CN114644849A - Safe diluent for organic silicon coating and preparation method thereof - Google Patents
Safe diluent for organic silicon coating and preparation method thereof Download PDFInfo
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- CN114644849A CN114644849A CN202210107588.5A CN202210107588A CN114644849A CN 114644849 A CN114644849 A CN 114644849A CN 202210107588 A CN202210107588 A CN 202210107588A CN 114644849 A CN114644849 A CN 114644849A
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention provides a safe diluent for an organic silicon coating and a preparation method thereof, wherein the safe diluent comprises the following components in percentage by mass: 20 to 70 percent of fluorine-containing hydrocarbon; 10 to 40 percent of organic ester; 0-30% of micromolecular siloxane; 10 to 30 percent of aliphatic hydrocarbon. The prepared diluent has a closed flash point of more than 60 ℃. The preparation method comprises the following steps: mixing and stirring the micromolecular siloxane, the organic ester and the aliphatic hydrocarbon according to a proportion to obtain a mixed solution, fully stirring the mixed solution and the fluorine-containing hydrocarbon according to a proportion, and standing to obtain the safe diluent for the organic silicon coating.
Description
Technical Field
The invention belongs to the technical field of coating compositions, and particularly relates to a safe diluent for an organic silicon coating and a preparation method thereof.
Background
Due to the unique silicon-oxygen bond molecular structure of the organic silicon, the organic silicon endows the material with excellent heat resistance, weather resistance, antifouling property, wear resistance and the like, and is widely used in the field of special coatings. However, due to the special silicon-oxygen bond structure of the organic silicon, the solubility of the organic silicon is different from that of the traditional acrylic coating and alkyd coating, and no special safe diluent for the organic coating exists at present. At present, diluents of organic silicon coatings are mainly gasoline, toluene, xylene and the like, and cause great hidden dangers to personal safety and health.
According to research, in the military field, SLA-561S organic silicon-based ablation heat-proof coating developed by Luomax corporation of America is used for Mars detectors, the coating thickness is large, hydrocarbon solvent is used as diluent for improving the volatilization speed of the coating, the flash point of the coating is still low, the hidden danger of electrostatic ignition exists, and the safety coefficient is poor; the organic silicon antistatic coating used by French MAP company uses the mixture of esters, hydrocarbons and the like to replace gasoline solvents, but still has higher safety risk; in order to ensure the sufficient volatilization of the diluent, gasoline is mostly used as the diluent, so that the safety risk is higher. The AMERCOAT diluent used by PPG company is specially used for spraying the organic silicon protective coating (such as PSX series), the diluent is a mixed solvent of esters and the like, the hidden danger of electrostatic ignition is greatly reduced, but the closed flash point is still higher; DOWSIL series organosilicon coatings used by DOW company still adopt one or two of dimethylbenzene and methylbenzene as diluents, which causes great hidden danger to human health. Therefore, in the field of organic silicon coatings, a nontoxic safe diluent is urgently needed to meet the requirement of safe use of the coatings.
TABLE 1 statistics of silicone diluents used in the aerospace and industrial fields
Disclosure of Invention
In order to overcome the defects in the prior art, the inventor of the invention carries out intensive research, provides a safe diluent for an organic silicon coating and a preparation method thereof, and solves the problem of great hidden danger of the diluent used in the existing organic silicon coating on personal safety and health, thereby completing the invention.
The technical scheme provided by the invention is as follows:
in a first aspect, the safe diluent for the organic silicon coating comprises the following components in percentage by mass:
in a second aspect, a method for preparing a safe diluent for a silicone coating includes the steps of: mixing micromolecular siloxane, organic ester and aliphatic hydrocarbon according to a proportion to obtain a mixed solution, fully mixing the mixed solution and the fluorine-containing hydrocarbon according to a proportion, and standing to obtain the safe diluent for the organic silicon coating.
According to the safe diluent for the organic silicon coating and the preparation method thereof, the safe diluent has the following beneficial effects:
(1) according to the safe diluent for the organic silicon coating and the preparation method thereof, the used fluorine-containing hydrocarbon, aliphatic hydrocarbon, organic ester and micromolecular siloxane are used independently to have poor dissolving effect on organic silicon, but the fluorine-containing hydrocarbon, the aliphatic hydrocarbon, the organic ester and the micromolecular siloxane are mixed according to a certain proportion to have good dissolving power on organic silicon, so that the synergistic effect of all the materials is fully exerted, the closed flash points of the aliphatic hydrocarbon, the organic ester and the micromolecular siloxane are all less than 60 ℃, the safety risk is high, the materials are compounded according to a proper proportion, the closed flash point is finally more than 60 ℃, the safety is greatly improved, and the storage and use cost is reduced;
(2) according to the safe diluent for the organic silicon coating, the components of the diluent are low in toxicity after being compounded, so that the safety hazard to human bodies is greatly reduced;
(3) according to the safe diluent for the organic silicon coating, the electrostatic potential of the diluent in the spraying process is 0, the electrostatic ignition risk in the spraying process is reduced, and the safety is improved;
(4) the safe diluent for the organic silicon coating provided by the invention has the advantages of simple and easily obtained raw materials, very convenient preparation and use processes, and capability of being used as a diluent for various organic silicon coatings.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The invention provides a safe diluent for an organic silicon coating, which comprises the following components in percentage by mass:
the sum of the mass percentage of each component is 100 percent.
The present inventors have determined through extensive studies that the above diluent components do not have a closed flash point, have an electrostatic potential of 0 during spraying, and have good solubility for addition-type silicone and condensation-type silicone coatings.
In a preferred embodiment, the fluorine-containing hydrocarbon is selected from at least one of monofluorodichloroethane or 3, 3-dichloro-1, 1,1,2, 2-pentafluoropropane.
In a preferred embodiment, the organic ester is selected from at least one of butyl acetate or ethyl acetate.
In a preferred embodiment, the small molecule siloxane is selected from at least one of hexamethyldisiloxane or octamethyltrisiloxane, mainly to increase the solvency for the phenyl-containing silicone coating.
In a preferred embodiment, the aliphatic hydrocarbon is selected from at least one of n-hexane, n-heptane or n-dodecane.
In the present invention, the diluent is suitable for addition type organosilicon and condensed type organosilicon coatings, including but not limited to TL-5 ablative thermal barrier coatings developed by the aerospace materials and Process research institute, TR-52 ablative thermal barrier coatings, and the like.
In the invention, the diluent is suitable for spraying the organic silicon coating with the coating thickness of 0.5-6.0 mm.
The invention also provides a preparation method of the safe diluent for the organic silicon coating, which comprises the following steps: mixing micromolecular siloxane, organic ester and aliphatic hydrocarbon according to a proportion to obtain a mixed solution, fully mixing the mixed solution and the fluorine-containing hydrocarbon according to a proportion, and standing to obtain the safe diluent for the organic silicon coating.
Examples
Example 1
According to the mass ratio, 70 percent of monofluoro dichloroethane, 20 percent of butyl acetate and 10 percent of n-heptane are taken. The raw materials of butyl acetate and n-heptane are put into a stirring kettle at normal temperature and normal pressure, stirred for 5 minutes, added with monofluorodichloroethane and stirred to obtain the product, and then the product is packaged. The environment-friendly pollution-free diluent has strong solubility on organosilicon coatings (TL-5 ablative insulation coatings), has good atomization effect during the spraying process, and ensures that sprayed coating particles are fine and uniform; an electrostatic potential tester is adopted to monitor the electrostatic potential in the spraying process, the electrostatic potential in the whole process is 0kV, and the safety is high; the performance is stable, the coating thickness (2.0-2.5 mm) and the basic mechanical property (tensile strength 1.98MPa) of the coating obtained by spraying the solvent reach the standard (QS 227-79 TL-5 ablative thermal insulation coating technical condition of aerospace materials and Process research institute), and the diluent does not contain benzene components, thereby meeting the environmental protection requirement.
Example 2
According to the mass ratio, 40 percent of monofluoro dichloroethane, 20 percent of butyl acetate, 20 percent of octamethyltrisiloxane and 20 percent of n-heptane are taken. The raw materials of butyl acetate, octamethyltrisiloxane and n-heptane are placed into a stirring kettle at normal temperature and normal pressure, stirred for 5 minutes, added with monofluorodichloroethane and stirred to obtain the product, and then the product is packaged. The environment-friendly pollution-free diluent has strong solubility on coatings of organic silicon (containing phenyl TR-52 ablative heat-proof coatings), has good atomization effect in the spraying process, and ensures that sprayed coating particles are fine and uniform; an electrostatic potential tester is adopted to monitor the electrostatic potential in the spraying process, the electrostatic potential in the whole process is 0kV, and the safety is high; the performance is stable, the coating thickness (5.0-5.5 mm) and the basic mechanical property (tensile strength 1.48MPa) of the coating obtained by spraying the solvent all reach the standard (technical conditions of TR-52 ablation heat-proof coating of aerospace materials and Process research institute DqJT 1759), and the diluent does not contain benzene components and meets the requirement of environmental protection.
Example 3
50 percent of monofluorodichloroethane, 20 percent of butyl acetate and 30 percent of n-heptane are taken according to the mass ratio. The raw materials are put into a stirring kettle at normal temperature and normal pressure in butyl acetate and n-heptane, stirred for 5 minutes, added with monofluoro dichloroethane and stirred to obtain the product, and then the product is packaged. The environment-friendly pollution-free diluent has strong solubility to organosilicon coatings (here, TL-5 ablative heat insulation coatings), has good atomization effect during the spraying process, and ensures that sprayed coating particles are fine and uniform; an electrostatic potential tester is adopted to monitor the electrostatic potential in the spraying process, the electrostatic potential in the whole process is 0kV, and the safety is high; the solvent has stable performance, the coating thickness (4.0-4.5 mm) and the basic mechanical property (tensile strength 1.98MPa) of the coating obtained by spraying the solvent meet the standard (technical conditions for TL-5 ablative thermal insulation coating of aerospace materials and Process research institute QS 227-79), and the diluent does not contain benzene components and meets the requirement of environmental protection.
The diluents prepared in examples 1 to 3 above were subjected to the following tests strictly in accordance with the relevant standards, and the test results were as follows:
1. flash point
The diluent is subjected to a closed flash point test according to SH/T0768-2005, and the closed flash point is more than 60 ℃, so that the safety is good.
2. Animal toxicity test LD50
The diluent is tested for toxicity according to GB/T21804-2008, the LD50 is more than or equal to 5000mg/kg, and the diluent is judged to be in a low-toxicity state or an actual non-toxicity state.
3. Long term storage stability
The test was carried out according to ASTM F1104 with a low temperature of 15 days and a high temperature of 15 days, and the diluent after the test was uniform, without delamination and without precipitation and floc precipitation.
4. Test of Cold thermal stability
The method is carried out according to the requirements of HB5334-85, and the product after the test has no demixing, precipitation, flocculate precipitation and the like.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (8)
1. The safe diluent for the organic silicon coating is characterized by comprising the following components in percentage by mass:
2. the safety diluent for silicone coatings according to claim 1, characterized in that the fluorine-containing hydrocarbon is selected from at least one of monofluorodichloroethane or 3, 3-dichloro-1, 1,1,2, 2-pentafluoropropane.
3. The safety diluent for silicone coatings according to claim 1, characterized in that the organic ester is selected from at least one of butyl acetate or ethyl acetate.
4. A safety diluent for silicone coatings according to claim 1, characterized in that the small molecule siloxane is selected from at least one of hexamethyldisiloxane or octamethyltrisiloxane.
5. Safety diluent for silicone coatings according to claim 1, characterized in that the aliphatic hydrocarbon is selected from at least one of n-hexane, n-heptane or n-dodecane.
6. A safety diluent for silicone coatings according to claim 1, characterized in that the diluent has a closed flash point of greater than 60 ℃ and a spray process electrostatic potential of 0.
7. The safe diluent for the organic silicon coating as claimed in claim 1, wherein the diluent is suitable for the organic silicon coating with the thickness of a spray coating layer of 0.5-6.0 mm.
8. A preparation method of a safe diluent for an organic silicon coating is characterized by comprising the following steps: mixing micromolecular siloxane, organic ester and aliphatic hydrocarbon according to a proportion to obtain a mixed solution, fully mixing the mixed solution and the fluorine-containing hydrocarbon according to a proportion, and standing to obtain the safe diluent for the organic silicon coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210107588.5A CN114644849A (en) | 2022-01-28 | 2022-01-28 | Safe diluent for organic silicon coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210107588.5A CN114644849A (en) | 2022-01-28 | 2022-01-28 | Safe diluent for organic silicon coating and preparation method thereof |
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| CN114644849A true CN114644849A (en) | 2022-06-21 |
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Citations (8)
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|---|---|---|---|---|
| JP2005097248A (en) * | 2003-08-25 | 2005-04-14 | Asahi Glass Co Ltd | Solvent for diluting organic chemical substance, lubricant solution and method of coating lubricant |
| JP2006274173A (en) * | 2005-03-30 | 2006-10-12 | Asahi Glass Co Ltd | Azeotrope solvent composition and mixed solvent composition |
| US20120107513A1 (en) * | 2009-07-16 | 2012-05-03 | Central Glass Company, Limited | Solvent Composition for Silicone Compound |
| CN108884422A (en) * | 2016-01-15 | 2018-11-23 | Ａｇｃ株式会社 | Solvent compositions, cleaning method, the forming method of film, heat-conduction medium and heat circulating system |
| CN109536015A (en) * | 2018-11-06 | 2019-03-29 | 航天材料及工艺研究所 | A kind of thermal protective coating and preparation method thereof |
| JP2020041087A (en) * | 2018-09-12 | 2020-03-19 | Ａｇｃ株式会社 | Solvent composition, cleaning method, and method for manufacturing substrate with coating film |
| CN111440531A (en) * | 2020-05-14 | 2020-07-24 | 成都拓利科技股份有限公司 | Solvent-free moisture-curing type organic silicon coating and preparation method thereof |
| CN113072880A (en) * | 2021-04-06 | 2021-07-06 | 湖北隆胜四海新材料股份有限公司 | Organic silicon resin composition and preparation method and application thereof |
-
2022
- 2022-01-28 CN CN202210107588.5A patent/CN114644849A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005097248A (en) * | 2003-08-25 | 2005-04-14 | Asahi Glass Co Ltd | Solvent for diluting organic chemical substance, lubricant solution and method of coating lubricant |
| JP2006274173A (en) * | 2005-03-30 | 2006-10-12 | Asahi Glass Co Ltd | Azeotrope solvent composition and mixed solvent composition |
| US20120107513A1 (en) * | 2009-07-16 | 2012-05-03 | Central Glass Company, Limited | Solvent Composition for Silicone Compound |
| CN108884422A (en) * | 2016-01-15 | 2018-11-23 | Ａｇｃ株式会社 | Solvent compositions, cleaning method, the forming method of film, heat-conduction medium and heat circulating system |
| JP2020041087A (en) * | 2018-09-12 | 2020-03-19 | Ａｇｃ株式会社 | Solvent composition, cleaning method, and method for manufacturing substrate with coating film |
| CN109536015A (en) * | 2018-11-06 | 2019-03-29 | 航天材料及工艺研究所 | A kind of thermal protective coating and preparation method thereof |
| CN111440531A (en) * | 2020-05-14 | 2020-07-24 | 成都拓利科技股份有限公司 | Solvent-free moisture-curing type organic silicon coating and preparation method thereof |
| CN113072880A (en) * | 2021-04-06 | 2021-07-06 | 湖北隆胜四海新材料股份有限公司 | Organic silicon resin composition and preparation method and application thereof |
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