Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of phosphorus nitrogen series leather flame retardant retanning agent

A retanning agent and phosphorus-nitrogen-based technology, applied in the field of leather chemicals, can solve problems such as long flameless burning time, thick smoke, and unpleasant odors, and achieve improved flame-retardant durability, improved flame-retardant efficiency, and improved water solubility. Effects on Sexuality and Storage Stability

Inactive Publication Date: 2019-09-20
SICHUAN UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the leather is ignited, it takes a long time to burn without flame, and when it burns, it produces unpleasant smell and thick smoke. Performance Product Requirements

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
  • A kind of preparation method of phosphorus nitrogen series leather flame retardant retanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Phosphorus-nitrogen complex reaction: After dissolving thiourea in water, add tetrakis-hydroxymethyl phosphorus sulfate, so that the molar ratio of organic nitrogen compound and tetrakis-hydroxymethyl phosphorus ion is 1:1, and then use borax to adjust the system pH to 8.0, stirred and reacted at 95°C for 30min to obtain intermediate product A; (2) active group formation reaction: Cool intermediate product A to 80°C, add glyoxal, aldehydes and tetrakis hydroxymethyl phosphonium ion The molar ratio is 1:1, and the reaction is stirred at 80°C for 90 minutes to obtain the intermediate product B; (3) sulfitation reaction: add sodium pyrosulfite to the intermediate product B to make the sulfite reagent and tetrakishydroxymethylphosphonium ion The molar ratio is 0.3:1, and the reaction is stirred at 80°C for 60 minutes; after the above three-step reaction, a viscous transparent liquid can be obtained, which is the finished phosphorus nitrogen-based flame retardant retannin...

Embodiment 2

[0033] (1) Phosphorus-nitrogen compound reaction: After dissolving melamine in water, add tetrakis-hydroxymethylphosphorus chloride to make the molar ratio of organic nitrogen compound and tetrakishydroxymethylphosphorus ion 4.5:1, and then adjust it with sodium carbonate System pH to 9.5, stirred and reacted at 70°C for 60min to obtain intermediate product A; (2) active group generation reaction: cool intermediate product A to 50°C, add glutaraldehyde, aldehydes and tetrakis hydroxymethyl phosphonium ion The molar ratio is 1.5:1, stirred and reacted at 50°C for 30 minutes to obtain the intermediate product B; (3) sulfitation reaction: add sodium sulfite to the intermediate product B to make the sulfite reagent and tetrakis hydroxymethyl phosphonium ion The molar ratio is 0.4:1, and the reaction is stirred at 50°C for 30 minutes; after the above three-step reaction, a viscous transparent liquid can be obtained, which is the finished phosphorus nitrogen-based flame retardant ret...

Embodiment 3

[0035] (1) Phosphorus-nitrogen complex reaction: After dissolving dicyandiamide in water, add tetrakis hydroxymethyl phosphorus sulfate, so that the molar ratio of organic nitrogen compound and tetrakis hydroxymethyl phosphorus ion is 1.5:1, and then adjust with ammonia water System pH to 8.5, stirred and reacted at 80°C for 150min to obtain intermediate product A; (2) active group generation reaction: cool intermediate product A to 65°C, add formaldehyde, aldehydes and tetrakis hydroxymethyl phosphonium ions The ratio is 3.5:1, stirred and reacted at 65°C for 45 minutes to obtain the intermediate product B; (3) sulfitation reaction: add sodium bisulfite to the intermediate product B to make the sulfite reagent and tetrakishydroxymethyl phosphonium ion The molar ratio is 0.6:1, stirred and reacted at 65°C for 120 minutes; after the above three-step reaction, a viscous transparent liquid can be obtained, which is the finished phosphorus nitrogen-based flame retardant retanning a...

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
oxygen indexaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a phosphorus-nitrogen leather flame-retardant retanning agent. The preparation method is characterized in that the preparation reaction comprises the following three steps: (1) phosphorus-nitrogen composite reaction, namely, an organonitrogen compound and tetrahydroxymethyl phosphate are mixed based on the molar ratio of at least 1: 1 and dissolved in water; the pH is regulated to be beyond 8.0 through an alkaline substance; the materials are reacted for at least 30min under 70-95 DEG C with stirring, and thus an intermediate product A is obtained; (2) active group generation reaction, namely, the intermediate product A is cooled to reach the temperature of 50-80 DEG C; aldehydes materials are added, and the molar ratio of the aldehydes materials to tetrakisphosphonium ions is 1: 1; the materials are reacted for at least 30min under the temperature of 50-80 DEG C with stirring, and thus an intermediate product B is obtained; and (3) sulfitation reaction, namely, a sulfitation agent is added to the intermediate product, and the molar ratio of the sulfitation agent to tetrakisphosphonium ions is at least 0.3: 1; and the materials are reacted for at least 30min under the temperature of 50-80 DEG C with stirring; and a thick and transparent phosphorus-nitrogen leather flame-retardant retanning agent liquid product can be obtained through the abovementioned reaction in the three steps. The flame-retardant retanning agent synthesized by the method is high in flame retardance, and high in retanning performance.

Description

technical field [0001] The invention belongs to the technical field of leather chemicals, and in particular relates to a preparation method of a phosphorus-nitrogen leather flame-retardant retanning agent. Background technique [0002] Leather is often used in various industries such as automobiles, furniture, clothing and accessories because of its special properties such as good softness, unique appearance, excellent air permeability, wear resistance, sweat resistance and heat insulation. Compared with textiles such as cotton, linen and wool, leather has better natural flame resistance. The oxygen index of finished leather without flame retardant treatment is generally between 21% and 27%, which belongs to the range of self-extinguishing materials, and there is no high-temperature molten material dripping when burning. However, after the leather is ignited, it takes a long time to burn without flame, and when it burns, it produces unpleasant smell and thick smoke. perfor...

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): C14C3/08
Inventor 陈武勇张金伟程凡吴佳城
Owner SICHUAN UNIV