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Granulation method for hindered amine light stabilizer

A light stabilizer and hindered amine technology, which is applied in the field of preparation of hindered amine light stabilizer particles, can solve the problems of weak molecular force, large floor space, and high cost, and achieve uniform size, small equipment investment, and particle size regular effect

Active Publication Date: 2020-06-09
RIANLON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the convenience of transportation and use, high-molecular-weight light stabilizers, especially polymeric HALS products, are often prepared into granules, because their molecular weight is about 1000-5000, the molecular weight is relatively small, and the force between molecules is weak, so it is not suitable to use traditional The strip method, because there will be problems such as the strip is not easy to form, the strip is easy to break, and the pellets are easy to break.
[0006] The traditional granulation method of high molecular weight light stabilizers, especially polymeric HALS, is steel belt granulation. This method requires large equipment investment, large floor area, high cost and low cost performance
At present, the mainstream process of high-molecular-weight light stabilizers in the industry, especially polymeric HALS, is to extrude the light stabilizer under pressure, pack it with disks and other equipment, and physically break it after cooling; this process has a strong odor and the particles are irregular particles. , and there is a large amount of powder, which will affect both the environment and personnel

Method used

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  • Granulation method for hindered amine light stabilizer
  • Granulation method for hindered amine light stabilizer
  • Granulation method for hindered amine light stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The granulation of embodiment 1 light stabilizer 622

[0087] (1) Melting pressure building: after the preparation reaction of the light stabilizer 622 is completed, the reaction molten liquid is transported to the mixer, and the pressure of the molten body at the outlet of the molten body in the mixer is controlled to be 0.2-0.4Mpa;

[0088] (2) Melt pump pressure stabilization: the light stabilizer in the mixer is stabilized by the melt pump, and the pressure of the melt at the outlet of the melt pump is controlled to be 0.6-0.8Mpa;

[0089] (3) Underwater pelletizing: adjust the water temperature of the water circulation system to 35° C., adjust the temperature of the die head for underwater pelletizing to 130° C., and the rotating speed of the cutter to 4100 rpm for pelletizing. After granulation, it was centrifuged and dried at 200 rpm to obtain light stabilizer 622 particles.

Embodiment 2

[0090] The granulation of embodiment 2 light stabilizer 622

[0091] (1) Melting pressure building: after the preparation reaction of light stabilizer 622 is completed, the reaction molten liquid is transported to the mixer, and the pressure of the molten body outlet in the control mixer is 0.7-0.9Mpa;

[0092] (2) Underwater pelletizing: adjust the water temperature of the water circulation system to 32° C., adjust the die head temperature of underwater pelletizing to 110° C., and the rotating speed of the cutter to 2000 rpm for pelletizing. After pelletizing, centrifuge and dry at 300 rpm to obtain light stabilizer 622 particles.

Embodiment 3

[0093] The granulation of embodiment 3 photostabilizer 622

[0094] (1) Melting pressure building: after the preparation reaction of light stabilizer 622 is completed, the reaction molten liquid is transported to the mixer, and the pressure of the molten body outlet in the control mixer is 0.6-0.8Mpa;

[0095] (2) Underwater pelletizing: adjust the water temperature of the water circulation system to 37° C., adjust the temperature of the die head for underwater pelletizing to 120° C., and the rotating speed of the cutter to 4000 rpm for pelletizing. After granulation, it was centrifuged and dried at 250 rpm to obtain light stabilizer 622 particles.

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Abstract

The invention relates to a granulation method for a hindered amine light stabilizer. The method comprises the steps that an underwater granule cutting system is used for performing granulation on thehindered amine light stabilizer, and manufacturing light stabilizer granules. According to the technology, the problems that a traditional steel belt is high in granulation cost, powder is caused during physical crushing, and granules are not regular are solved. The manufactured granules are regular, uniform in size, free of dust, free of environmental contamination and small in equipment investment.

Description

technical field [0001] The invention discloses a preparation method of hindered amine light stabilizer particles, which belongs to the technical field of auxiliary agent granulation. Background technique [0002] Light stabilizer is an additive of polymer products, it can shield or absorb the energy of ultraviolet rays, quench singlet oxygen and decompose hydroperoxide into inactive substances, etc. , can eliminate or slow down the possibility of photochemical reaction, prevent or delay the process of photoaging, so as to achieve the purpose of prolonging the service life of polymer products. It mainly includes UV absorbers and hindered amine light stabilizers. [0003] Hindered Amine Light Stabilizer (HALS for short) is an efficient additive for inhibiting photooxidative degradation of polymer materials, and its light stabilizing effect is 2-4 times that of traditional absorbing light stabilizers. This type of substance has a good synergistic effect with ultraviolet absor...

Claims

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Application Information

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IPC IPC(8): B29B9/06C08K5/3492
CPCB29B9/065C08K5/3492
Inventor 成新云卢红伟安平刘永胜余铁孙春光李海平
Owner RIANLON