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Method for thermal plasticizing modification of cassava dregs through mechanical activation and enhancement

A technology of mechanical activation and cassava residue, which is applied in the field of modification of biodegradable polymer materials, can solve the problems of complex process, difficult control, long time consumption, and inefficient modification process, and achieve the effect of improving hydrophobicity and mechanical properties

Active Publication Date: 2014-03-12
GUANGXI UNIV
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems in the existing thermal plasticization modification method that the raw material only contains a single starch, the preparation process takes a long time, the process is complicated and difficult to control, resulting in high cost, and the preparation method is too simple so that the modification process cannot be carried out efficiently, and it is difficult to meet the requirements of the industry. In order to solve the above problems such as the demand for thermoplastic materials, provide a method of using cassava residue as raw material (with the advantages of starch plus fiber thermoplastic material), and adopt mechanical activation technology to strengthen the thermal plastic modification of cassava residue

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  • Method for thermal plasticizing modification of cassava dregs through mechanical activation and enhancement

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Embodiment 1

[0023] In the present embodiment, the water content of the cassava residue is 10-12%, the starch content is 35-40%, the cellulose content is 25-32%, the plasticizer is glycerin, the auxiliary agent is citric acid, and the material ball is a stainless steel ball. The diameter is 6mm.

[0024] Weigh the reaction materials according to the ratio of cassava residue: plasticizer: auxiliary agent = 100g: 10g: 10g, mix the reaction materials at high speed and place them in a ball mill, control the reaction materials and balls (pile volume) = 100g: 300ml, control The temperature of the circulating water bath is 90°C, and the rotation speed is 500r / min. Stirring is carried out for mechanically activating the solid-phase reaction for 80 minutes, and the reaction material is separated from the pellets to obtain a modified cassava residue thermoplastic material.

Embodiment 2

[0026] In the present embodiment, the water content of cassava residue is 10-12%, the starch content is 35-40%, the cellulose content is 25-32%, the plasticizer is glycerin, and the auxiliary agents are citric acid and stearic acid according to the ratio of 13g:2g The composition, the material ball is a zirconia ball, and the diameter of the material ball is 5mm.

[0027] Weigh the reaction materials according to the ratio of cassava residue: plasticizer: auxiliary agent = 100g: 20g: 15g, mix the reaction materials at high speed and place them in a ball mill, control the reaction materials and material balls (pile volume) = 100g: 500ml, control The temperature of the circulating water bath is 70°C, and the rotation speed is 350r / min, and the mechanically activated solid-phase reaction is carried out with stirring for 60 minutes, and the reaction material is separated from the pellets to obtain the modified cassava residue thermoplastic material.

Embodiment 3

[0029] In the present embodiment, the water content of cassava residue is 10-12%, the starch content is 35-40%, the cellulose content is 25-32%, and the plasticizer is glycerin, formamide, urea, ethanolamine according to 10g:5g:5g:5g A composition mixed in proportion, the auxiliary agent is a composition mixed with citric acid and stearic acid in a ratio of 10g:5g, the ball is an alumina ceramic ball, and the diameter of the ball is 15mm.

[0030] Weigh the reaction materials according to the ratio of cassava residue: plasticizer: auxiliary agent = 100g: 25g: 15g, mix the reaction materials at high speed and place them in a ball mill, control the reaction materials and material balls (pile volume) = 100g: 300ml, control Under the condition of circulating water bath temperature of 50°C and rotating speed of 500r / min, mechanically activated solid-phase reaction was carried out with stirring for 60min, and the reaction material was separated from pellets to obtain a modified cassa...

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Abstract

The invention relates to the field of modification of biodegradable polymer materials, and in particularly relates to a method for thermal plasticizing modification of cassava dregs through mechanical activation and enhancement. The method comprises the following steps: weighing reactants including cassava dregs, a plasticizer and an auxiliary agent in a ratio of 100g:(10-25g):(5-15g), mixing the reactants at a high speed, then putting all the reactants into a ball mill, controlling the ratio of the reactants to pellets (stack volume) at 100g:(300-600ml), controlling the temperature of a circulating water bath at 50-90 DEG C, stirring at a low speed to perform a mechanical activation solid-phase reaction for 40-80 minutes, and separating the reactants and the pellets to obtain a modified cassava dreg thermoplastic material. The modification method disclosed by the invention is easy in operation, high in efficiency and low in cost; for a composite material obtained by performing conventional hot press molding on the modified cassava dreg thermoplastic material, the tensile strength and the bending strength reach 15.33MPa and 28.76MPa respectively, the Young modulus reaches 82.4Mpa, and the extension percentage is 6.6%.

Description

technical field [0001] The invention relates to the field of modification of biodegradable polymer materials, in particular to a method for thermal plastic modification of cassava residues reinforced by mechanical activation. Background technique [0002] As one of the three largest potato crops in the world, cassava is widely grown in tropical and subtropical regions. Guangxi is the largest cassava planting base in my country, with a planting area of ​​more than 4 million mu and an annual output of 8 million tons of cassava, accounting for 70% of the country's total planting area and output. Cassava is usually used to process and produce starch, alcohol, feed, etc. During the processing, a large amount of cassava residue waste is produced. Each ton of processed tubers produces about 900Kg of residue (containing 85% moisture). The cassava residue is mainly composed of starch (40 %-60%), cellulose (15%-50%) plus a small amount of protein and lipid. [0003] In recent ye...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L1/02C08L97/02C08K5/00C08K5/053C08K5/092C08K5/09C08K5/20C08K5/21C08K5/17
Inventor 黄祖强周静张燕娟黄爱民李艳梅许恢琴许朝珍杨梅冯振飞胡华宇覃宇奔覃杏珍
Owner GUANGXI UNIV
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