JP7535262B2 - Flame retardants, flame retardant resins and flame retardant paints - Google Patents

Description

The present invention relates to a flame retardant that is added to various resins to make them flame retardant, and to a flame-retardant resin material that contains the flame retardant.

2. Description of the Related Art Flame retardants have been developed to be added to resin materials to make the resin materials flame retardant.
For example, Patent Document 1 (JP 2006-265417 A) describes a flame-retardant resin composition that is highly flame-retardant without generating harmful gases, does not significantly reduce polymer properties, and is excellent in recyclability, and that contains specific flame-retardant particles having a volume average particle size of 1 to 500 nm and a flame-retardant auxiliary, in which the flame-retardant particles are a hydrate of a metal containing Mg and one or more selected from Ca, Al, Fe, Zn, Ba, Cu, and Ni, or a hydrate of one metal selected from Mg, Ca, Al, Fe, Zn, Ba, Cu, and Ni, and the flame-retardant auxiliary is one or more selected from a boric acid-based flame-retardant auxiliary, a silicone compound, and a nitrogen-based flame-retardant auxiliary (see, in particular, paragraphs 0010 and 0013 to 0018).
In addition, Patent Document 2 (JP 2015-63674 A) describes a flame retardant additive for resins that can improve the flame retardancy of various resins by adding it to the resin, the flame retardant additive for resins containing red phosphorus, a phosphate-containing flame retardant, and a dispersion medium, the content of red phosphorus being in the range of 25 to 75% by weight, the content of the phosphate-containing flame retardant being in the range of 75 to 25% by weight, and the content of the dispersion medium being in the range of 30 to 180 parts by weight, relative to 100 parts by weight of the total of the red phosphorus and the phosphate-containing flame retardant, and the weight ratio of the dispersion medium to the red phosphorus being in the range of 0.75 to 4.0 (see, in particular, paragraphs 0011 and 0013).

However, a flame retardant that has performance equal to or greater than the flame retardant additive for resins described in Patent Document 2 and is equal to or less toxic than the flame-retardant resin composition described in Patent Document 1 has not yet been realized, and there has been a demand for a flame retardant that combines the properties of both.

JP 2006-265417 A JP 2015-63674 A

The present invention has been made in consideration of the above-mentioned requirements, and has as its first object to provide a flame retardant that can be added to various resins to impart sufficient flame retardancy and non-combustibility, and to provide a flame retardant that has low toxicity.
A second object of the present invention is to provide a molded body of a flame-retardant resin material into which the flame retardant has been mixed or impregnated, and to provide a flame-retardant resin material that can be mixed with an adhesive resin material or water-based paint and applied to other molded bodies.

The invention according to claim 1 is a flame retardant comprising an iron oxide powder containing a phosphorus component that has been subjected to a first surface treatment and an ammonium sulfate powder that has been subjected to a second surface treatment different from the first surface treatment,
the first surface treatment is a surface treatment using a surface treatment agent having a surfactant function and a terminal carboxylic acid group or a terminal sulfonic acid group;
the second surface treatment is a surface treatment using any one of melamine, silicone resin, triphenyl phosphate, polyvinyl alcohol, vinyl acetate resin, nitrocellulose resin, tannic acid, lauric acid, propyl gallate, and dodecyl gallate ;
The mixture ratio of the iron oxide powder containing a phosphorus component that has been subjected to the first surface treatment and the ammonium sulfate powder that has been subjected to the second surface treatment is 10:90 to 90:10 .

The invention according to claim 2 is a flame-retardant resin characterized in that the resin contains the flame retardant according to claim 1 in an amount of 2 to 50%.

The invention according to claim 3 is the flame-retardant resin according to claim 2 ,
The resin is characterized in that it is a polyolefin resin or a reaction-curing resin.

The invention according to claim 4 is the flame-retardant resin according to claim 3 ,
The polyolefin resin is any one of polyvinyl alcohol , polystyrene , methacrylic resin, fluororesin , acrylonitrile butadiene styrene resin, acrylonitrile styrene resin and butadiene.

The invention according to claim 5 is the flame-retardant resin according to claim 3 ,
The reactive curing resin is any one of a urethane resin, an epoxy resin, and a phenol resin.

The sixth aspect of the present invention is a flame-retardant paint comprising the flame retardant of the first aspect in an amount of 2 to 60%.

The invention according to claim 7 is the flame-retardant paint according to claim 6 ,
The paint is characterized in that it is any one of vinyl acetate resin-based, acrylic resin-based, epoxy resin-based, phenolic resin-based, chlorinated rubber-based, polyurethane resin-based, fluororesin-based, nitrocellulose-based and phthalic acid resin-based paints.

According to the first aspect of the present invention, when the flame retardant of the present invention is added to a resin material, a rapid endothermic reaction occurs near the combustion temperature of the resin material, so that the combustion of the resin material can be suppressed.

According to the inventions of claims 2 to 5 , the resin (polyolefin resin or reaction curing resin in claim 3 , any one of polyolefin resins such as polyvinyl alcohol , polystyrene , methacrylic resin, fluororesin , acrylonitrile butadiene styrene resin, acrylonitrile styrene resin and butadiene in claim 4 , any one of reaction curing resins such as urethane resin, epoxy resin and phenol resin in claim 5 ) contains 2 to 50% of the flame retardant of claim 1 , and a rapid endothermic reaction occurs near the combustion temperature of the resin, so that a flame retardant resin with high combustion suppression function can be provided.

According to the inventions of claims 6 and 7 , the paint (vinyl acetate resin-based, acrylic resin - based, epoxy resin-based, phenolic resin-based, chlorinated rubber-based, polyurethane resin-based, fluororesin-based, nitrocellulose-based and phthalic acid resin-based paint in claim 7) contains 2 to 60% of the flame retardant of claim 1 , and a rapid endothermic reaction occurs near the combustion temperature of the paint. Therefore, by applying the paint to the surface of a structure made of resin, wood, paper, etc., it is possible to manufacture and provide a structure that is difficult to burn.

FIG. 1 is a flow chart showing an outline of a process for producing a flame retardant. 1 is a graph showing the results of thermal analysis of a flame retardant obtained by mixing untreated iron oxide powder and ammonium sulfate powder, and a flame retardant obtained by mixing surface-treated iron oxide powder and ammonium sulfate powder. 1 is a graph showing the results of thermal analysis of a substrate itself, a flame-retardant resin material in which a conventional flame retardant is added to a substrate, and a flame-retardant resin material in which the flame retardant of the present invention is added to a substrate. Photographs showing the results of a combustion experiment of an untreated polystyrene foam molding and a polystyrene foam molding coated with the flame-retardant resin material of Example 7.

FIG. 1 is a flow chart showing an outline of the process for producing the flame retardant of the present invention.
The process for producing the flame retardant of the present invention is roughly divided into three steps as shown in FIG.
The first process involves mixing iron oxide powder with phosphorus components and the like, drying the mixture, mixing the resulting dried powder with a surface treatment agent, stirring the mixture in a stirrer, and then drying to obtain treated iron oxide powder.
The second step involves mixing ammonium sulfate powder with a surface treatment agent, pulverizing the mixture in a grinder, and then heat-treating the mixture at 160 to 220°C to obtain treated ammonium sulfate powder.
The third step is to mix the treated iron oxide powder obtained in the first step and the treated ammonium sulfate powder obtained in the second step in an appropriate mixing ratio.
Here, the iron oxide powder may be either powdered diiron trioxide ( _Fe2O3 ) or powdered triiron _tetroxide ( _Fe3O4 ), and the phosphorus component may be a phosphate such as ammonium dihydrogen phosphate and water, diammonium hydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, or _phosphoric acid.
In addition, the mixing ratio of the obtained treated iron oxide powder and treated ammonium sulfate powder is basically 50:50, but according to experiments, a rapid endothermic reaction at about 380°C, which is the combustion temperature of resin materials, which is a characteristic of the flame retardant of the present invention, has been confirmed when the mixing ratio is 10:90 to 90:10.
However, in order to cause a sufficient endothermic reaction, the ratio is preferably 25:75 to 65:35, and more preferably 35:65 to 55:45.

Surface treatment agents must be selected appropriately depending on the application of the flame retardant, but they can be roughly divided into the following four types:
(1) When the flame retardant is added to a polyolefin resin, a surface treatment agent to be mixed with the dried powder: Select a surfactant having a carboxylic acid or sulfonic acid group at the end, such as lauric acid, stearic acid, oleic acid, or dodecyl sulfuric acid.
Surface treatment agent to be mixed with ammonium sulfate powder: Select one from melamine, silicone resin, triphenyl phosphate, polyvinyl alcohol, vinyl acetate resin and nitrocellulose resin.
In addition, these also have the effect of increasing the water resistance of ammonium sulfate, which is useful when storing the flame retardant for long periods of time.
(2) In the case of adding a flame retardant to a two-component reactive curing resin, the surface treatment agent to be mixed with the dried powder is selected from triphenyl phosphate, stearic acid, lauric acid, and dodecyl sulfate, and ethyl silicate or propylamine trimethyl silicate is used in combination as a silane coupling agent.
Surface treatment agent to be mixed with ammonium sulfate powder: Select one from triphenyl phosphate, melamine, and tannic acid.
The reason is that when the resin raw material reacts and hardens, the ammonium sulfate powder may interfere with the reaction.
(3) When the flame retardant is added to polyvinyl acetate resin (wood glue) or water-soluble substances, the surface treatment agent to be mixed with the dried powder is dodecyl sulfate, a surfactant, to improve dispersibility.
Surface treatment agent to be mixed with ammonium sulfate powder: Since it is necessary to make ammonium sulfate water resistant, select one of tannic acid and polyvinyl alcohol.
(4) When the flame retardant is added to a lipophilic solvent, the surface treatment agent to be mixed with the dried powder is lauric acid or stearic acid, since iron oxide is hydrophilic.
Surface treatment agent to be mixed with ammonium sulfate powder: Select one from triphenyl phosphate and tannic acid.

A method for producing the flame retardant according to the first embodiment will be described.
First, the steps for obtaining the treated iron oxide powder will be explained step by step.
(Step 1-1) 500 g of iron oxide sludge (moisture content: 45-50%) having a median particle size of 0.2-10 μm, ammonium dihydrogen phosphate (10-500 g), and 500 g of water are mixed and subjected to a filter press.
This produces a mixed sludge containing iron oxide and iron phosphate with a moisture content of 20%, and the ratio of iron oxide to iron phosphate is adjusted to 50:50 to 80:20 by increasing or decreasing the amount of ammonium dihydrogen phosphate depending on the application of the flame retardant.
That is, if there is a large amount of iron oxide, the resin is less likely to form char but has a large endothermic effect, and if there is a large amount of iron phosphate, the resin is more likely to form char but has a small endothermic effect. Therefore, for example, when the flame retardant according to Example 1 is added to a synthetic resin such as polypropylene that does not easily form char, the ratio of iron oxide to iron phosphate is adjusted to about 50:50, and when the flame retardant is added to a synthetic resin such as urethane resin that easily forms char, the ratio of iron oxide to iron phosphate is adjusted to about 80:20.
(Step 1-2) The mixed sludge obtained in step 1-1 is dried at 105° C. for 1 to 2 hours.
(Step 1-3) 20 g of a surface treatment agent selected from any one of lauric acid, stearic acid, oleic acid, phosphoric acid esters (triphenyl phosphate, trimethyl phosphate), and dodecyl sulfate is added to the dried mixed sludge, and the mixture is placed in a Henschel mixer and stirred at 2,500 rpm for approximately 30 minutes.
(Step 1-4) The surface-treated powder removed from the Henschel mixer is sieved to adjust the particle size, and then dried at 120° C. for about 1 hour.
Treated iron oxide powder can be obtained by the above steps. However, if the amount of iron oxide is large, the dried mixed sludge cannot be pulverized by stirring with a Henschel mixer. Therefore, a pulverization step using a pulverizer must be added between steps 1-2 and 1-3.

Next, the steps for obtaining treated ammonium sulfate powder will be described step by step.
(Step 1-5) 500 g of ammonium sulfate powder and melamine (10 to 15% of the ammonium sulfate powder, i.e., 50 to 75 g) are pulverized in a high-speed rotary pulverizer to adjust the median particle size to 10 to 50 μm.
(Step 1-6) The surface-treated powder taken out from the pulverizer is heat-treated at 160 to 220°C.
By the above steps, a treated ammonium sulfate powder in which melamine is bound to ammonium sulfate can be obtained.
The treated iron oxide powder obtained in steps 1-1 to 1-4 and the treated ammonium sulfate powder obtained in steps 1-5 and 1-6 are mixed together to obtain the flame retardant of Example 1.
In addition, steps 1-1 to 1-4 and steps 1-5 and 1-6 may be performed in parallel, steps 1-1 to 1-4 may be performed first and steps 1-5 and 1-6 may be performed later, or steps 1-5 and 1-6 may be performed first and steps 1-1 to 1-4 may be performed later.

A method for producing the flame retardant according to the second embodiment will be described.
However, since the process for obtaining the treated iron oxide powder is the same as in Example 1, only the process for obtaining the treated ammonium sulfate powder will be explained step by step.
(Step 2-5) 500 g of ammonium sulfate powder and lauric acid or propyl gallate (10 to 15% of the ammonium sulfate powder, i.e., 50 to 75 g) are pulverized in a high-speed rotary pulverizer to adjust the median particle size to 10 to 50 μm.
(Step 2-6) The surface-treated powder taken out from the pulverizer is heat-treated at 120°C.
By the above steps, a treated ammonium sulfate powder in which lauric acid or propyl gallate is bound to ammonium sulfate can be obtained.
The treated iron oxide powder obtained in steps 1-1 to 1-4 and the treated ammonium sulfate powder obtained in steps 2-5 and 2-6 are mixed together to obtain the flame retardant of Example 2.
The order of steps 1-1 to 1-4 and steps 2-5 and 2-6 can be freely selected, as in the first embodiment.

Next, a method for producing a flame-retardant resin material by adding the flame retardant according to Example 1 or 2 to various resin materials will be described.
The flame-retardant resin material in Example 3 is foamed polypropylene.
(Step 3-1) Using a twin-screw kneader, 90% polypropylene and 10% mixed powder of citric acid and sodium bicarbonate as a foaming agent are heated and mixed at 140°C.
(Step 3-2) The treated iron oxide powder, which has been surface-treated with stearic acid, is added to the polypropylene and mixed powder in an amount of 20% of the total amount, and mixed uniformly.
(Step 3-3) 20% of treated ammonium sulfate powder that has been surface-treated with melamine is added and mixed until uniform.
(Step 3-4) Heat to 160°C to foam and extrude into a mold.
It was confirmed that the polypropylene foam obtained by the above process had a flame retardancy equivalent to V0 of UL94 (1/16), a standard for evaluating flame retardancy.

The flame-retardant resin material in Example 4 is foamed polyvinyl chloride.
(Step 4-1) Using a twin-screw kneader, 90% vinyl chloride and 10% mixed powder of citric acid and sodium bicarbonate as a foaming agent are heated and mixed at 140°C.
(Step 4-2) The treated iron oxide powder, which has been surface-treated with stearic acid, is added to the polyvinyl chloride and the mixed powder in an amount of 15% by weight, and mixed uniformly.
(Step 4-3) 15% of treated ammonium sulfate powder that has been surface-treated with melamine is added and mixed until uniform.
(Step 4-4) Heat to 160° C. to foam, and extrude into a mold.
It was confirmed that the polyvinyl chloride foam obtained by the above process had flame retardancy equivalent to V0 of UL94 (1/16), a standard for evaluating flame retardancy.

The flame-retardant resin material according to Example 5 is a two-component mixed type polyurethane foam.
(Step 5-1) The flame retardant of Example 1 or 2 is added to the reaction liquid containing polyol as the main component so as to be 40%.
(Step 5-2) The two reaction liquids for the polyurethane foam are mixed together to cause a foaming reaction.
(Step 5-3) While foaming, the mixture is extruded into a mold.
It was confirmed that the polyurethane foam obtained by the above process had flame retardancy equivalent to V0 of UL94 (1/16), a standard for evaluating flame retardancy.

The flame-retardant resin material in Example 6 is polypropylene that is injection molded.
(Step 6-1) Using a twin-screw kneader, 15% of treated iron oxide powder that has been surface-treated with stearic acid is added to polypropylene and mixed uniformly.
(Step 6-2) 15% of treated ammonium sulfate powder that has been surface-treated with triphenyl phosphate is added and mixed until uniform.
(Step 6-3) Heat to 180°C and injection mold.
It was confirmed that the polypropylene injection molded article obtained by the above process had a flame retardancy performance equivalent to V0 of UL94 (1/16), a standard for evaluating flame retardancy.

Next, a method will be described in which the flame retardant according to Example 1 or 2 is mixed with an adhesive resin material or an aqueous paint to obtain a flame-retardant resin material, and the flame-retardant resin material is applied to the surface of various molded articles.
In Example 7, a flame retardant and the like are added to a resin material having adhesive properties, and the molded body to which the flame retardant resin material obtained by adding a flame retardant and the like to the resin material is applied is a polystyrene foam molded body.
(Step 7-1) A mixture of 70% isopropyl alcohol and 30% styrene monomer is mixed with the flame retardant of Example 1 or 2 in the same amount as the mixture.
(Step 7-2) Add 1% styrene monomer hardener and mix, then apply to the polystyrene foam body with a brush within 10 minutes.
(Step 7-3) The flame-retardant resin material obtained by adding the flame retardant and styrene monomer curing agent to the mixed liquid is left to dry and harden.
The polystyrene foam molded body with hardened flame-retardant resin material on the surface obtained by the above process does not burn with a methane gas burner. It was confirmed that when heating is continued, the heat is transferred and the polystyrene foam inside deforms, but the hardened flame-retardant resin material remains in its original shape.

In Example 8, a flame retardant is added to the water-based paint, and the molded article to which the flame-retardant resin material obtained by adding the flame retardant to the water-based paint is applied is a molded article made of paper or wood.
(Step 8-1) Add the same amount of flame retardant obtained by mixing the treated iron oxide powder of Example 1 or 2 with treated ammonium sulfate powder that has been surface-treated with one selected from triphenyl phosphate, melamine, and dodecyl gallate to a vinyl acetate emulsion adhesive and mix until uniform.
(Step 8-2) A flame-retardant resin material is applied to the surface of a molded article made of paper or wood with a brush.
(Step 8-3) The flame-retardant resin material applied to the surface is left to dry and harden.
The flame-retardant resin material hardened on the surface obtained by the above steps becomes a coating film with a flame retardant content of 50% or more after hardening. This coating film does not burn with a methane gas burner, so it is possible to prevent flammable gas generated from the substrate from flowing toward the burner.
In addition, since oxygen is prevented from flowing into the substrate, ignition does not occur until the temperature of the substrate reaches 800° C. or higher.

Fig. 2 is a graph showing the thermal analysis results of a flame retardant made by mixing untreated iron oxide powder and ammonium sulfate powder, and a flame retardant made by mixing surface-treated iron oxide powder and ammonium sulfate powder. In the figure, "Fe3O4" indicates a flame retardant made by mixing powdered iron trioxide ( _Fe3O4 ) and _ammonium sulfate powder without any treatment, " _Fe2O3 " indicates a flame retardant made by mixing powdered iron trioxide ( _Fe2O3 ) and ammonium sulfate powder without any treatment, and "Flame retardant of the present invention" indicates a flame retardant made by mixing powdered iron oxide (including iron trioxide and iron trioxide) and ammonium sulfate powder after surface treatment.
The methods of thermal analysis are differential thermal analysis (DTA) and thermogravimetry (TG).
From FIG. 2(a), which is a graph of the differential thermal analysis results, and FIG. 2(b), which is a graph of the thermogravimetric analysis results, it can be seen that a rapid endothermic reaction occurs at about 300° C. for each flame retardant.
In "Fe3O4" and "Fe2O3", although a continuous endothermic reaction is observed even at 400 to 600°C, no endothermic reaction beyond the endothermic reaction at around 300°C occurs.
In addition, in the case of "Fe3O4" and "Fe2O3", ammonium sulfate decomposes at around 300°C, and at the same time, a reaction occurs between the iron oxide and the sulfuric acid component, producing a compound whose main component is iron sulfate.
In contrast, in the "flame retardant of the present invention", a large endothermic reaction occurs at around 380°C, which exceeds the endothermic reaction at around 300°C, and a rapid weight loss occurs.
Here, the temperature of 380° C. is approximately the same as the temperature at which resin materials such as plastics decompose and generate flammable gases, that is, the combustion temperature.
Therefore, according to the "flame retardant of the present invention," since a very large endothermic reaction occurs at around 380° C., it is expected that adding the flame retardant to a resin material will have the effect of suppressing combustion of the resin material.
Furthermore, in the "flame retardant of the present invention," a similar reaction between iron oxide and sulfuric acid occurs at around 380°C, but a compound containing iron alum as the main component is produced. Since iron alum maintains a molten state up to 600°C, it is expected that this will have the effect of blocking oxygen by covering the surface of the resin material.
Although iron phosphate was not mixed into the "flame retardant of the present invention" in FIG. 2, in reality, iron phosphate was mixed in, which promoted the production of iron alum and also promoted the carbonization of the surrounding organic matter with the phosphorus component, thereby further enhancing the flame retardancy.

3 is a graph showing the results of thermal analysis of the substrate itself (polyurethane foam), a flame-retardant resin material with a conventional flame retardant added to the substrate, and a flame-retardant resin material with the flame retardant of the present invention added to the substrate. In the figure, "substrate" indicates the polyurethane foam itself, "conventional flame retardant" indicates the flame-retardant resin material with a conventional flame retardant added to the polyurethane foam, and "flame retardant of the present invention" indicates the flame-retardant resin material with the flame retardant of the present invention added to the polyurethane foam.
From FIG. 3(a) which is a graph of the differential thermal analysis results and FIG. 3(b) which is a graph of the thermogravimetric analysis results, it can be seen that in the "base material", oxidation begins to occur at around 200°C, combustible gas is generated at a small peak point at around 350°C, and then carbonization occurs and the charred material burns at around 550°C.
In addition, with the "conventional flame retardant," the peak of flammable gas generation at around 350° C. is suppressed, but a combustion peak accompanied by a rapid weight loss is observed at around 500° C. For this reason, it is expected that in an actual fire, the polyurethane foam will burst into flames.
In contrast, in the "flame retardant of the present invention," a continuous oxidation reaction occurs at 400 to 500°C, generating heat, but no heat is generated above 500°C. And since there is no sudden heat generation around 550°C in the "substrate" or around 500°C in the "conventional flame retardant," it is believed that no combustion is occurring. Therefore, in an actual fire, it is expected that the shape will be maintained, although the material will turn black and become carbonized.

FIG. 4 is a photograph showing the results of a combustion experiment of an untreated polystyrene foam molded body (length 8 cm, width 5 cm) and a polystyrene foam molded body (length 10 cm, width 5 cm) coated with the flame-retardant resin material of Example 7.
Figure 4(a) is a photograph showing the former molded body after it has been hung up and a candle flame has been applied to it below for one minute, Figure 4(b) is a photograph showing the latter molded body after it has been hung up and a candle flame has been applied to it below for one minute, and Figure 4(c) is a photograph showing the state of the latter molded body after it has been hung up and a candle flame has been applied to it below for one minute from the state of Figure 4(b) and the candle has been removed.
From these photographs, it can be seen that the fire spreads to the former molded body and it bursts into flames, whereas the fire does not spread to the latter molded body at all, as shown in FIG. 4(b), and even after being exposed to a candle flame for a long time, only candle soot adheres to it.

Modifications of the flame retardants and the manufacturing methods of the flame-retardant resin materials of Examples 1 to 8 are listed below.
(1) In Examples 1 to 3, a Henschel mixer was used as the stirring device. However, any type of stirring device may be used, such as a stirrer that rotates stirring blades other than a Henschel mixer, a ball mill, a vibration stirrer, etc.
(2) In Examples 1 to 4, 6 and 7, no specific heating means was used. However, any device capable of heating powder, such as a hot plate or a baking device capable of maintaining an internal temperature at any desired temperature up to about 300° C., or an electric heater or other device capable of heating foamed resin may be used.

(3) In Examples 7 and 8, the flame retardant was mixed into the water-based paint. However, the flame retardant may be mixed into various types of paint, not limited to water-based paint. The paint may be selected from vinyl acetate resin-based, acrylic resin-based, epoxy resin-based, phenolic resin-based, chlorinated rubber-based, polyurethane resin-based, fluororesin-based, nitrocellulose-based and phthalic acid resin-based paints.
Furthermore, if the flame retardant is contained in the paint in an amount of 2 to 60%, the paint will function as a flame retardant paint, but if the flame retardant is contained in an amount of 30 to 60%, a more effective flame retardant paint can be obtained.
(4) The polyolefin resin to which the flame retardant is added may be selected from the group consisting of polyvinyl alcohol , polystyrene , methacrylic resin, fluororesin , acrylonitrile butadiene styrene resin, acrylonitrile styrene resin and butadiene.
(5) The reactive curing resin to which the flame retardant is added may be selected from the group consisting of urethane resin, epoxy resin, and phenol resin.

The present invention provides a flame retardant with excellent performance, which can be used to produce flame-retardant resin material molded bodies by adding the flame retardant to various resin materials and molding them. Various molded bodies can be made flame-retardant by applying a mixture of the flame retardant and adhesive resin material or water-based paint to the surface of the body. Also, excellent heat insulating materials can be produced by mixing the flame retardant with cellulose fiber, etc.

Claims (7)

A flame retardant comprising an iron oxide powder containing a phosphorus component that has been subjected to a first surface treatment and an ammonium sulfate powder that has been subjected to a second surface treatment different from the first surface treatment,
the first surface treatment is a surface treatment using a surface treatment agent having a surfactant function and a terminal carboxylic acid group or a terminal sulfonic acid group;
the second surface treatment is a surface treatment using any one of melamine, silicone resin, triphenyl phosphate, polyvinyl alcohol, vinyl acetate resin, nitrocellulose resin, tannic acid, lauric acid, propyl gallate, and dodecyl gallate ;
The mixing ratio of the iron oxide powder containing a phosphorus component that has been subjected to the first surface treatment and the ammonium sulfate powder that has been subjected to the second surface treatment is 10:90 to 90:10.
A flame retardant characterized by: A flame-retardant resin comprising the flame retardant of claim 1 in an amount of 2 to 50%. The flame-retardant resin according to claim 2 , wherein the resin is a polyolefin resin or a reaction-curing resin. 4. The flame-retardant resin according to claim 3 , wherein the polyolefin resin is any one of polyvinyl alcohol , polystyrene , methacrylic resin, fluororesin , acrylonitrile butadiene styrene resin, acrylonitrile styrene resin, and butadiene. 4. The flame-retardant resin according to claim 3 , wherein the reaction-curing resin is any one of a urethane resin, an epoxy resin, and a phenol resin. A flame retardant paint comprising the flame retardant of claim 1 in an amount of 2 to 60%. 7. The flame-retardant paint according to claim 6, wherein the paint is any one of vinyl acetate resin-based, acrylic resin-based, epoxy resin-based, phenolic resin-based, chlorinated rubber-based, polyurethane resin-based, fluororesin-based, nitrocellulose-based and phthalic acid resin - based paints.