Core flooring layer of a light-foamed SPC floor and a light-foamed SPC floor

A core flooring used as a core flooring layer of a light-foamed stone plastic composite (SPC) floor, wherein the core flooring contains, based on its total weight, 65.0-75.0 wt % of calcium carbonate, 18.0-25.0 wt % of polyvinyl chloride (PVC) resin powder, 2.2-3.0 wt % of a foaming regulator, 2.5-3.3 wt % of a stabilizer, 0.10-0.20 wt % of a plasticizer, 0.10-0.15 wt % of an external lubricant, 0.1-0.40 wt % of an ADC foaming agent, and 0.5-1.0 wt % of an NC foaming agent;

• wherein the core flooring does not contain a separately added internal lubricant;
• wherein the calcium carbonate contains, based on the total weight of the core flooring, 10-13 wt % of 700-800 mesh calcium carbonate and 57-62 wt % of 300-500 mesh,
• wherein the NC foaming agent comprises sodium bicarbonate in a content of 50-70 wt %, zinc stearate in a content of 5-15 wt %, p-toluenesulfonyl semicarbazide in a content of 5-15 wt %, silicon dioxide in a content of 5-15 wt %, magnesium stearate in a content of 5-10 wt %, and sodium acetate in a content of 2-3 wt %, based on the total weight of the NC foaming agent;
• and
• the ADC foaming agent comprises azodicarbonamide in a content of 99.4-99.8 wt %, urea in a content of 0.1-0.3 wt %, polyacrylamide in a content of 0.1-0.2 wt %, and sodium cyanate in a content of 0.04-0.07 wt %, based on the total weight of the ADC foaming agent.