A process of encapsulating water-immiscible material within discrete capsules of polyurea without addition of a second reactant, whereby hydrolysis of an isocyanate mo- nomertoform an amine takes place, which in turn reacts with another isocyanate monomer to form polyurea, which comprises the steps of
(a) providing at room temperature, a dispersion of
(i) a plurality of water-immiscible phases, each phase comprising the water-immiscible material to be encapsulated and at least one organic polyisocyanate in
(ii) an aqueous phase comprising a solution of water, a surfactant and a protective colloid; and
(b) heating and maintaining said dispersion in a temperature range of about 40° C to about 90° C, whereupon said water-immisicible material is encapsulated within discrete polyurea capsuler enclosures directly usable without further separation or purification.
一种在不添加第二反应物的情况下将不溶于
水的材料封装在聚
脲离散胶囊中的工艺,其中
异氰酸酯单体
水解生成胺,胺又与另一种
异氰酸酯单体反应生成聚
脲,该工艺包括以下步骤
(a) 在室温下提供以下物质的分散液
(i) 多个不溶于
水的相,每个相包括待封装的不溶于
水的材料和至少一种 有机多
异氰酸酯,其中包括
(ii)
水相,包括
水溶液、表面活性剂和保护胶体;以及
(b) 将所述分散液加热并保持在约 40°C 至约 90°C 的温度范围内,然后将所述 可混
水材料封装在离散的聚
脲胶囊外壳内,无需进一步分离或纯化即可直 接使用。