Production of light diffusion PC does not pay much attention to which programs

Production of light diffusion PC does not pay much attention to which programs

First, the choice of light diffusing agent and mixing process

It is well understood by those in the industry that light diffusing agents have a decisive influence on the effect of light-diffusing PCs and can affect the cost of light-diffusing PCs. Therefore, there is still some emphasis on the addition of silicone, the effect is better, but the process requirements are high, accidentally yellow; so many manufacturers use a single screw to do, but dispersion is a problem. At present, a newly developed light diffusing agent for PMMA microspheres can solve the problem of light diffusion PC yellowing to the greatest extent, and the price is low. In order to avoid yellowing, it is also necessary to consider the resin system, the stabilizer system and even the masking system.

Second, cleaning the machine is the key

The key to processing is that the machine needs to be cleaned very cleanly. Even if there is a mature formula, the machine is not cleaned, and the PC will turn yellow when it is slightly inadvertent. First pass the water through the machine, then use transparent particles to pass the machine until the cleaning is very clean. As for the diffusing agent, it is not so magical, and it is very popular now.

Third, the formula of light diffusion PC

The formulation of light-diffusing PCs is a secret of every company and is generally difficult to obtain. But everyone is no stranger to titanium dioxide, can you add titanium dioxide? There are several opinions on the Internet right now. Some people say that making light diffusion PC plus titanium dioxide is OK, there is nothing magical. It is also said that adding titanium dioxide will die straight. In fact, this is nothing to discuss, who knows who!

Fourth, the light transmittance is more than 85%

Now, for light-diffusing PCs, the light transmittance is required to reach 85%, and it must be weather-resistant. Many domestic factories claim to be able to achieve them. In fact, they have never been tested. For lighting factories that focus on quality and brand, we must choose a powerful light diffusion PC manufacturer to cooperate!

Generally, the optical performance quality control of transparent and translucent plastics such as plates, sheets, films, and tubes is mainly evaluated by tests such as transmittance and haze. China was proposed by the former Ministry of Chemical Industry of the People's Republic of China, the former Ministry of Chemical Industry Chenguang Chemical Research Institute and other units were drafted and issued by the State Administration of Standards. On September 1, 1981, a transparent plastic transmittance and haze test method was implemented. 》. It is defined as follows:

1. Transmittance—The ratio of Luminous Flux through the sample to the luminous flux incident on the sample, expressed as a percentage.

2. Haze—the ratio of the scattered light flux to the transmitted light flux that is deflected from the direction of the incident light through the sample, expressed as a percentage (for this method, only the scattered light flux that is more than 2.5 degrees from the direction of the incident light is used to calculate the haze) . A cloudy or turbid appearance of the interior or surface of a transparent or translucent material due to light scattering. Expressed as a percentage of the ratio of the scattered luminous flux to the luminous flux of the transmissive material. It is an important parameter for the optical transparency of transparent or translucent materials.

This method can be used to control certain optical properties of products and research products. Transparency and haze can be compared only when the transparent plastic is at the same thickness. Haze and light transmission are two different concepts.

Both light transmittance and haze are important indicators for measuring the transparency of materials. Generally speaking, there is an inverse relationship between light transmittance and haze, that is, materials with high light transmittance have low haze and vice versa.

However, the material with a large haze may also have a low light transmittance. This is the case with light diffusing materials and light diffusing parts. With the popularity of LED light sources and LED lighting, its application is showing rapid growth. If such a material is used as the window glass, the room in the daytime is very bright, but it is even and soft, and at the same time has concealment and privacy; if the light diffusing material is used for the LED lighting lamp and the lampshade, high light transmission is required. At the same time, it can make the glare LED light source even, soft, beautiful, and can not see the internal lamp beads.

Therefore, as a light diffuser (Light Diffuser and/or Optical Diffusing Agent), the real challenge is to obtain a smooth, uniform, and soft effect while ensuring sufficient light transmittance, both of which can be satisfied. Can be a good light diffusing agent.

Based on the above basic concepts and principles, the evaluation of the merits of a light diffusing agent is based on the fact that the light diffusing agent minimizes light attenuation during the process of efficiently performing light diffusion.

Measures and factors for controlling and minimizing light decay include: refractive index of the material of the light diffusing agent itself, refractive index difference with the transparent phase of the continuous phase, microscopic regularity of the light diffusing agent, sphericity, smoothness of the surface, particle size Uniformity of particle size distribution, heterogeneous dispersion uniformity, thermal stability, purity, and the like.

Silicone spherical powder (for example: KMP-590, etc. from Shin-Etsu, Japan) has performed well in all aspects mentioned above. As a new generation of high-efficiency organic light diffusing agent, LED lamp , lampshade, LCD display backlight module Applications in the field of materials and light diffusion films are becoming more and more widespread.