Antibacterial mildewproof polyurethane composite material containing natural plant and a preparation method thereof

An antibacterial mildewproof polyurethane composite material containing natural plant, characterized in that, said material is prepared from a component A and a component B in a weight ratio of 100:(20-50) by weight,

• wherein the component A comprises:
• 30-60 parts by weight of a plant oil-based polyether polyol;
• 20-50 parts by weight of polyether polyols I;
• 5-20 parts by weight of polyether polyols II;
• 5-20 parts by weight of a composite plant extract;
• 0-0.5 parts by weight of a catalyst;
• 0.5-2 parts by weight of a surfactant;
• 0-2 parts parts by weight of a cross-linking agent;
• and
• 1.5-3 parts by weight of foaming agents;
• and
• wherein the component B is modified methylene diphenyl diisocyanate;
• wherein the plant oil-based polyether polyol is a soybean polyol with a functionality of 2-14 and a hydroxyl value of 55-240 mg KOH/g;
• the polyether polyols I have a functionality of 3 and a hydroxyl value of 42 mg KOH/g;
• the polyether polyols II have a functionality of 2 and a hydroxyl value of 56-115 mg KOH/g;
• and the composite plant extract is an extract from a mixture of garlic, Chinese pulsatilla root, honeysuckle and sage.