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Nanoparticle industrial processing method based on natural polymer without melting point

A natural polymer and nanoparticle technology, applied in the field of polymer material forming and processing, can solve the problems of reducing the viscous flow transition temperature and glass transition temperature of non-melting point natural polymers, low product strength, difficult processing, etc. Absorbent properties and chemically active, high-strength effects

Active Publication Date: 2019-06-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for industrial processing of nanoparticles based on natural polymers with no melting point. With the small size effect of nanomaterials, it can reduce the visco-flow transition temperature and glass transition temperature of natural polymers without melting point, which is easy to process. In addition, based on the surface effect and small size effect of nanomaterials, it can solve the problem of natural polymers without melting point. Technical problems of processing and obtaining products with low strength, light absorption and chemical activity

Method used

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  • Nanoparticle industrial processing method based on natural polymer without melting point
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Examples

Experimental program
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Effect test

Embodiment 1

[0040] The implementation steps are as follows:

[0041] 1) Preparation materials: natural polymers with no melting point, such as microcrystalline cellulose powder, after 24 hours of ball milling at 1500rpm, the particle size is reduced to the nanometer level, and cellulose nanosphere materials with a uniform particle size of 1 to 1000nm are obtained ;

[0042] 2) Freeze-drying: use a freeze-drying machine to completely dry the material in a vacuum at -80°C to ensure that the cellulose nanosphere material does not agglomerate and has good fluidity;

[0043] 3) Obtain the processing temperature range: adopt thermogravimetric analysis to obtain the thermal decomposition temperature of the material, and use differential scanning calorimetry to obtain glass transition temperature and viscoflow transition temperature;

[0044] 4) Prepare the mold: This experiment uses a φ30 sheet mold, and the surface requirements of the mold cavity are very high, and the roughness is at the mirr...

Embodiment 2

[0050] The implementation steps are as follows:

[0051] 1) Preparation materials: natural polymers without melting point, such as microcrystalline cellulose powder, after ball milling at 1600rpm for 40 hours, reduce the particle size to nanometer level, and obtain cellulose nanosphere materials with uniform particle size of 1-1000nm ;

[0052] 2) Freeze-drying: use a freeze-drying machine to completely dry the material in a vacuum at -60°C to ensure that the cellulose nanosphere material does not agglomerate and has good fluidity;

[0053] 3) Obtain the processing temperature range: adopt thermogravimetric analysis to obtain the thermal decomposition temperature of the material, and use differential scanning calorimetry to obtain glass transition temperature and viscoflow transition temperature;

[0054] 4) Prepare the mold: This experiment uses a φ30 sheet mold, and the surface requirements of the mold cavity are very high, and the roughness is at the mirror level. The str...

Embodiment 3

[0060] The implementation steps are as follows:

[0061] 1) Preparation materials: natural polymers with no melting point, such as microcrystalline cellulose powder, after 10 hours of ball milling at 1700rpm, reduce the particle size to nanometer level, and obtain cellulose nanosphere materials with a uniform particle size of 1-1000nm ;

[0062] 2) Freeze-drying: use a freeze-drying machine to completely dry the material in a vacuum at -70°C to ensure that the cellulose nanosphere material does not agglomerate and has good fluidity;

[0063] 3) Obtain the processing temperature range: adopt thermogravimetric analysis to obtain the thermal decomposition temperature of the material, and use differential scanning calorimetry to obtain glass transition temperature and viscoflow transition temperature;

[0064] 4) Prepare the mold: This experiment uses a φ30 sheet mold, and the surface requirements of the mold cavity are very high, and the roughness is at the mirror level. The st...

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Abstract

The invention belongs to the field of macromolecule material molding production, and particularly relates to a nanoparticle industrial processing method based on a natural polymer without a melting point. The nanoparticle industrial processing method comprises the following steps that (a) the natural polymer without the melting point is chosen as a raw material and subjected to ball-milling and freezing drying, a nanoball material with good mobility is obtained, and then the thermal decomposition temperature, the glass transition temperature and the viscous transition temperature of the nanoball material are obtained; and (b) the nanoball material with the good mobility is added to a mold, and the required product is obtained through temperature rising, temperature insulation and pressurerising and cooling pressure relief. According to the nanoparticle industrial processing method based on the natural polymer without the melting point, direct molding without a solution of the naturalpolymer without the melting point is realized, and the problems that the natural polymer is hard to process and the strength, the photo-absorption and the chemical activity of the obtained product arelow are solved.

Description

technical field [0001] The invention belongs to the field of polymer material forming and processing, more specifically, relates to a nano particle industrial processing method based on a natural polymer without melting point. Background technique [0002] Natural polymers are high molecular compounds formed by biochemical or photosynthesis in nature or minerals. They are widely found in animals, plants or minerals. Moreover, they have the advantages of biocompatibility, degradability, non-toxicity, and environmental protection. . The fossil fuels currently used by people are non-renewable and pollute seriously. To achieve clean production and green manufacturing, natural polymers are expected to replace them as a new type of material and new energy source. [0003] Polymer forming processing is usually the process of melting or deforming solid state, pasty or solution polymer compounds, forming the desired shape through a mold, maintaining the obtained shape, and finally o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/02B29C43/32
Inventor 王云明张云周华民孙艳玲黄志高李德群符岳
Owner HUAZHONG UNIV OF SCI & TECH
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