Radar wave-absorbing explosion-proof polyurea material and preparation method thereof
A technology of polyurea and radar, which is applied in the field of radar wave-absorbing and explosion-proof polyurea materials and its preparation, can solve the problems of poor matching of magnetic permeability and permittivity, large reflectivity, and large wave impedance difference, etc., and achieve high construction efficiency, The effect of high solid content and excellent electromagnetic properties
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[0050] The present invention also provides a method for preparing the above-mentioned radar absorbing explosion-proof polyurea material, comprising the following steps:
[0051] (1) Preparation of component A: prepare raw materials according to the formula, add diisocyanate into a four-neck flask, heat up to 50°C-60°C; keep stirring and add polyol, heat up to 85°C-95°C after adding, keep warm 1.5h~2.5h, after the titration value of -NCO content reaches the theoretical value, stop heating and cool down to room temperature, then discharge the material for later use;
[0052] (2) Preparation of component B: Prepare raw materials according to the formula, add polyol, amino-terminated chain extender, silane coupling agent, nano-ferrite, nickel-coated graphene, and additives into the dispersion container in sequence, and keep the rotation speed Disperse for 20-40 minutes, then stop stirring;
[0053] (3) Use the spraying equipment to prepare the radar absorbing explosion-proof poly...
Embodiment 1
[0055] A radar absorbing explosion-proof polyurea material, the preparation process is as follows:
[0056] (1) Preparation of component A
[0057] According to parts by weight, add 473 parts of isophorone diisocyanate (IPDI) into the four-necked flask, start heating and stirring, raise the temperature to 50 ° C ~ 60 ° C, and add 527 parts of polytetrahydrofuran polyol (PTMG-2000) Slowly added dropwise to a four-neck flask. After the dropwise addition is completed, control the reaction temperature to 85°C-95°C for 1.5h-2.5h. After taking a sample to determine that the NCO content reaches 15.7% ± 0.3%, it can be cooled to room temperature and discharged to obtain the required A-component prepolymer.
[0058] (2) Preparation of component B
[0059] In parts by weight, add 223 parts of 3,5 diethyltoluenediamine (E100) and 609 parts of polytetrahydrofuran polyol (PTMG-1000) into the dispersion container, start stirring, and add 7 parts of N-(β-ammonia Ethyl)-γ-aminopropyltriet...
Embodiment 2
[0062] A radar absorbing explosion-proof polyurea material, the preparation process is as follows:
[0063] (1) Preparation of component A
[0064] Add 456 parts of toluene diisocyanate (TDI) into the four-necked flask, turn on heating and stirring, raise the temperature to 50°C~60°C, and slowly drop 544 parts of polycaprolactone polyol (PCL-1000) into the four-necked flask in the flask. After the dropwise addition is completed, control the reaction temperature to 85°C-95°C for 1.5h-2.5h. After taking a sample to determine that the NCO content reaches 17.4%±0.3%, it can be cooled to room temperature and discharged to obtain the required A-component prepolymer.
[0065] (2) Preparation of component B
[0066] Add 261 parts of 3,5-diethyltoluenediamine (E100), 115 parts of 3,5-dimethylthiotoluenediamine (E-300), and 441 parts of polycaprolactone polyol (PCL-2000), add Into the dispersion container, start stirring, add 8 parts of γ-aminopropyltriethoxysilane, 40 parts of nano...
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