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

Light-color tannin extracts and preparation method thereof

A technology of tannin extract and light color, which is applied in the field of light-color tannin extract and its preparation. It can solve the problems of failure to meet the requirements, the undisclosed preparation of light-color tannin extract ratio, and the high total chroma value of Luo Weibang, so as to improve the reaction Activity, reducing the degree of damage, reducing the effect of being oxidized

Inactive Publication Date: 2015-02-04
广西壮族自治区百色林化总厂
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, this method does not disclose the specific process for preparing light-colored tannin extracts and the ratio of raw materials. There has been great technological progress in application, but it has not been able to meet the requirements of high-end tanning industry for tannin extract

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
  • Light-color tannin extracts and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Dissolve 100 parts of Myrica tomentosa extract and 250 parts of water in a sealed reactor with a stirrer, add 3 parts of sodium formate, 5 parts of sodium hyposulfite, 12 parts of sodium bisulfite, 3 parts of oxalic acid, and 3 parts of citric acid, At a vacuum degree of 0.03Mpa, a temperature of 55°C, and a reaction time of 3 hours, the reaction is completed, and the obtained reaction product is a light-colored liquid tannin extract, or the reaction product is spray-dried to obtain a powdery light-colored tannin extract. After detection and analysis, the physical and chemical indicators of the tannin extract are shown in attached table 1.

Embodiment 2

[0043] Dissolve 100 parts of acacia extract and 250 parts of water completely in a sealed reaction kettle with a stirrer, add 0.5 parts of sodium hydroxide, 3 parts of pyrosulfite sodium, 2 parts of sulfurous acid, and 1 part of oxalic acid. 0.04 Mpa, temperature 60°C, reaction time 4 hours, the reaction is completed, the obtained reaction product is light-colored liquid tannin extract, or the reaction product is spray-dried to obtain powdery light-colored tannin extract. After detection and analysis, the physical and chemical indicators of the tannin extract are shown in attached table 1.

Embodiment 3

[0045] Completely dissolve 100 parts of Vitex bark extract and 250 parts of water in a sealed reaction kettle with a stirrer, add 1 part of potassium hydroxide, 6 parts of pyrosulfite sodium, 3 parts of sodium bisulfite, and 2 parts of acetic acid. The vacuum degree is 0.05 Mpa, the temperature is 65°C, and the reaction time is 5 hours. After the reaction is completed, the obtained reaction product is light-colored liquid tannin extract, or the reaction product is spray-dried to obtain powdery light-colored tannin extract. After detection and analysis, the physical and chemical indicators of the tannin extract are shown in attached table 1.

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

No PUM Login to View More

Abstract

The invention discloses light-color tannin extracts and a preparation method thereof, which is characterized by choosing dark natural tannin extracts as raw materials, adding alkali, reduction agents and aufhellung assistants to react 3 to 10 hours in the vacuum degree <=0.1Mpa at the temperature <=90 DEG C, and obtaining reaction products, namely light-color liquid tannin extracts after reaction finishes, or spray drying the reaction products to achieve powdery light-color tannin extracts. The tannin content of the light-color tannin extracts is larger than or equal to 69wt%, the non-tannin content is smaller than or equal to 25wt%, the undissolved substance content is smaller than or equal to 3wt%, the potential of hydrogen (pH) is 4.5 to 5.5, the moisture content is 5.0wt% to 10.0wt%, and lovibond total chromatic value is smaller than or equal to 3.4.

Description

technical field [0001] The invention belongs to the technical fields of forest product chemical industry and leather chemical industry, and in particular relates to a light-colored tannin extract and a preparation method thereof. Background technique [0002] Tannin extract is a concentrated product extracted from plant materials with a plant tannin content of more than 50%. The main use of tannin extract is to tan leather, and the consumption accounts for about 90% of the output of tannin extract. Tannin is used for tanning leather, and there are three tanning methods: vegetable tanning, retanning and combination tanning of vegetable and other tanning agents. The process of tanning raw hides with tannin as the main tanning agent is called vegetable tanning, and the amount of tannin used for vegetable tanning is generally 20% to 60% of the gray skin weight. Utilizing the good filling properties of tannin extract, it is often used for retanning or filling of chrome tanned l...

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 Patents(China)
IPC IPC(8): C14C3/12
Inventor 梁发星陈晓程王明吉
Owner 广西壮族自治区百色林化总厂
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