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Device for producing expandable polystyrene by bulk method

A technology of expanded polystyrene and body, which is applied in transportation and packaging, chemical instruments and methods, chemical/physical/physicochemical processes, etc., and can solve the problems of high energy consumption, poor product stability, and high labor intensity in batch polymerization processes , to achieve the effect of excellent appearance, less oligomer and impurity content, and low residual monomer

Pending Publication Date: 2022-07-15
粟中民
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The products obtained by this suspension process have various disadvantages, such as: a very wide bead size distribution, which requires screening to fractionate and discard some beads; limitations in the production of special products, such as colored beads and / or containing foreign fillers or additives Microbeads, such as nucleating agents and / or flame retardants, are difficult to incorporate into beads or they can inhibit polymerization; toxic styrene monomer residues in polymers are difficult to be below 1000ppm; in aqueous media In the process, the suspension and dispersant should be added, the water consumption is large, a large amount of sewage is produced, and there are environmental protection problems; the batch polymerization process has problems such as high energy consumption, high labor intensity, and poor product stability.

Method used

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  • Device for producing expandable polystyrene by bulk method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 It is the process flow diagram of the production of foamable polystyrene by the ontology method of the patent. The device used for producing the foamable polystyrene in this specific embodiment includes: a polymerization reaction unit (1), a head set on the polymerization reaction unit (1). There is a material inlet, and a reaction stirrer (2) is installed in the middle, which is also connected to the condenser (3). The upper end of the volatilizer (5) is connected with a condenser (7), and the condenser (7) is connected to the vacuum liquid collecting tank (8); the heating devolatilizer (5) is connected to the mixer (9) and the melt through the pump (6) below. The heat exchanger (10) is connected, and the melt heat exchanger (10) is connected with the high-pressure underwater pelletizing system (12) through a pump (11).

[0029] The polymerization reaction unit (1) adopts a reactor. During operation, according to the following weight parts, 92.5 kg of styrene...

Embodiment 2

[0038] In this example, on the basis of Example 1, the polymerization reaction unit (1) adopts two reactors connected in series, and a third fluid, namely the flame retardant polystyrene masterbatch interface, is added at the front inlet of the mixer (9). The third fluid is flame retardant polystyrene masterbatch, which contains 0.7kg of flame retardant. The third stream of fluid flame retardant polystyrene masterbatch is extruded and input to the front inlet of the mixer (9) and the first stream of fluid polystyrene, and the second stream of fluid foaming agent into the dynamic mixer (9) After shearing and mixing evenly, it is cooled down to the material temperature of 205 ℃ by the melt heat exchanger (10), and then input to the high-pressure underwater pelletizing system (12) by the pump (11) to be pelletized and dried to obtain the finished flame-retardant expandable polyphenylene vinyl pellets. After testing, the oxygen index of flame-retardant expandable polystyrene reac...

Embodiment 3

[0046] On the basis of Example 1, the polymerization reaction unit (1) used in this example adopts 5 reactors connected in series, and a third fluid, that is, polyphenylene containing graphite and flame retardant, is added at the front inlet of the mixer (9). Vinyl masterbatch interface, which contains 2.0kg of graphite and 0.3kg of flame retardant. The third stream of fluid flame retardant polystyrene masterbatch is extruded and input to the front inlet of the mixer (9) and the first stream of fluid polystyrene, and the second stream of fluid foaming agent into the dynamic mixer (9) After shearing and mixing evenly, it is cooled down to the material temperature of 205°C by the melt heat exchanger (10), and then input to the high-pressure underwater pelletizing system (12) by the pump (11) for granulation and drying into finished graphite-type expanded polystyrene particles . After testing, the oxygen index of flame-retardant expandable polystyrene reaches 32, which meets the...

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Abstract

A device for producing expandable polystyrene by a bulk method comprises a polymerization reaction unit which is connected with a heating devolatilization device through a discharge pump; the upper end of the heating devolatilization device is connected with a condenser and a vacuum liquid collection tank; and the lower part of the heating devolatilization device is connected with a mixer, a melt heat exchanger, a pump and a high-pressure underwater pelletizing system through a pump. The device can be used for producing flame-retardant expandable polystyrene (EPS) and can also be used for producing graphite expandable polystyrene (EPS). The materials in the polymerization reaction unit comprise the following components in parts by weight: 80-95 kg of styrene, 2-10 kg of a solvent and 0.5-8 kg of an auxiliary agent. The particle size of the obtained expandable polystyrene EPS ranges from 0.7 mm to 1.0 mm, residual monomers are low, waste water is little, and the environment-friendly effect is good.

Description

technical field [0001] The invention relates to the technical field of foamable polystyrene resin, in particular to a device for producing foamable polystyrene. Background technique [0002] The production of expanded polystyrene (EPS) from styrene as the main raw material is very important for the quality control of expanded polystyrene. The existing process for producing foamable polystyrene is through a suspension batch polymerization process. The main steps are: using a suspension dispersant to disperse the liquid styrene monomer in an aqueous medium, and adding a polymerization initiator in a stirred and heated reactor. When the monomer is added with a foaming agent at a certain conversion rate, the polymerization is completed; discharge, wash, dry and sieve to obtain foamable polystyrene beads. The diameter of the beads ranges from 0.1 mm to 4 mm. The products obtained by this suspension process have several disadvantages, such as: very broad bead size distribution, ...

Claims

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Application Information

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IPC IPC(8): B01J19/18B01J19/00B01F33/82C08F112/08C08F2/02C08F2/01C08F6/28C08J9/20B29B9/06
CPCB01J19/18B01J19/1862B01J19/0053B01J19/0066B01J19/0013C08F112/08C08F6/003C08J9/20B29B9/06C08J2325/06C08F2/02C08F2/01
Inventor 粟中民李桂银周治德
Owner 粟中民
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