Polyether modified polysiloxane defoaming agent was prepared by using hydrogenous polysiloxane and polyether as starting material.Effects of different reaction conditions and blendings on the conversion and the defoming property were discussed.The optimum conditions had been confirmed as 100 ℃～105 ℃,reaction time 10 h～12h,the mole ratio of hydrogenous polysiloxane to polyether 1∶2.Under the optimum conditions the conversion can achieve higher than 80 %.The blend that contains 10 % mass fraction of silicone oils,2 % mass fraction of emulsifiers is compared with other foreign and the domestic products.
聚硅氧烷類消泡劑具有消泡迅速、抑泡時(shí)間長(zhǎng)和安全無毒等特點(diǎn),但它難溶于水,耐高溫、耐強(qiáng)堿性差;聚醚類消泡劑水溶性好,耐高溫、耐強(qiáng)堿性強(qiáng),但其消泡速度和抑泡時(shí)間都不甚理想。通過縮合接枝在聚硅氧烷鏈上引入聚醚鏈,這種聚醚改性硅油類共聚物可改善溶解性,提高消泡效力,使之不僅兼有原兩類消泡劑的優(yōu)點(diǎn),而且還具有諸如逆溶解性強(qiáng)、自乳性好、化學(xué)穩(wěn)定性和熱穩(wěn)定性高等獨(dú)特優(yōu)點(diǎn),拓寬了聚硅氧烷類消泡劑的應(yīng)用領(lǐng)域。目前,國(guó)外已有該類產(chǎn)品問世[1～3],但價(jià)格較高,而國(guó)內(nèi)此類產(chǎn)品正處于研制階段。

不是很多，希望對(duì)你有幫助O(∩_∩)O

標(biāo)簽：好帶聚硅氧烷聚醚