保定消光粉厂

如何选择二氧化硅消光剂

How to choose silicon dioxide extinction agent

消光剂顾名思义加入可以起到消光作用。虽然许多东西都可以用作消光剂，如滑石粉、天然的二氧化硅、微粉蜡等，但这些均存在若干致命的缺陷。

As the name implies, the addition of matting agent can play a role in extinction. Although many things can be used as matting agents, such as talcum powder, natural silicon dioxide and micropowder wax, there are some fatal defects.

目前最常用的消光剂是合成微粉化二氧化硅，尤以凝胶法二氧化硅为主。（山西天一纳米材料科技有限公司是专业从事二氧化硅气凝胶的制造和研发，）这是由于凝胶法二氧化硅具有高效消光性，极佳的透明度和易分散性，对漆膜的其它性能影响小。    选择合适的消光剂由许多因素所决定。如干膜性质，就要求透 明度、漆膜爽滑、抗刮性和耐侯性。再如应用特性，如粘度、抗沉性、再分散程度和光泽一致性等。在涂料加工过程中，抗过度研磨、分散的好坏，也要认真对待。

At present, the most commonly used matting agent is the synthesis of micronized silica, especially gel based silica. (Shanxi Tianyi Mstar Technology Ltd is specialized in the manufacture and development of silica aerogels.) this is due to the high efficiency and extinction of silica gel, excellent transparency and dispersity, and small impact on other properties of the film. The choice of appropriate matting agent is determined by many factors. Such as dry film properties, requires transparency, film slippery, scratch resistance and weather resistance. Such as viscosity, anti sinking property, degree of redispersion and consistency of gloss. In the process of coating processing, the quality of anti excessive grinding and dispersion should also be taken seriously.

一、不同性能要求下对消光剂的选择

Selection of extinction agents for different performance requirements

1、理想的消光效率

1, ideal extinction efficiency

1）选择平均粒径较大的产品。消光剂的平均粒径越大，消光效率就越高。但如颗粒太大了，会导致漆膜表面太粗糙，影响手感和外观。

1) select the products with larger average particle size. The larger the average particle size of the matting agent, the higher the extinction efficiency. However, if the particles are too large, the surface of the paint film will be too rough, which will affect the feel and appearance.

2）选择孔隙率（孔容）较高的产品。孔隙率越大，单位重量粉料含量就会越高，消光性能就越好。

2) select a higher porosity (Kong Rong) product. The greater the porosity, the higher the powder content per unit weight and the better the extinction performance.

2、理想的透明性

2, ideal transparency

1）选择平均粒径较小的产品。配方中同等添加量的情况下，消光剂的平均粒径越小，漆膜的透明性就越好，但相应消光效率也会降低，需要指出的是细粉含量太高，对透明度会产生负面影响。

1) select the products with smaller average particle size. In the case of the same dosage in the formula, the smaller the average particle size of the extinction agent is, the better the transparency of the film is, but the corresponding extinction efficiency will be reduced. It is necessary to point out that the fine powder content is too high and will have a negative effect on the transparency.

2）表面处理。由于消光粉表面处理的类型不同，会影响其与基料的润湿分散性，从而会影响到漆膜的透明性。因此需要调整消光粉与基料之间的匹配性，必要时可通过添加润湿分散助剂来改善。同时还需注意是否有其他导致漆膜透明性变差的因素，如相容性较差的助剂或者差的颜料等。

2) surface treatment. Because of the different types of surface finish, the wetting and dispersibility of the matting powder will affect the transparency of the film. Therefore, it is necessary to adjust the matching between the matting powder and the base material, and if necessary, add wetting and dispersing auxiliaries to improve it. At the same time, we should pay attention to other factors such as poor compatibility of auxiliaries or poor pigments.

3、理想的爽滑效果

3. Ideal smoothness

1）通常表面经过有机处理的消光剂，手感会比没有经过处理的好一些。

1) the surface matting agent which is usually treated by organic surface will feel better than that without treatment.

2）粒子大小及粒径分布。一般来说，颗粒越细的消光剂，在漆膜当中的手感越细腻。粒径分布越窄，大颗粒越少，手感一定程度上要好些。

2) particle size and particle size distribution. Generally speaking, the thinner the finer particles, the more delicate the feel of the film is. The narrower the particle size distribution is, the smaller the particle size is and the better the handle is to a certain extent.

4、理想的悬浮性  一般来说，消光剂随着涂料存放时间的延长，都会在一定程度上出现分层与沉淀，表面经过有机处理的产品防沉性能会好一些。因此配方设计时，应考虑如何避免消光粉的沉淀问题，填加适当的防沉助剂。

4. Generally speaking, with the prolongation of the storage time of the coating, the delamination and precipitation will appear to a certain extent, and the anti sinking performance of the surface after the organic treatment will be better. Therefore, in the formulation design, we should consider how to avoid the precipitation problem of the matting powder and fill in the appropriate anti precipitation auxiliary.

5、理想的表面抗刮、耐磨性  消光剂表面进行有机处理过的，会对漆膜的表面抗刮伤性及耐磨性有一定的改善

5. The ideal surface scratch resistance and wear resistance matting agent will improve the scratch resistance and wear resistance of the film surface.

二、不同体系涂料对消光剂的选择

Two, selection of different system coatings for extinction

1、溶剂型涂料

1. Solvent coating

1）在透明清漆中，消光剂的加入不能在贮存时产生硬沉淀，也不能影响最终漆膜的透明度。因此，正如上面所提到的，有机物处理的消光剂是最佳的选择。用有机物处理的消光剂还可以带来另外一些好处，如表面滑爽、抗擦伤性增强等。

1) in transparent varnish, the addition of matting agent can not produce hard precipitation during storage, nor affect the transparency of the final film. Therefore, as mentioned above, organic finishing matting agent is the best choice. Organic matting agents can also bring other benefits, such as surface smoothness and abrasion resistance.

2）在色漆体系中，由于有颜料的加入，颜料的比重比消光剂大得多，所以消光剂的沉淀不是问题。出于节省成本的考虑，可以选用无表面处理的消光剂，但有时，为了改善漆膜的手感和抗擦伤性，也可以选用有机处理的消光剂。  在溶剂型体系中，消光剂的粒径要根据涂料体系的干膜厚度和所需的漆膜表面性质，比较细的消光剂会使漆膜表面比较平滑，手感较好，但其消光效率不如较粗的消光剂。而闭孔式木器漆，手感要求较高，所以要选用较细的消光剂。  消光剂的添加量取决于树脂体系，固体含量、干膜厚度、消光剂的型号、干燥方法和所要求的光泽度。需选择最佳消光剂和计算所需用量，绘制出所考虑的涂料体系在近似实际使用条件下的消光曲线。

2) in the paint system, because of the addition of pigment, the specific gravity of pigment is much larger than that of the matting agent, so the deposition of matting agent is not a problem. In order to save cost, no surface treatment can be used, but sometimes, in order to improve the hand feeling and abrasion resistance of the film, the organic treatment can also be used. In the solvent system, the particle size of the extinction agent should be based on the thickness of the dry film of the coating system and the required surface properties of the paint film. The fine extinction agent will make the surface of the film smooth and better, but its extinction efficiency is not as good as that of the coarser. The closed hole wood paint has a higher hand feel, so we need to use a smaller matting agent. The amount of matting agent depends on the resin system, solid content, dry film thickness, the type of matting agent, drying method and the required gloss. It is necessary to select the best matting agent and calculate the required dosage, and draw out the extinction curve of the coating system under the approximate practical conditions.

2、水性涂料体系  随着环保问题的日益突出，传统的溶剂型涂料正在逐渐被一些环保型涂料所取代，水性涂料，特别是用于木器的水性涂料的发展，对二氧化硅消光剂的需求也越来越多。传统的消光剂虽然可以对水性涂料进行消光，但存在许多弊端。水性涂料体系粘度较低，因此要求消光剂对其体系尽可能小地影响，即二氧化硅吸油量尽可能地小，同时也必须有利于在水性体系中分散。

2. With the increasingly prominent environmental protection problems, the traditional solvent coatings are gradually replaced by some environmentally friendly coatings. The development of water-based coatings, especially the water-based coatings used in wood, is more and more demand for silicon dioxide. Although the traditional matting agent can eliminate light from waterborne coatings, there are many disadvantages. The viscosity of the water based coating system is low, so the extinction agent is required to influence the system as small as possible, that is, the amount of silicon dioxide oil absorption is as small as possible, and it must also be beneficial to dispersing in the water system.