JP2013124259A - Method of producing molded foam with different hardness - Google Patents

Method of producing molded foam with different hardness Download PDF

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JP2013124259A
JP2013124259A JP2011272097A JP2011272097A JP2013124259A JP 2013124259 A JP2013124259 A JP 2013124259A JP 2011272097 A JP2011272097 A JP 2011272097A JP 2011272097 A JP2011272097 A JP 2011272097A JP 2013124259 A JP2013124259 A JP 2013124259A
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different hardness
foam
hardness
isocyanate
mold
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JP6214129B2 (en
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Tomotaka Yamanoi
智隆 山野井
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Toyo Quality One Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a simple method of producing a molded foam with different hardness capable of setting physical properties over a wide range and maintaining flame retardancy.SOLUTION: In the method of producing a molded foam having portions having different hardnesses, two kinds of foaming mixture liquids obtained by mixing at least one kind of polyol component and two kinds of isocyanate components individually are separately poured into a die from the same mixing head, and then, integrally foam-molded.

Description

本発明は、鉄道車両や自動車、航空機用に使用される異硬度モールドフォームの製造方法に関する。   TECHNICAL FIELD The present invention relates to a method for producing a different hardness mold foam used for railway vehicles, automobiles, and aircraft.

軟質ウレタンフォームは、そのクッション性から鉄道車両や自動車等に用いられており、座る者への快適性が求められている。例えば、シートクッションは、長時間座ることを考慮し、シートの両脇（両サイド部）が凸状に形成され身体の横への動きを防ぐ役割を有している。また、両サイド部より内側の身体が当たる部分（中央部）は柔らかく、両サイド部は固くなっている異硬度モールドフォームが知られている。これは身体のぶれをより防止するためと、例えば鉄道車両用シートでは人がよく掴むことでのヘタリを防止するためである。   Soft urethane foam is used for railway vehicles, automobiles, and the like because of its cushioning properties, and is required to be comfortable for the seated person. For example, in consideration of sitting for a long time, the seat cushion has a role of preventing the lateral movement of the body by forming both sides (both side portions) of the seat in a convex shape. Further, a different hardness mold foam is known in which a portion (center portion) where the body hits the inner side from both side portions is soft and both side portions are hard. This is to prevent the body from shaking and to prevent settling caused by a person's well grasping, for example, in a railcar seat.

従来、身体のぶれやヘタリを防止するため、硬さを出したい部分に金属フレーム内蔵や板状スラブの貼付け等を施す方法が知られている。しかし、これは作業工数が多く、金属フレームがずれてしまった場合の修理等に多くの労力と時間を費やしていた。また、特許文献１のように、ソフト用注入ヘッドとハード用注入ヘッドの２つのミキシングヘッドを使用し、硬度の異なる部位に夫々トリレンジイソシアネート（ＴＤＩ）のＩｎｄｅｘと、水部数及び触媒の部数が異なる発泡混合液を吐出し一体発泡成型する方法も知られている。しかし、この場合、硬度の変化幅は最高で１７と狭く、広い変化幅が望まれていた。   Conventionally, in order to prevent shaking and settling of the body, a method of applying a built-in metal frame or attaching a plate-like slab to a portion to be hardened is known. However, this requires a lot of work and a lot of work and time for repairs when the metal frame is displaced. In addition, as in Patent Document 1, two mixing heads, a soft injection head and a hard injection head, are used. There is also known a method in which different foaming liquid mixtures are discharged and integrally foamed. However, in this case, the change width of the hardness is as narrow as 17 at the maximum, and a wide change width is desired.

特許文献２や特許文献３には、原料を多様に用いて異硬度モールドフォームを得ることが開示されている。しかし、特許文献２，３の場合、原料の調整が煩雑であり、ポリオールが変わることで難燃性も変化してしまうため鉄道車両のような高い難燃性を要求されるものについては適していない。そのため、得られた異硬度モールドフォーム全体の難燃性を保証するには更に原料調整する等の対策が必要であった。   Patent Literature 2 and Patent Literature 3 disclose that different hardness molded foams are obtained using various raw materials. However, in the case of Patent Documents 2 and 3, the adjustment of the raw materials is complicated, and the flame retardancy also changes due to the change of the polyol, so that it is suitable for those requiring high flame retardancy such as a railway vehicle. Absent. For this reason, in order to guarantee the flame retardancy of the whole molded foam having different hardness, further measures such as adjustment of raw materials are required.

また、近年では要求される異硬度モールドフォームの物性、主に密度，硬度，反発弾性率が広範囲であるため、上記方法で得られるフォームでは対応するのに限界があった。   Further, in recent years, the required physical properties of different hardness mold foams, mainly density, hardness, and impact resilience, are in a wide range. Therefore, foams obtained by the above method have a limit to cope with them.

特開昭６２−２４００９１号公報JP-A-62-240091 特開平０９−１３６９４０号公報JP 09-136940 A 特開２００２−２１２２５４号公報JP 2002-212254 A

本発明はこうしたことを考慮してなされたもので、物性の広範囲設定が可能となるとともに、難燃性を保持し得る異硬度モールドフォームを簡易方法で得られる異硬度モールドフォームの製造方法を提供することを目的とする。   The present invention has been made in view of the above, and provides a method for producing a different hardness mold foam that enables a wide range of physical properties to be set and a different hardness mold foam that can maintain flame retardancy by a simple method. The purpose is to do.

本発明の異硬度モールドフォームの製造方法は、硬度の異なる部位を有する異硬度モールドフォームを製造する方法において、少なくとも１種類のポリオール成分と２種類のイソシアネート成分を夫々混合させて得られる２種類の発泡混合液を、同一のミキシングヘッドから金型内に別々に注入した後、一体発泡成型させることを特徴とする。   The method for producing a different hardness mold foam of the present invention is a method for producing a different hardness mold foam having parts with different hardnesses, and is obtained by mixing at least one polyol component and two isocyanate components, respectively. The foamed mixed liquid is separately injected into the mold from the same mixing head, and then integrally foamed.

本発明によれば、イソシアネート成分のみを変更するだけで従来よりも物性の広範囲設定が可能であるともに、難燃性を保持しえる異硬度モールドフォームを簡易方法で得ることができる。   According to the present invention, it is possible to obtain a different hardness mold foam which can set a wider range of physical properties than before and can maintain flame retardancy by simply changing only the isocyanate component.

本発明に係る異硬度モールドフォーム及び成型金型の説明図。Explanatory drawing of the different hardness mold foam and molding die concerning this invention. 本発明に係るミキシングヘッドに対するポリオール成分及びイソシアネート成分の供給例を示す説明図。Explanatory drawing which shows the example of supply of the polyol component and isocyanate component with respect to the mixing head which concerns on this invention.

以下、本発明に係る異硬度モールドフォームの製造方法について説明する。
本発明において、異硬度とは、一つのフォーム中に硬度の異なる部位が存在することを意味する。本発明の異硬度モールドフォームは、少なくとも１種類のポリオール成分と２種類のイソシアネート成分を夫々混合して得られる２種類の発泡混合液を、同一のミキシングヘッドから成型金型内に別々に吐出し、一体発泡成型させることにより得られる。 Hereinafter, the manufacturing method of the different hardness mold foam which concerns on this invention is demonstrated.
In the present invention, the different hardness means that there are parts having different hardness in one foam. The different hardness mold foam of the present invention separately discharges two types of foaming mixture obtained by mixing at least one type of polyol component and two types of isocyanate component from the same mixing head into the molding die. , Obtained by integral foam molding.

本発明において、ポリオール成分は後述する第１および第２のイソシアネート成分以外の原料と既に混合されている。ポリオールとしては、ＨＲモールド向けに使用されるポリオール及びポリマーポリオールを使用することができる。ここで、第１のイソシアネート成分はメチレンジイソシアネート（ＭＤＩ）０〜３０％およびトリレンジイソシアネート（ＴＤＩ）７０〜１００％を含み、第２のイソシアネート成分はＭＤＩ ７０〜１００％およびＴＤＩ ０〜３０％を含むことが好ましい。   In the present invention, the polyol component is already mixed with raw materials other than the first and second isocyanate components described later. As the polyol, polyols and polymer polyols used for HR molds can be used. Here, the first isocyanate component comprises methylene diisocyanate (MDI) 0-30% and tolylene diisocyanate (TDI) 70-100%, and the second isocyanate component comprises MDI 70-100% and TDI 0-30%. It is preferable to include.

本発明において、発泡剤は化学的発泡剤を用いることが好ましく、水を用いるのが好ましい。水はイソシアネート成分と反応し、反応ガスを発生することでウレタン樹脂を発泡させる。
本発明において、触媒としては、従来公知の触媒が特に制限なく使用可能である。例えば、トリエチレンジアミン、ビス（ジメチルアミノエチル）エーテル、ジブチルチンラウレートなどが使用でき、これらは単独でも組み合わせて使用してもよい。 In the present invention, a chemical foaming agent is preferably used as the foaming agent, and water is preferably used. Water reacts with the isocyanate component and generates a reaction gas to foam the urethane resin.
In the present invention, a conventionally known catalyst can be used without particular limitation as the catalyst. For example, triethylenediamine, bis (dimethylaminoethyl) ether, dibutyltin laurate and the like can be used, and these may be used alone or in combination.

本発明において、シリコーン系の整泡剤を使用することが好ましい。また、本発明において、架橋剤、添加剤などを本発明の目的に影響を与えない範囲で用いてもよい。特に、鉄道車両用や航空機用クッション体においてはメラミン系やハロゲン系などの難燃剤を使用してもよい。   In the present invention, it is preferable to use a silicone-based foam stabilizer. Moreover, in this invention, you may use a crosslinking agent, an additive, etc. in the range which does not affect the objective of this invention. In particular, flame retardants such as melamine type and halogen type may be used in railcar and aircraft cushion bodies.

次に、両サイド部の硬度が中央部の硬度よりも高い自動車用シートクッションに使用される異硬度モールドフォームを製造する場合について図１及び図２を参照して説明する。ここで、図１は異硬度モールドフォームや成型金型の説明図、図２はミキシングヘッドに対するポリオール成分及びイソシアネート成分の供給例を示す説明図を示す。   Next, a case of producing a different hardness mold foam used for an automobile seat cushion in which the hardness of both side portions is higher than the hardness of the central portion will be described with reference to FIGS. Here, FIG. 1 is an explanatory view of a mold having a different hardness and a molding die, and FIG. 2 is an explanatory view showing an example of supplying a polyol component and an isocyanate component to a mixing head.

図１中の符号１は、身体の主要部が当たる中央部２と、この中央部２より硬度が高い凸状のサイド部３とから構成された異硬度モールドフォームを示す。また、図中の符号４は、適温に調節された下金型５及び上金型６を備えた成型金型を示す。   Reference numeral 1 in FIG. 1 indicates a different hardness mold foam composed of a central portion 2 where a main body part hits and a convex side portion 3 having a higher hardness than the central portion 2. Moreover, the code | symbol 4 in a figure shows the shaping | molding die provided with the lower die 5 and the upper die 6 which were adjusted to appropriate temperature.

図２中の符号１１は、６つの原料供給口１２ａ，１２ｂ，１２ｃ，１２ｄ，１２ｅ，１２ｆを備えたミキシングヘッドを示す。ここで、原料供給口１２ａ〜１２ｄはポリオール成分Ａ〜Ｄ用のものであり、原料供給口１２ｅ，１２ｆは後述するイソシアネート成分Ａ，Ｂ用のものである。なお、従来の２液混合タイプでは、異なる発泡液毎のミキシングヘッドが必要となり、場所と費用が必要となる。   Reference numeral 11 in FIG. 2 indicates a mixing head having six raw material supply ports 12a, 12b, 12c, 12d, 12e, and 12f. Here, the raw material supply ports 12a to 12d are for polyol components A to D, and the raw material supply ports 12e and 12f are for isocyanate components A and B described later. In the conventional two-liquid mixing type, a mixing head for each different foaming liquid is required, and a place and cost are required.

まず、上金型６が開いた状態で、所定のポリオール成分（例えばポリオール成分Ａ）とイソシアネート成分（例えばイソシアネート成分Ａ）を混合させて得られる第１の発泡混合液を、図１の成型金型４の下金型５の中央部分５ａに吐出する。次に、ポリオール成分Ａとイソシアネート成分Ｂを混合させて得られる第２の発泡混合液を、連続して下金型５の凹部５ｂに迅速に吐出する。つづいて、上金型６を閉じ、一体発泡成型させて異硬度モールドフォーム１を製造する。なお、下金型の中央部分、凹部に対する発泡混合液の吐出順番やミキシングヘッドの動作軌道は適宜設定することができる。   First, a first foaming mixture obtained by mixing a predetermined polyol component (for example, polyol component A) and an isocyanate component (for example, isocyanate component A) in a state where the upper mold 6 is opened is used as a molding metal in FIG. It discharges to the center part 5a of the lower mold 5 of the mold 4. Next, the second foaming mixture obtained by mixing the polyol component A and the isocyanate component B is rapidly discharged into the recess 5 b of the lower mold 5 continuously. Subsequently, the upper mold 6 is closed and integrally foamed to produce the different hardness mold foam 1. In addition, the discharge order of the foaming liquid mixture with respect to the center part of a lower metal mold | die, a recessed part, and the operation | movement trajectory of a mixing head can be set suitably.

次に、本発明の具体的な実施例及び比較例について説明する。
（実施例）
図１の異硬度モールドフォームは、成型金型や図２のミキシングヘッドを用いて次のように製造する。但し、本実施例は次に述べる例に限定されない。また、本実施例ではポリオール成分Ａとイソシアネート成分Ａ，Ｂを夫々反応させる場合について述べる。 Next, specific examples and comparative examples of the present invention will be described.
(Example)
The different hardness mold foam of FIG. 1 is manufactured as follows using a molding die and the mixing head of FIG. However, the present embodiment is not limited to the following example. In this example, the case where the polyol component A and the isocyanate components A and B are reacted is described.

（ポリオール成分Ａ）
ポリオール：水酸基価２８、官能基数３のポリエーテルポリオール
ポリマーポリオール：水酸基価２８、官能基数３のポリエーテルポリオール
発泡剤：水
触媒１：ＴＥＤＡ（トリエチレンジアミン）
触媒２：ＤＭＡＥＥ（ジメチルアミノエチルエーテル）
発泡剤：シリコーン系
連通化剤：水酸基価５１のポリエーテルポリオール
架橋剤：水酸基価８４０のポリエーテルポリオール
（イソシアネート成分Ａ）：ＭＤＩ２０％およびＴＤＩ８０％を含むポリイソシアネート
（イソシアネート成分Ｂ）：ＭＤＩ７３％およびＴＤＩ２７％を含むポリイソシアネート。 (Polyol component A)
Polyol: A polyether polyol having a hydroxyl value of 28 and a functional group number of 3.
Polymer polyol: a polyether polyol having a hydroxyl value of 28 and a functional group number of 3
Foaming agent: water
Catalyst 1: TEDA (triethylenediamine)
Catalyst 2: DMAEE (dimethylaminoethyl ether)
Foaming agent: silicone
Communicating agent: polyether polyol having a hydroxyl value of 51
Cross-linking agent: polyether polyol having a hydroxyl value of 840
(Isocyanate component A): polyisocyanate containing 20% MDI and 80% TDI
(Isocyanate component B): Polyisocyanate containing 73% MDI and 27% TDI.

次に、異硬度モールドフォームの製造方法について説明する。なお、ポリオール成分Ａとイソシアネート成分Ａの混合液（第１の発泡混合液），ポリオール成分Ａとイソシアネート成分Ｂの混合液（第２の発泡混合液）の２種類の発泡混合液は、下記表１のように配合する。ここで、表１には、Ｉｎｄｅｘ，コア密度，硬度，反発弾性率，及び湿熱圧縮残留歪率も開示した。つづいて、第１の発泡混合液を、ミキシングヘッド１１から成型金型４の下金型５の中央部５ａに吐出する。ひきつづき、第２の発泡混合液を、同一のミキシングヘッド１１から連続して下金型５の凹部５ｂに迅速に吐出する。この後、上金型６を閉じ、一体発泡成型させて異硬度モールドフォーム１を製造する。   Next, the manufacturing method of a different hardness mold foam is demonstrated. In addition, two types of foaming liquid mixture, a mixed liquid of polyol component A and isocyanate component A (first foaming liquid mixture), and a mixed liquid of polyol component A and isocyanate component B (second foaming liquid mixture) are shown in the following table. Mix as in 1. Here, Table 1 also discloses Index, core density, hardness, impact resilience, and wet heat compression residual strain. Subsequently, the first foamed mixed liquid is discharged from the mixing head 11 to the central part 5 a of the lower mold 5 of the molding mold 4. Subsequently, the second foamed mixed liquid is rapidly discharged from the same mixing head 11 to the concave portion 5 b of the lower mold 5. Thereafter, the upper mold 6 is closed and integrally foamed to produce the different hardness mold foam 1.

（比較例）
下記表１のように配合されたポリオール成分Ａを使用し、Ｉｎｄｅｘのみを変えた２種類のア発泡原液を同一ミキシングヘッドから連続して成型金型の下金型内に吐出し、異硬度モールドフォームを成型した。この時、Ｉｎｄｅｘ９０の第１の発泡混合液を下金型５の中央部５ａへ吐出し、Ｉｎｄｅｘ１００の第２の発泡混合液を下金型５の凹部５ｂへ連続吐出した。 (Comparative example)
Using the polyol component A blended as shown in Table 1 below, two types of a foaming stock solution with only the index changed are continuously discharged from the same mixing head into the lower mold of the mold, and the different hardness mold Formed a foam. At this time, the first foamed mixed liquid of Index 90 was discharged to the central part 5 a of the lower mold 5, and the second foamed mixed liquid of Index 100 was continuously discharged to the concave part 5 b of the lower mold 5.

なお、上記Ｉｎｄｅｘとは、ポリオール成分中の全活性水酸基に対するポリイソシアネート化合物中のイソシアネート基の当量比（イソシアネート基／活性水酸基）を示す。ここで、全てのポリオールと水（活性水酸基）が、イソシアネート（イソシアネート基）と反応した場合、Ｉｎｄｅｘ＝１００となる。また、Ｉｎｄｅｘが高いとイソシアネート基が活性水酸基よりも多い。   In addition, said Index shows the equivalent ratio (isocyanate group / active hydroxyl group) of the isocyanate group in a polyisocyanate compound with respect to all the active hydroxyl groups in a polyol component. Here, when all polyols and water (active hydroxyl group) react with isocyanate (isocyanate group), Index = 100. Moreover, when Index is high, there are more isocyanate groups than active hydroxyl groups.

表１の各物性は下記のとおり測定した。
コア密度（ｋｇ／ｍ３）：ＪＩＳ Ｋ−６４００−１：２００４による。
硬度（Ｎ／３１４ｃｍ２）：ＪＩＳ Ｋ−６４００−２のＤ法：２００４による。
反発弾性率（％）：ＪＩＳ Ｋ−６４００−３：２０１１による。
湿熱残留歪率（％）：ＪＩＳ Ｋ−６４００−４：２００４による。

Figure 2013124259
Each physical property of Table 1 was measured as follows.
Core density (kg / m 3 ): According to JIS K-6400-1: 2004.
Hardness (N / 314 cm 2 ): According to JIS K-6400-2, Method D: 2004.
Rebound resilience (%): According to JIS K-6400-3: 2011.
Wet heat residual strain ratio (%): According to JIS K-6400-4: 2004.
Figure 2013124259

比較例では硬度１１７．５Ｎ／３１４ｃｍ２の部分と硬度１３６．８Ｎ／３１４ｃｍ２の部分が得られるにすぎない。これに対し、実施例では、２種類の発泡混合液ともＩｎｄｅｘ９０で、硬度１１８．７Ｎ／３１４ｃｍ２の部分と硬度２８８．３Ｎ／３１４ｃｍ２の部分が得られる。２種類の発泡混合液のＩｎｄｅｘが異なれば、さらに広い物性範囲が得られる。また、ミキシングヘッドのポリオール成分用の原料供給口１２ｂ〜１２ｄに、ポリオール成分Ａとイソシアネート成分Ａ及びＢから得られる異硬度以外の範囲が得られるように配合したポリオール成分を各々用いることができる。このことから、ひとつのフォーム中に設定できる物性範囲は、実施例の方が広範囲であることが分かる。さらに、得られる異硬度フォームの種類も、従来の製造方法よりも増加することができる。 Only partial and hardness 136.8N / 314cm 2 parts hardness 117.5N / 314cm 2 is obtained in the comparative example. In contrast, in the embodiment, 2 kinds of the foaming mixture with Index90, hardness 118.7N / 314cm 2 parts and hardness 288.3N / 314cm 2 parts is obtained. If the indexes of the two types of foaming mixture are different, a wider physical property range can be obtained. Moreover, the polyol component mix | blended so that the ranges other than the different hardness obtained from the polyol component A and the isocyanate components A and B can be respectively used for the raw material supply ports 12b-12d for the polyol component of a mixing head. From this, it can be seen that the range of physical properties that can be set in one form is wider in the example. Furthermore, the types of different hardness foams obtained can also be increased over conventional manufacturing methods.

表２は、イソシアネート成分Ａ，Ｂを夫々用いた際に得られるフォームのコア密度，硬度，反発弾性率，及び湿熱圧縮残留歪率を示す。

Figure 2013124259
Table 2 shows the core density, hardness, impact resilience, and wet heat compression residual strain of the foam obtained when isocyanate components A and B are used, respectively.
Figure 2013124259

ポリオール成分Ａとイソシアネート成分Ａ、ポリオール成分Ａとイソシアネート成分Ｂ夫々から得られる発泡混合液で設定できる各物性範囲を示しており、Ｉｎｄｅｘは９０〜１０５までの調整を行っている。例えば、高硬度部と低硬度部の硬度差を最大にした異硬度フォームを得る場合は、ポリオール成分Ａとイソシアネート成分Ａからなる硬度１１５Ｎ／３１４ｃｍ２のフォームと、ポリオール成分Ａとイソシアネート成分Ｂからなる硬度５７０Ｎ／３１４ｃｍ２のフォームを一体発泡成型することができる。 Each physical property range that can be set by the foamed mixed liquid obtained from each of the polyol component A and the isocyanate component A, and the polyol component A and the isocyanate component B is shown, and Index is adjusted from 90 to 105. For example, when obtaining a different hardness foam in which the hardness difference between the high hardness part and the low hardness part is maximized, a foam having a hardness of 115 N / 314 cm 2 composed of polyol component A and isocyanate component A, and polyol component A and isocyanate component B are used. The foam having a hardness of 570 N / 314 cm 2 can be integrally foamed.

上記実施例では、１種類のポリオール成分を使用した場合について述べたが、４種類のポリオール成分Ａ〜Ｄを使用した場合には、密度２５〜１２０ｋｇ／ｍ３かつ硬度８０〜４００Ｎの広範囲の物性を適宜組み合わせることができることが判明した。 In the above embodiment, the case where one kind of polyol component is used has been described. However, when four kinds of polyol components A to D are used, a wide range of physical properties of density 25 to 120 kg / m 3 and hardness 80 to 400 N are used. It was found that can be combined as appropriate.

なお、本発明は、上記実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化できる。また、上記実施形態に開示されている複数の構成要素の適宜な組み合せにより種々の発明を形成できる。例えば、実施形態に示される全構成要素から幾つかの構成要素を削除してもよい。更に、異なる実施形態に亘る構成要素を適宜組み合わせてもよい。   Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

本発明の異硬度モールドフォームは、両サイド部の硬度が高く、サポート性が良好な自動車用シートクッション材に利用できる。また、難燃性を保持したまま異硬度モールドフォームが得られるため、難燃性が特に重要視される鉄道車両や航空機のクッション材に適している。   The different hardness mold foam of the present invention can be used for an automotive seat cushion material having high hardness on both side portions and good supportability. In addition, since a molded foam having a different hardness can be obtained while maintaining flame retardancy, it is suitable for a cushion material for railway vehicles and aircraft in which flame retardancy is particularly important.

１…成型金型、２…中央部、３…サイド部、４…成型金型、５…下金型、６…上金型、１１…ミキシングヘッド、１２ａ〜１２ｆ…原料供給口。   DESCRIPTION OF SYMBOLS 1 ... Molding die, 2 ... Center part, 3 ... Side part, 4 ... Molding die, 5 ... Lower die, 6 ... Upper die, 11 ... Mixing head, 12a-12f ... Raw material supply port.

Claims (3)

硬度の異なる部位を有する異硬度モールドフォームを製造する方法において、
少なくとも１種類のポリオール成分と２種類のイソシアネート成分を夫々混合させて得られる２種類の発泡混合液を、同一のミキシングヘッドから金型内に別々に注入した後、一体発泡成型させることを特徴とする異硬度モールドフォームの製造方法。 In a method for producing a different hardness mold foam having different hardness parts,
Two types of foaming mixed liquids obtained by mixing at least one kind of polyol component and two kinds of isocyanate components are separately injected from the same mixing head into a mold and then integrally foamed. The manufacturing method of different hardness mold foam. 前記２種類のイソシアネート成分はトリレンジイソシアネート，メチレンジイソシアネート又は両者の混合物であり、互いにトリレンジイソシアネートとメチレンジイソシアネートの比率が異なることを特徴とする請求項１記載の異硬度モールドフォームの製造方法。   2. The method for producing a different hardness mold foam according to claim 1, wherein the two kinds of isocyanate components are tolylene diisocyanate, methylene diisocyanate or a mixture of both, and the ratios of tolylene diisocyanate and methylene diisocyanate are different from each other. 前記２種類のイソシアネート成分は、メチレンジイソシアネート０〜３０％およびトリレンジイソシアネート７０〜１００％を含む第１のイソシアネート成分と、メチレンジイソシアネート７０〜１００％およびトリレンジイソシアネート０〜３０％を含む第２のイソシアネート成分からなることを特徴とする請求項１または２記載の異硬度モールドフォームの製造方法。   The two kinds of isocyanate components are a first isocyanate component containing 0-30% methylene diisocyanate and 70-100% tolylene diisocyanate, and a second one containing 70-100% methylene diisocyanate and 0-30% tolylene diisocyanate. The method for producing a different hardness mold foam according to claim 1 or 2, comprising an isocyanate component.
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