CN110281499A - A kind of production technology of high-strength injection plastic pipe - Google Patents

Abstract

The invention discloses a production process of high-strength injection-molded pipe fittings, including batching, stirring, extrusion of blanks, vacuum setting and cut-to-length cutting; the invention can greatly increase the number of injection-molded pipe fittings by adding modified polyvinyl chloride resin in the production process of injection-molded pipe fittings. The tensile strength and toughness, by adding fluoroelastomer processing aids, can make the surface finish of the prepared injection molded pipe fittings higher, the combination of the two can effectively improve the quality of the production of injection molded pipe fittings, and use machinery instead of manpower for extrusion. It can make the components in the raw materials mix evenly and make the extrusion billet more uniform and finer, and the entire extrusion billet process is fully automated, which greatly improves production efficiency, effectively reduces labor intensity, and can promote better rotation performance of the extrusion screw, reducing The consumption of energy and the loss of the extruding screw facilitate the connection between the end of the discharge hopper and the storage cabinet, which is convenient for operation.

Description

A production process of high-strength injection-molded pipe fittings

technical field

The invention belongs to the technical field of injection molding pipe fittings production, in particular to a production process of high-strength injection molding pipe fittings.

Background technique

The patent number is _CN1186382C , which discloses a nano-polyvinyl chloride high-strength porous sleeve and pipe fittings and its production method. additives, impact modifiers, processing modifiers, flame retardants; the method for producing sleeves includes the following steps: batching, stirring, extrusion, vacuum setting, cut-to-length, inspection, packaging, storage . With the development of the economy, the biggest hot spot of agricultural water transmission and distribution is the wide application of new pipes and pipe fittings. People's requirements for irrigation water utilization efficiency are getting higher and higher, especially the reasonable selection of pipe fittings plays a vital role in ensuring the safe and stable operation of the water transmission and distribution network. At present, there are mainly three kinds of pipe fittings commonly used in agricultural water transmission and distribution: injection molding pipe fittings, metal pipe fittings and composite pipe fittings. The surface smoothness is not enough and the surface is prone to spots, which seriously affects the production quality of injection molded pipe fittings. Due to long-term use, injection molded pipe fittings are prone to cracking, and the service life is short, which increases production costs;

The existing injection molding pipe fittings have certain deficiencies in the production process. The production efficiency is relatively low. The connection between the hopper and the storage cabinet brings inconvenience to the staff and increases labor intensity.

Contents of the invention

In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a production process for high-strength injection-molded pipe fittings, specifically solving the following problems:

(1) The tensile strength and toughness of traditional injection-molded pipe fittings are insufficient, the surface of injection-molded pipe fittings is relatively rough, and the quality cannot be guaranteed;

(2) In the process of extruding the ingredients, the expected ingredients cannot be extruded in a circular manner, the uniformity of the extruded ingredients is not enough and the particle size is large, and the production efficiency is relatively low;

(3) The energy consumption and the loss of each component are large, resulting in a shorter service life of each component and increasing production costs.

The purpose of the present invention can be achieved through the following technical solutions:

A production process of high-strength injection molding pipe fittings, the production process of the injection molding pipe fittings specifically includes the following steps:

Ingredients: 80 parts by weight of modified polyvinyl chloride resin, 4-6 parts by weight of heat stabilizer, 3-5 parts by weight of flame retardant, 2-3 parts by weight of processing modifier, 2-4 parts by weight of lubricant, and Mix 4-8 parts by weight of the fluoroelastomer processing aid evenly to obtain the mixture a;

Stirring: Add mixture a to a high-speed mixer and stir, raise the temperature to 100°C at a rate of 10°C/min, then stir in a cooling mixer, cool down to 40°C at a rate of 5°C/min, and obtain mixture b ;

Extrusion billet: Mixed material b is added into the extruder barrel through the feed port, wherein the feed port is connected with the extruder barrel, the drive motor is started to rotate, and the chain drives the extrusion screw to rotate, and the extrusion screw runs through the No. The bracket, the No. 2 bracket and the bearing sleeve are arranged, and the balls in the bearing sleeve promote the rotation of the extrusion screw, so that the rotating tablet circulates in the extrusion barrel to extrude the raw material, and the components in the mixture b are mixed evenly. And with the rotation of the rotary tabletting, the mixture b continuously moves to the right, and cooperates with the guide screw to extrude the billet, wherein a connecting rod is connected between the guide screw and the connecting block to ensure the stability of the guide screw during rotation. The slider slides on the chute, driving the discharge hopper to discharge the billet, where the slider is combined with the chute, and the discharge hopper can move left and right to connect with the storage cabinet;

Mold shaping: inject the extruded blank into the molding machine for shaping to obtain molded injection molding pipe fittings;

Cut-to-length: Cut the molded injection molding pipe fittings to length to obtain injection molding pipe fittings of different specifications.

As a further solution of the present invention: the modified polyvinyl chloride resin described in the batching step is prepared from the following raw materials in parts by weight: 4-6 parts of nano calcium carbonate, 60-72 parts of chlorinated polyvinyl chloride resin powder and polyvinyl chloride 5-7 parts of vinyl resin.

As a further solution of the present invention: the thermal stabilizer in the batching step uses a phosphite stabilizer system, the flame retardant uses antimony trioxide, the processing modifier uses an acrylate modifier, and the lubricant uses metal soaps and one of stearic acid.

As a further solution of the present invention: the fluoroelastomer processing aid in the compounding step is a fluorocarbon high polymer, including fluorocarbon copolymers and homopolymers, and is at least one of tetrafluoroethylene, hexafluoroethylene and vinylidene fluoride A copolymer or homopolymer of one or more monomers.

As a further solution of the present invention: in the stirring step, the speed of the high-speed mixer is controlled at 400-450r/min, and the speed of the cooling mixer is controlled at 100-120r/min.

As a further solution of the present invention: in the vacuum setting step, the temperature in the molding machine is changed twice. First, the temperature is controlled to rise to 100-150° C. at a constant speed of 15° C./min, and then rise to 100-150° C. 190-240°C. Second, control the temperature to drop to 30-50°C at a constant speed of 25°C/min.

As a further solution of the present invention: when the extruder is in use in the step of extruding the billet, the raw material after stirring is first placed in the extruder barrel through the feed port, wherein the feed port is communicated with the extruder barrel, and the drive is started. The motor rotates, and the chain drives the extrusion screw to rotate. The extrusion screw runs through the No. 1 bracket, the No. 2 bracket and the bearing sleeve. The inner circulation extrudes the raw material, so that the components in the raw material are mixed evenly, and the raw material continuously moves to the right with the rotation of the rotary tablet, and the billet is extruded with the guide screw, and the gap between the guide screw and the connecting block is A connecting rod is connected to make the guide screw more stable during rotation. Secondly, the slider slides on the chute to drive the discharge hopper to discharge the billet. connect.

Beneficial effects of the present invention:

1. In the process of preparing the mixture a, after the polyvinyl chloride resin is chlorinated, the irregularity of the molecular chain arrangement increases, the polarity increases, the solubility of the resin increases, and the chemical stability increases, thereby improving the quality of the material. Excellent heat resistance and corrosion resistance of acids, alkalis, salts, oxidants, etc. By adding polyvinyl chloride resin in the production process of injection molding pipe fittings, the tensile strength and toughness of injection molding pipe fittings can be greatly increased. After vulcanization, it has good low temperature and high temperature performance, good fluidity, alkali resistance and high surface cleanliness. By adding fluoroelastomer processing aids, the surface finish of the prepared injection molding pipe fittings can be made higher. The combination of the two can effectively improve To ensure the quality of the production of injection molded pipe fittings.

2. In the production process of extrusion blanks for injection molding pipe fittings, the extruder is controlled by the control panel to process the raw materials after stirring, and the extrusion is performed by machinery instead of manpower. Under the action of the driving motor, the extrusion is driven by the chain The screw rotates, so that the rotary pressing tablet circulates in the extruder barrel to extrude the raw material, so that the components in the raw material can be mixed evenly, and the rotating pressing tablet can drive the raw material to move to the right while extruding. The guide screw of the same specification guides the billet out, making the extruded billet more uniform and finer, and the entire extrusion billet process is fully automated, which greatly improves production efficiency, effectively reduces labor intensity, and has strong practicability.

3. In the process of extruding the billet by the extruder, the distribution of balls in the bearing sleeve can promote the better rotation performance of the extrusion screw, reduce energy consumption and the loss of the extrusion screw, and have a better protective effect. The combination of the slider and the chute can facilitate the installation and disassembly of the discharge hopper, and at the same time facilitate the sliding of the discharge hopper on the support frame, so that the end of the discharge hopper can be connected with the storage cabinet, which is convenient for operation, and the two right ends of the discharge hopper The buffer block on the side is fitted with the support frame pillar, which can prevent the discharge hopper from sliding off the support frame and reduce the friction between the discharge hopper and the support frame, which is more practical.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is a production process flow chart of the present invention.

Fig. 2 is a schematic diagram of the overall structure of the extruder in the present invention.

Fig. 3 is a partial structural schematic diagram of the extruder in the present invention.

Fig. 4 is a top view of Fig. 3 in the present invention.

Fig. 5 is a schematic structural view of No. 2 stent in the present invention.

Fig. 6 is a schematic diagram of the installation of the discharge hopper in the present invention.

In the figure 1. Support frame; 2. Outer frame; 3. Material inlet; 4. Chain guard; 5. Drive motor; 10. Bearing sleeve; 11. Extrusion screw; 12. Rotary tablet; 13. Chain; 14. Connecting block; 15. Guide screw; 16. Slider; 17. Connecting rod; , channel; 20, chute; 21, buffer block.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1

As shown in Figure 1-6, a production process of high-strength injection-molded pipe fittings, the production process of the injection-molded pipe specifically includes the following steps:

Ingredients: 60 parts by weight of modified polyvinyl chloride resin, 5 parts by weight of heat stabilizer, 4 parts by weight of flame retardant, 2 parts by weight of processing modifier, 3 parts by weight of lubricant, and 5 parts by weight of fluoroelastomer processing aid mixed preparation;

Stirring: Put the prepared raw materials in a high-speed mixer for stirring, control the temperature to rise to 100°C at a rate of 10°C/min, and then place them in a cooling mixer for stirring again, and cool the temperature of the controller to 100°C at a rate of 5°C/min. 40°C;

Extrusion billet: the stirred raw material is placed in the extruder barrel through the feed port 3, wherein the feed port 3 is connected with the extruder barrel, the drive motor 5 is started to rotate, and the chain 13 drives the extrusion screw 11 to rotate, and the extruder is extruded. The pressing screw 11 runs through the No. 1 support 7, the No. 2 support 8 and the bearing sleeve 10. The balls in the bearing sleeve 10 promote the rotation of the extrusion screw 11, so that the rotating pressing piece 12 circulates in the extruder barrel to extrude the raw material. , each component in the raw material is mixed with each other evenly, and with the rotation of the rotary tablet 12, the raw material continuously moves to the right, and cooperates with the guide screw 15 to extrude the billet;

Mold shaping: use the injection molding mechanism to inject the extruded billet into the molding machine for shaping;

Cut-to-length: Use a cutting machine to cut the molded injection-molded pipe fittings to length to obtain injection-molded pipes of different specifications.

Example 2

The specific steps of the production process of the high-strength injection-molded pipe fittings are as follows:

Ingredients: 80 parts by weight of modified polyvinyl chloride resin, 6 parts by weight of heat stabilizer, 5 parts by weight of flame retardant, 3 parts by weight of processing modifier, 4 parts by weight of lubricant, and 7 parts by weight of fluoroelastomer processing aid mixed preparation;

Stirring: Put the prepared raw materials in a high-speed mixer for stirring, control the temperature to rise to 100°C at a rate of 10°C/min, and then place them in a cooling mixer for stirring again, and cool the temperature of the controller to 100°C at a rate of 5°C/min. 40°C;

Extrusion billet: the stirred raw material is placed in the extruder barrel through the feed port 3, wherein the feed port 3 is connected with the extruder barrel, the drive motor 5 is started to rotate, and the chain 13 drives the extrusion screw 11 to rotate, and the extruder is extruded. The pressing screw 11 runs through the No. 1 support 7, the No. 2 support 8 and the bearing sleeve 10. The balls in the bearing sleeve 10 promote the rotation of the extrusion screw 11, so that the rotating pressing piece 12 circulates in the extruder barrel to extrude the raw material. , each component in the raw material is mixed with each other evenly, and with the rotation of the rotary tablet 12, the raw material continuously moves to the right, and cooperates with the guide screw 15 to extrude the billet;

Mold shaping: use the injection molding mechanism to inject the extruded billet into the molding machine for shaping;

Cut-to-length: Use a cutting machine to cut the molded injection-molded pipe fittings to length to obtain injection-molded pipes of different specifications.

The modified polyvinyl chloride resin in the compounding step is prepared from the following raw materials in parts by weight: 4-6 parts of nano calcium carbonate, 60-72 parts of chlorinated polyvinyl chloride resin powder and 5-7 parts of polyvinyl chloride resin.

In the batching step, the heat stabilizer is a phosphite stabilizer system, the flame retardant is antimony trioxide, the processing modifier is an acrylic modifier, and the lubricant is one of metal soaps and stearic acid. kind.

The fluoroelastomer processing aid described in the compounding step is a fluorocarbon high polymer, including fluorocarbon copolymers and homopolymers, and is at least one or several monomers of tetrafluoroethylene, hexafluoroethylene and vinylidene fluoride. Copolymer or Homopolymer.

In the stirring step, the speed of the high-speed mixer is controlled at 400-450r/min, and the speed of the cooling mixer is controlled at 100-120r/min.

In the vacuum setting step, the temperature in the molding machine is changed twice. First, the temperature is controlled to rise to 100-150°C at a constant speed of 15°C/min, and then rise to 190-240°C at a constant speed of 5°C/min. , and control its temperature to drop to 30-50°C at a constant speed of 25°C/min.

When the extruder is in use in the step of extruding the billet, the raw material after stirring is first placed in the extruder barrel through the feed port 3, wherein the feed port 3 is connected with the extruder barrel, and the driving motor 5 is started to rotate. The chain 13 drives the extrusion screw 11 to rotate, and the extrusion screw 11 runs through the No. 1 support 7, the No. 2 support 8 and the bearing sleeve 10, and the balls provided in the bearing sleeve 10 promote the rotation of the extrusion screw 11, so that the rotary pressing piece 12 The raw material is extruded in circulation in the extruder barrel, so that the components in the raw material are mixed evenly, and with the rotation of the rotary tablet 12, the raw material continuously moves to the right, and cooperates with the guide screw 15 to extrude the billet. A connecting rod 17 is connected between the material screw 15 and the connecting block 14, so that the material guide screw 15 is more stable during rotation, and secondly, the slider 16 slides on the chute 20 to drive the discharge hopper 6 to discharge the billet, wherein the slider 16 Combined with the chute 20, the discharge hopper 6 can move left and right to connect with the storage cabinet.

The extruder in the extruded billet includes a support frame 1, an outer frame 2 is installed on the upper end of the support frame 1, and the outer frame 2 is provided with a material inlet 3 near the left end, and an organic barrel is arranged inside the outer frame 2, and the barrel and the input Port 3 is connected, a chain guard 4 is installed on one side of the outer frame 2, a drive motor 5 is installed on one side of the bottom end of the chain guard 4, and a discharge hopper 6 is installed on the support frame 1, and the discharge hopper 6 is located on the right side of the outer frame 2 At the bottom position, the No. 1 support 7 and the No. 2 support 8 are installed in parallel on both sides of the upper end of the support frame 1, and the No. 2 support 8 is provided with a bearing plate 9 at a parallel position on the side away from the No. 1 support 7, and the upper end of the support plate 9 is at the middle position A bearing sleeve 10 is installed, and balls are distributed in the bearing sleeve 10, which can promote better rotation performance of the extrusion screw 11, reduce energy consumption and loss of the extrusion screw 11, and run through the No. 1 bracket 7 and No. 2 bracket 8 The extruding screw 11 is connected with the bearing sleeve 10, and the extruding screw 11 is provided with a rotary pressing tablet 12. The rotating pressing tablet 12 can circulate in the extruder barrel to extrude the raw material, so that the components in the raw material can interact with each other. Mix evenly, the left end of the extrusion screw 11 is covered with a chain 13, and a slider 16 is installed across the support frame 1;

A connecting block 14 is installed at the middle position of the side of the No. 2 support 8, and a circular plate 18 is arranged around the connecting block 14, and a guide screw 15 is installed on the installing circular plate 18, and a connecting rod 15 is connected between the guide screw 15 and the connecting block 14. Connecting rod 17, No. 2 support 8 is provided with channel 19 near the bottom end position, and support frame 1 upper end bottom position is provided with chute 20, and slide block 16 is combined with chute 20, can be convenient to the left and right movement of discharge hopper 6, discharge hopper 6 is connected with the storage cabinet, which is convenient to operate. The buffer stoppers 21 are arranged symmetrically on both sides of the right end of the discharge hopper 6, which can prevent the discharge hopper 6 from sliding off the support frame 1 and can reduce the friction between the discharge hopper 6 and the support frame 1. protective effect.

The working principle of the extruder: First, the stirred raw materials are placed in the extruder barrel through the feed port 3, wherein the feed port 3 is connected to the extruder barrel, and the driving motor 5 is started to rotate, and the chain 13 is used to drive the extrusion The screw 11 rotates, and the extrusion screw 11 runs through the No. 1 support 7, the No. 2 support 8 and the bearing sleeve 10. The balls provided in the bearing sleeve 10 can promote the better rotation performance of the extrusion screw 11, reducing energy consumption and extrusion. The loss of the screw 11 makes the rotary tablet 12 circulate in the extruder barrel to extrude the raw material, so that the components in the raw material can be mixed evenly with each other. With the rotation of the rotary tablet 12, the raw material continuously moves to the right. The feed screw 15 extrudes the billet, wherein a connecting rod 17 is connected between the guide screw 15 and the connecting block 14, which can make the guide screw 15 more stable during rotation, and then slide on the chute 20 through the slider 16, Drive the discharge hopper 6 to discharge the billet, wherein the slider 16 is combined with the chute 20, which can facilitate the left and right movement of the discharge hopper 6, and the discharge hopper 6 is connected with the storage cabinet, which is convenient for operation. The buffer block 21 fits with the pillar of the support frame 1, which can prevent the discharge hopper 6 from sliding off the support frame 1 and can reduce the friction between the discharge hopper 6 and the support frame 1, which has a better protective effect.

In the description of this specification, descriptions with reference to the terms "one embodiment", "example", "specific example" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment of the present invention. In an embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above content is only an example and description of the structure of the present invention. Those skilled in the art make various modifications or supplements to the described specific embodiments or replace them in similar ways, as long as they do not deviate from the structure of the invention or Anything beyond the scope defined in the claims shall belong to the protection scope of the present invention.

Claims (6)

1. A production process of high-strength injection-molded pipe fittings, characterized in that, comprising the following steps: Ingredients: 80 parts by weight of modified polyvinyl chloride resin, 4-6 parts by weight of heat stabilizer, 3-5 parts by weight of flame retardant, 2-3 parts by weight of processing modifier, 2-4 parts by weight of lubricant, and Mix 4-8 parts by weight of the fluoroelastomer processing aid evenly to obtain the mixture a; Stirring: Add mixture a to a high-speed mixer and stir, raise the temperature to 100°C at a rate of 10°C/min, then stir in a cooling mixer, cool down to 40°C at a rate of 5°C/min, and obtain mixture b ; Extrusion billet: Mixed material b is added into the extruder barrel through the feed port, wherein the feed port is connected with the extruder barrel, the drive motor is started to rotate, and the chain drives the extrusion screw to rotate, and the extrusion screw runs through the No. The bracket, the No. 2 bracket and the bearing sleeve are arranged, and the balls in the bearing sleeve promote the rotation of the extrusion screw, so that the rotating tablet circulates in the extrusion barrel to extrude the raw material, and the components in the mixture b are mixed evenly. And with the rotation of the rotary tabletting, the mixture b continuously moves to the right, and cooperates with the guide screw to extrude the billet, wherein a connecting rod is connected between the guide screw and the connecting block to ensure the stability of the guide screw during rotation. The slider slides on the chute, driving the discharge hopper to discharge the billet, where the slider is combined with the chute, and the discharge hopper can move left and right to connect with the storage cabinet; Mold shaping: inject the extruded blank into the molding machine for shaping to obtain molded injection molding pipe fittings; Cut-to-length: Cut the molded injection molding pipe fittings to length to obtain injection molding pipe fittings of different specifications. 2. The production process of a high-strength injection-molded pipe fitting according to claim 1, wherein the modified polyvinyl chloride resin in the batching step is prepared from the following raw materials in parts by weight: nano calcium carbonate 4-6 60-72 parts of chlorinated polyvinyl chloride resin powder and 5-7 parts of polyvinyl chloride resin. 3. A production process for high-strength injection-molded pipe fittings according to claim 1, characterized in that, the heat stabilizer in the batching step adopts a phosphite-based stabilizing system, the flame retardant uses antimony trioxide, and the processing is modified. The stabilizer is an acrylate modifier, and the lubricant is one of metal soaps or stearic acid. 4. The production process of a high-strength injection-molded pipe fitting according to claim 1, wherein the speed of the high-speed mixer in the stirring step is controlled at 400-450r/min, and the speed of the cooling mixer is controlled at 100-120r/min min. 5. A production process for high-strength injection-molded pipe fittings according to claim 1, characterized in that, in the step of vacuum setting, the temperature in the molding machine is changed twice, the first is to rise to 100°C at a constant speed of 15°C/min -150°C, then rise to 190-240°C at a constant speed of 5°C/min, and secondly, drop to 30-50°C at a constant speed of 25°C/min. 6. The production process of a high-strength injection-molded pipe fitting according to claim 1, characterized in that, when the extruder is in use in the step of extruding the billet, the stirred raw materials are first placed in the extruder through the feed port In the barrel, the feed port is connected with the extruder barrel, start the drive motor to rotate, cooperate with the chain to drive the extrusion screw to rotate, the extrusion screw runs through the No. 1 bracket, the No. Prompt the rotation of the extruding screw, so that the rotary tablet circulates in the extruder barrel to extrude the raw material, so that the components in the raw material are mixed evenly, and the raw material moves to the right continuously with the rotation of the rotary tablet, and cooperates with the guide The material screw extrudes the billet, and a connecting rod is connected between the guide screw and the connecting block, so that the guide screw is more stable during rotation, and secondly, the slider slides on the chute to drive the discharge hopper to discharge the billet. The block is combined with the chute, the discharge hopper can move left and right to connect with the storage cabinet, and the extruded billet can enter the storage cabinet through the discharge hopper.