Dry fiber material for subsequent resin infusion
A fiber material, drying technology, applied in the direction of thin material processing, transportation and packaging, coating, etc., can solve the problems that cannot meet the physical, thermal-mechanical and process requirements of manufacturing dry fiber materials
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example 1
[0128] The following fabrics were used in this example.
[0129] (1) Unidirectional non-wrinkle fabric (UDNCF), supplied by Satex, as figure 1 shown. Make this fabric 50 inches wide. The carbon beams are clearly defined and the gaps between the beams are up to 2mm wide. Polyester stitching keeps the carbon strands together. Thin polyester threads are laid across the fabric, providing lateral integrity and stability to the fabric.
[0130] (2) Expanded web with binder yarns (Sigma United Fiber Fabric), such as figure 2 shown. The carbon bundles were unwound and held together by epoxy-coated glass wires on both sides of the tape. There are no interfascicular or marginal gaps.
[0131] Both fabrics were coated with a thermoplastic modified epoxy-based adhesive (from Cytec Engineered Materials (Cytec Engineered Materials) 7720) for adhesive coating. About 5 gsm of adhesive composition was deposited on both sides of each fabric using the dusting method. The dusting fabr...
example 2
[0134] A series of different catalyzed and uncatalyzed adhesives, copolymers or combinations thereof based on the polyhydroxyether or polyurethane family were mixed according to the compositions disclosed in Table 1 . EP1 is a 53% solids aliphatic epoxy novolak emulsion commercially available from COIM (Italy). PU1 is a 52% solids aqueous dispersion of 2,2-bis(4-hydroxyphenyl)propane-modified polyurethane with a number average molecular weight of about 30,000 Daltons. The polyurethane part is obtained by the reaction of isophorone diisocyanate and polypropylene glycol. PU2 is a 40% solids self-crosslinkable thermoplastic polyurethane dispersion in water commercially available from BASF, while PU3 and PU4 are 43% solids and 34% solids self-crosslinkable polyesters in water A type polyurethane dispersion, commercially available from Bayer Material Science. PHE1 is a 34% solids polyhydroxyether emulsion in water commercially available from International Chemicals (US).
[0135...
example 3
[0152] Some of the adhesive compositions disclosed in Table 1 were used to dip coat the same unidirectional wrinkle-free fabric as described in Example 1 (Sartex-Germany) at room temperature. All coated fabrics were then dried in an oven at 100°C for 3 minutes, then at 130°C for 4 minutes.
[0153] The adhesive-coated wrinkle-free fabric is then cut into smaller layers and the layers are laid in stacked order. The laminate was then preformed in an oven at 130°C for 30 minutes, and the EP2400 (toughened epoxy system from Cytec Engineering Materials) infusion. Formation of V after curing the infusion preform at 180 °C for 2 h f (fiber volume fraction) in the range of 55% to 57%.
[0154] For comparison purposes, an otherwise identical test panel (Control 1 ) was prepared using the same virgin (uncoated) unidirectional unwrinkled fabric. Various mechanical tests were performed on the panels and the results are shown in Table 3 below.
[0155] table 3. Thermo-mechanical pr...
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