Plastic brightening agent OB and preparation method thereof

A whitening agent and plastic technology, applied in organic chemistry and other directions, can solve the problems that the reaction is difficult to reach the end point, the material is easy to become very thick, and the reaction is not easy to complete, and the reaction is uniform and sufficient, not easy to aggregate, and the reaction is fast and complete. Effect

CN112174947APending Publication Date: 2021-01-05季德虎
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-01-05

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Abstract

The invention provides a plastic brightening agent OB. The plastic brightening agent OB is characterized by being prepared from a plastic brightening agent OB crude product, N-methylpyrrolidone and methanol, wherein the plastic brightening agent OB crude product is prepared from the following components in parts by weight: 24-26 parts of thiophene dicarboxylic acid, 45-47 parts of o-amino-p-tert-butylphenol, 123-125 parts of a condensation solvent, 2-3 parts of boric acid, 0.5-0.7 part of a catalyst and 105-110 parts of dimethylformamide; the ratio of the N-methylpyrrolidone to the plastic brightening agent OB crude product in parts by weight is 1-2:1; and the ratio of the methanol to the plastic brightening agent OB crude product in parts by weight is 3-5: 1. According to the plastic brightening agent OB and the preparation method thereof, the production process is rapid and uniform in reaction, free of aggregation, few in impurity, few in by-product and high in purity.
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Description

technical field

[0001] The invention relates to the technical field of plastic colorants and their preparation, in particular to a plastic brightener OB and a preparation method thereof. Background technique

[0002] Fluorescent whitening agents can be regarded as a kind of colorless dyes. After they are dyed on fibers, paper and other substrates, they can absorb ultraviolet rays and emit blue light, thereby offsetting the yellow feeling caused by excessive yellow light reflection on the fabric. It produces white and dazzling effect visually. Different types of fluorescent whitening agents can be used for whitening treatment of various fibers. They are processed directly onto the fabric, where they are fixed to the fibers by self-affinity or cross-linking agents.

[0003] Plastic brightener OB, Chinese name: 2.5-bis-(5-tert-butyl-2-benzoxazolyl)thiophene, molecular formula C 26 h 26 N 2 o 2 S, mainly used for whitening PVC, PS, PE, PP, ABS and other plastics. Its struc...

Examples

Embodiment 1

[0023] A kind of plastic brightener OB, described plastic brightener OB is made by plastic brightener OB crude product, N-methylpyrrolidone and methanol; Wherein, described plastic brightener OB crude product is made of thiophene di 25 parts of carboxylic acid, 46 parts of o-amino p-tert-butylphenol, 124 parts of condensation solvent, 2.5 parts of boric acid, 0.6 part of catalyst and 108 parts of dimethylformamide; The whitening agent OB crude product is in the ratio of 1.5:1 by weight; the ratio of the methanol and the plastic whitening agent OB crude product is 4:1 by weight. The condensation solvent is composed of diphenyl ether and toluene, and the ratio of the diphenyl ether to the toluene is 1.5:1 in parts by weight.

[0024] A kind of preparation method of plastic brightener OB, concrete steps are as follows:

[0025] (1) condensation

[0026] Add 2,5-thiophene dicarboxylic acid and o-amino-p-tert-butylphenol into the condensation tank, the stirring speed is 50r / min, ...

Embodiment 2

[0031] A kind of plastic brightener OB, described plastic brightener OB is made by plastic brightener OB crude product, N-methylpyrrolidone and methanol; Wherein, described plastic brightener OB crude product is made of thiophene di 24 parts of carboxylic acid, 47 parts of o-amino p-tert-butylphenol, 123 parts of condensation solvent, 3 parts of boric acid, 0.5 part of catalyst and 105-110 parts of dimethylformamide; the N-methylpyrrolidone and the The ratio of the plastic brightener OB crude product is 1:1 by weight; the ratio of the methanol and the plastic brightener OB crude product is 5:1 by weight. The condensation solvent is composed of diphenyl ether and toluene, and the ratio of the diphenyl ether to the toluene is 1:1 in parts by weight.

[0032] A kind of preparation method of plastic brightener OB, concrete steps are as follows:

[0033] (1) condensation

[0034] Add 2,5-thiophene dicarboxylic acid and o-amino-p-tert-butylphenol into the condensation tank, stirri...

Embodiment 3

[0039] A kind of plastic brightener OB, described plastic brightener OB is made by plastic brightener OB crude product, N-methylpyrrolidone and methanol; Wherein, described plastic brightener OB crude product is made of thiophene di 26 parts of carboxylic acid, 45 parts of o-amino p-tert-butylphenol, 125 parts of condensation solvent, 2 parts of boric acid, 0.7 part of catalyst and 105 parts of dimethylformamide; The crude product of whitening agent OB is in the ratio of 2:1 by weight; the ratio of methanol and the crude product of plastic brightener OB is 3:1 by weight. The condensation solvent is composed of diphenyl ether and toluene, and the ratio of the diphenyl ether to the toluene is 2:1 in parts by weight.

[0040] A kind of preparation method of plastic brightener OB, concrete steps are as follows:

[0041] (1) condensation

[0042]Add 2,5-thiophene dicarboxylic acid and o-amino-p-tert-butylphenol into the condensation tank, the stirring speed is 60r / min, the stirri...