CN111849011A - Preparation method of high-barrier recyclable plastic and composite hose - Google Patents
Preparation method of high-barrier recyclable plastic and composite hose Download PDFInfo
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- CN111849011A CN111849011A CN202010792763.XA CN202010792763A CN111849011A CN 111849011 A CN111849011 A CN 111849011A CN 202010792763 A CN202010792763 A CN 202010792763A CN 111849011 A CN111849011 A CN 111849011A
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- plastic
- polyvinyl alcohol
- coating
- barrier
- film
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- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/048—Forming gas barrier coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/20—Flexible squeeze tubes, e.g. for cosmetics
-
- 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
- B32B1/00—Layered products having a non-planar shape
- B32B1/08—Tubular products
-
- 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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- 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
- B32B2597/00—Tubular articles, e.g. hoses, pipes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The embodiment of the application provides a preparation method of high-barrier recyclable plastic and a composite hose, and relates to the technical field of plastic products. The preparation method of the high-barrier recyclable plastic comprises polyvinyl alcohol and a plastic substrate, and comprises the following steps: coating a polyvinyl alcohol aqueous solution on the plastic substrate by a coater; drying the plastic base material in the coating process of the coating machine, and forming a polyvinyl alcohol coating on the plastic base material, wherein the content ratio of the polyvinyl alcohol in the plastic is not higher than 5%. The plastic sheet prepared by the preparation method of the high-barrier recyclable plastic can realize high-barrier performance, and simultaneously realize the technical effects of recycling and improving environmental protection efficiency.
Description
Technical Field
The application relates to the technical field of plastic products, in particular to a preparation method of high-barrier recyclable plastic and a composite hose.
Background
The prior toothpaste tube or cosmetic tube and the like mainly comprise a tube body, a tube shoulder and a tube cap; wherein, the tube body of the hose is mainly an aluminum-plastic sheet, a full-plastic sheet, a barrier-free spacer and the like, and cannot be directly recycled; the pipe shoulder and the pipe cap of the hose are mainly made of high-density polyethylene at present, and the pipe cap is made of polypropylene and cannot be recycled; in addition, the barrier-free spacer material has a certain recyclability, but the barrier-free spacer material does not have a fragrance retaining property.
Among the prior art, the degree of attention to environmental protection material is higher and higher, and is bigger and bigger to degradable material, repeatedly usable material, recoverable material demand, and need guarantee plastic hose as the barrier property of packagine product under the prerequisite of guaranteeing that plastic hose retrieves easily, does not have better solution at present.
Disclosure of Invention
The embodiment of the application aims to provide a preparation method of high-barrier recyclable plastic and a composite hose, which can realize high-barrier performance, realize recycling and improve the technical effects of environmental protection.
In a first aspect, embodiments of the present application provide a method for preparing a high barrier recyclable plastic, the plastic comprising polyvinyl alcohol and a plastic substrate, the method comprising:
coating a polyvinyl alcohol aqueous solution on the plastic substrate by a coater;
drying the plastic base material in the coating process of the coating machine, and forming a polyvinyl alcohol coating on the plastic base material, wherein the content ratio of the polyvinyl alcohol in the plastic is not higher than 5%.
In the implementation process, the preparation method of the high-barrier recyclable plastic adopts polyvinyl alcohol as a barrier layer, and the polyvinyl alcohol is coated on the plastic substrate by a coating machine coating method to replace various barrier materials such as aluminum foil, ethylene-vinyl alcohol copolymer, aluminum-plated film and the like; the polyvinyl alcohol is an environment-friendly degradable material, has good barrier property and aroma-keeping property, can be made into a packaging hose with high barrier property and aroma-keeping property by matching with a plastic base material, and the content proportion of the polyvinyl alcohol in the plastic is not higher than 5 percent, and can be mass proportion, so that the recyclable standard of plastic products is met; the waste plastic can be reused as a production raw material after being recycled and cleaned, so that the aim of recycling one hundred percent is fulfilled, and the existing packaging hose is replaced; therefore, the packaging hose manufactured by the high-barrier recyclable plastic preparation method can realize high barrier performance, and meanwhile, the technical effects of recycling and improving environmental protection efficiency are realized.
Further, the polyvinyl alcohol coating has a thickness of no more than 1 μm.
In the implementation process, after the coating of the coating machine, the thickness of the polyvinyl alcohol coating is not more than 1 μm, so that high barrier property and high fragrance retention can be realized, and the polyvinyl alcohol coating is used as a material of the barrier layer to realize high barrier property and fragrance retention.
Further, the plastic substrate comprises a polypropylene film.
In the implementation process, the polypropylene film can be a biaxially oriented polypropylene film, a multilayer co-extruded film, and is prepared by co-extruding polypropylene particles to form a sheet and then stretching the sheet in longitudinal and transverse directions. Because of the stretching molecular orientation, the film has good physical stability, mechanical strength and air tightness, high transparency and glossiness, toughness and wear resistance.
Further, the plastic substrate includes a polyester film.
In the realization process, the polyester film is a film material which is prepared by using polyethylene glycol terephthalate as a raw material, preparing a thick sheet by adopting an extrusion method and performing biaxial tension. The polyester film is used as a printing packaging consumable material of an environment-friendly film, such as a PET film, a milky white film and the like, is usually a colorless, transparent and glossy film (additive particles can be added to make the film have colors), and has the advantages of excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature resistance, low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention.
Further, the plastic substrate comprises a polyethylene film.
In the implementation process, the polyethylene film is a film produced by polyethylene, and has moisture resistance and small moisture permeability; the polyethylene film can be made into products with different performances such as low-density, medium-density and high-density polyethylene, crosslinked polyethylene and the like according to different manufacturing methods and control means.
In a second aspect, embodiments of the present application provide a composite hose including a plastic sheet made by the method for preparing high-barrier recyclable plastic according to any one of the first aspect.
Further, the composite hose comprises a hose body, wherein the plastic base material of the hose body is high-density polyethylene, and the hose body comprises an inner layer and an outer layer.
In the implementation process, the high-density ethylene environment-friendly material is heated to reach the melting point, and can be recycled.
Further, the outer layer surface of the pipe body is provided with a polyvinyl alcohol coating.
In the implementation process, the polyvinyl alcohol coating is arranged on the outer layer of the high-density polyethylene film, and because the polyvinyl alcohol is an environment-friendly degradable material, when the polyvinyl alcohol coating is used as the outer layer surface, patterns, polishing oil and the like can be printed on the surface, and the polyvinyl alcohol coating can be used as a printing layer, can keep high barrier property and can be recycled, so that the technical effect of improving the environment-friendly efficiency is realized.
Further, a polyvinyl alcohol coating is arranged between the inner layer and the outer layer of the pipe body.
In the implementation process, the high-barrier recyclable plastic can be prepared by various processes, such as extrusion compounding, film blowing, injection molding or hollow blow molding, and the like, and the polyvinyl alcohol coating is arranged between the inner layer and the outer layer and can replace aluminum foil, ethylene-vinyl alcohol copolymer and the like; because the polyvinyl alcohol coating thickness can be not more than 1um, can keep good separation nature and fragrance keeping nature, and polyvinyl alcohol is the degradable material of environmental protection, when the polyvinyl alcohol coating was as the intermediate level of pipe shaft sheet, can realize high separation performance, realized recycling simultaneously, improved environmental protection efficiency's technological effect.
Further, the composite hose also comprises a pipe cap and a pipe shoulder, wherein the pipe shoulder is welded with the pipe body, the pipe cap and the pipe shoulder can be fastened or separated with each other, the pipe cap and the pipe shoulder are made of high-density polyethylene, and the melting finger and the density of the pipe cap and the pipe shoulder are the same as those of the pipe body.
In the implementation process, the existing packaging hose field is generally prepared by adopting an extrusion compounding or film blowing process, and the materials of the tube shoulder and the tube cap are different from the materials of the tube body, for example, the tube shoulder is made of high-density polyethylene with different melt fingers and densities, and the tube cap is made of polypropylene, so that the recycling of the packaging hose is difficult; the composite hose can be prepared by various processes, such as extrusion compounding, film blowing, injection molding or hollow blow molding, for example, the composite hose is prepared by an injection molding process, high-density polyethylene with the same melt index and density as those of the hose body is used for replacing high-density polyethylene of the hose shoulder and polypropylene material of the hose cap, and the high-density polyethylene is kept consistent with the melt index/density of the high-density polyethylene when HDPE (high-density polyethylene) bottles are blow molded in a hollow mode, so that the materials of the hose cap, the hose shoulder and the hose body in the composite hose are kept consistent and can be completely recycled, and the composite hose can be reused as a raw material for hollow blow molding after being cleaned, so that the purpose of 100% recycling is achieved, and the environmental protection efficiency is improved.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic flow chart of a method for preparing high barrier recyclable plastic according to an embodiment of the present disclosure;
FIG. 2 is a schematic block diagram of a composite hose according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a pipe body according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or a point connection; either directly or indirectly through intervening media, or may be an internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
The embodiment of the application provides a preparation method of high-barrier recyclable plastic and a composite hose, which can be applied to daily necessity packaging, such as toothpaste tubes or cosmetic tubes; the preparation method of the high-barrier recyclable plastic adopts polyvinyl alcohol as a barrier layer, and the polyvinyl alcohol is coated on a plastic substrate by a coating method of a coating machine; the polyvinyl alcohol is an environment-friendly degradable material, has good barrier property and aroma-keeping property, can be made into a packaging hose with high barrier property and aroma-keeping property by matching with a plastic base material, can be recycled and cleaned, and then is used as a production raw material again, so that the aim of completely recycling is fulfilled, and the existing packaging hose is replaced; therefore, the packaging hose manufactured by the high-barrier recyclable plastic preparation method can realize high barrier performance, and meanwhile, the technical effects of recycling and improving environmental protection efficiency are realized.
In some embodiments, the polyvinyl alcohol is coated on the plastic substrate, the content ratio of the polyvinyl alcohol in the plastic is not higher than 5%, in other words, the content ratio of the plastic substrate is more than 95%, and after the plastic is recycled and cleaned, the plastic can be reused as a production raw material, so that one hundred percent of recycling is achieved. Illustratively, when the plastic base material is high-density polyethylene (HDPE), the content of the high-density polyethylene (HDPE) in the whole plastic is more than 95%, and the high-density polyethylene (HDPE) can be reused as a production raw material for plastic processing technologies such as bottle blowing, film blowing, injection molding, hollow blow molding and the like after being recovered and cleaned; the same applies to the case where the plastic substrate is a material such as PP or PET.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for preparing a high-barrier recyclable plastic, which includes polyvinyl alcohol and a plastic substrate, according to an embodiment of the present disclosure, and the method for preparing the high-barrier recyclable plastic includes:
s100: the aqueous polyvinyl alcohol solution was coated on the plastic substrate by a coater.
Illustratively, Polyvinyl alcohol (PVOH) is an organic compound that is normally a white flaky, flocculent, or powdery solid, and is odorless. Is soluble in water (above 95 deg.C), slightly soluble in dimethyl sulfoxide, and insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, and ethylene glycol. Polyvinyl alcohol is an important chemical raw material, and is used for manufacturing polyvinyl acetal, gasoline-resistant pipelines, vinylon synthetic fibers, fabric treating agents, emulsifiers, paper coatings, adhesives, glue and the like.
The polyvinyl alcohol is the only vinyl polymer which can be used as a carbon source and an energy source by bacteria at present, can be degraded by 75% in 46 days under the action of the bacteria and the enzyme, belongs to a biodegradable high polymer material, can be produced in a large scale by a non-petroleum route, is low in price, has superior oil resistance, solvent resistance and gas barrier property, and has unique advantages in the aspects of food and medicine packaging. Alternatively, the use of polyvinyl alcohol is based on a solution process, producing a film material by casting into a film.
Illustratively, polyvinyl alcohol, when used as a packaging material, is non-toxic, non-irritating to human skin, and has good barrier and fragrance-retaining properties.
Illustratively, a coater is a method of applying a paste polymer, a molten polymer or a polymer melt to paper, cloth, or a plastic film to obtain a composite (film) using a coating technique. The polyvinyl alcohol can be conveniently coated on the plastic base material through the coating machine to prepare the plastic composite material.
S200: drying the plastic base material in the coating process of the coating machine, and forming a polyvinyl alcohol coating on the plastic base material, wherein the content ratio of the polyvinyl alcohol in the plastic is not higher than 5%.
Illustratively, in the process of coating the polyvinyl alcohol aqueous solution on the plastic substrate, the polyvinyl alcohol aqueous solution and the plastic substrate can be dried simultaneously, so that the polyvinyl alcohol and the plastic substrate are tightly combined together, and a polyvinyl alcohol coating is formed on the plastic substrate, which are combined into a whole and used as a packaging material for preparing a packaging hose, such as a toothpaste tube, a cosmetic tube and the like; in addition, the content ratio of the polyvinyl alcohol in the plastic is not higher than 5%, which can be referred to as a mass ratio, and meets the recyclable standard for plastic products.
In some implementation scenarios, the packaging hose prepared by the high-barrier recyclable plastic preparation method can be applied to daily product packaging, such as toothpaste tubes or cosmetic tubes; the preparation method of the high-barrier recyclable plastic adopts polyvinyl alcohol as a barrier layer, and the polyvinyl alcohol is coated on a plastic substrate by a coating method of a coating machine to replace various barrier materials such as aluminum foil, ethylene-vinyl alcohol copolymer, aluminum-plated film and the like; the polyvinyl alcohol is an environment-friendly degradable material, has good barrier property and aroma-keeping property, can be made into a packaging hose with high barrier property and aroma-keeping property by matching with a plastic base material, can be reused as a production raw material after being recycled and cleaned, achieves the aim of recycling one hundred percent, and replaces the existing packaging hose; therefore, the packaging hose manufactured by the high-barrier recyclable plastic preparation method can realize high barrier performance, and meanwhile, the technical effects of recycling and improving environmental protection efficiency are realized.
In some embodiments, the polyvinyl alcohol coating has a thickness of no greater than 1 μm.
Illustratively, after coating by a coating machine, the thickness of the polyvinyl alcohol coating is not more than 1 μm, and high barrier property and high fragrance retention can be realized.
Alternatively, the plastic substrate may be a thin film of various single plastic materials, for example, one of a polypropylene film, a polyester film, a nylon film, a polyethylene film.
In some embodiments, the plastic substrate comprises a polypropylene film.
Illustratively, polypropylene is a polymer resulting from the addition polymerization of propylene. Is white wax-like material, and has transparent and light appearance. The density is 0.89-0.91 g/cm3, the flame retardant is flammable, the melting point is 165 ℃, the softening temperature is about 155 ℃, and the use temperature range is-30-140 ℃. Can resist corrosion of acid, alkali, salt solution and various organic solvents at the temperature of below 80 ℃, and can be decomposed at high temperature and under the action of oxidation. The polypropylene is widely applied to the production of fiber products such as clothes, blankets and the like, medical instruments, automobiles, bicycles, parts, conveying pipelines, chemical containers and the like, and is also used for packaging foods and medicines.
In some embodiments, the polypropylene film may be a biaxially oriented polypropylene film (BOPP), which is a multilayer co-extruded film and is prepared by co-extruding polypropylene particles to form a sheet, and then stretching the sheet in two directions, i.e., in the longitudinal direction and the transverse direction. Due to the stretching molecular orientation, the film has good physical stability, mechanical strength and air tightness, high transparency and glossiness, toughness and wear resistance, is the most widely used printing film at present, and is generally 20-40 μm in thickness and 20 μm in most wide application. The biaxially oriented polypropylene film has the main defect of poor heat sealability, so that the biaxially oriented polypropylene film is generally used as an outer film of a composite film, is ideal in moisture resistance, transparency, strength, stiffness and printability after being compounded with a polyethylene film, and is suitable for containing dry food. Because the surface of the biaxially oriented polypropylene film is nonpolar, high in crystallinity and low in surface free energy, the biaxially oriented polypropylene film is poor in printing performance and poor in adhesion to ink and adhesives, and needs to be subjected to surface treatment before printing and compounding.
In some embodiments, the plastic substrate comprises a polyester film.
Illustratively, polyesters, polymers obtained by polycondensation of polyhydric alcohols and polybasic acids, are collectively referred to as "polyesters". Mainly polyethylene terephthalate (PET), and conventionally includes linear thermoplastic resins such as polybutylene terephthalate (PBT) and polyarylate. Is an engineering plastic with excellent performance and wide application. It can also be made into polyester fiber and polyester film. Polyesters include polyester resins and polyester elastomers. The polyester resin further includes polyethylene terephthalate (PET), polybutylene terephthalate (PBT), Polyarylate (PAR), and the like. Polyester elastomers (TPEE) are generally polymerized from dimethyl terephthalate, 1, 4-butanediol and polybutanol, and the segment comprising a hard segment portion and a soft segment portion is a thermoplastic elastomer.
The polyester film is a film material prepared by using polyethylene terephthalate as a raw material, making a thick sheet by an extrusion method, and performing biaxial stretching. The polyester film is used as a printing packaging consumable material such as an environment-friendly film PET film milky white film and the like, is usually a colorless, transparent and glossy film (the polyester film can be colored by adding additive particles), has excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature resistance and low temperature resistance, and good chemical resistance, oil resistance, air tightness and aroma retention, is one of common barrier composite film base materials, but has poor corona resistance.
In some embodiments, the plastic substrate comprises a polyethylene film.
Illustratively, Polyethylene (PE) is a thermoplastic resin obtained by polymerizing ethylene. In industry, copolymers of ethylene with small amounts of alpha-olefins are also included. The polyethylene is odorless and nontoxic, feels like wax, has excellent low-temperature resistance (the lowest use temperature can reach-100 to-70 ℃), has good chemical stability, and can resist corrosion of most of acid and alkali (cannot resist acid with oxidation property). Is insoluble in common solvents at room temperature, has low water absorption and excellent electrical insulation. The polyethylene film is a film produced by polyethylene, and has moisture resistance and small moisture permeability; the polyethylene film can be made into products with different performances such as low-density, medium-density and high-density polyethylene, crosslinked polyethylene and the like according to different manufacturing methods and control means.
The embodiment of the application provides a composite hose, which is prepared by adopting a plastic sheet prepared by a high-barrier recyclable plastic preparation method shown in figure 1.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a composite hose provided in an embodiment of the present application, and the composite hose includes a pipe cap 100, a pipe shoulder 200, and a pipe body 300.
Illustratively, the composite hose includes a body 300, and the plastic substrate of the body 300 is high density polyethylene.
Illustratively, the High Density Polyethylene (HDPE) is a white powder or granular product. No toxicity and no smell, the crystallinity is 80-90%, the softening point is 125-l 35 ℃, and the use temperature can reach 100 ℃; the hardness, tensile strength and creep property are better than those of low-density polyethylene; the wear resistance, the electrical insulation, the toughness and the cold resistance are good; the chemical stability is good, and the paint is not dissolved in any organic solvent at room temperature, and is resistant to corrosion of acid, alkali and various salts; the film has small permeability to water vapor and air and low water absorption; the aging resistance is poor, and the environmental stress cracking resistance is inferior to that of the low density polyethylene. In addition, the high-density ethylene environment-friendly material can be recycled after being heated to reach the melting point.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a tube body according to an embodiment of the present disclosure, in which the tube body 300 includes an inner layer 310, an outer layer 320, and an intermediate layer 330.
Illustratively, the inner layer 310, the outer layer 320, and the intermediate layer 330 are all made of 100% high density polyethylene. Alternatively, the tube body 300 is prepared by an extrusion compounding process, and the intermediate layer 330 is a curtain coating.
In some embodiments, the outer layer 320 surface of the shaft 300 has a polyvinyl alcohol coating.
Illustratively, the polyvinyl alcohol coating is on the high-density polyethylene film of the outer layer 320, since the polyvinyl alcohol is an environmentally-friendly degradable material, when the polyvinyl alcohol coating is used as the surface of the outer layer 320, the surface can be printed with patterns, glazed oil and the like, and the polyvinyl alcohol coating can be used as a printing layer while maintaining high barrier property, and can be recycled, thereby achieving the technical effect of improving environmental protection efficiency.
In some embodiments, the body 300 has a polyvinyl alcohol coating between the inner layer 310 and the outer layer 320.
Illustratively, the high barrier recyclable plastic may be prepared by a variety of processes, such as extrusion lamination, blown film, injection molding, or hollow blow molding, for example, via a hollow blow molding process, with a polyvinyl alcohol coating between the inner layer 310 and the outer layer 320, instead of aluminum foil, ethylene-vinyl alcohol copolymer, or the like; because the polyvinyl alcohol coating thickness can be not more than 1um, can keep good separation nature and fragrance-retaining nature, and polyvinyl alcohol is the degradable material of environmental protection, when the polyvinyl alcohol coating was as the intermediate level of pipe shaft 300 sheet, can realize high separation performance, realized recycling simultaneously, improved environmental protection efficiency's technological effect.
In some embodiments, the composite hose further comprises a cap 100 and a shoulder 200, the shoulder 200 is welded to the body 300, the cap 100 and the shoulder 200 can be fastened to or separated from each other, the cap 100 and the shoulder 200 are made of high density polyethylene, and the melt index and density of the cap 100 and the shoulder 200 are the same as those of the body 300.
For example, in the existing packaging hose field, extrusion compounding or film blowing processes are generally used for preparing the packaging hose, and the materials of the tube shoulder 200 and the tube cap 100 are different from the materials of the tube body 300, for example, the tube shoulder 200 is made of high-density polyethylene with different melt fingers and different densities, and the tube cap 100 is made of polypropylene, so that the recycling of the packaging hose is difficult; the high-density polyethylene with the same melt index and density as the pipe body 300 is used for replacing the high-density polyethylene of the pipe shoulder 200 and the polypropylene material of the pipe cap 100, and simultaneously the melt index/density of the high-density polyethylene during hollow blow molding is kept consistent, so that the materials of the pipe cap 100, the pipe shoulder 200 and the pipe body 300 in the composite hose are kept consistent and can be completely recycled, and the materials can be used as raw materials for hollow blow molding after being cleaned, so that the purpose of 100% recycling is achieved, and the environmental protection efficiency is improved.
In some embodiments, the composite hose can be prepared and produced in a solvent-free composite mode, so that the production efficiency and the production yield can be effectively improved. In an exemplary manner, the first and second electrodes are,replacing a laminating process of extruding and laminating with solvent-free polyurethane glue; the solvent-free gluing is carried out, the five-roller coating is carried out, and then the compounding is carried out, and the gluing amount of the glue is only 1 to 3g/m2The thickness is only 2-4 mu m, and is reduced by at least 90% compared with the thickness of the laminated film, so that the cost is greatly reduced.
In some implementation scenes, the polyvinyl alcohol aqueous solution can be coated on various plastic base materials through a coating machine and dried, and the thickness of the coated polyvinyl alcohol coating is not more than 1um, so that better barrier property and aroma retention property can be realized; polyvinyl alcohol is used as a barrier layer, and can be coated on various substrates such as polypropylene films, polyester films, nylon films, polyethylene films, etc., instead of various barrier materials such as aluminum foils, ethylene-vinyl alcohol copolymers, aluminum-plated films, etc.
In the application of the composite hose, the polyvinyl alcohol coating is coated on the high-density polyethylene film, and can replace aluminum foil and ethylene-vinyl alcohol copolymer to be used as a barrier layer; the thickness of the polyvinyl alcohol coating is not more than 1um, so that good barrier property and fragrance retention property can be kept, and the polyvinyl alcohol is an environment-friendly degradable material; the polyvinyl alcohol coating may be on the middle layer 330 of the sheet material of the pipe body 300, or may be on the surface of the outer layer 320 of the sheet material of the pipe body 300, and patterns, varnish, etc. may be printed on the surface of the coating.
In addition, the sheet material of the tube body 300 is made of high density polyethylene instead of the high density polyethylene + low density polyethylene of the inner and outer films; simultaneously, replacing low-density polyethylene and ethylene-acrylic acid copolymer of the laminated film with high-density polyethylene; the high-density polyethylene with the same melt finger and density as the pipe body 300 is used for replacing the high-density polyethylene of the pipe shoulder 200 and the polypropylene material of the pipe cap 100, and the melt finger and density are consistent with those of the hollow blow-molded high-density polyethylene.
Illustratively, the composition of the composite hose is polyvinyl alcohol and high density polyethylene, wherein the polyvinyl alcohol barrier layer is no greater than 1 μm; taking a common 250 mu pipe body 300, a pipe shoulder 200 and a pipe cap 100 as examples, the proportion of the whole high-density polyethylene accounting for the total weight is over 99.9 percent by weight analysis; therefore, the tube shoulder 200 and the tube cap 100 are made of the same high-density polyethylene as the tube body 300, and are made of single materials, and the low-melting-point high-density polyethylene can be completely recycled and cleaned to be used as a raw material for hollow blow molding, so that the purpose of 100% recycling is achieved, and the existing hose is completely replaced. Therefore, the packaging hose manufactured by the high-barrier recyclable plastic preparation method can realize high barrier performance, and meanwhile, the technical effects of recycling and improving environmental protection efficiency are realized.
In all embodiments of the present application, the terms "large" and "small" are relatively speaking, and the terms "upper" and "lower" are relatively speaking, so that descriptions of these relative terms are not repeated herein.
It should be appreciated that reference throughout this specification to "in this embodiment," "in an embodiment of the present application," or "as an alternative implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in this embodiment," "in the examples of the present application," or "as an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also appreciate that the embodiments described in this specification are all alternative embodiments and that the acts and modules involved are not necessarily required for this application.
In various embodiments of the present application, it should be understood that the size of the serial number of each process described above does not mean that the execution sequence is necessarily sequential, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method of making a high barrier recyclable plastic, wherein the plastic comprises polyvinyl alcohol and a plastic substrate, the method comprising:
coating a polyvinyl alcohol aqueous solution on the plastic substrate by a coater;
drying the plastic base material in the coating process of the coating machine, and forming a polyvinyl alcohol coating on the plastic base material, wherein the content ratio of the polyvinyl alcohol in the plastic is not higher than 5%.
2. The method for preparing high barrier recyclable plastic according to claim 1, wherein the polyvinyl alcohol coating has a thickness of no more than 1 μm.
3. The method for making high barrier recyclable plastic according to claim 1, wherein the plastic substrate comprises a polypropylene film.
4. The method for making a high barrier recyclable plastic according to claim 1, wherein the plastic substrate comprises a polyester film.
5. The method for making a high barrier recyclable plastic according to claim 1, wherein the plastic substrate comprises a polyethylene film.
6. A composite hose comprising a plastic sheet produced by the method of any one of claims 1 to 5.
7. The composite hose of claim 6, comprising a body, the plastic substrate of the body being high density polyethylene, the body comprising an inner layer and an outer layer.
8. The composite hose of claim 7, wherein the outer surface of the tube body has the polyvinyl alcohol coating.
9. The composite hose of claim 7, wherein the polyvinyl alcohol coating is between the inner and outer layers of the tube body.
10. The composite hose of claim 7, further comprising a cap welded to the tube body and a shoulder fastened to or separated from the cap, wherein the cap and the shoulder are made of high density polyethylene, and wherein the cap, the shoulder and the body have the same melt index and density.
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| CN202010792763.XA CN111849011A (en) | 2020-08-07 | 2020-08-07 | Preparation method of high-barrier recyclable plastic and composite hose |
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| CN202010792763.XA CN111849011A (en) | 2020-08-07 | 2020-08-07 | Preparation method of high-barrier recyclable plastic and composite hose |
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Application publication date: 20201030 |
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