Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J11/00—Recovery or working-up of waste materials
  • C08J11/04—Recovery or working-up of waste materials of polymers
  • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
  • C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
  • C08J11/22—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds
  • C08J11/24—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing hydroxyl groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
  • C08G18/6415—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63 having nitrogen
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
  • C08J2375/04—Polyurethanes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

• the invention relates to a process for the preparation of polyol-containing dispersions by alcoholysis of
• Liquids are transferable, which can be directly
• reaction-Injection-Molding or R-RIM (Reenforced-Reaction-Injection-Molding) parts based
• the invention is therefore based on the object
• this object is achieved by a
• Process for the preparation of polyol-containing dispersions by reacting polyurethane urea waste with at least one linear and / or branched chain Diol and / or polyol with a molecular weight of 50-1000 g / mol in a weight ratio of polymer waste to diol and / or polyol of over 3: 1, at a temperature of 150-250 ° C, optionally in the presence of acid or
• Reaction product in at least one primary polyol with a molecular weight of up to approx. 6000 g / mol.
• Primary polyol is understood to mean polyols or polyol mixtures which are used for the production of polyurethanes and polyurethane ureas.
• high molecular weight polyols (primary polyols) are dispersible, the dispersions thus obtained having high stability at relatively low viscosities.
• diol or polyol is changed to greater than 3: 1.
• the weight ratio of polymer wastes to diol and / or polyol is preferably above 5: 1. Surprisingly, even with larger ratios of polymer to diol and / or polyol, for example from 6: 1 to 10: 1 and above, no significant occurs Change in the stable disperse: state on, so that the resulting ones
• Primary polyols including high molecular weight, can be diluted without a significant increase in the viscosity of the
• Waste materials and production stands based on urethane or urea mixtures and copolymers are used, which are generally produced by reacting mixtures of polyether and / or polyester polyols and diamines and di- or polyisocyanates.
• the alcoholysis process according to the invention can preferably be carried out on polymers.
• aromatic diamines such as
• Diethyltoluenediamine in combination with high molecular weight polyether polyols with molecular weights of several thousand g / mol, on the one hand, and aromatic di- and polyisocyanates based on methylene diphenyl diisocyanate on the other.
• the alcoholysis is not influenced by other additives and modifiers.
• the RIM or R-RIM parts can be painted as desired and contain fillers or reinforcing materials.
• the method according to the invention is particularly suitable for glass fiber reinforced (R-RIM) parts since
• Viscosities are dispersed; here they sit down
• Alcoholysis product to prevent short glass fibers from settling is therefore of particular importance for the alcoholysis of
• the method according to the invention is therefore the first time managed to break down such waste practically residue-free by alcoholysis and for the original
• the RIM and R-RIM production can be reduced. As already mentioned at the beginning, this was with the previous alcoholysis processes either due to the high hydroxyl equivalents or the heterogeneity of the
• Low molecular weight aliphatic diols with up to 20 carbon atoms are preferably used for the reaction according to the process of the invention.
• these are ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, oligoethylene glycols, propylene glycol, dipropylene glycol, tripropylene glycol, oligopropylene glycol, butanediols, dibutylene glycols, pentanediols,
• Polyol dispersions are formed, provided that the diols and / or polyols are in weight ratios less than 1: 3, preferably less than 1: 5, based on the
• Polyol dispersion is changed in principle.
• Polyol components can be reduced as much as this
• Reaction speed is increased with increasing temperature, also with basic and acidic catalysts.
• the reaction according to the invention is preferably carried out between 180 and 230 ° C. Particularly effective
• Catalysts are alkali alkoxides, hydroxides or
• Carboxylates or Lewis acids such as titanars, stannates or antimonates.
• Reaction conditions leaves the second reaction vessel a product that has the same physical and chemical properties free of unreacted components as a product that was obtained under the same conditions in batch batch operation.
• glass fiber-reinforced (R-RIM) products can also be alcoholized according to this embodiment. Surprisingly, it has been shown that by using this gentle stirred tank method
• the alcoholized polymer wastes are flowable in the heat, but must be used for applications at normal temperatures
• Primary polyols are diluted. Mixtures based on polyether and / or polyester polyols are preferably used as primary polyols. It has proven advantageous to immediately add the primary polyol
• Glass fibers can be found in the form of a compact sediment. Due to the contrary experience with glass fiber filled polyols, this is completely unexpected and is for the practical implementation of the process
• the alcoholysis products produced according to the invention are distinguished by low hydroxyl equivalents. This has the advantage over the alcoholysis polyols - produced by the previous processes - that
• Reaction diol or polyol is an unsaturated carboxylic acid or their anhydride, for example acrylic acid added, reacts with the amines and is incorporated into the polyol dispersion via the double bond. It arises
• Polyol dispersions that are neutral to isocyanate in terms of reactivity. If you mix them e.g. with short-chain, higher-functional polyols, it is possible with these polyol dispersions to produce hard products, in particular rigid polyurethane foams, using conventional formulations. These foams have excellent thermal and mechanical properties. In this way it is possible e.g. RIM or R-RIM old parts
• Bumpers and side panels of automobiles were used, which were produced by the R-RIM process with isocyanates and polyol-diamine mixtures.
• the painted and contaminated parts were roughly crushed in a cutting mill and reacted in this form.
• Polyether triols (primary polyol) are placed in the flask and 150 g of R-RIM waste are metered in at 220 ° C. If it is slow: increase the temperature to 250 ° C, add another 150 g of waste. After a total reaction time of 1.5 hours, the mixture is mixed with 280 g of a long-chain polyether triol (primary polyol) as in Example 1. The result is a disperse, stable liquid with a hydroxyl number of 85 mg KOH / g and a viscosity of 13 Pas at 22o C.
• Example 4
• Apparatus used which consists of two separately heated stirred reactors, each with 4 1 content.
• the second reactor is communicating with the first, so that a corresponding outlet the liquid level in both reactors is kept constant.
• the second reactor also leaves about 4 kg / h of liquid, 230 ° C. hot reaction product, which is collected in a vessel and continuously with a long-chain polyether polyol using a dispenser stirrer in the ratio of

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6411546

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (19)

Citations (3)

Family Cites Families (16)

• 1990
  • 1990-08-02 DE DE19904024601 patent/DE4024601C2/de not_active Expired - Fee Related
• 1991
  • 1991-07-31 US US07/972,464 patent/US5410008A/en not_active Expired - Fee Related
  • 1991-07-31 WO PCT/DE1991/000622 patent/WO1992002576A1/de not_active Ceased
  • 1991-07-31 CA CA 2087718 patent/CA2087718A1/en not_active Abandoned
  • 1991-07-31 EP EP19910914051 patent/EP0542806B1/de not_active Expired - Lifetime
  • 1991-07-31 JP JP51272491A patent/JPH0832796B2/ja not_active Expired - Lifetime
  • 1991-07-31 DE DE59103061T patent/DE59103061D1/de not_active Expired - Fee Related

Patent Citations (3)

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