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Spandex yellow inhibitor UDT synthesis technology

A technology of fiber anti-yellowing agent and synthetic ammonia, which is applied in the field of synthesizing dimethane, also known as spandex anti-yellowing agent UDT, can solve the problems of yellowing, serious color, affecting product quality, etc., and achieve energy saving, good properties and lower production costs. Effect

Inactive Publication Date: 2015-10-07
XIAN AEROSPACE PROPULSION TESTING TECHN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this process, the product encloses the raw material MDI more seriously. During the drying process of the product, the entrained raw material MDI undergoes a polymerization reaction due to heating, which seriously affects the product quality.
In addition, foreign countries use 20% excess unsymmetrical dimethylhydrazine relative to MDI for production. Although this method can ensure the complete reaction of MDI, the large excess of unsymmetrical dimethylhydrazine will cause the reaction product to undergo oxidation reaction due to the residual unsymmetrical dimethylhydrazine. And the color turns yellow, which affects the product quality

Method used

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  • Spandex yellow inhibitor UDT synthesis technology
  • Spandex yellow inhibitor UDT synthesis technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dilute 52g of raw material unsymmetrical dimethylhydrazine with 250mL of toluene and place it in a 2L three-necked flask. Dissolve 100g of raw material MDI in 750mL of toluene. The solution was added to the unsymmetrical dimethylhydrazine solution at a rate of 25 mL / min, and the reaction was continuously stirred at 30° C. for 30 min. After the reaction is completed, stand and age at room temperature for 1 hour to precipitate the target product spandex anti-yellowing agent UDT, filter and wash under reduced pressure to obtain the crude product of spandex anti-yellowing agent UDT, and obtain the UDT product after drying, calculate the yield, and The purity analysis was carried out, and the data are shown in Table 1.

Embodiment 2

[0027] Dilute 53g of raw material unsymmetrical dimethylhydrazine with 250mL of toluene and place it in a 2L three-necked flask. Dissolve 100g of raw material MDI in 750mL of toluene. The solution was added to the unsymmetrical dimethylhydrazine solution at a rate of 25 mL / min, and the reaction was continuously stirred at 30° C. for 30 min. After the reaction is completed, stand and age at room temperature for 1 hour to precipitate the target product spandex anti-yellowing agent UDT, filter and wash under reduced pressure to obtain the crude product of spandex anti-yellowing agent UDT, and obtain the UDT product after drying, calculate the yield, and The purity analysis was carried out, and the data are shown in Table 1.

Embodiment 3

[0029] Dilute 54g of raw material unsymmetrical dimethylhydrazine with 250mL of toluene and place it in a 2L three-necked flask. Dissolve 100g of raw material MDI in 750mL of toluene. The solution was added to the unsymmetrical dimethylhydrazine solution at a rate of 25mL / min, and the reaction was continuously stirred at 30°C for 30 minutes. The crude spandex anti-yellowing agent UDT product was obtained by pressure suction filtration and washing, and the UDT product was obtained after drying treatment. The yield was calculated and the purity analysis was carried out. The data are shown in Table 1.

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Abstract

The present invention discloses a spandex yellow inhibitor UDT (N, N-dimethyl-amino-4-phenyl-hydrazide) synthesis technology, by drop-wise addition of a MDI (methylene diphenyl diisocyanate) toluene solution into an unsymmetrical dimethylhydrazine toluene solution for reaction, the synthesis technology effectively avoids raw material MDI inclusion in product, and the synthesized product is high in purity, good in character, even and easy to crush. Compared with conventional synthesis process, the synthesis process effectively avoids raw material MDI inclusion in the product, so that the synthesized product spandex yellow inhibitor UDT (N, N-dimethyl-amino-4-phenyl-hydrazide) has high purity and low chroma, and the product has a good character. Meanwhile, the process provides an efficient way for processing UDMH (unsymmetrical dimethylhydrazine) waste solution, and can turn waste into treasure.

Description

technical field [0001] The invention relates to a process for synthesizing bis(N,N-dimethylhydrazideamino-4-phenyl)methane, also known as spandex anti-yellowing agent UDT. The spandex anti-yellowing agent UDT synthesized by this method has high purity and excellent properties. it is good. Background technique [0002] Spandex anti-yellowing agent UDT (also known as anti-yellowing agent HN-150) is a downstream product of unsymmetrical dimethylhydrazine (UDMH, namely 1,1-dimethylhydrazine), and is one of the necessary auxiliary agents in spandex production. Spandex is polyurethane elastic fiber, which is a new type of fiber with fine fineness, high elasticity, large elastic modulus, small specific gravity, good dyeability and fastness. As the largest producer of spandex in the world, my country's annual output reached 389,700 tons in 2013, and the production volume is increasing year by year. Spandex anti-yellowing agent UDT is a special light stabilizer, which can improve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C281/06
Inventor 兰海平于君梁兴国吴金杨超燕珂徐涛李宁
Owner XIAN AEROSPACE PROPULSION TESTING TECHN INST
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