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CN112126349A - Polysiloxane long-acting lubricating protective coating with space environment resistance - Google Patents

Polysiloxane long-acting lubricating protective coating with space environment resistance Download PDF

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Publication number
CN112126349A
CN112126349A CN202011049955.8A CN202011049955A CN112126349A CN 112126349 A CN112126349 A CN 112126349A CN 202011049955 A CN202011049955 A CN 202011049955A CN 112126349 A CN112126349 A CN 112126349A
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protective coating
long
resistance
coating
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陈磊
赵志成
李红轩
周惠娣
陈建敏
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Lanzhou Institute of Chemical Physics LICP of CAS
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D183/00Coating 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
    • C09D183/04Polysiloxanes
    • C09D183/06Polysiloxanes containing silicon bound to oxygen-containing groups
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04Polysiloxanes
    • C08G77/14Polysiloxanes containing silicon bound to oxygen-containing groups
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
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    • C08K2003/3009Sulfides

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Abstract

The invention relates to a polysiloxane long-acting lubrication protective coating with space environment resistance, which is prepared by stirring and uniformly dispersing 20 parts by weight of epoxy polysiloxane resin, 9-20 parts by weight of disulfide compound slurry and 1.4-6 parts by weight of amino curing agent at the rotating speed of 2800 r/min-3500 r/min to ensure that the solid component content is 35 +/-10%. The lubricating protective coating greatly improves the space environment resistance and the wear resistance of the existing space lubricating coating, has the characteristics of good adhesion to a metal base material, good flexibility, good impact resistance, long wear life, excellent space environment resistance and the like, and can effectively prolong the service life of related equipment in a space environment.

Description

Polysiloxane long-acting lubricating protective coating with space environment resistance
Technical Field
The invention relates to the technical field of lubrication protection, in particular to a polysiloxane long-acting lubrication protective coating with space environment resistance.
Background
Lubricating materials used in equipment in service of a near-earth rail are damaged by special space environment, so that the lubricating failure of the space equipment is caused. Lubrication failure is an important factor leading to short service life and low reliability of space equipment, and research of NASA (national service administration), ESA (European application information Association) and Russian aerospace shows that the failure of a considerable proportion (more than 30%) of space mechanical parts is closely related to lubrication failure. Due to the action of high vacuum, radiation, atomic oxygen and other space environments of the near-earth orbit, the lubricating grease creeps and volatilizes, is easy to decompose or crosslink and deteriorate, and has poor applicability to the space environment. The bonded solid lubricating coating forms a film on the surface of space equipment, has low evaporation rate, simple operation, controllable thickness and excellent wear resistance and antifriction performance, and is widely applied in the field of aerospace industry.
The currently used coatings include organic and inorganic lubricating protective coatings. The organic coating has poor space environment resistance, and particularly, atomic oxygen in a near-earth orbit environment severely erodes the organic coating. Inorganic coatings have a large gap in adhesion, impact resistance, and lubricity compared to organic coatings. Chinese patent CN2018115974781 (a long-acting solid lubrication protective coating with excellent space environment resistance) adopts POSS modified organic binder to improve the space environment adaptability of organic coating, but the POSS modified organic coating is formed by oxidizing exposed POSS after the surface layer polyamideimide is corroded2The protective layer provides anti-erosion capability, and the initial mass loss of atomic oxygen irradiation is large. In addition, in chinese patent CN201910305225.0 (an organic-inorganic composite lubricating protective coating material with excellent resistance to space environment), polytetrafluoroethylene modified polyphosphate is used as a coating binder to improve the flexibility and lubricating property of the inorganic coating, but the polytetrafluoroethylene used in the modified polyphosphate decomposes into small molecules in the space environment, is easy to lubricate and lose efficacy, and reduces the reliability of the application of the inorganic coating in the space environment.
Disclosure of Invention
The invention aims to solve the technical problem of providing a polysiloxane long-acting lubricating protective coating with good performance and space environment resistance.
In order to solve the problems, the invention provides a polysiloxane long-acting lubricating protective coating with space environment resistance, which is characterized in that: the coating is prepared by stirring and uniformly dispersing 20 parts of epoxy polysiloxane resin, 9-20 parts of disulfide compound slurry and 1.4-6 parts of amino curing agent by weight at a rotating speed of 2800 r/min-3500 r/min to ensure that the solid component content is 35 +/-10%.
The structural characteristics of the epoxy polysiloxane resin are as follows: R/Si is 1.2-1.5; the epoxy value is 0.4-0.6; the content of phenyl is 20-45%.
The epoxy polysiloxane resin is prepared by the following method:
the method comprises the following steps of weighing the following raw materials in percentage by weight: 20-40% of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 10-40% of diphenyl dimethoxy silane, 1.5-5.3% of diluted phosphoric acid with the mass concentration of 1%, and the balance of diluent;
mixing the diphenyldimethoxysilane with the diluent, heating to 65 +/-5 ℃ under the condition of oil bath, adding the dilute phosphoric acid, and stirring and hydrolyzing at 65 +/-5 ℃ for 2-4 h to obtain a hydrolysate;
thirdly, adding the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane into the hydrolysate, stirring and hydrolyzing at 65 +/-5 ℃ for 2-4 h, and cooling to room temperature to obtain the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane hydrolysate.
The disulfide compound slurry is prepared by uniformly mixing molybdenum disulfide or tungsten disulfide with purity of more than or equal to 97% and size of 3-7 mu m and a diluent according to the mass ratio of 1: 1.
The amino curing agent is 4,4' -diaminodiphenyl sulfone or 3,3' -dichloro-4, 4' -diaminodiphenyl methane with the purity of more than or equal to 98 percent.
The diluent is a solution formed by uniformly mixing toluene with purity more than or equal to 98% and absolute ethyl alcohol in a mass ratio.
The application of the polysiloxane long-acting lubrication protective coating with the space environment resistance is characterized in that: spraying the lubricating protective coating on the surface of the treated part under the condition of oil-free compressed air; then standing at room temperature for 1-3 h, surface drying, curing at 100 +/-5 ℃ for 1 h, and finally curing at 200 +/-5 ℃ for 1 h.
Compared with the prior art, the invention has the following advantages:
1. the present invention employs an epoxy polysiloxane resin as a binder. Because the main chain of the polysiloxane resin is of a Si-O-Si structure, compared with C-C, C-H in a carbon chain polymer, the polysiloxane resin has excellent stability and excellent space environment adaptability, but the polysiloxane coating has the problems of low adhesion with a metal substrate and poor flexibility. Therefore, the epoxy polysiloxane lubricating protective coating is prepared by designing the molecular structure of polysiloxane, the defects of low adhesion and poor flexibility of the polysiloxane coating are effectively overcome, and the preparation of the polysiloxane long-acting lubricating protective coating with excellent space environment resistance is realized.
2. The coatings obtained according to the invention were sprayed on the surface of the parts and tested for properties, as shown in table 1. The obtained coating is smooth and has no crack, the adhesive force is 0 grade, the flexibility is 1 mm, and the impact resistance is 50 cm; through a friction and wear test, the friction coefficient is 0.03-0.04; the wear-resisting service life is more than or equal to 650000 r; warp 1021atom/cm2After atomic oxygen irradiation, the change of the coating quality in the irradiation process is very small (see figure 1), and compared with the organic-inorganic composite lubricating protective coating, the quality loss is reduced by 50 percent (CN 201910305225.0), and compared with the POSS modified imine lubricating protective coating, the quality loss is reduced by 95 percent (CN 2018115974781). Meanwhile, the morphology of the coating does not change greatly before and after irradiation (see fig. 2), and the types of elements of the coating do not change before and after irradiation (see fig. 4 (a)); after the coating is irradiated by atomic oxygen, the chemical state of Si in the surface polysiloxane resin is changed to generate SiO2The barrier layer, organized the attack of atomic oxygen on the underlying coating (see fig. 4 (b)), indicates that the coatings prepared according to the present invention have excellent resistance to atomic oxygen attack. In addition, atomic oxygen irradiation has little effect on the vacuum friction properties of the coatings produced by the present invention (see FIG. 3).
TABLE 1 Main Performance index of the products of the examples
Figure 188656DEST_PATH_IMAGE001
Note: testing of Friction PropertiesThe method comprises the following steps: the CSM vacuum bolt disk friction wear testing machine comprises an upper sampleΦA GCr15 steel ball with the thickness of 6 mm, a lower sample of composite coating with the thickness of (25 +/-5) mu m, a 1045# stainless steel base and a friction mode of point contact rotational friction. Vacuum degree: 10-6~10-5Mbar, load: 5N, radius of rotation: 5 mm, frequency 1000 r/min.
Spatial environment adaptability: putting the coating into a vacuum chamber, and performing atomic oxygen irradiation with total irradiation dose of 1.3 × 1021atom/cm2
Therefore, the lubricating protective coating greatly improves the space environment resistance and wear resistance of the existing space lubricating coating, has the characteristics of good adhesion to a metal base material, good flexibility, impact resistance, long wear life, excellent space environment resistance and the like, and can effectively prolong the service life of related equipment in a space environment.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a graph showing the change in mass of a coating produced according to the present invention during atomic oxygen irradiation.
FIG. 2 is an electron micrograph of the morphology of the coating prepared according to the present invention before (a) and after (b) atomic oxygen irradiation. FIG. 3 is a graph of the vacuum coefficient of friction of the coating prepared by the present invention before and after atomic oxygen irradiation.
FIG. 4 shows XPS survey spectra (a) and fine Si spectra (b) of the surface of a coating prepared according to the present invention before and after atomic oxygen irradiation.
Detailed Description
Example 1A silicone long-lasting lubricating protective coating with dimensional environment resistance is prepared from 20g of epoxy silicone resin, 18g of molybdenum disulfide slurry ground by a conical mill, and 2g of 4,4' -diamino diphenyl sulfone by stirring and uniformly dispersing at 2800r/min until the solid component content is 35 +/-10%.
Wherein: the epoxy polysiloxane resin is prepared by the following method:
the method comprises the following steps of weighing the following raw materials in percentage by weight: 12g of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 6g of diphenyl dimethoxy silane, 0.9g of diluted phosphoric acid with the mass concentration of 1%, 20.55g of absolute ethyl alcohol and 20.55g of toluene;
mixing diphenyldimethoxysilane and a diluent, heating to 65 +/-5 ℃ under the condition of oil bath, adding dilute phosphoric acid, and stirring and hydrolyzing at 65 +/-5 ℃ for 3 hours to obtain hydrolysate;
and adding gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane into the hydrolysate, stirring and hydrolyzing at 65 +/-5 ℃ for 3h, and cooling to room temperature to obtain the product.
Example 2 a silicone long-acting lubrication protective coating with dimensional environment resistance is prepared from 20g of epoxy polysiloxane resin, 20g of molybdenum disulfide slurry ground by a conical mill, and 6g of 4,4' -diamino diphenyl sulfone by stirring and dispersing uniformly at 3500r/min so that the solid component content is 35 +/-10%.
Wherein: the epoxy polysiloxane resin is prepared by the following method:
the method comprises the following steps of weighing the following raw materials in percentage by weight: 8g of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 8g of diphenyl dimethoxy silane, 0.3g of diluted phosphoric acid with the mass concentration of 1%, 1.85g of absolute ethyl alcohol and 1.85g of toluene;
mixing diphenyldimethoxysilane and a diluent, heating to 65 +/-5 ℃ under the condition of oil bath, adding dilute phosphoric acid, and stirring and hydrolyzing at 65 +/-5 ℃ for 3 hours to obtain hydrolysate;
and adding gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane into the hydrolysate, stirring and hydrolyzing at 65 +/-5 ℃ for 3h, and cooling to room temperature to obtain the product.
Example 3 a silicone long-acting lubrication protective coating with dimensional environment resistance is prepared from 20g of epoxy polysiloxane resin, 10g of molybdenum disulfide slurry ground by a conical mill, and 6g of 4,4' -diamino diphenyl sulfone by stirring and dispersing uniformly at a rotating speed of 3000r/min to make the solid component content 35 +/-10%.
Wherein: the epoxy polysiloxane resin is prepared by the following method:
the method comprises the following steps of weighing the following raw materials in percentage by weight: 12g of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 11g of diphenyl dimethoxy silane, 2.3g of diluted phosphoric acid with the mass concentration of 1%, 9g of absolute ethyl alcohol and 9g of toluene;
mixing diphenyldimethoxysilane and a diluent, heating to 65 +/-5 ℃ under the condition of oil bath, adding dilute phosphoric acid, and stirring and hydrolyzing at 65 +/-5 ℃ for 3 hours to obtain hydrolysate;
and adding gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane into the hydrolysate, stirring and hydrolyzing at 65 +/-5 ℃ for 3h, and cooling to room temperature to obtain the product.
Example 4 a silicone long-lasting lubricating protective coating with dimensional environmental resistance is prepared from 20g of epoxy silicone resin, 10g of molybdenum disulfide slurry ground by a conical mill, and 1.4g of 4,4' -diamino diphenyl sulfone by stirring and dispersing uniformly at 2800r/min to make the solid content 35 +/-10%.
Wherein: the epoxy polysiloxane resin is prepared by the following method:
the method comprises the following steps of weighing the following raw materials in percentage by weight: 8g of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 11g of diphenyl dimethoxy silane, 1.9g of diluted phosphoric acid with the mass concentration of 1%, 9g of absolute ethyl alcohol and 9g of toluene;
mixing diphenyldimethoxysilane and a diluent, heating to 65 +/-5 ℃ under the condition of oil bath, adding dilute phosphoric acid, and stirring and hydrolyzing at 65 +/-5 ℃ for 2 hours to obtain hydrolysate;
and adding gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane into the hydrolysate, stirring and hydrolyzing at 65 +/-5 ℃ for 2h, and cooling to room temperature to obtain the product.
Example 5A silicone long-acting lubrication protective coating with space environment resistance is prepared by uniformly stirring and dispersing 20g of epoxy silicone resin, 12g of molybdenum disulfide slurry ground by a conical mill and 1.4g of 4,4' -diamino diphenyl sulfone at the rotating speed of 3200r/min to ensure that the solid component content is 35 +/-10%.
Wherein: the epoxy polysiloxane resin is prepared by the following method:
the method comprises the following steps of weighing the following raw materials in percentage by weight: 9g of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 13g of diphenyl dimethoxy silane, 1.9g of diluted phosphoric acid with the mass concentration of 1%, 9g of absolute ethyl alcohol and 9g of toluene;
mixing diphenyldimethoxysilane and a diluent, heating to 65 +/-5 ℃ under the condition of oil bath, adding dilute phosphoric acid, and stirring and hydrolyzing at 65 +/-5 ℃ for 4 hours to obtain hydrolysate;
and adding gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane into the hydrolysate, stirring and hydrolyzing at 65 +/-5 ℃ for 4h, and cooling to room temperature to obtain the product.
Example 6A long-acting silicone lubricating protective coating with environmental resistance is prepared from epoxy polysiloxane resin 20g, molybdenum disulfide slurry 12g milled by a conical mill, and 4,4' -diamino diphenyl sulfone 5g by stirring and dispersing uniformly at 3500r/min until the solid content is 35 +/-10%.
Wherein: the epoxy polysiloxane resin was the same as in example 5.
Example 7A silicone long-lasting lubricating protective coating with dimensional environment resistance is prepared from 20g of epoxy silicone resin, 15g of molybdenum disulfide slurry ground by a conical mill, and 1.8g of 4,4' -diamino diphenyl sulfone by stirring and uniformly dispersing at 2800r/min until the solid component content is 35 +/-10%.
Wherein: the epoxy polysiloxane resin was the same as in example 5.
Example 8A silicone long-lasting lubricating protective coating with dimensional environment resistance is prepared from 20g of epoxy silicone resin, 9g of molybdenum disulfide slurry ground by a conical mill, and 1.4g of 4,4' -diamino diphenyl sulfone by stirring and dispersing uniformly at 2800r/min until the solid content is 35 +/-10%.
Wherein: the epoxy polysiloxane resin was the same as in example 5.
In examples 1 to 8, the structural characteristics of the epoxypolysiloxane resin are as follows: R/Si is 1.2-1.5; the epoxy value is 0.4-0.6; the content of phenyl is 20-45%.
The molybdenum disulfide slurry is prepared by uniformly mixing molybdenum disulfide with purity of more than or equal to 97% and size of 3-7 mu m and a diluent according to the mass ratio of 1: 1. The molybdenum disulphide may also be replaced by tungsten disulphide.
4,4' -diaminodiphenyl sulfone can also be replaced by 3,3' -dichloro-4, 4' -diaminodiphenyl methane, and the purity is more than or equal to 98%.
The diluent is a solution formed by uniformly mixing toluene and absolute ethyl alcohol in a mass ratio.
The purity of the toluene or the absolute ethyl alcohol is more than or equal to 98 percent.
The polysiloxane long-acting lubricating protective coating with space environment resistance obtained in the above embodiments 1-8 is applied as follows: under the condition of oil-free compressed air, the lubricating protective coating is sprayed on the surface of a treated part (the surface of the part needs surface treatment such as oil removal, rust removal, sand blasting, ultrasound and the like in advance); then standing at room temperature for 1-3 h, surface drying, curing at 100 +/-5 ℃ for 1 h, and finally curing at 200 +/-5 ℃ for 1 h.

Claims (7)

1. A polysiloxane long-acting lubrication protective coating with space environment resistance is characterized in that: the coating is prepared by stirring and uniformly dispersing 20 parts of epoxy polysiloxane resin, 9-20 parts of disulfide compound slurry and 1.4-6 parts of amino curing agent by weight at a rotating speed of 2800 r/min-3500 r/min to ensure that the solid component content is 35 +/-10%.
2. The long-acting silicone lubricating protective coating with environmental resistance in space as claimed in claim 1, wherein: the structural characteristics of the epoxy polysiloxane resin are as follows: R/Si is 1.2-1.5; the epoxy value is 0.4-0.6; the content of phenyl is 20-45%.
3. A long-acting silicone lubricating protective coating with steric resistance as claimed in claim 1 or 2, wherein: the epoxy polysiloxane resin is prepared by the following method:
the method comprises the following steps of weighing the following raw materials in percentage by weight: 20-40% of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 10-40% of diphenyl dimethoxy silane, 1.5-5.3% of diluted phosphoric acid with the mass concentration of 1%, and the balance of diluent;
mixing the diphenyldimethoxysilane with the diluent, heating to 65 +/-5 ℃ under the condition of oil bath, adding the dilute phosphoric acid, and stirring and hydrolyzing at 65 +/-5 ℃ for 2-4 h to obtain a hydrolysate;
thirdly, adding the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane into the hydrolysate, stirring and hydrolyzing at 65 +/-5 ℃ for 2-4 h, and cooling to room temperature to obtain the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane hydrolysate.
4. The long-acting silicone lubricating protective coating with environmental resistance in space as claimed in claim 1, wherein: the disulfide compound slurry is prepared by uniformly mixing molybdenum disulfide or tungsten disulfide with purity of more than or equal to 97% and size of 3-7 mu m and a diluent according to the mass ratio of 1: 1.
5. The long-acting silicone lubricating protective coating with environmental resistance in space as claimed in claim 1, wherein: the amino curing agent is 4,4' -diaminodiphenyl sulfone or 3,3' -dichloro-4, 4' -diaminodiphenyl methane with the purity of more than or equal to 98 percent.
6. A long-acting silicone lubricating protective coating with environmental resistance in space as claimed in claim 3 or 4, wherein: the diluent is a solution formed by uniformly mixing toluene with purity more than or equal to 98% and absolute ethyl alcohol in a mass ratio.
7. The use of a long-lasting silicone lubricant barrier coating having environmental resistance as defined in claim 1, wherein: spraying the lubricating protective coating on the surface of the treated part under the condition of oil-free compressed air; then standing at room temperature for 1-3 h, surface drying, curing at 100 +/-5 ℃ for 1 h, and finally curing at 200 +/-5 ℃ for 1 h.
CN202011049955.8A 2020-09-29 2020-09-29 Polysiloxane long-acting lubricating protective coating with space environment resistance Pending CN112126349A (en)

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