Effect of phosphate nucleating agents on crystallization and mechanical properties of coal⁃based impact⁃resistant copolymerization⁃type polypropylene K8708

doi:10.19491/j.issn.1001-9278.2025.01.004

Abstract

Abstract:

The effect of two types of phosphate ester hydroxyaluminum salt nucleating agents， NA⁃21 and TD⁃531， on the crystallization process of coal⁃based impact⁃resistant copolymerization⁃type polypropylene （PP） was investigated， realizing the regulation of the mechanical properties of the PP. The results indicated that both of the nucleating agents could act as α⁃Type nucleating agents for the PP to significantly increase its crystallization peak temperature and nucleation density， thus accelerating the overall crystallization rate of the PP and improving its rigidity and processing efficiency. TD⁃531 generated a more significant effect on improving the performance of the PP in contrast to NA⁃21. When the addition amount of TD⁃531 was only 0.075 %， the crystallization peak temperature of the PP increased to 131.8 ℃， its semi⁃crystallization time decreased to 0.35 min. Compared to those of pure PP， the crystallization peak temperature increase by 10 ℃ and the semi⁃crystallization time decreased by 5.48 min. Meanwhile， the flexural modulus and impact strength of the PP increased to 1 377 MPa and 68.9 kJ/m²， respectively， which were increased by 330 MPa and 22.3 kJ/m²， respectively， compared to those of pure PP. This demonstrated a good balance between the rigidity and toughness thanks to a good dispersion effectiveness of the nucleating agent.

Key words: phosphate nucleating agent, coal?based polypropylene, crystallization performance, mechanical property, rigidity and toughness balance

CLC Number:

TQ325.1⁺4

HUANG Qizhong. Effect of phosphate nucleating agents on crystallization and mechanical properties of coal⁃based impact⁃resistant copolymerization⁃type polypropylene K8708[J]. China Plastics, 2025, 39(1): 19-24.

Figures/Tables 12

References 15

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样品编号	1010抗氧剂含量	168抗氧剂含量	硬脂酸钙含量	TD⁃531成核剂含量	NA⁃21成核剂含量
样品1	0.04	0.08	0.04	0.050	-
样品2	0.04	0.08	0.04	0.075	-
样品3	0.04	0.08	0.04	0.100	-
样品4	0.04	0.08	0.04	0.150	-
样品5	0.04	0.08	0.04	0.200	-
样品6	0.04	0.08	0.04	-	0.050
样品7	0.04	0.08	0.04	-	0.075
样品8	0.04	0.08	0.04	-	0.100
样品9	0.04	0.08	0.04	-	0.150
样品10	0.04	0.08	0.04	-	0.200

样品编号	1010抗氧剂含量	168抗氧剂含量	硬脂酸钙含量	TD⁃531成核剂含量	NA⁃21成核剂含量
样品1	0.04	0.08	0.04	0.050	-
样品2	0.04	0.08	0.04	0.075	-
样品3	0.04	0.08	0.04	0.100	-
样品4	0.04	0.08	0.04	0.150	-
样品5	0.04	0.08	0.04	0.200	-
样品6	0.04	0.08	0.04	-	0.050
样品7	0.04	0.08	0.04	-	0.075
样品8	0.04	0.08	0.04	-	0.100
样品9	0.04	0.08	0.04	-	0.150
样品10	0.04	0.08	0.04	-	0.200

样品	成核剂浓度/%	结晶峰温度/℃	结晶起始温度/℃	结晶焓/ J·g^-1	结晶度/%
PP	—	121.9	125.7	60.9	29.6
TD⁃531/PP	0.050	130.7	134.1	86.6	42.0
	0.075	131.8	135.3	90.4	43.9
	0.100	131.7	135.1	88.6	43.0
	0.150	132.8	136.1	88.9	43.2
	0.200	132.8	136.3	93.0	45.1
NA⁃21/PP	0.050	128.9	131.9	93.8	45.5
	0.075	128.8	131.6	95.9	46.6
	0.100	129.0	132.4	94.3	45.8
	0.150	130.3	132.7	90.4	43.9
	0.200	129.3	131.9	85.7	41.6

样品	成核剂浓度/%	结晶峰温度/℃	结晶起始温度/℃	结晶焓/ J·g^-1	结晶度/%
PP	—	121.9	125.7	60.9	29.6
TD⁃531/PP	0.050	130.7	134.1	86.6	42.0
	0.075	131.8	135.3	90.4	43.9
	0.100	131.7	135.1	88.6	43.0
	0.150	132.8	136.1	88.9	43.2
	0.200	132.8	136.3	93.0	45.1
NA⁃21/PP	0.050	128.9	131.9	93.8	45.5
	0.075	128.8	131.6	95.9	46.6
	0.100	129.0	132.4	94.3	45.8
	0.150	130.3	132.7	90.4	43.9
	0.200	129.3	131.9	85.7	41.6

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