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Acrylic resin/SiO2 nano composite tanning agent and preparation method thereof

A technology of acrylic resin and compound tanning agent, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, animal husbandry, etc., can solve the problem of poor product stability and product application Effects such as unsatisfactory skin tensile strength, etc., achieve the effects of low cost, good strength and elasticity, and simple preparation process

Inactive Publication Date: 2008-08-13
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is still insufficient in terms of shrinkage temperature, leather thickening and physical and mechanical properties; the second is to use "grafting" technology to graft nanoparticles with special properties onto the tanning agent material molecules, or use surface technology to It is evenly dispersed in the tanning agent, and the tanning process is adjusted according to the properties of the material, so that these particles are evenly dispersed and firmly fixed between the leather fibers to achieve better tanning purposes
For example, Gao Dangge et al. dispersed nanoparticles into the commercialized Lekotan970 retanning agent by ultrasound (Research on the Preparation and Application of Acrylic Resin / Silicon Dioxide Retanning Agent, China Leather, Volume 36, Issue 1, January 2007 ), the nano-retanning agent was prepared by the physical method of blending, but the stability of the obtained product was poor, and the application effect of the product, such as the tensile strength of the skin, was not satisfactory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 27 parts by mass of a-methacrylic acid, 3 parts by mass of butyl acrylate, and 0.9 parts of SiO with unsaturated double bonds on the surface 2Nanoparticles, 100 parts of deionized water were mixed, mechanically stirred and mixed evenly, and then the mixed system was dispersed under the action of ultrasonic waves for 10 minutes, the temperature of the mixed system was raised to 40°C, and 0.3 parts by mass of A solution of ammonium persulfate in 10 parts deionized water. After the aqueous solution of the initiator is added dropwise, the temperature of the system is raised to 75°C, and the reaction is kept at this temperature for 4 hours, and the temperature of the system is raised to 95°C in the last 0.5 hour until the reaction is complete. Cool down to room temperature, add 40% NaOH aqueous solution dropwise to the reaction system under stirring to adjust the final pH value of the solution to 5, and control the internal temperature during the whole process to not ex...

Embodiment 2

[0025] Take 24 parts by mass of a-methacrylic acid, 3 parts by mass of butyl acrylate, and 1 part of SiO with unsaturated double bonds on the surface 2 Nanoparticles, 100 parts of deionized water were mixed, mechanically stirred and mixed evenly, and then the mixed system was dispersed under the action of ultrasonic waves for 12 minutes, the temperature of the mixed system was raised to 42 °C, and 0.6 parts by mass of supernatant was slowly added dropwise to the reaction system under stirring. A solution of ammonium sulfate dissolved in 10 parts by mass of deionized water. After the aqueous solution of the initiator is added dropwise, the temperature of the system is raised to 78°C, and the reaction is kept at this temperature for 4.2 hours, and the temperature of the system is raised to 95°C in the last 0.5 hour until the reaction is complete. Cool down to room temperature, add 40% NaOH aqueous solution dropwise to the reaction system under stirring to adjust the final pH of ...

Embodiment 3

[0027] Take 21 parts by mass of a-methacrylic acid, 3 parts by mass of butyl acrylate, and 1.2 parts of SiO with unsaturated double bonds on the surface 2 Nanoparticles, 95 parts of deionized water were mixed, mechanically stirred and mixed evenly, and then the mixed system was dispersed under the action of ultrasonic waves for 14 minutes, the temperature of the mixed system was raised to 44 °C, and 0.9 parts by mass of supernatant was slowly added dropwise to the reaction system under stirring. A solution of ammonium sulfate dissolved in 10 parts by mass of deionized water. After the aqueous solution of the initiator is added dropwise, the temperature of the system is raised to 80°C, and the reaction is kept at this temperature for 4.5 hours, and the temperature of the system is raised to 95°C in the last 0.5 hour until the reaction is complete. Cool down to room temperature, add 40% NaOH aqueous solution dropwise to the reaction system under stirring to adjust the final pH v...

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Abstract

The invention relates to an acrylics / SiO2 nano-composite tanning agent. The nano-composite tanning agent appears to be light yellow or yellow semitransparent ropy liquid, the mass concentration is 20 to 35%, the viscosity is 500 to 1000MPa.s, the pH value is 5 to 8, and the storage stable period is over 12 months. With only 2% (relative to the leather weight) chromium powder, the nano-composite tanning agent can thicken the leather by 124.5%, the shrinkage temperature reaches to 95 DEG C.; compared with a chrome tanned leather, a leather tanned by the nano-composite tanning agent has a tensile strength, peeling strength and elongation at break improved by 51.8%, 8.2% and 13.3% respectively, has no obvious stratification or sedimentation during over 12 months of storage period. Water is used as solvent when prepared, which is low-cost and pollution-free; the preparing technology is simple, the reaction is mild, the polymerization process is easy to control, so that the nano-composite tanning agent is easy to realize industrial production, the synthesized material is inexpensive and easy to obtain as well.

Description

(1) Technical field [0001] The invention belongs to the field of functional polymer synthesis of nanocomposite tanning agents for leather, in particular to an acrylic resin / SiO 2 Nano-composite tanning agent. (2) Background technology [0002] With the transfer of the world's tanning center to Asia, my country has become a major tanning country in the world. However, the environmental pollution caused by tanning has seriously affected the development of the tanning industry. The annual discharge of waste liquid in my country's leather industry is about 70 million tons. Among these pollutants, chromium is the most toxic, but no matter what method is adopted, as long as chromium is involved, it will inevitably cause permanent pollution of chromium ions. The unreduced hexavalent Cr ions attached to leather products will directly cause damage to human skin and induce various diseases, and chromium resources are also in short supply nowadays. The fundamental way to solve the abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22C08F292/00C08F2/16C08K3/36
Inventor 潘卉张治军吴志申
Owner HENAN UNIVERSITY
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