CS252015B1 - Shoe material for the manufacture of underwear - Google Patents

Abstract

Footwear material for the production of transparent lower parts, in particular soles, consisting of synthetic and/or natural elastomer and/or thermoelastoplast, activator, accelerator, vulcanizing agent, retarder, resin, plasticizer, antioxidant, blowing agent, wax and inorganic filler, containing, based on the total weight of the mixture, 8 to 40% of silicon dioxide with a particle size below 60 µm, a specific surface area of 120 to 300 m2/g, a bulk density of 0.22 to 0.35 g/cm3 and a pore volume of 1.2 to 2.1 cm3//g, prepared by mixing 30 to 50% by volume of an acidic sol of silicic acid into a sodium or potassium silicate solution with a concentration of 30 to 300 g of silicon dioxide per 1 l of silicate solution for 20 to 60 minutes, adding the remaining volume of the acidic silicic acid sol over 30 to 80 minutes and neutralizing the solution to a pH of 5 to 4.

Description

252015

BACKGROUND OF THE INVENTION The present invention relates to a footwear material for the manufacture of sub-components, in particular to the sole. Nowadays, a wide range of rubber compounds for the production of all-rubber footwear is used in the footwear production, such as for the manufacture of underbody parts. These materials require some physical-mechanical properties. In order to achieve these properties, the components for the production of sub-components are treated by the addition of inorganic fillers. Shoe materials containing elastomers, chemical chemicals and white silicas are known. By adding white siliceous fillers the transparency with the permeability reaches 40 to 50%. However, this property is dependent on the process of preparing the white silica filler. The use of fillers, which adds a higher stiffening effect and improved physical-mechanical properties of rubber compounds, is common. The disadvantage of said fillers is the achievement of the desired significant material trans-parity. These are not capable of transmitting light without breakage, those caused by particle size and, in particular, by forming agglomerates in mixtures with natural and synthetic elastomers or rubbers. Agglomerates also exacerbate other physico-mechanical properties, such as strength and ductility, in addition to trans-parency.

The above-mentioned disadvantages are eliminated by the shoe according to the invention, which consists in containing, based on the total amount of the mixture, from 8 to 40% by weight of silicon hydroxide with a particle size below 60 µm, a specific surface area of 120 to 300 m 2 / g, a bulk density of 0.22 to 0.35 g / cm 3 and a pore volume of 1.2 to 2.1 cm 3 / g, prepared by mixing 30 to 50% by volume of acidic acid in a solution of sodium or potassium silicate having a concentration of 30 to 300 grams of silica per 1 L of silicate solution for 20 to 60 minutes, adding residual acid sol volume for 30 to 80 minutes and neutralizing the solution to a pH of 5 to 4.

The technical effect of the invention is that the addition of filler in said quantity does not produce agglomerates in the mixture of synthetic and natural elastomers or rubbers, since the filler has a uniform structure. This greatly increases the transparency of the footwear material while achieving a stiffening effect. The shoe material has good strength and ductility and increased abrasion resistance.

The shoe material of the invention is illustrated in more detail by the following examples. All amounts of ingredients are given in percentages by weight. Example 1 A mixture is prepared in a kneader by successive dosing and homogenisation of the following components: butadiene-styrene elastomer, 56.95% silicon dioxide 34.1% active zinc oxide 2.85% triethanolamine 2.3% stearin III 1.7 ° / o N-cyclohexyl-2-benztriazole sulfenamide 0.2% diphenylguanidine 0.2% sulfur 1.6%

Silica was prepared by mixing 43% by volume of acidic silica sol in a sodium silicate solution of 300 g of silica per liter of solution at 60 ° C for 52 minutes. In addition, the remaining acid sol was added and after 52 minutes of ripening, the solution was neutralized with sulfuric acid to pH 5. Silicon Hydrooxide as a filler, particle size below 50 μΐη, surface area 136 m 2 / g, bulk density 0.26 kg / kg. cm 3 and a pore volume of 1.6 cm 3 / g. The prepared mixture was vulcanized with a 60 ° / o light transmittance and the following physico-mechanical properties: tensile strength 14 mPa elongation 600% hardness 64 ShA modulus 300 3.1 MPa Example 2 Prepared by mixing the following components on a double cylinder: zhomoge-natural rubber 14 , 80% butadiene-styrene rubber 42.15% silicon dioxide 28.46% active zinc oxide 1.62% triethanolamine 0.49% benzoic acid 0.28% 2-mercaptobenzotriazole 0.84% diphenylguanidine 0.77 O / bis bis (2-benztriazyl disulphide 0.35% rosin 1.05 o / o 2-mercaptobenzimidazole 0.42 o / o sulfur 1.05 o / o oil 7.2% o stearin III 0.7 0.7 / o

Silica hydride was prepared by mixing 30% by volume of acidic silicic acid sol in a solution of potassium silicate at a concentration of 136 g of silica per liter of solution, at 95 ° C for 22 minutes. Further, the residual residual sol was added and after 45 minutes of maturation, the solution was neutralized with hydrochloric acid to pH 4. The silica silicon dioxide, as a filler, had a particle size of less than 60 .mu.m, a specific surface area of 190 m @ 2 / g, bulk density. 0.32 g / cm 3 and a pore volume of 1.2 cm 3 / g.

Claims (1)

252015 The prepared mixture after processing on the double cylinder formed a shoe material with a light transmittance of 70% and the following physical-mechanical properties: tensile strength 7.5 MPa elongation 600.0% hardness 63 ShA module 300% 3.2 MPa Example 3 A blend is prepared by homogenizing the following components: styrene-butadiene-styrene block copolymer 72.74 ° / o polystyrene 11.56% ethylene-vinyl acetate copolymer 3.3% silicon dioxide 8.25% active zinc oxide 0, 33% indene-coumarone resin 0.40% 2-mercaptobenzimidazole 0.77% wax 0.11% stearin III. 0.11 ° / o oil 2.11% azodicarbonate 0.17% lauryl thiodipropionate 0.15% Silicon dioxide was prepared by mixing 50% by volume of acidic silicic acid sol into a sodium silicate solution at a concentration of 43 g of silica per liter of solution at 90 ° C. ° C for 22 minutes. The remaining portion of the sol was added and the ripening time was 72 minutes. The solution was neutralized with sulfuric acid to a pH of 5. The siloxane, as a filler, had a particle size below 40 .mu.m, a surface area of 268 .mu.g / g, a bulk density of 0.22 cm @ -1. and a volume of 2.1 cm 3 / g. A mixture was prepared which was processed by vulcanization into a shoe material, transparent, with a light transmittance of 70 pairs. and the following physico-mechanical properties: tensile strength 7.5 MPa elongation 600% hardness 63 ShA modulus 300 ° / 3.2 MPa OBJECT OF THE INVENTION Footwear material for the manufacture of underwear comprising a mixture comprising 25 to 71% by weight of synthetic elastomer a tomer and / or a natural elastomer and / or thermo-plastics, 2.5 to 4% activator, 0.6 to 1.7% accelerator, 0.9 to 1.5 pairs. a curing agent, 0.4 to 0.7% retarder, 0.5 to 6.3% resin, 7 to 12% plasticizer, 0.2 to 0.8% antioxidant, 0.15 to 8.2% blowing agent, and 0, 23 to 0.8% wax, characterized in that it comprises, based on the total amount of the mixture, from 8 to 40% by weight of silica with a particle size below 60 µm, a specific surface area of from 120 to 300 m 2 / g, a bulk density of from 0.22 to 0.35 g / cm 3 and a pore volume of 1.2 to 2.1 cm 3 / g, which can be prepared by mixing 30 to 50% by volume of the acidic silicic acid salt of a solution of sodium or potassium silicate at a concentration of 30 to 300 g of silica per 1 of the silicate solution in the form of 20 to 60 minutes, by adding the remaining volume of the acidic silicic acid salt for 30 to 80 minutes and neutralizing the solution to a pH of 5 to 4.