CN113831605B

CN113831605B - Starch-based composite material with ultraviolet shielding and blue light blocking functions and preparation method thereof

Info

Publication number: CN113831605B
Application number: CN202111065430.8A
Authority: CN
Inventors: 邹志明; 余劲灵; 胡文凯; 黎惠敏; 李和平
Original assignee: Guilin University of Technology
Current assignee: Guilin University of Technology
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-09-30
Anticipated expiration: 2041-09-13
Also published as: CN113831605A

Abstract

The invention belongs to the technical field of polymer composite materials, and particularly relates to a starch-based composite material with ultraviolet shielding and blue light blocking functions and a preparation method thereof. The composite material of the invention takes thermoplastic starch as a base material and sodium abietate as a filler. The invention also provides a preparation method of the composite material, and the prepared starch-based composite material has excellent ultraviolet shielding performance, high-energy short-wave blue light blocking performance, toughness, fluorescence and low hygroscopicity, is simple and environment-friendly in preparation process, low in cost, suitable for amplification production, and has good application prospects in the fields of packaging, ultraviolet protection and the like.

Description

Starch-based composite material with ultraviolet shielding and blue light blocking functions and preparation method thereof

Technical Field

The invention belongs to the technical field of polymer composite materials, and particularly relates to a starch-based composite material with ultraviolet shielding and blue light blocking functions and a preparation method thereof.

Background

Starch is a natural high molecular compound and is one of the most effective natural degradable materials in the world. The use of starch has shown interest in the food and non-food industries due to its abundance, cheapness, biodegradability and non-toxic properties. In order to make starch plastic like petroleum-based polymers, plasticizers are usually added to starch, resulting in thermoplastic starch. However, thermoplastic starch is easily hygroscopic and has poor toughness, and at the same time, does not have ultraviolet shielding property and high-energy short-wave blue light blocking property, which is not favorable for the application in the field of protection or food packaging. Therefore, the ultraviolet shielding performance, the high-energy short-wave blue light blocking performance and the toughness of the thermoplastic starch-based material are improved, and the application field of the thermoplastic starch-based material is widened.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a starch-based composite material with ultraviolet shielding and blue light blocking functions and a preparation method thereof by using thermoplastic starch as a base material and sodium abietate as a filler.

In order to achieve the purpose, the technical scheme of the invention is as follows: a starch-based composite material with ultraviolet shielding and blue light blocking functions and a preparation method thereof specifically comprise the following steps:

(1) adding starch and a plasticizer into deionized water, stirring at room temperature, heating, stirring and dissolving to obtain a starch solution for later use;

(2) dispersing sodium abietate in deionized water, and stirring and mixing uniformly to obtain a sodium abietate solution for later use;

(3) and (3) adding the sodium abietate solution obtained in the step (2) into the starch solution obtained in the step (1), heating and stirring to obtain a uniform film forming solution, pouring the film forming solution onto an organic glass dish, and drying in a constant-temperature vacuum oven to obtain the starch-based composite material with the ultraviolet shielding and blue light blocking functions.

Preferably, in the step (1), the starch is cationic starch, the plasticizer is glycerol, the starch, the plasticizer and the deionized water are 90 parts, 10 parts and 1600 parts by weight respectively, the stirring time is 30min at room temperature, the heating, stirring and dissolving temperature is 85 ℃, and the time is 1 h.

Preferably, in the step (2), the mass parts of the sodium abietate and the deionized water are 3-9 parts and 1200 parts respectively.

Preferably, the heating and stirring in the step (3) are carried out at 85 ℃ for 1 hour, at 50 ℃ for 24 hours.

Compared with the prior art, the invention has the following beneficial effects:

the starch-based composite material prepared by the invention has excellent ultraviolet shielding performance, high-energy short-wave blue light blocking performance, toughness, fluorescence and low hygroscopicity, and the preparation process is simple and environment-friendly, has low cost and is suitable for large-scale production.

Detailed Description

In order to better explain the invention, the invention is explained in further detail below with reference to specific examples, but the embodiments of the invention are not limited thereto. In the following specific examples and comparative example formulations, preparation procedures, the starches are cationic starches available from eastern food of Dongguan, Inc.; glycerol (glycerin) is an analytical grade reagent provided by west longa science corporation.

Example 1

(1) Adding 90 parts by mass of starch and 10 parts by mass of glycerol into 1600 parts by mass of deionized water, stirring at room temperature for 30min, heating to 85 ℃, and stirring for dissolving for 1h to obtain a starch solution for later use;

(2) dispersing 3 parts by mass of sodium abietate in 1200 parts by mass of deionized water, and uniformly stirring and mixing to obtain a sodium abietate solution for later use;

(3) and (3) adding the sodium abietate solution obtained in the step (2) into the starch solution obtained in the step (1), heating to 85 ℃, stirring for 1h to obtain a uniform film forming solution, pouring the film forming solution onto an organic glass dish, and drying in a constant-temperature vacuum oven at 50 ℃ for 24h to obtain the starch-based composite material with the ultraviolet shielding and blue light blocking functions.

Example 2

(2) dispersing 6 parts by mass of sodium abietate in 1200 parts by mass of deionized water, and uniformly stirring and mixing to obtain a sodium abietate solution for later use;

(3) and (3) adding the sodium abietate solution obtained in the step (2) into the starch solution obtained in the step (1), heating to 85 ℃, stirring for 1h to obtain a uniform film forming solution, pouring the film forming solution onto an organic glass dish, and drying in a constant-temperature vacuum oven at 50 ℃ for 24h to obtain the starch-based composite material with ultraviolet shielding and blue light blocking functions.

Example 3

(2) dispersing 9 parts by mass of sodium abietate in 1200 parts by mass of deionized water, and uniformly stirring and mixing to obtain a sodium abietate solution for later use;

Comparative example 1

As a comparative standard to the above examples, the present invention provides a thermoplastic starch material prepared without sodium abietate comprising the steps of:

(1) adding 90 parts of starch and 10 parts of glycerol into 1600 parts of deionized water, stirring at room temperature for 30min, heating to 85 ℃, and stirring for dissolving for 1h to obtain a starch solution for later use;

(2) adding 1200 parts of deionized water into the starch solution obtained in the step (1), and stirring for 1h at 85 ℃ to obtain uniform film forming liquid;

(3) and (3) pouring the film forming liquid in the step (2) onto an organic glass dish, and drying in a vacuum oven at 50 ℃ for 24 hours to obtain the thermoplastic starch material.

And (3) testing structure and performance:

performing performance tests on the thermoplastic starch film material prepared in the comparative example and the starch-based composite film material prepared in the example, wherein the ultraviolet and visible performance is tested by using an ultraviolet spectrophotometer (TU-1901, Beijing general analysis general instruments, Ltd.), and the average transmittance of ultraviolet rays (UVA, UVB and UVC) is calculated by referring to GB/T18830-2009; the fluorescence properties were measured using a Hitachi fluorescence spectrophotometer (F-7000FL) and the sample was excited with an excitation wavelength of 395 nm.

The hygroscopicity test method is as follows:

a film sample having dimensions of 20mm by 0.1mm was placed in a vacuum drying oven at 105 ℃ and, after drying for 3 hours, the mass of the film sample (noted as M) ₀ ) (ii) a Then, the dried film sample was placed in a closed container at a relative humidity of 75% and a temperature of 25 ℃ for 48 hours, and the mass (denoted as M) of the film sample was measured ₁ ) (ii) a Moisture absorption (%) of the film sample was 100*(M ₁ -M ₀ )/M ₀ 。

The above performance test data are shown in table 1.

Table 1 performance test data

As can be seen from Table 1, the starch-based composite material prepared by the method has excellent ultraviolet shielding performance, high-energy short-wave blue light barrier property, toughness, fluorescence and low hygroscopicity, and the application field of the starch-based composite material is expanded.

The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.

Claims

1. A preparation method of a starch-based composite material with ultraviolet shielding and blue light blocking functions is characterized by comprising the following steps:

2. The preparation method of the starch-based composite material with the ultraviolet shielding and blue light blocking functions according to claim 1, wherein the starch in the step (1) is cationic starch, the plasticizer is glycerol, the mass parts of the starch, the plasticizer and the deionized water are 90 parts, 10 parts and 1600 parts, respectively, the stirring time is 30min at room temperature, the heating, stirring and dissolving temperature is 85 ℃, and the time is 1 h.

3. The preparation method of the starch-based composite material with the ultraviolet shielding and blue light blocking functions according to claim 1, wherein the sodium abietate and the deionized water in the step (2) are respectively 3-9 parts and 1200 parts by weight.

4. The method for preparing the starch-based composite material with the functions of shielding ultraviolet light and blocking blue light according to claim 1, wherein the heating and stirring in the step (3) are performed at 85 ℃ for 1 hour, at 50 ℃ for 24 hours.