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Novel technology for manufacturing hot melt resin from waste and old polystyrene foam

A technology of waste polystyrene and foamed plastics, applied in the directions of graft polymer adhesives, adhesive types, adhesives, etc., can solve problems such as methods for direct copolymerization of polystyrene and vinyl acetate that are not reported in the literature , to achieve the effect of excellent performance, simple process and good monodispersity

Inactive Publication Date: 2012-10-17
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] These documents all utilize the method of coupling to realize the copolymerization of styrene monomer and vinyl acetate, and there is no method for direct copolymerization of polystyrene and vinyl acetate reported in the literature at present, and the present invention solves this difficult problem

Method used

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  • Novel technology for manufacturing hot melt resin from waste and old polystyrene foam
  • Novel technology for manufacturing hot melt resin from waste and old polystyrene foam
  • Novel technology for manufacturing hot melt resin from waste and old polystyrene foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using waste polystyrene plastic (WPSF) and monomer vinyl acetate (VAC) as raw materials, ammonium persulfate (APS) and sodium bisulfite as redox initiators, tricalcium phosphate and polyvinyl alcohol (PVA) as The dispersant is obtained through suspension polymerization to obtain vinyl acetate / polystyrene graft copolymer, which can be directly used as high-temperature-resistant hot-melt adhesive.

[0030] Step (1): Wash the waste polystyrene foam with deionized water, pulverize and dry it, then add monomer vinyl acetate into the reactor with a speed-regulating stirrer, insert a rotational viscometer into the reaction device , adjust the rotation speed of the agitator, so that the rheology of the polymerization system monitored online or a certain shear rate 20S -1 The viscosity at the bottom is 300-400mPa (the same below), connect the reactor to the condenser, thermometer, gradually add the polystyrene portion, mechanically stir to make it dissolve evenly.

[0031] Step...

Embodiment 2

[0038] Using waste polystyrene plastics, monomer butyl acrylate and vinyl acetate, and functional monomer acrylic acid as raw materials, ammonium persulfate and sodium bisulfite as initiators, tricalcium phosphate and hydroxyethyl cellulose as dispersants, The acrylate / styrene graft copolymer is obtained by suspension polymerization, which can be used as a hot-melt adhesive for book binding and paper packaging, and can also be used as a coating base material and adhesive after being dissolved in an organic solvent.

[0039] Step (1): first wash the waste polystyrene foam with deionized water, crush it, and dry it, then add monomer butyl acrylate (BA), vinyl acetate, functional monomer acrylic acid (AA) into the reactor, The reactor is connected with a condenser and a thermometer, and 35 parts of polystyrene is gradually added, and mechanically stirred to make it dissolve evenly.

[0040] Step (2): Add 1 part of sodium dodecylbenzenesulfonate, 3 parts of tricalcium phosphate an...

Embodiment 3

[0047] Using waste polystyrene plastics, vinyl acetate, and vinyl chloride as raw materials, benzoyl peroxide as an initiator, calcium carbonate and polyvinyl alcohol as a dispersant, the vinyl chloride grafted polystyrene powder is obtained through suspension polymerization Resins that can be used as high-impact plastics or plastic additives.

[0048] Step (1): washing waste polystyrene foam with deionized water, pulverizing and drying. Add monomer vinyl acetate and vinyl chloride into the reactor, insert a condenser tube and a thermometer on the reactor, gradually add polystyrene, and mechanically stir to dissolve them evenly.

[0049] Step (2): Add 5 parts of calcium carbonate and 3 parts of polyvinyl alcohol into the reactor, add 250 parts of water, continue stirring, and heat the system in a water bath to start heating up.

[0050] Step (3): When the temperature rises to 60°C, add 0.2 parts of the initiator benzoyl peroxide to the system, stir well, and turn on the conde...

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Abstract

The invention relates to a novel technology for producing modified polystyrene beaded hot melt resin by the utilization of waste and old polystyrene foam and belongs to the technical field of synthetic resin. Under the condition of an initiator, graft copolymerization or interpenetrating network polymerization of polystyrene broken chain or free radical and vinyl acetate producing monomers is carried out to prepare the P(PVc / BA) beaded resin which is not easy to prepare from a styrene monomer and a vinyl acetate monomer, thus realizing 100% recovery of waste and old polystyrene plastics. Through adjusting the formula, resins with a plurality of applications, such as plastic film, hot melt adhesive, foaming products and the like, can be prepared. According to another advanced technology provided by the invention, a rotary viscometer is inserted into the preparation device to monitor rheological property of a polymerization system or viscosity at a certain shear rate on line. Therefore, the size of polymer particles can be controlled such that bench scale experiment which is conducted in a lab can be simply repeated in mass production. Therefore, the problem that the diameter of the polymer particles is difficult to reproduce during amplification of the polymerization device is solved.

Description

technical field [0001] The invention relates to a new process for producing modified polystyrene bead-shaped hot-melt resin by using waste polystyrene foam plastics with simple process and low cost by controlling the polymerization process and formula. The invention belongs to the technical field of synthetic resin production and application. Background technique [0002] Expanded polystyrene plastic is a kind of general-purpose thermoplastic, which is obtained by polymerization of styrene monomer. It is mainly used in electrical appliances, instruments and meters, heat insulation materials, fast food, and shockproof packaging for vulnerable and valuables. The global annual consumption The volume reaches tens of millions of tons. However, due to the light weight, large volume and corrosion resistance of this kind of material, it is not easy to degrade under natural conditions, causing serious white pollution and destroying the ecological environment. How to deal with and u...

Claims

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Application Information

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IPC IPC(8): C08F257/02C08F218/08C08F2/18C08F2/20C08F2/01C09J151/06
Inventor 艾书伦郑鹏赖中强王卫珍沈晓琴周洋
Owner HUBEI UNIV
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