【発明の詳細な説明】[Detailed description of the invention]
(産業上の利用分野)
本発明は皮革代替用塩化ビニル樹脂組成物、特
に靴底用素材として改質された塩化ビニル樹脂組
成物に関するものである。
(従来技術とその問題点)
近年、合成靴底用素材として安価な塩化ビニル
樹脂や高価なウレタン樹脂等の合成靴底が汎用さ
れているが、前者の塩化ビニル底は牛皮等との接
着性が悪く縫製仕上を必要としたり、雨天や凍結
時の路上ではスリツプし易い、製品の仕上がり外
観性が悪い等の欠点が多いため、塩化ビニル底に
代え、ウレタン底を使用する傾向にある。
一方、皮革工業の副生品として生産される膠ま
たはゼラチンの用途は制限的であり、合成接着剤
に押され、その生産量は減少の一途にある。かか
る膠またはゼラチンは従来、天然ゴムまたは合成
ゴムの透湿性の改善を図るためにゴム100部に対
して20部以上100部を混合する技術(日本特許公
告公報昭和46年(1971)第37412号/昭和ゴム株
式会社)、合成ゴムラテツクスに対して膠水溶液
を混合して帯電防止作用に優れたゴム組成物を得
る技術(日本特許公告公報昭和47年(1972)第
8367号/日本合成ゴム株式会社)、合成樹脂粉末、
粘土、炭酸石灰粉末、陶土、木粉等の主材を練成
して成形するためにバインダーとして膠溶液を使
用する技術(日本特許公告公報昭和47年(1972)
第8367号/新開一男)、ポリウレタン系樹脂に対
して蛋白誘導体を混合して透湿性のある包帯等の
医学用途材料を提供する技術(日本特許公開公報
昭和58年(1983)第87153号/シートン・カンパ
ニー)が開示されているが、一般合成樹脂とは容
易に均質混合されないため、合成樹脂改質剤とし
ての用途には限界があるとされていた。
しかし、ウレタン底を使用しても合成靴底とし
ての耐油性は今一歩であるし、特にコスト高とな
る欠点がある。
(解決すべき課題)
本発明は安価な塩化ビニル樹脂を基本素材とし
て用い、ウレタン底以上の牛皮靴材に変わる得る
新規な靴素材を提供せんとするものである。
(発明の構成)
本発明は塩化ビニル底改質材として射出成形前
に皮革工業副生品として産出される膠またはゼラ
チンを塩化ビニル靴底素材に所定量均質混合して
射出成形すると、驚くべきことに塩化ビニル樹脂
100重量部に対し膠またはゼラチンを乾燥重量と
して1〜10重量部の範囲で塩化ビニル底の欠点と
して挙げられていた接着性、スリツプ性、外観性
が改質され牛皮靴底に匹敵する合成靴底が製造さ
れることを見出し、完成されたもので、その要旨
とするところは「塩化ビニル樹脂100重量部に対
し膠またはゼラチンを乾燥重量にして1〜10重量
部均質混合してなることを特徴とする皮革代替用
塩化ビニル樹脂組成物」にある。
本発明組成物は、靴底材としてだけでなく、中
底材甲材等のその他皮革用途に使用できるもので
ある。
本明細書において、「塩化ビニル樹脂」とは塩
化ビニル底用等合成レザー素材として使用されて
いる合成素材を意味し、広く一般に市販されてい
るものを使用することができる。
通常、塩化ビニル樹脂に可塑剤、安定剤、充填
剤、顔料等が配合されている。本発明において、
最も一般的な配合組成は、塩化ビニル樹脂(重合
度は使用用途によつて選択されるが、靴底用とし
ては1600以上が好ましい)100部に対し、可塑剤
80〜100部、その他適量の発泡剤、安定剤、着色
剤を含む。
「膠またはゼラチン」とは皮革工業副生品とし
て供出されており、乾燥チツプまたはペレツトと
して、水分含有するものとしては工業用ゼラチン
として広く一般に市販されているものを使用する
ことができる。その配合量は塩化ビニル樹脂100
重量部に対し乾燥重量にして1重量部から改質効
果が顕れ、配合量が増加するにつれて塩化ビニル
底の硬さを増大させる。ただ、混合、射出成形等
の工程作業性を考慮すると、10重量部までが適当
である。
本発明に係る改質樹組成物は、一般に原料組成
物の溶融混合→冷却→押出加工成形の工程により
製造されるが、塩化ビニル樹脂、可塑剤、膠また
はゼラチン溶液あるいはゼリーを混合時のミキサ
ー温度を70〜120℃で混練した後、安定剤および
充填剤を添加混合して熟成し、各成分が均質に混
合できるように十分に加熱状態で混合するのがよ
い。
(実施例 1)
塩化ビニル樹脂チツプ100重量部に対し50%水
分の工業用ゼラチンを乾燥重量にして2.5重量部
配合し、工業用ミキサーにて加熱均質混合して通
常の靴底射出成形機にて合成靴底を製造した。
(実施例 2)
塩化ビニル樹脂チツプ100重量部に対し50%水
分工業用ゼラチンを乾燥重量にして5重量部配合
する以外は実施例1と同様にして合成靴底を製造
した。
(実施例 3)
塩化ビニル樹脂チツプ100重量部に対し50%水
分工業用ゼラチンを乾燥重量にして7.5重量部配
合する以外は実施例1と同様にして合成靴底を製
造した。
(実施例 4)
塩化ビニル樹脂チツプ100重量部に対し50%水
分工業用ゼラチンを乾燥重量にして10重量部配合
する以外は実施例1と同様にして合成靴底を製造
した。
(実施例 5)
塩化ビニル樹脂チツプ100重量部に対し50%水
分工業用ゼラチンを乾燥重量にして1重量部を配
合する以外は実施例1と同様にして合成靴底を製
造した。
(実施例 6〜10)
塩化ビニル樹脂チツプ100重量部に対し固形膠
チツプ1重量部、2.5重量部、5重量部、7.5重量
部、10重量部を各々配合し、実施例1と同様にし
て合成靴底を製造した。
(発明の作用効果)
実施例1〜10で製造した合成靴底を用いて、靴
を製造し、塩化ビニル底(従来品)との接着性、
スリツプ性、外観性、耐油性、摩耗性等の靴底特
性について比較した。結果は次の通りである。
(1) 接着性
本発明に係る靴底は従来の塩化ビニル底より牛
皮との接着性に優れ、特に縫製仕上げを施さずと
も通常の使用期間中では接着が剥離しないことが
確認された。
(2) スリツプ性
本発明に係る靴底は従来の塩化ビニル底より雨
天または凍結路面に対しスリツプしないことが確
認された。
(スリツプ試験例)
O−Y Pull−Slip−Meter(日本国、大阪市
在廣本機工製スリツプ実用試験機)にて所定の試
験荷重下に下記製法により成形した改質コンパウ
ンド(水分50%工業用ゼラチン10部含有)を用い
調整した所定寸法の試験片と、ゼラチンを含まな
い同一靴底用塩化ビニル樹脂コンパウンドからな
る同寸法の比較試験片との引つ張りに対する摩擦
抵抗の変化を試験した。第1図は本発明に係る改
質された塩化ビニル樹脂組成物試験片と、膠また
はゼラチンを含有しない塩化ビニル樹脂組成物比
較試験片とのスリツプ試験結果を示すチヤートグ
ラフである。
かかる結果より、本発明に係る試験片において
は、摩擦抵抗が高く(最大57Kg)、かつ持続性を
示すのに対し、従来の比較試験片は摩擦抵抗が30
Kg程度と比較的低く、かつその摩擦抵抗にも持続
性が見られない。したがつて、本発明に係る靴底
用組成物は履物用成形組成物としてスリツプ特性
に優れることがわかる。
試験用塩化ビニル樹脂コンパウンド組成
塩化ビニル樹脂(高重合1600以上) 100部
可塑剤(DOP,DOA,D−160) 80部
安定剤(Ba−Zn) 3部
充填剤(CaCO3) 15部
(以上10%許容)
工業用ゼラチン(50%水分) 10部
製 法
塩化ビニル樹脂、可塑剤、工業用ゼラチンをそ
れぞれミキサーに充填してミキサー温度を80℃程
度に保持しつつブレンドし、ついで安定剤および
充填剤を充填してブレンドし、十分に水分が蒸発
するまで熟成した後、冷却して押し出し成形して
靴底用塩化ビニル樹脂改質コンパウンドを製造
し、試験片を調整した。
(3) 外観性
本発明に係る靴底は従来の塩化ビニル底より外
観肌がきめ細かく上級品質感を呈していた。
(4) 耐油性
本発明に係る靴底は従来の塩化ビニル底より工
業油に対し耐久性があることが確認された。
(5) 摩耗性
本発明に係る靴底は従来の塩化ビニル底より摩
耗しやすいが、これは天然皮靴底に似た使用感を
与え、むしろ靴底として適当であるが確認され
た。
(6) 屈曲耐性
靴底用塩化ビニル樹脂改質コンパウンド(工業
用ゼラチン5部含有)を用いて靴底を成形し、−
30℃で靴底用の通常の屈曲試験を行つた。1万回
屈曲においても亀裂が見られず、優れた屈曲性を
示すことがわかつた。
以上の結果から明らかなように、本発明に係る
素材は高価なウレタン材を越える特性を安価な塩
化ビニル樹脂を用いて提供することができるの
で、画期的である。
ちなみに、一般塩ビ靴底材との物性を比較する
と、下記第1表のとおりである。
(Industrial Application Field) The present invention relates to a vinyl chloride resin composition for use as a substitute for leather, particularly to a vinyl chloride resin composition modified as a material for shoe soles. (Prior art and its problems) In recent years, synthetic shoe soles made of inexpensive vinyl chloride resin and expensive urethane resin have been widely used as materials for synthetic shoe soles, but the former vinyl chloride soles have poor adhesion to cowhide, etc. There are many disadvantages such as poor quality and the need for a sewn finish, the tendency to slip on the road in rainy or frozen weather, and poor finished product appearance, so there is a tendency to use urethane soles instead of vinyl chloride soles. On the other hand, the uses of glue or gelatin, which are produced as by-products of the leather industry, are limited, and their production volume continues to decline as they are overtaken by synthetic adhesives. In order to improve the moisture permeability of natural rubber or synthetic rubber, such glue or gelatin has conventionally been used in a technique of mixing 20 parts or more to 100 parts of rubber (Japanese Patent Publication No. 37412 of 1971). /Showa Rubber Co., Ltd.), a technology to obtain a rubber composition with excellent antistatic effect by mixing an aqueous glue solution with synthetic rubber latex (Japanese Patent Publication No. 1972)
No. 8367/Japan Synthetic Rubber Co., Ltd.), synthetic resin powder,
Technology of using glue solution as a binder to knead and mold main materials such as clay, carbonated lime powder, china clay, and wood powder (Japanese Patent Publication 1972)
No. 8367 / Kazuo Shinkai), technology for providing medical materials such as moisture-permeable bandages by mixing protein derivatives with polyurethane resin (Japanese Patent Publication No. 1983 (1983) No. 87153 / Seton・Company) has been disclosed, but because it cannot be easily mixed homogeneously with general synthetic resins, its use as a synthetic resin modifier was thought to be limited. However, even if a urethane sole is used, the oil resistance of a synthetic shoe sole is still not as good as that of a synthetic shoe sole, and the sole has the drawback of being particularly costly. (Problems to be Solved) The present invention aims to provide a new shoe material that uses inexpensive vinyl chloride resin as a basic material and can replace cowhide shoe materials with urethane soles or higher. (Structure of the Invention) The present invention provides a surprising result when a predetermined amount of glue or gelatin produced as a by-product of the leather industry is homogeneously mixed into a vinyl chloride sole material before injection molding as a vinyl chloride sole modifying material. especially vinyl chloride resin
Synthetic shoes that have improved adhesion, slip properties, and appearance, which were cited as disadvantages of vinyl chloride soles, by adding glue or gelatin in a dry weight range of 1 to 10 parts by weight to 100 parts by weight, and which are comparable to cowhide soles. It was discovered that the bottom could be manufactured and was completed, and the gist of it is ``100 parts by weight of vinyl chloride resin and 1 to 10 parts by dry weight of glue or gelatin are homogeneously mixed together. "Featured vinyl chloride resin composition for leather substitute". The composition of the present invention can be used not only as a shoe sole material, but also for other leather applications such as insole materials and upper materials. In this specification, "vinyl chloride resin" refers to a synthetic material used as a synthetic leather material for vinyl chloride bottoms, etc., and a wide variety of commercially available resins can be used. Usually, plasticizers, stabilizers, fillers, pigments, etc. are blended with vinyl chloride resin. In the present invention,
The most common compounding composition is 100 parts of vinyl chloride resin (the degree of polymerization is selected depending on the intended use, but for shoe soles it is preferably 1600 or higher) and a plasticizer.
Contains 80 to 100 parts and appropriate amounts of blowing agents, stabilizers, and coloring agents. "Glue or gelatin" is provided as a by-product of the leather industry, and as dry chips or pellets containing moisture, commercially available industrial gelatin can be used. Its blending amount is 100% vinyl chloride resin.
The modifying effect becomes apparent from 1 part by weight on a dry weight basis, and as the amount added increases, the hardness of the vinyl chloride sole increases. However, considering the workability of processes such as mixing and injection molding, up to 10 parts by weight is appropriate. The modified wood composition according to the present invention is generally produced by the process of melt mixing → cooling → extrusion molding of raw material compositions. After kneading at a temperature of 70 to 120°C, stabilizers and fillers are added and mixed, and the mixture is aged, and the mixture is preferably heated sufficiently so that each component can be homogeneously mixed. (Example 1) 2.5 parts by dry weight of industrial gelatin with 50% water content was blended with 100 parts by weight of vinyl chloride resin chips, heated and homogeneously mixed in an industrial mixer, and then put into a normal shoe sole injection molding machine. manufactured synthetic shoe soles. (Example 2) A synthetic shoe sole was produced in the same manner as in Example 1, except that 5 parts by weight of 50% water industrial gelatin (dry weight) was blended with 100 parts by weight of vinyl chloride resin chips. (Example 3) A synthetic shoe sole was produced in the same manner as in Example 1, except that 7.5 parts by weight of 50% moisture industrial gelatin (dry weight) was blended with 100 parts by weight of vinyl chloride resin chips. (Example 4) A synthetic shoe sole was produced in the same manner as in Example 1, except that 10 parts by weight of industrial gelatin with a moisture content of 50% was blended in a dry weight of 10 parts by weight with respect to 100 parts by weight of vinyl chloride resin chips. (Example 5) A synthetic shoe sole was produced in the same manner as in Example 1, except that 1 part by weight of industrial gelatin with a moisture content of 50% was blended with 100 parts by weight of vinyl chloride resin chips in the same manner as in Example 1. (Examples 6 to 10) 1 part by weight, 2.5 parts by weight, 5 parts by weight, 7.5 parts by weight, and 10 parts by weight of solid glue chips were respectively blended with 100 parts by weight of vinyl chloride resin chips, and the same procedure as in Example 1 was carried out. Manufactured synthetic shoe soles. (Operations and Effects of the Invention) Shoes were manufactured using the synthetic shoe soles manufactured in Examples 1 to 10, and the adhesiveness with the vinyl chloride sole (conventional product) was evaluated.
Sole properties such as slip resistance, appearance, oil resistance, and abrasion resistance were compared. The results are as follows. (1) Adhesion The shoe sole according to the present invention has superior adhesion to cowhide than conventional vinyl chloride soles, and it was confirmed that the adhesion does not peel off during normal use even without sewing. (2) Slip property It was confirmed that the sole of the present invention does not slip more easily on rainy days or on frozen road surfaces than conventional vinyl chloride soles. (Slip test example) A modified compound (water 50% industrial Changes in frictional resistance against tension were tested between a test piece of a predetermined size prepared using gelatin (containing 10 parts of gelatin) and a comparative test piece of the same size made of the same vinyl chloride resin compound for shoe soles that does not contain gelatin. . FIG. 1 is a chart graph showing the slip test results of a test piece of a modified vinyl chloride resin composition according to the present invention and a comparative test piece of a vinyl chloride resin composition containing no glue or gelatin. These results show that the test piece according to the present invention has a high frictional resistance (up to 57 kg) and is durable, whereas the conventional comparative test piece has a frictional resistance of 30 kg.
It is relatively low at around Kg, and its frictional resistance does not seem to be sustainable. Therefore, it can be seen that the composition for shoe soles according to the present invention has excellent slip properties as a molding composition for footwear. Composition of vinyl chloride resin compound for testing Vinyl chloride resin (high polymerization 1600 or more) 100 parts Plasticizer (DOP, DOA, D-160) 80 parts Stabilizer (Ba-Zn) 3 parts Filler (CaCO3) 15 parts (more than 10 % permissible) Industrial gelatin (50% water) 10 parts Manufacturing method PVC resin, plasticizer, and industrial gelatin are each charged into a mixer and blended while maintaining the mixer temperature at approximately 80°C, followed by stabilizer and filling. After filling and blending the compound, the mixture was aged until water was sufficiently evaporated, cooled and extruded to produce a vinyl chloride resin modified compound for shoe soles, and test pieces were prepared. (3) Appearance The sole of the present invention had a finer appearance and a higher quality feel than the conventional vinyl chloride sole. (4) Oil resistance It was confirmed that the shoe sole according to the present invention is more durable against industrial oil than the conventional vinyl chloride sole. (5) Wearability Although the sole according to the present invention is more easily worn than the conventional vinyl chloride sole, it has been confirmed that it provides a feeling similar to that of a natural leather sole, and is therefore more suitable as a shoe sole. (6) Bending resistance A shoe sole is molded using a modified vinyl chloride resin compound (containing 5 parts of industrial gelatin) for shoe soles, and -
A normal flex test for shoe soles was carried out at 30°C. No cracks were observed even after bending 10,000 times, indicating excellent flexibility. As is clear from the above results, the material according to the present invention is revolutionary because it can provide properties superior to expensive urethane materials using inexpensive vinyl chloride resin. Incidentally, a comparison of the physical properties with general PVC shoe sole materials is as shown in Table 1 below.
【表】
次に、本発明組成物を使用した塩ビ靴底と他の
素材を利用した靴底との物性を比較すると、下記
第2表の通りである。[Table] Next, the physical properties of a PVC shoe sole using the composition of the present invention and a shoe sole using other materials are compared as shown in Table 2 below.
【表】
なお、本発明は靴底用材の実施例を用いて説明
したが、塩ビレザーの当業者であれば、本発明の
要旨を逸脱せず、中底材、甲材等他の皮革用途組
成物を製造することができるのはもちろんであ
る。[Table] Although the present invention has been explained using examples of shoe sole materials, those skilled in the art of PVC leather will be able to apply it to other leather uses such as insole materials and upper materials without departing from the gist of the present invention. Of course, compositions can also be manufactured.
【図面の簡単な説明】[Brief explanation of the drawing]
第1図は本発明に係る改質された塩化ビニル樹
脂組成物試験片と、膠またはゼラチンを含有しな
い塩化ビニル樹脂組成物比較試験片とのスリツプ
試験結果を示すチヤートグラフである。
FIG. 1 is a chart graph showing the slip test results of a test piece of a modified vinyl chloride resin composition according to the present invention and a comparative test piece of a vinyl chloride resin composition containing no glue or gelatin.