Effect of particle size distribution of polyethylene powders on melt mass⁃flow rate

doi:10.19491/j.issn.1001-9278.2023.01.005

Abstract

Abstract:

Four types of polyethylene powders prepared by using different production processes were selected to prepare the polyethylene powders with different particle size ranges using vibrating screen machine equipped with different pore size screens. The melt mass⁃flow rate （MFR） of these powders was measured by melt index instrument， and the difference of the MFR of polyethylene powders in different particle size ranges and the relationship between the MFR and particle size distribution of polyethylene powders were investigated. The relationship between the repeatability of MFR test results and particle size distribution of the powders was analyzed. A method for reducing the test errors of MFR in the test process was proposed， which provided guidance for the measurement of the MFR of the powders. The results indicated that the particle size distribution of polyethylene powders had a great influence on MFR. The repeatability of MFR can be improved by pretreatment and regular sampling.

Key words: polyethylene, powder, particle size distribution, pelt mass flow rate

CLC Number:

TQ325.1⁺2

Cite this article

LI Shouchao, FANG Yingchun, TANG Xinqiang. Effect of particle size distribution of polyethylene powders on melt mass⁃flow rate[J]. China Plastics, 2023, 37(1): 26-30.

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URL: https://www.plaschina.com.cn/EN/10.19491/j.issn.1001-9278.2023.01.005

https://www.plaschina.com.cn/EN/Y2023/V37/I1/26

Figures/Tables 10

装置名称	样品编号	MFR/g·（10 min）^-1	测试温度/℃	测试负荷/kg	测试口模
全密度聚乙烯装置	1^#试样	1.7~2.3	190	2.16	标准口模，内径为2.095 mm
全密度聚乙烯装置	2^#试样	6.0~8.5	190	2.16
高密度聚乙烯装置	3^#试样	5.5~9.5	190	2.16
高密度聚乙烯装置	4^#试样	0.20~0.26	190	5.0

装置名称	样品编号	MFR/g·（10 min）^-1	测试温度/℃	测试负荷/kg	测试口模
全密度聚乙烯装置	1^#试样	1.7~2.3	190	2.16	标准口模，内径为2.095 mm
全密度聚乙烯装置	2^#试样	6.0~8.5	190	2.16
高密度聚乙烯装置	3^#试样	5.5~9.5	190	2.16
高密度聚乙烯装置	4^#试样	0.20~0.26	190	5.0

Tab.1. Polyethylene powder test sample，quality index and test conditions

粒径分布/μm	所占比例/%	MFR/g·（10 min）^-1
>2 000	0	—
2 000~1 000	8.38	2.16
1 000~500	28.91	2.09
500~250	30.66	1.91
250~125	25.74	1.64
125~75	5.89	1.50
<75	0.42	1.42
混合样品	—	1.93

粒径分布/μm	所占比例/%	MFR/g·（10 min）^-1
>2 000	0	—
2 000~1 000	8.38	2.16
1 000~500	28.91	2.09
500~250	30.66	1.91
250~125	25.74	1.64
125~75	5.89	1.50
<75	0.42	1.42
混合样品	—	1.93

Tab.2. The particle size distribution and MFR of 1 # sample powder before and after sieving

Fig.1. The relationship between particle size distribution and MFR of 1# sample powder

粒径分布/μm	所占比例/%	MFR/g·（10 min）^-1
>2 000	14.91	8.36
2 000~1 000	27.75	7.81
1 000~500	29.93	6.86
500~250	18.96	6.34
250~125	6.24	5.47
125~75	1.56	4.89
<75	0.57	4.23
混合样品	—	6.91

粒径分布/μm	所占比例/%	MFR/g·（10 min）^-1
>2 000	14.91	8.36
2 000~1 000	27.75	7.81
1 000~500	29.93	6.86
500~250	18.96	6.34
250~125	6.24	5.47
125~75	1.56	4.89
<75	0.57	4.23
混合样品	—	6.91

Tab.3. The particle size distribution of 2 # sample powder after sieving was compared with that of MFR

Fig.2. The relationship between particle size distribution and MFR of 2 # sample powder

粒径分布/μm	所占比例/%	MFR/g·（10 min）^-1
>500	4.16	7.21
500~300	10.24	7.16
300~250	16.41	7.09
250~200	25.64	6.99
200~160	22.40	6.88
160~100	17.05	6.79
100~63	3.35	6.71
63~32	0.79	6.68
<32	0	—
混合样品	—	6.96

粒径分布/μm	所占比例/%	MFR/g·（10 min）^-1
>500	4.16	7.21
500~300	10.24	7.16
300~250	16.41	7.09
250~200	25.64	6.99
200~160	22.40	6.88
160~100	17.05	6.79
100~63	3.35	6.71
63~32	0.79	6.68
<32	0	—
混合样品	—	6.96

Tab.4. The particle size distribution of 3 # sample powder after sieving was compared with that of MFR

Fig.3. The relationship between particle size distribution and MFR of 3# sample powder

粒径分布/μm	所占比例/%	MFR/g·（10 min）^-1
>500	5.67	0.14
500~300	13.19	0.42
300~250	18.47	0.45
250~200	32.65	0.38
200~160	20.26	0.35
160~100	7.74	0.31
100~63	1.71	0.30
63~32	0.28	0.28
<32	0.03	—
混合样品	—	0.31

粒径分布/μm	所占比例/%	MFR/g·（10 min）^-1
>500	5.67	0.14
500~300	13.19	0.42
300~250	18.47	0.45
250~200	32.65	0.38
200~160	20.26	0.35
160~100	7.74	0.31
100~63	1.71	0.30
63~32	0.28	0.28
<32	0.03	—
混合样品	—	0.31

Tab.5. The particle size distribution and MFR of 4# sample powder before and after sieving

Fig.4. The relationship between particle size distribution and MFR of 4 # sample powder

样品	样品状态	第1次/ g·（10 min）^-1	第2次/ g·（10 min）^-1	第3次/ g·（10 min）^-1	第4次/ g·（10 min）^-1	第5次/ g·（10 min）^-1	第6次/ g·（10 min）^-1	极差	变异系数/ %
1^#试样	未混匀	1.99	2.04	1.96	2.07	1.89	1.86	0.21	4.18
1^#试样	混匀	1.92	1.94	1.89	1.90	1.88	1.92	0.06	1.17
2^#试样	未混匀	7.50	7.28	6.86	7.05	6.92	6.62	0.88	4.46
2^#试样	混匀	6.91	6.98	6.81	7.08	6.89	6.94	0.27	1.31
3^#试样	未混匀	7.03	7.18	6.95	7.15	6.79	6.86	0.39	2.23
3^#试样	混匀	6.92	6.94	6.89	7.10	7.06	6.93	0.21	1.22
4^#试样	未混匀	0.29	0.30	0.26	0.28	0.27	0.25	0.05	6.80
4^#试样	混匀	0.27	0.28	0.27	0.26	0.25	0.27	0.03	3.87

样品	样品状态	第1次/ g·（10 min）^-1	第2次/ g·（10 min）^-1	第3次/ g·（10 min）^-1	第4次/ g·（10 min）^-1	第5次/ g·（10 min）^-1	第6次/ g·（10 min）^-1	极差	变异系数/ %
1^#试样	未混匀	1.99	2.04	1.96	2.07	1.89	1.86	0.21	4.18
1^#试样	混匀	1.92	1.94	1.89	1.90	1.88	1.92	0.06	1.17
2^#试样	未混匀	7.50	7.28	6.86	7.05	6.92	6.62	0.88	4.46
2^#试样	混匀	6.91	6.98	6.81	7.08	6.89	6.94	0.27	1.31
3^#试样	未混匀	7.03	7.18	6.95	7.15	6.79	6.86	0.39	2.23
3^#试样	混匀	6.92	6.94	6.89	7.10	7.06	6.93	0.21	1.22
4^#试样	未混匀	0.29	0.30	0.26	0.28	0.27	0.25	0.05	6.80
4^#试样	混匀	0.27	0.28	0.27	0.26	0.25	0.27	0.03	3.87

Tab.6. Repeated determination results of polyethylene powder samples in two states

References 4

1	陈宏愿，陈敏剑，任雨峰，等. 塑料热塑性塑料熔体质量流动速率（MFR）和熔体体积流动速率（MVR）的测定第1部分：标准方法：［S］.北京：中国标准出版社，2018.3.
2	李守超，房迎春，黄莉，等. 聚乙烯树脂粉料粒度分布测定筛分法： Q/ ［S］. 独山子：独山子石化公司，2020⁃12⁃25.
3	宋宪宝.Unipol低压气相法聚乙烯合成工艺进展［J］.辽宁化工，1991（6）：21.
4	朴龙焕，王雪飞，巩传志，等.高密度聚乙烯装置总体设计：A121004590［Z］.吉林设计院，2018⁃10.

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