CN111439002A - Antistatic high-temperature-resistant silica gel pad and preparation method thereof - Google Patents

Antistatic high-temperature-resistant silica gel pad and preparation method thereof Download PDF

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CN111439002A
CN111439002A CN202010325752.0A CN202010325752A CN111439002A CN 111439002 A CN111439002 A CN 111439002A CN 202010325752 A CN202010325752 A CN 202010325752A CN 111439002 A CN111439002 A CN 111439002A
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silica gel
layer
antistatic
gel pad
temperature
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史雪芳
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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
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/045—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber 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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    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/16—Layered products comprising a layer of natural or synthetic rubber comprising polydienes homopolymers or poly-halodienes homopolymers
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    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/15—Nano-sized carbon materials
    • C01B32/158—Carbon nanotubes
    • C01B32/168—After-treatment
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
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    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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Abstract

The invention discloses an anti-static high-temperature-resistant silica gel pad and a preparation method thereof. The antistatic high-temperature-resistant silica gel pad provided by the invention is provided with an antistatic layer and a temperature-resistant layer: the antistatic layer adopts polyether acrylate as a base material, sodium alkylsulfonate is added as an antistatic agent, and modified carbon nanotubes with improved mechanical property and electrical property after modification are added, so that the double functions of electric conduction and capacity promotion of the modified carbon nanotubes are exerted, the agglomeration phenomenon is effectively reduced, the dispersion of the sodium alkylsulfonate in the polyether acrylate and the binding force of the sodium alkylsulfonate with the base material are improved, and the whole antistatic layer is enhanced; the temperature-resistant layer is made of ethylene propylene diene monomer rubber and a powder additive, the powder additive further improves the thermal stability of the ethylene propylene diene monomer rubber, the integral temperature resistance of the silica gel pad can be obviously improved, and meanwhile the aging resistance can be improved.

Description

Antistatic high-temperature-resistant silica gel pad and preparation method thereof
Technical Field
The invention relates to the technical field of silica gel products, in particular to an anti-static high-temperature-resistant silica gel pad and a preparation method thereof.
Background
The silica gel pad is a product with more market demands in silica gel products, has certain tension, flexibility, excellent insulativity and pressure resistance, stable chemical property, environmental protection, safety and no peculiar smell, is insoluble in water and any solvent, and is a high-activity green product. In addition, silica gel gaskets are also widely used in the field of electronic products, such as filling between a circuit board and a heat sink, filling between an IC and a heat sink or a product housing, or as a cushion pad for machine connection in industry, and have functions of friction resistance and sealing.
However, the silica gel pad currently used in the electronic product field has two defects, namely, the anti-static and high temperature resistant effects are common. Static electricity is generated in the production, transportation and use processes of electronic products carelessly, and the static electricity can cause electronic components and electronic products to be burnt; in addition, many electronic products can heat up in the use process, which requires that the silica gel pad has better high temperature resistance, otherwise, the normal work of the electronic products can be influenced.
Disclosure of Invention
The invention aims to provide an anti-static high-temperature-resistant silica gel pad and a preparation method thereof, which solve the defects of poor anti-static and high-temperature-resistant performances of the existing silica gel pad for electronic products.
The invention realizes the purpose through the following technical scheme:
an antistatic high temperature resistant silica gel pad, the silica gel pad comprises
A silica gel base layer,
the antistatic layer covers one surface of the silica gel base layer, and is prepared by mixing sodium alkyl sulfonate accounting for 2-20% of the mass of polyether acrylate and 1-8% of modified carbon nano tubes into the polyether acrylate;
the buffer layer covers the outer surface of the anti-static layer;
the temperature-resistant layer covers the outer surfaces of the silica gel base layer and the buffer layer, and is prepared by mixing powder additives accounting for 12-18% of the mass of the ethylene propylene diene monomer into the ethylene propylene diene monomer.
The further improvement is that the modified carbon nanotube is obtained by adding 4-10 wt% of stearic acid into a metal carbon nanotube and fully stirring to obtain a mixed solution, then carrying out homogenization treatment on the mixed solution by using ultrasonic waves, and then carrying out centrifugation, cleaning, drying and carbonization treatment.
The further improvement is that the buffer layer is made of foaming EVA materials, and the thickness of the buffer layer is not less than 2.5 mm.
The further improvement is that the powder additive is one or more of nano silicon dioxide, nano titanium dioxide and nano aluminum oxide.
The further improvement is that the particle size of the powder additive is 0.1-100 nm.
The further improvement is that the thickness of the antistatic layer is not less than 0.5 mm.
The further improvement is that the thickness of the temperature resistant layer is not less than 1 mm.
A preparation method of an antistatic high-temperature-resistant silica gel pad comprises the following steps
Step one, preparing a silica gel base layer for later use;
step two, preparing a modified carbon nano tube, mixing polyether acrylate, sodium alkyl sulfonate and the modified carbon nano tube to obtain a mixed solution, performing ultrasonic dispersion on the mixed solution to obtain an antistatic coating liquid, coating the antistatic coating liquid on one surface of the silica gel base layer by a roll coating method, and performing UV curing to form an antistatic layer;
step three, hot melting and bonding a buffer layer on the surface of the antistatic layer;
and step four, mixing the powder additive into the ethylene propylene diene monomer solution, uniformly stirring, curing to obtain a temperature-resistant layer, and bonding the temperature-resistant layer to the outer surface of the buffer layer and the uncoated surface of the silica gel base layer through hot melting.
The further improvement is that the preparation method of the modified carbon nano tube comprises the following steps: adding 4-10 wt% of stearic acid into a metal carbon nanotube, fully stirring to obtain a mixed solution, homogenizing the mixed solution by using ultrasonic, and then centrifuging, cleaning, drying and carbonizing to obtain the modified carbon nanotube.
The invention has the beneficial effects that: the antistatic high-temperature-resistant silica gel pad provided by the invention is provided with an antistatic layer and a temperature-resistant layer: the antistatic layer adopts polyether acrylate as a base material, sodium alkylsulfonate is added as an antistatic agent, and modified carbon nanotubes with improved mechanical property and electrical property after modification are added, so that the double functions of electric conduction and capacity promotion of the modified carbon nanotubes are exerted, the agglomeration phenomenon is effectively reduced, the dispersion of the sodium alkylsulfonate in the polyether acrylate and the binding force of the sodium alkylsulfonate with the base material are improved, and the whole antistatic layer is enhanced; the temperature-resistant layer is made of ethylene propylene diene monomer rubber and a powder additive, the powder additive further improves the thermal stability of the ethylene propylene diene monomer rubber, the integral temperature resistance of the silica gel pad can be obviously improved, and meanwhile the aging resistance can be improved.
Detailed Description
The present application is described in further detail below with reference to examples, and it should be noted that the following detailed description is provided for further explanation of the present application and should not be construed as limiting the scope of the present application, and that certain insubstantial modifications and adaptations of the present application may be made by those skilled in the art based on the above-mentioned disclosure.
Example 1
The utility model provides an prevent high temperature resistant silica gel pad of static, the silica gel pad includes:
a silica gel base layer of 5mm thickness;
the antistatic layer is 0.5mm thick, covers one surface of the silica gel substrate, and is prepared by mixing sodium alkyl sulfonate accounting for 2% of the mass of polyether acrylate and 1% of modified carbon nano tubes into the polyether acrylate;
the buffer layer with the thickness of 2.5mm covers the outer surface of the anti-static layer, and is made of a foaming EVA material;
the temperature-resistant layer with the thickness of 1mm covers the outer surfaces of the silica gel base layer and the buffer layer, the temperature-resistant layer is prepared by mixing nano silicon dioxide powder accounting for 12% of the mass of the ethylene propylene diene monomer into the ethylene propylene diene monomer, and the particle size of the powder is 0.1 nm.
The preparation method of the silica gel pad comprises the following steps:
step one, preparing a silica gel base layer for later use;
step two, adding 4 wt% of stearic acid into the metal type carbon nano tube, fully stirring to obtain a mixed solution, then carrying out homogenization treatment on the mixed solution by using ultrasonic, then carrying out centrifugation, cleaning, drying and carbonization treatment to obtain a modified carbon nano tube, mixing polyether acrylate, sodium alkyl sulfonate and the modified carbon nano tube to obtain a mixed solution, carrying out ultrasonic dispersion on the mixed solution to obtain an antistatic coating liquid, coating the antistatic coating liquid on one surface of the silica gel base layer by using a roll coating method, and then carrying out UV curing to form an antistatic layer;
step three, hot melting and bonding a buffer layer on the surface of the antistatic layer;
and step four, mixing the powder additive into the ethylene propylene diene monomer solution, uniformly stirring, curing to obtain a temperature-resistant layer, and bonding the temperature-resistant layer to the outer surface of the buffer layer and the uncoated surface of the silica gel base layer through hot melting.
Example 2
The utility model provides an prevent high temperature resistant silica gel pad of static, the silica gel pad includes:
a silica gel base layer of 5mm thickness;
the antistatic layer is 0.8mm thick, covers one surface of the silica gel substrate, and is prepared by mixing sodium alkyl sulfonate accounting for 10% of the mass of polyether acrylate and 5% of modified carbon nano tubes in the polyether acrylate;
the buffer layer with the thickness of 3mm covers the outer surface of the anti-static layer, and is made of a foaming EVA material;
the temperature-resistant layer is 1.5mm thick, the temperature-resistant layer covers the outer surfaces of the silica gel base layer and the buffer layer, the temperature-resistant layer is prepared by mixing ethylene propylene diene monomer with nano titanium dioxide powder accounting for 15% of the mass of the ethylene propylene diene monomer, and the particle size of the powder is 50 nm.
The preparation method of the silica gel pad comprises the following steps:
step one, preparing a silica gel base layer for later use;
adding 7 wt% of stearic acid into the metal type carbon nano tube, fully stirring to obtain a mixed solution, homogenizing the mixed solution by using ultrasonic, centrifuging, cleaning, drying and carbonizing to obtain a modified carbon nano tube, mixing polyether acrylate, sodium alkyl sulfonate and the modified carbon nano tube to obtain a mixed solution, performing ultrasonic dispersion on the mixed solution to obtain an antistatic coating liquid, coating the antistatic coating liquid on one surface of the silica gel base layer by using a roll coating method, and performing UV (ultraviolet) curing to form an antistatic layer;
step three, hot melting and bonding a buffer layer on the surface of the antistatic layer;
and step four, mixing the powder additive into the ethylene propylene diene monomer solution, uniformly stirring, curing to obtain a temperature-resistant layer, and bonding the temperature-resistant layer to the outer surface of the buffer layer and the uncoated surface of the silica gel base layer through hot melting.
Example 3
The utility model provides an prevent high temperature resistant silica gel pad of static, the silica gel pad includes:
a silica gel base layer of 5mm thickness;
the antistatic layer is 0.8mm thick, covers one surface of the silica gel substrate, and is prepared by mixing sodium alkyl sulfonate accounting for 20% of the mass of polyether acrylate and 8% of modified carbon nano tubes in the polyether acrylate;
the buffer layer with the thickness of 3mm covers the outer surface of the anti-static layer, and is made of a foaming EVA material;
the temperature-resistant layer is 1.6mm thick, covers the surface at silica gel basic unit and buffer layer, and the temperature-resistant layer is mixed by mixing ethylene propylene diene monomer with the nanometer aluminium sesquioxide powder that accounts for 18% of ethylene propylene diene monomer quality, and the powder particle size is 100 nm.
The preparation method of the silica gel pad comprises the following steps:
step one, preparing a silica gel base layer for later use;
step two, adding 10 wt% of stearic acid into the metal type carbon nano tube, fully stirring to obtain a mixed solution, then carrying out homogenization treatment on the mixed solution by using ultrasonic waves, carrying out centrifugation, cleaning, drying and carbonization treatment to obtain a modified carbon nano tube, mixing polyether acrylate, sodium alkyl sulfonate and the modified carbon nano tube to obtain a mixed solution, carrying out ultrasonic dispersion on the mixed solution to obtain an antistatic coating liquid, coating the antistatic coating liquid on one surface of the silica gel base layer by using a roll coating method, and carrying out UV curing to form an antistatic layer;
step three, hot melting and bonding a buffer layer on the surface of the antistatic layer;
and step four, mixing the powder additive into the ethylene propylene diene monomer solution, uniformly stirring, curing to obtain a temperature-resistant layer, and bonding the temperature-resistant layer to the outer surface of the buffer layer and the uncoated surface of the silica gel base layer through hot melting.
Comparative example 1
The antistatic silicone rubber pad is basically the same as the silicone rubber pad in the example 2, and the only difference is that the antistatic layer is formed by mixing sodium alkyl sulfonate accounting for 15 percent of the mass of polyether acrylate into the polyether acrylate, and modified carbon nano tubes are not added.
Comparative example 2
The same as the silica gel pad in example 2, except that the modified carbon nanotubes are not added to the antistatic layer, but the ordinary metal carbon nanotubes are added.
Comparative example 3
The same as the silica gel pad of example 2, except that ethoxylated alkylamine was used in place of sodium alkylsulfonate in the antistatic layer.
Comparative example 4
Essentially the same as the silicone pad of example 2, except that the temperature resistant layer is made entirely of ethylene propylene diene monomer.
In order to verify the feasibility and the effect of the invention, the performance of the above examples and comparative examples were tested, and the temperature resistance (the highest temperature that the surface can bear), the conductivity and the antistatic rating (the higher the rating, the better the antistatic effect), were respectively tested, and the results are shown in table one:
table one: results of performance testing
Temperature resistance (. degree. C.) Conductivity (S/cm) Antistatic rating
Example 1 145.3 2.1 5
Example 2 153.6 2.2 5
Example 3 150.1 1.9 5
Comparative example 1 147.2 0.8 3
Comparative example 2 143.6 1.2 4
Comparative example 3 152.9 1.3 4
Comparative example 4 118.8 2.1 5
As can be seen from the above table, the polyether acrylate, the alkyl sodium sulfonate and the modified carbon nanotube in the antistatic layer are used together, so that the antistatic performance can reach the best, and particularly, the modified carbon nanotube has an obvious promotion effect on the fusion and the electric conduction of the alkyl sodium sulfonate, which cannot be presented by other antistatic agents, and the promotion effect of the modified carbon nanotube is more prominent compared with that of a common metal carbon nanotube; in the temperature resistant layer, the powder additive is added to obviously improve the temperature resistance of the ethylene propylene diene monomer.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims (9)

1. The utility model provides an prevent static high temperature resistant silica gel pad which characterized in that: the silica gel pad comprises
A silica gel base layer,
the antistatic layer covers one surface of the silica gel base layer, and is prepared by mixing sodium alkyl sulfonate accounting for 2-20% of the mass of polyether acrylate and 1-8% of modified carbon nano tubes into the polyether acrylate;
the buffer layer covers the outer surface of the anti-static layer;
the temperature-resistant layer covers the outer surfaces of the silica gel base layer and the buffer layer, and is prepared by mixing powder additives accounting for 12-18% of the mass of the ethylene propylene diene monomer into the ethylene propylene diene monomer.
2. The antistatic high temperature resistant silica gel pad according to claim 1, characterized in that: the modified carbon nanotube is obtained by adding 4-10 wt% of stearic acid into a metal carbon nanotube and fully stirring to obtain a mixed solution, then carrying out homogenization treatment on the mixed solution by using ultrasonic waves, and then carrying out centrifugation, cleaning, drying and carbonization treatment.
3. The antistatic high temperature resistant silica gel pad according to claim 1, characterized in that: the buffer layer is made by foaming EVA material, and the thickness of buffer layer is not less than 2.5 mm.
4. The antistatic high temperature resistant silica gel pad according to claim 1, characterized in that: the powder additive is one or more of nano silicon dioxide, nano titanium dioxide and nano aluminum oxide.
5. The anti-static high temperature resistant silica gel pad according to claim 4, wherein: the particle size of the powder additive is 0.1-100 nm.
6. The antistatic high temperature resistant silica gel pad according to claim 1, characterized in that: the thickness of the antistatic layer is not less than 0.5 mm.
7. The antistatic high temperature resistant silica gel pad according to claim 1, characterized in that: the thickness of the temperature-resistant layer is not less than 1 mm.
8. The preparation method of the antistatic high-temperature-resistant silica gel pad as claimed in any one of claims 1 to 7, characterized in that: comprises the steps of
Step one, preparing a silica gel base layer for later use;
step two, preparing a modified carbon nano tube, mixing polyether acrylate, sodium alkyl sulfonate and the modified carbon nano tube to obtain a mixed solution, performing ultrasonic dispersion on the mixed solution to obtain an antistatic coating liquid, coating the antistatic coating liquid on one surface of the silica gel base layer by a roll coating method, and performing UV curing to form an antistatic layer;
step three, hot melting and bonding a buffer layer on the surface of the antistatic layer;
and step four, mixing the powder additive into the ethylene propylene diene monomer solution, uniformly stirring, curing to obtain a temperature-resistant layer, and bonding the temperature-resistant layer to the outer surface of the buffer layer and the uncoated surface of the silica gel base layer through hot melting.
9. The method for preparing the antistatic high-temperature-resistant silica gel pad according to claim 8, characterized in that: the preparation method of the modified carbon nano tube comprises the following steps: adding 4-10 wt% of stearic acid into a metal carbon nanotube, fully stirring to obtain a mixed solution, homogenizing the mixed solution by using ultrasonic, and then centrifuging, cleaning, drying and carbonizing to obtain the modified carbon nanotube.
CN202010325752.0A 2020-04-23 2020-04-23 Antistatic high-temperature-resistant silica gel pad and preparation method thereof Pending CN111439002A (en)

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