A kind of preparation method of ultraviolet absorber uv-p

A UV-P, absorber technology, applied in the direction of organic chemistry, can solve the problems of increased workload, inaccuracy, manual control in batch mode, etc., to reduce pollution, reduce demand, and avoid excessive reaction speed. Effect
CN105924404BActive Publication Date: 2019-06-14福建帝盛科技股份有限公司
5 Cites 1 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
福建帝盛科技股份有限公司
Publication Date
2019-06-14

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention discloses a preparation method of an ultraviolet light absorber UV-P. The preparation method includes the following steps that an azo intermediate shown in the formula (I) is reduced into nitric oxide shown in the formula (II) through a reducing agent, nitric oxide is reduced into a product shown in the formula (III) through the reducing agent, and the reducing agent is formed by sintering metal powder and an adsorbent, wherein the formula (I), the formula (II) and the formula (III) are shown in the description. The preparation method has the advantages that the use amount of the metal powder is small, environmental pollution is low, operation is convenient and easy, and the yield of the product is high.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a kind of preparation method of ultraviolet absorber, more specifically, it relates to a kind of preparation method of ultraviolet absorber UV-P. Background technique

[0002] The existing synthesis methods of benzotriazole ultraviolet absorbers mainly use azobenzene compounds as raw materials and carry out reduction according to different reduction processes. According to different reducing agents used, the reduction of benzotriazole compounds can be divided into one-step method and two-step method. The so-called one-step method is to use a reducing agent to reduce the azo dye to the product, and the so-called two-step method is to use a reducing agent to reduce the dye to nitrogen oxides. According to the situation, the nitrogen oxides can be separated or not separated, and then The nitrogen oxide intermediate is reduced to the final product with another reducing agent.

[0003] A large number of experiments have sh...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More