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Wang J.,Jiangsu Province Special Equipment Safety Supervision Inspection Institute Branch of Xuzhou | Jiang L.,China University of Mining and Technology | Xue A.-X.,Jiangsu Province Special Equipment Safety Supervision Inspection Institute Branch of Xuzhou
Xiandai Huagong/Modern Chemical Industry | Year: 2011

With the measure desiccators method, this dissertation studies the affect factors of formaldehyde release in UF glue with attapulgite as the additive; it also takes the optimized experiment with formaldehyde release test of each UF glue, which singly take the original attapulgite, purified attapulgite as the additive. The result shows that formaldehyde emission is influenced by the granularity, purity and quantity of attapulgite; the quantity of curing agent, the testing temperature. The quantity of curing agent is 2%, the curing temperature is 120°C, the curing time is 10 min, the quantity of additive 15% purified attapulgite and 10% flour or more, its emission of formaldehyde can be lower. Source


Ren Z.,Jiangsu Province Special Equipment Safety Supervision Inspection Institute Branch of Xuzhou | Wang J.,Jiangsu Province Special Equipment Safety Supervision Inspection Institute Branch of Xuzhou | Jiang T.,Jiangsu Province Special Equipment Safety Supervision Inspection Institute Branch of Xuzhou
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

Through failure analysis for high strength bolt used for large crane, the fracture morphology, metallographic and spectral analysis were used for the broken bolt. The results show that the fracture of high strength bolt is due to the raw materials' inclusions in microstructure, the first cracking initiates at the thread root of stress concentration and propagates inward to a certain extent, then developes rapidly. The hardness test shows that the hardness difference between bolt surface and core becomes obvious.There is a carbon growth trend in surface, so it may be a cause for bolt breaking. Source

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