X/gamma ray shielding composite material based on polyvinyl alcohol through-hole foam and preparation method of X/gamma ray shielding composite material
A polyvinyl alcohol and composite material technology, applied in shielding, reactor, nuclear engineering and other directions, can solve the problems of low shielding efficiency, suffocation, limited addition of shielding materials, etc., to improve compatibility and reinforcement, and improve flexibility. , the effect of good air permeability
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Embodiment 1
[0030] Add 30 parts by weight of polyvinyl alcohol 1788 (Anhui Wanwei High-tech Materials Co., Ltd.) into 250 parts by weight of water, stir and dissolve at 90-95°C, add 100 parts by weight of bismuth powder, stir evenly, and slowly cool down to 72°C. Then add 15 parts by weight of potato starch (99%, Guyuan Xueguan Starch Co., Ltd.), stir evenly; cool down to 52-54 ° C, add 8 parts by weight of formaldehyde solution for acetalization; add 5 parts by weight of hydrochloric acid, mix and stir Evenly; then pour into the mold and dry at 65°C for 7-8 hours; after demoulding, wash with water to remove residual potato starch, hydrochloric acid, and formaldehyde in the matrix until the water is neutral, and dry to obtain a breathable radiation shielding composite material .
[0031]Thus obtain a polyvinyl alcohol-based breathable foam material with a thickness of 1mm and a square meter weight of 1.8kg / m 2 . For X-rays with a tube voltage of 120KV (average energy 100KeV), it can shi...
Embodiment 2
[0033] 1) Put 100 parts by weight of bismuth trioxide / tantalum powder (mass ratio 1:2) into a high-speed mixer, stir and dry, the temperature of the material reaches 100-110°C, and the drying time is 10-15min, so that the bismuth trioxide / The moisture content of tantalum powder is lower than 0.3%, slowly add 10 parts by weight of isopropanol solution of titanate coupling agent (isopropanol / titanate coupling agent=1:10), stir and control the temperature at 105 ℃, modification time 3-5min;
[0034] 2) Dissolve 15 parts by weight of sodium hydroxymethylcellulose (99%, Shanghai Changguang Enterprise Development Co., Ltd.) in 50 parts by weight of water, stir evenly, form a paste, and set aside;
[0035] 3) Add 40 parts by weight of polyvinyl alcohol 1788 (Anhui Wanwei High-tech Materials Co., Ltd.) / glycerin (mass ratio 1:1) to 200 parts by weight of water, stir and dissolve at 95°C, add 100 parts by weight of modified Bismuth trioxide / tantalum powder, stir evenly, slowly cool do...
Embodiment 3
[0038] 1) Put 100 parts by weight of tungsten carbide / tungsten powder (mass ratio 2:1) into a high-speed mixer, stir and dry, the temperature of the material reaches 100-110°C, and the drying time is 10-15min, so that the moisture content of tungsten carbide is lower than 0.3%, slowly add 10 parts by weight of silane coupling agent (KH-550) in isopropanol solution (isopropanol / silane coupling agent = 1:10), stir, control temperature 105°C, modification time 3 -5min;
[0039] 2) Dissolve 12 parts by weight of hydroxypropyl methylcellulose (CA-F01, 98%, Guangzhou Duomeiduo New Material Co., Ltd.) in 50 parts by weight of water, stir evenly, form a paste, and set aside;
[0040] 3) Add 50 parts by weight of polyvinyl alcohol 1799 (Anhui Wanwei High-tech Materials Co., Ltd.) / xylitol (mass ratio 3:2) to 200 parts by weight of water, stir and dissolve at 95°C, add 100 parts by weight of modified Stir the final tungsten carbide / tungsten powder evenly, slowly cool down to 72°C, then ...
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