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Device and method for preparing SAN resin with stable composition and low volatile components

A low-volatile, resin-based technology, applied in the field of polymer material preparation, can solve the problems of wide distribution of monomer material composition, high concentration of unreacted monomer and solvent, etc., to improve mechanical properties, reduce the risk of thermal degradation, and stabilize the composition Effect

Inactive Publication Date: 2022-01-04
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the problem of wide distribution of monomer material composition in the reactor and high concentration of unreacted monomer and solvent after devolatilization in the current SAN heat-induced free radical continuous bulk polymerization process, and provide a preparation with stable and low composition Device and method for volatilizing SAN resin

Method used

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  • Device and method for preparing SAN resin with stable composition and low volatile components
  • Device and method for preparing SAN resin with stable composition and low volatile components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The styrene monomer of 75 parts by weight, the acrylonitrile monomer of 25 parts by weight, the toluene accounting for 25% by weight of the monomer, and the chain transfer agent n-dodecyl mercaptan accounting for 0.15% by weight of the monomer are in the feed tank After being mixed evenly, it is continuously injected into the reaction kettle through the feeding pump, and the polymerization reaction is carried out at 150°C for 3 hours to obtain the reaction mixture; the built-in cooling coil in the reaction kettle controls the acrylonitrile vapor to condense instantly at the top of the kettle and return to the reaction kettle to participate in polymerization. Ensure that the composition of styrene and acrylonitrile monomers and the final SAN resin in the reaction system is stable;

[0053] Start the discharge gear pump, the flash tank devolatilizer, and the twin-screw devolatilization extruder for devolatilization, and at the same time start the feeding pump, adjust the s...

Embodiment 2

[0056] The styrene monomer of 75 parts by weight, the acrylonitrile monomer of 25 parts by weight, the toluene that accounts for 25% by weight of the monomer, the chain transfer agent n-dodecyl mercaptan that accounts for 0.15% by weight of the monomer in the batching tank After mixing evenly in the medium, it was continuously injected into the reaction kettle through the feeding pump, and the polymerization reaction was carried out at 160°C for 2.5 hours. Other processes are the same as in Example 1. The performance test results of the product are shown in Table 1.

Embodiment 3

[0058] The styrene monomer of 75 parts by weight, the acrylonitrile monomer of 25 parts by weight, the toluene that accounts for 25% by weight of the monomer, the chain transfer agent n-dodecyl mercaptan that accounts for 0.15% by weight of the monomer in the batching tank After mixing evenly in the mixture, it was continuously injected into the reaction kettle through the feeding pump, and the polymerization reaction was carried out at 170°C for 2 hours. Other processes are the same as in Example 1. The performance test results of the product are shown in Table 1.

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Abstract

The invention provides a device and a method for preparing SAN resin with stable composition and low volatile components, and belongs to the field of high polymer material preparation methods. According to the method, the SAN resin is prepared by adopting continuous bulk polymerization of thermal-initiated free radicals, acrylonitrile steam is controlled to instantaneously condense and flow back to a reaction kettle to participate in polymerization at the top of the kettle through a built-in condensing coil at the top of the polymerization kettle, and stable composition of styrene and acrylonitrile monomers and the final SAN resin in a reaction system is ensured. A two-stage devolatilization mode in which two static flash tanks are connected in series in the conventional SAN resin preparation process is optimized into a one-stage flash tank static devolatilization and two-stage double-screw devolatilization extruder dynamic devolatilization mode, so that the thermal degradation risk of the SAN resin at the high temperature of the two-stage devolatilization device is effectively reduced, and the mechanical property, transparency and appearance quality of the SAN resin are improved. Meanwhile, compared with the devolatilization effect of a two-stage series static flash tank, the volatile component content of the SAN resin obtained by the process is lower and can reach 600-700ppm.

Description

technical field [0001] The invention belongs to the field of polymer material preparation methods, and in particular relates to a device and method for preparing SAN resin with stable composition and low volatile content. Background technique [0002] SAN resin is a binary random copolymer of styrene and acrylonitrile, which has excellent transparency, high mechanical strength, good heat resistance and chemical properties. SAN resin is mainly used as a transparent structural material or as a matrix material for ABS resin. It is widely used in the fields of electronic appliances, automobiles, building materials, furniture, sports and entertainment products, machinery and instrumentation industries. [0003] SAN resin can be prepared by emulsion polymerization, suspension polymerization, and bulk polymerization based on the principle of free radical initiated copolymerization. At present, the leading synthesis technology of SAN in industrial production is heat-initiated conti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18B01J19/00C08F212/08C08F220/44C08F2/38B29B9/06
CPCB01J19/18B01J19/0013B01D3/065C08F212/08B29B9/06C08F220/44C08F2/38
Inventor 孙树林张会轩谭志勇曹春雷
Owner CHANGCHUN UNIV OF TECH
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