Multilayer insole

Abstract

The present invention relates to a multi-layer insole comprising a base mounted to the inside of a sole, a foam layer located above the base, and a fabric layer located above the foam layer. The substrate is made of hard bio-based polyurethane, the foam layer is made of foamed bio-based polyurethane, and the fabric layer is at least made of lyocell fibers or bio-based polyamide fibers.

Description

technical field [0001] The present invention relates to multilayer insoles, ie insoles made of layers of polymeric material, which can be inserted into a shoe, for example for hygienic and orthopedic purposes. Background technique [0002] Known rubber insole (invention patent CN 110240734 A, IPC C08L7 / 00, C08L 91 / 06, C08K 13 / 02, C08K 3 / 26, C08K 3 / 015, C08K 5 / 00, C08J 9 / 00, A43B 17 / 14, published on September 17, 2019), it can be seen that the following mass ratios are included in the foaming composition containing natural rubber (the foaming composition contains 91% to 94% of natural rubber and fatty acid, ash, protein and sugar mixture), also includes Chinese herbal medicine, nano calcium carbonate, calcined kaolin, talcum powder, naphthenic oil, zinc oxide, stearic acid, foaming agent, paraffin, antiwear agent, antiyellowing agent , accelerators and sulfur: [0003] Foaming composition containing natural rubber-100 [0004] Chinese herbal medicine-25 [0005] Nano calc...

AI Technical Summary

Problems solved by technology

[0025] Disadvantages of the closest analogues are low manufacturability, low environmental friendliness, high complexity required for its manufacture and long duration of the total operation, low absorption properties, high cost due to the combination of manufacturing known analogues caused by the composition of

[0026] Despite their remarkable antimicrobial properties, the closest analogues are characterized by low manufacturability, long duration of total operations required for manufacture, and high cost due to proper pretreatment of the algae that are part of it, obtained containing sulfuric acid Biomass of polysaccharides (in particular fucoidan), and components for the production of solid and foamed polyurethanes synthesized in a well-known manner from non-renewable raw materials (i.e. synthesis of isocyanates and polyols), algae The fusion of substances into layers made of polyurethane requires the design and use of complex equipment, many complex operations, and high costs for raw materials, time, labor and energy

[0027] The starting material used for the production of the above biomass is characterized by complex extraction processes in a limited number of areas, which also increases the cost of the original insole

[0028] Moreover, the extraction of petroleum and other raw materials from non-renewable resources to produce polyurethane as part of the closest analog harms the environment by polluting it, especially due to large carbon dioxide emissions, which indicates the environmental friendliness of the closest analog Low sex

[0029] In addition, the closest analogues have low absorption properties, because polyester fibers, polypropylene knitted fabrics and cotton fabrics absorb a small amount of moisture, which in turn leads to the proliferation of microorganisms, the accumulation of odors, the use of Odors and quick damage to fabric layers

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