High-stability multi-component hybrid structural adhesive for new energy lithium batteries and preparation method thereof

Abstract

The present invention relates to the technical field of polyurethane structural adhesives, and particularly to a high-stability multi-component hybrid structural adhesive for new energy lithium batteries and a preparation method thereof. The present invention realizes multi-component hybridization by carefully designing a polyurethane component A and a polyurethane component B, combined with the addition of a property-enhancing component A and a property-enhancing component B, and can significantly improve the stability and durability of the structural adhesive. This structural design helps to maintain long-term bonding strength and sealing performance in new energy lithium batteries, thereby improving the overall stability and safety of the batteries. In the preparation process of the polyurethane component A, the present invention adds a flame retardant plasticizer, a flame retardant inorganic filler and an antibacterial modified filler. The addition of these additives can not only improve the flame retardant properties of the structural adhesive, enabling it to maintain good stability under high temperature or fire conditions, but also give the structural adhesive a certain antibacterial ability, which helps to extend the service life and safety of the new energy lithium battery.

Description

Technical Field

[0001] The present invention relates to the technical field of polyurethane structural adhesives, and in particular to a high-stability multi-component hybrid structural adhesive for new energy lithium batteries and a preparation method thereof. Background Art

[0002] With the rapid development of new energy technologies, lithium batteries, as key components for energy storage and conversion, have been widely used in electric vehicles, energy storage systems, and portable electronic devices. However, the performance and safety of lithium batteries depend largely on their internal structure and material selection. Structural adhesives, as an important component in lithium battery manufacturing, not only secure and seal battery components but also directly affect the battery's thermal stability, mechanical strength, and electrochemical performance.

[0003] In recent years, multi-component hybrid structural adhesives have received widespread attention in the field of materials science due to their unique chemical structure and performance advantages. By hybridizing different types of polymers, inorganic fillers and functional additives, structural adhesives with excellent comprehensive performance can be prepared. However, there are relatively few types of structural adhesives used in lithium batteries in the existing technology. Therefore, how to prepare multi-component hybrid structural adhesives with high stability so that they can be better used in the lithium battery industry has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0004] In response to the above-mentioned shortcomings of the prior art, the present invention provides a high-stability multi-component hybrid structural adhesive for new energy lithium batteries and a preparation method thereof, aiming to prepare a multi-component hybrid structural adhesive with high stability so that it can be better applied in the lithium battery industry.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A high-stability multi-component hybrid structural adhesive for new energy lithium batteries, wherein the high-stability multi-component hybrid structural adhesive for new energy lithium batteries is composed of the following components: polyurethane component A, polyurethane component B, enhanced component A, enhanced component B, and dibutyltin dilaurate;

[0007] The polyurethane component A is a hydroxyl-terminated prepolymer prepared with castor oil, polyester diol, polyether polyol, diphenylmethane diisocyanate and trimethylolpropane as main raw materials;

[0008] The polyurethane component B is an isocyanate-terminated prepolymer prepared with castor oil and polymethylene polyphenyl polyisocyanate as main raw materials.

[0009] Furthermore, the preparation steps of the polyurethane component A are:

[0010] Step 1, weighing 50-60g of castor oil, 100-120g of polyester diol and 50-60g of polyether polyol into a flask, and dehydrating under vacuum at a temperature of 120°C for 2h, and the obtained mixture is recorded as a mixed component;

[0011] Step 2: Cool the mixed components to 60°C and place them in a stirred tank. Then, add 100-130g of diphenylmethane diisocyanate and heat to 80°C and stir for 2h. Then, add 10-20g of trimethylolpropane, 1-5g of fumed silica and 20-40g of calcium carbonate powder. After vigorously stirring, heat to 120°C and vacuum dehydrate for 2h. The result is recorded as the reaction component.

[0012] Step 3: After cooling the reaction components to 40°C, add 20-40g of flame retardant plasticizer, 30-50g of flame retardant inorganic filler, 5-10g of antibacterial modified filler and 1-5g of silane coupling agent KH-550, heat to 50°C, stir and react, and the result is polyurethane component A.

[0013] Furthermore, the vacuum degree of the vacuum in step 1 and step 2 is 0.095 MPa, the stirring speed of the mixing in step 2 is 500-600 r / min, the operation method of the strong stirring in step 2 is stirring at a stirring speed of 800-1000 r / min for 1 hour, and the operation method of the stirring reaction in step 3 is stirring at a stirring speed of 300-500 r / min for 1 hour.

[0014] Furthermore, the preparation method of the flame retardant inorganic filler in step 3 is:

[0015] Aluminum hydroxide, magnesium hydroxide, and zinc borate are weighed and mixed in a weight ratio of 3:2:1, and stirred at a stirring speed of 400 to 500 r / min for 10 minutes to obtain a flame retardant inorganic filler.

[0016] Furthermore, the preparation method of the antibacterial modified filler in step 3 is:

[0017] Tetradecyltrimethylammonium chloride, hexadecyldimethylammonium bromide, octadecyldimethylbenzylammonium bromide and dioctyldimethylammonium chloride are weighed in equal weight ratios, mixed, and stirred at a stirring speed of 300 to 400 r / min for 10 minutes to obtain an antibacterial modified filler.

[0018] Furthermore, the preparation method of the polyurethane component B is:

[0019] Weigh 20-30g of castor oil into a flask and heat it to 120°C. Vacuum dehydration is carried out under stirring for 2 hours. Then pour it into a stirring kettle and cool it to 70°C. Add 80-90g of polymethylene polyphenyl polyisocyanate and heat it to 80°C. Stir and mix to obtain the polyurethane B component.

[0020] Furthermore, in the preparation method of the polyurethane component B, the vacuum degree of the vacuum pumping is 0.095 MPa, the stirring speed of the stirring condition is 300 r / min, and the stirring and mixing operation method is stirring at a stirring speed of 200 r / min for 2 hours.

[0021] Furthermore, the preparation method of the property-enhancing component A is:

[0022] Calcium oxide, ultraviolet absorber and antioxidant 1010 were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component A.

[0023] Furthermore, the preparation method of the property-enhancing component B is:

[0024] Antioxidant 3114 and carbodiimide were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component B.

[0025] A method for preparing a high-stability multi-component hybrid structural adhesive for new energy lithium batteries, the preparation method comprising:

[0026] S1. Add 1 to 2 parts by weight of the property-enhancing component A to 45 to 60 parts by weight of the polyurethane component A, and stir at a stirring speed of 200 r / min for 5 minutes. The result is recorded as component A;

[0027] S2. Add 0.3 to 0.5 parts by weight of the property-enhancing component B to 10 to 15 parts by weight of the polyurethane component B, and stir at a stirring speed of 200 r / min for 5 minutes to obtain the resultant product as the component B;

[0028] S3. Mix component A and component B and add 0.3 to 0.5 parts by weight of dibutyltin dilaurate. Stir at a stirring speed of 500 r / min for 10 minutes to obtain a high-stability multi-component hybrid structural adhesive for new energy lithium batteries.

[0029] The present invention provides a high-stability multi-component hybrid structural adhesive for new energy lithium batteries and a preparation method thereof. Compared with the existing known technology, the present invention has the following beneficial effects:

[0030] 1. The present invention achieves multi-hybridization through the careful design of polyurethane component A and polyurethane component B, combined with the addition of property-enhancing component A and property-enhancing component B, which can significantly improve the stability and durability of the structural adhesive. This structural design helps to maintain long-term bonding strength and sealing performance in new energy lithium batteries, thereby improving the overall stability and safety of the battery.

[0031] 2. In the preparation process of the polyurethane component A, the present invention adds a flame retardant plasticizer, a flame retardant inorganic filler and an antibacterial modified filler. The addition of these additives can not only improve the flame retardant properties of the structural adhesive, enabling it to maintain good stability under high temperature or fire conditions, but also give the structural adhesive a certain antibacterial ability, which helps to extend the service life and safety of new energy lithium batteries.

[0032] 3. The addition of the property-enhancing component A and the property-enhancing component B in the present invention can further enhance the environmental adaptability of the structural adhesive. The introduction of additives such as calcium oxide, UV absorbers, and antioxidants can improve the weather resistance and antioxidant properties of the structural adhesive, enabling it to maintain stable performance in harsh environments. Moreover, the entire preparation process is relatively simple and easy to control, and the required raw materials and equipment are all conventional materials, which can reduce production costs and preparation difficulty. Furthermore, the preparation steps are clear and well-defined, facilitating industrial production and promotion. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0034] The present invention will be further described below with reference to the embodiments.

[0035] The sources of some components in the Examples and Comparative Examples are as follows:

[0036] Castor oil, industrial grade, Shandong Weifang Zhenghua Chemical Co., Ltd.;

[0037] Polyester diol, hydroxyl value 20~500mg / g, industrial grade, Shandong Bluestar Dongda Chemical Co., Ltd.

[0038] Polyether polyol, industrial grade, Sinopec Shanghai Gaoqiao Petrochemical Company;

[0039] Methylene diphenyl diisocyanate, technical grade, Huntsman Chemical Co., Ltd.;

[0040] Trimethylolpropane, industrial grade, Shanghai Hersbit Chemical Co., Ltd.;

[0041] Fumed silica, technical grade, Wacker Chemie Co., Ltd.;

[0042] Calcium carbonate micropowder, 800 mesh, Shanghai Fengchen Powder Material Co., Ltd.;

[0043] Flame retardant plasticizer, trioctyl phosphate (model FR-CDP), Dongguan Xingyuan Chemical Co., Ltd.

[0044] Silane coupling agent KH-550, industrial grade, Shanghai Enchang Industry and Trade Co., Ltd.;

[0045] Aluminum hydroxide, industrial grade, Jinan Jiuding New Materials Industry Co., Ltd.;

[0046] Magnesium hydroxide, industrial grade, Jinan Jiuding New Materials Industry Co., Ltd.

[0047] Zinc borate, industrial grade, Jinan Jiuding New Materials Industry Co., Ltd.

[0048] Tetradecyltrimethylammonium chloride, industrial grade, Jiangsu Runfeng Synthetic Technology Co., Ltd.;

[0049] Hexadecyldimethylammonium bromide, industrial grade, Jiangsu Pulex Biotechnology Co., Ltd.

[0050] Octadecyldimethylbenzylammonium bromide, industrial grade, Xiamen Xianduan Technology Co., Ltd.

[0051] Dioctyldimethylammonium chloride, industrial grade, Jinan Quanxing New Materials Co., Ltd.;

[0052] Polymethylene polyphenyl polyisocyanate, industrial grade, Yantai Wanhua Polyurethane Co., Ltd.;

[0053] Calcium oxide, industrial grade, Tianjin Biboyuan Technology Development Co., Ltd.;

[0054] UV absorber, industrial grade, model UV-234, Dongguan Xingyuan Chemical Co., Ltd.

[0055] Antioxidant 1010, industrial grade, Jiangsu Xinluda Polymer Materials Co., Ltd.;

[0056] Antioxidant 3114, industrial grade, Nanjing Milan Chemical Co., Ltd.;

[0057] Carbodiimide, industrial grade, Suzhou Keshengtong New Materials Technology;

[0058] Dibutyltin dilaurate, industrial grade, Shanghai Lingfeng Chemical Reagent Co., Ltd.

[0059] Example 1: The high-stability multi-component hybrid structural adhesive for new energy lithium batteries of this embodiment is composed of the following components: polyurethane component A, polyurethane component B, enhanced component A, enhanced component B and dibutyltin dilaurate;

[0060] The polyurethane component A is a hydroxyl-terminated prepolymer prepared with castor oil, polyester diol, polyether polyol, diphenylmethane diisocyanate and trimethylolpropane as main raw materials;

[0061] The preparation steps of polyurethane A component are:

[0062] Step 1, weighing 50g of castor oil, 100g of polyester diol and 50g of polyether polyol into a flask, and decompressing and dehydrating the mixture at a temperature of 120°C and a vacuum degree of 0.095MPa for 2h, and the resultant mixture was recorded as a mixed component;

[0063] Step 2: Cool the mixed components to 60°C and put them into a stirred tank. Then, add 100g of diphenylmethane diisocyanate and heat it to 80°C and stir at a stirring speed of 500r / min for 2h. Then, add 10g of trimethylolpropane, 1g of fumed silica and 20g of calcium carbonate powder. Stir at a stirring speed of 800r / min for 1h, then heat it to 120°C and dehydrate it at a vacuum degree of 0.095MPa for 2h. The result is recorded as the reaction component;

[0064] Step 3: After cooling the reaction components to 40°C, add 20g of flame retardant plasticizer, 30g of flame retardant inorganic filler, 5g of antibacterial modified filler and 1g of silane coupling agent KH-550, heat to 50°C and stir at a stirring speed of 300r / min for 1h to obtain polyurethane component A.

[0065] The preparation method of the flame retardant inorganic filler in step 3 is:

[0066] Aluminum hydroxide, magnesium hydroxide, and zinc borate were weighed and mixed in a weight ratio of 3:2:1, and stirred at a stirring speed of 400 r / min for 10 minutes to obtain a flame retardant inorganic filler.

[0067] The preparation method of the antibacterial modified filler in step 3 is:

[0068] Tetradecyltrimethylammonium chloride, hexadecyldimethylammonium bromide, octadecyldimethylbenzylammonium bromide and dioctyldimethylammonium chloride were weighed and mixed in equal weight ratios, and stirred at a stirring speed of 300 r / min for 10 minutes to obtain an antibacterial modified filler.

[0069] The polyurethane component B is an isocyanate-terminated prepolymer prepared with castor oil and polymethylene polyphenyl polyisocyanate as main raw materials.

[0070] The preparation method of polyurethane component B is as follows:

[0071] Weigh 20 g of castor oil into a flask and heat it to 120°C. Dehydrate it at a vacuum degree of 0.095 MPa for 2 h at a stirring speed of 300 r / min. Then pour it into a stirring kettle and cool it to 70°C. Add 80 g of polymethylene polyphenyl polyisocyanate and raise the temperature to 80°C. Stir at a stirring speed of 200 r / min for 2 h to obtain the polyurethane B component.

[0072] The preparation method of the property-enhancing component A is as follows:

[0073] Calcium oxide, ultraviolet absorber and antioxidant 1010 were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component A.

[0074] The preparation method of the property-enhancing component B is as follows:

[0075] Antioxidant 3114 and carbodiimide were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component B.

[0076] A method for preparing a high-stability multi-component hybrid structural adhesive for new energy lithium batteries, the preparation method being:

[0077] S1. Add 1 part by weight of the property-enhancing component A to 45 parts by weight of the polyurethane component A, and stir at a stirring speed of 200 r / min for 5 minutes. The result is recorded as component A;

[0078] S2. Add 0.3 parts by weight of the property-enhancing component B to 10 parts by weight of the polyurethane component B, and stir at a stirring speed of 200 r / min for 5 minutes. The result is recorded as the component B;

[0079] S3. Component A and component B are mixed and 0.3 parts by weight of dibutyltin dilaurate is added, and the mixture is stirred at a stirring speed of 500 r / min for 10 minutes to obtain a high-stability multi-component hybrid structural adhesive for new energy lithium batteries.

[0080] Example 2: The high-stability multi-component hybrid structural adhesive for new energy lithium batteries of this embodiment is composed of the following components: polyurethane component A, polyurethane component B, enhanced component A, enhanced component B and dibutyltin dilaurate;

[0081] The polyurethane component A is a hydroxyl-terminated prepolymer prepared with castor oil, polyester diol, polyether polyol, diphenylmethane diisocyanate and trimethylolpropane as main raw materials;

[0082] The preparation steps of polyurethane A component are:

[0083] Step 1, weighing 60g of castor oil, 120g of polyester diol and 60g of polyether polyol into a flask, and decompressing and dehydrating the mixture at a temperature of 120°C and a vacuum degree of 0.095MPa for 2h, and the resultant mixture was recorded as a mixed component;

[0084] Step 2: Cool the mixed components to 60°C and put them into a stirred tank. Then, add 130g of diphenylmethane diisocyanate and heat it to 80°C and stir at a stirring speed of 600r / min for 2h. Then, add 20g of trimethylolpropane, 5g of fumed silica and 40g of calcium carbonate powder. Stir at a stirring speed of 1000r / min for 1h, then heat it to 120°C and dehydrate it at a vacuum degree of 0.095MPa for 2h. The result is recorded as the reaction component;

[0085] Step 3: After cooling the reaction components to 40°C, add 40g of flame retardant plasticizer, 50g of flame retardant inorganic filler, 10g of antibacterial modified filler and 5g of silane coupling agent KH-550, heat to 50°C and stir at a stirring speed of 500r / min for 1h to obtain polyurethane component A.

[0086] The preparation method of the flame retardant inorganic filler in step 3 is:

[0087] Aluminum hydroxide, magnesium hydroxide, and zinc borate were weighed and mixed in a weight ratio of 3:2:1, and stirred at a stirring speed of 500 r / min for 10 minutes to obtain a flame retardant inorganic filler.

[0088] The preparation method of the antibacterial modified filler in step 3 is:

[0089] Tetradecyltrimethylammonium chloride, hexadecyldimethylammonium bromide, octadecyldimethylbenzylammonium bromide and dioctyldimethylammonium chloride were weighed and mixed in equal weight ratios, and stirred at a stirring speed of 400 r / min for 10 minutes to obtain an antibacterial modified filler.

[0090] The polyurethane component B is an isocyanate-terminated prepolymer prepared with castor oil and polymethylene polyphenyl polyisocyanate as main raw materials.

[0091] The preparation method of polyurethane component B is as follows:

[0092] Weigh 30 g of castor oil and pour it into a flask, heat it to 120°C, and dehydrate it at a vacuum degree of 0.095 MPa for 2 hours at a stirring speed of 300 r / min. Then pour it into a stirring kettle and cool it to 70°C. After adding 90 g of polymethylene polyphenyl polyisocyanate, heat it to 80°C, and stir it at a stirring speed of 200 r / min for 2 hours to obtain the polyurethane B component.

[0093] The preparation method of the property-enhancing component A is as follows:

[0094] Calcium oxide, ultraviolet absorber and antioxidant 1010 were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component A.

[0095] The preparation method of the property-enhancing component B is as follows:

[0096] Antioxidant 3114 and carbodiimide were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component B.

[0097] A method for preparing a high-stability multi-component hybrid structural adhesive for new energy lithium batteries, the preparation method being:

[0098] S1. Add 2 parts by weight of the property-enhancing component A to 60 parts by weight of the polyurethane component A, and stir at a stirring speed of 200 r / min for 5 minutes. The result is recorded as component A;

[0099] S2. Add 0.5 parts by weight of the property-enhancing component B to 15 parts by weight of the polyurethane component B, and stir at a stirring speed of 200 r / min for 5 minutes. The result is recorded as the component B;

[0100] S3. Component A and component B are mixed and 0.5 parts by weight of dibutyltin dilaurate is added, and the mixture is stirred at a stirring speed of 500 r / min for 10 minutes to obtain a high-stability multi-component hybrid structural adhesive for new energy lithium batteries.

[0101] Example 3: The high-stability multi-component hybrid structural adhesive for new energy lithium batteries of this embodiment is composed of the following components: polyurethane component A, polyurethane component B, enhanced component A, enhanced component B and dibutyltin dilaurate;

[0102] The polyurethane component A is a hydroxyl-terminated prepolymer prepared with castor oil, polyester diol, polyether polyol, diphenylmethane diisocyanate and trimethylolpropane as main raw materials;

[0103] The preparation steps of polyurethane A component are:

[0104] Step 1, weighing 55g of castor oil, 110g of polyester diol and 55g of polyether polyol into a flask, and decompressing and dehydrating the mixture at a temperature of 120°C and a vacuum degree of 0.095MPa for 2h, and the resultant mixture was recorded as a mixed component;

[0105] Step 2: Cool the mixed components to 60°C and put them into a stirred tank. Then, add 120g of diphenylmethane diisocyanate and heat it to 80°C and stir at a stirring speed of 600r / min for 2h. Then, add 15g of trimethylolpropane, 3g of fumed silica and 30g of calcium carbonate powder. Stir at a stirring speed of 900r / min for 1h, then heat it to 120°C and dehydrate it at a vacuum degree of 0.095MPa for 2h. The result is recorded as the reaction component;

[0106] Step 3: After cooling the reaction components to 40°C, 30g of flame retardant plasticizer, 40g of flame retardant inorganic filler, 8g of antibacterial modified filler and 3g of silane coupling agent KH-550 were added, and the temperature was raised to 50°C and stirred at a stirring speed of 400r / min for 1h to obtain polyurethane component A.

[0107] The preparation method of the flame retardant inorganic filler in step 3 is:

[0108] Aluminum hydroxide, magnesium hydroxide, and zinc borate were weighed and mixed in a weight ratio of 3:2:1, and stirred at a stirring speed of 500 r / min for 10 minutes to obtain a flame retardant inorganic filler.

[0109] The preparation method of the antibacterial modified filler in step 3 is:

[0110] Tetradecyltrimethylammonium chloride, hexadecyldimethylammonium bromide, octadecyldimethylbenzylammonium bromide and dioctyldimethylammonium chloride were weighed and mixed in equal weight ratios, and stirred at a stirring speed of 400 r / min for 10 minutes to obtain an antibacterial modified filler.

[0111] The polyurethane component B is an isocyanate-terminated prepolymer prepared with castor oil and polymethylene polyphenyl polyisocyanate as main raw materials.

[0112] The preparation method of polyurethane component B is as follows:

[0113] Weigh 25 g of castor oil into a flask and heat it to 120°C. Dehydrate it at a vacuum degree of 0.095 MPa for 2 h at a stirring speed of 300 r / min. Then pour it into a stirring kettle and cool it to 70°C. Add 85 g of polymethylene polyphenyl polyisocyanate and raise the temperature to 80°C. Stir at a stirring speed of 200 r / min for 2 h to obtain the polyurethane B component.

[0114] The preparation method of the property-enhancing component A is as follows:

[0115] Calcium oxide, ultraviolet absorber and antioxidant 1010 were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component A.

[0116] The preparation method of the property-enhancing component B is as follows:

[0117] Antioxidant 3114 and carbodiimide were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component B.

[0118] A method for preparing a high-stability multi-component hybrid structural adhesive for new energy lithium batteries, the preparation method being:

[0119] S1. Add 2 parts by weight of the property-enhancing component A to 53 parts by weight of the polyurethane component A, and stir at a stirring speed of 200 r / min for 5 minutes. The result is recorded as component A;

[0120] S2. Add 0.4 parts by weight of the property-enhancing component B to 13 parts by weight of the polyurethane component B, and stir at a stirring speed of 200 r / min for 5 minutes. The result is recorded as the component B;

[0121] S3. Component A and component B are mixed and 0.4 parts by weight of dibutyltin dilaurate is added, and the mixture is stirred at a stirring speed of 500 r / min for 10 minutes to obtain a high-stability multi-component hybrid structural adhesive for new energy lithium batteries.

[0122] Comparative Example 1: The high-stability multi-component hybrid structural adhesive for new energy lithium batteries and the preparation method thereof provided in this comparative example are substantially the same as those in Example 1, with the main difference being that the flame-retardant inorganic filler in Example 1 is not added in this comparative example 1.

[0123] Comparative Example 2: The high-stability multi-component hybrid structural adhesive for new energy lithium batteries and its preparation method provided in this comparative example are roughly the same as those in Example 1, with the main difference being that the property-enhancing component A in Example 1 is not added in this comparative example 2.

[0124] Comparative Example 3: The high-stability multi-component hybrid structural adhesive for new energy lithium batteries and its preparation method provided in this comparative example are roughly the same as those in Example 1, with the main difference being that the property-enhancing component B in Example 1 is not added in this comparative example 3.

[0125] Performance testing:

[0126] The high-stability multi-component hybrid structural adhesives for new energy lithium batteries prepared in Examples 1-3 and Comparative Examples 1-3 are marked as Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3, respectively. The performance of Examples 1-3 and Comparative Examples 1-3 was tested. The specific testing methods and test items are as follows:

[0127] 1. The tensile strength of Examples 1-3 and Comparative Examples 1-3 was tested with reference to the standard of GB / T528-2009, and the obtained data are recorded in Table 1;

[0128] 2. The shear strength of Examples 1-3 and Comparative Examples 1-3 was tested with reference to the standard of GB / T7124-1986. The obtained data are recorded in Table 1.

[0129] 3. The limiting oxygen index of Examples 1-3 and Comparative Examples 1-3 was tested with reference to the standard of GB / T 2406.2-2009, and the obtained data are recorded in Table 1;

[0130] 4. The limiting oxygen index of Examples 1-3 and Comparative Examples 1-3 was tested according to the standard of GJB 446-1988, and the obtained data are recorded in Table 1;

[0131] Table 1: Performance test data of multi-hybrid structural adhesive

[0132] Tensile strength MPa Shear strength MPa Limiting oxygen index% Peel strength N / cm Example 1 11.98 13.11 31.65 43.65 Example 2 11.96 13.16 30.98 42.21 Example 3 12.07 12.98 30.67 43.17 Comparative Example 1 10.98 11.98 24.65 41.69 Comparative Example 2 9.98 11.56 23.79 41.39 Comparative Example 3 10.21 11.21 24.15 42.16

[0133] The data in the table above show that the mechanical properties and flame retardant properties of the high-stability multi-component hybrid structural adhesive for new energy lithium batteries in Examples 1-3 are better than those in Comparative Examples 1-3, indicating that the addition of flame-retardant inorganic fillers, property-enhancing component A, and property-enhancing component B in the preparation of the high-stability multi-component hybrid structural adhesive for new energy lithium batteries can improve the performance.

[0134] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A high-stability multi-component hybrid structural adhesive for new energy lithium batteries, characterized in that: The high-stability multi-component hybrid structural adhesive for new energy lithium batteries is composed of the following components: polyurethane component A, polyurethane component B, enhanced component A, enhanced component B and dibutyltin dilaurate; The polyurethane component A is a hydroxyl-terminated prepolymer prepared with castor oil, polyester diol, polyether polyol, diphenylmethane diisocyanate and trimethylolpropane as main raw materials; The polyurethane component B is an isocyanate-terminated prepolymer prepared with castor oil and polymethylene polyphenyl polyisocyanate as main raw materials; The preparation steps of the polyurethane A component are: Step 1, weighing 50-60g of castor oil, 100-120g of polyester diol and 50-60g of polyether polyol into a flask, and dehydrating under vacuum at a temperature of 120°C for 2h, and the obtained mixture is recorded as a mixed component; Step 2: Cool the mixed components to 60°C and place them in a stirred tank. Then, add 100-130g of diphenylmethane diisocyanate and heat to 80°C and stir for 2h. Then, add 10-20g of trimethylolpropane, 1-5g of fumed silica and 20-40g of calcium carbonate powder. After vigorously stirring, heat to 120°C and vacuum dehydrate for 2h. The result is recorded as the reaction component. Step 3: After cooling the reaction components to 40° C., 20-40 g of flame retardant plasticizer, 30-50 g of flame retardant inorganic filler, 5-10 g of antibacterial modified filler and 1-5 g of silane coupling agent KH-550 were added, and the mixture was heated to 50° C. and stirred for reaction to obtain the polyurethane component A; The preparation method of the antibacterial modified filler in step 3 is: Tetradecyltrimethylammonium chloride, hexadecyldimethylammonium bromide, octadecyldimethylbenzylammonium bromide and dioctyldimethylammonium chloride were weighed and mixed in equal weight ratios, and stirred at a stirring speed of 300 to 400 r / min for 10 minutes to obtain an antibacterial modified filler. The preparation method of the polyurethane B component is: Weigh 20-30g of castor oil into a flask and heat to 120°C. Vacuum dehydration is carried out under stirring for 2 hours. Then, the castor oil is poured into a stirred tank and cooled to 70°C. 80-90g of polymethylene polyphenyl polyisocyanate is added and the temperature is raised to 80°C. The mixture is stirred and mixed to obtain the polyurethane component B. The preparation method of the property-enhancing component A is as follows: Calcium oxide, ultraviolet absorber and antioxidant 1010 were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component A. The preparation method of the property-enhancing component B is as follows: Antioxidant 3114 and carbodiimide were weighed and mixed in equal weight ratios, poured into a ball mill and milled for 5 minutes to obtain the property-enhancing component B.

2. The high-stability multi-component hybrid structural adhesive for new energy lithium batteries according to claim 1, characterized in that: The vacuum degree of the vacuum in step 1 and step 2 is 0.095 MPa, the stirring speed of the mixing in step 2 is 500-600 r / min, the operation method of the strong stirring in step 2 is stirring at a stirring speed of 800-1000 r / min for 1 hour, and the operation method of the stirring reaction in step 3 is stirring at a stirring speed of 300-500 r / min for 1 hour.

3. The high-stability multi-component hybrid structural adhesive for new energy lithium batteries according to claim 1, characterized in that: The preparation method of the flame retardant inorganic filler in step 3 is: Aluminum hydroxide, magnesium hydroxide, and zinc borate are weighed and mixed in a weight ratio of 3:2:1, and stirred at a stirring speed of 400 to 500 r / min for 10 minutes to obtain a flame retardant inorganic filler.

4. The high-stability multi-component hybrid structural adhesive for new energy lithium batteries according to claim 1, characterized in that: In the preparation method of the polyurethane component B, the vacuum degree of the vacuum pumping is 0.095 MPa, the stirring speed of the stirring condition is 300 r / min, and the stirring and mixing operation method is to stir at a stirring speed of 200 r / min for 2 hours.

5. The method for preparing a high-stability multi-component hybrid structural adhesive for new energy lithium batteries according to any one of claims 1 to 4, characterized in that: The preparation method is: S1. Add 1 to 2 parts by weight of the property-enhancing component A to 45 to 60 parts by weight of the polyurethane component A, and stir at a stirring speed of 200 r / min for 5 minutes. The result is recorded as component A; S2. Add 0.3 to 0.5 parts by weight of the property-enhancing component B to 10 to 15 parts by weight of the polyurethane component B, and stir at a stirring speed of 200 r / min for 5 minutes to obtain the resultant product as the component B; S3. Mix component A and component B and add 0.3 to 0.5 parts by weight of dibutyltin dilaurate. Stir at a stirring speed of 500 r / min for 10 minutes to obtain a high-stability multi-component hybrid structural adhesive for new energy lithium batteries.