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MMA continuous prepolymerization system and technology

A prepolymerization and process technology, applied in the MMA continuous prepolymerization system and its process field, can solve the problems of quality difference, unfavorable control reaction, extrusion time, inability to realize continuous polymerization extrusion molding, etc.

Inactive Publication Date: 2021-10-29
TAIXING TOMSON ACRYLIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional casting production, the latest extrusion molding method has attracted the attention of relevant domestic manufacturers. The existing MMA polymerization extrusion is completed by a screw extruder, which needs to complete feeding, mixing, polymerization, and devolatilization. , Extrusion and a series of processes, the polymerization reaction of MMA requires a corresponding reaction residence time of 15min-20min. If a screw extruder is used, it faces the following problems: because sufficient reaction time must be left, the length of the screw polymerization reaction zone Longer, resulting in longer overall length of the equipment, doubling the manufacturing cost; longer reaction residence time in one extruder, thus restricting the final extrusion rate, unable to achieve continuous polymerization extrusion molding, indirectly reducing production capacity, and It is very easy to cause local quality differences on the same forming sheet, which affects product quality; the temperature requirements of the polymerization reaction zone and the extrusion zone are inconsistent, and the large temperature difference causes a large loss of temperature control energy, which is not conducive to controlling the reaction and extrusion time

Method used

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  • MMA continuous prepolymerization system and technology
  • MMA continuous prepolymerization system and technology
  • MMA continuous prepolymerization system and technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] MMA continuous pre-polymerization process steps are as follows:

[0035] a. Batching and feeding: Add MMA monomer, initiator and chain transfer agent with a weight ratio of 99:0.65:0.35 to each tank respectively, and each tank is injected into the reactor through the respective feed flow meters through the metering pump according to the proportion Inside, the extrusion injection flow rate of the reactor is 3kg / min, and the total amount is 80kg;

[0036] b. Reactor heating and stirring: set the temperature of the oil temperature machine to a value between 110°C, and heat the mixed fluid in the reactor at a constant temperature. When heating, the stirring blade of the reactor is turned on, and the rotation speed is 80r / min;

[0037] c. Torque calibration: for the first feed reaction, the flow meter at the bottom of the reactor sends out the polymerization solution several times, and the different viscosities of the polymerization solution are detected and the torque senso...

Embodiment 2

[0041] MMA continuous pre-polymerization process steps are as follows:

[0042] a. Batching and feeding: Add MMA monomer, initiator and chain transfer agent with a weight ratio of 99:0.65:0.35 to each tank respectively, and each tank is injected into the reactor through the respective feed flow meters through the metering pump according to the proportion Inside, the extrusion injection flow rate of the reactor is 4kg / min, and the total amount is 80kg;

[0043] b. Reactor heating and stirring: set the temperature of the oil temperature machine to a value between 100°C, and heat the mixed fluid in the reactor at a constant temperature. When heating, the stirring blade of the reactor is turned on, and the rotation speed is 70r / min;

[0044] c. Torque calibration: for the first feed reaction, the flow meter at the bottom of the reactor sends out the polymerization solution several times, and the different viscosities of the polymerization solution are detected and the torque senso...

Embodiment 3

[0048] MMA continuous pre-polymerization process steps are as follows:

[0049] a. Batching and feeding: Add MMA monomer, initiator and chain transfer agent with a weight ratio of 99:0.65:0.35 to each tank respectively, and each tank is injected into the reactor through the respective feed flow meters through the metering pump according to the proportion Inside, the extrusion injection flow rate of the reactor is 5kg / min, and the total amount is 80kg;

[0050] b. Reactor heating and stirring: set the temperature of the oil temperature machine to a value between 90°C, and heat the mixed fluid in the reactor at a constant temperature. When heating, the stirring blade of the reactor is turned on, and the rotation speed is 50r / min;

[0051] c. Torque calibration: for the first feed reaction, the flow meter at the bottom of the reactor sends out the polymerization solution several times, and the different viscosities of the polymerization solution are detected and the torque sensor...

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Abstract

The invention relates to an MMA continuous prepolymerization system and technology. The MMA continuous prepolymerization system comprises an MMA tank, an initiator tank, a chain transfer agent tank, metering pumps and a reaction kettle; a jacket is arranged outside the reaction kettle, the MMA tank, the initiator tank and the chain transfer agent tank are respectively connected to an input header pipe through the feeding metering pumps, and the input header pipe is connected to the upper end of the reaction kettle through a static mixer and a one-way valve in sequence; a stirring paddle is arranged in the reaction kettle, the upper end of the stirring paddle extends out of the reaction kettle and is connected with a speed reducing motor through a torque sensor; and the bottom of the reaction kettle is conveyed out of an extruder unit through a discharging metering pump for continuous polymerization extrusion. The technology is simple, can be suitable for continuous extrusion, molding and supply of a pre-polymerization liquid, stably controls the polymerization rate and viscosity of the pre-polymerization liquid, can facilitate later polymerization, extrusion time and temperature control, and considers both polymerization efficiency and extrusion efficiency.

Description

technical field [0001] The invention relates to acrylic production technology, in particular to an MMA continuous prepolymerization system and its technology. Background technique [0002] With the wide application of acrylic, higher and higher requirements are put forward for its production timeliness and quality. Compared with traditional casting production, the latest extrusion molding method has attracted the attention of relevant domestic manufacturers. The existing MMA polymerization extrusion is completed by a screw extruder, which needs to complete feeding, mixing, polymerization, and devolatilization. , Extrusion and a series of processes, the polymerization reaction of MMA requires a corresponding reaction residence time of 15min-20min. If a screw extruder is used, it faces the following problems: because sufficient reaction time must be left, the length of the screw polymerization reaction zone Longer, resulting in longer overall length of the equipment, doubling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/92B29C48/40B29C48/405C08F120/14
CPCB29C48/92B29C48/405B29C48/404C08F120/14C08F2/01
Inventor 汤月生肖建霞林海成伟汤佳晨宋飞凡震山
Owner TAIXING TOMSON ACRYLIC CO LTD
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