Cannabidiol-containing bio-based polyurethane composite material and preparation method thereof

A cannabidiol (CBD)-containing bio-based polyurethane composite material, wherein the cannabidiol (CBD)-containing bio-based polyurethane composite material is prepared from a component A and a component B in a weight ratio of 100:(20-50);

• wherein the component A comprises:
• 40-60 parts by weight of a vegetable oil-based polyol;
• 35-50 parts by weight of polyether polyol I;
• 0-10 parts by weight of polyether polyol II;
• 0.5-5 parts by weight of CBD;
• 0-5 parts by weight of a natural pigment;
• 0.5-3 parts by weight of silicon oil;
• 0-5 parts by weight of a cross-linking agent;
• 0.2-1 part by weight of a catalyst;
• and
• 0.8-4 parts by weight of water;
• the component B comprises:
• 20-50 parts by weight of modified methylene diphenyl diisocyanate (MDI);
• wherein the polyether polyol I is 15% ethylene oxide-capped propylene oxide polyether polyol having a number-average molecular weight of 1000-2000, a functionality of 3 and a hydroxyl value of 50-170 mg KOH/g;
• and the polyether polyol II is 15% propylene oxide-capped ethylene oxide polyether polyol having a functionality of 2 and a hydroxyl value of 100;
• and
• the modified MDI is prepared by modifying isocyanate with palm oil through steps of:
• 1) Weighing 100 parts by weight of the palm oil, 70-80 parts by weight of MDI-50 and 20-30 parts by weight of polymeric MDI;
• and
• 2) Dewatering the 100 parts by weight of the palm oil to a moisture content of less than 0.05% at 110-120° C.;
• adding 40-50 parts by weight of the MDI-50 into the dewatered palm oil at 75-80° C.;
• heating the reaction mixture under stirring to 100° C. followed by reaction for 2-4 h;
• cooling the reaction mixture to room temperature;
• and adding the 20-30 parts of the polymeric MDI and the remaining MDI-50 into the reaction mixture followed by stirring to produce the modified MDI.