JP4115644B2 - Method for recovering metal hydroxides from non-halogen flame retardant molded products - Google Patents
Method for recovering metal hydroxides from non-halogen flame retardant molded products Download PDFInfo
- Publication number
- JP4115644B2 JP4115644B2 JP2000018981A JP2000018981A JP4115644B2 JP 4115644 B2 JP4115644 B2 JP 4115644B2 JP 2000018981 A JP2000018981 A JP 2000018981A JP 2000018981 A JP2000018981 A JP 2000018981A JP 4115644 B2 JP4115644 B2 JP 4115644B2
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- Prior art keywords
- metal hydroxide
- halogen flame
- flame retardant
- retardant molded
- solvent
- 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.)
- Expired - Lifetime
Links
- 239000003063 flame retardant Substances 0.000 title claims description 36
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims description 35
- 229910000000 metal hydroxide Inorganic materials 0.000 title claims description 33
- 150000004692 metal hydroxides Chemical class 0.000 title claims description 33
- 229910052736 halogen Inorganic materials 0.000 title claims description 31
- 150000002367 halogens Chemical class 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 22
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 24
- 239000002904 solvent Substances 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 9
- 229920005672 polyolefin resin Polymers 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 239000011342 resin composition Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000008096 xylene Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000011084 recovery Methods 0.000 description 15
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 9
- 239000000347 magnesium hydroxide Substances 0.000 description 9
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 9
- 239000002699 waste material Substances 0.000 description 8
- 238000004090 dissolution Methods 0.000 description 6
- 229920003002 synthetic resin Polymers 0.000 description 6
- 239000000057 synthetic resin Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- -1 pipes Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000012778 molding material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- IVORCBKUUYGUOL-UHFFFAOYSA-N 1-ethynyl-2,4-dimethoxybenzene Chemical compound COC1=CC=C(C#C)C(OC)=C1 IVORCBKUUYGUOL-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- GJRQTCIYDGXPES-UHFFFAOYSA-N iso-butyl acetate Natural products CC(C)COC(C)=O GJRQTCIYDGXPES-UHFFFAOYSA-N 0.000 description 1
- FGKJLKRYENPLQH-UHFFFAOYSA-M isocaproate Chemical compound CC(C)CCC([O-])=O FGKJLKRYENPLQH-UHFFFAOYSA-M 0.000 description 1
- OQAGVSWESNCJJT-UHFFFAOYSA-N isovaleric acid methyl ester Natural products COC(=O)CC(C)C OQAGVSWESNCJJT-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、オレフィン系樹脂と金属水酸化物とを主成分として含有するノンハロゲン難燃性樹脂組成物からなる各種成形品、特にその廃棄物から金属水酸化物を回収する方法に関する。
【０００２】
【従来の技術】
オレフィン系樹脂に難燃剤として金属水酸化物を配合してなる所謂ノンハロゲン難燃性樹脂組成物は、難燃性が高く、有害なハロゲン系ガスを発生しない等の理由から、ケ−ブルの被覆材やパイプ類、建材、電気器機の容器類等をはじめとして難燃性が要求される各種部材に広く使用されている。特に近年におけるノンハロゲン難燃性樹脂組成物からなるこれらの成形品の普及率の増加は著しく、それに伴ってその廃棄物の処理が大きな問題になってきている。尚、本明細書において、ノンハロゲン難燃性樹脂組成物からなる成形品及びその廃棄物を含めて「ノンハロゲン難燃性成形品」と呼ぶ。
【０００３】
従来、合成樹脂廃棄物の廃棄処理方法としては、焼却処理が一般的である。しかし、ノンハロゲン難燃性成形品は、その高い難燃性故に焼却が困難であり、この焼却による廃棄処理ができない。
【０００４】
また、省資源の観点から合成樹脂廃棄物の再利用も試みられており、従来では同種の新しい合成樹脂と混合して成形材料として再利用する方法が一般的に採られている。しかし、合成樹脂廃棄物は多種多様であり、またたとえ同一品種であっても経時劣化の程度により物性が異なっていることから、新しい合成樹脂との調合が困難な場合が多く、また用途にも制限があり、再生率を余り高くできないという問題を抱えている。このような問題はノンハロゲン難燃性成形品においても同様に起こり得ることから、有効な再生方法とは言えない。
【０００５】
また、溶媒を用いて含有成分を溶解、抽出して分別回収する方法も提案されている。例えば、特開平６−１５７８１２号公報には、ノンハロゲン難燃性成形品をｐＨ５以下の強酸を用いて処理し、酸溶液中に金属水酸化物をはじめとする各種含有成分を溶解又は沈降させて分取する方法が記載されている。しかし、この方法では、金属水酸化物は金属イオンの形で回収されるため、再利用に供するためには適当な処置を別途必要とする。また、処理液が強酸であるため、取り扱いに難がある。
【０００６】
同様に溶媒を用いて合成樹脂廃棄物を再生する方法として、本出願人も、特開平１１−２６３８７０号公報において、ポリオレフィン樹脂加工物に溶解パラメータが９．２〜９．８の溶媒を接触させ、その抽出物を含む液相からポリオレフィン樹脂を主成分とする固形分を分離する方法を提案している。しかし、この方法は、金属水酸化物を多量に含有するノンハロゲン難燃性成形品については有効とは言い難く、金属水酸化物を高い回収率で分別回収することはできない。
【０００７】
このように、ノンハロゲン難燃性成形品から金属水酸化物を高い回収率で分別回収できる方法は未だ確立されていない状況にある。特に、このノンハロゲン難燃性成形品は、通常、オレフィン系樹脂と同量以上という多量の金属水酸化物を含んでおり、この金属水酸化物を高い回収率で回収できれば、省資源の観点から極めて有利となる。
【０００８】
【発明が解決しようとする課題】
従って、本発明の目的は、上記従来の状況に鑑み、ノンハロゲン難燃性成形品から金属水酸化物を安全で容易に、かつ高い回収率で分別回収することが可能な方法を提供することにある。
【０００９】
【課題を解決するための手段】
本発明者は、上記目的を達成すべく鋭意研究した結果、ノンハロゲン難燃性成形品を特定の溶媒を用いて溶解処理することにより金属水酸化物を高い回収率で回収できることを見出し、本発明を完成するに至った。
【００１０】
即ち、本発明は、上記目的を達成するために、オレフィン系樹脂と金属水酸化物とを主成分として含有するノンハロゲン難燃性樹脂組成物を成形してなる成形品を、溶解パラメーターが８．７以上９．２未満の溶媒と接触させ、次いで固液分離して金属水酸化物を固形物として分取し、乾燥することを特徴とするノンハロゲン難燃性成形品からの金属水酸化物の回収方法を提供する。
【００１１】
【発明の実施の形態】
以下、本発明に関して詳細に説明する。
本発明において対象となるノンハロゲン難燃性成形品は、オレフィン系樹脂に難燃剤である金属水酸化物を配合した樹脂組成物の成形品であれば、その形態等は特に制限されるものではない。例えば、使用済の電線被覆材やパイプ類、建材、電気機器の容器類等を対象とすることができ、またこれら部材の使用期間（劣化の程度）も不問である。また、これら部材を製造する時に発生した成形ロス材を対象とすることもできる。
【００１２】
また、ノンハロゲン難燃性成形品の組成も特に制限されるものではなく、オレフィン系樹脂として、例えばポリエチレンやポリプロピレン等のαーオレフィンのホモポリマー、あるいは他のモノマーとの共重合体、例えばエチレン−アクリル酸エチル共重合体やエチレン−酢酸ビニル共重合体等であってもよい。一方、金属水酸化物も特に制限されることはなく、水酸化マグネシウム、水酸化アルミニウム、水酸化ジルコニウム等の難燃剤として何れも公知の金属水酸化物が配合されていてよく、その含有量も通常の範囲で構わない。更に、酸化防止剤や紫外線吸収剤、滑剤等の従来よりノンハロゲン難燃性成形品に添加される各種添加剤が配合されていても差し支えない。
【００１３】
本発明の実施に当たっては、先ず、上記のノンハロゲン難燃性成形品を、溶解パラメーター（ＳＰ値）が８．７以上９．２未満の溶媒と接触させてその可溶分を溶解させる。この時、溶解パラメーターが８．７未満の溶媒、あるいは９．２以上の溶媒を用いたのでは、何れの場合も本発明の目的が達せられない。この溶解パラメーターが８．７〜９．２未満の溶媒の例として、単独溶媒では例えばトルエン（ＳＰ値：８．９）、キシレン（ＳＰ値：８．８）等を好適に挙げることができる。また、複数種の溶媒をこの溶解パラメータの範囲となるように適宜組み合わせて使用することもできる。
【００１４】
また、上記の溶解処理において、溶媒とノンハロゲン難燃性成形品との接触方法は、ノンハロゲン難燃性成形品と溶媒中に浸漬する方法が最も簡便で好ましい。この時、ノンハロゲン難燃性成形品は予め裁断して細片化しておくことが処理時間を短縮する上で好ましい。また、この溶解処理は常温、常圧下で行うことができるが、必要に応じて加熱、加圧下で行うこともできる。溶媒の使用量は処理条件に応じて適宜設定することができるが、ノンハロゲン難燃性成形品１００重量部に対して２００〜４００重量部が適当である。
【００１５】
上記の溶解処理に次いで、得られた処理物を固形物と液相とに固液分離し、固形物を目的の金属水酸化物として回収する。この処理物の固液分離は遠心分離やデカンテーション、濾過等の各種の固液分離手段を適宜選択して用いて行うことができ、必要に応じて、これらの固液分離手段を適宜組み合わせて用いて行うこともできる。
【００１６】
そして、回収された固形物は、必要に応じて上記の溶解処理に使用した溶媒を用いて再び洗浄した後、乾燥することにより、高純度の金属水酸化物として回収される。本発明による金属水酸化物の回収率は、理論配合量、即ちノンハロゲン難燃性成形品の成形原料中の金属水酸化物の配合量の９９重量％以上と極めて高いものである。そして。この金属水酸化物は、再びノンハロゲン難燃性成形品の成形材料として利用される。
【００１７】
一方、上記固液分離により固形物を分離した後の液相は、樹脂成分並びに金属水酸化物以外の各種添加物を含んでいる。従って、この液相から含有成分を回収することが望ましい。この回収は、例えば特開平１１−２６３８７０号公報に記載されている方法に従うことができ、溶解パラメータが９．２〜９．８の第一溶媒、溶解パラメータが６．６〜７．８の第二溶媒、及び溶解パラメータが１３．５〜１４．８の第三溶媒を順次用い、抽出操作を複数回繰り返すことによって液相から樹脂成分、並びに滑剤、その分解物である高級脂肪酸等の比較的高極性の有機物、酸化防止剤、紫外線吸収剤等の比較的低極性の有機物をそれぞれ分離回収することができる。これらの回収物は、溶媒を除去した後、ノンハロゲン難燃性成形品の成形材料として再利用することができる。
【００１８】
上記一連の操作により、ノンハロゲン難燃性成形品から金属水酸化物、更には樹脂成分、その他の添加剤を高い回収率で回収することが可能となる。しかも、強酸を使用することもなく、また特別な装置や過酷な条件を要することなく各操作を行うことができる。
【００１９】
【実施例】
以下、実施例により本発明を更に具体的に説明するが、本発明は以下の実施例により何ら限定されるものではない。
【００２０】
（実施例１）
水酸化マグネシウムを４９．２重量％含有するポリエチレンを用いて押出成形により導線上にシースを被覆し、その時に発生した成形ロス材を集めて試験片とした。そして、この試験片を裁断した細片３０ｇをトルエン５００ｍｌに５０℃にて４時間浸漬して溶解処理し、得られた処理物を遠心分離機により固液分離した。次いで、分離された固形物をトルエンで再洗浄した後、乾燥して水酸化マグネシウムを回収した。この一連の操作を５回行い、各回における水酸化マグネシウムの回収率（試験片全量に対する水酸化マグネシウム量：重量％）を表１に示した。
【００２１】
【表１】
上記５回の水酸化マグネシウムの回収率の平均値は４９．０重量％であり、この値は理論配合値（成形原料における水酸化マグネシウムの含有量）４９．２重量％に対して９９．６％である。このことから。本発明により極めて高い回収率で金属水酸化物を回収できることがわかる。
【００２３】
（比較例１）
実施例１に従い、トルエンに代えて酢酸イソブチル（溶解パラメータ：８．３）を用いて同様の処理を行った。水酸化マグネシウムの平均回収率は７３．１％であり、実施例１のトルエンに比べて低下していた。
【００２４】
（比較例２）
実施例１に従い、トルエンに代えてアセトン（溶解パラメータ：９．８）を用いて同様の処理を行った。水酸化マグネシウムの平均回収率は６４．４％であり、実施例１のトルエンに比べて低下していた。
【００２５】
【発明の効果】
以上説明したように、本発明によれば、ノンハロゲン難燃性成形品から金属水酸化物を、安全で容易に、かつ高い回収率で分別回収することが可能となる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to various molded articles comprising a non-halogen flame retardant resin composition containing olefinic resin and metal hydroxide as main components, and more particularly to a method for recovering metal hydroxide from its waste.
[0002]
[Prior art]
The so-called non-halogen flame retardant resin composition obtained by blending a metal hydroxide as a flame retardant with an olefin resin has a high flame retardancy and does not generate harmful halogen gas. It is widely used for various members that require flame retardancy, such as materials, pipes, building materials, containers for electric appliances, and the like. In particular, in recent years, an increase in the diffusion rate of these molded products made of a halogen-free flame retardant resin composition has been remarkable, and accordingly, disposal of the waste has become a big problem. In the present specification, a molded product made of a non-halogen flame retardant resin composition and its waste are referred to as “non-halogen flame retardant molded product”.
[0003]
Conventionally, incineration is a common waste disposal method for synthetic resin waste. However, non-halogen flame-retardant molded products are difficult to incinerate due to their high flame retardancy, and cannot be disposed of by incineration.
[0004]
In addition, from the viewpoint of saving resources, the reuse of synthetic resin waste has been attempted, and conventionally, a method of mixing with a new synthetic resin of the same type and reusing it as a molding material is generally employed. However, there are many types of synthetic resin wastes, and even with the same variety, the physical properties differ depending on the degree of deterioration over time, so it is often difficult to formulate with new synthetic resins, and also for applications. There is a problem that there is a limit and the playback rate cannot be increased too much. Such a problem can occur in a non-halogen flame-retardant molded product as well, and thus cannot be said to be an effective recycling method.
[0005]
In addition, a method of separating and recovering components by dissolving and extracting them using a solvent has been proposed. For example, in JP-A-6-157812, a non-halogen flame retardant molded article is treated with a strong acid having a pH of 5 or less, and various components including metal hydroxide are dissolved or precipitated in an acid solution. A method of sorting is described. However, in this method, since the metal hydroxide is recovered in the form of metal ions, an appropriate measure is separately required for reuse. Moreover, since the treatment liquid is a strong acid, it is difficult to handle.
[0006]
Similarly, as a method for regenerating synthetic resin waste using a solvent, the present applicant also disclosed in JP-A No. 11-263870 that a polyolefin resin processed product is brought into contact with a solvent having a solubility parameter of 9.2 to 9.8. And a method for separating a solid content mainly composed of a polyolefin resin from a liquid phase containing the extract. However, this method is hardly effective for a non-halogen flame-retardant molded article containing a large amount of metal hydroxide, and the metal hydroxide cannot be separated and recovered at a high recovery rate.
[0007]
As described above, a method for separating and recovering metal hydroxide from a non-halogen flame-retardant molded article at a high recovery rate has not yet been established. In particular, this non-halogen flame retardant molded product usually contains a large amount of metal hydroxides equal to or more than the olefin resin, and if this metal hydroxide can be recovered at a high recovery rate, from the viewpoint of resource saving. This is extremely advantageous.
[0008]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a method capable of recovering a metal hydroxide from a non-halogen flame-retardant molded article in a safe and easy manner and at a high recovery rate in view of the conventional situation. is there.
[0009]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the present inventors have found that a metal hydroxide can be recovered at a high recovery rate by subjecting a non-halogen flame-retardant molded product to dissolution treatment using a specific solvent, and the present invention. It came to complete.
[0010]
That is, in order to achieve the above object, the present invention provides a molded product obtained by molding a non-halogen flame retardant resin composition containing an olefin resin and a metal hydroxide as main components, with a solubility parameter of 8. 7 is contacted with 9.2 less solvent than, then solid-liquid separation to aliquoted metal hydroxide as a solid, the metal hydroxide from the halogen-free flame-retardant molded article characterized by drying Provide recovery methods.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The non-halogen flame retardant molded product targeted in the present invention is not particularly limited as long as it is a molded product of a resin composition in which a metal hydroxide as a flame retardant is blended with an olefin resin. . For example, used wire covering materials, pipes, building materials, containers for electrical equipment, and the like can be targeted, and the period of use (the degree of deterioration) of these members is not questioned. Further, it is possible to target a molding loss material generated when manufacturing these members.
[0012]
Further, the composition of the non-halogen flame retardant molded product is not particularly limited, and as the olefin resin, for example, an α-olefin homopolymer such as polyethylene or polypropylene, or a copolymer with another monomer, such as ethylene-acrylic. An ethyl acid copolymer or an ethylene-vinyl acetate copolymer may be used. On the other hand, the metal hydroxide is not particularly limited, and any known metal hydroxide may be blended as a flame retardant such as magnesium hydroxide, aluminum hydroxide, zirconium hydroxide, etc. It does not matter in the normal range. Furthermore, various additives that are conventionally added to non-halogen flame-retardant molded products such as antioxidants, ultraviolet absorbers, and lubricants may be blended.
[0013]
In practicing the present invention, first, the non-halogen flame retardant molded article is brought into contact with a solvent having a solubility parameter (SP value) of 8.7 or more and less than 9.2 to dissolve the soluble component. At this time, if a solvent having a solubility parameter of less than 8.7, or a solvent having a solubility parameter of 9.2 or more is used, the object of the present invention cannot be achieved in any case. As examples of the solvent having a solubility parameter of 8.7 to less than 9.2, for example, toluene (SP value: 8.9), xylene (SP value: 8.8), and the like can be preferably used as a single solvent. Further, a plurality of types of solvents can be used in appropriate combination so as to be within the range of the solubility parameter.
[0014]
In the above-described dissolution treatment, the method of contacting the solvent with the non-halogen flame retardant molded product is most preferably and preferably the method of immersing in the non-halogen flame retardant molded product and the solvent. At this time, it is preferable to cut the non-halogen flame-retardant molded product in advance into pieces to reduce the processing time. The dissolution treatment can be performed at normal temperature and normal pressure, but can be performed under heating and pressure as necessary. Although the usage-amount of a solvent can be suitably set according to process conditions, 200-400 weight part is suitable with respect to 100 weight part of non-halogen flame-retardant molded articles.
[0015]
Following the above dissolution treatment, the obtained treated product is solid-liquid separated into a solid and a liquid phase, and the solid is recovered as a target metal hydroxide. The solid-liquid separation of the treated product can be performed by appropriately selecting and using various solid-liquid separation means such as centrifugal separation, decantation, and filtration. If necessary, these solid-liquid separation means can be appropriately combined. Can also be used.
[0016]
And the collect | recovered solid substance is collect | recovered as a highly purified metal hydroxide by drying, after washing | cleaning again using the solvent used for said melt | dissolution process as needed. The recovery rate of the metal hydroxide according to the present invention is as extremely high as 99% by weight or more of the theoretical blending amount, that is, the blending amount of the metal hydroxide in the molding raw material of the non-halogen flame retardant molded product. And then. This metal hydroxide is again used as a molding material for non-halogen flame-retardant molded products.
[0017]
On the other hand, the liquid phase after the solid matter is separated by the solid-liquid separation contains various additives other than the resin component and the metal hydroxide. Therefore, it is desirable to recover the contained components from this liquid phase. This recovery can be performed, for example, according to a method described in JP-A No. 11-263870, a first solvent having a solubility parameter of 9.2 to 9.8, and a first solvent having a solubility parameter of 6.6 to 7.8. Using two solvents and a third solvent having a solubility parameter of 13.5 to 14.8 in order, and repeating the extraction operation a plurality of times, the resin component from the liquid phase, the lubricant, and the higher fatty acids that are decomposed products thereof are relatively Relatively low-polar organic substances such as high-polar organic substances, antioxidants, and UV absorbers can be separated and recovered. These recovered materials can be reused as molding materials for non-halogen flame-retardant molded products after removing the solvent.
[0018]
Through the above series of operations, it becomes possible to recover the metal hydroxide, further the resin component, and other additives from the non-halogen flame-retardant molded article at a high recovery rate. In addition, each operation can be performed without using a strong acid and without requiring special equipment or harsh conditions.
[0019]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited at all by the following example.
[0020]
(Example 1)
Using polyethylene containing 49.2% by weight of magnesium hydroxide, a sheath was coated on the conductor by extrusion, and the molding loss material generated at that time was collected to obtain a test piece. Then, 30 g of the fine piece obtained by cutting the test piece was immersed in 500 ml of toluene at 50 ° C. for 4 hours for dissolution treatment, and the obtained processed product was subjected to solid-liquid separation using a centrifuge. Next, the separated solid was rewashed with toluene and dried to recover magnesium hydroxide. This series of operations was performed 5 times, and the recovery rate of magnesium hydroxide at each time (magnesium hydroxide amount relative to the total amount of the test piece: wt%) is shown in Table 1.
[0021]
[Table 1]
The average value of the five times of magnesium hydroxide recovery was 49.0% by weight, and this value was 99.6 with respect to the theoretical blending value (content of magnesium hydroxide in the forming raw material) of 49.2% by weight. %. From this. It can be seen that the present invention can recover metal hydroxide at an extremely high recovery rate.
[0023]
(Comparative Example 1)
According to Example 1, the same treatment was performed using isobutyl acetate (solubility parameter: 8.3) instead of toluene. The average recovery rate of magnesium hydroxide was 73.1%, which was lower than that of toluene in Example 1.
[0024]
(Comparative Example 2)
According to Example 1, the same treatment was performed using acetone (solubility parameter: 9.8) instead of toluene. The average recovery rate of magnesium hydroxide was 64.4%, which was lower than that of toluene in Example 1.
[0025]
【The invention's effect】
As described above, according to the present invention, it is possible to collect and recover metal hydroxides from non-halogen flame retardant molded articles safely and easily at a high recovery rate.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000018981A JP4115644B2 (en) | 2000-01-27 | 2000-01-27 | Method for recovering metal hydroxides from non-halogen flame retardant molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000018981A JP4115644B2 (en) | 2000-01-27 | 2000-01-27 | Method for recovering metal hydroxides from non-halogen flame retardant molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001206974A JP2001206974A (en) | 2001-07-31 |
| JP4115644B2 true JP4115644B2 (en) | 2008-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2000018981A Expired - Lifetime JP4115644B2 (en) | 2000-01-27 | 2000-01-27 | Method for recovering metal hydroxides from non-halogen flame retardant molded products |
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| Country | Link |
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| JP (1) | JP4115644B2 (en) |
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| JP2001206974A (en) | 2001-07-31 |
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