Method for preparing humic acid modified phenolic aldehyde foamed material
A technology of phenolic foam material and humic acid, which is applied in the field of preparation of modified phenolic foam material, can solve the problems of resources, output and price limitations, phenolic foam brittleness and heat resistance need to be improved and improved, and achieve improved performance and good performance , The effect of broadening the application field
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Embodiment 1
[0014] The lignite is extracted with a compound alkaline extracting solution (a compound of sodium hydroxide and sodium pyrophosphate), and the filtrate is acidified with 20% hydrochloric acid solution until the pH is 1-2. After purification, the precipitate is centrifuged, washed, and repeated several times until the product is neutral, and then the precipitate is taken and dried to obtain a solid powder that is humic acid (HA). Take an appropriate amount of humic acid, add a NaOH solution with a mass fraction of 10%, and the solid-to-liquid ratio is about 1:5 to completely dissolve the HA. Slowly add a certain amount of formaldehyde in a nitrogen atmosphere and slowly heat to 90°C. After reacting for 2 hours, cool, and then , acid analysis, centrifugation, washing to neutrality, and drying to obtain hydroxymethylated humic acid (FHA).
[0015] Based on phenol, the mass fraction of FHA in phenol is 30%, the mass ratio of formaldehyde, phenol and hydroxymethylated humic acid ...
Embodiment 2
[0017] The lignite is extracted with a compound alkaline extracting solution (a compound of sodium hydroxide and sodium pyrophosphate), and the filtrate is acidified with 20% hydrochloric acid solution until the pH is 1-2. The precipitate is purified, centrifuged, washed, and repeated several times until the product is neutral, and then the solid obtained by drying the precipitate is humic acid (HA). Take an appropriate amount of humic acid, add a NaOH solution with a mass fraction of 10%, and the solid-to-liquid ratio is about 1:5 to completely dissolve the HA. Slowly add quantitative phenol in a nitrogen atmosphere and slowly heat to 90°C. After reacting for 2 hours, cool, and then , acid analysis, centrifugation, washing to neutrality, and drying to obtain phenolic humic acid (PHA).
[0018] Based on phenol, the mass fraction of PHA in phenol is 40%, the mass ratio of formaldehyde, phenol and humic acid mixture is 2.2:1, 20% NaOH solution is used as a catalyst, the pH is ad...
Embodiment 3
[0020] Add NaOH solution with a mass fraction of 10% to humic acid (HA) to completely dissolve HA, slowly add quantitative formaldehyde in a nitrogen atmosphere and slowly heat to 90°C, react for 2 hours and cool down, then, acid precipitation, centrifugation, and washing until Neutral, oven-dried to obtain hydroxymethylated humic acid (FHA). Based on phenol, the mass fraction of FHA in phenol is 15%, the mass ratio of formaldehyde, phenol and hydroxymethylated humic acid mixture is 1.5:1, 20% NaOH is used as a catalyst, the pH is adjusted to 8.5, and the temperature is raised slowly to 90°C and react for 2 hours; after the reaction is over, the reaction liquid is neutralized with acetic acid to a pH value of about 7, and dehydrated under reduced pressure at 70°C until the solid content is about 80% to obtain a resole phenolic resin. It is 1.5~2.0Pa.s. Take an appropriate amount of the above resin, under high-speed stirring conditions, based on the quality of the resole pheno...
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