CN104805681B - A kind of preparation method of flexible heat insulation felt face coat - Google Patents
A kind of preparation method of flexible heat insulation felt face coat Download PDFInfo
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- CN104805681B CN104805681B CN201510194037.7A CN201510194037A CN104805681B CN 104805681 B CN104805681 B CN 104805681B CN 201510194037 A CN201510194037 A CN 201510194037A CN 104805681 B CN104805681 B CN 104805681B
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Abstract
The preparation method of a kind of flexible heat insulation felt face coat, the present invention relates to heat insulation felt face coat, belongs to high-temperature hot guard technology field.The invention solves the problems that flexible heat insulation felt face coat Light deformation ability and the low technical problem of emissivity coefficient.Method: one, prepare alumina sol；Two, pretreatment quartz chopped strand；Three, slip is prepared；Four, spraying, is dried.The present invention is by optimizing coating formula and controlling coating drying system, use air spraying coating process to apply one layer of composite coating with certain Light deformation coordination ability on flexible heat insulation felt surface, improve flexible heat insulation felt durability under harsh environment and thermal radiation capability.The present invention is used for preparing flexible heat insulation felt surface height radiation coating.
Description
Technical field
The present invention relates to flexible heat insulation felt face coat, belong to high-temperature hot guard technology field.
Background technology
Along with improving constantly of Hypersonic Spacecraft flight speed, during rising and reentering, to suffer the highest gas velocity
Degree and Aerodynamic Heating, therefore the Service Environment of spacecraft is more and more severe, and its surface heat protection question becomes restriction aircraft development
One of bottleneck.Reusable flexible heat insulation felt is a kind of cotton-wadded quilt formula structure, fine by silicon dioxide and 99.7% amorphous glass
Dimension composition, its resistance to gentle intensity is superior to ceramic insulation tile.Similar with rigid ceramic thermal insulation tile face coat, flexible heat insulation felt
Surface coating need to have the character such as high temperature resistant, antioxidation, low catalysis, also requires to have certain Light deformation ability and preferably
Seriality.U.S.'s Islington Johnson's space center is at flexible SiO2Three kinds of coatings are developed on heat insulation felt.The first is utilization etc.
Plasma-spray technique first sprays unformed quartz coating on heat insulation felt, sprays the NiCr of a floor height emissivity the most again2O4
Layer；The second coating is at unformed SiO2Powder adds the NiCr of 2-10%2O4；The third is with tetraethyl orthosilicate as silicon
Source, utilizes chemical gaseous phase depositing process to deposit the unformed SiO of a thin layer on heat insulation felt surface2Coating.U.S. NASA Ames
High radiant heat protective coating is prepared on advanced flexible reusable heat insulation felt surface in research center, adds a definite proportion in silica gel
SiC and SiB of example6, then by the method brushed or spray, silica gel solution is coated in the advanced flexible heat insulation felt of Nextel 440
On surface.The most flexible heat insulation felt surface emissivity coating is primarily present two problems: one, easily occur crackle in dry run,
Lack certain Light deformation ability and preferable seriality；Two, under room temperature, coating radiance is higher, but along with using temperature
Raising, radiance is on a declining curve.
Summary of the invention
The invention solves the problems that flexible heat insulation felt face coat Light deformation ability and the low technical problem of emissivity coefficient, and provide
A kind of preparation method of flexible heat insulation felt face coat.
The preparation method of a kind of flexible heat insulation felt face coat, it is characterised in that the method specifically follows the steps below
:
One, it is that 7:3:1 mixes by aluminium secondary butylate, isopropanol and ethyl acetoacetate according to mol ratio, obtains solution 1；
Regulation dilute nitric acid solution pH is 2～3, obtains solution 2；It is that 95:5 mixes by solution 1 and solution 2 according to mass ratio,
Then being 80 DEG C of stirred in water bath 10～12h in temperature, placing into temperature is in 60 DEG C of water-baths aging 10～12h, prepares oxygen
Change Alumina gel；
Two, controlling bath temperature is 50 DEG C, is immersed in acetone soln by quartz chopped strand, keeps 5～8h, then uses pH
Value be 3～4 dilute hydrochloric acid solution and deionized water the most repeatedly rinse, then under the conditions of temperature is 80～100 DEG C vacuum do
Dry 10～12h, obtain pretreated quartz chopped strand；
Three, alumina sol and ethoxy that pretreated quartz chopped strand, the step one step 2 obtained obtains are fine
Dimension element mixing, uses agitator stirring 30～40min, obtains slip 1；According to mass fraction, in slip 1 after pretreatment
Quartzy chopped strand be 35～40 parts, alumina sol be 55～62.5 parts, hydroxyethyl cellulose be 0.5～2.5 part；
Alumina sol that pretreated for step 2 quartz chopped strand, step one are prepared, SiB4Powder, ZrB2Powder
Mix with hydroxyethyl cellulose, use agitator stirring 30～40min, obtain slip 2；According to mass fraction, slip 2
In pretreated quartz chopped strand be 25～30 parts, alumina sol be 40～50 parts, SiB4Powder is 10～15 parts,
ZrB2Powder is 5～10 parts, hydroxyethyl cellulose is 0.5～2.5 part；
Four, flexibility heat insulation felt surface is carried out pre-treatment；Use slip 1 even application that step 3 is obtained by air spray finishing
On heat insulation felt surface, spray 3～5 times, be then dried for the first time；Spray slip 2 again, spray at least three times, then second
Secondary dry, it is thus achieved that flexible heat insulation felt face coat.
The high radiant rate face coat of the present invention with a kind of organic alkoxide aluminium secondary butylate (3 (C4H9O) .Al) as presoma,
Use dilute nitric acid solution as catalyst, prepare alumina sol.The diameter quartz less than 2mm is mixed short in colloidal sol
Cut fiber, then carry out high-speed stirred and be uniformly dispersed with guarantee, and in colloidal sol, mix height radiation filler SiB4Powder and ZrB2
Powder.Finally use air spraying coating process the alumina sol of doping quartz chopped strand and high radiation filler be coated in flexible every
Coating is formed on hot felt surface.Material used specifically includes that aluminium secondary butylate (3 (C4H9O) .Al), isopropanol (C3H8O),
Nitric acid (HNO3), chelating agen ethyl acetoacetate (C6H10O3), it is chemical analysis pure；Dispersant is hydroxy ethyl fiber
Element (HEC), viscosity 30000Pa S；Adulterant is quartz chopped strand, and average diameter is 3 μm, and length is less than 2mm,
SiO2Content is more than 99.95%.High radiation filler SiB4Powder and ZrB2Powder, its particle diameter be respectively 10～50 μm and 20～
50 μm, purity reaches 99wt%.
The invention has the beneficial effects as follows:
1, the coating structure using the present invention to prepare has the microscopic feature of porous, and the Light deformation under thermal gradient effect is coordinated
Ability.
2, dry run uses two step seasonings, is difficult to crackle occur, it is ensured that the seriality of coating structure.
3, coating has the thermal coefficient of expansion close with substrate, and the high radiation agent in coating plays the effect of height radiation, preparation
The radiation coefficient of state coating is not less than 0.85.
4, by proportioning and the optimizing drying system of two kinds of slips of regulation, it is possible to obtain the optimum coating with Matrix Match.
The present invention, by optimizing coating formula and controlling coating drying system, uses air spraying coating process on flexible heat insulation felt surface
Apply one layer of composite coating with certain Light deformation coordination ability, improve flexible heat insulation felt durability under harsh environment and
Thermal radiation capability.This coating has the thermal coefficient of expansion close with base material and possesses good slin emissivity, it is possible to full
The working condition that foot hypersonic aircraft is harsh when reentering, possesses to the aerothermal ability of external radiation.
The present invention is used for preparing flexible heat insulation felt surface height radiation coating.
Accompanying drawing explanation
Fig. 1 is the flexible heat insulation felt face coat surface electronic scanned picture of embodiment two preparation；
Fig. 2 is the flexible heat insulation felt face coat cross section electron scanning picture of embodiment two preparation.
Detailed description of the invention
Technical solution of the present invention is not limited to the detailed description of the invention of act set forth below, also includes between each detailed description of the invention
Combination in any.
Detailed description of the invention one: the preparation method of a kind of flexible heat insulation felt face coat of present embodiment, specifically according to following
Step is carried out:
One, it is that 7:3:1 mixes by aluminium secondary butylate, isopropanol and ethyl acetoacetate according to mol ratio, obtains solution 1；
Regulation dilute nitric acid solution pH is 2～3, obtains solution 2；It is that 95:5 mixes by solution 1 and solution 2 according to mass ratio,
Then being 80 DEG C of stirred in water bath 10～12h in temperature, placing into temperature is in 60 DEG C of water-baths aging 10～12h, prepares oxygen
Change Alumina gel；
Two, controlling bath temperature is 50 DEG C, is immersed in acetone soln by quartz chopped strand, keeps 5～8h, then uses pH
Value be 3～4 dilute hydrochloric acid solution and deionized water the most repeatedly rinse, then under the conditions of temperature is 80～100 DEG C vacuum do
Dry 10～12h, obtain pretreated quartz chopped strand；
Three, alumina sol and ethoxy that pretreated quartz chopped strand, the step one step 2 obtained obtains are fine
Dimension element mixing, uses agitator stirring 30～40min, obtains slip 1；According to mass fraction, in slip 1 after pretreatment
Quartzy chopped strand be 35～40 parts, alumina sol be 55～62.5 parts, hydroxyethyl cellulose be 0.5～2.5 part；
Alumina sol that pretreated for step 2 quartz chopped strand, step one are prepared, SiB4Powder, ZrB2Powder
Mix with hydroxyethyl cellulose, use agitator stirring 30～40min, obtain slip 2；According to mass fraction, slip 2
In pretreated quartz chopped strand be 25～30 parts, alumina sol be 40～50 parts, SiB4Powder is 10～15 parts,
ZrB2Powder is 5～10 parts, hydroxyethyl cellulose is 0.5～2.5 part；
Four, flexibility heat insulation felt surface is carried out pre-treatment；Use slip 1 even application that step 3 is obtained by air spray finishing
On heat insulation felt surface, spray 3～5 times, be then dried for the first time；Spray slip 2 again, spray at least three times, then second
Secondary dry, it is thus achieved that flexible heat insulation felt face coat.
Detailed description of the invention two: present embodiment is unlike detailed description of the invention one: in step 2, quartz chopped strand is put down
The most a diameter of 3 μm, length is less than 2mm, SiO2Mass content is more than 99.95%.Other is identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment is unlike detailed description of the invention one or two: SiB4The particle diameter of powder be 10～
50 μm, quality purity reaches 99%；ZrB2The particle diameter of powder is 20～50 μm, and quality purity reaches 99%.Other is real with concrete
Execute mode one or two identical.
Detailed description of the invention four: present embodiment is unlike one of detailed description of the invention one to three: stir described in step 3
Device is strong mixer.Other is identical with one of detailed description of the invention one to three.
Detailed description of the invention five: present embodiment is unlike one of detailed description of the invention one to four: slip described in step 3
According to mass fraction in 1: pretreated quartz chopped strand is 40 parts, alumina sol is 57.5 parts, ethoxy is fine
Dimension element is 2.5 parts；According to mass fraction in slip 2: pretreated quartz chopped strand is 30 parts, alumina sol
It is 42.5 parts, SiB4Powder is 15 parts, ZrB2Powder is 10 parts, hydroxyethyl cellulose is 2.5 parts.Other be embodied as
One of mode one to four is identical.
Detailed description of the invention six: present embodiment is unlike one of detailed description of the invention one to four: slip 1 described in rapid three
According to mass fraction: pretreated quartz chopped strand is 37.5 parts, alumina sol is 61 parts, hydroxy ethyl fiber
Element is 1.5 parts；According to mass fraction in slip 2: pretreated quartz chopped strand is 26 parts, alumina sol is
50 parts, SiB4Powder is 15 parts, ZrB2Powder is 7.5 parts, hydroxyethyl cellulose is 1.5 parts.Other and detailed description of the invention
One of one to four identical.
Detailed description of the invention seven: present embodiment is unlike one of detailed description of the invention one to four: slip described in step 3
According to mass fraction in 1: pretreated quartz chopped strand is 40 parts, alumina sol is 58.5 parts, ethoxy is fine
Dimension element is 1.5 parts；According to mass fraction in slip 2: pretreated quartz chopped strand is 30 parts, alumina sol
It is 43.5 parts, SiB4Powder is 15 parts, ZrB2Powder is 10 parts, hydroxyethyl cellulose is 1.5 parts.Other be embodied as
One of mode one to four is identical.
Detailed description of the invention eight: present embodiment is unlike one of detailed description of the invention one to seven: empty described in step 4
The technological parameter of gas blowout coating is: air pressure 0.2～0.4MPa, and nozzle is perpendicular to be sprayed-on surface, gun slot distance spray
It is coated with surface 5～10 centimetres.Other is identical with one of detailed description of the invention one to seven.
Detailed description of the invention nine: present embodiment is unlike one of detailed description of the invention one to eight: in step 4 for the first time
Dried is carried out in climatic chamber, and baking temperature is 70～80 DEG C, humidity 40%～50%, drying time be 12～
24h.Other is identical with one of detailed description of the invention one to eight.
Detailed description of the invention ten: present embodiment is unlike one of detailed description of the invention one to nine: in step 4 second
Secondary being dried in atmospheric environment is carried out, drying time 4～8 days.Other is identical with one of detailed description of the invention one to nine.
Employing following example checking beneficial effects of the present invention:
Embodiment one:
The preparation method of a kind of flexible heat insulation felt face coat of the present embodiment, specifically follows the steps below:
One, it is that 7:3:1 mixes by aluminium secondary butylate, isopropanol and ethyl acetoacetate according to mol ratio, obtains solution 1；
Regulation dilute nitric acid solution pH is 2, obtains solution 2；It is that 95:5 mixes by solution 1 and solution 2 according to mass ratio,
Then being 80 DEG C of stirred in water bath 10h in temperature, placing into temperature is aging 12h in 60 DEG C of water-baths, prepares alumina sol；
Two, controlling bath temperature is 50 DEG C, is immersed in acetone soln by quartz chopped strand, keeps 6h, then uses pH value
Be 3 dilute hydrochloric acid solution and deionized water the most repeatedly rinse 50 times, be then vacuum dried under the conditions of temperature is 80 DEG C
12h, obtains pretreated quartz chopped strand；
Three, alumina sol and ethoxy that pretreated quartz chopped strand, the step one step 2 obtained obtains are fine
Dimension element mixing, uses strong mixer stirring 30min, obtains slip 1；According to mass fraction, in slip 1 after pretreatment
Quartzy chopped strand be 35 parts, alumina sol be 62.5 parts, hydroxyethyl cellulose be 2.5 parts；
Alumina sol that pretreated for step 2 quartz chopped strand, step one are prepared, SiB4Powder, ZrB2Powder
Mix with hydroxyethyl cellulose, use strong mixer stirring 30min, obtain slip 2；According to mass fraction, slip 2
In pretreated quartz chopped strand be 25 parts, alumina sol be 50 parts, SiB4Powder is 15 parts, ZrB2Powder is 7.5
Part, hydroxyethyl cellulose are 2.5 parts；
Four, flexibility heat insulation felt surface is carried out pre-treatment；Use slip 1 even application that step 3 is obtained by air spray finishing
On heat insulation felt surface, spray 3 times, be then dried for the first time；Spraying slip 2 again, spray 3 times, then second time is dried,
Obtain flexible heat insulation felt face coat；The technological parameter of described air spray finishing is: air pressure 0.2MPa, and nozzle is vertical
In being sprayed-on surface, gun slot distance sprayed surface 5 centimetres；Dried is carried out in climatic chamber for the first time, is dried
Temperature is 70 DEG C, humidity 40%, and drying time is 18h；Second time is dried in atmospheric environment and carries out, drying time 5
My god.
Embodiment two:
The preparation method of a kind of flexible heat insulation felt face coat of the present embodiment, specifically follows the steps below:
One, it is that 7:3:1 mixes by aluminium secondary butylate, isopropanol and ethyl acetoacetate according to mol ratio, obtains solution 1；
Regulation dilute nitric acid solution pH is 2, obtains solution 2；It is that 95:5 mixes by solution 1 and solution 2 according to mass ratio,
Then being 80 DEG C of stirred in water bath 12h in temperature, placing into temperature is aging 10h in 60 DEG C of water-baths, prepares alumina sol；
Two, controlling bath temperature is 50 DEG C, is immersed in acetone soln by quartz chopped strand, keeps 6h, then uses pH value
Be 2 dilute hydrochloric acid solution and deionized water the most repeatedly rinse 50 times, be then vacuum dried under the conditions of temperature is 80 DEG C
10h, obtains pretreated quartz chopped strand；
Three, alumina sol and ethoxy that pretreated quartz chopped strand, the step one step 2 obtained obtains are fine
Dimension element mixing, uses strong mixer stirring 35min, obtains slip 1；According to mass fraction, in slip 1 after pretreatment
Quartzy chopped strand be 40 parts, alumina sol be 57.5 parts, hydroxyethyl cellulose be 2.5 parts；
Alumina sol that pretreated for step 2 quartz chopped strand, step one are prepared, SiB4Powder, ZrB2Powder
Mix with hydroxyethyl cellulose, use strong mixer stirring 30min, obtain slip 2；According to mass fraction, slip 2
In pretreated quartz chopped strand be 30 parts, alumina sol be 42.5 parts, SiB4Powder is 15 parts, ZrB2Powder is
10 parts, hydroxyethyl cellulose be 2.5 parts；
Four, flexibility heat insulation felt surface is carried out pre-treatment；Use slip 1 even application that step 3 is obtained by air spray finishing
On heat insulation felt surface, spray 5 times, be then dried for the first time；Spraying slip 2 again, spray 3 times, then second time is dried,
Obtain flexible heat insulation felt face coat；The technological parameter of described air spray finishing is: air pressure 0.2MPa, and nozzle is vertical
In being sprayed-on surface, gun slot distance sprayed surface 5 centimetres；Dried is carried out in climatic chamber for the first time, is dried
Temperature is 80 DEG C, humidity 40%, and drying time is 16h；Second time is dried in atmospheric environment and carries out, drying time 5
My god.
Flexible heat insulation felt face coat surface electronic scanned picture prepared by the present embodiment is as shown in Figure 1；
Flexible heat insulation felt face coat cross section electron scanning picture prepared by the present embodiment is as shown in Figure 2.
Embodiment three:
The preparation method of a kind of flexible heat insulation felt face coat of the present embodiment, specifically follows the steps below:
One, it is that 7:3:1 mixes by aluminium secondary butylate, isopropanol and ethyl acetoacetate according to mol ratio, obtains solution 1；
Regulation dilute nitric acid solution pH is 3, obtains solution 2；It is that 95:5 mixes by solution 1 and solution 2 according to mass ratio,
Then being 80 DEG C of stirred in water bath 12h in temperature, placing into temperature is aging 12h in 60 DEG C of water-baths, prepares alumina sol；
Two, controlling bath temperature is 50 DEG C, is immersed in acetone soln by quartz chopped strand, keeps 6h, then uses pH value
Be 3 dilute hydrochloric acid solution and deionized water the most repeatedly rinse 50 times, be then vacuum dried under the conditions of temperature is 80 DEG C
12h, obtains pretreated quartz chopped strand；
Three, alumina sol and ethoxy that pretreated quartz chopped strand, the step one step 2 obtained obtains are fine
Dimension element mixing, uses strong mixer stirring 30min, obtains slip 1；According to mass fraction, in slip 1 after pretreatment
Quartzy chopped strand be 37.5 parts, alumina sol be 61 parts, hydroxyethyl cellulose be 1.5 parts；
Alumina sol that pretreated for step 2 quartz chopped strand, step one are prepared, SiB4Powder, ZrB2Powder
Mix with hydroxyethyl cellulose, use strong mixer stirring 40min, obtain slip 2；According to mass fraction, slip 2
In pretreated quartz chopped strand be 26 parts, alumina sol be 50 parts, SiB4Powder is 15 parts, ZrB2Powder is 7.5
Part, hydroxyethyl cellulose are 1.5 parts；
Four, flexibility heat insulation felt surface is carried out pre-treatment；Use slip 1 even application that step 3 is obtained by air spray finishing
On heat insulation felt surface, spray 3 times, be then dried for the first time；Spraying slip 2 again, spray 3 times, then second time is dried,
Obtain flexible heat insulation felt face coat；The technological parameter of described air spray finishing is: air pressure 0.2MPa, and nozzle is vertical
In being sprayed-on surface, gun slot distance sprayed surface 5 centimetres；Dried is carried out in climatic chamber for the first time, is dried
Temperature is 80 DEG C, humidity 40%, and drying time is 16h；Second time is dried in atmospheric environment and carries out, drying time 6
My god.
Embodiment four:
The preparation method of a kind of flexible heat insulation felt face coat of the present embodiment, specifically follows the steps below:
One, it is that 7:3:1 mixes by aluminium secondary butylate, isopropanol and ethyl acetoacetate according to mol ratio, obtains solution 1；
Regulation dilute nitric acid solution pH is 2, obtains solution 2；It is that 95:5 mixes by solution 1 and solution 2 according to mass ratio,
Then being 80 DEG C of stirred in water bath 10h in temperature, placing into temperature is aging 12h in 60 DEG C of water-baths, prepares alumina sol；
Two, controlling bath temperature is 50 DEG C, is immersed in acetone soln by quartz chopped strand, keeps 6h, then uses pH value
Be 3 dilute hydrochloric acid solution and deionized water the most repeatedly rinse 50 times, be then vacuum dried under the conditions of temperature is 80 DEG C
12h, obtains pretreated quartz chopped strand；
Three, alumina sol and ethoxy that pretreated quartz chopped strand, the step one step 2 obtained obtains are fine
Dimension element mixing, uses strong mixer stirring 35min, obtains slip 1；According to mass fraction, in slip 1 after pretreatment
Quartzy chopped strand be 40 parts, alumina sol be 58.5 parts, hydroxyethyl cellulose be 1.5 parts；
Alumina sol that pretreated for step 2 quartz chopped strand, step one are prepared, SiB4Powder, ZrB2Powder
Mix with hydroxyethyl cellulose, use strong mixer stirring 40min, obtain slip 2；According to mass fraction, slip 2
In pretreated quartz chopped strand be 30 parts, alumina sol be 43.5 parts, SiB4Powder is 15 parts, ZrB2Powder is
10 parts, hydroxyethyl cellulose be 1.5 parts；
Four, flexibility heat insulation felt surface is carried out pre-treatment；Use slip 1 even application that step 3 is obtained by air spray finishing
On heat insulation felt surface, spray 3 times, be then dried for the first time；Spraying slip 2 again, spray 3 times, then second time is dried,
Obtain flexible heat insulation felt face coat；The technological parameter of described air spray finishing is: air pressure 0.2MPa, and nozzle is vertical
In being sprayed-on surface, gun slot distance sprayed surface 3 centimetres；Dried is carried out in climatic chamber for the first time, is dried
Temperature is 70 DEG C, humidity 50%, and drying time is 24h；Second time is dried in atmospheric environment and carries out, drying time 6
My god.
Claims (10)
1. the preparation method of a flexible heat insulation felt face coat, it is characterised in that the method specifically follows the steps below
:
One, it is that 7:3:1 mixes by aluminium secondary butylate, isopropanol and ethyl acetoacetate according to mol ratio, obtains solution 1；
Regulation dilute nitric acid solution pH is 2～3, obtains solution 2；It is that 95:5 mixes by solution 1 and solution 2 according to mass ratio,
Then being 80 DEG C of stirred in water bath 10～12h in temperature, placing into temperature is in 60 DEG C of water-baths aging 10～12h, prepares oxidation
Alumina gel；
Two, controlling bath temperature is 50 DEG C, is immersed in acetone soln by quartz chopped strand, keeps 5～8h, then uses pH value
Be 3～4 dilute hydrochloric acid solution and deionized water the most repeatedly rinse, then under the conditions of temperature is 80～100 DEG C be vacuum dried
10～12h, obtain pretreated quartz chopped strand；
Three, alumina sol and ethoxy that pretreated quartz chopped strand, the step one step 2 obtained obtains are fine
Dimension element mixing, uses agitator stirring 30～40min, obtains slip 1；According to mass fraction, pretreated in slip 1
Quartz chopped strand is 35～40 parts, alumina sol is 55～62.5 parts, hydroxyethyl cellulose is 0.5～2.5 part；
Alumina sol that pretreated for step 2 quartz chopped strand, step one are prepared, SiB4Powder, ZrB2Powder and
Hydroxyethyl cellulose mixes, and uses agitator stirring 30～40min, obtains slip 2；According to mass fraction, pre-in slip 2
Quartzy chopped strand after process is 25～30 parts, alumina sol is 40～50 parts, SiB4Powder is 10～15 parts, ZrB2Powder
Be 5～10 parts, hydroxyethyl cellulose be 0.5～2.5 part；
Four, flexibility heat insulation felt surface is carried out pre-treatment；Use slip 1 even application that step 3 is obtained by air spray finishing
On heat insulation felt surface, spray 3～5 times, be then dried for the first time；Spray slip 2 again, spray at least three times, then second
Secondary dry, it is thus achieved that flexible heat insulation felt face coat.
The preparation method of a kind of flexible heat insulation felt face coat the most according to claim 1, it is characterised in that in step 2
Quartz chopped strand average diameter is 3 μm, and length is less than 2mm, SiO2Mass content is more than 99.95%.
The preparation method of a kind of flexible heat insulation felt face coat the most according to claim 1, it is characterised in that in step 3
SiB4The particle diameter of powder is 10～50 μm, and quality purity reaches 99%；ZrB2The particle diameter of powder is 20～50 μm, and quality purity reaches
99%.
The preparation method of a kind of flexible heat insulation felt face coat the most according to claim 1, it is characterised in that step 3 institute
Stating agitator is strong mixer.
The preparation method of a kind of flexible heat insulation felt face coat the most according to claim 1, it is characterised in that step 3 institute
State in slip 1 according to mass fraction: pretreated quartz chopped strand is 40 parts, alumina sol is 57.5 parts, hydroxyl
Ethyl cellulose is 2.5 parts；According to mass fraction in slip 2: pretreated quartz chopped strand is 30 parts, aluminium oxide
Colloidal sol is 42.5 parts, SiB4Powder is 15 parts, ZrB2Powder is 10 parts, hydroxyethyl cellulose is 2.5 parts.
The preparation method of a kind of flexible heat insulation felt face coat the most according to claim 1, it is characterised in that step 3 institute
State in slip 1 according to mass fraction: pretreated quartz chopped strand is 37.5 parts, alumina sol is 61 parts, hydroxyl
Ethyl cellulose is 1.5 parts；According to mass fraction in slip 2: pretreated quartz chopped strand is 26 parts, aluminium oxide
Colloidal sol is 50 parts, SiB4Powder is 15 parts, ZrB2Powder is 7.5 parts, hydroxyethyl cellulose is 1.5 parts.
The preparation method of a kind of flexible heat insulation felt face coat the most according to claim 1, it is characterised in that step 3 institute
State in slip 1 according to mass fraction: pretreated quartz chopped strand is 40 parts, alumina sol is 58.5 parts, hydroxyl
Ethyl cellulose is 1.5 parts；According to mass fraction in slip 2: pretreated quartz chopped strand is 30 parts, aluminium oxide
Colloidal sol is 43.5 parts, SiB4Powder is 15 parts, ZrB2Powder is 10 parts, hydroxyethyl cellulose is 1.5 parts.
The preparation method of a kind of flexible heat insulation felt face coat the most according to claim 1, it is characterised in that in step 4
The technological parameter of described air spray finishing is: air pressure 0.2～0.4MPa, nozzle is perpendicular to be sprayed-on surface, gun slot
Distance sprayed surface 5～10 centimetres.
The preparation method of a kind of flexible heat insulation felt face coat the most according to claim 1, it is characterised in that in step 4
Dried is carried out in climatic chamber for the first time, and baking temperature is 70～80 DEG C, humidity 40%～50%, drying time
It is 12～24h.
The preparation method of a kind of flexible heat insulation felt face coat the most according to claim 1, it is characterised in that step 4
Middle second time is dried in atmospheric environment and carries out, drying time 4～8 days.
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