Light automobile cover plate and preparation method thereof
A car cover, lightweight technology, applied in the direction of coating, bulk chemical production, etc., can solve the problems of high brittleness, poor toughness, limited high-performance materials, etc. of phenolic resin, to improve elastic modulus and strength, light weight, The effect of improving uniformity
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[0037] The present invention also provides a preparation method of flame-retardant high-strength light-weight phenolic resin, comprising the following steps:
[0038] (1) After mixing the raw material phenol, the first part of the raw material aldehyde, the catalyst, the long fiber with a length of 5-20 microns, the modified silica, the foaming agent and the surfactant in an organic solvent, heat it at 80-120°C Reflux for 3 to 5 hours to obtain a prepolymer;
[0039] (2) Add short fibers with a length of 0.3 to 2 microns and the second part of raw material aldehyde to the prepolymer, ultrasonically disperse for 30 to 60 minutes, and then reflux at 90 to 110°C for 1 to 2 hours to form a gel;
[0040] (3) Gel heat treatment: place the gel in steam at a pressure of 150-500kPa and a temperature of 130-200°C for 1-3 hours, and then cool to room temperature to obtain a flame-retardant high-strength light phenolic resin.
[0041] In the present invention, at first phenolic resin mon...
Embodiment 1
[0060] (1) Preparation of flame-retardant high-strength light-weight phenolic resin:
[0061] 100g of o-cresol, 100g of paraformaldehyde, 20g of sodium hydroxide, 25g of polyethylene fiber (Mw=4.5×10 6 ), 30g of amino-modified silicon dioxide with an average diameter of 150 nanometers, 15g of azodicarbonamide and 5g of sodium N-lauroyl sarcosinate were uniformly mixed in 280g of N-methylpyrrolidone, and refluxed at 100°C for 4h. Obtain a prepolymer; add 30g of short fibers with a length of 1 micron and 20g of paraformaldehyde to the prepolymer, ultrasonically disperse for 45min, and then reflux at 100°C for 1.5h to form a gel;
[0062] Gel heat treatment: place the gel in N-methylpyrrolidone vapor at a pressure of 250kPa and a temperature of 200°C for 1.5h, then cool to room temperature to obtain a flame-retardant high-strength light phenolic resin;
[0063] Put the flame-retardant high-strength light-weight phenolic resin in the mold, and press it for 10 minutes at a tempera...
Embodiment 2
[0068](1) Preparation of flame-retardant high-strength light-weight phenolic resin:
[0069] With 100g m-cresol, 100g paraformaldehyde, 15g sodium hydroxide, 16g length is the polyethylene fiber (Mw=3×10 6 ), 20g of amino-modified silicon dioxide with an average diameter of 200 nanometers, 10g of 4,4-oxobisbenzenesulfonyl hydrazide and 8g of dodecylbenzenesulfonic acid were mixed uniformly in 240g of liquid paraffin, and the Reflux for 3.5 hours to obtain a prepolymer; add 24 g of short fibers with a length of 500 nm and 25 g of paraformaldehyde to the prepolymer, ultrasonically disperse for 45 minutes, and then reflux at 100 ° C for 1 hour to form a gel;
[0070] Gel heat treatment: place the gel in liquid paraffin vapor at a pressure of 300kPa and a temperature of 150°C for 2 hours, then cool to room temperature to obtain a flame-retardant, high-strength, light-weight phenolic resin;
[0071] Put the flame-retardant high-strength light-weight phenolic resin in the mold, pre...
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