A kind of phosphating lignin-based flame-retardant reinforced polyurethane rigid foam and preparation method thereof

Abstract

The invention discloses a phosphated lignin-based flame-retardant reinforced polyurethane rigid foam and a preparation method thereof. The polyurethane foam consists of 50-90 parts of bio-based polyols, 10-50 parts of phosphated lignin, and 1-3 parts of amines Catalyst, 0.05-0.2 parts of tin catalyst, 0.5-2 parts of foam stabilizer, 100-140 parts of isocyanate and 4-7 parts of water are prepared by mixing, pouring and foaming. The invention improves the activity of lignin through phosphating modification, promotes the formation of cross-linked network of the polyurethane foam system, improves the mechanical properties of the foam, improves the utilization rate of lignin in the polyurethane foam, and reduces the production cost of the polyurethane foam. In addition, the anhydrous phosphoric acid solution in the modifying liquid is directly used as a flame retardant component and evenly dispersed in the polyurethane foam, which reduces the heat release rate of the polyurethane foam and makes the polyurethane foam have better flame retardancy.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a phosphating lignin-based flame-retardant reinforced polyurethane rigid foam and a preparation method thereof Background technique [0002] With the decrease of non-renewable resources and the continuous deepening of environmental protection problems, the application of natural resources such as plants and natural polymer materials as new chemical raw materials has been paid more and more attention. Lignin is a rich and renewable resource. The industrial lignin produced in the process of pulping and papermaking and plant hydrolysis is discharged as waste, which not only causes a great waste of resources, but also seriously pollutes the environment. [0003] At present, the preparation of polyurethane foam from renewable plant resources has attracted attention. There are a large number of active functional groups such as alcoholic hydroxyl groups, phenolic ...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN101696261A uses separated lignin to modify epoxides to increase the reactivity of lignin, but the modified reaction temperature is high, the conditions are harsh, and the process is complicated

The foam material has excellent mechanical properties and high lignin utilization rate, but the polyurethane foam prepared by the above-mentioned patented method has poor flame retardancy and is flammable in the air, which limits its application range

Although the prior art has disclosed some polyurethane foams prepared by using additive flame retardants, these flame retardants have low reactivity in the polyurethane foam matrix and cannot be polymerized with polyurethane during the foaming process, and are easy to migrate. So that polyurethane foam can not have long-term effective flame retardant properties