CN108017898B - Flame-retardant polyurethane elastomer material for furniture and preparation method thereof - Google Patents

Flame-retardant polyurethane elastomer material for furniture and preparation method thereof Download PDF

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CN108017898B
CN108017898B CN201711276057.4A CN201711276057A CN108017898B CN 108017898 B CN108017898 B CN 108017898B CN 201711276057 A CN201711276057 A CN 201711276057A CN 108017898 B CN108017898 B CN 108017898B
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flame
polyurethane elastomer
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何建雄
王一良
杨博
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Dongguan Xionglin New Materials Technology Co Ltd
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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
    • C08K13/00Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/04Ingredients characterised by their shape and organic or inorganic ingredients
    • CCHEMISTRY; METALLURGY
    • 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
    • C08K3/38Boron-containing compounds
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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
    • C08K5/00Use of organic ingredients
    • C08K5/16Nitrogen-containing compounds
    • C08K5/34Heterocyclic compounds having nitrogen in the ring
    • C08K5/3467Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
    • C08K5/3472Five-membered rings
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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
    • C08K5/00Use of organic ingredients
    • C08K5/36Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/43Compounds containing sulfur bound to nitrogen
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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
    • C08K7/00Use of ingredients characterised by shape
    • C08K7/22Expanded, porous or hollow particles
    • C08K7/24Expanded, porous or hollow particles 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
    • C08K2201/00Specific properties of additives
    • C08K2201/002Physical properties
    • C08K2201/003Additives being defined by their diameter
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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
    • C08K2201/00Specific properties of additives
    • C08K2201/011Nanostructured additives
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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
    • C08K2201/00Specific properties of additives
    • C08K2201/014Additives containing two or more different additives of the same subgroup in C08K
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    • C08L2201/02Flame or fire retardant/resistant

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Abstract

The invention provides a flame-retardant polyurethane elastomer material for furniture and a preparation method thereof. The flame-retardant polyurethane elastomer material comprises the following raw material components in parts by mass: 100 parts of polyurethane elastomer, 1-3 parts of ionic liquid, 4-8 parts of boron ion exchanger, 15-30 parts of aluminum sol and 5-15 parts of expandable graphite. The flame-retardant polyurethane elastomer material is prepared by mixing and reacting ionic liquid, boron ion exchanger, alumina sol and expandable graphite, and then melting and blending the obtained solid component and polyurethane elastomer. The flame-retardant polyurethane elastomer material provided by the invention has high flame-retardant performance, no micromolecule flame retardant is separated out in the using process, the flame-retardant performance is effective for a long time, and the flame-retardant polyurethane elastomer material is particularly suitable for furniture such as sofas, mattresses, seat armrests and the like.

Description

Flame-retardant polyurethane elastomer material for furniture and preparation method thereof
Technical Field
The invention belongs to the technical field of polyurethane materials, and particularly relates to a flame-retardant polyurethane elastomer material for furniture and a preparation method thereof.
Background
Thermoplastic polyurethane elastomer (TPU) is one of the plastics commonly used in the life at present, has the characteristics of combining the processing technical performance of the plastics and the physical and mechanical performance of rubber, and has the mechanical properties of high elasticity, high strength, high wear resistance, radiation resistance, oil resistance, low-temperature brittleness resistance, adjustable hardness in a large range and the like. However, the application of the TPU is limited and extremely easy to burn, the TPU has violent flame and strong black smoke when burning, the heat release amount is large, and meanwhile, the TPU has serious dripping phenomenon, so that the TPU has great limitation when being directly applied, and the research on the flame-retardant polyurethane elastomer material is always a hotspot of the current polyurethane material research.
In the traditional flame-retardant method, halogen elements with high-efficiency flame retardance are introduced into materials, but the materials can release a large amount of toxic and harmful gases during combustion, so that great secondary harm is caused to human bodies and the environment. CN105440652A discloses a flame-retardant thermoplastic polyurethane elastomer and a preparation method thereof, wherein the polyurethane elastomer is subjected to flame-retardant modification by adopting ionic liquid and intumescent flame retardants (such as aluminum hypophosphite, ammonium polyphosphate and the like), but the ionic liquid is small molecules and is liquid at normal temperature, and is easy to migrate and separate out from a base material, so that the flame retardance of the material is lost. And the used intumescent flame retardant has higher addition amount and has negative influence on the mechanical property of the material. In addition, the flame retardant property of the polyurethane elastomer material for furniture is more demanding, and therefore the flame retardant property of the polyurethane elastomer material is to be further improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a flame-retardant polyurethane elastomer material for furniture and a preparation method thereof. The polyurethane elastomer material has high flame retardant property, no micromolecule flame retardant is separated out in the using process, the flame retardant property is effective for a long time, and the polyurethane elastomer material is particularly suitable for furniture such as sofas, mattresses, seat armrests and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a flame-retardant polyurethane elastomer material for furniture, which comprises the following raw material components in parts by mass:
Figure GDA0002472201600000021
the ionic liquid has certain flame retardant capability, but the ionic liquid has small molecular weight and is liquid at normal temperature, and is easy to migrate and separate out in a base material, so that the material gradually loses the flame retardant capability. The expandable graphite is an expandable flame retardant, when heated, the inserts among the graphite layers are decomposed or gasified, so that the graphite layers are expanded to form a worm-shaped expanded carbon layer which has the functions of heat insulation, oxygen isolation, smoke suppression and molten drop prevention, but the expandable graphite with smaller particle size has poor flame retardant property because the gas generated by the heating of the intercalant among the graphite layers does not expand the graphite layers and escapes from among the graphite layers. Therefore, the expandable graphite is usually in the micron or even millimeter level, but the larger particle size of the expandable graphite is liable to cause the reduction of the mechanical properties of the material.
The invention adopts boron ion exchanger and aluminum sol to form flame-retardant nanometer boron-aluminum hydroxide particles in alkaline environment, which are complexed with ionic liquid on one hand to prevent the ionic liquid from migrating and separating out; on the other hand, the gaps among the expandable graphite sheets are blocked, so that the expandable graphite with smaller particle size also has good flame retardant property, thereby reducing the adverse effect of the expandable graphite with large particle size on the mechanical property of the base material. The raw materials are matched with each other at a specific ratio, so that the flame retardant polyurethane elastomer has a synergistic flame retardant effect and improves the flame retardant property of the polyurethane elastomer.
In the present invention, the ionic liquid may be 1 part, 1.1 part, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3 parts or the like by mass.
The boron ion exchanger may be 4 parts, 4.2 parts, 4.3 parts, 4.5 parts, 4.6 parts, 4.8 parts, 5 parts, 5.2 parts, 5.3 parts, 5.5 parts, 5.6 parts, 5.8 parts, 6 parts, 6.2 parts, 6.3 parts, 6.5 parts, 6.6 parts, 6.8 parts, 7 parts, 7.2 parts, 7.3 parts, 7.5 parts, 7.6 parts, 7.8 parts, 8 parts or the like by mass.
The aluminum sol may be 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, or the like by mass.
The mass portion of the expandable graphite can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts and the like.
As a preferred technical scheme of the invention, the flame-retardant polyurethane elastomer material comprises the following raw material components in parts by mass:
Figure GDA0002472201600000031
as a preferred technical scheme of the invention, the flame-retardant polyurethane elastomer material comprises the following raw material components in parts by mass:
Figure GDA0002472201600000032
Figure GDA0002472201600000041
as a preferred embodiment of the present invention, the ionic liquid is one or a combination of at least two selected from N-methyl, propylpiperidine bistrifluoromethanesulfonimide salt, 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium tetrafluoroborate, and 1-methyl-3-ethylimidazolium chloride; typical but non-limiting examples of such combinations are: a combination of N-methyl, propylpiperidine bistrifluoromethanesulfonimide salt and 1-ethyl-3-methylimidazolium hexafluorophosphate, a combination of N-methyl, propylpiperidine bistrifluoromethanesulfonimide salt and 1-ethyl-3-methylimidazolium tetrafluoroborate, N-methyl, propyl piperidine bistrifluoromethylsulfonyl imide salt in combination with 1-methyl-3-ethylimidazole chloride, 1-ethyl-3-methylimidazolium hexafluorophosphate salt in combination with 1-ethyl-3-methylimidazolium tetrafluoroborate salt, 1-ethyl-3-methylimidazolium hexafluorophosphate salt in combination with 1-methyl-3-ethylimidazole chloride, 1-ethyl-3-methylimidazolium tetrafluoroborate salt in combination with 1-methyl-3-ethylimidazole chloride, and the like.
In a preferred embodiment of the present invention, the boron-based ion exchanger is sodium metaborate or boric acid.
As a preferable technical scheme of the invention, the concentration of the aluminum sol is 20-30 wt%; for example, it may be 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, or the like.
As a preferable technical scheme of the invention, the particle size of the expandable graphite is 500nm-10 μm; for example, it may be 500nm, 550nm, 600nm, 650nm, 700nm, 750nm, 800nm, 850nm, 900nm, 950nm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm.
On the other hand, the invention provides a preparation method of the flame-retardant polyurethane elastomer material, which comprises the following steps:
(1) mixing the ionic liquid, the boron ion exchanger, the alumina sol and the expandable graphite according to the formula, and adjusting the pH value to 7.5-9 for reaction;
(2) carrying out solid-liquid separation on the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) melting and blending the solid component obtained in the step (2) with a polyurethane elastomer to obtain the flame-retardant polyurethane elastomer material.
As a preferred embodiment of the present invention, the mixing and reaction in step (1) are carried out under stirring.
Preferably, the stirring speed is 300-500 r/min; for example, it may be 300r/min, 320r/min, 350r/min, 380r/min, 400r/min, 420r/min, 450r/min, 480r/min, or 500 r/min.
Preferably, the mixing time in step (1) is 12-24 h; for example, 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h, 24h, or the like may be used.
Preferably, the reaction temperature in step (1) is 80-100 ℃, for example, 80 ℃, 82 ℃, 83 ℃, 85 ℃, 86 ℃, 88 ℃, 90 ℃, 92 ℃, 93 ℃, 95 ℃, 96 ℃, 98 ℃ or 100 ℃ and the like; the time is 3 to 6 hours, and may be, for example, 3 hours, 3.2 hours, 3.5 hours, 3.8 hours, 4 hours, 4.2 hours, 4.5 hours, 4.8 hours, or 5 hours.
Preferably, the solid-liquid separation method in step (2) is centrifugal separation.
Preferably, the melt blending in step (3) is carried out in an internal mixer.
Preferably, the melt blending temperature is 150-180 ℃, for example can be 150 ℃, 152 ℃, 155 ℃, 158 ℃, 160 ℃, 162 ℃, 165 ℃, 168 ℃, 170 ℃, 172 ℃, 175 ℃, 178 ℃ or 180 ℃ etc.; the time is 15-30min, such as 15min, 16min, 17min, 18min, 19min, 20min, 21min, 22min, 23min, 24min, 25min, 26min, 27min, 28min, 29min or 30 min.
As a preferred technical scheme of the invention, the preparation method comprises the following steps:
(1) according to the formula, mixing ionic liquid, boron ion exchanger, alumina sol and expandable graphite for 12-24h at the stirring speed of 300-500r/min, adjusting the pH value to 7.5-9, and reacting for 3-6h at the temperature of 80-100 ℃;
(2) centrifugally separating the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) adding the solid component obtained in the step (2) and the polyurethane elastomer into an internal mixer, and carrying out melt blending for 15-30min at the temperature of 150-180 ℃ to obtain the flame-retardant polyurethane elastomer material.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts boron ion exchanger and aluminum sol to form flame-retardant nanometer boron-aluminum hydroxide particles in alkaline environment, which are complexed with ionic liquid on one hand to prevent the ionic liquid from migrating and separating out; and on the other hand, the gaps among the expandable graphite sheets are blocked, and the particle size of the required expandable graphite is reduced. The flame-retardant additives are matched with each other, so that the polyurethane elastomer material has good flame-retardant performance.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The flame-retardant polyurethane elastomer material for furniture comprises the following raw material components in parts by mass:
Figure GDA0002472201600000061
wherein the ionic liquid is 1-ethyl-3-methylimidazolium hexafluorophosphate, the boron ion exchanger is boric acid, the concentration of the aluminum sol is 20 wt%, and the particle size of the expandable graphite is 500 nm.
The preparation method of the flame-retardant polyurethane elastomer material comprises the following steps:
(1) according to the formula, mixing ionic liquid, boron ion exchanger, alumina sol and expandable graphite for 24 hours at the stirring speed of 300r/min, adjusting the pH value to 7.5, and reacting for 3 hours at the temperature of 100 ℃;
(2) centrifugally separating the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) adding the solid component obtained in the step (2) and a polyurethane elastomer into an internal mixer, and carrying out melt blending for 30min at the temperature of 150 ℃ to obtain the flame-retardant polyurethane elastomer material.
Example 2
The flame-retardant polyurethane elastomer material for furniture comprises the following raw material components in parts by mass:
Figure GDA0002472201600000071
wherein the ionic liquid is 1-ethyl-3-methylimidazole tetrafluoroborate, the boron ion exchanger is sodium metaborate, the concentration of the aluminum sol is 30 wt%, and the particle size of the expandable graphite is 10 mu m.
The preparation method of the flame-retardant polyurethane elastomer material comprises the following steps:
(1) according to the formula, mixing ionic liquid, boron ion exchanger, alumina sol and expandable graphite for 12h at the stirring speed of 500r/min, adjusting the pH to 9, and reacting for 6h at 80 ℃;
(2) centrifugally separating the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) adding the solid component obtained in the step (2) and the polyurethane elastomer into an internal mixer, and carrying out melt blending for 15min at 180 ℃ to obtain the flame-retardant polyurethane elastomer material.
Example 3
The flame-retardant polyurethane elastomer material for furniture comprises the following raw material components in parts by mass:
Figure GDA0002472201600000072
wherein the ionic liquid is 1-methyl-3-ethylimidazole chloride, the boron ion exchanger is sodium metaborate, the concentration of the aluminum sol is 28 wt%, and the particle size of the expandable graphite is 800 nm.
The preparation method of the flame-retardant polyurethane elastomer material comprises the following steps:
(1) according to the formula, mixing ionic liquid, boron ion exchanger, alumina sol and expandable graphite for 20h at the stirring speed of 350r/min, adjusting the pH value to 8, and reacting for 4h at 90 ℃;
(2) centrifugally separating the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) adding the solid component obtained in the step (2) and a polyurethane elastomer into an internal mixer, and carrying out melt blending for 20min at the temperature of 170 ℃ to obtain the flame-retardant polyurethane elastomer material.
Example 4
The flame-retardant polyurethane elastomer material for furniture comprises the following raw material components in parts by mass:
Figure GDA0002472201600000081
wherein the ionic liquid is 1-ethyl-3-methylimidazolium hexafluorophosphate, the boron ion exchanger is boric acid, the concentration of the aluminum sol is 23 wt%, and the particle size of the expandable graphite is 1 mu m.
The preparation method of the flame-retardant polyurethane elastomer material comprises the following steps:
(1) according to the formula, mixing ionic liquid, boron ion exchanger, alumina sol and expandable graphite for 18h at the stirring speed of 400r/min, adjusting the pH value to 8, and reacting for 5h at 85 ℃;
(2) centrifugally separating the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) adding the solid component obtained in the step (2) and the polyurethane elastomer into an internal mixer, and carrying out melt blending for 25min at 160 ℃ to obtain the flame-retardant polyurethane elastomer material.
Example 5
The flame-retardant polyurethane elastomer material for furniture comprises the following raw material components in parts by mass:
Figure GDA0002472201600000091
wherein the ionic liquid is N-methyl, propyl piperidine bistrifluoromethanesulfonylimide salt, the boron ion exchanger is sodium metaborate, the concentration of the aluminum sol is 25 wt%, and the particle size of the expandable graphite is 5 μm.
The preparation method of the flame-retardant polyurethane elastomer material comprises the following steps:
(1) according to the formula, mixing ionic liquid, boron ion exchanger, alumina sol and expandable graphite for 24 hours at the stirring speed of 400r/min, adjusting the pH value to 8.2, and reacting for 4 hours at the temperature of 100 ℃;
(2) centrifugally separating the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) adding the solid component obtained in the step (2) and the polyurethane elastomer into an internal mixer, and carrying out melt blending at 160 ℃ for 20min to obtain the flame-retardant polyurethane elastomer material.
Comparative example 1
The difference from the example 1 is that the dosage of the ionic liquid is 0, the mass part of the expandable graphite is 6, and other raw materials, dosage and preparation method are the same as the example 1.
Comparative example 2
The difference from example 1 is that the boron ion exchanger was used in an amount of 0, the alumina sol concentration was 46.7 wt%, and other raw materials, amounts and preparation methods were the same as those of example 1.
Comparative example 3
The difference from example 1 is that the amount of the aluminum sol used is 0, the mass part of the boron ion exchanger is 14, and the other raw materials, the amounts and the preparation method are the same as those of example 1.
Comparative example 4
The difference from the example 1 is that the amount of the expandable graphite is 0, the mass part of the ionic liquid is 6, and other raw materials, the amount and the preparation method are the same as those of the example 1.
The flame retardant property of the flame retardant polyurethane elastomer materials provided in examples 1 to 5 and comparative examples 1 to 4 above was tested, and the test standards and results are shown in the following table 1:
TABLE 1
Figure GDA0002472201600000101
As can be seen from the results in Table 1, the flame retardant property of the polyurethane elastomer material is improved by the synergistic flame retardant effect among the components, and the flame retardant property of the material is reduced when any component is lacked.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (11)

1. The flame-retardant polyurethane elastomer material for furniture is characterized by comprising the following raw material components in parts by mass:
Figure FDA0002472201590000011
the ionic liquid is selected from one or the combination of at least two of N-methyl, propyl piperidine bistrifluoromethanesulfonimide salt, 1-ethyl-3-methylimidazole hexafluorophosphate, 1-ethyl-3-methylimidazole tetrafluoroborate or 1-methyl-3-ethylimidazole chloride;
the boron ion exchanger is sodium metaborate or boric acid, the concentration of the aluminum sol is 20-30 wt%, and the particle size of the expandable graphite is 500nm-10 μm;
the preparation method of the flame-retardant polyurethane elastomer material comprises the following steps:
(1) mixing ionic liquid, boron ion exchanger, alumina sol and expandable graphite according to a formula, and adjusting the pH to 7.5-9 for reaction at 80-100 ℃ for 3-6 h;
(2) carrying out solid-liquid separation on the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) melting and blending the solid component obtained in the step (2) with a polyurethane elastomer to obtain the flame-retardant polyurethane elastomer material.
2. The flame-retardant polyurethane elastomer material as claimed in claim 1, wherein the flame-retardant polyurethane elastomer material comprises the following raw materials in parts by mass:
Figure FDA0002472201590000012
Figure FDA0002472201590000021
3. the flame-retardant polyurethane elastomer material as claimed in claim 1, wherein the flame-retardant polyurethane elastomer material comprises the following raw materials in parts by mass:
Figure FDA0002472201590000022
4. the method for preparing a flame-retardant polyurethane elastomer material according to any one of claims 1 to 3, which is characterized by comprising the steps of:
(1) mixing ionic liquid, boron ion exchanger, alumina sol and expandable graphite according to a formula, and adjusting the pH to 7.5-9 for reaction at 80-100 ℃ for 3-6 h;
(2) carrying out solid-liquid separation on the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) melting and blending the solid component obtained in the step (2) with a polyurethane elastomer to obtain the flame-retardant polyurethane elastomer material.
5. The method according to claim 4, wherein the mixing and reacting in step (1) are carried out under stirring.
6. The method of claim 5, wherein the stirring is at a rate of 300 to 500 r/min.
7. The method according to claim 4, wherein the mixing time in step (1) is 12 to 24 hours.
8. The production method according to claim 4, wherein the solid-liquid separation method in the step (2) is centrifugal separation.
9. The method according to claim 4, wherein the melt blending in step (3) is carried out in an internal mixer.
10. The method of claim 4, wherein the melt blending is carried out at a temperature of 150 to 180 ℃ for a time of 15 to 30 min.
11. The method of claim 4, comprising the steps of:
(1) according to the formula, mixing ionic liquid, boron ion exchanger, alumina sol and expandable graphite for 12-24h at the stirring speed of 300-500r/min, adjusting the pH value to 7.5-9, and reacting for 3-6h at the temperature of 80-100 ℃;
(2) centrifugally separating the mixed solution obtained in the step (1), and then washing and drying;
(3) and (3) adding the solid component obtained in the step (2) and the polyurethane elastomer into an internal mixer, and carrying out melt blending for 15-30min at the temperature of 150-180 ℃ to obtain the flame-retardant polyurethane elastomer material.
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