5results about How to "Reduce residual content" patented technology

The invention discloses a preparation method of polysulfone with stable color and reduced yellowness, which comprises the following steps: by using N-methyl pyrrolidone as a reaction solvent, reacting bisphenol A with 4, 4 '-dichlorodiphenyl sulfone in the presence of an acid-binding agent to generate polysulfone; wherein the N-methyl pyrrolidone contains N-methyl pyrrolidone peroxide, and the molar content of the N-methyl pyrrolidone peroxide in the N-methyl pyrrolidone is less than or equal to 0.05%. The polysulfone with stable color and reduced yellowness value can be synthesized by controlling the content of peroxide impurities in the N-methyl pyrrolidone.

The utility model provides an automatic mixing device for preparing hydroxyapatite, and relates to the technical field of hydroxyapatite preparation devices, the automatic mixing device comprises a mixing device barrel body, the bottom of the mixing device barrel body is provided with an electromagnetic valve, the surface of the mixing device barrel body is provided with a supporting column, and the supporting column is provided with a supporting rod. A control box is mounted at the top, close to the supporting column, of the surface of the mixing device barrel body, a top cover is mounted at the top of the mixing device barrel body, a handle is mounted on one side face of the top cover, a feeding opening is formed in the top of the top cover, a driving motor is mounted at the top of the top cover, and a rotating rod is mounted on the inner top face of the top cover; a connecting rod is mounted on the surface of the rotating rod, an adsorption pipe is mounted at the bottom of the connecting rod, and a positive electrode pipe is mounted in the adsorption pipe, so that impurities contained in hydroxyapatite can be adsorbed, the residual content of solid particles in the hydroxyapatite after mixing work is completed is reduced, and the quality of mixed liquid is improved.

The invention discloses an odorless formaldehyde-absorbing pure acrylic emulsion as well as a raw material composition, a preparation method and application thereof. The odorless formaldehyde-absorbing pure acrylic emulsion comprises the following components in parts by weight: 173-301 parts of a monomer, 20-26 parts of an emulsifier, 2.8-4.1 parts of an initiator and 10-30 parts of a multifunctional monomer, wherein the multifunctional monomer is selected from acetoacetoxyethyl methacrylate and / or adipic acid dihydrazide. The preparation method comprises the following steps: selecting a specific emulsifier and a multifunctional monomer methylacrylic acid acetoacetoxyethyl ester and / or adipic acid dihydrazide with a formaldehyde absorption function; meanwhile, more methyl methacrylate monomers are used, the methyl methacrylate monomers are difficult to hydrolyze in the polymerization process to produce methanol, then a specific dropwise adding reaction process strategy is combined, and finally oxidation-reduction post-treatment and steam stripping process treatment are performed, so that the odor of the emulsion is further reduced, and the prepared emulsion is ultralow in VOC (volatile organic compound) and residual monomer content. The pure acrylic emulsion has an excellent formaldehyde absorption effect and is durable.

This invention relates to the field of polymer resin materials technology, and discloses a method for preparing low-gloss, low-odor ABS resin and its application. The method provided by this invention is based on a bulk method, which is simple and easy to control. Using this method, ABS resin materials that simultaneously possess low gloss, low odor, and good mechanical properties can be obtained. Furthermore, the method of this invention eliminates the need for secondary processing, shortening the process flow, reducing energy consumption and pollution, and better ensuring the stability of product batch quality.

The invention belongs to the technical field of sewage treatment equipment, and provides food processing sewage treatment equipment and method.The equipment comprises a shell, two sets of partition plates are fixedly installed in the shell, located on the inner bottom face of the shell and distributed at intervals to form a channel, and a supporting plate is fixedly installed on the shell; a communication box is fixedly mounted on the supporting plate, and a rotating pipe is rotatably mounted on the communication box, so that the technical problem that protein is difficult to comprehensively collect due to the fact that the protein returns to sewage again during collection in the prior art is solved; and the intercepted and filtered particulate matters are adsorbed on the filter cloth, and in the cleaning process, the particulate matters are always located above the filter cloth, so that the particulate matters on the filter cloth are prevented from being separated and entering the shell again in the rotating process of the rotating frame, and the device can be widely applied to cleaning operation scenes of substances in sewage.