Microporous wave-absorbing material with low surface density and high tensile strength and preparation method

A technology of high tensile strength and wave-absorbing materials, applied in the field of wave-absorbing materials, can solve the problems of low mechanical properties, high surface density of wave-absorbing materials, poor temperature resistance, etc., and achieve increased mechanical properties and uniform cell distribution , the effect of excellent absorbing performance

Active Publication Date: 2014-02-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low surface density and high tensile strength wave absorbing material and its preparation method in order to solve the problems of high surface density, low mechanical properties and poor temperature resistance of existing wave absorbing materials

Method used

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  • Microporous wave-absorbing material with low surface density and high tensile strength and preparation method
  • Microporous wave-absorbing material with low surface density and high tensile strength and preparation method
  • Microporous wave-absorbing material with low surface density and high tensile strength and preparation method

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preparation example Construction

[0026] The preparation method of the microporous wave-absorbing material with low surface density and high tensile strength comprises the following steps:

[0027] (1) Physically stir rubber, zinc oxide, stearic acid, anti-aging agent, flow aid, sulfur, accelerator, foaming agent, plasticizer and absorbent, and then add them to the internal mixer and mix them uniformly. get the mixture;

[0028] The mass ratio of described rubber, zinc oxide, stearic acid, antioxidant, flow aid, sulfur, promotor, blowing agent and plasticizer is 100:5:2:2:1.5:2:1:(5 -18): (15-25), the blowing agent is azodicarbonamide, modified azodicarbonamide or N,N'-dimethylpentamethylenetetramine, and the absorbent is Micron-sized conductive carbon black, its quality is 30-40% of the total mass of rubber, zinc oxide, stearic acid, antioxidant, flow aid, sulfur, accelerator, blowing agent and plasticizer, preferably 5-18% % (according to the well-known in the field, the default blowing agent has no residu...

Embodiment 1

[0039] 100g nitrile rubber 220, 5g zinc oxide, 2g stearic acid, 2gN,N-nickel dibutyldithiocarbamate, 1.5g granular fatty acid, 2g sulfur, 1gN-cyclohexyl-2-benzothiazolium Sulfonamide, 5g of azodicarbonamide, 15g of dibutyl phthalate and 40.5g of micron-sized conductive carbon black are added to the internal mixer and mixed evenly within 85°C to obtain a mixture; the mixture obtained by banburying is moved to Open the mill to get a uniform and stable raw material, then cut 62.0g of raw material into a suitable size and put it into 200×200 2In the mold of mm, the height of the mold cavity is 1.2mm, and the microporous wave-absorbing material is obtained by vulcanizing and foaming in a flat vulcanizing machine at 150°C for 25 minutes. The mechanical properties of the material are shown in Table 1.

Embodiment 2

[0041] 100g nitrile rubber 220, 5g zinc oxide, 2g stearic acid, 2g2,2,4-trimethyl-1,2-dihydroquinoline polymer, 1.5g granular fatty acid derivative ZC-56, 2g sulfur , 1g2-mercaptobenzothiazole, 10g modified azodicarbonamide, 20g dioctyl phthalate and 50.225g micron-sized conductive carbon black are added in the internal mixer and mixed evenly to obtain the mixture; The mixture obtained by refining is moved to an open mill to obtain a uniform and stable raw material, and then 65.0g of raw material is cut into a suitable size and put into a 200×200 2 In the mold of mm, the height of the mold cavity is 1.5mm, and the microporous wave-absorbing material is obtained by vulcanizing and foaming in a flat vulcanizing machine at 155°C for 30 minutes. The mechanical properties of the material are shown in Table 1.

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Abstract

The invention discloses a microporous wave-absorbing material with low surface density and high tensile strength and a preparation method and belongs to the technical field of wave-absorbing material. According to the invention, problems of high density, low mechanical properties and poor temperature resistance of a present microwave material are solved. The preparation method comprises steps of: uniformly stirring rubber, zinc oxide, eleaostearic acid, an anti-aging agent, a flow promoter, sulphur, a promoter, a foaming agent, a plasticiser and an absorbent, banburying, open-milling, vulcanizing at 150-160 DEG C and simultaneously foaming for 25-35min so as to obtain the microporous wave-absorbing material. The total thickness of the prepared microporous wave-absorbing material is between 1.4mm and 2.0mm, and its surface density is less than 1.7kg/m<2>. The material has good wave-absorbing performance at specific wavelengths. Meanwhile, the material has good temperature resistance and mechanical property. The temperature that the material resists can reach 150 DEG C. Average value of tensile strength is greater than 8.5MPa, and the minimum elongation at break is 360%.

Description

technical field [0001] The invention relates to a microporous wave-absorbing material with low surface density and high tensile strength and a preparation method thereof, belonging to the technical field of wave-absorbing materials. Background technique [0002] In the prior art, the patch-type wave-absorbing material is generally formed by mixing and rolling an adhesive and an absorbing agent (usually a magnetic material). By selecting different substrates and optimizing the formula design, the performance of the absorbing material can meet different needs. This kind of patch-type material absorbs waves with good uniformity, strong process controllability, stable material properties (especially electrical properties), and simple construction technology. [0003] However, the existing patch-type absorbing materials generally have the disadvantage of high surface density, and the surface density of the wave-absorbing sheet with a thickness of less than 1mm has mostly exceede...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08L15/00C09K3/00C08K13/02C08K3/22C08K5/09C08K3/06C08J9/10B29C44/00B29B7/00
Inventor 孙洪国周金向杨小牛
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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