CN112123897A - High-temperature-resistant flame-retardant BOPP isolating film and preparation method thereof - Google Patents
High-temperature-resistant flame-retardant BOPP isolating film and preparation method thereof Download PDFInfo
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- CN112123897A CN112123897A CN202010864612.0A CN202010864612A CN112123897A CN 112123897 A CN112123897 A CN 112123897A CN 202010864612 A CN202010864612 A CN 202010864612A CN 112123897 A CN112123897 A CN 112123897A
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 119
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 239000011127 biaxially oriented polypropylene Substances 0.000 title claims abstract description 71
- 229920006378 biaxially oriented polypropylene Polymers 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000012528 membrane Substances 0.000 claims abstract description 31
- 229920005629 polypropylene homopolymer Polymers 0.000 claims abstract description 23
- -1 polypropylene Polymers 0.000 claims abstract description 22
- 239000004743 Polypropylene Substances 0.000 claims abstract description 20
- 229920001155 polypropylene Polymers 0.000 claims abstract description 20
- 239000002981 blocking agent Substances 0.000 claims abstract description 19
- 239000011521 glass Substances 0.000 claims abstract description 17
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 16
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 16
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 16
- 238000001029 thermal curing Methods 0.000 claims abstract description 15
- 239000011324 bead Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 14
- 238000006116 polymerization reaction Methods 0.000 claims description 8
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N 1,4-Benzenediol Natural products OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 7
- 125000000687 hydroquinonyl group Chemical group C1(O)=C(C=C(O)C=C1)* 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 239000004005 microsphere Substances 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 7
- 150000001336 alkenes Chemical group 0.000 claims 1
- 238000003825 pressing Methods 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 98
- 230000005250 beta ray Effects 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical group OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 125000006160 pyromellitic dianhydride group Chemical group 0.000 description 5
- 229920001187 thermosetting polymer Polymers 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 3
- 238000001723 curing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 238000011056 performance test Methods 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
- B32B27/06—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
- 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
- B29C48/03—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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
- B32B27/26—Layered products comprising a layer of synthetic resin characterised by the use of special additives using curing agents
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a high-temperature-resistant flame-retardant BOPP isolating membrane and a preparation method thereof, and relates to the technical field of BOPP films, wherein the BOPP isolating membrane consists of a high-temperature-resistant layer, a flame-retardant layer and a high-temperature-resistant layer from top to bottom in sequence; the material of the high temperature resistant layer comprises the following components in percentage by weight: 90-94% of homo-polypropylene, 0.2-0.5% of thermal curing agent, 4-6% of cross-linking agent, 0.3-0.5% of antioxidant and 1-3% of anti-blocking agent; wherein the anti-blocking agent consists of glass beads and homopolymerized polypropylene; the flame-retardant layer is made of the following components in percentage by weight: 80-90% of homopolymerized polypropylene and 10-20% of flame-retardant master batch. The invention can be prepared by adopting a production line of a common BOPP film without additional growth equipment, and the prepared BOPP isolating film has good high-temperature resistance, stable size during pressing and easy peeling, and is suitable for high-temperature isolation pressing of industrial circuit boards and building boards.
Description
Technical Field
The invention relates to the technical field of BOPP films, in particular to a high-temperature-resistant flame-retardant BOPP isolating film and a preparation method thereof.
Background
BOPP packaging films are in a variety of types, but BOPP isolating films for interlayer high-temperature isolation of industrial circuit boards and building boards are not common, the product has high heat resistance requirements on films, the heat resistance temperature is required to be 160-170 ℃, and meanwhile, the film has good dimensional stability and flame retardance during lamination.
In the prior art, the aim of improving the heat resistance of the film is achieved mainly by improving the crystallinity of the film through raw material improvement and process condition optimization, for example, patents CN1154374A, CN144004A and CN101460553A respectively improve the crystallinity of the film through raw material improvement and process condition control, so that the heat resistance of the film is improved to a certain extent, but the improvement degree is limited.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides the high-temperature-resistant flame-retardant BOPP isolating film and the preparation method thereof, and the prepared BOPP isolating film has the advantages of high temperature resistance, good size stability and high mechanical strength.
The high-temperature-resistant flame-retardant BOPP isolating membrane provided by the invention sequentially consists of a high-temperature-resistant layer, a flame-retardant layer and a high-temperature-resistant layer from top to bottom;
the material of the high temperature resistant layer comprises the following components in percentage by weight: 90-94% of homo-polypropylene, 0.2-0.5% of thermal curing agent, 4-6% of cross-linking agent, 0.3-0.5% of antioxidant and 1-3% of anti-blocking agent; wherein the anti-blocking agent consists of glass beads and homopolymerized polypropylene;
the flame-retardant layer is made of the following components in percentage by weight: 80-90% of homopolymerized polypropylene and 10-20% of flame-retardant master batch.
Preferably, the thickness of the high-temperature-resistant flame-retardant BOPP isolating film is 25-50 μm; preferably, the total thickness of the high temperature resistant layer is 5-10% of the thickness of the high temperature resistant flame retardant BOPP isolating film.
Preferably, the weight percentage of the glass microspheres and the homopolymerized polypropylene in the anti-blocking agent is 30-50: 50-70 parts of; preferably, the glass microspheres have a particle size of 2-4 μm.
Preferably, the homopolymerized polypropylene has the polymerization degree of 97-98% and the melt index of 2.0-3.0g/10 min.
Preferably, the thermal curing agent is an aromatic anhydride.
Preferably, the crosslinking agent is an ethylenic monomer.
Preferably, the antioxidant is hydroquinone.
Preferably, the flame-retardant master batch is a mixed product of a nitrogen halogen-free flame retardant MCA and homo-polypropylene.
The invention also provides a preparation method of the high-temperature-resistant flame-retardant BOPP isolating membrane, which comprises the following steps:
s1, adding the raw materials of each component of the flame-retardant layer into a main extruder for melt extrusion, and filtering by a filter screen to obtain a flame-retardant layer melt; adding the raw materials of each component of the high-temperature-resistant layer into an auxiliary extruder for melt extrusion, and filtering by a filter screen to obtain a high-temperature-resistant layer melt;
s2, converging and extruding the high-temperature-resistant layer melt, the flame-retardant layer melt and the high-temperature-resistant layer melt at a die head lip of the three-layer extruder to obtain a membrane; attaching the membrane to a chill roll by using a high-pressure air knife to be quenched to form a cast sheet;
s3, longitudinally stretching the cast sheet into a sheet;
and S4, transversely stretching the sheet at a high temperature, and cooling to obtain the high-temperature-resistant flame-retardant BOPP isolating film.
Preferably, in S4, the transverse stretching temperature is 165-175 ℃.
The preparation method further comprises the steps of introducing the prepared high-temperature-resistant flame-retardant BOPP isolating 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: the invention provides a high-temperature-resistant flame-retardant BOPP isolating membrane, which is prepared by converging and extruding a high-temperature-resistant layer, a flame-retardant layer and a high-temperature-resistant layer melt in a three-layer T-shaped die head, rapidly cooling by a chill roll, attaching by a high-pressure air knife to form a cast sheet, and then sequentially carrying out longitudinal stretching, transverse stretching and crosslinking curing. The heat-resistant curing agent and the cross-linking agent added in the high-temperature resistant layer cross-link and cure the amorphous region of the homo-polypropylene while transversely stretching at high temperature, so that the heat resistance of the BOPP isolating membrane can be effectively improved, and the temperature resistance can reach 173 ℃; the high-temperature resistant layer and the flame retardant layer both adopt homo-polypropylene with high polymerization degree and low melt index, and can improve the mechanical property and the thermal stability of the film, so that the transverse thermal shrinkage of the film is less than 0.5 percent, and the longitudinal thermal shrinkage of the film is less than 1.0 percent; and the flame-retardant master batch is added into the flame-retardant layer, and the flame-retardant grade can reach V-0 grade. In addition, the invention can be prepared by adopting a production line of a common BOPP film without additional production equipment, and the prepared BOPP isolating film has good high-temperature resistance, stable size during pressing and easy peeling, and is suitable for high-temperature isolation pressing of industrial circuit boards and building boards.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
The high-temperature-resistant flame-retardant BOPP isolating membrane provided by the invention sequentially consists of a high-temperature-resistant layer, a flame-retardant layer and a high-temperature-resistant layer from top to bottom; the thickness of the high-temperature-resistant flame-retardant BOPP isolating film is 27 mu m, and the total thickness of the high-temperature-resistant layer is 5 percent of the thickness of the high-temperature-resistant flame-retardant BOPP isolating film.
The material of the high temperature resistant layer comprises the following components in percentage by weight: 90% of homo-polypropylene, 0.5% of thermal curing agent, 6% of cross-linking agent, 0.5% of antioxidant and 3% of anti-blocking agent; wherein the anti-blocking agent consists of 30 percent of glass beads and 70 percent of homopolymerized polypropylene, and the particle size of the glass beads is 2 mu m; the thermal curing agent is pyromellitic dianhydride; the cross-linking agent is hydroxyethyl acrylate; the antioxidant is hydroquinone.
The flame-retardant layer is made of the following components in percentage by weight: 80% of homo-polypropylene and 20% of flame-retardant master batch; wherein the flame-retardant master batch is a mixed mixture of a nitrogen halogen-free flame retardant MCA and homo-polypropylene.
The polymerization degree of the homopolymerized polypropylene adopted in the material is 97%, and the melt index is 2.0g/10 min.
The invention also provides a preparation method of the high-temperature-resistant flame-retardant BOPP isolating membrane, which comprises the following steps:
s1, adding the raw materials of each component of the flame-retardant layer into a main extruder for melt extrusion, and filtering by a filter screen to obtain a flame-retardant layer melt; adding the raw materials of each component of the high-temperature-resistant layer into an auxiliary extruder for melt extrusion, and filtering by a filter screen to obtain a high-temperature-resistant layer melt;
s2, converging and extruding the high-temperature-resistant layer melt, the flame-retardant layer melt and the high-temperature-resistant layer melt at a die head lip of the three-layer extruder to obtain a membrane; attaching the membrane to a chill roll by using a high-pressure air knife to be quenched to form a cast sheet;
s3, longitudinally stretching the cast sheet into a sheet;
s4, transversely stretching the sheet at a high temperature of 165 ℃, carrying out thermosetting crosslinking on the high-temperature-resistant layer while transversely stretching the film, and rapidly cooling and shaping the crosslinked film at a natural temperature to obtain the high-temperature-resistant flame-retardant BOPP isolating film;
and S5, introducing the prepared high-temperature-resistant flame-retardant BOPP isolating 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
The high-temperature-resistant flame-retardant BOPP isolating membrane provided by the invention sequentially consists of a high-temperature-resistant layer, a flame-retardant layer and a high-temperature-resistant layer from top to bottom; the thickness of the high-temperature-resistant flame-retardant BOPP isolating film is 32 mu m, and the total thickness of the high-temperature-resistant layer is 7 percent of the thickness of the high-temperature-resistant flame-retardant BOPP isolating film.
The material of the high temperature resistant layer comprises the following components in percentage by weight: 91% of homo-polypropylene, 0.5% of thermal curing agent, 5% of cross-linking agent, 0.5% of antioxidant and 3% of anti-blocking agent; wherein the anti-blocking agent consists of 40 percent of glass beads and 60 percent of homopolymerized polypropylene, and the particle size of the glass beads is 3 mu m; the thermal curing agent is pyromellitic dianhydride; the cross-linking agent is hydroxyethyl acrylate; the antioxidant is hydroquinone.
The flame-retardant layer is made of the following components in percentage by weight: 85% of homo-polypropylene and 15% of flame-retardant master batch; wherein the flame-retardant master batch is a mixed mixture of a nitrogen halogen-free flame retardant MCA and homo-polypropylene.
The homopolymerized polypropylene adopted in the material has the polymerization degree of 97.5 percent and the melt index of 2.5g/10 min.
The invention also provides a preparation method of the high-temperature-resistant flame-retardant BOPP isolating membrane, which comprises the following steps:
s1, adding the raw materials of each component of the flame-retardant layer into a main extruder for melt extrusion, and filtering by a filter screen to obtain a flame-retardant layer melt; adding the raw materials of each component of the high-temperature-resistant layer into an auxiliary extruder for melt extrusion, and filtering by a filter screen to obtain a high-temperature-resistant layer melt;
s2, converging and extruding the high-temperature-resistant layer melt, the flame-retardant layer melt and the high-temperature-resistant layer melt at a die head lip of the three-layer extruder to obtain a membrane; attaching the membrane to a chill roll by using a high-pressure air knife to be quenched to form a cast sheet;
s3, longitudinally stretching the cast sheet into a sheet;
s4, transversely stretching the sheet at a high temperature of 170 ℃, carrying out thermosetting crosslinking on the high-temperature-resistant layer while transversely stretching the film, and rapidly cooling and shaping the crosslinked film at a natural temperature to obtain the high-temperature-resistant flame-retardant BOPP isolating film;
and S5, introducing the prepared high-temperature-resistant flame-retardant BOPP isolating film into a traction system for flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
Example 3
The high-temperature-resistant flame-retardant BOPP isolating membrane provided by the invention sequentially consists of a high-temperature-resistant layer, a flame-retardant layer and a high-temperature-resistant layer from top to bottom; the thickness of the high-temperature-resistant flame-retardant BOPP isolating film is 38 mu m, and the total thickness of the high-temperature-resistant layer is 8 percent of the thickness of the high-temperature-resistant flame-retardant BOPP isolating film.
The material of the high temperature resistant layer comprises the following components in percentage by weight: 92% of homo-polypropylene, 0.2% of thermal curing agent, 4.5% of cross-linking agent, 0.3% of antioxidant and 3% of anti-blocking agent; wherein the anti-blocking agent consists of 50 percent of glass beads and 50 percent of homopolymerized polypropylene, and the particle size of the glass beads is 3 mu m; the thermal curing agent is pyromellitic dianhydride; the cross-linking agent is hydroxyethyl acrylate; the antioxidant is hydroquinone.
The flame-retardant layer is made of the following components in percentage by weight: 90% of homo-polypropylene and 10% of flame-retardant master batch; wherein the flame-retardant master batch is a mixed mixture of a nitrogen halogen-free flame retardant MCA and homo-polypropylene.
The polymerization degree of the homopolymerized polypropylene adopted in the material is 98%, and the melt index is 3.0g/10 min.
The invention also provides a preparation method of the high-temperature-resistant flame-retardant BOPP isolating membrane, which comprises the following steps:
s1, adding the raw materials of each component of the flame-retardant layer into a main extruder for melt extrusion, and filtering by a filter screen to obtain a flame-retardant layer melt; adding the raw materials of each component of the high-temperature-resistant layer into an auxiliary extruder for melt extrusion, and filtering by a filter screen to obtain a high-temperature-resistant layer melt;
s2, converging and extruding the high-temperature-resistant layer melt, the flame-retardant layer melt and the high-temperature-resistant layer melt at a die head lip of the three-layer extruder to obtain a membrane; attaching the membrane to a chill roll by using a high-pressure air knife to be quenched to form a cast sheet;
s3, longitudinally stretching the cast sheet into a sheet;
s4, transversely stretching the sheet at a high temperature of 170 ℃, carrying out thermosetting crosslinking on the high-temperature-resistant layer while transversely stretching the film, and rapidly cooling and shaping the crosslinked film at a natural temperature to obtain the high-temperature-resistant flame-retardant BOPP isolating film;
and S5, introducing the prepared high-temperature-resistant flame-retardant BOPP isolating film into a traction system for flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
Example 4
The high-temperature-resistant flame-retardant BOPP isolating membrane provided by the invention sequentially consists of a high-temperature-resistant layer, a flame-retardant layer and a high-temperature-resistant layer from top to bottom; the thickness of the high-temperature-resistant flame-retardant BOPP isolating film is 42 mu m, and the total thickness of the high-temperature-resistant layer is 9 percent of the thickness of the high-temperature-resistant flame-retardant BOPP isolating film.
The material of the high temperature resistant layer comprises the following components in percentage by weight: 94% of homo-polypropylene, 0.5% of thermal curing agent, 4% of cross-linking agent, 0.5% of antioxidant and 1% of anti-blocking agent; wherein the anti-blocking agent consists of 40 percent of glass beads and 60 percent of homopolymerized polypropylene, and the particle size of the glass beads is 4 mu m; the thermal curing agent is pyromellitic dianhydride; the cross-linking agent is hydroxyethyl acrylate; the antioxidant is hydroquinone.
The flame-retardant layer is made of the following components in percentage by weight: 80% of homo-polypropylene and 20% of flame-retardant master batch; wherein the flame-retardant master batch is a mixed mixture of a nitrogen halogen-free flame retardant MCA and homo-polypropylene.
The polymerization degree of the homopolymerized polypropylene adopted in the material is 97%, and the melt index is 2.5g/10 min.
The invention also provides a preparation method of the high-temperature-resistant flame-retardant BOPP isolating membrane, which comprises the following steps:
s1, adding the raw materials of each component of the flame-retardant layer into a main extruder for melt extrusion, and filtering by a filter screen to obtain a flame-retardant layer melt; adding the raw materials of each component of the high-temperature-resistant layer into an auxiliary extruder for melt extrusion, and filtering by a filter screen to obtain a high-temperature-resistant layer melt;
s2, converging and extruding the high-temperature-resistant layer melt, the flame-retardant layer melt and the high-temperature-resistant layer melt at a die head lip of the three-layer extruder to obtain a membrane; attaching the membrane to a chill roll by using a high-pressure air knife to be quenched to form a cast sheet;
s3, longitudinally stretching the cast sheet into a sheet;
s4, transversely stretching the sheet at high temperature, wherein the transverse stretching temperature is 175 ℃, the film is transversely stretched, the high-temperature-resistant layer is subjected to thermosetting crosslinking, and the crosslinked film is rapidly cooled and shaped at natural temperature to obtain the high-temperature-resistant flame-retardant BOPP isolating film;
and S5, introducing the prepared high-temperature-resistant flame-retardant BOPP isolating film into a traction system for flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
Example 5
The high-temperature-resistant flame-retardant BOPP isolating membrane provided by the invention sequentially consists of a high-temperature-resistant layer, a flame-retardant layer and a high-temperature-resistant layer from top to bottom; the thickness of the high-temperature-resistant flame-retardant BOPP isolating film is 50 mu m, and the total thickness of the high-temperature-resistant layer is 6 percent of the thickness of the high-temperature-resistant flame-retardant BOPP isolating film.
The material of the high temperature resistant layer comprises the following components in percentage by weight: 93% of homo-polypropylene, 0.4% of thermal curing agent, 4.2% of cross-linking agent, 0.4% of antioxidant and 2% of anti-blocking agent; wherein the anti-blocking agent consists of 40 percent of glass beads and 60 percent of homopolymerized polypropylene, and the particle size of the glass beads is 4 mu m; the thermal curing agent is pyromellitic dianhydride; the cross-linking agent is hydroxyethyl acrylate; the antioxidant is hydroquinone.
The flame-retardant layer is made of the following components in percentage by weight: 80% of homo-polypropylene and 20% of flame-retardant master batch; wherein the flame-retardant master batch is a mixed mixture of a nitrogen halogen-free flame retardant MCA and homo-polypropylene.
The polymerization degree of the homopolymerized polypropylene adopted in the material is 97%, and the melt index is 2.5g/10 min.
The invention also provides a preparation method of the high-temperature-resistant flame-retardant BOPP isolating membrane, which comprises the following steps:
s1, adding the raw materials of each component of the flame-retardant layer into a main extruder for melt extrusion, and filtering by a filter screen to obtain a flame-retardant layer melt; adding the raw materials of each component of the high-temperature-resistant layer into an auxiliary extruder for melt extrusion, and filtering by a filter screen to obtain a high-temperature-resistant layer melt;
s2, converging and extruding the high-temperature-resistant layer melt, the flame-retardant layer melt and the high-temperature-resistant layer melt at a die head lip of the three-layer extruder to obtain a membrane; attaching the membrane to a chill roll by using a high-pressure air knife to be quenched to form a cast sheet;
s3, longitudinally stretching the cast sheet into a sheet;
s4, transversely stretching the sheet at high temperature, wherein the transverse stretching temperature is 175 ℃, the film is transversely stretched, the high-temperature-resistant layer is subjected to thermosetting crosslinking, and the crosslinked film is rapidly cooled and shaped at natural temperature to obtain the high-temperature-resistant flame-retardant BOPP isolating film;
and S5, introducing the prepared high-temperature-resistant flame-retardant BOPP isolating film into a traction system for flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
Comparative example 1
Compared with example 1, the only difference is that the material of the high temperature resistant layer consists of the following components in percentage by weight: 96.5% of homopolymerized polypropylene, 0.5% of antioxidant and 3% of anti-blocking agent; the other conditions and preparation process were the same as in example 1.
Comparative example 2
According to the method disclosed in the embodiment 1 of Chinese patent CN201711170213 'BOPP high-temperature resistant protective film and preparation method', the BOPP protective film is prepared, and the preparation process conditions are the same as those in the embodiment 1 of the invention.
The BOPP films prepared in the above examples 1 to 5 and comparative examples were subjected to a high temperature resistance test, and the test results are shown in table 1.
TABLE 1 results of performance test of BOPP films prepared in examples 1 to 5 and comparative examples 1 to 2
As can be seen from Table 1, the BOPP high-temperature resistant films prepared in the embodiments 1 to 5 of the invention have higher melting point, smaller thermal shrinkage and better flame retardant property compared with the BOPP high-temperature resistant films prepared in the comparative examples.
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 (10)
1. The high-temperature-resistant flame-retardant BOPP isolating membrane is characterized by sequentially consisting of a high-temperature-resistant layer, a flame-retardant layer and a high-temperature-resistant layer from top to bottom;
the material of the high temperature resistant layer comprises the following components in percentage by weight: 90-94% of homo-polypropylene, 0.2-0.5% of thermal curing agent, 4-6% of cross-linking agent, 0.3-0.5% of antioxidant and 1-3% of anti-blocking agent; wherein the anti-blocking agent consists of glass beads and homopolymerized polypropylene;
the flame-retardant layer is made of the following components in percentage by weight: 80-90% of homopolymerized polypropylene and 10-20% of flame-retardant master batch.
2. The high temperature resistant and flame retardant BOPP separation film according to claim 1, wherein the thickness of the high temperature resistant and flame retardant BOPP separation film is 25-50 μm; preferably, the total thickness of the high temperature resistant layer is 5-10% of the thickness of the high temperature resistant flame retardant BOPP isolating film.
3. The high temperature resistant and flame retardant BOPP isolating film according to claim 1 or 2, wherein the weight percentage of the glass beads and the homo-polypropylene in the anti-blocking agent is 30-50: 50-70 parts of; preferably, the glass microspheres have a particle size of 2-4 μm.
4. The high temperature resistant flame retardant BOPP separation film according to any one of claims 1 to 3, wherein the homopolymerized polypropylene has a polymerization degree of 97 to 98 percent and a melt index of 2.0 to 3.0g/10 min.
5. The high temperature resistant and flame retardant BOPP separation film according to any one of claims 1 to 4, wherein the thermal curing agent is an aromatic anhydride.
6. The high temperature resistant flame retardant BOPP separation film according to any one of claims 1 to 5, wherein the cross-linking agent is an alkene monomer.
7. The high temperature resistant and flame retardant BOPP separation film according to any one of claims 1 to 6, wherein the antioxidant is hydroquinone.
8. The high temperature resistant and flame retardant BOPP separation film according to any one of claims 1 to 7, wherein the flame retardant master batch is a mixed product of a nitrogen-based halogen-free flame retardant MCA and homo-polypropylene.
9. The preparation method of the high-temperature-resistant flame-retardant BOPP isolating film based on any one of claims 1 to 8 is characterized by comprising the following steps of:
s1, adding the raw materials of each component of the flame-retardant layer into a main extruder for melt extrusion, and filtering by a filter screen to obtain a flame-retardant layer melt; adding the raw materials of each component of the high-temperature-resistant layer into an auxiliary extruder for melt extrusion, and filtering by a filter screen to obtain a high-temperature-resistant layer melt;
s2, converging and extruding the high-temperature-resistant layer melt, the flame-retardant layer melt and the high-temperature-resistant layer melt at a die head lip of the three-layer extruder to obtain a membrane; attaching the membrane to a chill roll by using a high-pressure air knife to be quenched to form a cast sheet;
s3, longitudinally stretching the cast sheet into a sheet;
and S4, transversely stretching the sheet at a high temperature, and cooling to obtain the high-temperature-resistant flame-retardant BOPP isolating film.
10. The method as claimed in claim 9, wherein the stretching temperature in the transverse direction of S4 is 165-175 ℃.
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| CN116766720A (en) * | 2023-06-08 | 2023-09-19 | 上海人民塑料印刷厂有限公司 | Plastic film based on laser technology and preparation process thereof |
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| CN116766720A (en) * | 2023-06-08 | 2023-09-19 | 上海人民塑料印刷厂有限公司 | Plastic film based on laser technology and preparation process thereof |
| CN116766720B (en) * | 2023-06-08 | 2024-03-26 | 上海人民塑料印刷厂有限公司 | Plastic film based on laser technology and preparation process thereof |
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