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Light stabilizer, preparation method and uses thereof

A technology of light stabilizer and active agent, applied in the field of light stabilizer and its preparation, can solve the problems of unstable whiteness of high-yield pulp, high input cost, limited scope of use, etc., and achieve the effect of good light stabilization effect

Active Publication Date: 2019-11-19
鲁新兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the whiteness of high-yield pulp is unstable, which greatly limits its application range. This is mainly because a large amount of lignin contained in high-yield pulp undergoes chemical reactions under the influence of natural light, heat, moisture and other factors, resulting in new lignin. Chromogenic or auxochromic groups cause yellowing or color reversion. Adding chemical additives is considered to be one of the most potential and effective methods to inhibit photo-induced yellowing of high-yield pulp
The current research hotspots mainly focus on two categories of ultraviolet absorbers and free radical scavengers, but using one of them alone or in combination is not only costly but also unsatisfactory.

Method used

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  • Light stabilizer, preparation method and uses thereof
  • Light stabilizer, preparation method and uses thereof
  • Light stabilizer, preparation method and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of light stabilizer, comprising the following steps:

[0027] S1. Dissolve 1 mol of methyl salicylate in dichloromethane, slowly add 1.2 mol of thionyl chloride dropwise under ice bath, stir while dropping, at a speed of 200r / min, continue to stir for 2 hours after the dropwise addition, and stop the reaction , the solvent was removed by rotary evaporation, washed with water, and suction filtered to obtain the intermediate;

[0028] S2. Add 1.2mol 2,2',6,6'-tetramethylpiperidinamine to the reaction kettle, adjust the pH value to 5 with 1mol / L hydrochloric acid solution, control the reaction temperature to 10°C, and add 1mol intermediate At the same time, the temperature is gradually raised to 50°C, and the reaction continues until the pH value does not change. Slowly raise the temperature to 85°C, react until the amino value disappears, cool to room temperature, distill under reduced pressure, wash repeatedly with acetone, and dry to obtain photosta...

Embodiment 2

[0030] A preparation method of light stabilizer, comprising the following steps:

[0031] S1. Dissolve 1 mol of methyl salicylate in dichloromethane, slowly add 1.5 mol of thionyl chloride dropwise under ice bath, stir while dropping, at a speed of 500r / min, continue to stir for 3 hours after the dropwise addition, and stop the reaction , the solvent was removed by rotary evaporation, washed with water, and suction filtered to obtain the intermediate;

[0032] S2. Add 1.5mol 2,2',6,6'-tetramethylpiperidinamine to the reaction kettle, adjust the pH value to 6 with 2mol / L hydrochloric acid solution, control the reaction temperature to 15°C, and add 1mol intermediate At the same time, the temperature is gradually raised to 60°C, and the reaction continues until the pH value does not change. Slowly raise the temperature to 90°C, react until the amino value disappears, cool to room temperature, distill under reduced pressure, wash repeatedly with acetone, and dry to obtain photosta...

Embodiment 3

[0034] A preparation method of light stabilizer, comprising the following steps:

[0035] S1. Dissolve 1 mol of methyl salicylate in dichloromethane, slowly add 1.35 mol of thionyl chloride dropwise under ice bath, stir while dropping, at a speed of 350r / min, continue to stir for 2 hours after the dropwise addition, and stop the reaction , the solvent was removed by rotary evaporation, washed with water, and suction filtered to obtain the intermediate;

[0036] S2. Add 1.3mol 2,2',6,6'-tetramethylpiperidinamine to the reaction kettle, adjust the pH value to 5.5 with 1.5mol / L hydrochloric acid solution, control the reaction temperature to 12°C, and drop 1mol intermediate At the same time, the temperature is gradually raised to 55°C, and the reaction continues until the pH value does not change. Slowly raise the temperature to 87°C, react until the amino group value disappears, cool to room temperature, distill under reduced pressure, wash repeatedly with acetone, and dry to obt...

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Abstract

The present invention provides a light stabilizer, which has a structure represented by a formula I. The light stabilizer emulsifying composition contains water, an emulsifier and a light stabilizer,wherein the components having an average particle size of 150 nm or less and used for forming the light stabilizer emulsifying composition are dispersed in water, and the emulsifier comprises a nonionic surfactant (A) and a nonionic surfactant (B). According to the present invention, the obtained light stabilizer emulsifying composition has excellent light stabilizing effect on materials, whereinthe whiteness stabilizing effect can maintain at above 60% after aging for 24 h in an ultraviolet lamp weather-resistant test box, and the paper yellowing value is less than 35%.

Description

technical field [0001] The invention relates to the technical field of light stabilizers, in particular to a light stabilizer and its preparation method and application. Background technique [0002] In recent years, the emergence of high-yield pulping technology can be used as one of the ways to solve the shortage of fiber raw materials. The use of high-yield pulp in paper and board containing mechanical pulp is more common. High-yield pulping has the advantages of low investment, high pulping yield, low production cost, and less environmental pollution. However, the whiteness of high-yield pulp is unstable, which greatly limits its application range. This is mainly because a large amount of lignin contained in high-yield pulp undergoes chemical reactions under the influence of natural light, heat, moisture and other factors, resulting in new lignin. Chromogenic or auxochromic groups cause yellowing or color reversion. Adding chemical additives is considered to be one of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D211/58D21H17/07D21H21/38
CPCC07D211/58D21H17/07D21H21/38
Inventor 鲁新兵
Owner 鲁新兵
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