Hydrolysis-resistant PU synthetic leather and production method thereof

Abstract

The invention relates to the technical field of PU synthetic leather, in particular to hydrolysis-resistant PU synthetic leather and a production method thereof. The hydrolysis-resistant PU syntheticleather is prepared from, by weight, 40-55 parts of isocyanate, 40-45 parts of glycol ester diol, 30-45 parts of dimethylformamide, 25-35 parts of ethylene glycol, 12-17 parts of a cross-linking agent, 5-9 parts of an antioxidant, 3-4 parts of an organic bismuth catalyst and a spring steel sheet; the hydrolysis resistance of the PU material is poor, and an unbalanced acting force is applied to thesole due to an improper walking posture in the wearing process of the shoe, so that the aging damage of the PU synthetic leather material is accelerated. By means of the spring steel sheet arranged in the PU synthetic leather material of the sole, when the wearer walks in a non-standard posture, a larger force is brought to one side of the PU synthetic leather material of the sole, the other sideof the sole protrudes through the spring steel sheet, a wearer is reminded with the larger force to change the foot force exerting state of the wearer, unbalanced stress borne by the PU synthetic leather material of the sole is avoided, and the application effect of the hydrolysis-resistant PU synthetic leather is improved.

Description

technical field [0001] The invention relates to the technical field of PU synthetic leather, in particular to a hydrolysis-resistant PU synthetic leather and a production method thereof. Background technique [0002] Polyurethane (PU) has excellent mechanical properties and wear resistance and folding resistance, and is used in the synthetic leather industry, and has gradually replaced natural leather. It is widely used in the decoration of bags, clothing, shoes, vehicles and furniture. Polyurethane can be divided into There are two types of ether type and polyester type. Among them, polyether type polyurethane has excellent hydrolysis resistance, but its low polarity makes the adhesion on the cloth base insufficient, and polyester type polyurethane has better oil resistance. Solvent and bonding performance, but its hydrolysis resistance is poor; while PU synthetic leather is more vulnerable to damage under the combined action of external force, humid environment and high te...

AI Technical Summary

Problems solved by technology

[0002] Polyurethane (PU) has excellent mechanical properties and wear resistance and folding resistance, and is used in the synthetic leather industry, and has gradually replaced natural leather. It is widely used in the decoration of bags, clothing, shoes, vehicles and furniture. Polyurethane can be divided into There are two types of ether type and polyester type. Among them, polyether type polyurethane has excellent hydrolysis resistance, but its low polarity makes the adhesion on the cloth base insufficient, and polyester type polyurethane has better oil resistance. Solvent and bonding properties, but its hydrolysis resistance is poor; while PU synthetic leather is more vulnerable to damage under the combined effects of external force, humid environment and high temperature under light irradiation

[0003] At present, in footwear products made of PU materials, the polyester PU synthetic leather used has poor hydrolysis resistance, and it is necessary to add additives and control the production process, which increases the difficulty of producing PU synthetic leather; During the wearing process, improper walking posture will cause unbalanced force distribution on the sole, which in turn accelerates the aging and damage of PU synthetic leather materials, and weakens the application effect of PU synthetic leather in shoes.

[0004] In the prior art, there are also some technical solutions about hydrolysis-resistant PU synthetic leather and its production method. For example, a Chinese patent with application number 2020103785358 discloses a hydrolysis-resistant PU synthetic leather and its production method; Cloth layer and PU surface layer; PU surface layer is made from the following raw materials by weight: polyether type polyurethane resin: 70 parts; glass fiber: 10 parts; microcrystalline cellulose particles: 15 parts; anionic surfactant: 1 part; nonionic surfactant: 2 parts; solvent (DMF): 31 parts; the method comprises the following steps: S1: PU slurry mixing; S2: slurry coating; S3: coagulation measurement; S4: washing and drying ;S5: Winding, embossing, grinding; This technical solution adds glass fiber to the polyether polyurethane resin, which can improve the water absorption and hydrolysis resistance of the polyurethane resin. After adding microcrystalline cellulose, these filler particles can be partially Filling in the latitude and longitude holes and depressions of the base fabric smoothes the unevenness caused by the texture defects of the base fabric, thereby improving the smoothness and stability of the combination between the PU surface layer and the base fabric layer, and improving the quality of PU synthetic leather But in this technical scheme, in the shoes that PU synthetic leather is not solved, its sole is under the non-standard walking posture of the wearer, exerts unbalanced active force to the PU synthetic leather in the sole, affects the PU synthetic leather. Hydrolysis resistance

Images