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REVERSE ENGINEERING
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IZINTO EZIGQOKWAYO
Acrylic Mirror Sheet: Silver Sprayed on Acrylic Treated with Tannin in Water and Methanol
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 methanol solution: 45–70 % water, 30–55 % methanol by volume, 2.7–4.3 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.
Ophakathi
2 hours
Imiyalelo
1
1
Dip in tannin solution for one minute
Dip in tannin solution for one minute
Make a solution of 2.7–4.3 g of tannic acid per litre in 45–70 % water and 30–55 % methanol by volume. Dip the acrylic sheet in it for one minute.
Izinto zokwakha zalesi sinyathelo:
Ipuleti Le-akhriliki1 ucezuAmathuluzi adingekayo:
I-Tannic Acid
I-methanol
Amanzi Acwengisisiwe
Amathileyi engilazi
Isilinda esinezilinganiso
Isikali sesilinganiso
Ikhabethe lomusi (elinepayipi)
Amagilavu erabha2
2
Rinse with water
Rinse with water
Rinse the sheet with water.
Amathuluzi adingekayo:
Amanzi Acwengisisiwe
Ibhodlela Lokuhlambulula3
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.
Amathuluzi adingekayo:
I-Stannous Chloride
I-hydrochloric acidAmanzi Acwengisisiwe
Ibhodlela lokufafaza amanziIbhodlela Lokuhlambulula
Izibuko Zokuchitheka KwamakhemikhaliAmagilavu erabha4
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.
Izinto zokwakha zalesi sinyathelo:
I-Silver Nitrate1 as requiredAmathuluzi adingekayo:
Isixazululo se-ammonia - 25-28 %
Isixazululo se-formaldehyde (i-formalin engu-37 %)Amanzi Acwengisisiwe
Isibhamu Sokufutha Esinemilomo EmibiliIkhabethe lomusi (elinepayipi)Izibuko Zokuchitheka KwamakhemikhaliAmagilavu erabhaIzinto
2- 1 ucezuIsibambeli
- 1 as requiredIsibambeli
Amathuluzi Adingekayo
16- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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