艺术
美容与健康
工艺
文化与历史
娱乐
环境
食品与饮料
逆向工程
科学
体育
技术
可穿戴设备
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.
高级
Hours per batch (industrial)
说明
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.
此步骤所需材料：
蒸馏水1 as required
聚乙烯醇粉末1 as required所需工具：
夹套聚合反应釜2
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.
此步骤所需材料：
醋酸乙烯单体1 as required
过硫酸盐引发剂1 as required所需工具：
夹套聚合反应釜3
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.
所需工具：
夹套聚合反应釜4
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.
所需工具：
夹套聚合反应釜
相关蓝图
这些蓝图共享知识——技术、材料或原理
CC0 公共领域
此蓝图以 CC0 协议发布。你可以自由复制、修改、分发和使用此作品，无需征得许可。
通过购买蓝图中的产品支持创客，他们将获得 创客佣金 （由供应商设定），或创建此蓝图的新版本并将其作为连接包含在你自己的蓝图中以分享收入。