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Multi-stage modified thermoplastic starch master batch and application thereof in preparation of starch-based biodegradable film
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A thermoplastic starch and biodegradable resin technology, applied in the field of starch-based biodegradable films, can solve problems such as poor compatibility, impact on mechanical properties and film blowing efficiency, and poor mechanical properties
Active Publication Date: 2022-01-04
NANJING WURUI BIODEGRADABLE NEW MATERIAL RES INST CO LTD
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Problems solved by technology
However, the biodegradable films made of common thermoplastic starch have relatively poor mechanical properties, rough film surface, poor transparency, etc. At the same time, the compatibility of starch with other biodegradable materials is poor, and the amount of starch added is relatively limited. , the increase of starch content has a great influence on the mechanical properties and blown film efficiency
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Embodiment 1-8
[0052] The preparation method of thermoplastic starch masterbatch, its step comprises:
[0053] (1) Take 100 parts of starch, adjust the starch to a water content of 22%, add 3 parts of oxidized starch and 4 parts of hydroxypropyl starch, and carry out the first high-speed stirring at room temperature;
[0054] (2) Raise the temperature to 50-70°C, add a part of additives, and carry out the second high-speed stirring;
[0055] (3) Heat up to 75-95°C, add the remaining additives, and perform the third high-speed stirring;
[0056] (4) Add the biodegradable resin for the masterbatch, and carry out the fourth high-speed stirring;
[0058] (6) The starch after heat preservation is melted and extruded to make thermoplastic starch masterbatch.
[0059] Wherein the list of ingredients is as shown in Table 1, all in Table 1 are parts by weight, and the process parameters of each step are as shown in Table 2.
[0060] Wherein...
Embodiment 9-16
[0069] The thermoplastic starch masterbatches obtained in Examples 1-8 were respectively made into starch-based biodegradable films. The steps were: blending 60 parts of thermoplastic starch masterbatches with 25 parts of PBSA and 20 parts of PBAT, and the film blowing temperature was 165°C. The inflation ratio is 4:1, and the starch-based biodegradable film is prepared by blow molding. The PBSA used therein is consistent with the PBSA added in the thermoplastic starch masterbatch.
[0070] The prepared starch-based biodegradable film was tested, and the test results are shown in Table 3. Test method: GB / T1040.3-2006.
[0071] The detection result of table 3 embodiment 9-16
[0072]
Embodiment 17-22
[0074] The preparation method of thermoplastic starch masterbatch, its step comprises:
[0075] (1) Take 100 parts of starch and partially modified starch, adjust the starch to a water content of 15-30%, and carry out the first high-speed stirring at room temperature, with a rotating speed of 900 rpm for 4 minutes;
[0076] (2) Heat up to 60°C, add 13 parts of glycerin, 2.6 parts of sorbitol, 1 part of hydroxyl-terminated polybutadiene, 1 part of epoxidized polybutadiene, 0.8 parts of maleic anhydride, 0.5 parts of citric acid, methyl 0.8 part of glycidyl acrylate, carry out the second high-speed stirring, the rotating speed is 1200 rev / min, and the time is 15 minutes;
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Abstract
The invention discloses multi-stage modified thermoplasticstarch master batch. According to the invention, starch is subjected to four-stage graded modification treatment. The graded modification treatment comprises the following steps: weighing 100 parts of starch with a water content of 15-30%, and stirring the starch in a high-speed mixer for the first time at a room temperature at a high speed; carrying out heating to 50-70 DEG C, adding polybutadiene, a plasticizer and a chemical modifier, and carrying out high-speed stirring for the second time; carrying out heating to 75-95 DEG C, adding a tackifier, a lubricant, a filler and a chain extender, and carrying out stirring at a high speed for the third time; adding biodegradable resin at the temperature, and carrying out stirring at a high speed for the fourth time; and stopping stirring, keeping the temperature for a period of time, and then adding a formed mixture into a double-screw extruder for melt extrusion. The invention also discloses a preparation method and application of the multi-stage modified thermoplastic starch master batch. The thermoplastic starch master batch disclosed by the invention can effectively improve the compatibility of starch and other biodegradable materials; and meanwhile, the content of starch in a biodegradable film is improved, and relatively good mechanical properties, film surface smoothness and certain transparency are kept.
Description
technical field [0001] The invention relates to a multi-stage modified thermoplastic starch masterbatch, its preparation method and its application in the preparation of starch-based biodegradable film, and the prepared starch-based biodegradable film, belonging to the field of biodegradable plastics. Background technique [0002] Conventional plastic products such as polyethylene (PE), polypropylene (PP), polystyrene (PS), etc. are very stable, can exist in nature for a long time, are difficult to degrade, and are called white garbage, causing serious environmental pollution. pollute. In order to alleviate environmental pressure, biodegradable plastics have become a current research and development hotspot. [0003] Biodegradable plastics refer to polymer materials that can decompose into carbon dioxide and water in a short period of time under normal environmental conditions. Currently common ones are: biodegradable homopolyesters, such as PHA, PLA, PHB, PCL, PHBV, etc.,...
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Application Information
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