阅读说明：本技术 一种正离子气体释放型双效复合保鲜贴膜 (Positive ion gas release type double-effect composite fresh-keeping film ) 是由 李磊 于 2018-07-09 设计创作，主要内容包括：本发明提出了一种正离子气体释放型双效复合保鲜贴膜,用以解决现有技术中不具有广谱性,并且不具有可控性,周期短的问题,包括贴膜主体和不干胶层,不干胶层在贴膜主体上设置；其中贴膜主体为层结构,从下至上依次包括防雾层、复合保鲜涂层、高分子吸水层、缓释层、隔离层；所述复合保鲜涂层包括粘结剂、杀菌前物质和激活剂；缓释层由焦亚硫酸盐和/或重亚硫酸盐、保水剂、阻水剂、包埋剂和粘合剂组成；不干胶层包括不干胶涂层,其中不干胶涂层设置在隔离层之上。复合保鲜涂层与高分子吸水层反应能够释放出杀菌气体,并且由于高分子吸水层能够根据环境湿度控制吸收或释放水分,从而实现可调杀菌气体量的目的。(The invention provides a positive ion gas release type double-effect composite fresh-keeping film, which is used for solving the problems of no broad spectrum, no controllability and short period in the prior art and comprises a film main body and a non-setting adhesive layer, wherein the non-setting adhesive layer is arranged on the film main body; wherein the main body of the film is of a layer structure and sequentially comprises an antifogging layer, a composite fresh-keeping coating, a polymer water-absorbing layer, a slow-release layer and an isolating layer from bottom to top; the composite fresh-keeping coating comprises a binder, a pre-sterilization substance and an activator; the slow release layer consists of pyrosulfite and/or bisulfite, a water retention agent, a water blocking agent, an embedding agent and an adhesive; the non-drying adhesive layer comprises a non-drying adhesive coating, wherein the non-drying adhesive coating is arranged on the isolation layer. The composite fresh-keeping coating layer reacts with the polymer water absorption layer to release the sterilizing gas, and the polymer water absorption layer can control and absorb or release the water according to the environment humidity, so that the aim of adjusting the sterilizing gas amount is fulfilled.)

1. A positive ion gas release type double-effect composite preservative film is characterized by comprising a film main body and a non-setting adhesive layer, wherein the non-setting adhesive layer is arranged on the film main body; wherein the main body of the film is of a layer structure and sequentially comprises an antifogging layer, a composite fresh-keeping coating, a polymer water-absorbing layer, a slow-release layer and an isolating layer from bottom to top;

the composite fresh-keeping coating comprises a binder, a pre-sterilization substance and an activator, wherein the mass ratio of the pre-sterilization substance to the binder is 2-5: 10, and the mass ratio of the activator to the pre-sterilization substance is 1-2: 10; the pre-sterilization substance is C₄H₆And a water-soluble polyguanidine inorganic acid salt or organic acid salt;

the slow release layer consists of pyrosulfite and/or bisulfite, a water retention agent, a water blocking agent, an embedding agent and an adhesive;

the non-drying adhesive layer comprises a non-drying adhesive coating, wherein the non-drying adhesive coating is arranged on the isolation layer.

2. The positive ion gas release type double-effect composite fresh-keeping sticking film as claimed in claim 1, wherein the isolation layer is one of a polyester film, a polypropylene film, a polyethylene film and silicon rubber, and the thickness of the isolation layer is 0.09-0.1 mm.

3. The positive ion gas release type double-effect composite preservative film according to claim 1, wherein the slow release layer is composed of 20-60% by weight of pyrosulfite and/or bisulfite, 1-20% by weight of water retention agent, 5-30% by weight of water blocking agent, 10-30% by weight of embedding agent and 1-10% by weight of adhesive.

4. The positive ion gas release type double-effect composite preservative film as claimed in claim 1, wherein the water-retaining agent is selected from one or more of polyethylene glycol, modified corn starch, quicklime, calcium chloride, magnesium chloride, glycerol and polyacrylate; the water-blocking agent is paraffin and/or PE; the embedding agent is one or more of cyclodextrin, ethyl cellulose and carboxymethylated corn modified starch; the adhesive is one or more of gum arabic and polyvinyl acetate.

5. The positive ion gas release type double-effect composite fresh-keeping sticking film as claimed in claim 1, wherein the high-molecular water-absorbing layer is high-molecular water-absorbing resin.

6. The positive ion gas release type double-effect composite fresh-keeping sticking film as claimed in claim 1, wherein the adhesive is an ethylene-vinyl acetate copolymer, a natural rubber or a polyurethane adhesive; the activator is an organic acid.

7. The positive ion gas release type double-effect composite fresh-keeping sticking film as claimed in claim 1, wherein the water-soluble polyguanidine inorganic acid salt or organic acid salt includes but is not limited to one or more of the following substances: polyhexamethylene (bis) guanidine hydrochloride, polyhexamethylene (bis) guanidine propionate, polyhexamethylene (bis) guanidine nitrate, polyhexamethylene (bis) guanidine carbonate, other water-soluble inorganic or organic acid salts of polyhexamethylene (bis) guanidine.

8. The positive ion gas release type double-effect composite fresh-keeping sticking film as defined in claim 1, wherein the antifogging layer is a film-coated paper, and the film is arranged to face outwards.

9. The positive ion gas release type double-effect composite preservative film as claimed in claim 1, wherein the self-adhesive coating is a solvent-free acrylic pressure-sensitive adhesive, and a self-adhesive film is further adhered on the self-adhesive coating.

10. The method for preparing fresh-keeping adhesive film according to any one of claims 1 to 9, comprising the steps of:

(1) coating a non-setting adhesive coating, wherein the non-setting adhesive coating is a solvent-free acrylic pressure-sensitive adhesive, and the non-setting adhesive coating is taken as 10 parts by mass;

(2) an isolating layer, a slow release layer, a polymer water absorption layer, a composite fresh-keeping coating and an anti-fog layer are sequentially coated on the non-setting adhesive coating; pyrosulfite and/or bisulfite, a water retention agent, a water blocking agent, an embedding agent and an adhesive are respectively weighed according to the proportion of 20-60%, 1-20%, 5-30%, 10-30% and 1-10% of the total weight of the slow release layer, then the pyrosulfite and/or bisulfite and the embedding agent are mixed and stirred at high speed for 3-5 min, the water retention agent is added, then the mixture is dissolved in the adhesive and the water blocking agent in a glycerol bath and stirred for 10-20 min to prepare pasty slurry, and then the slurry is coated on one side of a polymer water absorption layer to form the slow release layer; coating a polymer water absorption layer on the outer side surface of the slow release layer, and taking 10 parts by mass; coating a composite fresh-keeping coating on the outer side surface of the polymer water absorption layer, and taking 10 parts of a binder, 2-5 parts of a pre-sterilization substance and 0.2-1 part of an activator according to parts by mass; coating the outer side surface of the composite fresh-keeping coating with a film coating paper serving as an anti-fog layer in a mode that the film coating faces outwards;

(3) and finally pressing the product after the combination at the temperature of 100-140 ℃ for 3-20 minutes to prepare the positive ion gas release type double-effect composite preservative film.

Technical Field

The invention relates to the technical field of fruit and vegetable preservation, in particular to a positive ion gas release type double-effect preservative film.

Background

In recent years, the yield of vegetables and fruits in China is increased rapidly, the yield of fruits is the first in the world, and generally, the vegetables and fruits need to be processed for 2-5 days from the field to the hands of consumers. Due to the lagging preservation technology, a great amount of vegetables and fruits are rotten in the period, and huge economic loss is caused.

The main cause of vegetable and fruit rot is microorganisms, the respiration intensity is gradually increased along with the increase of the maturity, and after reaching a certain peak, the respiration intensity is reduced, and the peak period is obvious. The fruits and vegetables enter the aging stage when the respiratory peak comes, which is the turning point of fruit and vegetable maturity and aging, and the physiological and biochemical changes of the fruits and vegetables are rapid, so that the quality and flavor of the fruits and vegetables are obviously changed. After the fruits and vegetables have a respiratory peak, the quality of the fruits and vegetables is obviously aged, and the phenomena of chlorosis, yellowing, aging and upwarping of the base parts of the leaves and the stems appear. In addition, the high-moisture fruits and vegetables such as fresh young garlic shoots contain more than 90% of moisture and carry infected microorganisms in the fields, harvesting and transportation processes, so that the fruits and vegetables are easy to get ill in the middle and later storage periods, and a large amount of rot is caused to cause irreparable loss. In order to prevent decay caused by microorganisms, pesticides are mostly adopted for soaking in production, which not only takes labor and time, but also more importantly causes multiple food safety incidents. Therefore, the invention is needed to provide a fresh-keeping patch which can inhibit the breath consumption, reduce the loss, improve the storage quality and ensure the quality safety.

The existing preservation technology is single gas sterilization, does not have broad spectrum, and does not have the defects of controllability, short period and the like.

Disclosure of Invention

The invention provides a positive ion gas release type double-effect fresh-keeping film, which solves the problems of no broad spectrum, no controllability and short period in the prior art.

The technical scheme of the invention is realized as follows:

a positive ion gas release type double-effect composite preservative film comprises a film main body and a non-setting adhesive layer, wherein the non-setting adhesive layer is arranged on the film main body; wherein the main body of the film is of a layer structure and sequentially comprises an antifogging layer, a composite fresh-keeping coating, a polymer water-absorbing layer, a slow-release layer and an isolating layer from bottom to top;

the composite fresh-keeping coating comprisesThe adhesive comprises a binder, a pre-sterilization substance and an activator, wherein the mass ratio of the pre-sterilization substance to the binder is 2-5: 10, and the mass ratio of the activator to the pre-sterilization substance is 1-2: 10; the pre-sterilization substance is C₄H₆And a water-soluble polyguanidine inorganic acid salt or organic acid salt;

the slow release layer consists of pyrosulfite and/or bisulfite, a water retention agent, a water blocking agent, an embedding agent and an adhesive;

the non-drying adhesive layer comprises a non-drying adhesive coating, wherein the non-drying adhesive coating is arranged on the isolation layer.

Preferably, the isolation layer is one of a polyester film, a polypropylene film, a polyethylene film and silicon rubber, and the thickness of the isolation layer is 0.09-0.1 mm.

Preferably, the slow release layer consists of 20 to 60 weight percent of pyrosulfite and/or bisulfite, 1 to 20 weight percent of water retention agent, 5 to 30 weight percent of water-blocking agent, 10 to 30 weight percent of embedding agent and 1 to 10 weight percent of adhesive.

Preferably, the water retention agent is selected from one or more of polyethylene glycol, modified corn starch, quicklime, calcium chloride, magnesium chloride, glycerol and polyacrylate; the water-blocking agent is paraffin and/or PE; the embedding agent is one or more of cyclodextrin, ethyl cellulose and carboxymethylated corn modified starch; the adhesive is one or more of gum arabic and polyvinyl acetate.

Preferably, the polymer water-absorbing layer is polymer water-absorbing resin.

Preferably, the binder is an ethylene-vinyl acetate copolymer, a natural rubber or a polyurethane binder; the activator is an organic acid.

Preferably, the water-soluble inorganic acid salt or organic acid salt of polyguanidine includes but is not limited to one or more of the following substances: polyhexamethylene (bis) guanidine hydrochloride, polyhexamethylene (bis) guanidine propionate, polyhexamethylene (bis) guanidine nitrate, polyhexamethylene (bis) guanidine carbonate, other water-soluble inorganic or organic acid salts of polyhexamethylene (bis) guanidine.

Preferably, the antifogging layer is a piece of laminating paper, and the laminating film is arranged outwards.

Preferably, the length of the film main body is longer than that of the adhesive layer, and two ends of the film main body extend out of the adhesive layer.

Preferably, the non-setting adhesive coating is solvent-free acrylic pressure-sensitive adhesive, and a non-setting adhesive film is further pasted outside the non-setting adhesive coating.

The invention also provides a preparation method of the positive ion gas release type double-effect composite preservative film, which comprises the following steps:

(1) coating a non-setting adhesive coating, wherein the non-setting adhesive coating is a solvent-free acrylic pressure-sensitive adhesive, and the non-setting adhesive coating is taken as 10 parts by mass;

(2) an isolating layer, a slow release layer, a polymer water absorption layer, a composite fresh-keeping coating and an anti-fog layer are sequentially coated on the non-setting adhesive coating; pyrosulfite and/or bisulfite, a water retention agent, a water blocking agent, an embedding agent and an adhesive are respectively weighed according to the proportion of 20-60%, 1-20%, 5-30%, 10-30% and 1-10% of the total weight of the slow release layer, then the pyrosulfite and/or bisulfite and the embedding agent are mixed and stirred at high speed for 3-5 min, the water retention agent is added, then the mixture is dissolved in the adhesive and the water blocking agent in a glycerol bath and stirred for 10-20 min to prepare pasty slurry, and then the slurry is coated on one side of a polymer water absorption layer to form the slow release layer; coating a polymer water absorption layer on the outer side surface of the slow release layer, and taking 10 parts by mass; coating a composite fresh-keeping coating on the outer side surface of the polymer water absorption layer, and taking 10 parts of a binder, 2-5 parts of a pre-sterilization substance and 0.2-1 part of an activator according to parts by mass; coating the outer side surface of the composite fresh-keeping coating with a film coating paper serving as an anti-fog layer in a mode that the film coating faces outwards;

(3) and finally pressing the product after the combination at the temperature of 100-140 ℃ for 3-20 minutes to prepare the positive ion gas release type double-effect composite preservative film.

The invention has the beneficial effects that:

1. the composite fresh-keeping coating layer reacts with the polymer water absorption layer to release the sterilizing gas, and the polymer water absorption layer can control and absorb or release water according to the environmental humidity, so that the aim of adjusting the amount of the sterilizing gas is fulfilled; the isolation layer separates self-adhesive layer and pad pasting main part, has water-proof effects, and the self-adhesive layer can be fixed the preservative film in the suitable position on eating the material.

2. The two ends of the film main body extend out of the adhesive layer, the area of the film main body is increased as much as possible in the fixed range of the adhesive layer, and more sterilizing gas can be released.

3. The slow-acting pesticide application layer starts to release the active ingredients of the pesticide at a constant speed under the protection of the isolation layer, and the duration is long, so that the invasion of pathogenic bacteria to fruits and vegetables is inhibited. Meanwhile, the antifogging layer can adsorb a large amount of water so as to improve the humid environment in the package and provide favorable conditions for inhibiting the growth of pathogenic bacteria.

4. The pre-sterilization substance and the activator can accelerate the reaction under the action of the polymer water absorption layer and can quickly release sterilization gas; meanwhile, the macromolecular water-absorbent resin can keep the balance of the microenvironment humidity of the food material, absorb moisture when the humidity of the food material is high, and release moisture when the humidity of the food material is low; the water release process drives the release of the sterilizing gas.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a positive ion gas release type double-effect composite fresh-keeping film of the present invention;

1. an anti-fog layer, 2 a composite fresh-keeping coating, 3 a polymer water absorption layer, 4 a slow release layer, 5 an isolation layer, 6 a non-setting adhesive coating and 7 a non-setting adhesive film.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.