阅读说明：本技术 一种增强的羧甲基纤维素膜 (Reinforced carboxymethyl cellulose membrane ) 是由 曹一平 黄园 尤庆亮 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种增强的羧甲基纤维素膜,由以下方法制备而成：1、将羧甲基纤维素溶于水,配制成羧甲基纤维素溶液；2、将焦倍酸加入到羧甲基纤维素溶液中,搅拌均匀,得到混合溶液,将混合溶液倒入膜成型模具中,将膜成型模具在在20-60℃下加热6-10h,得到薄膜；3、向膜成型模具中的薄膜上滴加硝酸铁溶液,滴加完成后,去掉多余的液体,放置至薄膜完全干燥,得到所述的增强的羧甲基纤维素膜。该纤维素膜的制备方法简单,在较低的温度下就可进行,而且强度大和韧性好。(The invention discloses a reinforced carboxymethyl cellulose membrane, which is prepared by the following method: 1. dissolving carboxymethyl cellulose in water to prepare carboxymethyl cellulose solution; 2. adding the pyro-paulic acid into the carboxymethyl cellulose solution, uniformly stirring to obtain a mixed solution, pouring the mixed solution into a film forming mold, and heating the film forming mold for 6-10 hours at 20-60 ℃ to obtain a film; 3. and dropwise adding a ferric nitrate solution to the thin film in the film forming mold, removing redundant liquid after the dropwise adding is finished, and placing the thin film until the thin film is completely dried to obtain the reinforced carboxymethyl cellulose film. The preparation method of the cellulose membrane is simple, can be carried out at a lower temperature, and has high strength and good toughness.)

1. A reinforced carboxymethyl cellulose membrane, characterized by being prepared by the following method:

1.1, dissolving carboxymethyl cellulose in water to prepare carboxymethyl cellulose solution;

1.2, adding the pyro-pakcl into the carboxymethyl cellulose solution, uniformly stirring to obtain a mixed solution, pouring the mixed solution into a film forming mold, and heating the film forming mold at 20-60 ℃ for 6-10 hours to obtain a film;

and 1.3, dropwise adding a ferric nitrate solution on the thin film in the film forming mold, removing redundant liquid after dropwise adding is finished, and placing until the thin film is completely dried to obtain the reinforced carboxymethyl cellulose film.

2. The reinforced carboxymethylcellulose film of claim 1, wherein: the mass percentage concentration of the carboxymethyl cellulose solution is 1-10%.

3. The reinforced carboxymethylcellulose film of claim 1, wherein: the added mass of the pyro-acid is 2-18% of the mass of the carboxymethyl cellulose.

4. The reinforced carboxymethylcellulose film of claim 1, wherein: the concentration of the ferric nitrate is 15mg/mL, and the mass of the ferric nitrate added is 1-5% of the mass of the carboxymethyl cellulose.

Technical Field

The invention belongs to the technical field of cellulose membrane preparation, and particularly relates to an enhanced carboxymethyl cellulose membrane and application thereof.

Background

Carboxymethyl cellulose (CMC) is a derivative of carboxymethylation of cellulose, is a natural polysaccharide polymer with the largest yield and the widest application, has good biodegradability, biocompatibility and film-forming property, and is widely applied to chemical industry, food and packaging industry due to safety and non-toxicity. Carboxymethyl cellulose, a hydrophilic polysaccharide polymer, has a common CMC film quality, a brittle film, a poor moisture barrier property, and a common thermal stability.

Generally, one can modify the cellulose film by adding a modifier to improve the properties of the cellulose film. The modifier is divided into an inorganic modifier and an organic modifier, the inorganic modifier comprises inorganic reinforced particles, and common inorganic reinforced particles comprise glass fibers, graphene oxide, silicon carbide, aluminum oxide, mica, talcum powder, clay and the like.

Graphene is a simple substance of carbon, and has a two-dimensional monoatomic layer structure. The unique structure enables the graphene to integrate various excellent properties, and the graphene becomes a nano material with good mechanical property, heat conduction property, permeability and electron mobility. The graphene oxide is a product obtained after graphene is oxidized, and because the graphene oxide contains more oxygen-containing functional groups, the graphene oxide has many excellent properties of graphene and properties which graphene does not have, and the mechanical properties of the graphene oxide can be better enhanced by using the graphene oxide in the composite material.

For example, the chinese patent application "a graphene modified cellulose film and a method for preparing the same" (application No. 201710719572.9) discloses a method for modifying a cellulose film with graphene, which specifically comprises "dissolving a graphene material in an ionic liquid, adding swollen cellulose thereto, dissolving and mixing the cellulose uniformly, and then obtaining the cellulose film by film casting, water washing, plasticization and drying. The method has the advantages of complex process and troublesome operation, and cellulose and graphene materials used in the method need to be pretreated, heated and stirred in the later period, ultrasonically dispersed and spray-dried, and then subjected to film casting, washing, plasticizing and drying to obtain the cellulose film.

The organic modifier is a cross-linking agent generally used, for example, chinese patent application "a high-strength cellulose membrane and a preparation method and application thereof" (application No. 201810794984.3) discloses a method for modifying a graphene membrane, which specifically comprises: dissolving cellulose in a solvent system, adding a cross-linking agent p-benzyl dichloride to prepare a cellulose membrane casting solution, and preparing the membrane casting solution into a membrane by a phase inversion method to obtain a cellulose primary membrane; and treating the primary membrane with alkali liquor to perform etherification crosslinking reaction, and washing with deionized water to obtain the high-strength cellulose membrane. The method needs longer heating time and higher heating temperature, for example, cellulose dissolution needs to be stirred and activated for 1.5-5 h at the temperature of 130-150 ℃, and stirring needs to be carried out for 30-60min after the temperature is reduced to 80-100 ℃.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the reinforced carboxymethyl cellulose membrane and the application thereof.

The technical scheme adopted for realizing the above purpose of the invention is as follows:

a reinforced carboxymethyl cellulose membrane prepared by the following method:

1. dissolving carboxymethyl cellulose in water to prepare carboxymethyl cellulose solution;

2. adding the pyro-paulic acid into the carboxymethyl cellulose solution, uniformly stirring to obtain a mixed solution, pouring the mixed solution into a film forming mold, and heating the film forming mold for 6-10 hours at 20-60 ℃ to obtain a film;

3. and dropwise adding a ferric nitrate solution to the thin film in the film forming mold, removing redundant liquid after the dropwise adding is finished, and placing the thin film until the thin film is completely dried to obtain the reinforced carboxymethyl cellulose film.

Further, the mass percentage concentration of the carboxymethyl cellulose solution is 1-10%.

Further, the added mass of the pyro-acid is 2-18% of the mass of the carboxymethyl cellulose.

Further, the concentration of the ferric nitrate is 15mg/mL, and the mass of the ferric nitrate added is 1-4% of the mass of the carboxymethyl cellulose.

Compared with the prior art, the invention has the beneficial effects and advantages that:

1. the cellulose membrane has the advantages of simple preparation method, wide raw material source, relatively low price, few process steps, low energy consumption and low preparation cost, can be prepared at relatively low temperature, and is suitable for industrial production.

2. The cellulose membrane has high strength and good toughness, the tensile strength is up to 25.59MPa, and the elongation at break is up to 39.96%.

3. The cellulose film is electrically conductive in the presence of moisture.

Drawings

FIG. 1 is a stress-strain graph of the cellulose film prepared in example 1.

Fig. 2 is a stress-strain graph of the cellulose film prepared in comparative example 1.

Fig. 3 is a stress-strain graph of the cellulose film prepared in comparative example 2.

Fig. 4 is a stress-strain graph of the cellulose film prepared in comparative example 3.

Fig. 5 is a stress-strain graph of the cellulose film prepared in comparative example 4.

Fig. 6 is a stress-strain graph of the cellulose film prepared in comparative example 5.

Fig. 7 is a stress-strain graph of the cellulose film prepared in comparative example 6.

Detailed Description

The present invention will be described in detail with reference to specific examples.

The following examples and comparative examples used the following sources of raw materials:

carboxymethyl cellulose was purchased from alatin with a viscosity of: 800-1200 mPas;

graphene Oxide (GO) dispersion was purchased from Bailingwei technologies, Inc. at a concentration of 4 mg/ml;

pyrobenzoic acid and sodium tetraborate are both available from Aladdin, and ferric nitrate nonahydrate is available from national pharmaceutical group Chemicals, Inc.