Unlock instant, AI-driven research and patent intelligence for your innovation.

Water-based curtain casting slurry for NFC (near field communication) magnetic substrate, preparation method of slurry and NFC magnetic substrate

A water-based, casting slurry technology for substrates, applied in the field of near-field communication, can solve the problems of difficult slurry degassing, harsh production conditions, long drying time, etc., achieve easy defoaming of slurry, reduce production costs, Reduce the effect of the pressing process

Active Publication Date: 2014-12-03
成都佳驰电子科技股份有限公司
View PDF3 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high organic content leads to low density of the diaphragm, poor production conditions, and great harm to the human body and the environment
At the same time, its solvents are flammable, and there are great safety hazards in the production process, and the production cost is high. Therefore, it has become an irreversible trend to study water-based tape casting technology characterized by safe, clean and low-cost production.
[0005] The water-based tape casting process uses water as a solvent instead of organic solvents, and most of the current research is in the experimental stage
However, since water molecules are polar molecules and have high surface tension, dispersants, binders, plasticizers, and additives are organic additives, and there are compatibility problems with water molecules.
Therefore, the wettability of water to powder in water-based tape casting is poor, slow volatilization and long drying time, difficult defoaming of slurry, poor flexibility of cast film, easy cracking, low strength and other defects

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Water-based curtain casting slurry for NFC (near field communication) magnetic substrate, preparation method of slurry and NFC magnetic substrate
  • Water-based curtain casting slurry for NFC (near field communication) magnetic substrate, preparation method of slurry and NFC magnetic substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: An NFC magnetic substrate prepared by the following method:

[0031] S1. Raw material preparation: Weigh each raw material according to the following ratio and set aside; nano-scale ferrite powder (particle size: 300-500nm): 40kg; polyacrylic acid: 0.1kg; polyvinyl alcohol: 0.5kg; polyethylene glycol : 0.3kg; polyether defoamer: 0.3kg; water: 8kg;

[0032] S2. Prepare casting slurry: Mix the nano-scale ferrite powder, polyacrylic acid, polyvinyl alcohol, polyethylene glycol, and water weighed in step S1, and then ball mill for 20 hours. The ball milling speed is 300r / min. Obtain cast slurry;

[0033] S3. Defoaming stale: Pass the casting slurry prepared in step S2 through a 100-mesh sieve, add polyether defoamer, and perform vacuum defoaming for 8 hours under a negative pressure environment of 0.1MPa, and perform stale treatment at 1h / L , control the viscosity at 10000cps, and prepare the NFC magnetic substrate water-based casting slurry;

[0034] S4. T...

Embodiment 2

[0036] Embodiment 2: An NFC magnetic substrate prepared by the following method:

[0037] S1. Raw material preparation: Weigh each raw material according to the following ratio and set aside; nano-scale ferrite powder (particle size: 300-500nm): 81kg; polyacrylic acid: 0.5kg; polyvinyl alcohol: 1.5kg; polyethylene glycol : 1.0kg; polyether defoamer: 1.0kg; water: 15kg;

[0038] S2. Prepare casting slurry: mix the nano-scale ferrite powder, polyacrylic acid, polyvinyl alcohol, polyethylene glycol, and water weighed in step S1, and then ball mill for 30 hours. The ball milling speed is 500r / min. Obtain cast slurry;

[0039] S3. Defoaming stale: Pass the casting slurry prepared in step S2 through a 200-mesh sieve, add polyether defoamer, perform vacuum defoaming for 15 hours under a negative pressure environment of 0.3MPa, and perform stale treatment at 2h / L , the viscosity is controlled at 15000cps, and the NFC magnetic substrate water-based casting slurry is prepared;

[0040]...

Embodiment 3

[0042] Embodiment 3: An NFC magnetic substrate prepared by the following method:

[0043] S1. Raw material preparation: Weigh each raw material according to the following proportions and set aside; nano-scale ferrite powder (particle size: 300-500nm): 55kg; polyacrylic acid: 0.2kg; polyvinyl alcohol: 1kg; polyethylene glycol: 0.5kg; polyether defoamer: 0.5kg; water: 10kg;

[0044] S2. Prepare casting slurry: Mix the nano-scale ferrite powder, polyacrylic acid, polyvinyl alcohol, polyethylene glycol, and water weighed in step S1, and then ball mill for 24 hours. The ball milling speed is 365r / min. Obtain cast slurry;

[0045] S3. Defoaming and aging: Pass the casting slurry prepared in step S2 through a 130-mesh sieve, add polyether defoaming agent, and perform vacuum defoaming for 10 hours under a negative pressure environment of 0.2MPa, and perform aging at 1.4h / L Treatment, control the viscosity at 12000cps, and make the NFC magnetic substrate water-based casting slurry; ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a water-based curtain casting slurry for an NFC (near field communication) magnetic substrate, a preparation method of the slurry and an NFC magnetic substrate, and belongs to the field of near field communication. The water-based curtain casting slurry for the NFC magnetic substrate is prepared from the following raw materials in parts by weight: 25-40 parts of nanoscale ferrite powder, 0.1-0.5 part of polyacrylic acid, 0.5-1.5 parts of polyvinyl alcohol, 0.3-1.0 part of polyethylene glycol, 0.3-1.0 part of polyether defoamer and 8-15 parts of water. The preparation method for the slurry comprises the following steps: preparing materials, preparing a curtain casting slurry, defoaming and aging. A preparation method for the NFC magnetic substrate comprises the following steps: curtain casting and forming, and cutting. The slurry solvent for the NFC magnetic substrate is good in wettability on powder, has the advantages of quickness in volatilization, short drying time, easiness in slurry defoaming, good flexibility of curtain casting film, difficulty in cracking and high strength. The preparation method for the slurry has the characteristics of convenience in preparation, safety, environmental friendliness, high efficiency and low cost; and the magnetic substrate prepared by the slurry has a uniform structure, high strength and good flexibility.

Description

technical field [0001] The invention belongs to the field of near field communication (NFC, near field communication), and in particular relates to a water-based casting slurry for an NFC magnetic substrate, a preparation method thereof, and an NFC magnetic substrate. Background technique [0002] Near field communication (NFC, near field communication) is a wireless technology initiated by Philips and jointly promoted by famous manufacturers such as Nokia and Sony. It was originally just a combination of remote control identification and network technology, but now it has developed into an easy , safe and rapid communication wireless connection technology plays a huge role in access control, public transportation, mobile payment and other fields. [0003] The NFC magnetic substrate is an important component for the NFC antenna to work properly in a metal environment. Due to the miniaturization and integration requirements of modern electronic equipment, the thickness of th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B35/26C04B35/634C04B35/622
Inventor 邓龙江谢海岩谢建良梁迪飞陈良张宏亮阙智勇
Owner 成都佳驰电子科技股份有限公司