30results about How to "Content does not affect" patented technology

The invention relates to a preparation method of an automobile urea solution. The method comprises the following steps: (1) selecting agricultural grade urea and pure water serving as raw materials, and preparing the raw materials into a urea solution; (2) purifying the urea solution prepared in the step (1) through a filter; (3) adding an aldehyde treatment agent into the urea solution obtained in the step (2) to lower the aldehyde content of the urea solution; and (4) loading the urea solution obtained in the step (3) through an ion exchange resin column, and removing metal ions and other impurities from the urea solution to obtain the urea solution which meets automobile use requirements. The preparation method disclosed by the invention is simple and easy to implement, and has high technical adaptability and high raw material yield. The obtained urea solution has low impurity content and good development and application values.

The invention discloses a method for recovering phenol and acetophenone from phenol tar, and belongs to the technical field of petrochemical engineering. The method comprises the following steps of: adding sulfate serving as a catalyst in the phenol tar, adding high-temperature solvent naphtha in the phenol tar simultaneously, stirring and heating, retaining the reaction for a period of time after the temperature is raised to 240 DEG C to 260 DEG C so as to enable the catalyst to be thoroughly and uniformly dissolved in the phenol tar, performing cracking reaction after the temperature is raised to 300 DEG C to 360 DEG C so as to obtain matters containing useful components such as phenol and acetophenone, wherein the boiling range of the high-temperature solvent naphtha is higher than 240 DEG C. According to the catalytic cracking way of the method, the color of the cracked product is transparent, the content of phenol acetone in the cracked product is high, and the recovery rates of phenol and acetophenone are improved obviously.

The invention provides a viscosity reduction type active macromonomer, and further provides a viscosity reduction type polycarboxylate water reducing agent. Compared with synthetic viscosity reductiontype polycarboxylate water reducing agents in the prior art, the viscosity reduction type polycarboxylate water reducing agent has the advantages that synergistic effects can be realized between various components and between various functional groups in the synthetic viscosity reduction type polycarboxylate water reducing agent, excellent viscosity reduction effects can be realized by the viscosity reduction type polycarboxylate water reducing agent, but influence on the water reducing ratio is prevented; large quantities of hydrophobic alkyl, ester and phenyl are led into PEG (polyethyleneglycol) side chains, accordingly, the HLB (hydrophile-lipophile balance) value can be effectively lowered, surface activity effects can be enhanced, good shrinkage reducing effects can be realized, and concrete with the added viscosity reduction type polycarboxylate water reducing agent is low in shrinkage and free of cracking; the viscosity reduction hydrophobic functional groups are positioned on the side chains, the viscosity reduction effects of the viscosity reduction type polycarboxylate water reducing agent can be adjusted by the aid of the contents of the viscosity reduction functionalgroups, but the influence on the contents of dispersion groups and influence on cement particle dispersion effects can be prevented, and accordingly influence on dispersion and water reducing effectsof the viscosity reduction type polycarboxylate water reducing agent can be prevented.

The invention discloses a method for reducing the content of organic volatile matter in a polypropylene processing process. The method comprises the following steps: A, preparing a group of polypropylene basic proportions comprising 70-90 parts of polypropylene, 10-30 parts of talcum powder, 0.5-1 part of a heat stabilizer DSTP, 0.15-0.5 part of an antioxidant 1010, 0.15-0.5 part of an antioxidant168 and 2-5 parts of a zeolite-adsorbed mixture of glycerin and water or a zeolite-adsorbed mixture of glycerin, water and ethyl alcohol, wherein the ratio of the glycerol to the water is 3:7 to 4:6and the ratio of the glycerin to the water to the ethyl alcohol is 3:3:4 to 3:6:1; and B, putting the components in the step A into a mixer for carrying out dry mixing for 3-5 minutes, putting the mixed materials into a double-screw extruder, carrying out melting and granulating, dissolving small molecules of a processing process in an extruding granulation process, and pumping out water or alcohol steam and organic volatile matter by using a vacuum pump, so that a polypropylene composite material with low odor and even no odor is obtained.

The invention provides concrete and also provides application of a viscosity reducing type polycarboxylate superplasticizer as shown in a formula (I) in preparation of tailing sand concrete. The mixedsand of tailing sand and machine-made sand is adopted and is matched with the viscosity reducing type polycarboxylate superplasticizer as shown in the formula (I) so as to overcome the technical defects of iron tailing sand concrete; the tailing sand and the machine-made sand are matched so as to adjust the sand grading and the fineness modulus; and the viscosity reducing type admixture is adopted so as to adjust the cohesiveness and flowability of the concrete, improve the workability of the concrete, especially the cohesiveness and water-retaining property of the concrete, as well as reducesegregation and weeping, so that the tailing sand concrete meeting construction requirements can be produced, and the utilization ratio of the iron tailing sand is promoted.