JPH1160868A - Vinyl chloride resin composition for foam extrusion - Google Patents
Vinyl chloride resin composition for foam extrusionInfo
- Publication number
- JPH1160868A JPH1160868A JP9237661A JP23766197A JPH1160868A JP H1160868 A JPH1160868 A JP H1160868A JP 9237661 A JP9237661 A JP 9237661A JP 23766197 A JP23766197 A JP 23766197A JP H1160868 A JPH1160868 A JP H1160868A
- Authority
- JP
- Japan
- Prior art keywords
- vinyl chloride
- chloride resin
- weight
- resin composition
- expansion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、従来の化学発泡剤
の使用では不可能であった、微小な発泡セルが均一に分
散存在する、軽量化された発泡押出し成形用軟質塩化ビ
ニル系樹脂組成物、これを用いた成形品、及びこれを用
いた押出し成形品に関する。The present invention relates to a lightweight, soft vinyl chloride resin composition for foam extrusion molding, in which fine foam cells are uniformly dispersed and present, which was impossible with the use of a conventional chemical foaming agent. The present invention relates to a product, a molded product using the same, and an extruded product using the same.
【０００２】[0002]
【従来の技術】塩化ビニル樹脂（以下ＰＶＣと略す事が
ある）は、優れた物理的化学的性質をもち、かつ、他樹
脂に比べて安価な事から成形品の広い分野で利用されて
いる。しかしＰＶＣは比重(d )が１．４と大きく、こ
れに可塑剤(d＝０．９〜１．２)を加えて作られた軟質
ＰＶＣの比重も１．２〜１．４程度が一般的である。こ
れは他の樹脂に対し、例えばポリプロピレン（ｄ＝０．
９）の３０〜６０％増、発泡ポリウレタン（ｄ＝０．５
〜０．７）の２００〜２５０％増となり、重いという欠
点があり、軽量化の試みが種々なされている。2. Description of the Related Art Vinyl chloride resin (hereinafter sometimes abbreviated as PVC) has been used in a wide range of molded articles because it has excellent physical and chemical properties and is inexpensive compared to other resins. . However, the specific gravity (d) of PVC is as large as 1.4, and the specific gravity of soft PVC made by adding a plasticizer (d = 0.9 to 1.2) to this is generally about 1.2 to 1.4. It is a target. This means that, for example, polypropylene (d = 0.
9) 30 to 60% increase, foamed polyurethane (d = 0.5
-0.7), which is a 200-250% increase, and has the disadvantage of being heavy, and various attempts have been made to reduce the weight.
【０００３】一般に軟質塩化ビニル系樹脂には、化学発
泡剤を加え、成形時の熱により分解発生するガスにより
成形品内部に発泡セルを形成し軽量化する方法が取られ
る。[0003] In general, a method of adding a chemical foaming agent to a soft vinyl chloride resin and forming a foam cell inside a molded article by using a gas generated by decomposition during heating to reduce the weight is adopted.
【０００４】また、アルミノシリケート系等の中空のマ
イクロカプセルを軟質塩化ビニル系樹脂に加えて軽量化
する方法も取られる。[0004] A method of reducing the weight by adding a hollow microcapsule such as an aluminosilicate-based resin to a soft vinyl chloride-based resin has also been adopted.
【０００５】[0005]
【発明が解決しようとする課題】化学発泡剤を軟質ＰＶ
Ｃに配合し、これを成形することにより得られる成形品
は発泡倍率に制限があったり、わずかの条件の違いによ
り所期の発泡倍率が得られなかったりすることが有り、
また独立の発泡セルの他に相当割合で連続気泡を含むよ
うになる。また、成形品の部位により、発泡セルの不均
一が発生する。SUMMARY OF THE INVENTION A chemical foaming agent is used for soft PV.
C, the molded product obtained by molding this may have a limited expansion ratio, or the desired expansion ratio may not be obtained due to slight differences in conditions,
In addition to the independent foam cells, a considerable proportion of the cells contain open cells. Further, depending on the part of the molded product, unevenness of the foam cells occurs.
【０００６】また、押出し成形においては、押出し機内
で溶融樹脂に加圧状態で微細に分散されたガスがダイス
を出ると同時に急膨張するために、セルの膜がこの膨張
圧に耐え切れずにガス抜けを起こし、成形品の形状、表
面性を著しく劣化させるという問題を有し、発泡倍率の
限界は精々２倍程度であり、良好な成形品外観を得るに
は、発泡倍率が１．５倍程度以下に制限される。In the extrusion molding, a gas finely dispersed in a molten resin in a pressurized state in an extruder rapidly expands at the same time as exiting a die, so that the cell membrane cannot withstand the expansion pressure. It has the problem of causing outgassing and remarkably deteriorating the shape and surface properties of the molded article. The limit of the expansion ratio is at most about 2 times. It is limited to about twice or less.
【０００７】更に、化学発泡剤の分解により発生するガ
スにより、成形機及び金型に腐食等のトラブルが発生す
る事があり、また成形品自体が劣化し易くなったりする
等の問題点がある。Further, the gas generated by the decomposition of the chemical foaming agent may cause troubles such as corrosion in the molding machine and the mold, and the molded product itself may be easily deteriorated. .
【０００８】また、一方、アルミノシリケート系等の中
空のマイクロカプセルを添加したものは、均一な発泡セ
ルを有する成形品が得られるが、配合物をペレット化す
る段階で、マイクロカプセルの破壊が起こり、所期の軽
量化が確保されなかったり、造粒機のスクリュー、シリ
ンダーの摩耗を引き起こす事がある。また押出し成形に
おいては、成形機内での混練中のセルの破壊により所期
の軽量化が得られなかったり、成形機のシリンダー、ス
クリュー、ダイスの摩耗を引き起こす事がある。また、
ペレットの段階から材料の比重が軽く、梱包出荷時の容
量が通常の材料と比較して大きいという欠点を有する。
本発明者らは、上記組成物の欠点を克服すべく鋭意研究
の結果、軟質ＰＶＣに熱膨張性マイクロカプセルを配合
する事により、造粒時の機器の摩耗が無く、従来と同等
の比重値の成形用材とする事が出来、これを押出し成形
する事で成形時の熱により配合されたマイクロカプセル
が膨張し、比重値が軽く、従来に無い均一な発泡セルを
有する成形品が得られる事、また押出し成形時のガスの
発生によるトラブルや機器の摩耗も無く、従来に無い均
一な発泡セルを有する押出し成形品が得られる事を知
り、本発明を完成させるに至った。以上の説明から明ら
かなように本発明の目的は、上述の従来技術の問題点が
解消された、押出し成形用軟質塩化ビニル樹脂組成物を
提供することである。また、他の目的は、本発明の組成
物により押出し成形された物性の良好な成形品を提供す
ることである。[0008] On the other hand, a molded product having uniform foam cells can be obtained by adding hollow microcapsules such as aluminosilicate, but the microcapsules are broken at the stage of pelletizing the compound. However, the desired weight reduction may not be ensured, or the screws and cylinders of the granulator may be worn. In the extrusion molding, the desired weight reduction may not be obtained due to the breakage of the cells during kneading in the molding machine, or the cylinder, screw and die of the molding machine may be worn. Also,
There is a disadvantage that the specific gravity of the material is light from the stage of the pellet and the capacity at the time of packing and shipping is larger than that of a normal material.
The present inventors have conducted intensive studies to overcome the drawbacks of the above composition. As a result of blending the heat-expandable microcapsules with soft PVC, there is no wear of the equipment during granulation, and the specific gravity value is equivalent to that of the conventional one. By extruding this, the compounded microcapsules expand due to the heat generated during molding, resulting in a molded product having a lighter specific gravity value and an unprecedented uniform foam cell. Further, the present inventors have found that an extruded product having a uniform foam cell which has not been obtained before can be obtained without any trouble due to generation of gas at the time of extrusion molding and wear of equipment, and the present invention has been completed. As apparent from the above description, an object of the present invention is to provide a soft vinyl chloride resin composition for extrusion molding, which has solved the above-mentioned problems of the prior art. Another object is to provide a molded article extruded from the composition of the present invention and having good physical properties.
【０００９】[0009]
【課題を解決するための手段】本発明は、下記（１）な
いし（４）の構成を有する。The present invention has the following configurations (1) to (4).
【００１０】（１）平均重合度４００〜４０００の塩化
ビニル樹脂１００重量部、可塑剤２０〜２５０重量部、
その他の配合剤を配合した塩化ビニル系樹脂組成物１０
０重量部に対して、熱膨張性マイクロカプセルの充填剤
を０．１〜７０重量％配合した事を特徴とする発泡押出
し成形用軟質塩化ビニル系樹脂組成物。(1) 100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 400 to 4000, 20 to 250 parts by weight of a plasticizer,
Vinyl chloride resin composition containing other compounding agents 10
A soft vinyl chloride resin composition for foam extrusion molding, characterized in that 0.1 to 70% by weight of a filler for heat-expandable microcapsules is added to 0 part by weight.
【００１１】（２）前記（１）記載の軟質塩化ビニル系
樹脂組成物を用いた成形品。(2) A molded article using the soft vinyl chloride resin composition according to (1).
【００１２】（３）前記（１）記載の軟質塩化ビニル系
樹脂組成物を用いた押出し成形品。(3) An extruded product using the soft vinyl chloride resin composition according to (1).
【００１３】（４）熱膨張性マイクロカプセルが、塩化
ビニリデン−アクリロニトリル共重合体からなる外殻成
分中に膨張剤としてのイソペンタンを内包してなる未膨
張品である前記（１）に記載の組成物。(4) The composition according to the above (1), wherein the heat-expandable microcapsules are unexpanded products in which isopentane as a swelling agent is encapsulated in a shell component made of a vinylidene chloride-acrylonitrile copolymer. Stuff.
【００１４】[0014]
【発明の実施の形態】本発明に用いられる塩化ビニル樹
脂組成物には平均重合度が４００〜４０００のＰＶＣが
用いられる。ＰＶＣが平均重合度＜４００の場合は、機
械的物性が劣り、平均重合度＞４０００の場合には加工
性（流動性）の低下が著しくなる割りには機械的物性の
向上が少なくいずれも実用的でない。ここで、ＰＶＣと
は塩化ビニル単独重合体のみならず、塩化ビニルを主体
とする（塩化ビニルを５０％以上含有する）他のビニル
モノマーとの共重合体をも意味する。塩化ビニルを主体
とする共重合体に使用し得る他のビニルモノマーとして
は、塩化ビニリデン、酢酸ビニル、アクリル酸及びその
エステル、メタクリル酸及びそのエステル、アクリロニ
トリル、マレイン酸及びそのエステル、無水マレイン
酸、フマル酸及びそのエステル、エチレン、プロピレン
等のα−オレフィン、ビニルエーテル、ジアリルフタレ
ート、トリアリルシアヌレート等が例示される。更に、
このＰＶＣは、 塩化ビニルを主成分とする限りにおい
て上記単独重合体もしくは共重合体と他の樹脂との混合
物であっても良い。そのような他の樹脂としては、ポリ
塩化ビニリデン、エチレン・酢酸ビニル共重合体，ＮＢ
Ｒ、ＳＢＲ、ＡＢＳ、ＭＢＳ、塩素化ポリエチレン、ポ
リウレタン等比較的ＰＶＣと相溶性の良い樹脂が例示さ
れる。DESCRIPTION OF THE PREFERRED EMBODIMENTS PVC having an average degree of polymerization of 400 to 4000 is used for the vinyl chloride resin composition used in the present invention. When PVC has an average degree of polymerization of <400, the mechanical properties are inferior. When PVC has an average degree of polymerization of> 4000, the mechanical properties are little improved but the workability (fluidity) is significantly reduced. Not a target. Here, PVC means not only a vinyl chloride homopolymer but also a copolymer of vinyl chloride as a main component (containing 50% or more of vinyl chloride) with another vinyl monomer. Other vinyl monomers that can be used in the copolymer based on vinyl chloride include vinylidene chloride, vinyl acetate, acrylic acid and its ester, methacrylic acid and its ester, acrylonitrile, maleic acid and its ester, maleic anhydride, Examples thereof include fumaric acid and esters thereof, α-olefins such as ethylene and propylene, vinyl ether, diallyl phthalate, triallyl cyanurate and the like. Furthermore,
This PVC may be a mixture of the above homopolymer or copolymer and another resin as long as the main component is vinyl chloride. Such other resins include polyvinylidene chloride, ethylene / vinyl acetate copolymer, NB
Resins having relatively good compatibility with PVC, such as R, SBR, ABS, MBS, chlorinated polyethylene, and polyurethane, are exemplified.
【００１５】本発明に用いられる発泡塩化ビニル系樹脂
組成物には、塩化ビニリデン−アクリロニトリル共重合
体を外殻成分とし、膨張剤（発泡剤）としてイソペンタ
ンを内包した熱膨張性マイクロカプセルの未膨張品が配
合される。The foamed vinyl chloride resin composition used in the present invention has an unexpanded heat-expandable microcapsule containing a vinylidene chloride-acrylonitrile copolymer as an outer shell component and isopentane as an expanding agent (foaming agent). The product is compounded.
【００１６】熱膨張性マイクロカプセルの未膨張品は、
平均粒子径が微小であれば広い範囲から選ばれるが、通
常は３〜５０μｍ、好ましくは１０〜３０μｍのものが
良い。これが加熱により、その最大膨張温度で直径が４
倍、体積で６０倍、セル外殻厚みが０．１μｍに膨張す
る。平均粒子径が極端に小さい場合は、膨張率及び膨張
力が低くなる傾向があり、一方極端に大きいときは、得
られる成形物の表面性が悪くなる傾向がある。The unexpanded product of the heat-expandable microcapsules is as follows:
If the average particle diameter is very small, it is selected from a wide range, but usually 3 to 50 μm, preferably 10 to 30 μm. This results in a diameter of 4 at its maximum expansion temperature due to heating.
The cell outer shell thickness expands to 0.1 μm. When the average particle size is extremely small, the expansion coefficient and expansion force tend to be low, while when it is extremely large, the surface properties of the obtained molded article tend to be poor.
【００１７】熱膨張性マイクロカプセルは、膨張開始温
度が１１５℃以上（好ましくは１２０℃以上）、最大膨
張温度が１５０℃以上（好ましくは１６０℃以上）であ
ることが望ましい。上限は膨張開始温度が２００℃程度
まで、最大膨張温度が２５０℃程度までである。膨張開
始温度、最大膨張温度が余りに低いときは、ＰＶＣとの
予備混練による造粒の過程、及び押出し成形機に供給し
た際の初期の混練でマイクロカプセルが膨張を開始し、
これが破壊されてしまい、成形品において所期の発泡が
得られ難い。また、膨張開始温度、最大膨張温度が余り
に高いときには、通常のＰＶＣの成形温度範囲（１６０
〜２００℃）においてマイクロカプセルの発泡が起こり
難く、目的とする発泡成形品が得られない。The heat-expandable microcapsules preferably have an expansion start temperature of 115 ° C. or higher (preferably 120 ° C. or higher) and a maximum expansion temperature of 150 ° C. or higher (preferably 160 ° C. or higher). The upper limit is that the expansion start temperature is up to about 200 ° C and the maximum expansion temperature is up to about 250 ° C. When the expansion start temperature and the maximum expansion temperature are too low, the microcapsules start expanding in the process of granulation by pre-kneading with PVC, and the initial kneading when supplied to an extruder,
This is destroyed, and it is difficult to obtain the desired foaming in the molded product. If the expansion start temperature and the maximum expansion temperature are too high, the normal PVC molding temperature range (160
(−200 ° C.), foaming of the microcapsules hardly occurs, and a desired foamed molded product cannot be obtained.
【００１８】ここでいう膨張開始温度、最大膨張温度と
は、熱膨張性微小球を空気中で２０℃／ｍｉｎの条件で
昇温していった時にそれぞれ膨張が開始する温度、最大
膨張する時の温度を言う。尚、最大膨張後も膨張を続け
ると、熱膨張性微小球の潰壊が進み、全体として膨張率
が低下していく。The expansion start temperature and the maximum expansion temperature referred to here are the temperature at which expansion starts when the heat-expandable microspheres are heated in air at 20 ° C./min, and the maximum expansion temperature, respectively. Say the temperature. If the expansion is continued after the maximum expansion, the heat-expandable microspheres are crushed, and the expansion rate decreases as a whole.
【００１９】熱膨張性マイクロカプセル自体は以前から
幾つかの用途に使用されているが、従来のマイクロカプ
セルは、膨張開始温度が８０℃程度から１１５℃未満と
比較的低く、最大膨張温度も１２０℃程度から１５０℃
未満と比較的低いものであった。このような従来の熱膨
張性マイクロカプセルは、ＰＶＣとの予備混練における
造粒の過程、及び押出し成形機に供給した際の初期の混
練でマイクロカプセルが膨張を開始し、これが破壊され
てしまい、成形品において所期の発泡が得られず、押出
し成形には使用出来なかった。Although the heat-expandable microcapsules themselves have been used in some applications, the conventional microcapsules have a relatively low expansion start temperature of about 80 ° C. to less than 115 ° C. and a maximum expansion temperature of 120 ° C. ℃ to 150 ℃
And relatively low. Such conventional heat-expandable microcapsules, in the process of granulation in pre-kneading with PVC, and the initial kneading when supplied to an extruder, the microcapsules start expanding, which is destroyed, The desired foaming was not obtained in the molded product, and it could not be used for extrusion molding.
【００２０】このような熱膨張性マイクロカプセルは、
ＰＶＣ１００重量部に可塑剤を２０〜２５０重量部配合
したＰＶＣ組成物に対して、０．１〜７０重量％配合す
る事ができるが、直接押出し成形機に供する場合は、
０．１〜２０重量％が好ましい。熱膨張性マイクロカプ
セルの配合量が０．１重量％より少ないと、軽量化への
寄与が少なく、２０重量％を超えると押出し成形品の外
観が損なわれる事があるので好ましくない。但し、製品
外観が重要視されないものであれば、２０重量％を超え
て配合されても問題は無い。Such a heat-expandable microcapsule is
0.1 to 70% by weight can be blended with respect to a PVC composition in which 20 to 250 parts by weight of a plasticizer is blended with 100 parts by weight of PVC.
0.1-20% by weight is preferred. If the amount of the heat-expandable microcapsules is less than 0.1% by weight, the contribution to weight reduction is small, and if it exceeds 20% by weight, the appearance of the extruded product may be impaired, which is not preferable. However, if the appearance of the product is not regarded as important, there is no problem even if it exceeds 20% by weight.
【００２１】また、熱膨張性マイクロカプセルが配合さ
れた材料を、熱膨張性マイクロカプセルを配合していな
い材料と任意の割合で混合し、押出し成形機に供給し、
成形する事により、当初から熱膨張性マイクロカプセル
を配合した材料と同じ軽量化された成形品を得る事もで
きる。その場合、混合後の熱膨張性マイクロカプセルの
配合量は、上記と同様に成形品の外観が重要視される場
合は０．１重量％以上、２０重量％以下が好ましく、成
形品の外観が重要視されない場合は２０重量％を超えて
も良い。Further, the material containing the heat-expandable microcapsules is mixed at an optional ratio with the material not containing the heat-expandable microcapsules and supplied to an extruder.
By molding, it is also possible to obtain a molded article of the same weight as the material containing the thermally expandable microcapsules from the beginning. In this case, the blending amount of the heat-expandable microcapsules after mixing is preferably 0.1% by weight or more and 20% by weight or less when the appearance of the molded article is regarded as important as described above. If not considered important, it may exceed 20% by weight.
【００２２】本発明に用いられる塩化ビニル系組成物に
は、ＰＶＣ１００重量部に対して、２０〜２５０重量部
の可塑剤が配合される。使用する可塑剤には特別な制限
は無く、ＰＶＣに通常配合される可塑剤が、単独で、あ
るいは混合して使用できる。このような可塑剤の例とし
て、ジオクチルフタレート等のフタル酸エステル系可塑
剤、ジオクチルアジペート等のアジピン酸エステル系可
塑剤、トリオクチルトリメリテート等のトリメリット酸
系可塑剤、トリクレジルフォスフェート等のリン酸エス
テル系可塑剤、１，３−ブチレングリコールアジペート
等のポリエステル系可塑剤、更にはエポキシ化大豆油等
のエポキシ系可塑剤等が挙げられる。可塑剤の配合量が
２０重量部未満では造粒時の発熱により熱膨張性マイク
ロカプセルが膨張を開始し、更に押出し成形時のせん
断、及び発熱によりマイクロカプセルが破壊されてしま
い好ましくない。また２５０重量部を超すと可塑剤が成
形品の表面に滲み出るようになり好ましくない。The vinyl chloride composition used in the present invention contains 20 to 250 parts by weight of a plasticizer based on 100 parts by weight of PVC. There is no particular limitation on the plasticizer to be used, and plasticizers usually blended with PVC can be used alone or as a mixture. Examples of such a plasticizer include phthalate plasticizers such as dioctyl phthalate, adipic ester plasticizers such as dioctyl adipate, trimellitic acid plasticizers such as trioctyl trimellitate, and tricresyl phosphate. And plasticizers such as polyester plasticizers such as 1,3-butylene glycol adipate, and epoxy plasticizers such as epoxidized soybean oil. When the blending amount of the plasticizer is less than 20 parts by weight, the heat-expandable microcapsules start to expand due to heat generation during granulation, and further, the microcapsules are broken by shearing and heat generation during extrusion molding, which is not preferable. If it exceeds 250 parts by weight, the plasticizer undesirably oozes on the surface of the molded article.
【００２３】本発明に用いられる塩化ビニル系樹脂組成
物には、ＰＶＣに通常配合される安定剤、充填剤、滑
剤、加工助剤、紫外線吸収剤、顔料等を本発明の目的を
阻害しない範囲で配合することができる。In the vinyl chloride resin composition used in the present invention, stabilizers, fillers, lubricants, processing aids, ultraviolet absorbers, pigments, etc., which are usually compounded in PVC, are used in a range which does not impair the object of the present invention. Can be blended.
【００２４】本発明に用いられる塩化ビニル系樹脂組成
物は、上記ＰＶＣ、熱膨張性マイクロカプセル、可塑
剤、安定剤、その他の添加剤を公知の混合装置を用いて
混合して得られる。混合装置としては、リボンブレンダ
ー、Ｖ型ブレンダー、ヘンシェルミキサー（商標）等が
使用できる。更には公知の造粒装置を用いて混練造粒し
てもよく、造粒装置としては、単軸あるいはニ軸の押出
し機を用いて混練造粒しても良く、ロール加工シートか
らペレット化しても良い。The vinyl chloride resin composition used in the present invention is obtained by mixing the above-mentioned PVC, heat-expandable microcapsules, plasticizer, stabilizer and other additives using a known mixing device. As the mixing device, a ribbon blender, a V-type blender, a Henschel mixer (trademark) or the like can be used. Furthermore, kneading and granulating may be performed using a known granulating apparatus, and the granulating apparatus may be kneaded and granulated using a single-screw or twin-screw extruder, and pelletized from a rolled sheet. Is also good.
【００２５】前記の混合装置を用いて、本発明の塩化ビ
ニル系樹脂組成物を得るにあたり、熱膨張性マイクロカ
プセルの添加時期は特に制限を受けないが、好ましくは
昇温終了後、冷却時に１１５℃以下となった時点で添加
攪拌後、排出するのが良い。可塑剤を配合した通常のＰ
ＶＣ組成物は、可塑剤をＰＶＣ樹脂に吸収（ドライアッ
プ）させる目的で攪拌と同時に昇温を行うが、この時の
温度が１１５℃を超えると添加した熱膨張性マイクロカ
プセルが膨張を開始し、成形前の組成物の比重が減少
し、組成物の容積が大きくなり好ましくない。また、既
膨張の熱膨張性マイクロカプセルを配合した組成物を押
出し成形により成形すると、既膨張のマイクロカプセル
が成形時の圧力で破壊され、所期の発泡が得られない事
があり好ましくない。When the vinyl chloride resin composition of the present invention is obtained by using the above-mentioned mixing apparatus, the timing of adding the thermally expandable microcapsules is not particularly limited. When the temperature becomes lower than or equal to ° C., it is preferable to discharge the mixture after stirring. Normal P with plasticizer
The VC composition is heated simultaneously with stirring for the purpose of absorbing (drying up) the plasticizer into the PVC resin. If the temperature at this time exceeds 115 ° C., the added thermally expandable microcapsules start expanding. In addition, the specific gravity of the composition before molding decreases, and the volume of the composition increases, which is not preferable. In addition, when the composition containing the expanded thermally expandable microcapsules is molded by extrusion molding, the expanded microcapsules are broken by the pressure at the time of molding, and the desired foam may not be obtained.
【００２６】前記の造粒装置を用いて、本発明の塩化ビ
ニル系樹脂組成物を得るにあたり、造粒条件には特に制
限を受けないが、好ましくは１１５℃以下の樹脂温度に
て造粒するのが良い。造粒時の樹脂温度が１１５℃を超
えると、添加した熱膨張性マイクロカプセルが膨張を開
始し、成形前のペレットの比重が減少し、容積が大きく
なり好ましくない。また、既膨張のマイクロカプセルを
配合したペレットを押出し成形により成形すると、既膨
張のマイクロカプセルが成形時の圧力で破壊され、所期
の発泡が得られない事があり好ましくない。In obtaining the vinyl chloride resin composition of the present invention using the above granulating apparatus, granulation conditions are not particularly limited, but granulation is preferably performed at a resin temperature of 115 ° C. or lower. Is good. If the resin temperature at the time of granulation exceeds 115 ° C., the added thermally expandable microcapsules start to expand, the specific gravity of the pellets before molding decreases, and the volume increases, which is not preferable. Further, when the pellets containing the expanded microcapsules are molded by extrusion, the expanded microcapsules are broken by the pressure at the time of molding, and the desired foaming may not be obtained.
【００２７】本発明の押出し成形方法の対象となる成形
品は、通常のＰＶＣ組成物により得られる成形品であ
り、特に制限を受けない。但し、成形品の主な部分が１
ｍｍ以上の厚みを有する成形品が好ましい。成形品の厚
みが１ｍｍ未満では本発明の目的とする軽量化への寄与
が少なく好ましくない。このような成形品の例として
は、手摺り等の各種グリップ材、各種の家電建築部品、
防振材、パッキン、ガスケット類、各種の緩衝材、容
器、構造体等をはじめとする種々様々な用途に使用する
事ができる。The molded article to be subjected to the extrusion molding method of the present invention is a molded article obtained from an ordinary PVC composition, and is not particularly limited. However, the main part of the molded product is 1
A molded article having a thickness of at least mm is preferred. If the thickness of the molded article is less than 1 mm, the contribution to the weight reduction aimed at by the present invention is unfavorably small. Examples of such molded products include various grip materials such as handrails, various home appliance building components,
It can be used for various applications including vibration insulators, packings, gaskets, various cushioning materials, containers, structures and the like.
【００２８】前記のような成形品を得るための金型は、
大きさ、形状、構造に特別の制限はないが、ダイ内で急
激な圧の変動があると、この部分で急激なセルの膨張が
起こり、成形品の肉圧の不均一、密度の不均一等の現象
が生ずる事があり、ダイ内部での圧力の変化は、押出し
機先端よりダイ出口迄の間で均一に低下するようにする
のが好ましい。The mold for obtaining the molded product as described above is
There is no special restriction on the size, shape and structure, but if the pressure fluctuates rapidly in the die, rapid cell expansion will occur in this area, resulting in uneven wall pressure and uneven density of the molded product. Such a phenomenon may occur, and it is preferable that the change in pressure inside the die is uniformly reduced from the extruder tip to the die outlet.
【００２９】本発明の方法を実施するには、通常のＰＶ
Ｃ用押出し成形機、例えば単軸型、２軸型等の押出し成
形機、スクリューを用いる事ができる。In order to carry out the method of the present invention, ordinary PV
An extruder for C, for example, an extruder of a single-screw type, a twin-screw type or the like, or a screw can be used.
【００３０】前記の成形機と金型を用いて、前記の塩化
ビニル系樹脂組成物より成形品を得るにあたり、成形条
件としては、通常のＰＶＣ組成物の成形条件であれば、
特に制限を受けないが、好ましくは、シリンダー温度、
ダイスの形状、スクリュー回転数等を考慮して、樹脂温
度が熱膨張性マイクロカプセルの最大膨張温度である１
６０〜１８０℃程度となるように設定するのが良い。樹
脂温度が１６０℃より低いと熱膨張性マイクロカプセル
が最大膨張に達せず、所期の発泡が得られず、樹脂温度
が１８０℃を超えると押出し成形機に供給した際の初期
の混練で熱膨張性マイクロカプセルが膨張を開始し、こ
れが破壊されてしまい、成形品において所期の発泡が得
られ難い事がある。更に１９０℃を超えると、熱膨張性
マイクロカプセルの外郭成分が変色を起こす可能性があ
り好ましくない。In obtaining a molded article from the vinyl chloride resin composition using the molding machine and the mold, the molding conditions may be any of the ordinary PVC composition molding conditions.
Although not particularly limited, preferably, the cylinder temperature,
The resin temperature is the maximum expansion temperature of the heat-expandable microcapsules in consideration of the shape of the die, the screw rotation speed, and the like.
It is preferable to set the temperature to about 60 to 180 ° C. When the resin temperature is lower than 160 ° C., the heat-expandable microcapsules do not reach the maximum expansion and the desired foaming cannot be obtained. The expandable microcapsules start expanding and are broken, and it may be difficult to obtain the desired foaming in the molded product. If the temperature exceeds 190 ° C., the outer components of the heat-expandable microcapsules may be discolored, which is not preferable.
【００３１】[0031]
【実施例】以下、実施例及び比較例によって、本発明を
更に説明するが、本発明はこれらによって限定されるも
のではない。尚、各例で用いた機器及び物性の測定法は
以下の通りである。 （１）．押出し成形機：日本製鋼所製Ｐ４０−２２ＡＢ
Ｗ型（Ｌ／Ｄ＝２２） （２）．スクリュー：４０φｍｍ、Ｃ．Ｒ＝３．５、フ
ルフライト （３）．ダイス：３ｍｍ厚×４０ｍｍ幅平板プレート （４）．比重：成形した試料片から２０×３０ｍｍの試
験片（厚さは試験片自身の厚さ）を切り取り、ＪＩＳ
Ｋ ７１１２に依り測定。 （５）．外観：成形した試験片の表面を目視で観察し、
ブツ、波ムラ、膨れ、サメ肌、流れ模様、カスレ等の外
観異常の全く無いものを◎、わずかに異常が認められる
が殆ど問題の無いものを○、表面の一部に異常のあるも
のを△、表面の大部分に異常のあるものを×と判定し
た。The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited to these examples. The instruments used in each example and methods for measuring physical properties are as follows. (1). Extrusion molding machine: Japan Steel Works P40-22AB
W type (L / D = 22) (2). Screw: 40 mm, C.I. R = 3.5, full flight (3). Dies: 3 mm thick x 40 mm wide flat plate (4). Specific gravity: A test piece of 20 × 30 mm (thickness is the thickness of the test piece itself) is cut out from the molded sample piece, and is subjected to JIS.
Measured according to K 7112. (5). Appearance: Visually observe the surface of the molded test piece,
◎: No appearance abnormality such as bumps, uneven waves, blisters, shark skin, flow pattern, blurring, etc., ○: Slight abnormality but little problem, ○: Part of surface Δ, those having an abnormality on most of the surface were judged as x.
【００３２】実施例１〜６、比較例１〜５ 平均重合度１３００のＰＶＣ（チッソ（株）製、商標名
ニポリットＳＭ）、若しくは平均重合度２５００のＰＶ
Ｃ（チッソ（株）製、商標名ニポリットＣＬ）１００重
量部に、エポキシ化大豆油２重量部、重質炭酸カルシウ
ム充填剤１０重量部、Ｂａ−Ｚｎ系複合安定剤２重量
部、ＰＭＭＡ系加工助剤５重量部、及びカーボンブラッ
ク１重量部に対して、各々表１に示したようにＤＩＮ
Ｐ、アゾジカルボンアミド系化学発泡剤、及び熱膨張性
マイクロカプセル（外郭成分：耐熱性アクリロニトリル
共重合体、内包発泡剤：ｎ−ペンタン、膨張開始温度：
１２０℃、最大膨張温度：１９０℃、平均粒径３０±５
μｍ）の添加量を変更して配合し、ヘンシェルミキサー
（商品名）で混合し、塩化ビニル系樹脂組成物を得た。
尚、化学発泡剤、及び熱膨張性マイクロカプセルは、こ
れ以外の配合剤を攪拌、昇温し、 ドライアップさせた
後、冷却の時点で１１５℃以下の温度迄下がった時点で
投入し攪拌し、６０℃でミキサーより排出した。更に、
この塩化ビニル系樹脂組成物を６５ｍｍ単軸押出し機で
混練し、造粒したものを押出し成形機に供した。Examples 1 to 6 and Comparative Examples 1 to 5 PVC having an average degree of polymerization of 1300 (manufactured by Chisso Corp., trade name Nipolit SM) or PV having an average degree of polymerization of 2500
100 parts by weight of C (manufactured by Chisso Corp., Nipolit CL), 2 parts by weight of epoxidized soybean oil, 10 parts by weight of heavy calcium carbonate filler, 2 parts by weight of Ba-Zn composite stabilizer, PMMA processing As shown in Table 1, DIN was added to 5 parts by weight of the auxiliary and 1 part by weight of carbon black, respectively.
P, azodicarbonamide-based chemical foaming agent, and heat-expandable microcapsules (outer component: heat-resistant acrylonitrile copolymer, encapsulated foaming agent: n-pentane, expansion start temperature:
120 ° C, maximum expansion temperature: 190 ° C, average particle size 30 ± 5
μm), and mixed with a Henschel mixer (trade name) to obtain a vinyl chloride resin composition.
In addition, the chemical foaming agent and the heat-expandable microcapsules were prepared by stirring, heating, and drying up the other compounding agents. At 60 ° C. from the mixer. Furthermore,
This vinyl chloride resin composition was kneaded with a 65 mm single screw extruder, and the granulated product was supplied to an extruder.
【００３３】前記の押出し成形機、金型を使用し、スク
リュー回転数３０ｒｐｍ、樹脂温度１６０℃にて、得ら
れた成形品に関して配合と物性評価の結果を表１に示し
た。Table 1 shows the results of the blending and evaluation of the physical properties of the obtained molded product at a screw rotation speed of 30 rpm and a resin temperature of 160 ° C. using the above-mentioned extrusion molding machine and mold.
【００３４】[0034]
【表１】 [Table 1]
【００３５】[0035]
【発明の効果】表１に示されたように、本発明によれ
ば、通常の押出し成形方法により、表面性が良好で、連
続気泡を有せず、成形品全体に均一な独立気泡を有し、
比重値が低い、これまでには無い軽量化された軟質塩化
ビニル成形品を得ることが出来る。As shown in Table 1, according to the present invention, according to the conventional extrusion molding method, the surface properties are good, there are no open cells, and uniform closed cells are formed throughout the molded article. And
It is possible to obtain an unprecedented and lightweight soft vinyl chloride molded article having a low specific gravity.
【００３６】押出し成形が可能となった事で、寸法精度
の高い製品の大量生産が可能となり、単純な形状から複
雑な形状に至る任意の形状の成形品が短時間で得る事が
できる。Since the extrusion molding has become possible, it is possible to mass-produce products having high dimensional accuracy, and it is possible to obtain a molded article having any shape from a simple shape to a complicated shape in a short time.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２９Ｋ 27:06 105:04 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI B29K 27:06 105: 04
Claims (4)
ル樹脂１００重量部、可塑剤２０〜２５０重量部、その
他の配合剤を配合した塩化ビニル系樹脂組成物１００重
量部に対して、熱膨張性マイクロカプセルの充填剤を
０．１〜７０重量％配合した事を特徴とする発泡押出し
成形用軟質塩化ビニル系樹脂組成物。1. A resin having a thermal expansion property of 100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 400 to 4000, 20 to 250 parts by weight of a plasticizer, and 100 parts by weight of a vinyl chloride resin composition containing other compounding agents. A soft vinyl chloride resin composition for foam extrusion molding, characterized in that 0.1 to 70% by weight of a filler for microcapsules is blended.
を用いた成形品。2. A molded article using the soft vinyl chloride resin composition according to claim 1.
を用いた押出し成形品。3. An extruded product using the soft vinyl chloride resin composition according to claim 1.
リデン−アクリロニトリル共重合体からなる外殻成分中
に膨張剤としてのイソペンタンを内包してなる未膨張品
である請求項１に記載の組成物。4. The composition according to claim 1, wherein the heat-expandable microcapsules are unexpanded products in which isopentane as a swelling agent is contained in a shell component made of a vinylidene chloride-acrylonitrile copolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9237661A JPH1160868A (en) | 1997-08-19 | 1997-08-19 | Vinyl chloride resin composition for foam extrusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9237661A JPH1160868A (en) | 1997-08-19 | 1997-08-19 | Vinyl chloride resin composition for foam extrusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1160868A true JPH1160868A (en) | 1999-03-05 |
Family
ID=17018642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9237661A Pending JPH1160868A (en) | 1997-08-19 | 1997-08-19 | Vinyl chloride resin composition for foam extrusion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1160868A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006336167A (en) * | 2005-06-03 | 2006-12-14 | Toyota Motor Corp | Fiber-constituted material, soundproof material and method for producing the same |
| US7232607B2 (en) | 2000-04-28 | 2007-06-19 | Kureha Corporation | Thermally foamable microsphere and production process thereof |
| US7252882B2 (en) | 2000-04-28 | 2007-08-07 | Kureha Corporation | Thermally foamable microsphere and production process thereof |
| JP2009281128A (en) * | 2008-05-26 | 2009-12-03 | Kg Paltec Co Ltd | Handrail covering material |
| CN102619080A (en) * | 2012-04-01 | 2012-08-01 | 东华大学 | Preparation method of graphene coating polyacrylonitrile fiber composite material |
| JP2015151407A (en) * | 2014-02-10 | 2015-08-24 | 出光ユニテック株式会社 | Foamable resin composition, foamed material, multilayer sheet and foam molding |
| JP2017179071A (en) * | 2016-03-29 | 2017-10-05 | 日本ゼオン株式会社 | Vinyl chloride resin composition and laminate |
| US9902848B2 (en) | 2014-01-17 | 2018-02-27 | Mitsubishi Chemical Corporation | Vinyl chloride resin composition and vinyl chloride resin molded article |
| CN109161121A (en) * | 2018-07-05 | 2019-01-08 | 何亚龙 | A kind of polyvinyl chloride wood plastic flame-retardant composite board material and preparation method |
| CN112625378A (en) * | 2020-12-19 | 2021-04-09 | 界首市鑫豪塑胶有限公司 | Light floor leather substrate prepared by micro-foaming technology |
-
1997
- 1997-08-19 JP JP9237661A patent/JPH1160868A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7232607B2 (en) | 2000-04-28 | 2007-06-19 | Kureha Corporation | Thermally foamable microsphere and production process thereof |
| US7252882B2 (en) | 2000-04-28 | 2007-08-07 | Kureha Corporation | Thermally foamable microsphere and production process thereof |
| JP2006336167A (en) * | 2005-06-03 | 2006-12-14 | Toyota Motor Corp | Fiber-constituted material, soundproof material and method for producing the same |
| JP2009281128A (en) * | 2008-05-26 | 2009-12-03 | Kg Paltec Co Ltd | Handrail covering material |
| CN102619080A (en) * | 2012-04-01 | 2012-08-01 | 东华大学 | Preparation method of graphene coating polyacrylonitrile fiber composite material |
| US9902848B2 (en) | 2014-01-17 | 2018-02-27 | Mitsubishi Chemical Corporation | Vinyl chloride resin composition and vinyl chloride resin molded article |
| JP2015151407A (en) * | 2014-02-10 | 2015-08-24 | 出光ユニテック株式会社 | Foamable resin composition, foamed material, multilayer sheet and foam molding |
| JP2017179071A (en) * | 2016-03-29 | 2017-10-05 | 日本ゼオン株式会社 | Vinyl chloride resin composition and laminate |
| CN109161121A (en) * | 2018-07-05 | 2019-01-08 | 何亚龙 | A kind of polyvinyl chloride wood plastic flame-retardant composite board material and preparation method |
| CN112625378A (en) * | 2020-12-19 | 2021-04-09 | 界首市鑫豪塑胶有限公司 | Light floor leather substrate prepared by micro-foaming technology |
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