?

欧美熟妇一区二区三区夜色视频|久久熟女av一区二区三区|亚洲精品国产肉丝袜久久|狼友在线无码免费视频

<strike id="pl5vt"></strike>
<span id="pl5vt"></span>
<th id="pl5vt"></th>
<span id="pl5vt"><noframes id="pl5vt"><span id="pl5vt"></span><span id="pl5vt"></span><th id="pl5vt"><video id="pl5vt"></video></th><span id="pl5vt"></span>
<span id="pl5vt"><noframes id="pl5vt"><span id="pl5vt"></span>
<span id="pl5vt"><video id="pl5vt"></video></span>
<span id="pl5vt"><noframes id="pl5vt"><span id="pl5vt"></span>
<span id="pl5vt"><noframes id="pl5vt">
<span id="pl5vt"></span>
<th id="pl5vt"><noframes id="pl5vt">
<strike id="pl5vt"><noframes id="pl5vt"><strike id="pl5vt"></strike>

新聞資訊

真假聚脲在使用壽命的主要區別

作者:admin 來源:http://www.elisepatterns.com 時間:2016-09-02
優惠
  由于化學活性不足,假聚脲中必須摻催化劑才能正常使用。催化劑的加入同時增加了NCO組分與水的反應活性,因而更容易發泡,也造成了體系不穩定、老化加劇等一系列負面影響。催化劑在完成加速聚合反應后,會長期殘留在生成的聚合物材料中,生成的材料在經受陽光、氧氣、水以及各種腐蝕介質侵蝕、劣化的誘導因素,從而產生自由基,導致分子鏈斷裂、材料性能下降,終導致耐老化性能降低,使用壽命不及純聚脲的1/10。本文鏈接:http://www.elisepatterns.com
http://www.elisepatterns.com/a/mtgz/109.html

聚氨酯原料|聚氨酯黑白(AB)料|聚氨酯噴涂料|聚氨酯澆注料|山東科佳集團|聚氨酯黑料|聚氨酯白料|聚氨酯A料|聚氨酯B料|濟南科佳聚氨酯有限公司|山東科佳節能材料有限公司

<strike id="pl5vt"></strike>
<span id="pl5vt"></span>
<th id="pl5vt"></th>
<span id="pl5vt"><noframes id="pl5vt"><span id="pl5vt"></span><span id="pl5vt"></span><th id="pl5vt"><video id="pl5vt"></video></th><span id="pl5vt"></span>
<span id="pl5vt"><noframes id="pl5vt"><span id="pl5vt"></span>
<span id="pl5vt"><video id="pl5vt"></video></span>
<span id="pl5vt"><noframes id="pl5vt"><span id="pl5vt"></span>
<span id="pl5vt"><noframes id="pl5vt">
<span id="pl5vt"></span>
<th id="pl5vt"><noframes id="pl5vt">
<strike id="pl5vt"><noframes id="pl5vt"><strike id="pl5vt"></strike>