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A kind of aqueous polymer coating slurry and its application

A water-based polymer and polymer technology, applied in polyurea/polyurethane coatings, coatings, structural parts, etc., can solve problems such as high cost, environmental pollution, and inconvenient coating of diaphragms, and achieve the goal of improving stability and reducing settlement Effect

Active Publication Date: 2022-01-04
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, polymer-coated diaphragms need to use organic solvents, which not only have high cost, low efficiency, complicated procedures, pollute the environment, and affect the health of operators, but also because organic solvents are easy to volatilize during the preparation process, the batch uniformity of polymer-coated diaphragms Difficult to stabilize and can lead to a significant decrease in the breathability of the diaphragm
Although it has been reported that water-based polymer coated diaphragms can avoid the above various problems of oily polymer coating, when the average particle size of water-based polymer microspheres is greater than 5 microns, it is difficult to prepare a stable slurry. Not easy to store, causing inconvenience to diaphragm coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, 0.48% of the total weight of block anionic polyurethane is added to the water-based polymer coating slurry as a dispersant, and the polymer microspheres use polyvinylidene fluoride-hexafluoropropylene copolymer particles with a particle size D50 of 7 μm , Block anionic polyurethane is specifically polyacrylic acid-b-polyurethane, wherein the hydrophobic polyurethane segment is polyurethane polymerized from hexamethylene diisocyanate and polyethylene oxide glycol.

[0036] The specific preparation of the aqueous polymer coating slurry of this example is as follows:

[0037] Weigh 14.56g polyvinylidene fluoride-hexafluoropropylene copolymer particles, 0.8g water-based polyacrylic acid latex, 0.48g block anionic polyurethane, 0.16g wetting agent polyvinyl alcohol, disperse in 84g deionized water, 100r / min, and stirred for 600 min to obtain the water-based polymer coating slurry of this example.

[0038] As a comparison, in this example, the common disper...

Embodiment 2

[0042] This example adopts different block anionic polyurethane equivalents to replace the block anionic polyurethane of embodiment 1, specifically as follows:

[0043] Test 1: The block anionic polyurethane used is specifically polyacrylic acid-b-polyurethane, wherein the polyurethane segment is a polyurethane polymerized from hexamethylene diisocyanate and polyethylene oxide glycol.

[0044] Test 2: The block anionic polyurethane used is specifically sodium polymethacrylate-b-polyurethane, wherein the polyurethane segment is a polyurethane polymerized from polyoxypropylene diol and isophorone diisocyanate.

[0045] According to the block anionic polyurethane tested above, the same formula and method as in Example 1 were used to prepare water-based polymer coating slurries using different block anionic polyurethanes, labeled as water-based polymer coating slurries 1 and 2. And according to the same method as in Example 1, let it stand at room temperature for seven days, and o...

Embodiment 3

[0047] In this example, on the basis of Example 1, the particle size D50 of polyvinylidene fluoride-hexafluoropropylene copolymer particles was tested, that is, this example purchased polyvinylidene fluoride-hexafluoropropylene copolymer particles with different particle sizes D50 granules for the preparation of waterborne polymer coating slurries. All the other are identical with embodiment 1, detail is as follows:

[0048] Test 1: Polyvinylidene fluoride-hexafluoropropylene copolymer particles with a D50 of 0.1 μm were used.

[0049] Test 2: Polyvinylidene fluoride-hexafluoropropylene copolymer particles with a D50 of 1 μm were used.

[0050] Test 3: Polyvinylidene fluoride-hexafluoropropylene copolymer particles with a D50 of 2 μm were used.

[0051] Test 4: Polyvinylidene fluoride-hexafluoropropylene copolymer particles with a D50 of 5 μm were used.

[0052] Test 5: Polyvinylidene fluoride-hexafluoropropylene copolymer particles with a D50 of 8 μm were used.

[0053] T...

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Abstract

The application discloses a water-based polymer coating slurry and its application. The water-based polymer coating slurry of the present application, wherein block anionic polyurethane is added as a dispersant, the block anionic polyurethane is composed of hydrophobic polyurethane segment and hydrophilic anionic polymer segment; hydrophobic polyurethane segment Adsorbed on the polymer microspheres, the hydrophilic anionic polymer chain segments are stretched in the water, so that the polymer microspheres are stably suspended in the water. The water-based polymer coating slurry of the present application can make polymer microspheres better by utilizing the adsorption of block anionic polyurethane to polymer microspheres and the dispersibility of hydrophilic anionic polymer segments in water. Suspended in water to improve the stability of water-based polymer coating slurry; on the one hand, it can reduce the long-term storage and settlement of water-based polymer coating slurry; on the other hand, it can be used in water-based polymer coating slurry Large particle size polymer microspheres to meet different application requirements.

Description

technical field [0001] The application relates to the field of battery separators, in particular to a water-based polymer coating slurry and its application. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, they have been widely used as power sources for various mobile devices due to their high energy density, high operating voltage, no memory effect, and long cycle life. With the large-scale application of lithium-ion batteries, their safety issues have become increasingly prominent. [0003] The main function of the diaphragm in the lithium-ion battery is to separate the positive and negative electrodes of the battery and prevent short circuit caused by contact between the two electrodes. It is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/16C09D133/04C09D175/08C09D7/65H01M50/414H01M50/417H01M50/426H01M50/443H01M50/449H01M10/0525H01M50/411
CPCC09D127/16C09D7/65H01M10/0525C08L2205/035C08L2203/20H01M50/411C08L33/04C08L75/08C08L29/04Y02E60/10
Inventor 刘琳姚坤倪靖周超王会娜
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD