Fiber-reinforced phenol formaldehyde foam material and preparation method thereof
A fiber-reinforced material and foamed material technology, which is applied in the field of fiber-reinforced phenolic foamed material and its preparation, can solve the problems of poor heat insulation, difficult to achieve light weight, large quality, etc., and achieves improved toughness, mechanical properties, and fatigue properties. superior effect
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Embodiment 1
[0036] A kind of preparation method of fiber-reinforced phenolic foam material, comprises the following steps:
[0037] (1) Add the phenolic resin and foaming agent into the container according to the proportioning ratio, and stir fully, the stirring speed is 30-80r / min, and the stirring time is 30-60min, to prepare the phenolic resin glue.
[0038] Phenolic resin is obtained by polycondensation reaction of phenol and formaldehyde under alkali catalysis, its solid content is more than 65%, pH value is 8.0-9.0; viscosity is 800-1500mPa.s / 25℃, gel time is 98-110s @150℃, the shell of the blowing agent is thermoplastic acrylic polymer, and the core is alkane gas, which will expand after being subjected to a certain temperature. The average diameter of the foaming agent microspheres is 30-40um, and the initial foaming temperature is 110 ℃~120℃, the maximum foaming temperature is 150℃~170℃;
[0039] The mass ratio of the phenolic resin in the phenolic resin glue to the foaming agen...
Embodiment 2
[0055] A method for preparing low-density fiber-reinforced phenolic foamed boards, the preparation method of the prepreg is the same as in Example 1, and the remaining steps and conditions are as follows:
[0056] (1) Stack the prepared preliminary foamed prepreg according to the number of 4 layers per 10mm plate;
[0057] (2) Adjust the plate press to 120°C ~ 135°C, and place pads of 10mm ~ 30mm around;
[0058] (3) Place the stacked prepreg in the flat press;
[0059] (4) Mold clamping and pressing, the pressing time is 20 minutes to 30 minutes, and every 2 minutes, the mold is opened for exhausting. This process makes the prepreg fully foamed for the second time, fills the thickness of the cavity, and finally solidifies;
[0060] (5) Open the mold, take the plate, and cut the edge burrs.
[0061] The board density ≥ 100g / cm 3 , the mechanical properties are shown in Table 2:
[0062] Table 2 Example 2 plate mechanical properties
[0063]
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