CN108215422B - TPU (thermoplastic polyurethane) film with high waterproofness for sealing electronic component and preparation method thereof - Google Patents

TPU (thermoplastic polyurethane) film with high waterproofness for sealing electronic component and preparation method thereof Download PDF

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CN108215422B
CN108215422B CN201711394026.9A CN201711394026A CN108215422B CN 108215422 B CN108215422 B CN 108215422B CN 201711394026 A CN201711394026 A CN 201711394026A CN 108215422 B CN108215422 B CN 108215422B
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surface layer
layer
tpu film
film
tpu
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CN108215422A (en
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杨博
何建雄
王一良
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SUZHOU XIONGLIN NEW MATERIAL SCIENCE & TECHNOLOGY CO.,LTD.
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Dongguan Xionglin New Materials Technology Co Ltd
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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
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • 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
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • C08L75/06—Polyurethanes from polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • C08L75/08—Polyurethanes from polyethers
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B29L2007/00—Flat articles, e.g. films or sheets
    • 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
    • B29L2009/00—Layered products
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • 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
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • 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
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • 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
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic
    • 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

Abstract

The invention provides a TPU film with high waterproofness for sealing an electronic component and a preparation method thereof. The TPU film comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially laminated; the inner surface layer comprises a polyether polyurethane elastomer, a polyolefin elastomer and polyamide; the intermediate layer comprises a polyester polyurethane elastomer, an ethylene-vinyl alcohol copolymer and polycarbonate; the outer skin layer comprises a polyether polyurethane elastomer and polytetrafluoroethylene. The TPU film is prepared by firstly forming a base film after melting and casting through a three-layer co-extrusion casting machine, and then carrying out biaxial stretching and shaping. The TPU film provided by the invention has higher waterproof and oxygen-insulating performance and puncture resistance, particularly has outstanding waterproof performance, and can be used as a sealing film of an electronic component.

Description

TPU (thermoplastic polyurethane) film with high waterproofness for sealing electronic component and preparation method thereof
Technical Field
The invention belongs to the technical field of polymer film materials, particularly relates to a TPU film for sealing electronic components and a preparation method thereof, and particularly relates to a TPU film with high waterproofness for sealing electronic components and a preparation method thereof.
Background
Thermoplastic polyurethane elastomers (TPU) are a class of high polymers prepared from oligomer polyols, polyisocyanates and chain extenders as the main raw materials, and can be divided into polyether TPUs, which have higher water resistance but lower strength, and polyester TPUs, which have high strength but are not resistant to hydrolysis. The TPU has the advantages of excellent wear resistance, high tensile strength and elongation, low compression set, high tearing strength, environmental and chemical corrosion resistance, low-temperature flexibility, wide hardness range and large bearing capacity, and is widely applied to the fields of automobile body external accessories, cable sheaths, adhesive tapes, ski shoes, gears, rubber tubes, packaging bags, sealing films and the like.
The TPU has certain hygroscopicity because molecular chains contain a large number of carbamate groups, and has good practicability when being used in occasions with low requirements on waterproof and water-blocking performances, such as clothing fabrics, textiles, food packaging and the like. However, when it is used for sealing electronic components, it is difficult to suppress deterioration of the electronic components due to insufficient water blocking; moreover, electronic components often have irregular shapes, and can puncture a sealing film to cause gas leakage, so that the puncture resistance of the TPU film is also higher. The barrier performance of the existing TPU film is improved by adding a layered inorganic material, but the puncture resistance and the sealing performance of the film are greatly reduced.
Therefore, it is desirable in the art to obtain a TPU film with good waterproof and puncture-resistant properties to meet the sealing requirements of electronic components.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a TPU film for sealing electronic components and a preparation method thereof, and particularly provides a TPU film for sealing electronic components with high waterproofness and a preparation method thereof. The TPU film has high waterproof and oxygen-insulating performance and puncture resistance, particularly has outstanding waterproof performance, and can be used for sealing electronic components.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a TPU film for sealing an electronic component, which comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially laminated;
the inner skin layer comprises a polyether polyurethane elastomer, a polyolefin elastomer and Polyamide (PA);
the intermediate layer comprises a polyester polyurethane elastomer, ethylene vinyl alcohol copolymer (EVOH), and Polycarbonate (PC);
the outer skin layer includes a polyether polyurethane elastomer and Polytetrafluoroethylene (PTFE).
The inner surface layer is matched with the polyether polyurethane elastomer, the polyolefin elastomer and the polyamide to obtain good bonding sealing performance and puncture resistance, so that the air leakage phenomenon is prevented; the middle layer is made of polyester polyurethane elastomer, EVOH and PC which are matched, so that good stiffness, water resistance and oxygen insulation performance are mainly provided; the outer surface layer is directly contacted with the external environment, and the polyether polyurethane elastomer and the PTFE are matched to mainly provide good waterproof and wear-resisting properties. According to the invention, the three layers are mutually matched, so that the obtained TPU film has higher waterproof and oxygen-insulating properties and puncture resistance.
As a preferred embodiment of the present invention, the inner skin layer is composed of 40 to 60 wt% (e.g., 40 wt%, 41 wt%, 42 wt%, 43 wt%, 44 wt%, 45 wt%, 46 wt%, 47 wt%, 48 wt%, 49 wt%, 50 wt%, 51 wt%, 52 wt%, 53 wt%, 54 wt%, 55 wt%, 56 wt%, 57 wt%, 58 wt%, 59 wt%, or 60 wt%, etc.) of a polyether polyurethane elastomer, 15 to 40 wt.% (e.g., 15 wt.%, 16 wt.%, 18 wt.%, 20 wt.%, 22 wt.%, 23 wt.%, 25 wt.%, 26 wt.%, 28 wt.%, 30 wt.%, 32 wt.%, 33 wt.%, 35 wt.%, 36 wt.%, 38 wt.%, or 40 wt.%, etc.) of a polyolefin elastomer and 20 to 30 wt.% (e.g., 20 wt.%, 21 wt.%, 22 wt.%, 23 wt.%, 24 wt.%, 25 wt.%, 26 wt.%, 27 wt.%, 28 wt.%, 29 wt.%, or 30 wt.%, etc.) of a polyamide.
Preferably, the inner skin layer is composed of 50 wt% of polyether urethane elastomer, 30 wt% of polyolefin elastomer, and 20 wt% of polyamide.
As a preferred embodiment of the present invention, the intermediate layer is composed of 20 to 40 wt% (e.g., 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34 wt%, 35 wt%, 36 wt%, 37 wt%, 38 wt%, 39 wt%, or 40 wt%, etc.) of a polyester-type polyurethane elastomer, 20 to 30 wt% (e.g., 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, or 30 wt%, etc.) of an ethylene-vinyl alcohol copolymer, and 35 to 50 wt% (e.g., 35 wt%, 36 wt%, 37 wt%, 38 wt%, 39 wt%, 40 wt%, 41 wt%, 42 wt%, 43 wt%, 44 wt%, 45 wt%, 46 wt%, 47 wt%, 48 wt%), of an ethylene-vinyl alcohol copolymer, and 35 to 50 wt% (e.g., 35 wt%, 36 wt%, 37 wt%, 38 wt%, 39 wt%, 40, 49 wt% or 50 wt%, etc.).
Preferably, the intermediate layer is composed of 30 wt% of the polyester polyurethane elastomer, 30 wt% of the ethylene-vinyl alcohol copolymer, and 40 wt% of the polycarbonate.
As a preferred embodiment of the present invention, the outer skin layer is composed of 40 to 60 wt% (e.g., 40 wt%, 41 wt%, 42 wt%, 43 wt%, 44 wt%, 45 wt%, 46 wt%, 47 wt%, 48 wt%, 49 wt%, 50 wt%, 51 wt%, 52 wt%, 53 wt%, 54 wt%, 55 wt%, 56 wt%, 57 wt%, 58 wt%, 59 wt%, or 60 wt%, etc.) of a polyether polyurethane elastomer and 40 to 60 wt% (e.g., 40 wt%, 41 wt%, 42 wt%, 43 wt%, 44 wt%, 45 wt%, 46 wt%, 47 wt%, 48 wt%, 49 wt%, 50 wt%, 51 wt%, 52 wt%, 53 wt%, 54 wt%, 55 wt%, 56 wt%, 57 wt%, 58 wt%, 59 wt%, or 60 wt%, etc.) of polytetrafluoroethylene.
Preferably, the outer skin layer consists of 50 wt% of the polyether polyurethane elastomer and 50 wt% of polytetrafluoroethylene.
As a preferred technical scheme of the invention, the thickness ratio among the inner surface layer, the middle layer and the outer surface layer is (1-3) to (4-8) to (1-3); for example, 1:8:1, 1:7:2, 1:6:3, 2:7:1, 2:6:2, 2:5:3, 3:6:1, 3:5:2, or 3:4: 3.
Preferably, the thickness of the TPU thin film is 20-100 μm; for example, it may be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm or 100 μm.
In a preferred embodiment of the present invention, the polyolefin elastomer is an ethylene octene elastomer (POE).
Preferably, the polyamide is selected from one or a combination of at least two of polycaprolactam (PA6), polydecamediacyl decamethylene diamine (PA1010) or polycaproyl meta dimethyl amine (MKD 6); typical but non-limiting examples of such combinations are: PA6 in combination with PA1010, PA6 in combination with MKD6, PA1010 in combination with MKD6, and the like. More preferably, the polyamide of the invention is MKD 6.
As a preferable technical scheme of the invention, the molar content of the vinyl alcohol unit in the ethylene-vinyl alcohol copolymer is 50-60%; for example, it may be 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, or the like.
In another aspect, the present invention provides a method for preparing the TPU film, comprising the steps of:
(1) according to the formula, respectively melting and extruding the components of the inner surface layer, the middle layer and the outer surface layer through three channels of a three-layer co-extrusion casting machine, and then casting to form a base film;
(2) and (2) biaxially stretching the base film obtained in the step (1), and then heating and shaping to obtain the TPU film for sealing the electronic component.
As a preferred embodiment of the present invention, the melt extrusion temperature in step (1) is: the inner surface layer is 160 ℃ and 200 ℃, for example, 160 ℃, 162 ℃, 165 ℃, 168 ℃, 170 ℃, 172 ℃, 175 ℃, 178 ℃, 180 ℃, 182 ℃, 185 ℃, 188 ℃, 190 ℃, 192 ℃, 195 ℃, 198 ℃ or 200 ℃ and the like; the intermediate layer 180 ℃220 ℃ can be, for example, 180 ℃, 182 ℃, 185 ℃, 188 ℃, 190 ℃, 192 ℃, 195 ℃, 198 ℃, 200 ℃, 202 ℃, 205 ℃, 208 ℃, 210 ℃, 212 ℃, 215 ℃, 218 ℃ or 220 ℃; the outer surface layer is 250 ℃ to 300 ℃, and may be, for example, 250 ℃, 252 ℃, 255 ℃, 258 ℃, 260 ℃, 262 ℃, 265 ℃, 268 ℃, 270 ℃, 272 ℃, 275 ℃, 278 ℃, 280 ℃, 282 ℃, 285 ℃, 288 ℃, 290 ℃, 292 ℃, 295 ℃, 298 ℃, or 300 ℃.
Preferably, the processing temperature of the biaxial stretching in the step (2) is 85-100 ℃; 85 ℃, 86 ℃, 87 ℃, 88 ℃, 89 ℃, 90 ℃, 91 ℃, 92 ℃, 93 ℃, 94 ℃, 95 ℃, 96 ℃, 97 ℃, 98 ℃, 99 ℃ or 100 ℃ and the like.
Preferably, the stretching rate of the biaxial stretching in the step (2) is 5 to 10 m/min; for example, it may be 5m/min, 6m/min, 7m/min, 8m/min, 9m/min, or 10 m/min.
Preferably, the stretching times of the two-way stretch in the step (2) are the same and are 3-8 times; for example, the amount may be 3 times, 3.5 times, 4 times, 4.5 times, 5 times, 5.5 times, 6 times, 6.5 times, 7 times, 7.5 times, 8 times, or the like.
Preferably, the temperature for heat setting in step (2) is 180-; the setting time is 5-10min, such as 5min, 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, 8.5min, 9min, 9.5min or 10 min.
As a preferred technical scheme of the invention, the preparation method comprises the following steps:
(1) according to the formula, the components of the inner surface layer, the middle layer and the outer surface layer are respectively melted and extruded through three channels of a three-layer co-extrusion casting machine, wherein the melting and extrusion temperature is as follows: the inner surface layer is 160-200 ℃, the middle layer is 180-220 ℃, and the outer surface layer is 250-300 ℃ and then the base film is formed by tape casting;
(2) and (2) biaxially stretching the base film obtained in the step (1) at the stretching speed of 5-10m/min at the temperature of 85-100 ℃, wherein the transverse and longitudinal stretching times are 3-8 times, and then heating and shaping at the temperature of 180-200 ℃ for 5-10min to obtain the TPU film for sealing the electronic component.
Compared with the prior art, the invention has the following beneficial effects:
the invention reasonably matches the components of the inner surface layer, the middle layer and the outer surface layer,the obtained TPU film has higher waterproof and oxygen-insulating performance and puncture resistance. The water vapor transmission rate is 0.008-0.02g/m224h, oxygen transmission rate of 15-33cm3/m224h, the puncture resistance strength is 23-30N, and the sealing film can be used as a sealing film of an electronic component.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The EVOH used in the following examples and comparative examples each had a vinyl alcohol unit molar content of 60%.
Example 1
A TPU film for sealing electronic components comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially laminated;
wherein the inner surface layer consists of 40 wt% of polyether polyurethane elastomer, 40 wt% of POE and 20 wt% of PA6, and the thickness is 2 μm;
the intermediate layer consists of 40 wt% of polyester polyurethane elastomer, 25 wt% of EVOH and 35 wt% of PC, and the thickness is 16 μm;
the outer skin layer was composed of 60 wt% of polyether urethane elastomer and 40 wt% of PTFE, and had a thickness of 2 μm.
The preparation method of the TPU film comprises the following steps:
(1) according to the formula, respectively melting and extruding the components of the inner surface layer, the middle layer and the outer surface layer through three channels of a three-layer co-extrusion casting machine, and then casting to form a base film;
wherein the melt extrusion temperature is as follows: the inner surface layer is 160 ℃, the middle layer is 180 ℃ and the outer surface layer is 250 ℃;
(2) and (2) biaxially stretching the base film obtained in the step (1) at the stretching speed of 10m/min at the temperature of 85 ℃, wherein the transverse and longitudinal stretching times are 8 times, and then heating and shaping at the temperature of 180 ℃ for 10min to obtain the TPU film for sealing the electronic component.
Example 2
A TPU film for sealing electronic components comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially laminated;
wherein the inner surface layer consists of 45 wt% of polyether polyurethane elastomer, 30 wt% of POE and 25 wt% of PA1010, and the thickness is 6 μm;
the intermediate layer consists of 35 wt% of polyester polyurethane elastomer, 20 wt% of EVOH and 45 wt% of PC, and the thickness is 18 μm;
the outer skin layer was composed of 55 wt% of polyether urethane elastomer and 45 wt% of PTFE, and had a thickness of 6 μm.
The preparation method of the TPU film comprises the following steps:
(1) according to the formula, respectively melting and extruding the components of the inner surface layer, the middle layer and the outer surface layer through three channels of a three-layer co-extrusion casting machine, and then casting to form a base film;
wherein the melt extrusion temperature is as follows: the inner surface layer is 200 ℃, the middle layer is 220 ℃ and the outer surface layer is 280 ℃;
(2) and (2) biaxially stretching the base film obtained in the step (1) at a stretching speed of 5m/min at 100 ℃, wherein the transverse and longitudinal stretching times are 7 times, and then heating and shaping at 200 ℃ for 5min to obtain the TPU film for sealing the electronic component.
Example 3
A TPU film for sealing electronic components comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially laminated;
wherein, the inner surface layer consists of 50 wt% of polyether polyurethane elastomer, 20 wt% of POE and 30 wt% of PA6, and the thickness is 12 μm;
the intermediate layer consists of 30 wt% of polyester polyurethane elastomer, 20 wt% of EVOH and 50 wt% of PC, and the thickness is 16 μm;
the outer skin layer was composed of 45 wt% of polyether urethane elastomer and 55 wt% of PTFE, and had a thickness of 12 μm.
The preparation method of the TPU film comprises the following steps:
(1) according to the formula, respectively melting and extruding the components of the inner surface layer, the middle layer and the outer surface layer through three channels of a three-layer co-extrusion casting machine, and then casting to form a base film;
wherein the melt extrusion temperature is as follows: the inner surface layer is 180 ℃, the middle layer is 200 ℃ and the outer surface layer is 290 ℃;
(2) and (2) biaxially stretching the base film obtained in the step (1) at a stretching speed of 8m/min at 90 ℃, wherein the transverse and longitudinal stretching times are 6 times, and then heating and shaping at 190 ℃ for 8min to obtain the TPU film for sealing the electronic component.
Example 4
A TPU film for sealing electronic components comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially laminated;
wherein the inner surface layer consists of 55 wt% of polyether polyurethane elastomer, 15 wt% of POE and 30 wt% of MKD6, and the thickness is 6 μm;
the intermediate layer consists of 25 wt% of polyester polyurethane elastomer, 30 wt% of EVOH and 45 wt% of PC, and the thickness is 42 μm;
the outer skin layer was composed of 40 wt% of polyether urethane elastomer and 60 wt% of PTFE, and had a thickness of 12 μm.
The preparation method of the TPU film comprises the following steps:
(1) according to the formula, respectively melting and extruding the components of the inner surface layer, the middle layer and the outer surface layer through three channels of a three-layer co-extrusion casting machine, and then casting to form a base film;
wherein the melt extrusion temperature is as follows: the inner surface layer is 170 ℃, the middle layer is 210 ℃ and the outer surface layer is 270 ℃;
(2) and (2) biaxially stretching the base film obtained in the step (1) at a stretching speed of 6m/min at 95 ℃, wherein the transverse and longitudinal stretching times are 5 times, and then heating and shaping at 180 ℃ for 6min to obtain the TPU film for sealing the electronic component.
Example 5
A TPU film for sealing electronic components comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially laminated;
wherein the inner surface layer consists of 60 wt% of polyether polyurethane elastomer, 20 wt% of POE and 20 wt% of MKD6, and the thickness is 16 μm;
the intermediate layer consists of 20 wt% of polyester polyurethane elastomer, 30 wt% of EVOH and 50 wt% of PC, and has a thickness of 56 μm;
the outer skin layer consisted of 42 wt% of polyether polyurethane elastomer and 58 wt% of PTFE and was 8 μm thick.
The preparation method of the TPU film comprises the following steps:
(1) according to the formula, respectively melting and extruding the components of the inner surface layer, the middle layer and the outer surface layer through three channels of a three-layer co-extrusion casting machine, and then casting to form a base film;
wherein the melt extrusion temperature is as follows: the inner surface layer is 185 ℃, the middle layer is 210 ℃ and the outer surface layer is 280 ℃;
(2) and (2) biaxially stretching the base film obtained in the step (1) at a stretching speed of 7m/min at 90 ℃ with the transverse and longitudinal stretching times being 4 times, and then heating and shaping at 200 ℃ for 5min to obtain the TPU film for sealing the electronic component.
Example 6
A TPU film for sealing electronic components comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially laminated;
wherein, the inner surface layer consists of 50 wt% of polyether polyurethane elastomer, 30 wt% of POE and 20 wt% of MKD6, and the thickness is 25 μm;
the intermediate layer consists of 30 wt% of polyester polyurethane elastomer, 30 wt% of EVOH and 40 wt% of PC, and the thickness is 50 μm;
the outer skin layer was composed of 50 wt% of polyether urethane elastomer and 50 wt% of PTFE, and had a thickness of 25 μm.
The preparation method of the TPU film comprises the following steps:
(1) according to the formula, respectively melting and extruding the components of the inner surface layer, the middle layer and the outer surface layer through three channels of a three-layer co-extrusion casting machine, and then casting to form a base film;
wherein the melt extrusion temperature is as follows: the inner surface layer is 180 ℃, the middle layer is 200 ℃ and the outer surface layer is 260 ℃;
(2) and (2) biaxially stretching the base film obtained in the step (1) at a stretching speed of 8m/min at 100 ℃, wherein the transverse and longitudinal stretching times are 3 times, and then heating and shaping at 180 ℃ for 10min to obtain the TPU film for sealing the electronic component.
Comparative example 1
The difference from example 1 is that the inner skin layer is composed of 60 wt% of polyether urethane elastomer, 10 wt% of POE and 30 wt% of PA6, and the other layers are composed and prepared in the same manner as in example 1.
Comparative example 2
The difference from example 1 is that the inner skin layer is composed of 45 wt% of polyether urethane elastomer, 40 wt% of POE and 15 wt% of PA6, and the other layers are composed and prepared in the same manner as in example 1.
Comparative example 3
The difference from example 1 is that the intermediate layer consists of 40 wt% of polyester polyurethane elastomer, 15 wt% of EVOH and 45 wt% of PC, and the other layer composition and preparation method are the same as example 1.
Comparative example 4
The difference from example 1 is that the intermediate layer is composed of 40 wt% of polyester urethane elastomer, 30 wt% of EVOH, and 30 wt% of PC, and the other layer composition and preparation method are the same as example 1.
Comparative example 5
The difference from example 1 is that the outer skin layer is composed of 70 wt% of polyether urethane elastomer and 30 wt% of PTFE, and the other layer composition and preparation method are the same as example 1.
Comparative example 6
The difference from example 1 is that the outer skin layer is composed of 30 wt% of polyether urethane elastomer and 70 wt% of PTFE, and the other layer composition and preparation method are the same as example 1.
The properties of the TPU films provided in examples 1-6 and comparative examples 1-6 above were tested according to the following test criteria:
water vapor transmission rate: testing was carried out according to the method of GB/T1037-1998;
oxygen transmission rate: testing according to the method of GB/T1038-2000;
puncture resistance strength: according to the method of GB/T10004-2008, the force required by the penetration of the TPU thin film is measured as the puncture resistance strength under the conditions that the diameter of the needle head is 1mm and the advancing speed is 50 mm/min.
The results of the above tests are shown in table 1 below:
TABLE 1
Figure BDA0001518107100000111
The results in table 1 show that the TPU film obtained by the present invention has high water resistance, oxygen barrier property and puncture resistance by reasonably matching the compositions of the inner surface layer, the intermediate layer and the outer surface layer, and can be used for sealing electronic components. When the mating relationship between the components of the layers is broken, this can result in a reduction in the water, oxygen and puncture resistance.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (16)

1. The water vapor transmission rate is 0.008-0.02g/m224h of the TPU film for sealing an electronic component, wherein the TPU film comprises an inner surface layer, an intermediate layer, and an outer surface layer which are sequentially laminated;
the inner surface layer consists of 40-60 wt% of polyether polyurethane elastomer, 15-40 wt% of polyolefin elastomer and 20-30 wt% of polyamide;
the middle layer consists of 20-40 wt% of polyester polyurethane elastomer, 20-30 wt% of ethylene-vinyl alcohol copolymer and 35-50 wt% of polycarbonate;
the outer surface layer consists of 40-60 wt% of polyether polyurethane elastomer and 40-60 wt% of polytetrafluoroethylene.
2. The TPU film of claim 1 wherein the inner skin layer is comprised of 50 wt% polyether urethane elastomer, 30 wt% polyolefin elastomer, and 20 wt% polyamide.
3. The TPU film of claim 1 or 2 wherein the intermediate layer is comprised of 30 wt% polyester urethane elastomer, 30 wt% ethylene vinyl alcohol copolymer and 40 wt% polycarbonate.
4. The TPU film of claim 1 wherein the outer skin layer is comprised of 50 weight percent polyether urethane elastomer and 50 weight percent polytetrafluoroethylene.
5. The TPU film of claim 1, wherein the ratio of the thicknesses between the inner skin layer, the intermediate layer, and the outer skin layer is (1-3): (4-8): (1-3).
6. The TPU film of claim 1 having a thickness of from 20 to 100 μm.
7. The TPU film of claim 1 wherein the polyolefin elastomer is an ethylene octene elastomer.
8. The TPU film of claim 1 wherein the polyamide is selected from one or a combination of at least two of polycaprolactam, polydecamethylenesebacamide, or polycaprometadimethylamine.
9. The TPU film of claim 1 wherein the ethylene vinyl alcohol copolymer has a molar content of vinyl alcohol units of 50 to 60 percent.
10. The process for preparing a TPU film according to any of claims 1-9 comprising the steps of:
(1) according to the formula, respectively melting and extruding the components of the inner surface layer, the middle layer and the outer surface layer through three channels of a three-layer co-extrusion casting machine, and then casting to form a base film;
(2) and (2) biaxially stretching the base film obtained in the step (1), and then heating and shaping to obtain the TPU film for sealing the electronic component.
11. The production method according to claim 10, wherein the temperature of the melt extrusion in the step (1) is: the inner surface layer is 160-200 ℃, the middle layer is 180-220 ℃, and the outer surface layer is 250-300 ℃.
12. The method according to claim 10, wherein the processing temperature of the biaxial stretching in the step (2) is 85 to 100 ℃.
13. The production method according to claim 10, wherein the drawing rate of the biaxial drawing in the step (2) is 5 to 10 m/min.
14. The production method according to claim 10, wherein the stretching ratio in the transverse direction and the longitudinal direction of the biaxial stretching in the step (2) is the same and is 3 to 8 times.
15. The method as claimed in claim 10, wherein the temperature for heat setting in step (2) is 180-200 ℃ and the setting time is 5-10 min.
16. The method of claim 10, comprising the steps of:
(1) according to the formula, the components of the inner surface layer, the middle layer and the outer surface layer are respectively melted and extruded through three channels of a three-layer co-extrusion casting machine, wherein the melting and extrusion temperature is as follows: the inner surface layer is 160-200 ℃, the middle layer is 180-220 ℃, and the outer surface layer is 250-300 ℃ and then the base film is formed by tape casting;
(2) biaxially stretching the base film obtained in the step (1) at the stretching speed of 5-10m/min at the temperature of 85-100 ℃, wherein the transverse and longitudinal stretching times are 3-8 times, and then heating and shaping at the temperature of 180-200 ℃ for 5-10min to obtain the base film with the water vapor transmission rate of 0.008-0.02g/m224h of a TPU film for sealing electronic parts.
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