21results about How to "Improve melt fluidity" patented technology

The invention discloses a polypropylene composite material with high dielectric constant, high strength and high modulus as well as a preparation method and application thereof, and belongs to the technical field of polymer composite materials. According to the composite material, homo-polypropylene is used as a matrix and matched with a high-dielectric-constant composite filler, a modified reinforcing filler and a functional additive, and through reasonable component design and process optimization, the dielectric property and the mechanical property are synergistically improved. Wherein the barium titanate-graphene with the core-shell structure is used as a high-dielectric-constant composite filler, and an efficient dielectric path can be constructed in a polypropylene matrix; the epoxy resin modified chopped glass fiber can significantly enhance the mechanical strength and modulus of the material; the maleic anhydride grafted polypropylene effectively improves the interfacial compatibility of the filler and the matrix. The dielectric constant (10GHz) of the prepared composite material is greater than or equal to 8, the tensile strength is greater than or equal to 60 MPa, and the bending modulus is greater than or equal to 4000 MPa. The composite material has excellent dielectric properties and mechanical properties, and can be widely applied to the fields of electronic appliances, high-frequency communication, new energy automobiles and the like.

The present application relates to the technical field of resin, in particular to a conductive polypropylene composite material and a preparation method thereof.In view of the problems of poor processing fluidity, easy shear damage of conductive network and deterioration of mechanical properties caused by high filling of conductive filler in the prior art, the present application realizes the low volume resistivity, high melt flow rate and excellent mechanical toughness by the solid phase pre-coating technology, and effectively balances the conductivity, processability and strength.

The application belongs to the technical field of modified functional fibers, and particularly relates to a manufacturing method of high-bulkiness special-shaped hollow fibers. The low-crystalline polyester chip is obtained by modifying the polyester, and the functional components such as graphite and tourmaline are introduced, and the high-bulkiness special-shaped hollow fibers are prepared by using a special-shaped spinneret to melt and spin, so that the hollow degree and bulkiness of the fibers are effectively improved, good breaking strength is obtained, and the oxygen index is effectively increased.

The invention discloses a polyethylene composite material which comprises the following components in parts by weight: 69-86 parts of LDPE (Low-Density Polyethylene); 4.5 to 11 parts of microencapsulated ammonium polyphosphate; 3 to 5 parts of melamine polyphosphate; 2-4 parts of coupling agent surface modified magnesium hydroxide; and 0.5 to 1.5 parts of polyether modified polysiloxane. By selecting a compound flame-retardant system of microencapsulated ammonium polyphosphate / melamine polyphosphate / coupling agent surface-treated magnesium hydroxide, the flame retardance of UL-94 (2mm) V <-1 > or above can be realized under the condition of lower additive amount, and meanwhile, the defects of poor thin-wall processability and difficulty in dyeing of a flame-retardant polyethylene composite material in the prior art are improved; the method is suitable for preparing toys, household articles, simulation ornaments and the like.

This invention relates to the field of cable technology and discloses a composite cross-linked polyethylene insulated cable integrating signal and power transmission. The cable comprises, from the inside out, a composite core, an inner semi-conductive shielding layer, a composite cross-linked polyethylene insulation layer, and an outer semi-conductive shielding layer. The composite cross-linked polyethylene insulation layer is made by extruding and cross-linking raw materials containing the following parts by weight: 90-95 parts low-density polyethylene granules, 5.42-11.6 parts solid premix, and 0.7-2.0 parts liquid co-solution. The solid premix contains N,N'-m-phenylenebismaleimide and tetrabutyl titanate, and the liquid co-solution contains tetramethyltetravinylcyclotetrasiloxane and dicumyl peroxide. This invention anchors by constructing a coordination network, eliminates space charge and micropores in the insulation layer, improves withstand voltage, reduces signal attenuation, and ensures the long-term stability of the integrated power and signal transmission of the composite cable.

The application provides a low-temperature laminated co-extrusion adhesive film and a preparation method and a photovoltaic module, and relates to the technical field of photovoltaic devices.The low-temperature laminated co-extrusion adhesive film comprises a laminated EVA film layer and a TPO film layer, and the EVA film layer and the TPO film layer are fused at the interface part; the content of vinyl acetate in the EVA film layer is 15-40%, and the crosslinking degree of EVA is not less than 65%; the raw material for forming the TPO film layer comprises an ethylene-alpha olefin copolymer; the melt index of the ethylene-alpha olefin copolymer is 0.5-10 g / 10 min, and the melting point is 50-115 DEG C; the light transmittance of the low-temperature laminated co-extrusion adhesive film for light with a wavelength of 380-1100 nm is greater than 88%. The low-temperature laminated co-extrusion adhesive film provided by the application not only can realize low-temperature crosslinking, but also has high bonding performance with a base material and long-term anti-creep performance.

This invention belongs to the field of high-performance fiber composite materials technology, specifically relating to a method for preparing low-dielectric ramie fiber reinforced polycarbonate composite materials. First, ramie fibers with acrylate-type double bonds modified on their surface are prepared. Then, poly(styrene-isoprene) modified ramie fibers are prepared by copolymerizing the acrylate-type ramie fibers with styrene and isoprene. Next, polyphenylene ether and the poly(styrene-isoprene) modified ramie fibers are mixed evenly and added to a hopper. A polyphenylene ether / ramie fiber alloy is prepared using a twin-screw extruder. Finally, the polyphenylene ether / ramie fiber alloy is mixed evenly with polycarbonate and added to a hopper. A low-dielectric ramie fiber reinforced polycarbonate composite material is prepared using a twin-screw extruder. The molecular weight of the modified ramie fiber polymer is adjustable, as is the ratio of styrene to isoprene. The polystyrene segments effectively improve the compatibility between ramie fibers and polyphenylene ether, while the polyisoprene segments effectively enhance the toughness of the polyphenylene ether / ramie fiber alloy.

This application relates to a low-temperature resistant and creep-resistant hot-melt pressure-sensitive adhesive and its preparation method, belonging to the field of label adhesive technology. The raw materials for preparation include the following components in parts by weight: 35-45 parts of modified styrene-isoprene-styrene block copolymer, 10-15 parts of ethylene-vinyl acetate copolymer, 20-40 parts of hydrogenated petroleum resin, 15-30 parts of terpene resin, 8-18 parts of naphthenic oil, 0.5-1.5 parts of antioxidant, and 4-8 parts of polyisobutylene. This application introduces trifluoromethyl and epoxy groups simultaneously into the styrene-isoprene-styrene molecular chain through free radical grafting. The former imparts low surface energy to the adhesive layer, ensuring rapid wetting and initial tack at -20°C; the latter constructs a chemical network through latent ring-opening crosslinking, synergistically enhancing the physical entanglement of polyisobutylene, achieving simultaneous improvement in low-temperature rapid adhesion and high-temperature creep resistance, suitable for harsh environments such as cold chain labels.

This invention proposes a screw barrel accessory for high-speed, high- and low-pressure blown film extrusion equipment, applicable to blown film extruders. The screw includes a feed end and a discharge end at its two ends. Along the axial direction from the feed end to the discharge end, the screw sequentially features equal-depth screw groove sections, wavy gradient screw groove sections, a diamond sorting area, another wavy screw groove section, and a four-in, four-out multi-channel structure. This invention optimizes material plasticization, dispersion, flowability, and pressure control through a combination of wavy screw grooves, a dense tooth structure, a diamond sorting area, and a through-hole structure. The wavy and gradient screw grooves utilize a special structure to perform multiple shearing and kneading operations on the material. Simultaneously, the orderly arrangement of functional sections and the reasonable axial segment dimensions ensure smooth and stable screw operation, making it suitable for long-term continuous operation in high-speed, high- and low-pressure blown film production lines. This reduces the defect rate, improves overall production efficiency and economic benefits, and the integrated structural design enhances the overall strength of the screw.

The invention relates to the field of inorganic non-metallic materials, and discloses high-modulus aluminosilicate glass and a preparation method thereof.The preparation method comprises the steps that SiO2, Al2O3, CaO, MgO, La2O3, Y2O3, TiO2 and Li2O are fully mixed and then put into an alumina crucible, melting is conducted for 2 h at the temperature of 1580 DEG C, full clarification is conducted, it is guaranteed that bubbles do not exist, and uniform melting is conducted, so that molten glass liquid is obtained; pouring the molten glass into a mold for shaping and carrying out glass transition, and then carrying out heat preservation for 2-3 hours at the temperature close to the glass transition temperature; after heat preservation is finished, the heat preservation temperature is reduced to the room temperature at the speed of 2 DEG C / min, so that the internal stress of the glass is eliminated, and the high-modulus aluminosilicate glass is prepared; the problems that in the prior art, the balance of'high modulus', 'low liquid phase temperature 'and'good formability' is difficult to realize at the same time, and high-modulus glass is difficult to melt, poor in formability and strong in crystallization tendency are solved.

The application relates to the field of novel template materials, and particularly discloses a high-strength glass fiber modified polypropylene material building template and a preparation method thereof. The high-strength glass fiber modified polypropylene material building template is formed by injection molding of modified polypropylene master batches, the modified polypropylene master batches comprise the following raw materials in parts by weight: polypropylene master batches 50-80 parts, reinforcing agent 10-20 parts, composite flow improver 3-6 parts, and compatilizer 4-8 parts, wherein the reinforcing agent is glass fiber; and the preparation method comprises the following steps: firstly, mixing the raw materials, and then obtaining master batches through extrusion granulation; and then injection molding the master batches into the building template. The high-strength glass fiber modified polypropylene material building template has the advantages of high building template size stability.

The application discloses a low-heat-release, low-smoke-density flame-retardant polyamide material and a preparation method and application thereof, and belongs to the technical field of high polymer materials. The material comprises nylon resin 52-61%, a flame retardant 18-26%, a flame-retardant synergist 6-10%, a plasticizer 8-15%, a coupling agent 0.5-1.0%, an antioxidant 0.3-1.0% and a lubricant 0.3-1.0%, and is prepared through mixing, melt mixing, extrusion and granulation. The application effectively reduces the heat release and the smoke density of the polyamide material during combustion through the synergistic effect of the components such as the flame retardant, and meanwhile, good mechanical properties and processing stability are maintained, thereby meeting the demand of high-safety-grade application scenarios.

The invention discloses a high-temperature-resistant hot melt adhesive and a preparation method thereof, and relates to the technical field of hot melt adhesives. The high-temperature-resistant hot melt adhesive is prepared from the following raw materials in parts by weight: 25 to 35 parts of modified polyimide resin, 20 to 30 parts of modified benzoxazine resin, 8 to 12 parts of carboxyl-terminated nitrile rubber, 5 to 8 parts of C5 / C9 copolymerized petroleum resin, 3 to 5 parts of hydrophobic modified nano silicon dioxide, 1 to 2 parts of silicone powder, 0.5 to 1.0 part of antioxidant 1010, 0.3 to 0.8 part of zinc stearate and 0.05 to 0.1 part of tetrabutylammonium bromide. The high-temperature-resistant hot melt adhesive is scientific in raw material ratio, core resin is modified to improve heat resistance and compatibility, filler such as hydrophobic nano silicon dioxide is added to enhance performance, the preparation process is controllable, nitrogen protection is achieved in the whole process, moisture absorption is prevented through granulation and drying treatment, and a finished product is excellent in high-temperature resistance, good in comprehensive performance and good in storage stability.

This invention relates to a low-temperature, high-elasticity hot melt adhesive film and its preparation method. The hot melt adhesive film, by weight, comprises: 30-50 parts of modified SIS elastomer, 15-25 parts of polyamide resin, 8-15 parts of polycaprolactone diol, 5-10 parts of plasticizer, 8-15 parts of tackifier, 0.5-2 parts of antioxidant, and 0.3-1 parts of heat stabilizer. The modified SIS elastomer is methyl methacrylate-grafted modified SIS with a grafting rate of 8%-15% and a number-average molecular weight of 80,000-120,000. The polyamide resin has a melting point of 70-90℃ and a number-average molecular weight of 5,000-8,000. The hot melt adhesive of this invention has a melting point controlled at 70-90℃, allowing for low-temperature ironing at 90-100℃, effectively protecting temperature-sensitive fabrics such as silk and preventing high-temperature damage. Simultaneously, with the modified SIS elastomer as the core and the cross-linking effect of polycaprolactone diol, it possesses excellent elasticity and flexibility.

This invention relates to the field of toughening agent technology, specifically a high-transparency, cold-resistant toughening agent for polyester materials and its preparation method. By weight, it comprises 50-90 parts PET, 10-40 parts PETG, 1-10 parts high-transparency TPEE, 1-5 parts TPEE-g-MAH, 0.3-6 parts composite plasticizer, 0.1-0.5 parts nucleating agent, and 0.1-0.5 parts antioxidant. The preparation method includes: raw material drying, additive premixing, mixing the base material and additives, melt extrusion, and cooling pelletizing. This invention, through the synergistic effect of high-transparency TPEE and the specific compatibilizer TPEE-g-MAH, achieves nanoscale dispersion and strong interfacial bonding while solving the technical problem of "toughening inevitably reducing transparency" in traditional toughening materials. This results in a material with a low-temperature impact strength of 110-150 kJ / m² at -30°C, while maintaining a light transmittance ≥90% and a haze ≤2%. It is particularly suitable for PET products requiring high transparency and low-temperature impact resistance.

The invention discloses a temperature-resistant insulating mica powder / polypropylene composite film and a preparation method thereof, and belongs to the field of polymer film processing. The preparation method of the composite film comprises the following steps: (1) loading an olefin polymerization catalyst on the surfaces of mica powder particles, and carrying out in-situ polymerization on the prepared particles loaded with the olefin polymerization catalyst in a mixed component of alpha-olefin and propylene to prepare polypropylene / mica powder composite particles; and (2) blending polypropylene resin, the polypropylene / mica powder composite particles, a viscosity modifier and an auxiliary agent, granulating, and calendaring to obtain the polypropylene composite material. A firm polypropylene shell layer is formed on the surface of the mica powder, so that the interfacial compatibility of the mica powder and polypropylene is enhanced, good dispersion is realized, and the insulativity of the polypropylene is remarkably improved; meanwhile, the melt viscosity of polypropylene matched with the viscosity modifier is constructed, the molecular entanglement density of a composite system is remarkably improved, the movement of a polypropylene molecular chain is effectively limited, and the thermal stability of the composite film is improved.

This application discloses a composite high-flowability, high-conductivity conductive masterbatch and its preparation method, relating to the technical field of conductive materials. The masterbatch uses a fiber-forming polymer as a matrix, compounded with conductive carbon black, graphene, silver nanosheets, carbon nanotubes, and modified MXene nanosheets, along with coupling agents, dispersants, antioxidants, and lubricants. The modified MXene nanosheets are modified with an amino-functionalized modifier and a polysaccharide mixture of sodium alginate and agar. Amino grafting improves interfacial compatibility, while polysaccharide coating inhibits filler agglomeration and oxidation, optimizing the dispersion of the conductive filler in the matrix. This masterbatch constructs a multi-level continuous conductive network, significantly improving melt flowability, conductive stability, and mechanical properties, effectively solving the problems of easy agglomeration, poor flowability, and insufficient spinnability of traditional conductive masterbatches.

The present application relates to a kind of vanadium-aluminum alloy and its preparation method.The method comprises: after drying, vanadium oxide, slagging agent and aluminum-calcium alloy particles are mixed uniformly, the vanadium oxide is the mixture of vanadium pentoxide and di vanadium trioxide;Preheating;Take 10wt%-20wt% of mixed material to initiate in-situ composite thermal reduction reaction, form 1600℃-1950℃ high-temperature molten pool;The remaining material is pressed into the material ball with a diameter of 1.0-3.0 cm under 5-20 MPa pressure, and the obtained material ball is continuously added to the molten pool to maintain the temperature for reaction, while the reduction slag and alloy melt are separated;Cooling and deslagging to obtain vanadium-aluminum alloy ingot.The present application uses aluminum-calcium alloy particles as reducing agent, and utilizes its in-situ slagging function, combined with different valence vanadium oxide to control reaction heat, and continuous feeding process, realizes accurate control of composition, significant reduction of inclusions, efficient slag-gold separation, and the prepared vanadium-aluminum alloy has very low oxygen and nitrogen impurities, and the process flow is short, the cost is low, and it is suitable for aerospace-grade titanium alloy production.

The invention belongs to the technical field of cassette production, and particularly relates to a PVC product and a production method for injection molding of the PVC product, and the PVC product comprises the following components: 75-100 parts of PVC8 type resin, 24-32 parts of nano calcium, 2-5 parts of a TF-761T stabilizer, 0.7-1.3 parts of monoglyceride, 0.13-0.17 part of PE wax, 0.18-0.25 part of OPE wax, 0.3-0.7 part of dioctyl phthalate, 1.3-1.6 parts of a DL-801 auxiliary agent, and 1-3 parts of red masterbatch. According to the invention, a PVC product formula with specific components is constructed, and the technical problem that the appearance of a PVC injection molding product becomes white is effectively solved in combination with targeted mold surface sand blasting treatment and refined injection molding process control.

The invention discloses thermoplastic polyvinyl alcohol resin as well as a preparation method and application thereof. The thermoplastic polyvinyl alcohol resin comprises polyvinyl alcohol resin, a nucleating agent, a flow modifier and a thermoplastic agent. The thermoplastic polyvinyl alcohol resin has the characteristics of ultrahigh fluidity, high crystallization rate, stable film forming process and the like, and can be well applied to the field of ultrathin film preparation, the prepared thermoplastic polyvinyl alcohol ultrathin film is transparent and has few defects, and the thickness of the film can be as low as 10 microns or below.

The invention belongs to the technical field of crystal material preparation, and particularly relates to a method for growing sapphire crystals by a wide seed crystal edge-defined film-fed crystal growth method, which comprises the following steps of: firstly, preparing an Al2O3-based raw material through multi-step sintering, carrying out acid etching microstructuring treatment on R / M surface seed crystals, arranging an array type feeding seam mold above a crucible during charging, and carrying out vacuum replacement for three times, so as to obtain a sapphire crystal; a gradient temperature field is established through three-area independent temperature control, seeding is performed after melt is immersed into a mold, the growth process comprises seeding, shouldering and equal-diameter growth, wide diameter expansion and equal-diameter growth of crystals are realized by accurately controlling the pulling rate, the crucible rising speed and the three-section power of a middle heating area, and the crystals are automatically separated from the mold; and high-temperature, medium-temperature and low-temperature three-stage gradient annealing is carried out under argon protection to release stress and stabilize the structure, so that the transverse temperature gradient can be accurately controlled below 5 DEG C / cm, the problem of large temperature difference between the edge and the center during wide seed crystal growth is solved, and the stability of the solid-liquid interface shape and the uniformity of crystal growth are ensured.