Vibration and noise reduction polyurethane elastic material and manufacturing method thereof

Abstract

The invention discloses a vibration and noise reduction polyurethane elastic material which is prepared from the following components in percentage by mass: 40.5 to 70.5 weight percent of oligomer polyol, 20.5 to 30.5 weight percent of polyisocyanate, 4.2 to 4.5 weight percent of chain extender, 0.05 to 0.08 weight percent of catalyst, 3.1 to 5 weight percent of emulsifier, 4 to 8 weight percent of foaming agent, 2.5 to 5 weight percent of pore opening agent and 3 to 6.42 weight percent of pigment. By adding the foaming agent and the pore opening agent in a proper ratio, the density of the prepared polyurethane elastic material is reduced, the dynamic and static compression stiffness ratio of the polyurethane elastic material is 1-1.5, and the stiffness difference of an elastomer base plate is small under the action of static pressure and dynamic pressure; therefore, vibration and noise in the driving process of the automobile can be effectively reduced, and the driving and riding comfort of the automobile is improved.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane materials, in particular to a vibration-reducing and noise-reducing polyurethane elastic material and a manufacturing method thereof. Background Art

[0002] Polyurethane material is a commonly used material with a wide range of uses. It can replace rubber, plastic and nylon, etc., and is used in airports, hotels, building materials, automobile factories, coal mines, cement plants, high-end apartments, villas, landscaping, colored stone art and parks. With the popularization of new energy vehicles, polyurethane elastic materials have received extensive attention. Polyurethane elastic materials have the advantages of good elasticity, large deformation and good impact resistance, and are mainly used as shock-proof rubber, air flow regulators and filter materials. However, the existing polyurethane elastic materials have poor vibration and noise reduction performance, resulting in large vibration and noise inside the new energy vehicle during driving, which leads to poor driving and riding comfort for people inside the new energy vehicle. However, existing car users are more concerned about the driving vibration and noise of the car, which results in the inability of existing polyurethane elastic materials to meet the high standards of vibration and noise reduction of new energy vehicles. Summary of the invention

[0003] The purpose of the present invention is to provide a method to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a vibration-damping and noise-reducing polyurethane elastic material, the material formula of which is composed of the following components in mass percentage: 40.5-70.5wt% of oligomer polyol, 20.5-30.5wt% of polyisocyanate, 4.2-4.5wt% of chain extender, 0.05-0.08wt% of catalyst, 3.1-5wt% of emulsifier, 4-8wt% of foaming agent, 2.5-5wt% of pore opener, and 3-6.42wt% of pigment.

[0005] Furthermore, the preparation method of the chain extender is as follows: S1: weigh 50-60g of diethylene glycol, and add 3-5g of potassium hydroxide to the diethylene glycol; S2: dropwise add 21-25g of ethylene oxide to the mixed solution of diethylene glycol and potassium hydroxide to carry out polymerization reaction, and obtain polyether polyol oligomers after the reaction is completed; S3: use the polyether polyol oligomers as mother liquor, use 0.5-0.65g of double metal cyanide complex as catalyst, add 3-3.5g of propylene oxide to initiate reaction, and after initiation, continuously add 15-18g of dihydroxymethylpropionic acid, 20-25g of ethylene oxide and 3-3.5g of propylene oxide to carry out ring-opening polymerization reaction to obtain the target product chain extender.

[0006] Furthermore, the pore opener includes one or more of an organic pore opener and an inorganic pore opener.

[0007] Furthermore, the foaming agent includes one or more of a carbon dioxide foaming agent, a hydrogenated chlorofluorocarbon foaming agent, a hydrogenated fluoroalkane foaming agent, 2,2'-azobisisobutyronitrile, diisopropyl azodicarboxylate and diethyl azodicarboxylate.

[0008] Furthermore, the boiling point of the foaming agent is 16°C to 75°C.

[0009] Furthermore, the catalyst includes one or more of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine, trimethylbenzylamine, dimethylethanolamine and morpholine.

[0010] A method for manufacturing a vibration-reducing and noise-reducing polyurethane elastic material comprises the following steps:

[0011] Step S1, raw material preparation: weigh and prepare the raw materials according to the raw material components required by the preparation process, and the weighed raw materials include: 40.5-70.5wt% of oligomer polyol, 20.5-30.5wt% of polyisocyanate, 4.2-4.5wt% of chain extender, 0.05-0.08wt% of catalyst, 3.1-5wt% of emulsifier, 4-8wt% of foaming agent, 2.5-5wt% of pore opener, and 3-6.42wt% of pigment;

[0012] Step S2, prepolymerization: 40.5-70.5 wt% of oligomer polyol and 20.5-30.5 wt% of polyisocyanate are added to a reaction kettle at room temperature and pressure, and the reaction kettle is opened and stirred at 50-80° C. for 3-5 hours;

[0013] Step S3, catalytic reaction: adding 0.05-0.08 wt% of a catalyst to the reactor in step S2 for catalytic reaction, thereby improving the reaction efficiency and obtaining a prepolymer;

[0014] Step S4, dispersion and emulsification: adding 3.1-5 wt% of emulsifier to the prepolymer obtained in step S3, and emulsifying the prepolymer by 3.1-5 wt% of emulsifier, so that the prepolymer is dispersed in water under the action of shear force;

[0015] Step S5, chain extension reaction: adding 4.2-4.5 wt% of chain extender to the mixture obtained in step S4, wherein 4.2-4.5 wt% of chain extender rapidly promotes the chain growth reaction of the mixture to generate high molecular weight polyurethane;

[0016] Step S6, foaming and opening cells: adding 4-8wt% of a foaming agent and 2.5-5wt% of a cell opening agent to the high molecular weight polyurethane obtained in step S5, wherein the 4-8wt% of the foaming agent and the 2.5-5wt% of the cell opening agent allow the high molecular weight polyurethane to open cells quickly, thereby increasing the number of pores generated inside the high molecular weight polyurethane;

[0017] Step S7, coloring: adding 3-6.42 wt% of pigment to the polyurethane obtained in step S6 for coloring, so as to obtain the required vibration-damping and noise-reducing polyurethane elastic material.

[0018] Furthermore, when adding 3.1-5 wt % of the emulsifier in step S4, the temperature needs to be kept below 50° C., and the emulsifier needs to be added continuously and evenly within 20-30 minutes.

[0019] Furthermore, after step S7 is completed, cooling water is introduced into the jacket of the reaction flask, and the cold water is waited to cool the polyurethane material. The temperature of the polyurethane material is measured in real time during the cooling process. After the cooling water cools the obtained polyurethane material to 30-40° C., nitrogen needs to be introduced into the reaction flask. After the nitrogen is introduced, the vibration-damping and noise-reducing polyurethane elastic material is passed through a filter. The filter can filter the polyurethane material, thereby removing impurities in the polyurethane material. Finally, the polyurethane material is pressed into a packaging product and packaged into a finished vibration-damping and noise-reducing polyurethane elastic material.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the density of the prepared polyurethane elastic material is reduced by adding a foaming agent and a cell-opening agent in a suitable ratio, and the dynamic-static compression stiffness ratio of the polyurethane elastic material can be made between 1 and 1.5, and the stiffness of the elastic pad is not much different when static pressure and dynamic pressure act, thereby effectively reducing the vibration and noise of the car during driving and improving the driving and riding comfort of the car. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] The invention provides a vibration-damping and noise-reducing polyurethane elastic material, wherein the material formula consists of the following components in percentage by mass: 56.15 wt% of oligomer polyol, 25.5 wt% of polyisocyanate, 4.2 wt% of chain extender, 0.05 wt% of catalyst, 3.1 wt% of emulsifier, 5 wt% of foaming agent, 3 wt% of pore opener and 3 wt% of pigment.

[0024] The oligomer polyol is specifically a polyether polyol, and the components of the polyether polyol are: ethylene oxide, propylene oxide, tetrahydrofuran monomer, KOH and amine, and the specific gravity is: 40 parts of ethylene oxide, 30 parts of propylene oxide, 20 parts of tetrahydrofuran monomer, 5 parts of KOH and 5 parts of diethylamine.

[0025] The cell opener is specifically polybutadiene.

[0026] The foaming agent comprises a mixture of a carbon dioxide foaming agent, a hydrogenated chlorofluorocarbon foaming agent, a hydrogenated fluoroalkane foaming agent and diethyl azodicarboxylate, and the mixing weight ratio of the carbon dioxide foaming agent, the hydrogenated chlorofluorocarbon foaming agent, the hydrogenated fluoroalkane foaming agent and diethyl azodicarboxylate is 1:1:1:1.

[0027] The catalyst comprises a mixture of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine and morpholine, and the mixing weight ratio of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine and morpholine is 1:1:1:1:1.

[0028] The preparation method of the chain extender is as follows: S1: weigh 50g of diethylene glycol, and add 3g of potassium hydroxide to the diethylene glycol; S2: drop 21g of ethylene oxide into a mixture of diethylene glycol and potassium hydroxide to carry out a polymerization reaction, and obtain a polyether polyol oligomer after the reaction is completed; S3: use the polyether polyol oligomer as a mother liquor, use 0.5g of potassium sodium double metal cyanide complex as a catalyst, add 3g of propylene oxide to carry out an initiation reaction, and after initiation, continuously add 15g of dihydroxymethylpropionic acid, 20g of ethylene oxide, 3g of propylene oxide and a ring-opening polymerization reaction to obtain a target product, the chain extender.

[0029] The emulsifier is specifically fatty alcohol polyoxyethylene ether.

[0030] A method for manufacturing a vibration-reducing and noise-reducing polyurethane elastic material comprises the following steps:

[0031] Step S1, raw material preparation: weigh and prepare the raw materials according to the raw material components required by the preparation process;

[0032] Step S2, prepolymerization: 56.15 wt% of oligomer polyol and 25.5 wt% of polyisocyanate are added into a reaction kettle at room temperature and pressure, and the reaction kettle is opened and stirred at 50° C. for 3 hours;

[0033] Step S3, catalytic reaction: adding 0.05 wt% of a catalyst to the reactor in step S2 for catalytic reaction, thereby improving the reaction efficiency and obtaining a prepolymer;

[0034] Step S4, dispersion and emulsification: adding 3.1 wt% of emulsifier to the prepolymer obtained in step S3, and emulsifying the prepolymer with 3.1 wt% of emulsifier, so that the prepolymer is dispersed in water under the action of shear force;

[0035] Step S5, chain extension reaction: adding 4.2 wt% of a chain extender to the mixture obtained in step S4, wherein 4.2 wt% of the chain extender rapidly promotes the chain extension reaction of the mixture to generate a high molecular weight polyurethane;

[0036] Step S6, foaming and opening cells: adding 5wt% of a foaming agent and 3wt% of a cell-opening agent to the high molecular weight polyurethane obtained in step S5, wherein the 5wt% of the foaming agent and the 3wt% of the cell-opening agent allow the interior of the high molecular weight polyurethane to open cells quickly, thereby increasing the generation of a large number of pores inside the high molecular weight polyurethane;

[0037] Step S7, coloring: adding 3 wt% of pigment to the polyurethane obtained in step S6 for coloring, and obtaining the required vibration-damping and noise-reducing polyurethane elastic material.

[0038] When adding 3.1 wt % of the emulsifier in step S4, the temperature needs to be kept below 50° C., and the emulsifier needs to be added continuously and evenly within 20 minutes.

[0039] After step S7 is completed, cooling water is introduced into the jacket of the reactor, and the cold water is waited to cool the polyurethane material. The temperature of the polyurethane material is measured in real time during the cooling process. After the cooling water cools the obtained polyurethane material to 30° C., nitrogen needs to be introduced into the reactor. After the nitrogen is introduced, the vibration-damping and noise-reducing polyurethane elastic material is passed through a filter. The filter can filter the polyurethane material, thereby removing impurities in the polyurethane material. Finally, the polyurethane material is pressed into a packaging product and packaged into a finished vibration-damping and noise-reducing polyurethane elastic material.

[0040] Example 2

[0041] The difference from Example 1 is that the present invention provides a technical solution, and the material formula consists of the following components in percentage by mass: 50.53wt% of oligomer polyol, 27.5wt% of polyisocyanate, 4.4wt% of chain extender, 0.07wt% of catalyst, 4wt% of emulsifier, 6wt% of foaming agent, 3.5wt% of pore opener, and 4wt% of pigment.

[0042] The oligomer polyol is specifically a polyether polyol, and the components of the polyether polyol are: ethylene oxide, propylene oxide, tetrahydrofuran monomer, KOH and amine, and the specific gravity is: 40 parts of ethylene oxide, 30 parts of propylene oxide, 20 parts of tetrahydrofuran monomer, 5 parts of KOH and 5 parts of diethylamine.

[0043] The pore opening agent is specifically fatty alcohol polyoxyethylene ether.

[0044] The foaming agent comprises a mixture of a carbon dioxide foaming agent, a hydrogenated chlorofluorocarbon foaming agent, a hydrogenated fluoroalkane foaming agent, 2,2'-azobisisobutyronitrile and diethyl azodicarboxylate, and the mixing weight ratio of the carbon dioxide foaming agent, the hydrogenated chlorofluorocarbon foaming agent, the hydrogenated fluoroalkane foaming agent, 2,2'-azobisisobutyronitrile and diethyl azodicarboxylate is 1:1:1:1:1.

[0045] The catalyst comprises a mixture of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine, trimethylbenzylamine and morpholine, and the mixing weight ratio of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine, trimethylbenzylamine and morpholine is 1:1:1:1:1:1:1.

[0046] The preparation method of the chain extender is as follows: S1: weigh 55g of diethylene glycol, and add 4g of potassium hydroxide to the diethylene glycol; S2: drop 23g of ethylene oxide into a mixture of diethylene glycol and potassium hydroxide to carry out a polymerization reaction, and obtain a polyether polyol oligomer after the reaction is completed; S3: use the polyether polyol oligomer as a mother liquor, use 0.55g of potassium sodium double metal cyanide complex as a catalyst, add 3.2g of propylene oxide to initiate a reaction, and after initiation, continuously add 16g of dihydroxymethylpropionic acid, 22g of ethylene oxide and 3.2g of propylene oxide to carry out a ring-opening polymerization reaction to obtain the target product chain extender.

[0047] The emulsifier is specifically polyoxyethylene ether.

[0048] A method for manufacturing a vibration-reducing and noise-reducing polyurethane elastic material comprises the following steps:

[0049] Step S1, raw material preparation: weigh and prepare the raw materials according to the raw material components required by the preparation process;

[0050] Step S2, prepolymerization: 50.53 wt% of oligomer polyol and 27.5 wt% of polyisocyanate are added into a reaction kettle at room temperature and pressure, and the reaction kettle is opened and stirred at 60° C. for 4 hours;

[0051] Step S3, catalytic reaction: adding 0.07 wt% of a catalyst to the reactor in step S2 for catalytic reaction, thereby improving the reaction efficiency and obtaining a prepolymer;

[0052] Step S4, dispersion and emulsification: adding 4 wt% of emulsifier to the prepolymer obtained in step S3, and emulsifying the prepolymer with 4 wt% of emulsifier, so that the prepolymer is dispersed in water under the action of shear force;

[0053] Step S5, chain extension reaction: adding 4.4 wt% of a chain extender to the mixture obtained in step S4, wherein 4.4 wt% of the chain extender rapidly promotes the chain growth reaction of the mixture to generate a high molecular weight polyurethane;

[0054] Step S6, foaming and opening cells: adding 6wt% of a foaming agent and 3.5wt% of a cell-opening agent to the high molecular weight polyurethane obtained in step S5, wherein the 6wt% of the foaming agent and the 3.5wt% of the cell-opening agent allow the interior of the high molecular weight polyurethane to open cells quickly, thereby increasing the amount of pores generated in the interior of the high molecular weight polyurethane;

[0055] Step S7, coloring: adding 4 wt% of pigment to the polyurethane obtained in step S6 for coloring, and obtaining the required vibration-damping and noise-reducing polyurethane elastic material.

[0056] When adding 4 wt % of the emulsifier in step S4, the temperature needs to be kept below 50° C., and the emulsifier needs to be added continuously and evenly within 25 minutes.

[0057] After step S7 is completed, cooling water is introduced into the jacket of the reactor, and the cold water is waited to cool the polyurethane material. The temperature of the polyurethane material is measured in real time during the cooling process. After the cooling water cools the obtained polyurethane material to 35° C., nitrogen needs to be introduced into the reactor. After the nitrogen is introduced, the vibration-damping and noise-reducing polyurethane elastic material passes through a filter. The filter can filter the polyurethane material, thereby removing impurities in the polyurethane material. Finally, the polyurethane material is pressed into a packaging product and packaged into a finished vibration-damping and noise-reducing polyurethane elastic material.

[0058] Example 3

[0059] The difference from the above embodiment is that: the present invention provides a vibration-damping and noise-reducing polyurethane elastic material, and the material formula is composed of the following components in mass percentage: 40.92wt% of oligomer polyol, 30.5wt% of polyisocyanate, 4.5wt% of chain extender, 0.08wt% of catalyst, 5wt% of emulsifier, 8wt% of foaming agent, 5wt% of pore opener, and 6wt% of pigment.

[0060] The oligomer polyol is specifically a polyether polyol, and the components of the polyether polyol are: ethylene oxide, propylene oxide, tetrahydrofuran monomer, KOH and amine, and the specific gravity is: 40 parts of ethylene oxide, 30 parts of propylene oxide, 20 parts of tetrahydrofuran monomer, 5 parts of KOH and 5 parts of diethylamine.

[0061] The pore opening agent is specifically polybutadiene and dimethylpolysiloxane, and the mixing weight ratio is 1:2.

[0062] The foaming agent includes a mixture of a carbon dioxide foaming agent, a hydrogenated chlorofluorocarbon foaming agent, a hydrogenated fluoroalkane foaming agent, 2,2'-azobisisobutyronitrile, diisopropyl azodicarboxylate and diethyl azodicarboxylate, and the mixing weight ratio of the carbon dioxide foaming agent, the hydrogenated chlorofluorocarbon foaming agent, the hydrogenated fluoroalkane foaming agent, 2,2'-azobisisobutyronitrile and diethyl azodicarboxylate is 1:1:1:1:1:1:1.

[0063] The catalyst includes a mixture of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine, trimethylbenzylamine, dimethylethanolamine and morpholine, and the mixing weight ratio of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine, trimethylbenzylamine, dimethylethanolamine and morpholine is 1:1:1:1:1:1:1:1.

[0064] The preparation method of the chain extender is as follows: S1: weigh 60g of diethylene glycol, and add 5g of potassium hydroxide to the diethylene glycol; S2: drop 25g of ethylene oxide into a mixture of diethylene glycol and potassium hydroxide to carry out a polymerization reaction, and obtain a polyether polyol oligomer after the reaction is completed; S3: use the polyether polyol oligomer as a mother liquor, use 0.65g of potassium sodium double metal cyanide complex as a catalyst, add 3.5g of propylene oxide to carry out an initiation reaction, and after initiation, continuously add 18g of dihydroxymethylpropionic acid, 25g of ethylene oxide and 3.5g of propylene oxide to carry out a ring-opening polymerization reaction to obtain the target product chain extender.

[0065] The emulsifier is specifically fatty alcohol polyoxyethylene ether.

[0066] A method for manufacturing a vibration-reducing and noise-reducing polyurethane elastic material comprises the following steps:

[0067] Step S1, raw material preparation: weigh and prepare the raw materials according to the raw material components required by the preparation process;

[0068] Step S2, prepolymerization: 40.92 wt% of oligomer polyol and 30.5 wt% of polyisocyanate are added into a reaction kettle at room temperature and pressure, and the reaction kettle is opened and stirred at 70° C. for 5 hours;

[0069] Step S3, catalytic reaction: adding 0.08 wt% of a catalyst to the reactor in step S2 for catalytic reaction, thereby improving the reaction efficiency and obtaining a prepolymer;

[0070] Step S4, dispersion and emulsification: adding 5wt% of emulsifier to the prepolymer obtained in step S3, and emulsifying the prepolymer with 5wt% of emulsifier, so that the prepolymer is dispersed in water under the action of shear force;

[0071] Step S5, chain extension reaction: adding 4.5 wt% of a chain extender to the mixture obtained in step S4, wherein 4.5 wt% of the chain extender rapidly promotes the chain extension reaction of the mixture to generate a high molecular weight polyurethane;

[0072] Step S6, foaming and opening cells: adding 8wt% of a foaming agent and 5wt% of a cell-opening agent to the high molecular weight polyurethane obtained in step S5, wherein the 8wt% of the foaming agent and the 5wt% of the cell-opening agent allow the high molecular weight polyurethane to open cells quickly, thereby increasing the amount of pores generated inside the high molecular weight polyurethane;

[0073] Step S7, coloring: adding 6 wt % of pigment to the polyurethane obtained in step S6 for coloring, and obtaining the required vibration-damping and noise-reducing polyurethane elastic material.

[0074] When adding 5 wt % of the emulsifier in step S4, the temperature needs to be kept below 50° C., and the emulsifier needs to be added continuously and evenly within 30 minutes.

[0075] After step S7 is completed, cooling water is introduced into the jacket of the reactor, and the cold water is waited to cool the polyurethane material. The temperature of the polyurethane material is measured in real time during the cooling process. After the cooling water cools the obtained polyurethane material to 40° C., nitrogen needs to be introduced into the reactor. After the nitrogen is introduced, the vibration-damping and noise-reducing polyurethane elastic material passes through a filter. The filter can filter the polyurethane material, thereby removing impurities in the polyurethane material. Finally, the polyurethane material is pressed into a packaging product and packaged into a finished vibration-damping and noise-reducing polyurethane elastic material.

[0076] Control group

[0077] The difference from the above embodiment is that the material formula consists of the following components in percentage by mass: oligomer polyol 45.92wt%, polyisocyanate 30.5wt%, chain extender 4.5wt%, catalyst 0.08wt%, emulsifier 5wt%, foaming agent 8wt%, pigment 6wt%.

[0078] The oligomer polyol is specifically a polyether polyol, and the components of the polyether polyol are: ethylene oxide, propylene oxide, tetrahydrofuran monomer, KOH and amine, and the specific gravity is: 40 parts of ethylene oxide, 30 parts of propylene oxide, 20 parts of tetrahydrofuran monomer, 5 parts of KOH and 5 parts of diethylamine.

[0079] The foaming agent includes a mixture of a carbon dioxide foaming agent, a hydrogenated chlorofluorocarbon foaming agent, a hydrogenated fluoroalkane foaming agent, 2,2'-azobisisobutyronitrile, diisopropyl azodicarboxylate and diethyl azodicarboxylate, and the mixing weight ratio of the carbon dioxide foaming agent, the hydrogenated chlorofluorocarbon foaming agent, the hydrogenated fluoroalkane foaming agent, 2,2'-azobisisobutyronitrile and diethyl azodicarboxylate is 1:1:1:1:1:1:1.

[0080] The catalyst includes a mixture of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine, trimethylbenzylamine, dimethylethanolamine and morpholine, and the mixing weight ratio of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine, trimethylbenzylamine, dimethylethanolamine and morpholine is 1:1:1:1:1:1:1:1.

[0081] The preparation method of the chain extender is as follows: S1: weigh 60g of diethylene glycol, and add 5g of potassium hydroxide to the diethylene glycol; S2: drop 25g of ethylene oxide into a mixture of diethylene glycol and potassium hydroxide to carry out a polymerization reaction, and obtain a polyether polyol oligomer after the reaction is completed; S3: use the polyether polyol oligomer as a mother liquor, use 0.65g of potassium sodium double metal cyanide complex as a catalyst, add 3.5g of propylene oxide to carry out an initiation reaction, and after initiation, continuously add 18g of dihydroxymethylpropionic acid, 25g of ethylene oxide and 3.5g of propylene oxide to carry out a ring-opening polymerization reaction to obtain the target product chain extender.

[0082] The emulsifier is specifically fatty alcohol polyoxyethylene ether.

[0083] A method for manufacturing a vibration-reducing and noise-reducing polyurethane elastic material comprises the following steps:

[0084] Step S1, raw material preparation: weigh and prepare the raw materials according to the raw material components required by the preparation process;

[0085] Step S2, prepolymerization: 45.92 wt% of oligomer polyol and 30.5 wt% of polyisocyanate are added into a reaction kettle at room temperature and pressure, and the reaction kettle is opened and stirred at 70° C. for 5 hours;

[0086] Step S3, catalytic reaction: adding 0.08 wt% of a catalyst to the reactor in step S2 for catalytic reaction, thereby improving the reaction efficiency and obtaining a prepolymer;

[0087] Step S4, dispersion and emulsification: adding 5wt% of emulsifier to the prepolymer obtained in step S3, and emulsifying the prepolymer with 5wt% of emulsifier, so that the prepolymer is dispersed in water under the action of shear force;

[0088] Step S5, chain extension reaction: adding 4.5 wt% of a chain extender to the mixture obtained in step S4, wherein 4.5 wt% of the chain extender rapidly promotes the chain extension reaction of the mixture to generate a high molecular weight polyurethane;

[0089] Step S6, foaming: adding 8wt% of a foaming agent to the high molecular weight polyurethane obtained in step S5, wherein the 8wt% of the foaming agent allows the interior of the high molecular weight polyurethane to foam rapidly;

[0090] Step S7, coloring: adding 6 wt % of pigment to the polyurethane obtained in step S6 for coloring, and obtaining the required vibration-damping and noise-reducing polyurethane elastic material.

[0091] When adding 5 wt % of the emulsifier in step S4, the temperature needs to be kept below 50° C., and the emulsifier needs to be added continuously and evenly within 30 minutes.

[0092] After step S7 is completed, cooling water is introduced into the jacket of the reaction flask, and the cold water is waited to cool the polyurethane material. During the cooling process, the temperature of the polyurethane material is measured in real time. After the cooling water cools the obtained polyurethane material to 40° C., nitrogen needs to be introduced into the reaction flask. After the nitrogen is introduced, the vibration-damping and noise-reducing polyurethane elastic material passes through a filter screen. The filter screen can filter the polyurethane material, thereby removing impurities in the polyurethane material. Finally, the polyurethane material is pressed into a packaging product and packaged into a finished vibration-damping and noise-reducing polyurethane elastic material.

[0093] The material performance parameters prepared in the above implementation cases are measured by using a material density meter to measure the density of the material, and by using a material tensile testing machine to test the compression stiffness of the material. The polyurethane elastic material is placed on the material tensile testing machine to apply pressure, and the pressure required to be applied for unit internal deformation of the polyurethane material is recorded, thereby calculating the static compression stiffness of the polyurethane material. The polyurethane material is placed on a tensile testing machine with alternating loads turned on for a deformation test to obtain the dynamic compression stiffness. The static compression stiffness is compared with the dynamic compression stiffness to obtain the dynamic-static stiffness ratio. The test results are shown in the following table:

[0094]

[0095] It can be seen from the data in the above table that the density of the polyurethane material prepared by the present invention is significantly lower than that of the existing polyurethane material, and the dynamic-static compression stiffness ratio is 1 to 1.5. The stiffness of the elastomer pad is not much different when static pressure and dynamic pressure act, thereby effectively reducing the vibration and noise of the car during driving.

[0096] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0097] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vibration-reducing and noise-reducing polyurethane elastic material, characterized in that: The material formula consists of the following components in percentage by mass: 40.5-70.5wt% of oligomer polyol, 20.5-30.5wt% of polyisocyanate, 4.2-4.5wt% of chain extender, 0.05-0.08wt% of catalyst, 3.1-5wt% of emulsifier, 4-8wt% of foaming agent, 2.5-5wt% of pore opener and 3-6.42wt% of pigment.

2. The vibration-damping and noise-reducing polyurethane elastic material according to claim 1, characterized in that: The oligomer polyol is specifically a polyether polyol, and the components of the polyether polyol are: ethylene oxide, propylene oxide, tetrahydrofuran monomer, KOH and amine.

3. The vibration-damping and noise-reducing polyurethane elastic material according to claim 1, characterized in that: The preparation method of the chain extender is as follows: S1: weigh 50-60g of diethylene glycol, and add 3-5g of potassium hydroxide to the diethylene glycol; S2: drop 21-25g of ethylene oxide to the mixed solution of diethylene glycol and potassium hydroxide to carry out polymerization reaction, and obtain polyether polyol oligomer after the reaction is completed; S3: use the polyether polyol oligomer as a mother liquor, use 0.5-0.65g of a double metal cyanide complex as a catalyst, add 3-3.5g of propylene oxide to carry out an initiation reaction, and after initiation, continuously add 15-18g of dihydroxymethylpropionic acid, 20-25g of ethylene oxide and 3-3.5g of propylene oxide to carry out a ring-opening polymerization reaction to obtain the target product chain extender.

4. The vibration-damping and noise-reducing polyurethane elastic material according to claim 1, characterized in that: The pore opener includes one or more of an organic pore opener and an inorganic pore opener.

5. The vibration-damping and noise-reducing polyurethane elastic material according to claim 4, characterized in that: The foaming agent includes one or more of a carbon dioxide foaming agent, a hydrogenated chlorofluorocarbon foaming agent, a hydrogenated fluoroalkane foaming agent, 2,2'-azobisisobutyronitrile, diisopropyl azodicarboxylate and diethyl azodicarboxylate.

6. The vibration-damping and noise-reducing polyurethane elastic material according to claim 1, characterized in that: The boiling point of the foaming agent is 16°C to 75°C.

7. The vibration-damping and noise-reducing polyurethane elastic material according to claim 6, characterized in that: The catalyst includes one or more of stannous octoate, dibutyltin dilaurate, triethylenediamine, triethylamine, trimethylbenzylamine, dimethylethanolamine and morpholine.

8. The method for manufacturing the vibration-damping and noise-reducing polyurethane elastic material according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, raw material preparation: weigh and prepare the raw materials according to the raw material components required by the preparation process, and the weighed raw materials include: 40.5-70.5wt% of oligomer polyol, 20.5-30.5wt% of polyisocyanate, 4.2-4.5wt% of chain extender, 0.05-0.08wt% of catalyst, 3.1-5wt% of emulsifier, 4-8wt% of foaming agent, 2.5-5wt% of pore opener, and 3-6.42wt% of pigment; Step S2, prepolymerization: 40.5-70.5 wt% of oligomer polyol and 20.5-30.5 wt% of polyisocyanate are added to a reaction kettle at room temperature and pressure, and the reaction kettle is opened and stirred at 50-80° C. for 3-5 hours; Step S3, catalytic reaction: adding 0.05-0.08 wt% of a catalyst to the reactor in step S2 for catalytic reaction, thereby improving the reaction efficiency and obtaining a prepolymer; Step S4, dispersion and emulsification: adding 3.1-5 wt% of emulsifier to the prepolymer obtained in step S3, and emulsifying the prepolymer by 3.1-5 wt% of emulsifier, so that the prepolymer is dispersed in water under the action of shear force; Step S5, chain extension reaction: adding 4.2-4.5 wt% of chain extender to the mixture obtained in step S4, wherein 4.2-4.5 wt% of chain extender rapidly promotes the chain growth reaction of the mixture to generate high molecular weight polyurethane; Step S6, foaming and opening cells: adding 4-8wt% of a foaming agent and 2.5-5wt% of a cell opening agent to the high molecular weight polyurethane obtained in step S5, wherein the 4-8wt% of the foaming agent and the 2.5-5wt% of the cell opening agent allow the high molecular weight polyurethane to open cells quickly, thereby increasing the number of pores generated inside the high molecular weight polyurethane; Step S7, coloring: adding 3-6.42 wt% of pigment to the polyurethane obtained in step S6 for coloring, so as to obtain the required vibration-damping and noise-reducing polyurethane elastic material.

9. The method for manufacturing the vibration-damping and noise-reducing polyurethane elastic material according to claim 8, characterized in that: When adding 3.1-5 wt % of emulsifier in step S4, the temperature needs to be kept below 50° C., and the 3.1-5 wt % of emulsifier needs to be added continuously and evenly within 20-30 minutes.

10. The method for manufacturing the vibration-damping and noise-reducing polyurethane elastic material according to claim 8, characterized in that: After step S7 is completed, cooling water is introduced into the jacket of the reactor for cooling, and the cold water is waited to cool the polyurethane material. The temperature of the polyurethane material is measured in real time during the cooling process. After the cooling water cools the obtained polyurethane material to 30-40° C., nitrogen needs to be introduced into the reactor. After the nitrogen is introduced, the vibration-damping and noise-reducing polyurethane elastic material passes through a filter screen. The filter screen can filter the polyurethane material, thereby removing impurities in the polyurethane material. Finally, the polyurethane material is pressed into a packaging product and packaged into a finished vibration-damping and noise-reducing polyurethane elastic material.

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