阅读说明：本技术 一种废粘胶膜的回收再利用方法 (Recycling method of waste adhesive film ) 是由 朱坤坤 余达山 盛永新 王友春 徐卫林 于 2020-06-24 设计创作，主要内容包括：本发明公开了一种废粘胶膜的回收再利用方法,通过将纤维素薄膜生产过程中的边角料和/或粘胶膜废料依次经切断、烘干、开松、浸泡和搅拌处理后可制得纤维素含量为1～10wt％的纤维素溶液,再进一步通过湿法纺丝技术可制备获得再生纤维素纤维。该方法不仅有助于解决粘胶厂加工废料的处理难题,同时还有助于资源的合理利用,且本发明工艺技术简单、成本低且环境友好无污染,有助于废粘胶膜的大规模回收再利用,因此是一种废旧粘胶膜回收再利用的绿色生产工艺,具有较广阔的市场应用前景。(The invention discloses a method for recycling waste viscose films, which comprises the steps of sequentially cutting off leftover materials and/or viscose film waste materials in the production process of cellulose films, drying, opening, soaking and stirring to prepare a cellulose solution with the cellulose content of 1-10 wt%, and further preparing regenerated cellulose fibers by a wet spinning technology. The method is not only beneficial to solving the problem of treatment of the processing waste materials of the viscose factory, but also beneficial to reasonable utilization of resources, and the method has the advantages of simple process technology, low cost, environmental friendliness and no pollution, and is beneficial to large-scale recycling of the waste viscose films, so that the method is a green production process for recycling the waste viscose films, and has a wide market application prospect.)

1. A method for recycling waste adhesive films is characterized by comprising the following steps:

s1, cutting the waste adhesive film;

s2, placing the cut waste viscose film obtained in the step S1 in an oven for drying;

s3, opening the dried waste viscose film obtained in the step S2 through a stirrer;

s4, immersing the opened waste viscose film obtained in the step S3 into NaOH solution at a certain temperature;

s5, stirring the alkaline leaching waste adhesive film obtained in the step S4 by a stirrer to dissolve the waste adhesive film to obtain a cellulose solution;

and S6, defoaming the fiber solution obtained in the step S5, and then preparing the regenerated cellulose fibers by a wet spinning technology.

2. The method of claim 1, wherein in step S1, the waste adhesive film is leftover bits and pieces of adhesive film waste in the production process of cellulose film.

3. The method for recycling the waste adhesive film according to claim 1, wherein in step S2, the drying temperature is 40 to 100 ℃ and the drying time is 0.1 to 24 hours.

4. The method as claimed in claim 1, wherein in step S4, the concentration of NaOH solution is 5-13 wt%.

5. The method for recycling the waste adhesive film according to claim 1, wherein in the step S4, the temperature of the NaOH solution is-2 to 15 ℃, and the soaking time is 0.5 to 24 hours.

6. The method for recycling a waste adhesive film according to claim 1, wherein in step S4, the ratio of the amount of the waste adhesive film to the amount of the NaOH solution is 2: 98-10: 90.

7. the method for recycling a waste adhesive film according to claim 1, wherein the concentration of the cellulose solution is 1 to 10% in step S5.

8. The method for recycling a waste adhesive film as claimed in claim 1, wherein the wet spinning process employs H6₂SO₄/Na₂SO₄The solution was used as a coagulation bath.

9. The method for recycling a waste adhesive film according to claim 1, wherein in step S6, H is contained in the coagulation bath solution₂SO₄The mass percentage concentration of the organic silicon compound is 5-20 wt%;

Na₂SO₄the mass percentage concentration of (B) is 5-15 wt%.

Technical Field

The invention belongs to the field of natural polymers, and also belongs to the fields of chemistry and chemical engineering, agriculture and environmental engineering, and particularly relates to a recycling method of a waste viscose film.

Background

Cellophane is a common adhesive film. The wood pulp or cotton pulp is made into solution by alkalization, squeezing, crushing, aging and yellowing, then dissolved in NaOH solution, the solution is made into solution, after ripening, impurity removal and deaeration, the solution is extruded into coagulating bath through long and narrow slits in a film drawing machine to regenerate cellulose film, and then the cellophane is made through drafting, water washing, desulfurization, bleaching, desalination, plasticization and drying. The drying process after the high-power drafting of the cellulose film is very easy to cause the curling and thickening of the two edges of the film, the film at the two edges is generally cut off and discarded to ensure the quality of the product, and the waste viscose films are treated, so that the capital investment of a viscose factory is additionally increased, and the waste of available resources is also caused.

The waste adhesive film can not be dissolved by an adhesive method, which causes the waste of the partial resources and the production cost increase of the adhesive factory caused by the waste treatment. Therefore, the development of a recycling technology of the waste adhesive film is of great significance to adhesive factories.

Disclosure of Invention

The invention aims to provide a method for recycling waste viscose films, which comprises the steps of cutting, drying, opening, soaking, stirring and dissolving the waste viscose films to prepare a cellulose solution, and preparing regenerated cellulose fibers by a wet spinning technology. The invention has simple process, low cost, environmental protection and no pollution.

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

a method for recycling waste adhesive films comprises the following steps:

s1, cutting the waste adhesive film;

s2, placing the cut waste viscose film obtained in the step S1 in an oven for drying;

s3, opening the dried waste viscose film obtained in the step S2 through a stirrer;

s4, immersing the opened waste viscose film obtained in the step S3 into NaOH solution at a certain temperature;

s5, stirring the alkaline leaching waste adhesive film obtained in the step S4 by a stirrer to dissolve the waste adhesive film to obtain a cellulose solution;

and S6, defoaming the fiber solution obtained in the step S5, and regenerating the fiber solution by a wet spinning technology to obtain the cellulose fiber.

As a further limitation of the above solution, in step S1, the waste adhesive film is leftover material and/or adhesive film waste material in the cellulose film production process.

As a further limitation of the above scheme, in step S2, the drying temperature is 40-100 ℃, and the drying time is 0.1-24 h.

As a further limitation of the above scheme, in step S4, the NaOH solution has a mass percentage concentration of 5 to 13%.

As a further limitation of the above scheme, in step S4, the temperature of the NaOH solution is-2 to 15 ℃, and the soaking time is 0.5 to 24 hours.

As a further limitation of the above scheme, in step S4, the ratio of the used adhesive film to the NaOH solution is 2: 98-10: 90.

As a further limitation of the above aspect, in step S5, the concentration of the cellulose solution is 1 to 10%.

As a further limitation of the above scheme, in step S6, the wet spinning technique employs H₂SO₄/Na₂SO₄The solution was used as a coagulation bath.

As a further limitation of the above aspect, in step S6, H is added to the coagulation bath solution₂SO₄The mass percentage concentration of the organic silicon compound is 5-20 wt%; na (Na)₂SO₄The mass percentage concentration of (B) is 5-15 wt%.

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

(1) the method successfully dissolves the industrial waste viscose film, solves the problem that the viscose factory cannot dissolve the waste viscose film, is beneficial to reducing the production cost of the viscose factory and simultaneously avoids the waste of available resources.

(2) The invention has the advantages of simple process, low energy consumption, no pollution and the like. The waste viscose film is cut, dried, opened, soaked and stirred to dissolve to obtain cellulose solution, and compared with available viscose process, the process is simple and low in power consumption. Meanwhile, the adopted solvent NaOH is low in price, non-toxic and harmless and is widely applied to industrial production, so that the solvent recovery technology is mature, high in safety and free of pollution.

(3) The cellulose solution prepared by the invention has similar components to the cellulose solution prepared by the industrial viscose method, and the wet spinning coagulating bath is the same as the viscose method (both are H)₂SO₄/Na₂SO₄Coagulation bath). Therefore, the technology can be directly applied to the existing viscose production line, is beneficial to reducing the production cost of a viscose factory, is beneficial to the rapid industrialization of the method, and has wider market application prospect.

Drawings

Fig. 1 is a process flow diagram of the recycling method of the waste adhesive film of the present invention.

FIG. 2 is a graph showing the results of tensile properties tests on the regenerated cellulose filaments obtained in example 12.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail with reference to the following embodiments; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.