CN108832065A - A kind of high-performance AGM partition and preparation method thereof - Google Patents

Abstract

The present invention relates to a kind of high-performance AGM partitions and preparation method thereof, belong to battery technology field, the AGM partition is by weight, the medium-alkali glass fibre cotton for being 1.4-1.8 μm containing 70-80 parts of fibre diameters, the medium-alkali glass fibre cotton and 5-10 parts of bicomponent fibres that 15-20 parts of fibre diameters are 2.4-2.8 μm.AGM baffle porosity >=95%, maximum diameter of hole are 15-16 μm, chlorinity≤0.002%, intensity >=1200N/m, while also having good resilience and high tensile strength, are used in lead-acid accumulator, can significantly improve battery life.Meanwhile the preparation method of the AGM partition uses wet therapy forming process, and it is simple, convenient, it is suitble to industrialized production.

Description

A kind of high-performance AGM separator and preparation method thereof

technical field

The invention belongs to the technical field of storage batteries, and in particular relates to a high-performance AGM separator and a preparation method thereof.

Background technique

The battery separator is a porous insulating material, which is placed between the positive and negative plates of the battery to separate the positive and negative plates and play the role of insulation to avoid short circuit of the battery. At the same time, the ions that participate in the chemical reaction are allowed to pass through during the charging and discharging process of the battery. For the sealed maintenance-free battery, it is also necessary to ensure that the oxygen precipitated from the positive electrode reaches the negative electrode through the separator to complete oxygen absorption. At present, the traditional separators commonly used in China include AGM separators, PVC separators, PP separators, etc. Among them, AGM separators are new materials with excellent mechanical, physical and chemical properties. As a very important part of the lead-acid battery besides the positive plate and the negative plate, the separator has a great influence on the performance of the lead-acid battery, especially the valve-regulated lead-acid battery (VRLA), so it is also called As the third electrode of VRLA battery. Since the AGM separator was applied to sealed lead-acid batteries around 1970 and achieved good application results, it has been widely used in lead-acid batteries and plays a very important role in VRLA batteries.

Lead-acid battery is currently the world's largest and most widely used battery, but the control of chlorine content in the battery is still a difficult problem to be solved. Chloride ions, as impurity ions, will cause sulfation of the positive plate of the lead-acid battery, and after continuous charge-discharge cycle reactions, the plate will be seriously damaged, prone to explosion hazards. AGM separator is an important part of lead-acid battery, controlling the chloride ion content of AGM separator will directly improve the final performance of lead-acid battery.

Contents of the invention

In view of this, one of the objectives of the present invention is to provide a method for preparing a high-performance AGM separator; the second objective is to provide a high-performance AGM separator.

To achieve the above object, the present invention provides the following technical solutions:

1. A high-performance AGM separator. In parts by weight, the AGM separator contains 70-80 parts of medium-alkali glass fiber wool with a fiber diameter of 1.4-1.8 μm, and 15-20 parts of a fiber diameter of 2.4-2.8 μm Medium-alkali glass fiber cotton and 5-10 parts of bicomponent fiber.

Further, the medium-alkali glass fiber wool with a fiber diameter of 2.4-2.8 μm is prepared by centrifugation.

Further, the porosity of the AGM separator is ≥95%, the maximum pore diameter is 15-16 μm, and the chlorine content is ≤0.002%.

2. A method for preparing a high-performance AGM separator, said method comprising the steps of:

(1) Slurry dispersion: Take 70-80 parts of medium-alkali glass fiber cotton with a fiber diameter of 1.4-1.8 μm, 15-20 parts of medium-alkali glass fiber cotton with a fiber diameter of 2.4-2.8 μm and 5-10 parts of double-group Separate the fibers, add them to three dispersion pools, beat and disperse under the condition of pH value 2.0-3.5, and obtain three kinds of slurries;

(2) Mixed slurry: mixing the three kinds of slurry obtained in step (1) to obtain a mixed slurry, adding deionized water to the mixed slurry until the mass concentration of the mixed slurry is 0.1-0.5%;

(3) Forming: adjust the pH value of the mixed slurry treated in step (2) to 2.0-4.0, pass through the deslagging machine after deslagging, and finally make wet paper on the former, and suck the wet paper Dehydration treatment to a moisture content of 10-20%;

(4) Drying: dry the wet paper treated in step (3) until the moisture content is less than 0.2%.

Further, in step (1), the degree of beating is 28-30°SR when the beating is dispersed, and the beating time is 5-10min.

Further, in step (2), deionized water is added to the mixed slurry until the mass concentration of the mixed slurry is 0.2-0.5%.

Further, in step (3), the former is an inclined wire forming paper machine.

Further, in step (3), the suction dehydration treatment is divided into three stages, the first stage is suction dehydration treatment at a vacuum of 0.2-0.3MPa to a moisture content of 50-70%, and the second stage is at Suction dehydration treatment at a vacuum degree of 0.3-0.4 MPa to a moisture content of 30-50%, and in the third stage, suction dehydration treatment at a vacuum degree of 0.4-0.5 MPa to a moisture content rate of 10-20%.

Further, in step (3), the drying process is divided into three stages, the first stage is drying at 180-200°C until the moisture content of the wet paper is 10-15%, and using a dehumidification fan to dry the The hot air generated in the first stage is discharged to the outside of the drying room; the second stage is dried at 160-180°C until the moisture content of the wet paper is 5-10%, and the third stage is dried at 130-160°C until the wet paper The moisture content of the paper is less than 0.2%, and the hot air generated in the second and third stages is recycled in each stage in the drying room.

The beneficial effect of the present invention is: the present invention provides a kind of high-performance AGM separator and preparation method thereof, in the preparation process of this AGM separator, limit to 70-80 parts of medium-alkali glass fiber wool with a fiber diameter of 1.4-1.8 μm , 15-20 parts of medium-alkali glass fiber cotton with a fiber diameter of 2.4-2.8 μm and 5-10 parts of bi-component fiber are used as raw materials. On the one hand, medium-alkali glass fiber has stable chemical properties and is made of medium-alkali glass fiber cotton The AGM separator can improve the acid resistance of the AGM separator, making it resistant to acid boiling time ≥ 10 minutes, thereby improving the service life of the battery. The pore size distribution of the prepared partition makes the maximum pore diameter 15-16 μm, the porosity ≥ 95%, and reduces the resistance of the partition. Among them, the medium-alkali glass fiber wool with a fiber diameter of 2.4-2.8 μm is obtained by centrifugation, and a stable fiber structure is built with it, and the fiber with a smaller diameter is filled to ensure the strength of the final AGM separator. The separator has good resilience, improves the dry and wet fatigue resistance of the separator, and is also conducive to improving the sealing reaction efficiency of the gas, reducing gas evolution and water loss, and prolonging the service life of the battery. In addition, the bicomponent fiber used is a composite fiber, the inner fiber core is a good polymer, its shape and structure will not change under acid and heat environmental conditions, and the outer sheath fiber is a A polymer that can be melted during the manufacturing process. This melting can make special fibers stick to any glass fiber. When the temperature drops to room temperature or battery operating temperature, the melted part becomes tough again and has strength. Reinforcement, so that the strength of the final prepared AGM separator is ≥1200N/m, which can make the AGM separator have high puncture resistance strength, high tensile strength and good resilience in dry and wet states. In addition, the use of deionized water is limited in the preparation process, so that the chlorine content in the finally prepared AGM separator is ≤0.002%, thereby improving the service life of the battery. The preparation method of the AGM separator adopts a wet forming process, the operation is simple and convenient, and it is suitable for industrial production.

Detailed ways

Preferred embodiments of the present invention will be described in detail below.

Example 1

Preparation of High Performance AGM Separator

(1) Slurry dispersion: Take 70 parts of medium-alkali glass fiber cotton with a fiber diameter of 1.4-1.8 μm, 20 parts of medium-alkali glass fiber cotton with a fiber diameter of 2.4-2.8 μm and 10 parts of bi-component fibers, add three In each dispersion tank, beating and dispersing for 10 min with a beating degree of 28.5 ° SR under the condition of pH value of 2.0 to obtain three kinds of slurries, wherein the medium-alkali glass fiber cotton with a fiber diameter of 2.4-2.8 μm is produced by centrifugation;

(2) Mixed slurry: Mix the three kinds of slurry obtained in step (1) to obtain a mixed slurry, add deionized water to the mixed slurry until the mass concentration of the mixed slurry is 0.1%;

(3) Forming: adjust the pH value of the mixed slurry processed in step (2) to be 2.0, pass through the deslagging machine after deslagging, and finally make wet paper on the inclined wire forming paper machine, first wet paper in a vacuum degree of Suction dehydration treatment at 0.25MPa to a moisture content of 60%, then suction dehydration treatment at a vacuum degree of 0.3MPa to a moisture content rate of 40%, and finally suction dehydration treatment at a vacuum degree of 0.45MPa to a moisture content The rate is 15%;

(4) Drying: place the wet paper treated in step (3) in a drying room, and carry out drying treatment in three stages, the first stage is to dry at 185°C until the moisture content of the wet paper is 12% , and the hot air generated in the first stage is discharged out of the drying room by a dehumidifying fan; the second stage is dried at 170°C until the moisture content of the wet paper is 8%, and the third stage is dried at 145°C to The moisture content of the wet paper is 0.1%, and the hot air generated in the second stage and the third stage is recycled in each stage in the drying room to produce a high-performance AGM separator.

Example 2

Preparation of High Performance AGM Separator

(1) Slurry dispersion: Take 75 parts of medium-alkali glass fiber cotton with a fiber diameter of 1.4-1.8 μm, 18 parts of medium-alkali glass fiber cotton with a fiber diameter of 2.4-2.8 μm and 7 parts of bicomponent fibers, add three In each dispersion tank, beating and dispersing for 8 minutes with a beating degree of 29.5 ° SR under the condition of pH value of 3 to obtain three kinds of slurry, wherein the medium-alkali glass fiber wool with a fiber diameter of 2.4-2.8 μm is produced by centrifugation;

(2) Mixed slurry: Mix the three kinds of slurry obtained in step (1) to obtain a mixed slurry, add deionized water to the mixed slurry until the mass concentration of the mixed slurry is 0.3%;

(3) Forming: adjust the pH value of the mixed slurry after step (2) to be 3, pass through the deslagging machine after deslagging, and finally make wet paper on the inclined wire forming paper machine. Suction dehydration treatment at 0.2MPa to moisture content of 50%, then suction dehydration treatment at vacuum degree of 0.3MPa to moisture content rate of 30%, and finally suction dehydration treatment at vacuum degree of 0.4MPa to moisture content The rate is 10%;

(4) Drying: place the wet paper treated in step (3) in a drying room, and carry out drying treatment in three stages, the first stage is to dry at 180°C until the moisture content of the wet paper is 10% , and the hot air generated in the first stage is discharged out of the drying room by a dehumidifying fan; the second stage is dried at 160°C until the moisture content of the wet paper is 5%, and the third stage is dried at 130°C to The moisture content of the wet paper is 0.15%, and the hot air generated in the second stage and the third stage is recycled in each stage in the drying room to produce a high-performance AGM separator.

Example 3

Preparation of High Performance AGM Separator

(1) Slurry dispersion: Take 80 parts of medium-alkali glass fiber cotton with a fiber diameter of 1.4-1.8 μm, 15 parts of medium-alkali glass fiber cotton with a fiber diameter of 2.4-2.8 μm and 5 parts of bi-component fibers, add three In each dispersion tank, beating and dispersing for 5 minutes with a beating degree of 30 ° SR under the condition of pH value of 3.5 to obtain three kinds of slurries, wherein the medium-alkali glass fiber wool with a fiber diameter of 2.4-2.8 μm is produced by centrifugation;

(2) Mixed slurry: Mix the three kinds of slurry obtained in step (1) to obtain a mixed slurry, add deionized water to the mixed slurry until the mass concentration of the mixed slurry is 0.5%;

(3) Forming: adjust the pH value of the mixed slurry after step (2) to be 4.0, pass through the deslagging machine after deslagging, and finally make wet paper on the inclined wire forming paper machine, first wet paper in a vacuum degree of Suction dehydration treatment at 0.3MPa to a moisture content of 70%, then suction dehydration treatment at a vacuum degree of 0.4MPa to a moisture content rate of 50%, and finally suction dehydration treatment at a vacuum degree of 0.5MPa to a moisture content The rate is 20%;

(4) Drying: place the wet paper treated in step (3) in a drying room, and carry out drying treatment in three stages, the first stage is to dry at 200°C until the moisture content of the wet paper is 15% , and the hot air generated in the first stage is discharged out of the drying room by a dehumidifying fan; the second stage is dried at 180°C until the moisture content of the wet paper is 10%, and the third stage is dried at 160°C to The moisture content of the wet paper is 0.12%, and the hot air generated in the second and third stages is recycled in each stage in the drying room to produce a high-performance AGM separator.

The relevant performances of the high-performance AGM separators prepared in Examples 1-3 were measured, and the test results are shown in Table 1.

The performance measurement result of the AGM separator prepared in the embodiment 1-3 of table 1

As can be seen from Table 1, the AGM separator prepared by the method of the present invention has low chlorine content, high porosity, large acid absorption capacity, long acid boiling time, and high strength. It is used in lead-acid batteries, which can obviously improve the battery life. life.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in terms of form and Various changes may be made in the details without departing from the scope of the invention defined by the claims.

Claims (9)

1. a kind of high-performance AGM partition, which is characterized in that by weight, the AGM partition contains 70-80 parts of fibre diameters For 1.4-1.8 μm of medium-alkali glass fibre cotton, the medium-alkali glass fibre cotton and 5-10 that 15-20 parts of fibre diameters are 2.4-2.8 μm Part bicomponent fibre.

2. a kind of high-performance AGM partition as described in claim 1, which is characterized in that the fibre diameter is 2.4-2.8 μm Medium-alkali glass fibre cotton is made by centrifugal process.

3. a kind of high-performance AGM partition as described in claim 1, which is characterized in that AGM baffle porosity >=95%, Maximum diameter of hole is 15-16 μm, chlorinity≤0.002%.

4. a kind of described in any item preparation methods of high-performance AGM partition of claim 1-3, which is characterized in that the method Include the following steps：

(1) slurry disperses：Taking 70-80 parts of fibre diameters is 1.4-1.8 μm of medium-alkali glass fibre cotton, 15-20 parts of fibre diameters For 2.4-2.8 μm of medium-alkali glass fibre cotton and 5-10 parts of bicomponent fibres, it is separately added into three dispersion ponds, is in pH value It is beaten dispersion under conditions of 2.0-3.5, obtains three kinds of slurries；

(2) mixed slurry：The three kinds of slurries obtained in step (1) are mixed and obtain mixed slurry, are added into the mixed slurry The mass concentration for entering deionized water to mixed slurry is 0.1-0.5%；

(3) it forms：Adjusting the pH value through step (2) treated mixed slurry is 2.0-4.0, by fluffer after slagging-off, most Afterwards to l Water Paper obtained on former, the l Water Paper is carried out suction dehydration to handle to moisture percentage being 10-20%；

(4) dry：It will treated that l Water Paper is dried to moisture content < 0.2% through step (3).

5. method as claimed in claim 4, which is characterized in that in step (1), beating degree is 28-30 ° when the mashing disperses SR, beating time 5-10min.

6. method as claimed in claim 4, which is characterized in that in step (2), deionized water is added into the mixed slurry Mass concentration to mixed slurry is 0.2-0.5%.

7. method as claimed in claim 4, which is characterized in that in step (3), the former is inclined-wire form paper machine.

8. method as claimed in claim 4, which is characterized in that in step (3), the suction dehydration processing is divided into three ranks Section, it is 50-70% that the first stage, suction dehydration, which was handled to moisture percentage, in the case where vacuum degree is 0.2-0.3MPa, and second stage is in vacuum It is 30-50% that degree, which is that suction dehydration is handled to moisture percentage under 0.3-0.4MPa, and the phase III is in the case where vacuum degree is 0.4-0.5MPa It is 10-20% that suction dehydration, which is handled to moisture percentage,.

9. method as claimed in claim 4, which is characterized in that in step (3), the drying process is divided into three phases, the One stage was 10-15% to be dried at 180-200 DEG C to the l Water Paper moisture content, and used wet-emitting blower by first rank The hot-air that section generates drains into outside drying chamber；It is 5-10% that second stage, which is dried at 160-180 DEG C to the l Water Paper moisture content, the Three stages were dried at 130-160 DEG C to the l Water Paper moisture content < 0.2%, and the second stage and phase III are generated Hot-air each step cycle in the drying chamber utilizes.