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Epoxy Resin
Woody

Dibuat 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

Instruksi

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.

Material untuk langkah ini:

Papan pinusPapan pinus1 buah
AmplasAmplas1 lembar
Selotip kertasSelotip kertas1 gulung

Alat yang dibutuhkan:

Gergaji TanganGergaji Tangan
Penggaris BajaPenggaris Baja
PensilPensil
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.

Material untuk langkah ini:

Epoksi dua komponenEpoksi dua komponen25 ml

Alat yang dibutuhkan:

Sarung Tangan NitrilSarung Tangan Nitril
Set alat suntikSet alat suntik
Cangkir pencampur berskalaCangkir pencampur berskala
Kacamata Pengaman BeningKacamata Pengaman Bening
3

Mix thoroughly

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

Alat yang dibutuhkan:

Batang PengadukBatang Pengaduk
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.

Material untuk langkah ini:

Kertas lilinKertas lilin1 lembar

Alat yang dibutuhkan:

Jepit pegasJepit pegas
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.

Alat yang dibutuhkan:

Set Pensil GrafitSet Pensil Grafit
Lup PembesarLup Pembesar
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.

Alat yang dibutuhkan:

Ragum MejaRagum Meja
Palu karetPalu karet
Kacamata Pengaman BeningKacamata Pengaman Bening
8

Ratio, leftovers, results

Memuat notebook Jupyter…
9

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
  • 1
    Papan pinus
    1 buah
    Placeholder
  • 1
    Amplas
    1 lembar
    Placeholder
  • 1
    Selotip kertas
    1 gulung
    Placeholder
  • 2
    Epoksi dua komponenkomisi 10%
    25 ml
    Placeholder
  • 4
    Kertas lilin
    1 lembar
    Placeholder

Alat yang Diperlukan

13

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Pembuatan Plastik

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CC0 Domain Publik

Cetak biru ini dirilis di bawah CC0. Anda bebas untuk menyalin, memodifikasi, mendistribusikan, dan menggunakan karya ini untuk tujuan apa pun, termasuk komersial, tanpa meminta izin.

Dukung Maker dengan membeli produk melalui Cetak Biru mereka di mana mereka mendapatkan Komisi Pembuat yang ditetapkan oleh Penjual, atau buat iterasi baru dari Cetak Biru ini dan masukkan sebagai koneksi di milik Anda sendiri.

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