A kind of melamine foam prepared with blocked isophorone diisocyanate as curing agent

Abstract

The invention relates to melamine foam prepared by taking terminated isophorone diisocyanate as a curing agent. The melamine foam is made from melamine resin prepolymer by taking terminated isophoronediisocyanate as a curing agent. A liquid foaming agent is one of cyclohexane, n-heptane, and isooctane, and the foaming temperature is in a range of 80-120 DEG C. The terminated isophorone diisocyanate takes sodium bisulfite as an end-capping reagent, and has the release temperature being 80-120 DEG C. The released isophorone diisocyanate is taken as a curing agent and can obviously improve the curing rate of the melamine resin prepolymer, thereby matching the curing rate to the foaming rate in the release temperature range. The closed pore rate of melamine foam is no less than 96%, the heatconduction coefficient is lower than 0.029 W / *K, the compression strength is no less than 180 kPa, the oxygen index is no less than 36%, and the density is lower than 50 kg / m<3>.

Description

Technical field [0001] The invention belongs to the technical field of foam materials, and specifically relates to a melamine foam prepared by using blocked isophorone diisocyanate as a curing agent. Background technique [0002] Melamine foam is a thermosetting polymer material, which has good heat resistance, solvent resistance, electrical properties and mechanical strength, and has excellent flame retardant properties such as self-extinguishing from the fire and no dripping during combustion. . These excellent properties of melamine foam make it widely used in various industries and gradually replace other existing foam materials. However, using traditional foaming technology, it is difficult to match the foaming rate and curing rate with each other, resulting in the melamine foam produced with many defects: for example, the cell structure of each part of the melamine foam is not uniform, resulting in each part The performance is uneven; its open cell rate is high, which lea...

AI Technical Summary

Problems solved by technology

However, using traditional foaming technology, it is difficult to match the foaming rate and curing rate, resulting in many defects in the prepared melamine foam: for example, the cell structure of each part of the melamine foam is not uniform, resulting in the Inhomogeneous performance; its high opening rate leads to good thermal conductivity of foam, poor thermal insulation performance, and greatly improves water absorption; insufficient curing rate causes many cells to rupture or collapse, resulting in small compressive strength; foam foam The pores are large, and it is difficult to form a dense protective carbon layer during combustion, and its oxygen index (OI) is generally below 32%.

Generally, in order to reduce costs, a liquid foaming agent is used for foaming, and once the liquid foaming agent reaches the boiling point, its foaming speed is very fast. At this time, it is difficult for the curing rate to match the foaming rate, resulting in the obtained melamine foam having many flaws

If it is difficult to increase the curing rate by blindly increasing the amount of catalyst, it may also cause the initial curing rate to be very fast, and the melamine resin will be cured before the foaming temperature is reached, so that it is impossible to obtain a good performance. Amine Foam