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Fluororubber and thermal expansion molding method
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A molding method and technology of fluororubber, which is applied in the field of composite material molding, can solve problems such as easy flow marks, material shortage, and poor fluidity of fluororubber, and achieve the effects of good fluidity, less equipment investment, and low manufacturing cost
Active Publication Date: 2020-06-26
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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Problems solved by technology
However, the fluidity of the existing fluorine rubber is relatively poor, and it is easy to produce flow marks and lack of material during molding and vulcanization.
The traditional vulcanization process cannot manufacture a mandrel that meets the requirements of size and shape, and cannot generate sufficient expansion force under high temperature conditions, so as to achieve uniform pressure on high temperature composite materials
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preparation example Construction
[0036] Further, the present invention provides a method for preparing fluororubber, through the following steps:
[0037] Add vulcanizing agent, oligomers, and chopped fibers to the fluororubber compound in proportion, and knead evenly to obtain the compounded rubber;
[0038] Compound vulcanization.
[0039] The vulcanization in this step is a well-known technology in the art, and the vulcanization process is selected according to the different fluororubber systems.
[0040] In order to further improve the fluidity of the fluororubber during the molding process, the fluororubber compound was thinly passed several times before mixing. This step can increase the plasticity of the fluororubber and contribute to the dispersion of the vulcanizing agent. Experiments have shown that the fluidity increases by 1-2 times when the roll distance is about 0.8 mm and the roll is passed 10 times.
[0041] Further, passing the mixed rubber several times can improve the fluidity of the flu...
Embodiment 1
[0060] Make a high temperature resistant polyimide composite box member, such as figure 2 As shown, the length of the composite box member is 300mm, the width is 100mm, the height is 25mm, and the wall thickness is 3mm.
[0061] The specific implementation process is as follows:
[0065] 2) Fluorinerubber material with a roll distance of about 0.8mm is thinly passed 10 times, and mixed with chopped carbon fiber, oligomer and vulcanizing agent evenly, and then thinly passed 10 times.
[0066] 3) The thinned mixed rubber is vulcanized in the mandrel molding die to obtain a box-shaped fluororubber mandrel with a thickness of 16mm.
[0067] The process gap between the core mold and the inner surface of the molded product is 1.3-1.4mm, the vulcanization temperature is 150°C, and the vulcanization time is determined to be 65 minutes according to the above formula and tes...
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Abstract
Fluororubber and a thermal expansion molding method are provided. The fluororubber comprises the following components in parts by mass: 100 parts of a fluororubber sizing material, 0-10 parts of chopped fibers, 5-25 parts of an oligomer and a proper amount of a vulcanizing agent. The oligomer is stable at the vulcanization temperature of a fluororubber system, does not chemically react with othercomponents of fluororubber, and is decomposed into micromolecular substances at the working temperature of the fluororubber system. The oligomer is added into the fluororubber, and can be decomposed into small molecules at high temperature, the problem that the fluororubber cannot generate enough expansive force at high temperature is effectively solved, stable and uniform thermal expansion pressure is provided under the high-temperature condition of the fluororubber, and a reliable process method is provided for forming of the high-temperature-resistant resin matrix composite.
Description
technical field [0001] The invention relates to a fluorine rubber and a thermal expansion molding method, belonging to the technical field of composite material molding. Background technique [0002] The thermal expansion process refers to the molding method in which the composite material prepreg is processed and solidified by the thermal expansion of the silicone rubber mandrel in the closed rigid female mold. The core mold of the traditional thermal expansion process is mainly made of silicone rubber, and the core mold can generate expansion pressure in all directions without the need for an external pressure source, and is especially suitable for the molding of composite components with complex structures. However, as the curing temperature of composite materials continues to increase, traditional silicone rubber mandrels will age rapidly in high-temperature environments, and micro-cracks will appear on the surface and become hard and brittle, which cannot effectively pr...
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