कला
सुन्दरता र कल्याण
हस्तकला
संस्कृति र इतिहास
मनोरञ्जन
वातावरण
खाना र पेय
रिभर्स इन्जिनियरिङ
विज्ञान
खेलकुद
प्रविधि
पहिर्न मिल्ने
Silicone (Rochow Direct Process)
Silicones - chains of silicon and oxygen carrying methyl groups - were known from Frederic Kipping's laboratory work, but could only be made a few grams at a time. In 1940 Eugene Rochow at General Electric found a one-step route: pass methyl chloride over hot silicon with copper, and methylchlorosilanes come straight off. Richard Müller found the same reaction independently in Germany, which is why it is also called the Müller-Rochow process. It is how silicones are still made.
**US 2,380,995**, "Preparation of organosilicon halides", Rochow, assigned to General Electric, granted 7. August 1945, claims "effecting reaction between silicon and a hydrocarbon halide" with a copper catalyst at 200–500 °C.
**Methyl chloride and chlorosilanes are toxic and stay in the plant.** You use the product: a two-part silicone mould of glass marbles, then cast hot wax in it, again and again.
शुरुआती
4 hours plus two cures
निर्देशनहरू
1
1
Build the box
Build the box
Cut foam board and hot-glue an open box 60 x 40 mm inside, 50 mm tall. Seal every inside seam with a bead of glue - silicone finds any gap.
यस चरणका सामग्री:
नमुना बनाउने फोम पाता1 पानाचाहिने औजार:
हस्तकलाको चक्कु
तातो टाँसोको बन्दुक
फलामे रुल2
2
Clay bed and keys
Clay bed and keys
Press sulphur-free modelling clay 20 mm deep into the box. Push two 16 mm marbles exactly halfway in, 20 mm apart. Press four dimples in the clay with a pencil end: these are the registration keys.
यस चरणका सामग्री:
मूर्ति बनाउने माटो150 ग्राम
सिसाका गुच्चा2 टुक्राचाहिने औजार:
डिजिटल क्यालिपर ६ इन्च3
3
Weigh and mix
Weigh and mix
Weigh part A and part B at the kit's stated ratio into a mixing cup (the notebook gives the mass). Stir 3 minutes, scraping sides and bottom.
यस चरणका सामग्री:
सिलिकन साँचो बनाउने किट1 किटचाहिने औजार:
सूक्ष्म डिजिटल तराजु
नाप अङ्कित मिसाउने कप
चलाउने डण्डी4
4
First pour
First pour
Pour in a thin stream from 30 cm into one corner, never onto the marbles, until 6 mm above them. Cure for the kit's time.
चाहिने औजार:
नाप अङ्कित मिसाउने कप5
5
Flip and release
Flip and release
Flip the box, peel away all clay and leave the marbles in the silicone. Brush a thin coat of petroleum jelly over the silicone face - silicone bonds to silicone.
यस चरणका सामग्री:
भ्यासलिन5 ग्राम6
6
Second pour
Second pour
Mix a second batch the same way and pour 6 mm above the marbles. Cure again.
यस चरणका सामग्री:
सिलिकन साँचो बनाउने किट1 किटचाहिने औजार:
सूक्ष्म डिजिटल तराजुनाप अङ्कित मिसाउने कप7
7
Open and cut sprues
Open and cut sprues
Tear off the foam board, part the halves and pop out the marbles. With the craft knife cut a 5 mm cone from the top face into each cavity.
चाहिने औजार:
हस्तकलाको चक्कु8
8
Cast wax
Cast wax
Melt paraffin wax in the double boiler to 75 °C. Band the halves shut, pour through each sprue, cool 30 minutes, open. Count how many casts it survives.
यस चरणका सामग्री:
प्यारफिन मैन100 ग्राम
रबर ब्यान्ड1 प्याकचाहिने औजार:
दोहोरो भाँडो
मिठाईको थर्मोमिटर
वेल्डिङका पन्जा
सफा सुरक्षा चस्मा9
9
Troubleshoot the mould
Troubleshoot the mould
Work down in order; each question points to one step to redo.
Flow
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10
10
Reaction, pour size, siblings
Reaction, pour size, siblings
Jupyter नोटबुक लोड हुँदैछ…
11
11
History & Context
History & Context
**What the patent specifies:** silicon reacted with a hydrocarbon halide over copper at 200–500 °C to give organosilicon halides. **Modern build (derived):** a two-part room-temperature-curing mould silicone.
Silicone first served in the Second World War as grease and insulation for aircraft ignition systems; today it is sealant, bakeware, medical tubing and every maker's mould rubber. Its limits: it tears easily once nicked, is expensive, and a platinum-cure grade will not set against sulphur, some clays and latex gloves.
सामग्री
7- नमुना बनाउने फोम पाता10% कमिसन1 पानाप्लेसहोल्डर
- 150 ग्रामप्लेसहोल्डर
- 2 टुक्राप्लेसहोल्डर
- प्लेसहोल्डर
- 5 ग्रामप्लेसहोल्डर
- 100 ग्रामप्लेसहोल्डर
- 1 प्याकप्लेसहोल्डर
आवश्यक उपकरणहरू
11- प्लेसहोल्डर
- प्लेसहोल्डर
- प्लेसहोल्डर
- प्लेसहोल्डर
- प्लेसहोल्डर
- प्लेसहोल्डर
- प्लेसहोल्डर
- प्लेसहोल्डर
- प्लेसहोल्डर
- वेल्डिङका पन्जा10% कमिसनप्लेसहोल्डर
- प्लेसहोल्डर
सम्बन्धित ब्लुप्रिन्ट
यी ब्लुप्रिन्टहरूले ज्ञान साझा गर्छन् — प्रविधि, सामग्री वा सिद्धान्त
CC0 सार्वजनिक डोमेन
यो ब्लुप्रिन्ट CC0 अन्तर्गत जारी गरिएको छ। तपाईं अनुमति नसोधी प्रतिलिपि, परिमार्जन, वितरण र प्रयोग गर्न सक्नुहुन्छ।
ब्लुप्रिन्ट मार्फत उत्पादनहरू किनेर सिर्जनाकर्तालाई सहयोग गर्नुहोस् सिर्जनाकर्ता कमिसन विक्रेताले तोकेको, वा यो ब्लुप्रिन्टको नयाँ संस्करण बनाउनुहोस् र आम्दानी बाँड्न आफ्नो ब्लुप्रिन्टमा जडानको रूपमा समावेश गर्नुहोस्।