PK modification production system and process

Abstract

A PK modification production system comprises a mixing feed hopper and an extruder, the mixing feed hopper is connected with a silane coupling agent source, a PK source and an additive source, the downstream end of the mixing feed hopper supplies materials to the extruder, the extruder is connected with a vacuum source, and the discharge end of the extruder discharges modified PK products through a melt pump and an underwater granulator. The device is simple in structure and low in maintenance cost, PK products can be modified in a targeted mode, and market requirements are met.

Description

Technical Field

[0001] The present invention relates to the field of chemical industry, and in particular to a PK modification production system and process. Background Art

[0002] PK is polyketone resin, a hard and dense material with a smooth, white and shiny surface. It has a high elastic modulus, high rigidity and hardness, and its specific strength and specific rigidity are close to those of metals. It also has a low friction coefficient, is wear-resistant, and has good dimensional stability. Polyketone resin can partially replace copper, zinc, aluminum, steel and other metals and is widely used in automobiles, machinery manufacturing, precision instruments, office appliances, military and other industries. Polyketone resin has the characteristics of high hardness and wear resistance, so it is widely used in the manufacture of various gears, rollers, bearings, conveyor belts, springs, cams, bolts, and various pump bodies, housings, impeller friction bearings and other mechanical equipment structural parts.

[0003] PK is a linear crystalline polymer obtained by alternating copolymerization of carbon monoxide, ethylene and propylene. How to improve the physical and chemical performance indicators of PK products through modification, expand its application field and enhance the competitiveness of PK products is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] One of the purposes of the present invention is to provide a PK modification production system in view of the deficiencies in the prior art, which has a simple structure and low maintenance cost and can modify PK products in a targeted manner to meet market demand.

[0005] The second object of the present invention is to provide a process for modifying P using the above-mentioned modified production system, which has a simple process and mild operating parameters, and can obtain various PK modified products with stable quality and ensure stable quality.

[0006] The technical solution for achieving one of the purposes of the present invention is: a PK modification production system, comprising a mixing feed hopper and an extruder, wherein 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 feeds the extruder, the extruder is connected to a vacuum source, and the discharge end of the extruder discharges the modified PK product to the outside through a melt pump and an underwater pelletizer.

[0007] The connection point of the additive source, the silane coupling agent source and the mixing feed hopper is located upstream of the connection point of 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 technical solution for achieving the second object of the present invention is: a process for modifying PK using any of the above-mentioned modified production systems, comprising the following steps:

[0010] 1) The silane coupling agent is prepared into a 0.5% solution with water, the silane coupling agent solution is mixed with the additive by spraying, the additive is dried and then mixed with PK, and sent to the extruder;

[0011] 2) Control the extruder temperature to 170-190°C, the screw speed to 200r / min, and the vacuum degree to 50mmH 2 O. The residence time is 10min;

[0012] 3) The molten material discharged from the extruder is sent to the underwater pelletizer through a melt pump and is sheared into pelletized modified PK.

[0013] Step 1) The additive 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%, the addition ratio of IR is 15wt%, the addition ratio of PA66 is 20wt%, the addition ratio of PVDF is 20wt%, the addition ratio of short glass fiber is 20wt%, the addition ratio of calcium carbonate particles is 25wt%, and the addition ratio of benzophenone is 0.2wt%.

[0015] Step 1) The addition ratio of the 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 the present invention includes a mixing hopper and an extruder, wherein the mixing hopper is used to mix PK and a modifier, and the mixed materials are sent to the extruder. The extruder is used to melt the mixed materials and discharge the molten materials for cooling and pelletizing. The mixing hopper is connected to a silane coupling agent source, a PK source, and an additive source, and the materials are pre-mixed. The silane coupling agent is prepared into a 0.5% solution with water. The silane coupling agent solution is mixed with the additive by spraying, and a silane coupling agent solution film is formed on the surface of the additive. After drying, the silane coupling agent is evenly dispersed on the surface of the silane coupling agent and then mixed with PK. The downstream end of the mixing hopper feeds the extruder, and the extruder is connected to a vacuum source. The ash generated during the melting process of the mixture, such as unstable oligomers of pyrolysis, residual low-boiling impurities, and light components brought in by the additives, is discharged in the form of tail gas, thereby reducing the impurity content in the molten material and ensuring the stable quality of the modified PK. The discharging end of the extruder discharges the modified PK product through a melt pump and an underwater pelletizer.

[0018] 2. The connection point of the additive source, silane coupling agent source and the mixing feed hopper of the PK modification production system of the present invention is located upstream of the connection point of the PK source and the mixing feed hopper. In the plastic processing process, the silane coupling agent can improve the melt fluidity and molding processing performance of the plastic, reduce the energy consumption and cost in the processing process, and reduce thermal degradation and oxidation phenomena, improve the yield rate and quality stability of plastic products, and the silane coupling agent enhances the interaction force between the plastic molecular chains through its special molecular structure, thereby improving the mechanical performance indicators such as tensile strength, bending strength and impact strength of the plastic. The present invention firstly disperses the silane coupling agent uniformly on the surface of the modifier in the form of solution spray, and dries it, and the modifier carries the silane coupling agent and uniformly disperses it in the mixture, thereby ensuring the dispersion effect of the silane coupling agent.

[0019] 3. The modification method of the present invention aims at the defect that the PK polyketone resin is a weakly polar linear polymer, and the -CO segment contained in it is difficult to mix with the additive. First, the silane coupling agent is prepared into a 0.5% solution with water, and the silane coupling agent solution is sprayed on the surface of the additive in a thin layer. After drying, a protective film is formed on the surface of the additive, which can effectively improve the compatibility between the modified systems and ensure the quality stability of the modified PK polyketone resin. Then it is sent to the extruder and extruded at 190°C for 10 minutes to avoid the decomposition of the PK polyketone resin during the modification process and ensure the quality stability of the modified PK polyketone resin.

[0020] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] In the accompanying drawings, 1 is a mixing feed hopper, 2 is an extruder, 3 is a melt pump, and 4 is an underwater pelletizer. DETAILED DESCRIPTION

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

[0024] Table of standard and purity of additives used for modification

[0025]

[0026]

[0027] Example 1

[0028] See also Figure 1The PK modified production system includes a mixing feed hopper 1 and an extruder 2. The mixing feed hopper 1 is connected to a silane coupling agent source, a PK source, and an additive source. Specifically, the connection points of the additive source, the silane coupling agent source, and the mixing feed hopper are located upstream of the connection point of the PK source and the mixing feed hopper. The downstream end of the mixing feed hopper 1 feeds the extruder 2, and the extruder 2 is connected to a vacuum source. Specifically, the extruder 2 is a twin-screw extruder with a screw speed of 200r / min. The discharge end of the extruder discharges the modified PK product to the outside through a melt pump 3 and an underwater pelletizer 4.

[0029] Typically, the modified production system is configured with multiple production lines, such as 7, which are AG in sequence, and each production line has the same structure.

[0030] The main equipment specifications are as follows:

[0031] Device Name Specification quantity Material Mixing hopper A~G <![CDATA[V=0.6m 3 ,DN=500,H=800]]> 1 S30408 Extruder A~G Processing capacity Q = 1.2t / h 1 combination Melt pump A~G Processing capacity Q = 1.2 / h 1 S30408 Underwater pelletizer A~G Processing capacity Q = 1.2t / h 1 combination Additive silo 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] The modified PK product was synthesized using the modified production system of Example 1:

[0034] Different additives are added according to the product brand, the formula is as follows:

[0035]

[0036]

[0037] Additives, base material (PK polyketone resin), and silane coupling agent are mixed in a mixing hopper and sent to an extruder. The temperature of the extruder is controlled at 170-190°C, the screw speed is 200r / min, and the vacuum degree of the extruder is 50mmH 2 O, the residence time is 10min, the molten material discharged from the extruder is sent to the underwater pelletizer through the melt pump, and the granular modified PK polyketone resin is obtained by pelletizing, which is then sent to the silo after solid-liquid separation and drying.

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

[0039]

Claims

1. A PK modified production system, characterized in that: It comprises a mixing feed hopper (1), an extruder (2), The mixing feed hopper (1) is connected to a silane coupling agent source, a PK source, and an additive source. The downstream end of the mixing feed hopper (1) feeds the extruder (2), the extruder (2) is connected to a vacuum source, and the discharge end of the extruder discharges the modified PK product to the outside through a melt pump (3) and an underwater pelletizer (4).

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

3. The PK modified 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. A process for modifying PK using any modified production system according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) The silane coupling agent is prepared into a 0.5% solution with water, the silane coupling agent solution is mixed with the additive by spraying, the additive is dried and mixed with PK, and sent to the extruder; 2) Control the extruder temperature to 170-190°C, the screw speed to 200r / min, the vacuum degree to 50mmH2O, and the residence time to 10min; 3) The molten material discharged from the extruder is sent to the underwater pelletizer through a melt pump and is sheared into pelletized 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%, the addition ratio of IR is 15wt%, the addition ratio of PA66 is 20wt%, the addition ratio of PVDF is 20wt%, the addition ratio of short glass fiber is 20wt%, the addition ratio of calcium carbonate particles is 25wt%, and the addition ratio of benzophenone is 0.2wt%.

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

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