摘要
水玻璃砂用有机酯硬化时，应“适度反应、强力脱水”。反应率不宜使水玻璃的模数〉4，但反应也是促进脱水的动力，不能过低，所以要适度。水玻璃在硬化过程中的脱水可划分为反应脱水、化学物理脱水和挥发脱水三个阶段。反应脱水约3％，化学物理脱水和挥发脱水的任务约35％。余水达到20％左右即可进行浇注。若〈20％即认为硬透性好。因此化学物理脱水率／反应率的比值对有机酯的硬化速度、硬透性和硬化强度有决定性影响。列举了有机酯的化学结构和物理-化学性质，以及无盐水玻璃对上述比值的影响。
When organic ester which is used as waterglass hardner must have suitable degree reaction and strong dehydration. The reaction degree can＇t push the modulus number of waterglass up to 4. But the chemical reaction also carries out dehydration at same time, hence the too low reaction degree is unacceptable, better at a suitable level. The dehydration process of waterglass sand may be divided into reaction dehydration, chemino-physics dehydration and evaporation dehydration three steps. The reaction dehydration is about 3%. When water content decreases from 58% to about 20%, the duty of dehydration of chemino-physics and evaporation is about 35%. If the residual water content is less than 20%, the harden-completivity is said to be high. Hence the ratio between chemino-physics dehydration / reaction degree plays a very import rule to the hardening velocity, hardening completivity and hardening strength. A lot of examples has been illustrated to describe the influences of chemical structures and chemino-physical properties and the saltless waterglass to above ratio.
出处
《铸造工程》
2008年第1期3-6,共4页
Foundry Engineering
关键词
水玻璃砂
硬化
有机酯
Waterglass sand
Hardening
Organic esters
