Full starch degradable plastic
The National Plastic Products Quality Supervision and Inspection Center tested corn starch plastic bags, corn starch plastic sheets, and corn starch films under controlled composting conditions in accordance with GB/T 19077 (IDT ISO 14855), and the final biodegradation rate was 95% the above.
Blown starch into degradable plastic bags
According to the mold erosion test of GB/T 19077 (IDT ISO 14855), the National Plastic Products Quality Supervision and Inspection Center conducted potential degradation tests on various environmental degradation bags with different starch content. The experimental results are as follows:
28 days after the test, the quality loss of PE plastic bags containing 50% potato starch and 50% corn starch PE plastic bags has exceeded 35%, of which 50% potato starch PE plastic bags are basically broken down into small pieces. However, PE plastic bags containing 15% to 25% corn starch have an average value of 11.5% after 28 days, but PE plastic bags without starch are basically mold-free (intact) after 28 days.
It can be concluded from the above experiments that the addition of starch is definitely beneficial to the growth of mold, when the starch content exceeds 50%. The mold erosion effect of environmentally friendly degradation bags is certainly good, but when the starch content is 15% to 30%, the increase in starch content will not have a great impact on the loss of degradable plastics. The reason may be that the microbial attack point of the plastic in the degradation experiment did not increase greatly with the rapid increase of starch content, so that the quality loss did not increase greatly with the rapid increase of starch content.
The above experiment shows that although starch-filled traditional plastic bags (PE plastic bags) cannot be biodegraded, they have partial degradation properties and are susceptible to mold erosion. Therefore, in the development of environmentally friendly degradable plastic bag products, attention should be paid to the required degradation performance requirements and the requirements for mold prevention.
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