摘要
提高CO2水玻璃砂粘结强度的关键在于抑制硬化过程中胶粒的过度长大,可行的途径是向水玻璃中引入能与水玻璃起作用并能阻抑胶粒长大,而且对CO2硬化不引起、或少引起负面影响的物质。选择了含有—COONa极性基的有机合成物为1#改性树脂;含有HO■CH2OH极性基的有机合成物为2#改性树脂,含有—CONH2极性基的有机物为3#改性树脂,作为改性剂的主干材料对水玻璃进行改性处理。试验结果表明,改性水玻璃尤其是1#改性树脂改性水玻璃18#与普通水玻璃相比,明显提高常温下的粘结强度;显著改善热强度和高温强度;消除了800℃时的残留强度峰值。
The key to improve the bond strength of CO2-cured sodium silicate bonded sand mold is to restrict the growth of particles in the curing sodium silicate process, and the feasible way is to introduce a material, which can hinder the particle growth and has little or less negative influence on CO2-cured process, into the sodium silicate. Three polar organic compounds, containing --COONa,HO CONH2 and-CONH2, respectively, were chosen as 1^#, 2^# and 3^# modified resins, respectively, which are the main materials of the modifiers to modify the sodium silicate. The experimental results show that for the sand molds bonded by the modified sodium silicates, particularly for the sand mold bonded by the 18^# sodium silicate modified by 1^# modified resin, the bond strength at room temperature is increased markedly as compared to ordinary sodium silicate, the thermal strength and high temperature strength are improved greatly, and the peak residual strength at 800 ℃ is eliminated.
出处
《铸造》
CAS
CSCD
北大核心
2008年第7期717-721,共5页
Foundry
关键词
CO2硬化
水玻璃
改性
C02-cured
sodium silicate
modification
