Low-heat-generation wear-resistant polyurethane elastomer for truck tire and preparation method of low-heat-generation wear-resistant polyurethane elastomer

Abstract

The invention provides a polyurethane elastomer material and a preparation method thereof. Comprising 40 to 60 parts by weight of polytetrahydrofuran polyol, 20 to 30 parts by weight of isocyanate, 1 to 10 parts by weight of an organosilicon prepolymer, 1 to 10 parts by weight of a chain extender, 1 to 5 parts by weight of a cross-linking agent, 0.5 to 2 parts by weight of a light stabilizer, 0.5 to 2 parts by weight of an antioxidant, 0.5 to 2 parts by weight of an ultraviolet absorbent and 0.01 to 0.08 part by weight of a catalyst. According to the invention, the variety and molecular weight of polyol molecules and the symmetry of isocyanate are regulated and controlled, chemical bond micro-crosslinking is carried out through small molecules, and-Si-O-bonds are introduced to regulate and control the wear resistance of polyurethane, so that the polyurethane elastomer has multifunctional comprehensive characteristics of low heat generation, high wear resistance and high mechanical properties; on the basis of reducing the production and application cost of the tire material, the service life of the tire can be prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane elastomers, and relates to a polyurethane elastomer and a preparation method and application thereof, and in particular to a low heat generation and wear-resistant polyurethane elastomer for load-bearing tires and a preparation method thereof. Background Art

[0002] Polyurethane elastomers have excellent mechanical properties. They can increase hardness while maintaining rubber elasticity, thereby achieving high load-bearing capacity. They are widely used in non-pneumatic load-bearing tires. They mainly reduce the dynamic heat generation problem of load-bearing tires during the load-bearing process, while improving the wear resistance of tires and reducing rolling resistance. Cast polyurethane elastomers are block polymers composed of soft and hard segments. The molecules contain polar groups such as ester groups, carbamate groups, and urea groups. These polar groups promote the formation of a large number of hydrogen bonds within and between molecules, thereby increasing the intermolecular forces. In addition, the chemical cross-linking and steric hindrance effects between molecules seriously hinder the internal rotation of single bonds. Therefore, under the action of alternating external forces of a certain frequency and amplitude, the strain of polyurethane materials cannot synchronize with the changes in stress and hysteresis occurs, resulting in dynamic mechanical losses, which causes large internal heat generation, seriously affecting the performance of the material and restricting its use under high dynamic conditions such as automobile tires and high-speed rubber rollers.

[0003] Although there are some research schemes for dynamic heat generation performance in the prior art, such as CN117843911A disclosed in the prior art uses polycaprolactone diol 2000 with a water content of less than 0.03%; polycaprolactone diol 2000 and 1,5-naphthalene diisocyanate react at 85°C for 1 hour, then add antioxidant 1076, add a mixed solution of chain extender and crosslinker mixed by 1,4-butanediol, chain extender and trimethylolpropane in the above mass ratio, add a catalyst after sufficient stirring, and the mixture is stirred, poured, and cured to obtain a cast polyurethane elastomer. The loss factor of the obtained polyurethane elastomer is above 0.04 at 60°C. However, in the above patent, only the dynamic heat generation problem of the material is solved, and the wear resistance of the material is not mentioned. Moreover, most of the high-load-bearing polyurethane elastomers prepared by the prior art cannot take into account the low heat generation and wear resistance of the material. However, in actual applications, the operating environment of load-bearing tires is usually harsh. The heat generation and wear resistance of polyurethane elastomers can seriously affect the service life of the tires, and also increase the maintenance and repair costs of the vehicles.

[0004] Therefore, how to develop a more suitable low-heat-generating polyurethane elastomer material with wear resistance is urgent and is also one of the focuses of attention of many forward-looking researchers in the industry. Summary of the invention

[0005] In view of this, the technical problem solved by the present invention is to provide a polyurethane elastomer and a preparation method and application thereof, in particular, a low heat generation and wear-resistant polyurethane elastomer for load-bearing tires and a preparation method thereof. The polyurethane elastomer provided by the present invention has a lower loss factor at 40°C, lower rolling resistance and dynamic heat generation, and can extend the service life of tires on the basis of reducing the production and application costs of tire materials. Moreover, the preparation method is simple, the conditions are mild, and the controllability is good, which is more suitable for industrial application and promotion.

[0006] The present invention provides a polyurethane elastomer material, which comprises, by weight of raw materials:

[0007]

[0008] Preferably, the weight average molecular weight of the polytetrahydrofuran polyol is 650 to 3000;

[0009] The isocyanate includes one or more of dimethyl diphenyl diisocyanate, naphthalene-1,5 diisocyanate, p-phenylene diisocyanate and hexamethylene diisocyanate trimer;

[0010] The organosilicon prepolymer includes a hydroxyl-terminated organosilicon prepolymer and / or an amino-terminated organosilicon prepolymer.

[0011] Preferably, the chain extender comprises 1,4-butanediol and / or 1,6-hexanediol;

[0012] The cross-linking agent includes glycerol and / or trimethylolpropane;

[0013] The light stabilizer includes triphenyl phosphite;

[0014] The polyurethane elastomer is specifically a low heat build-up and wear-resistant polyurethane elastomer.

[0015] Preferably, the antioxidant comprises antioxidant 1135 and / or antioxidant 264;

[0016] The ultraviolet absorber includes ultraviolet absorber UV-531;

[0017] The catalyst includes dibutyltin dilaurate and / or stannous zincate;

[0018] The polyurethane elastomer includes a polyurethane elastomer for a load-carrying tire.

[0019] The present invention also provides a method for preparing the polyurethane elastomer material as described in any one of the above technical solutions, comprising the following steps:

[0020] 1) mixing polytetrahydrofuran polyol and isocyanate and heating up, reacting under a protective atmosphere to obtain a prepolymer;

[0021] 2) adding the organosilicon prepolymer to the prepolymer obtained in the above step, heating the mixture and reacting the mixture again to obtain a mixed prepolymer;

[0022] 3) The mixed prepolymer, chain extender, crosslinker, light stabilizer, antioxidant, ultraviolet absorber and catalyst obtained in the above steps are placed in a mold for pressure vulcanization molding, and then ripened to obtain a polyurethane elastomer material.

[0023] Preferably, the polytetrahydrofuran polyol is specifically pretreated polytetrahydrofuran polyol;

[0024] The pretreatment step specifically comprises heating the polytetrahydrofuran polyol and then performing vacuum dehydration;

[0025] The heating temperature is 110-120°C;

[0026] The vacuum dehydration time is 2 to 3 hours.

[0027] Preferably, the mixing time is 1 to 2 hours;

[0028] In the step 1), the temperature of the heating is 75-85°C;

[0029] The reaction time is 2 to 3 hours;

[0030] The mass fraction of isocyanate groups in the prepolymer is 15% to 30%.

[0031] Preferably, in step 2), the heating temperature is 70-90° C.;

[0032] The time for the second reaction is 1 to 3 hours;

[0033] The method of carrying out the reaction again is to remove water in vacuum to carry out the reaction;

[0034] The mass fraction of isocyanate groups in the mixed prepolymer is 8% to 13%.

[0035] Preferably, the temperature of the pressurized vulcanization molding is 100-120°C;

[0036] The time of the pressurized vulcanization molding is 1 to 2 hours;

[0037] The aging temperature is 100-120°C;

[0038] The aging time is 24 to 48 hours.

[0039] The present invention also provides the use of the polyurethane elastomer material described in any one of the above technical solutions or the polyurethane elastomer material prepared by the preparation method described in any one of the above technical solutions in tires.

[0040] The present invention provides a polyurethane elastomer material, which comprises, by weight of raw materials, 40 to 60 parts by weight of polytetrahydrofuran polyol, 20 to 30 parts by weight of isocyanate, 1 to 10 parts by weight of organosilicon prepolymer, 1 to 10 parts by weight of chain extender, 1 to 5 parts by weight of crosslinker, 0.5 to 2 parts by weight of light stabilizer, 0.5 to 2 parts by weight of antioxidant, 0.5 to 2 parts by weight of ultraviolet absorber and 0.01 to 0.08 parts by weight of catalyst. Compared with the prior art, the present invention believes that a large number of polar groups (ester groups) exist in the polyester polyol molecular chain, which increases the intermolecular force, forms hydrogen bonds between part of the soft segment phase and the hard segment, increases the compatibility of the polyester soft segment and the hard segment, and the hard segment phase is more evenly distributed in the soft segment phase, thereby reducing the microphase separation degree relative to the polyether polyurethane elastomer, so the polyester polyurethane material generates more heat under dynamic conditions, and the dynamic performance is worse than that of the polyether material. At the same time, the better the rigidity, symmetry and regularity of the hard segment phase, the better the heat resistance of the elastomer. At the same time, the wear resistance directly affects the service life of the tire during use. By introducing amino-terminated linear polysiloxane into the preparation raw materials, the -Si-O- bond is successfully introduced into the molecular chain of TPU, so that the obtained silicone-modified polyurethane elastomer has excellent wear resistance.

[0041] Based on this, the present invention specially designs a polyurethane elastomer material with specific components and structures, which is a high-strength, low-heat-generating, wear-resistant polyurethane elastomer that can meet the increasingly stringent engineering application requirements. The present invention introduces trifunctional isocyanates or crosslinking agents to increase the crosslinking degree of the system, improve the mechanical properties of the polyurethane elastomer, and make it have better wear resistance and environmental aging resistance, and can have a longer service life of the polyurethane; by introducing amino-terminated linear polysiloxane into the preparation of raw materials, the -Si-O- bond is successfully introduced into the molecular chain of TPU, so that the obtained silicone-modified polyurethane elastomer has excellent wear resistance; by selecting symmetrical isocyanate structures and polyol molecular types and molecular weights, the damping factor of the polyurethane elastomer material above 40°C is within 0.04.

[0042] The polyurethane elastomer provided by the present invention achieves the multifunctional comprehensive characteristics of low heat generation, high wear resistance and high mechanical properties by regulating the type and molecular weight of polyol molecules and the symmetry of isocyanate, and regulating the wear resistance of polyurethane by chemical bond micro-crosslinking of small molecules and the introduction of -Si-O- bonds. The polyurethane elastomer has a lower loss factor at 40°C, lower rolling resistance and dynamic heat generation, and can extend the service life of tires on the basis of reducing the production and application costs of tire materials. In addition, the preparation method is simple, the conditions are mild, and the controllability is good, which is more suitable for industrial application and promotion. DETAILED DESCRIPTION

[0043] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0044] All raw materials of the present invention have no particular limitation on their sources, and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0045] There is no particular restriction on the purity of all raw materials in the present invention. The present invention preferably uses industrial pure materials or materials of conventional purity used in the field of preparing polyurethane elastomer materials for tires.

[0046] All noun expressions, abbreviations and trademarks in the present invention are conventional noun expressions, abbreviations and trademarks in the field. Each noun expression, abbreviation and trademark is clear and unambiguous in its relevant application field, and those skilled in the art can clearly, accurately and uniquely understand it based on the noun expressions, abbreviations and trademarks.

[0047] The present invention provides a polyurethane elastomer material, which comprises, by weight of raw materials:

[0048]

[0049] In the present invention, the added amount of the polytetrahydrofuran polyol is 40 to 60 parts by weight, can be 44 to 56 parts by weight, can be 48 to 52 parts by weight.

[0050] In the present invention, the amount of the isocyanate added is 20 to 30 parts by weight, can be 22 to 28 parts by weight, can be 24 to 26 parts by weight.

[0051] In the present invention, the amount of the organosilicon prepolymer added is 1 to 10 parts by weight, can be 3 to 8 parts by weight, or can be 5 to 6 parts by weight.

[0052] In the present invention, the added amount of the chain extender is 1 to 10 parts by weight, can be 3 to 8 parts by weight, can be 5 to 6 parts by weight.

[0053] In the present invention, the amount of the cross-linking agent added is 1 to 10 parts by weight, can be 1.5 to 4.5 parts by weight, can be 2 to 4 parts by weight, can be 2.5 to 3.5 parts by weight.

[0054] In the present invention, the light stabilizer is added in an amount of 0.5 to 2 parts by weight, may be 0.8 to 1.7 parts by weight, or may be 1.1 to 1.4 parts by weight.

[0055] In the present invention, the antioxidant is added in an amount of 0.5 to 2 parts by weight, may be 0.8 to 1.7 parts by weight, or may be 1.1 to 1.4 parts by weight.

[0056] In the present invention, the added amount of the ultraviolet absorber is 0.5 to 2 parts by weight, can be 0.8 to 1.7 parts by weight, can be 1.1 to 1.4 parts by weight.

[0057] In the present invention, the added amount of the catalyst is 0.01 to 0.08 parts by weight, can be 0.02 to 0.07 parts by weight, can be 0.03 to 0.06 parts by weight, can be 0.04 to 0.05 parts by weight.

[0058] In the present invention, the weight average molecular weight of the polytetrahydrofuran polyol is preferably 650 to 3000, more preferably 1150 to 2500, and more preferably 1650 to 2000. Specifically, the polytetrahydrofuran polyol may be a polytetrahydrofuran polyol having a functionality of 2.

[0059] In the present invention, the isocyanate preferably includes one or more of dimethyl diphenyl diisocyanate, naphthalene-1,5 diisocyanate, p-phenylene diisocyanate and hexamethylene diisocyanate trimer, more preferably dimethyl diphenyl diisocyanate, naphthalene-1,5 diisocyanate, p-phenylene diisocyanate or hexamethylene diisocyanate trimer.

[0060] In the present invention, the organosilicon prepolymer preferably includes a hydroxyl-terminated organosilicon prepolymer and / or an amino-terminated organosilicon prepolymer, and more preferably a hydroxyl-terminated organosilicon prepolymer or an amino-terminated organosilicon prepolymer. The specific grades may be: or

[0062] In the present invention, the chain extender preferably includes 1,4-butanediol and / or 1,6-hexanediol, and more preferably 1,4-butanediol or 1,6-hexanediol.

[0063] In the present invention, the cross-linking agent preferably includes glycerol and / or trimethylolpropane, more preferably glycerol or trimethylolpropane.

[0064] In the present invention, the light stabilizer preferably includes triphenyl phosphite.

[0065] In the present invention, the polyurethane elastomer is preferably a low heat build-up and wear-resistant polyurethane elastomer.

[0066] In the present invention, the antioxidant preferably includes antioxidant 1135 and / or antioxidant 264, and more preferably antioxidant 1135 or antioxidant 264.

[0067] In the present invention, the ultraviolet absorber preferably includes ultraviolet absorber UV-531.

[0068] In the present invention, the catalyst preferably includes dibutyltin dilaurate and / or stannous zincate, more preferably dibutyltin dilaurate or stannous zincate.

[0069] In the present invention, the polyurethane elastomer preferably includes a polyurethane elastomer for a load-carrying tire.

[0070] The present invention provides a method for preparing a polyurethane elastomer material as described in any one of the above technical solutions, comprising the following steps:

[0071] 1) mixing polytetrahydrofuran polyol and isocyanate and heating up, reacting under a protective atmosphere to obtain a prepolymer;

[0072] 2) adding the organosilicon prepolymer to the prepolymer obtained in the above step, heating the mixture and reacting the mixture again to obtain a mixed prepolymer;

[0073] 3) The mixed prepolymer, chain extender, crosslinker, light stabilizer, antioxidant, ultraviolet absorber and catalyst obtained in the above steps are placed in a mold for pressure vulcanization molding, and then ripened to obtain a polyurethane elastomer material.

[0074] The invention firstly mixes polytetrahydrofuran polyol and isocyanate, then heats the mixture and reacts them under a protective atmosphere to obtain a prepolymer.

[0075] In the present invention, the polytetrahydrofuran polyol is preferably pretreated polytetrahydrofuran polyol.

[0076] In the present invention, the pretreatment step is preferably to heat the polytetrahydrofuran polyol and then perform vacuum dehydration.

[0077] In the present invention, the heating temperature is preferably 110-120°C, more preferably 112-118°C, and more preferably 114-116°C.

[0078] In the present invention, the vacuum dehydration time is preferably 2 to 3 hours, more preferably 2.2 to 2.8 hours, and more preferably 2.4 to 2.6 hours.

[0079] In the present invention, the mixing time is preferably 1 to 2 hours, more preferably 1.2 to 1.8 hours, and more preferably 1.4 to 1.6 hours.

[0080] In the present invention, in the step 1), the heating temperature is preferably 75 to 85°C, more preferably 77 to 83°C, and more preferably 79 to 81°C.

[0081] In the present invention, the reaction time is preferably 2 to 3 hours, more preferably 2.2 to 2.8 hours, and more preferably 2.4 to 2.6 hours.

[0082] In the present invention, the mass fraction of the isocyanate groups in the prepolymer is preferably 15% to 30%, more preferably 18% to 27%, and more preferably 21% to 24%.

[0083] In the present invention, the organic silicon prepolymer is added into the prepolymer obtained in the above step, and the mixture is reacted again after the temperature is raised to obtain a mixed prepolymer.

[0084] In the present invention, in the step 2), the heating temperature is preferably 70-90°C, more preferably 74-86°C, and more preferably 78-82°C.

[0085] In the present invention, the time for the second reaction is preferably 1 to 3 hours, more preferably 1.4 to 2.6 hours, and more preferably 1.8 to 2.2 hours.

[0086] In the present invention, the method of performing the reaction again is preferably to perform the reaction by removing water in vacuum.

[0087] In the present invention, the mass fraction of the isocyanate groups in the mixed prepolymer is preferably 8% to 13%, more preferably 9% to 12%, and more preferably 10% to 11%.

[0088] Finally, the present invention places the mixed prepolymer, chain extender, crosslinker, light stabilizer, antioxidant, ultraviolet absorber and catalyst obtained in the above steps in a mold for pressure vulcanization molding, and then matures to obtain a polyurethane elastomer material.

[0089] In the present invention, the temperature of the press vulcanization molding is preferably 100 to 120°C, more preferably 104 to 116°C, and even more preferably 108 to 112°C.

[0090] In the present invention, the time for the pressurized vulcanization molding is preferably 1 to 2 hours, more preferably 1.2 to 1.8 hours, and more preferably 1.4 to 1.6 hours.

[0091] In the present invention, the aging temperature is preferably 100-120°C, more preferably 104-116°C, and even more preferably 108-112°C.

[0092] In the present invention, the aging time is preferably 24 to 48 hours, more preferably 24 to 38 hours, more preferably 24 to 28 hours, and specifically can be 24 hours.

[0093] The present invention provides the application of the polyurethane elastomer material described in any one of the above technical solutions or the polyurethane elastomer material prepared by the preparation method described in any one of the above technical solutions in tires.

[0094] The present invention is to complete and refine the overall technical solution, better ensure the composition and structure of the polyurethane elastomer material, and further improve the low heat generation performance, wear resistance and mechanical properties of the polyurethane elastomer material. The above-mentioned low heat generation and wear-resistant polyurethane elastomer for load-bearing tires and its preparation method and application may specifically include the following contents:

[0095] A low heat generation and wear-resistant polyurethane elastomer for load-carrying tires and a preparation method thereof:

[0096] 40-60 parts by weight of polytetrahydrofuran polyol, 20-30 parts by weight of isocyanate, 1-10 parts by weight of silicone prepolymer, 1-10 parts by weight of chain extender, 1-5 parts by weight of crosslinking agent, 0.5-2 parts by weight of light stabilizer, 0.5-2 parts by weight of antioxidant, 0.5-2 parts by weight of ultraviolet absorber, 0.01-0.08 parts by weight of catalyst,

[0097] Pour the measured polyol into a three-necked flask, heat it to 110-120°C, remove water under vacuum for 2-3 hours at a negative pressure of 0.1MPa, then cool it to 60°C, add the measured isocyanate, stir rapidly for 1-2 hours, heat it to 75-85°C, and mechanically stir it for 2-3 hours under a protective gas atmosphere, and measure the mass fraction of isocyanate groups (NCO%) in the reaction to reach the designed value; Pour a certain amount of organosilicon prepolymer into the three-necked flask, heat it To 70-90℃, stir, vacuum dehydration for 1-3h, add a certain amount of additives, and then add the pre-melted chain extender and cross-linking agent to the mixed prepolymer in a certain proportion, stir quickly and degas with an electric stirrer, then pour it into the preheated mold, put it into the heated flat vulcanizer for pressure vulcanization for 1-2h, after demolding, put the sample into a 100℃-120℃ oven and mature it for 24h, take out the sample, and place it at room temperature for one week before conducting performance test.

[0098] Specifically, the molecular weight range of polytetrahydrofuran diol is 650-3000.

[0099] Specifically, one or a combination of dimethyl diphenyl diisocyanate (TODI), naphthalene-1,5 diisocyanate (NDI), p-phenylene diisocyanate (PPDI), and hexamethylene diisocyanate trimer.

[0100] Specifically, the chain extenders are 1,4-butanediol (BDO) and 1,6-hexanediol (HDO).

[0101] Specifically, the cross-linking agents are glycerol and trimethylolpropane (TMP for short).

[0102] Specifically, hydroxyl-terminated silicone prepolymer or amino-terminated silicone prepolymer.

[0103] Specifically, the light stabilizer is triphenyl phosphite.

[0104] Specifically, the antioxidant is 1135.

[0105] Specifically, the ultraviolet absorber is 531.

[0106] Specifically, the catalyst is one or a combination of dibutyltin dilaurate and stannous zincate.

[0107] The above content of the present invention provides a low heat generation and wear-resistant polyurethane elastomer for load-bearing tires, and a preparation method and application thereof. The polyurethane elastomer material designed by the present invention has a specific component and structure, which is a high-strength, low heat generation, wear-resistant polyurethane elastomer that can meet the increasingly stringent engineering application requirements. The present invention introduces a trifunctional isocyanate or a cross-linking agent to increase the cross-linking degree of the system, improve the mechanical properties of the polyurethane elastomer, and make it have better wear resistance and environmental aging resistance, and can have a longer service life of the polyurethane; by introducing amino-terminated linear polysiloxane into the preparation raw materials, the -Si-O- bond is successfully introduced into the molecular chain of TPU, so that the obtained silicone-modified polyurethane elastomer has excellent wear resistance; by selecting a symmetrical isocyanate structure and a polyol molecule type and molecular weight, the damping factor of the polyurethane elastomer material is within 0.04 above 40°C.

[0108] The polyurethane elastomer provided by the present invention achieves the multifunctional comprehensive characteristics of low heat generation, high wear resistance and high mechanical properties by regulating the type and molecular weight of polyol molecules and the symmetry of isocyanate, and regulating the wear resistance of polyurethane by chemical bond micro-crosslinking of small molecules and the introduction of -Si-O- bonds. The polyurethane elastomer has a lower loss factor at 40°C, lower rolling resistance and dynamic heat generation, and can extend the service life of tires on the basis of reducing the production and application costs of tire materials. In addition, the preparation method is simple, the conditions are mild, and the controllability is good, which is more suitable for industrial application and promotion.

[0109] In order to further illustrate the present invention, a polyurethane elastomer provided by the present invention and its preparation method and application are described in detail below in combination with embodiments. However, it should be understood that these embodiments are implemented on the premise of the technical scheme of the present invention, and detailed implementation methods and specific operating processes are given only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention. The protection scope of the present invention is not limited to the following embodiments.

[0110] Example 1

[0111] A low heat generation and wear-resistant polyurethane elastomer for load-carrying tires and a preparation method thereof, the specific preparation method is as follows:

[0112] 56 parts by weight of polytetrahydrofuran diol (molecular weight 1000) were added to the reactor, stirred rapidly, dehydrated at 120°C for 2 hours under nitrogen protection, cooled to 60°C, 29.6 parts of p-phenylene diisocyanate (PPDI) were added, heated to 75°C for 2 hours under nitrogen protection to obtain a prepolymer, and its NCO% content was measured to be 12.66%. 4.5 parts by weight of hydroxyl-terminated silicone prepolymer was added, heated to 90°C for 2 hours, and then taken out for use. 6.5 parts by weight of 1,4-butanediol (BDO), 1.7 parts by weight of propylene glycol, 0.5 parts of triphenyl phosphite light stabilizer, 0.5 parts of 264 antioxidant, 0.5 parts of 531 ultraviolet absorber, and 0.02 parts of dibutyltin dilaurate were mixed and evenly stirred, poured into a mold and vulcanized and cured at 100°C for 1 hour. After demolding, the sample was placed in an oven at 100°C and ripened for 24 hours. The sample was taken out to obtain a polyurethane composite material, and the performance was tested after being placed at room temperature for 7 days.

[0113] Example 2

[0114] A low heat generation and wear-resistant polyurethane elastomer for load-carrying tires and a preparation method thereof, the specific preparation method is as follows:

[0115] 54 parts by weight of polytetrahydrofuran diol (molecular weight 1000) were added to the reactor, stirred rapidly, dehydrated at 120°C for 2h under nitrogen protection, cooled to 60°C, 24.6 parts of p-phenylene diisocyanate (PPDI) and 6 parts of hexamethylene diisocyanate trimer were added, heated to 75°C for 2h under nitrogen protection to obtain a prepolymer, and its NCO% content was measured to be 11.6%. 4.5 parts by weight of hydroxyl-terminated silicone prepolymer was added, heated to 90°C for 2h, and then taken out for use. 7.68 parts by weight of 1,4-butanediol (BDO), 1.7 parts of trimethylolpropane (TMP), 0.5 parts of triphenyl phosphite light stabilizer, 0.5 parts of 264 antioxidant, 0.5 parts of 531 ultraviolet absorber, and 0.02 parts of dibutyltin dilaurate were mixed and evenly stirred, poured into a mold and vulcanized and cured at 100°C for 1 hour. After demolding, the sample was placed in an oven at 100°C and ripened for 24 hours. The sample was taken out to obtain a polyurethane composite material, which was placed at room temperature for 7 days before performance testing.

[0116] Example 3

[0117] A low heat generation and wear-resistant polyurethane elastomer for load-carrying tires and a preparation method thereof, the specific preparation method is as follows:

[0118] 54 parts by weight of polytetrahydrofuran diol (molecular weight 1000) were added to the reactor, stirred rapidly, dehydrated at 120°C for 2h under nitrogen protection, cooled to 60°C, 24.6 parts of p-phenylene diisocyanate (PPDI) and 6 parts of hexamethylene diisocyanate trimer were added, heated to 75°C for 2h under nitrogen protection to obtain a prepolymer, and its NCO% content was measured to be 11.6%. 4.5 parts by weight of hydroxyl-terminated silicone prepolymer was added, heated to 90°C for 2h, and then taken out for use. 7.84 parts by weight of 1,4-butanediol (BDO), 1.54 parts by weight of propylene glycol, 0.5 parts of triphenyl phosphite light stabilizer, 0.5 parts of 264 antioxidant, 0.5 parts of 531 ultraviolet absorber, and 0.02 parts of dibutyltin dilaurate were mixed and evenly stirred, poured into a mold and vulcanized and cured at 100°C for 1 hour. After demolding, the sample was placed in a 100°C oven and ripened for 24 hours. The sample was taken out to obtain a polyurethane composite material, and the performance was tested after being placed at room temperature for 7 days.

[0119] Comparative Example 1

[0120] This comparative example provides a method for preparing a low-heat-generating and wear-resistant polyurethane elastomer. The difference between this method and Example 1 is that silicon prepolymer and cross-linking agent are not added in this comparative example.

[0121] 58 parts by weight of polytetrahydrofuran diol (molecular weight 1000) were added to the reactor, stirred rapidly, dehydrated at 120°C for 2h under nitrogen protection, cooled to 60°C, 31.2 parts of p-phenylene diisocyanate (PPDI) were added, heated to 75°C for 2h under nitrogen protection to obtain prepolymer, heated to 90°C for 2h, and taken out for use. 9.28 parts by weight of 1,4-butanediol (BDO), 0.5 parts of triphenyl phosphite light stabilizer, 0.5 parts of 264 antioxidant, 0.5 parts of 531 ultraviolet absorber, and 0.02 parts of dibutyltin dilaurate were added, stirred evenly, poured into the mold, vulcanized and cured at 100°C for 1h, and the sample was placed in a 100°C oven for aging for 24h after demolding, and the sample was taken out to obtain a polyurethane composite material, which was placed at room temperature for 7 days before performance testing.

[0122] The test results are shown in Table 1:

[0123] Table 1

[0124] Test subjects Damping factor above 40℃ Tensile Strength Modulus Elongation at break Friction coefficient Example 1 <0.04 34.6 MPa 152MPa 450％ 0.71 Example 2 <0.051 41MPa 189MPa 380％ 0.67 Example 3 <0.056 41.2MPa 168MPa 410％ 0.61 Comparative Example 1 <0.04 18.9MPa 114MPa 480％ 0.78

[0125] Compared with Example 1, the polyurethane prepared in Comparative Example 1 has lower heat generation, but lower modulus and lower wear resistance.

[0126] The above is a detailed introduction to a low heat generation and wear-resistant polyurethane elastomer for a load-bearing tire provided by the present invention, and its preparation method and application. The principle and implementation method of the present invention are described in detail using specific examples. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present invention, including the best mode, and also enables any technician in the field to practice the present invention, including the manufacture and use of any device or system, and the implementation of any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements that are not different from the text of the claims, or if they include equivalent structural elements that are not substantially different from the text of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. A polyurethane elastomer material, characterized in that: Calculated by weight of raw materials, including:

2. The polyurethane elastomer material according to claim 1, characterized in that: The weight average molecular weight of the polytetrahydrofuran polyol is 650 to 3000; The isocyanate includes one or more of dimethyl diphenyl diisocyanate, naphthalene-1,5 diisocyanate, p-phenylene diisocyanate and hexamethylene diisocyanate trimer; The organosilicon prepolymer includes a hydroxyl-terminated organosilicon prepolymer and / or an amino-terminated organosilicon prepolymer.

3. The polyurethane elastomer material according to claim 1, characterized in that: The chain extender includes 1,4-butanediol and / or 1,6-hexanediol; The cross-linking agent includes glycerol and / or trimethylolpropane; The light stabilizer includes triphenyl phosphite; The polyurethane elastomer is specifically a low heat build-up and wear-resistant polyurethane elastomer.

4. The polyurethane elastomer material according to claim 1, characterized in that: The antioxidant includes antioxidant 1135 and / or antioxidant 264; The ultraviolet absorber includes ultraviolet absorber UV-531; The catalyst includes dibutyltin dilaurate and / or stannous zincate; The polyurethane elastomer includes a polyurethane elastomer for a load-carrying tire.

5. A method for preparing a polyurethane elastomer material according to any one of claims 1 to 4, characterized in that: The following steps are involved: 1) mixing polytetrahydrofuran polyol and isocyanate and heating up, reacting under a protective atmosphere to obtain a prepolymer; 2) adding the organosilicon prepolymer to the prepolymer obtained in the above step, heating the mixture and reacting the mixture again to obtain a mixed prepolymer; 3) The mixed prepolymer, chain extender, crosslinker, light stabilizer, antioxidant, ultraviolet absorber and catalyst obtained in the above steps are placed in a mold for pressure vulcanization molding, and then ripened to obtain a polyurethane elastomer material.

6. The preparation method according to claim 5, characterized in that: The polytetrahydrofuran polyol is specifically pretreated polytetrahydrofuran polyol; The pretreatment step specifically comprises heating the polytetrahydrofuran polyol and then performing vacuum dehydration; The heating temperature is 110-120°C; The vacuum dehydration time is 2 to 3 hours.

7. The preparation method according to claim 5, characterized in that: The mixing time is 1 to 2 hours; In the step 1), the temperature of the heating is 75-85°C; The reaction time is 2 to 3 hours; The mass fraction of isocyanate groups in the prepolymer is 15% to 30%.

8. The preparation method according to claim 5, characterized in that: In the step 2), the heating temperature is 70-90°C; The time for the second reaction is 1 to 3 hours; The method of carrying out the reaction again is to remove water in vacuum to carry out the reaction; The mass fraction of isocyanate groups in the mixed prepolymer is 8% to 13%.

9. The preparation method according to claim 5, characterized in that: The temperature of the pressurized vulcanization molding is 100-120°C; The time of the pressurized vulcanization molding is 1 to 2 hours; The aging temperature is 100-120°C; The aging time is 24 to 48 hours.

10. Use of the polyurethane elastomer material according to any one of claims 1 to 4 or the polyurethane elastomer material prepared by the preparation method according to any one of claims 5 to 9 in tires.

Images