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以铬鞣革屑中提取的蛋白质对脲醛树脂进行改性,目的主要是为了提高,脲醛树脂的胶接强度、降低其生产成本及其游离甲醛含量。试验表明:当蛋白质提取液与脲醛树脂1∶1混合时,可以使其胶接强度达到最大值6.95MPa,而当蛋白质提取液的加入量为脲醛树脂的1.5倍时,游离甲醛含量为0.053%,远低于国家标准的要求(0.3%)和纯脲醛树脂中游离甲醛的含量(0.385%),而此时胶接强度也达到了国家标准的要求(1.9MPa)。
The purpose of modifying the urea-formaldehyde resin with the protein extracted from the chrome tanning shavings is to improve the bonding strength of the urea-formaldehyde resin, reduce the production cost and the content of the free formaldehyde. The results showed that when the protein extract was mixed with urea formaldehyde resin 1: 1, the bonding strength could reach the maximum of 6.95MPa. When the amount of protein extract was 1.5 times that of urea formaldehyde resin, the content of free formaldehyde was 0.053% , Much lower than the national standard (0.3%) and the content of free formaldehyde in pure urea formaldehyde resin (0.385%). At this time, the bonding strength also reached the national standard (1.9MPa).