49 results about "HYDROPHOBIC STARCH" patented technology

The invention relates to starch-base degradable bioplastic and a preparing method thereof, and belongs to the technical field of biodegradable materials. The starch-base degradable bioplastic is prepared from 40-85% of commodity polymer plastic, 10-50% of a high-hydrophobicity starchiness material, 0.5-5% of aliphatic polyester and 0.1-5.5% of oxidation accelerator. The preparing method of the starch-base degradable bioplastic includes the following steps that starch is treated in a hydrophobization mode to obtain the high-hydrophobicity starchiness material, the raw material components are mixed by a ratio and prepared into master batch through a twin-screw extrusion machine, and after the master batch and the commodity polymer plastic are mixed, the starch-base degradable bioplastic is prepared through injection molding, flattening, blow molding, vacuumizing and forming. The product prepared through the method can be used repeatedly on the dry condition without perpendicular sunlight incidence, the strength is kept unchanged basically, an abandoned product is completely decomposed finally in wet soil, no harmful component is generated, and the environment is not polluted.

The present invention relates to a microencapsulate comprising microcapsules having a diameter of 0.1 μm to 25 μm, said microcapsules comprising: —a core particle having a diameter of 90 nm to 23 μm and containing at least 3% of the active component by weight of said core particle; and—a coating that fully envelops the core particle and containing at least 20 wt. % of a hydrophobic polymer selected from cellulosic ethers, cellulosic esters, zein, shellac, gluten, polylactide, hydrophobic starch derivatives, polyvinyl acetate polymers, polymers or copolymers derived from an acrylic acid ester and / or a methacrylic acid ester and combinations thereof; wherein the core particle contains a release trigger component and / or the coating contains a release trigger component, said release trigger component being selected from: —a water-swellable polymer having a water-uptake capacity at 37° C. and pH 7.0 of less than 20 wt. % and a water-uptake capacity at 37° C. and pH 2.0 of at least 50 wt. %; and—an edible salt having a water solubility at 37° C. and a pH of 7.0 of less than 1 mg / ml and a water solubility at 37° C. and a pH of 2.0 of at least 5 mg / ml; The microencapsulate of the present invention does not release the encapsulated active component when incorporated in water-containing foodstuffs, beverages, nutritional compositions or pharmaceutical compositions. Following ingestion, however, the active component is released rapidly.

The invention provides a preparation method for hydrophobic starch calcium; the preparation method comprises the following steps: 1) carrying out constant temperature stirring of native starch, modified starch or starch derivatives and water at a 25 DEG C-40 DEG C reaction system to form a 30-40 wt.% starch emulsion; 2) in the 25 DEG C-40 DEG C reaction system, adjusting the pH value of the emulsion to 7.5-8.5 with an alkaline solution; 3) in the 25 DEG C-40 DEG C reaction system, adding anhydride; and constantly adding an alkaline solution or a calcium salt to maintain the pH value of the emulsion at 7.5-8.5, and continuing to carry out a reaction for a certain time; 4) in the 25 DEG C-40 DEG C reaction system, adding an acid to adjust the pH value to 6.0; and 5) adding water, washing and filtering, drying at the temperature of 50 DEG C, crushing, and sieving to obtain white hydrophobic starch calcium. The hydrophobic starch calcium product belongs to adsorbent modified starch, has the advantages of good fluidity, good hydrophobicity and good safety, is an excellent adsorbent, and can be widely applied in cold spray products, such as adsorbents, talcum powders, prickly-heat powders and other skin-care products.