Fiber-reinforced foamed epoxy resin composite material and preparation method thereof
An epoxy resin and fiber-reinforced technology, applied in coatings and other directions, can solve problems such as small deformation shrinkage, car door breakage, and low safety factor, and achieve the effects of improving toughness and strength, increasing strength, and improving compactness
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[0032]Simultaneously, the present invention also provides a kind of preparation method according to the fiber-reinforced foamed epoxy resin composite material of the present invention, comprises the following steps:
[0033] (1) Mix epoxy resin, surfactant, foaming agent, reinforcing fiber, amino-modified silica with a particle size of 100-300 nanometers and the first part of chain extender in an organic solvent, and then React at 80°C for 30-180 minutes to obtain a composite emulsion;
[0034] (2) Add amino-modified silica with a particle size of 50-100 nanometers and the second part of the chain extender to the composite emulsion, and then react at 60-90°C for 60-120 minutes, then add a curing agent, and mix evenly. get the pre-product;
[0035] (3) Heat treatment of the pre-product: treat the pre-product at a pressure of 100-300 MPa and a temperature of 130-200° C. for 5-25 minutes, and then cool to room temperature to obtain a fiber-reinforced foamed epoxy resin composite...
Embodiment 1
[0056] (1) Preparation of amino-modified silica:
[0057] Preparation of amino-modified silica A: Mix 50g of tetraethylorthosilicate in 500mL of sodium hydroxide aqueous solution with a pH of 8, then let it stand at 30°C for 120min, and centrifugally wash to obtain nano-silica. Said nano-silica and silane coupling agent KH550 were uniformly mixed in toluene, and then refluxed at 100°C for 8 hours to obtain amino-modified silica with a particle size of 50 nm and a surface amino content of 0.45 mmol / g;
[0058] Preparation of amino-modified silica B: Mix 50g of tetraethylorthosilicate in 500mL of sodium hydroxide aqueous solution with a pH of 9.5, then let it stand at 30°C for 120min, and wash by centrifugation to obtain a particle size of 50nm Mix the nano-silica and silane coupling agent KH550 in toluene evenly, and then reflux at 85°C for 8 hours to obtain an amino-modified compound with a particle size of 200 nm and a surface amino content of 0.8 mmol / g. Silica;
[0059] (...
Embodiment 2
[0064] (1) Preparation of amino-modified silica:
[0065] Preparation of amino-modified silica A: Mix 38g of tetraethylorthosilicate in 500mL of sodium hydroxide aqueous solution with a pH of 8, then let it stand at 30°C for 120min, and centrifugally wash to obtain nano-silica. Said nano-silica and silane coupling agent KH550 were uniformly mixed in toluene, and then refluxed at 90°C for 8 hours to obtain amino-modified silica with a particle size of 50 nm and a surface amino content of 0.41 mmol / g;
[0066] Preparation of amino-modified silica B: Mix 55g of tetraethylorthosilicate in 800mL of sodium hydroxide aqueous solution with a pH of 10.3, then let it stand at 30°C for 120min, and wash it by centrifugation to obtain silica with a particle size of 50nm. Silica, mix the nano-silica and silane coupling agent KH550 in toluene evenly, and then reflux at 100°C for 6h to obtain an amino-modified compound with a particle size of 250 nanometers and a surface amino content of 0.6m...
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