A PK modification production system and process

Abstract

A PK modification production system includes a mixing hopper and an extruder. The mixing hopper is connected to a silane coupling agent source, a PK source, and an additive source. The downstream end of the mixing hopper supplies material to the extruder, which is connected to a vacuum source. The outlet end of the extruder discharges the modified PK product via a melt pump and an underwater pelletizer. This invention has a simple structure, low maintenance costs, and can specifically modify PK products to meet market demands.

Description

Technical Field

[0001] This invention relates to the chemical industry, and in particular to a PK modification production system and process. Background Technology

[0002] PK stands for polyketide resin, a smooth, white, glossy, hard, and dense material with high elastic modulus, high rigidity and hardness. Its specific strength and specific rigidity are close to those of metals, and it has a low coefficient of friction, good wear resistance, and good dimensional stability. Polyketide resin can partially replace metals such as copper, zinc, aluminum, and steel in industries such as automobiles, machinery manufacturing, precision instruments, office and household appliances, and military applications. Due to its high hardness and wear resistance, polyketide resin is widely used in the manufacture of various gears, rollers, bearings, conveyor belts, springs, cams, bolts, and structural components of mechanical equipment such as pump bodies, housings, impeller friction bearings, etc.

[0003] PK is a linear crystalline polymer obtained by alternating copolymerization of carbon monoxide, ethylene, and propylene. How to improve the physicochemical properties of PK products through modification, and to expand their application areas and enhance their competitiveness, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] One of the objectives of this invention is to address the shortcomings of existing technologies by providing a PK modification production system that has a simple structure, low maintenance costs, and can specifically modify PK products to meet market demands.

[0005] The second objective of this invention is to provide a process for modifying P using the above-mentioned modified production system. This process is simple, has mild operating parameters, and can produce various PK modified products with stable quality, while ensuring consistent quality.

[0006] One of the technical solutions to achieve the objective of this invention is: a PK modification production system, including a mixing feed hopper and an extruder. The mixing feed hopper is connected to a silane coupling agent source, a PK source, and an additive source. The downstream end of the mixing feed hopper supplies material to the extruder. The extruder is connected to a vacuum source, and the discharge end of the extruder discharges modified PK products to the outside via a melt pump and an underwater pelletizer.

[0007] The connection point between the additive source, the silane coupling agent source and the mixing feed hopper is located upstream of the connection point between the PK source and the mixing feed hopper.

[0008] The extruder is a twin-screw extruder with a screw speed of 200 r / min.

[0009] The second technical solution to achieve the objective of this invention is: using any of the above-mentioned modified production systems to modify PK, including the following steps:

[0010] 1) Prepare a 0.5% solution of silane coupling agent with water. Mix the silane coupling agent solution with the additive by spraying. After the additive is dried, mix it with PK and send it to the extruder.

[0011] 2) Control the extruder temperature to 170-190℃, screw speed to 200r / min, vacuum to 50mmH2O, and residence time to 10min;

[0012] 3) The molten material discharged from the extruder is pumped to an underwater pelletizer and sheared into granulated modified PK.

[0013] The additive mentioned in step 1) is any one of PP, IR, PA66, PVDF, short glass fiber, calcium carbonate particles, and benzophenone.

[0014] Step 1) The addition ratio of PP is 10wt%, IR is 15wt%, PA66 is 20wt%, PVDF is 20wt%, short glass fiber is 20wt%, calcium carbonate particles are 25wt%, and benzophenone is 0.2wt%.

[0015] Step 1) The addition ratio of silane coupling agent is 0.55 wt%.

[0016] The above technical solution has the following beneficial effects:

[0017] 1. The PK modification production system provided by this invention includes a mixing hopper and an extruder. The mixing hopper is used to mix PK and modifiers. The mixed material is fed to the extruder, which melts the mixed material and discharges the molten material for cooling and pelletizing. The mixing hopper is connected to a silane coupling agent source, a PK source, and an additive source. Pre-mixing is performed by preparing a 0.5% solution of silane coupling agent with water. The silane coupling agent solution is mixed with the additives via spraying, forming a thin film of silane coupling agent solution on the surface of the additives. After drying, the silane coupling agent is uniformly dispersed on the surface of the silane coupling agent before being mixed with PK. The downstream end of the mixing hopper supplies material to the extruder, which is connected to a vacuum source. Ash generated during the melting process, such as unstable oligomers from pyrolysis, residual low-boiling-point impurities, and light components introduced by the additives, is discharged as exhaust gas, reducing the impurity content in the molten material and ensuring stable quality of the modified PK. The modified PK product is discharged from the outlet end of the extruder via a melt pump and an underwater pelletizer.

[0018] 2. In this invention, the connection point between the additive source, silane coupling agent source, and mixing feed hopper of the PK modification production system is located upstream of the connection point between the PK source and the mixing feed hopper. During plastic processing, the silane coupling agent can improve the melt flowability and molding performance of plastics, reduce energy consumption and costs during processing, reduce thermal degradation and oxidation, and improve the yield and quality stability of plastic products. Through its special molecular structure, the silane coupling agent enhances the interaction force between plastic molecular chains, thereby improving the tensile strength, flexural strength, and impact strength of the plastic. In this invention, the silane coupling agent is first uniformly dispersed on the surface of the modifier in the form of solution spray and then dried. The modifier carries the silane coupling agent to be uniformly dispersed in the mixture, ensuring the dispersion effect of the silane coupling agent.

[0019] 3. The modification method of this invention addresses the defect that PK polyketone resin is a weakly polar linear polymer, and its -CO segments are difficult to mix with additives. First, a 0.5% solution of silane coupling agent is prepared using water. This silane coupling agent solution is sprayed onto the surface of the additive in a thin layer. After drying, a protective film forms on the additive surface, effectively improving the compatibility between the modified systems and ensuring the quality stability of the modified PK polyketone resin. The resin is then fed into an extruder and extruded at 190°C for 10 minutes to prevent decomposition of the PK polyketone resin during modification, thus ensuring the quality stability of the modified PK polyketone resin.

[0020] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the connection of the modified production system of the present invention.

[0022] In the attached diagram, 1 is the mixing feed hopper, 2 is the extruder, 3 is the melt pump, and 4 is the underwater pelletizer. Detailed Implementation

[0023] In this invention, the standard degree and purity of the additives used for modification are as follows:

[0024] Table of Standards and Purity of Additives Used in Modification

[0025]

[0026]

[0027] Example 1

[0028] See Figure 1The PK modification production system includes a mixing hopper 1 and an extruder 2. The mixing hopper 1 is connected to a silane coupling agent source, a PK source, and an additive source. Specifically, the connection points between the additive source, the silane coupling agent source, and the mixing hopper are located upstream of the connection point between the PK source and the mixing hopper. The downstream end of the mixing hopper 1 supplies material to the extruder 2, which is connected to a vacuum source. Specifically, the extruder 2 is a twin-screw extruder with a screw speed of 200 r / min. The modified PK product is discharged from the extruder's outlet via a melt pump 3 and an underwater pelletizer 4.

[0029] Typically, a modified production system is set up with multiple production lines, such as 7, numbered AG in sequence, with each production line having the same structure.

[0030] The main equipment specifications are as follows:

[0031] Equipment Name Specification quantity Material Mixing feed hoppers A to G <![CDATA[V=0.6m 3 ,DN=500,H=800]]> 1 S30408 Extruders A to G Processing capacity Q = 1.2 t / h 1 combination Melt pumps A to G Processing capacity Q = 1.2 / h 1 S30408 Underwater pelletizers A to G Processing capacity Q = 1.2 t / h 1 combination Additive silos A-G <![CDATA[V=1.5m 3 ,DN=1000,H=1500]]> 1 S30408 Loss-in-weight feeder A Power W = 1.5kW, capacity 91kg / h 1 S30408 Loss-in-weight feeder B Power W = 2kW, capacity 137kg / h 1 S30408 Loss-in-weight feeder C Power W = 2.5kW, capacity 183kg / h 1 S30408 Loss-in-weight feeder D Power W = 4.0kW, capacity 229kg / h 1 S30408 Loss-in-weight feeder E Power W = 2.5kW, capacity 183kg / h 1 S30408 Loss-in-weight feeder F Power W = 4.0kW, capacity 229kg / h 1 S30408 Loss-in-weight feeder G Power W = 0.1kW, capacity 2kg / h 1 S30408

[0032] Example 2

[0033] Modified PK products were synthesized using the modified production system of Example 1:

[0034] Different additives are added depending on the product brand, as follows:

[0035]

[0036]

[0037] Additives, base material (PK polyketone resin), and silane coupling agent are mixed in a mixing hopper and then fed to an extruder. The temperature of the extruder is controlled at 170-190℃, the screw speed is 200r / min, the extruder vacuum is 50mmH2O, and the residence time is 10min. The molten material discharged from the extruder is pumped to an underwater pelletizer, where it is pelletized to obtain granular modified PK polyketone resin. After solid-liquid separation and drying, the resin is sent to a silo.

[0038] The material balance data for each piece of equipment are as follows:

[0039]

Claims

1. A PK modification production system, characterized in that: It includes a mixing feed hopper (1) and an extruder (2). The mixing feed hopper (1) is connected to the silane coupling agent source, PK source, and additive source. A 0.5% solution of the silane coupling agent is prepared with water. The silane coupling agent solution is then mixed with the additive via spraying. After the additive is dried, it is mixed with PK and fed to the extruder (2) through the downstream end of the mixing hopper (1). The extruder (2) is connected to a vacuum source, and the modified PK product is discharged from the outlet end of the extruder through the melt pump (3) and the underwater pelletizer (4). The temperature of the extruder is controlled at 170-190℃.

2. The PK modification production system according to claim 1, characterized in that: The connection point between the additive source, the silane coupling agent source and the mixing feed hopper is located upstream of the connection point between the PK source and the mixing feed hopper.

3. The PK modification production system according to claim 1, characterized in that: The extruder (2) is a twin-screw extruder with a screw speed of 200 r / min.

4. The process for modifying PK using any one of the modified production systems of claims 1-3, characterized in that, The following steps are involved: 1) Prepare a 0.5% solution of silane coupling agent with water. Mix the silane coupling agent solution with the additive by spraying. After the additive is dried, mix it with PK and send it to the extruder. 2) Control the extruder temperature to 170-190℃, screw speed to 200r / min, vacuum to 50mmH2O, and residence time to 10min; 3) The molten material discharged from the extruder is pumped to an underwater pelletizer and sheared into granulated modified PK.

5. The process according to claim 4, characterized in that, Step 1) The additive is any one of PP, IR, PA66, PVDF, short glass fiber, calcium carbonate particles, and benzophenone.

6. The process according to claim 5, characterized in that, Step 1) The addition ratio of PP is 10wt%, IR is 15wt%, PA66 is 20wt%, PVDF is 20wt%, short glass fiber is 20wt%, calcium carbonate particles are 25wt%, and benzophenone is 0.2wt%.

7. The process according to claim 4, characterized in that, Step 1) The addition ratio of silane coupling agent is 0.55 wt%.

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