A kind of anti-ultraviolet composite material, preparation method and application of hydrotalcite-confined synthesis of Schiff base molecules

A technology of anti-ultraviolet and composite materials, which is applied in the field of Schiff bases, can solve the problems of limited application fields, easy ultraviolet aging, poor weather resistance, etc., achieve the effects of cheap and easy-to-obtain raw materials, simple and efficient synthesis, and avoid environmental problems

Active Publication Date: 2019-01-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its poor weather resistance, it is very easy to age under the action of ultraviolet light and oxygen, causing discoloration, hardening and cracking of the parts. Unmodified PP can only be used as a general-purpose plastic, with limited application fields and easy ultraviolet aging. Therefore, modifying PP to improve its anti-aging performance has always been a hot issue in the field of polymer materials.

Method used

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  • A kind of anti-ultraviolet composite material, preparation method and application of hydrotalcite-confined synthesis of Schiff base molecules
  • A kind of anti-ultraviolet composite material, preparation method and application of hydrotalcite-confined synthesis of Schiff base molecules
  • A kind of anti-ultraviolet composite material, preparation method and application of hydrotalcite-confined synthesis of Schiff base molecules

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Step A: Accurately weigh 0.12mol (35.6988g) of Zn(NO 3 ) 2 ·6H 2 O and 0.06mol (22.5078g) of Al(NO 3 ) 3 9H 2 O, dissolved in 100ml to remove CO 2 deionized water, formulated to contain [Zn 2+ ]=1.2mol / L, [Al 3+ ]=0.6mol / L mixed salt solution; Weigh the NaOH of 0.36mol (14.4000g), be dissolved in 150ml to remove CO 2 deionized water, configured to contain [OH - ]=3.6mol / L alkali solution. Using the nucleation / crystallization isolation method, the two solutions were fed into a fully back-mixed liquid film reactor with a rotation speed of 3000r / min at the same flow rate through a peristaltic pump to rapidly nucleate. After obtaining the slurry, transfer it to a 250ml three-necked bottle quickly, and pass N 2 Protected, heated to 80°C under rapid stirring, and crystallized in a constant temperature water bath at 80°C for 6 hours. The product was centrifuged to separate the filter cake and used to remove CO 2 Wash with deionized water until the filtrate pH ≈ 7, ...

Embodiment 2

[0037] Step A: Accurately weigh 0.12mol (35.6988g) of Zn(NO 3 ) 2 ·6H 2 O and 0.06mol (22.5078g) of Al(NO 3 ) 3 9H 2 O, dissolved in 100ml to remove CO 2 deionized water, formulated to contain [Zn 2+ ]=1.2mol / L, [Al 3+ ]=0.6mol / L mixed salt solution; Weigh the NaOH of 0.36mol (14.4000g), be dissolved in 150ml to remove CO 2 deionized water, configured to contain [OH - ]=3.6mol / L alkali solution. Using the nucleation / crystallization isolation method, the two solutions were fed into a fully back-mixed liquid film reactor with a rotation speed of 3000r / min at the same flow rate through a peristaltic pump to rapidly nucleate. After obtaining the slurry, transfer it to a 250ml three-necked bottle quickly, and pass N 2 Protected, heated to 80°C under rapid stirring, and crystallized in a constant temperature water bath at 80°C for 6 hours. The product was centrifuged to separate the filter cake and used to remove CO 2 of deionized water until the filtrate pH ≈ 7, the fil...

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Abstract

The invention provides a hydrotalcite confinement synthesis Schiff base molecule anti-ultraviolet composite material, a preparation method and an application. Intercalated hydrotalcite is selected as a molecular reactor, organic salt with an amino structure is introduced in an intercalated manner, the Schiff base molecules are synthesized in a confined manner by adding neutral molecules of aldehydes and the like, the neutral molecules can be used for enhancing anti-ultraviolet aging performance of PP (polypropylene), the optimal adding amount of the neutral molecules is 3wt%, the hydrotalcite serves as the molecular reactor to synthesize Schiff base, yield can reach 100%, the method is environmentally friendly and high in yield as compared with a method for synthesizing the Schiff base in a reflux manner by the aid of other organic solvents such as methyl alcohol and ethyl alcohol, the method has remarkable economic benefits and popularization values, the composite material prepared by the method has excellent ultraviolet absorption performance, broadband ultraviolet rays can be absorbed as cis-trans structures of the Schiff base can be switched, and the composite material is applied to a plurality of fields.

Description

technical field [0001] The invention belongs to the field of Schiff bases, and specifically provides an anti-ultraviolet material, a preparation method and an application of hydrotalcite-confined synthetic Schiff base molecules. The functional material is added to high polymer materials such as polypropylene to resist ultraviolet aging role. Background technique [0002] Polypropylene (PP) is currently the polymer material with the largest output and the most widely used in synthetic resins. However, due to its poor weather resistance, it is very easy to age under the action of ultraviolet light and oxygen, causing discoloration, hardening and cracking of the parts. Unmodified PP can only be used as a general-purpose plastic, with limited application fields and easy ultraviolet aging. Therefore, modifying PP to improve its anti-aging performance has always been a hot issue in the field of polymer materials. At present, organic intercalated hydrotalcites have been used in p...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08K9/04C08K3/22C08L23/12
CPCC08K3/22C08K9/04C08L2201/08C08L23/12
Inventor林彦军夏春辉闫东鹏李凯涛杨阳
OwnerBEIJING UNIV OF CHEM TECH