Preparation method of flame-retardant heat-insulating curtain

Abstract

The invention belongs to the technical field of curtains, and relates to a preparation method of a flame-retardant heat-insulating curtain, which comprises the following steps: step 1, grinding and refining polyethylene glycol terephthalate, then putting the polyethylene glycol terephthalate into gamma-valerolactone, and mixing to form a polyethylene glycol terephthalate solution; the preparation method comprises the following steps: blending expanded vermiculite and ethanol, carrying out wet grinding treatment, adding the mixture into a polyethylene glycol terephthalate solution, uniformly stirring, carrying out solution expansion by diethyl ether, standing, and carrying out constant-temperature decompression to obtain a mixture and a recovery solution; melting and granulating the mixture, spinning to obtain flame-retardant polyester fibers, and weaving to obtain a prefabricated flame-retardant curtain; adding silane into the recovery liquid, uniformly stirring, quickly soaking the prefabricated flame-retardant curtain, taking out the prefabricated flame-retardant curtain, standing, and heating to obtain the flame-retardant heat-insulating curtain. The problem that an existing flame-retardant curtain is unstable in flame-retardant performance is solved, expanded vermiculite is matched with silane to form a composite flame-retardant system with the inner flame-retardant function and the outer protection function, and the long-term effect and stability of the flame-retardant curtain are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of curtains, and particularly relates to a method for preparing a flame-retardant heat-insulating curtain. Background Art

[0002] With rising living standards and improved quality of life, market demand for flame-retardant curtains has grown year by year, and they are widely used in residential, commercial, and public spaces. With the introduction and implementation of the "Code for Fire Protection Design of Interior Decoration of Buildings," the performance requirements for flame-retardant curtains have been specified and become a criterion for market access, further promoting their development.

[0003] Current flame-retardant curtains typically use phosphorus-based and nitrogen-based flame retardants as flame-retardant finishes, which are applied to the fabric surface via a conventional padding process. However, the flame retardants in these padding-finished curtains typically deposit on the surface and do not penetrate the fabric interior. Furthermore, they can fall off during repeated washing, resulting in a decrease in flame retardancy. Summary of the Invention

[0004] In response to the problems in the prior art, the present invention provides a method for preparing flame-retardant thermal insulation curtains, which solves the problem of unstable flame retardant performance of existing flame-retardant curtains. Expanded vermiculite is combined with silane to form a composite flame retardant system with internal flame retardancy and external protection, which effectively improves the long-term effectiveness and stability of the flame-retardant curtains. The silicone material formed by the hydrolysis and polycondensation of silane has good insulation properties, and the low thermal conductivity of expanded vermiculite and polyester produces an excellent thermal insulation effect.

[0005] In order to achieve the above technical objectives, the technical solution of the present invention is:

[0006] A method for preparing a flame-retardant heat-insulating curtain comprises the following steps:

[0007] Step 1: Grind polyethylene terephthalate into fine particles, then mix it in γ-valerolactone to form a polyethylene terephthalate solution, wherein the grinding temperature is 10-20° C., the grinding pressure is 0.3-0.5 MPa, the mass ratio of polyethylene terephthalate to γ-valerolactone is 1:10-12, the mixing temperature is 130-150° C., and the mixing is performed in a sealed manner. In this step, polyethylene terephthalate particles are refined by grinding to form a fine powder of polyethylene terephthalate, which greatly increases its contact area and forms stable swelling and sealed dissolution in γ-valerolactone, thereby obtaining a stable polyethylene terephthalate solution.

[0008] Step 2, after the expanded vermiculite and ethanol are blended, wet grinding is carried out, and then the expanded vermiculite is added to the polyethylene terephthalate solution and stirred evenly, and the mixture and recovered liquid are obtained by constant temperature decompression after being expanded with ether and allowed to stand; the mass ratio of the expanded vermiculite to the ethanol is 3-5:1, the temperature of the wet grinding is 10-20°C, the pressure is 0.3-0.5MPa, the mass ratio between the expanded vermiculite and the polyethylene terephthalate in the polyethylene terephthalate solution is 1:10-14, the temperature of stirring is 20-30°C, the stirring speed is 300-500r / min, the usage amount of the ether is 100-400% of the volume of the polyethylene terephthalate solution, the pressure of the constant temperature decompression is 80-90% of the atmospheric pressure, and the temperature is 80- 90 ℃; This step utilizes the blending mode of expanded vermiculite and ether to form a wet grinding process, refines the expanded vermiculite particles, and forms a blend with the polyethylene terephthalate solution, forms pore penetration on the expanded vermiculite through the fluidity of the polyethylene terephthalate solution, cooperates with ether dissolution to improve the fluidity of the polyethylene terephthalate solution, thereby ensuring that the polyethylene terephthalate is wrapped around the expanded vermiculite, in constant temperature and reduced pressure, ether, ethanol and γ-valerolactone will form a gradient evaporation, and the polyethylene terephthalate solution will ensure that the polyethylene terephthalate will wrap the expanded vermiculite inside and outside as the concentration increases and the fluidity decreases, and forms a closed package for the expanded vermiculite; the recovered liquid obtained by constant temperature and reduced pressure contains ether and γ-valerolactone microbeads and a small amount of ethanol;

[0009] Step 3: melt-granulate the mixture and spin it to obtain flame-retardant polyester fiber, which is then woven to obtain prefabricated flame-retardant curtains. The melt-granulation temperature is 260-270°C, the spinning temperature is 270-280°C, and the weight of the prefabricated flame-retardant curtains is 250-280g / m 2 This step utilizes melt granulation to melt polyethylene terephthalate, thereby improving its fluidity with expanded vermiculite, ensuring that the gaps in the expanded vermiculite are filled, and reducing internal porosity. After melt granulation and melt spinning, polyester fibers containing flame retardant material are obtained, and the flame retardant polyester fibers are used as monofilaments for weaving to obtain prefabricated flame retardant curtains. The flame retardant curtains, based on the internal expanded vermiculite and the properties of the polyester itself, have excellent flame retardancy and light-shielding properties. At the same time, the low thermal conductivity of the polyester and expanded vermiculite provides an excellent heat barrier effect.

[0010] Step 4, adding silane to the recovery liquid and stirring evenly, then quickly soaking the prefabricated flame retardant curtain, taking it out and letting it stand for 20-30 minutes, heating it for 30-50 minutes, and obtaining a flame retardant thermal insulation curtain, wherein the silane is one of methyltrichloroethane, dimethyldichlorosilane, ethyltrichlorosilane, diethyldichlorosilane, and methylethyltrichlorosilane, and the concentration of silane in the recovery liquid is 100-400g / L, the temperature of the quick soaking is 10-20°C, the time is 10-20s, the atmosphere of the standing is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10:1, the temperature is 30-40°C, and the The temperature of the heating treatment is 100-120°C, and the pressure is 80-90% of the atmospheric pressure. In this step, the silane is dissolved by the recovered liquid to form a composite solvent of silane ether and γ-valerolactone. The ether here has good solubility for silane and is the main component of the composite solvent. The γ-valerolactone is soluble in polyester. A liquid film is formed on the surface of the prefabricated flame-retardant curtain by rapid immersion. The liquid film forms surface permeability corrosion on the polyester, increasing the roughness of the polyester surface. This can not only effectively improve the deposition of silane on the polyester surface, but also the silane can fill the rough surface, improve the smoothness of the polyester surface, and eliminate the problem of easy dust contamination on the polyester surface.

[0011] It can be seen from the above description that the present invention has the following advantages:

[0012] 1. The present invention solves the problem of unstable flame retardant performance of existing flame retardant curtains. It uses expanded vermiculite in combination with silane to form a composite flame retardant system with internal flame retardancy and external protection, effectively improving the long-term effectiveness and stability of flame retardant curtains. The silicone material formed by the hydrolysis and polycondensation of silane has good insulation properties, and the low thermal conductivity of expanded vermiculite and polyester produces an excellent thermal insulation effect.

[0013] 2. The present invention utilizes the solubility of γ-valerolactone in polyester to form a solvent with excellent fluidity, which penetrates and deposits on expanded vermiculite, thereby filling the pores in the expanded vermiculite. At the same time, the volatility of γ-valerolactone is utilized to form in-situ precipitation of polyester, thereby ensuring the internal sealing and external wrapping of the expanded vermiculite and reducing the impact of the water absorption of the expanded vermiculite.

[0014] 3. The present invention uses polyester raw materials to permeate and wrap the expanded vermiculite to form internal and external fillings to solve its absorption of moisture. At the same time, silicone material is used as the outer wrapping layer to form a surface hydrophobic layer to prevent moisture from penetrating inward. DETAILED DESCRIPTION

[0015] The present invention is described in detail with reference to the embodiments, but no limitation is imposed on the claims of the present invention.

[0016] Example 1

[0017] A method for preparing a flame-retardant heat-insulating curtain comprises the following steps:

[0018] Step 1: Grind polyethylene terephthalate into fine powder, then add it into γ-valerolactone and mix it to form a polyethylene terephthalate solution, wherein the grinding temperature is 10° C., the grinding pressure is 0.3 MPa, the mass ratio of polyethylene terephthalate to γ-valerolactone is 1:12, the mixing temperature is 130° C., and the mixing is performed in a sealed manner;

[0019] Step 2, after the expanded vermiculite and ethanol are blended, wet grinding is carried out, and then the expanded vermiculite is added to the polyethylene terephthalate solution and stirred evenly. After being expanded with ether and allowed to stand, constant temperature and decompression are performed to obtain a mixed material and a recovered liquid; the mass ratio of the expanded vermiculite to the ethanol is 5:1, the temperature of the wet grinding is 10°C, the pressure is 0.3MPa, the mass ratio between the expanded vermiculite and the polyethylene terephthalate in the polyethylene terephthalate solution is 1:14, the temperature of stirring is 20°C, the stirring speed is 300r / min, the usage amount of the ether is 400% of the volume of the polyethylene terephthalate solution, the pressure of the constant temperature and decompression is 80% of the atmospheric pressure, and the temperature is 80°C;

[0020] Step 3: melt-granulate the mixture and spin it to obtain flame-retardant polyester fiber, which is then woven to obtain prefabricated flame-retardant curtains. The melt-granulation temperature is 260°C, the spinning temperature is 270°C, and the weight of the prefabricated flame-retardant curtains is 280g / m 2 ;

[0021] Step 4: Add silane to the recovered liquid and stir evenly, then quickly soak the prefabricated flame retardant curtain, take it out and let it stand for 20 minutes, and heat it for 30 minutes to obtain a flame retardant thermal insulation curtain. The silane uses methyltrichloroethane, and the concentration of silane in the recovered liquid is 400g / L. The temperature of the rapid soaking is 10°C and the time is 10s. The standing atmosphere is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10:1, the temperature is 30°C, the temperature of the heating treatment is 100°C, and the pressure is 80% of the atmospheric pressure.

[0022] The flame-retardant heat-insulating curtain prepared by the invention has a limiting oxygen index of 35% and a fire protection grade of B1. After washing 50 times, the fire protection grade still remains at B1 and the limiting oxygen index is 35%.

[0023] Example 2

[0024] A method for preparing a flame-retardant heat-insulating curtain comprises the following steps:

[0025] Step 1: Grind polyethylene terephthalate into fine powder, then add it into γ-valerolactone and mix it to form a polyethylene terephthalate solution, wherein the grinding temperature is 20° C., the grinding pressure is 0.5 MPa, the mass ratio of polyethylene terephthalate to γ-valerolactone is 1:10, the mixing temperature is 150° C., and the mixing is sealed;

[0026] Step 2, after the expanded vermiculite and ethanol are blended, wet grinding is carried out, and then the expanded vermiculite is added to the polyethylene terephthalate solution and stirred evenly. After being expanded with ether and allowed to stand, constant temperature and decompression are performed to obtain a mixed material and a recovered liquid; the mass ratio of the expanded vermiculite to the ethanol is 3:1, the temperature of the wet grinding is 20°C, the pressure is 0.5MPa, the mass ratio between the expanded vermiculite and the polyethylene terephthalate in the polyethylene terephthalate solution is 1:10, the temperature of stirring is 30°C, the stirring speed is 500r / min, the usage amount of the ether is 100% of the volume of the polyethylene terephthalate solution, the pressure of the constant temperature and decompression is 90% of the atmospheric pressure, and the temperature is 90°C;

[0027] Step 3: melt-granulate the mixture and spin it to obtain flame-retardant polyester fiber, which is then woven to obtain prefabricated flame-retardant curtains. The melt-granulation temperature is 270°C, the spinning temperature is 280°C, and the weight of the prefabricated flame-retardant curtains is 250g / m 2 ;

[0028] Step 4: Add silane to the recovered liquid and stir evenly, then quickly soak the prefabricated flame retardant curtain, take it out and let it stand for 30 minutes, and heat it for 50 minutes to obtain a flame retardant thermal insulation curtain. The silane is dimethyldichlorosilane, and the concentration of silane in the recovered liquid is 100g / L. The temperature of the rapid soaking is 20°C and the time is 20s. The standing atmosphere is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10:1, the temperature is 40°C, the temperature of the heating treatment is 120°C, and the pressure is 90% of the atmospheric pressure.

[0029] The flame-retardant heat-insulating curtain prepared by the present invention has a limiting oxygen index of 36% and a fire protection grade of B1. After washing 50 times, the fire protection grade still remains at B1 and the limiting oxygen index is 36%.

[0030] Example 3

[0031] A method for preparing a flame-retardant heat-insulating curtain comprises the following steps:

[0032] Step 1: Grind polyethylene terephthalate into fine powder, then add it into γ-valerolactone and mix it to form a polyethylene terephthalate solution, wherein the grinding temperature is 15° C., the grinding pressure is 0.4 MPa, the mass ratio of polyethylene terephthalate to γ-valerolactone is 1:11, the mixing temperature is 140° C., and the mixing is performed in a sealed manner;

[0033] Step 2, after the expanded vermiculite and ethanol are blended, wet grinding is carried out, and then the expanded vermiculite is added to the polyethylene terephthalate solution and stirred evenly. After the ether is expanded and allowed to stand, constant temperature and decompression are performed to obtain a mixed material and a recovered liquid; the mass ratio of the expanded vermiculite to the ethanol is 4:1, the temperature of the wet grinding is 15°C, the pressure is 0.4MPa, the mass ratio between the expanded vermiculite and the polyethylene terephthalate in the polyethylene terephthalate solution is 1:12, the temperature of stirring is 25°C, the stirring speed is 400r / min, the usage amount of the ether is 300% of the volume of the polyethylene terephthalate solution, the pressure of the constant temperature and decompression is 85% of the atmospheric pressure, and the temperature is 85°C;

[0034] Step 3: melt-granulate the mixture and spin it to obtain flame-retardant polyester fiber, which is then woven to obtain prefabricated flame-retardant curtains. The melt-granulation temperature is 265°C, the spinning temperature is 275°C, and the weight of the prefabricated flame-retardant curtains is 270g / m 2 ;

[0035] Step 4: Add silane to the recovered liquid and stir evenly, then quickly soak the prefabricated flame retardant curtain, take it out and let it stand for 25 minutes, and heat it for 40 minutes to obtain a flame retardant thermal insulation curtain, wherein the silane is methylethyltrichlorosilane, and the concentration of silane in the recovered liquid is 300g / L, the temperature of the rapid soaking is 15°C, the time is 15s, the atmosphere of the standing is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10:1, the temperature is 35°C, the temperature of the heating treatment is 110°C, and the pressure is 85% of the atmospheric pressure.

[0036] The flame-retardant heat-insulating curtain prepared by the present invention has a limiting oxygen index of 36% and a fire protection grade of B1. After washing 50 times, the fire protection grade still remains at B1 and the limiting oxygen index is 36%.

[0037] Comparative Example 1

[0038] A method for preparing a flame-retardant heat-insulating curtain comprises the following steps:

[0039] Step 1: Grind polyethylene terephthalate into fine powder, then add it into γ-valerolactone and mix it to form a polyethylene terephthalate solution, wherein the grinding temperature is 15° C., the grinding pressure is 0.4 MPa, the mass ratio of polyethylene terephthalate to γ-valerolactone is 1:11, the mixing temperature is 140° C., and the mixing is performed in a sealed manner;

[0040] Step 2, after the expanded vermiculite and ethanol are blended, wet grinding is carried out, and then the expanded vermiculite is added to the polyethylene terephthalate solution and stirred evenly. After the ether is expanded and allowed to stand, constant temperature and decompression are performed to obtain a mixed material and a recovered liquid; the mass ratio of the expanded vermiculite to the ethanol is 4:1, the temperature of the wet grinding is 15°C, the pressure is 0.4MPa, the mass ratio between the expanded vermiculite and the polyethylene terephthalate in the polyethylene terephthalate solution is 1:12, the temperature of stirring is 25°C, the stirring speed is 400r / min, the usage amount of the ether is 300% of the volume of the polyethylene terephthalate solution, the pressure of the constant temperature and decompression is 85% of the atmospheric pressure, and the temperature is 85°C;

[0041] Step 3: melt-granulate the mixture and spin it to obtain flame-retardant polyester fiber, which is then woven to obtain flame-retardant curtains. The melt-granulation temperature is 265°C, the spinning temperature is 275°C, and the weight of the prefabricated flame-retardant curtain is 270g / m 2 ;

[0042] The flame-retardant heat-insulating curtain prepared by the present invention has a limiting oxygen index of 32% and a fire protection grade of B1; after washing 50 times, the fire protection grade still remains at B1 and the limiting oxygen index is 32%.

[0043] Comparative Example 2

[0044] A method for preparing a flame-retardant heat-insulating curtain comprises the following steps:

[0045] Step 1: Grind polyethylene terephthalate into fine powder, then add it into γ-valerolactone and mix it to form a polyethylene terephthalate solution, wherein the grinding temperature is 15° C., the grinding pressure is 0.4 MPa, the mass ratio of polyethylene terephthalate to γ-valerolactone is 1:11, the mixing temperature is 140° C., and the mixing is performed in a sealed manner;

[0046] Step 2: The polyethylene terephthalate solution is dried under reduced pressure and then melt-granulated, and then spun to obtain flame-retardant polyester fibers, which are then woven to obtain prefabricated flame-retardant curtains. The pressure of the reduced pressure drying is 85% of the atmospheric pressure and the temperature is 85°C. The temperature of the melt granulation is 265°C and the temperature of the spinning is 275°C. The weight of the prefabricated flame-retardant curtains is 270g / m 2 ;

[0047] Step 3, the silane is added to the mixture of diethyl ether-gamma-valerolactone, stirred uniformly, then the prefabricated flame-retardant curtain is quickly soaked, after taking out, standing for 25 min, and heating treatment for 40 min, to obtain the flame-retardant thermal insulation curtain, the silane is methyl ethyl trichlorosilane, and the concentration of silane in the recovery liquid is 300 g / L, the volume ratio of diethyl ether to gamma-valerolactone in the mixture is 2:1, the temperature of the quick soaking is 15℃, and the time is 15 s, the atmosphere of the standing is the mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10:1, and the temperature is 35℃, the temperature of the heating treatment is 110℃, and the pressure is 85% of atmospheric pressure.

[0048] The prepared flame-retardant thermal insulation curtain has an limiting oxygen index of 33%, and the fireproof grade can reach B1 level, and after washing for 50 times, the fireproof grade still remains B1 level, and the limiting oxygen index is 32%.

[0049] Comparative Example 3

[0050] A preparation method of a flame-retardant thermal insulation curtain, comprising the following steps:

[0051] Step 1, the polyethylene terephthalate is finely ground, and then is put into gamma-valerolactone to mix, to form a polyethylene terephthalate solution, the temperature of the fine grinding is 15℃, and the grinding pressure is 0.4 MPa, the mass ratio of the polyethylene terephthalate to gamma-valerolactone is 1:11, the mixing temperature is 140℃, and the mixing is sealed mixing;

[0052] Step 2, the polyethylene terephthalate solution is dried under reduced pressure, then is melt granulated, and is spun to obtain flame-retardant polyester fiber, and the flame-retardant polyester fiber is woven to obtain a prefabricated flame-retardant curtain, the pressure of the drying under reduced pressure is 85% of atmospheric pressure, and the temperature is 85℃, the temperature of the melt granulation is 265℃, and the temperature of the spinning is 275℃, and the grammage of the prefabricated flame-retardant curtain is 270 g / m 2 ;

[0053] Step 3, the prefabricated flame-retardant curtain is quickly soaked into a flame-retardant liquid, and is treated by an alkali reduction one-bath method to obtain a flame-retardant thermal insulation curtain, the temperature of the quick soaking is 15℃, and the time is 15 s, and the flame retardant in the flame-retardant liquid is RZ1011.

[0054] The prepared flame-retardant thermal insulation curtain has a limiting oxygen index of 32%, and the fireproof grade can reach B1 level, and after washing for 50 times, the fireproof grade still remains B2 level, and the limiting oxygen index is 26%.

[0055] From the data comparison of the above-mentioned Examples 1-3 and Comparative Examples 1-3, it can be seen that the use of expanded vermiculite can effectively improve the flame retardant properties of the polyester curtains themselves. At the same time, the silicone layer on the surface can wrap the curtains, which not only improves the flame retardant properties of the curtains, but also has good stability, and still maintains excellent flame retardant properties after repeated washing.

[0056] It is understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced with equivalents to achieve the same technical effects; as long as the use requirements are met, they are all within the scope of protection of the present invention.

Claims

1. A method for preparing a flame-retardant heat-insulating curtain, characterized by: The steps include: Step 1: grinding polyethylene terephthalate into fine powder, and then adding the powder into γ-valerolactone and mixing the powder to form a polyethylene terephthalate solution; Step 2: blending expanded vermiculite with ethanol and then wet-grinding the mixture, adding the mixture to a polyethylene terephthalate solution and stirring evenly, dissolving the mixture in ether, standing the mixture, and then reducing the pressure at a constant temperature to obtain a mixture and a recovered liquid; Step 3, melt-granulating the mixture and spinning it to obtain flame-retardant polyester fibers, which are then woven to obtain prefabricated flame-retardant curtains; Step 4: adding silane to the recovered liquid and stirring evenly, then quickly immersing the prefabricated flame retardant curtain, taking it out and letting it stand for 20-30 minutes, heating it for 30-50 minutes, and obtaining a flame retardant heat-insulating curtain.

2. The method for preparing the flame-retardant heat-insulating curtain according to claim 1, characterized in that: The grinding temperature in step 1 is 10-20° C., and the grinding pressure is 0.3-0.5 MPa.

3. The method for preparing the flame-retardant heat-insulating curtain according to claim 1, characterized in that: The mass ratio of polyethylene terephthalate to gamma-valerolactone in step 1 is 1:10-12, the mixing temperature is 130-150° C., and the mixing is performed in a sealed manner.

4. The method for preparing the flame-retardant heat-insulating curtain according to claim 1, characterized in that: The mass ratio of expanded vermiculite to ethanol in step 2 is 3-5:1, the temperature of wet grinding is 10-20° C., and the pressure is 0.3-0.5 MPa.

5. The method for preparing the flame-retardant heat-insulating curtain according to claim 1, characterized in that: The mass ratio of the expanded vermiculite in step 2 to the polyethylene terephthalate in the polyethylene terephthalate solution is 1:10-14, the stirring temperature is 20-30° C., and the stirring speed is 300-500 r / min.

6. The method for preparing the flame-retardant heat-insulating curtain according to claim 1, characterized in that: The amount of ether used in step 2 is 100-400% of the volume of the polyethylene terephthalate solution, the pressure of the constant temperature and reduced pressure is 80-90% of the atmospheric pressure, and the temperature is 80-90°C.

7. The method for preparing the flame-retardant heat-insulating curtain according to claim 1, characterized in that: The temperature of the melt granulation in step 3 is 260-270°C, and the temperature of the spinning is 270-280°C.

8. The method for preparing the flame-retardant heat-insulating curtain according to claim 1, characterized in that: The silane in step 4 is one of methyltrichloroethane, dimethyldichlorosilane, ethyltrichlorosilane, diethyldichlorosilane and methylethyltrichlorosilane, and the concentration of the silane in the recovered liquid is 100-400 g / L.

9. The method for preparing the flame-retardant heat-insulating curtain according to claim 1, characterized in that: The temperature of the quick soaking in step 4 is 10-20° C. and the time is 10-20 seconds.

10. The method for preparing the flame-retardant heat-insulating curtain according to claim 1, characterized in that: The static atmosphere in step 4 is a mixed atmosphere of nitrogen and water vapor, with a volume ratio of nitrogen to water vapor of 10:1, a temperature of 30-40° C., a temperature of the heating treatment of 100-120° C., and a pressure of 80-90% of atmospheric pressure.