A kind of water-soluble lignin piperidinamine light stabilizer and its preparation method and application

A technology of plain piperidinamine light and plain piperidinamine, which is applied in the field of lignin materials, can solve the problems that the anti-ultraviolet performance is difficult to achieve chemically synthesized light stabilizers, the content of functional groups is small, the molecular agglomeration is serious, and the like, and the light resistance is increased. The effect of decomposing groups, large molecular weight and less side reactions

Active Publication Date: 2019-11-15
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the current commercial lignin mainly comes from the waste of the pulp and paper industry. Its molecules are seriously agglomerated and mainly exist in the form of micron-sized particles, which are difficult to disperse evenly and the color is too dark; and the content of functional groups that can effectively remove free radicals is too small. The UV resistance of unmodified lignin is also difficult to reach the level of chemically synthesized light stabilizers

Method used

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  • A kind of water-soluble lignin piperidinamine light stabilizer and its preparation method and application
  • A kind of water-soluble lignin piperidinamine light stabilizer and its preparation method and application
  • A kind of water-soluble lignin piperidinamine light stabilizer and its preparation method and application

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Effect test

Embodiment 1

[0031] Dissolve 100g of alkali lignin in an alkaline aqueous solution to make a 20% solid solution, adjust the pH of the solution to 10; raise the temperature to 80°C, add 40g of piperidine, stir and mix evenly; then add 25g of formaldehyde dropwise to the above mixture In the solution, after 30 minutes of dropwise addition, the temperature was raised at 90° C. for 2 hours to obtain the lignin-based piperidine derivative. Structural diagram see figure 1 .

Embodiment 2

[0033] Dissolve 100g of alkali lignin in an alkaline aqueous solution to prepare a 30% solid solution, adjust the pH of the solution to 11; raise the temperature to 85°C, add 50g of 4-amino-2,2,6,6-tetramethylpiperene Pyridine, stirred and mixed evenly; then 30g of formaldehyde was added dropwise to the above mixed solution, after 60min of dropwise addition, reacted at 85°C for 3h to obtain the lignin-based piperidinamine derivative.

Embodiment 3

[0035] Dissolve 100g of alkali lignin in an alkaline aqueous solution to prepare a 40% solid solution, adjust the pH of the solution to 11; raise the temperature to 90°C, add 32g of 1-(3-methoxypropyl)-4-piperidine Amine, stirred and mixed evenly; then 10g of propionaldehyde was added dropwise to the above mixed solution, after 60min of dropwise addition, reacted at 90°C for 1h to obtain the lignin-based piperidine amine derivative.

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Abstract

The invention belongs to the technical field of lignin materials and discloses a water-soluble lignin piperidylamine light stabilizer as well as a preparation method and an application thereof. According to the preparation method, firstly, an alkaline solution is prepared from lignin, piperidylamine is added, aldehyde is dropwise added for a Mannich reaction, and lignin piperidylamine is prepared.The light stabilizer is prepared from components in parts by mass as follows: 100 parts of lignin, 10-30 parts of aldehyde and 30-50 parts of piperidylamine. The invention also provides the water-soluble lignin piperidylamine light stabilizer prepared with the method. The light stabilizer has excellent light stabilization, a typical amphiphilic structure of a surfactant and large molecular weight. The light stabilizer contains a piperidylamine structure, has a photolysis-resistant function and structural characteristics of a hindered amine light stabilization group and a high molecular surfactant and can be used in various light stabilization aid fields such as water-based dosage forms of pesticides, water-based coatings, water-based ink, sun cream, high molecular materials and the like as a high molecular surfactant with the light stabilization function.

Description

technical field [0001] The invention belongs to the technical field of lignin materials, in particular to a water-soluble lignin piperidinamine light stabilizer and its preparation method and application. Background technique [0002] Lignin is a natural macromolecular aromatic polymer from plants. Structurally, lignin is mainly composed of three basic structural units of guaiacylpropane, p-hydroxyphenylpropane and syringylpropane through enzymes. Obtained by deoxygenation polymerization and free radical coupling. During the polymerization into natural lignin, the disappearance of electrons on the vinyl group conjugated to the hydroxyl group on the benzene ring produces a UV chromophore, resulting in lignin absorbing UV / visible light. At the same time, the existence of functional group structures such as carbonyl and double bonds in lignin also makes lignin have a wider range of ultraviolet absorption. In addition, the phenolic hydroxyl group on the benzene ring structure i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C08G12/26C08L23/06C08L61/32
CPCC08G12/26C08G12/40C08L23/06C08L2201/08C08L2207/066C08L61/32
Inventor 周明松汪冬平邱学青杨东杰庞煜霞
Owner SOUTH CHINA UNIV OF TECH
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