Positive ion polyacrylate leather finishing agent and preparation method thereof

Abstract

The invention provides a positive ion polyacrylate leather finishing agent and a preparation method thereof. The positive ion polyacrylate leather finishing agent comprises 16-33 wt% of polyacrylate, 0.5-3 wt% of emulsifier and 65-83 wt% of water, wherein the polyacrylate is obtained by that a positive ion functional monomer and an acrylate monomer are subjected to polymerization reaction under the effect of an initiator and a cross-linking agent; and the positive ion functional monomer is one or more of dimethylaminoethyl methacrylate, methacrylate trimethylammonium chloride and trimethyl ammonium chloride n-methyl acrylamide. The positive ion polyacrylate leather finishing agent provided by the invention is mainly used for coating a leather bottom layer, and can be used for improving the appearance and the grade of finished leather. The finished leather is natural and soft after being coated with the positive ion polyacrylate leather finishing agent. Furthermore, the leather finishing agent provided by the invention does not contain APEO (alkylphenol ethoxylates), and no methanol is released. Moreover, the preparation method has the advantages of suitability for industrial production and stabilization in batch.

Description

technical field [0001] The invention belongs to the technical field of leather finishing agents, in particular to a cationic polyacrylate leather finishing agent and a preparation method thereof. Background technique [0002] Leather finishing agent is a material that can form a film or coating on the leather surface by wiping, brushing, spraying or pouring, mainly including polyacrylate, coloring materials, solvents and additives. The leather finishing agent can increase the beauty and durability of the leather, improve the grade of the leather, increase the variety of leather designs and colors and expand the range of use of the leather. [0003] The prior art discloses a variety of leather finishing agents, mainly including modified polyurethane leather finishing agents, modified polyacrylate leather finishing agents, protein adhesives and nitrocellulose, etc., wherein the modified polyurethane leather finishing agents have polyurethane and cyclic The excellent performan...

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Problems solved by technology

[0003] The prior art discloses a variety of leather finishing agents, mainly including modified polyurethane leather finishing agents, modified polyacrylate leather finishing agents, protein adhesives and nitrocellulose, etc., wherein the modified polyurethane leather finishing agents have polyurethane and cyclic The excellent performance of oxygen resin has good waterproof and wear resistance, which can make the product beautiful, smooth and prolong the service life; nitrocellulose has the advantages of brightness, beauty, acid resistance, oil resistance, water resistance, etc., but it is not resistant to aging and cold resistance. , poor air permeability after film formation; the main component of protein adhesive is casein, which has the advantages of soft and natural coating luster, strong adhesion, high temperature ironing resistance, real leather touch, and good water and gas permeability of leather. However, casein contains various hydrophilic groups such as amino groups, imino groups, carboxyl groups, etc., and must be modified to improve its extensibility, flex resistance, moisture resistance and other properties before it can be used as a leather finishing agent; Acrylic leather finishing agent is currently the most widely used leather finishing agent, with light resistance, aging resistance and moisture resistance

[0004] The prior art discloses a variety of modified polyacrylate leather finishes, which can be classified into anion-modified polyacrylate leather finishes and cationic-modified polyacrylate leather finishes according to the different initiators used, wherein the anion The modified polyacrylate leather finishing agent is anionic, and when it finishes the leather, there is no affinity between the coating and the leather surface, and its adhesion is mainly due to the adhesion of the film-forming agent, which is prone to weak adhesion , the coating is easy to fall off, etc., which affects the finishing quality of the leather, and the coating formed by the cationic polyacrylate leather finishing agent has strong adhesion to the leather surface, the coating is not easy to fall off, and will not affect the finishing quality of the leather

For example, Zhou Yali and others synthesized a cationic polyacrylate leather finishing agent with trimethylolpropane triacrylate as a cross-linking monomer (The effect of TMPTA cross-linking system on the performance of cationic acrylate leather finishing agent, Zhou Yali, Li Wenxin, China Leather, 2008.11 ), however, trimethylolpropane triacrylate has high cross-linking strength, which will affect the handle of leather after forming a coating, and is not suitable for bottom coating; Fan Haojun et al. synthesized cationic Polyacrylate leather finishing agent (Study on the synthesis of cationic acrylic resin emulsion finishing agent, Fan Haojun, Shi Bi, Chemical Bulletin, 2001.11), but this leather finishing agent not only has a high film-forming temperature, but also releases formaldehyde during the film-forming process, polluting the environment