A method for preparing a sandwich profile by a fiber-reinforced resin pultrusion process and the obtained profile
A fiber-reinforced resin and pultrusion technology, which is applied in the field of fiber-reinforced resin composite materials, can solve the problems of unsatisfactory dimensional stability, low output rate of high-quality products, poor continuous production capacity, etc., so as to improve the output of high-quality products. rate, good product quality stability, and the effect of reducing production costs
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Embodiment 1
[0052] Dissolve 100g of epoxy resin with an epoxy value of 0.1, 0.2g of the corresponding curing agent, and 0.2g of the accelerator in an acetone solvent and mix them uniformly to form a resin solution; then impregnate the glass fiber in the resin solution Fully impregnated;
[0053] Using the pultrusion molding process, under the action of the external force traction system, the impregnated fiber passes through the preforming device at a speed of 3cm / min and closely adheres to the upper and lower surfaces of the lightweight foam material to form a composite material. After testing , the thickness ratio of impregnated fiber to core material on one side of the combined material is 0.1, and the average density of the lightweight foam material is 0.9g / cm³, using a uniform heating method for it, the heating rate is calculated as S=1 / 2 0.1 10² 0.9 3 1 / 2 =7.79 (°C / min), actually use a rate of 7.8°C / min to heat up to 100°C until fully cured and cut into fixed-size profiles.
[0054...
Embodiment 2
[0057] Dissolve 100g of epoxy resin with an epoxy value of 0.25, 20g of curing agent, and 1g of accelerator in ethyl acetate solvent and mix them evenly; use the solution impregnation technique to make the glass fibers pass through the blended solution to fully impregnate the fibers;
[0058] Using the pultrusion molding process, under the action of the external force traction system, the impregnated fiber passes through the preforming device at a speed of 10cm / min, so that it is closely attached to the surface of the lightweight honeycomb material to form a composite material. After testing, The thickness ratio of impregnated fiber to core material on one side of the combined material is 0.08, and the average density of the lightweight honeycomb material is 0.6g / cm³. Two-stage heating methods are used for it, and the heating rate of one stage is calculated as S1=1 / 4·0.25·12.5²·0.6·10 1 / 2 =18.51 (°C / min), actually use 18.5°C / min to heat up to 80~100°C, and keep it for 2~5min,...
Embodiment 3
[0062] Dissolve 100g of epoxy resin with an epoxy value of 3.5, 10g of curing agent, and 3g of accelerator in toluene solvent and mix them evenly; through the solution impregnation technique, the carbon fibers are fully impregnated through the blended solution;
[0063] Using the pultrusion molding process, under the action of the external force traction system, the impregnated fiber passes through the preforming device at a speed of 5cm / min, so that it is closely attached to the surface of light wood to form a composite material. After testing, the composite material The thickness ratio of impregnated fiber to core material on one side of the medium is 0.15, and the average density of balsa wood is 0.25g / cm³. Three-stage heating method is used for it, and the heating rate of one stage is calculated as S1=1 / 5·3.5· 6.7² 0.25 5 1 / 2 =17.57°C / min, the actual use rate is 17.6°C / min to raise the temperature to 60°C and keep it for 3 minutes, then carry out the second-stage temperatu...
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