CN115214214A - Stretch-resistant biaxially oriented polyamide film and preparation method thereof - Google Patents
Stretch-resistant biaxially oriented polyamide film and preparation method thereof Download PDFInfo
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- CN115214214A CN115214214A CN202210731974.1A CN202210731974A CN115214214A CN 115214214 A CN115214214 A CN 115214214A CN 202210731974 A CN202210731974 A CN 202210731974A CN 115214214 A CN115214214 A CN 115214214A
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- 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
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
- 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
- C08K5/00—Use of organic ingredients
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a stretch-resistant biaxially oriented polyamide film which comprises a first stretch-resistant layer, a polyamide layer and a second stretch-resistant layer, wherein the polyamide layer is arranged between the first stretch-resistant layer and the second stretch-resistant layer. The invention also discloses a preparation method of the stretch-resistant biaxially oriented polyamide film, which comprises the following steps: s1: drying the raw materials; s2: melting, plasticizing and extruding; s3: forming a slab on the cold roll; s4: preheating the thick sheet; s5: stretching to form a film; s6: heat setting, cooling and corona treatment; s7: and cutting according to requirements. The polyamide film is formed by a three-layer structure, the stretch-resistant additive is added into the stretch-resistant layers of the upper layer and the lower layer, so that the stretch-resistant performance of the polyamide film can be greatly enhanced, the stretch-resistant strength of all parts of the whole polyamide film is the same, the stretch-resistant performance of the polyamide film can be obviously enhanced when the polyamide film is used, and the application range of the polyamide film is improved.
Description
Technical Field
The invention relates to the technical field of polyamide films, in particular to a stretch-resistant biaxially oriented polyamide film and a preparation method thereof.
Background
The polyamide is a polymer having amide (-NH-CO-) repeat structural units in the polymer chain, and the polyamide having an aliphatic group as a main chain is called nylon. According to the internationally prevailing standards, polyamides are usually abbreviated to PA.
The nylon 6 has a structure simply represented by
Is obtained by ring-opening polymerization of caprolactam. The hydrolysis polymerization reaction of caprolactam comprises four basic reactions of ring opening, addition, condensation and chain exchange, and the reaction formula is as follows:
(1) Hydrolysis
(2) Condensation polymerization
(3) Addition polymerization
(4) Chain switching
Nylon 6 belongs to linear macromolecules, the molecular chain skeleton consists of a-C-N-chain, has good flexibility and is a typical thermoplastic polymer. Stronger polar amide groups are regularly and alternately arranged on a molecular chain, and the molecular chain is regular and has stronger crystallization capacity. Polar amide groups can form hydrogen bonds between molecular chains, because hydrogen atoms connected with nitrogen atoms in the amide groups on one molecular chain are proton donators, oxygen atoms connected with carbon atoms in the amide groups on the other molecular chain are proton acceptors, and the two are mutually attracted to form the hydrogen bonds. The formation of hydrogen bonds increases the acting force among molecular chains, further enhances the crystallization capacity of the polymer, and simultaneously raises the melting point of the polymer, and on the other hand, the flexibility of the molecular chains endows the nylon 6 with good toughness.
The existing biaxial stretching polyamide film has the defect of low tensile strength, and can not well meet the existing packaging requirements, therefore, the tensile biaxial stretching polyamide film and the preparation method thereof are provided to solve the existing problems
Disclosure of Invention
The invention aims to provide a stretch-resistant biaxially oriented polyamide film and a preparation method thereof, the stretch-resistant biaxially oriented polyamide film is formed by a three-layer structure, stretch-resistant additives are added into upper and lower stretch-resistant layers, so that the stretch-resistant performance of the film can be greatly enhanced, the stretch-resistant strength of the whole film is the same, the stretch-resistant performance of the polyamide film can be obviously enhanced when the film is used, the application range of the film is improved, and the problems in the background art are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
a stretch resistant biaxially oriented polyamide film comprising a first stretch resistant layer, a polyamide layer and a second stretch resistant layer, the polyamide layer being disposed between the first stretch resistant layer and the second stretch resistant layer.
In a preferred embodiment of the stretch-resistant biaxially oriented polyamide film according to the invention, the first stretch-resistant layer and the second stretch-resistant layer are both composed of a polyamide layer and a stretch-resistant additive.
Preferably, as a stretch-resistant biaxially oriented polyamide film of the present invention, the overall thickness of the stretch-resistant biaxially oriented polyamide film is 10 to 20 μm, and the thickness of the first stretch-resistant layer and the second stretch-resistant layer is the same.
A preparation method of a stretch-resistant biaxially oriented polyamide film comprises the following steps:
s1: drying all the raw materials, and controlling the moisture content of the raw materials;
s2: mixing the raw materials of the first stretch-resistant layer, the polyamide layer and the second stretch-resistant layer according to a formula ratio, uniformly dispersing the raw materials by a high-speed stirrer, melting, plasticizing and extruding the raw materials by respective extruders, and allowing the mixture to flow out of a melt through a coat-hanger type die head;
s3: attaching the melt to a cold roller by using a low-pressure air knife to form a thick sheet with a certain thickness;
s4: preheating the thick sheet by a roller;
s5: forming a thin film by longitudinally stretching and transversely stretching the preheated thick sheet;
s6: carrying out heat setting treatment on the stretched film, and then carrying out cooling and corona treatment and rolling after the heat setting treatment is finished to obtain a stretch-resistant biaxially oriented polyamide film;
s7: and cutting the rolled stretch-resistant biaxially-oriented polyamide film according to requirements.
In the method for producing the stretch-resistant biaxially oriented polyamide film of the present invention, it is preferable that all the raw materials in S1 are dried by heating, and the moisture content of the raw materials is controlled to 800ppm or less.
In a preferred method for producing a stretch-resistant biaxially oriented polyamide film according to the invention, the temperature of the extruder in S2 is 240 to 260 ℃.
As a preferable preparation method of the stretch-resistant two-way stretching polyamide film, the thickness of the thick sheet in S3 is 100-140 mu m, and the temperature of the cold roll is 10-30 ℃.
As a preferred method for preparing the stretch-resistant biaxially oriented polyamide film of the present invention, the temperature of the roller in S4 is 50 to 60 ℃.
Preferably, in the preparation method of the stretch-resistant biaxially oriented polyamide film, the stretching temperature in the S5 is 60-99 ℃; the draw ratio was 1.60 x 1.64-1.64 x 1.68.
Preferably, in the preparation method of the stretch-resistant biaxially oriented polyamide film, the setting temperature of the heat setting treatment in S6 is 200-240 ℃, and the setting time is 8-12S; the power of the corona treatment is 6-10W.
Compared with the prior art, the invention has the beneficial effects that:
the polyamide film is formed by a three-layer structure, the stretch-resistant additive is added into the stretch-resistant layers of the upper layer and the lower layer, so that the stretch-resistant performance of the polyamide film can be greatly enhanced, the stretch-resistant strength of all parts of the whole polyamide film is the same, the stretch-resistant performance of the polyamide film can be obviously enhanced when the polyamide film is used, and the application range of the polyamide film is improved.
Drawings
FIG. 1 is a schematic structural view of a stretch resistant biaxially oriented polyamide film of the present invention;
fig. 2 is a schematic flow chart of a method for preparing the stretch-resistant biaxially oriented polyamide film according to the present invention.
In the figure: 1. a first tensile layer; 2. a polyamide layer; 3. a second tensile layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A stretch-resistant biaxially oriented polyamide film having an overall thickness of 10 μm, comprising a first stretch-resistant layer 1, a polyamide layer 2 and a second stretch-resistant layer 3, the polyamide layer 2 being disposed between the first stretch-resistant layer 1 and the second stretch-resistant layer 3, the first stretch-resistant layer 1 and the second stretch-resistant layer 3 having the same thickness, the first stretch-resistant layer 1 and the second stretch-resistant layer 3 each being composed of a polyamide layer 2 and a stretch-resistant additive.
A preparation method of a stretch-resistant biaxially oriented polyamide film comprises the following steps:
s1: drying all raw materials by a heating method, controlling the moisture content of the raw materials to be below 800ppm, and fully crystallizing the polyamide except reducing the moisture content in the drying process;
s2: mixing the raw materials of the first stretch-resistant layer 1, the polyamide layer 2 and the second stretch-resistant layer 3 according to a formula ratio, uniformly dispersing the raw materials by a high-speed stirrer, melting, plasticizing and extruding the raw materials at 240 ℃ by respective extruders, and allowing the raw materials to flow out of a melt through a coat-hanger type die head;
s3: attaching the melt to a cold roll with the temperature of 10 ℃ by adopting a low-pressure air knife to form a thick sheet with the thickness of 100 mu m;
s4: preheating the thick sheet by a roller with the temperature of 50 ℃;
s5: longitudinally stretching and transversely stretching the preheated thick sheet to form a film, wherein the stretching temperature is 60 ℃; draw ratio 1.60 x 1.64;
s6: carrying out heat setting treatment on the stretched film, wherein the setting temperature is 200 ℃, the setting time is s, cooling and corona treatment are carried out after the heat setting treatment is finished, the corona treatment power is 6W, and the stretched biaxially oriented polyamide film is obtained by rolling;
s7: and cutting the rolled stretch-resistant biaxially-oriented polyamide film according to requirements.
Example 2
A stretch-resistant biaxially oriented polyamide film, the overall thickness of the stretch-resistant biaxially oriented polyamide film being 15 μm, comprising a first stretch-resistant layer 1, a polyamide layer 2 and a second stretch-resistant layer 3, the polyamide layer 2 being disposed between the first stretch-resistant layer 1 and the second stretch-resistant layer 3, the thicknesses of the first stretch-resistant layer 1 and the second stretch-resistant layer 3 being the same, and both the first stretch-resistant layer 1 and the second stretch-resistant layer 3 being composed of the polyamide layer 2 and a stretch-resistant additive.
A preparation method of a stretch-resistant biaxially oriented polyamide film comprises the following steps:
s1: all raw materials are dried by a heating method, the moisture content of the raw materials is controlled to be below 800ppm, and for polyamide, the drying process can also fully crystallize besides reducing the moisture content;
s2: the raw materials of the first stretch-resistant layer 1, the polyamide layer 2 and the second stretch-resistant layer 3 are respectively mixed according to the proportion of a formula, are uniformly dispersed by a high-speed stirrer, are melted, plasticized and extruded at the temperature of 250 ℃ by respective extruders, and flow out of a melt through a coat-hanger type die head;
s3: attaching the melt to a cold roll with the temperature of 20 ℃ by adopting a low-pressure air knife to form a thick sheet with the thickness of 120 mu m;
s4: preheating the thick sheet by a roller with the temperature of 55 ℃;
s5: longitudinally stretching and transversely stretching the preheated thick sheet to form a film, wherein the stretching temperature is 80 ℃; draw ratio 1.62 x 1.66;
s6: carrying out heat setting treatment on the stretched film, wherein the setting temperature is 220 ℃, the setting time is 10s, cooling and corona treatment are carried out after the heat setting treatment is finished, the corona treatment power is 8W, and the stretched biaxially oriented polyamide film is obtained by rolling;
s7: and cutting the rolled stretch-resistant biaxially-oriented polyamide film according to requirements.
Example 3
A stretch-resistant biaxially oriented polyamide film, the overall thickness of the stretch-resistant biaxially oriented polyamide film being 20 μm, comprising a first stretch-resistant layer 1, a polyamide layer 2 and a second stretch-resistant layer 3, the polyamide layer 2 being disposed between the first stretch-resistant layer 1 and the second stretch-resistant layer 3, the thicknesses of the first stretch-resistant layer 1 and the second stretch-resistant layer 3 being the same, and both the first stretch-resistant layer 1 and the second stretch-resistant layer 3 being composed of the polyamide layer 2 and a stretch-resistant additive.
A preparation method of a stretch-resistant biaxially oriented polyamide film comprises the following steps:
s1: drying all raw materials by a heating method, controlling the moisture content of the raw materials to be below 800ppm, and fully crystallizing the polyamide except reducing the moisture content in the drying process;
s2: mixing the raw materials of the first stretch-resistant layer 1, the polyamide layer 2 and the second stretch-resistant layer 3 according to a formula ratio, uniformly dispersing the raw materials by a high-speed stirrer, melting, plasticizing and extruding the raw materials by respective extruders at 260 ℃, and enabling the raw materials to flow out of a melt through a coat-hanger type die head;
s3: attaching the melt to a cold roll with the temperature of 30 ℃ by adopting a low-pressure air knife to form a thick sheet with the thickness of 140 mu m;
s4: preheating the thick sheet by a roller with the temperature of 60 ℃;
s5: longitudinally stretching and transversely stretching the preheated thick sheet to form a film, wherein the stretching temperature is 99 ℃; draw ratio of 1.64 x 1.68;
s6: carrying out heat setting treatment on the stretched film, wherein the setting temperature is 240 ℃, the setting time is 12s, cooling and corona treatment are carried out after the heat setting treatment is finished, the corona treatment power is 10W, and the stretched biaxially oriented polyamide film is obtained by rolling;
s7: and cutting the rolled stretch-resistant biaxially-oriented polyamide film according to requirements.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A stretch-resistant biaxially oriented polyamide film characterized by: comprising a first stretch resistant layer, a polyamide layer and a second stretch resistant layer, the polyamide layer being disposed between the first stretch resistant layer and the second stretch resistant layer.
2. A stretch resistant biaxially oriented polyamide film according to claim 1, wherein: the first tensile layer and the second tensile layer are both composed of a polyamide layer and a tensile additive.
3. A stretch-resistant biaxially oriented polyamide film according to claim 1, wherein: the whole thickness of the stretch-resistant two-way stretching polyamide film is 10-20 mu m, and the thickness of the first stretch-resistant layer is the same as that of the second stretch-resistant layer.
4. A method for the production of a stretch-resistant biaxially oriented polyamide film according to any of claims 1 to 3, characterized in that it comprises the following steps:
s1: drying all the raw materials, and controlling the moisture content of the raw materials;
s2: mixing the raw materials of the first stretch-resistant layer, the polyamide layer and the second stretch-resistant layer according to a formula ratio, uniformly dispersing the raw materials by a high-speed stirrer, melting, plasticizing and extruding the raw materials by respective extruders, and allowing the mixture to flow out of a melt through a coat-hanger type die head;
s3: attaching the melt to a cold roller by using a low-pressure air knife to form a thick sheet with a certain thickness;
s4: preheating the thick sheet through a roller;
s5: longitudinally stretching and transversely stretching the preheated thick sheet to form a film;
s6: carrying out heat setting treatment on the stretched film, and then carrying out cooling and corona treatment and rolling after the heat setting treatment is finished to obtain the stretch-resistant biaxially oriented polyamide film;
s7: and cutting the rolled stretch-resistant biaxially-oriented polyamide film according to requirements.
5. The method for preparing the stretch-resistant biaxially oriented polyamide film according to claim 4, wherein the method comprises the following steps: in the step S1, all raw materials are dried by adopting a heating method, and the moisture content of the raw materials is controlled to be below 800 ppm.
6. The method of claim 4, wherein the method comprises the steps of: the temperature of the extruder in the S2 is 240-260 ℃.
7. The method for preparing the stretch-resistant biaxially oriented polyamide film according to claim 4, wherein the method comprises the following steps: the thickness of the thick sheet in the S3 is 100-140 mu m, and the temperature of the cold roll is 10-30 ℃.
8. The method for preparing the stretch-resistant biaxially oriented polyamide film according to claim 4, wherein the method comprises the following steps: the temperature of the roller in the S4 is 50-60 ℃.
9. The method for preparing the stretch-resistant biaxially oriented polyamide film according to claim 4, wherein the method comprises the following steps: the stretching temperature in the S5 is 60-99 ℃; the draw ratio was 1.60 x 1.64-1.64 x 1.68.
10. The method of claim 4, wherein the method comprises the steps of: the setting temperature of the heat setting treatment in the S6 is 200-240 ℃, and the setting time is 8-12S; the corona treatment power is 6-10W.
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| CN202210731974.1A CN115214214A (en) | 2022-06-27 | 2022-06-27 | Stretch-resistant biaxially oriented polyamide film and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002103446A (en) * | 2000-09-29 | 2002-04-09 | Toyobo Co Ltd | Method for producing biaxially oriented polyamide film, biaxially oriented polyamide film by the method, and laminated film using the polyamide film |
| JP2003011307A (en) * | 2001-06-29 | 2003-01-15 | Toyobo Co Ltd | Laminated biaxially oriented polyamide film |
| CN106739365A (en) * | 2016-12-06 | 2017-05-31 | 厦门长塑实业有限公司 | One kind can laser marking two-way stretching polyamide film and preparation method thereof |
| CN111132832A (en) * | 2017-09-28 | 2020-05-08 | 东洋纺株式会社 | Laminated stretched polyamide film |
| CN113878962A (en) * | 2021-09-16 | 2022-01-04 | 厦门长塑实业有限公司 | Enhanced biaxially oriented polyamide film and preparation method and application thereof |
-
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- 2022-06-27 CN CN202210731974.1A patent/CN115214214A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002103446A (en) * | 2000-09-29 | 2002-04-09 | Toyobo Co Ltd | Method for producing biaxially oriented polyamide film, biaxially oriented polyamide film by the method, and laminated film using the polyamide film |
| JP2003011307A (en) * | 2001-06-29 | 2003-01-15 | Toyobo Co Ltd | Laminated biaxially oriented polyamide film |
| CN106739365A (en) * | 2016-12-06 | 2017-05-31 | 厦门长塑实业有限公司 | One kind can laser marking two-way stretching polyamide film and preparation method thereof |
| CN111132832A (en) * | 2017-09-28 | 2020-05-08 | 东洋纺株式会社 | Laminated stretched polyamide film |
| CN113878962A (en) * | 2021-09-16 | 2022-01-04 | 厦门长塑实业有限公司 | Enhanced biaxially oriented polyamide film and preparation method and application thereof |
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| 赵素合等: "《建筑装饰材料工艺》", 大连：大连理工大学出版社, pages: 203 - 207 * |
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