Silicon dioxide anti-blockmasterbatch

Product application

Polyolefin plastic film is widely used in a number of industry packaging films due to its various advantages,such as light weight, good transparency, small water absorption,good air tightness, abrasion resistance, easy for color printing and soft handfeel But in the production and application process,interlayer bonding often occurs, so that the film is difficult to open, affecting the packaging efficiency. In order to reduce the bonding between film layers, we usually add some additives in early stage of film processing to resist the bonding between film layers, so that the film will be easy to open. Given describedabove, the anti-blocking agent, specifically for improving film opening performance emerges at the right moment.

As early as 1950s, the United States had a product specifically designed for anti-bonding between polyethylene films. Through half a century of development, the anti-blocking agent has achieved great progress, including multiple series of products in organic and inorganic categories，providing various selections for the improvement of film opening performance for polyolefin films. So far, almost all of plastic films are using the anti-blocking agent. But at the same time we should also be aware of that the use of additives, inevitably affect the optical, electrical, surfaceand other performance of plastic films. Different types ofanti-blocking agents have different effects, or further speaking,quality of the anti-blocking agent affect the application performance of plastic films.

Present situation，advantages anddisadvantages of anti-blocking agent

Anti-blocking agent includes: organic anti-blocking agent, inorganic anti-blocking agent and synthetic inorganic anti-blocking agent.Oleamide(Organic),Erucamide (organic),Silicon dioxide (inorganic)Aluminum silicate (synthetic inorganic).

Organic film anti-blocking agent

Organic anti-blocking agent mainly includes oleamide and erucamide. The role of organic anti-blocking agent is that the anti-blocking agent migrates to the film surface, and its non-polar end twines with high polymer, while the polar end forms a smooth membrane on the surface for lubrication.

But the melting points of most anti-blocking agents are low, and the amount added in the resin cannot be too large, or otherwise it will seriously affect the film performance. In addition, organic anti-blocking agents are mostly unstable in the resin, and a large amount of anti-blocking agents may separate out in actual application, affecting the printing quality of the film, and meanwhile the precipiation of anti-blocking agent will affect the quality of the packaged. This kind of film cannot be used for the packages of food, influencing the application and yield of films.

Inorganic film anti-blocking agent

Inorganic anti-blocking agent mainly refers the anti-blocking agent produced by natural ore crushed to a certain particle size.The anti-blocking principle of inorganic anti-blocking agent(including synthetic type) is that:the film surface can be raised,so that the air can permeate and reduce the negative pressure between films. On the other hand, due to the increase of the film surface roughness and permeation of the air, the contact surface between films is reduced and the friction force is reduced.

The inorganic anti-blocking agent is a good solution to the application of the fim after added the anti-blocking agent, and especially the printing performance has been significantly improved. At present, the industrial used inorganic anti-blocking agent is still of large particles, which is difficult to disperse. And also it is easy to form fisheye and splay mark in the process of film blowing or film pulling, and the impact of inorganic anti-blocking agent on the performance of the filling system isalso significant.

Aluminum silicate synthetic inorganic filmanti-blocking agent

In recent years, the size of developed crystal synthetic inorganic anti-blocking agent is controlled well, with uniform particles, and especially the synthetic anti-blocking agent has a certain amount of micropore, which is able to embed part of polymer exposed molecular head to some extent, forming a macro-nucleation center in the polymer. Therefore, this kind of anti-blocking agent plays a good role in anti-blocking, and meanwhile the influence on the film performance is small.

Product features

Non-toxic, No harm, High transparency, Good dispersion, Goodgloss,Good color.