Modified casein, leather finishing agent and preparation method thereof

A technology of leather finishing agent and casein, which is applied in leather surface treatment, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc. It can solve the problems affecting the quality of leather finishing, Insufficient adhesion, easy peeling of the coating, etc., to achieve strong adhesion, stable product quality, and improved leather grades

Active Publication Date: 2012-07-04
SICHUAN DOWELL SCI & TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology improves how well-made materials like caseinate are treated with certain chemical agents or modifications made from them. These modification results in improved performance compared to existing methods such as adding ammonium sulfate (AS) into casesalt solution during manufacturing process. Additionally, this treatment enhances the bonding strength between coatings and substrates without causing damage to their appearance when applied over time. Overall, these technical improvements result in better durability and overall usages efficiency in making high-quality leathers.

Problems solved by technology

This patented technical problem addressed in this patents relates to improves the appearance (lustreiness) and longevity of lithiated products like chrome tanned rubber surfaces without compromising their qualities. Specifically, these improvements involve modifying existing polymer coatings called neochromed ones, specifically modified casesins made from collagen, albumen, aluminum flakes, calcium salts, glue, and other chemical compounds. These modifications help create better appearances and longer lifetimes compared to unmodified versions.

Method used

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  • Modified casein, leather finishing agent and preparation method thereof

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preparation example Construction

[0052] The invention provides a kind of preparation method of leather finishing agent, comprises the following steps:

[0053] a) dissolving casein and organic acid in water to obtain casein aqueous solution;

[0054] b) adding caprolactam to the aqueous casein solution obtained in the step a), and reacting to obtain an intermediate product;

[0055] c) adding a preservative to the intermediate product obtained in the step b), and stirring to obtain a leather finishing agent.

[0056] The invention uses caprolactam as a modifying agent to undergo graft polycondensation reaction with casein under the condition of dissolving casein with organic acid to directly obtain cationic casein leather finishing agent. The preparation method provided by the invention is simple and convenient, easy to produce in batches, and has stable product quality.

[0057] The present invention first dissolves casein and organic acid in water, so that casein is completely dissolved in water under org...

Embodiment 1

[0089] Weigh the following raw materials respectively:

[0090] 300g boiling water, 50g casein, 8g propionic acid, 30g caprolactam, 0.48g BIOBAN TM I-20 Antimicrobial and 0.64g BIOBAN TM ULTRA BIT 20 Antimicrobial;

[0091] Cool 20% of the total amount of boiling water to 60°C, add all the caprolactam to dissolve it, and obtain an aqueous solution of caprolactam;

[0092] Cool 5% of the total amount of boiling water to 60°C, add all BIOBAN TM I-20 Antimicrobial makes it all dissolve, obtains the first preservative aqueous solution;

[0093] Cool 5% of the total amount of boiling water to 60°C, add all BIOBAN TM ULTRA BIT 20 Antimicrobial is used to dissolve it completely to obtain the second preservative aqueous solution;

[0094] Add 70% of the total amount of boiling water into the reaction kettle, start stirring, add all the casein, and heat to 70°C to 75°C, and stir for 1 hour; add all the propionic acid into the reaction kettle, stir for 2 hours, and make the cas...

Embodiment 2

[0097] Weigh the following raw materials respectively:

[0098] 300g boiling water, 50g casein, 8g lactic acid, 0.45gV50, 32g caprolactam, 0.48gBIOBAN TM I-20 Antimicrobial and 0.64g BIOBAN TM ULTRA BIT 20 Antimicrobial;

[0099] Cool 25% of the total amount of boiling water to 55°C, add all the V50 to dissolve it, and obtain an aqueous initiator solution;

[0100] Cool 10% of the total amount of boiling water to 55°C, add all the caprolactam to dissolve it completely, and obtain an aqueous solution of caprolactam;

[0101] Cool 2% of the total amount of boiling water to 55°C and add all BIOBAN TM I-20 Antimicrobial makes it all dissolve, obtains the first preservative aqueous solution;

[0102] Cool 3% of the total amount of boiling water to 55°C and add all BIOBAN TM ULTRA BIT 20 Antimicrobial is used to dissolve it completely to obtain the second preservative aqueous solution;

[0103] Add 60% of the total amount of boiling water into the reaction kettle, start sti...

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Abstract

The invention provides modified casein, which is prepared via grafting polycondensation of caprolactam and casein in organic acid. The invention also provides a leather finishing agent and a preparation method thereof. Since the modified casein is prepared via modification of the casein through the caprolactam with the presence of the organic acid, the defects of the casein material such as hard film, no extension and easy breaking are overcome. Moreover, the modified casein is cationic and has good affinity to an anionic leather surface when being used as the leather finishing agent to form a coating. Therefore, the coating has strong adhesion to the leather surface and cannot easily fall off, and the finishing quality of leather cannot be affected. The leather finishing agent with the solid content higher than 15 percent is prepared via mixing of the modified casein, preservatives and water. When the leather finishing agent is coated on the leather, the leather becomes soft, plump and natural, the defects of stitches and scabies can be overcome effectively, the rate of utilization of the leather can be increased, and the level of the leather can be improved.

Description

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Claims

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Application Information

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Owner SICHUAN DOWELL SCI & TECH INC
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