123results about How to "Improve low temperature impact strength" patented technology

The invention belongs to the technical field of blending processing of copolymers and discloses a blended material of an ethylene-vinyl alcohol copolymer and high-density polyethylene. The blended material comprises the following components in percentage by weight: 50.0 to 80.1 percent of ethylene-vinyl alcohol copolymers, 10.0 to 30.0 percent of high-density polyethylene, 5.0 to 15.0 percent of flexibilizer, 4.8 to 15 percent of compatilizer, and 0.1 to 1.0 percent of antioxidant. The invention also discloses a method for preparing the blended material. The blended material has high gas resisting property of EVOH as well as high moisture resisting property of HDPE; the product cost is effectively lowered; the EVOH/HDPE blended material is good in toughness, the normal-temperature and the low-temperature impact strengths of the EVOH/HDPE blended material are obviously higher than those of the EVOH, and the application range of EVOH is widened.

A process for producing a thermoplastic elastomer composition comprising the step of crosslinking dynamically at least the following components (A) to (C) in the presence of a crosslinking agent: (A) 10 to 50% by weight of an oil-extended ethylene-α-olefin-non-conjugated diene copolymer rubber having a density of 850 to 900 kg/m³, and a Mooney viscosity (ML₁₊₄ 100° C.) of 30 to 150, (B) 20 to 60% by weight of an ethylene-α-olefin copolymer having a density of 850 to 910 kg/m³, and a melt flow rate of 0.05 to 80 g/10 minutes measured at 230° C. under a load of 21.18 N, and (C) 20 to 60% by weight of a propylene resin, the total amount of the components (A) to (C) being 100% by weight; and an air-bag cover comprising a thermoplastic elastomer composition produced according to said process.

The invention belongs to the technical field of plastics modification and particularly relates to a modified polypropylene material for a high-performance thin-wall automobile door panel and a preparation method thereof. The material is prepared from, by mass, 5%-10% of homopolymerized PP, 20%-30% of first copolymerized PP, 15%-25% of second copolymerized PP, 12%-18% of toughening agent, 1%-2% of compatilizer, 0.4%-0.6% of antioxidant, 0.2-0.4% of weather resistance agent, 3%-6% of melting index regulator, 20%-25% of mineral enhancer, 1.5-3% of scratch resistant agent and 1-2% of other assistants. The preparation method of the modified polypropylene material comprises the steps of mixing, extrusion and granulation. The material prepared by adopting the preparation method has high liquidity, rigidity and toughness, can well meet the usage requirements of the thin-wall automobile door panel and is low in cost. Compared with the prior art, a high-liquidity allyl elastomer is used as the melting index regulator, the liquidity of the material is remarkably improved, and the thin-wall door panel forming requirements are met. In addition, high-liquidity polypropylene and a low surface energy polymer are used in a mixed mode, and the tiger skin stripe defects on the surface of the thin-wall door panel can be basically eliminated.

The invention discloses low temperature resistant non-transparent high-impact random copolymerization polycarbonate, a preparation method and an application thereof. The random copolymerization polycarbonate is composed of a polycarbonate embedded section and a polysiloxane embedded section. The random copolymerization polycarbonate disclosed by the invention has excellent comprehensive property, excellent low temperature resistance and mechanical property, especially, high shock strength, better low-temperature shock strength, excellent processing property and practical application value.

The invention provides a polypropylene composition for water-heater inner containers, which comprises the following components in portions by weight: (a) 100 portions of homopolymerized polypropylene; (b) 0.01-10 portions of thermal stabilizer; (c) 0.01-10 portions of processing aid; and (d) 0.01-10 portions of alpha-crystal form nucleating agent and/or beta-crystal form nucleating agent. The processing aid is selected from one or a plurality of low-molecular-weight ester compounds, metallic soap compounds, stearic acid-compounded ester compounds and amide compounds. The polypropylene material of the invention overcomes the defect of insufficient rigidity of the common polypropylene, and has the advantage of high heat distortion temperature; and the tensile strength is greater than or equal to 20 MPa, the elongation at break is greater than or equal to 300%, the bending modulus is greater than or equal to 1200 MPa, and the notch impact strength is greater than or equal to 30 Kj/m<2>.

The invention relates to a low temperature impact resistant polycarbonate/ABS resin plastic alloy to mainly solve a problem that polycarbonate/ABS plastic alloys prepared through previous technologies have low temperature impact strengths and cannot satisfy some low temperature application requirements. The problem is well solved through a technical scheme that the plastic alloy comprises a polycarbonate resin with an appropriate molecular weight, a bulk polymerization ABS resin, an emulsion polymerization ABS resin, a compatilizer SMA resin, and auxiliary agents of an antioxidant and the like in the invention. The polycarbonate/ABS resin plastic alloy is especially suitable for the production of some low temperature application plastic products.

A creep-resistant atactic polypropene copolymer with optimized structure and performance is prepared through prepolymerizing catalyst; the catalyst entering the first liquid-phase reactor to contact propylene for polymerization, and then copolymerization by introducing ethylene; the materials after reaction, entering the second tiquid-phase reactor to containus copolymerization under the action of hydrogen, propene and ethyene; the above resultant entering the first gas-phase reactor for copolymerization; then entering the second gas phase reactor for copolymerization; entering a separator and then entering a dryer for final drying to obtain the polypropene powder.

The invention relates to a polypropylene-calcium carbonate filling master batch and a preparation method thereof. The filling master batch includes: 15-25 parts by weight of high rubber phase content polypropylene; and 75-85 parts by weight of calcium carbonate. The high rubber phase content polypropylene is a propylene-ethylene copolymer with a melt mass flow rate of 8-12g/10min, and the calcium carbonate is light calcium carbonate treated by a coupling agent. The preparation method includes: fully drying the calcium carbonate in a 120DEG C dryer, then putting the calcium carbonate into a 120DEG C high speed mixer, adding the coupling agent to conduct high speed stirring so as to activate the surface of the calcium carbonate, adding the high rubber phase content polypropylene, mixing them uniformly, and then carrying out extrusion granulation. The polypropylene composite material modified by the filling master batch prepared by the method can have effectively improved low temperature impact strength, flexural modulus, and load deformation temperature. Also, the preparation method provided by the invention is simple and is beneficial to operation. No expensive elastomer material is contained in the components, so that the material cost is reduced.

The invention discloses a cold-resisting halogen-free inflaming retarding ABS (Acrylonitrile Butadiene Styrene) material. The cold-resisting halogen-free inflaming retarding ABS material is composed of the following raw materials in parts by mass: 65-85 parts of ABS, 15-25 parts of a halogen-free flame retardant, 0-10 parts of a cold-resisting toughening agent, 0.5-2 parts of a lubricant and 0.5-2 parts of other auxiliary agents, wherein the halogen-free flame retardant is a complex of melamine salt, hypophosphite and a flame retardant synergist; the melamine salt is at least one of melamine cyanurate, melamine phosphate, melamine polyphosphate and melamine pyrophosphate. A preparation method of the cold-resisting halogen-free inflaming retarding ABS material comprises the following steps: (1) uniformly mixing all the raw materials; and (2) fusing and extruding the uniformly-mixed raw materials, cooling by water and dicing to obtain the product. The ABS material prepared by the invention has high impact strength and low-temperature impact strength, has excellent inflaming retarding performance and is free of halogen.

The invention discloses a calcium sulfate whisker modified ethylene-vinyl alcohol copolymer and a preparation process thereof. The calcium sulfate whisker modified ethylene-vinyl alcohol copolymer is prepared from the following raw materials in part by weight: 100 parts of ethylene-vinyl alcohol copolymer, 12 to 28 parts of calcium sulfate whisker, 8 to 15 parts of montmorillonite, 5 to 10 parts of polystyrene, 5 to 10 parts of hexadecyl quaternary ammonium salt, 1 to 4 parts of dioctyl phthalate serving as a plasticizer, and 1 to 3 parts of silane coupling agent KH550. The invention also discloses the preparation process for the calcium sulfate whisker modified ethylene-vinyl alcohol copolymer. The calcium sulfate whisker modified ethylene-vinyl alcohol copolymer has high low-temperature impact strength and bending strength and good blocking performance, and is particularly suitable for low-temperature packing occasions such as low-temperature fresh keeping transportation of fresh milk, fruits and seafood.

The invention provides a low-warpage high-impact-resistance long fiber-enhanced polypropylene composite material and a preparation method. A production raw material of the low-warpage high-impact-resistance long fiber-enhanced polypropylene composite material is prepared from the following components: 50 to 73 parts of polypropylene, 5 to 12 parts of a flexibilizer, 1 to 3 parts of a compatilizer,15 to 40 parts of glass fiber and 0.4 to 1.0 part of an antioxidant. A production method of the low-warpage high-impact-resistance long fiber-enhanced polypropylene composite material comprises the following steps: mixing all the components except the glass fiber, bracing and pelletizing the mixture to obtain a polypropylene resin semi-finished product, soaking the glass fiber into the melted polypropylene resin semi-finished product, and bracing and pelletizing the mixture to obtain the low-warpage high-impact-resistance long fiber-enhanced polypropylene composite material. The polypropylenecomposite material disclosed by the invention is relatively low in warpage performance, is also relatively high in low-temperature impact resistance and relatively good in mechanical property, and can be applied to a freezing environment.

Disclosed is an impact strength modifier (α) for a chlorine-containing resin, comprising a powder of a graft copolymer (A) obtained by graft polymerizing one or more kinds of vinyl monomers (b1) onto a polyorganosiloxane rubber (A1) or a composite rubber (A2) containing a polyorganosiloxane rubber and a polyalkyl(meth)acrylate rubber, wherein the specific surface area of the powder of the graft copolymer (A) measured by a nitrogen gas adsorption method is from 0.6 to 30 m²/g, and the pH of water used for extraction under conditions, in which (1) in an oven at 180° C., 5.0 g of the powder of the graft copolymer (A) is left to stand still and heated for 15 minutes, and (2) after the heating, the powder is dispersed in 100 ml of heated pure water and extracted for 1 hour at 70° C. while stirring, is from 4 to 11.

The invention discloses a high-temperature-resistant weatherproof fireproof chlorinated polyvinyl chloride (CPVC) corrugated board with low heat conductivity, and a preparation method of the chlorinated polyvinyl chloride (CPVC) corrugated board. The corrugated board is prepared from the following raw materials by weight: 10-60 parts of CPVC resin, 30-70 parts of PVC (polyvinyl chloride) resin, 1-8 parts of composite lead salt stabilizer, 1-4 parts of processing aids, 8-12 parts of anti-impact aids, 25-75 parts of filler, 1.5-4.5 parts of lubricant, and a reasonable amount of colorant. The corrugated board has the advantages of high mechanical strength, excellent weatherability, high aging resistance and chemical stability and the like, and the formed raised corrugated board has higher thickness uniformity and uniform stress distribution, thereby being not easy to break due to stress concentration.

The invention provides a rectangular refrigerator box frame and its manufacture method, the rectangular refrigerator box frame includes the frame body(1) which is composed of the front frame strip(11), the frame strip (12), the left frame strip (13) and the right frame strip (14), the states frame strips is made of the four same section plastics extruding strips, the each extruding strip beginnings and ends is equipped with the drift angle (4), the four extruding strip after the drift angle (4) of two terminal part butt-joint welds form the frame body (1); the interior angle(2) and the outer angle (3) of the four side angle in the rectangular refrigerator box frame body all process rotundity. The refrigerator box frame has low production cost, the strong interchange ability, the simple structure, the small assembly difficulty, the artistic contour, the high intensity of low temperature anti-impact, is not easy cracked under -10 deg-30 deg condition.

The invention discloses a high-flow super-tough cold-resistant material specially used for shells of PC electronic products. The material comprises the following raw materials: a PC resin, a flexibilizer, a functional aid, a compatilizer, an anti-oxidant and a processing aid. The invention further discloses a preparation method for the material specially used for the shells. According to the invention, physical and mechanical properties of the material can be substantially improved; the flexibilizer has excellent low temperature impact performance, improves low temperature impact strength of the material and enables the material to have good toughness at a low temperature of -40 DEG C; the functional aid has good fluidity and chemical resistance and can improve fluidity and chemical resistance of the material; the preparation method provided by the invention can rapidly prepare the special material with good fluidity, ultrahigh toughness, cold resistance and chemical solvent resistance, the material can be extensively used in the field of electric products like thin-wall shells of mobile phones and shells of earphones, and the preparation method has simple procedures and is easy to realize.

The invention relates to a high-barrier multilayer co-extrusion infusion film which is a five-layer composite film with the composition from the outer layer to the inner layer: polyethylene naphthalate modified polyester/ ethylene acrylic acid polymer/ polypropylene, ethylene- octylene copolymer blending resin/ ethylene propylene polymer/ modified polypropylene. The advantages of various functional polymer materials are combined by the high-barrier multilayer co-extrusion infusion film, so that not only are the light transmittance, the flexibility, the high barrier performance, the low-temperature thermal sealing property, the thermal bonding strength and the like of the high-barrier multilayer co-extrusion infusion film guaranteed, but also the high-temperature-resistant (121 DEG C and 30min) sterilization performance and the low-temperature-resistant (-30 DEG C) storage performance of the high-barrier multilayer co-extrusion infusion film can be improved; therefore, the matters (including nonvolatile matter, easily-oxidized matter, heavy metal and the like) dissolved out from the infusion film are fewer, a biological or chemical reaction is not caused between the infusion film and liquid medicine after filling sterilization, and toxin is not generated or environmental pollution is not caused when the infusion film is produced, used and recovered. Compared with other similar products, the high-barrier multilayer co-extrusion infusion film has excellent competitive advantages in the aspect of all technical indexes such as production formula, production technique and performances.

The invention discloses a polypropylene composite material which comprises 100 parts of polypropylene resin, 14 parts to 30 parts of super fine calcium carbonate filler with 6000 meshes to 7000 meshes and 7 parts to 15 parts of materials for elastic body. The surface treatment is carried out on the super fine calcium carbonate filler after the surface coupling treatment of the stearinic acid. Then the polypropylene resin, materials for the elastic body and the super fine calcium carbonate filler are directly put into a high-speed mixer for primary mixing, are mixed evenly at room temperature, and then is moved into a twin-screw extruding machine for even mixing and granulating. Compared with the prior art, the cost of the modified composite material filled by polypropylene equals to the cost of original polypropylene resin. In the invention, the enforcing conditions of the process is ordinary while the modified composite materials is on a par with the popypropylene resin before modification in rigidity and room-temperature impulse strength and low-temperature impulse strength are obviously improved.

The invention discloses a polyamide composition with good appearance, prepared from, by weight, 49-89% of thermoplastic polyamide resin, 0.01-10% of a maleic anhydride copolymer, 0-50% of a filler, 0-20% of an anti-impact modifier, and 0.01-20% of a polyhydroxy compound, wherein the maleic anhydride copolymer is one of alternating copolymers or block copolymers made by means of mass polymerization. The maleic anhydride copolymer of special structure is added into a polyamide system, so that melt strength and mechanical properties of the polyamide composition are improved; the polyhydroxy compound is introduced, so that the appearance of the polyamide composition is greatly improved, and the mobility worsening due to the introduction of maleic anhydride copolymers is particularly improved;the maleic anhydride copolymer is particularly suitable for processing or forming procedures having high melt strength requirement, especially extrusion molding, blow molding, foaming and the like.

The invention discloses a polyphenyl ether resin alloy material, a preparation method thereof and a refrigeration compressor. The polyphenyl ether resin alloy material is prepared from, by weight, 60-80 parts of polyphenyl ether resin, 5-15 parts of polystyrene resin, 5-10 parts of an elastomer, 10-20 parts of fire retardant, 1-10 parts of functional masterbatch and 0.20-0.50 part of antioxygen. The polyphenyl ether resin alloy material has excellent stress cracking resistance, low-temperature impact strength and a flame retardant property, the preparation method is simple in process, and production cost is effectively lowered. A shell of the refrigeration compressor contains the polyphenyl ether resin alloy material, so that the refrigeration compressor is stable in work performance, resistant to low temperature and safe.