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2022
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What are the characteristics of the material of the water seal of the hydraulic rock drill?
At present, the commonly used water sealing material is polyester polyurethane. This material is characterized by good physical and mechanical properties, but its hydrolytic stability is very poor. The reason is that water has a strong expansion and hydrolysis effect on this polyurethane. The so-called swelling effect refers to the formation of hydrogen bonds between the water and the polar groups in the polyurethane elastomer,
At present, the commonly used water sealing material is polyester polyurethane. This material is characterized by good physical and mechanical properties, but its hydrolytic stability is very poor. The reason is that water has a strong expansion and hydrolysis effect on this polyurethane. The so-called swelling effect refers to the formation of hydrogen bonds between the water and the polar groups in the polyurethane elastomer, which weakens the hydrogen bonds between the molecules of the elastomer itself, weakens the force between the polymer molecules, and reduces its physical and mechanical properties; The so-called hydrolysis is the chemical reaction between the water and the polar groups in the polyurethane elastomer, which destroys the structure of the elastomer. Thus, the more polar groups in the elastomer, the more polar it is, the worse its hydrolytic stability is. In contrast, the number of polar groups in polyether polyurethane elastomer is less, the polarity is weak, so its water is polyester type5-10However, due to the free rotation of ether bonds in the polyether polyurethane structure and the low cohesion energy, its mechanical properties are not as good as polyester polyurethane. Obviously, the two take advantage of the synthesis of a mixed polyurethane.--Polycaprolactone polyurethane, it not only has excellent mechanical properties, but also has good hydrolysis stability, and its water resistance index is higher than polyether polyurethane.2At the same time, in the actual rock drilling site, we have little selectivity for groundwater. Groundwater is not pure water, but has a certain acidity, salt, and sediment.…Therefore, in the water seal also need to add a variety of acid and alkali salt of other materials to be modified. Therefore, there are a few working conditions also use modified special rubber.
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