CN112714604B - High-pressure-resistant high-overload shielding paper and preparation method thereof - Google Patents

High-pressure-resistant high-overload shielding paper and preparation method thereof Download PDF

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CN112714604B
CN112714604B CN201911026739.9A CN201911026739A CN112714604B CN 112714604 B CN112714604 B CN 112714604B CN 201911026739 A CN201911026739 A CN 201911026739A CN 112714604 B CN112714604 B CN 112714604B
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sensitive adhesive
hot
pressure
melt pressure
paper
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CN112714604A (en
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汤海涛
陆明庆
陆泫西
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Jiangsu Donggao Electric Co ltd
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Nantong Yazheng Power Technology Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0098—Shielding materials for shielding electrical cables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/003—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • 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
    • C09J7/35—Heat-activated
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • 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
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/387—Block-copolymers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

The invention discloses high-voltage-resistant high-overload shielding paper and a preparation method thereof, and relates to the technical field of electrical materials. The high-temperature-resistant performance of the aluminum foil can be improved by arranging the cable paper on the two sides of the aluminum foil, the shielding paper can still play a good role in shielding and insulating when the voltage or current of the cable is overlarge, and the degradation phenomenon of the shielding paper at high temperature can be reduced due to the good high-temperature-resistant performance of the shielding paper, so that the service life of the shielding paper can be prolonged.

Description

High-pressure-resistant high-overload shielding paper and preparation method thereof
Technical Field
The invention relates to the technical field of electrical materials, in particular to ultrahigh-voltage high-overload shielding paper and a preparation method thereof.
Background
Electromagnetic Wave Shielding Paper (Shielding Paper of Electromagnetic Wave), also can be translated into Electromagnetic Wave Shielding Paper, and is called Shielding Paper for short; the shielding paper is mainly used for shielding electromagnetic waves or electric signals of electric products; the shielding paper has insulating property, so the shielding paper can be used for high-voltage power cables, control cables and signal cables. The shielding paper is wrapped on the outermost layer of the cable and used for protecting the insulation layer seal of the wire core of the wire, so that moisture cannot enter the cable, the insulation layer cannot be damaged, and the cable generally has high tensile strength, folding strength and tearing strength.
The shielding paper is mainly compounded by aluminum foil and cable paper, the cable paper is generally made by taking unbleached sulfate softwood pulp as a raw material, free pulping, no sizing and no filling, and a fourdrinier papermaking machine; the outer surface of the finished cable paper product is coated with an epoxy resin layer; when the coil is used for interlayer insulation and turn-to-turn insulation of a power transformer, one side of the shielding paper coated with the epoxy resin layer is wound on the coil, the epoxy resin layer on the shielding paper starts to melt along with the rise of temperature in the process of drying the coil to generate an adhesion effect, and the epoxy resin layer starts to solidify along with the rise of temperature to enable adjacent layers of the coil to be adhered into a fixing unit, so that the shielding paper is fixed on the coil.
However, when the voltage or current of the electric equipment is too large, the electric equipment is easily overloaded and the operating temperature exceeds the allowable value, so that the shielding paper is accelerated to deteriorate, and the service life is greatly shortened.
Disclosure of Invention
One of the objectives of the present invention is to provide a high voltage resistant high overload shielding paper, which can improve the high temperature resistance by disposing cable paper on both sides of an aluminum foil, and when the voltage or current of a cable is too large, the shielding paper can still have good shielding and insulating effects, and because the shielding paper has good high temperature resistance, the deterioration phenomenon at high temperature can be reduced, and the service life can be prolonged.
The technical purpose of the invention is realized by the following technical scheme:
the high-voltage-resistant high-overload shielding paper comprises an aluminum foil layer and cable paper layers arranged on two sides of the aluminum foil layer, wherein an adhesive layer is arranged between the aluminum foil layer and the cable paper layers.
By adopting the technical scheme, the aluminum foil is soft in texture, good in ductility and good in moisture resistance and insulating property, the aluminum foil is compounded with the cable paper through the adhesive, and the obtained shielding paper not only has good shielding and insulating properties, but also can isolate the aluminum foil from air due to the protection of the cable paper so as to prevent the aluminum foil from being oxidized; and because the both sides of aluminium foil all are equipped with the cable paper, can improve its high temperature resistance, when cable voltage or electric current are too big, shielding paper still can play fine shielding insulation effect, because shielding paper has fine high temperature resistance, consequently also can reduce its degradation phenomenon under high temperature, can prolong its life.
The invention also aims to provide a preparation method of the high-pressure-resistant high-overload shielding paper.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of high-pressure-resistant high-overload shielding paper comprises the following steps:
s1, taking a soft aluminum foil with a clean and non-pollution surface, and heating the soft aluminum foil to 120-130 ℃ for later use;
s2, respectively attaching two hot-melt pressure-sensitive adhesive films to two sides of the aluminum foil, and cooling the aluminum foil to 30-40 ℃ for later use;
s3, placing two pieces of cable paper on the hot-melt pressure-sensitive adhesive films on two sides of the aluminum foil respectively, enabling the inner sides of the cable paper to be in contact with the hot-melt pressure-sensitive adhesive films, and then applying pressure to the cable paper to enable the cable paper and the hot-melt pressure-sensitive adhesive films to be attached together, so that the high-voltage-resistant high-overload shielding paper is obtained.
By adopting the technical scheme, the hot-melt pressure-sensitive adhesive film is attached to the heated aluminum foil, so that the hot-melt pressure-sensitive adhesive film is adhered to the aluminum foil to form an aluminum foil layer, then the cable paper is placed on the cooled hot-melt pressure-sensitive adhesive film, the cable paper is attached to the hot-melt pressure-sensitive adhesive film by applying pressure, and the obtained shielding paper has good high-temperature-resistant insulating property. Because the cable paper is attached to the hot-melt pressure-sensitive adhesive film through pressure, the epoxy resin on the surface of the cable paper is not melted when the shielding paper is prepared, so that the bonding property of the shielding paper to the cable is not influenced; when the shielding paper is applied, one side of the shielding paper coated with the epoxy resin layer is wound on the coil, the epoxy resin layer on the shielding paper starts to melt along with the rise of the temperature of the coil to generate an adhesion effect, the epoxy resin layer starts to solidify along with the rise of the temperature, and meanwhile, the hot melt adhesive film in the shielding paper melts after the rise of the temperature, so that the bonding strength between the aluminum foil and the cable paper can be increased, the hot melt pressure sensitive adhesive film has good high temperature resistance, and when the working temperature rises due to the high-pressure overload of a cable, the hot melt pressure sensitive adhesive film can absorb certain heat, so that the heat transferred to the cable paper is reduced, the degradation phenomenon of the shielding paper at high temperature is reduced, and the service life of the shielding paper is prolonged; in addition, the hot-melt pressure-sensitive adhesive film does not contain a solvent, does not volatilize the solvent at a high temperature, does not release gas harmful to the environment, and is beneficial to environmental protection.
Further, the pressing pressure in S3 is 10-20kg/m 2 。
By adopting the technical scheme, the weight ratio of 10-20kg/m 2 Under the pressure of the pressure, the cable paper can be adhered to the hot-melt pressure-sensitive adhesive film, and the shielding paper cannot be damaged; then, in the process of using the shielding paper, the hot-melt pressure-sensitive adhesive film is also melted in the process of melting the epoxy resin on the cable paper, so that the bonding strength between the aluminum foil and the cable paper can be improved.
Further, the hot melt pressure sensitive adhesive film in the S2 is prepared from the following raw materials in parts by weight: 50-60 parts of styrene-isoprene-styrene block copolymer, 10-20 parts of poly alpha-methyl styrene resin, 10-20 parts of ethylene-vinyl acetate copolymer, 5-7 parts of ethylene-1-octene copolymer, 3-5 parts of tackifying resin, 2-4 parts of lauryl acrylate, 2-3 parts of isooctyl acrylate, 1-2 parts of plasticizer, 0.5-1 part of aminopropyltriethoxysilane and 0.5-1 part of antioxidant.
By adopting the technical scheme, the raw materials of the hot-melt pressure-sensitive adhesive film do not contain a solvent, so that the solvent is not volatilized in the preparation and use processes, and the environment is protected; styrene-isoprene-styrene block copolymer (SIS) is used as a main raw material, and the adhesion strength of the cable paper and the aluminum foil at high temperature can be improved through the matching of poly alpha-methyl styrene resin, EVA, POE, tackifying resin and aminopropyltriethoxysilane; the flexibility of the hot-melt pressure-sensitive adhesive film can be improved through POE, lauryl acrylate and isooctyl acrylate, and the phenomenon that the shielding paper cracks in the process of winding a cable can be prevented; the high temperature resistance of the hot melt pressure sensitive adhesive film can be improved through the matching of the poly alpha-methyl styrene resin, the tackifying resin and the antioxidant, and in the use process of the shielding paper, when the working temperature is increased due to the overload of the cable, the hot melt pressure sensitive adhesive film can absorb a part of heat and reduce the transmission of the heat on the surface layer cable paper, so that the degradation phenomenon of the shielding paper at high temperature is reduced, and the service life of the shielding paper is prolonged.
Further, the tackifying resin is one of terpene resin and hydrogenated rosin resin or a composite of the terpene resin and the hydrogenated rosin resin.
By adopting the technical scheme, the terpene resin has the advantages of high adhesive force, oxidation resistance and thermal stability, and has good compatibility with both SIS and EVA; the hydrogenated rosin resin has the advantages of good oxidation resistance, low brittleness and high thermal stability, and the adhesive strength of the hot melt adhesive film can be improved by adding the tackifying resin, so that the adhesive force between the cable paper and the aluminum foil is improved.
Further, the plasticizer is epoxidized soybean oil.
By adopting the technical scheme, the epoxidized soybean oil has excellent thermal stability, and the high-temperature resistance of the hot-melt pressure-sensitive adhesive film can be improved.
Further, the antioxidant is prepared by mixing tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tri [2, 4-di-tert-butylphenyl ] phosphite in a weight ratio of 4: 1.
By adopting the technical scheme, tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, namely the antioxidant 1010 belongs to phenolic antioxidants, and tri [2, 4-di-tert-butylphenyl ] phosphite ester, namely the antioxidant 168 belongs to phosphite antioxidants; when the antioxidant 1010 and the antioxidant 168 are matched, a synergistic effect is achieved, and excellent antioxidant performance and thermal stability performance are achieved.
Further, the hot melt pressure sensitive adhesive film is prepared by adopting the following method:
(1) taking 50-60 parts of styrene-isoprene-styrene block copolymer, 10-20 parts of poly alpha-methyl styrene resin, 10-20 parts of ethylene-vinyl acetate copolymer, 5-7 parts of ethylene-1-octene copolymer, 3-5 parts of tackifying resin, 2-4 parts of lauryl acrylate, 2-3 parts of isooctyl acrylate, 1-2 parts of plasticizer, 0.5-1 part of aminopropyltriethoxysilane and 0.5-1 part of antioxidant, and uniformly mixing to obtain a mixture;
(2) placing the mixture in a double-screw extruder, heating for 15-25min at the temperature of 180-190 ℃, and obtaining hot-melt pressure-sensitive adhesive particles after melting, extruding and granulating;
(3) and carrying out tape casting processing on the hot-melt pressure-sensitive adhesive particles at the temperature of 120-130 ℃ to obtain the hot-melt pressure-sensitive adhesive film.
Furthermore, the temperature of each section of the double-screw extruder is 180 ℃ in the first zone, 180 ℃ in the second zone, 185 ℃ in the third zone, 190 ℃ in the fourth zone, 180 ℃ in the fifth zone and 180 ℃ in the sixth zone.
By adopting the technical scheme, the raw materials can be melted and mixed uniformly at the temperature, and the stability of the performance of the hot-melt pressure-sensitive adhesive film is improved.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. the aluminum foil is soft in texture, good in ductility and good in moisture resistance and insulating property, the aluminum foil is compounded with the cable paper through the adhesive, and the obtained shielding paper has good shielding and insulating properties, and can isolate the aluminum foil from air due to the protection of the cable paper so as to prevent the aluminum foil from being oxidized; the cable paper is arranged on the two sides of the aluminum foil, so that the high-temperature resistance of the aluminum foil can be improved, when the voltage or the current of the cable is too large, the shielding paper still can play a good role in shielding and insulating, and the deterioration phenomenon of the shielding paper at high temperature can be reduced due to the good high-temperature resistance of the shielding paper, so that the service life of the shielding paper can be prolonged;
2. the raw materials of the hot-melt pressure-sensitive adhesive film do not contain solvent, so that the solvent is not volatilized in the preparation and use processes, and the environment is protected; styrene-isoprene-styrene block copolymer (SIS) is used as a main raw material, and the adhesion strength of the cable paper and the aluminum foil at high temperature can be improved through the matching of poly alpha-methyl styrene resin, EVA, POE, tackifying resin and aminopropyltriethoxysilane; the flexibility of the hot-melt pressure-sensitive adhesive film can be improved through POE, lauryl acrylate and isooctyl acrylate, and the phenomenon that the shielding paper cracks in the process of winding a cable can be prevented; the high temperature resistance of the hot melt pressure sensitive adhesive film can be improved through the matching of the poly alpha-methyl styrene resin, the tackifying resin and the antioxidant, and in the use process of the shielding paper, when the working temperature is increased due to the overload of the cable, the hot melt pressure sensitive adhesive film can absorb a part of heat and reduce the transmission of the heat on the surface layer cable paper, so that the degradation phenomenon of the shielding paper at high temperature is reduced, and the service life of the shielding paper is prolonged.
Drawings
Fig. 1 is a schematic view of the layer structure of the high-voltage-resistant high-overload shielding paper in example 1.
In the figure, 1, an aluminum foil layer; 2. an adhesive layer; 3. and (4) a cable paper layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
First, preparation example of Hot melt pressure sensitive adhesive film
The styrene-isoprene-styrene block copolymers in the following preparations were selected from SIS available from the ba ling petrochemical under the designation 1106; the poly alpha-methyl styrene resin is selected from hot melt poly alpha-methyl styrene resin provided by Shandong Liang New Material science and technology company; the ethylene-vinyl acetate copolymer is selected from EVA available from le tian of korea under the designation VA 910; the ethylene-1-octene copolymer is selected from POE available from Mitsui Chemicals under the designation DF 605.
Preparation example 1: (1) taking 50kg of styrene-isoprene-styrene block copolymer, 10kg of poly alpha-methyl styrene resin, 10kg of ethylene-vinyl acetate copolymer, 5kg of ethylene-1-octene copolymer, 3kg of tackifying resin, 2kg of lauryl acrylate, 2kg of isooctyl acrylate, 1kg of plasticizer, 0.5kg of aminopropyltriethoxysilane and 0.5kg of antioxidant, and uniformly mixing to obtain a mixture; wherein the tackifying resin is terpene resin; the plasticizer is epoxidized soybean oil; the antioxidant is formed by mixing an antioxidant 1010 and an antioxidant 168 in a weight ratio of 4: 1;
(2) placing the mixture in a double-screw extruder, heating each section of the double-screw extruder at a temperature of 180 ℃ in a first zone, 180 ℃ in a second zone, 185 ℃ in a third zone, 190 ℃ in a fourth zone, 180 ℃ in a fifth zone and 180 ℃ in a sixth zone for 15-25min, and melting, extruding and granulating to obtain hot-melt pressure-sensitive adhesive particles;
(3) and (3) placing the hot-melt pressure-sensitive adhesive particles in a calender, and carrying out tape casting processing at the temperature of 120 ℃ to obtain the hot-melt pressure-sensitive adhesive film.
Preparation example 2: (1) taking 55kg of styrene-isoprene-styrene block copolymer, 15kg of poly alpha-methyl styrene resin, 15kg of ethylene-vinyl acetate copolymer, 6kg of ethylene-1-octene copolymer, 4kg of tackifying resin, 3kg of lauryl acrylate, 2.5kg of isooctyl acrylate, 1.5kg of plasticizer, 0.75kg of aminopropyltriethoxysilane and 0.75kg of antioxidant, and uniformly mixing to obtain a mixture; wherein the tackifying resin is hydrogenated rosin resin; the plasticizer is epoxidized soybean oil; the antioxidant is formed by mixing an antioxidant 1010 and an antioxidant 168 in a weight ratio of 4: 1;
(2) placing the mixture in a double-screw extruder, heating each section of the double-screw extruder at a temperature of 180 ℃ in a first zone, 180 ℃ in a second zone, 185 ℃ in a third zone, 190 ℃ in a fourth zone, 180 ℃ in a fifth zone and 180 ℃ in a sixth zone for 15-25min, and melting, extruding and granulating to obtain hot-melt pressure-sensitive adhesive particles;
(3) and (3) placing the hot-melt pressure-sensitive adhesive particles in a calender, and carrying out tape casting processing at the temperature of 125 ℃ to obtain the hot-melt pressure-sensitive adhesive film.
Preparation example 3: (1) taking 60kg of styrene-isoprene-styrene block copolymer, 20kg of poly alpha-methyl styrene resin, 20kg of ethylene-vinyl acetate copolymer, 7kg of ethylene-1-octene copolymer, 5kg of tackifying resin, 4kg of lauryl acrylate, 3kg of isooctyl acrylate, 2kg of plasticizer, 1kg of aminopropyltriethoxysilane and 1kg of antioxidant, and uniformly mixing to obtain a mixture; wherein the tackifying resin is formed by mixing terpene resin and hydrogenated rosin resin in a weight ratio of 1: 1; the plasticizer is epoxidized soybean oil; the antioxidant is formed by mixing an antioxidant 1010 and an antioxidant 168 in a weight ratio of 4: 1;
(2) placing the mixture in a double-screw extruder, heating each section of the double-screw extruder at a temperature of 180 ℃ in a first zone, 180 ℃ in a second zone, 185 ℃ in a third zone, 190 ℃ in a fourth zone, 180 ℃ in a fifth zone and 180 ℃ in a sixth zone for 15-25min, and melting, extruding and granulating to obtain hot-melt pressure-sensitive adhesive particles;
(3) and (3) placing the hot-melt pressure-sensitive adhesive particles in a calender, and carrying out tape casting processing at the temperature of 130 ℃ to obtain the hot-melt pressure-sensitive adhesive film.
Preparation example 4: this preparation example is different from preparation example 1 in that the raw materials do not contain poly α -methylstyrene resin and aminopropyltriethoxysilane.
Preparation example 5: the difference between the present preparation example and preparation example 1 is that POE, lauryl acrylate, and isooctyl acrylate were not included in the raw materials.
Preparation example 6: the present production example differs from production example 1 in that the raw materials do not contain lauryl acrylate or isooctyl acrylate.
Preparation example 7: this production example is different from production example 1 in that the raw material does not contain a poly α -methylstyrene resin and a tackifier resin.
Second, the embodiment
The high-density cable paper in the following embodiments is selected from high-density cable paper provided by the eastern industry insulation material corporation of Shaoyang, and the thickness of the high-density cable paper is 0.08 + -0.005 mm.
Example 1: the high-pressure-resistant high-overload shielding paper is prepared by the following method:
s1, taking a soft aluminum foil with the thickness of 20 mu m and clean and non-fouling surface, and heating the soft aluminum foil to 120 ℃ for later use;
s2, respectively attaching two pieces of hot melt pressure sensitive adhesive films (selected from preparation example 1) with the thickness of 40 μm to two sides of an aluminum foil, and cooling to 30 ℃ for later use;
s3, placing two pieces of cable paper with the thickness of 80 mu m on the hot-melt pressure-sensitive adhesive films on the two sides of the aluminum foil respectively, enabling the inner side of the cable paper to be in contact with the hot-melt pressure-sensitive adhesive films, and then applying pressure to the cable paper to enable the cable paper and the hot-melt pressure-sensitive adhesive films to be adhered together to obtain the high-voltage-resistant high-overload shielding paper.
Referring to fig. 1, the high-voltage-resistant high-overload shielding paper comprises an aluminum foil layer 1 and cable paper layers 3 arranged on two sides of the aluminum foil layer 1, and an adhesive layer 2 is arranged between the aluminum foil layer 1 and the cable paper layers 3; the thickness of the aluminum foil is 20 μm, and the thickness of the hot-melt pressure-sensitive adhesive film is 40 μm.
Example 2: the high-pressure-resistant high-overload shielding paper is prepared by the following method:
s1, taking a soft aluminum foil with the thickness of 20 mu m and clean and non-fouling surface, and heating the soft aluminum foil to 125 ℃ for later use;
s2, respectively attaching two pieces of hot melt pressure sensitive adhesive films (selected from preparation example 2) with the thickness of 40 μm to two sides of an aluminum foil, and cooling to 35 ℃ for later use;
s3, placing two pieces of cable paper with the thickness of 80 mu m on the hot-melt pressure-sensitive adhesive films on the two sides of the aluminum foil respectively, enabling the inner side of the cable paper to be in contact with the hot-melt pressure-sensitive adhesive films, and then applying pressure to the cable paper to enable the cable paper and the hot-melt pressure-sensitive adhesive films to be adhered together to obtain the high-voltage-resistant high-overload shielding paper.
Example 3: the high-pressure-resistant high-overload shielding paper is prepared by the following method:
s1, taking a soft aluminum foil with the thickness of 20 mu m and clean and non-fouling surface, and heating the soft aluminum foil to 130 ℃ for later use;
s2, respectively attaching two pieces of hot melt pressure sensitive adhesive films (selected from preparation example 3) with the thickness of 40 μm to two sides of an aluminum foil, and cooling to 40 ℃ for later use;
s3, placing two pieces of cable paper with the thickness of 80 mu m on the hot-melt pressure-sensitive adhesive films on the two sides of the aluminum foil respectively, enabling the inner side of the cable paper to be in contact with the hot-melt pressure-sensitive adhesive films, and then applying pressure to the cable paper to enable the cable paper and the hot-melt pressure-sensitive adhesive films to be adhered together to obtain the high-voltage-resistant high-overload shielding paper.
Third, comparative example
Comparative example 1: this comparative example is different from example 1 in that a hot melt pressure sensitive adhesive film was prepared from preparation example 4.
Comparative example 2: this comparative example is different from example 1 in that a hot melt pressure sensitive adhesive film was prepared from preparation example 5.
Comparative example 3: this comparative example is different from example 1 in that a hot melt pressure sensitive adhesive film was prepared from preparation example 6.
Comparative example 4: this comparative example is different from example 1 in that a hot melt pressure sensitive adhesive film was prepared from preparation example 7.
Fourthly, performance test
Shielding papers were prepared according to the methods of examples 1 to 3 and comparative examples 1 to 4, and their properties were measured according to the following methods, and the results are shown in table 1.
Adhesion force: dividing the grid according to 5mm, and then carrying out a cupping test; when no peeling occurs at 8mm, the adhesive force is excellent; when 6mm is not stripped, the adhesive force is good; 6mm is not qualified when peeled off.
VOC: the VOC content of the adhesive was tested according to GB/T2793-1995, determination of the content of non-volatiles in the adhesive.
Heat resistance: and continuously heating the shielding paper for 24h at the temperature of 140 ℃, and observing whether the shielding paper has edge warping and cracks.
The folding endurance, the power frequency breakdown voltage and the conductivity of the water extract are tested according to GB7969-2003 Power Cable paper, and the insulation aging performance is that the sample is used for testing the conductivity of the water extract of the shielding paper subjected to heat resistance detection.
TABLE 1
Figure BDA0002248867400000071
The data in table 1 show that the shielding paper prepared by the invention has good insulating property, the cable paper and the aluminum foil have excellent bonding strength, volatile harmful gas is not contained, and the environment is protected, and the excellent folding endurance shows that the shielding paper obtained by compounding the aluminum foil, the hot-melt pressure-sensitive adhesive film and the cable paper has good flexibility and folding endurance, and is suitable for being used in the environment of being wound on the surface of a cable; in addition, the shielding paper is essentially an insulating material, the insulating effect of the shielding paper is gradually reduced along with the increase of the temperature, namely, the insulation aging, and as can be seen from table 1, the shielding paper prepared by the invention has good heat resistance and insulation aging performance, which indicates that the shielding paper can still keep good insulation shielding effect when the temperature of the cable is increased due to overload.
The hot melt pressure sensitive adhesive film of comparative example 1 was prepared from preparation example 4; the raw materials for preparing the hot-melt pressure-sensitive adhesive film do not contain poly alpha-methyl styrene resin and aminopropyl triethoxysilane; compared with example 1, the adhesion between the cable paper and the aluminum foil is reduced in comparative example 1, which shows that the addition of poly alpha-methylstyrene resin and aminopropyltriethoxysilane can improve the adhesive strength of the hot melt pressure sensitive adhesive film.
The hot melt pressure sensitive adhesive film of comparative example 2 was prepared from preparation example 5; the hot-melt pressure-sensitive adhesive film does not contain POE, lauryl acrylate and isooctyl acrylate in the preparation raw materials; compared with the embodiment 1, the folding resistance of the comparative example 2 is obviously reduced, which shows that the addition of POE, lauryl acrylate and isooctyl acrylate can improve the flexibility of the hot-melt pressure-sensitive adhesive film and can prevent the shielding paper from cracking in the process of winding the cable; this is because if the brittleness of the hot-melt pressure-sensitive adhesive film is too high, the hot-melt pressure-sensitive adhesive film may accelerate the breaking rate of the cable paper during the bending process of the shielding paper.
The hot melt pressure sensitive adhesive film of comparative example 3 was prepared from preparation example 6; the raw materials for preparing the hot-melt pressure-sensitive adhesive film do not contain lauryl acrylate and isooctyl acrylate; compared with example 1, the folding endurance of comparative example 3 is obviously reduced, which shows that the addition of lauryl acrylate and isooctyl acrylate can improve the flexibility of the hot melt pressure sensitive adhesive film; compared with the comparative example 2, the folding resistance of the comparative example 3 is slightly improved, which shows that POE, lauryl acrylate and isooctyl acrylate have a synergistic effect when being matched, and the flexibility of the shielding paper can be obviously improved.
The hot melt pressure sensitive adhesive film of comparative example 4 was prepared from preparation example 7; the raw materials for preparing the hot-melt pressure-sensitive adhesive film do not contain poly alpha-methyl styrene resin and tackifying resin; compared with example 1, the adhesive force, heat resistance and insulation aging performance of the adhesive film in comparative example 4 are obviously reduced, which shows that the addition of the poly alpha-methylstyrene resin and the tackifying resin can reduce the adhesive strength and heat resistance of the hot melt pressure sensitive adhesive film, but the performance of the hot melt pressure sensitive adhesive film can not be reduced too much due to the existence of the antioxidant.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (6)

1. A preparation method of high-pressure-resistant high-overload shielding paper is characterized by comprising the following steps: the method comprises the following steps:
s1, taking a soft aluminum foil with a clean and non-pollution surface, and heating the soft aluminum foil to 120-130 ℃ for later use;
s2, respectively attaching two hot-melt pressure-sensitive adhesive films to two sides of the aluminum foil, and cooling the aluminum foil to 30-40 ℃ for later use;
s3, placing two pieces of cable paper on the hot-melt pressure-sensitive adhesive films on two sides of the aluminum foil respectively, enabling the inner sides of the cable paper to be in contact with the hot-melt pressure-sensitive adhesive films, and then applying pressure to the cable paper to enable the cable paper and the hot-melt pressure-sensitive adhesive films to be adhered together to obtain the high-voltage-resistant high-overload shielding paper;
the hot-melt pressure-sensitive adhesive film is prepared by the following method:
(1) taking 50-60 parts of styrene-isoprene-styrene block copolymer, 10-20 parts of poly alpha-methyl styrene resin, 10-20 parts of ethylene-vinyl acetate copolymer, 5-7 parts of ethylene-1-octene copolymer, 3-5 parts of tackifying resin, 2-4 parts of lauryl acrylate, 2-3 parts of isooctyl acrylate, 1-2 parts of plasticizer, 0.5-1 part of aminopropyltriethoxysilane and 0.5-1 part of antioxidant, and uniformly mixing to obtain a mixture;
(2) placing the mixture in a double-screw extruder, heating for 15-25min at the temperature of 180-190 ℃, and obtaining hot-melt pressure-sensitive adhesive particles after melting, extruding and granulating;
(3) and carrying out tape casting processing on the hot-melt pressure-sensitive adhesive particles at the temperature of 120-130 ℃ to obtain the hot-melt pressure-sensitive adhesive film.
2. The method for preparing the high-pressure-resistant high-overload shielding paper according to claim 1, is characterized in that: the pressure in S3 is 50-60kg/m 2 。
3. The method for preparing the high-pressure-resistant high-overload shielding paper according to claim 1, is characterized in that: the tackifying resin is one of terpene resin and hydrogenated rosin resin or a composite of the terpene resin and the hydrogenated rosin resin.
4. The method for preparing the high-pressure-resistant high-overload shielding paper according to claim 1, is characterized in that: the plasticizer is epoxidized soybean oil.
5. The method for preparing the high-pressure-resistant high-overload shielding paper according to claim 1, is characterized in that: the antioxidant is prepared by mixing tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tri [2, 4-di-tert-butylphenyl ] phosphite in a weight ratio of 4: 1.
6. The method for preparing the high-pressure-resistant high-overload shielding paper according to claim 1, is characterized in that: the temperature of each section of the double-screw extruder is 180 ℃ in the first zone, 180 ℃ in the second zone, 185 ℃ in the third zone, 190 ℃ in the fourth zone, 180 ℃ in the fifth zone and 180 ℃ in the sixth zone.
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