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Electromagnetic shielding material and preparation method thereof

A technology of electromagnetic shielding materials and antioxidants, applied in the field of conductive plastics, can solve the problems of high volume resistivity and low impact strength, achieve excellent electrical conductivity, good flame retardancy, and improve the effect of electromagnetic shielding

Inactive Publication Date: 2016-04-13
CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides an electromagnetic shielding material aiming at the technical problems of electromagnetic shielding effectiveness, tensile strength, elongation at break, low impact strength and high volume resistivity in existing electromagnetic shielding materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Weigh according to the ratio of parts by mass: 100 parts of LDPE; 25 parts of nickel powder; 10 parts of carbon black; 4 parts of polyethylene wax; 15 parts of AC; 2 parts of stearic acid; 30 parts of polyisobutylene; 4 parts of aluminum hydroxide ; 40 parts of CPE; 30 parts of EVA; 8 parts of sorbitan laurate; 0.02 parts of DCP; 3 parts of decabromodiphenyl ether; 50 parts of antioxidant DLTP; Bromocyclododecane 10 parts.

[0024] The second step: first preheat the carbon black to 70°C, and use a coupling agent for surface treatment for 40 minutes;

[0025] The third step: Add polyisobutylene, AC, EVA and hexabromocyclododecane, stir at 50°C for 30min, then add sorbitan laurate, DCP and decabromodiphenyl ether, at 60°C, rotate at 80r Under the condition of / min, stir for 30min;

[0026] Step 4: Raise the temperature to 80°C, add the remaining raw materials, mix for 100 minutes, and then put it into a twin-screw extruder. The extrusion temperature is 130°C, 14...

Embodiment 2

[0029] Step 1: Weigh according to the ratio of parts by mass: 100 parts of LDPE; 45 parts of nickel powder; 50 parts of carbon black; 8 parts of polyethylene wax; 35 parts of AC; 6 parts of stearic acid; 50 parts of polyisobutylene; 8 parts of aluminum hydroxide ; 80 parts of CPE; 70 parts of EVA; 12 parts of sorbitan laurate; 0.08 parts of DCP; 7 parts of decabromodiphenyl ether; Bromocyclododecane 30 parts.

[0030] The second step: first preheat the carbon black to 90°C, and use a coupling agent for surface treatment for 60 minutes;

[0031] The third step: Add polyisobutylene, AC, EVA and hexabromocyclododecane, stir at 70°C for 50min, then add sorbitan laurate, DCP and decabromodiphenyl ether, at 80°C, rotate at 100r Under the condition of / min, stir for 50min;

[0032] Step 4: Raise the temperature to 100°C, add the remaining raw materials, mix for 120 minutes, and then put it into a twin-screw extruder, the extrusion temperature is 140°C, 150°C, 160°C, 170°C, and the ...

Embodiment 3

[0035] Step 1: Weigh according to the ratio of parts by mass: 100 parts of LDPE; 30 parts of nickel powder; 20 parts of carbon black; 5 parts of polyethylene wax; 20 parts of AC; 3 parts of stearic acid; 35 parts of polyisobutylene; 50 parts of CPE; 40 parts of EVA; 9 parts of sorbitan laurate; 0.04 parts of DCP; 4 parts of decabromodiphenyl ether; 55 parts of antioxidant DLTP; 15 parts of cyclododecane.

[0036] The second step: first preheat the carbon black to 70°C, and use a coupling agent for surface treatment for 40 minutes;

[0037] The third step: Add polyisobutylene, AC, EVA and hexabromocyclododecane, stir at 50°C for 30min, then add sorbitan laurate, DCP and decabromodiphenyl ether, at 60°C, rotate at 80r Under the condition of / min, stir for 30min;

[0038] Step 4: Raise the temperature to 80°C, add the remaining raw materials, mix for 100 minutes, and then put it into a twin-screw extruder. The extrusion temperature is 130°C, 140°C, 150°C, 160°C, and the screw s...

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Abstract

The invention discloses an electromagnetic shielding material and a preparation method thereof. The electromagnetic shielding material comprises, by weight, 100 parts of LDPE, 25-45 parts of nickel powder, 10-50 parts of carbon black, 4-8 parts of polyethylene wax, 15-35 parts of AC, 2-6 parts of stearic acid, 30-50 parts of polyisobutylene, 4-8 parts of a fire retardant, 40-80 parts of CPE, 30-70 parts of EVA, 8-12 parts of sorbitan monolaurate, 0.02-0.08 parts of DCP, 3-7 parts of decabromodiphenyl ether, 50-70 parts of an antioxidant, 0.1-2 parts of a coupling agent and 10-30 parts of hexabromocyclododecane. The electromagnetic shielding effectiveness of the material is 40-80db; the material has the characteristics of good fire resistance, self-extinguishing after being deviated from fire, and no droplets; the volume resistivity is 5-9omega.cm, and the tensile strength is 20-40MPa; and the elongation at break is 300-500%, and the impact strength is 15-35kJ / m<2>.

Description

technical field [0001] The invention relates to the field of conductive plastics, in particular to an electromagnetic shielding material and a preparation method thereof. Background technique [0002] Conductive composite materials currently mainly refer to composite conductive polymer materials, which are composed of polymers and various conductive substances in a certain way. In the process of processing and using ordinary polymer materials, the electrostatic phenomenon is very serious. In some cases, it will not only affect the performance of the material, but even cause harm, such as reducing the electrostatic dust of plastic packaging materials and reducing the quality of products. Value; various plastic products and electronic products used in flammable and explosive environments, spark explosion and combustion caused by static electricity. All of these should use conductive composite materials to improve the electrostatic capacity of the material. [0003] Due to th...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08L23/28C08L23/20C08K13/06C08K9/06C08K3/04C08K5/09C08K3/08C08K3/22
CPCC08L23/06C08L2201/02C08L2205/035C08L23/286C08L23/20C08L23/0853C08K13/06C08K9/06C08K3/04C08K5/09C08K2003/0862C08K2003/2227
Inventor 张宇金健
Owner CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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