Double-hardness insole and preparation method thereof

Abstract

The invention discloses a double-hardness insole which comprises a foot bed layer and a bottom layer, the foot bed layer is mainly prepared from a thermoplastic elastomer selected from 4500N-FM or 4001-45N, EVA, a medium temperature foaming agent, zinc oxide, a filler, a bridging agent, a bridging auxiliary agent, a lubricant, an antioxidant, IB-50, titanium dioxide and color master batch, the Shore hardness is 22-28, te bottom layer is mainly prepared from E182F, EVA, a medium-temperature foaming agent, zinc oxide, filler, a bridging agent, a lubricant, a dispersing agent, titanium dioxide and color master batches, and the shore hardness is 49-55. According to the double-hardness insole provided by the invention, the overall durability and the shock-proof effect of the insole are kept, and meanwhile, the wearing comfort of the shoe provided with the insole is remarkably improved. The invention further provides a method for preparing the mold pressing insole with the double hardness by combining single-time foaming with the mold pressing process, and the double-hardness insole produced through the preparation method is high in production efficiency and stable in product quality.

Description

technical field [0001] The invention belongs to the technical field of shoe material processing, and in particular relates to a double-hardness insole and a preparation method thereof. Background technique [0002] The insole is an important part of the shoe. When in use, it is placed inside the shoe, between the sole of the human foot and the sole, to avoid direct contact between the sole of the human foot and the hard sole. As a part of the shoe that is in direct contact with the sole of the human foot, the insole needs to have a certain degree of elasticity and support. Currently common materials for making insoles include polyurethane (PU), thermoplastic polyurethane elastomer rubber (TPU), and ethylene-vinyl acetate copolymer (Ethylene Vinyl Acetate copolymer, EVA) and the like. The insoles made of these materials have certain elasticity, but either have good supporting properties, but are relatively rigid and hard, such as insoles made of PU, which have good elasticit...

AI Technical Summary

Problems solved by technology

The insoles made of these materials have certain elasticity, but either have good supporting properties, but are relatively rigid and hard. For example, insoles made of PU have good elasticity and support, but due to the high density of PU, The prepared PU insole has a large weight and strong rigidity; or the hardness is small and the resilience performance is good, but the supporting performance is insufficient and the durability is reduced. For example, the insole made of TPU, although the insole made of TPU is less dense, Light weight, good elasticity and resilience, but low hardness and insufficient support capacity

In addition, due to the large difference in hardness between the insole and the skin on the sole of the human foot, people wearing shoes with this insole will easily feel discomfort on the sole of the foot when they directly contact the insole, and the comfort of the shoe will be greatly reduced. After a long time, the feet are prone to fatigue and damage

[0003] still lacks an insole that can take into account wearing comfort and durability in the prior art

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