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Process for preparing wheat straw/plastic film composite material

A composite material and a preparation process technology, applied in the field of composite materials, can solve the problems of low utilization rate, low binding force, inability to solve the problem of wheat straw being difficult to bond, etc., and achieves improved anti-hygroscopic and water-absorbing performance, excellent friction and wear performance, and is economically practical. Advantageous effect

Inactive Publication Date: 2013-01-09
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Plastic film is widely used in agriculture, packaging materials, household daily necessities, etc. However, the extensive use of plastic film has caused serious "white pollution". At present, there is no good recycling method for waste plastic film; my country is a large agricultural country, and crops A large amount of by-product straw is discarded, and the utilization rate is low. Therefore, the utilization of plastic film and straw has important practical significance for environmental protection and resource regeneration and recycling.
However, in the manufacture of wood-based panels, the shortcoming that wheat straw is not easy to bond cannot be solved. This is because there is a dense and smooth hydrophobic horny waxy film on the surface of wheat straw, which prevents the matrix from infiltrating into the interior of wheat straw fibers, making wheat straw fibers and The compatibility of the matrix is ​​poor, the binding force is low, and the traditional single surface treatment cannot achieve a good modification effect

Method used

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  • Process for preparing wheat straw/plastic film composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In Example 1, the wheat straw powder was soaked in NaOH solution with a mass fraction of 5% for 48 hours, and then rinsed until the pH test paper was neutral, and dried; KH550 silane coupling agent and ethanol were mixed according to a volume ratio of 1:5 Solution, put the wheat straw powder pretreated in the first step into a high-speed mixing mixer, spray the coupling agent solution while stirring, until the coupling agent solution fully soaks the wheat straw powder uniformly, take it out, and dry at 105°C. The wheat straw and polypropylene film after the composite treatment are mixed in a mixer to promote the uniform dispersion of the fiber in the matrix. The temperature of the roller before mixing is 175℃, and the temperature of the rear roller is 165℃, and the time is 5-7 minutes. It is molded into a plate vulcanizer, the hot pressing temperature is 180°C, the pressure is 12.5MPa, and the time is 12min.

Embodiment 2

[0013] In Example 2, the wheat straw powder was soaked in 5% acetic acid solution for 48 hours, and then rinsed until the pH test paper was neutral, and dried; KH550 silane coupling agent and ethanol were mixed according to the volume ratio of 1:5 Solution, put the wheat straw powder pretreated in the first step into a high-speed mixing mixer, spray the coupling agent solution while stirring, until the coupling agent solution fully soaks the wheat straw powder uniformly, take it out, and dry at 105°C. The wheat straw and polypropylene film after the composite treatment are mixed in a mixer to promote the uniform dispersion of the fiber in the matrix. The temperature of the roller before mixing is 175℃, and the temperature of the rear roller is 165℃, and the time is 5-7 minutes. It is molded into a plate vulcanizer, the hot pressing temperature is 180°C, the pressure is 12.5MPa, and the time is 12min.

Embodiment 3

[0014] Example 3, place wheat straw powder in a constant temperature pot with deionized water for steaming, temperature 90℃, time 2h, take out to dry, and dry at 105℃; mix KH550 silane coupling agent and ethanol according to the volume ratio of 1:5 Into a solution, put the wheat straw powder pretreated in the first step into a high-speed mixing mixer, spray the coupling agent solution while stirring, until the coupling agent solution fully and evenly infiltrate the wheat straw powder, take it out, and dry at 105°C. The wheat straw and polypropylene film after the composite treatment are mixed in a mixer to promote the uniform dispersion of the fiber in the matrix. The temperature of the roller before mixing is 175℃, and the temperature of the rear roller is 165℃, and the time is 5-7 minutes. It is molded into a plate vulcanizer, the hot pressing temperature is 180°C, the pressure is 12.5MPa, and the time is 12min.

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Abstract

The invention relates to a process for preparing a wheat straw / plastic film composite material. According to the process, a plastic film of the composite material is reinforced through wheat straw fibers, a combined treatment method (that is, wheat straw is treated through a physical or chemical method, and then a combined coupling agent is used) is used for conducting surface treatment on wheat straw fibers, the interface bonding strength between wheat straw fibers and a plastic matrix is improved, and the wheat straw / plastic film composite material can be manufactured through technologies such as melt blending and compression molding. The process has the advantages that compared with wheat straw / plastic film composite materials which are treated by a coupling agent merely, the mechanical property and the moisture-absorption water-absorption resistance of the composite material which is subjected to combined treatment are greatly improved, the frictional wear performance of the composite material is better than that of composite materials which are prepared by wheat straw and treated by the coupling agent merely. The composite material is prepared for packaging plastic films and agricultural waste and has significant realistic meaning in terms of environmental protection and resource recycling.

Description

Technical field [0001] The invention relates to a composite material made of wheat straw fiber reinforced plastic film (taking polypropylene as an example). The surface treatment of the wheat straw fiber is carried out by using a composite treatment method to improve the interface bonding force between the wheat straw fiber and the plastic matrix. The production of wheat straw / plastic film composite materials by blending, compression molding and other processes belongs to the field of composite materials. Background technique [0002] Plastic film is widely used in agriculture, packaging materials, household daily necessities, etc. However, the large-scale use of plastic film has caused serious "white pollution". At present, there is no good recycling method for waste plastic film; my country is a large agricultural country with crops. A large amount of by-product straw is discarded and the utilization rate is low. Therefore, the use of plastic film and straw has important practic...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L97/02C08K5/098D21B1/30B29C35/02
Inventor 何春霞于旻
Owner NANJING AGRICULTURAL UNIVERSITY
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