CN112375538A - Self-leveling silicone sealant and application thereof in caulking of railway ballastless track - Google Patents
Self-leveling silicone sealant and application thereof in caulking of railway ballastless track Download PDFInfo
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- CN112375538A CN112375538A CN202011135894.7A CN202011135894A CN112375538A CN 112375538 A CN112375538 A CN 112375538A CN 202011135894 A CN202011135894 A CN 202011135894A CN 112375538 A CN112375538 A CN 112375538A
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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
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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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
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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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
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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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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- 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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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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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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention relates to the field of high polymer sealing materials, and discloses a self-leveling silicone sealant composition for concrete joints and application of the self-leveling silicone sealant composition in the caulking of ballastless tracks of railways. The single-component self-leveling silicone sealant composition for concrete joints contains alpha, omega-dihydroxy polydimethylsiloxane, dimethyl silicone oil, a reinforcing filler, a chain extender, a cross-linking agent, a water removing agent, a coupling agent and a catalyst. The sealant disclosed by the invention has the advantages of low cost, convenience in construction operation, high elongation, good leveling property and stability in storage.
Description
Technical Field
The invention belongs to the field of high polymer sealing materials, and particularly relates to a high-performance self-leveling silicone sealant and application thereof in caulking of ballastless tracks of railways.
Background
In the ballastless track structure of the high-speed railway, a bed plate, a track bed plate and the like are long-line continuous casting structures, in order to adapt to the deformation of concrete structures in different environments, certain cracks are generated, expansion joints are often required to be arranged at intervals, meanwhile, a large number of seams also exist between a base/supporting layer and an off-line structure, and caulking materials capable of bearing the displacement change of the seams are required to be used so as to prevent moisture, sundries and the like from entering the seams.
The early multi-purpose asphalt is used as a flexible caulking material of a ballastless track of a high-speed railway, but the asphalt material flows at high temperature, becomes brittle at low temperature and has poor aging resistance, and caulking failure appears in a large number after years of service, and the asphalt material is replaced by high-performance sealing materials such as polyurethane, silicone caulking materials and the like.
CN105567153A provides a two-component self-leveling silicone sealant for airport runways, which belongs to the field of concrete joints, and the product has the advantages of high curing speed and adjustable surface dryness, but the product is in a two-component form, special glue mixing equipment needs to be equipped on site, operation steps are increased, the construction is not convenient for single-component glue, the glue is used up within specified time after being mixed, otherwise, the glue is cured in the equipment, and waste and equipment damage are caused. CN105567153A provides a two-component self-leveling silicone sealant for airport runways, which belongs to the field of concrete joints and comprises silicone rubber, methyl silicone oil, pigment carbon black, active white carbon black, active calcium carbonate, heavy active calcium carbonate, methyl tributyl ketoxime silane, vinyl tributyl ketoxime silane, KH-550, KH-560 and dibutyltin dilaurate, wherein each component is a component A and a component B which are independently produced, packaged and stored, and the two-component self-leveling silicone sealant has the remarkable advantages of good performance, long service life, controllable surface drying time and low cost.
However, high performance sealing materials such as silicone caulking materials are damaged to different degrees during application, and the waterproof sealing function is also lost to a certain extent. After the waterproof sealing function of the caulking material fails, water can enter the ballastless track structure from the expansion joint, so that the problems of slurry bleeding, frozen expansion and the like are caused. The failure of the caulking material creates a certain hidden trouble for the durability and the operation safety of a concrete structure, and a high-performance silicone sealant needs to be found to effectively seal the ballastless track of the high-speed railway.
Disclosure of Invention
The invention aims to provide a single-component self-leveling silicone sealant composition and a sealant which are low in cost, convenient to construct and operate, high in elongation, good in leveling property and stable in storage, and application of the single-component self-leveling silicone sealant composition and the sealant in caulking of ballastless tracks of high-speed railways.
In order to achieve the above object, a first aspect of the present invention provides a self-leveling silicone sealant composition for concrete joints, which comprises α, ω -dihydroxy polydimethylsiloxane, dimethicone, a reinforcing filler, a chain extender, a cross-linking agent, a water scavenger, a coupling agent and a catalyst, wherein, relative to 100 parts by weight of α, ω -dihydroxy polydimethylsiloxane, the dimethicone is 10 to 30 parts by weight, the reinforcing filler is 20 to 40 parts by weight, the chain extender is 3 to 8 parts by weight, the cross-linking agent is 3 to 15 parts by weight, the water scavenger is 1 to 8 parts by weight, and the coupling agent is 0.5 to 3 parts by weight, the content of the catalyst is 0.1 to 0.8 weight portion.
The reinforcing filler is one or more of light nano calcium carbonate, heavy nano calcium carbonate, silica micropowder, diatomite and titanium dioxide. Wherein, the chain extender is one or the mixture of methyl vinyl diacetyl ketoxime or dimethyl diacetyl ketoxime. Wherein the cross-linking agent is vinyl tributyrinoxime silane and/or methyl tributyrinoxime silane. Wherein the water removing agent is one or more of zeolite activated powder, vinyl trimethoxy silane, triethyl orthoformate and trimethyl orthoacetate. Wherein the coupling agent is one or more of gamma-aminopropyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, isocyanatopropyltriethoxysilane, Y- (2, 3-glycidoxy) propyltrimethoxysilane and N- (beta-aminoethyl) -Y-aminopropyltrimethoxysilane. Wherein the catalyst is one or more of dimethyl tin dilaurate, dibutyltin dilaurate, dioctyltin dilaurate, dimethyltin dineodecanoate and chelated tin.
The invention provides a self-leveling silicone sealant for concrete joints, which is used for sealing joints of ballastless tracks of railways. The method can realize efficient, simple and convenient caulking sealing of the railway ballastless track, and the excellent mechanical strength and weather resistance of the method can meet the strict requirements of the caulking sealing of the railway ballastless track.
In addition, the self-leveling silicone sealant disclosed by the invention has high displacement performance, flowability, compression resilience, excellent high and low temperature resistance, excellent long-term weather aging resistance and ultraviolet irradiation resistance, is suitable for filling joints of bases, track bed boards, lines and the like of ballastless tracks of high-speed railways, and has the main properties shown in the table 1-1.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In order to achieve the above object, a first aspect of the present invention provides a self-leveling silicone sealant composition for concrete joints, which comprises α, ω -dihydroxy polydimethylsiloxane, dimethicone, a reinforcing filler, a chain extender, a cross-linking agent, a water scavenger, a coupling agent and a catalyst, wherein, relative to 100 parts by weight of α, ω -dihydroxy polydimethylsiloxane, the dimethicone is 10 to 30 parts by weight, the reinforcing filler is 20 to 40 parts by weight, the chain extender is 3 to 8 parts by weight, the cross-linking agent is 3 to 15 parts by weight, the water scavenger is 1 to 8 parts by weight, and the coupling agent is 0.5 to 3 parts by weight, the content of the catalyst is 0.1 to 0.8 weight portion.
The reinforcing filler is one or more of light nano calcium carbonate, heavy nano calcium carbonate, silica micropowder, diatomite and titanium dioxide. Wherein, the chain extender is one or the mixture of methyl vinyl diacetyl ketoxime or dimethyl diacetyl ketoxime. Wherein the cross-linking agent is vinyl tributyrinoxime silane and/or methyl tributyrinoxime silane. Wherein the water removing agent is one or more of zeolite activated powder, vinyl trimethoxy silane, triethyl orthoformate and trimethyl orthoacetate. Wherein the coupling agent is one or more of gamma-aminopropyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, isocyanatopropyltriethoxysilane, Y- (2, 3-glycidoxy) propyltrimethoxysilane and N- (beta-aminoethyl) -Y-aminopropyltrimethoxysilane. Wherein the catalyst is one or more of dimethyl tin dilaurate, dibutyltin dilaurate, dioctyltin dilaurate, dimethyltin dineodecanoate and chelated tin.
The invention provides a self-leveling silicone sealant for concrete joints, which is used for sealing joints of ballastless tracks of railways. The method can realize efficient, simple and convenient caulking sealing of the railway ballastless track, and the excellent mechanical strength and weather resistance of the method can meet the strict requirements of the caulking sealing of the railway ballastless track.
The product provided by the invention is a high-performance durable environment-friendly single-component silicone sealing material, has high displacement performance, flowability, compression resilience, excellent high and low temperature resistance, excellent long-term weather aging resistance and ultraviolet irradiation resistance, and is suitable for filling joints of bases, track bed boards, lines and the like of ballastless tracks of high-speed railways.
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
According to the invention, the mixing is preferably carried out by:
(1) preparation process of self-leveling silicone caulking glue base material
Adding alpha, omega-dihydroxy polydimethylsiloxane (107 silicon rubber), reinforcing filler and dimethyl silicone oil into a planetary stirring dispersion machine, stirring for 30 minutes at normal temperature, stopping the machine for shoveling, heating and stirring to 100 ℃, starting vacuumizing and stirring, maintaining the temperature at 150 ℃ and the vacuum degree of-0.08 MPa, vacuumizing and stirring for 5 hours, and stopping the machine for cooling to finish the preparation of the base material.
(2) Self-leveling silicone caulk glue making process
Adding the prepared base material and the chain extender into a planetary stirring dispersion machine, vacuumizing and stirring for 50 minutes, wherein the vacuum degree is-0.06 MPa; then stopping the machine and shoveling the machine, adding the dimethyl silicon oil, the cross-linking agent, the water removing agent, the coupling agent and the catalyst, vacuumizing and stirring for 40 minutes, wherein the vacuum degree is-0.06 MPa; and finishing the glue preparation after stopping filling.
The concrete components and parts by weight are as follows:
example 2
Example 2 is different from example 1 in the weight ratio of components and the components, and the preparation method is the same as example 1.
Example 3
Example 3 is different from example 1 in the weight ratio of components and the components, and the preparation method is the same as example 1.
The product prepared by the method obtains good material performance through testing, has high displacement performance, flowability, compression resilience, excellent high and low temperature resistance, excellent long-term weather aging resistance and ultraviolet irradiation resistance, is suitable for filling joints of bases, track bed boards, lines and the like of ballastless tracks of high-speed railways, and has the following main properties:
although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The self-leveling silicone sealant composition for the concrete joint is characterized by comprising alpha, omega-dihydroxy polydimethylsiloxane, dimethyl silicone oil, reinforcing filler, chain extender, cross-linking agent, water remover, coupling agent and catalyst, wherein the content of the dimethyl silicone oil is 10-30 parts by weight, the content of the reinforcing filler is 20-40 parts by weight, the content of the chain extender is 3-8 parts by weight, the content of the cross-linking agent is 3-15 parts by weight, the content of the water remover is 1-8 parts by weight, the content of the coupling agent is 0.5-3 parts by weight, and the content of the catalyst is 0.1-0.8 part by weight, relative to 100 parts by weight of the alpha, omega-dihydroxy polydimethylsiloxane.
2. The self-leveling silicone sealant composition for concrete joints according to claim 1, wherein the reinforcing filler is one or more of light nano calcium carbonate, heavy nano calcium carbonate, silica micropowder, diatomaceous earth and titanium dioxide.
3. The self-leveling silicone sealant composition for concrete joints according to claim 1, wherein the chain extender is one of methyl vinyl diacetyl ketoxime or dimethyl diacetyl ketoxime or a mixture thereof.
4. The self-leveling silicone sealant composition for concrete joints according to claim 1, wherein the crosslinking agent is one of vinyl tributyrinoxime silane or methyl tributyrinoxime silane or a mixture thereof.
5. The self-leveling silicone sealant composition for concrete joints according to claim 1, wherein the water scavenger is one or more of zeolite activator, vinyltrimethoxysilane, triethyl orthoformate and trimethyl orthoacetate.
6. The self-leveling silicone sealant composition for concrete joints according to claim 1, wherein the coupling agent is one or more of gamma-aminopropyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, isocyanatopropyltriethoxysilane, Y- (2, 3-glycidoxy) propyltrimethoxysilane, and N- (beta-aminoethyl) -Y-aminopropyltrimethoxysilane.
7. The self-leveling silicone sealant composition for concrete joints according to claim 1, wherein the catalyst is one or more of dimethyl tin dilaurate, dibutyl tin dilaurate, dioctyl tin dilaurate, dimethyl tin dineodecanoate, and chelated tin.
8. The self-leveling silicone sealant composition for concrete joints according to claim 1, which is used for sealing joints of ballastless tracks of railways.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011135894.7A CN112375538A (en) | 2020-10-22 | 2020-10-22 | Self-leveling silicone sealant and application thereof in caulking of railway ballastless track |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011135894.7A CN112375538A (en) | 2020-10-22 | 2020-10-22 | Self-leveling silicone sealant and application thereof in caulking of railway ballastless track |
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| Publication Number | Publication Date |
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| CN112375538A true CN112375538A (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011135894.7A Pending CN112375538A (en) | 2020-10-22 | 2020-10-22 | Self-leveling silicone sealant and application thereof in caulking of railway ballastless track |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113088246A (en) * | 2021-04-28 | 2021-07-09 | 江苏润泰胶业有限公司 | High-viscosity silicone sealant and preparation method thereof |
| CN114774072A (en) * | 2022-05-16 | 2022-07-22 | 江西省奋发粘胶化工有限公司 | Preparation method of oil-leakage-free silicone sealant |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004492A (en) * | 2014-06-09 | 2014-08-27 | 中国铁道科学研究院铁道建筑研究所 | Silicone caulking material for concrete expansion joints of ballastless tracks and preparation method thereof |
| CN108084955A (en) * | 2017-12-20 | 2018-05-29 | 浙江中天氟硅材料有限公司 | Concrete joint one-component Self-leveling silicone seal glue composition and fluid sealant and preparation method thereof |
| WO2020131706A1 (en) * | 2018-12-21 | 2020-06-25 | Dow Silicones Corporation | Silicone-polycarbonate copolymer, sealants comprising same, and related methods |
-
2020
- 2020-10-22 CN CN202011135894.7A patent/CN112375538A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004492A (en) * | 2014-06-09 | 2014-08-27 | 中国铁道科学研究院铁道建筑研究所 | Silicone caulking material for concrete expansion joints of ballastless tracks and preparation method thereof |
| CN108084955A (en) * | 2017-12-20 | 2018-05-29 | 浙江中天氟硅材料有限公司 | Concrete joint one-component Self-leveling silicone seal glue composition and fluid sealant and preparation method thereof |
| WO2020131706A1 (en) * | 2018-12-21 | 2020-06-25 | Dow Silicones Corporation | Silicone-polycarbonate copolymer, sealants comprising same, and related methods |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113088246A (en) * | 2021-04-28 | 2021-07-09 | 江苏润泰胶业有限公司 | High-viscosity silicone sealant and preparation method thereof |
| CN114774072A (en) * | 2022-05-16 | 2022-07-22 | 江西省奋发粘胶化工有限公司 | Preparation method of oil-leakage-free silicone sealant |
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Application publication date: 20210219 |