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以聚醚改性硅油为相容剂,硅橡胶和环氧树脂(EP)混合固化制备了具有较高强度和良好脱模性能的EP软模。红外光谱(FT-IR)分析表明聚醚改性硅油的合成物中含有聚醚与硅油基团,说明反应能够顺利进行;在聚醚改性硅油作用下,硅橡胶与EP具有良好的相容性,并可通过增减硅橡胶的用量来调节模具的强度,同时模具的使用寿命显著增加,使用次数至少为硅橡胶模具的100倍;硬脂酸锌的加入使模具的表面张力降低,脱模性能明显提高,并且已达到菱镁制品的脱模要求。当硅橡胶的质量分数为30%时,加入20%的硬脂酸锌可使模具的表面张力降至24.83×10-5 N/cm。
The EP soft mold with high strength and good demoulding performance was prepared by mixing polyether modified silicone oil as compatibilizer and silicone rubber and epoxy resin (EP). Infrared spectrum (FT-IR) analysis showed that the polyether-modified silicone oil containing polyether and silicone oil group, indicating that the reaction can proceed smoothly; under the action of polyether-modified silicone oil, silicone rubber and EP have good compatibility And can increase and decrease the amount of silicone rubber to adjust the strength of the mold, while significantly increasing the service life of the mold, the use of at least 100 times the silicone rubber mold; zinc stearate added to the mold surface tension decreased, off Mold can be significantly improved, and has reached the magnesite product stripping requirements. When the mass fraction of silicone rubber is 30%, adding 20% zinc stearate can reduce the surface tension of the mold to 24.83 × 10-5 N / cm.