CN113249075A - Sealant composition, silane modified polyether sealant and preparation method thereof - Google Patents
Sealant composition, silane modified polyether sealant and preparation method thereof Download PDFInfo
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J171/00—Adhesives based on polyethers obtained by reactions forming an ether link in the main chain; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
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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
- 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
- C09J11/08—Macromolecular additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/22—Expandable microspheres, e.g. Expancel®
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2371/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
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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
- 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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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/18—Spheres
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Abstract
The invention provides a sealant composition, a silane modified polyether sealant and a preparation method thereof, belonging to the field of sealants and specifically comprising 100 parts by mass of silane modified polyether, 30-60 parts by mass of plasticizer, 160 parts by mass of filler, 0.2-2 parts by mass of expandable microspheres, 0.5-5 parts by mass of thixotropic agent, 0.01-2 parts by mass of water removing agent, 0.5-3 parts by mass of coupling agent, 0.1-2 parts by mass of catalyst, 0.01-1 part by mass of antioxidant and 0.01-1 part by mass of ultraviolet absorbent, wherein the silane modified polyether is a silane end-capped prepolymer synthesized by hydrosilicon and unsaturated bond end-capped polyether under the action of the catalyst. Through the processing scheme of this application, show the density that reduces sealed glue, the sealed glue of being convenient for is stored and is transported, reduces production and cost of transportation.
Description
Technical Field
The invention relates to the field of sealants, in particular to a sealant composition, a silane modified polyether sealant and a preparation method thereof.
Background
The silane modified polyether sealant is prepared by taking polyether as a main chain and siloxane-terminated silane-terminated polyether as a basic polymer. The silane modified polyether sealant inherits the advantages and the advantages of the silicone sealant and the polyurethane sealant, and has the advantages of excellent weather resistance, durability, high deformation displacement resistance, good adhesion, coating property, environmental friendliness, low pollution, low viscosity, excellent operability and the like. The silane modified polyether sealant is developed by Japan from 1979, is popular in developed countries such as Europe and America and the like, but is applied later in China and has not mature technology, so that the silane modified polyether sealant becomes an important direction for the development of novel sealants in China. The current sealant on the market has high density and heavy weight, is very inconvenient to store, transport and process, and greatly increases the cost and energy consumption, so the light weight is an important development direction of the sealant.
Disclosure of Invention
Therefore, in order to overcome the defects of the prior art, the invention provides the sealant composition, the silane modified polyether sealant and the preparation method thereof, wherein the sealant composition can obviously reduce the density of the sealant, is convenient to store and transport, reduces the production and transportation cost, and has good heat insulation and sound insulation effects.
In order to achieve the purpose, the invention provides a sealant composition which comprises, by mass, 100 parts of silane modified polyether, 30-60 parts of plasticizer, 120-160 parts of modified filler, 0.2-2 parts of expandable microspheres, 0.5-5 parts of thixotropic agent, 0.01-2 parts of water removing agent, 0.5-3 parts of coupling agent, 0.1-2 parts of catalyst, 0.01-1 part of antioxidant and 0.01-1 part of ultraviolet absorbent, wherein the silane modified polyether is a silane end-capping prepolymer synthesized by hydrosilicon and unsaturated bond end-capping polyether under the action of the catalyst.
In one embodiment, the modified filler is obtained by modifying the surface polarity of the filler, improving the dispersibility of the filler and improving the compatibility with a polymer matrix, and the modified filler is obtained by modifying the surface of the filler by using a filler modifier.
In one embodiment, the surface modification method of the modified filler comprises the steps of stirring 100 parts by mass of the filler at a high speed at 70-90 ℃ for 10-15min, adding 0.1-3 parts by mass of the filler modifier, and continuing stirring for 30-40min to obtain the modified filler.
In one embodiment, the filler is at least one of silica, calcium carbonate, talc, kaolin, bentonite, carbon black, fine quartz powder, mica powder, aluminum hydroxide, magnesium hydroxide, melamine polyphosphate, zinc oxide, aluminum oxide, barium sulfate, diatomaceous earth, and titanium dioxide.
In one embodiment, the filler modifier is at least one of lauric acid, an aluminate coupling agent, stearic acid, sodium lauryl sulfate, oleic acid, sodium stearate, zinc stearate, sodium lauryl sulfate, maleic anhydride, and a silane coupling agent.
In one embodiment, the expandable microspheres have a particle size of 15-25 μm, an initiation temperature of 80-105 ℃, a foaming peak temperature of 125-158 ℃, and a minimum foaming density of no more than 15kg/m3。
In one embodiment, the catalyst is at least one of dibutyltin dilaurate, tin octoate, laurylamine, and dibutyltin bis (acetylacetonate).
In one embodiment, the antioxidant is a hindered phenolic antioxidant.
In one embodiment, the ultraviolet absorber is at least one of benzotriazole ultraviolet absorbers, salicylate ultraviolet absorbers, benzophenone ultraviolet absorbers, substituted acrylonitrile ultraviolet absorbers, and triazine ultraviolet absorbers.
In one embodiment, the expandable microspheres are shells formed by polymers and internally contain volatile expanding agents serving as core agents, the shells are formed by polymerizing monomer mixtures of polymerizable monomers, and the polymerizable monomers are at least one of acrylonitrile, acrylate monomers, acrylamide monomers and acrylic monomers.
In one embodiment, the core agent is a low boiling point hydrocarbon having a boiling point not higher than that of the shell, and the core agent is at least one of n-pentane, isopentane, neopentane, butane, isobutane, hexane, isohexane, neohexane, heptane, isoheptane, octane, isooctane, and petroleum ether.
The invention also provides a preparation method of the silane modified polyether sealant, which comprises the following steps: decompressing and dehydrating 100 parts of silane modified polyether, 30-60 parts of plasticizer and 160 parts of 120-fluid modified filler for 2 hours at the vacuum degree of 100-fluid 110 ℃ and the vacuum degree of 0.1MPa, cooling to 60 ℃, adding 0.2-2 parts of expandable microspheres, uniformly stirring, heating to 90-150 ℃, keeping for 0.5-5min, and cooling to room temperature; sequentially adding 0.5-5 parts of thixotropic agent, 0.01-2 parts of water removing agent, 0.5-3 parts of coupling agent, 0.1-2 parts of catalyst, 0.01-1 part of antioxidant and 0.01-1 part of ultraviolet absorbent, and stirring for 0.5-1.5h under the vacuum degree of 0.1MPa to obtain the low-density silane modified polyether sealant.
The invention also provides a silane modified polyether sealant which is prepared by the preparation method of the silane modified polyether sealant.
Compared with the prior art, the invention has the advantages that: the expandable microspheres with large volume and small mass are used as light fillers, different densities can be achieved simply through process regulation, an excellent weight reduction effect can be achieved by adding a small amount of the expandable microspheres, the process is simple, the sealant density is remarkably reduced, and the production and transportation cost is greatly reduced. And the expanded microspheres are used as light fillers, have good compatibility with a sealant system, and can be in a stable state for a long time. The expandable microspheres are added when not expanded, the density of the expandable microspheres is similar to that of other materials in a system, the dispersibility is better, and the hollow expandable microspheres obtained after reaction can also enable the sealant to have certain heat and sound insulation effects, so that the energy consumption is effectively reduced.
Detailed Description
The following describes embodiments of the present application in detail.
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number and aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that aspects may be practiced without these specific details.
All parts in the examples are parts by mass in the present application and are not further claimed hereinafter.
The embodiment of the application provides a sealant composition which comprises, by mass, 100 parts of silane modified polyether, 30-60 parts of plasticizer, 160 parts of modified filler, 0.2-2 parts of expandable microspheres, 0.5-5 parts of thixotropic agent, 0.01-2 parts of water removing agent, 0.5-3 parts of coupling agent, 0.1-2 parts of catalyst, 0.01-1 part of antioxidant and 0.01-1 part of ultraviolet absorbent.
The silane modified polyether is a silane terminated prepolymer synthesized by hydrosilicon and unsaturated bond terminated polyether under the action of a catalyst, has excellent weather resistance and durability, high deformation displacement resistance, good adhesion, good coating property, environment friendliness, good construction property and low fouling property. The silane polyether can be at least one of methyl dimethoxy silane terminated polyether, triethoxy silane mixed terminated polyether and trimethoxy silane terminated polyether.
In one embodiment, the modified filler is obtained by modifying the surface of the filler by a filler modifier, so that the dispersibility of the modified filler is improved, and the compatibility of the modified filler with a polymer matrix is improved. In one embodiment, the surface modification method of the modified filler comprises the steps of stirring 100 parts by mass of the filler at a high speed at 70-90 ℃ for 10-15min, adding 0.1-3 parts by mass of the filler modifier, and continuing stirring for 30-40min to obtain the modified filler.
In one embodiment, the filler is at least one of silica, calcium carbonate, talc, kaolin, bentonite, carbon black, fine quartz powder, mica powder, aluminum hydroxide, magnesium hydroxide, melamine polyphosphate, zinc oxide, aluminum oxide, barium sulfate, diatomaceous earth, and titanium dioxide.
The filler modifier has the function of coating a layer of organic matter on the surface of the filler through modification, the surfaces of particles are easy to be wetted by the polymer, and the filler modifier has good compatibility with a matrix, thereby being beneficial to improving the reinforcing effect of the sealant and improving the use process performance of the sealant. In one embodiment, the filler modifier is at least one of lauric acid, aluminate coupling agent, stearic acid, sodium lauryl sulfate, oleic acid, sodium stearate, zinc stearate, sodium lauryl sulfate, maleic anhydride, and silane coupling agent.
In one embodiment, the plasticizer is at least one of dioctyl phthalate, dibutyl phthalate, diisodecyl phthalate, ditridecyl phthalate, epoxy-based plasticizers, and polypropylene glycol monobutyl ether.
The main function of the thixotropic agent is to effectively prevent the rubber compound from sagging, flowing and collapsing when the sealant is constructed on an inclined plane or a vertical plane. In one embodiment, the thixotropic agent is at least one of hydrogenated castor oil, fatty amide, polyamide wax, organobentonite, fumed silica, and organically modified montmorillonite.
In one embodiment, the water scavenger is at least one of vinyltrimethoxysilane, vinyltriethoxysilane, vinyldimethoxysilane, isocyanatosilane, diisobutyl ethertrimethoxysilane, and a monooxazolidine.
The coupling agent is used for further accelerating the vulcanization crosslinking speed of the sealant and reducing the dosage of the catalyst. In one embodiment, the coupling agent is at least one of gamma-aminopropyltriethoxysilane, gamma-aminopropyltrimethoxysilane, N-beta- (aminoethyl) -gamma-aminopropylmethyldimethoxysilane, gamma-ureidopropyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma-glycidoxypropyltriethoxysilane, gamma-mercaptopropyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane, and gamma-methacryloxypropyltrimethoxysilane.
The catalyst has the function of accelerating the vulcanization speed of the silane modified polyether. In one embodiment, the catalyst is at least one of dibutyltin dilaurate, tin octoate, laurylamine, and dibutyltin bis (acetylacetonate).
The antioxidant has the functions of preventing the sealant from deteriorating and aging, improving the storage stability and effectively playing a role for a long time. In one embodiment, the antioxidant is a hindered phenolic antioxidant.
The ultraviolet absorbent has the functions of preventing ultraviolet light from damaging materials, improving stability and prolonging service life. In one embodiment, the ultraviolet absorber is at least one of benzotriazole ultraviolet absorbers, salicylate ultraviolet absorbers, benzophenone ultraviolet absorbers, substituted acrylonitrile ultraviolet absorbers, and triazine ultraviolet absorbers.
In one embodiment, the expandable microspheres are shells formed by polymers and internally contain volatile expanding agents serving as core agents, the shells are formed by polymerizing monomer mixtures of polymerizable monomers, and the polymerizable monomers are at least one of acrylonitrile, acrylate monomers, acrylamide monomers and acrylic monomers.
The expandable microspheres may be those produced by kurari technologies (shanghai) ltd. The specific models and technical indexes available are as follows:
in one embodiment, the core agent is a low boiling point hydrocarbon having a boiling point not higher than that of the shell, and the core agent is at least one of n-pentane, isopentane, neopentane, butane, isobutane, hexane, isohexane, neohexane, heptane, isoheptane, octane, isooctane, and petroleum ether.
The embodiment of the application also provides a preparation method of the silane modified polyether sealant, which comprises the following steps:
decompressing and dehydrating 100 parts of silane modified polyether, 30-60 parts of plasticizer and 160 parts of 120-fluid modified filler for 2 hours at the vacuum degree of 100-fluid 110 ℃ and the vacuum degree of 0.1MPa, cooling to 60 ℃, adding 0.2-2 parts of expandable microspheres, uniformly stirring, heating to 90-150 ℃, keeping for 0.5-5min, and cooling to room temperature;
sequentially adding 0.5-5 parts of thixotropic agent, 0.01-2 parts of water removing agent, 0.5-3 parts of coupling agent, 0.1-2 parts of catalyst, 0.01-1 part of antioxidant and 0.01-1 part of ultraviolet absorbent, and stirring for 0.5-1.5h under the vacuum degree of 0.1MPa to obtain the low-density silane modified polyether sealant.
The embodiment of the application also provides a silane modified polyether sealant, which is prepared by adopting the preparation method of the silane modified polyether sealant.
According to the silane modified polyether sealant and the preparation method thereof, the expandable microspheres with large volume and small mass are used as the light filler, different densities are achieved simply through process regulation, an excellent weight reduction effect can be achieved by adding a small amount of the expandable microspheres, the process is simple, the sealant density is remarkably reduced, and the production and transportation costs are greatly reduced. And the expanded microspheres are used as light fillers, have good compatibility with a sealant system, and can be in a stable state for a long time. The expandable microspheres are added when not expanded, the density of the expandable microspheres is similar to that of other materials in a system, the dispersibility is better, and the hollow expandable microspheres obtained after reaction can also enable the sealant to have certain heat and sound insulation effects, so that the energy consumption is effectively reduced.
Example one
100 parts of triethoxy-terminated silane modified polyether 12000E, 30 parts of dioctyl phthalate and 145 parts of stearic acid modified calcium carbonate are dehydrated under reduced pressure at 110 ℃ and the vacuum degree of 0.1MPa for 2 hours, cooled to 60 ℃, added with 0.2 part of expandable microspheres, stirred uniformly, heated to 90 ℃, kept for 5min and cooled to room temperature;
and sequentially adding 5 parts of hydrogenated castor oil, 0.01 part of diisobutyl ether trimethoxy silane, 0.5 part of gamma-aminopropyl triethoxy silane, 0.1 part of dibutyltin bis (acetyl acetonate), 0.01 part of IRGANOX 1010 and 0.1 part of resorcinol monobenzoate, and stirring for 0.5h under the vacuum degree of 0.1MPa to obtain the low-density silane modified polyether sealant. The triethoxy terminated silane modified polyether is modified polyether produced by Jiangsu Riyangtai New Material science and technology Limited, and 12000E is the product number of the product in the department of commerce. IRGANOX 1010 is a Pasteur antioxidant, and specifically can be pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ].
Comparative example 1
100 parts of triethoxy-terminated silane modified polyether 12000E, 30 parts of dioctyl phthalate and 145 parts of stearic acid modified calcium carbonate are dehydrated for 2 hours under the vacuum degree of 0.1MPa at 110 ℃, and cooled to room temperature;
and sequentially adding 5 parts of hydrogenated castor oil, 0.01 part of diisobutyl ether trimethoxy silane, 0.5 part of gamma-aminopropyl triethoxy silane, 0.1 part of dibutyltin bis (acetyl acetonate), 0.01 part of IRGANOX 1010 and 0.1 part of resorcinol monobenzoate, and stirring for 0.5h under the vacuum degree of 0.1MPa to obtain the silane modified polyether sealant serving as a control.
Example two
80 parts of methyl dimethoxy terminated silane modified polyether S203H, 20 parts of methyl dimethoxy terminated silane modified polyether S303H, 55 parts of polypropylene glycol monobutyl ether, 120 parts of oleic acid modified calcium carbonate and 40 parts of oleic acid modified silicon dioxide are dehydrated for 2 hours under reduced pressure at 110 ℃ and under the vacuum degree of 0.1MPa, cooled to 60 ℃, added with 1 part of expandable microspheres, stirred uniformly, heated to 110 ℃, kept for 3min and cooled to room temperature;
and sequentially adding 3 parts of fumed silica, 0.5 part of vinyl dimethoxysilane, 1 part of N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, 0.5 part of laurylamine, 0.1 part of IRGANOX 1076 and 0.01 part of 2-hydroxy-4-methoxybenzophenone, and stirring for 1h under the vacuum degree of 0.1MPa to obtain the low-density silane modified polyether sealant. The methyl dimethoxy terminated silane modified polyether is produced by Japanese Brillouin chemistry, and S203H is the product number of the product sold in the department of commerce. IRGANOX 1076 is a Pasteur antioxidant, specifically n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
Comparative example No. two
80 parts of methyldimethoxysilane modified polyether S203H, 20 parts of methyldimethoxysilane modified polyether S303H, 55 parts of polypropylene glycol monobutyl ether, 120 parts of oleic acid modified calcium carbonate and 40 parts of oleic acid modified silicon dioxide are dehydrated for 2 hours under the vacuum degree of 0.1MPa at 110 ℃, and cooled to room temperature;
and 3 parts of fumed silica, 0.5 part of vinyl dimethoxysilane, 1 part of N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, 0.5 part of laurylamine, 0.1 part of IRGANOX 1076 and 0.01 part of 2-hydroxy-4-methoxybenzophenone are sequentially added, and the mixture is stirred for 1 hour under the vacuum degree of 0.1MPa to obtain the silane modified polyether sealant serving as a control.
EXAMPLE III
60 parts of methoxy-terminated silane modified polyether EXCESTER S2410E, 40 parts of methoxy-terminated silane modified polyether EXCESTER S2420E, 45 parts of dibutyl phthalate and 130 parts of kaolin modified by an aluminate coupling agent are dehydrated under reduced pressure at 100 ℃ and under the vacuum degree of 0.1MPa for 2 hours, the mixture is cooled to 60 ℃, 1.5 parts of expandable microspheres are added, the mixture is uniformly stirred, the temperature is raised to 130 ℃, the mixture is kept for 2 minutes, and the temperature is reduced to room temperature;
sequentially adding 1 part of organobentonite, 1 part of vinyltriethoxysilane, 2 parts of gamma-glycidoxypropyltrimethoxysilane, 1 part of tin octylate, 1 part of IRGANOX 1098 and 0.5 part of ethylhexyl salicylate, and stirring for 1h under the vacuum degree of 0.1MPa to obtain the low-density silane modified polyether sealant. The methoxy-terminated silane modified polyether is produced by Asahi Glass (AGC) company, and EXCESTAR S2410E is a product of the product, namely a product sold by the company of Japan and Asahi Glass (AGC). IRGANOX 1098 is a Pasteur antioxidant, and specifically N, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine.
Comparative example No. three
60 parts of methoxy-terminated silane modified polyether EXCESTER S2410E, 40 parts of methoxy-terminated silane modified polyether EXCESTER S2420E, 45 parts of dibutyl phthalate and 130 parts of kaolin modified by an aluminate coupling agent are dehydrated for 2 hours under the vacuum degree of 0.1MPa at 100 ℃, and then cooled to room temperature;
sequentially adding 1 part of organobentonite, 1 part of vinyltriethoxysilane, 2 parts of gamma-glycidoxypropyltrimethoxysilane, 1 part of tin octylate, 1 part of IRGANOX 1098 and 0.5 part of ethylhexyl salicylate, and stirring for 1h under the vacuum degree of 0.1MPa to obtain the silane modified polyether sealant as a control.
Example four
100 parts of trimethoxy terminated silane modified polyether SAX510, 60 parts of diisodecyl phthalate, 100 parts of sodium dodecyl sulfate modified bentonite and 20 parts of sodium dodecyl sulfate modified carbon black are dehydrated under reduced pressure at 100 ℃ and under the vacuum degree of 0.1MPa for 2 hours, cooled to 60 ℃, added with 2 parts of expandable microspheres, stirred uniformly, heated to 150 ℃, kept for 0.5min and cooled to room temperature;
and sequentially adding 0.5 part of polyamide wax, 2 parts of vinyltrimethoxysilane, 3 parts of gamma-mercaptopropyltriethoxysilane, 2 parts of dibutyltin dilaurate, 0.5 part of IRGANOX 245 and 1 part of 2- (2-hydroxy-2-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, and stirring for 1.5h under the vacuum degree of 0.1MPa to obtain the low-density silane modified polyether sealant. The trimethoxy terminated silane modified polyether is produced by Japanese Brillouin chemistry, and SAX510 is the product number of the product in the department of commerce. IRGANOX 245 is a Pasteur antioxidant, and specifically may be triethylene glycol bis [ beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate ].
Comparative example No. four
100 parts of trimethoxy terminated silane modified polyether SAX510, 60 parts of diisodecyl phthalate, 100 parts of sodium dodecyl sulfate modified bentonite and 20 parts of sodium dodecyl sulfate modified carbon black are subjected to reduced pressure dehydration for 2 hours at 100 ℃ under the vacuum degree of 0.1MPa, and then cooled to room temperature;
and sequentially adding 0.5 part of polyamide wax, 2 parts of vinyltrimethoxysilane, 3 parts of gamma-mercaptopropyltriethoxysilane, 2 parts of dibutyltin dilaurate, 0.5 part of IRGANOX 245 and 1 part of 2- (2-hydroxy-2-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, and stirring for 1.5h under the vacuum degree of 0.1MPa to obtain the silane modified polyether sealant serving as a reference.
The densities of the sealants obtained in examples 1-4 and comparative examples 1-4 are shown in the following table:
as can be seen from the data in the table, after the expanded microspheres are added, the weight reducing effect of the expanded microspheres in the sealant prepared from different raw materials is different, but the weight reducing effect is obvious. And with the increase of the addition amount of the expanded microspheres, the specific gravity of the sealant can be reduced by 8-49%.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (13)
1. The sealant composition is characterized by comprising 100 parts by mass of silane modified polyether, 30-60 parts by mass of plasticizer, 160 parts by mass of modified filler, 0.2-2 parts by mass of expandable microspheres, 0.5-5 parts by mass of thixotropic agent, 0.01-2 parts by mass of water removing agent, 0.5-3 parts by mass of coupling agent, 0.1-2 parts by mass of catalyst, 0.01-1 part by mass of antioxidant and 0.01-1 part by mass of ultraviolet absorbent, wherein the silane modified polyether is a silane end-capping prepolymer synthesized by hydrosilicon and unsaturated bond end-capping polyether under the action of the catalyst.
2. The sealant composition of claim 1 wherein the modified filler is obtained by modifying the surface of the filler with a filler modifier to improve its dispersibility and compatibility with the polymer matrix by changing the polarity of the surface of the filler.
3. The sealant composition of claim 2, wherein the surface modification method of the modified filler is to stir 100 parts by mass of the filler at a high speed for 10-15min at 70-90 ℃, add 0.1-3 parts by mass of the filler modifier, and continue stirring for 30-40min to obtain the modified filler.
4. The sealant composition of claim 3 wherein the filler is at least one of silica, calcium carbonate, talc, kaolin, bentonite, carbon black, fine quartz powder, mica powder, aluminum hydroxide, magnesium hydroxide, melamine polyphosphate, zinc oxide, alumina, barium sulfate, diatomaceous earth, and titanium dioxide.
5. The sealant composition of claim 3 wherein the filler modifier is at least one of lauric acid, aluminate coupling agent, stearic acid, sodium lauryl sulfate, oleic acid, sodium stearate, zinc stearate, sodium lauryl sulfate, maleic anhydride and silane coupling agent.
6. The sealant composition of claim 1 wherein the expandable microspheres have a particle size of 15 to 25 μm, an onset temperature of 80 to 105 ℃, a peak foaming temperature of 125 to 158 ℃, and a minimum foaming density of no greater than 15kg/m3。
7. The sealant composition of claim 1 wherein the catalyst is at least one of dibutyltin dilaurate, tin octoate, laurylamine, and dibutyltin bis (acetylacetonate).
8. The sealant composition of claim 1 wherein said antioxidant is a hindered phenolic antioxidant.
9. The sealant composition of claim 1 wherein said uv absorber is at least one of a benzotriazole-based uv absorber, a salicylate-based uv absorber, a benzophenone-based uv absorber, a substituted acrylonitrile-based uv absorber, and a triazine-based uv absorber.
10. The sealant composition of claim 1 wherein the expandable microspheres are a shell formed of a polymer having a volatile expansion agent encapsulated therein as a core agent, the shell being polymerized from a monomer mixture of polymerizable monomers, the polymerizable monomers being at least one of acrylonitrile, acrylate monomers, acrylamide monomers and acrylic monomers.
11. The sealant composition of claim 10 wherein the wicking agent is a low boiling hydrocarbon having a boiling point no higher than that of the shell and the wicking agent is at least one of n-pentane, isopentane, neopentane, butane, isobutane, hexane, isohexane, neohexane, heptane, isoheptane, octane, isooctane, and petroleum ether.
12. A preparation method of a silane modified polyether sealant is characterized by comprising the following steps:
decompressing and dehydrating 100 parts of silane modified polyether, 30-60 parts of plasticizer and 160 parts of 120-fluid modified filler for 2 hours at the vacuum degree of 100-fluid 110 ℃ and the vacuum degree of 0.1MPa, cooling to 60 ℃, adding 0.2-2 parts of expandable microspheres, uniformly stirring, heating to 90-150 ℃, keeping for 0.5-5min, and cooling to room temperature;
sequentially adding 0.5-5 parts of thixotropic agent, 0.01-2 parts of water removing agent, 0.5-3 parts of coupling agent, 0.1-2 parts of catalyst, 0.01-1 part of antioxidant and 0.01-1 part of ultraviolet absorbent, and stirring for 0.5-1.5h under the vacuum degree of 0.1MPa to obtain the low-density silane modified polyether sealant.
13. A silane-modified polyether sealant characterized in that the silane-modified polyether sealant is prepared by the method for preparing the silane-modified polyether sealant according to claim 12.
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