C at a heating rate of 200°C / hour, kept for 2 hours, and then the sintered product was cooled to room temperature with the furnace to obtain a modified talc powder PTFE composite material.

[0030] The talcum powder filled polytetrafluoroethylene composite material is tested according to GB / T 1040-92, and its elongation at break = 632.53%, tensile strength = 28.05MPa. GB / T 3960-1983 test, its wear amount = 3.5mg, friction coefficient = 0.2. At 40-300°C, the coefficient of linear expansion is nearly an order of magnitude l...

Embodiment 3

[0032] Mix polytetrafluoroethylene with a particle size of 25 μm, glass fiber, and halloysite through a 200-mesh sieve at a mass ratio of 70:28:2, and prepare halloysite / glass fiber / polytetrafluoroethylene by mechanical blending homogeneous mixture.

[0033] The prepared powder was cold-pressed under a pressure of 40 MPa, and kept under pressure for 2 minutes. The resulting flake samples were removed from the mold, placed in a muffle furnace, heated to 370-380°C at a heating rate of 200°C / hour, kept for 2 hours, and then the sintered product was cooled to room temperature with the furnace to obtain halloysite / Glass fiber / polytetrafluoroethylene micro-nano composite material.

[0034] The halloysite / glass fiber / polytetrafluoroethylene micro-nano composite material is tested according to GB / T 1040-92, and its elongation at break = 376.28%, tensile strength = 16.11MPa. GB / T 3960-1983 test, its wear amount = 0.2mg, friction coefficient = 0.18. At 60~220°C, the coefficient of l...

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Abstract

Provided is a preparation method for a halloysite, ultrafine inorganic powder and PTFE micro-nano composite material, and the method relates to the technical field of preparation of PTFE micro-nano composite materials. The method comprises steps of: firstly, preparing a uniform mixing of PTFE and inorganic powder through mechanical high speed blending; then shaping the obtained mixed powder through cold pressing, and performing mold releasing to obtain a sheet-like sample; and finally placing the sample in a muffle furnace, raising the temperature to 370-380 DEG C at a rising rate of 150-200 DEG C / h, keeping the temperature for 2 hours, and then cooling the sample to the room temperature along with the furnace, thereby obtaining a PTFE micro-nano composite material. According to the method provided by the invention, the crystallization behavior of the PTFE is improved through filling with inorganic micro-nano particles; excellent mechanical properties of the PTFE are maintained by regulating interfacial adhesion between the micro-nano particles and the PTFE; meanwhile, the PTFE is endowed with excellent wear resistance and creep resistance.

Description

technical field [0001] The invention relates to the technical field of preparation of polytetrafluoroethylene micro-nano composite materials. Background technique [0002] Polytetrafluoroethylene (PTFE) not only has excellent physical and chemical properties, but also has a very low coefficient of friction and self-lubricating material, making it widely used in chemistry, electronics, bioengineering, food industry and some other related fields. However, PTFE also has poor friction resistance and a large linear expansion coefficient, which limits its application in many demanding occasions. Therefore, many researches at home and abroad focus on the improvement of PTFE mechanics, wear resistance and creep resistance. Among them, the filling modification of PTFE is a widely used modification method. The crystallization behavior of PTFE can be changed by filling the filler, and the high-performance PTFE can be obtained by adjusting the interface bonding performance between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K7/26C08K3/26C08K3/34C08K3/30C08K3/04C08K7/14C08K7/06B29C69/02
CPCB29C69/02C08K3/26C08K3/30C08K7/14C08K7/26C08K2003/265C08K2003/3009C08K2201/003C08K2201/011C08L2205/24C08L27/18
Inventor 朱爱萍江波李艳香程志林
Owner 安徽桑瑞泰粉末材料有限公司
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