Preparation and properties of TiO2⁃whitening PA6/GF composites with excellent mechanical performance

doi:10.19491/j.issn.1001-9278.2025.03.003

Abstract

Abstract:

In this article， TiO₂ was surface modified by macromolecular polybasic acid （BA） and lauric acid （LA） and then used to whiten the PA6/GF composites through extrusion molding. The effect of modified TiO₂ on the crystallization behavior and interfacial and mechanical properties of the composites were investigated. The results indicated that there was no significant influence on the improvement of mechanical properties of PA6/GF composites at an LA⁃modified TiO₂ content of 3 wt.%. However， the composites with BA⁃modified TiO₂ obtained tensile strength， flexural strength and notched impact strength of 109 MPa， 155 MPa， and 12.3 kJ/m²， respectively， which were higher than those of the composites with pure TiO₂ by 11.1 %， 10.7 %， and 68.5 %， respectively. All parameters reached 85 % or more of the results for the composite systems with the same amount of ZnS.

Key words: polyamide 6, glass fiber, titanium oxide, surface modification, impact strength

CLC Number:

TQ323.6

ZHANG Heng, LIU Hao, QIU Shouji, ZHANG Bing, WU Shuqing. Preparation and properties of TiO₂⁃whitening PA6/GF composites with excellent mechanical performance[J]. China Plastics, 2025, 39(3): 12-18.

Figures/Tables 11

References 20

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颜料名称	折射率	消色力
颜料名称	折射率	雷诺数	相对值
钛白粉（金红石型）	2.76	1 650	100
钛白粉（锐钛型）	2.55	1 270	77
硫化锌（ZnS）	2.37	660	40
钡白（BaSO₄）	1.64	-	-
锑白（Sb₂O₃）	2.09	280	17
锌白（ZnO）	2.02	200	12
锌钡白（立德粉）	1.84	260	16

颜料名称	折射率	消色力
颜料名称	折射率	雷诺数	相对值
钛白粉（金红石型）	2.76	1 650	100
钛白粉（锐钛型）	2.55	1 270	77
硫化锌（ZnS）	2.37	660	40
钡白（BaSO₄）	1.64	-	-
锑白（Sb₂O₃）	2.09	280	17
锌白（ZnO）	2.02	200	12
锌钡白（立德粉）	1.84	260	16

样品	Ф/℃·min^-1	T₀/℃	T_p/℃	t_1/2/ min	G/ min^-1
PA6/GF	5	191.8	188.2	2.35	0.42
	10	186.0	181.8	1.29	0.77
	15	182.5	178.0	0.91	1.10
	20	181.9	175.1	0.81	1.24
	30	175.2	170.8	0.60	1.67
PA6/GF/TiO₂	5	194.3	191.3	1.55	0.65
	10	190.1	186.1	0.82	1.22
	15	187.4	182.5	0.68	1.47
	20	185.1	179.2	0.47	2.13
	30	181.9	175.4	0.37	2.70
PA6/GF/LA⁃TiO₂	5	193.6	190.6	1.75	0.57
	10	189.2	185.3	1.05	0.95
	15	186.4	181.6	0.76	1.32
	20	184.2	178.8	0.63	1.59
	30	180.8	174.3	0.52	1.92
PA6/GF/BA⁃TiO₂	5	192.2	189.1	1.92	0.52
	10	186.1	182.0	1.18	0.85
	15	182.4	177.4	0.91	1.10
	20	179.8	174	0.77	1.30
	30	176.2	169.2	0.57	1.75

样品	Ф/℃·min^-1	T₀/℃	T_p/℃	t_1/2/ min	G/ min^-1
PA6/GF	5	191.8	188.2	2.35	0.42
	10	186.0	181.8	1.29	0.77
	15	182.5	178.0	0.91	1.10
	20	181.9	175.1	0.81	1.24
	30	175.2	170.8	0.60	1.67
PA6/GF/TiO₂	5	194.3	191.3	1.55	0.65
	10	190.1	186.1	0.82	1.22
	15	187.4	182.5	0.68	1.47
	20	185.1	179.2	0.47	2.13
	30	181.9	175.4	0.37	2.70
PA6/GF/LA⁃TiO₂	5	193.6	190.6	1.75	0.57
	10	189.2	185.3	1.05	0.95
	15	186.4	181.6	0.76	1.32
	20	184.2	178.8	0.63	1.59
	30	180.8	174.3	0.52	1.92
PA6/GF/BA⁃TiO₂	5	192.2	189.1	1.92	0.52
	10	186.1	182.0	1.18	0.85
	15	182.4	177.4	0.91	1.10
	20	179.8	174	0.77	1.30
	30	176.2	169.2	0.57	1.75

样品	拉伸强度/MPa	断裂伸长率/%	弯曲强度/MPa	弯曲模量/MPa	缺口冲击强度/kJ·m^-2	白度
PA6/GF	120±2	9.6±0.9	168±3	5 677±109	15.1±0.6	56.1±0.3
PA6/GF/ZnS	128±3	8.3±0.2	176±3	6 374±248	14.4±0.3	92.1±0.1
PA6/GF/TiO₂	99±0	7.9±0.4	140±3	4 982±103	7.3±0.2	93.3±0.2
PA6/GF/LA⁃TiO₂	99±1	7.9±0.3	142±2	4 990±110	7.2±0.4	94.3±0.1
PA6/GF/BA⁃TiO₂	110±2	8.5±0.4	155±2	5 997±91	12.3±0.5	94.2±0.2

Preparation and properties of TiO₂⁃whitening PA6/GF composites with excellent mechanical performance

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