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ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
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ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
PVA Wood Glue by Emulsion Polymerisation
White wood glue is polyvinyl acetate (PVAc) dispersed in water. It is made by emulsion polymerisation: vinyl acetate monomer is stirred into water with a stabiliser, here polyvinyl alcohol, and a water-soluble initiator such as a persulfate, which splits into radicals above about 50 °C and starts chains that link the monomer into polymer. The water carries away the heat, so the reaction stays under control. More monomer is usually fed in slowly as the particles grow. What comes out is a milky dispersion, and for glue that dispersion is the product. Vinyl acetate itself is made from ethylene, acetic acid and oxygen over a palladium catalyst.
Ilọsíwájú
Hours per batch (industrial)
Ìlànà
1
1
Charge the reactor
Charge the reactor
Fill the jacketed reactor with water and dissolve the polyvinyl alcohol, which keeps the polymer particles from clumping.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Omi Àyọ́1 as required
Ẹ̀lúbọ́ polyvinyl alcohol1 as requiredÀwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣe polymer oníbora2
2
Heat and start
Heat and start
Warm the water to above about 50 °C, add part of the monomer and the persulfate initiator; the initiator splits into radicals and polymerisation begins.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Monomer vinyl acetate1 as required
Èròjà ìbẹ̀rẹ̀ persulfate1 as requiredÀwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣe polymer oníbora3
3
Feed and hold
Feed and hold
Feed the rest of the monomer in slowly while stirring; the jacket removes the heat of reaction so the temperature stays steady.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣe polymer oníbora4
4
Finish
Finish
When the monomer is used up, cool the milky dispersion. It is used as it is: as wood glue, white or yellow carpenter's glue.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣe polymer oníboraÀwọn ohun-èlò
4- 1 as requiredÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
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