58results about How to "Simple and reliable operation process" patented technology

The invention provides a scratch-resistant polypropylene composition which comprises the following blended components in parts by weight: 100 parts of polypropylene resin and 0.05-30 parts of scratch-resistant agent, wherein the scratch-resistant agent is formed by blending the following components in parts by weight: 100 parts of full-vulcanized powdered butadiene styrene rubber, 1-100 parts of hydrocarbon oil and/or 1-200 parts of polysiloxane lubricant. The polypropylene composition not only has good mechanical properties of impact resistance, rigidity and the like, but also has good scratch resistance. Moreover, after the polypropylene resin is used for long time, the appearance of the product can not change. The preparation method is simple. The polypropylene composition is applicable to the products of automobile interior and exterior trim parts, electronic and electrical shells and the like.

The invention provides a method for preparing impact-resistant polypropylene with low VOC (Volatile Organic Compounds) content. The method comprises a propylene homopolymerization stage and a propylene copolymerization stage, wherein at the propylene homopolymerization stage, a propylene homopolymerization reaction is carried out in the presence of a Ziegler-Natta catalyst containing a first external electron donor and hydrogen gas so as to obtain a material flow 1 containing a homopolymerized polymer A and the catalyst, and at the propylene copolymerization stage, a propylene and alpha-olefin copolymerization reaction is carried out in the presence of the material flow 1 and a second external electron donor so as to obtain a polypropylene flow 2 containing the homopolymerized polymer A and a copolymerized polymer B; and the first external electron donor is trialkoxysilane, and the second external electron donor dialkoxysilane. According to the method, impact-resistant polypropylene products with narrow molecular-weight distribution, low ultralow-molecular-weight component content, light odor and low VOC content can be produced without special catalysts and great change on the existing processing equipment.

The invention provides a method for preparing anti-shocking polypropylene with low odor and low VOC content. The method comprises the following steps: in the presence of a Ziegler-natta catalyst containing a first external electron donor, and hydrogen, performing propylene homopolymerization, thereby obtaining a material flow 1 containing a homopolymerization polymer A and the catalyst; in the propylene copolymerization period, performing polymerization reaction on propylene and alpha-olefin in the presence of the material flow 1 and a second external electron donor, thereby obtaining a material flow 2 containing the homopolymerization polymer A and a copolymerization polymer B, wherein the first external electron donor is a 1,3-diether compound; the second external electron donor is alkoxysilane. By adoption of the method, an anti-shocking polypropylene product with narrow molecular weight distribution, ultralow molecular weight component content, low odor and low VOC content can be produced without using a special catalyst or greatly changing a conventional process device.

The invention discloses a PA (polyamide)/ABS (Acrylonitrile Butadiene Styrene) composite material and a preparation method thereof, relating to the technical field of high polymer materials. The PA /ABS composite material comprises 40-80 parts by weight of polyamide, 15-50 parts by weight of ABS and 5-30 parts by weight of polarization SDS (Sodium Dodecyl Sulfonate). The preparation method comprises the following steps of: evenly mixing all components, including PA, ABS and polarization SDS, in the component proportion by a mixer; fusing, mixing and extruding by double screws; and finally granulating to obtain the PA /ABS composite material. The invention better solves the problem of compatibility between PA and ABS, and the composite material has excellent comprehensive mechanical property.

The invention belongs to the field of plastics, and relates to a low-VOC low-odor polypropylene resin composition and a preparation method thereof. The preparation method comprises: (1) dissolving octaisobutylsilsesquioxane in n-hexane to obtain the n-hexane solution of octaisobutylsilsesquioxane; (2) mixing the n-hexane solution of the octaisobutylsilsesquioxane and polypropylene powder, and drying the mixed material to achieve a constant weight; (3) uniformly mixing an acid-absorbing agent, an antioxidant and the dried material obtained in the step (2) to obtain a premix; and (4) carrying out melt blending on the premix to obtain the polypropylene resin composition. According to the present invention, the total volatile organic compound (TVOC) of the polypropylene resin composition can be significantly reduced so as to well solve the disadvantages in the prior art; the operation process is simple and reliable, and the investment cost is low; and the obtained product is suitable for high-grade vehicle interior decoration members, medical and food packaging materials, and other fields with high environmental protection requirements.

The invention discloses a moving type hangar, which comprises three parts of end doors, a middle main body and an accessory. The main structure of the moving type hangar disclosed by the invention adopts the modular design; the whole hanger comprises end door modules distributed on two ends of the hangar, and multiple groups of middle main body modules, wherein the end of each group of module is provided with a port; except that the end door position is fixed, the rest modules of the hangar can be subjected to unordered mutual connection. The manufacture material of the main structure of the moving type hangar is selected from one or multiple types of PVC (polyvinyl chloride) membrane material, TPU (thermoplastic urethanes) membrane material, EVA (ethylene vinyl-acetate) membrane material, acrylic ester membrane material, neoprene membrane material, butadiene styrene rubber membrane material, ETFE (ethyl tetra fluoro ethylene) membrane material, PVDF (polyvinylidene fluoride) membrane material, PTFE (polytetrafluoroethylene) membrane material and PVF (polyvinyl fluoride) membrane material. The moving type hangar is erected with an inflation method, each group of modules can be respectively curly packaged after venting, and the moving type hangar has the advantages of strong maneuverability, simple operation process, stable and reliable performance, advanced technical index, scientific structural design, cheap and abundant raw materials and mature manufacture technology and is suitable to popularize and apply within a large range in the industry.

The invention relates to an iron-supported zinc aluminate nano powder and a preparation method thereof, and belongs to the technical field of powder material preparation. The nano powder is prepared by taking zinc salt, aluminum salt and iron salt as raw materials and adding a surfactant. The particle size of the nano powder is 20-200 nm, and the surface of the nano powder contains Fe2+ and Fe3+ ions. The nano powder takes the zinc salt, cobalt salt and the aluminum salt as raw materials, ZnAl2O4 powder is prepared from a surfactant cetyltrimethylammonium bromide (CTAB) under the assistance ofa hydrothermal method, and the obtained ZnAl2O4 powder is placed in an iron salt solution to undergo magnetic stirring, ultrasound-assisted wet process dipping, drying and sintering to obtain the iron-supported zinc aluminate nano powder. According to the iron-supported zinc aluminate nano powder, the problems that an iron load is uneven and the bonding strength of a load and a carrier is not high can be solved, the nano powder has a particle size of 20 nm to 200 nm, and the morphology is spherulitic.

The invention provides a modified cellulose nanometer crystal, a high-strength hydrogel material, a preparation method and an application. The modified cellulose nanometer crystal comprises a cellulose nanometer crystal body and methyl cellulose which is combined with the crystal body by an aldol condensation reaction, in the aldol condensation reaction, and the substitution degree of methyl cellulose is as follows: 0.002-0.1 hydroxyl radical in each glucose unit in a cellulose nanometer crystal is substituted. The high-strength hydrogel material is prepared by the following steps: 0.2-20 parts of methyl cellulose and 0.1-10 parts of the modified cellulose nanometer crystal are added into 100 parts of water in order to obtain mixed liquor, and stirring is carried out at a room temperaturein order to obtain the product. The application is as follows: the high-strength hydrogel material is injected along a vertical direction of water containing wooden historical relics in an injection mode; the materials are permitted to stand at 40-70 DEG C for 0.5-10 hours, in order to realize solution-gel phase transformation of the high-strength hydrogel material, and complete penetration and reinforcing of the high-strength hydrogel material; and finally dehydration treatment is carried out, and reinforcing, dehydration, and protection treatment are completed.

The invention relates to a polypropylene/cellulose intercalation nanocrystal composition and a preparation method thereof. The polypropylene/cellulose intercalation nanocrystal composition contains the following blended components: polypropylene and cellulose intercalation nanocrystals. According to the polypropylene/cellulose intercalation nanocrystal composition disclosed by the invention, the dispersity of CNCs in polypropylene and the interfacial compatibility of the CNCs and polypropylene are obviously improved, the thermal degradation temperature of the CNCs is effectively increased, and the composition is suitable for a melt blending and extrusion process. In addition, the crystallinity degree of the polypropylene is increased, the rigidity of the polypropylene composition is further obviously improved, the operation process is simple, and the composition is applicable to the fields of high-grade automobile materials, household appliance materials, medical and food packaging materials with high rigidity requirements and the like.

The invention relates to a polypropylene/cellulose intercalation nanometer crystal masterbatch in the field of plastics. The polypropylene/cellulose intercalation nanometer crystal masterbatch comprises the following blended components: polypropylene and a cellulose intercalation nanometer crystal. The invention also discloses a preparation method and an application for the polypropylene/cellulose intercalation nanometer crystal masterbatch. The polypropylene/cellulose intercalation nanometer crystal masterbatch provided by the invention endows a cellulose nanometer crystal and polypropylene with good interfacial compatibility by utilizing intercalation modification of long-chain alkane in the cellulose intercalation nanometer crystal, significantly improves dispersity of the cellulose nanometer crystal in polypropylene and interfacial compatibility of the cellulose nanometer crystal and polypropylene, effectively improves the thermal degradation temperature of the cellulose nanometer crystal, and is applicable to the fields like advanced automotive materials, household appliance materials and medical and food packaging materials with high rigid requirements.

The invention belongs to the technical field of light polyurethane rigid foams and discloses a reinforcing and antistatic light polyurethane foam and a preparation method thereof. The preparation method of the reinforcing and antistatic light polyurethane foam comprises synthesizing a conductive polymer through emulsion synthesis, and then adding in measuring oxidizing agent; adding in polymer monomers in a diluted and dropwise mode for reaction for 6-24 hours; performing normal washing, filtering, evaporating or freeze-drying treatment on collected reaction products; performing normal aftertreatment on the synthesized conductive polymer by soaking the synthesized conductive polymer in micromolecular agent for 30 minutes to 24 hours, wherein the micromolecular agent participates in the reaction to achieve reinforcement of polyurethane rigid foams with increasing the density of the polyurethane rigid foams; effectively mixing the conductive polymer with commercial polyurethane foaming black materials and white materials, specifically, fully mixing the black materials and the white materials at a foaming temperature of 10-50 DEG C for foaming production to obtain the light-weight andhigh-strength antistatic polyurethane foam. The preparation method of the reinforcing and antistatic light polyurethane foam is high in foaming capacity, and the prepared reinforcing and antistatic light polyurethane foam achieves an electric conductivity rate up to 106-108 ohm/cm2, a Shore hardness of 25-90 HD and a Rockwell hardness of 15-60 HRC.

The invention discloses a preparation method of low-VOC polypropylene resin and the polypropylene resin prepared by the method. The method comprises the following steps: before mixing and granulatingpolypropylene powder and a processing aid, soaking and extracting the polypropylene powder by a solvent, and then performing drying until the powder is free of weight loss, wherein the solvent is an alkane of C6-C8, the soaking and extracting temperature is in a range of 30-60 DEG C, the processing time is 8-72 hours, the drying temperature is 70-80 DEG C, and the drying time is 4-6 hours. The content of total volatile organic compounds (TVOC) of the polypropylene resin disclosed by the invention is lower than 40 [mu]g*C/g and the polypropylene resin can be widely applied to the fields with relatively high environmental protection requirements, such as high-grade automobile interior ornaments, medical use, food packaging materials and the like. In the preparation process, the operation process is simple and reliable, the investment cost is low, and the defects in the prior art are well solved.

The invention provides a rectangular shield tunnel lining-shaped rectification device and a rectification method. An upper beam and a lower beam are driven by a top supporting device to extend along a vertical direction, so a multi-ring lining ring is pressed against; the shape of the multi-ring lining ring can be maintained and rectified; a problem of difficulty in assembling for post-pipe sheets due to bearing deformation of the tunnel lining can be effectively solved; the rectification device can be simply and reliably operated; top supporting action points of the upper beam and the lower beam are formed on a seam crossing part of two lining rings; and damage to the lining can be avoided and construction safety can be guaranteed.

The invention relates to a low-odor impact-resistant scratch-resistant polypropylene composition and a preparation method thereof, belonging to the field of plastics. The low-odor, impact-resistant and scratch-resistant polypropylene composition can comprise the following blended components in parts by weight: polypropylene, hydrophobic fumed silica, a polypropylene graft polymer and octaisobutyl silsesquioxane, the material comprises the following components in parts by weight: 100 parts of polypropylene, 0.5-18 parts of hydrophobic fumed silica, 0.5-24 parts of polypropylene graft polymer and 0.02-2 parts of octaisobutyl silsesquioxane. The odor of the polypropylene resin composition disclosed by the invention can be remarkably reduced, the odor can reach 3.5 grade or below, the scratch resistance is greatly improved, the rigidity is improved while the impact property is improved, the defects in the prior art are well overcome, and the polypropylene resin composition is simple and reliable in operation process, relatively low in investment cost and suitable for the field of pipes.

The invention belongs to the field of polypropylene resin, and relates to low-VOC-content polypropylene resin and a preparation method thereof. The method comprises the following steps that polypropylene is pretreated through a fluidized drying bed, then the treated polypropylene is dried in a vacuum oven, then the dried polypropylene and a processing aid are blended, extruded and granulated, and the pretreatment conditions of the fluidized drying bed include the conditions that the air inlet temperature is 80-150 DEG C, the air speed of an air inlet is 1-25 m/s, the gas-solid ratio is larger than or equal to 3, and the pretreatment time is 30-120 min. According to the low-VOC-content polypropylene resin and the preparation method thereof, the polypropylene is treated by adopting the fluidized drying bed, the content of total volatile organic compounds in a polypropylene material is remarkably reduced, and the problem of residues of volatile organic compounds in the polypropylene resin is solved.

The invention discloses a cement solidification system and method for radioactive waste treatment and application. The system comprises a three-axis rail car, a rail, a scale detection system and a wireless control system. The three-axis rail car comprises a horizontal moving system, a vertical lifting system and a rotating system, the horizontal moving system, the vertical lifting system and therotating system respectively comprise a motion speed reducer, a lifting speed reducer or a rotating speed reducer, and the three-axis rail car is controlled by the wireless control system to move on arail and realize lifting and rotating. The scale detection system is used for detecting the position of the three-axis rail car on the rail in real time. The wireless control system is used for receiving the position information, detected by the scale detection system, of the three-axis rail car and judging whether the motion speed reducer or the lifting speed reducer or the rotating speed reducer is started or not according to the detected position information. According to the invention, the problems of high equipment cost, complexity and poor applicability caused by adoption of a cement solidification line in treatment of radioactive wastes in the prior art are solved.

The invention discloses a deep hole blasting vibration reduction method, which belongs to the technical field of deep hole blasting, and comprises the following steps of: respectively arranging a hole bottom support interval section, a lower explosive filling section, an inter-hole support interval section, an inter-hole explosive filling section and a rock powder filling section in each blast hole from bottom to top according to a distance, and charging the two explosive filling sections in sections; meanwhile, a water interval or an air interval is formed in the two interval sections through the supporting frame, then segmented blasting is carried out, the explosive use amount and the maximum section explosive amount are reduced, then blasting vibration is reduced, the blasting effect is improved, no bottom root exists after blasting, the blasting cost is reduced, the mine economic benefits are improved, and practicability is high.