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Halogen-free flame-retardant electromagnetic shielding material and preparation method and application thereof

A technology of electromagnetic shielding materials and flame retardants, which is applied in the fields of magnetic/electric field shielding, electrical components, fireproof coatings, etc. It can solve problems such as non-conductivity of the bonding surface, reflection loss on the surface of the shielding body, and difficulty in meeting the latest requirements. Achieve high electromagnetic shielding efficiency, optimization of electromagnetic shielding, optimization of mechanical properties and other properties

Active Publication Date: 2018-05-08
HANGZHOU XIANGJUN TEXTILE FLAME RETARDANT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) Reflection loss caused by impedance mismatch on the surface of the shield;
[0009] (2) When the electromagnetic wave is transmitted inside the shielding material, the electromagnetic energy is absorbed to cause transmission loss or absorption loss;
[0010] (3) Energy loss caused by multiple reflections of electromagnetic waves between the inner walls of the shielding material
After the hot melt adhesive is attached to the conductive cloth, the thickness and quality are high, and then the thermal or conductive adhesive will be greatly restricted.
And the hot melt adhesive film lamination process is adopted, the lamination surface does not have electrical conductivity, the resistance is too high, and it is difficult to meet the latest requirements of the market

Method used

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  • Halogen-free flame-retardant electromagnetic shielding material and preparation method and application thereof
  • Halogen-free flame-retardant electromagnetic shielding material and preparation method and application thereof
  • Halogen-free flame-retardant electromagnetic shielding material and preparation method and application thereof

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preparation example Construction

[0067] Taking the preparation, deblocking and crosslinking of phosphorus-containing blocked isocyanate as an example, the reaction formula in the typical application of the present invention can be seen from the following reaction formula schematic diagram as follows:

[0068]

[0069] Among them, HOR 3 OH is polyether polyol (for example, polyether polyol such as N210 / N220).

[0070] The typical crosslinking reaction formula is as follows (take the deblocking and crosslinking of phosphorus-containing blocked isocyanate as an example):

[0071]

[0072] It can be seen from the above reaction formula that the flame-retardant crosslinking agent and flame-retardant polymer adhesive through the chemical reaction and the combination of the polymer chain, so that various flame-retardant raw materials and conductive materials are firmly bonded to the substrate, thereby achieving good Application performance.

[0073] The halogen-free flame-retardant electromagnetic shielding material of the ...

Embodiment 1

[0076] In a stirring vessel, add 10 grams of non-ionic wetting agent W-18 (Hemmings Deqian (Shanghai) Chemical Co., Ltd.), and 10 grams of polycarboxylate sodium salt anionic dispersant SN5040 (Weifang Dadong Chemical Co., Ltd.) ) Disperse in 500 grams of water-based flame-retardant polyurethane TF-686 (Zhejiang Chuanhua Co., Ltd. TF-686, solid content 40%), the stirring speed is 300RPM;

[0077] Under the condition of stirring and dispersing, add 150 grams of conductive nickel powder, 300 grams of type II ammonium polyphosphate with a degree of polymerization greater than 1000, add 400 grams of water, and continue to disperse at 600 RPM;

[0078] Under the condition of stirring and dispersing, add 5 grams of K3 defoamer (mineral oil defoamer), 20 grams of flame retardant crosslinking agent polycarbodiimide, and 150 grams of liquid flame retardant resorcinol phosphate (RDP ), 100 grams of flame retardant synergist melamine borate (Sichuan Zhuoan New Material Technology Co., Ltd.), ...

Embodiment 2

[0082] Weigh 956 grams of phosphorus-containing polyester diol DM1304 (Beijing Demei Kechuang Technology Co., Ltd. DM1304, molecular weight 478, hydroxyl value 233mgKOH / g, phosphorus content (wt, %) 19.7%), 134 grams of dimethylol propylene Acid and 400 grams of polyether polyol N210 (Nanjing Zhongshan Chemical Co., Ltd.), drop 870 grams of toluene diisocyanate (Yantai Wanhua Chemical Group Co., Ltd.) for polycondensation reaction, control the molar ratio of NCO / OH in the material at 1.5 :1, add 100 grams of butanone and react at 78°C for 2.0 hours;

[0083] Use 298.3 grams of methyl ethyl ketoxime (Zhejiang Quzhou New Future Chemical Co., Ltd.) to cap the residual NCO of the end group, and react at 70°C for 1.0 hour;

[0084] Use 101 grams of triethylamine for neutralization, the molar ratio of triethylamine to dimethylolpropionic acid is 1:1, and the degree of neutralization is controlled at 100%;

[0085] Add 5713 grams of deionized water, emulsify at a high speed at 1400 RPM, af...

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Abstract

The invention discloses a halogen-free flame-retardant electromagnetic shielding material. The halogen-free flame-retardant electromagnetic shielding material comprises an electricity conducting powder material, a halogen-free flame retardant powder material, a liquid flame retardant, a flame-retardant synergist, a reaction type phosphorus-containing flame retardant containing active groups, a charring agent, a wetting agent, a dispersing agent and a thickening agent. When all the compositions are baked at a high temperature, a whole is formed through adhesion and crosslinking of a flame-retardant polymer binder and a flame-retardant cross-linking agent, and an excellent flame-retardant effect and an electromagnetic shielding function are achieved. When the application is achieved in a coating mode, the flame-retardant polymer binder and the flame-retardant cross-linking agent are bonded and crosslinked with the reaction type phosphorus-containing flame retardant containing the activegroups and the charring agent under the action of high-temperature baking, various flame-retardant compositions and the electricity conducting powder material are bonded with a substrate, the bondingstrength between the coating and the substrate is very high, an excellent in-situ charring capacity is achieved, the flame-retardant performance of a condensed phase is excellent, and the halogen-freeflame-retardant electromagnetic shielding material has good electromagnetic shielding performance.

Description

Technical field [0001] The invention relates to a flame-retardant electromagnetic shielding material, in particular to a halogen-free flame-retardant electromagnetic shielding material and a preparation method and application thereof. Background technique [0002] With the rapid development of science and technology and the electronics industry, various digital and high-frequency electronic and electrical equipment radiate a large number of electromagnetic waves of different wavelengths and frequencies to the space when working, resulting in a new environmental pollution-electromagnetic interference (Electromagnetic Interference, EMI) and radio frequency or radio interference (Radio Frequency Interference, RFI). [0003] At the same time, electronic components are also developing in the direction of miniaturization, light weight, digitization and high-density integration. The sensitivity is getting higher and higher, and they are susceptible to misoperation, image barriers, and sou...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/18C09D7/62C09D7/61C09D7/65H05K9/00C08G18/66C08G18/46C08G18/34C08G18/48
CPCC08G18/348C08G18/4018C08G18/4684C08G18/48C08G18/6625C08K5/053C08K5/34928C08K5/42C08K5/523C08K5/5313C08K9/10C08K13/06C08K2003/026C08K2003/0806C08K2003/085C08K2003/0862C08K2003/323C08K2003/387C08L2201/02C08L2201/22C08L2203/20C08L2205/02C08L2205/025C08L2205/035C09D5/18C09D175/04H05K9/0081C08L33/02C08L79/02C08L75/04C08K13/02C08K3/08C08K3/32C08L83/04C08L53/00C08L75/06C08L75/08C08K5/521C08K3/02C08K3/38C08K7/24
Inventor 曾军蒋小云蒋义赏陈忠刚刘清华唐俊毅
Owner HANGZHOU XIANGJUN TEXTILE FLAME RETARDANT TECH
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