Effect of air pollutants NOx on plastic packaging materials for liquor

doi:10.19491/j.issn.1001-9278.2022.03.020

Abstract

Abstract:

Based on the yellowing phenomenon caused by the NO_x gas emission of gasoline?loading cars in the storage process of plastic packaging products for liquor， the different types of liquor packaging products in high concentration of NO_x environment yellow change， corrosion resistance and thermal stability were investigated through the construction of artificial environment. This can ensure the normal use of high?class liquor packaging materials without any failures during storage and also avoid loopholes in anti?counterfeiting. The results indicated that the vacuum coated parts of gilded cellulose acetate （CA） and acrylonitrile butadiene styrene copolymer lost their metal color under the atmosphere of ultra?high concentration of NO_x（2 480 mg/L）. This resulted in a failure to distinguish the key anti?counterfeiting marks on the package and affected the anti?counterfeiting effect of the package. The design service life of CA parts and polyamide （PA） woven bags was shortened after the NO_x test. The surface coating of metallized packaging products， bronzing film and other products was thickened appropriately， and the stabilizer was increased appropriately. This prolonged the stabilization period of the products to a certain extent. After eroded by NO_x， the CA and PA woven bags were dissolved or degraded by NO_x， the blue parts and the bronzing parts faded， the polypropylene parts became brittle， and the polymethylmethacrylate parts cracked.

Key words: plastic packaging material, nitrogen oxide, bronzing, vacuum metalizing, gas fade, corrosion resistance

CLC Number:

TQ322.2

ZENG Congqin, PAN Wei, ZOU Yaobang. Effect of air pollutants NO_x on plastic packaging materials for liquor[J]. China Plastics, 2022, 36(3): 127-133.

Figures/Tables 11

Fig.1. Reaction of phenolic antioxidants with quinol type structure under NOx

Fig.2. Pictures of plastic packaging parts of Baijiu

NO_x浓度/mg·L^-1	测试时长/d	喷涂道数	测试前后黄色指数变化	NO_x吸附量/mmol·L^-1	pH值
2.25	2	1	4.38	0.03	4.6
		2	0.12	—	—
		3	-1.64
		4	0.12
		5	-0.01
201	9	1	48.15	0.16	3.0
		2	37.67	—	—
		3	31.53
		4	10.31
		5	-0.23

Tab.1. Color change and NOx adsorption amount of ABS part

Fig.3. FTIR spectra of the surface layer of the ABS part before and after exposed to NOx

Fig.4. NOx corrosion of vacuum coating parts

Fig.5. NOx test results of CA sheet after bronzing

Fig.6. Discoloration of silicone rubber exposed to NOx

Fig.7. Golden fabric bag exposed to NOx

Fig.8. The color change of PE closure with the duration of the NOx test

Fig.9. NOx test of PMMA part

Fig.10. TG curves of the PMMA

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