阅读说明：本技术 一种可降解生物质基抑菌膜及其制备方法 (Degradable biomass-based antibacterial film and preparation method thereof ) 是由 宋晓明 高珊珊 陈夫山 于世涛 刘丹凤 徐功臣 王甲均 于 2019-10-21 设计创作，主要内容包括：本发明提供一种可降解生物质基抑菌膜及其制备方法,按质量份数计算,可降解生物质基抑菌膜的制备原料包括以下成分：壳聚糖0.5-10份、硝酸银0.01-1份、姜黄素0.05-1份、原花青素0.05-1份、淀粉6份、纤维素0.1-20份和瓜尔胶0.1-5份。制备方法包括：按照选定质量份数将壳聚糖、硝酸银、姜黄素、原花青素、淀粉、纤维素和瓜尔胶分散于水中,并进行加热搅拌,然后成膜,烘干后得到可降解生物质基抑菌膜。本发明的可降解生物质基抑菌膜及其制备方法,原料均使用可生物降解的材料,可降解生物质基抑菌膜降解率高,无毒、环保,并且薄膜拉伸强度好,同时具有很好的抑菌性能。(The invention provides a degradable biomass-based antibacterial film and a preparation method thereof, wherein the preparation raw materials of the degradable biomass-based antibacterial film comprise the following components in parts by mass: 0.5-10 parts of chitosan, 0.01-1 part of silver nitrate, 0.05-1 part of curcumin, 0.05-1 part of procyanidine, 6 parts of starch, 0.1-20 parts of cellulose and 0.1-5 parts of guar gum. The preparation method comprises the following steps: dispersing chitosan, silver nitrate, curcumin, procyanidine, starch, cellulose and guar gum in water according to selected mass parts, heating and stirring, forming a film, and drying to obtain the degradable biomass-based antibacterial film. According to the degradable biomass-based antibacterial film and the preparation method thereof, biodegradable materials are used as raw materials, the degradable biomass-based antibacterial film is high in degradation rate, non-toxic and environment-friendly, and the film is good in tensile strength and good in antibacterial performance.)

1. The degradable biomass-based antibacterial film is characterized in that the preparation raw materials of the degradable biomass-based antibacterial film comprise the following components in parts by mass: 0.5-10 parts of chitosan, 0.01-1 part of silver nitrate, 0.05-1 part of curcumin, 0.05-1 part of procyanidine, 6 parts of starch, 0.1-20 parts of cellulose and 0.1-5 parts of guar gum.

2. The degradable biomass-based antibacterial film according to claim 1, wherein the raw materials for preparing the degradable biomass-based antibacterial film comprise the following components by weight: 1-3 parts of chitosan, 0.05-0.5 part of silver nitrate, 0.1-0.5 part of curcumin, 0.1-0.5 part of procyanidine, 6 parts of starch, 0.5-10 parts of cellulose and 0.5-1 part of guar gum.

3. The degradable biomass-based antibacterial film according to claim 1 or 2, characterized in that: the cellulose is ginger stalk cellulose.

4. A method of preparing a degradable biomass-based antibacterial film according to any one of claims 1 to 3, comprising the steps of: dispersing chitosan, silver nitrate, curcumin, procyanidine, starch, cellulose and guar gum in water according to selected mass parts, heating and stirring, forming a film, and drying to obtain the degradable biomass-based antibacterial film.

5. The method for preparing a degradable biomass-based antibacterial film according to claim 4, characterized by comprising the following steps:

s1, dispersing silver nitrate and chitosan in a solvent to obtain a dispersion liquid of the silver nitrate and the chitosan, heating the dispersion liquid of the silver nitrate and the chitosan to react, and then drying and grinding a product into powder to obtain silver nitrate-loaded chitosan;

s2, dispersing starch in water, heating and stirring to obtain a starch dispersion liquid;

s3, pulping the cellulose, and dispersing the cellulose in water to obtain a cellulose dispersion liquid;

s4, adding the silver nitrate-loaded chitosan obtained in the step S1 and the cellulose dispersion liquid obtained in the step S3 into the starch dispersion liquid obtained in the step S2, adding guar gum, curcumin and procyanidine, heating and stirring to obtain a reaction liquid, scraping the reaction liquid into a film, and drying to obtain the degradable biomass-based antibacterial film.

6. The method of preparing a degradable biomass-based antibacterial film according to claim 5, wherein: in step S1, the concentration of silver nitrate in the dispersion of silver nitrate and chitosan is 0.01-0.02 mol/L.

7. The method of preparing a degradable biomass-based antibacterial film according to claim 5, wherein: in step S1, the dispersion of silver nitrate and chitosan is heated to 50-70 ℃ and reacted for 24-48 h.

8. The method of preparing a degradable biomass-based antibacterial film according to claim 5, wherein: in step S2, dispersing starch in water, heating to 60-100 deg.C, and stirring for 10-60 min.

9. The method of preparing a degradable biomass-based antibacterial film according to claim 5, wherein: in the step S3, pulping the cellulose until the pulping degree is 40-80 degrees SR; the mass concentration of the cellulose after being dispersed in water is 0.05-0.1%.

10. The method of preparing a degradable biomass-based antibacterial film according to claim 5, wherein: in step S4, the heating temperature for heating and stirring is 60-70 deg.C, and the time is 5-30 min.

Technical Field

The invention belongs to the technical field of antibacterial film materials, and particularly relates to a degradable biomass-based antibacterial film and a preparation method thereof.

Background

With the increase of environmental awareness of people, plastic products, especially plastic packaging bags and other materials will gradually exit the market. The plastic waste cannot generate economic benefit, causes the environmental pollution to be aggravated, and affects the health of residents, so that each country takes stricter plastic waste management and import restriction measures in 2018, and many countries start to limit plastic comprehensively. Under the current large trend of environmental protection, the renewable biomass resources are explored to prepare the degradable packaging materials to replace plastic products, so that the method has important practical significance for relieving the increasingly serious crisis of fossil resources and solving the problem of shortage of the packaging materials under the large background of plastic limit, and is a powerful way for solving the current predicament. The natural biomass such as starch, fiber, chitosan, guar gum and the like is renewable natural resources in nature, has the performances of no toxicity, renewability, degradability and the like, and can not cause environmental pollution and harm when being discarded in the environment, so the natural biomass can be used as a substitute of plastics.

Chinese patent document CN105885115A discloses a cellulose-reinforced caprolactone-starch degradable film, which uses corn starch, sweet potato starch, cellulose and the like as raw materials, can be biologically degraded, and has little harm to the environment, but the degradable film only has the performance of a common film, does not have other performances such as bacteriostasis and the like, and cannot meet the requirement of a food packaging film on the bacteriostasis performance when being used for a food packaging film.

Disclosure of Invention

The invention aims to provide a degradable biomass-based antibacterial film and a preparation method thereof, wherein biodegradable materials are used as raw materials, the degradable biomass-based antibacterial film is high in degradation rate, non-toxic, environment-friendly, good in tensile strength and good in antibacterial performance.

In order to solve the problems, the invention provides a degradable biomass-based antibacterial film, which comprises the following raw materials in parts by mass: 0.5-10 parts of chitosan, 0.01-1 part of silver nitrate, 0.05-1 part of curcumin, 0.05-1 part of procyanidine, 6 parts of starch, 0.1-20 parts of cellulose and 0.1-5 parts of guar gum.

Preferably, the preparation raw materials of the degradable biomass-based antibacterial film comprise the following components in parts by weight: 1-3 parts of chitosan, 0.05-0.5 part of silver nitrate, 0.1-0.5 part of curcumin, 0.1-0.5 part of procyanidine, 6 parts of starch, 0.5-10 parts of cellulose and 0.5-1 part of guar gum.

Preferably, the cellulose is ginger stalk cellulose.

Preferably, the starch is tapioca cationic starch or corn starch, and further preferably, the degree of substitution of tapioca cationic starch is 0.01-0.02.

Another object of the present invention is to provide a method for preparing the above degradable biomass-based antibacterial film, which is characterized by comprising the following steps: dispersing chitosan, silver nitrate, curcumin, procyanidine, starch, cellulose and guar gum in water according to selected mass parts, heating and stirring, forming a film, and drying to obtain the degradable biomass-based antibacterial film.

Preferably, the method comprises the following steps:

s1, dispersing silver nitrate and chitosan in a solvent to obtain a dispersion liquid of the silver nitrate and the chitosan, heating the dispersion liquid of the silver nitrate and the chitosan to react, and then drying and grinding a product into powder to obtain silver nitrate-loaded chitosan;

s2, dispersing starch in water, heating and stirring to obtain a starch dispersion liquid;

s3, pulping the cellulose, and dispersing the cellulose in water to obtain a cellulose dispersion liquid;

s4, adding the silver nitrate-loaded chitosan obtained in the step S1 and the cellulose dispersion liquid obtained in the step S3 into the starch dispersion liquid obtained in the step S2, adding guar gum, curcumin and procyanidine, heating and stirring to obtain a reaction liquid, scraping the reaction liquid into a film, and drying to obtain the degradable biomass-based antibacterial film.

Preferably, in the step S1, the concentration of silver nitrate in the dispersion of silver nitrate and chitosan is 0.01-0.02 mol/L.

Preferably, in step S1, the dispersion of silver nitrate and chitosan is heated to 50-70 ℃ and reacted for 24-48 h.

Preferably, in step S1, the solvent is ethanol.

Preferably, in step S2, dispersing starch in water, heating to 60-100 deg.C, and stirring for 10-60 min; further preferably, in step S2, the starch is dispersed in water, heated to 95 ℃, and stirred for 30 min.

Preferably, in step S3, beating the cellulose to a beating degree of 40-80 ° SR; the mass concentration of the cellulose after being dispersed in water is 0.05-0.1%; preferably, in step S3, the cellulose is beaten to a freeness of 60 ° SR.

Preferably, in step S4, the heating temperature for heating and stirring is 60-70 deg.C, and the time is 5-30 min.

Preferably, in step S4, the post-film-scraping temperature of the reaction solution is 50 to 65 ℃.

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

the degradable biomass-based antibacterial film and the preparation method thereof have the advantages that the preparation raw materials comprise chitosan, silver nitrate, curcumin, procyanidine, starch, cellulose and guar gum, wherein the chitosan is a deacetylation product of chitin, the chitin is a renewable biological macromolecular substance, the chitosan is second to the cellulose in quantity in nature, and the chitosan has certain antibacterial performance and is widely applied to the fields of food preservation, fresh keeping and the like; silver ions of the silver nitrate have a strong adsorption effect on microorganisms, and partial enzyme seeds of the adsorbed microorganisms lose activity to kill the microorganisms, so that the microorganisms have a certain antibacterial property; curcumin is a yellow pigment extracted from rhizome of Curcuma rhizome of Zingiberaceae, and has antioxidant and antiinflammatory effects; the procyanidin has antioxidant, free radical scavenging, and antiinflammatory effects. According to the application, chitosan, silver nitrate, curcumin and procyanidine are used as antibacterial materials, starch, cellulose and guar gum are used as film forming materials, the chitosan, curcumin, procyanidine, starch, cellulose and guar gum in the raw materials are all biodegradable materials and are also renewable natural resources, and the film which has excellent tensile strength, degradation performance and antibacterial performance and can be used in the fields of food packaging and the like is obtained by adjusting the using amount of each component in the raw materials and the process parameters in the preparation method.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the examples below, chitosan was purchased from shanghai kungquan biotechnology limited; curcumin was purchased from sienna Baister Biotech, Inc.; procyanidins were purchased from western's high and remote biotechnology limited; guar gum was purchased from zheng zhou longxin biotechnology ltd; the rest raw materials are all sold in the market. It should be noted that the above-mentioned raw material sources are only examples, and the actual selection is not unique, and those skilled in the art can also purchase products of other manufacturers and specifications according to the actual situation, and the implementation of the technical effects of the present invention is not affected by the products of different manufacturers and specifications.