Recovery of polyurethane prepolymer and amine salt

Details Recovery of polyurethane prepolymer and amine salt Recovery of polyurethane prepolymer and amine salt

1975-06-02

1977-07-12

Schain, Howard E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 775AA, 260 775A, 2605676R, C08J 1104

Patent

active

040353141

ABSTRACT:
It is known that polyurethane hydrolyzes in superheated steam.
The oily hydrolyzate from a polyurethane derived from a polyether diol is filtered and stripped to remove the water and remove any unhydrolyzed water-insoluble polymer such as vulcanized rubber, etc. that may be present. There may be a substantial amount of scrap rubber present in the scrap polyurethane that is treated, such as the scrap from a plant producing rubber and plastic products, or scrap articles that may include rubber and polyurethane, such as mats, cushions, automobile parts, solid and pneumatic tires, etc., or scrap which contains old rubber and polyurethane products such as an accululation of scrap rubber tires and polyurethane tires, etc.
The oil produced by the hydrolysis which is essentially a polyether diol (the polyether is nominally difunctional with regard to hydroxyl groups, but may contain minor amounts of material with greater than two functionally) or a mixture of such diols is dissolved in a solvent and the solution is gassed with hydrochloric acid gas which causes amine hydrochloride salts to form, the amine being derived from the amine-cured polyurethane polymer. If precipitate is formed it is removed, as by centrifuging, and excess hydrochloric acid is suitably removed. If the polyurethane has been plasticized with oil, or there is oil present in the rubber (if rubber is present) the oil is dissolved in the polyether diol recovered from the polyurethane. The plasticizer oil may be separated from the polyether diol, as by distillation, or polyether diol/plasticizer mixture may be used, with or without purification, in the production of further polyurethane.

REFERENCES:
patent: 3738946 (1973-06-01), Frulla et al.
Mahoney et al., Environmental Science and Technology, vol. 8, No. 2, Feb. 1974, pp. 135-139.
Strassel et al., Chemical Abstracts, vol. 69:52,748u (1968).
Roberts et al., An Introduction to Modern Experimental Organic Chemistry, Holt, Rinehart and Winston, Inc., N.Y. (1969) pp. 328-333.
Morrison et al., Organic Chemistry, Allyn and Bacon, Inc., Boston (1959) pp. 521, 522.
Adams et al., Laboratory Experiments in Organic Chemistry, Fifth Edition, The MacMillan Co., N.Y. (1963) pp. 105-108.
Brescia, et al., Fundamentals of Chemistry a Modern Introduction, Academic Press, N.Y. (1966) 1st Edition pp. 534-535.

Affiliated with

Also associated with

Rating

Recovery of polyurethane prepolymer and amine salt does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Recovery of polyurethane prepolymer and amine salt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recovery of polyurethane prepolymer and amine salt will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-486940