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A kind of light stabilizer and preparation method thereof

A light stabilizer and catalyst technology, which is applied in the field of chemical product manufacturing, can solve the problems of single function of light stability, enhance the anti-aging effect of light stabilizer, and achieve little effect, so as to achieve high-efficiency light stability, optimize production methods, The effect of high added value

Active Publication Date: 2018-08-10
ZHENXING FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the existing photostabilizers have a single function. Even if they are combined with antioxidants and other additives to produce a synergistic effect and greatly enhance the anti-aging effect of photostabilizers, the effect is minimal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of light stabilizer 726 of the present invention:

[0030] (1) In a 500ml four-necked bottle equipped with a condenser, a water separator, a foam puff, a reflux tube, a thermometer and an agitator, and assembled according to a conventional method, quantify 25.1g of 4-methoxy Dimethyl benzylidene malonate, 18.5g methoxy piperidinol and 45g mineral spirits are put into the synthesis kettle;

[0031] (2) Start the agitator, heat to 110°C at 200 revolutions per minute, add 0.3g of lithium amide catalyst, start reflux to demethanolize until the reflux sight glass becomes clear, and the reaction time is 5 hours;

[0032] (3) Add 27.5g of molten stearyl alcohol dropwise. After methanol starts to come out, continue to reflux the demethanol until it becomes clear on the reflux sight glass. The reaction time is 5 hours; the sampling test is qualified; then filter and desolventize and use molecular distillation , the vacuum degree during molecular distillat...

Embodiment 2

[0035] (1) In a 500ml four-necked bottle equipped with a condenser, a water separator, a foam puff, a reflux tube, a thermometer and an agitator, and assembled according to a conventional method, quantify 38g of 4-methoxy Dimethyl benzylidene malonate, 27.8g methoxypiperidinol and 160g mineral spirits are put into the synthesis kettle;

[0036] (2) Start the agitator, heat to 120°C at 240 revolutions per minute, add 0.5 g of sodium methoxide catalyst, and start reflux to demethanolize until the reflux sight glass becomes clear. The reaction time is 3 hours;

[0037] (3) Add 42.5g of molten stearyl alcohol dropwise. After the methanol starts to come out, continue to reflux the demethanol until it becomes clear on the reflux mirror. The reaction time is 5 hours. Distillation, vacuum degree during molecular distillation reaches 40Pa, temperature is 90 ℃, obtains qualified product.

[0038] The light stabilizer 726 prepared in this example has a product yield of 92% and a mixed e...

Embodiment 3

[0040] (1) In a 1000ml four-necked bottle equipped with a condenser, a water separator, a foam puff, a reflux tube, a thermometer and an agitator, and assembled according to a conventional method, quantify 125g of 4-methoxy Dimethyl benzylidene malonate, 42.5g methoxy piperidinol and 350g mineral spirits are put into the synthesis kettle;

[0041] (2) Start the agitator, heat at 220 rpm to 115°C under the reaction conditions, add 0.5g of sodium methoxide catalyst, start reflux to remove methanol until the reflux sight glass becomes clear, and the reaction time is 4 hours;

[0042] (3) Add 68g of molten stearyl alcohol dropwise. After methanol starts to come out, continue to reflux to remove methanol until it becomes clear on the reflux mirror. The reaction time is 6 hours. , the vacuum degree during molecular distillation reaches 30Pa, the temperature is 90°C, and qualified products are obtained.

[0043] The light stabilizer 723 prepared in this example has a product yield o...

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Abstract

The invention discloses a light stabilizer and a preparation method thereof. The light stabilizer has a structural formula as shown in the specification, and the preparation method comprises the following steps: firstly, preparing methoxy piperidinol, then performing esterification synthetic reaction, performing washing, dehydration, decoloration and filtration, and finally, performing filtration for solvent removal through an after-treatment step to prepare the light stabilizer, wherein the esterification synthetic reaction is performed by taking methoxy piperidinol, octadecanol and 4-methoxy-benzylidene methylmalonate as raw materials, and a one-pot method step-by-step esterification method is adopted for preparation. According to the preparation method disclosed by the invention, a one-pot method step-by-step esterification synthetic process is adopted to solve the problem of difficult separation and purification due to the requirement of product separation in the conventional one-pot method two-step esterification method for preparing the light stabilizer, the purity of a mixed ester reaches 96% or higher, and the yield of a final product reaches 92% or higher. The light stabilizer disclosed by the invention is mainly applied to an engineering plastic PC and other aspects and has a very good effect, the product is a multifunctional type light stabilizer and has a very good anti-aging effect, and as a high-grade light stabilizer, the product has an extremely high added value.

Description

technical field [0001] The invention relates to a light stabilizer, and also relates to a preparation method of the light stabilizer, which belongs to the field of chemical products production. Background technique [0002] Some substances added to barrier or inhibit photoredox or photoaging process are called photostabilizers. To effectively prevent and retard photoaging in the industry, two or more antiaging agents with different mechanisms of action are often compounded, because various antiaging agents, especially light absorbers, have their own different absorption bands for ultraviolet rays. Compound formulations such as: benzophenone + benzotriazoles plus hindered amines (HAL) can achieve the best effect that a single light stabilizer cannot achieve. [0003] In the plastic industry, a plastic light stabilizer is a substance that can inhibit or weaken the degradation effect of light on plastics and improve the light resistance of plastic raw materials. Most of them ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/3435C08L69/00C08L23/12C08L27/06C07D211/94
CPCY02P20/52
Inventor 夏跃雄张玉杰
Owner ZHENXING FINE CHEM CO LTD
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