硅烷改性聚氨酯密封膠增塑劑對(duì)力學(xué)性能的影響

發(fā)布時(shí)間 : 2024-9-6 16:33:34
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硅烷改性聚氨酯密封膠增塑劑對(duì)力學(xué)性能的影響

發(fā)布時(shí)間 : 2024-9-6 16:33:34
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幾種增塑劑對(duì)硅烷改性聚氨酯密封膠固化速度的影響。由圖2可知，聚醚二元醇的固化速度最快，聚醚三元醇次之，丁一50最I(lǐng)。采用與預(yù)聚物結(jié)構(gòu)相似的增塑劑，會(huì)使水分?jǐn)U散速度加快，因此聚醚多元醇增塑劑表現(xiàn)優(yōu)異。DIDP、苯甲酸酚、丁一50 3種增塑劑分子結(jié)構(gòu)中均含有烷基長(zhǎng)鏈結(jié)構(gòu)，烷基長(zhǎng)鏈結(jié)構(gòu)為疏水基團(tuán)，并隨著碳原子數(shù)的增多疏水性增強(qiáng)，故丁一50的固化速度最慢。

增塑劑會(huì)降低硅烷改性聚氨酯密封膠固化物硬度，提高固化物的柔順性和斷裂伸長(zhǎng)率。表2為幾種增塑劑對(duì)硅烷改性聚氨酯密封膠力學(xué)性能的影響。隨著增塑劑中直鏈長(zhǎng)度的延長(zhǎng)可以適當(dāng)提高硅烷改性聚氨酯密封膠的斷裂伸長(zhǎng)率，因此下一50.DID戶、苯甲酸醋呈現(xiàn)出這一規(guī)律。而以聚醚多元醇為增塑劑的硅烷改性聚氨酯密封膠，斷裂伸長(zhǎng)率要高于普通增塑劑，是由于聚醚多元醇與預(yù)聚物發(fā)生擴(kuò)鏈反應(yīng)，將預(yù)聚物主鏈延長(zhǎng)，提高了斷裂伸長(zhǎng)率，并能保持較好的力學(xué)性能。聚醚多元醇的加入可以提高預(yù)聚物的交聯(lián)密度，拉伸強(qiáng)度要高于加入其他3種增塑劑的體系。

增塑劑對(duì)粘接性能的影響將鋼試片用剛玉砂布打磨均勻，然后用丙酮(或丁酮)擦拭干凈，再用水沖洗后晾干，用氧化劑處理液處理1 5 mm，取出試片，用水沖洗干凈，于105一110℃烘干。試片用硅烷改性聚氨酯密封膠粘接后在(23士2)℃.R日( 55士5)%的環(huán)境中固化7d，于拉力試驗(yàn)機(jī)上測(cè)試?yán)旒羟袕?qiáng)度，結(jié)果如表3所示。http://www.ruilingxiang.cn/

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