30results about How to "Good resistance to environmental stress cracking" patented technology

Techniques for creating recycled plastic materials from waste plastic materials are described. A recycled plastic material contains at least a primary polymer, a secondary polymer, and residual additives. Predetermined properties of the recycled plastic material can be controlled by selecting the types of waste plastic materials used in the recycling feed, determining the types and amounts of recycled plastic material recovered from a separation process and blending the recycled plastic material with other materials.

The invention provides a liquid package composite membrane and a preparation method thereof and belongs to the technical field of plastic package. The composite membrane comprises a surface layer, an obstruction layer, a reinforced layer and a heat seal layer, wherein the surface layer is a polyethylene terephthalate film layer; the obstruction layer is an aluminum foil layer; the reinforced layer is a polyethylene terephthalate film layer; and the heat seal layer consists of the following materials: 40-60wt% of eight-carbon linear low-density polyethylene, 35-50wt% of polyvinyl acetate and 5-10wt% of low-density polyethylene. The liquid package composite membrane provided by the invention has excellent break-resistant and pressure-resistant performances; break-resistant performance test shows that the liquid package composite membrane does not break while falling to a cement floor from a height of 10 meters once; and pressure-resistant performance test shows that the liquid package composite membrane has no leakage within 24 hours when the static pressure is 20MPa.

The invention discloses a cold-resistant plastic bucket and a preparation method thereof, and belongs to the technical field of a plastic packaging container. The cold-resistant plastic bucket is characterized in that the cold-resistant plastic bucket is prepared from the components in parts by weight: 60 to 80 parts of high-density polyethylene, 15 to 25 parts of linear low-density polyethylene,10 to 20 parts of maleic anhydride grafted high-density polyethylene, 5 to 7 parts of high-polymerization-degree polyvinyl chloride, 6 to 8 parts of ethylene-vinyl acetate copolymer, 0.5 to 1.0 part of ultraviolet absorption agent, 1 to 1.5 parts of antioxidant, 2 to 3 parts of plasticizer and 5 to 7 parts of silica power; the high-density polyethylene has a density of 0.936 g/cm<3> and a melt index of 1.4 g/10 min; the linear low-density polyethylene has a density of 0.920 g/cm<3> and a melt index of 1.0 g/10 min. The invention reaches the technical effect of enabling the polyethylene plasticbucket to also have excellent printing performance when having cold resistance.

The invention relates to a high-performance barrier environmental-friendly package material of an inner bag of a flexible freight bag and a preparation method of the package material, which belong to the technical field of flexible package materials. The environmental-friendly package material structurally sequentially comprises a first polyethylene layer, a first adhesive layer, an ethylene-vinyl alcohol (EVOH) layer, a second adhesive layer and a second polyethylene layer from top to bottom; a composite thin film is prepared via a five-layer co-extrusion casting process. The package material of the inner bag of the flexible freight bag has good barrier performance, an environmental-friendly effect and an excellent appearance effect, saves resources and energy, enables packaged goods to not deteriorate easily, and is excellent in thin film transparency, thickness tolerance and heat sealing performance; the environmental-friendly package material prepared via the multiple-layer co-extrusion casting process has the advantages of being easy to recover, generating no harmful gas after burning, and the like, thereby having very high practical value and good market prospects.

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 relates to a flexible pipe, in particular to a flexible pipe for water purifying equipment. The flexible pipe comprises an inner layer pipe and an outer layer pipe. The inner layer pipe is placed inside the outer layer pipe in a sleeved mode. A braiding layer is formed between the inner layer pipe and the outer layer pipe. The braiding layer forms a net shape through a plurality of strands of wire-shaped bodies in a crossing mode and is wound on the outer wall of the inner layer pipe. Wire filaments are made of reinforcing fibers. The wire-shaped bodies are formed by a plurality of wire filament bundles in a combined mode, and each bundle comprises 200-250 wire filaments. The flexible pipe is good in tenacity and high in impact-resisting strength, pipeline breaking cannot be caused when a heavy object runs over a pipeline directly, PE intensity is high, environment-stress-cracking-resisting performance is good, and creep resistance is good.

The invention discloses an ultraviolet irradiation cross-linked cable material. The ultraviolet irradiation cross-linked cable material comprises, by weight, 20-50 parts of high-density polyethylene,80-100 parts of low-density polyethylene, 30-50 parts of flame retardants, 6-8 parts of melamine cyanurate, 2-4 parts of epoxidized soybean oil, 0.5-5 parts of ultraviolet absorbers, 0.2-0.5 part of coupling agents, 1-5 parts of antioxidants and 0.2-0.4 part of stearic acid. The ultraviolet irradiation cross-linked cable material has the advantages that the thermal properties and the temperature resistance of the ultraviolet irradiation cross-linked cable material can be improved, and accordingly the problems of low work environment temperatures and heat intolerance of existing ultraviolet irradiation cross-linked polyethylene insulation materials can be effectively solved by the aid of the ultraviolet irradiation cross-linked cable material.

The invention discloses a high-flexible environment-friendly shrink film. The shrink film is prepared from, by weight, 5-15 parts of polypropylene, 15-20 parts of polyethylene, 30-40 parts of linear low-density polyethylene, 1-5 parts of high-density polyethylene, 60-80 parts of thermoplastic starch, 5-10 parts of dibutyl phthalate, 1-5 parts of polyethylene wax, 0.5-1 part of antioxidant 168 and1-2 parts of hydrogenated castor oil. The high-flexible environment-friendly shrink film has the advantages of high transparency, high stretching intensity, high tear resistance, good flexibleness andenvironmental friendliness.

The invention discloses a compound sound insulation material and a preparation method thereof. The compound sound insulation material contains the following materials by weight percent: 40% of vinyl chloride acetate resin, 10-20% of low-density polyethylene, 20-30% of methyl vinyl silicone rubber, 5-10% of a high molecular compatilizer, 2-3% of a diluent, 1-5% of superfine fiber, and 1-2% of an antioxidant. The preparation method comprises the following steps: S1, weighing and preparing materials: weighing the materials according to weight percentage and marking for storage; S2, feeding and blending; S3, plastifying; and S4, performing extrusion molding. According to the invention, due to the setting of components including vinyl chloride acetate resin, low-density polyethylene, methyl vinyl silicone rubber, high molecular compatilizer, diluent, superfine fiber and antioxidant, so that the sound insulation effect of the compound sound insulation material is improved; and due to the setting of preparation procedures of weighing and preparing materials, feeding and blending, plastifying and performing extrusion molding. Therefore, the quality of the sound insulation material is promoted, and further the market competitiveness of the product is promoted.

The invention discloses an automobile exterior trimming special material prepared from a TPO skin reclaimed material and a preparation method thereof. Raw materials comprise: a TPO skin reclaimed material, copolymerized PP, a molecular weight regulator, a flexibilizer, a compatilizer, a weather-resistant agent, a filler, an antioxidant and a colorant. The preparation method comprises the followingsteps: mixing and stirring the TPO skin reclaimed material and the molecular weight regulator, adding the copolymerized PP, the flexibilizer, the weather-resistant agent, the compatilizer, the antioxidant, the filler and the colorant, mixing and stirring the components; and feeding the mixture into a double-screw extruder for perfomring extrusion, cooling, drying and granulation. The TPO skin regenerated material is creatively applied to production of special materials for automobile exterior decorations such as automobile fenders and wheel covers, so that the product can completely meet theworking condition performance requirements of the automobile exterior decorations such as the automobile fenders and the wheel covers, so that high-impact-resistance PP or PE materials are replaced, the problems of resource waste, environmental pollution and the like can be relieved, the production cost can be effectively reduced, and economic benefit is increased.

The invention discloses a stress-resistant plastic part machining technology. The stress-resistant plastic part machining technology comprises the following steps of: a, mixing: mixing ethylene-hexene copolymerized polyethylene resin, an antioxidant, an auxiliary antioxidant and a release agent; b, compounding: compounding the mixture in the step a; c, cooling: cooling the mixture extruded in the step b; and d, pelletizing: pelletizing the mixture in the step c. A cooling tank in the step c comprises a main body, a material opening, a cooling cavity, a transfer roller, a transfer spring, a flow guide cylinder, a flow guide device, a drying cavity, a fan, a drying device, a rotating wheel, a first collecting belt, a collecting spring, a second collecting belt, a second motor, a driving cylinder, a scraper blade, an opening and a water removal mechanism. According to the stress-resistant plastic part machining technology, the stress resistance of the plastic can be improved, so that the comprehensive mechanical property of the plastic is higher. The cooled mixture is dried, so that the washed impurities in cooling water can be removed, and the quality of the plastic is improved. Impurities in the drying cavity are automatically cleaned during drying, so that the cooling and drying efficiency is improved.

A silane cross-linked high-strength polymer film orientated by stretching has at least one layer of silane cross-linked polymer, and is prepared through stretching unidirectionally or bidirectionallyfor orientation, hydrolysis in wet and hot condition, and condensation and cross-linking reaction. It has high concave-convex reinforcing ribs for higher tension strength. Its advantages are high resistance to ageing and cracking, high strength and long service life.

The invention discloses a fan-shaped and round fire-resisting cable provided with a Y-shaped nylon framework. The cable comprises a cable core which comprises the Y-shaped nylon framework, wherein a temperature measurement cable core body is arranged at the center of the Y-shaped nylon framework, a control cable core body is arranged in each of two interspaces of the Y-shaped nylon framework, and a ground cable core body is arranged in another interspace of the Y-shaped nylon framework. The ground cable core body comprises a fan-shaped conductor which is wrapped in a crosslinked polyethylene insulation layer. Each control cable core body comprises two round conductors and silicon rubber insulation layers arranged outside the round conductors in a wrapping mode, and the two round conductors are twisted together in a pairing mode and then wrapped in a fire-resisting mica layer. The cable core is sequentially wrapped in a glass fiber fire-resisting layer, a steel-plastic strip longitudinal wrapping armor layer and a sheathe layer. According to the cable, a temperature measuring conductor and a control cable are combined through the Y-shaped nylon framework, temperature change occurring when the cable is used can be monitored, and then the warning function is achieved, fire disasters can be stopped or avoided in advance, and the stability of the cable is guaranteed.

The invention transparent rubber modified styrene resin, which comprises (i-1) phenylethene monomer 20-70 weight portions, (i-2) methacrylate ester 30-80 weight portions, (i-3) copolymarization monomer 0-40 weight portions, and polyfunctional maleimide monomer 0.0005-1.0 weight portion as continuous phase, as well as rubber particles formed by rubber-like polymer as disperse phase, the content rubber in the transparent rubber modified styrene resin is 1-40 wt%.