SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
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.
Juu
Hours per batch (industrial)
Maagizo
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.
Vifaa kwa hatua hii:
Maji yaliyosafishwa kwa mvuke1 as required
Unga wa polivinili alkoholi1 as requiredZana zinazohitajika:
Rakta ya upolimishaji yenye koti2
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.
Vifaa kwa hatua hii:
Monoma ya vinili asetati1 as required
Kianzishi cha persulfati1 as requiredZana zinazohitajika:
Rakta ya upolimishaji yenye koti3
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.
Zana zinazohitajika:
Rakta ya upolimishaji yenye koti4
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.
Zana zinazohitajika:
Rakta ya upolimishaji yenye kotiVifaa
4- 1 as requiredKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
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.