DEGRADABLE PLASTIC AND MANUFACTURING METHOD THEREOF

• US 20130225731A1
• Filed: 04/22/2011
• Published: 08/29/2013
• Est. Priority Date: 02/28/2011
• Status: Active Grant

• Current Assignee: Jiangsu Jinhe Hi-Tech Co., Ltd.
• Original Assignee: Jiangsu Jinhe Hi-Tech Co., Ltd.
• Inventors: Yin, Zhengfu
• Granted Patent: US 9,051,466 B2
• Time in Patent Office: Days
• US Class Current: 524/15
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: C08L 97/02 Lignocellulosic material, e.g. wood, straw or bagasse manufacture of articles made from lignocellulosic material by dry processes B27N

Abstract

A degradable plastic and a manufacturing method thereof are provided. The degradable plastic is made by mixing plastic, dry crop straw scraps and additives and extruding the mixture into granules with a double-screw extruder. The weight fraction of the plastic, crop straw scraps and additives is 63-73 wt %, 23-33 wt % and 4-6 wt % based on the total weight of raw material. The obtained granules are even, stable and can be used to manufacture daily necessities such as dishware, containers, stationery and bags having smooth surface, high strength, excellent toughness and comfortable hand feeling.

Claims

1. A degradable plastic, wherein comprising degradable plastic, crop straw and plastic additives, the weight fraction of the degradable plastic, crop straw and additives is 63-73 wt %, 23-33 wt % and 4-6 wt % based on the total weight of raw material.

2. A degradable plastic according to claim 1, wherein the degradable plastic is poly lactic acid or poly butylenes succinate.

3. A degradable plastic according to claim 2, wherein the degradable plastic further includes polyhydroxyalkanoates or polycaprolactone.

4. A degradable plastic according to claim 1, wherein the crop straw is any of rice straw, wheat straw, wheat bran, corn cob or corn stalk.

5. A degradable plastic according to claim 1, wherein the plastic additives are any of silane coupling agent, aluminate/titanate complexing coupling agent, ethylene bis-stearomide or titanium dioxide.

6. A crop plastic manufacturing method according to claim 1, wherein mix the crop straw scraps of 1.5˜

2.0 mm in length after being dried, the plastic and the plastic additives, extrude the mixture into granules with a double-screw extruder;

the weight fraction of the plastic, crop straw scraps and additives is 63-73 wt %, 23-33 wt % and 4-6 wt % based on the total weight of raw material.

7. A degradable plastic according to claim 1, wherein the crop straw is applied with rice straw, crush the rice straw to be scraps of 1.5˜

2.0 mm in length, apply silane coupling agent and ethylene bis-stearomide as the plastic additives, mix with the injection class poly lactic acid and extrude the mixture into granules with a double-screw extruder;

when adding the material, the weight fraction of the rice straw, the silane coupling agent, the ethylene bis-stearomide and the injection class poly lactic acid is 23˜

33%, 1˜

1.5%, 3˜

45%, 63-73% based on the total weight of raw material.

8. A degradable plastic according to claim 1, wherein the crop straw is applied with wheat straw and corn stalk, crush the wheat straw and corn stalk of 1000˜

4200 mesh, apply aluminate/titanate complexing coupling agent, ethylene bis-stearomide and titanium dioxide as the plastic additives, mix with the blow film class polydiethylene glycol sebacate and extrude the mixture into granules with a double-screw extruder;

when adding the material, the weight fraction of the wheat straw, the corn stalk, the alumniate/titanate complexing coupling agent, ethylene bis-stearomide, titanium dioxide and the blow film class polydiethylene glycol sebacate is 10˜

13%, 13˜

20%, 1˜

2%, 1.2˜

2%, 1.5˜

2%, 63˜

73% based on the total weight of raw material.

9. A degradable plastic according to claim 1, wherein the crop straw is applied with rice straw, wheat straw, corn cob, wheat bran, crush above crop straw into powder of 1000˜

1200 in mesh, apply ethylene bis-stearomide and titanium dioxide as the plastic additives, mix with drawing class polylactic acid and extrude the mixture into granules with a double-screw extruder;

when adding the material, the weight fraction of the rice straw, the wheat straw, the corn cob, the wheat bran, the ethylene bis-stearomide, the titanium dioxide and the drawing class polylactic acid is 5˜

8%, 5˜

8%, 5˜

7%, 8˜

10%, 1.5˜

2%, 2˜

4%, 63˜

73% based on the total weight of raw material.