Stretching film for medicament packaging and preparation method thereof

Abstract

The invention provides a stretch film for medicament packaging, the stretch film is formed by combining an outer surface layer, an intermediate layer and an inner surface layer, and the thickness ratio of the outer surface layer to the intermediate layer to the inner surface layer of the stretch film is 1: 2: 1.5; the outer surface layer of the stretching film is prepared from polyethylene, an anti-sticking agent, thermoplastic resin and modified polytetrafluoroethylene, the intermediate layer of the stretching film is prepared from co-polypropylene and a slipping agent, and the inner surface layer of the stretching film is prepared from co-polypropylene, the slipping agent and the anti-sticking agent. Through cooperative arrangement of all the structures, the improved stretching film has good wear resistance, acid and alkali resistance, high tensile strength and the like, the practicability of the improved stretching film is improved, and the service life of the improved stretching film is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field related to stretch film preparation, and in particular to a stretch film for medicine packaging and a preparation method thereof. Background Art

[0002] With the progress of my country's economic construction and the development of health care, the traditional equipment, facilities and service concepts of medical institutions can no longer meet the needs of the development of the situation. At present, all large and medium-sized medical institutions have fully adopted computer systems to realize hospital management. In order to solve the problem of manual operation of pharmacists to package medicines and provide patients with more, faster and better services, medicine packaging systems specially used by medical institutions have appeared on the market. When packaging medicines, medicine packaging films are often needed.

[0003] At present, some drugs on the market are packaged with ordinary packaging films, which have poor abrasion resistance and acid and alkali resistance. It is easy to have scratches on the surface of the packaging film, which can easily damage the internal drugs and reduce their practicality.

[0004] Therefore, based on the above problems, the present invention provides a stretch film for pharmaceutical packaging. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a stretch film for pharmaceutical packaging and a preparation method thereof, which solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A stretch film for medicine packaging, the stretch film is composed of an outer surface layer, an intermediate layer and an inner surface layer, and the thickness ratio of the three layers of the stretch film is 1:2:1.5 for the outer surface layer: the intermediate layer: the inner surface layer;

[0008] The outer surface layer of the stretch film is composed of polyethylene, anti-sticking agent, thermoplastic resin, and modified polytetrafluoroethylene, the intermediate layer of the stretch film is composed of copolymerized polypropylene and a lubricant, and the inner surface layer of the stretch film is composed of a combination of copolymerized polypropylene, a lubricant, and an anti-sticking agent.

[0009] Furthermore, the total thickness of the three layers of the stretched film is thirty microns.

[0010] Furthermore, the stretched film is stretched by either biaxial stretching or uniaxial stretching.

[0011] Furthermore, the stretch film is produced by a co-extrusion casting method using three layers including an outer surface layer, an intermediate layer and an inner surface layer.

[0012] The present invention also provides a method for preparing a stretch film for medicine packaging, wherein the thermoplastic resin is any one of a polyolefin resin and an olefin thermoplastic elastomer or a mixture of the two.

[0013] The present invention also provides a method for preparing a stretch film for pharmaceutical packaging, wherein the modified polytetrafluoroethylene emulsion is composed of the following raw materials in optimal weight parts, 50 parts of deionized water, 40 parts of polytetrafluoroethylene monomer, 1 part of dispersant, 0.5 parts of emulsifier, and 1 part of improver, and the preparation steps of the modified polytetrafluoroethylene emulsion are as follows:

[0014] Step 1: adding deionized water, polytetrafluoroethylene monomer, dispersant, emulsifier, etc. into a reaction container according to a proportion and uniformly mixing and stirring to obtain a mixed solution 1;

[0015] Step 2: Adding the modifier to the mixed solution 1 and continuing stirring to obtain solution 2, i.e., modified polytetrafluoroethylene emulsion.

[0016] Furthermore, in the step 1, the stirring time is 20 min and the temperature is 50°C.

[0017] Furthermore, the stirring time in step 2 is continued for 2 hours.

[0018] The present invention provides a stretch film for medicine packaging and a preparation method thereof. Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention adds a thermoplastic resin when preparing the stretch film. Since the thermoplastic resin has excellent elasticity, a certain friction coefficient, high wear resistance, good mechanical strength, high tensile strength, and low water absorption, it can maintain stable mechanical properties in a humid environment and has good acid and alkali resistance. It can effectively improve the wear resistance, acid and alkali resistance, mechanical properties and other properties of the stretch film, thereby improving the practicality of the improved stretch film and increasing its service life;

[0020] 2. The present invention adds modified polytetrafluoroethylene emulsion to the existing stretched film. Since the modifier is added to the polytetrafluoroethylene emulsion, the overall structure of the existing polytetrafluoroethylene can be changed, the crystallinity of the system can be reduced, and the improved polytetrafluoroethylene stretched film has good stretching properties. At the same time, it has a smaller pore size, which is beneficial to improving the quality of the overall stretched film. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1

[0023] In order to solve the technical problems in the background technology, a stretch film for pharmaceutical packaging and a preparation method thereof are provided as follows:

[0024] The present invention provides a stretch film for medicine packaging, wherein the stretch film is composed of an outer surface layer, an intermediate layer and an inner surface layer, and the thickness ratio of the three layers of the stretch film is 1:2:1.5 for the outer surface layer: the intermediate layer: the inner surface layer;

[0025] The outer surface layer of the stretch film is composed of polyethylene, anti-sticking agent, thermoplastic resin, and modified polytetrafluoroethylene, the intermediate layer of the stretch film is composed of copolymerized polypropylene and a lubricant, and the inner surface layer of the stretch film is composed of a combination of copolymerized polypropylene, a lubricant, and an anti-sticking agent.

[0026] The total thickness of the three layers of the stretched film is thirty microns.

[0027] The stretched film is stretched by either biaxial stretching or uniaxial stretching.

[0028] The stretch film is produced by a co-extrusion casting method and consists of three layers: an outer surface layer, an intermediate layer and an inner surface layer.

[0029] The present invention also provides a method for preparing a stretch film for medicine packaging, wherein the thermoplastic resin is any one of a polyolefin resin and an olefin thermoplastic elastomer or a mixture of the two.

[0030] The present invention adds a thermoplastic resin into the existing stretch film, and the thermoplastic resin is any one of a polyolefin resin and an olefin thermoplastic elastomer or a mixture of the two. Since the thermoplastic resin has excellent elasticity, a certain friction coefficient, high wear resistance, good mechanical strength, high tensile strength, and low water absorption, it can maintain stable mechanical properties in a humid environment and has good acid and alkali resistance. It can effectively improve the wear resistance, acid and alkali resistance, mechanical properties and other properties of the stretch film, thereby helping to improve the practicality of the improved stretch film and increase its service life.

[0031] Embodiment 2

[0032] Based on the above embodiments, this embodiment further provides the following contents:

[0033] The present invention also provides a method for preparing the stretch film for drug packaging, wherein the modified polytetrafluoroethylene emulsion is composed of the following raw materials in optimal weight parts, 50 parts of deionized water, 40 parts of polytetrafluoroethylene monomer, 1 part of dispersant, 0.5 parts of emulsifier, and 1 part of improver, and the preparation steps of the modified polytetrafluoroethylene emulsion are as follows:

[0034] Step 1: Add deionized water, polytetrafluoroethylene monomer, dispersant, emulsifier, etc. into a reaction container in proportion and mix and stir evenly to obtain a mixed solution 1; the stirring time in the step 1 is 20 minutes and the temperature is 50°C.

[0035] Step 2: Adding the modifier to the mixed solution 1 and continuing stirring to obtain solution 2, i.e., modified polytetrafluoroethylene emulsion. The stirring time in step 2 is 2 hours.

[0036] The present invention adds modified polytetrafluoroethylene emulsion into the existing stretched film. Since the modifier is added into the polytetrafluoroethylene emulsion, the overall structure of the existing polytetrafluoroethylene can be changed, the system crystallinity can be reduced, and the prepared modified polytetrafluoroethylene stretched film has good stretching performance. At the same time, it has a smaller pore size, which is beneficial to improving the quality of the overall stretched film.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stretch film for pharmaceutical packaging, characterized in that: The stretch film is composed of an outer surface layer, an intermediate layer and an inner surface layer, and the thickness ratio of the three layers of the stretch film is 1:2:1.5 for the outer surface layer: the intermediate layer: the inner surface layer; The outer surface layer of the stretch film is composed of polyethylene, anti-sticking agent, thermoplastic resin, and modified polytetrafluoroethylene, the intermediate layer of the stretch film is composed of copolymerized polypropylene and a lubricant, and the inner surface layer of the stretch film is composed of a combination of copolymerized polypropylene, a lubricant, and an anti-sticking agent.

2. The stretch film for medicine packaging according to claim 1, characterized in that: The total thickness of the three layers of the stretched film is thirty microns.

3. The stretch film for medicine packaging according to claim 1, characterized in that: The stretched film is stretched by either biaxial stretching or uniaxial stretching.

4. The stretch film for medicine packaging according to claim 1, characterized in that: The stretch film is produced by a co-extrusion casting method and consists of three layers: an outer surface layer, an intermediate layer and an inner surface layer.

5. The method for preparing a stretch film for pharmaceutical packaging according to any one of claims 1 to 4, characterized in that: The thermoplastic resin is any one of a polyolefin resin and an olefin thermoplastic elastomer or a mixture of the two.

6. The method for preparing a stretch film for pharmaceutical packaging according to any one of claims 1 to 4, characterized in that: The modified polytetrafluoroethylene emulsion is composed of the following raw materials in optimal weight parts, 50 parts of deionized water, 40 parts of polytetrafluoroethylene monomer, 1 part of dispersant, 0.5 parts of emulsifier, and 1 part of improver. The preparation steps of the modified polytetrafluoroethylene emulsion are as follows: Step 1: adding deionized water, polytetrafluoroethylene monomer, dispersant, emulsifier, etc. into a reaction container according to a proportion and uniformly mixing and stirring to obtain a mixed solution 1; Step 2: Adding the modifier to the mixed solution 1 and continuing stirring to obtain solution 2, i.e., modified polytetrafluoroethylene emulsion.

7. The method for preparing a stretch film for pharmaceutical packaging according to claim 6, characterized in that: The stirring time in step 1 is 20 min and the temperature is 50°C.

8. The method for preparing a stretch film for pharmaceutical packaging according to claim 6, characterized in that: The stirring time in step 2 is continued for 2 hours.