CN109593343B - Temperature response flame-retardant film and preparation method and application thereof - Google Patents
Temperature response flame-retardant film and preparation method and application thereof Download PDFInfo
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- CN109593343B CN109593343B CN201811339146.3A CN201811339146A CN109593343B CN 109593343 B CN109593343 B CN 109593343B CN 201811339146 A CN201811339146 A CN 201811339146A CN 109593343 B CN109593343 B CN 109593343B
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- polyethylene glycol
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000003063 flame retardant Substances 0.000 title claims abstract description 86
- 230000004044 response Effects 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 63
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- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 56
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 56
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 39
- 238000000576 coating method Methods 0.000 claims abstract description 32
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- 238000001514 detection method Methods 0.000 claims abstract description 21
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- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 claims abstract description 18
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- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 claims abstract description 18
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 claims abstract description 18
- 229940033123 tannic acid Drugs 0.000 claims abstract description 18
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
- C09D171/02—Polyalkylene oxides
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
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- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
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- G—PHYSICS
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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Abstract
The invention discloses a temperature response flame-retardant film, which is formed by adding montmorillonite into a polyethylene glycol solution, then adding graphene oxide and crosslinking through a crosslinking agent. The invention also discloses a preparation method of the temperature response flame-retardant film, which comprises the following steps: adding polyethylene glycol into deionized water to obtain a polyethylene glycol solution, adding montmorillonite, performing ultrasonic treatment, adding graphene oxide, stirring, adding tannic acid, vacuumizing the obtained flame-retardant coating mixed solution to remove bubbles, and drying to obtain the temperature-responsive flame-retardant film. The invention also discloses application of the temperature response flame-retardant film in fire detection/early warning. The invention also discloses application of the temperature response flame-retardant film in the aspect of flame-retardant coatings. The temperature response flame-retardant film obtained by the invention has excellent mechanical property and flame retardance, and the resistance of the film has sensitive temperature response. The preparation method is simple to operate, low in cost and suitable for industrial large-scale production.
Description
Technical Field
The invention relates to the field of film materials, in particular to a temperature response flame-retardant film and a preparation method and application thereof.
Background
Polyethylene glycol is non-toxic, non-irritant, has good water solubility, and can be widely applied to industries such as cosmetics, pharmacy, chemical fiber, rubber, metal processing and food processing. Polyethylene glycol has a certain film-forming property, but the mechanical property of the film is extremely poor, so that the polyethylene glycol cannot be applied to actual life.
Patent specification with publication number CN 108424522 a discloses a nano-cellulose/poly-dopamine/polyethylene glycol composite material and a preparation method thereof. The specification states that polyethylene glycol is a neutral polymer, can be dissolved in water and most organic solvents, has good biocompatibility and degradability, but does not relate to the application of polyethylene glycol in the aspect of films.
Graphene is a carbon atom in sp2The two-dimensional honeycomb structure formed by hybridization has continuous large pi bonds on the surface, has excellent mechanical, electric and heat conduction properties and the like, and is an ideal enhanced function of a high polymer materialAnd (4) filling. The graphene oxide is an intermediate product in the process of synthesizing the graphene by the oxidation-reduction method, has good water solubility and chemical activity, and is easy to disperse and chemically modify. The graphene oxide is in an electrically insulating state at room temperature. When a fire occurs, the oxygen-containing groups in the graphene oxide are rapidly removed at high temperature, so that the graphene oxide is converted from an electrical insulation state to an electrical conduction state (ACS Nano,2018,12,4, 3159-3171; ACS Nano,2018,12, 416-424). Due to the property, the graphene oxide has a wide application prospect in the aspect of fire alarm, but the graphene oxide is easy to burn, and the alarm can only last for a few seconds in a fire and cannot continuously work for a long time.
The patent specification with publication number CN 108109317 a discloses a resistance type fire detection/early warning sensor, which is formed by sequentially connecting a low-voltage power supply, a warning lamp, a fire early warning composite material and a plurality of wires, wherein the fire early warning composite material is prepared from melamine foam, graphene oxide and a silicon-containing auxiliary agent, and the weight parts of the components are as follows: 25-45 parts of melamine foam, 8-40 parts of graphene oxide and 15-67 parts of silicon-containing auxiliary agent. The fire early warning composite material has the advantages of being ultra-light, good in recoverability and hydrophobic, and has ultra-sensitive fire detection/early warning performance in a fire detection/early warning sensor, but fire resistance is not involved.
The patent specification with the publication number of CN 104475053B discloses a preparation method of a stirring rod with a graphene oxide/polyethylene glycol composite sol-gel coating, wherein the graphene oxide/polyethylene glycol composite sol-gel is prepared by carrying out intercalation reaction between graphene oxide and polyethylene glycol through a solution blending method. The method can not prepare the flame-retardant film material.
Montmorillonite contains a large amount of aluminum magnesium element, is a typical inorganic filler and has excellent flame retardance. Montmorillonite is an ideal material for constructing multifunctional nanocomposites because of its excellent mechanical and flame retardant properties (j. mater. chem. a,2015,3, 21194-. However, how to synergistically modify polyethylene glycol by montmorillonite and graphene oxide to obtain a temperature response flame-retardant film with excellent mechanical properties is not reported.
Disclosure of Invention
Aiming at the defects in the field, the invention provides the temperature response flame-retardant film, overcomes the defect of extremely poor mechanical property of a pure polyethylene glycol film, has excellent flame retardance, and has sensitive resistance and temperature response.
A temperature response flame-retardant film is formed by adding montmorillonite into polyethylene glycol solution, then adding graphene oxide, and crosslinking through a crosslinking agent.
The film forming principle of the temperature response flame-retardant film is formed by strong hydrogen bond action and crosslinking action among the crosslinking agent, montmorillonite, graphene oxide and polyethylene glycol.
Preferably, the molecular weight of the polyethylene glycol is 2000-20000. The polyethylene glycol with the molecular weight range has proper viscosity, is convenient to prepare into a film and improves the quality of the film.
The cross-linking agent can adopt glutaraldehyde, the principle is to utilize the cross-linking action of aldehyde groups and hydroxyl groups or adopt tannic acid, the principle is to utilize the cross-linking action and hydrogen bonding action of the hydroxyl groups and the hydroxyl groups, and preferably, the tannic acid which can enable the mechanical property of the film to be better is adopted.
Preferably, the addition amounts of the polyethylene glycol, the montmorillonite and the graphene oxide are as follows in parts by weight:
0.5-1 part of polyethylene glycol
0.1-1% of montmorillonite
0.01-2% of graphene oxide.
The film forming quality is improved by comprehensive consideration, the synergistic effect of the graphene oxide and the montmorillonite is fully exerted, the mechanical property and the flame retardance of the temperature response flame-retardant film are enhanced, the sensitivity of the resistance of the temperature response flame-retardant film to temperature response is improved, and the like, and more preferably, the addition amount of the polyethylene glycol, the montmorillonite and the graphene oxide is as follows in parts by weight:
0.1-1% of montmorillonite
0.1-2 parts of graphene oxide.
The graphene oxide can be conventional powdered, flaky or solution graphene oxide sold in the market, and can also be one or more of graphene oxide prepared from graphite as a raw material, a narrow graphene oxide band prepared from carbon nanotubes as a raw material or a wide graphene oxide band prepared from carbon nanofibers as a raw material.
The graphene oxide is in an electrically insulating state at room temperature. The increase in temperature removes oxygen-containing groups in the graphene oxide, causing the graphene oxide to transition from an electrically insulating state to an electrically conductive state. Therefore, the introduction of the graphene oxide ensures that the resistance of the temperature response flame-retardant film has quick and sensitive temperature response.
The montmorillonite can be one or more of sodium montmorillonite, magnesium montmorillonite or calcium montmorillonite, and preferably sodium montmorillonite with good water solubility.
The montmorillonite has excellent mechanical property and flame retardant property, and is the basis for improving the mechanical property and the flame retardant property of the temperature response flame retardant film. Moreover, the montmorillonite can generate synergistic enhancement and synergistic flame retardant action with the graphene oxide, so that the temperature response flame retardant film has excellent mechanical property and flame retardance.
The invention also aims to provide a preparation method of the temperature response flame-retardant film.
The preparation method is simple to operate, low in cost and suitable for industrial large-scale production, and comprises the following steps:
(1) dissolving polyethylene glycol in deionized water to obtain a polyethylene glycol solution;
(2) adding montmorillonite into polyethylene glycol solution, adding graphene oxide after ultrasonic treatment, and stirring to obtain a mixed solution;
(3) adding a cross-linking agent into the mixed solution obtained in the step (2) to form a flame-retardant coating mixed solution;
(4) and (4) vacuumizing the mixed solution of the flame-retardant coating obtained in the step (3) to remove bubbles, and drying to obtain the temperature response flame-retardant film.
Preferably, in the step (1), the mass concentration of the polyethylene glycol solution is 0.1-10 g/L.
In the step (3), glutaraldehyde or tannic acid is used as the crosslinking agent, and commercially conventional commercial glutaraldehyde or tannic acid can be used.
In the step (4), 1 to 25 weight percent of tannic acid aqueous solution is added, and the volume of the tannic acid aqueous solution is 0.1 to 5 percent of the volume of the deionized water in the step (1).
The addition amount of tannic acid can affect the film forming rate and mechanical property, too little tannic acid can cause low film forming rate and insufficient mechanical property of the film, too much tannic acid can cause poor flexibility of the film, the integrity of the film is affected, and the mechanical property is correspondingly reduced.
It is still another object of the present invention to provide the use of the temperature-responsive flame retardant film for fire detection/early warning.
Preferably, the temperature response flame-retardant film applied to the aspects of fire detection/early warning comprises the following raw materials in parts by weight:
0.1-1% of montmorillonite
1-2 parts of graphene oxide.
The appropriate increase of the content of the graphene oxide is beneficial to improving the temperature sensitivity of the resistor of the temperature response flame-retardant film, and the timeliness and the accuracy of fire detection/early warning are ensured.
The low-voltage power supply, the alarm lamp, the temperature response flame-retardant film and the lead are connected to form the resistance type fire detection/early warning sensor. The resistance type fire detection/early warning sensor is different from a smoke sensor, not only can be used for monitoring the fire condition after the fire occurs, but also can be used for early warning the fire when the temperature is lower than the ignition point of a polymer.
The principle of the application in the aspect of fire detection/early warning is that an insulated graphene oxide network can be converted into a graphene network with good conductivity in a certain temperature environment, so that quick and sensitive fire detection/early warning response is realized.
Still another object of the present invention is to provide a method for preparing a flame retardant coating, comprising the steps of:
(1) preparing a flame-retardant coating and mixing.
The flame-retardant coating mixed solution is prepared by the steps (1) to (3) of the preparation method of the temperature response flame-retardant film.
(2) And immersing the flammable substrate in the mixed solution, taking out, airing, and repeating the operations of immersing, taking out and airing to obtain the flame-retardant coating covered with the temperature-response flame-retardant film.
The inflammable substrate is paper or cosmetic cotton and the like.
Preferably, the addition amount of the polyethylene glycol, the montmorillonite and the graphene oxide in the flame-retardant coating mixed solution obtained in the step (3) is as follows in parts by weight:
0.1-1% of montmorillonite
0.1-2 parts of graphene oxide.
The temperature response flame-retardant film forms a flame-retardant coating on the surface of inflammables such as paper, cosmetic cotton and the like, so that the high-efficiency flame retardance of the inflammable materials is realized.
Compared with the prior art, the invention has the main advantages that:
(1) the graphene oxide and montmorillonite are synergistically modified to polyethylene glycol, the temperature response flame-retardant film is obtained, the defect of extremely poor mechanical property of a pure polyethylene glycol film is overcome, excellent flame retardance is achieved, and the resistance of the film has sensitive temperature response.
(2) The preparation method is simple to operate, low in cost and suitable for industrial large-scale production.
(3) The temperature response flame-retardant film can be applied to fire detection/early warning, has quick and sensitive fire detection/early warning response, can be used for monitoring the fire condition after the fire occurs, and can also be used for early warning of the fire when the temperature is lower than the ignition point of the polymer. In addition, the problem that pure graphene oxide is easy to burn and consume in a fire disaster is solved by utilizing the characteristic of fire resistance, and the alarm time is obviously prolonged.
(4) The temperature response flame-retardant film can be applied to a flame-retardant coating to realize high-efficiency flame retardance of a flammable material.
Drawings
FIG. 1 is a photograph of a temperature responsive flame retardant film (PMG) prepared in example 1;
FIG. 2 is a graph of tensile stress strain curves for the PMG prepared in example 1 and the montmorillonite-modified polyethylene glycol film (PM) prepared in comparative example 2;
FIG. 3 is a comparative photograph of combustion of PMG prepared in example 1, PM prepared in comparative example 2, and pure polyethylene glycol film prepared in comparative example 1;
FIG. 4 is a schematic diagram of the components of a resistive fire detection/warning sensor;
FIG. 5 is a photograph of a flame test of the PMG prepared in example 1;
FIG. 6 is a flame detection photograph of PM prepared in comparative example 2;
FIG. 7 is a photograph of a paper coated with a flame retardant coating layer of PMG prepared in example 1, compared to a cosmetic cotton before and after combustion;
fig. 8 is a photograph of a comparison of paper and cotton pad before and after combustion.
Detailed Description
The invention is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out under conventional conditions or conditions recommended by the manufacturers.
Example 1
Dissolving 125mg of polyethylene glycol in 50mL of deionized water to obtain a polyethylene glycol solution, uniformly stirring, adding 125mg of montmorillonite, stirring, performing ultrasonic treatment for 1h, and adding 11.12mL (11.24mg mL) of graphene oxide-1) Stirring for 3h, adding 0.25mL of tannic acid aqueous solution with the weight percentage concentration of 5% to obtain flame-retardant coating mixed solution, finally vacuumizing and exhausting bubbles of the flame-retardant coating mixed solution, and drying at 50 ℃ to obtain the temperature response flame-retardant film (PMG).
Bending and folding the PMG prepared in example 1 with tweezers, as shown in fig. 1, it can be seen that the PMG prepared in example 1 can be bent and folded, which shows that the temperature-responsive flame-retardant film of the present invention exhibits moderate mechanical interference to the outside and has good mechanical elasticity. Usually inevitable bending, compression and impact will have no effect on its performance.
Comparative example 1
Compared with example 1, the difference is that no montmorillonite, graphene oxide and tannic acid are added, and other conditions are the same, so that pure polyethylene glycol film (P) is obtained.
Comparative example 2
Compared with example 1, except that graphene oxide and tannic acid are not added, the montmorillonite modified polyethylene glycol film (PM) is obtained under the same other conditions.
The PMG prepared in example 1 and the PM prepared in comparative example 2 are cut into a fixed strip shape, and a stress-strain curve is measured by using a dynamic thermomechanical analyzer, as shown in FIG. 2, the result shows that the mechanical property of the temperature response flame-retardant film is obviously better, which indicates that the graphene oxide and the montmorillonite have a synergistic enhancement effect.
The PMG prepared in example 1, the PM prepared in comparative example 2 and the P prepared in comparative example 1 are respectively put on the flame of an alcohol burner to burn, and as shown in figure 3, the result shows that the graphene oxide and the montmorillonite have a synergistic flame retardant effect.
Example 2
Dissolving 125mg of polyethylene glycol in 50mL of deionized water to obtain a polyethylene glycol solution, uniformly stirring, adding 125mg of montmorillonite, stirring, performing ultrasonic treatment for 1h, and adding 1.11mL (11.24mg mL) of graphene oxide-1) Stirring for 3h, adding 0.1mL of glutaraldehyde to obtain a flame-retardant coating mixed solution, finally vacuumizing the flame-retardant coating mixed solution to remove bubbles, and drying at 50 ℃ to obtain the temperature-response flame-retardant film.
Example 3
Dissolving 125mg of polyethylene glycol in 50mL of deionized water to obtain a polyethylene glycol solution, uniformly stirring, adding 62.5mg of montmorillonite, stirring, performing ultrasonic treatment for 1.5h, and adding 5.56mL (11.24mg mL) of graphene oxide-1) Stirring for 2.5h, adding 10 wt% tannic acid water solution 0.2mL to obtain a productAnd burning the coating mixed solution, finally vacuumizing and exhausting bubbles of the obtained flame-retardant coating mixed solution, and drying at 60 ℃ to obtain the temperature-response flame-retardant film.
Example 4
Dissolving 125mg of polyethylene glycol in 40mL of deionized water to obtain a polyethylene glycol solution, uniformly stirring, adding 12.5mg of montmorillonite, stirring, performing ultrasonic treatment for 0.5h, and adding 22.24mL (11.24mg mL) of graphene oxide-1) Stirring for 3.5h, adding 0.6mL of tannic acid aqueous solution with the weight percentage concentration of 2.5% to obtain flame-retardant coating mixed solution, finally vacuumizing and exhausting bubbles of the flame-retardant coating mixed solution, and drying at 60 ℃ to obtain the temperature-response flame-retardant film.
Example 5
Dissolving 250mg of polyethylene glycol in 50mL of deionized water to obtain a polyethylene glycol solution, uniformly stirring, adding 125mg of montmorillonite, stirring, performing ultrasonic treatment for 1h, adding 125mg of graphene oxide narrow band prepared by taking carbon nanotubes as a raw material, stirring for 3h, adding 0.25mL of tannic acid aqueous solution with the weight percentage concentration of 5% to obtain a flame-retardant coating mixed solution, finally performing vacuum-pumping and bubble-discharging on the obtained flame-retardant coating mixed solution, and drying at 40 ℃ to obtain the temperature-response flame-retardant film.
Application example 1 resistance type fire detection/early warning sensor
Dry batteries, warning lamps, and PMG prepared in example 1 were connected by wires as shown in fig. 4 to obtain a resistance type fire detection/warning sensor. As shown in fig. 5, in the case of a fire simulated by an alcohol burner flame, PMG is restored, resistance is rapidly lowered, a resistance type fire detection/warning sensor lights up to alarm, and a continuous fire warning signal is provided.
The dry cell, the warning lamp, and the PM prepared in comparative example 2 were connected by a wire to form a sensor for comparison. As shown in fig. 6, in the case of a fire simulated by an alcohol burner flame, PM is broken, and the alarm lamp is not lit, indicating that graphene oxide is crucial for fire detection/alarm.
Application example 2 flame retardant coating
The paper coated with the coating layer of PMG prepared in example 1 and the cosmetic cotton were respectively put in a flame of an alcohol burner, as shown in fig. 7, showing that PMG has flame retardancy and the shapes of the paper and the cosmetic cotton were substantially maintained after the flame.
In contrast, when the paper and the cotton pad were put in a flame of an alcohol burner, as shown in fig. 8, the paper and the cotton pad were rapidly burned and were not flame-retardant.
Furthermore, it should be understood that various changes and modifications of the present invention can be made by those skilled in the art after reading the above teachings of the present invention, and these equivalents also fall within the scope of the present invention as defined by the appended claims.
Claims (9)
1. A temperature response flame-retardant film is characterized in that montmorillonite is added into a polyethylene glycol solution, then graphene oxide is added, and crosslinking is carried out through a crosslinking agent to form the film;
the cross-linking agent is tannic acid.
2. The temperature-responsive flame-retardant film according to claim 1, wherein the polyethylene glycol has a molecular weight of 2000 to 20000.
3. The temperature-responsive flame-retardant film according to claim 1, wherein the polyethylene glycol, the montmorillonite and the graphene oxide are added in the following amounts by weight:
0.5-1 part of polyethylene glycol
0.1-1% of montmorillonite
0.01-2% of graphene oxide.
4. The method for preparing a temperature-responsive flame-retardant film according to any one of claims 1 to 3, comprising:
(1) dissolving polyethylene glycol in deionized water to obtain a polyethylene glycol solution;
(2) adding montmorillonite into polyethylene glycol solution, adding graphene oxide after ultrasonic treatment, and stirring to obtain a mixed solution;
(3) adding a cross-linking agent into the mixed solution obtained in the step (2) to form a flame-retardant coating mixed solution;
(4) and (4) vacuumizing the mixed solution of the flame-retardant coating obtained in the step (3) to remove bubbles, and drying to obtain the temperature response flame-retardant film.
5. The method according to claim 4, wherein the crosslinking agent is added in step (3) as an aqueous solution of tannic acid having a concentration of 1 to 25% by weight, and the amount of the crosslinking agent is 0.1 to 5% by volume based on the volume of deionized water in step (1).
6. Use of a temperature responsive flame retardant film according to any of claims 1 to 3 for fire detection and early warning.
7. The application of the temperature response flame-retardant film in the aspects of fire detection and early warning according to claim 6, wherein the addition amount of the polyethylene glycol, the montmorillonite and the graphene oxide is as follows in parts by weight:
polyethylene glycol 1
0.1-1% of montmorillonite
1-2 parts of graphene oxide.
8. Use of a temperature responsive flame retardant film according to any of claims 1 to 3 in a flame retardant coating.
9. The use of the temperature-responsive flame-retardant film according to claim 8 as a flame-retardant coating, wherein the flame-retardant coating is prepared by a method comprising:
(1) preparing the flame retardant coating mixture of step (3) of claim 4;
(2) and immersing the flammable substrate in the flame-retardant coating mixed solution, taking out, airing, repeating the operations of immersing, taking out and airing to obtain the flame-retardant coating covered with the temperature-response flame-retardant film, wherein the addition amount of the polyethylene glycol, the montmorillonite and the graphene oxide in the flame-retardant coating mixed solution is as follows in parts by weight:
polyethylene glycol 1
0.1-1% of montmorillonite
0.1-2 parts of graphene oxide.
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| CN111560197A (en) * | 2020-06-24 | 2020-08-21 | 北京理工大学珠海学院 | Flame-retardant nano composite environment-friendly coating and preparation method thereof |
| CN112358772B (en) * | 2020-11-12 | 2022-05-24 | 华南理工大学 | Flexible flame-retardant coating with sensitive temperature sensing and fire early warning functions and preparation method and application thereof |
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