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A kind of fluorine rubber and thermal expansion molding method
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A molding method and fluororubber technology, applied in the field of composite material molding, can solve the problems of easy generation of flow marks, lack of material, poor fluidity of fluororubber, etc., and achieve the effects of good fluidity, less equipment investment and low manufacturing cost
Active Publication Date: 2022-08-09
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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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 kind of preparation method of fluororubber, through the following steps:
[0037] The vulcanizing agent, oligomer and chopped fiber are added to the fluorine rubber compound in proportion, and mixed evenly to obtain a mixed 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 different fluororubber systems.
[0040] In order to further improve the fluidity of the fluororubber in the molding process, the fluororubber compound is thinned several times before mixing. This step can increase the plasticity of the fluororubber and help the dispersion of the vulcanizing agent. Experiments show that the fluidity increases by 1 to 2 times when the roll distance of about 0.8 mm is used for 10 thin passes.
[0041] Further, thinly passing the mixed rubber several times can improve the fluidity of the fluororubber sys...
Embodiment 1
[0060] Make a high temperature polyimide composite box-shaped component, such as figure 2 As shown, the composite box-shaped member has a length of 300 mm, a width of 100 mm, a height of 25 mm, and a wall thickness of 3 mm.
[0061] The specific implementation process is as follows:
[0065] 2) The fluorine rubber compound is thinly passed 10 times with a roll distance of about 0.8 mm, mixed with chopped carbon fiber, oligomer and vulcanizing agent evenly, and then thinned for 10 times.
[0066] 3) The mixed rubber after thinning is vulcanized in a core mold forming mold to obtain a box-shaped fluororubber core mold with a thickness of 16 mm.
[0067] The process gap between the core mold and the inner surface of the molded product is 1.3-1.4 mm, the vulcanization temperature is 150°C, and the vulcanization time is determined to be 65 minutes according to the a...
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Abstract
The present invention provides a fluororubber and a thermal expansion molding method, comprising the following components and parts by mass: 100 fluororubber rubber, 0-10 chopped fibers, 5-25 oligomers, and an appropriate amount of vulcanizing agent; The fluororubber system is stable at the vulcanization temperature, and will not chemically react with other components of the fluororubber, and decompose into small molecules at the working temperature of the fluororubber system. The fluororubber of the invention adds oligomers, which can decompose small molecules at high temperature, effectively solve the problem that fluororubber cannot generate sufficient expansion force under high temperature conditions, and provide stable and uniform thermal expansion pressure under high temperature conditions of fluororubber. It provides a reliable process method for the molding of high temperature resistant resin matrix composites.
Description
technical field [0001] The invention relates to a fluororubber and a thermal expansion molding method, and belongs to the technical field of composite material molding. Background technique [0002] The thermal expansion process refers to a molding method in which the composite material prepreg is processed and cured by the thermal expansion of the silicone rubber core mold in the closed rigid female mold. The core mold of the traditional thermal expansion process is mainly made of silicone rubber. The core mold can generate expansion pressure in all directions without an external pressure source, and is especially suitable for the molding of composite components with complex structures. However, with the continuous increase of the curing temperature of the composite material, the traditional silicone rubber mandrel will age rapidly in a high temperature environment, and the surface will produce micro-cracks and become hard and brittle, which cannot effectively provide therm...
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