65results about How to "Control residue" patented technology

The invention discloses a method for a preparing low density polypropylene foam section or beads by two-step extrusion molding, which comprises the following steps that: expandable master batch is prepared from 30 to 80 portions of polypropylene, 10 to 40 portions of foaming agent, 0 to 15 portions of foaming accelerant, 0 to15 portions of dispersant and 0 to 10 portions of nucleating agent at a temperature below the decomposition temperature of the foaming agent and above a viscous flow temperature of the polypropylene; 20 to 99 portions of polypropylene with high melt strength, 0 to 70 portions of common polypropylene and 1 to 10 portions of expandable master batch are plasticizated and extruded together; supercritical gas is added to perform the blending of the plasticizated and extruded mixture; and the product obtained is made to generate foamcores in a foaming nucleation apparatus to form the section or beads finally. A chemical foaming agent is partially decomposed and foamed during the plasticization and extrusion, so that the viscosity of fused mass is reduced, the dissolution and dispersion of the supercritical gas are facilitated, and a problem that a foam imploding is likely to happen in a secondary forming process so as to influence the quality and appearance of secondarily formed product is solved as the chemical foaming agent retained in molding beads can be decomposed and foamed again during the secondary processing.

The invention relates to a preparation method of maleic anhydride graft polypropylene wax, which is characterized by comprising the following steps: heating and melting polypropylene wax in a kettle by using a heating system and a mixer of a reaction kettle; mixing a maleic anhydride graft monomer with the addition of 1.5 to 8.0 of polypropylene in percentage by weight by controlling the mixing rate from 120 r / min to 250 r / min at reaction temperature from 100 DEG C to 250 DEG C; adding an initiating agent with the addition of 1 / 30 to 1 / 10 of the adding quantity of maleic anhydride and a graft active agent with the addition of 1:3 to 2:1 of the weight of the maleic anhydride at reaction time from 0.5 hour to 10 hours, thereby completing the graft reaction of the maleic anhydride; and then cooling, pelleting or crushing maleic anhydride graft polypropylene wax so as to complete the preparing process of the maleic anhydride graft polypropylene wax. The invention also discloses a relative device. The preparation method of maleic anhydride graft polypropylene wax has the advantages of simple and reasonable technology, easy manufacture, low production cost, simplified product formula, and the like.

The invention relates to a high-efficiency environmental-friendly polypropylene compatilizer and a preparation method thereof. 60-95 polypropylene, 0.1-10 initiating agent, 1-20 maleic anhydride, 0.5-15 comonomer and 0.1-7 antidegradant are put in a high-pressure reaction vessel by weight percent (the sum of weight percent of all the raw materials is equal to 100 percent.), the solid phase grafting reaction is performed to the mixture for 0.2-2 hours under the stirring action to obtain polypropylene initiation masterbatch, then 2-30 percent by weight of polypropylene initiation masterbatch and 70-98 percent by weight of pure polypropylene are mixed in a high-speed mixer at the room temperature, then the melting graft reaction is performed to the mixture on a double-screw extruder, and then the extrusion granulation is carried out to obtain the maleic anhydride grafted polypropylene compatilizer. Compared with the prior art, the method is simple and also suitable for the industrial production, and no solvent is required to be used, therefore, no harmful toxic matter emission exists, and meanwhile, the high-efficiency environmental-friendly polypropylene compatilizer has low residual quantity of acid anhydride and odor and is beneficial to environmental protection.

The invention discloses a preparation method of non-thermal-processed kiwi fruit juice. The preparation method of the non-thermal-processed kiwi fruit juice comprising the following steps: taking fresh kiwi fruits as raw materials; carrying out washing, removing hairs from the washed kiwi fruits, and carrying out first juicing; filtrating the juice, adding a compound enzyme preparation into the filtrated kiwi fruit residues so as to carry out enzymatic hydrolysis; carrying out second juicing so as to effectively improving juice yield and production efficiency by adopting a method combining two-time squeezing and enzymatic hydrolysis; adjusting pH value of the kiwi fruit juice to 3-4, adding 0.04% of chitosan into the pH-value-adjusted kiwi fruit juice so as to achieve the purposes of clarifying and removing astringency, and providing the best bacteriostatic conditions to the chitosan; and finally, further carrying out enzyme-inactivation and sterilization on the juice by utilizing an ultrahigh-pressure sterilizing technology for 15-25 minutes, wherein the pressure is 400-600Mpa. Combination of the ultrahigh-pressure sterilizing technology and the chitosan bacterium-inhibiting technology makes the prepared kiwi fruit juice clear, free of astringency, stable in color and luster as well as few in nutrient loss; moreover, storage life of the kiwi fruit juice is up to 30 days.

A micromechanical structure and a corresponding manufacturing method are described. The structure includes a substrate (10), which has an anchoring device (20), and a centrifugal mass (30), which is connected to the anchoring device (20) via a flexible spring device (40), so that the centrifugal mass (30) is elastically deflectable from its rest position. The centrifugal mass (30) has clearances and is designed to be deflectable by etching a sacrificial layer (50) underneath it. The sacrificial layer (50) is present in a first area located underneath the centrifugal mass (30) with a first etchable thickness (d1), and in a second area located underneath the centrifugal mass (30) with a second etchable thickness (d1+d2+d3), the second thickness being greater than the first thickness (d1). The centrifugal mass (30) is structured in the first area so that in etching only a maximum of two etching fronts may come together in order to limit the etching residue deposits.

The invention provides a purification method of human glucagon like peptide-1 (hGLP-1) analogue fusion proteins (including dulaglutide). The purification method includes the step that a three-step chromatography method is adopted for purification, specifically, a sample is firstly subjected to a coarse purification step of Protein A affinity chromatography so as to effectively remove impurities such as HCP and endotoxin and maintain the high objective protein yield; and then anion exchange chromatography and hydrophobic chromatography are used for further fine purification so as to effectivelyremove charge isomers, residual HCP and other trace impurities in the sample, the content of all the impurities is controlled within the administration safety range, and the high objective protein yield and activity are maintained. According to the purification method, during separation and purification of an objective protein, good reproducibility and stability are achieved, and the purificationmethod is suitable for downstream purification process linear amplification of the hGLP-1 analogue fusion proteins so as to be used for production and preparation of drugs for treating type 2 diabetes or slimming drugs.

The invention discloses a method for preparing sodium hydrosulfide from hydrogen sulfide acid gas containing carbon dioxide, which belongs to the technical field of decarburization. The method comprises the following steps of firstly, mixing buffer solution containing sodium hydroxide and sodium bicarbonate with non-decarburized hydrogen sulfide acid gas to react and absorb carbon dioxide and hydrogen sulfide in the acid gas, so as to obtain decarburized pregnant solution, and then, heating the decarburized pregnant solution to make the sodium hydrosulfide in the decarburized pregnant solution hydrolyze and change into sodium hydroxide, wherein the sodium hydroxide generated by hydrolysis reaction reacts with free alkali and sodium bicarbonate in the decarburized pregnant solution to generate sodium carbonate; conveying the hydrogen sulfide acid gas without carbon dioxide into a tubular mixing reactor, performing reverse absorption with circulated alkali liquor to obtain pregnant solution containing sodium hydrosulfide, evaporating and concentrating the pregnant solution containing sodium hydrosulfide to obtain sodium hydrosulfide products of different levels. The method provided by the invention can remove carbon dioxide from hydrogen sulfide acid gas, and quality of the sodium hydrosulfide product prepared from the decarburized acid gas is controllable and adjustable.

An eurotium cristatum LS1 strain is classified and named as EurotiumCristatum LS1 and preserved in China Center for Type Culture Collection on June 17, 2015, and the preservation number is CCTCC NO:M 2015379. The strain LS1 can grow on kudzuvine roots and conduct bioconversion, when the strain LS1 is used for fermenting kudzuvine roots, an obtained fermenting product has stronger inhibiting effects on cowpea anthracnose, tomato early blight, sclerotinia sclerotioru and Chinese cabbage leaf spots, and the inhibiting effects on five putrefactive bacteria of staphylococcus aureus, bacillus cereus, escherichia coli, bacillus subtilis and salmonella are all improved than those before fermentation is conducted. It is shown that a product obtained by fermenting kudzuvine roots through the strain LS1 has broad-spectrum antibacterial activity, can inhibit pathogenic fungi and the putrefactive bacteria to some extent, is expected to be developed into biopesticides to prevent and control crop diseases and is expected to serve as a food sterilizing agent to be used for food preservation.

The invention discloses a preparation method of cefazolin sodium with previous research quality. The preparation method is characterized by comprising the following steps: (1) adding a boron trifluoride-dimethyl carbonate solution into dimethyl carbonate; stirring and adding 2-sulfydryl-5-methyl-1,3,4-thiadiazole and 7-ACA (Acetic Acid) to react; after the reaction is finished, adding dimethyl formamide and dropwise adding hydrochloric acid; adjusting the temperature to 25 to 35 DEG C and reacting for 60 minutes; filtering and washing with acetone; drying in vacuum to obtain a TDA (Toluene Diamine) crude product; (2) preparing mixed anhydride from dichloromethane, tetrazolyl acetic acid, triethylamine and pivaloyl chloride; (3) adding the TDA crude product into a dichloromethane solvent; cooling and dropwise adding tetramethyl guanidine; dropwise adding the mixed anhydride to react, and purifying and refining a crystal through a low-temperature acetonitrile-water extraction process after extraction and crystallization. With the adoption of the preparation method provided by the invention, the moisture content of the product can be reduced and residues of the solvent can be reduced; the increasing of related substances can be effectively reduced, a freeze-drying technology is not used and the production efficiency is improved.

The invention provides a method for controlling organic solvent residue in thymosin alpha 1PLGA microspheres. The method comprises the following steps: stirring a prepared thymosin alpha 1PLGA microsphere emulsion or multiple emulsion under normal temperature and normal pressure at a speed of 500-1200rpm for 3 hours; stirring the emulsion or multiple emulsion for 2-18 hours under the conditions of vacuum degree of -0.035MP to -0.096MP, a temperature of 26-35 DEG C and rotating speed of 50-800 rpm. The method for controlling organic solvent residue in thymosin alpha 1 microspheres provided by the invention is efficient, controllable, stable in process, safe, reasonable and capable of effectively controlling the residue problem of such organic solvents as dichloromethane and keeping the integral forms of the microspheres at the same time.

The invention discloses fast absorption type water-absorbent resin and a preparation method thereof, and belongs to the technical field of water-absorbent resin. After a neutralization reaction is carried out, a microsphere foaming agent is added into a neutralization solution, the microsphere foaming agent releases heat and generates gas through a polymerization reaction, and a glue block swellsby several times under the action of the gas; then pelleting, drying and smashing are carried out, and the fast absorption type water-absorbent resin is obtained after surface crosslinking is carriedout. According to the fast absorption type water-absorbent resin and the preparation method thereof, operation is easy, the manufacturing process is easy to control, and the production period is short; the obtained water-absorbent resin is high in absorption speed and small in reverse osmosis, particles obtained after water absorption are high in strength and loose, and the fast absorption type water-absorbent resin is especially suitable for composite core paper diapers and sanitary towels.

The invention discloses a centrifugation water treatment device. The centrifugation water treatment device comprises a cylinder housing (1), a centrifugation rotating cylinder (2), a water separator (4), a motor (5), a core filter screen (10) of the centrifugation rotating cylinder, a centrifugation rotating cylinder base plate (6), a water pump motor and a water pump (12), water inlet shaft water outlet holes (13), a water inlet shaft fixing nut (14), a water pump water inlet, a water inlet tank, a water inlet shaft driving disc (9), a water inlet driving shaft and a water inlet shaft water inlet hole. The centrifugation rotating cylinder and the water separator are integrated and the vertical section of the integrated structure is in a shape of I. Inlet water is fed into a water tank through the water pump motor and the water pump. The water inlet tank is communicated with the water inlet driving shaft with the water inlet shaft water inlet hole and a hollow channel. A water outlet end of the water inlet shaft is connected to the water separator. Outlet water from the water separator is located at a position 150mm or more away from the radius of the water inlet shaft. The motor drives the water inlet shaft driving disc and the water inlet shaft so that the centrifugation rotating cylinder is driven to carry out high speed centrifugation separation.

The invention discloses an anti-blocking intelligent valve positioner and an intelligent valve. The anti-blocking intelligent valve positioner comprises an air source purifying unit which is used for being connected with an air source; an anti-blocking electrical conversion unit which is connected with the air source purifying unit and used for controlling a valve actuator; a circuit control unit which is connected with the anti-blocking electrical conversion unit and used for transmitting a control signal to the anti-blocking electrical conversion unit; and a position feedback unit which is connected with the circuit control unit and used for detecting the actuation position of the valve actuator. The intelligent valve comprises the anti-blocking intelligent valve positioner and the valve actuator which is matched with the anti-blocking intelligent valve positioner. Intelligent valve positioning is realized, and internal blocking caused by pollution of the air source can be effectively avoided so that the anti-blocking intelligent valve positioner and the intelligent valve are particularly suitable for industrial field environment process control.

The invention discloses a method for detecting fluorobromomethane residues in bulk drugs. The invention provides a method for detecting bromofluoromethane, and relates to a method for determining bromofluoromethane residues in API, which adopts gas chromatography, takes DB-624 as a chromatographic column and carrier gas as helium, adopts a headspace sample injection method for sample injection, adopts a column temperature programmed heating method, and selects a hydrogen flame ionization detector as a detector. The method has the beneficial effects that the headspace temperature is reduced to25-30 DEG C for detection, fluorobromomethane detected at the temperature can be completely vaporized, so that fluorobromomethane is prevented from reacting, volatilization of fluorobromomethane during direct sample introduction is avoided, and the detection precision is guaranteed.

The invention provides an air injection sterilization system for empty bottle sterilization in filling equipment. The sterilization system comprises a sterilization medium gasification unit, a sterile hot air treatment unit and an air injection sterilization unit, wherein the sterile hot air treatment unit is communicated with the air injection sterilization unit through a gasification box; and the sterilization medium gasification unit is connected with the gasification box. According to the sterilization system, sterile hot air and a gasification and sterilization medium are mixed to form a high-temperature gasification and sterilization medium, and an inner wall of a container is sterilized by utilizing the high-temperature gasification and sterilization medium; the surface of the container is heated by utilizing high-temperature sterile hot air before the high-temperature gasification and sterilization medium is input, so that a sterilization effect is improved; and moreover, the high-temperature sterile hot air is continuously blown into the inner surface of a bottle body after sterilization operation is finished, and volatilization of the residual sterilization media is accelerated, so that the sterilization medium residues are controlled to be in a standard allowed range.

The invention belongs to the technical field of heat-resisting steel welding, particularly relates to a repairing method of a high-chromium martensite heat-resisting steel casting, and provides a welding and repairing method of a novel heat-resisting steel casting. The method comprises the main steps of defect treatment before welding, welding preheating, welding, heating after welding, and heat treatment after welding. By the adoption of the welding and repairing method, generation of weld cracks is reduced, the yield of welding and repairing is increased, the number of times of welding is reduced, and the repairing cost is reduced substantially.

The present invention relates to a process capable of utilizing organic solvent to make extraction and remove polycyclic aromatic hydrocarbon from the extract of ginkgo leaf. Said process mainly includes the following several steps: solvating, extraction and drying. As compared with existent technique, the polycyclic aromatic hydrocarbon content in the product can be effectively controlled so as to raise the quality of ginkgo leaf extract.

The invention discloses a prussian blue redox derived iron-based wave-absorbing material and a preparation method thereof, and belongs to the technical field of microwave absorbing materials. The iron-based wave-absorbing material is black gray powder and is composed of iron-based magnetic particles, and the components of the material can comprise Fe, FeO, Fe3O4, C and Fe3C. The effective absorption bandwidth of the wave-absorbing material can reach 5.44 GHz under the conditions that the filling degree is 40 wt% and the thickness is 1.5 mm, and the wave-absorbing material shows excellent wave-absorbing performance with low thickness and wide frequency band. The preparation method disclosed by the invention is simple and feasible, and comprises the steps of air oxidation, resin coating andcarbon thermal reduction. Air oxidation of the Prussian blue effectively ensures that the derivative product has higher magnetic phase content, and the effective control of Fe2O3 reduction degree, derivative phase composition and microstructure can be realized by accurately regulating and controlling the content of the phenolic resin. The moderate particle size and high magnetic phase content ensure high magnetic loss, and the existence of conductive iron, graphite and a multiphase interface ensures high dielectric loss and proper impedance matching.

The invention relates to a preparation method of lenvatinib and salt thereof. The adopted method for preparing the lenvatinib has the advantages that the process is simple, the cost is low, the purity is high, the single-purity content meets the regulations, and the industrial production is easier.

The invention relates to a preparation method of terminal hydrogen-containing silicone oil, which is characterized in that the terminal hydrogen-containing silicone oil is prepared by adopting high-viscosity methyl silicone oil and tetramethyldisiloxane as raw materials, and under the action of a linear phosphonitrile chloride composite catalyst H, the catalyst has a degradation effect on siloxane chain segments in methyl silicone oil chain segments, so that macromolecular polysiloxane is degraded into many micromolecular polysiloxane; meanwhile, the micromolecular polysiloxane is quickly subjected to condensation polymerization, the tetramethyldisiloxane participates in reaction and is terminated in time, the linear polysiloxane is redistributed, and the high-activity terminated hydrogen-containing silicone oil is prepared. According to the method disclosed by the invention, no obvious cyclosiloxane is generated, the content of low-boiling-point substances is extremely low, and only extremely trace short-chain polysiloxane is generated. The problems that in a traditional acid equilibrium catalysis process, the prepared target product is low in activity, low in effective component and excessive in residual low-boiling-point substances and ring bodies are well solved, and particularly, the limitation of international regulations such as reaction on the residual quantity of organic silicon ring body components such as D3, D4 and D5 in the product can be met.

The invention relates to a high-efficiency environmental-friendly polypropylene compatilizer and a preparation method thereof. 60-95 polypropylene, 0.1-10 initiating agent, 1-20 maleic anhydride, 0.5-15 comonomer and 0.1-7 antidegradant are put in a high-pressure reaction vessel by weight percent (the sum of weight percent of all the raw materials is equal to 100 percent.), the solid phase grafting reaction is performed to the mixture for 0.2-2 hours under the stirring action to obtain polypropylene initiation masterbatch, then 2-30 percent by weight of polypropylene initiation masterbatch and 70-98 percent by weight of pure polypropylene are mixed in a high-speed mixer at the room temperature, then the melting graft reaction is performed to the mixture on a double-screw extruder, and then the extrusion granulation is carried out to obtain the maleic anhydride grafted polypropylene compatilizer. Compared with the prior art, the method is simple and also suitable for the industrial production, and no solvent is required to be used, therefore, no harmful toxic matter emission exists, and meanwhile, the high-efficiency environmental-friendly polypropylene compatilizer has low residual quantity of acid anhydride and odor and is beneficial to environmental protection.

The invention relates to safety and processing of edible mushroom food, in particular to a pesticide application method capable of controlling prochloraz in the planting process of edible mushrooms. Limited spraying control of a prochloraz pesticide in the planting process of the edible mushroom raw material involves application time period, application dosage and application times. The provided pesticide application method has a good pesticide application effect, residues of the pesticide can be effectively reduced from the source of raw materials, and the residual quantity of prochloraz pesticides in various processing food of edible mushrooms meets the international standard. Sustainable and healthy development of the industry of edible mushrooms is promoted, and the method has remarkable economic benefits and social benefits.

The invention provides a method for controlling organic solvent residue in thymosin alpha 1PLGA microspheres. The method comprises the following steps: stirring a prepared thymosin alpha 1PLGA microsphere emulsion or multiple emulsion under normal temperature and normal pressure at a speed of 500-1200rpm for 3 hours; stirring the emulsion or multiple emulsion for 2-18 hours under the conditions of vacuum degree of -0.035MP to -0.096MP, a temperature of 26-35 DEG C and rotating speed of 50-800 rpm. The method for controlling organic solvent residue in thymosin alpha 1 microspheres provided by the invention is efficient, controllable, stable in process, safe, reasonable and capable of effectively controlling the residue problem of such organic solvents as dichloromethane and keeping the integral forms of the microspheres at the same time.

The invention relates to a refinement method of arotinolol hydrochloride and belongs to the field of chemical medicines. The refinement method is characterized in that crude arotinolol hydrochloride is added to a system containing ethyl acetate, methanol and pure water, subjected to an alkali recovery operation under a weak alkaline condition, then pulped and purified, and free alkaline arotinolol with higher purity is obtained; arotinolol forms salt in an alcoholic solution, and refined arotinolol hydrochloride is obtained. The method is simple to operate, the yield is relatively high, and industrial production is facilitated.

The invention discloses an artificially synthesized lima bean pod borer sex pheromone, which is prepared from the following components in percentage by weight: 18 to 21 percent of cis-11-tetradecaneenol acetic ester (Z11-14AC), 6 to 8 percent of cris-9-tetradecaneenol acetic ester (Z9-14AC), 6 to 8 percent of tetradecaneenol acetic ester (14AC), and 63 to 70 percent of n-hexane. The artificially synthesized lima bean pod borer sex pheromone is suitable for controlling domestic lima bean pod borers and has vary strong trapping capacity; the quantity of lima bean pod borer moths lured by each luring core is about more than 50 per day; the stability is good; the average effective period is as long as 30 days; the trapping efficiency is universally as high as 90 percent; the efficiency for preventing perfect insects from copulating through the functions of trapping and killing and disorientation is 50 percent; and the artificially synthesized lima bean pod borer sex pheromone can be used for forecasting, trapping and killing male moths and interfering copulations so as to achieve the effect of comprehensively controlling the domestic lima bean pod borers.

The invention discloses a fertilizer additive for promoting growth of angelica dahurica roots. The fertilizer additive is prepared from the following raw materials: zeatin, brassinolide, 6-benzylaminopurine, compound sodium nitrophenolate, diethyl aminoethyl hexanoate, tetramethyl glutaric aciduria, centipede, rhizoma dryopteris crassirhizomae, agrimonia pilosa, wedelia chinensis, frankincense, crinis carbonisatus, dragon's blood, barleria cristata, humifuse euphorbia herb, polyacrylate macroporous resin, a 15% (v / v) alcoholic solution, and sodium selenite. The product has the advantages of simple preparation, and low requirements to equipment, and can be industrially produced; the plant hormones can enhance stress resistance of angelica dahurica, inhibit bolting, promote root cell division and improve the yield and quality; the Chinese herbal medicines can reduce incidence rate of pest and disease damage of angelica dahurica, and improve the quality and economic benefits; with addition of the selenium-enriched components, the content of selenium in angelicae dahuricae is improved, and the functions of angelica dahurica for resisting oxidization, resisting aging, enhancing the resistance and protecting heart and cerebral vessels are enhanced; the neutral macroporous resin is used for adsorption, the additives have little amount, residues cannot be caused, slow release is effectively controlled, the utilization rate is high, and costs are saved.

The invention discloses a preparation method of cefazolin sodium with previous research quality. The preparation method is characterized by comprising the following steps: (1) adding a boron trifluoride-dimethyl carbonate solution into dimethyl carbonate; stirring and adding 2-sulfydryl-5-methyl-1,3,4-thiadiazole and 7-ACA (Acetic Acid) to react; after the reaction is finished, adding dimethyl formamide and dropwise adding hydrochloric acid; adjusting the temperature to 25 to 35 DEG C and reacting for 60 minutes; filtering and washing with acetone; drying in vacuum to obtain a TDA (Toluene Diamine) crude product; (2) preparing mixed anhydride from dichloromethane, tetrazolyl acetic acid, triethylamine and pivaloyl chloride; (3) adding the TDA crude product into a dichloromethane solvent; cooling and dropwise adding tetramethyl guanidine; dropwise adding the mixed anhydride to react, and purifying and refining a crystal through a low-temperature acetonitrile-water extraction process after extraction and crystallization. With the adoption of the preparation method provided by the invention, the moisture content of the product can be reduced and residues of the solvent can be reduced; the increasing of related substances can be effectively reduced, a freeze-drying technology is not used and the production efficiency is improved.

The invention discloses a method for a preparing low density polypropylene foam section or beads by two-step extrusion molding, which comprises the following steps that: expandable master batch is prepared from 30 to 80 portions of polypropylene, 10 to 40 portions of foaming agent, 0 to 15 portions of foaming accelerant, 0 to15 portions of dispersant and 0 to 10 portions of nucleating agent at a temperature below the decomposition temperature of the foaming agent and above a viscous flow temperature of the polypropylene; 20 to 99 portions of polypropylene with high melt strength, 0 to 70 portions of common polypropylene and 1 to 10 portions of expandable master batch are plasticizated and extruded together; supercritical gas is added to perform the blending of the plasticizated and extruded mixture; and the product obtained is made to generate foamcores in a foaming nucleation apparatus to form the section or beads finally. A chemical foaming agent is partially decomposed and foamedduring the plasticization and extrusion, so that the viscosity of fused mass is reduced, the dissolution and dispersion of the supercritical gas are facilitated, and a problem that a foam imploding islikely to happen in a secondary forming process so as to influence the quality and appearance of secondarily formed product is solved as the chemical foaming agent retained in molding beads can be decomposed and foamed again during the secondary processing.

The invention relates to a preparation method of maleic anhydride graft polypropylene wax, which is characterized by comprising the following steps: heating and melting polypropylene wax in a kettle by using a heating system and a mixer of a reaction kettle; mixing a maleic anhydride graft monomer with the addition of 1.5 to 8.0 of polypropylene in percentage by weight by controlling the mixing rate from 120 r / min to 250 r / min at reaction temperature from 100 DEG C to 250 DEG C; adding an initiating agent with the addition of 1 / 30 to 1 / 10 of the adding quantity of maleic anhydride and a graftactive agent with the addition of 1:3 to 2:1 of the weight of the maleic anhydride at reaction time from 0.5 hour to 10 hours, thereby completing the graft reaction of the maleic anhydride; and then cooling, pelleting or crushing maleic anhydride graft polypropylene wax so as to complete the preparing process of the maleic anhydride graft polypropylene wax. The invention also discloses a relativedevice. The preparation method of maleic anhydride graft polypropylene wax has the advantages of simple and reasonable technology, easy manufacture, low production cost, simplified product formula, and the like.