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Lining layer of wet wound composite product, and preparation method thereof
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A composite material, wet winding technology, applied in the field of composite materials, to achieve the effect of eliminating the interface, convenient operation, and ensuring the reliability of use
Inactive Publication Date: 2018-12-28
SHANDONG NON METALLIC MATERIAL RES INST
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[0005] The purpose of the present invention is achieved in this way, for the resin system of wet winding composite products, the semi-cured prepreg of the same material system with suitable curing degree is used as the lining laying material, and the inner lining laying material is controlled by means of thermal analysis technology. The degree of curing, the prepreg with high resin content can give the inner lining layer and the structural layer good adhesion, eliminate the interface problem between the inner lining layer and the structural layer, and keep the inner lining layer and the winding structural layer under load. Stress and strain state, improve the bearing capacity and fatigue life of the product
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Embodiment 1
[0019] The wet winding resin system is E51 epoxy resin: methyl hexahydrophthalic anhydride curing agent: SN-2 toughening agent: dimethylbenzylamine accelerator = 100:90:7:1, measured by isothermal and non-isothermal DSC According to the calculation, the conditions for the curing degree of the resin system to reach 45% are 90°C and 1h30min;
[0020] The surface of the flat mold is 500×500mm, and the bottom of the frame around the mold is lined with a silicone rubber cushion. Each frame has 4 bolts to connect with the flat mold, and the bottom of the mold has 3 support bolts;
[0021] Use glass fiber orthogonal cloth of 550×550×0.03mm as the fiber support cloth; lay the release paper and the support cloth on the flat mold in sequence, press it with the four frames of the mold after laying flat, and use the frame bolts to connect with the flat plate The mold connection is tight;
[0022] Put the mold in a vacuum oven, adjust the flat plate with a level until the mold surface is ...
Embodiment 2
[0026] The wet winding resin system is bismaleimide: bisphenol A cyanate: epoxy resin E51: organotin accelerator = 30:35:35:0.8, using isothermal and non-isothermal DSC to measure the curing degree of the resin system The condition to reach 50% is 140℃, 20min;
[0027] (2) Choose 0.1mm carbon fiber twill cloth as the fiber support cloth;
[0028] (3) Choose a flat mold with a size of 500×500×25mm. The bottom of the frame around the mold is lined with a silicone rubber cushion. Each frame has 4 bolts to connect with the flat mold, and the bottom of the mold has 3 support bolts;
[0029] (4) Lay the release paper and the carbon fiber support cloth in (2) on the flat mold in sequence, the size is 550×550mm, after laying flat, press it with the four frames of the mold, and then use the frame bolts to connect with the flat mold Tight, according to the need to calculate the amount of resin mixture poured into the flat mold, so that the resin content of the fabric prepreg is 91%wt; ...
Embodiment 3
[0032] (1) The wet winding resin system is selected as unsaturated resin DC191: initiator: accelerator: inhibitor manganese naphthenate = 100:5:1:0.15, measured and calculated by isothermal and non-isothermal DSC, the resin system Under the isothermal condition of 45°C, the time for the resin curing degree to reach 55% is 92 minutes;
[0033] (2) Choose 0.2mm aramid fiber orthogonal cloth as the fiber support cloth;
[0034] (3) Choose a flat mold with a size of 500×500×25mm. The bottom of the frame around the mold is lined with a silicone rubber cushion. Each frame has 4 bolts to connect with the flat mold, and the bottom of the mold has 3 support bolts;
[0035] (4) Lay the release paper and the aramid fiber support cloth in (2) on the flat mold in sequence, the size is 550×550mm, after laying flat, press it with the four frames of the mold, and then use the frame bolts to connect with the flat plate The mold is tightly connected, and the amount of resin mixture poured into...
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Abstract
The invention belongs to the technical field of composite forming, and relates to a lining layer of a wet wound composite product. Semi-curing prepreg with the suitable curing degree and same materialsystem is adopted as a lining laying layer material, the curing degree of the lining laying layer material is controlled through a thermal analysis technology, the lining layer and a structural layerare bonded well through the prepreg with the high resin content, the interface problem between the lining layer and the structural layer is eliminated, the bearing capacity of the product is improved, and the fatigue life of the product is prolonged. The lining layer of the wet wound composite product is the fabric prepreg with the substrate resin curing degree being 45%-55%, and a lining layer patch with the resin content being not smaller than the 90%wt is pre-cured till the surface is not sticky. The lining layer is moderate in viscosity, dense in structure and free of inclusion air holes,the lining layer and the product are cured simultaneously, operation is convenient, the interface between the structural layer and the lining layer of the wound composite product is effectively eliminated, and the using reliability of the product is guaranteed. The lining layer is suitable for the wet winding process, and especially suitable for composite product forming which has high requirements for overall structural performance and fatigue resistance of wound parts.
Description
technical field [0001] The invention belongs to the technical field of composite materials, and relates to composite material product forming technology, in particular to wet winding composite material product forming technology. Background technique [0002] At present, the inner linings of wet winding parts mainly include metal linings such as aluminum alloy, titaniumalloy, and steel, as well as non-metallic linings such as polyethylene, polyvinylidene fluoride, and rubber. The material structure is not the same material, forming an interface that includes the entire winding part. The bonding strength of this interface is a major bottleneck restricting the application of the above-mentioned lining. At the same time, the lining and the winding structure layer show a large difference under load. Stress-strain regimes leading to abnormal failure of wet-wound components under load. [0003] CN105508809A The method for preparing the inner lining layer is to use the surface fe...
Claims
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Application Information
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