分散剂对玻璃纤维浆料分散性的影响

Effect of Dispersant on Dispersion of Glass Fiber Suspension

研究了切棉方式、玻璃纤维长度、分散剂种类和含量对玻璃纤维浆料分散性的影响.结果表明：切棉后的浆料分散程度明显高于未切棉的;浆料中所含纤维成团所占面积百分数由72.6％降到2.4％.长方形棉块经打浆后形成的浆料纤维较正方形的更为分散.玻璃纤维越长则越难分散,适宜的纤维分散长度为10～12 mm.浆料所含纤维为0.2wt％时,羟乙基纤维素、羟丙基甲基纤维素、六偏磷酸钠的最佳加入量分别为0.008wt％、0.012wt％和0.04wt％,所对应的浆料吸光度分别为0.344、0.703和0.663 A.沉降实验显示添加六偏磷酸钠的浆料分散性最好,浆料沉降高度最低、沉降速率最慢,羟丙基甲基纤维素次之,羟乙基纤维素最差.

The effect of the way of cut fiber, glass fiber length, the type and amount of dispersants on dispersion of glass fiber suspension was investigated. The results showed that the dispersion degree of glass fiber after cutting is significantly higher than that of glass fiber before cutting. The percentages of fiber mass area in the suspension before and after cutting are 72.6% and 2.4%, respectively. The dispersion of rectangular cotton-block after beating is bet- ter than that of the square cotton-block. The longer glass-fiber length or the higher reunite phenomenon, the more dif- ficult dispersion of the glass fiber suspension. The appropriate length of glass fiber, about 10 ~ 12 mm, is helpful to the dispersion of the suspension. When the mass fraction of the suspension is up to 0.2%, the optimum addition a- mounts of hydroxyethyl cellulose, hydroxypropyl methyl cellulose and sodium hexametaphosphate are 0. 008%, 0. 012% and 0.04%, respectively. Correspondingly, the absorbances of glass fiber suspension under the optimal mass fraction of three types of dispersants are 0. 344, 0. 703 and 0. 663 A, respectively. The sedimentation experi- ment showed that the glass fiber suspension added the sodium hexametaphosphate had the best dispersion, the mini- mum suspension sedimentation height and the slowest sedimentation rate. The dispersion of the glass fiber suspension added hydroxypropyl methyl cellulose is better than that of the glass fiber suspension added hydroxyethyl cellulose.