环氧树脂改性三乙烯四胺固化剂的合成及性能研究

采用环氧树脂E44对三乙烯四胺(TETA)固化剂进行改性及其性能的研究。实验结果表明:最佳改性条件为n(AGE):n(E44):n(TETA)=4.5:1:3,反应温度为50℃,反应时间为3h,可制备出水溶性优异,与环氧树脂乳液相容性优良的改性环氧树脂固化剂,其比未改性的三乙烯四胺有优异的物理化学性能和环保性能。该固化剂以水为溶剂,大大降低了制备出的涂料的VOC含量。

Technique and experiment of active direct gas pressure measurement in coal roadway

An active measurement method and its principle was introduced consideringthe low success rate,special difficulty,and long measurement time of the direct gas pressuremeasurement currently used in coal roadways.The technology of drilling,boreholesealing depth,borehole sealing length,sealing control of the measuring process,compensatorycomputation of gas loss quantity and other key techniques were discussed.Finally,based on the latest instrument the authors developed,a series of experiments of directgas pressure measurement in the coal roadways of the Jincheng and Tongchuanmine district,were carried out.The experimental results show that active gas pressuremeasurement technique has advantages as follows:(1) the application scope of direct gaspressure measurement technique is wide and it does not have the restriction of coalhardness,coal seam fissure and other conditions;(2) the measured results are credible,which can be tested by the same gas pressure value acquired from a different borehole inthe same place;(3) the measurement process is convenient and quick,it takes about 2 to3 days to acquire the gas pressure value in a coal seam.

对我国部分煤矿粉尘微量元素含量的分析

本文通过对我国煤炭资源地理分布及煤炭种类进行分析,取样调查了开滦集团东欢坨煤矿、汾西矿业贺西煤矿、神火集团新庄煤矿、阳煤集团阳泉一矿、阳煤集团长沟矿、金地公司赤峪煤矿、神东集团大柳塔煤矿的7个不同煤质样品中对人体有危害的10种元素采用ICP-MS进行定量分析,得出以上煤矿粉尘危害的主要元素,使煤矿企业在职工粉尘危害防御中能够更加有针对性,对职业健康管理具有较重要的意义。