A bimetallic catalyst for polyurethane synthesis reaction and polyurethane composition and preparation method and application thereof

Abstract

The application relates to the technical field of new materials, and discloses a bimetallic catalyst for polyurethane synthesis reaction, a polyurethane composition of the bimetallic catalyst, and a preparation method and application of the bimetallic catalyst. The structure of the bimetallic catalyst is shown in formula (1). The preparation method of the bimetallic catalyst comprises the following steps: step 1) adding raw material A and an organic solvent into a reactor, and heating and keeping the temperature constant to 45-50 DEG C under the protection of a nitrogen atmosphere; step 2) adding a metal alcoholate solution dropwise into the raw material A solution for reflux reaction; and step 3) obtaining the bimetallic catalyst through product reduced pressure distillation, cooling and extraction of the distillation residue, etc. The bimetallic catalyst can significantly reduce the adverse phenomena such as bubbles, scales and bubbling during the synthesis reaction process of the polyurethane material, reduce the waste product rate of the polyurethane product, shorten the demolding time of the polyurethane material, and improve the production efficiency; and the bimetallic catalyst can be used in various application fields of the synthesized polyurethane material, including elastomers, coatings, adhesives, sealants, foams and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new materials, in particular to a bimetallic catalyst for polyurethane synthesis reaction, a polyurethane composition thereof, and a preparation method and application thereof. BACKGROUND

[0002] Polyurethane polymer material products are widely used, and China has become the world's largest polyurethane production base. The application of polyurethane materials is developing rapidly. Based on the advantages of low carbon, low energy consumption, environmental protection and safety, and product performance, the semi-prepolymer method of normal temperature curing combination material is used in the synthesis process of polyurethane materials. The process has the advantages of close ratio, easy process control, flexible formula, stable quality, low energy consumption and high efficiency. In the process of synthesis and processing, catalysts are needed to achieve appropriate gel time and faster curing time.

[0003] The best catalysts used in this process are organic heavy metal mercury and lead catalysts, and emerging organic bismuth and zinc catalysts. However, organic metal mercury and lead catalysts are highly toxic and can easily pollute the environment. They need to be protected when used, which is cumbersome and potentially harmful to personnel. Organic bismuth and zinc catalysts still have strong catalytic effects on water and isocyanate reactions, which can cause polyurethane products to have bubbles, scales, and bubbles, resulting in high scrap rates. On the other hand, the catalytic effect of organic bismuth and zinc catalysts on the later reaction of polyurethane materials is significantly weakened, resulting in long demolding time and low production efficiency.

[0004] The prior art discloses a reaction-type low-volatile beta dicarbonyl coordination metal catalyst and a preparation method thereof. The hydroxyl group contained in the molecular structure of the catalyst can chemically react with isocyanate, the main reaction material of polyurethane, and can be embedded in the high polymer chain segment. In the formed high polymer material, it is not in a free state and does not affect the volatile matter content of the high polymer material due to the presence of free catalysts. SUMMARY

[0005] In view of the above technical problems, the present application provides a bimetallic catalyst for polyurethane synthesis reaction and a preparation method thereof.

[0006] Another object of the present application is to provide a method for preparing a polyurethane composition using the bimetallic catalyst and a polyurethane composition thereof.

[0007] Another object of the present application is to provide a bimetallic catalyst for polyurethane synthesis reaction and a preparation method thereof.

[0008] The present application achieves the above objects by the following technical solutions:

[0009] A bimetallic catalyst for polyurethane synthesis reaction, the structural formula of which is shown as formula (1):

[0010]

[0011] wherein R1 is a C3 alkyl group;

[0012] R2 and R3 are the same or different and comprise a C1-C20 alkyl, alkoxy or aralkyl substituted alkyl group;

[0013] R4 is a C2-C3 alkyl group;

[0014] n1 is 2 to 3;

[0015] n2 is 1 to 4;

[0016] m is 0 to 2;

[0017] Me1 is selected from the group of metal ions consisting of Bi, Zn, Fe or Ni;

[0018] Me2 is selected from the group of metal ions consisting of Ti, Al, Mg or Li.

[0019] Preferably, in formula (1),

[0020] R1 is a C3 isoalkyl group;

[0021] R2 is -CH3 and R3 is -O-C2H5;

[0022] R4 is a C3 isoalkyl group;

[0023] n1 is 2 to 3;

[0024] n2 is 1 to 4;

[0025] m is 0 to 2;

[0026] Me1 is Bi or Zn;

[0027] Me2 is: Ti, Al.

[0028] Preferably, in formula (1), Me1 is Bi; R1 is a C3 alkyl group; R2 is -CH3 and R3 is -O-C2H5; n1 = 3; n2 is 1 to 4; Me2 is Ti; R4 is a C3 isoalkyl group; and m is 0 to 1.

[0029] When n2 = 1, m = 1, having the chemical structure:

[0030]

[0031] In formula (1), a is set to b is CH3(CH3)CH2O-; (1) is abbreviated as: (b)(Ti)(a)3(Bi);

[0032] When n2=2, m=0, then (Chem. 2) is simplified as: (Ti)(a)4(a-H) 2( Bi)2;

[0033] When n2=3, m=0, then (Chem. 3) is simplified as: (Ti)(a)4(a-H) 5( Bi)3;

[0034] When n2=4, m=0, then (Chem. 4) is simplified as: (Ti)(a)4(a-H)8(Bi)4.

[0035] Preferably, in formula (1), Me1is Bi; R1is C3alkyl; R2is -CH3and R3is -O-C2H5; n1=3; n2 is 1-3; Me2is Al; m=0;

[0036] When n2=1, m=0, has the following chemical structure:

[0037]

[0038] (Chem. 5) is simplified as: (Al)(a)3(Bi);

[0039] When n2=2, then (Chem. 6) is simplified as: (Al)(a)3(a-H)3(Bi)2;

[0040] When n2=3, then (Chem. 7) is simplified as: (Al)(a)3(a-H)6(Bi)3.

[0041] Preferably, in formula (1),

[0042] Me1is Zn; R1is C3alkyl; R2is -CH3and R3is -O-C2H5; n1=2; n2 is 1-4; Me2is Ti; R4is C3isoalkyl; m is 0-2.

[0043] When n2=1, m=2, has the following chemical structure:

[0044]

[0045] (Chem. 8) is simplified as: (b)2(Ti)(a)2(Zn);

[0046] When n2=2, m=0, then (Chem. 9) is simplified as: (Ti)(a)4(Zn)2;

[0047] When n2=3, m=0, then (Chem. 10) is simplified as: (Ti)(a)4(a-H)2(Zn)3;

[0048] When n2=4, m=0, then (Chem. 11) is simplified as: (Ti)(a)4(a-H)4(Zn)4.

[0049] Preferably, in formula (1),

[0050] Me1 is Zn; R1 is C3 alkyl; R2 is -CH3 and R3 is -O-C2H5; n1 = 2; n2 is 1-3; Me2 is Al; R4 is C3 isomeric alkyl; m is 0-1.

[0051] When n2 = 1, m = 1, and the chemical structure is as follows:

[0052]

[0053] (Chemical formula 12) is abbreviated as: (b) (Al) (a) 2 (Zn);

[0054] When n2 = 2, m = 0, and (Chemical formula 13) is abbreviated as: (Al) (a) 3 (a-H) (Zn) 2.

[0055] When n2 = 3, m = 0, and (Chemical formula 14) is abbreviated as: (Al) (a) 3 (a-H) 3 (Zn) 3.

[0056] A preparation method of the bimetallic catalyst for polyurethane synthesis reaction, the reaction formula is as follows:

[0057]

[0058] In the formula:

[0059] A is a raw material;

[0060] The metal alkoxide; n4 = n3 - m.

[0061] Preferably, the preparation method of the bimetallic catalyst for polyurethane synthesis reaction comprises the following steps:

[0062] Step 1), a raw material A and an appropriate amount of organic solvent are added to a reactor, protected by a nitrogen atmosphere, the raw material A is dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0063] Step 2), under stirring, the metal alkoxide solution is slowly added dropwise into the raw material A solution, refluxed, and the metal alkoxide and the raw material A are subjected to ester exchange reaction;

[0064] The molar ratio of the raw material A to the metal alkoxide is 1-4:1;

[0065] The organic solvent is ethanol, isopropyl alcohol or toluene;

[0066] The dropping time of the metal alkoxide solution is 1-2 hours, and the reflux reaction time is 5-8 hours; the temperature control during the reflux reaction is 60-80℃;

[0067] Step 3), the product is subjected to reduced pressure distillation at 80-100℃ and a vacuum degree of -(0.095-0.1) MPa, the solvent and the reaction byproduct alcohol are collected, the distillation residue is cooled to room temperature, extracted with petroleum ether, recrystallized, filtered and rotary evaporated to obtain the bimetallic catalyst for polyurethane synthesis reaction.

[0068] Preferably, the metal ion contained in the raw material A is selected from Bi, Zn, Fe or Ni; preferably, selected from Bi and Zn.

[0069] Preferably, the metal alkoxide is a metal alkoxide of Ti, Al, Mg or Li. Preferably, selected from a metal alkoxide of Ti and Al.

[0070] Preferably, the titanium alkoxide is titanium tetraisopropoxide, titanium tetraisopropanol, titanium tetraisopropoxide, titanium tetraisopropoxide, etc. Preferably, titanium tetraisopropoxide.

[0071] Preferably, the aluminum alkoxide is aluminum triisopropoxide, aluminum triisopropoxide, aluminum triisopropoxide; preferably, aluminum triisopropoxide.

[0072] The molar ratio of raw material A to metal alkoxide is determined according to the coordination valence state of the metal ion and the content requirements of the two metals. Preferably, the molar ratio of raw material A to metal alkoxide is:

[0073] 1) The metal ion contained in the raw material A is Bi, and the metal alkoxide is titanium tetraisopropoxide:

[0074] The molar ratio of raw material A to titanium tetraisopropoxide is 1:1, and the product is (Chemical 1)

[0075] The molar ratio of raw material A to titanium tetraisopropoxide is 2:1, and the product is (Chemical 2)

[0076] The molar ratio of raw material A to titanium tetraisopropoxide is 3:1, and the product is (Chemical 3)

[0077] The molar ratio of raw material A to titanium tetraisopropoxide is 4:1, and the product is (Chemical 4)

[0078] 2) The metal ion contained in the raw material A is Bi, and the metal alkoxide is aluminum triisopropoxide:

[0079] The molar ratio of raw material A to aluminum triisopropoxide is 1:1, and the product is (Chemical 5)

[0080] The molar ratio of the raw material A to the aluminum triisopropoxide is 2:1, and the product is (Chemical Formula 6)

[0081] The molar ratio of the raw material A to the aluminum triisopropoxide is 3:1, and the product is (Chemical Formula 7)

[0082] 3) The metal ion contained in the raw material A is Zn, and the metal alcoholate is titanium tetraisopropoxide:

[0083] The molar ratio of the raw material A to the titanium tetraisopropoxide is 1:1, and the product is (Chemical Formula 8)

[0084] The molar ratio of the raw material A to the titanium tetraisopropoxide is 2:1, and the product is (Chemical Formula 9)

[0085] The molar ratio of the raw material A to the titanium tetraisopropoxide is 3:1, and the product is (Chemical Formula 10)

[0086] The molar ratio of the raw material A to the titanium tetraisopropoxide is 4:1, and the product is (Chemical Formula 11)

[0087] 4) The metal ion contained in the raw material A is Zn, and the metal alcoholate is aluminum triisopropoxide:

[0088] The molar ratio of the raw material A to the aluminum triisopropoxide is 1:1, and the product is (Chemical Formula 12)

[0089] The molar ratio of the raw material A to the aluminum triisopropoxide is 2:1, and the product is (Chemical Formula 13)

[0090] The molar ratio of the raw material A to the aluminum triisopropoxide is 3:1, and the product is (Chemical Formula 14)

[0091] The use of the bimetallic catalyst for the polyurethane synthesis reaction in the preparation of a polyurethane composition.

[0092] The method for preparing a polyurethane composition using the bimetallic catalyst, comprising the following steps:

[0093] Step a. Preparation of I component:

[0094] Mix the oligomer polyol and diisocyanate, stir and deaerate; the reaction temperature is 60-85℃, and the reaction time is 2-4 hours;

[0095] Step b. Preparation of P component:

[0096] Mix the oligomer polyol, chain extender and the bimetallic catalyst, stir and deaerate;

[0097] Step c. Preparation of a polyurethane composition:

[0098] The P component is mixed with the I component in a mass ratio I:P = 100:65-85, stirred uniformly, and then poured into a preheated mold to vulcanize and form.

[0099] Preferably, in the method of preparing the polyurethane composition, the I component is prepared from the following ingredients in parts by weight:

[0100] oligomeric polyol 30-90 parts;

[0101] diisocyanate 10-100 parts;

[0102] The P component is prepared from the following ingredients in parts by weight:

[0103] oligomeric polyol 30-95 parts;

[0104] chain extender 5-100 parts;

[0105] catalyst 0.05-0.5 parts.

[0106] Further preferably, in the method of preparing the polyurethane composition, the I component is prepared from the following ingredients in parts by weight:

[0107] oligomeric polyol 50-70 parts;

[0108] diisocyanate 30-50 parts;

[0109] The P component is prepared from the following ingredients in parts by weight:

[0110] oligomeric polyol 60-95 parts;

[0111] chain extender 5-50 parts;

[0112] catalyst 0.05-0.5 parts.

[0113] Preferably, the oligomeric polyol is a polyether polyol having a molecular weight of 400-5000 or a polyester polyol having a molecular weight of 1000-3000 or a mixture of the foregoing.

[0114] Preferably, the polyether polyol is selected from polytetrahydrofuran diol or polyoxypropylene diol.

[0115] Preferably, the polyester polyol is one or more of polycaprolactone diol, polyethylene adipate diol, polyhexylene adipate diol, or polyethylene adipate diethylene glycol.

[0116] Preferably, the diisocyanate is one or more of toluene diisocyanate (TDI), 4,4' (or 2,4)-toluene methane diisocyanate (MDI), carbodiimide-modified MDI, polymeric MDI (PAPI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (HMDI), or 1,5-naphthalene diisocyanate (NDI).

[0117] Preferably, the chain extender is selected from one or more of di-o-chloro-diphenylamine methane (MOCA), diethyl toluene diamine (DETDA), dimethylthio toluene diamine (DMTDA), 1,4 butanediol, or 1,6 hexanediol.

[0118] A polyurethane composition prepared by the above method.

[0119] Compared with the prior art, the beneficial effects of the present application are embodied in:

[0120] In the catalytic polyurethane material synthesis curing reaction process, through the respective catalytic characteristics and coordinated co-catalysis of the two different metals in the bimetallic coordination catalyst of the present application, the target reaction of the active groups of the polyurethane material is catalyzed, the orderly reaction is promoted, and a high-performance polyurethane synthetic material is formed.

[0121] The catalyst of the present application can significantly reduce the adverse phenomena such as bubbles, scales, and bubbling that are prone to occur in the synthesis reaction process of polyurethane materials, reduce the waste rate in the production process of polyurethane products, shorten the demolding time of polyurethane materials, improve the production efficiency, and significantly improve the physical strength such as tensile breaking strength and elongation at break.

[0122] The catalyst of the present application is green and environmentally friendly, does not contain highly toxic heavy metals, and is used in various application fields of synthetic polyurethane materials, including elastomers, coatings, adhesives, sealants, foams, etc. DETAILED DESCRIPTION

[0123] The embodiments of the technical solutions of the present application will be described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be the usual meanings understood by the skilled in the art to which the present application belongs. Unless otherwise specified, the reagents, methods and equipment used in the present application are conventional reagents, methods and equipment in the technical field. Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0124] Raw material A: as disclosed in the prior art "CN114524914A Reaction-type low-volatile beta dicarbonyl coordination metal catalyst and its preparation method" and prepared according to the related method.

[0125] Example 1

[0126] This example provides the preparation of a bimetallic catalyst (Formula 1) for polyurethane synthesis reaction.

[0127] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 77.1 g of raw material A containing Bi metal and 100 g of toluene were added, protected by a nitrogen atmosphere, completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0128] Under stirring, 28.4 g of titanium tetraisopropoxide was slowly added into the above reactor through a dropping funnel, and refluxed to react the titanium tetraisopropoxide with the raw material A. There was a temperature rise during the dropping process, and the reaction temperature was controlled at 60-80°C. The dropping time of the titanium tetraisopropoxide was 1-2 h, and the reflux reaction time was 6 h;

[0129] The product was vacuum distilled at 80-100°C and a vacuum degree of -(0.095-0.1) MPa to collect the solvent toluene and the reaction byproduct isopropyl alcohol. The remaining distillate was cooled to room temperature, extracted with petroleum ether, recrystallized, filtered, and rotary evaporated to obtain 87.4 g of yellow-white viscous solid product, a bimetallic catalyst (Formula 1) for polyurethane synthesis reaction.

[0130] Example 2

[0131] This example provides the preparation of a bimetallic catalyst (Formula 2) for polyurethane synthesis reaction.

[0132] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 154.1 g of raw material A containing Bi metal and 200 g of ethanol were added, protected by a nitrogen atmosphere, completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0133] Under stirring, 28.4 g of titanium tetraisopropoxide was slowly added into the above reactor through a dropping funnel, and refluxed to react the titanium tetraisopropoxide with the raw material A. There was a temperature rise during the dropping process, and the reaction temperature was controlled at 60-80°C. The dropping time of the titanium tetraisopropoxide was 1-2 h, and the reflux reaction time was 6 h;

[0134] The product was subjected to vacuum distillation at 80-100°C and a vacuum of 0.095-0.1 MPa, and the solvent toluene and the reaction by-product isopropyl alcohol were collected. The remaining distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 158.5 g of a yellow solid product, a bimetallic catalyst (Formula 2) for a polyurethane synthesis reaction.

[0135] Example 3

[0136] This example provides the preparation of a bimetallic catalyst (Formula 3) for a polyurethane synthesis reaction.

[0137] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 231.2 g of raw material A containing Bi metal and 300 g of toluene were added, protected by a nitrogen atmosphere, and completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0138] In a stirred state, 28.4 g of titanium tetraisopropoxide was slowly added dropwise into the above reactor using a dropping funnel, and refluxed to allow the titanium tetraisopropoxide to undergo an ester exchange reaction with the raw material A. There was a temperature rise during the dropwise addition process, and the reaction process temperature was controlled to be 60-80°C, the dropwise addition time of the titanium tetraisopropoxide was 1-2 h, and the reflux reaction time was 8 h;

[0139] The product was subjected to vacuum distillation at 80-100°C and a vacuum of 0.095-0.1 MPa, and the solvent toluene and the reaction by-product isopropyl alcohol were collected. The remaining distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 158.5 g of a yellow solid product, a bimetallic catalyst (Formula 2) for a polyurethane synthesis reaction.

[0140] Example 4

[0141] This example provides the preparation of a bimetallic catalyst (Formula 4) for a polyurethane synthesis reaction.

[0142] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 308.3 g of raw material A containing Bi metal and 400 g of toluene were added, protected by a nitrogen atmosphere, and completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0143] In a stirred state, 28.4 g of titanium tetraisopropoxide was slowly added dropwise into the above reactor using a dropping funnel, and refluxed to allow the titanium tetraisopropoxide to undergo an ester exchange reaction with the raw material A. There was a temperature rise during the dropwise addition process, and the reaction process temperature was controlled to be 60-80°C, the dropwise addition time of the titanium tetraisopropoxide was 1-2 h, and the reflux reaction time was 8 h;

[0144] The product was subjected to vacuum distillation at 80-100°C and a vacuum of -(0.095-0.1) MPa, the solvent toluene and the reaction byproduct isopropyl alcohol were collected, the distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 312.5 g of yellow solid product, a bimetallic catalyst (Formula 3) for a polyurethane synthesis reaction.

[0145] Example 5

[0146] This example provides the preparation of a bimetallic catalyst (Formula 5) for a polyurethane synthesis reaction.

[0147] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 77.1 g of raw material A containing Bi metal and 100 g of isopropyl alcohol were added, protected by a nitrogen atmosphere, completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0148] While stirring, 20.4 g of aluminum triisopropylate was dissolved in 70 g of toluene, the aluminum triisopropylate solution was slowly added to the above reactor through a dropping funnel, and refluxed to allow the aluminum triisopropylate to undergo an ester exchange reaction with the raw material A. There was a temperature rise during the addition process, the reaction process temperature was controlled at 60-80°C, the aluminum triisopropylate solution was added for 1-2 h, and the reflux reaction time was 6 h;

[0149] The product was subjected to vacuum distillation at 80-100°C and a vacuum of -(0.095-0.1) MPa, the solvent toluene and the reaction byproduct isopropyl alcohol were collected, the distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 312.5 g of yellow solid product, a bimetallic catalyst (Formula 3) for a polyurethane synthesis reaction.

[0150] Example 6

[0151] This example provides the preparation of a bimetallic catalyst (Formula 5) for a polyurethane synthesis reaction.

[0152] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 77.1 g of raw material A containing Bi metal and 100 g of isopropyl alcohol were added, protected by a nitrogen atmosphere, completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0153] While stirring, 20.4 g of aluminum triisopropylate was dissolved in 70 g of toluene, the aluminum triisopropylate solution was slowly added to the above reactor through a dropping funnel, and refluxed to allow the aluminum triisopropylate to undergo an ester exchange reaction with the raw material A. There was a temperature rise during the addition process, the reaction process temperature was controlled at 60-80°C, the aluminum triisopropylate solution was added for 1-2 h, and the reflux reaction time was 6 h;

[0154] The product was subjected to vacuum distillation at 80-100°C and a vacuum of 0.095-0.1 MPa, and the solvent toluene and the reaction byproduct isopropyl alcohol were collected. The remaining distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 156.5 g of a yellow-white solid product, a bimetallic catalyst (Formula 6) for a polyurethane synthesis reaction.

[0155] Example 7

[0156] This example provides the preparation of a bimetallic catalyst (Formula 7) for a polyurethane synthesis reaction.

[0157] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 231.2 g of raw material A containing Bi metal and 300 g of toluene were added, and the mixture was completely dissolved into a transparent homogeneous liquid under nitrogen atmosphere protection and heated to a constant temperature of 45-50°C;

[0158] While stirring, 20.4 g of aluminum triisopropoxide was dissolved in 70 g of toluene, and the aluminum triisopropoxide solution was slowly added to the above reactor through a dropping funnel. The reaction was carried out under reflux, and the ester exchange reaction between aluminum triisopropoxide and raw material A was carried out. The temperature increased during the dropping process, and the reaction temperature was controlled at 60-80°C. The dropping time of aluminum triisopropoxide was 1-2 h, and the reflux reaction time was 6 h.

[0159] The product was subjected to vacuum distillation at 80-100°C and a vacuum of 0.095-0.1 MPa, and the solvent toluene and the reaction byproduct isopropyl alcohol were collected. The remaining distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 156.5 g of a yellow-white solid product, a bimetallic catalyst (Formula 7) for a polyurethane synthesis reaction.

[0160] Example 8

[0161] This example provides the preparation of a bimetallic catalyst (Formula 8) for a polyurethane synthesis reaction.

[0162] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 44 g of raw material A containing Zn metal and 100 g of toluene were added, and the mixture was completely dissolved into a transparent homogeneous liquid under nitrogen atmosphere protection and heated to a constant temperature of 45-50°C;

[0163] While stirring, 28.4 g of titanium tetraisopropoxide was slowly added to the above reactor through a dropping funnel, and the reaction was carried out under reflux. The ester exchange reaction between titanium tetraisopropoxide and raw material A was carried out. The temperature increased during the dropping process, and the reaction temperature was controlled at 60-80°C. The dropping time of titanium tetraisopropoxide was 1-2 h, and the reflux reaction time was 6 h.

[0164] The product was subjected to vacuum distillation at 80-100°C and a vacuum of 0.095-0.1 MPa, and the solvent toluene and the reaction by-product isopropyl alcohol were collected. The remaining distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 60.3 g of a white sticky solid product, a bimetallic catalyst (Formula 8) for a polyurethane synthesis reaction.

[0165] Example 9

[0166] This example provides the preparation of a bimetallic catalyst (Formula 9) for a polyurethane synthesis reaction.

[0167] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 88 g of raw material A containing Zn metal and 200 g of toluene were added, protected by a nitrogen atmosphere, and completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0168] In a stirred state, 28.4 g of titanium tetraisopropoxide was slowly added dropwise into the above reactor using a dropping funnel, and refluxed to allow the titanium tetraisopropoxide to undergo an ester exchange reaction with the raw material A. There was a temperature rise during the dropwise addition, and the reaction process temperature was controlled to be 60-80°C, the dropwise addition time of the titanium tetraisopropoxide was 1-2 h, and the reflux reaction time was 6 h;

[0169] The product was subjected to vacuum distillation at 80-100°C and a vacuum of 0.095-0.1 MPa, and the solvent toluene and the reaction by-product isopropyl alcohol were collected. The remaining distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 92.3 g of a white sticky solid product, a bimetallic catalyst (Formula 9) for a polyurethane synthesis reaction.

[0170] Example 10

[0171] This example provides the preparation of a bimetallic catalyst (Formula 10) for a polyurethane synthesis reaction.

[0172] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 131.9 g of raw material A containing Zn metal and 300 g of toluene were added, protected by a nitrogen atmosphere, and completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0173] In a stirred state, 28.4 g of titanium tetraisopropoxide was slowly added dropwise into the above reactor using a dropping funnel, and refluxed to allow the titanium tetraisopropoxide to undergo an ester exchange reaction with the raw material A. There was a temperature rise during the dropwise addition, and the reaction process temperature was controlled to be 60-80°C, the dropwise addition time of the titanium tetraisopropoxide was 1-2 h, and the reflux reaction time was 8 h;

[0174] The product was subjected to vacuum distillation at 80-100°C and a vacuum of 0.095-0.1 MPa, and the solvent toluene and the reaction byproduct isopropyl alcohol were collected. The remaining distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 136.3 g of a white sticky solid product, a bimetallic catalyst (Formula 10) for a polyurethane synthesis reaction.

[0175] Example 11

[0176] This example provides the preparation of a bimetallic catalyst (Formula 11) for a polyurethane synthesis reaction.

[0177] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 175.9 g of raw material A containing Zn metal and 400 g of toluene were added, and the mixture was completely dissolved into a transparent homogeneous liquid under nitrogen atmosphere protection, and then heated and kept at a constant temperature of 45-50°C;

[0178] In a stirred state, 28.4 g of titanium tetraisopropoxide was slowly added dropwise into the above reactor through a dropping funnel, and a reflux reaction was performed to allow the titanium tetraisopropoxide to perform an ester exchange reaction with the raw material A. There was a temperature rise during the dropwise addition process, and the reaction process temperature was controlled to be 60-80°C, the dropwise addition time of the titanium tetraisopropoxide was 1-2 h, and the reflux reaction time was 8 h;

[0179] The product was subjected to vacuum distillation at 80-100°C and a vacuum of 0.095-0.1 MPa, and the solvent toluene and the reaction byproduct isopropyl alcohol were collected. The remaining distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 136.3 g of a white sticky solid product, a bimetallic catalyst (Formula 10) for a polyurethane synthesis reaction.

[0180] Example 12

[0181] This example provides the preparation of a bimetallic catalyst (Formula 12) for a polyurethane synthesis reaction.

[0182] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 175.9 g of raw material A containing Zn metal and 400 g of toluene were added, and the mixture was completely dissolved into a transparent homogeneous liquid under nitrogen atmosphere protection, and then heated and kept at a constant temperature of 45-50°C;

[0183] In a stirred state, 28.4 g of titanium tetraisopropoxide was slowly added dropwise into the above reactor through a dropping funnel, and a reflux reaction was performed to allow the titanium tetraisopropoxide to perform an ester exchange reaction with the raw material A. There was a temperature rise during the dropwise addition process, and the reaction process temperature was controlled to be 60-80°C, the dropwise addition time of the titanium tetraisopropoxide was 1-2 h, and the reflux reaction time was 8 h;

[0184] The product was subjected to vacuum distillation at 80-100°C and a vacuum of -(0.095-0.1) MPa, the solvent toluene and the reaction byproduct isopropyl alcohol were collected, the distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 52.3 g of a white sticky solid product, a bimetallic catalyst (Compound 12) for a polyurethane synthesis reaction.

[0185] Example 13

[0186] This example provides the preparation of a bimetallic catalyst (Compound 13) for a polyurethane synthesis reaction.

[0187] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 88 g of raw material A containing Zn metal and 200 g of toluene were added, protected under a nitrogen atmosphere, and completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0188] While stirring, 20.4 g of aluminum triisopropylate was dissolved in 70 g of toluene, the aluminum triisopropylate solution was slowly added to the above reactor through a dropping funnel, and refluxed to allow the aluminum triisopropylate to undergo an ester exchange reaction with the raw material A. There was a temperature increase during the addition process, the reaction process temperature was controlled to be 60-80°C, the aluminum triisopropylate solution was added for 1-2 h, and the reflux reaction time was 6 h;

[0189] The product was subjected to vacuum distillation at 80-100°C and a vacuum of -(0.095-0.1) MPa, the solvent toluene and the reaction byproduct isopropyl alcohol were collected, the distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered, and rotary evaporated to obtain 90.3 g of a white sticky solid product, a bimetallic catalyst (Compound 13) for a polyurethane synthesis reaction.

[0190] Example 14

[0191] This example provides the preparation of a bimetallic catalyst (Compound 14) for a polyurethane synthesis reaction.

[0192] In a reactor equipped with a stirrer, a thermometer, and a condenser reflux device, 131.9 g of raw material A containing Zn metal and 300 g of toluene were added, protected under a nitrogen atmosphere, and completely dissolved into a transparent homogeneous liquid, and heated to a constant temperature of 45-50°C;

[0193] While stirring, 20.4 g of aluminum triisopropylate was dissolved in 70 g of toluene, the aluminum triisopropylate solution was slowly added to the above reactor through a dropping funnel, and refluxed to allow the aluminum triisopropylate to undergo an ester exchange reaction with the raw material A. There was a temperature increase during the addition process, the reaction process temperature was controlled to be 60-80°C, the aluminum triisopropylate solution was added for 1-2 h, and the reflux reaction time was 6 h;

[0194] The product was subjected to reduced pressure distillation at 80-100°C and a vacuum degree of -(0.095-0.1) MPa, the solvent toluene and the reaction by-product isopropyl alcohol were collected, the distillation residue was cooled to room temperature, extracted with petroleum ether, recrystallized, suction filtered and rotary evaporated to obtain 134.3 g of white sticky solid product, a bimetallic catalyst (Formula 14) for a polyurethane synthesis reaction.

[0195] Example 15

[0196] This example provides the application of a bimetallic catalyst for a polyurethane synthesis reaction. A method for preparing a polyurethane composition using the above bimetallic catalyst includes the following steps:

[0197] (1) 34.25 g of toluene diisocyanate (TDI-80) and 65.75 g of a polyether polyol with a molecular weight of 1000 and a functionality of 2 were mixed and reacted, the reaction temperature was controlled at 85°C, the reaction time was 2 hours, and after vacuum degassing, the product was cooled and discharged as a polyurethane resin I component;

[0198] (2) 65 g of a polyether polyol with a molecular weight of 2000 and a functionality of 2, and 35 g of a chain extender, methylene dianiline (MOCA), were heated and mixed uniformly, and after vacuum water removal and cooling, the product was used as a polyurethane resin P component.

[0199] (3) 0.14 g of the bimetallic catalyst (Formula 1-7) for a polyurethane synthesis reaction in the above Examples 1-7 was added to each independent P component, heated to 60°C, stirred and dissolved uniformly, degassed, and then mixed with the I component at a mass ratio of I:P = 100:72, quickly stirred uniformly, and then poured into a mold preheated to 80°C for vulcanization and molding at 80°C.

[0200] (4) The mixed polyurethane materials numbered 1-7 obtained by adding the bimetallic catalyst (Formula 1-7) for a polyurethane synthesis reaction in the above Examples 1-7, respectively.

[0201] Example 16

[0202] This example provides the application of a bimetallic catalyst for a polyurethane synthesis reaction. A method for preparing a polyurethane composition using the above bimetallic catalyst includes the following steps:

[0203] (1) 34.25 g of toluene diisocyanate (TDI-80) and 65.75 g of a polyether polyol with a molecular weight of 1000 and a functionality of 2 were mixed and reacted, the reaction temperature was controlled at 85°C, the reaction time was 2 hours, and after vacuum degassing, the product was cooled and discharged as a polyurethane resin I component;

[0204] (2) 65 g of polyether polyol with a molecular weight of 2000 and a functionality of 2, 35 g of chain extender di-o-chloro-diamine methane (MOCA) were heated and mixed uniformly, and after vacuum water removal and cooling, used as the polyurethane resin P component.

[0205] (3) 0.07 g of the above-mentioned Example 1 (Chem. 1) and 0.07 g of the above-mentioned Example 8-14 (Chem. 8-14) bimetallic catalysts for polyurethane synthesis reaction were combined respectively, and added to the respective independent P components, heated to 60°C, stirred and dissolved uniformly, defoamed, and mixed with the I component at a mass ratio of I:P = 100:72, and then poured into a mold preheated to 80°C, and vulcanized and formed at 80°C.

[0206] (4) The above-mentioned mixed polyurethane material numbers 8-14, which were added with the bimetallic catalysts (Chem. 1) and (Chem. 8-14) for polyurethane synthesis reaction respectively.

[0207] Comparative Example 1

[0208] This example provides an application comparison of bimetallic catalysts for polyurethane synthesis reaction.

[0209] (1) 34.25 g of toluene diisocyanate (TDI-80) and 65.75 g of polyether polyol with a molecular weight of 1000 and a functionality of 2 were mixed and reacted, with the reaction temperature controlled at 85°C and the reaction time controlled at 2 hours, and after vacuum defoaming, the product was discharged and cooled, used as the polyurethane resin I component;

[0210] (2) 65 g of polyether polyol with a molecular weight of 2000 and a functionality of 2, 35 g of di-o-chloro-diamine methane (MOCA) were heated and mixed uniformly, and after vacuum water removal and cooling, used as the polyurethane resin P component.

[0211] (3) 0.14 g of lead isooctoate was added to the independent P component, heated to 60°C, stirred and mixed uniformly, defoamed, and mixed with the I component at a mass ratio of I:P = 100:72, and then poured into a mold preheated to 80°C, and vulcanized and formed at 80°C.

[0212] (4) The above-mentioned mixed polyurethane material number 15, which was added with lead isooctoate.

[0213] Comparative Example 2

[0214] This example provides an application comparison of bimetallic catalysts for polyurethane synthesis reaction.

[0215] (1) 34.25 g of toluene diisocyanate (TDI-80) and 65.75 g of polyether polyol with a molecular weight of 1000 and a functionality of 2 were mixed and reacted, the reaction temperature was controlled at 85°C, the reaction time was 2 hours, and after vacuum degassing, the product was cooled and discharged as polyurethane resin I component;

[0216] (2) 65 g of polyether polyol with a molecular weight of 2000 and a functionality of 2 and 35 g of methylene bisorthochloroaniline (MOCA) were heated and mixed uniformly, and after vacuum water removal and cooling, the product was used as polyurethane resin P component.

[0217] (3) 0.14 g of bismuth neodecanoate was added to the separate P component, heated to 60°C, stirred and mixed uniformly, degassed, and then mixed with the I component at a mass ratio of I:P = 100:72, quickly stirred uniformly, and then poured into a mold preheated to 80°C, and vulcanized and formed at 80°C.

[0218] (4) The mixed polyurethane material with bismuth neodecanoate added above is No. 16.

[0219] Comparative Example 3

[0220] This example provides a comparison of the application of bimetallic catalysts for polyurethane synthesis reactions.

[0221] (1) 34.25 g of toluene diisocyanate (TDI-80) and 65.75 g of polyether polyol with a molecular weight of 1000 and a functionality of 2 were mixed and reacted, the reaction temperature was controlled at 85°C, the reaction time was 2 hours, and after vacuum degassing, the product was cooled and discharged as polyurethane resin I component;

[0222] (2) 65 g of polyether polyol with a molecular weight of 2000 and a functionality of 2 and 35 g of methylene bisorthochloroaniline (MOCA) were heated and mixed uniformly, and after vacuum water removal and cooling, the product was used as polyurethane resin P component.

[0223] (3) 0.07 g of lead isooctoate and 0.07 g of zinc neodecanoate were added to the separate P component, heated to 60°C, stirred and mixed uniformly, degassed, and then mixed with the I component at a mass ratio of I:P = 100:72, quickly stirred uniformly, and then poured into a mold preheated to 80°C, and vulcanized and formed at 80°C.

[0224] (4) The mixed polyurethane material with a combination of lead isooctoate and zinc neodecanoate added above is No. 17.

[0225] Comparative Example 4

[0226] This example provides a comparison of the application of bimetallic catalysts for polyurethane synthesis reactions.

[0227] (1) 34.25 g of toluene diisocyanate (TDI-80) and 65.75 g of polyether polyol with a molecular weight of 1000 and a functionality of 2 were mixed and reacted, the reaction temperature was controlled at 85°C, the reaction time was 2 hours, and the mixture was discharged after vacuum degassing and cooled, serving as the polyurethane resin I component;

[0228] (2) 65 g of polyether polyol with a molecular weight of 2000 and a functionality of 2 and 35 g of methylene dianiline (MOCA) were heated and uniformly mixed, and after vacuum water removal and cooling, served as the polyurethane resin P component.

[0229] (3) 0.07 g of bismuth neodecanoate and 0.07 g of zinc neodecanoate were added to the P component separately, heated to 60°C, stirred and uniformly mixed, degassed, and then mixed with the I component at a mass ratio of I:P = 100:72, quickly stirred uniformly, and then poured into a mold preheated to 80°C, and vulcanized and formed at 80°C.

[0230] (4) The polyurethane material No. 18 was obtained by adding the combination of bismuth neodecanoate and zinc neodecanoate as described above.

[0231] The catalysts used in the above Comparative Examples 1-4, i.e., lead isooctoate, bismuth neodecanoate, and zinc neodecanoate, were all produced by Guangzhou Yourun Synthetic Materials Co., Ltd., wherein the lead content in the lead isooctoate was 20%, the bismuth content in the bismuth neodecanoate was 20%, and the zinc content in the zinc neodecanoate was 19%.

[0232] The polyurethane material numbers obtained by combining the above Example 1-16 and Comparative Example 1-4 methods are shown in Table 1.

[0233] The gel time, molding time, appearance, and mechanical properties of the polyurethane materials synthesized and vulcanized according to the above Example 1-16 and Comparative Example 1-4 methods are shown in Table 2. Among them, the Shore hardness was tested according to GB / T 531.1-2008; the tensile properties were tested according to GB / T 528-2009; and the tear strength was tested according to GB / T 529-2008.

[0234] Example 17

[0235] This example provides the application of a bimetallic catalyst for polyurethane synthesis reaction. A method for preparing a polyurethane composition using the above bimetallic catalyst, comprising the following steps:

[0236] (1) The diisocyanate and the oligomer polyol were mixed and reacted, the reaction temperature and reaction time were controlled, the mixture was discharged after vacuum degassing and cooled, and served as the polyurethane resin I component;

[0237] (2) The oligomer polyol and the chain extender were heated and uniformly mixed, and after vacuum water removal and cooling, served as the polyurethane resin P component.

[0238] (3) The bimetallic catalyst for polyurethane synthesis reaction of the above-mentioned example 1 was added to each independent P component respectively, and heated to 60 DEG C to stir and dissolve uniformly, defoaming, then mixed with I component according to the mass ratio according to table 3, stirred uniformly after quickly, poured into the mold preheated to 80 DEG C, and vulcanized to form at 80 DEG C.

[0239] (4) The mixed polyurethane material numbers 19-22 of the above-mentioned bimetallic catalyst (chemical 1) for polyurethane synthesis reaction were added respectively.

[0240] The polyurethane material numbers combined according to the above-mentioned example 17 method were shown in table 3.

[0241] The polyurethane material gel time, forming time, appearance, mechanical property comparison of the synthesis and vulcanization according to the above-mentioned example 17 method were shown in table 4. Among them, the shore hardness was tested according to GB / T 531.1-2008; the tensile property was tested according to GB / T 528-2009; and the tear strength was tested according to GB / T 529-2008.

[0242] Table 1 polyurethane material number table combined according to the method of examples 1-16 and comparative examples 1-4

[0243]

[0244]

[0245] Table 2 analysis table of different catalysts on the same polyurethane material curing process and appearance, mechanical property after curing

[0246]

[0247] As shown in table 2, the bismuth neodecanoate catalyst has insufficient targeted catalytic characteristics, and catalyzes the reaction of water and isocyanate at the same time of catalyzing the reaction of hydroxyl and isocyanate, which easily causes the product to have scales, cracks and other phenomena, affects the mechanical property of the material, and has short gel time and slow post-curing, which affects the production efficiency. The organic bismuth zinc catalyst can accelerate the post-curing speed after compounding, but still cannot avoid the participation of water in the reaction, and the product is easy to have scales and cracks, and the mechanical property is not high. The lead catalyst has good effect of not catalyzing the reaction of trace water, but its targeted catalytic property is still insufficient, and it also catalyzes the formation of urethine at the same time of catalyzing the reaction of hydroxyl and isocyanate, which leads to low hardness and low mechanical property of the polyurethane material after curing.

[0248] The bimetallic catalyst for polyurethane synthesis reaction of the application has remarkable targeted catalytic effect, the product has transparent appearance, no foaming, no scale and crack defects, and excellent mechanical property of the material; and the catalyst combination number 8 has the best comprehensive performance in the comparison of various indexes.

[0249] Table 3 Polyurethane material number table according to Example 17

[0250]

[0251] Table 4 Polyurethane material curing process and appearance and mechanical property analysis table after curing according to Example 17

[0252]

[0253] As shown in Table 4, the bimetallic catalyst prepared according to the application for polyurethane synthesis reaction can exhibit excellent performance in various polyurethane raw material systems, and can impart excellent appearance and mechanical properties to the polyurethane material. The polyurethane IP material has long operation time after mixing, fast molding demolding, and the polyurethane product has transparent appearance, no foaming, no scale crack and other defects. When applied to the actual production of polyurethane material, the waste rate can be greatly reduced, the production cost can be reduced, and the production efficiency can be improved.

[0254] The above examples are only used to illustrate the technical solutions of the application, but not to limit it; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application.

Claims

1. A bimetallic catalyst for polyurethane synthesis reaction, characterized in that, Its structural formula is shown in equation (1): Equation (1), In the formula, R1 is a C3 alkyl group; R2 and R3 may be the same or different, including C1-C20 alkyl, alkoxy or aralkyl-substituted alkyl; R4 is a C2-C3 alkyl group; n1 is 2~3; n2 is 1~4; m is 0~2 Me1 is selected from the following metal ions: Bi, Zn, Fe or Ni; Me2 is selected from the following metal ions: Ti, Al, Mg or Li.

2. The bimetallic catalyst for polyurethane synthesis reaction according to claim 1, characterized in that, In equation (1), R1 is a C3 isoalkyl group; R2 is -CH3, R3 is -O-C2H5; R4 is a C3 isoalkyl group; n1 is 2~3; n2 is 1~4; m is 0~2; Me1 is either Bi or Zn; Me2 consists of Ti and Al.

3. The bimetallic catalyst for polyurethane synthesis reaction according to claim 2, characterized in that, In equation (1), Me1 is Bi; R1 is a C3 isoalkyl group; R2 is -CH3 and R3 is -O-C2H5; n1=3; n2 is 1~4; Me2 is Ti; R4 is a C3 isoalkyl group; m is 0~1; Alternatively, Me1 is Bi; R1 is a C3 isoalkyl group; R2 is -CH3 and R3 is -O-C2H5; n1=3; n2 is 1~3; Me2 is Al; m=0; Alternatively, Me1 is Zn; R1 is a C3 isoalkyl group; R2 is -CH3 and R3 is -O-C2H5; n1=2; n2 is 1~4; Me2 is Ti; R4 is a C3 isoalkyl group; m is 0~2; Alternatively, Me1 is Zn; R1 is a C3 isoalkyl group; R2 is -CH3 and R3 is -O-C2H5; n1=2; n2 is 1~3; Me2 is Al; R4 is a C3 isoalkyl group; m is 0~1.

4. The method for preparing the bimetallic catalyst for polyurethane synthesis reaction according to any one of claims 1 to 3, characterized in that, Includes the following steps: Step 1): Add raw material A and an appropriate amount of organic solvent to the reactor, under nitrogen atmosphere protection, so that raw material A dissolves into a transparent homogeneous liquid, and heats it to a constant temperature of 45~50℃. Step 2), under stirring, the metal alkoxide solution is slowly added dropwise to the raw material A solution, and the reaction is refluxed to allow the metal alkoxide to undergo an ester exchange reaction with the raw material A; The molar ratio of raw material A to metal alkoxide is 1~4:1; The organic solvent is ethanol, isopropanol, or toluene; The metal alkoxide solution is added dropwise over 1-2 hours, and the reflux reaction time is 5-8 hours; the temperature during the reflux reaction is controlled at 60-80℃. Step 3), the product is distilled under reduced pressure at 80~100℃ and -(0.095~0.1)MPa, the solvent and reaction byproduct alcohol are collected, the distillation residue is cooled to room temperature, extracted with petroleum ether, recrystallized, filtered and rotary evaporated to obtain the bimetallic catalyst used for polyurethane synthesis reaction. The raw material A is .

5. The method for preparing the bimetallic catalyst for polyurethane synthesis reaction according to claim 4, characterized in that, The metal ions contained in raw material A are selected from Bi, Zn, Fe or Ni; The metal alkoxide is a metal alkoxide of Ti, Al, Mg or Li.

6. The application of the bimetallic catalyst for polyurethane synthesis reaction according to any one of claims 1 to 3 in the preparation of polyurethane compositions.

7. A method for preparing a polyurethane composition using the bimetallic catalyst according to any one of claims 1 to 3, characterized in that, Includes the following steps: Step a. Preparation of component I: The oligomeric polyol and diisocyanate are mixed and reacted, stirred and degassed; the reaction temperature is 60~85℃ and the reaction time is 2~4 hours. Step b. Preparation of component P: The oligomeric polyol, chain extender, and bimetallic catalyst are mixed, stirred, and degassed. Step c. Preparation of polyurethane composition: Mix component P and component I at a mass ratio of I:P = 100:65~85, stir evenly, and then pour into a preheated mold for vulcanization.

8. The method for preparing a polyurethane composition according to claim 7, characterized in that, Component I is prepared from the following components in parts by weight: 30-90 parts of oligomeric polyols; 10-100 parts of diisocyanate; The P component is prepared from the following components in parts by weight: 30-95 parts of oligomeric polyols; Chain extender 5-100 parts; Catalyst 0.1-0.5 parts.

9. A polyurethane composition prepared by the method according to any one of claims 7 to 8.

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