Recycled polyol manufactured from waste polyurethane foam used in LNG refrigerants, and polyurethane foam manufactured using the same.

Abstract

This invention provides a recycled polyol manufactured from polyurethane foam waste and a method for producing the same. [Solution] The recycled polyol has a hydroxyl value (OH value) of 250 mg KOH / g to 1000 mg KOH / g and an amine value of less than 30 mg KOH / g. By applying a titanium catalyst when depolymerizing LNG insulation waste rigid composite polyurethane foam, the recycled polyol can be produced without the step of removing residual catalyst associated with depolymerization using a strong base such as KOH, thereby shortening the process and improving environmental impact.

Claims

1. A recycled polyol manufactured from polyurethane foam waste, The aforementioned regenerated polyol is a regenerated polyol having a hydroxyl value (OH value) of 250 mg KOH / g to 1000 mg KOH / g and an amine value (amine value) of less than 30 mg KOH / g.

2. The recycled polyol according to claim 1, characterized in that the recycled polyol has a viscosity of 200 cps to 30,000 cps.

3. The first step involves adding 50 to 500 parts by weight of polyhydric alcohols and 0.001 to 0.1 parts by weight of titanium-based catalyst to 100 parts by weight of waste rigid composite polyurethane foam for LNG insulation material, and carrying out a depolymerization reaction at 180°C to 250°C. After the first step, a second step is to add 0.001 to 0.01 parts by weight of an antioxidant to stabilize it, After the second step, the glass fibers are removed using a filtration method in the third step, after cooling to below 180°C. A recycled polyol manufactured by a method that includes [the specified component].

4. The recycled polyol according to claim 3, wherein the LNG insulation material rigid composite polyurethane foam waste is one from which glass fibers have been removed.

5. The recycled polyol according to claim 3, characterized in that the polyhydric alcohols are one or more selected from the group consisting of ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, propylene glycol, ester polyol, and ether polyol.

6. The recycled polyol according to claim 3, characterized in that the titanium-based catalyst is at least one selected from the group consisting of TnBT (Tetra n-butyl titanate), TiPT (Tetra isopropyl titanate), and combinations thereof.

7. A polyol premix composition for forming glass fiber reinforced polyurethane foam, comprising a polyol containing the recycled polyol described in any one of claims 1 to 6, a blowing agent, a surfactant, and a reaction catalyst.

8. The polyol premix composition for forming glass fiber reinforced polyurethane foam according to claim 7, wherein the content of the recycled polyol is 5% to 50% by weight of the total weight of the polyol.

9. A glass fiber reinforced polyurethane foam produced by reacting the polyol premix composition for forming glass fiber reinforced polyurethane foam described in claim 7 with an isocyanate.

10. The material contains 7 to 25 parts by weight of glass fiber based on 100 parts by weight of polyol, with a density of 20 to 300 kg / m³. ３ The glass fiber reinforced polyurethane foam according to claim 9, characterized in that it is the glass fiber reinforced polyurethane foam described in claim 9.

11. The glass fiber reinforced polyurethane foam according to claim 9, which is a polyurethane foam for use as a cooling material for LNG tanks.

12. The first step involves adding 50 to 500 parts by weight of polyhydric alcohols and 0.001 to 0.1 parts by weight of titanium-based catalyst to 100 parts by weight of waste rigid composite polyurethane foam for LNG insulation material, and carrying out a depolymerization reaction at 180°C to 250°C. After the first step, a second step is to add 0.001 to 0.01 parts by weight of an antioxidant to stabilize it, After the second step, the glass fibers are removed using a filtration method in the third step, after cooling to below 180°C. A method for producing recycled polyols, including the following.

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