The Preparation And Properties Research Of Humic Acid Modified Phenolic Foam Material

The main research of this topic is humic acid modified phenolic foam material. Used humic acid (HA) and fulvic acid (FA) as modifier, with its partly replace phenol to preparate phenolic foam material. The main research include extraction and modification of humic acid raw materials, Preparation and performance testing of modified phenolic foam material, Synthesis process optimization and foam process of the research。1. extraction and modification of the HA and FAAdopt the method of Alkali dissolve and acid out in extracting humic acid, Use homemade formulation alkali liquor (sodium hydroxide-sodium pyrophosphate solvent,2:1wt/wt) Processing lignite can effectively extract HA and FA。PHA was the HA modified by phenolization, Using NMR spectrum, infrared and detection means can see modification effect is good. phenolization humic acid (PHA) has two strong of benzene rings protons hydrogen peak appear between6.4-7.2PPM in NMR spectrum, Strength than HA here peak intensity. IR spectrum of PHA show Fang ring skeleton absorption peaks between1500～1620cm-1no longer so sharp。Indicate PHA macromolecules actually took place decomposition, HA rigid macromolecular structure reduced due to Chemical bonds happened fracture. Furthermore, Hydroxyl value determination show that Hydroxyl value increased by52%after modification, Explain the modified by phenolization can increase the number of active hydroxyl functional groups of HA. With polyethylene glycol (peg)-1000modification phenolic foam on toughening processing, and good results have been achieved.2. Preparation of modified phenolic foam materialrespectively using the PHA or HA reacted with phenol and formaldehyde, Design the route of PHA and FA modified phenolic foam。Obtained the addition amount of PHA, FA, phenol, formaldehyde, and surface active agent, foaming agent, curing agent on the influence of product performance. Draw optimization formula through the analysis of range and Orthogonal factors rendering:PHAPF synthesis of the formula is that F/P Molar ratio is2.2:1, PHA/P mass ratio is45%, temperature is90℃, time is1OOmin; FAPF synthesis of the formula is that F/P Molar ratio is2.2:1, FA/P mass ratio is45%, temperature is90℃, time is120min; Analyzed the relationship between the surface active agent dosage, curing agent dosage, blowing agent dosage, foaming temperature and apparent density, When the surface active agent dosage is6g, curing agent dosage is12g, blowing agent is8g and foaming temperature is90℃most suitable.3. properties characterization of modified phenolic foam materialProved humic acid and formaldehyde is chemically connected in modified phenolic foam material through IR, TG and nitrogenadsorption. Humic acid is as a kind of reaction of raw materials. Modified PF in hot performance still a good one, when in400℃,45%PHAPF residual heat is84.1%,45%FAPF residual heat is81.4%.Nitrogen adsorption experiment proved modified phenolic foam material have uniform, the complete and continuous, complex nanopore structure, Can effectively reduce the coefficient of thermal conductivity. Free formaldehyde content measurement show the free formaldehyde content of45%FAPF and45%PHAPF respective is0.08%and0.10%, accorded With National Standard. Moreover, The oxygen index, compression strength, impact strength of modified phenolic foam material all can meet the industry needs.