Foam insulation with improved low temperature properties using polyol additives

A method of forming a polyisocyanurate foam product, comprising:

• providing a polyol-containing component, the polyol-containing component comprising a blowing agent, one or more polyester polyols, and at least one hydroxyl-containing low-molecular-weight additive selected from a group consisting of:
• triethanolamine (TEA), trimethylolpropane (TMP), diethyl bis(2-hydroxyethyl)aminomethylphosphonate (DEHAMP), N-methyldiethanolamine (MDEA), 1,4 butanediol (BD), isobutanol, diethylethanolamine (DEEA), and a multi-functional alcohol, wherein the one or more hydroxyl-containing low-molecular weight additives is present in an amount of between 10 parts and 20 parts per 100 parts of the one or more polyester polyols;
• introducing an isocyanate component to the polyol-containing component to form a polyisocyanurate core;
• adding a fire retardant to the polyisocyanurate core;
• and
• coupling a facer with a first surface of the polyisocyanurate core.

A method of forming a polyisocyanurate foam product, comprising:

• providing a polyol-containing component, the polyol-containing component comprising a blowing agent, one or more polyester polyols, and at least one hydroxyl-containing low-molecular-weight additive selected from a group consisting of:
• triethanolamine (TEA), trimethylolpropane (TMP), diethyl bis(2-hydroxyethyl)aminomethylphosphonate (DEHAMP), N-methyldiethanolamine (MDEA), 1,4 butanediol (BD), isobutanol, diethylethanolamine (DEEA), and a multi-functional alcohol, wherein:
• the one or more hydroxyl-containing low-molecular weight additives is present in an amount of between 10 parts and 20 parts per 100 parts of the one or more polyester polyols;
• and
• the polyol-containing component has, before the addition of the blowing agent, a viscosity of less than 3000 centipoise (cps);
• and
• introducing an isocyanate component to the polyol-containing component to form a polyisocyanurate core.