High-performance pouring type elastomer and preparation method thereof
By using epoxides and carbon dioxide as polymerization monomers, polyether polyols have solved the problem of high cost of cast polyurethane elastomers, improved their tensile and tear strength, reduced carbon emissions, and increased production efficiency.
Patent Information
- Application Number
- CN202511937089.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-03-06
AI Technical Summary
The use of epoxides in the preparation of polyether polyols in existing technologies increases the cost of cast polyurethane elastomers while offering limited performance improvements.
Small molecule polyols with functionality of 2-4 are prepared by using epoxides and carbon dioxide as polymerization monomers and a catalyst. Polyether polyols A and B are then prepared and reacted with isocyanates to form polyether polyols with a carbonate-ether coexistence structure, which are used to prepare cast-type polyurethane elastomers.
It significantly improves the tensile and tear strength of cast polyurethane elastomers, reduces the use of petroleum-based raw materials, lowers carbon emissions, and improves production efficiency.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of polymer technology, and more specifically, to a high-performance castable elastomer and its preparation method. Background Technology
[0002] Carbon dioxide is a greenhouse gas, but also a renewable carbon-oxygen resource. Using carbon dioxide as a monomer in the synthesis of polymers can reduce the polymer industry's dependence on petroleum resources, thus contributing to the diversification of raw material sources and sustainable development in the polymer industry. In recent years, polypropylene carbonate polyols have received widespread attention in the field of carbon dioxide-based polymer synthesis. Polypropylene carbonate polyols are a class of oligomeric polyols containing carbonate and ether structures, possessing structural characteristics such as low molecular weight, terminal hydroxyl groups, and coexistence of carbonate and ether. They can replace polyether or polyester polyols in the synthesis of carbon dioxide-based polyurethanes and are expected to become the next-generation basic raw material for the polyurethane industry. Therefore, developing downstream application products prepared from polyether polyols using carbon dioxide as a monomer is particularly important.
[0003] Cast polyurethane elastomers refer to products where the material system is liquid before molding, allowing for casting and direct curing to form the final product. This chemical processing method has been widely used in industries such as automotive, mining, construction, and printing. Epoxides are the main raw material for preparing polyether polyols, and low-molecular-weight polyether polyols prepared from epoxides are one of the main raw materials for preparing cast polyurethane elastomers. However, due to issues such as carbon emissions, the downstream products of petroleum-based epoxides are somewhat limited. Therefore, how to utilize carbon dioxide polyethers to consume carbon emissions while simultaneously improving the performance of cast polyurethane elastomers is one of the urgent technical problems to be solved. Summary of the Invention
[0004] Therefore, the technical problem to be solved by the present invention is to overcome the increased cost of cast polyurethane elastomer products caused by the use of epoxides to prepare polyether polyols in the prior art, thereby providing a cast polyurethane elastomer whose raw materials include polyether polyols that help improve tensile and tear properties, and a method for preparing the same.
[0005] A castable polyurethane elastomer comprises the following raw materials in parts by weight:
[0006] Polyether polyol A: 0-100 parts; Polyether polyol B: 0-100 parts; Isocyanate: 20-50 parts; p-dichloroaniline methane: 10-15 parts;
[0007] The polyether polyol A is obtained by reacting a small molecule polyol with a functionality of 2-4 as a starting agent, using epoxide and carbon dioxide as polymerization monomers, under the action of a catalyst. Its molecular weight is 1000-10000, and its structural formula is as follows:
[0008]
[0009] A class of polyether polyols with an x / y ratio of 2:1 to 1:20;
[0010] The polyether polyol B is a CASE polyether polyol; specifically, the CASE polyether polyol has the following characteristics: functionality of 2-4, molecular weight of 1000-10000, hydroxyl value of 10-112 mgKOH / g, and viscosity of 100-9000 mPa·s / 25℃.
[0011] Preferably, the isocyanate is one or more of toluene diisocyanate, diphenylmethane diisocyanate, modified diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and modified polymethylene polyphenyl polyisocyanate.
[0012] Preferably, the amine chain extender is an aromatic diamine;
[0013] The aromatic diamine is one or more of 3,3'-dichloro-4,4'-diphenylmethane diamine, 3,5'-dimethylthiotoluene diamine, 3,5'-diethyltoluene diamine, 4,4'-methylenebis(3'-chloro-2,6'-diethylaniline), and 4,4'-methylenebis(2,6'-diethyl').
[0014] More preferably, the amine chain extender is 3,3'-dichloro-4,4'-diphenylmethanediamine and / or 3,5'-dimethylthiotoluenediamine.
[0015] Preferably, the small molecule polyol with a functionality of 2-4 is selected from at least one of ethylene glycol, propylene glycol, butanediol, diethylene glycol, neopentyl glycol, dipropylene glycol, methylpropanediol, glycerol, trimethylolpropane, and pentaerythritol.
[0016] Preferably, the epoxide is at least one of propylene oxide, ethylene oxide, and butane oxide.
[0017] Preferably, the initiator is one or two of propylene glycol, ethylene glycol, and diethylene glycol.
[0018] Preferably, the catalyst is a bimetallic catalyst (DMC).
[0019] Preferably, polyether polyol A is prepared by reacting ethylene glycol or propylene glycol as an initiator, propylene oxide and carbon dioxide as polymerization monomers, and DMC as a catalyst in parts by weight.
[0020] A method for preparing a cast-type polyurethane elastomer includes the following steps: using polyether polyol A, which helps improve tensile and tear properties, as one of the raw materials to prepare a cast-type polyurethane elastomer;
[0021] Specifically, polyether polyol A, polyether polyol B, and isocyanate are polymerized in the stated weight proportions to obtain component A.
[0022] Weigh out MOCA according to the stated weight proportions to obtain component B. Preheat, mix, pour, and cure components A and B to obtain the final product.
[0023] The preheating temperature is 100℃-130℃; the pouring time is 180 s-300 s; the curing time is 12 h-24 h, and the curing temperature is 100℃.
[0024] Preferably, the method for mixing component A and component B is to stir at a speed of 2000-4000 rpm for 1-3 seconds.
[0025] The beneficial effects of this invention are as follows:
[0026] 1. The raw materials provided by this invention include polyether polyols that help improve tensile and tear properties. These polyether polyols that help improve tensile and tear properties have structures such as carbonate-ether coexistence. Adding these polyether polyols that help improve compressive strength to other raw materials of cast polyurethane elastomers can not only directly replace the existing raw materials for preparing poly-cast polyurethane elastomers, but also reduce the use of petroleum-based raw materials by minimizing the amount of epoxide used in the polyether polyol polymerization reaction. The resulting cast polyurethane elastomer has significantly improved tensile and tear strength.
[0027] 2. The present invention provides a polyether polyol that helps improve compressive strength. The polyether polyol has higher reactivity, which can reduce synthesis time and thus improve production efficiency. Furthermore, the polyurethane cast elastomer made from it has high tensile and tear strength.
[0028] 3. The polyether polyol provided by this invention, which helps to improve tear and tensile strength, can maximize carbon emission consumption while helping to improve tensile and tear strength, and the prepared product has higher environmental friendliness. Detailed Implementation
[0029] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, some features described in the examples may be combined in other examples.
[0030] Example 1
[0031] This embodiment presents a castable polyurethane elastomer comprising the following raw materials in parts by weight:
[0032] Polyether polyol A: 50 parts; Polyether polyol B: 50 parts; Isocyanate: 35 parts; p-dichloroaniline methane: 12 parts;
[0033] The polyether polyol A is obtained by using a small molecule polyol with a functionality of 3 as a starting agent, and epoxide and carbon dioxide as polymerization monomers, reacting under the action of a catalyst. Its molecular weight is 5500, and its structural formula is...
[0034]
[0035] A class of polyether polyols with an x / y ratio of 1:10;
[0036] The polyether polyol B is a CASE polyether polyol;
[0037] The CASE polyether polyol has the following characteristics: functionality of 3, molecular weight of 5500, hydroxyl value of 61 mgKOH / g, and viscosity of 4560 mPa·s / 25℃.
[0038] The isocyanate is toluene diisocyanate.
[0039] The amine chain extender is an aromatic diamine;
[0040] The aromatic diamine is one or more of 3,3'-dichloro-4,4'-diphenylmethane diamine, 3,5'-dimethylthiotoluene diamine, 3,5'-diethyltoluene diamine, 4,4'-methylenebis(3'-chloro-2,6'-diethylaniline), and 4,4'-methylenebis(2,6'-diethyl').
[0041] The amine chain extender is 3,3'-dichloro-4,4'-diphenylmethanediamine and / or 3,5'-dimethylthiotoluenediamine.
[0042] The small molecule polyol with a functionality of 3 is selected from ethylene glycol.
[0043] The epoxide is propylene oxide.
[0044] The initiator is propylene glycol.
[0045] The catalyst is a bimetallic catalyst (DMC).
[0046] Polyether polyol A is prepared by reacting ethylene glycol or propylene glycol as a starting agent, propylene oxide and carbon dioxide as polymerization monomers, and DMC as a catalyst in parts by weight.
[0047] Example 2
[0048] The difference between this embodiment and Embodiment 1 is that:
[0049] Cast-type polyurethane elastomer comprises the following raw materials in parts by weight:
[0050] Polyether polyol A: 0 parts; Polyether polyol B: 100 parts; Isocyanate: 20 parts; p-dichloroaniline methane: 10 parts;
[0051] The polyether polyol A is obtained by using a small molecule polyol with a functionality of 2 as a starting agent, epoxide and carbon dioxide as polymerization monomers, and reacting under the action of a catalyst. Its molecular weight is 1000, and its structural formula is [structure formula missing].
[0052]
[0053] A class of polyether polyols with an x / y ratio of 2:1;
[0054] The polyether polyol B is a CASE polyether polyol;
[0055] The CASE polyether polyol has the following characteristics: functionality of 2, molecular weight of 1000, hydroxyl value of 10 mgKOH / g, and viscosity of 100 mPa·s / 25℃.
[0056] The isocyanate is diphenylmethane diisocyanate.
[0057] The small molecule polyol with a functionality of 2 is selected from propylene glycol.
[0058] The epoxide is ethylene oxide.
[0059] The initiator is propylene glycol or ethylene glycol.
[0060] Example 3
[0061] The difference between this embodiment and Embodiment 1 is that:
[0062] Cast-type polyurethane elastomer comprises the following raw materials in parts by weight:
[0063] Polyether polyol A: 100 parts; Polyether polyol B: 0 parts; Isocyanate: 50 parts; p-dichloroaniline methane: 15 parts;
[0064] The polyether polyol A is obtained by using a small molecule polyol with a functionality of 4 as a starting agent, and epoxide and carbon dioxide as polymerization monomers, reacting under the action of a catalyst. Its molecular weight is 10,000, and its structural formula is [structure formula missing].
[0065]
[0066] A class of polyether polyols with an x / y ratio of 1:20;
[0067] The polyether polyol B is a CASE polyether polyol;
[0068] The CASE polyether polyol has the following characteristics: functionality of 4, molecular weight of 10000, hydroxyl value of 112 mgKOH / g, and viscosity of 9000 mPa·s / 25℃.
[0069] The isocyanates are toluene diisocyanate, diphenylmethane diisocyanate, modified diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and modified polymethylene polyphenyl polyisocyanate.
[0070] The small molecule polyol with a functionality of 4 is selected from ethylene glycol, propylene glycol, butanediol, diethylene glycol, neopentyl glycol, dipropylene glycol, methylpropanediol, glycerol, trimethylolpropane, and pentaerythritol.
[0071] The epoxide is propylene oxide, ethylene oxide, or butane oxide.
[0072] The initiator is ethylene glycol or diethylene glycol.
[0073] Example 4
[0074] This embodiment proposes a method for preparing a cast polyurethane elastomer, comprising the following steps: using polyether polyol A, which helps improve tensile and tear properties, as one of the raw materials to prepare a cast polyurethane elastomer;
[0075] Specifically, polyether polyol A, polyether polyol B, and isocyanate are polymerized in the stated weight proportions to obtain component A.
[0076] Weigh out MOCA according to the stated weight proportions to obtain component B. Preheat, mix, pour, and cure components A and B to obtain the final product.
[0077] The preheating temperature is 120℃; the pouring time is 240s; the curing time is 18h, and the curing temperature is 100℃.
[0078] The mixing method for components A and B is as follows: stirring at 3000 rpm for 2 seconds.
[0079] Example 5
[0080] The difference between this embodiment and embodiment 4 is that:
[0081] The preheating temperature is 100℃; the pouring time is 180s; the curing time is 12h, and the curing temperature is 100℃.
[0082] The method for mixing component A and component B is as follows: stir at 2000 rpm for 1 second.
[0083] Example 6
[0084] The difference between this embodiment and embodiment 4 is that:
[0085] The preheating temperature is 130℃; the pouring time is 300s; the curing time is 24h, and the curing temperature is 100℃.
[0086] The method for mixing component A and component B is as follows: stir at 4000 rpm for 3 seconds.
[0087] Example 7
[0088] In the following examples, polyether polyol D220 was purchased from Jiahe Chemical Technology Development (Shanghai) Co., Ltd. (hereinafter referred to as Jiahe), MOCA was purchased from Suzhou Xiangyuan Company, and toluene diisocyanate TDI was purchased from Wanhua Chemical Group Co., Ltd.
[0089] Example 1
[0090] 1.1 This embodiment provides a polyether polyol that helps improve tensile and tear strength, and a castable polyurethane elastomer containing the same, comprising the following steps:
[0091] This example provides a polyether polyol that helps improve tensile and tear strength and a castable polyurethane elastomer containing the same, comprising 100g of a prepolymer prepared from polyether polyol A with a number average molecular weight of 2000 and a hydroxyl value of 56mgKOH / g, and 11.5g of MOCA.
[0092] The polyether polyol A has a number average molecular weight of 2000 and a carbon dioxide monomer molar fraction of 24.1% in the entire polymer chain.
[0093] This example also provides a castable polyurethane prepolymer formulation comprising 3500g of the polyether polyol of this example which helps improve the tear and tensile properties of the polyurethane elastomer, and 680g of TDI with a theoretical NCO% set at 3.5%.
[0094] The preparation method of the above-mentioned cast-type polyurethane elastomer includes the following steps:
[0095] Weigh out the polyether polyol and polyol according to the formula weight, heat to 110℃, and dehydrate for 3 hours under a vacuum of 200 Pa. Then cool the material to 60℃, add toluene diisocyanate preheated in a 60℃ oven for 2 hours, stir, and react for 60 minutes at a controlled temperature of 95℃ and a vacuum of 100 Pa. After the reaction, maintain the discharge temperature at 85℃, discharge quickly under nitrogen protection, and seal in a fluorinated drum. Then cure in an 80℃ oven for 2 hours to obtain prepolymer component A.
[0096] Weigh 11.5g of MOCA, preheat the MOCA component with 100g of the component, mix, pour, and cure to obtain the final product. The preheating temperature is 100℃-130℃; the pouring time is 180s-300s; the curing time is 12h-24h, and the curing temperature is 100℃.
[0097] Example 2
[0098] 1.1 This example provides a polyether polyol that helps improve tensile and tear strength, and a castable polyurethane elastomer containing the same, comprising the following steps:
[0099] This example provides a polyether polyol that helps improve tensile and tear strength and a castable polyurethane elastomer containing the same, comprising 100g of a prepolymer prepared from polyether polyol A with a number average molecular weight of 2000 and a hydroxyl value of 56mgKOH / g, and 11.5g of MOCA.
[0100] The polyether polyol A has a number average molecular weight of 2000 and a carbon dioxide monomer molar fraction of 19.3% in the entire polymer chain.
[0101] This example also provides a castable polyurethane elastomer formulation comprising 3500g of the composition of this example which helps improve the moisture permeability of polyurethane, and 680g of TDI with a theoretical NCO% set at 3.5%.
[0102] The preparation method of the above-mentioned cast-type polyurethane elastomer includes the following steps:
[0103] Weigh out the polyether polyol and polyol according to the formula weight, heat to 110℃, and dehydrate for 3 hours under a vacuum of 200 Pa. Then cool the material to 60℃, add toluene diisocyanate preheated in a 60℃ oven for 2 hours, stir, and react for 60 minutes at a controlled temperature of 95℃ and a vacuum of 100 Pa. After the reaction, maintain the discharge temperature at 85℃, discharge quickly under nitrogen protection, and seal in a fluorinated drum. Then cure in an 80℃ oven for 2 hours to obtain prepolymer component A.
[0104] Weigh 11.5g of MOCA, preheat the MOCA component with 100g of the component, mix, pour, and cure to obtain the final product. The preheating temperature is 100℃-130℃; the pouring time is 180s-300s; the curing time is 12h-24h, and the curing temperature is 100℃.
[0105] Example 3
[0106] 1.1 This example provides a polyether polyol that helps improve tensile and tear strength, and a castable polyurethane elastomer containing the same, comprising the following steps:
[0107] This example provides a polyether polyol that helps improve tensile and tear strength and a castable polyurethane elastomer containing the same, comprising 100g of a prepolymer prepared from polyether polyol A with a number average molecular weight of 2000 and a hydroxyl value of 56mgKOH / g, and 11.5g of MOCA.
[0108] The polyether polyol A has a number average molecular weight of 2000 and a carbon dioxide monomer molar fraction of 16.1% in the entire polymer chain.
[0109] This example also provides a castable polyurethane elastomer formulation comprising 3500g of the composition of this example which helps improve the moisture permeability of polyurethane, and 680g of TDI with a theoretical NCO% set at 3.5%.
[0110] The preparation method of the above-mentioned cast-type polyurethane elastomer includes the following steps:
[0111] Weigh out the polyether polyol and polyol according to the formula weight, heat to 110℃, and dehydrate for 3 hours under a vacuum of 200 Pa. Then cool the material to 60℃, add toluene diisocyanate preheated in a 60℃ oven for 2 hours, stir, and react for 60 minutes at a controlled temperature of 95℃ and a vacuum of 100 Pa. After the reaction, maintain the discharge temperature at 85℃, discharge quickly under nitrogen protection, and seal in a fluorinated drum. Then cure in an 80℃ oven for 2 hours to obtain prepolymer component A.
[0112] Weigh 11.5g of MOCA, preheat the MOCA component with 100g of the component, mix, pour, and cure to obtain the final product. The preheating temperature is 100℃-130℃; the pouring time is 180s-300s; the curing time is 12h-24h, and the curing temperature is 100℃.
[0113] Example 4
[0114] 1.1 This example provides a polyether polyol that helps improve tensile and tear strength, and a castable polyurethane elastomer containing the same, comprising the following steps:
[0115] This example provides a polyether polyol that helps improve tensile and tear strength and a castable polyurethane elastomer containing the same, comprising 100g of a prepolymer prepared from polyether polyol A with a number average molecular weight of 1000 and a hydroxyl value of 56mgKOH / g, and 11.5g of MOCA.
[0116] The polyether polyol has a number average molecular weight of 1000 and the carbon dioxide monomer has a molar fraction of 16.1% in the entire polymer chain.
[0117] This example also provides a castable polyurethane elastomer formulation comprising 3500g of the composition of this example which helps improve the moisture permeability of polyurethane, and 680g of TDI with a theoretical NCO% set at 3.5%.
[0118] The preparation method of the above-mentioned cast-type polyurethane elastomer includes the following steps:
[0119] Weigh out the polyether polyol and polyol according to the formula weight, heat to 110℃, and dehydrate for 3 hours under a vacuum of 200 Pa. Then cool the material to 60℃, add toluene diisocyanate preheated in a 60℃ oven for 2 hours, stir, and react for 60 minutes at a controlled temperature of 95℃ and a vacuum of 100 Pa. After the reaction, maintain the discharge temperature at 85℃, discharge quickly under nitrogen protection, and seal in a fluorinated drum. Then cure in an 80℃ oven for 2 hours to obtain prepolymer component A.
[0120] Weigh 11.5g of MOCA, preheat the MOCA component with 100g of the component, mix, pour, and cure to obtain the final product. The preheating temperature is 100℃-130℃; the pouring time is 180s-300s; the curing time is 12h-24h, and the curing temperature is 100℃.
[0121] Example 5
[0122] 1.1 This example provides a polyether polyol that helps improve tensile and tear strength, and a castable polyurethane elastomer containing the same, comprising the following steps:
[0123] This example provides a polyether polyol that helps improve tensile and tear strength and a castable polyurethane elastomer containing the same, comprising 100g of a prepolymer prepared from polyether polyol A with a number average molecular weight of 10,000 and a hydroxyl value of 11.2 mg KOH / g, and 11.5g of MOCA.
[0124] The polyether polyol has a number average molecular weight of 1000 and the carbon dioxide monomer has a molar fraction of 16.1% in the entire polymer chain.
[0125] This example also provides a castable polyurethane elastomer formulation comprising 3500g of the composition of this example which helps improve the moisture permeability of polyurethane, and 680g of TDI with a theoretical NCO% set at 3.5%.
[0126] The preparation method of the above-mentioned cast-type polyurethane elastomer includes the following steps:
[0127] Weigh out the polyether polyol and polyol according to the formula weight, heat to 110℃, and dehydrate for 3 hours under a vacuum of 200 Pa. Then cool the material to 60℃, add toluene diisocyanate preheated in a 60℃ oven for 2 hours, stir, and react for 60 minutes at a controlled temperature of 95℃ and a vacuum of 100 Pa. After the reaction, maintain the discharge temperature at 85℃, discharge quickly under nitrogen protection, and seal in a fluorinated drum. Then cure in an 80℃ oven for 2 hours to obtain prepolymer component A.
[0128] Weigh 11.5g of MOCA, preheat the MOCA component with 100g of the component, mix, pour, and cure to obtain the final product. The preheating temperature is 100℃-130℃; the pouring time is 180s-300s; the curing time is 12h-24h, and the curing temperature is 100℃.
[0129] Comparative Example 1 (the only difference from Example 1 is that the polyether polyol used to improve tensile and tear strength in Example 1 is replaced with the polyether polyol prepared in Comparative Example 1)
[0130] 1.1 This example provides a polyether polyol that helps improve tensile and tear strength, and a castable polyurethane elastomer containing the same, comprising the following steps:
[0131] This example provides a polyether polyol that helps improve tensile and tear strength and a castable polyurethane elastomer containing the same, comprising 100g of a prepolymer made from a polyether polyol with a number average molecular weight of 2000 and 11.5g of MOCA.
[0132] In this example, the polyether polyol is provided by Jiahe Chemical, brand name D220, with a molecular weight of 2000 and a hydroxyl value of 56 mgKOH / g.
[0133] This example also provides a castable polyurethane elastomer formulation comprising 3500g of the composition of this example which helps improve the moisture permeability of polyurethane, and 680g of TDI with a theoretical NCO% set at 3.5%.
[0134] The preparation method of the above-mentioned cast-type polyurethane elastomer includes the following steps:
[0135] Weigh out the polyether polyol and polyol according to the formula weight, heat to 110℃, and dehydrate for 3 hours under a vacuum of 200 Pa. Then cool the material to 60℃, add toluene diisocyanate preheated in a 60℃ oven for 2 hours, stir, and react for 60 minutes at a controlled temperature of 95℃ and a vacuum of 100 Pa. After the reaction, maintain the discharge temperature at 85℃, discharge quickly under nitrogen protection, and seal in a fluorinated drum. Then cure in an 80℃ oven for 2 hours to obtain prepolymer component A.
[0136] Weigh 11.5g of MOCA, preheat the MOCA component with 100g of the component, mix, pour, and cure to obtain the final product. The preheating temperature is 100℃-130℃; the pouring time is 180s-300s; the curing time is 12h-24h, and the curing temperature is 100℃.
[0137] Comparative Example 2
[0138] 2.1 This example provides a polyether polyol that helps improve tensile and tear strength, and a castable polyurethane elastomer containing the same, comprising the following steps:
[0139] This example provides a polyether polyol that helps improve tensile and tear strength and a castable polyurethane elastomer containing the polyether polyol, comprising 100g of a prepolymer prepared from a polyether polyol with a number average molecular weight of 1000 and 11.5g of MOCA.
[0140] In this example, the polyether polyol is provided by Jiahe Chemical, brand name D210, with a molecular weight of 1000 and a hydroxyl value of 112 mgKOH / g.
[0141] This example also provides a castable polyurethane elastomer formulation comprising 3500g of the composition of this example which helps improve the moisture permeability of polyurethane, and 680g of TDI with a theoretical NCO% set at 3.5%.
[0142] The preparation method of the above-mentioned cast-type polyurethane elastomer includes the following steps:
[0143] Weigh out the polyether polyol and polyol according to the formula weight, heat to 110℃, and dehydrate for 3 hours under a vacuum of 200 Pa. Then cool the material to 60℃, add toluene diisocyanate preheated in a 60℃ oven for 2 hours, stir, and react for 60 minutes at a controlled temperature of 95℃ and a vacuum of 100 Pa. After the reaction, maintain the discharge temperature at 85℃, discharge quickly under nitrogen protection, and seal in a fluorinated drum. Then cure in an 80℃ oven for 2 hours to obtain prepolymer component A.
[0144] Weigh 11.5g of MOCA, preheat the MOCA component with 100g of the component, mix, pour, and cure to obtain the final product. The preheating temperature is 100℃-130℃; the pouring time is 180s-300s; the curing time is 12h-24h, and the curing temperature is 100℃.
[0145] Comparative Example 3
[0146] 2.1 This example provides a polyether polyol that helps improve tensile and tear strength, and a castable polyurethane elastomer containing the same, comprising the following steps:
[0147] This example provides a polyether polyol that helps improve tensile and tear strength and a castable polyurethane elastomer containing the polyether polyol, comprising 100g of a prepolymer prepared from a polyether polyol with a number average molecular weight of 10,000 and 11.5g of MOCA.
[0148] In this example, the polyether polyol has a molecular weight of 10,000, is synthesized entirely from PO monomers, and has a hydroxyl value of 11 mg KOH / g.
[0149] This example also provides a castable polyurethane elastomer formulation comprising 3500g of the composition of this example which helps improve the moisture permeability of polyurethane, and 680g of TDI with a theoretical NCO% set at 3.5%.
[0150] The preparation method of the above-mentioned cast-type polyurethane elastomer includes the following steps:
[0151] Weigh out the polyether polyol and polyol according to the formula weight, heat to 110℃, and dehydrate for 3 hours under a vacuum of 200 Pa. Then cool the material to 60℃, add toluene diisocyanate preheated in a 60℃ oven for 2 hours, stir, and react for 60 minutes at a controlled temperature of 95℃ and a vacuum of 100 Pa. After the reaction, maintain the discharge temperature at 85℃, discharge quickly under nitrogen protection, and seal in a fluorinated drum. Then cure in an 80℃ oven for 2 hours to obtain prepolymer component A.
[0152] Weigh 11.5g of MOCA, preheat the MOCA component with 100g of the component, mix, pour, and cure to obtain the final product. The preheating temperature is 100℃-130℃; the pouring time is 180s-300s; the curing time is 12h-24h, and the curing temperature is 100℃.
[0153] The cast-type polyurethane elastomers obtained in the examples and comparative examples above were cut into standard specimens, and then their physical and mechanical properties were tested. The preparation and testing methods of the standard specimens followed the national standard GB / T 10802-2006 "General Rubber and Other Elastomers" and its referenced testing standards. The test results are shown in Table 1 below:
[0154] Table 1. Performance test results of cast-type polyurethane elastomers prepared in Examples 1-5 and Comparative Examples 1-2
[0155]
[0156] Examples 1-5 and Comparative Examples 1-5 belong to cast polyurethane elastomers. As can be seen from Table 1, compared to Comparative Examples 1-3, the tensile strength and tear strength of the cast polyurethane elastomers prepared in Examples 1-5 of the present invention are significantly improved. Moreover, compared to Comparative Examples 1-3, the tensile strength and tear strength of the cast polyurethane elastomers prepared in Examples 1-5 of the present invention, by simply replacing the polyether polyol, are also superior to the comparative examples. This indicates that the polyether polyol used in the present invention to improve tensile and tear strength can significantly increase tensile and tear strength, while also shortening the prepolymer synthesis time by 50%, thereby greatly improving production efficiency and reducing production costs.
[0157] The embodiments of the present invention have been described above. However, the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make more equivalent embodiments under the guidance of the present embodiments, and all of them are within the protection scope of the present embodiments.
Claims
1. A cast polyurethane elastomer characterized in that, The raw materials include the following weight parts: Polyether polyol A: 0-100 parts; polyether polyol B: 0-100 parts; isocyanate: 20-50 parts; p-dianisidine methane: 10-15 parts; The polyether polyol A is obtained by using a small molecule polyol with a functionality of 2-4 as a starter, reacting with an epoxide and carbon dioxide as polymerization monomers under the action of a catalyst, and has a molecular weight of 1000-10000 and a structural formula ； (x / y ratio of 2:1 to 1:20) polyether polyol; The polyether polyol B is a CASE polyether polyol; the CASE polyether polyol specifically has a functionality of 2-4, a molecular weight of 1000-10000, a hydroxyl value of 10-112 mgKOH / g, and a viscosity of 100-9000 mPa·s / 25°C.
2. The cast polyurethane elastomer of claim 1, wherein, The isocyanate is one or more of toluene diisocyanate, diphenyl methane diisocyanate, modified diphenyl methane diisocyanate, poly methylene polyphenyl polyisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and modified poly methylene polyphenyl polyisocyanate.
3. The cast polyurethane elastomer of claim 2, wherein, The amine chain extender is an aromatic diamine.
4. The cast polyurethane elastomer of claim 1, wherein, The small molecule polyol with a functionality of 2-4 is at least one of ethylene glycol, propylene glycol, butanediol, diethylene glycol, neopentyl glycol, dipropylene glycol, methyl propylene glycol, glycerol, trimethylolpropane, and pentaerythritol.
5. The cast polyurethane elastomer of claim 1, wherein, The epoxide is at least one of propylene oxide, ethylene oxide, and butylene oxide.
6. The cast polyurethane elastomer of claim 1, wherein, The starter is one or two of propylene glycol, ethylene glycol, and diethylene glycol.
7. The polyether polyol of claim 1, wherein The catalyst is a bimetallic catalyst (DMC).
8. A process for the production of a cast polyurethane elastomer as claimed in any one of claims 1 to 7, characterised in that, The method includes the following steps: Polymerizing the polyether polyol A, the polyether polyol B, and the isocyanate in the weight parts, to obtain component A; Weighing the MOCA in the weight parts to obtain component B, preheating, mixing, pouring, and curing component A and component B, to obtain the product.
9. The method of preparing cast polyurethane elastomers according to claim 1, characterized in that, The preheating temperature is 100°C-130°C; the pouring time is 180 s-300 s; the curing time is 12 h-24 h, and the curing temperature is 100°C.
10. The method of making cast polyurethane elastomers according to claim 1, wherein, The mixing method of component A and component B is stirring at a speed of 2000-4000 rpm for 1-3 s.