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How to deal with blisters in transparent barium sulfate masterbatch
- 2021-01-12-

Transparent masterbatch is an environmentally-friendly and economical masterbatch. It is prepared by mixing polyethylene and other carrier resins with nano-scale barium sulfate powder and additives through high temperature mixing, plasticization, granulation and cooling. Add this masterbatch during the blown film processing of HDPE, LDPE, LLDPE, etc.:

◆Increase within 20% will not affect the transparency of the film at all;

◆It 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 smaller and the purity is higher, but now only two or three companies are required to make good quality; To realize the non-assembly of nano barium sulfate powder, each manufacturer has also worked hard to develop its own unique surface treatment skills.

How to deal with 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. The past experience can no longer meet the actual requirements. All know that barium sulfate Masterbatch is highly profitable, and I want to do it, but because of the inability to understand barium sulfate powder, most manufacturers are not ambitions.

Nowadays, there are various equipment combinations for making barium sulfate. No matter what machine combination is used, it is difficult to increase the amount of filler masterbatch to exceed 30%. Some increase amount exceeds 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 the 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 the disadvantages of not being fine in particle size, gathering, and excessive water content. These are precisely the problems that the downstream masterbatch manufacturers have lost and are difficult to deal with.

Barium sulfate powder is hexagonal crystal type. The center water is extremely difficult to handle. The adsorption force generated by the moisture makes the powder assemble and it is difficult to break up. Barium sulfate powder manufacturers use additives to load the powder together with some water. inside;

If the shearing force of the high-speed mixer is not available, it will be difficult to break up the assembly, let alone treat the water. This is also the reason why many manufacturers use high-speed mixers to make it difficult to deny high-speed mixers. Professionally designed and scientific blades, baffles, motors, etc. are required to speed up the impact of the powder in the mixer, increase the number of impacts, increase the impact, etc., and effectively break up the assembly, treat the water powder, and modify the surface. Sexual treatment. This is the key to the quality of barium sulfate masterbatch.

How to deal with the blisters of transparent barium sulfate masterbatch?

Nano-scale barium sulfate powder does not exist in the original ecological way, most of it exists in the form of grape bunches. If the nano-scale polymer surface treatment agent is not used, it is difficult to achieve a perfect dispersion effect. Secondly, when the shear force of the high-speed mixer increases After meeting the requirements of powder processing and modification, it will inevitably lead to problems such as rapid heating and high temperature. This requires testing the temperature resistance of the surface treatment dispersant. Those that cannot withstand temperature will inevitably turn yellow and affect product quality.

Barium sulfate powder is highly viscous, and the twin-screw machine has dead corners, which is not conducive to the stability of the product. It is necessary to use a compaction machine 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 thousands of barium sulfate powders, some say that they can also be made with screw machines, and some say that they can be made without high-speed mixers. I think they are all right. The key depends on their quality positioning. But if you want to make a competitive product, or if you want an overwhelming advantage in product quality, several conditions are indispensable:

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