40results about How to "Eliminate flow marks" patented technology

The invention discloses a spraying-free polyester composition having special aesthetic effects and a preparation method and an application thereof. The spraying-free polyester composition comprises the following components: 70-98 wt% of polyester, 1-25 wt% of microspheres formed by coating a special-effect powder with a polymer, 0-10 wt% of a compatibilizer, 0.1-1 wt% of an antioxidant, and 0.1-0.5 wt% of a processing auxiliary agent. The special-effect powder is coated with a water-based polymer dispersion liquid to form the microspheres, and then the microspheres are dispersed to the polyester, so that the compatibility of the special-effect powder and the polyester can be significantly improved, flow marks formed on the surface of products in an extrusion or injection molding process are eliminated, and weld lines are reduced; and the prepared spraying-free polyester composition has relatively obvious metal texture, pearly flashing effects and other special aesthetic effects, and the market application range of spraying-free materials is greatly improved.

The invention discloses a steam type highlight and traceless injection-molding and forming process for a complex precise product. The process sequentially comprises the following steps of: selecting raw materials, baking, pre-heating, combining a die, then quickly heating, adjusting speed and pressure, injecting in sections, maintaining the pressure, cooling quickly, blowing out cold air, opening the die and cleaning the die. An advanced pressure-regulation and speed-regulation staging injection process and an automatic blowing and impurity-removing technology are adopted in the invention. A special heating and cooling technology is that the shapes, the widths and the arrangement density of water passages are designed according to nonuniform heat and cold of the complex precise product in the injection-molding and forming course and the overall shape variation of the product. The steam type highlight and traceless injection-molding and forming process for the complex precise product has the advantages that the residual stress of the product is effectively decreased, various defects generated in the course of producing the plastic product are greatly reduced, the surface quality and the precision of the product are remarkably improved, and the life of the product is remarkably prolonged at the same time because the special process ensures heating and cooling rates of each part of the complex product in the injection-molding and forming course tend to be consistent.

The invention relates to the technical field of polymer materials, in particular to a high-gloss spraying-free ABS (acrylonitrile butadiene styrene) composite material with special effect and a preparation method thereof. The composite material comprises, by weight: 70-90 parts of ABS resin, 4.0-10 parts of a compatilizer, 5.0-10 parts of a toughener, 1.0-3.0 parts of white oil, 0.4-0.6 part of a composite antioxidant, 0.5-1.0 part of a lubricant, and 1.0-5 parts of pearl powder. The preparation method is simple, and the prepared ABS composite material has good mechanical properties, low aid emigration rate, significant pearl effect, smooth surface free of flow marks and scratch resistant, and long service life.

The invention discloses a spraying-free ABS composition with a special aesthetic effect, a preparation method and applications thereof. The ABS composition consists of 70 to 98 wt% of ABS resin, 1 to 25 wt% of polymer-coated microspheres with a special effect, 0 to 10 wt% of compatilizer, 0.1 to 1 wt% of antioxidant, and 0.1 to 0.5 wt% of processing aid. The powder with a special effect is coated by aqueous dispersion liquid to form microspheres, then the microspheres are dispersed into the ABS resin so as to improve the compatibility between the powder with a special effect and the ABS resin, thus the flow marks on the surface during the extrusion or injection moulding process can be eliminated, and the weld lines can be reduced. The prepared spraying-free ABS composition has a prominent metal texture and special aesthetic effects such as pearl-liked sparkling, and the application range of spraying-free materials is greatly enlarged.

The invention discloses a polypropylene composite for a fender as well as a preparation method of the polypropylene composite. The polypropylene composite is prepared from 42-92wt% of polypropylene, 2-5wt% of an oligomer with few flow marks, 1-5wt% of a polar monomer graft olefin polymer, 0-2wt% of a special nucleating agent for polypropylene, 0-4wt% of a processing aid, 0-2wt% of a light stabilizer and 5-40wt% of talcum powder. The preparation method comprises the following steps: melting, mixing and dispersing the polypropylene, the oligomer with few flow marks, the polar monomer graft olefin polymer, the special nucleating agent for polypropylene, the processing aid and the light stabilizer in a double-screw extruder; feeding the talcum powder into the double-screw extruder from one side by an agravic metering balance; and extruding and granulating, thereby finally obtaining the product, namely the polypropylene composite. The polypropylene composite has the characteristics of high rigidity, high gloss and no flow marks and meets the requirements of large-sized polypropylene parts on appearance, and polypropylene injection molded parts have no flow marks.

The invention discloses a high-brightness non-melted mark steam injection mold and a using method thereof. The high-brightness non-melted mark steam injection mold consists of an upper mold, a lower mold, a pouring system, a cooling water channel and an ejecting mechanism; the upper mold has an inlaying structure and consists of an upper mold inlaying plate, an upper-layer insert and a lower-layer insert, the upper-layer insert and the lower-layer insert are fixed in the upper mold inlaying plate, and the lower-layer insert is provided with a steam channel; the lower mold has an inlaying structure and comprises a lower mold inlaying plate and a lower mold insert, the lower-layer insert of the upper mold and the lower mold insert form a cavity, and the lower mold is internally provided with the cooling water channel; the pouring system is connected with the cavity by the upper mold inlaying plate, the upper-layer insert, the lower-layer insert and the lower mold insert; and the ejecting mechanism consists of an ejector rod, an ejector sleeve and a top plate. In the invention, a heat-insulating plate is arranged for heat insulation so as to deform the upper mold, improve the productquality and prolong the service life of the mold; the inlaying structure is adopted to effectively utilize the materials; and feeding is carried out from the inside of the product so as to have markson the surface after a sprue is removed, and ensure the outer surface quality of the product.

The invention discloses a sharp cooling and sharp heating highlight forming die, belonging to the technical field of injection moulding. The invention comprises a cavity insert and is characterized in that the inside of the cavity insert is provided with a plurality of cooling water channels transversely and a steam line; the steam line contains a main gas inlet pipe, shunts and a main gas outletpipe; the main gas inlet pipe extends in the upper right of the cavity insert and extends to the middle part of the cavity insert; four shunts are connected on the main gas inlet pipe side by side and extend downwards; the tail parts of the four shunts are connected with the main gas outlet pipe; and the main gas outlet pipe is arranged transversely and extends out of the lower left of the cavityinsert. The invention solves the problem of the prior art that the injection moulding equipment can not realize the fast heating and fast cooling of the mould, thus the product has the appearance quality defects such as weld marks and flow marks, and provides the sharp cooling and sharp heating highlight forming die which has simple structure and can realize fast heating and fast cooling and achieve better injection moulding effect.

The invention discloses pearl essence coated polymer microspheres. The microspheres comprise the following components: 5-80wt% of pearl essence / aqueous pearl essence paste, 18-90 wt% of an aqueous polymer dispersion liquid and 0.2-10 wt% of a curing agent. A preparation method includes the steps of: a) slowly adding the pearl essence / aqueous pearl essence paste subjected to surface treatment into the aqueous polymer dispersion liquid at room temperature, stirring while adding the curing agent, and continuing stirring for 30-120 min to obtain a pearl essence coated polymer composite dispersion liquid; and b) conducting spray drying on the composite dispersion liquid, subjecting the pearl essence coated polymer droplets formed by spray to curing crosslinking reaction through the curing agent, so as to obtain the pearl essence coated polymer microspheres. The prepared pearl essence coated polymer microspheres can improve the compatibility between pearl essence and the matrix resin, improve the flow uniformity of pearl essence with a melt in an extrusion or injection molding process and, thereby eliminating flow mark on the surface of the product, and reduce the weld bond. Therefore, the invention can be used in the preparation of free-spraying materials.

The invention relates to a panel with a polished surface, in particular to a flow mark-free processing mold and method for a panel with a polished surface. According to the technical scheme, the flowmark-free processing mold for the panel with the polished surface comprises an upper mold body and a lower mold body which can be combined with the upper mold body. A cavity for forming the panel is formed between the upper mold body and the lower mold body. A feeding port communicating with the cavity is formed in the upper mold body or the lower mold body. A heating channel which is provided with one end serving as an inlet end and the other end serving as an outlet end, isolated from the cavity and used for inputting heating media is formed in the upper mold body. The heating channel is located at the tail end of an insertion hole or a spiral hole formed in the panel after liquid materials enter the cavity via the feeding port. By adoption of the flow mark-free processing mold and method for the panel with the polished surface, surface flow marks are eliminated, the structure is simple, operation is convenient, and the surface aesthetic degree is guaranteed.

A flow mark or residual stress occurring in the vicinity of a gate adversely affects the optical characteristics of a resin prism which is to be formed by injection molding. Thus, the molding conditions for the resin prism are strict, and accordingly the resin prism has poor moldability. In view of this, according to this invention, the resin prism includes two or more optical surfaces (11-13) that are not parallel to each other, a pair of side end faces (14, 15) substantially perpendicular to the optical surfaces (11-13), at least one reference block (17) projecting from either one of the pair of side end faces (14, 15) and having a circumferential end face (16) extending in a projecting direction of the reference block, a positioning portion (19, 20) formed on the circumferential end face (16) of the reference block (17), and a curved surface (18) for smoothly connecting the circumferential end face (16) of the reference block (17) and corresponding one of the pair of side end faces (14, 15), wherein the circumferential end face (16) and the corresponding one of the side end faces (14, 15) form an angle of 90 DEG or more.

The invention relates to a shoe sole, in particular to a shoe sole injection mold and a shoe sole processed by adopting the same. According to the technical scheme, the shoe sole injection mold comprises two half-spliced combined or separated modules, a cavity for allowing the shoe sole to be formed is formed between the two modules, the top of the cavity is provided with a mold cover which can beseparated from or attached to the modules, and heating channels which are arranged in the longitudinal directions of the two modules are correspondingly formed in the two modules; and an exhaust channel injection molding block capable of reciprocating towards the cavity is arranged on the end face, facing the cavity, of the mold cover, the cavity comprises a shoe sole fore foot part, a shoe soleheel part and a shoe sole middle part, wherein a mounting hole positioning column which extends towards the transverse middle part of the cavity is arranged on any side, located at the shoe sole heelpart, of the cavity, and the other end of one end, which is linked relative to the cavity, of the mounting hole positioning column extends to the position corresponding to the exhaust channel injection molding block. By the adoption of the technical scheme, the shoe sole injection mold and the shoe sole processed by adopting the same have the advantages that the processing efficiency is improved,and the processing process is reduced.

The invention discloses a multi-air channel auxiliary plastic mold injection molding process, comprising the following steps: step (1) plastic mold design; step (2) mold precooling stage; step (3) melt injection stage; step (4) multiple Airway gas injection control stage; step (5) partial nitrogen filling stage; step (6) gas injection end stage; step (7) gas withdrawal stage. The invention eliminates the internal stress existing in the injection molded parts, so that the quality of the injection molded parts is high, and the production efficiency and yield of the mold are greatly improved.

The invention discloses a spraying-free PC/PBT alloy material and a preparation method thereof, and relates to the field of high polymer materials. The spraying-free PC/PBT alloy material comprises, by weight, 40 to 60 parts of PC; 10 to 50 parts of PBT; 1-20 parts of PC special effect powder masterbatch; 1-15 parts of a compatilizer; 0.1 to 1 part of an antioxidant; and 0.1 to 1 part of a processing aid; wherein the PC special effect powder masterbatch comprises, by weight, 18 to 90 parts of PC, 5-80 parts of special effect powder or particles and 0.1-1 part of a processing aid. According tothe PC/PBT alloy material, the masterbatch is prepared from the special effect powder or particles through PC and then dispersed into the PC/PBT alloy material, the compatibility of the special effectpowder and matrix resin can be obviously improved, the dispersity of the special effect powder or particles is improved, and therefore flow marks and fisheyes on the surface of a product are eliminated, and weld lines are reduced; in addition, PC and PBT are used as alloy materials, so that the thermal deformation temperature of the material is effectively increased, and the market application range of the spraying-free material is greatly widened.