Polyether polyurethane resin and preparation method thereof

Abstract

The invention relates to polyether type polyurethane resin and a preparation method thereof. The polyether type polyurethane resin is obtained by reacting a hydroxyl-terminated polyurethane prepolymer, diisocyanate and a chain extender in the presence of a solvent, the polyether type polyurethane resin comprises the following components in percentage by weight: 1.5-23% of a hydroxyl-terminated polyurethane prepolymer, 1-3% of an initiator, 1-3% of a curing agent and the balance of a solvent. 1%-12% of diisocyanate; 0.1%-2% of a chain extender; and the balance of a solvent. Or, the water-based paint also comprises the following components in percentage by weight: 1.5-20% of polyether polyol. The introduction of the hydroxyl-terminated polyurethane prepolymer effectively slows down the skin skinning speed of the full-polyether wet-process polyurethane resin, the skin skinning speed is uniform, the solidification speed is high, and the cell structure is of a vertical long structure, so that the prepared base is thin in skin and easy to absorb grains, and the prepared synthetic leather is good in grain absorption effect and clear in grains; the synthetic leather keeps good hand feeling after vacuum grain suction, and the peel strength attenuation is small. The base is prepared through a wet process, and the base is applied to the field of synthetic leather.

Description

technical field [0001] The invention relates to a polyether type polyurethane resin and a preparation method thereof, and also relates to a synthetic leather prepared from the polyurethane resin by a wet process. Background technique [0002] With the expansion of the application range of polyurethane synthetic leather, different application fields have put forward different performance requirements for synthetic leather. Among them, synthetic leather for clothing and shoe materials, due to long-term contact with sweat, moisture, etc., requires hydrolysis resistance of synthetic leather. higher. Conventional polyester synthetic leather has poor hydrolysis resistance. Therefore, in recent years, all polyether hydrolysis-resistant wet-process resins have been widely used in clothing, shoe leather, sofa and other fields. [0003] However, in the process of preparing synthetic leather substrate (bass) by wet process of polyether polyurethane resin, due to the uneven coagulation...

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Problems solved by technology

[0003] However, in the process of preparing synthetic leather substrate (bass) by using wet process for polyether polyurethane resin, due to the uneven solidification of polyether polyurethane, the skin of the prepared bass is too fast and the skin is thick.

Synthetic leather products usually need vacuum embossing process, which requires the base to have a thinner skin and a good supporting cell structure. However, the current polyether polyurethane resin is difficult to meet the above requirements. Therefore, all polyether polyurethane resins currently on the market Polyurethane wet-process resin has technical problems such as difficulty in vacuum absorption or unclear lines

In addition, although the hydrolysis resistance of polyether polyurethane resin is better than that of polyester type, the poor mechanical properties of polyether polyurethane resin are also one of the reasons that limit its application range.

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