A method for resin infusion pretreatment of foam materials in the molding of composite foam sandwich structures
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A composite material and sandwich structure technology, which is applied in the field of composite material foam sandwich structure molding, can solve the problems of high cost, limited interface bonding effect, low uniformity of resin coating, etc. The effect of quality improvement
Active Publication Date: 2016-09-07
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However, the disadvantages of these two methods are that the uniformity of the resin coating is too low, and it is difficult to completely penetrate and fill the foam pores of the composite material; The preparation of the adhesive film machine is costly. For low-viscosity resin molding processes such as vacuum-assisted resin infiltration or hand lay-up, it is difficult for the adhesive film to penetrate into the foam pores of the composite material, and the effect on enhancing the interface adhesion is limited. Therefore, it is urgent to improve the composite material foam. Sandwich structure forming method
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Embodiment 1
[0025] Example 1: pretreatment of resin vacuum infusion foam material, and then adopting vacuum-assisted resin infiltration process to form a composite foam sandwich structure.
[0026] Molding raw materials: epoxy resin, CYCOM890, Cytec;
[0033] Step 1: Heat 1 kg of epoxy resin to the infusion temperature of 90°C to make the resin viscosity reach 0.2 Pa·s;
[0034] Step 2: Assemble the resin vacuum infusion device according to Figure 1; on the infusion mold, place the diversion net 2, peelable cloth 3, PMI material foam 4 (200mm×200mm×10mm), peelable cloth 5, and diversion net in seq...
Embodiment 2
[0039] Embodiment 2 The present invention and prior art comparative effect
[0040] to combine figure 2 , Composite foam sandwich structure for comparison of panel bonding interface conditions.
[0041] The picture on the left is a sample of PMI material foam sandwich structure without resin infusion pretreatment.
[0042] The picture on the right is a PMI material foam sandwich structure sample (Example 1) after the PMI material foam is pretreated by the method of the present invention.
[0043] Depend on figure 2 It can be clearly observed that the PMI material foam without resin infusion pretreatment is at the interface between the PMI material foam and the carbon fiber panel, the PMI material foam hole is black, there is no resin, and the interface bonding quality is poor. However, the method of the present invention pours the pretreated sample into the foam resin of the PMI material, and the foam holes at the interface are white, filled with resin, and the interface ...
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Abstract
The invention provides a method for performing resin filling infusion pretreatment for a foam material in formation of a composite material foam sandwich structure. The method forms uniform resin bonding layer in the interface place of foam and a panel through performing the resin infusion pretreatment for the foam. The method performs the resin infusion for the foam by adopting an auxiliary vacuum permeation method, that is, the foam is sealed in a vacuum state, the resin is infused in holes in the surface of the foam by the negative vacuum pressure when the viscosity is lower, and the resin temperature rising and keeping treatment is performed, so that the resin is prepolymerized, the viscosity is increased, and the resin is fixed and remained in the holes in the surface of the foam to form a resin layer. After the resin infusion treatment is performed for the foam, the foam is bonded with a fiber panel to solve the interface defect problem. The method is simple, and is suitable for the industrial production.
Description
technical field [0001] The invention relates to a molding method of a composite material foam sandwich structure, in particular to a method for performing resin infusion pretreatment on composite material foam during molding of a composite material foam sandwich structure. Background technique [0002] In the molding process of the composite foam sandwich structure, when the composite foam is bonded to the fiber cloth, the fiber bundles on the surface of the fiber cloth are tightly arranged and have a strong capillary adsorption effect, which leads to the composite material in the molding process. Adsorption of low-viscosity resin at the interface between the foam and the panel (low-viscosity resin molding process such as vacuum-assisted resin infiltration, resin transfer molding, hand lay-up, etc.), resulting in the formation of resin void defects at the interface after the structure is formed. If a high-viscosity resin molding process (such as molding, etc.) is used, it wi...
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