JPS6114918A - Molding method of rim urethane - Google Patents
Molding method of rim urethaneInfo
- Publication number
- JPS6114918A JPS6114918A JP59137467A JP13746784A JPS6114918A JP S6114918 A JPS6114918 A JP S6114918A JP 59137467 A JP59137467 A JP 59137467A JP 13746784 A JP13746784 A JP 13746784A JP S6114918 A JPS6114918 A JP S6114918A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- coating layer
- cavity
- resin liquid
- reactive resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
- B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/60—Releasing, lubricating or separating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、成形金型のキャビティ内に反応性樹脂液を注
入し、これをキャビティ内で反応硬化させて成形品を得
るようにしたＲＩＭウレタン成形法に関するものである
。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a RIM in which a reactive resin liquid is injected into the cavity of a molding die and is reacted and cured within the cavity to obtain a molded product. This relates to a urethane molding method.
（従来技術）
一般に、ＲＩＭウレタン成形法においては、第１図図示
の装置が用いられる。即ち、成形金型１のキャビティ２
内に注入する反応性樹脂液（Ａ液、Ｂ液よりなる）には
、ミキシングヘッド部３において反応促進用の触媒が予
め混入され、キャビティ２内における樹脂液の反応硬化
をはやめるようにされている。(Prior Art) Generally, in the RIM urethane molding method, the apparatus shown in FIG. 1 is used. That is, the cavity 2 of the molding die 1
The reactive resin liquid (consisting of liquids A and B) to be injected into the cavity 2 is mixed with a reaction promoting catalyst in advance in the mixing head 3 to prevent the reaction hardening of the resin liquid within the cavity 2. ing.
従って、ＲＩＭウレタン成形法における反応速度は、触
媒の混入量により制御されることとなり、その上限は、
成形金型内への樹脂液充填のし易さを最優先に決定され
る。これに反して反応硬化性を重視すると、樹脂液の流
動性が損われて、金型内への充填性能が悪化し、複雑な
形状の成形品を得んとする場合には、不良品発生につな
がるという問題が生じる。Therefore, the reaction rate in the RIM urethane molding method is controlled by the amount of catalyst mixed, and the upper limit is:
The decision is made with top priority given to ease of filling the resin liquid into the mold. On the other hand, if emphasis is placed on reaction curing properties, the fluidity of the resin liquid will be impaired, the filling performance into the mold will deteriorate, and when trying to obtain molded products with complex shapes, it will lead to defective products. The problem arises that it leads to
一方、前記の如く、樹脂液の流動性を優先すると、触媒
量が少ないことに起因して下記の如き不具合が生じる。On the other hand, as mentioned above, if priority is given to the fluidity of the resin liquid, the following problems will occur due to the small amount of catalyst.
（１）成形品の外周に発生するパリ強度が弱くなり、脱
型時に破損して金型側に残り、これを除去清掃する為の
時間がかかり、成形サイクル時間が著しく長くなる。(1) The strength of the flakes generated on the outer periphery of the molded product is weakened, and the flakes are damaged during demolding and remain on the mold side, which takes time to remove and clean, significantly lengthening the molding cycle time.
（２）成形品の最表層であるスキン形成が遅れて、内部
の発泡が表面にまでおよび、ピンホール等の塗装欠陥を
生じる。(2) Formation of the skin, which is the outermost layer of the molded product, is delayed, and internal foaming extends to the surface, causing paint defects such as pinholes.
上記事実に鑑みて、実際には、触媒混入量を決定するに
当り、経験則から適当な妥協点をみつけて運用されてい
るが、それでもなお、上記問題点を完全に解消するには
いたっていない。In view of the above facts, in reality, when determining the amount of catalyst to be mixed, an appropriate compromise is found based on empirical rules, but the above problems have not yet been completely resolved. .
（発明の目的）
本発明は、上記の点に鑑みてなされたもので、成形金型
内へ注入される反応性樹脂液の流動性をそこなうことな
く、成形品表面へのスキン層の形成をはやめるようにす
ることを目的とするものである。(Object of the Invention) The present invention has been made in view of the above points, and is capable of forming a skin layer on the surface of a molded product without impairing the fluidity of the reactive resin liquid injected into the mold. The purpose is to stop it.
（目的を達成するための手段）
本発明は、上記目的達成のため、成形金型のキャビティ
内に注入すべき反応性樹脂液中には、該樹脂液の流動性
か十分に確保される量以下の触媒を混入する一方、前記
キャビティの内表面全域に、触媒を含む被膜層を形成し
ておき、その上に前記樹脂液の射出成形を行なうことを
特徴としている。(Means for Achieving the Object) In order to achieve the above object, the present invention provides that the amount of reactive resin liquid to be injected into the cavity of a molding die is sufficient to ensure fluidity of the resin liquid. The method is characterized in that while the following catalysts are mixed, a coating layer containing the catalyst is formed over the entire inner surface of the cavity, and the resin liquid is injection molded thereon.
又、前記被膜層は、具体的には離型剤（通常のＲＩＭウ
レタン成形法における工程に用いられる）中に触媒を混
入したものをキャヒティ内表面に塗布することによって
形成される。つまり、第２図図示の如く、キャビテイ２
内表面全域に、触媒Ｃを含む離型剤ａからなる被膜Ｎ！
Ｉ４が形成されるのである。Further, the coating layer is specifically formed by coating the inner surface of the cavity with a mold release agent (used in the process of the normal RIM urethane molding method) mixed with a catalyst. In other words, as shown in FIG.
A coating N made of mold release agent a containing catalyst C is formed over the entire inner surface!
I4 is formed.
而して、上記手段を施した上で、ＲＩＭウレタン成形を
行なうと、相対的に成形品表面側（即ち、キャビティ内
表面側）の触媒濃度が増大することとなり、その分だけ
表面層（スキン層）の形成が速くなる。しかも、キャビ
ティ内における樹脂液の流れは、発泡層を通して行なわ
れるので、早期硬化する表面層の影響を受けず良好とな
る。Therefore, if RIM urethane molding is performed after the above measures have been taken, the catalyst concentration on the surface side of the molded product (i.e., the inner surface side of the cavity) will relatively increase, and the surface layer (skin) will increase by that amount. layer) is formed faster. Furthermore, since the resin liquid flows within the cavity through the foamed layer, it is not affected by the surface layer which hardens early, and is thus improved.
上述の如く、触媒を離型剤に混入する場合には、離型剤
中のワックス成分の融点範囲、離型剤中の触媒濃度およ
び離型剤塗布量を下記の如く決定するのが望ましい。As mentioned above, when a catalyst is mixed into a mold release agent, it is desirable to determine the melting point range of the wax component in the mold release agent, the catalyst concentration in the mold release agent, and the coating amount of the mold release agent as described below.
（１）離型剤中のワックス成分の融点範囲ワックス成分
の融点が低すぎると、反応性樹脂液を注入する際に、離
型剤が部分的に押し流されて触媒量の分布が悪くなり、
充分な効果が期待できず、逆にワックス成分の融点が高
すぎると、成形品脱型後においても、大部分のワックス
成分が型表面に残留することとなり、連続的に多数成形
した場合に、触媒量の制御が困難になる。よって、ワッ
クス分の融点範囲としては、型表面で反応性樹脂液に押
し流されない程度の硬さを有し、且つ脱型時に大部分の
ワックス分が成形品に付着して取り出される程度の軟ら
かさを有するものが選定される。実験によれば、融点９
５〜１００℃のワックス成分を用いるのが望ましいこと
がわかった。(1) Melting point range of the wax component in the mold release agent If the melting point of the wax component is too low, the mold release agent will be partially washed away when the reactive resin liquid is injected, resulting in poor catalyst amount distribution.
If a sufficient effect cannot be expected and the melting point of the wax component is too high, most of the wax component will remain on the mold surface even after the molded product is demolded, and if a large number of molds are continuously molded, It becomes difficult to control the amount of catalyst. Therefore, the melting point range for the wax component is to be hard enough to not be washed away by the reactive resin liquid on the mold surface, and soft enough that most of the wax component adheres to the molded product and is removed during demolding. Those with the highest quality are selected. According to experiments, the melting point is 9
It has been found desirable to use a wax component of 5-100°C.
（２）離型剤中の触媒濃度
離型剤中の触媒濃度が高すぎると、反応性樹脂液注入時
に表面での反応があまりにら急速に進みすぎて、それに
伴う反応熱の制御が困難となり、成形品表面に「変色」
、「焼け」等の不具合が生じ、又、触媒濃度が低すぎる
と、所期の効果を期待することができない。そこで、触
媒活性を考慮しつつ、最適な範囲を設定する必要がある
。(2) Catalyst concentration in the mold release agent If the catalyst concentration in the mold release agent is too high, the reaction on the surface will proceed too rapidly when the reactive resin liquid is injected, making it difficult to control the accompanying reaction heat. , "discoloration" on the surface of the molded product
In addition, if the catalyst concentration is too low, the desired effect cannot be expected. Therefore, it is necessary to set an optimal range while taking the catalytic activity into consideration.
（３）離型剤の塗布量 脱型性を優先して、この量を決定しなければならない。(3) Application amount of mold release agent This amount must be determined with priority given to demoldability.
全体の塗布量は、これにより規定されるので、この量に
前記触媒濃度も影響される。Since the total coating amount is determined by this, the catalyst concentration is also influenced by this amount.
（実施例） 以下、本発明のいくつかの好適な実施例を列記する。(Example) Some preferred embodiments of the present invention are listed below.
実施例１
（１）反応性樹脂液
Ａ液：カルボジイミド変性ＭＤ、Ｉ（メチレンジイソシ
アネート）、ＮＧＯ含有含有率２
巳
子量５０００・・・９０重量部
エチレングリコール・・・１０重量部
触媒（ジブチルチンジラウレート）・・・０、２重量部
発泡剤（フロン−Ｉ＋）・・・３重量部上記Ａ液、Ｂ液
の混合液を金型キャビティ内に注入する。Example 1 (1) Reactive resin liquid A: carbodiimide-modified MD, I (methylene diisocyanate), NGO content 2 Miko amount: 5000...90 parts by weight Ethylene glycol...10 parts by weight Catalyst (dibutyltin) Dilaurate)...0.2 parts by weight Foaming agent (Freon-I+)...3 parts by weight A mixed solution of the above liquids A and B is injected into the mold cavity.
（２）離型剤に添加する触媒の種類
ジブチルチンジラウレート
（３）触媒濃度範囲
０１〜０．５％（重量）
（４）離型剤の塗布量
１００〜１ ５ ０ ｇ／ａｎ”
（５）パリ強度の向上効果
上記反応性樹脂液注入３０秒後のパリの引張り強度が２
２ ０ Ｋｇ／ｃｍ”に向上した〈従来例９０Ｋｇ／
ｃｍ’）。(2) Type of catalyst added to the mold release agent dibutyltin dilaurate (3) Catalyst concentration range 01-0.5% (weight) (4) Coating amount of mold release agent 100-150 g/an'' (5 ) Improving effect on paris strength The tensile strength of pari after 30 seconds of injecting the above reactive resin liquid was 2.
20 Kg/cm” (conventional example 90 Kg/cm)
cm').
（６）成形品表面性状の改良効果
ピンホールの発生は皆無で、その他の欠陥も発生しない
。(6) Effect of improving the surface properties of molded products No pinholes or other defects occur.
実施例２
（１）反応性樹脂液
Ａ液：ブレボリマ−変性ＭＤＩ、ＮＧＯ含有率２２、８
％
Ｂ液；ポリプロピレングリコール（Ｐ．Ｐ，Ｇ）分子量
３０００・・・８０重量部
１、４−ブタンジオール・・・２０重量部触触媒（ジブ
チルチンジラウレート）・・・０．１重量部
触媒２（トリエチレンジアミン）・・・０１重量部
発泡剤（フロン−１ｌ）・・・２重量部上記Ａ液、Ｂ液
の混合液を金型キャビティ内に注入する。Example 2 (1) Reactive resin liquid A: Brevolimer-modified MDI, NGO content 22, 8
% B solution; polypropylene glycol (P.P,G) molecular weight 3000...80 parts by weight 1,4-butanediol...20 parts by weight Catalyst (dibutyltin dilaurate)...0.1 part by weight Catalyst 2 (Triethylenediamine)...01 parts by weight Foaming agent (Freon-1l)...2 parts by weight A mixed solution of the above liquids A and B is injected into the mold cavity.
（２）離型剤に添加する触媒の種類
トリエチレンジアミン
（３）触媒濃度範囲
０、２〜０．５％（重量）
（４）離型剤の塗布量
１００〜１ ５ ０ ｇ／ｍ’
（５）パリ強度の向上効果
上記反応性樹脂液注入３０秒後のパリの引張り強度が２
８ ０ Ｋｇ／ｃｍ”に向上した（従来例５０Ｋｇ／
ｃｖａ″）。(2) Type of catalyst added to mold release agent Triethylenediamine (3) Catalyst concentration range 0, 2-0.5% (weight) (4) Coating amount of mold release agent 100-150 g/m' ( 5) Effect of improving Paris strength The tensile strength of Paris after 30 seconds of injecting the above reactive resin liquid was 2.
80 Kg/cm” (conventional example 50 Kg/cm)
cva'').
（６）成形品表面性状の改良効果
ピンホールの発生は皆無で、その他の欠陥も発生しない
。(6) Effect of improving the surface properties of molded products No pinholes or other defects occur.
実施例３
（１）反応性樹脂液
Ａ液：カルボジイミド変性ＭＤＩＳＮＣＯ含有率２９％
・・・９７重量部
発泡剤（フロン−１ｌ）・・・３重量部Ｂ液：ボリブロ
ピレングリコール（Ｐ，Ｐ，Ｇ）分子量５０００・・・
９０重量部
゛ エチレングリコール・・・１０重量部触媒（ジブ
デルチンジラウレート）・・・０、２重量部
ミルドガラス繊維・・・２０重量部
（２）離型剤に添加する触媒の種類
スタナスオクトエート
（３）触媒濃度範囲
０、０１〜０．０１５％（重量）
（４）離型剤の塗布量
１００〜１５０ｇ／ｍ’
（５）パリ強度の向上効果
上記反応性樹脂液注入３０秒後のパリの引張り強度が３
１ ０ Ｋｇ／ｃｍ’に向上した（従来例７０Ｋｇ／
Ｃ１１″）。Example 3 (1) Reactive resin liquid A: Carbodiimide-modified MDISNCO content 29%
...97 parts by weight Foaming agent (1 liter of Freon) ...3 parts by weight Liquid B: Polypropylene glycol (P, P, G) Molecular weight 5000...
90 parts by weight Ethylene glycol... 10 parts by weight Catalyst (dibdeltin dilaurate)... 0, 2 parts by weight Milled glass fiber... 20 parts by weight (2) Type of catalyst added to mold release agent Stanus Octoate (3) Catalyst concentration range: 0.01~0.015% (weight) (4) Coating amount of mold release agent: 100~150 g/m' (5) Effect on improving Paris strength: 30 seconds for above reactive resin liquid injection The tensile strength of the latter Paris is 3
improved to 10 Kg/cm' (conventional example 70 Kg/cm')
C11″).
（６）成形品表面性状の改良効果
ピンホールの発生は皆無で、その他の表面欠陥も発生し
ない。(6) Effect of improving surface properties of molded product No pinholes or other surface defects occur.
（発明の効果）
叙上の如く、本発明によれば、成形金型のキャビティ内
表面全域に、反応促進作用を発揮する触媒を含む被膜層
を形成するという手段を追加するのみで、反応性樹脂液
の流動性を阻害することなく、表面層（スキン層）の形
成を速やかに行なうことができるので、成形品表面にピ
ンホール発生等の欠陥があられれるのが防止され、ＲＩ
Ｍウレタン成形品として理想的なものを得ることができ
るという優れた効果がある。(Effects of the Invention) As described above, according to the present invention, the reactivity can be improved by simply adding a means of forming a coating layer containing a catalyst that promotes the reaction over the entire inner surface of the cavity of the mold. Since the surface layer (skin layer) can be formed quickly without impeding the fluidity of the resin liquid, defects such as pinholes on the surface of the molded product are prevented, and RI
This has the excellent effect of making it possible to obtain an ideal M urethane molded product.
又、成形品表面層の反応硬化かはやめられるので、パリ
全体としての強度が早期に発生することとなり、脱型時
における金型側へのパリ残留がなくなり、連続成形にお
ける成形サイクル時間の短縮が図れるという効果もある
。In addition, since the reaction hardening of the surface layer of the molded product is stopped, the strength of the entire mold is generated earlier, and there is no residual mold remaining on the mold side during demolding, which shortens the molding cycle time in continuous molding. It also has the effect of helping you achieve your goals.
第１図は本発明のＲＩＭウレタン成形法に使用される装
置例を示す断面図、第２図は第１図のＡ部拡大図である
。
１・・・・・成形金型
２・・・・・キャビティ
３・・・・・ミキシングヘラＦ部
４・・・・・被膜層
ａ・・・・・離型剤
Ｃ・・・・・触媒FIG. 1 is a sectional view showing an example of an apparatus used in the RIM urethane molding method of the present invention, and FIG. 2 is an enlarged view of section A in FIG. 1. 1... Molding die 2... Cavity 3... Mixing spatula F section 4... Coating layer a... Mold release agent C... Catalyst
Claims (1)
これを該キャビティ内にて反応硬化させてＲＩＭウレタ
ン成形品を形成するにあたって、前記反応性樹脂液中に
、該樹脂液の流動性が十分に確保される量以下の触媒を
混入する一方、前記キャビティの内表面全域には、触媒
を含む被膜層を形成しておき、その上に前記樹脂液の射
出成形を行うことを特徴とするＲＩＭウレタン成形法。 ２、前記被膜層が触媒を含む離型剤で形成されている前
記特許請求の範囲第１項記載のＲＩＭウレタン成形法。 ３、前記離型剤中における触媒量が０．１〜０．１５％
（重量）の範囲とされている前記特許請求の範囲第２項
記載のＲＩＭウレタン成形法。[Claims] 1. Injecting a reactive resin liquid into the cavity of a molding die,
When this is reacted and cured in the cavity to form a RIM urethane molded product, a catalyst is mixed into the reactive resin liquid in an amount that is not more than enough to ensure the fluidity of the resin liquid. A RIM urethane molding method characterized in that a coating layer containing a catalyst is formed on the entire inner surface of the cavity, and injection molding of the resin liquid is performed on the coating layer. 2. The RIM urethane molding method according to claim 1, wherein the coating layer is formed of a mold release agent containing a catalyst. 3. The amount of catalyst in the mold release agent is 0.1 to 0.15%
(weight) of the RIM urethane molding method according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59137467A JPS6114918A (en) | 1984-07-02 | 1984-07-02 | Molding method of rim urethane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59137467A JPS6114918A (en) | 1984-07-02 | 1984-07-02 | Molding method of rim urethane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6114918A true JPS6114918A (en) | 1986-01-23 |
Family
ID=15199285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59137467A Pending JPS6114918A (en) | 1984-07-02 | 1984-07-02 | Molding method of rim urethane |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6114918A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001191337A (en) * | 1999-10-29 | 2001-07-17 | Sanyo Chem Ind Ltd | Release agent composition and slush molding method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5067360A (en) * | 1973-10-19 | 1975-06-06 | ||
| JPS55154135A (en) * | 1979-05-14 | 1980-12-01 | Itt | Preparation of polyurethane mold part |
-
1984
- 1984-07-02 JP JP59137467A patent/JPS6114918A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5067360A (en) * | 1973-10-19 | 1975-06-06 | ||
| JPS55154135A (en) * | 1979-05-14 | 1980-12-01 | Itt | Preparation of polyurethane mold part |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001191337A (en) * | 1999-10-29 | 2001-07-17 | Sanyo Chem Ind Ltd | Release agent composition and slush molding method |
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