阅读说明：本技术 一种水溶性膜及制备方法 (Water-soluble film and preparation method thereof ) 是由 黄永新 于 2020-05-28 设计创作，主要内容包括：本发明涉及一种水溶性膜及制备方法,属于膜加工技术领域；由以下重量份的组分组成：天然纤维素30-70份、丙三醇8-30份、水15-17份、羧甲基纤维素纳1-5份、苯甲酸0.1-1.5份、二苯甲酮0.1-1份、二氧化钛0.5-3份、防粘连剂1-10份、增挺剂1-15份、直链淀粉5-20份；制备方法：(1)物料混合：将天然纤维素、羧甲基纤维素纳、二苯甲酮、二氧化钛、直链淀粉放入混合机中搅拌；加入丙三醇、水、苯甲酸、防粘连剂、增挺剂,经高速混合机加温进行混合；(2)挤出：将混合物料通过喂料机加入挤出机,挤出造粒；(3)吹膜：采用单螺杆挤出机对步骤(2)得到的颗粒进行吹膜,得到薄膜厚度为22~28μm；本发明原料天然,方法简单,制备的产品具有很好的阻隔性,水溶性,且成本低,节能环保。(The invention relates to a water-soluble film and a preparation method thereof, belonging to the technical field of film processing; the composition comprises the following components in parts by weight: 30-70 parts of natural cellulose, 8-30 parts of glycerol, 15-17 parts of water, 1-5 parts of sodium carboxymethyl cellulose, 0.1-1.5 parts of benzoic acid, 0.1-1 part of benzophenone, 0.5-3 parts of titanium dioxide, 1-10 parts of an anti-adhesion agent, 1-15 parts of a stiffness increasing agent and 5-20 parts of amylose; the preparation method comprises the following steps: (1) mixing materials: putting natural cellulose, sodium carboxymethyl cellulose, benzophenone, titanium dioxide and amylose into a mixer and stirring; adding glycerol, water, benzoic acid, an anti-adhesion agent and a stiffness increasing agent, and heating and mixing by a high-speed mixer; (2) extruding: adding the mixed material into an extruder through a feeder, and extruding and granulating; (3) film blowing: blowing a film on the particles obtained in the step (2) by using a single-screw extruder to obtain a film with the thickness of 22-28 mu m; the invention has natural raw materials and simple method, and the prepared product has good barrier property, water solubility, low cost, energy saving and environmental protection.)

1. A water-soluble film characterized by: the composition is prepared from the following components in parts by weight:

30-70 parts of natural cellulose, 8-30 parts of glycerol, 15-17 parts of water, 1-5 parts of sodium carboxymethyl cellulose, 0.1-1.5 parts of benzoic acid, 0.1-1 part of benzophenone, 0.5-3 parts of titanium dioxide, 1-10 parts of an anti-adhesion agent, 1-15 parts of a stiffness increasing agent and 5-20 parts of amylose.

2. The water-soluble film according to claim 1, wherein: the natural cellulose is one or more of maltose cellulose, corn starch cellulose, sugarcane starch cellulose and potato starch cellulose.

3. The water-soluble film according to claim 2, wherein: the mesh number of the corn starch cellulose, the sugarcane starch cellulose and the potato starch cellulose is 1600-2000 meshes.

4. The water-soluble film according to claim 1, wherein: the anti-blocking agent is mono-diglycerol fatty acid ester.

5. The water-soluble film according to claim 1, wherein: the stiffness increasing agent is dioctyl phthalate.

6. The water-soluble film according to claim 1, wherein: the amylose ratio of the amylose is more than 50%.

7. A method of making the water-soluble film of claim 1, wherein: the method comprises the following steps:

(1) mixing materials: putting 30-70 parts of natural cellulose, 1-5 parts of sodium carboxymethyl cellulose, 0.1-1 part of benzophenone, 0.5-3 parts of titanium dioxide and 5-20 parts of amylose into a high-speed mixer, stirring at the rotating speed of 70-150r/min for 10-20 min; then adding 8-30 parts of glycerol, 15-17 parts of water, 0.1-1.5 parts of benzoic acid, 1-10 parts of anti-blocking agent and 1-15 parts of stiffness increasing agent, heating to 70-90 ℃ by a high-speed mixer, mixing at the rotation speed of 300r/min, and stirring for 20-45 min;

(2) extruding: adding the mixed material prepared in the step (1) into an extruder through a feeder, and performing extrusion granulation;

(3) film blowing: the length-diameter ratio is 1: and (3) blowing a film on the particles obtained in the step (2) by using a single-screw extruder of 36 to obtain a film with the thickness of 22-28 mu m.

8. The method for producing a water-soluble film according to claim 7, wherein: the rotating speed of the feeder in the step (2) is 10-30r/min, the rotating speed of a screw of the extruder is 50-100r/min, and the working temperature of the extruder is 85-110 ℃.

9. The method for producing a water-soluble film according to claim 7, wherein: the working temperature of the single-screw extruder in the step (3) is 100-: 4 to 8, and the drawing speed is 1.6 to 2.4 m/min.

Technical Field

The invention relates to a water-soluble film and a preparation method thereof, belonging to the technical field of film processing.

Background

The water-soluble film is made of a water-soluble high polymer material which can be quickly dissolved in water by a specific film forming process, is a novel water-soluble degradable green packaging material, and has the characteristics of environmental protection, easy dissolution, safety, no toxicity, oil resistance, corrosion resistance, static electricity prevention, elastic tensile resistance, random packaging, accurate metering, strong heat sealability, ventilation, oxygen resistance, clear printing and high anti-counterfeiting performance. Water-soluble films are widely used in countries such as europe, america, japan, and the like for packaging products for use in water, such as agricultural chemicals, fertilizers, pigments, dyes, detergents, water treatment agents, mineral additives, detergents, and concrete additives. In addition, the fabric can also be used as a garbage bag or a laundry bag of medical polluted fabrics; the film is used as a water transfer blank film and a temporary protective film; the anti-fake label is used as an anti-fake intelligent label to prevent the product from mixing moisture and the like. The manufacturers mainly adopt the casting method and the blow molding method to produce the water-soluble film, and mainly adopt Japan, America, France, Korea and the like to produce and sell such products, such as GREENSOL of France, TECHNOLOGY PARTNERS (W.T.P) of WORDWIDE, Japan, synthetic chemical company of Japan and the like.

Typical water-soluble films include polyvinyl alcohol (PVA) films, polyethylene oxide (PEO) films, methylcellulose and other edible starch films, and the like, the components are C, H, O compounds, so the water-soluble film is safe and nontoxic, only physical dissolution occurs among the components in the film preparation process, the physical property, the mechanical property, the process property and the water-soluble property of the water-soluble film are improved, but no chemical reaction occurs and the chemical property of the water-soluble film is not changed. PVA films are currently the most widely used water-soluble films in the packaging field. However, since PVA contains a large number of hydroxyl groups in its molecule and is easily decomposed in a molten state, it is difficult to blow a film directly from the PVA material. Besides being difficult to process, PVA has poor moisture resistance and has a certain vinegar taste. Polyethylene oxide (PEO) becomes a film material with great development prospect due to good water solubility and hot processing performance, has wider application range and bacteriostasis, and has better application prospect in the medical industry. The foreign patent US2001/0003613a1 mentions low molecular weight PEO (less than 30 million) which, although it can be processed into a film, has a low mechanical strength. PEO (30 million or more) having a high molecular weight has a high melt viscosity and is difficult to stretch-mold, and only a sheet having a thickness of 70 μm or more can be obtained. At present, relatively few researches are carried out on the development of a soluble film by taking cellulose and other edible starch films as raw materials, and reports are also rarely seen.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the water-soluble film and the preparation method thereof, the raw materials are natural, the method is simple, and the prepared product has good barrier property, water solubility, low cost, energy conservation and environmental protection.

In order to achieve the purpose, the invention adopts the technical scheme that:

a water-soluble film is prepared from the following components in parts by weight:

30-70 parts of natural cellulose, 8-30 parts of glycerol, 15-17 parts of water, 1-5 parts of sodium carboxymethyl cellulose, 0.1-1.5 parts of benzoic acid, 0.1-1 part of benzophenone, 0.5-3 parts of titanium dioxide, 1-10 parts of an anti-adhesion agent, 1-15 parts of a stiffness increasing agent and 5-20 parts of amylose;

the natural cellulose is one or a composition of more than two of maltose cellulose, corn starch cellulose, sugarcane starch cellulose and potato starch cellulose, wherein the mesh number of the corn starch cellulose, the sugarcane starch cellulose and the potato starch cellulose is 1600-2000 meshes;

the anti-blocking agent is mono-diglycerol fatty acid ester;

the stiffness increasing agent is dioctyl phthalate;

the amylose ratio of the amylose is more than 50%.

Another object of the present invention is to provide a method for preparing a water-soluble film, comprising the steps of:

(1) mixing materials: putting 30-70 parts of natural cellulose, 1-5 parts of sodium carboxymethyl cellulose, 0.1-1 part of benzophenone, 0.5-3 parts of titanium dioxide and 5-20 parts of amylose into a high-speed mixer, stirring at the rotating speed of 70-150r/min for 10-20 min; then adding 8-30 parts of glycerol, 15-17 parts of water, 0.1-1.5 parts of benzoic acid, 1-10 parts of anti-blocking agent and 1-15 parts of stiffness increasing agent, heating to 70-90 ℃ by a high-speed mixer, mixing at the rotation speed of 300r/min, and stirring for 20-45 min;

(2) extruding: adding the mixed material prepared in the step (1) into an extruder through a feeder, and performing extrusion granulation;

(3) film blowing: the length-diameter ratio is 1: blowing a film on the particles obtained in the step (2) by using a single-screw extruder of 36 to obtain a film with the thickness of 22-28 mu m;

the rotating speed of the feeding machine in the step (2) is 10-30r/min, the rotating speed of a screw of an extruder is 50-100r/min, and the working temperature of the extruder is 85-110 ℃;

the working temperature of the single-screw extruder in the step (3) is 100-: 4 to 8, and the drawing speed is 1.6 to 2.4 m/min.

The invention has the beneficial effects that:

(1) the adopted raw materials have good compatibility, dispersibility and durability, and the prepared product has good performance and good barrier property to oxygen, nitrogen, hydrogen and carbon dioxide, so that the components and the smell of the packaged product can be well maintained.

(2) The water-soluble film prepared by the method has good water-soluble effect and high degradation speed.

(3) The method is simple, low in cost, energy-saving and environment-friendly, and is suitable for industrial popularization.

Detailed Description

The present invention is further illustrated in detail by the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.