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Enhanced thermoplastic starch composite material and preparation method thereof

A technology of enhanced thermoplastic and composite materials, applied in the field of thermoplastic polymer materials, can solve the problems of poor mechanical properties and thermal stability, and achieve the effects of reducing water absorption, reducing rigidity, improving mechanical properties and thermal stability

Inactive Publication Date: 2017-10-20
徐冬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a reinforced thermoplastic starch composite material and its preparation method in view of the poor thermal stability and poor mechanical properties of the existing thermoplastic starch materials, which limit its use

Method used

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  • Enhanced thermoplastic starch composite material and preparation method thereof
  • Enhanced thermoplastic starch composite material and preparation method thereof

Examples

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Effect test

example 1

[0026] Weigh 5kg of hemp fiber, put it into a pulverizer after natural air drying, and pass through a 100-mesh sieve. Put the sieved hemp fiber powder into a steam explosion tank, heat it to 200°C under a sulfur dioxide atmosphere, and then pour it into a steam explosion tank. Introduce steam until the pressure inside the tank is 1.9 MPa. After maintaining the pressure for 8 minutes, open the valve of the steam explosion tank to release the pressure. After releasing the pressure to normal pressure, filter to obtain filter residue A, and wash filter residue A with 80°C deionized water for 5 times to obtain steam explosion treatment. Hemp fiber powder after steam explosion treatment; Weigh 200g of hemp fiber powder after steam explosion treatment, soak in 600mL mass fraction of 10% hydrogen peroxide solution, react in 80°C constant temperature water bath for 2h, get mixed solution, and then use mass fraction of 5% sodium hydroxide solution to adjust the pH of the mixed solution t...

example 2

[0028] Weigh 3kg of hemp fiber, put it into a pulverizer after natural air drying, and pass through a 100-mesh sieve. Put the sieved hemp fiber powder into a steam explosion tank, heat it to 180°C under a sulfur dioxide atmosphere, and then pour it into a steam explosion tank. Introduce steam until the pressure inside the tank is 1.6 MPa. After maintaining the pressure for 5 minutes, open the valve of the steam explosion tank to release the pressure. After releasing the pressure to normal pressure, filter the filter residue A, and wash the filter residue A with 70°C deionized water for 3 times to obtain steam explosion treatment. Hemp fiber powder after steam explosion treatment; Weigh 100g of hemp fiber powder after steam explosion treatment, soak in 500mL mass fraction of 10% hydrogen peroxide solution, react in a 70°C constant temperature water bath for 1h to obtain a mixed solution, and then use a mass fraction of 5% sodium hydroxide solution to adjust the pH of the mixed s...

example 3

[0030] Weigh 4kg of hemp fiber, put it into a pulverizer after natural air drying, and pass through a 100-mesh sieve. Put the sieved hemp fiber powder into a steam explosion tank, heat it to 190°C under a sulfur dioxide atmosphere, and then pour it into a steam explosion tank. Introduce steam until the pressure inside the tank is 1.7MPa. After maintaining the pressure for 7 minutes, open the valve of the steam explosion tank to release the pressure. After releasing the pressure to normal pressure, filter the filter residue A, and wash the filter residue A 4 times with 75°C deionized water to obtain steam explosion treatment. Hemp fiber powder after steam explosion treatment; Weigh 150g of hemp fiber powder after steam explosion treatment, soak in 550mL mass fraction of 10% hydrogen peroxide solution, react in a 75°C constant temperature water bath for 1h to obtain a mixed solution, and then use the mass fraction of 5% sodium hydroxide solution to adjust the pH of the mixed solu...

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Abstract

The invention relates to an enhanced thermoplastic starch composite material and a preparation method thereof, and belongs to the technical field of thermoplastic macromolecule materials. The preparation method comprises the following steps of loading modified starch, toughening filler, and hemp cellulose into a double-screw extruder, plasticizing, extruding, and granulating, so as to obtain the enhanced type thermoplastic starch composite material, wherein the modified starch comprises radiation starch, a plasticizer and deionized water; the radiation starch is starch radiated by 60 Co-gamma rays; the toughening filler is selected from one of polyvinyl alcohol P6000, polyvinyl alcohol P10000 and polyvinyl alcohol P20000; the hemp cellulose is prepared by crosslinking and modifying vapor-blast cellulose and glutaraldehyde, and modifying surface by succinic anhydride. The preparation method has the advantages that the cellulose in the hemp fiber is extracted by a blasting method, and is crosslinked and modified with the glutaraldehyde, and the surface is modified by the succinic anhydride; by introducing carboxyl groups, the interface adhesion force with starch matrix is enhanced, the mechanical property and thermal stability of the composite material are improved, and the water adsorbing property is decreased.

Description

technical field [0001] The invention relates to a reinforced thermoplastic starch composite material and a preparation method thereof, belonging to the technical field of thermoplastic polymer materials. Background technique [0002] Starch is an important renewable and biodegradable natural polymer material, which is widely used in food and textile industries. In order to further expand the use of starch in the industrial field, it is desired to turn starch into a thermoplastic polymer material. However, there are a large number of hydroxyl groups on the starch molecule, and its adjacent molecules form strong crystallization through hydrogen bonds, and a large number of molecular chains gather together to form a tight double helix structure, resulting in a hard outer shell for starch crystalline particles. Due to the hydrogen bond interaction generated by a large number of hydroxyl groups on the surface of starch granules, it has a strong intramolecular synergy and is not ...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L1/02C08L71/02C08J3/28C08J5/06C08J5/10
CPCC08L3/02C08J3/28C08J5/06C08J5/10C08J2303/02C08J2401/02C08J2471/02C08L2201/08C08L2205/03C08L2205/16C08L1/02C08L71/02
Inventor 王国峰薛焱璟王之霖
Owner 徐冬
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