JP2016069543A - Pulp content resin molded article and producing method thereof - Google Patents
Pulp content resin molded article and producing method thereof Download PDFInfo
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本発明は、パルプ繊維を含有するものでありながら表面光沢及び耐久性に優れる成型品を得ることが可能なパルプ含有樹脂成型品に関するものである。 The present invention relates to a pulp-containing resin molded article that can obtain a molded article having excellent surface gloss and durability while containing pulp fibers.
プラスチック容器等の成型原料としては、石油を原料とする熱可塑性合成樹脂が用いられているが、廃材リサイクルや廃棄性（我が国ではパルプ含有量によって可燃ゴミとできる場合がある）の観点から、古紙等に由来するパルプ繊維と熱可塑性合成樹脂との混合物も用いられてきた（例えば特許文献１〜５参照）。 Thermoplastic synthetic resin made from petroleum is used as a raw material for molding plastic containers and the like, but from the viewpoint of waste material recycling and disposal (in Japan, it may be combustible waste depending on pulp content), waste paper Mixtures of pulp fibers derived from the like and thermoplastic synthetic resins have also been used (see, for example, Patent Documents 1 to 5).
しかしながら、パルプ含有樹脂成型品は、熱可塑性合成樹脂単独の成型品と比較して、表面光沢及び耐久性が少なからず劣るという問題点があった。この問題点は、パルプ繊維含有量を低く抑えることにより改善できるが、廃材リサイクルや廃棄性の観点からはより多くのパルプ繊維を混合することが望まれる。 However, the pulp-containing resin molded product has a problem that the surface gloss and durability are inferior to those of the molded product of the thermoplastic synthetic resin alone. Although this problem can be improved by keeping the pulp fiber content low, it is desirable to mix more pulp fibers from the viewpoint of waste recycling and disposal.
そこで、本発明の主たる課題は、パルプ含有樹脂成型品における表面光沢及び耐久性を向上することにある。 Then, the main subject of this invention is improving the surface glossiness and durability in a pulp containing resin molding.
上記課題を解決した本発明は次記のとおりである。 The present invention that has solved the above problems is as follows.
＜請求項１記載の発明＞
パルプ繊維と、高吸収性ポリマーと、この高吸収性ポリマーとは異なる熱可塑性樹脂とを含有することを特徴とするパルプ含有樹脂成型品。
<Invention of Claim 1>
A pulp-containing resin molded article comprising pulp fiber, a superabsorbent polymer, and a thermoplastic resin different from the superabsorbent polymer.
（作用効果）
使い捨ておむつや、生理用ナプキン等の吸収性物品の製造に際しては、製造時に品質基準外で廃棄処分となる製品等については素材リサイクルの要望があるにもかかわらず、吸収体のパルプ繊維のリサイクル技術が確立されていないという現状がある。これは、一般的な吸収体にはパルプ繊維だけでなく、高吸収性ポリマーが含有されていることも原因となっている。本発明者は、吸収体のパルプ繊維のリサイクルとしてパルプ含有樹脂成型品への応用を検討した際に、吸収体から回収したパルプ繊維に不可避的に残留する高吸収性ポリマーの影響を調べたところ、表面光沢及び耐久性の向上という望外な好影響があるという知見を得て本発明をなすにいたったものである。すなわち、本発明は、パルプ繊維及び熱可塑性樹脂に加えて高吸収性ポリマーを混合することにより、パルプ含有樹脂成型品における表面光沢及び耐久性を向上する（換言すれば同じパルプ含有量であれば高吸収性ポリマーを含有しないものよりも表面光沢及び耐久性に優れたものとなる）というものである。
(Function and effect)
Technology for recycling absorbent fibers such as disposable diapers and sanitary napkins, even though there is a demand for material recycling for products that are disposed of outside the quality standards at the time of manufacture. There is a current situation that has not been established. This is due to the fact that general absorbents contain not only pulp fibers but also superabsorbent polymers. The present inventor examined the influence of the superabsorbent polymer inevitably remaining in the pulp fiber recovered from the absorber when considering the application to the pulp-containing resin molded product as the recycling of the pulp fiber of the absorber. The present invention has been made by obtaining the knowledge that there is an unexpected positive effect of improving surface gloss and durability. That is, the present invention improves the surface gloss and durability of a pulp-containing resin molded product by mixing a superabsorbent polymer in addition to pulp fibers and a thermoplastic resin (in other words, if the pulp content is the same). The surface gloss and durability are superior to those not containing the superabsorbent polymer).
＜請求項２記載の発明＞
前記高吸収性ポリマーが、ポリアクリル酸塩系高吸収性ポリマー、ポリスルホン酸塩系高吸収性ポリマー、無水マレイン酸塩系高吸収性ポリマー、ポリアクリルアミド系高吸収性ポリマー、ポリビニルアルコール系高吸収性ポリマー、ポリアスパラギン酸系高吸収性ポリマー、ポリグルタミン酸塩系高吸収性ポリマー、ポリアルギン酸塩系高吸収性ポリマー、デンプン系高吸収性ポリマー、及びセルロース系の群から選択された一種又は二種以上の高吸収性ポリマーである、請求項１記載のパルプ含有樹脂成型品。
<Invention of Claim 2>
The superabsorbent polymer is polyacrylate-based superabsorbent polymer, polysulfonate-based superabsorbent polymer, maleic anhydride-based superabsorbent polymer, polyacrylamide-based superabsorbent polymer, polyvinyl alcohol-based superabsorbent. One or more selected from the group consisting of polymer, polyaspartic acid-based superabsorbent polymer, polyglutamate-based superabsorbent polymer, polyalginate-based superabsorbent polymer, starch-based superabsorbent polymer, and cellulose-based polymer The pulp-containing resin molded product according to claim 1, which is a superabsorbent polymer.
（作用効果）
本発明の高吸収性ポリマーとしてはこれらのものを好適に用いることができる。特に入手性の点で、汎用されているポリアクリル酸塩系高吸収性ポリマーが好ましい。
(Function and effect)
These can be suitably used as the superabsorbent polymer of the present invention. In particular, a polyacrylate highly absorbent polymer that is widely used is preferable from the viewpoint of availability.
＜請求項３記載の発明＞
前記パルプ繊維及び高吸収性ポリマーは、吸収性物品の吸収体から回収されたものである、請求項１又は２記載のパルプ含有樹脂成型品。
<Invention of Claim 3>
The pulp-containing resin molded product according to claim 1 or 2, wherein the pulp fiber and the superabsorbent polymer are recovered from the absorbent body of the absorbent article.
（作用効果）
本発明のパルプ繊維及び高吸収性ポリマーの由来は特に限定されないが、使い捨ておむつや生理用ナプキン等の吸収性物品の吸収体は、パルプ繊維及び高吸収性ポリマーを含有するものが一般的であるとともに、前述のように吸収体のリサイクル技術が確立されていない現状がある。よって、本発明のパルプ繊維及び高吸収性ポリマーは吸収性物品の吸収体から回収したものであると好ましい。
(Function and effect)
The origin of the pulp fiber and superabsorbent polymer of the present invention is not particularly limited, but absorbent bodies of absorbent articles such as disposable diapers and sanitary napkins generally contain pulp fiber and superabsorbent polymer. At the same time, as described above, there is a situation where the recycling technology of the absorber has not been established. Therefore, it is preferable that the pulp fiber and superabsorbent polymer of the present invention are those recovered from the absorbent body of the absorbent article.
＜請求項４記載の発明＞
前記高吸収性ポリマーとは異なる熱可塑性樹脂は、オレフィン系樹脂、ポリエステル系樹脂、及びポリアミド系樹脂の少なくとも一種である、請求項１〜３のいずれか１項に記載のパルプ含有樹脂成型品。
<Invention of Claim 4>
The pulp-containing resin molded article according to any one of claims 1 to 3, wherein the thermoplastic resin different from the superabsorbent polymer is at least one of an olefin resin, a polyester resin, and a polyamide resin.
（作用効果）
高吸収性ポリマーとは異なる熱可塑性樹脂としては、これらの樹脂を好適に用いることができる。
(Function and effect)
These resins can be suitably used as the thermoplastic resin different from the superabsorbent polymer.
＜請求項５記載の発明＞
前記パルプ含有樹脂成型品における前記パルプ繊維及び高吸収性ポリマーの合計含有量が１０〜６０重量％であり、
前記パルプ含有樹脂成型品における前記高吸収性ポリマーとは異なる熱可塑性樹脂の含有量が４０〜９０重量％であり、
前記パルプ繊維及び高吸収性ポリマーの合計含有量中のパルプ繊維含有量が６５〜９９．９重量％であり、
前記パルプ繊維及び高吸収性ポリマーの合計含有量中の高吸収性ポリマー含有量が０．１〜３５重量％である、
請求項１〜４のいずれか１項に記載のパルプ含有樹脂成型品。
<Invention of Claim 5>
The total content of the pulp fiber and superabsorbent polymer in the pulp-containing resin molded product is 10 to 60% by weight,
The content of the thermoplastic resin different from the superabsorbent polymer in the pulp-containing resin molded product is 40 to 90% by weight,
The pulp fiber content in the total content of the pulp fiber and the superabsorbent polymer is 65 to 99.9% by weight,
The superabsorbent polymer content in the total content of the pulp fiber and superabsorbent polymer is 0.1 to 35% by weight,
The pulp-containing resin molded product according to any one of claims 1 to 4.
（作用効果）
パルプ含有量が少なすぎると、リサイクル効率が悪くなり、多すぎると表面光沢及び耐久性が低下する。また、高吸収性ポリマー含有量が少なすぎると、表面光沢及び耐久性の改善効果が弱くなり、また一定量以上になると表面光沢及び耐久性の改善効果が飽和するだけでなく、高吸収性ポリマー単独で再利用した方が費用対効果に優れるようになる。
(Function and effect)
If the pulp content is too low, the recycling efficiency will be poor, and if it is too high, the surface gloss and durability will be reduced. In addition, if the content of the superabsorbent polymer is too small, the effect of improving the surface gloss and durability becomes weak, and if it exceeds a certain amount, not only the effect of improving the surface gloss and durability is saturated, but also the superabsorbent polymer. Reusing it alone is more cost effective.
＜請求項６記載の発明＞
容器本体と、容器本体内の収容物を取り出すために開閉する開閉蓋とを有する容器である、請求項１〜５のいずれか１項に記載のパルプ含有樹脂成型品。
<Invention of Claim 6>
The pulp-containing resin molded product according to any one of claims 1 to 5, wherein the pulp-containing resin molded product is a container having a container main body and an opening / closing lid that opens and closes to take out the contents in the container main body.
（作用効果）
開閉蓋を有する容器のように、可動部がある場合には、耐久性が重要になるため、本発明の適用が特に好ましいものである。
(Function and effect)
Since durability becomes important when there is a movable part like a container having an open / close lid, the application of the present invention is particularly preferable.
＜請求項７記載の発明＞
パルプ繊維と、高吸収性ポリマーと、この高吸収性ポリマーとは異なる熱可塑性樹脂とを含有する原料を用いて成型する、ことを特徴とするパルプ含有樹脂成型品の製造方法。
<Invention of Claim 7>
A method for producing a pulp-containing resin molded product, characterized by molding using a raw material containing pulp fiber, a superabsorbent polymer, and a thermoplastic resin different from the superabsorbent polymer.
（作用効果）
請求項１記載の発明と同様の作用効果を奏する。
(Function and effect)
The same effects as those of the first aspect of the invention can be achieved.
＜請求項８記載の発明＞
吸収性物品の吸収体から回収したパルプ繊維及び高吸収性ポリマーと、この高吸収性ポリマーとは異なる熱可塑性樹脂とを含有する原料を用いて成型する、ことを特徴とするパルプ含有樹脂成型品の製造方法。
<Invention of Claim 8>
A pulp-containing resin molded product, which is molded using a raw material containing pulp fibers and a superabsorbent polymer recovered from an absorbent body of an absorbent article, and a thermoplastic resin different from the superabsorbent polymer. Manufacturing method.
（作用効果）
請求項３記載の発明と同様の作用効果を奏する。
(Function and effect)
The same effects as those of the third aspect of the invention can be achieved.
以上のとおり、本発明によれば、パルプ含有樹脂成型品における表面光沢及び耐久性が向上するようになる、等の利点がもたらされる。 As described above, according to the present invention, advantages such as improved surface gloss and durability in a pulp-containing resin molded product are brought about.
以下、本発明の実施形態について詳説する。 Hereinafter, embodiments of the present invention will be described in detail.
本発明は、パルプ繊維と、高吸収性ポリマーと、この高吸収性ポリマーとは異なる熱可塑性樹脂とを含有することを特徴とするパルプ含有樹脂成型品である。 The present invention is a pulp-containing resin molded article comprising pulp fibers, a superabsorbent polymer, and a thermoplastic resin different from the superabsorbent polymer.
パルプ繊維としては、グランドウッドパルプ（ＧＰ）・プレッシャーライズドグランドウッドパルプ（ＰＧＷ）・サーモメカニカルパルプ（ＴＭＰ）等の機械パルプ、セミケミカルパルプ（ＣＰ）、針葉樹未晒クラフトパルプ（ＮＵＫＰ）・針葉樹高歩留り未晒クラフトパルプ（ＨＮＫＰ）・針葉樹晒クラフトパルプ（ＮＢＫＰ）・広葉樹未晒クラフトパルプ（ＬＵＫＰ）・広葉樹晒クラフトパルプ（ＬＢＫＰ）等の化学パルプ、ならびにデインキングパルプ（ＤＩＰ）・ウェイストパルプ（ＷＰ）等の古紙パルプ、ケナフ・竹・麻・藁等由来の非木材パルプのうち、一種または二種以上を選択して用いることができる。 Pulp fibers include mechanical pulp such as groundwood pulp (GP), pressure-rise groundwood pulp (PGW), and thermomechanical pulp (TMP), semi-chemical pulp (CP), unbleached kraft pulp (NUKP), and conifer High yield unbleached kraft pulp (HNKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), hardwood bleached kraft pulp (LBKP) Among waste paper pulps such as WP) and non-wood pulps derived from kenaf, bamboo, hemp, straw, etc., one or more can be selected and used.
高吸収性ポリマーとしては、ポリアクリル酸塩系高吸収性ポリマー、ポリスルホン酸塩系高吸収性ポリマー、無水マレイン酸塩系高吸収性ポリマー、ポリアクリルアミド系高吸収性ポリマー、ポリビニルアルコール系高吸収性ポリマー、ポリアスパラギン酸系高吸収性ポリマー、ポリグルタミン酸塩系高吸収性ポリマー、ポリアルギン酸塩系高吸収性ポリマー、デンプン系高吸収性ポリマー、及びセルロース系の群から選択された一種又は二種以上のものを好適に用いることができる。特に入手性の点で、汎用されているポリアクリル酸塩系高吸収性ポリマーが好ましい。 As the superabsorbent polymer, polyacrylate-based superabsorbent polymer, polysulfonate-based superabsorbent polymer, maleic anhydride-based superabsorbent polymer, polyacrylamide-based superabsorbent polymer, polyvinyl alcohol-based superabsorbent One or more selected from the group consisting of polymer, polyaspartic acid-based superabsorbent polymer, polyglutamate-based superabsorbent polymer, polyalginate-based superabsorbent polymer, starch-based superabsorbent polymer, and cellulose-based polymer Can be preferably used. In particular, a polyacrylate highly absorbent polymer that is widely used is preferable from the viewpoint of availability.
パルプ繊維の由来は特に限定されず、製紙における損紙や、古紙等の紙由来の物でも良いが、他の樹脂との混合性を高めるには離解処理あるいは粉砕処理を十分に行う必要がある。これに対して、使い捨ておむつや生理用ナプキン等の吸収性物品の吸収体は、均質で砕けやすいパルプ繊維の集合体となっているものが一般的であるため、これを回収して用いると混合性の点でも、処理の容易性の点でも好ましいものとなる。また、高吸収性ポリマーについても、その由来は限定されず、パルプ繊維とは別に用意することもできるが、吸収性物品の吸収体は、パルプ繊維及び高吸収性ポリマーが混合状態となっているものが一般的であるため、これをそのまま、又は高吸収性ポリマーを適宜回収した後の、高吸収性ポリマーが残留するパルプ繊維を、原料として用いると好ましい。パルプ繊維と高吸収性ポリマーとの混合処理が必要無くなるため好ましい。 The origin of the pulp fiber is not particularly limited, and it may be a waste paper in papermaking or a thing derived from paper such as waste paper, but it is necessary to sufficiently perform a disaggregation process or a pulverization process in order to improve the mixing property with other resins. . On the other hand, since absorbent bodies of absorbent articles such as disposable diapers and sanitary napkins are generally aggregates of pulp fibers that are homogeneous and easily crushed, mixing them when recovered and used From the standpoint of performance and ease of processing, this is preferable. Also, the origin of the superabsorbent polymer is not limited and can be prepared separately from the pulp fiber, but the absorbent article of the absorbent article is in a mixed state of the pulp fiber and the superabsorbent polymer. Since it is common, it is preferable to use it as a raw material as it is, or pulp fibers in which the superabsorbent polymer remains after appropriately collecting the superabsorbent polymer. This is preferable because the mixing treatment of the pulp fiber and the superabsorbent polymer is not necessary.
高吸収性ポリマーとは異なる熱可塑性樹脂は特に限定されず、オレフィン系樹脂、ポリエチレンテレフタレート（ＰＥＴ）等のポリエステル系樹脂、及びポリアミド系樹脂の少なくとも一種を用いることができる。特に、ポリエチレンやポリプロピレン等のオレフィン系樹脂が好適である。 The thermoplastic resin different from the superabsorbent polymer is not particularly limited, and at least one of an olefin resin, a polyester resin such as polyethylene terephthalate (PET), and a polyamide resin can be used. In particular, olefinic resins such as polyethylene and polypropylene are suitable.
パルプ繊維、高吸収性ポリマー、及び高吸収性ポリマーとは異なる熱可塑性樹脂の配合量は適宜定めれば良いが、パルプ含有樹脂成型品におけるパルプ繊維及び高吸収性ポリマーの合計含有量が１０〜６０重量％、特に２０〜５１重量％であるのが好ましい。また、パルプ含有樹脂成型品における高吸収性ポリマーとは異なる熱可塑性樹脂の含有量が４０〜９０重量％、特に４９〜８０重量％であるのが好ましい。また、パルプ繊維及び高吸収性ポリマーの合計含有量中のパルプ繊維含有量が６５〜９９．９重量％、特に８０〜９９．５重量％であるのが好ましい。また、パルプ繊維及び高吸収性ポリマーの合計含有量中の高吸収性ポリマー含有量が０．１〜３５重量％、特に０．５〜２０重量％であるのが好ましい。パルプ含有量が少なすぎると、リサイクル効率が悪くなり、多すぎると表面光沢及び耐久性が低下する。また、高吸収性ポリマー含有量が少なすぎると、表面光沢及び耐久性の改善効果が弱くなり、また一定量以上になると表面光沢及び耐久性の改善効果が飽和するだけでなく、高吸収性ポリマー単独で再利用した方が費用対効果に優れるようになる。わが国ではパルプ繊維の含有量を５０重量％超とすることにより紙として廃棄できる場合があるため、パルプ繊維の含有量を５０重量％超とするのも好ましい形態である。そのようなパルプ高配合とした場合、従来は表面光沢及び耐久性が低下するが、本発明では高吸収性ポリマーの配合により表目光沢及び耐久性の低下は抑制される。 The blending amount of the pulp fiber, the superabsorbent polymer, and the thermoplastic resin different from the superabsorbent polymer may be appropriately determined, but the total content of the pulp fiber and the superabsorbent polymer in the pulp-containing resin molded product is 10 to 10. It is preferably 60% by weight, in particular 20 to 51% by weight. Moreover, it is preferable that content of the thermoplastic resin different from the superabsorbent polymer in a pulp containing resin molded article is 40 to 90 weight%, especially 49 to 80 weight%. Further, the pulp fiber content in the total content of the pulp fiber and the superabsorbent polymer is preferably 65 to 99.9% by weight, particularly preferably 80 to 99.5% by weight. Moreover, it is preferable that superabsorbent polymer content in the total content of pulp fiber and superabsorbent polymer is 0.1 to 35% by weight, particularly 0.5 to 20% by weight. If the pulp content is too low, the recycling efficiency will be poor, and if it is too high, the surface gloss and durability will be reduced. In addition, if the content of the superabsorbent polymer is too small, the effect of improving the surface gloss and durability becomes weak, and if it exceeds a certain amount, not only the effect of improving the surface gloss and durability is saturated, but also the superabsorbent polymer. Reusing it alone is more cost effective. In Japan, the pulp fiber content may be discarded as paper by setting the pulp fiber content to more than 50% by weight. Therefore, the pulp fiber content is preferably set to more than 50% by weight. When such a high pulp content is used, the surface gloss and durability are conventionally reduced. However, in the present invention, the reduction in surface gloss and durability is suppressed by the addition of the superabsorbent polymer.
パルプ繊維、高吸収性ポリマー、及び高吸収性ポリマーとは異なる熱可塑性樹脂以外の成分として、本発明の範囲内で、不純物や、着色剤等の添加剤を含有することができる。 As components other than the pulp fiber, the superabsorbent polymer, and the thermoplastic resin different from the superabsorbent polymer, additives such as impurities and colorants can be contained within the scope of the present invention.
成型品の用途や形状、構造は特に限定されるものではなく、各種製品の筐体、その他の部品とすることができる。特に、収容物を取り出すために開閉する開閉蓋を有する容器のように、可動部がある場合には、耐久性が重要になるため、蓋及び容器本体の少なくとも一方に本発明の成型品を適用すると好ましい。このような容器の例としては、特開２０１３−２０９１２０号公報記載のようなスライド開閉タイプの容器や、特開２０１１−７３６８５号公報記載のように容器本体と蓋体とが一体とされ、両者の境界部分の撓み変形により蓋の開閉を行うタイプの容器や、特開２０１１−１８４１０６号公報記載のように容器本体と蓋体とが別体とされ、蓋体が揺動可能に容器本体に連結されたヒンジタイプの容器を挙げることができる。これらはいずれも湿潤タイプの拭き取り製品の容器であるが、これに限られるものではない。 The use, shape, and structure of the molded product are not particularly limited, and can be a casing of various products or other parts. In particular, in the case where there is a movable part, such as a container having an opening / closing lid that opens and closes to take out the contents, durability is important, so the molded product of the present invention is applied to at least one of the lid and the container body. It is preferable. Examples of such containers include a slide opening / closing type container as described in JP2013-209120A, and a container main body and a lid as described in JP2011-73685A. A container that opens and closes the lid by bending deformation of the boundary portion of the container, or a container body and a lid body are separate from each other as described in JP 2011-184106 A. Mention may be made of linked hinge-type containers. These are all wet type wiping product containers, but are not limited thereto.
また、パルプ含有樹脂成型品には、その用途に応じて、塗装等により公知の液体遮断層や気体遮断層等の機能を付加することもできる。 Moreover, functions, such as a well-known liquid interruption | blocking layer and a gas interruption | blocking layer, can also be added to a pulp containing resin molding by coating etc. according to the use.
パルプ含有樹脂成型品は上記原料を混合して成型することにより製造することができる。製造に際しては、上記原料を混合してペレットを製造し、このペレットを用いて成型する他、上記原料を混合してペレット化せずにそのまま成型することもできる。上記原料を廃材から回収する場合等、必要に応じて粉砕処理を行った後に混合することができる。特に、パルプ繊維を廃材から回収する場合には必要に応じて離解処理をすることができる。 The pulp-containing resin molded product can be produced by mixing and molding the above raw materials. At the time of production, the above raw materials are mixed to produce pellets and molded using the pellets, or the raw materials can be mixed and pelletized as they are without being pelletized. When recovering the above raw materials from waste materials, they can be mixed after being pulverized as necessary. In particular, when recovering pulp fibers from waste materials, disaggregation can be performed as necessary.
上記原料の混合装置としては、高速流動混合機、押出機等の公知の混合装置を特に限定無く用いることができる。 As the raw material mixing apparatus, a known mixing apparatus such as a high-speed fluid mixer and an extruder can be used without any particular limitation.
また、パルプ含有樹脂成型品の成型方法は、射出成型等、公知の成型手法を特に限定無く用いることができる。 Moreover, the molding method of a pulp containing resin molded product can use well-known molding methods, such as injection molding, without limitation.
＜評価試験＞
表１に示す各原料配合（表中のＳＡＰはポリアクリル酸ナトリウム塩高吸収性ポリマー、ＰＰはポリプロピレンの意味。）で、特開２０１１−１８４１０６号公報記載のものと同様のヒンジタイプの蓋体を射出成型し、光沢性を目視での二段階（〇…No.1と比較して光沢に違いが殆ど無い、×…No.1と比較して光沢が少ない）で評価するとともに、蓋体を容器に装着した状態で開閉を５００回行い、耐久性を四段階（◎…何の変化も観察できず、〇…ヒンジに白色化等の変質が発生した、△…ヒンジにヒビが発生した、×…ヒンジが折れた）で評価した。パルプ繊維及びＳＡＰは未使用の使い捨ておむつの吸収体から回収したものを用いた。
<Evaluation test>
Hinge-type lids similar to those described in Japanese Patent Application Laid-Open No. 2011-184106, with each raw material composition shown in Table 1 (SAP in the table is a polyacrylic acid sodium salt superabsorbent polymer, PP means polypropylene) In addition, the glossiness is evaluated in two stages visually (○… There is almost no difference in gloss compared to No.1, ×… Less gloss compared to No.1), and the lid Opening and closing 500 times with the container attached to the container, durability was evaluated in four stages (◎… no change was observed, ○… deterioration such as whitening occurred in the hinge, Δ… cracked in the hinge , X ... the hinge was broken). Pulp fibers and SAP were collected from an absorbent body of an unused disposable diaper.
評価結果を表１に併記した。この結果から、高吸収性ポリマーの含有により光沢性及び耐久性の向上が確認された。 The evaluation results are also shown in Table 1. From these results, it was confirmed that the gloss and durability were improved by the inclusion of the superabsorbent polymer.
本発明は、パルプ含有樹脂成型品及びその製造に適用できるものである。 The present invention is applicable to a pulp-containing resin molded product and its production.
Claims (8)
前記パルプ含有樹脂成型品における前記高吸収性ポリマーとは異なる熱可塑性樹脂の含有量が４０〜９０重量％であり、
前記パルプ繊維及び高吸収性ポリマーの合計含有量中のパルプ繊維含有量が６５〜９９．９重量％であり、
前記パルプ繊維及び高吸収性ポリマーの合計含有量中の高吸収性ポリマー含有量が０．１〜３５重量％である、
請求項１〜４のいずれか１項に記載のパルプ含有樹脂成型品。 The total content of the pulp fiber and superabsorbent polymer in the pulp-containing resin molded product is 10 to 60% by weight,
The content of the thermoplastic resin different from the superabsorbent polymer in the pulp-containing resin molded product is 40 to 90% by weight,
The pulp fiber content in the total content of the pulp fiber and the superabsorbent polymer is 65 to 99.9% by weight,
The superabsorbent polymer content in the total content of the pulp fiber and superabsorbent polymer is 0.1 to 35% by weight,
The pulp-containing resin molded product according to any one of claims 1 to 4.
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