Study on preparation and insect resistance property of garlic stem and leaf based acrylate liquid mulch film

doi:10.19491/j.issn.1001-9278.2024.08.006

Abstract

Abstract:

In this study， the sprayable garlic stem and leaf waste （GL）⁃acrylate liquid mulch film with anti⁃insect function was prepared by emulsion polymerization of GL and acrylic monomer， where GL was fully utilized. The effects of GL usage on emulsion viscosity， sprayability， wicking property and film formation were studied， and the mechanical properties， water retention and thermal insulation properties of GL⁃acrylate films were also evaluated. The structures of GL⁃acrylate films were characterized by scanning electron microscopy， infrared spectroscopy and thermogravimetric analysis. The biodegradability and pests resistance of GL⁃acrylate film were evaluated. The experimental results indicated that when the mass ratio of GL to acrylate monomer was 0.5/10， GL⁃acrylate emulsion had good film⁃forming and sprayability， and the GL⁃acrylate film had good mechanical properties， the minimum soil water evaporation rate （19.7 %） and the best soil heat preservation ability， which could increase the germination rate of pakchoi seeds by 20 %. At the same time， it reduced the area of leaf damage by 12 % and the survival rate of plutella xylostella pests by 20 %.

Key words: garlic stem and leaf waste, acrylic monomer, sprayable liquid mulch film, pest resisitance

CLC Number:

TQ321

LI Bo, MA Jun, LI Wenzhuo. Study on preparation and insect resistance property of garlic stem and leaf based acrylate liquid mulch film[J]. China Plastics, 2024, 38(8): 33-39.

Figures/Tables 15

样品编号	GL/g	单体/g	GL/单体质量比	乳化剂/g	引发剂/g
1^#	0.3	10	0.3/10	1.5	0.4
2^#	0.5	10	0.5/10	1.5	0.4
3^#	1.0	10	1/10	1.5	0.4
4^#	1.5	10	1.5/10	1.5	0.4
5^#	2.0	10	2/10	1.5	0.4

Tab.1. Formual of sample 1#~5#

样品	GL/单体质量比	黏度/mPa·s	可喷涂性	Wicking深度/cm
1^#	3/100	260	√	1.5
2^#	5/100	293	√	0.8
3^#	10/100	346	√	0.6
4^#	15/100	678	√	0.3
5^#	20/100	1242	×	—

Tab.2. Viscosity， sprayability and wicking depth of sample 1#~5# emulsion

Fig.1. Penetration depth of sample 1#~5# emulsions under soil

Fig.2. Membranes formed by sample 1#~5# on the soil surface

样品	GL/g	GL/单体质量比	拉伸强度/MPa	弹性模量/MPa	断裂伸长率/%
1^#	0.3	0.3/10	10.20±0.13	1.42±0.42	306.2±14.6
2^#	0.5	0.5/10	14.31±0.59	1.75±0.86	469.1±23.1
3^#	1.0	1/10	17.27±0.49	2.31±0.73	321.6±27.8
4^#	1.5	1.5/10	20.14±0.21	2.84±0.45	210.7±21.4
5^#	2.0	2/10	21.06±0.47	3.13±0.21	151.5±12.3

Tab.3. Mechanical properties of sample 1#~5# films

Fig.3. Water evaporation rate of the bare soil and the soil covered with sample 1#~4# films

Fig.4. Effects of sample films on the temperature of soil at different depth

Fig.5. FTIR spectra of GL⁃acrylic and acrylic

Fig.6. SEM images of the surface of bare soil particle and soil covered with sample 2# film

Fig.7. TG and DTG curves of the sample 2# film

Fig.8. Degradation rate of the sample 2# and PE⁃LD films

Fig.9. Germination and growth of the pakchoi under different GL⁃acrylate emulsion usage

处理方式	GL⁃丙烯酸酯乳液使用量/kg·m^-2	发芽率/%
GL⁃丙烯酸酯地膜1^#	0.58	87
GL⁃丙烯酸酯地膜2^#	0.80	72
裸土	0	59

Tab.4. Germination rate of the pakchoi seeds 5 days after sowing under different GL⁃acrylate emulsion usage

Fig.10. Effects of sample 2# and bare soil on the leaf damage of pakchoi seedlings and the survival rate of Plutella xylostella larvae

Fig.11. Photographs of pakchoi seedlings and Plutella xylostella larvae after 5 days in pots covered with sample 2# and bare soil， respectively

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