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Method for preparing coating resin by using waste polystyrene plastics

A technology of waste polystyrene and polystyrene solution, applied in plastic recycling, coating, recycling technology and other directions, can solve problems such as unfavorable environmental protection, organic solvent volatilization, low utilization rate, etc., to improve utilization rate and adhesion Improve and improve the effect of the environment

Active Publication Date: 2011-04-27
JIANGSU BANGJIE ANTI CORROSION THERMAL INSULATIONTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this method is: because polystyrene is the macromolecular resin of extra large molecular weight, can only form the polystyrene solution that solid content is 10~15 mass % with solvent direct dissolution, most polystyrene fails to utilize, not only The utilization rate is low and a large amount of organic solvents will volatilize when used, which is not conducive to environmental protection and cost reduction; in addition, if the recycled polystyrene is directly used for coatings, not only the high glass transition temperature of polystyrene makes it difficult to make coatings after coating The film is too brittle, and because polystyrene has no active groups, it cannot react with the curing agent, so the performance of the formed coating film is relatively poor, which affects the scope of use of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 prepares coating resin with waste polystyrene plastics

[0018] The concrete operating steps of the inventive method are as follows:

[0019] ① Degradation: Dissolve the waste polystyrene plastics after washing and drying in xylene and put them into the reactor, add a catalyst (alkaline solution of ethylene glycol ethyl ether acetate with a tin naphthenate content of 1% by mass) and heated to reflux, degrade under reflux until the viscosity is 100-200cps at 145°C, stop the degradation, then distill off the solvent to make 145°C viscosity of 100-200cps and a solid content of 60 mass% degraded polyphenylene Ethylene solution, save for later use;

[0020] The mass ratio of each raw material used is as follows, waste polystyrene plastics: xylene: catalyst is 6: 3.9: 0.1;

[0021] ②Grafting modification: Put the degraded polystyrene solution obtained in step ① into the reactor, and when it is heated to 60°C±2°C, add the initiator cyclohexanone peroxide into th...

Embodiment 2

[0023] Embodiment 2 prepares two-component paint

[0024] The coating formulation by mass % is as follows:

[0025] Resin (made in Example 1) 60, titanium dioxide 15, barium sulfate 15, talcum powder 5, solvent 4.2, organic bentonite (BP186) 0.8;

[0026] Mix the above components evenly and grind to a fineness of 25 microns as the hydroxyl component;

[0027] Before use, mix the above-mentioned hydroxyl component and curing agent (HXF trimer) at a mass ratio of 5:1 and then apply.

[0028] Embodiment 3 uses the coating that embodiment 2 makes, by relevant coating national standard, prepares sample and carries out sample performance test, concrete result is as follows:

[0029] Impact strength kg cm ≥ 50;

[0030] Flexibility (mm) 1;

[0031] Adhesion (level) 1

[0032] Water resistance 168h, no bubbles, no rust spots, no discoloration;

[0033] Weather resistance 240h without exception;

[0034] Salt spray resistance 600h no abnormality;

[0035] Gasoline resistance 12...

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Abstract

The invention relates to a method for preparing coating resin by using waste polystyrene plastics, which comprises the following steps: firstly, decomposing the waste polystyrene plastics to prepare a decomposed polystyrene solution of which the temperature is 145 DEG C, the viscosity is 100 to 200 cps and the solid content is 50 to 65 mass percent; secondly, using cyclohexanone peroxide as an initiating agent to perform graft modification on the decomposed polystyrene by using a flexible monomer, a functional monomer and an adhesion-enhancing monomer in turn through free radical polymerization so as to obtain the coating resin, wherein the flexible monomer is acrylic-2-ethyl hexyl ester preferably, the functional monomer is acrylic-beta-hydroxyl propyl ester preferably, and the adhesion-enhancing monomer is glycidyl methacrylate preferably. The method not only improves the utilization rate of the polystyrene, reduces the dosage of a harmful solvent (xylene), improves the environment and reduces the harms to human bodies, but also improves the performance of the resin prepared by using the waste polystyrene plastics.

Description

technical field [0001] The invention relates to a method for preparing resin for paint by using waste polystyrene plastics. Background technique [0002] At present, the output of polystyrene plastic in polymer plastics is very large, among which polystyrene foam is widely used in heat preservation, packaging of home appliances, disposable fast food boxes, etc., and is discarded as waste and garbage after being used once. Since the polystyrene foam plastics currently produced are still not naturally degradable or biodegradable, they cause white pollution to the environment. According to statistics, the amount of waste polystyrene produced by industrialized countries is almost equivalent to 50% of the annual output, most of which are discarded as garbage. In my country, especially in big cities, the number of plastic products currently used is increasing day by day, and the proportion of waste polystyrene foam plastics such as packaging boxes and disposable fast food boxes i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F257/02C08J11/10C09D151/06
CPCY02W30/62
Inventor 韩建国
Owner JIANGSU BANGJIE ANTI CORROSION THERMAL INSULATIONTECH
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