CN113563844B

CN113563844B - Low-cost biomass-based antifogging agent and preparation method thereof

Info

Publication number: CN113563844B
Application number: CN202010354533.5A
Authority: CN
Inventors: 白静
Original assignee: Institute of Modern Physics of CAS
Current assignee: Institute of Modern Physics of CAS
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2023-08-04
Anticipated expiration: 2040-04-29
Also published as: CN113563844A

Abstract

The invention discloses a biomass-based antifogging agent and a preparation method thereof. The antifogging agent is prepared by using konjaku flour as solute and water as solvent, and a small amount of surfactant and phase regulator are added to improve the adhesion performance of the antifogging agent on partial superhydrophobic surfaces (coated glasses, automobile glass and the like). The antifogging agent can be widely applied to the fields of glasses/swimming goggles, windowpanes, automobile rearview mirrors, measuring instruments, agricultural greenhouses and the like. The solute is edible konjak, the solvent is deionized water, and the konjak food does not contain any component harmful to human bodies, is environment-friendly and has low cost; and the formula is simple, and a large amount of antifogging agent products are easy to obtain, so that the antifogging agent is very suitable for expansion and industrial production.

Description

Low-cost biomass-based antifogging agent and preparation method thereof

Technical Field

The invention belongs to the field of antifogging agents, and particularly relates to an inexpensive biomass-based antifogging agent and a preparation method thereof.

Background

Transparent base materials (such as glass, plastic and the like) are indispensable materials in daily life, work and production of people, but in the use process, fog phenomenon is often generated due to temperature difference change, so that the light transmittance and the reflectivity of a matrix are reduced, the sight is affected, inconvenience is brought to the life of people, and even danger can occur. Coating a layer of antifogging material on the surface of the transparent substrate is a relatively simple, convenient and effective method for solving the problem of fogging. The antifogging materials are hydrophilic, hydrophobic and hydrophilic-hydrophobic 3 types, and many studies are currently conducted on hydrophilic antifogging materials by people. The hydrophilic antifogging material is mainly characterized in that the wettability of the surface of a base material is improved, so that water is uniformly spread on the surface of the base material, and the light transmittance is as high as possible, thereby achieving the antifogging effect. However, the hydrophilic antifogging material prepared at present has complex formula and can be obtained through multiple steps of chemical reactions, so that the obtained antifogging agent has high cost, is not green and environment-friendly, and is difficult to produce on a large scale.

Konjak is perennial root herbaceous plant of konjak of Araceae, and has long cultivation and eating history in China. The main ingredient of konjak is glucomannan, also known as KGM. The natural high molecular soluble dietary fiber is used as an important component for producing weight-losing meal replacement foods at present, and can reduce and delay the absorption of glucose, inhibit the synthesis of fatty acid, and has no heat and satiety. The strong water absorption of konjak is ignored while the excellent characteristics of konjak are fully utilized, and the konjak flour is reported to be capable of absorbing water and expanding 80-100 times in water; in addition, konjak also has good film forming property.

Disclosure of Invention

The invention aims to provide an inexpensive biomass-based antifogging agent and a preparation method thereof.

The biomass-based antifogging agent provided by the invention is prepared from the following substances in per 100 ml: 0.01-4g of konjaku flour, 0.01-2g of surfactant, 0.001-4g of phase regulator and the balance of water.

Still further, per 100ml of biomass-based antifogging agent is made of: 0.05-2g of konjaku flour, 0.1-1g of surfactant, 0.05-2g of phase regulator and the balance of water.

Specifically, each 100ml biomass-based antifogging agent is prepared from the following substances in mass content: konjak flour 0.8g, surfactant 0.5g, phase regulator 0.1g, and the balance of water.

The preparation method of the biomass-based antifogging agent provided by the invention comprises the following steps:

1) Placing a proper amount of water into a container, adding konjaku flour into the water under stirring, and uniformly stirring at 20-25 ℃ to enable the konjaku flour to be fully swelled and dissolved, thus obtaining konjaku gel solution with the concentration of 0.01-4%; the method comprises the steps of carrying out a first treatment on the surface of the

2) Taking water as a solvent to prepare surfactant solution with the concentration of 0.1-20% (g/100 ml), and fully dissolving the surfactant under the stirring condition;

3) Preparing a phase regulator solution with the concentration of 0.01-40% (g/100 ml) by taking water as a solvent, and fully dissolving the phase regulator under the stirring condition;

4) Mixing the solutions obtained in the steps 1) to 3) according to a certain proportion, and stirring uniformly to obtain the antifogging agent product.

In the invention, the konjak flour can be general konjak flour, purified konjak flour, konjak glucomannan and other konjak crude and refined products, and the granularity has no special requirement, so long as the condition of easy swelling and dissolution is satisfied.

In the invention, the surfactant comprises a cationic surfactant, an anionic surfactant, a nonionic surfactant and an amphoteric surfactant, such as sodium dodecyl sulfate, dioctyl sodium sulfosuccinate, sodium hexadecyl benzenesulfonate, sodium glycocholate, sodium octadecyl sulfate, sodium stearate and the like, and can be dissolved in water in a certain proportion to obtain a clear and transparent solution.

In the invention, the phase regulator is ethanol or disodium ethylenediamine tetraacetate, and all reagents are industrial or analytically pure;

in the present invention, the water may be one or more of tap water, deionized water, distilled water, sterile water, etc.

The antifogging agent is prepared by using konjaku flour as solute and water as solvent, and a small amount of surfactant and phase regulator are added to improve the adhesion performance of the antifogging agent on partial superhydrophobic surfaces (coated glasses, automobile glass and the like). The antifogging agent can be widely applied to the fields of glasses/swimming goggles, windowpanes, automobile rearview mirrors, measuring instruments, agricultural greenhouses and the like.

The invention utilizes the film forming property and strong water absorbability of konjak, firstly, konjak is prepared into solution to be coated on the surface of a transparent substrate to form a layer of hydrophilic film, and when water mist is formed, the contact angle of water can be quickly reduced due to the strong water absorbability of konjak, so that the water can be uniformly spread on the surface of the substrate, thereby achieving the anti-fog effect.

The invention has the advantages that the prepared antifogging agent takes edible konjaku flour as a main component, has low cost, is green and environment-friendly, has simple formula, overcomes a plurality of defects of the existing antifogging agent, and is very suitable for industrialized mass production.

Drawings

FIG. 1 is a graph showing the antifogging effect of the antifogging agent prepared in example 1.

Fig. 2 shows the results of the glass transmittance test before and after the application of the antifogging agent.

Fig. 3 is a microstructure change chart of the antifog coating before and after repeated gas-air drying for 8 times.

Detailed Description

The present invention is illustrated by the following specific examples, but the present invention is not limited thereto, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

The experimental methods used in the following examples are conventional methods unless otherwise specified.

Materials, reagents and the like used in the examples described below are commercially available unless otherwise specified.

The quantitative tests in the following examples were all performed in triplicate, and the results were averaged.

The konjak flour used in the following examples is commercially available konjak flour.

The "%" described below means "g/100ml".

Example 1 preparation of Biomass-based antifogging Agents

1) Placing 20mL of water in a container;

2) Adding 200mg of konjak powder into the water in the step 1) under the condition of stirring, and uniformly stirring at 20-25 ℃ to enable the konjak powder to be fully swelled and dissolved to obtain konjak gel solution with the concentration of 1%;

3) Taking water as a solvent, adding a certain amount of sodium stearate, fully dissolving a surfactant under the stirring condition, and preparing 10mL of surfactant solution with the concentration of 5%;

4) Taking water as a solvent to prepare an ethanol solution with the concentration of 1%, and fully dissolving a phase regulator under the stirring condition;

5) Mixing the solutions obtained in the steps 2) to 4) according to the proportion of 8:1:1 (volume ratio), and uniformly stirring to obtain the required antifogging agent product.

6) Coating the obtained antifogging agent on a transparent glass sheet, and testing the antifogging performance of the transparent glass sheet after airing;

7) The antifogging agent-coated glass was dried by air-drying in hot water at 80℃for 1min, and the procedure was repeated 8 times, and the structural change was examined by Scanning Electron Microscopy (SEM) (see FIG. 3).

As can be seen from fig. 1, the obtained antifogging agent has good antifogging effect; as can be seen from fig. 2, after the antifogging agent is coated, the transparency of the glass is not affected; as can be seen from fig. 3, the anti-fog coating has a more compact structure after repeated use, which is more beneficial to the anti-fog effect.

Example 2

1) Placing 20mL of water in a container;

4) Taking water as a solvent to prepare an ethylene diamine tetraacetic acid disodium solution with the concentration of 1%, and fully dissolving a phase regulator under the stirring condition;

5) Mixing the solutions obtained in the steps 2) to 4) according to the proportion of 8:1:1 (volume ratio), and uniformly stirring to obtain the antifogging agent product.

7) The glass coated with the antifogging agent is dried after being aerated on hot water with the temperature of 80 ℃ for 1min, and the glass has good antifogging effect.

Claims

1. A biomass-based antifogging agent, each 100ml biomass-based antifogging agent being made of: 0.01-4g of konjaku flour, 0.01-2g of surfactant, 0.001-4g of phase regulator and the balance of water;

the phase regulator is ethanol or disodium ethylenediamine tetraacetate.

2. The biomass-based antifogging agent according to claim 1, characterized in that: the biomass-based antifogging agent was made per 100ml of biomass: 0.05-2g of konjaku flour, 0.1-1g of surfactant, 0.05-2g of phase regulator and the balance of water.

3. The biomass-based antifogging agent according to claim 1 or 2, characterized in that: the konjaku flour is selected from any one of the following: common konjaku flour, purified konjaku flour and konjaku glucomannan.

4. The biomass-based antifogging agent according to claim 1 or 2, characterized in that: the surfactant includes cationic surfactant, anionic surfactant, nonionic surfactant and amphoteric surfactant.

5. The biomass-based antifogging agent according to claim 1 or 2, characterized in that: the water is one or more of tap water, deionized water, distilled water and sterile water.

6. A method for preparing the biomass-based antifogging agent according to any one of claims 1 to 5, comprising the steps of:

1) Placing a proper amount of water into a container, adding konjaku flour into the water under stirring, and uniformly stirring at 20-25 ℃ to enable the konjaku flour to be fully swelled and dissolved;

2) Water is used as solvent to prepare surfactant solution with concentration of 0.1-20%;

3) Water is used as solvent to prepare a phase regulator solution with the concentration of 0.01-40%;

4) And (3) mixing the solutions obtained in the steps 1) to 3) in proportion, and uniformly stirring to obtain the biomass-based antifogging agent.