Method for recycling waste polyurethane

Abstract

The invention relates to a recycling method of a wasted polyurethane material. In the method, the recycled wasted polyurethane after decontamination is cracked; then the cracked particles are fed into a high mixer; then chemical inhibitor, vesicant, thermoplastic styrene-butadiene rubber, polyether or polyester polyol, isocyanate and lubricant are added in turn and uniformly mixed; the uniformly mixed materials are fused, extruded, cooled and pulled into strips by an extruding machine, and then are cut into polyurethane particles by a granulator; the obtained polyurethane particles are injected and shaped by an injection machine or is shaped by the mould pressing of a block press. The invention aims at providing a recycling method of wasted polyurethane which can carry out regulation and control on the density and rigidity of the recycled polyurethane. Compared with the prior art, the recycling method has the advantages of high operating factors on the recycled materials, low production cost, high recycling and utilization value, simple recycling technique, and the like.

Description

technical field [0001] The invention relates to a method for recycling waste polyurethane materials. Background technique [0002] Waste and waste polyurethane materials produced in industrial production and civilian waste polyurethane soles are generally discarded, landfilled or incinerated at will, which not only wastes polyurethane resources, but also pollutes the environment. The currently developed polyurethane recycling technologies are as follows: one is to mix 10-30% of the waste polyurethane pulverized material into polyether polyol (A component) and isocyanate (B component), and foam to prepare foam Products, the difficulty is that the pulverized polyurethane material has to pass through a 100-150 mesh sieve, the particle size of the pulverized polyurethane material is required to be high, and the pulverization is difficult. The second is to crush waste polyurethane and mix it with polyurethane adhesive and urea-aldehyde adhesive, and then mold a plate-like materi...

AI Technical Summary

Problems solved by technology

[0002] Waste and waste polyurethane materials produced in industrial production and civilian waste polyurethane soles are generally discarded, landfilled or incinerated at will, which not only wastes polyurethane resources, but also pollutes the environment

The currently developed polyurethane recycling technologies are as follows: one is to mix 10-30% of the waste polyurethane pulverized material into polyether polyol (A component) and isocyanate (B component), and foam to prepare foam Products, the difficulty is that the pulverized polyurethane material has to pass through a 100-150 mesh sieve, the particle size of the pulverized polyurethane material is required to be high, and the pulverization is difficult

The second is to crush waste polyurethane and mix it with polyurethane adhesive and urea-aldehyde adhesive, and mold a plate-like material with a simple shape, which is only used in low-end products and has low recycling value.

The principle is to break a large number of urethane bonds, ester bonds, urea groups and ether bonds contained in polyurethane macromolecules to form polyester or polyether polyols or polyurethane polyols with relatively small molecular weights. A liquid mixture of alcohol and a small amount of amine, then separated, and then blended into pure polyester polyol and isocyanate components at a ratio of less than 20% to produce polyurethane resin. This method is troublesome for solvent recovery, takes a long time and is low in efficiency , The primary utilization rate of waste is very low