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Plant fiber enhanced starch composite packaging material and preparation method thereof

A composite packaging material and plant fiber technology, which is applied in the field of plant fiber reinforced starch composite packaging material and its preparation, can solve the problems of easy moisture absorption, weak mechanical strength, poor water resistance, etc., achieve low price, increase tensile strength, and improve mechanical strength. performance effect

Inactive Publication Date: 2012-10-24
广东普科特粉末涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of poor water resistance, easy moisture absorption, and weak mechanical strength existing in existing fully biodegradable materials, and to provide a plant fiber reinforced starch composite material and its preparation method; to achieve improved biodegradable composite packaging The water resistance of the material improves its mechanical strength; it can really completely alleviate the "white pollution" caused by plastics

Method used

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  • Plant fiber enhanced starch composite packaging material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Straw fiber treatment: crush rice straw, pass through a 60-70 mesh sieve, and soak in 2 kg of LiCl / DMAC solution with a weight percentage of 8%-12% at a temperature of 30°C-35°C for 10-30min;

[0019] (2) Raw materials: 20 kg of cationic modified potato starch, 5 kg of straw fiber, 5 kg of polyvinyl alcohol, 1 kg of inorganic filler, 2 kg of crosslinking agent, and 5 kg of plasticizer; among them, cationic potato starch is processed by potato starch Cationic starch prepared by etherification reaction with N-(2,3-epoxypropyl)trimethylammonium salt (GTA) in the presence of alkali catalyst, and add half of it to 3 kg of hot water at 65~80°C gelatinized, ready to use;

[0020] (3) Put half of the gelatinized cationic potato starch, soaked straw fiber, fully degraded heat stabilizer polyvinyl alcohol, and plasticizer in a high-speed mixer for 8-10 minutes, and then add the other half of ungelatinized potatoes Starch, inorganic filler and crosslinking agent, in a high-sp...

Embodiment 2

[0025] (1) Treatment of straw fibers: crush 10 kg of rice straw, pass through a 60-70 mesh sieve, and soak in 3 kg of LiCl / DMAC solution with a weight percentage of 8%-12% at a temperature of 30°C-35°C10 ~30min;

[0026] (2) Preparation of materials: 30 kg of cationic modified potato starch, 10 kg of straw fiber, 12 kg of polyvinyl alcohol, 3 kg of inorganic filler, 4 kg of crosslinking agent, and 7 kg of plasticizer; among them, cationic potato starch is processed by potato starch Cationic starch prepared by etherification reaction with N-(2,3-epoxypropyl)trimethylammonium salt (GTA) in the presence of alkali catalyst, and add half of it to 4.5 kg of hot water at 65~80°C gelatinized, ready to use;

[0027] (3) Put half of the gelatinized cationic potato starch, treated straw fiber, fully degraded heat stabilizer polyvinyl alcohol, and plasticizer in a high-speed mixer for 8-10 minutes, then add the remaining ungelatinized potato starch, Inorganic filler and crosslinking age...

Embodiment 3

[0032] (1) Treatment of straw fibers: crush 20 kg of rice straw, pass through a 60-70 mesh sieve, and soak in 5 kg of LiCl / DMAC solution with a weight percentage of 8%-12% at a temperature of 30°C-35°C10 ~30min;

[0033] (2) Raw material preparation: 50 kg of cationic modified potato starch, 20 kg of straw fiber, 12 kg of polyvinyl alcohol, 5 kg of inorganic filler, 5 kg of crosslinking agent, and 8 kg of plasticizer; among them, cationic potato starch is processed by potato starch Cationic starch prepared by etherification reaction with N-(2,3-epoxypropyl)trimethylammonium salt (GTA) in the presence of alkali catalyst, and add half of it to 5 kg of hot water at 65~80°C gelatinized, ready to use;

[0034] (3) Put half of the gelatinized cationic potato starch, treated straw fiber, fully degraded heat stabilizer polyvinyl alcohol, and plasticizer in a high-speed mixer for 8-10 minutes, then add the remaining ungelatinized potato starch, Inorganic filler and crosslinking agent...

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Abstract

The invention discloses a plant fiber enhanced starch composite packaging material and a preparation method thereof. The plant fiber enhanced starch composite packaging material is prepared by the steps of mixing 40 to 60 weight parts of cation modified potato starch, 10 to 20 weight parts of straw fiber, 5 to 10 weight parts of polyvinyl alcohol, 5 to 10 weight parts of inorganic filler, 5 to 10weight parts of cross-linking agent, and 5 to 10 weight parts of plasticizer, and melting, mixing and extruding by using a double-screw extruder. Compared with the conventional thermoplastic potato starch composite packaging material, the plant fiber enhanced starch composite packaging material has the advantages that: the tensile strength is improved by 40 to 60 percent, the deflection is improved by 40 to 60 percent, and the water absorption rate is reduced by 15 to 30 percent.

Description

technical field [0001] The invention relates to a plant fiber reinforced starch composite packaging material and a preparation method thereof. Background technique [0002] At present, the packaging materials used in large quantities are still mainly non-degradable plastic packaging materials, forming serious "white pollution". One of the biodegradable natural polymer raw materials currently used is starch; such as corn starch, potato starch , sweet potato starch, potato starch, wheat starch, etc.; starch is a polysaccharide compound, which is decomposed by microorganisms in the natural environment, and finally decomposed into non-toxic CO 2 and H 2 O, and the source is wide and the price is low. However, the starch molecular chain contains a large number of hydroxyl groups, which are easy to form hydrogen bonds inside and outside the molecular chain, so it is insoluble, difficult to melt, and has poor water resistance. When it encounters water or in humid air for a long t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/08C08L97/02C08L29/04C08K3/22C08K3/34C08K5/21
Inventor 曾广胜林瑞珍
Owner 广东普科特粉末涂料有限公司
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