Hydrophobic thermoplastic starch composite and method for manufacturing the same
AssigneeGreen World Biotech Materials Co.,Ltd.
InventorShao Heng CHEN
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Abstract
The present invention provides a hydrophobic thermoplastic starch and method for manufacturing the same, to be used as granules for making biodegradable composites. The hydrophobic thermoplastic Starch of the invention is in a granule type, has the melt flow index in the range of 0.2˜6 g/10 min at 160° C. and has 60˜80 wt % of starch and the water content less than 9%.
Claims18
A hydrophobic thermoplastic starch composite, being of hydrophobic biodegradable granules, having a melt flow index in the range of 0.2˜6 g/10 min at 160° C. and having 60˜80 wt % of starch, water content less than 4.1%, and water contact angle being more than 65 degrees while the hydrophobic biodegradable granules are formed into a film;
- wherein the granules of the composite is formed by a reactive extrusion method using a starch composition including vegetal starch and modifier at a reaction temperature controlled in a range of a predetermined temperature±2° C., that is, between (predetermined temperature−2° C.) and (predetermined temperature+2° C.) to perform kneading and modification reaction to obtain the hydrophobic thermoplastic starch composite;
- and
- the predetermined temperature is between 120° C. and 170° C. and duration of performing kneading and modification reaction is less than 10 minutes.
A biodegradable thermoplastic composite, being formed into granules and comprising a thermoplastic starch composite and a biodegradable resin;
- wherein the biodegradable resin is selected from the group consisting of the following or combination thereof:
- polybutylene succinate, polybutylene adipate terephthalate, and polycaprolactone;
- the biodegradable thermoplastic composite includes 20˜50 wt % of the thermoplastic starch composite;
- the thermoplastic starch composite is of hydrophobic biodegradable granules, has a melt flow index in the range of 0.2˜6 g/10 min at 160° C. and having 60˜80 wt % of starch, water content less than 4.1%, and water contact angle being more than 65 degrees while the hydrophobic biodegradable granules are formed into a film;
- wherein the granules of the composite is formed by a reactive extrusion method using a starch composition including vegetal starch and modifier at a reaction temperature controlled in a range of a predetermined temperature±2° C., that is, between (predetermined temperature−2° C.) and (predetermined temperature+2° C.) to perform kneading and modification reaction to obtain the hydrophobic thermoplastic starch composite;
- and
- the predetermined temperature is between 120° C. and 170° C. and duration of performing kneading and modification reaction is less than 10 minutes.
A method for manufacturing a thermoplastic starch composite, being a reactive extrusion method to use a starch composition including vegetal starch and modifier at a reaction temperature controlled in a range of a predetermined temperature±2° C., that is, between (predetermined temperature−2° C.) and (predetermined temperature+2° C.) to perform kneading and modification reaction to obtain the hydrophobic thermoplastic starch composite;
- and
- the predetermined temperature is between 120° C. and 170° C. and duration of performing kneading and modification reaction is less than 10 minutes.
Dependencies are inferred from the claim text.