Classifications

• • 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
  • 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
  • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
  • B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates 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
  • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
  • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
  • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
  • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
• • 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
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
• • 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
  • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
• • 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
  • B29K2023/10—Polymers of propylene
• • 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
  • B29K2031/00—Use of polyvinylesters or derivatives thereof as moulding material
  • B29K2031/04—Polymers of vinyl acetate, e.g. PVAc, i.e. polyvinyl acetate
• • 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
  • B32B2307/514—Oriented
  • B32B2307/518—Oriented bi-axially
• • 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
  • B32B2323/00—Polyalkenes
  • B32B2323/10—Polypropylene

Definitions

• the invention relates to a glueless biaxially oriented polypropylene film for paper-plastic composite and a preparation method thereof. Background technique
• Print film is an important means of post-press processing, which determines the final value of the printed product.
• the film coating process of the printed matter refers to covering the paper printed matter with a plastic film, and using an adhesive in the middle, after heat and pressure treatment, the two different properties of the plastic film and the paper are bonded together to form a paper/plastic combination.
• a surface decoration processing technology It protects and decorates prints and is widely used in the field of packaging and printing, such as book covers, brochures, maps, advertising gift bags, and advanced packaging boxes.
• Current coating technology can be broadly divided into instant coating and pre-coated.
• the film coating technology is the post-printing process for printed matter and packaging products that emerged in the 1960s.
• this technology directly uses benzene-containing solvents in the laminating process, causing air pollution and causing great harm to the body of producers and users; it is easy to form bubbles between the film and the paper during film coating, so that the printed matter The surface is foggy, affecting the print's finish, clarity and color.
• the pre-coating film coating technology can be said to be environmentally friendly technology or clean technology to achieve environmental protection, health protection and safe production.
• pre-coated film has high production cost and strong dependence on equipment. For current domestic users, the high cost is still not acceptable to the public. Summary of the invention
• the present invention is directed to solving at least some of the above technical problems or at least providing a useful commercial choice. Accordingly, it is an object of the present invention to provide a non-adhesive biaxially oriented polypropylene film for paper-plastic composite which has good bonding properties.
• Another object of the present invention is to provide a process for preparing the non-gel biaxially oriented polypropylene film for paper-plastic composite.
• a non-adhesive biaxially oriented polypropylene film for paper-plastic composite comprising an upper surface layer, an upper layer, a core layer, a lower layer and a functional layer which are sequentially disposed from top to bottom, wherein the functional layer is an anti-blocking agent
• the ethylene-vinyl acetate copolymer has a content of the ethylene-vinyl acetate copolymer of from 90% to 97% based on the total weight of the functional layer.
• the non-adhesive biaxially oriented polypropylene film for paper-plastic composite can be directly combined with a paper print, a package or a paper-plastic composite through a functional layer under heating and pressurization conditions. , the realization of the paper-plastic composite without gel. This not only eliminates the complicated glue coating process, but also has the environmental protection characteristics of the pre-coating film without pollution, and has high composite strength with the printing materials such as paper, stable quality, low price and high cost performance.
• the rubber-free biaxially oriented polypropylene film for paper-plastic composite may further have the following additional technical features:
• the ethylene-vinyl acetate copolymer has a vinyl acetate monomer content of 10% to 20% and a melt index of 2 to 10 g/g based on the total weight of the ethylene-vinyl acetate copolymer.
• the lower layer is a metallocene linear low density polyethylene containing at least one selected from the group consisting of an antistatic agent, a slip agent, and a reinforcing agent.
• the metallocene linear low density polyethylene is present in an amount of from 95% to 98% based on the total weight of the lower layer.
• the upper surface layer is a matt polypropylene or an isotactic polypropylene containing an anti-blocking agent, a slip agent.
• the content of the matt polypropylene or isotactic polypropylene is from 95% to 98% based on the total weight of the upper surface layer.
• the upper layer and the core layer each contain 60%-100% of isotactic polypropylene.
• the upper layer and the core layer are both made of content greater than 60% and less than 100% isotactic polypropylene is a mixture of at least one selected from the group consisting of an antistatic agent, a slip agent, and a reinforcing agent.
• the paper-plastic composite rubber-free biaxially oriented polypropylene film has a total thickness of 17 ⁇ m - 21 ⁇ m, the functional layer has a thickness of 2.5 ⁇ m - 4.5 ⁇ m, and the upper surface layer has a thickness of 2.5 ⁇ -3.5 ⁇ .
• the melt is filtered through a filter through a pipe, distributed to a die, and then cast into a thick sheet; 3) the slab is formed by transverse stretching and longitudinal stretching of the stretching device.
• the film is subjected to corona treatment or flame treatment to form a mother roll, and the mother roll is subjected to aging treatment and slitting to form a finished product of the paper-plastic composite non-adhesive biaxially oriented polypropylene film.
• the temperature of the extrusion apparatus and the die is controlled at 225 ° C - 265 ° C, and the casting slab temperature is controlled at 18 ° C - 50 ° C, the longitudinal direction
• the stretching temperature is controlled at 80 ° C to 140 ° C and the longitudinal stretching ratio is 4.8-6;
• the transverse stretching temperature is controlled at 150 ° C to 170 ° C and the transverse stretching ratio is 8 -9.5, surface treatment strength is 32-43 mN/m.
• the method for preparing a rubber-free biaxially oriented polypropylene film for paper-plastic composite according to an embodiment of the present invention is not only simple to operate, environmentally friendly, and reduces manufacturing costs.
• FIG. 1 is a schematic view showing the structure of a rubber-free biaxially oriented polypropylene film for paper-plastic composite according to an embodiment of the present invention
• FIG. 2 is a schematic view showing a method for preparing a rubber-free biaxially oriented polypropylene film for paper-plastic composite according to an embodiment of the present invention
• first and second are used for descriptive purposes only, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defining “first” and “second” may explicitly or implicitly include one or more of the features. Further, in the description of the present invention, “multiple” means two or more unless otherwise stated.
• BOPP biaxially oriented polypropylene film
• the rubber-free biaxially oriented polypropylene film for paper-plastic composite comprises an upper surface layer 4, an upper layer 2, a core layer 1, a lower layer 3, and a functional layer 5 which are disposed in this order from top to bottom.
• the upper surface layer 4 is a matt polypropylene or an isotactic polypropylene containing an anti-blocking agent and a slip agent, wherein the content of the matt polypropylene or the isotactic polypropylene is 95%-98. %.
• Anti-blocking agents and slip agents can be used in the field of anti-blocking agents and slip agents.
• the upper layer may contain 60% to 100% of isotactic polypropylene based on the total weight of the upper layer 2.
• the upper layer 2 may further contain isotactic polypropylene and at least one selected from the group consisting of an antistatic agent, a slip agent, and a reinforcing agent, wherein, based on the total weight of the upper layer 2, isotactic polymerization
• the content of propylene is more than 60% and less than 100%, and the balance is at least one selected from the group consisting of an antistatic agent, a slip agent, and a reinforcing agent.
• the antistatic agent, the slip agent and the reinforcing agent contained in the upper layer 2 can be used in the field of antistatic agents, slip agents and reinforcing agents.
• the core layer may contain from 60% to 100% of isotactic polypropylene based on the total weight of the core layer 1.
• the core layer 1 may further contain isotactic polypropylene and at least one selected from the group consisting of an antistatic agent, a slip agent, and a reinforcing agent, wherein the isotactic polypropylene is based on the total weight of the core layer.
• the content is more than 60% and less than 100%, and the balance is at least one selected from the group consisting of an antistatic agent, a slip agent, and a reinforcing agent.
• the antistatic agent, the slip agent and the reinforcing agent contained in the core layer 1 may employ an antistatic agent, a slip agent and a reinforcing agent which are generally used in the art.
• the lower layer 3 is connected to the functional layer 5 and above the functional layer 5.
• the lower layer 3 is a metallocene linear low density polyethylene containing one or more of an antistatic agent, a slip agent and a reinforcing agent, wherein the metallocene linear low density polyethylene has a content of 95% to 98%.
• Antistatic agents, slip agents and rigideners can be used in the field of antistatic agents, slip agents and Adding a new agent.
• the functional layer 5 is an ethylene-vinyl acetate copolymer containing an anti-blocking agent, wherein the content of the ethylene-vinyl acetate copolymer is 90% to 97%. And the ethylene-vinyl acetate copolymer has a VA content of 10% to 20% and a melt index of 2 to 10 g/min.
• the anti-blocking agent can be used in the field as a general-purpose anti-blocking agent.
• the non-adhesive biaxially oriented polypropylene film for paper-plastic composite can be directly applied to the paper printing, the packaging box or the paper-plastic composite through the functional layer 5 under the condition of heating and pressing.
• Composite the realization of the paper-plastic composite without gel. This not only eliminates the complicated glue coating process, but also has the environmental protection characteristics of the pre-coating film without pollution, and has high composite strength with the printing materials such as paper, stable quality, low price and high cost performance.
• non-adhesive biaxially oriented polypropylene film for paper-plastic composite can be made into a bright or matt polypropylene film by using different materials on the upper surface layer 4, that is, when the upper surface layer 4 is used, etc.
• the haze of the non-adhesive biaxially oriented polypropylene film for paper-plastic composite according to the embodiment of the present invention can reach ⁇ 3%, so that the surface brightness of the product after coating is higher; and when the upper surface layer is 4 ⁇ When the matt polypropylene is used, the haze of the rubber-free biaxially oriented polypropylene film for paper-plastic composite according to the embodiment of the present invention can be more than 70%, so that the coated article exhibits a soft and elegant appearance.
• the total thickness of the rubber-free biaxially oriented polypropylene film for paper-plastic composite according to the embodiment of the present invention is between 17 ⁇ -21 ⁇ , wherein the thickness of the functional layer is between 2.5 ⁇ -4.5 ⁇ , and the thickness of the upper surface layer is 2.5 ⁇ -3.5 ⁇ between.
• niobium is the raw material (including the main raw material, the modified material, the additive masterbatch), B is the melt, and C is the thick sheet.
• D is a film
• E is a finished product
• F is an extruder extrusion process
• G is a die
• a cast casting chiller is used for the melt forming process
• H is a biaxial stretching process
• I is an aging treatment
• J is a minute. Cutting process.
• the preparation method comprises the following steps:
• the screened raw material A is pre-mixed according to the formula design, and after being stirred, it is sent to the measuring silo of the extrusion equipment through the feeding system, and the pre-mixed material is metered and then injected into the extrusion equipment through the extruder.
• the extrusion process F is plasticized, and the plasticization is sufficient to form a uniformly melted melt B.
• the melt B is piped to a filtering device for filtration, and then piped to a die for forming, through a die, casting and casting.
• the sheet chilling device forms a slab C for the melt forming step G; again, the slab C is subjected to the biaxial stretching process H to form the film D; finally, the thickness of the film D after stretching is detected and controlled by an on-line automatic thickness measuring device.
• the film D is treated by corona or flame to increase the surface tension, and then the processed film D is wound into a parent roll, the mother roll is subjected to the aging treatment I, and finally the finished product E is formed by the slitting process J.
• the process conditions used in the present invention include: The temperature of the extrusion apparatus and the die is controlled at 225 ° C - 265 ° C, and the temperature of the cast slab is controlled at 18 ° C - 50 ° C. According to the configuration of the equipment, two-step stretching or synchronous stretching is used, and biaxial stretching equipment is usually used.
• the stretching method is a two-step stretching process of longitudinal stretching and transverse stretching.
• the longitudinal stretching temperature is controlled at 80 ° C to 140 ° C and the longitudinal stretching ratio is 4.8-6; the transverse stretching temperature is controlled at 150 ° C to 170 ° C and the transverse stretching ratio is 8 to 9.5.
• the surface treatment strength is 32-43 mN/m.
• Example 1 A rubber-free biaxially oriented polypropylene film having a width of 8 m was exemplified and described in detail.
• the anti-blocking agent can be a universal type, such as Shulman ABPP05.
• Both the upper layer 2 and the core layer 1 are 93%-97.5% isotactic polypropylene plus 2.5%-7% antistatic agent.
• Antistatic agent ⁇ can be used for versatility, such as Shulman ASPA2485 or domestic AY088.
• the lower layer 3 is 95% to 98% metallocene linear low density polyethylene plus 2% to 5% antistatic agent.
• the upper surface layer 4 is 95%-98% matt polypropylene (matte material) plus 2%-5% anti-blocking agent; the matting material is universal type, such as: Foshan Plastic M973, anti-blocking agent is general-purpose type Can be, such as: Shulman ABPP05.
• the prepared product has a thickness of 20 ⁇ m, wherein the functional layer 5 has a thickness of 4 ⁇ m and the upper surface layer 4 has a thickness of 3 ⁇ m.
• the conditions used in the preparation process include:
• the German BRUCKNER two-step stretched polypropylene film production line is used.
• the temperature of the extruder and the die is 225 ⁇ 265 °C
• the temperature of the cast slab is 30 °C
• the temperature of the longitudinal drawing unit is 80.
• ⁇ 140 ° C the longitudinal stretching ratio is 5
• the temperature of the transverse stretching unit is controlled at 150 ⁇ 170 ° C
• the transverse stretching ratio is 9.
• the corona treatment power is 25w. min/m2.
• the properties of the prepared products are as follows:
• Thickness 20um
• Example 2 A rubber-free biaxially oriented polypropylene film having a width of 8 m was taken as an example for detailed description. As shown in Figure 1, the functional layer 5 is 96% ethylene-vinyl acetate copolymer (EVA) plus 4% anti-blocking agent;
• EVA ethylene-vinyl acetate copolymer
• Yanshan Petrochemical and DuPont are available.
• the anti-blocking agent is a general-purpose type, such as: Shulman ABPP05.
• Both the upper layer 2 and the core layer 1 are 95% isotactic polypropylene plus 5% antistatic agent, and the antistatic agent can be used universally, such as Shulman ASPA2485.
• the lower layer 3 is 96% metallocene linear low density polyethylene plus 4% antistatic agent.
• the upper surface layer 4 is 95% isotactic polypropylene plus 5% anti-blocking agent.
• the thickness of the prepared product was 18 ⁇ m, and the thickness of the functional layer 5 was 3 ⁇ m; the thickness of the upper surface layer 4 was 3 ⁇ m.
• the conditions used in the preparation method and the preparation process of the present embodiment are as in Example 1, and are not described herein again.
• the properties of the prepared products are as follows:

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Laminated Bodies (AREA)
• Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

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• 2012
  • 2012-08-06 CN CN2012102774949A patent/CN102794966A/zh active Pending
• 2013
  • 2013-08-06 WO PCT/CN2013/080890 patent/WO2014023219A1/fr not_active Ceased

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