CN107384192A - A kind of preparation method of high temperature organosilicon paint - Google Patents
A kind of preparation method of high temperature organosilicon paint Download PDFInfo
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- CN107384192A CN107384192A CN201710772669.6A CN201710772669A CN107384192A CN 107384192 A CN107384192 A CN 107384192A CN 201710772669 A CN201710772669 A CN 201710772669A CN 107384192 A CN107384192 A CN 107384192A
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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
- C09D5/08—Anti-corrosive 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
- 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
-
- 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
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
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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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a kind of preparation method of high temperature organosilicon paint, belong to field of material technology.The specific preparation method of high temperature organosilicon paint prepared by the present invention is：By the methanol solution in mass ratio 3 that organic siliconresin and mass fraction are 10~15%：2 mixing, add the glass dust of organic siliconresin quality 2~5% and the high temperature color stuffing of organic siliconresin quality 10~15%, are stirred, obtain pre- coating；By petroleum coke powder and mix acid liquor in mass ratio 1：1.2~1：18 mix, and obtain mixed liquor, then are 1 in mass ratio：2~1：5 is scattered with ethylene glycol, obtaining carbonaceous collosol and gel by gained mixed liquor；Again by carbonaceous collosol and gel and tetraethyl orthosilicate in mass ratio 2：1 mixing, and adjust pH to neutrality with sodium hydroxide solution, adds the oxide nano rare earth of carbonaceous collosol and gel quality 2~3%, after sonic oscillation additive；By additive and pre- coating in mass ratio 4：3 mix to obtain high temperature organosilicon paint.Organosilicon coating prepared by the present invention can effectively improve the heat-resisting quantity, corrosion resistance and mechanical performance of high temperature organosilicon paint.
Description
Technical field
The invention discloses a kind of preparation method of high temperature organosilicon paint, belong to technical field of coatings.
Background technology
High-temperature resistant coating generally refers to that 200 DEG C of temperatures above can be born for a long time, and can keep certain physical and chemical performance, makes
The special functional coating that protected object can normally play a role in hot environment.High-temperature resistant coating is typically gathered by high temperature resistant
Compound, color stuffing, solvent and auxiliary agent composition, also known as heat-resisting paint.It extensively coated on high-temperature pipe, heat exchanger, high temperature furnace,
The equipment surfaces such as petroleum cracking equipment, motor part and blast pipe, to prevent the thermal oxide of the metals such as steel at high temperature
Corrosion, has broad application prospects in modern industry, military affairs, space industry.
General high-temperature resistant coating is divided into two major classes：One kind is with organosilicon, and resin is the organic high temperature-resistant coating of representative, separately
One kind is refractory inorganic paint.Refractory inorganic paint is of less types, and mechanical property etc. is relatively poor, therefore organic resistance to height
Thermo-paint development is very fast, and its application is also more and more extensive.A master of the high temperature organosilicon paint as high-temperature resistant coating
Kind is wanted, it is typically using silicones as base-material, is equipped with various high temperature resistant face, filler is made.At present, pure organic siliconresin
Si-O key polarity is big, under electrophilic reagent or nucleopilic reagent attack, it is easy to the fracture of key occurs.Therefore, organosilicon fire-resistant
Coating generally requires hot setting, and its mechanical strength, adhesive force and Corrosion Protection are poor (especially resistance to salt water), and due to
The technology evaluation of high-temperature resistant coating and standard differ, and the deviation of high-temperaure coating failure cause analysis, cause high-temperature resistant coating to be protected
It is quite prominent to protect the problem of effect is uneven, after some high temperature facility brushing high-temperature resistant coatings, can't put into operation immediately,
Other equipment high-temperature resistant coating that for example part such as automobile, motorcycle smoke exhaust pipe is applied, often washes away in normal temperature, high temperature and washing
Alternating state, this all requires very harsh to the antiseptic property of high-temperature resistant coating.Therefore, in design high temperature organosilicon paint
During formula, the mechanical performance, heat resistance and anti-corrosion antiseptic property requirement of paint film need to be considered.
Therefore, the heat resistance, mechanical performance and antiseptic property of high temperature organosilicon paint are improved, to organosilicon fire-resistant
Coating has development meaning in the application of modern industry, military affairs, space industry.
The content of the invention
The present invention solves the technical problem of：Poor, the mechanicalness for traditional high temperature organosilicon paint heat resistance
A kind of the shortcomings that energy difference and antiseptic property difference, there is provided preparation method of high temperature organosilicon paint.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：
A kind of preparation method of high temperature organosilicon paint, is concretely comprised the following steps：
（1）It is 10~15% methanol solutions in mass ratio 3 by organic siliconresin and mass fraction：2 are stirred, and sequentially add
The glass dust of organic siliconresin quality 2~5% and the high temperature color stuffing of organic siliconresin quality 10~15%, are stirred, obtain pre-
Coating；
（2）By petroleum coke powder and mix acid liquor in mass ratio 1：1.2~1：1.8 mix 30~60min of reaction, must mix
Liquid, then be 1 in mass ratio：2~1：5 is scattered with ethylene glycol, obtaining Carbonaceous Sol Gel by gained mixed liquor；
（3）By Carbonaceous Sol Gel and tetraethyl orthosilicate in mass ratio 2：1 mixing, is 30~40% sodium hydroxides with mass fraction
Solution adjusts pH to neutrality, adds the oxide nano rare earth of Carbonaceous Sol Gel quality 2~3%, 4~6h of sonic oscillation,
Obtain additive,
（4）By pre- coating and additive in mass ratio 4：3 mixing, obtain high temperature organosilicon paint.
Step（1）The organic siliconresin is any one in benzyl silicones or diphenyl silicone.
Step（1）The high temperature color stuffing is any one in titanium dioxide, talcum powder or aluminium powder.
Step（2）The mix acid liquor configuration process is：Count in parts by weight, it is 98% to take 10~20 parts of mass fractions
Sulfuric acid solution, the salpeter solution that 20~30 parts of mass fractions are 65%, the hydrogen peroxide that 30~40 parts of mass fractions are 30%, 4~8 parts
Potassium permanganate is well mixed, and obtains mix acid liquor.
Step（3）The oxide nano rare earth is any one in nano lanthanum oxide or nano-cerium oxide.
The beneficial effects of the invention are as follows：
（1）Technical solution of the present invention uses the mixture of Carbonaceous Sol Gel and tetraethyl orthosilicate as additive first, on the one hand
Hydrolysis occurs in acid condition for tetraethyl orthosilicate, produces a large amount of Nano-meter SiO_2s2, and it is filled in Carbonaceous Sol Gel network
In structure, then after being mixed with pre- coating, silicone hydroxyl in the organic siliconresin in nano-silica surface silicone hydroxyl and pre- coating
Generation dehydration, makes the quantity of the silicon oxygen bond in coating substantially increase, so that the heat-resisting quantity of high temperature organosilicon paint
It is obviously improved with mechanical performance；On the other hand in SiO2After being reacted with organic siliconresin, Carbonaceous Sol Gel can be scattered in
In coating system, the resistance to elevated temperatures after paint solidification, and the presence of Carbonaceous Sol Gel are further improved, can effectively be avoided
The Korrosionsmediums such as organic solvent directly contact with coating, so that the corrosion resistance of coating gets a promotion, in addition, surely
Qualitative excellent carbonaceous composition, silica bond structure in system can be made more stable in high temperature environments, so addition carbonaceous colloidal sol-
Gel can be such that heat-resisting quantity, anticorrosive property and the mechanical performance of high temperature organosilicon paint is further lifted；
（2）Technical solution of the present invention is used as catalyst by adding oxide nano rare earth in additive, first, in SiO2With
In the reaction of organic siliconresin, oxide nano rare earth has catalytic so that reaction is easily carried out, and the increase of silicon oxygen bond quantity is fast
Speed, secondly, after pre- coating mixes with additive, oxide nano rare earth can be catalyzed organic siliconresin and the methanol in mixture
Reaction, so that the organic group carbochain of institute's band increases on organic siliconresin molecule, so that the heat endurance of coating, the demoulding
Property is got a promotion, and oxide nano rare earth is scattered in the hole of Carbonaceous Sol Gel in addition, due to rare earth oxide have it is resistance to
It is high temperatures, so improving the resistance to elevated temperatures of coating to a certain extent, furthermore add oxide nano rare earth and be filled with charcoal
The hole of matter sol-gel surface so that organic solvent can not osmotic membrane, further increase the corrosion resistance of coating.
Embodiment
First by organic siliconresin and the methanol solution in mass ratio 3 of mass fraction 10~15%：2 add in beaker, and will burn
Cup move into constant temperature blender with magnetic force, under conditions of 30~40 DEG C of temperature, 300~500r/min of rotating speed constant temperature stirring reaction 45~
60min, under constant temperature stirring, by the glass dust of organic siliconresin quality 2~5% and organic siliconresin quality 10~15%
High temperature color stuffing sequentially add in beaker, continue constant temperature 25~35min of stirring reaction, obtain pre- coating；Count in parts by weight, will
The sulfuric acid solution that 10~20 parts of mass fractions are 98%, the salpeter solution that 20~30 parts of mass fractions are 65%, 30~40 parts of quality
Fraction is 30% hydrogen peroxide, and 4~8 parts of potassium permanganate mix 15~20min, obtains mix acid liquor, then by mesh number be 325~
The petroleum coke powder of 500 mesh is 1 in mass ratio with mix acid liquor：1.2~1：1.8 mix 30~60min of reaction, must mix
Liquid, it is then 1 in mass ratio：2~1：5 are scattered in gained mixed liquor in ethylene glycol, obtain Carbonaceous Sol Gel；Carbonaceous is molten
Glue-gel and tetraethyl orthosilicate in mass ratio 2：1 mixing is added in three-necked flask, and three-necked flask immigration digital display is tested the speed constant temperature
Magnetic stirring apparatus, in temperature be 30~35 DEG C, rotating speed be 300~500r/min under the conditions of, constant temperature 80~90min of stirring reaction,
The sodium hydroxide solution that mass fraction is 30~40% is added dropwise into three-necked flask under constant temperature stirring, adjusts three mouthfuls of burnings
Vial material pH is neutral, then the oxide nano rare earth of Carbonaceous Sol Gel quality 2~3% is added in three-necked flask, and will
Three-necked flask moves into sonic oscillation instrument, under the conditions of frequency is 60~80kHz, 4~6h of sonic oscillation, obtains additive；Will precoating
Material and additive in mass ratio 4：3 add in batch mixer, under the conditions of rotating speed is 400~600r/min, are stirred 2~4h,
Discharging, produces high temperature organosilicon paint.The organic siliconresin is any in benzyl silicones or diphenyl silicone
It is a kind of.The high temperature color stuffing is any one in titanium dioxide, talcum powder or aluminium powder.The oxide nano rare earth is nanometer
Any one in lanthana or nano-cerium oxide.
Example 1
First by organic siliconresin and the methanol solution in mass ratio 3 of mass fraction 15%：2 are added in beaker, and beaker is moved into perseverance
Warm magnetic stirring apparatus, the constant temperature stirring reaction 60min under conditions of 40 DEG C of temperature, rotating speed 500r/min, shape is stirred then at constant temperature
Under state, the high temperature color stuffing of the glass dust of organic siliconresin quality 5% and organic siliconresin quality 15% is sequentially added in beaker,
Continue constant temperature stirring reaction 35min, obtain pre- coating；Count in parts by weight, by 20 parts of mass fractions be 98% sulfuric acid solution, 30
The salpeter solution that part mass fraction is 65%, the hydrogen peroxide that 40 parts of mass fractions are 30%, 8 parts of potassium permanganate mix 20min,
Mix acid liquor, then by petroleum coke powder that mesh number is 500 mesh and mix acid liquor be 1 in mass ratio：1.8 mix reaction
60min, mixed liquor is obtained, be then 1 in mass ratio：5 are scattered in gained mixed liquor in ethylene glycol, obtain Carbonaceous Sol Gel；Will
Carbonaceous Sol Gel and tetraethyl orthosilicate in mass ratio 2：1 mixing is added in three-necked flask, and three-necked flask is moved into digital display and surveyed
Fast constant temperature blender with magnetic force, it is 35 DEG C in temperature, rotating speed is the sodium hydroxide solution of 500r/min bars 40%, adjusts three-necked flask
Middle material pH is neutrality, then the oxide nano rare earth of Carbonaceous Sol Gel quality 3% is added in three-necked flask, and three mouthfuls are burnt
Bottle moves into sonic oscillation instrument, under the conditions of frequency is 80kHz, sonic oscillation 6h, obtains additive；Pre- coating and additive are pressed into matter
Measure ratio 4：3 add in batch mixer, under the conditions of rotating speed is 600r/min, are stirred 4h, discharge, and produce organosilicon fire-resistant painting
Material.The organic siliconresin is benzyl silicones.The high temperature color stuffing is titanium dioxide.The oxide nano rare earth is to receive
Rice lanthana.
Example 2
First by organic siliconresin and the methanol solution in mass ratio 3 of mass fraction 15%：2 are added in beaker, and beaker is moved into perseverance
Warm magnetic stirring apparatus, the constant temperature stirring reaction 60min under conditions of 40 DEG C of temperature, rotating speed 500r/min, shape is stirred then at constant temperature
Under state, the high temperature color stuffing of the glass dust of organic siliconresin quality 5% and organic siliconresin quality 15% is sequentially added in beaker,
Continue constant temperature stirring reaction 35min, obtain pre- coating；Count in parts by weight, by 20 parts of mass fractions be 98% sulfuric acid solution, 30
The salpeter solution that part mass fraction is 65%, the hydrogen peroxide that 40 parts of mass fractions are 30%, 8 parts of potassium permanganate mix 20min,
Mix acid liquor, then by petroleum coke powder that mesh number is 500 mesh and mix acid liquor be 1 in mass ratio：1.8 mix reaction
60min, mixed liquor is obtained, be then 1 in mass ratio：5 are scattered in gained mixed liquor in ethylene glycol, obtain Carbonaceous Sol Gel；With
Mass fraction is 40% sodium hydroxide solution, and regulation Carbonaceous Sol Gel pH is neutrality, adds Carbonaceous Sol Gel quality
3% oxide nano rare earth, and under the conditions of supersonic frequency is 80kHz, sonic oscillation 6h, obtain additive；By pre- coating and addition
Agent in mass ratio 4：3 add in batch mixer, under the conditions of rotating speed is 600r/min, are stirred 4h, discharge, it is resistance to produce organosilicon
High-temperature coatings.The organic siliconresin is benzyl silicones.The high temperature color stuffing is titanium dioxide.The nano rare earth oxidation
Thing is nano lanthanum oxide.
Example 3
First by organic siliconresin and the methanol solution in mass ratio 3 of mass fraction 15%：2 are added in beaker, and beaker is moved into perseverance
Warm magnetic stirring apparatus, the constant temperature stirring reaction 60min under conditions of 40 DEG C of temperature, rotating speed 500r/min, shape is stirred then at constant temperature
Under state, the high temperature color stuffing of the glass dust of organic siliconresin quality 5% and organic siliconresin quality 15% is sequentially added in beaker,
Continue constant temperature stirring reaction 35min, obtain pre- coating；Count in parts by weight, by 20 parts of mass fractions be 98% sulfuric acid solution, 30
The salpeter solution that part mass fraction is 65%, the hydrogen peroxide that 40 parts of mass fractions are 30%, 8 parts of potassium permanganate mix 20min,
Mix acid liquor, then by petroleum coke powder that mesh number is 500 mesh and mix acid liquor be 1 in mass ratio：1.8 mix reaction
60min, mixed liquor is obtained, be then 1 in mass ratio：5 are scattered in gained mixed liquor in ethylene glycol, obtain Carbonaceous Sol Gel；Will
Carbonaceous Sol Gel and tetraethyl orthosilicate in mass ratio 2：1 mixing is added in three-necked flask, and three-necked flask is moved into digital display and surveyed
Fast constant temperature blender with magnetic force, it is 35 DEG C in temperature, rotating speed is the sodium hydroxide solution of 500r/min bars 40%, adjusts three-necked flask
Middle material pH is neutrality, obtains additive；By pre- coating and additive in mass ratio 4：3 add batch mixers in, in rotating speed be 600r/
Under the conditions of min, 4h is stirred, discharges, produces high temperature organosilicon paint.The organic siliconresin is benzyl silicones.
The high temperature color stuffing is titanium dioxide.
Comparative example：The organosilicon heat-resistant lacquer of Tianjin coating Co., Ltd production.
The high temperature organosilicon paint of the gained of example 1 to 3 and comparative example product are subjected to performance detection, specific detection method
It is as follows：
1. heat resistance：On tinplate after application high-temperature resistant coating, drying at room temperature 7 days, it is put into Muffle furnace, is transferred to 500
DEG C, test piece is taken out after 1000h, is cooled to room temperature, with amplification sem observation coating surface situation, such as no cracking, obscission, i.e.,
Illustrate that coating resistance to elevated temperatures is good；
2. adhesive force：Tested by GB/T1720；
3. impact strength：Tested by GB/T1732；
4. water resistance：Tested by GB/T1733；
5. resistance to salt water：Tested by GB/T1763.
Specific testing result is as shown in table 1：
Table 1
| Detection project | Example 1 | Example 2 | Example 3 | Comparative example |
| Heat resistance（500 DEG C, 1000h） | Paint film comes off without foaming, no cracking, nothing | Paint film has cracking, nothing comes off without foaming | Paint film no cracking, has and come off without foaming | Paint film has foaming, there is cracking, has and comes off |
| Adhesive force/level | 1 | 2 | 1 | 3 |
| Impact resistance/cm | 50 | 45 | 43 | 30 |
| Water resistance/d | 60 | 59 | 30 | 26 |
| Resistance to 3% salt/d | 35 | 33 | 20 | 14 |
From the testing result of table 1, technical solution of the present invention prepare high temperature organosilicon paint have excellent heat resistance,
Mechanical performance and antiseptic property, to high temperature organosilicon paint in modern industry, military affairs, that the application of space industry has is long-range
Meaning.
Claims (5)
1. a kind of preparation method of high temperature organosilicon paint, it is characterised in that concretely comprise the following steps：
（1）It is 10~15% methanol solutions in mass ratio 3 by organic siliconresin and mass fraction：2 are stirred, and sequentially add
The glass dust of organic siliconresin quality 2~5% and the high temperature color stuffing of organic siliconresin quality 10~15%, are stirred, obtain pre-
Coating；
（2）By petroleum coke powder and mix acid liquor in mass ratio 1：1.2~1：1.8 mix 30~60min of reaction, must mix
Liquid, then be 1 in mass ratio：2~1：5 is scattered with ethylene glycol, obtaining Carbonaceous Sol Gel by gained mixed liquor；
（3）By Carbonaceous Sol Gel and tetraethyl orthosilicate in mass ratio 2：1 mixing, is 30~40% sodium hydroxides with mass fraction
Solution adjusts pH to neutrality, adds the oxide nano rare earth of Carbonaceous Sol Gel quality 2~3%, 4~6h of sonic oscillation,
Obtain additive,
（4）By pre- coating and additive in mass ratio 4：3 mixing, obtain high temperature organosilicon paint.
A kind of 2. preparation method of high temperature organosilicon paint according to claim 1, it is characterised in that：Step（1）Institute
Organic siliconresin is stated as any one in benzyl silicones or diphenyl silicone.
A kind of 3. preparation method of high temperature organosilicon paint according to claim 1, it is characterised in that：Step（1）Institute
High temperature color stuffing is stated as any one in titanium dioxide, talcum powder or aluminium powder.
A kind of 4. preparation method of high temperature organosilicon paint according to claim 1, it is characterised in that：Step（2）Institute
Stating mix acid liquor configuration process is：Count in parts by weight, take 10~20 parts of mass fractions be 98% sulfuric acid solution, 20~30 parts
Mass fraction is 65% salpeter solution, the hydrogen peroxide that 30~40 parts of mass fractions are 30%, and 4~8 parts of potassium permanganate are well mixed,
Obtain mix acid liquor.
A kind of 5. preparation method of high temperature organosilicon paint according to claim 1, it is characterised in that：Step（3）Institute
Oxide nano rare earth is stated as any one in nano lanthanum oxide or nano-cerium oxide.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111348918A (en) * | 2020-03-11 | 2020-06-30 | 上海德宝密封件有限公司 | Boron nitride coating process for preventing graphite plate from being damaged |
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|---|---|---|---|---|
| CN111348918A (en) * | 2020-03-11 | 2020-06-30 | 上海德宝密封件有限公司 | Boron nitride coating process for preventing graphite plate from being damaged |
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