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Acrylic Mirror Sheet: Silver Sprayed on Acrylic Treated with Tannin in Water and Acetic acid
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 acetic acid solution: 55–90 % water, 19–45 % acetic acid by volume, 3.3–5.5 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.
Menengah
2 hours
Instruksi
1
1
Dip in tannin solution for one minute
Dip in tannin solution for one minute
Make a solution of 3.3–5.5 g of tannic acid per litre in 55–90 % water and 19–45 % acetic acid by volume. Dip the acrylic sheet in it for one minute.
Material untuk langkah ini:
Lembaran Akrilik1 buahAlat yang dibutuhkan:
Asam Tanat
Asam asetat (glasial)
Air Suling
Baki kaca
Gelas ukur
Neraca lengan
Lemari asam (bersaluran buang)
Sarung tangan karet2
2
Rinse with water
Rinse with water
Rinse the sheet with water.
Alat yang dibutuhkan:
Air Suling
Botol semprot cuci laboratorium3
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.
Alat yang dibutuhkan:
Timah(II) Klorida
Asam kloridaAir Suling
Botol semprot airBotol semprot cuci laboratorium
Kacamata Pelindung Cipratan KimiaSarung tangan karet4
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.
Material untuk langkah ini:
Perak Nitrat1 as requiredAlat yang dibutuhkan:
Larutan amonia 25-28 %
Larutan formaldehida (formalin 37 %)Air Suling
Pistol Semprot Dua NoselLemari asam (bersaluran buang)Kacamata Pelindung Cipratan KimiaSarung tangan karetBahan
2- 1 buahPlaceholder
- 1 as requiredPlaceholder
Alat yang Diperlukan
16- Placeholder
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