Composition obtained from depolymerization of polyurethane, process of preparing the same and bitumen composition comprising the same
A polyol composition derived from depolymerized polyurethane is used to enhance bitumen compositions by improving rutting resistance, aging resistance, and expanding the temperature range for application, addressing the need for a simple and effective recycling process.
Patent Information
- Application Number
- PCT/CN2024/133228
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-11-21
- Filing Date
- 2024-11-20
- Publication Date
- 2025-05-30
AI Technical Summary
There is a need for a simple and effective process to depolymerize polyurethane (PU) materials, which can produce a polyol composition useful as an additive in bitumen compositions to enhance properties such as rutting resistance, aging resistance, and expand the construction temperature range.
A polyol composition is obtained from the depolymerization of polyurethane-based products, specifically comprising 10 to 50% polyol and 15 to 80% aromatic amine by weight, which is then blended with a base bitumen to create a bitumen composition with improved properties.
The polyol composition effectively improves the rutting resistance, aging resistance, and expands the temperature range for laying bitumen compositions, making it suitable for road pavement materials.
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Figure CN2024133228_30052025_PF_FP_ABST
Abstract
Description
Composition Obtained from Depolymerization of Polyurethane, Process of Preparing the same and Bitumen Composition Comprising the sameTECHNICAL FIELD
[0001] The present invention relates to a polyol composition obtained from depolymerization of a poly-urethane, to the use of the same and to a bitumen composition comprising the same. In addition, the present invention relates to a process of depolymerizing a polyurethane. Preferably, the polyurethane may be a polyurethane waste obtainable from the industry and / or the daily life.BACKGROUND
[0002] Recycling of polyurethane (PU) materials can save raw materials and reduce costs, and is im-portant in the modern industry. As an important approach for the recycling of polyurethane (PU) materials, depolymerization of polyurethane (PU) materials, including hydrolysis, glycolysis and aminolysis, has been studied and developed in the art. In addition, various applications of the product obtained from the depolymerization of polyurethane (PU) materials are developed.
[0003] In addition, a bitumen composition generally comprises additive (s) such as a warm agent to improve the applicability of the bitumen composition, for example to lower the high-temperature viscosity and change the viscosity-temperature curve of the bitumen composition, thus expand-ing the temperature range for applying the bitumen composition.
[0004] There is a need in the art to provide a process of depolymerizing polyurethane (PU) materials, which is simple and is easy to be carried out, wherein the product obtained from the process is useful as an additive in a bitumen composition, which expands the construction temperature range for applying the bitumen composition, and improves properties of the bitumen composi-tion, such as rutting resistance and aging resistance.
[0005] Also, there is a need in the art to provide a composition, which is obtainable from depolymeriz-ing polyurethane (PU) materials, and is useful as an additive in a bitumen composition for ob-taining improved properties, especially as an additive for road pavement materials, for obtaining improved properties such as rutting resistance and aging resistance, and expanded tempera-ture range for laying the bitumen composition.SUMMARY OF THE INVENTION
[0006] It is an objective of the present invention to provide a polyol composition, which is obtainable from recycling of polyurethane (PU) materials, and is useful as an additive in a bitumen compo-sition for obtaining improved properties, especially as an additive in a paving bitumen composi-tion, for obtaining improved properties such as rutting resistance and aging resistance, and ex-panded temperature range for laying the bitumen composition.
[0007] It is another objective of the present invention to provide a process of depolymerizing polyure-thane (PU) materials, which is simple and is easy to be carried out, wherein the product ob-tained therefrom is useful as an additive in a bitumen composition.
[0008] It is another objective of the present invention to provide a bitumen composition, which com-prises the polyol composition of the present invention.
[0009] It is another objective of the present invention to provide a process of preparing the bitumen composition of the present invention, which comprises heating the polyol composition of the present invention, and blending the heated polyol composition into a base bitumen.
[0010] It has been surprisingly found that the above objectives can be achieved by following embodi-ments:
[0011] 1. A polyol composition obtained from depolymerization of a polyurethane-based product, which comprises, based on a total weight of the polyol composition:
[0012] 10 to 50 %, preferably 25 to 45 %by weight of a polyol as component (A) ; and
[0013] 15 to 80 %, preferably 20 to 70 %by weight of an amine as component (B) , wherein com-ponent (B) comprises an aromatic amine.
[0014] 2. The polyol composition according to embodiment 1, wherein component (B) is consisting of the aromatic amine.
[0015] 3. The polyol composition according to embodiment 1 or 2, wherein the polyurethane has a pol-yol moiety, and the polyol moiety is a polyester polyol moiety and / or a polyether polyol moiety, preferably a poly (oxyalkylene) polyol moiety with the oxyalkylene having 2 to 4 carbon atoms, more preferably a poly (oxyalkylene) polyol moiety comprising at least one unit selected from oxyethylene, oxypropylene, oxybutylene, and oxytetramethylene.
[0016] 4. The polyol composition according to any one of embodiments 1 to 3, wherein component (A) comprises component (A1) derived from poly (oxyethylene) polyol moiety of the polyurethane and component (A2) derived from poly (oxypropylene) polyol moiety of the polyurethane, prefer-ably the molar ratio of component (A1) to component (A2) is in the range from 0: 1 to 5: 1, more preferably 0.1: 1 to 4: 1.
[0017] 5. The polyol composition according to any one of embodiments 1 to 4, wherein the aromatic amine comprises an aromatic polyamine, such as diamine and polymeric forms thereof, prefer-ably polymeric diphenylmethylene diamine, diphenylmethylene diamine, toluene diamine, phe-nylene diamine, naphthalene diamine, tetrahydronaphthalene diamine, biphenylene diamine, dimethyl biphenylene diamine, or any combination thereof, more preferably diphenylmethylene diamine and toluene diamine.
[0018] 6. The polyol composition according to any one of embodiments 1 to 5, wherein the aromatic amine comprises 2, 4-toluene diamine, 2, 6-toluene diamine, 4, 4′-diphenylmethane diamine and / or 2, 4′-diphenylmethane diamine, preferably the aromatic amine comprises 4, 4′-diphenylmethane diamine and 2, 4′-diphenylmethane diamine with the molar ratio of 2, 4′-diphenylmethane diamine to 4, 4′-diphenylmethane diamine in the range from 0: 1 to 1: 1, prefer-ably 0.1: 1 to 0.5: 1.
[0019] 7. The polyol composition according to any one of embodiments 1 to 6, wherein the polyol composition further comprises:
[0020] styrene-based polymer, preferably styrene-acrylonitrile copolymer, preferably in an amount of 0 to 50 %, preferably from 3 to 45%by weight, based on the total weight of the polyol compo-sition.
[0021] 8. The polyol composition according to any one of embodiments 1 to 7, wherein the polyol composition further comprises a glycol (C) which is not component (A) , preferably diethylene glycol, in a content of 0 to 8 %by weight, preferably 0 to 4 %by weight, based on the total weight of the polyol composition.
[0022] 9. The polyol composition according to any one of embodiments 1 to 8, which is obtained from the depolymerization of a polyurethane foam, preferably a flexible polyurethane foam.
[0023] 10. The polyol composition according to any one of embodiments 1 to 9, which is obtained by depolymerizing the polyurethane-based product to form a depolymerized product system, and distilling the depolymerized product system at a temperature of 160-240℃ and at a pressure of 10 to 100 mbar.
[0024] 11. A process of producing the polyol composition of any one of embodiments 1 to 10, compris-ing:
[0025] (1) depolymerizing a polyurethane-based product by a depolymerizing agent to form a de-polymerized product system, and
[0026] (2) distilling the depolymerized product system obtained from step (1) , to obtain the polyol composition.
[0027] 12. The process of embodiment 11, wherein the depolymerizing agent is selected from: water; a compound having OH number of at least 300 mgKOH / g, preferably C1-C20-diols, C1-C20-triols, C1-C20-amines, or C1-C20-alkanolamines, more preferably ethylene glycol, diethylene glycol, triethylene glycol, PEG 300-600, propylene glycol, dipropylene glycol, diethanolamine, triethan-olamine, or glycerin; a compound having amine value of at least 300 mgKOH / g, preferably am-monia, C1-C20-alkylenediamine, more preferably ammonia, ethylenediamine, propylene diamine, butanediamine; or any combination thereof.
[0028] 13. The process of embodiment 11 or 12, wherein in step (1) , the ratio by weight of the polyure-thane-based product to be depolymerized to the depolymerizing agent is 3: 1 to 1: 2, preferably 3: 1 to 1: 1.
[0029] 14. The process of any one of embodiments 11 to 13, wherein step (2) is carried out at a tem-perature of 160-240℃ and at a pressure of 10 to 100 mbar.
[0030] 15. The process of any one of embodiments 11 to 14, wherein the polyol composition is ob-tained from the distillation residue.
[0031] 16. A bitumen composition, comprising:
[0032] (a) a base bitumen; and
[0033] (b) a polyol composition of any one of embodiments 1 to 10 or prepared by the process of any one of embodiments 11 to 15.
[0034] 17. the bitumen composition of embodiment 16, wherein
[0035] the amount of the base bitumen is in the range from 60 to 95%by weight, preferably 70 to 95%by weight, more preferably 80 to 95%by weight, based on the total weight of the bitumen composition;
[0036] the amount of the polyol composition is in the range from 5 to 25%by weight, preferably 5 to 20%by weight, more preferably 5 to 15%by weight, based on the total weight of the bitumen composition.
[0037] 18. A process of producing the bitumen composition of any one of embodiments 16 to 17, com-prising:
[0038] (1-i) heating the polyol composition of any one of embodiments 1 to 10 or prepared by the process of any one of embodiments 11 to 15 at a temperature in the range from about 100℃ to about 200℃, such as 150℃, and
[0039] (1-ii) blending the heated polyol composition with a base bitumen under a process tempera-ture in the range from about 100℃ to about 200℃, such as about 130℃ to about 165℃, pref-erably140℃ to about 160℃, to get the bitumen composition.
[0040] 19. The process of embodiment 18, further comprising grinding the polyol composition before step (1-i) .
[0041] 20. A process of producing the bitumen composition of any one of embodiments 16 to 17, com-prising:
[0042] (2-i) heating a base bitumen up to a temperature in the range from about 100℃ to about 200℃, such as 130℃ to about 150℃, and
[0043] (2-ii) mixing the heated base bitumen with the polyol composition of the present invention with a shear rate in the range from such as 1000 to 4000 rpm, preferably 2000 rpm, at a tem-perature in the range from about 100℃ to about 200℃, such as 130℃ to about 150℃, for a period of time in the range from about 5min to 3 hours.
[0044] The polyol composition of the present invention is useful as an additive in a bitumen composi-tion. It improves the properties of the bitumen composition in a cost-effective way. In particular, the polyol composition of the present invention is useful as a novel warm agent in a bitumen composition, especially in a paving bitumen composition, to expand the temperature range for laying the bitumen composition, at the same time maintain or optimize the properties of bitumen, such as improving rutting resistance and aging resistance, and decreasing operation tempera-ture for laying the bitumen composition, which is desirable for applications such as road / bridge pavement.
[0045] In addition, the polyol composition of the present invention is obtainable by the process of the present invention. The process of the present invention is simple and is easy to be carried out, provides an effective and sustainable solution for the recycling of wasted / end-of-life polyure-thane materials, especially polyether polyol-based polyurethane materials, such as polyether polyol-based polyurethane flexible foam materials, and achieves a mass balance solution for the carbon emission footprint.
[0046] DESCRIPTION OF THE DRAWINGS
[0047] Figure 1 shows the curves in RAI test.DETAILED DESCRIPTION OF THE INVENTION
[0048] Unless defined otherwise, all technical and scientific terms used herein have the meaning commonly understood by a person skilled in the art to which the invention belongs. As used herein, the following terms have the meanings ascribed to them below, unless specified other-wise.
[0049] The articles “a” , “an” and “the” mean one or more of the species designated by the term follow-ing said article.
[0050] In the context of the present disclosure, any specific values mentioned for a feature (comprising the specific values mentioned in a range as the end point) can be recombined to form a new range.
[0051] Further embodiments of the present invention are discernible from the claims, the description, and the examples. It will be understood that the aforementioned and hereinbelow still to be elu-cidated features of the subject matter of the present invention are utilizable not only in the par-ticular combination indicated, but also in other combinations without leaving the realm of the present invention.
[0052] Polyol composition
[0053] One aspect of the present invention relates to a polyol composition obtained from depolymeriza-tion of a polyurethane-based product, which comprises, based on a total weight of the polyol composition:
[0054] 10 to 50 %, preferably 25 to 45 %by weight of a polyol as component (A) ; and
[0055] 15 to 80 %, preferably 20 to 70 %by weight of an amine as component (B) , wherein com-ponent (B) comprises an aromatic amine.
[0056] The polyol composition of the present invention is obtained from depolymerization of a polyure-thane-based product, wherein the polyurethane comprises a polyol moiety derived from a polyol for forming the polyurethane and an isocyanate moiety derived from an isocyanate for forming the polyurethane. The polyurethane may be in form of a polyurethane foam, preferably a flexible polyurethane foam. Preferably, the polyurethane may comprise a polyurethane waste, such as those obtainable from the industry or from people's daily life.
[0057] Polyol component (A)
[0058] Polyol component (A) of the present invention is obtained from depolymerization of a polyure-thane-based product. Preferably, polyol component (A) is a polyol derived from a polyol moiety of the polyurethane.
[0059] In an embodiment, the polyol as component (A) is a polymeric polyol.
[0060] The polyol moiety of the polyurethane is derived from a polyol for forming the polyurethane. As the polyol for forming the polyurethane, compounds generally known as isocyanate reactive compounds can be used. In particular, the polyol for forming the polyurethane may be selected from the group consisting of polyester polyols, polyether polyols, and any mixture thereof.
[0061] The polyester polyols may be prepared by condensation of polyfunctional alcohols having from 2 to 12 carbon atoms with polyfunctional carboxylic acids having from 2 to 12 carbon atoms.
[0062] The polyfunctional alcohols or polyfunctional carboxylic acids may have a functionality of around 2. The examples of the polyfunctional alcohols may be ethylene glycol, diethylene glycol, bu-tanediol, or a combination thereof. The examples of the polyfunctional carboxylic acids may be succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, sebacic acid, decanedicar-boxylic acid, maleic acid, fumaric acid, phthalic acid, isophthalic acid, terephthalic acid, the iso-mers of naphthalenedicarboxylic acids, or the ester or anhydrides of the acids mentioned.
[0063] In a preferred embodiment of the invention, the polyol for forming the polyurethane is polyether polyols.
[0064] The polyether polyols may be obtained by known methods, for example by polymerization of alkylene oxides with addition of at least one starter molecule which comprises from 2 to 8, pref-erably from 2 to 6, reactive hydrogen atoms in the presence of a catalyst. As the catalyst, it is possible to use alkali metal hydroxides such as sodium or potassium hydroxide or alkali metal alkoxides such as sodium methoxide, sodium or potassium ethoxide or potassium isopropoxide or, in the case of cationic polymerization, Lewis acids such as antimony pentachloride, boron trifluoride etherate or bleaching earth as the catalyst. Furthermore, double metal cyanide com-pounds, known as DMC catalysts, can also be used as the catalyst.
[0065] As the alkylene oxide, preference is given to using one or more compounds having from 2 to 4 carbon atoms in the alkylene radical, e.g., ethylene oxide, 1, 3-propylene oxide, tetrahydrofuran, 1, 2-or 2, 3-butylene oxide, in each case either alone or in the form of mixtures, and preferably ethylene oxide, 1, 2-propylene oxide and / or tetrahydrofuran, most preferably tetrahydrofuran.
[0066] Possible starter molecules are, for example, ethylene glycol, diethylene glycol, glycerol, trime-thylolpropane, pentaerythritol, sugar derivatives such as sucrose, sugar alcohol such as sorbitol, methylamine, ethylamine, isopropylamine, butylamine, benzylamine, aniline, toluidine, toluene-diamine, naphthylamine, ethylenediamine, diethylenetriamine, 4, 4'-methylenedianiline, 1, 3-propanediamine, 1, 6-hexanediamine, ethanolamine, diethanolamine, triethanolamine and other dihydric or polyhydric alcohols or monofunctional or polyfunctional amines.
[0067] Examples of polyether polyols can also include a ring-opening polymer of tetrahydrofuran (poly-tetramethylene glycol, PTMEG) , natural oil-based polyether polyols like alkoxylated castor oil or other polyether polyols based on natural oils or fats, e.g., those obtained by ring opening reac-tion of epoxidized unsaturated vegetable oils, polyether polyols based on saccharides.
[0068] In a preferred embodiment of the present invention, the polyol moiety of the polyurethane is a poly (oxyalkylene) polyol moiety, such as a poly (oxyalkylene) polyol moiety with the oxyalkylene having 2 to 4 carbon atoms, more preferably a poly (oxyalkylene) polyol moiety comprising at least one unit selected from oxyethylene, oxypropylene, oxybutylene, and oxytetramethylene. Preferably, in the present invention, the polyol moiety of the polyurethane has a number aver- age molecular weight in the range from 500 to 10,000 g / mol, such as 800 g / mol, 1,000 g / mol, 2,000 g / mol, 3,000 g / mol, 4,000 g / mol, 5,000 g / mol, 6,000 g / mol, 7,000 g / mol, 8,000 g / mol, 9,000 g / mol, 10,000 g / mol, of any number average molecular weight between these values, preferably in the range from 1,000 to 8,000 g / mol and more preferably in the range from 2,000 to 8,000 g / mol. In this context, the alkylene (for example the alkylene in oxyalkylene) can com-prise 2 to 10, or 2 to 8, or 2 to 6, or 2, 3, or 4 carbon atoms.
[0069] In a preferred embodiment of the present invention, polyol component (A) comprises polyol component (A1) derived from poly (oxyethylene) polyol moiety of the polyurethane and polyol component (A2) derived from poly (oxypropylene) polyol moiety of the polyurethane, preferably the molar ratio of polyol component (A1) to polyol component (A2) is in the range from 0: 1 to 5: 1, for example 0.05: 1, or 0.1: 1, or 0.2: 1, or 0.4: 1, or 0.6: 1, or 0.8: 1, or 1: 1, or 1.2: 1, or 1.4: 1, or 1.6: 1, or 1.8: 1, or 2.0: 1, or 2.2: 1, or 2.4: 1, or 2.6: 1, or 2.8: 1, or 3.0: 1, or 3.2: 1, or 3.4: 1, or 3.6: 1, or 3.8: 1, or 4: 1, or 4.3: 1, or 4.6: 1, or 4.8: 1, or is of any molar ratio between these values, such as from 0.051: 1 to 5: 1, preferably from 0.1: 1 to 5: 1, more preferably from 0.1: 1 to 4: 1, such as 0.1: 1 to 3: 1, or 0.1: 1 to 1: 1.
[0070] Preferably, polyol component (A) of the present invention is a bifunctional or polyfunctional pol-yol component. For example, the hydroxy functionality of polyol component (A) is equal to or more than 2, such as 3 or more, 4 or more, 5 or more, 6 or more, 7 or more, 8 or more, 9 or more, 10 or more. In a preferred embodiment, the hydroxy functionality of polyol component (A) may be in a range of 2 to 10, such as 2 to 6.
[0071] The amount of polyol component (A) can be in the range from 10 to 50%by weight, for example 10%by weight, 12%by weight, 15%by weight, 18%by weight, 20%by weight, 23%by weight, 25%by weight, 27%by weight, 30%by weight, 32%by weight, 35%by weight, 38%by weight, 40%by weight, 42%by weight, 45%by weight, 48%by weight, 50%by weight, or can be of any amount between these values, such as from 15 to 50%by weight, preferably from 20 to 50%by weight, more preferably from 25 to 45%by weight, based on the weight of the polyol composi-tion of the present invention.
[0072] Amine component (B)
[0073] Amine component (B) is obtained from depolymerization of a polyurethane-based product. In the present invention, amine component (B) comprises an aromatic amine.
[0074] Preferably, amine component (B) is an amine derived from an isocyanate moiety of the polyure-thane. The isocyanate moiety of the polyurethane is derived from an isocyanate for forming the polyurethane.
[0075] The isocyanate for forming the polyurethane may be selected from a group consisting of any organic compound having two or more isocyanate groups per molecule, such as diisocyanate, including not only those in which the isocyanate groups are attached to a hydrocarbon radical but also those in which the isocyanate groups are attached to a radical including a heteroatom such as oxygen or nitrogen, for example as part of ester groups, ether groups, and the like, as well as combinations of these.
[0076] The isocyanate for forming the polyurethane may be aliphatic, araliphatic, cycloaliphatic or aro-matic polyisocyanate, such as an aliphatic diisocyanate, or araliphatic diisocyanate, or cycloali- phatic diisocyanate, or aromatic diisocyanate, comprising isocyanate monomers and / or isocya-nate prepolymers.
[0077] Isocyanate prepolymers suitable for the present invention may be obtainable by reacting the NCO functional groups of the isocyanate component with an active hydrogen-containing materi-al, for example at a temperature of from 30 to 200℃, preferably at about 50-180℃, to give an isocyanate-terminated prepolymer having two or more free isocyanate groups. For example, isocyanate prepolymers suitable for the present invention comprise a diisocyanate oligomer produced by the reaction of at least one diisocyanate monomer with at least one diol or diamine. The diisocyanate monomer may be selected from those listed above.
[0078] In some embodiments, the active hydrogen-containing material may be selected from a group consisting of polyester diols, polyether diols, polycarbonate diols, and diamines. In some em-bodiments, the active hydrogen-containing material is polyether diols. In some embodiments, the active hydrogen-containing material is polyester diols. In some embodiments, the active hydrogen-containing material is a mixture of one or more polyester diols and one or more poly-ether diols.
[0079] For example, isocyanate prepolymers suitable for the present invention may be diisocyanate prepolymer based on polyester diols, diisocyanate prepolymer based on polyether diols, diiso-cyanate prepolymer based on polycarbonate diols, and diisocyanate prepolymer based on dia-mines.
[0080] Polyester diols preferably comprise alternating acid and alcohol units. As acid components, preference is given to using succinic acid, adipic acid, phthalic anhydride, phthalic acid or mix-tures of the acids and / or anhydrides mentioned. Alcohol components used may be ethanediol, 1, 2-propanediol, 1, 3-propanediol, 1-4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, diethylene glycol, dipropylene glycol or mixtures of the alcohols mentioned.
[0081] As polyether diols, preference is given to polyether diols which are made up of repeating eth-ylene oxide and propylene oxide units, preferably with a proportion of propylene oxide units of from 35 to 100%by mole, particularly preferably with a proportion of propylene oxide units of from 50 to 100%by mole. These can be random copolymers, gradated copolymers, alternating copolymers or block copolymers of ethylene oxide and propylene oxide. Suitable polyether diols may also be polytetrahydrofuran diol.
[0082] Suitable polycarbonate diols may include products obtained by reacting diols such as 1, 3-propanediol, 1, 4-butanediol, 1, 6-hexanediol, diethylene glycol or tetraethylene glycol with diaryl carbonates, e.g., diphenyl carbonate, or with phosgene.
[0083] Suitable diamines are such as diaminoethane, diaminopropanes, diaminobutanes, diaminohex-anes, piperazine, 2, 5-dimethylpiperazine, amino-3-aminomethyl-3, 5, 5-trimethylcyclohexane (isophoronediamine, IPDA) , 4, 4′-diaminodicyclohexyl-methane, 1, 4-diaminocyclohexane, ami-noethylethanolamine, hydrazine, hydrazine hydrate.
[0084] Polyurethane prepolymers having two or more free isocyanate groups, polyurea prepolymers having two or more free isocyanate groups, and the combination thereof, may also be used as the isocyanate suitable for the present invention.
[0085] In the present invention, the isocyanate for forming the polyurethane comprises an aromatic isocyanate. In a preferred embodiment of the present invention, the isocyanate for forming the polyurethane is an aromatic isocyanate.
[0086] The aromatic isocyanate for forming the polyurethane may correspond to the formula R′ (NCO) z wherein R′is aromatic and z is an integer that corresponds to the valence of R′. Typically, z is at least two. Suitable examples of aromatic isocyanates include, but are not limited to, tetra-methylxylylene diisocyanate (TMXDI) , 1, 4-diisocyanatobenzene, 1, 3-diisocyanato-o-xylene, 1, 3-diisocyanato-p-xylene, 1, 3-diisocyanato-m-xylene, 2, 4-diisocyanato-1-chlorobenzene, 2, 4-diisocyanato-1-nitro-benzene, 2, 5-diisocyanato-1-nitrobenzene, m-phenylene diisocyanate, p-phenylene diisocyanate, 2, 4-toluene diisocyanate, 2, 6-toluene diisocyanate, mixtures of 2, 4-and 2, 6-toluene diisocyanate, 1, 5-naphthalene diisocyanate, 1-methoxy-2, 4-phenylene diisocy-anate, 4, 4′-diphenylmethane diisocyanate, 2, 4′-diphenylmethane diisocyanate, 4, 4′-biphenylene diisocyanate, 3, 3′-dimethyl-4, 4′-diphenylmethane diisocyanate, 3, 3′-dimethyldiphenylmethane-4, 4′-diisocyanate, triisocyanates such as 4, 4′, 4″-triphenylmethane triisocyanate and 2, 4, 6-toluene triisocyanate, tetraisocyanates such as 4, 4′-dimethyl-2, 2′-5, 5′-diphenylmethane tetrai-socyanate, toluene diisocyanate, 2, 2′-diphenylmethane diisocyanate, 2, 4′-diphenylmethane diisocyanate, 4, 4′-diphenylmethane diisocyanate (4, 4′-methylenediphenyl isocyanate) , polymethylene polyphenylene polyisocyanate, corresponding isomeric mixtures thereof, and combinations thereof. Alternatively, the aromatic isocyanate may be or include a triisocyanate product of m-TMXDI and 1, 1, 1-trimethylolpropane, a reaction product of toluene diisocyanate and 1, 1, 1-trimethyolpropane, and combinations thereof. In one embodiment, the isocyanate for forming the polyurethane is or includes a diisocyanate selected from the group of methylene diphenyl diisocyanates, toluene diisocyanates, hexamethylene diisocyanates, H12MDIs, and combinations thereof.
[0087] In a preferred embodiment of the present invention, amine component (B) of the polyol compo-sition comprises or is an aromatic polyamine, such as diamine and polymeric forms thereof, preferably polymeric diphenylmethylene diamine, diphenylmethylene diamine, toluene diamine, phenylene diamine, naphthalene diamine, tetrahydronaphthalene diamine, biphenylene diamine, dimethyl biphenylene diamine, or any combination thereof, more preferably diphenylmethylene diamine and toluene diamine.
[0088] Preferably, amine component (B) of the polyol composition comprises or is an aromatic amine. Preferably, the aromatic amine comprises 2, 4-toluene diamine, 2, 6-toluene diamine, 4, 4′-diphenylmethane diamine and / or 2, 4′-diphenylmethane diamine, preferably amine component (B) comprises 4, 4′-diphenylmethane diamine and 2, 4′-diphenylmethane diamine with the molar ratio of 2, 4′-diphenylmethane diamine to 4, 4′-diphenylmethane diamine in the range from 0: 1 to 1: 1, for example 0.1: 1, or 0.2: 1, or 0.3: 1, or 0.4: 1, or 0.5: 1, or 0.6: 1, or 0.7: 1, or 0.8: 1, or 0.9: 1, or 1: 1, or of any molar ratio between these values, such as from 0.1: 1 to 0.8: 1, preferably from 0.1: 1 to 0.6: 1, more preferably from 0.1: 1 to 0.5: 1.
[0089] Preferably, amine component (B) of the present invention is a bifunctional or polyfunctional amine component. For example, the amine functionality of amine component (B) is equal to or more than 2, such as 3 or more, 4 or more, 5 or more. In a preferred embodiment, the amine functionality of amine component (B) may be in a range of 2 to 10, such as 2 to 6, or 2 to 4.
[0090] The amount of amine component (B) of the present invention can be in the range from 15 to 80%by weight, for example 15%by weight, 18%by weight, 20%by weight, 24%by weight, 28%by weight, 30%by weight, 32%by weight, 35%by weight, 38%by weight, 40%by weight, 42%by weight, 45%by weight, 48%by weight, 50%by weight, 53%by weight, 55%by weight, 57%by weight, 60%by weight, 62%by weight, 65%by weight, 68%by weight, 70%by weight, 72%by weight, 75%by weight, 78%by weight, 80%by weight, or can be of any amount be-tween these values, such as from 20 to 70%by weight, preferably from 20 to 50%by weight, more preferably from 25 to 45%by weight, based on the weight of the polyol composition of the present invention.
[0091] Other components
[0092] Optionally, the polyol composition of the present invention may further comprise other compo-nent (s) . Preferably, the polyol composition of the present invention may further comprise sty-rene-based polymer and / or glycol.
[0093] Styrene-based polymer is understood here to include all homo-or copolymers which result from polymerization of styrene and / or derivatives of styrene. Derivatives of styrene are, for example, alkylstyrenes such as alpha-methylstyrene, ortho-, meta-, para-methylstyrene, para-butylstyrene, especially para-tert-butylstyrene, alkoxystyrene such as para-methoxystyrene, para-butoxystyrene, para-tert-butoxystyrene.
[0094] In general, suitable styrene-based polymers have a Mn of 10,000 to 1,000,000 g / mol (deter-mined by GPC) , preferably 20,000 to 750,000 g / mol, more preferably 30,000 to 500,000 g / mol.
[0095] In a preferred embodiment, the styrene-based polymer in the polyol composition of the present invention may consist essentially or completely of a homopolymer of styrene or styrene deriva-tives.
[0096] In a further preferred embodiment of the invention, the styrene-based polymer in the polyol composition of the present invention may consist essentially or completely of a styrene copoly-mer which is likewise considered to be a styrene-based polymer in the context of this applica-tion. Styrene copolymers may comprise, for example, butadiene, acrylonitrile, maleic anhydride, vinylcarbazole, or esters of acrylic acid, methacrylic acid or itaconic acid, as comonomers. Suit-able styrene copolymers comprise generally at least 20%by weight of styrene, preferably at least 40%and more preferably at least 60%by weight of styrene. In another embodiment, they comprise at least 90%by weight of styrene. Preferred styrene copolymers are styrene-acrylonitrile copolymers (SAN) and acrylonitrile-butadiene-styrene copolymers (ABS) , styrene-1, 1′-diphenylethene copolymers, acrylic ester-styrene-acrylonitrile copolymers (ASA) , methyl methacrylate-acrylonitrile-butadiene-styrene copolymers (MABS) .
[0097] A further preferred styrene-based polymer is styrene-acrylonitrile copolymers (SAN) preferably with a molar ratio of styrene monomeric unit to acrylonitrile monomeric unit in the range from 4: 1 to 1: 1, for example 4: 1, or 3: 1, or 2: 1, or 1: 1, or of any molar ratio between these values.
[0098] The styrene homo-or copolymers can be prepared, for example, by free-radical polymerization, cationic polymerization, anionic polymerization, or under the influence of organometallic cata-lysts (for example Ziegler-Natta catalysis) . This can lead to isotactic, syndiotactic, atac-tic styrene-based polymers or copolymers. They are preferably prepared by free-radical polymerization. The polymerization can be performed as a suspension polymerization, emulsion polymerization, solution polymerization or bulk polymerization.
[0099] The preparation of suitable styrene-based polymers is described, for example, in Oscar Nuyken, Polystyrenes and Other Aromatic Polyvinyl Compounds, in Kricheldorf, Nuyken, Swift, N. Y. 2005, p. 73-150 and literature cited therein; and in Elias, Macromolecules, Weinheim 2007, p. 269-275.
[0100] The amount of styrene-based polymer in the polyol composition of the present invention can be in the range from 0 to 50 %by weight, for example 2%by weight, 4%by weight, 6%by weight, 8%by weight, 10%by weight, 15%by weight, 20%by weight, 22%by weight, 25%by weight, 28%by weight, 30%by weight, 33%by weight, 35%by weight, 37%by weight, 40%by weight, 42%by weight, 45%by weight, 48%by weight, 50%by weight, or can be of any amount be-tween these values, such as from 0 to 45%by weight, preferably from 3 to 45%by weight, based on the weight of the polyol composition of the present invention.
[0101] The polyol composition of the present invention may further comprise glycol (C) which is not component (A) of the polyol composition of the present invention. For example, it may be unre-acted glycolysis agent. The glycol (C) can comprise 2 to 10, 2 to 8, 2 to 6, 2 to 4 or 2, 3, or 4 carbon atoms. Preferred examples of glycol (C) include but are not limited to ethylene glycol, diethylene glycol, triethylene glycol, 1, 2-propylene glycol, 1, 3-propylene glycol, 1, 1-dimethyl-1, 2-ethanediol, dipropylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, tripropylene glycol, 1, 4-butanediol, 1, 5-pentanediol, neopentyl glycol, 1, 6-hexanediol, 2-methyl-1, 5-pentanediol, 2-ethyl-1, 4-butanediol, and 1, 4-dimethylol-cyclohexane. Preferably, the glycol (C) contained in the polyol composition of the present invention is diethylene glycol.
[0102] The amount of glycol (C) in the polyol composition of the present invention can be in the range from 0 to 8 %by weight, for example 0.01%by weight, 0.03%by weight, 0.05%by weight, 1%by weight, 2%by weight, 3%by weight, 4%by weight, 5%by weight, 6%by weight, 7%by weight, 8%by weight, or can be of any amount between these values, such as from 0 to 6%by weight, preferably from 0 to 4%by weight, based on the weight of the polyol composition of the present invention.
[0103] Preferred embodiments of the polyol composition
[0104] The polyol composition of the present invention preferably is obtained from the depolymeriza-tion of a polyurethane foam, preferably a polyether polyol-based polyurethane foam, more pref-erably a flexible polyether polyol-based polyurethane foam. Preferably, these polyurethane and polyurethane foam may be waste or end-of-life polyurethane materials.
[0105] Preferably, the polyol composition of the present invention has a hydroxyl number (OH number) in the range from 10 to 1000 mg KOH / g, for example 15 mg KOH / g, 20 mg KOH / g, 30 mg KOH / g, 40 mg KOH / g, 50 mg KOH / g, 60 mg KOH / g, 70 mg KOH / g, 80 mg KOH / g, 90 mg KOH / g, 100 mg KOH / g, 120 mg KOH / g, 150 mg KOH / g, 170 mg KOH / g, 190 mg KOH / g, 200 mg KOH / g, 210 mg KOH / g, 230 mg KOH / g, 300 mg KOH / g, 500 mg KOH / g, 800 mg KOH / g, 900 mg KOH / g, 1,000 mg KOH / g, or has any OH number between these values, preferably in the range from 50 to 900 mg KOH / g, or in the range from 100 to 900 mg KOH / g, or in the range from 150 to 850 mg KOH / g, in the range from 200 to 850 mg KOH / g, in the range from 200 to 800 mg KOH / g. The OH number can be measured according to the method provided in exam-ples.
[0106] Preferably, the polyol composition of the present invention has a number average molecular weight in the range from 100 to 1500 g / mol, for example 100 g / mol, 200 g / mol, 300 g / mol, 400 g / mol, 500 g / mol, 600 g / mol, 700 g / mol, 800 g / mol, 900 g / mol, 1000 g / mol, 1100 g / mol, 1200 g / mol, 1300 g / mol, 1400 g / mol, 1500g / mol, or has any number average molecular weight be-tween these values, preferably in the range from 120-1000 g / mol, more preferably in the range from 220-800 g / mol. The molecular weight can be measured according to the method provided in examples.
[0107] Preferably, the polyol composition of the present invention has a polymer dispersity index (PDI) in the range from 3.0 to 6.0, more preferably in the range from 4.0 to 5.0. PDI can be measured according to the method provided in examples.
[0108] In one embodiment, the polyol composition of the present invention comprises:
[0109] 10 to 50 %by weight of a polyol as component (A) ; and
[0110] 15 to 80 %by weight of an amine as component (B) ,
[0111] optionally 3 to 45%%by weight of styrene-based polymer, preferably styrene-acrylonitrile copolymer,
[0112] optionally 0.01 to 6 %by weight of glycol (C) , preferably diethylene glycol,
[0113] based on a total weight of the polyol composition,
[0114] wherein the polyurethane has a polyol moiety, and the polyol moiety is a polyether polyol moiety, preferably a poly (oxyalkylene) polyol moiety, more preferably a poly (oxyalkylene) polyol moiety comprising at least one unit selected from oxyethylene, oxypropylene, oxybutylene, and oxytet-ramethylene,
[0115] wherein the polyurethane has an isocyanate moiety and the isocyanate moiety is an aromatic isocyanate moiety.
[0116] In one embodiment, the polyol composition of the present invention comprises:
[0117] 25 to 45 %by weight of a polyol as component (A) ; and
[0118] 20 to 70 %by weight of an amine as component (B) ,
[0119] optionally 3 to 45%%by weight of styrene-based polymer, preferably styrene-acrylonitrile copolymer,
[0120] optionally 0.01 to 6 %by weight of glycol (C) , preferably diethylene glycol,
[0121] based on a total weight of the polyol composition,
[0122] wherein the polyurethane has a polyol moiety, and the polyol moiety is a polyether polyol moiety, preferably a poly (oxyalkylene) polyol moiety, more preferably a poly (oxyalkylene) polyol moiety comprising at least one unit selected from oxyethylene, oxypropylene, oxybutylene, and oxytet-ramethylene,
[0123] wherein the polyurethane has an isocyanate moiety and the isocyanate moiety is an aromatic isocyanate moiety.
[0124] In one embodiment, the polyol composition of the present invention comprises:
[0125] 10 to 50 %by weight of a polyol as component (A) ; and
[0126] 15 to 80 %by weight of an amine as component (B) ,
[0127] optionally 3 to 45%%by weight of styrene-based polymer, preferably styrene-acrylonitrile copolymer,
[0128] optionally 0.01 to 6 %by weight of glycol (C) , preferably diethylene glycol,
[0129] based on a total weight of the polyol composition,
[0130] wherein component (A) comprises component (A1) derived from poly (oxyethylene) polyol moiety of the polyurethane and component (A2) derived from poly (oxypropylene) polyol moiety of the polyurethane, preferably the molar ratio of component (A1) to component (A2) is in the range from 0: 1 to 5: 1, more preferably 0.1: 1 to 4: 1,
[0131] wherein component (B) comprises or is an aromatic polyamine, such as diamine and polymeric forms thereof, preferably polymeric diphenylmethylene diamine, diphenylmethylene diamine, toluene diamine, phenylene diamine, naphthalene diamine, tetrahydronaphthalene diamine, biphenylene diamine, dimethyl biphenylene diamine, or any combination thereof, more prefera-bly diphenylmethylene diamine and toluene diamine.
[0132] In one embodiment, the polyol composition of the present invention comprises:
[0133] 25 to 45 %by weight of a polyol as component (A) ; and
[0134] 20 to 70 %by weight of an amine as component (B) ,
[0135] optionally 3 to 45%%by weight of styrene-based polymer, preferably styrene-acrylonitrile copolymer,
[0136] optionally 0.01 to 6 %by weight of glycol (C) , preferably diethylene glycol,
[0137] based on a total weight of the polyol composition,
[0138] wherein component (A) comprises component (A1) derived from poly (oxyethylene) polyol moiety of the polyurethane and component (A2) derived from poly (oxypropylene) polyol moiety of the polyurethane, preferably the molar ratio of component (A1) to component (A2) is in the range from0: 1 to 5: 1, more preferably 0.1: 1 to 4: 1,
[0139] wherein component (B) comprises or is an aromatic polyamine, such as diamine and polymeric forms thereof, preferably polymeric diphenylmethylene diamine, diphenylmethylene diamine, toluene diamine, phenylene diamine, naphthalene diamine, tetrahydronaphthalene diamine, biphenylene diamine, dimethyl biphenylene diamine, or any combination thereof, more prefera-bly diphenylmethylene diamine and toluene diamine.
[0140] In one embodiment, the polyol composition of the present invention comprises:
[0141] 10 to 50 %by weight of a polyol as component (A) ; and
[0142] 15 to 80 %by weight of an amine as component (B) ,
[0143] optionally 3 to 45%%by weight of styrene-based polymer, preferably styrene-acrylonitrile copolymer,
[0144] optionally 0.01 to 6 %by weight of glycol (C) , preferably diethylene glycol,
[0145] based on a total weight of the polyol composition,
[0146] wherein component (A) comprises component (A1) derived from poly (oxyethylene) polyol moiety of the polyurethane and component (A2) derived from poly (oxypropylene) polyol moiety of the polyurethane, preferably the molar ratio of component (A1) to component (A2) is in the range from 0: 1 to 5: 1, more preferably 0.1: 1 to 4: 1,
[0147] wherein component (B) comprises or is consisting of 2, 4-toluene diamine, 2, 6-toluene diamine, 4, 4′-diphenylmethane diamine and / or 2, 4′-diphenylmethane diamine, preferably component (B) comprises 4, 4′-diphenylmethane diamine and 2, 4′-diphenylmethane diamine with the molar ratio of 2, 4′-diphenylmethane diamine to 4, 4′-diphenylmethane diamine in the range from 0: 1 to 1: 1, preferably 0.1: 1 to 0.5: 1.
[0148] In one embodiment, the polyol composition of the present invention comprises:
[0149] 25 to 45 %by weight of a polyol as component (A) ; and
[0150] 20 to 70 %by weight of an amine as component (B) ,
[0151] optionally 12 to 30 %by weight of styrene-based polymer, preferably styrene-acrylonitrile copolymer,
[0152] optionally 0.01 to 6 %by weight of glycol (C) , preferably diethylene glycol,
[0153] based on a total weight of the polyol composition,
[0154] wherein component (A) comprises component (A1) derived from poly (oxyethylene) polyol moiety of the polyurethane and component (A2) derived from poly (oxypropylene) polyol moiety of the polyurethane, preferably the molar ratio of component (A1) to component (A2) is in the range from 0: 1 to 5: 1, more preferably 0.1: 1 to 4: 1,
[0155] wherein component (B) comprises or is consisting of 2, 4-toluene diamine, 2, 6-toluene diamine, 4, 4′-diphenylmethane diamine and / or 2, 4′-diphenylmethane diamine, preferably component (B) comprises 4, 4′-diphenylmethane diamine and 2, 4′-diphenylmethane diamine with the molar ratio of 2, 4′-diphenylmethane diamine to 4, 4′-diphenylmethane diamine in the range from 0: 1 to 1: 1, preferably 0.1: 1 to 0.5: 1.
[0156] Process of producing the polyol composition
[0157] One aspect of the present invention relates to a process of producing the polyol composition of the present invention, comprising:
[0158] (1) depolymerizing a polyurethane-based product by a depolymerizing agent to form a de-polymerized product system, and
[0159] (2) distilling the depolymerized product system obtained from step (1) , to obtain the polyol composition.
[0160] The polyurethane used in the process of the present invention comprises a polyol moiety and an isocyanate moiety. For example, the polyurethane may comprise the reaction product of an isocyanate and a polyol.
[0161] The isocyanate for forming the polyurethane of the present invention may be those mentioned above. In the present invention, the isocyanate for forming the polyurethane comprises an aro-matic isocyanate. In a preferred embodiment of the present invention, the isocyanate for form-ing the polyurethane is an aromatic isocyanate.
[0162] The aromatic isocyanate for forming the polyurethane may correspond to the formula R′ (NCO) z wherein R′is aromatic and z is an integer that corresponds to the valence of R′. Typically, z is at least two. Suitable examples of aromatic isocyanates include, but are not limited to, tetra-methylxylylene diisocyanate (TMXDI) , 1, 4-diisocyanatobenzene, 1, 3-diisocyanato-o-xylene, 1, 3-diisocyanato-p-xylene, 1, 3-diisocyanato-m-xylene, 2, 4-diisocyanato-1-chlorobenzene, 2, 4-diisocyanato-1-nitro-benzene, 2, 5-diisocyanato-1-nitrobenzene, m-phenylene diisocyanate, p-phenylene diisocyanate, 2, 4-toluene diisocyanate, 2, 6-toluene diisocyanate, mixtures of 2, 4-and 2, 6-toluene diisocyanate, 1, 5-naphthalene diisocyanate, 1-methoxy-2, 4-phenylene diisocy-anate, 4, 4′-diphenylmethane diisocyanate, 2, 4′-diphenylmethane diisocyanate, 4, 4′-biphenylene diisocyanate, 3, 3′-dimethyl-4, 4′-diphenylmethane diisocyanate, 3, 3′-dimethyldiphenylmethane-4, 4′-diisocyanate, triisocyanates such as 4, 4′, 4″-triphenylmethane triisocyanate polymethylene polyphenylene polyisocyanate and 2, 4, 6-toluene triisocyanate, tetraisocyanates such as 4, 4′-dimethyl-2, 2′-5, 5′-diphenylmethane tetraisocyanate, toluene diisocyanate, 2, 2′-diphenylmethane diisocyanate, 2, 4′-diphenylmethane diisocyanate, 4, 4′-diphenylmethane diisocyanate (4, 4′-methylenediphenyl isocyanate) , polymethylene polyphenylene polyisocyanate, corresponding isomeric mixtures thereof, and combinations thereof. Alternatively, the aromatic isocyanate may be or include a triisocyanate product of m-TMXDI and 1, 1, 1-trimethylolpropane, a reaction product of toluene diisocyanate and 1, 1, 1-trimethyolpropane, and combinations thereof. In one embodiment, the isocyanate for forming the polyurethane is or includes a diisocyanate selected from the group of methylene diphenyl diisocyanates, toluene diisocyanates, hexamethylene diisocyanates, H12MDIs, and combinations thereof.
[0163] In a preferred embodiment of the present invention, the isocyanate for forming the polyurethane comprises an aromatic diisocyanate, preferably diphenylmethylene diisocyanate, toluene diiso-cyanate, phenylene diisocyanate, naphthalene diisocyanate, tetrahydronaphthalene diisocya-nate, biphenylene diisocyanate, dimethyl biphenylene diisocyanate, or any combination thereof, more preferably diphenylmethylene diisocyanate and toluene diisocyanate.
[0164] Preferably, the isocyanate for forming the polyurethane comprises or is consisting of 2, 4-toluene diisocyanate, 2, 6-toluene diisocyanate, 4, 4′-diphenylmethane diisocyanate and / or 2, 4′-diphenylmethane diisocyanate, preferably the isocyanate for forming the polyurethane compris-es 4, 4′-diphenylmethane diisocyanate and 2, 4′-diphenylmethane diisocyanate with the molar ratio of 2, 4′-diphenylmethane diisocyanate to 4, 4′-diphenylmethane diisocyanate in the range from 0: 1 to 1: 1, for example 0.1: 1, or 0.2: 1, or 0.3: 1, or 0.4: 1, or 0.5: 1, or 0.6: 1, or 0.7: 1, or 0.8: 1, or 0.9: 1, or 1: 1, or of any molar ratio between these values, such as from 0.1: 1 to 0.8: 1, prefer-ably from 0.1: 1 to 0.6: 1, more preferably from 0.1: 1 to 0.5: 1.
[0165] The polyol for forming the polyurethane of the present invention may be those mentioned above. In a preferred embodiment of the present invention, the polyol used in the present invention is a polyether polyol.
[0166] As the alkylene oxide, preference is given to using one or more compounds having from 2 to 4 carbon atoms in the alkylene radical, e.g., ethylene oxide, 1, 3-propylene oxide, tetrahydrofuran, 1, 2-or 2, 3-butylene oxide, in each case either alone or in the form of mixtures, and preferably ethylene oxide, 1, 2-propylene oxide and / or tetrahydrofuran, most preferably tetrahydrofuran.
[0167] Possible starter molecules are, for example, ethylene glycol, diethylene glycol, glycerol, trime-thylolpropane, pentaerythritol, sugar derivatives such as sucrose, sugar alcohol such as sorbitol, methylamine, ethylamine, isopropylamine, butylamine, benzylamine, aniline, toluidine, toluene-diamine, naphthylamine, ethylenediamine, diethylenetriamine, 4, 4'-methylenedianiline, 1, 3-propanediamine, 1, 6-hexanediamine, ethanolamine, diethanolamine, triethanolamine and other dihydric or polyhydric alcohols or monofunctional or polyfunctional amines.
[0168] Examples of polyether polyols can also include a ring-opening polymer of tetrahydrofuran (poly-tetramethylene glycol, PTMEG) , natural oil-based polyether polyols like alkoxylated castor oil or other polyether polyols based on natural oils or fats, e.g., those obtained by ring opening reac-tion of epoxidized unsaturated vegetable oils, polyether polyols based on saccharides.
[0169] In a preferred embodiment of the present invention, the polyol moiety of the polyurethane is a poly (oxyalkylene) polyol moiety, such as a poly (oxyalkylene) polyol moiety with the oxyalkylene having 2 to 4 carbon atoms, more preferably a poly (oxyalkylene) polyol moiety comprising at least one unit selected from oxyethylene, oxypropylene, oxybutylene, and oxytetramethylene. Preferably, in the present invention, the polyol moiety of the polyurethane has a number aver-age molecular weight in the range from 500 to 10,000 g / mol, such as 800 g / mol, 1,000 g / mol, 2,000 g / mol, 3,000 g / mol, 4,000 g / mol, 5,000 g / mol, 6,000 g / mol, 7,000 g / mol, 8,000 g / mol, 9,000 g / mol, 10,000 g / mol, of any number average molecular weight between these values, preferably in the range from 1,000 to 8,000 g / mol and more preferably in the range from 2,000 to 8,000 g / mol.
[0170] In a preferred embodiment of the present invention, the polyurethane used in the process of the present invention comprises a poly (oxyethylene) polyol moiety and a poly (oxypropylene) polyol moiety, preferably the molar ratio of the poly (oxyethylene) polyol moiety to the poly (oxypropylene) polyol moiety is in the range from 0: 1 to 5: 1, for example 0.05: 1, or 0.1: 1, or 0.2: 1, or 0.4: 1, or 0.6: 1, or 0.8: 1, or 1: 1, or 1.2: 1, or 1.4: 1, or 1.6: 1, or 1.8: 1, or 2.0: 1, or 2.2: 1, or 2.4: 1, or 2.6: 1, or 2.8: 1, or 3.0: 1, or 3.2: 1, or 3.4: 1, or 3.6: 1, or 3.8: 1, or 4: 1, or 4.3: 1, or 4.6: 1, or 4.8: 1, or is of any molar ratio between these values, such as from 0.051: 1 to 5: 1, preferably from 0.1: 1 to 5: 1, more preferably from 0.1: 1 to 4: 1, most preferably from 0.1: 1 to 3: 1.
[0171] The polyurethane usable in the present invention may further take a chain extender as one of the raw materials.
[0172] Suitable chain extender may be selected by a skilled person and may comprise aliphatic, arali-phatic, aromatic, and / or cycloaliphatic compounds having two or three functional groups. For example, the chain extender suitable for the polyurethane in present invention may be selected from bifunctional or trifunctional amines and alcohols, in particular diols, triols or both, such as diamines and / or alkanediols having from 2 to 10 carbon atoms in the alkylene radical.
[0173] As examples of the chain extender suitable for the present invention, it may be mentioned eth-ylene glycol, 1, 2-propanediol, 1, 3-propanediol, 1, 4-butanediol, 1, 2-pentanediol, 1, 3-pentanediol, 1, 10-decanediol, 1, 2-dihydroxycyclohexane, 1, 3-dihydroxycyclohexane, 1, 4-dihydroxycyclohexane, diethylene glycol and triethylene glycol, dipropylene glycol and tripropyl-ene glycol, 1, 6-hexanediol and bis (2-hydroxyethyl) hydroquinone; triols such as 1, 2, 4-trihydroxycyclohexane, 1, 3, 5-trihydroxycyclohexane, glycerol and trimethylolpropane. A particu-larly preferable chain extender includes 1, 3-propanediol, 1, 4-butanediol, or 1, 6-hexanediol. In certain cases, it is possible to use the mixture of two chain extenders.
[0174] The depolymerizing agent useful in step (1) of the process of the present invention may be se-lected by a skilled person according to practical operation and application. In a preferred em-bodiment of the invention, the depolymerizing agent is selected from a group consisting of water, a compound having OH number of at least 300 mgKOH / g, and a compound having Amine value of at least 300 mgKOH / g.
[0175] As the compound having OH number of at least 300 mgKOH / g, examples may be glycols hav-ing preferably 2 to 25 or 2 to 12 carbon atoms, for example C1-C20-diols and the corresponding di-and polyalkylene glycols, such as C1-C15-alkylene glycols, C1-C10-alkylene glycols and the corresponding di-and polyalkylene glycols, in particular 1, 2-ethanediol, 1, 2-propanediol, 1, 3-propanediol, 1, 4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, 1, 10-decanediol, diethylene glycol, 2, 2, 4-trimethylpentane-1, 5-diol, 2, 2-dimethylpropane-1, 3-diol, 1, 4-dimethylolcyclohexane, 1, 6-dimethylolcyclohexane, 2, 2-bis (4-hydroxyphenyl) -propane (bisphenol A) , 2, 2-bis (4- hydroxyphenyl) butane (bisphenol B) , 1, 1-bis (4-hydroxyphenyl) -3, 3, 5-trimethylcyclohexane (bi-sphenol C) , dipropylene glycol and polyethylene glycol, preferably ethylene glycol, diethylene glycol, triethylene glycol, PEG 300-600, propylene glycol, dipropylene glycol.
[0176] As the compound having OH number of at least 300 mgKOH / g, examples may further comprise more highly hydric alcohols, such as trihydric (triols) , tetrahydric (tetrols) and / or pentahydric alcohols (pentols) , including but not being limited to, glycerin, trimethylolethane, trimethylolpro-pane, erythritol, pentaerythritol, sorbitol, and the like, preferably glycerin.
[0177] Further examples of the compound having OH number of at least 300 mgKOH / g may comprise amino alcohols, such as ethanolamine, diethanolamine and triethanolamine, preferably diethan-olamine and triethanolamine.
[0178] As the compound having Amine value of at least 300 mgKOH / g, preferably examples comprise ammonia, C1-C20-amine, for example C1-C20-alkylenediamine, such as C1-C15-alkylenediamine, C1-C10-alkylenediamine, more preferably ammonia, ethylenediamine, propylene diamine, bu-tanediamine.
[0179] The combinations of two or more of these depolymerizing agents may also be used in the pro-cess of the present invention.
[0180] In the process of the present invention, the amounts of the depolymerizing agent and of the pol-yurethane-based product used in step (1) may be determined by a skilled person according to practical operation. For example, the amount of the depolymerizing agent may be determined as the function of the amount of the polyurethane-based product used in step (1) . In a preferred embodiment of the invention, in step (1) , the ratio by weight of the polyurethane-based product to be depolymerized to the depolymerizing agent that is added is in the range from 3: 1 to 1: 2, for example 3: 1, 2: 1, 1: 1, 1: 2, or is of any ratio between these values. Preferably, in step (1) , the ratio by weight of the polyurethane-based product to be depolymerized to the depolymerizing agent that is added is in the range from 3: 1 to 1: 1.
[0181] Step (1) of the process of the present invention may be carried out in the presence of a catalyst. In some embodiment of the invention, the catalyst may be selected from a group consisting of amine such as tertiary amine, titanium-or tin-based catalysts, alkali metal acetates such as potassium acetate, and alkali metal hydroxides, such as KOH and NaOH. Preferably, the cata-lyst is selected from alkali metal hydroxides.
[0182] Examples of the tertiary amine catalyst may comprise but not limited to: triethylamine, tributyla-mine, dimethylbenzylamine, N-methylmorpholine, N-ethylmorpholine, N-cyclohexyl-morpholine, N, N, N′, N′-tetramethylethylenediamine, N, N, N′, N′-tetramethylbutanediamine, N, N, N′, N′-tetramethylhexanediamine, pentamethyldiethylenetriamine, bis (dimethylaminoethyl) ether, bis(dimethylaminopropyl) urea, dimethylpiperazine, 1, 2-dimethylimidazole, 1-azabicyclo [3.3.0] octane and 1, 4-diazabicyclo [2.2.2] octane.
[0183] Examples of the tin-based catalyst may comprise but not limited to: tin (II) salts of organic car-boxylic acids, e.g. tin (II) acetate, tin (II) octoate, tin (II) ethylhexanoate and tin (II) laurate, and the dialkyltin (IV) salts of organic carboxylic acids, e.g. dibutyltin diacetate, dibutyltin dilaurate, dibu-tyltin maleate and dioctyltin diacetate.
[0184] In step (1) of the process of the present invention, the amount of the catalyst used is in the range from 0.1 to 2%by weight, for example, 0.1%by weight, 0.2%by weight, 0.5%by weight, 0.8%by weight, 1.0%by weight, 1.2%by weight, 1.5%by weight, 1.6%by weight, 1.8%by weight, 2%by weight, or is of any amount between these values, preferably in the range from 0.1 to 1.5%by weight, more preferably in the range from 0.1 to 1%by weight, based on the total weight of the polyurethane-based product, the depolymerizing agent and the catalyst used in step (1) .
[0185] The temperature for carrying out step (1) of the process of the present invention may be deter-mined by a skilled person according to practical operation. For example, step (1) of the process of the present invention may be carried out at a temperature in the range from 160℃ to 240℃, for example at 160℃, 170℃, 180℃, 190℃, 200℃, 210℃, 220℃, 230℃, 240℃, or at any temperature between these values, preferably in the range from 170℃ to 230℃, preferably in the range from 180℃ to 220℃, more preferably in the range from 190℃ to 220℃.
[0186] The time for carrying out step (1) of the process of the present invention may be determined by a skilled person according to practical applications. Preferably, step (1) may be carried out for a period in the range from 2 to 24 hours.
[0187] Step (1) of the process of the present invention may be carried out in protective atmosphere and ambient pressure, such as nitrogen protection atmosphere and atmospheric pressure.
[0188] The process of the present invention further comprises step (2) , wherein the depolymerized product system obtained from step (1) is further distillated.
[0189] In the process of the present invention, the whole system obtained from step (1) may be used as the depolymerized product system for further distilling in step (2) of the process. Preferably, in the case that a phase separation happens in the system obtained from step (1) , the products collected from the bottom layer phase of the system may be used as the depolymerized product system for further distilling in step (2) of the process.
[0190] Preferably, step (2) of the process of the present invention is carried out at a temperature in the range from 160℃ to 240℃, for example at 160℃, 170℃, 180℃, 190℃, 200℃, 210℃, 220℃, 230℃, 240℃, or at any temperature between these values, preferably in the range from 170℃to 230℃, preferably in the range from 180℃ to 220℃, more preferably in the range from 190℃to 220℃.
[0191] Preferably, step (2) of the process of the present invention is carried out at a pressure in the range from 10 to 100 mbar, for example at 10mbar, 20mbar, 30mbar, 40mbar, 50mbar, 60mbar, 70mbar, 80mbar, 90mbar, 100 mbar, or at any pressure between these values, preferably in the range from 20mbar to 80mbar, preferably in the range from 30mbar to 70mbar, more preferably in the range from 40mbar to 60mbar.
[0192] In an embodiment of the invention, the distillation residue from step (2) is the polyol composition of the present invention.
[0193] In one embodiment of the invention, the process of the present invention comprises the step of:
[0194] (1) depolymerizing a polyurethane-based product by a depolymerizing agent to form a depol-ymerized product system, and
[0195] (2) distilling the depolymerized product system obtained from step (1) , to obtain the polyol composition,
[0196] wherein the depolymerizing agent is selected from:
[0197] water;
[0198] a compound having OH number of at least 300 mgKOH / g, preferably C1-C20-diols, C1-C20-triols or C1-C20-alkanolamines;
[0199] a compound having amine value of at least 300 mgKOH / g, preferably ammonia, C1-C20-amine, such as C1-C20-alkylenediamine;
[0200] or any combination thereof.
[0201] In one embodiment of the invention, the process of the present invention comprises the step of:
[0202] (1) depolymerizing a polyurethane-based product by a depolymerizing agent to form a depol-ymerized product system, and
[0203] (2) distilling the depolymerized product system obtained from step (1) , to obtain the polyol composition,
[0204] wherein the depolymerizing agent is selected from:
[0205] water;
[0206] a compound having OH number of at least 300 mgKOH / g, which is selected from a group consisting of ethylene glycol, diethylene glycol, triethylene glycol, PEG 300-600, propylene gly-col, dipropylene glycol, diethanolamine, triethanolamine, and glycerin;
[0207] a compound having amine value of at least 300 mgKOH / g, which is selected from a group consisting of ammonia, ethylenediamine, propylene diamine, butanediamine;
[0208] or any combination thereof.
[0209] In one embodiment of the invention, the process of the present invention comprises the step of:
[0210] (1) depolymerizing a polyurethane-based product by a depolymerizing agent to form a depol-ymerized product system, and
[0211] (2) distilling the depolymerized product system obtained from step (1) , to obtain the polyol composition,
[0212] wherein the depolymerizing agent is selected from:
[0213] water;
[0214] a compound having OH number of at least 300 mgKOH / g, preferably C1-C20-dicols, C1-C20-triols or C1-C20-alkanolamines;
[0215] a compound having Amine value of at least 300 mgKOH / g, preferably ammonia, C1-C20-amine, such as C1-C20-alkylenediamine;
[0216] or any combination thereof,
[0217] wherein in step (1) , the ratio by weight of the polyurethane-based product to be depolymer-ized to the depolymerizing agent is 3: 1 to 1: 2.
[0218] In one embodiment of the invention, the process of the present invention comprises the step of:
[0219] (1) depolymerizing a polyurethane-based product by a depolymerizing agent to form a depol-ymerized product system, and
[0220] (2) distilling the depolymerized product system obtained from step (1) , to obtain the polyol composition,
[0221] wherein the depolymerizing agent is selected from:
[0222] water;
[0223] a compound having OH number of at least 300 mgKOH / g, which is selected from a group consisting of ethylene glycol, diethylene glycol, triethylene glycol, PEG 300-600, propylene gly-col, dipropylene glycol, diethanolamine, triethanolamine, and glycerin;
[0224] a compound having Amine value of at least 300 mgKOH / g, which is selected from a group consisting of ammonia, ethylenediamine, propylene diamine, butanediamine;
[0225] or any combination thereof,
[0226] wherein in step (1) , the ratio by weight of the polyurethane-based product to be depolymer-ized to the depolymerizing agent is 3: 1 to 1: 2.
[0227] In one embodiment of the invention, the process of the present invention comprises the step of:
[0228] (1) depolymerizing a polyurethane-based product by a depolymerizing agent to form a depol-ymerized product system, and
[0229] (2) distilling the depolymerized product system obtained from step (1) , to obtain the polyol composition,
[0230] wherein the depolymerizing agent is selected from:
[0231] water;
[0232] a compound having OH number of at least 300 mgKOH / g, preferably C1-C20-diols, C1-C20-triols or C1-C20-alkanolamines;
[0233] a compound having Amine value of at least 300 mgKOH / g, preferably ammonia, C1-C20-amine, such as C1-C20-alkylenediamine;
[0234] or any combination thereof,
[0235] wherein in step (1) , the ratio by weight of the polyurethane-based product to be depolymer-ized to the depolymerizing agent is 3: 1 to 1: 2,
[0236] wherein step (2) is carried out at a temperature of 160-240℃ and at a pressure of 10 to 100 mbar, and
[0237] wherein the polyol composition is the distillation residue from step (2) .
[0238] In one embodiment of the invention, the process of the present invention comprises the step of:
[0239] (1) depolymerizing a polyurethane-based product by a depolymerizing agent to form a depol-ymerized product system, and
[0240] (2) distilling the depolymerized product system obtained from step (1) , to obtain the polyol composition,
[0241] wherein the depolymerizing agent is selected from:
[0242] water;
[0243] a compound having OH number of at least 300 mgKOH / g, which is selected from a group consisting of ethylene glycol, diethylene glycol, triethylene glycol, PEG 300-600, propylene gly-col, dipropylene glycol, diethanolamine, triethanolamine, and glycerin;
[0244] a compound having Amine value of at least 300 mgKOH / g, which is selected from a group consisting of ammonia, ethylenediamine, propylene diamine, butanediamine;
[0245] or any combination thereof,
[0246] wherein in step (1) , the ratio by weight of the polyurethane-based product to be depolymer-ized to the depolymerizing agent is 3: 1 to 1: 2,
[0247] wherein step (2) is carried out at a temperature of 160-240℃ and at a pressure of 10 to 100 mbar, and
[0248] wherein the polyol composition is the distillation residue from step (2) .
[0249] Applications
[0250] The polyol composition of the present invention and the polyol composition produced from the process of the present invention are obtainable from depolymerizing polyurethane (PU) materi-als, and find various applications in various fields. Especially, the polyol composition of the pre-sent invention and the polyol composition produced from the process of the present invention are useful as an additive in a bitumen composition for obtaining improved properties, especially as an additive in a paving bitumen composition, for obtaining improved properties such as rut-ting resistance and aging resistance, and expanded temperature range for laying the bitumen composition.
[0251] Bitumen composition
[0252] The present invention further relates to a bitumen composition comprising:
[0253] (a) a base bitumen; and
[0254] (b) the polyol composition of the present invention or the polyol composition produced from the process of the present invention.
[0255] In the present invention, as component (a) , the “base bitumen” refers to a bitumen without the addition of component (b) . The term “bitumen” encompasses the concept of the term “asphalt” . Suitable bitumen or asphalt according to the present invention are for example disclosed in U.S. Pat. Spec. Nos. 4,247,335 and 5,473,000.
[0256] Bitumen and asphalt are normally solid, semi-solid or viscous liquid materials at ordinary at-mospheric temperatures. Such asphalts and bitumen are mixtures of hydrocarbons of natural or pyrogenous origin and are usually derived from petroleum or coal but may occur as such in na-ture. Also included within the definition of bitumen and asphalt are road oil and road tar. Asphalt modified with synthetic rubber, employed for example for paving, may also be used in the pre-sent invention as component (a) . Modified asphalt is disclosed for example in U.S. Pat. Spec. No. 5,473,000. Synthetic rubber is for example styrene-butadiene rubber.
[0257] The bitumen composition of the present invention is in particular applicable in road paving or in roofing materials. The bitumen composition of the present invention can be used, for example, as binders with mineral aggregates, fillers or fiber materials, in which case the working in gen-eral takes place by using melting.
[0258] Preferably, the amount of component (a) in the bitumen composition of the present invention can be in the range from 60 to 95%by weight, for example 60%by weight, 63%by weight, 65%by weight, 68%by weight, 70%by weight, 73%by weight, 75%by weight, 78%by weight, 80%by weight, 83%by weight, 85%by weight, 88%by weight, 90%by weight, 93%by weight, 95%by weight, preferably from 70 to 95%by weight, more preferably from 80 to 95%by weight, based on the total weight of the bitumen composition.
[0259] Preferably, the amount of component (b) in the bitumen composition of the present invention can be in the range from 5 to 25%by weight, for example 5%by weight, 6%by weight, 8%by weight, 10%by weight, 13%by weight, 15%by weight, 18%by weight, 20%by weight, 23%by weight, 25%by weight, preferably from 5 to 20%by weight, more preferably from 5 to 15%by weight, based on the total weight of the bitumen composition.
[0260] Process of producing the bitumen composition
[0261] One aspect of the present invention relates to a process of producing the bitumen composition of the present invention.
[0262] The bitumen composition of the present invention may be prepared by a skilled person accord-ing to practical operation. In an embodiment of the invention, the bitumen composition of the present invention may be prepared by firstly heating the polyol composition of the present in-vention at a temperature in the range from about 100℃ to about 200℃, such as 150℃, then blending the heated polyol composition into a base bitumen under a fixed process temperature to get a homogeneous mixture. Said homogeneous mixture is ready for further using.
[0263] In an embodiment of the invention, the bitumen composition of the present invention may be prepared by a process comprising:
[0264] (1-i) heating the polyol composition of the present invention at a temperature in the range from about 100℃ to about 200℃, such as 150℃, and
[0265] (1-ii) blending the heated polyol composition into a base bitumen under a fixed process tem-perature in the range from about 100℃ to about 200℃, such as about 130℃ to about 165℃, preferably140℃ to about 160℃, to get the bitumen composition.
[0266] In another embodiment of the invention, the bitumen composition of the present invention may be prepared by firstly grinding the polyol composition of the present invention (for example, if the polyol composition possesses a solid and non-sticky status, which can be grinded into pow-der) , then blending the ground polyol composition into a base bitumen under a fixed process temperature to get a mixture. Said mixture is ready for further using.
[0267] The fixed process temperature for blending the polyol composition into the base bitumen may be determined by a skilled person according to practical operations. For example, it may be a temperature in the range from about 100℃ to about 200℃, such as about 130℃ to about 165℃, preferably140℃ to about 160℃.
[0268] In an embodiment of the invention, the bitumen composition of the present invention may be prepared by a process comprising:
[0269] (2-i) heating a base bitumen up to a temperature in the range from about 100℃ to about 200℃, and
[0270] (2-ii) mixing the heated base bitumen with the polyol composition of the present invention with a shear rate in the range from such as 1000 to 4000 rpm, preferably 2000 rpm, at a tem-perature in the range from about 100℃ to about 200℃, for a period of time in the range from about 5min to 3 hours.
[0271] In another embodiment of the invention, the bitumen composition of the present invention may be prepared by firstly heating a base bitumen up to a temperature in the range from about 100℃ to about 200℃, preferably 145℃, then mixing the heated base bitumen with the polyol composition of the present invention with a shear rate in the range from such as 1000 to 4000 rpm, preferably 2000 rpm, at a temperature in the range from about 100℃ to about 200℃, such as about 130℃ to about 150℃, preferably 145 ℃, for a period of time in the range from about 5min to 3 hours, preferably 30 min.
[0272] In another embodiment of the invention, the bitumen composition of the present invention may be prepared by firstly heating a base bitumen up to a temperature in the range from about 100℃ to about 200℃, such as about 130℃ to about 150℃, preferably 145℃, then mixing the heated base bitumen with the polyol composition of the present invention with a shear rate in the range from such as 1000 to 4000 rpm, preferably 2000 rpm, at a temperature in the range from about 100℃ to about 200℃, preferably 145 ℃, for a period of time in the range from about 5min to 3 hours, preferably 5-10 min.
[0273] With the polyol composition of the present invention, the bitumen composition of the present invention has greatly improved advantages. For example, it has expanded temperature range for laying the bitumen composition, at the same time maintain or optimize the properties of bi-tumen, such as improved rutting resistance and aging resistance, and decreased operation temperature for laying the bitumen composition, which is desirable for applications such as road / bridge pavement.
[0274] Examples
[0275] The present invention will be better understood in view of the following non-limiting examples.
[0276] Methods
[0277] (1) Determination of amine Number:
[0278] The amine number was determined according to DIN 53176 by titration of a solution of the pol-ymer in acetic acid with perchloric acid.
[0279] (2) Determination of OH Number (Hydroxyl Number) :
[0280] The OH number was determined according to DIN 53240-2 (date: November 2007) . The OH groups were reacted by acetylation with an excess of acetic anhydride. The excess acetic anhydride was subsequently reacted by addition of water to form acetic acid, and the entire acetic acid was back-titrated with ethanolic KOH.
[0281] The OH number indicates the amount of KOH in mg that is equivalent to the amount of acetic acid bound in the acetylation of 1 g of the compound under analysis.
[0282] (3) Determination of Number average Molecular Weight, Weight average Molecular Weight and polymer dispersity index (PDI) :
[0283] The number average (Mn) and weight average (Mw) molecular weights, and the polymer dis-persity index (PDI) were determined by means of gel permeation chromatography (GPC) with tetrahydrofuran as eluent and using a poly (ethylene glycol) standard and was based on DIN 55672-1 (date: August 2007) . A styrene-divinylbenzene copolymer was used as column materi-al.
[0284] (4) Determination of viscosity
[0285] The viscosity was determined according to according to EN 12595 at 23℃.
[0286] (5) Determination of softening point
[0287] Softening point (Vicat softening point) was determined on standard small specimens according to EN 1427 in the range of 28 ℃ to 150 ℃.
[0288] (6) Determination of penetration
[0289] Needle penetration was determined according to EN 1426.
[0290] (7) MSCR test for rutting resistance
[0291] Rutting resistance was determined in a Multiple Stress Creep Recovery (MSCR) test, in which a rotating film aging oven (RTFO) was used and a bitumen composition was subjected to a 1-second shear creep load (0.1kPa and 3.2 kPa) , 9-second recovery, and 10 cycles. Recovery strain (%) was reported. The higher the average percent recovery, the better the resistance to high-temperature rutting of the bitumen composition would be.
[0292] (8) RAI test for aging resistance
[0293] For each bitumen composition prepared in examples, Dynamic Shear Rheometer (DSR) test was conducted according to AASHTO T315 obtain complex shear modulus (G*) . A frequency sweep using DSR was done on the unaged and PAV aged bitumen composition (unaged binder and aged binder in figure 1) , and the curves were provided in figure 1.
[0294] The rheologic aging index (RAI) was determined by calculating the difference between the area under the long-term aged (PAV) and virgin G*master curves:
[0295] Example 1 preparation of polyol compositions
[0296] A polyol composition was obtained by the process as follows.
[0297] The glycolysis agent diethylene glycol (19.7 kg) and the catalyst potassium hydroxide (0.6 kg) were added into a 100L reactor and heated with agitation and reflux column. The reactor was protected in a nitrogen atmosphere to avoid oxidation of the reactants. When the temperature of mixture reached 200 ℃, shredded foam scrap (19.7 kg) with a particle size of about 1-2 cm, which was based on polyurethane foams from end-of-life furniture, was added into the reactor. After feeding, the reaction continued for 2 h at 200℃. At the end of reaction, a liquid degrada-tion mixture was obtained. The degradation mixture was discharged from the reactor when it was cooled to 80℃.
[0298] The cooled degradation mixture was discharged into a metal vessel for phase separation by standing for 48 h at room temperature. The degradation mixture split into liquid-solid-liquid three phases. After removal of the upper layer, the middle and bottom layers was mixed and under-went distillation to remove diethylene glycol. The distillation was performed for 8 h under a tem-perature of 235 ℃ and the pressure was gradually reduced to about 50 mbar. Distilled diethy-lene glycol was condensed and collected, and distillation residue was obtained as the polyol composition.
[0299] Polyol compositions 1 through 7 were prepared by the process, with polyurethane foams from different sources. The components of each polyol composition were determined by 13C NMR using CDCl3 and their contents are provided in table 1. The percentage in table 1 is the per-centage by weight.
[0300] Table 1
[0301] PEOL: polyether polyol component, comprising polyol component having propylene oxide seg-ment (PO) and polyol component having ethylene oxide segment (EO) .
[0302] DEG: DiEthylene Glycol
[0303] TDA: Toluenediamine
[0304] MDA: Methylenedianiline
[0305] SAN: Poly (styrene-co-acrylonitrile)
[0306] Example 2 preparation of bitumen compositions
[0307] Several bitumen compositions were prepared by mixing different amounts of polyol composition 7 prepared in example 1 with a base bitumen. Bitumen JB70# (Commercially available from Shandong Chambroad Petrochemicals Co., Ltd., Shandong China) was used as the base bitu-men.
[0308] Bitumen compositions 1 to 4 were prepared and the properties thereof were tested. The results were provided in table 2.
[0309] Each bitumen composition of bitumen compositions 2 to 4 was prepared by the process com-prising the following steps:
[0310] (1) heating the base bitumen (JB70#) up to 145 ℃, and
[0311] (2) mixing polyol composition 7 in an amount as shown in table 2 with the base bitumen from step (1) , wherein the mixture was stirred by a high-shear mixer at a shear rate of 2000 rpm under a temperature of 145 ℃ for 30 min, to obtain the bitumen composition.
[0312] The amount of polyol composition 7 was provided as “RPF Content” in table 2.
[0313] Table 2
[0314] The higher the average percent recovery (R) , the better the resistance to high-temperature rutting of the bitumen. Bitumen compositions 2 to 4 modified by the polyol compositions have better rutting resistance than base bitumen, both under 0.1kPa and 3.2kPa. This is beneficial. For example, improved rutting resistance will make the bitumen pavement more suitable for running heavy duty vehicles or for high-speed running, avoiding premature pavement deterioration and early end of life.
[0315] In bitumen compositions 2 to 4, RAI decreases significantly. The thermal-oxidative aging resistance of bitumen is improved.
Claims
1.A polyol composition obtained from depolymerization of a polyurethane-based product, which comprises, based on a total weight of the polyol composition:10 to 50 %, preferably 25 to 45 %by weight of a polyol as component (A) ; and15 to 80 %, preferably 20 to 70 %by weight of an amine as component (B) , wherein com-ponent (B) comprises an aromatic amine.2.The polyol composition according to claim 1, wherein component (B) is consisting of the aro-matic amine.3.The polyol composition according to claim 1 or 2, wherein the polyurethane has a polyol moi-ety, and the polyol moiety is a polyester polyol moiety and / or a polyether polyol moiety, prefera-bly a poly (oxyalkylene) polyol moiety with the oxyalkylene having 2 to 4 carbon atoms, more preferably a poly (oxyalkylene) polyol moiety comprising at least one unit selected from oxyeth-ylene, oxypropylene, oxybutylene, and oxytetramethylene.4.The polyol composition according to any one of claims 1 to 3, wherein component (A) com-prises component (A1) derived from poly (oxyethylene) polyol moiety of the polyurethane and component (A2) derived from poly (oxypropylene) polyol moiety of the polyurethane, preferably the molar ratio of component (A1) to component (A2) is in the range from 0: 1 to 5: 1, more pref-erably 0.1: 1 to 4: 1.5.The polyol composition according to any one of claims 1 to 4, wherein the aromatic amine comprises an aromatic polyamine, such as diamine and polymeric forms thereof, preferably polymeric diphenylmethylene diamine, diphenylmethylene diamine, toluene diamine, phenylene diamine, naphthalene diamine, tetrahydronaphthalene diamine, biphenylene diamine, dimethyl biphenylene diamine, or any combination thereof, more preferably diphenylmethylene diamine and toluene diamine.6.The polyol composition according to any one of claims 1 to 5, wherein the aromatic amine comprises 2, 4-toluene diamine, 2, 6-toluene diamine, 4, 4′-diphenylmethane diamine and / or 2, 4′-diphenylmethane diamine, preferably the aromatic amine comprises 4, 4′-diphenylmethane dia-mine and 2, 4′-diphenylmethane diamine with the molar ratio of 2, 4′-diphenylmethane diamine to 4, 4′-diphenylmethane diamine in the range from 0: 1 to 1: 1, preferably 0.1: 1 to 0.5: 1.7.The polyol composition according to any one of claims 1 to 6, wherein the polyol composi-tion further comprises:styrene-based polymer, preferably styrene-acrylonitrile copolymer, preferably in an amount of 0 to 50 %, preferably from 3 to 45%by weight, based on the total weight of the polyol compo-sition.8.The polyol composition according to any one of claims 1 to 7, wherein the polyol composi-tion further comprises a glycol (C) which is not component (A) , preferably diethylene glycol, in a content of 0 to 8 %by weight, preferably 0 to 4 %by weight, based on the total weight of the polyol composition.9.The polyol composition according to any one of claims 1 to 8, which is obtained from the depolymerization of a polyurethane foam, preferably a flexible polyurethane foam.10.The polyol composition according to any one of claims 1 to 9, which is obtained by depoly-merizing the polyurethane-based product to form a depolymerized product system, and distilling the depolymerized product system at a temperature of 160-240℃ and at a pressure of 10 to 100 mbar.11.A process of producing the polyol composition of any one of claims 1 to 10, comprising:(1) depolymerizing a polyurethane-based product by a depolymerizing agent to form a de-polymerized product system, and(2) distilling the depolymerized product system obtained from step (1) , to obtain the polyol composition.12.The process of claim 11, wherein the depolymerizing agent is selected from: water; a com-pound having OH number of at least 300 mgKOH / g, preferably C1-C20-diols, C1-C20-triols, C1-C20-amines, or C1-C20-alkanolamines, more preferably ethylene glycol, diethylene glycol, triethy-lene glycol, PEG 300-600, propylene glycol, dipropylene glycol, diethanolamine, triethanolamine, or glycerin; a compound having amine value of at least 300 mgKOH / g, preferably ammonia, C1-C20-alkylenediamine, more preferably ammonia, ethylenediamine, propylene diamine, butanedi-amine; or any combination thereof.13.The process of claim 11 or 12, wherein in step (1) , the ratio by weight of the polyurethane-based product to be depolymerized to the depolymerizing agent is 3: 1 to 1: 2, preferably 3: 1 to 1: 1.14.The process of any one of claims 11 to 13, wherein step (2) is carried out at a temperature of 160-240℃ and at a pressure of 10 to 100 mbar.15.The process of any one of claims 11 to 14, wherein the polyol composition is obtained from the distillation residue.16.A bitumen composition, comprising:(a) a base bitumen; and(b) a polyol composition of any one of claims 1 to 10 or prepared by the process of any one of claims 11 to 15.17.the bitumen composition of claim 16, whereinthe amount of the base bitumen is in the range from 60 to 95%by weight, preferably 70 to 95%by weight, more preferably 80 to 95%by weight, based on the total weight of the bitumen composition;the amount of the polyol composition is in the range from 5 to 25%by weight, preferably 5 to 20%by weight, more preferably 5 to 15%by weight, based on the total weight of the bitumen composition.18.A process of producing the bitumen composition of any one of claims 16 to 17, comprising:(1-i) heating the polyol composition of any one of claims 1 to 10 or prepared by the process of any one of claims 11 to 15 at a temperature in the range from about 100℃ to about 200℃, such as 150℃, and(1-ii) blending the heated polyol composition with a base bitumen under a process tempera-ture in the range from about 100℃ to about 200℃, such as about 130℃ to about 165℃, pref-erably140℃ to about 160℃, to get the bitumen composition.19.The process of claim 18, further comprising grinding the polyol composition before step (1-i) .20.A process of producing the bitumen composition of any one of claims 16 to 17, comprising:(2-i) heating a base bitumen up to a temperature in the range from about 100℃ to about 200℃, such as 130℃ to about 150℃, and(2-ii) mixing the heated base bitumen with the polyol composition of the present invention with a shear rate in the range from such as 1000 to 4000 rpm, preferably 2000 rpm, at a tem-perature in the range from about 100℃ to about 200℃, such as 130℃ to about 150℃, for a period of time in the range from about 5min to 3 hours.
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