405results about How to "Improve melt index" patented technology

The invention provides the usage of using the benzoic acid stannous as catalyst. The invention solves the problem that polymerization rate of current catalyst in lactic acid and glycolic acid is slow. The benzoic acid stannous is the catalyst used for preparing low-molecular polymer lactic acid with lactic acid dewatering; benzoic acid stannous is the catalyst used for preparing lactide with low-molecular polymer lactic acid cracking; benzoic acid stannous is the catalyst used for preparing polylactic acid with lactide polymerizing; benzoic acid stannous is the catalyst used for preparing low-molecular polymer glycolic acid with glycolic acid dewatering; benzoic acid stannous is the catalyst used for preparing glycolide with low-molecular polymer glycolic acid cracking; benzoic acid stannous is the catalyst used for preparing poly-glycollide with glycolide polymerizing. The benzoic acid stannous is the catalyst used for polymerizing glycolide, lactide and epsilon-caprolactone. Using the benzoic acid stannous is low content, high productivity, high product purity, low temperature and good repeatability.

A high-lustre polypropylene material and its production are disclosed. The material consists of polypropylene resin 100 proportion, filler nanometer calcium carbonate 25-35 proportion, dispersant 0.5-1.5 proportion, cross-linking agent diisopropylzene 0.1-0.5 proportion, beta-crystal nucleation agent 0.1-0.5 proportion, and antioxidant 0.1-0.5 proportion. It costs low, has better toughness and surface brightness on surface.

The invention discloses a polycarbonate composite material and a preparation method thereof. The polycarbonate composite material is composed of the following components in parts by weight: 50-95 parts of aromatic polycarbonate, 5-50 parts of fatty group polycarbonate, 0.1-0.3 part of main antioxidant, 0.1-2 parts of auxiliary antioxidant, 0-10 parts of inorganic powder and 0-5 parts of plasticizer. The preparation method comprises the following steps: 1) respectively drying the aromatic polycarbonate and fatty group polycarbonate at 50-120 DEG C for 4-30 hours; 2) mixing the components; and 3) carrying out melt extrusion on the mixture in the step (2) through a double screw extruder, and granulating. Under the condition of not adding any compatilizer or elastomer, the polycarbonate composite material has the advantages of high notch impact strength and favorable processing flowability, and is partially biodegradable. The fatty group polycarbonate has flexible and adjustable chemical structure and molecular weight, and can be prepared into a series of polycarbonate composite materials according to practical application demands.

The invention discloses a method and equipment for preparing impact polypropylene. The method comprises the following steps of carrying out polymerization reaction in the presence of a Ziegler-Natta catalyst, and carrying out gas-phase polymerization on propylene or propylene and alpha-olefin in the presence of a catalyst containing first external electron donors to obtain a polymer A; adding a second external electron donor to be premixed with the polymer A; and carrying out gas-phase polymerization on propylene or propylene and alpha-olefin in the presence of a material after premixing to obtain a polymer B. By adopting the method provided by the invention, a polypropylene product comprising a continuous phase and a rubber phase is finally obtained by adopting the two kinds of external electron donors with different hydrogen modulation sensitivity and controlling the addition mode of the second external electron donor with weak hydrogen modulation sensitivity; and the product has higher melt index and higher impact strength and has better impact resistance while keeping higher melt fluidity.

The invention provides a polymerization process of high impact resistance polypropylene. The polymerization process specifically comprises the steps that (1) a first external electron donor with excellent hydrogen sensitivity is added into a first-stage loop propylene homopolymerization reactor, so that a propylene homopolymer with a high melt flow rate is obtained at lower hydrogen concentration;(2) a second external electron donor which contributes to the improvement of the isotacticity of polypropylene is added into a second-stage loop reactor, so that high-crystallized polypropylene is prepared in the stage to enable a material to obtain excellent rigidity; and (3) a third external electron donor is sprayed on the surface of the polymer generated in the second stage, so that the thirdexternal electron donor enters a gas phase reactor of the third stage along with the polymer, so that an impact resistant propylene polymer with uniform sequence distribution and high content is obtained in the stage.

A catalyst active ingredient, its production and catalyst containing it are disclosed. The ingredient consists of magnesium 12.0-18.0 proportion, titanium 4.0-8.0 proportion, alkoxy 1.1-11.0 proportion, silicon 0.5-2.5 and halogen 55.0-75.0 proportion. The process is carried out by preparing magnesium alcoholate slurry, reacting it with electron, pre-carried titanium reacting and carried titanium reacting. It has higher catalytic activity and melt index, better physical mechanical and copolymer performances and hydrogen selectivity, and homogeneous grain distribution.

The invention discloses a formula system for low-shrinkage-rate stainless steel powder injection molding feedstock and a formula system for a molding agent thereof. The formula system for the molding agent of the low-shrinkage-rate stainless steel powder injection molding feedstock comprises stearic acid, an antioxidant, paraffin, high-density polyethylene, polyethylene-acetate, high molecular polymer wax and polyformaldehyde, wherein mass percentage of polyformaldehyde is not greater than 90%. The invention further discloses a formula system for low-shrinkage-rate stainless steel powder injection molding feedstock comprises stainless steel powder and the formula system of the molding agent. The formula system for low-shrinkage-rate stainless steel powder injection molding feedstock and the formula system for the molding agent thereof disclosed by the invention realize relatively high powder loading amount and relatively high shrinkage rate, have relatively high melt index as well as excellent blank strength and molding property, and are especially suitable for manufacturing and molding large-specification thin-wall products.

The invention discloses high-strength and high-tenacity polypropylene composite materials. The high-strength and high-tenacity polypropylene composite materials solve the problems that existing polypropylene is poor in tenacity and poor in strength. The high-strength and high-tenacity polypropylene composite materials are formed by the following components, by weight, 35-75% of polypropylene, 10-40% of calcium carbonate, 8-25% of calcium sulfate whisker masterbatch, 0.1-2% of coupling agents, 2-8% of compatilizer, 0.3-4% of lubricating agents and 0.2-0.8% of antioxygen. The invention further provides a preparation method of the high-strength and high-tenacity polypropylene composite materials. According to the preparation method of the high-strength and high-tenacity polypropylene composite materials, through the mode that calcium sulfate whiskers are made into masterbatch, the calcium sulfate whisker masterbatch is added to plastics to carry out co-extrusion mixing with the plastics and the like, thus, compared with powdery whiskers, material preparation can be evener and controllable, the problem that material preparation of the calcium sulfate whiskers is difficult is solved, meanwhile, the calcium sulfate whiskers are made to have better dispersity in plastic substrate, and the surfaces of products are smoother.

The invention provides an ABS/PET alloy material with high performance and low cost. 30-95 percent of ABS and 5-70 percent of recovery PET multipolymer by weight are premixed with complex antioxidizer which is 0.1-1 percent of the total weight of the material, and the mixture is put into a double-screw extruding machine for pelleting under a normal machining condition to obtain the ABS/PET alloy material. The PET used in the invention is an unformed PET multipolymer prepared from common PET and dihydric alcohol through the modification by copolymerization, and the unformed PET multipolymer is evenly dispersed in an ABS base material to form a dispersing phase area with small size and good compatibility, therefore, the obtained alloy material not only obviously improves the tensile-strength, the rupture tensile stretch and the gap impact strength of the ABS, but also remarkably increases the melt index; in addition, the invention does not use compatilizer and impact modifying agent with high price, but uses the recovery PET multipolymer with low price, thereby greatly reducing the cost, being widely applied to industries of automobiles, electronic and electric appliances, household electric appliances, precise machinery, building materials, and the like, and having obvious economic and social benefits.

The invention provides an aluminum foil openable cover and a preparation method thereof, and belongs to the technical field of can-type package. The aluminum foil openable cover comprises a metal cover body and an aluminum foil packaging film, wherein an article taking-out hole is formed in the metal cover body; the aluminum foil packaging film is used for blocking the article taking-out hole, and is sequentially provided with a protection layer, a blocking layer and a heat-seal layer from top to bottom; a gloss oil layer is used as the protection layer; an aluminum foil layer is used as the blocking layer; and the heat-seal layer consists of 10 to 20 weight percent of polybutylene, 40 to 60 weight percent of high-density polyethylene (HDPE) and 20 to 40 weight percent of metallocene polyethylene. The prepared aluminum foil openable cover is high in sealing performance and high in openability.

The invention discloses a polycarbonate resin compound and a preparation method thereof. The polycarbonate resin compound comprises the following components: 80 to 99.5 portions by weight of polycarbonate resin or polycarbonate resin alloy, and 0.5 to 20 portions by weight of organic silicon rubber. The preparation method comprises the following steps: (1) premixing, namely, adding the polycarbonate resin or the polycarbonate resin alloy and the organic silicon rubber into a mixer, and premixing the materials for 1 to 6 minutes with the rotating speed of 100 to 800 revolutions per minute at the mixing temperature of between 20 and 50 DEG C; and (2) squeezing granulation, namely adding the premixed materials into a double-screw extruder to carry out squeezing granulation, wherein the temperature of each section of the double-screw extruder is between 180 and 300 DEG C during extrusion, the rotating speed of screws is 100 to 500 revolutions per minute, and the rotating speed of a feeder is 10 to 60 revolutions per minute. The polycarbonate resin compound prepared by the method has good liquidity, thermal stability and impact resistance, and belongs to the field of polymer material modification.

The invention belongs to the technical field of high polymer materials, and particularly relates to a melting-expanded electret antibacterial master batch and a processing technology and application thereof. The master batch comprises the following components in parts by weight: 70-190 parts of polypropylene, 1-2 parts of a peroxide, 1-2 parts of an antioxidant, 1-2 parts of a plasticizer, 1-2 parts of a lubricant, 1-2 parts of an electret material and 1-2 parts of an antibacterial agent. The master batch has multiple functions, molecular weight breakage is caused by adding peroxide, the meltindex of the PP material is increased, the flowing property of the material is improved, and the material is easier to form. The electret material is added, so that the material can generate static electricity to adsorb viruses and particulate matters in air, and due to the antibacterial and bactericidal material in the material, the viruses and the particulate matters can be adsorbed to kill germs. Only a small amount (about 4%) of the material is added into a medium-melt-index fiber-grade PP raw material (only non-woven fabric can be used in the past), and the material can be applied to a melt-blown material, so that the problem of shortage of the melt-blown material is solved.

The invention provides a low-cost and stress cracking resistance flame-retardant ABS (Acrylonitrile Butadiene Styrene) resin composite material and a preparation method of the ABS resin composite material. The ABS resin composite material consists of 250-500 parts of ABS resin A, 250-500 parts of ABS resin B, 200-250 parts of a fire retardant, 3-6 parts of an antioxidant and 5-8 parts of a lubricating agent. The melt index of the ABS resin composite material prepared by the preparation method of the ABS resin composite material disclosed by the invention is greater than 15g/10min, so that processing and forming are facilitated; and the ABS resin composite material has the advantages of good impact and tensile properties, excellent toughness and good flame retardant property, so that the ABS resin composite material is beneficial to guarantee that no harmful effects such as easy breakage, fracture and the like on electrical components occur in subsequent processes of assembling, tapping and the like.

The invention relates to a biological nylon material and a preparation method thereof, belonging to the field of synthesis of the high polymer material--nylon. The biological nylon material is prepared from the following components by mol: 7.4 to 9.0 mol of aromatic diacid, 11.0 to 12.6 mol of sebacic acid, 19.0 to 19.7 mol of aliphatic diamine, 0.035 to 0.05 mol of a nucleating agent, 0.015 to 0.03 mol of a catalyst and 220 to 300 mol of a solvent. Compared with the prior art, the invention has the following advantages: reaction steps are simple; the synthesized biological nylon has a high melt index and good fluidity, discharging of the biological nylon is convenient, direct traction and granulation can be realized after cooling, and the biological nylon is convenient to package, transport and store and has ideal mechanical properties; moreover, the prepared nylon has a melting point far lower than the melting point of common nylon and can realize blending with more low-melting-point polymers, so the application scope of the nylon is broadened.