CN112123906A - Curl-free BOPP (biaxially-oriented Polypropylene) matt film and preparation method thereof - Google Patents
Curl-free BOPP (biaxially-oriented Polypropylene) matt film and preparation method thereof Download PDFInfo
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- 229920006378 biaxially oriented polypropylene Polymers 0.000 title claims abstract description 75
- 239000011127 biaxially oriented polypropylene Substances 0.000 title claims abstract description 75
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 230000008033 biological extinction Effects 0.000 claims abstract description 93
- 239000010410 layer Substances 0.000 claims abstract description 65
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000012792 core layer Substances 0.000 claims abstract description 32
- -1 polypropylene Polymers 0.000 claims abstract description 31
- 239000004743 Polypropylene Substances 0.000 claims abstract description 29
- 229920001155 polypropylene Polymers 0.000 claims abstract description 29
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 17
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 16
- 229920005629 polypropylene homopolymer Polymers 0.000 claims abstract description 16
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000002216 antistatic agent Substances 0.000 claims abstract description 9
- 239000002667 nucleating agent Substances 0.000 claims abstract description 9
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000007822 coupling agent Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000000155 melt Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 11
- 238000006116 polymerization reaction Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000009998 heat setting Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000181 anti-adherent effect Effects 0.000 claims 1
- 238000004806 packaging method and process Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000005250 beta ray Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 244000061176 Nicotiana tabacum Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 235000015895 biscuits Nutrition 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 235000011869 dried fruits Nutrition 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 235000013616 tea Nutrition 0.000 description 1
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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
Abstract
The invention discloses a curl-free BOPP (biaxially-oriented Polypropylene) matt film and a preparation method thereof, relating to the technical field of BOPP films, wherein the matt film consists of an anti-adhesion layer, a core layer and a matt layer from top to bottom in sequence; the anti-blocking layer is made of the following components in percentage by weight: 95-99% of homo-polypropylene and 1-5% of anti-sticking master batch; wherein, the anti-sticking master batch consists of spherical silicon dioxide and homopolymerized polypropylene; the core layer is made of the following materials in percentage by weight: 90-95% of homopolymerized polypropylene, 0.5-1.5% of quaternary ammonium salt antistatic agent, 3-8% of stiffness increasing agent and 0.5-1.0% of RQT-CH polypropylene nucleating agent; the extinction layer is made of the following components in percentage by weight: 85-90% of BOPP extinction master batch, 9.5-14.5% of light calcium carbonate and 0.1-0.5% of monoalkoxyl coupling agent. The invention improves the stiffness of the core layer and eliminates the stress difference between the extinction layer and the core layer by optimizing the material components of the core layer and the extinction layer and the longitudinal drawing process conditions, so that the film is flat and has no curl.
Description
Technical Field
The invention relates to the technical field of BOPP films, in particular to a curl-free BOPP extinction film and a preparation method thereof.
Background
The extinction film is compounded and then used for food packaging (biscuits, dried fruits, tea leaves, cakes, dairy products and the like) to build an image of a natural product, and the covers of books, periodicals and magazines and the propaganda posters are compounded by the extinction film to have non-reflective appearances, thereby providing people with stereoscopic impression and good hand feeling. If the matting film is compounded with the packaging paper (or paper box), the grade of the packaging material can be remarkably improved, and the packaging material is widely applied to soap, tobacco, wine, clothes, shoes, perfume, cosmetics, medicines and the like; after the matting film is used, the effect of the paper product can be obtained for the packaging, a luxurious feeling is given to people, and the purchase desire of consumers is stimulated.
At present, the BOPP extinction film on the market generally has a curling phenomenon, and the flatness effect of the film surface is poor. For example, the "BOPP matting film and the preparation method thereof" disclosed in chinese patent CN108263058A, the product has good matting uniformity, but has a phenomenon that the matting surface curls towards the smooth surface, and the bag is easily warped after composite bag making, which adversely affects the flow line packaging of the end customer.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides the curl-free BOPP extinction film and the preparation method thereof, and the prepared BOPP extinction film has good flatness and uniform extinction layer dispersion.
The curl-free BOPP extinction film provided by the invention is sequentially composed of an anti-adhesion layer, a core layer and an extinction layer from top to bottom;
the anti-blocking layer is made of the following components in percentage by weight: 95-99% of homo-polypropylene and 1-5% of anti-sticking master batch; wherein, the anti-sticking master batch consists of spherical silicon dioxide and homopolymerized polypropylene;
the core layer is made of the following materials in percentage by weight: 90-95% of homopolymerized polypropylene, 0.5-1.5% of quaternary ammonium salt antistatic agent, 3-8% of stiffness increasing agent and 0.5-1.0% of RQT-CH polypropylene nucleating agent;
the extinction layer is made of the following components in percentage by weight: 85-90% of BOPP extinction master batch, 9.5-14.5% of light calcium carbonate and 0.1-0.5% of monoalkoxyl coupling agent.
Preferably, the thickness of the uncrimped BOPP matting film is 15 to 50 μm.
Preferably, the thickness of the matting layer is 10-25% of the thickness of the uncrimped BOPP matting film.
Preferably, in the anti-sticking master batch, the weight ratio of the spherical silica to the homo-polypropylene is 30-50: 50-70.
Preferably, the spherical silica has a particle size of 2 to 4 μm.
Preferably, the homopolymerized polypropylene has the polymerization degree of 97-99% and the melt index of 2.0-3.0g/10 min.
Preferably, in the extinction layer, the melt index of the BOPP extinction master batch is 2.0-3.0g/10 min.
The invention also provides a preparation method of the curl-free BOPP extinction film, which comprises the following steps:
a. adding the raw materials of each component of the core layer into a main extruder for melt extrusion to obtain a core layer melt; respectively adding the raw materials of each component of the anti-adhesion layer and the extinction layer into two auxiliary extruders for melt extrusion to respectively obtain an anti-adhesion layer melt and an extinction layer melt;
b. filtering the anti-adhesion layer melt, the core layer melt and the extinction layer melt through a filter screen respectively, converging at a lip of a die head with a T-shaped structure, extruding into a membrane, and attaching the membrane to a chilling roller by using a high-pressure air knife to quench so as to form a cast sheet;
c. preheating the casting sheet at the temperature of 120-140 ℃, and longitudinally stretching the casting sheet for 5.0-5.5 times at the temperature of 120-140 ℃ to obtain a thick film;
d. preheating the thick film at 180 ℃ under 170 ℃, transversely stretching 8-10 times at 160 ℃ under 150 ℃, then carrying out heat setting at 170 ℃ under 160 ℃, and then cooling and setting to obtain the curl-free BOPP extinction film.
The preparation method further comprises the steps of introducing the prepared non-curling BOPP extinction film into a traction system for flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
Has the advantages that: according to the invention, the core layer material adopts the homo-polypropylene with high polymerization degree and low melt index, so that the stiffness and smoothness of the core layer of the BOPP extinction film are enhanced, meanwhile, the stiffening agent and the polypropylene nucleating agent are added, and the film crystallinity and the longitudinal physical and mechanical properties are improved through the optimization of longitudinal drawing process conditions, so that the stiffness and smoothness of the core layer are further enhanced. Because the BOPP extinction master batch contains polyethylene components, and the molecular weight of the polyethylene is less than that of polypropylene, the extinction layer is softer. The BOPP extinction film prepared by the invention has high flatness and uniform dispersion of extinction layers, can meet the requirements of flatness and peel strength of various composite bag making, and is suitable for manufacturing special high-grade labels of household appliances, computer precision instruments and equipment and the like, packaging of indoor matte decoration materials and bagged products, and laminating films of high-grade cigarettes, wine and books.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A no-curl BOPP extinction film is composed of an anti-adhesion layer, a core layer and an extinction layer from top to bottom in sequence; wherein, the thickness of the uncrimped BOPP extinction film is 15 mu m, and the thickness of the extinction layer is 10 percent of the total thickness of the extinction film.
Wherein the anti-blocking layer is made of 95 wt% of homo-polypropylene and 5 wt% of anti-blocking master batch; wherein, the anti-sticking master batch consists of 30 wt% of spherical silicon dioxide and 70 wt% of homopolymerized polypropylene, and the particle size of the spherical silicon dioxide is 2 mu m;
the core layer is made of 90 wt% of homopolymerized polypropylene, 1.0 wt% of quaternary ammonium salt antistatic agent, 8.0 wt% of stiffness increasing agent and 1.0 wt% of RQT-CH polypropylene nucleating agent;
the extinction layer is made of 85 wt% of BOPP extinction master batch, 14.5 wt% of light calcium carbonate and 0.5 wt% of monoalkoxyl coupling agent; the BOPP extinction master batch can be a commercially available BOPP extinction master batch, and the DWM001-BOPP extinction master batch of Jiangsu German resource material science and technology Limited company is adopted in the embodiment, and the melt index is 2.0g/10 min.
The homopolypropylene used in the above raw material had a degree of polymerization of 97 wt% and a melt index of 2.0g/10 min.
The preparation method comprises the following steps:
a. adding the raw materials of each component of the core layer into a main extruder for melt extrusion to obtain a core layer melt; respectively adding the raw materials of each component of the anti-adhesion layer and the extinction layer into two auxiliary extruders for melt extrusion to respectively obtain an anti-adhesion layer melt and an extinction layer melt;
b. filtering the anti-adhesion layer melt, the core layer melt and the extinction layer melt through a filter screen respectively, converging at a lip of a die head with a T-shaped structure, extruding into a membrane, and attaching the membrane to a chilling roller by using a high-pressure air knife to quench so as to form a cast sheet;
c. preheating the cast sheet at 120 ℃, and longitudinally stretching the cast sheet for 5.0 times at 120 ℃ to obtain a thick film;
d. preheating the thick film at 170 ℃, transversely stretching 8 times at 150 ℃, then performing heat setting at 160 ℃, and cooling and setting to obtain a curl-free BOPP extinction film;
e. and introducing the prepared non-curled BOPP extinction film into a traction system for flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
Example 2
A no-curl BOPP extinction film is composed of an anti-adhesion layer, a core layer and an extinction layer from top to bottom in sequence; wherein, the thickness of the uncrimped BOPP extinction film is 20 mu m, and the thickness of the extinction layer is 15 percent of the total thickness of the extinction film.
Wherein the anti-blocking layer is made of 96 wt% of homopolymerized polypropylene and 4 wt% of anti-blocking master batch; wherein, the anti-sticking master batch consists of 35 wt% of spherical silicon dioxide and 65 wt% of homopolymerized polypropylene, and the particle size of the spherical silicon dioxide is 3 mu m;
the core layer is made of 92 wt% of homopolymerized polypropylene, 0.5 wt% of quaternary ammonium salt antistatic agent, 6.5 wt% of stiffness increasing agent and 1.0 wt% of RQT-CH polypropylene nucleating agent;
the extinction layer is made of 87 wt% of BOPP extinction master batch, 12.7 wt% of light calcium carbonate and 0.3 wt% of monoalkoxyl coupling agent; the BOPP extinction master batch can be a commercially available BOPP extinction master batch, and the M973-BOPP extinction master batch of the Pixing master batch Co., Ltd. in the example, has a melt index of 2.2g/10 min.
The homopolypropylene used in the above raw material had a degree of polymerization of 98 wt% and a melt index of 2.0g/10 min.
The preparation method is the same as example 1.
Example 3
A no-curl BOPP extinction film is composed of an anti-adhesion layer, a core layer and an extinction layer from top to bottom in sequence; wherein, the thickness of the uncrimped BOPP extinction film is 25 mu m, and the thickness of the extinction layer is 20 percent of the total thickness of the extinction film.
Wherein the material of the anti-blocking layer consists of 97 wt% of homo-polypropylene and 3 wt% of anti-blocking master batch; wherein, the anti-sticking master batch consists of 40 wt% of spherical silicon dioxide and 60 wt% of homopolymerized polypropylene, and the particle size of the spherical silicon dioxide is 4 mu m;
the core layer is made of 94 wt% of homopolymerized polypropylene, 1.0 wt% of quaternary ammonium salt antistatic agent, 4.2 wt% of stiffness increasing agent and 0.8 wt% of RQT-CH polypropylene nucleating agent;
the extinction layer is made of 88 wt% of BOPP extinction master batch, 11.8 wt% of light calcium carbonate and 0.2 wt% of monoalkoxyl coupling agent; the BOPP extinction master batch can be a commercially available BOPP extinction master batch, and the DWM001-BOPP extinction master batch of Jiangsu de Source materials science and technology Limited company is adopted in the embodiment, and the melt index is 2.7g/10 min.
The homopolypropylene used in the above raw material had a degree of polymerization of 98 wt% and a melt index of 2.3g/10 min.
The preparation method comprises the following steps: compared with the example 1, the difference is only the difference of the process parameters in the step c and the step d, and the specific difference is as follows:
c. preheating the cast sheet at 130 ℃, and longitudinally stretching the cast sheet for 5.2 times at 130 ℃ to obtain a thick film;
d. preheating the thick film at 175 ℃, transversely stretching the thick film by 9 times at 155 ℃, then carrying out heat setting at 165 ℃, and then cooling and setting to obtain the curl-free BOPP matt film.
Example 4
A no-curl BOPP extinction film is composed of an anti-adhesion layer, a core layer and an extinction layer from top to bottom in sequence; wherein the thickness of the uncrimped BOPP extinction film is 35 mu m, and the thickness of the extinction layer is 25 percent of the total thickness of the extinction film.
Wherein the anti-blocking layer is made of 98 wt% of homo-polypropylene and 2 wt% of anti-blocking master batch; wherein, the anti-sticking master batch consists of 45 wt% of spherical silicon dioxide and 55 wt% of homopolymerized polypropylene, and the particle size of the spherical silicon dioxide is 4 mu m;
the core layer is made of 95 wt% of homopolymerized polypropylene, 1.5 wt% of quaternary ammonium salt antistatic agent, 3 wt% of stiffness increasing agent and 0.5 wt% of RQT-CH polypropylene nucleating agent;
the extinction layer is made of 89 wt% of BOPP extinction master batch, 10.9 wt% of light calcium carbonate and 0.1 wt% of monoalkoxyl coupling agent; the BOPP extinction master batch can be a commercially available BOPP extinction master batch, and the M973-BOPP extinction master batch of the Pixing master batch Co., Ltd. in the example, has a melt index of 2.8g/10 min.
The homopolypropylene used in the above raw material had a degree of polymerization of 99 wt% and a melt index of 2.5g/10 min.
Preparation method example 4.
Example 5
A no-curl BOPP extinction film is composed of an anti-adhesion layer, a core layer and an extinction layer from top to bottom in sequence; wherein, the thickness of the uncrimped BOPP extinction film is 50 μm, and the thickness of the extinction layer is 15% of the total thickness of the extinction film.
Wherein the anti-blocking layer is made of 99 wt% of homo-polypropylene and 1 wt% of anti-blocking master batch; wherein, the anti-sticking master batch consists of 50 wt% of spherical silicon dioxide and 50 wt% of homopolymerized polypropylene, and the particle size of the spherical silicon dioxide is 3 mu m;
the core layer is made of 95 wt% of homopolymerized polypropylene, 0.5 wt% of quaternary ammonium salt antistatic agent, 4 wt% of stiffness increasing agent and 0.5 wt% of RQT-CH polypropylene nucleating agent;
the extinction layer is made of 90 wt% of BOPP extinction master batch, 9.5 wt% of light calcium carbonate and 0.5 wt% of monoalkoxyl coupling agent; the BOPP extinction master batch can be a commercially available BOPP extinction master batch, and the DWM001-BOPP extinction master batch of Jiangsu German resource material science and technology Limited company is adopted in the embodiment, and the melt index is 3.0g/10 min.
The homopolypropylene used in the above raw material had a degree of polymerization of 99 wt% and a melt index of 2.8g/10 min.
The preparation method comprises the following steps: compared with the example 1, the difference is only the difference of the process parameters in the step c and the step d, and the specific difference is as follows:
c. preheating the cast sheet at 140 ℃, and longitudinally stretching the cast sheet for 5.5 times at 140 ℃ to obtain a thick film;
d. and preheating the thick film at 180 ℃, transversely stretching the thick film by 10 times at 160 ℃, then performing heat setting at 170 ℃, and cooling and setting to obtain the curl-free BOPP matt film.
Comparative example 1
Compared with example 1, the difference is only that: the core layer is made of 99 wt% of homopolymerized polypropylene and 1.0 wt% of quaternary ammonium salt antistatic agent; the rest is the same.
Comparative example 2
Compared with example 1, the difference is only that: the extinction layer is made of 100 wt% of BOPP extinction master batch; the rest is the same.
The performance of the BOPP matting films prepared in examples 1 to 5 of the present invention and comparative examples 1 to 2 was tested, and the results are shown in table 1.
TABLE 1 data for the performance testing of BOPP matting films of examples 1-5 and comparative examples 1-2
As can be seen from Table 1, the BOPP matte films prepared in examples 1-5 have good curl resistance.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A curl-free BOPP extinction film is characterized by comprising an anti-adhesion layer, a core layer and an extinction layer from top to bottom in sequence;
the anti-blocking layer is made of the following components in percentage by weight: 95-99% of homo-polypropylene and 1-5% of anti-sticking master batch; wherein, the anti-sticking master batch consists of spherical silicon dioxide and homopolymerized polypropylene;
the core layer is made of the following materials in percentage by weight: 90-95% of homopolymerized polypropylene, 0.5-1.5% of quaternary ammonium salt antistatic agent, 3-8% of stiffness increasing agent and 0.5-1.0% of RQT-CH polypropylene nucleating agent;
the extinction layer is made of the following components in percentage by weight: 85-90% of BOPP extinction master batch, 9.5-14.5% of light calcium carbonate and 0.1-0.5% of monoalkoxyl coupling agent.
2. A uncrimped BOPP matting film according to claim 1, characterized in that it has a thickness of 15-50 μ ι η.
3. The uncrimped BOPP matting film according to claim 2, wherein the matting layer has a thickness of 10 to 25% of the thickness of the uncrimped BOPP matting film.
4. The curl-free BOPP matting film according to claim 1, wherein the weight ratio of spherical silica to homo-polypropylene in the anti-adhesive masterbatch is 30 to 50: 50-70.
5. The uncrimped BOPP matting film according to claim 4, wherein the spherical silica has a particle size of 2-4 μm.
6. A curl free BOPP matting film according to claim 1, wherein said homo-polypropylene has a degree of polymerization of 97 to 99% and a melt index of 2.0 to 3.0g/10 min.
7. The uncrimped BOPP matte film according to claim 1, wherein the matte layer has a BOPP matte master batch melt index of 2.0-3.0g/10 min.
8. A method of producing a uncrimped BOPP matting film according to any one of claims 1 to 7, characterized by the steps of:
a. adding the raw materials of each component of the core layer into a main extruder for melt extrusion to obtain a core layer melt; respectively adding the raw materials of each component of the anti-adhesion layer and the extinction layer into two auxiliary extruders for melt extrusion to respectively obtain an anti-adhesion layer melt and an extinction layer melt;
b. filtering the anti-adhesion layer melt, the core layer melt and the extinction layer melt through a filter screen respectively, converging at a lip of a die head with a T-shaped structure, extruding into a membrane, and attaching the membrane to a chilling roller by using a high-pressure air knife to quench so as to form a cast sheet;
c. preheating the casting sheet at the temperature of 120-140 ℃, and longitudinally stretching the casting sheet for 5.0-5.5 times at the temperature of 120-140 ℃ to obtain a thick film;
d. preheating the thick film at 180 ℃ under 170 ℃, transversely stretching 8-10 times at 160 ℃ under 150 ℃, then carrying out heat setting at 170 ℃ under 160 ℃, and then cooling and setting to obtain the curl-free BOPP extinction film.
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| CN115742489A (en) * | 2022-12-15 | 2023-03-07 | 江西省盛纬材料有限公司 | Thermal-process aluminum-plastic composite film and preparation method thereof |
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Application publication date: 20201225 |