CN113372812A - Organosilicon elastic coating for building waterproofing and preparation method and application thereof - Google Patents
Organosilicon elastic coating for building waterproofing and preparation method and application 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
- 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
- C09D183/00—Coating compositions 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; Coating compositions based on derivatives of such polymers
- C09D183/04—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
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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
- C09D7/63—Additives non-macromolecular organic
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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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
- C08K2003/3036—Sulfides of zinc
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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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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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
- C08L2201/02—Flame or fire retardant/resistant
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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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Abstract
The invention relates to the field of high polymer sealing materials, and discloses an organosilicon elastic coating for building waterproofing, and a preparation method and application thereof. The material is prepared from alpha, omega-hydroxyl-terminated polydimethylsiloxane, dimethyl silicone oil, modified superfine zinc sulfide, modified superfine barium sulfate, modified aluminum hydroxide, a silane coupling agent, a crosslinking agent and a catalyst. The preparation method comprises the steps of kneading, stirring and mixing the raw materials in steps under the conditions that the vacuum degree is-0.09 to-0.1 Mpa and the stirring speed is 20 to 30Hz for 65 to 75min, discharging and filling to obtain the product. The waterproof adhesive has good performance when applied to building waterproofing, has good adhesion to concrete, and has the advantages of rotational viscosity of 26000-35000 mpa.s, hardness of 42-50 shore A, tensile strength of 4.0-4.7 MPa, elongation at break of 260-320%, peeling adhesion of 6.0-8.0N/mm and the like.
Description
Technical Field
The invention relates to the field of high-molecular sealing materials, in particular to an organosilicon elastic coating for building waterproofing, a preparation method and application thereof.
Background
According to investigation, the top floors of the large buildings with the building age of more than 5 years have water leakage problems of different degrees. At present, the materials for floor waterproofing in China mainly comprise coiled materials and coatings.
The coiled material mainly takes the modified asphalt as a main material, and because the coiled material is lapped through melting when in use and the heat resistance and the aging resistance of the asphalt material are relatively poor, the coiled material cannot play a good waterproof function when being used for a long time.
The coating is mainly polyurethane, and although the weather resistance and aging resistance of the polyurethane material are better than those of the modified asphalt material, the coating is far from the organosilicon material, and the problem of water leakage of the building roof can not be effectively and thoroughly solved.
The prior art patent publication No. CN106947427A discloses a silicone sealant for construction and a preparation method thereof, wherein a hyperbranched polyurea anti-sagging agent is adopted, and the hyperbranched molecular structure and the contained groups of the hyperbranched polyurea anti-sagging agent are utilized to ensure that the hyperbranched polyurea anti-sagging agent has the characteristics of low viscosity, good dispersibility, good thixotropy and the like, and the hyperbranched polyurea anti-sagging agent is added into the silicone sealant as the anti-sagging agent to endow the silicone sealant with excellent thixotropic effect.
Prior art patent publication No. CN110938405A discloses a heat-resistant, acid-and alkali-resistant organic silica gel prepared by adding TiO to alpha, omega-dihydroxy polydimethylsiloxane2P25、TiO2PF2And heat-resistant agent composed of polyisobutylene and superfine precipitated barium sulfate as acid-base resistant filler, which can greatly improve the thermal stability and acid-base resistance of organic silica gel.
The prior art patent publication No. CN111849414A discloses a modified nano-silicon-fluorine rubber for floor waterproofing and a preparation method thereof, wherein modified nano-spherical barium sulfate is used as a filler, so that the rubber body is reinforced, and the fluidity of the rubber body is not influenced. However, this product has a problem that hardness, tensile strength and peel adhesion are weak.
Disclosure of Invention
The invention aims to solve the problems of weak hardness, tensile strength, peeling adhesion and the like in the application effect of products in the prior art, and provides the organosilicon elastic coating for building waterproofing.
The invention also aims to provide a preparation method and application of the organic silicon elastic coating for building waterproofing.
Another purpose of the invention is to provide the application of the organosilicon elastic coating for building waterproofing
The purpose of the invention is realized by the following technical scheme:
an organosilicon elastic coating for building waterproofing is composed of the following raw materials in parts by weight:
the surface drying time of the organosilicon elastic coating for building waterproofing is 20-30 min, the rotational viscosity is 26000-35000 mpa.s, the hardness is 42-50 shore A, the tensile strength is 4.0-4.7 MPa, and the elongation at break is 260-320%; the water impermeability is realized under the water pressure of 0.3MPa for 24h, and the water impermeability is realized; the peel adhesion is 6.0-8.0N/mm, and the impact resistance is 1.5-1.9 kg.m;
the alpha, omega-hydroxyl-terminated polydimethylsiloxane consists of 750-1500 mpa.s and 20000-80000 mpa.s of viscosity at the temperature of 25 ℃;
the modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide are prepared through spraying zinc sulfide powder, barium sulfate powder and aluminum hydroxide powder with hexamethyldisilazane.
The invention is room temperature vulcanized silicone rubber, and vulcanization crosslinking requires trace moisture in the air for reaction. The invention innovatively adopts the surface modification of the powder to remove the water in the powder so as to achieve the aim of eliminating the adverse effects.
Preferably, the ratio of the a, omega-hydroxyl-terminated polydimethylsiloxane with the viscosity of 750-1500 mpa.s at the temperature of 25 ℃ to the a, omega-hydroxyl-terminated polydimethylsiloxane with the viscosity of 20000-80000 mpa.s is as follows: 30-70: 70-30.
Preferably, the viscosity of the dimethyl silicone oil at the temperature of 25 ℃ is 50-350 mpa.s.
Preferably, the granularity of the zinc sulfide powder is 5000-6000 meshes; the particle size of the barium sulfate powder is 5000-6000 meshes; the granularity of the aluminum hydroxide is 2000-3000 meshes.
Preferably, the spraying treatment process of the hexamethyldisilazane comprises the steps of heating powder to be treated to 60-80 ℃, stirring for 30-60 min under the condition that the vacuum degree is-0.08-0.06 MPa, then uniformly spraying the hexamethyldisilazane on the surface of the powder through a metering device at the speed of 1-1.5L/h, and continuously stirring for 30-60 min, wherein the vacuum degree is-0.08-0.06 MPa or cooling under the protection of nitrogen.
Preferably, the silane coupling agent is one of gamma-aminopropyltriethoxysilane, gamma-aminoethylaminopropyltrimethoxysilane or a combination thereof.
Preferably, the cross-linking agent is two combinations of methyl tributyrinoxime silane, vinyl tributyrinoxime silane and phenyl tributyrinoxime silane.
Preferably, the catalyst is one of di-n-butyl tin dilaurate, di-n-butyl tin diacetate or a combination thereof.
A preparation method of the organosilicon elastic coating for building water resistance comprises the steps of kneading, stirring and mixing raw materials in steps at a vacuum degree of-0.09 MPa to-0.1 MPa and a stirring speed of 20Hz to 30Hz for 65 min to 75min, discharging and filling to obtain the product.
The organic silicon elastic coating for building waterproofing is applied to building waterproofing.
Compared with the prior art, the invention has the following technical effects:
the invention provides the organosilicon elastic coating for building waterproofing by combining the excellent comprehensive performance of organosilicon materials, not only provides an organosilicon elastic coating product with higher hardness, tensile strength and stripping adhesion for the floor waterproofing field, but also is beneficial to effectively and thoroughly solving the problem of building roof water leakage.
According to the invention, through optimizing a formula system, the modified superfine zinc sulfide, the modified superfine barium sulfate and the modified aluminum hydroxide are used as fillers, so that the reinforcing and flame-retardant effects on the colloid are achieved, and the fluidity of the colloid is not influenced.
The organosilicon elastic coating for building water resistance has the characteristics of good fluidity, high tensile strength and good extensibility, has good adhesion to concrete, and has the surface drying time of 20-30 min, the rotational viscosity of 26000-35000 mpa.s, the hardness of 42-50 shoreA, the tensile strength of 4.0-4.7 MPa, the elongation at break of 260-320%, the impermeability (impermeability for 24h under the water pressure of 0.3 MPa), the peel adhesion of 6.0-8.0N/mm, the impact resistance of 1.5-1.9 kg.m, the heating expansion rate of less than-0.04%, the water absorption rate of less than or equal to 1.5%, and the colloid can also keep good performance after stretching aging, thermal aging, acid-base salt aging and artificial climate aging.
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, various embodiments of the invention are described below
Example 1
An organosilicon elastic coating for building waterproofing comprises the following raw materials in parts by weight:
wherein:
the cross-linking agent comprises 7 parts by weight of methyl tributyrinoxime silane and 1.5 parts by weight of vinyl tributyrinoxime silane.
The modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide are prepared through spraying zinc sulfide powder, barium sulfate powder and aluminum hydroxide powder with hexamethyldisilazane. The spraying treatment process of hexamethyldisilazane comprises heating powder to be treated to 60 ℃, stirring for 30min under the condition of vacuum degree of-0.08 MPa, then uniformly spraying hexamethyldisilazane on the surface of the powder by a metering device at the speed of 1L/h, and continuously stirring for 60min, and cooling under the vacuum degree of-0.06 MPa.
The preparation method of the organosilicon elastic coating for building waterproofing comprises the following steps:
according to the raw material proportion, firstly, adding alpha, omega-hydroxyl-terminated polydimethylsiloxane, modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide into a planetary stirrer, and stirring for 20min under the vacuum degree of-0.09 Mpa and the stirring frequency of 30 Hz; adding dimethyl silicone oil into planetary stirrer, and stirring at vacuum degree of-0.09 Mpa and stirring frequency of 30Hz for 20 min; and finally, adding the cross-linking agent, the silane coupling agent and the catalyst, stirring for 25min under the conditions of vacuum degree of-0.1 Mpa and stirring frequency of 25Hz, discharging and filling to obtain the product.
Example 2
The embodiment of the invention relates to a waterproof organosilicon elastic coating for buildings, which comprises the following raw materials in parts by weight:
wherein:
the cross-linking agent comprises, by weight, 7.5 parts of methyl tributyrinoxime silane and 1.5 parts of vinyl tributyrinoxime silane.
The modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide are prepared through spraying zinc sulfide powder, barium sulfate powder and aluminum hydroxide powder with hexamethyldisilazane. The spraying treatment process of the hexamethyldisilazane comprises the steps of heating powder to be treated to 80 ℃, stirring for 60min under the condition that the vacuum degree is-0.08 MPa, then uniformly spraying the hexamethyldisilazane onto the surface of the powder through a metering device at the speed of 1.5L/h, continuously stirring for 30min, and cooling under the protection of nitrogen.
The preparation method of the organosilicon elastic coating for building waterproofing comprises the following steps:
according to the raw material proportion, firstly, adding alpha, omega-hydroxyl-terminated polydimethylsiloxane, modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide into a planetary stirrer, and stirring for 30min under the vacuum degree of-0.09 Mpa and the stirring frequency of 30 Hz; adding dimethyl silicone oil into planetary stirrer, and stirring at vacuum degree of-0.09 Mpa and stirring frequency of 30Hz for 20 min; and finally, adding the cross-linking agent, the silane coupling agent and the catalyst, stirring for 25min under the conditions of vacuum degree of-0.1 Mpa and stirring frequency of 20Hz, discharging and filling to obtain the product.
Example 3
The embodiment of the invention relates to a waterproof organosilicon elastic coating for buildings, which comprises the following raw materials in parts by weight:
wherein:
the cross-linking agent comprises 9 parts by weight of methyl tributyrinoxime silane and 1.5 parts by weight of phenyl tributyrinoxime silane.
The modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide are prepared through spraying zinc sulfide powder, barium sulfate powder and aluminum hydroxide powder with hexamethyldisilazane. The spraying treatment process of hexamethyldisilazane comprises heating powder to be treated to 70 ℃, stirring for 30min under the condition of vacuum degree of-0.08 MPa, then uniformly spraying hexamethyldisilazane on the surface of the powder by a metering device at the speed of 1.5L/h, and continuously stirring for 60min, and cooling under the vacuum degree of-0.06 MPa.
The preparation method of the organosilicon elastic coating for building waterproofing comprises the following steps:
according to the raw material proportion, firstly, adding alpha, omega-hydroxyl-terminated polydimethylsiloxane, modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide into a planetary stirrer, and stirring for 20min under the vacuum degree of-0.09 Mpa and the stirring frequency of 25 Hz; adding dimethyl silicone oil into the planetary stirrer, and stirring for 30min under vacuum degree of-0.09 Mpa and stirring frequency of 30 Hz; and finally, adding the cross-linking agent, the silane coupling agent and the catalyst, stirring for 20min under the conditions of vacuum degree of-0.1 Mpa and stirring frequency of 30Hz, discharging and filling to obtain the product.
Example 4
The embodiment of the invention relates to a waterproof organosilicon elastic coating for buildings, which comprises the following raw materials in parts by weight:
wherein:
the cross-linking agent comprises 8 parts of methyl tributyrinoxime silane and 1 part of vinyl tributyrinoxime silane in parts by weight.
The modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide are prepared through spraying zinc sulfide powder, barium sulfate powder and aluminum hydroxide powder with hexamethyldisilazane. The spraying treatment process of the hexamethyldisilazane comprises the steps of heating powder to be treated to 80 ℃, stirring for 30min under the condition that the vacuum degree is-0.08 MPa, uniformly spraying the hexamethyldisilazane onto the surface of the powder at the speed of 1L/h through a metering device, continuously stirring for 40min, and cooling under the protection of nitrogen.
The preparation method of the organosilicon elastic coating for building waterproofing comprises the following steps:
according to the raw material proportion, firstly, adding alpha, omega-hydroxyl-terminated polydimethylsiloxane, modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide into a planetary stirrer, and stirring for 25min under the vacuum degree of-0.09 Mpa and the stirring frequency of 30 Hz; adding dimethyl silicone oil into the planetary stirrer, and stirring for 30min under vacuum degree of-0.09 Mpa and stirring frequency of 30 Hz; and finally, adding the cross-linking agent, the silane coupling agent and the catalyst, stirring for 20min under the conditions of vacuum degree of-0.1 Mpa and stirring frequency of 30Hz, discharging and filling to obtain the product.
Comparative examples 1 to 8
Comparative examples 1 to 8 a preparation method of an organic silicon elastic coating for building waterproofing is the same as that of example 1, and the raw material compositions thereof by weight are respectively shown in table 1.
Wherein: the silane coupling agent (gamma-aminoethyl aminopropyl trimethoxy silane), the cross-linking agent, the catalyst (di-n-butyl tin dilaurate) and the cross-linking agent comprise 7.5 parts by weight of methyl tributyl ketoxime silane and 1.5 parts by weight of vinyl tributyrinoxime silane.
The modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide are prepared through spraying zinc sulfide powder, barium sulfate powder and aluminum hydroxide powder with hexamethyldisilazane. The spraying treatment process of hexamethyldisilazane comprises heating powder to be treated to 60 ℃, stirring for 30min under the condition of vacuum degree of-0.08 MPa, then uniformly spraying hexamethyldisilazane on the surface of the powder by a metering device at the speed of 1L/h, and continuously stirring for 60min, and cooling under the vacuum degree of-0.06 MPa.
And (3) performance testing:
the performance of the organosilicon elastic coating for building waterproofing prepared by the embodiments of the invention is tested according to the following method:
method for measuring viscosity: the rotational speed of rotor No. 4 (rotor No. 6) was measured using a rotary viscometer.
Measuring the surface drying time according to GB/T13477.5-2002; testing the Shore hardness of the colloid according to GB/T531.1-2008; elongation at break and tensile strength were tested according to GB/T528; measuring the solid content, the impermeability, the low-temperature flexibility, the heating expansion and contraction rate, the bonding strength, the water absorption rate, the stretching and aging, the heat treatment, the alkali treatment, the acid treatment, the water resistance, the combustion performance, the performance change after artificial aging and the content of harmful substances of the colloid according to GB/T16777-; determining the performance change of the colloid after the salt treatment according to GB/T11547-2008; the peel adhesion of the gel was measured according to GB/T13477.18-2002.
The test results of examples 1 to 4 are shown in Table 2.
Table 2 performance test data
The test results of comparative examples 1 to 8 are shown in Table 3.
Table 3 performance test data
"poor fluidity" means that the viscosity measured was 100000mpa.s or more, and the viscosity was not measured because the leveling was not possible, the workability was poor, and the subsequent data was not meaningful.
The test results in table 2 show that the organosilicon elastic coating for building waterproofing prepared by the embodiment of the invention has the characteristics of good fluidity, high tensile strength, good extensibility and excellent waterproofness, has good adhesion to concrete, can still keep good ductility and mechanical properties under severe aging conditions, does not contain harmful substances, and meets the requirements of environmental protection regulations.
The test results in table 3 show that 1, the product which meets the construction requirements and has balanced comprehensive performance is obtained by reasonably matching and using the alpha, omega-hydroxyl-terminated polydimethylsiloxane with high and low viscosity. When used alone, some properties are more prominent, but some properties are also deteriorated accordingly. 2. The use of the modified powder is beneficial to obtaining products meeting construction requirements.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. The organic silicon elastic coating for building waterproofing is characterized by comprising the following raw materials in parts by weight:
the surface drying time of the organosilicon elastic coating for building waterproofing is 20-30 min, the rotational viscosity is 26000-35000 mpa.s, the hardness is 42-50 shore A, the tensile strength is 4.0-4.7 MPa, and the elongation at break is 260-320%; the water impermeability is realized under the water pressure of 0.3MPa for 24h, and the water impermeability is realized; the peel adhesion is 6.0-8.0N/mm, and the impact resistance is 1.5-1.9 kg.m;
the alpha, omega-hydroxyl-terminated polydimethylsiloxane consists of 750-1500 mpa.s and 20000-80000 mpa.s of viscosity at the temperature of 25 ℃;
the modified superfine zinc sulfide, modified superfine barium sulfate and modified aluminum hydroxide are prepared through spraying zinc sulfide powder, barium sulfate powder and aluminum hydroxide powder with hexamethyldisilazane.
2. The silicone elastic coating material for waterproofing buildings according to claim 1, wherein the ratio of the a, ω -hydroxyl terminated polydimethylsiloxane having a viscosity of 750 to 1500mpa.s at a temperature of 25 ℃ to the a, ω -hydroxyl terminated polydimethylsiloxane of 20000 to 80000mpa.s is: 30-70: 70-30.
3. The silicone elastic coating material for waterproofing buildings according to claim 1, wherein the viscosity of the dimethylsilicone oil at a temperature of 25 ℃ is 50 to 350 mpa.s.
4. The silicone elastic coating for waterproofing of buildings according to claim 1, wherein the particle size of the zinc sulfide powder is 5000 to 6000 mesh; the particle size of the barium sulfate powder is 5000-6000 meshes; the granularity of the aluminum hydroxide is 2000-3000 meshes.
5. The organosilicon elastic coating for building waterproofing according to claim 1, wherein the hexamethyldisilazane is sprayed by heating the powder to be treated to 60-80 ℃, stirring for 30-60 min under the condition of vacuum degree of-0.08-0.06 MPa, then uniformly spraying hexamethyldisilazane on the surface of the powder by a metering device at the speed of 1-1.5L/h, and continuously stirring for 30-60 min, wherein the vacuum degree is-0.08-0.06 MPa or cooling under the protection of nitrogen.
6. The silicone elastic coating for building waterproofing according to claim 1, wherein the silane coupling agent is one of γ -aminopropyltriethoxysilane, γ -aminoethylaminopropyltrimethoxysilane or a combination thereof.
7. The silicone elastic coating for building waterproofing according to claim 1, characterized in that the crosslinking agent is a combination of two of methyl tributyrinoxime silane, vinyl tributyrinoxime silane, and phenyl tributyrinoxime silane.
8. The silicone elastic coating material for waterproofing buildings according to claim 1, wherein the catalyst is one of di-n-butyl tin dilaurate, di-n-butyl tin diacetate, or a combination thereof.
9. The preparation method of the organosilicon elastic coating for building waterproofing according to any one of claims 1 to 8, characterized in that the raw materials are kneaded, stirred and mixed for 65 to 75min in steps under the vacuum degree of-0.09 to-0.1 Mpa and the stirring speed of 20 to 30Hz, and the product is obtained after discharging and filling.
10. The use of the silicone elastic coating for waterproofing buildings according to any one of claims 1 to 8, characterized in that it is used for waterproofing buildings.
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| CN111892905A (en) * | 2020-08-06 | 2020-11-06 | 广州汇纳新材料科技有限公司 | Anti-settling high-hardness single-component room temperature vulcanized silicone rubber for encapsulation and preparation method thereof |
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