55results about How to "High melt index" patented technology

The invention discloses a synthesis method of a high-melting-point polyester hot melt adhesive with better fluidity. The synthesis method comprises the following steps of: (1) carrying out esterification reaction on p-phthalic acid, m-phthalic acid, fatty dicarboxylic acid, ethylene glycol and C3-C6 diol under the action of titanate serving as a catalyst; and (2) adding a stabilizer and a surfactant to the products obtained in the step (1), and carrying out reduced-pressure condensation polymerization reaction to obtain a product, namely the high-melting-point polyester hot melt adhesive with better fluidity. The obtained polyester hot melt adhesive has good adhesion performance, better fluidity when used at high temperature, and excellent wet leveling property.

The invention discloses application of fatty acid modified hyperbranched polyester to plastic processing, belonging to the technical field of plastic processing aids. The application of fatty acid modified hyperbranched polyester comprises the steps of adding 0.5-3% of fatty acid modified hyperbranched polyester into plastics, uniformly mixing, extruding for granulating, and drying to obtain a modified plastic product. Plastics including polypropylene and the like are modified through mixing the plastics including polypropylene and the like and hyperbranched polyester at a high speed, and then, granulating by extruding through a double-screw extruder; the hyperbranched polyester is added into plastic matrixes, so that the processing temperature of the plastics can be remarkably lowered, the apparent property of the plastics is improved, and relatively high melting flowability is realized through relatively low additive amount; the decomposition temperature of the fatty acid modified hyperbranched polyester is relatively high and can be up to 290 DEG C; and the melt index of the modified plastics is remarkably increased, and meanwhile the dispersing performance of a filling system is improved.

A stretched PVA (polyvinyl alcohol) film and a preparation method for the same belong to the field of high polymer packaging materials, and aim to solve the problems of high energy consumption, low production efficiency, complicated process and special equipment production during processing with water serving as solvent in the prior art. The stretched PVA film is of a monolayer structure or three-layer structure, wherein the monolayer structure refers to B, and the three-layer structure sequentially refers to A/B/A or B/A/B. The method includes the steps of melting plasticization, extrusion granulation, and uniaxial stretching or biaxial stretching so that the stretched PVA film is obtained. The stretching melting range of the stretched PVA film is from 160 DEG C to 240 DEG C. The stretched PVA film meets national standard of biological degradability, and the degradation ratio is larger than or equal to 70%. The stretched PVA film is high in water resistance, and the swelling ratio of the stretched PVA film soaking in water at the temperature of 23 DEG C for 48 hours is smaller than or equal to 120%.

The invention relates to an adjustable performance irradiation crosslinking ethylene-tetrafluoroethene copolymer insulation material, which comprises the following components by mass part: an ethane-tetrafluoroethene copolymer, a cross-linking agent, N,N-'-dis[beta-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine, 1,3,5-tri(3,5-di-tert-butyl-4-hydroxyphenyl)isocyanuric acid, antimonony oxide, N, N'-ethylene bis-stearamide, and white oil, the cross-linking agent is made by mixing a component A and a component B, the mass ratio of the component A: the component B is 1: 0.1-10; the component B is at least one of triene propyl isocyanate, TMAIC, triallyl cyanate ester and TMAIC. The fluorine-containing polymer has the advantages of difficult self-polymerization, low volatileness, increased product stability, difficult volatileness, difficult self-polymerization, little smoke amount during the processing process, white sample color, non discolouring after irradiation and good product stability.

A magnesium halide adduct represented by the formula (I): MgX₂.mROH.nE.pH₂O, in which X is chlorine, bromine, a C₁-C₁₂ alkoxy, a C₃-C₁₀ cycloalkoxy or a C₆-C₁₀ aryloxy, with the proviso that at least one X is chlorine or bromine; R is a C₁-C₁₂ alkyl, a C₃-C₁₀ cycloalkyl or a C₆-C₁₀ aryl; E is an o-alkoxybenzoate compound represented by the formula (II): in which R₁ and R₂ groups are independently a C₁-C₁₂ linear or branched alkyl, a C₃-C₁₀ cycloalkyl, a C₆-C₁₀ aryl, a C₇-C₁₀ alkaryl or an C₇-C₁₀ aralkyl, the R₁ and R₂ groups are identical to or different from the R group; m is in a range of from 1.0 to 5.0; n is in a range of from 0.001 to 0.5; and p is in a range of from 0 to 0.8, is disclosed. A catalyst component useful in olefin polymerization, which comprises a reaction product of (1) the magnesium halide adduct, (2) a titanium compound, and optionally (3) an electron donor compound, is also disclosed.

Compositions for injection-molding of long, thin-walled, one-piece squeeze tubes include low-density polyethylene having a density less than about 0.925 g/cc and a melt index of at least about 50 g/10 minutes, and polypropylene having a high melt index greater than about 800 g/10 minutes, wherein the high melt index is attained by peroxide degradation of the polypropylene during melt processing. The compositions can also include a polymer that is miscible and compatible with low-density polyethylene and polypropylene for enhancing flow of the molding composition in the mold, the polymer having a glass transition temperature T_g of about −20 to −40° C., and/or metallocene resin having a density less than about 0.915 g/cc.

The invention discloses a wear-resistant, noise-reducing and thin-walled polypropylene composite material and a preparation method thereof. The wear-resistant, noise-reducing and thin-walled polypropylene composite material comprises the following raw materials in parts by weight: 59-79 parts of polypropylene; 8 to 16 parts of talcum powder; 6-10 parts of an elastomer; 4 to 12 parts of a functional master batch; 0-1 part of an antioxidant and 0-3 parts of other auxiliary agents; the ultrahigh molecular weight polyethylene in the functional master batch has unique self-lubricating, wear-resisting and impact-resisting properties, so that the wear-resisting, impact-resisting and other mechanical properties of the thin-walled polypropylene composite material are remarkably improved by adding the ultrahigh molecular weight polyethylene; the functional master batch takes high-fluidity polypropylene as a carrier; when the polymer system is extruded from a twin-screw extruder or an injection molding machine, nano silicate can be well and uniformly dispersed into a composite material system, a unique chain layer structure of the nano silicate plays a role in dissipating sound transmission,and meanwhile, the nano silicate and ultra-high molecular weight polyethylene in the functional master batch generate a synergistic effect to ensure that the prepared composite material has excellentsound absorption and noise reduction functions.

The invention discloses a graphene printing material and belongs to the technical field of 3D printing materials. The graphene printing material comprises, by weight, 5.5-7.6 parts of graphene, 24.6-30.4 parts of waste plastic, 34.2-38.2 parts of polylactic acid, 11.6-22.7 parts of potassium tripolyphosphate, 18.3-24.5 parts of adipate, 9.2-17.3 parts of a special synthetic agent, and 5.2-9.5 parts of a starch synthetic agent. The graphene printing material has high tensile strength, high bending strength and high notch impact strength and is high in thermal deformation temperature and melt index. A product produced through 3D printing technology is high in quality, has high anti-impact property and is high in strength. The material has wide market prospect.

The invention relates to a high-melt-index halogen-free flame-retardant polypropylene material and a preparation method thereof. The high-melt-index halogen-free flame-retardant polypropylene materialcomprises the following components in parts by weight: 60 to 80 parts of polypropylene base material, 0.1 to 20 parts of pyrophosphoric acid piperazine, 0.1 to 20 parts of surface modified ammonium polyphosphate, 0 to 10 parts of melamine or salt thereof, 0.1 to 3 parts of coupling agent, 0.1 to 3 parts of compatilizer, 0.1 to 3 parts of antioxygen, 0.1 to 3 parts of light stabilizer, and 0.1 to1 part of white oil. The preparation method comprises the steps of weighing the raw materials in parts by weight, premixing the dried polypropylene base material and the dried white oil in a dual-motion mixer for 5 to 8 minutes, and uniformly mixing; adding the pyrophosphoric acid piperazine, the surface modified ammonium polyphosphate, the melamine or the salt thereof, the coupling agent, the campatilizer, the antioxygen and the light stabilizer according to the parts by weight, and continuously mixing for 5 to 8 minutes so as to obtain a uniform mixture; and putting in a charging hole of a double-screw extruder, mixing and extruding the materials through a screw rod, and extruding from a die head. Compared with the prior art, the halogen-free polypropylene material provided by the invention can effectively solve the problems such as high pollution of a traditional triazine carbon-forming agent system, poor compatibility of a flame retardant and a matrix, and low flame retardant efficiency.

The invention discloses a polypropylene material with high appearance performance, high performance and low emission for automobile interior and exterior decoration and a preparation method of the polypropylene material. The polypropylene material is prepared from components in percentage by weight as follows in a composition formula: 30.8%-89.4% of a PP matrix, 0-25% of a flexibilizer, 10%-30% oftalcum powder, 0-10% of PP L-Modu, 0.6%-2.2% of an antioxidant and 0-2% of a scraping assistant. The polypropylene material has the following beneficial effects: 1, the problems of appearance such astiger skin and the like frequently occurring to parts such as a dashboard are solved by the characteristics of high liquidity and low crystallization temperature of PP L-Modu; 2, by adding PP L-Modu,the injection temperature is reduced, and properties such as emission and the like can be improved; 3, PP L-Modu can effectively improve liquidity of the material and reduce the crystallization temperature of the material, processing windows of the material are increased, and the production requirements of bumpers and other small parts for thin walls can be met.

The invention belongs to the technical field of high polymer materials and discloses a preparation method and application of hyperbranched polyester for improving the flowability of polypropylene. The preparation method of hyperbranched polyester comprises the following steps: adding a dicarboxylic acid and trihydric alcohol into a flask; after carrying out air replacement 2-3 times under the protection of protective gas, adding an organic tin metal catalyst; heating to a set reaction temperature; under the condition that the protective gas keeps flowing moderately, carrying out reaction, and separating out water produced in reaction; and at the end of the reaction, cooling the obtained product to room temperature, thereby obtaining a reaction product. Hyperbranched polyester prepared by using the method disclosed by the invention is used as an additive. The synthesis method of hyperbranched polyester, provided by the invention, is simple in process and low in cost and the prepared hyperbranched polyester can significantly improve the melt index of polypropylene.

The invention discloses a conductive thermoplastic powder which comprises the following components counted in weight portions: 20 to 25 portions of conductive master batch, 10 to 15 portions of grafting sticky master batch and 47 to 74 portions of accessory ingredient. In the invention, specific conductive carbon black and polyethylene powder are uniformly mixed by a high mixer and are pelletized by a double screw extruder for standby; the prepared grain material and other compounds are pelletized by the double screw extruder and ground into powder; and the prepared conductive thermoplastic powder improves the MFR of a composite, has better flatting performance, can reduce the processing energy consumption and has an excellent adhesive attraction under the situation of ensuring high sticking intensity. The conductive thermoplastic powder can be used for coating the surface of metal pipes, combines the advantages of plastic with metal pipe organically, can be applied to the underground environment of coal ores, prolongs the service life of the pipes and simultaneously does not reduce the intensity of the pipes and reduces the investment on the coal ore enterprises.

The invention discloses a conductive foamed polypropylene material and a preparation method thereof. The conductive foamed polypropylene material is prepared from a conductive foamed polypropylene prefabricated material and a foaming agent, the adding amount of the foaming agent accounts for 2-5% of the weight of the conductive foamed polypropylene material, and the conductive foamed polypropyleneprefabricated material is prepared from the following components in parts by weight: 54 to 86.8 parts of polypropylene, 8 to 15 parts of conductive carbon black, 0 to 10 parts of a toughening agent,5 to 20 parts of a filler, 0.1 to 0.5 part of an antioxidant and 0.1 to 0.5 part of a processing aid. According to the invention, a micro-foaming process is applied to a conductive modified polypropylene material, conductive carbon black is added to form a cross-linked network structure, and based on the formation of foam holes in the material, the conductive carbon black dispersed in a base material is gathered in the base body intensively in volume, so that the effective and compact conductive path is formed in the material so as to reduce the use amount of the conductive additive of the material, effectively and significantly reduce the surface resistance of the material, improve the conductive effect of the material and reduce the cost of the material; and the preparation process is simple, and the prepared polypropylene material is excellent in performance.

Provided is a PC-ABS alloy for a thin-wall product and a preparation method of the thin wall product PC-ABS alloy. The PC-ABS alloy comprises, by weight, 30-90 parts of PC, 15-60 parts of ABS, 2-20 parts of LLDPE and 0.5-10 parts of lubricant. Through adding the flow modifier compounding linear low density LLDPE and lubricant in the PC-ABS material, the method hugely increases the melting point of the PC-ABS alloy, thus making the die stamping of the injection molding process of thin-wall product smooth, making the product fusion connection strength high and not prone to break.

The invention relates to the technical field of wrapping films, and discloses a metallocene linear low-density polyethylene reinforced wrapping film manufacturing process. The process is characterizedin that mLLDPE-a and mLLDPE-b in a wrapping film structure are two metallocene linear low-density polyethylene with different melt indexes respectively, are used for improving the strength, and are used for adjusting melt index of blended material according to different equipment characteristics; an mLLDPE-c is metallocene linear low density polyethylene with a high viscosity mark and is used forimproving the viscosity of a finished product film, polyethylene is thermoplastic resin prepared by polymerizing ethylene and also comprises a copolymer of ethylene and a small amount of alpha-olefinin industry, and the polyethylene is odorless, nontoxic and wax-like in hand feeling, has excellent low-temperature resistance (the lowest use temperature can reach minus 100 DEG C to minus 70 DEG C)and good chemical stability, can resist erosion of most acids and alkalis (does not resist acids with oxidizing properties), is insolubility in common solvents at normal temperature, and has low water absorption and excellent electrical insulation, and the layer A is the mLLDPE-a + mLLDPE-b + LLDPE; the B layer is mLLDPE-a + mLLDPE-b + LLDPE, the C layer is mLLDPE-a + mLLDPE-b + LLDPE, the D layer is mLLDPE-a + mLLDPE-b + LLDPE, and the E layer is mLLDPE-c.

The invention relates to a high-softening-point ultra-high-molecular-weight polyethylene alloy material and a preparation method thereof, and is used for mainly solving the problems that a conventional polyamide (PA)/(ultra) high-molecular-weight polyethylene (UHMWPE) plastic alloy material is low in vicat softening point, is not resistant to high temperature and slow in rebound velocity. The alloy material comprises the following components by the weight percentage: 40-80% of ultra-high-molecular-weight polyethylene resin, 30-60% of nylon resin, 2-15% of an inorganic nanomaterial, 0-10% of a compatibilizer, 0.5% of a chain extender, and 6-12% of an ultra-high-molecular-weight polyethylene maleic anhydride graft material. The high-softening-point ultra-high-molecular-weight polyethylene alloy material improves the vicat softening point and the rebound velocity, is resistant to high temperature, can meet the requirements of high temperature, high pressure and strong friction, reduces the product producing cost and is beneficial for extrusion molding.

The invention discloses a high-bright-black, scratch-resistant and thin-walled polypropylene composite material and a preparation method thereof. The high-bright-black, scratch-resistant and thin-walled polypropylene composite material comprises the following raw materials in parts by weight: 63.4-79.8 parts of polypropylene, 10-20 parts of talcum powder, 6-10 parts of an elastomer, 1-3 parts of high-bright-black masterbatches, 0.2-0.6 part of a scratch-resistant auxiliary agent, 0-1 part of an antioxidant and 0-3 parts of auxiliary agents. According to the invention, ultrafine-particle-size carbon black in the high-bright-black masterbatches has an extremely strong coloring effect, and a hyperdispersant has a strong dispersion effect, so the polypropylene composite material achieves stable, uniform and high-bright-black aesthetic effects; meanwhile, through introduction of an organic silicon polymer with a special structure, the polypropylene composite material has good scratch resistance; under the condition of adding a small amount of the organic silicon polymer, compared with a traditional silicone scratch-resistant auxiliary agent, the organic silicon polymer has long-acting property and durability, can significantly improve the scratch resistance of the surface of the polypropylene material and reduce the surface friction coefficient of the polypropylene material, and canplay a synergistic role with polyethylene wax in the high-bright-black masterbatches to improve the scratch resistance of the polypropylene composite material.

The invention discloses a special material for a new-energy battery shell and a preparation method thereof. The special material for the new-energy battery shell comprises the following raw materialsin parts by weight: 100-135 parts of polypropylene, 5-12 parts of niobium pentoxide, 6-15 parts of sodium tetrachloropalladate, 8-14 parts of modified chabazite powder, 8-12 parts of modified lignin and 2-6 parts of xylitol. The special material for the new-energy battery shell has excellent flame retardance, good mechanical properties, corrosion resistance and cold resistance, a high melt index and good fluidity and is easy to process.

The invention discloses a method for preparing PNT (para nitro toluene) copolyester hot melt adhesive used for film manufacturing. The method comprises the following steps: (1) terephthalic acid, isophthalic acid, neopentyl glycol and 1,3 propylene glycol have an esterification reaction under the action of titanium catalysts; (2) stabilizers and anti-oxydants are added to products of the step (1), so a pressure-reduction condensation polymerization reaction is conducted, and the PNT copolyester hot melt adhesive which is used for film manufacturing and is high in crystallization speed and short in opening time can be obtained.

The invention discloses a high-impact glass fiber composite for 3D printing and belongs to the technical field of preparation of materials for 3D printing. The high-impact glass fiber composite for 3D printing is prepared from the following raw materials in parts by weight: 85-123 parts of glass fibers, 24-33 parts of waste plastic, 11-15 parts of acetylglutamine, 4-7 parts of metaldehyde, 7-11 parts of polyurethane, 8-10 parts of alkyd resin, 6-12 parts of zinc acrylate resin, 5-9 parts of high chlorinated polyethylene resin, 9-16 parts of stearic acid, 4-7 parts of polyacrylamide, 12-20 parts of a specific synthetic agent and 8-12 parts of a flame retardant. The high-impact glass fiber composite for 3D printing has the characteristics of high tensile strength, bending strength and notch impact strength, high heat deformation temperature, high melt index and the like, and a product printed with a 3D printing technology has high quality, high impact resistance and high strength, and has broad market prospect.

The invention belongs to the technical field of polymer synthesis and specifically relates to a preparation method of a polyethylene special material for vehicle decorative non-woven fabric back glue. On a tubular E-method high pressure polymerization process device, appropriate initiator and molecular weight regulator are selected, and ethylene feed mainstream and sidestream are added in appropriate proportion, and appropriate polymerization pressure and polymerization temperature are selected. Then, vehicle decorative non-woven fabric back glue special polyethylene with high melt index (22-32g/10min under conditions of 190 DEG C and 2.16 kg) and medium-low density (0.920-0.934g/cm<3>) is developed and prepared. The method is simple and is easy to operate.

The invention discloses a crosslinking sensitizer for a fluorine-containing polymer. The crosslinking sensitizer is characterized by being formed by mixing a component A and a component B according to the mass ratio of 1 to 0.1-10; the component A conforms to the structural formula (1) (please see the formula in the specifications), wherein X represents vinyl or allyl or methylallyl or propargyl, n ranges from 2 to 15, and the weight-average molecular weight of X ranges from 600 to 5000; the component B is at least one of triallyl isocyanate, trimethyl allyl isocyanate, triallyl cyanate and trimethyl allyl cyanate. At a machining temperature, the fluorine-containing polymer is not prone to self-polymerization, low in volatility and not prone to volatilization or self-polymerization, and product stability can be improved; it is found in the machining process that a sample of the crosslinking sensitizer is small in smoke amount, white and luster in color, free of after-radiation color changes and quite high in product stability in the use process.

The invention discloses a graphene 3D printing material with a high melt index and belongs to the technical field of preparation of materials for 3D printing. The graphene 3D printing material with the high melt index contains the following raw materials in parts by weight: 5.4-7.7 parts of graphene, 25-31 parts of waste plastics, 35-40 parts of polylactic acid, 12-23 parts of sodium hexapolyphosphate, 18-24 parts of propylene glycol methyl ether acetate, 9-18 parts of specific synthesizer and 5-9 parts of starch synthesizer. The graphene 3D printing material disclosed by the invention has the characteristics of high tensile strength, flexural strength and notch impact strength, high thermal deformation temperature and melt index, and the like; and products printed through a 3D printing technology are high in quality, high in impact resistance and high in strength, thereby having a broad market prospect.