Double metal cyanide catalyst and preparation method thereof

Abstract

One form of the present invention provides a double metal cyanide catalyst having excellent catalytic activity and a preparation method thereof. Specifically, the double metal cyanide catalyst according to one form of the present invention is characterized in that it is prepared using a complexing agent comprising tertiary butanol, a linear or cyclic (C2-C12) aliphatic polyol, and a polyalkylene glycol.

Description

Technical Field

[0001] The present invention relates to a double metal cyanide (DMC) catalyst with excellent catalytic activity and a preparation method thereof. Background Art

[0002] Polyether carbonate polyols are widely used in adhesives, packaging materials, and coatings, and are particularly attracting attention as biodegradable polymers. Furthermore, the production of polyether carbonate polyols by reacting epoxy compounds with carbon dioxide is an environmentally friendly method that utilizes greenhouse gases without using toxic compounds. Research is ongoing to develop catalysts suitable for this reaction.

[0003] Double metal cyanide (DMC) catalysts are used to polymerize polymer products such as polyether and polyetherester polyols. Compared to traditional alkaline catalysts, DMC catalysts offer the advantage of producing higher-quality polymers with lower unsaturation and higher molecular weight.

[0004] However, when DMC catalysts are used in the reaction of epoxy compounds with carbon dioxide to produce polyether carbonate polyols, their limitations lie in their insufficient catalytic activity, the high catalyst dosage, and the need to remove residual catalyst after the polymerization reaction. Furthermore, attempts to reduce the catalyst dosage prolong the polymerization reaction time and reduce the quality of the polymer product, resulting in reduced production efficiency and increased difficulties in commercialization. Summary of the Invention

[0005] Problems to be solved by the invention

[0006] The object of the present invention is to provide a double metal cyanide catalyst having excellent catalytic activity in the polymerization reaction of polyether carbonate polyol and a preparation method thereof.

[0007] Another object of the present invention is to provide a method for preparing high-quality polyether carbonate polyols using a double metal cyanide catalyst.

[0008] Means for solving problems

[0009] In a general form, a double metal cyanide catalyst composition includes: tert-butyl alcohol as a complexing agent, a linear or cyclic (C2-C12) aliphatic polyol, and a polyalkylene glycol.

[0010] The complexing agent may include tert-butyl alcohol and aliphatic polyol in a molar ratio of 1:0.1 to 0.9.

[0011] The aliphatic polyol may be a diol or a triol.

[0012] The aliphatic polyol may be a 1,2-diol, a 1,3-diol, or a 1,2,3-triol.

[0013] The aliphatic polyol may be one or more selected from ethylene glycol, propylene glycol, 1,3-propylene glycol, glycerol, 1,3-butylene glycol, 1,2-butylene glycol, 2,3-butylene glycol, 3-amino-1,2-propylene glycol, 1,2-cyclohexanediol, and 1,2-cyclopentanediol.

[0014] The double metal cyanide catalyst composition may include a metal salt of the following Chemical Formula 1 and a metal cyanide complex salt of the following Chemical Formula 2:

[0015]

Chemical Formula 1

[0016] M 1 (X 1 ) p

[0017]

Chemical Formula 2

[0018] A 1 q M 2 M 3 r (CN)6

[0019] in,

[0020] M 1 is a Group 11 or Group 12 transition metal ion,

[0021] X 1 is a halogen, hydroxyl, sulfate, carbonate, carboxylate, oxalate or cyanide group,

[0022] A 1 is an alkali metal ion or an alkaline earth metal ion,

[0023] M 2 and M 3 are different from each other and are alkaline earth metal ions or Group 8, Group 9 or Group 10 transition metal ions,

[0024] p and q are each independently an integer of 1 or greater, and r is 0 or 1.

[0025] M 1 It can be Zn(II), Fe(II), Co(II) or Ni(II), X 1 It may be a halogen.

[0026] The metal salt may be zinc (II) chloride, zinc (III) chloride, zinc bromide or zinc iodide.

[0027] M 2 and M 3It may be, independently of one another, Ca(II), Co(II), Co(III), Fe(II), Fe(III), Cr(II), Ir(III) or Ni(II).

[0028] The metal cyanide complex salt may be potassium hexacyanocobaltate (III), potassium hexacyanoferrate (III), or potassium calcium ferrocyanide.

[0029] In another general form, a double metal cyanide catalyst prepared from a double metal cyanide catalyst composition is provided.

[0030] In another general form, a method for preparing a double metal cyanide catalyst includes: (a) preparing a double metal cyanide catalyst composition and reacting the composition, the composition including: a complexing agent including tert-butyl alcohol, a linear or cyclic (C2-C12) aliphatic polyol, and a polyalkylene glycol; a metal salt having the following chemical formula 1; and a metal cyanide complex salt having the following chemical formula 2; and (b) filtering and washing to obtain a double metal cyanide catalyst:

[0031]

Chemical Formula 1

[0032] M 1 (X 1 ) p

[0033]

Chemical Formula 2

[0034] A 1 q M 2 M 3 r (CN)6

[0035] in,

[0036] X 1 、M 1 、M 2 、M 3 、A 1 and p to r are as defined above.

[0037] In another general form, a method for preparing a polyether carbonate polyol includes: (a) preparing a double metal cyanide catalyst composition and reacting the composition, the composition comprising: a complexing agent comprising tert-butyl alcohol, a linear or cyclic (C2-C12) aliphatic polyol, and a polyalkylene glycol; a metal salt having the following chemical formula 1; and a metal cyanide complex salt having the following chemical formula 2; (b) filtering and washing to obtain a double metal cyanide catalyst; and (c) reacting an alkylene oxide with carbon dioxide in the presence of the double metal cyanide catalyst to obtain a polyether carbonate polyol:

[0038]

Chemical Formula 1

[0039] M 1 (X 1 ) p

[0040]

Chemical Formula 2

[0041] A 1 q M 2 M 3 r (CN)6

[0042] in,

[0043] X 1 、M 1 、M 2 、M 3 、A 1 and p to r are as defined above.

[0044] The polyether carbonate polyol may have a number average molecular weight of 200 g / mol to 10,000 g / mol.

[0045] In step (c), the catalytic activity calculated as the ratio of the weight of the polyol produced (kg-P) to the amount of the double metal cyanide catalyst used (g-cat) according to the polymerization time (h) may be 40 kg-P / g-cat.h.

[0046] Beneficial effects

[0047] Since the double metal cyanide catalyst of the exemplary embodiment includes tert-butyl alcohol and a linear or cyclic (C2-C12) aliphatic polyol as complexing agents, significantly improved catalytic activity can be achieved.

[0048] Specifically, when the double metal cyanide catalyst of the exemplary embodiment is applied to the polymerization reaction of polyether carbonate polyols, only a very small amount of catalyst is required to produce high-quality polymers. Furthermore, since almost no catalyst remains after the polymerization reaction, there is no need for further catalyst removal, thus simplifying the process. High-quality polyether carbonate polyols can be obtained even under mild reaction conditions, significantly improving production efficiency. DETAILED DESCRIPTION

[0049] In this specification, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by those skilled in the art. The terms used herein are only used to effectively describe a specific example and are not intended to limit the present invention.

[0050] Unless the context indicates otherwise, singular forms used in this specification may also include plural forms.

[0051] In addition, the numerical ranges used in this specification include all values within the range, including the lower limit and the upper limit, the increments logically derived from the form and span of the defined range, all double limits, and all possible combinations of the upper limit and the lower limit within the numerical range defined in different forms. Unless otherwise defined in this specification, values that may exceed the numerical range due to experimental errors or rounding of values are also included in the defined numerical range.

[0052] The term "comprising" in this specification is an open description, which is equivalent to terms such as "provided with", "including", "having", "is / has", "is / is characterized by", etc., and does not exclude elements, materials or methods not further listed.

[0053] The present invention is described in detail below.

[0054] Exemplary embodiments of the present invention provide a double metal cyanide catalyst having excellent catalytic activity in the polymerization reaction of polyether carbonate polyol and a preparation method thereof.

[0055] Specifically, the double metal cyanide catalyst composition of the exemplary embodiment is characterized by including tert-butyl alcohol, a linear or cyclic (C2-C12) aliphatic polyol, and a polyalkylene glycol as a complexing agent.

[0056] Since the complexing agent having the composition combination described above is used, the double metal cyanide catalyst according to the exemplary embodiment requires only a very small amount in the polymerization reaction of polyether carbonate polyol to produce a high-quality polymer.

[0057] For example, the complexing agent may include tert-butyl alcohol and an aliphatic polyol in a molar ratio of 1:0.1 to 0.9, specifically, a molar ratio of 1:0.2 to 1:0.8 or 1:0.2 to 1:0.6. When the above range is met, a double metal cyanide catalyst with better catalytic activity can be prepared, and thus it is preferred, but the present invention is not limited thereto.

[0058] The linear or cyclic (C2-C12) aliphatic polyol may be, for example, a linear (C2-C12) aliphatic polyol or a cyclic (C3-C10) aliphatic polyol. Specifically, it may be a linear or cyclic (C3-C8) aliphatic polyol or a cyclic (C3-C6) aliphatic polyol, and may be a linear or cyclic aliphatic compound containing two or more, specifically 2 to 4, hydroxyl groups (-OH).

[0059] The aliphatic polyol may be a diol or a triol, and as a non-limiting example, may be one or more selected from ethylene glycol, propylene glycol, 1,3-propylene glycol, glycerol, 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, 2,3-butanediol, 3-amino-1,2-propanediol, 1,2-cyclohexanediol, and 1,2-cyclopentanediol.

[0060] The aliphatic polyol may be 1,2-diol, 1,3-diol or 1,2,3-triol, and is preferably 1,2-diol.

[0061] 1,2-diol refers to a vicinal diol in which two hydroxyl groups are located on adjacent carbon atoms, as shown in the following chemical formula A. As non-limiting examples, it can be ethylene glycol, propylene glycol, 1,2-butanediol, 2,3-butanediol, 3-amino-1,2-propanediol, 1,2-cyclohexanediol, 1,2-cyclopentanediol, etc.:

[0062]

Chemical Formula A

[0063]

[0064] 1,3-diol refers to a compound with two hydroxyl groups located on carbon atoms 1 and 3, as shown in the following chemical formula B. As non-limiting examples, it can be 1,3-propylene glycol, 1,3-butanediol, etc.:

[0065]

Chemical Formula B

[0066]

[0067] 1,2,3-triol refers to a compound in which three hydroxyl groups are located on three adjacent carbon atoms, as shown in the following chemical formula C. As a non-limiting example, it may be glycerol:

[0068]

Chemical formula C

[0069]

[0070] The polyalkylene glycol may be a polymer having a number average molecular weight of 400 g / mol or greater, specifically, the number average molecular weight may be 400 g / mol to 5,000 g / mol, 400 g / mol to 3,000 g / mol, or 400 g / mol to 2,000 g / mol. Furthermore, the polyalkylene glycol may be polyethylene glycol, polypropylene glycol, or polybutylene glycol, but is not limited thereto. Specifically, the double metal cyanide catalyst composition of the exemplary embodiment may include the above-mentioned complexing agent, a metal salt, and a metal cyanide complex salt, wherein the metal salt is represented by the following chemical formula 1, and the metal cyanide complex salt may be represented by the following chemical formula 2:

[0071]

Chemical Formula 1

[0072] M 1 (X 1 ) p

[0073]

Chemical Formula 2

[0074] A 1 q M 2 M 3 r (CN)6

[0075] in,

[0076] M 1 is a Group 11 or Group 12 transition metal ion,

[0077] X 1 is a halogen, hydroxyl, sulfate, carbonate, carboxylate, oxalate or cyanide group;

[0078] A 1 is an alkali metal ion or an alkaline earth metal ion,

[0079] M 2 and M 3 are different from each other and are alkaline earth metal ions or Group 8, Group 9 or Group 10 transition metal ions,

[0080] p and q are each independently an integer of 1 or greater, and r is 0 or 1.

[0081] In Chemical Formula 1, p can be M 1 Charge value; M 1 Can be Zn, Fe, Co or Ni; X 1 Specifically, the metal salt represented by Chemical Formula 1 may be zinc (II) chloride (ZnCl2), zinc (III) chloride (ZnCl3), zinc bromide (ZnBr2) or zinc iodide (ZnI2), more specifically zinc (II) chloride.

[0082] In Chemical Formula 2, when r is 0, q can be 6-(M 2 charge value); when r is 1, q can be 6-(M 2 Charge value +M 3 charge value); M 2 and M 3 A may be independently Ca(II), Co(II), Co(III), Fe(II), Fe(III), Cr(II), Ir(III) or Ni(II); 1It can be an alkali metal ion. Specifically, the metal cyanide complex salt represented by Chemical Formula 2 can be potassium hexacyanocobaltate (III) (K3Co(CN)6), potassium hexacyanoferrate (III) (K3Fe(CN)6), or potassium calcium ferrocyanide (K2CaFe(CN)6), specifically potassium hexacyanocobaltate (III) (K3Co(CN)6) or potassium hexacyanoferrate (III) (K3Fe(CN)6).

[0083] Another exemplary embodiment of the present invention provides a method for preparing a double metal cyanide catalyst.

[0084] The method of preparing a double metal cyanide catalyst according to an exemplary embodiment may include:

[0085] (a) preparing a double metal cyanide catalyst composition and reacting the composition, the composition comprising: a complexing agent comprising tert-butyl alcohol, a linear or cyclic (C2-C12) aliphatic polyol and a polyalkylene glycol; a metal salt having the following chemical formula 1; and a metal cyanide complex salt having the following chemical formula 2; and

[0086] (b) filtering and washing to obtain a double metal cyanide catalyst:

[0087]

Chemical Formula 1

[0088] M 1 (X 1 ) p

[0089]

Chemical Formula 2

[0090] A 1 q M 2 M 3 r (CN)6

[0091] Among them, X 1 、M 1 、M 2 、M 3 、A 1 And p to r are as described above.

[0092] The descriptions of the linear or cyclic (C2-C12) aliphatic polyol, polyalkylene glycol, metal salt, and metal cyanide complex salt are already described above and are therefore omitted.

[0093] Specifically, the reaction of step (a) can be carried out at 30 to 100°C, 30 to 80°C, or 40 to 60°C for 30 minutes to 2 hours or 1 to 2 hours.

[0094] In step (b), an aqueous solution containing tert-butyl alcohol and polyalkylene glycol can be used as a washing solution, and after washing, the solvent is dried under reduced pressure to obtain a double metal cyanide catalyst. The drying temperature can be 50° C. to 100° C., 70° C. to 100° C., or 80° C. to 100° C., and the drying time can be 1 hour to 10 hours, 3 hours to 10 hours, or 5 hours to 20 hours.

[0095] In addition, another exemplary embodiment of the present invention provides a double metal cyanide catalyst prepared by the above preparation method, and a method for preparing a polyether carbonate polyol, which includes reacting alkylene oxide with carbon dioxide in the presence of the double metal cyanide catalyst to obtain the polyether carbonate polyol.

[0096] Specifically, the method for preparing a polyether carbonate polyol according to an exemplary embodiment may include: (a) preparing an aqueous solution and reacting the solution, the aqueous solution including: a complexing agent including tert-butyl alcohol, a linear or cyclic (C2-C12) aliphatic polyol, and a polyalkylene glycol; a metal salt having the following chemical formula 1; and a metal cyanide complex salt having the following chemical formula 2; (b) filtering and washing to obtain a double metal cyanide catalyst; and (c) reacting alkylene oxide with carbon dioxide in the presence of the double metal cyanide catalyst to obtain a polyether carbonate polyol:

[0097]

Chemical Formula 1

[0098] M 1 (X 1 ) p

[0099] A 1 q M 2 M 3 r (CN)6

[0100] in,

[0101] X 1 、M 1 、M 2 、M 3 、A 1 And p to r are as described above.

[0102] The double metal cyanide catalyst of the exemplary embodiment has excellent catalytic activity and can eliminate the need for catalyst removal. Specifically, when using the double metal cyanide catalyst of the exemplary embodiment, only a very small amount of catalyst is required to produce high-quality polyether carbonate polyols. Furthermore, since virtually no catalyst residue remains after the polymerization reaction, further catalyst removal is unnecessary, simplifying the process. High-quality polyether carbonate polyols can be obtained even under mild reaction conditions, significantly improving production efficiency.

[0103] Specifically, in step (c), based on the weight of the finally produced polyether carbonate polyol, the amount of the double metal cyanide catalyst used may be 400 ppm or less, 300 ppm or less, 200 ppm or less, 100 ppm or less, or 50 ppm or less, specifically 10 ppm to 400 ppm, 50 ppm to 300 ppm, or 100 ppm to 300 ppm, and may include all possible combinations of the upper and lower limits of these numerical ranges.

[0104] In addition, the double metal cyanide catalyst may be used in an amount of 0.001 to 0.1 parts by weight or 0.001 to 0.05 parts by weight based on 100 parts by weight of the alkylene oxide.

[0105] In step (c), the alkylene oxide may be ethylene oxide or propylene oxide, and the reaction of the alkylene oxide with carbon dioxide may be carried out at 50°C to 200°C, 70°C to 200°C, or 80°C to 150°C.

[0106] In addition, the reaction of step (c) can also be carried out by adding a chain transfer agent to the alkylene oxide and the carbon dioxide. The chain transfer agent is not limited as long as it is commonly used in the art, but as a non-limiting example, it can be a polyalkylene glycol, more specifically, it can be a polyalkylene glycol, polypropylene glycol or polybutylene glycol, but is not limited thereto. In addition, the number average molecular weight of the polyalkylene glycol used as the chain transfer agent can be 50 g / mol to 2,000 g / mol, 50 g / mol to 1,000 g / mol, 100 g / mol to 1,000 g / mol or 100 g / mol to 500 g / mol, but is not limited thereto.

[0107] Under the above polymerization conditions, the catalytic activity calculated as the ratio of the weight of the polyol produced (kg-P) to the amount of the double metal cyanide catalyst used (g-cat) can be 1 kg-P / g-cat.h to 40 kg-P / g-cat.h or 3 kg-P / g-cat.h to 40 kg-P / g-cat.h, depending on the polymerization time (h).

[0108] The polyether carbonate polyol obtained by the preparation method may have a number average molecular weight of 200 to 10,000 g / mol, 200 to 5,000 g / mol, 300 to 5,000 g / mol, or 400 to 3,000 g / mol, but is not necessarily limited thereto.

[0109] The above exemplary embodiments will be described in detail below through the following examples. However, the following examples are only for illustration and do not limit the scope of rights.

[0110] The physical properties of the examples are measured as follows:

[0111] 1) Molecular weight and dispersity

[0112] The analysis was performed using gel permeation chromatography (GPC). The analysis was performed on an Agilent 1260 Infinity II high temperature GPC instrument, using polystyrene as the standard substance, tetrahydrofuran as the solvent, and an Agilent PSSSDV 500A o The chromatographic column is 3 μm 8×300 mm and the temperature is 40°C.

[0113] 2) Catalytic activity

[0114] Based on the polymerization time (h), the catalytic activity was calculated as the ratio of the weight of the polyether carbonate polyol produced (kg-P) to the amount of double metal cyanide catalyst used (g-cat), with the unit being kg-P / g-cat.h.

[0115] [Example 1]

[0116] Preparation of Double Metal Cyanide Catalyst (DMC)

[0117] The double metal cyanide catalyst of Example 1 was prepared using tert-butanol and 2,3-butanediol in a molar ratio of 1:0.5 as a complexing agent.

[0118] Specifically, 6.5g of ZnCl2, 3.4g of tert-butanol and 2.1g of 2,3-butanediol were dissolved in 24.0g of distilled water. In another reaction vessel, 0.65g of K3Co(CN)6 was dissolved in 8.0g of distilled water, and the mixed solution was added dropwise to the ZnCl2 solution while stirring within 10 minutes. After the addition was completed, a mixed solution prepared by dissolving 0.14g of tert-butanol and 0.69g of polypropylene glycol (molecular weight: 1,000g / mol) in 6.5g of distilled water was added dropwise, and the addition was completed within 10 minutes to prepare a double metal cyanide catalyst composition. After the addition was completed, the reaction was stirred for 90 minutes. The entire reaction was carried out at 50°C. Subsequently, the white slurry product was filtered to obtain a white solid product. The product was dispersed in a mixed solvent of 15 g of distilled water, 29 g of tert-butyl alcohol, and 0.6 g of polypropylene glycol (molecular weight: 1,000 g / mol), stirred and washed, and then filtered. The washing was repeated twice. Next, the white product was dispersed in 40 g of tert-butyl alcohol, stirred for 20 minutes, and then filtered to obtain a white product. The solvent was then removed by reaction under reduced pressure at 60°C for 8 hours to obtain the double metal cyanide catalyst of Example 1.

[0119] Preparation of polyether carbonate polyols

[0120] 6.0 mg of the DMC catalyst prepared in Example 1 above, 20 g of propylene oxide and 50 g of polypropylene glycol (molecular weight: 400 g / mol) as a chain transfer agent were added to a 600 mL reactor and stirred. The reactor was heated to 110 ° C to polymerize propylene oxide. The internal temperature was observed to rise, and when the internal pressure dropped to 1 bar, the reactor was cooled to room temperature. Subsequently, 150 g of propylene oxide was added to the reactor, the carbon dioxide gas was pressurized to 18 bar, and the reactor was heated to 115 ° C. During the polymerization reaction, the pressure in the reactor gradually decreased, and when the pressure dropped to 35 bar, the polymerization reaction was completed. After the reaction was completed, the reactor was cooled with an ice bath, and all the carbon dioxide gas in the reactor was discharged. The product was dried in a vacuum drying oven at 80 ° C. The physical properties of the product are shown in Table 1 below. The carbon dioxide content in the obtained polyether carbonate polyol was determined by the method described in Korean Patent Publication No. 10-2022-0111266A.

[0121] [Example 2]

[0122] This method is the same as Example 1, except that, when preparing the DMC catalyst composition, the total amount of tert-butanol and 2,3-butanediol is the same, but the molar ratio is changed from 1:0.5 to 1:0.2.

[0123] [Example 3]

[0124] This method is the same as Example 1, except that propylene glycol is used instead of 2,3-butanediol when preparing the DMC catalyst composition.

[0125] [Example 4]

[0126] This method is the same as Example 1, except that 1,2-cyclohexanediol is used instead of 2,3-butanediol when preparing the DMC catalyst composition.

[0127] [Example 5]

[0128] This method is the same as Example 1, except that, when preparing the DMC catalyst composition, the total amount of tert-butanol and 2,3-butanediol is the same, but the molar ratio is changed from 1:0.5 to 1:1.0.

[0129] [Example 6]

[0130] This method is the same as Example 1, except that 1,3-propylene glycol is used instead of 2,3-butanediol when preparing the DMC catalyst composition.

[0131] [Example 7]

[0132] This method is the same as Example 1, except that 3-amino-1,2-propanediol is used instead of 2,3-butanediol when preparing the DMC catalyst composition.

[0133] [Comparative Example 1]

[0134] This method is the same as Example 1, except that 2,3-butanediol is not used in preparing the DMC catalyst composition.

[0135]

Table 1

[0136]

[0137] As shown in Table 1, the DMC catalysts in the examples of the present invention significantly improved catalytic activity, demonstrating that high-quality polymers can be produced using only minimal amounts of catalyst. Furthermore, according to one exemplary embodiment of the present invention, since virtually no catalyst remains after the polymerization reaction (approximately 50 ppm or less), further catalyst removal is unnecessary, simplifying the process. High-quality polyether carbonate polyols can be obtained even under mild reaction conditions, and thus production efficiency is expected to be significantly improved.

[0138] Although the present invention has been described above through specific matters and exemplary embodiments, these descriptions are only used to help a comprehensive understanding of the present invention, and the present invention is not limited to these exemplary embodiments. Those skilled in the art can make various modifications and changes based on these descriptions.

[0139] Therefore, the spirit of the present invention should not be limited to the above-described exemplary embodiments, and the following claims and all modifications equivalent to or equivalent to the claims are intended to fall within the scope and spirit of the present invention.

Claims

1. A double metal cyanide catalyst composition comprising: tert-Butanol, linear or cyclic (C2-C12) aliphatic polyols, and polyalkylene glycols as complexing agents.

2. The double metal cyanide catalyst composition according to claim 1, wherein The complexing agent includes tert-butyl alcohol and aliphatic polyol in a molar ratio of 1:0.1 to 0.

9.

3. The double metal cyanide catalyst composition according to claim 1, wherein The aliphatic polyol is a diol or a triol.

4. The double metal cyanide catalyst composition according to claim 3, wherein The aliphatic polyol is 1,2-diol, 1,3-diol or 1,2,3-triol.

5. The double metal cyanide catalyst composition according to claim 4, wherein The aliphatic polyol is one or more selected from ethylene glycol, propylene glycol, 1,3-propylene glycol, glycerol, 1,3-butylene glycol, 1,2-butylene glycol, 2,3-butylene glycol, 3-amino-1,2-propylene glycol, 1,2-cyclohexanediol and 1,2-cyclopentanediol.

6. The double metal cyanide catalyst composition according to claim 1, wherein The double metal cyanide catalyst composition comprises a metal salt of the following Chemical Formula 1 and a metal cyanide complex salt of the following Chemical Formula 2: 【Chemical Formula 1】 M 1 (X 1 ) p 【Chemical Formula 2】 From 1 q M 2 M 3 r (CN)6 in, M 1 is a Group 11 or Group 12 transition metal ion, X 1 is a halogen, hydroxyl, sulfate, carbonate, carboxylate, oxalate or cyanide group, A 1 is an alkali metal ion or an alkaline earth metal ion, M 2 and M 3 are different from each other and are alkaline earth metal ions or Group 8, Group 9 or Group 10 transition metal ions, p and q are each independently an integer of 1 or greater, and r is 0 or 1.

7. The double metal cyanide catalyst composition according to claim 6, wherein M 1 is Zn(II), Fe(II), Co(II) or Ni(II), X 1 It is a halogen.

8. The double metal cyanide catalyst composition according to claim 6, wherein The metal salt is zinc (II) chloride, zinc (III) chloride, zinc bromide or zinc iodide.

9. The double metal cyanide catalyst composition according to claim 6, wherein M 2 and M 3 independently of one another are Ca(II), Co(II), Co(III), Fe(II), Fe(III), Cr(II), Ir(III) or Ni(II).

10. The double metal cyanide catalyst composition according to claim 6, wherein The metal cyanide complex salt is potassium hexacyanocobaltate (III), potassium hexacyanoferrate (III) or potassium calcium ferrocyanide. 11 . A double metal cyanide catalyst prepared from the double metal cyanide catalyst composition according to claim 1 .

12. A method for preparing a double metal cyanide catalyst, comprising: (a) preparing a double metal cyanide catalyst composition and reacting the composition, the composition comprising: a complexing agent comprising tert-butyl alcohol, a linear or cyclic (C2-C12) aliphatic polyol and a polyalkylene glycol; a metal salt having the following chemical formula 1; and a metal cyanide complex salt having the following chemical formula 2; and (b) filtering and washing to obtain a double metal cyanide catalyst, 【Chemical Formula 1】 M 1 (X 1 ) p 【Chemical Formula 2】 From 1 q M 2 M 3 r (CN)6 in, X 1 、M 1 、M 2 、M 3 、A 1 and p to r are as defined in claim 6.

13. A method for preparing a polyether carbonate polyol, comprising: (a) preparing a double metal cyanide catalyst composition and reacting the composition, wherein the composition includes: a complexing agent including tert-butyl alcohol, a linear or cyclic (C2-C12) aliphatic polyol and a polyalkylene glycol; a metal salt having the following chemical formula 1; and a metal cyanide complex salt having the following chemical formula 2; (b) filtering and washing to obtain a double metal cyanide catalyst; and (c) reacting alkylene oxide with carbon dioxide in the presence of the double metal cyanide catalyst to obtain a polyether carbonate polyol, 【Chemical Formula 1】 M 1 (X 1 ) p 【Chemical Formula 2】 From 1 q M 2 M 3 r (CN)6 in, X 1 、M 1 、M 2 、M 3 、A 1 and p to r are as defined in claim 6.

14. The method for preparing polyether carbonate polyol according to claim 13, wherein: The polyether carbonate polyol has a number average molecular weight of 200 g / mol to 10,000 g / mol.

15. The method for preparing polyether carbonate polyol according to claim 13, wherein: The catalytic activity calculated as the ratio of the weight of the polyol produced (kg-P) to the amount of the double metal cyanide catalyst used (g-cat) is in the range of 1 kg-P / g-cat.h to 40 kg-P / g-cat.h, depending on the polymerization time (h) in step (c).

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