JP5774075B2 - Method for producing resin composition - Google Patents
Method for producing resin composition Download PDFInfo
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- JP5774075B2 JP5774075B2 JP2013233773A JP2013233773A JP5774075B2 JP 5774075 B2 JP5774075 B2 JP 5774075B2 JP 2013233773 A JP2013233773 A JP 2013233773A JP 2013233773 A JP2013233773 A JP 2013233773A JP 5774075 B2 JP5774075 B2 JP 5774075B2
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- 239000011342 resin composition Substances 0.000 title claims description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000010440 gypsum Substances 0.000 claims description 193
- 229910052602 gypsum Inorganic materials 0.000 claims description 193
- 239000002699 waste material Substances 0.000 claims description 147
- 239000000843 powder Substances 0.000 claims description 105
- 229920005992 thermoplastic resin Polymers 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 17
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 16
- 238000004898 kneading Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 10
- 238000010298 pulverizing process Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 150000004683 dihydrates Chemical class 0.000 description 21
- 238000010438 heat treatment Methods 0.000 description 15
- 239000008188 pellet Substances 0.000 description 12
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 9
- 230000018044 dehydration Effects 0.000 description 9
- 238000006297 dehydration reaction Methods 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 7
- 230000008025 crystallization Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 239000011162 core material Substances 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- -1 polypropylene Polymers 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 239000006148 magnetic separator Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000007872 degassing Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000009418 renovation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
Description
本発明は、石膏ボード廃材より得られる廃石膏粉末を含有する樹脂組成物の新規な製造方法に関する。詳しくは、上記廃石膏粉末を高い配合量で熱可塑性樹脂に配合する場合に、安定して配合操作を行うことができ、該廃石膏粉末を含有する高品質の樹脂組成物を得ることを可能とした、樹脂組成物の製造方法を提供するものである。 The present invention relates to a novel method for producing a resin composition containing waste gypsum powder obtained from gypsum board waste. Specifically, when the waste gypsum powder is blended into a thermoplastic resin in a high blending amount, the blending operation can be stably performed, and a high-quality resin composition containing the waste gypsum powder can be obtained. A method for producing a resin composition is provided.
石膏ボードは、石膏芯材の両面を紙で張り合わせた複合材料であり、現在、年間約４００万トン生産されている。それに対して、石膏ボード廃材は、年間約１５０万トン排出され、その排出量はさらに増加することが予想されている。該石膏ボード廃材の一部は、石膏ボードの再生原料や固化剤等にリサイクルされているものの、そのリサイクル率は低く、大半は埋立て処分されており、今後の石膏ボード廃材排出量の増加、国内の最終処分場の逼迫、環境負荷の点から、新たな石膏ボード廃材のリサイクル用途およびリサイクル方法が求められている。 The gypsum board is a composite material in which both sides of a gypsum core material are bonded together with paper, and is currently produced about 4 million tons per year. On the other hand, about 1.5 million tons of gypsum board waste material is discharged annually, and the discharge amount is expected to increase further. Although some of the waste gypsum board is recycled into gypsum board recycling materials, solidifying agents, etc., the recycling rate is low, and most of it is disposed of in landfills. In view of the tightness of final disposal sites in Japan and the environmental burden, new uses and methods of recycling waste gypsum board are required.
従来、二水石膏である廃石膏粉末の熱可塑性樹脂への配合を提案した例としては、廃石膏粉末、低密度ポリエチレン、木粉、熱可塑性エラストマーを押出機に投入して、１５０℃以下で混練して、ペレットを製造後、該ペレットと、熱可塑性樹脂と、発泡剤とをさらに押出機に投入して、１５０〜１９０℃の範囲で押し出して、押出発泡成形体を製造する方法が開示されている（特許文献１）。 Conventionally, as an example of proposed blending of waste gypsum powder, which is dihydrate gypsum, into thermoplastic resin, waste gypsum powder, low-density polyethylene, wood powder, thermoplastic elastomer are put into an extruder and the temperature is 150 ° C. or lower. Disclosed is a method for producing an extrusion foamed molded article by kneading and producing pellets, then adding the pellets, thermoplastic resin, and foaming agent to an extruder and extruding in a range of 150 to 190 ° C. (Patent Document 1).
しかしながら、特許文献１の方法において、熱可塑性樹脂への廃石膏粉末の配合割合が、５〜２０質量％と低いため、廃石膏粉末のリサイクル率が低いという問題を有する。 However, the method of Patent Document 1 has a problem that the recycling rate of waste gypsum powder is low because the proportion of the waste gypsum powder to the thermoplastic resin is as low as 5 to 20% by mass.
そこで、上記廃石膏粉末の配合量を増加することが考えられるが、かかる配合量を増加した場合、押出機内で廃石膏粉末の脱水による水蒸気が発生するという現象が起こることが判明した。特に、該廃石膏粉末との溶融混練に、１４０℃を超える温度が必要な熱可塑性樹脂を使用する場合、廃石膏粉末の脱水による水蒸気が大量に発生し、該水蒸気は、押出機の原料投入口まで逆流し、廃石膏粉末に付着して、廃石膏粉末は塊状物となり、原料投入口付近に付着するため、配合どおりの原料供給が困難となるという問題が生じる。さらに、該塊状物が落下して押出機内に混入し、押出機先端のメッシュを詰まらせ、成形体が得られない問題も発生する。たとえ、樹脂に配合することができたとしても、水蒸気により部分発泡した、外観性や、強度に劣る成形体しか得ることができないという問題を有する。 Accordingly, it is conceivable to increase the amount of the waste gypsum powder. However, when the amount is increased, it has been found that a phenomenon occurs in which water vapor is generated due to dehydration of the waste gypsum powder in the extruder. In particular, when a thermoplastic resin that requires a temperature exceeding 140 ° C. is used for melt-kneading with the waste gypsum powder, a large amount of water vapor is generated by dehydration of the waste gypsum powder, and the water vapor is input to the raw material of the extruder. Since the waste gypsum powder flows back to the mouth and adheres to the waste gypsum powder, the waste gypsum powder becomes a lump and adheres to the vicinity of the raw material charging port, so that there is a problem that it becomes difficult to supply the raw material as blended. Furthermore, the lump falls and mixes in the extruder, clogs the mesh at the tip of the extruder, and there is a problem that a molded body cannot be obtained. Even if it can be blended in the resin, there is a problem that only a molded body that is partially foamed with water vapor and has poor appearance and strength can be obtained.
従って、本発明の目的は、石膏ボード廃材を粉砕して得られる廃石膏粉末を熱可塑性樹脂に対して大量に配合し、１４０℃以上の高温で溶融混練して樹脂組成物を製造するに際し、前記メッシュの詰まりや配合どおりの原料供給が困難という問題を起こすことなく、安定して樹脂組成物を製造する方法を提供することにある。 Accordingly, an object of the present invention is to blend a large amount of waste gypsum powder obtained by pulverizing gypsum board waste material with respect to a thermoplastic resin, and melt knead at a high temperature of 140 ° C. or higher to produce a resin composition. An object of the present invention is to provide a method for stably producing a resin composition without causing the problem of clogging of the mesh and difficulty in supplying raw materials as blended.
本発明者は、上記目的を達成すべく鋭意研究を重ねた。その結果、上記条件下における廃石膏粉末の使用に際し、予め、該廃石膏粉末中の二水石膏の割合が、特定の値以下となるように、半水石膏及び／又は無水石膏に変換せしめておくことにより、溶融混練時に発生する水蒸気の影響を低減し、安定的に樹脂組成物を製造し得ることを見出し、本発明を完成するに至った。 The present inventor has intensively studied to achieve the above object. As a result, when using the waste gypsum powder under the above-mentioned conditions, it is previously converted into hemihydrate gypsum and / or anhydrous gypsum so that the proportion of dihydrate gypsum in the waste gypsum powder is below a specific value. Thus, the present inventors have found that the influence of water vapor generated during melt-kneading can be reduced and a resin composition can be stably produced, and the present invention has been completed.
即ち、本発明は、石膏ボード廃材を粉砕して得られる廃石膏粉末を熱可塑性樹脂１００質量部に対して、４０質量部以上を配合し、１４０℃以上で溶融混練して樹脂組成物を製造するに際し、
該廃石膏粉末として、半水石膏の割合が９０質量％以上の割合となるように調整された廃石膏粉末を使用することを特徴とする樹脂組成物の製造方法である。
That is, in the present invention, waste gypsum powder obtained by pulverizing gypsum board waste material is blended with 40 parts by mass or more with respect to 100 parts by mass of thermoplastic resin, and melt-kneaded at 140 ° C. or more to produce a resin composition When doing
As the waste gypsum powder, a waste gypsum powder adjusted so that the proportion of hemihydrate gypsum is 90% by mass or more is used.
また、上記廃石膏粉末は、石膏ボード廃材から得る際、ボード原紙の除去及び粉砕を乾式で行うことが、上記含水率を有する石膏とする加熱処理を効率よく行うために好ましい。即ち、本発明においては、石膏ボード廃材を乾式破砕してボード原紙を分離し、得られた破砕廃石膏を乾式粉砕して廃石膏粉末を得る方法が推奨される。
Moreover, when the said waste gypsum powder is obtained from gypsum board waste material, it is preferable to perform the removal and grinding | pulverization of board base paper by dry type, in order to perform the heat processing efficiently which makes the gypsum which has the said moisture content. That is, in the present invention, the gypsum board wastes are dry crushed to separate the board liner, a method of obtaining a waste gypsum powder and the resulting crushed waste gypsum and dry grinding is recommended.
本発明によれば、溶融混練の温度が比較的高い汎用の熱可塑性樹脂に対しても、廃石膏粉末を高充填しても、安定して樹脂組成物を得ることができる。そのため、廃石膏粉末のリサイクル率を飛躍的に増大することが可能であり、石膏ボード廃材の処理量の増加に大きく貢献することができる。 According to the present invention, a resin composition can be stably obtained even when a high-filling waste gypsum powder is used for a general-purpose thermoplastic resin having a relatively high melt kneading temperature. Therefore, it is possible to dramatically increase the recycling rate of waste gypsum powder, which can greatly contribute to an increase in the processing amount of gypsum board waste material.
特に、前記高温下での熱可塑性樹脂への溶融混練を、ベント式スクリュー押出機の如き押出機を用いて行う場合、押出機内での廃石膏粉末の脱水による水蒸気の発生量が抑制されるため、通常の脱気操作により、溶融混練を安定して実施することができ、上記押出機先端のメッシュの詰まり防止や、配合どおりの原料供給が可能となるなど、そのメリットは計り知れないものである。 In particular, when the melt kneading into the thermoplastic resin at a high temperature is performed using an extruder such as a vent type screw extruder, the amount of water vapor generated due to dehydration of the waste gypsum powder in the extruder is suppressed. The melt-kneading can be stably carried out by a normal degassing operation, and the merit is immeasurable such as prevention of clogging of the mesh at the tip of the extruder and the supply of raw materials as blended. is there.
さらに、廃石膏粉末には石膏ボード製造時に添加される界面活性剤等の添加剤が含まれており、該添加剤が熱可塑性樹脂との親和性を向上させ、特に、該添加剤が分解し得ない温度未満で、前記熱可塑性樹脂と溶融混練して、該廃石膏粉末を高充填する場合、市販されている試薬級の二水石膏を熱処理して二水石膏の割合を低減せしめた場合と比べ、得られる樹脂組成物の物性を向上させることができるという効果をも有する。 Furthermore, waste gypsum powder contains additives such as surfactants added during the production of gypsum board, and these additives improve the affinity with thermoplastic resins, and in particular the additives are decomposed. When melt-kneading with the thermoplastic resin at a temperature below an unobtainable temperature and highly filling the waste gypsum powder, heat treatment of commercially available reagent-grade dihydrate gypsum to reduce the proportion of dihydrate gypsum In comparison with the above, the physical properties of the obtained resin composition can be improved.
従って、本発明の樹脂組成物の製造方法によれば、リサイクルが困難な石膏ボード廃材を熱可塑性樹脂の充填剤として大量にリサイクルすることができ、その経済的効果、環境面における効果も極めて高い。 Therefore, according to the method for producing a resin composition of the present invention, it is possible to recycle a large amount of gypsum board waste material that is difficult to recycle as a filler of a thermoplastic resin, and its economic effect and environmental effect are extremely high. .
本発明において、処理の対象となる石膏ボード廃材は、石膏芯材の表面にボード原紙が付着したものであれば、特に制限されないが、厚みが９．５ｍｍ以上のものが一般的であり、かかる厚み以上の石膏ボード廃材に対して有効である。かかる石膏ボード廃材は、具体的には、石膏ボードの生産工程および建築現場で発生する端材、残材からなる石膏ボード廃材、リフォーム・解体工事で発生する石膏ボード廃材から得られるものが挙げられる。 In the present invention, the gypsum board waste material to be treated is not particularly limited as long as the board base paper adheres to the surface of the gypsum core material, but generally has a thickness of 9.5 mm or more. It is effective for gypsum board waste that is more than thick. Specific examples of such gypsum board waste materials include those obtained from gypsum board production processes and scraps generated at construction sites, gypsum board waste materials made of residual materials, and gypsum board waste materials generated in renovation and demolition work. .
尚、リフォーム・解体工事で発生する石膏ボード廃材には、ビス等の金属片が付着している。かかる金属片は、石膏ボード廃材の破砕時における破砕機の故障を招く恐れがあるため、破砕前に金属異物を磁選機により除去することが好ましい。 It should be noted that a piece of metal such as a screw is attached to the gypsum board waste material generated during the renovation and demolition work. Since such a metal piece may cause a failure of the crusher when crushing the gypsum board waste material, it is preferable to remove the metal foreign matter with a magnetic separator before crushing.
本発明において、石膏ボード廃材を破砕して廃石膏粉末を得る方法は、特に制限されるものではないが、石膏ボード廃材よりボード原紙を除去された状態で廃石膏粉末を得る方法が好ましい。特に、石膏ボード廃材を乾式破砕してボード原紙を分離し、得られた破砕廃石膏を乾式粉砕して廃石膏粉末を得る方法が推奨される。即ち、湿式で処理した場合、廃石膏粉末を再度乾燥させる必要があり、処理が煩雑となる。また、廃石膏粉末は粒径が小さいため、廃石膏粉末を含んだ溶液をろ過したろ過物は、ダイラタンシー現象を示し、該ろ過物を乾燥させるためには、多大なエネルギーを必要とする。 In the present invention, the method of obtaining waste gypsum powder by crushing gypsum board waste is not particularly limited, but a method of obtaining waste gypsum powder with the board base paper removed from the gypsum board waste is preferred. In particular, a method of dry crushing gypsum board waste to separate board base paper and dry crushing the obtained crush waste gypsum to obtain waste gypsum powder is recommended. That is, when wet processing is performed, it is necessary to dry the waste gypsum powder again, and the processing becomes complicated. In addition, since the waste gypsum powder has a small particle size, the filtrate obtained by filtering the solution containing the waste gypsum powder exhibits a dilatancy phenomenon, and a large amount of energy is required to dry the filtrate.
上記廃石膏粉末を得るための工程を更に詳細に説明すれば、先ず、石膏ボード廃材は、様々な大きさで回収された後、処理設備に搬入されるため、これを取り扱い易い適当な大きさに予備破砕することが好ましい。かかる予備破砕は、石膏の硬化体(芯材)は勿論、ボード原紙をも適当な大きさに破砕する破砕装置が好適に使用される。勿論、上記予備破砕も乾式で行うことが望ましい。具体的には、高速回転式衝撃破砕機、スクリューせん断式破砕機等が使用される。上記予備破砕後の破砕片の大きさは特に限定されないが、その後の破砕処理に投入する際の容易さを考慮して、廃石膏は粒径１５〜１００ｍｍ程度に、ボード原紙は５×１０−４〜０．０５ｍ２程度に破砕することが好ましい。 The process for obtaining the waste gypsum powder will be described in more detail. First, the gypsum board waste material is collected in various sizes and then carried into a processing facility. It is preferable to pre-crush. For such preliminary crushing, a crushing device that crushes not only the hardened gypsum (core material) but also the board base paper to an appropriate size is preferably used. Of course, it is desirable that the preliminary crushing is also performed in a dry manner. Specifically, a high-speed rotary impact crusher, a screw shear crusher, or the like is used. The size of the crushed pieces after the preliminary crushing is not particularly limited, but considering the ease of putting into the subsequent crushing treatment, the waste gypsum has a particle size of about 15 to 100 mm, and the board base paper has 5 × 10 − It is preferable to crush to about 4 to 0.05 m 2 .
本発明において、前記予備破砕処理により適当な大きさとされた石膏ボード廃材は、乾式破砕によりボード原紙を分離することが好ましい。上記乾式破砕は、芯材の石膏硬化体は破砕するが、ボード原紙を破砕し難い破砕装置を使用することが、ボード原紙を容易に除去するために好ましい。また、上記破砕処理は、芯材の石膏硬化体がボード原紙から脱離可能な大きさまで破砕することが好ましく、一般には、粗粉状、例えば、平均粒径５〜３０ｍｍ程度、好ましくは、１０〜２０ｍｍ程度の大きさとなるまで、破砕することが好ましい。 In the present invention, the gypsum board waste material having an appropriate size by the preliminary crushing treatment is preferably separated from the board base paper by dry crushing. In the dry crushing, although the hardened gypsum core material is crushed, it is preferable to use a crushing apparatus that does not crush the board base paper easily in order to easily remove the board base paper. In the crushing treatment, the hardened gypsum core material is preferably crushed to such a size that it can be detached from the base paper, and is generally coarse powder, for example, an average particle size of about 5 to 30 mm, preferably 10 It is preferable to crush until it becomes about 20 mm.
それ故、上記破砕処理は、圧縮式の破砕装置を使用することが好ましい。かかる破砕を行うための破砕装置は、工業的に入手可能なものを特に制限無く使用することができる。具体的には、ハンマーミル、ロールミル等が使用可能である。そして、かかる破砕装置で処理すれば、ボード原紙の大きさは殆ど変化することなく、ボード原紙より石膏を脱離させることができる。 Therefore, it is preferable that the crushing process uses a compression crushing apparatus. As the crushing apparatus for carrying out such crushing, an industrially available crushing apparatus can be used without particular limitation. Specifically, a hammer mill, a roll mill or the like can be used. And if it processes with this crushing apparatus, the magnitude | size of board base paper will be able to detach | desorb from board base paper, without changing almost.
そして、かかる破砕廃石膏は、公知の分離手段により、ボード原紙と容易に分離することが可能である。かかる分離手段としては、例えば、振動式、回転式の篩が挙げられる。かかる篩い目の大きさは、破砕廃石膏が通過でき、ボード原紙が通過し得ない大きさを選択すればよい。 And this crushing waste gypsum can be easily isolate | separated from a board base paper with a well-known separation means. Examples of such separation means include vibration type and rotary type sieves. The size of the sieve mesh may be selected such that the crushed waste gypsum can pass through and the board base paper cannot pass through.
本発明において、前記方法によって分離された破砕廃石膏を粉砕して廃石膏粉末を得る手段は特に制限されないが、一般には、高速回転衝撃粉砕機やジェットミルが使用される。かかる粉砕により得られる廃石膏粉末の粒径は、Ｄ５０：１〜１０μｍ、Ｄ９０：５〜２０μｍであることが、熱可塑性樹脂に配合するために好適である。 In the present invention, the means for pulverizing the crushed waste gypsum separated by the above method to obtain waste gypsum powder is not particularly limited, but generally, a high-speed rotary impact pulverizer or a jet mill is used. The particle size of the waste gypsum powder obtained by such pulverization is preferably D50: 1 to 10 μm and D90: 5 to 20 μm for blending with the thermoplastic resin.
本発明において、前記廃石膏粉末は、後で詳述する熱可塑性樹脂と溶融混練するに際し、二水石膏の割合が４０質量％以下の割合となるように調整されることが必要である。換言すれば、後述する方法により処理して含水率を低減させて、二水石膏の絶対量を少なくし、廃石膏粉末の６０質量％を超える割合の石膏を、半水石膏及び／又は無水石膏とすることが必要である。即ち、熱可塑性樹脂と溶融混練される廃石膏粉末において、二水石膏の割合が、４０質量％を超える場合、熱可塑性樹脂に高充填し、１４０℃以上の高温下で溶融混練を行う際の結晶水の脱離速度が早く、また、その量も多いことから、押出機のベントからの抜き出し量の限界を超え、上記押出機先端のメッシュの詰まりが起こったり、高い水蒸気圧により配合どおりの原料供給が困難となったりするという問題が発生する。本発明において好ましい二水石膏の割合は、特に、１０質量％以下が好ましい。 In the present invention, the waste gypsum powder needs to be adjusted so that the proportion of dihydrate gypsum is 40% by mass or less when melt-kneaded with a thermoplastic resin described in detail later. In other words, the water content is reduced by a method described later to reduce the absolute amount of dihydrate gypsum, and the gypsum in a proportion exceeding 60% by mass of the waste gypsum powder is hemihydrate gypsum and / or anhydrous gypsum. Is necessary. That is, in the waste gypsum powder melt-kneaded with the thermoplastic resin, when the proportion of dihydrate gypsum exceeds 40% by mass, the thermoplastic resin is highly filled, and when melt-kneading is performed at a high temperature of 140 ° C. or higher. The desorption rate of crystallization water is fast and the amount is too large, so it exceeds the limit of the extraction amount from the vent of the extruder, the clogging of the mesh at the tip of the extruder occurs, There arises a problem that it becomes difficult to supply raw materials. In the present invention, the proportion of dihydrate gypsum is particularly preferably 10% by mass or less.
上記廃石膏粉末において、二水石膏以外の石膏は、半水石膏及び／又は無水石膏であればよいが、本発明の目的を達成するためには、半水石膏の状態であれば十分であり、半水石膏が９０質量％以上存在することが特に好ましい。即ち、全ての結晶水を除いて無水石膏とするには、多大のエネルギーコストがかかり、工業的実施において不利となる。従って、廃石膏粉末における二水石膏以外の石膏は、半水石膏が一部又は全部を占めるように、廃石膏粉末の含水率の下限を決定することが好ましい。従って、廃石膏粉末の含水率は、０．５質量％以上、好ましくは、７質量％以上となるように調整することが好ましい。 In the waste gypsum powder, the gypsum other than dihydrate gypsum may be hemihydrate gypsum and / or anhydrous gypsum, but in order to achieve the object of the present invention, it is sufficient to be in the state of hemihydrate gypsum. It is particularly preferred that hemihydrate gypsum is present in an amount of 90 mass% or more. That is, it takes a lot of energy costs to make anhydrous gypsum except for all crystal water, which is disadvantageous in industrial implementation. Therefore, it is preferable to determine the lower limit of the moisture content of the waste gypsum powder so that the gypsum other than the dihydrate gypsum in the waste gypsum powder occupies part or all of the gypsum. Therefore, it is preferable to adjust the water content of the waste gypsum powder to 0.5% by mass or more, preferably 7% by mass or more.
本発明において、二水石膏の割合が４０質量％以下となるように調整された廃石膏粉末を得る方法は、少なくとも半水石膏となる温度、即ち、１２５℃以上、好ましくは、１３０〜５００℃、更に好ましくは、１３５〜２５０℃で廃石膏を加熱処理する方法が好適に採用される。また、加熱処理時間は、上記温度において、二水石膏が目的とする割合となるように適宜決定される。 In the present invention, the method for obtaining waste gypsum powder adjusted so that the proportion of dihydrate gypsum is 40% by mass or less is at least the temperature at which it becomes hemihydrate gypsum, that is, 125 ° C or higher, preferably 130 to 500 ° C. More preferably, a method of heat-treating waste gypsum at 135 to 250 ° C. is suitably employed. In addition, the heat treatment time is appropriately determined so that dihydrate gypsum has a target ratio at the above temperature.
尚、廃石膏粉末中の二水石膏の割合を調整するための加熱処理は、廃石膏の全てに対して実施する方法が一般的であるが、廃石膏の一部を加熱処理し、これを残部の未処理の廃石膏と混合することにより、得られる廃石膏粉末中の二水石膏の割合を前記範囲に調整してもよい。 The heat treatment for adjusting the proportion of dihydrate gypsum in the waste gypsum powder is generally carried out on all of the waste gypsum. You may adjust the ratio of the dihydrate gypsum in the obtained waste gypsum powder to the said range by mixing with the remainder untreated waste gypsum.
また、本発明において、上記廃石膏の加熱処理を行う時期は特に制限されず、石膏ボード廃材の状態で行なってもよいし、ボード原紙を除去後の破砕廃石膏の状態で行なってもよいし、更に、廃石膏粉末の状態で行なってもよい。しかし、加熱効率や均一な処理を行うことを考慮した場合、廃石膏粉末の状態で行うことが最も好ましい。 Further, in the present invention, the timing for performing the heat treatment of the waste gypsum is not particularly limited, and may be performed in the state of gypsum board waste material or in the state of crushed waste gypsum after removing the board base paper. Furthermore, it may be performed in the state of waste gypsum powder. However, in consideration of heating efficiency and uniform treatment, it is most preferable to carry out in the state of waste gypsum powder.
また、前記加熱処理の装置は、処理される廃石膏の大きさや形状等に合わせて適宜選択すればよい。例えば、廃石膏が塊状、粒状又は粉状である場合、ロータリードライヤーが、また、粒状又は粉状である場合、流動床等を使用して行うことが好ましい。 The heat treatment apparatus may be appropriately selected according to the size, shape, etc. of the waste gypsum to be treated. For example, when the waste gypsum is in the form of a lump, granule or powder, it is preferable to use a fluidized bed or the like when the rotary dryer is in the form of a granule or powder.
また、上記廃石膏の加熱処理においては、廃石膏を単独で加熱することが一般的であるが、熱可塑性樹脂の融点が、前記加熱処理の温度より高い場合は、該熱可塑性樹脂ペレットと混合して加熱を行うことも可能である。かかる態様において、廃石膏は、廃石膏粉末と同じ粒径の粉状とした状態で加熱処理することが好ましい。 Further, in the heat treatment of the waste gypsum, it is common to heat the waste gypsum alone, but when the melting point of the thermoplastic resin is higher than the temperature of the heat treatment, it is mixed with the thermoplastic resin pellets. It is also possible to perform heating. In such an embodiment, the waste gypsum is preferably heat-treated in a state of powder having the same particle size as the waste gypsum powder.
上記熱可塑性樹脂ペレットと廃石膏との混合は、工業的に入手可能なものを特に制限無く使用することができる。具体的には、ヘンシェルミキサーやブレンダー等の混合機が好適である。 For the mixing of the thermoplastic resin pellets and the waste gypsum, industrially available ones can be used without particular limitation. Specifically, a mixer such as a Henschel mixer or a blender is suitable.
本発明において、廃石膏粉末と溶融混練する熱可塑性樹脂は、ポリオレフィン樹脂、ポリエステル樹脂、ポリカーボネート樹脂、ポリアミド樹脂、フッ素樹脂、塩化ビニル樹脂等、溶融混練温度が１４０℃以上である、公知の熱可塑性樹脂が使用される。 In the present invention, the thermoplastic resin to be melt-kneaded with the waste gypsum powder is a known thermoplastic having a melt-kneading temperature of 140 ° C. or higher, such as polyolefin resin, polyester resin, polycarbonate resin, polyamide resin, fluororesin, and vinyl chloride resin. Resin is used.
本発明の方法は、廃石膏粉末を熱可塑性樹脂１００質量部に対して、４０〜１００質量部の範囲で配合し、１４０℃以上で溶融混練して樹脂組成物を製造する場合に有効である。即ち、従来、石膏ボード廃材を利用した樹脂組成物は、回収された廃石膏粉末をそのままの状態で樹脂に配合することが行なわれるため、使用する廃石膏粉末の量は少なく、また、溶融混練する樹脂の融点も比較的低いものが使用されていた。 The method of the present invention is effective when a resin composition is produced by blending waste gypsum powder in a range of 40 to 100 parts by mass with respect to 100 parts by mass of a thermoplastic resin and melting and kneading at 140 ° C. or higher. . That is, conventionally, a resin composition using gypsum board waste material is used by mixing the recovered waste gypsum powder into the resin as it is, so that the amount of waste gypsum powder to be used is small, and melt kneading is used. A resin having a relatively low melting point was used.
それ故、石膏ボード廃材由来の廃石膏粉末を使用し、熱可塑性樹脂１００質量部に対して、４０質量部以上という高い配合量で該廃石膏粉末を配合し、溶融混練温度が１４０℃以上という高い温度範囲を採用して樹脂組成物を製造する際に生じる前記問題は、従来技術から全く予測できなかった。 Therefore, waste gypsum powder derived from gypsum board waste material is used, the waste gypsum powder is blended at a high blending amount of 40 parts by mass or more with respect to 100 parts by mass of the thermoplastic resin, and the melt kneading temperature is 140 ° C. or more. The above-mentioned problems that occur when a resin composition is produced using a high temperature range could not be predicted from the prior art.
これに対して、本発明は、二水石膏の存在割合を前記特定量以下に調整した廃石膏粉末を使用することによって、廃石膏粉末を高充填し、高温度で熱可塑性樹脂と溶融混練する際のかかる問題を解消し、安定して溶融混練を行って生産性良く樹脂組成物を得ることができる。また、前記廃石膏粉末を得るための熱処理の温度を３００℃未満の低い温度で行なった場合には、予め廃石膏に含有される界面活性剤等の添加剤を残存させることができ、該廃石膏粉末と熱可塑性樹脂との親和性、延いては得られる樹脂組成物の物性の向上をもたらすことができる。 On the other hand, the present invention uses waste gypsum powder in which the proportion of dihydrate gypsum is adjusted to the specified amount or less so that the waste gypsum powder is highly filled and melt-kneaded with the thermoplastic resin at a high temperature. This problem can be solved, and the resin composition can be obtained with high productivity by stably performing melt-kneading. In addition, when the temperature of the heat treatment for obtaining the waste gypsum powder is performed at a low temperature of less than 300 ° C., additives such as surfactants contained in the waste gypsum can be left in advance, and the waste The affinity between the gypsum powder and the thermoplastic resin, and thus the physical properties of the resulting resin composition can be improved.
本発明において、廃石膏粉末と熱可塑性樹脂との溶融混練において使用される装置としては、一軸押出機、二軸押出機、３本以上のスクリューを備えたスクリュー押出機が好適に使用できるが、成形時に、押出機内で廃石膏粉末の脱水により発生する水蒸気を除去するため、脱気機能を備えたベント式のスクリュー押出機の使用が好適である。 In the present invention, as an apparatus used in melt kneading of waste gypsum powder and thermoplastic resin, a single screw extruder, a twin screw extruder, a screw extruder equipped with three or more screws can be suitably used. In order to remove water vapor generated by dehydration of waste gypsum powder in the extruder during molding, it is preferable to use a vent type screw extruder having a deaeration function.
また、廃石膏粉末と熱可塑性樹脂との混合物の押出機への供給は、ホッパーから押出機へ供給するか、供給に適した公知の供給装置を使用する方法が特に制限無く採用され、例えばスクリュー式フィーダー等を使用して供給することが好ましい。 In addition, as for the supply of the mixture of waste gypsum powder and thermoplastic resin to the extruder, a method using a known supply device suitable for the supply from the hopper or the supply is adopted without any particular limitation. It is preferable to supply using a formula feeder or the like.
本発明において、得られる樹脂組成物は、熱可塑性樹脂１００質量部に対して、４０質量部以上の廃石膏粉末を含むため、リサイクルが困難な石膏ボード廃材を熱可塑性樹脂の充填剤として大量にリサイクルでき、上記石膏ボード廃材の問題解決に寄与できる。 In the present invention, since the obtained resin composition contains 40 parts by mass or more of waste gypsum powder with respect to 100 parts by mass of the thermoplastic resin, a large amount of gypsum board waste material that is difficult to recycle is used as a filler for the thermoplastic resin. It can be recycled and can contribute to solving the problems of the above-mentioned waste gypsum board.
上記廃石膏粉末の配合量の上限は、樹脂組成物の物性等の制限により、１５０質量部以下とすることが好ましく、より好ましくは１００質量部以下とすることが好ましい。 The upper limit of the amount of the waste gypsum powder is preferably 150 parts by mass or less, more preferably 100 parts by mass or less, due to limitations such as physical properties of the resin composition.
図１は、本発明の樹脂組成物の製造方法の一態様を示す概略図である。図１に示すように、石膏ボード廃材１をホッパー２に投入し、必要に応じて、磁選機３により、金属片の異物を除去した後、一軸衝撃破砕機４で、例えば、０．０１ｍ２程度の大きさに石膏ボード廃材を予備粉砕される。得られた破砕片をロールミル５に投入し、例えば廃石膏を粒径１０ｍｍ以下に破砕する。次いで、篩い目１５ｍｍのトロンメル６に投入して、破砕廃石膏とボード原紙７とに分離する。
FIG. 1 is a schematic view showing one embodiment of a method for producing a resin composition of the present invention. As shown in FIG. 1, the gypsum board waste material 1 is put into a hopper 2, and if necessary, after removing foreign matter from the metal pieces by a magnetic separator 3, the
破砕廃石膏はジェットミル８に投入し、例えばＤ５０：１〜１０μｍ、Ｄ９０：５〜２０μｍに粉砕し、得られる廃石膏粉末を集塵機９で捕集した後、貯蔵サイロ１０に送る。
The crushed waste gypsum is put into the
次いで、上記廃石膏粉末をロータリードライヤー１１に投入し、該廃石膏粉末の６０質量％を超える割合の石膏を、半水石膏及び／又は無水石膏とした後、該廃石膏粉末を熱可塑性樹脂とヘンシェルミキサー１２で混合する。なお、熱可塑性樹脂の融点が１４０℃以上の場合は、廃石膏粉末と該熱可塑性樹脂を一緒にヘンシェルミキサー１２に投入し、加熱しながら混合して、該廃石膏粉末の６０質量％を超える割合の石膏を、半水石膏及び／又は無水石膏としてもよい。前記加熱・混合処理された廃石膏粉末と熱可塑性樹脂の混合物をホッパー１３に投入し、スクリュー式フィーダー１４よりベント式スクリュー押出機１５に供給して溶融混練した後、押出成形体を空冷もしくは水冷して樹脂組成物１６を得る。
Next, the waste gypsum powder is put into the
以下、実施例によって本発明をさらに詳細に説明するが、本発明はこれらの実施例に限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples.
尚、石膏の平均含水率は、熱重量分析装置により重量減少率を測定して求めた。 The average water content of gypsum was determined by measuring the weight reduction rate with a thermogravimetric analyzer.
参考例１
細田企画製プラスターボシリーズにて石膏ボード廃材の破砕、廃石膏粉末とボード原紙との分離を行った。次いで、廃石膏粉末をジェットミル（ホソカワミクロン製カウンタージェットミルＡＦＧ２００）でさらに粉砕し、Ｄ５０：３μｍ、Ｄ９０：８μｍの廃石膏粉末を得た。次いで、該廃石膏粉末４３質量部とポリプロピレン（プライムポリマー製プライムポリプロＪ７１５Ｍ）１００質量部をヘンシェルミキサーに投入し、加熱温度を１３５℃に設定して、２０分間混合した。
Reference example 1
Crushing gypsum board waste material and separating gypsum powder from board base paper with Hosoda Planning Plus Turbo series. Next, the waste gypsum powder was further pulverized by a jet mill (counter jet mill AFG200 manufactured by Hosokawa Micron Corporation) to obtain waste gypsum powder of D50: 3 μm and D90: 8 μm. Next, 43 parts by mass of the waste gypsum powder and 100 parts by mass of polypropylene (Prime Polypro J715M manufactured by Prime Polymer) were charged into a Henschel mixer, and the heating temperature was set to 135 ° C. and mixed for 20 minutes.
上記加熱処理によって得られた廃石膏粉末について、二水石膏の割合は３２質量％、半水石膏及び／又は無水石膏の割合は６８質量％であり、その平均含水率は、１１．２質量％であった。また、上記含水率測定時の重量減少率曲線より、石膏粉末中の半水石膏の割合は、６８質量％であった。 About the waste gypsum powder obtained by the said heat processing, the ratio of dihydrate gypsum is 32 mass%, the ratio of hemihydrate gypsum and / or anhydrous gypsum is 68 mass%, The average moisture content is 11.2 mass%. Met. Further, from the weight loss rate curve at the time of measuring the moisture content, the proportion of hemihydrate gypsum in the gypsum powder was 68% by mass.
該混合物をホッパーに投入し、スクリュー式フィーダーを使用して、１１０ｍｍΦベント式二軸押出機（池貝製ＧＴ１１０）に該混合物を投入し、１８０℃〜２１０℃の範囲で、脱気しながらストランド状に押し出した。次いで水槽でストランドを水冷した後、カットしてペレットを得た。 The mixture is put into a hopper, and the mixture is put into a 110 mmΦ vented twin screw extruder (Ikegai GT110) using a screw feeder, and in the form of a strand while degassing in a range of 180 ° C to 210 ° C. Extruded to. Next, the strand was cooled with water in a water tank and then cut to obtain pellets.
その結果、廃石膏粉末の脱水により、押出機内で発生した水蒸気は脱気され、安定的にストランドが得られた。得られたペレットは発泡せず、廃石膏粉末の分散も良好であった。 As a result, the water vapor generated in the extruder was degassed by dehydration of the waste gypsum powder, and a strand was stably obtained. The obtained pellets were not foamed and the dispersion of the waste gypsum powder was good.
ＪＩＳＫ７１２１に従い、得られたペレットの結晶化温度を測定した。さらに、得られたペレットから試験片を作製し、曲げ試験を行った。曲げ試験は、ＪＩＳＫ ７１７１に従い行った。その結果を表１に示す。 According to JISK7121, the crystallization temperature of the obtained pellet was measured. Furthermore, a test piece was produced from the obtained pellet and subjected to a bending test. The bending test was performed according to JISK 7171. The results are shown in Table 1.
参考例２
参考例１において、ポリプロピレン１００質量部に対して、廃石膏粉末を１００質量部使用した以外は、実施例１と同様の操作を行い、樹脂組成物を得た。
Reference example 2
In Reference Example 1, a resin composition was obtained in the same manner as in Example 1 except that 100 parts by mass of waste gypsum powder was used with respect to 100 parts by mass of polypropylene.
その結果、廃石膏粉末の脱水により、押出機内で発生した水蒸気は脱気され、安定的に樹脂組成物のストランドが得られた。また、得られたペレットは発泡せず、廃石膏粉末の分散も良好であった。得られた樹脂組成物の結晶化温度等の評価結果を表１に示す。 As a result, the water vapor generated in the extruder was degassed by dehydration of the waste gypsum powder, and a strand of the resin composition was stably obtained. Moreover, the obtained pellet did not foam, and the dispersion | distribution of waste gypsum powder was also favorable. Table 1 shows the evaluation results such as the crystallization temperature of the obtained resin composition.
実施例１
参考例２において、上記加熱処理条件を変えることにより、二水石膏の割合が８質量％、半水石膏及び／又は無水石膏の割合が９２質量％であり、その平均含水率が、８．２質量％の廃石膏粉末を使用した以外は同様にして樹脂組成物を得た。
Example 1
In Reference Example 2, by changing the heat treatment conditions, the proportion of dihydrate gypsum was 8% by mass, the proportion of hemihydrate gypsum and / or anhydrous gypsum was 92% by mass, and the average moisture content was 8.2. A resin composition was obtained in the same manner except that the mass% waste gypsum powder was used.
また、上記含水率測定時の重量減少率曲線より、石膏粉末中の半水石膏の割合は、９２質量％であった。 Further, from the weight loss rate curve at the time of measuring the moisture content, the proportion of hemihydrate gypsum in the gypsum powder was 92% by mass.
その結果、廃石膏粉末の脱水により、押出機内で発生した水蒸気は脱気され、安定的に樹脂組成物のストランドが得られた。また、得られたペレットは発泡せず、廃石膏粉末の分散も良好であった。得られた樹脂組成物の結晶化温度等の評価結果を表１に示す。 As a result, the water vapor generated in the extruder was degassed by dehydration of the waste gypsum powder, and a strand of the resin composition was stably obtained. Moreover, the obtained pellet did not foam, and the dispersion | distribution of waste gypsum powder was also favorable. Table 1 shows the evaluation results such as the crystallization temperature of the obtained resin composition.
実施例２
参考例２において、上記加熱処理条件を変えることにより、二水石膏の割合が０質量％、半水石膏及び／又は無水石膏の割合が１００質量％であり、その平均含水率が、７．２質量％の廃石膏粉末を使用した以外は同様にして樹脂組成物を得た。
Example 2
In Reference Example 2, by changing the heat treatment conditions, the proportion of dihydrate gypsum was 0% by mass, the proportion of hemihydrate gypsum and / or anhydrous gypsum was 100% by mass, and the average moisture content was 7.2. A resin composition was obtained in the same manner except that the mass% waste gypsum powder was used.
また、上記含水率測定時の重量減少率曲線より、石膏粉末中の半水石膏の割合は、１００質量％であった。 Moreover, the ratio of the hemihydrate gypsum in a gypsum powder was 100 mass% from the weight reduction rate curve at the time of the said moisture content measurement.
その結果、廃石膏粉末の脱水により、押出機内で発生した水蒸気は脱気され、安定的に樹脂組成物のストランドが得られた。また、得られたペレットは発泡せず、廃石膏粉末の分散も良好であった。得られた樹脂組成物の結晶化温度等の評価結果を表１に示す。 As a result, the water vapor generated in the extruder was degassed by dehydration of the waste gypsum powder, and a strand of the resin composition was stably obtained. Moreover, the obtained pellet did not foam, and the dispersion | distribution of waste gypsum powder was also favorable. Table 1 shows the evaluation results such as the crystallization temperature of the obtained resin composition.
参考例３
実施例１において、廃石膏粉末を配合しない状態のポリプロピレンの結晶化温度の測定、曲げ試験を行った。結果を表２に示す。
Reference example 3
In Example 1, the measurement of the crystallization temperature of a polypropylene in a state where the waste gypsum powder was not blended and a bending test were performed. The results are shown in Table 2.
比較例１
参考例１において、加熱処理を行わなかった廃石膏粉末４３質量部とポリプロピレン１００質量部をヘンシェルミキサーに投入し、加熱せずに室温で２０分間混合した。該混合物をベント式二軸押出機に投入したが、廃石膏粉末の脱水により、大量の水蒸気が押出機内で発生し、該水蒸気が原料投入口に逆流して、水分が付着した石膏が塊状となって原料投入口に付着し、押出機への配合どおりの原料供給が不可能であった。また、塊状の石膏が押出機内に混入し、押出機先端のメッシュを詰まらせ、ストランドが得られなかった。押出機のメッシュをはずして、再度押出成形を試みたが、ダイスの吐出口が詰まり、ストランドが安定的に得られなかった。
Comparative Example 1
In Reference Example 1, 43 parts by mass of waste gypsum powder and 100 parts by mass of polypropylene that were not heat-treated were put into a Henschel mixer and mixed at room temperature for 20 minutes without heating. The mixture was put into a vent type twin screw extruder, but due to the dehydration of the waste gypsum powder, a large amount of water vapor was generated in the extruder, the water vapor flowed back to the raw material inlet, and the gypsum adhered with water became a lump. Thus, it adhered to the raw material charging port, and it was impossible to supply the raw material as blended to the extruder. In addition, massive gypsum was mixed in the extruder, clogging the mesh at the tip of the extruder, and no strands were obtained. The extrusion mesh was removed and extrusion molding was attempted again. However, the discharge port of the die was clogged, and the strand could not be stably obtained.
参考例４
参考例１において、廃石膏粉末に代えて、市販の試薬二水石膏をジェットミルで粉砕し
て、Ｄ５０：４μｍ、Ｄ９０：８μｍに調製し、ポリプロピレン１００質量部に対して、
４３質量部使用した以外は、参考例１と同様の操作を行った。
Reference example 4
In Reference Example 1, instead of waste gypsum powder, commercially available reagent dihydrate gypsum was pulverized with a jet mill to prepare D50: 4 μm, D90: 8 μm, and 100 parts by mass of polypropylene,
The same operation as in Reference Example 1 was performed except that 43 parts by mass was used.
試薬二水石膏粉末の脱水により、押出機内で発生した水蒸気は脱気され、安定的にストランドが得られた。得られたペレットは発泡せず、試薬二水石膏粉末の分散も良好であった。得られた樹脂組成物の結晶化温度等の評価結果を表２に示す。 By dehydrating the reagent dihydrate gypsum powder, water vapor generated in the extruder was degassed, and a strand was stably obtained. The obtained pellets were not foamed and the dispersion of the reagent dihydrate gypsum powder was good. Table 2 shows evaluation results such as the crystallization temperature of the obtained resin composition.
１：石膏ボード廃材
２：ホッパー
３：磁選機
４：一軸破砕機
５：ロールミル
６：トロンメル
７：ボード原紙
８：ジェットミル
９：集塵機
１０：サイロ
１１：ロータリードライヤー
１２：ヘンシェルミキサー
１３：ホッパー
１４：スクリュー式フィーダー
１５：ベント式スクリュー押出機
１６：樹脂組成物
1: Gypsum board waste 2: Hopper 3: Magnetic separator 4: Uniaxial crusher
5: Roll mill 6: Trommel 7: Board base paper 8: Jet mill 9: Dust collector 10: Silo 11: Rotary dryer 12: Henschel mixer 13: Hopper 14: Screw type feeder 15: Vent type screw extruder 16: Resin composition
Claims (2)
該廃石膏粉末として、半水石膏の割合が９０質量％以上の割合となるように調整された廃石膏粉末を使用することを特徴とする樹脂組成物の製造方法。 When producing a resin composition by blending 40 parts by mass or more of waste gypsum powder obtained by pulverizing gypsum board waste material with respect to 100 parts by mass of the thermoplastic resin, melting and kneading at 140 ° C. or more,
A method for producing a resin composition, characterized in that as the waste gypsum powder, waste gypsum powder adjusted so that the proportion of hemihydrate gypsum is 90% by mass or more is used.
Method of producing the gypsum powder, a gypsum board wastes separating board liner and dry crushing, the resulting disruption waste gypsum is obtained by dry crushing claim 1 resin composition.
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