Method for preparing sand-coated phenolic resin
The invention provides a method for preparing sand-coated phenolic resin, which comprises the steps: mixing waste fluid containing phenol, aldehyde solution and catalyst to be subject to condensation reaction at the constant temperature of 90-110 DEG C, wherein mass ratio of total mass of the waste...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention provides a method for preparing sand-coated phenolic resin, which comprises the steps: mixing waste fluid containing phenol, aldehyde solution and catalyst to be subject to condensation reaction at the constant temperature of 90-110 DEG C, wherein mass ratio of total mass of the waste fluid containing phenol and the aldehyde solution to the catalyst is 100:(1-5), and the mass ratio of the phenol in the waste fluid containing phenol to aldehyde in the aldehyde solution is 100:(25-40); standing and then separating a condensation reaction product to obtain phenolic resin fluid with low molecular weight and low-concentration waste fluid containing phenol; mixing the phenolic resin fluid with the low molecular weight and an initiator to perform polymerization reaction at the constant temperature of 140-160 DEG C, finishing the reaction until weight-average molecular weight of the product is 1000-1600 and obtaining the sand-coated phenolic resin, wherein the mass ratio of initiator to the phenolic res |
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