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Synthesis and application of durable flame retardant of nitrogen-phosphorus synergistic system for cotton without halogen and formaldehyde release
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A formaldehyde release, durable flame retardant technology, applied in the periodic table group 5/15 element compounds, plant fibers, organic chemistry and other directions, can solve the problems of long time, high reaction temperature, complexity, etc. The effect of high flame retardant efficiency and simple process
Active Publication Date: 2019-10-11
JIANGSU NIMATE SCI & TECH CO LTD
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The reaction temperature in the preparation process is high and the time is long, and the small molecular substances produced by the reaction need to be vacuumed out. During the application process, crosslinking agents, catalysts, and fiber protection agents are required. The application process includes two dipping and two rolling, drying, and baking. , alkali washing, water washing, drying and other processes are more complicated
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Embodiment 1
[0019] 1. Put 170 grams of N, N-methylene bisacrylamide into a four-necked flask, heat and melt, then add 124 grams of dimethyl methyl phosphate, and add 0.05 grams of catalyst dibutyltin dilaurate at the same time, while stirring Raise the temperature to 75-80°C, keep the temperature for about 2 hours, and cool down to room temperature to obtain Intermediate A;
[0020] 2. Put 300 grams of intermediate A obtained above into a four-necked flask, add a certain amount of aqueous solution, first adjust the pH to 8-9 with triethanolamine, raise the temperature of the reaction solution to 85-90°C, and slowly add it dropwise while stirring 130 g of 1,4-dichlorobutane was incubated and reacted for 2 hours to obtain the final product B.
Embodiment 2
[0022] 1. Put 175 grams of N, N-methylene bisacrylamide into a four-necked flask, heat and melt, then add 128 grams of dimethyl methyl phosphate, and add 0.06 grams of catalyst dibutyltin dilaurate at the same time, while stirring Raise the temperature to 75-80°C, keep the temperature for about 3 hours, and cool down to room temperature to obtain Intermediate A;
[0023] 2. Put 300 grams of intermediate A obtained above into a four-necked flask, add a certain amount of aqueous solution, first adjust the pH to 8-9 with triethanolamine, raise the temperature of the reaction solution to 85-90°C, and slowly add it dropwise while stirring 135 g of 1,4-dichlorobutane was incubated and reacted for 3 hours to obtain the final product B.
[0024] Application method of a halogen-free and formaldehyde-free nitrogen-phosphorus synergistic system for cotton durable flame retardant (Example 1 final product B: toluene 2,4-diisocyanate)
[0025]
[0026] The product obtained in the above ...
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Abstract
The invention relates to synthesis and application methods of a halogen-free and formaldehyde-emission-free cotton permanent flame retardant of a nitrogen-phosphorus collaboration system. The synthesis method is characterized by comprising the following steps of (1), putting N,N-methylene bisacrylamide into a four-mouth flask, heating, melting, then putting dimethyl methylphosphate, meanwhile, adding a catalyst dibutyltin dilaurate or sodium methoxide, raising a temperature to 75 to 80 DEG C while agitating, carrying out heat preservation, reacting for approximately 2 to 3 hours, and cooling to a room temperature to obtain an intermediate A; (2), putting the obtained intermediate A into the four-mouth flask, adding an aqueous solution, firstly regulating pH (potential of Hydrogen) to be between 8 and 9 by using triethanolamine, raising the temperature of a reaction solution to 85 to 90 DEG C, slowly dropwise adding 1,4-dichlorobutane while agitating, carrying out the heat preservation,and reacting for 2 to 3 hours, so that a final product B can be obtained. The halogen-free and formaldehyde-emission-free cotton permanent flame retardant has the characteristics of being simple in process, high in flame retarding efficiency and a few in the influence on the strength and the hand feeling of a textile.
Description
technical field [0001] The invention belongs to the field of functional finishing of textiles, and specifically relates to a method for synthesizing and applying a durable flame retardant of a nitrogen-phosphorus synergistic system for cotton that is free of halogen and formaldehyde. Background technique [0002] In recent years, the fires that have occurred in my country have become more and more frequent, which have brought great loss of life and playgrounds to people. Among them, the proportion of fires caused by burning textiles is increasing year by year. Therefore, the global market demand for flame retardants has been expanding in recent years. Because the extreme oxygen index of cotton is only 18.0, which is the lowest among commonly used fibers, and it is a flammable fiber. Aiming at this phenomenon, we specially developed a durable flame retardant for cotton fibers. At present, there are mainly two types of durable flame retardants for cotton commonly used in the...
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