阅读说明：本技术 一种醋酸纤维素膜做包装材料使用的混合溶剂、醋酸纤维素膜软化方法以及包装方法 (Mixed solvent used by cellulose acetate film as packaging material, cellulose acetate film softening method and packaging method ) 是由 刘建平 刘子赫 贾景霞 宋霞 于 2019-10-18 设计创作，主要内容包括：本发明公开了一种醋酸纤维素膜做包装材料使用的混合溶剂,包括下述重量份组成：甲醇：6～20份、乙酸：6～20份、丙酮：1～50份、水：10～87份,先将醋酸纤维素膜溶解放入配置的混合溶液中,通过配置溶液中的溶剂,来使得醋酸纤维素膜能够处于溶胀状态。这样就可以将醋酸纤维素膜软化,从而在软化状态下对醋酸纤维素膜对包装物的表面进行贴合,之后在自然条件下晾干,本身醋酸纤维素膜在溶胀过程中,不会对分子结构造成破坏,在晾干过程中,位于分子内部的溶剂会挥发出来,这样醋酸纤维素膜就解除溶胀状态,这样醋酸纤维素膜会恢复到原来的状态,恢复到原来的力学性能,这样就可以实现通过醋酸纤维素膜完全与包装物贴合,包括折角部位能够完全贴合,无褶皱。(The invention discloses a mixed solvent used by a cellulose acetate membrane as a packaging material, which comprises the following components in parts by weight: methanol: 6-20 parts of acetic acid: 6-20 parts of acetone: 1-50 parts of water: and 10-87 parts, dissolving the cellulose acetate membrane into the prepared mixed solution, and preparing a solvent in the solution to enable the cellulose acetate membrane to be in a swelling state. Just so can soften cellulose acetate membrane, thereby laminate the surface of cellulose acetate membrane to the packing material under the softened state, later dry under natural condition, cellulose acetate membrane itself is at the swelling in-process, can not cause the destruction to molecular structure, in the in-process of drying, the solvent that is located the molecule inside can volatilize, the state of swelling is just removed to cellulose acetate membrane like this, cellulose acetate membrane can resume original state like this, resume original mechanical properties, just so can realize laminating completely with the packing material through cellulose acetate membrane, can laminate completely including dog-ear position, no fold.)

1. The mixed solvent used for the cellulose acetate film as the packaging material is characterized by comprising the following components in parts by weight:

methanol: 6 to 20 portions of

Acetic acid: 6 to 20 portions of

Acetone: 1 to 50 parts of

Water: 10-87 parts.

2. The mixed solvent used for the cellulose acetate film as the packaging material according to claim 1 is characterized by comprising the following components in parts by weight:

methanol: 9 to 15 portions of

Acetic acid: 9 to 15 portions of

Acetone: 2 to 30 portions of

Water: 40-80 parts.

3. The method for softening a fiber membrane by using a mixed solvent as claimed in claim 1 or 2, wherein the raw materials are weighed according to parts by weight and prepared into a mixed solution, and the cellulose acetate membrane is soaked in the mixed solution for 5-32 minutes.

4. The method for softening a fiber membrane according to claim 3, wherein the methanol and the acetone are firstly prepared into a mixed solution, the cellulose acetate membrane is soaked in the mixed solution for 0.5 to 10 minutes, and then the rest acetic acid and water are added for further soaking for 4.5 to 22 minutes.

5. The method for softening a fiber membrane according to claim 3 or 4, wherein the solution is prepared after the raw material is preheated to 18-35 ℃.

6. The method for softening a fiber membrane according to claim 3 or 4, wherein the softened cellulose acetate membrane is treated at-10 to 10 ℃ for 0.5 to 10 minutes after soaking in the city water.

7. A packaging method of cellulose acetate film is characterized in that: preparing methanol, acetone, acetic acid and water into a mixed solution, then placing a cellulose acetate membrane in the mixed solution for softening for 5-32 minutes, taking out the cellulose acetate membrane to coat the surface of a packing material, and airing.

8. The method for packaging a cellulose acetate film according to claim 7, wherein the softened cellulose acetate film is placed in a refrigerator at 4 ℃ for 0.5 to 10 minutes.

9. The method for packaging a cellulose acetate film according to claim 7 or 8, wherein the mixture of methanol and acetone is prepared, the cellulose acetate film is soaked for 0.5-10 minutes, and then acetic acid and water are added for continuous soaking for 4.5-22 minutes.

10. The method for packaging a cellulose acetate film according to claim 7, characterized in that: when the solution is prepared, the temperature of methanol, acetone, acetic acid and water is raised to 18-35 ℃.

Technical Field

The invention relates to the field of packaging, in particular to a mixed solvent using a cellulose acetate film as a packaging material, a cellulose acetate film softening method and a packaging method of the cellulose acetate film.

Background

The packaging film is mainly formed by the resin mixture extrusion of several kinds of different brands, has anti puncture, and super strength high performance twines the packing to the goods of stacking on the layer board, makes the packing material more firm clean and tidy, and superstrong waterproof effect is widely used, at foreign trade export, papermaking, five metals, plastics chemical industry, building materials, food and medicine trade.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a practical mixed solvent which can swell the cellulose acetate film, enables the cellulose acetate film to have certain deformation capacity and is convenient to package and is used as a packaging material.

In order to achieve the purpose, the invention provides the following technical scheme:

a mixed solvent used for cellulose acetate film as a packaging material comprises the following components in parts by weight:

methanol: 6 to 20 portions of

Acetic acid: 6 to 20 portions of

Acetone: 1 to 50 parts of

Water: 10-87 parts.

As a further modification of the invention:

methanol: 9 to 15 portions of

Acetic acid: 9 to 15 portions of

Acetone: 2 to 30 portions of

Water: 40-80 parts.

The invention also provides a method for softening the fiber membrane by using the mixed solvent, which comprises the steps of weighing the raw materials according to the parts by weight, preparing the raw materials into a mixed solution, and soaking the cellulose acetate membrane in the mixed solution for 5-32 minutes.

As a further improvement of the invention: firstly, preparing methanol and acetone into a mixed solution, soaking the cellulose acetate membrane for 0.5-10 minutes, then adding the residual acetic acid and water, and continuing to soak for 4.5-22 minutes.

As a further improvement of the invention: preheating the raw materials to 18-35 ℃ and then preparing the solution.

As a further improvement of the invention: and after soaking in the city, treating the softened cellulose acetate film at-10 to 10 ℃ for 0.5 to 10 minutes.

Another object of the present invention is to provide a method for packaging a cellulose acetate film, which comprises preparing a mixed solution of methanol, acetone, acetic acid and water, placing the cellulose acetate film in the mixed solution, softening for 5-32 minutes, taking out the cellulose acetate film to coat on the surface of a package, and drying in the air.

As a further improvement of the invention: and (3) putting the softened cellulose acetate film in a refrigerator at 4 ℃ for 0.5-10 minutes. As a further improvement of the invention: firstly, preparing methanol and acetone into a mixed solution, soaking the cellulose acetate membrane for 0.5-10 minutes, then adding acetic acid and water, and continuing to soak for 4.5-22 minutes.

As a further improvement of the invention: when the solution is prepared, the temperature of methanol, acetone, acetic acid and water is raised to 18-35 ℃.

In the invention, the cellulose acetate film can be dissolved in partial solvent, such as cellulose acetate and cellulose nitrate, and can be dissolved in organic solvent such as acetone, dimethyl sulfoxide, etc., but in these solvents, cellulose acetate belongs to macromolecule, and in the dissolution overlong period, the cellulose acetate can swell first, then dissolve, and then swell overlength, the molecules of cellulose acetate can be kept intact without being destroyed, and once dissolution occurs, irreversible destruction can be caused to cellulose acetate, and the cellulose acetate can be completely dissolved.

Therefore, the essence of the invention is that the cellulose acetate film is firstly dissolved and put into the prepared mixed solution, and the solvent in the solution is prepared, so that the cellulose acetate film can be in a swelling state. Just so can soften cellulose acetate membrane, thereby laminate the surface of cellulose acetate membrane to the packing material under the softened state, later dry under natural condition, cellulose acetate membrane itself is at the swelling in-process, can not cause the destruction to molecular structure, in the in-process of drying, the solvent that is located the molecule inside can volatilize, the state of swelling is just removed to cellulose acetate membrane like this, cellulose acetate membrane can resume original state like this, resume original mechanical properties, just so can realize laminating completely with the packing material through cellulose acetate membrane, also can laminate completely including dog-ear position, no fold.

In the process, the selection of the components of the mixed solution is very important, the selection of the easily soluble substances is difficult to control the swelling degree, the time of the swelling stage is easily too short, the mixed solution directly enters the dissolving stage, and if the insoluble substances are selected, the swelling time is too long, and the time for reaching the degree with certain deformation capacity is longer. Therefore, according to the invention, the mixed solution of methanol, acetic acid, acetone and water is selected, and the cellulose acetate membrane can swell within a controllable time through the specific proportion, so that the cellulose acetate membrane has a certain deformation capacity, and the packing material is packed.

Meanwhile, as a further improvement, the cellulose acetate membrane is firstly mixed by methanol and acetone, and is swelled by the mixed solution of methanol and acetone, because the cellulose acetate membrane is fast swelled in the mixture of methanol and acetone, and then acetic acid and water with relatively slow swelling rate are added to continue to swell, so that the swelling time is shortened, and the control on the swelling process of the cellulose acetate membrane is easy. Simultaneously, as further improvement, preheat the raw materials, can accelerate the swelling rate, after accomplishing the swelling, put into cold storage environment with cellulose acetate membrane and mixed solvent together and refrigerate, can help cellulose acetate's nature like this, prevent that cellulose acetate membrane is too soft, simultaneously, also can avoid the cellulose acetate membrane under the swelling state to dry excessively fast, lead to still not packing the good back cellulose acetate membrane and remove the swelling state.

Detailed Description