Why can PC lampshade crack

Many LED fluorescent lamp manufacturers in the production process, and fluorescent lamp aging in the process of use there will be cracks. Now I will analyze the cause of this crack. For your reference.

PC material originally for polymer, its toughness is often good, in the normal range of material characteristics, the proportion of PC molecule cracking is less, that is to say, the cracking phenomenon of PC material is smaller. So why now the PC lampshade will appear to have cracking? The main reason is that the structure of PC molecular chain is damaged and the molecular chain is disconnected. Resulting in product cracking or surface cracks. The factors affecting the structure of molecular chains are as follows:

1: Environmental factors.

Acid and alkaline environment, strong ultraviolet, the influence of high and low temperature (please refer to the specific PC material use environmental characteristics table), so in the process of use, especially to pay attention to the impact of the environment.

2: The effect of stress

The stress effect is divided into two kinds, one, the shape of the product itself and the size of the mold itself design and the stress produced by demoulding. Second, the external stress on the product.

So in the product design, the stress brought by the structure will directly affect the product. This should in a long time of self-action will have a destructive effect on the molecular chain, so the surface cracking is also appeared.

Let alone external applications, as long as the external stress is greater than the energy of the product chain can withstand, fracture will occur.

3: The use of secondary materials.

The product is repeatedly produced and used under the action of constant high temperature, the molecules of the product will undergo fission. The chain breaks and cracks. From high score material to low score material, material becomes brittle.

4: Use of material fillers.

PC itself is a polymer, molecules linked into a network of elastic structures. If the use of fillers or the size of the molecular weight filled does not match. So the elastic mesh structure of PC is filled with other molecular structure material. Thus the toughness of the product is destroyed. The interactions between the molecules become less intense, resulting in a split. Or the molecular weight of the filler does not match the PC itself, then the bonding part between the surface of the filler molecule and the PC molecule will be uneven. The surface of the whole product looks poor gloss, there will be concave and convex surface, so that the surface tension of the whole product surface will be unbalanced. (This point is fully reflected in the use of PC diffuser, the same product, the use of a material is PC diffuser, one is PC transparent material with diffuser filled after production, the two materials produced by the product start from the appearance or, the effect is similar, but a little longer in 1 year or so, the effect is obviously changed . The material with the diffuser turned yellow significantly. And cracks begin to appear on the surface of the material).

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