Pregelatinized starch is a way of deep processing of ordinary starch. It is expanded by extrusion, heating, and then crushed. The starch obtained in this way is called pregelatinized starch, also known as alpha starch (α-starch) (a-starch). Ordinary starch needs to be pregelatinized and heated to reach a paste state. Pregelatinized starch can form a paste by adding cold water, so there is no need to heat and gelatinize it when using it.
1. Appearance: white or off-white powder.
2. Particle size: 100 mesh pass rate greater than 98.5%; 80 mesh pass rate 100%. Special specifications of particle size 40 to 60 mesh.
3. Carbonization temperature: 280-300℃.
The main functions of pregelatinized starch are thickening, viscosity, bonding, solution thickening, good water solubility, suspension or stability with glue, protective colloid effect, film-forming, water retention, bonding performance, non-toxic, tasteless, biocompatible, thixotropic, etc.
Another feature is environmental protection. In today's society, environmental protection is the top priority for human survival and development. Any enterprise and any product must develop in the direction of environmental protection. Starch is an organic matter that is edible and degradable. Therefore, it is usually used as an environmentally friendly adhesive in industry.
1. Construction industry: As a water retainer and retarder for cement mortar, it makes the mortar pumpable. As an adhesive in plaster, gypsum, putty powder or other building materials, it improves the spreadability and prolongs the operability time. It is used as a bonding enhancer for pasting tiles, marble, plastic decorations, and can also reduce the amount of cement. The water retention property of HPMC prevents the slurry from cracking due to drying too quickly after application, and enhances the strength after hardening.
2. Ceramic manufacturing industry: It is widely used as an adhesive in the manufacture of ceramic products.
3. Paint industry: As a thickener, dispersant and stabilizer in the paint industry, it has good compatibility in water or organic solvents. As a paint stripper.
4. Ink printing: As a thickener, dispersant and stabilizer in the ink industry, it has good compatibility in water or organic solvents.
5. Plastics: As a molding release agent, softener, lubricant, etc.
6. Polyvinyl chloride: As a dispersant in the production of polyvinyl chloride, it is the main auxiliary agent for the preparation of PVC by suspension polymerization.
7. Others: This product is also widely used in leather, paper products, fruit and vegetable preservation and textile industries.
8. Pharmaceutical industry: coating materials; membrane materials; rate-controlling polymer materials for sustained-release preparations; stabilizers; suspending agents; tablet adhesives; viscosity enhancers.