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聚脲與聚脲脂之間的差異

日期：2017-6-9 发布者：三和盛小编

聚脲与聚氨酯有很大的差别，虽然对某些角度来说，聚脲已经被列入聚氨酯行列，但从它们的分子建构来说的话，仍然有很多的不同，而聚脲塗料较聚氨酯涂料更优越的性能，是否有可能替代聚氨酯涂料？

专家给出的答案是否定的。首先，聚脲与聚氨酯在分子结构的构成上存在很大差别，虽然同样都含有异氰酸酯成分，但是聚氨酯是由异氰酸酯和羟基构成，而聚脲则是由异氰酸酯和氨基构成，这决定了二者在应用性能上有一些的差别。

其次，就涂料这行业来说，聚脲与聚氨酯虽然都可应用喷涂技术，但是，聚脲至大的特点就是其固化程度快，多数使用在耐磨涂料上，另外，由于聚脲仍处于高等应用领域，因此全中国市场而言，价格高，用量少，据专家介绍，全中国聚脲塗料用量仅为3~4千吨。

另外，采访中专家还提到，聚脲塗料不含有机溶剂，环保性能是它优于聚氨酯涂料的重大优点。事实上，聚脲塗料和聚氨酯塗料分屬兩種不同類別的産品，雖然在某種程度上有重合的部分，但二者並不存在替代與不替代的問題。

本文关键词：聚脲青島聚脲 聚脲防水生産廠家

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[Pg 51] They saw a native ferry-boat at one point, which was heavily laden with a mixed cargo. According to Fred's inventory, the craft contained a horse and half a dozen men, together with a lot of boxes and bundles, which were, as the auctioneers say, too numerous to mention. The head of the horse was firmly held by the groom who had him in charge, as it[Pg 285] would have been a serious matter if the beast had broken away and jumped into the stream with all his load about him. A Japanese ferry-boat does not appear the safest thing in the world, but, somehow, one never hears of accidents with it. If any occur, they must be carefully kept out of the papers. never listened to a more illuminating exposition of the subject. J. A. Convinced that both the hydroplane and the yacht would have located the spot on the sea where they would meet, Jeff broke the tedium of his tight circle by a reverse of controls, banking to the other side and swinging in a climbing spiral to the right. Evidently Jeff either caught his thought or decided on a course through his own quick wit. "Stop it; stop it!" yelled Si, his temper again rising. "Great day, can't you fellers understand plain English when it's talked to you? What's the matter with you, anyway? Here, Bradshaw, when I give the order to count, you count one. Wheel wright, you count one at the same time. Williams and Talbot, you each count two. Then Aldrich, you and Reynolds count one, and so on." The Deacon rubbed his eyes and hastened a moment to the clamor outside. It seemed as if there were a thousand curs surrounding them, barking, howling, snarling, fighting, and scratching. He snatched up a club and sprang out, while Shorty tottered after. He ran into the midst of the pack, and began laying about with his strong arms. He broke the backs of some, brained others, and sent the others yelping with pain and fright, except two particularly vicious ones, who were so frenzied with hunger that they attacked him, and bit him pretty severely before he succeeded in killing them. Then he went around to the end of the crib nearest his precious hoard, and found that the hungry brutes had torn away his clay and even the larger of the stones, and nothing but their fighting among themselves had prevented the loss of his chickens. "What in tarnation set the beasts onto us," inquired Shorty wonderingly. "They were wuss'n cats around catnip, rats after aniseed, or cattle about a spot o' blood. I've felt that me and Si wuz in shape to bring the crows and buzzards around, but didn't expect to start the dogs up this way." Si saluted and took his position, facing the line, with a look of calm impartiality upon his face. Shorty turned around and backed up to him so that the calves of their legs touched, and began intently studying his gunlock. "I don't say he told the Baron," said Calverley; "but I believe Holgrave loves to make every body look worse than himself; and to be plain with you, John Byles, I love him not." "Fly, knaves!" cried the galleyman, addressing Byles and Calverley, as he released the latter. "And now, meddling steward, if you attempt to interfere with her who is in that holy berth yonder, or injure the honest yeoman, her son, for this night's doings, the Lord have mercy upon you! Here, Stephen," (walking towards Holgrave, who had thrown himself beside the grave,) "up, and jump behind on my horse, for the cry of sacrilege will edge their brands, and friend or foe will have little chance. There—the abbey-gate is thrown open, and out they come with brand and torch." HoME 高清无码伦理片集合 ENTER NUMBET 0014www.freeaicamp.com.cn
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