Negative-pressure-resistant fluoroplastic product and preparation method thereof
A technology of fluoroplastics and negative pressure resistance, which is applied in the field of negative pressure fluoroplastic products and its preparation, which can solve the problems of easy negative pressure shrinkage and negative pressure resistance performance requirements that cannot be met at the same time, and reduce the performance of thermal expansion and cold contraction of fluoroplastic products and other problems to achieve the effect of strong negative pressure resistance
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[0061] In some embodiments of the present invention, the preparation method of the fluoroplastic film comprises the following steps: placing the polytetrafluoroethylene resin powder in a cylindrical groove mould, pressing to form a green block, sintering into a block, and turning into a block after cooling. Fluoroplastic film. The thickness of the fluoroplastic film formed by turning can be 0.01-0.5mm.
[0062] In some embodiments of the present invention, the second fluoroplastic layer 5 is externally provided with an adhesive layer 6, and the adhesive layer 6 is composed of an inner layer formed of a fusible fluoroplastic and a composite sintered outer layer formed by winding glass fibers. Forming. Therefore, in the preparation process, after forming the second fluoroplastic layer 5, a certain thickness of fusible fluoroplastic film tape should be wound outside the second fluoroplastic layer 5, then wrapped with a layer of glass fiber tape, and then wrapped on the glass fib...
Embodiment 1
[0065] A round tubular negative pressure resistant fluoroplastic product, the preparation process of which is as follows:
[0066] Step 1: Wrap a polytetrafluoroethylene film tape with a thickness of 0.1mm around the outside of the stainless steel cylindrical mold to form a third fluoroplastic layer 1 with a thickness of 3.0mm;
[0067] Step 2: spirally wrap the steel wire around the third fluoroplastic layer 1 to form metal ribs 2;
[0068] Step 3: Wrap a polytetrafluoroethylene film tape with a thickness of 0.1 mm around the metal rib 2 to form a first fluoroplastic layer 3 with a thickness of 2.0 mm;
[0069] Step 4: Tightly bind the first fluoroplastic layer 3 with multiple layers of interlaced glass fiber tapes to a certain thickness to form a glass fiber auxiliary layer;
[0070] Step 5: Put it in a sintering furnace, raise the temperature to 380°C for sintering, then cool and demould, remove the glass fiber auxiliary layer, and obtain a circular tubular negative pressu...
Embodiment 2
[0073] A round tubular negative pressure resistant fluoroplastic product, the preparation process of which is as follows:
[0074] Step 1: Wrap a polytetrafluoroethylene film tape with a thickness of 0.1mm around the outside of the stainless steel cylindrical mold to form a third fluoroplastic layer 1 with a thickness of 3.0mm;
[0075] Step 2: spirally wrap the steel wire around the third fluoroplastic layer 1 to form metal ribs 2;
[0076] Step 3: Wrap a polytetrafluoroethylene film tape with a thickness of 0.1 mm back and forth outside the metal rib 2 to form a first fluoroplastic layer 3 with a thickness of 0.5 mm;
[0077] Step 4: Shorten the stretchable metal mesh sleeve 4 in the axial direction so that its diameter is slightly larger than the outer diameter of the first fluoroplastic layer 3, so that it can be conveniently placed on the outside, and then the two ends of the metal mesh sleeve 4 in the axial direction are Stretch outward, and the diameter becomes smaller...
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Abstract
Description
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