Semi-noncombustible building thermal insulation material and manufacturing method thereof

A semi-noncombustible building thermal insulation material, comprising:

• a core layer;
• a sheathing layer provided on one or both sides of the core layer;
• and
• a noncombustible coating layer coated on an opposite side of one side of the sheathing layer in contact with the core layer or between the sheathing layer and the core layer, and having a thickness of 0.1 to 3.0 mm,
• wherein the noncombustible coating layer is made of a noncombustible composition consisting of:
• 11 to 23 parts by weight of aluminum oxide;
• 15 to 21 parts by weight of silicon oxide;
• 19 to 32 parts by weight of sodium silicate;
• 15 to 21 parts by weight of calcium carbonate;
• and
• 15 to 28 parts by weight of water,
• wherein the core layer is made of polyurethane foam and has a density of 15 to 60 kg/m3 and a thickness of 20 to 200 mm,
• wherein the sheathing layer includes one selected from the group consisting of kraft paper, glass fiber mesh, glass fiber fabric, and glass fiber tissue, and
• wherein the noncombustible coating layer is provided as an individual layer distinguished from the core layer and the sheathing layer.