JPH0920834A - Resin composition for foaming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition containing a large amount of ligneous powder, favorably keeping fluidity, suppressing heat generation and having high quality in melt molding of extrusion molding, injection molding, etc. SOLUTION: This resin composition contains (A) 100 pts.wt. vinyl chloride- based copolymer consisting essentially of (i) vinyl chloride powder and containing (ii) 2-20wt.% ethylene component and (B) 10-175 pts.wt. ligneous powder, and vinyl chloride powder previously mixed with (C) a stabilizer for vinyl chloride-based copolymer (e.g. calcium stearate) and/or (D) a thermal decomposition type foaming agent (e.g. azodicarboxylic amide) is used as the component B. Furthermore, e.g. wood of hemlock spruce, etc., having <=150μm average particle diameter and <=10% water content is preferably used as the component B.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、発泡用樹脂組成物
に関し、特に押出成形や射出成形等に適した発泡用樹脂
組成物に関する。TECHNICAL FIELD The present invention relates to a foaming resin composition, and more particularly to a foaming resin composition suitable for extrusion molding, injection molding and the like.

【０００２】[0002]

【従来の技術】近年、合成樹脂成形品に天然木材に近い
特性を付与することによって木材の代替材料を得るため
の種々の試みがなされている。その方法の一つとして、
合成樹脂に粉末状の木質材料を配合剤として添加する方
法がある。この方法によって合成樹脂に木質材料の特性
を効果的に付与し得ることが知られており、具体的に、
木材に近い触覚、風合いを付与するためポリ塩化ビニル
系樹脂が使用され、発泡体とし、木質材料を上記ポリ塩
化ビニル系樹脂１００重量部に対し２０〜３０重量部程
度配合したものが住宅用内装材の巾木等に使用されてい
る。2. Description of the Related Art In recent years, various attempts have been made to obtain a substitute material for wood by giving a synthetic resin molded article with properties close to those of natural wood. As one of the methods,
There is a method of adding powdery woody material to a synthetic resin as a compounding agent. It is known that by this method it is possible to effectively impart the properties of a wooden material to a synthetic resin, and specifically,
Polyvinyl chloride resin is used to give a touch and texture close to that of wood. It is used as a foam, and a wood material is blended in an amount of about 20 to 30 parts by weight with respect to 100 parts by weight of the above polyvinyl chloride resin. Used for wood skirting boards.

【０００３】しかしながら、更に、天然木材に近い特性
を付与する目的で、合成樹脂成形品中の木質材料の含有
量を多くすると、該合成樹脂組成物の成形性及び得られ
る製品の品質の両面で幾つかの問題が生ずる。その一つ
として、上記合成樹脂組成物の溶融時の流れの悪化が挙
げられる。即ち、木質粉末をポリ塩化ビニル系樹脂に多
量に添加すると、一般に上記合成樹脂組成物の溶融粘度
が高くなる上に、更に、木質粉末は凝集し易い性質があ
るために成形機、就中、狭隘な樹脂通路を有する金型中
流れが悪くなる。そのため、成形機における樹脂圧が上
昇し、吐出量乃至吐出速度が減少乃至低下し、該合成樹
脂組成物の発熱が大きくなって成形性を悪化せしめるだ
けでなく、品質面にも、酸化による変色や強度低下等の
悪影響を及ぼす。特に上記現象は、成形法の特性から射
出成形において顕著に現れる。However, if the content of the wood-based material in the synthetic resin molded product is increased for the purpose of imparting properties close to those of natural wood, both the moldability of the synthetic resin composition and the quality of the product obtained will be improved. Several problems arise. One of them is deterioration of the flow of the synthetic resin composition at the time of melting. That is, when a large amount of wood powder is added to a polyvinyl chloride-based resin, the melt viscosity of the synthetic resin composition is generally increased, and further, the wood powder has a property of easily aggregating, so a molding machine, among others, The flow in the mold having a narrow resin passage becomes poor. Therefore, the resin pressure in the molding machine increases, the discharge amount or discharge speed decreases or decreases, the heat generation of the synthetic resin composition increases, and the moldability deteriorates. And adversely affect the strength. In particular, the above-mentioned phenomenon remarkably appears in injection molding due to the characteristics of the molding method.

【０００４】上記の如き発泡性塩化ビニル系樹脂組成物
として、例えば、特公昭６３−９５４０号公報には、木
質材料を１〜２０重量部、好ましくは３〜１０重量部程
度の少量を含む配合系において、重合度５００〜８００
の比較的重合度の低いポリ塩化ビニル系樹脂を用いた発
泡性塩化ビニル系樹脂組成物が開示されている。しか
し、上記特公昭６３−９５４０号公報に開示された発泡
性塩化ビニル系樹脂組成物も、若干溶融時の流れはよく
なるが、上記木質材料の配合量を多くすると、溶融時の
流れが悪くなり、更に、重合度を低くした分だけ、破泡
等発泡特性が低下してしまうので、より天然木材に近い
特性を付与するため、木質材料の配合量を多くするする
ことはできない。As the foamable vinyl chloride resin composition as described above, for example, Japanese Patent Publication No. 63-9540 has a composition containing a wood material in a small amount such as 1 to 20 parts by weight, preferably 3 to 10 parts by weight. In the system, the degree of polymerization is 500 to 800
A foamable vinyl chloride resin composition using a polyvinyl chloride resin having a relatively low degree of polymerization is disclosed. However, the expandable vinyl chloride resin composition disclosed in Japanese Patent Publication No. 63-9540 also has a slightly improved flow at the time of melting, but when the amount of the wood material is increased, the flow at the time of melting becomes poor. Further, since the foaming property such as foam breaking is deteriorated by the degree of lowering the degree of polymerization, it is not possible to increase the blending amount of the wood material in order to impart the property closer to that of natural wood.

【０００５】成形法はホットプレス法と異なるが、例え
ば、特開昭６１−２５０５号公報には、セルロース系素
材の破砕物を多量に含む木質板の成形方法が開示されて
いる。しかし、上記特開昭６１−２５０５号公報に開示
された木質板の成形方法には、セルロース系素材の破砕
物に対し、ポリ塩化ビニル系樹脂を１０〜３０重量％を
バインダーとして使用するものであって、発泡をさせた
り、これらの素材を押出成形や射出成形用の発泡用樹脂
組成物として用いることはできない。Although the molding method is different from the hot pressing method, for example, Japanese Patent Application Laid-Open No. 61-2505 discloses a method for molding a wood board containing a large amount of crushed material of a cellulosic material. However, in the method for molding a wooden board disclosed in JP-A-61-2505, 10 to 30% by weight of a polyvinyl chloride resin is used as a binder with respect to a crushed material of a cellulosic material. Therefore, it is not possible to foam and use these materials as a foaming resin composition for extrusion molding or injection molding.

【０００６】[0006]

【発明が解決しようとする課題】本発明は、叙上の事実
に鑑みなされたものであって、その目的とするところ
は、木質粉末を多量に含む発泡用樹脂組成物であって、
押出成形や射出成形等の溶融成形時に、流動性を良好に
維持し、該樹脂組成物の発熱を抑制することによって、
高い生産性と品質を与える発泡用樹脂組成物を提供する
にある。SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and its object is to provide a foaming resin composition containing a large amount of wood powder,
During melt molding such as extrusion molding and injection molding, by maintaining good fluidity and suppressing heat generation of the resin composition,
A foaming resin composition that provides high productivity and quality is provided.

【０００７】[0007]

【課題を解決するための手段】本発明は、塩化ビニル成
分を主体とし、エチレン成分を２〜２０重量％含む塩化
ビニル系共重合体１００重量部と木質粉末１０〜１７５
重量部を含み、該木質粉末が、上記塩化ビニル系共重合
体用安定剤及び／又は熱分解型発泡剤と予め予備混合さ
れたものであること特徴とする発泡用樹脂組成物をその
要旨とするものである。According to the present invention, 100 parts by weight of a vinyl chloride-based copolymer mainly containing a vinyl chloride component and containing 2 to 20% by weight of an ethylene component and 10 to 175 of wood powder.
A foaming resin composition, characterized in that the wood powder is pre-mixed with the stabilizer for vinyl chloride-based copolymer and / or the heat-decomposable foaming agent in advance, including its parts by weight. To do.

【０００８】上記塩化ビニル系共重合体は、塩化ビニル
成分を主体とし、エチレン成分を２〜２０重量％含むも
のである。上記塩化ビニル成分及びエチレン成分以外の
成分としては、上記両者と共重合し得る化合物であれば
特に限定されるものではないが、例えば、プロピレン、
ブチレン等のα−オレフィン類、酢酸ビニル、プロピオ
ン酸ビニル等のビニルエステル類、ブチルビニルエーテ
ル、セチルビニルエーテル等のビニルエーテル類、メチ
ル（メタ）アクリレート、ブチル（メタ）アクリレー
ト、ヒドロキシエチル（メタ）アクリレート等の（メ
タ）アクリル酸エステル類、スチレン、α−メチルスチ
レン等の芳香族ビニル類、フッ化ビニル、フッ化ビニリ
デン、塩化ビニリデン等のハロゲン化ビニル類、Ｎ−フ
ェニルマレイミド、Ｎ−シクロヘキシルマレイミド等の
Ｎ−置換マレイミド等が挙げられる。The vinyl chloride-based copolymer contains a vinyl chloride component as a main component and an ethylene component in an amount of 2 to 20% by weight. The component other than the vinyl chloride component and the ethylene component is not particularly limited as long as it is a compound that can be copolymerized with both, for example, propylene,
Α-olefins such as butylene, vinyl acetates such as vinyl acetate and vinyl propionate, vinyl ethers such as butyl vinyl ether and cetyl vinyl ether, methyl (meth) acrylate, butyl (meth) acrylate, hydroxyethyl (meth) acrylate and the like. (Meth) acrylic esters, styrene, aromatic vinyls such as α-methylstyrene, vinyl halides such as vinyl fluoride, vinylidene fluoride and vinylidene chloride, N such as N-phenylmaleimide and N-cyclohexylmaleimide -Substituted maleimide and the like can be mentioned.

【０００９】上記エチレン成分の含有量が２重量％未満
であると、上記発泡用樹脂組成物の溶融粘度が上昇し、
流動特性を悪化させ、上記含有量が２０重量％を超える
と、得られる成形品の機械的強度が低下し、いずれも好
ましいものではない。When the content of the ethylene component is less than 2% by weight, the melt viscosity of the foaming resin composition increases,
If the flow characteristics are deteriorated and the above content exceeds 20% by weight, the mechanical strength of the obtained molded article decreases, which is not preferable.

【００１０】上記共重合各成分から塩化ビニル系共重合
体を得る方法は、特に限定されるものではなく、公知の
方法が使用できる。上記塩化ビニル系共重合体の重合度
は、４００〜２０００が好ましい。上記重合度が４００
未満であると、得られる成形品の機械的強度が低下し、
上記重合度が２０００を超えると、上記発泡用樹脂組成
物の溶融粘度が大きくなり、成形時の流動特性が悪化
し、いずれも好ましくない。The method for obtaining a vinyl chloride-based copolymer from each of the above copolymerization components is not particularly limited, and a known method can be used. The polymerization degree of the vinyl chloride-based copolymer is preferably 400 to 2000. The degree of polymerization is 400
When it is less than, the mechanical strength of the obtained molded article is reduced,
If the degree of polymerization exceeds 2000, the melt viscosity of the resin composition for foaming becomes large and the flow characteristics at the time of molding deteriorate, which is not preferable.

【００１１】上記木質粉末は、木質化した天然物もしく
はその加工品を成形可能なサイズに粉砕したものであっ
て、その素材は特に限定されるものではないが、例え
ば、栂、檜、松、ラワン等の木材、籾殻、パルプ等のセ
ルロース繊維加工品等が挙げられる。上記木質粉末のサ
イズは、好ましくは平均粒径で２００μｍ以下、更に好
ましくは１５０μｍ以下、最大粒径で６００μｍ以下が
好ましい。上記平均粒径が２００μｍを超え、もしくは
上記最大粒径が６００μｍを超えると、上記発泡用樹脂
組成物の成形時、成形機内に上記木質粉末が滞留し、所
謂”詰まり”を起こし、これが原因で得られる成形品に
過熱による変色、所謂”やけ”を起こしたりするトラブ
ルのおそれがある。The above-mentioned wood powder is obtained by crushing a woody natural product or a processed product thereof into a size capable of being molded, and the material thereof is not particularly limited, and examples thereof include tsuga, cypress, pine, Examples include wood such as rawan and processed products of cellulose fiber such as rice husk and pulp. The wood powder preferably has an average particle size of 200 μm or less, more preferably 150 μm or less, and a maximum particle size of 600 μm or less. If the average particle diameter exceeds 200 μm or the maximum particle diameter exceeds 600 μm, the wood powder stays in the molding machine during molding of the foaming resin composition, causing so-called “clogging”, which is a cause. There is a risk of discoloration due to overheating or so-called "burn" in the obtained molded product.

【００１２】又、上記木質粉末の含水率は、１０重量％
以下の可及的少ない量に止めることが望ましい。上記木
質粉末の含水率が１０重量％を超えて高いと、得られる
成形品表面での発泡により外観品質を低下させ、著しい
場合にはこれが原因で樹脂自体を酸化劣化し、機械的強
度を低下させる。上記木質粉末の含水率を１０重量％以
下の可及的少ない量に止めるには、使用時に上記木質粉
末を乾燥する方法が採られてもよいが、上記乾燥後、耐
水性被膜を形成し得る疎水性処理剤を含浸、塗布等の適
宜手段によって表面処理を施しておくと便利である。The water content of the wood powder is 10% by weight.
It is desirable to keep the amount as small as possible below. When the water content of the wood powder is higher than 10% by weight, the appearance quality is deteriorated due to foaming on the surface of the obtained molded product, and in a remarkable case, the resin itself is oxidatively deteriorated due to this and mechanical strength is deteriorated. Let A method of drying the wood powder at the time of use may be adopted in order to keep the water content of the wood powder to a minimum amount of 10% by weight or less, but a water resistant coating may be formed after the drying. It is convenient to perform surface treatment by an appropriate means such as impregnation or coating with a hydrophobic treatment agent.

【００１３】上記木質粉末の配合量は、上記塩化ビニル
系共重合体１００重量部に対して１０〜１７５重量部で
ある。上記配合量が１０重量部未満であると本発明で意
図する天然木材に近い触感、風合いの優れた成形品が得
られず、上記配合量が１７５重量部を超えると、上記発
泡用樹脂組成物の成形時、流動特性が悪化し成形性を悪
化させる。The amount of the above wood powder is 10 to 175 parts by weight based on 100 parts by weight of the above vinyl chloride copolymer. If the blending amount is less than 10 parts by weight, a molded product having a touch and texture close to that of natural wood intended by the present invention cannot be obtained, and if the blending amount exceeds 175 parts by weight, the above foaming resin composition is used. At the time of molding, the flow characteristics deteriorate and the moldability deteriorates.

【００１４】上記木質粉末は、上記塩化ビニル系共重合
体に添加されるに際して、予め、上記塩化ビニル系共重
合体用安定剤及び／又は熱分解型発泡剤と予備混合され
る。予備混合される上記塩化ビニル系共重合体用安定剤
及び／又は熱分解型発泡剤は、上記塩化ビニル系共重合
体に配合される全ての安定剤及び／又は熱分解型発泡剤
であってもよいが、その一部の安定剤及び／又は熱分解
型発泡剤であって、残部は上記塩化ビニル系共重合体に
予備混合しておいてもよく、予備混合された上記木質粉
末と共に上記塩化ビニル系共重合体に配合されてもよ
い。When the wood powder is added to the vinyl chloride copolymer, it is preliminarily mixed with the stabilizer for vinyl chloride copolymer and / or the thermal decomposition type foaming agent. The premixed stabilizer for vinyl chloride-based copolymer and / or thermal decomposition type foaming agent is all the stabilizers and / or thermal decomposition type foaming agent blended in the vinyl chloride copolymer. However, a part of the stabilizer and / or the thermal decomposition type foaming agent may be pre-mixed with the vinyl chloride-based copolymer, and the rest may be pre-mixed with the wood powder. You may mix | blend with a vinyl chloride type copolymer.

【００１５】上記塩化ビニル系共重合体用安定剤は、特
に限定されるものではないが、例えば、鉛白、塩基性亜
硫酸鉛、二塩基性亜硫酸鉛、三塩基性硫酸鉛、二塩基性
亜リン酸鉛、シリカゲル共沈珪酸鉛、ステアリン酸鉛、
安息香酸鉛、二塩基性ステアリン酸鉛、ナフテン酸鉛等
の鉛系化合物、ステアリン酸カルシウム・ステアリン酸
バリウム・ステアリン酸亜鉛等の複合系、又、ジブチル
錫マレエート、ジオクチル錫ラウレート等の有機錫化合
物等が挙げられる。ただし、メルカプト基を含む安定剤
と鉛系化合物を併用すると、反応して硫化物を生成し、
得られる成形体を汚染するので注意を要する。本発明に
おいて上記塩化ビニル系共重合体用安定剤の配合量は、
上記塩化ビニル系共重合体１００重量部に対し１〜１０
重量部程度が好ましい。上記木質粉末の配合量にもよる
が、上記配合量が、１重量部未満では溶融成形時の熱履
歴によって得られる成形品に変色をあたえ、上記配合量
が、１０重量部を超える熱安定化効果は飽和するばかり
か、却って成形性に悪影響を及ぼす。The stabilizer for the vinyl chloride-based copolymer is not particularly limited, but examples thereof include lead white, basic lead sulfite, dibasic lead sulfite, tribasic lead sulfate and dibasic sulfite. Lead phosphate, silica gel co-precipitated lead silicate, lead stearate,
Lead compounds such as lead benzoate, dibasic lead stearate and lead naphthenate, complex compounds such as calcium stearate, barium stearate and zinc stearate, and organic tin compounds such as dibutyltin maleate and dioctyltin laurate. Is mentioned. However, when a stabilizer containing a mercapto group is used in combination with a lead-based compound, it reacts to form a sulfide,
Care must be taken as it contaminates the obtained molded body. In the present invention, the blending amount of the stabilizer for vinyl chloride-based copolymer is
1-10 with respect to 100 parts by weight of the vinyl chloride-based copolymer
It is preferably about parts by weight. Depending on the blending amount of the above wood powder, if the blending amount is less than 1 part by weight, a molded product obtained by heat history during melt molding gives discoloration, and the blending amount exceeds 10 parts by weight for thermal stabilization. Not only is the effect saturated, but the moldability is adversely affected.

【００１６】上記熱分解型発泡剤は、特に限定されるも
のではないが、例えば、重炭酸ナトリウム、炭酸アンモ
ニウム、亜硝酸アンモニウム、ホウ水素化ナトリウム等
の無機系発泡剤、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、ｐ，ｐ’−オキシビス（ベン
ゼンスルホニルヒドラジッド）等の有機系発泡剤が挙げ
られる。上記発泡剤の配合量は、上記塩化ビニル系共重
合体１００重量部に対し０．１〜５重量部程度が好まし
い。上記発泡剤の配合量が０．１重量部未満であると、
必要倍率の発泡体が得られず、上記配合量が５重量部を
超える場合には、得られる成形品の発泡組織が気泡の崩
れに等により均一性を損ない品質欠陥を生ずるおそれが
ある。The thermal decomposition type foaming agent is not particularly limited, but examples thereof include inorganic foaming agents such as sodium bicarbonate, ammonium carbonate, ammonium nitrite, sodium borohydride, azodicarbonamide, dinitrosopenta. Examples include organic foaming agents such as methylenetetramine and p, p′-oxybis (benzenesulfonylhydrazide). The blending amount of the foaming agent is preferably about 0.1 to 5 parts by weight with respect to 100 parts by weight of the vinyl chloride copolymer. When the blending amount of the foaming agent is less than 0.1 parts by weight,
When a foam having a required ratio cannot be obtained and the amount of the above-mentioned compounding amount exceeds 5 parts by weight, the foamed structure of the obtained molded product may deteriorate the uniformity due to collapse of bubbles or the like, resulting in a quality defect.

【００１７】本発明の上記発泡用樹脂組成物には、上記
各配合物の他、必要に応じて、加工助剤、滑剤、充填
剤、着色剤、可塑剤、安定化助剤、造核剤、発泡助剤、
離型剤その他の添加剤が配合されてもよい。In the foaming resin composition of the present invention, in addition to the above-mentioned respective components, if necessary, processing aids, lubricants, fillers, colorants, plasticizers, stabilizing aids, nucleating agents , Foaming aid,
A release agent and other additives may be blended.

【００１８】上記加工助剤としては、例えば、メチルア
クリレート、エチルアクリレート、ブチルアクリレー
ト、メチルメタクリレート、エチルメタクリレート、ブ
チルメタクリレートの単独重合体或いはこれらの２種以
上からなる共重合体、これらの（メタ）アクリル系モノ
マーを主体にし、これと共重合し得るスチレン、α−メ
チルスチレン、アクリロニトリル等のビニルモノマーと
共重合した（メタ）アクリル系共重合体が挙げられる。
上記重合体もしくは共重合体の分子量は、重量平均分子
量で２５０万〜６００万程度のものが好適に使用され
る。Examples of the processing aids include homopolymers of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate, copolymers of two or more of these, and (meth) thereof. Examples thereof include (meth) acrylic copolymers mainly composed of an acrylic monomer and copolymerized with a vinyl monomer such as styrene, α-methylstyrene, and acrylonitrile.
The polymer or copolymer preferably has a weight average molecular weight of about 2,500,000 to 6,000,000.

【００１９】上記滑剤としては、例えば、ステアリン酸
等の脂肪酸類、脂肪酸エステル類、オレフィンワックス
類等が挙げられる。又、上記充填剤としては、例えば、
炭酸カルシウム、タルク等が挙げられる。又、上記可塑
剤としては、例えば、ジオクチルテレフタレート等の芳
香族エステル類が好適に使用される。Examples of the lubricant include fatty acids such as stearic acid, fatty acid esters, olefin waxes and the like. Further, as the filler, for example,
Examples include calcium carbonate and talc. As the plasticizer, aromatic esters such as dioctyl terephthalate are preferably used.

【００２０】上記塩化ビニル系共重合体用安定剤及び熱
分解型発泡剤以外の添加剤の添加方法は、特に限定され
るものではなく、上記安定剤及び／又は熱分解型発泡剤
と共に上記木質粉末と予備混合された後、上記塩化ビニ
ル系共重合体に配合されてもよく、上記塩化ビニル系共
重合体に予め予備混合された後、上記木質粉末と混合さ
れてもよく、その他の配合手順で配合されてもよい。上
記発泡用樹脂組成物は、上記の如き手順で混合された粉
体状で溶融成形機に供給されてもよいが、ペレタイザー
を用いてペレット状に加工した発泡用樹脂組成物として
供給されてもよい。The method of adding the additives other than the stabilizer for vinyl chloride-based copolymer and the thermal decomposition type foaming agent is not particularly limited, and the above wood material is used together with the stabilizer and / or the thermal decomposition type foaming agent. After being premixed with a powder, it may be blended with the vinyl chloride-based copolymer, or may be premixed with the vinyl chloride-based copolymer in advance and then blended with the woody powder, and other blends. It may be compounded in a procedure. The foaming resin composition may be supplied to the melt molding machine in the form of powder mixed by the procedure as described above, or may be supplied as a foaming resin composition processed into pellets using a pelletizer. Good.

【００２１】上記各配合物の混合装置は、特に限定され
るものではないが、例えば、混合槽の中で、平板型、プ
ロペラ型、ファウドラー型等の攪拌羽根を回転させる構
造の一般的ミキサー、擂潰機、シェイカー、ボールミル
等を用いてもよいが、混合槽の中に高速回転可能な攪拌
羽根を備えたヘンシェルミキサーは、作業効率等からよ
り好ましいものである。The mixing apparatus for each of the above-mentioned compounds is not particularly limited, but for example, a general mixer having a structure in which stirring blades of flat plate type, propeller type, Faudler type, etc. are rotated in a mixing tank, A crusher, a shaker, a ball mill or the like may be used, but a Henschel mixer having a stirring blade capable of rotating at high speed in a mixing tank is more preferable from the viewpoint of work efficiency and the like.

【００２２】（作用）本発明の発泡用樹脂組成物は、塩
化ビニル成分を主体とし、エチレン成分を２〜２０重量
％含む塩化ビニル系共重合体１００重量部と木質粉末１
０〜１７５重量部を含み、該木質粉末が、上記塩化ビニ
ル系共重合体用安定剤及び／又は熱分解型発泡剤と予め
予備混合されたものであるので木質粉末を多量に含む発
泡用樹脂組成物であるにも拘らず、押出成形や射出成形
等の溶融成形時に、流動性を良好に維持し、該樹脂組成
物の発熱を抑制することによって、高い生産性と品質を
与える。(Function) The foaming resin composition of the present invention comprises 100 parts by weight of a vinyl chloride-based copolymer mainly containing a vinyl chloride component and 2 to 20% by weight of an ethylene component and a wood powder 1.
A foaming resin containing 0 to 175 parts by weight and containing a large amount of wood powder because the wood powder is pre-mixed with the stabilizer for vinyl chloride copolymer and / or the thermal decomposition type foaming agent in advance. Despite being a composition, it maintains high fluidity and suppresses heat generation of the resin composition during melt molding such as extrusion molding and injection molding, thereby providing high productivity and quality.

【００２３】[0023]

【発明の実施の形態】以下、本発明の実施の形態を実施
例を挙げて更に詳細に説明する。 ［木質粉末の予備混合］１．木質粉末： 建築用の木材を乾燥、粉砕し、含水率
５．０％、平均粒径６０μｍ（最大粒径３００μｍ）の
木質粉末を調製した。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in more detail below with reference to examples. [Premixing of wood powder] 1. Wood powder: Wood for construction was dried and pulverized to prepare wood powder having a water content of 5.0% and an average particle size of 60 μm (maximum particle size of 300 μm).

【００２４】２．予備混合添加剤： 安定剤−１：三塩基性硫酸鉛（堺化学社製、商品名：
ＴＬ７０００） 安定剤−２：ステアリン酸カルシウム（堺化学社製、
商品名：ＳＣ１００）[0024] 2. Premixed additive: Stabilizer-1: Tribasic lead sulfate (manufactured by Sakai Chemical Co., Ltd., trade name:
TL7000) Stabilizer-2: calcium stearate (manufactured by Sakai Chemical Co., Ltd.,
(Product name: SC100)

【００２５】発泡剤−１：アゾジカルボンアミド（永
和化成社製、商品名：ビニホールＡＣ＃１） 発泡剤−２：重炭酸ナトリウム系発泡剤（永和化成社
製、商品名：ＳＣ−Ｄ）Foaming agent-1: Azodicarbonamide (manufactured by Eiwa Chemical Co., Ltd., trade name: VINIHOL AC # 1) Foaming agent-2: Sodium bicarbonate type foaming agent (manufactured by Eiwa Chemical Co., Ltd., trade name: SC-D)

【００２６】３．予備混合条件： （１）混合機：川田工業社製、スーパーミキサー（商品
名）、容量１００リッター （２）混合温度：４０〜８０℃ （３）混合時間：１５分[0026] 3. Premixing conditions: (1) Mixer: Kawada Kogyo Co., Ltd., Supermixer (trade name), capacity 100 liters (2) Mixing temperature: 40-80 ° C (3) Mixing time: 15 minutes

【００２７】上記木質粉末、安定剤及び発泡剤を表１に
示す配合で、上記混合機、混合温度及び混合時間によっ
て予備混合木質粉末を調製した。The above wood powder, stabilizer and foaming agent were blended as shown in Table 1 to prepare a premixed wood powder by the above mixer, mixing temperature and mixing time.

【００２８】[0028]

【表１】 [Table 1]

【００２９】〔発泡用樹脂組成物の作製〕１．塩化ビニル系樹脂： 塩化ビニル−エチレン共重合体（エチレン成分含有量
４．０重量％、重合度８００） 塩化ビニル−エチレン共重合体（エチレン成分含有量
６．７重量％、重合度７００） 塩化ビニル単独重合体（重合度８００）[Preparation of Foaming Resin Composition] 1. Vinyl chloride resin: Vinyl chloride-ethylene copolymer (ethylene content 4.0% by weight, degree of polymerization 800) Vinyl chloride-ethylene copolymer (ethylene content 6.7%, degree of polymerization 700) Chloride Vinyl homopolymer (degree of polymerization 800)

【００３０】２．追加添加剤： 安定剤−３：ステアリン酸鉛（堺化学社製、商品名：
ＳＬ１０００） 安定剤−４：ステアリン酸カルシウム（堺化学社製、
商品名：ＳＣ１００） 加工助剤：アクリル系共重合体（三菱レーヨン社製、
商品名：メタブレンＰ５３０Ａ９ 発泡剤：アゾジカルボンアミド（永和化成社製、商品
名：ビニホールＡＣ＃１）（予備混合添加剤に同じ） 2. Additional additive: Stabilizer-3: Lead stearate (Sakai Chemical Co., trade name:
SL1000) Stabilizer-4: calcium stearate (manufactured by Sakai Chemical Co., Ltd.,
Product name: SC100) Processing aid: Acrylic copolymer (Mitsubishi Rayon Co.,
Product name: Methabrene P530A9 Foaming agent: Azodicarbonamide (manufactured by Eiwa Chemical Co., Ltd., product name: Vinylhol AC # 1) (same as premixed additive)

【００３１】３．ペレタイザー： （１）ペレタイザー：長田製作所社製、ＳＬＭ５０（商
品名、５０ｍｍφ二軸異方向斜軸押出機、ホットカット
方式） （２）加工温度：バレル部１００〜１３０℃、金型部１
４０℃ （３）スクリュー回転数：２０ｒｐｍ[0031] 3. Pelletizer: (1) Pelletizer: Nagata Mfg. Co., SLM50 (trade name, 50 mmφ biaxial different-direction oblique-axis extruder, hot-cut method) (2) Processing temperature: barrel part 100 to 130 ° C, mold part 1
40 ° C (3) Screw rotation speed: 20 rpm

【００３２】（実施例１）上記塩化ビニル−エチレン共
重合体（エチレン成分含有量４．０重量％、重合度８０
０）からなる塩化ビニル系樹脂１００重量部に対し、
表２に示す如く、前記予備混合木質粉末３０重量部、
上記追加添加剤として加工助剤８重量部、安定剤４重
量部、安定剤２重量部を先に予備混合で使用した混合
機を用いて混合時間を３０分に変更したこと以外、予備
混合と同様に混合し、更に、上記ペレタイザーを用いて
ペレッティングして発泡用樹脂組成物を作製した。Example 1 The above vinyl chloride-ethylene copolymer (content of ethylene component: 4.0% by weight, degree of polymerization: 80)
0) to 100 parts by weight of vinyl chloride resin,
As shown in Table 2, 30 parts by weight of the premixed wood powder,
Premixing except that the mixing time was changed to 30 minutes using the mixer previously used for premixing 8 parts by weight of processing aid, 4 parts by weight of stabilizer, and 2 parts by weight of stabilizer as the additional additives. The mixture was mixed in the same manner and further pelletized using the above pelletizer to prepare a foaming resin composition.

【００３３】（実施例２〜９）、（比較例１〜４） 表１及び表２に示す配合で、実施例１と同様にして発泡
用樹脂組成物を作製した。(Examples 2 to 9), (Comparative Examples 1 to 4) With the formulations shown in Tables 1 and 2, a foaming resin composition was prepared in the same manner as in Example 1.

【００３４】[0034]

【表２】 [Table 2]

【００３５】上記実施例及び比較例で得られた発泡用樹
脂組成物の性能を評価するために、以下に示す方法で射
出成形試験及び押出成形試験を行った。試験結果は表３
及び表４に示す。In order to evaluate the performance of the foaming resin compositions obtained in the above Examples and Comparative Examples, an injection molding test and an extrusion molding test were conducted by the following methods. Table 3 shows the test results.
And Table 4 below.

【００３６】１．射出成形試験： 〔１〕射出成形条件 （１）射出成形機：日本製鋼所社製、Ｊ１００Ｅ−Ｃ５
（商品名、型締力１００トン） （２）金型：円筒成形用（キャビティー外径４０ｍｍ、
内径３２ｍｍ、長さ８０ｍｍ、ゲート位置：側面中央、
ゲート径４ｍｍ） （３）成形温度：シリンダー部１５０〜１８０℃、金型
部３０℃ （４）射出速度：８０％ （５）射出圧力：７０％ 1. Injection molding test: [1] Injection molding conditions (1) Injection molding machine: J100E-C5 manufactured by Japan Steel Works, Ltd.
(Product name, mold clamping force 100 tons) (2) Mold: For cylindrical molding (cavity outer diameter 40 mm,
Inner diameter 32 mm, length 80 mm, gate position: side surface center,
Gate diameter 4mm) (3) Molding temperature: Cylinder part 150-180 ° C, mold part 30 ° C (4) Injection speed: 80% (5) Injection pressure: 70%

【００３７】２．押出成形試験： 〔１〕押出成形条件 （１）押出成形機：プラスチック工学研究所社製、ＧＴ
−３２Ａ（商品名、３０ｍｍ単軸押出機） （２）スクリュー回転数：２０ｒｐｍ （３）金型：Ｔダイ（リップ幅３３ｍｍ、リップ厚さ５
ｍｍ） （４）成形温度：シリンダー部１００〜１８０℃、金型
部１７０℃ （５）サイジングダイ：リップ幅４０ｍｍ、リップ厚さ
８ｍｍ （６）冷却槽：長さ１ｍ、水槽容量３０リッター、水温
１９〜２１℃ （７）引取機：引取速度０．６ｍ／ｍｉｎ 2. Extrusion Molding Test: [1] Extrusion Molding Conditions (1) Extruder: GT, manufactured by Plastic Engineering Laboratory Co., Ltd.
-32A (Product name, 30 mm single screw extruder) (2) Screw rotation speed: 20 rpm (3) Mold: T die (lip width 33 mm, lip thickness 5)
mm) (4) Molding temperature: Cylinder part 100 to 180 ° C., mold part 170 ° C. (5) Sizing die: Lip width 40 mm, lip thickness 8 mm (6) Cooling tank: length 1 m, water tank capacity 30 liters, water temperature 19 ~ 21 ℃ (7) Pulling machine: Pulling speed 0.6m / min

【００３８】３．評価項目及び評価基準 （１）発泡性：得られた成形品の密度を測定し、該成形
品の密度によって発泡性を評価した。 （２）流動性：射出成形において発泡用樹脂組成物の流
れが悪いと、金型に上記発泡用樹脂組成物が完全に充填
されず、ゲートの逆側に未充填部分ができる。該ゲート
の逆側の未充填部分の有無によって上記発泡用樹脂組成
物の流動性を評価した。 （３）押出成形性：押出成形機のバレルヘッドにおける
発泡用樹脂組成物の圧力によって評価した。樹脂圧が２
００ｋｇｆ／ｃｍ² を超える場合、特に押出成形性が悪
いと評価できる。 （４）表面品質：得られた成形品の表面品質を、着
色：白木調に設定された着色が、酸化等によりどの程度
に変色したか、その着色の度合いによって、○：白木
調、△：薄茶色、×：茶色〜黒色、の３段階で評価。
滑らかさ：成形品の表面を手触りによって、天然木材に
どの程度似通っているか、○：さらさらしていて木質感
を感じさせる、△：つるつるしていてプラスチックらし
い感触、×：ざらざらしていて不快な感触、の３段階で
評価。艶：成形品の表面光沢によって、○：艶やかな
光沢がある、△：微かに光沢を感ずる、×：光沢を感じ
ない、の３段階で評価した。[0038] 3. Evaluation Items and Evaluation Criteria (1) Foamability: The density of the obtained molded product was measured, and the foamability was evaluated by the density of the molded product. (2) Fluidity: When the flow of the foaming resin composition is poor in injection molding, the mold is not completely filled with the foaming resin composition, and an unfilled portion is formed on the opposite side of the gate. The fluidity of the foaming resin composition was evaluated by the presence or absence of an unfilled portion on the opposite side of the gate. (3) Extrudability: Evaluated by the pressure of the foaming resin composition in the barrel head of the extruder. Resin pressure is 2
If it exceeds 00 kgf / cm ² , it can be evaluated that the extrusion moldability is particularly poor. (4) Surface quality: The surface quality of the obtained molded product is determined by the degree to which the coloring set in coloring: Shiraki has changed due to oxidation or the like, and the degree of coloring indicates ◯: Shiraki, Δ: Light brown, x: evaluated in three grades of brown to black.
Smoothness: How closely the surface of the molded product resembles natural wood by touch, ○: Smooth and feels like wood texture, △: Smooth and plastic feel, ×: Rough and uncomfortable Feeling is evaluated in 3 stages. Gloss: Depending on the surface gloss of the molded article, ◯: There is a glossy gloss, Δ: A little gloss is felt, and X: No gloss is felt.

【００３９】[0039]

【表３】 [Table 3]

【００４０】[0040]

【表４】 [Table 4]

【００４１】[0041]

【発明の効果】本発明の発泡用樹脂組成物は、叙上の如
く構成されているので、木質粉末を多量に含む発泡用樹
脂組成物であるにも拘らず、押出成形や射出成形等の溶
融成形時に、流動性を良好に維持し、該樹脂組成物の発
熱を抑制することによって、高い生産性と品質を与え
る。EFFECTS OF THE INVENTION Since the foaming resin composition of the present invention is constructed as described above, it can be used for extrusion molding, injection molding, etc., even though it is a foaming resin composition containing a large amount of wood powder. At the time of melt molding, good fluidity is maintained and heat generation of the resin composition is suppressed, whereby high productivity and quality are provided.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 塩化ビニル成分を主体とし、エチレン成
分を２〜２０重量％含む塩化ビニル系共重合体１００重
量部と木質粉末１０〜１７５重量部を含み、該木質粉末
が、上記塩化ビニル系共重合体用安定剤及び／又は熱分
解型発泡剤と予め予備混合されたものであること特徴と
する発泡用樹脂組成物。1. A vinyl chloride-based copolymer containing 100 parts by weight of a vinyl chloride-based copolymer containing 2 to 20% by weight of an ethylene component and 10 to 175 parts by weight of a wood powder. A resin composition for foaming, which is premixed with a stabilizer for a copolymer and / or a thermal decomposition type foaming agent.