Lignin-reinforced PVA foaming material preparation method

The invention discloses a lignin-reinforced PVA foaming material preparation method, which comprises: adding PVA to deionized water, carrying out heating dissolving, adding alkali lignin and a foamingagent to deionized water and dissolving, adding the alkali lignin mixing solution to the PVA solution, adding a cross-linking agent and a plasticizer, carrying out water bath stirring for a certain time, taking out the mixed solution, foaming the foaming agent, uniformly stirring, placing into an oven, carrying out cross-linking curing, and carrying out water washing to remove the unreacted cross-linking agent and the unreacted foaming agent. According to the present invention, the polyvinyl alcohol foaming material has characteristics of low cost, biodegradability under natural conditions and poor mechanical property; by introducing lignin into the PVA foaming material system, the prepared lignin/PVA foaming material has advantages of good weathering resistance, good chemical stability,good biocompatibility and