论文部分内容阅读
水玻璃基础理论研究的进展，为解决水玻璃砂扩大应用的3个障碍提供了有力的指导：①研究和分析测定了水玻璃砂中硅酸聚合的全过程、族组成和基本成分。从Na+对硅凝胶结构和强度的影响证明了合适的硬化工艺应是“强脱水，少反应”；②水玻璃的改性、复合和硬化工艺的改进改善了水玻璃砂溃散性。测定了改性剂和复合剂的选用原则和作用机理，从而有可能使水玻璃的加入量降低到相当于2．0％的水平，溃散性问题便迎刃而解：③水玻璃砂用CO2或有机酯硬化时，生成的是失水高模数水玻璃，所以残留水玻璃的一部分具有可逆性，能因复碱复水而回复到液态，由此创造了“水玻璃旧砂的化学再生法”，与物理再生配合，可克服旧砂再生的困难。为适应21世纪生产的特点，水玻璃砂技术将在多个方向往多样化开拓，从而使水玻璃砂的理论和应用迅速扩展，通过实例分析可以看到，在若干年后可能得出较为完整的理论体系和工艺方案，使水玻璃砂的比粘结强度、溃散性和旧砂回用率达到或接近树脂砂的水平。
The progress of the basic theory of water glass provides a powerful guide to solve the three obstacles to expand the application of water glass. (1) The whole process, composition and basic composition of silicic acid polymerization in sodium silicate sand are studied and analyzed. The effect of Na + on the structure and strength of the silicone gel proves that the proper hardening process should be “strong dehydration and less reaction”; ② the modification of water glass, the improvement of compounding and hardening process, improve the water glass sand collapsibility. Determining the selection principle and mechanism of the modifier and the compounding agent, it is possible to reduce the amount of water glass to the level of 2.0%, and the problem of collapsibility will be solved easily: ③ The sodium silicate with CO2 or organic ester When hardened, a water-loss high modulus water glass is generated, so that part of the residual water glass is reversible and can be recovered to a liquid state by the rehydration of a complex alkali, thereby creating a “chemical regeneration method of old glass of water glass” With the physical regeneration with the old sand can overcome the difficulties of regeneration. In order to adapt to the characteristics of the 21st century production, sodium silicate sand technology will be diversified in many directions to open up, so that the rapid expansion of the theory and application of sodium silicate sand, through example analysis can be seen in a number of years may be more complete The theoretical system and process plan, so that the specific binding strength of sodium silicate, collapsibility and the recovery rate of used sand at or near the level of resin sand.