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A technology of chopped fiber and premix, applied in the field of composite materials, can solve the problems of low production efficiency, gradient change, high labor cost, and achieve the effect of improving production efficiency
Inactive Publication Date: 2022-01-21
北京元蛋复合材料有限公司
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Problems solved by technology
[0003] The technical problem solved by the present invention is that the preparation of aerospace ablation heat-resistant chopped fiber / phenolic premix by manual premixing process has high labor intensity, low production efficiency, high labor cost, product quality is related to operator proficiency, premix Disadvantages such as large dispersion of resin content and gradient change of glue content in the vertical direction
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Embodiment 1
[0028] The high-silica short fiber / aminophenol aldehyde premix and its composite material described in this embodiment are prepared from high-silica short fiber, aminophenol aldehyde, and absolute ethanol.
[0029] The preparation method of the high silica chopped fiber / aminophenol aldehyde premix and its composite material described in the present embodiment is specifically as follows:
[0030] 1. Use (100-200) purpose copper or stainless steel filter to filter the resin;
[0031] 2. The cut length of high silica fiber is 24mm, and heated in an oven at (120±5)°C for 4 hours;
[0032] 3. Weigh (35.5-37.5) kg of aminophenol-formaldehyde resin and pour it into the kneader, add (23-25) L of absolute ethanol, and rotate forward (1-2) min to mix the resin solution evenly;
[0033] 4. Weigh (45±0.1)kg high silica glass fiber chopped strand;
[0034] 5. Spin yarn three times. First, put 15kg of high-silica glass fiber chopped strands evenly into all parts of the kneader, and turn ...
Embodiment 2
[0046] The high-silica chopped fiber / magnesium phenolic premix and its composite material described in this embodiment are prepared from high-silica chopped fiber, magnesium phenolic resin, and absolute ethanol.
[0047]The preparation method of the high silica chopped fiber / magnesium phenolic premix and composite material described in the present embodiment is specifically as follows:
[0048] 1. Use (100-200) purpose copper or stainless steel filter to filter the resin;
[0049] 2. The cut length of high silica fiber is 24mm, and heated in an oven at (120±5)°C for 4 hours;
[0050] 3. Weigh (44-47) kg magnesium phenolic resin and pour it into the kneader, add (19-22) L absolute ethanol, and rotate forward (1-2) min to mix the resin solution evenly;
[0051] 4. Weigh (45±0.1)kg high silica glass fiber chopped strand;
[0052] 5. Spin yarn three times. First, put 15kg of high-silica glass fiber chopped strands evenly into all parts of the kneader, and turn forward for 30s; ...
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Abstract
The invention provides an intermittent same-direction vacuum mechanical premixing preparation method for a spaceflight ablation heat-proof non-conductive chopped fiber/phenolic aldehyde premix. The method is characterized in that firstly, by using intermittent mechanical premixing, that is, multi-cycle short-time kneading, fibers can be completely infiltrated by resin, moreover, the uniformity of the premix can be ensured, and the problem that the fibers are damaged due to too long kneading time can be avoided; secondly, by using same-direction mechanical premixing, the collision intensity and collision frequency of dispersion system molecules are reduced, and phase separation, sedimentation, precipitation and the like are prevented; and thirdly, vacuum mechanical premixing is used, and after multi-cycle kneading, dealcoholization treatment is performed in a vacuum state, such that it is ensured that the glue content does not generate gradient changes when the premix is aired. According to the method, compared with a manual premixing method, the intermittent same-direction mechanical premixing method has the advantages that the number of operators is reduced by 71.4%; the resin content uniformity is superior to that of the manual premixing method; the mechanical property of a composite material is equivalent to that of a composite material obtained by premix mould pressing through the manual premixing method; and the premix has no glue content difference in a vertical direction.
Description
technical field [0001] The invention belongs to the technical field of composite materials in new materials, and in particular relates to a preparation method for intermittent vacuum mechanical premixing of aerospace ablation heat-resistant chopped fiber / phenolic premixed material in the same direction. Background technique [0002] Aerospace Ablation Heat Resistant Chopped Fiber / Phenolic Premix is an intermediate material for aerospace vehicle thermal protection composites. The traditional aerospace ablation heat-resistant chopped fiber / phenolic premix production process is manual premixing. The manual premixing process has disadvantages such as high labor intensity, low production efficiency, high labor cost, product quality is related to operator proficiency, large dispersion of premixed resin content, and gradient change in the rubber content in the vertical direction. Contents of the invention [0003] The technical problem solved by the present invention is that t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information
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