Polyurethane hard foam flame-retardant polyether polyol and preparation method thereof

Abstract

The invention belongs to the field of synthesis of a polyurethane foam material, and particularly relates to polyurethane hard foam flame-retardant polyether polyol. The polyurethane hard foam flame-retardant polyether polyol is prepared from the following raw materials in parts by weight: 20-50 parts of water, 25-30 parts of starch, 8-10 parts of phosphoric acid, 20-40 parts of tetrabromophthalic anhydride, 0.5-1.5 parts of concentrated sulfuric acid and 30-80 parts of epoxypropane. By adopting the polyurethane hard foam flame-retardant polyether polyol, the flame retardant property of the polyurethane hard foam is effectively improved, and the polyurethane hard foam flame-retardant polyether polyol has excellent performances such as permanent flame retardant ability, high strength and low-heat conductivity coefficient. The invention also provides a preparation method of the polyurethane hard foam flame-retardant polyether polyol. The method comprises the following steps: heating water, concentrated sulfuric acid, starch and tetrabromophthalic anhydride until the mixture is transparent after evenly being mixed; adding phosphoric acid; slowly adding epoxypropane after fully mixing under the condition of 120-150 DEG C; vacuumizing for 20-40 minutes at the temperature of 100-120 DEG C after reaction is finished, so as to obtain the polyurethane hard foam flame-retardant polyether polyol. Therefore, the polyurethane hard foam flame-retardant polyether polyol is low in cost, and the preparation method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the field of synthesis of polyurethane foam materials, and in particular relates to a polyurethane rigid foam flame-retardant polyether polyol and a preparation method thereof. Background technique [0002] Rigid polyurethane foam has the advantages of good thermal insulation effect, high strength, weather resistance, and firm bonding. It is widely used in the fields of building exterior wall insulation materials, home appliance insulation materials, and shipbuilding and aviation insulation materials. The existing polyurethane rigid foam flame retardant technology is mostly based on additive flame retardants. When additive flame retardants are used in polyurethane rigid foams, additive flame retardants often migrate to the surface over time and cause precipitation, resulting in polyurethane The flame retardant performance of rigid foam is reduced or even not flame retardant. When the flame-retardant polyether in the prior art ...

AI Technical Summary

Problems solved by technology

The existing polyurethane rigid foam flame retardant technology is mostly based on additive flame retardants. When additive flame retardants are used in polyurethane rigid foams, additive flame retardants often migrate to the surface over time and cause precipitation, resulting in polyurethane The flame retardant performance of rigid foam is reduced or even not flame retardant

When the flame-retardant polyether in the prior art is used in polyurethane rigid foam, it will lead to prolonged foam curing time, large catalyst consumption, foam shrinkage, cracking, heartburn, thermal conductivity and compressive strength and other unstable phenomena.