204results about How to "Low molding shrinkage" patented technology

The invention relates to a mineral filled low-shrinkage modified polypropylene composite material which belongs to the field of modified polypropylene composite materials and comprises the following ingredients in parts by weight: 40 to 85 polypropylene, 5 to 30 polyethylene, 5 to 20 elastic bodies, 5 to 30 mineral filler, 0.1 to 3 compatilizers and 0.1 to 3 accessory ingredients. The mineral filled low-shrinkage modified polypropylene composite material prepared by the invention has good mechanical property, ensures good apparent performance of the composite material and has lower shrinkage. In addition, the method is simple and feasible and can be popularized and applied in a large scale.

The present invention relates to a glass fiber reinforced flame retardant polypropylene material for household appliance products, and belongs to the field of modified polypropylene plastic. The material comprises the following raw materials, by weight: a high-impact-resistance copolymer polypropylene resin, a bromine-based flame retardant agent, antimony trioxide, a flame retardant synergist, alkali-free continuous long glass fibers, a compatibility agent, a toughening agent, a lubricant, a UV absorber and an antioxidant. The present invention provides the glass fiber reinforced flame retardant polypropylene material with higher tensile strength, bending modulus and hardness as well as high impact-resistance, low molding shrinkage, aging resistance and the like. The glass fiber reinforced flame retardant polypropylene material has a high heat deformation temperature, good oxidation resistance at high temperature, and the flame retardant performance up to the level of UL94 V-2, and passes the glow wire test of GWIT: 700/3.0. The glass fiber reinforced flame retardant polypropylene material has a low cost and a light weight, and can be used instead of metal or plastic material to produce the household appliance products which need flame retardation and high temperature resistance.

The invention relates to a polyamide composition with high dimensional stability and a preparation method thereof. The polyamide composition comprises the following components in parts by weight: 60 to 90 of fatty polyamide composition, 2 to 10 of compatilizer, 1 to 10 of inorganic metal compound, 0 to 5 of polysiloxane with low molecular weight and 0 to 2 of auxiliary agent. The preparation method comprises the following steps of: premixing the raw materials in a high-speed mixer for 10 to 30min, controlling the temperature to be 40 to 60 DEG C, then adding premix into a double-screw extruder, conveying, melting, shearing, extruding, cooling and granulating so as to prepare a polyamide composition product with high dimensional stability. Compared with the prior art, the invention shows excellent dimensional stability and heat distortion temperature with high retention rate, is suitable for occasions with higher requirement to the dimensional stability, such as the panel of the air conditioner of an automobile, an instrument panel, a camera bracket, a sports apparatus and the like, and can be directly processed by injection molding or other forming methods.

The invention belongs to the technical field of high-molecular composite materials, and relates to a long glassfiber reinforced nylon composite material and a preparation method thereof. The composite material is prepared from the following components in parts by weight: 100 parts of nylon, 2 to 10 parts of compatilizer, 0.1 to 0.5 part of antioxidant, 0.2 to 1.0 part of lubricant and 10 to 40 parts of glassfibers. Compared with the short glassfiber reinforcement mode, according to the composite material provided by the invention, abrasions among short glassfibers, a screw rod and a feed cylinder are decreased during a double-screw extruding process, namely, the minimum fiber retained in an injection-molding product is large in length, so that the glassfiber reinforced nylon composite material with excellent performance is prepared. Thus, the applications of the glassfiber reinforced nylon composite material in the fields of automobiles, electric appliances, machinery, military industry and the like are enlarged.

The invention discloses a foaming composition for a water tank of a solar water heater, which is characterized by comprising the following main raw materials: a polyether foaming agent, sodium bicarbonate, chitosan and hollow glass beads. The improved polyether rigid foam composition can be used for reducing the phenomena that after being sprayed from a glossy jar and formed, a polyurethane material has high contractibility, the heat preservation effect of the water tank of the solar water heater is influenced and the water tank is deformed, bulged and barred, or even cracked.

The invention relates to the field of high polymer processing assistants and particularly relates to a calcium carbonate filler master batch for polypropylene and polyethylene and a preparation process thereof. The calcium carbonate filler master batch is prepared from the following ingredients in parts by weight: 60-80 parts of function-modified calcium carbonate whisker, 10-20 parts of carrier resin, 0.5-3 parts of coupling agent and 1-3 parts of lubricant, and is prepared through the steps of keeping all the ingredients at the temperature of 170-210 DEG C for 10-20 min and carrying out extrusion and granulation. The calcium carbonate filler master batch has the advantages that the cost is relatively lower, inorganic particles are uniformly dispersed in a high-polymer matrix, the combination between the inorganic particles and the high-polymer matrix is better, the calcium carbonate filler master batch has bacterium resisting and inhibiting properties, and mechanical properties, such as tensile strength, notched impact strength, wear resistance and the like, are improved.

The invention discloses a preparation method of a single-component water-based polyurethane adhesive for use in flexible package compounding. The method comprises the following steps: reacting polyisocyanate with polyester polyol and polyether polyol, adding a chain extender, and continually reacting to obtain a polyurethane prepolymer; continually reacting epoxy resin with a modifier of a silane coupling agent to obtain a modified polyurethane prepolymer; cooling the modified prepolymer, neutralizing and salifying, and adding water for high-speed dispersion to obtain the single-component water-based polyurethane adhesive for use in flexible package compounding. The method is simple in preparation process, and the obtained single-component water-based polyurethane adhesive is convenient to use.

The invention provides a resin-based composite material with a controllable linear expansion coefficient and a preparation method thereof. The composite material is characterized by mainly comprising the following components in parts by weight: 10 parts of unsaturated polyester resin, 2-30 parts of filling material, 2-20 parts of fiber, 1-5 parts of low shrinking agent, 0.6-2 parts of mould release agent and 0.2-1 parts of initiator, wherein the filling material and fiber are materials with negative expansion coefficients or low expansion coefficients. The preparation method comprises the following steps: evenly mixing 1-5 parts of low shrinking agent, 0.6-2 parts of mould release agent and 0.2-1.5 parts of initiator with 10 parts of unsaturated polyester resin; then adding 2-30 parts of filling material and 2-20 parts of fiber for evenly mixing again; and finally, carrying out compression molding at the temperature of 140-160 DEG C. The linear expansion coefficient of the material provided by the invention is adjustable within a range of (8-30)*10<-6>/ DEG C, and the material provided by the invention has isotropy.

The invention discloses an in-situ compatibilization PO/PS (polyolefin/polystyrene) alloy and a preparation method and application thereof. The alloy is prepared by 45-65% of polyolefin, 10-30% of polystyrene, 2-5% of compatibilization initiation mother liquor and 20-25% of processing agent, and the compatibilization initiation mother liquor is obtained by dissolving crosslinking agent and crosslinking agent auxiliaries to oily carrier., wherein the crosslinking agent is at least one of 2, 5-dimethyl-2, 5-di (tertiary butyl peroxide) hexine, 2, 5-dimethyl-2, 5-di (tertiary butyl peroxide) hexane or dicumyl peroxide, and the crosslinking agent auxiliaries is at least one of liquid polybutadiene, prussic acid ester type substances, isocyanate substances or acrylate substances. Compared withthe dynamic sulfuration in-situ compatibilization method and the common compatibilization method, the preparation of the in-situ compatibilization PO/PS alloy is capable of effectively reducing production cost of the PO/PS alloy, the PO/PS alloy prepared has lower molding shrinkage rate, higher modulus and excellent overall performance and can be used as substitutes for acrylonitrile butadiene styrene partially.

The invention discloses a low-shrinkage modified polypropylene material. The material is prepared from the following raw materials in parts by weight: 40-80 parts of polypropylene resin, 2-5 parts of tetrapod-shaped ZnO whisker, 10-20 parts of inorganic powder, 0.05-1.2 parts of an alpha-nucleating agent, 1-5 parts of an anti-oxidant, and 5-30 parts of high density polyethylene; the polypropylene resin is co-polypropylene K9026, and in a test condition of 230 DEG C x 2.16kg, the melt flow rate of the co-polypropylene K9026 is 30g/10min. Synergism of the whisker, the high density polyethylene and the inorganic powder is used, especially the tetrapod-shaped ZnO whisker is added, so that the moulding shrinkage of the polypropylene is substantially reduced, and the mechanical property of the material is substantially improved.

The invention discloses a preparation method of high-performance modified polysulfone resin. Monomers such as bisphenol A, 4,4'-dichlorodiphenyl sulfone and chain extender are used for preparing polysulfone resin, and then modification is conducted on the polysulfone resin through fibers, wherein when modification is conducted, a mixture comprises the components of 50%-90% of the polysulfone resin, 10%-50% of the fibers and 0.1%-5% of auxiliaries. According to the prepared high-performance modified polysulfone resin, the heat resistance is good, mechanical properties such as the stretching strength, the tensile strength, the tensile strength and the impact toughness can all be greatly improved after modification, and other excellent properties are kept constant.

The invention relates to a wear-resistant high-impact-resistance nylon composite material which comprises the following components in parts by weight: 20-80 parts of nylon resin, 10-50 parts of fiber material, 10-40 parts of anti-wear agents, 0.1-2 parts of surface treating agent perfluoropolyether, 0.1-1.0 part of lubricant and 0.1-0.6 part of antioxidant. The preparation method comprises the following steps: uniformly mixing different types of anti-wear agents at medium speed; heating to 90-100 DEG C, adding the perfluoropolyether, and uniformly mixing at high speed; adding the nylon resin, lubricant and antioxidant, and continuing mixing uniformly; and carrying out melt blending extrusion, drawing, cooling, and granulation on the obtained mixture and fiber material through a double screw extruder, thereby obtaining the wear-resistant high-impact-resistance nylon composite material. The wear-resistant high-impact-resistance nylon composite material has the advantages of low friction factor, favorable wear resistance, high mechanical strength, favorable heat resistance, excellent toughness, excellent impact resistance, low mold shrinkage rate, favorable dimensional stability, favorable flowability and high processability.

The invention provides a high-gloss polypropylene material which is characterized by being obtained by physical modification and comprising the following components: 100 parts of polypropylene, 20-35 parts of barium sulfate, 5-20 parts of POE (polyolefin elastomer), 0.1-0.4 part of nucleating agent, 0.1-0.2 part of antioxidant 1010, 0.1-0.2 part of antioxidant 168 and 0.1-0.3 part of lubricant. The modified PP aggregates have low forming shrinkage, high gloss and high toughness and have the advantage of elegant and attractive appearance of acrylonitrile butadiene styrene. Meanwhile, the cost is greatly reduced.

The invention discloses a construction method of a bridge pile foundation in a mountainous area. The construction method comprises the following steps: (1) staking out in survey, namely locating position of the pile foundation; (2) digging a hole, namely enlarging hole on the bottom rock of a pile hole after digging the pile hole to form an enlarge hole cavity; (3) placing a steel reinforcement cage and an enlarged steel reinforcement cage, namely placing a main steel reinforcement cage in the pile hole and placing the enlarged steel reinforcement cage in the enlarged hole cavity; (4) pouring concrete, namely pouring concrete into the pile hole by adopting a guide pipe method and manufacturing a bearing platform; and (5) arranging anchor cables, namely drilling around the pile foundation, mounting a vertical anchor cable and a horizontal anchor cable, grouting by adopting a hole bottom grout returning method, and punching the vertical anchor cable and the horizontal anchor cable into the rock by passing through the soil layer. The construction method is simple; the pile foundation bearing capability is strong.

The invention discloses a multi-injection molding process one-time molding method for a high-toughness home appliance panel. The multi-injection molding process one-time molding method is characterized by comprising the following steps of preparing materials for injection molding; inputting relative parameters of the four-stage injection molding process on a control panel of an injection molding machine; pushing a manual/automatic change-over switch on an electric control cabinet to the automatic position; inputting location parameters and pressure holding parameters of a screw rod on a touchinput screen when completion of filling meeting process switching conditions; closing a safety door of the injection molding machine, pressing an on/off switch in an on position to start the injectionmolding machine; and opening a mold and taking out workpieces after completion of injection molding. According to the multi-injection molding process one-time molding method, the injection molding machine is controlled by a PLC to conduct regulation to adopt different injection molding processes at different injection molding stages according to data stored from the control panel of the injectionmolding machine. Meanwhile, compared with a bonded panel, the panel manufactured through multi-injection molding one-time molding has the good integrity and toughness and is not likely to get bent and fall off.

The invention discloses a polypropylene complex. The polypropylene complex comprises, by mass, 59.15-69.4% of polypropylene (PP), 20-25% of talcum (Talc), 10-15% of rubber, 0.05-0.1% of a main antioxidant, 0.10-0.15% of a secondary antioxidant, 0.15-0.2% of a light stabilizer, 0.15-0.2% of polyethylene wax and 0.15-0.2% of a dispersing agent. The present invention further relates to a preparation method for the polypropylene complex. The forming shrinkage of the polypropylene complex is decreased, and the mechanical properties of the polypropylene complex are significantly increased, such that the PP can be effectively prevented from degradation aging during the processing and using process.

The invention relates to a polyurethane grouting liquid and specifically relates to a preparation method of an oil-soluble polyurethane grouting liquid. The preparation method of the oil-soluble polyurethane grouting liquid comprises the following steps of: firstly preparing a prepolymer with the -NCO content of 9.5-17.5%, further performing heat preservation, then cooling, and adding a toluene type solvent and a catalyst so as to prepare the oil-soluble polyurethane grouting liquid. The oil-soluble polyurethane grouting liquid prepared by the method disclosed by the invention has the advantages of stability, small shrinkage rate in forming, difficulty in crust formation and easiness in storage. The method has the advantages of simplicity, convenience, quickness and effectiveness, anti-seepage and leakage stoppage effects can be realized, and a certain structure reinforcing effect can be further realized. An oil-soluble polyurethane grouting technology is particularly suitable for waterproof treatment against dynamic seepage of underground works and can be widely applied to the fields of water conservation, hydropower, tunnels, municipal administration, industrial and civil buildings and the like.

The invention discloses a heat-resistant impact-resistant low-floating-fiber short-fiber reinforced PBT/ABS alloy material for an electrical equipment shell, and a preparation method thereof. According to the key point of the technical scheme, the heat-resistant impact-resistant low-floating-fiber short-fiber reinforced PBT/ABS alloy material for the electrical equipment shell consists of the following components in percentage by weight: 20 to 60 percent of PBT, 15 to 60 percent of ABS, 0.2 to 0.5 percent of a coupling agent, 3 to 8 percent of a toughening agent, 0.2 to 0.5 percent of an antioxidant, 0.5 to 1.5 percent of a lubricating agent and 10 to 30 percent of short fiber. The heat-resistant impact-resistant low-floating-fiber short-fiber reinforced PBT/ABS alloy material for the electrical equipment shell, provided by the invention, solves the floating fiber problem of a long-glass-fiber reinforced PBT/ABS alloy material and the problem that a short-glass-fiber reinforced ABS material is low in notch impact strength and low in heat deformation temperature.