A battery separator filling conditioner and preparation method thereof

Abstract

The invention discloses a battery separator filling conditioner and a preparation method thereof. The main components of the battery separator filling conditioner include a base oil composition, a pour point depressant, and an antioxidant. The base oil composition includes a paraffin-based neutral oil and a cycloalkyl neutral oil. The components of the battery separator filling conditioner are calculated by weight as follows: 98-100 parts of the base oil composition, 0.5-1.0 parts of polymethacrylate (PMA), and 1-2 parts of the antioxidant. The components of the base oil composition are calculated by weight as follows: 80-90 parts of the paraffin-based neutral oil and 10-20 parts of the cycloalkyl neutral oil, and the total number of the paraffin-based neutral oil and the cycloalkyl neutral oil is 98-100 parts. The filling conditioner prepared by the invention has a light appearance color, moderate viscosity, a low pour point, a high flash point, low volatilization loss, and an extremely low sulfur content. It also has good antioxidant performance and suitable solubility, and has good material compatibility.

Description

Technical Field

[0001] The invention relates to the field of metal cutting, and in particular to a battery separator filling conditioner and a preparation method thereof. Background Art

[0002] In recent years, the battery manufacturing industry has developed rapidly, with manufacturing levels and production efficiency significantly improved and breaking through. Production automation has replaced traditional manufacturing processes, and product adaptability has gradually increased. With the rapid development of modern industry, especially the rapid development and application of automobiles, high-speed railways, aviation, medical equipment, etc., higher requirements have been placed on the performance of batteries. At the same time, there are also higher requirements and expectations for technological development and innovation in the battery industry, as well as product iteration. The separator, known as the "third electrode", plays a vital role in the high performance of batteries. As a filler and conditioner, one of the raw materials for manufacturing battery separators, it is mainly used in the process of uniform mixing and extrusion molding. It plays a key role in the color, porosity, puncture resistance, lateral elongation, and aging resistance of the separator material.

[0003] However, the following problems are still common in conventional separator filling oils and separators produced in the prior art: (1) The separator oil is dark in color and cannot fully meet the color requirements of the separator; (2) The antioxidant performance is insufficient, which seriously affects the elongation and ductility of the separator; (3) The separator oil contains too many low-component components, has a large amount of high-temperature development, and has a poor operating environment, making it difficult to extrude bubbles from the separator; (4) The sulfur content of the separator oil is too high, which not only cannot meet the requirements of the acid corrosion test, but also causes the formation of flocs on the electrolyte surface due to motor discharge during the use of the separator; (5) The material compatibility is poor, and the solvent cannot wash out the excess filling oil, resulting in the porosity, pore size and resistance performance of the separator failing to meet the requirements. Summary of the Invention

[0004] In response to the above technical problems in the related art, the present invention proposes a battery separator filling conditioner and a preparation method thereof, which can solve the above problems.

[0005] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows:

[0006] A battery separator filling conditioner and a preparation method thereof, wherein the main components of the conditioner include a base oil composition, a pour point depressant (polymethacrylate (PMA)), and an antioxidant (3,5-di-tert-butyl-4-hydroxyphenylpropionate). The base oil composition includes a paraffin-based neutral oil (SN-1) and a cycloalkyl neutral oil (DN-2). The components of the battery separator filling conditioner are calculated by weight as follows: 98-100 parts of the base oil composition, 0.5-1.0 parts of the polymethacrylate (PMA), and 1-2 parts of the antioxidant (3,5-di-tert-butyl-4-hydroxyphenylpropionate). The components of the base oil composition are calculated by weight as follows: 80-90 parts of the paraffin-based neutral oil (SN-1) and 10-20 parts of the cycloalkyl neutral oil (DN-2), with the total of the paraffin-based neutral oil and DN-2 being 98-100 parts.

[0007] Furthermore, the preparation method comprises the following steps:

[0008] S1: preparing a base oil composition A: placing a paraffinic neutral oil (SN-1) and a cycloalkyl neutral oil (DN-2) in a container, and stirring the container until the temperature rises to a temperature range to obtain a base oil composition A;

[0009] S2: preparing base oil composition B: subjecting base oil composition A to molecular distillation to obtain base oil composition B;

[0010] S3 cooling: After the S2 process is completed, the base oil composition B is cooled in the container to the temperature range required by the S4 process;

[0011] S4: preparing base oil composition C: subjecting base oil composition B to an activated carbon adsorption process to obtain base oil composition C;

[0012] S5 Adding auxiliary materials: adding polymethacrylate PMA and 3,5-di-tert-butyl-4-hydroxyphenylpropionate isooctyl ester to a container in sequence, and mixing with the base oil composition C to form a final mixture D;

[0013] S6 Filter out the finished product: Cool at room temperature and perform precision filtration on the final mixture D to obtain the battery separator filling conditioner.

[0014] Furthermore, in step S1, the components of the base oil composition are calculated by mass as follows: 80-90 parts of paraffin-based neutral oil (SN-1) and 10-20 parts of cycloalkyl neutral oil (DN-2), and the total mass of the two is 98-100 parts. The temperature range is 30°C-40°C, and the stirring time is 30 minutes.

[0015] Furthermore, in step S2, the components of the final mixture D are calculated by mass as follows: 98-100 parts of the base oil composition; 0.5-1.0 parts of polymethacrylate (PMA); and 1-2 parts of an antioxidant (isooctyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate). The temperature of the molecular distillation process equipment is 210° C.-220° C.

[0016] Furthermore, in step S3, the base oil composition B is cooled in a range of 45°C to 55°C.

[0017] Furthermore, in step S4, the activated carbon adsorption process processes 5-6 KL / h.

[0018] Furthermore, in step S5, the stirring time is 60 minutes.

[0019] Furthermore, in step S6, the precision of the fine filtration is no more than 1 μm.

[0020] Furthermore, the container is a normal pressure blending kettle.

[0021] Furthermore, the cooling temperature ranges from 35°C to 45°C.

[0022] Beneficial effects:

[0023] The filling conditioner prepared in the present invention has a light appearance color, which meets the color requirements of the separator; the viscosity is moderate and the pour point is low, which is convenient for material mixing under low temperature environment conditions; the flash point is high, the volatilization loss is small, and the extrusion molding operation is safe; the sulfur content is extremely low, which largely prevents the formation of flocs due to the freeing of sulfur ions to the electrolyte surface during the discharge process; the low aniline point and reasonable C-type distribution ensure that the filling conditioner has good compatibility and antioxidant ability; the filling conditioner has good antioxidant performance, which enhances the aging resistance of the separator to a certain extent; the suitable solubility can well control the porosity, pore size, resistivity, flexibility, sealability, etc. of the separator while being washed out by the solvent; the recovered conditioner has a high utilization rate, less waste, and significantly reduces costs and increases efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] The present invention will be described in further detail below with reference to the accompanying drawings.

[0026] Figure 1This is a data table of various indicators of the battery separator filling conditioner prepared in Example 1;

[0027] Figure 2 This is a data table of various indicators of the battery separator filling conditioner prepared in Example 2;

[0028] Figure 3 This is a data table of various indicators of the battery separator filling conditioner prepared in Example 3. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the battery separator filling conditioner and the preparation method thereof will be further described below with reference to the accompanying drawings and specific implementation methods.

[0030] A battery separator filling conditioner and a preparation method thereof, wherein the main components of the conditioner include a base oil composition, a pour point depressant (polymethacrylate (PMA)), and an antioxidant (isooctyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate); the base oil composition includes a paraffin-based neutral oil (SN-1) and a cycloalkyl neutral oil (DN-2); the components of the battery separator filling conditioner are calculated in parts by mass as follows: 98-100 parts of the base oil composition, 0.5-1.0 parts of polymethacrylate (PMA), and 1-2 parts of the antioxidant (isooctyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate); and the components of the base oil composition are calculated in parts by mass as follows: 80-90 parts of the paraffin-based neutral oil (SN-1) and 10-20 parts of the cycloalkyl neutral oil (DN-2), with the total of the paraffin-based neutral oil and DN-2 being 98-100 parts.

[0031] The above-mentioned preparation method comprises the following steps:

[0032] S1: preparing a base oil composition A: placing a paraffinic neutral oil (SN-1) and a cycloalkyl neutral oil (DN-2) in a container, and stirring the container until the temperature rises to a temperature range to obtain a base oil composition A;

[0033] S2: preparing base oil composition B: subjecting base oil composition A to molecular distillation to obtain base oil composition B;

[0034] S3 cooling: After the S2 process is completed, the base oil composition B is cooled in the container to the temperature range required by the S4 process;

[0035] S4: preparing base oil composition C: subjecting base oil composition B to an activated carbon adsorption process to obtain base oil composition C;

[0036] S5 Adding auxiliary materials: adding polymethacrylate PMA and 3,5-di-tert-butyl-4-hydroxyphenylpropionate isooctyl ester to a container in sequence, and mixing with the base oil composition C to form a final mixture D;

[0037] S6 Filter out the finished product: Cool at room temperature and perform precision filtration on the final mixture D to obtain the battery separator filling conditioner.

[0038] In the above step S1, the components of the base oil composition are calculated by mass as follows: 80-90 parts of paraffin-based neutral oil (SN-1) and 10-20 parts of cycloalkyl neutral oil (DN-2), and the total mass of the two is 98-100 parts; the temperature range is 30°C-40°C, and the stirring time is 30 minutes.

[0039] In the above step S2, the components of the final mixture D are calculated by weight as follows: 98-100 parts of the base oil composition; 0.5-1.0 parts of polymethacrylate (PMA); and 1-2 parts of an antioxidant (isooctyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate). The temperature of the molecular distillation process equipment is 210° C.-220° C.

[0040] In the above-mentioned step S3, the base oil composition B is cooled to a temperature ranging from 45°C to 55°C.

[0041] In the above-mentioned step S4, the activated carbon adsorption process processes 5-6 KL / h.

[0042] In the above step S5, the stirring time is 60 minutes.

[0043] In the above-mentioned step S6, the precision of the precise filtration is no more than 1 μm.

[0044] The above-mentioned container is a normal pressure blending kettle.

[0045] The above cooling temperature ranges from 35°C to 45°C.

[0046] The technical solutions and technical effects of the present invention will be further described below with reference to specific embodiments.

[0047] Example 1

[0048] This embodiment provides a method for preparing a battery separator filling conditioner:

[0049] (1) 85 parts of paraffin-based neutral oil (SN-1) and 10 parts of cycloalkyl neutral oil (DN-2) were placed in a blending kettle, stirred and heated to 30°C-40°C, and stirred for 30 minutes to obtain base oil composition A;

[0050] (2) subjecting the base oil composition A to molecular distillation at a process temperature of 210°C to 220°C to obtain a base oil composition B;

[0051] (3) Cooling the base oil composition B to 45°C to 55°C and treating it with activated carbon adsorption to obtain a base oil composition C;

[0052] (4) 0.5 parts of polymethacrylate (PMA) and 1.0 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionate were added to the final base oil composition C in sequence, and the mixture was stirred for 60 minutes. The mixture was cooled to 35°C-45°C and finely filtered with a filtration accuracy of 1 μm. Finally, a battery separator filling conditioner prepared by a special process was obtained.

[0053] Example 2

[0054] This embodiment provides a method for preparing a battery separator filling conditioner:

[0055] (1) 88 parts of paraffin-based neutral oil (SN-1) and 15 parts of cycloalkyl neutral oil (DN-2) were placed in a blending kettle, stirred and heated to 30°C-40°C, and stirred for 30 minutes to obtain base oil composition A;

[0056] (2) subjecting the base oil composition A to molecular distillation at a process temperature of 210°C to 220°C to obtain a base oil composition B;

[0057] (3) Cooling the base oil composition B to 45°C to 55°C and treating it with activated carbon adsorption to obtain a base oil composition C;

[0058] (4) 0.6 parts of polymethacrylate (PMA) and 1.2 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionate are sequentially added to the final base oil composition C, stirred for 60 minutes, cooled to 35°C-45°C, and finely filtered with a filtration accuracy of 1 μm to obtain a battery separator filling conditioner prepared by a special process.

[0059] Example 3

[0060] This embodiment provides a method for preparing a battery separator filling conditioner:

[0061] (1) Place 90 parts of paraffin-based neutral oil (SN-1) and 18 parts of cycloalkyl neutral oil (DN-2) in a blending kettle, stir and heat to 30°C-40°C, and stir for 30 minutes to obtain base oil composition A;

[0062] (2) subjecting the base oil composition A to molecular distillation at a process temperature of 210°C to 220°C to obtain a base oil composition B;

[0063] (3) Cooling the base oil composition B to 45°C to 55°C and treating it with activated carbon adsorption to obtain a base oil composition C;

[0064] (4) 0.5 parts of polymethacrylate (PMA) and 1.3 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionate are sequentially added to the final base oil composition C, stirred for 60 minutes, cooled to 35°C-45°C, and finely filtered with a filtration accuracy of 1 μm to obtain a battery separator filling conditioner prepared by a special process.

[0065] The test results of various indicators of the products in the embodiments are shown in the figure. Combining the above embodiments and test results, it can be seen that through the above technical scheme of the present invention, compared with the existing technology, the battery separator filling conditioner prepared by the special process provided by the present invention and the battery separator material processed and manufactured using the same have the following characteristics and performance advantages: the filling conditioner has a light appearance color, which meets the color requirements of the separator; moderate viscosity and low pour point, which facilitate material mixing under low temperature conditions; high flash point, low volatilization loss, and safe extrusion molding operation; extremely low sulfur content, which largely prevents the formation of flocs due to the freeing of sulfur ions to the electrolyte surface during the discharge process; low aniline point and reasonable C-type distribution, which ensure that the filling conditioner has good compatibility and antioxidant capacity; the filling conditioner has good antioxidant performance, which enhances the aging resistance of the separator to a certain extent; suitable solubility, while being washed out by the solvent, it is good to control the porosity, pore size, resistivity, flexibility, sealability, etc. of the separator; the recovered conditioner has a high utilization rate, less waste, and significant cost reduction and efficiency improvement. This will overcome the shortcomings of traditional technology, achieve product iteration, replace imported products of the same type, and fill the domestic gap in special conditioners for battery separators.

[0066] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a battery separator filling conditioner, characterized in that: The preparation method comprises the following steps: S1: preparing base oil composition A: placing paraffin-based neutral oil (SN-1) and cycloalkyl neutral oil (DN-2) in a container, stirring the container until the temperature rises to a temperature range of 30°C to 40°C, to obtain base oil composition A. The components of the base oil composition A are calculated by weight as follows: 80-90 parts of paraffin-based neutral oil (SN-1), 10-20 parts of cycloalkyl neutral oil (DN-2), and the total weight of the two is 98-100 parts; S2: preparing base oil composition B: subjecting base oil composition A to molecular distillation to obtain base oil composition B, wherein the temperature of the molecular distillation equipment is 210° C.-220° C.; S3 cooling: After the S2 process is completed, the base oil composition B is cooled in the container to the temperature range required by the S4 process. The cooling range of the base oil composition B is 45°C-55°C; S4: preparing base oil composition C: subjecting base oil composition B to an activated carbon adsorption process to obtain base oil composition C; S5 Adding auxiliary materials: polymethacrylate PMA and 3,5-di-tert-butyl-4-hydroxyphenylpropionate isooctyl ester are sequentially added into a container, and mixed with the base oil composition C to form a final mixture D, wherein the components of the final mixture D are calculated by weight as follows: 98-100 parts of the base oil composition; 0.5-1.0 parts of polymethacrylate PMA; and 1-2 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionate. S6 Filter out the finished product: Cool at room temperature and perform precision filtration on the final mixture D to obtain the battery separator filling conditioner.

2. The method for preparing a battery separator filling conditioner according to claim 1, characterized in that: The stirring time in step S1 is 30 min.

3. The method for preparing a battery separator filling conditioner according to claim 1, wherein: In step S4, the activated carbon adsorption process processes 5-6 KL / h.

4. The method for preparing a battery separator filling conditioner according to claim 1, characterized in that: In step S5, the stirring time is 60 minutes.

5. The method for preparing a battery separator filling conditioner according to claim 1, characterized in that: In step S6, the precision of the precise filtration is no more than 1 μm.

6. The method for preparing a battery separator filling conditioner according to claim 1, characterized in that: The container is a normal pressure blending kettle.

7. The method for preparing a battery separator filling conditioner according to claim 1, characterized in that: In step S6, the cooling temperature ranges from 35°C to 45°C.

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