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1.
Full composition analysis idea
2.
Qualitative analysis of material principal components
First of all, we need to analyze the main components of degradable plastic bags, which can be directly analyzed by infrared analysis
.
Figure 1 The original infrared spectrum of the sample
It can be seen from Figure 1 that: at 1713 cm-1 is the C=O contraction vibration peak, the strong peak at 1021-1270 cm-1 is the stretching vibration peak of the COC group, and the moderate intensity absorption peak at 1500-1456 cm-1 It is -CH3 antisymmetric, 2957 cm-1 is the absorption peak of saturated hydrocarbon, 875 cm-1 benzene ring CH in-plane deformation, 730 cm-1 para-substituted benzene ring = CH out-plane deformation, the above functional groups show the main The ingredient is polybutylene adipate/terephthalate (PBAT)
.
PBAT is a copolymer of butylene glycol oxalate and butylene terephthalate
.
3.
Analysis and quantification of extract components
The following figure is the infrared spectrum of the solvent A extract, the main component is glycerol
.
Fig.
2 The infrared spectrum and matching infrared image of the extract
The following figure is the GC-MS spectrum of solvent A extract, the main components are glycerol (plasticizer), fatty acid ester, stearic acid, palmitic acid and oleic acid amide (lubricant)
.
Figure 3 Gas chromatogram of the extract
4.
Qualitative and quantitative analysis of polymers and fillers
Fig.
4 is the infrared spectrum of solvent 2 to extract the residue or dissolve the centrifugal precipitate.
The peak at 3423 cm-1 is strong and broad, mainly from the OH stretching vibration of the hydroxyl group
.
structure of starch
Fig.
4 The residue of soti is mainly starch
Figure 5 is the infrared spectrum of the ash content of the sample, combined with the results of ICP Ca, Si, Ti elements, mainly containing calcium carbonate (1453 cm-1.
873 cm-1, 712 cm-1), silicon dioxide (1100 cm-1) and titanium dioxide
.
Figure 5 Ash infrared spectrum
Figure 6 is the TGA diagram of the sample in nitrogen atmosphere.
The TGA is mainly divided into 3 sections.
The first section is the weight loss of plasticizer glycerin, the proportion is 5%, the second section 22% weight loss comes from starch, and the third section is weight loss Mainly from PBAT, the ash content of muffle furnace calcination is 0.
4%
.
Figure 6 TGA diagram of the sample - nitrogen
5.
The formula of degradable plastic bags in the market
The formula of degradable plastic bags in the market
Combined with the comprehensive analysis of infrared, Soti, ICP, GC-MS, high temperature calcination, TGA, etc.
, it can be seen that the formula components of the market degradable plastic bags purchased in this example are as follows:
The chain segment of polybutylene adipate/terephthalate (PBAT) containing PBT is shown in the figure below.
In order to further improve its degradability, many researchers and enterprises are also making PBAT composite materials, among which PBAT The compound with polylactic acid (PLA) is the most common, polylactic acid 10-50 parts, PBAT 10-50 parts, starch 0-50 parts, polycaprolactone (PCL) as compatibilizer 0.
04-2.
5, lubricant 0-3 parts, antioxidants 0-3 parts, fillers 1-50 parts
.
