JP2009286991A - Method of manufacturing interior material for automobile - Google Patents

Abstract

The present invention provides a method for producing an automobile interior material, which can produce an automobile interior material excellent in long-term heat resistance and fogging efficiency by reaction injection molding.
In a method for producing an automobile interior material, an isocyanate component containing 1,3-bis (isocyanatomethyl) cyclohexane, a trimer of hexamethylene diisocyanate, a polyol, and dimethyltindineodecanoate are provided. Then, a polyol component containing dibutyltin dimethyl maleate is subjected to reaction injection molding.
[Selection figure] None

Description

  The present invention relates to a method for manufacturing automobile interior materials such as automobile dashboards and door trims.

Conventionally, reaction injection molded products formed by reaction injection molding of thermosetting polyurethane resin have excellent long-term heat resistance and light resistance. For example, automobiles exposed to high-temperature environments such as automobile dashboards and door trims. Used as interior material.
With regard to a method for producing such a reaction injection molded article, an isocyanate blend containing a mixture of a trimer of isophorone diisocyanate (IPDI) and a monomer and a thixotropic agent, and addition polymerization of propylene oxide and ethylene oxide to glycerin A polyol blend containing a polyol, a chain extender (ethylene glycol), a crosslinking agent (diethanolamine), a zeolite catalyst (sodium aluminum silicate) and other additives (color pigments, etc.) There has been proposed a manufacturing method in which a mold set at ° C. is reacted and molded (see, for example, Patent Document 1).
Special table 2005-530011

However, in the production method described in Patent Document 1, since a mixture of a trimer of isophorone diisocyanate having poor reactivity and a monomer is used as the polyisocyanate component, the mold temperature is set to 80 ° C. or higher. There is a problem that the production efficiency is low.
In addition to excellent long-term heat resistance, automobile interior materials are required to reduce fogging, which is an index of the degree of occurrence of fogging phenomenon that causes poor visibility of automobiles.

  The objective of this invention is providing the manufacturing method of the automotive interior material which can manufacture the automotive interior material excellent in long-term heat resistance and fogging property by reaction injection molding efficiently.

  In order to achieve the above object, a method for producing an automobile interior material according to the present invention comprises an isocyanate component containing 1,3-bis (isocyanatomethyl) cyclohexane and a trimer of hexamethylene diisocyanate, a polyol, It is characterized by reaction injection molding a dimethyltin dineodecanoate and a polyol component containing dibutyltin dimethyl maleate.

  Further, in the method for producing an automobile interior material of the present invention, dimethyltin dineodecanoate is contained in an amount of 0.05 to 0.4% by mass, and dibutyltin dimethyl maleate is contained in an amount of 0.05 to 0.6% by mass. It is preferable to obtain an automobile interior material.

  According to the method for producing an automobile interior material of the present invention, an automobile interior material having excellent long-term heat resistance and fogging properties can be produced with high production efficiency by reaction injection molding.

In the automobile interior material manufacturing method of the present invention, an isocyanate component and a polyol component are subjected to reaction injection molding.
The isocyanate component contains 1,3-bis (isocyanatomethyl) cyclohexane and a trimer of hexamethylene diisocyanate (trimer).
Examples of 1,3-bis (isocyanatomethyl) cyclohexane include known 1,3-bis (isocyanatomethyl) cyclohexane, and examples of such commercially available products include Takenate 600 manufactured by Mitsui Chemicals Polyurethanes. .

As a trimer (trimer) of hexamethylene diisocyanate, a known hexamethylene diisocyanate trimer (trimer) can be used. As such a commercial product, Takenate D170N manufactured by Mitsui Chemicals Polyurethanes, Inc. can be used.
In addition, the isocyanate component contains a polyisocyanate such as an alicyclic polyisocyanate and / or an araliphatic polyisocyanate together with a trimer of 1,3-bis (isocyanatomethyl) cyclohexane and hexamethylene diisocyanate. Can be made. Examples of the alicyclic polyisocyanate include 1,3-cyclopentane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, 4,4′-methylenebis (cyclohexyl isocyanate). ), Methyl-2,4-cyclohexane diisocyanate, methyl-2,6-cyclohexane diisocyanate, 1,3-bis (isocyanatoethyl) cyclohexane, 2,5 and / or 2,6-di (isocyanatomethyl) bicyclo [ 2,2,1] heptane, isophorone diisocyanate and the like. Of these, preferably, isophorone diisocyanate, 2,5 and / or 2,6-di (isocyanatomethyl) bicyclo [2,2,1] heptane can be used.

  Examples of the araliphatic polyisocyanate include 1,3-bis (isocyanatomethyl) benzene, tetramethylxylylene diisocyanate, and ω, ω′-diisocyanate-1,4-diethylbenzene. Of these, 1,3-bis (isocyanatomethyl) benzene and tetramethylxylylene diisocyanate are preferable.

These polyisocyanates can be used alone or in combination of two or more.
In the isocyanate component, 1,3-bis (isocyanatomethyl) cyclohexane and, if necessary, alicyclic polyisocyanate and / or araliphatic polyisocyanate and hexamethylene diisocyanate trimer are mixed by weight. The ratio is, for example, 90:10 to 40:60, preferably 80:20 to 50:50, and more preferably 80:20 to 60:40.
And in order to prepare an isocyanate component, each said component (namely, the trimer of 1, 3-bis (isocyanatomethyl) cyclohexane and hexamethylene diisocyanate as an essential component) is mix | blended, for example, well-known Stir and mix with a stirrer and degas.

The isocyanate component can also be prepared as a polyisocyanate polyol-modified product (hereinafter sometimes simply referred to as a polyol-modified product) by modifying each of the above components with a polyol.
Examples of the polyol include a low molecular weight polyol and a high molecular weight polyol described later. Among these, Preferably, the low molecular weight polyol whose number average molecular weight is 100-400, and the high molecular weight polyol whose number average molecular weight is 400-10000 are mentioned.

  And when preparing an isocyanate component as a polyol modified body, for example, the above 1,3-bis (isocyanatomethyl) cyclohexane, an alicyclic polyisocyanate and / or an araliphatic polyisocyanate contained if necessary, And a trimer of hexamethylene diisocyanate (trimer) and a polyol, a polyisocyanate, an alicyclic polyisocyanate and / or an araliphatic polyisocyanate, and hexamethylene diisocyanate 3 if necessary, with respect to the hydroxyl group of the polyol. The molar ratio (isocyanate group / hydroxyl group) of the isocyanate group of the trimer is, for example, 2 to 100, preferably 3 to 60, for example, at 70 to 100 ° C. for 1 to 5 hours. React.

The polyisocyanate-modified polyisocyanate thus obtained has an isocyanate group content of, for example, 20% by mass or more, preferably 23 to 32% by mass, and more preferably 24 to 30% by mass. is there.
In the present invention, the polyol component contains a polyol, and further contains dimethyltin dineodecanoate and dibutyltin dimethyl maleate as a urethanization catalyst.

Examples of the polyol include a high molecular weight polyol.
The high molecular weight polyol has two or more hydroxyl groups in one molecule, and the number average molecular weight is, for example, 400 to 10000, preferably 1400 to 9000, more preferably 3000 to 8000, and the hydroxyl value is For example, a compound having 10 to 125 mg KOH / g and an average functional group number of 2 to 4, for example. The number average molecular weight of the polyol component can be calculated from the hydroxyl value of the polyol component (determined from JIS K1557-1 (2007)) and the average number of functional groups.

Examples of the high molecular weight polyol include polyether polyol, polyester polyol, and polycarbonate polyol.
Examples of the polyether polyol include polyoxy (2 to 3 carbon atoms) alkylene polyol and polytetramethylene ether glycol.
The polyoxy (2 to 3 carbon atoms) alkylene polyol is, for example, an addition polymer of alkylene oxide using a low molecular weight polyol or a low molecular weight polyamine as an initiator.

Examples of the alkylene oxide include propylene oxide and ethylene oxide. These alkylene oxides can be used alone or in combination of two or more. Preferably, propylene oxide and ethylene oxide are used in combination.
Moreover, as a catalyst for preparing a polyoxy (C2-C3) alkylene polyol, the catalyst is a phosphazenium compound described in Japanese Patent No. 3905638, for example. If a polyoxy (C2-C3) alkylene polyol is prepared using such a catalyst, a polyoxy (C2-C3) alkylene polyol with a small amount of monool by-products can be obtained.

  The low molecular weight polyol is a compound having two or more hydroxyl groups and a number average molecular weight of less than 60 to 400, for example, ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,3- Butanediol, 1,2-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, alkane (7-22) diol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, 1,3- or 1,4-cyclohexanedimethanol and mixtures thereof, 1,4-cyclohexanediol, alkane-1,2-diol (C17-20), hydrogenated bisphenol F, hydrogenated bisphenol A, 1,4 -Dihydroxy-2-butene p-xylylene glycol, bis (2-hydroxyethyl) terephthalate, bis (2-hydroxyethyl) isophthalate, 1,4-bis (2-hydroxyethoxy) benzene, 1,3-bis (2-hydroxyethoxy) benzene , Resorcin, hydroquinone, 2,2′-bis (4-hydroxycyclohexyl) propane, 2,6-dimethyl-1-octene-3,8-diol, 3,9-bis (1,1-dimethyl-2-hydroxy) Ethyl) -2,4,8,10-tetraoxaspiro [5,5] undecane, dihydric alcohols such as bisphenol F and bisphenol A, for example, trihydric alcohols such as glycerin and trimethylolpropane, such as tetramethylol methane , Pentaerythritol, dipentaerythritol, D-sorbite And polyhydric alcohols having four or more hydroxyl groups such as diol, xylitol, D-mannitol, D-mannitol and the like. Among these, Preferably, a trihydric alcohol is mentioned.

Examples of the low molecular weight polyamine include aliphatic diamines such as ethylenediamine, alkanolamines such as diethanolamine and triethanol, and aromatic diamines such as tolylenediamine.
As a polyoxy (C2-C3) alkylene polyol, Preferably, the polyethylene polypropylene polyol which copolymerized ethylene oxide at the molecular terminal is mentioned. In the polyethylene polypropylene polyol, the primary hydroxylation rate at the molecular terminals (ratio of primary hydroxyl groups to the total hydroxyl groups at the molecular terminals) is preferably 50 mol% or more, and more preferably 70 mol% or more. As long as the primary hydroxylation rate at the molecular terminals of the polyoxy (2 to 3 carbon atoms) alkylene polyol is not less than the above value, the reaction completion rate with the polyisocyanate can be improved even if the amount of the catalyst used is small.

In addition, the number average molecular weight of polyoxy (C2-C3) alkylene polyol becomes like this. Preferably, it is 200-8000, More preferably, it is 500-6000.
Examples of the polytetramethylene ether glycol include a ring-opening polymer obtained by cationic polymerization of tetrahydrofuran, and an amorphous (room temperature liquid) polytetramethylene ether glycol obtained by copolymerizing the above-described dihydric alcohol with a polymerization unit of tetrahydrofuran. Is mentioned.

In addition, the number average molecular weight of polytetramethylene ether glycol is preferably 250 to 8000, and more preferably 250 to 6000.
Examples of the polyester polyol include polycondensates obtained by reacting the above low molecular weight polyol with a polybasic acid or an alkyl ester thereof under known conditions.

  Examples of the polybasic acid include oxalic acid, malonic acid, succinic acid, methyl succinic acid, glutaric acid, adipic acid, 1,1-dimethyl-1,3-dicarboxypropane, and 3-methyl-3-ethylglutaric acid. , Azelaic acid, sebacic acid, other aliphatic dicarboxylic acids (carbon number 11-13), suberic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, octadecanedioic acid, nonadecanedioic acid Carboxylic acids such as acid, eicosane diacid, methylhexane diacid, citraconic acid, hydrogenated dimer acid, maleic acid, fumaric acid, itaconic acid, orthophthalic acid, isophthalic acid, terephthalic acid, toluene dicarboxylic acid, dimer acid and het acid And acid anhydrides, acid halides, ricinoleic acid derived from these carboxylic acids, 1 - such as hydroxy stearic acid.

  Specific examples of polycondensates of low molecular weight polyols and polybasic acids include poly (ethylene butylene adipate) polyol, poly (ethylene adipate) polyol, poly (ethylene propylene adipate) polyol, poly (propylene adipate) polyol, poly Examples thereof include adipate-based polyester polyols such as (butylene hexane adipate) polyol and poly (butylene adipate) polyol, and poly (alkylene phthalate) polyol.

Examples of the polyester polyol include castor oil polyol, or a modified castor oil polyol via an ester bond obtained by reacting castor oil polyol and polypropylene glycol.
Further, as the polyester polyol, for example, polycaprolactone polyol, polyvalerolactone polyol obtained by ring-opening polymerization of lactones such as ε-caprolactone and γ-valerolactone, using the above-described low molecular weight polyol as an initiator, Furthermore, the lactone type | system | group polyol which copolymerized said dihydric alcohol to them etc. are mentioned.

In addition, the number average molecular weight of the polyester polyol is preferably 500 to 8000, and more preferably 800 to 6000.
Examples of the polycarbonate polyol include a ring-opening polymer of ethylene carbonate using the above dihydric alcohol as an initiator, and examples thereof include 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 1 Polycarbonate diols obtained by condensation reaction of dihydric alcohols such as 1,6-hexanediol and carbonates such as dimethyl carbonate, diethyl carbonate and diphenyl carbonate, and amorphous (room temperature liquid) polycarbonate polyols.

The number average molecular weight of the polycarbonate polyol is preferably 500 to 8000, more preferably 800 to 6000.
These high molecular weight polyols can be used alone or in combination of two or more. Of these, preferred are polyether polyols having low viscosity and excellent fluidity, more preferred are polyoxy (carbon number 2-3) alkylene polyols, and particularly preferred are polyethylene polypropylene polyols. It is done.

In the present invention, as the polyol component, the low molecular weight polyol described above can be used in combination with the high molecular weight polyol, preferably a dihydric alcohol is used in combination, more preferably a butanediol is used in combination, and particularly preferably. 1,4-butanediol is used in combination.
In the polyol component, examples of dimethyltin dineodecanoate include known dimethyltin dineodecanoate, and examples of such commercially available products include UL-28 manufactured by GE Silicone.

Moreover, in a polyol component, well-known dibutyltin dimethyl maleate is mentioned as a dibutyltin dimethyl maleate, For example, Nitto Kasei Co., Ltd. SCAT-4L is mentioned as such a commercial item.
Further, the polyol component can contain a metal catalyst, an amine catalyst, and the like as a urethanization catalyst together with dimethyltin dineodecanoate and dibutyltin dimethyl maleate.

Examples of the metal catalyst include a tin catalyst and a bismuth metal catalyst.
Examples of tin-based catalysts include tin acetate, tin octoate, tin oleate, tin laurate, stannous octoate, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dimercaptide, dimethyltin dilaurate, and dioctyltin dimercaptide. Is mentioned.

Examples of the bismuth catalyst include bismuth octylate and bismuth neodecanoate.
Examples of the amine catalyst include diazabicycloundecene and diazabicycloundecene phenolate.
These metal catalysts and amine catalysts can be used alone or in combination of two or more.

  And the content of the urethanization catalyst (including dimethyltin dineodecanoate and dibutyltin dimethyl maleate) in the automobile interior material to be described later is, for example, 0.1 to 1.0% by mass, Preferably, it is 0.2-0.7 mass%. Moreover, the content ratio of the urethanization catalyst (including dimethyltin dineodecanoate and dibutyltin dimethyl maleate) with respect to the polyol component is, for example, 0.29-2. 9 parts by mass, preferably 0.58 to 2.0 parts by mass. When the content (content ratio) of the urethanization catalyst is in the above range, the demolding time during the reaction injection molding can be shortened.

  Further, among the urethanization catalyst, the content of dimethyltin dineodecanoate is, for example, 0.05 to 0.4% by mass, preferably 0.1 to 0.4% by mass in the automobile interior material described later. It is. Moreover, the content rate of the dimethyltin dineodecanoate with respect to a polyol is 0.14-1.15 mass parts with respect to 100 mass parts of polyols, Preferably, it is 0.29-1.15 mass parts. If the content (content ratio) of dimethyltin dineodecanoate is in the above range, the fogging property of the automobile interior material can be reduced.

  Further, in the urethanization catalyst, the content of dibutyltin dimethyl maleate is, for example, 0.05 to 0.6% by mass, preferably 0.1 to 0.6% by mass in the automobile interior material described later. is there. Moreover, the content rate of the dibutyltin dimethyl maleate with respect to a polyol is 0.14-1.73 mass parts with respect to 100 mass parts of polyols, Preferably, it is 0.29-1.73 mass parts. If the (content) content ratio of dibutyltin dimethyl maleate is in the above range, the long-term heat resistance of the automobile interior material can be improved.

  And in order to prepare a polyol component, first, each said component (namely, a polyol, a dimethyltin dineodecanoate, and a dibutyltin dimethyl maleate) is mix | blended as an essential component, for example, 70- The mixture is stirred and mixed at 120 ° C, preferably 80 to 110 ° C. Subsequently, it deaerates and it cools, for example to 20-70 degreeC, Preferably it is 20-60 degreeC. Thereby, a polyol component can be prepared.

And in the manufacturing method of the automotive interior material of this invention, the said isocyanate component prepared separately or prepared and the said polyol component are reaction-injection-molded.
The automobile interior material can be molded by a known reaction injection molding apparatus. The known reaction injection molding apparatus includes, for example, a first supply tank (1) for supplying an isocyanate component, a second supply tank (2) for supplying a polyol component, and an isocyanate component and a polyol component. And a mixing head (3) for injecting the mixture into a mold and an automobile interior material mold (4).

  Specifically, first, the isocyanate component is supplied from the first supply tank (1), and the polyol component is supplied from the second supply tank (2) to the mixing head (3). At this time, the raw material temperature of the isocyanate component is adjusted to 35 to 55 ° C., for example. On the other hand, the raw material temperature of a polyol component is adjusted to 35-55 degreeC, for example. Moreover, the index (INDEX) which represented the molar ratio of the isocyanate group of the isocyanate component with respect to the hydroxyl group of a polyol component in the percentage at the time of mixing is 80-120, for example, Preferably, it sets to 95-105.

  Next, with the mixing head (3), the isocyanate component and the polyol component are stirred and mixed, and injected into the automobile interior material mold (4) at an injection speed of, for example, 100 to 2500 g / sec. Moreover, the metal mold | die (4) for motor vehicle interior materials is previously pressed by 10-30 Mpa (press pressure), for example, and is heated to 60-80 degreeC, for example. Furthermore, if necessary, a release agent such as a solvent-based or water-based wax emulsion is applied to the molding surface of the automobile interior material mold (4) in order to improve the demoldability of the molded product.

Then, after the isocyanate component and the polyol component are injected into the automobile interior material mold (4), for example, the isocyanate component and the polyol component are polymerized in the automobile interior material mold (4) for 1 to 3 minutes. Thereafter, the mold for automobile interior material (4) is cooled and decompressed until it reaches room temperature and normal pressure, and the molded product is removed from the mold for automobile interior material (4) to obtain an automobile interior material.
In the present invention, additives such as an ultraviolet absorber, an antioxidant, a multifunctional stabilizer, and a pigment can be added to one or both of the isocyanate component and the polyol component, if necessary. These additives are added in advance to the isocyanate component and / or the polyol component. Preferably, it is added to the polyol component.

  Examples of UV absorbers include benzophenone UV absorbers, benzotriazole UV absorbers, hindered amine UV absorbers, salicylate UV absorbers, cyanoacrylate UV absorbers, acrylonitrile UV absorbers, and nickel or cobalt. Examples thereof include complex salt ultraviolet absorbers. Ultraviolet absorbers can be used alone or in combination of two or more. Among these, Preferably, a benzotriazole type ultraviolet absorber and a hindered amine type ultraviolet absorber are mentioned. Moreover, an ultraviolet absorber is added in the ratio used as 0.1-1.0 mass%, for example, Preferably, it is 0.3-0.7 mass%, for example in a motor vehicle interior material.

  Examples of the antioxidant include hindered phenol stabilizers, amine stabilizers, phosphorus stabilizers, sulfur stabilizers and the like. Antioxidants can be used alone or in combination of two or more. Of these, a hindered phenol stabilizer is preferable. Further, the antioxidant is added to the automobile interior material at a rate of 0.1 to 1.0% by mass, preferably 0.3 to 0.7% by mass.

  The multifunctional stabilizer is, for example, a stabilizer having both an ultraviolet absorption function and an antioxidant function, and specific examples of such a stabilizer include benzotriazolyl-alkylbisphenol compounds. . Further, the multifunctional stabilizer is added to the automobile interior material at a rate of 0.1 to 1.0% by mass, preferably 0.3 to 0.7% by mass.

Examples of the pigment include carbon black, titanium oxide, and iron oxide. These can be used alone or in combination of two or more. In addition, the pigment is added to the automobile interior material at a rate of 0.1 to 1.0% by mass, preferably 1.0 to 7.0% by mass.
Furthermore, a chain extender, a crosslinking agent, a flame retardant, a pigment dispersant (wet dispersant), a foam stabilizer, an antifoaming agent, etc. may be added to the isocyanate component and / or the polyol component depending on the application. it can.

The automotive interior material obtained as described above is excellent in long-term heat resistance and fogging properties.
Specifically, this automobile interior material was measured in accordance with a vulcanized rubber test method described in JIS K6301 (1969) after performing a durability test at 110 ° C. for 1000 hours, for long-term heat resistance. The hardness (the hardness Shore-A after the durability test) is 85% or more, preferably 90% or more of the initial hardness (Shore-A).

  In addition, this automotive interior material is a glass whose temperature is adjusted to 40 ° C. in an upper opening of a test sample set in a glass container heated to 100 ° C. using a device conforming to the ISO 6452 standard for fogging properties. The glass plate after setting the plate and performing the fogging test for 20 hours (HAZE) is, for example, 15 or less, and preferably 10 or less.

Thus, according to the manufacturing method of the present invention, an automobile interior material excellent in long-term heat resistance and fogging property can be molded with a mold at a low temperature (for example, 60 to 75 ° C.) with good demolding property.
Therefore, this automobile interior material can be used for an automobile interior material such as a dashboard, a door trim, and an instrument panel of an automobile.

Next, although this invention is demonstrated based on an Example and a comparative example, this invention is not limited by the following Example. In the following description, “part” and “%” are based on mass unless otherwise specified.
<Raw material>
The following raw materials were used.
1,3-BIC (1)
1,3-bis (isocyanatomethyl) cyclohexane (Takenate 600 manufactured by Mitsui Chemicals Polyurethanes)
HDI trimmer (2)
Hexamethylene diisocyanate trimer (Takenate D170N manufactured by Mitsui Chemicals Polyurethanes)
Polyether polyol (3)
A polyether polyol having an average number of functional groups of 3 and a hydroxyl value of 24 mgKOH / g, obtained by addition polymerization of propylene oxide to glycerin and then addition polymerization of ethylene oxide.

In addition, propylene oxide and ethylene oxide copolymerized ethylene oxide at the molecular terminal in a weight ratio of propylene oxide / ethylene oxide = 86/14 to glycerin.
1,4-BD (4)
1,4-butanediol (Mitsubishi Chemical Corporation 1,4-BG)
UV absorber (5)
Sankyo Lifetech Co., Ltd. Sanol LS770 (hindered amine UV absorber)
Antioxidant (6)
IRGANOX1035 (Hindered phenol antioxidant) manufactured by Ciba Specialty Chemicals
Multifunctional stabilizer (7)
JAST-500 (benzotriazole stabilizer) manufactured by Johoku Chemical Industry Co., Ltd.
Urethane catalyst (8)
Dimethyltin dineodecanoate (GE Silicone UL-28)
Urethane catalyst (9)
Dibutyltin dimethyl maleate (SCAT-4L manufactured by Nitto Kasei Co., Ltd.)
Pigment (10)
Carbon black (manufactured by Dainichi Seika)
Example 1
(A) Preparation of isocyanate component 70 parts by mass of 1,3-BIC (1) and 30 parts by mass of HDI trimer (2) were charged into a reactor, and the mixture was stirred and mixed and degassed. Thereby, the isocyanate component was obtained.
(B) Preparation of polyol component 100 parts by mass of polyether polyol (4) is charged into a reactor, and further, 0.5 part by mass of UV absorber (5) and 0.5 part by mass of antioxidant (6) Then, 0.5 part by mass of the multifunctional stabilizer (7) was added and dissolved at 90 ° C. Next, 50 parts by mass of 1,4-BD (4), 0.5 parts by mass of the urethanization catalyst (8) (0.17% by mass in the molded product), 1.5 parts by mass of the urethanization catalyst (9) ( 0.52% by mass in the molded product) was added, stirred, mixed and degassed. And the polyol component was obtained by cooling at 60 degreeC.
(C) Molding of molded product The isocyanate component obtained in (A) and the polyol component obtained in (B) have an isocyanate component / polyol component mixing ratio of 84.75 / 100. The mixture was mixed in a mixing head of a two-component high-pressure foaming machine fixed to a mold, injected into a mold for automobile interior material from a gate, and demolded after 70 seconds to obtain a molded product. Table 1 shows the compounding ratio of the isocyanate component and the polyol component, and INDEX.

The molding conditions are as follows. In addition, a mold release agent of an aqueous wax emulsion was applied in advance to the molding surface of the automobile interior material mold.
Injection speed: 400g / sec
Isocyanate component raw material temperature: 45 ° C
Raw material temperature of polyol component: 45 ° C
Mold size: 460 × 380 × 1mm
Mold temperature: 70 ℃
Example 2
1.0 part by mass (0.35% by mass in the molded product) of the urethanization catalyst (8) is added to 100 parts by mass of the polyether polyol (4), and the urethanization catalyst (9) is added to the polyether polyol ( 4) A molded product was obtained under the same conditions and operation as in Example 1 except that 1.0 part by mass (0.35% by mass in the molded product) was added to 100 parts by mass. Table 1 shows the compounding ratio of the isocyanate component and the polyol component, and INDEX.
Comparative Example 1
The urethanization catalyst (8) was used in an amount of 2.0 parts by mass (0.69% by mass in the molded product) with respect to 100 parts by mass of the polyether polyol (4), and the urethanization catalyst (9) was not used. A molded product was obtained under the same conditions and operation as in Example 1. Table 1 shows the compounding ratio of the isocyanate component and the polyol component, and INDEX.
Comparative Example 2
Except that the urethanization catalyst (9) was used in an amount of 2.0 parts by mass (0.69% by mass in the molded product) with respect to 100 parts by mass of the polyether polyol (4), and the urethanization catalyst (8) was not used. A molded product was obtained under the same conditions and operation as in Example 1. Table 1 shows the compounding ratio of the isocyanate component and the polyol component, and INDEX.

Evaluation of physical properties The physical properties of the molded products obtained in the respective Examples and Comparative Examples (hereinafter abbreviated as “molded products”) were evaluated by the following methods. The results are shown in Table 1.
<Hardness (Shore-A)>
Based on the vulcanized rubber test method described in JIS K6301 (1969), the initial hardness (Shore-A) of the test sample of each molded article was measured. Next, the test sample was subjected to a durability test at 110 ° C. for 1000 hours, and then the hardness (Shore-A) was measured in the same manner as described above.
<Foging properties>
Using a device conforming to the ISO 6452 standard, set the test sample of the molded product in a glass container heated to 100 ° C, set a glass plate adjusted to 40 ° C in the upper opening, and perform a 20 hour fogging test. Carried out. Next, the glass haze (HAZE) of the glass plate after the test was measured using NDH-5000 manufactured by Nippon Denshoku Industries Co., Ltd.

Claims (2)

An isocyanate component containing 1,3-bis (isocyanatomethyl) cyclohexane and a trimer of hexamethylene diisocyanate;
A method for producing an automotive interior material, comprising: reaction injection molding a polyol, a polyol component containing dimethyltin dineodecanoate and dibutyltin dimethyl maleate.   It is characterized by obtaining an automobile interior material containing 0.05 to 0.4% by mass of dimethyltin dineodecanoate and 0.05 to 0.6% by mass of dibutyltin dimethyl maleate. The method for manufacturing an automobile interior material according to claim 1.