CS259300B1 - Method of manufacturing underlays by foaming segmented polyurethane microcells to rubber vulcanization - Google Patents

Abstract

The solution concerns the footwear industry. It solves the foaming of segmented polyurethanes of microcellular structure on rubber soles. It also solves the method of chemical treatment of rubber vulcanizate, creation of a polar surface on the sole bed and a layer of one-component non-crystalline type thermoplastic polyurethane before the foaming of segmented polyurethanes. In addition to footwear, the solution can be applied in the rubber and plastics industries.

Description

259300

The present invention is solved by a method of foam-agglomerating polyurethanes to rubber waxes. A particular solution for the production of underlays in a combination of rubber vulcanizate -. isegmentated polyurethane micro; bU3a © & aej Strengthening, by direct foaming to the shoe upper.

A recent advancement in the production technology is presented by direct injection molding of polyurethane to form a two-color polyurethane outsole.

Technically, this manufacturing method is solved by first producing a tread portion of a sole of polyol and isocyanate component. The mold cover is replaced by the upper and the polyurethane is injected into the space between the upper and the upper. The tread portion of the polyurethane sole is to have a high abrasion resistance, the tuft has to be flexible, low specific gravity and good thermal insulating properties.

Polyurethane, although having excellent abrasion resistance, is not the ideal material for sports-walking shoes and indoor sports, especially for the low trenla coefficient.

For these categories of footwear, a 'sports footwear in a rubber sole - polyurethane midsole' has been developed.

Technically satato footwear is produced eg by the Czechoslovak Army. The advantage of this technology is that the high-yield direct foaming technology allows a rubber sole to be bonded to the top in one operation. The basic method of making footwear for the sports of the sun makes it possible to apply practically any non-slip tread pattern.

However, its disadvantages include the use of two-component crystalline polyurethane adhesives. These are formed on the bed of rubber outsole to form a surface-coated coating. Before pouring the reacting polyurethane mass, their surface needs to be thermally activated. Without heating the surface of the binder, the crystalline bonds do not break, and consequently there is no good bonding of the vulcanizate with the polyurethane mass. After application of the adhesive, it is necessary to process it within 6 hours. After this time, the thermal activation of the coating does not provide a good bond as the two-component adhesive is already reacted. The adhesive itself, after mixing with the crosslinker, needs to be processed within 2 hours.

This technical problem is solved by the process of foaming the microcell segmented polyurethanes to the rubber vulcanizate by chemically treating the vulcanization surface with a 0.1 to 5% / trichloroisocyanuric acid solution prior to pouring the reacting polyurethane mass. in an organic solvent followed by application of a 0.5 to 30 percent polyurethane solution having a molecular weight of 30,000-9,000. :

It is to be understood that the progress of the present invention is that very productive technology allows the rubber vulcanizate to be combined with the polyurethane in the form of a single operation, using a single-component polyurethane-based adhesive. The properties of polyurethanes are dependent on the number of urethane groups that carry the physical-mechanical properties. Polyurethanes are generally prepared from diisocyanates, polyesters, or polyethers and low molecular weight diols. The aliphatic diisocyanyl-4-fluoro-methylenediisocyanate provides a yellowing, hydrolysis, and thermal degradation product thereof.

By using a third monomer in the preparation of the polyester polyols, the regularity of the glycol chain structure is impaired, resulting in a lower freezing point. This property is then also transferred to the resulting polyurethanes, which have a better resistance to low temperatures and an irregularity to give rise to amorphous non-crystalline polyurethane grades. And it is precisely polyurethanes prepared from such co-alloys that are suitable for the surface treatment of rubber vulcanizates for the directing of polyurethane regulating fillers.

This polymer, providing excellent bond strength, does not require thermal activation prior to polyurethane infusion.

More detailed methods of making the present invention are illustrated by the following examples.

Example-í ·· - · -.....: ··· /. '·; · ··; In the presence of a gamma-like solution, the solution is then quenched with thiuric acid solution, the trichloroisocyanuric acid in an aqueous solution having expired for 30 minutes. is treated with a 10% solution of a thermoplastic polyurethane having a molecular weight of about 40,000 abol prepared from hexamethylene diisocyanate, polyphenylene butylene adipate glycol of molecular weight of 2,000 and butanediol.

The thus-treated soles are placed on the back of the mold. Before the mold is closed, a vulcanizate mixture of isocyanate component prepared by reacting 4,4'-diphenyl methanediisocyanate and a polyester polyol containing 17 / / o of free NCO groups is poured onto the vulcanizate. from polyester polyol, monoethylene glycol, water and catalysts. Both components are mixed in a ratio corresponding to the basic stoichiometry between NCO and -OH groups. The reactive polyurethane plug is chemically bonded to the treated rubber sole to form a sole,

Claims (1)

259300 5 The tread part is made of rubber and the midsole of flexible polyurethane. This method of production can also advantageously be used in the direct foaming of polyurethanes to form a shoe shoe. At that time, the mold is not closed by the lid but formed by the upper, which is taut toe. SUBJECT OF THE PROCESS FOR MANUFACTURING SUBSTANCES OF TREATED-SEPARATED POLYURETHANES OF THE MICROCELLIC STRUCTURE TO A RUBBER VULCANATE EXPRESSED IN WHICH THE VULCANATE SURFACE IS PREPARED BY PRIORING THE REACTING POLYURETHANE WITH A 0.1 TO 5% Trichloroisocyanuric Acid Solution Into The Organic Solvent In The Organic Solvent followed by 0.5. up to 30% polyurethane solution having a molecular weight of 35,000 to 50,000, prepared from hexamethylenediisocyanate, poles (ethylene-butylene adipate glycol and a low molecular weight diol).