JPH02194036A - Blowing agent composition for injection molding and production of foam by using same - Google Patents
Blowing agent composition for injection molding and production of foam by using sameInfo
- Publication number
- JPH02194036A JPH02194036A JP1013624A JP1362489A JPH02194036A JP H02194036 A JPH02194036 A JP H02194036A JP 1013624 A JP1013624 A JP 1013624A JP 1362489 A JP1362489 A JP 1362489A JP H02194036 A JPH02194036 A JP H02194036A
- Authority
- JP
- Japan
- Prior art keywords
- blowing agent
- agent composition
- injection molding
- sodium bicarbonate
- foam
- 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.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 23
- 239000004604 Blowing Agent Substances 0.000 title claims abstract description 16
- 238000001746 injection moulding Methods 0.000 title claims abstract description 12
- 239000006260 foam Substances 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 14
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims abstract description 9
- 239000001509 sodium citrate Substances 0.000 claims abstract description 9
- 239000011787 zinc oxide Substances 0.000 claims abstract description 7
- 239000004156 Azodicarbonamide Substances 0.000 claims abstract description 6
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims abstract description 6
- 235000019399 azodicarbonamide Nutrition 0.000 claims abstract description 6
- 235000014692 zinc oxide Nutrition 0.000 claims abstract 3
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 claims description 7
- 229940038773 trisodium citrate Drugs 0.000 claims description 7
- 229920005992 thermoplastic resin Polymers 0.000 claims description 2
- 235000019263 trisodium citrate Nutrition 0.000 claims 2
- 238000000465 moulding Methods 0.000 abstract description 7
- 238000000354 decomposition reaction Methods 0.000 abstract description 5
- -1 polyethylene Polymers 0.000 abstract description 5
- 229920005989 resin Polymers 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 4
- 239000004793 Polystyrene Substances 0.000 abstract description 3
- 229920002223 polystyrene Polymers 0.000 abstract description 3
- 239000004677 Nylon Substances 0.000 abstract description 2
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- 239000004743 Polypropylene Substances 0.000 abstract description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 abstract description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 abstract description 2
- 229920001778 nylon Polymers 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- 229920001155 polypropylene Polymers 0.000 abstract description 2
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 abstract 2
- 235000011083 sodium citrates Nutrition 0.000 abstract 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004088 foaming agent Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- HWPKGOGLCKPRLZ-UHFFFAOYSA-M monosodium citrate Chemical compound [Na+].OC(=O)CC(O)(C([O-])=O)CC(O)=O HWPKGOGLCKPRLZ-UHFFFAOYSA-M 0.000 description 5
- 239000002524 monosodium citrate Substances 0.000 description 5
- 235000018342 monosodium citrate Nutrition 0.000 description 5
- KINULKKPVJYRON-PVNXHVEDSA-N n-[(e)-[10-[(e)-(4,5-dihydro-1h-imidazol-2-ylhydrazinylidene)methyl]anthracen-9-yl]methylideneamino]-4,5-dihydro-1h-imidazol-2-amine;hydron;dichloride Chemical compound Cl.Cl.N1CCN=C1N\N=C\C(C1=CC=CC=C11)=C(C=CC=C2)C2=C1\C=N\NC1=NCCN1 KINULKKPVJYRON-PVNXHVEDSA-N 0.000 description 5
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 description 3
- 238000004040 coloring Methods 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 229940057995 liquid paraffin Drugs 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- WDSFYHBVGUZHAM-UHFFFAOYSA-K magnesium sodium octadecanoate carbonate Chemical compound C(CCCCCCCCCCCCCCCCC)(=O)[O-].[Mg+2].C([O-])([O-])=O.[Na+] WDSFYHBVGUZHAM-UHFFFAOYSA-K 0.000 description 1
- 235000019359 magnesium stearate Nutrition 0.000 description 1
- YUXGMGTTWAVBPN-UHFFFAOYSA-N magnesium;octadecanoic acid;oxygen(2-) Chemical compound [O-2].[Mg+2].CCCCCCCCCCCCCCCCCC(O)=O YUXGMGTTWAVBPN-UHFFFAOYSA-N 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XPFJYKARVSSRHE-UHFFFAOYSA-K trisodium;2-hydroxypropane-1,2,3-tricarboxylate;2-hydroxypropane-1,2,3-tricarboxylic acid Chemical compound [Na+].[Na+].[Na+].OC(=O)CC(O)(C(O)=O)CC(O)=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O XPFJYKARVSSRHE-UHFFFAOYSA-K 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (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）
本発明は白色、微細気泡となる発泡射出成形用発泡剤組
成物と、それを用いた発泡射出成形品の製造方法に間す
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a foaming agent composition for foam injection molding that forms white, fine cells, and a method for producing foam injection molded products using the same.
（従来の技術）
従来、熱可塑性樹脂の低発泡射出成形に於いては重炭酸
ナトリウム、アゾジカルボンアミド、ジニトロソペンタ
メチレンテトラミン、オキシビス（ベンゼンスルホニル
ヒドラジド）、クエン酸モノナトリウム等の分解型発泡
剤が単独又は併用して使われている。(Prior art) Conventionally, in low-foaming injection molding of thermoplastic resins, decomposable foaming agents such as sodium bicarbonate, azodicarbonamide, dinitrosopentamethylenetetramine, oxybis (benzenesulfonyl hydrazide), and monosodium citrate have been used. are used alone or in combination.
しかし、大部分の発泡剤組成物は成形条件の選定によっ
てシリンダー内の滞留時間が長くなると気泡が粗くなり
、そのため２．５〜３．δｍｍ厚程度の薄肉部では発泡
せず、成形品のヒケやソリを充分解消することが出来な
かった。However, in most blowing agent compositions, the bubbles become coarser when the residence time in the cylinder becomes longer depending on the selection of molding conditions, and therefore the foaming agent compositions have a ratio of 2.5 to 3. Foaming did not occur in thin-walled parts with a thickness of about δmm, and it was not possible to sufficiently eliminate sink marks and warpage in the molded product.
しかしながら、これら従来の発泡剤組成物の中では、ア
ゾジカルボンアミド（以下ＡＤＣＡと省略する） 重炭
酸ナトリウム及びクエン酸モノナトリウムの３成分系を
使用すると滞留時間が長くなっても気泡は微細となる製
造方法であることが知られいた。However, among these conventional blowing agent compositions, when a three-component system of azodicarbonamide (hereinafter abbreviated as ADCA), sodium bicarbonate, and monosodium citrate is used, the bubbles become fine even if the residence time is long. It is known that this is a manufacturing method.
しかるに、この３成分系の発泡剤組成物の最大の欠点は
分解残渣による成形品の着色で、成形品が褐色に着色す
るため、黒色又は濃色の成形品のみにしか利用出来なか
った。However, the biggest drawback of this three-component blowing agent composition is the coloration of molded products due to decomposition residues, and because the molded products are colored brown, it can only be used for black or dark-colored molded products.
（発明が解決しようとする問題点）
本発明はかかる現状に鑑み、気泡の微細な成形品が得ら
れるＡＤＣＡ、重炭酸ナトリウム及びクエン酸モノナト
リウムを中心に他の添加物を調整し、着色問題の解決の
為、鋭意研究を重ねた結果、白色にして微細気泡を有す
る発泡射出成形品の製造を可能にする発泡剤組成物を見
出し完成に至った。(Problems to be Solved by the Invention) In view of the current situation, the present invention has been developed by adjusting other additives, mainly ADCA, sodium bicarbonate, and monosodium citrate, which can produce molded products with fine bubbles, and solving the problem of coloring. In order to solve this problem, as a result of extensive research, we have discovered and completed a foaming agent composition that enables the production of foamed injection molded products that are white and have fine cells.
（問題点を解決する為の手段）
本発明の発泡剤組成物はクエン酸モノナトリウムでは解
決せず、他の種々化合物について検討し、クエン酸トリ
ナトリウムを用いると共に酸化亜鉛を併用し、次の４成
分で構成することによって解決することが出来た。(Means for solving the problem) The blowing agent composition of the present invention did not solve the problem with monosodium citrate, so various other compounds were investigated, and trisodium citrate was used in combination with zinc oxide. We were able to solve this problem by configuring it with four components.
即ち、■ＡＤＣＡ、０重炭酸ナトリウム、■クエン酸ト
リナトリウム及び■酸化亜鉛である。Namely, 1) ADCA, 0 sodium bicarbonate, 2) trisodium citrate, and 2) zinc oxide.
これらの組成割合は、ＡＤＣＡ １００重量部に対し
て、重炭酸ナトリウムは２０〜３００重量部、好ましく
は５０〜２００重量部である。The composition ratio of sodium bicarbonate is 20 to 300 parts by weight, preferably 50 to 200 parts by weight, per 100 parts by weight of ADCA.
クエン酸トリナトリウムは重炭酸ナトリウムの使用量の
１５〜５０％が適当である。A suitable amount of trisodium citrate is 15 to 50% of the amount of sodium bicarbonate used.
クエン酸トリナトリウムが１５％以下になると気泡が荒
れる。When trisodium citrate is less than 15%, bubbles become rough.
酸化亜鉛はクエン酸トリナトリウムの使用量に対して１
．５〜５倍量が適量であり、１．５倍以下となると淡黄
色に着色する。Zinc oxide is 1 per amount of trisodium citrate used.
．． The appropriate amount is 5 to 5 times the amount, and if it is 1.5 times or less, it will be colored pale yellow.
本発明の発泡剤結成物を使用して射出成形する場合の添
加量は、目的とする発泡体の倍率によって異なるが、通
常、樹脂１００重量部に対して０．１〜３．０重量部を
使用する。The amount added when injection molding is performed using the foaming agent composition of the present invention varies depending on the desired expansion ratio of the foam, but is usually 0.1 to 3.0 parts by weight per 100 parts by weight of the resin. use.
本発明の発泡剤組成物の分解温度は１６０〜２００℃で
あるため、成形条件としては２００〜２５０℃が望まし
い。Since the decomposition temperature of the blowing agent composition of the present invention is 160 to 200°C, the molding conditions are preferably 200 to 250°C.
この温度で成形出来る樹脂としてはポリエチレン、ポリ
プロピレン、ポリスチレン（ＣＰ、Ｈ１） ＡＢＳ、
ＡＳｌＡＥＳ及び１２−ナイロン、などの単体、共重合
体もしくは混合物があげられる。Resins that can be molded at this temperature include polyethylene, polypropylene, polystyrene (CP, H1), ABS,
ASlAES and 12-nylon may be used alone, as a copolymer, or as a mixture.
また、本発明の発泡剤組成物を使用する射出成形機は通
常の成形機を利用したショートショット法を始めとして
、ガスカウンタープレッシャー法、多層射出成形法、ヘ
ツテインガ法等いずれの成形機にも適用出来る。In addition, the injection molding machine using the blowing agent composition of the present invention can be applied to any type of molding machine, including the short shot method using a normal molding machine, the gas counter pressure method, the multilayer injection molding method, and the Höttinger method. I can do it.
実施例１．２及び比較例１〜６
ポリプロピレン（ホモポリマー ＭＦＲ９，０）１００
重量部に対して、実施例及び比較例に示す発泡剤組成物
０．６〜０．８６重量部及び流動パラフィンＯ０１重量
部を加えて、タンブラ−でブレンドし、２．５オンスの
射出成形を用いて下記加工条件でショートショット法に
て成形した。Example 1.2 and Comparative Examples 1 to 6 Polypropylene (homopolymer MFR9,0) 100
To the parts by weight, 0.6 to 0.86 parts by weight of the blowing agent composition shown in Examples and Comparative Examples and 1 part by weight of liquid paraffin O0 were added, blended in a tumbler, and injection molded into 2.5 ounces. It was molded using the short shot method under the following processing conditions.
背 圧 （ｋｇ／ｍ２）
６ ０金型 温度 （’Ｃ） ３０〜４
０射出 時間 （ＳＥＣ） １．０金型
サイズ （ｓｍ） １２０Ｘ６０Ｘ６テスト結果
の成形品気泡径と着色状態を表１．２．３に示す。Back pressure (kg/m2)
6 0 mold temperature ('C) 30~4
0 Injection time (SEC) 1.0 Mold size (sm) 120X60X6 Table 1.2.3 shows the molded product bubble diameter and coloring state as a result of the test.
表中、物質名の表現を下記の如く省略する。In the table, the expressions of substance names are omitted as shown below.
クエン酸モノナトリウム →クエン酸Ｎａクエン酸トリ
ナトリウム →クエン＊Ｎａ３重炭酸ナトリウム
→重炭酸Ｎａステアリン酸マグネシウム→ステアリン
酸Ｍｇ酸化マグネシウム →酸化Ｍｇ
以下 余白
シリンダー温度 （”Ｃ） ＣＨ：２００ Ｃｓ
：２２０Ｃ２：２２０ ＣＮ：２２０
射 出 圧 （ｋｇｌ−２） ９
６０実施例３，４及び比較例７〜１２
ポリスチレン（ＨＩタイプ 射出成形用グレード）１０
０重量部に対して、実施例及び比較例に示す発泡剤組成
物を０．６〜０．８４重量部及び流動パラフィン０．１
重量部を加えてタンブラ−でブレンドし、２．５オンス
の射出成形機を用いてショートショット法にて成形した
。Monosodium citrate → Na citrate Trisodium citrate → Citric*Na3 Sodium bicarbonate
→ Sodium bicarbonate Magnesium stearate → Mg stearate Magnesium oxide → Mg oxide or less Margin cylinder temperature (”C) CH: 200 Cs
:220C2:220 CN:220 Injection pressure (kgl-2) 9
60 Examples 3, 4 and Comparative Examples 7 to 12 Polystyrene (HI type injection molding grade) 10
0 parts by weight, 0.6 to 0.84 parts by weight of the blowing agent compositions shown in Examples and Comparative Examples and 0.1 parts by weight of liquid paraffin.
Parts by weight were added, blended in a tumbler, and molded by a short shot method using a 2.5 ounce injection molding machine.
シリンダー温度以外の加工条件は実施例１と同じとする
。The processing conditions other than the cylinder temperature are the same as in Example 1.
シリンダー温度 （”Ｃ） Ｃ）４：２００ Ｃｔ
：２２０Ｃ２：２３０ＣＮ：２３０
テスト結果を表 ４．５．６に示す。Cylinder temperature (”C) C) 4:200 Ct
:220C2:230CN:230 The test results are shown in Table 4.5.6.
以下余白
この様にスクリュー内の滞留時間が長くなっても微細気
泡が維持出来、且つ、成形品の着色が無いのは、実施例
１〜４に示した本発明の発泡剤組成物である。The foaming agent compositions of the present invention shown in Examples 1 to 4 are capable of maintaining fine bubbles even when the residence time in the screw becomes long and do not cause discoloration of the molded product.
比較例４のＡＤＣＡ、重炭酸ナトリウム及びステアリン
酸マグネシウムの３成分は着色しないが、滞留時間が長
くなると気泡が粗くなってく る 。The three components of Comparative Example 4, ADCA, sodium bicarbonate, and magnesium stearate, do not cause coloration, but as the residence time increases, the bubbles become coarser.
その他の比較例１〜３及び６〜１２はいずれも成形品が
着色している。In other Comparative Examples 1 to 3 and 6 to 12, the molded products were colored.
（発明の効果）
本発明の発泡剤組成物を使用するとシリンダー内での滞
留時間が長くなっても微細気泡が維持出来、その上分解
残渣による着色、はなかった。(Effects of the Invention) When the blowing agent composition of the present invention was used, fine bubbles could be maintained even if the residence time in the cylinder became long, and furthermore, there was no discoloration due to decomposition residue.
以上より、次の効果が認められた。From the above, the following effects were recognized.
■ 射出成形機の射出能力に較べて、成形品重量の小さ
なものを成形しなければならない場合、成形品の肉厚が
大きくて、冷却時閉が長くなった場合、又は突発的なト
ラブルなどで、シリンダー内での滞留時間が長くなりで
も微細気泡の成形が得られた。■ When the weight of the molded product is small compared to the injection capacity of the injection molding machine, when the wall thickness of the molded product is large and it takes a long time to close during cooling, or because of sudden trouble. Even if the residence time in the cylinder became longer, fine bubble formation was obtained.
従って成形加工幅が広くなって不良率を減少させて、安
定した成形が可能となった。Therefore, the molding process width has been widened, the defective rate has been reduced, and stable molding has become possible.
■ 微細気泡であるため２．５〜３．５ｍｍ程度の薄肉
部でも発泡出来、成形品のデザインの自由度を広くした
。■ Because the foam is micro-celled, it can be foamed even in thin-walled parts of about 2.5 to 3.5 mm, giving greater freedom in the design of molded products.
■ 分解残渣による着色がないので、どの様な色の成形
品にも使用出来、鮮明な成形品が出来た。■ Since there is no coloration due to decomposition residue, it can be used for molded products of any color, resulting in clear molded products.
Claims (1)
酸トリナトリウム及び酸化亜鉛の四成分を含む射出成形
用発泡剤組成物。 ２）熱可塑性樹脂にアゾジカルボンアミド、重炭酸ナト
リウム、クエン酸トリナトリウム及び酸化亜鉛を含む発
泡剤組成物を用いる発泡射出成形品の製造方法。[Claims] 1) A blowing agent composition for injection molding comprising four components: azodicarbonamide, sodium bicarbonate, trisodium citrate, and zinc oxide. 2) A method for producing a foam injection molded article using a blowing agent composition containing azodicarbonamide, sodium bicarbonate, trisodium citrate, and zinc oxide in a thermoplastic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1013624A JP2714840B2 (en) | 1989-01-23 | 1989-01-23 | Foaming agent composition for injection molding and method for producing foam using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1013624A JP2714840B2 (en) | 1989-01-23 | 1989-01-23 | Foaming agent composition for injection molding and method for producing foam using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02194036A true JPH02194036A (en) | 1990-07-31 |
| JP2714840B2 JP2714840B2 (en) | 1998-02-16 |
Family
ID=11838388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1013624A Expired - Fee Related JP2714840B2 (en) | 1989-01-23 | 1989-01-23 | Foaming agent composition for injection molding and method for producing foam using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2714840B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009263489A (en) * | 2008-04-24 | 2009-11-12 | Toyota Boshoku Corp | Process for producing thermoplastic resin foam molded product |
-
1989
- 1989-01-23 JP JP1013624A patent/JP2714840B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009263489A (en) * | 2008-04-24 | 2009-11-12 | Toyota Boshoku Corp | Process for producing thermoplastic resin foam molded product |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2714840B2 (en) | 1998-02-16 |
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