CZ278369B6 - Material for producing a skeleton self-supporting sole part including the heel - Google Patents

Abstract

The polyurethane material from which the sole part is made contains, as a reagent, an elongating polyurethane chain of 7 to 8 weight parts of monoethylene glycol or 9.5 to 10.5 weight parts 1,4-butandiole, in both cases in relation to the total weight of the polyurethane material of the sole part.

Description

The invention provides a material for manufacturing a skeleton self-supporting shoe sole including a heel, with a specific weight of 0.5 to 0.75 g / cm ^{3 and} a Shore A hardness of 88 to 92 degrees, made of crosslinked polyurethane foam with a compact top layer in which diol the polyurethane chain extender component is represented by monoethylene glycol or 1,4-butanediol.

Among the types of footwear used, especially women's footwear, the lightweight design of the skeletal sole part with heel to which it is attached by means of mechanical fastening elements of the upper has repeatedly kept its popularity. The popularity of this footwear is mainly due to the fact that it is an analogy of comfortable clogs, which is adapted to the external appearance of the footwear, although the sole skeleton has long been pressed from plastics.

The outsole skeletons of expanded polyolefins are difficult to color or lacquer. Polyurethane sole skeleton causes difficulties in holding the upper due to the relatively low values of tear resistance of the fasteners (CS 197 113, US 3 925 915). This problem is quite arduous and has not yet been satisfactorily. The solution (DE 2521146), according to which wooden blocks are pressed into the outsole skeleton on the circumference of the sole, is shown. The fasteners hold them perfectly, but the sole of the outsole skeleton is pulled out while walking the whole block.

These and other disadvantages of the prior art have been successfully solved by the skeletal design of a self-supporting shoe sole including a heel with a specific weight of 0.5 to 0.75 g / cm ³ and a Shore hardness of 88 to 92 degrees, provided at least on a tread heel pad. The skeleton of the self-supporting sole is connected to the upper of the shoe by means of metal fasteners such as nails or screws or screws. It is made of crosslinked polyurethane foam with a compact top layer in which the diol component of the polyurethane chain extender is represented by monoethylene glycol or 1,4-butanediol and comprises 7 to 8 parts by weight of monoethylene glycol or 9.5 to 10, 5 parts by weight of 1,4-butanediol, in both cases based on the total weight of the polyurethane material of the sole part.

The advantage of a skeleton self-supporting shoe sole including a heel made of the material according to the invention is its higher hardness, stiffness and in particular a greater thickness of the upper compact layer, which results in good cohesion of the uppers fastened to the polyurethane skeleton by mechanical means, e.g.

The skeleton material of the self-supporting sole sole including the heel of the invention has excellent abrasion resistance properties, which allows the tread plate to be pressed directly as part of the skeleton and thus eliminates subsequent sticking, mostly from a different material. Due to the Shore A hardness range of 88 to 92 degrees, the skeleton is self-supporting even without the use of reinforcing elements of metal or plastic, so that in its crown portion there is no desirable deflection that would

B6 adversely affected gait physiology.

The vast majority of imported benefits are due to the increased proportion of the diol component in the skeletal sole material of the shoe including the heel of the invention, as compared to a technically steady state, so that foaming of the polyurethane mass is confined to the inner core and the outer shell is more compact.

The following table illustrates the increased cohesiveness of the fasteners of the skeleton self-supporting shoe sole including the heel of the material of the invention (last row) compared to polyurethane materials of different Shore A hardness, at the same bulk density, expressed as a pull-out resistance in N.

Coupling type means Grooved nail Screw special Screw 3X16 ČSN 02 1817 Screw 2,5x16 ČSN 02 1817 3X16 wood screw CSN 02 1817 Abrasion mg Volume, mass Hardness of PUR mixture Shore A 70 55 81 85 30 75 65 0.6 79 62 90 105 98 83 70 0.6 86 66 120 192 170 115 60 0.6 90 70 150 220 210 165 85 0,5 to 0.7

The positive effect of the increased content of 1,4-butanediol or monoethylene glycol in the polyurethane mixture of the skeleton self-supporting sole sole including the heel according to the invention is illustrated by the following discussion and tables of selected critical physico-mechanical values.

According to the prior art, for the amount of low molecular weight diol, the effect of the PUR integral foams on the sole of the footwear for 1,4 butanediol is in the range of 6-7%, for monoethylene glycol

4.5 to 5.5% based on the total amount of the recipe.

The table shows the mechanical-physical properties depending on the content.

Glycols Quantity (wt%) Tensile strength (MPa Ductility (%) Structure strength (N / mm) Grinding (mm ³⁾ Hardness (ShA) Value (kg / m ³⁾ 1.4 6 4,5 495 19.4 25 63 0.62 butane- 6.5 5.4 495 19.8 20 May 68 0.63 diol 7 6.1 475 22.5 30 71 0.61 mono- 4,5 5.1 540 19.3 40 63 0.64 ethylene 5 5.4 510 19.8 45 67 0.63 glycol 5.5 5.7 490 20.1 45 71 0.62

-2—

With regard to the equivalent weights of the polyols, it is clear that the glycols have a relatively low equivalent weight as compared to the polyester, more than 20 times for 1,4 butanediol and more than 30 times for monoethylene glycol. As a result, changing the small amount of glycol will cause changes in the physical and chemical characteristics of the integral polyester-urethane foam.

An increase in the percentage of glycol component in the material of the invention by more than 40%, based on the amount of glycol, indicates a range of properties characteristic of the skeletal design of the self-supporting sole sole, including the heel.

Glycols Quantity (wt%) Strength in turn (MPa) Ductility (%) Structure strength (N / mm) Grinding (mm ³ ) Hardness (ShA) Density (kg / m ³⁾ 1.4 9.5 7.2 275 29.2 50 86 0.64 butanediol 10 7.5 300 30.1 50 89 0.65 10.5 7.4 300 30.5 52 91 0.65 mono- 7 6.1 275 26.2 65 85 0.65 ethylene glycol 7.5 6.5 275 27.6 70 90 0.65 8 6.3 275 27.9 72 92 0.65

The skeleton design of the self-supporting sole sole including heel made of the material of the invention will be briefly described hereinafter with reference to the accompanying drawing, which is a side view with a partial section in the toe section.

The article comprises a sole part 1 and a heel part 2, wherein in the embodiment according to the attached drawing, the tread plate 2 is located only on the lower sole part 1; with a skeletal design of the self-supporting sole sole including heel, the tread plate 2 is a monolith, made of the same material as cross-linked polyurethane, in which the diol component of the chain extender is monoethylene glycol or 1-butanediol. The material has an upper compact layer 4 and an inner foam core 5. The upper compact layer 4 of polyurethane has a tear resistance of the fasteners, not shown, ranging from 70 to 220 N. The polyurethane material whose composition will be given below has a specific gravity of 0.5 up to 0.75 g / cm ³ and a Shore A hardness of 88 to 92 degrees.

The material composition of the skeleton self-supporting shoe sole including the heel of the invention can be characterized as follows. It is a polyurethane shoe part with a specific weight of 0.45 to 0.75 and a hardness of 85 to 92 ° ShA. A semi-rigid polyurethane of this type is a reaction product of a polyol component consisting of a linear polyester having a molecular weight of 2000 to 4000 and a slightly branched polyester having a molecular weight of 2000 to 4000.

-3GB 2.78369 B6

3500, extension chains (glycols such as monoethylene glycol or 1,4 butanediol), foaming agents, a tertiary amine catalyst, a foaming regulator and an isocyanate component consisting of a linear polyester of adipic acid with diol and diphenylmethane-4,4 'diisocyanate containing free -NCO groups. Both components are in equivalent amounts. The proportion of monoethylene glycol is 7 to 8 parts by weight and the proportion of 1,4-butanediol is 9.5 to 9 parts by weight

10.5 parts by weight, based on the total weight of the polyurethane material.

A shoe upper (not shown) is fastened to the reinforced compact layer 4 of the skeleton self-supporting shoe sole including the heel. As is apparent from the foregoing description and from the pull-out table, the holding of the fasteners in the article is much higher than that of the prior art.

The self-supporting skeleton sole part of the shoe, including the heel of the invention, is produced by the process described by the accompanying examples.

Example 1

Polyurethane sole skeletons were molded from the polyurethane mixture in a heated mold. The specific gravity of the material is 0.7 g / cm ³ and the hardness is 92 ° ShA. In terms of material composition, the skeleton was the reaction product of an equivalent amount of component A composed of parts by weight of ethylene butylene adipate by mol. weight · 2000

19.6 parts by weight of monoethylene glycol (8%)

0.21 parts by weight of water

0.5 parts by weight of butylenediamine

0.7 parts by weight of a silicone-based foam regulator

Component A was equivalent to the amount of component B; a prepolymer prepared from ethylene butylene adipate and 4,4-diphenylmethane diisocyanate; content of free groups -NCO groups = 19%.

Example 2

145 parts by weight of component B of the prepolymer containing 19% -NCO free groups were mixed with 100 parts by weight of a polyol blend having the following composition

81.7 parts by weight of ethylbutylene adipate, molecular weight 2000

17.9 parts by weight (7.7%)

0.2 parts by weight of water

0.5 parts by weight of triethylenediamine

0.7 parts by weight of petroleum jelly

Skeletons of the following mechanical physical properties were obtained by reacting each other in the mold. Specific gravity 0.65 and hardness 90 ° ShA.

-4GB 278369 B6 i

Example 3

Prepolymer prepared from diphenylmethane diisocyanate and polyester polyol prepared from adipic acid and a mixture of monoethylene glycol from diethylene glycol. An average molecular weight of 2000, containing 19% free -NCO groups, is mixed with a polyol component of the following composition.

parts by weight 26.64 parts by weight 0.2 parts by weight 0.6 parts by weight 0.8 parts by weight of diethylene adipates of mol. Of 1,4-butanediol (10.7% water of triethylenediamine petrolatum oil weight 2000)

By reacting said components, the following mechanical-physical 91 ° ShA and a specific gravity of 0.65.

obtains polyurethane foam properties - hardness

P A T E N T,. O YE CLAIMS

Claims (1)

Material for the manufacture of a skeleton self-supporting sole with footwear, including heel, with a specific gravity of 0,5 to 0,75 g / cm and a Shore A hardness of 88 to 92 degrees, made of reticulated polyurethane foam with a compact top layer in which the diol component The polyurethane chain extender is represented by monoethylene glycol or 1,4-butanediol, characterized in that it contains 7 to 8 parts by weight of monoethylene glycol or 9.5 to 10.5 parts by weight of 1,4-butanediol in both cases based on the total weight of the polyurethane material of the sole part. .