高粘度甲基硅油的合成及其拼混数学模型

Preparation of High Viscosity Methyl Silicone and It's Mathematic Model of Mixing

在催化剂四甲基氢氧化铵作用下，以八甲基环四硅氧烷（D4）和六甲基二硅醚（MM）为原料合成了高粘度甲基硅油。考察了催化剂用量、反应物中起始水分以及封头剂的加入温度及加入量等因素对产品粘度的影响。其最佳反应条件为：催化剂用量为m（催化剂）：m（D4）=8．0×10^-5：1，水分控制在0．5％～1．0％，封头剂的加入温度为85～90℃，封头剂的用量为m（封头剂）：m（D4）=1．0×10^-3。在此条件下，得到粘度（5．5～6．0）×10^2Pa·s的甲基硅油。并通过对不同粘度的甲基硅油进行拼混试验，建立了甲基硅油粘度拼混数学模型为m1 logμl＋m2 logμ2=（m1＋m2）logμ3，拼混得到的甲基硅油其粘度的实测值与计算值相对误差小于3％。

A kind of highly viscous methyl silicone was prepared by reacting octamethyl cyclotetrasiloxane （D4） with hexamethyl disiloxan as seal agent and tetra-methyi ammonium hydroxide as catalyst. The effects of the quantity of catalyst and seal agent, the small amount of moisture, and the temperature to add seal agent were studied, and the proper reaction conditions were obtained namely, the quantity of catalyst was 8.0 × 10^-5; the trace amount of moisture was controlled at 0.5% - 1.0% ; the quantity of seal agent was 1.0 × 10^-3 ; and the temperature to add seal agent was 85 ～90 ℃. The title product with viscosity of （5.5 -6.0）× 10^2 Pa＇s was obtained. The established mathematic model of the viscosity of the mixture of two different products was： m1 logμl＋m2 logμ2=（m1＋m2）logμ3. The relative error of the calculated value to experiment value is less than 3%.