保定紫外线吸收剂厂

紫外线吸收剂介绍及其应用

Introduction and application of ultraviolet absorbents

什么是紫外线吸收剂

What is a UV absorber

1、紫外线吸收剂是一类可防止太阳光或其他人造紫外光引起聚合物降解的物质，是一种光稳定剂。

1. Ultraviolet absorber is a kind of substance that can prevent the degradation of polymer by sunlight or other artificial ultraviolet light. It is a light stabilizer.

2、由于太阳光线中含有大量对有色物体有害的紫外光，其波长约290-460nm，这些有害的紫外光通过化学上的氧化还原作用，使颜色分子最后分解褪色，而使用紫外线吸收剂对受保护的物体可以实施有效的防止或削弱其对颜色的破坏。

2. Due to a large amount of ultraviolet light that is harmful to colored objects in the sun's light, its wavelength is about 290-460nm. These harmful ultraviolet light can finally decompose color molecules by chemical oxidation and reduction, and the UV Absorbents can effectively prevent or weaken the color breaking of the protected objects. Bad.

3、加入紫外线吸收剂后可选择性地吸收这种高能量的紫外线，使之变成无害的能量而释放或消耗。由于聚合物的种类不同，使其劣化的紫外线波长也不相同，不同的紫外线吸收剂可吸收不同波长的紫外线，使用时，应根据聚合物的种类选择紫外线吸收剂。

3, adding ultraviolet absorbers can selectively absorb this high energy ultraviolet light, making it harmless energy to release or consume. Because of the different kinds of polymers, the ultraviolet wavelengths of the degradation are different. The different ultraviolet absorbents can absorb the ultraviolet light of different wavelengths. When used, the UV Absorbents should be selected according to the types of polymer.

紫外线吸收剂的机理

The mechanism of ultraviolet absorbents

1、紫外线吸收剂之所以能吸收紫外光是由于该类化合物分子中含有共轭π电子体系的结构与能够进行氢原子移动的结构两部分所致。也有的只有前一部分。

1. Ultraviolet absorbents can absorb ultraviolet light because of the structure of the conjugated electron system in the compounds and the two part of the structure that can move the hydrogen atom. There are also only the previous parts.

2、紫外线吸收剂其结构分子中至少含有一个邻位羟基苯基取代基，这类化合物中由邻位羟基与氮原子或氧原子形成一螯合环，在吸收紫外线后，氢键断裂发生分子异构，分子内结构发生热振动，氢键破坏，螯合环打开，分子内结构发生变化，这样就将有害的紫外光变为无害的热能放出，从而保护了材料，

2. The UV absorber contains at least one ortho hydroxyphenyl substituent in its structure molecule. In this kind of compound, a chelation ring is formed by the ortho hydroxyl group and the nitrogen atom or oxygen atom. After absorbing UV, the hydrogen bond breaks the molecular isomerism, the intramolecular structure occurs thermal vibration, the hydrogen bond is destroyed, the chelate ring opens, and the intramolecular. The structure changes, so that harmful ultraviolet light can be changed into harmless heat released, thus protecting the material.

3、在这个过程中，分子内所形成的螯合环是其具有吸收紫外线功能的关键，打开此环的能量敏感范围正好为290～400nm波长的紫外线能量范围。

3. In this process, the intramolecular chelation ring is the key to its ultraviolet absorption function, and the energy sensitive range of the ring is just 290 ~ 400nm wavelengths of ultraviolet energy range.

4、另外，作为紫外线吸收剂，还必须能在紫外光或可见光的作用下不进行光化学反应；对化学药品 及水稳定性好，对热的稳定性好；挥发性小；对高分子材料的相容性好及不被溶剂萃取等。

4, in addition, as a UV absorber, it must also be able to do no photochemical reaction under the action of ultraviolet or visible light; the stability of chemicals and water is good, the stability of heat is good, the volatility is small, the compatibility of the polymer materials is good and the solvent is not extracted.

紫外线吸收剂应该具备的条件

Conditions for ultraviolet absorbents

1、可强烈地吸收紫外线（尤其是波长为290-400nm）；

1, UV absorption can be strongly absorbed (especially at 290-400nm wavelength).

2、热稳定性好，即使在加工中也不会因热而变化，热挥发性小；

2, thermal stability is good, even in processing, it will not change due to heat, and heat volatility is small.

3、化学稳定性好，不与制品中材料组分发生不利反应；

3, chemical stability is good, and does not react negatively with material components in products.

4、混溶性好，可均匀地分散在材料中，不喷霜，不渗出；

4, miscibility is good, can be evenly dispersed in the material, no frost, no exudation;

5、吸收剂本身的光化学稳定性好，不分解，不变色；

5, the absorbent itself has good photochemical stability, no decomposition and no discoloration.

6、无色、无毒、无臭；

6, colorless, non-toxic, odorless;

7、耐浸洗；

7.

8、价廉、易得；

8, low price, easy to get;

9、不溶，或难溶于水。

9, insoluble, or insoluble in water.

紫外线吸收剂的分类

Classification of ultraviolet absorbents

按化学结构划分，紫外线吸收剂可分为水杨酸酯类、苯酮类、苯并三唑类、取代丙烯腈类、三嗪类和受阻胺类。

According to chemical structure, UV absorbers can be divided into salicylic acid esters, benzophenones, benzo three azole, substituted acrylonitrile, three azine and hindered amines.

苯并三唑类

Benzo three azole

该类化合物是紫外线吸收剂中产量最大，品种最多的一类产品，国内外的研究也很活跃。苯并三唑类紫外线吸收剂的合成一般是使芳香胺重氮化生成重氮盐，重氮盐与酚类化合物进行偶合反应生成中间体偶氮颜料，再经还原闭环而成。

This kind of compound is the product with the largest output and the largest variety of ultraviolet absorbers. The research at home and abroad is also very active. The synthesis of benzo three azoles is generally made of diazotization of aromatic amines to produce diazonium salts, and diazonium salts are coupled with phenolic compounds to produce intermediate azo pigments, and then closed by reduction.

二苯甲酮类

benzophenone type

该类紫外线吸收剂产量和品种仅次于苯并三唑。

The yield and variety of the UV absorber are only inferior to benzo three azole.

其合成路线基本上为两步反应,即2 ,4 - 二羟基二苯酮的合成和烷氧基二苯酮的合成。

The synthetic route is basically a two step reaction, that is, the synthesis of 2, 4 - two hydroxyl two benzophenone and the synthesis of alkoxy two benzophenone.

紫外线吸收剂研究方向

Research direction of ultraviolet absorbents

1、高分子质量化

1, high polymer quality

降低助剂挥发性，减少反应过程中的损失

Reduce the volatiles and reduce the loss during the reaction.

2、多功能化

2, multifunction

使一个稳定剂分子中同时具有不同功能的基团,起到多种稳定作用（热稳定剂，抗氧剂……）

A group of molecules with different functions at the same time can play a variety of stabilizing roles (heat stabilizer, antioxidant...).

3、反应性化

3, reactivity

将反应性基团引入光稳定剂分子中，使其在加工时与基础聚合物键合，从而永久存在于高分子材料中

The reactive group is introduced into the light stabilizer molecule, so that it can be bonded to the base polymer in process and thus permanently exists in the polymer material.

紫外线吸收剂的应用实例

Application examples of ultraviolet absorbents

1、由于聚合物的种类不同，使其劣化的紫外线波长也不相同，不同的紫外线吸收剂可吸收不同波长的紫外线，使用时，应根据聚合物的种类选择紫外线吸收剂。

1, because of the different kinds of polymers, the ultraviolet wavelengths of the degradation are different. Different ultraviolet absorbents can absorb the ultraviolet light of different wavelengths. When used, the UV Absorbents should be selected according to the type of polymer.

2、化妆品中使用的紫外线吸收剂，能够减少或者完全吸收紫外线，保护皮肤。但如果过量使用或者使用禁用的紫外线吸收剂，则以对皮肤形成刺激，引起皮肤过敏。

2. Ultraviolet absorbers used in cosmetics can reduce or completely absorb ultraviolet rays and protect the skin. However, excessive use or use of banned ultraviolet absorbents can stimulate skin and cause skin allergy.

水杨酸苯酯

Benzyl salicylate

成 分：邻羟基苯甲酸苯酯

Composition: benzoate phthalate

性能及用途：无色结晶粉末。具有令人愉快的芳香气味（冬青油气味）。密度1.250g/cm3，溶点43，沸点（1.6kPa）173。易溶于乙醚、苯和氯仿，溶于乙醇，几乎不溶于水和甘油。含量99%。

Properties and uses: colorless crystalline powder. It has a pleasant aroma (smell of Holly oil). Density 1.250g/cm3, melting point 43, boiling point (1.6kPa) 173. Soluble in ether, benzene and chloroform, soluble in ethanol, almost insoluble in water and glycerin. The content is 99%.

该品为一种紫外线吸收剂，用于塑料制品，但吸收波长范围较窄。美国食品药物管理局批准用于接触食品的丙烯酸树脂用品。

The product is an ultraviolet absorber for plastic products, but its absorption wavelength is narrow. The US Food and Drug Administration approved acrylic resins for food contact.

汽巴Chimassorb 81

Chimassorb 81

Chimassorb 81是二苯酮类紫外线吸收剂，与受阻胺类光稳定剂联合使用，可提供良好的光稳定化保护。与聚烯烃和软PVC相容性好。

Chimassorb 81 is a two benzophenone UV absorber, combined with hindered amine light stabilizers, which provides good light stability protection. It has good compatibility with polyolefin and soft PVC.

化学名称：2-羟基-4-辛氧基二苯甲酮

Chemical name: 2- hydroxyl -4- octyl two Benzophenone

化学结构：

Chemical structure:

应用：Chimassorb 81与受阻胺复配使用，主要应用于农膜中低密度，线性低密度聚乙烯以及EVA共聚物。也可作为紫外线屏蔽剂，保护工业用/民用包装中的内容物。另外，与受阻胺光稳定剂复合使用，可用于高密度聚乙烯模塑制品

Application: Chimassorb 81 is used in combination with hindered amine. It is mainly used in low density, linear low density polyethylene and EVA copolymer in agricultural film. It can also be used as a UV shielding agent to protect the contents of industrial / civil packaging. In addition, combined with hindered amine light stabilizer, it can be used in high density polyethylene molding products.