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Preparation method for waterborne PMMA composite coating diaphragm

A water-based coating and coating technology, applied in non-aqueous electrolyte batteries, electrical components, circuits, etc., can solve the problems of decreased product production efficiency, unfavorable product lightweight, increased thickness and weight, etc. Deformation and stability improvement effect

Active Publication Date: 2017-08-15
NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The invention patent with the application number CN 201410445356.6 discloses a diaphragm, which is composed of a ceramic material layer coated on the surface of the base film and a PVDF polymer adhesive layer coated on the outer surface of the ceramic layer, which improves the resistance of the diaphragm. Thermal performance, but compared with the original film, the gas permeability loss of the coated diaphragm is larger, which hinders the conduction of lithium ions and increases the internal resistance of the lithium battery; the coating process is complicated, resulting in a decrease in product production efficiency, and the increase in thickness and weight is not conducive to Lightweight products; the crystallinity of PVDF is about 50%, which is not conducive to the conduction of lithium ions in lithium batteries
PMMA and its copolymers are amorphous polymers with good heat resistance and liquid absorption and moisturizing properties. Because of the presence of carbonyl groups, their affinity for electrolytes is enhanced. Compared with PVDF, PMMA has better Large liquid absorption rate, but the mechanical properties of PMMA and its copolymers are poor, not wear-resistant and easy to be scratched, and the dendrites generated during the use of lithium batteries are easy to pierce the diaphragm and cause internal short circuits in the battery

Method used

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  • Preparation method for waterborne PMMA composite coating diaphragm
  • Preparation method for waterborne PMMA composite coating diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Under a nitrogen atmosphere, add 25g of 1,2-diaminocyclohexane into 500g of tetrahydrofuran, stir until completely dissolved, then add 100g of PMMA with a molecular weight of 10,000g / mol, reflux for 6h, cool, filter with suction, and vacuum dry for 10h Finally, the modified PMMA powder is obtained.

[0020] 2) Add 80g of the above-mentioned modified PMMA powder to 500g of deionized water, mix and stir until completely dissolved, then add 200g of alumina powder, mix and stir at 30-50°C until the powder is evenly dispersed, finally add 10g of CMC, mix well and ball mill 0.5 ~2h to obtain aqueous mixed slurry. The above water-based mixed slurry is coated on one side of the 15 μm PP base film by anilox roller coating to form a water-based coating, and then dried in an oven at 30-80°C for 1-5 minutes to obtain the product. The thickness of the water-based coating is 4 μm.

Embodiment 2

[0022] 1) Under a nitrogen atmosphere, add 50g of 1,6-diaminocyclohexane into 500g of tetrahydrofuran, stir until completely dissolved, then add 25g of methyl methacrylate and ethylacrylic acid copolymer with a molecular weight of 50,000g / mol, and reflux the reaction 5h, cooling, suction filtration, obtain modified PMMA copolymer powder after vacuum drying 10h;

[0023] 2) Add 80g of the above-mentioned modified PMMA copolymer powder to 500g of deionized water, mix and stir until completely dissolved, then add 100g of magnesium oxide powder, mix and stir at 30-50°C until the powder is evenly dispersed, and finally add 10g of sodium alginate, Mix evenly and ball mill for 0.5-2 hours to obtain an aqueous mixed slurry. The above water-based mixed slurry is coated on one side of the 15 μm PP base film by roll coating to form a water-based coating, and then dried in an oven at 30-80°C for 1-5 minutes to obtain the product. The thickness of the water-based coating is 4 μm.

Embodiment 3

[0025] 1) Under a nitrogen atmosphere, add 100g of 1,2-diaminocyclopentane into 500g of tetrahydrofuran, stir until completely dissolved, then add 200g of methyl methacrylate and ethyl methacrylate copolymer with a molecular weight of 80000g / mol, Reflux reaction for 7h, cooling, suction filtration, and vacuum drying for 10h to obtain modified PMMA copolymer powder;

[0026] 2) Add 80g of the above-mentioned modified PMMA copolymer powder to 500g of deionized water, mix and stir until completely dissolved, then add 200g of magnesium hydroxide powder, mix and stir at 30-50°C until the powder is evenly dispersed, and finally add 10g of polyvinyl alcohol , mixed evenly and ball milled for 0.5-2 hours to obtain an aqueous mixed slurry. The above-mentioned water-based mixed slurry is coated on one side of the 15 μm PP base film by solt-die coating method to form a water-based coating, and then dried in an oven at 30-80 °C for 1-5 minutes to obtain the product. The thickness of the w...

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Abstract

The invention provides a preparation method for a waterborne PMMA composite coating diaphragm. The coating diaphragm is formed by coating one side or two sides of a polyolefin base membrane with mixed paste of modified PMMA and ceramic in one time; and the modified PMMA is obtained by performing crosslinking and modifying on the PMMA and a copolymer thereof by a crosslinking agent based on a certain proportion. The diaphragm is prepared from the mixed materials of the modified PMMA and the copolymer thereof and ceramic in a coating manner; and the coating layer only needs coating of one time, so that production cost is lowered, ventilation loss caused by thickness of the coating layer also can be lowered, and meanwhile, the thermal stability of the diaphragm is improved.

Description

technical field [0001] The invention relates to the technical field of coated diaphragms, in particular to a preparation method of a water-based PMMA composite coated diaphragm. Background technique [0002] The invention patent with the application number CN 201410445356.6 discloses a diaphragm, which is composed of a ceramic material layer coated on the surface of the base film and a PVDF polymer adhesive layer coated on the outer surface of the ceramic layer, which improves the resistance of the diaphragm. Thermal performance, but compared with the original film, the gas permeability loss of the coated diaphragm is larger, which hinders the conduction of lithium ions and increases the internal resistance of the lithium battery; the coating process is complicated, resulting in a decrease in product production efficiency, and the increase in thickness and weight is not conducive to Lightweight products; the crystallinity of PVDF is about 50%, which is not conducive to the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/414H01M50/434H01M50/446
CPCH01M10/052H01M50/403H01M50/446H01M50/411H01M50/449Y02E60/10
Inventor 杨浩田王晓明韦程李景树
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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