Effect of calcium carbonate on the properties of melamine urea-formaldehyde resin adhesive
Melamine urea-formaldehyde(MUF)resin is widely used in China.In order to use a small amount of modifier to play a positive role in the adhesion strength and water resistance of MUF resin,200 mesh(0.074 mm)calcium carbonate powder was used as a modifier for MUF resin.Modified MUF resin was prepared using common urea formaldehyde resin synthesis process,and the amount of modifier was only 0.5%of the total mass of the resin.The physical and chemical properties of each group of resins were tested,and the physical and mechanical properties of the medium density fiberboard prepared by the resins were also tested.The results showed that the addition of calcium carbonate significantly increased the viscosity and curing time of MUF resin;Calcium carbonate could significantly improve the mechanical properties of the fiberboards,MOR increase was more than 15%to 39.23 MPa;The water resistance of the modified MUF resin bonded plates was also improved.
Calcium carbonateMelamineUrea-formaldehyde resinMedium density fiberboard