SENI
KECANTIKAN & KESEJAHTERAAN
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BUDAYA & SEJARAH
HIBURAN
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KEJURUTERAAN TERBALIK
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SUKAN
TEKNOLOGI
BOLEH PAKAI
Epoxy Resin
Woody

Dicipta oleh

Woody

22. September 2026NO
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Epoxy Resin

Pierre Castan, a Swiss chemist at the dental firm De Trey Frères, was looking for a resin for dentures. He reacted a phenol carrying two hydroxy groups with epichlorohydrin, then hardened the product with an acid anhydride, and got a hard, clear, unusually adherent solid. Ciba licensed it and sold it as Araldite; in the US Sylvan Greenlee developed epoxies independently. **US 2,324,483**, "Process of preparing synthetic resins", Castan, granted 20. July 1943, claims condensing "a polybasic carboxylic acid anhydride" with the product of "a phenol having at least two phenolic hydroxy groups and of an epichlorhydrine". It does not single out bisphenol A, the phenol most epoxies use today. **Epichlorohydrin is a carcinogen; you start from a two-part kit.** You glue pine lap joints at the right ratio and four wrong ones, then test hardness and break the joints.
Pemula
2 hours plus 24 h cure

Arahan

1

Cut the joint pieces

Saw ten pine strips 100 x 25 mm. Sand one face of each end with 120 grit and dust off. Label five pairs 1:1, 1.25:1, 1:1.25, 1.5:1 and 1:1.5.

Bahan untuk langkah ini:

Papan painPapan pain1 keping
Kertas PasirKertas Pasir1 helaian
Pita pelekat kertasPita pelekat kertas1 gulung

Alatan diperlukan:

Gergaji TanganGergaji Tangan
Pembaris KeluliPembaris Keluli
PenselPensel
2

Measure by syringe

Gloves on. For each ratio draw resin and hardener in separate syringes (1:1 = 2 ml + 2 ml; 1.25:1 = 2.5 + 2; and so on) into its own cup. This assumes a 1:1-by-volume kit - scale to your label.

Bahan untuk langkah ini:

Epoksi dua komponenEpoksi dua komponen25 ml

Alatan diperlukan:

Sarung Tangan NitrilSarung Tangan Nitril
Set picagariSet picagari
Cawan pengadun berskalaCawan pengadun berskala
Cermin Mata Keselamatan JernihCermin Mata Keselamatan Jernih
3

Mix thoroughly

Stir each cup 2 minutes, scraping the walls and bottom. Unmixed streaks behave like a wrong ratio.

Alatan diperlukan:

Rod PengacauRod Pengacau
4

Glue and pour

Spread each mix on the sanded ends of its pair, overlap them 25 mm and spring-clamp over wax paper. Pour the rest as a coin-sized puddle on wax paper beside it.

Bahan untuk langkah ini:

Kertas berlilinKertas berlilin1 helaian

Alatan diperlukan:

Pengapit springPengapit spring
5

Cure 24 hours

Leave everything at room temperature, 20 °C or warmer, for 24 hours. Cold slows the cure.
6

Pencil hardness

Sharpen pencils 6B to 6H and flatten the tips on 400 grit. Push each at 45° across a puddle, from hard down, until one no longer scratches. Record that grade.

Alatan diperlukan:

Set Pensel GrafitSet Pensel Grafit
Kanta Pembesar Tukang EmasKanta Pembesar Tukang Emas
7

Break the joints

Clamp one strip of a joint in the vise and tap the free end sideways with the mallet until it breaks. Estimate how much of the bond face is torn wood.

Alatan diperlukan:

Ragum BangkuRagum Bangku
Tukul getahTukul getah
Cermin Mata Keselamatan JernihCermin Mata Keselamatan Jernih
8

Ratio, leftovers, results

Memuatkan buku nota Jupyter…
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History & Context

**What the patent specifies:** a resin from a two-hydroxy phenol and epichlorohydrin, hardened by a polybasic acid anhydride. **Modern build (derived):** a two-part kit, most with an amine hardener that cures at room temperature. Epoxy became the glue that holds metal, the matrix of fibreglass and carbon-fibre parts, and the boat-builder's resin. Its limits: it yellows in sunlight, softens with heat, and uncured resin and hardener sensitise skin - which is why the gloves stay on every time.

Bahan

5

Alatan Diperlukan

13

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CC0 Domain Awam

Blueprint ini dikeluarkan di bawah CC0. Anda bebas menyalin, mengubah, mengedar, dan menggunakan karya ini untuk sebarang tujuan, tanpa meminta kebenaran.

Sokong Pembuat dengan membeli produk melalui Blueprint mereka di mana mereka memperoleh Komisen Pembuat ditetapkan oleh Penjual, atau cipta iterasi baru Blueprint ini dan sertakan ia sebagai sambungan dalam Blueprint anda sendiri untuk berkongsi hasil.

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