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781results about How to "Environmental protection is good" patented technology

Multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate

The invention relates to a multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate, belonging to the field of sound absorption technologies. The invention solves the problems of small chamber volume ratio, narrow sound absorption frequency band and poor sound absorption effect in the traditional sound absorption panels. Technical essential is characterized in that a sandwich layer is a cellular sandwich layer; the cellular sandwich layer is formed from splicing a plurality of cylinder bodies with hexagonal cross sections; an inner cavity of each hexagonal cylinder body is a cell cavity chamber; the chamber volume ratio of the sandwich layer is larger than 90%; the area of perforation shape surrounded by contour lines of each perforation is less than a half of the hexagonal area of corresponding sandwich layer; and each small through hole on a panel is communicated with the cell cavity chamber at the corresponding position of the sandwich layer. The invention has wider sound absorption frequency band and better medium high frequency sound absorption performance, and the sanding wave tube method sound absorption coefficients respectively reach 0.8, 0.9 and 0.7 at 500Hz, 1000Hz and 2000Hz. In addition, the invention also has the characteristics of light weight, high ratio of strength to weight, good decorative effect, and the like; and wood resources can be saved, preparation process is simple, and cost is low.
Owner:NORTHEAST FORESTRY UNIVERSITY

Preparation process, product and application of new plastic

The invention provides a process for preparing a new plastic, which comprises the following steps: (1) preparing raw materials; (2) weighing and proportioning the raw materials; (3) mixing PVC powder, stabilizers, packing, plasticizers and other additives, then carrying out high-speed kneading on the obtained mixture, and preplasticizing the mixture so as to obtain a pre-plasticized mixture; (4) mixing the pre-plasticized mixture with TPU particles, carrying out banbury mixing on the obtained mixture under the condition of gradient temperature control so as to obtain colloidal products; (5) carrying out double-screw granulation on the obtained colloidal products; and (6) carrying out sorting, dehydration and packing on the granular products obtained in step 5 so as to obtain the new plastic. The process is simple, the conditions of the process are easy to control, and the process is suitable for large-scale production. The invention also provides a new plastic, which has the characteristics of high resistance to wear and scrape, high elasticity, easy recovery, high flame retardance, ultraviolet resistance, freezing damage (caused by low temperature in the north) resistance, environmental protection, soft handfeel and stick resistance, and the like; and the new plastic can be applicable to wire and cable compound.
Owner:GUANGDONG OMG TRANSMITTING TECH CO

Composite flame-retardant expandable polystyrene particles and preparation technology thereof

Disclosed are composite flame-retardant expandable polystyrene particles and a preparation technology thereof. The particles are prepared from the following components of: by weight, 100 parts of styrene monomer, 100-150 parts of water, 1-10 parts of expandable graphite, 1-12 parts of a phosphorus compound, 0.1-0.5 part of white oil, 0.1-0.5 part of polyethylene wax, 0.05-0.2 part of dicumyl peroxide, 0.2-0.8 part of benzoyl peroxide, 0.1-0.4 part of polyvinyl alcohol, 1.1-2.1 parts of tricalcium phosphate and 8-12 parts of pentane. By the addition of a composite fire retardant of expandable graphite and the phosphorus compound before polymerization of styrene, adverse influence of the fire retardant on performance of the product is reduced; expandable graphite and the phosphorus compound are halogen-free fire retardants, the particles have good environmental protection performance; by the addition of white oil, the particles have plasticising and internal lubricant functions as well as good stability and low volatility, and fluidity during the forming of polystyrene particles can be greatly improved; polyvinyl alcohol and tricalcium phosphate are dispersion stabilizers and by timely adding a proper amount of the dispersion stabilizers, the product appearance can be improved, the production efficiency can be raised, and cost can be reduced; and the addition of all the components guarantees the performance of the product.
Owner:BEIJING HUACHEN DECHUANG CHEM TECH

Static mixed rotational flow separation and extraction process of regenerative base oil N-methyl pyrrolidone

The invention relates to a static mixed rotational flow separation and extraction process of regenerative base oil N-methyl pyrrolidone, comprising the following steps in sequence: (a) carrying out sedimentation of used oil and removing moisture and solid impurities; (b) filtering by a filter, and removing tiny solid particles and colloids; (c) adding sodium hydroxide solution and flocculating; (d) removing floccules and residual sodium hydroxide solution; (e) carrying out reduced pressure distillation by a distiller, and collecting distillate oil; (f) mixing the distillate oil with organic solvent by a static mixer on line; (g) separating out raffinate oil and raffinate oil containing organic solvent from mixed liquor by a swirler; (h) carrying out the reduced pressure distillation on the raffinate oil by a climbing film evaporator, and removing the organic solvent in the raffinate oil; and (i) carrying out the reduced pressure distillation by a molecule (short range) distiller, removing residual organic solvent and peculiar smell gas, and obtaining the regenerative base oil. The separation and extraction process provided by the invention has the advantages of conciseness in procedure, safety in operation, less equipment investment, high product yield, energy conservation, environmental friendliness and the like.
Owner:ANHUI GUOFU LUBRICANT IND

Composite fiber felt and composite fiber board for automobile inner decoration and preparation methods of composite fiber mat and composite fiber board

The invention discloses a composite fiber felt and a composite fiber board for automobile inner decoration and preparation methods of the composite fiber felt and the composite fiber board. The composite fiber board for automobile inner decoration comprises one or more first felt layers, and each first felt layer contains the following ingredients in percent by weight: 30%-50% of polylactic acid fibers, 40%-60% of jute fibers subjected to surface treatment by isocyanate and 0%-20% of natural bamboo fibers subjected to surface modification treatment by titanate. The natural bamboo fibers and the jute fibers are natural fibers and the polylactic acid fibers are degradable fibers and the composite material prepared from the fibers are free from pollution, excellent in environment-friendly performance and easy to recycle. After surface modification treatment, the natural bamboo fibers and the jute fibers are composited with the polylactic acid fibers to prepare the composite board, so that the strength and the toughness of the composite board are improved greatly without increase of board density, and the composite board can be used as base materials of automobile inner decoration parts such as automobile roofs and inner board frameworks with high requirements on strength.
Owner:CHINESE TEXTILE ACAD

High-activity biological nutrient solution fertilizer for spraying dripping irrigation, and preparation method thereof

The invention provides highly active biological nutritional manure for drip irrigation. High-content amino acid leftover, high-protein animal dry matter, and rapeseed are crushed and mixed into 80 mesh to 350 mesh to obtain the high amino acid animal and plant powder; a certain amount of sugar, yellow humic acid, organic acid, poly peptide powder, microelement, effective adjuvant, sodium hexametaphosphate, and nitrogen, phosphor, and potassium fertilizers are added into the high amino acid animal and vegetable powder, and heated to 50 DEG C to 60 DEG C to carry out a complex reaction for 2 to 5 hours so as to prepare preparation A; urea is completely dissolved in water a temperature ranging from 35 DEG C to 40 DEG C to prepare preparation B; and then, the preparations A and B are mixed with each other and milled through a colloid mill to ensure that the floating granularity has a diameter of less than 120 microns. At last, the milled preparations are added with active microelement strain liquid, thoroughly mixed, and naturally fermented to obtain the product. The product has the advantages of high vegetable amino acid content and high biological activity, long effective period, obvious effect on growth increase, and simple technique.
Owner:师进

Lifting repair method for ballastless track with settled curved section

The invention belongs to the technical field of repair of high-speed railway ballastless tracks and particularly relates to a lifting repair method for a ballastless track with a settled curved section. The lifting repair method for the ballastless track with the settled curved section comprises the steps that after a lifting unit and the lifting quantity of the curved section of the ballastless track are determined, a high-pressure grouting device is adopted, grouting is conducted on a lifting hole and a filling hole in sequence according to determined equipment parameters, hole positions, a grouting sequence, a grouting rhythm and construction steps with a triangle balance lifting method at a certain pressure, grouting materials are injected into the position below the ballastless track through a grouting pipe installed in the grouting hole in advance and are rapidly cured, longitudinal displacement change, transverse displacement change and vertical displacement change of the track are monitored in real time through a measuring device, and then accurate lift, balance supporting and rapid repair are conducted on a settled ballastless track structure. According to the lifting repair method for the ballastless track with the settled curved section, construction is rapid, practicability and reliability are achieved, cost is low, and the method which is rapid and convenient to implement, practical and economical is provided for solving of the problem of settlement of the ballastless track within skylight time.
Owner:RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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