JP2000313763A - Foaming agent composition and interior trim material for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a foaming agent composition capable of suppressing fogging generation without spoiling the excellent foaming performance of azodicarbonamide, and to obtain interior trim materials for automobiles where fogging generation is suppressed. SOLUTION: This foaming agent composition for interior trim materials for automobiles is obtained by formulating 100 pts.wt. of a azodicarbonamide with 0.1-30 pts.wt. of a basic magnesium compound and/or a basic calcium compound. Alternatively, the foaming agent composition is obtained by formulating 100 pts.wt. of azodicarbonamide with 0.1-30 pts.wt. of a basic magnesium compound and/or a basic calcium compound; wherein the azodicarbonamide and/or the basic compound(s) is (are) subjected to surface-coating treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a foaming agent composition and an automotive interior material obtained using the same.

[0002]

2. Description of the Related Art For interior materials for automobiles,
A phenomenon called so-called fogging has been a problem. Fogging is a phenomenon in which traces of sublimates generated from resin materials and resin foam materials used as interior materials adhere to the inner surface of windshields, etc., and cause fogging. It is thought that light stabilizers mixed with various resins, such as halogen-based compounds compounded as flame retardants, aromatic esters used as plasticizers for polyvinyl chloride, and their mutual reaction products are the main causes. I have.

[0003]

In order to solve this problem, it has been proposed to use a polyolefin in place of polyvinyl chloride, or a plasticizer, a flame retardant, a light stabilizer and the like which generate less fogging. ing. on the other hand,
It is known that azodicarbonamide used as a foaming agent such as polyvinyl chloride and olefin causes a very small amount of decomposition residue to remain in the resin after foaming. Therefore, those decomposed residues having volatility and sublimability are also considered to be involved in fogging.

Japanese Unexamined Patent Publication No. 10-251429 discloses a foam containing a fogging inhibitor and a method for producing the same as an interior molded article for a vehicle, and azodicarbonamide is used as a foaming agent. However, this method uses alum, a porous substance, a transition metal oxide as a fogging inhibitor, and traps a substance causing fogging such as ammonia, and does not modify azodicarbonamide, which is a blowing agent at all. Absent. JP-A-50-123774 discloses that azodicarbonamide and calcium hydroxide are blended in a thermoplastic resin, and injection molding,
Production of a handle for a vehicle or the like by melt foaming is described, but it does not provide a foaming agent composition in which calcium hydroxide is directly added to azodicarbonamide and blended.

Japanese Patent Application Laid-Open No. Hei 7-173316 describes that azodicarbonamide and magnesium oxide are blended in a thermoplastic resin, and extrusion molding and foaming are carried out. However, magnesium hydroxide is directly added to azodicarbonamide. It does not provide a foaming agent composition by addition and blending. Further, JP-A-5-9322 describes that a magnesium compound is added to azodicarbonamide to obtain a foaming agent composition corresponding to a non-dangerous substance in a pressure vessel test of a dangerous substance of the Fire Service Law Class 5. However, this is intended to make azodicarbonamide a non-dangerous substance by using a magnesium compound as an azodicarbonamide decomposition inhibitor. As described above, a foaming agent composition for an automobile interior material that can effectively suppress fogging caused by azodicarbonamide has not been known.

[0006] An object of the present invention is to provide a foaming agent composition capable of suppressing the occurrence of fogging without impairing the excellent foaming performance of azodicarbonamide. Another object of the present invention is to provide an interior material for an automobile in which fogging is suppressed.

[0007]

SUMMARY OF THE INVENTION The present invention provides a foaming agent for automotive interior materials comprising a basic magnesium compound and / or a basic calcium compound in an amount of 0.1 to 30 parts by weight per 100 parts by weight of azodicarbonamide. Related to the composition. Also,
In the present invention, 0.1 to 30 parts by weight of a basic magnesium compound and / or a basic calcium compound is blended with 100 parts by weight of azodicarbonamide, and one or both of the azodicarbonamide and the basic compound are mixed. The present invention relates to a foaming agent composition having been subjected to a surface coating treatment. In addition, the present invention relates to an interior material for an automobile obtained by foaming a resin with any of the foaming agent compositions. The present invention also relates to a blowing agent composition wherein the basic magnesium compound is a magnesium alkoxide having 1 to 4 carbon atoms.

In the present invention, the reason why the fogging phenomenon is suppressed and improved is that the decomposition behavior of azodicarbonamide is changed by the uniform blending of the basic magnesium compound or the basic calcium compound, and the sublimation decomposition residue remaining in the foam. It is considered that the generation of urea or the like, which is the inspection, is suppressed. The use of azodicarbonamide that has been subjected to a surface treatment can further suppress and improve the above-mentioned fogging phenomenon,
The present inventors have also found a surprising effect that the reaction between azodicarbonamide and a basic compound, which has been a problem to date, can be prevented, and generation and solidification of ammonia can be prevented. If the time from production to use is relatively short, a material without surface coating as in claim 1 can be used.

[0009]

DETAILED DESCRIPTION OF THE INVENTION As the azodicarbonamide used in the present invention, various azodicarbonamides can be used irrespective of the production method and particle size. For example, hydrazodicarbonamide can be used with chlorine, bromine, Particle size of 3-50 obtained by oxidation with hydrogen peroxide, hypochlorites, dichromates, etc.
A powdery substance having a size of μm can be exemplified, but the present invention is not limited thereto. Azodicarbonamide has a property of being promoted to be decomposed by contacting with a basic magnesium compound and / or a basic calcium compound, and may deteriorate during storage such as generation of ammonia gas and solidification. Therefore, it is preferable that the azodicarbonamide is subjected to a surface treatment in advance to prevent direct contact with these compounds.

Examples of such surface treatment include (1) a method of coating a surface with a coupling agent, (2) a method of coating a surface with an oil or fat, and (3) a method of coating a surface with a coupling agent or an oil or fat. . As coupling agents, silane-based coupling agents, aluminum-based coupling agents,
Examples include titanate-based coupling agents. As the silane coupling agent, methyltrimethoxysilane,
Examples thereof include γ-aminopropyltriethoxysilane, N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, N-phenylaminomethyltrimethoxysilane, and vinylmethyldiethoxysilane. Examples of the aluminum-based coupling agent include aluminum isopropylate, aluminum ethylate, aluminum tris (ethyl acetoacetate), and ethyl acetoacetate aluminum diisopropylate.

As the titanate coupling agent, isopropyl triisostearoyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, tetraoctyl bis (ditridecyl phosphite)
Titanate and bis (dioctyl pyrophosphate) oxyacetate titanate can be exemplified. These coupling agents can be used alone or in combination of two or more. Examples of the fats and oils include liquid or solid fats and oils, hydrocarbons and fatty acids. Among them, as fats and oils, for example, vegetable or animal origin such as soybean oil, coconut oil, linseed oil, cottonseed oil, rapeseed oil, drill oil, pine oil, rosin, castor oil, tallow, squalane, lanolin, and hydrogenated oil Natural fats and oils and their refined products are included.

Examples of the hydrocarbons include aliphatic hydrocarbons having 20 to 48 carbon atoms and derivatives thereof and paraffin waxes and aromatic hydrocarbons having 8 to 19 carbon atoms and derivatives thereof (for example, dioctyl phthalate and the like). Dialkyl phthalates, higher alcohol phthalates such as nonyl alcohol phthalate, etc.), paraffinic, naphthenic or aromatic process oils, and liquid paraffin. Further, the hydrocarbons also include hydrocarbons isolated and purified from the above-mentioned natural fats and oils.

Examples of the fatty acids include fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid and behemic acid, and salts or derivatives thereof. The fatty acids also include fatty acids isolated and purified from the above natural fats and oils. These fats and oils can be used as they are or dissolved in an appropriate solvent. Examples of the solvent include aromatic hydrocarbons such as toluene and xylene. When the fats and oils to be used are solid at room temperature, it is preferable to adjust the temperature of the fats and oils to a liquid state by heating.

In the above surface treatment methods (1) to (3), the step of coating the azodicarbonamide and / or the basic compound with the coupling agent and / or the fats and oils is performed by using various kinds of mixing devices. It is preferable that the mixing be performed while the mixing device is, for example, a screw mixer such as a Nauta mixer, a ribbon blender such as a ribocorn mixer, a pro-share mixer, a Banbury mixer, a high-speed mixer, a super mixer, a Shinagawa mixer, or the like. .

The coating of the coupling agent and / or the fats and oils in the surface treatment method can be preferably carried out by spraying the liquid coupling agent or the fats and oils by spraying. As a method of treating a coupling agent or an oil or fat by spraying, for example, a liquid coupling agent and / or an oil or fat using a spray device, or a coupling agent and / or an oil or fat liquefied by heating, or A method of spraying a coupling agent and / or fats and oils dissolved in an appropriate solvent such as n-hexane, toluene, xylene, methanol, isopropanol, trichlene, ethyl acetate, and methyl ethyl ketone is exemplified. Examples of the spraying device include a two-fluid nozzle, a pressure nozzle, and the like.

When or after coating the coupling agent, it may be heated to 50 ° C. to 100 ° C. if necessary.
Heating at the time of coating may be performed by a method in which the coupling agent itself is heated to the temperature and treated. Thereby, solidification is prevented, and the storage stability is further improved. By using a surface-treated product as described above, direct contact between azodicarbonamide and a basic magnesium compound and / or a basic calcium compound is prevented, and long-term storage can be performed without causing performance deterioration. Is preferable.

Examples of the basic magnesium compound used in the present invention include magnesium alkoxides having about 1 to 4 carbon atoms, such as magnesium hydroxide, magnesium oxide, basic magnesium carbonate, magnesium methoxide, and magnesium alkoxide such as magnesium ethoxide. it can. Among these compounds, magnesium alkoxide reacts with a trace amount of water to form magnesium hydroxide and acts as a basic magnesium compound.
Examples of the basic calcium compound include calcium hydroxide and calcium oxide. It is preferable to use those basic compounds which have been subjected to a surface coating treatment. Examples of such a surface treatment method include the same treatment agents (for example, coupling agents and / or fats and oils) and treatments as those for the surface treatment of the azodicarbonamide. A method, for example, spraying while stirring can be exemplified.

The amount of the basic magnesium compound and / or the basic calcium compound to 100 parts by weight of azodicarbonamide is preferably 0.1 to 30 parts by weight, more preferably 0.2 to 10 parts by weight. More preferably, 0.1.
The content is preferably 5 to 5 parts by weight. If the amount is too small,
Unsatisfactory anti-fogging performance is not preferable because the foaming agent becomes unsuitable as a foaming agent for automotive interior materials. On the other hand, if the blending amount is too large, the foaming performance such as a decrease in the expansion ratio is lowered. The method of blending the basic magnesium compound and / or the basic calcium compound with azodicarbonamide is not particularly limited, and can be performed by various conventionally known methods.

Specific examples of the compounding method include (1)
A method in which powdery azodicarbonamide and a powdery basic magnesium compound and / or a basic calcium compound are uniformly dry-mixed using various mixing devices, (2) azodicarbon dissolved or dispersed in an organic solvent A method in which an amide is mixed with a basic magnesium compound and / or a basic calcium compound in a wet manner, and then dried under reduced pressure or normal pressure. (3) A powdery azodicarbonamide is dissolved or dispersed in an organic solvent while stirring. And a method of adding a basic magnesium compound and / or a basic calcium compound and coating. Examples of the solvent include n-hexane, toluene, xylene, methanol, isopropanol, trichlene, ethyl acetate, methyl ethyl ketone and the like.

Examples of the mixing device that can be used in these methods include a screw type mixer such as a Nauta mixer, a ribbon type blender such as a ribocorn mixer, a pro-share mixer, a Banbury mixer, a high speed mixer, a super mixer, and a Shinagawa mixer. Etc. can be exemplified. The method of adding the basic magnesium compound and / or the basic calcium compound dissolved or dispersed in the organic solvent by the method (3) includes spraying using a two-fluid nozzle, a pressure nozzle, or the like, or dropping. And the like. The foaming agent composition of the present invention may further contain various stabilizers, pigments, fillers, foam inhibitors and the like as long as the effects are not impaired. The blowing agent powder in which these are blended is also included in the blowing agent powder of the present invention.

Examples of the stabilizer include tribasic lead sulfate,
Examples include dibasic phosphite, lead stearate, zinc stearate, zinc carbonate, zinc oxide, barium stearate, aluminum stearate, calcium stearate, dibutyltin malate, and urea. Examples of pigments and fillers include chrome yellow, carbon black, titanium dioxide, calcium carbonate, and the like. Further, examples of the foaming inhibitor include maleic acid and the like. In the present invention, although the mechanism by which the addition of the basic magnesium compound or the basic calcium compound contributes to the suppression of fogging is not clear, the decomposition behavior of azodicarbonamide is changed by blending these compounds, and the It is presumed that this is because the generation of sublimable decomposition residues such as urea remaining in the water is suppressed.

The foaming agent composition of the present invention can be suitably used for foaming various resins, for example, polyethylene,
Polyolefin resin such as polypropylene, ethylene vinyl acetate resin (EVA resin), ethylene propylene diene copolymer resin (EPDM resin), polyolefin copolymer resin such as acrylonitrile butadiene styrene resin (ABS resin), polyvinyl chloride resin, polystyrene resin And a foaming agent such as polycarbonate resin and rubber. The amount of the foaming agent composition to be used with respect to the resin is not particularly limited and can be appropriately set according to the type of the resin and a desired expansion ratio. You can,
It is not limited to this.

The method of foaming the resin using the foaming agent composition of the present invention can be performed in the same manner as the conventional method of foaming a resin using azodicarbonamide. Such foaming methods include, for example, normal pressure foaming, extrusion foaming, injection foaming,
Press foaming and the like can be exemplified. The following method can be exemplified as the normal pressure foaming method. First, the resin powder, the foaming agent composition and other components to be blended as required are dry-mixed, and then melt-kneaded at a temperature lower than the decomposition temperature of the foaming agent (usually 190 to 210 ° C.) to obtain an extruded sheet. Thereafter, crosslinking may be performed using a crosslinking agent or an electron beam as needed. Then
The extruded sheet is heated to a temperature equal to or higher than the decomposition temperature of the foaming agent using an oven or the like, and the foaming agent is thermally decomposed to foam the resin, thereby obtaining the interior material of the present invention. Further, as the press foaming method, the following method can be exemplified. First, resin,
The foaming agent composition of the present invention, a crosslinking agent, and a foaming auxiliary compounded as necessary are kneaded using a mixing roll or the like at a resin melting temperature or higher and lower than the decomposition temperature of the foaming agent, and heated and pressed by a primary mold. In this manner, primary foaming is performed, and then the obtained primary foam is placed in a secondary mold and heated to perform secondary foaming to obtain a final foamed body.

Examples of automotive interior materials using a foamed material obtained by foaming a resin with the foaming agent composition of the present invention include:
A dashboard, a seat cushion, a seat skin, a ceiling material, a door lining material, and the like obtained by foaming the above resin can be exemplified, but the invention is not limited thereto. If the interior material of the present invention is used as an interior material for automobiles, the occurrence of fogging caused by the interior material, which has been a problem in the past, can be significantly reduced, the trouble of cleaning a windshield and the like is reduced, and a clear front view is achieved. , Which contributes to improving driving safety.

[0025]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but it should not be construed that the invention is limited thereto.

Examples 1 to 6 100 parts by weight of low-density polyethylene (density 0.922, melt flow rate MFR 3.7) were added to azodicarbonamide shown in Table 1 as a foaming agent in the form of powdered magnesium hydroxide and magnesium oxide. , 15 parts by weight of a composition prepared by blending predetermined amounts of basic magnesium carbonate and calcium hydroxide, and dicumyl peroxide (DCP) as a crosslinking agent
After adding 0.7 parts by weight and melt-kneading at 125 ° C. with a mixing roll, a 5 mm-thick sheet is taken out.
Next, a pressure of 120 kg / cm ² was applied at 130 ° C. for 5 minutes and heated and pressed to obtain a foamable uncrosslinked sheet having a thickness of 3 mm. Next, each foamable uncrosslinked sheet was placed in a gear oven heated to 220 ° C., and crosslinked and foamed to obtain a foam.

Azodicarbonamide A Median diameter 22.0 μm, aluminum coupling agent [aluminum tris (ethyl acetoacetate)]
0.2 parts are heated to about 90 ° C. and melted, and the molten coupling agent is sprayed while stirring the azodicarbonamide using a ribocorn mixer to obtain 0.2%.
Surface treated. Azodicarbonamide B Median diameter 24.5 μm, aluminum coupling agent [aluminum tris (ethyl acetoacetate)]
Heat 0.2 parts to about 90 ° C. to melt, and spray the molten coupling agent while stirring the azodicarbonamide using a ribocone mixer to obtain 0.2%.
Surface treated. Azodicarbonamide C Median diameter 11.5 μm, aluminum-based coupling agent [aluminum tris (ethyl acetoacetate)]
0.2 parts are heated to about 90 ° C. and melted, and the molten coupling agent is sprayed while stirring the azodicarbonamide using a ribocorn mixer to obtain 0.2%.
Surface treated, followed by 0.2% surface treatment by spraying liquid paraffin. Azodicarbonamide D Median diameter 24.5 μm, untreated surface. Magnesium hydroxide A Untreated product. Magnesium hydroxide B Sodium stearate 0.2
% Surface treated product

Comparative Examples 1 and 2 Foams were obtained in the same manner as in Examples 1 to 6, except that only the azodicarbonamide having a surface treatment shown in Table 1 was used as a foaming agent.

Test Example 1 From the foams produced in Examples 1 to 6 and Comparative Examples 1 and 2, 5
Cut out a test piece of 0 × 100 mm and use a
Put in a glass container and place on a transparent glass plate (50 mm x 50 mm
× 3mm, haze of glass plate itself is less than 0.4%)
Covered. Put this in a silicone bath at 100 ° C ± 2
After heating to ℃ and holding for 20 hours, integrating sphere haze meter
(JIS K 6717: Suga Test Machine Co., Ltd., direct reading
Haze computer), the incident light amount on the glass plate
T₁, Total transmitted light amount T₂, The amount of light scattered by the device T₃,apparatus
And the amount of light T scattered by the sample₄Is measured by the following equation.
Haze value (haze,%) was calculated. Table 2 shows the results. Haze value (%) = T_d/ T_t× 100 Tt (total transmittance) = T₂/ T₁  Td (diffuse transmittance) = [T₄-T₃(T₂/ T₁)] /
T₁

Examples 7 to 11 Low density polyethylene (density 0.922, MFR 3.7) 1
15 parts by weight of a composition prepared by mixing a predetermined amount of magnesium hydroxide, magnesium oxide, and calcium hydroxide in the form of fine powder with azodicarbonamide shown in Table 3 as a foaming agent was added to 00 parts by weight, and then added with a mixing roll. After melt-kneading at 125 ° C., a sheet having a thickness of 5 mm was taken out and taken out.
A pressure of 120 kg / cm ² was applied at 0 ° C. for 5 minutes and heated and pressed to obtain a foamable uncrosslinked sheet having a thickness of 1.5 mm. Next, an electron beam irradiator (75
0KV) to irradiate 5Mrad electron dose to crosslink,
The foamed crosslinked sheet was used. Next, each foamable crosslinked sheet was placed in a gear oven heated to 220 ° C.
The foam was obtained by foaming.

Comparative Examples 3 to 5 Foams were obtained in the same manner as in Examples 7 to 12, except that only the surface-treated azodicarbonamide shown in Table 3 was used as the foaming agent.

Test Example 2 In the same manner as in Test Example 1, Examples 7 to 11 and Comparative Examples 3 to
With respect to the foam made in 5, the fogging property was tested.
Table 4 shows the results.

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

[Table 3]

[0036]

[Table 4]

Example 12 A 6 wt% methanol solution of magnesium methoxide was added to untreated azodicarbonamide having a median diameter of 22.0 μm, and the mixture was uniformly blended in a mixer. An azodicarbonamide to which 0.5 wt% was added was obtained. The haze value of the foam obtained in the same manner as in Examples 1 to 6 except that this azodicarbonamide was used was 37.6% when measured in the same manner as in Test Example 1.

Comparative Example 6 The haze value of a foam obtained in the same manner as in Example 13 except that azodicarbonamide to which magnesium methoxide was not added was used. 8%.

Test Example 3 50 g of each sample of Nos. 1 to 3 described below was put into a weighing bottle, lightly capped, and allowed to stand in a thermostat at 60 ° C. for 1 month to confirm the change with time. Smells,
A decrease in the azodicarbonamide content of -0.74% was confirmed, indicating that the azodicarbonamide was decomposed. In addition, it was found that No. 2 had a slight ammonia odor and slightly decomposed azodicarbonamide. On the other hand, No. 3 had no smell of ammonia, and the content of azodicarbonamide was 0%, indicating that no azodicarbonamide was decomposed.

Sample No. 1 Azodicarbonamide D (97 parts) + Magnesium hydroxide A (3 parts) Sample No. 2 Azodicarbonamide D (97 parts)
+ Magnesium hydroxide B (3 parts) Sample No. 3 Azodicarbonamide B (97 parts)
+ Magnesium hydroxide B (3 parts)

Example 13 Magnesium hydroxide B (3% by weight) was mixed with azodicarbonamide E (97% by weight), and the same test as in Example 1 was conducted. The haze value was measured. 3%. Azodicarbonamide E Median diameter 22.0 μm, aluminum-based coupling agent [aluminum tris (ethyl acetoacetate)]
0.2 part) was dissolved in 2.5 parts of toluene and 100 parts of azodicarbonamide were mixed in a super mixer to give 5 parts.
After being subjected to surface treatment by mixing for minutes, dried.

Storage test 1 (Deposition solidification test) Each of 500 g of the foaming agent compositions of Examples 1 and 13 was filled in a 23 × 13 cm plastic bag, degassed sufficiently, and the opening was heat-sealed. And a load of 0.13 kg / cm ^{2 was} further applied from above. After 10 days, the sample was taken out, sieved with a 14-mesh sieve, the amount of non-passage was measured, and the value calculated as% was determined as the solidification value.

Storage Test 2 (Deposition Solidification Test) Sample Nos. 1 and 3 used in Test Example 3
, A solidification value was determined in the same manner as in the storage test 1.

Example 14 Low density polyethylene (density 0.922, MFR 2.0) 1
Azodicarbonamide F (median diameter: 24.5 μm, aluminum tris (ethyl acetoacetate) 0.1% treated with 0.1% by weight, heated and then further treated with liquid paraffin 0.05%) to 97% by weight to 00 parts by weight 7 parts by weight of the blowing agent composition of the present invention containing magnesium hydroxide B (3% by weight), 0.5 parts by weight of zinc oxide (decomposition accelerator), and 1.0 parts by weight of DCP (crosslinking agent) In addition, after sufficiently kneading at 120 ° C. with a mixing roll, the resin kneaded material is taken out, filled in a primary mold, and then 180 kg / cm ²
The primary foaming was performed at a heating temperature of 155 ° C. under the pressure described above to obtain a primary foam having an expansion ratio of 7 times. Next, the primary foam is placed in a secondary mold and subjected to secondary foaming under normal pressure at a heating temperature of 180 ° C. to completely decompose azodicarbonamide to obtain a final foam (secondary foam). Was.

Comparative Example 7 A foam was obtained in the same manner as in Example 14 except that azodicarbonamide D (untreated product) was used as a foaming agent. When the haze value of each of the obtained foams was measured in the same manner, it was 27.3% in Example 14 and 53.6% in Comparative Example 7.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Nobuyuki Ueda, Inventor No. 615, Satoura, Satoura-cho, Naruto City, Tokushima Prefecture Inside the Naruto Plant of Otsuka Chemical Co., Ltd. In Naruto Plant Co., Ltd. (72) Inventor Shigeru Sumitomo 463 Kagasuno, Kawauchi-cho, Tokushima City, Tokushima Prefecture Otsuka Chemical Co., Ltd.Tokushima Plant F-term (reference) BA13 BA20 BA26 CA21 CA22 CA23 CA25 CA26 DA35 4J002 AC001 BB031 BB061 BB121 BB151 BC031 BD031 BN151 CG001 DE267 EQ016 FB016 FB086 FB087 FB106 FB166 FB236 FD326 GN00

Claims (6)

[Claims] 1. A foaming composition for automobile interior materials comprising 100 parts by weight of azodicarbonamide and 0.1 to 30 parts by weight of a basic magnesium compound and / or a basic calcium compound. 2. A basic magnesium compound and / or a basic calcium compound in an amount of 0.1 to 30 parts by weight are blended with 100 parts by weight of azodicarbonamide, and one or both of the azodicarbonamide and the basic compound are mixed. A foaming agent composition having both surfaces coated. 3. The foaming agent composition according to claim 2, wherein the surface coating is a surface coating with a coupling agent and / or an oil or fat. 4. A basic magnesium compound having 1 to 1 carbon atoms.
The blowing agent composition according to claim 1, which is a magnesium alkoxide of (4). 5. The foaming agent composition according to claim 3, wherein the azodicarbonamide which is surface-coated with at least a coupling agent and which is heat-treated at the time of surface-coating or after coating the coupling agent is used. 6. An automotive interior material obtained by foaming a resin with the foaming agent composition according to claim 1.