CN113755095A - Nanometer anti-freezing anti-cracking hydrophobic blue crystal powder and preparation method thereof - Google Patents
Nanometer anti-freezing anti-cracking hydrophobic blue crystal powder 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
- 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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- 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
- 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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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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
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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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
- C08K3/18—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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2262—Oxides; Hydroxides of metals of manganese
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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
- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2272—Ferric oxide (Fe2O3)
Abstract
The invention provides nano antifreezing anti-cracking hydrophobic blue crystal powder, which is prepared from the following raw materials: the coating comprises the following components of cyanite powder, scale-shaped natural mica powder, organosilane emulsion, nano hydrophobic fumed silica, sodium methyl silicate, magnesium aluminum silicate, a surface modifier, a dispersing agent and calcium lignosulfonate. The blue crystal powder forms a fine concave-convex structure on the surface of concrete to form a lotus leaf hydrophobic effect, and improves the water resistance, the water impermeability, the crack resistance and the weather resistance of the concrete, thereby comprehensively improving the durability of the concrete structure and prolonging the service life.
Description
Technical Field
The invention belongs to the field of hydrophobic blue crystal powder preparation, and particularly relates to nano anti-freezing anti-cracking hydrophobic blue crystal powder and a preparation method thereof.
Background
Concrete waterproof materials are mainly classified into flexible waterproof and rigid waterproof. Flexible waterproofing refers to the wrapping of a structure with waterproofing rolls or waterproofing paint. The rigid waterproof is to rely on the compactness of the structural member or adopt rigid materials as waterproof layers to achieve the waterproof purpose of buildings, namely to improve the impermeability of concrete.
At present, flexible waterproof is mostly adopted in China, the service life of the flexible waterproof structure is within 15 years, the flexible waterproof structure does not meet the regulation of general waterproof standards of building and municipal engineering, and the self compactness of the structural part cannot meet the requirement of the impermeability grade of most buildings.
Therefore, the waterproof agent for improving the waterproof and anti-permeability grade of the concrete has great market demand, most rigid materials improve the anti-permeability performance of the concrete in terms of self-healing and compactness, and the prior art can influence or reduce other performance indexes of the concrete while improving a certain performance index of the concrete, indirectly influence the durability of the concrete, and rarely gives consideration to the multifunctional rigid waterproof material for comprehensively improving the durability of the concrete.
Based on the nano antifreezing anti-cracking hydrophobic blue crystal powder and the preparation method thereof, the waterproof impermeability, the crack resistance and the weather resistance of the concrete are improved, so that the durability of the concrete structure is comprehensively improved, and the service life is prolonged.
Disclosure of Invention
In order to solve the technical problems, the invention provides nano anti-freezing anti-cracking hydrophobic blue crystal powder which is prepared from the following raw materials in parts by weight: 100-120 parts of cyanite powder, 120 parts of scale-shaped natural mica powder, 40-60 parts of organosilane emulsion, 30-50 parts of nano hydrophobic fumed silica, 3-5 parts of sodium methyl silicate, 1-3 parts of magnesium aluminum silicate, 0.1-0.3 part of surface modifier, 0.1-0.3 part of dispersant and 0.2-0.3 part of calcium lignosulfonate.
Preferably, the cyanite powder is one of fibrous cyanite powder and platy cyanite powder.
Preferably, the mica powder comprises the following chemical components: SiO 22：36-45％,Al2O3：10-17％，MgO：19-27％， K2O：7-12％，Fe2O3：3-7％，MnO2：1-3％，TiO2：0.3-0.5％，H2O：4-6％。
Preferably, the organosilane emulsion is a hydroxyl group and ether group modified silicone emulsion.
Preferably, the surface modifier is cetyltrimethylammonium bromide.
Preferably, the dispersant is sodium tripolyphosphate.
Preferably, the preparation method comprises the following steps:
step 1: mineral separation and crushing: mixing the sapphire powder and the scaly natural mica powder in parts by weight, putting the mixture into a grinder to grind the mixture into powder of 300-400 meshes, and standing the powder for later use;
step 2: mixing materials: sequentially adding the dispersant, sodium methyl silicate and nano hydrophobic fumed silica in parts by weight into the organosilane emulsion, and stirring and mixing at a high speed to fully infiltrate and disperse the organosilane emulsion and the nano hydrophobic fumed silica to form a mixture;
and step 3: and (3) physicochemical reaction: adding the powder obtained in the step (1) into a high-speed stirring reaction kettle, sequentially adding the magnesium aluminum silicate and the surface modifier in parts by weight, heating to 50-70 ℃ and maintaining for 0.5-2h, then adding the mixture obtained in the step (2), heating to 70-90 ℃, fully mixing, reacting in the high-speed stirring reaction kettle until the liquid is completely evaporated, and fully wrapping the powder with the mixture to obtain a product;
and 4, step 4: drying and grinding: drying the obtained product and grinding to 300-400 meshes;
and 5: vapor-phase active deposition: and introducing compressed gas into the obtained product, depositing, cooling, adding the lignin calcium sulfonate, and fully mixing for 15-30min to improve powder flowability.
Preferably, the speed of the high-speed stirring and mixing in the step 2 is 1000-.
Preferably, the stirring speed of the high-speed stirring reaction kettle in the step 3 is 400-800 rpm.
Compared with the prior art, the invention has the beneficial effects that:
1. the prepared blue crystal powder is a hydrophobic material, the microcosmic lower-layer laminated sheet and the flaky palace' association network of the magnesium aluminum silicate play roles in blocking and nano-scale fiber traction, the tension of the inner surface of concrete is increased, the inner space of the blue crystal powder is V-shaped, a hydration heat diffusion channel is relieved, and the problems of temperature fission, drying shrinkage fission, freeze thawing and reinforcing steel bar corrosion cracking caused by temperature change, water loss and water infiltration are reduced.
2. The blue crystal powder forms a fine concave-convex structure on the surface of concrete, forms a lotus leaf hydrophobic effect, and improves the water resistance, the water impermeability, the crack resistance and the weather resistance of the concrete, thereby comprehensively improving the durability of the concrete structure and prolonging the service life.
Detailed Description
The invention is further described:
example 1:
100 parts of cyanite powder, 110 parts of scale-like natural mica powder, 50 parts of organosilane emulsion, 40 parts of nano hydrophobic fumed silica, 3 parts of sodium methylsilicate, 3 parts of magnesium aluminum silicate, 0.3 part of surface modifier, 0.2 part of dispersant and 0.2 part of calcium lignosulfonate.
Specifically, the preparation method of the nanometer anti-freezing anti-cracking hydrophobic blue crystal powder comprises the following steps:
step 1: mineral separation and crushing: mixing 100 parts of cyanite powder and 110 parts of scaly natural mica powder, and grinding into 375-mesh powder;
step 2: mixing materials: sequentially adding 0.2 part of dispersing agent, 3 parts of sodium methyl silicate and 40 parts of nano hydrophobic fumed silica into 50 parts of organosilane emulsion, and stirring and mixing at a high speed to fully infiltrate and disperse the organosilane emulsion and the nano hydrophobic fumed silica to form a mixture;
and step 3: and (3) physicochemical reaction: adding the powder obtained in the step (1) into a high-speed stirring reaction kettle, sequentially adding 3 parts of magnesium aluminum silicate and 0.3 part of surface modifier, heating to 50-60 ℃ for maintaining for 0.5h, adding the mixture obtained in the step (2), heating to 70-80 ℃, fully mixing, reacting in the high-speed stirring reaction kettle until all liquid is evaporated, and fully wrapping the powder with the mixture to obtain a product;
and 4, step 4: drying and grinding: drying the obtained product and grinding the dried product to 375 meshes;
and 5: vapor-phase active deposition: and introducing compressed gas into the obtained product, depositing, cooling, adding the lignin calcium sulfonate, fully mixing for 15min, and improving the powder flowability.
Example 2:
120 parts of cyanite powder, 100 parts of scale-like natural mica powder, 60 parts of organosilane emulsion, 40 parts of nano hydrophobic fumed silica, 3 parts of sodium methylsilicate, 3 parts of magnesium aluminum silicate, 0.3 part of surface modifier, 0.2 part of dispersant and 0.2 part of calcium lignosulfonate.
Specifically, the preparation method of the nanometer anti-freezing anti-cracking hydrophobic blue crystal powder comprises the following steps:
step 1: mineral separation and crushing: mixing 120 parts of cyanite powder and 100 parts of scaly natural mica powder, and grinding into 400-mesh powder;
step 2: mixing materials: sequentially adding 0.2 part of dispersing agent, 3 parts of sodium methyl silicate and 40 parts of nano hydrophobic fumed silica into 60 parts of organosilane emulsion, and stirring and mixing at a high speed to fully infiltrate and disperse the organosilane emulsion and the nano hydrophobic fumed silica to form a mixture;
and step 3: and (3) physicochemical reaction: adding the powder obtained in the step (1) into a high-speed stirring reaction kettle, sequentially adding 3 parts of aluminum-magnesium silicate and 0.3 part of surface modifier, heating to 50-60 ℃ for maintaining for 0.5h, adding the mixture obtained in the step (2), heating to 80-90 ℃, fully mixing, reacting in the high-speed stirring reaction kettle until all liquid is evaporated, and fully wrapping the powder with the mixture to obtain a product;
and 4, step 4: drying and grinding: drying the obtained product and grinding to 400 meshes;
and 5: and introducing compressed gas into the obtained product, depositing, cooling, adding calcium lignosulfonate, and fully mixing for 15min to improve powder flowability.
Example 3:
120 parts of cyanite powder, 110 parts of scale-like natural mica powder, 50 parts of organosilane emulsion, 50 parts of nano hydrophobic fumed silica, 2 parts of sodium methylsilicate, 2 parts of magnesium aluminum silicate, 0.3 part of surface modifier, 0.3 part of dispersant and 0.2 part of calcium lignosulfonate.
Specifically, the preparation method of the nanometer anti-freezing anti-cracking hydrophobic blue crystal powder comprises the following steps:
step 1: mineral separation and crushing: mixing 120 parts of cyanite powder and 110 parts of scaly natural mica powder, and grinding into 400-mesh powder;
step 2: mixing materials: sequentially adding 0.3 part of dispersing agent, 2 parts of sodium methyl silicate and 50 parts of nano hydrophobic fumed silica into 50 parts of organosilane emulsion, and stirring and mixing at a high speed to fully infiltrate and disperse the organosilane emulsion and the nano hydrophobic fumed silica to form a mixture;
and step 3: and (3) physicochemical reaction: adding the powder obtained in the step (1) into a high-speed stirring reaction kettle, sequentially adding 2 parts of aluminum-magnesium silicate and 0.3 part of surface modifier, heating to 50-60 ℃ for 1 hour, adding the mixture obtained in the step (2), heating to 80-90 ℃, fully mixing, reacting in the high-speed stirring reaction kettle until the liquid is completely evaporated, and fully wrapping the powder with the mixture to obtain a product;
and 4, step 4: drying and grinding: drying the obtained product and grinding the dried product to 400 meshes;
and 5: vapor-phase active deposition: and introducing compressed gas into the obtained product, depositing, cooling, adding calcium lignosulfonate, and fully mixing for 20min to improve powder flowability.
Example 4:
100 parts of cyanite powder, 100 parts of scale-like natural mica powder, 60 parts of organosilane emulsion, 40 parts of nano hydrophobic fumed silica, 3 parts of sodium methylsilicate, 3 parts of magnesium aluminum silicate, 0.3 part of surface modifier, 0.3 part of dispersant and 0.2 part of calcium lignosulfonate.
Specifically, the preparation method of the nanometer anti-freezing anti-cracking hydrophobic blue crystal powder comprises the following steps:
step 1: mineral separation and crushing: mixing 100 parts of cyanite powder and 100 parts of scaly natural mica powder, and grinding into 400-mesh powder;
step 2: mixing materials: sequentially adding 0.3 part of dispersing agent, 3 parts of sodium methyl silicate and 40 parts of nano hydrophobic fumed silica into 60 parts of organosilane emulsion, and stirring and mixing at a high speed to fully infiltrate and disperse the organosilane emulsion and the nano hydrophobic fumed silica to form a mixture;
and step 3: and (3) physicochemical reaction: adding the powder obtained in the step (1) into a high-speed stirring reaction kettle, sequentially adding 3 parts of aluminum-magnesium silicate and 0.3 part of surface modifier, heating to 50-60 ℃ for maintaining for 0.5h, adding the mixture obtained in the step (2), heating to 80-90 ℃, fully mixing, reacting in the high-speed stirring reaction kettle until all liquid is evaporated, and fully wrapping the powder with the mixture to obtain a product;
and 4, step 4: drying and grinding: drying the obtained product and grinding the dried product to 400 meshes;
and 5: vapor-phase active deposition: and introducing compressed gas into the obtained product, depositing, cooling, adding calcium lignosulfonate, and fully mixing for 20min to improve powder flowability.
Example 5:
100 parts of cyanite powder, 120 parts of scale-shaped natural mica powder, 50 parts of organosilane emulsion, 3 parts of nano hydrophobic fumed silica, 3 parts of sodium methyl silicate, 3 parts of magnesium aluminum silicate, 0.3 part of surface modifier, 0.3 part of dispersant and 0.3 part of calcium lignosulfonate.
Specifically, the preparation method of the nanometer anti-freezing anti-cracking hydrophobic blue crystal powder comprises the following steps:
step 1: mineral separation and crushing: mixing 100 parts of cyanite powder and 120 parts of scaly natural mica powder, and grinding into 400-mesh powder;
step 2: mixing materials: sequentially adding 0.3 part of dispersing agent, 3 parts of sodium methyl silicate and 50 parts of nano hydrophobic fumed silica into 50 parts of organosilane emulsion, and stirring and mixing at a high speed to fully infiltrate and disperse the organosilane emulsion and the nano hydrophobic fumed silica to form a mixture;
and step 3: and (3) physicochemical reaction: adding the powder obtained in the step (1) into a high-speed stirring reaction kettle, sequentially adding 3 parts of aluminum-magnesium silicate and 0.3 part of surface modifier, heating to 50-60 ℃ for 1.5h, adding the mixture obtained in the step (2), heating to 80-90 ℃, fully mixing, reacting in the high-speed stirring reaction kettle until all liquid is evaporated, and fully wrapping the powder with the mixture to obtain a product;
and 4, step 4: drying and grinding: drying the obtained materials and grinding the dried materials to 400 meshes;
and 5: vapor-phase active deposition: and introducing compressed gas into the obtained product, depositing, cooling, adding calcium lignosulfonate, and fully mixing for 20min to improve powder flowability.
Application example:
the anti-freezing anti-cracking hydrophobic blue crystal powder with 2 percent of nano is added, and the following performance tests are carried out according to the national standard GB/T50082-2009 test of the long-term performance and durability of common concrete according to the same concrete material mixing ratio:
water barrier properties (deep water height method): 3d, 28 d; impervious height ratio: 56.3 percent and 31.2 percent.
Freeze-thaw resistance (tested by a rapid freeze-thaw method, the mass loss of a concrete test piece is not more than 5 percent, and the dynamic elastic modulus is not less than 60 percent): 528 times.
Shrinkage ratio (3 d): 104 percent.
Compressive strength ratio: 3d and 28d are 110% and 108%, respectively.
Early crack resistance ratio: 79.8 percent, after the surface of the test piece is smeared for 30min, the test piece is blown by wind for 60min, and the running water is sprayed for maintenance.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The nanometer anti-freezing anti-cracking hydrophobic blue crystal powder is characterized by being prepared from the following raw materials in parts by weight: 100-120 parts of cyanite powder, 120 parts of scaly natural mica powder, 40-60 parts of organosilane emulsion, 30-50 parts of nano hydrophobic fumed silica, 3-5 parts of sodium methylsilicate, 1-3 parts of magnesium aluminum silicate, 0.1-0.3 part of surface modifier, 0.1-0.3 part of dispersant and 0.2-0.3 part of calcium lignosulfonate.
2. The nano antifreezing anti-cracking hydrophobic cyanite powder as claimed in claim 1, wherein the cyanite powder is one of fibrous cyanite powder and platy cyanite powder.
3. The nano anti-freezing anti-cracking hydrophobic blue crystal powder as claimed in claim 1, wherein the chemical components of the mica powder are as follows: SiO 22：36-45％,Al2O3：10-17％，MgO：19-27％，K2O：7-12％，Fe2O3：3-7％，MnO2：1-3％，TiO2：0.3-0.5％，H2O：4-6％。
4. The nano antifreeze anti-crack hydrophobic blue crystal powder as claimed in claim 1, wherein the organosilane emulsion is a hydroxyl group and ether group modified organosilicon emulsion.
5. The nano antifreeze anti-crack hydrophobic blue crystal powder as claimed in claim 1, wherein the surface modifier is cetyl trimethyl ammonium bromide.
6. The nano antifreeze anti-crack hydrophobic blue crystal powder as claimed in claim 1, wherein the dispersant is sodium tripolyphosphate.
7. The preparation method of the nano anti-freezing anti-cracking hydrophobic blue crystal powder as claimed in claim 1, characterized by comprising the following steps:
step 1: mineral separation and crushing: mixing the sapphire powder and the scaly natural mica powder in parts by weight, putting the mixture into a grinder to grind the mixture into powder of 300-400 meshes, and standing the powder for later use;
step 2: mixing materials: sequentially adding the dispersant, sodium methyl silicate and nano hydrophobic fumed silica in parts by weight into the organosilane emulsion, and stirring and mixing at a high speed to fully infiltrate and disperse the organosilane emulsion and the nano hydrophobic fumed silica to form a mixture;
and step 3: and (3) physicochemical reaction: adding the powder obtained in the step (1) into a high-speed stirring reaction kettle, sequentially adding the magnesium aluminum silicate and the surface modifier in parts by weight, heating to 50-70 ℃ for maintaining for 0.5-2h, adding the mixture obtained in the step (2), heating to 70-90 ℃, fully mixing, reacting in the high-speed stirring reaction kettle until the liquid is completely evaporated, and fully wrapping the powder with the mixture to obtain a product;
and 4, step 4: drying and grinding: drying the obtained product and grinding to 300-400 meshes;
and 5: vapor-phase active deposition: introducing compressed gas into the obtained product, depositing, cooling, adding calcium lignosulfonate, mixing for 15-30min, and improving powder fluidity.
8. The method as claimed in claim 7, wherein the mixing speed in step 2 is 1500 rpm/min.
9. The method as claimed in claim 7, wherein the stirring speed of the high-speed stirring reaction kettle in step 3 is 400-800 rpm.
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Effective date of registration: 20220921 Address after: A107-1, Binhai Times Building, No. 590 Huzhou Road, Binhai-Zhongguancun Science and Technology Park, Economic and Technological Development Zone, Binhai New Area, Tianjin 300457 Patentee after: Zhongbin Tianke (Tianjin) High-tech Co.,Ltd. Patentee after: Zhongbin Tianke (Tianjin) new material Co.,Ltd. Address before: 464000 100m east of Gongshi Road, high tech Industrial Park, Xinyang City, Henan Province Patentee before: Zhongbin Tianke (Xinyang) new material Co.,Ltd. Patentee before: Zhongbin Tianke (Tianjin) new material Co.,Ltd. |