36results about How to "No change in liquidity" patented technology

The invention provides a finished-product integrally jointed type three-dimensional printing head. The finished-product integrally jointed type three-dimensional printing head breaks through a construction form of a traditional three-dimensional printing head; a heating layer is used for carrying out further heating on raw materials in an outer conveying pipe, so that the temperature and flowability of the raw materials in the outer conveying pipe are higher than the temperature and flowability of raw materials in an inner conveying pipe; in a printing process, a lower inclined plane of a flexible heating block is in contact with a printing layer which is slightly cooled and condensed on a lower layer, so that the upper surface of the printing layer on the lower layer can be melted; meanwhile, the raw materials flowing out from an upper feeding hole and the raw materials flowing out from a lower feeding hole are gathered in a material discharging hole; the raw materials flowing out from the lower feeding hole are uniformly distributed at the periphery of the raw materials flowing out from the upper feeding hole to cover the periphery; then the raw materials flow out from a third channel and are in contact with the printing layer on the lower layer, so that the raw materials flowing out from the upper feeding hole and the printing layer on the lower layer are naturally fused toform a whole body, and an obvious jointing surface is not formed between a printing layer on an upper layer and the printing layer on the lower layer; the jointing between the adjacent printing layersis firmer.

The invention relates to a wet granulation technology of urea-formaldehyde resin. The technology comprises the following steps: 1, carrying out primary granulation: pouring urea-formaldehyde resin powder to a granulator, starting first slurry spraying to spray a first slurry to the granulator, allowing a stirring paddle and a granulating knife to be in a rotating state simultaneously, starting second slurry spraying to spray a second slurry to the granulator, and discharging obtained granules, wherein the first slurry is prepared through diluting formaldehyde, urea and urotropine with neutral distilled water, and the second slurry is prepared through diluting formaldehyde, urea and urotropine with neutral distilled water; 2, refining: pouring the granules produced in the granulator to an oscillating granulator, scattering agglomerated granules through the oscillating granulator, and adding zinc stearate powder in the scattering process; and 3, drying the obtained granules, and discharging the dried granules. The technology adopting the above technical scheme guarantees cleanness and no impurities of the granules, and also can guarantee no change of the fluidity of the urea-formaldehyde resin.

The invention relates to a preparation method of special-shaped polymer structure reinforcing composite light-weight cement, relating to a preparation method of composite light-weight cement and aiming at obtaining a light-weight high-strength cement building material. The preparation method comprises the following steps of 1, preparing a special-shaped polymer structure; 2, preparing cement slurry; 3, forming a light-weight cement composite material. The preparation method disclosed by the invention improves the reinforcing mechanism of the cement-based composite material from the independent reinforcement of a discontinuous reinforcement phase into the synergetic enhancement of a continuous reinforcement phase by substituting a continuous polymer special-shaped structure network for a discontinuous polymer fiber, thereby effectively enhancing the usage property of the cement-based composite material. The preparation method disclosed by the invention effectively reduces the weight of the material by 40%-50%, does not change the flowing property of the cement slurry, can be used for freely designing the structure of the reinforcement phases and integrally forming the composite material and a prefabricated structure, has the advantages of simple preparation process, low cost, high designability of a technical process, abundance in used raw material and the like and can effectively reduce the weight of the cement building material.

A C100 high-performance concrete, which is formed by mixing and gelling cementitious materials, sand, stone, water and admixtures. The cementitious materials include cement and admixtures. The amount of cementitious materials added per cubic meter of concrete 500-600kg, of which the cement is 42.5; the admixture has three components of silica fume, fly ash and slag powder, and contains active SiO2 in an amount of 20%-40% of the total weight of the cementitious material, and its specific surface area 1000-1200m2 / kg; the admixture is polycarboxylate high-efficiency water reducer with a dosage of 2% to 5% of the total weight of the cementitious material; the activator is soot and coal with a dosage of 1 to 5% of the total weight of the cementitious material A mixture of gangue fine powder. No special raw materials such as high-grade cement are needed, the production process is simple, and the manufacturing cost is low. While greatly improving the strength of concrete, it also improves the workability and durability of concrete.

The invention provides a three-dimensional printer (3DP) capable of producing firm finished products. Structural forms of traditional 3DPs are broken through, a heating layer is used for further heating raw materials in an outer conveying tube, and the temperature and fluidity of the raw materials in the outer conveying tube are made higher than those of raw materials in an inner conveying tube; in the printing process, the lower bevel of a flexible heating block makes contact with a lower printed layer which is slightly cooled and solidified, and the upper surface of the lower printed layer can be melted; meanwhile, raw materials flowing out of an upper feeding hole and raw materials flowing out of a lower feeding hole are converged in a discharging hole, the raw materials flowing out of the lower feeding hole are distributed uniformly on the peripheries of the raw materials flowing out of the upper feeding hole for a wrapping purpose, and then the raw materials flow out of a third channel to make contact with the lower printed layer, so that the raw materials flowing out of the upper feeding hole, and the lower printed layer are naturally fused into a whole; and an obvious junction surface between an upper printed layer and the lower printed layer does not exist, and junction between the adjacent printed layers are firmer.

The invention discloses a perfluor polyether oil-based magnetic liquid. The magnetic liquid is composed of bare Fe[3]O[4] magnetic nano-particles, a perfluor polyether carboxylic acid surface active agent and a perfluor polyether oil-based carrier liquid, the ratio of the bare Fe[3]O[4] magnetic nano-particles (g) to the perfluor polyether carboxylic acid surface active agent (ml) is 40:1-1:1, and the ratio of the modified bare Fe[3]O[4] magnetic nano-particles (g) to the perfluor polyether carboxylic acid surface active agent (ml) is 1:20-2:1. The saturation magnetization of the perfluor polyether oil-based magnetic liquid is 14-600 Gs, the magnetic liquid has the excellent special performance of resisting to chemical corrosion, high temperature, low temperature resistance and radiation and never burning, and can work stably for a long time at the temperature of 40 DEG C below zero-200 DEG C at the pH value of 1-14, a magnetic liquid of a conventional type can not achieve the effect, and the perfluor polyether oil-based magnetic liquid is particularly suitable for space stations, aeronautics and astronautics and other military industry fields.