共查询到19条相似文献,搜索用时 93 毫秒
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二甲苯,甲醛在浓硫酸介质中合成XF树脂,XF树脂与顺酐缩聚生成耐腐蚀性不饱和树脂。生产过程中使用37%的甲醛不溶液,形成大量废酸,新工艺采用固体三聚甲醛,生成的废酸可以循环使用,同时提高了产品的收率。 相似文献
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防火涂料又称阻燃涂料。目前,其品种、性能、使用范围等方面逐步走向成熟,并且应用较为广泛。而过氯乙烯树脂与阻燃剂的合理化复配,则可以大大提高阻燃效果,成为目前研究的主要方向之一。 相似文献
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聚合物增塑剂由于具有优异的电气绝缘性能,耐化学性,耐迁移性以及耐老化性而受到塑料加工业的欢迎,二甲苯二醛树脂因原料价格便宜,制造工艺简单,增塑效果优良而在聚合物类增塑剂中得到发展。 相似文献
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含硼苯酚二甲苯缩甲醛树脂 总被引:1,自引:0,他引:1
苯酚、二甲苯缩甲醛树脂及硼酸反应生成缩醛树脂。本研究不用甲醛而用二甲苯甲醛树脂作为缩醛剂,硼酸在反应初期起着催化剂的作用,后期则和酚羟基反应生成酯,硼酸酯和二甲苯使树脂具有良好的耐热性能和耐腐蚀性能。发现二甲苯甲醛树脂可以作为酚醛树脂的固化剂。 相似文献
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简要介绍了新型过氯乙烯树脂的制备工艺之后,着重讨论了新型树脂制备防腐涂料的一般方法及比较了和溶剂法过氯乙烯的不同。 相似文献
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二甲苯甲醛不饱和聚酯树脂制备及性能研究 总被引:1,自引:0,他引:1
本文主要介绍了二甲苯甲醛不饱和聚酯树脂的合成工艺和反应机理,并在聚合速率、聚酯结构、固化成型、机械强度、防腐性能等方面进行了研究。 相似文献
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简单介绍了题述树脂的生产与应用,并与溶剂法生产过氯乙烯树脂的生产工艺及产品性能进行了对比。指出该新工艺具有工艺流程短、不使用溶剂等优点,产品生产成本每吨下降2000元左右,而产品可用于溶剂法过氯乙烯的所有领域。 相似文献
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GB/T 25259《过氯乙烯树脂涂料》国家标准与原行业标准的主要差异 总被引:1,自引:0,他引:1
对国家标准GB/T 25259《过氯乙烯树脂涂料》与原化工行业标准作了比较,指出其主要差异。 相似文献
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聚氯乙烯和过氯乙烯树脂的毒性 总被引:1,自引:0,他引:1
一、聚氯乙烯的毒性 聚氯乙烯-[-CH_2GHCl-]-n M=300000~400000 氯乙烯聚合产物。直碳链的无定形结构的聚合物。白色半透明固体物质。密度1.35~1.43。为提高聚氯乙烯耐热老化和耐光老化的稳定性在聚氯乙烯中添加有稳定剂—铅、锌、钡—镉化合物、有机锡化合物、胺类及其他化合物。为增加弹性在聚氯乙烯的组份中添加有不同种类的增塑剂,其中最著名的是邻苯二甲酸酯和磷酸酯。无增塑的聚氯乙烯材料称为硬聚氯乙烯塑料。以聚氯 相似文献
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The effect of some types of xylene formaldehyde on epoxy resin adhesive is studied. Xylene formaldehyde resin or modified xylene formaldehyde resins are mixed into liquid epoxy resin and curing properties of the blends, their adhesive properties and the dispersion state of xylene formaldehyde resin in cured adhesive film are examined. The results obtained are as follows.
1) Generally, by the addition of xylene formaldehyde resins, the degree of curing of blends are decreased, but pot life is prolonged, and tensile shear strength of steel bonds is increased.
2) It is observed that effects of the amount of xylene formaldehyde resins and curing condition on tensile shear strength vary with the kind of xylene formaldehyde resin, because of the difference in chemical structure of xylene formaldehyde resins and their reactivity to epoxy resin.
3) It is found that a limited region of compatibility, between 80 and 100 phr, exists for 100% xylene formaldehyde resin in epoxy resin. It is also found that joint strength is reduced with higher viscosity and molecular weight of 100% xylene formaldehyde resin in the case of 80 phr blends, and that these results have some relation to the dispersion state of xylene formaldehyde resin in epoxy resin, judging from the cured adhesive film observed under a phase contrast microscope. 相似文献
1) Generally, by the addition of xylene formaldehyde resins, the degree of curing of blends are decreased, but pot life is prolonged, and tensile shear strength of steel bonds is increased.
2) It is observed that effects of the amount of xylene formaldehyde resins and curing condition on tensile shear strength vary with the kind of xylene formaldehyde resin, because of the difference in chemical structure of xylene formaldehyde resins and their reactivity to epoxy resin.
3) It is found that a limited region of compatibility, between 80 and 100 phr, exists for 100% xylene formaldehyde resin in epoxy resin. It is also found that joint strength is reduced with higher viscosity and molecular weight of 100% xylene formaldehyde resin in the case of 80 phr blends, and that these results have some relation to the dispersion state of xylene formaldehyde resin in epoxy resin, judging from the cured adhesive film observed under a phase contrast microscope. 相似文献
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二甲苯不饱和聚酯树脂的研制 总被引:1,自引:0,他引:1
先利用二甲苯与甲醛在酸性条件下合成二甲苯甲醋树脂,并利用顺丁烯二酸对其进行改性实验制得了二甲苯不饱和聚酯树脂。为测试二甲苯不饱和不聚酯树脂的应用性能佬了固化实验,从而确定了合成二甲苯不饱和聚酯树脂地最佳条件。 相似文献
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