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How to solve the blisters of transparent barium sulfate masterbatch?
- 2020-02-10-

How to solve the blisters of transparent barium sulfate masterbatch?

High-gloss barium sulfate precipitated barium sulfate manufacturer synthetic barium sulfate ultrafine barium sulfate nano barium sulfate modified barium sulfate surface treatment barium sulfate transparent blown film masterbatch blown film filling masterbatch transparent barium sulfate

Nano-barium sulfate transparent masterbatch is an environmentally-friendly and economical masterbatch. It is prepared by using polyethylene as a carrier resin, adding nano-level barium sulfate powder and additives, through high-temperature mixing, plasticizing, granulating, and cooling. Add this masterbatch during the blown film processing of HDPE, LDPE, LLDPE, etc.:

Adding within 20% does not basically affect the transparency of the film;

Can reduce the production cost of the film;

Improve the mechanical strength and rigidity of the film;

The development trend of nano barium sulfate masterbatch is that downstream customers require more and more transparency, which requires that the particle size of nano barium sulfate powder is getting smaller and higher and the purity is higher, but currently only two or three companies are doing good quality; in order to achieve Nano barium sulfate powder does not reunite, and various manufacturers have racked their brains to develop their own unique surface treatment technology.

How to solve the blisters of transparent barium sulfate masterbatch?

Because the price of resin has been falling all the way, and there is still a downward trend, the market for barium sulfate masterbatches is bleak, so the quality requirements for barium sulfate masterbatches are further improved. Past experience has not been able to meet the actual requirements. All know that barium sulfate masterbatches The profit is high and I want to do it, but due to insufficient knowledge of barium sulfate powder, most manufacturers are not doing well.

At present, there are various equipment combinations for making barium sulfate. No matter what machine combination is used, it is difficult to add more than 30% of the filler masterbatch. Some add more than 20%, and there will be blisters, which can exceed 40% Even 50%, most of them are exaggerated.

Reasons for not doing well:

It is difficult to have pure barium sulfate ore and raw materials are difficult to control. Most powder manufacturers use ground barium carbonate powder and sulfuric acid to prepare barium sulfate powder; such barium powder has disadvantages such as insufficient particle size, agglomeration, and excessive water content. These are precisely the fatal and difficult problems for downstream masterbatch manufacturers.

Barium sulfate powder is hexagonal crystal type. The water in the middle is extremely difficult to deal with. The adsorption force generated by the water makes the powder agglomerate and is difficult to break up. Barium sulfate powder manufacturers use additives to cover the powder and part of the water. inside;

If the shear force of the high-speed mixer is not enough, it will be difficult to break up agglomerates, let alone treat water. This is also the reason why many manufacturers use high-speed mixers to negate high-speed mixers. Professionally designed and scientific blades, baffles, motors, etc. are required to accelerate the impact speed of the powder in the mixer, increase the number of impacts, and increase the impact strength, etc., effectively break up agglomerates, treat water powder, and surface modification treatment. This is the key to the quality of barium sulfate masterbatch.

How to solve the blisters of transparent barium sulfate masterbatch?

Nano-scale barium sulfate powder does not exist in the original ecological form, most of which exist in the form of grape bunches. If nano-scale polymer surface treatment agent is not used, it is difficult to achieve a perfect dispersion effect. Secondly, when the shear force of a high-speed mixer increases After meeting the requirements of powder treatment and modification, it will inevitably lead to problems such as rapid temperature rise and high temperature. This needs to test the temperature resistance of the surface treatment dispersant, if the temperature is not enough, it will inevitably produce yellowing, which will affect the product quality.

Barium sulfate powder is highly viscous and the twin-screw machine has dead corners, which is not conducive to product stability. It is necessary to use a compact kneader to better plasticize. Theoretically, the dense kneading machine is more conducive to plasticization. In fact, the barium sulfate masterbatch manufacturers that do a good job use the dense kneading machine.

Many manufacturers use barium sulfate powder with several thousand meshes. Some say that it can be done with a screw machine, and some say that it can be done without a high agitator. I think they are all right. The key depends on their quality positioning. But if you want to make a unique and competitive product, or to have an overwhelming advantage in product quality, several conditions are indispensable:

1. Nano-scale barium sulfate powder (12000 mesh), with a purity of over 98%.