2396results about How to "Safe to use" patented technology

The invention discloses a bi-component cement based composite material for 3D (three dimensional) printing as well as a preparation method and application thereof. The bi-component cement based composite material for 3D printing comprises a component A and a component B, wherein the component A is prepared from 34 to 40 percent of sulphate aluminium cement, 0 to 6 percent of inorganic powder, 40 to 44 percent of tailing machine-made sand, 2.5 to 3 percent of high-molecular polymer and the balance of a retarder, a water reducer, a size stabilizer, a defoaming agent and water, the pumping performance can be well kept for a long time, an industrialized process of pre-stirring production in a mixing plant, transportation, and using in a construction site can be realized; the B component is prepared from a coagulate promoting agent, a thixotropic agent, a defoaming agent and water, the component is stable in form and can be stored for a long time or produced in a concentrated manner. After A and B are respectively pumped in a 3D printer, through high-speed stirring and being mixed by an extrusion head, the composite printing material can be extruded out, the time of coagulation is short, the strength is high, the adhesion is good, the stability is strong, the constructive continuity and building strength requirements of building 3D printing can be met, the industrial production and promotion of the cement based 3D printing material are facilitated, and the application of a 3D printing technology in buildings can be effectively promoted.

The invention relates to a preparation method of a double-ion type crude oil desalting demulsifier. The preparation method specifically comprises the following steps: (1) carrying out esterification modification on polyethylene glycol monomethyl ether; (2) preparing glycidyl dimethyl alkyl ammonium chloride; (3) preparing quaternary ammonium carboxymethyl chitosan; (4) making the modified polyethylene glycol monomethyl ether react with the quaternary ammonium carboxymethyl chitosan to obtain a polyethylene glycol monomethyl ether grafted quaternary ammonium carboxymethyl chitosan. The double-ion type crude oil desalting demulsifier takes natural macromolecular compounds of chitosan as raw materials, thereby having many advantages of wide sources, naturalness, no toxicity, sustainability, good product bio-compatibility and degradation and the like. The prepared demulsifier is good in demulsification and dehydration effects, furthermore, demulsifier molecules contain a large number of carboxyl alkyl groups and quaternary ammonium salt groups, so that the demulsifier has a very strong binding capacity for negatively charged ions such as metal cations, naphthenic acid radicals and particles of which the surfaces are electronegative, thereby further having the removal ability for oil soluble salts while performing demulsification.

The invention discloses an advertising board convenient to move and install. The advertising board comprises a fixed box and an advertising board body, wherein a first motor is fixedly connected to the top of the fixed box via a support frame; an output shaft of the first motor runs through the fixed box and extends into the fixed box; a first bevel gear is fixedly connected to the output shaft ofthe first motor via a shaft coupling; second bevel gears are meshed at two sides of the surface of the first bevel gear, and threaded rods are fixedly connected to the middles of the second bevel gears; movable blocks are connected to the surfaces of the threaded rods via screw threads; and rotary rods are rotatably connected to the surfaces of the movable blocks via movable pieces. The inventionrelates to the technical field of advertisement. With the application of the advertising board convenient to move and install provided by the invention, problems of an existing advertising board which is inconvenient to carry and move can be solved; and the advertising board device can greatly facilitate people in safe using, avoid inconvenience to the people, improve working efficiency of the people and reduce workload of the people.

The invention relates to a preparation method of a polyelectrolyte-type crude oil-desalting demulsifier. The preparation method comprises the following specific steps: (1) performing amination modification on methoxypolyethylene glycol; (2) preparing glycidyl dimethyl alkyl ammonium chloride; (3) preparing quaternized carboxyalkyl chitosan; (4) carrying out a reaction between the modified methoxypolyethylene glycol and the quaternized carboxyalkyl chitosan to obtain a target product methoxypolyethylene glycol-grafted quaternized carboxyalkyl chitosan. The polyelectrolyte-type crude oil-desalting demulsifier takes a natural macromolecule chitosan compound as a raw material, and has the advantages of wide sources, naturalness, non-toxicity, sustainability, good product biocompatibility, biodegradability and the like. The prepared demulsifier has good demulsifying and dehydrating effects; a demulsifier molecule contains a large number of carboxyalkyl groups and quaternary ammonium groups, which have very strong capacity of bonding metal cations, negatively-charged ions such as naphthenic acid radicals, and particles with negative charges on the surfaces, so that besides the demulsifying capability, the demulsifier also has the capability of removing oil-soluble salts.

The invention relates to a waterborne soft printing ink comprising the components: film-forming resin emulsion of 8.7-47.2wt percent, waterborne acrylic color paste of 40-50wt percent, antifoam agent of 0.1-0.3wt percent, waterborne wax paste of 0.2-2.0wt percent, isopropyl alcohol of 2-8wt percent, ethylene glycol of 10-30wt percent, ethanolamine of 0.5-1wt percent and water of the rest percent. The invention further provides a method to prepare the waterborne soft printing ink. The waterborne soft printing ink of the invention is nontoxic and environmental friendly, has good safety, stable performance and good adaptability to coated art paper printing, and can be continuously used in printing without mackle, has clear printing effect and low production cost.

The invention discloses natural plant mosquito-repellent liquid, which comprises the following raw materials in parts by weight: 40-60 of eatable ethanol, 1-10 of dementholized peppermint oil, 1-6 of citionella oil, 3-12 of wintergreen oil, 3-12 of citriodora oil, 3-12 of blumea oil, 3-12 of lavender oil, 1-5 of menthol, and 3-12 of rosemary oil. The natural plant mosquito-repellent liquid disclosed by the invention is prepared by adding enough eatable ethanol into a stainless steel container at first, adding other enough raw materials into the eatable ethanol to stir uniformly, filtering and tinning after standing for one day, emptying, storing, inspecting a semi-finished product, sterilizing a wrappage, filling, inspecting a finished product, and warehousing. The natural plant mosquito-repellent liquid disclosed by the invention is formed by scientifically refining a plurality of plant extract substances; the effective time for repelling mosquito bite outdoors is up to six hours; and the natural plant mosquito-repellent liquid is very obvious in effect and free from toxic and side effects and stimulation on human body.