CN106827277A - Static mixer and PVC heat shrink films blow molding preparation methods - Google Patents
Static mixer and PVC heat shrink films blow molding preparation methods Download PDFInfo
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- CN106827277A CN106827277A CN201710223287.8A CN201710223287A CN106827277A CN 106827277 A CN106827277 A CN 106827277A CN 201710223287 A CN201710223287 A CN 201710223287A CN 106827277 A CN106827277 A CN 106827277A
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- pvc
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- 230000003068 static effect Effects 0.000 title claims abstract description 51
- 238000000071 blow moulding Methods 0.000 title claims description 15
- 238000002360 preparation method Methods 0.000 title claims description 13
- 229920006300 shrink film Polymers 0.000 title abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 239000010408 film Substances 0.000 claims description 29
- 229920006257 Heat-shrinkable film Polymers 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 21
- 238000010096 film blowing Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 16
- 239000000155 melt Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 13
- 239000000049 pigment Substances 0.000 claims description 11
- 239000000047 product Substances 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 9
- 239000006057 Non-nutritive feed additive Substances 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011265 semifinished product Substances 0.000 claims description 5
- 239000004605 External Lubricant Substances 0.000 claims description 4
- 239000004610 Internal Lubricant Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000004014 plasticizer Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 12
- 238000001465 metallisation Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 43
- 239000004800 polyvinyl chloride Substances 0.000 description 43
- 230000000694 effects Effects 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000010008 shearing Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 239000005022 packaging material Substances 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 5
- 239000002985 plastic film Substances 0.000 description 5
- 238000009472 formulation Methods 0.000 description 4
- 239000008236 heating water Substances 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000003490 calendering Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000012745 toughening agent Substances 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- BJAJDJDODCWPNS-UHFFFAOYSA-N dotp Chemical compound O=C1N2CCOC2=NC2=C1SC=C2 BJAJDJDODCWPNS-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000011104 metalized film Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- -1 spraying Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/04—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with non-movable mixing or kneading devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
- B29B7/286—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control measuring properties of the mixture, e.g. temperature, density
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions 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 a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions 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 a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions 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 a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/06—PVC, i.e. polyvinylchloride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
-
- 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
- C08J2327/00—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 a halogen; Derivatives of such polymers
- C08J2327/02—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 a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/04—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 a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2327/06—Homopolymers or copolymers of vinyl chloride
-
- 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
- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/04—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention provides static mixer, including cylinder, heating element heater, distortion element and retaining element.The present invention also provides the method for preparing PVC heat shrink films using said structure.Static mixer of the present invention, using static mixer special construction, promotes melt mixed, homogenizing, it is to avoid the shear property model of metal powder in mixed process is strengthened.PVC metallization heat shrink films obtained by the inventive method have dispersing uniformity, and metal color is consistent.
Description
Technical Field
The invention belongs to the technical field of polymer material manufacturing, and particularly relates to a static mixer and a blow molding preparation method of a PVC (polyvinyl chloride) heat shrinkable film.
Background
The PVC heat shrinkable film has moderate shrinkage rate and shrinkage force, good transparency, excellent mechanical property and high cost performance, and is widely applied to the packaging of commodities such as daily chemical products, electronic and electric appliances, plastic hardware, glass ceramics and the like. The film packaging material has good protection effect on the packaging materials, makes the appearance of the commodity more vivid and beautiful, improves the packaging grade of the commodity, and is an ideal film packaging material at present. The PVC heat shrink film forming methods can be classified into two broad categories, namely blow molding (secondary inflation) forming and calendering (casting) stretch forming. Blow molding, simple processing equipment, investment saving, flexible replacement of the produced film variety and more suitability for the processing production of the universal shrink packaging material. The calendering (casting) stretching forming mode has fine processing, large width of film products, good thickness uniformity, but more equipment, long flow, large investment and high operating cost. The plastic film is metallized, so that the film has metallic luster, aesthetic feeling, good decorative effect, excellent comprehensive performance, and the performances of air tightness, obstruction, shading, static electricity prevention and the like which are all superior to those of a non-metallized plastic film. The PVC metallized heat shrinkable film integrates the packaging and decoration advantages of two films, further improves the film decoration effect, endows the packaging material with more beautiful and beautiful appearance images, and shows the high-grade quality of the commodity. The metallization of the plastic film is divided into surface metallization and full metallization. The surface metallization can be realized by technical means such as coating, spraying, chemical plating, electroplating, vapor deposition and the like. Because the adhesion between metal and plastic is weak, the metal layer coated and sprayed is easy to fall off, and the metallization performance and effect are affected. Before chemical plating and electroplating, degreasing treatment needs to be carried out on the surface of the film, the treatment temperature is relatively high, generally 70-80 ℃, and most of the shrinkage rate of the PVC heat shrinkage film is lost at the temperature. The surface of the plastic film is evaporated, the metal steam also has high-temperature characteristic, the shrinking efficiency of the shrinking film is lost in the evaporation process, and the satisfactory PVC metallized heat-shrinkable film cannot be obtained. Therefore, the metal powder is added into the formula, and the film product with the contraction function is formed by mixing, melting and plasticizing, so that the method becomes the preferred forming method for preparing the PVC metalized heat shrinkable film. The metallic powder pigment used in the preparation of the metallized plastic film is mostly soft metal, such as most commonly used aluminum powder (silver color) and copper zinc powder (gold color), and is generally micron-sized fine powder, which is easy to generate agglomeration and has poor dispersibility. Meanwhile, the high shearing force in the processing can deform the metal pigment, and the directional arrangement effect of pigment particles is influenced, so that the hue and color difference is generated, and the quality problem of the metallized film is caused. In addition, the metal powder is used in a small amount of 0.5-2.0 parts by mass (100 parts by mass of PVC resin), and the physical properties of the PVC heat shrinkable film are greatly different from other components in a PVC heat shrinkable film formula system, have poor compatibility and are not easy to blend and disperse uniformly. Therefore, in the mixing and processing processes, the shearing damage of the metal powder is reduced, and the good dispersion effect of the metal powder pigment in a PVC system is ensured, so that the method becomes a main problem and a production bottleneck for restricting the processing of the PVC metallized heat shrinkable film. The common PVC thermal shrinkage film blowing unit has two modes of water bath heating as shown in figure 1 and infrared oven heating as shown in figure 2 according to different heating modes of secondary blowing. The water bath heating temperature is more uniform, the film shrinkage rate is more accurately controlled, and the method is a main processing mode of PVC heat-shrinkable printing films, shrinkable sleeve films and high-quality shrinkable packaging films. It is known that even a slight temperature and component nonuniformity of a melt entering a blowing head from an extruder screw can cause the defects of thickness difference, nonuniform coloring, even reduced mechanical properties and the like of a thin film product.
Disclosure of Invention
The invention aims to provide a static mixer, overcome the defects and solve the problems of shear damage of metal powder, poor dispersion effect of metal powder pigment in a PVC system, large thickness difference of film products, uneven coloring, poor mechanical property and the like.
To solve the above technical problems, the present invention provides a static mixer comprising a cylinder, a heating element, a twisting element and a fixing element,
the fixing element comprises a first fixing piece and a second fixing piece, the first fixing piece is arranged at one end of the cylinder and is connected with a machine barrel of the extruder and the cylinder, the second fixing piece is arranged at the other end of the cylinder and is connected with a connecting section of the film blowing machine head and the cylinder, the heating element is sleeved on the outer cylinder wall of the cylinder, and the twisting element is inserted in the cylinder.
As a preferable aspect of the static mixer of the present invention, the torsion member includes a first torsion member and a second torsion member, and the first torsion member and the second torsion member are alternately disposed.
As a preferable aspect of the static mixer of the present invention, an angle between the first torsion element and the second torsion element is 90 degrees.
As a preferable aspect of the static mixer of the present invention, the first torsion element and the second torsion element are each helical, and the helical rotation directions of the first torsion element and the second torsion element are opposite.
In a preferred embodiment of the static mixer of the present invention, the heating element is a band heater wound around the outer wall of the cylinder.
In a preferred embodiment of the static mixer of the present invention, the diameter of the cylinder is the same as the diameter of the barrel of the extruder, and the length of the cylinder is 3 to 5 times the diameter of the screw of the extruder.
The invention also provides a PVC heat shrinkable film blow molding preparation method, which comprises the following steps:
(1) weighing the raw materials according to the formula;
(2) adding the raw materials into a high-speed mixer, mixing, and discharging at 125-130 ℃ to obtain a high-temperature kneaded material;
(3) putting the high-temperature kneaded material into a cooling mixer, and cooling to below 50 ℃ to prepare a dry mixture;
(4) curing and standing the dry mixture for more than 8 hours to obtain a cured mixture;
(5) putting the mixed material into an extruder for melting and plasticizing to obtain a melt;
(6) homogenizing the melt using the static mixer of any one of claims 1 to 6 to produce a homogeneous melt;
(7) the homogeneous melt is blown into a cylindrical thin film, namely a first film bubble, by a film blowing machine head, wherein the temperature of the film blowing machine head is 200-210 ℃, and then the homogeneous melt is cooled by a natural wind ring;
(8) heating for the second time at 75-85 deg.C, blowing to form a second bubble, and cooling to obtain shrinkage rate;
(9) drawing and rolling to obtain a semi-finished product of the cylindrical film roll;
(10) and cutting, inspecting and packaging the semi-finished product to prepare a finished product of the PVC metallized heat shrinkable film.
As a preferable scheme of the PVC heat shrinkable film blow molding preparation method, in the step (1), the formula comprises, by mass, 100 parts of PVC resin, 2.0-2.5 parts of organic tin, 4.0-6.0 parts of plasticizer, 6.0-8.0 parts of toughening agent, 2.5-3.0 parts of plasticizing-promoting processing aid, 0.8-1.2 parts of lubricating processing aid, 1.0-1.3 parts of internal lubricant, 0.8-1.1 parts of external lubricant, 0.5-2.0 parts of metal powder pigment and 0.3-0.5 part of matting powder.
As a preferable scheme of the PVC heat shrinkable film blow molding preparation method of the present invention, in the step (5), the extruder temperature is divided into five stages: the first stage is 160-165 ℃, the second stage is 170-175 ℃, the third stage is 180-185 ℃, the fourth stage is 190-195 ℃ and the fifth stage is 195-200 ℃.
As a preferable scheme of the PVC heat shrinkable film blow molding preparation method, in the step (6), the temperature of the static mixer is 190-200 ℃.
Compared with the prior art, the static mixer provided by the invention utilizes different principles of mixing action and mechanical stirring of the static mixer, and utilizes the special structure of the static mixer to promote melt mixing and homogenization and avoid shearing damage of metal powder in the process of intensified mixing. Compared with the common PVC heat shrinkable film, the PVC heat shrinkable film prepared by the PVC heat shrinkable film blow molding preparation method provided by the invention has the advantages that on the basis of keeping good stability, processability and mechanical rigidity and flexibility balance, a certain amount of lubricating processing aid is added, the total amount of the processing aid is increased, the proportion of a lubricant is increased, the flow properties of dry mixed materials and a melt are improved, the shearing and friction of equipment to the materials are reduced, the dispersion uniformity of metal powder in a PVC formula system is improved, and the consistency of the metal color of the PVC heat shrinkable film is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein,
FIG. 1 is a schematic view showing a process of heating a PVC heat shrinkable film by a secondary water bath in the prior art;
FIG. 2 is a schematic view showing a process of producing a PVC heat shrinkable film by a far infrared secondary heating film blowing method in the prior art;
FIG. 3 is a schematic structural diagram of a static mixer of the present invention.
Wherein: 1 is a hopper, 2 is an extruder, 3 is a film blowing head, 4 is a cooling air ring, 5 is a first film bubble, 6 is a first herringbone plate, 7 is a first drawing roller, 8 is a first guide roller, 9 is a second drawing roller, 10 is a far infrared heating device, 11 is an auxiliary heating device, 12 is an upper cooling air ring, 13 is a lower cooling air ring, 14 is a foam stabilizing device, 15 is a second herringbone plate, 16 is a third drawing roller, 17 is a heat setting roller, 18 is a cooling device, 19 is a second guide roller, 20 is a film roll, 21 is a curling device, 22 is a second film bubble, 23 is a sizing cooling jacket, 24 is a heating water tank, 25 is a cylinder, 26 is a fixing member, 27 is a twisting member, 271 is a first twisting member, 272 is a second twisting member, 281 is a first fixing member, 282 is a second fixing member, and 29 is a thermocouple hole.
Detailed Description
The static mixer of the present invention comprises: a cylinder 25, a heating element 26, a twisting element 27 and a fixing element (not shown).
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
First, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Next, the present invention is described in detail by using schematic structural diagrams, etc., and for convenience of illustration, the schematic diagrams showing the structure of the static mixer are not partially enlarged in general scale when describing the embodiments of the present invention, and the schematic diagrams are only examples, which should not limit the scope of the present invention. In addition, the actual fabrication process should include three-dimensional space of length, width and depth.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a static mixer of the present invention. As shown in figure 3, a static mixer which has the same diameter as the extruder barrel and is 3-5D (the diameter of an extruder screw) in length is additionally arranged between the extruder and a film blowing head of a common PVC thermal shrinkage film blowing unit, the static mixer comprises a cylinder 25, a heating element 26, a twisting element 27 and a fixing element, the fixing element comprises a first fixing piece 281 and a second fixing piece 282, the first fixing piece 281 and the second fixing piece 282 are respectively arranged at two ends of the cylinder 25, the first fixing piece 281 is connected with the extruder barrel and the cylinder, the second fixing piece 282 is connected with a connecting section of the film blowing head and the cylinder 25, namely the static mixer is connected with the head of the screw in a combined mode, the static mixer is connected with the cylinder after being assembled, and the other end of the static mixer is connected with the connecting section of the film blowing head through a flange. The heating element 26 is sleeved on the outer cylinder wall of the cylinder 25, and the twisting element is inserted in the cylinder 25. The static mixer is not a screw main body, and is a set of fixed elements arranged between a machine head and a screw. The static mixer used in the present invention is a cylinder in which a series of twisting elements, i.e. a first twisting element 271 and a second twisting element 272, are mounted in series and in contact with each other, the fixing elements are oppositely staggered in different directions and are 90 ° to each other, the first twisting element 271 and the second twisting element 272 are both helical, and the helical rotation directions of the first twisting element 271 and the second twisting element 272 are opposite. The heating element 26 is a band heater that is wound around the outer cylindrical wall of the cylinder 25. Between the strip heaters, a thermocouple hole 29 is also provided in the outer cylindrical wall of the cylinder 25. The static mixer does not rely on the movement of a mechanical moving part to give energy to melt (fluid) to promote mixing, but in the melt conveying process, the melt is divided into a plurality of material flows through the twisting element, so that the material flows along a flow channel formed by the twisting element, meanwhile, the material flows also make rotary flow relative to a spiral curve of the twisting element, the turning of the melt causes radial mixing, and the melt mixing and homogenizing effect is improved. The melt is mixed in the static mixer by means of the flow energy of the melt, so that the shearing action is relatively low, and the metal pigment powder cannot be further sheared and damaged. Therefore, the invention utilizes the different principles of the mixing action and the mechanical stirring of the static mixer, and utilizes the special structure of the static mixer to promote the mixing and homogenization of the melt and avoid the shearing damage of the metal powder in the process of strengthening the mixing.
The following describes a method for preparing PVC heat shrinkable film by blow molding, which needs to use the static mixer:
1. weighing PVC resin, metal powder pigment and other auxiliary agents according to a formula;
2. adding a high-speed mixer for kneading (mixing), wherein the discharging temperature is 125-130 ℃;
3. cooling the mixture to below 50 ℃ by a cooling mixer to prepare a dry mixture;
4. curing (standing) the dry mixture for more than 8 hours;
5. extruder melt plastification, extruder temperature: 160-165 ℃, 170-175 ℃, 180-185 ℃, 190-195-200 ℃;
6. homogenizing a melt of a static mixer, wherein the length of the static mixer is 3-5D, and the temperature is 190-200 ℃;
7. blowing the film blowing machine head into a cylindrical film (bubble), wherein the temperature of the machine head is 200-210 ℃, and cooling by a natural wind ring;
8. heating for the second time (75-85 deg.C), blowing to form second bubble, cooling, and shaping to obtain shrinkage;
9. drawing and rolling to obtain a cylindrical film roll (semi-finished product);
10. and cutting, inspecting and packaging to obtain the PVC metallized heat shrinkable film finished product.
In order to achieve the purpose, besides selecting metal powder pigment with proper particle size and surface treatment, the dosage of internal and external lubricants is properly increased during formulation design, so that the internal and external friction forces of materials in mixing and processing are reduced; the processing aid adopts a combination form of plasticizing promoting type and lubricating type ACR, and greatly improves the total dosage, so that the lubricity and the fluidity of a PVC formula system melt are improved, the dispersion effect of metal powder in the melt is improved, and the mechanical shearing force in melt plasticizing conveying is reduced, thereby achieving the formula design purpose of reducing the shearing damage of the metal powder and ensuring the good dispersion effect of metal powder pigment in a PVC system.
In addition, in order to eliminate the color difference of the metal powder as much as possible, a certain proportion of matting powder is added in the formula to be matched with the metal powder, and the using amount is 0.3-0.5 parts by mass.
The specific formula proportion of the PVC metallized heat shrinkable film and the comparison condition with the formula of the common PVC heat shrinkable film are shown in the following table 1.
TABLE 1 comparison of metallized and non-metallized PVC heat shrink film formulations
The following describes specific examples of products made with the above apparatus and formulation:
example 1:
the product is as follows:
silver PVC heat shrink film, film folding diameter 780mm, thickness 0.07mm, shrinkage: 48-50% in the transverse direction and 0-3% in the longitudinal direction.
Formulation of
Equipment:
an extruder: phi 65 single screw extruder, L/D29: 1, screw is a barrier type structure with mixing head.
A static mixer: the length is 260 mm;
a film blowing machine head: die diameter Φ 130;
secondary blowing: heating in water bath
The process comprises the following steps:
kneading (high-speed mixing) discharge temperature: 130 ℃;
cooling mixed discharge temperature: 50 deg.C
The dry blend was allowed to stand for 8 hours.
Plasticizing and extruding by an extruder:
| extruding machine | 1 | 2 | 3 | 4 | 5 |
| Temperature, C | 163 | 172 | 185 | 190 | 198 |
Rotating speed of the extruder: 45rpm
A static mixer:
temperature: 190 deg.C
A film blowing machine head:
temperature of the connection section: 190 ℃ and 195 ℃;
head temperature: 200 ℃ and 202 ℃;
secondary heating water tank
Water bath temperature: 78 deg.C
Water temperature of the sizing sleeve: 16 deg.C
Example 2:
the product is as follows:
silver PVC heat shrink film, film book footpath 920mm, thickness 0.075mm, the shrinkage factor: 45-48% in the transverse direction and 10-15% in the longitudinal direction.
The formula is as follows:
equipment:
an extruder: phi 70 single screw extruder, L/D29: 1, screw is barrier type structure with mixing head.
A static mixer: the length is 210 mm;
a film blowing machine head: die diameter Φ 150;
secondary blowing: infrared oven heating
The process comprises the following steps:
kneading (high-speed mixing) discharge temperature: 130 ℃;
cooling mixed discharge temperature: 48 deg.C
Standing the dry mixture for 8 hours
Plasticizing and extruding by an extruder:
| extruding machine | 1 | 2 | 3 | 4 | 5 |
| Temperature, C | 165 | 175 | 187 | 193 | 200 |
Rotating speed of the extruder: 48rpm
A static mixer:
temperature: 198 deg.C
A film blowing machine head:
temperature of the connection section: 195 ℃ and 199 ℃;
head temperature: 200 ℃ and 205 ℃;
secondary heating water tank
Oven temperature: 83 deg.C
Cooling air circulation temperature: 23 deg.C
Example 3
The golden PVC heat shrinkable film has a film folding diameter of 550mm, a thickness of 0.07mm, and a shrinkage rate: transverse direction
45-48% and 0-5% in the longitudinal direction.
The formula is as follows:
| name of raw and auxiliary materials | Number plate | Proportioning (parts by mass) |
| PVC resin | SG-5 | 100 |
| Organotin compounds | 728 | 2.1 |
| Plasticizer | DOTP | 4.0 |
| Toughening agent MBS | B-522 | 8.0 |
| Plasticizing-promoting type processing aid ACR | K-120N | 3.0 |
| Lubricating ACR | K-175P | 1.2 |
| Internal lubricant | RGH-4 | 1.2 |
| External lubricant | AC-629A | 0.8 |
| Gold powder | ResistCT | 0.5 |
| Matting powder | TS-100 | 0.3 |
Equipment:
an extruder: phi 55 single screw extruder, L/D is 26.5:1, screw is barrier type structure with mixing head.
A static mixer: the length is 275 mm;
a film blowing machine head: die diameter Φ 110;
secondary blowing: heating in water bath
The process comprises the following steps:
kneading (high-speed mixing) discharge temperature: 130 ℃;
cooling mixed discharge temperature: 50 deg.C
Standing the dry mixture for 8 hours
Plasticizing and extruding by an extruder:
rotating speed of the extruder: 42rpm
A static mixer:
temperature: 195 deg.C
A film blowing machine head:
temperature of the connection section: 195 ℃ and 200 ℃;
head temperature: 200 ℃ and 205 ℃;
secondary heating water tank
Water bath temperature: 80 deg.C
Water temperature of the sizing sleeve: 15 deg.C
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. Static mixer, characterized by: comprises a cylinder, a heating element, a twisting element and a fixing element,
the fixing element comprises a first fixing piece and a second fixing piece, the first fixing piece is arranged at one end of the cylinder and is connected with a machine barrel of the extruder and the cylinder, the second fixing piece is arranged at the other end of the cylinder and is connected with a connecting section of the film blowing machine head and the cylinder, the heating element is sleeved on the outer cylinder wall of the cylinder, and the twisting element is inserted in the cylinder.
2. The static mixer of claim 1, wherein: the torsion elements include first torsion elements and second torsion elements, which are alternately arranged.
3. The static mixer of claim 2, wherein: the included angle between the first torsion element and the second torsion element is 90 degrees.
4. The static mixer of claim 2, wherein: the first torsion element and the second torsion element are both helical, and the helical rotation directions of the first torsion element and the second torsion element are opposite.
5. The static mixer of claim 1, wherein: the heating element is a band heater wound on the outer cylinder wall of the cylinder.
6. The static mixer of claim 1, wherein: the diameter of the cylinder is the same as that of a machine barrel of the extruder, and the length of the cylinder is 3-5 times of the diameter of a screw of the extruder.
7, a PVC thermal contraction film blow molding preparation method, which is characterized in that:
(1) weighing the raw materials according to the formula;
(2) adding the raw materials into a high-speed mixer, mixing, and discharging at 125-130 ℃ to obtain a high-temperature kneaded material;
(3) putting the high-temperature kneaded material into a cooling mixer, and cooling to below 50 ℃ to prepare a dry mixture;
(4) curing and standing the dry mixture for more than 8 hours to obtain a cured mixture;
(5) putting the mixed material into an extruder for melting and plasticizing to obtain a melt;
(6) homogenizing the melt using the static mixer of any one of claims 1 to 6 to produce a homogeneous melt;
(7) the homogeneous melt is blown into a cylindrical thin film, namely a first film bubble, by a film blowing machine head, wherein the temperature of the film blowing machine head is 200-210 ℃, and then the homogeneous melt is cooled by a natural wind ring;
(8) heating for the second time at 75-85 deg.C, blowing to form a second bubble, and cooling to obtain shrinkage rate;
(9) drawing and rolling to obtain a semi-finished product of the cylindrical film roll;
(10) and cutting, inspecting and packaging the semi-finished product to prepare a finished product of the PVC metallized heat shrinkable film.
8. The PVC heat shrinkable film blow molding preparation method of claim 7, which is characterized in that: in the step (1), the formula comprises, by mass, 100 parts of PVC resin, 2.0-2.5 parts of organic tin, 4.0-6.0 parts of plasticizer, 6.0-8.0 parts of flexibilizer, 2.5-3.0 parts of plasticizing-promoting processing aid, 0.8-1.2 parts of lubricating-type processing aid, 1.0-1.3 parts of internal lubricant, 0.8-1.1 parts of external lubricant, 0.5-2.0 parts of metal powder pigment and 0.3-0.5 part of matting powder.
9. The PVC heat shrinkable film blow molding preparation method of claim 7, which is characterized in that: in the step (5), the temperature of the extruder is divided into five stages: the first stage is 160-165 ℃, the second stage is 170-175 ℃, the third stage is 180-185 ℃, the fourth stage is 190-195 ℃ and the fifth stage is 195-200 ℃.
10. The PVC heat shrinkable film blow molding preparation method of claim 7, which is characterized in that: in the step (6), the temperature of the static mixer is 190-200 ℃.
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| CN111331873A (en) * | 2020-05-21 | 2020-06-26 | 潍坊润宜科新材料有限公司 | Intelligent smart belt blank production line |
| CN111730846A (en) * | 2020-06-04 | 2020-10-02 | 广东金明精机股份有限公司 | Film bubble cooling structure and film bubble cooling method of down-blowing type film blowing machine |
| CN113001806A (en) * | 2019-12-19 | 2021-06-22 | 霹幕能源科技(上海)有限公司 | System and method for preparing crosslinkable polyethylene compound |
| CN114434769A (en) * | 2022-02-14 | 2022-05-06 | 深圳市金海洋实业发展有限公司 | PVC heat shrinkage film preparation system and method |
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Application publication date: 20170613 |