CN108822314B - Polypropylene cooling master batch, production method thereof and production die orifice for implementing method - Google Patents
Polypropylene cooling master batch, production method thereof and production die orifice for implementing method Download PDFInfo
- Publication number
- CN108822314B CN108822314B CN201810348187.2A CN201810348187A CN108822314B CN 108822314 B CN108822314 B CN 108822314B CN 201810348187 A CN201810348187 A CN 201810348187A CN 108822314 B CN108822314 B CN 108822314B
- Authority
- CN
- China
- Prior art keywords
- hole
- die
- master batch
- extruder
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
- B29B9/065—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion under-water, e.g. underwater pelletizers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A polypropylene cooling master batch, a production method thereof and a production die orifice for implementing the method. Mainly aims to solve the problem that the molecular weight regulator in the cooling master batch gradually volatilizes in the storage process. The method is characterized in that: the polypropylene cooling master batch is characterized in that a plastic coating layer is arranged outside a polypropylene cooling master batch monomer. The preparation method comprises running extruders containing temperature-lowering master batch material and plastic coating material at the same time, allowing the two melts to flow through a production die orifice simultaneously by co-extrusion, covering the coating melt on the surface of the melt of the core of the temperature-lowering master batch, and extruding out a die orifice together. The production die orifice for implementing the method is provided with a core pipe, the outer surface of the core pipe and other components of the die orifice form a coating melt flow channel, a frustum-shaped pore channel in the core pipe is used as a cooling master batch core melt flow channel, and an annular pore formed by the edge of a small opening end of the frustum-shaped pore channel and the edge of a die hole is used as an extrusion channel of the coating melt from the coating melt flow channel.
Description
Technical Field
The invention relates to a novel polypropylene plastic product, a production method thereof and die equipment for producing the plastic product.
Background
The polypropylene cooling master batch is also called polypropylene degradation master batch, and is an additive widely used in plastic processing. Its basic functions are to reduce the molecular weight of polypropylene and increase the flowability of polypropylene melt, thus reducing the processing temperature of polypropylene plastics and reducing the consumption of electric energy in the plastic processing process. Meanwhile, the polypropylene spinning solution can narrow the molecular weight distribution of polypropylene, and can improve the spinnability of polypropylene when used in the polypropylene spinning process, so that the polypropylene spinning process is faster and more stable. The conventional polypropylene cooling master batch is prepared by taking polypropylene as a main raw material, mixing a molecular weight regulator and other auxiliaries under a certain process condition, extruding and granulating and the like. The various additives and the polypropylene matrix are melt-granulated and then uniformly mixed, essentially homogeneous, sometimes with a small amount of unintentionally produced microscopic voids. However, the existing polypropylene cooling master batch has the following problems: because the molecules of the molecular weight regulator playing a key role in the cooling master batch are far smaller than those of polypropylene, the molecular weight regulator gradually migrates to the surface of the cooling master batch in the storage process and is volatilized and lost, so that the efficiency of the cooling master batch is reduced. Therefore, the efficiency of the cooling master batches in different production batches and different storage times is different, which causes instability of the plastic processing process and influences the product quality of the polypropylene plastic products produced by adding the cooling master batches.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the invention provides a cooling master batch with a coating structure, which is used for improving the performance stability of the cooling master batch. Meanwhile, a production method for producing the cooling master batch by applying a coextrusion technology and a production die orifice device thereof are provided.
The technical scheme of the invention is as follows: this kind of polypropylene cooling master batch, including polypropylene cooling master batch monomer, its unique character lies in: the polypropylene cooling master batch monomer is externally provided with a plastic coating layer, the plastic coating layer is tightly wrapped on the outer wall of the polypropylene cooling master batch monomer, and the material of the plastic coating layer is thermoplastic plastic with the melting point lower than 240 ℃.
The method for producing the polypropylene cooling master batch comprises the following steps:
firstly, preparing raw materials of a plastic coating layer, namely adding 0-1 wt% of plastic antioxidant, 0-1 wt% of plastic nucleating agent and 0-5 wt% of plastic processing aid into thermoplastic powder for premixing, wherein the rest components are thermoplastic powder; loading into a second extruder after the preparation;
secondly, preparing a core premixed raw material of the polypropylene cooling master batch, and filling the core premixed raw material into a first extruder;
thirdly, connecting a production die orifice specially used for producing the polypropylene cooling master batch to a first extruder host machine used for conveying the core premixed raw material prepared in the second step and a second extruder used for conveying the plastic coating layer raw material prepared in the first step through conveying pipelines respectively; wherein, the cooling master batch melt flow channel of the production die orifice is communicated with the output port of the first extruder through a pipeline, and the coating melt flow channel of the production die orifice is communicated with the output port of the second extruder through a pipeline;
fourthly, the main machine of the first extruder and the main machine of the second extruder run simultaneously, two melts in the first extruder and the second extruder flow through a production die orifice by adopting a coextrusion method, so that the coating melt covers the surface of the melt of the core part of the cooling master batch, and a die hole is extruded together;
and fifthly, cutting and granulating the material extruded in the fourth step to form the polypropylene cooling master batch.
In order to implement the method, the invention provides a specific scheme for producing the die: the production die is provided with a conventional production die base body, and is characterized in that: a coating melt runner is arranged in the die opening matrix; a first through hole and a second through hole are respectively formed in the upper part and the lower part of the coating melt runner, and the axial section of the first through hole is frustum-shaped; the first through hole and the second through hole are provided with coincident central axes, and two circles with different diameters are respectively formed after the first through hole and the second through hole are penetrated with the coating melt runner; an internal thread is formed in the second through hole; the small-diameter end of the first through hole is a die hole for producing materials;
the production die opening also comprises a core tube; the core pipe is formed by connecting a hollow frustum section and a hollow straight pipe section, a frustum-shaped pore passage is formed in the core pipe, and the frustum-shaped pore passage is a cooling master batch melt flow passage; the upper end and the lower end of the core pipe are respectively positioned in the first through hole and the second through hole; the outer wall of the hollow straight pipe section is provided with external threads for being connected with internal threads in the second through hole, and the taper angle of the hollow frustum section is smaller than that of the first through hole, so that a small opening end of a frustum-shaped pore passage in the core pipe and the edge of the die hole can form an annular pore as an extrusion channel of the coating melt from the coating melt runner.
The invention has the following beneficial effects: firstly, the patent adopts a coextrusion method to coat a plastic thin layer on most surfaces of the conventional cooling master batch to form the polypropylene cooling master batch with a coating structure. Due to the blocking effect of the coating on the molecular weight regulator in the cooling master batch, the molecular weight regulator is prevented from diffusing to the surface of the cooling master batch, so that the loss speed of the molecular weight regulator is reduced, the efficiency retention time of the cooling master batch is prolonged, and the quality of the cooling master batch is stabilized. At present, experimental application proves that the stability of the cooling master batch is greatly improved after the invention is applied. Generally, the larger the coating area is, the longer the quality stabilization time of the cooling master batch is. According to the different shapes of this patent cooling master batch, the coating area of the capsule that forms can reach 60% ~99% on cooling master batch surface, generally can reach more than 80%. Secondly, the production die provided by the invention has the advantages of simple structure, few components, convenient processing and manufacturing, convenient disassembly and cleaning and easy maintenance.
Description of the drawings:
fig. 1 is a schematic structural diagram of a polypropylene cooling masterbatch in the prior art.
FIG. 2 is a schematic structural diagram of a polypropylene cooling masterbatch with a coating structure according to the present invention.
FIG. 3 is a schematic side plan view of the core tube.
Fig. 4 is a side bottom external view of the core tube.
FIG. 5 is a schematic side top view of an annular gap adjusting screw.
Fig. 6 is a schematic side bottom view of the annular gap adjusting screw.
Fig. 7 is a schematic view of a conventional die structure.
Fig. 8 is a schematic view of a die structure according to the present invention.
FIG. 9 is a schematic view of a die orifice structure with a gap adjusting screw according to the present invention.
Fig. 10 is a schematic view of the appearance of the cold-cutting die bottom plate side.
FIG. 11 is a schematic view of the appearance of the cold-cut die bottom plate side back face.
FIG. 12 is a schematic view of the front view of the cold-cut pellet die cover plate side.
FIG. 13 is a schematic view of the appearance of the side of the back of the cold-cut pellet die plate.
FIG. 14 is a schematic view of a cold-pelletization die assembly.
FIG. 15 is a schematic view of the cold-cut die after assembly is complete.
FIG. 16 is a cross-sectional view of the cold-cut die after assembly.
FIG. 17 is a schematic front view of the side of the improved cold-cut die cover plate.
FIG. 18 is a schematic view of the side back of the improved cold-cut die plate.
FIG. 19 is a schematic view of a modified cold-chip die assembly.
Fig. 20 is a schematic view of the improved cold-chip die after assembly is complete.
Fig. 21 is a cross-sectional view of the improved cold-chip die after assembly.
Fig. 22 is a schematic external view of the hot pellet die bottom plate side.
Fig. 23 is a schematic view of the appearance of the hot pellet die bottom plate side back face.
FIG. 24 is a schematic front view of a hot-cut die flap panel side.
FIG. 25 is a schematic view of the appearance of the backside of the hot cut die flap side.
Fig. 26 is a schematic view of a hot pellet die assembly.
Fig. 27 is a side elevation view of the hot pellet die after assembly.
Fig. 28 is a side view of the backside of the hot pellet die after assembly.
Fig. 29 is a radial cross-sectional view of the hot pellet die after assembly.
Fig. 30 is an axial cross-sectional view of the hot pellet die after assembly.
In the figure, 1-die hole, 2-core tube, 3-coating melt flow channel, 4-cooling master batch melt flow channel, 5-annular gap adjusting screw, 6-cold cutting die bottom plate, 7-cold cutting die cover plate, 8-bolt, 9-cutting chamber, 10-gasket, 11-heat insulation cover plate, 12-heat insulation pad, 13-heating rod, 14-temperature sensor, 15-hot cutting die cover plate, 16-hot cutting die bottom plate, 17-torpedo head, 18-improved cold cutting die cover plate, 19-die hole of conventional die, 20-cooling master batch melt flow channel of conventional die, 21-polypropylene cooling master batch monomer, 22-plastic coating, 23-die base body, 24-second through hole, 25-first through hole, 26-core tube insertion hole, 27-upper through hole, 28-small bolt, 29-screw
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
the basic unit of the cooling master batch is generally cylindrical-like particles with the diameter of about 0.5-5 mm and the length of about 0.5-10 mm. The cooling masterbatch may refer to the above-mentioned basic unit or an aggregate of the above-mentioned basic units. The 'cooling master batch' mentioned when describing the structure of the cooling master batch in the patent refers to the basic unit of the cooling master batch.
The conventional cooling master batch has a homogeneous structure, as shown in fig. 1. The polypropylene cooling master batch is produced by a conventional production die orifice shown in figure 7, the conventional production die orifice is the same as a common plastic particle granulation die orifice, is of a simple melt extrusion orifice structure, and can be connected with an extruder filled with prepared polypropylene cooling master batch premixing raw materials to extrude the polypropylene cooling master batch of a conventional homogeneous structure. The novel polypropylene cooling master batch provided by the invention comprises a polypropylene cooling master batch monomer 21, namely a core part of the polypropylene cooling master batch, as shown in figure 2, and is characterized in that: the polypropylene cooling master batch monomer is externally provided with a plastic coating layer 22, the plastic coating layer is tightly wrapped on the outer wall of the polypropylene cooling master batch monomer, and the material of the plastic coating layer is thermoplastic plastic with the melting point lower than 240 ℃.
The master batch shown in fig. 2 is a schematic view of the external shape thereof, and the master batch may be shaped into various modified shapes similar to a cylinder, a sphere, and a cube. The diameter range can be between 0.1 mm and 10mm, the length range can be between 0.1 mm and 20mm, and the thickness range of the coating layer can be between 0.001 mm and 2 mm. The thermoplastic material used as the coating layer may be any one of polypropylene, polyethylene wax, polystyrene, polyester resin, polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, POE, EVA, and PVA, or may be a mixture of a plurality of materials.
In addition, in order to improve the ageing resistance, the blocking resistance and the processing performance of the coating layer, the thermoplastic plastics adopted by the plastic coating layer comprise 0-1% of plastic antioxidant, 0-1% of plastic nucleating agent and 0-5% of plastic processing aid by weight, and the rest of the components are thermoplastic plastics.
Wherein the plastic antioxidant can be specifically as follows: pentaerythrityl tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ]; tris (2, 4-di-tert-butylphenyl) phosphite; n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate; 1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) -1,3, 5-triazine-2, 4,6(1H,3H,5H) -trione; n, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine; at least one of 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene.
The plastic nucleating agent can be at least one of calcium carbonate, mica, talcum powder, sodium benzoate, aluminum benzoate, pimelic acid, calcium stearate, oxalic acid, aryl phosphate, nucleating agent NGS-1000, nucleating agent NGS-2000, nucleating agent 3940, nucleating agent 3988, nucleating agent NA10, nucleating agent NA11, nucleating agent NA21, nucleating agent HPN68 and nucleating agent NX 8000.
The plastic processing aid can be at least one of paraffin, stearic acid, oleic acid, oleamide, erucamide and polyvinylidene fluoride.
The method for producing the polypropylene cooling masterbatch of the invention is given below, and comprises the following steps:
firstly, preparing raw materials of a plastic coating layer, namely adding 0-1 wt% of plastic antioxidant, 0-1 wt% of plastic nucleating agent and 0-5 wt% of plastic processing aid into thermoplastic powder for premixing, wherein the rest components are thermoplastic powder; loading into a second extruder after the preparation; the second extruder is a twin-screw or single-screw plastic extruder.
Secondly, preparing a core premixed raw material of the polypropylene cooling master batch, and filling the core premixed raw material into a first extruder; the first extruder is a twin-screw or single-screw plastic extruder.
Thirdly, connecting a production die orifice specially used for producing the polypropylene cooling master batch to a first extruder host machine used for conveying the core premixed raw material prepared in the second step and a second extruder used for conveying the plastic coating layer raw material prepared in the first step through conveying pipelines respectively; wherein, the cooling master batch melt flow channel of the production die orifice is communicated with the output port of the first extruder through a pipeline, and the coating melt flow channel of the production die orifice is communicated with the output port of the second extruder through a pipeline;
fourthly, the main machine of the first extruder and the main machine of the second extruder run simultaneously, two melts in the first extruder and the second extruder flow through a production die orifice by adopting a coextrusion method, so that the coating melt covers the surface of the melt of the core part of the cooling master batch, and a die hole is extruded together;
and fifthly, cutting and granulating the material extruded in the fourth step to form the polypropylene cooling master batch.
The following is a block diagram of a production die for carrying out the aforementioned method. As shown in fig. 3, 4 and 8, this production die has a die base 23, which is unique in that: a coating melt runner 3 is arranged in the die opening base body; a first through hole 25 and a second through hole 24 are respectively formed above and below the coating melt runner, and the axial section of the first through hole 25 is frustum-shaped; the first through hole 25 and the second through hole 24 have coincident central axes, and the first through hole 25 and the second through hole 24 respectively form two circles with different diameters after penetrating with the coating melt runner 3; an internal thread is arranged in the second through hole 24; the small diameter end of the first through hole 25 is a die hole 1 for producing materials.
The production die opening also comprises a core tube 2; the core pipe 2 is formed by connecting a hollow frustum section and a hollow straight pipe section, a frustum-shaped pore passage is formed in the core pipe 2, and the frustum-shaped pore passage is a cooling master batch melt flow passage 4; the upper end and the lower end of the core tube are respectively positioned in the first through hole 25 and the second through hole 24; wherein, the outer wall of the hollow straight pipe section is provided with an external thread for connecting with an internal thread in the second through hole 24, and the taper angle of the hollow frustum section is smaller than that of the first through hole 25, so that the small end of the frustum-shaped hole in the core pipe 2 and the edge of the die hole 1 can form an annular pore as an extrusion channel of the coating melt from the coating melt runner 3.
When the die orifice is adopted, the external thread at the large-opening end of the core pipe 2 is used for fixing, and the external thread also has a certain adjusting function on the annular hole.
Fig. 9 shows another modified production die which can be used to carry out the method described above, also having a die base 23, which is unique in that:
a coating melt runner 3 is arranged in the die opening base body; an upper through hole 27 and a second through hole 24 are respectively arranged at the upper part and the lower part of the coating melt runner 3; the upper through hole 27 and the second through hole 24 have coincident central axes, and the upper through hole 27 and the second through hole 24 respectively form two circles with different diameters after penetrating with the coating melt runner 3; internal threads are formed in the upper through hole 27 and the second through hole 24;
the production die also comprises an annular gap adjusting screw 5. Fig. 5 and fig. 6 are two different angle views of the annular gap adjusting screw 5, the outer wall of the annular gap adjusting screw 5 is provided with an external thread for threaded connection with the upper through hole 27, the inside of the annular gap adjusting screw is provided with a core tube inserting hole 26 with a frustum-shaped axial cross section, and the small-diameter end of the core tube inserting hole 26 is a die hole 1 for producing materials;
the production die opening also comprises a core tube 2; the core pipe 2 is formed by connecting a hollow frustum section and a hollow straight pipe section, a frustum-shaped pore passage is formed in the core pipe 2, and the frustum-shaped pore passage is a cooling master batch melt flow passage 4; the upper and lower ends of the core tube 2 are respectively positioned in the core tube insertion hole 26 and the second through hole 24; the outer wall of the hollow straight pipe section is provided with external threads for being connected with internal threads in the second through hole 24, and the taper angle of the hollow frustum section is smaller than that of the core pipe inserting hole 26, so that an annular pore can be formed between the small end of the frustum-shaped hole in the core pipe and the edge of the die hole 1 to serve as an extrusion channel of the coating melt from the coating melt runner 3.
When adopting this kind of die orifice, through the screw in degree of depth of adjustment annular space adjusting screw 5, make the gap size of the annular hole who extrudes the passageway as the coating fuse-element change, can adjust performances such as thickness, the degree of consistency of this patent cooling master batch coating.
Several examples of the use of this production die for making cold and hot pellet dies are given below:
example 1: and manufacturing a cold grain cutting die orifice. As shown in fig. 10 to 16, the cold pellet cutting die comprises a cold pellet cutting die bottom plate 6, a cold pellet cutting die cover plate 7 and a core tube 2, wherein a row of holes with internal threads are arranged on the cold pellet cutting die bottom plate 6 side by side according to the yield requirement and used for installing the core tube 2. A through frustum-shaped pore channel is formed in the position, corresponding to and coaxial with the threaded hole in the cold cutting die orifice bottom plate 6, of the cold cutting die orifice cover plate 7, a small-port end, back to the cold cutting die orifice bottom plate 6, of the die orifice 1, and the diameter of the die orifice 1 is determined according to the yield and the product requirements. The side surface of the cold cutting die cover plate 7 is provided with a pore passage which penetrates through all the frustum-shaped pore passages and is used as a flow passage 3 of coating melt. The cold granulating die orifice bottom plate 6 is provided with a positioning groove, so that the corresponding pore passages between the cold granulating die orifice bottom plate 6 and the cold granulating die orifice cover plate 7 are coaxial.
When assembling the cold pellet die, as shown in fig. 14, 15, and 16, the core tube 2 is fixed to the cold pellet die bottom plate 6 by screw connection, and the cold pellet die cover plate 7 and the cold pellet die bottom plate 6 are fastened and fixed to the discharge end of the extruder by bolts.
Example 2: the cold grain cutting die orifice is manufactured by adopting a production die orifice structure with an adjusting annular gap adjusting screw. As shown in fig. 17 to 21, the cold pelletizing die consists of a cold pelletizing die bottom plate 6, a modified cold pelletizing die cover plate 18, a core pipe 2 and an annular space adjusting screw 5. A row of holes with internal threads are arranged on the bottom plate 6 of the cold cutting die opening side by side according to the yield requirement and are used for installing the core pipe 2. The improved cold grain cutting die opening cover plate 18 is provided with a through hole at the position which is coaxial with the threaded hole on the cold grain cutting die opening bottom plate, and one end of the through hole, which is far away from the cold grain cutting die opening bottom plate 6, is provided with internal threads and is used for installing an annular gap adjusting screw 5. The side surface of the improved cold cutting die cover plate 18 is provided with a pore passage which penetrates all the through hole pore passages and is used as a flow passage 3 of coating melt. The cold grain cutting die orifice bottom plate 6 is provided with a positioning groove, so that the corresponding pore channels between the cold grain cutting die orifice bottom plate 6 and the improved cold grain cutting die orifice cover plate 18 are coaxial.
The assembly of the improved cold cutting die is shown in fig. 19, 20 and 21, the annular gap adjusting screw 5 is fixed on the cover plate 18 of the improved cold cutting die through threaded connection, the core tube 2 is fixed on the bottom plate 6 of the cold cutting die through threaded connection, and the cover plate 18 of the improved cold cutting die and the bottom plate 6 of the cold cutting die are fastened and fixed on the discharge end of the extruder through bolts.
Example 3: and manufacturing a hot pelletizing die orifice. The hot pellet die assembly is shown in fig. 26, and the main components are a hot pellet die bottom plate 16, a hot pellet die cover plate 15, a core tube 2, a pellet chamber 9, a gasket 10, a heat insulation cover plate 11, a heat insulation pad 12, a heating rod 13, a temperature sensor 14, a torpedo head 17 and the like. As shown in fig. 22 and 23, a ring of internally threaded holes is circumferentially opened in the hot pellet die bottom plate 16 for installing the core tube 2 as required for the production. As shown in fig. 24 and 25, a through frustum-shaped hole is formed in the hot pelletizing die cover plate 15 at a position coaxial with the threaded hole in the hot pelletizing die base plate 16, a small opening end of the frustum-shaped hole, which faces away from the hot pelletizing die base plate 16, is a die hole 1, and the diameter of the die hole 1 is determined according to the yield and the product requirement. An annular groove is formed in one side, facing the hot pellet cutting bottom plate 16, of the hot pellet cutting die orifice cover plate 15, and the annular groove is radially connected with a frustum-shaped pore passage of the die hole 1 through a radial groove. One of the radial grooves is selected to extend to the circumferential side of the cover plate 15 of the hot-cutting die, and a through hole for coating melt to flow into is formed. The frustum-shaped pore channel, the annular groove and the radial groove on the hot granulating die orifice cover plate 15 and the through hole extending to the circumferential side surface of the hot granulating die orifice cover plate 15 are jointly used as a channel 3 of the coating melt. The circumferential side surface of the hot pelletizing die cover plate 15 is also provided with a plurality of mounting holes for the heating rod 13 and the temperature sensor 14. The hot pelletizing die orifice bottom plate 16 is provided with a positioning groove to ensure that corresponding pore passages between the hot pelletizing die orifice bottom plate 16 and the hot pelletizing die orifice cover plate 15 are coaxial.
Assembly of the hot pellet die as shown in fig. 26 to 30, the core tube 2 is fixed to the hot pellet die base plate 16 by screw-fastening. The torpedo head 17, the hot pellet die orifice bottom plate 16 and the hot pellet die orifice cover plate 15 are stacked in sequence and fastened together through a group of small bolts 28. The thermal insulating mat 12 and the thermal insulating cover plate 11 are stacked in this order on the center of the front surface of the hot pellet die cover plate 15, and they are fixed to the hot pellet die cover plate 15 by a set of screws 29. Gasket 10 is placed between hot pellet die cover 15 and pellet chamber 9 and is fastened by a set of bolts 8 and secures the entire hot pellet die to the discharge end of the extruder. The heating rod 13 and the temperature sensor 14 are respectively inserted into corresponding mounting holes on the circumferential side surface of the hot pelletizing die cover plate 15.
The following provides an example of preparing polypropylene cooling masterbatch by applying the present invention.
Example 4: and (3) mounting the cold cutting die orifice with the diameter of the die orifice of 3.5mm on a machine head of a plastic extruder host, and connecting the machine head of the coating extruder with a side hole of the cold cutting die orifice.
The temperature of the plastic extruder host machine is 145 ℃, the temperature of the coating extruder and the temperature of the die orifice are set to be 180 ℃. And after the temperature is stable, starting the main machine of the plastic extruder and the coating extruder. Adding conventional cooling master batch into a plastic extruder, and adding a premix of 100 parts of polypropylene and 0.2 part of sodium benzoate into a coating extruder as a coating raw material. Controlling the extrusion speed to ensure that the extrusion capacity ratio of the conventional cooling master batch to the coating raw material is 10/1, and cooling and dicing the material strips extruded from the die orifice to obtain the cooling master batch with the coating structure. The drawing speed of the pelletizer and the pelletizing speed ratio were adjusted to obtain pellets having a diameter of about 2mm, a length of about 4mm, a coating thickness of about 0.05mm and a coating coverage of about 80%.
Example 5: and (3) mounting the cold cutting die orifice with the diameter of the die orifice of 3.5mm on a machine head of a plastic extruder host, and connecting the machine head of the coating extruder with a side hole of the cold cutting die orifice.
The temperature of the main machine of the plastic extruder, the temperature of the coating extruder and the temperature of the die orifice are respectively set to 145 ℃. And after the temperature is stable, starting the main machine of the plastic extruder and the coating extruder. Adding conventional cooling master batch into a plastic extruder, and adding polyethylene into a coating extruder as a coating raw material. Controlling the extrusion speed to ensure that the extrusion capacity ratio of the conventional cooling master batch to the coating raw material is 50/1, and cooling and dicing the material strips extruded from the die orifice to obtain the cooling master batch with the coating structure. The drawing speed of the pelletizer and the pelletizing speed ratio were adjusted to obtain pellets having a diameter of about 2mm, a length of about 5mm, a coating thickness of about 0.01mm and a coating coverage of about 83.3%.
Example 6: and (3) mounting a cold cutting die orifice with the diameter of a die hole of 4.0mm and adopting an annular gap adjusting screw on a machine head of a plastic extruder host, and connecting the machine head of the coating extruder with a side hole of the cold cutting die orifice.
The temperature of the plastic extruder host machine is 145 ℃, the temperature of the coating extruder and the temperature of the die are respectively set to be 135 ℃. And after the temperature is stable, starting the coating extruder, adding polyethylene wax, and adjusting the annular gap adjusting screws to ensure that the polyethylene wax can be uniformly extruded in each annular gap. Starting a main machine of the plastic extruder, and adding the conventional cooling master batch. Controlling the extrusion speed to ensure that the extrusion capacity ratio of the conventional cooling master batch to the coating raw material is 50/1, and cooling and dicing the material strips extruded from the die orifice to obtain the cooling master batch with the coating structure. The drawing speed of the pelletizer and the pellet speed ratio were adjusted to obtain pellets having a diameter of about 2.5mm, a length of about 7mm, a thickness of about 0.013mm and a coating coverage of about 84.9%.
Example 7: and (3) mounting a hot pelletizing die orifice with the diameter of 2.5mm on a start valve connected with a machine head of a plastic extruder main machine, and connecting the machine head of the coating extruder with a coating melt runner on the hot pelletizing die orifice. The conventional underwater grain-cutting hot grain-cutting facilities such as a grain-cutting knife, a start valve, a centrifuge, circulating water, a grain-cutting water chamber and the like are installed according to a known conventional method.
The temperature of the main machine of the plastic extruder and the temperature of the coating extruder are respectively set to be 145 ℃ and the temperature of the die orifice is set to be 155 ℃. After the temperature is stable, the main machine of the plastic extruder and the coating extruder are started, and the centrifugal machine, the circulating water, the grain cutting knife and other facilities are started according to the known underwater granulation starting program. Adding conventional cooling master batch into a plastic extruder, and adding polyethylene into a coating extruder. The extrusion speed is controlled, so that the extrusion quantity ratio of the conventional cooling master batch to the coating raw material is 50/1. The rotation speed of the cutter was adjusted to obtain particles having a diameter of about 2.8mm, a length of about 2.8mm, a coating thickness of about 0.014mm and a coating coverage of about 66.7%.
Comparative example A die hole was mounted on the head of a plastic extruder through a 3.5mm conventional cold pellet die.
The temperature of the main machine of the plastic extruder and the temperature of the die orifice are respectively set to 145 ℃. And after the temperature is stable, starting a main machine of the plastic extruder, adding the conventional cooling master batch into the plastic extruder, cooling the material strips extruded from the die orifice, and pelletizing to obtain the conventional cooling master batch. The rotation speed of the cutter was adjusted to obtain particles having a diameter of about 2mm and a length of about 4 mm.
Placing the temperature-reducing master batch samples prepared in the above examples in a constant temperature environment of 30 ℃, weighing the sample weight every 10 days, and calculating the weight loss rate, wherein the calculation formula is as follows:
weight loss rate = (initial weight of sample-weight of sample) × 100%/initial weight of sample
The results are shown in Table 1.
TABLE 1 weight loss Rate cases
| Number of | Day | 0 | |
|
Day 30 | Day 40 | Day 50 | Day 60 | Day 70 |
| Example 4 | 0% | 0.21% | 0.33% | 0.36% | 0.39% | 0.40% | 0.41% | 0.42% | |
| Example 5 | 0% | 0.19% | 0.29% | 0.33% | 0.35% | 0.37% | 0.37% | 0.38% | |
| Example 6 | 0% | 0.18% | 0.29% | 0.34% | 0.35% | 0.36% | 0.37% | 0.37% | |
| Example 7 | 0% | 0.39% | 0.64% | 0.73% | 0.77% | 0.81% | 0.81% | 0.83% | |
| Comparative example | 0% | 0.89% | 1.49% | 1.69% | 1.79% | 1.84% | 1.86% | 1.89% |
Claims (3)
1. A method for producing polypropylene cooling masterbatch, wherein a plastic coating layer (22) is arranged outside a polypropylene cooling masterbatch monomer, the plastic coating layer is tightly coated on the outer wall of the polypropylene cooling masterbatch monomer, and the plastic coating layer is made of thermoplastic plastics with the melting point lower than 240 ℃, and is characterized by comprising the following steps:
firstly, preparing raw materials of a plastic coating layer, namely adding 0-1 wt% of plastic antioxidant, 0-1 wt% of plastic nucleating agent and 0-5 wt% of plastic processing aid into thermoplastic powder for premixing, wherein the rest components are thermoplastic powder; loading into a second extruder after the preparation;
secondly, preparing a core premixed raw material of the polypropylene cooling master batch, and filling the core premixed raw material into a first extruder;
thirdly, connecting a production die orifice for producing the polypropylene cooling master batch to a first extruder host machine for conveying the core premixed raw material prepared in the second step and a second extruder for conveying the plastic coating layer raw material prepared in the first step through conveying pipelines respectively; wherein, the cooling master batch melt flow channel of the production die orifice is communicated with the output port of the first extruder through a pipeline, and the coating melt flow channel of the production die orifice is communicated with the output port of the second extruder through a pipeline;
fourthly, the main machine of the first extruder and the main machine of the second extruder run simultaneously, two melts in the first extruder and the second extruder flow through a production die orifice by adopting a coextrusion method, so that the coating melt covers the surface of the melt of the core part of the cooling master batch, and a die hole is extruded together;
and fifthly, cutting and granulating the material extruded in the fourth step to form the polypropylene cooling master batch.
2. A production die for carrying out the method as claimed in claim 1, having a die base body (23), characterized in that: a coating melt runner (3) is arranged in the die opening matrix; a first through hole (25) and a second through hole (24) are respectively formed above and below the coating melt runner, and the axial section of the first through hole (25) is frustum-shaped; the first through hole (25) and the second through hole (24) are provided with coincident central axes, and the first through hole (25) and the second through hole (24) are penetrated with the coating melt runner to respectively form two circles with different diameters; the second through hole (24) is internally provided with internal threads; the small-diameter end of the first through hole (25) is a die hole (1) for producing materials;
the production die also comprises a core tube (2); the core pipe (2) is formed by connecting a hollow frustum section and a hollow straight pipe section, a frustum-shaped pore passage is formed in the core pipe (2), and the frustum-shaped pore passage is a cooling master batch melt flow passage (4); the upper end and the lower end of the core tube (2) are respectively positioned in the first through hole (25) and the second through hole (24); the outer wall of the hollow straight pipe section is provided with external threads for being connected with internal threads in the second through hole (24), and the taper angle of the hollow frustum section is smaller than that of the first through hole (25), so that the small opening end of a frustum-shaped pore passage in the core pipe (2) and the edge of the die hole (1) can form an annular pore as an extrusion channel of the coating melt from the coating melt runner (3).
3. A production die for carrying out the method as claimed in claim 1, having a die base body (23), characterized in that:
a coating melt runner (3) is arranged in the die opening matrix; an upper through hole (27) and a second through hole (24) are respectively formed above and below the coating melt runner; the upper through hole (27) and the second through hole (24) are provided with coincident central axes, and two circles with different diameters are respectively formed after the upper through hole (27) and the second through hole (24) are penetrated with the coating melt runner; internal threads are arranged in the upper through hole (27) and the second through hole (24);
the production die opening further comprises an annular clearance adjusting screw (5), the outer wall of the annular clearance adjusting screw (5) is provided with an external thread for being in threaded connection with the upper through hole (27), the inner part of the annular clearance adjusting screw (5) is provided with a core pipe insertion hole (26) with a frustum-shaped axial section, and the small-diameter end of the core pipe insertion hole (26) is a die hole (1) for producing materials;
the production die also comprises a core tube (2); the core pipe (2) is formed by connecting a hollow frustum section and a hollow straight pipe section, a frustum-shaped pore passage is formed in the core pipe (2), and the frustum-shaped pore passage is a cooling master batch melt flow passage (4); the upper end and the lower end of the core pipe (2) are respectively positioned in the core pipe inserting pore canal (26) and the second through hole (24); the outer wall of the hollow straight pipe section is provided with external threads for being connected with internal threads in the second through hole (24), and the taper angle of the hollow frustum section is smaller than that of the core pipe insertion hole (26), so that the small opening end of the frustum-shaped hole in the core pipe (2) and the edge of the die hole (1) can form an annular pore as an extrusion channel of the coating melt from the coating melt flow channel (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810348187.2A CN108822314B (en) | 2018-04-18 | 2018-04-18 | Polypropylene cooling master batch, production method thereof and production die orifice for implementing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810348187.2A CN108822314B (en) | 2018-04-18 | 2018-04-18 | Polypropylene cooling master batch, production method thereof and production die orifice for implementing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108822314A CN108822314A (en) | 2018-11-16 |
| CN108822314B true CN108822314B (en) | 2020-12-04 |
Family
ID=64155420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810348187.2A Active CN108822314B (en) | 2018-04-18 | 2018-04-18 | Polypropylene cooling master batch, production method thereof and production die orifice for implementing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108822314B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210143844A (en) * | 2019-03-29 | 2021-11-29 | 다우 글로벌 테크놀로지스 엘엘씨 | Hollow Pellets and Immersion Method |
| CA3133837A1 (en) * | 2019-03-29 | 2020-10-08 | Dow Global Technologies Llc | Pellet containing additives |
| EP3946887A4 (en) * | 2019-03-29 | 2022-11-09 | Dow Global Technologies LLC | Die assembly for producing fluid-filled pellets |
| CN111849073A (en) * | 2020-08-03 | 2020-10-30 | 岳阳隆兴实业公司 | Coating material |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798422B (en) * | 2010-03-19 | 2012-08-15 | 郭学阳 | Production method of polypropylene cooling masterbatch |
| CN102863694A (en) * | 2012-10-18 | 2013-01-09 | 重庆澳彩科鼎塑染色母有限责任公司 | Polypropylene cooling masterbatch and preparation method thereof |
| CN106496788A (en) * | 2016-10-27 | 2017-03-15 | 大连聚兴科技有限公司 | A kind of polypropylene cooling masterbatch and preparation method thereof |
| CN107337801B (en) * | 2017-08-07 | 2020-06-05 | 菏泽学院 | Method for preparing high melt strength polypropylene by electron irradiation crosslinking |
-
2018
- 2018-04-18 CN CN201810348187.2A patent/CN108822314B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108822314A (en) | 2018-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108822314B (en) | Polypropylene cooling master batch, production method thereof and production die orifice for implementing method | |
| CN101531770B (en) | Preparation and application of open-cell foamed polyolefin | |
| CN103102552A (en) | Phase-changed heat insulation polyolefin foam material and preparation method thereof | |
| KR20120036946A (en) | Molding material for extrusion foam molding, process for producing same, woody molded foam produced from the molding material, and process and apparatus for producing the woody molded foam | |
| CN101851378B (en) | Extrusion grade ASA resin with easy processing and high apparent property and preparation method thereof | |
| SE434481B (en) | THERMOPLAST foam foam cooling device | |
| CN107200912A (en) | A kind of foaming master batch of favorable dispersibility and preparation method thereof | |
| CN105860275A (en) | Beta-PPR tube and preparation method thereof | |
| CN101382626A (en) | Optical cable foaming packing gasket granule material and method for producing same | |
| CN103182818A (en) | Polycarbonate extrusion foaming composite sheet material and preparation method thereof | |
| CN101774267B (en) | Extrusion neck ring mold and method for preparing materials with high orientation degree distribution of filling materials | |
| US20150149125A1 (en) | Perforated plate for producing granules from thermoplastic material and for producing such a perforated plate | |
| CN108327118B (en) | Hot dicing die for producing polypropylene cooling master batch | |
| CN108687994B (en) | Cold granulating die for producing polypropylene cooling master batch | |
| CN208484065U (en) | For producing the cold palletizing die orifice of polypropylene cooling masterbatch | |
| KR100318587B1 (en) | Method and apparatus of preparing an artificial wood with a multi-layered construction via an extrusion process | |
| CN105085987B (en) | The preparation method of covering property granule | |
| CN111853377B (en) | PE water supply pipe and preparation method thereof | |
| CN110951168A (en) | Modified polypropylene composite material for automobile bumper and preparation method thereof | |
| CN213107816U (en) | Die head structure of multilayer die for processing composite micro-foaming material | |
| CN104817798B (en) | A kind of foaming plate preparation method, foaming plate and automobile | |
| CN114369307B (en) | Preparation method of hollow board packaging material with surface layer having ink adsorption function | |
| CN114957948B (en) | Foaming wire for 3D printing and preparation method and application thereof | |
| CN113773548A (en) | PS baseboard CO2Physical foaming process | |
| CN111716584A (en) | Large-size PFA forming process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210524 Address after: 151400 Dongqing village committee 12a-13, wolitun Township, Anda City, Suihua City, Heilongjiang Province Patentee after: Heilongjiang Taibo Chemical Co.,Ltd. Address before: 163311 business 518, B21 business service building, south 2nd Road, Chengfengzhuang, Ranghulu District, Daqing City, Heilongjiang Province Patentee before: DAQING HAIYUEDA TECHNOLOGY Co.,Ltd. |