34results about How to "Improves stress cracking resistance" patented technology

The invention relates to a composite material for packaging and a preparation method thereof. The composite material comprises 60-90 wt% of inorganic powder filler, 10-40 wt% of organic component for bonding and consolidating, wherein the filler refers to inorganic powders with 2-5 grain size values which are mixed uniformly according to selected grain size-value combination and grain size-weight combination, a coupling layer formed in the presence of a long-chain alkyl silane coupling agent exists between the inorganic powder surface and the organic component. According to the invention, through the proper matching of inorganic fillers with different grain sizes, the dispersion viscosity of the inorganic fillers in an organic system can be reduced effectively so as to improve the flowability of the inorganic fillers, so that more inorganic fillers can be filled under the same viscosity or same forming conditions, thereby further reducing packaging cost, improving packaging efficiency, improving the thermal conductivity of a package and reducing the thermal expansion coefficient of the package; through the adoption of a novel coupling agent, the surface modification effect of powder can be improved, compatibility between the inorganic filler and the organic component and bonding force between interfaces can be enhanced remarkably, and the overall water absorption of the composite material and the package can be reduced.

The invention discloses a carbon black master batch for a polyethylene geomembrane. The carbon black master batch is composed of, by weight, 23%-40% of high-density polyethylene resin, 4%-12% of linear low-density polyethylene resin, 48%-55% of carbon black, 7%-10% of antioxygen and 0.05%-2% of fluorocarbon polymer. The master batch and a material special for the polyethylene geomembrane are used for conducting melt blending, and thus a geomembrane product capable of meeting GB-T 17643-2011, GM13, CJ 234 standard requirements can be obtained through squeezing or blowing. The geomembrane product prepared through the method has excellent performance on the aspects of tensile yield strength, anti-UV intensity and the like.

The invention relates to the technical field of hot melt adhesive material processing and discloses a modified polyethylene-vinyl acetate hot melt adhesive applied to plastic bonding. The modified polyethylene-vinyl acetate hot melt adhesive is prepared from the following components in parts by weight: 50-60 parts of modified polyethylene-vinyl acetate resin, 40-50 parts of tackifier, 5-8 parts of filler, 3-5 parts of paraffin, 1-2 parts of antioxidant and 0.2-0.3 part of plasticizer. After resin modification, the toughness, impact resistance, softness, stress cracking resistance, viscosity, thermal airtightness and repeated bending property in a low-temperature state are enhanced; the peel strength of cementing is improved, and the rubber elasticity is boosted; moreover, the strength, hardness, melting point and thermal deformation temperature are raised along; the heat resistance and the coating uniformity are high; the modified hot melt adhesive has the characteristics of perfect flexibility and bonding strength and the like and also has the advantages of low melt viscosity and high heat resistance.

The invention relates to an anti-tearing and anti-aging modified master batch. A formula of the anti-tearing and anti-aging modified master batch comprises the following ingredients in parts by weight: 15 to 25 parts of carrier resin, 70 to 80 parts of filling materials, 0.5 to 1 part of coupling agents, 2 to 4 parts of dispersing agents, 0.2 to 1 part of light stabilizers, 0.2 to 0.5 part of antioxidants and 0.2 to 1 part of graphene. The nanometer calcium carbonate or talc powder is used as filling materials; meanwhile, polyethylene, graphene, the light stabilizing agents and the antioxidants are added, so that the product has high anti-tearing performance, excellent UV-resistance effect and long service life; the heat degradation in the processing process can be effectively inhibited; the heat oxidization aging and light aging in the use process can be relieved; the anti-tearing and anti-aging modified master batch is applicable to plastic products such as polypropylene flexible freight bags, weaving bags and films with the anti-aging requirements.

The invention relates to a cross-linkable ethylene-tetrafluoroethylene copolymer and a synthetic method thereof. A polymer is prepared from tetrafluoroethylene, ethylene, a monomer A and a monomer B through copolymerization, wherein the monomer A is a compound containing one double bond, and the monomer B is a compound containing two double bonds; and by virtue of proper crosslinking, the ethylene-tetrafluoroethylene copolymer can be endowed with relatively high radiation resistance, toughness, abradability, tensile strength and tear strength. The invention further provides a preparation method of the cross-linkable ethylene-tetrafluoroethylene copolymer and a cross-linkable copolymer composition. By controlling a polymerization process, too many low polymers can be reduced, and excellent performance of the polymer can be maintained.

The invention discloses a TRB (thermoplastic rubber) high-physical-property composite injection-molding rubber material which is prepared from the following raw materials in parts by weight: 50-60 parts of SBS (styrene-butadiene-styrene), 10-20 parts of SEBS (styrene-ethylene-butadiene-styrene), 20-30 parts of nitrile-butadiene rubber, 15-20 parts of polystyrene, 15-20 parts of softening oil, 4-8 parts of silica white, 5-7 parts of nano calcium carbonate, 4-5 parts of low-temperature foaming agent, 1.5-2 parts of high-polymer wear-resistant oil and 5-10 parts of grafting substance.

The invention discloses a preparation method of a TRB composite injection molded rubber material with high physical property. The preparation method comprises the following steps: tabletting nitrile rubber into slices with the thickness of 0.5-0.8mm in a plastication mode firstly, cutting each slice until the weight of each slice is 0.5-1kg, then throwing in a stirring barrel, adding emulsified oil, soaking for 30min, then adding SBS and SEBS, stirring for 30-40min, taking out a mixture from the stirring barrel, standing for 5-7h, and naturally cooling; throwing the cooled material in an internal mixer, adding polystyrene, softening oil, white carbon black, nanometer calcium carbonate and polymer wear resistant oil, carrying out internal mixing for 3-4min, then adding a filler, a rubber additive and a lubricant, and carrying out internal mixing for 6-7min; after internal mixing, discharging the material by virtue of a double-shaft extruder, then cooling and pelleting the material to obtain particles, injecting the particles in a mold by virtue of an ejection pipe, and carrying out injection for 4-8min at temperature of 150-160 DEG C and pressure of 10-15mpa.

The invention discloses a packaging film for a multilayer co-extruding urine bag. The packaging film comprises a heat sealing layer, a core layer and a weather-resisting layer, which are arranged in turn, wherein the heat sealing layer, the core layer and the weather-resisting layer are modified ethylene-vinyl acetate copolymer layers. The invention also discloses a method for producing the packaging film for the multilayer co-extruding urine bag. The method comprises the following steps: preparing materials, extruding a multilayer co-extruding film head, blowing up, cooling and shaping, rotating and dragging, measuring thickness on line, coiling and cutting. The packaging film for the multilayer co-extruding urine bag provided by the invention is the packaging film which is excellent in comprehensive property, especially separating property, is suitable for various devices and interfaces, is excellent in properties for sealing and protecting urine, and is used as a urine packaging material applied to the medical field.

The invention discloses a transparent and breathable fish tank. The fish tank is assembled by splicing transparent and breathable macromolecular panels. The top of the fish tank is opened, other parts, at least the ornamental side, of the tank body is made from the transparent and breathable macromolecular panels, the transparent and breathable macromolecular panels are provided with continuous cut-through pore ways in the thickness direction, and the continuous cut-through pore ways extend linearly and have the diameters of 0.6 micrometers or below. According to the comparison of the transparent and breathable fish tank and a common fish tank, an oxygenation pump is reduced, the production and operation cost of the fish tank is lowered, and the wholeness and the ornamental value of the fish tank are improved.

The invention provides a high dyeability EVA color master batch special for shoes. The high dyeability EVA color master batch comprises, by weight, 30-70 parts of an EVA carrier resin, 5-20 parts of apigment, 5-10 parts of sucrose fatty acid ester, 3-7 parts of EVA wax, 3-7 parts of polyethylene wax, 4-8 parts of octadecanamide, 2-4 parts of white oil, 3-7 parts of oleamide, 3-7 parts of a coupling agent, 7-12 parts of a maleic anhydride graft compatilizer, 5-9 parts of an antioxidant, 2-6 parts of a light stabilizer and 10-40 parts of a filler. The high dyeability EVA color master batch special for shoes is prepared from the above raw materials through processes, has the advantages of no flow pattern, no color point, small color difference, good light aging resistance, strong resistanceto thermo-oxidative aging and good dispersibility and solves the existing EVA master batch problems of uneven color and large color difference in coloring.

The invention discloses a hexadecafluoro-1-octene modified polyperfluoro ethylene-propylene resin and a solution polymerization preparation method thereof. According to the solution polymerization preparation method, tetrafluoroethylene, hexafluoropropylene and hexadecafluoro-1-octene serve as copolymerizable monomers, wherein a molar fraction of the tetrafluoroethylene to hexafluoropropylene to hexadecafluoro-1-octene is (80-95):(4.9-15):(0.1-5). The preparation process comprises the following steps: adding a fluorine-containing solvent and copolymerizable monomers into a reactor at a certain temperature, raising the temperature to 20-60 DEG C, adding a perfluoro initiator to initiate a polymerization reaction under the pressure of 1.1-1.5MPa, supplementing the copolymerizable monomers in the reaction process, and finally preparing the modified polyperfluoro ethylene-propylene. The modified monomers are taken as polyperfluoro monomers, so that the prepared modified polyperfluoro ethylene-propylene resin is excellent in heat resistance, causes no aggregate dyeing phenomenon, can serve as a high-speed extrusion grade product and can be stably coated on a cable surface at a high speed of 300-500m/min.

The invention relates to a fireproof polyvinyl chloride material which comprises 110 parts of polystyrene, 1 part of silica white, 1 part of phthalate, 2 parts of nano activated calcium carbonate, 3 parts of polystyrene, 20 parts of ultra-low density polyethylene, 4 parts of zinc borate, 3 parts of polypropylene cellulose, 5 parts of triethyl phosphate, 4 parts of bromine flame retardant, 12 parts of antioxidant and 3 parts of dibutyl phthalate. The polyvinyl chloride composite material has the advantages of favorable flowability, favorable flame retardancy, higher viscosity, better processing flowing property, favorable heat resistance, favorable weather resistance, favorable ultraviolet resistance, high average application temperature, mature production and extrusion technique, extremely high stress cracking resistance, low production cost, tube cost saving and higher load-bearing capacity, and is an environment-friendly novel polyvinyl chloride composite material.

The invention belongs to the technical field of optical fiber sheath materials, and particularly relates to a special material for a 5G optical fiber sheath and a preparation method of the special material. The special material is prepared from PBT resin slices, an alpha-methylstyrene-acrylonitrile copolymer, aluminum silicate fibers, a titanate coupling agent, polyether, a light stabilizer, an ultraviolet light absorber and an antioxidant. According to the special material of the invention, the alpha-methylstyrene-acrylonitrile copolymer and the polyether are introduced into the PBT resin slices at the same time, so that the alpha-methyl styrene-acrylonitrile copolymer still can significantly increase the softening point of the PBT resin when being used at a low dosage, the heat resistance of the PBT resin is improved, and the problem of cost increase caused by a condition that that the heat resistance of the PBT resin is improved by adopting high-content alpha-methyl styrene-acrylonitrile copolymer in the prior art is solved; the polyether is doped into the PBT resin slices, so that the melt rheological property of the PBT resin slices in a melting processing process is improved,and the good processability of the PBT resin slices is ensured.

The invention belongs to the field of organic high molecular compounds, and relates to a polypropylene composite material as well as a preparation method and use thereof. The polypropylene composite material is prepared from the following components in parts by weight: 80-100 parts of polypropylene, 10-20 parts of thermoplastic elastomers, 8-12 parts of low density polyethylene, 8-12 parts of inorganic filler, 5-8 parts of crystal whiskers, 0.3-0.6 part of an antioxidant, 0.3-0.6 part of oxidized polyethylene wax, 2-4 parts of polypropylene-grafted maleic anhydride and 0.1-0.3 part of a coupling agent. The polypropylene composite material disclosed by the invention can be used for preparing steering wheels. The product produced by using the composite material has the advantages of uniform surface gloss, uniform color, comfortable feel, good stress cracking resistance, good comprehensive mechanical property and the like.

The invention discloses a hexadecafluoro-1-octene modified polyperfluoro ethylene-propylene resin and an emulsion polymerization preparation method thereof. The method comprises the following steps: adding deionized water accounting for 50-70% of total volume into a reactor with a stirrer; replacing until oxygen content is qualified, adding an emulsifier or other aids, tetrafluoroethylene, hexafluoropropylene and hexadecafluoro-1-octene and other pre-added copolymerizable monomers; starting to stir and raising the temperature to 60-120 DEG C, controlling the reaction pressure to be 2-5MPa, adding an initiator, supplementing a certain amount of copolymerizable monomers so as to obtain polymer emulsion; and condensing, washing and drying the emulsion, thereby obtaining the modified polyperfluoro ethylene-propylene resin. According to the method disclosed by the invention, the hexadecafluoro-1-octene modified monomer serves as a perfluoro monomer, the prepared modified polyperfluoro ethylene-propylene resin is excellent in heat resistance, does not have an aggregate dyeing phenomenon, can serve as a high-speed extrusion grade product, and can be stably coated onto the cable surface at a high speed of 300-500m/min.

The invention relates to the technical field of chemical materials, and discloses a filler capable of improving heat-resistant strength of an EVA hot melt adhesive. Inorganic materials such as ilicondioxide are adopted to be compounded with aluminum silicate fibers, so as to form a solid network structure; polyvinyl alcohol is adopted to improve the compatibility of a composite modified materialwith the EVA resin; the prepared filler can be tightly connected with EVA resin molecule, so that the crystallinity is changed, the melt index is improved, and the cure shrinkage is reduced; the meltadhesive in a molten state has better fluidity, the wetting property thereof is not influenced, the stress cracking property, tensile strength and tenacity of the melt adhesive are improved, and the breaking elongation, the yield strength and the rigidity are about 3-4 times of common levels; the filler dosage is 20-25% of a common filler, so that the cost is saved. By virtue of utilizing microstructure changes to determine macroscopical performances, the filler is capable of obviously improving the heat-resistant strength of the EVA hot melt adhesive, and realizing practical significance of high-quality low-cost production of hot melt adhesives, thereby being a technical scheme worthy of popularization and use.

The invention discloses high-viscosity special mortar for prefabricated buildings and a preparation method of the high-viscosity special mortar, wherein the high-viscosity special mortar comprises a biogel modified aqueous acrylic acid solution, a high-adhesion silane modified polyether sealant, asphalt and glass fibers. The invention also provides the preparation method of the high-viscosity special mortar. The preparation method of the high-viscosity special mortar comprises a high-viscosity special mortar main material preparation method, a high-viscosity special mortar auxiliary material preparation method and a special mortar blending process. According to the method, large-batch rapid production of the fabricated building components can be met. The mortar has high viscosity and good shaping property after molding, is convenient for compression molding and rapid demolding, and greatly improves the molding efficiency; especially, when components are assembled and prevented from deforming, cracking and being repaired after being damaged, construction is convenient, connectivity is good, repairing efficiency is high, the service life is long, and defects are few.