Prime-coat-free film capable of slowly releasing fragrance and preparation process

Abstract

The invention provides a prime-coat-free film capable of slowly releasing fragrance and a preparation process, the prime-coat-free film capable of slowly releasing fragrance is a multi-layer composite film with a porous structure, the prime-coat-free film capable of slowly releasing fragrance comprises a first surface layer, a core layer and a second surface layer which are arranged in sequence, and a fragrance auxiliary agent is added into the core layer and / or the second surface layer. The flavor additive comprises at least one of powder containing an essence component, particles based on the essence component, microcapsules based on the essence component, and the like. The embodiment of the invention is not only firm and durable, but also has the advantages of realizing slow release of fragrance and providing lasting fragrance, so that stable sensory feeling can be provided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of composite films, and in particular to a primer-free film with slow-release fragrance and a preparation process thereof. Background Art

[0002] Composite films can be widely used in direct packaging of dried fruits, ice cream, candy, high-end soaps, gifts, etc. Existing composite films cannot bring people olfactory enjoyment. The performance of fragrance is usually measured by its persistence and pleasantness. In addition, due to volatilization, heating, oxidation and other reasons, the sensory perception of some fragrances is also easy to change. Therefore, there is no composite film in the prior art that can achieve slow release of fragrance, lasting fragrance and stable sensory perception. Summary of the invention

[0003] The purpose of the embodiments of the present disclosure is to provide a primer-free film with slow-release fragrance and a preparation process to solve the above-mentioned problems existing in the prior art.

[0004] In order to solve the above-mentioned technical problems, an embodiment of the present disclosure provides, on the one hand, a primer-free film with a sustained release of fragrance. The primer-free film with a sustained release of fragrance has a multilayer composite film with a porous structure, which includes a first surface layer, a core layer and a second surface layer arranged in sequence, and a fragrance additive is added to the core layer and / or the second surface layer. The fragrance additive includes at least one of a powder with fragrance ingredients, particles based on fragrance ingredients, microcapsules based on fragrance ingredients, etc.

[0005] In some embodiments, the first surface layer comprises the following components in weight proportions: 97-99.9% of linear low-density polyethylene resin and 0.1-3% of anti-blocking agent.

[0006] In some embodiments, the core layer includes the following components in weight proportions: 98.5-99.8% homopolymer polypropylene resin, 0.1-1% antistatic agent, and 0-0.5% fragrance aid.

[0007] In some embodiments, the second surface layer includes the following components in weight proportions: 95-99.6% copolymerized polypropylene resin, 0.5-4% anti-blocking agent, and 0.1-1% fragrance masterbatch.

[0008] In some embodiments, the copolymerized polypropylene resin is one or more of a binary copolymerized polypropylene and a ternary copolymerized polypropylene; wherein the density of the polypropylene is 0.90-1.20 g / cm 3 The melt index is 1.5-10 g / 10 min under the test conditions of temperature 230°C and load 2.16 kg.

[0009] In some embodiments, the fragrance masterbatch comprises 10-50% of a fragrance aid, 0.05-1% of a compatibilizer, and 50-90% of a base resin.

[0010] In some embodiments, the base resin is composed of polypropylene, polyethylene or ethylene-vinyl acetate copolymer.

[0011] In some embodiments, the microcapsule is a fully enclosed flavor microcapsule or a sustained-release flavor microcapsule.

[0012] In one aspect, an embodiment of the present disclosure provides a preparation process of a primer-free film with a slow-release fragrance, wherein the primer-free film with a slow-release fragrance is any of the primer-free films described above, and the preparation process comprises the following steps:

[0013] The raw materials of each component in each layer are uniformly mixed, melt co-extruded and cooled to form a thick sheet;

[0014] The formed thick sheet is sequentially passed through a longitudinal stretching device and a transverse stretching device for a biaxial stretching process to form a film:

[0015] The stretched film is subjected to corona treatment to increase the surface tension;

[0016] The corona-treated film is wound into a mother roll for aging treatment;

[0017] The film after aging treatment is cut into products according to demand.

[0018] In some embodiments, the process of uniformly mixing the raw materials of each component in each layer, melt co-extruding and cooling to form a thick sheet comprises: extruding the second surface layer through a first auxiliary extruder, with an outlet temperature of 245-250° C.; extruding the core layer through a main extruder, with an outlet temperature of 245-250° C.; extruding the first surface layer through a second auxiliary extruder, with an outlet temperature of 245-250° C. and a die head temperature of 245-250° C., wherein the temperature of the cooling casting device for cooling is controlled at 75-80° C.;

[0019] The process of biaxially stretching the formed thick sheet through a longitudinal stretching device and a transverse stretching device in sequence to generate a film includes: the operating temperature of the rollers in the longitudinal stretching device is controlled as follows: the preheating zone is 85-90°C, the stretching zone is 110-115°C, the shaping zone is 90-95°C, and the stretching ratio is 4.5-5.5; the operating temperature of the rollers in the transverse stretching device is controlled as follows: the preheating zone is 150-155°C, the stretching zone is 125-130°C, the shaping zone is 95-100°C, and the stretching ratio is 6-8.

[0020] The disclosed embodiment is not only strong and durable, but also has the advantages of achieving slow release of fragrance and providing long-lasting fragrance, thereby being able to provide a stable sensory experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 Schematic diagram of the structure of the primer-free film with sustained release of fragrance in the embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] Various aspects and features of the present disclosure are described herein with reference to the drawings.

[0024] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0026] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0027] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0028] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0029] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to substantially any combination.

[0030] The first embodiment of the present disclosure provides a primer-free film with slow-release fragrance. The primer-free film with slow-release fragrance is mainly used in the packaging field and is prepared by using different types of polyolefin resins.

[0031] Specifically, the slow-release fragrance-free primer-free film is a multilayer composite film structure prepared by three-layer co-extrusion and biaxial stretching technology, such as Figure 1 As shown, it comprises a first surface layer 1, a core layer 2 and a second surface layer 3 arranged in sequence, each of which is composed of a plurality of polymers and a plurality of additives. Furthermore, a functional fragrance additive and / or fragrance masterbatch is added to the core layer 2 and / or the second surface layer 3, so that a sustained-release, volatile and environmentally friendly primer-free fragrance film can be prepared.

[0032] Specifically, the first surface layer 1 comprises the following components in weight proportions: 97-99.9% linear low-density polyethylene resin and 0.1-3% anti-blocking agent; the core layer 2 comprises the following components in weight proportions: 98.5-99.8% homopolymer polypropylene resin, 0.1-1% antistatic agent and 0-0.5% fragrance aid.

[0033] Furthermore, the second surface layer 3 comprises the following components in the following weight proportions: 95-99.6% copolymerized polypropylene resin, 0.5-4% anti-blocking agent and 0.1-1% fragrance masterbatch.

[0034] Preferably, the copolymerized polypropylene resin is one or more of binary copolymerized polypropylene and ternary copolymerized polypropylene; wherein the density of the polypropylene is 0.90-1.20 g / cm 3 The melt index is 1.5-10 g / 10 min under the test conditions of temperature 230°C and load 2.16 kg.

[0035] Furthermore, the fragrance masterbatch comprises 10-50% of a fragrance aid, 0.05-1% of a compatibilizer and 50-90% of a base resin.

[0036] The fragrance aid in the above embodiment includes at least one of powder with fragrance ingredients, particles based on fragrance ingredients, microcapsules based on fragrance ingredients, etc. The particles or microcapsules here are used to achieve a sustained release effect; the fragrance ingredients here are lemon, mint, ocean breeze, rose, lavender, vanilla and other types of fragrances; the base resin here is composed of polypropylene, polyethylene or ethylene-vinyl acetate copolymer.

[0037] Specifically, the microcapsules described here are a preferred way to slowly release fragrance. Microencapsulation of flavor ingredients refers to forming a protective film around the substance or ingredient particles that need to be wrapped. By encapsulating the active ingredients, the stability of the final product can be improved, and the evaporation and degradation of volatile active substances can be reduced, thereby avoiding unpleasant tastes during use.

[0038] Based on the different release modes of the flavor components in the microcapsules, the microcapsules are divided into two types, namely fully enclosed flavor microcapsules and sustained-release flavor microcapsules. Since the flavor release mechanisms of the two types of flavor microcapsules are different, the applicability of the two types of microcapsules in different application fields is also different.

[0039] In this embodiment, the microcapsules are preferably slow-release flavor microcapsules, which means that the flavor components are slowly released into the environment through the pores on the capsule wall of the microcapsule, and the intensity and persistence of the fragrance release mainly depend on the size of the pores on the capsule wall of the microcapsule and the volatility of the flavor components themselves; in addition, the ambient temperature will also affect the degree of fragrance release of the slow-release flavor microcapsules, wherein the higher the ambient temperature, the faster the fragrance release, which means the shorter the persistence. Therefore, the fragrance released by this microcapsule usually does not stay in the air for a long time, especially under high temperature conditions.

[0040] The sustained-release fragrance-free primer-free film of the present embodiment is a multi-layer composite film, in the preparation process of which a variety of polymer materials are manufactured by interlayer bonding and crystallized by cooling. Since different polymer components have different degrees of crystallinity and crystallization behaviors, the multi-layer composite film here exhibits various crystalline forms, such as single crystals, spherulites, dendrites, transverse crystals, etc., and ultimately a porous crystalline form is formed in the structure of the formed multi-layer composite film.

[0041] Furthermore, low temperature has a certain influence on the crystallization behavior of the film. Due to the large temperature difference, the crystallization behavior of high molecular polymers such as polypropylene and polyethylene is promoted and accelerated, thus forming a microporous structure in which multiple crystals coexist under low temperature conditions, especially a porous diffusion structure.

[0042] Here, since the crystallization behavior of the polymer in the first surface layer 1, the second surface layer 3 and the core layer 2 is irregular, especially in the form of spherulites or single crystals, there are small porous structures between the crystals, and the porous state finally appears as an interlaced honeycomb in the three-layer film, and the aroma molecules released by the particles or microcapsules are released to the outside through the porous honeycomb structure to achieve the effect of slow release and long-lasting fragrance. In this way, the multi-layer composite film forms a porous structure through cooling crystallization of multiple polymers, and the released aroma molecules are released to the outside through the porous structure in the film based on the three-layer structure.

[0043] The disclosed embodiment is not only strong and durable, but also has the advantages of achieving slow release of fragrance and providing long-lasting fragrance, thereby being able to provide a stable sensory experience.

[0044] The second embodiment of the present disclosure provides a preparation process of a primer-free film with a slow-release fragrance, which includes the primer-free film with a slow-release fragrance of any one of the first embodiments above. The preparation process of the primer-free film with a slow-release fragrance includes the following steps:

[0045] S101, uniformly mixing the raw materials of the components in the above-mentioned layers, melt co-extruding and cooling to form a thick sheet; specifically, extruding the second surface layer 3 through the first auxiliary extruder, and its outlet temperature is 245-250° C.; extruding the core layer 2 through the main extruder, and its outlet temperature is 245-250° C.; extruding the first surface layer 1 through the second auxiliary extruder, and its outlet temperature is 245-250° C. and the die head temperature is 245-250° C.; in addition, the temperature of the cooling casting device for cooling is controlled at 75-80° C.;

[0046] S102, the thick sheet formed in step S101 is sequentially subjected to a biaxial stretching process by a machine direction orientation (MDO) and a transverse direction orientation (TDO) to generate the film body:

[0047] The operating temperature of the rollers in the longitudinal stretching device is controlled as follows: the preheating zone is 85-90°C, the stretching zone is 110-115°C, the shaping zone is 90-95°C, and the stretching ratio is 4.5-5.5; the operating temperature of the rollers in the transverse stretching device is controlled as follows: the preheating zone is 150-155°C, the stretching zone is 125-130°C, the shaping zone is 95-100°C, and the stretching ratio is 6-8;

[0048] Step S103, performing corona treatment on the film stretched in step S102 to increase the surface tension;

[0049] Step S104, winding the film body processed in step S103 into a mother roll for aging treatment;

[0050] Step S105, the film processed in step S104 is cut into products according to demand.

[0051] The disclosed embodiment is not only strong and durable, but also has the advantages of achieving slow release of fragrance and providing long-lasting fragrance, thereby being able to provide a stable sensory experience.

[0052] In addition, the features of the embodiments shown in the drawings of the present application or the various embodiments mentioned in this specification are not necessarily understood as independent embodiments. Instead, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the drawings.

[0053] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person 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. Such 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 application, and should all be included in the protection scope of the present application.

Claims

1. A primer-free film with slow-release fragrance, characterized in that: The sustained-release fragrance-free primer-free film has a multilayer composite film with a porous structure, which includes a first surface layer, a core layer and a second surface layer arranged in sequence. A fragrance additive is added to the core layer and / or the second surface layer, and the fragrance additive includes at least one of a powder with fragrance ingredients, particles based on fragrance ingredients, microcapsules based on fragrance ingredients, etc.

2. The primer-free film with sustained-release fragrance according to claim 1, characterized in that: The first surface layer comprises the following components in weight proportion: 97-99.9% of linear low-density polyethylene resin and 0.1-3% of anti-blocking agent.

3. The primer-free film with sustained-release fragrance according to claim 1, characterized in that: The core layer comprises the following components in proportion by weight: 98.5-99.8% homopolymer polypropylene resin, 0.1-1% antistatic agent and 0-0.5% fragrance aid.

4. The primer-free film with sustained-release fragrance according to claim 1, characterized in that: The second surface layer comprises the following components in proportion by weight: 95-99.6% copolymerized polypropylene resin, 0.5-4% anti-blocking agent and 0.1-1% fragrance masterbatch.

5. The primer-free film with sustained-release fragrance according to claim 4, characterized in that: The copolymerized polypropylene resin is one or more of binary copolymerized polypropylene and ternary copolymerized polypropylene; wherein the density of the polypropylene is 0.90-1.20 g / cm 3 The melt index is 1.5-10 g / 10 min under the test conditions of temperature 230°C and load 2.16 kg.

6. The primer-free film with sustained-release fragrance according to claim 4, characterized in that: The fragrance masterbatch comprises 10-50% of fragrance auxiliary agent, 0.05-1% of compatibilizer and 50-90% of base resin.

7. The primer-free film with sustained-release fragrance according to claim 6, characterized in that: The matrix resin consists of polypropylene, polyethylene or ethylene-vinyl acetate copolymer.

8. The primer-free film for sustained-release fragrance according to any one of claims 1 to 7, characterized in that: The microcapsule is a fully enclosed flavor microcapsule or a sustained-release flavor microcapsule.

9. A process for preparing a primer-free film with sustained release of fragrance, characterized in that: The slow-release fragrance-free primer-free film is the slow-release fragrance-free primer-free film according to any one of claims 1 to 8, and the preparation process comprises the following steps: The raw materials of each component in each layer are uniformly mixed, melt co-extruded and cooled to form a thick sheet; The formed thick sheet is sequentially passed through a longitudinal stretching device and a transverse stretching device for a biaxial stretching process to form a film: The stretched film is subjected to corona treatment to increase the surface tension; The corona-treated film is wound into a mother roll for aging treatment; The film after aging treatment is cut into products according to demand.

10. The process for preparing the primer-free film with sustained-release fragrance according to claim 9, characterized in that: The process of uniformly mixing the raw materials of each component in each layer, performing melt co-extrusion and cooling to form a thick sheet comprises: extruding the second surface layer through a first auxiliary extruder, with an outlet temperature of 245-250° C.; extruding the core layer through a main extruder, with an outlet temperature of 245-250° C.; extruding the first surface layer through a second auxiliary extruder, with an outlet temperature of 245-250° C. and a die head temperature of 245-250° C., wherein the temperature of the cooling casting device for cooling is controlled at 75-80° C.; The process of biaxially stretching the formed thick sheet through a longitudinal stretching device and a transverse stretching device in sequence to generate a film includes: the operating temperature of the rollers in the longitudinal stretching device is controlled as follows: the preheating zone is 85-90°C, the stretching zone is 110-115°C, the shaping zone is 90-95°C, and the stretching ratio is 4.5-5.5; the operating temperature of the rollers in the transverse stretching device is controlled as follows: the preheating zone is 150-155°C, the stretching zone is 125-130°C, the shaping zone is 95-100°C, and the stretching ratio is 6-8.

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