Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of chromium-free tanning agent

The technology of a chrome-free tanning agent and an acid binding agent is applied in the field of preparation of a chrome-free tanning agent, and can solve the problems of low free formaldehyde content, easy detanning, energy consumption, time-consuming and the like, and achieves a simple and easy operation process, Short tanning time and energy saving effect

Active Publication Date: 2017-05-17
SHAANXI UNIV OF SCI & TECH
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vegetable tanned leather is characterized by plump and tight leather body, high shrinkage temperature, strong resistance to chemical agents and proteases, and good hygienic performance. Defects such as surface
[0003] Xu Jiali et al. used Granofin F-90, TWT, STF and Tanfor T-A goatskin for tanning respectively. After tanning, the shrinkage temperature of the leather was greater than 74°C, and it had good resistance to washing and detanning, and acid and alkali resistance. No or low free formaldehyde content (Xu Jiali, Tang Jie, Zheng Rulan, etc. Comparative study on the tanning properties of several chrome-free tanning agents[J]. China Leather, 2015,44(16):9-15); However, most of the chrome-free tanning agents have a long tanning time and high temperature, and the control of the tanning process is relatively complicated, which consumes a lot of energy and time in actual leather production.
In addition, Yang Meng et al. used vegetable-aluminum salt combined tanning method, vegetable-aldehyde combined tanning method and synthetic tanning agent-resin combined tanning method to realize chrome-free tanning, which solved the tanned base produced by tanning with chrome-free tanning agent alone. Problems of low shrinkage temperature and poor physical and mechanical properties of leather (Yang Meng, Li Rui, Li Wei, etc. Application of common chrome-free combined tanning method[J]. Leather Science and Engineering, 2015, 25(2): 27 -31); However, the formaldehyde and aluminum salts introduced by this method will still cause harm to the ecological environment, and are also harmful substances explicitly restricted in the export standards of leather products, and there are problems of complicated tanning process and difficult control

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of chromium-free tanning agent
  • Preparation method of chromium-free tanning agent
  • Preparation method of chromium-free tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, a kind of preparation method of chrome-free tanning agent comprises the following steps:

[0020] 1) Add 17.4g of p-hydroxybenzenesulfonic acid and 150g of deionized water into a four-neck flask, neutralize with 4g of sodium hydroxide, keep stirring until dissolved, put it in an ice bath, and add 18.5g of cyanuric chloride at one time , keeping the temperature at 0°C, continuously adjusting the pH of the system with a sodium carbonate solution with a mass concentration of 10%, until the pH of the system is stable at 5.0, and then continuing to react for 1.0 h to obtain a mixture A;

[0021] 2) Mixture A is warmed up to 40 DEG C, and 12.2 g of p-Hydroxybenzaldehyde dissolved in 20 g of acetone are added dropwise with stirring, and the pH of the system is constantly adjusted with a sodium carbonate solution with a mass concentration of 10%, so that the pH is stabilized at 6.5. Continue to react for 3.0 hours after the addition of materials; raise the tempera...

Embodiment 2

[0023] Embodiment 2, a kind of preparation method of chrome-free tanning agent comprises the following steps:

[0024] 1) Add 17.3g of p-aminobenzenesulfonic acid and 150g of deionized water into a four-neck flask, neutralize with 4g of sodium hydroxide, keep stirring until dissolved, put it in an ice bath, and add 18.5g of cyanuric chloride at one time , keeping the temperature at 5°C, continuously adjusting the pH of the system with a potassium carbonate solution with a mass concentration of 10%, until the pH of the system is stabilized at 6.0, and then continuing to react for 1.5 hours to obtain a mixture A;

[0025] 2) Mixture A is warmed up to 40 DEG C, and 12.2 g of p-Hydroxybenzaldehyde dissolved in 20 g of acetone is added dropwise with stirring, and the pH of the system is constantly adjusted with a potassium carbonate solution with a mass concentration of 10%, so that the pH is stabilized at 6.5. Continue to react for 3.0 hours after adding the materials; raise the t...

Embodiment 3

[0027] Embodiment 3, a kind of preparation method of chrome-free tanning agent comprises the following steps:

[0028] 1) Add 13.8g of p-hydroxybenzoic acid and 150g of deionized water into a four-necked flask, and neutralize with 4g of sodium hydroxide, keep stirring until dissolved, then place it in an ice bath, and add 18.5g of cyanuric chloride at one time, Keeping the temperature at 2°C, continuously adjust the pH of the system with a sodium carbonate solution with a mass concentration of 10%, until the pH of the system is stable at 6.0, and then continue the reaction for 2.0 hours to obtain a mixture A;

[0029] 2) Mixture A is warmed up to 45 DEG C, and 12.2g of p-Hydroxybenzaldehyde dissolved in 20g of acetone is added dropwise with stirring, and the pH of the system is constantly adjusted with a sodium carbonate solution of 10% in mass concentration to make the pH stable at 6.5. Continue to react for 3.0 hours after adding the materials; raise the temperature of the s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
temperatureaaaaaaaaaa
temperatureaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method of a chromium-free tanning agent, comprising the following steps: adding a hydrophilic group containing active compound and deionized water into a four-necked flask, neutralizing with sodium hydroxide, continuously stirring till dissolution, putting into an ice bath, adding cyanuric chloride, and regulating the pH value of the system with a solution of an acid binding agent to obtain a mixture A; heating the mixture A, dropwise adding p-hydroxy benzaldehyde dissolved in acetone while stirring, regulating the pH value of the system with the solution of the acid binding agent, and continuing the reaction after the materials are added; heating the system, dropwise adding p-hydroxy benzaldehyde dissolved in acetone, regulating the pH value of the system with the solution of the acid binding agent, continuing the reaction after the materials are added, cooling and discharging to obtain a mixture B; and filtering the mixture B, carrying out vacuum drying on the filter cake to obtain solid C, grinding and pulverizing the solid C to obtain the white powdered form chromium-free tanning agent. The chromium-free tanning agent can eliminate pollution from chromic salt, aluminum salt and formaldehyde and can be well absorbed, and the tanned crust leather has a white fine grain surface and is easy to be dyed into light-colored leather.

Description

technical field [0001] The invention relates to the technical field of leather chemical tanning agent synthesis, in particular to a preparation method of a chrome-free tanning agent. Background technique [0002] The excellent sensory feel and physical and mechanical properties of chrome tanned leather make chrome powder the most widely used tanning material in the leather industry. During the chrome tanning process, the utilization rate of chromium is only 60% to 70%, and the chromium-containing wastewater, sludge, and waste chrome chips produced after tanning have caused huge pressure on the ecological environment. Scholars at home and abroad have conducted a lot of research on chrome-free tanning: such as using other mineral tanning agents instead of chrome tanning agents, such as titanium, aluminum, etc.; combining tanning with vegetable tanning agents and metal ions; combining tanning with vegetable tanning agents and organic crosslinking agents. Among them: zirconium ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/46C07D251/30C14C3/08
CPCC07D251/30C07D251/46C14C3/08
Inventor 强西怀崔璐李玉郭灼能李成涛张辉
Owner SHAANXI UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com