Study On Retardant Industrial Waste And Lignin Modified Polyurethane Rigid Foam

Polyurethane is one of versatile materials. Polyurethane, with very low thermal conductivity, can be used as the main insulation. But at room temperature, limiting oxygen index of pure polyurethane foam is only 17, so it is easy to burn, which can’t meet the requirements. Finding a way to improve flame retardant polyurethane foam method is very urgent. Usually only improving the flame retardancy can be twofold:physical adding and chemical synthesis. Both methods have advantages and disadvantages, simple physical additive flame retardant s operation is easy and suitable for large-scale production and use, but the particle size of the physical flame retardant polyurethane foam will seriously affect the process, and the mechanical properties of foam; chemical reactive flame retardant has effect on LOI and the little impact on the hole bubble, but the complexity of the manufacturing process, will produce large amounts of toxic byproducts. Therefore, finding a combination of both accepting advantages and Rejecting disadvantages is very valuable.In this paper, microencapsulation Industrial ash (MFA) was prepared by in-situ solution polymerization method used polymer as capsule material in front of melamine and formaldehyde. Then polyurethane foam containing different amounts of MFA is prepared. Study influence MFA content on performance of polyurethane foam, including flame retardant properties, thermal properties, mechanical properties, dimensional stability and apparent morphology. It is found that MFA will increase the decomposition temperature of the polyurethane foam and carbon residue, carbon residue amounts to 33.9%, polyurethane foam flame retardant properties and density are also a great help, limiting oxygen index reached 25.6, and significantly improves compression performance of polyurethane foam. Dimensional stability is also very important to the performance of rigid polyurethane foam, smaller size stability of different levels of MFA of rigid polyurethane foam, and no more than 2.5%.Lignin as the matrix, reacting with formaldehyde and diethanolamine is used to prepare lignin amine polyol (LAP). Then the polyphosphate reacts to LAP, obtaining lignin amine phosphate polyol (LAPP). The influence of LAPP content on rigid polyurethane foam properties is probed, such as flame retardant properties, thermal properties, mechanical properties, dimensional stability and apparent morphology. The study finds that phosphorus and nitrogen have synergistic effect, and flame retardant can be improved that the limiting oxygen index is up to 23.1. LAPP improves the compression performance of rigid polyurethane foam, making that the compression strength is about 0.262MPa, elongation at break of 31.2%. As LAPP increases, the apparent morphology of polyurethane foam is apparently improved. With The MFA and LAPP applied to a system, a type of comprehensive applied polyurethane foam is prepared. Comprehensive application of two flame retardants advantage is proved. Not only MFA eliminates easily disadvantage which is destroying the bubble, LAPP also realized environmentally friendly fire. A combination of MFA and LAPP has a great influence on flame retardant of (MFA+LAPP)/RPUF, that 30% of MFA dosage to 30% LAPP modified polyurethane foam limiting oxygen index reaches 27.8.