CN112457756A - Insulating coating and preparation method thereof - Google Patents
Insulating coating and preparation method thereof Download PDFInfo
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- CN112457756A CN112457756A CN202011333928.3A CN202011333928A CN112457756A CN 112457756 A CN112457756 A CN 112457756A CN 202011333928 A CN202011333928 A CN 202011333928A CN 112457756 A CN112457756 A CN 112457756A
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- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4054—Mixtures of compounds of group C08G18/60 with other macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/61—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/6505—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6523—Compounds of group C08G18/3225 or C08G18/3271 or polyamines of C08G18/38
- C08G18/6529—Compounds of group C08G18/3225 or polyamines of C08G18/38
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- 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
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention provides an insulating coating material and a preparation method thereof, and specifically relates to a method for preparing a polyurethane prepolymer by adding polydimethylsiloxane and polyisocyanate into a solvent for reaction; and sequentially adding a chain extender containing a disulfide bond and hyperbranched polyamide, heating to 100-120 ℃, reacting for 5-8 hours, adding sulfur and active calcium carbonate, and stirring at 100-120 ℃ for 3-5 hours to obtain the insulating coating material. Intermolecular hydrogen bonds in the polyurethane prepolymer can increase the crosslinking density of the material, and a monomer containing disulfide bonds is used as a chain extender for chain extension, so that the self-repairing organic silicon modified polyurethane containing disulfide bonds and intermolecular hydrogen bonds. The insulating coating material prepared by the invention not only has excellent performances of polyurethane and organic silicon materials, but also can finish a high-efficiency self-repairing process under a mild condition, can automatically repair under heating and UV illumination conditions, and protects the internal structure from being damaged.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to an insulating coating material and a preparation method thereof.
Background
With the development of science and technology, insulation materials and insulation technologies for electrical appliances with different functions are increasingly paid more attention. For some high-end electrical equipment, the insulating material is an indispensable component, the insulating coating material can effectively protect a human body from forming a path with a leakage device, the quality of the insulating coating material is good, and the insulating coating material plays a key role in technical indexes and the service life of the electrical equipment and the life health of people. The insulating coating is mainly used for coils of electric machines and electric appliances and other insulating parts, fills gaps of the insulating coating, and becomes a compact whole after being cured, so that the insulating property, the mechanical property and the weather resistance of the insulating coating are improved. Particularly, along with the continuous development of national economy, the power demand is in a rapid growth trend, and in order to meet the needs of industrial and agricultural products and the living power consumption of people, transformer substations, power distribution cabinets and the like are gradually built in the central area of a city, because the lamp is easy to be irradiated by ultraviolet rays and easy to age in outdoor severe weather all the year round, thereby reducing the service life of the insulating coating, causing partial falling of the insulating coating after long-time use, particularly leading the whole mechanical part to be unusable due to fine falling or damage, and the existing solutions are usually to cover the insulating coating again or replace the whole part, causing great waste, therefore, how to repair the damaged insulating coating becomes an urgent problem to be solved, and the development of the insulating coating with the self-repairing function by simulating the self-repairing mechanism after organism damage becomes an important way for constructing a conservation-oriented society and realizing the sustainable development of the society.
Disclosure of Invention
Aiming at the problems of incomplete repair and resource waste after the insulating coating is damaged in the prior art, the invention provides the insulating coating material and the preparation method thereof.
The invention is realized by the following technical scheme:
an insulating coating material comprises the following raw materials in parts by weight: 40-50 parts of polydimethylsiloxane, 20-30 parts of polyisocyanate, 3-5 parts of sulfur, 10-15 parts of calcium carbonate, 20-30 parts of chain extender containing disulfide bonds, 20-30 parts of hyperbranched polyamide and 40-60 parts of solvent.
Preferably, the polyisocyanate is one or more of hexamethylene diisocyanate, methylene diphenyl diisocyanate and toluene diisocyanate.
Preferably, the calcium carbonate is activated calcium carbonate.
Preferably, the disulfide bond-containing chain extender is one or more of 4,4 ' -diaminodiphenyl disulfide, 4 ' -dihydroxydiphenyl disulfide, 2' -dithiodiethanol, 2' -diaminodiphenyl disulfide, 6' -dihydroxy-2, 2' -dinaphthyl disulfide, and 3,3' -dihydroxydiphenyl disulfide.
Preferably, the solvent is more than one of dimethyl sulfoxide, N-dimethylacetamide and N, N-dimethylformamide.
The preparation method of the insulating coating material comprises the following steps:
(1) adding polydimethylsiloxane into a solvent, stirring and heating to 60-80 ℃, adding polyisocyanate, heating to 100-120 ℃, and reacting for 5-8 hours to obtain a polyurethane prepolymer;
(2) sequentially adding a chain extender containing a disulfide bond and hyperbranched polyamide into the system in the step (1), and heating to 100-120 ℃ for reaction for 5-8 hours;
(3) adding sulfur and activated calcium carbonate into the system reacted in the step (2), and stirring for 3-5 hours at the temperature of 100-120 ℃ to obtain the insulating coating material.
The insulating coating material not only has the excellent performances of polyurethane and organic silicon materials, but also can complete a high-efficiency self-repairing process under mild conditions, can automatically repair under heating and UV illumination conditions, protects the internal structure from being damaged, and in addition, the hyperbranched polyamide contains a large number of primary amine groups at the tail end, has good biocompatibility, enhances the grafting performance among macromolecules, and obtains better material uniformity, the insulating coating is not easy to fall off.
Advantageous effects
(1) The self-repairing organic silicon modified polyurethane with disulfide bonds and intermolecular hydrogen bonds is obtained by introducing the disulfide bonds into the main chain of the organic silicon modified polyurethane and using the disulfide bonds and the intermolecular hydrogen bonds by using the monomer containing the disulfide bonds as a chain extender to carry out chain extension;
(2) the insulating coating material prepared by the invention not only has excellent performances of polyurethane and organic silicon materials, but also can finish a high-efficiency self-repairing process under a mild condition, can automatically repair under the conditions of heating and UV illumination, and protect the internal structure from being damaged;
(3) the hyperbranched polyamide has a great amount of primary amine groups at the tail end, has good biocompatibility, enhances the grafting performance among macromolecules, and obtains a material with better uniformity and an insulating coating which is not easy to fall off.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The parts described in the following examples are parts by weight.
Example 1
(1) Adding 45 parts of polydimethylsiloxane into 50 parts of dimethyl sulfoxide, stirring and heating to 70 ℃, adding dicyclohexylmethane diisocyanate, heating to 110 ℃, and reacting for 6 hours to obtain a polyurethane prepolymer;
(2) adding 25 parts of 4, 4' -diaminodiphenyl disulfide and 25 parts of hyperbranched polyamide into the system in the step (1) in sequence, and heating to 100 ℃ for reaction for 8 hours;
(3) and (3) adding 3 parts of sulfur and 15 parts of activated calcium carbonate into the system reacted in the step (2), and stirring for 3 hours at the temperature of 120 ℃ to obtain the insulating coating material.
Example 2
(1) Adding 40 parts of polydimethylsiloxane into a mixed solvent of 15 parts of N, N-dimethylacetamide and 15 parts of dimethyl sulfoxide, stirring and heating to 70 ℃, adding dicyclohexylmethane diisocyanate, heating to 110 ℃, and reacting for 6 hours to obtain a polyurethane prepolymer;
(2) sequentially adding 20 parts of 2,2' -dithiodiethanol and 25 parts of hyperbranched polyamide into the system in the step (1), and heating to 100 ℃ for reaction for 8 hours;
(3) and (3) adding 5 parts of sulfur and 12 parts of activated calcium carbonate into the system reacted in the step (2), and stirring for 4 hours at the temperature of 110 ℃ to obtain the insulating coating material.
Example 3
(1) Adding 50 parts of polydimethylsiloxane into a mixed solvent of 30 parts of N, N-dimethylacetamide and 20 parts of dimethyl sulfoxide, stirring and heating to 80 ℃, adding dicyclohexylmethane diisocyanate, heating to 120 ℃ and reacting for 5 hours to obtain a polyurethane prepolymer;
(2) sequentially adding 30 parts of 2,2' -dithiodiethanol and 30 parts of hyperbranched polyamide into the system in the step (1), and heating to 120 ℃ for reaction for 6 hours;
(3) and (3) adding 4 parts of sulfur and 15 parts of activated calcium carbonate into the system reacted in the step (2), and stirring for 5 hours at the temperature of 100 ℃ to obtain the insulating coating material.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An insulating coating material is characterized by comprising the following raw materials in parts by weight: 40-50 parts of polydimethylsiloxane, 20-30 parts of polyisocyanate, 3-5 parts of sulfur, 10-15 parts of calcium carbonate, 20-30 parts of chain extender containing disulfide bonds, 20-30 parts of hyperbranched polyamide and 40-60 parts of solvent.
2. The insulating coating material according to claim 1, wherein the polyisocyanate is one or more of hexamethylene diisocyanate, methylene diphenyl diisocyanate, and toluene diisocyanate.
3. The insulating coating material of claim 1, wherein said calcium carbonate is activated calcium carbonate.
4. The insulating coating material according to claim 1, wherein the disulfide bond-containing chain extender is one or more of 4,4 ' -diaminodiphenyl disulfide, 4 ' -dihydroxydiphenyl disulfide, 2' -dithiodiethanol, 2' -diaminodiphenyl disulfide, 6' -dihydroxy-2, 2' -dinaphthyl disulfide, and 3,3' -dihydroxydiphenyl disulfide.
5. The insulating coating material of claim 1, wherein the solvent is one or more of dimethylsulfoxide, N-dimethylacetamide, and N, N-dimethylformamide.
6. A method for preparing an insulating coating material according to any one of claims 1 to 5, comprising the steps of:
(1) adding polydimethylsiloxane into a solvent, stirring and heating to 60-80 ℃, adding polyisocyanate, heating to 100-120 ℃, and reacting for 5-8 hours to obtain a polyurethane prepolymer;
(2) sequentially adding a chain extender containing a disulfide bond and hyperbranched polyamide into the system in the step (1), and heating to 100-120 ℃ for reaction for 5-8 hours;
(3) adding sulfur and activated calcium carbonate into the system reacted in the step (2), and stirring for 3-5 hours at the temperature of 100-120 ℃ to obtain the insulating coating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011333928.3A CN112457756A (en) | 2020-11-25 | 2020-11-25 | Insulating coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011333928.3A CN112457756A (en) | 2020-11-25 | 2020-11-25 | Insulating coating and preparation method thereof |
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| CN112457756A true CN112457756A (en) | 2021-03-09 |
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| CN202011333928.3A Pending CN112457756A (en) | 2020-11-25 | 2020-11-25 | Insulating coating and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117416113A (en) * | 2023-10-11 | 2024-01-19 | 常州佳尔科仿真器材有限公司 | Lightweight multilayer multiband high-reflection TPU composite material for false target |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030176596A1 (en) * | 2002-01-26 | 2003-09-18 | Hannah Kenig-Dodiuk | Dendritically modified polyurethanes |
| CN110563922A (en) * | 2019-09-19 | 2019-12-13 | 四川大学 | Chemical crosslinking type high-performance room-temperature rapid self-repairing flexible material and preparation method and application thereof |
-
2020
- 2020-11-25 CN CN202011333928.3A patent/CN112457756A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030176596A1 (en) * | 2002-01-26 | 2003-09-18 | Hannah Kenig-Dodiuk | Dendritically modified polyurethanes |
| CN110563922A (en) * | 2019-09-19 | 2019-12-13 | 四川大学 | Chemical crosslinking type high-performance room-temperature rapid self-repairing flexible material and preparation method and application thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117416113A (en) * | 2023-10-11 | 2024-01-19 | 常州佳尔科仿真器材有限公司 | Lightweight multilayer multiband high-reflection TPU composite material for false target |
| CN117416113B (en) * | 2023-10-11 | 2024-04-09 | 常州佳尔科仿真器材有限公司 | Lightweight multilayer multiband high-reflection TPU composite material for false target |
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Application publication date: 20210309 |