CN113122135A - Anti-sticking coating for automobile cylinder gasket and preparation method thereof - Google Patents
Anti-sticking coating for automobile cylinder gasket and preparation method thereof Download PDFInfo
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- CN113122135A CN113122135A CN202110411376.1A CN202110411376A CN113122135A CN 113122135 A CN113122135 A CN 113122135A CN 202110411376 A CN202110411376 A CN 202110411376A CN 113122135 A CN113122135 A CN 113122135A
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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
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/24—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen halogen-containing groups
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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
- 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
- C09D7/65—Additives macromolecular
Abstract
The invention relates to an anti-sticking coating for a vehicle cylinder gasket and a preparation method thereof. The anti-sticking coating for the automobile cylinder gasket comprises: 1-20 parts of fluorine-containing silane; 20-50 parts of alkoxy end-capped siloxane polymer; 20-50 parts of hydroxylated polysiloxane; 0.1-5 parts of brightening agent; 10-70 parts of a diluent; 0.1-10 parts of a silane coupling agent. The invention also comprises a preparation method of the coating, which comprises the steps of mixing the fluorine-containing silane, the hydroxylated polysiloxane, the alkoxy end-capped siloxane polymer and the brightening agent, dripping a hydrochloric acid solution at 50-90 ℃, refluxing, adding hexamethyldisilazane, adjusting the pH value to 6.5-7.5, heating to above 100 ℃, adding a diluent, cooling, and adding a silane coupling agent to obtain the anti-sticking coating for the automobile cylinder gasket. The anti-sticking coating for the automobile cylinder gasket improves the elasticity of the coating, has excellent sealing performance, fluorine-containing silicon structure and good high-temperature anti-sticking and isolating performance.
Description
Technical Field
The invention relates to the technical field of organosilicon anti-sticking coatings, in particular to an anti-sticking coating for a vehicle cylinder gasket and a preparation method thereof.
Background
The cylinder gasket is located between the cylinder head and the cylinder block, and is also called a cylinder bed. The sealing structure has the functions of filling up microscopic pores between the cylinder body and the cylinder cover, ensuring good sealing performance at a joint surface, further ensuring sealing of a combustion chamber, and preventing air leakage of the cylinder and water leakage of a water jacket.
With the continuous strengthening of internal combustion engines, the thermal load and mechanical load are constantly increasing, the sealing performance of the cylinder gasket is more and more important, and the requirements on the structure and the material are as follows: the high-temperature high-pressure gas-fired boiler has enough strength, heat resistance, corrosion resistance and certain elasticity under the action of high-temperature high-pressure and high-corrosion gas, can compensate the unevenness of a joint surface so as to ensure sealing, has long service life and is convenient to maintain and disassemble.
Currently, the following cylinder gaskets are more used: one is a metal/asbestos cylinder gasket, the asbestos is sandwiched with metal wires or metal scraps, and is externally coated with a copper sheet or a steel sheet, the thickness of the steel gasket is 1.2-2 mm, the heat resistance is good, the steel gasket can be repeatedly used, but the strength is poor, and the thickness and the quality are not uniform; the other is made of solid metal sheets, the gasket is mainly used for strengthening an engine, the gasket is mainly used for cars and racing cars, the gasket is provided with raised lines with certain height punched around cylinder holes, water holes and oil holes which need to be sealed, and the sealing is realized by utilizing the elastic deformation of the raised lines; the two cylinder cushions are hard seals, have poor elasticity, and are easy to damage the cylinder body in the fastening or dismounting process. In addition, a cylinder head gasket which is formed by pressing asbestos and rubber adhesive on two sides of a framework by adopting a woven steel wire mesh or a perforated steel plate at the center is adopted, but the cylinder head gasket is easy to adhere to a cylinder body and is inconvenient to disassemble.
The cylinder gasket is coated with an anti-sticking isolation coating on the surface, so that the sealing effect and the corrosion resistance of the cylinder gasket are improved, but the existing coating needs high-temperature curing, has short storage period, is easy to adhere to a cylinder in a high-temperature environment, or greatly reduces the isolation effect.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to obtain the high-temperature anti-sticking coating.
In order to solve the technical problems, the invention provides an anti-sticking coating for a vehicle cylinder gasket and a preparation method thereof.
The invention provides an anti-sticking coating for a vehicle cylinder gasket, which comprises the following components in parts by weight:
further, the fluorine-containing silane is one or more of 3,3, 3-trifluoropropylmethyldimethoxysilane, perfluorooctyltriethoxysilane and perfluorodecyltrimethoxysilane.
Further, the alkoxy-terminated siloxane polymer has the following structural formula:
R1O-[SiO(R2)2]a-[SiO3/2R3]b-R3[SiO2]c-OR1
wherein R is1、R2Or R3Each being a carbon atom number C1～C2Alkyl or alkoxy of (a); a. b is an integer of 0 to 50.
Further, the hydroxylated polysiloxane has the following structural formula:
HO-[SiO(R4)2]d-[SiO3/2R5]e-OH
R4、R5are each a carbon atom number C1～C2One of alkyl or alkoxy of (a); c. d and e are positive integers greater than or equal to 0.
Further, the brightening agent is one or more of methyl cellulose, ethyl cellulose and hydroxyethyl cellulose.
Further, the diluent is one or more of methanol, ethanol and isopropanol.
The invention also provides a preparation method of the anti-sticking coating for the automobile cylinder gasket, which comprises the following steps:
according to the weight parts, fluorine-containing silane, hydroxylated polysiloxane, alkoxy end-capped siloxane polymer and brightening agent are mixed, 0.5-0.8% hydrochloric acid solution is dropwise added at 50-90 ℃, after dropwise addition, heat preservation and reflux reaction are carried out for 0.5-3 hours, hexamethyldisilazane is added, the pH value is adjusted to 6.5-7.5, the mixture is heated to above 100 ℃ and vacuumized, then diluent is added, the temperature is reduced to 50-55 ℃, and then silane coupling agent is added to obtain the anti-sticking coating for the automobile cylinder gasket.
Further, the hydroxylated polysiloxane is prepared by the following steps: and dripping siloxane monomers into a reaction container containing a mixture of toluene and water at the temperature of 25-35 ℃, continuously stirring after dripping is finished, and then removing acid water and toluene to obtain the hydroxylated polysiloxane.
Further, the alkoxy-terminated siloxane polymer is prepared by the steps of: dropwise adding a mixture of water and alcohol into a reaction container containing a mixture of silane monomers, alcohol and acidic ion exchange resin at 25-45 ℃, continuously stirring after dropwise adding, heating and refluxing, and removing the ion exchange resin and the solvent to obtain the alkoxy-terminated siloxane oligomer.
Further, the heating reflux time is 3-4 hours.
Compared with the prior art, the invention has the advantages that: the anti-sticking coating for the automobile cylinder gasket comprises 1-20 parts by weight of fluorine-containing silane; 20-50 parts of alkoxy end-capped siloxane polymer; 20-50 parts of hydroxylated polysiloxane; 0.1-5 parts of brightening agent; 10-70 parts of a diluent; 0.1-10 parts of a silane coupling agent; the anti-sticking coating main body of the automobile cylinder gasket is of a fluorine-containing polysiloxane DTQ structure, and has both rigidity and ductility, so that a cured coating has excellent elasticity, excellent sealing performance and good high-temperature anti-sticking and isolating performance.
Detailed Description
The specific embodiment provides an anti-sticking coating for a vehicle cylinder gasket, which comprises the following components in parts by weight:
in this embodiment, the fluorine-containing silane is one or more of 3,3, 3-trifluoropropylmethyldimethoxysilane, perfluorooctyltriethoxysilane, and perfluorodecyltrimethoxysilane.
In this embodiment, the alkoxy-terminated siloxane polymer has the following structural formula:
R1O-[SiO(R2)2]a-[SiO3/2R3]b-R3[SiO2]c-OR1
wherein R is1、R2Or R3Each being a carbon atom number C1～C2One of alkyl or alkoxy of (a); a. b and c are integers of 0-50.
In this embodiment, the hydroxylated polysiloxane has the following structural formula:
HO-[SiO(R4)2]d-[SiO3/2R5]e-OH
R4、R5are each a carbon atom number C1～C2One of alkyl or alkoxy of (a); d. e is a positive integer greater than 0.
In this embodiment, the brightening agent is one or more of methyl cellulose, ethyl cellulose, and hydroxyethyl cellulose.
In the embodiment, the diluent is one or more of methanol, ethanol and isopropanol, and the silane coupling agent is KH-550 or KH-560.
The specific embodiment further comprises a preparation method of the anti-sticking coating for the automobile cylinder gasket, which comprises the following steps:
preparation of alkoxy-terminated siloxane polymers: dropwise adding a mixture obtained by mixing water and alcohol according to a mass ratio of 1:2-3 into a reaction container containing a siloxane monomer, alcohol and acidic ion exchange resin mixture at 25-45 ℃, continuously stirring for 1-1.5h after dropwise adding, then heating and refluxing for 3-4 h, filtering to remove the ion exchange resin, and evaporating solvent alcohol at normal pressure to obtain the alkoxy end-capped siloxane polymer; the siloxane monomer comprises, by weight, 5-60 parts of methyltrimethoxysilane, 10-50 parts of dimethyldimethoxysilane, 0-10 parts of tetramethyl silicate and 5-20 parts of tetraethyl silicate;
preparation of hydroxylated polysiloxane: dropwise adding a silane monomer into a reaction container with a mixture of toluene and water at 25-35 ℃, continuously stirring after dropwise adding, standing for layering to remove acid water, and distilling to remove a solvent toluene to obtain the hydroxylated polysiloxane; the silane monomer comprises, by weight, 5-30 parts of methyltrichlorosilane and 50-100 parts of dimethyldichlorosilane;
according to the weight parts, fluorine-containing silane, hydroxylated polysiloxane, alkoxy end-capped siloxane polymer and brightening agent are mixed, 0.5-0.8% hydrochloric acid solution is dropwise added at 50-90 ℃, after dropwise addition, heat preservation and reflux reaction are carried out for 0.5-3 hours, hexamethyldisilazane is added, the pH value is adjusted to 6.5-7.5, the mixture is heated to above 100 ℃ and vacuumized, then diluent is added, the temperature is reduced to 50-55 ℃, and then silane coupling agent is added, and heat preservation is carried out for 1-2 hours, so that the anti-sticking coating for the automobile cylinder pad is obtained.
The following detailed description of the preferred embodiments of the invention is provided to illustrate the principles of the invention and not to limit the scope of the invention.
Example 1
The anti-sticking coating for the automobile cylinder gasket is prepared by the following steps:
accurately weighing 10 parts of 3,3, 3-trifluoropropylmethyldimethoxysilane with the structure of R according to parts by weight1O-[SiO(R2)2]40-[SiO3/2R3]10-R3[SiO2]10-OR130 parts of methoxy terminated siloxane polymer with the structure of HO- [ SiO (R)4)2]14-[SiO3/2R5]125 parts of-OH hydroxylated polysiloxane and 5 parts of brightening agent methyl cellulose, and heating toAnd (2) dripping 10 parts of 0.5% hydrochloric acid solution at 78 ℃, preserving heat, performing reflux reaction for 2 hours after dripping, adding 0.5 part of hexamethyldisilazane, adjusting the pH value to 7.0, heating to above 100 ℃, vacuumizing, removing low-boiling-point substances, adding 50 parts of diluent methanol, cooling to 50 ℃, and adding 5 parts of KH-550 silane coupling agent to obtain the final product.
Further, the methoxy-terminated siloxane polymer described in this example was prepared by: accurately weighing 136g of methyltrimethoxysilane, 480g of dimethyldimethoxysilane, 152g of tetraethyl silicate, 6.5g of acidic ion exchange resin and 130g of methanol in a reaction bottle, dropwise adding a mixture of 50g of water and 100g of methanol into the reaction bottle at 25 ℃, controlling the dropwise adding speed, continuously stirring for 1h, heating to the reflux temperature, refluxing for 3h, cooling, filtering to remove the ion exchange resin, and distilling at normal pressure to remove the solvent to obtain the alkoxy-terminated siloxane polymer.
Further, the hydroxylated polysiloxane in this example was prepared by the following steps: accurately weighing 15g of methyltrichlorosilane, 180g of dimethyldichlorosilane and 200g of toluene at 35 ℃, uniformly mixing, dropwise adding the mixture into a reaction bottle filled with 300g of toluene and 850g of water, controlling the dropwise adding speed, continuously stirring for 1h, transferring the material into a separating funnel, standing for layering, removing acid water, washing to be neutral, transferring the material into a clean reaction bottle, and distilling to remove part of toluene to obtain the hydroxylated polysiloxane solution with the solid content of 80%.
Example 2
The anti-sticking coating for the automobile cylinder gasket is prepared by the following steps:
accurately weighing 5 parts of 3,3, 3-trifluoropropylmethyldimethoxysilane with the structure of R according to parts by weight1O-[SiO(R2)2]20-[SiO3/2R3]12-R3[SiO2]5-OR140 parts of alkoxy-terminated siloxane polymer with the structure of HO- [ SiO (R)4)2]20-[SiO3/2R5]328 parts of-OH hydroxylated polysiloxane and 1 part of brightening agent ethyl fiberHeating to 77 ℃, dropwise adding 10 parts of 0.5% hydrochloric acid solution, preserving heat after dropwise adding, performing reflux reaction for 1.5 hours, adding 0.5 part of hexamethyldisilazane, adjusting the pH value to 7.0, heating to above 100 ℃, vacuumizing, removing low-boiling-point substances, then adding 60 parts of isopropanol serving as a diluent, cooling to 50 ℃, and adding 10 parts of KH-550 silane coupling agent to obtain a final product.
Further, the methoxy-terminated siloxane polymer described in this example was prepared by: accurately weighing 50g of methyltrimethoxysilane, 100g of methyltriethoxysilane, 360g of dimethyl dimethoxysilane, 45g of tetramethyl silicate, 80g of tetraethyl silicate, 5.5g of acidic ion exchange resin and 150g of methanol in a reaction bottle, dropwise adding a mixture of 60g of water and 120g of methanol into the reaction bottle at 45 ℃, controlling the dropwise adding speed, completing dropwise adding within 3h, continuously stirring for 1h, heating to the reflux temperature, refluxing for 3h, cooling, filtering to remove the ion exchange resin, and distilling at normal pressure to remove the solvent to obtain the alkoxy-terminated siloxane oligomer.
Further, the hydroxylated polysiloxane in this example was prepared by the following steps: accurately weighing 60g of methyltrichlorosilane, 150g of dimethyldichlorosilane and 210g of toluene at 25-35 ℃, uniformly mixing, dropwise adding into a reaction bottle filled with 320g of toluene and 900g of water, controlling the dropwise adding speed, and completing dropwise adding within 3 h. And after continuously stirring for 1h, transferring the material into a separating funnel, standing for layering, removing acid water, washing with water to be neutral, transferring the material into a clean reaction bottle, and distilling to remove partial toluene to obtain the hydroxylated organopolysiloxane solution with the solid content of 80%.
Example 3
The anti-sticking coating for the automobile cylinder gasket is prepared by the following steps:
accurately weighing 15 parts of 3,3, 3-trifluoropropylmethyldimethoxysilane with the structure of R1O-[SiO(R2)2]20-[SiO3/2R3]12-R3[SiO2]5-OR135 parts of alkoxy-terminated siloxane polymer with the structure of HO- [ SiO (R)4)2]30-[SiO3/2R5]4heating-OH hydroxylated polysiloxane 50 parts and brightening agent hydroxyethyl cellulose 2 parts to 78 ℃, dropwise adding 0.8% hydrochloric acid solution 8 parts, after dropwise adding, preserving heat, performing reflux reaction for 2 hours, adding hexamethyldisilazane 0.4 part, adjusting the pH value to 7.0, heating to more than 100 ℃, vacuumizing, removing low-boiling-point substances, then adding diluting agent ethanol 40 parts, cooling to 45 ℃, and adding KH-560 silane coupling agent 4 parts to obtain the final product.
Further, the methoxy-terminated siloxane polymer described in this example was prepared by: accurately weighing 78g of methyltriethoxysilane, 245g of dimethyldimethoxysilane, 152g of tetramethyl silicate, 6.5g of acidic ion exchange resin and 120g of methanol in a reaction bottle, dropwise adding a mixture of 50g of water and 100g of methanol into the reaction bottle at the temperature of 30 ℃, controlling the dropwise adding speed, continuously stirring for 1-2 h, heating to the reflux temperature, refluxing for 3h, cooling, filtering to remove the ion exchange resin, and distilling at normal pressure to remove the solvent to obtain the alkoxy-terminated siloxane polymer.
Further, the hydroxylated polysiloxane in this example was prepared by the following steps: accurately weighing 28g of methyltrichlorosilane, 330g of dimethyldichlorosilane and 230g of toluene at 28 ℃, uniformly mixing, dropwise adding the mixture into a reaction bottle filled with 300g of toluene and 780g of water, controlling the dropwise adding speed, continuously stirring for 2 hours, transferring the material into a separating funnel, standing for layering, removing acid water, washing to be neutral, transferring the material into a clean reaction bottle, and distilling to remove part of toluene to obtain 82.5% solid content hydroxylated polysiloxane solution.
Example 4
The alkoxy-terminated siloxane polymer and the hydroxylated polysiloxane in this example were the same as in example 1.
The anti-sticking coating for the automobile cylinder gasket is prepared by the following steps:
accurately weighing 2 parts of perfluorooctyl triethoxysilane, 50 parts of alkoxy-terminated siloxane polymer, 20 parts of hydroxylated polysiloxane and 1 part of brightening agent methylcellulose, heating to 78 ℃, dropwise adding 8 parts of 0.6% hydrochloric acid solution, preserving heat after dropwise adding, performing reflux reaction for 2 hours, adding 0.5 part of hexamethyldisilazane, adjusting the pH value to 7.0, heating to 110 ℃, vacuumizing, removing low-boiling-point substances, then adding 50 parts of diluent ethanol, cooling to 50 ℃, and adding 1 part of silane coupling agent to obtain the final product.
Further, the alkoxy-terminated siloxane polymer in this example was prepared by the following steps: accurately weighing 50g of methyltrimethoxysilane, 100g of methyltriethoxysilane, 360g of dimethyl dimethoxysilane, 45g of tetramethyl silicate, 80g of tetraethyl silicate, 5.5g of acidic ion exchange resin and 150g of methanol in a reaction bottle, dropwise adding a mixture of 60g of water and 120g of methanol into the reaction bottle at 45 ℃, controlling the dropwise adding speed, completing dropwise adding within 3h, continuously stirring for 1.5h, heating to the reflux temperature, refluxing for 4h, cooling, filtering to remove the ion exchange resin, and distilling at normal pressure to remove the solvent to obtain the alkoxy-terminated siloxane polymer.
Further, the hydroxylated polysiloxane in this example was prepared by: accurately weighing 60g of methyltrichlorosilane, 150g of dimethyldichlorosilane and 210g of toluene at 25-35 ℃, uniformly mixing, dropwise adding into a reaction bottle filled with 320g of toluene and 900g of water, controlling the dropwise adding speed, and completing dropwise adding within 3 h. And after continuously stirring for 1h, transferring the material into a separating funnel, standing for layering, removing acid water, washing with water to be neutral, transferring the material into a clean reaction bottle, and distilling to remove partial toluene to obtain the 80% solid content hydroxylated polysiloxane solution.
Example 5
The alkoxy-terminated siloxane polymer and the hydroxylated polysiloxane in this example were the same as in example 2.
The anti-sticking coating for the automobile cylinder gasket is prepared by the following steps:
accurately weighing 8 parts of perfluorooctyl triethoxysilane, 40 parts of alkoxy-terminated siloxane polymer, 32 parts of hydroxylated polysiloxane and 3 parts of brightening agent ethyl cellulose, heating to 77 ℃, dropwise adding 10 parts of 0.5% hydrochloric acid solution, preserving heat after dropwise adding, performing reflux reaction for 1.5 hours, adding 0.5 part of hexamethyldisilazane, adjusting the pH value to 7.0, heating to above 100 ℃, vacuumizing, removing low-boiling-point substances, then adding 70 parts of diluent methanol, cooling to 50 ℃, and adding 6 parts of KH-560 silane coupling agent to obtain the final product.
Example 6
The alkoxy-terminated siloxane polymer and the hydroxylated polysiloxane in this example were the same as in example 3.
The anti-sticking coating for the automobile cylinder gasket is prepared by the following steps:
accurately weighing 20 parts of perfluorodecyl trimethoxy silane, 20 parts of alkoxy-terminated siloxane polymer, 38 parts of hydroxylated polysiloxane and 2 parts of brightening agent methyl cellulose, heating to 76 ℃, dropwise adding 8 parts of 0.5% hydrochloric acid solution, preserving heat after dropwise adding, performing reflux reaction for 2 hours, adding 0.4 part of hexamethyldisilazane, adjusting the pH value to 7.0, heating to above 100 ℃, vacuumizing, removing low-boiling-point substances, then adding 10 parts of diluent isopropanol, cooling to 45 ℃, and adding 4 parts of KH-560 silane coupling agent to obtain the final product.
Comparative example 1
This comparative example differs from example 1 in that: the vehicle cylinder liner release coating does not contain alkoxy-terminated siloxane polymers, and other components and amounts are the same.
Comparative example 2
This comparative example differs from example 1 in that the vehicle cylinder liner release coating does not contain a hydroxylated polysiloxane and the other components and amounts are the same.
Comparative performance tests were as follows:
viscosity: testing was carried out according to the method specified in GB/T265
And (3) testing the anti-sticking performance: the test was carried out according to ASTM standards as follows:
preparing a sample: taking 20g of anti-sticking paint, adding 5g of absolute ethyl alcohol, stirring uniformly, using an 80um wire rod film coating device to uniformly coat the asbestos material, standing at room temperature, drying the coated film surface, and baking at 120 ℃ for 20min for curing;
placing the sample wafer between two flanges, clamping with 30Mpa pressure, and testing according to the following conditions:
a. keeping the temperature at 250 ℃ for 5 hours;
b. keeping the temperature at 150 ℃ for 5 hours;
c. boiling in 30# engine oil for 5 hours at 150 ℃;
d. cooking in 50% ethylene glycol aqueous solution at 100 deg.C for 5 hr.
After the detachment, the presence of the adhesive on the flange surface and the detachment force were observed.
And (3) testing compression resilience: the test was carried out according to the standard of the national Reynolds company.
The test results are shown in table 1.
TABLE 1 test results of examples 1-6 and comparative examples 1-2
The results in Table 1 show that the cylinder liner release coating prepared by the invention has better release isolation performance, less release force and good compression resilience compared with the comparative example.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The anti-sticking coating for the automobile cylinder gasket is characterized by comprising the following components in parts by weight:
2. the vehicle cylinder liner release coating of claim 1, wherein the fluorochemical silane is one or more of 3,3, 3-trifluoropropylmethyldimethoxysilane, perfluorooctyltriethoxysilane, and perfluorodecyltrimethoxysilane.
3. The vehicle cylinder liner release coating of claim 1, wherein the alkoxy-terminated siloxane polymer has the following structural formula:
R1O-[SiO(R2)2]a-[SiO3/2R3]b-R3[SiO2]c-OR1
wherein R is1、R2Or R3Each being a carbon atom number C1～C2One of alkyl or alkoxy of (a); a. b and c are integers of 0-50.
4. The release coating for vehicle cylinder liners according to claim 1, wherein the hydroxylated polysiloxane has the following structural formula:
HO-[SiO(R4)2]d-[SiO3/2R5]e-OH
R4、R5each being a carbon atom number C1～C2One of alkyl or alkoxy of (a); d. e is a positive integer greater than or equal to 0.
5. The vehicle cylinder liner release coating of claim 1, wherein the brightening agent is one or more of methyl cellulose, ethyl cellulose, hydroxyethyl cellulose.
6. The vehicle cylinder liner release coating of claim 1, wherein the diluent is one or more of methanol, ethanol, isopropanol.
7. A method for preparing a release coating for a cylinder gasket for a vehicle according to any one of claims 1 to 6, comprising the steps of:
according to the weight parts, fluorine-containing silane, hydroxylated polysiloxane, alkoxy end-capped siloxane polymer and brightening agent are mixed, 0.5-0.8% hydrochloric acid solution is dropwise added at 50-90 ℃, after dropwise addition, heat preservation and reflux reaction are carried out for 0.5-3 hours, hexamethyldisilazane is added, the pH value is adjusted to 6.5-7.5, the mixture is heated to above 100 ℃ and vacuumized, then diluent is added, the temperature is reduced to 50-55 ℃, and then silane coupling agent is added to obtain the anti-sticking coating for the automobile cylinder gasket.
8. The method according to claim 7, wherein the hydroxylated polysiloxane is prepared by: and dripping siloxane monomers into a reaction container containing a mixture of toluene and water at the temperature of 25-35 ℃, continuously stirring after dripping is finished, and then removing acid water and toluene to obtain the hydroxylated polysiloxane.
9. The method of claim 7, wherein the alkoxy-terminated siloxane polymer is prepared by: dropwise adding a mixture of water and alcohol into a reaction container containing a mixture of silane monomers, alcohol and acidic ion exchange resin at 25-45 ℃, continuously stirring after dropwise adding, heating and refluxing, and removing the ion exchange resin and the solvent to obtain the alkoxy-terminated siloxane oligomer.
10. The method according to claim 9, wherein the heating reflux time is 3 to 4 hours.
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| CN202110411376.1A CN113122135A (en) | 2021-04-16 | 2021-04-16 | Anti-sticking coating for automobile cylinder gasket and preparation method thereof |
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| CN202110411376.1A Pending CN113122135A (en) | 2021-04-16 | 2021-04-16 | Anti-sticking coating for automobile cylinder gasket and preparation method thereof |
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Application publication date: 20210716 |