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Preparation method of degradable plastic with high starch content

A technology for degrading plastics and high starch, applied in grain processing, etc., can solve the problems of limited starch filling, uneven starch dispersion, insufficient processability, etc., achieve excellent mechanical properties, solve poor dispersion, and achieve stable preparation effects

Inactive Publication Date: 2021-03-30
合聚高分子材料科技(广东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of degradation effect, starch is currently the most commonly used second component, but the filling amount of starch is still limited, generally less than 50% by mass
Highly filled starch composites have defects such as uneven dispersion of starch, poor mechanical properties, and insufficient processability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a. Ball milling pretreatment: add 150 parts of corn starch, 0.05 parts of 4-α-glucosidyl transferase, 30 parts of glycerin, 5 parts of polyethylene glycol (molecular weight 400), 3 parts of oleic acid amide and 1 part of tartaric acid into the ball milling tank , ball milling at a speed of 300 rpm for 15 minutes at 60°C to obtain a starch mixture; during ball milling, the humidity in the ball mill tank was controlled at 30%;

[0030] b. Aging: the starch mixture after ball milling was left to stand in an oven for 48 hours, and the humidity of the oven was controlled at 30%;

[0031] c. Extrusion granulation: use a secondary extrusion device; the primary extruder is two parallel twin-screw extruders, and the length-to-diameter ratio of the extruder is 26; the secondary extruder is a twin-screw extruder The length-to-diameter ratio of the extruder is 48; the end of the primary extruder enters the secondary extruder through a mixer; 100 parts of PLA resin, 20 parts of orga...

Embodiment 2

[0033] a. Ball milling pretreatment: 200 parts of potato starch, 0.5 parts of starch-1,6-glucose transferase, 50 parts of ethylene glycol, 10 parts of polyethylene glycol (molecular weight 1000), 5 parts of glyceryl laurate and Add 1 part of glycolic acid into the ball mill tank, and ball mill at 3000 rpm for 30 minutes at 60°C to obtain a starch mixture; during ball milling, the humidity in the ball mill tank is controlled at 50%;

[0034] b. Aging: the starch mixture after ball milling was left to stand in an oven for 48 hours, and the humidity of the oven was controlled at 40%;

[0035] c. Extrusion granulation: use a secondary extrusion device; the primary extruder is two parallel twin-screw extruders, and the length-to-diameter ratio of the extruder is 26; the secondary extruder is a twin-screw extruder Out of the machine, the length-to-diameter ratio of the extruder is 48; the end of the primary extruder enters the secondary extruder through a mixer; 100 parts of PLA res...

Embodiment 3

[0037] a. Ball milling pretreatment: Add 180 parts of pea starch, 0.2 parts of limit dextrinase, 40 parts of sorbitol, 5 parts of polyethylene glycol (molecular weight 600), 4 parts of stearic acid amide and 1 part of malic acid into the ball milling tank, Ball milling at a speed of 2000rpm at 60°C for 15 minutes to obtain a starch mixture; during ball milling, the humidity in the ball mill tank was controlled at 45%;

[0038]b. Aging: the starch mixture after ball milling was left to stand in an oven for 48 hours, and the humidity of the oven was controlled at 40%;

[0039] c. Extrusion granulation: use a secondary extrusion device; the primary extruder is two parallel twin-screw extruders, and the length-to-diameter ratio of the extruder is 26; the secondary extruder is a twin-screw extruder Extruder, the length-to-diameter ratio of the extruder is 48; the end of the primary extruder enters the secondary extruder through a mixer; 100 parts of PBAT resin, 20 parts of layered ...

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Abstract

The invention discloses a preparation method of degradable plastic with high starch content. The preparation method of the degradable plastic with high starch content comprises the following steps ofcarrying out ball-milling pretreatment and aging on starch, starch debranching enzyme, a plasticizer, a chain extender, a lubricant and a softening regulator; and then respectively extruding a resin mixture and a starch mixture in parallel in two primary extruders by using a secondary extrusion device, controlling the extrusion speed ratio, enabling the mixture to enter a secondary extruder through a mixer to realize mixing, and extruding for granulation. According to the preparation method of the degradable plastic with high starch content provided by the invention, the starch can be fully and uniformly dispersed, the starch content of the prepared degradable plastic reaches 60 percent or above, and the degradable plastic has an excellent mechanical property.

Description

technical field [0001] The invention relates to the technical field of degradable materials, in particular to a method for preparing degradable plastics with high starch content. Background technique [0002] High molecular polymers have been widely used in various fields related to human life, but since most polymers are derived from petroleum and cracking products, their wastes cannot be degraded into the carbon cycle in the natural environment. The huge amount of non-degradable plastics used by humans has caused serious "white pollution", which has brought immeasurable pressure on the environment and resources. In order to deal with environmental pollution problems, research and development of degradable materials as alternative materials has become a hot topic. [0003] In recent years, with the development of degradable polymers such as polybutylene adipate terephthalate (PBAT), polycaprolactone (PCL), and polylactic acid (PLA), environmentally friendly plastic products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/625B29C48/92B29C48/40B29B9/06B29B13/02B02C17/18B02C17/10B02C25/00C08L3/02C08L67/04C08L67/02
CPCB29C48/625B29C48/92B29C48/40B29B9/06B29B13/02B02C17/1815B02C17/10B02C25/00C08L3/02C08L2201/06B29C2948/9258B29C2948/92704C08L67/04C08L67/02
Inventor 雷彩红徐睿杰
Owner 合聚高分子材料科技(广东)有限公司