Polymer filling modified material and forming process thereof
A modified material and molding process technology, which is applied in the field of polymer materials, polymer filled modified materials and their molding technology, can solve the problems of polytetrafluoroethylene creep resistance, wear resistance and poor resilience, etc. Achieve performance enhancement, high crystallinity, and large relative molecular mass
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Embodiment 1
[0026] The invention provides a polymer filled modified material, the modified material includes the following raw materials in weight percentage:
[0027] PTFE 50-75%
[0028] Polyimide 10-25%
[0029] Polyphenylene 5-20%
[0030] Among them, polytetrafluoroethylene is suspended polytetrafluoroethylene resin, the particle size of polytetrafluoroethylene fine resin is 15μm-50μm, the number average molecular weight of polytetrafluoroethylene is 8-12 million; the particle size of polyimide is 300 -500 mesh; the particle size of polyphenylene is 300-500 mesh.
[0031] The invention uses polyimide and polyphenylene as filling materials to change the performance of polytetrachlorethylene. Polytetrachloroethylene has the characteristics of high crystallinity, large relative molecular mass, and no branched chain molecules. Due to the small attraction between polytetrachloroethylene molecules, it is easy to cause slippage between molecules after being subjected to shear stress, res...
Embodiment 2
[0045] The molding process of the polymer filled modified material includes the following molding steps:
[0046] Step 1: Weigh polytetrafluoroethylene, polyimide and polyphenylene according to the weight ratio, and then add them to the high-speed mixer in turn for thorough mixing;
[0047] Step 2: Put the mixed raw materials into the mold and press them into shape;
[0048] Step 3: Put the formed raw materials into the sintering furnace for sintering;
[0049] Step 4: Machining the sintered semi-finished product to obtain a finished seal.
[0050] In step 1, the mixing speed of the high-speed mixer is 1000 r / min, the mixing temperature is 22° C., the mixing times are 3 times, and the mixing time is 10 minutes each time.
[0051] In step 2, the compression force used for the compression molding is 20 MPa, and the compression time is 5 minutes.
[0052] In Step 3, the sintering temperature is 320° C., the heating rate is 5° C. / min, and the heating time is 60 minutes. After h...
Embodiment 3
[0055] The molding process of the polymer filled modified material includes the following molding steps:
[0056]Step 1: Weigh polytetrafluoroethylene, polyimide and polyphenylene according to the weight ratio, and then add them to the high-speed mixer in turn for thorough mixing;
[0057] Step 2: Put the mixed raw materials into the mold and press them into shape;
[0058] Step 3: Put the formed raw materials into the sintering furnace for sintering;
[0059] Step 4: Machining the sintered semi-finished product to obtain a finished seal.
[0060] In step 1, the mixing speed of the high-speed mixer is 1800r / min, the mixing temperature is 32°C, the mixing frequency is 5 times, and the mixing time is 20 minutes each time.
[0061] In step 2, the compression force used for the compression molding is 60 MPa, and the compression time is 15 minutes.
[0062] In step 3, the sintering temperature is 380° C., the heating rate is 5° C. / min, and the heating time is 120 minutes. After ...
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Abstract
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