Method for preparing modified micro-rods and reinforced plastic containing modified micro-rods

A technology of reinforced plastics and micron rods, which is applied in pulp beating/refining methods, fiber raw material treatment, acid acid/anhydride pulping, etc. It can solve the problems of low recycling rate, low utilization rate of straw, limited chemical methods, etc. problems, to achieve the effect of increasing utilization rate, maximizing utilization value and improving strength

Active Publication Date: 2019-04-16
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the methods for preparing modified straw fibers disclosed in the prior art are relatively limited to chemical methods, and the current research is especially focused on the field of preparing maleic anhydride-modified cellulose. The methods used are chemical methods, which require heating and heating during the preparation process. The use of organic solvents, acid-base or organic solvents will be used in the preparation process, and lignin and hemicellulose will be partially removed, resulting in low utilization of straw
The preparation of straw fiber as a reinforcement and its surface treatment technology can no longer meet the needs. To develop a straw fiber composite material with stable and reliable comprehensive performance, it is necessary to update the process and better handle straw fiber.
[0004] Polyolefin-based thermoplastics have problems such as poor degradation performance and low recycling rate

Method used

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  • Method for preparing modified micro-rods and reinforced plastic containing modified micro-rods
  • Method for preparing modified micro-rods and reinforced plastic containing modified micro-rods
  • Method for preparing modified micro-rods and reinforced plastic containing modified micro-rods

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The straw is reed straw (reed straw), crushed, washed and fully dried, and passed through a 60-mesh sieve. The ball milling speed of the ball mill jar was 300 rpm. The total mass of the ball is 65g.

[0035] The straw and maleic anhydride (MA) were added into the ball mill tank at a mass ratio of 1:3. The ball milling time is 0.5h.

Embodiment 2-6

[0037] Raw material and equipment are with embodiment 1. The difference is that the time of ball milling is 1, 2, 3, 4, 5 hours respectively.

[0038] Morphological observation

[0039] The scanning electron microscope picture of the modified straw fiber rod prepared by embodiment 1-6 is as follows figure 1 . Through microscopic observation, it is found that the morphology of cellulose can be maintained to a certain extent with maleic anhydride ball milling. and figure 1 Figure (h) does not have maleic anhydride, and the products all become particles. With the increase of ball milling time, the size of fiber rods gradually decreased.

[0040] Micro rods obtained by ball milling for 1 to 5 hours, see figure 1 From (c) to (g), it can be seen that the size is uniform, with a diameter of about 10 μm and a length of about 40 μm. Further zooming in, it can be seen that there is uniform and dense maleic anhydride on the surface of the straw.

[0041] figure 2 After mixing m...

Embodiment 7

[0043] The straw is reed straw (reed straw), crushed, washed and fully dried, and passed through a 60-mesh sieve. The ball milling speed of the ball mill jar was 300 rpm. The total mass of the ball is 65g.

[0044] The straw and tartaric acid are added into the ball milling tank at a mass ratio of 1:3. The ball milling time is 2h.

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Abstract

The invention provides a method for preparing modified micro-rods. The method includes the operation steps that straw is mixed with organic acid or anhydride, and the mixture is ball-milled for 0.5-5h under the solvent-free condition, wherein the organic acid is selected from tartaric acid, citric acid, p-toluenesulfonic acid, adipic acid and stearic acid, and the anhydride is maleic anhydride. The invention further provides the modified micro-rods prepared with the method, and reinforced plastic containing the modified micro-rods. Modified fiber rods are directly prepared from the straw witha one-step ball-milling method, and modified corncob cellulose nano-fibers are applied to improving the mechanical performance of the plastic. On one hand, the method is efficient, environmentally friendly and free of solvents and completed at a step; on the other hand, the straw without being purified is directly used as the raw material, the modified micro-rods with uniform structures are prepared, the utilization rate of the straw is greatly increased, and high utilization value is also achieved on the aspect of industrialization. The obtained modified micro-rods are used for toughening the plastic, and the strength of the plastic is greatly improved.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a method for preparing modified microrods by using straw as a raw material, a product obtained by the method, and a reinforced plastic prepared by using the product. Background technique [0002] The current main ways of straw recycling include straw fertilizer, straw energy utilization, feed production and fiberboard preparation. In our country, more than 30wt% of crop straw is burned on the spot every year. The black smoke produced by burning straw is not only harmful to human body Health hazards, and further exacerbated the global greenhouse effect. [0003] Straw fiber is a method of chemically and physically mechanically treating straw materials to obtain stabilized and refined cellulose fibers. Generally speaking, two methods are used for surface treatment of straw fibers: physical methods and chemical methods. Physical methods include surface fibrillation tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/04D21D1/28C08L23/12C08L1/02C08L23/06
CPCC08L23/06C08L23/12D21C3/04D21D1/28C08L1/02
Inventor 吴敏黄勇刘旭冉苗晓宇
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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