Wet type polyurethane resin, production process and application method thereof

Abstract

The invention provides a wet type polyurethane resin, a production process and an application method thereof. The production process mainly comprises the following steps: 1, carrying out a soft-segment synthetic reaction on macromolecule dihydric alcohol and diphenyl methane diisocyanate; 2, enabling a first prepolymer to react; 3, adding a chain extender, and carrying out hard-segment synthetic reaction; and 4, adding an auxiliary. The wet type polyurethane resin manufactured by the production process is in form of yellowish transparent and thick viscous fluid, has viscosity of 180,000 to 220,000 (cps / 25 DEG C), modulus of 100% under 4.5 to 5.5 Mpa, elongation of not less than 550% and strippability of not less than 12.0kg / 3cm, the hydrolysis resistance is that 10% of NaOH is hydrated for 24 hours, and the wet type polyurethane resin has texture formation of 50 to 65%. The production process has the advantages that the texture formation, peeling strength and hydrolysis resistance of the wet type polyurethane resin are improved; the auxiliaries are selected before forming the leather, so that the density of the wet type polyurethane resin is improved, the finished artificial leather has washing durability and is high in strippability and full in touch.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a wet-process polyurethane resin and its production process and use method. Background technique [0002] At present, artificial leather is made by traditional technology, and the polyurethane resin produced by traditional technology is used to process the leather to obtain high peelability, good myogenicity and good hydrolysis resistance. [0003] The size of the leather cells is related to the viscosity of the prepolymer in the previous stage. The soft segment and the hard segment in the traditional process are a combined reaction. Various factors are not easy to control. The leather cells produced are small and poor in regularity, resulting in poor leather muscle formation. , the peel strength is not high. It is necessary to increase the number of scrapers and increase the amount of slurry used to achieve the relevant myogenicity, which increases the cost to a certain extent....

AI Technical Summary

Problems solved by technology

However, the polyether soft segment with low polarity is relatively poor in terms of structural regularity and strength.

Moreover, most polyether polyols contain side chains, which can produce steric hindrance effects, weaken the hydrogen bonds between PU molecular structures, and deteriorate crystallinity, which have a direct impact on the peel strength and tensile strength of the product.

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