Patent display(3)Polyurethane resin substrate for direct-coated waterproof and moisture-permeable clothing leather and preparation method thereof

Technical field

The present invention belongs to the technical field of chemical products and preparation methods thereof, in particular to a polyurethane resin substrate for waterproof and moisture-permeable clothing leather, and also relates to the preparation method and application of the polyurethane resin substrate.

Background

With the improvement of people's living standards, people's requirements for clothing fabrics are getting higher and higher, especially in rainy days, winter or outdoor sports, not only require the clothes worn to have waterproof and warm effects, but also require good breathability of clothing, so that the hot air with sweat stains inside the clothing with higher temperatures is discharged in time to avoid poor wearing comfort.

Direct-coated polyurethane waterproof and moisture-permeable clothing leather is a kind of fabric with good waterproofness and good air permeability, and the fabric adopts the direct coating of polyurethane using the fabric;Because the coating covers the fiber pores of the fabric, the raindrops will not pass through the fabric, so that the fabric has the function of waterproof and moisture permeable;At the same time, because the polyurethane coating components contain hydrophilic components, the sweat of the human body can be discharged in the form of steam, and the hydrophilic components in the polyurethane coating are transmitted to the outside in the form of adsorption - desorption - adsorption, so as to achieve the function of moisture permeability.

However, polyurethane waterproof and moisture-permeable clothing leather on the existing market generally has the defects of unsatisfactory humidity and hard hand feel;The clothing leather that improves the moisture permeability is washable and washable, the feel is too soft, and the adhesion fastness with the base cloth becomes worse.

Generally, the direct-coated polyurethane waterproof and moisture-permeable clothing leather includes fabrics and substrates, the fabric ensures a better feel on the surface of the clothing leather, and the substrate ensures the adhesion fastness between the resin and the fabric. The process of highly permeable fabric is simple, but the existing highly permeable substrate contains a large number of hydrophilic components, so there are shortcomings of large water expansion and poor washing resistance.

Contents of the Invention

Purpose of the Invention:Object of the present invention is to provide a water resistance good direct coating type waterproof and moisture permeable clothing leather polyurethane resin substrate and preparation method thereof.

Technical solutions:The present invention provides a direct-coated waterproof and moisture-permeable clothing leather polyurethane resin base, made of the following components by weight: isocyanate compound 5-15 parts;Dihydroxyhydrophilic polymer polyols 20-50 parts;Diphthong Hydroxyhydrophobic polymer polyols 10-20 parts;Bihydroxy small molecular weight polyols 1.5-5 parts;Organic solvent 30-70 parts.

As a preferred polyurethane resin substrate of the direct-coated waterproof and moisture-permeable clothing of the present invention, the isocyanate compound comprises an aliphatic isocyanate compound or an aromatic isocyanate compound;Among them, aliphatic isocyanate ester compounds include 1,6-hexanediisocyanate, benzenedimethyl diisocyanate and isophorone diisocyanate, etc;Aromatic diisocyanate compounds include toluene diisocyanate and 4,4'- diphenylmethane diisocyanate in one or both;Most preferably, the aromatic isocyanate compound comprises a weight percentage of 20-80% toluene diisocyanate and 20-80% of 4,4 '- diphenylmethane diisocyanate.

As another preferred polyurethane resin substrate of the direct-coated waterproof and moisture-permeable clothing leather of the present invention, the dihydroxyphilic polymer polyol is a polyethylene glycol, the molecular weight of which is 1000-6000.

As another preferred polyurethane resin substrate of the direct-coated waterproof and moisture-permeable clothing leather of the present invention, the bihydroxyhydrophobic polymer polyol comprises a percentage by weight of 10-90% polyester polyols and 10-90% polyether polyols.

As another preferred polyurethane resin substrate for direct-coated waterproof and permeable clothing leather of the present invention, the Polyester Polyol comprises polyethylene glycol butylene glycol hexanediol adipic acid, which has a molecular weight of 1000-6000, made of ethylene glycol, butylene glycol, hexanediol and adipic acid, preferably, by weight of 20-60 parts of ethylene glycol, 10-40 parts of butanediol, 20-50 parts of hexanediol and 3-70 parts of adipic acid;The preparation method is: ethylene glycol, butylene glycol, hexanediol and adipic acid at 100-170 °C dehydration reaction, heated to 180-200 °C transesterification reaction, in the hydroxyl value of 20-112, water < 0.03%, acid value of 0.1-0.8mg KOH / g, stop the reaction, that is, to obtain.

As another preferred polyurethane resin substrate for direct-coated waterproof and moisture-permeable clothing leather of the present invention, the polyether polyol comprises one or both polytetrahydrofuran diols and polyoxypropylene diols; More preferably, the polyether polyol comprises a percentage by weight of 20% -80% polytetrahydrofuran diol and 20% - 80% polyoxy propylene diol, which has a molecular weight of 1000-6000.

As another preferred polyurethane resin substrate of the direct-coated waterproof and moisture-permeable clothing of the present invention, the bihydroxy small molecular weight polyol comprising one or more of ethylene glycol, neopentyl glycol and diethylene glycol; More preferably, the dihydroxy small molecular weight polyol comprises a percentage by weight of 40-80% ethylene glycol, 10% -50% neopentyl glycol and 10% - 50% diethylene glycol.

As another preferred polyurethane resin substrate for direct-coated waterproof and moisture-permeable clothing leather of the present invention, the organic solvent comprises one or more dimethylformamide, toluene and butanone; More preferably, the organic solvent comprises a percentage by weight ratio of 30% -70% dimethylformamide, 20% - 60% toluene and 10% - 50% butanone.

The present invention further provides a method for preparing the above-described direct-coated waterproof and moisture-permeable clothing leather polyurethane resin substrate, comprising the following steps: aliphatic or aromatic isocyanate compounds, dihydroxyhydrophilic polymer polyols, bihydroxyhydrophobic polymer polyols, dihydroxy small molecular weight polyols dissolved in an organic solvent, reacted to a viscosity of 18-20cps/ 25 ° C at 60-70 ° C, cooled to obtain.

Beneficial effect::The preparation method of polyurethane resin substrate for waterproof and moisture-permeable clothing leather provided by the present invention is simple, low cost, high moisture permeability, soft feel, good adhesion fastness with the base cloth, high water pressure resistance, good wash resistance.