1. An environment-friendly degradable kraft paper printing ink packaging bag is characterized in that the packaging bag consists of a transparent layer, a kraft paper layer, a bonding layer, a blocking layer and a hydrophobic and oleophobic layer from outside to inside in sequence; the transparent layer is a film made of the following materials in parts by weight: 40-60 parts of polylactic acid-glycolic acid copolymer, 35-55 parts of polyvinyl butyral and 1-5 parts of titanium dioxide nano particles; the bonding layer is a polyurethane adhesive film; the barrier layer is an aluminum foil film; the hydrophobic oil-repellent layer is prepared from the following materials in parts by weight: 40-60 parts of polysiloxane resin, 30-40 parts of nano silicon dioxide, 10-15 parts of absolute ethyl alcohol, 1-5 parts of isopropanol, 5-10 parts of epoxy silane coupling agent and 10-20 parts of ultraviolet curing hot melt adhesive.

2. The package of claim 1 wherein the transparent layer has a thickness of 0.005 to 0.01 mm.

3. The package bag according to claim 1, wherein the kraft layer has a thickness of 0.5 to 0.8 mm.

4. The package of claim 1, wherein the adhesive layer has a thickness of 0.01 to 0.02 mm.

5. The package of claim 1, wherein the barrier layer has a thickness of 0.15 to 0.25 mm.

6. The package of claim 1, wherein the hydrophobic oleophobic layer has a thickness of 0.3-0.4 mm.

7. A method of making a package according to any one of claims 1 to 6, characterised by the steps of:

(1) and manufacturing a composite material: respectively placing film rolls of the transparent layer, the kraft layer, the bonding layer and the blocking layer on a hot roller press, sequentially laminating the transparent layer, the kraft layer, the bonding layer and the blocking layer from top to bottom, carrying out hot rolling lamination, rolling lamination to prepare a composite material, and then rolling; the rolling temperature is 130-135 ℃, and the pressure is 3-4 kg/cm;

(2) coating a hydrophobic oil-repellent layer; placing the film roll of the composite material on a coating machine, coating the hydrophobic and oleophobic layer material on the surface of the barrier layer, then irradiating and curing by using an ultraviolet lamp tube to prepare a packaging bag base material and rolling;

(3) and (3) bag making: putting the two rolls of base materials into a molding press, oppositely attaching the hydrophobic oil-repellent layers of the base materials, molding the overlapped base materials, hot-melting and attaching corresponding parts of the upper base material and the lower base material by the protruded parts on the hot-pressing mold to form edge sealing parts, wherein the pressure of the molding press is 6-7 kg/cm, the temperature is 160-165 ℃, and the molding time is 2 s.

8. The method for preparing a packing bag according to claim 7, wherein the transparent layer is prepared by the steps of:

(1) adding the polylactic acid-glycolic acid copolymer and the polyvinyl butyral into a stirrer, heating to 190-210 ℃, keeping the temperature, starting stirring at the stirring speed of 80-90r/min for 1-1.5h, and preparing a blending solution;

(2) heating the ultrasonic disperser to 190-;

(3) and adding the mixture into a casting film machine to prepare a transparent film roll.

9. The method for preparing the packing bag according to claim 7, wherein the hydrophobic oleophobic layer is prepared by the steps of: weighing the nano silicon dioxide in parts by weight, dissolving the nano silicon dioxide in absolute ethyl alcohol, uniformly dispersing the nano silicon dioxide in a solvent by using an ultrasonic machine, adding polysiloxane resin, an epoxy silane coupling agent and an ultraviolet curing hot melt adhesive, and stirring at normal temperature for 20 min.

Background

With the increasing attention of national policy on environmental protection, the environmental protection requirement of the printing industry is increasing year by year in recent years. According to incomplete statistics, the annual average consumption of ink iron cans in the world is 35-40 hundred million, and the annual average consumption of ink iron cans in China is about 15 hundred million, and the iron cans cause a large amount of solid waste pollution. The problem of residual ink is obviously the disadvantage of the packaging of the ink iron can, so that the flexible packaging is a necessary trend for the development of the field of ink packaging. Publication No. CN109080967A discloses an ink packaging bag, which changes the traditional ink iron can packaging mode, solves the problem of ink residue, but adopts a material such as polyethylene terephthalate in the preparation process, and the material is difficult to degrade and is not environment-friendly.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides an environment-friendly degradable kraft paper printing ink packaging bag and a preparation method thereof.

The technical scheme adopted by the invention for solving the technical problems is as follows:

an environment-friendly degradable kraft paper printing ink packaging bag is composed of a transparent layer, a kraft paper layer, a bonding layer, a blocking layer and a hydrophobic and oleophobic layer from outside to inside in sequence; the transparent layer is a film made of the following materials in parts by weight: 40-60 parts of polylactic acid-glycolic acid copolymer, 35-55 parts of polyvinyl butyral and 1-5 parts of titanium dioxide nano particles; the bonding layer is a polyurethane adhesive film; the barrier layer is an aluminum foil film; the hydrophobic oil-repellent layer is prepared from the following materials in parts by weight: 40-60 parts of polysiloxane resin, 30-40 parts of nano silicon dioxide, 10-15 parts of absolute ethyl alcohol, 1-5 parts of isopropanol, 5-10 parts of epoxy silane coupling agent and 10-20 parts of ultraviolet curing hot melt adhesive.

The thickness of the transparent layer is 0.005-0.01 mm.

The thickness of the kraft layer is 0.5-0.8 mm.

The thickness of the adhesive layer is 0.01-0.02 mm.

The thickness of the barrier layer is 0.15-0.25 mm.

The thickness of the hydrophobic oil-repellent layer is 0.3-0.4 mm.

A method of making a package as described above, comprising the steps of:

(1) and manufacturing a composite material: respectively placing the film rolls of the transparent layer, the kraft layer, the bonding layer and the blocking layer on a hot roller press, sequentially laminating the transparent layer, the kraft layer, the bonding layer and the blocking layer from top to bottom, hot rolling and laminating, rolling and laminating to prepare a composite material, and rolling, wherein the rolling temperature is 130 and 135 ℃, and the pressure is 3-4 kg/cm.

(2) Coating a hydrophobic oil-repellent layer; and (3) placing the film roll of the composite material on a coating machine, coating the hydrophobic and oleophobic layer material on the surface of the barrier layer, irradiating and curing by using an ultraviolet lamp tube to obtain the packaging bag base material, and rolling.

(3) And (3) bag making: putting the two rolls of base materials into a molding press, oppositely attaching the hydrophobic oil-repellent layers of the base materials, molding the overlapped base materials, hot-melting and attaching corresponding parts of the upper base material and the lower base material by the protruded parts on the hot-pressing mold to form edge sealing parts, wherein the pressure of the molding press is 6-7 kg/cm, the temperature is 160-165 ℃, and the molding time is 2 s.

The preparation steps of the transparent layer are as follows:

(1) adding the polylactic acid-glycolic acid copolymer and the polyvinyl butyral into a stirrer, heating to 190-210 ℃, keeping the temperature, starting stirring at the stirring speed of 80-90r/min for 1-1.5h, and preparing the blending solution.

(2) And heating the ultrasonic disperser to 190-.

(3) And adding the mixture into a casting film machine to prepare a transparent film roll.

The preparation steps of the hydrophobic oil-repellent layer are as follows: weighing the nano silicon dioxide in parts by weight, dissolving the nano silicon dioxide in absolute ethyl alcohol, uniformly dispersing the nano silicon dioxide in a solvent by using an ultrasonic machine, adding polysiloxane resin, an epoxy silane coupling agent and an ultraviolet curing hot melt adhesive, and stirring at normal temperature for 20 min.

The invention has the beneficial effects that:

1. under the synergistic effect of the multilayer structure, the invention has excellent barrier property, can effectively block oxygen, water vapor, light and the like, ensures the quality and the storage life of the ink, and reduces the ink residue.

2. The raw materials adopted in the preparation process are all environment-friendly materials, and can be biodegraded or recycled.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is an exploded view of the present invention.

Detailed Description

Referring to fig. 1, the environment-friendly degradable kraft paper ink packaging bag is composed of a transparent layer 1, a kraft paper layer 2, an adhesive layer 3, a barrier layer 4 and a hydrophobic oil-repellent layer 5 in sequence from outside to inside. Under the synergistic effect of the multilayer structure, the ink has excellent barrier property, can effectively block oxygen, water vapor, light and the like, ensures the quality and the storage life of the ink, and reduces the ink residue.

A preparation method of the packaging bag comprises the following steps:

(1) and manufacturing a composite material: and respectively placing the film rolls of the transparent layer, the kraft paper layer, the bonding layer and the barrier layer on a hot roller press, sequentially laminating the transparent layer, the kraft paper layer, the bonding layer and the barrier layer from top to bottom, carrying out hot rolling lamination, rolling lamination to prepare a composite material, and then rolling. The rolling temperature is 130-135 ℃, and the pressure is 3-4 kg/cm; the rolling temperature can be sequentially heated and rolled by a plurality of press rolls, so that the temperature of the laminated material passing through the last press roll is 130-135 ℃, or the laminated material is heated by an infrared lamp tube before rolling, so that the temperature of the laminated material is raised to 130-135 ℃ and then rolled, and the temperature of the press rolls is also heated to 130-135 ℃. When the temperature reaches 130 ℃, the transparent layer has certain adhesiveness and can be adhered to the kraft layer, wherein the pressure refers to the pressure between an upper compression roller and a lower compression roller, the adhesion between the layers is not tight enough due to too small pressure, the difference between the layers is deformed due to too large pressure, and the pressure protection is preferably 3-4 kg/cm. In this step, the rolling speed is not particularly limited, and can be adjusted as required by those skilled in the art.

(2) Coating a hydrophobic oil-repellent layer; and (3) placing the film roll of the composite material on a coating machine, coating the hydrophobic and oleophobic layer material on the surface of the barrier layer, irradiating and curing by using an ultraviolet lamp tube to obtain the packaging bag base material, and rolling. Coating and ultraviolet curing belong to the prior art, and the invention has no special requirements. Because the ultraviolet curing hot melt adhesive is added, the coating can be quickly cured by the irradiation of an ultraviolet lamp tube, the drying time of the coating is reduced, and the production period of the product is effectively shortened.

(3) And (3) bag making: putting the two rolls of base materials into a molding press, oppositely attaching the hydrophobic oil-repellent layers of the base materials, molding the overlapped base materials, hot-melting and attaching corresponding parts of the upper base material and the lower base material by the protruded parts on the hot-pressing mold to form edge sealing parts, wherein the pressure of the molding press is 6-7 kg/cm, the temperature is 160-165 ℃, and the molding time is 2 s. To only accomplish the press mold of a single cave of only bagging-off once, only need set up the cutter in the rear end of grinding apparatus can, to the press mold of many caves, need set up the cutter around every acupuncture point to accomplish the cutting in the time of the mould pressing. The packaging bag manufactured in the step is of an open structure at the upper part, and is sealed after ink is canned. In this step, mainly ultraviolet curing hot melt adhesive hot melt laminating in hydrophobic oil-repellent layer, the bond line also can produce the hot melt, and other each layer can not the hot melt, and bond line hot melt not only can not cause the influence to the product, can make the edge inseparabler and have certain hardness moreover, makes product security performance higher.

The transparent layer is a film made of the following materials in parts by weight: 40-60 parts of polylactic acid-glycolic acid copolymer (PLGA-glycerol polylactic acid-glycolic acid copolymer produced by Sienna Rexi Biotech Co., Ltd.) and polyvinyl butyral (chemical formula C)₁₆H₂₈O₅) 35-55 parts of titanium dioxide (chemical formula is TiO)₂) 1-5 parts of nano particles, wherein the thickness of the transparent layer is 0.005-0.01mm, the transparent layer is attached to one side of the kraft paper layer contacting with air, the defect of poor water resistance of the kraft paper layer is overcome, meanwhile, a compact film is formed on the surface of the kraft paper layer, air is effectively blocked, and the air tightness of the product is ensured, and the preparation steps of the transparent layer are as follows:

(1) adding the polylactic acid-glycolic acid copolymer and the polyvinyl butyral into a stirrer, heating to 190-210 ℃, keeping the temperature, starting stirring at the stirring speed of 80-90r/min for 1-1.5h, and preparing the blending solution.

(2) And heating the ultrasonic disperser to 190-.

(3) And adding the mixture into a casting film machine to prepare a transparent film roll.

In the step, the transparent layer is prepared by adopting a casting film method, compared with coating or film blowing, the production speed of the casting film is higher, and the transparency, the glossiness and the thickness uniformity of the film are better. The polyvinyl butyral has excellent transparency, good solubility, good light resistance, water resistance, heat resistance, cold resistance and film forming property, a small amount of titanium dioxide nano particles are added in the production, and the titanium dioxide nano particles endow the transparent layer with excellent ultraviolet light shielding property and transparency.

The kraft paper layer is environment-friendly degradable kraft paper, kraft paper packaging has the advantages of easiness in processing, low cost, suitability for printing, light weight, foldability, no toxicity, no odor, no pollution and the like, and the thickness of the kraft paper layer is 0.5-0.8 mm.

The adhesive layer is a polyurethane adhesive film, the polyurethane adhesive film is a hot-melt double-sided adhesive tape, the adhesive layer has excellent chemical adhesive force, elasticity and water resistance, and is environment-friendly, the thickness of the adhesive layer is 0.01-0.02 mm, and the polyurethane adhesive film is a polyurethane hot-melt adhesive film produced by Tepu environmental protection new material company Limited in Dongguan.

The barrier layer comprises the aluminium foil membrane, the aluminium foil membrane sets up the inboard at kraft paper layer for the shading to further block the entering of air, ensure the quality of printing ink in the shelf life, the thickness of barrier layer is 0.15-0.25 mm.

The hydrophobic oil-repellent layer is prepared from the following materials in parts by weight: 40-60 parts of polysiloxane resin (Shenzhen Shenpeng polysiloxane resin H201 produced by Shenzhen Shenpeng silicon fluorine material Co., Ltd.) and nano silicon dioxide (chemical formula is SiO₂) 30-40 parts of absolute ethyl alcohol (molecular formula is C)₂H₆0) 10-15 parts of isopropanol (molecular formula is C)₃H₈O) 1-5 parts, epoxy silane coupling agent (silane coupling agent produced by Shandong sea marionette organosilicon science and technology limited company) 5-10 parts and ultraviolet curing hot melt adhesive (Dongguan special curing material)A single-component high-viscosity ultraviolet curing structural adhesive hot melt adhesive 505) produced by material company Limited 10-20. The preparation method comprises the steps of weighing the nano silicon dioxide in parts by weight, dissolving the nano silicon dioxide in absolute ethyl alcohol, uniformly dispersing the nano silicon dioxide in a solvent by using an ultrasonic machine, adding polysiloxane resin, epoxy silane coupling agent and ultraviolet curing hot melt adhesive, and stirring for 20min at normal temperature. In the step, the ultraviolet curing hot-melt adhesive does not participate in the reaction, and is fully mixed in the hydrophobic and oleophobic layer coating after being prepared into the hydrophobic and oleophobic layer coating. The thickness of the hydrophobic and oleophobic layer is 0.3-0.4 mm, the hydrophobic and oleophobic layer has two advantages, firstly, the air tightness of the bag body is improved; second, can prevent that printing ink from attaching to the internal at the bag, solve the remaining problem of printing ink, avoid causing the wasting of resources, conveniently retrieve or post processing simultaneously.

The above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.