Multi-point coating multifunctional composite polymer material enhanced production process and system

Abstract

The present invention relates to a multi-point coating type multifunctional composite polymer material reinforcement production process and system, wherein PP resin is sent from a PP resin raw material station to a discharge bin of a feeding station; volatile organic compounds are removed from the PP resin in the discharge bin of the feeding station and then sent to a cooling bin; the cooled PP resin is sent to a PP resin storage bin for standby use; PP resin 1, PP resin 2, CMB masterbatch, CA coupling agent and uniformly mixed ADD additive raw materials are sent from the feeding station to a buffer bin; the raw materials in the PP resin storage bin and the buffer bin are weighed through a feeding system and then sent to an extruder feed port; the glass fiber is controlled to be pulled out from the glass fiber station and then enter the extruder die head; the glass fiber is controlled to be moved out from the glass fiber station and then enter the extruder die head and mixed with the molten PP resin so that the surface of the glass fiber is coated with the PP resin; the glass fiber combined with the PP resin is controlled to be extruded from the extruder die head. The present invention ensures the uniformity of the resin coating layer on the surface of the long glass fiber, so that the product has higher strength and impact resistance.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a multi-point coating type multifunctional composite polymer material enhanced production process and system. Background Art

[0002] Long glass fiber reinforced thermoplastic (LGFRT) is a composite material with light weight and high strength. It has better mechanical properties and temperature resistance than short glass fiber reinforced thermoplastic (SGFRT), and can better play the role of glass fiber reinforcement. This composite material is mainly used in occasions with higher requirements than SGFRT. It is now widely used in the automotive industry, machinery manufacturing, electronic appliances, chemical environmental protection, aerospace communications, construction and other departments and industries, aerospace equipment shells, connectors, etc., with the characteristics of high temperature resistance, high strength and light weight. It is particularly widely used in automotive parts, and the products are generally bumpers, fenders, engine hoods, instrument panels, doors, seat backs, heater impellers, etc. In the field of electronics, electrical and information technology, LGFRT is used to manufacture instrument covers, junction boxes, TV back covers, fan blades, etc. In the field of chemical corrosion protection, LGFRT is used as storage tanks, pipelines, inner pipes, etc. At present, there are many studies and applications on SGFRT in China, but there are few studies on LGFRT. From the perspective of application, LGFRT has a broader development prospect.

[0003] Since the melt viscosity of thermoplastic resins generally exceeds 100 Pa·s, it is difficult to obtain good impregnation of glass fibers. Therefore, the key to the preparation of LGFRT lies in solving the problem of how to obtain good impregnation of long glass fibers. A lot of research has been carried out at home and abroad. The main impregnation processes currently developed include melt impregnation, solution impregnation, powder impregnation, suspension impregnation and mixed yarn impregnation.

[0004] However, the existing impregnation method often fails to completely coat the glass fiber surface with PP resin, or the efficiency is too low due to defects in the production process itself, and the long glass fiber has poor wear resistance, which cannot meet the use requirements of some industries. In addition, the impregnation method cannot solve the problem of uneven resin material caused by different melt indexes of the resin material, which leads to unstable product quality. The multi-point coating method adopts P&ID adjustment. At any time point, the output of the fiber and the output of the resin are constant, which fundamentally solves the problem. At the same time, under the same configuration, the production capacity of this process is 4-8 times the production capacity. Thereby reducing labor and energy costs. This process can fill the domestic gap. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the conventional long glass fiber is coated with PP resin on the surface of the long glass fiber by the dipping method, which has low coating efficiency and poor effect, and unstable quality. In view of the above-mentioned defects of the prior art, a multi-point coating multifunctional composite polymer material reinforcement production process and system are provided.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: constructing a multi-point coating type multifunctional composite polymer material reinforcement production process, which includes:

[0007] Send PP resin from the PP resin station to the unloading bin of the feeding station;

[0008] The PP resin in the unloading bin of the feeding station is sent to the cooling bin after removing volatile organic compounds;

[0009] The cooled PP resin is sent to the PP resin storage bin for standby use;

[0010] Send PP resin 1, PP resin 2, CMB masterbatch, CA coupling agent and evenly mixed ADD additive raw materials from the feeding station into the buffer bin;

[0011] The raw materials in the PP resin storage bin and buffer bin are weighed through the feeding system and then fed into the extruder feed port;

[0012] Control the glass fiber to be pulled out from the glass fiber station and enter the extruder die head;

[0013] Control the glass fiber to move out of the glass fiber station and enter the extruder die to mix with the molten PP resin so that the surface of the glass fiber is coated with PP resin;

[0014] The glass fiber combined with PP resin is controlled to be extruded from the die head of the extruder.

[0015] Preferably, after the glass fiber is pulled out from the glass fiber station and before it is coated with the molten PP resin, the process includes:

[0016] After being pulled out from the glass fiber station, the glass fiber is passed through the waxing die head of the waxing machine for waxing so that the surface of the glass fiber is coated with wax liquid;

[0017] The waxed glass fiber is controlled to enter the die head of the extruder and is combined with the molten PP resin before being extruded.

[0018] Preferably, controlling the glass fiber to be drawn out from the glass fiber station and then pass through the waxing die head for waxing so that the surface of the glass fiber is coated with wax liquid comprises:

[0019] The wax raw material is heated into molten wax liquid and then enters the waxing die head of the waxing machine for waxing.

[0020] Preferably, the wax raw material is heated into a molten wax liquid and then enters the waxing die head of a waxing machine for waxing, comprising:

[0021] The wax raw material is transported from the feeding station to the molten wax storage tank and heated into liquid wax;

[0022] After being filtered, the liquid wax is transported to the waxing machine through the liquid wax pipeline;

[0023] During the transportation process, the liquid wax is heated at a constant temperature to prevent it from solidifying.

[0024] Preferably, a pressure sensor is provided on the liquid wax pipeline, and the pressure sensor is used to detect whether the liquid wax pipeline is blocked.

[0025] Preferably, a three-way valve is installed on the liquid wax pipeline. When the glass fiber breakage is detected, the three-way valve is switched to send the wax liquid to the reflux pipeline and enter the molten wax storage barrel.

[0026] Preferably, controlling the glass fiber combined with the PP resin to be extruded from the die head of the extruder comprises:

[0027] The extruded glass fiber is fed into a pelletizer for cutting and packaging.

[0028] Preferably, the extruded glass fiber is controlled to enter a pelletizer for cutting and then packaged and stored, including:

[0029] Control the extruded glass fiber to enter the cooling system for cooling and then enter the pelletizer for pelletizing;

[0030] The speed of the pelletizer controls the feeding amount of the feeder, the screw speed of the extruder and the flow rate of the waxing pump of the waxing machine.

[0031] Preferably, the method of controlling the extruded glass fiber to enter a cooling system for cooling and then enter a pelletizer for pelletizing comprises:

[0032] The pellets coming out of the pelletizer enter the screening system;

[0033] Screening systems include rolling screening and / or linear screening;

[0034] The screened particles enter the post-mixing system for packaging.

[0035] In order to solve the above technical problems, the present application provides a multi-point coating type multifunctional polymer material enhancement production system, which is applied to the above-mentioned multi-point coating type multifunctional polymer material enhancement production process.

[0036] The beneficial effects of the present invention are as follows: PP resin is sent from the feeding station to the drying bin by positive pressure conveying, and then sent to the storage bin after removing the volatile organic compounds on the surface; PP resin 1, PP resin 2, CMB masterbatch, CA coupling agent and evenly mixed ADD additive are sent to the buffer bin by positive pressure conveying; then the raw materials are sent to the extruder for mixing to obtain molten PP resin; the glass fiber coming out of the glass fiber station passes through the waxing die head for waxing so that the surface of the glass fiber is coated with wax liquid, and the glass fiber coated with wax liquid is combined with the molten PP resin at the extruder die head and then extruded to obtain a composite polymer material; by coating wax liquid between the glass fiber and the molten PP resin, the combination of the glass fiber and the molten PP resin is increased, and the wax liquid and the PP resin are heated into liquid to form a coating type coating on the waxing machine die head and the extruder die head with the glass fiber, and the coating effect is better, avoiding that the surface of some glass fibers is not coated with molten wax liquid or PP resin. The glass fiber combined with the PP resin enters the pelletizer for pelletizing and screening, and the qualified pellets are sent to the packaging system for packaging. The molten wax liquid and molten PP resin are coated on the surface of the glass fiber by coating to form a multifunctional composite polymer material. The overall equipment adopts high-speed automated production, which has higher production efficiency. In view of the falling of material strips or the disconnection of glass fibers during the production process, a friction sensor is set to detect the friction of the glass fiber, and the molten wax liquid is sent back to the molten wax storage barrel to avoid the waste of molten wax liquid when the fiber is broken. Therefore, the automated production of long glass fiber reinforced resin and the uniformity of the resin coating layer make the product have higher strength and impact resistance, and ensure the stability of the ratio of glass fiber and resin, with the advantages of high stiffness and impact strength quality. At the same time, the multi-point coating adopts P&ID adjustment. At any time point, the output of glass fiber and PP resin is constant, thereby fundamentally solving the problem. At the same time, under the same configuration, the production capacity of this process is 4-8 times the production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work:

[0038] Figure 1 A schematic diagram of the process flow of a multi-point coating multifunctional polymer material enhancement production process according to a preferred embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the process of delivering PP resin into a storage bin after passing through a positive pressure conveying system and a drying system according to a preferred embodiment of the present invention;

[0040] Figure 3It is a schematic diagram of the process of controlling the glass fiber to be drawn out from the glass fiber station and then passed into the waxing die head of the waxing machine for waxing so that the surface of the glass fiber is coated with a layer of wax liquid in a preferred embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the process of controlling the extruded glass fiber to enter a pelletizer for cutting and then be stored before packaging in a preferred embodiment of the present invention;

[0042] Figure 5 A feeder output capacity table for a preferred embodiment of the present invention;

[0043] Figure 6 This is a table of temperature control functions for each zone of the extruder of a preferred embodiment of the present invention;

[0044] Figure 7 A schematic diagram of the control area and barrel area of ​​an extruder in a preferred embodiment of the present invention;

[0045] Figure 8 This is a system structure diagram of a multi-point coating multifunctional polymer material enhancement production system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0047] like Figure 1 As shown, the multi-point coating multifunctional composite polymer material reinforcement production process of the preferred embodiment of the present invention comprises:

[0048] S1: PP resin is sent to the storage bin after passing through the positive pressure conveying system and drying system;

[0049] Specifically, the PP resin raw material is transported from the PP resin feeding station to the drying silo through a positive pressure conveying system. The PP resin in the drying silo is removed of volatile organic compounds by the drying system, and is kept warm to a certain extent before being discharged into a cooling silo to be cooled and finally transported to a storage silo.

[0050] S2: transport the raw materials to the buffer silo for production and processing;

[0051] Specifically, the raw materials of the multifunctional composite polymer material include PP resin 1, PP resin 2, CMB masterbatch, CA coupling agent, uniformly mixed ADD additive, antioxidant and flame retardant. Among them, PP resin 1 and PP resin 2 are polypropylene resin raw materials that do not need to be dried, and ADD additive, antioxidant and flame retardant have been uniformly mixed.

[0052] Furthermore, in this embodiment, when PP resin 1 and PP resin 2 are put in, PP resin 1 and PP resin 2 pass through the large bag feeding station, and the large bag of raw materials is taken out from the PP resin raw material storage bin manually through the walking hoist, and then put into the PP1 and PP2 feeding bins of the respective feeding stations, and then sent to the respective PP1 and PP2 buffer bins by the negative pressure conveying device. Alternatively, PP resin 1 and PP resin 2 can also use 25Kg packaging raw materials to be placed in the PP resin raw material storage bin, and then manually put into the PP1 and PP2 feeding bins of the respective feeding stations. The feeding bin of the feeding station is equipped with a low material level switch, which issues an alarm prompting feeding when the material level in the PP1 or PP2 feeding bin is low. Alternatively, PP resin 1 and PP resin 2 can also be directly transported from the raw material storage bin to the respective PP1 and PP2 buffer bins by negative pressure conveying.

[0053] Furthermore, when feeding CMB masterbatch materials, the large package of CMB masterbatch materials is manually lifted and taken out from the CMB raw material storage bin by a walking hoist, and manually fed into the silo of the CMB feeding station, and then transported to the CMB buffer bin by a negative pressure conveying device. Alternatively, CMB masterbatch materials can also be placed in the CMB raw material storage bin using 25Kg packaged raw materials, and manually fed into the silo of the CMB feeding station. The silo of the feeding station is equipped with a low material level switch, which issues an alarm prompting feeding when the material level in the CMB feeding bin is low. Alternatively, CMB raw materials can also be directly transported from the raw material storage bin to the CMB buffer bin silo by negative pressure conveying.

[0054] Furthermore, when CA coupling agent is added, the large-packaged CA raw materials are manually lifted from the CA raw material storage bin by an electric hoist, put into the silo of the CA feeding station, and then delivered to the CA buffer bin by a negative pressure conveying device. CA coupling agent can also be placed in the CA raw material storage bin using 25Kg packaged raw materials, and manually put into the silo of the CA feeding station. The silo of the feeding station is equipped with a low material level switch, which will issue an alarm to prompt feeding when the material level in the CA feeding bin is low.

[0055] Furthermore, since PP resin 1, PP resin 2, CMB masterbatch and CA coupling agent are in granular form, it is necessary to use a fan to realize negative pressure transportation during the transportation process, and add a dust collector to remove dust from the surface of the granules. The negative pressure transportation of PP resin 1, PP resin 2, CMB masterbatch and CA coupling agent can also share the same fan and dust collector, or each fan and dust collector, or a combination of two.

[0056] Furthermore, when feeding the ADD additive (which has been evenly mixed with antioxidants and flame retardants), the large package of ADD additive raw materials is manually lifted by an electric hoist and put into the silo of the ADD feeding station. Alternatively, the ADD additive can also be placed in the ADD raw material storage silo using 25Kg packaging materials and manually put into the silo of the ADD feeding station. The ADD additive is then transported to the ADD buffer silo by the conveying screw, and the weighing sensor on the ADD buffer silo controls the screw conveying speed. The silo of the feeding station is equipped with a low level switch, which issues an alarm to prompt feeding when the material level in the ADD feeding silo is low. Since flame retardants and antioxidants are added to the ADD additive, the silo, conveying screw and ADD buffer silo of the ADD feeding station must meet the explosion-proof grade requirements.

[0057] S3: Send the raw materials in the buffer bin to the feeder system for weight adjustment.

[0058] Specifically, the buffer bin transports the raw materials to the feeder hopper through a pipeline, and the flow rate of the pipeline is controlled by a feed valve. At the same time, each buffer bin corresponds to a loss-in-weight feeder. The hopper is weighed, so a total of 5 loss-in-weight feeders are required, and then the PP1, PP2, CMB, CA and ADD raw materials are weighed and fed into the extruder. The feeder capacity is different for different raw materials. The capacity of the PP1 feeder is approximately 60kg / hr, the capacity of the PP2 feeder is approximately 200kg / hr, the capacity of the CMB feeder is approximately 100kg / hr, the capacity of the CA feeder is approximately 2500kg / hr, and the capacity of the ADD feeder is approximately 1500kg / hr. The specific feeder output capacity is shown in the table below. Figure 5 It should be noted that the PP resin can share a feeder with the PP resin 1 or the PP resin 2 to be fed and weighed before entering the extruder.

[0059] Furthermore, the feeder refill is controlled by the hopper weighing signal. When the hopper weight is lower than the set value, the corresponding feeder will send a refill signal to open the refill valve. When the hopper weight reaches the set high value, the refill signal disappears and the refill valve is closed. It should be noted that since flame retardants and antioxidants are added to the ADD additive, the ADD feeder and refill valve must also meet the explosion-proof grade requirements.

[0060] S4: The extruder mixes the raw materials of the feeding system to obtain molten PP resin.

[0061] Specifically, the raw materials in each feeder system enter the extruder through a pipeline, and are mixed in the feed hopper through the feed port of the extruder. In order to prevent the material from sticking to the inner wall of the feed hopper, the feed port of the extruder is provided with a cooling device to control the material temperature at 40 degrees. In this embodiment, a cooling device with a water cooling device is used. The exhaust port of the feed hopper is connected to a dust removal hood and connected to the dust removal system pipeline. It can also share a dust removal system with the dust removal system of the raw material. A high material level switch is installed on the upper part of the feed hopper. When the material reaches a high material level, an alarm is issued to prompt the operator to check the feed hopper. The extruder adopts a twin-screw extruder, which is provided with 6 control zones, and the 6 control zones are connected horizontally in sequence. The mixed raw materials enter the extruder from the first control zone, and the fourth and sixth control zones are provided with strong shear thread blocks to mix the raw materials evenly in the extruder to form a molten PP resin. The sixth control zone is connected to the seventh zone, and the seventh zone is a die head zone with another connecting block zone for connecting the screw zone and the die head. The molten resin is coated on the glass fiber in the die head zone. Therefore, there is no need to install filters and screen changers in the die head area. In order to match the discharge rate of glass fiber, the output of the extruder is controlled at 2500-4000kg / h.

[0062] Furthermore, the control area is divided into multiple barrel areas, of which each of the six control areas has a barrel area, and the die head area is divided into 3 barrel areas. In order to prevent the mixed material from cooling and solidifying in the barrel area, it is necessary to heat some barrel areas and provide temperature detection functions. The specific temperature control functions of each barrel area of ​​the extruder are as follows: Figure 6 shown.

[0063] S5: Control the glass fiber to be drawn out from the glass fiber station and pass into the waxing die head of the waxing machine for waxing so that the surface of the glass fiber is coated with a layer of wax liquid.

[0064] Specifically, the wax raw material is transported from the feeding station to the molten wax storage barrel, and then the molten product is pulled out from the glass fiber station and passed into the waxing die head of the waxing machine for waxing so that the surface of the glass fiber is coated with a layer of wax liquid raw material wax and stored and kept warm. The molten wax storage barrel is heated and kept warm by the mold temperature controller to prevent the molten wax from solidifying. Then the molten wax is filtered in the first step through the pre-filter, and then filtered twice through the gear pump and fine filter, and then sent to the waxing machine through the liquid wax pipeline.

[0065] Furthermore, the waxing machine is equipped with 4 metering pumps, each metering pump has 6 liquid wax pipeline outputs, totaling 24 liquid wax pipeline outputs. A flow meter is installed on each liquid wax pipeline to detect the flow of liquid wax, and a pressure sensor is installed to monitor the liquid wax pipeline. A three-way valve is also installed on the liquid wax pipeline to avoid the waste of liquid wax when the glass fiber breaks. When the glass fiber breaks, the three-way valve is reversed to allow the liquid wax pipeline to flow to the molten wax storage barrel.

[0066] S6: Control the waxed glass fiber to enter the die head of the extruder and combine with the molten PP resin for extrusion.

[0067] Specifically, the glass fiber is released from the glass fiber station. Generally, there are 24 glass fibers in the glass fiber station. The glass fibers pass through 24 glass guide tubes and are led to 24 stainless steel glass fiber slots. 24 friction sensors are installed above the glass fiber slots. Each glass fiber passes through a friction sensor, and then the glass fiber passes through the waxing die head and is wrapped by the aforementioned liquid wax for waxing. After waxing, the glass fiber enters the extruder die head and combines with the molten PP resin to form a material strip. It can also be set to 48 glass fiber materials as needed. At this time, the stainless steel glass fiber slots and friction sensors are set to 48, but the glass guide tubes are still installed to 24, which are divided into upper and lower rows to transport the glass fiber.

[0068] Furthermore, the friction sensor installed on the fiberglass station is used to detect whether the material strip is broken or disconnected. When a material strip is detected to have fallen or broken, the control system will sound an alarm, and the operator will close the valve of the molten PP resin discharge hole of the extruder die head corresponding to the material strip. The valve of the PP resin discharge hole of the extruder die head is equipped with a valve position sensor. When the valve is closed, the LFT control system will reduce the feeding speed of the loss-in-weight scale, the speed of the extruder, etc., to ensure the stability of the ratio of the output of the matching material in the extruder to the output of the glass fiber.

[0069] Furthermore, a glass fiber dust sensor collection device is separately provided for the glass fiber part, and the collection points include a bucket elevator and a friction sensor.

[0070] Furthermore, since the extruder is relatively large, in order to facilitate maintenance and angle adjustment, two fiber guide tubes are stacked end to end on the waxing machine system, which not only facilitates the maintenance of the extruder, but also allows the distance between the waxing machine and the extruder to be adjusted according to different needs. At the same time, the inclination angle of the fiber guide tube can be adjusted to adapt to the inclination angle of the extruder.

[0071] S7: Control the extruded glass fiber to enter the pelletizer for cutting and storage before packaging.

[0072] Specifically, the extruded glass fiber first enters the cooling system to cool down, and then enters the pelletizer to cut the long glass fiber into pellets. The pellets of different sizes and unqualified pellets are screened out through rolling screening and linear screening. The qualified pellets are sent to the post-mixing system, and the unqualified pellets are sent to the waste collection box.

[0073] Furthermore, in the post-mixing system, different specifications of pellets are sent to different bucket elevators and then to the silo for packaging. Before packaging, the pellets are electrostatically precipitated to avoid dust on the surface of the finished pellets. After filtering, the surface static electricity and dust are removed and kept warm for a period of time before entering the packaging stage.

[0074] S8: The finished particles in the post-mixing system enter the packaging system for packaging;

[0075] Specifically, the long glass fiber finished particles are filled into the packaging bag by the weighing packaging machine for packaging. In this embodiment, the packaging bag of the packaging system adopts an 8-corner straight-through paper bag, which can pack about 1 ton of finished products. It should be noted that the specifications of the packaging paper bag can be set according to needs and are not limited to the specifications mentioned in the present invention.

[0076] Based on the above embodiments:

[0077] like Figure 2 As shown, as a preferred embodiment, PP resin is sent to the storage bin after passing through a positive pressure conveying system and a drying system; comprising:

[0078] S11: unloading the PP resin from the PP resin station into the unloading bin of the feeding station;

[0079] Specifically, at the PP feeding station, the large package of PP resin is unloaded into the unloading bin of the feeding station by manually using a hoist or manually transported to the writing bin of the feeding station. In this embodiment, the volume of the unloading bin is 0.5m 3 The unloading bin is equipped with a low material level sensor. When the raw material level in the unloading bin is lower than the low material level threshold, an alarm signal is issued to prompt the operator to replenish the raw materials.

[0080] S12: The PP resin in the unloading bin is sent to the drying bin through the positive pressure conveying system;

[0081] Specifically, the PP resin in the discharge bin is discharged into the ejector through a rotary valve, and then the PP resin is transported to the PP drying bin by the pneumatic force provided by the positive pressure fan. The drying bin is designed to be 50m 3 , according to 80% volume ratio and PP bulk density of 0.6, it can hold about 24 tons of PP particle raw materials. Before starting production, it is necessary to feed the drying silo to its maximum capacity. After the drying silo is filled with PP materials, the drying operation to remove volatile organic compounds on the surface begins.

[0082] Furthermore, the feeding and conveying is a continuous process, and the production, feeding and conveying process continues. The conveying capacity of the positive pressure conveying system is 1 ton / hour, and the optional conveying equipment is 2 tons / hour.

[0083] S13: Drying and deodorizing the PP resin in the drying bin;

[0084] Specifically, after the PP resin is sent to the drying silo, the raw materials need to be dried. The drying system includes an air filter, a drying fan and an air heater. After the air is filtered through the air filter, it is pumped by the drying fan to the saturated steam of 150°C and 4Bar to heat the PP resin. The heated saturated steam is sent to the drying silo to dry and deodorize the PP resin. The hot air enters from the lower part of the cone of the drying silo, rises through the internal interlayer mesh, heats the PP resin, and is discharged from the top of the silo, enters the pipeline of the smoke purification device, and is purified by the smoke purification system and discharged into the atmosphere.

[0085] Furthermore, when the drying silo is fed with positive pressure before production begins, the air temperature entering the drying silo is controlled at 30-50°C, but the air temperature should not be too high. This process will last for about 24 hours until the PP resin delivered reaches the high material level. During this process, if the temperature is too high, the drying time of the raw materials in the silo will be different, resulting in different quality of the PP raw materials. After the PP resin in the silo is full, hot air heating and drying is carried out.

[0086] Furthermore, the temperature of the hot air during drying of the raw materials in the drying silo is 100-120°C, and the drying time is 36 hours. In this embodiment, a heat exchanger may be used to replace the air heater or other equipment that can heat the air. In order to facilitate air exchange in the drying silo, the cone part of the drying silo adopts a sandwich design.

[0087] S14: Cooling the dried PP resin and discharging it into a cooling bin;

[0088] Specifically, the dried PP resin is discharged into the cooling bin through a rotary valve, and the PP resin is cooled by the normal temperature air sent by the fan. A temperature sensor is installed at the bottom of the cooling bin. When the temperature is measured to be higher than 80°C, the rotary valve will be closed to stop discharging. When the temperature is measured to be lower than 80°C and continues for a certain period of time, the rotary valve will be opened to start discharging. When it is necessary to explain, the time can be set according to the process requirements, and no specific explanation is given here.

[0089] S15: The cooled PP resin is sent to the storage bin through a positive pressure conveying system;

[0090] Specifically, the cooling and discharging process is a continuous discharging process. The rotary valve continuously discharges the raw materials in the drying bin and drops them into the cooling bin. After being cooled in the cooling bin, the PP particles are continuously discharged by the rotary valve and drop into the ejector, and then are transported to the storage bin by positive pressure conveying. After cooling, the PP resin is transported to the PP resin storage bin by the positive pressure conveying system for storage and standby.

[0091] It should be noted that after the start of production, the feeding, positive pressure conveying (raw materials before drying), drying, cooling, positive pressure conveying (raw materials after drying) of PP resin is a continuous process. The PP drying silo continuously feeds at a conveying rate of 1 ton / hour, and the outlet continuously discharges the dried raw materials. The cooling silo continuously feeds, cools, and discharges, and the subsequent positive pressure conveying continuously transports the cooled PP resin into the storage silo.

[0092] Based on the above embodiments:

[0093] like Figure 3 As shown, as a preferred embodiment, the glass fiber is pulled out from the glass fiber station and then passes into the waxing die head of the waxing machine for waxing so that the surface of the glass fiber is coated with a layer of wax liquid. It includes:

[0094] S51: Put wax raw materials into a wax storage barrel and heat them into molten wax liquid.

[0095] Specifically, because the wax raw materials are generally granular solid materials, large bags and 25 kg small packages are available. The large package of granular wax raw materials is lifted by a walking hoist and placed on the feeding rack or manually carried to the feeding rack, and then transported to the storage barrel by a screw conveyor. Before production, the wax storage barrel is filled with wax raw materials, and then heated to above 120°C. At this time, the stirring paddle in the storage barrel is started to stir to accelerate the melting of the wax raw materials. When the temperature in the wax storage barrel is lower than 120°C, the stirring paddle stops stirring. The stirring paddle can only start stirring when the liquid level of the molten wax in the wax storage barrel is not lower than 1 / 3 of the liquid level in the storage barrel.

[0096] S52: Add wax raw materials into the wax storage barrel and keep the temperature of the wax storage barrel not lower than 140°C.

[0097] Specifically, when the wax storage barrel needs to be refilled, attention should be paid to the refilling speed to control the temperature of the molten wax liquid in the wax storage barrel. Since the raw wax is solid particles, heat is required to dissolve into liquid in the wax storage barrel, and the temperature of the molten wax liquid in the wax storage barrel must be ensured to be no less than 140°C.

[0098] Furthermore, when refilling the wax storage barrel, first open the pneumatic gate valve, the screw conveyor starts unloading, and the timing is 40S. If the temperature of the molten wax drops below 150℃ within 40S, the unloading process stops immediately, the pneumatic gate valve closes, and the conveyor stops; if the temperature of the molten wax remains above 150℃ within 40S, the conveyor stops after 40S, and starts unloading again after 20S, and the cycle continues until the molten wax stops at the set material level. The storage barrel is equipped with a liquid level sensor, and the screw conveyor stops automatically when the height of the molten wax in the barrel reaches the high liquid level.

[0099] S53: Use a mold temperature controller to keep the molten wax storage barrel warm at 155-160°C and perform nitrogen sealing protection.

[0100] Specifically, the molten wax storage barrel is insulated by a mold temperature controller, and the molten wax storage barrel is equipped with a temperature control device to maintain its temperature at 155-160°C.

[0101] In order to prevent the molten wax from deflagration, the molten wax storage tank is nitrogen sealed. The nitrogen flow rate is set to 1m 3 / h, the pressure is 0.3bar. A stirring paddle is installed on the top of the molten wax storage barrel. In normal operation, the stirring paddle continues to work. When the temperature of the molten wax in the barrel is lower than 120℃, the stirring paddle stops working.

[0102] S54: The molten wax liquid is filtered and then enters the waxing machine.

[0103] Specifically, in the process of conveying the molten wax liquid, in order to prevent the solid wax from entering the waxing machine, the molten wax liquid needs to be filtered. The molten wax from the molten wax storage tank is first pre-filtered by a coarse filter, and then further filtered by a conveying gear pump and a fine filter, and then the filtered molten wax liquid enters the waxing machine.

[0104] Further, to avoid filter failure, the coarse filter contains 2 filters, one in use and one as a spare. The transmission rate of the gear pump is 30-240kg / hr.

[0105] Furthermore, in order to avoid the molten wax liquid from cooling and solidifying during the transportation process and in the extruder, the liquid wax pipeline for transporting the molten wax liquid needs to be electrically heated and insulated to control the temperature of the molten wax liquid at 150°C.

[0106] S55: Control the output of liquid wax on the waxing machine.

[0107] Specifically, a flow meter is installed on the liquid wax pipeline to measure and detect the circulation speed of the liquid wax. Four variable frequency controlled metering pumps are installed on the waxing machine, and each metering pump controls the output of 6 liquid waxes, forming a total of 24 liquid wax pipelines to output the liquid wax. In order to detect whether the liquid wax pipeline is blocked, a pressure sensor is installed on each liquid wax pipeline. A total of 24 pressure sensors are installed on the 24 liquid wax pipelines to detect whether the 24 liquid wax pipelines are blocked.

[0108] Furthermore, in order to detect the flow rate of liquid wax, a flow meter is installed on the second of the 24 liquid wax pipes. When the flow meter detects that the flow value is lower or higher than the set flow value, the four metering pumps simultaneously adjust the speed to increase or decrease the speed, thereby adjusting the flow rate of the liquid wax.

[0109] Furthermore, in order to further stabilize the flow of the liquid wax, an accumulator is installed on each liquid wax pipeline to stabilize the flow of the liquid wax. 24 accumulators are arranged for 24 liquid waxes to stabilize the flow of the liquid wax.

[0110] Furthermore, in order to prevent the liquid wax pipeline from continuing to transport liquid wax when the glass fiber strip falls or is disconnected, a three-way valve is installed on the liquid wax pipeline. When the glass fiber strip is detected to have fallen or is disconnected, the three-way valve switches to send the liquid wax back to the reflux pipeline into the molten wax storage barrel. At the same time, the system issues an alarm to notify the staff to connect the glass fiber strip. When the system detects that the glass fiber strip is connected again, the three-way valve switches again to allow the liquid wax to flow into the waxing die head. The PLC or DCS system can be used to issue an alarm. A three-way valve is installed on each liquid wax pipeline to prevent the liquid wax from continuing to be transported after the glass fiber strip falls or is disconnected.

[0111] Furthermore, a glass fiber friction sensor is used to detect whether the glass fiber is broken. When the glass fiber friction sensor detects that the glass fiber strip has fallen or broken, or when the die head melt channel valve is manually closed, the three-way valve also rotates to return the liquid wax to the molten wax storage barrel. When the glass fiber friction sensor detects that the glass fiber strip has fallen or broken, the PLC or DCS program controls the calculation to reduce the capacity of the extruder, and at the same time closes the manual switch of the extruder die head to avoid the waste of liquid wax.

[0112] Furthermore, in order to prevent the liquid wax from cooling down on the waxing die head, four sets of thermocouples are installed on the waxing die head, each set of thermocouples corresponds to a metering pump, and 20 sets of heaters are installed to control the temperature of the liquid wax on the waxing die head at 160°C. However, when the temperature exceeds 160°C, the control system will sound an alarm, but there is no need to shut down the machine.

[0113] Based on the above embodiments:

[0114] like Figure 4 As shown, as a preferred embodiment, the extruded glass fiber is controlled to enter the pelletizer for cutting and then stored before packaging, including:

[0115] S71: Control the extruded glass fiber to enter the strip cooling system for cooling;

[0116] Specifically, in order to ensure the cross-sectional shape of the particles when the material strands pass through the pelletizer, the material strands coming out of the extruder first pass through the material strand cooling system to ensure the cross-sectional shape of the material strands. The temperature of the material strand cooling system is controlled at around 50°C. Too high a water temperature will lead to a decrease in the cooling effect of the material strands, resulting in the material strands passing through the pelletizer having an elliptical rather than a circular cross-sectional shape.

[0117] Furthermore, the strip cooling system uses three parallel cooling water troughs with a total length of 18 meters. Air knives are set at the outlet troughs so that when the long glass fiber strips pass through, the air knives remove the moisture on the surface of the strips before entering the pelletizer.

[0118] S72: Control the cooled material strips to enter the pelletizer for pelletizing;

[0119] Specifically, the feed amount of the feeder, the screw speed of the extruder and the flow rate of the waxing pump of the waxing machine are controlled by the rotation speed of the pelletizer. The feed amount of the feeder, the screw speed of the extruder and the flow rate of the waxing pump of the waxing machine are automatically adjusted as the rotation speed of the pelletizer changes.

[0120] Furthermore, the cooled material strips are pulled by the pelletizing pipe. When the device at one end of the material strip is clamped, the pelletizing blades are manually brought close to achieve uniform pelletizing at the speed of the pelletizer, thereby cutting the long glass fiber material strips into pellets. The size of the pellets coming out of the pelletizer can be controlled at about 3.5--5x15mm. The geometric size of the pellets is determined according to the actual scene needs. The collection points of the glass fiber dust collection device are also set at the pelletizer material strip inlet and pelletizer particle outlet.

[0121] S73: the pelletized material enters the screening system for screening;

[0122] Specifically, the size of the pellets after pelletizing is 3.5*5mm in diameter and 15mm in length, so it is necessary to screen its specifications and select the appropriate sieve mesh according to the glass fiber content to screen pellets of different sizes.

[0123] Furthermore, a rolling screen is used to separate particles of different sizes. The rolling screen is divided into three sections. The sieve hole size of the first two sections is 5*15mm, and the sieve hole size of the last section is 3.5*15mm, so that qualified particles are screened out first and unqualified particles are sent to a waste collection box.

[0124] Furthermore, a linear vibrating screen is set below the rolling screen to screen the particles of different sizes and then enter the linear vibrating screen for further screening. The qualified particles are sent to the post-mixer through the bucket elevator. The unqualified particles flow into the receiving pipe and are sent to the waste collection box by the vibrating conveyor.

[0125] Furthermore, a temperature detector is installed on the rolling screen, and the temperature of the pellets entering the bucket elevator is maintained at 80°C by adjusting the temperature of the front water tank.

[0126] S74: The qualified particles after screening are sent to the post-mixing system for preparation before packaging.

[0127] Specifically, the qualified finished particles after screening are first conveyed by a vibrating conveyor to an electrostatic precipitator for dust removal. At the same time, a fan is used to send air into the electrostatic precipitator to remove the dust on the surface of the finished particles, and then enter the dust collector for filtration. After filtration, they enter the electrostatic precipitator again. This cycle removes the static electricity and dust on the surface of the finished particles.

[0128] Furthermore, the finished particles after dust removal are sent to a post-mixer, the shell of which is provided with heat-insulating materials, and two post-mixers are provided, one for use and the other for backup. After the bucket elevator fills the entire silo with the delivered qualified finished particles, it is kept for a period of time, in this embodiment, after 10 minutes, and then packaging can be started. When one silo is full, the reversing valve switches the pipeline and turns to another finished product silo.

[0129] like Figure 8 As shown, the present invention provides a system structure diagram of a multi-point coating multifunctional polymer material enhancement production system.

[0130] Specifically, the present application also provides a multi-point coating type multifunctional polymer material enhancement production system, which is applied to a multi-point coating type multifunctional polymer material enhancement production process. The production system specifically includes: a PP feeding station and a positive pressure conveying system, a PP resin raw material drying and deodorization system, a raw material feeding station system, a feeder system, an extruder system, a waxing system and a glass fiber station, a material strip cooling and air drying system, a pelletizer system, a screening system, a post-mixing system and a packaging system.

[0131] For an introduction to a multi-point coating type multifunctional polymer material enhancement production process provided in the present application, please refer to the multi-point coating type multifunctional polymer material enhancement production process of the above-mentioned embodiment. The specific process will not be repeated here in this application.

[0132] After the PP resin is fed into the feeding station, it is sent into the drying bin through the positive pressure conveying system. The PP resin in the drying bin is sent into the PP resin drying and deodorization system to remove volatile organic compounds and then sent into the storage barrel. PP resin 1 and PP resin 2 that do not need to be dried, CMB masterbatch, CA coupling agent and ADD additives uniformly mixed with flame retardants and antioxidants are fed into the buffer bin through the feeding station system, and then the raw materials in the buffer bin and the storage barrel are weighed through the feeder system and fed into the extruder hopper, and the mixed raw materials are used to obtain molten PP resin in the extruder system; the wax raw material is heated into molten wax in the waxing system and then transported to the waxing machine die head through the wax liquid pipeline, and the glass fiber is coated on the surface of the glass fiber at the waxing machine die head after being sent out from the glass fiber station, and then combined with the molten PP resin at the glass fiber station to obtain long strips; the long strips are cooled by the cooling system and the air drying system, and then enter the pelletizer to cut the long strips into pellets; the pellets are screened out of different specifications and unfinished products by the screening system, and then the qualified pellets are sent to the post-mixing system for preparation before packaging; the surface of the pellets is dusted and static electricity is removed in the post-mixing system, and then sent to the packaging system for packaging. In order to avoid the waste of molten wax liquid, a pressure sensor is installed on the liquid wax pipeline and a friction sensor is installed on the glass fiber station to detect the breakage of the glass fiber. When the pressure sensor detects that the liquid wax pipeline is blocked, the valve will be closed to prevent the liquid wax from continuing to be output or sent back to the molten wax storage barrel through the reflux pipeline; when the friction sensor detects that the glass fiber stops moving, the three-way valve will send the molten wax back to the molten wax storage barrel through the reflux pipeline to avoid the waste of wax liquid. The process of the present invention can realize the automated production of long glass fiber reinforced resin and the uniformity of the resin coating layer, so that the product has higher strength and impact resistance, and ensures the stability of the ratio of glass fiber and resin, with the advantages of high rigidity and impact strength.

[0133] It should be noted that the process and system of the present application can also be applied to the production process and system of other similar polymer material reinforced products, such as fiber: glass fiber (including long carbon fiber, bio-based fiber), carbon fiber, bio-based fiber, engineering plastics, special engineering plastics: PA66, PPA, PPS, PEEK, thermoplastic olefin materials, thermosetting materials, etc. All should belong to the protection scope of the present invention. However, before carrying out the production process of other materials, it is necessary to use special cleaning materials to clean the entire process equipment, clean out the residual raw materials in it, and then carry out the same production process as above.

[0134] It should be understood that the present invention is described by some embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A multi-point coating multifunctional polymer material enhancement production process, comprising: Send PP resin from the PP resin station to the unloading bin of the feeding station; The PP resin in the unloading bin of the feeding station is sent to the cooling bin after removing the volatile organic compounds on the surface; The cooled PP resin is sent to the PP resin storage bin for standby use; Send PP resin 1, PP resin 2, CMB masterbatch, CA coupling agent and evenly mixed ADD additive raw materials from the feeding station into the buffer bin; The raw materials in the PP resin storage bin and the buffer bin are weighed by a feeding system and then fed into the feed port of the extruder; Control the glass fiber to move out of the glass fiber station and enter the extruder die head; After being pulled out from the glass fiber station, the glass fiber is passed through the waxing die head of the waxing machine for waxing so that the surface of the glass fiber is coated with wax liquid; it is characterized in that the waxing machine and the extruder are connected by two guide tubes stacked end to end, and the guide tubes are adjusted to adapt to the inclination angle of the extruder; The glass fiber coated with the wax liquid is controlled to move out from the waxing die head and enter the extruder die head to mix with the molten PP resin so that the surface of the glass fiber coated with the wax liquid is coated with the PP resin; Control the glass fiber combined with PP resin and wax liquid to extrude from the die head of the extruder to form material strips; A friction sensor is set on the glass fiber station to detect the status of the material strips. When it is detected that a certain material strip has fallen or broken, the valve of the molten PP resin discharge hole of the extruder die head corresponding to the material strip is closed.

2. The production process according to claim 1, characterized in that: The method of controlling the glass fiber to be drawn out from the glass fiber station and then passed into the waxing die head for waxing so that the surface of the glass fiber is coated with wax liquid comprises: The wax raw material is heated into molten wax liquid and then enters the waxing die head of the waxing machine for waxing.

3. The production process according to claim 2, characterized in that: After the wax raw material is heated into molten wax liquid, it enters the waxing die head of the waxing machine for waxing, including: The wax raw material is transported from the feeding station to the molten wax storage tank and heated into liquid wax; The liquid wax is filtered and then transported to the waxing machine through a liquid wax pipeline; During the transportation process, the liquid wax is heated at a constant temperature to prevent the liquid wax from solidifying.

4. The production process according to claim 3, characterized in that: The liquid wax pipeline is provided with a pressure sensor, and the pressure sensor is used to detect whether the liquid wax pipeline is blocked.

5. The production process according to claim 3, characterized in that: A three-way valve is installed on the liquid wax pipeline. When the glass fiber breakage is detected, the three-way valve is switched to send the wax liquid to the reflux pipeline and enter the molten wax storage barrel.

6. The production process according to claim 1, characterized in that: The method of controlling the glass fiber combined with the PP resin to be extruded from the die head of the extruder comprises: The controlled extruded glass fibers are fed into a pelletizer for cutting and then packaged and stored.

7. The production process according to claim 6, characterized in that: The method of controlling the extruded glass fiber to enter a pelletizer for cutting and then packaging and storing the same comprises: The glass fiber after being extruded is controlled to enter a cooling system for cooling and then enter a pelletizer for pelletizing; The feeding amount of the feeder, the screw speed of the extruder and the waxing pump flow rate of the waxing machine are controlled by the rotation speed of the pelletizer.

8. The production process according to claim 7, characterized in that: The method of controlling the extruded glass fiber to enter a cooling system for cooling and then enter a pelletizer for pelletizing comprises: The pellets coming out of the pelletizer enter the screening system; The screening system includes rolling screening and / or linear screening; The screened particles are sent to a post-mixing system for packaging.

9. A multi-point coating multifunctional polymer material enhanced production system, characterized in that: The invention is applied to the multi-point coating type multifunctional polymer material enhancement production process as described in any one of claims 1 to 8.

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