Super fine powder refining process and equipment

The problem of the particle size of starch in the preparation of conventional starch-based biodegradable plastics seems to have been bothering us. Due to the large particle size of native starch, it brings a series of problems, such as the inability to blow high-starch content and relatively thin thickness of the degradable film, the film's strength is not enough, the film surface feels rough, and the compatibilizer is expensive. and many more. In order to solve this problem, the current degradable plastics company adopts the usual method - pre-gelatinization, and the twin-screw combination of threads enhances cutting. Improve the formula so that the starch breaks when mixing. However, this has caused some new problems such as low production efficiency, poor process control, and high production costs. These reasons are also one of the reasons why starch-based biodegradable plastics are not easily popularized.

Normal > After years of painstaking research. And the actual operation, the use of German technology cooperation in the production of superfine powder refiner, with the self-developed starch cross-linking modified new technology, so that refined modified starch to achieve the following technical performance: 1. Starch particle size can be achieved by 6 Micron (2000 mesh) and narrow particle size distribution (see chart particle size distribution table); 2. Starch water content can be reduced to 5% for large extrusion granulation conditions; 3. Surface energy changes due to cross-linking on starch surface The oleophilicity of the starch is increased, and the compatibility with the plastic resin is greatly enhanced; 4. The phenomenon of no reunion is checked after several months of storage and the starch dispersion is good. Under the microscope, the starch in the PE film with 30% starch content was distributed in a uniform state and the interface was in good condition. 5. Due to the large amount of starch and good dispersibility, the starch was degraded during the biodegradation and left behind. The voids are several orders of magnitude larger than the addition of plain starch, resulting in an increase in surface area that makes PE more susceptible to oxidative degradation.

Normal > Particle size: 500 ~ 2500 mesh adjustable

Normal > Production: 500~2500kg/hour

Normal > Refinement: starch, calcium carbonate, talc, wood flour

Normal >Detailed cost: <500 yuan/ton (including depreciation of artificial hydropower and equipment)

Normal > The current price of 400 mesh ultrafine starch is about 3,000 yuan/ton, and the price of 1500 mesh ultrafine calcium carbonate is about 1,200 yuan/ton. Taking calcium carbonate as an example, the cost of self-refining ultra-fine calcium carbonate 1500 is 500 yuan/ton (purchase of 325 mesh calcium carbonate powder is self-refined), which can greatly reduce production costs. At the same time, ultrafine powders produced by this technology can also be widely used in other industries such as paper/textile/medicine/cosmetics/coatings.

Normal >