Method for preparing solvent-free polyurethane resin adhesive and use thereof

Abstract

The invention discloses a method for preparing a solvent-free polyurethane resin adhesive and use thereof. The solvent-free polyurethane resin adhesive is obtained by reacting modified isocyanate prepared by ethers or ester polyols and ethers or ester polyols. The solvent-free polyurethane resin adhesive of the invention improves the dyeability by introducing a group which can be combined with a dye in the preparation process, and selects an appropriate ether polyol or a small molecule alcohol substance to enhance the effect of dye penetration; In addition, an organic solvent is not used in the preparation process, and the finished product has no solvent release and no solvent residue, and is environmentally friendly; compared with the solvent-based PU resin, the product has the advantagesof better dyeability, hydrolysis resistance, and the like.

Description

Technical field [0001] The invention relates to a method for preparing a solvent-free polyurethane resin adhesive and its use. Background technique [0002] Velcro tape is a fabric fastener, usually composed of a pair of components, including a hook and loop structure (loop / hook structure), one of which is covered with a loop structure and the other is covered with a hook Shape structure, when the two are pressed together, the loop and the hook are combined to form a temporarily fastened state; the two can be separated by applying external force in the appropriate direction and magnitude. Hook and loop fasteners are used in multiple ways and have high degrees of freedom, and are widely used in outdoor products and daily necessities. [0003] In order to make the surface of the component include loop and hook-like structures, a common way is to join these structures to the textile substrate respectively. Specifically, these structures can be joined to the textile substrate by coati...

AI Technical Summary

Problems solved by technology

Therefore, when it is desired to introduce dye molecules into the polyurethane resin, even if the dye molecules enter the polyurethane structure, they still cannot be firmly combined with the polyurethane main chain; on the contrary, most dye molecules can only be adsorbed on the polyurethane with weak chemical force. On the pores or on the surface, the content of dye molecules in the polyurethane molecule is very low, so there are defects such as difficult dyeing, poor colorability, poor level dyeing property, and poor color fastness.

In addition, the disadvantage of traditional solvent-based PU resin adhesives is that harmful solvents are used in the production and / or use process, which may cause harm to the environment, producers and users

Another disadvantage is that when using a solvent-based PU resin adhesive to bond the substrate and the structure, due to its limited hydrolysis resistance, there is still room for improvement in the long-term bonding firmness and stability.

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