As well as soles, adhesives, coatings, sealants, etc., foam accounts for the majority, while soft foam in foam accounts for the majority. Soft foam is mainly used in the shockproof of furniture, mattress, lower layer of carpet, car cushion, shockproof packaging, etc. Rigid foam is mainly used for edge bonding, which can be used as building edge bonding laminate, and can be compounded with soft materials such as paper, aluminum foil or hard materials such as aluminum or steel plate; It can also be used for refrigerators, freezers, and other industries, as well as for industrial heat exhaustion; In addition, there are applications in packaging, transportation, and other aspects. RIM products are mainly used in the automotive industry, including instrument panels, safety bars, main panels, and standard windows. They are also used in agricultural equipment, mining equipment, equipment casings, and sports items. Polyurethane casting is mainly used for industrial tires, roller skate wheels, printer rollers, conveyor belts, pumps, etc. Polyurethane recycling methods
The applications of polyurethane include soft foam, hard foam, reaction injection molding (RIM elastomer, casting elastomer.
All soft foam waste can be used in the lower layer of the re bonded carpet. After separation and purification, soft foam is cut into fragments of certain size, and foam fragments are coated with adhesive, The adhesive is a polyurethane with toluene diisocyanate (TDI or diphenylene diisocyanate (MDI and polyether alcohol) as raw materials. The amount is 10% to 20% of the amount of foam added to the catalyst, mixed, placed in the mold for pressing, and heated for pressure curing. According to the different applied pressure, molded products with different densities can be obtained (40100kg/m3 Another way to use foam is to crush the soft foam into a certain size of powder at low temperature, and then mix the powder with polyol. Relative to the amount of polyol, it can reach 15% -20%. The slurry made of polyol and powder can be mixed with isocyanate, and then foam on the foam processing equipment. By controlling the amount of catalyst and isocyanate, a foam with good performance can be obtained, which is comparable to the foam made of raw materials.
In addition, polyurethane can be subjected to alcoholysis, hydrolysis, cracking, etc. to recover polyols and related raw materials. Steam hydrolysis, alcoholysis of binary alcohols, cracking and other methods are available.
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