559results about How to "Shorten molding cycle" patented technology

The invention provides a method for preparing a polymer microporous foaming material by supercritical mould foaming. The method comprises the following steps of: heating a foaming mould on a mould press to the foaming temperature; placing a polymer into the mould; closing the mould by using the mould press; sealing the mould; introducing supercritical fluid, which swells and diffuses to the polymer, into the mould; and opening the mould by using the mould press to release pressure and foam to obtain the polymer microporous foaming material. Compared with the prior art, the method has the advantages that: the high-temperature and high-pressure supercritical fluid is used for swelling the polymer, so the moulding cycle is greatly shortened; the limit that only microporous foaming sheet material with lesser thickness can be manufactured in the prior art is broken through, so a polymer microporous foaming plate with greater thickness can be manufactured; when the mould is opened, the pressure-releasing speed is high and the foaming pore core-forming speed is high, so the formed microporous foaming material has smaller foaming pores, higher pore density and more excellent performance; and multiple layers of moulds can be placed on one mould press, so the method is suitable for industrialized scale production.

The present invention discloses pulse type shock reinforced in-line mixing and injecting forming method and apparatus. Pulse type shock is introduced into the whole in-line mixing and injecting forming process of producing fiber reinforced composite polymer material. The apparatus includes one plasticizing extruder with three screws arranged in one line and including one main screw capable of generating periodical axial pulse shock, one buffering storing device, and one pulse type shock pressure reinforcing plunger injecting device. The present invention can lower melt viscosity, raise mixing and homogenizing effect, raise the compatibility between fiber and polymer, lower the processing power consumption and raise product quality.

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 relates to a high-molecular-weight polymer nucleating agent-modified ultrahigh-molecular-weight polyethylene blend material. The blend material comprises the following raw materials by weight: 60 to 100 parts of UHMWPE, 5 to 12 parts of HDPE, 6 to 16 parts of LLDPE, 0.1 to 3 parts of a high-molecular-weight polymer nucleating agent and 1.5 to 3 parts of a flow modifier. The high-molecular-weight polymer nucleating agent has the advantages of no odor, good dispersibility, good compatibility, capacity of realizing heterogeneous crystallization, a high degree of crystallization and a small application amount; the high-molecular-weight polymer nucleating agent-modified ultrahigh-molecular-weight polyethylene blend material retains original characteristics of polyethylene UHMWPE and has obviously improved tensile strength, impact strength, bending strength, Vicat softening temperature, elongation at break and Shore hardness and a reduced mortar wear rate.

Poly(1-butene) resin composition comprises 90-99.95 wt.% of a poly(1-butene) resin (A) which is obtained by copolymerizing 80-100 mol% of 1-butene with 0-20 mol% of a 2-10C α -olefin except 1-butene and has 0.01-50 g/10 minutes MFR (190 deg.C) and 0.05-10 wt.% of a polypropylene resin (B) having 0.01-50 g/10 minutes MFR (230 deg.C). This pipe and this joint for a pipe comprise the composition. According to this present invention a poly(1-butene) resin composition capable of preparing a pipe which shortens a curing time and reduces a molding cycle, namely has excellent productivity and excellent winding properties after extrusion molding, its pipe and a joint suitable for the pipe in which the pipe is suitable for a fluid transportation pipe such as a water supply pipe, a warm water supply pipe, etc., and the joint for a pipe is preferably useful as the joint for the pipe.

The invention discloses a polyactic acid/polycarbonate alloy material, and a preparation method and application thereof. The polyactic acid/polycarbonate alloy material comprises the following raw materials in part by weight: 10 to 90 parts of polycarbonate, 10 to 90 parts of polyactic acid, 1 to 20 parts of liquid crystal high polymer and 1 to 25 parts of flexibilizer. The polyactic acid/polycarbonate alloy material is prepared by adding the raw materials into a double-screw extruder to be melted and blended. The polyactic acid/polycarbonate alloy material provided by the invention has environmentally-friendly characteristics and excellent physical and mechanical properties, and greatly improves impact strength, bending modulus and heat distortion temperature. The liquid crystal high polymer is added to promote the quick crystallization of the polyactic acid, so that the prepared polyactic acid/polycarbonate alloy can be formed quickly, the forming cycle is reduced from 80 seconds to50 seconds, processing cost is reduced, flowability and fire resistance are improved, and the polyactic acid/polycarbonate alloy material is applicable in the fields of office automation (OA) equipment, communication equipment, automobile parts, domestic appliances and the like.

The invention discloses a waste PET (Polyester) heat-proof tackifying and reinforcing composite material and a preparation process thereof. The preparation raw materials of the waste PET heat-proof tackifying and reinforcing composite material include a waste PET material, a nucleating agent, a compound chain extender, a toughening agent, a reinforcing agent, a dispersant and an antioxidant. When the waste PET heat-proof tackifying and reinforcing composite material is prepared, a first mixture formed by mixing the waste PET material and the toughening agent is added from a main feed port, the nucleating agent, the compound chain extender, the dispersant and the antioxidant are added from a powder side beside the main feed port in a feeding way, and the reinforcing agent is added from the feed port positioned at an extruder side, so that a small amount of powdery auxiliary agent and a main material can be uniformly mixed and the quality of a finished material is enhanced in such a unique charging way. The preparation process of the waste PET heat-proof tackifying and reinforcing composite material, which is disclosed by the invention, has the advantages of simple process and easiness for industrialization; and the waste PET heat-proof tackifying and reinforcing composite material disclosed by the invention has the advantages of high crystallization rate, high heat-proof temperature and excellent mechanical property.

The invention involves a counter-pressure chemical foaming high speed injection moulding shaping method. The invention provides a method which utilizes injection moulding shaping machine equipment, and dies, general gas energy, plastic raw materials and other system resources comprehensively, produces thick-wall plastic-foam product high speed and high effectively. The invention first closes the die and injects gas into die cavity, then injects molten material into die cavity, the welding fluid is full of die cavity after inner foaming, the molten material surface is closed to the metal wall-surface of die cavity, the molten material in die cavity is solidified and shaped after cooled, then opens the moving mold and static mold, the plastic products are prepared which surface is smooth and dense and inner is distributed with uniform foam. The invention can eliminate or reduce the converging cave and warping deformation of product surface, reduces injection moulding pressure, thereby reduces the lock-mode pressure of injection machine; reduces equipment operating costs, thereby improves the size accuracy and strength of products, can reduces 15% ~ 35% raw material consumption effectively, products have higher mechanical property and weight proportion.

The invention relates to a flame-resistant PC (Polycarbonate)/PBT (Polybutylene Terephathalate)/PET (Polyethylene Terephathalate) alloy and a preparation method thereof. The alloy is prepared from the following components in percentage by weight: 30-50 percent of PC, 10-30 percent of PBT, 10-20 percent of PET, 3-8 percent of toughening compatibilizer, 9-15 percent of flame retardant, 4-8 percent of flame-resistant synergistic agent, 0.4-1 percent of antioxidant and 0.4-1 percent of processing aids, wherein the flame retardant is one of bromine brominated epoxy resin, brominated polystyrene and decabromodiphenylethane, the toughening compatibilizer is an ethane-methyl acrylate copolymer and (or) an ethane-methyl acrylate-methacrylic acid glycidyl ester copolymer. The preparation method of the flame-resistant PC/PBT/PET alloy comprises the following steps of: drying raw materials; fully mixing; stirring for 10-20min at a room temperature; and melting, blending and extruding. The alloy phase has excellent comprehensive performance and high performance price ratio, reaches the flame-resistant level of UL94-V0 and can meet the special use requirements of a certain places.

The invention discloses a low-warpage carbon-fiber-reinforced PET/polyester alloy and a preparation process thereof. The PET/polyester alloy comprises, by weight, 40-65% of PET, 7-30% of polyester, 0.5-1.5% of a polyester nucleating agent, 10-40% of carbon fibers, 3-10% of a compatilizer, 0.5-1% of an antioxidant and 0.5-1% of a lubricating agent. The preparation process comprises the steps of firstly, placing the PET, the polyester, the polyester nucleating agent, the compatilizer, the antioxidant and the lubricating agent into a highly mixing machine for mixing for 3-5min, then adding from a first section barrel of a double-screw extruder, adding the carbon fibers from a fourth section barrel of the double-screw extruder, controlling the revolving speed of the double-screw extruder to be 35-40Hz, and performing extruding granulating at the temperature of 240-250DEG C, so that the low-warpage carbon-fiber-reinforced PET/polyester alloy which is high in mechanical property, short in molding cycle and attractive in product appearance is obtained.

The invention discloses a preparation method of a rapid prototyping material. The preparation method comprises the steps of providing raw materials, wherein raw materials comprise the following ingredients in parts by weight: 85-97.5 parts of engineering plastics, 0.5-5 parts of nanocellulose and 2-10 parts of viscosity reducer; (S1100) weighing the raw materials: drying the raw materials for 4-10 hours at the temperature of 105 DEG C, and then, weighing the raw materials according to a weight ratio; (S1200) carrying out blending modification: carrying out three-dimensional stirring and blending on the weighed raw materials for 30-90 min; and (S1300) sieving: sieving the blended raw materials by using a sieve of 70-140 meshes. The invention further discloses the rapid prototyping material obtained through the preparation method. According to the rapid prototyping material disclosed by the invention, the preparation process is simple, and the industrialization is easy to realize; and the material is short in prototyping cycle, good in thermal stability and high in mechanical strength.

The present invention discloses one kind of fast formed nylon-66 resin and its preparation process. The fast formed nylon-66 resin has main material including nylon-66 in 66 100 weight portions, and nucleater in 10-4-1 weight portions. It is prepared through vacuum drying nylon-66 powder and mixing nylon-66 powder and nucleater in a high speed kneading machine. Or, the nucleater is added during polymerizing nylon-66 for well mixing to obtain the fast formed nylon-66 resin. The present invention has simple preparation process suitable for industrial production, and the fast formed nylon-66 resin has short forming period and raised mechanical performance.

The present invention provides a molding method capable of molding a thick-walled light guide plate of high quality by a short molding cycle. A predetermined amount of a molten resin is charged in the shaping space K constituted of the stamper (8) provided to the core (4) on the cavity side of a fixed mold, the core 23 on the core side of a movable mold and cores 30 and 30 on the peripheral wall side of the movable mold. Then, a valve gate is closed to compress the molten resin by the core 23 on the core side. Transfer properties are enhanced by compression and the molding cycle is shortened. At the time of compression, the temperature of the cores (30 and 30) on the peripheral wall side is made higher than the temperature of the core (4) on the cavity side and the core (23) on the core side. By this constitution, the cooling speed of the cores (30 and 30) on the peripheral wall side becomes slow to enhance a compression effect and the occurrence of a sink is suppressed.

The invention provides a composite material of shell micro powder filling bio-based resin and a method for preparing the same. The composite material comprises the following component in percentage by mass: (1) 20 to 60 percent of shell micro powder, 40 to 80 percent of bio-based resin, 1.5 to 8 percent of coupling agent and 0.2 to 0.4 percent of anti-oxidant; and or 20 to 60 percent of shell micro powder, 40 to 80 percent of bio-based resin, 0.6 to 3 percent of isocyanate, 0.05 to 0.1 percent of organic tin or organic stannous catalyst, and 0.2 to 0.4 percent of anti-oxidant. The invention also discloses a method for preparing the composite material. The method has the advantages of utilizing the ultrasonic cavitation to grind and disperse the shell micro powder, simultaneously accelerating the grafting or chemical bonding of the coupling agent or isocyanate on the surface of the shell micro powder, greatly shortening the modification time of the shell micro powder and the forming period of the composite material, and improving the interface compatibility and the bonding strength of the shell micro powder and the bio-based resin. The composite material is widely applied in fields of the production and consumption of automobile interior parts, stationery, road blocks, sporting goods, food bags, refuse bags, disposable tablecloth, outdoor flower pots, canteens, knives and forks and the like.

The invention relates to a low-density automobile back door plate module and a preparation method thereof. The preparation method is used for reducing self weight of automobile back door plate modules and overcoming appearance defects of sink marks, warping deformation and the like. The low-density automobile back door plate module uses modified polypropylene particles and foaming masterbatches as raw materials and is produced through mixing injection molding, and the mass ratio of the modified polypropylene particles and the foaming masterbatches is 100: (1-4). According to the low-density automobile back door plate module and the preparation method thereof, the modified polypropylene particles and the foaming masterbatches are used as the raw materials, conventional injection processes are improved according to raw material characteristics and molding requirements, and a high-pressure high-speed injection process is used, so that the intensity of produced injection products is lower than that of ordinary polypropylene modules by 10%-15%, 10%-15% of a molding period can be shortened, the usage quantity of the raw materials is saved, and the molding period can be substantially shortened.

The invention relates to a mini-type iron piece automatic buried molding mechanism. The mechanism comprises a bearing jig and an insert jig, wherein the bearing jig is internally provided with bearing jig photoelectric inductors and bearing jig guide sleeves; the insert jig is provided with jig positioning columns and insert jig photoelectric inductors; the jig positioning columns and the bearing jig guide sleeves are mutually matched; the bearing jig photoelectric inductors and the insert jig photoelectric inductors are mutually induced; the insert jig is connected to a mechanical arm solenoid valve through an air cylinder; positioning pins in the insert jig and mold guide sleeves are matched and positioned; mold product positioning columns and a product are positioned; and weak magnets are matched with and adsorb iron pieces. The mechanism is simple in structure and stable and reliable in movement, is a mechanical type automatic mechanism and does not need subsequent manual operation, and therefore the labor intensity of workers is alleviated; and the production efficiency is greatly increased and automatic production is achieved.

The invention discloses a polypropylene series resin composite foam particle, and a preparation method and an application thereof, and belongs to the technical filed of foam materials. Technical problems of high molding pressure in a polypropylene series resin composite foam particle die, high preparation cost and long molding cycle in the prior art are solved. The foam particle is prepared through a dispersion medium release technology of blended resin particles, the cell diameters of the foam particle sequentially increase from inside to outside, and the average cell diameter Rs of a skin layer and the average cell diameter R0 of a core layer meet the following relationship: Rs/R0 is not smaller than 1 and not greater than 5; and the blended resin particles contain matrix resin and an inorganic separant, the mass fraction of the inorganic separant is 1-20%, the matrix resin is polypropylene series resin, and the inorganic separant is a layered inorganic substance. When the foam particle is used to prepare a foam body, the steam consumption is greatly reduced, the forming cycle is shortened, and the preparation cost is reduced; and the foam body obtained in the invention has smooth surface and excellent compliance.