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Process performance based on the casting alcohol-based coating as the research object, based on the investigation of the effect of magnesium aluminum silicate, lithium base bentonite, phenolic resin, PVB and gas phase silicon dioxide coating component and refractory aggregate types and solid content on the properties of alcohol base coating. On this basis, formulate the orthogonal test of three factors and four levels. Through the orthogonal test and analysis, the optimum technological properties of the coatings formulation. Finally, the best coating field coating and casting, the use effect of coating production.
Study found that, compared with the lithium base bentonite prepared coating, prepared with magnesium aluminum silicate coatings with good suspension property, flow resistance, flow resistance and hardening process performance, especially the hardening performance. Small molecular weight polyvinyl butyral (PVB) than the large molecular weight increased in PVB suspension coating and leveling. At the same time, paint is still good suspension property and resistance to hardening. In a certain range, increase the solid content of coating to make the technological properties of the coatings are improved, especially the suspension. Solid content increased from 45% to 60%, 24 hour suspension can reach about 95%, rise compared to the same period 20%; suspended after 168 hours can reach about 90%. Fumed silica (white carbon black) can significantly improve the suspension coating.
Analysis of orthogonal test and range, suspending agent is the main impact of all the technological properties of the coatings. Dominates the various technological properties of the coatings, these properties including viscosity, suspension, leveling, yield value and flow resistance. With the increase of the content of suspending agent, the coating viscosity, suspension, yield value and flow resistance increases, and the leveling down, brushing resistance and flowability increases and then decreases. The best formula has the best technological properties of the coatings obtained by orthogonal experiment: suspending agent 1.2%, 1.2% phenolic resin, PVB0.3%, fumed silica 0.3% (both as a percentage of coating). With optimum properties of coatings in the production site cast iron castings, flow resistance, flow is fine, uniform coating, smooth surface, easy to peel, after casting off, easy to clean, clean up after the casting surface finish, completely avoid the phenomenon of adhering sand.
Keywords: alcohol radical coating; suspending agent; solid content; PVB; fumed silica; process performance
In 1789, American renowned statesman Benjamin Franklin\'s has said a famous saying: \"In the world only has two facts inevitably, one is the death, two is the tax revenue.\" Inheritance tax the product which unifies as the death and the tax revenue whether avoids, we are unknown. Although in 4600 before initiated the inheritance tax Egypt already to cancel the inheritance tax in 1989, but in the present world at least also has more than 70 countries and the area still is drafting the inheritance tax, therefore the inheritance tax destiny also was how difficult to expect. But reasonably adjusts the inheritance tax the policy, the making inheritance tax system, strengthens the inheritance tax management, enables it to display the special tax well the function, was already begins levying taxes with the preparation begins levying taxes the topic which the inheritance tax country and the area should care about.
摘 要 参考系是研究运动的基准,牛顿运动定律是建立在惯性参考系中的定律。凡是牛顿运动定律在其中能正确成立的参考系为惯性参考系。相对于惯性系作加速运动的系统,就是非惯性系。由于惯性力的引入,使牛顿运动定律的形式在非惯性系中得以沿用,这给许多力学问题的解决带来了很大的方便。通过对惯性系与非惯性系的讨论,以及对平动参考系和转动参考系的研究,阐述了牛顿定律不适合非惯性系的原因,以及非惯性系中的运动定律。并举例说明不同参考系下的同一运动,所得加速度可以不同。关键词 惯性系 非惯性系 惯性力 平动参考系 转动参考系 科里奥利力
Abstract
Frame of reference is the basis of motion study. Newton's laws of motion are established in the inertial frame of reference. Whatever frame in which Newton's laws of motion can be established falls in to the category of inertial frame. Compared with inertial frame as the frame of acceleration, there is non-inertial frame. Thanks to the introduction of inertial force, Newton's laws of motion have been adopted in the non-inertial frame, which greatly facilitates the solution to many issues of dynamics. Through the discussion of inertial frame and non-inertial frame, and the study of translational motion frame and rotating reference frame, this paper expounds the reasons why Newton's laws of motion is not applicable to non-inertial frame, and laws of motion in non-inertial frame. Besides, this thesis illustrates with examples the point that the same motion can have different accelerated velocity in different frames of reference.
Key words: inertial frame of reference; non-inertial frame; inertial force; translational motion frame; rotating reference frame; Coriolis force
inertial frame of reference惯性参考系
非惯性参考系non-inertial frame
rotating reference frame 转动参考系
translation; translational motion 平动
inertial force 惯性力
Coriolis force科里奥利力
Newton's laws of motion 牛顿运动定律
加速度accelerated speed; accelerated velocity; acceleration
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