179results about How to "Good environmental stress cracking resistance" patented technology

The present invention relates to a preparation method of high-density polyethylene pipe material. It is characterized by that two reactors are series-connected, under the condition of polymerization the ethylene is contacted with alpha-olefin copolymer monomer containing at least 3-6 carbon atoms and catalyst. In first reactor the added quantity of ethylene is 40%-60% of total added quantity of ethylene of two reactors, and the volume ratio of hydrogen gas and ethylene is 3.0-15.0; in second reactor the added quantity of ethylene is 40%-60% of total added quantity of ethylene of two reactors, and the volume ratio of hydrogen gas and ethylene is 0.02-0.20, and the added quantity of copolymer monomer is 0.5%-2.5% of total added quantity of ethylene of two reactors.

The present invention discloses a large hollow container blow molding material, which comprises the following raw materials, by weight, 99.9-100.0 parts of an ethylene hexene copolymerization polyethylene base resin, 0.05-0.10 part of an antioxidant, 0.07-0.12 part of a co-antioxidant, and 0.03-0.05 part of a slip agent. The present invention further discloses a preparation method for the large hollow container blow molding material. The large hollow container blow molding material has characteristics of low fusion index, large molecule weight, high strength, and the like, and is suitable for blowing of large size containers, wherein the product has prominent rigidity and toughness balancing capacity, creep resistance, excellent ESCR and good chemical resistance.

The invention relates to a solar cell encapsulating EVA (ethylene vinyl acetate copolymer) adhesive film with high light transmittance. The solar cell encapsulating EVA adhesive film is characterized in that the thickness of the EVA adhesive film is 0.8 mm-1.1 mm, and the EVA adhesive film is prepared from raw materials in parts by weight as follows: 100 parts of EVA resin, 0.5-2.5 parts of a plasticizer, 0.1-0.3 parts of a photoelectric conversion rate enhancer, 1-4 parts of an anti-aging agent, 1.5-2.5 parts of a blocking agent, 1-2 parts of a dispersing agent, 1-3 parts of a coupling agent and 1-3 parts of a cross-linking agent. Firstly, the raw materials are added to a mixer proportionally and mixed into uniform components, the components are subjected to melt mixing by a banbury mixer and then subjected to extrusion and pelletizing, and the EVA adhesive film is obtained. According to the prepared EVA adhesive film, the light transmittance of the adhesive film is not influenced and the mechanical properties are greatly improved while properties and photoelectric conversion efficiency of the adhesive film are improved with addition of multiple additives.

The invention discloses an insulating heat conducting cable material. The insulating heat conducting cable material comprises the following raw materials in parts by weight: 60 to 70 parts of high-density polyethylene, 20 to 30 parts of modified polypropylene, 15 to 25 parts of heat conducting filler, 6 to 10 parts of polyolefin elastomers, 5 to 8 parts of glass fibres, 3 to 5 parts of a compatilizer, 3 to 8 parts of modified zinc borate, and 10 to 15 parts of ethylene-vinyl acetate copolymer. The insulating cable material is high in heat conductivity, high in insulating property, high in tensile strength, high in toughness, and convenient to process.

A polyolefin resin composition for pipes, comprising: 100% high-density polyethylene, melt flow rate 0.1-0.5g/10min, density 0.945-0.957g/cm3; 2) 10%-30% ultra-low density polyethylene, melt flow rate 0.1-20g/10min, density 0.860-0.900g/cm3; 3) 0.1%-0.30% peroxide modifier. The composition undergoes a micro-crosslinking reaction through a reactive extrusion process, which improves the environmental stress cracking resistance (>2000 hours) of the high-density polyethylene, and expands the application of the high-density polyethylene in pipes or other fields. The invention further discloses a preparation method of the resin composition.

The invention provides a graphene reinforced heat-resistant polyethylene composite pipe and a preparation method thereof and belongs to the technical field of pipeline materials. The invention mainly aims to solve the technical problem that a general polyethylene pipe is not high-temperature-resistant and is easy to damage. The graphene reinforced heat-resistant polyethylene composite pipe provided by the invention comprises the following components in parts by weight: 80-90 parts of hexane copolymerizing high-density heat-resistant polyethylene, 0.1-3 parts of graphene, 2-4 parts of fluorine-containing styrene, 2-4 parts of a coupling agent, 6-8 parts of a plasticizer, 1-3 parts of an antioxidant, 2-4 parts of a lubricating agent, 10-30 parts of a dissolution agent and 0.1-0.3 part of a surfactant. The invention further provides a preparation method of the graphene reinforced heat-resistant polyethylene composite pipe. The method comprises the following steps: dissolving, stirring, performing ultrasonic treatment, mixing, heating, performing single-screw extrusion and the like. The various raw materials are high in compatibility, the characteristics of the raw materials are effectively achieved, and the prepared pipe has high strength and heat resistance.

The invention relates to a high-flame retardation solar energy cell organosilicon pouring sealant and a preparation method thereof. The high-flame retardation solar energy cell organosilicon pouring sealant comprises the following raw materials in parts by weight: 40 parts of methyl phenyl vinyl silicone rubber, 20 parts of room-temperature sulfured phenylene silicone rubber, 20 parts of addition-type heat vulcanized nitrile silicone rubber, 20 parts of phosphate silicone oil, 20 parts of polyoxypropylene glycerol ether silicone oil, 10 parts of mercapto silicone oil, 5 parts of low-molecular hydroxy silicone oil, 5 parts of hydrogen-containing silicone oil with hydrogen containing amount accounting for 0.5% of mass content, 10 parts of an ethene-vinyl acetate copolymer, 10 parts of otcamethylcyclotetrasiloxane-modified acrylic resin, 7 parts of hydrogenated castor oil, 1-3 parts of an adhesion agent, 1-3 parts of a strengthening agent, 0.1-0.4 parts of a catalyst, 1-3 parts of a silicon nitrogen cross-linking agent, 0.5-2.5 parts of an inhibitor, and 1-2 parts of a flame-retardation filling material.

The invention discloses a long-chain branched high-density polyethylene material resisting environmental stress cracking and a preparation method thereof. According to the preparation method, long-chain branched modification is conducted on high-density polyethylene by selecting a melting reaction processing method to improve the environmental stress cracking resisting property of the material, branching generation is promoted by adding two-functionality-degree graft monomers, acrylic ester double bonds are adopted to stabilize the macromolecular free radicals and improve the branching efficiency, and meanwhile an efficient free radical regulating agent is added to regulate and control the activity of the macromolecular free radicals to inhibit crosslinking side reaction; the prepared long-chain branched high-density polyethylene has the low gel fraction, and long-branch-chain high-density polyethylene of which the branch chain length meets the stress cracking resisting requirement is obtained. The long-chain branched high-density polyethylene prepared through the preparation method has the excellent environmental stress cracking resisting property and the good comprehensive mechanical property.

The invention provides a polyethylene resin composition for a pipe. Based on 100wt% of high density polyethylene, the polyethylene resin composition comprises the following components in percentage by weight: 100% of high density polyethylene, 10%-30% of metallocene polyethylene, 0.05%-0.15% of complex crosslinking auxiliary, 0.1%-0.15% of lubricant and 0.1%-0.2% of antioxidant. The resin composition for the pipe has good environment stress cracking resistant property (large than 1000 hours). By using the polyethylene resin composition in the invention, the problem of poor environment stress cracking resistant property of the common high density polyethylene (HDPE) resin is solved.

The invention discloses a tracking-resistant polyethylene sheath material for a power wire and a preparation method thereof. The tracking-resistant polyethylene sheath material for the power wire is prepared from the following substances in parts by weight: 50-70 parts of high-density polyethylene, 30-40 parts of linear low-density polyethylene, 15-25 parts of ethylene-propylene-diene monomer, 3-6 parts of polytrifluoropropyl methylsiloxane, 10-15 parts of nano wollastonite, 20-25 parts of sediment white carbon black, 5-10 parts of nano-montmorillonite, 4-6 parts of ferrocene, 10-15 parts of magnesium hydroxide, 8-12 parts of methyl phenyl silicone oil, 2-3 parts of dibutyltin dilaurate, 3-5 parts of phosphoguanidine and 5-10 parts of borax. The sheath material is excellent in tracking resistance, so that the electric erosion phenomenon on the surface of the power wire in extra-high voltage can be solved; meanwhile, the sheath material is good in physical and mechanical properties, electrical insulation property, environmental stress crack resistance, ageing resistance and heat resistance, durable in use, long-term in operation in outdoor severe environment without failure, good in flame retardant effect, low in smoke during combusting without harmful gas release, free of environmental pollution, safe and environment-friendly.

The invention discloses an anti-cracking flame-retardant cable sheath material. The material is prepared from, by weight, 40-55 parts of linear low-density polyethylene, 10-15 parts of high-density polyethylene, 25-40 parts of methyl vinyl silicone rubber, 20-30 parts of ethylene-octylene copolymer, 5-10 parts of hydrogen-containing silicone oil, 4-8 parts of talcum powder, 0.5-1.5 parts of aluminum nitride nano-particles, 10-20 parts of aluminum hydroxide, 6-10 parts of zinc borate, 1-3 parts of an antioxidant, 0.1-0.3 part of chloroplatinic acid and 1-5 parts of a cross-linking agent. The anti-cracking flame-retardant cable sheath material is excellent in mechanical property, flame retardancy and cracking resistance.

The invention discloses a two-layer composite pipe which comprises an inner layer and an outer layer. A binding layer is arranged between the inner layer and the outer layer. The inner layer is prepared from, by mass, 43%-45% of ultra-high molecular weight polypropylene and 30%-32% of low-density polyethylene, the outer layer is prepared from, by mass, 2%-15% of modified nano calcium carbonate, 62%-70% of HDPE, 20%-28% of nano calcium carbonate and 0.5%-6% of lubricating agent, and the binding layer is formed by a coated binding agent prepared from raw rubber, butadiene styrene rubber, silicasolution, refractory mortar, pitch, rosin, silicon dioxide, zinc oxide, water and diethylenetriamine. The two-layer composite pipe has the beneficial effects that the good ultraviolet light resistanceand nuclear radiation resistance, flexibility and excellent wear resistance and durability are achieved, the binding agent is good in compatibility, capable of being dried by itself at normal temperature, nontoxic, odorless and high in adhesive force, the modified nano calcium carbonate and the nano calcium carbonate are added to enable the composite material to have the better mechanical property, and the pipe has the better toughness, better hardness and higher environment stress cracking resistance compared with an HDPE two-wall corrugated pipe.

The invention discloses a modified weather-resistant high-density polyethylene sheathing compound for bridge cables. A method for preparing the modified weather-resistant high-density polyethylene sheathing compound includes mixing ultrahigh-molecular-weight polyethylene, high-density polyethylene, linear low-density polyethylene, low-density polyethylene, antioxidants and polyethylene wax with one another in high-speed mixers at normal temperatures to obtain mixtures, discharging the mixtures into parallel double-screw granulation units, melting and extruding the mixtures, granulating the mixtures under underwater conditions to obtain particles, dehydrating the particles, and then drying the particles to obtain modified high-density polyethylene particles; mixing the obtained modified high-density polyethylene particles, high-density polyethylene, carbon black parent materials, antioxidants and silicone parent materials with one another in the high-speed mixers at normal temperatures to obtain mixtures, discharging the mixtures into the parallel double-screw granulation units, melting and extruding the mixtures, granulating the mixtures under underwater conditions to obtain particles, dehydrating the particles, and drying the particles to obtain the modified weather-resistant high-density polyethylene black sheathing compound for the bridge cables. The modified weather-resistant high-density polyethylene sheathing compound and the method have the advantages that the sheathing compound is excellent in physical and mechanical properties, in particular, the ultraviolet resistance property and the environmental stress cracking resistance property, and various indexes of manufactured products conform to requirements of standards CJ/T297-2008 of housing construction departments.

The invention provides a hot melt adhesive for an acrylic hot-fix rhinestone. The hot melt adhesive comprises the following components by weight: 10 to 15 parts of EVA resin with the VA content of 28% and the MI of 150 g/10min, 0 to 35 parts of EVA resin with the VA content of 28% and the MI of 6 g/10min, 4 to 12 parts of thermoplastic polyurethane with Shore D hardness of 70, 30 to 40 parts of styrene modified C5 petroleum resin, 10 to 20 parts of polyethylene wax, 2 to 6 parts of EBA3427AC and 1 to 2 parts of an antioxidant 1010. The hot melt adhesive for the acrylic hot-fix rhinestone provided by the invention has a hot-press temperature of 115 to 120 DEG C, is not prone to scalding the acrylic hot-fix rhinestone and fabrics, and has peeling strength of no less than 4.0kN/m , thereby having high bonding strength at the same time; meanwhile, the hot melt adhesive has the advantage of good adhesive force with a variety of fabrics and acrylic hot-fix rhinestones, and is an ideal hot melt adhesive for the acrylic hot-fix rhinestone.

The invention discloses a novel composite film. The composite film consists of an upper outer layer, a lower outer layer and a middle core layer, wherein the core layer and the outer layers are compounded into a whole by adhesive. The outer layer can be in a single layer structure, a double-layer structure or a multi-layer structure which consists of more than two layers of single film. The core layer can be in a single layer structure, a double-layer structure or a multi-layer structure which consists of more than two layers of single film. The core layer is made of polyethylene glycol terephthalate PET has the density of 1.395g/cm<3>-1.405g/cm<3> and the thickness of 10 micrometers to 50 micrometers. The outer layer is made of one of low-density polythene (LDPE), high-density polythene (HDPE) and casting polypropylene (CPP), and also can be made by mixing two or more than two of low-density polythene (LDPE), high-density polythene (HDPE), casting polypropylene (CPP) and metallocene polythene (mPE). The adhesive is one of single-component polyurethane adhesive, bicomponent polyurethane adhesive, alcohol-soluble polyurethane adhesive and water-soluble polyurethane adhesive. The overall thickness of the composite film is 25 micrometers to 150 micrometers.

The invention discloses a non-asphalt-based reactive pre-paved polymer self-adhesive film waterproof coiled material, which includes a waterproof coiled material body, and the waterproof coiled material body includes a resin polymer sheet, a polymer waterproof base layer and a self-adhesive membrane. Adhesive outer layer, the outer surface of the polymer waterproof base layer is fixedly connected with the resinous polymer sheet, and the outer surface of the resinous polymer sheet is fixedly connected with the self-adhesive outer layer. The non-asphalt-based reactive pre-paved polymer self-adhesive film waterproof membrane has super bonding performance, the peel strength is 2-3 times that of ordinary self-adhesive membranes, high tear resistance, waterproof and impermeable It has strong performance and hydrolysis resistance, and has a skin-like waterproof effect, which is conducive to popularization and use. It has excellent toughness, strong elasticity, stress crack resistance, softness, and high toughness. Poor, low tear strength, poor waterproof and impermeable performance and hydrolysis resistance, which is not conducive to popularization and use.

The invention discloses a polymer waterproof roll and a production process thereof. The waterproof roll comprises an outer waterproof layer, a base material layer, an isolating membrane layer and an inner polymer polyester layer which are in press fit from outside to inside, wherein the outer waterproof layer and the base material layer are composited by a pressure-sensitive adhesive, and the isolating membrane layer and the inner polymer polyester layer are composited by the pressure-sensitive adhesive. The production process comprises five steps as follows: material blending and internal mixing; extrusion; three-roller calendering; cooling forming; cutting and rolling. The waterproof roll has good waterproof and dampproof performance, weather resistance, aging resistance, wear resistanceand tensile property and can meet the demand of most building fields for waterproof and dampproof performance.

A novel high-strength composite material and a preparation method thereof belong to a polyvinyl structural composite material and a preparation method thereof. The novel high-strength composite material is prepared by the following materials in parts by weight: 100 parts of linear LDPE ( low density polyethylene), 2 to 10 parts of HDPE (high density polyethylene), 1 to 5 parts of PA (polyamide) (nylon), 0.1 to 2 parts of a strong oxidant, 1 to 5 parts of PE starch, 1 to 8 parts of carbon black, and 1 to 5 parts of a fire retarding agent. The novel high-strength composite material provided by the invention is excellent in comprehensive service performance, can improve material rigidity, toughness and environmental stress crack resistance. The novel high-strength composite material is excellent in mechanical processing capability, runnability, thermal stability, and impact resistance, and also is relatively good in wearing resistance, environmental stress crack resistance, heat resistance, rigidity, antistatic performance, degradability, flame retardancy and the like.