Preparation and Properties of Polyethylene/Hydrotalcite Thermal Insulation Composite Films

doi:10.19491/j.issn.1001-9278.2021.09.008

Abstract

Abstract:

Polyethylene （PE）/hydrotalcites （LDH） composite films were prepared through extrusion blow molding using three types of LDH， including the domestic products A and B， and imported product C. The effects of three types of LDH on the structure， heat preservation， mechanical properties， light transmittance， hydrophobicity， moisture retention and thermal properties of the composite films were investigated comparatively. When 8 % LDH were incorporated， the infrared absorbance integral area of the composite films increases by 183 % for the product A， 177 % for the product B and 77.1 % for the product C compared to pristine PE film. Mechanical analysis indicated that the composite films containing the domestic LDH achieved much better tensile strength and elongation at break and tended to be isotropic. All of the composite films presented the light transmittance higher than 89 %， and the haze of the composite films containing the imported LDH was smallest. Furthermore， there are no significant difference between the hydrophobicity and thermal properties of three types of composite films. Performance investigation indicated that the advantages of the imported LDH did not have outstanding comprehensive performance compared to the domestic ones. However， the domestic LDH are more cost?effective.

Key words: layered double hydroxide, polyethylene film, heat preservation, moisture retention, mechanical property

CLC Number:

TQ325.1⁺2

JIA Xianfei, ZHANG Kun, MI Qinghua, ZHU Xingkui, XU Jing. Preparation and Properties of Polyethylene/Hydrotalcite Thermal Insulation Composite Films[J]. China Plastics, 2021, 35(9): 46-54.

Figures/Tables 14

Fig.1. FTIR and XRD curves of LDH

Fig.2. SEM of LDH

Fig.3. SEM of pristine PE film and PE/LDH?B composite films

Fig.4. XRD curves of PE/LDH films

Fig.5. Transmittance and haze of pristine PE film and PE/LDH composite films

Fig.6. Contact angle of pristine PE film and PE/LDH composite film

Fig.7. Tensile strength and elongation at break of pristine PE film and PE/LDH composite films

Fig.8. WVT of pristine PE film and PE/LDH composite films

Fig.9. FTIR of pristine PE film and PE/LDH composite films

Fig.10. Absorbance area of pristine PE film and PE/LDH composite films in the range of 1 428.6~714.3 cm-1

型号	含量/%	吸光度面积
LDH?A	1	77
	2	78
	4	101
	8	198
LDH?B	1	71
	2	75
	4	94
	8	194
LDH?C	1	71
	2	90
	4	119
	8	124

Tab.1. Absorbance area of PE/LDH composite films in the range of 1 428.6~714.3 cm-1

Fig.11. TG curves of pristine PE film and PE/LDH composite films

样品	含量/ %	T_{10 %}/ ℃	T_{50 %}/ ℃	T_max/℃	800 ℃ 残炭率/%
纯PE		376.4	437.3	466.8	0
LDH?A	1	380.9	446.4	477.0	0.2
	2	395.0	462.9	483.1	2.1
	4	397.4	456.3	479.0	2.9
	8	400.8	459.1	482.3	3.5
LDH?B	1	392.6	450.1	477.3	0.3
	2	392.2	461.1	479.1	0.4
	4	381.1	462.8	482.3	1.5
	8	410.2	465.8	487.8	3.4
LDH?C	1	388.9	455.8	480.1	1.0
	2	385.7	458.6	485.3	1.3
	4	393.7	455.4	487.1	1.4
	8	396.0	477.1	490.4	3.5

Tab.2. TG data of pristine PE film and PE/LDH composite films

Fig.12. DSC curves of pristine film and PE/LDH composite films

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