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Preparation method of interface-modified rice husk powder/polylactic acid biodegradable composite material

A composite material and biodegradable technology, which is applied in the field of preparation of interface-modified rice husk powder/polylactic acid biodegradable composite materials, can solve the problem of poor heat resistance and mechanical properties of polylactic acid materials, poor interface compatibility, and difficulty in forming Membrane and other issues, to achieve the effect of increasing the value of by-products, low cost, and good water resistance

Inactive Publication Date: 2019-08-16
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, polylactic acid is a non-polar linear polymer, while lignin and cellulose in rice husk powder have strong polarity, and the interfacial compatibility between the two is poor.
Polylactic acid is a hard and brittle hydrophobic material. Its products have low crystallinity, are not easy to form films, and are generally amorphous, resulting in poor heat resistance and mechanical properties of polylactic acid materials.

Method used

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  • Preparation method of interface-modified rice husk powder/polylactic acid biodegradable composite material
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  • Preparation method of interface-modified rice husk powder/polylactic acid biodegradable composite material

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preparation example Construction

[0041] The invention provides a method for preparing an interface-modified rice husk powder / polylactic acid biodegradable composite material, which is characterized in that it comprises the following steps:

[0042] Step 1. Grinding the rice husks into 80-200 mesh powders, treating them with alkali with sodium hydroxide solution, drying them for later use;

[0043] Step 2. Inject the dried rice husk powder, polylactic acid, silane coupling agent and other raw materials into the twin-screw extruder at a ratio of 60:40:4-6 by weight fraction, and obtain interface modification by screw extrusion. Rice husk powder / polylactic acid biodegradable composites.

[0044] In a preferred version, in the step 1, the specific method of rice husk powder processing is:

[0045] Wash the rice husk with water for 1-2 times to remove solid impurities and dust. After air-drying, use a universal grinder to grind it to 80-200 mesh.

[0046] In a preferred version, in the step 1, the specific method ...

Embodiment 1

[0066] Step 1. Grinding the rice husks into 80-200 mesh powders, treating them with alkali with sodium hydroxide solution, drying them for later use;

[0067] Step 2. Inject the dried rice husk powder, polylactic acid, silane coupling agent and other raw materials into the twin-screw extruder in a ratio of 60:40:4 by weight fraction, and extrude the interface-modified rice husk Powder / PLA biodegradable composite.

Embodiment 2

[0069] Step 1. Grinding the rice husks into 80-200 mesh powders, treating them with alkali with sodium hydroxide solution, drying them for later use;

[0070] Step 2. Inject the dried rice husk powder, polylactic acid, silane coupling agent and other raw materials into the twin-screw extruder at a ratio of 60:40:4.5 by weight fraction, and extrude through the screw to obtain interface-modified rice husk Powder / PLA biodegradable composite.

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Abstract

The invention discloses a preparation method of an interface-modified rice husk powder / polylactic acid biodegradable composite material. The preparation method comprises the following steps: grindingrice husks to form a 80-200 mesh powder, performing alkali treatment by using a sodium hydroxide solution, and drying the alkali-treated rice husk powder for later use; and injecting the dried rice husk powder, polylactic acid and a silane coupling agent into a twin-screw extruder according to a weight part ratio of 60:40:(4-6), and performing screw extrusion to obtain the interface-modified ricehusk powder / polylactic acid biodegradable composite material. The method has the advantages of simplicity, easily available raw materials, and easiness in realization of large-scale production. The rice husk powder / polylactic acid biodegradable composite material obtained by the preparation method has the characteristics of hardness, high density, non-toxicity, environmental protection, and good toughness, good firmness and good aging resistance, and can be automatically degraded into an organic fertilizer after being used.

Description

technical field [0001] The invention relates to the field of chemical materials. Specifically relates to a method for preparing an interface-modified rice husk powder / polylactic acid biodegradable composite material. Background technique [0002] Plastic is closely related to our life and is the most widely used synthetic material. Traditional plastics are mostly thermoplastic resin materials such as polyethylene, polypropylene, and polyvinyl chloride. These materials have large raw materials, low prices, and are easy to process. However, resin plastics are extremely difficult to degrade naturally after use, and the cost of manual treatment is very high, and poisonous gas is likely to be generated during the treatment process, which affects people's healthy life. With the expansion of the global population and the increase of environmental pressure, the development of degradable plastic products is urgent. In this context, bio-based composite materials are increasingly va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L67/04C08K3/22C08K3/26
CPCC08K2003/2241C08K2003/265C08K2201/011C08L67/04C08L97/02C08L2201/06C08K3/22C08K3/26
Inventor 刘毅梅诗意赵宗琳孙璟萌李彦辰何晓珩姜靖逸
Owner BEIJING FORESTRY UNIVERSITY
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