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How to solve the blisters of transparent barium sulfate masterbatch?
- 2019-09-24-


Tongming masterbatch is an environmentally-friendly and economical masterbatch. It is made of polyethylene and other carrier resins, adding nano-grade barium sulfate powder and additives, and mixing it at high temperature, plasticizing, granulating, and cooling. Add this masterbatch during HDPE, LDPE, LLDPE and other blown film processing:

Adding less than 20% does not affect the transparency of the film at all;

◆ Can reduce the production cost of film;

Improve the mechanical strength and rigidity of the film;

The development trend of nano-barium sulfate masterbatch is that the downstream customers' requirements are becoming more and more transparent, which requires the particle size of nano-barium sulfate powder to be smaller and higher, but the quality is currently only two or three; Nano-barium sulfate powders do not meet, and various manufacturers have gone to great lengths to develop their own unique surface treatment technology.

How to deal with blisters of Tongming barium sulfate masterbatch?

Because resin prices have fallen all the way, and there is a continuous downward trend, leading to a bleak barium sulfate masterbatch market, so the quality requirements for barium sulfate masterbatch have been further improved. Past experience can no longer satisfy the realistic requirements. Grain profit is high, I want to do it, but because the knowledge of barium sulfate powder is not good, most manufacturers do not do well.

At present, there are various combinations of equipment for making barium sulfate. No matter what machine combination is used, it is difficult to add more than 30% of filler masterbatch. Some add more than 20% to start blisters, which can exceed 40%. Even 50% 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 defects such as small particle size, gathering, and excessive water content. These are precisely the problems that the downstream masterbatch manufacturers are killed and difficult to handle.

Barium sulfate powder is hexagonal crystalline, and the central water is extremely difficult to handle. The adsorption force generated by the water makes the powder gathering and it is difficult to disperse. The manufacturers of barium sulfate powder use the auxiliary agent to cover the powder while also covering part of the water. inside;

If the high-speed mixer does not work well, it will be difficult to break up the party, let alone handle water. This is also the reason why many manufacturers use high-speed mixers to do poorly and reject high-agitators. Need to professionally design scientific paddles, baffles, motors, etc. to accelerate the impact speed of the powder in the mixer, increase the number of impacts, increase the impact strength, etc., effectively break up the party, handle gouache, and modify the appearance . This is the key to the quality of barium sulfate masterbatch.

How to deal with blisters of Tongming barium sulfate masterbatch?

Nano-sized barium sulfate powder does not exist in the original ecological form, and most of them exist in the form of grape bunches. It is difficult to achieve perfect dispersion without the nano-scale polymer surface treatment agent. Second, when the high-speed mixing machine shear force Increasing to meet the requirements for powder treatment and modification will definitely lead to problems such as rapid temperature rise and high temperature. This requires testing the degree of temperature resistance of the surface treatment dispersant. If the temperature resistance is not met, yellowing will occur and affect the product quality.

Barium sulphate powder has high viscosity, and the twin screw machine has dead angles, which is not conducive to the stability of the product. A compaction machine must be used to better plasticize. Theoretically, the compaction machine is more conducive to plasticizing. In fact, well-made barium sulfate masterbatch manufacturers use compaction machines.

Many manufacturers use thousands of mesh barium sulfate powder, some say it can be done with screw machine, some say it can be done without high stirrer, I think it's all right, it depends on the positioning of quality. But if you want to make a unique and competitive product, or if you want an overwhelming advantage in product quality, several conditions are indispensable:

1. Nano-sized barium sulfate powder (12000 mesh), purity is above 98%.