CN109368000B - Environment-friendly light-resistant double-layer waterproof packaging bag and preparation method thereof - Google Patents

Environment-friendly light-resistant double-layer waterproof packaging bag and preparation method thereof Download PDF

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CN109368000B
CN109368000B CN201811170732.XA CN201811170732A CN109368000B CN 109368000 B CN109368000 B CN 109368000B CN 201811170732 A CN201811170732 A CN 201811170732A CN 109368000 B CN109368000 B CN 109368000B
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layer
parts
plastic
raw materials
kraft paper
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CN109368000A (en
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陆伟錩
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Guangzhou Xinwen Plastic Co ltd
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Guangzhou Xinwen Plastic Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/41—Opaque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/552—Fatigue strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Abstract

The invention relates to the technical field of food packaging, in particular to an environment-friendly light-proof double-layer waterproof packaging bag and a preparation method thereof. The packaging bag comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer. The novel light-resistant multilayer waterproof packaging bag prepared by the invention is produced by adopting pure plastic raw materials, has excellent light-resistant performance, strength performance, weather resistance, cleanliness and waterproofness, and is more environment-friendly and extremely easy to recycle because paper is removed.

Description

Environment-friendly light-resistant double-layer waterproof packaging bag and preparation method thereof
Technical Field
The invention belongs to the technical field of food packaging, and particularly relates to an environment-friendly light-proof double-layer waterproof packaging bag and a preparation method thereof.
Background
Since China adds WTO, the living standard of people is greatly improved, and various national civilian industries such as domestic manufacturing industry, food industry, pharmaceutical industry and the like are rapidly developed, and a huge packaging market is behind the industries. Over the past decade, the packaging bag materials have been updated, and have gradually been developed from traditional materials such as rattan, wood, cotton, thread, paper, metal, etc. to advanced materials for artificial compounding. For example, plastic is widely used for manufacturing material packaging bags due to its characteristics of low cost, quality control, portability, easy processing, diversified formation and the like.
The conventional paper-plastic composite packaging bag is deeply loved by modified plastic manufacturers because a layer of kraft paper with extremely poor light transmittance provides better light shielding performance, and a composite layer of film and plastic woven base cloth provides strength performance, so that the proportion of the paper-plastic composite bag adopted in the modified plastic industry is up to more than 95% at present, but with the enhancement of environmental awareness in recent years, the non-environmental-friendly property of the paper-plastic composite bag gradually appears, the price of the domestic kraft paper is multiplied, the paper-plastic composite bag is difficult to separate and recycle after being compounded with plastic, the environment is polluted, and the surface of the paper-plastic composite bag is easy to damage after being wetted, so that the development of a novel light-shielding multilayer waterproof packaging bag becomes a hotspot researched at present.
Disclosure of Invention
In order to solve the above problems, the present invention provides in a first aspect an environment-friendly light-resistant double-layer waterproof packaging bag, comprising a surface layer, a middle layer, and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
As a preferred technical scheme, the kraft paper imitation plastic layer is 20-30g/m in weight of square gram2The plastic woven cloth layer is 70-90g/m2The pure plastic film is 20-30g/m2。
As a preferable technical scheme, the preparation raw materials of the kraft paper imitation plastic layer comprise the following components in parts by weight: 10-50 parts of polyethylene resin, 50-100 parts of polypropylene resin, 0.01-5 parts of polyethylene wax, 0.01-0.3 part of antioxidant, 1-10 parts of titanium dioxide, 0.1-1 part of lemon yellow and 0.05-1 part of lithol red bk.
As a preferable technical scheme, the preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 10-50 parts of polyethylene resin, 50-98 parts of polypropylene resin, 0.01-5 parts of polyethylene wax, 1-5 parts of carbon black, 0.01-0.5 part of ultraviolet absorbent and 0.01-0.5 part of antioxidant.
As a preferable technical scheme, the raw materials for preparing the pure plastic film layer comprise the following components in parts by weight: 20-50 parts of polyethylene resin and 50-90 parts of polypropylene resin.
As a preferable technical scheme, the weight ratio of the polyethylene resin to the polypropylene resin of the kraft paper imitation plastic layer is 1 (2-5).
As a preferred technical scheme, the weight ratio of the titanium dioxide, the lemon yellow and the lithol rubine is 1 (0.05-0.1) to 0.01-0.05.
In a preferred embodiment, the kraft paper-like plastic layer polypropylene resin is a random polypropylene resin.
As a preferred technical scheme, the average particle size of the titanium dioxide is 0.22-0.26 um.
The invention provides a preparation method of an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises the following steps:
(1) drawing: stirring the raw materials for preparing the plastic woven cloth layer according to a certain proportion, heating and extruding the raw materials into a film, cutting the film into strips after cooling the film by a water tank, stretching the film into filaments by 5 to 6 times by a heating oven, forming and cooling the filaments, and rolling the filaments into filament ingots to finish the production of the filament spindles;
(2) weaving: loading the coiled silk spindle on a knitting machine, arranging according to different specifications, weaving into a barrel material in a warp-weft direction in a crossed manner, cutting into pieces by a hot knife, and rolling into a base material cloth roll;
(3) compound bag making: the method comprises the following steps of (1) winding a base material cloth on a compound machine, preheating the base material cloth, enabling the base material cloth to enter a surface layer compound device, stirring raw materials of a kraft paper imitation plastic layer according to a certain proportion, heating the raw materials, extruding and coating the raw materials on a base material, pressing and cooling the raw materials by a specific kraft paper line embossing roller to form a specific surface layer, carrying out corona treatment on the polarity of the surface of the kraft paper, enabling the raw materials of a pure plastic film layer to enter an inner layer compound device, stirring the raw materials of the pure plastic film layer according to a certain proportion;
(4) sewing and heat sealing: and (3) feeding the cylindrical bag into a sewing machine to sew the bottom edge, and then installing the bottom edge in a heat sealing mode to be heat sealed, so as to obtain the environment-friendly light-proof double-layer waterproof packaging bag.
Has the advantages that: the novel light-resistant multilayer waterproof packaging bag prepared by the invention is produced by adopting pure plastic raw materials, the surface layer adopts color-mixing plastic, the color of the surface layer is similar to that of original kraft paper, the surface roughness of the surface layer is similar to that of the kraft paper through a special surface treatment process, the stacking stability after packaging is ensured, the middle layer adopts pure black woven cloth and UV (ultraviolet) to provide high light-resistant performance, strength performance and weather resistance, the inner layer adopts a pure plastic film to ensure the cleanliness and waterproofness of the product, and the packaging bag is more environment-friendly and extremely easy to recycle because paper is removed.
Detailed Description
The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments, and the scope of protection is not limited thereto.
The words "preferred", "more preferred", and the like, in the present invention refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
In order to solve the above problems, the present invention provides in a first aspect an environment-friendly light-resistant double-layer waterproof packaging bag, comprising a surface layer, a middle layer, and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
In a preferred embodiment, the kraft paper imitation plastic layer is 20-30g/m in weight of square gram2The plastic woven cloth layer is 70-90g/m2The pure plastic film is 20-30g/m2。
The square gram weight of the invention is obtained by sampling with a standard 100 square centimeter disc quantitative sampler and then measuring with an electronic balance with the precision of 0.01 g.
In a preferred embodiment, the kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 10-50 parts of polyethylene resin, 50-100 parts of polypropylene resin, 0.01-5 parts of polyethylene wax, 0.01-0.3 part of antioxidant, 1-10 parts of titanium dioxide, 0.1-1 part of lemon yellow and 0.05-1 part of lithol red bk.
In a preferred embodiment, the plastic woven fabric layer is prepared from the following raw materials in parts by weight: 10-50 parts of polyethylene resin, 50-98 parts of polypropylene resin, 0.01-5 parts of polyethylene wax, 1-5 parts of carbon black, 0.01-0.5 part of ultraviolet absorbent and 0.01-0.5 part of antioxidant.
In a preferred embodiment, the raw materials for preparing the pure plastic film layer comprise the following components in parts by weight: 20-50 parts of polyethylene resin and 50-90 parts of polypropylene resin.
Polyethylene resin
The polyethylene resin is a thermoplastic resin prepared by polymerizing ethylene, is a linear saturated hydrocarbon, has high inertia and has no toxicity to the environment. It mainly comprises Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE) and High Density Polyethylene (HDPE). The linear low-density polyethylene is the variety with the largest output in polyethylene, has various excellent performances of the low-density polyethylene and the high-density polyethylene, and is widely applied in the field of films.
The polyethylene resin of the invention has the trademark of LDPE 951-000 and is purchased from Mognoni petrochemical company.
Polypropylene resin
The polypropylene resin is a crystalline polymer with a regular structure, is light milky granular, tasteless, nontoxic and light thermoplastic resin. The processing can be carried out by injection molding, extrusion molding, blow molding, spinning and the like. The composite material is suitable for manufacturing various electrical appliance parts, television and radio shells, anticorrosion pipelines, plates, automobile parts, turnover boxes, woven packaging bags, packaging film binding materials, various containers, various clothing articles, artificial lawns and the like.
In a preferred embodiment, the polypropylene resin of the kraft paper-like plastic layer of the invention is a random polypropylene resin.
The terms "isotactic polypropylene" and "atactic polypropylene" in the present invention mean that polypropylene resins are classified into isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene according to the difference in the methyl arrangement position. The methyl groups arranged on the same side of the main molecular chain are called isotactic polypropylene, if the methyl groups are arranged on both sides of the main molecular chain disorderly, the isotactic polypropylene is called, and when the methyl groups are arranged on both sides of the main molecular chain alternately, the syndiotactic polypropylene is called.
In a preferred embodiment, the weight ratio of the polyethylene resin to the polypropylene resin in the kraft paper imitation plastic layer is 1 (2-5).
The inventor of the application finds that the polypropylene resin is added into the formula of the kraft paper imitation plastic layer, the polypropylene resin can be well compatible with polyethylene resin, the strength of the packaging bag is effectively improved, but simultaneously, the polypropylene resin is difficult to be mutually fused with the titanium dioxide, lemon yellow and lithol Bao red bk in the application for color matching in a system, so that the application adopts the atactic polypropylene resin, the atactic polypropylene resin can be found to be well used for color matching, and the possible reason is that the regularity of the atactic polypropylene resin is low, and the adhesion between the pigment and the atactic polypropylene resin is enhanced. In addition, the inventors of the present application have unexpectedly found that the surface of the product is not easily discolored after the addition of the random polypropylene resin, and the inventors speculate that the possible reasons are that the methyl side chain part of the random polypropylene resin is more easily oxidized and the probability of forming self hydrogen bonds is reduced during the corona polarity surface treatment of the surface of the kraft paper-like plastic layer. The inventor finds that when the weight ratio of the polyethylene resin to the polypropylene resin is 1 (2-5), the color can be more easily adjusted, and the surface of the product is not easy to fade.
In a preferred embodiment, the polypropylene resin of the woven plastic fabric layer of the present invention is an isotactic polypropylene resin.
In a preferred embodiment, the polypropylene resin of the inventive pure plastic film layer is an isotactic polypropylene resin.
The random polypropylene resin of the invention has a brand number of 5090T and is purchased from Taibo polypropylene (Ningbo) Co Ltd; isotactic polypropylene resin, brand Z30S, was purchased from china petrochemical.
Polyethylene wax
The polyethylene wax (PE wax) is also called polymer wax for short. It is widely used because of its excellent cold resistance, heat resistance, chemical resistance and wear resistance. In normal production, this wax can be added directly to the polyolefin process as an additive, which can increase the gloss and processability of the product. As a lubricant, the lubricant has stable chemical properties and good electrical properties.
The inventor of the application finds that the polyethylene wax can be well dissolved with polyethylene and polypropylene in the formula, and improves the fluidity of the polyethylene and the polypropylene.
The polyethylene WAX of the invention is WAX 200A and is purchased from Fengshun Dongli fine chemical industry Co.
Antioxidant agent
The antioxidants of the present invention, also known as "anti-aging agents", when present in only small amounts in polymer systems, retard or inhibit the progress of the polymer oxidation process, thereby preventing polymer aging and extending its useful life.
In some embodiments, the antioxidant of the present invention is selected from one or more of phenolic antioxidants, amine antioxidants, sulfur antioxidants, phosphite antioxidants.
In a preferred embodiment, the antioxidant of the kraft paper imitation plastic layer is prepared by compounding an antioxidant 1010 and an antioxidant DLTP in a weight ratio of 1: 1.
In a preferred embodiment, the antioxidant is prepared by compounding an antioxidant 1010 and an antioxidant 168 according to a weight ratio of 1: 1.
Titanium white powder
The titanium white powder (TiO) of the invention2) Is an important inorganic chemical product and has important application in the industries of paint, printing ink, paper making, plastic rubber, chemical fiber, ceramic and the like. Titanium dioxide (English name: titanium dioxide) mainly contains titanium dioxide (TiO)2) The white pigment of (2) is a polycrystalline compound having a lattice structure in which dots are arranged regularly.
In a preferred embodiment, the average particle size of the titanium dioxide is 0.22 to 0.26 μm.
The titanium dioxide is purchased from Shanghai Weigu chemical Co.
Lemon yellow
The lemon yellow is also called as tartrazine, acid light yellow and hydrazine yellow. The chemical name is 1- (4-sulfophenyl) -4- (4-sulfophenylazo) -5-pyrazolone-3-carboxylic trisodium salt which is a water-soluble synthetic pigment, is dissolved in water to be yellow, and the water solution of the pigment is still yellow when meeting sulfuric acid, nitric acid, hydrochloric acid and sodium hydroxide. It is mainly used for coloring food, beverage, medicine and cosmetics, and also can be used for dyeing wool and silk and preparing lake. Is generally prepared by diazotizing sulfanilic acid, coupling with 1- (4-sulfophenyl) -3-carboxyl-5-pyrazolone in alkaline solution and refining.
In a preferred embodiment, the lemon yellow has an average particle size of 2 to 10 μm.
The lemon yellow is purchased from Jinan Longteng dye chemical Co., Ltd.
Lixolbe red bk
The lithol rubine bk is mainly used for printing ink, paint, rubber, polyvinyl chloride plastic, wallpaper and the like. Is generally prepared by diazotizing p-toluidine-o-sulfonic acid, coupling with 2-hydroxy-3-naphthoic acid, and converting with calcium chloride into calcium salt.
In a preferred embodiment, the mean particle size of the lithol rubine bk is from 0.1 to 0.3 μm.
In a preferred embodiment, the weight ratio of the titanium dioxide, the lemon yellow and the lithol rubine bk is 1 (0.05-0.1) to (0.01-0.05).
The inventor of the application finds that certain agglomeration effect is generated by adding titanium dioxide and lemon yellow into a formula of a kraft paper imitation plastic layer in the research process, the dispersibility is poor, the color of a packaging bag and the color of original kraft paper are mottled and chromatically different, the inventor then adds the lithol red bk into the formula, and the inventor surprisingly finds that the weight ratio of the titanium dioxide, the lemon yellow and the lithol red bk is 1 (0.05-0.1) (0.01-0.05), the agglomeration is not obvious, the packaging bag is uniform and fine, the color of the packaging bag is not mottled and chromatically different, the inventor conjectures that the possible reason is that the lithol red bk is added and has the interaction of hydrogen bonds with the lemon yellow, so that polyethylene wax adsorbing the lithol red or the lemon yellow is negatively charged, the agglomeration among the polyethylene wax adsorbing the titanium dioxide is reduced, and the polyethylene wax adsorbing the titanium dioxide is uniformly dispersed among the polyethylene wax with the negative charge, so that the colors of the titanium dioxide, in addition, the inventor unexpectedly finds that the product is not easy to fade, and the inventor speculates that the possible reason is that in the process of carrying out corona polar surface treatment on the surface of the kraft paper imitation plastic layer, the interaction force among polar groups after the corona treatment is reduced due to the doping of the titanium dioxide, the corrosion of the corona to the plastic woven cloth layer is effectively shielded, and the strength of the packaging bag is further improved.
The lithol Bao Redka of the present invention is purchased from Shanghai Jianglai Biotech limited.
Carbon black
The carbon black of the present invention, also known as carbon black, is an amorphous carbon. Is light, loose and superfine black powder, has very large surface area and ranges from 10 to 3000m2The carbon-containing substance is a product obtained by incomplete combustion or thermal decomposition of a carbon-containing substance (coal, natural gas, heavy oil, fuel oil, etc.) under the condition of insufficient air.
In a preferred embodiment, the carbon black has an average particle size of 24 to 29 nm.
In a preferred embodiment, the weight ratio of the carbon black, the ultraviolet absorbent and the antioxidant in the plastic woven fabric layer is 1 (0.01-0.1) to (0.01-0.1).
The inventor of the application finds that the carbon black can be effectively protected from light when being added into a formula of a plastic woven fabric layer, but the carbon black is easily agglomerated and difficult to disperse when being added too much, the light protection performance is affected when being added too little, and the ultraviolet resistant agent is inactivated when being reacted with the carbon black when being added too much, so that the ultraviolet resistant performance is weakened when being added too little. The inventor finds that when the weight ratio of the carbon black to the ultraviolet absorbent to the antioxidant is 1 (0.01-0.1) to (0.01-0.1), the packaging bag has better shading rate and ultraviolet resistance, and the inventor speculates that the ultraviolet absorbent used in the invention has a similar structure with the antioxidant, has stronger acting force with each other, and has a certain acting force with the carbon black, so that the surface steric hindrance of the carbon black is increased, the dispersibility is better, and the reaction between the carbon black and the antioxidant is effectively slowed down.
The carbon black of the present invention is purchased from Kjen chemical Co., Ltd.
Ultraviolet absorber
The ultraviolet absorbent is a light stabilizer, can absorb the ultraviolet part in sunlight and a fluorescent light source, and does not change. According to the structure, the compounds can be classified into salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines and the like, and the benzophenones and the benzotriazoles are most applied in industry.
In some embodiments, the UV absorber of the kraft paper-like plastic layer of the invention is selected from the group consisting of 2,2 '-tetramethylene bis (3, 1-benzoxazin-4-one), 2, 8-dimethyl-4H, 6H-benzo (1, 2-d; 5, 4-d') bis (1,3) -oxazine-4, 6-dione, 2-hydroxy-4-methoxy-2 '-carboxybenzophenone, 2' -dihydroxy-4, 4 '-dimethoxybenzophenone, 2-hydroxy-4-benzoyloxybenzophenone, 2', 4,4 '-tetrahydroxybenzophenone, 2' -dihydroxy-4, 4 '-dimethoxybenzophenone, 2' -dimethylene-bis (1, 3-oxa-4-one), 2, 8-dimethyl-4H, 6-benzo (, 2-hydroxy-5-chlorobenzophenone, 2- (2 ' -hydroxy-5 ' -tert-butylphenyl) benzotriazole, 2- (2 ' -hydroxy-5 ' -aminophenyl) benzotriazole, bis (disalicylic) A ester, 2- (2-hydroxy-3, 5-di-tert-amylphenyl) benzotriazole, 2 ' - (1, 4-phenylene) bis-4H-3, 1-benzoxazin-4-one, 2- (2 ' -hydroxy-3 ', 5 ' -dimethylphenyl) benzotriazole, 2- (2 ' -methyl-4 ' -hydroxyphenyl) benzotriazole, bis- (2-methoxy-4-hydroxy-5-benzoylphenyl) methane, bis (2-methoxy-5-hydroxy-5-benzoylphenyl) methane, bis (2-hydroxy-5 ' -tert-butylphenyl) benzotriazole, bis (2 ' -hydroxy-5 ' -aminophenyl) benzotriazole, bis (2-phenyl) s, 2- (2 ' -hydroxy-5-methylphenyl) benzotriazole, 2- (2 ' -hydroxy-5-methylphenyl) -5-carboxylic acid butyl ester benzotriazole, 2-hydroxy-4-alkoxybenzophenone, hexadecyl 3, 5-di-tert-butyl-4-hydroxy-benzoate, tris (1,2,2,6, 6-pentamethyl-4-piperidinyl) phosphite, bis-2, 2,6, 6-tetramethylpiperidinol sebacate, a polymer of succinic acid and 4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidinol, N ' -bis (2,2,6, 6-tetramethyl-4-piperidinyl) -1, 6-hexamethylene diamine, 2, 4-dichloro-6- (1,1,3, 3-tetramethylbutyl) amino-1, 3, 5-triazine, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 6-hexamethylene diamine, and 2, 4-dichloro-6- (4-morpholinyl) -1,3, 5-triazine.
In a preferred embodiment, the UV absorber of the present invention is UV-327, available from Shanghai Aladdin Biotechnology Ltd.
The invention provides a preparation method of an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises the following steps:
(1) drawing: stirring the raw materials for preparing the plastic woven cloth layer according to a certain proportion, heating and extruding the raw materials into a film, cutting the film into strips after cooling the film by a water tank, stretching the film into filaments by 5 to 6 times by a heating oven, forming and cooling the filaments, and rolling the filaments into filament ingots to finish the production of the filament spindles;
(2) weaving: loading the coiled silk spindle on a knitting machine, arranging according to different specifications, weaving into a barrel material in a warp-weft direction in a crossed manner, cutting into pieces by a hot knife, and rolling into a base material cloth roll;
(3) compound bag making: the method comprises the following steps of (1) winding a base material cloth on a compound machine, preheating the base material cloth, enabling the base material cloth to enter a surface layer compound device, stirring raw materials of a kraft paper imitation plastic layer according to a certain proportion, heating the raw materials, extruding and coating the raw materials on a base material, pressing and cooling the raw materials by a specific kraft paper line embossing roller to form a specific surface layer, carrying out corona treatment on the polarity of the surface of the kraft paper, enabling the raw materials of a pure plastic film layer to enter an inner layer compound device, stirring the raw materials of the pure plastic film layer according to a certain proportion;
(4) sewing and heat sealing: and (3) feeding the cylindrical bag into a sewing machine to sew the bottom edge, and then installing the bottom edge in a heat sealing mode to be heat sealed, so as to obtain the environment-friendly light-proof double-layer waterproof packaging bag.
The present invention will now be described in detail by way of examples, and the starting materials used are commercially available unless otherwise specified.
Examples
Example 1
Embodiment 1 provides an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 20g/m270g/m of plastic woven fabric layer2The pure plastic film is 20g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 10 parts of polyethylene resin, 50 parts of polypropylene resin, 0.01 part of polyethylene wax, 0.01 part of antioxidant, 1 part of titanium dioxide, 0.1 part of lemon yellow and 0.05 part of lithol rubine bk.
The preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 10 parts of polyethylene resin, 50 parts of polypropylene resin, 0.01 part of polyethylene wax, 1 part of carbon black, 0.01 part of ultraviolet absorbent and 0.01 part of antioxidant.
The pure plastic film layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin and 50 parts of polypropylene resin.
The polyethylene resin is available under the trade name LDPE 951-000 and purchased from Mount petrochemical company.
The kraft paper imitation plastic layer polypropylene resin is random polypropylene resin.
The polypropylene resin of the plastic woven cloth layer is isotactic polypropylene resin.
The polypropylene resin of the pure plastic film layer is isotactic polypropylene resin.
The random polypropylene resin is 5090T and is purchased from Taibo polypropylene (Ningbo) Co Ltd; isotactic polypropylene resin, brand Z30S, was purchased from china petrochemical.
The polyethylene WAX is WAX 200A and is purchased from Fengshun Dongli fine chemical industry Co.
The antioxidant of the kraft paper imitation plastic layer is obtained by compounding an antioxidant 1010 and an antioxidant DLTP according to the weight ratio of 1: 1.
The antioxidant for the plastic woven cloth layer is obtained by compounding an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 1.
The titanium dioxide has the average particle size of 0.22 mu m and the mark of R-104, and is purchased from Shanghai Weigu chemical Co Ltd.
The lemon yellow has an average particle size of 2 μm and is purchased from Jinan Longteng dye chemical Co.
The mean particle size of the lithol rubine bk is 0.1 μm, and is purchased from Shanghai Jianglai Biotech limited.
The carbon black has an average particle size of 24nm and a mark of MA100, and is purchased from Shanghai Kaiyn chemical Co.
The ultraviolet absorber was UV-327, purchased from Shanghai Aladdin Biotechnology, Inc.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag comprises the following steps:
(1) drawing: stirring the raw materials for preparing the plastic woven cloth layer according to a certain proportion, heating and extruding the raw materials into a film, cutting the film into strips after cooling the film by a water tank, stretching the film into filaments by 5 to 6 times by a heating oven, forming and cooling the filaments, and rolling the filaments into filament ingots to finish the production of the filament spindles;
(2) weaving: loading the coiled silk spindle on a knitting machine, arranging according to different specifications, weaving into a barrel material in a warp-weft direction in a crossed manner, cutting into pieces by a hot knife, and rolling into a base material cloth roll;
(3) compound bag making: the method comprises the following steps of (1) winding a base material cloth on a compound machine, preheating the base material cloth, enabling the base material cloth to enter a surface layer compound device, stirring raw materials of a kraft paper imitation plastic layer according to a certain proportion, heating the raw materials, extruding and coating the raw materials on a base material, pressing and cooling the raw materials by a specific kraft paper line embossing roller to form a specific surface layer, carrying out corona treatment on the polarity of the surface of the kraft paper, enabling the raw materials of a pure plastic film layer to enter an inner layer compound device, stirring the raw materials of the pure plastic film layer according to a certain proportion;
(4) sewing and heat sealing: and (3) feeding the cylindrical bag into a sewing machine to sew the bottom edge, and then installing the bottom edge in a heat sealing mode to be heat sealed, so as to obtain the environment-friendly light-proof double-layer waterproof packaging bag.
Example 2
Embodiment 2 provides an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 50 parts of polyethylene resin, 100 parts of polypropylene resin, 5 parts of polyethylene wax, 0.3 part of antioxidant, 10 parts of titanium dioxide, 1 part of lemon yellow and 1 part of lithol red bk.
The preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 50 parts of polyethylene resin, 98 parts of polypropylene resin, 5 parts of polyethylene wax, 5 parts of carbon black, 0.5 part of ultraviolet absorbent and 0.5 part of antioxidant.
The pure plastic film layer is prepared from the following raw materials in parts by weight: 50 parts of polyethylene resin and 90 parts of polypropylene resin.
The polyethylene resin is available under the trade name LDPE 951-000 and purchased from Mount petrochemical company.
The kraft paper imitation plastic layer polypropylene resin is random polypropylene resin.
The polypropylene resin of the plastic woven cloth layer is isotactic polypropylene resin.
The polypropylene resin of the pure plastic film layer is isotactic polypropylene resin.
The random polypropylene resin is 5090T and is purchased from Taibo polypropylene (Ningbo) Co Ltd; isotactic polypropylene resin, brand Z30S, was purchased from china petrochemical.
The polyethylene WAX is WAX 200A and is purchased from Fengshun Dongli fine chemical industry Co.
The antioxidant of the kraft paper imitation plastic layer is obtained by compounding an antioxidant 1010 and an antioxidant DLTP according to the weight ratio of 1: 1.
The antioxidant for the plastic woven cloth layer is obtained by compounding an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 1.
The titanium dioxide has the average particle size of 0.26 mu m and the mark of R-706, and is purchased from Shanghai Weigu chemical Co Ltd.
The lemon yellow has an average particle size of 10 μm and is purchased from Jinan Longteng dye chemical Co.
The mean particle size of the lithospermum red bk is 0.3 μm, and is purchased from Shanghai Jianglai Biotech limited.
The carbon black has an average particle size of 29nm and a trade mark of MA11, and is purchased from Shanghai Kaiyn chemical Co.
The ultraviolet absorber was UV-327, purchased from Shanghai Aladdin Biotechnology, Inc.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Example 3
Embodiment 3 provides an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 30g/m2The plastic woven cloth layer is 90g/m2The pure plastic film is 30g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin, 60 parts of polypropylene resin, 1 part of polyethylene wax, 0.05 part of antioxidant, 4 parts of titanium dioxide, 0.2 part of lemon yellow and 0.2 part of lithol rubine bk.
The preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 20 parts of polyethylene resin, 60 parts of polypropylene resin, 1 part of polyethylene wax, 2 parts of carbon black, 0.1 part of ultraviolet absorbent and 0.1 part of antioxidant.
The pure plastic film layer is prepared from the following raw materials in parts by weight: 30 parts of polyethylene resin and 60 parts of polypropylene resin.
The polyethylene resin is available under the trade name LDPE 951-000 and purchased from Mount petrochemical company.
The kraft paper imitation plastic layer polypropylene resin is random polypropylene resin.
The polypropylene resin of the plastic woven cloth layer is isotactic polypropylene resin.
The polypropylene resin of the pure plastic film layer is isotactic polypropylene resin.
The random polypropylene resin is 5090T and is purchased from Taibo polypropylene (Ningbo) Co Ltd; isotactic polypropylene resin, brand Z30S, was purchased from china petrochemical.
The polyethylene WAX is WAX 200A and is purchased from Fengshun Dongli fine chemical industry Co.
The antioxidant of the kraft paper imitation plastic layer is obtained by compounding an antioxidant 1010 and an antioxidant DLTP according to the weight ratio of 1: 1.
The antioxidant for the plastic woven cloth layer is obtained by compounding an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 1.
The titanium dioxide has the average particle size of 0.26 mu m and the mark of R-103, and is purchased from Shanghai Weigu chemical Co Ltd.
The lemon yellow has an average particle size of 10 μm and is purchased from Jinan Longteng dye chemical Co.
The mean particle size of the lithospermum red bk is 0.3 μm, and is purchased from Shanghai Jianglai Biotech limited.
The carbon black has an average particle size of 29nm and a trade mark of MA11, and is purchased from Shanghai Kaiyn chemical Co.
The ultraviolet absorber was UV-327, purchased from Shanghai Aladdin Biotechnology, Inc.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Example 4
Embodiment 4 provides an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 40 parts of polyethylene resin, 80 parts of polypropylene resin, 2 parts of polyethylene wax, 0.2 part of antioxidant, 8 parts of titanium dioxide, 0.6 part of lemon yellow and 0.4 part of lithol rubine bk.
The preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 40 parts of polyethylene resin, 90 parts of polypropylene resin, 4 parts of polyethylene wax, 4 parts of carbon black, 0.08 part of ultraviolet absorbent and 0.08 part of antioxidant.
The pure plastic film layer is prepared from the following raw materials in parts by weight: 40 parts of polyethylene resin and 70 parts of polypropylene resin.
The polyethylene resin is available under the trade name LDPE 951-000 and purchased from Mount petrochemical company.
The kraft paper imitation plastic layer polypropylene resin is random polypropylene resin.
The polypropylene resin of the plastic woven cloth layer is isotactic polypropylene resin.
The polypropylene resin of the pure plastic film layer is isotactic polypropylene resin.
The random polypropylene resin is 5090T and is purchased from Taibo polypropylene (Ningbo) Co Ltd; isotactic polypropylene resin, brand Z30S, was purchased from china petrochemical.
The polyethylene WAX is WAX 200A and is purchased from Fengshun Dongli fine chemical industry Co.
The antioxidant of the kraft paper imitation plastic layer is obtained by compounding an antioxidant 1010 and an antioxidant DLTP according to the weight ratio of 1: 1.
The antioxidant for the plastic woven cloth layer is obtained by compounding an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 1.
The titanium dioxide has the average particle size of 0.26 mu m and the mark of R-103, and is purchased from Shanghai Weigu chemical Co Ltd.
The lemon yellow has an average particle size of 10 μm and is purchased from Jinan Longteng dye chemical Co.
The mean particle size of the lithospermum red bk is 0.3 μm, and is purchased from Shanghai Jianglai Biotech limited.
The carbon black has an average particle size of 29nm and a trade mark of MA11, and is purchased from Shanghai Kaiyn chemical Co.
The ultraviolet absorber was UV-327, purchased from Shanghai Aladdin Biotechnology, Inc.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Example 5
Embodiment 5 provides an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin, 73 parts of polypropylene resin, 0.02 part of polyethylene wax, 0.02 part of antioxidant, 6 parts of titanium dioxide, 0.5 part of lemon yellow and 0.12 part of lithol rubine bk.
The preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 20 parts of polyethylene resin, 78 parts of polypropylene resin, 0.02 part of polyethylene wax, 1.5 parts of carbon black, 0.02 part of ultraviolet absorbent and 0.02 part of antioxidant.
The pure plastic film layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin and 80 parts of polypropylene resin.
The polyethylene resin is available under the trade name LDPE 951-000 and purchased from Mount petrochemical company.
The kraft paper imitation plastic layer polypropylene resin is random polypropylene resin.
The polypropylene resin of the plastic woven cloth layer is isotactic polypropylene resin.
The polypropylene resin of the pure plastic film layer is isotactic polypropylene resin.
The random polypropylene resin is 5090T and is purchased from Taibo polypropylene (Ningbo) Co Ltd; isotactic polypropylene resin, brand Z30S, was purchased from china petrochemical.
The polyethylene WAX is WAX 200A and is purchased from Fengshun Dongli fine chemical industry Co.
The antioxidant of the kraft paper imitation plastic layer is obtained by compounding an antioxidant 1010 and an antioxidant DLTP according to the weight ratio of 1: 1.
The antioxidant for the plastic woven cloth layer is obtained by compounding an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 1.
The titanium dioxide has the average particle size of 0.23 mu m and the mark of R-103, and is purchased from Shanghai Weigu chemical Co Ltd.
The lemon yellow has an average particle size of 5 μm and is purchased from Jinan Longteng dye chemical Co.
The mean particle size of the lithospermum red bk is 0.2 μm, and is purchased from Shanghai Jianglai Biotech limited.
The carbon black has an average particle size of 24nm and a mark of MA100, and is purchased from Shanghai Kaiyn chemical Co.
The ultraviolet absorber was UV-327, purchased from Shanghai Aladdin Biotechnology, Inc.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 1
Comparative example 1 provides an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 73 parts of polyethylene resin, 73 parts of polypropylene resin, 0.02 part of polyethylene wax, 0.02 part of antioxidant, 6 parts of titanium dioxide, 0.5 part of lemon yellow and 0.12 part of lithol rubine bk.
The raw materials and the respective parts by weight of the plastic woven cloth layer are the same as those in example 5.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 2
Comparative example 2 provides an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin, 150 parts of polypropylene resin, 0.02 part of polyethylene wax, 0.02 part of antioxidant, 6 parts of titanium dioxide, 0.5 part of lemon yellow and 0.12 part of lithol rubine bk.
The raw materials and the respective parts by weight of the plastic woven cloth layer are the same as those in example 5.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 3
Comparative example 3 provides an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The preparation raw materials and the respective parts by weight of the kraft paper imitation plastic layer are the same as those in example 5, except that the kraft paper imitation plastic layer polypropylene resin is isotactic polypropylene resin with the trade name of Z30S, and is purchased from China petrochemical.
The raw materials and the respective parts by weight of the plastic woven cloth layer are the same as those in example 5.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 4
Comparative example 4 provides an environmentally friendly light-resistant double-layered waterproof packaging bag comprising a surface layer, a middle layer, and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin, 73 parts of polypropylene resin, 0.02 part of polyethylene wax, 0.02 part of antioxidant, 0.1 part of titanium dioxide, 0.5 part of lemon yellow and 0.12 part of lithol Bao red bk.
The raw materials and the respective parts by weight of the plastic woven cloth layer are the same as those in example 5.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 5
Comparative example 5 provides an environmentally friendly light-resistant double-layered waterproof packaging bag comprising a surface layer, a middle layer, and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin, 73 parts of polypropylene resin, 0.02 part of polyethylene wax, 0.02 part of antioxidant, 30 parts of titanium dioxide, 0.5 part of lemon yellow and 0.12 part of lithol rubine bk.
The raw materials and the respective parts by weight of the plastic woven cloth layer are the same as those in example 5.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 6
Comparative example 6 provides an environmentally friendly light-resistant double-layered waterproof packaging bag comprising a surface layer, a middle layer, and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin, 73 parts of polypropylene resin, 0.02 part of polyethylene wax, 0.02 part of antioxidant, 6 parts of titanium dioxide, 0.01 part of lemon yellow and 0.12 part of lithol rubine bk.
The raw materials and the respective parts by weight of the plastic woven cloth layer are the same as those in example 5.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 7
Comparative example 7 provides an environment-friendly light-resistant double-layer waterproof packaging bag, which comprises a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin, 73 parts of polypropylene resin, 0.02 part of polyethylene wax, 0.02 part of antioxidant, 6 parts of titanium dioxide, 20 parts of lemon yellow and 0.12 part of lithol rubine bk.
The raw materials and the respective parts by weight of the plastic woven cloth layer are the same as those in example 5.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 8
Comparative example 8 provides an environmentally friendly light-resistant double-layered waterproof packaging bag comprising a surface layer, a middle layer, and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin, 73 parts of polypropylene resin, 0.02 part of polyethylene wax, 0.02 part of antioxidant, 6 parts of titanium dioxide, 0.5 part of lemon yellow and 0 part of lithol rubine bk.
The raw materials and the respective parts by weight of the plastic woven cloth layer are the same as those in example 5.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 9
Comparative example 9 provides an environmentally friendly light-resistant double-layered waterproof packaging bag comprising a surface layer, a middle layer, and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 20 parts of polyethylene resin, 73 parts of polypropylene resin, 0.02 part of polyethylene wax, 0.02 part of antioxidant, 6 parts of titanium dioxide, 0.5 part of lemon yellow and 20 parts of lithol rubine bk.
The raw materials and the respective parts by weight of the plastic woven cloth layer are the same as those in example 5.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 10
Comparative example 10 provides an environmentally friendly light-resistant double-layered waterproof packaging bag comprising a surface layer, a middle layer, an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The raw materials and the respective parts by weight of the kraft paper imitation plastic layer are the same as those in example 5.
The preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 20 parts of polyethylene resin, 78 parts of polypropylene resin, 0.02 part of polyethylene wax, 1.5 parts of carbon black, 0 part of ultraviolet absorbent and 0.02 part of antioxidant.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 11
Comparative example 11 provides an environmentally friendly light-resistant double-layered waterproof packaging bag comprising a surface layer, a middle layer, an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The raw materials and the respective parts by weight of the kraft paper imitation plastic layer are the same as those in example 5.
The preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 20 parts of polyethylene resin, 78 parts of polypropylene resin, 0.02 part of polyethylene wax, 1.5 parts of carbon black, 10 parts of ultraviolet absorbent and 0.02 part of antioxidant.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 12
Comparative example 12 provides an environmentally friendly light-resistant double-layered waterproof packaging bag comprising a surface layer, a middle layer, an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The raw materials and the respective parts by weight of the kraft paper imitation plastic layer are the same as those in example 5.
The preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 20 parts of polyethylene resin, 78 parts of polypropylene resin, 0.02 part of polyethylene wax, 1.5 parts of carbon black, 0.02 part of ultraviolet absorbent and 0 part of antioxidant.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 13
Comparative example 13 provides an environmentally friendly light-resistant double-layered waterproof packaging bag comprising a surface layer, a middle layer, an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer.
The kraft paper imitation plastic layer is 25g/m2The plastic woven cloth layer is 80g/m2The pure plastic film is 25g/m2。
The raw materials and the respective parts by weight of the kraft paper imitation plastic layer are the same as those in example 5.
The preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 20 parts of polyethylene resin, 78 parts of polypropylene resin, 0.02 part of polyethylene wax, 1.5 parts of carbon black, 0.02 part of ultraviolet absorbent and 10 parts of antioxidant.
The raw materials and the respective parts by weight of the pure plastic film layer were the same as in example 5.
The preparation method of the environment-friendly light-proof double-layer waterproof packaging bag is the same as that of the embodiment 1.
Comparative example 14
Comparative example 14 is a paper-plastic composite bag of a certain brand commonly found in the market, the surface layer is kraft paper, the middle layer is plastic bonded, and the inner layer is woven cloth.
Evaluation of Performance
1. Appearance evaluation: and (5) observing whether the surface of the product has color spots or not by naked eyes, and comparing with kraft paper to determine whether color difference exists or not.
2. Evaluation of non-fading: the test was performed according to the Baige test method standard.
3. And (3) testing ultraviolet resistance: the test was performed according to GBT 16422.3-2014 standard.
4. Testing the shading rate: testing by LH-122 type shading rate measuring instrument.
5. And (3) testing mechanical strength: the test was carried out according to GB/T8946-2013 standard.
TABLE 1
Figure BDA0001822324250000201
TABLE 2
Figure BDA0001822324250000202
Figure BDA0001822324250000211

Claims (5)

1. An environment-friendly light-resistant double-layer waterproof packaging bag is characterized by comprising a surface layer, a middle layer and an inner layer; the surface layer is a kraft paper imitation plastic layer, the middle layer is a plastic woven cloth layer, and the inner layer is a pure plastic film layer;
the kraft paper imitation plastic layer is prepared from the following raw materials in parts by weight: 10-50 parts of polyethylene resin, 50-100 parts of polypropylene resin, 0.01-5 parts of polyethylene wax, 0.01-0.3 part of antioxidant, 1-10 parts of titanium dioxide, 0.1-1 part of lemon yellow and 0.05-1 part of lithol red bk; the polypropylene resin is a random polypropylene resin;
the kraft paper imitation plastic layer is prepared from the following raw materials: the weight ratio of the polyethylene resin to the polypropylene resin is 1: (2-5); the weight ratio of the titanium dioxide, the lemon yellow and the lithol Bao red bk is 1: (0.05-0.1): (0.01-0.05); the antioxidant is obtained by compounding an antioxidant 1010 and an antioxidant DLTP according to the weight ratio of 1: 1;
the preparation raw materials of the plastic woven fabric layer comprise the following components in parts by weight: 10-50 parts of polyethylene resin, 50-98 parts of polypropylene resin, 0.01-5 parts of polyethylene wax, 1-5 parts of carbon black, 0.01-0.5 part of ultraviolet absorbent and 0.01-0.5 part of antioxidant;
the plastic woven fabric layer is prepared from the following raw materials: the weight ratio of the carbon black, the ultraviolet absorbent and the antioxidant is 1 (0.01-0.1) to 0.01-0.1; the antioxidant is obtained by compounding an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 1; the ultraviolet absorbent is UV-327.
2. The environment-friendly and light-proof double-layer waterproof packaging bag according to claim 1, wherein the kraft paper imitation plastic layer is 20-30g/m in terms of square gram weight2The plastic woven cloth layer is 70-90g/m2The pure plastic film layer is 20-30g/m2。
3. The environment-friendly light-resistant double-layer waterproof packaging bag according to claim 1, wherein the pure plastic film layer is prepared from the following raw materials in parts by weight: 20-50 parts of polyethylene resin and 50-90 parts of polypropylene resin.
4. The environment-friendly light-resistant double-layer waterproof packaging bag according to claim 1, wherein the average particle size of the titanium dioxide is 0.22-0.26 um.
5. The preparation method of the environment-friendly light-resistant double-layer waterproof packaging bag according to claim 3, which is characterized by comprising the following steps:
(1) drawing: stirring the raw materials for preparing the plastic woven cloth layer according to a certain proportion, heating and extruding the raw materials into a film, cutting the film into strips after cooling the film by a water tank, stretching the film into filaments by 5 to 6 times by a heating oven, forming and cooling the filaments, and rolling the filaments into filament ingots to finish the production of the filament spindles;
(2) weaving: loading the coiled silk spindle on a knitting machine, arranging according to different specifications, weaving into a barrel material in a warp-weft direction in a crossed manner, cutting into pieces by a hot knife, and rolling into a base material cloth roll;
(3) compound bag making: the method comprises the following steps of (1) winding a base material cloth on a compound machine, preheating the base material cloth, enabling the base material cloth to enter a surface layer compound device, stirring raw materials of a kraft paper imitation plastic layer according to a certain proportion, heating the raw materials, extruding and coating the raw materials on a base material, pressing and cooling the raw materials by a specific kraft paper line embossing roller to form a specific surface layer, carrying out corona treatment on the polarity of the surface of the kraft paper, enabling the raw materials of a pure plastic film layer to enter an inner layer compound device, stirring the raw materials of the pure plastic film layer according to a certain proportion;
(4) sewing and heat sealing: and (3) feeding the cylindrical bag into a sewing machine to sew the bottom edges, and connecting the bottom edges in a heat sealing mode to obtain the environment-friendly and light-proof double-layer waterproof packaging bag.
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