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Acrylic Mirror Sheet: Silver Sprayed on Acrylic Treated with Tannin in Water and Isopropanol
Philips' Ponjee and Verwijlen (US 4,639,382, 1987) made silver hold on acrylic by first dipping it in tannin dissolved in water mixed with an organic solvent; tannin in plain water gave no bond. This is their isopropanol solution: 50–85 % water, 15–50 % isopropanol by volume, 3.0–5.0 g tannin per litre, which gave full bonding in their cross-cut test. The sheet is then sensitised with weak stannous chloride and silvered by spraying the silver solution and the reducer together.
The picture: our diagram.
中级
2 hours
说明
1
1
Dip in tannin solution for one minute
Dip in tannin solution for one minute
Make a solution of 3.0–5.0 g of tannic acid per litre in 50–85 % water and 15–50 % isopropanol by volume. Dip the acrylic sheet in it for one minute.
此步骤所需材料：
亚克力板1 个所需工具：
单宁酸
异丙醇（溶剂）
蒸馏水
玻璃托盘
量筒
等臂天平
通风柜（带排风管）
橡胶手套2
2
Rinse with water
Rinse with water
Rinse the sheet with water.
所需工具：
蒸馏水
实验室洗瓶3
3
Spray with stannous chloride for 12 seconds
Spray with stannous chloride for 12 seconds
Spray the face to be silvered with a solution of 0.1 g stannous chloride and 0.1 ml concentrated hydrochloric acid per litre of water, for 12 seconds. Rinse off the excess with water.
所需工具：
氯化亚锡
盐酸蒸馏水
喷水壶实验室洗瓶
化学防溅护目镜橡胶手套4
4
Spray silver and reducer together
Spray silver and reducer together
Atomise two solutions onto the face at the same time: silver nitrate with ammonia in water, and formalin in water. The patent gives no strengths: as required. Ours: a twin-nozzle spray gun.
此步骤所需材料：
硝酸银1 as required所需工具：
氨水 25-28 %
甲醛溶液（37 % 福尔马林）蒸馏水
双喷嘴喷枪通风柜（带排风管）化学防溅护目镜橡胶手套此蓝图制作
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