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Nanometer TiO2-modified polytrifluoroethylene and preparation method thereof

A technology of polytrifluoroethylene and nanometers, which is applied in the field of composite materials, can solve the problems of large molding shrinkage, large linear expansion coefficient, and poor wear resistance, and achieve good elasticity, improve wear resistance, and reduce the friction coefficient.

Inactive Publication Date: 2017-05-10
NANJING COMPTECH COMPOSITES CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with other thermoplastic materials, it has disadvantages such as poor mechanical properties, large linear expansion coefficient, large molding shrinkage, and poor wear resistance, which limits its application to a certain extent.
TiO2 and polytrifluoroethylene have their own advantages, but combining the two, materials that have the advantages of both have not yet been found

Method used

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  • Nanometer TiO2-modified polytrifluoroethylene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Nano TiO 2 The preparation method of modified polytrifluoroethylene, its step comprises:

[0019] A. Primary vacuum drying: use a vacuum drying oven to vacuum dry the polytrifluoroethylene powder, the vacuum drying temperature is 120 ° C, and the time is 2 hours;

[0020] B. High-speed mixing: Use a high-speed mixer to mix polytrifluoroethylene powder and TiO 2 The powder is mixed so that the polytrifluoroethylene powder and TiO 2 The powder is evenly blended, and the speed of mixing is selected to be 1450r / min, and the mixture is uniform, and the added nano-TiO 2 The mass percentage of polytrifluoroethylene is: 2%;

[0021] C. Extrusion granulation: Use a twin-screw compounding extruder to process the polytrifluoroethylene powder and TiO after the high-speed mixing step 2 The powder mixture is extruded and granulated to form extrusion ingredients, and then the extrusion ingredients are placed in normal temperature water to cool to normal temperature, and then the c...

Embodiment 2

[0025] Nano TiO 2 The preparation method of modified polytrifluoroethylene, its steps are basically the same as in Example 1, the difference is that the nano-TiO added in step B 2 The mass percentage of polytrifluoroethylene is 6%. Nano-TiO 2 The test results of modified polytrifluoroethylene are shown in Table 1.

Embodiment 3

[0027] Nano TiO 2 The preparation method of modified polytrifluoroethylene, its steps are basically the same as in Example 1, the difference is that the nano-TiO added in step B 2 The mass percentage of polytrifluoroethylene is 10%. Nano-TiO 2 The test results of modified polytrifluoroethylene are shown in Table 1.

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Abstract

The invention discloses a nanometer TiO2-modified polytrifluoroethylene composite material, which is characterized by being formed by the binary combination of nanometer TiO2 and polytrifluoroethylene, and the percentage by mass of the nanometer TiO2 and the polytrifluoroethylene is 1 percent to 10 percent. The invention also discloses a preparation method for the nanometer TiO2-modified polytrifluoroethylene, which includes the following steps: (A) primary vacuum drying; (B) high-speed mixing; (C) extrusion and pelletization; (D) secondary vacuum drying; (E) injection molding. Since the invention adopts the nanometer TiO2 as modification filling for the polytrifluoroethylene, under the premise of not changing the original process, the prepared nanometer TiO2-modified polytrifluoroethylene has good elasticity, cannot be easily broken, and can resist stretching and bending, the strength is higher, the friction coefficient of resin surface is decreased, and the abrasive resistance is enhanced.

Description

technical field [0001] The present invention relates to nanometer TiO 2 Modified polytrifluoroethylene and a preparation method thereof belong to the field of composite materials. Background technique [0002] Polytrifluoroethylene is a crystalline polymer with a melting point of 425F and a density of 2.13g / cc (grams per cubic centimeter). It is inert to most active chemicals at room temperature, and can be dissolved by a few solvents above 212T. It has the characteristics of high temperature resistance and low temperature resistance, non-flammable, good toughness, and is widely used in sealing materials and filling materials. . However, compared with other thermoplastic materials, it has disadvantages such as poor mechanical properties, large linear expansion coefficient, large molding shrinkage rate, and poor wear resistance, which limit its application to a certain extent. TiO2 and polytrifluoroethylene have their own advantages, but a material that combines the two an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12C08K3/22B29B9/06B29B13/06B29C45/77B29C45/78
CPCC08K3/22B29B9/06B29B13/065B29C45/77B29C45/78C08K2003/2241C08K2201/011
Inventor 杨文光支永潮陈佩民靳予孙克原
Owner NANJING COMPTECH COMPOSITES CORP