CN114058282A - Nano calcium carbonate-based film and preparation process and device thereof - Google Patents
Nano calcium carbonate-based film and preparation process and device thereof Download PDFInfo
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- CN114058282A CN114058282A CN202111366157.2A CN202111366157A CN114058282A CN 114058282 A CN114058282 A CN 114058282A CN 202111366157 A CN202111366157 A CN 202111366157A CN 114058282 A CN114058282 A CN 114058282A
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- heating unit
- calcium carbonate
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- nano calcium
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 102
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 239000010410 layer Substances 0.000 claims abstract description 46
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 23
- 229920001577 copolymer Polymers 0.000 claims abstract description 18
- 239000011241 protective layer Substances 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000012790 adhesive layer Substances 0.000 claims abstract description 12
- 239000003607 modifier Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims abstract description 6
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920002614 Polyether block amide Polymers 0.000 claims abstract description 6
- 239000004743 Polypropylene Substances 0.000 claims abstract description 6
- 150000002191 fatty alcohols Chemical class 0.000 claims abstract description 6
- -1 polypropylene Polymers 0.000 claims abstract description 6
- 229920001155 polypropylene Polymers 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 62
- 238000001035 drying Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000009998 heat setting Methods 0.000 claims description 7
- 229920001661 Chitosan Polymers 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical compound [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 claims description 5
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 239000003381 stabilizer Substances 0.000 claims description 5
- NMEPHPOFYLLFTK-UHFFFAOYSA-N trimethoxy(octyl)silane Chemical compound CCCCCCCC[Si](OC)(OC)OC NMEPHPOFYLLFTK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 6
- 238000005266 casting Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000005476 size effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- 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
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- 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
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- B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
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- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/10—Homopolymers or copolymers of propene
- C09J123/14—Copolymers of propene
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- 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
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
- C08J2405/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C09J2423/04—Presence of homo or copolymers of ethene
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- C09J2423/00—Presence of polyolefin
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- C09J2423/106—Presence of homo or copolymers of propene in the substrate
Abstract
The invention relates to a film based on nano calcium carbonate and a preparation process and a device thereof, wherein the film comprises a base layer, the inner side and the outer side of the base layer are respectively provided with an adhesive layer and a protective layer, and the adhesive layer comprises the following components in parts by weight: a base layer: the thickness ratio of the protective layer is (2-2.5) to (7) (1-1.5); the base layer comprises the following components in parts by weight: 20-30 parts of nano calcium carbonate, 20-30 parts of ethylene-butylene copolymer, 5-10 parts of dimethylacetamide, 2-5 parts of a cross-linking agent and 2-5 parts of a modifier; the adhesive layer comprises 20-30 parts of propylene-butylene copolymer, 5-10 parts of nano calcium carbonate, 3-5 parts of monostearin, 3-5 parts of fatty alcohol polyether amide, 1-2 parts of cross-linking agent and 1-2 parts of modifying agent; the protective layer comprises 20-30 parts of ethylene-propylene copolymer, 20-30 parts of homopolymerized polypropylene, 5-10 parts of nano calcium carbonate, 1-3 parts of cross-linking agent and 1-3 parts of modifying agent. The film obtained by the invention has high quality, good flexibility and high tensile strength, and the device designed by the application is adopted to prepare the film, so that the forming is stable and smooth, the production quality is high, and the qualified yield is high.
Description
Technical Field
The invention belongs to the technical field of novel nanoscale materials, and provides a film based on nano calcium carbonate and a preparation process and a preparation device thereof.
Background
The nano calcium carbonate is also called ultra-fine calcium carbonate and ultra-fine calcium carbonate. Because the calcium carbonate particles are ultra-fine, the crystal structure and the surface electronic structure of the calcium carbonate particles are changed, the quantum size effect, the small size effect, the surface effect and the macroscopic quantum effect which are not possessed by the common calcium carbonate are generated, the particle size is fine and uniform, the distribution is narrow, the specific surface area is large, the surface activity and the dispersity are good, and the surface energy is high, so that the calcium carbonate particles embody more excellent performances which are not possessed by a plurality of common calcium carbonate materials in actual use. The nano calcium carbonate has application in the film industry, can improve the rheological property of a film master batch, improves the formability of the film master batch, has the functions of toughening and reinforcing, and improves the bending strength, the bending elastic modulus, the thermal deformation temperature and the dimensional stability of a film.
The existing technical field of films has a problem that the flexibility is not high on the premise of meeting the rigidity, so that the film in the field similar to an outer wrapping film has low use quality and the service life needs to be prolonged.
Disclosure of Invention
The invention provides a film based on nano calcium carbonate and a preparation process and a preparation device thereof, the obtained film has high quality, good flexibility and high tensile strength, and the device designed by the application is adopted to prepare the film, so that the forming is stable and smooth, the production quality is high, and the qualified yield is high.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the utility model provides a membrane based on nanometer calcium carbonate, includes the basic unit, the inside and outside branch of basic unit is equipped with adhesive linkage and inoxidizing coating, the adhesive linkage: a base layer: the thickness ratio of the protective layer is (2-2.5) to (7) (1-1.5); the base layer comprises the following components in parts by weight: 20-30 parts of nano calcium carbonate, 20-30 parts of ethylene-butylene copolymer, 5-10 parts of dimethylacetamide, 2-5 parts of a cross-linking agent and 2-5 parts of a modifier; the adhesive layer comprises 20-30 parts of propylene-butylene copolymer, 5-10 parts of nano calcium carbonate, 3-5 parts of monostearin, 3-5 parts of fatty alcohol polyether amide, 1-2 parts of cross-linking agent and 1-2 parts of modifying agent; the protective layer comprises 20-30 parts of ethylene-propylene copolymer, 20-30 parts of homopolymerized polypropylene, 5-10 parts of nano calcium carbonate, 1-3 parts of cross-linking agent and 1-3 parts of modifying agent.
More preferably, the particle size of the nano calcium carbonate is 0.01-0.05 μm.
Still further preferably, the cross-linking agent is one or two of phenyl triethoxysilane and octyl trimethoxysilane, the modifier comprises nano titanium dioxide, carboxymethyl chitosan, a calcium-zinc stabilizer and nano sodium silicate, and the proportion of the four is 2: (1.5-2): (1.25-1.5); 2.
based on the ingredients, the invention also provides a preparation process of the film based on the nano calcium carbonate, which comprises the following steps:
1) the raw materials of the bonding layer are proportioned, dried in a first drying unit and then conveyed to a first heating unit of an extruder by a first conveying device to be heated to a molten state; the base layer raw materials are proportioned, dried in a second drying unit and then conveyed to a second heating unit of the extruder by a second conveying device to be heated to a molten state; the raw materials of the protective layer are proportioned, dried in a third drying unit and then conveyed to a third heating unit of the extruder by a third conveying device to be heated to be molten; a discharge end of the first heating unit is provided with a 430-450-mesh filter screen, a discharge end of the second heating unit is provided with a 440-460-mesh filter screen, and a discharge end of the third heating unit is provided with a 430-450-mesh filter screen; the discharge ends of the first heating unit, the second heating unit and the third heating unit are correspondingly provided with die heads, the die heads are three-layer die heads, melts at the discharge ends of the first heating unit, the second heating unit and the third heating unit are converged and extruded from the three-layer die heads, and the temperature of the die heads is 245-255 ℃;
2) after the melt is extruded from the die head, attaching compressed air to a chilling roller at 15-18 ℃ for chilling to form a cast sheet, then cooling in water bath, and removing water from the cooled cast sheet by using the compressed air;
3) preheating the cast sheet at 125-135 ℃, and longitudinally extending at 115-118 ℃ with the extension ratio of 2.0-3.0; after longitudinal drawing, transversely extending the film, preheating at 150-160 ℃ before transverse drawing, stretching at 140-145 ℃, and performing heat setting at (160 +/-5) DEG C with the stretching ratio of 4.0-6.0 to prepare the film;
4) the film enters a traction device for flattening through air cooling;
5) cutting and packaging to obtain the finished product.
Further preferably, the die temperature in step 1) is (248 ± 1) ° c.
Still preferably, the casting sheet in the step 3) is preheated to 127 +/-1 ℃ and longitudinally extended at 115-118 ℃, and the extension ratio is 2.0-3.0; longitudinally stretching the film, transversely stretching the film after longitudinal stretching, preheating the film at (153 +/-1) DEG C before transverse stretching, stretching the film at (142 +/-1) DEG C, and performing heat setting at the stretching ratio of 4.0-6.0 to prepare the film.
Based on the process, the preparation device of the film based on the nano calcium carbonate comprises an extruder body, wherein the extruder body is sequentially provided with a bonding layer preparation front end part, a base layer preparation front end part and a protection layer preparation front end part from bottom to top, the bonding layer preparation front end part comprises a first drying unit, a first conveying device and a first heating unit which are sequentially arranged, the base layer preparation front end part comprises a second drying unit, a second conveying device and a second heating unit which are sequentially arranged, the protection layer preparation front end part comprises a third drying unit, a third conveying device and a third heating unit which are sequentially arranged, die heads are correspondingly arranged at the discharge ends of the first heating unit, the second heating unit and the third heating unit, the die heads are three die heads, and are formed by surrounding left, right and upper connecting blocks, and a converging extrusion part is positioned at the left side, The cavity position that encloses between the connecting blocks of three groups on the right side, goes up, and spout slider formula seamless connection between three connecting blocks, this spout is binding off the groove.
Furthermore, the discharge ports of the discharge ends of the first heating unit, the second heating unit and the third heating unit are flaring ports, and the flaring ports are concave arc-shaped flaring ports.
The invention has the technical effects that: the film obtained by the invention has high quality, good flexibility and high tensile strength, and the device designed by the application is adopted to prepare the film, so that the forming is stable and smooth, the production quality is high, and the qualified yield is high.
Drawings
FIG. 1 is a front view structural view of a die of a production apparatus of the present invention, in which a, b, and c respectively represent a protective layer, a base layer, and an adhesive layer;
FIG. 2 is a side view of the discharge part of the first, second and third heating units of the manufacturing apparatus of the present invention.
Detailed Description
The invention relates to a film based on nano calcium carbonate, which comprises a base layer, wherein the inner side and the outer side of the base layer are respectively provided with an adhesive layer and a protective layer, and the adhesive layer comprises the following components in parts by weight: a base layer: the thickness ratio of the protective layer is (2-2.5) to (7) (1-1.5); the base layer comprises the following components in parts by weight: 20-30 parts of nano calcium carbonate, 20-30 parts of ethylene-butylene copolymer, 5-10 parts of dimethylacetamide, 2-5 parts of a cross-linking agent and 2-5 parts of a modifier; the adhesive layer comprises 20-30 parts of propylene-butylene copolymer, 5-10 parts of nano calcium carbonate, 3-5 parts of monostearin, 3-5 parts of fatty alcohol polyether amide, 1-2 parts of cross-linking agent and 1-2 parts of modifying agent; the protective layer comprises 20-30 parts of ethylene-propylene copolymer, 20-30 parts of homopolymerized polypropylene, 5-10 parts of nano calcium carbonate, 1-3 parts of cross-linking agent and 1-3 parts of modifying agent.
More preferably, the particle size of the nano calcium carbonate is 0.01-0.05 μm.
Still further preferably, the cross-linking agent is one or two of phenyl triethoxysilane and octyl trimethoxysilane, the modifier comprises nano titanium dioxide, carboxymethyl chitosan, a calcium-zinc stabilizer and nano sodium silicate, and the proportion of the four is 2: (1.5-2): (1.25-1.5); 2.
based on the ingredients, the invention also provides a preparation process of the film based on the nano calcium carbonate, which comprises the following steps:
1) the raw materials of the bonding layer are proportioned, dried in a first drying unit and then conveyed to a first heating unit of an extruder by a first conveying device to be heated to a molten state; the base layer raw materials are proportioned, dried in a second drying unit and then conveyed to a second heating unit of the extruder by a second conveying device to be heated to a molten state; the raw materials of the protective layer are proportioned, dried in a third drying unit and then conveyed to a third heating unit of the extruder by a third conveying device to be heated to be molten; a discharge end of the first heating unit is provided with a 430-450-mesh filter screen, a discharge end of the second heating unit is provided with a 440-460-mesh filter screen, and a discharge end of the third heating unit is provided with a 430-450-mesh filter screen; the discharge ends of the first heating unit, the second heating unit and the third heating unit are correspondingly provided with die heads, the die heads are three-layer die heads, melts at the discharge ends of the first heating unit, the second heating unit and the third heating unit are converged and extruded from the three-layer die heads, and the temperature of the die heads is 245-255 ℃;
2) after the melt is extruded from the die head, attaching compressed air to a chilling roller at 15-18 ℃ for chilling to form a cast sheet, then cooling in water bath, and removing water from the cooled cast sheet by using the compressed air;
3) preheating the cast sheet at 125-135 ℃, and longitudinally extending at 115-118 ℃ with the extension ratio of 2.0-3.0; after longitudinal drawing, transversely extending the film, preheating at 150-160 ℃ before transverse drawing, stretching at 140-145 ℃, and performing heat setting at (160 +/-5) DEG C with the stretching ratio of 4.0-6.0 to prepare the film;
4) the film enters a traction device for flattening through air cooling;
5) cutting and packaging to obtain the finished product.
The melt is filtered by a filter screen with 430 meshes to 450 meshes, a filter screen with 440 meshes to 460 meshes and a filter screen with 430 meshes to 450 meshes respectively.
Further preferably, the die temperature in step 1) is (248 ± 1) ° c.
Still preferably, the casting sheet in the step 3) is preheated to 127 +/-1 ℃ and longitudinally extended at 115-118 ℃, and the extension ratio is 2.0-3.0; longitudinally stretching the film, transversely stretching the film after longitudinal stretching, preheating the film at (153 +/-1) DEG C before transverse stretching, stretching the film at (142 +/-1) DEG C, and performing heat setting at the stretching ratio of 4.0-6.0 to prepare the film.
Based on the process, the preparation device of the film based on the nano calcium carbonate comprises an extruder body, wherein the extruder body is sequentially provided with a bonding layer preparation front end part, a base layer preparation front end part and a protection layer preparation front end part from bottom to top, the bonding layer preparation front end part comprises a first drying unit, a first conveying device and a first heating unit which are sequentially arranged, the base layer preparation front end part comprises a second drying unit, a second conveying device and a second heating unit which are sequentially arranged, the protection layer preparation front end part comprises a third drying unit, a third conveying device and a third heating unit which are sequentially arranged, die heads are correspondingly arranged at the discharge ends of the first heating unit, the second heating unit and the third heating unit, the die heads are three die heads, and are formed by surrounding left, right and upper connecting blocks, and a converging extrusion part is positioned at the left side, The cavity position that encloses between the connecting blocks of three groups on the right side, goes up, and spout slider formula seamless connection between three connecting blocks, this spout is binding off the groove.
Referring to the attached drawings, the die head adopts a fine technology, namely, a left connecting block, a right connecting block and an upper connecting block are in parallel butt joint and sliding connection into a whole, and a locking piece (not shown in the figure) is arranged between every two connecting blocks. And referring to the attached drawings, the stress of the converged extrusion part is dispersed to the three groups of connecting blocks, and the extrusion molding effect is ensured. And because adopt spout slider formula seamless connection between three groups of connecting blocks, when overhauing like this, as long as find appear the gap between arbitrary two sets of connecting blocks, just can judge that the die head precision goes wrong, judge promptly that crowded material shaping appears the flaw, it is very convenient.
Furthermore, the discharge ports of the discharge ends of the first heating unit, the second heating unit and the third heating unit are flaring ports, and the flaring ports are concave arc-shaped flaring ports. Thus, the discharging effect is better.
The following two sets of examples:
the first embodiment is as follows: bonding layer: a base layer: the thickness ratio of the protective layer is 2:7: 1; the base layer comprises the following components in parts by weight: 20 parts of nano calcium carbonate, 20 parts of ethylene-butylene copolymer, 5 parts of dimethylacetamide, 2 parts of a cross-linking agent and 2 parts of a modifier; the adhesive layer comprises 20 parts of propylene-butylene copolymer, 5 parts of nano calcium carbonate, 3 parts of monostearin, 3 parts of fatty alcohol polyether amide, 1 part of cross-linking agent and 1 part of modifying agent; the protective layer comprises 20 parts of ethylene-propylene copolymer, 20 parts of homopolymerized polypropylene, 5 parts of nano calcium carbonate, 1 part of cross-linking agent and 1 part of modifying agent. The particle size of the nano calcium carbonate is 0.05 mu m. The cross-linking agent is a mixture of 3:7 of phenyl triethoxysilane and octyl trimethoxysilane, the modifier comprises nano titanium dioxide, carboxymethyl chitosan, a calcium-zinc stabilizer and nano sodium silicate, and the proportion of the four is 2: 1.5: 1.25; 2.
example two: bonding layer: a base layer: the thickness ratio of the protective layer is 2.5:7: 1.5; the base layer comprises the following components in parts by weight: 30 parts of nano calcium carbonate, 30 parts of ethylene-butylene copolymer, 10 parts of dimethylacetamide, 5 parts of a cross-linking agent and 5 parts of a modifying agent; the adhesive layer comprises 30 parts of propylene-butylene copolymer, 10 parts of nano calcium carbonate, 5 parts of monostearin, 5 parts of fatty alcohol polyether amide, 2 parts of cross-linking agent and 2 parts of modifying agent; the protective layer comprises 30 parts of ethylene-propylene copolymer, 30 parts of homopolymerized polypropylene, 10 parts of nano calcium carbonate, 3 parts of cross-linking agent and 3 parts of modifying agent. The particle size of the nano calcium carbonate is 0.01 mu m. The cross-linking agent is octyl trimethoxy silane, the modifier comprises nano titanium dioxide, carboxymethyl chitosan, a calcium-zinc stabilizer and nano sodium silicate, and the four components are sequentially in a proportion of 4: 4: 3; 4.
both of the above embodiments employ: step 1), the die head temperature is (248 +/-1) DEG C; step 2), after the melt is extruded from the die head, attaching compressed air to a chilling roller at the temperature of 15-18 ℃ for chilling to form a casting sheet, then cooling in a water bath, and removing water from the cooled casting sheet by using the compressed air; preheating the cast piece at 127 +/-1) DEG C, and longitudinally extending at 115-118 ℃ with the extension ratio of 2.0-3.0; after longitudinal drawing, the film is transversely stretched, before transverse drawing, the film is preheated at (153 +/-1) DEG C, and is stretched at (142 +/-1) DEG C, and the film is subjected to heat setting at (160 +/-5) DEG C, wherein the stretching ratio is 4.0-6.0, so that the film is prepared.
The finished product index (according to the standard 35 μm) is as follows:
the invention provides a film based on nano calcium carbonate and a preparation process and a preparation device thereof, the obtained film has high quality, good flexibility and high tensile strength, and the device designed by the application is adopted to prepare the film, so that the forming is stable and smooth, the production quality is high, and the qualified yield is high.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides a membrane based on nanometer calcium carbonate which characterized in that, includes the basic unit, the inside and outside branch of basic unit is equipped with adhesive linkage and inoxidizing coating, the adhesive linkage: a base layer: the thickness ratio of the protective layer is (2-2.5) to (7) (1-1.5); the base layer comprises the following components in parts by weight: 20-30 parts of nano calcium carbonate, 20-30 parts of ethylene-butylene copolymer, 5-10 parts of dimethylacetamide, 2-5 parts of a cross-linking agent and 2-5 parts of a modifier; the adhesive layer comprises 20-30 parts of propylene-butylene copolymer, 5-10 parts of nano calcium carbonate, 3-5 parts of monostearin, 3-5 parts of fatty alcohol polyether amide, 1-2 parts of cross-linking agent and 1-2 parts of modifying agent; the protective layer comprises 20-30 parts of ethylene-propylene copolymer, 20-30 parts of homopolymerized polypropylene, 5-10 parts of nano calcium carbonate, 1-3 parts of cross-linking agent and 1-3 parts of modifying agent.
2. The nano-calcium carbonate-based film according to claim 1, wherein: the particle size of the nano calcium carbonate is 0.01-0.05 μm.
3. The nano-calcium carbonate-based film according to claim 1 or 2, wherein: the cross-linking agent is one or two of phenyl triethoxysilane and octyl trimethoxysilane, the modifier comprises nano titanium dioxide, carboxymethyl chitosan, a calcium-zinc stabilizer and nano sodium silicate, and the proportion of the four is 2: (1.5-2): (1.25-1.5); 2.
4. a preparation process of a film based on nano calcium carbonate is characterized by comprising the following steps:
1) the raw materials of the bonding layer are proportioned, dried in a first drying unit and then conveyed to a first heating unit of an extruder by a first conveying device to be heated to a molten state; the base layer raw materials are proportioned, dried in a second drying unit and then conveyed to a second heating unit of the extruder by a second conveying device to be heated to a molten state; the raw materials of the protective layer are proportioned, dried in a third drying unit and then conveyed to a third heating unit of the extruder by a third conveying device to be heated to be molten; a discharge end of the first heating unit is provided with a 430-450-mesh filter screen, a discharge end of the second heating unit is provided with a 440-460-mesh filter screen, and a discharge end of the third heating unit is provided with a 430-450-mesh filter screen; the discharge ends of the first heating unit, the second heating unit and the third heating unit are correspondingly provided with die heads, the die heads are three-layer die heads, melts at the discharge ends of the first heating unit, the second heating unit and the third heating unit are converged and extruded from the three-layer die heads, and the temperature of the die heads is 245-255 ℃;
2) after the melt is extruded from the die head, attaching compressed air to a chilling roller at 15-18 ℃ for chilling to form a cast sheet, then cooling in water bath, and removing water from the cooled cast sheet by using the compressed air;
3) preheating the cast sheet at 125-135 ℃, and longitudinally extending at 115-118 ℃ with the extension ratio of 2.0-3.0; after longitudinal drawing, transversely extending the film, preheating at 150-160 ℃ before transverse drawing, stretching at 140-145 ℃, and performing heat setting at (160 +/-5) DEG C with the stretching ratio of 4.0-6.0 to prepare the film;
4) the film enters a traction device for flattening through air cooling;
5) cutting and packaging to obtain the finished product.
5. The process for preparing a nano calcium carbonate-based film according to claim 4, wherein the process comprises the following steps: the temperature of the die head in the step 1) is (248 +/-1) DEG C.
6. The process for preparing a nano calcium carbonate-based film according to claim 4 or 5, wherein: preheating the cast sheet at 127 +/-1) DEG C in the step 3), and longitudinally extending at 115-118 ℃ with the extension ratio of 2.0-3.0; longitudinally stretching the film, transversely stretching the film after longitudinal stretching, preheating the film at (153 +/-1) DEG C before transverse stretching, stretching the film at (142 +/-1) DEG C, and performing heat setting at the stretching ratio of 4.0-6.0 to prepare the film.
7. The utility model provides a preparation facilities of membrane based on nanometer calcium carbonate, includes the extruder body, the extruder body sets gradually tip before tip, basic unit preparation and tip before inoxidizing coating preparation from bottom to top, the preceding tip of adhesive layer preparation including the first drying unit, first conveyor, the first heating unit that set gradually, basic unit preparation before the tip including the second drying unit, second conveyor, the second heating unit that set gradually, inoxidizing coating preparation before the tip including the third drying unit, third conveyor, the third heating unit that set gradually, first, second, third heating unit's discharge end corresponds and sets up the die head, the die head be three-layer die head, its characterized in that: the three-layer die head comprises a left group of connecting blocks, a right group of connecting blocks and an upper group of connecting blocks, wherein the three-layer die head is formed by enclosing, the converging extrusion part is positioned at a cavity part enclosed among the left group of connecting blocks, the right group of connecting blocks and the upper group of connecting blocks, the three groups of connecting blocks are in sliding block type seamless connection with each other through sliding grooves, and the sliding grooves are closing grooves.
8. The apparatus for preparing nano calcium carbonate-based film according to claim 6, wherein: the discharge ports of the discharge ends of the first heating unit, the second heating unit and the third heating unit are flaring ports, and the flaring ports are concave arc-shaped flaring ports.
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| JP2001310384A (en) * | 2000-04-28 | 2001-11-06 | Nan Ya Plast Corp | Method for producing heat-sealable/non-heat-sealable biaxially oriented polypropylene films applicable to water base ink printing and metallizing treatment such as vacuum plating, and product produced thereby |
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