Degradable starch microsphere with rough surface structure, and preparation method thereof

A technology for degrading starch and rough surface is applied in the field of preparation of degradable microbeads with rough surface structure, which can solve the problems of easily broken microsphere structure of microsphere structure, poor shape stability of starch microspheres, insufficient roundness, etc. The effect of uniform distribution, low price and rounded sphere

Pending Publication Date: 2020-09-18
WENZHOU INST UNIV OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention patent with the publication number CN102008926A discloses a method for preparing starch microspheres. Although the preparation process of the starch microspheres produced by the technical scheme of the invention is simple, it can be applied to the fields of medicines, cosmetics, food modifiers, inks, and papermaking. , but the shape stability of the prepared starch microspheres is poor, the formed microsphere structure is easy to break or the formed microsphere structure is not round enough
[0004] The invention patent with the publication number CN101721965A discloses a method for preparing starch-based nano-microspheres. The starch microspheres prepared by the technical scheme of the invention have a uniform size distribution, but the surface is relatively smooth. In the field of daily chemicals, some particles need rough surfaces High-grade products such as scrub, facial cleanser, etc. are limited in application

Method used

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  • Degradable starch microsphere with rough surface structure, and preparation method thereof
  • Degradable starch microsphere with rough surface structure, and preparation method thereof
  • Degradable starch microsphere with rough surface structure, and preparation method thereof

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preparation example Construction

[0028] A preparation method of degradable starch microbeads with a rough surface structure, comprising the steps of:

[0029] Step 1. Modification of raw starch: using raw starch as raw material, using cationic etherification agent to carry out cationic etherification treatment on the raw starch, and then using esterification agent to carry out esterification treatment on the raw starch after etherification treatment;

[0030] Step ② Preparation of starch microbeads: use co-precipitation method to prepare degradable starch microbeads, dissolve the modified raw starch in step ① in an organic solvent, and then mix it with water. After the organic solvent is completely volatilized, water is obtained. After the dispersed starch microbead solution is dried, degradable starch microbeads with a rough surface structure are finally obtained.

[0031] In the step ①, the mass ratio of the native starch to the cationic etherifying agent is 10:1~10, and in the step ② the mass ratio of the ...

Embodiment 1

[0044] Step ① Modification of starch

[0045] In the embodiment of the present invention, the original starch is corn starch, the cationic etherification agent is 2, 3-epoxypropyltrimethylammonium chloride (GTA), the esterification agent is acetic anhydride, and the cationic etherification method It is a wet method; the mass ratio of raw starch: cationic etherifying agent: esterifying agent is 10:2:10; 2, 3-epoxypropyltrimethylammonium chloride etherifying agent is used, and acetic anhydride is esterified The reaction process for the preparation of modified starch is as follows:figure 1 shown.

[0046] In a 250 mL three-neck flask equipped with a reflux condenser, a stirring device and a thermometer, add the dried raw starch to a 50 mL concentration of sodium hydroxide (1%wt) solution, mix and stir at 30 ° C for 1 hour; then reverse reaction Add GTA solution (70%wt) dropwise to the system for etherification reaction; cool after the reaction, soak the product in ethanol soluti...

Embodiment 2

[0051] Step ① Modification of starch

[0052] In the embodiment of the present invention, the original starch is tapioca starch, the cationic etherification agent is 3-chloro-2-hydroxypropyltrimethylammonium chloride (CTA), the esterification agent is propionic anhydride, and the cationic etherification agent is The method is a semi-dry method; the mass ratio of raw starch: cationic etherifying agent: esterifying agent is 10:1:20.

[0053] Before the reaction, the raw starch was dried at 60 °C for 24 h to remove water. First, dissolve a certain amount of NaOH in a certain amount of water and cool to room temperature. Then add the etherifying agent (CTA) and let it stand for 5 minutes. Finally, spray the alkali solution of the etherifying agent on 10 g of tapioca starch in a stainless steel plate and stir evenly. Put it into an oven for pre-drying at 60°C for 1 h, control the water content below 14%, and then react at a specified temperature for a certain period of time. The...

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Abstract

The invention discloses a degradable starch microsphere with a rough surface structure. The degradable starch microsphere is prepared from the following raw materials: native starch, a cationic etherifying agent, an esterifying agent, an organic solvent and water, wherein the average particle size is 0.1-1 [mu]m. Surface modification is performed on the native starch in a manner of mutual cooperation of cationic etherification treatment and esterification treatment to obtain modified starch, the modified starch is dissolved in an organic solvent, the obtained solution is mixed with water, after the organic solvent is completely volatilized to obtain a water-dispersed starch microsphere solution, and drying is performed to finally obtain the degradable starch microsphere with the rough surface structure. The degradable starch microsphere prepared in the invention is round in sphere, uniform in size distribution and rough in surface structure, and is endowed with stronger cleaning performance when being applied to daily chemical products; and the raw materials are wide in source and low in price, and are renewable environment-friendly microsphere materials, so that the pollution to the environment is effectively reduced, and the production cost is saved.

Description

technical field [0001] The invention relates to the field of preparation of starch microbeads, in particular to a preparation method of degradable microbeads with a rough surface structure. Background technique [0002] The size of plastic microbeads widely used in personal care and daily chemical products for washing is between 0.1 and 1 μm. Due to the low size dimension and non-degradable nature, the main discharge route of primary plastic microbeads into the environment is after use and washing. Wastewater directly enters surface water, then migrates to rivers, lakes and oceans, and then is suspended or deposited, becoming one of the main sources of plastic waste that pollutes oceans and other water bodies. According to statistics, the annual discharge of plastic microbeads in marine garbage reaches about 950,000 tons. A large number of plastic microbeads not only endanger the survival of marine life, but also poisonous plastic microbeads will pass through the food chain ...

Claims

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Application Information

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IPC IPC(8): C08J3/16C08B31/16C08L3/04
CPCC08J3/16C08B31/16C08J2303/04
Inventor 谭颖裴小朋周华彭波
Owner WENZHOU INST UNIV OF CHINESE ACAD OF SCI
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