13results about How to "Increased flexural modulus" patented technology

The application discloses a glass fiber reinforced polypropylene composite material and a preparation method thereof. The glass fiber reinforced polypropylene composite material contains the following raw materials in percentage by mass: modified copolymerized polypropylene 45.5%-75%, glass fiber 10%-26%, toughening agent 3%-9%, coupling agent 3.5%-12.0%, compatibilizer 4%-7% and stabilizer 0.4%-0.6%; wherein, the coupling agent contains at least two primary amines, and the modified copolymerized polypropylene contains aldehyde groups. The glass fiber reinforced polypropylene composite material provided by the application forms a macromolecular network structure with reversible cross-linking through mutual cooperation between the raw materials, significantly improves the notched impact strength of the glass fiber reinforced polypropylene composite material on the basis of improving the strength and low-temperature resistance of the glass fiber reinforced polypropylene composite material, and has excellent comprehensive performance.

The application discloses a nylon composition and a preparation method and application thereof, and belongs to the technical field of polymer engineering plastics; the nylon composition provided by the application comprises the following components in parts by mass: 73-92 parts of PA12 resin, 3-22 parts of a toughening agent, 0.3-1.8 parts of lignosulfonate, and 0.1-1.2 parts of polyvinylpyrrolidone; the toughening agent comprises maleic anhydride grafted SEBS. The product prepared by the application has high light transmittance and excellent bending modulus and impact strength; meanwhile, the preparation method of the nylon composition is simple in operation and is beneficial to actual production.

This invention relates to the field of propylene polymerization, and discloses a polypropylene, its preparation method, and its applications. The polypropylene has a molecular weight distribution of 6-20; at 230℃, a melt index of 0.1-10 g / 10 min with a loading of 2.16 kg; an isotactic index ≥97%; a fraction with a weight-average molecular weight M ≥ 5 million g / mol containing ≥1 wt%, a fraction with 1000 g / mol < M < 50000 g / mol containing 5-30 wt%, a fraction with 50000 g / mol ≤ M < 5 million g / mol containing 60-90 wt%, and a fraction with M ≤ 1000 g / mol containing <1 wt%; a melt strength ≥0.4 N at 230℃; a heat distortion temperature ≥95℃; and a flexural modulus ≥1800 MPa. This polypropylene exhibits high isotacticity, a wide molecular weight distribution, high flexural modulus, and also high melt strength and heat resistance.

The utility model discloses a kind of tensile tear-resistant reinforced CPVC cable protection pipe, it includes pipeline, the inside fixed connection of pipeline has CPVC resin, the inside fixed connection of CPVC resin has nano calcium carbonate, the inside fixed connection of nano calcium carbonate has calcium-zinc stabilizer.Through the above structure, there is a layer of CPVC resin in pipeline, the smooth surface of CPVC resin can reduce the contact area of cable and pipe wall, reduce the local temperature rise caused by heat generation due to friction, while the air gap between pipe wall and cable is more uniform, beneficial to the heat dissipation of cable operation, prolong the service life of cable, there is also a layer of nano calcium carbonate in it, nano calcium carbonate particle size is usually 10~100nm, specific surface area is large and dispersibility is good, uniformly filled in CPVC resin matrix can form "rigid particle reinforcing effect", the tensile strength of inner wall layer is improved by 20%~30%, and bending modulus is improved by 15%~25%.

The invention relates to the field of propylene polymerization, and discloses a preparation method of polypropylene, polypropylene and application. The method comprises the following steps: S1, in the presence of a functional external electron donor and a catalyst system, carrying out a prepolymerization reaction on propylene to obtain a prepolymer A; the prepolymerization multiplying power is 1000 to 10000 times; s2, in the presence of a first molecular weight regulator, a first external electron donor and the prepolymer A, performing a first polymerization reaction on propylene to obtain a polymer B; s3, in the presence of a second molecular weight regulator, a second external electron donor and a polymer B, carrying out propylene second polymerization reaction to obtain polypropylene. According to the method, the prepolymerization reaction is combined with the polymerization reaction of two stages, the functional external electron donor is introduced in the prepolymerization process, and the specific first external electron donor and the specific second external electron donor are subsequently matched, so that the prepared polypropylene has good processability and heat resistance.

This application provides a glycourea polythiol curing agent composition, relating to the field of polymer materials technology. The composition comprises a mixture of a glycourea trithiol compound and a glycourea dithiol compound consisting of positional isomers. This composition, used as a curing agent for epoxy resin compositions, can form a highly uniform cross-linked network structure, enabling the cured epoxy resin composition to simultaneously possess a high glass transition temperature, high flexural modulus, and ultra-high fracture toughness, achieving an excellent balance between rigidity and toughness.

This invention belongs to the field of composite material technology. This invention provides a toughening agent material and its preparation method. The preparation method includes the following steps: S1, adding 10.8-11 parts by weight of polyacrylate-calcium carbonate toughening agent, 100 parts of polyvinyl chloride, 3.5-4 parts of stabilizer, 1.3-1.5 parts by weight of aluminum-modified nano-titanium dioxide, and 2-2.3 parts by weight of maleic anhydride-modified chlorinated polyethylene to a high-speed mixer and stirring to obtain a mixed base material; S2, plasticizing and molding the mixed base material obtained in S1 using a rubber mixing mill and a flat vulcanizing machine, then cooling and demolding to obtain the toughening agent material. This invention increases the amount of polyacrylate-calcium carbonate toughening agent to improve the flexural modulus of the prepared composite material while further improving its notched impact strength.

The invention relates to the technical field of polymer composite materials, in particular to a preparation method of high-impact-resistance PVC (polyvinyl chloride) composite resin, which comprises the following steps: step 1, adding nano calcium carbonate into a high-speed mixer, and spraying a treating agent twice to form a composite interface layer; step 2, mixing the product in the step 1 and PVC resin at a temperature lower than a glass-transition temperature in a segmented manner, so that the nano particles are embedded into pores of the PVC primary particles; step 3, adding an acrylic elastomer (ACR) emulsion into a product in the step 2, and controlling an ACR molecular chain migration path through a dynamic temperature field; and 4, dropwise adding a siloxane cross-linking agent containing an epoxy group into the system in the step 3 in an inert atmosphere, and monitoring and controlling the cross-linking reaction process in real time through the rheological property. By finely controlling the temperature, the mixing rate and the cross-linking reaction process in each step, the stability of the production process is improved, the production cost is reduced, and the reject ratio of finished products is reduced.

The invention relates to the technical field of double-wall corrugated pipes, in particular to a polyolefin alloy material double-wall corrugated pipe which comprises a double-wall corrugated pipe body, a first connector and a second connector are arranged at the two ends of the double-wall corrugated pipe body respectively, the first connector comprises an inner cylinder arranged at a port of the double-wall corrugated pipe body in a communicating mode, and an outer cylinder is arranged on the outer side of the inner cylinder in a sleeving mode. An inner ring is arranged in an annular space defined by the outer cylinder and the inner cylinder in a sliding mode, a straight cylinder arranged on the inner cylinder in a sliding and sleeving mode is arranged on the inner ring, a conical opening is formed in an end opening of the straight cylinder, the second connector is a cylinder body installed on the end face of the other side of the double-wall corrugated pipe body, and threads are arranged on the outer wall of the cylinder body; when the second connector is connected with the first connector, the second connector is inserted into the outer cylinder and meshed with the inner wall of the outer cylinder in a threaded mode, when the second connector is connected with the first connector, due to the fact that the second connector pushes the conical opening, the inner ring moves inwards to stretch the spring, and the elastic force of the spring is utilized to enable the conical opening to be in contact with the inner wall of the second connector all the time.

The application provides kaolin-barium sulfate nanocomposite powder and a preparation method and application thereof, and belongs to the technical field of inorganic nanocomposites. The kaolin-barium sulfate nanocomposite powder comprises single-layer kaolin nanosheets and barium sulfate nanoparticles deposited on the surface of the single-layer kaolin nanosheets; the thickness of the single-layer kaolin nanosheet is 1-10 nm, and the planar size is 100-500 nm; and the particle size of the barium sulfate nanoparticles is 10-50 nm. The kaolin nanosheet is used as a two-dimensional base to spatially isolate the barium sulfate nanoparticles and prevent migration and agglomeration of the barium sulfate nanoparticles; meanwhile, the surface-anchored barium sulfate nanoparticles serve as nanoscale spacing columns to physically block face-to-face restacking of the kaolin nanosheets, and the two are stable to each other, so that the dispersion problem of the two kinds of nanomaterials is fundamentally solved.

The invention relates to the technical field of high polymer material assistants, in particular to a preparation method and application of an anti-reflection polypropylene nucleation assistant.The anti-reflection polypropylene nucleation assistant.The anti-reflection polypropylene nucleation assistant.The anti-reflection polypropylene nucleation assistant.The anti-reflection polypropylene nucleation assistant.The anti-reflection polypropylene nucleation assistant.The anti-reflection polypropylene nucleation assistant.The anti-reflection polypropylene nucleation assistant.The anti-reflection polypropylene nucleation assistant.The preparation method has the advantages that the anti-reflection polypropylene nucleation assistant.The anti-reflection the surface lipophilicity is improved, the compatibility with a polypropylene matrix and a sorbitol nucleating agent is remarkably improved, and the problem of poor dispersity is solved; the sorbitol nucleating agent provided by the invention and an inorganic nanoparticle compounded system generate a synergistic effect, and compared with a single nucleating agent, the sorbitol nucleating agent provided by the invention can reduce fog of a polypropylene product, improve impact strength and improve flexural modulus; the composite nucleating agent provided by the invention can stably play a role at 180-200 DEG C, compared with a traditional nucleating agent, the processing temperature is reduced, the processing energy consumption is reduced, and the composite nucleating agent has a wide application prospect.

This invention relates to the field of propylene polymerization, and discloses a method for preparing polypropylene and its applications, as well as polypropylene and its applications. The method includes: S1, conducting a first polymerization reaction of propylene in the presence of a first molecular weight regulator, a first external electron donor, a functional external electron donor, and a catalyst system to obtain polymer A; S2, conducting a second polymerization reaction of propylene in the presence of a second molecular weight regulator, a second external electron donor, and polymer A to obtain polypropylene; the amount of the first molecular weight regulator is less than the amount of the second molecular weight regulator. This method introduces a functional external electron donor during the first polymerization process, while simultaneously controlling the first and second external electron donors to meet specific types and controlling the amount of molecular weight regulator at different polymerization stages, enabling the obtained polypropylene to possess both good processing properties and heat resistance.

The invention discloses an anti-warping metal spraying-free PC / ABS (Polycarbonate / Acrylonitrile Butadiene Styrene) alloy material and a preparation method thereof. According to the PC / ABS alloy material disclosed by the invention, the PC with high and low melt index is compounded in the components of the PC / ABS alloy material, so that the buckling deformation of the material is reduced, the excellent bending modulus and impact strength of the material are kept, and the rigidity, dimensional stability and processability of the material are remarkably improved; moreover, by adopting the specific talcum powder subjected to surface treatment by the silane coupling agent, the flexibilizer and the lubricant, the rigidity, the dimensional stability and the surface glossiness of the alloy material are further improved, and meanwhile, the spot defect of metal appearance is avoided. In addition, the vacuum degree in the alloy material machining process is optimized, small molecule volatile matter is removed, and the color difference after aging is reduced. The PC / ABS alloy material prepared by the invention not only has a good appearance effect of imitating metal spraying, but also has excellent rigidity, dimensional stability, surface glossiness, flame retardance and ageing resistance.