Influencing factors of powder flowability of rotational molding materials

doi:10.19491/j.issn.1001-9278.2022.08.015

Abstract

Abstract:

Based on the requirements of GB/T 40934—2021， the influencing factors for the powder flowability test of rotational molding materials were investigated， and the precision data and quality judgment criteria of powders for rotational molding were presented. The results indicated that the influencing factors for the sensitivity of powder fluidity test were obtained by an order of outlet diameter >> sample temperature = sampling amount ≈ moisture content > > state condition time. In these factors， the outlet diameter was the most important factor for the accuracy of test. The greater the value of powder fluidity， the stronger was the sensitivity to the change of test conditions， indicating an increase in the coefficient of variation. There was only a weak negative correlation between the apparent density and powder fluidity.

Key words: powder fluidity, rotational molding, test condition, precision

CLC Number:

TQ317.3

WEN Yuan, HUANG Ming, SHI Chuncai, YU Jianhai, LI Yanping, ZHANG Wei, MAO Xianpeng, XU Kejie, SUN Hongsuo. Influencing factors of powder flowability of rotational molding materials[J]. China Plastics, 2022, 36(8): 92-97.

Figures/Tables 13

References 14

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含水率/%	聚乙烯粉末粒径D₅₀
含水率/%	800 μm	400 μm	250 μm
0	15.0	19.5	21.1
0.5	17.2	19.9	20.1
2.5	22.2	—	23.8
5.0	33.4	—	22.9

含水率/%	聚乙烯粉末粒径D₅₀
含水率/%	800 μm	400 μm	250 μm
0	15.0	19.5	21.1
0.5	17.2	19.9	20.1
2.5	22.2	—	23.8
5.0	33.4	—	22.9

粉体温度/℃	样品1	样品2	样品3	样品4	样品5
变异系数	3.17 %	2.30 %	8.82 %	12.08 %	14.04 %
60	15.4	18.6	28.1	—	45.5
40	15.5	18.8	25.7	—	34.2
23	15.9	19.7	24.4	30.5	36.5
0	14.6	19.3	24.9	35.1	33.1
-20	15.1	19.3	22.0	38.9	33.7

粉体温度/℃	样品1	样品2	样品3	样品4	样品5
变异系数	3.17 %	2.30 %	8.82 %	12.08 %	14.04 %
60	15.4	18.6	28.1	—	45.5
40	15.5	18.8	25.7	—	34.2
23	15.9	19.7	24.4	30.5	36.5
0	14.6	19.3	24.9	35.1	33.1
-20	15.1	19.3	22.0	38.9	33.7

调节时间/h	样品1	样品2	样品3	样品4
变异系数	1.78 %	2.97 %	4.32 %	6.02 %
0	18.7	23.7	30.4	41.2
2	19.1	23.0	27.8	39.3
4	19.6	23.3	27.3	40.6
12	19.4	23.1	27.0	39.2
24	19.4	23.4	28.9	38.9
48	18.7	24.2	30.0	38.0
72	18.8	25.2	27.9	33.6