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Neoprene
Tex

Imeundwa na

Tex

22. Septemba 2026FO
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Neoprene

Natural rubber swells and softens in oil and cracks in sunlight. In April 1930 Arnold Collins, working in Wallace Carothers' group at DuPont, isolated chloroprene - a close relative of the isoprene in natural rubber, with one chlorine atom in place of a methyl group - and found that it polymerised by itself into a rubber-like solid. DuPont sold it from 1931 as DuPrene and renamed it neoprene in 1937. It was one of the first commercially successful synthetic rubbers, and its selling point was exactly what natural rubber lacked: resistance to oil, weather and heat. **No patent number is cited here**: the chemistry is well documented and dated, but no single patent was verified as covering neoprene itself, so none is claimed. **You make a snug neoprene sleeve with a glued-and-stitched butt seam, then test the claim** - a strip of neoprene and a natural rubber band in mineral oil for a day, measured before and after.
Mwanzo
2 hours plus 24 h soak

Maagizo

1

Size the sleeve

Measure the bottle diameter. Run the notebook's sizing cell for the cut width and base disc.

Zana zinazohitajika:

Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Rula ya chumaRula ya chuma
2

Mark the pieces

On 3 mm neoprene, chalk a rectangle: cut width x 200 mm tall. Chalk the base disc beside it.

Vifaa kwa hatua hii:

Kitambaa cha neopriniKitambaa cha neoprini1 karatasi

Zana zinazohitajika:

Chaki ya mshonajiChaki ya mshonaji
Rula ya chumaRula ya chuma
3

Cut

Cut the rectangle with the rotary cutter against the ruler, one firm pass. Cut the disc with fabric scissors.

Zana zinazohitajika:

Seti ya Kisu cha Gurudumu na Bamba la KukatiaSeti ya Kisu cha Gurudumu na Bamba la Kukatia
Mkasi wa nguoMkasi wa nguo
4

Cement the edges

Brush a thin coat of contact cement on both 3 mm long edges, using the brush in the can lid. Leave until touch-dry, as the can directs.

Vifaa kwa hatua hii:

Gundi ya mgusanoGundi ya mgusano10 ml

Zana zinazohitajika:

Saa ya kupima mudaSaa ya kupima muda
5

Butt the seam

Roll into a tube and press the edges face to face, no overlap. Contact cement grabs on touch - align the top first, then close downward. Clip and leave 10 minutes.

Zana zinazohitajika:

Klipu kubwa za kubana karatasiKlipu kubwa za kubana karatasi
6

Stitch across the seam

Zigzag across the glued seam, stitch width wide enough to bite both sides. Stretch slightly as you sew so the thread gives with the fabric.

Vifaa kwa hatua hii:

Uzi wa polyestaUzi wa polyesta5 mita

Zana zinazohitajika:

CherehaniCherehani
7

Close the base

Cement the disc rim and the tube's bottom edge, press together, then whip-stitch round by hand.

Vifaa kwa hatua hii:

Gundi ya mgusanoGundi ya mgusano5 ml
Uzi wa polyestaUzi wa polyesta2 mita

Zana zinazohitajika:

Sindano za kushona kwa mkonoSindano za kushona kwa mkono
8

Set up the swell test

Cut a 50 x 10 mm neoprene offcut. Cut open a rubber band to a 50 mm strip. Measure both. Submerge in mineral oil in a lidded jar for 24 hours.

Vifaa kwa hatua hii:

Mafuta ya madini yanayofaa chakulaMafuta ya madini yanayofaa chakula100 ml
Mipira ya kufungaMipira ya kufunga1 paketi

Zana zinazohitajika:

Chupa ya KiooChupa ya Kioo
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
9

Measure again

Blot the strips dry and measure their lengths. Enter all four numbers in the notebook.

Zana zinazohitajika:

Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
10

Chlorine, swell and sizing

Inapakia daftari la Jupyter…
11

History & Context

Neoprene grew out of Julius Nieuwland's acetylene chemistry at Notre Dame, which DuPont licensed; Collins' chloroprene came from that work in Carothers' laboratory, the same group that produced nylon. Its limits are the other side of its strength: it costs more than natural rubber, is less springy, and stiffens in deep cold. The sheet you used is almost certainly closed-cell neoprene FOAM laminated to nylon jersey - the form wetsuits made familiar - where trapped gas cells add insulation that solid neoprene lacks.

Vifaa

5

Zana Zinazohitajika

10

Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Vulcanizing Rubber with Sulfur — The Accidental Discovery That Put Tyres on the Road

Vulcanizing Rubber with Sulfur — The Accidental Discovery That Put Tyres on the Road

na CharlieDE

Viwandani

81
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3
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Ebonite (Hard Rubber)

Ebonite (Hard Rubber)

na MaryFI

Nyenzo

0
0
0
0
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CC0 Umma Wote

Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.

Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.

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