344 results about "Screw speed" patented technology

The invention discloses glass fiber reinforced flame retardant engineering plastic and a preparation method thereof. Besides glass fiber, 30-70 parts of polycaprolactam, 8-30 parts of acrylonitrile-butadiene-styrol copolymer, 3-6 parts of compatilizer, 12-16 parts of flame retardant, 0.3-0.5 parts of antioxidant and 0.3-0.8 parts of lubricant are put in a high-mixing machine to blend for 2-5 minutes, then the blending material is put in a double screw extruder; meanwhile, 18-35 parts of glass fiber are put in the rear half section of the double screw extruder to mix together to be granulated and molded; wherein, the processing temperature is 180-245 DEG C and the screw speed is 240-560 revolutions per minute. The prepared glass fiber reinforced flame retardant engineering plastic is characterized by high size stability, large mechanical strength, excellent heat resistance, etc. The combustibility can reach UL94 V-0(1.6mm) level, thus expanding the application in electronics.

The invention relates to a PC / ABS alloy with excellent hydrolysis resistance and a preparation method thereof; the alloy comprises the following components in parts by weight: 50 to 70 parts of PC, 30 to 40 parts of ABS, 5 to 10 parts of compatibilizer, 5 to 10 parts of toughener, 0.1 to 1 part of hydrolysis agent, 0.1 to 1 part of lubricant and 0.1 to 1 part of antioxidant; the components are prepared in the parts by weight, put into a medium-speed mixer to be mixed for 20min, to prepare mixed material; and finally the mixed material is put into a twin-screw extruder, the rotating speed of the screws is controlled to be 180 to 600rpm, the material is melted, extruded and granulated, and the product is prepared. Compared with the prior art, the PC / ABS provided by the invention adopts ABS and the hydrolysis agent which are specially synthesized, thereby not only improve the mechanical performance of the material, but also improving the hydrolysis resistance of the PC / ABS alloy.

An injection molding machine 1 includes mode selection means 8 that can selectively switch between a first control mode M1 and a second control mode M2. In the first control mode M1, control is performed by a first control system Cf in which a screw speed is controlled by feedback with a speed detection value Vd that is detected by screw speed detection means 5 and a speed target value Vfc, and an injection pressure is controlled by feedback with a pressure detection value Pid that is detected by injection pressure detection means 6 and a pressure target value Pic, whereas, in the second control mode M2, control is performed by a second control system Cs in which the screw speed is open-loop controlled with a speed target value Vsc, and a pump pressure is controlled by feedback with a pressure detection value Ppd that is detected by pump pressure detection means 7 and that is related to the pump pressure of the hydraulic pump 4 and a pressure target value Ppc.

The invention discloses a high-impact glass fiber reinforced flame retardant engineering plastic and a preparation method thereof. Besides glass fiber, 30-60 parts of polycaprolactam, 8-25 parts of acrylonitrile-butadiene-styrol copolymer, 3-6 parts of compatilizer, 4-10 parts of toughener, 12-16 parts of flame retardant, 0.3-0.5 parts of antioxidant and 0.3-0.8 parts of lubricant are put in a high-mixing machine to blend for 2-5 minutes, then the blending material is put in a double screw extruder; meanwhile, 18-30 parts of glass fiber are put in the rear half section of the double screw extruder to mix together to be granulated and molded; wherein, the processing temperature is 180-245 DEG C and the screw speed is 240-560 revolutions per minute. The prepared high-impact glass fiber reinforced flame retardant engineering plastic is characterized by high size stability, large mechanical strength, excellent heat resistance, high combustibility that is up to UL94 V-0(1.6mm), etc.

The invention provides a thermoplastic elastomer material which consists of the following ingredients according to weight percentage: (A) 30-80% of polyolefin resin and 20-70% of hydriding styrenic thermoplastic elastomer. The MFR of the polyolefin resin is 2-7, which is measured according to ISO1133 standard (the temperature is 230 DEG C, the load is 2.16kg). The thermoplastic elastomer material is obtained by mixing the ingredient (A) and the ingredient (B) at the melt temperature of 210-220 DEG C and the screw speed of 300-450rpm.

The invention discloses a polylactic acid modified material which comprises the following components in percentage by mass: 40-90% of polylactic acid, 5-30% of polyether type polyamide elastomer and 5-30% of montmorillonite. The preparation method of the polylactic acid modified material comprises the following steps: drying polylactic acid and polyether type polyamide elastomer in a vacuum drying oven at 70 DEG C for 24 hours, drying montmorillonite in a vacuum drying oven at 100 DEG C for 24 hours, and carrying out melt blending on the polylactic acid, polyether type polyamide elastomer and montmorillonite in a twin-screw blender to obtain a blend system, wherein the blending temperature is 170-190 DEG C, the screw speed of the twin-screw blender is 40-100 rpm, and the blending time is 5-10 minutes; and after drying the blend system, and carrying out injection molding with an injection molding machine to obtain the modified material, wherein the cylinder temperature of the injection molding machine is 170-190 DEG C, the mold temperature is 50 DEG C, and the injection molding cycle is 40-60 seconds. The invention has the advantages of high tensile strength and excellent elongation at break.

The invention discloses walnut meal composite nutrition powder and a preparation technology of the walnut meal composite nutrition powder. The preparation technology of the walnut meal composite nutrition powder comprises the steps that (1) pearl barley powder and walnut meal powder serve as main raw materials, extrusion processing is carried out on the raw materials through a bulking machine under the conditions that the extrusion temperature is 150DEG C-170DEG C, and the screw speed is 540-580r / min, and pearl barley and walnut powder extruded materials are obtained; (2) the extruded materials are smashed to form powdery materials with the specification of being larger than 100 meshes, the powdery materials are placed into a homogenizer, sucrose and water are added, high-pressure homogeneity processing is carried out under the conditions that the pressure is 20-25MPa, and the temperature is 70-80DEG C, then, composite probiotics inoculated fermentation processing is carried out on the materials to form walnut meal composite fermentation liquid, and spray drying processing is carried out on the walnut meal composite fermentation liquid to obtain the walnut meal composite nutrition powder. The walnut meal composite nutrition powder and the preparation technology of the walnut meal composite nutrition powder have the advantages of being simple in processing technology, low in manufacturing cost, capable of making full use of the nutrition complementary advantage of the raw materials, capable of achieving all nutritional functions of the walnut meal raw materials, good in quality of products, good in taste of the products, rich in nutrient of the products, stable in quality and performance of the products and the like.

The invention discloses a polypropylene modified material for an expansion water tank of an automobile and a preparation method thereof and belongs to the technical field of auto part manufacturing. The polypropylene modified material for the expansion water tank for the automobile comprises the following components in percentage by weight: 75-85 percent of propylene-ethylene block polypropylene copolymer, 10-20 percent of linear low density polyethylene (LLDPE) resin, 2-5 percent of ethylene propylene diene monomer (EPDM), 0.1-0.5 percent of nucleating agent and 0.1-0.5 percent of antioxidant. After being mixed according to the proportion, the materials are extruded and granulated by a double screw extruder under the conditions that the processing temperature is 210-240 DEG C, and the screw speed is 210-240 revolutions / minute. The polypropylene modified material has the beneficial effects that polypropylene is modified by the reasonable components according to the mixing proportion, so that the material has higher low-temperature impact strength and higher high-temperature creep resistance; and meanwhile, the hot plate welding performance of the material is improved, the material transparency is improved, and the production processing requirements and the use requirements of the expansion water tank for the automobile are completely satisfied.