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Method and product for preparing thermoplastic starch biodegradable material by supercritical fluid

A technology for biodegradable materials and thermoplastic starch, which is applied in the production of bulk chemicals, can solve the problems of difficult processing, low strength retention rate, poor processing fluidity, etc., and achieves the effects of good melt processing flow performance and simple preparation method.

Active Publication Date: 2021-12-31
上海耐特复合材料制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects of poor melt processing fluidity, difficult processing, poor moisture resistance and low strength retention rate of the thermoplastic starch prepared in the prior art, and to provide a thermoplastic starch biodegradable material prepared by supercritical fluid methods and products

Method used

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  • Method and product for preparing thermoplastic starch biodegradable material by supercritical fluid
  • Method and product for preparing thermoplastic starch biodegradable material by supercritical fluid
  • Method and product for preparing thermoplastic starch biodegradable material by supercritical fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The formulation ratios described in Table 2 below were used to prepare thermoplastic starch biodegradable composite materials.

[0054] (1) Cut and disperse starch (tapioca starch), plasticizer (glycerin) and pre-plasticized dispersant (water) in a mechanical mixer at a mass ratio of 5:2:3 for 1 hour, and add glutaraldehyde aqueous solution (pentane Dialdehyde mass percent 25wt%) 0.05phr (that is, relative to 100 parts of starch, the amount of glutaraldehyde aqueous solution is 0.05 parts), obtained starch mixed liquid;

[0055] (2) Add the starch mixture obtained by mixing the above item (1) into titanium dioxide and put it in the autoclave, and pressurize the carbon dioxide to 9.0MPa with a booster pump at 25°C; the volume ratio of the starch mixture to the autoclave is about 0.2kg / L;

[0056] (3) heat up to 100° C. in a high-pressure reactor, and gelatinize for 20 minutes under stirring with a magnetic stirrer at 190 rpm to obtain a starch gel;

[0057] (4) Put the...

Embodiment 2

[0059] The formulation ratios described in Table 2 below were used to prepare thermoplastic starch biodegradable composite materials.

[0060] Except that the addition amount of glutaraldehyde aqueous solution is different, other conditions are all the same as embodiment 1.

Embodiment 3

[0062] The formulation ratios described in Table 2 below were used to prepare thermoplastic starch biodegradable composite materials.

[0063] Except that the addition amount of glutaraldehyde aqueous solution is different, other conditions are all the same as embodiment 1.

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Abstract

The invention discloses a method and a product for preparing a thermoplastic starch biodegradable material from a supercritical fluid. It comprises the following steps: ① mix starch, plasticizer and pre-plasticizing dispersant uniformly according to the mass ratio of 1:0.2-0.4:0.2-1.2 to obtain starch mixture I; ② mix hydrophobic reactant with starch mixture I is mixed evenly to obtain starch mixture II; ③ in a supercritical fluid treatment system, the starch mixture II is mixed and reacted to obtain a starch gel; the feeding amount of starch mixture II is 0.16-0.24kg / L; The starch gelatinized product can be obtained after removing the pre-plasticized dispersant. In the present invention, a modifying agent can be added in the starch gelatinization process to carry out one-step modification reaction, the preparation method is simple, the prepared starch-based biodegradable material has good melt processing fluidity, high tensile strength retention rate, and can be stored for a long time. The process has good hydrophobicity.

Description

[0001] This application claims the priority of the Chinese patent application CN2018104827967 with the filing date of May 18, 2018. This application cites the full text of the above-mentioned Chinese patent application. technical field [0002] The invention relates to a method and a product for preparing a thermoplastic starch biodegradable material from a supercritical fluid. Background technique [0003] Supercritical fluids (Supercritical fluids, SCF) is a special state of fluid formed when a substance is above its critical temperature and pressure. This kind of fluid has the properties of both gas and liquid, such as diffusion coefficient, high density, low viscosity, good heat transfer and mass transfer characteristics, and its physical parameters such as density, dielectric constant and solubility have a great influence on temperature and pressure near the critical point. Very sensitive. A suitable temperature or pressure can be preferred according to the specific r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/02C08K5/053C08K5/07C08K3/22
CPCC08K3/22C08K5/053C08K5/07C08K2003/2241C08L2201/06C08L3/02Y02P20/54
Inventor 陈勋森叶正涛
Owner 上海耐特复合材料制品有限公司