CN111805950A - Manufacturing process of metallocene linear low-density polyethylene reinforced winding film - Google Patents
Manufacturing process of metallocene linear low-density polyethylene reinforced winding film Download PDFInfo
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- CN111805950A CN111805950A CN202010662859.4A CN202010662859A CN111805950A CN 111805950 A CN111805950 A CN 111805950A CN 202010662859 A CN202010662859 A CN 202010662859A CN 111805950 A CN111805950 A CN 111805950A
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- 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
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
-
- 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
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/0625—LLDPE, i.e. linear low density polyethylene
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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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
-
- 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
- B32B2307/582—Tearability
- B32B2307/5825—Tear resistant
-
- 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
- C08J2323/08—Copolymers of ethene
-
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
Abstract
The invention relates to the technical field of winding films and discloses a manufacturing process of a metallocene linear low-density polyethylene reinforced winding film, wherein mLLDPE-a and mLLDPE-b in a winding film structure are respectively metallocene linear low-density polyethylene with two different melt fingers and are used for improving the strength and adjusting the melt fingers of a blending material according to different equipment characteristics; mLLDPE-C is metallocene linear low density polyethylene with high viscosity grade, used for improving the viscosity of finished product film, the polyethylene is a thermoplastic resin prepared by polymerizing ethylene, in industry, also includes the copolymer of ethylene and a small amount of alpha-olefin, the polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the lowest using temperature can reach-100 to-70 ℃), has good chemical stability, can resist most of acid and alkali erosion (can not resist acid with oxidation property), is insoluble in common solvent at normal temperature, has small water absorption and excellent electrical insulation, the layer A is mLLDPE-a + mLLDPE-B + LLDPE, the layer B is mLLDPE-a + mLLDPE-B + LLDPE, the layer C is mLLDPE-a + mLLDPE-B + LLDPE, the layer D is mLLDPE-a + mLLDPE-B + LLDPE, and the layer E is mLLDPE-C.
Description
Technical Field
The invention relates to the technical field of winding films, in particular to a manufacturing process of a metallocene linear low-density polyethylene reinforced winding film.
Background
The winding film is also called as a stretching film, has excellent tensile property, puncture resistance and tearing resistance, and is widely applied to packing and bundling applications of chemical products, electronic product boxes, ceramic products, electromechanical equipment and the like. The winding film can be widely used for packaging of building materials such as foreign trade exports, pop cans, food and beverage, printing and papermaking, refractory materials, wood floors, cosmetics, artware, non-woven fabrics, carpets, ceramic electromechanical products, computers, communication products, books and periodicals, electronic components, household appliances, chemical raw and auxiliary materials, ceramic tiles and the like, and products such as steel, section bars, wire rods, aluminum alloy section bars and the like. Domestic winding films are generally single-layer or three-layer.
The winding film in the prior art usually adopts a three-layer co-extrusion molding mode, the general specification is about 15 mu m, and a five-layer co-extrusion novel structure is adopted, so that the thickness of a product can be reduced to about 12 mu m, and more excellent high retention property, tensile resistance, puncture resistance and tear resistance can be maintained on the basis. In a three-layer structure, the balance of the properties of the product can be achieved only by adopting a material mixing mode, but the material mixing results in that the raw materials can not exert all the properties. To this end, we propose a process for producing a metallocene linear low density polyethylene reinforced winding film.
Disclosure of Invention
Technical problem to be solved
The invention mainly solves the technical problems in the prior art and provides a manufacturing process of a metallocene linear low-density polyethylene reinforced winding film.
(II) technical scheme
In order to achieve the above purpose, the invention adopts the following technical scheme that the manufacturing process of the metallocene linear low-density polyethylene reinforced winding film comprises the following steps:
1) drying, proportioning and mixing the raw materials, and feeding the raw materials through a vacuum hopper;
2) extruding the material by equipment, and filtering the semi-finished product at the extruded part by a filter screen;
3) treating the filtered product through a die head, and carrying out tape casting cooling on the semi-finished product;
4) then, sequentially carrying out thickness gauge corona treatment, swing amplitude and all-edge traction on the finished product;
5) flattening the finished product to remove static electricity;
6) and finally, rolling the finished product.
mLLDPE-a and mLLDPE-b in the winding film structure are respectively metallocene linear low density polyethylene with two different melt fingers, and are used for improving the strength and adjusting the melt fingers of the blending material according to different equipment characteristics; mLLDPE-c is a metallocene linear low density polyethylene high grade for tack, used to improve the finished film tack.
The polyethylene is thermoplastic resin prepared by polymerizing ethylene, and also comprises a copolymer of ethylene and a small amount of alpha-olefin in industry, and 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, can resist corrosion of most of acid and alkali (cannot resist acid with oxidation property), is insoluble in common solvents at normal temperature, and has small water absorption and excellent electrical insulation.
Preferably, the thickness gauge is used for measuring the thickness of the material or the thickness of a covering layer on the surface of the material, the uniformity of each point and the corrosion and abrasion degree of the material, and sometimes the thickness of the covering layer on the surface of the material is measured to ensure the quality of products and the production safety.
Preferably, the corona treatment is an electric shock treatment, which provides higher adhesion to the surface of the printing material, most plastic films (such as hydrocarbon films) are nonpolar polymers, and known inks and adhesives with low surface tension cannot be firmly adhered to the plastic films, so that the surface of the plastic films is subjected to a corona treatment, chemical bonds of the plastic molecules are broken to degrade the plastic films, the surface roughness and the surface area are increased, a large amount of ozone is generated during discharge, the ozone is a strong oxidant, the plastic molecules are oxidized, and groups with stronger polarity such as carbonyl groups and peroxides are generated, so that the surface energy of the plastic films is improved.
Preferably, the typical layers of the winding film comprise an outer layer A, an intermediate layer B, an intermediate layer C, an intermediate layer D and an E-bonding layer.
Preferably, the layer A is mLLDPE-a + mLLDPE-B + LLDPE, the layer B is mLLDPE-a + mLLDPE-B + LLDPE, the layer C is mLLDPE-a + mLLDPE-B + LLDPE, the layer D is mLLDPE-a + mLLDPE-B + LLDPE, and the layer E is mLLDPE-C.
Advantageous effects
The invention provides a manufacturing process of a metallocene linear low-density polyethylene reinforced winding film. The method has the following beneficial effects:
(1) the manufacturing process of the metallocene linear low-density polyethylene reinforced winding film can obviously reduce the thickness of the winding film, and the thickness of 3 layers of the winding film is 15 microns and is reduced to 12 microns.
(2) The manufacturing process of the metallocene linear low-density polyethylene reinforced winding film improves the puncture resistance of the winding film and improves the tensile strength.
(3) The manufacturing process of the metallocene linear low-density polyethylene reinforced winding film has the advantages that the metallocene strength and the puncture resistance are high, the thickness of the winding film is reduced, the cost is reduced, the metallocene viscosity is high, the cohesiveness of the winding film is improved, the metallocene high strength is used for improving the strength of the winding film, and the appearance of the finished winding film (few crystal points) can be improved.
(4) The manufacturing process of the metallocene linear low-density polyethylene reinforced winding film comprises a layer A of mLLDPE-a + mLLDPE-B + LLDPE, a layer B of mLLDPE-a + mLLDPE-B + LLDPE, a layer C of mLLDPE-a + mLLDPE-B + LLDPE, a layer D of mLLDPE-a + mLLDPE-B + LLDPE and a layer E of mLLDPE-C, wherein mLLDPE-a and mLLDPE-B in the typical structure are two kinds of metallocene linear low-density polyethylene with different melt fingers respectively and are used for improving the strength and adjusting the melt fingers of a blending material according to different equipment characteristics; mLLDPE-c is a metallocene linear low density polyethylene high grade for tack, used to improve the finished film tack.
(5) The manufacturing process of the metallocene linear low-density polyethylene reinforced winding film can reduce the thickness of a product to about 12 mu m, and can keep more excellent high retention property, tensile resistance, puncture resistance and tear resistance on the basis. The mode that can only adopt the compounding can reach the performance balance of product in three layer construction, but the result of compounding is that raw and other materials can not exert whole performance, and five layer structure substitute three layer construction for the winding membrane can exert the performance of every raw and other materials, further improves the comprehensive properties of product.
Drawings
FIG. 1 is a schematic view of an exemplary interlayer structure of the present invention;
FIG. 2 is a schematic diagram of the production of a wrapping film according to the present invention.
Illustration of the drawings:
1, extruding; 2, feeding; 3, filtering a screen; 4 a melt pipe; 5, a die head; 6, casting and cooling; 7, a film thickness gauge; 8, performing corona treatment; 9 swing amplitude; 10\29309primertrimming; and 11, rolling.
The specific implementation mode is as follows:
the technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
The manufacturing process of the metallocene linear low-density polyethylene reinforced winding film comprises the following steps:
1) drying, proportioning and mixing the raw materials, and feeding the raw materials through a vacuum hopper;
2) extruding the material by equipment, and filtering the semi-finished product at the extruded part by a filter screen;
3) treating the filtered product through a die head, and carrying out tape casting cooling on the semi-finished product;
4) then, sequentially carrying out thickness gauge corona treatment, swing amplitude and all-edge traction on the finished product;
5) flattening the finished product to remove static electricity;
6) and finally, rolling the finished product.
mLLDPE-a and mLLDPE-b in the winding film structure are respectively metallocene linear low density polyethylene with two different melt fingers, and are used for improving the strength and adjusting the melt fingers of the blending material according to different equipment characteristics; mLLDPE-c is a metallocene linear low density polyethylene high grade for tack, used to improve the finished film tack.
The polyethylene is thermoplastic resin prepared by polymerizing ethylene, and also comprises a copolymer of ethylene and a small amount of alpha-olefin in industry, and 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, can resist corrosion of most of acid and alkali (cannot resist acid with oxidation property), is insoluble in common solvents at normal temperature, and has small water absorption and excellent electrical insulation.
The thickness gauge is used for measuring the thickness of a material or the thickness of a covering layer on the surface of the material, the uniformity of each point and the corrosion and abrasion degree of the material, and sometimes the thickness of the covering layer on the surface of the material is measured to ensure the quality and the production safety of products.
The corona treatment is an electric shock treatment, which enables the surface of a printing stock to have higher adhesiveness, most plastic films (such as hydrocarbon polymer films) belong to nonpolar polymers, known ink and adhesive with lower surface tension cannot be firmly adhered on the surfaces, so the surfaces of the plastic films are subjected to corona treatment, chemical bonds of plastic molecules are broken and degraded, the surface roughness and the surface area are increased, a large amount of ozone is also generated during discharge, the ozone is a strong oxidant, the plastic molecules can be oxidized, and groups with stronger polarity, such as carbonyl and peroxide, are generated, so the surface energy of the plastic films is improved.
The typical layers of the winding film comprise an outer layer A, an intermediate layer B, an intermediate layer C, an intermediate layer D and an E-bonding layer.
The layer A is mLLDPE-a + mLLDPE-B + LLDPE, the layer B is mLLDPE-a + mLLDPE-B + LLDPE, the layer C is mLLDPE-a + mLLDPE-B + LLDPE, the layer D is mLLDPE-a + mLLDPE-B + LLDPE, and the layer E is mLLDPE-C.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The manufacturing process of the metallocene linear low-density polyethylene reinforced winding film is characterized by comprising the following steps of:
1) drying, proportioning and mixing the raw materials, and feeding the raw materials through a vacuum hopper;
2) extruding the material by equipment, and filtering the semi-finished product at the extruded part by a filter screen;
3) treating the filtered product through a die head, and carrying out tape casting cooling on the semi-finished product;
4) then, sequentially carrying out thickness gauge corona treatment, swing amplitude and all-edge traction on the finished product;
5) flattening the finished product to remove static electricity;
6) and finally, rolling the finished product.
2. The process for manufacturing the winding film reinforced by metallocene linear low density polyethylene according to claim 1, wherein: mLLDPE-a and mLLDPE-b in the winding film structure are respectively metallocene linear low density polyethylene with two different melt fingers, and are used for improving the strength and adjusting the melt fingers of the blending material according to different equipment characteristics; mLLDPE-c is a metallocene linear low density polyethylene high grade for tack, used to improve the finished film tack.
3. The process for manufacturing the winding film reinforced by metallocene linear low density polyethylene according to claim 1, wherein: the polyethylene is thermoplastic resin prepared by polymerizing ethylene, and also comprises a copolymer of ethylene and a small amount of alpha-olefin in industry, and 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, can resist corrosion of most of acid and alkali (cannot resist acid with oxidation property), is insoluble in common solvents at normal temperature, and has small water absorption and excellent electrical insulation.
4. The process for manufacturing the winding film reinforced by metallocene linear low density polyethylene according to claim 1, wherein: the thickness gauge is used for measuring the thickness of a material or the thickness of a covering layer on the surface of the material, the uniformity of each point and the corrosion and abrasion degree of the material, and sometimes the thickness of the covering layer on the surface of the material is measured to ensure the quality and the production safety of products.
5. The process for manufacturing the winding film reinforced by metallocene linear low density polyethylene according to claim 1, wherein: the corona treatment is an electric shock treatment, which enables the surface of a printing stock to have higher adhesiveness, most plastic films (such as hydrocarbon polymer films) belong to nonpolar polymers, known ink and adhesive with lower surface tension cannot be firmly adhered on the surfaces, so the surfaces of the plastic films are subjected to corona treatment, chemical bonds of plastic molecules are broken and degraded, the surface roughness and the surface area are increased, a large amount of ozone is also generated during discharge, the ozone is a strong oxidant, the plastic molecules can be oxidized, and groups with stronger polarity, such as carbonyl and peroxide, are generated, so the surface energy of the plastic films is improved.
6. The process for manufacturing the winding film reinforced by metallocene linear low density polyethylene according to claim 1, wherein: the typical layers of the winding film comprise an outer layer A, an intermediate layer B, an intermediate layer C, an intermediate layer D and an E-bonding layer.
7. The process for manufacturing the winding film reinforced by metallocene linear low density polyethylene according to claim 6, wherein: the layer A is mLLDPE-a + mLLDPE-B + LLDPE, the layer B is mLLDPE-a + mLLDPE-B + LLDPE, the layer C is mLLDPE-a + mLLDPE-B + LLDPE, the layer D is mLLDPE-a + mLLDPE-B + LLDPE, and the layer E is mLLDPE-C.
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| CN202010662859.4A CN111805950A (en) | 2020-07-10 | 2020-07-10 | Manufacturing process of metallocene linear low-density polyethylene reinforced winding film |
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| CN112959778A (en) * | 2021-04-08 | 2021-06-15 | 珠海市德燊环保包装有限公司 | Heavy packaging film, preparation method and heavy packaging bag |
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| CN112549578A (en) * | 2020-12-29 | 2021-03-26 | 苏州双雄新材料股份有限公司 | Preparation process of winding film for industrial packaging |
| CN112959778A (en) * | 2021-04-08 | 2021-06-15 | 珠海市德燊环保包装有限公司 | Heavy packaging film, preparation method and heavy packaging bag |
| CN116178829A (en) * | 2022-12-28 | 2023-05-30 | 上海云开塑胶制品有限公司 | Unidirectional polyethylene shrink film with stable shrinkage rate and preparation method thereof |
| CN116178829B (en) * | 2022-12-28 | 2024-04-30 | 上海云开塑胶制品有限公司 | Unidirectional polyethylene shrink film with stable shrinkage rate and preparation method thereof |
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