ビニルスポンジレザ-における水の可塑剤(軟化剤)的効果
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概要
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It is impossible to take a roll kneading process in blending of water in raw materials compounds batch when we make of soft PVC sheet, leather cloth or sponge leather cloth.There are reasons that it is incompatible in compounds batch, water is evaporating out from PVC film or sheet in processing at 150°C and becomes unevenness on surface of the products.In this report, the author noted to a phenomenon of hazing or felt a slightly soften of PVC product influenced by water.Preparing of PVC sponge leather cloth, and it make to absorb water to the leather cloth, and observed some effects as a softner of water for the leather cloth.That is, PVC sponge leather cloth is dipped in hot water, it makes to soften at high temperature-it accelerate micro-Brownian motion actively - and tried to absorb water to PVCs ponge leather cloth used as a carrier of plasticizer, stabilizer and the other additives or a partially decomposed materials included in PVC sponge leather cloth.It was cleared the following results to soften of PVC sponge leather cloth dipped in hot water.(1) Degree of softness becomes larger according as in higher temperature of water.(2) Degree of softness becomes larger in agitation than in statical state.(3) Regardless of temperature, absorption of water reached to equilibrate at about 12 minute.(4) Absorption of water was about 11-12% at a reasonable conditions, that softning effect was corresponded to use same quantity of plasticizer for PVC layer.(5) Temperature of dipping water are desirable at maximum temperature as a degree of no change of appearance of a product, that is effective at about 60°C of around of second order transition point.(6) Absorbed water keeping terms in a product is 2 years over.(7) Softnning of base cloth are not contribute to soften for PVC layer. However, it is no factor as minus for PVC layer.Above mentioned, it would be say that hot water dipping treatment of PVC sponge leather cloth are practical application.
- 日本ゴム協会の論文