47results about How to "Control mechanical strength" patented technology

Preparation of sponge-like porous materials of silk protein is carried out by converting its conformation with denaturant at low temperature to have frozen phase separation to obtain the product. Its parameters can be regulated by controlling concentration of the silk protein, amount of denaturant or its characteristics, freezing time or post-treatment in porosity, pore size, and mechanical performance. Neither cross-linker nor pore-generating agent nor surfactant nor organic solvent with strong toxicity is used. It is produced in a simple process, and has a uniform texture, high porosity up to 98%, good toughness and elasticity and reliability, water absorbing rate up to 5000%, elastic recovery rate 100% and press deformation >90%.

The invention discloses a micro-capsule essence with two-layer capsule walls and a preparation method and an application thereof. The essence comprises inner oil essence, a first micro-capsule wall in the middle and an outer capsule wall located on outermost layer. The micro-capsule essence with two-layer capsule wall of the invention has two-layer capsule wall structure , good mechanical strength and flexibitity; in addition, when used in cloth the micro-capsule essence has the advantage of strong washing resistance, long fragrance holding time and easy storage. The preparation method of themicro-capsule essence with two-layer capsule walls adopts complex coacervation phase separation method to prepare the essence, the technological design is seasonable, the maneuverability is strong, micro-capsule essence with different fragrances can be designed according to different demands; in the preparation process, the mechanical strength of the micro-capsule essence can be effectively controlled so as to control the duration time and degree of the frangrance of the micro-capsule essence; in addition, the finished product of the micro-capsule essence with two-layer capsule walls preparedin the invention has high qualification rate and the micro-capsule essence with two-layer capsule can realize industrialized production.

The invention provides a controlled release coating material containing polymer micro nanoparticles. The controlled release coating material comprises the following components: ethylene-vinyl acetate copolymerization polymer and a blending polymer alloy thereof; polyvinylpyrrolidone and complex microelements and drug thereof; and polymer micro nanoparticles. The controlled release coating material containing the polymer micro nanoparticles is adjustable in chemical structure and has good film-forming property and degradability; by adding the polymer micro nanoparticles with uniform particle size, the porosity and controlled release property of coating can be regulated; besides, by loading specific active substances in a chemical bonding manner, multi-functionalization of controlled-release fertilizer is realized. The controlled release coating material containing the polymer micro nanoparticles can be taken as a coating of an agricultural controlled release fertilizer and can be also taken as a pesticide controlled release coating and coatings of other medical products.

The invention provides a large area nitrogen-doped carbon nano-tube paper preparation method, which comprises: (1) weighing ferrocene powder, dissolving in dichlorobenzene to form a ferrocene / dichlorobenzene carbon source solution, weighing pyridine, and mixing the pyridine and the ferrocene / dichlorobenzene carbon source solution to form a ferrocene / dichlorobenzene / pyridine mixing carbon source solution; 2) coiling an iron sheet or copper sheet substrate into a cylindrical material, placing into the quartz reaction chamber of a reaction furnace, sealing the reaction chamber, introducing argon gas to completely discharge air, and heating the reaction furnace; 3) when the temperature of the reaction chamber achieves 750-900 DEG C, adjusting the argon flow rate while introducing hydrogen; 4) injecting the ferrocene / dichlorobenzene / pyridine mixing carbon source solution into the reaction chamber, and carrying out a reaction; and 5) stopping the heating of the tubular reaction furnace, closing the hydrogen, adjusting argon flow rate to make the product be cooled to a room temperature along with the furnace, and collecting the large area nitrogen-doped carbon nano-tube paper on the substrate. According to the present invention, the nitrogen-doped structure carbon nano-tube film two-dimensional structure and the simple, rapid and large-scale preparation method can be used for the fields of new energy sources, sensors, flexible electronic devices, and the like.